JP2009154804A - Vehicular air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve on-vehicle mountability, and to reduce cost, in a vehicular air conditioner having the function of continuing cooling when stopping a refrigerating cycle. <P>SOLUTION: This vehicular air conditioner has an air conditioning unit 1 mounted with an evaporator 3, a refrigerating cycle 30 including the evaporator 3 and circulating a refrigerant in order of a compressor 31, a condenser 32, an expansion valve 34 and the evaporator 3, a pressure reducer 35 arranged in parallel to the expansion valve 34 so that a high pressure refrigerant on the condenser 32 side can be supplied to the evaporator 3 side by reducing pressure when stopping driving of the compressor 31 in the refrigerating cycle 30, and a cold storage tank 7 connected between the evaporator 3 and the compressor 31 in the refrigerating cycle 30, arranged in a casing of the air conditioning unit 1, formed so that the refrigerant can be stored and having a cold storage material for cooling the inside refrigerant. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner capable of continuing a cooling operation in a compressor stopped state.

In recent years, fuel efficiency of vehicles has advanced, and so-called idling stop control that automatically stops the engine when the vehicle is stopped may be performed.
During the idling stop control, the compressor driven by the engine in the refrigeration cycle is stopped and the refrigeration cycle is also stopped. Therefore, the vehicle air conditioner capable of continuing the cooling operation even in such a refrigeration cycle stopped state. Is required.

As a vehicle air conditioner that enables a cooling operation when the compressor is stopped, for example, the one described in Patent Document 1 is known.
In the vehicle air conditioner described in Patent Document 1, a cold storage heat exchanger is provided between the evaporator and the condenser of the refrigeration cycle outside the air conditioning unit, and the cold storage material of the cold storage heat exchanger is allowed to cool. A cold storage tank is provided for storing the refrigerant condensed at the time.

Therefore, when the drive of the compressor is stopped, the refrigerant absorbed and evaporated by the evaporator is condensed and liquefied by cooling from the regenerator material of the regenerator heat exchanger to reduce the refrigerant volume on the regenerator tank side. Since the evaporator side can be set to a lower pressure than the condenser side, the refrigerant on the condenser side flows into the evaporator side, and cooling by the evaporator can be continued.
JP 2007-1485 A

However, in the above-described conventional technology, the cold storage heat exchanger and the cold storage tank are provided outside the air conditioning unit. Therefore, when assembling to the vehicle body, it is necessary to connect these pipes. In addition, it is necessary to secure an installation space for the cold storage heat exchanger and the cold storage tank in the engine room, which is inferior to the vehicle-mounted property as compared with those not having them.
In addition, when there is a specification with a specification that has the function of continuing cooling when the refrigeration cycle is stopped and a specification that does not have depending on the vehicle, the vehicle body shape may differ depending on the specification in order to secure the installation space for the cold storage tank in the vehicle body. If this happens, the cost will increase significantly.

  The present invention has been made by paying attention to the conventional problems as described above, and is intended to improve in-vehicle performance and reduce costs in a vehicle air conditioner having a function of continuing cooling when the refrigeration cycle is stopped. Objective.

  In order to achieve the above-mentioned object, the invention according to claim 1 is configured such that air passing through the air passage is formed in a casing that forms an air passage in which air is directed from the suction port toward the air outlet that is communicated with the vehicle interior. An air conditioner unit on which an air blower and an evaporator for cooling the air are mounted, a refrigerating cycle including the evaporator, in which refrigerant circulates in the order of a compressor, a condenser, an expansion valve, and the evaporator, and in the refrigerating cycle, When the drive is stopped, the condenser-side high-pressure refrigerant is decompressed to the evaporator side so that it can be supplied, and a decompressor provided in parallel with the expansion valve, and connected between the evaporator and the compressor in the refrigeration cycle, and Installed in the casing and configured to store the refrigerant, It was a vehicle air-conditioning system, characterized in that comprises a cold storage tank having a cold accumulating material for cooling medium, the.

