CN111271283A

CN111271283A - Shaft seal-free water-lubricated single-screw oil-free compressor for balancing pressure by using screw hole

Info

Publication number: CN111271283A
Application number: CN202010133304.0A
Authority: CN
Inventors: 邵凯
Original assignee: 邵凯
Priority date: 2020-03-01
Filing date: 2020-03-01
Publication date: 2020-06-12

Abstract

The invention discloses a shaft-seal-free water-lubricated single-screw oil-free compressor with a screw hole for pressure balance, which mainly comprises a machine body, a screw transmission mechanism and a star wheel transmission mechanism, and further comprises a bearing waterproof sealing-free device and a fluid pressure balance pressure relief flow guide type working principle and method, wherein the traditional mechanical sealing is cancelled, and the problems of leakage and wearing parts replacement of the compressor caused by sealing are thoroughly solved. Because of no sealing, no leakage and high reliability, the device is particularly suitable for industries requiring continuous work, such as petrifaction, textile, pharmacy, medical treatment and the like. The invention can provide 100% pure compressed air or process gas, and replace oil with municipal tap water, with zero discharge, no pollution, low energy consumption, low maintenance cost, high reliability and high cost performance, and is a new energy-saving and environment-friendly green product.

Description

Shaft seal-free water-lubricated single-screw oil-free compressor for balancing pressure by using screw hole

Technical Field

The invention belongs to a water-lubricated single-screw oil-free compressor in general machinery and chemical machinery compressor products, which can compress various chemical process gases such as air, oil gas, natural gas, carbon dioxide, nitrogen dioxide, coal bed gas, biomass methane, coal mine gas, oil field gas, nitrogen, argon, oxygen, hydrogen, acetone and the like and air-conditioning refrigerants and can be used as various gas expanders such as steam and the like.

Background

The water-lubricated single-screw oil-free compressor is mainly divided into two categories, namely an oil-free air compressor and an oil-free process compressor, and is mainly applied to industries requiring pure air and process gas, such as petroleum, chemical engineering, pharmacy, food, medical treatment, electronics, textile, air separation, water treatment, spraying, environmental protection, bioengineering, nuclear power plants, submarines, fuel cell automobiles, aerospace, aviation, military industry, scientific research and the like. Because water is used as a cooling and lubricating medium, the compressor has low temperature and no ignition point, and can be used in the industry of compressing explosive and flammable special gases.

Compared with piston and double-screw dry-type oil-free compressors, the water-lubricated single-screw oil-free compressor has the advantages of simple structure, low noise, low energy consumption, small bearing stress, long service life, low operating temperature, no environmental pollution, low maintenance cost, high cost performance and the like, and has obvious technical performance and price advantages compared with piston and double-screw oil-free compressors.

In order to prevent compressed gas and media from flowing into a bearing rotating at a high speed, various oil-free compressors produced at home and abroad at present are provided with one or more sealing devices such as mechanical seals, carbon ring seals and the like between a compression cavity and a bearing chamber, as shown in figures 2 and 3, because a moving ring and a static ring made of graphite or silicon carbide are adopted, the moving ring and the static ring move relatively at a high speed in a friction mode, energy is consumed, heat is generated, abrasion is generated after the moving ring and the static ring rotate for a certain time, and the service life is generally about 8000 hours. When the machine finds that the fluid leakage occurs during operation, the quick-wear parts of the moving ring and the static ring need to be replaced immediately, which causes certain influence and loss on production due to machine halt in the continuous operation chemical industry, petroleum industry and textile industry.

The mechanical seal or carbon ring seal of the screw shaft and the star wheel shaft of the compressor needs to be replaced by detaching the machine head and sending the machine head to a manufacturer or a professional maintenance department, so that the transportation cost and the replacement cost increase the maintenance cost of the machine, and the time period is long.

The sealing device of the oil-free screw compressor, such as a mechanical seal or a carbon ring seal, particularly has high cost for manufacturing and maintaining a high-power and large-flow compressor main machine, and has high manufacturing technical requirements, such as overlarge contact pressure of a moving ring and a static ring, high machine operation temperature and accelerated abrasion can be caused, and leakage of machine fluid can be caused if the contact pressure of the moving ring and the static ring is too small, which is a technical problem difficult to solve in the field of compressors.

