A brazed heat exchange plate assembly with an eight-shaped distribution channel

Abstract

The present invention belongs to the technical field of brazed plate heat exchangers, and specifically relates to a brazed heat exchange plate group with an eight-shaped distribution channel, including at least two pairs of unit plate groups, the unit plate group includes a first plate and a second plate arranged in a stacked manner, the first plate and the second plate both include a main panel and a surrounding baffle, the main panel is provided with a plurality of ridges, and valleys are formed between adjacent ridges, the four corners of the main panel are provided with four circular holes, three of which are corner holes and one is a distribution hole, the distribution hole of the first plate is provided with a first eight-shaped groove, and the distribution hole of the second plate is provided with a second eight-shaped groove, the first eight-shaped groove and the second eight-shaped groove cooperate to form an eight-shaped distribution channel, and the channel is narrower near one end of the distribution hole. The eight-shaped distribution channel of the heat exchange plate group is narrower near one end of the distribution hole, ensuring a smaller refrigerant inlet, so that the refrigerant is evenly distributed to each flow channel, but the space of the entire channel becomes larger as it goes inward, so as to avoid blockage of the channel during brazing and improve the yield rate.

Description

Technical Field

[0001] The invention belongs to the technical field of brazed plate heat exchangers, and in particular relates to a brazed heat exchange plate group with an eight-shaped distribution channel. Background Art

[0002] In the refrigeration system, the brazed plate heat exchanger with distributor is commonly used and indispensable as the evaporator. In order to achieve a good heat exchange effect of the evaporator, in addition to the pattern of the heat exchange plate to play a good heat exchange role, the type of distributor and the size of the distribution hole are also very important, which will directly affect the distribution of the refrigerant inside the evaporator, thereby affecting the performance of the heat exchanger.

[0003] In the current evaporator design process, in order to ensure the above-mentioned heat exchange performance, the distribution hole channel is often designed to be relatively small. However, when the channel is small, the evaporator distribution channel is easily blocked uncontrollably when the copper melts during the copper brazing process in the vacuum furnace. Figure 1 As shown, although the existing heat exchange plate ensures a smaller distribution channel (the existing equal-section distribution channel 91), the existing equal-section distribution channel 91 is relatively narrow as a whole. When the product is brazed, the flow resistance of the molten copper foil is relatively large, and congestion is likely to occur during the flow process, causing channel blockage. Once the distribution hole channel in the evaporator is blocked, the heat exchange channel of the evaporator will be blocked. After the heat exchange channel is blocked, it will cause an imbalance in the internal pressure difference of the heat exchanger, thereby causing the heat exchanger to be scrapped. If this problem cannot be effectively solved, not only will the yield rate be unable to be guaranteed, but the performance and service life of the product cannot be effectively guaranteed, resulting in a large degree of product instability. Summary of the invention

[0004] In order to solve the problem that the existing brazed heat exchange plate has a distribution hole channel with a small cross-section, which causes the channel to be easily blocked, thereby resulting in low yield and poor product stability, the present invention discloses a brazed heat exchange plate group with an eight-shaped distribution channel, by arranging a first eight-shaped groove on the distribution hole of the first plate, and arranging a second eight-shaped groove on the distribution hole of the second plate, so that the first eight-shaped groove and the second eight-shaped groove cooperate to form an eight-shaped distribution channel, and the end of the eight-shaped distribution channel close to the distribution hole is a narrower end of the eight-shaped distribution channel, thereby ensuring a smaller refrigerant inlet, but the channel space becomes larger as it goes inward, thereby reducing the flow resistance of molten copper during brazing, avoiding clogging of the distribution channel during brazing, and improving the yield and product stability.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A brazed heat exchange plate group with an eight-shaped distribution channel includes at least two pairs of unit plate groups, each pair of the unit plate groups includes a first plate and a second plate arranged in a stacked manner, the first plate and the second plate both include a main panel and a surrounding baffle, the main panel is provided with a plurality of ridges, and valleys are formed between adjacent ridges, four circular holes are provided at the four corners of the main panel, three of the circular holes are corner holes, and one of the circular holes is a distribution hole, a first eight-shaped groove is provided at the distribution hole of the first plate, and a second eight-shaped groove is provided at the distribution hole of the second plate, the first eight-shaped groove and the second eight-shaped groove cooperate to form an eight-shaped distribution channel, and the end of the eight-shaped distribution channel close to the distribution hole is the narrower end of the eight-shaped shape.

