Non-container single-end mechanical seal test fixture

Abstract

This invention proposes a non-portable single-end mechanical seal testing fixture, comprising a mandrel and a pressure plate. The mandrel has a first end and a second end, with an annular positioning platform formed at the first end. The pressure plate is positioned at the second end of the mandrel, and the positioning platform cooperates with the pressure plate to press the mechanical seal, which is sleeved on the outer circumference of the mandrel, between the positioning platform and the pressure plate, forming a chamber between the outer wall of the mandrel and the mechanical seal. The mandrel has a pressure inlet channel, one end of which connects to an external pressure testing device, and the other end of which communicates with the chamber. 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 single-end 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 single-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 single-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-component single-end-face mechanical seal testing fixture, which is used to perform sealing tests on cylindrical mechanical seals. The non-component single-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 pressure plate is disposed at the second end of the mandrel. The positioning shaft platform cooperates with the pressure plate to press the mechanical seal sleeved on the outer periphery of the mandrel between the positioning shaft platform and the pressure plate, and to form a cavity between the outer wall surface of the mandrel and the mechanical seal.

[0010] The mandrel has a pressure inlet channel. One end of the pressure inlet channel is used to connect to an external pressure device, and the other end of the pressure inlet channel is connected to the chamber.

[0011] In a preferred embodiment of the present invention, the positioning shaft platform forms an annular first positioning step on the side facing the pressure plate. The first positioning step is used to abut against one end of the mechanical seal, and the wall surface of the pressure plate on the side facing the positioning shaft platform is used to seal against the other end of the mechanical seal.

[0012] In a preferred embodiment of the present invention, the second end of the mandrel has a first connecting hole, and a fastener is provided in the first connecting hole. The pressure plate is fixed to the second end of the mandrel by the fastener.

[0013] In a preferred embodiment of the present invention, the first end of the mandrel has a second connecting hole communicating with the pressure inlet channel, and a connector is provided at the second connecting hole. The connector is connected to the pressure-pressing device through a pressure-transmitting pipe.

[0014] In a preferred embodiment of the present invention, the pressure inlet channel includes a first pressure inlet channel extending along the axial direction of the mandrel and a second pressure inlet channel extending at an angle to the axial direction of the mandrel. One end of the first pressure inlet channel is connected to the second connecting hole, one end of the second pressure inlet channel is connected to the first pressure inlet channel, and the other end of the second pressure inlet channel is connected to the chamber.

[0015] 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: a positioning shaft platform, a first positioning segment, a connecting segment, and a second positioning segment. The outer wall of the first positioning segment is used to fit against the inner wall of the mechanical seal on the side near the positioning shaft platform, and the outer wall of the second positioning segment is used to fit against the inner wall of the mechanical seal on the side near the pressure plate, so as to form the cavity between the outer wall surface of the connecting segment and the inner wall of the mechanical seal.

[0016] In a preferred embodiment of the present invention, the connecting segment forms an annular second positioning step on the side facing the second positioning segment, and the second positioning step is used to abut against an annular boss on the inner wall of the mechanical seal.

[0017] In a preferred embodiment of the present invention, the first positioning step has a first groove along its circumference, and a first sealing ring is interference-fitted into the first groove, the first sealing ring being sealed and pressed between the first groove and the end of the mechanical seal.

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

[0019] In a preferred embodiment of this utility model, the first positioning segment, the connecting segment, and the second positioning segment are arranged coaxially.

[0020] Based on the above, the features and advantages of this utility model's non-container single-end mechanical seal testing fixture are:

[0021] Based on the cylindrical structure of the mechanical seal, a non-portable single-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, and a pressure plate positions it, pressing it between the positioning platform at one end of the mandrel and the pressure plate 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 inlet channel is provided within the mandrel, connecting the chamber to an external pressure-pressuring device. The pressure-pressuring device can then pressurize the chamber through this channel and determine the presence of a leak based on the pressure level 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 disassembling the pump, effectively improving production efficiency. Attached Figure Description

[0022] 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:

[0023] 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.

[0024] Figure 1 A schematic diagram of the non-container single-end mechanical seal test fixture of this utility model under sealing test conditions;

[0025] Figure 2 This is a schematic diagram of the non-container single-end mechanical seal testing fixture of this utility model.

