Non-container double-end mechanical seal test fixture

Abstract

This invention proposes a non-portable double-end mechanical seal testing fixture, comprising a mandrel, a pressure member, and a pressure sealing cover. The mandrel has a first end and a second end, with an annular positioning platform formed at the first end. The pressure member is disposed at the second end of the mandrel, and the positioning platform cooperates with the pressure member to press the mechanical seal, which is sleeved on the outer circumference of the mandrel, between the positioning platform and the pressure member, forming a chamber between the outer wall of the mandrel and the mechanical seal. The pressure sealing cover has a first interface, which is disposed on the outer circumference of the mechanical seal and communicates with the chamber through a first through hole on the mechanical seal. This invention allows for pre-pressure testing of the mechanical seal. If a leak is found, the leak location can be directly observed and confirmed, and timely replacement or repair can be performed without disassembling the pump, effectively improving production efficiency and ensuring product sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal testing, and in particular to a non-container double-end-face mechanical seal testing fixture. Background Technology

[0002] A cartridge mechanical seal refers to a mechanical seal structure formed by directly assembling mechanical seal components (such as rotating rings, stationary rings, and auxiliary sealing rings) with a container (such as shaft sleeves and glands). It is also known as a cartridge-type mechanical seal and offers advantages such as convenient and quick installation and reliable sealing. A non-cartridge mechanical seal, on the other hand, achieves sealing through sealing elements installed on the outside of the shaft. Non-cartridge mechanical seals are suitable for sealing various rotating equipment (such as centrifugal pumps, agitators, compressors, and gearboxes).

[0003] For the aforementioned non-carrier mechanical seals, the sealing components include a rotary seal structure located on the outside of the shaft and an end-face seal structure located on the end of the shaft. This sealing structure can solve the problems of shaft deviation and vibration, and can also control multiple parameters such as pressure and temperature, so that rotating equipment can still maintain a good sealing effect when rotating at high speed. Compared with carrier mechanical seals, non-carrier mechanical seals have advantages such as strong versatility, convenient installation, and easy maintenance. However, since non-carrier mechanical seals do not have a shaft sleeve, they cannot form a complete sealing cavity for pressure testing. In actual production, pressure testing can only be carried out after the shaft is assembled with the equipment (after the pump is installed). If the pressure test result is normal, the assembled product can proceed to the next process. If leakage is found during the pressure test, the pump needs to be disassembled before the rotary seal structure and end-face seal structure can be disassembled and replaced or further tested. Since the pump installation and sealing structure disassembly processes are very cumbersome, once leakage is found, the subsequent handling is not only time-consuming and labor-intensive, increasing the workload of workers, but also has a significant impact on product production efficiency.

[0004] Therefore, this utility model proposes a non-container double-end mechanical seal testing fixture to overcome the defects of the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a non-portable double-end mechanical seal testing fixture that allows for pressure testing of the mechanical seal before pump assembly, enabling the detection of its sealing performance. If a leak is found, the leak location can be directly observed and confirmed, and timely replacement or repair can be carried out without disassembling the pump, effectively improving production efficiency and ensuring the sealing effect of the product.

[0006] The above-mentioned technical objectives of this utility model are mainly achieved through the following technical solutions:

[0007] This utility model provides a non-portable double-end-face mechanical seal testing fixture for testing cylindrical mechanical seals. The non-portable double-end-face mechanical seal testing fixture includes:

[0008] A mandrel, along the axial direction of the mandrel, has a first end and a second end opposite to each other, and an annular positioning shaft platform is formed at the first end of the mandrel;

[0009] A pressing element is disposed at the second end of the mandrel. The positioning shaft table cooperates with the pressing element to press the mechanical seal sleeved on the outer periphery of the mandrel between the positioning shaft table and the pressing element, and to form a cavity between the outer wall surface of the mandrel and the mechanical seal.

