High-pressure-resistant heat exchanger and welding method thereof

Abstract

The invention belongs to the technical field of high-pressure resistance and welding of heat exchangers, and relates to a high-pressure-resistant heat exchanger and a welding method thereof. Comprising a front sealing head, a bolt, a sealing ring, a core body assembly and a rear sealing head, under the condition that the size and the weight of a product are guaranteed, the high-pressure resistance of the product is improved, the product structure is more simplified, weld joints are fewer, and the reliability is remarkably improved. Under the condition that the performance of the product is not affected, the pressure resistance of the product is improved, the service life and reliability of the heat exchanger are improved, the weight and size of the product are reduced, the development requirements of airborne equipment in the future are met, the application direction is wide, and the application prospect is good. The heat exchanger can be matched with various aero-engines and other severe use working condition environments to be expanded and applied, and the effects of light weight and high reliability are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of high pressure resistance and welding of heat exchangers, and relates to a high pressure resistant heat exchanger and a welding method thereof. Background Art

[0002] Today's society has an increasing demand for long-life, high-reliability aviation equipment. As the power of airborne equipment increases, the demand for heat exchange becomes more and more urgent. As a major device for heat dissipation of airborne equipment, heat exchangers play an increasingly important role. However, the pressure of the heat exchanger fluid is getting higher and higher. At the fluid inlet and fluid bend in the pipe, the radiator head is often impacted by the high-pressure fluid, which seriously restricts the extension of the product's service life and the improvement of its reliability. Current heat exchangers often increase the thickness to achieve improved pressure resistance, but due to the weight and outer size limitations of the product, increasing the wall thickness will inevitably sacrifice the product's heat exchange performance, and will not take advantage of the lightweight and reliability improvement of aviation equipment. The present invention proposes a new type of high-pressure resistant heat exchanger that can meet its high-pressure resistance requirements while ensuring the size and weight of the product. Summary of the invention

[0003] Purpose of the Invention

[0004] A new type of high-pressure heat exchanger is proposed to improve the high-pressure resistance of the product while ensuring the size and weight of the product, so that the product structure is simpler, the welds are reduced, and the reliability is significantly improved.

[0005] Technical Solution

[0006] A high-pressure heat exchanger, comprising a front head, bolts, a sealing ring, a core assembly and a rear head; the core assembly comprises a shell and a core; the core comprises a rear end plate, a heat dissipation pipe, a front end plate and a partition; the two sides of the heat dissipation pipe are respectively connected to the front end plate and the rear end plate by welding to form a core, and the core is then welded to the shell, threaded holes are tapped on the front end plate and the rear end plate, the front head is welded to the side of the core assembly close to the front end plate, the rear head is welded to the side of the core assembly close to the rear end plate, the bolts penetrate into the front head and are assembled with the front end plate on the core assembly through threaded holes, and are sealed with a sealing ring; the structure of one side of the rear head is the same as the connection form of one side of the front head; the rear head adopts a hemispherical structure; the heat dissipation pipe adopts a bamboo bionic structure, and a telescopic throat is arranged on the heat dissipation pipe.

[0007] Furthermore, the depth of the tapped threaded holes on the front end plate should be consistent with the depth of the tapped threaded holes on the rear end plate.

[0008] Furthermore, the effective depth of the threaded hole should be greater than 8 threads to provide effective thread engagement and improve the connection strength.

[0009] Furthermore, the number of the telescopic throats is 14, which are evenly arranged on the heat dissipation pipe.

[0010] Furthermore, the bolts are specifically standard hexagonal or dodecagonal bolts for quick disassembly.

[0011] Furthermore, the bolts are embedded in the front head and the rear head so that the bolts do not protrude from the product surface, which facilitates installation and avoids interference.

[0012] The heat exchanger product structure adopts a shell-and-tube structure.

[0013] The front head, the rear head and the shell in the core assembly are connected by electron beam welding.

[0014] The sealing structure at the connection between the front head, rear head and bolts should adopt the type II sealing structure in HB 4-57.

[0015] The rear head adopts a hemispherical structure, which improves the pressure bearing capacity of the product and reduces the weight and volume.

[0016] A welding method for a high pressure heat exchanger comprises the following steps:

[0017] Step 1, the rear end plate, the heat dissipation pipe, the partition plate and the front end plate are assembled and brazed to form a core body;

[0018] Step 2: electron beam welding the core and the shell to form a core assembly;

[0019] Step 3: Machining the side of the core assembly close to the rear end plate to form an electron beam welded structural joint, the protruding height of the welding lock bottom step is 0.5mm, the tolerance is -0.1 to 0mm, and the tolerance of the outer circle of the lock bottom step is 0 to 0.1mm; the electron beam welded structural joint of the core assembly close to the front end plate is the same;

[0020] Step 4: Machining the rear end cap to form an electron beam welded structural joint, the welding lock bottom depression depth is 0.5 mm, the tolerance is 0-0.1 mm; the outer circle tolerance of the lock bottom step is -0.1-0 mm; the electron beam welded structural joint of the front end cap is of the same form;

[0021] Step 5: butt-joint the electron beam welded structural joint of the core assembly near the rear end plate with the electron beam welded structural joint of the rear end head, and fix them by spot welding; the electron beam welded structural joint of the core assembly near the front end plate and the electron beam welded structural joint of the front end head are assembled and fixed in the same way;

[0022] Step 6: Electron beam welding the electron beam welding structural joint of the core assembly near the rear end plate and the rear end head to form an electron beam welding structural joint; the electron beam welding structural joint of the core assembly near the front end plate is welded in the same manner as the electron beam welding structural joint of the front end head.

