WO2012152199A1 - Air conditioning unit for heat recovery from heat pump - Google Patents

Abstract

Disclosed is an air conditioning unit for heat recovery from a heat pump, comprising an air supply box (1), air discharge boxes (2, 59), a heat pump system, and a power distribution control system. The air supply box (1) processes the fresh outdoor air and pumps it in, the air discharge boxes (2, 59) discharge the dirty indoor air outside, an evaporator (8) of the heat pump system is arranged in the air supply box (1), for cooling the air during refrigeration and switching to a condenser to heat the air during heating; a condenser (16) of the heat pump system is arranged in the air discharge boxes (2, 59), for absorbing cold energy from both indoor and outdoor air during refrigeration and switching to the evaporator to absorb heat from both indoor and outdoor air during heating, so that the cold and heat in discharged indoor air is recovered and re-used, achieving the object of energy saving.

Description

 Heat pump heat recovery air conditioning unit

 Technical field

 The invention belongs to the field of HVAC, and particularly relates to an air conditioning unit that uses a heat pump for heat energy recovery.

 Background technique

At present, the recovery of air conditioning exhaust heat energy usually adopts rotary wheel type and plate fin type, and the heat exchange efficiency is low. There is penetration and contact between exhaust air and fresh air, which pollutes fresh air and is unsanitary. In addition, such air conditioning units do not have For cold and heat sources, heat exchange equipment should be added, and a cold and heat source should be provided from the outside.

 Summary of the invention

 The object of the present invention is to provide a heat recovery air conditioning unit with reasonable structure, hygienic cleaning and sufficient energy saving.

The solution of the invention is that the heat pump heat recovery air conditioning unit is composed of a blower box, a blower box, a heat pump system and a power distribution control system. The air supply box is composed of a fresh air outlet, a return air outlet, a filter, a blower, an evaporator, an air supply port, and an additional functional section. The exhaust fan is composed of an air inlet, a fresh air outlet, a filter, a condenser, an exhaust fan, an air outlet, and an additional functional section. The heat pump system consists of a compressor, a condenser, an expansion throttle, an evaporator, and an auxiliary device. The power distribution control system is composed of power distribution equipment and automatic control equipment.

When the equipment is running, the outdoor fresh air and return air are sucked into the air supply box by the blower, and after cooling (summer) or heating (winter) of the heat pump system evaporator, the air is processed to the set parameters and sent to each through the air supply system. Air conditioning area. The indoor exhaust and the outdoor fresh air are sucked into the exhaust box by the exhaust fan, and are discharged to the outside after being heated (summer) or cooled (winter) by the condenser of the heat pump system.

When the heat pump system works in summer, because the indoor air temperature is lower than that of the outdoor, the indoor exhaust air and the outdoor fresh air are used to cool the condenser of the heat pump system in the air exhaust box, and the cooling capacity is absorbed by the condenser. In the blower box, the outdoor fresh air and the indoor return air are cooled and cooled by the evaporator of the heat pump system and sent to the air-conditioned room. In this way, the cooling capacity in the indoor exhaust air is recovered and utilized by the refrigeration cycle of the heat pump system.

When the heat pump system works in winter, the condenser of the heat pump system in the exhaust fan is converted into an evaporator. Since the indoor air temperature is higher than the outdoor, the indoor exhaust air and the outdoor fresh air are used to heat the evaporator of the heat pump system in the exhaust fan, and the heat is evaporated. Absorbed. In the blower box, the evaporator of the heat pump system is converted into a condenser, and the outdoor fresh air and the indoor return air are heated by the condenser and sent to the air-conditioned room. In this way, the heat in the indoor exhaust air is recovered and utilized by the heating cycle of the heat pump system.

The power distribution equipment of the power distribution control system provides power for the heat pump system, the blower, the exhaust fan, the electric air volume adjustment air outlet, and the automatic control equipment. The automatic control equipment automatically adjusts the heat pump system, the blower, the exhaust fan, and the electric motor according to the changes of indoor and outdoor air parameters. The air volume adjusts the operating state of the tuyere to ensure efficient and stable operation of the air conditioning unit.

 DRAWINGS

 Figure 1 is a structural diagram of a connected heat pump heat recovery air conditioning unit (1)

 Figure 2 is a structural diagram of a split heat pump heat recovery air conditioning unit

 Figure 3 is a heat pump system diagram (1)

 Figure 4 is a heat pump system diagram (2)

 Figure 5 is a heat pump system diagram (3)

 Figure 6 is a structural diagram of a heat exchanger unit for heat recovery of a heat pump (2)

 Figure 7 is a heat pump system diagram (4)

 Figure 8 is a heat pump system diagram (5)

 Figure 9 is a heat pump system diagram (6)

 Figure 10 is a heat pump system diagram (7)

 Figure 11 is a structural diagram of a heat exchanger unit for heat recovery of a heat pump (3)

 Figure 12 is a heat pump system diagram (8)

 Figure 13 is a heat pump system diagram (9)

 Figure 14 is a structural diagram of a multi-unit heat pump heat recovery air conditioning unit (1)

 Figure 15 is a heat pump system diagram (10)

 Figure 16 is a structural diagram of a multi-unit heat pump heat recovery air conditioning unit ( 2 )

 Figure 17 is a structural diagram of a multi-unit heat pump heat recovery air conditioning unit (3)

 Figure 18 is a heat pump system diagram (11)

 Figure 19 is a heat pump system diagram (12)

 Figure 20 is a heat pump system diagram ( 13 )

 Figure 21 is a heat pump system diagram ( 14 )

 Figure 22 is a heat pump system diagram ( 15 )

 Figure 23 is a heat pump system diagram ( 16 )

 Figure 24 is a heat pump system diagram ( 17 )

 Figure 25 is a heat pump system diagram ( 18 )

 Figure 26 is the construction diagram of the cylinder piston type accumulator

 Figure 27 is a diaphragm type reservoir construction diagram

 Figure 28 shows the connection between the shared reservoir and the bidirectional expansion throttle in the heat pump system ( 1 )

 Figure 29 shows the connection between the shared reservoir and the bidirectional expansion throttle valve in the heat pump system ( 2 )

 Figure 30 shows the connection between the shared reservoir and the bidirectional expansion throttle in the heat pump system (3)

 Figure 31 shows the connection between the shared reservoir and the bidirectional expansion throttle valve in the heat pump system ( 4 )

 Description of the reference signs:

