Magnetic driving shaft with static sealing structure for oil-free compressor

Abstract

The utility model relates to the technical field of magnetic driving shafts, in particular to a magnetic driving shaft with a static sealing structure for an oilless compressor, which comprises a shaft sleeve, a protective sleeve and a positioning mechanism, the protective sleeve is arranged in the shaft sleeve, and a driving shaft body is rotatably arranged in the protective sleeve; a sealing groove is formed in the side wall of one end of the shaft sleeve, a sealing ring is arranged on the side, facing the side wall of the shaft sleeve, of the protective sleeve, and a first sealing ring is arranged between the sealing ring and the sealing groove. A positioning groove is formed in the outer side wall of the protective sleeve; the positioning mechanism comprises a positioning sleeve, a positioning ring is arranged on the side wall of the positioning sleeve, the positioning ring is arranged in the positioning groove, and a second sealing ring is arranged between the peripheral wall of the positioning ring and the inner wall of the positioning groove; the positioning sleeve is fixedly connected with the shaft sleeve. The driving shaft has good sealing performance when the driving shaft body runs, meanwhile, the damage of a traditional driving shaft to a sealing piece is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic drive shafts, in particular to a magnetic drive shaft for an oil-free compressor with a static sealing structure. Background Art

[0002] The magnetic drive shaft mainly adopts magnetic transmission technology, which realizes contactless transmission of force or torque through the magnetic force generated by permanent magnetic materials or electromagnets. When the external power source drives the outer magnetic rotor to rotate, the magnetic field can penetrate the air gap and the isolation sleeve, driving the inner magnetic rotor connected to the impeller to rotate synchronously, realizing contactless transmission of power.

[0003] In existing compressor technology, especially oil-free compressors, the drive shaft is a core component, and its sealing and stability have a crucial impact on the overall performance of the compressor. Traditional drive shaft designs often use mechanical seal structures, but during long-term operation, due to friction, wear and vibration, the seals are easily damaged, resulting in medium leakage, affecting the normal operation of the compressor, and may cause environmental pollution. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a magnetic drive shaft for an oil-free compressor with a static sealing structure, which has good sealing performance during operation, reduces the damage of the traditional drive shaft to the seal, and prolongs the service life of the equipment.

[0005] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a magnetic drive shaft for an oil-free compressor with a static sealing structure is proposed, comprising a shaft sleeve, a protective sleeve and a positioning mechanism, wherein the protective sleeve is arranged in the shaft sleeve, and the driving shaft body is rotatably arranged in the protective sleeve; a sealing groove is opened on the side wall of one end of the shaft sleeve, a sealing ring is arranged on the side of the protective sleeve facing the side wall of the shaft sleeve, and a first sealing ring is arranged between the sealing ring and the sealing groove; a positioning groove is arranged on the outer wall of the protective sleeve; the positioning mechanism comprises a positioning sleeve, a positioning ring is arranged on the side wall of the positioning sleeve, the positioning ring is arranged in the positioning groove, and a second sealing ring is arranged between the outer peripheral wall of the positioning ring and the inner wall of the positioning groove; the positioning sleeve is fixedly connected to the shaft sleeve.

[0006] As a further solution of the utility model: a first mounting ring is arranged on the shaft sleeve, a second mounting ring is arranged on the positioning sleeve, and the first mounting ring is connected to the second mounting ring by bolts.

[0007] As a further solution of the utility model: an elastic groove is arranged between the second mounting ring and the positioning ring, the side wall of the protective sleeve is arranged in the elastic groove, and a spring is arranged in the elastic groove.

[0008] As a further solution of the utility model: a third sealing ring is arranged on the outer peripheral wall of the protective sleeve, and the third sealing ring is arranged on the inner wall of the other end of the shaft sleeve.

[0009] As a further solution of the utility model: one end of the shaft sleeve close to the third sealing ring is connected to the bearing seat of the oil-free compressor.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. The utility model protects the driving shaft body by setting a protective sleeve, and at the same time, the sealing groove cooperates with the sealing ring on the protective sleeve, and the first sealing ring is placed between the two, forming a first static seal. The protective sleeve is positioned by a positioning ring to maintain the stability of the installation of the protective sleeve, and at the same time, a second sealing ring is set between the positioning ring and the protective sleeve to form a second static seal. While sealing, it can effectively reduce the damage of the driving shaft body to the seal when it rotates, and improve the sealing of the overall device.