  According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the cold storage tank is formed in a flat cylindrical shape crushed in the direction perpendicular to the axis. The device.

  According to a third aspect of the present invention, in the vehicular air conditioner according to the first or second aspect, an inflow pipe into which refrigerant is introduced from the evaporator, and an outflow for sending the introduced refrigerant to the condenser The pipe is inserted into the cold storage tank with its tip directed downward in the direction of gravity, and the tip position of the inflow pipe is disposed at a position lower than the tip position of the outflow pipe. A vehicle air conditioner according to claim 1 or claim 2 is provided.

In the vehicle air conditioner of the present invention, during the operation of the refrigeration cycle driven by the compressor, the refrigerant circulates in the order of the compressor, the condenser, the expansion valve, the evaporator, and the cold storage tank.
At this time, in the cold storage tank, the cold storage material is cooled by the refrigerant that has passed through the evaporator, and is stored in the cold storage material.
After that, when the drive of the compressor is stopped, for example, when the vehicle is stopped, the refrigerant on the condenser side is supplied to the evaporator while being reduced in pressure through the decompressor due to the differential pressure due to the residual pressure, and further after passing through the evaporator , Flows into the cold storage tank. Then, in the cold storage tank, the cooling energy stored in the cold storage material liquefies the refrigerant vaporized by passing through the pressure reducer, and the volume is reduced. Thus, the movement of the refrigerant due to the residual pressure can be maintained for a long time, and the cooling state by the evaporator can be maintained.

Thus, in the vehicle air conditioner of the present invention that can maintain the cooling state after the compressor driving is stopped by the cold storage tank and the cold storage material, the cold storage tank is installed in the casing of the air conditioning unit.
Therefore, when the vehicle air conditioner of the present invention is mounted on a vehicle, the air conditioning unit is assembled to the vehicle body, so that the cold storage tank is also mounted on the vehicle, and the cold storage tank is installed outside the casing of the air conditioning unit as in the past. Compared to installing in the engine room, it is not necessary to assemble an independent cold storage tank or connect this cold storage tank to piping, and it is not necessary to secure the installation space for the cold storage tank in the vehicle body. Yes, excellent in-vehicle performance.
In addition, when setting a specification that has the function of continuing the cooling state when the compressor stops driving and a specification that does not have it, the difference in configuration due to the difference in specifications is the internal configuration of the air conditioning unit, such as the shape of the vehicle body side It can be shared, and it is easy to share the assembly work, which is advantageous in terms of cost.

  In the second aspect of the present invention, since the cold storage tank is formed in a flat cylindrical shape, it is possible to arrange the air-conditioning unit having a limited capacity so as not to be a resistance to air blowing, and the in-vehicle performance is further improved.

  In the invention according to claim 3, since the tip of the inflow pipe of the cold storage tank is arranged lower than the outflow pipe, the mist refrigerant sent from the evaporator becomes difficult to be sent directly to the compressor, and the cooling performance is stabilized. Can be achieved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The vehicle air conditioner according to the present embodiment has a casing (1c) that forms an air passage (18) in which air is directed from the inlet (11) to the air outlets (12a, 12b, 12c) communicated with the passenger compartment. ), An air conditioner unit (1) on which an air blower (4) that forms the air passing through the air passage (18) and an evaporator (3) that cools the air are mounted, and the evaporator (3), A refrigeration cycle (30) that circulates in the order of the compressor (31), the condenser (32), the expansion valve (34), and the evaporator (3), and in the refrigeration cycle (30), when the drive of the compressor (31) is stopped A decompressor (35) provided in parallel with the expansion valve (34) so that the high-pressure refrigerant on the condenser (32) side can be decompressed and supplied to the evaporator (3) side; In the cycle (30), the refrigerant is connected between the evaporator (3) and the compressor (31) and installed in the casing (1C), and is configured to be able to store the refrigerant. A vehicle air conditioner comprising: a cold storage tank (7) including a cold storage material (8a, 8b) to be cooled.