[0026] The reference numerals in the accompanying drawings of this utility model are:

[0027] 1. Mandrel; 101. Positioning spindle;

[0028] 102. First positioning segment; 103. Connecting segment;

[0029] 104. Second positioning section; 105. Second connecting hole;

[0030] 106. First pressure inlet channel; 107. Second pressure inlet channel;

[0031] 108. First groove; 109. First positioning step;

[0032] 110. First connecting hole; 111. Second positioning step;

[0033] 112. Second groove; 2. Pressure plate;

[0034] 3. Fasteners; 4. Connectors;

[0035] 5. Pressure transmission pipe; 6. Pressure testing device;

[0036] 7. Chamber; 8. First sealing ring;

[0037] 9. Second sealing ring; 10. Mechanical seal;

[0038] 1001. Sealing gland; 1002. Compensating ring;

[0039] 1003. Rotating ring; 1004. Support sleeve;

[0040] 1005. First sealing ring; 1006. Second sealing ring;

[0041] 1007. Third sealing ring; 1008. Fourth sealing ring;

[0042] 1009. Spring. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] This utility model's non-portable single-end-face mechanical seal testing fixture can be used to perform a pressure test on the mechanical seal 10 on the outer circumference of a pump shaft (such as a centrifugal pump) before installation to determine the sealing effect of the mechanical seal 10. The mechanical seal 10 is a conventional mechanical seal, which is a sealing gland assembly for the pump shaft. Figure 1As shown, the mechanical seal 10 includes an annular sealing cap 1001, a compensating ring 1002, a rotating ring 1003, and a support sleeve 1004. The sealing cap 1001 is fitted around one end of the compensating ring 1002. A convex ring is formed on the inner edge of the annular sealing cap 1001. Multiple springs 1009 are pressed between one end of the compensating ring 1002 and the convex ring. The multiple springs 1009 are arranged at intervals along the circumference of the convex ring (multiple mounting holes can be drilled at the spring 1009 placement positions, and the multiple springs 1009 are placed in the corresponding mounting holes). The spring force of the springs 1009 pushes the rotating ring 1003 to maintain a tight fit between the compensating ring 1002 and the sealing cap 1001. In addition, a third sealing ring 1007 is provided between the inner wall of the sealing cap 1001 and the outer wall of the compensating ring 1002 to ensure a tight seal between the sealing cap 1001 and the compensating ring 1002. A rotating ring 1003 is fitted around the outer periphery of the support sleeve 1004, and a fourth sealing ring 1008 is provided between the outer wall of the rotating ring 1003 and the inner wall of the support sleeve 1004 to ensure a sealed connection between the rotating ring 1003 and the support sleeve 1004. One end of the rotating ring 1003 and the other end of the compensating ring 1002 can rotate relative to each other and maintain a tight fit through a first sealing ring 1005 connected to the compensating ring 1002 and a second sealing ring 1006 connected to the rotating ring 1003. The cooperation of the first sealing ring 1005 and the second sealing ring 1006 ensures that the rotating ring 1003 and the support sleeve 1004 can rotate in the pump-installed state, while the sealing gland 1001 and the compensating ring 1002 are stationary, and also ensures a stable seal between the first sealing ring 1005 and the second sealing ring 1006.

[0047] In this design, each ring in the first sealing ring 1005 and the second sealing ring 1006 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 first sealing ring 1005 and the second sealing ring 1006 are in a state of long-term relative rotation, they are not easily worn, and therefore leakage is less likely to occur at the contact point between the first sealing ring 1005 and the second sealing ring 1006, thus ensuring the stable operation of the mechanical seal 10. When the pump is installed, the sealing gland 1001 can be connected to the pump cover. The sealing gland 1001 and the compensation ring 1002 are in a stationary state, while the support sleeve 1004 is fitted on the pump shaft. The rotating ring 1003 and the support sleeve 1004 will rotate with the pump shaft.

[0048] The structure of the non-portable single-end mechanical seal testing fixture of this utility model is described below:

[0049] like Figure 1 and Figure 2 As shown, this utility model provides a non-component single-end-face mechanical seal testing fixture, which is used to perform sealing tests on a cylindrical mechanical seal 10. The non-component single-end-face mechanical seal testing fixture includes a mandrel 1 and a pressure plate 2. 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 platform 101 is formed at the first end of the mandrel 1. The pressure plate 2 is disposed at the second end of the mandrel 1. In the sealing test state, the mechanical seal 10 is sleeved on the outer circumference of the mandrel 1, and the positioning platform 101 cooperates with the pressure plate 2 to press the mechanical seal 10 between the positioning platform 101 and the pressure plate 2, forming a chamber 7 between the outer wall surface of the mandrel 1 and the mechanical seal 10. The mandrel 1 has a pressure inlet channel, one end of which is connected to an external pressure device 6, and the other end of which communicates with the chamber 7.