[0012] 2. The utility model improves the positioning effect of the positioning ring on the protective sleeve and the stability of the installation of the protective sleeve by bolting the first mounting ring and the second mounting ring, and at the same time improves the sealing of the overall device when the drive shaft body is in operation, thereby extending the service life of the equipment.

[0013] 3. The utility model provides an elastic space when the positioning sleeve positions the protective sleeve by arranging the elastic groove and the spring, so that the side wall of the protective sleeve can have a certain buffering effect when subjected to pressure or vibration, thereby protecting the sealing structure from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of a magnetic drive shaft for an oil-free compressor with a static sealing structure.

[0015] Figure 2 The present invention is an internal cross-sectional view of a magnetic drive shaft for an oil-free compressor having a static sealing structure.

[0016] Figure 3 This is a diagram for installing the protective cover.

[0017] Figure 4 This is a schematic diagram of the positioning sleeve installation.

[0018] The reference numerals in the figure are: 1. sleeve; 11. sealing groove; 12. first sealing ring; 2. protective sleeve; 21. sealing ring; 22. positioning groove; 23. driving shaft body; 3. positioning sleeve; 31. positioning ring; 32. second sealing ring; 4. first mounting ring; 5. second mounting ring; 51. elastic groove; 52. spring; 6. third sealing ring. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figures 1 to 4 As shown, a magnetic drive shaft for an oil-free compressor with a static seal structure includes a shaft sleeve 1, a protective sleeve 2 and a positioning mechanism. The protective sleeve 2 is arranged in the shaft sleeve 1, and a drive shaft body 23 is rotatably arranged in the protective sleeve 2. The magnetic drive shaft adopts magnetic transmission technology, and realizes contactless transmission of force or torque power through the magnetic force generated by permanent magnetic materials or electromagnets. When an external power source such as an electric motor drives the external magnetic rotor to rotate, the magnetic field can penetrate the air gap and the isolation sleeve, driving the internal magnetic rotor connected to the impeller to rotate synchronously, thereby realizing contactless transmission of power.

[0021] A sealing groove 11 is provided on the side wall of one end of the sleeve 1, a sealing ring 21 is provided on the side of the protective sleeve 2 facing the side wall of the sleeve 1, and a first sealing ring 12 is provided between the sealing ring 21 and the sealing groove 11; a positioning groove 22 is provided on the outer wall of the protective sleeve 2; the positioning mechanism includes a positioning sleeve 3, a positioning ring 31 is provided on the side wall of the positioning sleeve 3, the positioning ring 31 is arranged in the positioning groove 22, and a second sealing ring 32 is provided between the outer peripheral wall of the positioning ring 31 and the inner wall of the positioning groove 22; the positioning sleeve 3 is fixedly connected to the sleeve 1.

[0022] The protective sleeve 2 is provided to protect the driving shaft body 23, and the sealing groove 11 cooperates with the sealing ring 21 on the protective sleeve 2, and the first sealing ring 12 is placed between the two, forming a first static seal. The protective sleeve 2 is positioned by the positioning ring 31 to maintain the stability of the installation of the protective sleeve 2, and the second sealing ring 32 is provided between the positioning ring 31 and the protective sleeve 2 to form a second static seal, which can effectively reduce the damage to the seal when the driving shaft body 23 rotates, and improve the sealing performance of the overall device.

[0023] The shaft sleeve 1 is provided with a first mounting ring 4 , the positioning sleeve 3 is provided with a second mounting ring 5 , and the first mounting ring 4 is connected to the second mounting ring 5 with bolts.

[0024] The bolt connection between the first mounting ring 4 and the second mounting ring 5 improves the positioning effect of the positioning sleeve 3 on the protective sleeve 2, improves the stability of the installation of the protective sleeve 2, and at the same time improves the sealing of the entire device when the drive shaft body 23 is in operation, thereby extending the service life of the equipment.

[0025] An elastic groove 51 is disposed between the second mounting ring 5 and the positioning ring 31 , the side wall of the protective sleeve 2 is disposed in the elastic groove 51 , and a spring 52 is disposed in the elastic groove 51 .

[0026] By providing the elastic groove 51 and the spring 52, an elastic space is provided when the positioning sleeve 3 positions the protective sleeve 2, so that the side wall of the protective sleeve 2 can have a certain buffering effect when subjected to pressure or vibration, thereby protecting the sealing structure from being damaged.

