Pressure-resistant structure of heat exchange last piece of brazed plate heat exchanger
By filling metal washer on the inner side of the heat exchange end piece of the brazed plate heat exchanger to support the brazing joints, the problem of the existing heat exchanger failure under high-pressure refrigeration conditions is solved, and a higher pressure bearing capacity and scope of application are achieved.
Patent Information
- Application Number
- CN202420531160.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-19
AI Technical Summary
The existing brazed plate heat exchangers fail under high-pressure refrigeration conditions. The failure leakage point is mainly at the brazing position between the last plate and the last heat exchange plate, and cannot effectively withstand pressures above 3.0Mpa.
A brazed plate heat exchanger heat exchange final sheet pressure resistant structure is designed. By filling metal washer on the inner side of the end of the heat exchange plate, supporting the brazing points, forming a fixed connection between the intermediate sheet and the end sheet of multiple groups of heat exchange plates, enhancing the overall pressure bearing capacity.
The design can meet design pressures of no more than 4.5Mpa, significantly improve the product's pressure bearing capacity, and expand the product's scope of application without adding additional costs and design optimization.
Smart Images
Figure CN222579012U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to a pressure-resistant structure of a heat exchange end plate of a brazed plate heat exchanger. Background Art
[0002] Brazed plate heat exchanger is a compact, efficient and maintenance-free heat exchanger. Its basic structure is a series of stable flow channels formed inside the heat exchanger by brazing a plurality of continuously arranged heat exchange plates with flow channel inlets and outlets. The principle is that the fluid medium alternately enters the internal plate flow channel of the heat exchanger in different directions to achieve the purpose of heat exchange. It is suitable for heating and cooling conditions in many applications.
[0003] The general design and operating pressure of the brazed plate heat exchanger is ≤3.0Mpa, but under refrigeration application conditions, the general operating pressure of the refrigerant is higher than 3.0Mpa, which results in the brazed plate heat exchanger with conventional structural design being unable to effectively cope with refrigeration conditions. Therefore, multiple groups of comparative destructive tests (burst tests) of multiple models were conducted. The tests found that the brazed plate heat exchanger failed under the burst test pressure, and its failure leakage points were all at the brazing position at the interface between the last plate and the last heat exchange plate. Under the burst test pressure, the bottom plate and the last plate undergo plastic deformation at the interface position. Therefore, the utility model proposes a pressure-resistant structure for the heat exchange last plate of a brazed plate heat exchanger to solve the problems existing in the prior art. Summary of the invention
[0004] In view of the above problems, the utility model proposes a pressure-resistant structure for the heat exchange end plate of a brazed plate heat exchanger. The pressure-resistant structure for the heat exchange end plate of a brazed plate heat exchanger can meet the refrigeration conditions with a design pressure not higher than 4.5Mpa, greatly improving the product's pressure-bearing capacity and improving product competitiveness without increasing excessive additional costs and design optimization.
[0005] To achieve the purpose of the utility model, the utility model is implemented by the following technical solutions: a pressure-resistant structure of a heat exchanger end plate of a brazed plate heat exchanger, comprising a heat exchange plate middle plate, a heat exchange plate end plate and a metal gasket, wherein the heat exchange plate end plate is arranged on one side of the heat exchange plate middle plate, and the edges of the heat exchange plate middle plate and the heat exchange plate end plate are both provided with interfaces, and a metal gasket is provided on the inner side of the interface of the heat exchange plate end plate, and the metal gasket supports the upper and lower surfaces of the inner side of the interface of the heat exchange plate end plate;
[0006] The heat exchange plate middle sheets are provided with multiple groups, and the interfaces of the multiple groups of heat exchange plate middle sheets are fixedly connected by brazing points, and the interface of the heat exchange plate end sheet and the interface of the heat exchange plate middle sheet on one side are fixedly connected by brazing points.
