CN110552889B

CN110552889B - Leakage-free centrifugal pump

Info

Publication number: CN110552889B
Application number: CN201910973363.6A
Authority: CN
Inventors: 蒋友锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-11-06
Anticipated expiration: 2039-10-14
Also published as: CN110552889A

Abstract

The invention discloses a leakage-free centrifugal pump, which comprises a pump body, wherein an end cover is fixed at the bottom of the pump body through a bolt, an inner flow cavity is formed in the end cover, an impeller is rotatably connected in the inner flow cavity, the center of the top of the impeller is connected with the output end of the pump body through an impeller shaft, a sealing assembly is arranged between the impeller shaft and the inner wall of the end cover and comprises a sealing ring, a positioning groove and a sealing seat, the sealing seat is integrally formed in the end cover and positioned at the periphery of the impeller shaft, a shaft sleeve connected with one end of the sealing seat is fixedly sleeved on the impeller shaft, and an air chamber is formed between the inner wall of the sealing seat and the shaft sleeve. The invention has novel structure and ingenious conception, the sealing ring is not in direct contact with working media, the property of the media does not directly act on the operation of the sealing ring, the sealing performance is good, the media can be effectively prevented from leaking, and the service life of the centrifugal pump is effectively prolonged.

Description

Leakage-free centrifugal pump

Technical Field

The invention relates to the technical field of centrifugal pumps, in particular to a leakage-free centrifugal pump.

Background

Centrifugal pumps are widely used in the industries of mechanical manufacture, environmental protection, chemical industry, smelting, pharmacy, agriculture and the like, and generally divided into clear water centrifugal pumps and chemical centrifugal pumps according to the requirements of used media. The centrifugal pump is composed of main parts such as a pump frame, a pump body, a pump cover, an impeller and a seal.

The main parts are sealed by oil seal (filler) and mechanical seal. The oil seal (packing) seal is realized by the matching rotation of the oil seal cutting edge and the shaft sleeve excircle. The mechanical seal seals the medium by the relative rotation of the sealing surfaces of the moving and static rings. In the actual use process, the change of temperature and temperature, the height and the change of pressure, the corrosivity of materials, the amount of particles, the thickness, the property and the change of materials, the change of the materials along with the change of temperature and pressure and the like influence the sealing effect and the service life. The sealing structure aims at solving the problems of running, overflowing, dripping and leaking in the actual production process of the existing sealing structure. Therefore, it is necessary to design a centrifugal pump without leakage.

Disclosure of Invention

In view of the above circumstances, in order to overcome the defects of the prior art, the invention provides a leakage-free centrifugal pump which has a novel structure and an ingenious conception, wherein a sealing ring is not in direct contact with a working medium, the property of the medium does not directly act on the operation of the sealing ring, the sealing performance is good, the medium leakage can be effectively prevented, the service life of the centrifugal pump is effectively prolonged, the property and the working state of the medium cannot cause the abrasion of sealing, and auxiliary media such as cooling water, sealing liquid and the like are not needed.

In order to achieve the purpose, the invention provides the following technical scheme: a leakage-free centrifugal pump comprises a pump body, wherein an end cover is fixed at the bottom of the pump body through a bolt, an inner flow cavity is formed in the end cover, an impeller is rotatably connected in the inner flow cavity, the center of the top of the impeller is connected with the output end of the pump body through an impeller shaft, and a sealing assembly is arranged between the impeller shaft and the inner wall of the end cover;

the sealing assembly comprises a sealing ring, an air chamber, a shaft sleeve, a positioning groove and a sealing seat, the sealing seat is integrally formed inside the end cover and located on the periphery of the impeller shaft, the shaft sleeve connected with one end of the sealing seat is fixedly sleeved on the impeller shaft, the air chamber is formed between the inner wall of the sealing seat and the shaft sleeve, the positioning groove is formed in one side, close to the air chamber, of the inner wall of the sealing seat, the sealing ring sleeved on the shaft sleeve is arranged inside the positioning groove, one end of the sealing ring is fixed through the positioning sleeve fixed on the sealing seat, a radial suction inlet communicated with the inner flow path cavity is formed in the position, located on the rear end face of the impeller, of one end of the end cover, and a radial discharge port communicated with the inner.

Preferably, the bottom of the end cover is fixed with a base through a bolt.

Preferably, the seal ring is a V-shaped seal ring with an opening facing the impeller, the seal ring is made of graphite filled tetrafluoroethylene material.

The invention has the beneficial effects that:

through utilizing the fashioned air chamber between the inside seal receptacle of end cover and the axle sleeve, when being higher than during operation or the highest liquid level when the feed liquor, form an air isolation room at the liquid level with sealed, the pump body is at the during operation, the pressure that the pump body operation produced or caused is passed to the inside air of air chamber earlier, the air passes to the sealing washer again, make the sealing washer not with working medium direct contact, the nature of medium does not directly play a role to the operation of sealing washer, sealing performance is good, can effectually prevent that the medium from revealing, thereby the effectual life who prolongs the centrifugal pump, and the nature and the operating condition of medium can not cause sealed wearing and tearing, and need not the cooling water, auxiliary medium such as sealing liquid.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall plan structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the end cap of the present invention;

reference numbers in the figures: 1. a pump body; 2. a seal ring; 3. an air chamber; 4. an impeller shaft; 5. a radial discharge port; 6. an inner flow cavity; 7. an impeller; 8. a base; 9. an end cap; 10. a radial suction inlet; 11. a shaft sleeve; 12. a positioning sleeve; 13. positioning a groove; 14. and (4) a sealing seat.

