CN219570335U

CN219570335U - Balanced mechanical seal Roots vacuum pump

Info

Publication number: CN219570335U
Application number: CN202321167160.6U
Authority: CN
Inventors: 陈宇浩; 陈全玉
Original assignee: Jiangyin Quanyu Energy Saving And Environmental Protection Vacuum Equipment Manufacturing Co ltd
Current assignee: Jiangyin Quanyu Energy Saving And Environmental Protection Vacuum Equipment Manufacturing Co ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-08-22
Anticipated expiration: 2033-05-16

Abstract

The utility model relates to a balanced mechanical seal Roots vacuum pump, which comprises a pump body, a front end cover, a front cover, a coupler, a rear end cover, a rear cover, a bearing seat, a bearing and a motor, wherein the bearing seat is arranged in the front cover and is fixed on the front end cover; a bearing seat is arranged in the rear cover and is fixed on the rear end cover; the center of the bearing seat is provided with at least one stage of step hole, and a bearing is embedded in a first stage of step hole of the bearing seat; the front end of the main shaft extends out of the front cover and is connected with a coupler, and the coupler is connected with a motor; a gear is arranged in the rear cover, and the gear is sleeved at the tail end of the main shaft; two groups of mechanical seals are adopted between the front end cover and the main shaft, and two groups of mechanical seals are adopted between the rear end cover and the main shaft; and the shaft outlet end of the main shaft is provided with two mechanical seals. The utility model adopts the balance type mechanical seal with better reliability and longer service life, and is provided with the bearing seat, thereby being convenient for disassembly and assembly and adjusting the gap.

Description

Balanced mechanical seal Roots vacuum pump

Technical Field

The utility model relates to the technical field of vacuum equipment, in particular to a balanced mechanical seal Roots vacuum pump.

Background

The large and medium Roots vacuum pump mainly refers to a Roots vacuum pump with the pumping capacity of more than 5000L/s, and the demand of the large and medium Roots vacuum pump in China rapidly rises in recent years, and particularly, a large number of large and medium Roots vacuum pumps are required in the process of vacuum degassing in chemical industry, pharmaceutical industry, petroleum industry, refining industry and the like and in large-scale space simulation wind tunnel test devices. The bearing seat and the sealing structure of the large Roots vacuum pump produced at present are not perfect enough and need to be improved and perfected.

Referring to fig. 1, fig. 1 is a partial structural cross-sectional view of a conventional large and medium-sized roots vacuum pump, in which four labyrinth seal mechanisms are disposed in front and rear end covers of the conventional roots vacuum pump to isolate the mutual interference between an evacuated body and lubricating oil in the front and rear covers; the main shaft goes out the axle head and has set up two lip seals and be used for sealing the lubricating oil leakage in the vacuum pump oil tank, and the structure of current large and medium-sized roots vacuum pump has following problem:

(1) The bearing is directly fixed in the end cover, once the end surface clearance between the rotor and the pump body changes after the vacuum pump runs for a long time, the end surface clearance between the rotor and the pump body cannot be adjusted by a simple method, and the clearance can be adjusted by adding a gasket in the end surface of the inner side of the bearing after the whole Roots vacuum pump is disassembled;

(2) Because the bearings are directly fixed in the front end cover and the rear end cover, the disassembly and the assembly of the bearings are very difficult, especially, the condition that the hoisting equipment is not perfect is commonly existed in the field of users, and once the vacuum pump needs to replace the bearings or adjust the end face clearance between the rotor and the pump body, the whole vacuum pump is disassembled, thus causing the maintenance difficulty;

(3) The lubrication and cooling method of the bearing is insufficient, so that the temperature rise of the bearing is large, and the service life of the bearing is influenced;

(4) By adopting a two-way framework oil seal sealing structure, the rubber of the framework oil seal is easy to wear due to the influence of the surface finish of the shaft sleeve due to the high-speed friction between the framework oil seal and the surface of the shaft sleeve, and the service life of the framework oil seal is short, so that the normal service life of the large and medium Roots vacuum pump is influenced;

(5) The axial dynamic seal in the front end cover and the rear end cover adopts a piston ring labyrinth, and because a certain gap is arranged between the piston ring and a piston groove, the vacuum pump oil in the oil tanks at the two ends of the pump easily enters the pump cavity, and the pumped body also pollutes the vacuum pump oil, so that the service lives of the gears and the bearings are easily shortened.

