CN218152357U - Double-end-face mechanical sealing mechanism - Google Patents

Abstract

The utility model relates to a double-ended face mechanical seal mechanism, including the axle sleeve, quiet ring subassembly, the rotating ring subassembly, the gland, flange seat and bearing, the axle sleeve cover is established on the transmission shaft, quiet ring subassembly includes first quiet ring and the quiet ring of second, first quiet ring and the quiet ring spacer of second are established at the axle sleeve middle part, the rotating ring subassembly includes the rotating ring, a spring, spring holder and water jacket, the spring holder setting is between first quiet ring and the quiet ring of second, the water jacket lid closes in the spring holder outside, and with gland and flange seat butt, spring one end is connected with the quiet ring of second, the spring other end is connected with the rotating ring, the one end that the spring was kept away from to the rotating ring is provided with joint portion, joint portion joint is between first quiet ring and spring holder, the bearing housing is established in the axle sleeve upper end, the gland cover is established in the bearing outside. Utilize the spring to drive the rotating ring displacement on the spring holder for the inside and outside both sides medium pressure of rotating ring keeps balance, and the sealed face atress of axle sleeve can diminish or even offset completely along with the rising of medium pressure, has avoided the liquid film to reduce.

Description

Double-end-face mechanical sealing mechanism

Technical Field

The utility model relates to a mechanical seal technical field especially relates to a double mechanical seal mechanism.

Background

The mechanical seal is a shaft seal device which is kept jointed 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 matched with auxiliary seal to achieve leakage resistance. Present double mechanical seal for cauldron commonly used mainly including: the mechanical seal design at two ends of the shaft comprises a bearing, and the cavity is provided with a cooling water jacket which can be connected with cooling water, so that the mechanical seal structure is suitable for working conditions with higher temperature. The pressure of the cooling water acts on the sealing end face, and excessive pressure can reduce liquid film, increase friction and raise the temperature of the end face, so that improvement is needed.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a double mechanical seal mechanism that addresses the above problems.

The utility model provides a bi-polar face mechanical seal mechanism, includes the axle sleeve, quiet ring subassembly, rotating ring subassembly, gland, flange seat and bearing, the axle sleeve cover is established on the transmission shaft, quiet ring subassembly includes first quiet ring and the quiet ring of second, first quiet ring and the quiet ring spacer sleeve of second are established the axle sleeve middle part, the flange seat cover is established the axle sleeve lower extreme, the rotating ring subassembly includes the rotating ring, the spring, spring holder and water jacket, the spring holder sets up between first quiet ring and the quiet ring of second, the water jacket lid closes the spring holder outside, and with gland and flange seat butt, spring one end with the quiet ring of second is connected, the spring other end with the rotating ring is connected, the rotating ring is kept away from the one end of spring is provided with joint portion, joint portion joint is in between first quiet ring and the spring holder, the bearing housing is established the axle sleeve upper end, the gland is established the bearing outside.

Preferably, the upper end and the lower end of the shaft sleeve are respectively provided with a steel sleeve, and the steel sleeves are abutted against the outer sides of the second stationary ring and the bearing.

Preferably, the two side faces of the spring seat are respectively provided with a sealing ring, and the sealing rings are movably abutted against the shaft sleeve and the movable ring.

Preferably, the sealing ring is made of polytetrafluoroethylene.

Preferably, the gland is connected with the flange seat through a screw.

