Mechanical seal wear-resistant structure

Abstract

The utility model relates to a mechanical seal wear-resistant structure, and relates to the technical field of water pumps, the mechanical seal wear-resistant structure comprises a seat body fixedly connected with a pump body, the end face of the seat body is provided with a positioning groove for mounting a mechanical seal, an oil seal seat is fixed on the seat body, a lubricating cavity and an oil seal groove are arranged in the oil seal seat, and two ends of the lubricating cavity are respectively communicated with the positioning groove and the oil seal groove. And an oil injection hole communicated with the lubricating cavity is formed in the outer wall of the oil seal seat. A mechanical seal is installed in the positioning groove, a framework oil seal is installed in the oil seal groove, a rotating shaft of a pump penetrates through the mechanical seal, the lubricating cavity and the framework oil seal, grease is injected into the lubricating cavity through an oil injection hole, and then the oil injection hole is sealed through a plug screw. With the rotation of the rotating shaft, grease in the lubricating cavity can be coated between the movable ring and the static ring of the mechanical seal to achieve a lubricating effect, so that dry grinding of the mechanical seal is avoided when the pump is in trial operation or the interior of the pump cavity is lack of water, the mechanical seal is not easy to damage, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and in particular to a wear-resistant mechanical seal structure. Background Art

[0002] The pipeline pump is a type of single-suction single-stage or multi-stage centrifugal pump with a vertical structure. Because its inlet and outlet are in the same straight line and have the same inlet and outlet diameters, it resembles a section of pipeline and can be installed at any position of the pipeline, so it is named a pipeline pump. The self-priming sewage pump integrates self-priming and sewage discharge. Through the unique design of the pump body and impeller flow channel, it can self-prime the sewage without installing a bottom valve and pouring water. By setting up filtering and cutting structures, garbage in the sewage is prevented from clogging the pump body. It is widely used in municipal sewage projects, river and pond pumping, factories and other occasions.

[0003] Pipeline pumps and self-priming sewage pumps pump water through the rotation of the impeller. The impeller is fixed on the rotating shaft, and the rotating shaft is rotatably connected to the pump body through bearings. The rotating connection between the two is sealed by installing a mechanical seal to avoid leakage.

[0004] With respect to the above-mentioned related technologies, the inventors believe that when the pump is in trial operation or when there is a lack of water inside the pump chamber, dry grinding of the mechanical seal may occur, which may easily lead to damage. Utility Model Content

[0005] The present application provides a mechanical seal wear-resistant structure, which can provide continuous lubrication for the mechanical seal, avoid dry grinding of the mechanical seal, and thus increase the service life of the mechanical seal.

[0006] The present application provides a mechanical seal wear-resistant structure, which adopts the following technical solution:

[0007] A mechanical seal wear-resistant structure comprises a seat body fixedly connected to a pump body, the end surface of the seat body is provided with a positioning groove for installing a mechanical seal, an oil seal seat is fixed on the seat body, a lubrication cavity and an oil seal groove are provided in the oil seal seat, the two ends of the lubrication cavity are respectively connected with the positioning groove and the oil seal groove, and the outer wall of the oil seal seat is provided with an oil filling hole connected with the lubrication cavity.

[0008] By adopting the above technical solution, a mechanical seal is installed in the positioning groove, a skeleton oil seal is installed in the oil seal groove, and grease is injected into the lubrication cavity through the oil filling hole. As the shaft rotates, the grease in the lubrication cavity will be applied between the dynamic ring and the static ring of the mechanical seal, playing a lubricating effect, thereby avoiding dry grinding of the mechanical seal when the pump is in trial operation or when there is a lack of water in the pump cavity. Therefore, the mechanical seal is not easily damaged and its service life is extended.

[0009] Optionally, the oil seal seat is fixed integrally with the seat body.

[0010] By adopting the above technical solution, the integrity is improved and the oil seal seat is prevented from loosening.

[0011] Optionally, the oil seal seat and the seat body are fixed by bolts.

[0012] By adopting the above technical solution and providing a detachable oil seal seat, the oil seal seat can be adapted to the seat body of an existing ordinary pump for use through modification, thereby expanding the scope of application.

[0013] Optionally, a sealing ring is provided between the oil seal seat and the seat body for sealing.

[0014] By adopting the above technical solution and providing a sealing ring, the grease in the lubrication cavity is prevented from leaking out from the contact position between the oil seal seat and the seat body.

[0015] Optionally, the end surface of the oil seal seat is provided with a groove for installing a sealing ring.

