WO2021208397A1 - Dehumidifying and drying apparatus and operating method thereof - Google Patents

Abstract

A dehumidifying and drying apparatus, comprising an air treatment cavity (4), a first and second evaporator cavities (1, 2), and a refrigerating system cavity (3). The air treatment cavity (4) is sequentially provided with a first filter screen (17), a sensible heat exchanger (18), a condenser (7), an axial flow fan (19) and a flow guide grid (20); a second evaporator (15) is of a columnar hollow structure and sequentially provided from inside to outside with fins (15d), thermoelectric refrigerating sheets (15c), a copper pipe (15b) and first heat preservation cotton (15a); two sides of the thermoelectric refrigeration sheets (15c) and the copper pipe (15b) are coated with heat-conducting glue; an outlet of a compressor (6) is sequentially connected to the condenser (7) and a liquid storage tank (8) and then divided into two paths, wherein one path is sequentially connected to a first throttling valve (9) and a first evaporator (10) and is connected to a suction pressure regulating valve (12) by means of a check valve (11), and wherein the other path is connected to a second throttling valve (14) and the second evaporator (15) by means of an electromagnetic valve (13) and is finally connected to the suction pressure regulating valve (12) by means of an evaporation pressure regulating valve (16); an outlet of the suction pressure regulating valve (12) is connected to an inlet of the compressor (6); and serving as heat source compensation, the second evaporator (15) reduces energy consumption of drying while meeting a load requirement, and the sensible heat exchanger (18) is used for pre-cooling incoming air, thus improving the energy efficiency of a system and reducing power consumption.

Description

Dehumidification drying equipment and working method thereof Technical field

The invention relates to the dehumidification, drying and drying of indoor air, in particular to a high-efficiency and energy-saving dehumidification and drying equipment with a heat source and a working method thereof.

Background technique

According to its dehumidification method, the dehumidification dryer can be divided into freezing type and adsorption type. It can dehumidify the air and supply air at a temperature slightly higher than the ambient temperature. In the household field, due to space constraints, in order to save space, dehumidifiers are generally small in size. As the air passes through the surface cooler to dehumidify and cool, it is a heat and mass exchange process with both sensible and latent heat. The flow air is cooled down to the dew point temperature, but also to meet the dehumidification requirements of the air. The load of the evaporator and the condenser varies greatly, and the traditional dehumidification dryer has a poor ability to adjust the load, so in some cases it can not even meet the normal Dehumidification requirements, poor comfort, provided heat can not meet the needs of drying or drying time is too long, practicality has been criticized for a long time.

At present, the main factor restricting the application and development of dehumidification and drying equipment is that the load adjustment cannot keep up or the cost required to achieve the required dehumidification and drying purpose is too high, that is, low efficiency and uneconomical. In the drying mode, electric heating is used as a heat source for drying. Dry provides heat, the energy efficiency ratio is always less than 1, which is difficult to meet the requirements of drying, and the expense is greater than the benefit. According to the principle of thermoelectric refrigeration with heating efficiency greater than 1, a heat source that replaces electric heating is developed and produced to provide sufficient drying equipment Heat supply can improve the energy efficiency of the entire machine while ensuring the stable operation of the machine. It is a top priority and is of great significance.

Summary of the invention

The purpose of the present invention is to provide a dehumidification drying equipment and a working method thereof that increase a second evaporator as a heat source and use a sensible heat exchanger to recover heat in response to ordinary users' needs for indoor environment dehumidification and drying of clothes.

The invention can overcome the problems of large power consumption and poor load regulation ability of the previous dehumidification drying equipment, reduce the load of the heat exchanger, and meanwhile the equipment has good load regulation ability.

In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

A dehumidification drying equipment includes a housing 27 in which a first evaporator cavity 1, a second evaporator cavity 2, a refrigeration system cavity 3, an air processing cavity 4, and a circuit board control cavity 5 are arranged, Wherein the first evaporator cavity 1 is provided with a first evaporator 10, the second evaporator cavity 2 is provided with a second evaporator 15, a second filter 21 and a centrifugal fan 22, the refrigeration system cavity 3 A compressor 6 and a liquid storage tank 8 are provided. The air processing chamber 4 is provided with a first filter screen 17, a sensible heat exchanger 18, a condenser 7, an axial flow fan 19, and a guide grid 20 from left to right. , An AC-DC converter 23a and a voltage regulator 23b are mounted on the circuit board 23 provided in the circuit board control cavity 5;

