JPH06262936A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To shorten the starting time of a heater by feeding the refrigerant discharged from a compressor, to which a liquid tank is separably connected, to a heat exchanger, and by heating the cooling water to be fed to a heater core. CONSTITUTION:When a heater is to be started during cold season, a compressor 10 is driven by an engine, while three-way valves 24, 25, 27 are switched to fixed directions. The refrigerant of high temperature and high pressure discharged from the compressor 10 is fed to a liquid tank 12 through a heat exchanger 22. The refrigerant vapor existing in the gas phase part of a liquid tank 12 is sucked to the compressor 10. Namely, the sufficient amount of refrigerant vapor is fed to the compressor 10. The refrigerant vapor of sufficiently high temperature and high pressure is fed from the compressor 10, while the heated water fed from a water jacket 14 is heated at the heat exchanger 22 and is fed to a heater core 7. The air for air conditioning is thus sufficiently heated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicle air conditioner for cooling and heating the interior of a vehicle, and is capable of quickly heating the interior of the vehicle during cold weather.

[0002]

2. Description of the Related Art An air conditioner for an automobile for heating, cooling, and dehumidifying an interior of an automobile has conventionally been provided with an evaporator for cooling an air and an air as disclosed in Japanese Utility Model Laid-Open No. 62-156512. BACKGROUND ART Air conditioners for automobiles, which are combined with a heater core for heating, are widely used.

This air conditioner for automobiles, which has been widely known from the past, is constructed as shown in FIG. 5, for example. An inside air intake 2 and an outside air intake 3 are provided at the upstream end of the duct 1, and one of the intakes 2 (or 3) is provided by an inside / outside air switching door 4 provided at a branch of both intakes 2 and 3. ) Can be freely communicated with the duct 1. A blower 5 and an evaporator 6 are provided on the downstream side of the inside / outside air switching door 4 in the duct 1 in order from the inside / outside air switching door 4 side. A heater core 7 and a bypass passage 8 are provided in parallel with each other on the downstream side of the evaporator 6. An air mix door 9 is provided on the upstream side of the heater core 7 and the bypass passage 8 so that the ratio of air flowing through the heater core 7 and the bypass passage 8 can be adjusted.

A refrigerant or hot water can be circulated between the evaporator 6 and the heater core 7 by a circuit as shown in FIG. 6 to cool or add air passing through the evaporator 6 or the heater core 7. I try to warm it up.

In FIG. 6, reference numeral 10 denotes a compressor for compressing a refrigerant. The high-temperature and high-pressure refrigerant discharged from the compressor 10 is condensed and liquefied by exchanging heat with air while passing through the condenser 11. And liquid tank 12
Stored in. The refrigerant sent from the liquid tank 12 rapidly expands by passing through the expansion valve 13, is then sent into the evaporator 6, evaporated in the evaporator 6, and then returned to the compressor 10. Since the liquid refrigerant evaporates in the evaporator 6, the temperature of the evaporator 6 is lowered. Therefore, if air is passed through the evaporator 6, the air can be cooled or dehumidified. The opening degree of the expansion valve 13 is adjusted by the refrigerant temperature at the outlet of the evaporator 6.

On the other hand, the engine water jacket 14
The cooling water (warm water), which is stored in the inside and whose temperature has risen by cooling the engine, is sent to the radiator 15 by a water pump (not shown), and part of it is sent to the heater core 7. As a result, the temperature of the heater core 7 rises, so that the air can be heated by passing the air through the heater core 7.

An air conditioner for a vehicle, in which an evaporator 6 and a heater core 7 for cooling or heating air as shown in FIG. 6 are arranged in a duct 1 as shown in FIG. Is stopped, hot water is supplied to the heater core 7 or stopped, and the position of the air mix door 9 is adjusted, so that a desired air conditioning condition can be established in the interior of the automobile.

For example, when heating the interior of an automobile,
By stopping the compressor 10, the evaporator 6
The cooling medium is stopped from being fed into the heater core 7, the temperature-increased cooling water is fed into the heater core 7, the air mix door 9 is switched to the state shown by the chain line in FIG. 5, and the air flowing through the duct 1 passes through the heater core 7. Like When lowering the heating temperature, the air mix door 9 is moved slightly to the position indicated by the solid line to allow a part of the air to pass through the bypass passage 8.