[0016] By adopting the above technical solution, the embedded groove has a positioning effect for the sealing ring.

[0017] Optionally, the seat body includes an annular boss, the oil seal seat abuts against the boss through an end face, and the outer diameter of the oil seal seat is greater than the outer diameter of the boss.

[0018] By adopting the above technical solution, the periphery of the oil seal seat is made to protrude from the periphery of the boss, so that a force point is provided when a person wants to remove the oil seal seat, thereby preventing the oil seal seat from slipping and being difficult to remove.

[0019] Optionally, the seat body is a part of the pump body, and the seat body is fixed integrally with the pump body.

[0020] By adopting the above technical solution, this is another usage scenario of the seat.

[0021] Optionally, the oil filling hole is a threaded hole.

[0022] By adopting the above technical solution, after the screw plug is screwed into the oil filling hole, the grease in the lubrication cavity can be prevented from leaking out through the oil filling hole.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The grease in the lubrication chamber will be applied between the dynamic ring and the static ring of the mechanical seal to achieve lubrication, thereby preventing the mechanical seal from dry grinding during the test run of the pump or when there is a lack of water in the pump chamber. Therefore, the mechanical seal is not easily damaged and its service life is extended.

[0025] 2. By providing a detachable oil seal seat, the oil seal seat can be adapted to the seat body of an existing ordinary pump for use. A threaded hole is directly drilled on the seat body of the existing pump, and the oil seal seat can be fixed and installed by bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of a mechanical seal wear-resistant structure of embodiment 1;

[0027] Figure 2 It is an installation diagram of the first embodiment;

[0028] Figure 3 is a cross-sectional view of a mechanical seal wear-resistant structure of the second embodiment;

[0029] Figure 4 It is the installation diagram of the second embodiment.

[0030] Explanation of the reference numerals: 1. seat body; 11. positioning groove; 2. oil seal seat; 21. lubrication chamber; 22. oil seal groove; 23. oil filling hole; 12. boss; 3. sealing ring; 24. embedded groove. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings.

[0032] Embodiment 1:

[0033] Reference Figure 1 and Figure 2 The present embodiment discloses a mechanical seal wear-resistant structure, comprising a seat body 1 fixedly connected to a pump body, a positioning groove 11 for installing a mechanical seal is provided on the end surface of the seat body 1, an oil seal seat 2 is fixed on the seat body 1, and the oil seal seat 2 is located on the side of the seat body 1 away from the positioning groove 11. The oil seal seat 2 is fixed integrally with the seat body 1, wherein the integral fixing can be an integral molding fixing, i.e., an integral and inseparable shape formed by casting or machining, or an integral fixing structure formed by welding.

[0034] The oil seal seat 2 is provided with a lubrication cavity 21 and an oil seal groove 22. The lubrication cavity 21 is located between the positioning groove 11 and the oil seal groove 22. The two ends of the lubrication cavity 21 are respectively connected with the positioning groove 11 and the oil seal groove 22. The outer wall of the oil seal seat 2 is provided with an oil injection hole 23 connected with the lubrication cavity 21. The lubrication cavity 21 is used to store lubricating oil or grease, and the grease is injected through the oil injection hole 23. The oil seal groove 22 is used to install the skeleton oil seal.

[0035] The oil filling hole 23 is a threaded hole, through which the screw plug is easily installed, and the self-locking effect of the threaded connection prevents the screw plug from spontaneously detaching, thereby improving the stability of the closed oil filling hole 23. After the screw plug is turned to open the oil filling hole 23, grease can be injected into the lubrication cavity 21. After the screw plug is screwed into the oil filling hole 23, the grease in the lubrication cavity 21 can be prevented from leaking out through the oil filling hole 23.

[0036] The seat body 1 of this embodiment is a detachable structure with the pump body. The seat body 1 is used as a connector to connect the pump body and the motor, or as a part of the water pump that contacts the ground. The side of the seat body 1 used to install the mechanical seal forms a part of the pump chamber, which contacts the liquid transported by the pump. The mechanical seal sleeve is outside the rotating shaft, and a rotating seal is established between the rotating shaft and the seat body 1.

[0037] The implementation principle of the embodiment of the present application is as follows: a mechanical seal is installed in the positioning groove 11, a skeleton oil seal is installed in the oil seal groove 22, the rotating shaft of the pump passes through the mechanical seal, the lubrication cavity 21, and the skeleton oil seal, grease is injected into the lubrication cavity 21 through the oil injection hole 23, and then the oil injection hole 23 is closed with a screw plug. Since the mechanical seal and the skeleton oil seal respectively establish a rotating seal with the rotating shaft, the grease in the lubrication cavity 21 is not easy to leak out.

