Energy-saving oil-free screw compressor

Abstract

The invention relates to the technical field of screw compressors, and discloses an energy-saving oil-free screw compressor which comprises a motor, a rotor shell, an exhaust shell and a gear shell, the motor is connected with the rotor shell through an air inlet shell, and a pair of rotors are arranged in the rotor shell in parallel; the air inlet shell is communicated with an air inlet hopper, a rotor air inlet groove is formed in the rotor shell, an air distribution plate is horizontally arranged in the rotor air inlet groove, a rotor air inlet is formed in the inner wall of the rotor air inlet groove, a mounting cavity and two cooling air inlets are formed in the rotor shell, and the mounting cavity is communicated with the air inlet hopper. The lower end of the rotor air inlet groove communicates with a buffer shell through a short pipe, a one-way valve is arranged on the short pipe, and a plurality of cooling channels are symmetrically formed in the rotor. Part of inlet air is used for cooling the rotor, heat generated by compression is taken away through the cooling channels, the rotor is prevented from being overheated and deformed, and normal operation of the rotor is maintained; the overall efficiency of the compressor is improved and energy loss is reduced.

Description

Technical Field

[0001] The invention relates to the field of screw compressors, and in particular to an energy-saving oil-free screw compressor. Background Art

[0002] In modern industrial production, oil-free screw compressors are widely used in food and beverage, pharmaceutical manufacturing, electronic semiconductors, chemical industry and other fields with strict requirements on air quality due to their advantages of no oil pollution, high reliability and easy maintenance. With the improvement of industrial automation and the promotion of energy conservation and emission reduction policies, the market has put forward higher requirements on the performance, energy efficiency and stability of oil-free screw compressors.

[0003] There are many problems that need to be solved in the actual operation of traditional oil-free screw compressors. For example, the compressor will generate heat during operation. If the heat cannot be dissipated and cooled in time, it will affect the working efficiency and service life of the equipment. Although the "semi-enclosed twin-screw compressor and compressor system" disclosed in Chinese application number "CN202510120751.5" also solves the above problems and cools the heat generated during the operation of the compressor in time, it uses the gas to be compressed to cool the motor, but cannot effectively cool the rotor. The gas will generate a lot of heat during the compression process. If it cannot be effectively cooled in time, it will cause the rotor and other components to deform due to thermal expansion, destroying the meshing accuracy between the rotors, thereby affecting the compression efficiency and equipment stability.

[0004] Therefore, it is necessary to provide an energy-saving oil-free screw compressor to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide an energy-saving oil-free screw compressor to solve the existing problems in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an energy-saving oil-free screw compressor, comprising a motor, a rotor housing, an exhaust housing and a gear housing, wherein the motor and the rotor housing are connected via an intake housing, a pair of rotors are arranged in parallel in the rotor housing, and the pair of rotors mesh with each other and form a compression chamber with the rotor housing;

[0007] An air inlet hopper is connected to the air inlet housing. A rotor air inlet groove is provided on the rotor housing. A gas distribution plate is horizontally arranged in the rotor air inlet groove. Rotor air inlet ports are formed on the inner wall of the rotor air inlet groove, and the rotor air inlet ports are located above the gas distribution plate. An installation cavity and two cooling air inlet ports are provided on the rotor housing, and the cooling air inlet ports are communicated with the compression cavity. The lower end of the rotor air inlet groove is communicated with a buffer housing through a short pipe. The buffer housing is located in the installation cavity and covers both cooling air inlet ports at the same time. A one-way valve is provided on the short pipe. A plurality of cooling channels are symmetrically formed on the rotor, and the cooling channels are circumferentially distributed along the axis of the rotor and are wound.

[0008] As a further solution of the present invention, a gas guide plate is inclined in the air inlet housing, and the gas is guided to the rotor air inlet groove through the gas guide plate.

[0009] As a further solution of the present invention, a slide valve is further provided in the rotor housing. The slide valve is arranged below a pair of rotors and extends along the axial direction of the rotor. A slide valve adjusting mechanism is provided on the side wall of the gear housing, and the slide valve adjusting mechanism drives the slide valve to move axially. A slide valve through groove is formed at one end of the rotor housing away from the air inlet housing.

