Laminated plate heat exchanger

Abstract

The present invention suppresses the tendency of flow imbalance between segments in a plate-stacked heat exchanger having an I-shaped inlet / outlet configuration. An inlet (10) for the first fluid (3) is formed at one end of the plates (1, 2) in the stacking direction, and an outlet (11) for the first fluid (3) is formed at the other end of the plates (1, 2). The inlet (10) is connected to the first communication hole (7). A bypass (12) from the second communication hole (8) at the one end to the outlet (11) is formed through the inside or outside of the core (9).

Description

Technical Field

[0001] The present invention relates to a stacked plate heat exchanger, and more particularly to a structure for suppressing flow imbalance (biased flow) in each section of a flow channel through which a fluid flows (circulates). Background Art

[0002] As a conventional type of plate stacking type heat exchanger, there is a heat exchanger in which first flow channels through which a first fluid flows and second flow channels through which a second fluid flows are alternately formed on every other plate in the stacking direction of the plates. Figure 5A and Fig. 6A This is an example of a conventional plate stack type heat exchanger, and the arrangements of the inlet and outlet of the first fluid are different. exist Figure 5A In the heat exchanger, an inlet for the first fluid is arranged at one end in the stacking direction of the plates, and an outlet for the first fluid is arranged at the other end (I-shaped inlet and outlet arrangement). Figure 5B express Figure 5A Flow rate distribution in each section of the first flow channel of the heat exchanger. exist Fig. 6A In the heat exchanger, an inlet and an outlet for a first fluid are arranged at one end portion in the stacking direction of the plates (inlet and outlet arrangement in a U shape). Figure 6B express Fig. 6A Flow rate distribution in each section of the first flow channel of the heat exchanger.

[0003] exist Figure 5A In the case of an I-shaped inlet and outlet configuration, due to the inertia of the fluid, such as Figure 5B As shown in the example, there is a tendency for the flow rate distribution among the stages to be uneven (flow rate imbalance). In addition, Fig. 6A In the case of a U-shaped inlet and outlet configuration, the influence of the flow path length inside the core is dominant, resulting in Figure 6B The example above shows a tendency of traffic imbalance. However, the flow imbalance between the segments is smaller in the U-shaped entrance and exit arrangement than in the I-shaped entrance and exit arrangement. Summary of the invention [Technical problem to be solved by the invention]

[0004] However, depending on the piping conditions, it may be necessary to use Figure 5A The I-shaped entrance and exit configuration is shown.

[0005] Therefore, the technical problem to be solved by the present invention is to suppress the tendency of flow rate imbalance between stages in a plate stack type heat exchanger having an I-shaped inlet and outlet arrangement. [Technical solutions for solving technical problems]

[0006] The first invention for solving the above-mentioned technical problems is a plate stacking type heat exchanger having a core (9) in which a plurality of disk-shaped plates 1 and 2 are stacked. In the stacking direction of the plates 1 and 2, first flow channels 4 through which the first fluid 3 flows and second flow channels 5 through which the second fluid 6 flows are alternately formed on every other plate. A first communicating hole 7 and a second communicating hole 8 are provided separately from each other on each of the plates 1 and 2. The core 9 is used to guide the first fluid 3 from the first communicating hole 7 to the second communicating hole 8 through the first flow channel 4, wherein: An inlet 10 for the first fluid 3 is formed at one end of the plates 1 and 2 in the stacking direction, and an outlet 11 for the first fluid 3 is formed at the other end. The inlet 10 is connected to the first communication hole 7. A bypass 12 from the second communication hole 8 at the one end portion to the outlet 11 is formed through the inside or outside of the core 9 .