[0023] The beneficial effects of this application are:

[0024] As a major device for cooling airborne equipment, heat exchangers play an increasingly important role. Research on the high-pressure resistant structure of heat exchangers improves the pressure resistance of products without affecting performance, increases the service life and reliability of heat exchangers, reduces the weight and volume of products, meets the development needs of future airborne equipment, has a wide range of applications and good application prospects, and can be used in various types of aircraft engines and other harsh working conditions to expand the application of heat exchangers, achieving lightweight and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a high pressure heat exchanger;

[0026] Figure 2 It is a schematic diagram of the brazing structure of the core (9);

[0027] Figure 3 It is a schematic diagram of the electron beam welding structural joint of the rear head (5);

[0028] Figure 4 It is a schematic diagram of the electron beam welding structural joint on the side of the core assembly (4) close to the rear end plate (6);

[0029] Figure 5 An electron beam weld position diagram of an electron beam welded structural joint formed between an electron beam welded structural joint on one side of a core assembly (4) close to a rear end plate (6) and a rear end cover (5);

[0030] Figure 6 Schematic diagram of the process of the heat exchanger welding method. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0032] A high-pressure heat exchanger comprises a front head (1), bolts (2), a sealing ring (3), a core assembly (4), and a rear head (5); the core assembly (4) comprises a shell (8) and a core (9); the core (9) comprises a rear end plate (6), a heat dissipation pipe (7), a front end plate (11), and a partition (10); the two sides of the heat dissipation pipe (7) are respectively connected to the front end plate (11) and the rear end plate (6) by welding to form a core (9); the core (9) is further connected to the shell (8) by welding; the front end plate (11) and the rear end plate (6) are threaded holes; the front head (1) is threaded holes; the The rear end cap (5) is connected to the side of the core assembly (4) close to the front end plate (11) by welding, and the rear end cap (5) is connected to the side of the core assembly (4) close to the rear end plate (6) by welding. The bolt (2) penetrates the front end cap (1) and is assembled with the front end plate (11) on the core assembly (4) through a threaded hole, and is sealed by a sealing ring (3). The structure of one side of the rear end cap (5) is the same as the connection form of one side of the front end cap (1). The rear end cap (5) adopts a hemispherical structure. The heat dissipation pipe (7) adopts a bamboo bionic structure, and a telescopic throat is arranged on the heat dissipation pipe (7).

[0033] Furthermore, the depth of the tapped threaded hole on the front end plate (11) should be consistent with the depth of the tapped threaded hole on the rear end plate (6).

[0034] Furthermore, the effective depth of the threaded hole should be greater than 8 threads to provide effective thread engagement and improve the connection strength.

[0035] Furthermore, the number of the telescopic throats is 14, which are evenly arranged on the heat dissipation pipe (7).

[0036] Furthermore, the bolt (2) is specifically a standard hexagonal or dodecagonal bolt, which is convenient for quick disassembly.

[0037] Furthermore, the bolts (2) are embedded in the front head (1) and the rear head (5) so that the bolts do not protrude from the surface of the product, which facilitates installation and avoids interference.

[0038] The heat exchanger product structure adopts a shell-and-tube structure.

[0039] The front head (1), the rear head (5) and the shell (8) in the core assembly are connected by electron beam welding.

[0040] The sealing structure at the connection between the front head (1), the rear head (5) and the bolt (2) should adopt the type II sealing structure in HB 4-57.

[0041] The rear sealing head (5) adopts a hemispherical structure, which improves the pressure bearing capacity of the product and reduces the weight and volume.