Disclosure of Invention

In order to solve the technical problems, long-term theoretical analysis and experiments prove that the invention provides and develops a shaft-seal-free water-lubricated single-screw oil-free compressor with a screw hole for balancing pressure.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the single-screw oil-free compressor is lubricated by using shaft seal-free water with a screw hole for pressure balance, and the working principle of the pressure relief diversion type shaft seal-free compressor is as follows: and a plurality of small holes are drilled in the end surface of the screw 6A in a circumferential array manner, so that the high-pressure cavity 9A on the right side of the screw 6A is communicated with the low-pressure cavity 4A on the left side of the screw. When the compressor works, the high-pressure water-gas mixed fluid P leaked from the fit clearance between the screw at the end of the high-pressure cavity 9A and the machine body 8A flows to the low-pressure cavity 4A at the air suction end on the left side of the screw along a plurality of small holes, and the low-pressure cavity 4A is under negative pressure, so that the water-gas mixed fluid P cannot flow to the rear bearing 12A on the right side of the screw shaft 5A. With the end of the gas compression process, most high-pressure fluid is discharged from a triangular hole of the box body corresponding to the tail end of the screw groove, the space between the screw 6A and the meshing teeth of the star wheel is gradually increased in the air suction process, partial vacuum is formed, and at the moment, the mixed fluid G of air or process gas and water entering from the air inlet and the mixed fluid P entering from a plurality of axial small holes on the right end face of the screw 6A are simultaneously sucked and supplemented into the tooth grooves of the screw cavity. The low pressure chamber 4A is now at a negative pressure, i.e. lower than the atmospheric pressure outside the left side, so that fluid does not flow to the front bearing 1A on the left side either. The method for pressure relief and flow guide of the fluid at the high-pressure end to the low-pressure end can prevent the water-gas fluid from flowing to the bearings at the two ends of the screw shaft 5A, thereby canceling mechanical seal or carbon ring seal, fundamentally solving the leakage problem of the compressed fluid, and changing the traditional passive leak-proof sealing method into an active pressure relief and flow guide sealing method, i.e. no seal and no leakage.

The single-screw oil-free compressor with no shaft seal and water lubrication for balancing pressure by using the screw hole mainly comprises a machine body assembly, a screw front bearing assembly, a screw rear bearing assembly, a screw transmission mechanism and two groups of star wheel transmission mechanisms which are arranged on the upper portion and the lower portion of the screw transmission mechanism and are vertically symmetrical to the center of the screw.

The machine body component mainly comprises a motor connecting seat and a machine body. The upper part of the machine body is provided with a square air inlet connected with an air inlet valve and an air filter or a process gas filter and a water-gas mixed fluid exhaust hole connected with a one-way valve. Two water spraying ports are respectively arranged on two sides of the machine body and at the central position of the screw rod. The cylindrical hole in the middle of the machine body is in clearance fit with the screw, and a set of star wheel transmission mechanism is respectively arranged in the vertical direction of the machine body. The right side of the machine body is provided with a screw front bearing seat assembly, the left side of the machine body is provided with a screw rear bearing seat assembly, and the upper side and the lower side of the machine body are respectively provided with an openable side cover.

The screw rod front bearing block assembly mainly comprises a screw rod front bearing block 3 and a cylindrical roller bearing 5. Two labyrinth end face ring grooves are arranged on the left end face of the screw front bearing seat, when the screw shaft rotates, the labyrinth end face ring grooves are in clearance fit with the labyrinth ring of the screw front water throwing ring fixed on the screw shaft, and 4 water draining holes are drilled in the radial direction and the axial direction of the screw front bearing seat respectively.

The cylindrical roller bearing is arranged in a bearing seat hole in the front of the screw rod and is axially positioned by a retainer ring through a step in a right hole and a left hole. The screw rod front bearing seat is connected with the motor connecting seat through 6 screws.

The screw rear bearing seat assembly comprises a screw rear bearing seat, an angular contact bearing and a bearing gland.

The screw rod rear bearing seat assembly is fixed on the right end face of the machine body through 8 screws, and an angular contact bearing of the screw rod rear bearing seat assembly is arranged in a hole of the rear bearing seat. The left surface of the bearing outer ring is positioned by the step surface of the rear bearing seat hole, and the right surface is pressed and positioned by the bearing gland. Two labyrinth ring grooves are arranged at the left end of the screw rear bearing seat, when the screw shaft rotates, the labyrinth ring is in clearance fit with the labyrinth ring of the screw rear water slinging ring fixed on the screw shaft, and 4 water drainage holes are arranged in the radial direction and the axial direction of the rear screw seat.

The screw transmission mechanism comprises a screw, a screw shaft, a flat key, a front screw water throwing ring, a locking nut, a rear screw water throwing ring and a bearing retainer ring.

The excircle of the screw is provided with 6 spatial spiral grooves which are precisely matched with the star wheel sheet, namely 6 cylinders are precisely matched with the piston. The end surface of the screw is drilled with a plurality of small holes which are axially communicated.

