JP2002187425A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for vehicle, of which the connection operation is easy and the reliability in terms of quality, such as liquid-spill-proof, can be improved. SOLUTION: A piping (an outer piping) 46 discharging a refrigerant from an evaporator 7 coaxially houses an inner piping 47 supplying a refrigerant from a sub-condenser 4, forming a double piping 44, which is fitted to the evaporator 7. Thus, the number of pipe connections and piping can be reduced, and heat utilization efficiency can be also improved as a result of the heat exchange between the piping 47 supplying the refrigerant with the sub-condenser 4 and the outer piping 46 discharging the refrigerant from the evaporator 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle having a sub-condenser.

[0002]

2. Description of the Related Art Generally, an air conditioner for a vehicle includes:
Some include a refrigeration cycle for circulating the refrigerant to exchange heat between the refrigerant and the air, and a hot water line for exchanging heat using engine cooling water heated by exhaust heat of the engine.

In such a vehicle air conditioner, an evaporator as a heat absorbing vehicle interior heat exchanger incorporated in a refrigeration cycle and a hot water line are provided in a vehicle interior air flow path into which inside and outside air are selectively introduced. A heater core as a built-in heat generating means is provided. Then, the air flowing through the vehicle interior air flow path is absorbed by the refrigerant in the evaporator to generate cold air, and the air flowing through the vehicle interior air flow path is heated by the heater core to generate hot air. Then, by adjusting the ratio of the cold air and the hot air by the air mix door, the temperature in the vehicle compartment is adjusted.

In such a conventional air conditioner for a vehicle, warm air is produced by using a heater core using engine cooling water as a heat source.
When the temperature of the engine cooling water is not sufficiently high, such as immediately after the start of the engine or when the running load is small, there is a problem that the temperature in the passenger compartment cannot be sufficiently raised.

As a measure against such a problem, Japanese Patent Application Laid-Open No.
An air conditioner for a vehicle has been proposed as disclosed in JP-A-175140 and JP-A-1044742. In these vehicle air conditioners, a sub-condenser as a heat-dissipating vehicle interior heat exchanger that dissipates heat of the refrigerant to the air in the vehicle interior is incorporated in the refrigerant line. The sub-condenser, together with the evaporator and the heater core, is arranged in the vehicle interior air flow path.

In the vehicle air conditioner having such a structure, in addition to the heater core using the engine cooling water as a heat source,
Since warm air is generated using a sub-condenser that uses refrigerant as a heat source, even when the engine coolant temperature is not sufficiently high, such as immediately after engine startup or when the running load is small, Thus, the temperature in the vehicle compartment can be raised relatively quickly.

[0007]

However, in the above-described air conditioner for a vehicle, the structure becomes complicated because the number of pipes newly connected to the sub-condenser increases in addition to the pipes connected to the evaporator and the heater core. There was a problem. Along with this, the pipes of the evaporator, heater core, and sub-condenser are respectively protruded into the engine room, and are connected to the corresponding pipes of the engine room side unit provided on the engine room side. Therefore, there is a problem that the operation cost is increased. In addition, since the number of pipe connections increases,
There is a problem that concerns about quality, such as leakage of a liquid such as a refrigerant, increase.

The present invention has been made to solve such a problem. An object of the present invention is to provide an air conditioner for a vehicle capable of enhancing the reliability in terms of quality, such as connection working for a vigilant simple liquid.

[0009]

According to the first aspect of the present invention,
An air conditioner for a vehicle, comprising: a first refrigerant passage; and a second refrigerant passage having two passages by branching, wherein each of the first refrigerant passage and the second refrigerant passage has one. It is characterized in that the passages are formed coaxially.

According to the first aspect of the present invention, since the first refrigerant passage and the second refrigerant passage are formed coaxially, the number of pipes is reduced to improve the connection workability. Can be.

According to a second aspect of the present invention, there is provided a refrigeration cycle including a compressor, a radiator (main condenser), an expansion device (expansion valve), and a heat absorber (evaporator) discharged from the compressor (compressor). In a vehicle air conditioner having a cycle of branching and merging into at least two refrigerant passages during suction circulation to the compressor (compressor), a common low-pressure path after heat absorption and piping of any one of the refrigerant passages Are formed coaxially.

Therefore, according to the second aspect of the present invention, the low pressure path after heat absorption and the at least two branched refrigerant passages are made coaxial to improve the handleability of the piping forming the refrigerant passage. Can be.

Further, the invention according to claim 3 is the invention according to claim 1.
Alternatively, in the air conditioner for a vehicle according to claim 2, the coaxially formed passages are such that an outer passage is a low-pressure passage during a cycle and an inner passage is a high-pressure passage.

Therefore, according to the third aspect of the invention, heat exchange between the high-pressure refrigerant and the low-pressure refrigerant is possible.

