JP2014089035A - Cold storage heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold storage heat exchanger capable of suppressing degradation of cooling-down performance in starting an engine and increase in cost.SOLUTION: A cold storage heat exchanger includes an evaporator 1 and a cold storage unit 2. The cold storage unit 2 has a plurality of tubes 5 extended in a direction orthogonal to a flowing direction of airflow. The tubes 5 are respectively partitioned inside thereof to form a plurality of flow channels 5a, 5b, 5c respectively extended in the orthogonal direction, and the flow channels 5a, 5b, 5c are arranged in series along the flowing direction of airflow, and a cold storage agent-filled flow channel filled with a cold storage agent, and a refrigerant circulation passage in which a refrigerant of the evaporator flows, are disposed.

Description

  The present invention relates to a cold storage heat exchanger that includes a cold storage agent that can be cooled by a refrigerant and that can be cooled by using the cold energy of the cold storage agent during idle stop.

Some vehicles have a so-called idle stop function that improves fuel efficiency by stopping the engine once when the vehicle is temporarily stopped.
In such a vehicle, when the air conditioner is operated, the engine is temporarily stopped at the idle stop, so that the driving of the compressor of the air conditioning system driven by the engine is also stopped. . Then, the refrigerant used in the system is no longer cooled.
Therefore, in order to allow cold air to be supplied into the passenger compartment even when the engine is temporarily stopped, a cold storage agent is provided so that heat can be exchanged between the cold storage agent and the refrigerant, and cold energy is stored in the cold storage agent. A cold storage heat exchanger that uses the cold energy of the cold storage agent at the time of idle stop for cooling is used.

As such a conventional cold storage heat exchanger, the one described in Patent Document 1 is known.
The conventional cold storage heat exchanger of Patent Document 1 has a large number of flat pipes that are arranged in parallel to guide the refrigerant, and are connected to these flat pipes, and a cold storage medium (cold storage agent) is arranged inside. And a regenerator having at least one cold storage. Moreover, the evaporator which has two area | regions arranged in parallel mutually is provided, the 1st area | region is comprised with a conventional general evaporator among 2 area | regions, and the cold storage is incorporated in the 2nd area | region. Thus, this region is allowed to flow through at least a portion of the cryogen flow.
The cryogen flow flows through at least a portion of the first region, and the first and second regions are connected to each other by at least one overflow opening.

Special table 2009-525911

However, the conventional cold storage heat exchanger has problems as described below.
That is, in the conventional cold storage heat exchanger, the cold storage is arranged on the downstream side of the air flow of the evaporator, and the flat pipe flows the refrigerant of the evaporator inside, and the cold storage agent is placed on the outer peripheral side thereof. A regenerator on the downstream side of the running wind against the gap (with fins) through which the air flows between the tubes of the evaporator on the upstream side of the running wind because it has to be a large shape with a rectangular double pipe that fills up The gap (with fins) through which the air flows between the flat pipes in the horizontal direction is larger in the width direction, and the evaporator tube and the regenerator flat pipe are arranged in parallel in the width direction. It will shift.
As a result, the air resistance increases on the regenerator side, and as a result, the rate at which the cold heat of the air that has passed through the evaporator is propagated to the regenerator increases. is there.

  Moreover, since the pipe of the regenerator is a double flat pipe, there is a problem that the manufacturability is poor and the cost is high.

  The present invention has been made paying attention to the above-mentioned problems, and its object is to provide a regenerative heat exchanger that can suppress cost increase while suppressing deterioration of cool-down performance at engine start-up. It is to provide.

  For this purpose, the regenerator heat exchanger according to the present invention described in claim 1 includes an evaporator that vaporizes the refrigerant, and a regenerator that is provided in parallel with the evaporator and contains a regenerator, and flows through the evaporator. The regenerator has a plurality of tubes extending in a direction perpendicular to the flow direction of the air flow passing through the regenerator, and these tubes are circulated to the regenerator. A plurality of flow paths that are partitioned inside and extend in the orthogonal direction are formed, and these flow paths are arranged in series along the flow direction of the air flow, and are filled with the regenerator. The flow path and the refrigerant circulation path through which the refrigerant of the evaporator flows are arranged.

