JP6976746B2 - Cold storage heat exchanger - Google Patents

Description

The present invention relates to a cold storage heat exchanger provided with a cold storage case together with a refrigerant tube.

As a cold storage heat exchanger of this type, there is one disclosed in Patent Document 1 and the like. In such a laminated cold storage heat exchanger, the atmosphere side fins are extracted, a cold storage container is sandwiched between the fins, and in a brazed cold storage evaporator, the refrigerant tube and the cold storage container are formed by aligning the plates in the middle. Brazing material layers are provided on both sides of the plate.

Japanese Unexamined Patent Publication No. 2011-12947

However, in the cold storage heat exchanger according to the prior art, the brazing material melts during brazing, and the thickness of the brazing material layer becomes smaller.

Therefore, there is an inconvenience that the amount of change in the stacking direction differs between the tank forming portion and the sandwiching portion of the cold storage container, which affects the airtightness between the tank forming portion and the intermediate mating portion of the cold storage container.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cold storage heat exchanger capable of improving airtightness in the stacking direction.

In order to achieve the above object, the cold storage heat exchanger according to the present invention is provided at both ends of a heat exchange section for heat exchange between the refrigerant flowing inside and the air flowing around the inside, and inside the heat exchange section. The heat exchange section and the tank section are combined with each other to form a refrigerant tube and the heat exchange section of the refrigerant tube. It is provided with a cold storage case which is arranged between two adjacent refrigerant tubes in a state of being in contact with each other and is formed by uniting the two case divisions, and the surfaces of the tube division and the case division which are in contact with each other are brought into contact with each other. In the cold storage heat exchanger to be brazed, at least one of the case splits is provided with an extension plate portion interposed between the tank portions of the two tube splits forming the refrigerant tube.

An object of the present invention is to provide a cold storage heat exchanger capable of improving airtightness in the stacking direction.

It is an exploded perspective view which shows the cold storage heat exchanger which concerns on embodiment. It is a perspective view which shows the refrigerant path of the cold storage heat exchanger which concerns on embodiment. FIG. 3 is a cross-sectional view taken along the line AA of FIG. It is a schematic block diagram which shows the structural example of the main part (tank part, the refrigerant tube and the cold storage case) of the cold storage heat exchanger as a comparison target. It is a schematic block diagram which shows the structural example of the main part (tank part, the refrigerant tube and the cold storage case) of the cold storage heat exchanger which concerns on 1st Embodiment. It is a schematic block diagram which shows the structural example of the main part (tank part, the refrigerant tube and the cold storage case) of the cold storage heat exchanger which concerns on 2nd Embodiment.

Hereinafter, the configurations of the tank portion, the refrigerant tube, and the cold storage case of the cold storage heat exchanger according to the embodiment and the cold storage heat exchanger according to the first and second embodiments will be described with reference to the drawings.

(Outline configuration of cold storage heat exchanger)
First, a schematic configuration of the cold storage heat exchanger 1 according to the embodiment will be described with reference to FIGS. 1 to 3.

Here, FIG. 1 is an exploded perspective view showing the cold storage heat exchanger 1, FIG. 2 is a perspective view showing a refrigerant path of the cold storage heat exchanger 1, and FIG. 3 is a sectional view taken along line AA of FIG. ..

The cold storage heat exchanger 1 as an evaporator constitutes a refrigeration cycle together with a compressor, a condenser, an expansion valve and the like (not shown). Refrigeration cycles are applied to vehicle air conditioners.

The compressor is driven by the rotational force of the engine and stops when the engine stops. That is, at the time of idle stop, the compressor is stopped and the flow of the refrigerant to the cold storage heat exchanger 1 is also stopped. The cold storage heat exchanger 1 is arranged in the air passage of the air conditioning unit (not shown). The air supplied to the air passage is blown into the vehicle interior through the cold storage heat exchanger 1 and the like.

As shown in FIG. 1, the cold storage heat exchanger 1 has a plurality of outer fins arranged in a gap between a plurality of refrigerant tubes 2 and 2A arranged in parallel at intervals and adjacent refrigerant tubes 2 and 2A. 3 is provided with a plurality of cold storage cases 4 arranged in a gap between the adjacent refrigerant tubes 2 and 2A and in which the outer fin 3 is not interposed.

The cold storage heat exchanger 1 is installed in a direction in which the refrigerant flows in the vertical direction in the refrigerant tube 2 (installed in the direction shown in FIG. 2). The parts are brazed and joined at points where they are in contact with each other.

The refrigerant tube 2 is made of an aluminum material. The refrigerant tube 2 is formed by superimposing two heat transfer plates 21. The refrigerant tube 2 has two communication holes 22 at both ends. Some refrigerant tubes 2 do not have communication holes 22, and some of them have closed ends. This is because the refrigerant flow has multiple paths.