[0010] As a further solution of the present invention, the slide valve includes a slide valve body and a slide valve head end. An exhaust wall is obliquely connected between the slide valve body and the slide valve head end. Two rotor contact surfaces are symmetrically provided at the upper end of the slide valve body, and the rotor contact surfaces are in contact with a pair of rotors to form a seal.

[0011] As a further solution of the present invention, the rotating shaft of the rotor passes through the exhaust housing and extends into the gear housing and is provided with a synchronous gear, and the two synchronous gears are meshed. A partition plate is provided in the exhaust housing, and the rotating shaft of the rotor is located above the partition plate. An exhaust outlet is formed at the lower end of the exhaust housing, and the exhaust outlet is located below the partition plate.

[0012] As a further solution of the present invention, a cooling air outlet is formed on the end face of the rotor housing away from the air inlet housing. A connecting housing covers the cooling air outlet, and a connecting pipe is communicated with the connecting housing.

[0013] As a further solution of the present invention, the connecting housing is communicated with the slide valve adjusting mechanism through a connecting pipe. A return pipe is communicated between the air outlet end of the slide valve adjusting mechanism and the air inlet hopper, and the position where the air inlet hopper is communicated with the return pipe is above the filter.

[0014] As a further solution of the present invention, the slide valve regulating mechanism includes an adjusting cylinder, and the connecting pipe is communicated with the adjusting cylinder. A one-way valve is provided on the connecting pipe. A piston rod is provided on the slide valve, and one end of the piston rod away from the slide valve extends into the adjusting cylinder and is equipped with a piston. The piston is slidably connected in the adjusting cylinder. A return spring is jointly provided between the piston and the adjusting cylinder, and the return spring is sleeved on the piston rod. The return pipe is communicated with the adjusting cylinder. Both the return pipe and the connecting pipe are arranged on the side of the piston away from the return spring. An electromagnetic valve is provided on the return pipe.

[0015] The present invention has a unique cooling system design. A number of cooling channels are symmetrically distributed on the rotor. These channels are circumferentially distributed along the axis of the rotor and are wound. Part of the cooling gas entering from the cooling air inlet directly enters the cooling channels. During the flow in the channels, it exchanges heat with the rotor fully. Since the cooling channels are arranged around the rotor, they can comprehensively cover the working area of the rotor, take away a large amount of heat generated by the rotor during the process of compressing gas, effectively reduce the temperature of the rotor, avoid the deformation or performance degradation of the rotor caused by overheating, ensure the normal operation and meshing accuracy of the rotor, improve the overall efficiency of the compressor, reduce energy loss. The slide valve regulating mechanism can adjust the effective length of the compression space by changing the position of the slide valve according to the actual gas consumption demand, accurately control the amount of gas entering the compression chamber, realize the energy regulation of the compressor, and avoid unnecessary energy consumption; use the cooling gas to drive the slide valve and further improve the energy utilization rate through gas reflux, significantly reducing the energy consumption. Brief Description of the Drawings

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is the perspective view of the present invention;

[0018] Figure 2 is the structural schematic diagram of the present invention;

[0019] Figure 3 is the cross-sectional view of the present invention;

[0020] Figure 4 is the structural schematic diagram of the rotor housing and its connecting components part of the present invention;

[0021] Figure 5 is in the present invention Figure 4 the structural schematic diagram of the rotor housing in the opened state

[0022] Figure 6 is the internal structural schematic diagram of the rotor housing in the opened state of the present invention;

[0023] Figure 7 is the structural schematic diagram of the exhaust housing of the present invention;

[0024] Figure 8 is a schematic structural view of the intake housing in the present invention;

[0025] Figure 9 is a schematic structural view of the position of the rotor and the spool valve in the present invention;

[0026] Figure 10 is a schematic structural view of the position of the rotor and the synchronizing gear in the present invention;

[0027] Figure 11 is a schematic structural view of the spool valve in the present invention

[0028] Figure 12 is a schematic structural view of the spool valve adjusting mechanism in the present invention.

