A brazing seal for a plate-fin heat exchanger

Abstract

This utility model discloses a brazing seal for a plate-fin heat exchanger, relating to the technical field of plate-fin heat exchangers. It includes a seal body with a first surface and a second surface on its upper and lower sides, respectively. The first surface has a first sidewall, a second sidewall, and a third sidewall. The first and second sidewalls are located at opposite ends along the length of the first surface, and the third sidewall is located on the side of the first surface closest to the channel. The first, second, and third sidewalls form a material placement area on the first surface. A plurality of trapezoidal protrusions are provided within the material placement area. These trapezoidal protrusions are arranged at equal intervals along the length of the seal body and along its width. The first and second surfaces are symmetrically arranged vertically. This utility model provides a brazing seal for a plate-fin heat exchanger that, by providing multiple trapezoidal protrusions on the upper and lower sides of the seal body, can evenly separate the solder and prevent misalignment.

Description

Technical Field

[0001] This utility model relates to the field of plate-fin heat exchanger technology, and in particular to a brazing seal for a plate-fin heat exchanger. Background Technology

[0002] Plate-fin heat exchangers are highly efficient and compact heat exchange devices that play a vital role in numerous industrial fields due to their unique structure and superior performance. The core component of a plate-fin heat exchanger is the plate bundle, which consists of baffles, fins, seals, and guide vanes. Fins, guide vanes, and seals are placed between adjacent baffles to form a sandwich layer, called a channel. These sandwich layers are stacked according to different fluid flow patterns and brazed together to form the plate bundle. The seals are long, strip-shaped structural components located on both sides of the plate bundle, providing structural support and a leak-proof seal.

[0003] Plate-fin heat exchangers transfer heat through fins and baffles. Hot and cold fluids flow in separate channels. Heat is first transferred from the hot fluid to the fins and baffles, and then further transferred to the cold fluid via the fins and baffles. Because the fins significantly increase the heat transfer area and effectively turbulent the fluid, disrupting the boundary layer as the fluid flows within the channels, heat transfer efficiency is effectively improved.

[0004] Chinese utility model patent application number 202120676350.5 discloses a tightly connected sealing strip. This patent increases the contact area with the partition by setting a wave structure on the upper and lower sides, thereby improving the stability of the connection after welding. Since solder needs to be filled between the sealing strip and the partition, the wave-shaped curved contact surface on the upper and lower sides of the sealing strip is quite complex. Neither foil solder nor paste solder can be stably positioned. If the solder shifts before welding and cannot be evenly distributed, it will lead to low weld strength and easy cracking during operation. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a brazing seal for a plate-fin heat exchanger. By setting multiple trapezoidal protrusions on the upper and lower sides of the seal body, the solder can be evenly separated and fixed in its respective slots to prevent displacement.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a brazing seal for a plate-fin heat exchanger, comprising a seal body, the seal body including a first surface and a second surface; the first surface is the upper surface of the seal body, corresponding to the upper partition of the plate bundle; the second surface is the lower surface of the seal body, corresponding to the lower partition of the plate bundle; the first surface is provided with a first sidewall, a second sidewall and a third sidewall; along the length direction of the seal body, the first sidewall and the second sidewall are respectively located at both ends of the first surface, and the first sidewall and the second sidewall are arranged along the width direction of the seal body; the third sidewall is arranged along the length direction of the seal body on the side of the first surface near the channel; the end of the first sidewall near the channel and the end of the second sidewall near the channel are respectively connected to both ends of the third sidewall; the first sidewall, the second sidewall and the third sidewall surround a material placement area on the first surface; a plurality of trapezoidal protrusions are provided in the material placement area; the plurality of trapezoidal protrusions are arranged at equal intervals along the length direction of the seal body; the trapezoidal protrusions are arranged along the width direction of the seal body; the first surface and the second surface are symmetrically arranged vertically.