The circuit board 23 in the circuit board control cavity 5 is respectively connected to the compressor 6, the axial fan 19 and the centrifugal fan 22 through wires, and the AC/DC converter 23a and the voltage regulator 23b on the circuit board 23 are integrated When the circuit is turned on, the voltage regulator 23b is also connected to the thermoelectric cooling fin 15c in the second evaporator 15 through a wire to control the magnitude of the voltage applied to it;

The outlet of the compressor 6 in the refrigeration system cavity 3 is connected to the inlet of the condenser 7 through a pipe, the outlet of the condenser 7 is connected to the inlet of the liquid storage tank 8, and the outlet of the liquid storage tank 8 is connected to the inlet of the first throttle valve 9. The outlet of the first throttle valve 9 is connected to the inlet of the first evaporator 10 in the first evaporator cavity 1, and the outlet of the first evaporator 10 is connected to the compressor 6 through the check valve 11 and the suction pressure regulating valve 12 in turn At the inlet, a water receiving pan 26 is further provided under the first evaporator 10, and the water outlet of the water receiving pan 26 is connected to a water receiving device 25 arranged outside the housing 27 through a hose 24.

Further preferably, the outlet of the liquid storage tank 8 is also connected to the inlet of the second throttle valve 14 through the solenoid valve 13, the outlet of the second throttle valve 14 is connected to the inlet of the second evaporator 15, and the outlet of the second evaporator 15 passes through the evaporator in turn. The pressure regulating valve 16 and the suction pressure regulating valve 12 are connected to the inlet of the compressor 6.

Further preferably, the second evaporator 15 is a cylindrical hollow structure, which is surrounded by a plurality of fins 15d, a plurality of thermoelectric cooling fins 15c, a copper tube 15b, and a first thermal insulation cotton 15a from the inside to the outside, wherein the thermoelectric cooling Both sides of the sheet 15c and the copper tube 15b are respectively coated with thermal conductive glue.

Further preferably, a second thermal insulation cotton 28 is filled between the first evaporator cavity 1 and the second evaporator cavity 2.

Further preferably, the water receiver 25 is a detachable water receiver with a visible liquid level.

Further preferably, the condenser 7 is a tube-fin heat exchanger, a micro-tube channel heat exchanger or an insert micro-channel heat exchanger.

The working method of the dehumidification drying equipment of the present invention includes two working modes of dehumidification and drying,

1. The specific content and steps of the dehumidification working mode are as follows:

The compressor 6 is started, the axial fan 19 is started, the centrifugal fan 22 is closed, and the solenoid valve 13 is closed. The refrigerant from the first evaporator 10 passes through the check valve 11 and the suction pressure regulating valve 12 and is sucked by the compressor 6 Compressed, heated and pressurized, discharged from the outlet of the compressor 6 into the condenser 7 and condensed into a liquid refrigerant, and then sent to the liquid storage tank 8 through a pipeline. The liquid refrigerant flows out of the outlet of the liquid storage tank 8 and passes through the first section After the flow valve 9 throttling and depressurizing, it enters the first evaporator 10 to absorb heat and evaporate, and finally becomes a gaseous refrigerant, and is sucked and compressed by the compressor 6 through the check valve 11 and the suction pressure regulating valve 12, and enters the next cycle ；

In the air processing chamber 4, the indoor air first passes through the first filter screen 17 to filter impurities and particulate matter, and then enters the sensible heat exchanger 18, and the incoming air enters the sensible heat exchanger 18 through the inlet a of the sensible heat exchanger 18, from The outlet b of the sensible heat exchanger 18 flows out and enters the first evaporator cavity 1 and performs heat exchange and dehumidification treatment with the first evaporator 10. The dehumidified and cooled air flows out from the first evaporator cavity 1 and enters the sensible heat exchanger 18 c flows in, exchanges heat with the untreated indoor air, and flows out from the outlet d of the sensible heat exchanger 18, and then absorbs heat through the surface of the condenser 7 and is sent back to the indoor environment by the axial flow fan 19 through the guide grid 20, and the condensed water is connected by the The water pan 26 is caught and stored in the water receiver 25 through the hose 24;