  The regenerator heat exchanger of the invention described in claim 2 is the regenerator heat exchanger according to claim 1, wherein the regenerator is partitioned by a partition plate and stores a regenerator. And a refrigerant storage section for storing the refrigerant, the first and second tanks separated from each other, the tube flow path provided at both ends thereof, The opening of the refrigerant circulation path is offset in the orthogonal direction, and one of the opening of the regenerator filling channel and the opening of the refrigerant circulation path communicates with the regenerator storage part, and the regenerator filling flow Both ends of the tube are offset by inserting both ends of the tube into the first and second tanks so that the other of the opening of the passage and the opening of the refrigerant circulation passage communicates with the refrigerant reservoir. The step formed between the parts is in contact with the partition plate Positioned with respect to the first and second tank cube is made, characterized by comprising a.

  Moreover, the cool storage heat exchanger of the invention described in claim 3 is the cool storage heat exchanger according to claim 1, wherein each of the cool storage units is partitioned by a partition plate and stores a cool storage agent. And a refrigerant storage section for storing the refrigerant, and are provided with a first tank and a second tank that are separated from each other, and provided at both ends of the tube, the openings of the regenerator filling flow path and the refrigerant circulation The opening of the passage is offset in the orthogonal direction, and one of the opening of the regenerator filling channel and the opening of the refrigerant circulation channel communicates with the regenerator storage unit, and the regenerator filling channel Both ends of the tubes are offset by inserting both ends of the tube into the first tank and the second tank so that the other of the opening and the opening of the refrigerant circulation path communicates with the refrigerant reservoir. The curvature part formed between the parts is in contact with the partition plate Positioned with respect to the first tank and the second tank tube is made, characterized in that.

In the regenerative heat exchanger according to the first aspect of the present invention, the inside of the tube is partitioned to form a plurality of flow paths extending in the orthogonal directions, and these flow paths are in the flow direction of the air flow. The regenerator filling flow path and the refrigerant circulation path are arranged in series so that the tube of the regenerator can be thinned, and as a result, the air flow in the regenerator is smoothly flown between the tubes. It is possible to flow and the tube position of the regenerator can be arranged according to the position of the tube of the evaporator, and the air resistance can be further reduced. Therefore, the air flow can be improved, thereby suppressing the deterioration of the cool-down performance at the time of starting the engine.
In addition, as described above, the flow path in the tube is alternately arranged in series with the regenerator filling flow path and the refrigerant circulation path, so that the manufacturing cost of the tube can be facilitated and a positioning structure such as a stepped portion can be provided. Thus, the structure on the tube attachment side (tank or the like) can be simplified, and the cost can be reduced.

  Moreover, in the regenerative heat exchanger according to the second aspect of the present invention, when the tube is attached to the tank, it is possible to simplify the positioning between them with a simple configuration called a step portion, and to improve the productivity. Can do.

  Further, in the regenerative heat exchanger according to the third aspect of the present invention, when the tube is attached to the tank, the simple configuration of the curvature portion enables easy positioning between them and improves the manufacturability. Can do. In addition, compared to the stepped portion, burrs are less likely to occur in the curved portion, and further, for example, the processing time during processing by a wire electric discharge machine can be shortened, and brazing can be easily performed. it can.

It is a perspective view which shows the whole structure of the cool storage heat exchanger of Example 1 of this invention. It is a cross-sectional view of the tube of FIGS. It is an expanded sectional view which shows the attachment structure of the tank and tube in the cool storage which comprises the cool storage heat exchanger of Example 1. FIG. It is a cross-sectional view which shows the modification of a tube. It is a figure which shows the modification 1 of the front-end | tip of a tube. It is a figure which shows the modification 2 of the front-end | tip of a tube.

Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.
[Example 1]

  The cold storage heat exchanger according to the first embodiment is mounted on a vehicle having an engine idle stop mechanism, and is applied to an air conditioning system thereof. In FIG. 1, the whole cool storage heat exchanger of Example 1 is shown.

In FIG. 1, an evaporator 1 evaporates the refrigerant circulating in the air conditioning system and cools the air supplied to the passenger compartment by the heat of vaporization, and has a well-known configuration. Therefore, description and illustration of the detailed structure are omitted here.

  The regenerator 2 is arranged in parallel with the evaporator 1 at a position on the vehicle rear side of the evaporator 1, that is, a position on the downstream side of the evaporator 1 when receiving traveling wind, and the longitudinal direction thereof is along the vehicle width direction. Mounted on the vehicle in the direction.

  The regenerator 2 is arranged in parallel with the upper refrigerant tank 3a, which is arranged at the uppermost side and is led by a part of the refrigerant that flows to the upstream side of the evaporator 1 and stores the refrigerant. An upper regenerator tank 3b for storing the heat storage agent, and a lower refrigerant tank 4a that is arranged at the lowermost side of the regenerator 2 and flows out of a part of the stored refrigerant to flow to the inlet of the evaporator 1. The lower cool storage agent tank 4b that is arranged in parallel directly above and stores the heat storage agent, and the core portion 7 provided between the upper cool storage agent tank 3b and the lower cool storage agent tank 4b. Yes.

The upper refrigerant tank 3a and the upper regenerator tank 3b are assembled together to form the upper tank T1, and the lower refrigerant tank tank 4a and the lower regenerator tank 4b are integrally formed. The lower tank T2 is assembled.
One of the upper regenerator tank 3b and the lower regenerator tank 4b corresponds to the first tank of the present invention, and the other corresponds to the second tank of the present invention.

  The core portion 7 is disposed on both side ends, and the reinforcing plates 8a and 8b connecting the upper and lower regenerator tanks 3b and 4b, respectively, and between the upper and lower refrigerant tanks 3a and 4a. The fins disposed between the tubes 5 adjacent to each other and the plurality of tubes 5 in which the cool storage agent is put in communication between the upper and lower cool storage agent tanks 3b and 4b. 6 and.

FIG. 2 shows a cross section of the tube 5.
As shown in the figure, the tube 5 has a rectangular cross section with rounded ends, and is along the flow direction of the air flow (vehicle longitudinal direction) when the fan is driven or running while stopped. The three flow paths 5a, 5b, 5c are arranged in series and extend in a direction perpendicular to the air flow direction (direction perpendicular to the paper surface).

In this embodiment, the three flow paths 5a, 5b, and 5c are arranged in order from the upstream side to the downstream side of the wind, in the flow path 5a, in the flow storage 5b, in the flow path 5b, in the refrigerant, and in the flow path 5c. Each has a regenerator that can be distributed.
Alternatively, instead of the above, the refrigerant can flow in the flow path 5a, the cool storage agent in the flow path 5b, and the refrigerant in the flow path 5c.
That is, the refrigerant and the cold storage agent are alternately arranged in the three flow paths 5a, 5b, and 5c. Of the three flow paths 5a, 5b, and 5c, the flow path through which the refrigerant flows constitutes the refrigerant circulation path of the present invention, and the flow path filled with the cold storage agent forms the cold storage agent filling path.

One of these ends of the tube 5 is connected to the upper tank T1, and the other is connected to the lower tank T2.
These connection structures have the same configuration although the vertical direction is reversed.
Therefore, only the upper connection structure in FIG. 3 is shown, and the lower connection structure is not shown and described.

