JP7323975B2 - Laminated plate heat exchanger - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reducing pressure loss in a plate laminated heat exchanger.

Conventionally, as a plate laminated heat exchanger that can be used as a cooler for electronic devices such as inverters, there is a cup plate type in which laminated inner plates are wrapped using a cup plate-shaped top plate or bottom plate, as shown in FIG. are known.
The inner plate of this heat exchanger is formed by forming a large number of rectangular holes in a flat plate, and arranging a bridging portion and a column portion around the rectangular holes. A refrigerant is circulated in a meandering manner.

WO2017/159880

Such a plate-laminated heat exchanger has a drawback that the pressure loss associated with the circulation of the refrigerant is relatively high and a large driving pressure is required for the circulation.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a laminated plate heat exchanger that reduces pressure loss without significantly deteriorating the heat transfer performance of the heat exchanger.

The present invention according to claim 1 comprises an upper plate 1 arranged at one end in the stacking direction, a lower plate 2 arranged at the other end, and a plurality of inner plates 3 stacked between the plates. In the plate-laminated heat exchanger in which the heat exchange medium flows between the inner plates 3,
In the inner plate 3, a large number of fin portions 3a arranged parallel to the flow direction of the heat exchange medium and a large number of bridging portions 3b connecting the fin portions 3a are integrally arranged in a plane and laminated. The bridging portions 3b of the inner fins adjacent to each other in the direction are arranged in mutually different positions in the flow direction of the heat exchange medium,
At least one of the inner plates 3 forms a less cross-linked inner plate 4 having a smaller number of cross-linked portions 3b than the other inner plates 3, and
This is a plate-laminated heat exchanger in which the slightly cross-linked inner plate 4 is positioned at least in either the uppermost layer on the upper plate 1 side or the lowermost layer on the lower plate 2 side.

The present invention according to claim 2 is the plate laminated heat exchanger according to claim 1,
At least one of the inner plates 3 forms a small fin inner plate 5 having a smaller number of fins 3a than the other inner plates 3, and the small bridge inner plate 4 or the small fin inner plate 5 is located on the upper plate 1 side. or the bottom layer on the lower plate 2 side.

In the first aspect of the invention, the lightly cross-linked inner plate 4 having a small number of cross-linked portions 3b is positioned on at least one of the uppermost layer on the upper plate 1 side and the lowermost layer on the lower plate 2 side. As a result, the flow resistance in the slightly bridged inner plate 4 is reduced, and the pressure loss is reduced.
In addition, as the fluid contact area of the upper plate 1 or the lower plate 2 increases, the flow rate of the fluid in the vicinity thereof increases, and the heat transfer coefficient between the upper plate 1 or the lower plate 2 and the fluid improves. The effect of heat transfer reduction due to the reduction of the portion 3b is mitigated. As a result, the pressure loss is reduced without greatly deteriorating the heat transfer, and the heat exchange performance is improved as a whole.

In the second aspect of the present invention, the less-bridging inner plate 4 or the less-finned inner plate 5 is positioned on at least one of the uppermost layer on the upper plate 1 side and the lowermost layer on the lower plate 2 side. As a result, the flow resistance in the small fin portion inner plate 5 is reduced.
In addition, as the fluid contact area of the upper plate 1 or the lower plate 2 increases, the flow rate of the fluid in the vicinity thereof increases, and the heat transfer coefficient between the upper plate 1 or the lower plate 2 and the fluid improves. The effect of heat transfer resistance due to the reduction of the portion 3b or the fin portion 3a is alleviated. As a result, pressure loss is reduced without significantly deteriorating heat transfer performance.

