Pressure test tool for corner hole metal bushing ring of clamping plate in plate heat exchanger

Abstract

The invention provides a pressure test tool for corner hole metal bushing rings of a clamping plate in a plate heat exchanger, the plate heat exchanger comprises the clamping plate, four corner holes are arranged on the clamping plate, metal bushing rings are arranged on the inner sides of the corner holes, and two ends of each metal bushing ring are welded on the clamping plate corresponding to the positions of the corner holes. The tool comprises a pressing tool, a metal hose and an air compressor. The pressing tool is connected with the metal bushing ring to be tested; the pressing tool is communicated with an air compressor through a metal hose; according to the corner hole metal bushing ring pressure test tool for the clamping plate in the plate heat exchanger, a bushing ring pressure bearing capacity test can be carried out on a metal bushing ring welded on the clamping plate in advance, the detection efficiency of the bushing ring is improved, weld defects are exposed as early as possible, corresponding treatment is carried out in time, and the working efficiency is improved. And the waste of manpower and material resources caused by later reworking due to quality problems after an experiment is carried out on the heat exchanger is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of detachable plate heat exchangers, in particular to a pressure test tool for a corner hole metal liner ring of a clamping plate in a plate heat exchanger. Background Art

[0002] Plate heat exchangers feature high heat transfer efficiency, compact and lightweight structure, wide application, and easy maintenance. They are widely used in metallurgy, mining, petroleum, chemical industry, electric power, medicine, food, chemical fiber, papermaking, textile, shipbuilding, and heating. A large number of power machinery and equipment require lubricating oil cooling, which requires plate oil coolers. The efficient and stable operation of plate oil coolers is an important guarantee for the safety and stability of power machinery and equipment.

[0003] In order to prevent the lubricating oil from being contaminated by paint or rust at the interface of the plate heat exchanger clamping plate, it is generally required to install a liner ring at the interface of the clamping plate to isolate the contact between the fluid in the heat exchanger and the clamping plate. Usually, the rubber liner ring is easy to install and disassemble, but its lifespan is generally only 2-3 years. In particular, the rubber liner ring is prone to cracking and causing fluid leakage in the later stage of use. Therefore, many customers have requested the installation of metal liner rings at the interface of the clamping plate. Common materials for metal liner rings include 304, 316L, etc. The use of metal liner rings can take into account the user's requirements for the function of the metal liner ring and the demand for durability. However, in the field of shipbuilding and offshore engineering, lubricating oil coolers often use seawater to directly cool the lubricating oil, and the requirements for the heat exchanger's resistance to seawater corrosion are relatively high. The metal liner ring is often made of TA1 material, which often faces the problem of greater welding difficulty.

[0004] In fact, the metal liner ring is made by cutting, rolling, and welding 1mm thick metal sheets, which is a relatively complicated preparation process. Especially the welding of corners is difficult due to the thin metal sheets, and welding defects often occur. During long-term operation, cracks are easily formed at the welds due to fluid erosion, leading to fluid leakage. In addition, ultrasonic testing and radiographic testing are difficult to perform at the corner welds of the metal liner ring. The commonly used detection method is penetrant dye testing, but it has major shortcomings and is difficult to verify the strength of the metal liner ring welds. The following problem often occurs: After the plate heat exchanger is assembled, a water pressure test is performed, and the metal liner ring cracks due to pressure and leaks occur. The heat exchanger needs to be disassembled to find the leaking point of the metal liner ring, and the metal liner ring needs to be repaired and welded, or even the old liner ring needs to be removed and welded with a new one. The amount of rework is large, resulting in a huge waste of work time. Therefore, one of the urgent issues to be solved is how to conduct a pre-test on the pressure bearing capacity of the metal liner ring after it is welded on the clamping plate, so as to expose the weld defects early and avoid the waste of manpower and material resources caused by rework due to quality problems after the test is installed on the heat exchanger.