According to a fourth aspect of the present invention, the refrigerant discharged from the compressor is sequentially introduced into the indoor heat exchanger for heat absorption through the exterior heat exchanger and the expansion valve, and the indoor heat exchange for heat absorption is performed. A first refrigerant passage for circulating the refrigerant discharged from the compressor to the compressor and the refrigerant discharged from the compressor are sequentially introduced to the indoor heat exchanger for heat absorption through the indoor heat exchanger for heat radiation and the expansion valve. A second refrigerant passage for circulating the refrigerant discharged from the heat-absorbing indoor heat exchanger to the compressor), and supplying the refrigerant to the heat-radiating indoor heat exchanger. A refrigerant supply pipe and a refrigerant discharge pipe for discharging a refrigerant from the indoor heat exchanger for heat absorption are integrated.

Therefore, according to the fourth aspect of the present invention, the refrigerant supplied to the indoor heat exchanger for heat radiation and the refrigerant discharged from the indoor heat exchanger for heat absorption exchange heat by integrating the pipes. As a result, the temperature of the low-pressure side refrigerant increases, so that the immediate warming performance is improved. In addition, heat exchange can increase thermal efficiency and achieve energy saving. In addition, by integrating the refrigerant supply pipe and the refrigerant discharge pipe, the handling of the pipe is improved, and the pipe connection workability can be improved. Further, according to the fourth aspect of the present invention, it is possible to secure the gaseous refrigerant passage and to integrate the pipes while suppressing the pressure loss.

Further, in the invention according to claim 5, the refrigerant discharged from the compressor is sequentially introduced into the indoor heat exchanger for heat absorption through the exterior heat exchanger and the expansion valve, and the indoor heat exchange for heat absorption is performed. A first refrigerant passage for circulating the refrigerant discharged from the compressor to the compressor and the refrigerant discharged from the compressor are sequentially introduced to the indoor heat exchanger for heat absorption through the indoor heat exchanger for heat radiation and the expansion valve. A second refrigerant passage for circulating a refrigerant discharged from the heat absorbing indoor heat exchanger to the compressor, wherein the heat absorbing indoor heat exchanger is connected to the heat absorbing indoor heat exchanger. A refrigerant supply pipe for supplying a refrigerant to a heat exchanger and a refrigerant discharge pipe for discharging a refrigerant from the heat-absorbing indoor heat exchanger are integrated.

Therefore, according to the fifth aspect of the present invention, the refrigerant supply pipe for supplying the cooled refrigerant from the heat exchanger outside the vehicle compartment to the indoor heat exchanger for heat absorption, and the refrigerant heated from the indoor heat exchanger for heat absorption, By integrating with the refrigerant discharge pipe to discharge, heat exchange can be performed between the refrigerant supply pipe and the refrigerant discharge pipe, and the refrigerant sent to the compressor can be cooled, Power can be reduced.

According to a sixth aspect of the present invention, there is provided an air conditioner for a vehicle according to the fourth or fifth aspect,
The refrigerant supply pipe and the refrigerant discharge pipe are coaxial double pipes.

Therefore, in the invention according to claim 6, since the refrigerant supply pipe and the refrigerant discharge pipe are coaxial double pipes, the connectivity and handling of the pipes can be greatly improved.

[0021] Further, the invention according to claim 7 is based on claim 4.
The vehicle air conditioner according to any one of claims 1 to 6, wherein the refrigerant supply pipe is disposed in the refrigerant discharge pipe along the axial direction.

Therefore, according to the seventh aspect of the present invention, it is possible to secure the passage of the gasified refrigerant in the refrigerant discharge pipe, and to achieve the integration while suppressing the pressure loss.

The invention according to claim 8 is the air conditioner for a vehicle according to claim 6 or 7,
One end of the double pipe is formed such that an outer pipe is bent in a direction perpendicular to a flow path of the double pipe.

Therefore, according to the invention of claim 8, it is possible to easily connect the pipe outside the double pipe to, for example, an indoor heat exchanger.

Further, according to the ninth aspect of the present invention, there is provided the fourth aspect of the present invention.
The vehicle air conditioner according to any one of claims 1 to 8, wherein the indoor heat exchanger for heat absorption and the indoor heat exchanger for heat dissipation are housed in the same unit. I do.

Therefore, according to the ninth aspect of the present invention, the refrigerant passages derived from the indoor heat exchanger for heat absorption and the indoor heat exchanger for heat radiation housed in the same unit can be integrated, and the refrigerant passage can be integrated. The attachment of the formed pipe can be improved.

The invention according to claim 10 is the same as the invention according to claim 6.
The vehicle air conditioner according to any one of claims 1 to 9, wherein the double pipe is disposed in a heat-absorbing indoor heat exchanger.

Therefore, in the invention according to claim 10,
By arranging double piping in the indoor heat exchanger for heat absorption,
The branched flow path of the double pipe can be easily connected to the heat absorbing indoor heat exchanger.

The invention according to claim 11 is the same as the invention according to claim 4.
11. The vehicle air conditioner according to claim 10, wherein the indoor heat exchanger for heat radiation is a sub-condenser arranged near a heater core.