[0010] A pressure sealing cover has a first interface. The pressure sealing cover is used to be disposed on the outer periphery of the mechanical seal, and the first interface is used to communicate with the chamber through a first through hole on the mechanical seal.

[0011] In a preferred embodiment of the present invention, the pressure sealing cover further has a second interface, and the second interface is used to communicate with the chamber through the second through hole on the mechanical seal;

[0012] A plug is provided at the second interface.

[0013] In a preferred embodiment of the present invention, the non-container double-end mechanical seal test fixture further includes a connector, which is disposed at the first interface and is connected to a pressure testing device via a pressure transmission pipe.

[0014] In a preferred embodiment of the present invention, the positioning shaft platform forms an annular first positioning step on the side facing the pressure member. The first positioning step is used to abut against one end of the mechanical seal, and the wall surface of the pressure member on the side facing the positioning shaft platform is used to seal against the other end of the mechanical seal.

[0015] In a preferred embodiment of the present invention, the second end of the mandrel has a connecting hole, and a fastener is provided in the connecting hole. The pressure member is fixed to the second end of the mandrel by the fastener.

[0016] In a preferred embodiment of this utility model, from the first end to the second end of the mandrel, the mandrel is sequentially formed with decreasing radii of a positioning shaft platform, a middle shaft segment, and a positioning shaft segment. The outer wall of the middle shaft segment near the positioning shaft platform is used to fit against the inner wall of the mechanical seal near the positioning shaft platform. The outer wall of the positioning shaft segment is used to fit against the inner wall of the mechanical seal near the pressure member, so as to form the cavity between the outer wall surface of the middle shaft segment and the inner wall of the mechanical seal.

[0017] In a preferred embodiment of the present invention, a second annular positioning step is formed on the side of the central shaft segment facing the positioning shaft segment, and the second positioning step is used to abut against an annular boss on the inner wall of the mechanical seal.

[0018] In a preferred embodiment of the present invention, the positioning shaft segment has a sealing groove along its circumference, and a first sealing ring is interference-fitted into the sealing groove, the first sealing ring being sealed and pressed between the sealing groove and the mechanical seal.

[0019] And / or, a second sealing ring is provided between the outer wall of the middle shaft section and the portion near the positioning shaft platform and the mechanical seal.

[0020] In a preferred embodiment of the present invention, the pressing element is a pressure plate, which cooperates with the positioning shaft to press the mechanical seal between them.

[0021] In a preferred embodiment of this utility model, the pressing element is a pressure cover, which has a cylindrical structure with one end open and the other end sealed. The pressure cover is used to cover the outside of the mechanical seal, and the inner wall of the sealed end of the pressure cover cooperates with the positioning shaft to press the mechanical seal between the two. The pressure sealing cover has an annular positioning boss, and the inner wall near the open end of the pressure cover abuts against the outer wall of the positioning boss.

[0022] Based on the above, the features and advantages of the non-container double-end mechanical seal testing fixture of this utility model are:

[0023] Based on the cylindrical structure of the mechanical seal, a non-carrier double-end mechanical seal testing fixture is designed to match it. This allows for a sealing test of the mechanical seal before pump installation. During testing, the mechanical seal is fitted onto the outer circumference of the mandrel. A pressure piece positions the mechanical seal between a positioning platform at one end of the mandrel and a pressure piece at the other end. Because a certain gap exists between the outer wall of the mandrel and the mechanical seal, a cylindrical chamber is formed between them after positioning and assembling. A pressure sealing cap is placed on the outer circumference of the mechanical seal, and the chamber is connected to an external pressure device via a first interface on the pressure sealing cap and a first through-hole on the mechanical seal. The pressure device can pressurize the chamber through the first interface and the first through-hole, and determine the presence of a leak based on the pressure within the chamber. This allows for a sealing test of the mechanical seal before pump installation. If a leak is found, replacement or repair is easier without requiring pump disassembly, effectively improving production efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0025] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0026] Figure 1 One of the structural schematic diagrams of the non-container double-end mechanical seal test fixture of this utility model in the state of sealing test;

[0027] Figure 2 The second schematic diagram shows the sealing test state of the non-container double-end mechanical seal test fixture of this utility model.

