Bearing cooling adjustable single-screw oil-free compressor

Abstract

The single-screw oil-free compressor mainly comprises a barrel-shaped machine body, a screw front bearing seat assembly, a screw rear bearing seat assembly and a screw transmission mechanism, a first bearing and a second bearing are embedded in a front bearing seat and a rear bearing seat respectively, annular water grooves are formed in inner cavities of the screw front bearing seat and the screw rear bearing seat, and cooling water from a heat exchanger is cooled through the annular water grooves. High temperature generated by bearing operation can be taken away through the water tank, the phenomena of high-temperature loss and coking of lubricating grease are eliminated, the service life of the bearing and the service life of a machine are prolonged, and the operation temperature of the bearing can be automatically adjusted through the PLC. Efficient sealing and cooling can be achieved, and the service life of the bearing and the service life of the compressor are prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of general mechanical compressors, and particularly relates to a single-screw oil-free compressor with adjustable bearing cooling. Background Art

[0002] Single-screw oil-free compressors are widely used in industries such as chemical industry, pharmaceuticals, medical treatment, food, electronics, textiles, spraying, biochemistry, photovoltaic, new energy vehicles, military, and scientific research, which require pure air and process gases. Compared with piston-type oil-free compressors and twin-screw dry oil-free compressors, single-screw water-lubricated oil-free compressors have the advantages of simple structure, reliable operation, low noise, low energy consumption, low maintenance cost, and no pollution.

[0003] However, in the existing single-screw oil-free compressor, the compression chamber is separated from the support bearing by a mechanical seal, and its bearing does not allow water or other liquids to enter. Therefore, only grease lubrication can be selected. Since the bearing cannot be sufficiently cooled by water or other liquids, and the screw bearing operates at a high speed of 3000 revolutions per minute, and the bearing housing of the support bearing is a 304 stainless steel casting with a very thick wall thickness and is not easy to dissipate heat, the bearing is prone to high temperature, resulting in the loss and coking of the lubricating grease, seriously affecting the service life of the bearing and the normal operation of the machine. Summary of the Invention

[0004] Object of the Invention: Aiming at the defects and technical problems in the background art, the present invention provides a single-screw oil-free compressor with adjustable bearing cooling, which can achieve efficient sealing and cooling, and improve the service life of the bearing and the compressor.

[0005] Technical Solution: To achieve the above object of the invention, the present invention adopts the following technical solutions: A single-screw oil-free compressor with adjustable bearing cooling, comprising a cylindrical body, a screw, a front bearing housing and a rear bearing housing respectively arranged at both ends of the body, and a cooling mechanism. The screw comprises a main shaft and a turbine sleeved on the main shaft; A first bearing and a second bearing are respectively nested in the front bearing housing and the rear bearing housing, and both ends of the screw are respectively movably arranged in the first bearing and the second bearing; annular grooves, a liquid inlet channel and a liquid outlet channel communicated with the annular groove are respectively arranged in the front bearing housing and the rear bearing housing, and pipe joints are also arranged on the liquid inlet channel and the liquid outlet channel; the cooling mechanism is connected with the pipe joint through a pipeline to form a cooling cycle; A front oil seal assembly and a rear oil seal assembly are respectively arranged between the front bearing housing and the rear bearing housing and the main shaft of the screw, The front oil seal assembly comprises a front mechanical seal seat fixed on the inner side of the front bearing housing, a front bearing cover fixed on the outer side of the front bearing housing. A first mechanical seal is also arranged between the front mechanical seal seat and the main shaft, and a front sealing retaining ring is also arranged on the main shaft between the front mechanical seal seat and the first bearing; The rear oil seal assembly includes a rear mechanical seal seat fixed to the inner side of the rear bearing seat, a rear bearing gland fixed to the outer side of the rear bearing seat. A rear bearing cover is further provided on the rear bearing seat opposite to the inner side of the rear mechanical seal seat. A rear seal retaining ring is further provided between the inner ring of the rear bearing cover and the main shaft. A gap is provided between the rear mechanical seal seat and the rear bearing cover (which can effectively improve the fluidity of the liquid oil and enhance the lubrication and heat dissipation effects).

[0006] Preferably, the cooling mechanism includes a heat exchanger. The liquid outlet of the heat exchanger is connected to the pipe joint of the liquid inlet passage through a pipeline. The pipe joint of the liquid outlet pipeline is connected to the liquid inlet of the heat exchanger through a pipeline. A regulating valve, a pressure sensor, and a temperature sensor are further provided on the pipeline.

[0007] Preferably, the heat exchanger is a plate heat exchanger or an air-cooled radiator. The air-cooled radiator is further equipped with a cooling fan.

[0008] Preferably, the annular groove is provided with through holes or notches for circulating the coolant and communicating with the bearing.

[0009] Preferably, the first bearing and the second bearing respectively adopt a cylindrical roller bearing and a double-row angular contact bearing.

[0010] Preferably, the front mechanical seal seat includes a shaft cylinder and a connection end provided at the end of the shaft cylinder. The connection end is a connection ring that fits tightly with the front bearing seat. A first mechanical seal is further provided between the shaft cylinder and the main shaft.