[0009]

By the way, in the air conditioner for a vehicle configured and operating as described above, it takes a long time for the driver to sufficiently raise the temperature of the vehicle interior during cold weather, and I had to put up with it for a relatively long time.

That is, in order to circulate the cooling water of the automobile engine through the heater core 7 which heats the air for heating,
If the temperature of this cooling water does not rise sufficiently, a sufficient heating effect cannot be obtained. However, when the outside air temperature is low, such as in winter, it takes a long time for the temperature of the cooling water to rise to such an extent that a sufficient heating effect can be obtained, and the occupant must feel cold during that time.

In the heat pump type heating device used as a home heater, the electric heating heater is used as an auxiliary heater to shorten the heating start-up time (time required to obtain a feeling of heating). However, it is generally performed, but in the case of a heating system for an automobile, it is not possible to use an electric heater which puts an excessive burden on the battery.

The vehicle air conditioner of the present invention was invented in view of the above-mentioned circumstances, and is intended to shorten the heating start-up time without burdening the battery.

[0013]

SUMMARY OF THE INVENTION An air conditioner for a vehicle according to the present invention includes a heater core for heating air by performing heat exchange between hot water and air whose temperature has risen in a water jacket of an engine. , A heat exchanger that heats the hot water sent to the heater core by exchanging heat between the high-temperature and high-pressure refrigerant vapor discharged from the compressor, the refrigerant inlet to the vapor phase portion, and the refrigerant outlet. To the liquid phase part respectively, the liquid refrigerant discharged from the compressor and condensed by passing through the condenser,
The liquid tank includes a liquid tank that receives the refrigerant from the inlet and temporarily stores it, and an evaporator that evaporates the liquid refrigerant sent from the refrigerant outlet of the liquid tank and then sends the liquid refrigerant to the compressor. Then, at the time of heating rising, to the heat exchanger, while allowing high-temperature and high-pressure refrigerant discharged from the compressor to be freely sent, the liquid tank is arranged in parallel to the closed circuit in which the refrigerant flows at the time of heating rising, and the refrigerant outlet is The refrigerant inlets are provided on the upstream side so as to face the downstream side, respectively, and can communicate with the closed circuit and can be cut off.

[0014]

The air conditioner for an automobile of the present invention constructed as described above acts as follows to shorten the heating start-up time. That is, when heating is started in cold weather,
First, the compressor is operated with the liquid tank connected in the closed circuit. As a result, in the liquid refrigerant accumulated in the liquid tank, the high-temperature and high-pressure refrigerant vapor discharged from the compressor is fed, the evaporation of the liquid refrigerant is promoted, and in the closed circuit including the compressor,
There will be a sufficient amount of refrigerant vapor.

If a sufficient amount of refrigerant vapor is present in the closed circuit after a short time has elapsed after the compressor is started, the liquid tank is disconnected from the closed circuit and the compressor is connected to the heat exchanger. The high-temperature and high-pressure refrigerant discharged from As a result, the cooling water (hot water) sent to the heater core exchanges heat with the high-temperature and high-pressure refrigerant in the heat exchanger to increase its temperature, and the temperature rise of the heater core is accelerated.

Further, as a result of operating the compressor, the load on the engine increases, the amount of fuel sent to the engine also increases, and the amount of heat generated by this engine also increases, so that the cooling water stored in the water jacket ( The temperature rise of (hot water) becomes even faster. As a result, the temperature rise of the heater core is accelerated, and the heating rise time can be shortened.

[0017]

FIG. 1 shows a first embodiment of the present invention corresponding to claim 2. At the cooling water outlet of the water jacket 14 for cooling the engine, a hot water delivery pipe 16
One end of the hot water delivery pipe 16 to the other end,
It communicates with the hot water inlet of the heater core 7. The heater core 7 is arranged in the duct 1 for circulating the air for air conditioning, as shown in FIG. 5, like the conventional air conditioning apparatus for automobiles described above. Then, the other end of the warm water return pipe 17 having one end communicating with the warm water outlet of the heater core 7 is communicated with the cooling water inlet of the water jacket 14.