[0028] Figure 3 This is a schematic diagram of the non-containerized double-end mechanical seal testing fixture of this utility model.

[0029] The reference numerals in the accompanying drawings of this utility model are:

[0030] 1. Mandrel; 101. Positioning spindle;

[0031] 1011. First positioning step; 102. Middle axis section;

[0032] 1021. Second positioning step; 103. Positioning shaft segment;

[0033] 104. Connecting hole; 105. Sealing groove;

[0034] 2. Fasteners; 3. Pressure-sealed gland;

[0035] 301. First interface; 302. Second interface;

[0036] 303. Positioning boss; 4. Pressing element;

[0037] 401. Pressure plate; 402. Pressure cover;

[0038] 5. Connector; 6. Pressure transmission pipe;

[0039] 7. Pressure testing device; 8. Plug;

[0040] 9. Mechanical seal; 901. First rotating ring;

[0041] 902, First compensation ring; 9021, First through hole;

[0042] 9022, Second through hole; 903, Second compensation ring;

[0043] 904. Second rotating ring; 905. Spring;

[0044] 906. First rotary sealing ring; 907. Second rotary sealing ring;

[0045] 908. Third sealing ring; 909. Fourth sealing ring;

[0046] 10. Second sealing ring; 11. First sealing ring;

[0047] 12. Chamber. Detailed Implementation

[0048] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0049] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] This utility model's non-portable double-end-face mechanical seal testing fixture can be used to perform pressure tests on the mechanical seal 9 on the outer circumference of a pump shaft (such as a centrifugal pump) before installation to determine the sealing effect of the mechanical seal 9. The mechanical seal 9 is a conventional mechanical seal, which is a sealing gland assembly for the pump shaft. Figure 1 and Figure 2As shown, the mechanical seal 9 includes a first rotating ring 901, a first compensating ring 902, a second rotating ring 904, and a second compensating ring 903. The first rotating ring 901 and the first compensating ring 902 are rotatably and sealably connected to each other via a first rotating sealing ring 906. The second rotating ring 904 and the second compensating ring 903 are rotatably and sealably connected to each other via a second rotating sealing ring 907. Each of the first rotating sealing rings 906 and 907 comprises two ring bodies. One ring body of the first rotating sealing ring 906 is connected to the end of the first rotating ring 901, and the other ring body is connected to the end of the first compensating ring 902. When the mechanical seal 9 is in the assembled state, the two ring bodies can rotate relative to each other and maintain a tight fit. The first rotating sealing ring 906 ensures that, in the pump-assembled state, the first rotating ring 901 can rotate relative to the first compensating ring 902, while the first compensating ring 902 remains stationary. It also ensures that the first rotating ring 901 and the first compensating ring 902 are rotatably and sealably connected. The compensating rings 902 always maintain a tight fit; similarly, the two rings in the second rotary sealing ring 907 are connected in the same way, with one ring connected to the end of the second rotary ring 904 and the other ring connected to the end of the second compensating ring 903. When the mechanical seal 9 is in the assembled state, the two rings can rotate relative to each other and fit tightly. The second rotary sealing ring 907 ensures that the second rotary ring 904 can rotate relative to the second compensating ring 903 in the pump-mounted state, while the second compensating ring 903 is stationary, and also ensures a tight fit between the second rotary ring 904 and the second compensating ring 903.

