JP2000043558A - Air conditioner for vehicle provided with cold storage unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a cold accumulation unit, and to eliminate the flat battery during the heat radiation by installing a cold accumulation unit to which a refrigerant system provided with an evaporator for cooling and dehumidifying is connected by passing an expansion valve and the evaporator to make an effective use of a vehicle body space. SOLUTION: A liquid refrigerant which is high in temperature and pressure and vacuum-expanded in an expansion valve is changed into a liquid refrigerant which is low in temperature and pressure is fed to an evaporator, and exchanges the heat with air to effect the cooling and dehumidifying. A refrigerant bypass flow path to lead the liquid refrigerant high in temperature and pressure to a cold accumulation unit 20 is branched between a dryer and the expansion valve. A refrigerant pipe bypassed from an air-conditioning unit 1 is arranged along an air-conditioning duct 7, and connects the cold accumulation unit 20 to the air-conditioning unit. Since the cold accumulation unit 20 is located on a roof of the vehicle body, the vehicle body space can be effectively used, and the air supply function is unnecessary since the natural phenomenon can be used during the heat radiation, and the battery run-down can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner which is installed in a vehicle such as a bus and cools a vehicle compartment, and more particularly to a vehicle air conditioner having a cool storage unit.

[0002]

2. Description of the Related Art A vehicle air conditioner capable of providing a comfortable cabin environment for passengers and passengers by air-conditioning the cabin of a bus or the like can perform a cooling operation and a heating operation. In the cooling operation, the conditioned air cooled and dehumidified by exchanging heat with the refrigerant by passing through the evaporator is blown through a cooling duct installed in the vehicle compartment by the operation of the blower, and each air blower provided in the cooling duct is blown. It is blown out from the exit toward the passenger compartment. A refrigerant system that supplies a low-temperature and low-pressure liquid refrigerant to the evaporator compresses a low-temperature and low-pressure gas refrigerant into a high-temperature and high-pressure gas refrigerant by a compressor, and sends the gas refrigerant to a condenser to be cooled by outside air. The refrigerant condensed in the condenser is separated into gas and liquid by the receiver, and the liquid refrigerant is sent from the receiver to the expansion valve and decompressed and expanded to become a low-temperature and low-pressure liquid refrigerant, which constitutes a refrigeration cycle that is supplied to the evaporator again. I have. In the heating operation, engine cooling water is introduced into the heater core as a heating source, and air heated through the heater core is blown through a heating duct installed in the vehicle interior by the operation of the blower, and is provided in the heating duct. The air is blown out from each outlet into the passenger compartment. Some route buses adopt a system in which a plurality of radiators installed at appropriate places in a vehicle compartment are connected to directly circulate engine cooling water.

There are two types of air conditioners installed in buses: a sub-engine type mainly used for large sightseeing buses and a direct connection type mainly used for route buses and small buses. In the sub-engine system, an engine (sub-engine) dedicated to an air conditioner is provided separately from an engine for driving the vehicle (main engine). It is configured to drive. In the case of the sub-engine system, main devices such as a sub-engine and a compressor are unitized, and are usually installed in a space below the passenger compartment in the center of the vehicle body. On the other hand, a direct connection type vehicle air conditioner obtains a driving force from a traveling engine of a vehicle to a refrigerant compressor or the like, similarly to a passenger car or the like. In the case of a route bus, the compressor is installed near the engine at the rear of the vehicle body, and the evaporator and the condenser are often installed on the roof of the vehicle body. In the case of a small bus, the compressor is installed near the engine at the front of the body, the condenser is located below the cabin in the center of the car, and the evaporator is located above the cabin (ceiling) at the rear of the car.
Often installed in. In the case of a bus, cooling ducts (cooling ducts) are usually arranged near the left and right ceilings in the passenger compartment, and heating ducts (heating ducts) are usually set near the left and right floors in the passenger compartment. .