[0007] A further improvement is that the middle plate of the heat exchange plate and the last plate of the heat exchange plate are both of an integrally formed structure, and the middle plate of the heat exchange plate and the last plate of the heat exchange plate are located on the same central axis.
[0008] A further improvement is that an inner cavity is provided on the inner side of the last piece of the heat exchange plate, and the cross section of the inner cavity is hexagonal.
[0009] A further improvement is that the metal gasket fills two-thirds of the space inside the interface of the last piece of the heat exchange plate.
[0010] A further improvement is that the metal gasket comprises an outer metal ring body and reinforcing ribs, a filling cavity is provided on the inner side of the outer metal ring body, and the reinforcing ribs are provided inside the filling cavity.
[0011] A further improvement is that the inner side of the interface is inclined, and the inner side of the metal gasket is provided with an inclined surface, and the inclined surface is adapted to the inclined angle of the inner side of the interface of the last piece of the heat exchange plate.
[0012] A further improvement is that the middle plate of the heat exchange plate and the last plate of the heat exchange plate have the same size, and one side of the last plate of the heat exchange plate is used for connecting to the bottom plate of the brazed plate heat exchanger.
[0013] The beneficial effects of the utility model are:
[0014] 1. The utility model fills a metal gasket on the inner side of the interface of the last piece of the heat exchange plate to support the brazing point, which can meet the refrigeration conditions with a design pressure of no more than 4.5Mpa, greatly improves the pressure bearing capacity of the product, improves the product competitiveness without increasing excessive additional costs and design optimization, and effectively expands the scope of application of the product.
[0015] 2. The metal gasket of the utility model is composed of an outer metal ring body and reinforcing ribs. The reinforcing ribs filled inside enhance the overall strength of the metal gasket and provide better pressure-bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a cross-sectional schematic diagram of the utility model;
[0017] Figure 2 It is a schematic diagram of the metal gasket of the utility model.
[0018] Among them: 1. middle plate of heat exchange plate; 2. end plate of heat exchange plate; 3. interface; 4. metal gasket; 5. brazing point; 6. inner cavity; 7. reinforcing rib; 8. bevel surface; 9. outer metal ring. DETAILED DESCRIPTION
[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with an embodiment. The embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention. Embodiment 1
[0020] according to Figure 1 , 2 As shown, this embodiment proposes a pressure-resistant structure of a heat exchanger end plate of a brazed plate heat exchanger, comprising a heat exchange plate middle plate 1, a heat exchange plate end plate 2 and a metal gasket 4, wherein the heat exchange plate end plate 2 is arranged on one side of the heat exchange plate middle plate 1, and the edges of the heat exchange plate middle plate 1 and the heat exchange plate end plate 2 are both provided with an interface 3, and a metal gasket 4 is provided inside the interface 3 of the heat exchange plate end plate 2, and the metal gasket 4 supports the upper and lower surfaces inside the interface 3 of the heat exchange plate end plate 2;
[0021] The heat exchange plate middle sheet 1 is provided with multiple groups, and the interfaces 3 of the multiple groups of the heat exchange plate middle sheets 1 are fixedly connected by brazing points 5, and the interfaces 3 of the heat exchange plate end sheet 2 and the interfaces 3 of the heat exchange plate middle sheet 1 on one side are fixedly connected by brazing points 5. When in use, a metal gasket 4 is filled inside the interface 3 of the heat exchange plate end sheet 2 to support the brazing point 5, which can meet the refrigeration condition of the design pressure not higher than 4.5Mpa, greatly improving the pressure bearing capacity of the product. After experimental verification, in the absence of the metal gasket 4, the brazed plate heat exchanger fails and leaks after the burst test pressure reaches 12MPa. However, the brazed plate heat exchanger with the same batch and specification with the metal gasket 4 structure can fully meet the burst pressure of 12MPa. Under the effective support of the metal gasket 4, its burst test can reach 180Mpa, and its effective design pressure is confirmed to be 45Mpa according to ASME UG-101. It has higher pressure bearing strength.
