CN215890576U

CN215890576U - Axial seal structure for single-stage centrifugal pump

Info

Publication number: CN215890576U
Application number: CN202122173072.4U
Authority: CN
Inventors: 徐秀生; 陈修藤
Original assignee: Shanghai Liancheng Group Dalian Chemical Pump Manufacturing Co ltd
Current assignee: Shanghai Liancheng Group Dalian Chemical Pump Manufacturing Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-02-22
Anticipated expiration: 2031-09-09

Abstract

The utility model discloses an axial sealing structure for a single-stage centrifugal pump, which relates to the technical field of centrifugal pump shaft sealing and comprises a rotating shaft and a positioning cylinder, wherein a movable ring sleeve is fixedly connected onto the rotating shaft, a fixed ring sleeve is arranged in the positioning cylinder, a first limiting ring is fixedly connected onto the outer wall surface of the fixed ring sleeve, the outer wall surface of the first limiting ring is contacted with the inner wall surface of the positioning cylinder, a pair of first sealing rings with the same structure and opposite directions are arranged on the upper side and the lower side of the first limiting ring, the inner wall surface and the outer wall surface of the first sealing ring are respectively contacted with the inner wall surface of the positioning cylinder and the outer wall surface of the fixed ring sleeve, a pair of second limiting rings are fixedly connected onto the upper side and the lower side of the pair of first sealing rings on the outer wall surface of the fixed ring sleeve, a plurality of isolating rings are fixedly connected onto the inner wall surface of the fixed ring sleeve, a plurality of inserting grooves are formed on the outer wall surface of the movable ring sleeve, and the isolating rings on the fixed ring sleeve can be tightly attached to the lower wall surface of the inserting grooves through the thrust of a spring, the axial displacement of the rotating shaft can be realized while the sealing performance is ensured.

Description

Axial seal structure for single-stage centrifugal pump

Technical Field

The utility model relates to the technical field of centrifugal pump shaft sealing, in particular to an axial sealing structure for a single-stage centrifugal pump.

Background

In various pumps for conveying media, because a pump shell and a pump shaft rotate relatively, a certain gap exists between the pump shell and the pump shaft, and in order to prevent the conveyed media from leaking outwards along the gap, a sealing structure is generally arranged in various pumps, for example, in the utility model patent with the publication number of CN203585332U, a sewage pump sealing device is disclosed, which comprises a pump shaft, a static ring seat, a dynamic ring seat, a positioning seat and a spring seat sleeved on the pump shaft, wherein the dynamic ring seat is arranged below the spring seat, the static ring seat is arranged below the dynamic ring seat, the positioning seat is sleeved outside the pump shaft and is arranged below the dynamic ring seat, the spring seat is fixedly connected with the pump shaft through a fastening screw, and the positioning seat and the static ring seat are hermetically connected through a static ring seat sealing ring; the spring seat is connected with the pump shaft in a sealing way through a pump shaft sealing ring; the spring seat is connected with the movable ring seat in a sealing mode through a movable ring seat sealing ring. The utility model discloses a can reduce the wearing and tearing of contact surface between parts such as rotating ring, quiet ring and pump shaft, improve sealing device's sealing performance, extension sealing device's life, however, when leading to the pivot to take place axial displacement because of vibrations, the device can't cushion the axial force that produces, easily causes the damage to sealing device, reduces life, and the result of use is not good.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides an axial sealing structure for a single-stage centrifugal pump, which solves the technical problem that the existing device cannot buffer the generated axial force.

In order to achieve the purpose, the utility model is realized by the following technical scheme: an axial sealing structure for a single-stage centrifugal pump comprises a rotating shaft and a positioning cylinder, wherein a movable ring sleeve is fixedly connected to the rotating shaft, a fixed ring sleeve is arranged in the positioning cylinder, a first limiting ring is fixedly connected to the outer wall surface of the fixed ring sleeve, the outer wall surface of the first limiting ring is in contact with the inner wall surface of the positioning cylinder, a pair of first sealing rings with the same structure and opposite directions are arranged on the upper side and the lower side of the first limiting ring, the inner wall surface and the outer wall surface of the first sealing ring are in contact with the inner wall surface of the positioning cylinder and the outer wall surface of the fixed ring sleeve respectively, a pair of second limiting rings are fixedly connected to the outer wall surface of the fixed ring sleeve and positioned on the upper side and the lower side of the first sealing ring respectively, a plurality of isolating rings are fixedly connected to the inner wall surface of the fixed ring sleeve, a plurality of inserting grooves are formed in the outer wall surface of the movable ring sleeve, a plurality of isolating rings are arranged in the inserting grooves respectively, and mounting grooves are formed in the lower wall surfaces of the isolating rings, a second sealing ring is installed in the installation groove, and a pushing limiting structure is communicated with the upper portion of the fixed ring sleeve.

