CN218510176U - Mechanical sealing device and centrifugal pump - Google Patents

Abstract

The utility model relates to a mechanical seal device and centrifugal pump. Mechanical seal device include: establish and fix axle sleeve, cover on the main shaft including the cover and establish and be in on the axle sleeve and circumference is spacing rotating ring on the axle sleeve, along keeping away from the rotating ring direction is fixed stationary ring seat and spring cassette, cover with equipment casing connection in proper order and is established on the axle sleeve and circumference are spacing be in on the stationary ring seat and one end and the sealed stationary ring of rotating ring end face contact, one end and stationary ring keep away from that the rotating ring one end offsets and the other end offsets with the inner wall of spring cassette spring, cover are located and are close to spring holder one end on the axle sleeve and circumference spacing be in wear-resisting bush on the axle sleeve with set up in the oil blanket between spring cassette and the wear-resisting bush. The utility model provides a mechanical sealing device, its life that can prolong the axle sleeve reduces cost of maintenance, saves maintenance duration and the steady operation of maintenance equipment.

Description

Mechanical sealing device and centrifugal pump

Technical Field

The utility model relates to a mechanical seal field especially relates to a mechanical seal device and centrifugal pump.

Background

The 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 which keeps fit and relative sliding under the action of fluid pressure and the elasticity (or magnetic force) of a compensation mechanism and the cooperation of auxiliary seal. The single-end face cartridge mechanical seal (single-end face cartridge mechanical seal) has the advantages of quick installation, no need of adjusting the end face specific pressure, greatly reduced installation human errors, reduced faults, improved maintenance efficiency and wide application in shaft sealing devices of rotary machines such as centrifugal pumps and the like.

Referring to fig. 1-2, a schematic diagram of a conventional single-end face container type mechanical seal structure includes a shaft sleeve 11 sleeved and fixed on a main shaft, a movable ring 12 sleeved on the shaft sleeve 11 and circumferentially limited on the shaft sleeve 11, a stationary ring seat 14 and a spring clamp seat 16 sequentially connected and fixed with an apparatus body along a direction away from the movable ring 12, a stationary ring 13 sleeved on the shaft 11 and circumferentially limited on the stationary ring seat 14, a spring 15 arranged between the stationary ring 13 and the spring clamp seat 16, and an oil seal 17 arranged between the spring clamp seat 16 and the shaft sleeve 11. One end of the spring 15 is abutted against the end face of the stationary ring 13 far away from the end of the movable ring, the other end is abutted against the inner end face of the spring clamping seat 16, and the movable ring 12 and the stationary ring 13 are in a press fit (namely, are tightly attached) state. The shaft sleeve 11, the movable ring 12, the fixed ring 13, the fixed ring seat 14, the spring 15, the spring clamping seat 16 and the oil seal 17 form a closed cooling water flowing cavity. The shaft sleeve 11 and the main shaft, the movable ring 12 and the shaft sleeve 11, the static ring 13 and the static ring seat 14, the static ring seat 14 and the spring clamping seat 16 are in a sealing state.

When the device starts to work, the shaft sleeve 11 and the movable ring 12 are driven by the shaft sleeve to simultaneously rotate along with the rotation of the main shaft, the static ring 13 does not rotate along with the main shaft, and one end of the static ring and the movable ring 12 are in press fit to form a friction pair under the extrusion action of the spring 15. The friction between the movable ring 12 and the static ring 13 can generate heat, the heat generated by the friction pair in the running process of the equipment is taken away by introducing cooling water into a cooling water flowing cavity, and the oil seal 17 is arranged between the spring seat 16 and the shaft sleeve 11 to prevent the cooling water from leaking outwards.

Oil blanket 17 and axle sleeve 11 direct contact, along with the extension of live time or installation maintenance precision not enough cause the main shaft unbalance scheduling problem, often can lead to the wearing and tearing of axle sleeve 11, produce the cooling water and reveal, the vice cooling of friction is not enough dry grinding and is generated heat, damages the friction pair, destroys mechanical seal's leakproofness, causes the frequent maintenance of equipment (change mechanical seal or axle sleeve), has both influenced the device operation and has increased cost of maintenance again.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a mechanical seal device, its life that can prolong the axle sleeve reduces cost of maintenance, saves maintenance duration and the steady operation of holding device.

