Box-type laminated heat exchanger capable of enabling heat exchange medium to smoothly flow into bottom corner holes

Abstract

The utility model relates to a box-type laminated heat exchanger capable of enabling heat exchange media to smoothly flow into bottom corner holes, which is formed by sequentially laminating a plurality of box-type heat exchange plates with inclined planes on the peripheries, and the inclined planes which are tightly attached together form external brazing sealing of heat exchange flow layers of dividing walls. In each flow layer formed by the box-type heat exchange plates, the box-type heat exchange plates of the flow layer with the heat exchange medium flowing from top to bottom are lengthened box-type heat exchange plates, the length of the peripheral extension plane of the lower corner hole of each lengthened box-type heat exchange plate is lengthened, and the positions of the two lower corner holes are distributed in an up-down staggered mode. According to the lengthened base plate structure correspondingly placed on the extending plane around the corner holes in the lower portion of the lengthened box type heat exchange plate, the relative positions of all through holes of the lengthened base plate structure comprise the relative positions of the open type half holes, and the relative positions correspond to the positions of the corner holes distributed in an up-and-down staggered mode. The shape of the box-shaped heat exchange plate and the shape of the base plate are beneficial for heat exchange media to smoothly flow into the corner holes in the lower portion of the box-shaped heat exchange plate.

Description

Technical Field

[0001] The utility model relates to a heat exchange structure, and more particularly to a box-type stacked heat exchanger that allows the heat exchange medium to flow smoothly into the bottom corner hole. Background Technology

[0002] The box-type stacked heat exchanger, which allows the heat exchange medium to flow smoothly into the bottom corner holes, is composed of multiple box-shaped heat exchange plates with beveled edges stacked together in sequence. These closely attached beveled edges form the external brazed seal of each heat exchange flow layer. Each box-type heat exchange plate has a heat exchange structure in the middle for heat exchange between the plates, and each box-type heat exchange plate has corner holes at both ends for the heat exchange medium to flow through. There are pad structures on the extended planes around the corner holes at both ends of each box-type heat exchange plate. Through the various corner holes on the box-type heat exchange plates and through the pad structures, the box-type stacked heat exchanger forms various heat exchange medium heat exchange modes with separate walls.

[0003] The prior art of a box-type stacked heat exchanger that allows the heat exchange medium to flow smoothly into the bottom corner holes has been disclosed in utility model patent number "ZL 2021227212201" and other patents. In Figure 9 of the "Description Drawings" of this utility model patent, it is clearly shown that the inlet gasket structures 26, 26a on the refrigerant side have through holes 25, 25a, and small upward flow channels are opened in the through holes 25, 25a. These small flow channels can act as liquid phase equalizers before the refrigerant evaporation heat exchange medium enters the heat exchange structure. The flow direction of the refrigerant evaporation heat exchange medium is from bottom to top, while in the partition heat exchange flow layer of the partition heat exchange, the partition heat exchange medium flows from top to bottom. As can be seen in Figure 9, the heat exchange medium flows downward into the heat exchange structure from the corner hole at the top of the box-shaped heat exchange plate 4e through the open half-hole in the pad 3n, and flows diagonally to the open half-hole of the pad 3p and the corner hole at the bottom of the box-shaped heat exchange plate 4e. The pad 3p has a flat shape in the direction facing the heat exchange structure. This makes it easy for the downward flowing heat exchange medium to swirl, stagnate and accumulate on the outside of the flat shape of the pad and in the right-angle corners in contact with the heat exchange structure. When this box-type stacked heat exchanger is used as a refrigeration evaporator, especially when the heat exchange medium in the partition heat exchange layer contains water, this water-containing partition heat exchange medium is easily vortexed, trapped, and accumulated in the right-angle corners by the action of the refrigerant evaporation heat exchange medium in the partition heat exchange. The volume of this ice block will gradually increase during the continuous flow of water, eventually forming ice expansion. This ice expansion will seriously damage the product's seal, directly leading to leakage of the heat exchange medium and scrapping of the box-type stacked heat exchanger. Summary of the Invention

[0004] The main purpose of this utility model is to place pad structures in the extended plane around the corner holes at both ends of each box-type heat exchange plate. The shape of these pad structures, especially the direction towards the heat exchange structure, should help prevent the various heat exchange media from swirling, stagnating, and accumulating, and also facilitate the comprehensive and smooth flow of various heat exchange media into and out of each corner hole.