[0005] In patent CN219977703U, a weld quality detection tooling is mentioned, including: a detection installation hole, with at least one provided at different positions of the weld of the workpiece to be detected; a bolt, with an air inlet blind hole axially opened at the nut end thereof, and at least one exhaust through hole communicating with the air inlet blind hole provided on the side wall of the bolt; an air injection nozzle, with its outer surface hermetically sealed with the inner surface of the air inlet blind hole, and the air injection nozzle injects air towards the weld through the air inlet blind hole and the exhaust through hole; a nut, used to fasten the bolt to the workpiece to be detected where the detection installation hole is located. The weld quality detection tooling structure that can be provided is simple in structure and disassembly, without the need for assembly with the workpiece to be detected after hoisting, nor the need for fixed-point disassembly, transfer of the detection tooling back and forth between multiple workpieces to be detected. However, since this tooling needs to be provided with at least one detection installation hole at different positions of the weld of the workpiece to be detected for facilitating the detection of the weld quality of the workpiece, it is easy to increase redundant installation holes, which is not conducive to the pre-pressure test of the metal liner ring after welding. And when it is applied to the pressure test detection of the metal liner ring after welding, it is easy to face the problem of low detection efficiency. Summary of the Invention

[0006] In view of this, the present invention aims to propose a pressure test tooling for the corner hole metal liner ring of the clamping plate in a plate heat exchanger to solve the problems existing in the prior art that the welding of the metal liner ring is difficult, resulting in cracks and leakage of the metal liner ring due to pressure during the hydrostatic test after the metal liner ring is installed on the clamping plate and assembled with the plate heat exchanger, and relatively cumbersome operations such as leak detection and replacement of the new liner ring are required, resulting in a large amount of rework and serious waste of working hours; thereby achieving the ability to simplify the structure of the tooling, pre-perform the pressure-bearing capacity test of the liner ring for the metal liner ring welded on the clamping plate, improve the detection efficiency of the liner ring, enhance the accuracy of the detection of the liner ring quality, achieve early exposure of weld defects, timely carry out corresponding treatments, avoid waste of manpower and material resources caused by later rework due to quality problems after installation on the heat exchanger for experiments; and is conducive to saving the preparation period of the heat exchanger.

[0007] To achieve the above object, the technical solution of the present invention is realized as follows:

[0008] A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to the present invention. The plate heat exchanger includes a clamping plate, on which four corner holes are provided. A metal lining ring is arranged inside the corner holes, and both ends of the metal lining ring are welded to the positions corresponding to the corner holes on the clamping plate. The tooling includes a pressure testing tooling, a metal hose, and an air compressor. The pressure testing tooling is connected to the metal lining ring to be tested on the clamping plate. The pressure testing tooling is communicated with the air compressor through the metal hose. Under the action of the air compressor, the metal lining ring welded on the clamping plate can be subjected to a pressure test in sequence through the metal hose and the pressure testing tooling, so as to facilitate the pre-detection of the quality of the metal lining ring welded on the clamping plate.

[0009] Furthermore, the pressure testing tooling includes a base, a sealing ring, a pressing disc, a gasket, and a nut. One end of the base is connected to a wrench, and the other end of the base is attached to the bottom end of the metal lining ring. The other end of the base sequentially passes through the inner hole of the metal lining ring, the through hole of the pressing disc, and the inner hole of the gasket, and then is connected to the inner side wall of the nut. The bottom end of the pressing disc is attached to the top of the metal lining ring. Sealing rings are respectively arranged between the metal lining ring and the base, between the metal lining ring and the pressing disc, and between the base and the pressing disc.

[0010] Furthermore, the base includes a boss, a disc, and a round bar. One end of the boss is connected to the round bar through the disc. The other end of the boss is connected to the wrench, and the other end of the round bar sequentially passes through the inner hole of the metal lining ring, the through hole of the pressing disc, and the gasket, and then is threadedly connected to the nut.

[0011] Furthermore, the shape of the boss is prismatic.

[0012] Furthermore, the base also includes a first sealing groove and a second sealing groove. Both the first sealing groove and the second sealing groove are arranged on the top of the disc, and the first sealing groove and the second sealing groove are respectively attached to the metal lining ring through sealing rings.