The refrigerant discharged from the compressor 10 which is driven by the engine and compresses the refrigerant is the condenser 1
After being condensed by 1, it is once stored in the liquid tank 12. The refrigerant inlet 18 and the refrigerant outlet 19 of the liquid tank 12 are open to the vapor phase portion and the liquid phase portion, respectively. The liquid refrigerant sent out from the refrigerant outlet 19 passes through the expansion valve 20 and then is sent to the evaporator 6 arranged in the duct 1. Then, by evaporating in the evaporator 6, the temperature of the evaporator 6 is lowered. The refrigerant evaporated in the evaporator 6 is returned to the compressor 10 again through the refrigerant return pipe 21.

A heat exchanger 22 is provided in the middle of the hot water delivery pipe 16 in series with the hot water delivery pipe 16. The heat exchanger 22 is the same as the water jacket 14 described above.
Water (cooling water) sent out from the compressor and the compressor 1
The hot water sent from the water jacket 14 to the heater core 7 is heated by exchanging heat with the high-temperature and high-pressure refrigerant discharged from 0. The refrigerant never condenses in the heat exchanger 22.

A first three-way valve 24, which is a first refrigerant flow path selecting means, is provided in the middle of a pipe 23 for sending the refrigerant discharged from the compressor 10 to the condenser 11, and is discharged from the compressor 10. Sent refrigerant to the refrigerant inlet of the heat exchanger 22 or the condenser 1
Either one of the refrigerant is sent to the refrigerant inlet.

A second three-way valve 25, which is a second refrigerant flow path selecting means, is provided in the middle of the refrigerant return pipe 21.
The suction port of the compressor 10 is connected to the evaporator 6
Of the refrigerant outlet of the heat exchanger 22 and the refrigerant outlet of the heat exchanger 22 can be selectively communicated with each other.

In the middle of the pipe 26 connecting the second three-way valve 25 and the refrigerant outlet of the heat exchanger 22, a third three-way valve 27, which is a third refrigerant flow path selecting means, and a flow path area An adjustable throttle valve 28 is provided in this order from the heat exchanger 22 side. Then, by adjusting the flow passage area of the throttle valve 28 therein, the amount of the refrigerant sent to the compressor 10 can be adjusted. Further, the third three-way valve 27 and the refrigerant outlet 19 of the liquid tank 12 are connected to the pipe 29.
Connected by.

On the other hand, a sensor 30 for detecting the temperature and pressure of the refrigerant flowing through the pipe 23 is provided at the upstream end of the pipe 23 so that the temperature and pressure of the refrigerant immediately after being discharged from the compressor 10 can be detected. I am trying. Further, a similar sensor 32 is provided in the middle of the pipe 31 connecting the second three-way valve 25 and the suction port of the compressor 10 so that the temperature and pressure of the refrigerant sent to the compressor 10 can be detected.

The temperature and pressure of the refrigerant detected by these sensors 30 and 32 are input to a controller 33 for controlling the throttle valve 28. The controller 33 controls the throttle valve 28 when the temperature and pressure of the refrigerant are high.
To reduce the amount of the refrigerant sent to the compressor 10 or prevent the liquid refrigerant from being sent to the suction port of the compressor 10 by supplying a sufficient amount of refrigerant vapor. Control to discharge from.

Further, the other end of the pipe 34, one end of which is connected to the intermediate portion of the pipe 26 between the throttle valve 28 and the second three-way valve 25, is connected to the refrigerant inlet 18 of the liquid tank 12. Connected.

When the vehicle air conditioner of the present invention configured as described above is used to start heating in cold weather, the compressor 10 is driven by the engine and the first, second, and third directions are used. Valves 24, 25, 27
Switching is performed in the direction of the solid arrow in FIG. Each of these three-way valves 2
The high-temperature and high-pressure refrigerant discharged from the discharge port of the compressor 10 in accordance with the switching of 4, 25, and 27 in the direction of the solid line arrow passes through the heat exchanger 22 and then enters the liquid tank 12. It is sent from the refrigerant outlet 19 side of 12. As a result, evaporation of the liquid refrigerant stored in the liquid tank 12 is promoted, and a large amount of refrigerant vapor is generated in the upper part of the liquid tank 12.

