Anti-leakage backup mechanical seal device, centrifugal pump
By adopting a dual mechanical seal structure in the mechanical sealing device, the expansion material is used to push the moving ring into contact with the static ring to form a backup seal, which solves the problem of liquid leakage after mechanical seal wear, significantly improves the sealing effect, and avoids losses and safety hazards.
Patent Information
- Application Number
- CN202421093784.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-20
AI Technical Summary
Mechanical seals cause liquid leakage after wear, especially when unattended, which can cause significant losses and safety risks, especially when using valuable or dangerous liquids.
A dual mechanical seal structure is adopted, in which the expanded material expands when it encounters liquid, pushing the moving ring into contact with the static ring, thereby forming a backup seal to ensure that the liquid does not leak.
When the original mechanical seal is worn, the backup seal automatically plays a role, greatly increasing the sealing effect and avoiding property losses and safety hazards.
Smart Images
Figure CN222702217U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a liquid leakage-proof backup mechanical seal device and a centrifugal pump. Background Art
[0002] In the prior art, mechanical seals are a more common sealing method. However, mechanical seals have a service life. When mechanical seals are worn, the objects they are used to seal, such as liquids, will leak, especially when left unattended, causing great losses. If the liquid is precious or dangerous, not only will the loss be huge, but it will also cause huge safety hazards.
[0003] Mechanical seals are very common. For example, in a centrifugal pump, if the mechanical seal fails due to wear, the liquid in the pump chamber will leak. If it leaks into the motor, it will cause damage to the motor. If it is the precious liquid or dangerous liquid mentioned above, the loss and harm will be even greater.
[0004] Nowadays, various equipment are becoming more and more automated and even intelligent, and unmanned operation has almost become the norm. Therefore, how to ensure the safe operation of equipment within the maintenance interval is a market pain point and demand, and has long been a focus of research and development. Summary of the invention
[0005] According to an embodiment of the utility model, a liquid leakage-proof backup mechanical sealing device is provided, comprising:
[0006] Ring seat;
[0007] An expansion material, the expansion material being disposed at one end of the annular seat;
[0008] A moving ring, which is movably arranged in the annular seat;
[0009] The static ring is fixedly arranged at the other end of the annular seat. When the expansion material expands when encountering liquid, it pushes the dynamic ring to move until it fits with the static ring.
[0010] Furthermore, the annular seat is a sealing element.
[0011] Furthermore, the annular seat comprises: a first annular fixing seat and a second annular fixing seat which are separated, the expansion material is arranged in the first annular fixing seat, the static ring is arranged in the second annular fixing seat, and the dynamic ring is movably arranged between the expansion material and the static ring.
[0012] Furthermore, the second annular fixing seat is a sealing member.
[0013] Furthermore, it also includes: an elastic component, which is arranged between the expansion material and the dynamic ring. The expansion material expands when encountering liquid, pushing the elastic component and the dynamic ring.
[0014] Further, the elastic component comprises: a gasket and a spring;
[0015] The spacer is disposed on the expansion material;
[0016] One end of the spring is connected to the gasket, and the other end is connected to the moving ring.
[0017] Furthermore, a spring cavity is provided on the moving ring, and the spring cavity accommodates the other end of the spring.
[0018] Furthermore, a sealing cavity is provided on the dynamic ring, and a sealing ring is placed in the sealing cavity to seal the dynamic ring with an external sealed workpiece under working conditions.
[0019] According to an embodiment of the utility model, a centrifugal pump is provided, comprising a motor, a pump shaft, a pump cover, an impeller, a pump body, a first mechanical seal, and further comprising: any of the above-mentioned anti-leakage backup mechanical sealing devices, with an annular seat, a dynamic ring, and a static ring respectively sleeved on the pump shaft.
[0020] Furthermore, it also includes: a retaining spring, which is used to limit the axial movement of the annular seat along the pump shaft.
[0021] According to the anti-leakage backup mechanical seal device and centrifugal pump of the embodiment of the utility model, a double mechanical seal structure is adopted. When the original mechanical seal is worn, the backup mechanical seal automatically plays a role, greatly improving the sealing effect, and can effectively avoid property losses and safety hazards.
[0022] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of a liquid leakage-proof backup mechanical sealing device according to an embodiment of the utility model;
[0024] Figure 2 It is a schematic structural diagram of a centrifugal pump according to an embodiment of the utility model.