[0004] In order to cope with recent environmental problems, it is desired to stop the idling of the engine in a parking lot or the like. Particularly, in parking lots at tourist spots and the like, idling stop regulations are sometimes enforced from the viewpoint of protecting the natural environment. For this reason, for example, the air conditioning system of a sightseeing bus cannot be operated while waiting for a passenger in a summer parking lot, regardless of whether it is a sub-engine system or a direct connection system. Problem. In order to cope with such a problem, a cold storage system has been developed in which excess heat can be accumulated by utilizing excess refrigeration capacity during cooling operation. This cold storage system is configured such that cold storage panels filled with a cold storage material are arranged in parallel at a predetermined interval, and a refrigerant is introduced from a refrigerant system into a cold storage unit whose outside is surrounded by a heat insulating material such as glass wool. In addition, when the air conditioner is stopped, the temperature rise in the vehicle compartment can be suppressed by releasing the cold stored in the cold storage material.

FIG. 7 schematically shows a refrigerant system having the above-described regenerative unit. In the figure, reference numeral 10 denotes a refrigerant system, 11 denotes a compressor, 12 denotes a condenser, 13 denotes a cooling / cooling storage switching solenoid valve, 14 denotes an expansion valve, 15 denotes an evaporator, 1
6 is a backflow prevention solenoid valve, and 20 is a cold storage unit. The cold storage unit 20 is provided between the condenser 12 and the expansion valve 14, and is provided in a refrigerant bypass passage 17 that joins between the evaporator 15 and the compressor 11. In the illustrated refrigerant system 10, the refrigerant circulates counterclockwise as indicated by the arrow, and is opened and closed by opening and closing the cooling / cooling storage switching electromagnetic valve 13.
Switching between a cooling operation in which the refrigerant passes through the expansion valve 14 and the evaporator 15 and a cooling operation in which the refrigerant bypasses the expansion valve 14 and the evaporator 15 and passes through the cold storage unit 20 are performed.

As a result, during normal cooling operation, the cooling / cooling switching electromagnetic valve 13 can be fully opened, and the air passing by the refrigerant supplied to the evaporator 15 can be cooled and dehumidified. In addition, when the interior of the vehicle interior drops to a desired temperature and there is a surplus in the refrigerating capacity, the cooling / cooling storage switching electromagnetic valve 13 is fully closed. Thereby, the refrigerant cools the cold storage material through the cold storage unit 20, so that cold heat is accumulated in the cold storage material. The backflow prevention solenoid valve 16 is provided for the purpose of preventing the refrigerant from flowing backward toward the cold storage unit 20 when switching from the cold storage operation to the cooling operation. Sometimes it is fully closed.

FIG. 8 is a layout view when the cool storage unit 20 is installed on a large sightseeing bus. FIG. 9 is a front view of the air conditioning unit and the cool storage unit viewed from the side of the vehicle body. , 2 and 3 are air conditioning units 1
A refrigerant pipe (corresponding to the bypass passage 17 in FIG. 7) connecting between the air conditioner and the cool storage unit 20; 4 is a duct for introducing vehicle interior air; 4a is a cool air introducing duct; 5 is an air conditioning duct; A storage unit, 7 is a cooling duct, 8a and 8b are cooling / cold storage switching dampers, and 1a is a blower for blowing air. The heating duct branched from the cooling / heating switching damper storage unit 6 is not shown.

In this case, during normal cooling operation, the blower 1
The air in the cabin is sucked by the operation of a, and is guided to the air conditioning unit 1 through the introduction duct 4. At this time,
Both the cold storage switching dampers 8a and 8b have their inlets and outlets closed so that the introduced air in the passenger compartment does not pass through the cold storage unit 20. The introduced air that has been air-conditioned by passing through the evaporator in the air-conditioning unit 1 is guided to the cooling / heating switching damper storage unit 6 by the air-conditioning duct 5, and the cooling / heating switching damper here closes the heating duct side. And flows out of each outlet into the vehicle interior.

On the other hand, when the cool heat of the cool storage unit 20 is released, the air in the passenger compartment is also sucked by the operation of the blower 1a.
b are both opened and closed so that the introduced air in the vehicle compartment passes through the cool storage unit 20. Then, the air sucked from the passenger compartment is cooled by passing through the cold storage unit 20, guided to the cold storage air introduction duct 4 a, and enters the air conditioning unit 1.
At this time, since the supply of the refrigerant to the evaporator of the air conditioning unit 1 has been stopped, the cold storage air simply passes through the evaporator, and is then guided to the cooling / heating switching damper storage unit 6 by the air conditioning duct 5 in the same manner as during normal cooling operation. Then, the air flows further into the cooling duct 7 and flows out of each outlet into the vehicle interior.