[0022] The heat exchange plate middle piece 1 and the heat exchange plate end piece 2 are both integrally formed, and the heat exchange plate middle piece 1 and the heat exchange plate end piece 2 are located on the same central axis. The heat exchange plate middle piece 1 and the heat exchange plate end piece 2 can be circular, the interface 3 is designed in a circular ring around the inner edge, and the metal gasket 4 is filled into the interior of the interface 3.
[0023] The inner side of the heat exchange plate end sheet 2 is provided with an inner cavity 6, and the cross section of the inner cavity 6 is hexagonal. The arrangement of the inner cavity 6 and the support of the hexagonal structure further improve the pressure bearing performance of the heat exchange plate end sheet 2.
[0024] The heat exchange plate middle sheet 1 and the heat exchange plate end sheet 2 have the same size, and one side of the heat exchange plate end sheet 2 is used to connect the bottom plate of the brazed plate heat exchanger. The heat exchange plate end sheet 2 is located between the plurality of heat exchange plate middle sheets 1 and the bottom plate, and the metal gasket 4 is provided so that the interface 3 is not deformed under pressure. Embodiment 2
[0025] according to Figure 1 , 2 As shown, this embodiment proposes a pressure-resistant structure of a heat exchanger end plate of a brazed plate heat exchanger, comprising a heat exchange plate middle plate 1, a heat exchange plate end plate 2 and a metal gasket 4, wherein the heat exchange plate end plate 2 is arranged on one side of the heat exchange plate middle plate 1, and the edges of the heat exchange plate middle plate 1 and the heat exchange plate end plate 2 are both provided with an interface 3, and a metal gasket 4 is provided inside the interface 3 of the heat exchange plate end plate 2, and the metal gasket 4 supports the upper and lower surfaces inside the interface 3 of the heat exchange plate end plate 2;
[0026] The heat exchange plate middle sheet 1 is provided with multiple groups, and the interfaces 3 of the multiple groups of the heat exchange plate middle sheets 1 are fixedly connected by brazing points 5, and the interfaces 3 of the heat exchange plate end sheet 2 and the interfaces 3 of the heat exchange plate middle sheet 1 on one side are fixedly connected by brazing points 5. When in use, a metal gasket 4 is filled inside the interface 3 of the heat exchange plate end sheet 2 to support the brazing point 5, which can meet the refrigeration condition of the design pressure not higher than 4.5Mpa, greatly improving the pressure bearing capacity of the product. After experimental verification, in the absence of the metal gasket 4, the brazed plate heat exchanger fails and leaks after the burst test pressure reaches 12MPa. However, the brazed plate heat exchanger with the same batch and specification with the metal gasket 4 structure can fully meet the burst pressure of 12MPa. Under the effective support of the metal gasket 4, its burst test can reach 180Mpa, and its effective design pressure is confirmed to be 45Mpa according to ASME UG-101. It has higher pressure bearing strength.
[0027] The metal gasket 4 fills two-thirds of the space inside the interface 3 of the heat exchange plate end 2. According to installation requirements, the interface 3 is not completely filled, and residual space is left.
[0028] The metal gasket 4 includes an outer metal ring body 9 and a reinforcing rib 7. A filling cavity is provided inside the outer metal ring body 9, and the reinforcing rib 7 is provided inside the filling cavity. The inner side of the interface 3 is inclined at an angle, and an angled surface 8 is provided inside the metal gasket 4. The angled surface 8 is adapted to the inner angle of the interface 3 of the heat exchange plate end 2. The metal gasket 4 is composed of an outer metal ring body 9 and a reinforcing rib 7. The reinforcing rib 7 filled inside enhances the overall strength of the metal gasket 4, and the pressure-bearing performance is better. The inner angled surface 8 of the metal gasket 4 is adapted to the inner angle of the interface 3 of the heat exchange plate end 2, and the fit is more stable.