The screw transmission mechanism is supported on bearings at two ends through a screw front bearing seat and a screw rear bearing seat. The screw rod is fixed on the screw rod shaft through a flat key, a front water throwing ring and a cylindrical roller bearing are sequentially arranged on the outer circle of the left side of the screw rod shaft, and a locking nut is used for pressing the left end face of the screw rod. The rear bearing water slinging ring and the angular contact bearing are sequentially arranged on the right excircle of the screw shaft and are pressed on the right end surface of the screw by a bearing retainer ring and a screw. The left end of the screw shaft extends outwards to be connected with the motor shaft through the claw-shaped coupler, and the power of the motor is transmitted to the screw to drive the star wheel sheet to rotate.

The star wheel transmission mechanism comprises a star wheel small end cover part, a star wheel large end cover part and a star wheel shaft part.

The star wheel small end cover component comprises a star wheel small end cover, a star wheel small end pressing sleeve, a deep groove ball bearing, a star wheel small end supporting seat, a star wheel small end bearing gasket, a wave-shaped gasket and a star wheel small end supporting seat.

The star wheel small end cover hole is internally provided with a deep groove ball bearing, the right end of a bearing outer ring passes through a waveform gasket, a star wheel small end bearing gasket and the star wheel small end cover hole are positioned on a step surface, the left end of the bearing outer ring is pressed and positioned through a star wheel small end pressing sleeve and a supporting screw on a star wheel small end supporting seat, and the bearing can perform small elastic movement in the axial direction due to the adoption of the waveform gasket.

The left end of the star wheel small end cover is provided with a labyrinth ring groove, and a certain movement fit clearance is kept between the labyrinth ring groove and a moving ring of a star wheel small end cover water throwing ring fixed on a star wheel shaft when the star wheel shaft rotates. 4 drain holes are drilled in the radial direction and the axial direction of the star wheel small end cover respectively.

The star wheel small end cover component is fixed on the machine body through 4 screws.

The star wheel large end cover component comprises a star wheel large end cover, a double-row angular contact bearing, a star wheel large end bearing retainer ring, a star wheel large end supporting seat, a star wheel large end bearing pressing sleeve, a star wheel large end bearing gasket and a disc spring.

The star wheel big end cover hole is internally provided with a double-row angular contact bearing, the left end of the bearing is positioned through a butterfly spring, a star wheel big end bearing gasket and the left step surface of the star wheel big end cover hole, and the right end of the outer ring of the bearing is pressed and positioned through a star wheel big end bearing pressing sleeve and a supporting screw on a star wheel big end supporting seat. Due to the adoption of the disc spring, the bearing can perform slight elastic movement in the axial direction.

A labyrinth ring groove is arranged on the left end face of the star wheel big end cover, a certain fit clearance is kept between the labyrinth ring groove and a star wheel big end water throwing ring fixed on a star wheel shaft when the star wheel shaft rotates, and 4 water draining holes are drilled in the radial direction and the axial direction of the star wheel big end cover.

The star wheel large end cover component is fixed on the machine body through 6 screws.

The star wheel shaft part comprises a star wheel shaft, a star wheel sheet, a star wheel pin elastic ring, a star wheel sheet check ring, a left spring seat, a spring, a right spring seat, a star wheel small-end water throwing ring, a star wheel small-end bearing spacer, a star wheel small-end bearing check ring, a star wheel large-end water throwing ring, a star wheel large-end bearing spacer and a star wheel large-end bearing check ring.

The star wheel sheet is arranged on the star wheel shaft and is radially positioned through the star wheel pin, and the left side of the star wheel sheet is always pressed on the left large end face of the star wheel shaft through an elastic unit consisting of a star wheel sheet retainer ring, a left spring seat, a spring and a right spring seat.

The star wheel shaft is provided with a star wheel big end water throwing ring, a star wheel big end bearing spacer bush and a double-row angular contact bearing inner ring in sequence in a sliding sleeve manner on the right end shaft diameter, and the star wheel big end retainer ring is pressed on the right end face of the star wheel shaft.

The star wheel shaft is characterized in that a star wheel small-end water throwing ring, a star wheel small-end bearing spacer bush and a deep groove ball bearing are sequentially installed on the shaft diameter of the left end of the star wheel shaft in a sliding way, and a star wheel small-end bearing retainer ring is pressed on the end face of the left side of the star wheel shaft.

The star wheel shaft assembly is supported by a double-row angular contact bearing arranged in a star wheel large end cover and a deep groove ball bearing arranged in a star wheel small end cover.