Below, based on FIGS. 1-4, the vehicle air conditioner A of Example 1 of the best embodiment of this invention is demonstrated.
FIG. 4 is an overall schematic diagram showing an outline of the configuration of the vehicle air conditioner A. The vehicle air conditioner A includes an air conditioner unit 1 installed in an instrument panel (not shown) and the air conditioner unit 1. A control unit 2 for controlling the operation is provided.

  The air-conditioning unit 1 is installed in an instrument panel (not shown), and a differential outlet 12a to which various ducts (not shown) connected to the vehicle interior are connected from an inlet 11 that can selectively introduce inside and outside air. A casing 1c in which a ventilation passage 18 extending to the foot outlet 12b and the vent outlet 12c is formed is provided.

  The blower passage 18 of the casing 1c includes, in order from the air blowing upstream side, a blower fan 4 that forms air blowing from the suction port 11 toward the air outlets 12a to 12c, an evaporator 3 that cools the air blowing, and a heater core that heats the air blowing 6 are installed.

  The evaporator 3 is one of the components of the refrigeration cycle 30 that circulates a known refrigerant. As shown in FIG. 1, the refrigeration cycle 30 includes a compressor 31 that is driven by a traveling engine or motor to compress refrigerant, a condenser 32 that cools high-pressure gaseous refrigerant to obtain a saturated liquid, A liquid tank 33 that performs gas-liquid separation and an expansion valve 34 that uses a refrigerant as low-temperature and low-pressure steam are provided. The refrigerant circulates in the order of the compressor 31, the condenser 32, the liquid tank 33, the expansion valve 34, and the evaporator 3. It is configured as follows.

  Further, in the first embodiment, in the refrigeration cycle 30, a decompressor 35 is provided in parallel with the expansion valve 34, and a cold storage tank 7 is provided between the evaporator 3 and the compressor 31.

The decompressor 35 has a function of maintaining the communication state between the condenser 32 side and the evaporator 3 side even when the expansion valve 34 is closed, and depressurizing and vaporizing the high-pressure refrigerant on the condenser 32 side. Specifically, in the expansion valve 34, it can be comprised by the groove | channel formed so that the upstream and downstream of the sealing position at the time of valve closing may be connected.
The cold storage tank 7 is arranged in parallel with the evaporator 3 in the casing 1c of the air conditioning unit 1 and is formed in a flat cylindrical shape.

  As shown in FIGS. 2 and 3, the cold storage tank 7 is formed in a double cylinder shape including an outer cylinder 71 and an inner cylinder 72 by extrusion molding, and the vertical direction of the vehicle is an action direction of gravity. It is arranged in a direction that substantially matches the direction.

As shown in FIG. 3, connecting plates 73 a, 73 b, 73 c that connect the outer cylinder 71 and the inner cylinder 72 are formed integrally with both the cylinders 71, 72. Of these connecting plates 73a, 73b, 73c, the connecting plate 73b provided at the center in the width direction, which is the direction of arrow W in the figure, penetrates the inner cylinder 72 in the direction perpendicular to the width direction, and the inner cylinder 72 The inner chamber 7d formed inside is divided into two.
Further, as shown in FIG. 2, lid plates 72 a and 72 b are joined to the upper and lower ends of the inner cylinder 72 by welding or the like so that the upper and lower ends of the inner cylinder 72 are closed, and the upper and lower ends of the outer cylinder 71 are closed. An upper cap member 74 and a lower cap member 75 having a substantially U-shaped cross section having an inner diameter dimension slightly larger than the outer dimension of the outer cylinder 71 are fitted into the section, and are joined by welding.
Therefore, an upstream chamber 7a and a downstream chamber 7b that are partitioned from the inside of the outer cylinder 71 and the inner cylinder 72 are formed at both upper and lower ends of the cold storage tank 7, and the upstream chamber 7a and the downstream chamber 7b are formed by the outer cylinder 71. And the inner cylinder 72 are communicated by a communication passage 7c extending in the axial direction.

