Large plate heat exchanger hydrostatic test tool and manufacturing method thereof

Abstract

The invention provides a hydraulic pressure test tool for a large plate heat exchanger and a manufacturing method of the hydraulic pressure test tool. The hydraulic pressure test tool comprises an exhaust tool A, a drainage tool B and screw holes, the exhaust tool A and the drainage tool B are detachably arranged at an upper side connector and a lower side connector of a front end plate of the plate heat exchanger respectively, the screw holes are formed in the top ends of the exhaust tool A and the drainage tool B respectively, and the hanging rings are installed in the screw holes. According to the hydraulic test tool for the large plate heat exchanger and the manufacturing method of the hydraulic test tool, the structural arrangement of the tool can be effectively optimized, the exhaust and drainage sufficiency of the tool before and after a hydraulic test is improved, and then the accuracy of a hydraulic test result is improved, the quality stability of a product is improved, and the satisfaction degree of customers is increased. In addition, through the arrangement of the tool structure, the safety and efficiency of hoisting and transferring can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrostatic test tooling for plate heat exchangers, and more specifically, to a hydrostatic test tooling for large plate heat exchangers and a manufacturing method thereof. Background Art

[0002] A heat exchanger is an energy-saving device that realizes heat transfer between two or more fluids at different temperatures. It enables heat to be transferred from a fluid at a higher temperature to a fluid at a lower temperature, so that the fluid temperature reaches the index required by the system to meet the needs of process conditions. It is also one of the main devices for improving energy utilization efficiency. A plate heat exchanger is a highly efficient heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between the front and rear plates, and heat exchange is carried out through the plates.

[0003] During the manufacturing and use of large plate heat exchangers, strict hydrostatic tests are required to ensure their sealing performance and pressure-bearing capacity. The traditional hydrostatic test tooling is modified using two blind flanges. Circular holes are machined at the center of the blind flanges. A 100-mm-long 4′ pipe is welded on the non-sealing surface side of the flange. The outer end of the pipe has about 10 mm of threads. After installing a union on one of them, it is used to connect and install a pressure gauge and a valve, which is installed at the upper interface of the plate heat exchanger during the hydrostatic test, and the exhaust is regulated through the valve; after installing a valve on the other one, it is connected to a union, which is installed at the lower interface of the plate heat exchanger during the hydrostatic test and connected to the water source for the hydrostatic test. The water inlet, pressure boosting, and drainage are regulated through the valve.

[0004] Since the interface size of large plate heat exchangers is large, and the pipes and valves connected by the hydrostatic test tooling are located at the center of the flange, the upper tooling is much lower than the highest point of the actual channel of the plate heat exchanger. It is easy to have insufficient exhaust during the exhaust before the hydrostatic test, resulting in gas in the plate heat exchanger during the hydrostatic test process, which affects the determination of the hydrostatic test results; the lower tooling is much lower than the lowest point of the actual channel of the plate heat exchanger, and the drainage after the hydrostatic test is not thorough, resulting in residual water inside the plate heat exchanger when it is shipped, which causes inconvenience to the customer during use or dissatisfaction of the customer. Moreover, the flange of the large plate heat exchanger is large in both volume and weight, and there are safety hazards and low efficiency when manually handling and installing it. Therefore, it is of great significance to study how to optimize the structural settings of large plate heat exchangers, improve the accuracy of the determination of hydrostatic test results, and enhance the safety and efficiency of manual handling.

[0005] In patent CN205843896U, a tooling for hydrostatic test of tube heads of a floating head heat exchanger is disclosed, which includes a floating tube sheet, a shell flange and a tooling flange. A connecting stop is provided on the shell flange, and the tooling flange is provided with a clamping groove matching the connecting stop. A gasket is arranged between the shell flange and the tooling flange. A sealing ring groove is arranged on the inner hole of the tooling flange. The floating tube sheet is arranged in the inner hole of the tooling flange, and the outer circle of the floating tube sheet is adapted to the sealing ring groove. An O-ring and packing are arranged in the sealing ring groove, and a pressing ring pressing in the ring groove is arranged on the end face of the sealing ring groove. Studs are arranged on the outer end face of the tooling flange, and the pressing ring is fixed on the tooling flange through nuts and studs. Through the setting of the device, the quality of the floating head heat exchanger can be effectively improved. However, due to the problems that the packing is not well wound and leakage is likely to occur, and the pressure it can bear is relatively low in this structure, it cannot solve the problem of how to optimize the structure of the plate heat exchanger and improve the accuracy of the results in the hydrostatic test. Summary of the Invention