[0010]

As described above, the conventional cold storage unit 20 is installed together with the air conditioning unit 1 in the space below the passenger compartment in the center of the vehicle body in the case of a large sightseeing bus. This space is usually used as a trunk room to store passenger luggage, but the size of the body is limited, so if a cold storage unit is installed here, the space that can be used as a trunk room will be reduced. Will occur. For a large sightseeing bus, the inability to secure a sufficient trunk room volume is disadvantageous in terms of commerciality.

Further, at the time of cooling from the regenerative unit, it is necessary to operate the blower 1a of the air conditioning unit 1 to blow cool air. Therefore, when the main engine and the sub engine are stopped, the power source of the battery must be used. Therefore, when the cooling time is long, the problem of running out of the battery occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to effectively utilize a limited space of a vehicle body to incorporate a cold storage unit, and to solve the problem of running out of battery when cooling from the cold storage unit.

[0013]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. An air conditioner for a vehicle including the cold storage unit according to claim 1, a compressor that compresses a low-temperature and low-pressure gas refrigerant, a condenser that cools a high-temperature and high-pressure gas refrigerant supplied from the compressor with outside air, A receiver that separates the refrigerant condensed by the condenser into gas and liquid, an expansion valve that decompresses and expands the liquid refrigerant sent from the receiver, and a low-temperature and low-pressure liquid refrigerant from the expansion valve that exchanges heat with the air in the passenger compartment. A cooling system comprising an evaporator for cooling and dehumidifying the cooling system, comprising a regenerative unit connected to bypass the expansion valve and the evaporator, and the regenerative unit is installed on the roof of the vehicle body, Is what you do.

According to the vehicle air conditioner provided with such a cold storage unit, the vehicle body space can be effectively used, and the cold air that has been stored can fall naturally into the passenger compartment.

According to a second aspect of the present invention, there is provided a vehicle air conditioner having a regenerative storage unit, comprising: a compressor for compressing a low-temperature and low-pressure gas refrigerant; and a condenser for cooling the high-temperature and high-pressure gas refrigerant supplied from the compressor with outside air. And a receiver for separating the refrigerant condensed by the condenser into gas and liquid; an expansion valve for reducing and expanding the liquid refrigerant sent from the receiver; and an air in the vehicle cabin receiving the low-temperature and low-pressure liquid refrigerant from the expansion valve. A refrigerant system comprising an evaporator for cooling and dehumidifying by heat exchange,
A cooling unit is connected to the expansion valve and the evaporator by bypassing the cooling unit, and the cooling unit is installed in a cooling duct for guiding cool air into a vehicle compartment.

According to the vehicle air conditioner provided with such a cool storage unit, the vehicle body space can be effectively used, and the cool air that has been stored can fall naturally into the passenger compartment almost uniformly and efficiently.

According to a third aspect of the present invention, there is provided an air conditioner for a vehicle provided with a cool storage unit, wherein the cool storage unit naturally drops cool air and releases the cool air into a vehicle compartment.

According to the vehicle air conditioner provided with such a cold storage unit, no power is required to release the cold air stored in the vehicle compartment.

A vehicle air conditioner having a cool storage unit according to a fourth aspect of the present invention is characterized in that the cool storage unit includes a cooling fan driven by a solar cell.

According to the vehicle air conditioner provided with such a cold storage unit, the driving power of the engine or the power supply of the battery is not required to release the cold air stored in the vehicle compartment.

According to a fifth aspect of the present invention, there is provided an air conditioner for a vehicle including a cool storage unit, wherein the cool storage unit includes a cooling fan driven by an external power supply.

