Water-lubricated screw compressor structure

Abstract

The utility model discloses a water lubrication screw compressor structure which comprises a motor and a machine head, the motor comprises a motor rotor, the machine head comprises a machine shell and a screw rotor, the screw rotor is arranged in the machine shell, and the motor rotor and the screw rotor are vertically arranged; the screw rotor is sleeved with a sliding bearing, a water supply hole is formed in the upper portion of the sliding bearing, and water flow sprayed out of the water supply hole can provide downward thrust for the sliding bearing. The water-lubricated screw compressor structure has the advantages that the water-lubricated screw compressor structure adopts a vertical arrangement form, and the resultant force generated by the weight of the motor rotor and the screw rotor and the thrust of high-pressure water flow sprayed from the water supply hole is used for balancing the axial force of gas, so that the end surface abrasion of a sliding bearing is reduced, the exhaust end surface gap of the compressor is effectively maintained, and the performance of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw compressor technical field, specifically, relate to a water lubrication screw compressor structure. BACKGROUND

[0002] In recent years, global energy crisis and global climate warming, prompting people's energy saving consciousness increasing, energy saving and emission reduction has become the common goal of all industries and all fields. With the development of industrial level, the requirement of industrial equipment is increasingly strict.

[0003] At present, the vertical arrangement form of screw compressor exists mainly for oil injection screw compressor, the bearing adopted by oil injection screw compressor is rolling bearing, the heat generation of rolling bearing is larger than that of sliding bearing in the running process, the service life is not as good as sliding bearing, and the cost is also higher than that of sliding bearing, and because there is oil in the system, the absolute oil-free compressed air cannot be realized, so the use scene is greatly limited. For the industry with extremely high compressed air quality requirement, such as biological medicine, food and beverage, fine chemical industry, precision electronics, etc., water lubrication screw compressor needs to be used.

[0004] The current water lubrication screw compressor adopts horizontal arrangement form, which is mainly composed of a group of compression rotors, a casing, sliding bearings, thrust bearings and other components. The compressed medium is sucked into the compression chamber from the air inlet and compressed, and finally discharged from the air outlet. The water lubrication screw compressor adopting horizontal arrangement form cannot effectively balance the gas axial force, the radial graphite sliding bearing end face wears seriously, and thus cannot effectively maintain the clearance between the compressor exhaust end faces, which affects the performance of the compressor. In addition, the main shaft of the compressor and the water seal shaft sleeve adopt interference fit, which is not convenient to install. Therefore, in order to improve the production efficiency of water lubrication screw compressor and enhance the performance of the compressor, the problems of balancing gas axial force and assembly need to be solved. UTILITY MODEL CONTENTS

[0005] In order to solve at least one of the above technical problems, the utility model provides a water lubrication screw compressor structure, which vertically arranges the motor rotor and the screw rotor, and sets a water supply hole above the sliding bearing, so that the water flow sprayed from the water supply hole can provide downward thrust for the sliding bearing, thereby effectively balancing the gas axial force and reducing the end face wear of the sliding bearing.

[0006] The utility model solves the technical problems by adopting the following technical scheme:

[0007] A water lubrication screw compressor structure, comprising a motor and a head, the motor comprising a motor rotor, the head comprising a casing and a screw rotor, the screw rotor being arranged in the casing, the motor rotor and the screw rotor being vertically arranged, a sliding bearing being sleeved on the screw rotor, a water supply hole being arranged above the sliding bearing, the water flow sprayed from the water supply hole being able to provide downward thrust for the sliding bearing.

[0008] Furthermore, the water supply hole is provided on the exhaust bearing seat of the compressor, and the water supply hole faces the gap between the sliding bearing and the thrust bearing, so that the water supply structure is simple.

[0009] Furthermore, the water supply holes include two holes, each facing the gap between two sliding bearings and corresponding thrust bearings provided at the exhaust end of the compressor.

[0010] Furthermore, the motor is configured as a water-cooled motor, the cooling water outlet of the motor is connected to a header, a main water supply tank is provided on the exhaust bearing seat of the compressor, and the header is connected to the main water supply tank through a first branch pipe, so that the cooling water of the motor and the head are connected in series.

[0011] Furthermore, the collecting pipe is connected to the water supply hole through a second branch pipe, and the second branch pipe is provided with a pressure regulating valve to regulate the water pressure of the water flow sprayed out of the water supply hole.

[0012] Furthermore, a water spray throttle plug is provided on the casing, and the water spray throttle plug is connected to the main water supply tank.