[0006] In view of this, the present invention aims to propose a hydrostatic test tooling for a large plate heat exchanger and its manufacturing method to solve the problems existing in the prior art. On the one hand, due to the limitation of the traditional hydrostatic test tooling, which is to process a round hole in the center of the blind flange and combine with a welded pipe to cooperate with the relevant hydrostatic test device to realize the hydrostatic test, it is easy for a relatively large plate heat exchanger to have insufficient exhaust before the hydrostatic test, resulting in low accuracy of the hydrostatic test results, and incomplete drainage after the hydrostatic test, resulting in retained water inside the heat exchanger, affecting the convenience of customer use. On the other hand, the flange of the large plate heat exchanger is large in volume and weight, and the safety and efficiency of manual handling and installation are relatively low. Thus, it can effectively optimize the structure setting of the tooling, improve the sufficiency of exhaust and drainage before and after the hydrostatic test of the tooling, and then improve the accuracy of the hydrostatic test results, enhance the quality stability of the product, and increase customer satisfaction. In addition, through the setting of the tooling structure, the safety and efficiency of hoisting and transportation can also be increased.

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

[0008] A hydrostatic test tooling for a large plate heat exchanger and its manufacturing method according to the present invention. The hydrostatic test tooling for a large plate heat exchanger includes an exhaust tooling A, a drainage tooling B and threaded holes. The exhaust tooling A and the drainage tooling B are respectively arranged at the upper and lower interfaces of the front end plate of the plate heat exchanger in a detachable manner. The threaded holes are respectively processed and arranged at the tops of the exhaust tooling A and the drainage tooling B, and lifting rings are installed in the threaded holes.

[0009] Further, the exhaust tooling A includes a first blind flange, a first branch pipe, and a second branch pipe; the rear side of the first blind flange is connected to the upper front interface of the front end plate, and one ends of the first branch pipe and the second branch pipe are both arranged on the front side of the first blind flange; the other end of the first branch pipe is respectively connected to a pressure gauge and a gas shut-off valve through a first union; the other end of the second branch pipe is connected to one end of an exhaust valve through a second union, and the other end of the exhaust valve is connected to an exhaust pipe.

[0010] Further, the end of the exhaust pipe away from the exhaust valve is bent in the direction from bottom to top.

[0011] Further, the first blind flange includes a first central hole and a first circular hole; the first central hole, the first circular hole, and the threaded hole are all machined on the first blind flange, and the centers of the first central hole and the first circular hole are both arranged on the straight line C; the threaded hole is machined on the outer side wall of the top of the first blind flange, and the setting position of the threaded hole is behind the straight line C.

[0012] Further, the first central hole is machined at the position where the center of the first blind flange is located, and the center of the first circular hole is L1 mm away from the center of the first blind flange, and L1 is a positive number.

[0013] Further, L1 = (D - 17) / 2, where D is the diameter of the interface of the plate heat exchanger.

[0014] Further, the end of the first branch pipe close to the first blind flange is communicated with the first central hole; the end of the second branch pipe close to the first blind flange is communicated with the first circular hole.

[0015] Further, the drainage tooling B includes a second blind flange, a third branch pipe, and a fourth branch pipe; the rear side of the second blind flange is connected to the lower front interface of the front end plate, and one ends of the third branch pipe and the fourth branch pipe are both arranged on the front side of the second blind flange; the other end of the third branch pipe is connected to one end of a third union through a water flow shut-off valve; the other end of the third union is communicated with a water pipe; the other end of the fourth branch pipe is communicated with one end of a drain valve through a fourth union, and the other end of the drain valve is connected to a drain pipe.

[0016] Further, the second blind flange further includes a second central hole and a second circular hole; the second central hole, the second circular hole, and the threaded hole are all machined on the second blind flange, and the centers of the second central hole and the second circular hole are both arranged on the straight line C; the threaded hole is machined on the outer side wall of the top of the second blind flange, and the setting position of the threaded hole is behind the straight line C.

