CN216767843U - Mechanical sealing device - Google Patents

Abstract

The utility model discloses a mechanical sealing device, which comprises a shaft sleeve connected with a pump shaft, a movable ring seat in transmission connection with the shaft sleeve, a movable ring which is arranged in the movable ring seat and rotates along with the movable ring, a static ring seat connected with a pump body, a static ring which is fixedly arranged in the static ring seat and a compensation mechanism, wherein the movable ring and the static ring form a sealing end surface; the compensation mechanism is arranged at the end part close to the medium side between the shaft sleeve and the movable ring seat and used for elastic compensation; the compensation mechanism comprises a first compensation part close to the medium side and a second compensation part abutted against the first compensation part, the first compensation part comprises a first disc spring and a first wrapping sleeve wrapping the first disc spring, and the second compensation part comprises a second disc spring. The mechanical sealing device provided by the utility model is provided with the compensation mechanism, the compensation mechanism comprises a plurality of compensation pieces, the compensation range and the compensation pressure are enlarged, and the service life of the mechanical sealing device is effectively 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 which is suitable for conveying particles with heavy density, high hardness, high concentration and corrosive media and has higher sealing requirements.

Background

In the equipment such as centrifugal pump, centrifuge, reaction kettle, compressor, etc., because the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, the medium in the equipment leaks outwards through the gap, if the pressure in the equipment is lower than the atmospheric pressure, the air leaks into the equipment, therefore, a shaft sealing device for preventing the leakage is necessary. The shaft seals are of various types, and mechanical seals are widely applied due to the advantages of good sealing performance, long service life, low power loss, difficult abrasion of the surfaces of shafts or shaft sleeves and the like.

The mechanical seal is a shaft seal device which is kept attached by a pair of cartridge mechanical seals or a plurality of pairs of end faces which are vertical to a shaft and slide relatively under the action of fluid pressure and the elasticity (or magnetic force) of a compensation mechanism and is matched with auxiliary seal to achieve leakage resistance, and structures such as a spring, a sealing ring and the like are usually arranged.

When a medium containing heavy-density, high-hardness particles and high-concentration particles is conveyed, impurity particles in the medium are easy to deposit on a spring, a sealing ring and the like, so that a mechanical seal compensation mechanism is jammed, mechanical seal leakage is caused, and mechanical seal failure is directly caused when the jam is serious. When corrosive media are transported, corrosion may also occur to the compensating mechanism of the mechanical seal, resulting in failure of the mechanical seal.

The problem that a compensation mechanism is prone to jamming is often solved by arranging a coating disc spring in the conventional mechanical sealing device, but in the working condition of high pressure, the compensation range of the coating disc spring is small, the compensation pressure is small, the compensation mechanism is still prone to damage, and leakage is prone to occurring in use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mechanical sealing device to solve the problems that in the prior art, a coated disc spring is arranged on the mechanical sealing device, so that the compensation range is small, the compensation pressure is small, and the mechanical sealing device is easy to damage, so that the mechanical sealing fails.

In order to achieve the above purpose, the utility model provides the following technical scheme: a mechanical sealing device comprises a shaft sleeve connected with a pump shaft, a movable ring seat in transmission connection with the shaft sleeve, a movable ring which is arranged in the movable ring seat and rotates along with the movable ring, a static ring seat connected with a pump body, a static ring which is fixedly arranged in the static ring seat and a compensation mechanism, wherein the movable ring and the static ring form a sealing end face;

the movable ring seat is arranged at one end of the shaft sleeve close to the medium side, the static ring seat is arranged at one end of the shaft sleeve far away from the medium side, and the compensation mechanism is arranged at the end part close to the medium side between the shaft sleeve and the movable ring seat and used for elastic compensation;

the compensation mechanism comprises a first compensation piece close to the medium side and a second compensation piece abutted against the first compensation piece, the first compensation piece comprises a first disc spring and a first coating sleeve coating the first disc spring, and the second compensation piece comprises a second disc spring.

