CN112065722A

CN112065722A - Claw type pump rotor end face sealing structure and claw type pump

Info

Publication number: CN112065722A
Application number: CN202010774382.9A
Authority: CN
Inventors: 冯健美; 侯天放; 彭学院; 王雷雷
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2020-12-11

Abstract

The invention belongs to the field of compressors, and particularly relates to a claw type pump rotor end face sealing structure and a claw type pump. A sealing structure for the end face of a rotor of a claw pump comprises a sealing groove, wherein the sealing groove is arranged on the end face of the rotor, and a sealing element is arranged in the sealing groove; an elastic element is arranged in the sealing groove and pushes the sealing element to make the sealing element contact with the inner end face of the cylinder body; the sealing element is made of a solid self-lubricating material. The invention can effectively reduce the leakage rate of the end face clearance of the claw type pump, ensure that the sealing structure can stably and reliably operate all the time when working for a long time, and improve the efficiency and the reliability of the claw type pump.

Description

Claw type pump rotor end face sealing structure and claw type pump

Technical Field

The invention belongs to the field of compressors, and particularly relates to a claw type pump rotor end face sealing structure and a claw type pump.

Background

The claw type pump belongs to a volume rotary compressor, is a gas supercharging and conveying machine, and comprises the following main parts: rotors, cylinders, gearboxes, synchronizing gears, bearing seals, etc. When the claw pump works, a pair of rotors meshed with each other are driven by a pair of synchronous gears outside the cylinder to rotate in opposite directions, and the air suction port and the air exhaust port are isolated from each other by means of meshing of the two rotors (actually, the two rotors are not in contact and a small meshing gap is reserved between the two rotors). In the rotating process, the air in the cylinder volume is pushed to the exhaust port from the air suction port, and a certain internal compression process is realized, so that the purposes of air pressurization and conveying are achieved.

The working volume inside the cylinder of the claw pump is not completely isolated in practical situations, and gas can leak from the exhaust side to the suction side through some small gaps, which can lead to the effects of reduced volumetric efficiency, increased power consumption, increased exhaust temperature, etc. of the claw pump, and therefore leakage through the gaps should be avoided as much as possible. The surface of the rotor and the cylinder perpendicular to the axial direction is called an end surface, and the position with the largest radius of the rotor is called a rotor tooth top when viewed from the end surface direction, so that the leakage clearance when the claw pump works is mainly divided into: 1. an end surface gap is formed between the end surface of the rotor and the inner end surface of the cylinder; 2. tooth top clearance formed by rotor tooth top and cylinder wall; 3. the rotor and the rotor are in the gap between the teeth. The end face clearance is a major improvement in claw pump leakage.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a sealing structure for the end face of a rotor of a claw type pump, which can effectively reduce the leakage amount of the end face clearance of the claw type pump, ensure that the sealing structure can stably and reliably operate all the time when working for a long time, and improve the efficiency and reliability of the claw type pump.

The technical scheme for realizing the functions is as follows:

a claw type pump rotor end face sealing structure is characterized in that:

the sealing structure comprises a sealing groove, wherein the sealing groove is arranged on the end face of a rotor, and a sealing element is arranged in the sealing groove; an elastic element is arranged in the sealing groove and pushes the sealing element to make the sealing element contact with the inner end face of the cylinder body; the sealing element is made of a solid self-lubricating material.

Further, a hole is formed in the sealing groove, and the elastic element is arranged in the hole.

Further, the elastic element is a compression spring.

Furthermore, the structure of the hole can be a blind hole or a through hole;

when the blind hole is formed, one end of the compression spring is arranged in the blind hole, and the other end of the compression spring is in contact with the sealing element;

when the through hole is formed, the compression spring penetrates through the hole, and two ends of the compression spring are respectively contacted with the sealing pieces on the end faces of two ends of the rotor.

Further, the sealing groove should be arranged in a closed loop along the rotor end face profile, while being as close to the end face edge as possible to enhance the sealing effect.

In addition, the invention also provides a claw type pump, which is characterized in that:

the rotor is arranged in the cylinder body;

the claw type pump rotor end face sealing structure is arranged between the cylinder body and the rotor.

The invention has the advantages that:

1) the arrangement method of the sealing groove is selected according to the flow path of the gas in the end face gap of the claw type pump in the simulation result, has the particularity particularly suitable for the claw type pump, and can effectively isolate most gas leakage channels;

2) the method for providing thrust through the elastic element has the advantages of simple structure and low cost, and compared with the scheme that the sealing strip cannot float, the method for providing thrust through the elastic element releases and compensates the abrasion loss of the sealing strip after long-time operation through the deformation of the elastic element, so that the sealing structure is stable and reliable.

Drawings

FIG. 1 is a schematic structural view of a sealing structure of an end face of a claw type pump rotor according to the invention;

fig. 2 is a sectional view of a sealing structure of an end face of a claw pump rotor according to the present invention.

