JP2013018299A - Cooling unit of air conditioner for vehicle - Google Patents

Abstract

A cooling unit for a vehicle air conditioner capable of effectively suppressing a reduction in cooling capacity when a compressor is stopped.
A cooling unit (6) includes an evaporator (4) and a regenerator (5) that is disposed below the evaporator (4) and stores cold heat using condensed water generated by the evaporator (4). The evaporator 4 includes fins 27 arranged in a ventilation gap 25 formed between the refrigerant circulation pipes 23 and the adjacent refrigerant circulation pipes 23, and the fins 27 are at least a part of the ventilation gaps 25. The heat exchange core portion 13 is disposed at 25. The regenerator 5 includes a box-shaped body 31 that opens upward, and a condensed water container 32 that is disposed in the box-shaped body 31 and receives condensed water that has dropped from the evaporator 4. Vents 39 are provided in the upstream portion and the downstream portion of the box-shaped body 31 in the ventilation direction.
[Selection] Figure 2

Description

  The present invention relates to a cooling unit used in a vehicle air conditioner that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped.

  In this specification and claims, the top and bottom of FIGS. 2 and 3 are referred to as top and bottom.

  In addition, in this specification and claims, the term “capacitor” means a subcool condenser having a condensing part and a supercooling part in addition to a normal condenser.

  In recent years, automobiles have been proposed that automatically stop the engine when the vehicle stops, such as when waiting for a signal, for the purpose of environmental protection or improvement in automobile fuel efficiency.

  However, in an ordinary vehicle air conditioner, when the engine is stopped, the compressor using the engine as a drive source stops, so that there is a problem that the refrigerant is not supplied to the evaporator and the cooling capacity is rapidly reduced.

  Therefore, in order to solve such problems, the evaporator is provided with a cold storage function, and when the engine stops and the compressor stops, the cold stored in the evaporator is discharged to cool the vehicle interior. Is considered.

  This type of evaporator with a cold storage function includes a pair of tanks arranged at intervals in the vertical direction and a heat exchange core portion provided between the two tanks. A plurality of flat refrigerant flows that are arranged in the length direction of both tanks with the length direction facing the up-and-down direction and with both the upper and lower ends communicating with both tanks. A pipe, and a regenerator container that is disposed at intervals in the length direction of both tanks with the width direction directed in the ventilation direction and the length direction directed in the vertical direction, and in which the regenerator material is enclosed. There has been proposed an evaporator with a cold storage function in which the cold storage material in the cold storage material container is cooled by the cold heat of the refrigerant flowing in the refrigerant flow pipe (see Patent Document 1).

  According to the vehicle air conditioner provided with the evaporator with the cold storage function described in Patent Document 1, during normal cooling when the compressor is operating, the cold heat of the refrigerant flowing in the refrigerant distribution pipe is converted into the cold storage material in the cold storage material container. When the compressor is stopped after being transferred to the cool storage material, the heat stored in the cool storage material in the cool storage material container is exchanged through the refrigerant distribution pipe in which the cool storage material container is in thermal contact. It is allowed to cool by air passing through the core part.

  By the way, recently, in a vehicle air conditioner equipped with an evaporator with a cold storage function described in Patent Document 1, it has been required to more effectively reduce a decrease in cooling capacity when the compressor is stopped. .

Japanese Patent No. 4043776

  The objective of this invention is providing the cooling unit of the air conditioner for vehicles which can suppress effectively the fall of the cooling capability at the time of a compressor stop according to the said request | requirement.

  In order to achieve the above object, the present invention comprises the following aspects.

  1) A plurality of refrigerant flow pipes whose length direction is directed in the vertical direction and spaced from each other, and fins arranged in a ventilation gap formed between adjacent refrigerant flow pipes, An evaporator having a heat exchange core portion disposed in at least a part of the entire ventilation gap, and a regenerator that is disposed below the evaporator and stores cold heat using condensed water generated in the evaporator. A cooling unit for a vehicle air conditioner.