[0007] Preferably, the distribution hole of the above-mentioned first plate is surrounded by a circle of ring plates, and the ring plates are surrounded by a circle of first bosses, the first bosses include a first slope, a first convex surface and a connecting slope, the first slope extends along the edge of the ring plate toward the ridge direction, and is inclined in a direction opposite to the center of the distribution hole, the first convex surface extends outward along the edge of the first slope in the radial direction of the distribution hole, and is connected to the main panel through the connecting slope, and the first figure eight groove is arranged on the ring plate, and is recessed toward the first convex surface.

[0008] Preferably, the ring sheet is flush with the bottom of the valley, and the height of the first boss is equal to the height of the ridge.

[0009] Preferably, the depth of the first figure-eight groove is half the height of the first boss.

[0010] Preferably, the distribution hole of the above-mentioned second plate is surrounded by a circle of second bosses, the second bosses include a second slope and a second convex surface, the second slope extends toward the ridge along the edge of the distribution hole and is inclined toward the center of the distribution hole, the second convex surface extends inward in the radial direction of the distribution hole along the edge of the second slope, and the second figure eight groove is arranged on the second convex surface and is recessed toward the distribution hole.

[0011] Preferably, the height of the second boss is equal to the height of the ridge, and the width of the first convex surface is equal to the width of the second convex surface.

[0012] Preferably, the depth of the second figure-eight groove is half the height of the second boss.

[0013] Preferably, the figure eight-shaped distribution channel is located on one side of the distribution hole close to the adjacent corner hole.

[0014] Preferably, the ridges are arranged in a herringbone pattern from the central axis of the first plate or the second plate to both sides.

[0015] Preferably, the herringbone ridges of the first plate and the herringbone ridges of the second plate are in opposite directions.

[0016] The present invention has the following beneficial effects: the present invention arranges a first figure-eight groove on the distribution hole of the first plate, and arranges a second figure-eight groove on the distribution hole of the second plate, so that the first figure-eight groove and the second figure-eight groove cooperate to form an figure-eight distribution channel, and the end of the figure-eight distribution channel close to the distribution hole is the narrower end of the figure-eight, ensuring a smaller refrigerant inlet, so that the refrigerant has a good flow distribution when entering the flow channel of the heat exchanger, but the space becomes larger as the entire channel goes deeper, thereby reducing the flow resistance of the molten copper during the brazing process, avoiding clogging of the distribution channel during the brazing process, and effectively improving the yield rate and product stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the distribution hole channel structure in the existing brazed heat exchange plate;

[0019] Figure 2 It is a structural schematic diagram of the heat exchange plate group of the present invention;

[0020] Figure 3 yes Figure 2 Enlarged view of part a;

[0021] Figure 4 is a schematic structural diagram of the first plate of the present invention;

[0022] Figure 5 yes Figure 4 Enlarged view of part b;

[0023] Figure 6 is a schematic structural diagram of the second plate of the present invention;

[0024] Figure 7 yes Figure 6 Enlarged view of part c;

[0025] In the figure: 1. first plate; 11. first figure eight groove; 12. ring plate; 13. first boss; 131. first slope; 132. first convex surface; 133. connecting slope; 2. second plate; 21. second figure eight groove; 22. second boss; 221. second slope; 222. second convex surface; 3. baffle; 41. ridge; 42. valley; 43. corner hole; 44. distribution hole; 5. figure eight distribution channel; 8. plate without distribution hole; 91. distribution channel with uniform cross section. DETAILED DESCRIPTION

[0026] The present invention will now be further described in detail with reference to embodiments.