[0013] Furthermore, the first sealing groove and the second sealing groove are concentrically arranged; the diameter of the first sealing groove is larger than that of the second sealing groove.

[0014] Furthermore, the base also includes a third sealing groove and a fourth sealing groove. Both the third sealing groove and the fourth sealing groove are arranged on the outer side wall bottom end of the round bar; the third sealing groove and the fourth sealing groove are respectively attached to the inner side wall of the pressing disc through sealing rings.

[0015] Furthermore, the base also includes a first channel and a second channel. Both the first channel and the second channel are arranged inside the round bar; one end of the first channel is communicated with one end of the second channel, the other end of the first channel penetrates through the outer side wall bottom end of the round bar, and the other end of the second channel penetrates through the top end of the round bar.

[0016] Furthermore, a closed cavity is formed between the base, the sealing ring, the pressing disc and the metal lining ring, and one end of the first channel far from the second channel is communicated with the cavity.

[0017] Furthermore, an external thread is provided on the outer side wall of the top end of the round bar. A step is formed between the bottom end of the external thread and the round bar, and there is a certain gap between the top of the step and the bottom of the gasket.

[0018] Compared with the prior art, the pressure test tooling for the corner hole metal lining ring of the clamping plate in the plate heat exchanger of the present invention has the following beneficial effects:

[0019] Through the setting of the tooling, the structure of the tooling can be simplified, the cost of the tooling can be reduced, the pressure bearing capacity test of the metal lining ring can be pre-conducted on the lining ring after welding on the clamping plate, the detection efficiency of the lining ring can be improved, the accuracy of the detection of the quality of the lining ring can be enhanced, the weld defects can be exposed early, corresponding treatment can be carried out in time, and the waste of manpower and material resources caused by rework in the later stage due to quality problems after installation on the heat exchanger for experiments can be avoided; it is beneficial to save the preparation period of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 It is a schematic structural diagram of the fixed clamping plate of the plate heat exchanger with metal lining rings installed in all 4 corner holes;

[0022] Figure 2 It is a schematic structural diagram of the connection between the corner hole of the clamping plate of the plate heat exchanger and the tooling;

[0023] Figure 3 It is a schematic explosion diagram of the components included in the pressure test tooling;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of the base; [[ID=зо]]

[0025] Figure 5 It is a schematic structure diagram of the base along the direction from bottom to top;

[0026] Figure 6 It is a schematic structure diagram of the base along the direction from top to bottom;

[0027] Figure 7 It is a schematic cross-sectional structure diagram of the pressure plate;

[0028] Figure 8 It is a schematic structure diagram of the pressure plate along the direction from bottom to top;

[0029] Figure 9 It is a schematic cross-sectional structure diagram of the pressure test tooling after being assembled with the metal lining ring.

[0030] Description of the reference numerals: 1. Metal lining ring; 2. Clamping plate; 3. Pressing tooling; 31. Base; 311. Boss; 312. Disc; 313. Round bar; 3131. External thread; 3132. Step; 314. First sealing groove; 315. Second sealing groove; 316. Third sealing groove; 317. Fourth sealing groove; 318. First channel; 319. Second channel; 3191. Internal thread; 32. Sealing ring; 321. First sealing ring; 3211. First inner sealing ring; 3212. First outer sealing ring; 322. Second sealing ring; 3221. Upper second sealing ring; 3222. Lower second sealing ring; 323. Third sealing ring; 3231. Third inner sealing ring; 3232. Third outer sealing ring; 33. Pressure plate; 331. Fifth sealing groove; 332. Sixth sealing groove; 34. Gasket; 341. Large washer; 342. Small washer; 35. Nut; 4. Metal hose; 5. Air compressor; 6. Cavity; 7. Cavity space. Detailed implementation mode