[0029] The heat exchange plate middle sheet 1 and the heat exchange plate end sheet 2 have the same size, and one side of the heat exchange plate end sheet 2 is used to connect the bottom plate of the brazed plate heat exchanger. The heat exchange plate end sheet 2 is located between the plurality of heat exchange plate middle sheets 1 and the bottom plate, and the metal gasket 4 is provided so that the interface 3 is not deformed under pressure.
[0030] The heat exchange end plate pressure-resistant structure of the brazed plate heat exchanger fills the metal gasket 4 inside the interface 3 of the heat exchange plate end plate 2 to support the brazing point 5, which can meet the refrigeration conditions of the design pressure not higher than 4.5Mpa, greatly improving the pressure-bearing capacity of the product, improving the product competitiveness without adding too much extra cost and design optimization, and effectively expanding the scope of application of the product. The metal gasket 4 of this product is composed of an outer metal ring body 9 and a reinforcing rib 7. The reinforcing rib 7 filled inside enhances the overall strength of the metal gasket 4 and has better pressure-bearing performance.
[0031] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A pressure-resistant structure of a heat exchanger end plate of a brazed plate heat exchanger, comprising a heat exchange plate middle plate (1), a heat exchange plate end plate (2) and a metal gasket (4), characterized in that: The heat exchange plate end piece (2) is arranged on one side of the heat exchange plate middle piece (1), and the edges of the heat exchange plate middle piece (1) and the heat exchange plate end piece (2) are both provided with interfaces (3), and a metal gasket (4) is provided on the inner side of the interface (3) of the heat exchange plate end piece (2), and the metal gasket (4) supports the upper and lower sides of the inner side of the interface (3) of the heat exchange plate end piece (2); The heat exchange plate intermediate sheets (1) are provided with a plurality of groups, and the interfaces (3) of the plurality of groups of the heat exchange plate intermediate sheets (1) are fixedly connected via brazing points (5), and the interface (3) of the heat exchange plate end sheet (2) and the interface (3) of the heat exchange plate intermediate sheet (1) on one side are fixedly connected via brazing points (5).
2. The pressure-resistant structure of the heat exchange end plate of a brazed plate heat exchanger according to claim 1, characterized in that: The heat exchange plate middle plate (1) and the heat exchange plate end plate (2) are both of an integrally formed structure, and the heat exchange plate middle plate (1) and the heat exchange plate end plate (2) are located on the same central axis.
3. The pressure-resistant structure of the heat exchange end plate of a brazed plate heat exchanger according to claim 1, characterized in that: An inner cavity (6) is provided on the inner side of the heat exchange plate end sheet (2), and the cross section of the inner cavity (6) is hexagonal.
4. The pressure-resistant structure of the heat exchange end plate of a brazed plate heat exchanger according to claim 1, characterized in that: The metal gasket (4) fills two-thirds of the space inside the interface (3) of the heat exchange plate end sheet (2).
5. The pressure-resistant structure of the heat exchange end plate of a brazed plate heat exchanger according to claim 4, characterized in that: The metal gasket (4) comprises an outer metal ring body (9) and reinforcing ribs (7); a filling cavity is provided on the inner side of the outer metal ring body (9); and the reinforcing ribs (7) are provided inside the filling cavity.
6. A pressure-resistant structure for the heat exchange end plate of a brazed plate heat exchanger according to claim 5, characterized in that: The inner side of the interface (3) is inclined at an angle, and the inner side of the metal gasket (4) is provided with an inclined surface (8), wherein the inclined surface (8) is adapted to the inner side inclined angle of the interface (3) of the heat exchange plate end piece (2).
7. The pressure-resistant structure of the heat exchange end plate of a brazed plate heat exchanger according to claim 1, characterized in that: The heat exchange plate middle plate (1) and the heat exchange plate last plate (2) have the same size, and one side of the heat exchange plate last plate (2) is used for connecting to the bottom plate of the brazed plate heat exchanger.