2. The specific content and steps of the drying mode are as follows:

On the basis of the dehumidification mode, the centrifugal fan 22 is started, the solenoid valve 13 is opened, the AC-DC converter 23a and the voltage regulator 23b work. After the valve 9 throttling and depressurizing, it enters the first evaporator 10 to absorb heat and evaporate, and the other way flows through the solenoid valve 13 and then passes through the second throttle valve 14 for throttling and cooling and sending to the second evaporator 15 to absorb heat and evaporate. The gaseous refrigerant passes through the check valve 11 and the evaporation pressure regulating valve 16 respectively, and is sucked and compressed by the compressor 6 through the suction pressure regulating valve 12, and enters the next cycle. In the second evaporator cavity 2, the gas first passes through the second evaporator cavity 2. The second filter 21 filters, and then flows through the second evaporator 15 to absorb the cold energy of the second evaporator 15, and finally returns to the room through the centrifugal fan 22.

Further preferably, the power supply voltage of the thermoelectric cooling fins 15c in the second evaporator 15 is in a proportional adjustment relationship with the temperature of the air outlet at the guide grid 20 provided.

Description of the drawings

Figure 1 is a schematic diagram of the device system structure of the present invention;

Description of reference signs in the figure: 1 is the first evaporator cavity, 2 is the second evaporator cavity, 3 is the refrigeration system cavity, 4 is the air processing cavity, 5 is the circuit board control cavity, 6 is the compressor, 7 is the condensation 8 is the liquid storage tank, 9 is the first throttle valve, 10 is the first evaporator, 11 is the check valve, 12 is the suction pressure regulating valve, 13 is the solenoid valve, 14 is the second throttle valve, 15 Is the second evaporator, 16 is the evaporative pressure regulating valve, 17 is the first filter, 18 is the sensible heat exchanger, 19 is the axial flow fan, 20 is the guide grid, 21 is the second filter, 22 is the centrifugal fan , 23 is a circuit board, 23a is an AC-DC converter, 23b is a voltage regulator, 24 is a hose, 25 is a water receiver, 26 is a water tray, 27 is a shell, and 28 is a second thermal insulation cotton.

Figure 2 is a schematic diagram of the second evaporator structure;

Description of reference signs in the figure: 15a is the first thermal insulation cotton, 15b is a copper tube, 15c is a thermoelectric cooling sheet, and 15d is a fin.

Detailed ways

In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 1: It is a dehumidification and drying equipment of the present invention, which includes a housing 27 in which a first evaporator cavity 1, a second evaporator cavity 2, a refrigeration system cavity 3, and air The processing chamber 4 and the circuit board control chamber 5, the first evaporator chamber 1 is provided with a first evaporator 10, and the second evaporator chamber 2 is provided with a second evaporator 15, a second filter 21 and a centrifugal fan twenty two;

The refrigeration system cavity 3 is provided with a compressor 6 and a liquid storage tank 8, and the air processing chamber 4 is provided with a first filter 17, a sensible heat exchanger 18, a condenser 7, and an axial flow from left to right. The fan 19 and the guide grid 20. The circuit board 23 in the circuit board control cavity 5 is equipped with an AC/DC converter 23a and a voltage regulator 23b. All the cavities are installed in the housing 27 because of the second evaporation The core component of the device 15 is the thermoelectric cooling plate 15c, so an AC-DC converter 23a is required to provide a DC voltage for it, and the voltage regulator 23b can provide voltages of different magnitudes as required.

In the circuit board control cavity 5, the circuit board 23 is respectively connected to the compressor 6, the axial flow fan 19 and the centrifugal fan 22 through wires, and the AC/DC converter 23a and the voltage regulator 23b on the circuit board 23 are connected through an integrated circuit. The voltage regulator 23b is also connected to the thermoelectric cooling fin 15c in the second evaporator 15 through a wire to control the voltage applied to it;

In the refrigeration system cavity 3, the outlet of the compressor 6 is connected to the inlet of the condenser 7 through a pipe, the outlet of the condenser 7 is connected to the inlet of the liquid storage tank 8, and the outlet of the liquid storage tank 8 is connected to the inlet of the first throttle valve 9 and the first throttle The outlet of the flow valve 9 is connected to the inlet of the first evaporator 10 in the first evaporator cavity 1, and the liquid storage tank 8 can flexibly distribute the amount of circulating refrigerant according to the system load, so that the system is in an optimal operating state;

The outlet of the first evaporator 10 is connected to the inlet of the compressor 6 through a check valve 11 and a suction pressure regulating valve 12, a water receiving pan 26 is provided under the first evaporator 10, and the water outlet of the water receiving pan 26 is through a hose 24 is connected to a water receiver 25 arranged on the outside of the housing 27.