On the other hand, the suction port of the compressor 10 is
Since it communicates with the refrigerant inlet 18 of the liquid tank 12 through the second three-way valve 25 and the pipe 34, the liquid tank 12 is accompanied by the operation of the compressor 10.
The refrigerant vapor existing in the gas phase portion inside is sucked into the compressor 10. Therefore, by operating the compressor 10 by switching the first, second, and third three-way valves 24, 25, 27 in the directions of the solid arrows in FIG.
A sufficient amount of the refrigerant vapor is sent to 0, and the refrigerant vapor is adiabatically compressed by the compressor 10 to raise its temperature and then sent to the heat exchanger 22.

As a result, a sufficiently high temperature, high pressure refrigerant vapor is sent out from the compressor 10, the temperature of the heat exchanger 22 is sufficiently raised, and the water jacket 14 is heated.
The hot water sent out from the hot water sending-out pipe 16 is heated when passing through the heat exchanger 22, and then sent into the heater core 7. As shown in FIG. 5, the heater core 7 is arranged in the duct 1 for circulating the air for air conditioning, so that the hot water whose temperature has risen by passing through the heat exchanger 22 is heated by the heater core 7. By distributing to
The air for conditioning the air flowing through the duct 1 is sufficiently heated, and the temperature in the vehicle compartment is rapidly increased. The cooling water (hot water) that has passed through the heater core 7 is returned to the water jacket 14 of the engine. As described above, in the automobile air conditioner of the present invention, when the heating is started, the refrigerant circulates in the closed circuit including the compressor 10 in a gas state and heats the hot water sent to the heater core 7.

After a short time has passed after the start of the compressor 10, the refrigerant vapor existing in the closed circuit becomes sufficiently large, so that only the third three-way valve 27 is switched from the direction of the solid line arrow to the direction of the broken line arrow. . As a result, the heat exchanger 2
The refrigerant vapor discharged from the second refrigerant outlet is directly sucked into the suction inlet of the compressor 10 without passing through the liquid tank 12. Since the refrigerant vapor returned to the compressor 10 does not pass through the liquid tank 12,
The temperature of the refrigerant vapor reaching the suction port of the compressor 10 becomes higher, the temperature of the refrigerant vapor sent from the compressor 10 to the heat exchanger 22 becomes higher, and the temperature of the hot water sent to the heater core 7 can be made higher. Like

Further, in the case of the automobile air conditioner of the present invention, as a result of operating the compressor 10 by the engine, the load on the engine increases and the amount of fuel sent to the engine also increases, so that the heat generation amount of this engine increases. To do.
Therefore, the temperature rise of the cooling water (warm water) stored in the water jacket 14 is further accelerated. As a result, the temperature of the heater core 7 rises faster, and the heating rise time can be shortened.

As described above, by operating the compressor 10 at the start of heating to heat the cooling water (hot water) sent to the heater core 7, it is possible to shorten the time required for sufficient heating. On the other hand, when the temperature of the cooling water (hot water) sent to the heater core 7 rises, the temperature and pressure of the refrigerant that exchanges heat with the cooling water (hot water) also rises. If the temperature and pressure of the refrigerant rise excessively, the durability of the components of the vapor compression refrigerator including the compressor 10 may be impaired.

In such a case, the compressor 1 is used as it is.
If the heating of the cooling water (warm water) by the refrigerant is stopped by stopping 0, no particular problem occurs. However, according to the calculation by the present inventor, before the temperature of the cooling water (warm water) has risen sufficiently. It was also found that the pressure of the refrigerant was too high. Therefore,
In the illustrated embodiment, if the temperature of the cooling water (hot water) is insufficient for sufficient heating, but if the temperature of the cooling water rises excessively as it is, the throttle valve Cooling water (hot water) by the refrigerant by narrowing the flow path of 28 and reducing the amount of the refrigerant sent to the compressor 10.
While continuing the heating, the increase in the pressure of the refrigerant is suppressed.