[0052] In this design, each ring in the first rotary sealing ring 906 and the second rotary sealing ring 907 can be made of either a soft graphite sealing ring or a hard silicon carbide sealing ring; or both can be hard silicon carbide sealing rings, or both can be hard alloy sealing rings. Preferably, one is a graphite sealing ring and the other is a silicon carbide sealing ring or an alloy sealing ring. Graphite has the characteristics of being soft, with good self-lubricating properties and good adhesion, which can better ensure the tight fit between the two rings. Even when the rings rotate relative to each other for a long time, they are not easily worn, thus preventing leakage at the contact point of the rings. This ensures the stable and long-term normal operation of the first rotary sealing ring 906 and the second rotary sealing ring 907, and guarantees the stable operation of the mechanical seal 9. When the pump is installed, the first compensation ring 902 and the second compensation ring 903 can be connected to the pump box through the sealing gland. The first compensation ring 902 and the second compensation ring 903 are in a stationary state, while the first rotating ring 901 and the second rotating ring 904 are sleeved on the pump shaft. The first rotating ring 901 and the second rotating ring 904 will rotate with the pump shaft.

[0053] In addition, such as Figure 1 and Figure 2 As shown, multiple springs 905 can be provided between the first compensation ring 902 and the second compensation ring 903. The axial position between the first compensation ring 902 and the second compensation ring 903 (which is also the axial position between the first rotating ring 901 and the second rotating ring 904) can be adjusted by the springs 905. In this way, the elastic force of the springs 905 can push the rotating ring and the corresponding compensation ring to maintain a tight fit.

[0054] The structure of the non-portable single-end mechanical seal testing fixture of this utility model is described below:

[0055] like Figures 1 to 3 As shown, this utility model provides a non-portable double-end-face mechanical seal testing fixture, which is used to perform sealing tests on a cylindrical mechanical seal 9. The non-containerized double-end mechanical seal testing fixture includes a mandrel 1, a pressure member 4, and a pressure sealing cover 3. Along the axial direction of the mandrel 1, the mandrel 1 has a first end and a second end (i.e., the two ends of the mandrel 1). A circular positioning shaft platform 101 is formed at the first end of the mandrel 1. The pressure member 4 is disposed at the second end of the mandrel 1. In the sealing test state, the mechanical seal 9 is sleeved on the outer periphery of the mandrel 1, and the positioning shaft platform 101 cooperates with the pressure member 4 to press the mechanical seal 9 between the positioning shaft platform 101 and the pressure member 4, forming a chamber 12 between the outer wall surface of the mandrel 1 and the mechanical seal 9. The pressure sealing cover 3 is disposed on the outer periphery of the mechanical seal 9. The pressure sealing cover 3 has a first interface 301, and the first interface 301 is connected to the first through hole 9021 on the mechanical seal 9. The first interface 301 can communicate with the chamber 12 through the first through hole 9021 on the mechanical seal 9.

[0056] In this invention, a non-portable double-end mechanical seal test fixture adapted to the cylindrical structure of the mechanical seal 9 is provided. This fixture allows for a sealing test of the mechanical seal 9 before it is installed in the pump. During the test, the mechanical seal 9 is fitted onto the outer circumference of the spindle 1, and the mechanical seal 9 is positioned using the pressure member 4. Specifically, the mechanical seal 9 is pressed between the positioning shaft 101 at one end of the spindle 1 and the pressure member 4 at the other end of the spindle 1. Because a certain gap is left between the outer wall surface of the spindle 1 and the mechanical seal 9, after the mechanical seal 9 is positioned and assembled with the spindle 1, a gap will form between the outer wall surface of the spindle 1 and the mechanical seal 9. A cylindrical chamber 12 is formed. Since the pressure sealing cover 3 is set on the outer periphery of the mechanical seal 9, and the chamber can be connected to the external pressure device 7 through the first interface 301 on the pressure sealing cover 3 and the first through hole 9021 on the mechanical seal 9, the pressure device 7 can pressurize the chamber 12 through the first interface 301 and the first through hole 9021, and determine whether there is a leakage position in the mechanical seal 9 according to the pressure holding state in the chamber 12. This realizes the sealing test of the mechanical seal 9 before pump installation. If there is a leakage position, it is easier to replace and repair, without having to disassemble and reassemble the pump, effectively improving production efficiency.