The outlet of the liquid storage tank 8 is also connected to the inlet of the second throttle valve 14 through the solenoid valve 13, the outlet of the second throttle valve 14 is connected to the inlet of the second evaporator 15, and the outlet of the second evaporator 15 passes through the evaporation pressure regulating valve in turn 16 and the suction pressure regulating valve 12 are connected to the inlet of the compressor 6, which is another circuit of the refrigeration system. The second evaporator can be used as an additional heat source to increase the system's ability to adjust and adapt to the load.

The structure of the second evaporator 15 is a cylindrical hollow structure surrounded by a number of thermoelectric cooling fins 15c. As shown in FIG. 2, fins 15d, thermoelectric cooling fins 15c, copper tubes 15b and first Insulation cotton 15a, in which the thermoelectric cooling sheet 15c and the copper tube 15b are coated with thermal conductive glue on both sides, the thermal conductive glue absorbs the heat generated by the hot end of the thermoelectric cooling sheet 15c to the maximum, and the fin 15d is more helpful The flowing air absorbs the cold energy of the cold end of the thermoelectric cooling fin 15c, and the first thermal insulation cotton 15a avoids heat loss to the greatest extent.

The second thermal insulation cotton 28 is filled between the first evaporator cavity 1 and the second evaporator cavity 2 to avoid heat loss caused by cross-heating between the two cavities and increase the load of the heat exchanger.

A detachable water receiver 25 with visible liquid level is installed outside the housing 27. The water receiver 25 is connected to a hose 24 through a quick connector, and the condensed water in the water tray 26 is drained to the water receiver through the hose 24. In the container 25, the condensed water can be drained in time according to the height of the liquid level to avoid the accumulation of liquid in the water receiving tray 26. The quick connector makes it more convenient to install and unload the water receiver 25.

The condenser 7 is a heat exchanger with high heat exchange efficiency and compactness, such as a tube-fin heat exchanger, a micro-tube channel heat exchanger, or an insert micro-channel heat exchanger. The need for heat exchange efficiency.

The working method of the dehumidification drying equipment of the present invention includes two working modes of dehumidification and drying,

1. The specific content and steps of the dehumidification working mode are as follows:

The compressor 6 is started, the axial fan 19 is started, the centrifugal fan 22 is closed, and the solenoid valve 13 is closed. The low-temperature and low-pressure gaseous refrigerant evaporated by the first evaporator 10 passes through the check valve 11 and the suction pressure regulating valve 12 in turn. It is sucked and compressed by the compressor 6, and the suction pressure regulating valve 12 can adjust the suction pressure into the compressor 6, avoiding an excessively high compression ratio and making the refrigeration system operate stably;

The high-temperature and high-pressure gas refrigerant is discharged from the outlet of the compressor 6, and then the high-temperature and high-pressure refrigerant enters the condenser 7 to release heat to the air flowing through the surface of the condenser 7 and condense into a liquid refrigerant, which is then sent through the pipeline In the liquid storage tank 8, the liquid storage tank 8 mainly fills the refrigerant when the circulating refrigerant of the refrigeration system is insufficient, and appropriately stores the excess refrigerant when the refrigerant is excessive;

The liquid refrigerant flows out of the outlet of the liquid storage tank 8 and passes through the first throttle valve 9 to throttle and reduce pressure to become a gas-liquid two-phase refrigerant, and then the refrigerant enters the first evaporator 10 to absorb heat and evaporate in the first evaporator. The outlet of the device 10 becomes a gaseous refrigerant, and finally the gaseous refrigerant is sucked into the compressor 6 again through the check valve 11 and the suction pressure regulating valve 12, and enters the next cycle;

In the air processing chamber 4, the indoor air is first filtered through the first filter 17 to filter impurities and particulates, and the incoming air is filtered. This is not only the need for indoor air purification, but also considering that the particulates in the air will settle in heat exchange. Dirt thermal resistance is formed on the surface of the device, which affects the heat exchange efficiency of the equipment and ultimately increases the operating energy consumption of the system;