[0027] A third sealing ring 6 is arranged on the outer peripheral wall of the protective sleeve 2 , and the third sealing ring 6 is arranged on the inner wall of the other end of the shaft sleeve 1 .

[0028] The third sealing ring 6 is provided to further enhance the sealing performance between the protective sleeve 2 and the shaft sleeve 1 .

[0029] One end of the shaft sleeve 1 close to the third sealing ring 6 is connected to the bearing seat of the oil-free compressor.

[0030] Working principle of the utility model: The magnetic drive shaft is mainly composed of a sleeve 1, a protective sleeve 2 and a positioning mechanism, and uses magnetic transmission technology to achieve contactless power transmission. When an external power source such as an electric motor is started, it drives the outer magnetic rotor to rotate, and the generated magnetic field penetrates the air gap and the isolation sleeve, thereby driving the inner magnetic rotor connected to the impeller to rotate synchronously. The protective sleeve 2 is arranged in the sleeve 1 to protect the drive shaft body 23, and the first static seal is formed by the sealing groove 11 and the sealing ring 21 in cooperation with the first sealing ring 12 to ensure that the medium does not leak.

[0031] The positioning ring 31 in the positioning mechanism is embedded in the positioning groove 22 on the outer wall of the protective sleeve 2, and the second sealing ring 32 between the outer peripheral wall of the positioning ring 31 and the inner wall of the positioning groove 22 is used to achieve a second static seal, while enhancing the stability of the installation of the protective sleeve 2. The first mounting ring 4 and the second mounting ring 5 are connected by bolts to further improve the stability of the installation of the protective sleeve 2 and the sealing of the overall device.

[0032] An elastic groove 51 and a spring 52 are provided between the positioning ring 31 and the second mounting ring 5 to provide a buffer space for the side wall of the protective sleeve 2 to reduce damage to the sealing structure caused by vibration or pressure changes. A third sealing ring 6 is also provided on the outer peripheral wall of the protective sleeve 2 to further increase the sealing performance with the shaft sleeve 1.

[0033] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A magnetic drive shaft for an oil-free compressor with a static sealing structure, comprising a shaft sleeve (1), a protective sleeve (2) and a positioning mechanism, wherein the protective sleeve (2) is arranged in the shaft sleeve (1), and a drive shaft body (23) is rotatably arranged in the protective sleeve (2); It is characterized in that A sealing groove (11) is provided on the side wall of one end of the shaft sleeve (1); a sealing ring (21) is provided on the side of the protective sleeve (2) facing the side wall of the shaft sleeve (1); a first sealing ring (12) is provided between the sealing ring (21) and the sealing groove (11); and a positioning groove (22) is provided on the outer side wall of the protective sleeve (2); The positioning mechanism comprises a positioning sleeve (3), a positioning ring (31) is arranged on the side wall of the positioning sleeve (3), the positioning ring (31) is arranged in the positioning groove (22), and a second sealing ring (32) is arranged between the outer peripheral wall of the positioning ring (31) and the inner wall of the positioning groove (22); the positioning sleeve (3) is fixedly connected to the shaft sleeve (1).

2. The magnetic drive shaft for an oil-free compressor with a static seal structure according to claim 1, characterized in that: The shaft sleeve (1) is provided with a first mounting ring (4), the positioning sleeve (3) is provided with a second mounting ring (5), and the first mounting ring (4) and the second mounting ring (5) are connected by bolts.

3. The magnetic drive shaft for an oil-free compressor with a static seal structure according to claim 2, characterized in that: An elastic groove (51) is provided between the second mounting ring (5) and the positioning ring (31), the side wall of the protective sleeve (2) is arranged in the elastic groove (51), and a spring (52) is arranged in the elastic groove (51).

4. The magnetic drive shaft for an oil-free compressor with a static seal structure according to claim 1, characterized in that: A third sealing ring (6) is arranged on the outer peripheral wall of the protective sleeve (2), and the third sealing ring (6) is arranged on the inner wall of the other end of the shaft sleeve (1).

5. The magnetic drive shaft for an oil-free compressor with a static seal structure according to claim 4, characterized in that: One end of the shaft sleeve (1) close to the third sealing ring (6) is connected to the bearing seat of the oil-free compressor.

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