[0013] Furthermore, the protruding end of the compressor screw rotor main shaft is sequentially sleeved with a first lip seal, an air flotation ring and a second lip seal from top to bottom, and is located in a sealed cavity between the protruding end of the screw rotor main shaft and the casing; the air flotation ring is provided with an air vent that passes through the air flotation ring and extends radially, and there is a gap between the inner wall of the air flotation ring and the screw rotor main shaft; the casing is provided with a ventilation pipe, the first end of the ventilation pipe is connected to the ventilation hole; the second end of the ventilation pipe is used to connect to the compressed air source, so that the first lip seal and the second lip seal are suspended on the screw rotor main shaft to reduce wear.

[0014] Furthermore, a shaft sleeve is provided on the main shaft of the screw rotor of the compressor, and the shaft sleeve is clearance-matched with the main shaft of the screw rotor. A groove is provided on the inner wall of the shaft sleeve, and a sealing ring is provided in the groove to facilitate assembly.

[0015] Furthermore, the suction end gland of the motor is provided with a water leak to prevent cooling water from entering the motor cavity and damaging the motor rotor.

[0016] Furthermore, the compressor structure is supported on a frame, which includes a plurality of support columns. The suction end gland of the motor is arranged on the upper part of the support column through a shock-absorbing pad, and the head is arranged in the accommodating space formed by each support column.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] (1) the water lubrication screw compressor structure adopts the vertical arrangement mode of motor rotor, suction end gland, shell, screw rotor, thrust bearing, sliding bearing and exhaust bearing seat, and a water supply hole is arranged above the sliding bearing, so that the high-pressure water flow sprayed from the water supply hole can provide downward thrust for the sliding bearing, the resultant force of the weight of the motor rotor and the screw rotor and the thrust of the high-pressure water flow balances the gas axial force, thereby reducing the sliding bearing end surface wear, effectively maintaining the compressor exhaust end surface gap, and improving the compressor performance.

[0019] (2) the water pressure in the water supply hole is adjusted through the pressure regulating valve, the downward thrust generated by the high-pressure water sprayed from the water supply hole on the sliding bearing can be accurately adjusted, so that the resultant force of the weight of the motor rotor and the screw rotor and the thrust of the high-pressure water flow is appropriate, and the gas axial force is effectively balanced.

[0020] (3) the shaft sleeve and the screw rotor main shaft are gap-fitted and sealed by a sealing ring, the shaft sleeve is convenient to install while ensuring the sealing performance, can improve the assembly efficiency, reduce the overall design cost, and is suitable for wide promotion. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to better understand the above and other purposes, features, advantages and functions of the present application, reference can be made to the embodiments shown in the drawings. The same reference signs in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to illustrate the preferred embodiments of the present application, and have no limiting effect on the scope of the present application, and the various parts in the drawings are not drawn to scale.

[0022] Figure 1 is a schematic view of the outer shape structure of the water lubrication screw compressor of the present application.

[0023] Figure 2 is a schematic view of the internal structure of the water lubrication screw compressor of the present application.

[0024] Figure 3 is a schematic view of the water supply hole structure of the water lubrication screw compressor of the present application.

[0025] Figure 4 is a schematic view of the water supply hole structure of the water lubrication screw compressor of the present application.

[0026] Figure 5 is a schematic view of the sealing structure of the water lubrication screw compressor of the present application.

[0027] Figure 6 is a schematic view of the air floating ring structure of the water lubrication screw compressor of the present application.

[0028] Figure 7 is a schematic view of the water leakage port structure of the water lubrication screw compressor of the present application.

[0029] In the figure: 1-motor; 101-motor rotor; 102-suction end gland; 103-leakage port; 2-head; 201-casing; 202-screw rotor; 203-sliding bearing; 204-water supply hole; 205-exhaust bearing seat; 206-thrust bearing; 207-main water supply groove; 208-pressure regulating valve; 209-water injection throttle plug; 210-screw rotor spindle; 211-first lip seal; 212-air floating ring; 2121-air hole; 213-second lip seal; 214-air pipe; 215-bush; 216-sealing ring; 3-frame; 301-supporting column; 302-damping pad. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the following describes exemplary embodiments of the disclosure, including various details of the embodiments of the disclosure to help understanding, which should be considered as merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the disclosure. Also, for clarity and conciseness, the description below omits the description of well-known functions and structures.