The air passing through the first filter screen 17 enters the sensible heat exchanger 18, the incoming air enters the sensible heat exchanger 18 through the inlet a of the sensible heat exchanger 18, and flows out from the outlet b of the sensible heat exchanger 18 and enters the first evaporator cavity. 1 Perform heat exchange and dehumidification with the first evaporator 10. The dehumidified and cooled air flows out of the first evaporator cavity 1 and flows in from the inlet c of the sensible heat exchanger 18, and exchanges heat with untreated indoor air from the sensible room. The outlet d of the heat exchanger 18 flows out, and the two air flows in the sensible heat exchanger 18 cross heat exchange and are in indirect contact. There is only heat exchange but no humidity exchange to ensure the dehumidification effect;

After the heat is absorbed by the surface of the condenser 7 and returned to the indoor environment by the axial fan 19 through the guide grid 20, a water receiving pan 26 is installed at the bottom of the first evaporator 10. The pipe 24 is stored in the water receiver 25.

2. The specific content and steps of the drying mode are as follows:

On the basis of the dehumidification mode, the centrifugal fan 22 is started, the solenoid valve 13 is opened, the AC-DC converter 23a and the voltage regulator 23b work. After the valve 9 throttling and depressurizing, it enters the first evaporator 10 to absorb heat and evaporate, and the other way flows through the solenoid valve 13 and then passes through the second throttle valve 14 for throttling and cooling and sending to the second evaporator 15 to absorb heat and evaporate. The gaseous refrigerant passes through the check valve 11 and the evaporation pressure regulating valve 16 respectively, and is sucked and compressed by the compressor 6 through the suction pressure regulating valve 12, and enters the next cycle. In the second evaporator cavity 2, the gas first passes through the second evaporator cavity 2. The second filter screen 21 filters, and then flows through the second evaporator 15 to absorb the cold energy of the second evaporator 15, and finally returns to the room through the centrifugal fan 22. The AC/DC converter 23a can be the thermoelectric cooling plate 15c in the second evaporator 15. Providing direct current, the voltage regulator 23b can adjust the voltage passing through the thermoelectric cooling fins 15c in the second evaporator 15. According to different load requirements, the voltage can be adjusted to increase or decrease the heat provided in the drying mode.

The power supply voltage of the thermoelectric cooling fins 15c in the second evaporator 15 is in a direct proportional adjustment relationship with the temperature of the air outlet at the guide grid 20. When the temperature of the air outlet increases, the voltage regulator 23b adjusts the power supply voltage increase. High, when the temperature of the set air outlet decreases, the voltage regulator 23b adjusts the supply voltage to decrease.

Although the present invention is disclosed as above, the present invention is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims (8)