  2) The regenerator includes a box-shaped body that opens upward, and a condensate container that is disposed in the box-shaped body and receives condensed water that has fallen from the evaporator. The cooling unit for a vehicle air conditioner according to 1) above, wherein a vent is provided in a downstream portion.

  3) The regenerator has a plurality of condensate containers arranged side by side in the vertical direction, a plurality of drain holes are formed in the bottom wall of each condensate container, and the drain holes of the condensate containers adjacent to each other vertically The cooling unit for a vehicle air conditioner according to 2) above, wherein is deviated when viewed from above.

  4) On the bottom wall of the condensate container, a plurality of condensate reservoirs having a substantially V-shaped cross section extending in a direction perpendicular to the ventilation direction are formed side by side in the ventilation direction. The cooling unit for a vehicle air conditioner according to 3) above, wherein the plurality of drain holes are formed at intervals in the length direction of the condensed water reservoir.

  5) A regenerator is a box-shaped body that opens upward, and a water-cooled regenerator that is placed inside the box-shaped body and encloses the regenerator material, and that the cool heat of the condensed water dropped from the evaporator is transmitted to the internal regenerator material A cooling unit for a vehicle air conditioner according to 1) above, wherein a ventilation hole is provided in an upstream portion and a downstream portion of the box-like body in the ventilation direction.

  6) The regenerator has a plurality of flat water-cooled regenerator containers arranged in the vertical direction with the longitudinal direction facing the direction perpendicular to the ventilation direction and the width direction facing the ventilation direction. Each water-cooled regenerator container is formed with a plurality of condensate passages for allowing condensed water to pass from above to below, and the condensate passages of the water-cooled regenerator containers adjacent to each other are shifted from above. 5. A cooling unit for a vehicle air conditioner as described in 5) above.

  7) The cooling unit for a vehicle air conditioner according to 6) above, wherein a ventilation gap is formed between water-cooled regenerator materials adjacent in the vertical direction, and fins are arranged in the ventilation gap.

  8) Refrigerants in which fins are arranged in some of the ventilation gaps in the entire ventilation gap of the heat exchange core portion of the evaporator, the regenerator material is sealed in the remaining ventilation gaps, and the internal regenerator material flows through the refrigerant distribution pipe The cooling unit for a vehicle air conditioner according to any one of the above 1) to 7), in which a cold storage material container to which cold heat of the vehicle is transmitted is disposed.

  9) a compressor, a condenser, a decompressor, the cooling unit according to any one of 1) to 8) above, and a unit case having an air passage in which the cooling unit is disposed, and A vehicle air conditioner that temporarily stops an engine that is a driving source of a compressor when the vehicle stops.

  10) The air passage of the unit case is designed to send air to the cooling unit and to send the air that has passed through the cooling unit to the passenger compartment of the vehicle, and the cooling in the air passage upstream of the cooling unit in the air passage. A trunk that sends air to the heat exchanger core of the evaporator of the unit and a branch that branches from the trunk and sends air to the regenerator of the cooling unit are provided, and the trunk when the compressor is operating in the unit case The vehicle air conditioner according to 9) above, wherein a switching device is provided to allow air to flow through at least a branch portion of the trunk portion and the branch portion when the compressor is stopped.

  According to the cooling units of 1) to 8) above, a plurality of refrigerant flow pipes whose length direction is directed in the vertical direction and spaced from each other, and ventilation formed between adjacent refrigerant flow pipes An evaporator having fins arranged in the gap and having a heat exchange core portion in which the fin is arranged in at least a part of the whole ventilation gap, and condensation generated at the evaporator below the evaporator Condensation generated on the surface of the evaporator refrigerant flow pipe and the fin surface by flowing air through the heat exchange core of the evaporator when the compressor is operating. Cold energy is stored in the regenerator using water. Therefore, when the compressor is stopped, air is allowed to flow through the regenerator, so that the cold energy stored in the regenerator during operation of the compressor can be used for cooling the vehicle interior of the vehicle. It is possible to further effectively suppress the decrease in cooling capacity.