As shown in FIG. 3, the upper refrigerant tank 3a and the upper regenerator tank 3b are configured as an integral upper tank T1 as follows.
That is, the side wall portions 9a on one side (right side in FIG. 3) and the other side (on the right side in FIG. Side wall portion 9b, ceiling wall portion 9c, and bottom wall portion 9d are formed, and the opening at both ends thereof is closed with a lid member to constitute the upper tank T1.
A plurality of first tube holes 11 are provided at a position corresponding to the bottom portion 9d of the plate 9, and an upper end portion of the tube 5 can be inserted.

One end of the partition plate 8 is inserted into the gap 10 of the upper tank T1, and the other end of the partition plate 8 comes into contact with the inner peripheral surface of the other side wall 9b (left side in FIG. 3) of the upper tank T1. In this way, the partition plate 8 is inserted into the upper tank T1, and the internal space of the upper tank T1 is divided into two vertically. The upper space is a refrigerant storage unit 30, and the lower space is a cold storage agent storage unit 40.
The partition plate 8 is provided with a second tube hole 12 having the same width as the first tube hole 11 but having a shorter length corresponding to the position where the tube 5 is attached, and the protruding portion of the flow path 5b of the tube 5 Can be inserted.
The upper tank T1 is integrated by brazing while being positioned using a jig.

On the other hand, since the tube 5 is a cool storage agent flow path 5a, a coolant flow path 5b, and a cool storage agent flow path 5c along the air flow direction, the distal end portion of the coolant flow path 5b in the center However, it is longer than the tip of the cool storage agent flow paths 5a, 5c on both sides, and is formed in a convex shape.
That is, the tip portions of the flow paths 5a and 5c of the regenerator are tapered such that the tip portions become lower from the stepped portion S provided in the middle of the tip portion of the refrigerant flow channel 5b toward the both ends. Is formed. As a result, the openings at the tip portions of the flow paths 5a and 5c of the regenerator are inclined, so that the opening area is increased as compared with the case where the tip portions are not tapered.

The distal end portion of the tube 5 formed as described above is inserted from the first tube hole 11 of the bottom wall portion 9d of the upper tank T1 until the stepped portion S hits the lower surface of the partition plate 8, and the contact position thereof. With respect to the partition plate 8, and thus the upper tank T1.
At this time, the tip portion of the flow path 5a, 5c of the cool storage agent is between the inner surface of the bottom wall portion 9d and the lower surface of the partition plate 8, and their opening comes to face the cool storage agent storage unit 40, The front end portion of the refrigerant flow path 5b passes through the second tube hole 12 of the partition plate 8 and protrudes from the upper surface of the partition plate 8 so that the opening faces the refrigerant storage portion 30.

The connection structure between the lower tank T2 and the lower end portion of the tube 5 is omitted, but the direction is the same as that of the upper tank except that the direction is upside down as described above. . In the regenerator heat exchanger configured as described above, all parts are made of aluminum or aluminum alloy, and are integrated by brazing.
As the refrigerant, for example, HFC-134a is used, and as the cold storage agent, for example, decanol, tetradecane, pentadecane, hexadecane, paraffin, or the like is used.

Next, the effect | action of the cool storage heat exchanger of Example 1 is demonstrated below. When the ignition key is turned on and the engine is driven, the air conditioning system can be activated.
When this switch is turned on to activate the air conditioning system, the magnet clutch is engaged and the compressor is driven by the engine. Therefore, the refrigerant discharged from the compressor circulates through components such as the condenser and receiver of the well-known air conditioning system, and when the driver selects cooling, the evaporator 1 enters the vehicle interior. Cool the supplied air.

At this time, a part of the refrigerant on the upstream side of the evaporator 1 flows into the refrigerant tank 3a on the upper side of the flow path 5b of the regenerator 2, and passes through the refrigerant flow path 5b of the tube 5 from here. The refrigerant flows to the refrigerant tank 3a on the side, and flows from here to the inlet of the evaporator 1.
Since this refrigerant is cooled while the engine is running, when the refrigerant passes through the refrigerant flow path 5b of the tube 5 after starting, the cold storage agent in the refrigerant storage flow paths 5a and 5c adjacent to this is cooled from both sides. To do.