Preferably, promote limit structure including offering in a plurality of spacing grooves of wall are sheathe in to the fixed ring, just be located in the position tube fixed ring cover top swing joint has the push ring, the wall rigid coupling has a plurality of gag lever posts under the push ring, and is a plurality of gag lever post cartridge is in a plurality of the spacing inslot, the position tube internal face just is located the thread groove has been seted up to the push ring top, the thread groove internal rotation has connect the thread bush, the thread bush lower extreme with the wall contacts on the push ring, the push ring with be equipped with circumference limit structure between the position tube.

Preferably, the circumferential limiting structure comprises a plurality of key grooves formed in the circumferential wall surface of the push ring, a plurality of positioning keys are fixedly connected to the inner wall surface of the positioning cylinder and located below the thread grooves, and the plurality of positioning keys are matched with the plurality of key grooves.

Preferably, the outer side of the upper end of the threaded sleeve is provided with a hexagonal ring, and the hexagonal ring and the threaded sleeve are integrally formed.

Preferably, the first sealing ring is U-shaped in cross section.

Preferably, the cross section of the second sealing ring is O-shaped.

Preferably, the outer wall surface of the lower end of the positioning cylinder is fixedly connected with a mounting seat.

Advantageous effects

The utility model provides an axial sealing structure for a single-stage centrifugal pump, which has the following beneficial effects that when a rotating shaft axially displaces, a movable ring sleeve drives a fixed ring sleeve to move up and down, a separation ring on the fixed ring sleeve can be tightly attached to the lower wall surface of an insertion groove through the thrust of a spring, the axial displacement of the rotating shaft can be realized while the sealing performance is ensured, the sealing device is prevented from being damaged due to the axial displacement of the rotating shaft, the service life is prolonged, a hexagonal ring can be rotated by a spanner to enable a threaded sleeve to move up and down in a positioning way, the pressure of the spring can be changed by pushing the push ring through the threaded sleeve, and the fixed ring sleeve and a positioning cylinder can be sealed through a pair of first sealing rings in opposite directions.

Drawings

Fig. 1 is a front view of the internal structure of the present invention.

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

Fig. 3 is a top view of the push ring of the present invention.

FIG. 4 is a top view of the hexagonal ring of the present invention.

In the figure: 1-a rotating shaft; 2-a positioning cylinder; 3-a movable ring sleeve; 4-fixed ring sleeve; 5-a first stop collar; 6-a spacer ring; 7-mounting grooves; 8-a second sealing ring; 9-inserting grooves; 10-a first sealing ring; 11-a second stop collar; 12-a push ring; 13-thread groove; 14-a threaded sleeve; 15-hexagonal ring; 16-a positioning key; 17-a limit groove; 18-a stop lever; 19-a spring; 20-mounting seat.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: an axial sealing structure for a single-stage centrifugal pump comprises a rotating shaft 1 and a positioning cylinder 2, wherein a movable ring sleeve 3 is fixedly connected to the rotating shaft 1, a fixed ring sleeve 4 is arranged in the positioning cylinder 2, a first limiting ring 5 is fixedly connected to the outer wall surface of the fixed ring sleeve 4, the outer wall surface of the first limiting ring 5 is in contact with the inner wall surface of the positioning cylinder 2, a pair of first sealing rings 10 with the same structure and the opposite directions are arranged on the upper side and the lower side of the first limiting ring 5, the inner wall surface and the outer wall surface of the first sealing ring 10 are respectively in contact with the inner wall surface of the positioning cylinder 2 and the outer wall surface of the fixed ring sleeve 4, a pair of second limiting rings 11 are fixedly connected to the outer wall surface of the fixed ring sleeve 4 and positioned on the upper side and the lower side of the first sealing ring 10, a plurality of isolating rings 6 are fixedly connected to the inner wall surface of the fixed ring sleeve 4, a plurality of inserting grooves 9 are arranged on the outer wall surface of the movable ring sleeve 3, and a plurality of isolating rings 6 are respectively arranged in the inserting grooves 9, mounting grooves 7 are formed in the lower wall surfaces of the isolating rings 6, second sealing rings 8 are mounted in the mounting grooves 7, and pushing limiting structures are communicated with the upper portions of the fixed ring sleeves 4; the pushing limiting structure comprises a plurality of limiting grooves 17 formed in the upper wall surface of the fixed ring sleeve 4, a push ring 12 is movably connected in the positioning cylinder 2 and positioned above the fixed ring sleeve 4, a plurality of limiting rods 18 are fixedly connected to the lower wall surface of the push ring 12, the limiting rods 18 are inserted in the limiting grooves 17, a thread groove 13 is formed in the inner wall surface of the positioning cylinder 2 and positioned above the push ring 12, a thread sleeve 14 is screwed in the thread groove 13, the lower end of the thread sleeve 14 is in contact with the upper wall surface of the push ring 12, and a circumferential limiting structure is arranged between the push ring 12 and the positioning cylinder 2; the circumferential limiting structure comprises a plurality of key grooves formed in the circumferential wall surface of the push ring 12, a plurality of positioning keys 16 are fixedly connected to the inner wall surface of the positioning cylinder 2 and below the thread groove 13, and the positioning keys 16 are matched with the key grooves; the outer side of the upper end of the threaded sleeve 14 is provided with a hexagonal ring 15, and the hexagonal ring 15 and the threaded sleeve 14 are integrally formed; the section of the first sealing ring 10 is U-shaped; the section of the second sealing ring 8 is O-shaped; the outer wall surface of the lower end of the positioning cylinder 2 is fixedly connected with a mounting seat 20.