  According to the cooling units of the above 2) to 4), when the compressor is operated, the low-temperature condensed water generated on the surface of the evaporator refrigerant flow pipe and the fin surface falls from the evaporator, and the condensed water container of the regenerator When the compressor is stopped, the cold heat of the condensed water stored in the condensed water container is used for cooling the vehicle interior of the vehicle.

  According to the cooling unit of 3), it takes a relatively long time for the condensed water falling from the evaporator to be drained from the condensed water container at the lower end, and a relatively large amount of cold energy can be stored in the regenerator.

  According to the cooling unit of 4) above, the air that has entered the box-like body through the vent on the windward side passes through the drain hole of the condensate container, and the air is supplied to the regenerator when the compressor is stopped. When flowing, the air that has entered the box-shaped body flows between adjacent condensate containers, and the cold heat of the condensate in the condensate container is efficiently transmitted to the air.

  According to the above cooling units 5) to 7), during the operation of the compressor, the cold storage in the water-cooled regenerator material container of the regenerator is performed using the condensed water generated on the surface of the refrigerant circulation pipe of the evaporator and the surface of the fin. Cold energy is stored in the material, and when the compressor is stopped, the cold energy of the cold storage material in the water-cooled cold storage material container is used for cooling the vehicle interior of the vehicle.

  According to the cooling unit of 6) above, the time until the condensed water dropped from the evaporator falls below the water-cooled regenerator container at the lower end is relatively long, compared with the regenerator material in the water-cooled regenerator container. It can store a lot of cold energy.

  According to the cooling unit of the above 7), when the compressor is stopped, the cold heat of the regenerator material in the water-cooled regenerator material container enters the box-like body through the vent on the windward side through the fins and is adjacent to it. It is transmitted to the air flowing through the ventilation gap between the water-cooled regenerator containers. Therefore, the cold heat of the cool storage material in the water-cooled cool storage material container is efficiently transmitted to the air.

  According to the cooling unit of the above 8), during operation of the compressor, the regenerator material in the regenerator container of the heat exchange core part of the evaporator is cooled by the refrigerant flowing in the refrigerant distribution pipe, so when the compressor is stopped, The cold heat of the cool storage material in the cool storage material container is also used for cooling the passenger compartment of the vehicle. Therefore, it is possible to more effectively reduce the decrease in cooling capacity when the compressor is stopped.

  According to the vehicle air conditioner of 9), the same effects as described in the cooling units of 1) to 8) can be obtained.

  According to the vehicle air conditioner of the above 10), it is relatively easy to flow air through the heat exchange core portion of the evaporator when the compressor is operating and to flow air through the regenerator when the compressor is stopped.

It is a figure which shows the structure of the vehicle air conditioner using the cooling unit of this invention. FIG. 2 is a partially cutaway perspective view showing an overall configuration of a cooling unit of the vehicle air conditioner of FIG. 1. It is an AA line expanded sectional view of FIG. It is a figure equivalent to FIG. 3 which shows other embodiment of a cooling unit.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the downstream side in the ventilation direction (the direction indicated by the arrow X in FIGS. 2 to 4) is the front, and the opposite side is the rear. Further, the left and right when viewing the rear from the front, that is, the left and right in FIG.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  Furthermore, the same parts and the same parts are denoted by the same reference numerals throughout the drawings, and redundant description is omitted.

  FIG. 1 shows a vehicle air conditioner used in a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped, and FIG. 2 shows an overall configuration of a cooling unit used in the vehicle air conditioner shown in FIG. FIG. 3 shows a main part of the cooling unit of FIG.

  In FIG. 1, a vehicle air conditioner used for a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped is compressed by a compressor (1) using the engine as a drive source and a compressor (1). Condenser (2) (refrigerant cooler) for cooling the cooled refrigerant, expansion valve (3) as a pressure reducer for depressurizing the refrigerant cooled by the condenser (2), and evaporator (4) for evaporating the decompressed refrigerant ), And a cooling unit (6) that is disposed below the evaporator (4) and has a regenerator (5) that stores cold heat using the condensed water generated in the evaporator (4), and a cooling unit (6) And a unit case (7) arranged. Although not shown, the vehicle air conditioner has a liquid receiving unit that stores a gas-liquid mixed phase refrigerant and separates it into a liquid phase and a gas phase.