[0057] It should be noted that during the pressure test of the mechanical seal 9, the pressure sealing cover 3 is part of the test fixture, and can be connected to the external pressure testing device 7. When the pump is installed, the pressure sealing cover 3 can also function as part of the mechanical seal 9. The pressure sealing cover 3 is fitted over the outer side of the first compensation ring 902 and the second compensation ring 903, pressing them together to achieve connection between the first compensation ring 902 and the second compensation ring 903. A third sealing ring 908 and a fourth sealing ring 909 are respectively sandwiched between the inner wall of the pressure sealing cover 3 and the outer walls of the first compensation ring 902 and the second compensation ring 903, achieving a seal between the pressure sealing cover 3 and the first compensation ring 902 and the second compensation ring 903, thereby ensuring good sealing performance of the mechanical seal 9.

[0058] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the non-container double-end mechanical seal test fixture also includes a connector 5, which is located at the first interface 301 and is connected to the pressure testing device 7 via a pressure transmission pipe 6.

[0059] In one optional embodiment of this utility model, such as Figure 1 and Figure 2As shown, the pressure sealing gland 3 also has a second interface 302, which is used to communicate with the chamber 12 through the second through hole 9022 on the mechanical seal 9. Under normal pressure testing of the chamber 12, the pressure testing device 7 can pressurize the chamber 12 through the first interface 301 and the first through hole 9021. A plug 8 is installed at the second interface 302 to seal it. After the sealing test is completed, the second interface 302 can be opened by removing the plug 8, allowing the gas in the chamber 12 to escape and restoring the chamber 12 to normal pressure, so that the mechanical seal 9 can be removed for subsequent pump installation. Alternatively, to improve testing efficiency, connectors 5 can be provided at the first interface 301 and the second interface 302 respectively, connecting the first interface 301 and the second interface 302 to two pressure testing devices 7 respectively. This allows for simultaneous pressure testing of the chamber 12 by the two pressure testing devices 7, improving pressure testing efficiency and achieving rapid pressure testing and depressurization.

[0060] Furthermore, the plug 8 can be welded from a regular plug and a wing nut, making it easy to install and disassemble.

[0061] Furthermore, such as Figure 1 and Figure 2 As shown, the first interface 301 and the second interface 302 are symmetrically arranged on both sides of the mandrel 1. When the first interface 301 and the second interface 302 simultaneously pressurize the chamber 12, it can ensure that the gas is quickly and evenly distributed after entering the chamber 12, so that the gas pressure at each position in the chamber 12 reaches equilibrium, thereby speeding up the test and improving the accuracy of the test.

[0062] In this design, both the first interface 301 and the second interface 302 can be threaded holes, and the connector 5 can be a quick-connect pneumatic connector with external threads. At least a portion of the quick-connect pneumatic connector is screwed into the threaded hole to achieve quick connection and sealing.

[0063] The pressure device 7 used in this utility model can be, but is not limited to, an air pump.

[0064] In an optional embodiment of this invention, pressure sensing elements can be installed in the pressurizing device 7, the pressure supply pipe 6, the chamber 12, the first interface 301, and / or the second interface 302. This allows the pressure sensing elements to detect the pressure holding status of the chamber 12 after pressurization, thereby determining whether there is a leak in the mechanical seal 9. The pressure sensing elements can be, but are not limited to, pressure sensors.

[0065] In one optional embodiment of this utility model, such as Figures 1 to 3As shown, the positioning shaft 101 forms an annular first positioning step 1011 on the side facing the pressure member 4. The first positioning step 1011 is used to abut against one end of the mechanical seal 9, and the wall surface of the pressure member 4 on the side facing the positioning shaft 101 is used to seal against the other end of the mechanical seal 9. Thus, the axial positioning of the mechanical seal 9 is achieved through the cooperation of the positioning shaft 101 and the pressure member 4, and the closed state of the chamber 12 is ensured, which effectively improves the accuracy of the sealing test of the mechanical seal 9.

