CN220622750U

CN220622750U - High-temperature-resistant and high-pressure-resistant mechanical seal

Info

Publication number: CN220622750U
Application number: CN202322379208.6U
Authority: CN
Inventors: 俞旭腾; 张竺翔; 仇栋
Original assignee: Ningbo Anmu Sealing Technology Co ltd
Current assignee: Ningbo Anmu Sealing Technology Co ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2024-03-19
Anticipated expiration: 2033-09-01

Abstract

The utility model provides a high temperature and high pressure resistant mechanical seal, which belongs to the technical field of mechanical seals and comprises the following components: the movable assembly comprises a shaft sleeve, a metal corrugated pipe and a movable ring, wherein the shaft sleeve is sleeved with the metal corrugated pipe and the movable ring, one end of the metal corrugated pipe is fixedly connected with the shaft sleeve, and the other end of the metal corrugated pipe is connected with the movable ring; the static assembly comprises a gland and a static ring, the gland is provided with a mounting hole, and the static ring is positioned in the mounting hole and connected with the gland; in the use state, the movable ring is contacted with the static ring surface, a sealing surface is formed between the movable ring and the static ring surface, and the metal corrugated pipe is in a compression state and provides positive pressure for the movable ring to be attached to the static ring; the beneficial effects of the utility model are as follows: the mechanical seal moving assembly adopts the metal corrugated pipe as the pressure element, has the advantages of high temperature resistance and high pressure resistance, is not easy to wear and lose efficacy, and has good sealing performance and long service cycle.

Description

High-temperature-resistant and high-pressure-resistant mechanical seal

Technical Field

The utility model belongs to the technical field of mechanical sealing, and relates to a high-temperature-resistant and high-pressure-resistant mechanical seal.

Background

Mechanical seals are widely used in pumps, compressors, and stirring machines. The function of the device is to isolate the leakage path between the rotating component (such as the shaft) and the static structural cavity and prevent the harmful medium in the cavity from leaking to the outside. The mechanical seal is typically comprised of a moving assembly secured to the shaft and a stationary assembly secured to the chamber.

The spring mechanical seal is a common mechanical seal structure, and the moving assembly of the spring mechanical seal consists of a movable ring, a sealing ring, a pressure element (spring) and a metal structural member; the static assembly is relatively simple, and is composed of a grooved static ring and a rubber sealing element sleeved in the groove, wherein the dynamic ring and the static ring are a pair of friction pairs with high flatness, a sealing surface is formed under the action of a pressure element, and a gap between the dynamic ring and the static ring in relative rotation is in a micron order, so that internal fluid can be effectively prevented from leaking from the sealing surface. The spring of the moving assembly is compressed when installed, thereby providing a positive pressure on the sealing surface. This positive pressure must counteract the thrust caused by the fluid pressure inside the seal to keep the sealing surfaces closed. If the design working pressure of the seal is high, the positive pressure of the elastic element at the working height is high, so that high friction torque is brought to the dynamic and static ring, the ring surface is lost, and the pressure element is needed to compensate the loss of the ring surface.

At present, some mechanical seals are in a high-temperature high-pressure working environment for a long time, and part of pressure elements are easy to wear and lose efficacy, so that the seals leak, and the whole mechanical seal fails.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides a high-temperature-resistant and high-pressure-resistant mechanical seal.

The aim of the utility model can be achieved by the following technical scheme: a high temperature and pressure resistant mechanical seal comprising:

the movable assembly comprises a shaft sleeve, a metal corrugated pipe and a movable ring, wherein the metal corrugated pipe and the movable ring are sleeved on the shaft sleeve, one end of the metal corrugated pipe is fixedly connected with the shaft sleeve, and the other end of the metal corrugated pipe is connected with the movable ring;

the static assembly comprises a gland and a static ring, wherein the gland is provided with a stepped hole, and the static ring is positioned in the stepped hole and connected with the gland;

in a use state, the movable ring is in surface contact with the static ring, a sealing surface is formed between the movable ring and the static ring, and the metal corrugated pipe is in a compressed state and provides positive pressure for the movable ring to be attached to the static ring.

Preferably, the shaft sleeve is sleeved with a stop ring, and the stop ring is provided with a first set screw penetrating through the shaft sleeve and used for being connected with the rotating shaft so that the shaft sleeve and the rotating shaft rotate together.

Preferably, the shaft sleeve passes through the stationary ring, the stop ring and the metal bellows are respectively positioned at two ends of the shaft sleeve and distributed at two sides of the gland along the axial direction of the shaft sleeve, and the stop ring is in abutting connection with the gland.

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

Preferably, the gland is provided with a through hole, two ends of the through hole are respectively positioned on two side surfaces of the gland, and one end of the through hole faces to the position where the sealing surface is positioned.

Preferably, a gasket is arranged on one surface of the gland corresponding to the medium side.

Preferably, a first O-shaped sealing ring is arranged on the inner peripheral surface of the shaft sleeve, a second O-shaped sealing ring is arranged between the metal corrugated pipe and the shaft sleeve, and a third O-shaped sealing ring is arranged between the stationary ring and the gland.