According to the air conditioner for a vehicle having such a cold storage unit, it is not necessary to use a driving force of an engine or a power source of a battery to cool the stored cold air into a vehicle compartment, and a relatively large air flow is required. Fans can be used.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention, and show an example in which a sub-engine type vehicle air conditioner installed in a large sightseeing bus has a cool storage unit. FIG. 1 is a perspective view showing an outline of a sightseeing bus, in which an air conditioning unit 1 is installed below a passenger compartment in the center of a vehicle body, and an air conditioning duct 5 connected to the air conditioning unit 1 is mounted in a cooling / heating switching damper storage unit 6. Cooling duct 7 going to the upper part of the room
And a heating duct 9 directed toward the floor of the passenger compartment. The air conditioning unit 1 is a unit in which a refrigerant system such as a compressor driven by a sub engine, a heater core, and the like are unitized. The refrigerant pipe bypassed from the air-conditioning unit 1 is connected, for example, along the cooling duct 7 to connect the refrigerant pipe to the cold storage unit 20 installed on the roof of the vehicle body.

FIG. 2 shows the structure of a refrigerant system 10 having the above-described regenerative storage unit 20. During a normal cooling operation, the compressor 11 is operated by using the sub engine 11a as a drive source, and the low-temperature low-pressure gas refrigerant is operated. Compress. The high-temperature and high-pressure gas refrigerant is sent to the condenser 12 and exchanges heat with the outside air. As a result, the high-temperature and high-pressure gas refrigerant is cooled and condensed, further sent to the receiver 18 to separate gas and liquid, and the high-temperature and high-pressure liquid refrigerant is guided to the expansion valve 14 via the dryer 19. The high-temperature and high-pressure liquid refrigerant decompressed and expanded in the expansion valve 14 is supplied to the evaporator 15 as a low-temperature and low-pressure liquid refrigerant, and is sucked by the blower 1a to exchange heat with air passing through the evaporator 15 to be cooled and dehumidified. The refrigerant that has become a low-temperature and low-pressure gas refrigerant due to this heat exchange returns to the compressor 11 and is compressed again. Thereafter, such a clockwise circulation is repeated to form a refrigeration cycle.

On the other hand, between the dryer 19 and the expansion valve 14, a refrigerant bypass passage 17 for introducing a high-temperature and high-pressure liquid refrigerant to the regenerator unit 20 is provided in a branched manner. Further, a cooling / cooling storage switching electromagnetic valve 13 for switching the refrigerant flow path between a normal cooling operation and a cold storage operation described later is provided. The cold storage unit 20 includes a plurality of cold storage panels 21 filled with cold storage material arranged at predetermined intervals. In the illustrated case, three cold storage panels 21 are provided as one unit, and a cold storage electromagnetic valve 22 is provided at a refrigerant inlet. A total of 12 cold storage panels are arranged in parallel in 4 units. Then, a solenoid valve 22 for cold storage is provided at a refrigerant inlet of each cold storage panel 21.
An expansion valve 23 is provided on each downstream side of the cold storage panel 21, the cold storage electromagnetic valve 22, and the expansion valve 23.
The whole is surrounded by a heat insulating material 24 such as glass wool.
The refrigerant that has cooled the cold storage material by passing through each cold storage panel 21 is returned to the upstream side of the compressor 11, but prevents the refrigerant from flowing back to the cold storage unit 20 when switching from the cold storage operation to the cooling operation. A backflow prevention solenoid valve 16 is provided for the purpose.

The cold storage unit 20 thus configured
Is installed on the roof of the vehicle body, so that the limited vehicle body space can be effectively used. The cool storage unit 20 closes the cooling / cool storage switching solenoid valve 13 from fully open to fully closed when a surplus occurs in the normal cooling operation, that is, when the vehicle interior is sufficiently cooled to a predetermined air conditioning temperature. The solenoid valve 22 for cold storage and the solenoid valve 1 for backflow prevention
6 is switched from fully closed to fully open, and a high-temperature and high-pressure liquid refrigerant supplied from the receiver 18 and passed through the dryer 19 is introduced. The high-temperature and high-pressure liquid refrigerant introduced into the cold storage unit 20 is decompressed and expanded by the expansion valve 23 to become a low-temperature and low-pressure liquid refrigerant, and cools the cold storage material when passing through the cold storage panel 21. Is accumulated. When the normal cooling operation is required again, for example, when the temperature in the passenger compartment becomes higher than a predetermined value, the cooling / cooling switching electromagnetic valve 13 is switched from fully closed to fully opened, and the cooling / cooling electromagnetic valve 22 and the backflow prevention are controlled. The electromagnetic valve 16 is switched from fully open to fully closed, and the refrigerant flow path is switched so that the refrigerant flows through the expansion valve 14 and the evaporator 15. The switching between the cooling operation and the cold storage operation performed by opening and closing each of the above-described solenoid valves is generally performed based on data input from a temperature sensor or the like disposed at an appropriate position, based on air conditioning (not shown). Processed by the control unit of the device.