Further, the second compensation piece also comprises a second wrapping sleeve wrapping the second disc spring.

Further, the number of the first compensation pieces is one or more and is continuously abutted.

Further, the number of the second compensation pieces is one or more and is continuously abutted.

Further, the first compensation part and the second compensation part are arranged alternately.

Further, the first coating sleeve and the second coating sleeve are one or a combination of more of an acid-resistant rubber sleeve, an alkali-resistant rubber sleeve, an oil-resistant rubber sleeve and a water-resistant rubber sleeve.

Furthermore, the shaft sleeve comprises a first shaft sleeve connected with the pump shaft and a second shaft sleeve connected with the pump shaft, and the second shaft sleeve is sleeved at one end of the first shaft sleeve.

Further, the shaft sleeve further comprises a plurality of first sealing rings arranged between the first shaft sleeve and the second shaft sleeve.

Further, a third sealing ring is arranged between the second shaft sleeve and the movable ring.

Further, the third sealing ring is an O-shaped ring or a spring energy storage ring.

Compared with the prior art, the mechanical sealing device provided by the utility model has the following advantages:

the mechanical sealing device provided by the utility model is provided with the compensation mechanism for elastic compensation, the compensation mechanism comprises a plurality of abutted compensation pieces, the elastic compensation force is improved through the continuously arranged compensation pieces, the compensation range and the compensation pressure are increased, the use requirement under a high-pressure working condition is met, and the service life of the mechanical sealing device can be effectively prolonged.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. In the drawings:

fig. 1 is a schematic structural view of a mechanical seal device according to embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a mechanical sealing device according to embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a mechanical seal device according to example 3 of the present invention;

fig. 4 is a schematic structural diagram of a mechanical sealing device according to embodiment 4 of the present invention.

Reference numerals:

the device comprises a shaft sleeve 1, a first shaft sleeve 11, a second shaft sleeve 12, a first sealing ring 13, a movable ring seat 2, a second sealing ring 21, a movable ring 3, a third sealing ring 31, a stationary ring seat 4, a fourth sealing ring 41, a stationary ring 5, a compensation mechanism 6, a first compensation part 61, a first disc spring 611, a first wrapping sleeve 612, a second compensation part 62, a second disc spring 621, a second wrapping sleeve 622 and a transmission key 7.

Detailed Description

The present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific examples described in the following embodiments of the present invention are merely illustrative of specific embodiments of the present invention and do not limit the scope of the utility model.

The utility model is further described with reference to the following figures and detailed description of embodiments.

Example 1

As shown in fig. 1, fig. 1 is a schematic structural diagram of a mechanical sealing device according to embodiment 1 of the present invention.

The embodiment provides a mechanical sealing device, which is suitable for conveying equipment containing heavy-density particles, high-hardness particles, high-concentration particles, corrosive media and high sealing requirements (such as high-pressure working conditions), and is particularly suitable for conveying acid-base equipment containing impurities.

The mechanical sealing device comprises a shaft sleeve 1 connected with a pump shaft, a movable ring seat 2 in transmission connection with the shaft sleeve 1, a movable ring 3 which is arranged in the movable ring seat 2 and rotates along with the movable ring, a static ring seat 4 connected with a pump body, a static ring 5 fixedly arranged in the static ring seat 4 and a compensating mechanism 6, wherein the movable ring 3 and the static ring 5 form a sealing end face;

the movable ring seat 2 is arranged at one end of the shaft sleeve 1 close to the medium side, the static ring seat 4 is arranged at one end of the shaft sleeve 1 far away from the medium side, and the compensation mechanism 6 is arranged at the end part between the shaft sleeve 1 and the movable ring seat 2 close to the medium side and used for elastic compensation;

the compensation mechanism 6 includes a first compensation member 61 near the medium side, and a second compensation member 62 abutting against the first compensation member 61, the first compensation member 61 includes a first disc spring 611, a first cover 612 covering the first disc spring 611, and the second compensation member 62 includes a second disc spring 621.