Preferably, the stationary ring and the gland are circumferentially fixed through an anti-rotation pin.

Preferably, the movable ring is a graphite piece.

Preferably, one end of the metal corrugated pipe is fixedly connected with the shaft sleeve through a second set screw.

Compared with the prior art, the utility model has the beneficial effects that:

1. the mechanical seal moving assembly adopts the metal corrugated pipe as the pressure element, has the advantages of high temperature resistance and high pressure resistance, is not easy to wear and lose efficacy, and has good sealing performance and long service cycle.

2. The sealing performance of the metal corrugated pipe is more stable, the metal corrugated pipe is not easy to wear and lose efficacy, and the service life is long.

3. The movable ring is a graphite piece, and the graphite material has better heat resistance, improves high-temperature resistance and ensures that the movable ring is not easy to be worn.

Drawings

Fig. 1 is a schematic structural view of the mechanical seal of the present utility model.

Fig. 2 is a side view of the mechanical seal of the present utility model.

100, a shaft sleeve; 110. a stop ring; 120. a backing ring; 130. a first set screw; 140. a first O-ring seal; 150. a second O-ring seal; 200. a metal bellows; 210. a second set screw; 300. a moving ring; 400. a gland; 410. a stepped hole; 420. a through hole; 430. a gasket; 440. a third O-ring seal; 500. and (5) a stationary ring.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1-2, a high temperature and pressure resistant mechanical seal comprising: the movable assembly comprises a shaft sleeve 100, a metal corrugated pipe 200 and a movable ring 300, wherein the metal corrugated pipe 200 and the movable ring 300 are sleeved on the shaft sleeve 100, one end of the metal corrugated pipe 200 is fixedly connected with the shaft sleeve 100, and the other end of the metal corrugated pipe 200 is connected with the movable ring 300; the stationary assembly comprises a gland 400 and a stationary ring 500, the gland 400 having a stepped bore 410, the stationary ring 500 being located within the stepped bore 410 and connected to the gland 400; in the use state, the movable ring 300 is in surface contact with the static ring 500 and forms a sealing surface therebetween, and the metal bellows 200 is in a compressed state and provides positive pressure to the movable ring 300, which is attached to the static ring 500.

The working principle of the mechanical seal is as follows: the shaft sleeve 100 is sleeved on the rotating shaft and is fixed together, the metal corrugated pipe 200 and the shaft sleeve 100 are fixed together and can rotate together with the rotating shaft, the metal corrugated pipe 200 has certain elasticity in a compressed state, namely the metal corrugated pipe 200 has an extending movement trend, and the metal corrugated pipe 200 props against the movable ring 300 and applies positive pressure to the movable ring; the gland 400 is connected with the outer wall of the equipment or the cavity, the static ring 500 is kept static relative to the rotating shaft, the moving ring 300 is tightly attached to the static ring 500 under the action of positive pressure so as to enable the sealing surface to be closed, and when the annular surface is worn, the moving ring 300 is pushed by the metal corrugated pipe 200 to compensate the abrasion of the annular surface.

It should be noted that the stepped hole 410 has a stepped shaft hole structure, and the stationary ring 500 is clamped in the stepped hole 410 to achieve axial fixation.

The metal corrugated pipe 200 can play a role in dust sealing, the sealing performance of the metal corrugated pipe 200 is more stable, the metal corrugated pipe is not easy to wear and lose efficacy, and the service cycle is long; specifically, the metal bellows 200 has two ends, between which is a corrugated tubular folded structure, and since one end of the metal bellows 200 is fixed to the sleeve 100, the tubular folded structure of the metal bellows 200 can apply a positive pressure to the ring 300 through the other end thereof in a compressed power storage state.

The mechanical seal moving assembly adopts the metal bellows 200 as a pressure element, has the advantages of high temperature resistance and high pressure resistance, is not easy to wear and lose efficacy, and has good sealing performance and long service cycle.

As shown in fig. 1, the sleeve 100 is provided with a stop ring 110, and the stop ring 110 is provided with a first fastening screw 130 penetrating the sleeve 100 and used for being connected with a rotating shaft so as to enable the sleeve 100 to rotate together with the rotating shaft.

The shaft sleeve 100 is fixedly connected with the rotating shaft through the stop ring 110, specifically, the first set screw 130 passes through the stop ring 110 and is fixedly connected with the shaft sleeve 100 and the rotating shaft, so that the shaft sleeve 100 rotates together with the rotating shaft.

On the basis of the above embodiment, the shaft sleeve 100 passes through the stationary ring 500, the stop ring 110 and the metal bellows 200 are respectively located at two ends of the shaft sleeve 100 and distributed on two sides of the gland 400 along the axial direction of the shaft sleeve 100, and the stop ring 110 is in abutting connection with the gland 400.

Specifically, the stopper ring 110 and the metal bellows 200 are located at both sides of the gland 400, and since there are many components to be mounted on the sleeve 100, it is necessary to pass the sleeve 100 through the stationary ring 500 (gland 400) so that the sleeve 100 has a sufficient axial length to mount the stopper ring 110.