Next, the cooling operation of the above-described cool storage unit 20 will be described. This cooling operation is performed by the sub engine 1
This operation is performed when the operation of the vehicle 1a cannot be performed, and when it is desired to prevent or minimize the temperature rise in the vehicle compartment. In the cool storage unit 20, the inside of the heat insulating material 24 and the cooling duct 7 are in communication. This communication portion may be provided with an opening / closing damper that opens during the cooling operation as required. During the cooling operation, the cold accumulated in the cold storage material cools the surrounding air, and the low-temperature air (cool air) CA naturally falls into the vehicle interior through the communication part and the cooling duct 7. It is possible to prevent a temperature rise in the room.
This utilizes the natural phenomenon that the colder air becomes heavier and accumulates in the lower part, and is made possible by installing the cold storage unit 20 at a position higher than the compartment to be cooled (on the roof of the vehicle body). And does not require a special blowing mechanism. Therefore, in a situation where the sub-engine 11a cannot be operated, there is no need to use a blower fan which only depends on the power supply of the battery, and there is no need to worry about running out of the battery.

Further, because of the above-described natural fall phenomenon of the cool air CA, even when it is necessary to provide a blower fan so that the cool air CA is more evenly dispersed in the vehicle cabin, the capacity of the cool air CA is smaller than that of the blower from below. What is necessary is just to install the small blowing fan 25. Therefore, for example, it is also possible to install a solar cell on the roof of a vehicle body or the like and operate the electric motor with the solar cell. If you do this,
Again, there is no need to worry about running out of the battery, and it is possible to distribute the cool air to each outlet of the cooling duct 7 and allow it to be cooled in the vehicle interior. Moreover, the small blower fan 25 does not require a large space for its installation, and thus has a high degree of freedom in design.

Alternatively, a fan operated by an external power supply may be used as the blower fan 25 during the cooling operation described above. In this case, an outlet or a plug that can be connected to an external power supply may be provided at an appropriate position on the vehicle body, and the blower fan 25 may be operated by receiving an appropriate power supply at a parked place. In this way, the cool air CA can be distributed more evenly by using the blower fan 25 having a larger blowing capacity without worrying about running out of the battery.

Next, an example in which a direct connection type vehicle air conditioner installed on a route bus is provided with a cool storage unit will be described with reference to FIGS. 3 and 4. FIG. Here, reference numeral 30 denotes a refrigerant system, E
Is a running engine, 31 is a compressor, 32 is a condenser unit, 33 is a cooling / cooling switching solenoid valve, 34 is an expansion valve, 35 is an evaporator unit, and 36 is a backflow prevention solenoid valve. In this case, the refrigerant system 30 has two systems, left and right, and two compressors 31 are installed at the rear of the vehicle body adjacent to the traveling engine E and driven by the belt 31a. The condenser unit 32 and the evaporator unit 35 are both installed on the roof of the vehicle body. Further, the cold storage unit 20 is also installed on the roof of the vehicle body in the same manner as described above, and the condenser unit 3 is located from the front of the vehicle body.
2. The evaporator unit 35 and the cold storage unit 20 are arranged in this order.

