Dry gas mechanical seal device for bearing housing

Abstract

The utility model discloses a kind of dry gas mechanical sealing devices for bearing box, belong to mechanical seal field, including dynamic ring sealing assembly and static ring sealing assembly, dynamic ring sealing assembly is set on shaft and rotates synchronously with shaft, static ring sealing assembly is set on the outside of bearing box, the end face of dynamic ring sealing assembly and the end face of static ring sealing assembly are a pair of friction pairs;Dynamic ring sealing assembly includes transmission seat, transmission seat is set on shaft, and the side of transmission seat is provided with dynamic ring;Static ring sealing assembly includes flange cover, the side of flange cover is provided with static ring, and small spring is arranged between static ring and flange cover;The end face of dynamic ring and the end face of static ring are a pair of friction pairs.The utility model provides end face closing force sealing lubricating oil by small spring elastic force when equipment stops, T type dynamic ring groove on dynamic ring will push away dynamic and static ring end face when equipment runs, form rigid air mould, guarantee that end face will not wear, prolong the service life of machine seal, save user maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seals, and in particular to a dry gas mechanical seal device for bearing housings. Background Technology

[0002] Currently, in the petroleum and petrochemical industries, the bearing housings of pumps and other moving equipment are equipped with contact mechanical seals. These seals work by sealing the lubricating oil in the bearing housing through a sealing end face and an auxiliary sealing ring. Existing mechanical seals are mostly labyrinth comb-type or magnetic oil seals. However, over time, increased wear on the sealing end face leads to leakage, necessitating seal replacement. Therefore, based on the above analysis of mechanical seal types, the disadvantages of using labyrinth comb-type or magnetic oil seals include a short service life and frequent installation and disassembly. This increases the frequency of pump disassembly and maintenance, raising maintenance costs and impacting normal production. Utility Model Content

[0003] The purpose of this invention is to provide a dry gas mechanical seal device for bearing housings, which solves the problems of short service life, frequent installation and disassembly, and high maintenance costs of existing sealing devices.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model discloses a dry gas mechanical seal device for bearing housing, comprising a dynamic ring seal assembly and a stationary ring seal assembly. The dynamic ring seal assembly is mounted on a shaft and rotates synchronously with the shaft, while the stationary ring seal assembly is mounted on the outside of the bearing housing. The end faces of the dynamic ring seal assembly and the stationary ring seal assembly form a pair of friction pairs.

[0006] The dynamic ring sealing assembly includes a transmission seat, which is disposed on the shaft, and a dynamic ring is disposed on the side of the transmission seat near the bearing housing;

[0007] The stationary ring sealing assembly includes a flange cover, which is disposed on the outside of the bearing housing. A stationary ring is disposed on the side of the flange cover near the transmission seat, and a small spring is disposed between the stationary ring and the flange cover.

[0008] The end face of the moving ring and the end face of the stationary ring form a friction pair.

[0009] Furthermore, the transmission seat is provided with a transmission pin, and the moving ring is provided with a first mounting groove that matches the transmission pin on the side near the transmission seat.

[0010] Furthermore, the moving ring has several moving ring grooves on the side near the stationary ring, and these grooves are evenly distributed circumferentially.

[0011] Furthermore, the cross-section of the moving ring groove is set to a T-shape.

[0012] Furthermore, a second mounting groove matching the small spring is provided on the side of the stationary ring near the flange cover.

[0013] Furthermore, the transmission seat is connected to the shaft via a positioning screw.

[0014] Furthermore, a second O-ring is provided between the transmission seat and the shaft.

[0015] Furthermore, a first O-ring is provided between the moving ring and the transmission seat.

[0016] Furthermore, a third O-ring is provided between the stationary ring and the flange cover.

[0017] Furthermore, the flange cover is connected to the bearing housing by screws, a gasket is provided between the flange cover and the bearing housing, and a retaining ring is provided on the side of the flange cover away from the bearing housing for limiting the position of the stationary ring.