[0042] A welding method for a high pressure heat exchanger comprises the following steps:

[0043] Step 1, the rear end plate (6), the heat dissipation pipe (7), the partition plate (10) and the front end plate (11) are assembled and brazed to form a core body (9);

[0044] Step 2: The core (9) and the shell (8) are electron beam welded to form a core assembly (4);

[0045] Step 3: machining the side of the core assembly (4) close to the rear end plate (6) to form an electron beam welded structural joint, the protruding height of the welded lock bottom step is 0.5 mm, the tolerance is (-0.1 to 0) mm, and the tolerance of the outer circle of the lock bottom step is (0 to 0.1) mm; the electron beam welded structural joint on the side of the core assembly (4) close to the front end plate (11) is of the same form;

[0046] Step 4: machining the rear end cap (5) to form an electron beam welded structural joint, the welded lock bottom depression depth is 0.5 mm, and the tolerance is (0 to 0.1) mm; the outer circle tolerance of the lock bottom step is (-0.1 to 0) mm; the electron beam welded structural joint of the front end cap (1) is of the same form;

[0047] Step 5: The electron beam welded structural joint on the side of the core assembly (4) close to the rear end plate (6) is butt-jointed with the rear end cover (5) to form an electron beam welded structural joint, and then fixed by spot welding; the electron beam welded structural joint on the side of the core assembly (4) close to the front end plate (11) is assembled and fixed in the same manner as the electron beam welded structural joint on the front end cover (1);

[0048] Step 6: Electron beam welding is performed to form an electron beam welding structural joint between the electron beam welding structural joint on the side of the core component (4) close to the rear end plate (6) and the rear head (5); the electron beam welding structural joint on the side of the core component (4) close to the front end plate (11) is welded in the same manner as the electron beam welding structural joint on the front head (1).

[0049] It is understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and unless defined as here, will not be interpreted with idealized or overly formal meanings. The specific implementation methods described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment of equivalent changes for application in other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc., made according to the technical essence of the present invention, should be included in the protection scope of the present invention.

Claims

1. A high pressure heat exchanger, characterized in that: It includes a front head, bolts, a sealing ring, a core assembly and a rear head; the core assembly includes a shell and a core; the core includes a rear end plate, a heat dissipation pipe, a front end plate and a partition; the two sides of the heat dissipation pipe are respectively connected to the front end plate and the rear end plate by welding to form a core, and the core is then welded to the shell, threaded holes are tapped on the front end plate and the rear end plate, the front head is welded to the side of the core assembly close to the front end plate, the rear head is welded to the side of the core assembly close to the rear end plate, the bolts penetrate into the front head, and are assembled with the front end plate on the core assembly through threaded holes, and are sealed with a sealing ring; the structure of one side of the rear head is the same as the connection form of one side of the front head; the rear head adopts a hemispherical structure; the heat dissipation pipe adopts a bamboo bionic structure, and a telescopic throat is arranged on the heat dissipation pipe.

2. The switch according to claim 1, characterized in that The depth of the tapped holes on the front plate should be consistent with the depth of the tapped holes on the rear plate.

3. The switch according to claim 2, characterized in that The effective depth of the threaded hole should be greater than 8 threads to provide effective thread engagement and improve connection strength.

4. The switch according to claim 3, characterized in that The number of the telescopic throats is 14, which are evenly arranged on the heat dissipation pipe.

5. The switch according to claim 4, characterized in that The bolts are specifically standard hexagonal or dodecagonal bolts, which are convenient for quick disassembly.

6. The switch according to claim 5, characterized in that The bolts are embedded in the front head and the rear head so that the bolts do not protrude from the product surface, which facilitates installation and avoids interference; the heat exchanger product structure adopts a shell-and-tube structure.

7. The switch according to claim 6, characterized in that The front head, the rear head and the shell in the core assembly are connected by electron beam welding.

8. The switch according to claim 7, characterized in that The sealing structure at the connection between the front head, rear head and bolts should adopt the type II sealing structure in HB 4-57.

9. The switch according to claim 8, characterized in that The rear head adopts a hemispherical structure, which improves the pressure bearing capacity of the product and reduces the weight and volume.

10. The welding method of the exchanger according to claim 9, characterized in that: The steps include: Step 1, the rear end plate, the heat dissipation pipe, the partition plate and the front end plate are assembled and brazed to form a core body; Step 2: electron beam welding the core and the shell to form a core assembly; Step 3: Machining the side of the core assembly close to the rear end plate to form an electron beam welded structural joint, the protruding height of the welding lock bottom step is 0.5mm, the tolerance is -0.1 to 0mm, and the tolerance of the outer circle of the lock bottom step is 0 to 0.1mm; the electron beam welded structural joint of the core assembly close to the front end plate is the same; Step 4: Machining the rear end cap to form an electron beam welded structural joint, the welding lock bottom depression depth is 0.5 mm, the tolerance is 0-0.1 mm; the outer circle tolerance of the lock bottom step is -0.1-0 mm; the electron beam welded structural joint of the front end cap is of the same form; Step 5: butt-joint the electron beam welded structural joint of the core assembly near the rear end plate with the electron beam welded structural joint of the rear end head, and fix them by spot welding; the electron beam welded structural joint of the core assembly near the front end plate and the electron beam welded structural joint of the front end head are assembled and fixed in the same way; Step 6: Electron beam welding the electron beam welding structural joint of the core assembly near the rear end plate and the rear end head to form an electron beam welding structural joint; the electron beam welding structural joint of the core assembly near the front end plate is welded in the same manner as the electron beam welding structural joint of the front end head.

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