[0007] A second invention for solving the above-mentioned technical problems is a plate stack type heat exchanger having a core (9) in which a plurality of disk-shaped plates 1 and 2 are stacked. In the stacking direction of the plates 1 and 2, first flow channels 4 through which the first fluid 3 flows and second flow channels 5 through which the second fluid 6 flows are alternately formed on every other plate. A first communicating hole 7 and a second communicating hole 8 are provided separately from each other on each of the plates 1 and 2. The core 9 is used to guide the first fluid 3 from the second communicating hole 8 to the first communicating hole 7 through the first flow channel 4, wherein: An inlet 10 for the first fluid 3 is formed at one end of the plates 1 and 2 in the stacking direction, and an outlet 11 for the first fluid 3 is formed at the other end. The inlet 10 is connected to the bypass 12, A bypass 12 from the inlet 10 to the second communication hole 8 at the other end is formed through the inside or outside of the core 9. The outlet 11 is connected to the first communication hole 7 .

[0008] Furthermore, a third invention is the plate stack type heat exchanger according to the first invention or the second invention, The first fluid 3 is liquid. [Effects of the invention]

[0009] The above-mentioned first invention is a plate stacked heat exchanger, in which an inlet 10 for the first fluid 3 is formed at one end of each plate 1, 2 in the stacking direction, and an outlet 11 for the first fluid 3 is formed at the other end, the inlet 10 is connected to the first connecting hole 7, and a bypass 12 from the second connecting hole 8 at the one end to the outlet 11 is formed through the inside or outside of the core 9. By having a structure of a bypass 12 from the second connecting hole 8 at one end of the stacking direction of the plates 1 and 2 to the outlet 11, there is essentially the same flow channel as the case where there is an inlet and an outlet at one end in the stacking direction (the case of a U-shaped inlet and outlet configuration), and the flow imbalance tendency is at least partially offset, thereby suppressing the flow imbalance between the stacked flow channels.

[0010] The above-mentioned second invention is a plate stacked heat exchanger, in which an inlet 10 for the first fluid 3 is formed at one end in the stacking direction of the plates 1 and 2, and an outlet 11 for the first fluid 3 is formed at the other end, the inlet 10 is connected to a bypass 12, and the bypass 12 from the inlet 10 to the second connecting hole 8 at the other end is formed through the inside or outside of the core 9, and the outlet 11 is connected to the first connecting hole 7. By having a structure of a bypass 12 having a second connecting hole 8 extending from an inlet 10 to the other end of the plates 1 and 2 in the stacking direction, the same flow channel is essentially provided as in the case of having an inlet and an outlet at one end in the stacking direction (in the case of a U-shaped inlet and outlet configuration), and the flow imbalance tendency is at least partially offset, thereby suppressing the flow imbalance between the stacked flow channels.

[0011] When the first fluid 3 is liquid as described in the third aspect of the present invention, flow rate imbalance in the plate stack type heat exchanger using liquid as a medium can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1A It is a top view of the plate stack type heat exchanger according to the first embodiment of the present invention. Figure 1B yes Figure 1A BB section view. Figure 1C yes Figure 1A Cross-sectional view from the CC direction. Figure 2A It is an explanatory diagram showing the flow state of the first fluid 3 in the core 9 of the plate stack type heat exchanger according to the first embodiment. Figure 2B It is a graph showing the flow channel distribution of each stage in the core 9 of the heat exchanger. Figure 2C It is an explanatory diagram showing the flow state of the first fluid 3 in the core 9 of a conventional plate stack type heat exchanger (I-shaped inlet and outlet arrangement). Figure 2D It is a graph showing the flow channel distribution in each stage in the core 9 of the heat exchanger (conventional type). Figure 3 It is a cross-sectional view showing another example of the first embodiment of the present invention. Figure 4 It is a cross-sectional view showing a plate stack type heat exchanger according to a second embodiment of the present invention. Figure 5A This is a schematic diagram of a conventional first plate stack type heat exchanger in which an inlet 10 and an outlet 11 are separately arranged at the top and bottom of a core 9 . Figure 5B It is a graph showing the flow channel distribution of each stage in the core 9 of the heat exchanger. Fig. 6A This is a schematic diagram of a conventional second plate stack type heat exchanger in which an inlet 10 and an outlet 11 are arranged only on the upper end side of a core 9 . Figure 6B It is a graph showing the flow channel distribution of each stage in the core 9 of the heat exchanger. DETAILED DESCRIPTION