[0018] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0019] The mechanical seal structure described in this utility model effectively solves the problems of low service life and high maintenance cost of bearing housing contact mechanical seals. By setting a T-shaped groove on the rotating ring and a small spring on the stationary ring, the spring force provides end face closing force to seal the lubricating oil when the equipment is stopped. When the equipment is running, the T-shaped groove on the rotating ring pushes the end faces of the rotating and stationary rings apart to form a rigid air mold, ensuring that the end faces will not wear. Moreover, the design of the T-shaped groove can be applied to any rotation direction, extending the service life of the mechanical seal and saving users maintenance costs. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the dry gas mechanical seal device for bearing housings according to this utility model;

[0022] Figure 2 This is a schematic diagram of the moving ring structure in this utility model;

[0023] Figure 3 yes Figure 2 Schematic diagram of the lateral structure;

[0024] Figure 4 This is a schematic diagram of the stationary ring structure in this utility model;

[0025] Figure 5This is a schematic diagram of the flange cover structure in this utility model;

[0026] Figure 6 This is a schematic diagram of the small spring structure in this utility model;

[0027] Figure 7 This is a schematic diagram of the snap ring structure in this utility model;

[0028] Figure 8 This is a schematic diagram of the positioning screw structure in this utility model;

[0029] Figure 9 This is a schematic diagram of the screw structure in this utility model;

[0030] Figure 10 This is a schematic diagram of the O-ring structure in this utility model;

[0031] Figure 11 This is a schematic diagram of the gasket structure in this utility model;

[0032] Figure 12 This is a schematic diagram of the transmission pin structure in this utility model.

[0033] Explanation of reference numerals in the attached drawings: 1. Shaft; 2. Transmission seat; 3. First O-ring; 4. Moving ring; 5. Transmission pin; 6. Second O-ring; 7. Locating screw; 8. Stationary ring; 9. Small spring; 10. Third O-ring; 11. Snap ring; 12. Flange cover; 13. Gasket; 14. Screw; 15. Bearing housing; 16. Moving ring groove; 17. First mounting groove; 18. Second mounting groove. Detailed Implementation

[0034] like Figure 1-12 As shown, a dry gas mechanical seal device for a bearing housing includes a dynamic ring seal assembly and a stationary ring seal assembly. The dynamic ring seal assembly is mounted on a shaft 1 and rotates synchronously with the shaft 1. The stationary ring seal assembly is mounted on the outside of the bearing housing 15. The end face of the dynamic ring seal assembly and the end face of the stationary ring seal assembly form a friction pair.

[0035] The dynamic ring sealing assembly includes a transmission seat 2, which is disposed on the shaft 1, and a dynamic ring 4 is disposed on the side of the transmission seat 2 near the bearing housing 15;

[0036] The stationary ring sealing assembly includes a flange cover 12, which is disposed on the outside of the bearing housing 15. A stationary ring 8 is disposed on the side of the flange cover 12 near the transmission seat 2, and a small spring 9 is disposed between the stationary ring 8 and the flange cover 12.

[0037] The end face of the moving ring 4 and the end face of the stationary ring 8 form a friction pair.

[0038] The transmission seat 2 is inlaid with a transmission pin 5, such as Figure 2 As shown, the moving ring 4 has a first mounting groove 17 that matches the transmission pin 5 on the side near the transmission seat 2.

[0039] like Figure 3 As shown, the end face of the moving ring 4 near the stationary ring 8 is laser-etched with several moving ring grooves 16, which are evenly distributed circumferentially. The cross-section of the moving ring grooves 16 is T-shaped.

[0040] like Figure 4 As shown, a second mounting groove 18 matching the small spring 9 is provided on the side of the stationary ring 8 near the flange cover 12.

[0041] The transmission seat 2 is connected to the shaft 1 by a positioning screw 7.

[0042] A second O-ring 6 is installed between the transmission seat 2 and the shaft 1.

[0043] A first O-ring 3 is installed between the moving ring 4 and the transmission seat 2.

[0044] A third O-ring 10 is installed between the stationary ring 8 and the flange cover 12.

[0045] The flange cover 12 is connected to the bearing housing 15 by screws 14. A gasket 13 is installed between the flange cover 12 and the bearing housing 15. A retaining ring 11 for limiting the stationary ring 8 is provided on the side of the flange cover 12 away from the bearing housing 15.