The inner chamber 7d of the inner cylinder 72 is filled with a cold storage material 8a. The cold storage material 8a can exchange heat with the refrigerant to store the cooling energy of the refrigerant. For example, paraffin, water-absorbing polymer, plant cellulose, water, LLC, or the like can be used.
Further, a sheet-like cool storage material 8 b is also wound around the outer periphery of the outer cylinder 71.

In the refrigeration cycle 30, the inflow pipe 36 through which the refrigerant is sent from the evaporator 3 is connected to the upstream chamber 7 a of the cold storage tank 7 through the upper cap member 74.
On the other hand, an outflow pipe 37 that sends refrigerant from the cold storage tank 7 to the compressor 31 is connected to the downstream chamber 7 b of the cold storage tank 7 through the lower cap member 75.

  It should be noted that the control unit 2 is configured to form a room temperature set by a setting switch (not shown) based on an input from a sensor group SE including various sensors for detecting an indoor temperature environment factor. Control the temperature.

Next, the operation of the vehicle air conditioner A according to the first embodiment will be described.
When the cooling operation of the vehicle air conditioner A according to the first embodiment is performed while the vehicle is running, the compressor 31 is driven by an engine or motor (not shown), and the refrigeration cycle 30 is activated.
In this case, the refrigerant compressed and discharged by the compressor 31 is condensed and liquefied by the condenser 32, gas-liquid separated by the liquid tank 33, decompressed by the expansion valve 34, absorbed by the evaporator 3, and evaporated. At this time, the air in the air passage 18 of the air conditioning unit 1 is cooled.

  Then, the refrigerant evaporated in the evaporator 3 flows into the cold storage tank 7 through the inflow pipe 36, and moves from the upstream chamber 7a of the cold storage tank 7 to the downstream chamber 7b through the communication path 7c. The regenerator materials 8a and 8b arranged inside and outside are cooled, and cooling energy is stored in these regenerator materials 8a and 8b. In addition, the refrigerant in the downstream chamber 7 b moves from the outflow pipe 37 to the suction side of the compressor 31.

Next, the operation at the time of idle stop control will be described.
That is, the control unit 2 performs so-called idle stop control that automatically stops driving of the engine (not shown) when the vehicle stops.
During the idle stop control, the driving of the compressor 31 in the refrigeration cycle 30 is stopped.

At this time, in the refrigeration cycle 30, due to the residual pressure, the condenser 32 and liquid tank 33 that are high on the discharge side of the compressor 31, the evaporator 3 and the cold storage tank 7 on the low pressure side after being decompressed by the expansion valve 34, There is a differential pressure.
Therefore, due to this differential pressure, the refrigerant flows into the evaporator 3 from the liquid tank 33 side via the decompressor 35.
Therefore, in the evaporator 3, even after the compressor 31 is stopped, the refrigerant sent from the liquid tank 33 due to the residual pressure performs heat exchange with the blower passage 18 to perform cooling.

  The refrigerant gasified by heat exchange in the evaporator 3 flows into the upstream chamber 7a of the cold storage tank 7 from the inflow pipe 36 and is cooled by the cold storage materials 8a and 8b while moving through the communication passage 7c by gravity. The liquid is condensed and stored in the downstream chamber 7b.

In this way, since the refrigerant is condensed in the cold storage tank 7 to reduce the volume, the evaporator 3 and the cold storage tank 7 are kept at a low pressure, and the refrigerant is continuously sent to the evaporator 3 even after the compressor 31 is stopped. And cooling continues.
In addition, this continuous cooling is performed while the cool storage materials 8a and 8b are the temperature which can perform refrigerant | coolant condensation.