[0029] In the figure: 1, electric motor; 2, rotor housing; 3, exhaust housing; 4, gear housing; 5, intake housing; 6, rotor; 7, compression cavity; 8, intake hopper; 9, rotor intake groove; 10, air guide plate; 11, air distribution plate; 12, rotor air inlet; 13, installation cavity; 14, short pipe; 15, buffer housing; 16, cooling air inlet; 17, cooling channel; 18, synchronizing gear; 19, spool valve; 1901, spool valve body; 1902, spool valve head end; 1903, rotor contact surface; 1904, exhaust wall; 20, cooling air outlet; 21, connecting housing; 22, partition plate; 23, exhaust outlet; 24, connecting pipe; 25, adjusting cylinder; 26, piston rod; 27, piston; 28, return spring; 29, return pipe. Detailed implementation manners

[0030] Embodiment 1

[0031] As Figures 1 - 11 shown, an energy-saving oil-free screw compressor includes an electric motor 1, a rotor housing 2, an exhaust housing 3 and a gear housing 4. The electric motor 1 is connected to the rotor housing 2 through an intake housing 5. A pair of rotors 6 are arranged in parallel in the rotor housing 2. As Figure 9 and Figure 10 shown, the pair of rotors 6 includes a male rotor and a female rotor, and the male rotor and the female rotor mesh with each other. The male rotor is connected to the output shaft of the electric motor 1. The electric motor 1 drives the male rotor to rotate, and then drives the meshing female rotor to rotate. The male rotor and the female rotor have parallel axes, and the male rotor and the female rotor rotate around their respective axes. The male rotor and the female rotor are combined into a meshing structure through teeth and corresponding grooves, and form a compression cavity 7 with the rotor housing 2.

[0032] An air inlet housing 5 is connected to an air inlet hopper 8, and a filter is provided inside the air inlet hopper 8. To prevent dust, impurities, etc. from entering the compressor interior and avoid abrasion of key components such as the rotor 6, which would affect the performance and service life of the compressor, a rotor air inlet groove 9 is provided on the rotor housing 2, and a guide plate 10 is inclined in the air inlet housing 5 (refer to Figure 8 ). The guide plate 10 guides the gas to flow more smoothly towards the rotor air inlet groove 9, reducing the resistance and turbulence of gas flow.

[0033] As Figures 4 - 6 shown, a gas distribution plate 11 is horizontally arranged in the rotor air inlet groove 9, and the end of the gas distribution plate 11 close to the guide plate 10 is a flow guiding conical tip. A rotor air inlet 12 is opened on the inner wall of the rotor air inlet groove 9, and the rotor air inlet 12 is located above the gas distribution plate 11. An installation cavity 13 and two cooling air inlets 16 are provided on the rotor housing 2, and the cooling air inlets 16 are communicated with the compression cavity 7. The lower end of the rotor air inlet groove 9 is communicated with a buffer housing 15 through a short pipe 14, and the buffer housing 15 is located in the installation cavity 13 and covers both cooling air inlets 16 at the same time. The buffer housing 15 is located in the installation cavity 13 and covers both cooling air inlets 16.

[0034] The function of the buffer housing 15 is to buffer the incoming cooling gas to make the gas pressure more stable. At the same time, the buffer housing 15 evenly distributes the cooling gas to the two cooling air inlets 16 to prepare for subsequent cooling of the rotor 6. A one-way valve is provided on the short pipe 14. The setting of the cooling air inlets 16 can be communicated with the cooling channels 17 and does not affect the installation of the bearings of the rotor 6.

[0035] As Figure 9 and Figure 10 shown, a number of cooling channels 17 are symmetrically opened on the rotor 6, and the cooling channels 17 are circumferentially distributed along the axis of the rotor 6 and are wound. The number of cooling channels 17 is equal to the number of spiral teeth of the rotor 6. A part of the cooling gas entering from the cooling air inlet 16 directly enters the cooling channels 17, and during the flow in the channels, it exchanges heat with the rotor 6 sufficiently. Since the cooling channels 17 surround the rotor, they can fully cover the working area of the rotor 6, take away a large amount of heat generated by the rotor 6 during the process of compressing gas, effectively reduce the temperature of the rotor 6, avoid deformation or performance degradation of the rotor 6 due to overheating, and ensure the normal operation and meshing accuracy of the rotor 6.