The refrigerant tube 2 has two refrigerant passages 23 that communicate between the two communication holes 22 at both ends. The two refrigerant passages 23 are completely separated by being partitioned by a recessed wall portion 24 on the outer wall of each heat transfer plate 21. Each refrigerant passage 23 extends along the direction orthogonal to the air flow. Inner fins 25, which are heat transfer members, are arranged in each refrigerant passage 23.

As shown in FIG. 2, in the laminated group of the refrigerant tubes 2, the upstream side of the air flow (refrigerant passage group) is the first heat exchange section 11, and the downstream side of the air flow (refrigerant passage group) is the second heat exchange. It is said to be part 12. The outlet of the first heat exchange unit 11 and the inlet of the second heat exchange unit 12 are communicated with each other by, for example, a communication pipe 13. The refrigerant flowing in from the outside flows in a zigzag manner in the laminated body of the refrigerant tube 2 as shown by the arrow shown in FIG. 2, flows through the second heat exchange unit 12 (for example, 3 passes), and then flows through the first heat exchange unit 11 (for example, 3). It flows through the path) and flows out to the outside. In FIG. 2, reference numeral 14 indicates a position where the communication hole 22 is not formed in the refrigerant tube 2.

The refrigerant tube 2A on one side of the cold storage case 4 has a different configuration from the other refrigerant tubes 2.

The outer fin 3 is made of an aluminum material. The outer fin 3 has a wavy shape when viewed from the direction of air flow. The air passing between the adjacent refrigerant tubes 2 in which the outer fins 3 are arranged passes through the gap formed by the outer fins 3 and the refrigerant tubes 2.

The cold storage cases 4 are smaller than the number of laminated refrigerant tubes 2 and are arranged at equal intervals. The cold storage case 4 is made of an aluminum material. The cold storage case 4 is filled with a cold storage material (not shown) inside. The cold storage case 4 is formed by stacking two case plates 41 on top of each other. The cold storage case 4 is in contact with the refrigerant tubes 2 and 2A on both sides. Therefore, air does not pass between the cold storage case 4 and the refrigerant tubes 2 and 2A. The cold storage case 4 is in surface contact with the refrigerant tubes 2 and 2A over almost the entire side surface thereof. This is to increase the heat conduction efficiency of both as much as possible.

One of the refrigerant tubes 2A of the cold storage case 4 has a shielding portion 26 that does not completely allow the refrigerant to flow in the refrigerant passage 23. The shielding portion 26 is arranged at the upper end position of the refrigerant passage 23 of one of the refrigerant tubes 2A. The shielding portion 26 is formed by press-molding each heat transfer plate 21. The shielding portions 26 of both heat transfer plates 21 are brazed and joined to each other at their apex portions. The shielding portion 26 has a vertical wall portion 26a and two horizontal wall portions 26b and 26c extending diagonally to the left and right from both ends of the vertical wall portion 26a. The shielding portion 26 doubles the refrigerant passage 23 by two side wall portions 26b and 26c.

The other refrigerant tube 2 of the cold storage case 4 does not have a shielding portion 26 in the refrigerant passage 23, and is configured so that the refrigerant flows.

Further, as shown in FIG. 1, a tank portion T in which a refrigerant is stored or circulated is configured by a plurality of communication holes 22 joined to each other.

Although detailed configuration examples (first embodiment and second embodiment) will be described later, in the cold storage case 4, two tube divisions forming the refrigerant tubes 2 and 2A are formed on at least one of the case divisions 41 and 41. An extension plate portion P interposed between the tank portions T of the body (heat transfer plate 21) is provided (the configuration shown in FIG. 1 corresponds to the first embodiment described later).

Further, a brazing material layer (not shown in FIG. 1) is formed on each surface of the refrigerant tubes 2 and 2A, the cold storage case 4, and the extension plate portions P (P1, P2).

With such a configuration, the number of layers of the brazing material layer can be the same or similar in the whole or at least a part of the cold storage case 4. As a result, the amount of change in the stacking direction can be reduced between the tank forming portion and the sandwiching portion of the cold storage container, and the airtightness at the tank forming portion and the middle mating portion of the cold storage container can be improved.

Further, the extension plate portion P can also serve as a positioning portion of the cold storage case 4, and the cold storage case 4 can be assembled at an accurate position to improve the accuracy of the entire cold storage heat exchanger 1.

(Regarding the configuration of the main parts of the cold storage heat exchanger)
Next, with reference to the schematic configuration diagrams of FIGS. 4 to 6, a configuration example, a first embodiment, and a second embodiment of a main part (tank portion, refrigerant tube, and cold storage case) of the cold storage heat exchanger 100 as a comparison target. A configuration example of the main parts (tank part, refrigerant tube and cold storage case) of the cold storage heat exchangers 1A and 1B according to the embodiment will be described.