The utility model provides a mechanical sealing device, establishes and fixes axle sleeve, cover on the main shaft including the cover and establishes and the circumference is spacing on the axle sleeve rotating ring, along keeping away from the rotating ring direction in proper order with equipment casing be connected fixed quiet ring seat and spring cassette, cover establish on the axle sleeve and circumference spacing be in on the quiet ring seat and one end and the sealed quiet ring of rotating ring end face contact, one end and quiet ring keep away from the spring that rotating ring one end offseted and the other end and spring cassette's inner wall offseted, the cover is located and is close to spring holder one end the epaxial and circumference spacing be in wear-resisting bush on the axle sleeve with set up in the oil blanket between spring cassette and the wear-resisting bush, form a cooling water flow chamber between axle sleeve, rotating ring, quiet ring seat, spring cassette, wear-resisting bush and the oil blanket.

The utility model discloses increase a wear-resisting bush between axle sleeve and oil blanket, the bush is fixed with the axle sleeve, and the main shaft is rotatory to drive wear-resisting bush synchronous revolution, changes the friction between axle sleeve and the oil blanket into the friction of wear-resisting bush and oil blanket, and when wear-resisting bush produced wearing and tearing, only need to be changed wear-resisting bush can. Compared with the prior art that the shaft sleeve needs to be replaced, the cost for replacing the wear-resistant bushing is greatly reduced, and the maintenance work is greatly reduced. The wear-resistant bushing has the advantages of being obvious to large-scale equipment, low in cost and simple to replace, can be used as a consumable, can be replaced periodically, effectively maintains the running stability of the equipment, and prolongs the service life of the equipment.

Further, the inner wall of the wear-resistant lining is provided with a sealing groove, and a sealing ring is arranged in the sealing groove. The cooling water is prevented from leaking between the bushing and the wear-resistant bush.

Further, the sealing ring is an O-shaped sealing ring.

Furthermore, a fastening screw hole is formed in the wear-resistant bushing. The wear-resistant bush is fixed on the shaft sleeve through the set screw, and the equipment moves synchronously with the shaft sleeve during operation.

Further, the outer wall of the wear-resistant bushing is provided with an elastic check ring groove, an elastic check ring is arranged in the elastic check ring groove, and an interval is reserved between the elastic check ring and the outer wall of the spring seat. The elastic retainer ring is matched with the wear-resistant bushing and the spring clamping seat, so that the machine seal is prevented from being separated, a margin is reserved, and the end face specific pressure of the movable ring and the stationary ring can be adjusted automatically.

Furthermore, the shaft sleeve is provided with a wear-resistant bushing limiting part, and the wear-resistant bushing limiting part is used for limiting the depth of the wear-resistant bushing sleeved on the shaft sleeve. The replacement and maintenance of the wear-resistant bushing are convenient.

Furthermore, sealing rings are arranged between the movable ring and the shaft sleeve, between the static ring and the static ring seat, and between the static ring seat and the spring clamping seat.

Further, the oil seal is a framework oil seal.

The utility model also provides a centrifugal pump, it includes the aforesaid mechanical seal device.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a cross-sectional view of a prior art mechanical seal.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a sectional view of the mechanical seal device provided in example 1.

Fig. 4 is a schematic structural view of a wear-resistant bush provided in embodiment 1.

Fig. 5 is a schematic structural view of the centrifugal pump provided in embodiment 2.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are the directions or positional relationships indicated on the basis of the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The present embodiment provides a mechanical seal.

Referring to fig. 3-4, the mechanical sealing device 200 includes a shaft sleeve 210 sleeved and fixed on the main shaft, a moving ring 220 sleeved on the shaft sleeve 210 and circumferentially limited on the shaft sleeve 210, a stationary ring seat 230 and a spring clamping seat 240 sequentially connected and fixed with the equipment housing along a direction away from the moving ring 220, a stationary ring 250 sleeved on the shaft sleeve 210 and circumferentially limited on the stationary ring seat 230 and having one end contacting and sealing with an end surface of the moving ring 220, a spring 260 having one end abutting against one end of the stationary ring 250 away from the moving ring 220 and the other end abutting against an inner wall of the spring clamping seat 240, a wear-resistant bushing 270 sleeved on the shaft sleeve 210 near one end of the spring seat 240 and circumferentially limited on the shaft sleeve 210, and a skeleton oil seal 280 disposed between the spring clamping seat 240 and the wear-resistant bushing 270.

