Mechanical sealing device for corrosion-resistant working condition

Abstract

The utility model discloses a mechanical sealing device for corrosion-resistant working conditions, which is mounted in a gap between a pump shaft and a pump cavity and comprises a gland, a static ring, a moving ring component, a shaft sleeve and a driving ring, the shaft sleeve is annularly sleeved on a shaft rod of the pump shaft, and the gland is annularly sleeved on the periphery of the shaft sleeve and fixedly connected with an external pump body. The static ring is located on the front side of the shaft sleeve and annularly sleeved on the shaft rod, the movable ring assembly is located between the gland and the shaft rod and annularly sleeved on the shaft rod, the movable ring assembly is located on the rear side of the static ring and forms movable seal with the static ring, a lining annularly sleeved on the shaft rod is arranged between the tail portion of the shaft sleeve and the shaft rod, and the driving ring annularly sleeves the tail portion of the shaft sleeve at the position corresponding to the lining. A plurality of corresponding threaded holes are formed in the driving ring and the shaft sleeve in the radial direction, and the driving ring and the shaft sleeve are connected through screws and tightly hold the lining. The mechanical sealing device for the corrosion-resistant working condition is good in sealing effect, does not affect overall use and installation of the pump body, and is long in service life.

Description

Technical Field

[0001] The utility model relates to a mechanical seal device for corrosion-resistant working conditions, belonging to the technical field of mechanical seals. Background Art

[0002] A corrosion-resistant pump is a special industrial pump used to transport corrosive media. Since the pump shaft passes through the pump cavity to drive the impeller to do work, there is a circumferential gap between the shaft and the cavity at this time. The transported medium leaks from this gap to the atmosphere side, which not only corrodes and endangers the pump body, but also causes environmental pollution. Therefore, a mechanical seal device is needed to prevent the medium from leaking.

[0003] Corrosion-resistant pumps are usually made of corrosion-resistant materials, and the materials in contact with the medium are such as plastics, ceramics, rubbers, polytetrafluoroethylene, etc. In the prior art, polytetrafluoroethylene is used as the sealing surface material and structural part material for mechanical seals in corrosion-resistant working conditions. Once the medium temperature increases, due to the high expansion coefficient of polytetrafluoroethylene, the sealing surface deforms, causing the medium to leak. In addition, high temperature will also weaken the material strength, resulting in easy damage to parts and unstable and unreliable transmission of parts. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a mechanical seal device for corrosion-resistant working conditions that can effectively improve the sealing effect.

[0005] To solve the above technical problem, the utility model is realized through the following technical solutions:

[0006] A mechanical seal device for corrosion-resistant working conditions is installed in the gap between the pump shaft and the pump cavity, and includes a gland, a stationary ring, a rotating ring assembly, a shaft sleeve, and a driving ring. The shaft sleeve is sleeved on the shaft rod of the pump shaft, the gland is sleeved on the outer periphery of the shaft sleeve and is fixedly connected to the external pump body. The stationary ring is located on the front side of the shaft sleeve and is sleeved on the shaft rod. The stationary ring is located between the gland and the shaft rod and forms a static seal with the gland. The rotating ring assembly is located between the gland and the shaft rod and is sleeved on the shaft rod. The rotating ring assembly is located on the rear side of the stationary ring and forms a dynamic seal with the stationary ring. A bushing sleeved on the shaft rod is provided between the tail of the shaft sleeve and the shaft rod. The driving ring is sleeved on the tail of the shaft sleeve at a position corresponding to the bushing. A plurality of corresponding threaded holes are provided in the driving ring and the shaft sleeve along the radial direction, and the driving ring and the shaft sleeve are connected by screws and clamp the bushing.

[0007] Preferably, a plurality of first sealing rings are provided between the outer periphery of the stationary ring and the gland.

[0008] Preferably, the rotating ring assembly includes a rotating ring and a spring assembly. The rotating ring is sleeved on the shaft rod and its front end contacts the stationary ring. One end of the spring assembly abuts against the shaft sleeve, and the other end is fixed on the rotating ring, so as to form an elastic dynamic seal between the rotating ring and the stationary ring.