[0013] Next, embodiments of the present invention will be described with reference to the drawings. The common structure of the plate stack type heat exchangers of the first embodiment and the second embodiment is as follows. A plurality of disc-shaped plates 1 and 2 with raised outer edges are stacked to form a core 9. A first flow channel 4 for a first fluid 3 to flow through and a second flow channel 5 for a second fluid 6 to flow through are alternately formed on every other plate in the stacking direction of the plates 1 and 2. A first connecting hole 7 and a second connecting hole 8 are provided separately from each other on each plate 1 and 2. The first connecting hole 7 and the second connecting hole 8 are connected to each section of the first flow channel 4 of the core 9. Heat exchange is performed between the first fluid 3 flowing through the first flow channel 4 and the second fluid 6 flowing through the second flow channel 5 . Furthermore, for example, the first fluid 3 is water, a refrigerant, or the like, and the second fluid 6 is oil or the like. In this example, the plan view shape of each plate 1, 2 is formed into a square (such as Figure 1A As shown, it includes a shape with rounded corners), but the top view shape is not limited to a square, and any shape can be used.

[0014] like Figure 1B , Figure 1C As shown, the first flow channel 4 is hollow, and the inner fin 16 is arranged in the second flow channel 5. When the flow channel is hollow like the first flow channel 4, since its flow resistance is small, it is generally easy to cause flow imbalance between stages. In the first flow channel 4, a protrusion can be formed to improve heat transfer, but in this case, the flow channel resistance is also relatively small, so there is generally a tendency for flow imbalance between stages. When the inner fin 16 is provided in the flow channel like the second flow channel 5 , since the flow resistance thereof is large, the flow rate imbalance between the stages is small.

[0015] In each embodiment, an inlet 10 for the first fluid 3 is formed at one end of the plates 1 and 2 in the stacking direction, and an outlet 11 for the first fluid 3 is formed at the other end (I-shaped inlet and outlet arrangement). At both ends of the stacking direction of plates 1 and 2, Figure 1A , Figure 1B , Figure 1C As described, the cover plate 14 and the bottom plate 15 are arranged. In each embodiment, the inner bypass portion 12a penetrating the plates 1 and 2 is formed on each plate 1 and 2. As an example, the inner bypass 12a is formed by joining the peripheries of holes bored in the plates 1 and 2 at the positions where the inner bypass 12a is formed. Example 1

[0016] In the first embodiment, one end of the plates 1 and 2 in the stacking direction is the end where the cover plate 14 is arranged, and the other end of the plates 1 and 2 in the stacking direction is the end where the bottom plate 15 is arranged. In this example, the inlet 10 is connected to the first communication hole 7 . The bypass 12 composed of the communication passage 13 and the internal bypass 12a leads from the second communication hole 8 at one end in the stacking direction of the plates 1 and 2 to the outlet 11. The communication passage 13 connects the second communication hole 8 at one end in the stacking direction and the internal bypass 12a. like Figure 1B As shown, the outlet 11 of the first fluid 3 is connected to the internal bypass 12a.

[0017] The first fluid 3 flows in from the inlet 10 , flows through the first communication hole 7 in each stage of the first flow channel 4 , and is guided to the second communication hole 8 . Next, the first fluid 3 is guided from the second communication hole 8 to the bypass 12 through the communication passage 13 . Then, the first fluid 3 flows out from the outlet 11 .

[0018] Figure 2A FIG. 2 shows the flow state when the bypass 12 is provided in the core 9 of the plate stack type heat exchanger of the first embodiment. Figure 2B The flow rate distribution of the first fluid 3 in each section of the first flow channel 4 in the first embodiment is shown. Figure 2C As a comparative example compared with the first embodiment, the flow state when the bypass 12 is not provided is shown. Figure 2D The flow rate distribution of the first fluid 3 in each stage of the first flow channel 4 in this comparative example is shown.