That is, when it is determined that the pressure of the refrigerant discharged from the compressor 10 becomes too high based on the signals from the sensors 30 and 32, the controller 33 narrows the passage of the throttle valve 28. If the flow path of the throttle valve 28 becomes narrow and the amount of the refrigerant passing through the compressor 10 becomes small, it is possible to prevent the above pressure from rising excessively and impairing the durability of the constituent members of the vapor compression refrigerator. Moreover, even if the flow path of the throttle valve 28 is narrowed, the cooling water (warm water) is continuously heated by the refrigerant, so that the temperature of the cooling water (warm water) is maintained at a level necessary for sufficient heating. It can be raised in a short period of time.

As described above, when the compressor 10 is operated to obtain a rapid heating effect, and as a result, the temperature in the vehicle compartment rises sufficiently, the compressor 10 is stopped and, if necessary, the first, Second three-way valve 24, 2
5 is switched to the direction indicated by the chain line arrow in FIG. 1 (the third three-way valve 27 is the broken line direction), and the sending of the refrigerant to the heat exchanger 22 is stopped. In this state, the vehicle air conditioner of the present invention operates in the same manner as the conventional vehicle air conditioner shown in FIG. 6 to heat the interior of the vehicle.

If the compressor 10 is operated with the first and second three-way valves 24 and 25 switched to the chain line arrow state, the temperature of the evaporator 6 is lowered to cool or dehumidify the interior of the automobile. I can do it. In the case of cooling, it goes without saying that a hot water valve (not shown) provided in the middle of the hot water delivery pipe 16 is closed to stop the supply of hot water to the heater core 7. The three-way valves 24, 25, 27 provided for switching the flow paths may be replaced by combining a plurality of opening / closing valves that switch simultaneously.

Next, FIG. 2 shows a second embodiment of the present invention, which corresponds to claim 3. In the case of the present embodiment, a first refrigerant flow path selecting means is provided in the middle of the pipe 23 connecting the discharge port of the compressor 10 and the refrigerant inlet of the condenser 11.
A four-way valve 35 is provided. Then, the discharge port of the compressor 10 is connected to the liquid tank 1 by the four-way valve 35.
The second refrigerant outlet 19, the refrigerant inlet of the condenser 11, and the refrigerant inlet of the heat exchanger 22 are selectively communicable with each other.

When heating is started, first, the four-way valve 35 and the second three-way valve 25 are switched in the direction of the solid line arrow in FIG. 2, and the compressor 10 is driven. As a result, the high temperature and high pressure refrigerant discharged from the compressor 10 is blown into the liquid refrigerant stored in the liquid tank 12 to evaporate the liquid refrigerant. A relatively large amount of the refrigerant vapor generated as a result of this is introduced from the refrigerant inlet 18 into the pipe 3
It is sucked into the suction port of the compressor 10 through the fourth and second three-way valves 25. As a result, a large amount of refrigerant vapor is sent in a short time in the closed circuit that includes the compressor 10 and circulates the refrigerant vapor.

When a sufficient amount of refrigerant vapor is sent to the closed circuit flow after a short time has passed after the compressor 10 is started, the four-way valve 35 is switched in the direction of the broken line arrow in FIG. As a result, the high-temperature and high-pressure refrigerant vapor discharged from the compressor 10 is sent to the heat exchanger 22,
The hot water passing through the heat exchanger 22 is heated.

If the temperature of the hot water sent to the heater core 7 rises sufficiently with the operation of the compressor 10, the compressor 10 is stopped and the four-way valve 35 and the second three-way valve 25 are connected to the chain line in FIG. Switch in the direction of the arrow.
In this state, the heat exchanger 22 does not heat the hot water. If the compressor 10 is operated in this state,
It can dehumidify and cool the car interior. Other configurations and operations are similar to those of the above-described second embodiment.

Next, FIG. 3 shows a third embodiment of the present invention, which corresponds to the third aspect. In the case of the present embodiment, the refrigerant inlet 18 of the liquid tank 12 and the second three-way valve 25 are
A pipe 37 having an on-off valve 36 on the way and a throttle valve 2 on the way
It communicates with the piping 26 which has 8.