[0011] Preferably, a skeleton oil seal is further provided between the front bearing cover and the main shaft.

[0012] Preferably, a second mechanical seal is further provided between the rear mechanical seal seat and the main shaft.

[0013] Beneficial effects: Compared with the prior art, the present invention provides an annular cooling channel in the hole of the bearing seat, which directly takes away the high temperature generated during the operation of the bearing; and the direct cooling through the through holes or notches between the annular groove and the bearing improves the cooling effect, solves the problems that the lubricating grease of the bearing is prone to high-temperature loss and coking, improves the service life of the bearing, and enables the machine to adapt to the working conditions of long-term continuous operation, such as the textile, chemical, and petroleum industries. Brief Description of the Drawings

[0014] Figure 1 is the external shape structure diagram of the single-screw oil-free compressor with adjustable bearing cooling according to the present invention.

[0015] Figure 2 is Figure 1 the cross-sectional view in the A-A direction of

[0016] Figure 3 is the structural schematic diagram of Embodiment 1 of the present invention.

[0017] Figure 4 This is the structural schematic diagram of Embodiment 2 of the present invention.

[0018] Among them, 1. Front bearing housing, 2. Front mechanical seal housing, 3. First mechanical seal, 4. Cylindrical roller bearing, 5. Screw shaft, 6. Front seal retaining ring, 7. Skeleton oil seal, 8. Front bearing cover, 9. Machine body, 10. Screw body, 11. Second mechanical seal, 12. Rear mechanical seal housing, 13. Rear bearing cover, 14. Rear seal retaining ring, 15. Double-row angular contact bearing, 16. Rear bearing housing, 17. Water pipe joint, 18. Rear bearing gland, 19. Round nut, 20. Bolt, 105. Plate heat exchanger, 106. Water flow regulating valve, 107. Pressure sensor, 108. Temperature sensor, 109. Air-cooled radiator, 110. Cooling fan. Detailed implementation manners

[0019] The present invention will be further clarified below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications made by those skilled in the art to the present invention fall within the scope defined by the appended claims of this application. Embodiment

[0020] As Figures 1-3 shown, the single-screw oil-free compressor with adjustable bearing cooling of the present invention includes a cylindrical machine body, a screw, a front bearing housing and a rear bearing housing respectively arranged at both ends of the machine body, and a cooling mechanism. Among them: The screw includes a main shaft and a turbine sleeved on the main shaft. The main shaft of the screw is installed on the front bearing housing and the rear bearing housing through the inner edges of the bearings at both ends. The screw body is heated and press-fitted onto the screw. The left end of the screw body is equipped with a dynamic ring of the mechanical seal. The front and rear seal retaining rings are installed at both ends for axial positioning, and both ends of the screw shaft are locked with nuts.

[0021] The first bearing and the second bearing are respectively nested in the front bearing housing and the rear bearing housing, and both ends of the screw are respectively movably arranged in the first bearing and the second bearing; an annular groove, a liquid inlet channel and a liquid outlet channel communicating with the annular groove are respectively arranged in the front bearing housing and the rear bearing housing, and a pipe joint is also arranged on the liquid inlet channel and the liquid outlet channel. The front bearing housing is provided with an annular water tank. The external cooling water flows into the water tank through radial and axial holes from hole A and flows out from hole B, as Figure 2 shown. The front bearing housing is fixed to the machine body by 6 screws, the rear bearing is fixed to the right end face of the machine body by 8 screws, the outer ring of the double-row angular contact bearing is installed in the hole of the rear bearing housing, the cooling annular groove in the hole of the rear bearing housing is distributed on the outer circle of the bearing, and both ends of the bearing are positioned by tightening the rear bearing cover and the rear bearing gland with bolts.

[0022] In the present invention, the second bearing preferably adopts a double-row angular contact bearing with stronger axial and radial loads, which can ensure the working stability of the compressor. The first bearing preferably adopts a cylindrical roller bearing, which is mainly used to reduce the vibration interference caused by the radial offset of the main shaft. Therefore, the present invention preferably combines the front and rear bearings to ensure the matching of the shaft radial load requirements, so as to ensure the smooth operation of the compressor and reduce vibration interference.

[0023] In addition, the front oil seal assembly and the rear oil seal assembly are respectively provided between the front bearing seat and the rear bearing seat and the main shaft of the screw, wherein: the front oil seal assembly includes a front machine seal seat fixedly arranged on the inner side of the front bearing seat, a front bearing cover fixedly arranged on the outer side of the front bearing seat, a first machine seal is also provided between the front machine seal seat and the main shaft, and a front sealing retainer ring is also provided on the main shaft between the front machine seal seat and the first bearing. The rear oil seal assembly includes a rear machine seal seat fixedly arranged on the inner side of the rear bearing seat, a rear bearing pressure cover fixedly arranged on the outer side of the rear bearing seat, a rear bearing cover is also provided on the rear bearing seat on the inner side of the rear machine seal seat, and a rear sealing retainer ring is also provided between the inner ring of the rear bearing cover and the main shaft. A gap is provided between the rear machine seal seat and the rear bearing cover, and the fluidity and cooling effect of the cooling lubricant are improved by the liquid flow pressure in the bearing.