The star wheel shaft assemblies are provided with two sets, are symmetrical to the axis of the screw rod, and are vertically arranged in two sets of holes of the machine body through the star wheel large end cover assembly and the star wheel small end cover assembly.

Through the technical scheme, the invention has the beneficial effects that:

1. the principle of fluid pressure balance is applied, and a pressure relief flow guiding method is utilized to guide the leaked high-pressure fluid on the high-pressure side to flow to the negative pressure air inlet cavity on the low-pressure side. Fluid is prevented from flowing to the bearing, and the problems of sealing and leakage of the machine are fundamentally solved.

2. Because the waterproof and sealing problems of the bearing are solved, the machine can adapt to the working conditions of continuous work, such as petrochemical industry, textile industry, medical industry and military industry.

3. The machine has simple design structure and good manufacturing manufacturability, and only drills a plurality of holes on the end surface of the screw rod.

4. The heat and energy loss generated by friction in the relative motion of the mechanical seal and the carbon ring seal movable and static rings is avoided, the running temperature of the machine is reduced, and the energy consumption is saved.

5. The elimination of sealing devices, such as mechanical seals and carbon ring seals, reduces manufacturing costs and thus eliminates a significant source of leakage failure for the machine.

6. The machine has the advantages of no oil, zero emission, no environmental pollution, environmental protection, energy conservation, normal-temperature operation and low maintenance cost, and compared with piston type and double-screw dry type oil-free compressors, the technical indexes of reliability, noise, energy consumption, cost performance, vibration and the like have obvious advantages.

Drawings

In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings needed in the description of the embodiments or prior art are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.

FIG. 1 is a fluid pressure relief flow guiding type working schematic diagram of a shaftless water lubrication single-screw oil-free compressor for balancing pressure by using screw holes, which is disclosed by the embodiment of the invention

FIG. 2 is an assembly diagram of a screw driving mechanism of a conventional water-lubricated single-screw oil-free compressor

FIG. 3 is an assembly diagram of a star wheel transmission mechanism of a conventional water-lubricated single-screw oil-free compressor

FIG. 4 is the present invention; assembly front view of shaft seal-free water-lubricated single-screw oil-free compressor for balancing pressure by using screw hole

FIG. 5 is a sectional assembly view taken along the direction B-B in FIG. 4

FIG. 6 is a sectional assembly view taken along A-A of FIG. 4

FIG. 7 is the present invention; part newly designed for screw part of shaft-seal-free water-lubricated single-screw oil-free compressor with screw hole for balancing pressure

FIG. 8 is a view taken along the line A of FIG. 7

Names of corresponding parts represented by numerals and letters in the drawings

Shown in FIG. 1

1A-front bearing, 2A-front bearing seat water outlet, 3A-front bearing water throwing ring, 4A-low pressure cavity, 5A-screw shaft, 6A-screw, 7A-screw pressure relief flow guide hole, 8A-body, 9A-high pressure cavity, 10A-rear bearing water throwing ring, 11A-rear bearing seat water outlet, 12A-rear bearing

Shown in figures 2 and 3

1B-screw front bearing, 2B-screw front mechanical seal, 3B-screw, 4B-screw rear mechanical seal, 5B-screw front bearing, 6B-star wheel big end bearing, 7B-star wheel big end mechanical seal, 8B-star wheel shaft, 9B-star wheel small end mechanical seal, 10B-star wheel small end bearing

Shown in figures 5 and 6

1-motor connecting seat, 2-coupler, 3-screw rod front bearing seat, 4-lock nut, 5-cylindrical roller bearing, 6-screw rod front water throwing ring, 7-machine body, 8-screw rod, 9-screw rod shaft, 10-flat key, 11-screw rod rear water throwing ring, 12-screw rod rear bearing seat, 13-angular contact bearing, 14-bearing retainer ring, 15-bearing press cover, 16-star wheel small end cover, 17-star wheel small end bearing press sleeve, 18-deep groove ball bearing, 19-star wheel small end supporting seat, 20-star wheel small end bearing retainer ring, 21-star wheel small end bearing spacer, 22-wave-shaped gasket, 23-star wheel small end bearing washer, 24-star wheel small end water throwing ring, 25-left spring seat, spring seat, 26-spring, 27-right spring seat, 28-star wheel sheet retainer ring, 29-star wheel pin elastic ring, 30-star wheel pin, 31-star wheel sheet, 32-star wheel shaft, 33-star wheel large-end water throwing ring, 34-star wheel large-end bearing spacer sleeve, 35-star wheel large-end bearing gasket, 36-disc spring 37-star wheel large end cover, 38-double-row angular contact bearing, 39-star wheel large-end bearing retainer ring, 40-star wheel large-end supporting seat and 41-star wheel large-end bearing pressing sleeve

Shown in figures 7 and 8

A triangular exhaust groove at the tail end of the 1C-screw, a pressure relief diversion hole of the 2C-screw and a fluid inlet of the 3C-screw

Detailed Description

The technical solutions in the embodiments of the present invention will be fully described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All embodiments obtained by a person skilled in the art based on other embodiments of the invention without inventive step are within the scope of protection of the present invention.