[0019] If you compare Figure 2B and Figure 2D ,but Figure 2B Traffic distribution ratio Figure 2D The flow distribution can further suppress the flow imbalance of the first fluid 3 in each section of the first flow channel 4. This is due to the Figure 2A In the structure with bypass 12, the flow channel is substantially Fig. 6A The flow path is the same when the inlet and outlet are arranged in such a U shape. In this example, the heat exchanger having the internal bypass 12 a is illustrated, but the bypass 12 is not limited to the internal bypass 12 a. like Figure 3 As shown in FIG. 1 , the bypass 12 may be formed outside the core 9 by forming an external bypass 12b using a pipe or the like. In this case, the same effects as those of the first embodiment can be obtained. Example 2

[0020] Figure 4 This is the second embodiment of the present invention. This embodiment is different from the first embodiment in that the flow direction of the first fluid 3 is opposite. In the second embodiment, one end of the plates 1 and 2 in the stacking direction is the side where the bottom plate 15 is arranged, and the other end of the plates 1 and 2 in the stacking direction is the side where the cover plate 14 is arranged. Even if the direction of the flow of the first fluid 3 is opposite, the flow channel is substantially the same as Fig. 6A Since the flow paths are the same in the case of such a U-shaped inlet and outlet arrangement, the same effects as those of the first embodiment can be obtained. [Industrial Applicability]

[0021] The present invention can be widely applied to plate stacking type heat exchangers, and is particularly suitable for oil coolers for vehicles. In addition, it can also be applied to battery coolers for electric vehicles, evaporators for air conditioners, and the like. [Explanation of Reference Numerals]

[0022] 1 board 2 boards 3.1st Fluid 41st flow channel 6 Second Fluid 5 Second runner 71st connecting hole 8Second connecting hole

[0023] 9 core 10 Entrance 11 Exit 12 Bypass 12a Internal bypass 12b External bypass 13 Connecting Channels 14 Cover 15 Base Plate 16 Inner fins

Claims

1. A plate stack type heat exchanger comprising a core (9) having a plurality of disk-shaped plates (1, 2) stacked thereon, In the stacking direction of the plates (1, 2), first flow channels (4) for a first fluid (3) to flow through and second flow channels (5) for a second fluid (6) to flow through are alternately formed on every other plate. A first communicating hole (7) and a second communicating hole (8) are provided separately from each other on each plate (1, 2). The core (9) is used to guide the first fluid (3) from the first communicating hole (7) through the first flow channel (4) to the second communicating hole (8). It is characterized in that An inlet (10) for a first fluid (3) is formed at one end of the plates (1, 2) in the stacking direction, and an outlet (11) for the first fluid (3) is formed at the other end. The inlet (10) is connected to the first connecting hole (7). A bypass (12) from the second communication hole (8) at the one end portion to the outlet (11) is formed through the inside or outside of the core (9).

2. A plate stack type heat exchanger comprising a core (9) in which a plurality of disk-shaped plates (1, 2) are stacked, In the stacking direction of the plates (1, 2), first flow channels (4) for a first fluid (3) to flow through and second flow channels (5) for a second fluid (6) to flow through are alternately formed on every other plate. A first communicating hole (7) and a second communicating hole (8) are provided separately from each other on each plate (1, 2). The core (9) is used to guide the first fluid (3) from the second communicating hole (8) through the first flow channel (4) to the first communicating hole (7). It is characterized in that An inlet (10) for a first fluid (3) is formed at one end of the plates (1, 2) in the stacking direction, and an outlet (11) for the first fluid (3) is formed at the other end. The inlet (10) is connected to the bypass (12), A bypass (12) from the inlet (10) to the second communication hole (8) at the other end is formed through the inside or outside of the core (9), The outlet (11) is connected to the first communication hole (7).

3. The plate stack type heat exchanger according to claim 1 or 2, characterized in that: The first fluid (3) is a liquid.

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