In the vehicle air conditioner A according to the first embodiment described above, since the cold storage tank 7 is installed inside the casing 1c of the air conditioning unit 1, the air conditioning unit 1 is assembled to the vehicle body when the vehicle air conditioner A is mounted on the vehicle. Thus, the cold storage tank 7 is also mounted on the vehicle, and the cold storage tank 7 is assembled in an independent manner as compared with the case where the cold storage tank 7 is installed outside the casing 1c of the air conditioning unit 1 in the vehicle compartment or the engine room. No work or connection work between the cold storage tank 7 and the piping is required, and the in-vehicle property is excellent.
Further, when setting the specification having the function of continuing the cooling state when the compressor 31 is stopped and the specification not having the function, the difference in the configuration due to the difference in the specification is the internal configuration of the air conditioning unit 1 and the shape on the vehicle body side. Etc., and it is easy to share the assembling work, so that it is excellent in in-vehicle performance and cost reduction.

  Furthermore, since the cold storage tank 7 is formed in a flat cylindrical shape, it can be arranged in the air conditioning unit 1 with a limited capacity so as not to be a resistance to blowing air in the air passage 18, as compared with a case where it is not flat. Excellent in-vehicle performance.

  In addition, in the first embodiment, the cold storage tank 7 has a structure in which the inside and outside of the communication passage 7c through which the refrigerant flows is surrounded by the cold storage materials 8a and 8b, and therefore, the cold storage materials 8a and 8b are only one of them. In comparison, the refrigerant cooling performance in the cold storage tank 7 is high, and the cooling continuation performance when the compressor 31 is stopped can be enhanced.

  In addition, since the cold storage tank 7 is formed by closing both ends of the double-cylinder structure portion of the extrusion molding material with the upper cap member 74 and the lower cap member 75, manufacturing is easy and cost reduction is achieved. Can do.

  In the cold storage tank 7, the refrigerant from the evaporator 3 flows into the upstream chamber 7 a at the upper end and flows out from the downstream chamber 7 b at the lower end to the compressor 31, so that the mist refrigerant flowing from the evaporator 3 directly It is difficult to send to the compressor 31, and the operation of the refrigeration cycle 30 can be stabilized.

(Other examples)
Hereinafter, other examples of the embodiment of the present invention will be described.
In the description of these other embodiments, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted. Also, with regard to the action, description of the action common to the first embodiment is omitted.

Based on FIG. 5, the vehicle air conditioner of Example 2 of the embodiment of the present invention will be described.
FIG. 5 is a configuration explanatory view showing the refrigeration cycle 230 of the vehicle air conditioner of the second embodiment. The difference from the first embodiment is that a decompressor 235 is provided in parallel with the expansion valve 34, and the liquid tank 33 In this example, a switching valve 200 is provided between the expansion valve 34 and the expansion valve 34 to switch between an expansion valve side open state in which the refrigerant from the liquid tank 33 flows only to the expansion valve 34 and a decompressor side open state in which only the decompressor 235 flows. is there.

  Note that the switching of the switching valve 200 is performed by the control unit 2. That is, the control unit 2 controls the switching valve 200 so that the expansion valve side is opened when the compressor 31 is driven and the decompressor side is opened when the compressor 31 is stopped.

In the vehicle air conditioner of the second embodiment, the existing expansion valve 34 can be used as the expansion valve 34 without using a function having a pressure reducer even in the closed state.
It should be noted that by installing the cold storage tank 7 in the casing 1c of the air conditioning unit 1, it is possible to improve the in-vehicle performance and to reduce the cost by improving the in-vehicle performance by sharing the shape of the vehicle body due to the difference in specifications. The point that the cool storage tank 7 is formed in a flat cylindrical shape improves the onboard performance, and the cool storage tank 7 can improve the cooling continuation performance by surrounding the inside and outside of the communication path 7c with the cool storage materials 8a and 8b. The point that the cold storage tank 7 is formed by closing both ends of the double cylindrical structure portion of the extrusion molding material with the upper cap member 74 and the lower cap member 75 can reduce the cost, and the cold storage tank 7 The refrigerant from the evaporator 3 is allowed to flow into the upstream chamber 7a at the upper end, and flows out from the downstream chamber 7b at the lower end to the compressor 31. That it is possible to operate stabilized, the same as in Example 1 for.