[0017] A manufacturing method of a hydraulic test tooling for a large plate heat exchanger, the method is applied to manufacture the hydraulic test tooling for a large plate heat exchanger as described above, and the method includes the following steps:

[0018] Step 1. Blind flange pretreatment: Punch holes and weld pipes on the first blind flange in the exhaust tooling A and the second blind flange in the drainage tooling B respectively;

[0019] Step 2. Fabrication of the exhaust tooling A: Install the water shut-off valve, the first union joint, and the second union joint at the positions corresponding to the first branch pipe and the second branch pipe on the first blind flange respectively; and during the hydrostatic test, install the first blind flange on the upper interface of the plate heat exchanger. After installation, the second branch pipe is directly above the first branch pipe;

[0020] Step 3. Fabrication of the drainage tooling B: Install the third union joint and the fourth union joint at the positions corresponding to the third branch pipe and the fourth branch pipe on the second blind flange respectively; and during the hydrostatic test, install the second blind flange on the lower interface of the plate heat exchanger. After installation, the fourth branch pipe is directly below the third branch pipe;

[0021] Step 4. Machining of the threaded holes: Machine threaded holes on the outer side walls of the tops of the first blind flange and the second blind flange respectively, and connect the lifting rings to the threaded holes in a detachable manner.

[0022] Compared with the prior art, the hydrostatic test tooling for a large plate heat exchanger and its manufacturing method of the present invention have the following beneficial effects:

[0023] Through the setting of the tooling, the structural setting of the tooling can be effectively optimized, the sufficiency of exhaust and drainage before and after the hydrostatic test of the tooling can be improved, thereby improving the accuracy of the hydrostatic test results, enhancing the quality stability of the product, and increasing customer satisfaction. In addition, through the setting of the tooling structure, the safety and efficiency of hoisting and transporting can also be increased. Through the setting of the method, the preparation efficiency of the tooling can be improved, the accuracy and reliability of tooling preparation can be enhanced, the quality of tooling preparation can be guaranteed, and the cost of tooling preparation can be reduced. Specifically, through the setting of the tooling and the method, it is possible to achieve easy, fast, and convenient transfer, disassembly, and assembly of the tooling during the hydrostatic test of a large plate heat exchanger; it is possible to fully exhaust air during the water injection of the hydrostatic test, avoiding insufficient exhaust, resulting in gas in the plate heat exchanger during the hydrostatic test process and affecting the determination of the hydrostatic test results; it is possible to completely drain water after the hydrostatic test, preventing residual water inside the plate heat exchanger during shipment, mixing with the customer's use medium and causing pollution to affect the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 It is a schematic structural diagram of the exhaust tooling A from the first perspective;

[0026] Figure 2 It is a schematic structural diagram of the exhaust tooling A from the second perspective;

[0027] Figure 3 It is a schematic structural diagram of the exhaust tooling A from the third perspective;

[0028] Figure 4 It is a schematic structural diagram of the drainage tooling B from the first perspective;

[0029] Figure 5 It is a schematic structural diagram of the drainage tooling B from the second perspective;

[0030] Figure 6 It is a schematic structural diagram of the drainage tooling B from the third perspective;

[0031] Figure 7 It is a schematic overall structure diagram after the tooling is assembled with the plate heat exchanger;

[0032] Figure 8 It is a schematic diagram of a partial enlarged view at position D in the overall structure after the tooling is assembled with the plate heat exchanger;

[0033] Figure 9 It is a schematic diagram of a partial enlarged view at position E in the overall structure after the tooling is assembled with the plate heat exchanger.

[0034] Explanation of reference numerals: 1. First blind flange; 11. First union; 12. Pressure gauge; 13. Gas shut-off valve; 14. Exhaust valve; 15. Bend; 16. First central hole; 17. First round hole; 18. Second union; 2. First branch pipe; 3. Second branch pipe; 4. Second blind flange; 41. Water flow shut-off valve; 42. Third union; 43. Fourth union; 44. Drain valve; 45. Drain pipe; 46. Second central hole; 47. Second round hole; 5. Third branch pipe; 6. Fourth branch pipe; 10. Threaded hole. Detailed implementation manners

[0035] In the following, the inventive concepts of the present disclosure will be described using the terms that are typically used by those skilled in the art to convey the substance 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 considered limited to the embodiments described herein.

[0036] 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.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 therefore should not be construed as a limitation to the present invention.

