Mechanical seal static pressure experiment tool
By using telescopic parts to isolate the docking shaft assembly and the mechanical seal inner cavity in the mechanical sealing experimental tooling, the problem of poor sealing effect between the mandrel and the pressing plate is solved, and the accuracy and reliability of detection are achieved.
Patent Information
- Application Number
- CN202422530923.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-21
AI Technical Summary
In the existing mechanical seal static pressure experimental tooling, the sealing effect between the mandrel and the press plate is poor, resulting in inaccurate detection results.
A mechanical seal static pressure experimental tool is designed to fix the sleeve of the docking shaft assembly, and the docking shaft assembly is separated from the oil or gas in the mechanical seal inner cavity by using the telescopic member to avoid leakage.
It ensures the accuracy of the mechanical seal static pressure experiment, prevents oil or gas leakage during the detection process, and improves the reliability of the detection results.
Smart Images
Figure CN223217026U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of mechanical seal-related equipment, and in particular to a mechanical seal static pressure test fixture. Background Art
[0002] During the manufacturing and procurement process of mechanical seal components, it is inevitable that some defective parts will flow into the final assembly. This can also cause some parts to be missed or incorrectly installed, or damage the fragile dynamic and static rings during the later assembly process, all of which will affect the quality of the mechanical seal. After the mechanical seal is assembled, a static pressure test can verify the sealing performance of the mechanical seal and whether there are defects such as damage, missing or incorrect installation of parts. Therefore, the static pressure test is the most important step in verifying the performance of the mechanical seal.
[0003] In the prior art, when conducting a static pressure test of a mechanical seal, the upper and lower ports of the mechanical seal are sealed by a pressure plate and a base, and then gas, water or oil is introduced into the cavity of the mechanical seal to detect the sealing state of the mechanical seal. The base has a core shaft, and the pressure plate slides on the core shaft and is then pressed against the upper end face of the mechanical seal. During the sliding of the pressure plate on the core shaft, in order to ensure the sealing performance between the pressure plate and the core shaft, a sealing ring is usually required to be installed between the pressure plate and the core shaft to prevent the oil or gas in the mechanical seal cavity from leaking. However, the sealing ring is very likely to produce irregular deformation during the sliding process, resulting in leakage points. In particular, if this device is to be used multiple times, the sealing ring will cause more wear due to multiple sliding, and then gaps will be generated to cause leakage, resulting in inaccurate test results.
[0004] Therefore, it is necessary for the inventor to design a new mechanical seal static pressure test fixture to overcome the above problems. Summary of the Invention
[0005] The main purpose of the present application is to provide a mechanical seal static pressure test fixture to solve the problem of poor sealing effect caused by sliding between the core shaft and the pressure plate in the mechanical seal static pressure fixture in the related art.
[0006] In order to achieve the above-mentioned object, the present application provides a mechanical seal static pressure test fixture, comprising a base and a pressure plate, a docking shaft assembly is fixedly provided between the base and the pressure plate, and a pressure hole is fixedly provided on the pressure plate;
[0007] a telescopic member, one end of which is fixedly connected to the base, the other end of which is detachably connected to the pressing plate, and the telescopic member is sleeved on the outside of the docking shaft assembly;
[0008] It also includes a pressing piece, which is used to press the pressing plate toward the base.
[0009] Preferably, the docking shaft assembly includes a core shaft and a through hole, the core shaft is fixedly arranged on the base, the through hole is opened on the pressure plate, and the core shaft is plugged into the through hole.
[0010] Preferably, the pressing member includes a threaded portion and a nut, the threaded portion is fixedly arranged on the upper end of the core shaft, and the nut is threadedly connected to the threaded portion.
[0011] Preferably, a gasket is fixedly arranged between the nut and the pressing plate.
[0012] Preferably, the telescopic member includes a bellows, the bottom of the bellows is fixedly connected to the base, and a connecting structure is fixedly provided between the top of the bellows and the pressure plate.
[0013] Preferably, the connection structure includes a docking groove provided at the bottom of the pressure plate, the inner wall of the docking groove is fixedly provided with an internal thread, the top of the bellows is fixedly provided with an external thread, and the bellows is threadedly connected to the docking groove.
[0014] Preferably, the docking mechanism includes an annular groove and a negative pressure part, the annular groove is opened at the bottom of the pressure plate, and the negative pressure part is fixedly arranged on the top of the corrugated tube. After the negative pressure part is pressed in the annular groove, it is fixedly connected to the pressure plate through vacuum negative pressure.
[0015] Preferably, the bellows is made of metal.
[0016] Preferably, the outer end of the base is fixedly provided with a first step portion for limiting the bottom of the mechanical sealing workpiece, the outer end of the pressure plate is fixedly provided with a second step portion for limiting the top of the workpiece, a first seal is also fixedly provided between the workpiece and the base, and a second seal is also fixedly provided between the workpiece and the pressure plate.