The existing large and medium Roots vacuum pump is easy to damage bearings and gears in a short period due to poor lubrication in the use process of the vacuum pump because of unreasonable design structure, and is difficult to assemble, disassemble and maintain on site.

Disclosure of Invention

The utility model aims to overcome the defects and provide the balanced mechanical seal Roots vacuum pump, which adopts the balanced mechanical seal with better reliability and longer service life, and is provided with the bearing seat, thereby being convenient for disassembly and adjustment of the gap.

The purpose of the utility model is realized in the following way:

the utility model provides a balanced mechanical seal roots vacuum pump, it includes the pump body, front end housing, protecgulum, shaft coupling, rear end housing, rear cover, bearing frame, bearing and motor, the front end of the pump body is equipped with the front end housing, and the rear end is equipped with the rear end housing, the inside horizontal direction parallel arrangement of the pump body is a pair of three-leaf involute rotor, the rotor is installed on main shaft and rotor shaft, main shaft and rotor shaft set up in the pump body, the rotor shaft is supported and is fixed in front end housing and rear end housing by four bearings in the front end housing and the rear end housing respectively; the front end cover is provided with a front cover, and the rear end cover is provided with a rear cover;

a bearing seat is arranged in the front cover and is fixed on the front end cover; a bearing seat is arranged in the rear cover and is fixed on the rear end cover; the center of the bearing seat is provided with at least one stage of step hole, and a bearing is embedded in a first stage of step hole of the bearing seat; the front end of the main shaft extends out of the front cover and is connected with a coupler, and the coupler is connected with a motor; a gear is arranged in the rear cover, and the gear is sleeved at the tail end of the main shaft; two groups of mechanical seals are adopted between the front end cover and the main shaft, and two groups of mechanical seals are adopted between the rear end cover and the main shaft; and the shaft outlet end of the main shaft is provided with two mechanical seals.

Further, an air inlet is formed in the upper end and the lower end of the pump body respectively.

Further, the front end cover is fixedly connected to the front end of the pump body through an inner hexagon screw, and the rear end cover is fixedly connected to the rear end of the pump body through an inner hexagon screw; the front cover is provided with a front cover, and the front cover is fixedly connected to the front side of the front cover by an inner hexagon screw.

Further, an oil inlet and an oil inlet groove are formed in the bearing seat.

Further, cooling water spacers are arranged in the front end cover and the rear end cover.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model improves the internal structure of the front and rear end covers, adds four bearing seats in the front and rear end covers, improves the four groups of sealing structures in the front and rear end covers and the dynamic sealing structure at the output shaft end of the main rotor, and changes the existing two-channel lip seal into a balanced mechanical seal with better reliability and longer service life;

according to the utility model, four bearing seats are added in the front end cover and the rear end cover, the bearings are firstly arranged in the bearing seats, and then the bearing seats are arranged in the front end cover and the rear end cover, so that the structure is convenient for the replacement of the bearings and the adjustment of the end face clearance of the rotor, and when the bearings are replaced, the corresponding bearings and the bearing seats are pulled out from the front end cover and the rear end cover through dismounting screws; if the gap between the rotor and the end face of the pump body is to be adjusted, the bearing seat is jacked up by using a dismounting screw, then a thin copper sheet with proper thickness is filled in the joint surface of the bearing seat and the end cover, and then the bearing seat is fixed, so that the dismounting and the gap adjustment are very convenient and simple.