[0031] In the following, the inventive concepts of the present disclosure will be described using the terms that are commonly used by those skilled in the art to convey the essence of their work to other skilled persons in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0032] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0034] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] In order to solve the problem that the welding of the metal lining ring 1 in the prior art is difficult, which causes cracks in the metal lining ring 1 due to pressure during the hydrostatic test after the metal lining ring 1 is installed on the clamping plate 2 and assembled with the plate heat exchanger, resulting in leakage. It is necessary to carry out relatively cumbersome leak detection and replacement of the new lining ring, resulting in a large amount of rework and serious waste of man-hours. This embodiment proposes a pressure test tooling for the corner hole metal lining ring of the clamping plate in the plate heat exchanger. The plate heat exchanger includes a clamping plate 2, and four corner holes are provided on the clamping plate 2 for the inlet and outlet of the fluid. A metal lining ring 1 is arranged inside the corner hole, the outer side wall of the metal lining ring 1 fits with the inner side wall of the corner hole, and both ends of the metal lining ring 1 are welded to the positions corresponding to the corner holes on the clamping plate 2. It is used to prevent the corrosion of the fluid to the plate heat exchanger and the pollution of the fluid to the heat exchanger. The tooling includes a pressure test tooling 3, a metal hose 4 and an air compressor 5. The pressure test tooling 3 is connected to the metal lining ring 1 to be tested; specifically, the pressure test tooling 3 is nested at both ends of the metal lining ring 1 to be tested on the clamping plate 2. The pressure test tooling 3 is communicated with the air compressor 5 through the metal hose 4. Under the action of the air compressor 5, the metal lining ring 1 welded on the clamping plate 2 can be subjected to a pressure test in sequence through the metal hose 4 and the pressure test tooling 3, so as to facilitate the detection of the quality of the metal lining ring 1 welded on the clamping plate 2 in advance.

[0036] Through the tooling, after the clamping plate 2 installs the metal lining ring 1, it is necessary to carry out a pressure test on the weld of the lining ring to verify the setting of the weld strength. This can effectively simplify the structure of the tooling, reduce the cost of the tooling, realize the pre-pressure bearing capacity test of the metal lining ring 1 after welding on the clamping plate 2, improve the detection efficiency of the lining ring, enhance the accuracy of the detection of the lining ring quality, realize the early exposure of weld defects, and timely carry out corresponding treatments to avoid the waste of manpower and material resources caused by rework in the later stage due to quality problems after the experiment on the heat exchanger. It is beneficial to save the preparation period of the heat exchanger.

[0037] The pressure application tooling 3 includes a base 31, a sealing ring 32, a pressure plate 33, a gasket 34, and a nut 35. One end of the base 31 is connected to a wrench, and the other end of the base 31 is attached to the bottom end of the metal lining ring 1. The other end of the base 31 sequentially passes through the inner hole of the metal lining ring 1, the through hole of the pressure plate 33, and the inner hole of the gasket 34, and then is connected to the inner side wall of the nut 35. The bottom end of the pressure plate 33 is attached to the top of the metal lining ring 1. The sealing rings 32 are respectively arranged between the metal lining ring 1 and the base 31, between the metal lining ring 1 and the pressure plate 33, and between the base 31 and the pressure plate 33. The base 31, the sealing rings 32, the pressure plate 33, the gasket 34, and the nut 35 are nested and assembled with each other to obtain the pressure application tooling 3. Among them, the nut 35 is a hexagonal nut. The sealing ring 32 is an O-ring, and the material of the sealing ring 32 is rubber. The pressure plate 33 is disc-shaped; the through hole is arranged through the center position of the pressure plate 33; the through hole is used to facilitate the passing of the base 31 through the pressure plate 33, thereby realizing the connection between the two. The through hole is a round hole. The pressure plate 33 is made of metal material to ensure the structural strength of the pressure application tooling 3.

[0038] Through the setting of each component in the pressure application tooling 3, it is beneficial to simplify the structure of the tooling, reduce the cost of the tooling, reduce the volume of the tooling, and facilitate the pressure test of the metal lining ring 1 in different angular holes on the clamping plate 2. And it is also beneficial to improve the test efficiency. Through the detachable assembly method, it is possible to facilitate the disassembly and installation of the pressure application tooling 3 before and after the test.