[0025] For ease of example, Figure 1 The installation principle diagram of the mechanical seal device for preventing leakage is applied to the centrifugal pump. Figure 2 A partial enlarged view of . DETAILED DESCRIPTION
[0026] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.
[0027] First, combine Figure 1 The invention describes a liquid leakage-proof backup mechanical seal device according to an embodiment of the utility model, which is used for mechanical seals of centrifugal pumps and the like and has a wide range of application scenarios.
[0028] like Figure 1 As shown, the anti-leakage liquid backup mechanical seal device of the embodiment of the utility model comprises: an annular seat 1, an expansion material 2, a dynamic ring 3 and a static ring 4. Among them, the expansion material 2 is arranged at one end of the annular seat 1; the dynamic ring 3 is movably arranged in the annular seat 1; the static ring 4 is fixedly arranged at the other end of the annular seat 1, and the expansion material 2 pushes the dynamic ring 3 to move until it fits with the static ring 4 after expanding when encountering liquid.
[0029] Specifically, the annular seat 1 is a sealing member, and its structure is an integral structure.
[0030] Specifically, Figure 1 As shown, the structure of the annular seat 1 can also be designed as a separated first annular fixing seat 11 and a second annular fixing seat 12, the expansion material 2 is arranged in the first annular fixing seat 11, the static ring 4 is arranged in the second annular fixing seat 12, and the dynamic ring 3 is movably arranged between the expansion material 2 and the static ring 4. In this embodiment, the second annular fixing seat 12 is also a sealing member.
[0031] Specifically, Figure 1 As shown, the anti-leakage liquid backup mechanical seal device of this embodiment also has: an elastic component 5, which is arranged between the expansion material 2 and the dynamic ring 3. When the expansion material 2 expands when encountering liquid, it will push the elastic component 5 and the dynamic ring 3 to move. In this embodiment, the elastic component 5 is composed of a gasket 51 and a spring 52, wherein the gasket 51 is arranged on the expansion material 2 to increase the force-bearing area and also ensure the stability of pushing the dynamic ring 3. One end of the spring 52 is connected to the gasket 51, and the other end is connected to the dynamic ring 3, which can ensure the uniformity of the thrust. At the same time, due to the existence of the spring 52, the sealing effect of the dynamic ring 3 and the static ring 4 can be ensured.
[0032] Specifically, Figure 1 As shown, the dynamic ring 3 is provided with a spring cavity 31, and the other end of the spring 52 is arranged in the spring cavity 31, so as to optimize the working conditions of the spring 52 and achieve the working effect. Furthermore, the dynamic ring 3 is provided with a sealing cavity 32, and a sealing ring 33 is placed in the sealing cavity 32, which is used for sealing between the dynamic ring 3 and the external sealed workpiece under working conditions, so as to improve the sealing effect.
[0033] When working, after the expansion material 2 expands when encountering liquid, it will push the gasket 51 and the spring 52, and then push the dynamic ring 3, so that the dynamic ring 3 contacts the static ring 4. Under the action of the spring 52, the contact between the dynamic ring 3 and the static ring 4 is further compacted to ensure the sealing effect and prevent liquid from leaking out of the mechanical seal.
[0034] As described above, in the anti-leakage backup mechanical seal device according to an embodiment of the present invention, a double mechanical seal structure is adopted. When the original mechanical seal is worn, the backup mechanical seal automatically plays a role, which greatly increases the sealing effect and can effectively avoid property losses and safety hazards.
[0035] The above combined with Figure 1 The invention describes a liquid leakage-proof backup mechanical seal device according to an embodiment of the invention. Further, the invention can also be applied to a centrifugal pump.
[0036] like Figure 2 As shown, the centrifugal pump of the embodiment of the present invention has a motor 6, a pump shaft 7, a pump cover 8, an impeller 9, a pump body 10 and a first mechanical seal 101, and also has the anti-leakage backup mechanical sealing device of the above embodiment, wherein the annular seat 1, the dynamic ring 3 and the static ring 4 are respectively sleeved on the pump shaft 7.
[0037] Further, if Figure 1 , 2 As shown, it also includes: a retaining spring 102, which is used to limit the axial movement of the annular seat 1 along the pump shaft 7.