The application provides a mechanical seal device is equipped with compensation mechanism and is used for the elastic compensation, and compensation mechanism includes the compensating part of a plurality of butts, improves the elastic compensation power through the compensating part that sets up in succession, has increased compensation range and compensation pressure, satisfies the operation requirement under the high pressure operating mode, can effectively prolong mechanical seal device's life.

As shown in fig. 1, the shaft sleeve 1 includes a first shaft sleeve 11 connected to the pump shaft and a second shaft sleeve 12 connected to the pump shaft, and the second shaft sleeve 12 is sleeved on one end of the first shaft sleeve 11. The first shaft sleeve 11 is arranged at one end of the pump shaft close to the medium side, and the second shaft sleeve 12 is arranged at one end of the pump shaft close to the atmosphere side, namely, the end far away from the medium side.

The shaft sleeve 1 is divided into two parts, and the second shaft sleeve 12 moves leftwards or rightwards according to actual conditions so as to provide different pressing quantities. Of course, in other embodiments, the number of the shaft sleeves 1 may also be 1, or more than 2.

Further, the shaft sleeve 1 further comprises a plurality of first sealing rings 13 arranged between the first shaft sleeve 11 and the second shaft sleeve 12. First sealing washer 13 is O type circle, U type circle or spring energy storage circle, in this embodiment, first sealing washer 13 is O type circle, and quantity is two, plays double sealing and supporting axle sleeve 1's effect, has strengthened the ability of resisting strong impact, has avoided causing sealed complete failure after the single sealing washer became invalid, improves sealed reliability. Of course, in other embodiments, there may be one first sealing ring 13, or 3 or more first sealing rings.

The movable ring seat 2 is used for installing the movable ring 3, and the shaft sleeve 1 is in transmission connection with the movable ring seat 2 through a transmission key 7. Specifically, the second shaft sleeve 12 is in transmission connection with the moving ring seat 2 through the transmission key 7, so that the moving ring seat 2 rotates with the pump shaft under the driving of the second shaft sleeve 12.

A second sealing ring 21 is arranged at a gap between the movable ring seat 2 and the movable ring 3 and used for assisting sealing, so that the medium is effectively prevented from leaking to the atmosphere side from the gap, and as static sealing, even if the medium contains high-concentration particle impurities, the sealing performance of the medium cannot be adversely affected. The second sealing ring 21 may be an O-ring structure, or may select other sealing types such as a sealing gasket, a spring energy storage ring, and the like.

Further, a third sealing ring 31 is arranged between the second shaft sleeve 12 and the movable ring 3. Third sealing washer 31 is existing right rotating ring 3 plays the effect of supporting the aligning, also has supplementary sealed effect, prevents that external impurity from getting into compensating mechanism 6 also prevents compensating mechanism 6 sealing failure back, the inside medium of equipment outwards reveals.

Further, the third sealing ring 31 is an O-ring or a spring energy storage ring, so that the sealing performance is better, and even if the compensation mechanism 6 fails to seal, the third sealing ring 31 can still play a good sealing role.

The quiet ring holder 4 is used for the installation quiet ring 5, quiet ring holder 4 with the gap department of quiet ring 5 is equipped with fourth sealing washer 41 for supplementary seal prevents effectively that the medium from here from leaking to the atmosphere side, as quiet sealing, even the medium contains high concentration granule impurity, also can not cause adverse effect to its sealing performance. The fourth sealing ring 41 may be an O-ring structure, or may select other sealing types such as a sealing gasket, a spring energy storage ring, and the like.

The compensation mechanism 6 is used for providing elastic compensation for the moving ring seat 2, so that the moving ring 3 is tightly contacted with the static ring 5 to complete sealing in a matching way.

The first compensation part 61 is a coated disc spring, and has a sealing function and an elastic compensation function. Specifically, the first disc spring 611 and the first cover 612 covering the first disc spring 611 are included, and the first cover 612 prevents leakage between the first disc spring 611 and the moving ring seat 2, that is, the first compensator 61 is firstly in contact with the medium.