[0036] As Figure 5 and Figure 9As shown, a slide valve 19 is further provided inside the rotor housing 2, and the slide valve 19 is arranged below a pair of rotors 6 and extends along the axial direction of the rotors 6. A slide valve adjusting mechanism is provided on the side wall of the gear housing 4, and the slide valve adjusting mechanism drives the slide valve 19 to move axially. A slide valve through groove is opened at one end of the rotor housing 2 away from the intake housing 5. The slide valve 19 can close or block a part of the compression cavity 7, thereby adjusting the effective length of the compression space formed between the rotors 6, so as to control the amount of gas entering the compression chamber and achieve energy adjustment.

[0037] As Figure 11 shown, the slide valve 19 includes a slide valve body 1901 and a slide valve head end 1902, and the shape of the slide valve through groove corresponds to the shape of the slide valve body 1901. An exhaust wall 1904 is obliquely connected between the slide valve body 1901 and the slide valve head end 1902. Even when the slide valve body 1901 completely enters the rotor housing 2, the compressed high-pressure gas can enter the exhaust housing 3 through the gap between the slide valve through groove and the exhaust wall 1904. Two rotor contact surfaces 1903 are symmetrically provided at the upper end of the slide valve body 1901. The rotor contact surfaces 1903 are in contact with a pair of rotors 6 and form a seal, thereby preventing the gas in the compression cavity 7 from leaking between the rotors 6 and the rotor contact surfaces 1903.

[0038] As Figure 9 and Figure 10 shown, the rotating shaft of the rotor 6 passes through the exhaust housing 3 and extends into the gear housing 4 and is provided with a synchronous gear 18, and the two synchronous gears 18 are meshed. As Figure 7 shown, a partition plate 22 is provided inside the exhaust housing 3, and the rotating shaft of the rotor 6 is located above the partition plate 22. An exhaust outlet 23 is opened at the lower end of the exhaust housing 3, and the exhaust outlet 23 is located below the partition plate 22.

[0039] As Figure 5 and Figure 6 shown, a cooling air outlet 20 is opened at the end face of the rotor housing 2 away from the intake housing 5. The cooling air outlet 20 is covered with a connecting housing 21. A connecting pipe 24 is communicated with the connecting housing 21, and the connecting pipe 24 passes through the exhaust housing 3 and extends outwards.

[0040] The outside air first enters through the intake hopper 8. The filter in the intake hopper 8 filters the air, removes the impurities and dust therein, and ensures the cleanliness of the air entering the compressor. The filtered air enters the intake housing 5. Under the action of the inclined air guide plate 10, the air is guided to the rotor intake groove 9. When the air reaches the rotor intake groove 9, the air distribution plate 11 shunts the air, so that a part of the air enters the compression cavity 7 through the rotor air inlet 12.

[0041] After the motor 1 starts, its output shaft drives the male rotor to rotate. Since the male rotor and the female rotor are meshed with each other, the rotation of the male rotor will drive the female rotor to rotate synchronously. The male rotor and the female rotor form a compression cavity 7 with the rotor housing 2 through the combination structure of teeth and corresponding grooves. As the rotor continues to rotate, the volume of the compression cavity 7 gradually decreases, and the gas is compressed therein, and the pressure continuously increases, realizing the compression of the gas. The compressed high-pressure gas enters the exhaust housing 3 through the gap between the slide valve through groove and the exhaust ratio 1904, and then is discharged from the exhaust outlet 23 for use by subsequent gas-consuming equipment of the compressor.

[0042] Another part of the gas entering the rotor intake groove 9 will enter the buffer housing 15 through the short pipe 14. The gas in the buffer housing 15 enters directly into the cooling channels 17 distributed circumferentially along the axis and wound around the rotor 6 through a part of the cooling air inlet 16, and another part of the gas enters the compression cavity 7 and is compressed along with the gas passing through the rotor air inlet 12. The gas in the intake cooling channels 17 flows in the cooling channels 17, taking away the heat generated by the rotor 6 during the compression process, realizing the cooling of the rotor 6. The cooled gas is discharged from the cooling air outlet 20 on the end face of the rotor housing 2 away from the intake housing 5, enters the connecting housing 21, and is then transported outward through the connecting pipe 24.