[0005] The purpose of this utility model is achieved by the following scheme: a box-type stacked heat exchanger that allows the heat exchange medium to flow smoothly into the bottom corner holes is composed of multiple box-shaped heat exchange plates with beveled edges stacked sequentially. These closely attached beveled edges form the external brazed seal of each heat exchange flow layer. Each box-type heat exchange plate has a heat exchange structure in the middle for inter-wall heat exchange, and each box-type heat exchange plate has corner holes at both ends for the heat exchange medium to flow through. The extended planes around the corner holes at both ends of each box-type heat exchange plate also have… The heat exchanger has a pad structure, which, through various corner holes on the box-shaped heat exchange plates and through the pad structure, enables the box-shaped stacked heat exchanger to form a heat exchange mode with various heat exchange media in a partitioned manner. The feature is that, in each flow layer formed by each box-shaped heat exchange plate, for each flow layer where the heat exchange medium flows from top to bottom, the pad structure placed on the extended plane around the corner holes at the bottom of these flow layers, in the direction facing the heat exchange structure, the shape of the pad structure helps various heat exchange media to flow smoothly into the corner holes at the bottom of each box-shaped heat exchange plate.

[0006] In each flow layer composed of various box-type heat exchange plates, for each flow layer where the heat exchange medium flows from top to bottom, the pad structure placed on the extended plane around the corner hole at the bottom of these flow layers has an external shape that slopes upward from the edge of the open semi-hole in the direction facing the heat exchange structure, and in the pad structure that slopes upward, there is a through hole for the closed flow of a certain heat exchange medium.

[0007] In each flow layer composed of various box-type heat exchange plates, for each flow layer where the heat exchange medium flows from top to bottom, the pad structure placed on the extended plane around the corner hole at the bottom of these flow layers has an external shape that bulges upward from the edge of the open semi-hole in the direction facing the heat exchange structure. In the pad structure that bulges upward from the edge of the open semi-hole, there is a through hole for the closed flow of a certain heat exchange medium.

[0008] The positions of the two corner holes at the bottom of each extended box-type heat exchange plate are obviously staggered vertically. Correspondingly, the relative positions of all the through holes in the extended pad structure placed at the bottom of these extended box-type heat exchange plates, including the relative positions of the open half holes, are also obviously staggered vertically, and all correspond to the positions of the two obviously staggered corner holes at the bottom of the extended box-type heat exchange plate.

[0009] In each flow layer composed of extended box-shaped heat exchange plates, where the heat exchange medium flows from top to bottom, the extended pad structure placed on the extended plane around the corner hole at the bottom of these flow layers has an external shape that slopes upward from the edge of the open semi-hole in the direction facing the heat exchange structure. In the extended pad structure that slopes upward, there is a through hole for the closed flow of a certain heat exchange medium.

[0010] In each flow layer composed of extended box-shaped heat exchange plates, where the heat exchange medium flows from top to bottom, the extended pad structure placed on the extended plane around the corner hole at the bottom of these flow layers has an external shape that curves upward from the edge of the open semi-hole. In the extended pad structure with its curve curve concave upward, there is a through hole for the closed flow of a certain heat exchange medium.

[0011] Various pad structures, including elongated pad structures, are placed on the extended plane around the corner holes at both ends of each box-type heat exchange plate. Any form, shape, size, and number of lightening hole structures can be placed at any position in these pad structures.