FIG. 2 is a plan view of an inner plate 3 and a slightly crosslinked inner plate 4 that constitute the plate laminate type heat exchanger of the present invention, wherein (A) is a plan view of the slightly crosslinked inner plate 4 and (B) is a slightly crosslinked inner plate 4 . and an inner plate 3 are combined. Assembly perspective view (A) of the same core 10, and BB sectional view (B) of (A). FIG. 2 is an exploded perspective view showing the whole plate-laminated heat exchanger. FIG. 11 is an exploded perspective view showing the whole plate-laminated heat exchanger of another embodiment. (A) is a plan view of a plate obtained by combining a small-fin portion inner plate 5 and a small-bridge inner plate 4, and (B) is a plan view of a core 10 showing a combined state of the sag and the inner plate 3. FIG. (A) is a longitudinal cross-sectional view of a heat exchanger in which a united plate of a small fin portion inner plate 5 and a small bridge inner plate 4 is arranged in the first stage, and (B) is the same plate in the first stage and the eighth stage. FIG. 4 is a vertical cross-sectional view of the arranged heat exchangers; Shows a performance comparison between the heat exchanger shown in FIG. 2 (B) and the heat exchanger shown in FIG. and a comparison of pressure loss. FIG. 2 is a vertical cross-sectional view of a conventional plate-laminated heat exchanger.

Next, embodiments of the present invention will be described based on the drawings.

1 to 3 show a plate laminate type heat exchanger of the present invention, FIG. 1(A) is a plan view of a slightly crosslinked inner plate 4 which is one of its constituent elements, and FIG. 2(A) is an exploded perspective view of the core 10; FIG. 2(B) is a cross-sectional view taken along line BB of FIG. 2(A); FIG. 3 is an exploded perspective view showing the whole plate-laminated heat exchanger.
The feature of this embodiment is that it has a large number of inner plates 3 forming the core 10 of the heat exchanger, and a slightly bridged inner plate 4 arranged at the uppermost stage.
Each inner plate 3 has a large number of fins 3a parallel to the flow direction of the heat exchange medium 6 (FIGS. 2A and 2B) and bridges 3b integrally connecting the fins 3a. . At the same time, the positions of the laminated bridge portions 3b are different from the positions of the bridge portions 3b of the adjacent plates.

Next, the lightly bridged inner plate 4 is composed of a large number of fins 3a parallel to the flow direction of the heat exchange medium 6 and bridges 3b connecting the fins 3a. In this example, the distance between the bridging portions 3b is twice the distance between the bridging portions 3b of the other inner plate 3. As shown in FIG. In addition, the position of the bridging portion 3b in the slightly bridging inner plate 4 and the position of the bridging portion 3b adjacent thereto are arranged differently in the flow direction of the heat exchange medium 6. As shown in FIG.
In this example, as shown in FIG. 3, the upper plate 1 containing the core 10 is formed flat, and the lower plate 2 is formed like a dish. A pair of pipes 7 are connected to the ends of the lower plate 2 , and a plurality of objects to be cooled 8 are arranged on the upper plate 1 .
The object to be cooled 8 is, for example, an electronic component such as an inverter. This object to be cooled 8 is bonded onto the upper plate 1 using a conductive adhesive or the like after the heat exchanger is completed.

Each plate assembled as in FIGS. 2 and 3 is brazed together in a high temperature furnace to complete the heat exchanger. 3, the heat exchange medium 6 is introduced into the lower plate 2 from one of the pipes 7, and flows in the width direction of the lower plate 2. As shown in FIG. 4 flow in a meandering manner between the bridging portions 3b. Then, the object to be cooled 8 arranged on the upper plate 1 is cooled.
In this example, the slightly crosslinked inner plate 4 is connected to the upper plate 1 and the body to be cooled 8 is arranged on the upper plate 1. Alternatively, the slightly crosslinked inner plate 4 is connected to the lower plate 2, The body to be cooled 8 can also be arranged on the lower plate 2 .

Next, FIG. 4 shows a second embodiment of the plate laminate type heat exchanger of the present invention, which differs from the embodiment of FIG. It is the shape of the plate 2 .
The inner plate 3 and the small-bridge inner plate 4 have a frame portion 9 on the outer periphery in the plane thereof, and a large number of fin portions 3a and bridge portions 3b are formed inside the frame portion 9. As shown in FIG. The upper plate 1 and the lower plate 2 arranged on the uppermost and lowermost stages are formed flat.