Therefore, according to the eleventh aspect of the present invention,
Since the indoor heat exchanger for heat dissipation is arranged near the heater core as the heat generating means, heat from the heater core can be effectively transmitted to the sub-condenser. As a result, the temperature load on the sub-condenser can be increased, and the refrigerant discharge pressure (Pd) is quickly increased to quickly increase the temperature in the vehicle compartment, that is, extremely excellent rapid heating performance is exhibited. be able to.

[0031]

According to the first aspect of the present invention, since the first refrigerant passage and the second refrigerant passage are formed coaxially,
This has the effect of reducing the number of pipes and improving the connection workability.

According to the second aspect of the present invention, the low pressure path after heat absorption and the at least two branched refrigerant passages are coaxial, thereby improving the handleability of piping forming the refrigerant passages. There is.

According to the third aspect of the present invention, heat exchange between the high-pressure side refrigerant and the low-pressure side refrigerant becomes possible, and there is an efficiency of increasing thermal efficiency.

According to the fourth aspect of the present invention, the refrigerant supplied to the indoor heat exchanger for heat radiation and the refrigerant discharged from the indoor heat exchanger for heat absorption exchange heat by integrating pipes. In addition, there is an efficiency of increasing the temperature of the low-pressure side refrigerant to immediately improve the warming property. In addition, heat exchange can increase heat efficiency, and there is an efficiency of achieving energy saving. Further, by integrating the refrigerant supply pipe and the refrigerant discharge pipe, the handling of the pipe is improved, and the pipe connection workability can be improved. Furthermore, according to the fourth aspect of the present invention, it is possible to secure the gaseous refrigerant passage and to integrate the pipes while suppressing the pressure loss. In addition, since the high-pressure path is formed coaxially where the low-pressure pipes are concentrated, the pipe path can be further simplified.

According to the fifth aspect of the present invention, a refrigerant supply pipe for supplying the cooled refrigerant from the heat exchanger outside the vehicle compartment to the indoor heat exchanger for heat absorption, and the refrigerant heated from the indoor heat exchanger for heat absorption is provided. The heat exchange between the refrigerant supply pipe and the refrigerant discharge pipe can be performed by integrating the refrigerant discharge pipe with the refrigerant discharge pipe. For this reason, the refrigerant sent to the compressor can be cooled, and the power of the compressor can be reduced.

According to the sixth aspect of the present invention, since the refrigerant supply pipe and the refrigerant discharge pipe are coaxial double pipes, there is an effect of greatly improving the connectivity and handleability of the pipes.

According to the seventh aspect of the present invention, it is possible to secure the passage of the refrigerant in a gaseous state in the refrigerant discharge pipe, and to achieve the integration while suppressing the pressure loss.

According to the eighth aspect of the present invention, it is possible to easily connect a pipe outside the double pipe to, for example, an indoor heat exchanger.

According to the ninth aspect of the invention, the refrigerant passages derived from the indoor heat exchanger for heat absorption and the indoor heat exchanger for heat radiation housed in the same unit can be integrated.
This has the effect of improving the attachment of the pipe having the refrigerant passage.

According to the tenth aspect of the present invention, by disposing the double pipe in the indoor heat exchanger for heat absorption, the branched flow path of the double pipe is easily connected to the indoor heat exchanger for heat absorption. be able to.

According to the eleventh aspect of the present invention, since the indoor heat exchanger for heat dissipation is arranged near the heater core as the heat generating means, the heat from the heater core can be effectively transmitted to the sub-condenser. Thereby, the temperature load of the sub-condenser can be increased, and the refrigerant discharge pressure (P
d) is quickly raised, so that the temperature in the vehicle compartment is quickly raised to exhibit good rapid heating performance.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, will be explained with reference to embodiments shown the details of the vehicle air conditioner according to the invention in the drawings. However, in the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. Further, the drawings are schematic, and the actual size ratios and shapes of the respective parts are different.

(First Embodiment) FIG. 1 is an explanatory side view of an indoor air conditioning unit 8 of a vehicle air conditioner 1 showing an embodiment of the present invention, and FIG. FIG. 3 is a side view showing a main part of the harmonic device 1, FIG. 3 is a perspective view of the main part, and FIG. 4 is a plan view of the main part. The vehicle air conditioner 1 of the present embodiment is characterized in that a unique double-pipe structure pipe is provided in a pipe member connected to the indoor unit side. The vehicle air conditioner 1 includes a refrigeration cycle for circulating a refrigerant and a hot water line for circulating engine cooling water.

Here, prior to the description of the piping structure and connection layout of the double-pipe structure, which are features of this embodiment,
The configuration of the refrigeration cycle and the temperature line will be described with reference to FIG. 5 in relation to the indoor unit.

As shown in FIG. 5, the vehicle air conditioner 1
The refrigeration cycle of the first embodiment includes a compressor 2, a main condenser 3 as a heat exchanger outside the vehicle, a sub-condenser 4 as a heat exchanger inside the vehicle, and a liquid tank 5
, An expansion valve 6 and an evaporator 7 as a heat-absorbing vehicle interior heat exchanger are connected via a pipe member, and a refrigerant provided with kinetic energy by the compressor 2 circulates between them. ing.