[0024] like Figure 3 As shown, an annular water groove is set in the inner hole of the front bearing seat 1 and the rear bearing seat 16. The water groove is close to the outer circle of the bearing. Cooling water is introduced from the water-cooled compressor plate heat exchanger 105 or the air-cooled compressor air-cooled radiator 106. The cooling water passes through the water volume regulating valve 108 and flows into the annular grooves of the front and rear bearing seats from the A port of the front bearing seat 1 and the C port of the rear bearing seat 16. Due to the heat exchange effect, the cooling water takes away a part of the heat of the bearing and flows into the cooling water outlet of the plate heat exchanger 105 or the air-cooled radiator 106 from the B port of the front bearing seat 1 and the D port of the rear bearing seat 16. Temperature sensors 110 and pressure sensors 109 are installed at the B and D ends of the cooling water. The bearing operating temperature can be detected by the programmable controller PLC, and the water volume can be adjusted by the water volume regulating valve 108 to control the bearing temperature. Example

[0025] like Figure 4 As shown, the core component of the cooling mechanism of the present invention uses an air-cooled radiator instead of a plate heat exchanger, and is equipped with a cooling fan to utilize a natural cooling source. As a preferred solution, the configuration of the air-cooled radiator and the cooling fan can be replaced by a buried cooling heat pipe as an indirect cooling source.

[0026] The above embodiments are only illustrative of the principles and effects of the present application and are not intended to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A single screw oil-free compressor with adjustable bearing cooling, characterized in that: It includes a cylindrical body, a screw, a front bearing seat and a rear bearing seat respectively arranged at both ends of the body, and a cooling mechanism, wherein the screw includes a main shaft and a turbine sleeved on the main shaft; The front bearing seat and the rear bearing seat are respectively embedded with a first bearing and a second bearing, and the two ends of the screw are respectively movably arranged in the first bearing and the second bearing; the front bearing seat and the rear bearing seat are respectively provided with an annular groove and a liquid inlet channel and a liquid outlet channel connected with the annular groove, and the liquid inlet channel and the liquid outlet channel are also provided with pipe joints; the cooling mechanism is connected with the pipe joint through a pipeline to form a cooling cycle; A front oil seal assembly and a rear oil seal assembly are respectively provided between the front bearing seat and the rear bearing seat and the main shaft of the screw. The front oil seal assembly comprises a front machine seal seat fixedly arranged on the inner side of the front bearing seat, a front bearing cover fixedly arranged on the outer side of the front bearing seat, a first machine seal is also arranged between the front machine seal seat and the main shaft, and a front sealing retaining ring is also arranged on the main shaft between the front machine seal seat and the first bearing; The rear oil seal assembly includes a rear machine seal seat fixedly mounted on the inner side of the rear bearing seat, a rear bearing pressure cover fixedly mounted on the outer side of the rear bearing seat, a rear bearing cover is also provided on the rear bearing seat on the inner side of the rear machine seal seat, a rear sealing retaining ring is also provided between the inner ring of the rear bearing cover and the main shaft; a gap is provided between the rear machine seal seat and the rear bearing cover.

2. The single-screw oil-free compressor with adjustable bearing cooling according to claim 1, characterized in that: The cooling mechanism includes a heat exchanger, the liquid outlet of the heat exchanger is connected to the pipe joint of the liquid inlet channel through a pipeline, the pipe joint of the liquid outlet pipeline is connected to the liquid inlet of the heat exchanger through a pipeline, and the pipeline is also provided with a regulating valve, a pressure sensor, and a temperature sensor.

3. The single-screw oil-free compressor with adjustable bearing cooling according to claim 2, characterized in that: The heat exchanger is a plate heat exchanger or an air-cooled radiator, and the air-cooled radiator is also matched with a cooling fan.

4. The single-screw oil-free compressor with adjustable bearing cooling according to claim 1, characterized in that: The annular groove is provided with a through hole or a slot which is communicated with the bearing and is used for circulating the cooling liquid.

5. The single-screw oil-free compressor with adjustable bearing cooling according to claim 1, characterized in that: The first bearing and the second bearing are cylindrical roller bearings and double-row angular contact bearings respectively.

6. The single-screw oil-free compressor with adjustable bearing cooling according to claim 1, characterized in that: The front machine seal seat includes a shaft cylinder and a connecting end arranged at the end of the shaft cylinder, the connecting end is a connecting ring that fits tightly with the front bearing seat, and a first machine seal is also arranged between the shaft cylinder and the main shaft.

7. The single-screw oil-free compressor with adjustable bearing cooling according to claim 1, characterized in that: A skeleton oil seal is also provided between the front bearing cover and the main shaft.

8. The single-screw oil-free compressor with adjustable bearing cooling according to claim 1, characterized in that: A second machine seal is also provided between the rear machine seal seat and the main shaft.

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