[0017] The utility model provides a mechanical seal static pressure test tool, which has the following beneficial effects compared with the prior art:
[0018] By fixing a telescopic part on the outside of the docking shaft assembly, the docking shaft assembly is separated from the oil or gas in the inner cavity of the mechanical seal. In this way, the up and down movement of the pressure plate along the docking shaft assembly has no effect on the sealing test of the mechanical seal, thereby ensuring the accuracy of the static pressure test of the mechanical seal. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings that constitute part of this application are used to provide a further understanding of this application and make other features, objects and advantages of this application more apparent. The illustrative embodiment drawings of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:
[0020] Figure 1 This is the overall structure diagram of the utility model (Example 1);
[0021] Figure 2 This is an exploded view of the utility model (Example 1);
[0022] Figure 3 This is a schematic diagram of the bottom structure of the pressing plate of the utility model (Example 1);
[0023] Figure 4 It is a cross-sectional view of the utility model (Example 1);
[0024] Figure 5 This is a structural diagram of the connection between the bellows and the pressing plate of the utility model (Example 2).
[0025] Among them: 1. Base; 2. Pressure plate; 3. Pressurized hole; 4. Core shaft; 401. Threaded part; 5. Nut; 6. Gasket; 7. Bellows; 8. Docking groove; 9. First step part; 10. Second step part; 11. First seal; 12. Second seal; 13. Annular groove; 14. Negative pressure part; 15. Workpiece (mechanical seal). DETAILED DESCRIPTION
[0026] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.
[0027] It should be noted that the terms "first", "second", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0028] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.
[0029] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0030] Additionally, the term "plurality" shall mean two or more.
[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0032] Example 1:
[0033] like Figures 1 to 4 As shown, a mechanical seal static pressure test fixture includes a base 1 and a pressure plate 2, a docking shaft assembly is fixedly arranged between the base 1 and the pressure plate 2, and a pressurizing hole 3 is fixedly arranged on the pressure plate 2; a telescopic member, one end of the telescopic member is fixedly connected to the base 1, and the other end of the telescopic member is detachably connected to the pressure plate 2, and the telescopic member is sleeved on the outside of the docking shaft assembly; and also includes a clamping member, which is used to press the pressure plate 2 toward the base 1.
[0034] Specifically, when conducting a static pressure test, the mechanical seal workpiece 15 is first placed on the base 1, and the positions of the pressure plate 2 and the base 1 are preliminarily defined by the docking shaft assembly. Then, one end of the telescopic part is fixedly connected to the pressure plate 2, and finally, the pressure plate 2 is pressed downward by the clamping part until the upper and lower ends of the mechanical seal workpiece 15 are clamped. In the process of the pressure plate 2 being pressed downward, the telescopic part is compressed synchronously. After being clamped, gas or liquid can be introduced into the cavity of the mechanical seal through the pressurized hole 3 to detect the sealing performance of the mechanical seal. After the gas or liquid is introduced, whether it is gas or liquid, it only contacts the outer peripheral surface of the telescopic part and cannot contact the docking shaft, so it cannot leak from the gap between the docking shaft assembly and the pressure plate 2.
[0035] In this embodiment, a telescopic part is fixedly sleeved on the outside of the docking shaft assembly to separate the docking shaft assembly from the oil or gas in the inner cavity of the mechanical seal. In this way, the up and down movement of the pressure plate 2 along the docking shaft assembly has no effect on the sealing test of the mechanical seal, thereby ensuring the accuracy of the static pressure test of the mechanical seal.
[0036] The docking shaft assembly includes a core shaft 4 and a through hole. The core shaft 4 is fixedly arranged on the base 1. The through hole is opened on the pressure plate 2. The core shaft 4 is plugged into the through hole. Specifically, the core shaft 4 is inserted into the through hole, so that the pressure plate 2 slides up and down along the core shaft 4.
[0037] The pressing member includes a threaded portion 401 and a nut 5. The threaded portion 401 is fixedly provided on the upper end of the core shaft 4. The nut 5 is threadedly connected to the threaded portion 401. Specifically, the nut 5 rotates to press the pressing plate 2 downward until the pressing plate 2 is pressed on the workpiece 15.
[0038] A gasket 6 is fixedly provided between the nut 5 and the pressing plate 2. Specifically, by providing the gasket 6, the pressure of the nut 5 can be transmitted more evenly, and the rotation stroke of the nut 5 can be shortened, and the length of the threaded portion 401 can be designed to be shorter.
[0039] The telescopic member includes a bellows 7, the bottom of which is fixedly connected to the base 1, and a connecting structure is fixedly provided between the top of the bellows 7 and the pressing plate 2. Specifically, the bottom of the bellows 7 can be fixedly connected to the base 1 by welding or gluing, while the top of the bellows 7 is fixedly connected to the pressing plate 2 via the connecting structure.
[0040] The connection structure includes a docking groove 8 provided at the bottom of the pressure plate 2. The inner wall of the docking groove 8 is fixedly provided with an internal thread. The top of the bellows 7 is fixedly provided with an external thread. The bellows 7 is threadedly connected to the docking groove 8. Specifically, the bellows 7 and the docking groove 8 are threadedly connected. Due to the inherent characteristics of the thread, the threaded connection is not prone to gas or liquid leakage. According to actual needs, a sealing ring can be fixedly provided at the top of the docking groove 8 for further sealing to prevent leakage.
