CN219176567U

CN219176567U - Mechanical seal mounting structure of cantilever type liquid ring vacuum pump

Info

Publication number: CN219176567U
Application number: CN202320022174.2U
Authority: CN
Inventors: 陈首挺; 吴泰忠; 李松峰
Original assignee: Guangdong Kenflo Pump Co ltd
Current assignee: Guangdong Kenflo Pump Co ltd
Priority date: 2023-01-05
Filing date: 2023-01-05
Publication date: 2023-06-13
Anticipated expiration: 2033-01-05

Abstract

The utility model provides a mechanical seal mounting structure of a cantilever type liquid ring vacuum pump, which is characterized in that the working object of the mechanical seal mounting structure is the cantilever type liquid ring vacuum pump, and the mechanical seal mounting structure comprises a pump body, an impeller, a shaft end retainer ring, a main shaft, a shaft sleeve, a distribution plate, a mechanical seal, a side cover, a mechanical seal box body, a screw plug, a liquid inlet, a notch channel and a liquid outlet; the mechanical seal is arranged in the side cover, and two ends of the mechanical seal are closed through the distribution plate and the mechanical seal box body; or the mechanical seal is arranged on the shaft sleeve, an O-shaped sealing ring is further arranged on the shaft sleeve, one end of the impeller is sealed by the O-shaped sealing ring, and the other end of the impeller is sealed by sealing glue or a sealing gasket of the shaft end retainer ring. Compared with the mechanical seal mounting structure of the existing cantilever type liquid ring vacuum pump, the mechanical seal, the material and the flushing mode can be flexibly selected, and the sealing effect under different working conditions is effectively ensured. In addition, the main shaft is not contacted with the working solution, the material is not influenced by the components of the working solution any more, the universality of the main shaft can be effectively improved, and the production cost is reduced.

Description

Mechanical seal mounting structure of cantilever type liquid ring vacuum pump

Technical Field

The utility model belongs to the technical field of vacuum pumps, and particularly relates to a mechanical seal mounting structure of a cantilever type liquid ring vacuum pump.

Background

The existing liquid ring vacuum pump is divided into two basic types or basic structures according to the characteristics of the impeller in terms of the installation structure: one is that the impeller is arranged in the middle of the pump, and both ends of the impeller are provided with side covers and bearing supports, which is called a double-support structure; the other type is that the impeller is mounted on a specially lengthened shaft extension of the motor or a shaft extension of a special bearing bracket of the pump, such as a suspension type mounting, and is called a cantilever type structure. Liquid ring vacuum pumps having a "cantilever" configuration are also known as cantilever type liquid ring vacuum pumps. The utility model aims at a mechanical seal mounting structure of a cantilever type liquid ring vacuum pump, and the cantilever type liquid ring vacuum pump and the double-support liquid ring vacuum pump adopt corresponding seal designs.

As shown in fig. 1, a conventional mechanical seal mounting structure of a cantilever type liquid ring vacuum pump is configured such that a mechanical seal 8 is provided inside a pump body 1. The main technical defects of the mechanical seal mounting structure are as follows: in the working process, the mechanical seal 8 can be only washed and cooled through working fluid in the pump, the mechanical seal 8 is troublesome to install and fix, the structure is single, the washing mode of the mechanical seal 8 cannot be changed, and the sealing effect is relatively poor.

