Mechanical seal dry running self-lubricating structure

Abstract

The utility model belongs to the technical field of mechanical seals, and particularly relates to a mechanical seal dry running self-lubricating structure which comprises a mechanical seal arranged between an impeller and a connecting body, the connecting body is sleeved on a rotating shaft, the rotating shaft penetrates through the connecting body to be connected with the impeller, and an oil seal for sealing a gap between the connecting body and the rotating shaft is sleeved on the rotating shaft. The left end of the mechanical seal is sealed with the impeller, the right end of the mechanical seal is sealed with the connector, and a sealing cavity is formed between the mechanical seal and the rotating shaft and filled with lubricating oil. When the water pump is in dry running, the mechanical seal can be effectively lubricated and cooled, and the mechanical seal is prevented from losing efficacy due to dry grinding.

Description

Technical field:

[0001] The utility model belongs to the technical field of mechanical seals, in particular to a mechanical seal dry-running self-lubricating structure. Background technology:

[0002] like Figure 1 As shown, the swimming pool pump includes a pump body 1, an impeller 2 arranged in the pump body 1, and a connector 4 connecting the pump body 1 and the motor 3. The rotating shaft 5 of the motor 3 passes through the connector 4 to connect the impeller 2. A mechanical seal 6 sleeved on the rotating shaft 5 is provided between the impeller 2 and the connector 4. The mechanical seal 6 is lubricated and heat-dissipated by the water in the pump body 1.

[0003] The disadvantage of the existing swimming pool pump is that when the swimming pool pump is running, the filter screen at the water inlet end is blocked and not cleaned in time, resulting in dry operation without water in the pump body, and the mechanical seal cannot be effectively lubricated and dissipated, resulting in damage and failure of the mechanical seal. Summary of the invention:

[0004] The utility model aims to provide a mechanical seal dry-running self-lubricating structure, which can effectively lubricate and cool the mechanical seal when the water pump is dry-running, and prevent the mechanical seal from failing due to dry grinding.

[0005] The utility model is achieved in this way:

[0006] A mechanical seal dry-running self-lubricating structure comprises a mechanical seal arranged between an impeller and a connector, wherein the connector is sleeved on a rotating shaft, and the rotating shaft passes through the connector and is connected to the impeller, and an oil seal is sleeved on the rotating shaft to seal the gap between the connector and the rotating shaft, the left end of the mechanical seal is sealed with the impeller, and the right end is sealed with the connector, and a sealed chamber is formed between the mechanical seal and the rotating shaft, and lubricating oil is arranged in the sealed chamber.

[0007] In the above-mentioned mechanical seal dry-running self-lubricating structure, the mechanical seal includes a stationary ring assembly arranged in the impeller and a dynamic ring assembly arranged in the connecting body, the lubricating oil is provided between the stationary ring assembly and the impeller, and between the stationary ring assembly and the rotating shaft, and the lubricating oil is provided between the dynamic ring assembly and the rotating shaft.

[0008] In the above-mentioned mechanical seal dry-running self-lubricating structure, the end face of the impeller close to the connecting body is concave to form an annular groove for installing the stationary ring assembly, and the stationary ring assembly includes a stationary ring and an L-shaped sealing gasket, and the L-shaped sealing gasket is arranged around the outer periphery of the stationary ring, and the L-shaped sealing gasket seals the gap between the stationary ring and the outer side wall of the annular groove, and the gap between the stationary ring and the inner end face of the annular groove, and the lubricating oil is provided between the L-shaped sealing gasket and the inner side wall of the annular groove, between the stationary ring and the inner side wall of the annular groove, and between the stationary ring and the rotating shaft.

[0009] In the above-mentioned mechanical seal dry-running self-lubricating structure, the material of the stationary ring is silicon carbide, and the material of the L-shaped sealing gasket is nitrile rubber.