Therefore, the compressor 31 at the rear of the vehicle body, the condenser unit 32 installed on the roof, and the evaporator unit 35 are connected by refrigerant piping. During normal cooling operation, the cooling / cooling switching solenoid valve 33 is operated. When fully opened, the cold storage solenoid valve 22 and the backflow prevention solenoid valve 36 are fully closed, and the refrigerant passes through the expansion valve 34 and the evaporator unit 35 to exchange heat with the air in the vehicle compartment. Also, during the cold storage operation, the cooling / cooling switching electromagnetic valve 33 is changed from fully open to fully closed,
Then, the cool storage solenoid valve 22 and the backflow prevention solenoid valve 36 are switched from the fully closed state to the fully opened state, so that the refrigerant bypasses the expansion valve 34 and the evaporator unit 35 and is guided to the cool storage unit 20 via the refrigerant bypass passage 37. I will As a result, the refrigerant cools the cold storage material in the cold storage panel 21 and causes the cold storage unit 20 to store cold heat.

During the cooling operation, the cool air CA that has fallen naturally is dispersed in the vehicle interior by the cooling duct 7 during the cooling operation, as in the case of the above-described sub-engine system. Can be prevented. Also in this case, since the cold storage unit 20 is installed on the roof, the limited space of the vehicle body can be effectively used. If necessary, a blower fan 25 using a solar cell as a power supply may be provided. A fan 25 may be provided.

FIGS. 5 and 6 show a second embodiment of the present invention, which differs from the first embodiment in that the cold storage unit 20 is disposed inside the cooling duct 7. FIG. In this embodiment,
The cold storage panel 21 is long along the cooling duct 7 in the front-rear direction of the vehicle body, and it is not necessary to surround the entire cold storage panel 21 with the heat insulating material 24. The refrigerant system in this case is the same as that shown in FIGS. 2 and 4, and therefore, detailed description thereof is omitted here. The basic configuration of the cold storage unit 20 is the same as that described above except for the heat insulating material 24. And the arrangement of such a cold storage unit 20 is as follows.
It goes without saying that the present invention can be applied not only to the air conditioner of the sub-engine type shown in FIG. 6 but also to the air conditioner of the direct connection type. Rather, when applied to the direct connection system in which the condenser unit 32 and the evaporator unit 35 are installed on the roof, the piping of the refrigerant bypass passage 37 for guiding the refrigerant to the cold storage panel 21 in the cooling duct 7 can be shortened, and Setting of the piping route is also easy. In FIG. 6, the piping of the refrigerant flow path for cooling the cold storage material through the cold storage panel 21 is not shown, and the symbol S indicates a passenger seat.

With such a structure, the limited space of the vehicle body can be effectively used, and since the cooling air naturally falls over the entire length of the cooling duct 7,
Even cooling can be easily performed in the vehicle interior. If necessary, a blower fan powered by a solar cell may be provided at an appropriate location, or an appropriate outlet or plug may be attached so that external power can be supplied. A ventilation fan may be provided.

[0035]

According to the present invention described above, the following effects can be obtained. According to the air conditioner for a vehicle including the cool storage unit according to the first aspect, the cool storage unit can be installed by effectively using the limited space of the vehicle body. Therefore, if this is applied to a bus, a large trunk room is provided. Can be
In addition, even in a place where the idling stop regulation is enforced, the temperature rise in the passenger compartment can be prevented by cooling from the regenerative storage unit. In addition, since the cool storage unit is installed at a position higher than the compartment to be cooled, it can be cooled by the natural fall of cold air to prevent the temperature from rising, and there is no need to worry about running out of battery due to the drive of the blower fan. There is also.

According to the vehicle air conditioner provided with the cool storage unit according to the second aspect, the cool storage unit can be installed by effectively using the limited space of the vehicle body. Can be provided, and even in a place where the idling stop regulation is implemented, the temperature rise in the vehicle compartment can be prevented by cooling from the regenerative storage unit.
In addition, since the regenerative storage unit is installed in the cooling duct, the temperature of the battery can be prevented from rising due to the natural fall of the cool air, and the temperature can be efficiently prevented by the natural fall of the cool air. There is also an effect.

According to the vehicle air conditioner having the cool storage unit according to the third aspect, a blower fan is not required to cool the stored cool air into the vehicle interior, and therefore no power such as a battery is required. is there. For this reason, it is possible to make the regenerative storage system compact, and it is possible to increase the degree of freedom in design and arrangement.