The present invention will be described in further detail with reference to examples and specific embodiments.

Examples

As shown in fig. 1, the pressure relief flow-guiding type shaft seal-free working principle of the single-screw oil-free compressor is realized by using shaft seal-free water lubrication with a screw hole for pressure balancing; a plurality of small holes are axially drilled in a circumferential array on the end face of the screw 6A, so that a high-pressure fluid leakage cavity on the end face of the right side of the screw 6A is communicated with the low-pressure cavity 4A on the end face of the left side of the screw 6A. When the compressor exhausts, most of compressed high-pressure aqueous vapor fluid enters a triangular hole corresponding to a machine body 8A through a triangular groove at the tail end of a screw groove and is discharged into a water-vapor separator through a one-way valve, a small amount of aqueous vapor fluid P leaked from a fit gap between the outer circle of the screw 6A and the machine body 8A flows into a high-pressure cavity 9A formed between the right end surface of the screw 6A and the left end surface of a screw rear bearing seat, because a plurality of drilled small holes 7A on the screw 6A are communicated with a low-pressure cavity 4A at the left end of the screw 6A, and the low-pressure cavity 4A is under negative pressure in the processes of air suction and compression, the high-pressure aqueous vapor fluid P leaked at the right side tends to rapidly flow to the low-pressure cavity 4A at the left side along the axial direction of the screw 6A due to the pressure difference relationship, and never flows to a rear. When the compressor is loaded, the low-pressure chamber 4A is under negative pressure, and the fluid p flowing from the plurality of small holes 7A in the axial direction of the screw 6A to the low-pressure chamber 4A is only sucked into the cavity of the screw groove and does not flow to the front bearing 1A at the left end, and meanwhile, the mixed fluid G of air or process gas and water entering from the air inlet is also sucked into the cavity of the screw groove and does not flow to the front bearing 1A. When the compressor is unloaded, the negative pressure of the low-pressure cavity 4A is reduced because the air inlet valve is closed, in order to prevent a small amount of residual water in the machine body from flowing into the bearing, a front bearing water slinging ring 3A and a rear bearing water slinging ring 10A are respectively arranged on the rotating screw shaft 5A, and labyrinth annular grooves are arranged on the end surfaces of the front bearing seat and the rear bearing seat of the corresponding screw and are in clearance fit with the labyrinth annular grooves. The small amount of water thrown by the front and rear bearing water throwing rings can be discharged through a plurality of radial and axial

water drainage holes

2A and 11A of the front and rear bearing seats of the screw rod.

Examples

As shown in fig. 4, 5 and 6, the shaft seal-free water-lubricated single-screw oil-free compressor with the screw holes for pressure balancing mainly comprises a machine body assembly, a screw front bearing seat assembly, a screw rear bearing assembly, a screw transmission mechanism and a star wheel shaft transmission mechanism.

The machine body component mainly comprises a motor connecting seat 1 and a machine body 7. The screw front bearing seat assembly and the screw rear bearing seat assembly are respectively arranged at the front end and the rear end of a screw hole of the machine body 7 and are used for supporting the rotary motion of the screw transmission mechanism, and the upper star wheel hole and the lower star wheel hole which are vertically crossed with the screw hole of the machine body 7 are provided with a star wheel small end cover component and a star wheel large end cover component and are used for supporting the rotation of the star wheel shaft transmission mechanism. The motor connecting seat 1 is arranged on the left side of the machine body 7 through 8 screws.

The screw rod front bearing seat assembly comprises a screw rod front bearing seat 3 and a cylindrical roller bearing 5, wherein the cylindrical roller bearing 5 is arranged in a screw rod front bearing seat hole, the right side of a bearing outer ring is limited by the step surface of the screw rod front bearing seat 3, and the left side of the bearing outer ring is limited by a retainer ring for a hole. The inner ring of the bearing is limited by the screw rod front water throwing ring 6 and the locking nut 4. The screw rod front bearing seat assembly is fixed on the left side of the machine body 7 through 6 screws.