[0039] The base 31 includes a boss 311, a disc 312, and a round bar 313. One end of the boss 311 is connected to the round bar 313 through the disc 312; the other end of the boss 311 is connected to a wrench, and the other end of the round bar 313 sequentially passes through the inner hole of the metal lining ring 1, the through hole of the pressure plate 33, and the gasket 34, and then is threadedly connected to the nut 35. Among them, the boss 311 and the round bar 313 are respectively arranged at the bottom and top of the center position of the disc 312. The shape of the boss 311 is prismatic. In this embodiment, the boss 311 is hexagonal prismatic, which is used to facilitate the cooperation with the wrench during assembly. Under the clamping of the wrench, the tight assembly between the pressure application tooling 3 and the metal lining ring 1 is realized. The shape of the round bar 313 is cylindrical. The materials of the boss 311, the disc 312, and the round bar 313 are all metal materials. The boss 311, the disc 312, and the round bar 313 are all prepared by the method of separate machining and then integral welding to obtain the base 31.

[0040] Through the setting of the boss 311, it is beneficial to facilitate the installation and fastening of the pressure application tooling 3, and it is also beneficial to improve the convenience of installing the pressure application tooling 3. Through the combined setting of the disc 312 and the round bar 313, it is beneficial to enhance the tightness of the connection between the base 31, the metal lining ring 1, the pressure plate 33, the gasket 34, and the nut 35, and it is also beneficial to determine the installation positions of each component of the pressure application tooling 3, improve the assembly efficiency, and reduce the error during the installation process.

[0041] The base 31 further includes a first sealing groove 314 and a second sealing groove 315. Both the first sealing groove 314 and the second sealing groove 315 are provided at the top of the disc 312. The first sealing groove 314 and the second sealing groove 315 are respectively attached to the metal lining ring 1 through sealing rings 32. Among them, the first sealing groove 314 and the second sealing groove 315 are concentrically arranged. The diameter of the first sealing groove 314 is larger than that of the second sealing groove 315.

[0042] Through the settings of the first sealing groove 314 and the second sealing groove 315 on the base 31, it is beneficial to improve the connection tightness between the base 31 and the metal lining ring 1 with the cooperation of the sealing rings 32, enhance the sealing performance between the base 31 and the metal lining ring 1, and ensure the measurement accuracy of the pressure test.

[0043] The base 31 further includes a third sealing groove 316 and a fourth sealing groove 317. Both the third sealing groove 316 and the fourth sealing groove 317 are provided at the bottom end of the outer side wall of the round bar 313. The third sealing groove 316 and the fourth sealing groove 317 are respectively attached to the inner side wall of the pressure plate 33 through sealing rings 32. The third sealing groove 316 and the fourth sealing groove 317 are arranged in parallel in the direction from bottom to top. The diameter of the third sealing groove 316 is equal to that of the fourth sealing groove 317. There is a certain gap between the third sealing groove 316 and the fourth sealing groove 317.

[0044] Through the settings of the third sealing groove 316 and the fourth sealing groove 317, it is beneficial to improve the connection tightness between the base 31 and the pressure plate 33 with the cooperation of the sealing rings 32, enhance the sealing effect between the two, and strengthen the connection stability among the components in the pressure testing tooling 3. In addition, through the settings of the first sealing groove 314, the second sealing groove 315, the third sealing groove 316 and the fourth sealing groove 317 on the base 31, it is also beneficial to provide an installation space for the sealing rings 32 on the base 31 and prevent the problem of the sealing rings 32 falling off during the pressure test.