[0066] In one optional embodiment of this utility model, such as Figures 1 to 3 As shown, the second end of the mandrel 1 has a connecting hole 104, and a fastener 2 is disposed in the connecting hole 104. The fastener 2 passes through the pressure member 4 and is connected to the connecting hole 104, thereby fixing it to the second end of the mandrel 1. The connecting hole 104 can be a threaded hole, and the fastener 2 can be a screw adapted to the threaded hole. By screwing the screw into the threaded hole, the pressure member 4 is locked. Furthermore, the screw can be, but is not limited to, a wing screw, for easier assembly and disassembly.

[0067] In one optional embodiment of this utility model, such as Figures 1 to 3 As shown, from the first end to the second end of the mandrel 1, the mandrel 1 is sequentially formed with decreasing radii: a positioning shaft platform 101, a middle shaft section 102, and a positioning shaft section 103. The outer wall of the middle shaft section 102, near the positioning shaft platform 101, is used to fit against the inner wall of the mechanical seal 9, near the positioning shaft platform 101. The outer wall of the positioning shaft section 103 is used to fit against the inner wall of the mechanical seal 9, near the pressure member 4, so that the aforementioned chamber 12 is formed between the outer wall of the middle shaft section 102 and the inner wall of the mechanical seal 9. Through the cooperation of the positioning shaft platform 101, the middle shaft section 102, and the positioning shaft section 103, the mechanical seal 9 can be positioned axially and circumferentially under test conditions to ensure the formation of a stable chamber 12 and improve the accuracy of the sealing test.

[0068] Furthermore, such as Figures 1 to 3As shown, a second annular positioning step 1021 is formed on the side of the central shaft section 102 facing the positioning shaft section 103. The second positioning step 1021 is used to abut against an annular boss on the inner wall of the mechanical seal 9. By cooperating with the first positioning step 1011 and the second positioning step 1021, the two ends of the mechanical seal 9 can be positioned respectively to ensure the stable installation of the mechanical seal 9. Regarding the specific structure of the mechanical seal 9 described above, one end of the first rotating ring 901 abuts against the first positioning step 1011, while an annular boss on the inner wall of the second rotating ring 904 abuts against the second positioning step 1021 to achieve axial positioning of the first rotating ring 901 and the second rotating ring 904. Since the first rotating ring 901 and the second rotating ring 904 have been positioned axially, the structures such as the first compensation ring 902 and the second compensation ring 903 located between them are in an axially positioned state.

[0069] Furthermore, such as Figures 1 to 3 As shown, the positioning shaft section 103 has an annular sealing groove 105 along its circumference. A first sealing ring 11 is interference-fitted into the sealing groove 105, and the first sealing ring 11 is pressed tightly between the sealing groove 105 and the mechanical seal 9, thereby ensuring a stable seal between the positioning shaft section 103 and the mechanical seal 9. Additionally, a second sealing ring 10 is provided between the outer wall of the middle shaft section 102, near the positioning shaft platform 101, and the mechanical seal 9, thereby ensuring a stable seal between the middle shaft section 102, near the positioning shaft platform 101, and the mechanical seal 9. Specifically, the first sealing ring 11 is sandwiched between the inner wall of the second rotating ring 904 and the outer wall of the positioning shaft section 103, while the second sealing ring 10 is sandwiched between the inner wall of the first rotating ring 901 and the outer wall of the middle shaft section 102, near the positioning shaft platform 101, achieving axial sealing on both sides of the chamber 12 and ensuring the accuracy of testing the mechanical seal 9.

[0070] In one optional embodiment of this utility model, such as Figure 1 As shown, the pressure member 4 is a pressure plate 401 with a flat plate structure. The pressure plate 401 is set at the second end of the spindle 1. The fastener 2 passes through the pressure plate 401 and fixes the pressure plate 401 to the second end of the spindle 1. The mechanical seal 9 is pressed between the two by the cooperation of the pressure plate 401 and the positioning shaft table 101.