As described above, in the cold storage heat exchanger 1 (1A, 1B) according to the present embodiment, the heat exchange unit (first heat exchange unit 11, It has a second heat exchange section 12) and a tank section T provided at both ends of the heat exchange sections 11 and 12 for performing a partial mixing flow of the refrigerant flowing inside.

Further, the heat exchange portions 11 and 12 and the tank portion T come into contact with the refrigerant tubes 2 and 2A formed by combining the two tube split bodies (heat transfer plates 21) and the heat exchange portions 11 and 12 of the refrigerant tubes. It is provided between two refrigerant tubes 2 and 2A that are adjacent to each other in the state, and has a cold storage case 4 formed by combining the two case divided bodies 41 and 41.

Further, the surfaces of the tube dividing body 21 and the case dividing bodies 41 and 41 that are in contact with each other are brazed to each other.

An extension plate portion P interposed between the tank portions T of the two tube split bodies 21 forming the refrigerant tubes 2 and 2A is provided on at least one of the case split bodies 41a and 41b.

A brazing material layer L (L1 to L18) is formed on the surfaces of the refrigerant tubes 2 and 2A, the cold storage cases 4 (41a and 41b), and the extension plate portions P1 and P2.

(First Example)
A specific example of the brazing material layer L in the cold storage heat exchanger 1A according to the first embodiment will be described with reference to FIG.

As shown in FIG. 5, the communication holes 22a forming a part of the tank portion T have brazing material layers L1 and L2 parallel to each other in the longitudinal direction.

Similarly, the communication holes 22b forming a part of the tank portion T have brazing material layers L3 and L4 parallel to each other in the longitudinal direction.

As shown in FIG. 5, the heat transfer plate 21a constituting the tube split body has brazing material layers L11 and L12 parallel to each other in the longitudinal direction.

Similarly, the heat transfer plate 21b constituting the tube split body has brazing material layers L17 and L18 parallel to each other in the longitudinal direction.

Further, as shown in FIG. 5, the cold storage case 41a has brazing material layers L13 and L14 parallel to the longitudinal direction.

Similarly, the other cold storage case 41b has brazing material layers L15 and L16 parallel to the longitudinal direction.

In the cold storage heat exchanger 1A according to the first embodiment, extension plate portions P1 and P2 are provided on both of the case dividing bodies 41a and 41b, and between the communication holes 22a and 22b forming a part of the tank portion T. It is sandwiched between.

The configuration of each corresponding portion in the stacking direction shown in FIG. 1 is the same as that in FIG.

Then, as shown in FIG. 1, the layers are heated and then cooled in a laminated state, and the entire brazing heat exchanger 1A is coupled by melting and solidifying the brazing material layers L (L1 to L18).

Here, with reference to FIG. 5 showing the cold storage heat exchanger 1A according to the first embodiment and FIG. 4 showing the cold storage heat exchanger 100 as a comparison target, the rows in the predetermined ranges H1, H2 and H10, H20 Compare the number of material layers.

The predetermined ranges H1, H2 and H10, H20 are the ranges including the communication holes 22a and 22b and the positions of the cold storage case 4 excluding L1, L4 and L11 and L18 corresponding to the outermost layer.

First, the number of layers of the brazing material layer L in the range H1 of the cold storage heat exchanger 1A according to the first embodiment is a total of 6 layers of L2, L13, L14, L15, L16, and L3.

On the other hand, it can be seen that the number of layers of the brazing material layer L in the range H2 is 6 layers in total of L12 to L17, which is the same as the number of layers of the brazing material layer L in the range H1.

On the other hand, in the cold storage heat exchanger 100 as a comparison target, the number of layers of the brazing material layer L in the range H10 is a total of two layers L2 and L3.

On the other hand, the number of layers of the brazing material layer L in the range L20 is a total of 6 layers L12 to L17, and it can be seen that there is a relatively large difference in the number of layers between the two layers, which is a difference of 4 layers.

Due to such a difference in the number of layers of the brazing material layer L, in the cold storage heat exchanger 100 as a comparison target, the amount of change in the stacking direction differs between the tank forming portion and the sandwiching portion of the cold storage container before and after brazing, and the tank is formed. There was an inconvenience that it affected the airtightness of the part and the middle part of the cold storage container.

On the other hand, in the cold storage heat exchanger 1A according to the first embodiment, as described above, the number of layers of the brazing material layer L in the ranges H1 and H2 is the same for each of 6 layers, so that they are laminated before and after brazing. The amount of change in direction can be minimized, and the airtightness in the stacking direction can be improved.