[0010] In the above-mentioned mechanical seal dry-running self-lubricating structure, the end surface of the connector close to the impeller is concave to form an installation groove 1 for installing the dynamic ring assembly and an installation groove 2 for installing the oil seal. The dynamic ring assembly includes a dynamic ring, a mounting seat, a spring, a left spring seat, a right spring seat, a bellows and a sealing seat sleeve. The right end of the mounting seat is arranged in the installation groove 1, the sealing seat sleeve is L-shaped, and the gap between the sealing mounting seat and the outer side wall of the mounting groove 1, and the gap between the mounting seat and the inner end surface of the mounting groove 1, the left end of the mounting seat is sleeved with the dynamic ring, the bellows is arranged between the dynamic ring and the right end of the mounting seat, the spring is sleeved outside the bellows, the left end of the spring is in contact with the left end of the bellows through the left spring seat, and the right end is in contact with the right end of the bellows through the right spring seat, the left end face of the dynamic ring is in contact and sealed with the static ring assembly, and the lubricating oil is provided between the dynamic ring and the rotating shaft, between the mounting seat and the rotating shaft, and between the sealing seat sleeve and the rotating shaft.

[0011] In the above-mentioned mechanical seal dry-running self-lubricating structure, the connector has a convex edge protruding toward the side away from the impeller, and the convex edge is located on the right side of the second mounting groove.

[0012] In the above-mentioned mechanical seal dry-running self-lubricating structure, the material of the moving ring is graphite, and the material of the sealing seat sleeve is nitrile rubber.

[0013] In the above-mentioned mechanical seal dry-running self-lubricating structure, the oil seal is a skeleton oil seal or a rotating shaft lip oil seal.

[0014] The outstanding advantages of the utility model compared with the prior art are:

[0015] The utility model forms a sealing chamber between the mechanical seal and the rotating shaft, and lubricating oil is arranged in the sealing chamber. When the water pump is running dry, the lubricating oil can effectively lubricate and cool the mechanical seal, thereby preventing the mechanical seal from failing due to dry grinding and effectively extending the service life of the mechanical seal. Description of the drawings:

[0016] Figure 1 is a cross-sectional view of the prior art;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 yes Figure 2 A magnified image of point A;

[0019] Figure 4 It is a cross-sectional view of the utility model without lubricating oil;

[0020] Figure 5 yes Figure 4 The enlarged view of point B;

[0021] Figure 6 It is a cross-sectional view of the utility model without lubricating oil and mechanical seal;

[0022] Figure 7 yes Figure 6 Enlarged view of point C.

[0023] Reference numerals:

[0024] Figure 1 In: 1. Pump body; 2. Impeller; 3. Motor; 4. Connector; 5. Rotating shaft; 6. Mechanical seal.

[0025] Figure 2-7 In: 11, impeller; 12, connector; 13, mechanical seal; 13a, stationary ring; 13b, L-shaped sealing gasket; 13c, moving ring; 13d, mounting seat; 13e, spring; 13f, left spring seat; 13g, right spring seat; 13h, bellows; 13i, sealing seat sleeve; 14, rotating shaft; 15, oil seal; 16, sealing chamber; 17, lubricating oil; 18, annular groove; 19, mounting groove one; 20, mounting groove two; 21, convex edge. Specific implementation method:

[0026] The present invention is further described below with reference to specific embodiments. Figure 2 —7:

[0027] A mechanical seal dry-running self-lubricating structure includes a mechanical seal 13 arranged between an impeller 11 and a connector 12, wherein the connector 12 is mounted on a rotating shaft 14, and the rotating shaft 14 passes through the connector 12 and is connected to the impeller 11, and an oil seal 15 is mounted on the rotating shaft 14 to seal the gap between the connector 12 and the rotating shaft 14, the left end of the mechanical seal 13 is sealed with the impeller 11, and the right end is sealed with the connector 12, and a sealed chamber 16 is formed between the mechanical seal 13 and the rotating shaft 14, and lubricating oil 17 is provided in the sealed chamber 16.

[0028] The installation process of the lubricating oil 17 of the utility model is as follows: first, the connector 12 is mounted on the rotating shaft 14, and then the oil seal 15 is installed in the connector 12 and mounted on the rotating shaft 14, and then the dynamic ring assembly of the mechanical seal 13 is installed in the connector 12, and then the lubricating oil 17 is poured between the dynamic ring assembly of the mechanical seal 13 and the rotating shaft 14, and then the stationary ring assembly of the mechanical seal 13 is installed on the impeller 11, and finally the impeller 11 is screwed into the rotating shaft 14.