 1, air supply box, 2, 59, exhaust box, 3, 14, fresh air outlet, 4, return air, 5, 15 , filter, 6, blower, 7 , partition, 8 , evaporator, 9 , 119 , 120 , 121 , 122 , refrigerant circulation pipe , 10 , humidifier , 11 , flap, 12, air supply, 13 , air inlet, 16 , condenser, 17 , compressor, 18 , 63 , 64 , electric control box , 19 , exhaust fan , 20 , exhaust vent , 21, 22, side vents, 23, oil return capillary, 24, Oil separator, 25, 98, 101, water cooler, 26, 27, four-way reversing valve, 28, 113, 129, accumulator, 29, drying filter, 30, sight glass, 31, 52, 53 , 54, 67, 72, 77, 85, 86, 87, 91, 92, 93, 97, 105, 106, expansion throttle, 32, 96, gas-liquid separator, 33, 34, 35, 36, 57 , 58, 65, 66, 68, 69, 70, 71, 73, 74, 75, 76, 89, 90, 99, 100, 102, 103, 104, 130, 131, 132, 133, Solenoid valves, 39, 40, 41, 42, 56, 81, 82, 83, 84, 94, 95, 127, 128, 134 , check valve, 43 , reheater, 37 , 38 , 44 , 45 , electric control valve , 46 , 47 , 48 , 49 , 50 , 51 , 108 , 109, 110, 111, 112, valve, 55, room air conditioner, 60, low pressure air pipe, 61, high pressure air pipe, 62, high pressure (or medium pressure) liquid pipe, 78 , mode converter, 79, outdoor unit, 80, exhaust fan, 88, commutator, 107, heat exchanger, 114, cylinder housing, 115, piston, 116, orifice tube, 117 , insulation, 118, 123, cylinder end cap, 124, tank, 125, diaphragm, 126, grille

 Specific implementation

 Figure 1 is a structural diagram of a connected heat pump heat recovery air conditioning unit, which is provided by a blower box 1 and a blower box 2 The heat pump system and the power distribution control system are composed of four parts.

 The box body is made of steel plate and other materials, and is insulated with a heat insulating material such as polyurethane. An inspection door is provided on the cabinet to facilitate access and maintenance of the personnel. Air supply box 1 Disconnected from the exhaust box 2 by the partition 7 and placed with insulation material to prevent hurricane and heat exchange between fresh air and exhaust air. Air supply box 1 , air exhaust box 2 Can be made in one piece, the required equipment is installed in a complete box, the integrated air conditioning unit is not convenient to transport, install and repair, but saves materials; can also be made into a segmented combination, with different functions The equipment is placed in several functional sections, and is made into a number of small boxes, which are assembled into a whole after being on the scene. For example: air box In 1 , the fresh air outlet 3, the return air outlet 4, and the filter 5 are made into the inlet air mixing filter section, and so on, and can be made into a blower section, an evaporator section, and a humidifying and blowing section. Air exhaust box 2 It can be made into the inlet air mixing filter section, the condenser section, the heat pump main unit, the electric control box section and the exhaust fan section. Each section can be disassembled for easy transportation, installation and overhaul. Air supply box 1 , air exhaust box 2 Other functional sections may be added as needed, such as an additional electric heating section, an air disinfection section, an anechoic section, an inspection section, and the like.

 The main part of the heat pump system (compressor 17 and other equipment) can be placed in the box or outside the box, evaporator 8 and condenser 16 The equipment such as the refrigerant circulation pipe 9 is located in the casing. Evaporator 8 , condenser 16 A heat exchanger in the form of a straight-expanded structural coil is used to ensure that the refrigerant evaporates and condenses therein, and the heat exchanger is made of a copper tube and an aluminum fin.

 Electrical control box for distribution control system 18 It is equipped with controller, display, power distribution equipment, etc., which can be hung outside the box, or embedded in the box, or separated from the box. Various power distribution and control equipment and pipelines are distributed in the box. Crossing the partition 7 All kinds of pipelines should be sealed to prevent air leakage.

 During the summer equipment operation, in the air supply box 1, the outdoor high temperature and high humidity fresh air and indoor return air are under the action of the blower 6, from the fresh air outlet 3 And the return air inlet 4 enters the box, mixes and is filtered by the filter 5, filtered by the filter 5, passed through the blower 6 , cooled by the evaporator 8 , cooled and dehumidified, after reaching the set temperature and humidity, from the air supply port 12 It is sent to the air-conditioning area; in the air exhaust box 2, the outdoor fresh air and the indoor exhaust air enter the tank from the air inlet 13 and the fresh air outlet 14 under the action of the exhaust fan 19, and are mixed by the filter 15 The dust removal filter is heated by the condenser 16, heated, and discharged to the outside through the exhaust fan 19 and the exhaust port 20. At this time, the heat pump system performs a refrigeration cycle, and in the blower box 1, the evaporator 8 The heat is evaporated and the air is cooled and dehumidified. In the exhaust box 2, the condenser 16 is cooled by the indoor and outdoor air, and the cooling capacity in the indoor exhaust is recycled.

 When the winter equipment is working, in the air supply box 1, the outdoor low temperature fresh air and the indoor return air are under the action of the blower 6, from the fresh air outlet 3 and the return air outlet. 4 Enter the box, mix and filter by dust filter 5, pass the blower 6 and pass the evaporator 8 to heat up. If the humidity is low, humidifier 10 is needed to humidify. After reaching the set temperature and humidity, pass the water retaining plate. 11 From the air supply port 12 to the air conditioning area; in the air exhaust box 2, the outdoor fresh air and the indoor exhaust air are driven by the exhaust fan 19, enter the box from the air inlet 13 and the fresh air outlet 14, and are mixed by the filter. 15 Dust filtration, through the condenser 16, is cooled and cooled, and then discharged to the outdoor through the exhaust fan 19 and the exhaust vent 20. At this point, the heat pump system performs a heating cycle, and the system is converted in the blower box 1 In the middle, the evaporator 8 is converted into a condenser, and the air is heated and heated. In the exhaust box 2, the condenser 16 is converted into an evaporator to absorb heat, and the heat in the indoor exhaust is recycled.

 During the transitional season, the heat pump system stops running, and the return air outlet 4 in the air supply box 1 is closed, and the fresh air outlet 3 and the air supply port 12 Open, blower 6 operation; fresh air outlet in the air exhaust box 2 14 closed, air inlet 13 , side air vent 21 , air vent 20 open, exhaust fan 19 Operation, air conditioning unit for new wind operation. The side vent 21 is connected to the indoor exhaust air like the air inlet 13 to reduce the exhaust resistance caused by the condenser 16 and reduce the power consumption of the exhaust fan 19.