[0045] The base 31 further includes a first channel 318 and a second channel 319. Both the first channel 318 and the second channel 319 are provided in the round bar 313. One end of the first channel 318 is communicated with one end of the second channel 319. The other end of the first channel 318 penetrates through the bottom outer side wall of the round bar 313, and the other end of the second channel 319 penetrates through the top of the round bar 313. The first channel 318 is arranged in the round bar 313 along a direction parallel to the plane where the disc 312 is located, and the second channel 319 is arranged in the round bar 313 along a direction perpendicular to the plane where the disc 312 is located. The first channel 318 is provided below the third sealing groove 316; when the pressure testing tooling 3 is installed on the metal lining ring 1, a closed cavity 6 is formed between the base 31, the sealing ring 32, the pressure plate 33 and the metal lining ring 1 of the pressure testing tooling 3, and the end of the first channel 318 far from the second channel 319 is communicated with the cavity 6.

[0046] Through the settings of the first channel 318 and the second channel 319, channels can be provided for the inflow and outflow of fluids or compressed gases in the pressure test, and the two are arranged on the round bar 313, which is beneficial to improving the structural stability of the pressure testing tool 3 during the pressure test and reducing the impact of the pressure test fluid on the pressure testing tool 3.

[0047] In addition, an internal thread 3191 is provided on the inner side wall of the top end of the second channel 319, and the internal thread 3191 is threadedly connected to one end of the metal hose 4 far from the air compressor 5, which is used to improve the connection stability and tightness between the metal hose 4 and the pressure testing tool 3. An external thread 3131 is provided on the outer side wall of the top end of the round bar 313, which is used to facilitate the threaded connection between the base 31 and the round bar 313 and the nut 35. Among them, the height H1 of the external thread 3131 is greater than the height H2 of the internal thread 3191. The diameter of the bottom end of the round bar 313 > the diameter of the external thread 3131 > the outer diameter of the internal thread 3191. The inner diameter of the internal thread 3191 = the diameter of the first channel 318 = the diameter of the second channel 319. A step 3132 is formed between the bottom end of the external thread 3131 and the round bar 313, and the top of the step 3132 fits with the bottom of the gasket 34 or has a certain gap. In this embodiment, the units of H1 and H2 are both mm, and the values of H1 and H2 are set as required.

[0048] Through the setting of the step 3132 between the external thread 3131 and the round bar 313, it is beneficial to provide support for the gasket 34 and can also form a certain space between the gasket 34, the pressure plate 33, and the round bar 313, which is convenient for stress dispersion and reduces stress concentration.

[0049] The pressure plate 33 includes a sealing five-groove 331 and a sealing six-groove 332. The sealing five-groove 331 and the sealing six-groove 332 are both arranged at the bottom of the pressure plate 33; the sealing five-groove 331 and the sealing six-groove 332 are respectively attached to the metal lining ring 1 through the sealing ring 32. The sealing five-groove 331 and the sealing six-groove 332 are concentrically arranged. The diameter of the sealing five-groove 331 is greater than the diameter of the sealing six-groove 332.

[0050] Through the settings of the sealing five-groove 331 and the sealing six-groove 332, it is beneficial to improve the tightness of the connection between the pressure plate 33 and the metal lining ring 1 with the cooperation of the sealing ring 32. Through the setting of the double-sealing structure, it is beneficial to enhance the sealing effect between the pressure plate 33 and the metal lining ring 1, and it can also provide an installation space for the sealing ring 32 on the pressure plate 33 to prevent the problem of the sealing ring 32 falling off during the pressure test.

[0051] The sealing ring 32 includes a first sealing ring 321, a second sealing ring 322, and a third sealing ring 323. The first sealing ring 321 is disposed between the top of the base 31 and the bottom of the metal lining ring 1. The second sealing ring 322 is disposed between the outer sidewall of the round bar 313 of the base 31 and the inner sidewall of the through hole of the pressure plate 33. The third sealing ring 323 is disposed between the top of the metal lining ring 1 and the bottom of the pressure plate 33. Specifically, the first sealing ring 321 includes a first inner sealing ring 3211 and a first outer sealing ring 3212. The first inner sealing ring 3211 is disposed in the second sealing groove 315, and the first outer sealing ring 3212 is disposed in the first sealing groove 314. The second sealing ring 322 includes a second upper sealing ring 3221 and a second lower sealing ring 3222. The second upper sealing ring 3221 is disposed in the fourth sealing groove 317, and the second lower sealing ring 3222 is disposed in the third sealing groove 316. The third sealing ring 323 includes a third inner sealing ring 3231 and a third outer sealing ring 3232. The third inner sealing ring 3231 is disposed in the sixth sealing groove 332, and the third outer sealing ring 3232 is disposed in the fifth sealing groove 331.