[0029] like Figure 2-5As shown, the utility model forms a sealing chamber 16 between the mechanical seal 13 and the rotating shaft 14, and a lubricating oil 17 is arranged in the sealing chamber 16. When the water pump runs dry, the lubricating oil 17 can effectively lubricate and cool the mechanical seal 13, prevent the mechanical seal 13 from failing due to dry grinding, and effectively extend the service life of the mechanical seal 13.

[0030] The structure of mechanical seal 13: Figure 2-5 As shown, the mechanical seal 13 includes a stationary ring assembly arranged in the impeller 11 and a dynamic ring assembly arranged in the connecting body 12, and the lubricating oil 17 is provided between the stationary ring assembly and the impeller 11, and between the stationary ring assembly and the rotating shaft 14, and the lubricating oil 17 is provided between the dynamic ring assembly and the rotating shaft 14.

[0031] The structure and installation structure of the stationary ring assembly: Figure 2-7 As shown, the end surface of the impeller 11 close to the connecting body 12 is concave to form an annular groove 18 for installing the stationary ring assembly, and the stationary ring assembly includes a stationary ring 13a and an L-shaped sealing gasket 13b, and the L-shaped sealing gasket 13b is arranged around the outer periphery of the stationary ring 13a, and the L-shaped sealing gasket 13b seals the gap between the stationary ring 13a and the outer side wall of the annular groove 18, and the gap between the stationary ring 13a and the inner end surface of the annular groove 18, and the lubricating oil 17 is provided between the L-shaped sealing gasket 13b and the inner side wall of the annular groove 18, between the stationary ring 13a and the inner side wall of the annular groove 18, and between the stationary ring 13a and the rotating shaft 14. The structure is simple, easy to install, and the sealing effect between the stationary ring assembly and the impeller 11 is good, which effectively prevents the lubricating oil 17 from leaking.

[0032] Preferably, the material of the stationary ring 13a is silicon carbide, and the material of the L-shaped sealing gasket 13b is nitrile rubber.

[0033] The structure and installation structure of the dynamic ring assembly: Figure 2-7As shown, the end surface of the connecting body 12 close to the impeller 11 is concave to form a mounting groove 19 for mounting the dynamic ring assembly and a mounting groove 20 for mounting the oil seal 15. The dynamic ring assembly includes a dynamic ring 13c, a mounting seat 13d, a spring 13e, a left spring seat 13f, a right spring seat 13g, a bellows 13h and a sealing seat sleeve 13i. The right end of the mounting seat 13d is arranged in the mounting groove 19, and the sealing seat sleeve 13i is L-shaped, and the gap between the sealing mounting seat 13d and the outer side wall of the mounting groove 19, and the gap between the mounting seat 13d and the inner end surface of the mounting groove 19 are The left end of the mounting seat 13d is sleeved with the moving ring 13c, the bellows 13h is arranged between the moving ring 13c and the right end of the mounting seat 13d, the spring 13e is sleeved outside the bellows 13h, the left end of the spring 13e abuts against the left end of the bellows 13h through the left spring seat 13f, and the right end abuts against the right end of the bellows 13h through the right spring seat 13g, the left end face of the moving ring 13c abuts against the stationary ring assembly and seals, and the lubricating oil 17 is arranged between the moving ring 13c and the rotating shaft 14, between the mounting seat 13d and the rotating shaft 14, and between the sealing seat sleeve 13i and the rotating shaft 14. The structure is simple, easy to install, and the sealing effect of the moving ring assembly and the connecting body 12 is good, which effectively prevents the lubricating oil 17 from leaking.

[0034] In order to enhance the strength of the connector 12 and facilitate the processing of the second mounting groove 20 , the connector 12 has a convex edge 21 protruding toward the side away from the impeller 11 , and the convex edge 21 is located on the right side of the second mounting groove 20 .

[0035] Preferably, the material of the moving ring 13c is graphite, and the material of the sealing seat sleeve 13i is nitrile rubber.

[0036] Preferably, the oil seal 15 is a skeleton oil seal or a rotary shaft lip oil seal. In this embodiment, the oil seal 15 is a skeleton oil seal.