 When the equipment is running, the power distribution equipment of the power distribution control system is the heat pump system, the blower 6 , and the exhaust fan 19 The electric air volume adjustment air outlet and the automatic control system provide power. The heat pump system is a variable capacity system, the compressor 17 is a variable capacity compressor, the blower 6 and the exhaust fan 19 are frequency conversion speed control fans, and the fresh air outlets 3, 14 , return air inlet 4, air inlet 13 for electric air volume adjustment air outlet, manual or electric dual-purpose air volume adjustment air outlet, side air vent 21 It is not commonly used, it can be set as manual air outlet, or it can be set as manual and electric dual-purpose air volume adjustment air outlet. The automatic control device controls the compressor according to changes in indoor and outdoor air parameters. The amount of exhaust gas, automatically adjusts the cooling capacity or heating capacity of the heat pump system, controls the blower 6 and exhaust fan 19 The speed of rotation and the opening of each tuyere automatically adjust the air volume to ensure efficient and stable operation of the air conditioning unit. The automatic control system has controllers, displays, sensors, actuators, etc., usually using microcomputer control (such as PLC Controller), with autonomous setting parameters, fault detection, automatic alarm and other functions, can be controlled by the touch screen on-site, remote control through computer keyboard, mouse, and network control through LAN, Internet.

 In the winter, when the outdoor temperature is low, the indoor fresh air demand is small, and there is no indoor exhaust, the heat pump system has low working efficiency, and even cannot be started. 1 Set the electric heater to directly heat the fresh air without starting the heat pump system, or set the electric heater in the exhaust box 2 to heat the fresh air, then start the heat pump system, and the electric heater can be used for defrost.

 As shown in Figure 1, the blower box 1 is located below the bellows 2, and the blower box 1 can also be placed. The top of the exhaust box 2. During summer operation, the evaporator 8 generates a large amount of low-temperature condensed water. In order to save energy, this part of the low-temperature condensed water can be sprayed into the exhaust box 2 by gravity gravity or water pump pressure for cooling exhaust or condensation. 16. A condensate collecting pan is placed under the evaporator 8 and the condenser 16, and the condensed water is collected and discharged to the outside of the tank. Air supply box 1 , The air exhaust box 2 can be placed indoors or placed outdoors, such as on the roof, to reduce the floor space. In addition, the direction of the intake and exhaust and the position of the tuyere can also be adjusted as needed.

 In the above device, the air supply box 1 has a return air inlet 4 It can handle indoor return air. The unit is suitable for all air conditioning systems and variable air volume air conditioning systems, such as large shopping malls and office buildings. When there is no return air outlet 4 At the time, the equipment is a brand-new air-conditioning unit, and the air supply is fresh air, clean and sanitary, and is suitable for hotels and hospitals with high air hygiene standards.

 Figure 2 is a structural diagram of a split heat pump heat recovery air conditioning unit, the air supply box 1 and The exhaust fan box 2 is separated, and when the device is shipped from the factory, the refrigerant circulation pipe 9 connected to the main body of the heat pump system by the evaporator 8 or the condenser 16 is disconnected and sealed, and various types of lines connected to the electric control box 18 are also disconnected. When the site is installed, the refrigerant circulation pipe 9 is connected through the quick joint, and various types of lines are connected to the electric control box 18. Although the pipeline and the line are increased, the normal operation of the unit can be ensured. The two cabinets can be placed in different positions according to the needs of the user, and the arrangement is more flexible. For example, the air exhaust box 2 can be placed on the roof to save floor space and reduce the noise of the unit. An air supply vent 22 can be added to the air supply box 1 to reduce the air supply resistance.

 Figure 3 is a diagram of the heat pump system of the above heat pump heat recovery air conditioning unit, which is a refrigeration cycle. The refrigerant cycle process is this: compressor 17 → Oil separator 24 → water cooler 25 → four-way switching valve 26 → condenser 16 → four-way switching valve 27 → accumulator 28 → drying filter 29 → sight glass 30 → expansion throttle 31 → four Through the reversing valve 27 → evaporator 8 → four-way reversing valve 26 → gas-liquid separator 32 → Compressor 17 . The high-pressure, high-temperature gaseous refrigerant discharged from the compressor 17 is separated from the lubricating oil in the oil separator 24, and the lubricating oil is returned to the compressor through the oil return capillary 23 The lubricant can also be reflowed by other means. In the summer, tap water enters The water cooler 25 absorbs the heat of the high-temperature refrigerant and becomes hot water, which can provide customers with domestic hot water and save fuel costs. At the same time, since the heat of the refrigerant is absorbed by the tap water, the amount of fresh air for condensing the refrigerant can be reduced, and the power consumption of the exhaust fan 19 is lowered. When the customer does not need domestic hot water, the water cooler 25 can be cancelled or turned off, and the heat of the refrigerant is exhausted by the indoor exhaust air and the outdoor fresh air. The water cooler 25 can be in the form of a spiral tube type, a shell tube type, a sleeve type or the like, and a closed type pressurized container or an open type pressureless container is used. Compressor 17 The closer the exhaust port is, the better the heat recovery effect. image 3 The medium water cooler 25 is connected in series on the refrigerant pipe. Since the refrigerant is uncontrollable, the water temperature in the water cooler 25 is also difficult to control, and it is preferably used as a water supply preheater for the internal hot water system of the building. The expansion restrictor 31 usually employs an electronic expansion valve to adjust the flow rate of the refrigerant relatively quickly and accurately, and other expansion restrictors, such as capillary tubes, can be used for small systems. The compressor 17 employs a variable capacity compressor such as a variable frequency rotor type, a scroll type, or a screw type compressor. When the system cooling capacity and the heating capacity change, the compressor 17 also changes the capacity output in time to achieve energy-saving operation. when There are multiple compressors in the heat pump system. 17 When operating in parallel, the compressor 17 All of the fixed capacity compressors, or all of the variable capacity compressors, or a combination of variable capacity compressors and fixed capacity compressors, can achieve variable capacity operation. To achieve the purpose of energy saving. In addition, in the heat pump system, in addition to the oil return capillary 23, In addition to the auxiliary devices such as the oil separator 24, the four-way switching valve 26, 27, the accumulator 28, the drying filter 29, the sight glass 30, and the gas-liquid separator 32, other auxiliary equipment such as heat recovery is provided. , recooler, temperature, pressure sensor, etc. The automatic control system automatically adjusts the operating status of the system according to changes in system temperature and pressure, and maintains efficient operation of the heat pump system.

