CN106968983B

CN106968983B - Easy-to-install collar for reducing leakage

Info

Publication number: CN106968983B
Application number: CN201710355574.4A
Authority: CN
Inventors: 燕浩; 柴立平; 李跃; 潘耀东; 石海峡; 李强; 黄鑫; 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: 2023-10-13
Anticipated expiration: 2037-05-19
Also published as: CN106968983A

Abstract

The invention belongs to the field of centrifugal pumps, and particularly relates to an easy-to-install collar for reducing leakage, wherein an elastic buckle is arranged on the collar, a clamping groove matched with the elastic buckle is arranged on a pump body of a centrifugal pump, and the elastic buckle and the clamping groove form interference connection. The beneficial effects of the invention are as follows: 1. the elastic buckle is arranged on the mouth ring, the clamping groove matched with the elastic buckle is arranged on the centrifugal pump body, and the mouth ring can achieve the effect of fixing the mouth ring by means of interference connection between the elastic buckle and the clamping groove and elastic deformation of the elastic buckle without using screws; 2. the elastic buckle is arranged on the mouth ring, so that the axial movement of the mouth ring can be prevented, and the locating boss is arranged on the mouth ring, so that the circumferential movement of the mouth ring can be prevented.

Description

Easy-to-install collar for reducing leakage

Technical Field

The invention belongs to the field of centrifugal pumps, and particularly relates to an easy-to-install collar for reducing leakage.

Background

The mouthpiece, also called sealing ring, is typically found on centrifugal pumps. The split ring is divided into a front split ring (located at the impeller suction inlet) and a rear split ring (located at the impeller back). The front opening ring separates a high-pressure area from a low-pressure area in the pump, prevents liquid from flowing from the high-pressure area to the low-pressure area in a large quantity, namely prevents high-pressure fluid from flowing from the front cavity of the impeller to the suction inlet of the impeller, and plays a role in sealing. Meanwhile, the mouth ring also plays a role in wear resistance, and damage to the impeller and the pump shell is avoided. Most centrifugal pumps have a pump body collar.

For a typical centrifugal pump, the collar, which is now commonly used, is typically screwed to the pump body and impeller. The installation mode needs a certain number of screws, and the installation and the maintenance are complex; the mouth ring is positioned between the pump body and the suction inlet of the impeller, and a straight gap between the mouth ring and the suction inlet of the impeller is used for generating flow resistance, so that the effect of preventing backflow is achieved. However, this structure does not completely prevent backflow, and it can be found in real production that some fluid enters the impeller suction port through the gap, disturbs the main flow, and causes a volume loss; in addition, the general structure of the ring only has the functions of sealing and wear resistance, is positioned outside the suction inlet of the impeller, and has no effect on the balance of axial force, so that the axial force can be balanced only by other structures.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a mouth ring for a centrifugal pump, which does not need screw fixation and is convenient to install and maintain.

The invention provides the following technical scheme:

an easy-to-install collar for reducing leakage is provided with an elastic buckle, the centrifugal pump body is provided with a clamping groove matched with the elastic buckle, and the elastic buckle and the clamping groove form interference connection.

Preferably, the length from the inner wall of the mouth ring to the top of the elastic buckle is H, the length from the inner wall of the mouth ring to the root of the elastic buckle is H, and the H is 50% -80% of H.

Preferably, the section of the elastic buckle is hook-shaped.

Preferably, the number of the elastic buckles is 2-6.

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

Preferably, the angle of inclination is 2-8 degrees.

Preferably, the mouth ring is also provided with a positioning boss, and the centrifugal pump body is provided with a positioning groove matched with the positioning boss.

Preferably, the number of the positioning bosses is 1.

Preferably, the mouth ring adopts labyrinth seal or spiral seal.

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

The beneficial effects of the invention are as follows:

1. the elastic buckle is arranged on the mouth ring, the clamping groove matched with the elastic buckle is arranged on the centrifugal pump body, and the mouth ring can achieve the effect of fixing the mouth ring by means of interference connection between the elastic buckle and the clamping groove and elastic deformation of the elastic buckle without using screws;

2. the elastic buckle is arranged on the mouth ring, so that the axial movement of the mouth ring can be prevented, and the positioning boss is arranged on the mouth ring, so that the circumferential movement of the mouth ring can be prevented;

3. 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 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;

4. the labyrinth seal or spiral seal is arranged in the seal gap, and the resistance of the gap formed by the seal is larger than that of the straight gap, so that the reflux quantity is smaller; if the spiral seal is adopted, a pumping effect can be generated, so that sealing liquid at the gap is boosted, and the pressure drop of the sealed liquid is balanced, thereby preventing backflow and achieving a better sealing effect; the sealing gap formed by the mouth ring is at the inner side of the impeller suction inlet, so that the pressure receiving area of the front cover plate is increased by a part, and the mouth ring plays a certain role in balancing axial force.