Based on FIG. 6 and FIG. 7, the vehicle air conditioner of Example 3 of the embodiment of the present invention will be described.
6 is a longitudinal sectional view showing a cold storage tank 307 used in the vehicle air conditioner of the third embodiment, and FIG. 7 is a transverse sectional view of the cold storage tank 307.

  As shown in FIGS. 6 and 7, the regenerator tank 307 includes a cylindrical outer cylinder 371 and an inner cylinder 372, and the upper and lower ends of the outer cylinder 371 are closed with lid plates 374 and 375, and the upper and lower sides of the inner cylinder 372 are closed. Is covered with lid plates 376 and 375, and a refrigerant space 373 is formed between the outer cylinder 371 and the inner cylinder 372.

  Similarly to the first embodiment, the regenerator material 8 a is filled inside the inner cylinder 372, and the sheet-shaped regenerator material 8 b is wound around the outer periphery of the outer cylinder 371.

  The inflow pipe 336 is inserted into the refrigerant space 373 from the upper end of the cold storage tank 307 and extends to the bottom of the refrigerant space 373. On the other hand, the outflow pipe 337 is inserted into the refrigerant space 373 from the upper end of the cold storage tank 307, and the tip is disposed at a position higher than the inflow pipe 336.

  As described above, in the third embodiment, since the existing inexpensive cylindrical pipe is used as the outer cylinder 371 and the inner cylinder 372 of the cold storage tank 307, it can be manufactured at low cost.

In the third embodiment, the pipes 336 and 337 are inserted from the upper end of the regenerator tank 307. However, since the inflow pipe 336 connected to the evaporator 3 is disposed at a position lower than the outflow pipe 337, the evaporator It is difficult for the mist-like refrigerant sent from 3 to be directly sucked into the outflow pipe 337 and sent to the compressor 31, and the cooling performance can be stabilized.
It should be noted that by installing the cold storage tank 7 in the casing 1c of the air conditioning unit 1, it is possible to improve the in-vehicle performance and to reduce the cost by improving the in-vehicle performance by sharing the shape of the vehicle body due to the difference in specifications. About a point, it is the same as that of Example 1. FIG.

Based on FIG. 8, the vehicle air conditioner of Example 4 of the embodiment of the present invention will be described.
FIG. 8 is a cross-sectional view showing a cold storage tank 407 used in the vehicle air conditioner of the fourth embodiment.
The fourth embodiment is a modification of the third embodiment, in which the tip of the outflow pipe 437 is disposed in the upper part of the refrigerant space 373, and further from the inflow pipe 336 directly below the front end of the outflow pipe 437. This is an example in which a shielding plate 401 is provided that prevents the mist-like refrigerant supplied to the space 373 from directly flowing into the outflow pipe 337.

As described above, in the fourth embodiment, the pipes 336 and 437 are inserted from the upper end of the regenerator tank 407, but the tip of the outflow pipe 437 is disposed at a position higher than the tip of the inflow pipe 336, and A shielding plate 401 is provided immediately below the outflow pipe 437. For this reason, it becomes difficult for the mist-like refrigerant supplied from the inflow pipe 336 to the refrigerant space 373 to be directly sucked into the outflow pipe 437, and the operation of the refrigeration cycle 30 can be stabilized.
It should be noted that by installing the cold storage tank 7 in the casing 1c of the air conditioning unit 1, it is possible to improve the in-vehicle performance and to reduce the cost by improving the in-vehicle performance by sharing the shape of the vehicle body due to the difference in specifications. About a point, it is the same as that of Example 1. FIG.