 In the winter, the heat pump system performs a heating cycle, after the four-way switching valves 26, 27 are turned, the evaporator 8 becomes a condenser, and the condenser 16 becomes an evaporator. The refrigerant cycle process is this: compressor 17 → Oil separator 24 → water cooler 25 → four-way switching valve 26 → evaporator 8 → four-way switching valve 27 → accumulator 28 → drying filter 29 → sight glass 30 → expansion throttle 31 → four Through the reversing valve 27 → condenser 16 → four-way reversing valve 26 → gas-liquid separator 32 → Compressor 17 . in winter, The water cooler 25 stops working, does not produce hot water, the refrigerant dissipates heat in the evaporator 8, and is used to heat the outdoor fresh air, and absorbs heat in the condenser 16, absorbs the heat of the indoor exhaust air and the outdoor fresh air, and recycles the indoor Exhaust heat. If the water cooler 25 can also produce hot water in winter, it is necessary to increase the system capacity and increase the heat generation, such as increasing the power of the compressor 17, increasing the amount of fresh air outside the exhaust box 2, and the amount of exhaust air of the exhaust fan 19. . In the winter, the water cooler 25 is suitable for use in the south, while in the north, the outdoor temperature is low, and when the water cooler 25 is in operation, The heat pump system is inefficient. The apparatus with the water cooler 25 described above may also be referred to as a hot water type heat pump heat recovery air conditioning unit.

 In the heat pump system shown in Figure 4, solenoid valves 33, 34, 35, 36 replace the heat pump system described above. Four-way reversing valve 27. When the solenoid valves 33, 34 are opened and the solenoid valves 35, 36 are closed, the system performs a refrigeration cycle; when the solenoid valves 33, 34 are closed, the solenoid valves 35, 36 When turned on, the system performs a heating cycle. When the outdoor temperature in winter is low and the indoor exhaust air volume is small, the heat pump system performs a heating cycle, and the condenser 16 acts as an evaporator to easily frost, in order to melt the frost, The water cooler 25 stops the output of the hot water, but the hot water is supplied to the water cooler 25 by an external heat source (boiler, electric heat, etc.), and the water cooler 25 becomes a water heater to supply heat for the refrigerant to evaporate. When defrosting, open the air inlet of the bellows 2 13、Close the fresh air outlet 14 , open the electric control valve 37, close the electric control valve 38, and use the indoor exhaust air to melt the frost. At this time, it does not affect the normal operation of the air conditioning system.

 In the heat pump system shown in Figure 5, check valves 39, 40, 41, 42 replace the heat pump system described above. The four-way reversing valve 27 and the solenoid valves 33, 34, 35, 36 can also be combined with a solenoid valve. When the system performs a refrigeration cycle, the check valves 39, 40 are open, and the check valve 41, 42 OFF; when the system performs the heating cycle, the check valves 39, 40 are closed and the check valves 41, 42 are open. When defrosting, input hot water to the water cooler 25, open the air exhaust box 2 Air inlet 13 , close the fresh air port 14 , open the electric control valve 37 , close the electric control valve 38 , use the indoor exhaust air to defrost . The water cooler 25 can be used as a regenerative container, filled with a heat storage material, and stored in the building waste heat for defrosting and heating the hot water.

 Figure 6 is a structural diagram of another type of heat pump heat recovery air conditioning unit, which differs from the above air conditioning unit in that a reheater is added to the air supply box 1. 43. When the air is cooled by the evaporator 8 and then cooled, it is reheated. Heating can increase the air supply temperature, reduce the air supply temperature difference, improve the air conditioning comfort, and is suitable for air conditioning with high air conditioning precision and humidity. The device can also be constructed as a split heat pump heat recovery air conditioning unit as shown in Figure 2.

 Figure 7 is a diagram of the heat pump system of the apparatus shown in Figure 6. The reheater 43 is connected in parallel with the condenser 16 in the system, and the electric control valve 44 45, according to the load change situation, adjust the refrigerant flow into the reheater 43, the condenser 16, when the winter heating cycle, the electric control valve 44 is closed, the reheater 43 does not work. Electric control valve 44, 45 One of them can be assigned to a solenoid valve to distribute the refrigerant flow. The reheater 43 is constructed in the same manner as the evaporator 8 and the condenser 16. The device with reheater 43 described above can also be called Reheat heat pump heat recovery air conditioning unit.

 Figure 8 is a heat pump system diagram of another reheat heat pump heat recovery air conditioning unit, shown in the refrigeration cycle, valves 46, 49, 50 Open, valves 47, 48, 51 are closed. It and Figure 7 The difference is that the reheater 43 can be converted into an evaporator. When the evaporator 8 is inoperable, the valves 46, 49, 50, the electric regulating valve 44 are closed, and the reheater 43 is used as a backup. When cooling, close valve 48 and open the valve 47, 51, the reheater 43 is converted into an evaporator; when heating, the valve 47 is closed, the valves 48, 51 are opened, and the reheater 43 is converted into a condenser.

 In the heat pump system shown in Figure 9, solenoid valves 33, 34, 35, 36 replace the heat pump system of Figure 8. Four-way reversing valve 27.

 In the heat pump system shown in Figure 10, the check valves 39, 40, 41, 42 replace the heat pump system of Figure 8. Four-way reversing valve 27.

 Figure 11 is another conjoined The heat pump heat recovery air conditioning unit structure diagram, which differs from the above air conditioning unit in that there are two sets of refrigeration systems. One of them is a heat pump system for cooling or heating the air; the other is a single cooling system for reheating the cooled air. The system can also be used as a heat pump system for both reheating and cooling. It is a backup to the former, and although the equipment is added, the reliability is improved. The device can also be made into a picture 2 The split heat pump heat recovery air conditioning unit shown. The above equipment can also be called a two-machine heat pump heat recovery air conditioning unit.

 Figure 12 is a heat pump system diagram of a multi-unit heat pump heat recovery air conditioning unit, showing a refrigeration cycle. Two compressors 17 are operated in parallel, and the refrigerant can flow in both directions in the expansion restrictors 52, 53, 54. The condenser 16 is housed in the exhaust box 2, and the evaporator 8 is installed in the blower box 1. It has a bellows 2 and condenser 16 , can connect two and several air blowers 1 and evaporator 8 , and other equipment. Only the two air blowers 1 and evaporator 8 and one room air conditioner are shown in Figure 12 . , a water cooler 25 . Room air conditioner 55 Housed in an air-conditioned room, it uses a heat exchanger in the form of a straight-expanded structural coil, made of copper tubing and aluminum fins, which rely on direct evaporation or condensation of the refrigerant to circulate cooling or heat the air in the room. With air box 1 and air box 2 Different, it can be called the system's additional equipment, or the end equipment, there are other additional equipment that uses the refrigerant to cool or heat, such as: the bathroom's hand dryer, can use the condensation heat of the refrigerant; use the building's sewage, Equipment for cooling refrigerant in the summer, heating the refrigerant in the winter; equipment for heating the refrigerant by using the kitchen fumes, waste heat of washing the waste water; equipment for heating the refrigerant by using the solar hot water or the hot air. In the blower box 1 In the air-conditioned area served, when there are enough additional devices such as room air conditioners 55, the air supply box 1 does not have a return air outlet 4 or closes the air return port 4 and only sends fresh air. Water cooler 25 Parallel in the system, when the water temperature reaches the set temperature, the solenoid valve 57 is closed, the high temperature refrigerant is turned off, the solenoid valve 58 is opened, the high temperature refrigerant is passed, and the solenoid valves 57, 58 It can also be changed to an electric control valve to allow the refrigerant to pass through the two valves in proportion. The exhaust fan 2 is usually placed outdoors, called an outdoor unit (since the exhaust box 2 can be placed indoors, it can also be called an indoor unit), and the indoor exhaust is concentrated to the exhaust box. 2 in. For large units, two or more exhaust ducts 2 and condensers 16 can be made, and several air blowers 1 and evaporators 8, additional equipment, water coolers 25 and other indoor units, water coolers 25 can be connected. It can also be placed outdoors, called an outdoor unit. In the above-mentioned equipment, the operating conditions of several evaporators 8 are the same, either cooling or heating, and therefore, it can be called the same-type heat pump system.