In addition to the above embodiment, a backing ring 120 is disposed between the sleeve 100 and the stop ring 110. Since the shaft rotates the sleeve 100 and the stop ring 110 together, and the gland 400 is kept stationary, the backing ring 120 is disposed between the sleeve 100 and the gland 400 to avoid direct contact therebetween.

As shown in fig. 1, on the basis of the above embodiment, the gland 400 is provided with a through hole 420, two ends of the through hole 420 are respectively located on two side surfaces of the gland 400, and one end of the through hole 420 faces to the position where the sealing surface is located. The through hole 420 allows the medium-side sealing surface to be washed or cooled from the outside, i.e., a washing liquid or a cooling liquid can be injected into the through hole 420, thereby washing or cooling the moving ring 300, the stationary ring 500, and the portion where the sealing surface is located.

As shown in fig. 1, in the above embodiment, a gasket 430 is provided on a surface of the gland 400 corresponding to the medium side. When gland 400 is mounted on a cavity structure or apparatus, gasket 430 contacts the corresponding mounting surface to provide a seal.

As shown in fig. 1, in the above embodiment, a first O-ring 140 is provided on the inner circumferential surface of the sleeve 100, a second O-ring 150 is provided between the metal bellows 200 and the sleeve 100, and a third O-ring 440 is provided between the stationary ring 500 and the gland 400. The O-shaped sealing ring has a sealing effect.

As shown in fig. 1, in the above embodiment, the stationary ring 500 and the gland 400 are circumferentially fixed by an anti-rotation pin.

As shown in fig. 1, in the above embodiment, the moving ring 300 is a graphite member. The graphite material has better heat resistance, improves high temperature resistance and ensures that the graphite material is not easy to be worn.

As shown in fig. 1, in the above embodiment, one end of the metal bellows 200 is fixedly connected to the sleeve 100 by a second set screw 210.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims

1. A high temperature and pressure resistant mechanical seal comprising:

the movable assembly comprises a shaft sleeve (100), a metal corrugated pipe (200) and a movable ring (300), wherein the shaft sleeve (100) is sleeved with the metal corrugated pipe (200) and the movable ring (300), one end of the metal corrugated pipe (200) is fixedly connected with the shaft sleeve (100), and the other end of the metal corrugated pipe is connected with the movable ring (300);

the static assembly comprises a gland (400) and a static ring (500), wherein the gland (400) is provided with a stepped hole (410), and the static ring (500) is positioned in the stepped hole (410) and connected with the gland (400);

in a use state, the movable ring (300) is in surface-to-surface contact with the static ring (500) and forms a sealing surface between the movable ring and the static ring, and the metal corrugated pipe (200) is in a compressed state and provides positive pressure for the movable ring (300) to be jointed with the static ring (500).

2. A high temperature and pressure resistant mechanical seal as defined in claim 1, wherein: the shaft sleeve (100) is sleeved with a stop ring (110), and the stop ring (110) is provided with a first set screw (130) penetrating through the shaft sleeve (100) and used for being connected with a rotating shaft so that the shaft sleeve (100) and the rotating shaft rotate together.

3. A high temperature and pressure resistant mechanical seal as defined in claim 2, wherein: the shaft sleeve (100) penetrates through the stationary ring (500), the stop ring (110) and the metal corrugated pipe (200) are respectively located at two ends of the shaft sleeve (100) and distributed on two sides of the gland (400) along the axial direction of the shaft sleeve (100), and the stop ring (110) is in abutting connection with the gland (400).

4. A high temperature and pressure resistant mechanical seal as recited in claim 3, wherein: a backing ring (120) is arranged between the shaft sleeve (100) and the stop ring (110).

5. A high temperature and pressure resistant mechanical seal as defined in claim 1, wherein: the gland (400) is provided with a through hole (420), two ends of the through hole (420) are respectively positioned on two side surfaces of the gland (400), and one end of the through hole (420) faces to the position where the sealing surface is positioned.

6. A high temperature and pressure resistant mechanical seal as in claim 1 or 5, wherein: a gasket (430) is arranged on one surface of the gland (400) corresponding to the medium side.

7. A high temperature and pressure resistant mechanical seal as defined in claim 1, wherein: the inner peripheral surface of the shaft sleeve (100) is provided with a first O-shaped sealing ring (140), a second O-shaped sealing ring (150) is arranged between the metal corrugated pipe (200) and the shaft sleeve (100), and a third O-shaped sealing ring (440) is arranged between the static ring (500) and the gland (400).

8. A high temperature and pressure resistant mechanical seal as in claim 1 or 5, wherein: the static ring (500) and the gland (400) are circumferentially fixed through an anti-rotation pin.

9. A high temperature and pressure resistant mechanical seal as defined in claim 1, wherein: the moving ring (300) is a graphite piece.

10. A high temperature and pressure resistant mechanical seal as defined in claim 1, wherein: one end of the metal corrugated pipe (200) is fixedly connected with the shaft sleeve (100) through a second set screw (210).