[0012] This utility model has the following advantages and positive effects:

[0013] In a box-type stacked heat exchanger that allows the heat exchange medium to flow smoothly into the bottom corner holes, in each flow layer formed by the box-type heat exchange plates, where the heat exchange medium flows from top to bottom, a pad structure placed on the extended plane around the bottom corner holes of these flow layers, in the direction facing the heat exchange structure, the shape of the pad structure helps various heat exchange media to flow smoothly into the bottom corner holes of each box-type heat exchange plate, thereby preventing and eliminating the formation of ice blockage and ice expansion in the heat exchange medium.

[0014] Various pad structures, including elongated pad structures, are placed on the extended plane around the corner holes at both ends of each box-type heat exchange plate. At any position in these pad structures, there can be any form, shape, size, and number of weight-reducing hole structures, thereby significantly reducing the weight of the product. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 Schematic diagram of the heat exchange medium flowing from bottom to top inside the box-shaped heat exchange plate and the assembly of various structural components.

[0017] Figure 2 Schematic diagram of the heat exchange medium flowing from top to bottom inside the box-shaped heat exchange plate and the assembly of various structural components.

[0018] Figure 3Box-shaped heat exchange plates with various flow directions are assembled sequentially and at intervals to form a partitioned heat exchange mode, and a schematic diagram of the assembly of each structural component is shown.

[0019] Figure 4 The heat exchange medium flows from bottom to top. The positions of the corner holes at the bottom of the elongated box-shaped heat exchange plates and the positions of the through holes in the elongated gasket structure are clearly staggered vertically.

[0020] Figure 5 The heat exchange medium flows from top to bottom. The positions of the corner holes at the bottom of the elongated box-shaped heat exchange plates, as well as the positions of the through holes and open semi-holes in the elongated pad structure, are clearly staggered vertically. Furthermore, the cross-sectional area of ​​the flow channel continuously decreases in the lower flow guiding structure.

[0021] Figure 6 The heat exchange medium flows from top to bottom. The through holes and open semi-open holes in the elongated gasket structure are clearly staggered vertically, and the cross-sectional area of ​​the flow channels in the lower guide structure varies as shown in the schematic diagram.

[0022] Figure 7 The heat exchange medium flows from top to bottom. The through-holes and open semi-open holes in the elongated gasket structure are staggered vertically, and the through-holes have small flow channels. Detailed Implementation

[0023] The following description, in conjunction with embodiments and illustrations, provides further details:

[0024] In all the illustrations, labels 1, 1a, 1b, 1c, 1d, and 1e represent open semi-perforated structures in each pad structure. Specifically, label 1 is located above corner hole 12, label 1a is above corner hole 15, label 1b is below corner hole 20, label 1d is below corner hole 20a, and label 1e is below corner hole 20b. Labels 2, 2a, 2b, 2c, 2d, and 2e represent various lightening holes in each pad structure. Label 3 represents the pad structure above the box-type heat exchange plate 10. Labels 4, 4a, and 4b represent the closed-loop flow holes for heat exchange medium A in pad structures 3, 9, and 23. Labels 5 and 5a represent the heat exchange structure for heat exchange medium B flowing from bottom to top. Labels 6 and 6a represent the flow direction of heat exchange medium B from bottom to top. Label 7 represents the structure above through hole 8 in pad structure 9. The term "narrow flow channel" is defined by the designation 7a, which indicates a narrow flow channel located above the through-hole 8a in the pad structure 23. Designations 8 and 8a both indicate the inlet flow channel through-holes of the heat exchange medium B entering the heat exchange structures 5 and 5a through the narrow flow channels 7 and 7a. Designation 9 indicates the location of the inlet flow channel through-hole 8 of the heat exchange medium B in the lower part of the box-type heat exchange plate 10, including the location of the closed flow through-hole 4a of the partition heat exchange medium A in the pad structure 9. Compared to the pad structure 23, this is essentially a relatively horizontal pad structure. Designations 10, 10a, and 10b all indicate box-type heat exchange plates. In this designation, 10 indicates that the heat exchange medium B flows from bottom to top in a box-shaped heat exchange plate; 10a and 10b both indicate that the heat exchange medium A in the partition heat exchange is flowing from top to bottom in a box-shaped heat exchange plate; 11 indicates the flow guide structure located below the pad structure 3; 12 indicates that after the heat exchange medium B flows from bottom to top through the heat exchange structure 5, it passes through the flow guide structure 11 and flows into the corner hole at the top of the box-shaped heat exchange plate 10; 13 indicates the closed-loop through-hole for the heat exchange medium B in the pad structure 14, and the position of this through-hole 13 is relative to the corner hole at the top of the box-shaped heat exchange plate 10. The position of hole 12 corresponds to the position of the plate; Identifier 14 indicates the pad structure located on the upper part of the box-type heat exchange plate 10a; Identifier 15 indicates the corner hole located on the upper part of the box-type heat exchange plate 10a before the heat exchange medium A flows into the heat exchange structure 22; Identifier 16 indicates the flow guide structure located on the lower part of the pad structure 14; Identifiers 17, 17a, and 17b all indicate the flow direction of the heat exchange medium A from top to bottom; Identifier 18 indicates the closed flow through hole of the heat exchange medium B in the pad structure 19; Identifier 18a indicates the closed flow through hole of the heat exchange medium B in the pad structure 19a;Identification 19 indicates the lower part of the box-type heat exchange plate 10a, whose shape slopes upward from the edge of the open semi-hole 1b. This upward slope allows the through-hole 18 for the closed flow of a heat exchange medium to be sealed within the plate. Identification 19a indicates the lower part of the box-type heat exchange plate 10b, whose shape protrudes upward from the edge of the open semi-hole 1c. This upward convex slope allows the through-hole 18a for the closed flow of a heat exchange medium to be sealed within the plate. Additionally, Identifications 19 and 19a also indicate the lower parts of the box-type heat exchange plates 10a and 10b. The locations of the through holes 18 and 18a for the heat exchange medium B, including the locations of the open semi-holes 1b and 1c, are basically horizontal compared to the pad structure 26; Identifiers 20, 20a, and 20b all indicate that after the heat exchange medium A flows through the heat exchange structures 22, 22a, and 22b, it flows into the corner holes at the bottom of the box-type heat exchange plates 10a, 24a, and 24b; Identifier 21 indicates the flow guiding structure located above the pad structure 19; Identifiers 22 and 22a both indicate the heat exchange structure where the heat exchange medium A flows from top to bottom; Identifier 23 indicates the heat exchange in the lower part of the extended box-type heat exchange plate 24. The inlet channel 8a of medium B and the closed flow passage 4b ​​of the partition heat exchange medium A are located in the pad structure 23, corresponding to the positions of the two corner holes at the bottom of the box-type heat exchange plate 24. This is also a clearly staggered pad structure. Labels 24, 24a, and 24b all indicate elongated box-type heat exchange plates. The two corner holes at the bottom of these elongated box-type heat exchange plates are clearly staggered. Label 24 indicates an elongated box-type heat exchange plate where heat exchange medium B flows from bottom to top, while labels 24a and 24b indicate an elongated box-type heat exchange plate where partition heat exchange medium A flows from top to bottom. Heat exchange plates; markings 25 and 25a indicate closed-loop through-holes for heat exchange medium B within pad structures 26 and 26a; markings 26 and 26a indicate that the positions of the closed-loop through-holes 25 and 25a for heat exchange medium B within pad structures 26 and 26a, located below the elongated box-type heat exchange plates 24a and 24ba, correspond to the positions of the two corner holes at the bottom of the box-type heat exchange plates 24a and 24b, respectively, representing a clearly staggered pad structure; markings 27 and 27a indicate the flow guiding structure located below heat exchange structures 22a and 22b.