Next, FIG. 5 shows a third embodiment of the present invention, in which (A) is a plan view of a plate in which the small fin portion inner plate 5 and the small bridge inner plate 4 are combined, and (B) is the small fin portion. FIG. 2 is a plan view of a core 10 composed of a combination of an inner plate 5 and a slightly bridged inner plate 4 combined with another inner plate 3. FIG.
The plate consisting of the small fin portion inner plate 5 and the small bridge portion inner plate 4 is arranged such that the distance between the fin portions and the distance between the bridge portions are twice as large as those of the conventional inner fins 3 . As a result, the flow resistance is further reduced compared to the other inner fins 3.

Next, in FIG. 6A, adjacent only to the upper plate 1, a plate consisting of a small fin portion inner plate 5 and a small bridge inner plate 4 is arranged. In FIG. 6B, adjacent to the upper plate 1 and the lower plate 2, a plate consisting of a small fin portion inner plate 5 and a small bridge inner plate 4 is arranged.

Next, FIG. 7 is a comparison of the conventional heat exchanger and the heat exchanger shown in FIG. 2(B) of the present invention. and (B) is a comparison of the thermal resistance and pressure loss of both.
The net stick is the conventional one, and the white stick is the main idea.
In FIG. 7A, the flow rate ratio at the uppermost stage in the stacking direction is higher in the present invention than in the conventional one. This increase in the flow rate ratio contributes to improved heat transfer between the upper plate 1 and the fluid.
Further, in FIG. 7B, the conventional one and the present invention have substantially the same thermal resistance, but the pressure loss of the present invention is lower than that of the conventional one. Distribution can be performed smoothly. That is, even if the pressure applied to the heat exchange medium 6 is relatively small, the heat exchange medium 6 can be smoothly circulated.

Therefore, in the heat exchanger of FIG. 2(B), if the body 8 to be cooled is attached to the upper plate 1, the body 8 to be cooled can be effectively cooled.
When the body 8 to be cooled is attached to the lower plate 2 , the slightly bridged inner plate 4 may be arranged adjacent to the lower plate 2 .
Further, as shown in FIG. 5, in the plate having the small fin portion inner plate 5 and the small bridge inner plate 4, the flow rate at the first stage in FIG. 7 is further increased and the pressure loss in FIG. is also lower.

INDUSTRIAL APPLICABILITY The present invention can be used as a plate laminated heat exchanger that is most suitable for cooling small electronic components used in inverters and the like.

1 upper plate 2 lower plate 3 inner plate 3a fin portion 3b bridging portion

4 small bridge inner plate 5 small fin portion inner plate 6 heat exchange medium 7 pipe 8 body to be cooled 9 frame 10 core 11 passage

Claims (1)

An upper plate (1) arranged on one end side in the stacking direction, a lower plate (2) arranged on the other end side, and a plurality of inner plates (3) stacked between both plates, each inner In a plate laminated heat exchanger in which a heat exchange medium flows between plates (3),
The inner plate (3) has a large number of fins (3a) arranged parallel to the flow direction of the heat exchange medium, and a large number of bridges (3b) connecting the fins (3a). The bridging portions (3b) of the inner fins that are integrally arranged and are adjacent to each other in the stacking direction are arranged in mutually different positions in the circulation direction of the heat exchange medium,
At least one of the inner plates (3) forms a slightly cross-linked inner plate (4) having fewer cross-linked portions (3b) than the other inner plates (3 ), and the cross-linked portions (3b) in the slightly cross-linked inner plate (4). The distance between the inner plates (3) is formed to be twice the distance between the bridging portions (3b) of the other inner plates (3) ,
A plate-laminated heat exchanger in which the slightly cross-linked inner plate (4) is positioned in at least one of the uppermost layer on the upper plate (1) side and the lowermost layer on the lower plate (2) side.

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