The compressor 2 is disposed in an engine room outside the vehicle compartment, compresses the sucked low-pressure gas-phase refrigerant, and discharges it as a high-pressure gas-phase refrigerant. In the present embodiment, the low pressure passage is a passage from the evaporator 7 to the suction by the compressor 2, and the high pressure passage means a passage from the discharge in the compressor 2 to the expansion valve 6. The compressor 2 is driven, for example, by transmitting the power of a crankshaft of the engine 10 via a belt.

As the compressor 2, it is desirable to use a variable displacement compressor capable of controlling the refrigerant discharge amount. When a variable displacement compressor is used as the compressor 2, the cooling / heating capacity is controlled by the discharge amount of the refrigerant, so that the power required by the compressor 2 can be reduced and the temperature in the passenger compartment can be adjusted efficiently. it can.

The main condenser 3 is disposed outside the vehicle compartment and radiates the heat of the high-temperature and high-pressure gas-phase refrigerant discharged from the compressor 2 to the outside air. The outside air is blown to the main condenser 3 by driving a blowing means 11 such as an electric fan. The main condenser 3 performs heat exchange between the high-temperature and high-pressure gas-phase refrigerant passing through the main condenser 3 and the outside air blown to the main condenser 3,
The heat of the high-temperature high-pressure gas-phase refrigerant is radiated to the outside air.

The sub-condenser 4 is disposed in a vehicle interior air flow path P1, which will be described later, and radiates heat of the high-temperature and high-pressure gas-phase refrigerant discharged from the compressor 2 to air flowing through the vehicle interior air flow path P1. Things. The air flowing through the vehicle interior air passage P1 is radiated by the sub-condenser 4 and absorbs heat of the refrigerant to become warm air and flow downstream of the vehicle interior air passage P1.

In the vehicle air conditioner 1 shown in FIG. 5, the sub capacitor 4 and the main capacitor 3 are connected in parallel, and the main capacitor 3 and the sub capacitor 4 are selectively used. It has become so. That is, the refrigerant flow path discharged from the compressor 2 joins the first refrigerant line L1 passing through the main condenser 3 and the second refrigerant line L2 via the three-way connector 43 via the three-way connector 43. It is supposed to.

In the first refrigerant line L 1, an electromagnetic valve 14 is provided before the main condenser 3, and a check valve 15 is provided after the main condenser 3. Similarly, the second
The solenoid valve 16 is also provided in the upstream of the sub-condenser 4 in the refrigerant line L2 of the
7 are provided. Then, the open / close state of the solenoid valve 14 provided in the first refrigerant line L1 and the second refrigerant line L
2 is switched by a control unit (not shown) that controls the operation of the entire air conditioner 1 for the first refrigerant line L <b> 1.
Alternatively, the second refrigerant line L2 is selected.

More specifically, during the cooling operation, the control unit controls the solenoid valve 1 provided in the first refrigerant line L1.
4 is set to “open”, and the solenoid valve 16 provided in the second refrigerant line L2 is set to “close”. Thus, the first refrigerant line L1 is selected, and the refrigerant discharged from the compressor 2 is supplied to the main condenser 3. On the other hand, during the heating operation, the control unit sets the solenoid valve 14 provided in the first refrigerant line L1 to “closed”, and sets the solenoid valve 16 provided in the second refrigerant line L2.
Set to “open”. Thereby, the second refrigerant line L
2 is selected and supplied to the refrigerant sub-condenser 4 discharged from the compressor 2.

As described above, in the vehicle air conditioner 1, the control unit functions as a switching means for selectively switching between the first refrigerant line L1 and the second refrigerant line L2, and is discharged from the compressor 2. The flow path of the cooled refrigerant is switched between a cooling operation and a heating operation, and the main condenser 3 and the sub condenser 4 are selectively used.

The liquid tank 5 includes the main condenser 3
Alternatively, the liquid refrigerant is temporarily kept at a low temperature due to heat radiation by the sub-condenser 4 and liquefied.
This liquid tank 5 includes a dust filter,
It also has a function of removing dust mixed in the held liquid-phase refrigerant. In addition, as shown in FIG. 5, it is disposed immediately after the main capacitor 3 or integrally with the main capacitor 3. In this case, the liquid refrigerant radiated and liquefied by the sub-condenser 4 is directly supplied to the expansion valve 6 without passing through the liquid tank 5. In the present embodiment, the liquid tank 5 is provided immediately after the main condenser 3, but may be provided between the three-way connector 13 and the expansion valve 6.

The expansion valve 6 rapidly expands the liquid-phase refrigerant that is radiated by the main condenser 3 or the sub-condenser 4 and temporarily held in the liquid tank 5,
The refrigerant is supplied to the evaporator 7 as a low-temperature and low-pressure mist-like refrigerant.