[0031] In the description of the utility model, it needs to be explained that the term "comprising" and its variants represent open inclusion, that is, "including but not limited to". The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] The utility model provides a kind of water lubrication screw compressor structure, refer to Figures 1-3 As shown in the figure, it includes motor 1 and head 2, the motor 1 includes motor rotor 101, the head 2 includes casing 201 and screw rotor 202, the screw rotor 202 is arranged in casing 201, the motor rotor 101 is vertically arranged with screw rotor 202;Sliding bearing 203 is set on the screw rotor 202, water supply hole 204 is provided above the sliding bearing 203, and the water flow sprayed by the water supply hole 204 can provide downward thrust for the sliding bearing 203.

[0033] The motor rotor 101 of the water lubrication screw compressor and the screw rotor 202 are vertically arranged, and correspondingly, the suction end gland 102 of the motor 1, the casing 201, the thrust bearing 206, the sliding bearing 203 and the exhaust bearing seat 205 and other components are combined vertically arranged, and the overall compressor structure adopts vertical arrangement.

[0034] In a water-lubricated screw compressor, the axial force of the gas is directed upward, while the gravity of the motor rotor 101 and the screw rotor 202 is directed downward. The weight of the motor rotor 101 and the screw rotor 202 can be used to offset a portion of the axial force of the gas, thereby reducing the resultant axial force acting on the sliding bearing 203 and reducing wear on the end face of the sliding bearing 203. A water supply hole 204 is provided above the sliding bearing 203. The water flow ejected from the water supply hole 204 can provide a downward thrust for the sliding bearing 203. Thus, when the weight of the motor rotor 101 and the screw rotor 202 cannot further reduce wear on the end face of the sliding bearing 203, the high-pressure water flow ejected from the water supply hole 204 can provide a downward thrust for the sliding bearing 203, further offsetting the upward axial force of the gas, reducing wear on the end face of the sliding bearing 203, effectively maintaining the exhaust end face clearance of the compressor, and improving compressor performance.

[0035] When the compressor is arranged horizontally, the gas force on the screw rotor 202 (female and male rotors) will drive the female and male rotors to move toward the suction end face. The sliding bearing 203 of the water-lubricated screw compressor uses a radial graphite sliding bearing 203. At this time, the radial graphite sliding bearing 203 set at the exhaust end of the compressor will contact the end face of the thrust bearing 206, causing wear. The greater the axial force of the gas, the more severe the wear. When the motor rotor 101 and the screw rotor 202 are arranged vertically, such as Figure 3 As shown, a thrust bearing 206 is arranged above the radial graphite sliding bearing 203 at the exhaust end of the compressor. There is a gap between the end face of the sliding bearing 203 and the end face of the thrust bearing 206. A water supply hole 204 can be set on the exhaust bearing seat 205 of the compressor. The water supply hole 204 faces the gap between the sliding bearing 203 and the thrust bearing 206. In this way, the water supply structure is simple and the flow channel is convenient to be arranged on the casing 201. High-pressure water can be sprayed toward the gap between the sliding bearing 203 and the thrust bearing 206 through the water supply hole 204, and sprayed toward the end face of the sliding bearing 203 under the action of high water pressure, providing downward thrust for the sliding bearing 203.

[0036] The water-lubricated screw compressor has two radial graphite sliding bearings 203 respectively arranged on the male rotor and the female rotor. Accordingly, the water supply holes 204 include two, which are respectively oriented towards the gaps between the two sliding bearings 203 arranged at the exhaust end of the compressor and the corresponding thrust bearings 206, which can provide downward thrust to the two sliding bearings 203 at the same time to reduce wear.

[0037] In one embodiment, Figure 4As shown, the motor 1 is configured as a water-cooled motor 1. The cooling water outlet of the motor 1 is connected to a header. A main water supply tank 207 is provided on the exhaust bearing seat 205 of the compressor. The header is connected to the main water supply tank 207 via a first branch pipe. The cooling water of the motor 1 and the compressor head 2 flows in series through the header and the first branch pipe. The motor 1 has low power consumption and low heat generation. The cooling water first cools the motor 1 and then enters the head 2 through the main water supply tank 207 to cool various parts of the compressor head 2. The cooling water of the motor 1 and the compressor head 2 is connected in series, which reduces the system piping layout. After the cooling water passes through the main water supply tank 207, it cools various parts of the compressor head 2. No external piping is required. The water system has fewer leakage points, which improves system reliability.