  The evaporator (4) of the cooling unit (6) includes an aluminum first header tank (11) and an aluminum second header tank (12) extending in the horizontal direction and spaced apart in the vertical direction, and both header tanks. (11) A heat exchange core portion (13) provided between (12) is provided.

  As shown in FIG. 2 and FIG. 3, the first header tank (11) is located on the front side (downstream side in the ventilation direction) of the refrigerant inlet header (14) and on the rear side (upstream side in the ventilation direction) And a refrigerant outlet header portion (15) integrated with the refrigerant inlet header portion (14). A refrigerant inlet (16) is provided at the right end of the refrigerant inlet header (14), and a refrigerant outlet (17) is provided at the right end of the refrigerant outlet header (15). The second header tank (12) includes a first intermediate header portion (18) located on the front side and a second intermediate header portion (19) located on the rear side and integrated with the first intermediate header portion (18). And. The first intermediate header portion (18) and the second intermediate header portion (19) of the second header tank (12) are joined across the right end portions of the intermediate header portions (18) and (19), and The inside is communicated through a communication member (21) that forms a passage. Further, a plurality of drainage through holes (22) are spaced in the left-right direction between the first intermediate header portion (18) and the second intermediate header portion (19) of the second header tank (12). Is formed.

  The heat exchange core (13) has a plurality of extruded aluminum flat refrigerant flow pipes (23) with the width direction facing the ventilation direction (front-rear direction) and the length direction facing the up-down direction. Are arranged in parallel at intervals. That is, a plurality (24) of a plurality of refrigerant circulation pipes (23) arranged at intervals in the front-rear direction are arranged at intervals in the left-right direction. A ventilation gap (25) is formed between adjacent ones of the group (24) consisting of (23). The upper end portion of the front refrigerant flow pipe (23) is connected to the refrigerant inlet header portion (14), and the lower end portion thereof is connected to the first intermediate header portion (18). The upper end of the rear refrigerant flow pipe (23) is connected to the refrigerant outlet header (15), and the lower end is connected to the second intermediate header (19).

  Aluminum regenerator container in which a regenerator material is enclosed in a part of a plurality of ventilation gaps (25) and not adjacent to one another among all ventilation gaps (25) in the heat exchange core section (13). (26) is arranged so as to straddle both the front and rear refrigerant flow pipes (23), whereby the evaporator (4) has a cold storage function. Further, in the remaining ventilation gap (25), corrugated outer fins (27) made of an aluminum brazing sheet having a brazing filler metal layer on both sides are arranged so as to straddle the front and rear refrigerant flow pipes (23). It is brazed to both the front and rear refrigerant flow pipes (23) constituting the left and right set (24) forming (25). That is, the outer fins (27) are arranged in the ventilation gaps (25) on both sides of the ventilation gap (25) where the cool storage material container (26) is arranged. In addition, corrugated outer fins (27) made of an aluminum brazing sheet having brazing material layers on both sides are also arranged outside the set (24) of the refrigerant flow tubes (23) at both left and right ends, and both the front and rear refrigerant flow tubes (23 Further, an aluminum side plate (28) is disposed outside the outer fins (27) at the left and right ends, and is brazed to the outer fins (27). An outer projecting portion (27a) projecting forward from the front edge of the front refrigerant flow pipe (23) is provided at the front edge portion of the outer fin (27). An aluminum spacer (29) is arranged between the outwardly projecting portions (27a) of the outer fins (27) arranged in the adjacent ventilation gap (25) where the cold storage material container (26) is not arranged. It is brazed to the overhang part (27a).