  As described above, the embodiment of the present invention and Examples 1 to 4 have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment and Examples 1 to 4. Design changes that do not depart from the gist of the present invention are included in the present invention.

  For example, in the first to fourth embodiments, the cold storage tank has a flat elliptical shape and a circular shape, but is not limited to this, and has other shapes such as a rectangular shape, a rectangular shape, or a polygonal shape. May be used.

  Moreover, in Example 1- Example 4, although the cold storage tank was made into the double structure inside and outside, the example which provided the cold storage material 8a inside was shown, when providing a cold storage material only outside, a cold storage tank is provided. It is not necessary to have a double structure. Or you may make it provide a cool storage material only inside the cool storage tank of a double structure.

It is composition explanatory drawing which shows the refrigerating cycle 30 used for the vehicle air conditioner A of Example 1 of the best embodiment of this invention. It is a longitudinal cross-sectional view which shows the cool storage tank 7 used for the vehicle air conditioner A of Example 1, Comprising: The state cut | disconnected by the S2-S2 line | wire of FIG. 3 is shown. It is a longitudinal cross-sectional view which shows the cool storage tank 7 used for the vehicle air conditioner A of Example 1, Comprising: The state cut | disconnected by the S3-S3 line of FIG. 2 is shown. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram illustrating a configuration of a vehicle air conditioner A according to Example 1 of the best mode of the present invention. FIG. 6 is a configuration explanatory diagram showing a refrigeration cycle 230 in the vehicle air conditioner of Embodiment 2. It is a longitudinal cross-sectional view which shows the cool storage tank 307 used for the vehicle air conditioner of Example 3, Comprising: The state cut | disconnected by the S6-S6 line of FIG. 7 is shown. It is a cross-sectional view which shows the cool storage tank 307 used for the vehicle air conditioner of Example 3, Comprising: The state cut | disconnected by the S7-S7 line | wire of FIG. 6 is shown. It is a longitudinal cross-sectional view which shows the cool storage tank 407 used for the vehicle air conditioner of Example 4. FIG.

Explanation of symbols

A Vehicle air conditioner 1 Air conditioning unit 1c Casing 3 Evaporator 4 Blower fan (blower)
7 Cool storage tank 8 a Cool storage material 8 b Cool storage material 18 Blower passage 30 Refrigeration cycle 31 Compressor 32 Capacitor 33 Liquid tank 34 Expansion valve 35 Decompressor 36 Inflow pipe 37 Outflow pipe 230 Refrigeration cycle 235 Decompression machine 307 Cold storage tank 336 Inflow pipe 337 Outflow pipe 407 Cold storage tank 437 Outflow pipe

Claims (3)

An air-conditioning unit in which a blower that forms air flow passing through the air flow passage and an evaporator that cools the air flow are mounted on a casing that forms air flow toward the air outlet that communicates from the suction port to the air outlet;
A refrigerating cycle including the evaporator, wherein the refrigerant circulates in the order of a compressor, a condenser, an expansion valve, and the evaporator;
In this refrigeration cycle, when the compressor stops driving, the condenser-side high-pressure refrigerant is decompressed to the evaporator side so that it can be supplied, and a decompressor provided in parallel with the expansion valve;
A cold storage tank connected between the evaporator and the compressor in the refrigeration cycle, installed in the casing and configured to store the refrigerant, and having a cold storage material for cooling the refrigerant inside; ,
A vehicle air conditioner characterized by comprising:   The vehicle air conditioner according to claim 1, wherein the cold storage tank is formed in a flat cylindrical shape crushed in a direction orthogonal to the axis.   An inflow pipe into which refrigerant is introduced from the evaporator, and an outflow pipe for sending the introduced refrigerant to the condenser are inserted into the cold storage tank with their tips directed downward in the direction of gravity, and the inflow pipe The vehicular air conditioner according to claim 1 or 2, wherein a tip position of the pipe is disposed at a position lower than a tip position of the outflow pipe.

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