CN106989051B

CN106989051B - Sealing mouth ring for centrifugal pump

Info

Publication number: CN106989051B
Application number: CN201710355569.3A
Authority: CN
Inventors: 柴立平; 燕浩; 李跃; 潘耀东; 石海峡; 李强; 俞嘉枫
Original assignee: Anhui Nanfang Chemical Pump Industry Co ltd; Hefei University of Technology
Current assignee: Anhui Nanfang Chemical Pump Industry Co ltd; Hefei University of Technology
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2023-05-12
Anticipated expiration: 2037-05-19
Also published as: CN106989051A

Abstract

The invention belongs to the field of centrifugal pumps, and particularly relates to a sealing mouth ring for a centrifugal pump, wherein a buckle is arranged on the sealing mouth ring, and a channel matched with the buckle is arranged in a pump body of the centrifugal pump. Through set up buckle and installation boss on sealed mouth ring, put into the pump body with sealed mouth ring during the installation, after buckle and the indentation of channel entry alignment, shift into the channel internal fixation with the buckle with the help of installation boss, this kind of design can effectually reduce high-pressure liquid flow direction low pressure liquid and cause revealing and energy loss, the buckle design has avoided the use of screw, not only save material but also installation and dismantlement are convenient, the existence of buckle has effectively prevented friction loss, increase life.

Description

Sealing mouth ring for centrifugal pump

Technical Field

The invention belongs to the field of centrifugal pumps, and particularly relates to a sealing mouth ring for a centrifugal pump.

Background

When the centrifugal pump works, the impeller rotates at a high speed, and the pump body is a fixed part, so that a certain gap is reserved between the impeller and the pump body, and the pressure difference at two ends of the gap causes leakage and energy loss caused by the flow of high-pressure liquid to low-pressure liquid. In order to reduce the leakage amount, a sealing piece is arranged at the clearance, so that leakage and energy loss are reduced, the sealing effect is achieved, abrasion between the water pump impeller and the pump shell is prevented, the water flow state at the water pump inlet is improved, and the water pump efficiency is improved.

The existing centrifugal pump impeller collar is mostly sealed by adopting a straight collar, and the sealing effect is achieved by means of throttling gaps. Although this structure has the function of preventing the backflow of the high-pressure liquid to the low-pressure liquid, the backflow preventing function is limited; partial fluid is mixed with inlet inflow through backflow to cause volume loss, the daily cumulative and monthly cumulative ring is severely worn, frequent replacement is needed, and unnecessary waste of resources and energy sources is caused; the mouth ring is generally fixed on the pump body and the impeller by screws, and the installation mode requires a certain screw and is inconvenient to install and maintain; the general effect of the ring in sealing and wear-resisting only does not help balance the axial forces.

Disclosure of Invention

In order to solve the problems, the invention provides the sealing mouth ring which reduces leakage and volume loss, has a simple structure and is convenient to manufacture and install.

The invention provides the following technical scheme:

a seal mouth ring for centrifugal pump is equipped with the buckle on the seal mouth ring, be equipped with in the centrifugal pump body with buckle matched with channel.

Preferably, the sealing ring is further provided with a mounting boss which is convenient for rotating the sealing ring, so that a buckle on the sealing ring is fixed in the channel.

Preferably, the mounting boss is disposed radially outside the seal ring, and the mounting boss, the impeller suction inlet and the seal ring form a bent and rotated channel.

Preferably, the sealing collar comprises a fixing part and a mounting part, and the buckle is positioned on the mounting part and inclines towards the direction of the impeller.

Preferably, the machining direction of the channel is consistent with the rotation direction of the centrifugal pump impeller.

Preferably, a labyrinth seal is arranged in a sealing gap formed between the sealing mouth ring fixing part and the inner side of the suction inlet of the impeller of the centrifugal pump.

Preferably, a sealing ring for preventing the sealing ring from moving axially is arranged at the interface of the sealing ring and the centrifugal pump body.

The beneficial effects of the invention are as follows:

1. through setting up buckle and installation boss on sealing ring, put into the pump body with sealing ring during the installation, after buckle and the indentation of channel entry alignment, shift into the channel internal fixation with the aid of installation boss with the buckle, this kind of design can effectually reduce high-pressure liquid flow direction low pressure liquid and cause revealing and energy loss, buckle design has avoided the use of screw, not only save material but also installation and dismantlement are convenient, the existence of buckle has effectively prevented friction loss, increase life;

2. the machining direction of the channel is consistent with the rotation of the impeller, the impeller rotates to drive the sealing ring to move relatively, the moving direction of the sealing ring is the same as that of the impeller relative to the pump body, and the clamping buckle is clamped in the channel during movement, so that the freedom degree in the circumferential direction is limited, and the sealing ring is firmly fixed and does not generate relative movement with the pump body;

3. by adopting the labyrinth seal, the energy of the high-pressure liquid is reduced due to the loss of the along-path and local resistance when the high-pressure liquid passes through the labyrinth seal, the pressure is reduced, and compared with the direct seal, the reflux quantity is less;

4. the sealing gap is positioned at the inner side of the suction inlet of the impeller of the centrifugal pump, and compared with a common straight-mouth ring, the sealing gap can partially enlarge the pressure receiving area of the front cover plate of the centrifugal pump, and has a certain effect on the balance of axial force;

5. the sealing ring design prevents axial movement of the sealing collar and prevents backflow of liquid from the small gap present at the interface of the sealing collar and the centrifugal pump body.

Drawings

FIG. 1 is a schematic structural view of a centrifugal pump;

FIG. 2 is a schematic structural view of a seal ring;

FIG. 3 is another embodiment of FIG. 2;

FIG. 4 is a cross-sectional view A-A of FIG. 1;

FIG. 5 is a B-B cross-sectional view of FIG. 4;

fig. 6 is a cross-sectional view of the sealing ring.