The first disc spring 611 is a disc spring and is also called a Belleville spring washer, the first disc spring is conical disc-shaped, the load is large, the stroke is short, the required space is small, the combination and the use are convenient, the maintenance and the replacement are easy, the economic safety is high, the device is suitable for precise heavy machinery with small space and large load, and the optimal application range of the compression stroke of the device is 10% -75% of the maximum compression stroke of the device.

The first covering sleeve 612 is one or a combination of more of an acid-resistant rubber sleeve, an alkali-resistant rubber sleeve, an oil-resistant rubber sleeve and a water-resistant rubber sleeve, and plays a role in sealing after being compressed. According to the properties of the conveying medium, such as acidity and alkalinity, chemical properties and particle hardness in the medium, coating materials with different properties are selected, and premature aging and failure of the coating materials are avoided.

The inner side of the first compensating part 61 abuts against the outer side of the second shaft sleeve 12, the outer side of the first compensating part 61 abuts against the inner side of the movable ring seat 2, and when the first compensating part abuts against the inner side of the movable ring seat 2, the second shaft sleeve 12 and the movable ring seat 2 are both provided with grooves which just accommodate the first compensating part 61.

In this embodiment, the second compensation member 62 further includes a second cover 622 covering the second disc spring 621, that is, the second compensation member 62 also covers the disc spring, and has a sealing function and an elastic compensation function.

The second coating sleeve 622 is one or a combination of more of an acid-resistant rubber sleeve, an alkali-resistant rubber sleeve, an oil-resistant rubber sleeve and a water-resistant rubber sleeve, and plays a role in sealing after being compressed. According to the properties of the conveying medium, such as acidity and alkalinity, chemical properties and particle hardness in the medium, coating materials with different properties are selected, and premature aging and failure of the coating materials are avoided.

The inner side of the second compensating part 62 abuts against the outer side of the second shaft sleeve 12, the outer side of the second compensating part 62 abuts against the inner side of the moving ring seat 2, and when the second shaft sleeve 12 and the moving ring seat 2 abut against each other, grooves which just contain the second compensating part 62 are formed in the second shaft sleeve 12 and the moving ring seat 2.

In this embodiment, there is one first compensating member 61 and one second compensating member 62, and the first compensating member 61 and the second compensating member 62 are abutted, that is, continuously disposed; the first disc spring 611 is identical to the second disc spring 621, and the first cover 612 is identical to the second cover 622.

Of course, in other embodiments, the first disc spring 611 may be different from the second disc spring 621, or the first cover 612 may be different from the second cover 622, or the first disc spring 611 may be different from the second disc spring 621, and the first cover 612 may be different from the second cover 622; the first compensator 61 may be provided in plurality and continuously in contact with each other, the second compensator 62 may be provided in plurality and continuously in contact with each other, and the first compensator 61 and the second compensator 62 may be alternately provided. When there are a plurality of the first compensating members 61 and the second compensating members 62, the first belleville spring 611 may be partially the same as or partially different from the second belleville spring 621, or the first cover 612 may be partially the same as or partially different from the second cover 622, or the first belleville spring 611 may be partially the same as or partially different from the second belleville spring 621, and the first cover 612 and the second cover 622, and may be arranged according to specific compensating pressure requirements, and the larger the number of the first compensating members 61 and the second compensating members 62, the larger the compensating range, and the larger the compensating pressure.

Example 2

As shown in fig. 2, fig. 2 is a schematic structural diagram of a mechanical sealing device according to embodiment 2 of the present invention.

Compared with example 1, example 2 provides the mechanical sealing device with the following differences: the second compensation members 62 are two and are disposed in continuous abutting contact.

Example 3

As shown in fig. 3, fig. 3 is a schematic structural diagram of a mechanical sealing device according to embodiment 3 of the present invention.

Compared with example 1, example 3 provides the mechanical sealing device with the following differences: the second compensating part 62 is one, only includes the second disc spring 621, that is, the second disc spring is an uncoated disc spring, and only plays a role in elastic compensation, and the uncoated disc spring is thinner, so that the sealing performance is ensured, the elastic compensation force is improved, the space is saved, and the size of the whole mechanical sealing device is smaller.

