CN110779361A - A brazed heat exchange plate group with a figure-eight distribution channel - Google Patents

Abstract

The invention belongs to the technical field of brazed plate heat exchangers, and in particular relates to a brazed heat exchange plate group with a figure-eight distribution channel, comprising at least two pairs of unit plate groups, and the unit plate group includes first plates arranged in layers Sheet and second sheet, both the first sheet and the second sheet include a main panel and surrounding baffles, the main panel is provided with several ridges, and valleys are formed between adjacent ridges, and the four corners of the main panel are provided with Four round holes, three are corner holes, one is a distribution hole, the distribution hole of the first plate is provided with a first figure-eight groove, the distribution hole of the second plate is provided with a second figure-eight groove, the first The figure-eight groove cooperates with the second figure-eight groove to form a figure-eight distribution channel, and one end of the channel close to the distribution hole is narrower. The figure-eight distribution channel of the heat exchange plate group is narrower at one end near the distribution hole to ensure a small refrigerant inlet, so that the refrigerant is evenly distributed to each flow channel, but the further the channel is, the larger the space is to avoid the occurrence of the channel during brazing. Blocking, improve the yield rate.

Description

A brazed heat exchange plate group with a figure-eight distribution channel

technical field

The invention belongs to the technical field of brazed plate heat exchangers, in particular to a brazed heat exchange plate group with a figure-eight distribution channel.

Background technique

In refrigeration systems, brazed plate heat exchangers with distributors are commonly used and essential as evaporators. In order to have a good heat exchange effect of the evaporator, in addition to the good heat exchange effect of the pattern shape of the heat exchange plate, the type of the distributor and the size of the distribution hole are also very important, which will directly affect the cooling medium. The distribution inside the evaporator affects the performance of the heat exchanger.

In the design process of the current evaporator, in order to ensure the above-mentioned heat exchange performance, the channels of the distribution holes are often designed to be relatively small, but after the channels are small, during the copper brazing process of the evaporator in the vacuum furnace, the copper melts very quickly. It is easy to cause uncontrollable blockage of the distribution channel of the evaporator. As shown in FIG. 1 , although the existing heat exchange plate ensures a small distribution channel (the existing equal-section distribution channel 91 ), the existing equal-section distribution channel 91 is relatively narrow as a whole, and the product is brazed when the product is brazed. , the flow resistance of the molten copper foil is large, and it is prone to congestion during the flow process, resulting in 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, the pressure difference inside the heat exchanger will be unbalanced, which will lead to the scrapping of the heat exchanger. If this problem cannot be effectively solved, not only the yield cannot be guaranteed, but also the performance and service life of the product cannot be effectively guaranteed, resulting in a large degree of product instability.

SUMMARY OF THE INVENTION

In order to solve the problems that the existing brazed heat exchange plates are easy to block in order to ensure a small cross-section of the distribution hole channel, resulting in low yield and poor product stability, the invention discloses a brazing device with a figure-eight distribution channel. For welding the heat exchange plate group, the first figure-eight groove is arranged on the distribution hole of the first plate, and the second figure-eight groove is arranged on the distribution hole of the second plate, so that the first figure-eight groove is formed. It cooperates with the second figure-eight groove to form a figure-eight distribution channel. The end of the figure-eight distribution channel close to the distribution hole is the narrower end of the figure-eight shape, which ensures a smaller refrigerant inlet, but the further inward the channel space is larger, reducing the amount of brazing. The flow resistance of molten copper during the process can avoid clogging of the distribution channel during the brazing process, and improve the yield and product stability.

In order to achieve the above object, the present invention adopts the following technical solutions:

A brazed heat exchange plate group with a figure-eight distribution channel, comprising at least two pairs of unit plate groups, each pair of the unit plate groups including a first plate and a second plate arranged in layers, the first plate group Both the first plate and the second plate include a main panel and surrounding baffles. The main panel is provided with a number of ridges, and valleys are formed between adjacent ridges, and four corners of the main panel are provided with four Round holes, three of the round holes are corner holes, one of the round holes is a distribution hole, the distribution hole of the first plate is provided with a first figure-eight groove, and the distribution hole of the second plate is There is a second figure-eight groove at the place, and the first figure-eight groove and the second figure-eight groove cooperate to form a 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. .

Preferably, there is a ring of ring pieces around the distribution hole of the first plate, and a circle of first bosses around the ring piece, and 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 piece in the direction of the ridge and slopes in a direction opposite to the center of the dispensing hole, and the first convex surface extends outward along the edge of the first slope in the radial direction of the dispensing hole , and is connected with the main panel through the connecting slope, and the first figure-eight groove is arranged on the ring piece and is recessed in the direction of the first convex surface.

Preferably, the ring piece is flush with the bottom of the valley, and the height of the first boss is equal to the height of the ridge.