[0038] Specifically, the impeller 9 is fixed to the pump shaft 7 by a nut and a first mechanical seal 101, a new leakage-proof backup mechanical seal device is added in the pump cover 8, a retaining ring 102 is installed on the pump shaft 7, an annular seat 1 is installed on the retaining ring 102, and the static ring 4 and the annular seat 1 or the second annular fixed seat 12 and the mechanical seal cover plate are installed on the pump cover 8 by bolts.
[0039] When working, the first mechanical seal 101 is a common mechanical seal to prevent the liquid in the pump chamber from leaking out. The anti-leakage backup mechanical seal device is a spare mechanical seal. When the pump is running, the dynamic ring 3 and the static ring 4 are not in contact with friction and wear. If the first mechanical seal 101 is normally worn and replaced regularly, the spare mechanical seal will not participate in the sealing function. When the first mechanical seal 101 fails, the spare mechanical seal is automatically started. When the first mechanical seal 101 inside the pump chamber fails and leaks, the external spare mechanical seal expansion material 2 expands when it contacts the liquid, pushing the gasket 51, the spring 52 and the dynamic ring 3, so that the dynamic ring 3 contacts the static ring 4, thereby preventing the liquid from leaking out of the mechanical seal.
[0040] As described above, in the centrifugal pump of the embodiment of the utility model, a double mechanical seal structure is adopted. When the original mechanical seal is worn, the backup mechanical seal automatically plays a role, which greatly increases the sealing effect and can effectively avoid property losses and safety hazards.
[0041] Above, refer to Figure 1~2The invention describes a liquid leakage prevention backup mechanical seal device and a centrifugal pump according to an embodiment of the utility model. A double mechanical seal structure is adopted. When the original mechanical seal is worn, the backup mechanical seal automatically plays a role, greatly improving the sealing effect, and can effectively avoid property losses and safety hazards.
[0042] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0043] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.
Claims
1. A liquid leakage-proof backup mechanical sealing device, characterized in that: Include: Ring seat; an expansion material, the expansion material being disposed at one end of the annular seat; A moving ring, the moving ring is movably arranged in the annular seat; The static ring is fixedly arranged at the other end of the annular seat. After the expansion material expands when encountering liquid, it pushes the dynamic ring to move until it fits with the static ring.
2. The anti-leakage liquid backup mechanical sealing device according to claim 1, characterized in that: The annular seat is a sealing member.
3. The anti-leakage liquid backup mechanical sealing device according to claim 1, characterized in that: The annular seat comprises: a first annular fixing seat and a second annular fixing seat which are separated, the expansion material is arranged in the first annular fixing seat, the static ring is arranged in the second annular fixing seat, and the dynamic ring is movably arranged between the expansion material and the static ring.
4. The anti-leakage backup mechanical seal device according to claim 3, characterized in that: The second annular fixing seat is a sealing member.
5. The anti-leakage liquid backup mechanical sealing device according to any one of claims 1 to 4, characterized in that: It also includes: an elastic component, which is arranged between the expansion material and the dynamic ring. The expansion material expands when encountering liquid, pushing the elastic component and the dynamic ring.
6. The anti-leakage backup mechanical seal device according to claim 5, characterized in that: The elastic component comprises: a gasket and a spring; The gasket is disposed on the expansion material; One end of the spring is connected to the gasket, and the other end is connected to the moving ring.
7. The anti-leakage backup mechanical seal device according to claim 6, characterized in that: The moving ring is provided with a spring cavity, and the spring cavity accommodates the other end of the spring.
8. The anti-leakage backup mechanical seal device according to claim 1 or 7, characterized in that: The dynamic ring is provided with a sealing cavity, in which a sealing ring is placed for sealing between the dynamic ring and an external sealed workpiece under working conditions.
9. A centrifugal pump, comprising a motor, a pump shaft, a pump cover, an impeller, a pump body, and a first mechanical seal, characterized in that: It also comprises: the anti-leakage backup mechanical sealing device as described in any one of claims 1 to 8, wherein the annular seat, the dynamic ring and the static ring are respectively sleeved on the pump shaft.
10. The centrifugal pump according to claim 9, characterized in that: It also includes a retaining spring, which is used to limit the axial movement of the annular seat along the pump shaft.