The screw rear bearing seat assembly comprises a screw rear bearing seat 12, an angular contact bearing 13 and a bearing gland 15. The angular contact bearing 13 is arranged in a hole of the screw rear bearing seat 12, the left surface of the outer ring of the bearing is limited by the left step surface of the screw rear bearing seat 12, the right surface of the outer ring of the bearing is limited by the bearing gland 15, and the inner ring of the bearing is limited by the screw rear water throwing ring 11 and the bearing retainer ring 14. The screw rear bearing block assembly is fixed on the right side of the machine body 7 through 6 screws.

The screw transmission mechanism mainly comprises a screw 8, a screw shaft 9, a flat key 10, a screw front water slinging ring 6, a locking nut 4, a screw rear water slinging ring 11 and a bearing retainer ring 14.

The screw 8 is fixed on a screw shaft 9 through a flat key 10, a front water slinger 6 and an inner ring of a cylindrical roller bearing 6 are sequentially arranged on the screw shaft 9 at the left end of the screw and are pressed together by a locking nut 4, and a rear bearing water slinger 11 and an inner ring of an angular contact bearing 13 are sequentially arranged on the screw shaft 9 at the right end of the screw and are pressed by a bearing retainer ring 14 and a screw and are fixed together with the screw 8. Two ends of the screw transmission mechanism are supported by front and rear bearings arranged in the screw front bearing seat assembly and the screw rear bearing seat assembly, so that the meshing precision and the rotary motion precision of the screw transmission mechanism and the star wheel transmission mechanism are ensured.

And the screw rod shaft 9 at the left end of the screw rod transmission mechanism transmits the power of the motor to the screw rod through the coupler 2 and drives the star wheel transmission mechanism to rotate.

The star wheel transmission mechanism comprises a star wheel small end cover component, a star wheel shaft component and a star wheel large end cover component.

The star wheel small end cover component comprises a star wheel small end cover 16, a star wheel small end pressing sleeve 17, a deep groove ball bearing 18, a star wheel small end supporting seat 19, a star wheel small end bearing retainer ring 20, a wave-shaped gasket 22 and a star wheel small end bearing gasket 23.

The deep groove ball bearing 18 is arranged in a hole of the star wheel small end cover 16, the right side of the outer bearing ring of the deep groove ball bearing is positioned through a step surface in the right side of the star wheel small end cover 16, a star wheel small end bearing gasket 23 and a waveform gasket 22, and the left side of the bearing is pressed and positioned through a star wheel small end support 19, a star wheel small end pressing sleeve 17 and a supporting screw. The star wheel small end cover assembly is fixed on the machine body 7 through 3 screws.

The star wheel large end cover component comprises a star wheel large end cover 37, a double-row angular contact bearing 38, a star wheel large end bearing retainer ring 39, a star wheel large end supporting seat 40, a star wheel large end bearing pressing sleeve 41, a star wheel large end bearing gasket 35 and a disc spring 36.

The double-row angular contact bearing 38 is installed in a hole of the star wheel big end cover 37, the left side of the bearing outer ring is positioned through a step surface in the left side of the star wheel big end cover 37, a star wheel big end bearing retainer ring 39 and a butterfly spring 36, and the right side of the bearing outer ring is pressed and positioned through a star wheel big end supporting seat 40, a star wheel big end bearing pressing sleeve 41 and a supporting screw. The star wheel big end cover part is fixed on the right side surface of the machine body 7 through 6 screws.

The star wheel shaft part comprises a star wheel shaft 32, a star wheel 31, a star wheel pin 30, a star wheel pin elastic ring 29, a star wheel sheet retainer ring 28, a left spring seat 25, a spring 26, a right spring seat 27, a star wheel small-end water throwing ring 24, a star wheel small-end bearing spacer 21, a star wheel small-end bearing retainer ring 20, a star wheel large-end water throwing ring 33, a star wheel large-end bearing spacer 35 and a star wheel large-end bearing retainer ring 39.

The star wheel sheet is radially positioned with a star wheel shaft 32 through a star wheel pin 30 and a star wheel pin elastic ring 29, and is tightly pressed on a fan-shaped large end face of the star wheel shaft 32 through a left spring seat 25, a spring 26 and a right spring seat 27.

The star wheel shaft 32 is sequentially sleeved with a star wheel big end water throwing ring 33, a star wheel big end bearing spacer 34, a double-row angular contact bearing 38 inner ring in a sliding manner in the right end shaft diameter, and is pressed on the right end face of the star wheel shaft 32 by a star wheel big end retainer ring 39.

The star wheel shaft 32 is provided with a star wheel small-end water throwing ring 24, a star wheel small-end bearing spacer 21 and a deep groove ball bearing 18 which are sleeved in a sliding manner in sequence in the right end shaft diameter, and a star wheel small-end bearing retainer ring 20 is pressed on the left end face of the star wheel shaft.