 Figure 13 is a heat pump system diagram of another multi-heat pump heat recovery air conditioning unit, which adds a reheater to the air supply box 1 And a water cooler 25 is provided in parallel with the condenser 16 in the system, and the electric flow regulating valve 44 is used to regulate the refrigerant flow. In this device, the evaporator 8 and the room air conditioner in the two blower boxes 1 are 55 It can be cooled at the same time and heated at the same time. The two blower boxes 1 can also be heated one by one while the other is refrigerated, wherein the reheater 43 in the cooled blower box 1 is converted into an evaporator for cooling, Evaporator in the same box 8 Not working.

 Figure 14 is a structural diagram of a multi-unit heat pump heat recovery air conditioning unit. The air exhaust box 2 is placed outdoors, the air inlet 13 and the side air vent 21 When the indoor air is exhausted, the condenser 16 can also be converted into an evaporator to absorb the indoor heat and the cold heat in the outdoor fresh air. The compressor 17 is placed in the box body and can also be placed outside the box. For a large-capacity air conditioning system, Multiple air vents can be set 2 Parallel use; the exhaust fan 59 is different from the above-mentioned exhaust fan 2, it does not have a compressor 17, fresh air outlet 14, only handles indoor exhaust, condenser 16 It can also be converted into an evaporator to recover the cold heat in the indoor exhaust air. It is installed indoors, and can be made into a unitary or air-cooled box 1 that serves the same air-conditioned area. Figure 14 The middle part is split type, so that the arrangement is more flexible and convenient; in the air supply box 1, the evaporator 8 can also be converted into a condenser, and the reheater 43 can also be converted into an evaporator or a condenser. Air exhaust box 2, 59, The blower box 1, the room air conditioner 55, and the water cooler 25 are connected to the low pressure air pipe 60, the high pressure air pipe 61, and the high pressure (or medium pressure) liquid pipe 62. The water cooler 25 is placed outdoors, which is a heat-insulated pressurized container equipped with a refrigerant radiator. The multi-connected heat pump heat recovery air conditioning unit can be referred to as a reheat type or a water-cooled type. The heat pump system in the figure only shows the connection of three indoor units ( Supply air box 1, exhaust air box 59, room air conditioner 55), two outdoor units (air exhaust box 2, water cooler 25 ), it can connect several indoor and outdoor units. When the air-conditioned area has a large exhaust duct that is discharged to the outside, the air exhaust box 59 may not be provided, and the indoor exhaust air is all connected to the air exhaust box 2.

 Figure 15 is a heat pump system diagram of the multi-unit heat pump heat recovery air conditioning unit shown in Figure 14. Solenoid box 2 solenoid valve 65 open, solenoid valve 66 Shutdown, condenser 16 heating; solenoid valve 65 closed, solenoid valve 66 open, condenser 16 cooled. Solenoid valve 68 opens, high temperature refrigerant passes The water cooler 25 heats the water, and when the water temperature reaches the set temperature, the solenoid valve 68 is closed. When the condenser 16 needs to be defrost, the solenoid valve 68 is closed and the solenoid valve 69 is opened. The water cooler 25 is converted into a water heater to which a heat source is supplied from the outside. In the exhaust fan 59, the solenoid valve 70 is open, the solenoid valve 71 is closed, the condenser 16 is heating, the solenoid valve 71 is open, and the solenoid valve is 70 Shut down, condenser 16 is cooled. The blower box 1 has a reheater 43 which controls the flow rate of the refrigerant, and controls the solenoid valves 73, 74 and the reheater 43. It can also be converted to an evaporator or condenser for use with the evaporator 8 for backup. If you do not need to convert to an evaporator, use only the reheater, you can cancel the solenoid valve 73, 74, The expansion restrictor 77 and the drying filter 29 are arranged as shown in Fig. 7, and an electric regulating valve 44 is provided. The reheater 43 is connected to the high pressure gas pipe 61 and the high pressure (or medium pressure) liquid pipe 62. Solenoid valve 73 When the solenoid valve 74 is closed, the reheater 43 is heated; the solenoid valve 73 is closed, the solenoid valve 74 is opened, and the reheater 43 is cooled. Solenoid valve 76 open, solenoid valve 75 closed, evaporator 8 Cooling; solenoid valve 76 is closed, solenoid valve 75 is open, and evaporator 8 is heated. Mode Converter 78 Controls the conversion of room air conditioners 55 to cooling and heating conditions.

 The system shown in Figure 15 is a three-control system, evaporator 8, reheater 43, condenser 16 and room air conditioner 55. Water cooler 25 and low pressure air pipe 60, high pressure gas pipe 61, high pressure (or medium pressure) liquid pipe 62 Connected, the system has three operating conditions: simultaneous cooling, simultaneous heating, or a part of the cabinet while cooling, while other cabinets are heating. Assume that the system is heating cycle in winter, the air supply box 1 sends cold air, and the evaporator 8 Refrigeration, reheater 43 heating; room air conditioner 55 heating, it is not in an air conditioning area with the air supply box 1; the air exhaust box 59 absorbs heat, the condenser 16 is cooled; the water cooler 25 heats; 2 Endothermic, where the condenser 16 is cooled (whether it is cooling or heating, it needs to be executed by the operation and judgment of the automatic control system). Therefore, during the above refrigerant cycle, The amount of cold absorbed by the room air conditioner 55, the water cooler 25, and the reheater 43 is transmitted to the evaporator 8, the condenser 16, and the heat absorbed by the evaporator 8 and the condenser 16 is transferred to the heat. Room air conditioner 55, water cooler 25, reheater 43.