[0041] The bellows 7 is made of metal. Specifically, when gas or liquid is introduced into the inner cavity of the mechanical seal, its pressure will act on the outer wall of the bellows 7, which may cause the bellows 7 to deform, resulting in inaccurate detection results or damage to the bellows 7. Therefore, the bellows 7 is made of a metal material with strong pressure resistance to reduce the occurrence of destructive deformation. In actual use, the bellows 7 can also be made of a plastic with higher hardness.
[0042] A first stepped portion 9 is fixedly provided at the outer end of the base 1 to limit the bottom of the mechanical seal workpiece 15, and a second stepped portion 10 is fixedly provided at the outer end of the pressure plate 2 to limit the top of the workpiece 15. A first sealing member 11 is also fixedly provided between the workpiece 15 and the base 1, and a second sealing member 12 is also fixedly provided between the workpiece 15 and the pressure plate 2. Specifically, the first stepped portion 9 and the second stepped portion 10 limit the bottom and top of the mechanical seal, respectively, while the first sealing member 11 and the second sealing member 12 seal the bottom and top of the mechanical seal, respectively.
[0043] Example 2: Figure 5 As shown, the difference between this embodiment and the first embodiment is that the docking mechanism includes an annular groove 13 and a negative pressure portion 14. The annular groove 13 is opened at the bottom of the pressure plate 2, and the negative pressure portion 14 is fixedly arranged on the top of the bellows 7. After the negative pressure portion 14 is pressed in the annular groove 13, it is fixedly connected to the pressure plate 2 through vacuum negative pressure. Specifically, when connecting the bellows 7 and the pressure plate 2, it is only necessary to press the upper end of the bellows 7 in the annular groove 13 with force, squeeze out the gas in the negative pressure portion 14 and the annular groove 13, and then the bellows 7 and the pressure plate 2 can be adsorbed together by negative pressure. This connection method is simpler when connecting, but the corresponding production cost of this type of bellows 7 is relatively high and needs to be customized.
[0044] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.
Claims
1. A mechanical seal static pressure test tool, characterized by: It comprises a base (1) and a pressing plate (2), a docking shaft assembly is fixedly provided between the base (1) and the pressing plate (2), and a pressurizing hole (3) is fixedly provided on the pressing plate (2); a telescopic member, one end of the telescopic member being fixedly connected to the base (1), the other end of the telescopic member being detachably connected to the pressing plate (2), and the telescopic member being sleeved on the outside of the docking shaft assembly; It also includes a pressing member, which is used to press the pressing plate (2) towards the base (1).
2. A mechanical seal static pressure test fixture according to claim 1, characterized in that: The docking shaft assembly comprises a core shaft (4) and a through hole, wherein the core shaft (4) is fixedly arranged on the base (1), the through hole is opened on the pressing plate (2), and the core shaft (4) is plugged into the through hole.
3. A mechanical seal static pressure test fixture according to claim 2, characterized in that: The pressing member comprises a threaded portion (401) and a nut (5), wherein the threaded portion (401) is fixedly arranged on the upper end of the core shaft (4), and the nut (5) is threadedly connected to the threaded portion (401).
4. A mechanical seal static pressure test fixture as claimed in claim 3, characterized in that: A gasket (6) is also fixedly provided between the nut (5) and the pressure plate (2).
5. The mechanical seal static pressure test fixture according to claim 1, characterized in that: The telescopic member comprises a bellows (7), the bottom of the bellows (7) is fixedly connected to the base (1), and a connection structure is fixedly provided between the top of the bellows (7) and the pressing plate (2).
6. A mechanical seal static pressure test fixture according to claim 5, characterized in that: The connection structure comprises a docking groove (8) provided at the bottom of the pressing plate (2), an inner wall of the docking groove (8) is fixedly provided with an internal thread, and a top of the bellows (7) is fixedly provided with an external thread, and the bellows (7) and the docking groove (8) are threadedly connected.
7. The mechanical seal static pressure test fixture according to claim 5, characterized in that: The connection structure comprises an annular groove (13) and a negative pressure portion (14); the annular groove (13) is provided at the bottom of the pressure plate (2); the negative pressure portion (14) is fixedly arranged at the top of the bellows (7); and after the negative pressure portion (14) is pressed tightly in the annular groove (13), a fixed connection with the pressure plate (2) is achieved through vacuum negative pressure.
8. The mechanical seal static pressure test fixture according to claim 5, characterized in that: The material of the bellows (7) is metal.
9. The mechanical seal static pressure test fixture according to claim 1, characterized in that: A first step portion (9) for limiting the bottom of the mechanical sealing workpiece (15) is fixedly provided at the outer end of the base (1), a second step portion (10) for limiting the top of the workpiece (15) is fixedly provided at the outer end of the pressure plate (2), a first sealing member (11) is fixedly provided between the workpiece (15) and the base (1), and a second sealing member (12) is fixedly provided between the workpiece (15) and the pressure plate (2).