Example (b): as can be known from the attached figures 1-4 of the specification, when in use, the thread bushing 14 can move up and down in the positioning cylinder 2 by rotating the hexagonal ring 15 by using a wrench, the push ring 12 can be prevented from rotating by the positioning key 16 arranged, the fixed ring bushing 4 can be prevented from rotating by inserting the limiting rod 18 into the limiting groove 17, the pressure of the spring 19 can be changed by pushing the push ring 12 by the thread bushing 14, the movable ring bushing 3 drives the fixed ring bushing 4 to move up and down when the rotating shaft 1 is axially displaced, the isolating ring 6 on the fixed ring bushing 4 can be attached to the lower wall surface of the inserting groove 9 by the thrust of the spring 19, the sealing performance is ensured, and the fixed ring bushing 4 and the positioning cylinder 2 can be sealed by a pair of first sealing rings 10 in opposite directions.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Claims

1. The utility model provides an axial seal structure for single-stage centrifugal pump, includes pivot (1) and a location section of thick bamboo (2), its characterized in that, the rigid coupling has movable ring cover (3) on pivot (1), be equipped with fixed ring cover (4) in a location section of thick bamboo (2), the rigid coupling has first spacing ring (5) on the outer wall of fixed ring cover (4), first spacing ring (5) outer wall with the internal face of a location section of thick bamboo (2) contacts, a pair of first sealing washer (10) that the same direction of structure is opposite is installed to both sides about first spacing ring (5), first sealing washer (10) inside and outside wall respectively with the internal face of a location section of thick bamboo (2) and the outer wall of fixed ring cover (4) contacts, fixed ring cover (4) outer wall just is located a pair of the rigid coupling of both sides has a pair of second spacing ring (11) about first sealing washer (10), fixed ring cover (4) internal face has a plurality of spacing rings (6), a plurality of inserting grooves (9) are formed in the outer wall surface of the movable ring sleeve (3), the isolating rings (6) are arranged in the inserting grooves (9) respectively, a plurality of installing grooves (7) are formed in the lower wall surface of the isolating rings (6), second sealing rings (8) are installed in the installing grooves (7), and a pushing limiting structure is communicated with the upper portion of the fixed ring sleeve (4).

2. The axial sealing structure for the single-stage centrifugal pump according to claim 1, wherein the pushing limiting structure comprises a plurality of limiting grooves (17) formed in an upper wall surface of the fixed ring sleeve (4), a push ring (12) is movably connected to the inside of the positioning sleeve (2) and located above the fixed ring sleeve (4), a plurality of limiting rods (18) are fixedly connected to the lower wall surface of the push ring (12), the limiting rods (18) are inserted into the limiting grooves (17), a thread groove (13) is formed in the inner wall surface of the positioning sleeve (2) and located above the push ring (12), a thread sleeve (14) is screwed into the thread groove (13), the lower end of the thread sleeve (14) is in contact with the upper wall surface of the push ring (12), and a circumferential limiting structure is arranged between the push ring (12) and the positioning sleeve (2).

3. The axial seal structure for the single-stage centrifugal pump according to claim 2, wherein the circumferential limiting structure comprises a plurality of key grooves formed in the circumferential wall surface of the push ring (12), a plurality of positioning keys (16) are fixedly connected to the inner wall surface of the positioning cylinder (2) and located below the thread groove (13), and the plurality of positioning keys (16) are matched with the plurality of key grooves.

4. An axial sealing structure for a single-stage centrifugal pump according to claim 2, characterized in that the thread bushing (14) is provided with a hexagonal ring (15) at the upper end outside, and the hexagonal ring (15) is integrally formed with the thread bushing (14).

5. Axial seal for a single-stage centrifugal pump according to claim 1, characterized in that the first sealing ring (10) is U-shaped in cross-section.

6. An axial sealing structure for a single-stage centrifugal pump according to claim 1, characterized in that the second sealing ring (8) is O-shaped in cross section.

7. The axial sealing structure for the single-stage centrifugal pump according to claim 1, wherein the outer wall surface of the lower end of the positioning cylinder (2) is fixedly connected with a mounting seat (20).