[0038] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0039] In order to solve the problems in the prior art. On the one hand, due to the setting of processing circular holes at the center of the blind flange and combining welded pipes in the traditional hydrostatic test tooling, and the cooperation with relevant hydrostatic test devices to realize the test of hydrostatic test, there are limitations. It is easy to make the exhaust of the large-sized plate heat exchanger insufficient before the hydrostatic test, resulting in a low accuracy of the hydrostatic test result, and the drainage is not thorough after the hydrostatic test, resulting in retained water inside the heat exchanger, affecting the use of customers. On the other hand, for large-sized plate heat exchanger flanges, both the volume and weight are relatively large, and the safety and efficiency of manual handling and installation are relatively low. This embodiment proposes a hydrostatic test tooling for large-sized plate heat exchangers and its manufacturing method, that is, a tooling design and manufacturing for how to fully exhaust air during the hydrostatic test process of large-sized plate heat exchangers and how to fully drain the internal moisture after the hydrostatic test. The hydrostatic test tooling for large-sized plate heat exchangers includes an exhaust tooling A, a drainage tooling B, and a threaded hole 10. The exhaust tooling A and the drainage tooling B are respectively arranged at the upper and lower interfaces of the front end plate of the plate heat exchanger in a detachable manner. The threaded holes 10 are respectively machined and arranged at the tops of the exhaust tooling A and the drainage tooling B. The lifting rings are installed in the threaded holes 10 for facilitating the lifting and transfer of the tooling.

[0040] Through the setting of the tooling, the structural setting of the tooling can be effectively optimized, the sufficiency of exhaust and drainage before and after the hydrostatic test can be improved, thereby improving the accuracy of the hydrostatic test result, enhancing the quality stability of the product, and increasing customer satisfaction. In addition, through the setting of the tooling structure, the safety and efficiency of lifting and transfer can also be increased.

[0041] The exhaust tooling A includes a first blind flange 1, a first branch pipe 2, and a second branch pipe 3. The rear side of the first blind flange 1 is connected to the upper front interface of the front end plate. One ends of the first branch pipe 2 and the second branch pipe 3 are both arranged on the front side of the first blind flange 1. The other end of the first branch pipe 2 is respectively connected to a pressure gauge 12 and a gas shut-off valve 13 through a first union 11. The other end of the second branch pipe 3 is connected to one end of an exhaust valve 14 through a second union 18, and the other end of the exhaust valve 14 is connected to an exhaust pipe. The end of the exhaust pipe away from the exhaust valve 14 is bent in the direction from bottom to top for facilitating exhaust. Among them, there is a certain gap between the first branch pipe 2 and the second branch pipe 3, and the second branch pipe 3 is arranged above the first branch pipe 2. In addition, at least one pressure gauge 12 is provided. When two pressure gauges 12 are provided, the exhaust tooling A further includes a gauge elbow 15. The two pressure gauges 12 are communicated through the gauge elbow 15. The outer side wall of the bent section of the gauge elbow 15 is attached to the outer side of the first union 11. The gas shut-off valve 13 is arranged at the end of the first union 11 away from the first branch pipe 2.

[0042] Through the settings of the first branch pipe 2 and the second branch pipe 3, it can be distinguished from the existing single-pipe setting, which is likely to cause insufficient exhaust during the hydrostatic test of the plate heat exchanger, thereby affecting the accuracy of the hydrostatic test result. This application adopts the structure of double pipes arranged on the first blind flange 1. On the one hand, it can effectively ensure that the plate heat exchanger can be fully and thoroughly exhausted before the hydrostatic test. On the other hand, it can enhance the use stability of the tooling. By separating the gas shut-off valve 13 and the exhaust valve 14, it can effectively improve the accuracy of the pressure gauge 12 test, and further improve the accuracy and reliability of the hydrostatic test result.

[0043] Among them, the first blind flange 1 includes a first central hole 16 and a first circular hole 17. The first central hole 16, the first circular hole 17, and the threaded hole 10 are all machined on the first blind flange 1. The centers of the first central hole 16 and the first circular hole 17 are both arranged on the straight line C. The threaded hole 10 is machined on the outer side wall of the top of the first blind flange 1, and the setting position of the threaded hole 10 is behind the straight line C. Specifically, the first central hole 16 is machined at the position where the center of the first blind flange 1 is located. The center of the first circular hole 17 is L1 mm away from the center of the first blind flange 1. The threaded hole 10 is machined at the highest point of the top of the first blind flange 1. In addition, the end of the first branch pipe 2 close to the first blind flange 1 is communicated with the first central hole 16. The end of the second branch pipe 3 close to the first blind flange 1 is communicated with the first circular hole 17. Among them, the value of L1 is a positive number, L1 = (D - 17) / 2, D is the diameter of the upper interface of the plate heat exchanger. Among them, the diameters of the upper and lower interfaces of the plate heat exchanger are the same, and the upper and lower interfaces on the plate heat exchanger are the corner holes of the heat exchanger.