[0043] The slide valve adjusting mechanism on the side wall of the gear housing 4 can drive the slide valve 19 to move axially. The slide valve 19 is arranged below a pair of rotors 6 and extends along the axial direction of the rotors 6. When the slide valve 19 moves, it can block or cover a part of the compression cavity 7, adjusting the effective length of the compression space formed between the rotors 6. When the effective length of the compression space changes, the amount of gas entering the compression chamber will also change accordingly, thus realizing the energy adjustment of the compressor, enabling the compressor to adjust the output gas volume according to the actual gas consumption demand and achieving the purpose of energy saving.

[0044] Embodiment 2

[0045] On the basis of Embodiment 1, as Figure 12 shown, the connecting housing 21 is communicated with the slide valve adjusting mechanism through the connecting pipe 24 for adjusting the slide valve adjusting mechanism. A return pipe 29 is communicated between the air outlet end of the slide valve adjusting mechanism and the intake hopper 8, and the position where the intake hopper 8 is communicated with the return pipe 29 is above the filter.

[0046] The slide valve regulating mechanism includes a regulating cylinder 25, and the connecting pipe 24 is communicated with the regulating cylinder 25. A one-way valve is provided on the connecting pipe 24 to ensure that the gas can only flow into the regulating cylinder 25 unidirectionally, prevent the gas from flowing back, ensure the stability and directionality of the power input of the slide valve regulating mechanism, and the stable gas supply ensures that the slide valve regulating mechanism can work reliably, avoiding the adjustment failure or instability caused by the gas backflow; at the same time, the setting of the one-way valve protects the cooling system and the slide valve regulating mechanism, preventing damage to the equipment caused by abnormal pressure. A piston rod 26 is provided on the slide valve 19, and one end of the piston rod 26 away from the slide valve 19 extends into the regulating cylinder 25 and is provided with a piston 27, and the piston 27 is slidably connected in the regulating cylinder 25. A return spring 28 is jointly provided between the piston 27 and the regulating cylinder 25, and the return spring 28 is sleeved on the piston rod 26. The return pipe 29 is communicated with the regulating cylinder 25, and both the return pipe 29 and the connecting pipe 24 are arranged on the side of the piston 27 away from the return spring 28. An electromagnetic valve is provided on the return pipe 29 to realize the recycling of the gas.

[0047] The electromagnetic valve controls the on-off of the return pipe 29. According to the operating state and adjustment requirements of the compressor, it accurately controls the gas pressure in the regulating cylinder 25, and then controls the movement and reset of the slide valve 19, improving the energy utilization rate and reducing gas waste; by flexibly controlling the gas return through the electromagnetic valve, it can quickly respond to the changes in the operating conditions of the compressor, realize the quick adjustment and precise control of the slide valve, so that the compressor can maintain efficient operation under different loads and reduce energy consumption.

[0048] The cooling gas discharged from the connecting housing 21 enters the regulating cylinder 25 of the slide valve regulating mechanism through the connecting pipe 24. The gas entering the regulating cylinder 25 pushes the piston 27 to move. Since the piston 27 is installed at one end of the piston rod 26 and the other end of the piston rod 26 is connected to the slide valve 19, the movement of the piston 27 drives the piston rod 26 to move, and then the slide valve 19 moves axially. When the slide valve 19 moves, it closes or blocks a part of the compression cavity 7, adjusts the effective length of the compression space between the rotors 6, realizes the control of the gas volume entering the compression chamber, and completes the energy adjustment of the compressor; when it is necessary to reduce the displacement of the slide valve 19, the electromagnetic valve on the return pipe 29 is opened, and part of the gas in the regulating cylinder 25 flows back to the air intake hopper 8 through the return pipe 29. At this time, under the elastic force of the return spring 28, the piston 27 moves in the reverse direction, driving the slide valve 19 to reset to a suitable position.