Immediately after the start of heating, the compressor 10
When a sufficient amount of refrigerant vapor is taken into a closed circuit including the above, the four-way valve 35 and the second three-way valve 25 are switched in the direction of the solid line arrow, and the compressor 10 is opened with the open / close valve 36 open. drive. When heating the hot water in the heat exchanger 22 part after taking in a sufficient amount of the refrigerant vapor, only the four-way valve 35 is switched to the direction of the broken line arrow, and the compressor 10 is operated with the on-off valve 36 closed. . Other configurations and operations are similar to those of the above-described second embodiment.

Next, FIG. 4 shows a fourth embodiment of the present invention, which corresponds to the fourth aspect. A discharge port of the compressor 10 is connected to a first three-way valve 24 provided in the middle of the pipe 23,
One of the refrigerant inlet of the condenser 11 and the branch pipe 38 can be selectively communicated with. In the middle of the branch pipe 38, the first three-way valve 24 is selectively connected to one of the refrigerant outlet 19 of the liquid tank 12 and the refrigerant inlet of the heat exchanger 22 to select a third refrigerant passage. A third three-way valve 39, which is a means, is provided. Further, an opening / closing valve 41 is provided in a refrigerant pipe 40 that connects the refrigerant inlet 18 of the liquid tank 12 and the refrigerant inlet of the heat exchanger 22.

Immediately after the start of heating, the compressor 10
In the case where a sufficient amount of refrigerant vapor is taken into a closed circuit including the first, second, and third three-way valves 24, 25,
39 is switched in the direction of the solid arrow, and the compressor 10 is operated with the on-off valve 41 open. In addition, when the hot water is heated in the heat exchanger 22 part after taking in a sufficient amount of the refrigerant vapor, the third three-way valve 39 is switched in the direction of the broken line arrow, and the compressor 10 is closed with the opening / closing valve 41 closed. drive. Other configurations and operations are similar to those in the above-described embodiments.

[0044]

Since the air conditioner for a vehicle of the present invention is constructed and operates as described above, it is possible to shorten the time required to raise the temperature in the vehicle compartment during cold weather, which is long for passengers. You will no longer have to be patient.

Incidentally, in Japanese Patent Application No. 3-89103, the first,
An invention relating to an air conditioner for a vehicle, in which heat is exchanged between a refrigerant and hot water (cooling water) by a second heat exchanger, is described. In the case of the automotive air conditioner according to this previous invention, in the first heat exchanger portion, heat is exchanged between the high-temperature and high-pressure refrigerant discharged from the compressor and the hot water sent to the heater core to heat the hot water. The refrigerant is condensed, and heat is exchanged between the warm water sent from the heater core and the refrigerant in the second heat exchanger portion to evaporate the refrigerant.

In the case of the present invention, the heat quantity is exchanged between the refrigerant and the hot water, and the temperature of the hot water is raised by the difference between them, so that the heat exchange in the first and second heat exchanger parts is performed. The amount increases. Further, since the refrigerant exchanges heat with the hot water while changing the phase of the refrigerant, the temperature difference between the hot water and the refrigerant is reduced, and it may be impossible to obtain sufficient heat exchange efficiency. Therefore, in the case of the prior invention, in order to obtain sufficient performance, it is necessary to make the first and second heat exchangers large.

On the other hand, in the case of the vehicle air conditioner of the present invention, the heat quantity is unilaterally supplied from the refrigerant to the hot water by the single heat exchanger. Therefore, the amount of heat exchange between the refrigerant and the hot water does not increase excessively. Moreover, since the heat exchange between the refrigerant and the hot water is performed by sensible heat without phase change, the temperature difference between the refrigerant and the hot water can be increased to improve the heat exchange efficiency. Therefore, the automobile air conditioner of the present invention can be made smaller and have higher performance than the automobile air conditioner of the previous invention.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a fourth embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing an example of the configuration of an automobile air conditioner to which the present invention is applied.

FIG. 6 is a circuit diagram of a conventional device.