The reference numbers in the figures illustrate: 1-rotor, 2-cylinder body inner end face, 3-sealing piece, 4-elastic element, 5-cylinder body, 6-sealing groove, 7-hole and 8-shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Referring to fig. 1, a claw pump rotor end face sealing structure, a rotor 1 rotates around a shaft 8 in a cylinder block 5, and cylinder inner end faces 2 are arranged on two sides in the cylinder block 5. The end face of the rotor 1 is provided with a sealing groove 6, a sealing element 3 is arranged in the sealing groove 6, the arrangement of the sealing groove 6 should be as close to the boundary of the shaft end face of the rotor 1 as possible and form a closed path, the arrangement mode of the sealing groove 6 is determined according to a simulation result, and a flow channel of gas in an end face gap can be effectively isolated. A plurality of bores 7 are provided in the sealing groove 6, and elastic elements 4 are provided in the bores 7 for providing a pushing force for pressing the sealing element 3 against the cylinder inner end face 2. The diameter of the hole 7 should be smaller than or equal to the width of the sealing groove 6 to ensure that the elastic element 4 can press against the bottom surface of the sealing element 3, and the depth of the hole 7 can be selected according to the size of the elastic element 4.

Preferably, the elastic element 4 is a compression spring. When the hole 7 is a blind hole, one end of the compression spring is arranged in the hole 7, and the other end of the compression spring is contacted with the sealing element 3; in the case of a through hole, the compression spring passes through the hole 7, and the two ends of the compression spring respectively push the sealing elements 3 on the end surfaces of the two ends of the rotor to be tightly pressed on the inner end surface 2 of the cylinder.

Referring to fig. 2, due to the machining and assembly accuracy, there is always a slight gap between the end face of the rotor 1 and the cylinder inner end face 2, which will result in leakage of the working medium in the compression chamber from the high pressure side to the low pressure side through the gap. The sealing element 3 is arranged in the sealing groove 6, the sealing element 3 is exposed out of the sealing groove 6, and the elastic element 4 below the sealing element 3 ensures that the sealing element 3 is pressed on the inner end surface 2 of the cylinder no matter whether the sealing element 3 is worn or not in the operation process.

The sealing element 3 is a sealing strip and is made of a solid self-lubricating material. Solid self-lubricating material is meant to reduce the effects of frictional wear between two bearing surfaces by means of a solid powder, film or some monolithic material. In the process of solid lubrication, the solid lubricating material and the surrounding medium have physical and chemical reactions with the friction surface to generate a solid lubricating film, so that the friction and the wear are reduced, and the power loss and the temperature rise of a friction pair are reduced. The sealing strip is made of a solid self-lubricating material, so that the abrasion and the power consumption of the sealing strip can be reduced while the sealing effect is ensured.

The sealing device can realize the sealing of the axial clearance of the rotor under the full rotation angle, the clearance of the end surface of the claw type pump automatically reaches the minimum value after the self-lubricating sealing strip is in running-in, and the thrust of the elastic element 4 can ensure that the sealing strip is always pressed on the inner end surface 2 of the cylinder and can compensate the abrasion loss of the sealing strip after long-time operation.

The invention also provides a claw type pump, which comprises a cylinder body 5 and a rotor 1, wherein the rotor 1 is arranged in the cylinder body 5; the claw type pump rotor end face sealing structure is arranged between the cylinder body 5 and the rotor 1.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present specification and the accompanying drawings, or directly or indirectly applied to other related system fields, are included in the scope of the present invention.

Claims

1. The utility model provides a claw formula pump rotor terminal surface seal structure which characterized in that includes the following step:

the rotor comprises a sealing groove (6), wherein the sealing groove (6) is arranged on the end face of a rotor (1), and a sealing element (3) is arranged in the sealing groove (6); an elastic element (4) is arranged in the sealing groove (6), and the elastic element (4) pushes the sealing element (3) and enables the sealing element (3) to be in contact with the inner end face (2) of the cylinder body (5); the sealing element (3) is made of a solid self-lubricating material.

2. The claw pump rotor end face seal structure according to claim 1, wherein:

a hole (7) is formed in the sealing groove (6), and the elastic element (4) is arranged in the hole (7).

3. The claw pump rotor end face seal structure according to claim 2, wherein:

the elastic element (4) is a compression spring.

4. A claw pump rotor end face seal structure according to claim 3, characterized in that:

the structure of hole (7) is the blind hole, compression spring's one end sets up in hole (7), and the other end contacts with sealing member (3).

5. A claw pump rotor end face seal structure according to claim 3, characterized in that:

the structure of hole (7) is the through-hole, compression spring passes hole (7), and its both ends contact with sealing member (3) of rotor (1) both ends terminal surface respectively.

6. The sealing structure for the end face of the rotor of the claw pump according to any one of claims 1 to 5, wherein:

the sealing groove (6) is arranged in a closed loop along the profile of the end face of the rotor (1).

7. The sealing structure for the end face of the rotor of the claw pump according to any one of claims 1 to 5, wherein:

the number of the holes (7) is multiple.

8. A claw pump characterized by:

the rotor comprises a cylinder body (5) and a rotor (1), wherein the rotor (1) is arranged in the cylinder body (5);

the claw type pump rotor (1) end face sealing structure of any one of claims 1-7 is arranged between the cylinder body (5) and the rotor (1).