Thereafter, when the vehicle is temporarily stopped, for example, for waiting for a signal or looking at a map, the engine is automatically stopped by an idle stop function. Then, the compressor is also stopped, so that the refrigerant is no longer cooled by the condenser or the like.
However, even when the engine is stopped due to the temporary stop, it is possible to continue the cooling by cooling the air supplied to the passenger compartment by the cool heat of the cool storage agent cooled in the heat accumulator 2 during traveling.
After that, if the vehicle travels again, the cool storage agent that has been warmed by heat exchange with air at the time of idle stop is also cooled to store the cold energy to prepare for the next idle stop.

As can be seen from the above description, the cold storage heat exchanger according to the first embodiment has the following effects.
That is, in the cold storage heat exchanger according to the first embodiment, the tube 5 includes a plurality of flow paths arranged in series in the flow direction of the air flow, and the flow paths are alternately arranged with the cool storage agent filling flow path and the refrigerant circulation path. As a result, it can be manufactured easily and inexpensively by extrusion molding, etc., the thickness can be reduced to reduce the air resistance, and the tube 5 of the regenerator 2 is connected to the upstream side of the evaporator 1. Alignment with the tube can be achieved, and air resistance can be further reduced, and deterioration of the cool-down property can be prevented even when the engine is started.

  In addition, since the flow paths are arranged in series as described above, when the lengths of the front end portion of the regenerator filling flow path and the front end portion of the refrigerant circulation path are made different from each other, a step portion is formed in the connecting portion. S can be provided, and by contacting the stepped portion S to the partition plate 8, the tube 8 and the upper tank T1 can be easily positioned, and the manufacturing is simplified.

  The present invention has been described based on the above embodiments. However, the present invention is not limited to these embodiments, and is included in the present invention even when there is a design change or the like without departing from the gist of the present invention. .

The tube 5 can be modified as described in the first embodiment as described below.
For example, as shown in FIG. 4, the cross section of the tube 5 is provided with flow paths 5a, 5b, 5c as in the structure of FIG. 2, and a partition plate 5d is further inserted to each of the flow paths 5a, 5b, 5c. It is good also as tube 5 'divided | segmented up and down. In this case, a material with good heat transfer is used for the partition plate 5d. This makes it possible to increase the heat exchange area between the refrigerant and the cold storage agent.

Further, the stepped portion S is not limited to that of the first embodiment, and may be shaped as shown in FIG.
That is, as shown in FIG. 5 (a), the stepped portion does not start from the middle of the tip of the channel 5b, but the tip of the channel 5a, 5c is tapered, and the stepped portion is formed at the tip of the channel 5b. After extending horizontally from the middle of the part, it is tapered, or as shown in the figure (b), it is not tapered, but it is an opening that extends horizontally at the part that descends downward from the protruding part. May be.
In this case, by positioning these stepped portions S against the partition plate 8, the tube 8 and the upper tank T1 can be positioned easily.

Further, the stepped portion S is not limited to that of the first embodiment, and may be shaped as shown in FIG.
That is, as shown in FIG. 5A, instead of the stepped portion, a curved portion S directed from the middle of the tip portion of the flow path 5b toward the outer edge of the tube (outside of the flow paths 5a and 5c) may be used.
In this case, similarly to the stepped portion S, the curved portion S is brought into contact with the partition plate 8, whereby the tube 8 and the upper tank T1 can be easily positioned. In addition, as compared with the stepped portion S, burrs are less likely to occur in the curved portion R.
In addition, for example, when processing the stepped portion S at the time of processing by a wire electric discharger, it is necessary to slow down the processing speed. There is no need to slow down, and the processing time can be shortened.
In addition, as shown in FIG. 5B, the gap C between the edge of the second tube hole 12 of the partition plate 8 and the curvature portion R gradually becomes narrower toward the cool storage agent storage portion 40 side. It is possible to prevent the cool storage agent storage unit 40 from dripping down, and brazing can be easily performed.