The evaporator 7 is disposed on the upstream side of the sub-condenser 4 in the vehicle interior air flow path P 1, and converts the heat of the air flowing through the vehicle interior air flow path P 1 into the low-temperature low-pressure air supplied from the expansion valve 6. The mist-like refrigerant absorbs heat. When the refrigerant supplied to the evaporator 7 as a low-temperature and low-pressure mist by the expansion valve 6 passes through the evaporator 7, it takes away heat of the air flowing through the vehicle interior air flow path P1 and evaporates. Then, the gas-phase refrigerant is sucked into the compressor 2, compressed again by the compressor 2 and discharged. On the other hand, the air absorbed by the refrigerant in the evaporator 7 becomes cold air and flows to the downstream side of the vehicle interior air flow path P1.

In the refrigeration cycle, the refrigerant is circulated as described above to perform heat exchange in the main condenser 3, the sub-condenser 4, and the evaporator 7, thereby generating warm air and cool air in the vehicle interior air flow path P1. Like that.

The hot water line circulates the engine cooling water to exchange heat using the engine cooling water which has become hot due to the exhaust heat of the engine 10. The heater core 21 as a heat generating means is incorporated in the hot water line. Have been.

The heater core 21 is disposed together with the sub-condenser 4 on the downstream side of the evaporator 7 in the vehicle interior air flow path P 1, and is a cooling water supplied from a water jacket of the engine 10 via a piping member, that is, The heat is generated by using the engine cooling water, which has been heated by the exhaust heat of the engine 10, as a heat source. The air flowing through the vehicle interior air passage P1 absorbs the heat from the heater core 21 in addition to the heat of the refrigerant radiated by the sub-condenser 4 described above. In addition, a water valve 22 is provided in a pipe member that supplies engine cooling water from the water jacket of the engine 10 to the heater core 21. The water valve 22 is adjusted under the control of the control unit described above. By doing so, the heater core 21
The flow rate of the engine cooling water supplied to the heater core 21, that is, the calorific value of the heater core 21 is adjusted.

By the way, in the vehicle air conditioner 1 of the present embodiment, the sub-condenser 4 which is a heat radiating vehicle interior heat exchanger is disposed at a position where it can receive heat from the heater core 21 which is a heat generating means. ing. Here, the position where the heat from the heater core 21 can be received is defined as the vehicle interior air flow path P.
1 means a position to which heat from the heater core 21 is transmitted even when no air is flowing. Specifically, for example, when the sub-condenser 4 is disposed at a position very close to the heater core 21 or when the sub-condenser 4 and the heater core 21 are integrally formed, the sub-condenser 4 21 can be received.

In the vehicle air conditioner 1 of the present embodiment,
As described above, the sub-condenser 4 which is a heat exchanger for heat radiation inside the vehicle is disposed at a position where heat from the heater core 21 which is a heat-generating means can be received. By increasing the temperature load of No. 4, the refrigerant discharge pressure (Pd) can be quickly increased, and extremely good rapid heating performance can be exhibited.

That is, when the heater core 21 is disposed downstream of the sub-condenser 4, the air introduced into the vehicle interior air flow path P 1 and passed through the evaporator 7, and the air which has been cooled is cooled by the sub-condenser 4. 4, the temperature load on the sub-condenser 4 is further reduced, and the refrigerant discharge pressure is unlikely to increase. On the other hand, when the heater core 21 is disposed upstream of the sub-condenser 4, the air cooled by the evaporator 7 hits the sub-condenser 4 via the heater core 21. Is not so low, and the refrigerant discharge pressure can be increased more quickly. Also, in this case, the heat of the heater core 21 can be transmitted to the sub-condenser 4 via the air flowing through the vehicle interior air flow path P1, so that the transmission efficiency of the heat transmitted from the heater core 21 to the sub-condenser 4 is improved. Is further improved, and more excellent rapid heating performance can be exhibited.

In order to further improve the rapid heating performance, it is desirable that the sub-condenser 4 which is a heat exchanger for heat radiation inside the vehicle and the heater core 21 which is a heat generating means have an integral structure. As described above, when the sub-condenser 4 and the heater core 21 are integrated, the heat from the heater core 21 is directly transmitted to the sub-condenser 4, and thus the heat transmitted from the heater core 21 to the sub-condenser 4 And further excellent rapid heating performance can be exhibited by further improving the transmission efficiency of the air.

The sub-condenser 4 and the heater core 21
If is integrated, it is very advantageous from the viewpoint of reducing the size and cost of the entire apparatus.

A blower fan 31 is provided on the upstream side of the vehicle interior air flow path P1. In the vehicle air conditioner 1, the blower fan 31, by being driven under the control of the control unit described above, outside air is introduced into the room air passage P1 from the outside air introduction port, or the inside air Inside air is introduced into the vehicle interior air passage P1 from the introduction port, and the outside air or the inside air flows through the vehicle interior air passage P1. An intake door 32 is provided in the vicinity of the outside air inlet and the inside air inlet, and the intake door 32 is driven under the control of the control unit, so that the inside of the vehicle interior air flow path P1 is formed. Outside air and inside air are selectively introduced.