  The cold storage material container (26) has a flat shape in which the width direction faces the front-rear direction and the length direction faces the up-down direction, is located behind the front edge of the front refrigerant flow pipe (23), and each set ( 24) and the front and rear refrigerant flow pipes (23a and 26a) brazed to the two refrigerant flow pipes (23) and the front edge (leeward edge) of the container main body (26a). ) And an outward projecting portion (26b) provided so as to project forward (outside in the ventilation direction) from the front side edge. The horizontal dimension of the container body (26a) of the cold storage material container (26) is the same as the whole. The outwardly projecting portion (26b) of the cold storage material container (26) has the vertical dimension equal to the vertical dimension of the container main body (26a) and the horizontal dimension of the container main body (26a) horizontal direction. And is bulging outward in the left-right direction with respect to the container body (26a). The lateral dimension of the outward projecting part (26b) is twice the pipe height, which is the lateral dimension of the refrigerant flow pipe (23), and the left and right dimensions of the container body part (26a) of the regenerator container (26). It is equal to the height plus the dimension in the direction. Then, on the left and right sides of the outwardly projecting portion (26b) of the cold storage material container (26), the outer space disposed in the ventilation gap (25) adjacent to the ventilation gap (25) where the cold storage material container (26) is disposed. The outwardly projecting portion (27a) of the fin (27) is brazed.

  As the cold storage material filled in the cold storage material container (26), a paraffin-based latent heat cold storage material having a freezing point adjusted to about 5 to 10 ° C is used. Specifically, pentadecane, tetradecane, or the like is used. Moreover, the cold storage material filling rate which is the ratio of the volume of the enclosed cold storage material to the internal volume of the cold storage material container (26) is 70 to 80%. The filling rate is at room temperature.

  The regenerator (5) has a box-shaped body (31) that opens upward, and a plurality of condensed water that is arranged side by side in the box-shaped body (31) and that receives the condensed water generated by the evaporator (4). The container (32) is provided, and a portion of the evaporator (4) excluding the upper part of the second header tank (12) is fitted in the box-shaped body (31). The box-shaped body (31) has both front and rear walls (31a) and left and right walls (31b), and the rear wall (31a) (upstream portion in the ventilation direction) and the front wall (31a) (downstream in the ventilation direction). A plurality of vent holes (39) are formed at intervals in the left-right direction. Although not shown, a drain port is provided on the bottom wall of the box-shaped body (31).

  On the bottom wall of the condensate container (32) of the regenerator (5), a plurality of condensate reservoirs (33) having a substantially V-shaped cross section extending in a direction perpendicular to the ventilation direction are formed side by side in the ventilation direction. A plurality of drain holes (34) are formed at the bottom of the condensed water storage part (33) at intervals in the length direction of the condensed water storage part (33). The drainage holes (34) of the condensate water containers (32) adjacent to each other in the vertical direction are displaced from above.

  The unit case (7) of the vehicle air conditioner in which the cooling unit (6) is arranged sends air to the cooling unit (6) and sends air that has passed through the cooling unit (6) to the vehicle compartment. It has a passage (35). In the air passage (35) upstream of the cooling unit (6) in the ventilation direction, a trunk (36) for sending air to the heat exchange core (13) of the evaporator (4) of the cooling unit (6), and a trunk ( A branch portion (37) that branches from 36) and sends air to the regenerator (5) of the cooling unit (6) is provided. The unit case (7) allows air to flow through the trunk (36) when the compressor (1) is operating, and at least the branch of the trunk (36) and the branch (37) when the compressor is stopped. (37) Here, there is provided a switching device (38) for flowing air to both the trunk (36) and the branch (37).

  In the vehicle air conditioner described above, when the compressor (1) is operating, the switching device (38) allows air to flow only to the trunk (36) of the air passage (35) of the unit case (7). It is. The low-pressure gas-liquid mixed-phase two-phase refrigerant that has been compressed by the compressor (1) and passed through the condenser (2) and the expansion valve (3) passes through the refrigerant inlet (16) and forms a refrigerant inlet header portion of the evaporator (4). (14) Enters the first intermediate header section (18) through the front refrigerant flow pipe (23). The refrigerant that has entered the first intermediate header section (18) passes through the communication member (21), enters the second intermediate header section (19), and then exits through the rear refrigerant flow pipe (23). It flows into the header part (15) and flows out from the refrigerant outlet (17). Then, while the refrigerant flows through the refrigerant flow pipe (23), heat exchange is performed with the air passing through the ventilation gap (25), the refrigerant flows out as a gas phase, and the air is cooled. The cooled air is sent to the vehicle interior of the vehicle through the air passage (35). At this time, the cold storage material in the cold storage material container (26) is cooled by the cold heat of the refrigerant flowing in the refrigerant flow pipe (23), and cold heat is stored in the cold storage material.