[0009] Preferably, a plurality of spring assemblies are provided, each including a spring and a spring seat. The spring seats are circumferentially arrayed and fixed to the rear edge of the moving ring. A plurality of counterbores are provided at the relative positions of the sleeve and the spring seats. One end of the spring is connected to the spring seat, and the other end extends into the counterbore and abuts against the bottom of the hole.

[0010] Preferably, a second sealing ring is provided between the moving ring and the sleeve.

[0011] Preferably, a snap ring is provided on the outer side of the driving ring, which is clamped to the tail of the sleeve and axially limits it.

[0012] Preferably, a mounting piece is sleeved on the outer side of the driving ring. The front side of the mounting piece is clamped to the tail of the gland. A plurality of radial threaded holes are provided between the mounting piece and the driving ring. The mounting piece and the driving ring are connected together by fastening screws, and then the driving ring, the sleeve and the gland are connected as a whole.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The mechanical seal device for corrosion-resistant working conditions has good sealing effect, does not affect the overall use and installation of the pump body, has a long service life, reduces later maintenance, saves costs, and has high practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts;

[0015] Figure 1 It is a partial side sectional view of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model:

[0017] Such as Figure 1A mechanical seal device for corrosion-resistant working conditions, installed in the gap between the pump shaft and the pump chamber, includes a gland 1, a stationary ring 2, a rotating ring assembly, a shaft sleeve 3, and a driving ring 4. The shaft sleeve is sleeved on the shaft rod 5 of the pump shaft. The gland is sleeved on the outer periphery of the shaft sleeve and is fixedly connected to the external pump body 6. The stationary ring is located on the front side of the shaft sleeve and is sleeved on the shaft rod. The stationary ring is located between the gland and the shaft rod and forms a static seal with the gland. An L-shaped groove is provided on the outer periphery of the stationary ring. A sealing cavity is formed between the L-shaped groove, the outer wall of the pump body, and the inner wall of the front side of the gland. A first sealing ring 7 is provided in the sealing cavity. In addition, to improve the static seal effect, two first sealing rings are also provided between the rear side wall of the stationary ring and the inner wall of the gland, thereby effectively improving the sealing effect between the stationary ring and the gland.

[0018] The rotating ring assembly is located between the gland and the shaft rod and is sleeved on the shaft rod. The rotating ring assembly is located behind the stationary ring and forms a dynamic seal with the stationary ring. In this embodiment, to improve the dynamic seal effect, the rotating ring assembly includes a rotating ring 8 and a spring assembly. The rotating ring is sleeved on the shaft rod and its front end contacts the stationary ring. One end of the spring assembly abuts against the shaft sleeve, and the other end is fixed on the rotating ring, so that an elastic dynamic seal is formed between the rotating ring and the stationary ring. Further, the spring assembly is provided with a plurality of springs 9 and spring seats 10. The spring seats are circumferentially arrayed and fixed on the rear side edge of the rotating ring. A plurality of counterbores are provided at the relative positions of the shaft sleeve and the spring seats. One end of the spring is connected to the spring seat, and the other end extends into the counterbore and abuts against the bottom of the hole. Therefore, the rotating ring is elastically tightened by the spring, and then the rotating ring is elastically contacted with the stationary ring, thereby improving the static seal effect between the rotating ring and the stationary ring. By designing the counterbore, the structural stability of the overall dynamic seal can be effectively improved.

[0019] A bushing 11 sleeved on the shaft rod is provided between the tail of the shaft sleeve and the shaft rod. The driving ring is sleeved on the tail of the shaft sleeve at a position corresponding to the bushing. A plurality of corresponding threaded holes are provided on the driving ring and the shaft sleeve in the radial direction. The driving ring and the shaft sleeve are connected by screws 12 and the bushing is clamped. Then, by tightening the screws, the bushing can be shrunk to clamp the shaft sleeve, thereby playing a role in transmitting torque, effectively avoiding the problem of the shaft sleeve being broken due to the screws being directly fastened to the shaft sleeve, and improving the structural stability and service life. In addition, to improve the stability of the driving ring, a snap ring 16 is provided on the outer side of the driving ring to clamp the tail of the shaft sleeve and axially limit it.

[0020] To improve the sealing effect, in this embodiment, a second sealing ring 13 is provided between the rotating ring and the shaft sleeve.