Drawings

FIG. 1 is a schematic diagram of a centrifugal pump;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is a cross-sectional view of an oral ring;

FIG. 4 is a schematic diagram of a card slot in a centrifugal pump;

fig. 5 is a side view of the oral ring.

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

10-centrifugal pump 11-clamping groove 12-impeller 20-mouth ring 21-elastic buckle 22-positioning boss 23-fixing part 24-mounting part 25-sealing gap

Detailed Description

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

As shown in fig. 1, 2, 3 and 4, an easy-to-mount orifice ring for reducing leakage is provided, an elastic buckle 21 is provided on the orifice ring 20, a clamping groove 11 matched with the elastic buckle 21 is provided on the pump body of the centrifugal pump 10, the elastic buckle 21 and the clamping groove 11 form interference connection, and the diameter of the clamping groove 11 is 0.1-1mm smaller than that of the orifice ring 20. The collar 20 can achieve the effect of fixing the collar 20 by means of the interference connection of the elastic buckle 21 and the clamping groove 11 and the elastic deformation of the elastic buckle 21 without using a screw;

further optimizing the above embodiment, the length from the inner wall of the collar 20 to the top of the elastic buckle is H, the length from the inner wall of the collar 20 to the root of the elastic buckle is H, H is 50% -80% of H, the strength requirement of the collar 20 can be ensured, the section of the collar 20 is hooked, the connection can be more compact due to the hooked shape, the number of the elastic buckles 21 is 2-6, and the axial movement of the collar 20 is prevented.

Further optimizing above-mentioned embodiment, the mouth ring 20 and the elastic buckle 21 are as an organic whole, the mouth ring 20 includes fixed part 23 and installation department 24, the elastic buckle 21 is located on the installation department 24 and inclines towards impeller 12 direction, the angle of preferred slope is 2-8 degrees, during the installation, with the elastic buckle 21 on the mouth ring 20 support on draw-in groove 11, a hard pressure, can install the mouth ring 20 in draw-in groove 11, after the installation, elastic buckle 21 is vertical and firmly cooperates with draw-in groove 11, elastic buckle 21 in vertical state can produce the resilience force, the resilience force is passed through installation department 24 and is given fixed part 23 for fixed part 23 receives towards sealing gap 25's power, thereby the seal is inseparabler.

Further optimizing the above embodiment, as shown in fig. 5, the collar 20 is further provided with positioning bosses 22, and the pump body of the centrifugal pump 10 is provided with positioning slots (not shown) matched with the positioning bosses 22, so that circumferential movement of the collar 20 can be effectively prevented, and preferably, the number of the positioning bosses is 1.

Further optimizing the above embodiment, the sealing gap 25 formed between the fixed part 23 of the collar 20 and the inner side of the suction inlet of the impeller 12 of the centrifugal pump 10 is provided with a labyrinth seal or a spiral seal. When the labyrinth seal is adopted, the surface of the fixing part 23 facing the sealing gap 25 is in a zigzag shape, and the resistance of the gap formed by the labyrinth seal or the spiral seal is larger than that of the straight gap, so that the reflux amount is smaller; if the spiral seal is adopted, a pumping effect can be generated, so that sealing liquid at the gap is boosted, and the pressure drop of the sealed liquid is balanced, thereby preventing backflow and achieving a better sealing effect; the sealing gap formed by the mouth ring is at the inner side of the impeller suction inlet, so that the pressure receiving area of the front cover plate is increased by a part, and the mouth ring plays a certain role in balancing axial force.

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. An easy-to-install collar for reducing leakage is characterized in that an elastic buckle (21) is arranged on the collar (20), a clamping groove (11) matched with the elastic buckle (21) is arranged on a pump body of a centrifugal pump (10), and the elastic buckle (21) and the clamping groove (11) form interference connection;

the length from the inner wall of the mouth ring (20) to the top of the elastic buckle is H, the length from the inner wall of the mouth ring (20) to the root of the elastic buckle is H, and the H is 50% -80% of H; the section of the elastic buckle (21) is in a hook shape; the number of the elastic buckles (21) is 2-6; the mouth ring (20) and the elastic buckle (21) are integrated, the mouth ring (20) comprises a fixing part (23) and a mounting part (24), and the elastic buckle (21) is positioned on the mounting part (24) and inclines towards the direction of the impeller (12).

2. An easy-to-install collar for reducing leakage according to claim 1, wherein the angle of inclination is 2-8 degrees.

3. An easy-to-mount collar for reducing leakage according to claim 2, wherein said collar (20) further comprises a positioning boss (22), and said centrifugal pump (10) body comprises a positioning groove for engaging said positioning boss (22).

4. A collar for reducing leakage according to claim 3, characterized in that said positioning bosses (22) are 1.

5. An easy-to-mount collar for reducing leakage according to claim 4, wherein a labyrinth seal or a screw seal is provided in a seal gap (25) formed between said collar (20) fixing portion (23) and the inside of the suction port of the impeller (12) of the centrifugal pump (10).