If the number of the flow paths in which the tubes 5 are arranged in series is two or three, the number of holes of the second tube holes 12 in the partition plate 8 can be reduced, and the manufacturing is simplified.
In the above embodiment, the refrigerant is allowed to flow from the upper tank to the lower tank. However, the present invention is not limited to this, and the refrigerant may flow in the opposite direction.
Moreover, in the said Example, although only the one part refrigerant | coolant which flows into an evaporator was made to flow in into a regenerator, you may make it all flow.

1 ... Evaporator
2 ... Cooler
3a… Upper refrigerant tank (second tank)
3b ... Lower refrigerant tank (first tank)
4a… Upper refrigerant tank (second tank)
4b ... Lower regenerator tank (first tank)
5, 5 '... Tube
5a, 5b, 5c ... Flow path
5d ... Partition plate
6 ... Fin
7… Core part
8a, 8b ... Reinforcing plate
9 ... Plate
9a, 9b ... sidewall portions
9c… Ceiling wall part
9d ... Bottom wall part
10 ... Gap
11 ... 1st tube hole
12 ... Second tube hole
30 ... Refrigerant reservoir
40 ... Cold storage agent storage
S ... Step
R ... curvature part
T1… Upper tank
T2 ... Lower tank

Claims (3)

In a cold storage heat exchanger comprising: an evaporator that vaporizes a refrigerant; and a regenerator that is provided in parallel with the evaporator and that contains a regenerator, wherein the refrigerant flowing through the evaporator is circulated to the regenerator.
The regenerator has a plurality of tubes extending in a direction orthogonal to the flow direction of the air flow passing through the regenerator,
Each of the tubes has a plurality of flow paths that are partitioned inside and extend in the orthogonal direction.
The flow paths are arranged in series along the flow direction of the air flow, and a regenerator filling flow path filled with the regenerator and a refrigerant circulation path through which the refrigerant flows are arranged.
A regenerative heat exchanger characterized by that. The regenerative heat exchanger according to claim 1,
The regenerator has a first storage tank and a first tank separated from each other, each of which is partitioned by a partition plate to define a regenerator storage part for storing the regenerator and a refrigerant storage part for storing the refrigerant. With two tanks,
The opening of the regenerator filling flow path and the opening of the refrigerant circulation path provided at both ends of the tube are offset in the orthogonal direction so that the opening of the regenerator filling flow path and the refrigerant circulation One of the openings of the passage communicates with the cold storage agent storage section, and the other of the opening of the cold storage agent filling flow path and the opening of the refrigerant circulation path communicates with the refrigerant storage section. As described above, both end portions of the tube are inserted into the first tank and the second tank, respectively.
A step formed between the offset openings is brought into contact with the partition plate to position the tube with respect to the first tank and the second tank;
A regenerative heat exchanger characterized by that. The regenerative heat exchanger according to claim 1,
The regenerator has a first storage tank and a first tank separated from each other, each of which is partitioned by a partition plate to define a regenerator storage part for storing the regenerator and a refrigerant storage part for storing the refrigerant. With two tanks,
The opening of the regenerator filling flow path and the opening of the refrigerant circulation path provided at both ends of the tube are offset in the orthogonal direction so that the opening of the regenerator filling flow path and the refrigerant circulation One of the openings of the passage communicates with the cold storage agent storage section, and the other of the opening of the cold storage agent filling flow path and the opening of the refrigerant circulation path communicates with the refrigerant storage section. As described above, both end portions of the tube are inserted into the first tank and the second tank, respectively.
A curvature portion formed between the offset openings is brought into contact with the partition plate to position the tube with respect to the first tank and the second tank.
A regenerative heat exchanger characterized by that.

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