[Explanation of symbols]

 1 Duct 2 Inside air intake 3 Outside air intake 4 Inside / outside air switching door 5 Blower 6 Evaporator 7 Heater core 8 Bypass passage 9 Air mix door 10 Compressor 11 Condenser 12 Liquid tank 13 Expansion valve 14 Water jacket 15 Radiator 16 Hot water delivery pipe 17 Hot water return Pipe 18 Refrigerant inlet 19 Refrigerant outlet 20 Expansion valve 21 Refrigerant return pipe 22 Heat exchanger 23 Piping 24 First three-way valve 25 Second three-way valve 26 Piping 27 Third three-way valve 28 Throttle valve 29 Piping 30 Sensor 31 Piping 32 Sensor 33 Controller 34 Piping 35 Four-way valve 36 Open / close valve 37 Piping 38 Branch piping 39 Third three-way valve 40 Refrigerant piping 41 Open / close valve

Claims (5)

[Claims] Claim: What is claimed is: 1. By exchanging heat between hot water and air whose temperature has risen in a water jacket of an engine,
A heater core that heats this air, a heat exchanger that heats this hot water by exchanging heat between the high-temperature high-pressure refrigerant vapor discharged from the compressor and the hot water sent to the heater core, and the refrigerant inlet To the gas phase portion, the refrigerant outlet is opened to the liquid phase portion, respectively, the liquid refrigerant discharged from the compressor and condensed by passing through the condenser is received from the refrigerant inlet and temporarily stored, and a liquid tank, Equipped with an evaporator that evaporates the liquid refrigerant sent from the refrigerant outlet of the liquid tank and then sends it to the compressor, and at the start of heating, allows the high-temperature and high-pressure refrigerant discharged from the compressor to be freely sent. , The liquid tank is connected in parallel to the closed circuit in which the refrigerant flows when the heating starts, and the refrigerant is Mouth upstream, toward each refrigerant inlet downstream, and comprising disposed for free communication and disassociate with the closed circuit, the air-conditioner for vehicle. 2. The air conditioner for a vehicle according to claim 1, comprising the constituent features shown in the following (a) to (wa). (A) A water jacket that cools the engine with the cooling water stored inside. (B) A hot water delivery pipe with one end communicating with the cooling water outlet of this water jacket. (C) A heater core disposed in a duct that communicates the air for air conditioning with the hot water inlet communicating with the other end of the hot water delivery pipe. (D) A hot water return pipe having one end connected to the hot water outlet of the heater core and the other end connected to the cooling water inlet of the water jacket. (E) A compressor that is driven by the engine to compress the refrigerant. (F) A condenser that condenses the refrigerant discharged from this compressor. (G) An evaporator that is arranged in the duct to evaporate the refrigerant sent from the condenser and then return it to the compressor. (H) A heat exchanger that is provided in the middle of the hot water delivery pipe and heats the hot water by exchanging heat between the hot water delivered from the water jacket and the refrigerant discharged from the compressor. (I) A liquid tank which is provided between the condenser and the evaporator and has a refrigerant inlet communicating with a refrigerant outlet of the condenser in a vapor phase portion and a refrigerant outlet communicating with a refrigerant inlet of the evaporator in a liquid phase portion. (E) A first refrigerant flow path selecting means for selectively communicating the discharge port of the compressor with either the refrigerant inlet of the heat exchanger or the refrigerant inlet of the condenser. (L) Second refrigerant flow path selecting means for selectively communicating the suction port of the compressor with one of the refrigerant outlet of the evaporator and the refrigerant outlet of the heat exchanger. (2) The refrigerant outlet of the heat exchanger is provided between the refrigerant outlet of the heat exchanger and the second refrigerant passage selecting means, and the refrigerant outlet of the heat exchanger is connected to the second refrigerant passage selecting means and the refrigerant outlet of the liquid tank. Third refrigerant flow path selecting means for selectively communicating with one of the two. (W) A refrigerant pipe for connecting the refrigerant inlet of the liquid tank and the second refrigerant flow path selecting means. 