Disclosure of Invention

The utility model aims to improve the mechanical seal mounting structure of the existing cantilever type liquid ring vacuum pump, thereby overcoming the defects of the prior art.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the mechanical seal mounting structure of the cantilever type liquid ring vacuum pump, its working object is the cantilever type liquid ring vacuum pump, including pump body, impeller, shaft end retainer ring, main shaft, axle sleeve, distributing plate, mechanical seal, side cover, machine seal letter body, screw plug, liquid inlet, notched channel and liquid outlet; the main shaft is arranged in the pump body, a shaft end check ring, an impeller and a shaft sleeve are sequentially arranged from one end of the main shaft to the other end of the main shaft, the distributing plate is arranged at the joint of the pump body and the side cover, the screw plug is arranged on the distributing plate, the liquid inlet is arranged on the side cover, and the liquid inlet is communicated with the liquid outlet on the mechanical seal box body through a notch channel;

the mechanical seal is arranged in the side cover, and two ends of the mechanical seal are closed through the distribution plate and the mechanical seal box body;

or the mechanical seal is arranged on the shaft sleeve, an O-shaped sealing ring is further arranged on the shaft sleeve, one end of the impeller is sealed by the O-shaped sealing ring, and the other end of the impeller is sealed by the sealing glue or the sealing gasket of the shaft end retainer ring 3.

On the basis of the technical scheme, the utility model can be added with the following technical means so as to better or more pertinently solve the technical problems to be solved by the utility model:

the mechanical seal is a single-end-face mechanical seal or a double-end-face mechanical seal.

The utility model has the main beneficial effects as follows:

first, compared with the mechanical seal mounting structure of the existing cantilever type liquid ring vacuum pump, the mechanical seal (piece), the material and the flushing mode can be flexibly selected, and the sealing effect under different working conditions is effectively ensured.

Secondly, the main shaft is not contacted with the working solution, the material is not influenced by the components of the working solution any more, the universality of the main shaft can be effectively improved, and the production cost is reduced.

Thirdly, when the double-end-face mechanical seal and the single-pump-end-face mechanical seal are changed, the machine seal (inner core) can be replaced, other parts and structures are not required to be changed, and the operation is very simple.

Drawings

FIG. 1 is a schematic diagram of a mechanical seal mounting structure of a cantilever-type liquid ring vacuum pump;

FIG. 2 is a schematic view of a mounting structure employing a single-ended mechanical seal according to embodiment 1 of the present utility model;

fig. 3 is a schematic view of a mounting structure of embodiment 1 of the present utility model using a double mechanical seal.

In the figure:

1, a pump body; 2-impeller;

3-shaft end retainer ring; 4, a main shaft;

5-O-shaped seal ring; 6, a shaft sleeve;

7-a distribution plate; 8-mechanical seal;

9-side cover; 10-mechanical seal box;

11-plug screw; 12-liquid inlet;

13—a notched channel; 14-liquid discharge port.

Detailed Description

In order to facilitate a more complete understanding of the technical solutions of the present utility model by a person skilled in the art, two embodiments of the present utility model are described below in conjunction with the accompanying drawings.

Example 1

FIG. 2 is a schematic view of a mounting structure employing a single-ended mechanical seal according to embodiment 1 of the present utility model; FIG. 3 is a schematic view of a mounting structure employing a double-ended mechanical seal according to embodiment 1 of the present utility model; whether single-ended or double-ended, are generally referred to herein as mechanical seals and are generally referred to by the reference numeral 8.

As shown in fig. 2 and 3, the mechanical seal installation structure of the cantilever type liquid ring vacuum pump is characterized in that the cantilever type liquid ring vacuum pump comprises a pump body 1, an impeller 2, a shaft end retainer ring 3, a main shaft 4, an O-shaped sealing ring 5, a shaft sleeve 6, a distribution plate 7, a mechanical seal 8, a side cover 9, a mechanical seal box body 10, a screw plug 11, a liquid inlet 12, a notch channel 13 and a liquid outlet 14. The main shaft 4 is arranged in the pump body 1, a shaft end retainer ring 3, an impeller 2 and a shaft sleeve 6 are sequentially arranged from one end to the other end of the main shaft 4, a distribution plate 7 is arranged at the joint of the pump body 1 and a side cover 9, a screw plug 11 is arranged on the distribution plate 7, a liquid inlet 12 is arranged on the side cover 9, and the liquid inlet 12 is communicated with a liquid outlet 14 on the mechanical seal box body 10 through a notch channel 13.