[0071] In another optional embodiment of this utility model, such as Figure 2As shown, the pressure member 4 can also be a pressure cover 402. The pressure cover 402 has a cylindrical structure with one end open and the other end sealed. When the mechanical seal 9 is being tested for sealing, the pressure cover 402 covers the outside of the mechanical seal 9 (that is, the mandrel 1 and the mechanical seal 9 located on the outer periphery of the mandrel 1 are inserted into the pressure cover 402 through the open end). The inner wall of the sealed end of the pressure cover 402 cooperates with the positioning shaft 101 to press the mechanical seal 9 between the two. The pressure sealing cover 3 has an annular positioning boss 303. The inner wall near the open end of the pressure cover 402 abuts against the outer wall of the positioning boss 303. The pressure cover 402 can cooperate with the positioning shaft 101 to press the mechanical seal 9 axially, thereby achieving axial positioning of the mechanical seal 9. Moreover, the pressure cover 402 can also position the relative position between the mandrel 1 and the pressure sealing cover 3, ensuring the coaxiality of the mandrel 1 and the pressure sealing cover 3. This, in turn, ensures the coaxiality of the first rotating ring 901, the first compensating ring 902, the second rotating ring 904, and the second compensating ring 903 located on the outer periphery of the mandrel 1. This ensures that the sealing surfaces between the two sealed components will not be misaligned and will remain tightly fitted. This effectively eliminates the possibility of leakage caused by misalignment of the sealing surfaces between the two sealed components during the pressure test, making the test results more accurate.

[0072] The specific testing process for the mechanical seal 9 using the non-containerized double-end mechanical seal testing fixture of this utility model is as follows: The first rotating ring 901, the first compensating ring 902, the second compensating ring 903, and the second rotating ring 904 are sequentially fitted onto the mandrel 1, ensuring that the first rotating ring 901 and the first compensating ring 902 can rotate and remain tightly fitted through the first rotating sealing ring 906, and that the second rotating ring 904 and the second compensating ring 903 can rotate and remain tightly fitted through the second rotating sealing ring 907. A pressure sealing cap 3 is fitted onto the outer side of the first compensating ring 902 and the second compensating ring 903. A pressure member 4 is set at one end of the mandrel 1 and fixed to one end of the mandrel 1 by fasteners 2. At this time, the pressure member 4 cooperates with the positioning shaft 101 at the other end of the mandrel 1 to press the mechanical seal 9 between them axially. At this time, the spring 905 between the first compensating ring 902 and the second compensating ring 903 is in a compressed state. Afterwards, the plug 8 can be screwed into the second port 302 of the pressure sealing cap 3, while the first port 301 of the pressure sealing cap 3 is connected to the connector 5 and the pressure supply pipe 6. The pressure supply pipe 6 is connected to the pressure device 7. When the pressure device 7 is turned on, compressed air enters the chamber 12 through the pressure supply pipe 6, connector 5, first port 301 and first through hole 9021 in sequence. At this time, the compressed air can be cut off to maintain the pressure of the gas in the chamber 12. If the gas pressure in the chamber 12 drops beyond the preset threshold within a preset time, it indicates that there is a leak in the mechanical seal 9. Otherwise, it indicates that there is no leak in the seal.

[0073] In addition, the pressure-tested tooling and mechanical seal 9 can be immersed in a water tank. If there is a leak in the mechanical seal 9, bubbles can be seen overflowing at the leak location, which can more intuitively determine whether the seal is leaking and directly determine the location of the leak.

