Non-contact shaft sealing structure
By adopting a non-contact shaft seal structure in the screw compressor, and utilizing the clearance fit between the shaft body and the shaft hole, the combination of the gas distribution groove and the labyrinth seal groove, a gas seal and a thread seal are formed, which solves the problems of high power consumption and wear of contact seals, achieves low power consumption and high reliability, and extends the seal life.
Patent Information
- Application Number
- CN202423296389.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The existing contact seal structure of screw compressors has problems such as high power consumption, rapid wear, and oil leakage risk. Existing technologies have not been able to effectively solve the problem of rapid wear of existing contact seals, and the existing technologies have not been able to effectively solve the problem of sealing reliability.
It adopts a non-contact shaft seal structure, including a clearance fit between the shaft body and the shaft hole, a combination of gas distribution groove and labyrinth seal groove, and uses pressurized gas to form a gas seal and a labyrinth seal, combined with a thread seal to form a multi-layer sealing protection.
It achieves low power consumption, improves sealing reliability, extends the sealing structure, extends the sealing device life, improves the sealing life and reliability, and reduces wear and oil leakage risks.
Smart Images
Figure CN223634903U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a shaft seal technical field especially relates to a non -contact type's shaft seal structure. BACKGROUND
[0002] As an important industrial general equipment, screw compressor is widely used in air power, chemical industry and other industrial fields. The sealing of the shaft of the screw compressor in the past generally adopts lip type skeleton oil seal or mechanical seal, but these seals are all contact type seals, and there is certain power consumption. And the contact type seal wears fast, and the oil seal needs to be replaced regularly, otherwise there is the risk of oil leakage. Therefore, a new type of sealing structure is developed, which is a non-contact sealing structure, has high sealing reliability, reduces power consumption and prolongs the service life. SUMMARY
[0003] The utility model discloses a non -contact type's shaft seal structure, which aims at reducing power consumption, prolonging the service life of the shaft body and the sealing structure, and improving the sealing reliability.
[0004] Technical scheme: in order to realize the above-mentioned purpose, a non -contact type's shaft seal structure of the utility model, including shaft body and sealing seat, the shaft hole is set up on the sealing seat, the shaft body is inserted in the shaft hole, and the shaft body is matched with the clearance of the shaft hole, so that the shaft body and the shaft hole are in non -contact state;The hole wall of the shaft hole is provided with a gas distribution groove, and a plurality of labyrinth seal grooves are arranged on the two sides of the gas distribution groove, so that the two sides of the gas distribution groove form first labyrinth seal and second labyrinth seal respectively;The gas distribution groove is connected with the gas supply equipment, and the gas supply equipment can provide the gas distribution groove with pressure gas, so that the gas distribution groove is in a positive pressure gas environment, and a gas seal is formed between the shaft body and the shaft hole.
[0005] Further, the sealing seat is provided with a vent hole, one end of the vent hole is communicated with the gas distribution groove, and the other end of the vent hole is connected with the gas supply equipment of the outside.
[0006] Further, the two sides of the sealing seat are air side and oil injection side respectively, the first labyrinth seal is close to the air side, and the second labyrinth seal is close to the oil injection side;The hole wall close to the air side of the shaft hole is also provided with a threaded groove, and the threaded groove and the shaft body form a threaded seal, and the first labyrinth seal is located between the gas distribution groove and the threaded seal.
[0007] Further, the width of the first labyrinth seal is less than the width of the second labyrinth seal;The sum of the width of the first labyrinth seal and the threaded seal is greater than the width of the second labyrinth seal.
[0008] Further, the gas distribution groove and the labyrinth seal groove are all annular groove bodies.
[0009] Further, the depths of the labyrinth sealing grooves are consistent, and the depth of the air distribution groove is greater than the depth of the labyrinth sealing groove, and the depth of the labyrinth sealing groove is greater than the depth of the thread groove.
[0010] Beneficial effects: the non-contact type shaft sealing structure of the utility model, the shaft body and the shaft hole are in non-contact state, so as to reduce the power consumption of the sealing part, the labyrinth sealing, the thread sealing and the air sealing are formed between the shaft hole and the shaft body, the three kinds of sealing cooperate with each other, so that the sealing reliability between the shaft body and the shaft hole is high. BRIEF DESCRIPTION OF DRAWINGS
[0011] ATTACHED Figure 1 It is a schematic view of the shaft sealing structure of the utility model. DETAILED DESCRIPTION
[0012] The utility model will be described further in connection with the drawings.