The mechanical seal 8 is arranged in the side cover 9, and two ends of the mechanical seal 8 are closed by the distribution plate 7 and the mechanical seal box body 10. The installation structure adopted in the embodiment can separate the mechanical seal 8 from the working fluid in the pump body 1, and meanwhile, the installation space of the mechanical seal 8 is enlarged, so that the embodiment can adopt mechanical seals with various structural types and different materials. For example, a single-sided mechanical seal or a double-sided mechanical seal may be selected. The flushing mode of the mechanical seal 8 may be either external flushing or internal flushing.

Example 2

The basic structure of this embodiment is the same as that of embodiment 1, with a slight difference that in this embodiment, a mechanical seal 8 is mounted on the sleeve 6. The shaft sleeve 6 is provided with the O-shaped sealing ring 5,O which can seal one end of the impeller 2, and the other end of the impeller 2 is sealed by the sealing glue or the sealing gasket of the shaft end retainer ring 3, so that the main shaft 4 is not contacted with the working fluid any more due to the structure adopted by the embodiment, and therefore, the material of the main shaft 4 is not influenced by the components of the working fluid any more.

Two embodiments of the mechanical seal mounting structure of the cantilever type liquid ring vacuum pump of the present utility model are described above with reference to the accompanying drawings, and the following further describes the conversion of the double-end mechanical seal and the single-pump end mechanical seal and the conversion method of the flushing mode thereof:

as shown in fig. 2 and 3, when the two-end mechanical seal and the single-pump end mechanical seal are changed, the change of the mechanical seal 8 (inner core) is only needed, and the other parts do not need to be changed, and the method for changing the flushing mode is as follows:

a. when the machine seal is washed out, washing liquid is supplied from a liquid inlet 12 on the side cover 9 and enters the machine seal through a notch channel 13, and then the washing liquid is discharged from a liquid outlet 14 on the machine seal box body 10;

b. when the machine seal is converted into internal flushing, the screw plug 11 on the distribution plate 7 is disassembled, a channel connected with the pump cavity is opened, and then the liquid inlet 12 on the side cover 9 and the liquid outlet 14 of the machine seal box body 10 are blocked by the screw plug 11. The working fluid flows in from the pump cavity through the channel at the screw plug 11, then enters the machine seal through the notch channel 13, and the redundant working fluid flows back into the pump cavity from the gap between the bearing 6 and the distribution plate 7.

Claims

1. The mechanical seal mounting structure of the cantilever type liquid ring vacuum pump, its working object is the cantilever type liquid ring vacuum pump, including pump body, impeller, shaft end retainer ring, main shaft, axle sleeve, distributing plate, mechanical seal, side cover, machine seal letter body, screw plug, liquid inlet, notched channel and liquid outlet; the main shaft is arranged in the pump body, a shaft end check ring, an impeller and a shaft sleeve are sequentially arranged from one end of the main shaft to the other end of the main shaft, the distributing plate is arranged at the joint of the pump body and the side cover, the screw plug is arranged on the distributing plate, the liquid inlet is arranged on the side cover, and the liquid inlet is communicated with the liquid outlet on the mechanical seal box body through a notch channel;

the method is characterized in that: the mechanical seal is arranged in the side cover, and two ends of the mechanical seal are closed through the distribution plate and the mechanical seal box body;

or the mechanical seal is arranged on the shaft sleeve, an O-shaped sealing ring is further arranged on the shaft sleeve, one end of the impeller is sealed by the O-shaped sealing ring, and the other end of the impeller is sealed by sealing glue or a sealing gasket of the shaft end retainer ring.

2. The mechanical seal mounting structure of a cantilever-type liquid ring vacuum pump of claim 1, wherein: the mechanical seal is a single-end-face mechanical seal or a double-end-face mechanical seal.