CN216951667U

CN216951667U - Mechanical sealing device

Info

Publication number: CN216951667U
Application number: CN202121493320.7U
Authority: CN
Inventors: 丁昂
Original assignee: AESSEAL CHINA Ltd
Current assignee: AESSEAL CHINA Ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2022-07-12
Anticipated expiration: 2031-07-01

Abstract

The utility model discloses a mechanical sealing device, which comprises a shaft, a propulsion type sealing assembly and a flow guide unit, wherein the shaft is provided with a thrust bearing; the pusher seal assembly includes a seal sleeve; the flow guide unit comprises a flow guide sleeve and a flow guide ring, the flow guide ring is sleeved at one end of the sealing shaft sleeve, and a flow guide cavity is formed between the flow guide ring and the flow guide sleeve; the guide ring is used for driving fluid in the guide cavity to flow out quickly, and the guide sleeve is provided with a bulge part for preventing the fluid from flowing back to enter the guide cavity; the flow guide sleeve is matched with the flow guide ring, so that the flow velocity of a flushing medium is improved, and heat generated by the mechanical seal end face is quickly taken away; the cooling baffle plate is arranged to prevent bubbles generated during internal flushing from influencing the mechanical sealing operation; the flow guide ring is made of Alloy C-276, so that the high-temperature resistance and corrosion resistance are enhanced, and the service life is prolonged.

Description

Mechanical sealing device

Technical Field

The utility model relates to the technical field of mechanical sealing, in particular to a mechanical sealing device.

Background

The mechanical seal is a shaft seal device which is kept attached by one or a plurality of pairs of end faces which slide relatively and are vertical to a shaft under the action of fluid pressure and elasticity (or magnetic force) of a compensation mechanism and is matched with auxiliary seal to achieve leakage resistance, and the mechanical seal is widely applied to equipment such as a centrifugal pump, a centrifugal machine, a reaction kettle, a compressor and the like; the integrated mechanical sealing device on the market at present can not achieve the purpose of quickly taking away heat under the high-temperature working condition, is difficult to adapt to the high-temperature working condition, and has certain use limitation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mechanical sealing device to solve the technical problem that rapid heat dissipation is difficult in the prior art.

In order to solve the technical problem, the mechanical sealing device provided by the utility model comprises a shaft, a propulsion type sealing assembly and a flow guide unit; the pusher seal assembly includes a seal sleeve; the flow guide unit comprises a flow guide sleeve and a flow guide ring, the flow guide ring is sleeved at one end of the sealing shaft sleeve, and a flow guide cavity is formed between the flow guide ring and the flow guide sleeve; the flow guide ring is used for driving fluid in the flow guide cavity to flow out quickly, and the flow guide sleeve is provided with a protruding part for preventing the fluid from flowing back to enter the flow guide cavity.

Preferably, the push type sealing assembly comprises a movable ring, a fixed ring, a spring seat unit, a throttling lining unit and a gland; a cooling cavity is formed in the push type sealing assembly, a flushing fluid inlet and a flushing fluid outlet which are communicated with the cooling cavity are formed in the gland, and a cooling baffle is further arranged on the gland; the pressure cover is also provided with a flushing flow passage communicated with the flow guide cavity.

Preferably, a driving ring is fixedly connected to the outer peripheral surface of the sealing shaft sleeve, a positioning block is fixedly connected to the driving ring, and the positioning block is rotatably connected with the gland through a groove to limit the displacement of the gland.

Preferably, the guide ring is a bidirectional conical blade suction ring, and the conical surface of the guide ring and the convex part form a fixed angle.

Preferably, the deflector ring is Alloy C-276.

Preferably, a sealing ring is arranged between the movable ring and the sealing shaft sleeve.

Preferably, a seal ring is arranged between the seal shaft sleeve and the shaft.

Preferably, a sealing ring is arranged between the static ring and the spring seat unit.

Preferably, a sealing ring is respectively arranged between the gland and the spring seat unit and between the gland and the throttling bush unit.

After adopting the structure, compared with the prior art, the utility model has the following advantages: the flow guide sleeve is matched with the flow guide ring, so that the flow velocity of a flushing medium is improved, and heat generated by the mechanical seal end face is quickly taken away; the cooling baffle plate is arranged to prevent bubbles generated during internal flushing from influencing the mechanical sealing operation; the flow guide ring is made of Alloy C-276, so that the high-temperature resistance and corrosion resistance are enhanced, and the service life is prolonged.

Drawings

FIG. 1 is a cross-sectional view of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the mechanical sealing device of the present invention includes a shaft 1, a pusher seal assembly 2, and a deflector unit 3; the pusher seal assembly 2 comprises a seal bushing 21; the guide unit 3 comprises a guide sleeve 31 and a guide ring 32, the guide ring 32 is sleeved at one end of the sealing shaft sleeve 21, and a guide cavity 33 is formed between the guide ring 32 and the guide sleeve 31; the diversion ring 32 is used for driving the fluid in the diversion cavity 33 to flow out quickly, and the diversion sleeve 31 is provided with a convex part 311 for preventing the fluid from flowing back to enter the diversion cavity 33; when the sealing device works specifically, the guide ring 32 rotates along with the sealing shaft sleeve 21 to generate driving force, so that the fluid in the guide cavity 33 flows out from one side of the convex part 311 quickly, and the heat of the sealing end face is taken away quickly; the left side of the boss 311 is typically the working medium of the pump, and the boss 311 is configured to prevent the working medium from flowing backward into the diversion chamber 33.