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

Preferably, there is a circle of second bosses around the distribution hole of the second plate, the second boss includes a second slope and a second convex surface, and the second slope extends along the edge of the distribution hole toward the ridge. , and is inclined toward the center of the distribution hole, the second convex surface extends inward along the edge of the second slope in the radial direction of the distribution hole, and the second figure-eight groove is provided on the second convex surface, facing the The distribution hole direction is recessed.

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.

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

Preferably, the above-mentioned figure-eight distribution channel is located on the side of the distribution hole close to the adjacent corner hole.

Preferably, the above-mentioned ridges are arranged in a herringbone shape from both sides of the central axis of the first plate or the second plate.

Preferably, the chevron-shaped ridges of the first plate and the chevron-shaped ridges of the second plate are in opposite directions.

The present invention has the following beneficial effects: the present invention sets a first figure-eight groove on the distribution hole of the first plate, and sets a second figure-eight groove on the distribution hole of the second plate, so that the first figure-eight groove is arranged in the distribution hole of the second plate. The groove cooperates with the second figure-eight groove to form a 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 when the refrigerant enters the flow channel of the heat exchanger It has good flow distribution, but the further the whole channel is, the larger the space is, which reduces the flow resistance of molten copper during the brazing process and avoids clogging of the distribution channel during the brazing process, which can effectively improve the yield and product stability.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structure schematic diagram of distribution hole channel in the existing brazed heat exchange plate;

Fig. 2 is the structural representation of the heat exchange plate group of the present invention;

Fig. 3 is an enlarged view of part a in Fig. 2;

Fig. 4 is the structural representation of the first plate of the present invention;

Fig. 5 is an enlarged view of part b in Fig. 4;

Fig. 6 is the structural representation of the second plate of the present invention;

Fig. 7 is an enlarged view of part c in Fig. 6;

In the figure: 1. The first plate; 11. The first figure-eight groove; 12. The ring; 13. The first boss; 131. The first slope; 132. The first convex surface; 133. The connecting slope; 2. 21. The second figure-eight groove; 22. The second boss; 221. The second slope; 222. The second convex surface; 3. The baffle; 41. The ridge; 42. The valley; 43. Corner hole; 44. Distribution hole; 5. Figure-eight distribution channel; 8. No distribution orifice plate; 91. Equal section distribution channel.

Detailed ways

The present invention will now be described in further detail with reference to the embodiments.

A brazed heat exchange plate group with a figure-eight distribution channel, comprising at least two pairs of unit plate groups, each pair of unit plate groups including a first plate 1 and a second plate 2 arranged in layers, the first plate Both the sheet 1 and the second sheet 2 include a main panel and surrounding baffles 3, the main panel is provided with a number of ridges 41, and valleys 42 are formed between adjacent ridges 41, and four corners of the main panel are provided. The round hole is characterized in that: three round holes are corner holes 43, one round hole is a distribution hole 44, the distribution hole 44 of the first plate 1 is provided with a first figure-eight groove 11, and the second plate 2 is provided with a first figure-eight groove 11. The distribution hole 44 is provided with a second figure-eight groove 21, the first figure-eight groove 11 cooperates with the second figure-eight groove 21 to form a figure-eight distribution channel 5, and the end of the figure-eight distribution channel 5 close to the distribution hole 44 is a figure-eight distribution channel 5. The narrower end of the glyph.

The first figure-eight groove 11 and the second figure-eight groove 21 constitute the figure-eight distribution channel 5, and the end of the figure-eight distribution channel 5 close to the distribution hole 44 is the narrower end of the figure-eight, which ensures a smaller refrigerant inlet and makes the refrigerant It can be evenly distributed into each flow channel, but the further the whole distribution channel is, the larger the space is, which reduces the flow resistance of the molten copper during the brazing process, so that the molten copper can smoothly pass through the figure-eight distribution channel 5, so as to avoid the distribution channel during the brazing process. Clogging occurs in the middle, which can effectively improve the yield and product stability.

As shown in Figure 2-3, in general, there is one more water flow channel in the heat exchanger than the refrigerant flow channel, so when assembling the heat exchange plate group into a heat exchanger, the two outermost heat exchange plates are used. No dispensing orifice sheet 8.

In a specific embodiment, as shown in FIGS. 4-5 , the distribution hole 44 of the first plate 1 has a ring of ring pieces 12 around it, and the ring piece 12 has a circle of first bosses 13 around it. The boss 13 includes 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 piece 12 toward the ridge 41 and is inclined toward the opposite direction to the center of the distribution hole 44. The 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 provided on the ring piece 12 and faces the first convex surface. 132 direction depression.

In a specific embodiment, as shown in FIGS. 4-5 , the ring piece 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 .

In a specific embodiment, as shown in FIGS. 4-5 , the depth of the first figure-eight groove 11 is half of 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.