The air (outside air or inside air) introduced into the vehicle interior air flow path P1 from the outside air introduction port or the inside air introduction port first passes through the evaporator 7 arranged on the upstream side of the vehicle interior air flow path P1. Will do. At this time, as described above, the air passing through the evaporator 7 absorbs the heat of the refrigerant in the evaporator 7 to become cool air and flow downstream.

In the passenger compartment air flow path P1, the evaporator 7
Downstream is a hot air flow path in which the heater core 21 and the sub-condenser 4 are disposed, and the heater core 21 and the sub-condenser 4
And a bypass flow path that bypasses the flow path. As described above, the air flowing through the hot air flow path absorbs heat from the heater core 21 when passing through the heater core 21, and further, when passing through the sub-condenser 4, the refrigerant in the sub-condenser 4 Then, the heat radiated from the air is absorbed and becomes warm air, and is flown to the downstream side. On the other hand, the air that has flowed into the bypass flow path flows downstream with the cool air absorbed by the refrigerant in the evaporator 7.

Here, at a branch point branched into the hot air flow path and the bypass flow path, air for adjusting the ratio of the flow rate of the air flowing through the hot air flow path to the flow rate of the air flowing through the bypass flow rate is provided. A mix door 33 is provided. In the air conditioner 1 for a vehicle, the air mixing door 33 is driven under the control of the control unit, and the flow rate of the air flowing through the hot air flow path and the flow rate of the air flowing through the bypass flow path are determined. By adjusting the ratio, finally, the temperature of the air blown out from the defroster outlet 35, the vent outlet 36, and the foot outlet 37 is adjusted.

In the vehicle air conditioner 1 configured as described above, in addition to the heater core 21 as the heat generating means, the sub-condenser 4 as the heat-radiating vehicle interior heat exchanger is provided in the vehicle interior air flow path P1. Since the hot air is produced not only by using the heater core 21 but also by using the sub-condenser 4, good heating performance can be obtained even when the temperature of the engine cooling water is not sufficiently high. Can be

The vehicle air conditioner 1 including the refrigeration cycle having the above-described structure and the hot water line includes a vehicle compartment unit 8 as shown in FIG. Indoor unit 8
Is provided with a blower fan 31, an evaporator 7, an air mix door 33, a heater core 21, a sub-condenser 4, and the like in a unit case 8A.

An expansion valve 6 is integrally provided on the refrigerant inlet side of the evaporator 7. A pipe 40 connected to the downstream side of the sub-condenser 4 from which the refrigerant flows out from the sub-condenser 4 side is connected to the three-way connector 13 on the refrigerant introduction side of the evaporator 7. This pipe 4
Numeral 0 is connected to the expansion valve 6 by a short pipe 45 connected to the three-way connector 13, and is connected to the introduction side of the evaporator 7 via the expansion valve 6. Also, the three-way connector 13
Is connected to a pipe 41 on the downstream side of the main condenser 3.

The outer pipe 15 of the double pipe 44 formed concentrically is connected to the side of the evaporator 7 where the refrigerant is discharged (downstream side). As shown in FIG. 5, the inner pipe 47 of the double pipe 44 is connected to a refrigerant line L2 through which the refrigerant discharged from the compressor 2 passes through a relatively high-pressure refrigerant transmitted through the three-way connector 12 and the electromagnetic valve 16. 1 and 2, as shown in FIG. 1 and FIG.
Is connected to the introduction side of the sub capacitor 4. In the present embodiment, one end of the double pipe 44 is fixed to the evaporator 7. A fixed block 48 is provided on the other end side of the double pipe 44, and the fixed block 48 is integrally provided with the pipe 41 connected to the discharge side of the main condenser 3. FIG. 5 shows a cross section of the fixed block 48. FIG. 6 is a perspective view of the double pipe 44. As shown in FIG.
Has a structure in which the inner pipe 47 is accommodated in the outer pipe 46, and a spacer 49 is formed between the outer peripheral surface of the inner pipe 47 and the inner peripheral surface of the outer pipe 46.

In the vehicle air conditioner 1 having such a configuration, in the mode mainly for cooling, the refrigerant discharged from the compressor 2 is supplied to the evaporator 7 through the pipe 41. At this time, the solenoid valve 16 is controlled to be in the “closed” state, and the circulation of the refrigerant to the sub-condenser 4 is stopped. Therefore, the supply of the refrigerant from the pipe 40 on the downstream side of the sub-condenser 4 to the evaporator 7 is not performed. At the same time, as shown in FIG.
2 is controlled to the “closed” state, and the circulation of the refrigerant to the heater core 21 is stopped. 1 and FIG.
Numerals 0 and 61 are pipes connected to the engine 10 that circulates hot water to the heater core 21.

In the air conditioner 1 for a vehicle, in the mode mainly for heating, the refrigerant supplied from the compressor 2 is supplied to the sub-condenser 4 via the inner pipe 47 of the double pipe 44, The refrigerant discharged from the evaporator 7 is supplied to the evaporator 7 through a pipe 40, and the refrigerant discharged from the evaporator 7 is sent out to the compressor 2 through an outer pipe 46 of the double pipe 44.