Detailed Description

The following describes in further detail embodiments of the present invention with reference to fig. 1-2.

As shown in fig. 1-2, the present invention provides the following technical solutions: a non-leakage centrifugal pump comprises a pump body 1, wherein an end cover 9 is fixed at the bottom of the pump body 1 through a bolt, an inner flow cavity 6 is formed in the end cover 9, an impeller 7 is rotatably connected in the inner flow cavity 6, the top center of the impeller 7 is connected with the output end of the pump body 1 through an impeller shaft 4, and a sealing assembly is arranged between the impeller shaft 4 and the inner wall of the end cover 9;

the sealing assembly comprises a sealing ring 2, an air chamber 3, a shaft sleeve 11, a positioning sleeve 12, a positioning groove 13 and a sealing seat 14, the sealing seat 14 is integrally formed inside an end cover 9 and positioned on the periphery of an impeller shaft 4, the shaft sleeve 11 connected with one end of the sealing seat 14 is fixedly sleeved on the impeller shaft 4, the air chamber 3 is formed between the inner wall of the sealing seat 14 and the shaft sleeve 11, the positioning groove 13 is formed in one side, close to the air chamber 3, of the inner wall of the sealing seat 14, the positioning groove 13 is internally provided with the sealing ring 2 sleeved on the shaft sleeve 11, one end of the sealing ring 2 is fixed through the positioning sleeve 12 fixed on the sealing seat 14, an air isolating chamber is formed between the sealing seat 14 and the shaft sleeve 11 inside the end cover 9 by utilizing the air chamber 3 formed between the sealing seat 14 and the shaft sleeve 11 when the liquid level is higher than the highest liquid level during working or liquid feeding, an air isolating chamber is, the air passes to sealing washer 2 again, make sealing washer 2 not with working medium direct contact, the nature of medium does not directly play a role to the operation of sealing washer 2, sealing performance is good, can effectually prevent that the medium from revealing, thereby the effectual life who prolongs the centrifugal pump, and the nature and the operating condition of medium can not cause sealed wearing and tearing, and need not the cooling water, auxiliary medium such as sealing liquid, the radial sunction inlet 10 with interior flow path chamber 6 intercommunication is seted up to the one end of end cover 9 position in impeller 7 rear end face department, the radial discharge port 5 with interior flow path chamber 6 intercommunication is seted up to the position department that the opposite side of end cover 9 just corresponds impeller 7.

The bottom of the end cover 9 is fixed with a base 8 through bolts.

The seal ring 2 is a V-shaped seal ring made of graphite-filled tetrafluoroethylene and having an opening facing the impeller 7.

When the centrifugal pump is used, the air chamber 3 formed between the sealing seat 14 in the end cover 9 and the shaft sleeve 11 is utilized, when the liquid level is higher than the highest liquid level in working or liquid inlet, an air isolation chamber is formed between the liquid level and the seal, when the pump body 1 works, the pressure generated or caused by the operation of the pump body 1 is firstly transmitted to the air in the air chamber 3, and then the air is transmitted to the seal ring 2, so that the seal ring 2 is not in direct contact with a working medium, the property of the medium does not directly act on the operation of the seal ring 2, the sealing performance is good, the medium leakage can be effectively prevented, the service life of the centrifugal pump is effectively prolonged, the property and the working state of the medium cannot cause seal abrasion, and auxiliary media such as cooling water, sealing liquid and the like are not needed.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A leakless centrifugal pump comprising a pump body (1), characterized in that: an end cover (9) is fixed at the bottom of the pump body (1) through a bolt, an inner process cavity (6) is formed in the end cover (9), an impeller (7) is rotatably connected to the inner portion of the inner process cavity (6), the center of the top of the impeller (7) is connected with the output end of the pump body (1) through an impeller shaft (4), and a sealing assembly is arranged between the impeller shaft (4) and the inner wall of the end cover (9);

the sealing assembly comprises a sealing ring (2), an air chamber (3), a shaft sleeve (11), a positioning sleeve (12), a positioning groove (13) and a sealing seat (14), the sealing seat (14) is integrally formed on the periphery of the impeller shaft (4) in the end cover (9), the shaft sleeve (11) connected with one end of the sealing seat (14) is fixedly sleeved on the impeller shaft (4), the air chamber (3) is formed between the inner wall of the sealing seat (14) and the shaft sleeve (11), the positioning groove (13) is formed in one side, close to the air chamber (3), of the inner wall of the sealing seat (14), the sealing ring (2) sleeved on the shaft sleeve (11) is arranged in the positioning groove (13), one end of the sealing ring (2) is fixed through the positioning sleeve (12) fixed on the sealing seat (14), a radial suction inlet (10) communicated with the inner flow path cavity (6) is formed in the position of the rear end face of the impeller (7) at one end of the end, and a radial discharge port (5) communicated with the inner flow cavity (6) is formed in the position, corresponding to the impeller (7), of the other side of the end cover (9).

2. A centrifugal pump without leakage according to claim 1, characterized in that: and a base (8) is fixed at the bottom of the end cover (9) through a bolt.

3. A centrifugal pump without leakage according to claim 1, characterized in that: the sealing ring (2) is a V-shaped sealing ring which is made of graphite filled tetrafluoroethylene and has an opening facing the impeller (7).