In a specific embodiment, as shown in FIGS. 6-7 , there is a circle of second bosses 22 around the distribution holes 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 in the direction of the ridge 41 along the edge of the distribution hole 44, and is inclined toward the direction of the center of the distribution hole 44, and the second convex surface 222 is along the edge of the second slope 221 in the radial direction of the distribution hole 44 Extending inward, the second figure-eight groove 21 is provided on the second convex surface 222 and is recessed toward the distribution hole 44 .

In a specific embodiment, as shown in FIGS. 6-7 , 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 .

In a specific embodiment, as shown in FIGS. 6-7 , the depth of the second figure-eight groove 21 is half of 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.

In a specific embodiment, as shown in FIGS. 6-7 , the figure-eight distribution channel 5 is located on the side of the distribution hole 44 close to the adjacent corner hole 43 .

In a specific embodiment, as shown in FIGS. 6-7 , the ridges 41 are arranged in a herringbone shape from both sides of the central axis of the first plate 1 or the second plate 2 .

In a specific embodiment, as shown in FIGS. 6-7 , the chevron-shaped ridges 41 of the first plate 1 and the chevron-shaped ridges 41 of the second plate 2 are in opposite directions.

Taking the above ideal embodiments according to the present invention as inspiration, and through the above description, relevant personnel can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the contents in the specification, and the technical scope must be determined according to the scope of the claims.

Claims (10)

1. A brazed heat exchange plate group with a figure-eight distribution channel, comprising at least two pairs of unit plate groups, each pair of the unit plate groups comprising a first plate (1) and a second plate arranged in layers Sheet (2), the first sheet (1) and the second sheet (2) both include a main panel and surrounding baffles (3), the main panel is provided with several ridges (41), A valley (42) is formed between adjacent raised ridges (41), and four circular holes are provided at the four corners of the main panel, characterized in that: three of the circular holes are corner holes (43), and one of the circular holes is a corner hole (43). The hole is a distribution hole (44), the distribution hole (44) of the first plate (1) is provided with a first figure-eight groove (11), and the distribution hole (44) of the second plate (2) ) is provided with a second figure-eight groove (21), and the first figure-eight groove (11) cooperates with the second figure-eight groove (21) to form a figure-eight distribution channel (5). The end of the channel (5) close to the distribution hole (44) is the narrower end of the figure-eight shape. 2 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 1 , characterized in that: the distribution hole ( 44 ) of the first plate ( 1 ) is provided with a ring of rings ( 12 ). ), the ring piece (12) has a circle of first bosses (13) around it, the first bosses (13) include a first slope (131), a first convex surface (132) and a connecting slope (133) ), the first slope (131) extends in the direction of the ridge (41) along the edge of the ring piece (12), and is inclined in the opposite direction to the center of the distribution hole (44), the first convex surface (132) Along the edge of the first ramp (131) extending outwards in the radial direction of the distribution hole (44) and connected with the main panel through the connecting ramp (133), the first figure-eight groove (11) is provided in the ring The sheet (12) is concave in the direction of the first convex surface (132). 3. The brazed heat exchange plate group with a figure-eight distribution channel according to claim 2, characterized in that: the ring plate (12) is flush with the bottom of the valley (42), and the first convex The height of the platform (13) is equal to the height of the ridge (41). 4 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 2 , wherein the depth of the first figure-eight groove ( 11 ) is the height of the first boss ( 13 ). 5 . half of . 5 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 2 , characterized in that: the distribution hole ( 44 ) of the second plate ( 2 ) has a circle of second bosses around the distribution hole ( 44 ). (22), the second boss (22) includes a second slope (221) and a second convex surface (222), the second slope (221) is directed toward the ridge (41) along the edge of the distribution hole (44) The second convex surface (222) extends inwardly in the radial direction of the distribution hole (44) along the edge of the second slope (221), the said The second figure-eight groove (21) is arranged on the second convex surface (222) and is recessed in the direction of the distribution hole (44). 6 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 5 , wherein the height of the second boss ( 22 ) is equal to the height of the ridge ( 41 ). The width of the first convex surface (132) is equal to the width of the second convex surface (222). 7 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 5 , wherein the depth of the second figure-eight groove ( 21 ) is the height of the second boss ( 22 ). 8 . half of . 8 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 1 , wherein the figure-eight distribution channel ( 5 ) is located in the distribution hole ( 44 ) close to the corner hole ( 43) on the side. 9 . The brazed heat exchange plate group with a figure-eight distribution channel according to claim 1 , wherein the raised ridge ( 41 ) extends from the first plate ( 1 ) or the second plate ( 2 ). 10 . The two sides of the central axis are arranged in a herringbone shape. 10. The brazed heat exchange plate group with a figure-eight distribution channel according to claim 9, characterized in that: the herringbone ridge (41) of the first plate (1) and the second plate ( 2) The direction of the chevron ridges (41) is opposite.

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