Therefore, by controlling the opening and closing of the solenoid valve and the conversion of the mode converter, the transformation of the operating conditions of each unit can be realized, which can meet the requirements of simultaneous cooling and heating of different air-conditioned places, and the cold heat of different air-conditioned places can be recycled to each other. Utilization, the total amount of recycling is increased, and energy saving is remarkable. Multi-junction heat pump systems are also known as heat recovery heat pump systems. For example, in the office building with a deeper depth, in the winter, the outer zone needs to send hot air, and the inner zone needs to send cold air. This equipment can meet the requirements.

 Figure 16 is a structural diagram of another multi-unit heat pump heat recovery air conditioning unit, a set of air supply boxes 1 and air exhaust boxes 2 placed outdoors (also indoors) The heat pump system has more than three room air conditioners 55, which are three-regulated heat recovery type heat pump systems.

 Figure 17 is a structural diagram of another multi-heat pump heat recovery air conditioning unit, which replaces the outdoor unit exhaust box 2 in Figure 14 with an outdoor unit. 79. It is composed of a condenser 16, an exhaust fan 80, a compressor 17, a refrigerant circulation pipe 9, a refrigeration system auxiliary device, an electric control box 18, and the like, and an outdoor unit 79 Without indoor exhaust, the outdoor air is cooled or heated by the exhaust fan 80, and the heat energy of the indoor exhaust is recovered by the indoor unit exhaust fan 59 Responsible, the unit is suitable for indoor air ducts that are inconvenient to lead out to the outside, or where there is no indoor exhaust.

 Figure 18 is a heat pump system diagram of a multi-unit heat pump heat recovery air conditioning unit, including a condenser 16 of the outdoor exhaust box 2, and an indoor exhaust box The condenser 16 of 59, the evaporator 8 of the blower 1 and the reheater 43, the room air conditioner 55, and the water cooler 25. The system is undergoing a heating cycle, the reheater 43 The room air conditioner 55, the water cooler 25 are heating, the condenser 16 and the evaporator 8 are being cooled, and the heat is transferred to the room air conditioner 55 by the evaporator 8 through the circulation. In the air-conditioned area served, the internal heat is recycled. This system is also called heat recovery type. The heat pump system, unlike the three control systems described above, is a two-control system that connects multiple units through a gas line and a high pressure liquid line.

 The heat pump system shown in Figure 19 is undergoing a refrigeration cycle, and the electronic expansion throttle valve 91 is open, 92 When the heating cycle is performed, the electronic expansion throttle valve 91 is closed and 92 is opened. In the gas-liquid separator 96, the high-pressure liquid refrigerant exchanges heat with the low-temperature gas refrigerant, which can save energy, and the compressor 17 is screwed. In the rod compressor, a part of the high-pressure liquid refrigerant is throttled by the electronic expansion throttle valve 93, and then lowered into a low-pressure low-temperature liquid, which is injected into the compressor 17 chamber for cooling.

 The heat pump system shown in Fig. 20 is undergoing a heating cycle, and the expansion restrictor 97 is a two-way valve, and the accumulator 28 and the water cooler 98 are eliminated. It can be used as a liquid storage device in which high-temperature and high-pressure gas refrigerant is cooled into liquid refrigerant by cooling water (or cold air). When it is necessary to store or use refrigerant, solenoid valve 99 is opened, 100 is closed, and vice versa, solenoid valve is used. 99 closed, 100 open, solenoid valve 99, 100 can be used electric throttle valve or electric three-way control valve, water cooler 98 should use spiral tube, shell and tube heat exchanger. If you cancel the dedicated reservoir, Excess refrigerant can be stored in evaporator 8, condenser 16 or piping, and the evaporator 8 and condenser 16 can be enlarged. The size of the bottom coil or the size of the header is reserved for the condensed liquid refrigerant, which simplifies the system.

 The heat pump system shown in Fig. 21 is undergoing a heating cycle, and a reservoir 28 is connected behind the water cooler 101. The high temperature and high pressure gaseous refrigerant is cooled by the cooling water (or cold air) into a liquid refrigerant in the water cooler 101, and then flows into the accumulator 28, and the low temperature gaseous refrigerant from the evaporator 8 or the condenser 16 passes through the solenoid valve. 102 Entering the water cooler 101, it is also possible to cool the high temperature and high pressure gaseous refrigerant. The water cooler 101 should adopt a double spiral tube heat exchanger, and the solenoid valve 102, 103 An electric control valve or an electric three-way control valve can be used.

 The heat pump system shown in Fig. 22 is in a refrigeration cycle, the expansion throttle 97 is a two-way valve, and the compressor 17 is a screw. The rod type compressor opens the solenoid valve 104, and a part of the high-pressure liquid refrigerant is throttled by the capillary expansion throttle valve 105, and then lowered into a low-pressure low-temperature liquid, which is injected into the compressor 17 chamber for cooling.

 The heat pump system shown in Fig. 23 is undergoing a heating cycle, and the compressor 17 is qi. The scroll compressor opens an air-filling expansion throttle 106 in an outdoor low-temperature environment, and a part of the high-pressure liquid refrigerant is throttled as a low-pressure low-temperature liquid refrigerant, and then vaporized and vaporized by the heat exchanger 107 to enter the compressor. 17 In the air supply chamber, the operating condition of the compressor 17 is improved, and the heating capacity is increased.

 The heat pump system shown in Fig. 24 is undergoing a refrigeration cycle, which is the same as that shown in Figs. 8, 9, and 10. The heat pump system has the same function, but the system is simplified by the use of the bi-directional expansion restrictor 97. The reheater 43 can be used not only as a condenser or an evaporator, but also as a reservoir, valves 108, 109 , 110, 111, 112 can use solenoid valves.

 The heat pump system shown in Fig. 25 is undergoing a refrigeration cycle with a cylinder piston type accumulator 113. The structure and working principle are shown in Fig. 28. .