3. The air conditioner for an automobile according to claim 1, comprising the following constituent features (f) to (ヰ). (F) A water jacket that cools the engine with the cooling water stored inside. (Y) A hot water delivery pipe with one end communicating with the cooling water outlet of this water jacket. (T) A heater core disposed in a duct that communicates the air for air conditioning with the other end of the hot water delivery pipe communicating with the hot water inlet. (H) A hot water return pipe having one end connected to the hot water outlet of the heater core and the other end connected to the cooling water inlet of the water jacket. (So) A compressor that is driven by the engine to compress the refrigerant. (T) A condenser that condenses the refrigerant discharged from this compressor. (Iv) An evaporator that is arranged in the duct to evaporate the refrigerant sent from the condenser and then return the refrigerant to the compressor. (A) A heat exchanger that is provided in the middle of the hot water delivery pipe and heats the hot water by exchanging heat between the hot water delivered from the water jacket and the refrigerant discharged from the compressor. (A) A liquid tank which is provided between the condenser and the evaporator and has a refrigerant inlet communicating with a refrigerant outlet of the condenser in a vapor phase portion and a refrigerant outlet communicating with a refrigerant inlet of the evaporator in a liquid phase portion. (M) First refrigerant flow path selecting means for selectively communicating the discharge port of the compressor with any one of the refrigerant outlet of the liquid tank, the refrigerant inlet of the condenser, and the refrigerant inlet of the heat exchanger. (C) Second refrigerant flow path selecting means for selectively communicating the suction port of the compressor with one of the refrigerant outlet of the evaporator and the refrigerant outlet of the heat exchanger. (ヰ) Refrigerant piping for connecting the refrigerant inlet of the liquid tank and the second refrigerant flow path selecting means. 4. The air conditioner for an automobile according to claim 1, comprising the constituent features shown in the following (No) to (Y). (No) A water jacket that cools the engine with the cooling water stored inside. (E) A hot water delivery pipe with one end communicating with the cooling water outlet of this water jacket. (H) A heater core disposed in a duct that communicates air for air conditioning with the other end of the hot water delivery pipe communicating with the hot water inlet. (Y) A hot water return pipe having one end connected to the hot water outlet of the heater core and the other end connected to the cooling water inlet of the water jacket. (M) A compressor that is driven by the engine to compress the refrigerant. (K) A condenser that condenses the refrigerant discharged from this compressor. (F) An evaporator which is arranged in the duct to evaporate the refrigerant sent out from the condenser and then return it to the compressor. (C) A heat exchanger that is provided in the middle of the hot water delivery pipe and heats the hot water by exchanging heat between the hot water delivered from the water jacket and the refrigerant discharged from the compressor. (D) A liquid tank provided between the condenser and the evaporator, in which a refrigerant inlet communicating with a refrigerant outlet of the condenser is opened in a vapor phase portion, and a refrigerant outlet communicating with a refrigerant inlet of the evaporator is opened in a liquid phase portion. (E) A first refrigerant flow path selecting means for selectively communicating the discharge port of the compressor with one of the refrigerant inlet of the condenser and the branch pipe. (A) Second refrigerant flow path selecting means for selectively communicating the suction port of the compressor with one of the refrigerant outlet of the evaporator and the refrigerant outlet of the heat exchanger. (3) A third refrigerant which is provided in the middle of the branch pipe and selectively communicates the first refrigerant flow path selecting means with one of the refrigerant outlet of the liquid tank and the refrigerant inlet of the heat exchanger. Flow path selection means. (G) Refrigerant piping that connects the refrigerant inlet of the liquid tank and the refrigerant inlet of the heat exchanger. (U) An on-off valve provided in the middle of this refrigerant pipe. 5. The air conditioner for an automobile according to claim 2, which has the constituent features shown in the following (m) to (c). (B) A throttle valve having a freely adjustable flow passage area, which is provided in the middle of a pipe that communicates with a suction port of a compressor through a second coolant flow passage selecting means and flows a refrigerant from a heat exchanger to the compressor. (D) A sensor that detects at least one of the temperature and pressure of the refrigerant flowing while passing through the compressor. (4) A controller that narrows the flow path of the throttle valve when the temperature or pressure of the refrigerant detected by the sensor is high.