Although the first embodiment has been described above, in the first embodiment, as shown in FIG. 1, since the fixed block 48 integrally holds the double pipe 44 and the pipe 41, the vehicle It is only necessary to open one connection opening in the dash panel 50 that separates the vehicle compartment from the engine room, and achieves space saving of the connection space.
The connection workability with the pipe on the engine room side can be improved. A fixed block 48 is provided on the engine room side.
By preparing a connection block corresponding to the above, it is possible to perform quick and reliable pipe connection.

In the first embodiment, the relatively high-pressure refrigerant discharged from the compressor 2 is introduced into the inner pipe 47 of the double pipe 44, and the relatively low-pressure refrigerant discharged from the evaporator 7 is introduced into the outer pipe 46. Has the advantage that a gaseous refrigerant passage is ensured, and integration can be achieved while suppressing pressure loss.

Further, in the double pipe 44, the refrigerant supplied to the sub-condenser 4 and the refrigerant discharged from the evaporator 7 exchange heat, so that the heat efficiency can be increased and energy saving can be achieved. be able to.

(Embodiment 2) FIG. 8 shows a fixed block 48A of a double pipe 44 and a connection block 51 arranged on the engine room side in a vehicle air conditioner according to Embodiment 2 of the present invention. It is principal part sectional drawing. In the second embodiment, the inner pipe 47 of the double pipe 44 is provided to protrude inside the fixing block 48A. On the other hand, in the connection block 51 on the engine room side, an insertion portion 51a to be fitted into the opening 52 of the fixing block 48A is formed. Inside the insertion portion 51a, an end of a pipe 47A constituting a second refrigerant line is provided so as to protrude in an expanded shape. The pipe 47 </ b> A is provided coaxially inside the pipe 53 for flowing the refrigerant discharged from the evaporator 7 to the compressor 2. The pipe 47A and the pipe 53 are provided coaxially with a predetermined dimension, but branch off at a predetermined position.

In order to connect the fixed block 48A and the connection block 51, as shown in FIG.
The O-ring 54 is interposed closely on the outer periphery of the distal end of the connecting block 51, and the insertion portion 51a of the connection block 51 is fitted into the opening 52 of the fixed block 48A with the O-ring 55 interposed therebetween. The bolt holes 56 and 57 formed in 48A and 51 are aligned with each other and tightened with bolts and nuts.

The other configuration of the second embodiment is as follows.
The description is omitted because it is the same as the first embodiment.

In the second embodiment, the fixed block 4
By fitting 8A and the connection block 51,
Since the connection between the pipes 47A and 47 can be performed at the same time, the connection work becomes extremely easy. Therefore, according to the second embodiment, the connection operation cost can be further reduced.

(Embodiment 3) FIGS. 9 and 10 are cross-sectional views showing a main part of a vehicle air conditioner according to Embodiment 3 of the present invention.

In the third embodiment, as shown in FIG. 9, a branch flow path 70 for supplying a refrigerant from the path of the inner pipe 47 to the expansion valve 6 is formed in the double pipe fixing portion 44A. Also,
The pipe 40 for sending the refrigerant discharged from the sub-condenser 4 is integrally connected to the fixed block 48B.
The connection block 51 is connected to the fixed block 48B.
Is connected to a pipe 41 connected to the pipe 40. A connecting protrusion 56 is provided on the fixed block 48B side, and the connecting protrusion 56 is fixed to the fixed block 48B.
Is fitted into the connection concave portion 57 formed at the bottom. In addition, the fixed block 4 is attached to the connection block 51A.
An insertion portion 51b to be fitted into the opening 52A of 8B is formed. Inside the insertion portion 51b, an end of a pipe 47A forming a second refrigerant line is provided so as to protrude in an expanded shape. The pipe 47 </ b> A is provided coaxially inside the pipe 53 for flowing the refrigerant discharged from the evaporator 7 to the compressor 2. The pipe 47A and the pipe 53 are provided coaxially with a predetermined dimension, but branch off at a predetermined position. The fixed block 48 </ b> B is integrally provided with pipes 60 and 61 for circulating hot water through the heater core 21. As shown in FIG. 10, the fixing block 48B and the connection block 51A are fixed by bolts and nuts.

The third embodiment has the advantage that the double pipe 53, the pipe 40 downstream of the sub-condenser 4, and the pipes 60 and 61 for circulating hot water can be connected at one time. In this way, by putting the piping together in a block,
The mounting hole opened in the dash panel can be reduced.

Although the embodiments have been described above, the present invention allows various design changes accompanying the gist of the configuration. For example, in each of the above-described embodiments, the heat exchange is possible between the inner pipe 47 and the outer pipe 46 by using the double pipe 44, but the two pipes are brought close to each other so as to be heat-exchangeable and integrally held. It may be. Further, the first flow path (L1)
The configuration of the second flow path (L2) is not limited to the above-described configuration example.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of a vehicle air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a side view showing a main part of the vehicle air conditioner according to the first embodiment.