  Further, during the operation of the compressor, the condensed water generated on the surfaces of the refrigerant flow pipe (23) and the outer fin (27) of the evaporator (4) flows down onto the second header tank (12), and the first intermediate header portion. It passes through the drainage through hole (22) between (18) and the second intermediate header (19) and falls into the condensed water container (32) at the upper end of the regenerator (5). The condensed water that has fallen into the upper condensed water container (32) is temporarily stored in the condensed water storage section (33), and then falls sequentially into the condensed water container (32) below through the drain hole (34). And it falls on the bottom wall of the box-shaped body (31) from the condensed water container (32) at the lower end, and is drained from the drain outlet of the box-shaped body (31).

  When the compressor (1) is stopped, the switching device (38) causes air to flow through both the trunk (36) and the branch (37) of the air passage (35) of the unit case (7). The air that has flowed into the trunk portion (36) of the air passage (35) passes through the ventilation gap (25) in which the outer fin (27) of the evaporator (4) is disposed and is sent into the vehicle interior of the vehicle. At this time, the cold heat of the cool storage material in the container main body (26a) and the outwardly projecting portion (26b) of the cool storage material container (26) is transmitted to the left and right side walls of the cool storage material container (26), and the refrigerant circulation pipe Ventilation gaps on both sides of the ventilation gap (25) where the cold storage material container (26) is disposed through the outer fin (27) brazed to the refrigerant flow pipe (23). It is transmitted to the air passing through 25) and the air is cooled.

  On the other hand, the air that has flowed into the branch portion (37) of the air passage (35) passes through the vent (39) on the upstream side in the ventilation direction of the box-shaped body (31) of the regenerator (5) ( 31) enters the vehicle interior of the vehicle through the ventilation port (39) on the downstream side in the ventilation direction through the outside in the vertical direction of the condensed water containers (32) at the upper and lower ends and between the adjacent condensed water containers (32). Sent. At this time, the condensed water has the condensed water until it passes from the upper condensed water container (32) to the lower condensed water container (32) and falls on the bottom wall of the box-shaped body (31). Cold heat is transmitted to the air passing through the box-like body (31), and the air is cooled.

  Therefore, since the cooled air is sent into the vehicle interior of the vehicle, even if the compressor stops and the refrigerant no longer flows through the refrigerant distribution pipe, a rapid decrease in the cooling capacity is prevented.

  In the above embodiment, the cool storage material container (25) is disposed in the ventilation gap (25) of a part of the heat exchange core part (13) of the evaporator (4), but is not limited thereto, An outer fin (27) may be disposed in the ventilation gap (25).

  FIG. 4 shows a modification of the regenerator.

  In the case of the regenerator (40) shown in FIG. 4, a regenerator material is enclosed in a box-shaped body (31), and a plurality of water-cooled regenerator containers (condensate water) are transmitted to the internal regenerator material ( 41) are arranged at intervals in the vertical direction. The water-cooled regenerator container (41) has a flat shape in which the longitudinal direction is directed in a direction perpendicular to the ventilation direction and the width direction is directed in the ventilation direction. In each water-cooled regenerator material container (41), a plurality of condensate passage parts (42) for allowing condensed water to pass from above to below are formed so that the regenerator material does not leak to the outside. The condensate passage part (42) of the material container (41) is displaced as seen from above or below. In addition, a ventilation gap (43) is formed between the water-cooled regenerator containers (41) adjacent in the vertical direction, and fins flow through the ventilation gap (43) in the ventilation direction (from right to left in FIG. 4). (44) is arranged.

  Water-cooled regenerator material (As the regenerator material filled in 41, a paraffin-based latent heat regenerator material whose freezing point is adjusted to about 5 to 10 ° C. is used. Specifically, pentadecane, tetradecane, or the like is used.