The meaning of the symbols in the drawings is as follows:

10-centrifugal pump 11-channel 111-channel inlet 12-impeller 20-sealing ring 21-snap-in 22-mounting boss 23-fixing part 24-mounting part 25-sealing gap 30-sealing ring

Detailed Description

The present invention will be specifically described with reference to the following examples.

As shown in fig. 1-6, a sealing ring 20 for a centrifugal pump 10 is provided, a buckle 21 is arranged on the sealing ring 20, and a groove 11 matched with the buckle is arranged in a pump body of the centrifugal pump 10. The sealing ring 20 is also provided with a mounting boss 22 which facilitates the rotation of the sealing ring 20, and the fastening 21 on the sealing ring 20 is fixed in the channel 11. The width b, the depth h, the width b and the depth h of the buckle 21 can be processed correspondingly according to the actual size of the pump body of the centrifugal pump 10 by a person skilled in the art, the channel 11 is required to be processed according to the width b and the depth h of the buckle, the processing angle beta can be adjusted according to the actual situation, the channel 11 is generally within 90 degrees, the effect of fixing the sealing ring 20 is achieved, the angle alpha of the mounting boss 22 is 15 degrees to 30 degrees, and the main function of the mounting boss 22 is to facilitate the mounting and dismounting of the sealing ring 20. Through setting up buckle 21 and installation boss 22 on sealed mouth ring 20, put into centrifugal pump 10 pump body with sealed mouth ring 20 during the installation, buckle 21 aligns the back of impressing with channel entry 111, shift into buckle 21 with the help of installation boss 22 and be fixed in channel 11, this kind of design can effectually reduce high-pressure liquid flow direction low pressure liquid and cause revealing and energy loss, buckle 21 design has avoided the use of screw, save material and installation and dismantlement convenience moreover, the existence of buckle 21 has effectively prevented friction loss, increase life.

Further to the above embodiment, the mounting boss 22 is disposed radially outside the seal ring 20, and the mounting boss 22, the suction inlet of the impeller 12, and the seal ring 20 form a bent and rotated passage.

The seal ring 20 includes a fixing portion 23 and a mounting portion 24, and the snap 21 is located on the mounting portion 24 and is inclined toward the impeller 12. When the sealing ring 20 is placed into the pump body of the centrifugal pump 10 during installation, after the clamping buckle 21 is aligned with the inlet of the channel 11 and pressed in, the clamping buckle 21 is rotated into the channel 11 to be fixed by the aid of the installation boss 22, the clamping buckle 21 in a vertical state can generate a rebound force, and the rebound force is transmitted to the fixing part 23 through the installation part 24, so that the fixing part 23 is subjected to a force towards the sealing gap 25, and the sealing is tighter.

Further optimizing the above embodiment, the machining direction of the channel 11 is consistent with the rotation direction of the impeller 12 of the centrifugal pump 10, the impeller 12 rotates to drive the sealing ring 20 to move relatively, the moving direction is the same as that of the impeller 12 relative to the pump body, and the freedom degree in the circumferential direction is limited because the buckle 21 is clamped in the channel during the movement, so that the sealing ring 20 is firmly fixed and does not generate relative movement with the pump body.

Further optimizing the above embodiment, the labyrinth seal is provided in the sealing gap formed between the fixing portion 23 of the sealing ring 20 and the inside of the suction port of the impeller 12 of the centrifugal pump 10. Compared with a common straight-mouth ring, the pressure receiving area of the front cover plate of the centrifugal pump 10 is increased by a part, and the axial force balance is realized to a certain extent; by adopting the labyrinth seal, the energy of the high-pressure liquid is reduced due to the loss of the along-path and local resistance when the high-pressure liquid passes through the labyrinth seal, the pressure is reduced, and compared with the direct seal, the reflux quantity is less.

Further optimizing the above embodiment, as shown in fig. 1, a seal ring 30 for preventing the seal ring 20 from moving axially is provided at the interface between the seal ring 20 and the pump body of the centrifugal pump 10, and the seal ring 30 is designed to prevent the seal ring 20 from moving axially and to prevent the backflow of liquid due to the small gap existing at the interface between the seal ring 20 and the pump body of the centrifugal pump 10.

The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The sealing mouth ring for the centrifugal pump is characterized in that a buckle (21) is arranged on the sealing mouth ring (20), and a groove (11) matched with the buckle (21) is arranged in a pump body of the centrifugal pump (10);

the sealing mouth ring (20) is also provided with a mounting boss (22) which is convenient for rotating the sealing mouth ring (20) to fix a buckle (21) on the sealing mouth ring (20) in the channel (11);

the mounting boss (22) is arranged on the radial outer side of the sealing ring (20), and the mounting boss (22), the suction inlet of the impeller (12) and the sealing ring (20) form a bent and rotary channel;

the sealing ring (20) comprises a fixing part (23) and a mounting part (24), and the buckle (21) is positioned on the mounting part (24) and inclines towards the direction of the impeller (12).

2. A sealing collar for a centrifugal pump according to claim 1, characterized in that the machining direction of the channel (11) coincides with the direction of rotation of the impeller (12) of the centrifugal pump (10).

3. A sealing collar for a centrifugal pump according to claim 2, characterized in that a labyrinth seal is provided in a sealing gap (25) formed between the fixing portion (23) of the sealing collar (20) and the inside of the suction inlet of the impeller (12) of the centrifugal pump (10).

4. A sealing collar for a centrifugal pump according to any one of claims 1-3, characterized in that a sealing ring (30) preventing axial movement of the sealing collar (20) is provided at the interface of the sealing collar (20) and the pump body of the centrifugal pump (10).