Further, since the extension plate portions P (P1, P2) also serve as the positioning portion of the cold storage case 4, the cold storage case 4 can be assembled at an accurate position to improve the accuracy of the entire cold storage heat exchanger 1A.

(Second Example)
A specific example of the brazing material layer L in the cold storage heat exchanger 1B according to the second embodiment will be described with reference to FIG.

Here, the same components as those of the cold storage heat exchanger 1A according to the first embodiment are designated by the same reference numerals, and duplicated description will be omitted.

The difference between the cold storage heat exchanger 1B according to the second embodiment and the cold storage heat exchanger 1A according to the first embodiment is that the extension plate portion P1 is provided only in the case dividing body 41a, and a part of the tank portion T. It is a point sandwiched between the communication holes 22a and 22b constituting the above.

The configuration of each corresponding portion in the stacking direction is the same as that in FIG.

Then, it is cooled after being heated in a laminated state, and the entire cold storage heat exchanger 1B is bonded by melting and solidifying each brazing material layer L (L1 to L18).

Here, with reference to FIG. 6 showing the cold storage heat exchanger 1B according to the second embodiment and FIG. 4 showing the cold storage heat exchanger 100 as a comparison target, the rows in the predetermined ranges H3, H2 and H10, H20. Compare the number of material layers.

The predetermined ranges H3, H2 and H10, H20 are the ranges including the communication holes 22a and 22b and the positions of the cold storage case 4 excluding L1, L4 and L11 and L18 corresponding to the outermost layer.

The number of layers of the brazing material layer L in the range H3 of the cold storage heat exchanger 1B according to the second embodiment is a total of four layers of L2, L13, L14, and L3.

On the other hand, the number of layers of the brazing material layer L in the range H2 is 6 layers in total of L12 to L17, and it can be seen that the number of layers of the brazing material layer L in the range H3 is two layers different.

On the other hand, in the cold storage heat exchanger 100 as a comparison target, there was a difference of four layers in the ranges H10 and H20 as described above.

As described above, in the cold storage heat exchanger 1B according to the second embodiment, the difference in the number of layers of the brazing material layer L in the ranges H3 and H2 can be suppressed to two layers, which is compared with the cold storage heat exchanger 100 as a comparison target. As a result, the amount of change in the stacking direction can be suppressed before and after brazing, and the airtightness in the stacking direction can be improved.

Further, since the extension plate portion P1 also serves as a positioning portion of the cold storage case 4, the cold storage case 4 can be assembled at an accurate position to improve the accuracy of the entire cold storage heat exchanger 1B.

The same effect can be obtained by sandwiching only the extension plate portion P2 between the communication holes 22a and 22b forming a part of the tank portion T instead of the extension plate portion P1.

Although the invention made by the present inventor has been specifically described above based on the embodiments, the embodiments disclosed in the present specification are exemplary in all respects and are not limited to the disclosed technology. Should be considered not. That is, the technical scope of the present invention should not be construed in a restrictive manner based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. Includes all changes within the scope of the claims and claims as well as the techniques described in.

1, 1A, 1B ... Cold storage heat exchanger 2, 2A ... Refrigerant tube 4 ... Cold storage case 11 ... First heat exchange section 12 ... Second heat exchange section 21, 21a, 21b ... Heat transfer plates 22, 22a, 22b ... Communication Holes 41, 41a, 41b ... Case splitting body L (L1 to L18) ... Row material layers P, P1, P2 ... Extension plate portion T ... Tank portion

Claims (2)

It has a heat exchange section where the refrigerant flowing inside exchanges heat with the air flowing around the inside, and a tank section provided at both ends of the heat exchange section and performing a partial mixing flow of the refrigerant flowing inside. A refrigerant tube in which the exchange part and the tank part are formed by combining two tube split bodies, and
It is provided with a cold storage case which is arranged between two adjacent refrigerant tubes in a state of being in contact with the heat exchange portion of the refrigerant tube and is formed by coalescing two case divided bodies.
In a cold storage heat exchanger in which the surfaces of the tube split body and the case split body that are in contact with each other are brazed to each other.
The cold storage case extends to the tank portions provided at both ends.
At least one of the case splits is provided with an extension plate portion interposed between the tank portions provided at both ends of the two tube splits forming the refrigerant tube .
A brazing material layer is formed on each surface of the refrigerant tube, the cold storage case, and the extension plate portion.
A cold storage heat exchanger characterized in that the tube split body and the case split body overlap each other, and the refrigerant tube and the cold storage case are joined via the brazing material layer. The cold storage heat exchanger according to claim 1 , wherein the extension plate portion also serves as a positioning portion of the cold storage case.

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