[0050] In this invention, a non-portable single-end mechanical seal test fixture adapted to the cylindrical structure of the mechanical seal 10 is provided. This fixture allows for a sealing test of the mechanical seal 10 before it is installed in the pump. During the test, the mechanical seal 10 is fitted onto the outer circumference of the mandrel 1, and the mechanical seal 10 is positioned by the pressure plate 2. Specifically, the mechanical seal 10 is pressed between the positioning shaft 101 at one end of the mandrel 1 and the pressure plate 2 at the other end of the mandrel 1. Because a certain gap is left between the outer wall of the mandrel 1 and the mechanical seal 10, the mechanical seal... After the seal 10 and the spindle 1 are positioned and assembled, a cylindrical chamber 7 will be formed between the outer wall of the spindle 1 and the mechanical seal 10. A pressure inlet channel is provided in the spindle 1 to connect the chamber 7 and the external pressure device 6. At this time, the pressure device 6 can pressurize the chamber 7 through the pressure inlet channel and determine whether there is a leakage position in the mechanical seal 10 based on the pressure holding state in the chamber 7. This realizes the sealing test of the mechanical seal 10 before pump installation. If there is a leakage position, it is easier to replace or repair it without disassembling and assembling the pump, which effectively improves production efficiency.

[0051] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the positioning shaft platform 101 forms an annular first positioning step 109 on the side facing the pressure plate 2. The first positioning step 109 is used to abut against one end of the mechanical seal 10. The wall surface of the pressure plate 2 on the side facing the positioning shaft platform 101 is used to seal against the other end of the mechanical seal 10. Thus, the axial positioning of the mechanical seal 10 is achieved through the cooperation of the positioning shaft platform 101 and the pressure plate 2, and the closed state of the chamber 7 is ensured, which effectively improves the accuracy of the sealing test of the mechanical seal 10.

[0052] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the second end of the mandrel 1 has a first connecting hole 110. A fastener 3 is provided in the first connecting hole 110. The fastener 3 passes through the pressure plate 2 and is connected in the first connecting hole 110, so that the pressure plate 2 can be fixed to the second end of the mandrel 1 by the fastener 3.

[0053] The first connecting hole 110 can be a threaded hole, and the fastener 3 can be a screw adapted to the threaded hole. By screwing the screw into the threaded hole, the pressure plate 2 is locked. Furthermore, the screw can be, but is not limited to, a wing screw, for easier disassembly and assembly.

[0054] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the first end of the mandrel 1 has a second connecting hole 105 that communicates with the pressure inlet channel. A connector 4 is provided at the second connecting hole 105. The connector 4 is connected to the pressure-pressing device 6 through the pressure-transmitting pipe 5.

[0055] The second connecting hole 105 can be a threaded hole, and the connector 4 can be a quick-connect pneumatic connector with external threads. At least part of the quick-connect pneumatic connector is screwed into the threaded hole to achieve quick connection and sealing.

[0056] The pressure device 6 used in this utility model can be, but is not limited to, an air pump.

[0057] In an optional embodiment of this invention, pressure sensing elements can be installed in the pressurizing device 6, the pressure supply pipe 5, the pressure inlet channel, and / or the chamber 7. This allows the pressure-sensing elements to detect the pressure holding status of the chamber 7 after pressurization, thereby determining whether there is a leak in the mechanical seal 10. The pressure sensing elements can be, but are not limited to, pressure sensors.

[0058] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the pressure inlet channel includes a first pressure inlet channel 106 extending along the axial direction of the mandrel 1 and a second pressure inlet channel 107 extending at an angle to the axial direction of the mandrel 1. One end of the first pressure inlet channel 106 is connected to the second connecting hole 105, one end of the second pressure inlet channel 107 is connected to the first pressure inlet channel 106, and the other end of the second pressure inlet channel 107 is connected to the chamber 7. The first pressure inlet channel 106 extends along the axial direction of the mandrel 1, while the second pressure inlet channel 107 extends radially along the mandrel 1, meaning the extension direction of the second pressure inlet channel 107 is perpendicular to the extension direction of the first pressure inlet channel 106 (the angle is 90°). This minimizes the overall length of the pressure inlet channel, reducing the possibility of leakage due to its design and ensuring the accuracy of the test.