According to the vehicle air conditioner having the cool storage unit according to the fourth aspect, it is not necessary to use the driving power of the engine or the power supply of the battery to cool the stored cool air into the vehicle interior. Therefore, there is no need to worry about running out of the battery due to cooling, and moreover, the cold air can be widely distributed in the vehicle interior.

According to the vehicle air conditioner having the cool storage unit of the present invention, it is not necessary to use the driving power of the engine or the power supply of the battery to cool the stored cool air into the vehicle interior. A large blower fan can be used. Therefore, there is no need to worry about running out of the battery due to cooling, and moreover, it is possible to distribute the cold air widely and securely in the vehicle interior.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a vehicle air conditioner including a cool storage unit according to the present invention, showing a case of a sub-engine type.

FIG. 2 is a diagram showing a configuration of a refrigerant system including the cold storage unit of FIG.

FIG. 3 is a perspective view showing a first embodiment of a vehicle air conditioner including a cool storage unit according to the present invention, showing a case of a direct connection type.

FIG. 4 is a diagram showing a configuration of a refrigerant system including the cold storage unit of FIG. 2;

FIG. 5 is a perspective view showing a second embodiment of a vehicle air conditioner including a cold storage unit according to the present invention, showing a case of a sub-engine type.

FIG. 6 is a cross-sectional view of a main part taken along line AA of FIG. 5;

FIG. 7 is a configuration diagram illustrating an outline of a refrigerant system including a cold storage unit.

FIG. 8 is a perspective view showing an arrangement of a vehicle air conditioner including a conventional cool storage unit.

FIG. 9 is a front view of the air conditioning unit and the cool storage unit of FIG. 8 as viewed from the side of the vehicle body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning unit (sub engine system) 7 Cooling duct 10,30 Refrigerant system 11,31 Compressor 12,32 Capacitor (condenser unit) 13,33 Cooling / cooling storage switching solenoid valve 14,34 Expansion valve 15,35 Evaporator (Evaporator unit) ) 16,36 Backflow prevention solenoid valve 17,37 Refrigerant bypass passage 18 Receiver 20 Cold storage unit 25 Blower fan

Claims (5)

[Claims] 1. A compressor for compressing a low-temperature and low-pressure gas refrigerant, a condenser for cooling a high-temperature and high-pressure gas refrigerant supplied from the compressor with outside air, and a receiver for separating the refrigerant condensed by the condenser into gas and liquid. And an expansion valve that reduces and expands the liquid refrigerant sent from the receiver, and an evaporator that receives the low-temperature and low-pressure liquid refrigerant from the expansion valve and exchanges heat with air in the passenger compartment to cool and dehumidify the liquid refrigerant. The refrigerant system is
A vehicle air conditioner comprising a cold storage unit, comprising: a cold storage unit connected to bypass the expansion valve and the evaporator; and the cold storage unit is installed on a roof of a vehicle body. 2. A compressor for compressing a low-temperature and low-pressure gas refrigerant, a condenser for cooling a high-temperature and high-pressure gas refrigerant supplied from the compressor with outside air, and a receiver for separating the refrigerant condensed by the condenser into gas and liquid. And an expansion valve that reduces and expands the liquid refrigerant sent from the receiver, and an evaporator that receives the low-temperature and low-pressure liquid refrigerant from the expansion valve and exchanges heat with air in the passenger compartment to cool and dehumidify the liquid refrigerant. The refrigerant system is
A vehicle air conditioner comprising a cold storage unit, comprising: a cold storage unit connected by bypassing the expansion valve and the evaporator; and the cold storage unit is installed in a cooling duct that guides cool air into a vehicle compartment. 3. The cool storage unit according to claim 1, wherein the cool air naturally drops the cool air and cools the cool air into a vehicle interior.
A vehicle air conditioner comprising the regenerative storage unit according to claim 1. 4. The air conditioner for a vehicle having a cool storage unit according to claim 1, wherein the cool storage unit includes a cooling fan driven by a solar cell. 5. The air conditioner for a vehicle including a cool storage unit according to claim 1, wherein the cool storage unit includes a cooling fan driven by an external power supply.