[0044] Through the relative arrangement of the first central hole 16 and the first round hole 17, the communication between the first branch pipe 2 and the second branch pipe 3 and the inside of the plate heat exchanger can be effectively realized. In addition, by arranging the threaded hole 10 at the top end of the first blind flange 1, it is beneficial to facilitate the engagement between the outer side wall of the lifting ring and the inner side wall of the threaded hole 10. Furthermore, during the lifting process, the connection stability between the lifting ring and the threaded hole 10 can be enhanced, and the difficulty of manual handling can be reduced, and the efficiency of tooling transfer can be improved.

[0045] The drainage tooling B includes a second blind flange 4, a third branch pipe 5 and a fourth branch pipe 6. The rear side of the second blind flange 4 is connected to the lower front interface of the front end plate. One ends of the third branch pipe 5 and the fourth branch pipe 6 are both arranged on the front side of the second blind flange 4. The other end of the third branch pipe 5 is connected to one end of a water flow shut-off valve 41 through a third union 42. The other end of the third union 42 is connected to a water pipe. The other end of the fourth branch pipe 6 is connected to one end of a drain valve 44 through a fourth union 43. The other end of the drain valve 44 is connected to a drain pipe 45. The end of the drain pipe 45 away from the drain valve 44 is bent in the direction from top to bottom for facilitating drainage. Among them, there is a certain gap between the third branch pipe 5 and the fourth branch pipe 6, and the fourth branch pipe 6 is arranged below the third branch pipe 5.

[0046] Through the arrangement of the water flow shut-off valve 41 and the third union 42, the connection between the plate heat exchanger and the water source for the hydrostatic test can be realized, and the water inlet and pressure boosting can be regulated through the valve. Combining the arrangement of the fourth branch pipe 6, the fourth union 43 and the drain valve 44, the residual water can be effectively drained completely after the hydrostatic test, which is beneficial to improving the convenience of use after the user receives the goods and is more conducive to enhancing the user's satisfaction.

[0047] Among them, the second blind flange 4 further includes a second central hole 46 and a second round hole 47. The second central hole 46, the second round hole 47 and the threaded hole 10 are all machined on the second blind flange 4. The centers of the second central hole 46 and the second round hole 47 are both arranged on the straight line C. The threaded hole 10 is machined on the outer side wall at the top end of the second blind flange 4, and the position of the threaded hole 10 is behind the straight line C. Specifically, the second central hole 46 is machined at the position of the center of the second blind flange 4, and the center of the second round hole 47 is L1 mm away from the center of the second blind flange 4. The threaded hole 10 is machined at the highest point of the top end of the second blind flange 4. In addition, one end of the third branch pipe 5 close to the second blind flange 4 is communicated with the second central hole 46. One end of the fourth branch pipe 6 close to the second blind flange 4 is communicated with the second round hole 47.

[0048] Through the relative settings of the second central hole 46 and the second round hole 47, the communication between the third branch pipe 5 and the fourth branch pipe 6 and the inside of the plate heat exchanger can be effectively achieved. In addition, through the setting of the threaded hole 10 on the second blind flange 4, in cooperation with the threaded hole 10 set on the first blind flange 1, the safety of the tooling transfer during the hoisting process can be effectively improved. Through the setting of the double threaded holes 10, it is beneficial to ensure the safety of the installation personnel and also beneficial to enhance the stability of the tooling force during the hoisting process.

[0049] A manufacturing method of a hydraulic test tooling for a large plate heat exchanger, which is applied to manufacture the hydraulic test tooling for a large plate heat exchanger, and the method includes the following steps:

[0050] Step 1. Blind flange pretreatment: Punch holes and weld pipes on the first blind flange 1 in the exhaust tooling A and the second blind flange 4 in the drain tooling B respectively.

[0051] Step 2. Manufacture of the exhaust tooling A: Install the water flow cut-off valve 41, the first union 11, and the second union 18 at the positions corresponding to the first branch pipe 2 and the second branch pipe 3 on the first blind flange 1 respectively; and during the hydraulic test, install the first blind flange 1 on the upper side interface of the plate heat exchanger. After installation, the second branch pipe 3 is directly above the first branch pipe 2.

[0052] Step 3. Manufacture of the drain tooling B: Install the third union 42 and the fourth union 43 at the positions corresponding to the third branch pipe 5 and the fourth branch pipe 6 on the second blind flange 4 respectively; and during the hydraulic test, install the second blind flange 4 on the lower side interface of the plate heat exchanger. After installation, the fourth branch pipe 6 is directly below the third branch pipe 5.

[0053] Step 4. Machining of the threaded hole 10: Machine the threaded hole 10 on the outer side walls at the tops of the first blind flange 1 and the second blind flange 4 respectively, and thread-connect the lifting rings to the threaded hole 10 in a detachable manner for facilitating the hoisting and transfer of the tooling during the installation before the hydraulic test.