[0049] The gas at the outlet end of the slide valve regulating mechanism flows back to the air intake hopper 8 through the return pipe 29, and the return position is above the filter. This can not only recover the energy of part of the gas and improve the energy utilization efficiency, but also avoid the extra burden on the filter caused by the impurities in the return gas.

Claims

1. An energy-saving oil-free screw compressor, comprising a motor, a rotor housing, an exhaust housing and a gear housing. The motor is connected to the rotor housing through an intake housing. A pair of rotors are arranged in parallel in the rotor housing, and the pair of rotors mesh with each other and form a compression cavity with the rotor housing. It is characterized in that: An air intake hopper is connected to the air intake housing. A rotor air intake groove is provided on the rotor housing. A gas distribution plate is horizontally arranged in the rotor air intake groove. Rotor air inlet openings are formed on the inner wall of the rotor air intake groove, and the rotor air inlet openings are located above the gas distribution plate. An installation cavity and two cooling air inlet openings are provided on the rotor housing, and the cooling air inlet openings are communicated with the compression cavity. The lower end of the rotor air intake groove is communicated with a buffer housing through a short pipe, and the buffer housing is located in the installation cavity and covers both cooling air inlet openings at the same time. A one-way valve is provided on the short pipe. A plurality of cooling channels are symmetrically formed on the rotor, and the cooling channels are circumferentially distributed along the axis of the rotor and are wound around.

2. The energy-saving oil-free screw compressor according to claim 1, characterized in that: A gas guide plate is inclinedly arranged in the air intake housing, and the gas is guided to the rotor air intake groove through the gas guide plate.

3. The energy-saving oil-free screw compressor according to claim 1, characterized in that: A slide valve is further provided in the rotor housing, and the slide valve is arranged below a pair of rotors and extends along the axial direction of the rotor. A slide valve adjustment mechanism is provided on the side wall of the gear housing, and the slide valve adjustment mechanism drives the slide valve to move axially. A slide valve through groove is formed at one end of the rotor housing away from the air intake housing.

4. The energy-saving oil-free screw compressor according to claim 3, wherein: The slide valve includes a slide valve body and a slide valve head end. An exhaust wall is inclinedly connected between the slide valve body and the slide valve head end. Two rotor contact surfaces are symmetrically provided at the upper end of the slide valve body, and the rotor contact surfaces are in contact with a pair of rotors to form a seal.

5. An energy-saving oil-free screw compressor according to claim 1, characterized in that: The rotating shaft of the rotor extends through the exhaust housing to the inside of the gear housing and is provided with a synchronous gear, and the two synchronous gears are meshed. A partition plate is provided in the exhaust housing, and the rotating shaft of the rotor is located above the partition plate. An exhaust outlet is formed at the lower end of the exhaust housing, and the exhaust outlet is located below the partition plate.

6. The energy-saving oil-free screw compressor according to claim 3, characterized in that: A cooling air outlet is formed at the end face of the rotor housing away from the air intake housing. A connection housing covers the cooling air outlet. A connection pipe is communicated with the connection housing.

7. An energy-saving oil-free screw compressor according to claim 6, characterized in that: The connection housing is communicated with the slide valve adjustment mechanism through the connection pipe. A return pipe is communicated between the air outlet end of the slide valve adjustment mechanism and the air intake hopper, and the position where the air intake hopper is communicated with the return pipe is above the filter.

8. The energy-saving oil-free screw compressor according to claim 7, characterized in that: The slide valve adjustment mechanism includes an adjustment cylinder, and the connection pipe is communicated with the adjustment cylinder. A one-way valve is provided on the connection pipe. A piston rod is provided on the slide valve, and one end of the piston rod away from the slide valve extends into the adjustment cylinder and is provided with a piston, and the piston is slidably connected in the adjustment cylinder. A return spring is jointly provided between the piston and the adjustment cylinder, and the return spring is sleeved on the piston rod. The return pipe is communicated with the adjustment cylinder, and both the return pipe and the connection pipe are arranged on the side of the piston away from the return spring. An electromagnetic valve is provided on the return pipe.

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