[0052] By arranging the respective sealing rings 32 at different positions in the pressure testing tool 3, the sealing effect between the pressure testing tool 3 and the metal lining ring 1 can be effectively enhanced, which is also conducive to enhancing the accuracy of the pressure test results, improving the stability and safety of the pressure test, and ensuring the reliability of the pressure testing tool 3 during the pressure test.

[0053] The gasket 34 includes a large washer 341 and a small washer 342. The inner sidewalls of the large washer 341 and the small washer 342 are sequentially disposed on the outer sidewall of the round bar 313 of the base 31 in the upward direction. The large washer 341 and the small washer 342 are arranged in parallel. After the assembly between the pressure testing tool 3 and the metal lining ring 1, the top of the large washer 341 is in contact with the bottom of the small washer 342, the bottom of the large washer 341 is in contact with the top of the pressure plate 33, and the top of the small washer 342 is in contact with the bottom of the nut 35. A cavity 7 is formed among the step 3132, the pressure plate 33, and the large washer 341. The cavity 7 is used to prevent stress concentration, facilitate stress dispersion, reduce the buffer caused by dynamic loads, and achieve the effect of thermal expansion compensation, preventing deformation or cracking of the pressure testing tool 3.

[0054] By the combined setting of the large washer 341 and the small washer 342, it is beneficial to improve the fastening degree of the connection between the nut 35 and the pressure plate 33 and the round bar 313 respectively, prevent the occurrence of the phenomenon that the nut 35 slips due to pressure impact during the pressure test, and improve the stability and reliability of the pressure testing tool 3.

[0055] The assembly method between the pressure testing tool 3 and the metal lining ring 1:

[0056] When assembling the pressure testing tooling 3, first horizontally place the clamping plate 2 on the bracket; install the O-ring rubber seal 32 in the grooves on the base 31, namely the first sealing groove 314 and the second sealing groove 315, and in the grooves of the round bar 313, namely the third sealing groove 316 and the fourth sealing groove 317. Then pass the base 31 through the central part of the metal liner 1 and closely adhere to the lower surface of the metal liner 1; install the O-ring rubber seal 32 in the grooves of the pressure plate 33, namely the fifth sealing groove 331 and the sixth sealing groove 332. Place the side of the pressure plate 33 where the O-ring rubber seal 32 is installed horizontally downward, pass through the external thread 3131, and closely adhere to the upper surface of the metal liner 1; sequentially pass the large washer 341 and the small washer 342 through the external thread 3131; screw the hexagon nut 35 onto the external thread 3131; use a wrench to hold the hexagonal clamping boss 311 stationary, and use a wrench to gradually tighten the hexagon nut 35 one turn at a time. In the tightened state, the O-ring rubber seal 32 ensures the airtightness of the pressure testing cavity 6; and the double-seal design with 2 O-ring rubber seals 32 is adopted at each surface contact position of the pressure testing tooling 3 in this application, which can effectively enhance the sealing effect of the tooling.

[0057] Next, connect one end of the metal hose 4 to the air compressor 5 and the other end to the internal thread 3191, start pressurizing, and the pressure in the cavity 6 formed by the metal liner 1 and the pressure testing tooling 3 gradually rises to the specified test pressure and holds for 30 minutes to verify the pressure-bearing strength of the weld of the metal liner 1.