[0013] As attached Figure 1 The non-contact type shaft sealing structure, including shaft body 1 and sealing seat 2, the sealing seat 2 is set up with shaft hole 3, shaft body 1 is correspondingly inserted in shaft hole 3, and the clearance fit between shaft body 1 and shaft hole 3 makes the non-contact state between shaft body 1 and shaft hole 3, thereby reducing the power consumption of the sealing part between shaft body 1 and shaft hole 3, and improving the life.
[0014] As attached Figure 1 Indicated, the air distribution groove 4 is provided with a plurality of labyrinth sealing grooves 5 on the hole wall of the shaft hole 3, so that the two sides of the air distribution groove 4 form the first labyrinth sealing 6 and the second labyrinth sealing 7 respectively. The air distribution groove 4 is connected with the gas supply equipment 8, and the gas supply equipment 8 can provide the air distribution groove 4 with pressurized gas, so that the air distribution groove 4 is in a positive pressure gas environment. The pressurized gas is distributed from the air distribution groove 4 to the space between the shaft body 1 and the shaft hole 3, so that the air sealing is formed between the shaft body 1 and the shaft hole 3. Through the cooperation of the labyrinth sealing and the air sealing, the sealing reliability between the shaft body 1 and the shaft hole 3 is high.
[0015] The sealing seat 2 is provided with a vent hole 9, one end of the vent hole 9 is communicated with the air distribution groove 4, and the other end of the vent hole 9 is connected with the gas supply equipment 8 outside, and the gas supply equipment 8 can provide the air distribution groove 4 with pressurized gas through the vent hole 9.
[0016] The two sides of the seal seat 2 are an air side 10 and an oil injection side 11 respectively, the air side 10 of the seal seat 2 has external air, and the oil injection side 11 of the seal seat 2 has oil mist.
[0017] The width of the first labyrinth seal 6 is smaller than the width of the second labyrinth seal 7, and the sum of the width of the first labyrinth seal 6 and the width of the thread seal is greater than the width of the second labyrinth seal 7.
[0018] The air distribution on both sides of the air distribution groove 4 is more uniform.
[0019] The air distribution groove 4 and the labyrinth seal groove 5 are annular groove bodies, and the depths of the labyrinth seal grooves 5 are consistent. The depth of the air distribution groove 4 is greater than the depth of the labyrinth seal groove 5, so that more pressurized air can be stored in the air distribution groove 4. The depth of the labyrinth seal groove 5 is greater than the depth of the thread groove 12, so that the thread groove 12 can better block dust. The shaft sealing structure of the utility model is applied to the sealing of the shaft of a screw compressor, the rotation of the shaft body 1 forms a labyrinth seal in cooperation with the seal seat 2, in addition, pressurized air enters the air distribution groove 4 through the air hole 9, forms an air seal after being distributed by the air distribution groove 4, and the oil mist on the oil injection side 11 cannot pass through the two combined seals.
[0020] The above is only the preferred embodiment of the utility model, and it should be noted that: for ordinary skilled persons in the technical field, several improvements and refinements can be made without departing from the principles of the utility model, and these improvements and refinements should also be regarded as the protection range of the utility model.
Claims
1. A non-contact shaft seal structure, characterized by: The sealing seat (2) is provided with a vent hole (9), one end of the vent hole (9) is communicated with the gas distribution groove (4), and the other end of the vent hole (9) is connected with the gas supply equipment (8) outside.
2. A non-contact shaft seal structure according to claim 1, wherein: The sealing seat (2) is provided with a vent hole (9), one end of the vent hole (9) is communicated with the gas distribution groove (4), and the other end of the vent hole (9) is connected with the gas supply equipment (8) outside.
3. A non-contact shaft seal structure according to claim 1, wherein: The sealing seat (2) is provided with a vent hole (9), one end of the vent hole (9) is communicated with the gas distribution groove (4), and the other end of the vent hole (9) is connected with the gas supply equipment (8) outside.
4. A non-contact shaft seal structure according to claim 3, wherein: The width of the first labyrinth seal (6) is smaller than the width of the second labyrinth seal (7); the sum of the width of the first labyrinth seal (6) and the width of the thread seal is greater than the width of the second labyrinth seal (7).
5. A non-contact shaft seal structure according to claim 3, wherein: The gas distribution groove (4) and the labyrinth seal groove (5) are both annular groove bodies.
6. A non-contact shaft seal structure according to claim 3, wherein: The depths of the labyrinth seal grooves (5) are consistent, the depth of the gas distribution groove (4) is greater than the depth of the labyrinth seal groove (5), and the depth of the labyrinth seal groove (5) is greater than the depth of the thread groove (12).