CN217874172U - Multistage mechanical seal for pump - Google Patents

Abstract

The utility model relates to a mechanical seal technical field especially relates to a multistage mechanical seal for pump. The technical scheme comprises the following steps: the sealing device comprises a movable ring, a fixed ring and an elastic element arranged between the movable ring and the fixed ring, wherein the inner circumferential surface of the movable ring is provided with a multi-stage sealing structure; the multistage sealing structure comprises a plurality of check grooves and a plurality of O-shaped sealing rings which are sequentially arranged on the inner circumferential surface of the movable ring from left to right. The non-return grooves are obliquely arranged, the groove depth of each non-return groove is 3-4 mm, and the distance between every two adjacent non-return grooves is 2-3.5 mm. And an O-shaped sealing ring is arranged on the inner circumferential surface of the movable ring, and the check grooves are sequentially fixed in the O-shaped sealing ring. The utility model forms a reverse blocking structure through the oblique arrangement of the non-return groove, increases resistance for leakage, and is used for reducing the overflow of fluid or gas; and a plurality of check grooves and the auxiliary sealing ring B are matched to form a multi-stage sealing structure, so that the sealing effect is further improved, and the sealing effect is improved.

Description

Multistage mechanical seal for pump

Technical Field

The utility model relates to a mechanical seal technical field especially relates to a multistage mechanical seal is used to pump.

Background

The mechanical seal (mechanical seal) is a device for preventing fluid leakage, which is composed of at least one pair of end faces perpendicular to the rotation axis, and the end faces are kept in contact and relatively slide under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal.

The elastic loading mechanism and the auxiliary seal are mechanical seals of metal corrugated pipes, which are called metal corrugated pipe seals. In light sealing, a rubber corrugated pipe is used as auxiliary sealing, the elasticity of the rubber corrugated pipe is limited, and a spring is generally required to be supplemented to meet the loading elasticity. "mechanical seal" is often referred to by one simply as "mechanical seal".

The mechanical seal is a shaft seal device of a rotating machine. Such as centrifugal pumps, centrifuges, reaction kettles, compressors, and the like. Since the drive shaft extends through the apparatus, so that there is a circumferential gap between the shaft and the apparatus through which the medium in the apparatus leaks outwards, and if the pressure in the apparatus is below atmospheric pressure, air leaks into the apparatus, a leak-proof shaft seal arrangement is necessary. The shaft seal has many types, and the mechanical seal has the advantages of small leakage amount, long service life and the like, so the mechanical seal is the most important shaft sealing mode in the equipment in the world. Mechanical seals, also called face seals, are defined in the relevant national standards as follows: "means for preventing fluid leakage, which is composed of at least one pair of end faces perpendicular to the rotation axis, and which are kept in fit and relatively slide under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of the auxiliary seal. "

When the existing mechanical seal is used for sealing, the shaft seal is carried out through only one sealing ring, the shaft seal effect is poor after long-time operation, and the possibility of leakage is increased, so that the mechanical seal capable of carrying out multi-stage sealing is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a to the long-time work that exists among the background art leads to the bearing seal effect variation, the problem that the possibility of revealing increases thereupon, provide one kind and can carry out multistage sealed mechanical seal.

The technical scheme of the utility model: a multi-stage mechanical seal for a pump comprises a movable ring, a fixed ring and an elastic element arranged between the movable ring and the fixed ring, wherein the inner circumferential surface of the movable ring is provided with a multi-stage sealing structure;

the multistage sealing structure comprises a plurality of check grooves and a plurality of O-shaped sealing rings which are sequentially arranged on the inner circumferential surface of the movable ring from left to right.

Preferably, the check grooves are obliquely arranged, the groove depth of each check groove is 3-4 mm, and the distance between every two adjacent check grooves is 2-3.5 mm.

Preferably, an O-ring is disposed on an inner circumferential surface of the movable ring, and the plurality of non-return grooves are sequentially fixed in the O-ring.

Preferably, an annular sealing groove is formed in the inner circumferential surface of the movable ring, and an auxiliary sealing ring B is arranged in the annular sealing groove.

Preferably, an auxiliary sealing ring a is arranged on the outer circumferential surface of the rotating ring.

Preferably, an annular positioning groove is formed in the surface of one side, facing the fixed ring, of the movable ring, and a positioning rod matched with the annular positioning groove is fixed on the fixed ring.

Preferably, the outer circumference of the fixed ring is provided with a positioning bolt hole for fixing the fixed ring.

Preferably, one end of the elastic element is fixed on the fixed ring.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model forms a reverse blocking structure through the oblique arrangement of the non-return groove, increases resistance for leakage, and is used for reducing the overflow of fluid or gas; and a plurality of check grooves and the auxiliary sealing ring B are matched to form a multi-stage sealing structure, so that the sealing effect is further improved, and the sealing effect is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a front view of the present invention;

fig. 3 is a front sectional view of the present invention;

fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Reference numerals: 100. a moving ring; 110. an annular mounting groove; 120. an O-shaped sealing ring; 130. a non-return groove;

200. an elastic element;

300. fixing a ring;

400. an auxiliary sealing ring A;

500. positioning the bolt hole;

600. an auxiliary seal ring B;

700. an annular positioning groove;

800. and (5) positioning the rod.