The star wheel shaft components are respectively supported by a deep groove ball bearing 18 arranged in a star wheel small end cover 16 and a double-row angular contact bearing 38 arranged in a star wheel large end cover 37.

The upper and lower two sets of star wheel transmission mechanisms are circumferentially arrayed in the center of the screw, and the 6-head screw drives the 11-tooth star wheel sheets to rotate, so that air or process gas in a screw groove of the screw is compressed, and the motion of 12 pistons in the cylinder block is equivalent.

Compared with the prior art, the invention has the following advantages:

1. because water is used as a medium, the isothermal compression process is approached, the efficiency is high, the compressor saves energy by 15 to 30 percent compared with a piston-like and double-screw oil-free compressor, the temperature of a compression chamber of the double-screw dry oil-free compressor reaches about 200 ℃, a large part of energy is consumed on heat energy, and the operating temperature of a water-lubricated single-screw oil-free machine is only about 50 ℃.

2. The principle of fluid pressure balance is applied, a pressure relief flow guide method is adopted, the structure principle is simple, the manufacturability is good, only a plurality of small holes need to be drilled on the end face of the screw rod, and the manufacturing cost is low.

3. Because the traditional mechanical seal or carbon ring seal is eliminated, the purchase cost is greatly reduced, and more importantly, the problem of fluid leakage caused by seal abrasion or failure is eliminated.

4. Because no sealing quick-wear part is arranged, the reliability of the long-term operation of the machine is improved, the machine does not need to be stopped to replace a sealing part, and the machine can be safely applied to continuous working industries such as chemical industry, textile industry, medical industry and the like.

5. Because water is used as a compression medium, the temperature is low, and the combustion point is not existed, so that the gas compressor can be used for compressing inflammable and explosive process gases.

6. Because of no shaft seal, the mechanical structure is compact, and the compressor can be conveniently changed and modified into a medium-pressure oil-free compressor with two-stage or multi-stage compression.

7. The oil-free compressor with large capacity and large power needs 6 mechanical seals or carbon ring seals with larger size and volume, and is easy to generate high friction heat and larger friction rotation torque, and the technical problem of designing and manufacturing the oil-free compressor with the pressure of more than 250kw is solved due to the elimination of the mechanical seals.

The shaft-seal-free water-lubricated single-screw oil-free compressor with the pressure balanced by the screw holes can provide 100% of pure air or process gas, has the advantages of zero emission, no pollution, low noise, low energy consumption, simple structure, no sealing, no leakage, high reliability, high cost performance, low maintenance cost and the like by replacing oil with water, and is an energy-saving and environment-friendly green new product.

Claims

1. A single-screw oil-free compressor without shaft seal and water lubrication for balancing pressure by using a screw hole is characterized by mainly comprising a machine body assembly, a screw front bearing assembly, a screw rear bearing seat assembly, a screw transmission mechanism and two groups of star wheel transmission mechanisms, wherein the two groups of star wheel transmission mechanisms are arranged above and below the screw transmission mechanism and are vertically and symmetrically arranged at the center of a screw.

2. A shaft seal-free water-lubricated single-screw oil-free compressor for balancing pressure by using a screw hole is characterized by comprising a bearing waterproof shaft seal-free leakage-free device and a pressure relief flow guide type seal-free working principle and method (figure 1): the characteristic lies in, it applies the law of fluid motion and adopts the method of pressure relief and flow guide to prevent the fluid from flowing into the bearing, thus the traditional mechanical seal and other sealing elements are cancelled.

3. The machine body assembly (fig. 5) of the shaftless water-lubricated single-screw oil-free compressor for balancing pressure by using the screw hole as claimed in claim 1, which mainly comprises a motor connecting seat 1 and a machine body 7, wherein a square air inlet for connecting an air inlet valve and an air filter or a process gas filter and a water-air mixed fluid circular exhaust hole for connecting a one-way valve are arranged above the machine body, a water spray opening is respectively arranged at each of two sides of the machine body 7 and the central position of the screw 8, a cylindrical hole in the middle of the machine body 7 is in clearance fit with the screw 8, and a set of star wheel transmission mechanisms are respectively arranged in the vertical direction.

4. The screw front bearing block assembly (figure 5) of the shaftless water-lubricated single-screw oil-free compressor for balancing pressure by using the screw holes is characterized by mainly comprising a screw front bearing block 3 and a cylindrical roller bearing 5, wherein two labyrinth end surface annular grooves are formed in the left end surface of the screw front bearing block 3 and are in clearance fit with a screw front water slinging ring 6 fixed on a screw shaft 9, 4 water drain holes are respectively drilled in the radial direction and the axial direction of the screw front bearing block 3, and the screw front bearing block assembly is installed on the left side of a machine body 7.