 Figure 26 is a structural view of a cylinder piston type reservoir, which is composed of a cylinder housing 114, a piston 115, a cylinder end cover 118, 123, a refrigerant circulation pipe 119, 120, 121, 122, etc., which is installed in the refrigerant circulation line between the evaporator 8 and the condenser 16, the refrigerant circulation pipe 119, 122 is connected to the drying filter 29, and then connected to the evaporator 8 and the condenser 16, respectively, and the refrigerant circulation pipes 120 and 121 are connected to the bidirectional expansion restrictor 97, and the refrigerant circulation pipe is connected. 119, 120, 121, 122 are connected to the cylinder end caps 118, 123, respectively, communicating with the cylinder, the piston 115 It can slide inside the cylinder. When the system performs a refrigeration cycle, the high pressure liquid refrigerant from the condenser 16 passes through the refrigerant circulation pipe 122 from the cylinder end cap 123. Into the cylinder, most of the high pressure liquid refrigerant enters the bidirectional expansion restrictor 97 through the refrigerant circulation pipe 121, is throttled into a low pressure liquid refrigerant, passes through the refrigerant circulation pipe 120, and from the cylinder end cover 118. It flows back to the cylinder and finally flows out of the cylinder through the refrigerant circulation pipe 119 to the drying filter 29 and the evaporator 8. Since one end of the cylinder is a high-pressure liquid refrigerant, the other end is a low-pressure liquid refrigerant, in the piston 115 A differential pressure is formed on both sides to push the piston 115 from the high pressure end to the low pressure end. In the figure, it moves from right to left, up to the cylinder end cap 118, on the left side of the piston 115 and the cylinder end cap 118 A narrow cavity space is formed to ensure the circulation of the low-pressure liquid refrigerant. This narrow space should ensure that the refrigerant does not evaporate and vaporize, but on the right side of the piston 115 and the cylinder end cap 123 A large cavity space is formed between them to ensure the circulation and storage of the high-pressure liquid refrigerant. The piston 115 has an orifice tube 116 and a small amount of high pressure liquid refrigerant can be supplied from the orifice tube 116 Throttle to the low pressure side, there is also a small amount of high pressure liquid refrigerant throttling from the clearance between the piston 115 and the cylinder wall to the low pressure side. When the system is running at low load, the expansion throttle 97 is closed, and the system relies on the orifice tube 116 throttling operation, or without orifice 170, the system relies entirely on the expansion throttle 97. Orifice tube 116 The ends can be bent with a small tube, which can be made of elastic material, and a heavy object is placed at the mouth to keep it hanging forever, and extends below the liquid level of the refrigerant to ensure liquid cooling at the bottom. The agent is throttled. In the piston 115 There is insulation layer 117 in it to reduce heat transfer. When the system performs the heating cycle, the refrigerant flows in the reverse direction, the left side of the piston 115 becomes the high pressure side, and the right side becomes the low pressure side, which is pushed to the right end, and the top end to the cylinder end cap 123 The excess high pressure liquid refrigerant is then stored in the cylinder on the left side of the piston 115.

 Figure 27 is a structural view of the diaphragm type reservoir, which is composed of a can body 124, a diaphragm 125, an orifice tube 116, and a refrigerant circulation tube. 119, 120, 121, 122, etc. The diaphragm 125 is a flexible material with high elasticity, high strength and no leakage, which is located in the tank 124 The center is divided into two separate spaces. When the system is shut down and the pressure is balanced, the diaphragm 125 is in a relaxed state of any shape. A refrigerant circulation pipe 119 is connected to a lower portion of the can body 124, 120, 121, 122, the refrigerant circulation pipe 119, 120 is connected to the left space of the diaphragm 125, and the refrigerant circulation pipes 121, 122 and the diaphragm 125 The space on the right side is connected, and the orifice tube 116 connects the spaces on both sides of the diaphragm 125. When the refrigerant circulation pipes 121, 122 are connected to the high pressure end, the diaphragm 125 extends or expands to the left, close to the tank body. The inner wall of 124 forms a large space on the right side, in which the high-pressure liquid refrigerant circulates, and the excess portion is stored therein. At this time, the refrigerant circulation pipe 119, 120 Connected to the low pressure end, the throttled refrigerant circulates in a narrow space at the bottom of the diaphragm 125. This narrow space should ensure that the refrigerant does not evaporate and vaporize; conversely, the refrigerant flows in the opposite direction and the diaphragm 125 expands to the right. Grille 126 prevents the diaphragm 125 from extending downward to prevent clogging of the refrigerant circulation tube nozzle.

 In Figure 28, two reservoirs 28 are provided. When the right side of the bidirectional expansion restrictor 97 is the high pressure side and the left side is the low pressure side, the right side reservoir is used. 28 Store the high pressure liquid refrigerant. The reservoir 28 on the left is not used. Otherwise, use the reservoir 28 on the left and the right side is not used. The check valve in the figure can also be replaced by a solenoid valve.

 The shared reservoir 129 in Figure 29 is located in the bi-directional expansion restrictor 97 Above, when the right side is the high pressure end and the left side is the low pressure end, the right side solenoid valve 130 is opened, the left side solenoid valve is closed, and the accumulator 129 stores the right side high pressure liquid refrigerant, and vice versa, the left side solenoid valve 130 Open, the solenoid valve on the right side is closed, and the reservoir 129 stores the high pressure liquid refrigerant on the left side.

 In Fig. 30, when the right side of the bidirectional expansion throttle valve 97 is the high pressure end and the left side is the low pressure end, the right side solenoid valves 132, 133 are opened, 131 Closed, left solenoid valve 132, 133 closed, 131 open, shared reservoir 28 Stores the high pressure liquid refrigerant on the right side, otherwise the left solenoid valves 132, 133 open, 131 Closed, right solenoid valve 132, 133 closed, 131 open, shared reservoir 28 Store the high pressure liquid refrigerant on the left side.

 In Fig. 31, when the right side of the bidirectional expansion restrictor 97 is the high pressure end and the left side is the low pressure end, the right side solenoid valve 133 is opened, and the left side solenoid valve is opened. 133 Close, share the reservoir 28 Store the high pressure liquid refrigerant on the right side. Otherwise, the left solenoid valve 133 opens, the right solenoid valve 133 closes, and the common reservoir 28 Store the high pressure liquid refrigerant on the left side.

In summary, the air supply box, the exhaust fan box, the heat pump system main unit, and the water cooler can be placed indoors or outside; the air supply box can be brought back to the air outlet or without the return air outlet; the exhaust air box can be carried The new air outlet can also be equipped with no fresh air outlets; the multi-unit unit can carry multiple indoor units and outdoor units; the water cooler can be connected in series or in parallel on the high-pressure air pipe or across the refrigerant circulation pipe, and it can also be converted into The water heater provides a heat source for the heat pump system for defrost operation. It can also be used as a liquid reservoir to store excess liquid refrigerant. The expansion throttle can use a two-way valve or a check valve. The two-way valve makes the heat pump system more simplify.

The above description is only a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, equivalent changes, and modifications made to the above embodiments in accordance with the technical spirit of the present invention are within the scope of the present invention.