[0038] In one embodiment, Figure 4 As shown, the manifold is connected to the water supply hole 204 via a second branch pipe, which is equipped with a pressure regulating valve 208. The water supply hole 204 is connected to the compressor's cooling water system via the second branch pipe, which provides high-pressure water to the water supply hole 204. This simplifies the piping structure. By regulating the water pressure of the water ejected from the high-pressure water supply hole 204 via an external pressure regulating valve 208, the downward thrust exerted by the high-pressure water ejected from the water supply hole 204 on the sliding bearing 203 is optimized, thereby balancing the combined force of the weight of the motor rotor 101 and the screw rotor main shaft 210, and the axial force of the gas. By adjusting the water pressure in the water supply hole 204 through the pressure regulating valve 208, the downward thrust of the high-pressure water ejected from the water supply hole 204 on the sliding bearing 203 can be precisely adjusted, so that the resultant force generated by the weight of the motor rotor 101 and the screw rotor 202 and the thrust of the high-pressure water flow is appropriate, effectively balancing the axial force of the gas, and preventing the water supply pressure at the cooling water outlet of the motor 1 from being too high, which would cause the high-pressure water to generate too much downward thrust on the sliding bearing 203, pulling the screw rotor 202 downward and wearing the end face of the screw rotor 202.

[0039] In one embodiment, Figure 1 As shown, the housing 201 is provided with a water spray throttle plug 209, which is connected to the main water supply tank 207. By adjusting the gap between the water spray throttle plug 209 and the opening in the housing 201, the amount of water sprayed by the compressor can be adjusted, and water mist is formed to achieve sufficient heat exchange between the cooling water and the compressed gas.

[0040] In one embodiment, Figure 5As shown, the protruding end of the compressor screw rotor main shaft 210 is sequentially sleeved with a first lip seal 211, an air flotation ring 212 and a second lip seal 213 from top to bottom, and is located in a sealed cavity between the protruding end of the screw rotor main shaft 210 and the casing 201; the air flotation ring 212 is provided with an air vent 2121 that passes through the air flotation ring 212 and extends radially, and there is a gap between the inner wall of the air flotation ring 212 and the screw rotor main shaft 210; the casing 201 is provided with a ventilation pipe 214, the first end of the ventilation pipe 214 is connected to the ventilation hole 2121; the second end of the ventilation pipe 214 is used to connect to the compressed air source.

[0041] The compressor's screw rotor main shaft 210 extends out of the compressor casing 201 and connects to the motor rotor 101. The extended end of the screw rotor main shaft 210 is sealed to the casing 201 by a first lip seal 211 and a second lip seal 213. An air ring 212 is positioned between the first and second lip seals 211, 213, separating the first and second lip seals 211, 213. This allows the lower end of the first lip seal 211 to separate from the upper end of the second lip seal 213, creating a ventilation cavity between the first and second lip seals 211, 213. A ventilation duct 214 is provided within the casing 201 and directly communicates with the ventilation cavity, eliminating the need for separate piping within the compressor and simplifying the piping structure.

[0042] Pressurized gas enters the ventilation cavity formed between the first lip seal 211 and the second lip seal 213 through the ventilation duct 214, then enters the center of the air ring 212 through the ventilation hole 2121. It can then flow smoothly along the screw rotor shaft 210 toward the lips of the first lip seal 211 and the second lip seal 213 through the gap between the inner wall of the air ring 212 and the screw rotor shaft 210. As the screw rotor shaft 210 rotates, the pressurized gas squeezes the lips, separating them from the screw rotor shaft 210 because the lips of the lip seals are relatively soft. This creates a gap between the lip seals and the screw rotor shaft 210, allowing the first lip seal 211 and the second lip seal 213 to float on the surface of the screw rotor shaft 210, avoiding contact with the shaft 210 and reducing wear. The lip seal is provided with a rubber seal ring, which still maintains the seal. Therefore, an air flotation ring 212 is provided between the first lip seal 211 and the second lip seal 213 to ensure the sealing performance while reducing the wear of the lip seal and increasing its life. Figure 6 As shown, the air floating ring 212 is configured as an I-shaped air floating ring 212 , and the air floating ring 212 is provided with a plurality of evenly distributed vent holes 2121 along its circumference.

[0043] In one embodiment, Figure 5As shown, the compressor's screw rotor main shaft 210 is provided with a sleeve 215, which has a clearance fit with the screw rotor main shaft 210. A first lip seal 211, an air ring 212, and a second lip seal 213 are sleeved on the sleeve 215. The clearance fit between the sleeve 215 and the screw rotor main shaft 210 facilitates installation of the sleeve 215 on the screw rotor main shaft 210. Furthermore, to prevent cooling water from leaking into the motor cavity through the gap between the sleeve 215 and the screw rotor main shaft 210, a groove is provided on the inner wall of the sleeve 215, with a sealing ring 216 disposed within the groove. Preferably, the groove is configured as an O-ring groove, and a matching sealing O-ring is used for the sealing ring 216. The first lip seal 211, the air ring 212, the second lip seal 213, and the sealing ring 216 form a sealed structure to prevent cooling water leakage. The shaft sleeve 215 is easy to install while ensuring sealing performance, can improve assembly efficiency, reduce the design cost of the entire machine, and is suitable for large-scale promotion.