  In the vehicle air conditioner provided with the cooling unit (6) using the regenerator (40) shown in FIG. 4, when the compressor (1) is operating, the switching device (38) causes the unit case ( Air flows only to the trunk (36) of the air passage (35) of 7). The low-pressure gas-liquid mixed-phase two-phase refrigerant that has been compressed by the compressor (1) and passed through the condenser (2) and the expansion valve (3) passes through the refrigerant inlet (16) and forms a refrigerant inlet header portion of the evaporator (4). (14) Enters the first intermediate header section (18) through the front refrigerant flow pipe (23). The refrigerant that has entered the first intermediate header section (18) passes through the communication member (21), enters the second intermediate header section (19), and then exits through the rear refrigerant flow pipe (23). It flows into the header part (15) and flows out from the refrigerant outlet (17). Then, while the refrigerant flows through the refrigerant flow pipe (23), heat exchange is performed with the air passing through the ventilation gap (25), the refrigerant flows out as a gas phase, and the air is cooled. The cooled air is sent to the vehicle interior of the vehicle through the air passage (35). At this time, the cold storage material in the cold storage material container (26) is cooled by the cold heat of the refrigerant flowing in the refrigerant flow pipe (23), and cold heat is stored in the cold storage material.

  Further, during the operation of the compressor, the condensed water generated on the surfaces of the refrigerant flow pipe (23) and the outer fin (27) flows down onto the second header tank (12), and the first intermediate header (18) and the first 2 It passes through the drainage hole between the intermediate header part (19) and falls onto the water-cooled regenerator container (41) at the upper end of the regenerator (40). Condensed water that has dropped onto the water-cooled regenerator container (41) at the upper end passes through the drain hole (42), and then falls onto the water-cooled regenerator container (41) at the bottom, and the water-cooled regenerator container (at the lower end) ( 41) falls onto the bottom wall of the box-shaped body (31) and is drained from the drain outlet of the box-shaped body (31).

  When the compressor (1) is stopped, the switching device (38) causes air to flow through both the trunk (36) and the branch (37) of the air passage (35) of the unit case (7). The air that has flowed into the trunk portion (36) of the air passage (35) passes through the ventilation gap (25) in which the outer fin (27) of the evaporator (4) is disposed and is sent into the vehicle interior of the vehicle. At this time, the cold heat of the cool storage material in the container main body (26a) and the outwardly projecting portion (26b) of the cool storage material container (26) is transmitted to the left and right side walls of the cool storage material container (26), and the refrigerant circulation pipe Ventilation gaps on both sides of the ventilation gap (25) where the cold storage material container (26) is disposed through the outer fin (27) brazed to the refrigerant flow pipe (23). It is transmitted to the air passing through 25) and the air is cooled.

  On the other hand, the air that has flowed into the branch portion (37) of the air passage (35) passes through the vent on the upstream side in the ventilation direction of the box-shaped body (31) of the regenerator (40), and enters the box-shaped body (31). The vehicle passes through the ventilation gap (43) between the upper and lower water-cooled regenerator containers (41) at the upper and lower ends and between the adjacent water-cooled regenerator containers (41), and through the vent on the downstream side of the ventilating direction. Sent to the passenger compartment. At this time, the cold heat of the regenerator in the water-cooled regenerator container (41) is transmitted to the upper and lower walls of the water-cooled regenerator container (41), and the water-cooled regenerator container (41 ) And the air flowing through the ventilation gap (43) via the fin (44), and the air is cooled.

  Therefore, since the cooled air is sent into the vehicle interior of the vehicle, even if the compressor stops and the refrigerant no longer flows through the refrigerant distribution pipe, a rapid decrease in the cooling capacity is prevented.

  The cooling unit according to the present invention is suitably used in a refrigeration cycle that constitutes a vehicle air conditioner for a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped.