The utility model discloses an useful part lies in: the clamping part of the movable ring is clamped between the first stationary ring and the spring seat, the spring is utilized to drive the movable ring to move on the spring seat, the balance type design is adopted, medium pressure on the inner side and the outer side of the movable ring keeps balance, the stress of the sealing surface of the shaft sleeve can be reduced along with the rising of the medium pressure, and even can be completely offset, so that the reduction of a liquid film is avoided, and the friction is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a double-end mechanical sealing mechanism according to an embodiment.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a double-end-face mechanical sealing mechanism includes a shaft sleeve 1, a stationary ring assembly 2, a moving ring assembly 3, a gland 4, a flange seat 5 and a bearing 6, the shaft sleeve 1 is sleeved on a transmission shaft 100, the stationary ring assembly 2 includes a first stationary ring 21 and a second stationary ring 22, the first stationary ring 21 and the second stationary ring 22 are sleeved at the middle of the shaft sleeve 1 at intervals, the flange seat 5 is sleeved at the lower end of the shaft sleeve 1, the moving ring assembly 3 includes a moving ring 31, a spring 32, a spring seat 33 and a water jacket 34, the spring seat 33 is disposed between the first stationary ring 21 and the second stationary ring 22, the water jacket 34 covers the outer side of the spring seat 33 and is abutted against the gland 4 and the flange seat 5, one end of the spring 32 is connected with the second stationary ring 22, the other end of the spring 32 is connected with the moving ring 31, one end of the moving ring 31 far away from the spring 32 is provided with a clamping portion 311, the clamping portion 311 is clamped between the first stationary ring 21 and the spring seat 33, the upper end of the shaft sleeve 1 is sleeved on the bearing 6, and the outer side of the gland 4 is sleeved on the bearing 6. Specifically, in this embodiment, the shaft sleeve 1 is sleeved on the transmission shaft 100 to wrap the transmission shaft 100, thereby achieving a protection effect. The first stationary ring 21 and the second stationary ring 22 are sleeved on the shaft sleeve 1 at intervals, an installation space is reserved for the movable ring assembly 3, the stationary ring assembly 2 is used for sealing two ends of the movable ring assembly, sealing is reliable, and leakage is avoided or reduced in a long service life. Clean, no dead angle, and can prevent the contamination of mixed bacteria. The moving ring assembly 3 comprises a moving ring 31, a spring 32, a spring seat 33 and a water jacket 34, the spring seat 33 is covered by the water jacket 34, and a medium hole is reserved in the water jacket 34, so that a medium can be conveniently introduced into the moving ring assembly 3, and the medium pressure on two sides of the moving ring 31 is kept balanced. The specific principle is that the pressure of the sealing fluid and the axial force caused by the elasticity of the elastic element (sealing ring) arranged in the sealing fluid make the movable ring 31 and the first stationary ring 21 and the second stationary ring 22 mutually attached and move relatively, and a tiny gap is formed at the junction between the sealing end faces due to the tight fit of the two sealing end faces, so that when a pressure medium passes through the gap, an extremely thin liquid film can be formed, resistance is generated, medium leakage is prevented, and meanwhile, the end faces can be lubricated by the liquid film, and a long-term sealing effect is obtained. And set up joint portion 311 at rotating ring 31 tip in this application, can effectively avoid the inboard liquid film of rotating ring 31 to reduce, lead to the friction increase. Flange seat 5 cooperation gland 4 protection axle sleeve 1 both ends to utilize flange seat 5 to be connected with other mechanisms, gland 4 can prevent that impurity from getting into in the bearing 6, leading to bearing 6 operation to block.

As shown in fig. 1, a steel sleeve 7 is provided at each of the upper and lower ends of the sleeve 1, and the steel sleeve 7 abuts against the second stationary ring 22 and the outer side of the bearing 6. In particular, the steel sleeve 7 may be axially positioned to reduce wear and vibration, and may also serve to isolate the drive shaft 100 from harmful media, thereby extending the life and durability of the drive shaft.

As shown in fig. 1, two side surfaces of the spring seat 33 are both provided with a sealing ring 331, the sealing ring 331 is movably abutted against the shaft sleeve 1 and the movable ring 31, two ends of the shaft sleeve 1 are sealed by the sealing ring 331 to prevent a medium from leaking, and the sealing ring 331 is made of polytetrafluoroethylene.

As shown in fig. 1, the gland 4 is connected with the flange seat 5 through the screw 8, and the gland 4 and the flange seat 5 are tightened to enable the gland to be matched more tightly, so that the phenomenon that the gland and the flange seat are loosened for a long time and are in clearance fit to reduce the mechanical sealing effect is avoided.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (5)

1. A double mechanical seal mechanism which characterized in that: including the axle sleeve, quiet ring subassembly, rotating ring subassembly, gland, flange seat and bearing, the axle sleeve cover is established on the transmission shaft, quiet ring subassembly includes first quiet ring and the quiet ring of second, first quiet ring and the quiet ring spacer sleeve of second are established the axle sleeve middle part, the flange seat cover is established the axle sleeve lower extreme, the rotating ring subassembly includes rotating ring, spring holder and water jacket, the spring holder sets up between first quiet ring and the quiet ring of second, the water jacket lid closes the spring holder outside, and with gland and flange seat butt, spring one end with the quiet ring of second is connected, the spring other end with the rotating ring is connected, the rotating ring is kept away from the one end of spring is provided with joint portion, joint portion joint is in between first quiet ring and the spring holder, the bearing housing is established the axle sleeve upper end, the gland cover is established the bearing outside.

2. A double mechanical seal mechanism according to claim 1 wherein: and the upper end and the lower end of the shaft sleeve are respectively provided with a steel sleeve, and the steel sleeves are abutted against the outer sides of the second stationary ring and the bearing.

3. A double mechanical seal mechanism according to claim 1 wherein: and sealing rings are arranged on two side surfaces of the spring seat and movably abutted against the shaft sleeve and the movable ring.

4. A double mechanical seal according to claim 3 wherein: the sealing ring is made of polytetrafluoroethylene.

5. A double mechanical seal according to claim 1, wherein: the gland is connected with the flange seat through a screw.

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