[0044] In one embodiment, Figure 7 As shown, the suction end gland 102 of the motor 1 is provided with a water leakage port 1021. When the seal between the screw rotor main shaft 210 and the motor rotor 101 fails and cooling water enters the motor cavity, the cooling water can be discharged from the water leakage port 1021, thereby preventing the cooling water from entering the motor cavity and damaging the motor rotor 101.

[0045] like Figure 1 and Figure 2 As shown, the compressor structure is supported on a frame 3, and the frame 3 includes a plurality of support columns 301. The suction end pressure cover 102 of the motor 1 is arranged on the upper part of the support column 301 through a shock-absorbing pad 302, and the head 2 is arranged in an accommodating space enclosed by each support column 301. The water-lubricated screw compressor adopts a vertical arrangement, with the motor 1, the casing 201 and the exhaust bearing seat 205 from top to bottom. The motor 1 is fixed on the support column 301, and the suction end pressure cover 102 of the motor 1 is arranged on the upper part of the support column 301 through a shock-absorbing pad 302 to reduce vibration. In order to increase the rigidity of the frame 3, a crossbeam can also be set between the support columns 301. The support columns 301 can be connected to the ground, and each support column 301 encloses a accommodating space. The head 2 is suspended in the accommodating space, which is easy to install, has stable support, and saves floor space.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A water-lubricated screw compressor structure, characterized in that: It includes a motor and a head, the motor includes a motor rotor, the head includes a casing and a screw rotor, the screw rotor is arranged in the casing, and the motor rotor and the screw rotor are arranged vertically; a sliding bearing is provided on the screw rotor, and a water supply hole is provided above the sliding bearing, and the water flow sprayed from the water supply hole can provide downward thrust for the sliding bearing.

2. The water-lubricated screw compressor structure according to claim 1, characterized in that: The water supply hole is arranged on the exhaust bearing seat of the compressor, and the water supply hole faces the gap between the sliding bearing and the thrust bearing.

3. The water-lubricated screw compressor structure according to claim 2, characterized in that: There are two water supply holes, each facing the gap between two sliding bearings and corresponding thrust bearings arranged at the exhaust end of the compressor.

4. The water-lubricated screw compressor structure according to claim 1, characterized in that: The motor is configured as a water-cooled motor, a cooling water outlet of the motor is connected to a header, a main water supply tank is provided on the exhaust bearing seat of the compressor, and the header is connected to the main water supply tank through a first branch pipe.

5. The water-lubricated screw compressor structure according to claim 4, characterized in that: The collecting pipe is connected to the water supply hole through a second branch pipe, and the second branch pipe is provided with a pressure regulating valve.

6. The water-lubricated screw compressor structure according to claim 4, characterized in that: A water spray throttle plug is provided on the casing, and the water spray throttle plug is connected to the main water supply tank.

7. The water-lubricated screw compressor structure according to claim 1, characterized in that: The protruding end of the compressor screw rotor main shaft is sequentially sleeved with a first lip seal, an air flotation ring and a second lip seal from top to bottom, and is located in a sealed cavity between the protruding end of the screw rotor main shaft and the casing; the air flotation ring is provided with an air vent that passes through the air flotation ring and extends radially, and there is a gap between the inner wall of the air flotation ring and the screw rotor main shaft; the casing is provided with a ventilation pipe, the first end of the ventilation pipe is connected to the ventilation hole; the second end of the ventilation pipe is used to connect to the compressed air source.

8. The water-lubricated screw compressor structure according to claim 1, characterized in that: A shaft sleeve is provided on the main shaft of the screw rotor of the compressor. The shaft sleeve is clearance-matched with the main shaft of the screw rotor. A groove is provided on the inner wall of the shaft sleeve, and a sealing ring is provided in the groove.

9. The water-lubricated screw compressor structure according to claim 1, characterized in that: The suction end gland of the motor is provided with a water leakage port.

10. The water-lubricated screw compressor structure according to claim 1, characterized in that: The compressor structure is supported on a frame, which includes a plurality of support columns. The suction end gland of the motor is arranged on the upper part of the support column through a shock-absorbing pad, and the head is arranged in the accommodating space enclosed by each support column.

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