[0074] The features and advantages of this non-portable double-end mechanical seal testing fixture are:

[0075] This non-portable double-end mechanical seal testing fixture can perform a pressure sealing test on the mechanical seal 9 before it is installed on the pump, thus enabling the detection of its sealing performance. If a leak is found, the leak location can be directly observed and confirmed, and the mechanical seal 9 can be replaced or repaired in a timely manner without having to disassemble and reassemble the pump, effectively improving production efficiency and ensuring the sealing effect of the product.

[0076] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0077] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0078] The above are merely several embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A non-packaged double face mechanical seal test tool for performing a seal test on a mechanical seal in a cylindrical shape, characterized by, The non-portable double-end mechanical seal testing fixture includes: A mandrel, along the axial direction of the mandrel, has a first end and a second end opposite to each other, and an annular positioning pedestal is formed at the first end of the mandrel; A pressing element is disposed at the second end of the mandrel. The positioning shaft table cooperates with the pressing element to press the mechanical seal sleeved on the outer periphery of the mandrel between the positioning shaft table and the pressing element, and to form a cavity between the outer wall surface of the mandrel and the mechanical seal. A pressure sealing cover has a first interface. The pressure sealing cover is used to be disposed on the outer periphery of the mechanical seal, and the first interface is used to communicate with the chamber through a first through hole on the mechanical seal.

2. The non-contained double mechanical seal test fixture of claim 1, wherein, The pressure sealing cover also has a second interface, and the second interface is used to communicate with the chamber through the second through hole on the mechanical seal; A plug is provided at the second interface.

3. The non-gathered double mechanical seal test fixture of claim 2, wherein, The non-portable double-end mechanical seal test fixture also includes a connector, which is located at the first interface and is connected to the pressure testing device via a pressure pipe.

4. The non-gathered double mechanical seal test fixture of claim 1, wherein, The positioning shaft platform forms an annular first positioning step on the side facing the pressure member. The first positioning step is used to abut against one end of the mechanical seal, and the wall surface of the pressure member on the side facing the positioning shaft platform is used to seal against the other end of the mechanical seal.

5. The non-gathered double mechanical seal test fixture of claim 4, wherein, The second end of the mandrel has a connecting hole, and a fastener is provided in the connecting hole. The pressure member is fixed to the second end of the mandrel by the fastener.

6. The non-gathered double mechanical seal test fixture of claim 4, wherein, From the first end to the second end of the mandrel, the mandrel is sequentially formed with decreasing radii of a positioning shaft platform, a middle shaft section, and a positioning shaft section. The outer wall of the middle shaft section near the positioning shaft platform is used to fit against the inner wall of the mechanical seal near the positioning shaft platform. The outer wall of the positioning shaft section is used to fit against the inner wall of the mechanical seal near the pressure member, so as to form the cavity between the outer wall surface of the middle shaft section and the inner wall of the mechanical seal.

7. The non-gathered double mechanical seal test fixture of claim 6 wherein, The middle shaft section and the side facing the positioning shaft section form an annular second positioning step, which is used to abut against an annular boss on the inner wall of the mechanical seal.

8. The non-gathered double mechanical seal test fixture of claim 6, wherein, The positioning shaft section has a sealing groove along its circumference, and a first sealing ring is interference-fitted into the sealing groove. The first sealing ring is sealed and pressed between the sealing groove and the mechanical seal. And / or, a second sealing ring is provided between the outer wall of the middle shaft section and the portion near the positioning shaft platform and the mechanical seal.

9. The non-gathered double mechanical seal test fixture of claim 1 wherein, The pressing component is a pressure plate, which cooperates with the positioning shaft to press the mechanical seal between them.

10. The non-gathered double mechanical seal test fixture of claim 1, wherein, The pressure component is a pressure cover, which is a cylindrical structure with one end open and the other end sealed. The pressure cover is used to cover the outside of the mechanical seal, and the inner wall of the sealed end of the pressure cover cooperates with the positioning shaft to press the mechanical seal between the two. The pressure sealing cover has an annular positioning boss, and the inner wall near the open end of the pressure cover abuts against the outer wall of the positioning boss.

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