[0021] In addition, in this embodiment, to improve the overall structural stability, a mounting piece 14 sleeved on the outside of the driving ring is provided outside the driving ring. The front side of the mounting piece is clamped with the tail of the gland. A plurality of radial threaded holes are provided between the mounting piece and the driving ring. The mounting piece and the driving ring are connected together by fastening screws 15, and then the driving ring, the shaft sleeve, and the gland are connected as a whole. Therefore, not only the structural stability is effectively improved, but also the installation and disassembly are convenient.

[0022] In practical applications, the materials of the moving ring and the static ring are made of silicon carbide. The silicon carbide material has the advantages of good corrosion resistance, low expansion coefficient, high temperature resistance, etc., and effectively solves the problem of seal surface deformation caused by temperature change. Therefore, by pressing the static ring and the moving ring assembly with the gland, and connecting and forming an integral structure with the shaft sleeve driving ring, the installation and disassembly are convenient, and the overall structural stability is improved. Sealing rings are provided between the static ring and the gland, and between the moving ring and the shaft rod of the pump shaft. Therefore, the sealing effect is effectively improved, and the dynamic seal formed by the elastic contact between the moving ring and the static ring through the spring assembly effectively improves the stability and sealing effect of the dynamic seal. Therefore, when applied to a corrosion-resistant pump, not only the sealing is effectively realized, but also the sealing effect is better, the problem of seal surface deformation is avoided, the structural parts are not easily damaged, the stability and reliability are higher, and the service life is longer.

[0023] It should be emphasized that the above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A mechanical seal device for corrosion-resistant working conditions, installed in the gap between the pump shaft and the pump chamber, characterized in that: It includes a gland, a stationary ring, a rotating ring assembly, a shaft sleeve, and a drive ring. The shaft sleeve is sleeved on the shaft rod of the pump shaft. The gland is sleeved on the outer periphery of the shaft sleeve and is fixedly connected to the external pump body. The stationary ring is located on the front side of the shaft sleeve and is sleeved on the shaft rod. The stationary ring is located between the gland and the shaft rod and forms a static seal with the gland. The rotating ring assembly is located between the gland and the shaft rod and is sleeved on the shaft rod. The rotating ring assembly is located behind the stationary ring and forms a dynamic seal with the stationary ring. A bushing sleeved on the shaft rod is provided between the tail of the shaft sleeve and the shaft rod. The drive ring is sleeved on the tail of the shaft sleeve at a position corresponding to the bushing. A plurality of corresponding threaded holes are provided radially on the drive ring and the shaft sleeve. The drive ring and the shaft sleeve are connected by screws and the bushing is clamped tightly.

2. The mechanical seal device for corrosion-resistant working conditions according to claim 1, characterized in that: A plurality of first sealing rings are provided between the outer periphery of the stationary ring and the gland.

3. A mechanical seal device for corrosion-resistant working conditions according to claim 1, characterized in that: The rotating ring assembly includes a rotating ring and a spring assembly. The rotating ring is sleeved on the shaft rod and its front end contacts the stationary ring. One end of the spring assembly abuts against the shaft sleeve and the other end is fixed on the rotating ring, so as to form an elastic dynamic seal between the rotating ring and the stationary ring.

4. A mechanical seal device for corrosion-resistant working conditions according to claim 3, characterized in that: The spring assembly is provided with a plurality of sets, and each set includes a spring and a spring seat. The spring seats are circumferentially arrayed and fixed on the rear edge of the rotating ring. A plurality of counterbores are provided at the relative positions of the shaft sleeve and the spring seats. One end of the spring is connected to the spring seat, and the other end extends into the counterbore and abuts against the bottom of the hole.

5. The mechanical seal device for corrosion-resistant working conditions according to claim 3, characterized in that: A second sealing ring is provided between the rotating ring and the shaft sleeve.

6. The mechanical seal device for corrosion-resistant working conditions according to claim 1, wherein: A snap ring that is clamped on the tail of the shaft sleeve and axially positions it is provided on the outer side of the drive ring.

7. The mechanical seal device for corrosion-resistant working conditions according to claim 1, characterized in that: An installation piece sleeved on its outer side is provided on the outer side of the drive ring. The front side of the installation piece is clamped with the tail of the gland. A plurality of radial threaded holes are provided between the installation piece and the drive ring. The installation piece and the drive ring are connected together by fastening screws, and then the drive ring, the shaft sleeve, and the gland are connected as a whole.

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