5. The screw rear bearing block assembly (figure 5) of the shaftless water-lubricated single-screw oil-free compressor for balancing pressure by using the screw holes is characterized by mainly comprising a screw rear bearing block 12 and an angular contact bearing 13, wherein two labyrinth end surface annular grooves are arranged on the right end surface of the screw rear bearing block 12 and are in clearance fit with a screw rear water slinging ring 11 fixed on a screw shaft 9, 4 water drain holes are respectively drilled on the screw rear bearing block 12 in the radial direction and the axial direction, and the screw rear bearing block assembly is arranged on the right side of a machine body 7.

6. The screw driving mechanism (figure 5) of the shaftless water-lubricated single-screw oil-free compressor with the screw hole for pressure balance is characterized by mainly comprising a screw 8, a screw shaft 9, a flat key 10, a screw front water slinger 6, a locking nut 4, a screw rear water slinger 11 and a bearing retainer ring 14, wherein the screw 8 is fixed on the screw shaft 9 through the flat key 10, the front water slinger 6 and a cylindrical roller bearing 5 are sequentially arranged on the left outer circle of the screw shaft 9 and are tightly pressed with the end face of the screw by the locking nut 4, the rear bearing water slinger 11 and an angular contact bearing 13 are sequentially arranged on the right outer circle of the screw shaft 9 and are tightly pressed with the right end face of the screw by the bearing retainer ring 14 and a screw.

7. The star wheel transmission mechanism of the shaftless water-seal lubrication single-screw oil-free compressor for balancing pressure by using the screw hole as claimed in claim 1, which mainly comprises a star wheel small end cover component, a star wheel large end cover component and a star wheel shaft component.

8. The star wheel small end cover component (figure 6) of the star wheel transmission mechanism is characterized by mainly comprising a star wheel small end cover 16, a star wheel small end pressing sleeve 17, a deep groove ball bearing 18, a star wheel small end supporting seat 19, a star wheel small end bearing retainer ring 20, a waveform gasket 22 and a star wheel small end bearing gasket 23, wherein a labyrinth annular end face groove is arranged on the left end face of the star wheel small end cover 16 and keeps a certain movement fit clearance with a movable ring of a star wheel small end water slinging ring 24 fixed on a star wheel shaft 32, and 4 water drainage holes are drilled in the radial direction and the axial direction of the star wheel small end cover respectively.

9. The star wheel big end cover component (figure 6) of the star wheel transmission mechanism is characterized by mainly comprising a star wheel big end cover 37, a double-row angular contact bearing 38, a star wheel big end bearing retainer ring 39, a star wheel big end supporting seat 40, a star wheel big end bearing pressing sleeve 41, a star wheel big end bearing gasket 35 and a disc spring 36, wherein a labyrinth ring-shaped end surface groove is arranged on the right end surface of the star wheel big end cover 37 and keeps a certain movement fit clearance with a star wheel big end water throwing ring 33 moving ring fixed on a star wheel shaft 32, and 4 water draining holes are drilled in the radial direction and the axial direction of the star wheel big end cover.

10. The star wheel shaft component (figure 6) of the star wheel transmission mechanism is characterized by mainly comprising a star wheel shaft 32, a star wheel sheet 31, a star wheel pin 30, a star wheel pin elastic ring 29, a star wheel sheet retainer ring 28, a left spring seat 25, a spring 26, a right spring seat 27, a star wheel small end water slinging ring 24, a star wheel small end bearing spacer 21, a star wheel small end bearing retainer ring 20, a star wheel large end water slinging ring 33, a star wheel large end bearing spacer 34 and a star wheel large end bearing retainer ring 39, wherein the star wheel sheet 31 is radially positioned with the star wheel shaft 32 through the star wheel pin 30 and the star wheel pin elastic ring 29 and is tightly pressed on the large end face of the star wheel shaft 32 through the left spring seat 25, the spring 26 and the right spring seat 27, the star wheel shaft is sequentially sleeved with the star wheel large end water slinging ring 33, the star wheel large end bearing spacer 34, a double star wheel bearing 38 in a sliding manner on the right end shaft diameter, and is tightly pressed on the right end face of the star wheel shaft 32 through the, the star wheel transmission mechanism is characterized in that the upper and lower star wheel transmission mechanisms are circumferentially arrayed in the center of a screw 8, and a star wheel sheet 31 is driven by the screw 8 to rotate so as to compress air or process gas in a screw groove.