[0037] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A mechanical seal dry-running self-lubricating structure, comprising a mechanical seal (13) arranged between an impeller (11) and a connector (12), wherein the connector (12) is sleeved on a rotating shaft (14), and the rotating shaft (14) passes through the connector (12) and is connected to the impeller (11), characterized in that: The rotating shaft (14) is provided with an oil seal (15) for sealing the gap between the connecting body (12) and the rotating shaft (14); the left end of the mechanical seal (13) is sealed with the impeller (11), and the right end is sealed with the connecting body (12); a sealed chamber (16) is formed between the mechanical seal (13) and the rotating shaft (14); and lubricating oil (17) is provided in the sealed chamber (16).

2. A mechanical seal dry-running self-lubricating structure according to claim 1, characterized in that: The mechanical seal (13) comprises a stationary ring assembly arranged in the impeller (11) and a dynamic ring assembly arranged in the connecting body (12); the lubricating oil (17) is arranged between the stationary ring assembly and the impeller (11) and between the stationary ring assembly and the rotating shaft (14); and the lubricating oil (17) is arranged between the dynamic ring assembly and the rotating shaft (14).

3. A mechanical seal dry-running self-lubricating structure according to claim 2, characterized in that: The end surface of the impeller (11) close to the connecting body (12) is concave to form an annular groove (18) for installing a stationary ring assembly. The stationary ring assembly includes a stationary ring (13a) and an L-shaped sealing gasket (13b). The L-shaped sealing gasket (13b) is arranged around the outer periphery of the stationary ring (13a). The L-shaped sealing gasket (13b) seals the gap between the stationary ring (13a) and the outer side wall of the annular groove (18), and the gap between the stationary ring (13a) and the inner end surface of the annular groove (18). The lubricating oil (17) is provided between the L-shaped sealing gasket (13b) and the inner side wall of the annular groove (18), between the stationary ring (13a) and the inner side wall of the annular groove (18), and between the stationary ring (13a) and the rotating shaft (14).

4. A mechanical seal dry-running self-lubricating structure according to claim 3, characterized in that: The material of the stationary ring (13a) is silicon carbide, and the material of the L-shaped sealing gasket (13b) is nitrile rubber.

5. The mechanical seal dry-running self-lubricating structure according to claim 2, characterized in that: The end surface of the connecting body (12) close to the impeller (11) is concave to form a mounting groove 1 (19) for mounting a dynamic ring assembly and a mounting groove 2 (20) for mounting an oil seal (15). The dynamic ring assembly comprises a dynamic ring (13c), a mounting seat (13d), a spring (13e), a left spring seat (13f), a right spring seat (13g), a bellows (13h) and a sealing seat sleeve (13i). The right end of the mounting seat (13d) is arranged in the mounting groove 1 (19). The sealing seat sleeve (13i) is L-shaped. The gap between the sealing mounting seat (13d) and the outer side wall of the mounting groove 1 (19) and the gap between the mounting seat (13d) and the inner end surface of the mounting groove 1 (19) are formed. The left end of the mounting seat (13d) is sleeved with the moving ring (13c), the bellows (13h) is provided between the moving ring (13c) and the right end of the mounting seat (13d), the spring (13e) is sleeved outside the bellows (13h), the left end of the spring (13e) abuts against the left end of the bellows (13h) through the left spring seat (13f), and the right end abuts against the right end of the bellows (13h) through the right spring seat (13g), the left end face of the moving ring (13c) abuts against the stationary ring assembly for sealing, and the lubricating oil (17) is provided between the moving ring (13c) and the rotating shaft (14), between the mounting seat (13d) and the rotating shaft (14), and between the sealing seat sleeve (13i) and the rotating shaft (14).

6. A mechanical seal dry-running self-lubricating structure according to claim 5, characterized in that: The connector (12) has a convex edge (21) protruding from the side away from the impeller (11), and the convex edge (21) is located on the right side of the second mounting groove (20).

7. The mechanical seal dry-running self-lubricating structure according to claim 5, characterized in that: The material of the moving ring (13c) is graphite, and the material of the sealing seat sleeve (13i) is nitrile rubber.

8. The mechanical seal dry-running self-lubricating structure according to claim 1, characterized in that: The oil seal (15) is a skeleton oil seal or a rotary shaft lip oil seal.

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