And sealing rings 290 are arranged between the dynamic ring 220 and the shaft sleeve 210, between the static ring 250 and the static ring seat 230, and between the static ring seat 230 and the spring clamping seat 240.

Referring to fig. 4, the wear bushing 270 includes a wear bushing body 271.

The inner wall of the wear-resistant bushing body 271 is provided with a sealing groove 272, and an O-shaped sealing ring 273 is arranged in the sealing groove 272.

The outer wall of the wear-resistant bushing body 271 is provided with a circlip groove 274, a circlip 275 is arranged in the circlip groove 274, and a space is reserved between the circlip 275 and the outer wall of the spring seat 240.

The wear-resistant bushing body 271 is provided with a plurality of set screw holes 276, and the wear-resistant bushing 270 is fixed on the shaft sleeve 210 through set screws 277.

Further, be equipped with the spacing portion 211 of wear-resisting bush on the axle sleeve, the spacing portion 211 of wear-resisting bush is used for the restriction wear-resisting bush 270 cover is located the degree of depth on the axle sleeve 210 conveniently changes wear-resisting bush 270, makes wear-resisting bush 270 can be fast accurate the installation target in place.

A sealed cooling water flow cavity is formed among the shaft sleeve 210, the movable ring 220, the static ring seat 230, the spring clamping seat 240, the static ring 250, the spring 260, the wear-resistant bushing 270 and the framework oil seal 280.

Example 2

The present embodiment provides a centrifugal pump.

Referring to fig. 5, the centrifugal pump 300 includes a main shaft 310 and a mechanical seal 200.

The mechanical seal device 200 is mounted on the main shaft 310.

The mechanical seal device 200 is the mechanical seal device described in embodiment 1.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, to those skilled in the art, changes and modifications may be made without departing from the spirit of the invention, and it is intended that the invention also encompass such changes and modifications.

Claims (9)

1. A mechanical seal, characterized by: establish and fix axle sleeve, cover on the main shaft including the cover and establish and be in on the axle sleeve and circumference is spacing movable ring on the axle sleeve, along keeping away from the movable ring direction in proper order with equipment casing be connected fixed quiet ring seat and spring cassette, cover establish on the axle sleeve and circumference spacing be in on the quiet ring seat and one end and the sealed quiet ring of movable ring end face contact, one end and quiet ring keep away from the movable ring one end offset and the other end and the spring that the inner wall of spring cassette offsets, cover are located and are close to spring cassette one end the axle sleeve is gone up and circumference is spacing be in wear-resisting bush on the axle sleeve with set up in oil blanket between spring cassette and the wear-resisting bush, form a cooling water flow chamber between axle sleeve, movable ring, quiet ring seat, spring cassette, wear-resisting bush and the oil blanket.

2. A mechanical seal according to claim 1 wherein: the inner wall of the wear-resistant bushing is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

3. A mechanical seal according to claim 2 wherein: the sealing ring is an O-shaped sealing ring.

4. A mechanical seal according to claim 1 wherein: and the wear-resistant bushing is provided with a fastening screw hole.

5. A mechanical seal according to claim 1 wherein: the outer wall of the wear-resistant lining is provided with an elastic retainer ring groove, an elastic retainer ring is arranged in the elastic retainer ring groove, and an interval is reserved between the elastic retainer ring and the outer wall of the spring clamping seat.

6. A mechanical seal according to claim 1 wherein: the wear-resistant bushing is characterized in that a wear-resistant bushing limiting part is arranged on the shaft sleeve and used for limiting the depth of the wear-resistant bushing sleeved on the shaft sleeve.

7. A mechanical seal according to claim 1 wherein: and sealing rings are arranged between the movable ring and the shaft sleeve, between the static ring and the static ring seat, and between the static ring seat and the spring clamping seat.

8. A mechanical seal according to claim 1 wherein: the oil seal is a framework oil seal.

9. A centrifugal pump characterized by: comprising a mechanical seal according to any one of claims 1-8.

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