[0046] The installation process of this utility model is as follows:

[0047] A moving ring groove 16 is laser-engraved on the end face of the moving ring 4. The transmission pin 5 is embedded in the transmission seat 2. The second O-ring 6, the first O-ring 3, and the moving ring 4 are placed in the transmission seat 2. The small spring 9 and the third O-ring 10 are placed in the stationary ring 8. The small spring 9, the third O-ring 10, and the stationary ring 8 are then placed together in the flange cover 12. The snap ring 11 is then placed in the flange cover 12 for integration. The gasket 13 is then placed in the flange cover 12. The screw 14 is then placed in the flange cover 12. The flange cover 12 is then fixed to the bearing housing 15. The transmission seat 2 is then placed on the shaft 1. The positioning screw 7 is placed in the transmission seat 2 and fixed to the shaft 1 to form an integrated sealing device.

[0048] Compared with previous labyrinth comb-type and magnetic oil seal structures, this utility model has the advantages of extending service life and reducing maintenance costs in the bearing housing. When the equipment is not in operation, the small spring 9 set in the stationary ring 8 provides the closing force between the moving ring 2 and the stationary ring 8. Simultaneously, the first O-ring 3, the second O-ring 6, and the third O-ring 10 respectively seal the moving seat 2 and the moving ring 4, the shaft 1 and the transmission seat 2, and the stationary ring 8 and the flange cover 12. The retaining ring 11 integrates the stationary ring 8, the third O-ring 10, and the small spring 9 into the flange cover 12. Gasket 1... 3. The leakage point between the sealing flange cover 12 and the bearing housing 15 cavity is sealed to facilitate the lubrication of the cavity. The screw 14 connects the flange cover 12 to the bearing housing 15. The positioning screw 7 is placed on the transmission seat 2 to connect the shaft 1. When the equipment is running, since the moving ring 4 and the stationary ring 8 are connected to the atmosphere, an air film is formed between the moving ring 4 and the stationary ring 8 through the T-shaped moving ring groove 16 set on the moving ring 4, which pushes the moving and stationary rings apart to ensure that the end faces are in a non-contact state, thereby ensuring the service life of the mechanical seal and reducing the user's maintenance costs.

[0049] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A dry gas mechanical seal device for bearing housings, characterized in that: It includes a dynamic ring seal assembly and a static ring seal assembly. The dynamic ring seal assembly is mounted on the shaft (1) and rotates synchronously with the shaft (1). The static ring seal assembly is mounted on the outside of the bearing housing (15). The end face of the dynamic ring seal assembly and the end face of the static ring seal assembly are a pair of friction pairs. The dynamic ring sealing assembly includes a transmission seat (2), which is disposed on the shaft (1). A dynamic ring (4) is disposed on the side of the transmission seat (2) near the bearing housing (15). The stationary ring sealing assembly includes a flange cover (12), which is located outside the bearing housing (15). A stationary ring (8) is provided on the side of the flange cover (12) near the transmission seat (2), and a small spring (9) is provided between the stationary ring (8) and the flange cover (12). The end face of the moving ring (4) and the end face of the stationary ring (8) form a friction pair.

2. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: The transmission seat (2) is provided with a transmission pin (5), and the moving ring (4) is provided with a first mounting groove (17) that matches the transmission pin (5) on the side near the transmission seat (2).

3. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: The moving ring (4) has a plurality of moving ring grooves (16) on one side near the stationary ring (8), and the plurality of moving ring grooves (16) are evenly distributed in a circle.

4. The dry gas mechanical seal device for bearing housing according to claim 3, characterized in that: The cross-section of the moving ring groove (16) is T-shaped.

5. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: The stationary ring (8) is provided with a second mounting groove (18) that matches the small spring (9) on the side near the flange cover (12).

6. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: The transmission seat (2) is connected to the shaft (1) by a positioning screw (7).

7. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: A second O-ring (6) is provided between the transmission seat (2) and the shaft (1).

8. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: A first O-ring (3) is provided between the moving ring (4) and the transmission seat (2).

9. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: A third O-ring (10) is provided between the stationary ring (8) and the flange cover (12).

10. The dry gas mechanical seal device for bearing housing according to claim 1, characterized in that: The flange cover (12) is connected to the bearing housing (15) by screws (14). A gasket (13) is provided between the flange cover (12) and the bearing housing (15). A retaining ring (11) for limiting the stationary ring (8) is provided on the side of the flange cover (12) away from the bearing housing (15).

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