[0059] In one specific embodiment of this utility model, such as Figure 1 and Figure 2 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 101, a first positioning section 102, a connecting section 103, and a second positioning section 104. The outer wall of the first positioning section 102 is used to fit against the inner wall of the mechanical seal 10 near the positioning shaft 101. The outer wall of the second positioning section 104 is used to fit against the inner wall of the mechanical seal 10 near the pressure plate 2, so as to form a cavity 7 between the outer wall of the connecting section 103 and the inner wall of the mechanical seal 10. Through the cooperation of the positioning shaft 101, the first positioning section 102, and the second positioning section 104, the mechanical seal 10 can be positioned axially and circumferentially in the test state to ensure the formation of a stable cavity 7 and improve the accuracy of the sealing test.

[0060] Furthermore, such as Figure 1 and Figure 2 As shown, a second annular positioning step 111 is formed on the side of the connecting section 103 facing the second positioning section 104. The second positioning step 111 abuts against an annular boss on the inner wall of the mechanical seal 10. By cooperating with the first positioning step 109 and the second positioning step 111, both ends of the mechanical seal 10 can be positioned respectively to ensure the stable installation of the mechanical seal 10. In the specific structure of the mechanical seal 10 described above, one end of the sealing gland 1001 abuts against the first positioning step 109, while an annular boss on the inner wall of the support sleeve 1004 abuts against the second positioning step 111 to achieve axial positioning of the sealing gland 1001 and the support sleeve 1004. Since the sealing gland 1001 and the support sleeve 1004 have been positioned axially, the compensation ring 1002, the rotating ring 1003, and other structures located between them are in an axially positioned state.

[0061] Furthermore, such as Figure 1 and Figure 2As shown, the first positioning step 109 has a first annular groove 108 along its circumference. A first sealing ring 8 is press-fitted into the first groove 108, sealing and pressing it between the first groove 108 and the end of the mechanical seal 10. Additionally, the outer wall of the second positioning section 104 has a second annular groove 112 along its circumference. A second sealing ring 9 is press-fitted into the second groove 112, sealing and pressing it between the second groove 112 and the inner wall of the mechanical seal 10. The first sealing ring 8 and the second sealing ring 9 ensure the sealing of the front and rear sides of the chamber 7 along the axial direction of the mandrel 1. Regarding the specific structure of the mechanical seal 10, the first sealing ring 8 is pressed between the end of the sealing cap 1001 and the first groove 108 on the first positioning step 109, while the second sealing ring 9 is pressed between the inner wall of the support sleeve 1004 and the second groove 112 on the outer wall of the second positioning section 104.

[0062] Furthermore, the first positioning segment 102, the connecting segment 103, and the second positioning segment 104 are arranged coaxially.

[0063] The specific testing process of the non-container single-end mechanical seal testing fixture of this utility model for the mechanical seal 10 is as follows: Assemble the sealing cap 1001 and the compensating ring 1002; install the spring 1009 and the third sealing ring 1007 between the sealing cap 1001 and the compensating ring 1002; fit the sealing cap 1001 and the compensating ring 1002 onto the outer circumference of the spindle 1, with one end of the sealing cap 1001 abutting and sealing against the first positioning step 109 of the positioning shaft 101; then fit the rotating ring 1003 and the support sleeve 1004 together; place the fourth sealing ring 1008 between the rotating ring 1003 and the support sleeve 1004; fit the rotating ring 1003 and the support sleeve 1004 onto the outer circumference of the spindle 1; and so on. An annular boss on the inner wall of the support sleeve 1004 abuts against the second positioning step 111 at one end of the connecting section 103, thereby achieving axial positioning of the support sleeve 1004. Since the first positioning section 102 and the second positioning section 104 are coaxially formed during processing, the sealing cap 1001 and the support sleeve 1004 that cooperate with it for positioning can also maintain the requirement of coaxial setting. The compensation ring 1002 and the rotating ring 1003 located between them can also maintain the requirement of coaxial setting. As a result, the sealing surfaces of the compensation ring 1002 and the rotating ring 1003 (i.e., the sliding sealing contact surface between the first sealing ring 1005 and the second sealing ring 1006) will not have large misalignment, and will not cause leakage at this position. Afterwards, the pressure plate 2 can be fixedly connected to the spindle 1 with screws. In the axial direction of the spindle 1, the pressure plate 2 is used to press the sealing cover 1001, the compensation ring 1002, the rotating ring 1003 and the support sleeve 1004 together and tighten them. The support sleeve 1004 is aligned and abuts against the second positioning step 111, while the sealing cover 1001 is aligned and abuts against the first positioning step 109. At this time, the spring 1009 can be in a compressed state. Afterwards, the connector 4 is connected to the second connecting hole 105. The connector 4 is connected to the pressure device 6 through the pressure pipe 5.