FIG. 3 is a perspective view showing a main part of the vehicle air conditioner according to the first embodiment.

FIG. 4 is a plan view showing a main part of the vehicle air conditioner according to the first embodiment.

FIG. 5 is an explanatory view showing the entire vehicle air conditioner according to the first embodiment.

FIG. 6 is a cross-sectional view of a fixed block of the vehicle air conditioner according to Embodiment 1.

FIG. 7 is a perspective view of a double pipe used in the first embodiment.

FIG. 8 is a second embodiment of the vehicle air conditioner according to the present invention.
It is principal part sectional drawing which shows.

FIG. 9 is a third embodiment of the vehicle air conditioner according to the present invention.
FIG.

FIG. 10 is a sectional view showing a main part of a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 4 Subcondenser 6 Expansion valve 7 Evaporator 8 Car interior side air conditioning unit 21 Heater core 40, 41, 42 Piping 44 Double piping 46 Outer piping 47 Inner piping 48 Fixed block 51 Connection block

Claims (11)

[Claims] 1. A vehicle air conditioner (1) comprising: a first refrigerant passage (L1); and a second refrigerant passage (L2) having two branched passages. An air conditioner for a vehicle, wherein a refrigerant passage (L1) and one of the second refrigerant passages (L2) are formed coaxially. 2. A refrigeration cycle including a compressor (2), a radiator (3) discharged from the compressor (2), an expansion device (6), a heat absorption device (7), and the compressor (2). During the suction circulation to the at least two refrigerant passages (L1, L
In a vehicle air conditioner (1) having a cycle of branching and merging into 2), a common low-pressure path after heat absorption and a pipe (47, 42) of any one of the refrigerant passages are formed coaxially. An air conditioner for a vehicle, comprising: 3. The vehicle according to claim 1, wherein the coaxially formed passages are such that an outer passage is a low-pressure passage during a cycle and an inner passage is a high-pressure passage. Air conditioner. 4. The refrigerant discharged from the compressor (2) is sequentially introduced into the heat absorbing indoor heat exchanger (7) through the vehicle exterior heat exchanger (3) and the expansion valve (6), and the heat absorption is performed. A first refrigerant passage (L1) for circulating a refrigerant discharged from the indoor heat exchanger (7) to the compressor (2) and a refrigerant discharged from the compressor (2) are sequentially radiated to the heat exchanger. (4) The refrigerant introduced into the indoor heat exchanger for heat absorption (7) through the expansion valve (6) and the refrigerant discharged from the indoor heat exchanger for heat absorption (7) is circulated to the compressor (2). An air conditioner (1) for a vehicle, comprising: a second refrigerant passage (L2); a refrigerant supply pipe (47) for supplying a refrigerant to the indoor heat exchanger (4) for heat dissipation; A refrigerant discharge pipe (46) for discharging refrigerant from the indoor heat exchanger (7) is Vehicle air conditioning apparatus characterized by phased. 5. The refrigerant discharged from the compressor (2) is sequentially introduced into a heat-absorbing indoor heat exchanger (7) through a vehicle exterior heat exchanger (3) and an expansion valve (6), and the heat absorption is performed. A first refrigerant passage (L1) for circulating a refrigerant discharged from the indoor heat exchanger (7) to the compressor (2) and a refrigerant discharged from the compressor (2) are sequentially radiated to the heat exchanger. (4) The refrigerant introduced into the indoor heat exchanger for heat absorption (7) through the expansion valve (6) and the refrigerant discharged from the indoor heat exchanger for heat absorption (7) is circulated to the compressor (2). A second refrigerant passage (L2) for supplying a refrigerant from the exterior heat exchanger (3) to the interior heat exchanger (7). The refrigerant is discharged from the refrigerant supply pipe (42) and the heat absorbing indoor heat exchanger (7). A refrigerant discharge pipe (46), the air conditioner for a vehicle, characterized in that integrated. 6. The refrigerant supply pipe (47) and the refrigerant discharge pipe (46) are coaxial double pipes (44), according to claim 4 or claim 5. Vehicle air conditioner. 7. The refrigerant supply pipe (47) according to claim 4, wherein the refrigerant supply pipe (47) is disposed along the axial direction within the refrigerant discharge pipe (46). Vehicle air conditioner. 8. One end of the double pipe (44)
The air conditioner for a vehicle according to claim 6 or 7, wherein an outer pipe is formed so that a flow path direction is bent in a direction perpendicular to the double pipe (44). . 9. The indoor heat exchanger for heat absorption (7) and the indoor heat exchanger for heat dissipation (4) are housed in the same unit (8). Item 8
An air conditioner for a vehicle according to any one of the above. 10. The vehicle according to claim 6, wherein the double pipe (44) is disposed in a heat absorbing indoor heat exchanger (7). Air conditioner. 11. The heat-radiating indoor heat exchanger (4) is a sub-condenser (4) arranged near a heater core (21).
An air conditioner for a vehicle according to any one of the above.