[0025] exist Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 5 , Figure 6 , Figure 7 In the middle, although in Figure 4 , Figure 5 , Figure 6 and Figure 7The pad structures 23, 26, and 26a do not show the relief hole structure. However, the designations 2, 2a, 2b, 2c, 2d, and 2e all indicate that in any position of these pad structures 3, 14, 9, 19, 19a, 23, 26, and 26a, any form, shape, size, and number of relief hole structures are allowed, provided that they do not impede the closed flow of each through hole in these pad structures and the smooth flow of each heat exchange medium into and out of the corner holes of each box-type heat exchange plate.

[0026] exist Figure 4 , 5 In all the pad structures of 6 and 7, especially in the extended pad structures 23, 26 and 26a, the various lightening hole structures that should be present are not shown for the sake of drawing simplicity.

[0027] exist Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 5 , Figure 6 , Figure 7 In the diagram, all the pad structures, including those marked 3, 9, 14, 19, 19a, 23, 26, and 26a, especially the open semi-hole markings 1, 1a, 1b, 1c, 1d, and 1e, indicate that there are different types of pad structures in the extended plane around the corner holes at both ends of each box-type heat exchange plate. These pad structures ensure that the entire box-type stacked heat exchanger will not deform or warp during the brazing process, under the high temperature of brazing and the pressure of the brazing fixture and counterweight, thus ensuring that the product has a straight shape and qualified appearance dimensions.

[0028] exist Figure 3 It shows Figure 1 and Figure 2 Alternating assembly of sections forms a partitioned heat exchange mode.

[0029] exist Figure 2 In the pad structure 19, the heat exchange medium flows from top to bottom in the flow layer. The pad structure 19 is placed on the extended plane around the corner hole at the bottom of the box-shaped heat exchange plate 10a. In the direction facing the heat exchange structure, its shape is inclined upward from the edge 1b of the open half hole. In the pad structure 19 with its inclined upward, there is a through hole 18 for the closed flow of a certain heat exchange medium.

[0030] exist Figure 3In the pad structure 19a, the heat exchange medium flows from top to bottom in the flow layer. The pad structure 19a is placed on the extended plane around the corner hole at the bottom of the box-shaped heat exchange plate. In the direction facing the heat exchange structure, its shape is raised upward from the edge 1c of the open semi-hole in an oblique arc. In the pad structure 19a with its oblique arc raised upward, there is a through hole 18a for the closed flow of a certain heat exchange medium.

[0031] exist Figure 4 , Figure 5 , Figure 6 In the case of the extended box-type heat exchange plates 24, 24a, and 24b, the positions of the two corner holes at the bottom are obviously staggered vertically. Correspondingly, in the extended pad structures 23, 26, and 26a placed at the bottom of these extended box-type heat exchange plates, the relative positions of all the through holes, including the relative positions of the open half holes, are also obviously staggered vertically, and all correspond to the positions of the two obviously staggered corner holes at the bottom of the extended box-type heat exchange plates.

[0032] Figure 7 A schematic diagram showing that the extended box-type heat exchange plate has small flow channels on its sealed through holes.

[0033] exist Figure 5 , Figure 6 In this process, it can be assumed that the refrigerant evaporation heat exchange medium flows through the closed flow holes 25 and 25a in the extended pad structure 26 and 26a, into the through hole 8a in the extended pad structure 23, and then flows into the heat exchange structure 5a through the small flow channel 7a on the through hole 8a. After passing through the heat exchange structure 5a, it gradually evaporates and absorbs heat to become gaseous.

[0034] It is known that when the initially liquid refrigerant evaporating heat exchange medium first enters the box-type stacked heat exchanger and is still flowing in the closed flow holes 25, 25a and through holes 8a in the extended pad structures 26, 26a, and in the initial stage when it overflows upward through the narrow flow channel 7a and flows into the heat exchange structure 5a, it has the strongest evaporative heat absorption energy. At this stage, ice blockage is most likely to occur in the partition heat exchange medium A in the wall heat exchange. In the stacked assembly structure, such extended heat exchange plates 24, 24b and... The elongated pad structures 23 and 26a allow the heat exchange medium in the partition heat exchanger to flow smoothly and quickly through the lower part of the heat exchange structure 22b and the flow guide structure 27a, away from the closed flow passage 25a and the through hole 8a. Even if the heat exchange medium in the partition heat exchanger contains water, and even if this water-containing heat exchange medium may remain in the lower part of the flow guide structure 27a and the corner hole 20b, ice blockage and ice expansion can be avoided in the lower part of the flow guide structure 27a and the corner hole 20b.