[0027] A brazed heat exchange plate group with an eight-shaped distribution channel includes at least two pairs of unit plate groups, each pair of unit plate groups includes a first plate 1 and a second plate 2 arranged in a stacked manner, the first plate 1 and the second plate 2 both include a main panel and a surrounding baffle 3, a plurality of ridges 41 are provided on the main panel, valleys 42 are formed between adjacent ridges 41, four circular holes are provided at the four corners of the main panel, and the characteristics are: three circular holes are corner holes 43, one circular hole is a distribution hole 44, a first eight-shaped groove 11 is provided at the distribution hole 44 of the first plate 1, a second eight-shaped groove 21 is provided at the distribution hole 44 of the second plate 2, the first eight-shaped groove 11 and the second eight-shaped groove 21 cooperate to form an eight-shaped distribution channel 5, and the end of the eight-shaped distribution channel 5 close to the distribution hole 44 is the narrower end of the eight-shaped shape.

[0028] The first figure eight groove 11 and the second figure eight groove 21 form an figure eight distribution channel 5. The end of the figure eight distribution channel 5 close to the distribution hole 44 is the narrower end of the figure eight, ensuring a smaller refrigerant inlet so that the refrigerant can be evenly distributed to each flow channel. However, the further inward the entire distribution channel is, the larger the space becomes, which reduces the flow resistance of the molten copper during the brazing process, allowing the molten copper to smoothly pass through the figure eight distribution channel 5, avoiding blockage of the distribution channel during the brazing process, and effectively improving the yield rate and product stability.

[0029] like Figure 2-3 As shown, in a general heat exchanger, there is one more water flow channel than refrigerant flow channel, so when the heat exchange plates are assembled into a heat exchanger, the two outermost heat exchange plates are both plates 8 without distribution holes.

[0030] In a specific embodiment, Figure 4-5 As shown, the distribution hole 44 of the first plate 1 is surrounded by a circle of ring sheets 12, and the ring sheets 12 are surrounded by a circle of first bosses 13. The first bosses 13 include a first slope 131, a first convex surface 132 and a connecting slope 133. The first slope 131 extends along the edge of the ring sheet 12 toward the ridge 41 and is inclined in a direction opposite to the center of the distribution hole 44. The first convex surface 132 extends outward along the edge of the first slope 131 in the radial direction of the distribution hole 44 and is connected to the main panel through the connecting slope 133. The first figure eight groove 11 is set on the ring sheet 12 and is recessed toward the first convex surface 132.

[0031] In a specific embodiment, Figure 4-5 As shown, the ring sheet 12 is flush with the bottom of the valley 42 , and the height of the first boss 13 is equal to the height of the ridge 41 .

[0032] In a specific embodiment, Figure 4-5As shown, the depth of the first figure eight groove 11 is half the height of the first boss 13. In a specific embodiment, the depth of the first figure eight groove 11 can be adjusted according to specific flow requirements.

[0033] In a specific embodiment, Figure 6-7 As shown, a circle of second bosses 22 is provided around the distribution hole 44 of the second plate 2, and the second bosses 22 include a second slope 221 and a second convex surface 222. The second slope 221 extends along the edge of the distribution hole 44 toward the ridge 41 and is inclined toward the center of the distribution hole 44. The second convex surface 222 extends inward in the radial direction of the distribution hole 44 along the edge of the second slope 221. The second figure eight groove 21 is arranged on the second convex surface 222 and is recessed toward the distribution hole 44.

[0034] In a specific embodiment, Figure 6-7 As shown, the height of the second boss 22 is equal to the height of the ridge 41 , and the width of the first convex surface 132 is equal to the width of the second convex surface 222 .