[0008] The brazing seal of the plate-fin heat exchanger provided by this utility model preferably has a trapezoidal boss in the form of a long strip; the cross-section of the trapezoidal boss in the width direction of the seal body is trapezoidal; the width of the upper base of the trapezoidal boss is smaller than the width of the lower base of the trapezoidal boss.

[0009] The brazing seal of the plate-fin heat exchanger provided by this utility model preferably includes a trapezoidal boss comprising a first side and a second side; the first side is a side formed by extending from the waist of one side of the trapezoidal boss; the second side is a side formed by extending from the waist of the other side of the trapezoidal boss; both the first side and the second side are provided with a plurality of guide grooves; the plurality of guide grooves are arranged along the width direction of the seal body; the guide grooves are opened along the height direction.

[0010] The brazing seal of the plate-fin heat exchanger provided by this utility model preferably includes a plurality of grooves in the material placement area; the grooves are formed on the first surface; the grooves are located between adjacent trapezoidal bosses; a groove plate is embedded in the groove; the upper surface of the groove plate is on the same plane as the first surface; a circular groove is provided on the upper surface of the groove plate along the width direction of the seal body.

[0011] The above technical solution has the following advantages or beneficial effects: This utility model provides a brazed sealing strip for a plate-fin heat exchanger, relating to the field of plate-fin heat exchanger technology. It includes a sealing strip body, which comprises a first surface and a second surface. The first surface is the upper surface of the sealing strip body, corresponding to the upper partition of the plate bundle. The second surface is the lower surface of the sealing strip body, corresponding to the lower partition of the plate bundle. The first surface is provided with a first sidewall, a second sidewall, and a third sidewall. Along the length of the sealing strip body, the first sidewall and the second sidewall are respectively located at both ends of the first surface. The first and second sidewalls are arranged along the width direction of the seal body; the third sidewall is arranged along the length direction of the seal body on the side of the first surface near the channel; the end of the first sidewall near the channel and the end of the second sidewall near the channel are respectively connected to the two ends of the third sidewall; the first, second, and third sidewalls form a material placement area on the first surface; the material placement area is provided with a plurality of trapezoidal protrusions; the plurality of trapezoidal protrusions are arranged at equal intervals along the length direction of the seal body; the trapezoidal protrusions are arranged along the width direction of the seal body; the first and second surfaces are symmetrically arranged vertically. The brazing seal for a plate-fin heat exchanger provided by this utility model, by providing multiple trapezoidal protrusions on the upper and lower sides of the seal body, can evenly separate the solder and fix the solder in its respective slots, preventing displacement. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0013] Figure 1 This is a structural diagram of the upper half of the brazed seal of a plate-fin heat exchanger provided in Embodiment 1 of this utility model;

[0014] Figure 2 This is a structural diagram of the trapezoidal boss of the brazing seal of a plate-fin heat exchanger provided in Embodiment 1 of this utility model;

[0015] Figure 3 This is a structural diagram of the groove plate of the brazing seal of a plate-fin heat exchanger provided in Embodiment 1 of this utility model;

[0016] Figure 1-3 It includes: 1. Seal body; 11. First surface; 12. First sidewall; 13. Second sidewall; 14. Third sidewall; 2. Trapezoidal boss; 21. Guide channel; 3. Channel plate; 31. Circular channel. Detailed Implementation

[0017] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0018] Example 1:

[0019] like Figure 1-3 As shown:

[0020] This utility model provides a brazed sealing strip for a plate-fin heat exchanger, comprising a sealing strip body 1, which includes a first surface 11 and a second surface; the first surface 11 is the upper surface of the sealing strip body 1, corresponding to the upper partition of the plate bundle; the second surface is the lower surface of the sealing strip body 1, corresponding to the lower partition of the plate bundle; the first surface 11 is provided with a first sidewall 12, a second sidewall 13, and a third sidewall 14; along the length direction of the sealing strip body 1, the first sidewall 12 and the second sidewall 13 are respectively provided at both ends of the first surface 11, and the first sidewall 12 and the second sidewall 13 extend along the sealing strip body. The width direction of the seal body 1 is set; the third sidewall 14 is set along the length direction of the seal body 1 on the side of the first surface 11 near the channel; the end of the first sidewall 12 near the channel and the end of the second sidewall 13 near the channel are respectively connected to the two ends of the third sidewall 14; the first sidewall 12, the second sidewall 13 and the third sidewall 14 are arranged on the first surface 11 to form a material placement area; a plurality of trapezoidal protrusions 2 are provided in the material placement area; the plurality of trapezoidal protrusions 2 are arranged at equal intervals along the length direction of the seal body 1; the trapezoidal protrusions 2 are set along the width direction of the seal body 1; the first surface 11 and the second surface are arranged symmetrically from top to bottom.

[0021] When installing the brazed seal of the plate-fin heat exchanger provided by this utility model, the solder is placed between adjacent trapezoidal protrusions 2 in advance, and then the upper and lower partitions are pressed onto the seal body 1. By placing the solder in the gap between adjacent trapezoidal protrusions 2, the amount of solder in each section can be ensured to be the same, making the distribution of solder on the seal more uniform and avoiding differences in welding quality caused by too much or too little solder in some areas. During the welding process, the uniform distribution of solder can ensure the consistency of welding heat input, which helps to form a uniform and continuous weld, reduces the generation of welding defects such as porosity and slag inclusions, improves the stability and consistency of the welding quality of the plate-fin heat exchanger seal, and increases the product qualification rate.

[0022] The brazing seal of the plate-fin heat exchanger provided by this utility model can better control the amount of solder in each section by setting a solder placement space between adjacent trapezoidal protrusions 2, thus avoiding differences in welding quality caused by too much or too little solder in some areas.

[0023] Since the seal needs to be welded to the partition on both the top and bottom sides, the more solder at the joint, the more fully the gap between the seal and the partition will be filled. To ensure the solder fully fills the gap, in a preferred embodiment, the trapezoidal protrusion 2 has a long, narrow structure; the cross-section of the trapezoidal protrusion 2 in the width direction of the seal body 1 is trapezoidal; the width of the upper base of the trapezoidal protrusion 2 is smaller than the width of the lower base. Taking the structure on the first surface 11 as an example, the space between adjacent trapezoidal protrusions 2 is called the placement space. Because the cross-section of the trapezoidal protrusion 2 is trapezoidal, the upper part of the placement space is narrower and the lower part is wider, so the solder piled up is more at the top than at the bottom. This changes the traditional flat solder distribution. During welding, this distribution of solder, with more solder at the top and less at the bottom, allows the solder to better fill the gap between the seal body 1 and the partition under gravity and capillary action, avoiding problems such as solder flow and insufficient accumulation leading to incomplete welding or weak welds, thereby improving welding strength.

[0024] The brazing seal of the plate-fin heat exchanger provided by this utility model has a trapezoidal boss 2 forming a placement space that is wider at the top and narrower at the bottom, which can better fill the gap between the seal and the partition, thereby improving the welding strength.

[0025] During brazing heating, the solder melts and flows. To ensure uniform solder flow, in a preferred embodiment, the trapezoidal boss 2 includes a first side and a second side. The first side is formed by extending from one side of the trapezoidal boss 2 along its waist; the second side is formed by extending from the other side of the trapezoidal boss 2 along its waist. Both the first and second sides are provided with a plurality of guide grooves 21. The guide grooves 21 are arranged along the width direction of the seal body 1 and along its height direction. The guide grooves 21 guide the solder to flow in a set direction, and the arrangement of multiple guide grooves 21 allows the solder in a region to flow in the same direction, improving the uniformity of the solder. In addition, during the installation stage before welding, the protrusions formed by the edges of the guide grooves 21 increase the contact area between the seal body 1 and the solder, increasing the friction and mechanical interlocking force between them, preventing the solder from shifting during placement and assembly, and simultaneously increasing the contact area between the solder and the trapezoidal boss 2, improving the stability of the solder.