The push type sealing assembly 2 comprises a movable ring 22, a fixed ring 23, a spring seat unit 24, a throttling lining unit 25 and a gland 26; a cooling cavity 27 is formed in the push type sealing assembly 2, a flushing liquid inlet and a flushing liquid outlet which are communicated with the cooling cavity 27 are formed in the gland 26, and a cooling baffle 263 is further arranged on the gland 26; the gland 26 is also provided with a flushing flow passage 28 communicated with the diversion cavity 33; during specific work, the flush fluid from the flush fluid import enter into cooling chamber 27 in carry on inside wash after flow out from the flush fluid export, cooling baffle 263 is annular baffle, arranges in between flush fluid import and the flush fluid export for the flush fluid velocity of flow slows down, prevents that the flush fluid from producing the work that the bubble influences mechanical seal device.

The outer peripheral surface of the sealing shaft sleeve 21 is fixedly connected with a driving ring 11, the driving ring 11 is fixedly connected with a positioning block 12, and the positioning block 12 is rotatably connected with a gland 26 through a groove 121 to limit the displacement of the gland 26.

The guide ring 32 is a bidirectional conical blade suction ring, the conical surface of the guide ring 32 and the convex part 311 are parallel to the opposite surface, and the distance between the conical surface and the convex part is small, so that the suction effect of the guide ring 32 is enhanced.

The deflector ring 32 is Alloy C-276; during specific work, the guide ring 32 not only needs to rotate at a high speed to generate heat, but also needs to resist corrosion of a working medium, so that Alloy C-276 Alloy is adopted, high-temperature resistance and corrosion resistance are enhanced, and the service life is prolonged.

A sealing ring is arranged between the movable ring 22 and the sealing shaft sleeve 21.

And a sealing ring is arranged between the sealing shaft sleeve 21 and the shaft 1.

And a sealing ring is arranged between the static ring 23 and the spring seat unit 24.

And sealing rings are respectively arranged among the gland 26, the spring seat unit 24 and the throttling bush unit 25.

The above description is only about the preferred embodiment of the present invention, but it should not be understood as limiting the claims, and the present invention may be modified in other structures, not limited to the above structures. In general, all changes which come within the scope of the utility model as defined by the independent claims are intended to be embraced therein.

Claims

1. A mechanical sealing device is characterized by comprising a shaft (1), a propulsion sealing assembly (2) and a flow guide unit (3); the push type sealing assembly (2) comprises a sealing shaft sleeve (21); the flow guide unit (3) comprises a flow guide sleeve (31) and a flow guide ring (32), the flow guide ring (32) is sleeved at one end of the sealing shaft sleeve (21), and a flow guide cavity (33) is formed between the flow guide ring (32) and the flow guide sleeve (31); the flow guide ring (32) is used for driving fluid in the flow guide cavity (33) to flow out quickly, and a protruding portion (311) for preventing the fluid from flowing back to enter the flow guide cavity (33) is arranged on the flow guide sleeve (31).

2. The mechanical sealing device according to claim 1, characterized in that the pusher seal assembly (2) comprises a moving ring (22), a stationary ring (23), a spring seat unit (24), a throttling bush unit (25) and a gland (26); a cooling cavity (27) is formed in the push type sealing assembly (2), a flushing liquid inlet and a flushing liquid outlet which are communicated with the cooling cavity (27) are formed in the gland (26), and a cooling baffle (263) is further arranged on the gland (26); the gland (26) is also provided with a flushing flow passage (28) communicated with the diversion cavity (33).

3. The mechanical sealing device according to claim 1, wherein the sealing sleeve (21) is fixedly connected with a driving ring (11) on the outer peripheral surface, a positioning block (12) is fixedly connected with the driving ring (11), and the positioning block (12) is rotatably connected with the gland (26) through a groove (121) to limit the displacement of the gland (26).

4. A mechanical seal according to claim 1 wherein the deflector ring (32) is a bi-directional conical vane suction ring, the conical surface of the deflector ring (32) being at a fixed angle to the nose (311).

5. The mechanical seal of claim 1, wherein the deflector ring (32) is Alloy C-276.

6. A mechanical seal according to claim 2 wherein a seal is provided between the rotating ring (22) and the seal housing (21).

7. A mechanical seal according to claim 1 wherein a seal is provided between the seal housing (21) and the shaft (1).

8. A mechanical sealing device according to claim 2, wherein a sealing ring is arranged between the stationary ring (23) and the spring seat unit (24).

9. A mechanical sealing arrangement according to claim 2, characterized in that sealing rings are provided between the gland (26) and the spring retainer unit (24) and the throttle bushing unit (25), respectively.