[0054] Among them, in Step 4, the machining positions of the threaded hole 10 are respectively on the outer side wall of the first blind flange 1 corresponding to the rear of the top of the straight line where the centers of the first central hole 16 and the first round hole 17 are located, and on the outer side wall of the second blind flange 4 corresponding to the rear of the top of the straight line where the centers of the second central hole 46 and the second round hole 47 are located. The threaded hole 10 is an M20 threaded hole. The lifting ring is an M20 lifting ring.

[0055] Through the settings of the above method, the efficiency of tooling preparation can be improved, the accuracy and reliability of tooling preparation can be enhanced, the quality of tooling preparation can be guaranteed, and the cost of tooling preparation can be reduced.

[0056] Step 1 includes:

[0057] Step S11: Select the first blind flange 1 in the exhaust tooling A adapted to the upper and lower end interfaces of the plate heat exchanger and the second blind flange 4 in the drainage tooling B respectively;

[0058] Step S12: Process a first central hole 16 and a first round hole 17 at corresponding positions on the first blind flange 1 respectively; process a second central hole 46 and a second round hole 47 at corresponding positions on the second blind flange 4 respectively; among them, the first central hole 16, the second central hole 46, the first round hole 17 and the second round hole 47 are all round holes with a diameter of 17 mm.

[0059] Step S13: Weld a first branch pipe 2 and a second branch pipe 3 at positions corresponding to the first central hole 16 and the first round hole 17 on the front side of the first blind flange 1 respectively; weld a third branch pipe 5 and a fourth branch pipe 6 at positions corresponding to the second central hole 46 and the second round hole 47 on the front side of the second blind flange 4 respectively.

[0060] Among them, in step S11, the interface specifications and nominal grades of the first blind flange 1 and the second blind flange 4 are the same as those of the plate heat exchanger interface. In step S13, the front sides of the first blind flange 1 and the second blind flange 4 are the non-sealing surface sides of the first blind flange 1 and the second blind flange 4. The first branch pipe 2, the second branch pipe 3, the third branch pipe 5 and the fourth branch pipe 6 are all hollow pipes with a length of 100 mm and a diameter of 4′, that is, DN15. And the outer ends of the pipes contain about 10 mm of left and right threads.

[0061] By selecting the first blind flange 1 and the second blind flange 4 of the required specifications and respectively punching holes and welding pipes at the corresponding positions of the blind flanges, it can effectively provide support for the subsequent installation of union joints or valves, facilitate the connection between the tooling and the corresponding hydrostatic test components, realize the quick disassembly and assembly between the tooling and the test device, and also facilitate the thorough exhaust of the blind flange before the hydrostatic test and the thorough drainage after the hydrostatic test through the setting of different hole positions on the blind flange, thereby improving the accuracy of the hydrostatic test measurement results and ensuring the reliability of the product quality inspection.

[0062] Step two includes:

[0063] Step S21: Connect the pressure gauge 12 and the gas shut-off valve 13 respectively to the end of the first branch pipe 2 away from the first blind flange 1 at the first central hole 16 of the first blind flange 1 through the first union joint 11;

[0064] Step S22: Connect the exhaust valve 14 to the end of the second branch pipe 3 away from the first blind flange 1 at the first round hole 17 of the first blind flange 1 through the second union joint 18;

[0065] Step S23: During the hydrostatic test, the first blind flange 1 is installed on the upper-side interface of the plate heat exchanger. When the second branch pipe 3 is installed, it is located directly above the first branch pipe 2 to ensure that the exhaust point is at the highest point of the corner hole of the plate heat exchanger, so as to fully exhaust air before the hydrostatic test.

[0066] Through the settings of the components in the exhaust tooling A, it is possible to achieve easy, fast, and convenient transfer, disassembly, and assembly of the tooling for the large plate heat exchanger during the hydrostatic test; it is possible to fully exhaust air during the water injection for the hydrostatic test, avoiding insufficient air exhaust, which may cause gas in the plate heat exchanger during the hydrostatic test process and affect the determination of the hydrostatic test results.

[0067] Step three includes:

[0068] Step S31: At the end of the third branch pipe 5 away from the second blind flange 4 at the second central hole 46 of the second blind flange 4, it is connected to the third union 42 through the water flow shut-off valve 41; it can achieve connection with the water source for the hydrostatic test, and regulate the water inlet and pressure through the valve.