Claims (11)

1. Heat pump heat recovery air conditioning unit, which is composed of air supply box, exhaust air box, heat pump system and power distribution control system. The air supply box has fresh air outlet, return air outlet, air supply port, evaporator, blower, filter, Additional functional section; the exhaust box has an air inlet, a fresh air outlet, an air outlet, a condenser, an exhaust fan, a filter, and an additional functional section; the heat pump system is a compressor, a condenser, an expansion throttle, an evaporator, Auxiliary device, refrigerant circulation pipe, refrigerant composition; power distribution control system is composed of power distribution equipment and automatic control equipment, which is characterized in that the fresh air outlet is connected to the outdoor air, the return air inlet is connected to the indoor return air, and the air supply port is connected to the indoor air conditioning system. Air supply duct, the air inlet is connected to the indoor air exhaust, and the air outlet is connected to the outdoor air; the outdoor fresh air and the indoor return air are sucked into the air supply box by the blower, and processed by the filter, the evaporator and the additional functional section to reach the set air conditioning parameter. After that, it is sent to the air-conditioning area through the air supply port; the outdoor fresh air and the indoor exhaust air are sucked into the air exhaust box by the exhaust fan, and after passing through the filter, the condenser, and the additional functional section, the air outlet is passed through the air outlet. To the outside; the air supply box and the exhaust air box are integral or sectional, and the air supply box and the air exhaust box are sealed and sealed; the evaporator of the heat pump system is installed in the air supply box, during cooling It is used to cool the air. When heating, it is converted into a condenser for heating the air. The condenser of the heat pump system is installed in the exhaust box. When cooling, the heat of condensation is taken away by the indoor exhaust and the outdoor fresh air. When heating Converted into an evaporator to absorb heat from indoor exhaust and outdoor fresh air; the compressor and auxiliary device of the heat pump system are installed in the exhaust box, or installed in the blower box, or installed in the blower box and exhausted Outside the box; the electric control box of the power distribution control system is embedded in the air exhaust box or the air supply box, or is hung outside the air supply box or the air exhaust box, or is arranged separately from the air supply box and the air exhaust box; Adjustable air outlet, blower and exhaust fan are variable frequency speed control fans, heat pump system is variable capacity system; air supply box has air return port, and there is no return air outlet; air exhaust box has new air outlet, but also does not bring new The mouth of the wind. 2. The heat pump heat recovery air conditioning unit according to claim 1, wherein the connection between the air distribution box and the air supply box is integral, split, and multi-connected, and correspondingly, the heat pump system may be integral, Split-type, multi-connected, they can be placed indoors or outdoors. 3. The heat pump heat recovery air conditioning unit according to claim 1, wherein the hot water type heat pump heat recovery air conditioning unit is provided with a water cooler capable of providing hot water, which is connected in series, in parallel, or across a refrigerant pipe. Closed pressurized container or open pressureless container, it can also be converted into a hydrothermal heater to provide heat source for the heat pump system. It can also be used as a liquid storage device to store liquid refrigerant. 4. The heat pump heat recovery air conditioning unit according to claim 1, wherein the reheat type heat pump heat recovery air conditioning unit has a reheater and a device for controlling a refrigerant flow rate in the reheater, and the reheater can also be converted into an evaporator. . 5. The heat pump heat recovery air conditioning unit according to claim 1, wherein the dual-type heat pump heat recovery air conditioning unit has two sets of refrigeration systems, one of which is a heat pump system for air cooling or heating; and the other set It is a single cold or heat pump system for reheating or cooling of air. 6. The heat pump heat recovery air conditioning unit according to claim 2, wherein the multi-unit heat pump heat recovery air conditioning unit comprises a blower box, a fan box, a heat pump system, an outdoor unit, an additional device, a water cooler, and a power distribution control. The system, the heat pump system is connected to one or several air exhaust boxes or outdoor units, and two or several indoor units are connected. The heat pump heat recovery air conditioning unit according to claim 2, wherein the multi-type heat pump heat recovery air conditioning unit adopts a same-type heat pump system or a heat recovery type heat pump system. The heat pump heat recovery air conditioning unit according to claim 2, wherein the outdoor unit of the multi-unit heat pump heat recovery air conditioning unit has an outdoor unit or a exhaust fan, and the outdoor unit has a condenser, and can also be converted into an evaporator. It is not connected to the indoor exhaust, only exchanges heat with the outdoor air. When the outdoor unit is an outdoor unit, the indoor exhaust box can be without a fresh air outlet. When the outdoor unit is a exhaust box, the room can be set up. There may be no air exhaust box, and the indoor air exhaust box may or may not have a fresh air outlet. 9. The heat pump heat recovery air conditioning unit is composed of a blower box, a blower box, a heat pump system and a power distribution control system, wherein one type of heat pump system has a cylinder piston type liquid storage device capable of storing liquid refrigerant, wherein The cylinder piston type accumulator mainly comprises a cylinder casing, a piston, a cylinder end cover and a refrigerant circulation pipe, and the cylinder end cover is provided with a refrigerant circulation pipe, which is connected to a refrigerant cycle between the condenser and the evaporator of the heat pump system. The tube is connected to the expansion throttle valve to ensure the circulation and throttling of the refrigerant. The piston can move in the cylinder, and it moves from the high pressure end to the low pressure end, thereby forming a space for storing the high pressure liquid refrigerant in the cylinder, the piston An orifice tube can also be provided thereon, and a part of the high-pressure liquid refrigerant can be throttled to the low-pressure end to function as an expansion throttle. 10. The heat pump heat recovery air conditioning unit is composed of a blower box, a blower box, a heat pump system and a power distribution control system, wherein one type of heat pump system has a diaphragm type liquid storage device capable of storing liquid refrigerant, characterized in that the diaphragm The liquid storage device is mainly composed of a tank body, a diaphragm, an orifice tube and a refrigerant circulation tube. The diaphragm adopts a non-leakage elastic or flexible material, which is located in the center of the tank body and is divided into two independent spaces. A refrigerant circulation pipe is connected to a lower portion of the tank body, and these pipes are connected to a space on both sides of the tank diaphragm, and are connected between the condenser of the heat pump system and the evaporator, and are connected with the expansion throttle to ensure the refrigerant. Cycle and throttling, when the refrigerant circulation pipe is connected to the high pressure end on one side and the low pressure end on the other side, the diaphragm extends or expands from the high pressure side to the low pressure side, forming a large space on the high pressure side, and the high pressure liquid refrigerant is Where the circulation cycle, a part of the flow to the expansion throttle, the excess part is stored therein, and the lower part of the tank body may have an orifice tube, which connects the space on both sides of the diaphragm, a part of the high pressure liquid state From this, the refrigerant can be throttled to the low pressure end to function as an expansion throttle. 11. Heat pump heat recovery air conditioning unit, which is composed of a blower box, a fan box, a heat pump system, and a power distribution control system, wherein one heat pump system has a shared accumulator, characterized in that the heat pump system has bidirectional expansion throttling Through a variety of valve combinations and operating conditions, whether the system is cooling or heating, the shared reservoir can be operated on the high pressure side for storing high pressure liquid refrigerant.

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