CN201144858Y

CN201144858Y - Novel seal ring for centrifugal pump

Info

Publication number: CN201144858Y
Application number: CNU2007201334344U
Authority: CN
Inventors: 程效锐
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2007-12-18
Filing date: 2007-12-18
Publication date: 2008-11-05
Anticipated expiration: 2017-12-18

Abstract

The utility model relates to an auxiliary device of a centrifugal pump, in particular to a novel seal ring used in a centrifugal pump. The seal ring mainly comprises an outer ring (1) and an inner ring (2), and is characterized in that: the inner ring (2) consists of a front ring (3) which is divided into two parts in the axial direction of the inner ring as well as a back ring (4); the back ring (4) is provided with a groove at an included angle less than 90 degrees to the rotation direction of an impeller. The inner ring is divided into two parts in axial direction, and the surface of the inner ring adjacent to the high pressure side of the impeller is provided with the groove which is at an included angle less than 90 degrees to the rotation direction of the impeller. When the impeller rotates, a liquid flow opposite to a leakage direction is formed, thereby reducing the speed of the liquid at a gap inlet and the cavitation damage on the seal ring caused by the liquid flow, and prolonging the service life of the seal ring; meanwhile, liquid leakage quantity is also reduced and the volumetric efficiency of a centrifugal pump is increased.

Description

A kind of New Centrifugal Pump seal ring

Technical field

The utility model relates to the auxiliary device of centrifugal pump, relates in particular to a kind of New Centrifugal Pump seal ring.

Background technique

Disclosed centrifugal pump seal ring (also claiming choma) in the prior art, its outer shroud is fixed on the housing of pump, and interior ring is fixed on the rotary blade ingress of pump, and the gap by outer shroud and interior ring seals.Because the flow at high speed of liquid stream easily causes the cavitation damage of seal ring in the gap, thereby cause the increase of seal clearance increasing and pump volumetric loss, finally make the efficient of pump reduce, more obvious for the high-lift centrifugal pump performance especially is so the life-span of seal ring is shorter.

Summary of the invention

The purpose of this utility model is to provide a kind of sealing ring for centrifugal pump at defective of the prior art, thereby has effectively overcome the problem of the described existence of background technique.

The technological scheme that its technical problem that solves the utility model adopts is: described a kind of New Centrifugal Pump seal ring, mainly include outer shroud 1 and interior ring 2, its characteristics are: in described ring 2 by axially be divided into along it two-part before ring 3 and back ring 4 forms, back ring 4 is provided with angle with the impeller sense of rotation less than 90 grooves of spending.

The utility model is compared with background technique, the useful effect that has is: described a kind of New Centrifugal Pump seal ring, ring is divided into two parts vertically in it, ring surface fluting on high-tension side near impeller, and the angle of groove of being opened and impeller sense of rotation is less than 90 degree.When impeller can form the liquid stream opposite with leaking direction when rotated, thereby reduced the liquid velocity of ingress, gap, alleviated the cavitation damage of liquid stream, prolonged the working life of seal ring seal ring, also reduce simultaneously the leakage rate of liquid, improved the volumetric efficiency of centrifugal pump.

Description of drawings

Fig. 1 is a structural representation sectional view of the present utility model;

Fig. 2 is the local enlarged diagram of the groove on the back ring 4 among Fig. 1.

In the accompanying drawing: 1. outer shroud, 2. in ring, 3. before ring, 4. back ring.

Embodiment

As shown in Figure 1, described a kind of New Centrifugal Pump seal ring, mainly include outer shroud 1 and interior ring 2, its characteristics are: in described ring 2 by axially be divided into along it two-part before ring 3 and back ring 4 forms, back ring 4 is provided with angle with the impeller sense of rotation less than 90 grooves of spending.It in force, interior ring 2 is installed in the impeller end, ring 3 is installed in front end wherein, back ring 4 is installed in the inboard, and outer shroud 1 is installed on the housing of centrifugal pump, makes impeller can form the liquid stream opposite with leaking direction when rotated, thereby reduced the liquid velocity of ingress, gap, alleviated the cavitation damage of liquid stream, prolonged the working life of seal ring, also reduced the leakage rate of liquid simultaneously seal ring.

Claims

1, a kind of New Centrifugal Pump seal ring, comprise outer shroud (1) and interior ring (2), it is characterized in that described in ring (2) by axially be divided into along it two-part before ring (3) and back ring (4) forms, the back is encircled (4) and is provided with angle with the impeller sense of rotation less than 90 grooves of spending.