[0069] Step S32: At the end of the fourth branch pipe 6 away from the second blind flange 4 at the second round hole 47 of the second blind flange 4, it is connected to the drain valve 44 through the fourth union 43.

[0070] Step S33: During the hydrostatic test, the second blind flange 4 is installed on the lower-side interface of the plate heat exchanger. When the fourth branch pipe 6 is installed, it is located directly below the third branch pipe 5 to ensure that the drainage point is at the lowest point of the corner hole of the plate heat exchanger, for full drainage after the hydrostatic test, and can effectively prevent excessive water flow and splashing of water when directly removing the second blind flange 4 for drainage.

[0071] Through the settings of the components in the drainage tooling B, it is possible to achieve thorough drainage after the hydrostatic test, prevent residual water inside the plate heat exchanger when it is shipped, and avoid contamination caused by mixing with the customer's use medium, which may affect the system operation.

[0072] Embodiment:

[0073] Take the hydrostatic test tooling of the P350 plate heat exchanger as an example.

[0074] Step one: Use 2 blind flanges (DN350 - PN25) with the same interface specifications and nominal grades as the P350 plate heat exchanger design. The diameter of the corner hole of the plate heat exchanger is 330 mm. Circular holes with a diameter of 17 mm are processed respectively with the center of the blind flange, i.e., the center of the circle, and the position with a distance of L1 = 156.5 mm from the center of the blind flange as the center of the circle.

[0075] And 4′ pipes with a length of 100 mm are welded respectively at the two circular holes on the non-sealing surface side, i.e., the front side of the blind flange. The outer ends of the pipes have about 10 mm threads.

[0076] Step 2. Fabrication of Exhaust Tooling A: The pipe at the center hole of the first blind flange 1 is installed with a first union 11 and then used to connect and install a pressure gauge 12 and a gas shut-off valve 13. At the first round hole 17 located 156.5 mm away from the center of the blind flange, the pipe is installed with a second union 18 and then connected to a DN15 screwed ball valve, i.e., the exhaust valve 14. When the first blind flange 1 is subjected to a hydrostatic test, it is installed at the upper interface of the plate heat exchanger. The second branch pipe 3 located 156.5 mm away from the center of the blind flange is installed directly above the first branch pipe 2 during installation, which is used to ensure that the exhaust point is at the highest point of the corner hole of the plate heat exchanger and is used to fully exhaust the air before the hydrostatic test.

[0077] Step 3. Fabrication of Drainage Tooling B: The third branch pipe 5 at the second center hole 46 of the second blind flange 4 is installed with a DN15 screwed ball valve, i.e., a water flow shut-off valve 41, and then connected to a third union 42, which can be used to connect to the water source for the hydrostatic test and regulate the water inlet and pressure through the valve. At the second round hole 47 located 156.5 mm away from the center of the blind flange, the fourth branch pipe 6 is installed with a fourth union 43 and then connected to a DN15 screwed ball valve, i.e., a drain valve 44. When the second blind flange 4 is subjected to a hydrostatic test, it is installed at the lower interface of the plate heat exchanger. The fourth branch pipe 6 located 156.5 mm away from the center of the blind flange is installed directly below the third branch pipe 5 during installation, which is used to ensure that the drainage point is at the lowest point of the corner hole of the plate heat exchanger and is used to fully drain the water after the hydrostatic test, and can effectively prevent excessive water flow and splashing caused by directly removing the blind flange for drainage.

[0078] Step 4. At the center hole of the first blind flange 1 (exhaust tooling A) and the second blind flange 4 (drainage tooling B) and above the straight line C of the round holes located 156.5 mm away from the center of the blind flange (at the highest point after installation on the plate heat exchanger), M20 threaded holes 10 are machined at the outer edges of different blind flanges; these are used to install M20 eyebolts, which are used for the hoisting and transfer of the tooling during the installation before the hydrostatic test.

[0079] 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 principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic test tooling for a large plate heat exchanger, characterized in that It includes an exhaust tooling A, a drainage tooling B and a threaded hole (10); the exhaust tooling A and the drainage tooling B are respectively arranged at the upper and lower interfaces of the front end plate of the plate heat exchanger in a detachable manner, the threaded holes (10) are respectively machined on the tops of the exhaust tooling A and the drainage tooling B, and the lifting rings are installed in the threaded holes (10).