Example 4

As shown in fig. 4, fig. 4 is a schematic structural diagram of a mechanical sealing device according to embodiment 4 of the present invention.

Example 4 provides the mechanical seal device different from example 1 only in that: the number of the second compensation members 62 is two, and each of the second compensation members 62 includes only the second disc spring 621, i.e. the disc spring is not covered. Of course, in other embodiments, the second compensation element 62 may be a plurality of, and may have both the coated disc spring and the uncoated disc spring, which are continuously abutted.

In the above description of the present specification, the terms "fixed," "mounted," "connected," and the like are to be construed broadly unless otherwise explicitly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless the specification explicitly defines otherwise, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

From the above description of the present specification, those skilled in the art will also understand the terms used below, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, it is used for convenience in explanation of the utility model and for simplicity of description only, and does not explicitly or implicitly indicate that the device or element concerned must be of the particular orientation described, constructed and operated, therefore, the above terms of orientation or positional relationship should not be construed or interpreted as limiting the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "plurality" means at least two, for example, two, three or more, and the like, unless explicitly specified otherwise.

It should be noted that the above-mentioned embodiments illustrate rather than limit the utility model, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim.

Claims (10)

1. A mechanical sealing device is characterized by comprising a shaft sleeve (1) connected with a pump shaft, a movable ring seat (2) in transmission connection with the shaft sleeve (1), a movable ring (3) installed in the movable ring seat (2) and rotating along with the movable ring, a fixed ring seat (4) connected with a pump body, a fixed ring (5) fixedly installed in the fixed ring seat (4), and a compensation mechanism (6), wherein the movable ring (3) and the fixed ring (5) form a sealing end face;

the movable ring seat (2) is arranged at one end, close to the medium side, of the shaft sleeve (1), the static ring seat (4) is arranged at one end, far away from the medium side, of the shaft sleeve (1), and the compensation mechanism (6) is arranged at the end, close to the medium side, between the shaft sleeve (1) and the movable ring seat (2) and used for elastic compensation;

the compensation mechanism (6) comprises a first compensation part (61) close to the medium side and a second compensation part (62) abutted against the first compensation part (61), wherein the first compensation part (61) comprises a first disc spring (611) and a first coating sleeve (612) coating the first disc spring (611), and the second compensation part (62) comprises a second disc spring (621).

2. A mechanical sealing arrangement according to claim 1, wherein the second compensator (62) further comprises a second casing (622) surrounding the second disc spring (621).

3. A mechanical sealing arrangement according to claim 1, characterized in that the number of first compensators (61) is one, or several and arranged in successive abutment.

4. A mechanical seal according to claim 1, characterized in that the number of second compensators (62) is one or more and arranged in successive abutment.

5. A mechanical seal according to claim 1, wherein the first and second compensators (61, 62) are arranged alternately.

6. A mechanical seal according to claim 2, wherein the first (612) and second (622) sheaths are a combination of one or more of acid-resistant rubber sheath, alkali-resistant rubber sheath, oil-resistant rubber sheath, and water-resistant rubber sheath.

7. A mechanical sealing arrangement according to claim 1, characterized in that the shaft sleeve (1) comprises a first shaft sleeve (11) connected to the pump shaft and a second shaft sleeve (12) connected to the pump shaft, the second shaft sleeve (12) being fitted over one end of the first shaft sleeve (11).

8. A mechanical sealing arrangement according to claim 7, characterized in that the sleeve (1) further comprises a number of first sealing rings (13) arranged between the first sleeve (11) and the second sleeve (12).

9. A mechanical sealing arrangement according to claim 7, characterized in that a third sealing ring (31) is arranged between the second sleeve (12) and the rotating ring (3).

10. A mechanical sealing arrangement according to claim 9, characterized in that the third sealing ring (31) is an O-ring or a spring-loaded ring.

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