[0035] In a specific embodiment, Figure 6-7 As shown, the depth of the second figure-eight groove 21 is half the height of the second boss 22. In a specific embodiment, the depth of the second figure-eight groove 21 can be adjusted according to specific flow requirements.

[0036] In a specific embodiment, Figure 6-7 As shown, the figure eight distribution channel 5 is located on one side of the distribution hole 44 close to the corner hole 43 adjacent thereto.

[0037] In a specific embodiment, Figure 6-7 As shown, the ridges 41 are arranged in a herringbone shape from the central axis of the first plate 1 or the second plate 2 to both sides.

[0038] In a specific embodiment, Figure 6-7 As shown, the herringbone ridges 41 of the first plate 1 and the herringbone ridges 41 of the second plate 2 are in opposite directions.

[0039] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A brazed heat exchange plate assembly with an eight-shaped distribution channel, comprising at least two pairs of unit plate assemblies, each pair of the unit plate assemblies comprising a first plate (1) and a second plate (2) which are stacked, the first plate (1) and the second plate (2) both comprising a main panel and a surrounding baffle (3), the main panel being provided with a plurality of ridges (41), valleys (42) being formed between adjacent ridges (41), and four circular holes being provided at four corners of the main panel, characterized in that: Three of the circular holes are corner holes (43), one of the circular holes is a distribution hole (44), a first figure eight-shaped groove (11) is provided at the distribution hole (44) of the first plate (1), a second figure eight-shaped groove (21) is provided at the distribution hole (44) of the second plate (2), the first figure eight-shaped groove (11) and the second figure eight-shaped groove (21) cooperate to form a figure eight-shaped distribution channel (5), and an end of the figure eight-shaped distribution channel (5) close to the distribution hole (44) is a narrower end of the figure eight; The distribution hole (44) of the first plate (1) is surrounded by a ring sheet (12), and the ring sheet (12) is surrounded by a first boss (13), the first boss (13) comprising a first slope (131), a first convex surface (132) and a connecting slope (133), the first slope (131) extending along the edge of the ring sheet (12) in the direction of the ridge (41) and inclined in a direction opposite to the center of the distribution hole (44), the first convex surface (132) extending outwards in the radial direction of the distribution hole (44) along the edge of the first slope (131), and connected to the main panel via the connecting slope (133), the first figure eight groove (11) being arranged on the ring sheet (12) and being recessed in the direction of the first convex surface (132); The ring sheet (12) is flush with the bottom of the valley (42), and the height of the first boss (13) is equal to the height of the ridge (41); The depth of the first figure eight-shaped groove (11) is half the height of the first boss (13); The distribution hole (44) of the second plate (2) is surrounded by a circle of second bosses (22), the second bosses (22) comprising a second slope (221) and a second convex surface (222), the second slope (221) extending along the edge of the distribution hole (44) in the direction of the ridge (41) and inclined in the direction of the center of the distribution hole (44), the second convex surface (222) extending inwards in the radial direction of the distribution hole (44) along the edge of the second slope (221), and the second figure eight groove (21) being arranged on the second convex surface (222) and being recessed in the direction of the distribution hole (44); The height of the second boss (22) is equal to the height of the ridge (41), and the width of the first convex surface (132) is equal to the width of the second convex surface (222); The depth of the second figure eight-shaped groove (21) is half the height of the second boss (22).

2. The brazed heat exchange plate assembly with an eight-shaped distribution channel according to claim 1, characterized in that: The figure eight distribution channel (5) is located on one side of the distribution hole (44) close to the adjacent corner hole (43).

3. The brazed heat exchange plate assembly with an eight-shaped distribution channel according to claim 1, characterized in that: The ridges (41) are arranged in a herringbone pattern from the central axis of the first plate (1) or the second plate (2) to both sides.

4. The brazed heat exchange plate assembly with an eight-shaped distribution channel according to claim 3, characterized in that: The herringbone ridges (41) of the first plate (1) and the herringbone ridges (41) of the second plate (2) are in opposite directions.

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