[0038] As the shaft rotates, the grease in the lubrication chamber 21 will be applied between the dynamic ring and the static ring of the mechanical seal to achieve lubrication, thereby preventing dry grinding of the mechanical seal during trial operation of the pump or when there is a lack of water in the pump chamber. Therefore, the mechanical seal is not easily damaged, thereby extending its service life.

[0039] Embodiment 2:

[0040] Reference Figure 3 and Figure 4 The difference between the second embodiment and the first embodiment is that the oil seal seat 2 is an independent object, and the oil seal seat 2 is fixed to the seat body 1 by bolts. A plurality of bolts are provided, and the bolts penetrate the oil seal seat 2 and are threadedly connected to the seat body 1.

[0041] The oil seal seat 2 is annular, and the seat body 1 includes an annular boss 12. The axis of the boss 12 coincides with the positioning groove 11. The oil seal seat 2 abuts against the boss 12 through the end face, and the outer diameter of the oil seal seat 2 is larger than the outer diameter of the boss 12. This arrangement makes the outer periphery of the oil seal seat 2 protrude from the outer periphery of the boss 12, so that when personnel want to remove the oil seal seat 2, there is a force point to avoid slipping and difficulty in removing the oil seal seat 2. After the oil seal seat 2 is removed, it is convenient to perform maintenance and cleaning, and it is convenient to replace the skeleton oil seal above.

[0042] A sealing ring 3 is provided at the contact position between the oil seal seat 2 and the seat body 1. The side of the sealing ring 3 facing the seat body 1 is specifically abutted against the boss 12. The oil seal seat 2 and the seat body 1 are sealed by the sealing ring 3. The end surface of the oil seal seat 2 is provided with an embedding groove 24 for installing the sealing ring 3. The embedding groove 24 has a positioning effect for the sealing ring 3.

[0043] The implementation principle of the second embodiment is as follows: by providing a detachable oil seal seat 2, the oil seal seat 2 can be adapted to the seat body 1 of an existing ordinary pump for use, and a threaded hole is directly drilled on the seat body 1 of the existing pump, and the oil seal seat 2 can be fixed and installed by bolts. That is, the existing pump can be transformed into a structure with a lubrication cavity 21 by modification, thereby expanding the scope of application.

[0044] Embodiment three:

[0045] The difference between the third embodiment and the first and second embodiments is that the seat body 1 is a part of the pump body, and the seat body 1 is fixed integrally with the pump body, that is, the seat body 1 cannot be separated from the pump body.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mechanical seal wear-resistant structure, characterized in that: The invention comprises a seat body (1) fixedly connected to a pump body, the end surface of the seat body (1) being provided with a positioning groove (11) for installing a mechanical seal, an oil seal seat (2) being fixed on the seat body (1), a lubrication cavity (21) and an oil seal groove (22) being provided in the oil seal seat (2), the two ends of the lubrication cavity (21) being respectively connected with the positioning groove (11) and the oil seal groove (22), and an oil filling hole (23) being connected with the lubrication cavity (21) being provided on the outer wall of the oil seal seat (2).

2. The mechanical seal wear-resistant structure according to claim 1, characterized in that: The oil seal seat (2) is fixed integrally with the seat body (1).

3. The mechanical seal wear-resistant structure according to claim 1, characterized in that: The oil seal seat (2) and the seat body (1) are fixed by bolts.

4. The mechanical seal wear-resistant structure according to claim 3, characterized in that: The oil seal seat (2) and the seat body (1) are sealed by providing a sealing ring (3).

5. The mechanical seal wear-resistant structure according to claim 4, characterized in that: The end surface of the oil seal seat (2) is provided with an embedding groove (24) for installing the sealing ring (3).

6. The mechanical seal wear-resistant structure according to claim 1, characterized in that: The seat body (1) comprises an annular boss (12), the oil seal seat (2) abuts against the boss (12) via an end face, and the outer diameter of the oil seal seat (2) is greater than the outer diameter of the boss (12).

7. The mechanical seal wear-resistant structure according to claim 1, characterized in that: The seat body (1) is a part of the pump body, and the seat body (1) is fixed integrally with the pump body.

8. The mechanical seal wear-resistant structure according to claim 1, characterized in that: The oil filling hole (23) is a threaded hole.

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