[0035] In fluid mechanics, it is known that in structures with the same flow rate but different cross-sectional areas in different parts of the flow channel, the fluid will experience increased local pressure and velocity as it flows through the smaller cross-sectional area. Figure 5 The lower extended pad structure 26 and Figure 6 Compared to the lower elongated pad structure 26a, it can be found that... Figure 5 The lower elongated pad structure 26 and its flow guiding structure 27, with their continuously decreasing cross-sectional area, cause the fluid velocity within them to continuously accelerate. And... Figure 6 In the lower elongated pad structure 26a, there are structures with different flow velocities in the lower flow guiding structure 27a. Figure 6 The lower elongated pad structure 26a allows the heat exchange medium A to pass through the flow guiding structure 27a. When the heat exchange medium A flows through the relatively narrow flow channel of the flow guiding structure 27a, the flow velocity will be locally accelerated and the fluid pressure will be locally increased. Subsequently, the flow velocity will be slowed down and the fluid pressure will be reduced. This phenomenon is intended to interfere with any vortices and trapped substances that may exist in the heat exchange medium A and avoid local blockage.

Claims

1. A box-type stacked heat exchanger that allows the heat exchange medium to flow smoothly into the bottom corner holes is composed of multiple box-shaped heat exchange plates with beveled edges stacked sequentially. These closely attached beveled edges form the external brazed seal of each heat exchange flow layer. Each box-shaped heat exchange plate has a heat exchange structure in the middle for indirect heat exchange, and each box-shaped heat exchange plate has corner holes at both ends for the heat exchange medium to flow through. Each box-shaped heat exchange plate has a gasket structure on the extended plane around the corner holes at both ends. Through the corner holes on the box-shaped heat exchange plates and through the gasket structures, the box-type stacked heat exchanger forms multiple indirect heat exchange modes for the heat exchange medium. Its characteristic is that... In each flow layer composed of various box-type heat exchange plates, the box-type heat exchange plates in which the heat exchange medium flows from top to bottom are elongated box-type heat exchange plates. The length of the extended plane around the lower corner holes of the elongated box-type heat exchange plates is increased, and the positions of the two lower corner holes are staggered vertically. Correspondingly, the elongated pad structure placed on the extended plane around the lower corner holes of these elongated box-type heat exchange plates has all its through holes in a staggered vertically, including the relative positions of the open half holes, which are also staggered vertically and correspond to the positions of the two staggered corner holes at the bottom of the elongated box-type heat exchange plates.

2. The novel box-type stacked heat exchanger according to claim 1, characterized in that, The extended pad structure slopes upwards from the edge of the open semi-hole, and has a closed through hole for the flow of a heat exchange medium within the pad structure.

3. The novel box-type stacked heat exchanger according to claim 1, characterized in that, The extended pad structure is an upward-protruding, sloping arc surface from the edge of the open semi-hole, and there is a closed through hole for the heat exchange medium to flow through in the pad structure.

4. The novel box-type stacked heat exchanger according to claim 1, characterized in that, The extended pad structure is concave upward from the edge of the open semi-hole with an inclined arc surface, and there is a through hole in the extended pad structure for the closed flow of a heat exchange medium.

5. The novel box-type stacked heat exchanger according to claim 1, characterized in that, The pad structure, including the elongated pad structure, is placed on the extended plane around the corner holes at both ends of each box-type heat exchange plate, and these pad structures have a lightening hole structure.

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