[0026] The brazing seal of the plate-fin heat exchanger provided by this utility model can guide the solder to flow in a set direction by opening a guide groove 21 on the trapezoidal boss 2, thereby improving the uniformity of the solder; it also increases the contact area between the seal body 1 and the solder, increasing the friction and mechanical interlocking force between the two, and preventing the solder from shifting during placement and assembly.

[0027] When the solder used for brazing is foil material, in a preferred embodiment, to prevent the solder placed on the first surface 11 from sliding during installation, a plurality of grooves are provided in the placement area; the grooves are formed on the first surface 11; the grooves are located between adjacent trapezoidal bosses 2; a groove plate 3 is embedded in the groove; the upper surface of the groove plate 3 is on the same plane as the first surface 11; a circular groove 31 is provided on the upper surface of the groove plate 3 along the width direction of the sealing strip body 1. The circular groove 31 of the groove plate 3 can accommodate foil solder. Since solid solder is generally cylindrical, the circular groove 31 is designed as a circular structure to better accommodate the solder. When one or more welding rods are placed in the circular groove 31, a fixed anchor point can be formed in the placement area between adjacent trapezoidal bosses 2, which helps to stabilize other welding rods in the area, and the stability of the welding rods can be further improved by the pressure of the partition.

[0028] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application filed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not claimed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

[0029] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A brazed seal for a plate-fin heat exchanger, comprising a seal body, the seal body including a first surface and a second surface; the first surface being the upper surface of the seal body, the first surface corresponding to the upper partition of a plate bundle; the second surface being the lower surface of the seal body, the second surface corresponding to the lower partition of the plate bundle; characterized in that, The first surface is provided with a first sidewall, a second sidewall, and a third sidewall; along the length direction of the seal body, the first sidewall and the second sidewall are respectively located at both ends of the first surface, and the first sidewall and the second sidewall are arranged along the width direction of the seal body; the third sidewall is arranged along the length direction of the seal body on the side of the first surface near the channel; the end of the first sidewall near the channel and the end of the second sidewall near the channel are respectively connected to the two ends of the third sidewall; the first sidewall, the second sidewall, and the third sidewall surround the first surface to form a material placement area; the material placement area is provided with a plurality of trapezoidal protrusions; the plurality of trapezoidal protrusions are arranged at equal intervals along the length direction of the seal body; the trapezoidal protrusions are arranged along the width direction of the seal body; the first surface and the second surface are arranged symmetrically from top to bottom.

2. The brazed sealing strip for the plate-fin heat exchanger according to claim 1, characterized in that, The trapezoidal protrusion has a long strip-shaped structure; the cross-section of the trapezoidal protrusion in the width direction of the seal body is trapezoidal; the width of the upper base of the trapezoidal protrusion is smaller than the width of the lower base of the trapezoidal protrusion.

3. The brazed sealing strip for the plate-fin heat exchanger according to claim 2, characterized in that, The trapezoidal protrusion includes a first side and a second side; the first side is a side formed by extending from the waist of one side of the trapezoidal protrusion; the second side is a side formed by extending from the waist of the other side of the trapezoidal protrusion; both the first side and the second side are provided with a plurality of guide grooves; the plurality of guide grooves are arranged along the width direction of the seal body; the guide grooves are opened along the height direction.

4. The brazed sealing strip for the plate-fin heat exchanger according to claim 1, characterized in that, The material placement area is also provided with several grooves; the grooves are opened on the first surface; the grooves are located between adjacent trapezoidal protrusions; a groove plate is embedded in the groove; the upper surface of the groove plate is located on the same plane as the first surface; a circular groove is provided on the upper surface of the groove plate along the width direction of the seal body.

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