[0058] Through the pressure testing tooling for the corner holes of the metal liner 1 of the clamping plate 2 of the plate heat exchanger in this application, the pressure-bearing capacity test of the weld of the liner can be carried out after the metal liner 1 is welded, avoiding the waste of working hours such as repeated disassembly and assembly of the whole machine caused by defects of the metal liner 1.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger. The plate heat exchanger includes a clamping plate (2), and four corner holes are provided on the clamping plate (2). It is characterized in that, A metal lining ring (1) is arranged inside the angular hole. The two ends of the metal lining ring (1) are welded to the positions corresponding to the angular holes on the clamping plate (2). The tooling includes a pressure testing tooling (3), a metal hose (4), and an air compressor (5); the pressure testing tooling (3) is connected to the metal lining ring (1) to be tested; the pressure testing tooling (3) is communicated with the air compressor (5) through the metal hose (4); under the action of the air compressor (5), the metal lining ring (1) welded on the clamping plate (2) can be subjected to a pressure test in sequence through the metal hose (4) and the pressure testing tooling (3), so as to detect the quality of the metal lining ring (1) welded on the clamping plate (2) in advance.

2. The pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 1, characterized in that, The pressure testing tooling (3) includes a base (31), a sealing ring (32), a pressure plate (33), a gasket (34), and a nut (35); one end of the base (31) is connected to a wrench, the other end of the base (31) is attached to the bottom end of the metal lining ring (1), and the other end of the base (31) passes through the inner hole of the metal lining ring (1), the through hole of the pressure plate (33), and the inner hole of the gasket (34) in sequence and is connected to the inner side wall of the nut (35); the bottom end of the pressure plate (33) is attached to the top of the metal lining ring (1); the sealing rings (32) are respectively arranged between the metal lining ring (1) and the base (31), between the metal lining ring (1) and the pressure plate (33), and between the base (31) and the pressure plate (33).

3. A pressure test tooling for the angular hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 2, characterized in that, The base (31) includes a boss (311), a disc (312), and a round bar (313); one end of the boss (311) is connected to one end of the round bar (313) through the disc (312); the other end of the boss (311) is connected to a wrench, and the other end of the round bar (313) passes through the inner hole of the metal lining ring (1), the through hole of the pressure plate (33), and the gasket (34) in sequence and is threadedly connected to the nut (35).

4. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 3, characterized in that, The shape of the boss (311) is prismatic.

5. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 3, characterized in that, The base (31) further includes a first sealing groove (314) and a second sealing groove (315); both the first sealing groove (314) and the second sealing groove (315) are arranged on the top of the disc (312), and the first sealing groove (314) and the second sealing groove (315) are respectively attached to the metal lining ring (1) through the sealing ring (32).

6. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 5, characterized in that, The first sealing groove (314) and the second sealing groove (315) are concentrically arranged; the diameter of the first sealing groove (314) is larger than the diameter of the second sealing groove (315).

7. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 3, characterized in that, The base (31) further includes a third sealing groove (316) and a fourth sealing groove (317); both the third sealing groove (316) and the fourth sealing groove (317) are arranged at the bottom end of the outer side wall of the round bar (313); the third sealing groove (316) and the fourth sealing groove (317) are respectively attached to the inner side wall of the pressure plate (33) through the sealing ring (32).

8. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 3, characterized in that, The base (31) further includes a first channel (318) and a second channel (319); both the first channel (318) and the second channel (319) are provided in the round bar (313); one end of the first channel (318) communicates with one end of the second channel (319), the other end of the first channel (318) penetrates through the outer wall of the bottom end of the round bar (313), and the other end of the second channel (319) penetrates through the top end of the round bar (313).

9. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 8, characterized in that, A closed cavity (6) is formed between the base (31), the sealing ring (32), the pressure plate (33) and the metal lining ring (1), and the end of the first channel (318) away from the second channel (319) communicates with the cavity (6).

10. A pressure test tooling for the corner hole metal lining ring of the clamping plate inside a plate heat exchanger according to claim 8, characterized in that, External threads (3131) are provided on the outer wall of the top end of the round bar (313), a step (3132) is formed between the bottom end of the external threads (3131) and the round bar (313), and there is a certain gap between the top of the step (3132) and the bottom of the gasket (34).

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