2. The hydrostatic test tooling for a large plate heat exchanger according to claim 1, wherein, The exhaust tooling A includes a first blind flange (1), a first branch pipe (2) and a second branch pipe (3); the rear side of the first blind flange (1) is connected to the upper front interface of the front end plate, and one ends of the first branch pipe (2) and the second branch pipe (3) are both arranged on the front side of the first blind flange (1); the other end of the first branch pipe (2) is respectively connected to a pressure gauge (12) and a gas shut-off valve (13) through a first union (11); the other end of the second branch pipe (3) is connected to one end of an exhaust valve (14) through a second union (18), and the other end of the exhaust valve (14) is connected to an exhaust pipe.

3. The hydrostatic test tooling for a large plate heat exchanger according to claim 2, characterized in that, The end of the exhaust pipe far from the exhaust valve (14) is bent in the direction from bottom to top.

4. A hydrostatic test tooling for a large plate heat exchanger according to claim 2, characterized in that, The first blind flange (1) includes a first central hole (16) and a first round hole (17); the first central hole (16), the first round hole (17) and the threaded hole (10) are all machined on the first blind flange (1), and the centers of the first central hole (16) and the first round hole (17) are both arranged on a straight line C; the threaded hole (10) is machined on the outer side wall of the top of the first blind flange (1), and the setting position of the threaded hole (10) is behind the straight line C.

5. A hydraulic test tooling for a large plate heat exchanger according to claim 4, characterized in that, The first central hole (16) is machined at the position where the center of the first blind flange (1) is located, and the center of the first round hole (17) is L1 mm away from the center of the first blind flange (1), and L1 is a positive number.

6. The hydrostatic test tooling for a large plate heat exchanger according to claim 5, characterized in that, The L1 = (D - 17) / 2, where D is the diameter of the interface of the plate heat exchanger.

7. A hydraulic test tooling for a large plate heat exchanger according to claim 4, characterized in that, The end of the first branch pipe (2) close to the first blind flange (1) is communicated with the first central hole (16); the end of the second branch pipe (3) close to the first blind flange (1) is communicated with the first round hole (17).

8. A hydraulic pressure test tooling for a large plate heat exchanger according to claim 1, characterized in that, The drainage tooling B includes a second blind flange (4), a third branch pipe (5) and a fourth branch pipe (6); the rear side of the second blind flange (4) is connected to the lower front interface of the front end plate, and one ends of the third branch pipe (5) and the fourth branch pipe (6) are both arranged on the front side of the second blind flange (4); the other end of the third branch pipe (5) is connected to one end of a third union (42) through a water flow shut-off valve (41); the other end of the third union (42) is communicated with a water pipe; the other end of the fourth branch pipe (6) is communicated with one end of a drain valve (44) through a fourth union (43), and the other end of the drain valve (44) is communicated with a drain pipe (45).

9. A hydrostatic test tooling for a large plate heat exchanger according to claim 8, characterized in that, The second blind flange (4) further includes a second central hole (46) and a second round hole (47); the second central hole (46), the second round hole (47) and the threaded hole (10) are all machined on the second blind flange (4), and the centers of the second central hole (46) and the second round hole (47) are both arranged on a straight line C; the threaded hole (10) is machined on the outer side wall of the top of the second blind flange (4), and the setting position of the threaded hole (10) is behind the straight line C.

10. A manufacturing method of a hydrostatic test tooling for a large plate heat exchanger, characterized in that, The method is applied to manufacturing a hydrostatic test tooling for a large plate heat exchanger described in any one of claims 1-9, and the method comprises the following steps: Step 1, pretreatment of the blind flange: perforating and pipe welding are respectively carried out on the first blind flange (1) in the exhaust tooling A and the second blind flange (4) in the drainage tooling B; Step 2, manufacturing of the exhaust tooling A: the water flow cut-off valve (41), the first union joint (11), and the second union joint (18) are respectively installed at positions corresponding to the first branch pipe (2) and the second branch pipe (3) on the first blind flange (1); and during the hydrostatic test, the first blind flange (1) is installed at the upper side interface of the plate heat exchanger. After installation, the second branch pipe (3) is directly above the first branch pipe (2); Step 3, manufacturing of the drainage tooling B: the third union joint (42) and the fourth union joint (43) are respectively installed at positions corresponding to the third branch pipe (5) and the fourth branch pipe (6) on the second blind flange (4); and during the hydrostatic test, the second blind flange (4) is installed at the lower side interface of the plate heat exchanger. After installation, the fourth branch pipe (6) is directly below the third branch pipe (5); Step 4, machining of the threaded hole (10): threaded holes (10) are respectively machined on the outer side walls at the tops of the first blind flange (1) and the second blind flange (4), and the lifting rings are detachably connected to the threaded holes (10).

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