A dehumidification drying equipment, comprising a housing (27), characterized in that a first evaporator cavity (1), a second evaporator cavity (2), and a refrigeration system cavity ( 3) Air processing cavity (4) and circuit board control cavity (5), wherein the first evaporator cavity (1) is provided with a first evaporator (10), and the second evaporator cavity (2) is provided with There is a second evaporator (15), a second filter screen (21) and a centrifugal fan (22). The refrigeration system cavity (3) is provided with a compressor (6) and a liquid storage tank (8). The air The processing chamber (4) is provided with a first filter (17), a sensible heat exchanger (18), a condenser (7), an axial fan (19) and a guide grid (20) from left to right, so An AC-DC converter (23a) and a voltage regulator (23b) are installed on the circuit board (23) arranged in the circuit board control cavity (5); The circuit board (23) in the circuit board control cavity (5) is respectively connected to the compressor (6), the axial flow fan (19) and the centrifugal fan (22) through wires. The AC-DC converter (23a) and the voltage regulator (23b) are connected through an integrated circuit, and the voltage regulator (23b) is also connected to the thermoelectric cooling fins (15c) in the second evaporator (15) through wires to Control the voltage applied to it; The outlet of the compressor (6) in the refrigeration system cavity (3) is connected to the inlet of the condenser (7) through a pipe, the outlet of the condenser (7) is connected to the inlet of the liquid storage tank (8), and the outlet of the liquid storage tank (8) Connected to the inlet of the first throttle valve (9), the outlet of the first throttle valve (9) is connected to the inlet of the first evaporator (10) in the first evaporator cavity (1), the first evaporator (10) The outlet is connected to the inlet of the compressor (6) through a check valve (11) and a suction pressure regulating valve (12) in turn, and a water receiving pan (26) is also provided under the first evaporator (10), The water outlet of the water receiving tray (26) is connected to the water receiving device (25) arranged on the outside of the housing (27) through a hose (24). The dehumidification and drying equipment according to claim 1, wherein the outlet of the liquid storage tank (8) is also connected to the inlet of the second throttle valve (14) through a solenoid valve (13), and the second throttle valve (14) The outlet is connected to the inlet of the second evaporator (15), and the outlet of the second evaporator (15) is connected to the inlet of the compressor (6) through the evaporation pressure regulating valve (16) and the suction pressure regulating valve (12) in turn . The dehumidification drying equipment according to claim 1, characterized in that the second evaporator (15) is a cylindrical hollow structure, which consists of a plurality of fins (15d) and a plurality of thermoelectric cooling fins (15c) from the inside to the outside. ), the copper tube (15b) and the first thermal insulation cotton (15a) are surrounded and formed, wherein the thermoelectric cooling sheet (15c) and the copper tube (15b) are respectively coated with thermal conductive glue on both sides. The dehumidification drying equipment according to claim 1, characterized in that, a second thermal insulation cotton (28) is filled between the first evaporator cavity (1) and the second evaporator cavity (2). The dehumidification drying equipment according to claim 1, wherein the water receiver (25) is a detachable water receiver with a visible liquid level. The dehumidification drying equipment according to claim 1, wherein the condenser (7) is a tube-fin heat exchanger, a micro-tube channel heat exchanger, or an insert micro-channel heat exchanger. A working method of dehumidification and drying equipment is characterized in that it includes the following two working modes: dehumidification and drying, 1. The specific content and steps of the dehumidification working mode are as follows: The compressor (6) is started, the axial fan (19) is started, the centrifugal fan (22) is closed, the solenoid valve (13) is closed, and the refrigerant coming out of the first evaporator (10) passes through the check valve (11) and The suction pressure regulating valve (12) is sucked and compressed by the compressor (6). After being heated and pressurized, it is discharged from the outlet of the compressor (6) and enters the condenser (7) to be condensed into a liquid refrigerant, and then sent to the storage through a pipeline. In the liquid tank (8), the liquid refrigerant flows out from the outlet of the liquid storage tank (8), passes through the first throttle valve (9), throttling and depressurizing, enters the first evaporator (10) to absorb heat and evaporate, and finally becomes The gaseous refrigerant is again sucked and compressed by the compressor (6) through the check valve (11) and the suction pressure regulating valve (12), and enters the next cycle; In the air processing chamber (4), the indoor air first passes through the first filter screen (17) to filter impurities and particulate matter, and then enters the sensible heat exchanger (18), and the incoming air enters through the sensible heat exchanger (18) inlet a In the sensible heat exchanger (18), it flows out from the outlet b of the sensible heat exchanger (18) and enters the first evaporator cavity (1) to exchange heat and dehumidify with the first evaporator (10), and dehumidify the cooled air It flows out from the first evaporator cavity (1) and flows in from the inlet c of the sensible heat exchanger (18), exchanges heat with untreated indoor air, flows out from the outlet d of the sensible heat exchanger (18), and then passes through the condenser ( 7) The heat absorbed by the surface is sent back to the indoor environment by the axial flow fan (19) through the guide grid (20), and the condensed water is caught by the water tray (26) and stored in the water receiver (25) through the hose (24). )middle; 2. The specific content and steps of the drying mode are as follows: On the basis of the dehumidification mode, the centrifugal fan (22) is started, the solenoid valve (13) is opened, the AC-DC converter (23a) and the voltage regulator (23b) work, at this time, the refrigerant coming out of the liquid storage tank (8) It is divided into two paths, one path passes through the first throttle valve (9) throttling and pressure reduction, and then enters the first evaporator (10) to absorb heat and evaporate, and the other path flows through the solenoid valve (13) and then passes through the second throttle valve (14). ) Throttle cooling is sent to the second evaporator (15) to absorb heat and evaporate, and the gaseous refrigerant from the two paths passes through the check valve (11) and the evaporation pressure regulating valve (16) and then passes through the suction pressure regulating valve (12) It is sucked and compressed by the compressor (6) and enters the next cycle. In the second evaporator cavity (2), the gas is filtered by the second filter (21), and then flows through the second evaporator (15) to absorb the second evaporator. The cooling capacity of the second evaporator (15) is finally returned to the room through the centrifugal fan (22). The dehumidification drying equipment according to claim 7, characterized in that the power supply voltage of the thermoelectric cooling fins (15c) in the second evaporator (15) and the air outlet at the guide grid (20) are set The temperature is proportional to the relationship.

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