(1): Compressor
(2): Capacitor
(3): Expansion valve (pressure reducer)
(4): Evaporator
(5): Regenerator
(6): Cooling unit
(7): Unit case
(13): Heat exchange core
(23): Refrigerant distribution pipe
(26): Cold storage container
(27): Outer fin
(31): Box-shaped body
(32): Condensate container
(33): Condensate reservoir
(34): Drainage hole
(35): Air passage
(36): Executive
(37): Branch
(38): Switching device
(39): Vent
(40): Regenerator
(41): Water-cooled regenerator container
(42): Condensate passage
(43): Ventilation gap
(44): Fin

Claims (10)

A plurality of refrigerant flow pipes arranged in the vertical direction and spaced apart from each other, and fins arranged in a ventilation gap formed between adjacent refrigerant flow pipes. An evaporator having a heat exchange core portion arranged in at least a part of the ventilation gap, and a regenerator arranged below the evaporator and storing cold heat using condensed water generated in the evaporator. Cooling unit for vehicle air conditioner. The regenerator includes a box-like body that opens upward, and a condensed water container that is disposed in the box-like body and receives condensed water that has dropped from the evaporator, and the upstream side portion and the downstream side of the box-like body in the ventilation direction The cooling unit of the vehicle air conditioner according to claim 1, wherein the portion is provided with a vent hole. The regenerator has a plurality of condensate containers arranged side by side in the vertical direction, a plurality of drain holes are formed in the bottom wall of each condensate container, and the drain holes of adjacent condensate containers are vertically upward The cooling unit of the vehicle air conditioner of Claim 2 which has shifted | deviated from seeing. On the bottom wall of the condensed water container, a plurality of condensed water reservoirs having a substantially V-shaped cross section extending in a direction perpendicular to the ventilation direction are formed side by side in the ventilation direction. The cooling unit of a vehicle air conditioner according to claim 3, wherein the drainage holes are formed at intervals in the length direction of the condensed water storage portion. A regenerator has a box-shaped body that opens upward, a water-cooled regenerator container that is disposed in the box-shaped body and encloses the regenerator material, and that the cool heat of the condensed water that has fallen from the evaporator is transmitted to the internal regenerator material The cooling unit for a vehicle air conditioner according to claim 1, wherein a vent is provided in an upstream portion and a downstream portion of the box-like body in the ventilation direction. The regenerator has a plurality of flat water-cooled regenerator containers arranged in the vertical direction in a state where the longitudinal direction is in a direction perpendicular to the ventilation direction and the width direction is in the ventilation direction, A plurality of condensed water passage portions for allowing condensed water to pass from above to below are formed in the water-cooled regenerator material container, and the condensed water passage portions of the water-cooled regenerator materials adjacent to each other in the vertical direction are deviated from above. 6. A cooling unit for a vehicle air conditioner according to 5. The cooling unit for a vehicle air conditioner according to claim 6, wherein a ventilation gap is formed between water-cooled regenerator containers adjacent in the vertical direction, and fins are arranged in the ventilation gap. Fins are arranged in some of the ventilation gaps of all the ventilation gaps of the heat exchange core portion of the evaporator, and the remaining ventilation gaps are filled with the regenerator material and the internal regenerator material has the refrigerant flowing in the refrigerant distribution pipe. The cooling unit of the vehicle air conditioner in any one of Claims 1-7 by which the cool storage material container to which cold heat is transmitted is arrange | positioned. A compressor, a condenser, a decompressor, the cooling unit according to any one of claims 1 to 8, and a unit case having an air passage in which the cooling unit is arranged, and compressed when the vehicle is stopped A vehicle air conditioner that temporarily stops the engine that is the drive source of the machine. The air passage of the unit case is configured to send air to the cooling unit and to send the air that has passed through the cooling unit to the passenger compartment of the vehicle, and the cooling unit in the air passage is upstream of the cooling unit in the ventilation direction. A trunk that sends air to the heat exchange core of the evaporator and a branch that branches from the trunk and sends air to the regenerator of the cooling unit are provided, and the unit case has air to the trunk when the compressor is operating. The vehicle air conditioner according to claim 9, wherein a switching device is provided to flow air to at least a branch portion of the trunk portion and the branch portion when the compressor is stopped.

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