[0064] When the pressure device 6 is turned on, compressed air enters the chamber 7 sequentially through the pressure pipe 5, connector 4, first pressure inlet channel 106 and second pressure inlet channel 107. At this time, the compressed air can be cut off to maintain the pressure of the gas in the chamber 7. If the gas pressure in the chamber 7 drops beyond the preset threshold within the preset time, it indicates that there is a leak in the mechanical seal 10. Otherwise, it indicates that there is no leak in the seal.

[0065] Alternatively, the pressure-tested fixture and mechanical seal 10 can be immersed in a water tank. If there is a leak in the mechanical seal 10, bubbles can be seen overflowing at the leak location, thus more intuitively determining whether the seal is leaking and directly identifying the location of the leak.

[0066] The features and advantages of this non-portable single-end mechanical seal testing fixture are:

[0067] This non-portable single-end mechanical seal testing fixture can perform a pressure sealing test on the mechanical seal 10 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 10 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.

[0068] 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.

[0069] 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.

[0070] 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-containerized single-end-face mechanical seal testing fixture, used for sealing tests on cylindrical mechanical seals, characterized in that, The non-container single-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 shaft platform is formed at the first end of the mandrel; A pressure plate is disposed at the second end of the mandrel. The positioning shaft platform cooperates with the pressure plate to press the mechanical seal sleeved on the outer periphery of the mandrel between the positioning shaft platform and the pressure plate, and to form a cavity between the outer wall surface of the mandrel and the mechanical seal. The mandrel has a pressure inlet channel. One end of the pressure inlet channel is used to connect to an external pressure device, and the other end of the pressure inlet channel is connected to the chamber.

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

3. The non-gathered single end face mechanical seal test fixture of claim 2, wherein, The second end of the mandrel has a first connecting hole, and a fastener is provided in the first connecting hole. The pressure plate is fixed to the second end of the mandrel by the fastener.

4. The non-gathered single end face mechanical seal test fixture of claim 1, wherein, The first end of the mandrel has a second connecting hole that communicates with the pressure inlet channel. A connector is provided at the second connecting hole, and the connector is connected to the pressure-pressuring device through a pressure-transmitting pipe.

5. The non-gathered single end face mechanical seal test fixture of claim 4, wherein, The pressure inlet channel includes a first pressure inlet channel extending along the axial direction of the mandrel and a second pressure inlet channel extending at an angle to the axial direction of the mandrel. One end of the first pressure inlet channel is connected to the second connecting hole, one end of the second pressure inlet channel is connected to the first pressure inlet channel, and the other end of the second pressure inlet channel is connected to the chamber.

6. The non-gathered single end face mechanical seal test fixture of claim 2, wherein, From the first end to the second end of the mandrel, the mandrel is sequentially formed with decreasing radii: a positioning shaft platform, a first positioning section, a connecting section, and a second positioning section. The outer wall of the first positioning section is used to fit against the inner wall of the mechanical seal on the side near the positioning shaft platform, and the outer wall of the second positioning section is used to fit against the inner wall of the mechanical seal on the side near the pressure plate, so as to form the cavity between the outer wall of the connecting section and the inner wall of the mechanical seal.

7. The non-container single-end mechanical seal testing fixture as described in claim 6, characterized in that, The connecting section forms an annular second positioning step on one side facing the second positioning section, and the second positioning step is used to abut against an annular boss on the inner wall of the mechanical seal.

8. The non-gathered single end face mechanical seal test fixture of claim 6, wherein, The first positioning step has a first groove along its circumference, and a first sealing ring is interference-fitted into the first groove, the first sealing ring being sealed and pressed between the first groove and the end of the mechanical seal.

9. The non-gathered single end face mechanical seal test fixture of claim 6 or 8, wherein, The outer wall of the second positioning section has a second groove along its circumference, and a second sealing ring is interference-fitted into the second groove. The second sealing ring is sealed and pressed between the second groove and the inner wall of the mechanical seal.

10. The non-gathered single end face mechanical seal test fixture of claim 6, wherein, The first positioning segment, the connecting segment, and the second positioning segment are arranged on the same axis.

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