Detailed Description

The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.

Examples

As shown in fig. 1-4, the present invention provides a multi-stage mechanical seal for a pump, which includes a moving ring 100, a stationary ring 300, and an elastic element 200 installed between the moving ring 100 and the stationary ring 300, wherein the inner circumferential surface of the moving ring 100 is provided with a multi-stage sealing structure;

the multistage sealing structure includes a plurality of check grooves 130 and a plurality of O-rings 120 sequentially arranged from left to right on the inner circumferential surface of the rotating ring 100. The plurality of non-return grooves 130 are arranged in parallel or at intervals, and the non-return grooves 130 are in contact with the circumferential surface of the shaft body, so that the effect of multiple sealing is achieved;

the plurality of non-return grooves 130 are obliquely arranged, the depth of each non-return groove 130 is 3 mm-4 mm, and the distance between every two adjacent non-return grooves 130 is 2 mm-3.5 mm. The oblique arrangement of the non-return groove 130 forms a non-return structure, which increases resistance for leakage and is used for reducing the overflow of fluid or gas;

an O-ring 120 is provided on an inner circumferential surface of the rotating ring 100, and a plurality of check grooves 130 are sequentially fixed in the O-ring 120. The O-ring 120 provides a mounting position for the installation of the non-return groove 130, and the groove depth is set according to the cross-sectional diameter of the non-return groove 130, so that the O-ring 120 and the non-return groove 130 form an interference fit structure, and further the O-ring 120 and the shaft body are tightly attached.

An annular sealing groove is formed in the inner circumferential surface of the movable ring 100, and an auxiliary sealing ring B600 is arranged in the annular sealing groove. The escape of fluid or gas is avoided by the provision of the auxiliary seal B600.

The outer circumferential surface of the rotating ring 100 is provided with an auxiliary seal ring a400.

The surface of one side of the movable ring 100 facing the fixed ring 300 is provided with an annular positioning groove 700, and the fixed ring 300 is fixed with a positioning rod 800 matched with the annular positioning groove 700. The elastic element 200 is kept stable in the process of jacking through the annular positioning groove 700 and the positioning rod 800.

The outer circumferential surface of the stationary ring 300 is processed with a positioning key hole 500 for fixing the stationary ring 300. The fixing ring 300 can be fixed by fitting the positioning bolt hole 500 into an external bolt.

One end of the elastic member 200 is fixed to the stationary ring 300. The position of the elastic member 200 can be maintained by fixing the elastic member 200 to the stationary ring 300.

The working principle of the multi-stage mechanical seal for the pump based on the embodiment is as follows: the reverse blocking structure is formed by the oblique arrangement of the non-return groove 130, so that the resistance is increased for leakage, and the overflow of fluid or gas is reduced; and a multi-stage sealing structure is formed by matching with the plurality of non-return grooves 130 and the auxiliary sealing ring B600, so that the sealing effect is further improved, and the sealing effect is improved.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically coupled, may be directly coupled, or may be indirectly coupled through an intermediary. The specific meaning of the above terms in the present invention is understood by those of ordinary skill in the art according to the specific circumstances.

The above embodiments are merely one or more preferred embodiments of the present invention, and many alternative modifications and combinations can be made to the above embodiments by those skilled in the art based on the technical solution of the present invention and the related teachings of the above embodiments.

Claims (8)

1. A multistage mechanical seal for a pump, comprising a moving ring (100), a stationary ring (300), and an elastic element (200) installed between the moving ring (100) and the stationary ring (300), characterized in that: the inner circumferential surface of the movable ring (100) is provided with a multi-stage sealing structure;

the multistage sealing structure comprises a plurality of non-return grooves (130) and a plurality of O-shaped sealing rings (120) which are sequentially arranged on the inner circumferential surface of the movable ring (100) from left to right.

2. The multistage mechanical seal for the pump according to claim 1, wherein the non-return grooves (130) are obliquely arranged, the groove depth of the non-return grooves (130) is 3mm to 4mm, and the distance between two adjacent non-return grooves (130) is 2mm to 3.5mm.

3. The multistage mechanical seal for a pump according to claim 1, wherein an O-ring (120) is provided on an inner circumferential surface of the rotating ring (100), and a plurality of the non-return grooves (130) are sequentially fixed in the O-ring (120).

4. The multistage mechanical seal for the pump according to any one of claims 1 to 3, wherein an annular seal groove is formed in the inner circumferential surface of the rotating ring (100), and an auxiliary seal ring B (600) is arranged in the annular seal groove.

5. The multistage mechanical seal for pumps of claim 4, characterized in that the outer circumferential surface of the rotating ring (100) is provided with an auxiliary seal ring A (400).

6. The multistage mechanical seal for the pump according to claim 1, wherein a side surface of the movable ring (100) facing the fixed ring (300) is provided with an annular positioning groove (700), and the fixed ring (300) is fixed with a positioning rod (800) matched with the annular positioning groove (700).

7. The multistage mechanical seal for a pump according to claim 6, wherein the outer circumferential surface of the stationary ring (300) is formed with a positioning key hole (500) for fixing the stationary ring (300).

8. The multistage mechanical seal for pumps according to claim 1, characterized in that one end of said elastic element (200) is fixed to a stationary ring (300).

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