The utility model adopts a group of balance type mechanical seal, because the dynamic and static rings of the mechanical seal are made of hard alloy with hardness close to that of diamond, and the machining precision of the wiping surface meets the requirements of a mirror surface, the mechanical seal has better sealing performance, the friction coefficient of the friction surface is smaller, the heat generation of the mechanical seal is less, and the friction surface of the mechanical seal is hardly worn, thus greatly prolonging the service life of the mechanical seal; the service life of the mechanical seal is about five times of that of the framework oil seal.

According to the utility model, the oil inlet and the oil inlet groove are formed in the bearing seat, so that the lubricating oil inlet amount of the bearing is increased, the lubricating and cooling effects of the bearing are improved, the service life of the bearing can be prolonged, the maintenance cost is reduced, the reliability and the practicability of the product are improved, and the maintenance and the repair of the product by a user are facilitated.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

FIG. 2 is a cross-sectional view of the present utility model.

Fig. 3 is a partial enlarged view at a of fig. 1.

Fig. 4 is a partial enlarged view at B of fig. 1.

Fig. 5 is a cross-sectional view of the bearing housing of the present utility model.

Fig. 6 is a front view of the bearing housing of the present utility model.

Wherein:

pump body 1, air inlet 1.1, front end housing 2, front cover 3, shaft coupling 4, rear end housing 5, rear cover 6, bearing frame 7, oil inlet groove 7.1, bearing 8, gear 9, mechanical seal 10, motor 11, main shaft 12, rotor shaft 13, rotor 14.

Description of the embodiments

In order to better understand the technical solution of the present utility model, the following detailed description will be made with reference to the accompanying drawings. It should be understood that the following embodiments are not intended to limit the embodiments of the present utility model, but are merely examples of embodiments that may be employed by the present utility model. It should be noted that, the description herein of the positional relationship of the components, such as the component a being located above the component B, is based on the description of the relative positions of the components in the drawings, and is not intended to limit the actual positional relationship of the components.

Example 1

Referring to fig. 1-6, fig. 1 depicts a schematic structural view of the present utility model. As shown in the figure, the balanced mechanical seal Roots vacuum pump comprises a pump body 1, a front end cover 2, a front cover 3, a coupler 4, a rear end cover 5, a rear cover 6, a bearing seat 7, a bearing 8 and a motor 11, wherein the front end of the pump body 1 is provided with the front end cover 2, the rear end is provided with the rear end cover 5, a pair of three-leaf involute rotors 14 are arranged in parallel in the horizontal direction inside the pump body 1, the rotors 14 are arranged on a main shaft 12 and a rotor shaft 13, the main shaft 12 and the rotor shaft 13 are arranged in the pump body, and the rotor shaft 13 is respectively supported by four bearings in the front end cover 2 and the rear end cover 5 and is fixed in the front end cover 2 and the rear end cover 5; the upper end and the lower end of the pump body 1 are respectively provided with an air inlet 1.1.

The front end cover 2 is fixedly connected to the front end of the pump body 1 by using an inner hexagon screw, and the rear end cover 5 is fixedly connected to the rear end of the pump body 1 by using an inner hexagon screw; the front cover 2 is provided with a front cover 3, the front cover 3 is fixedly connected to the front side of the front cover 2 by using an inner hexagon screw, the rear cover 5 is provided with a rear cover 6, and the rear cover 6 is fixedly connected to the rear side of the rear cover 5 by using an inner hexagon screw.

Two bearing seats 7 are arranged in the front cover 3, and the bearing seats 7 are fixed on the front end cover 2; two bearing seats 7 are arranged in the rear cover 6, and the bearing seats 7 are fixed on the rear end cover 5; the center of the bearing seat 7 is provided with at least one stage of step hole, and a bearing 8 is embedded in a first stage of step hole of the bearing seat 7.

The front end (shaft outlet end) of the main shaft 12 extends out of the front cover 3 and is connected with the coupler 4, and the coupler 4 is connected with the motor 11; the rear cover 6 is internally provided with a gear 9, and the gear 9 is sleeved at the tail end of the main shaft 12.

Two groups of mechanical seals 10 are adopted between the front end cover 2 and the main shaft 12, and two groups of mechanical seals 10 are adopted between the rear end cover 5 and the main shaft 12; the output shaft end of the main shaft 12 is provided with two mechanical seals 10.

An oil inlet and an oil inlet groove 7.1 are formed in the bearing seat 7.

And cooling water spacers are arranged in the front end cover 2 and the rear end cover 5.

Working principle:

according to the balanced mechanical seal Roots vacuum pump, the motor provides torque for the driving rotor through the coupler, and the driving rotor enables the driving rotor and the driven rotor to rotate in the synchronous direction in the pump body through the pair of synchronous gears in the rear cover and continuously completes air suction and exhaust. The cooling water spacer bush is added in the front end cover and the rear end cover, the sealing structure of the end cover is improved, and the lip seal cooled by an oil bath, the framework oil seal and the nitrogen gas barrier composite sealing structure can effectively prevent the medium in the pumped medium from entering the bearing and the oil tank, prevent the emulsification and corrosion of lubricating oil and further prolong the service life of the transmission parts such as the gear, the bearing and the like. The bearing pedestal is processed in a numerical control mode, so that the accuracy of the whole Roots vacuum pump is not affected after the bearing is installed, and the service life of the bearing can be prolonged.

The foregoing is merely a specific application example of the present utility model, and the protection scope of the present utility model is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the utility model.

Claims

1. A balanced mechanical seal roots vacuum pump is characterized in that: the novel three-blade involute rotor comprises a pump body (1), a front end cover (2), a front cover (3), a coupler (4), a rear end cover (5), a rear cover (6), a bearing seat (7), a bearing (8) and a motor (11), wherein the front end of the pump body (1) is provided with the front end cover (2), the rear end of the pump body is provided with the rear end cover (5), a pair of three-blade involute rotors (14) are arranged in parallel in the horizontal direction inside the pump body (1), the rotors (14) are arranged on a main shaft (12) and a rotor shaft (13), the main shaft (12) and the rotor shaft (13) are arranged in the pump body, and the rotor shaft (13) is supported by the front end cover (2) and the four bearings in the rear end cover (5) respectively and is fixed in the front end cover (2) and the rear end cover (5); a front cover (3) is arranged on the front end cover (2), and a rear cover (6) is arranged on the rear end cover (5);

a bearing seat (7) is arranged in the front cover (3), and the bearing seat (7) is fixed on the front end cover (2); a bearing seat (7) is arranged in the rear cover (6), and the bearing seat (7) is fixed on the rear end cover (5); the center of the bearing seat (7) is provided with at least one stage of step hole, and a bearing (8) is embedded in a first stage of step hole of the bearing seat (7); the front end of the main shaft (12) extends out of the front cover (3) and is connected with the coupler (4), and the coupler (4) is connected with the motor (11); a gear (9) is arranged in the rear cover (6), and the gear (9) is sleeved at the tail end of the main shaft (12); two groups of mechanical seals (10) are adopted between the front end cover (2) and the main shaft (12), and two groups of mechanical seals (10) are adopted between the rear end cover (5) and the main shaft (12); the output shaft end of the main shaft (12) is provided with two mechanical seals (10).

2. A balanced mechanically sealed roots vacuum pump according to claim 1, wherein: the upper end and the lower end of the pump body (1) are respectively provided with an air inlet (1.1).

3. A balanced mechanically sealed roots vacuum pump according to claim 1, wherein: the front end cover (2) is fixedly connected to the front end of the pump body (1) through an inner hexagon screw, and the rear end cover (5) is fixedly connected to the rear end of the pump body (1) through an inner hexagon screw; the front end cover (2) is provided with a front cover (3), and the front cover (3) is fixedly connected to the front side of the front end cover (2) through an inner hexagon screw.

4. A balanced mechanically sealed roots vacuum pump according to claim 1, wherein: an oil inlet and an oil inlet groove (7.1) are arranged on the bearing seat (7).

5. A balanced mechanically sealed roots vacuum pump according to claim 1, wherein: and cooling water spacers are arranged in the front end cover (2) and the rear end cover (5).