Small dry type screw vacuum pump

Abstract

The invention discloses a small-sized dry-type screw vacuum pump, and relates to the technical field of vacuum pumps, the small-sized dry-type screw vacuum pump comprises a shell, both sides of the shell are provided with air vents, the upper surface of the shell is provided with a bypass port, two rotors are rotatably arranged in the shell, and side plates are symmetrically arranged on both sides of the shell; the small dry-type screw vacuum pump comprises two side plates, a rotor is arranged on the side plates, rotating shafts are symmetrically and rotationally arranged between the two side plates, the corresponding rotating shafts are fixedly sleeved with the rotors, one end of each rotating shaft penetrates through one side plate and is fixedly connected with a gear in a sleeving mode, the two gears are connected in a meshed mode, and a motor is arranged on the outer side of one side plate. The rotor sleeves the rotating shaft through the fixing groove and the clamping strip and is matched with the gear for meshing, so that the stable synchronous reverse rotation of the rotor is ensured, and the air exhaust efficiency and the vacuum degree stability are improved; on the other hand, the supporting plates, the side supports, the reinforcing rods and the like are designed to enhance the supporting structure, the part damage risk is reduced, and the service life of the pump is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumps, in particular to a small dry screw vacuum pump. Background Art

[0002] Roots vacuum pump, also known as Roots pump, is a vacuum pump that relies on the pushing action of a pair of synchronous and counter-rotating blade rotors in the pump chamber to move gas and achieve vacuum. Its characteristic is that it can maintain a high vacuum speed under high vacuum degree, and can quickly and effectively extract the gas in the system, shorten the vacuuming time and improve production efficiency.

[0003] After checking the announcement number: CN115929633A, a small dry screw vacuum pump is disclosed. This technology discloses "including a main pump mechanism, the main pump mechanism includes a main pump layer, the main pump layer is annular, and the front and rear ends of the main pump layer are fixedly connected to a connecting ring plate, an inner layer is provided inside the main pump layer, the inner layer is annular and adapted to the main pump layer, the main pump layer and the inner layer are positively sleeved, and a space is left between the main pump layer and the inner layer, the inner side wall of the connecting ring plate of the main pump layer is fixedly connected to a panel 1, the front and rear ends of the inner layer are fixedly connected to the panel 1, the inner layer is symmetrically provided with a shaft body 1, the front and rear ends of the shaft body 1 are correspondingly penetrated and movably connected to the panel 1 through the bearing, and other technical solutions have the advantages of secondary suction through the device, thereby ensuring the smoothness of the gas inside the main pump mechanism, thereby increasing the upper limit of the speed of the impeller 1, and thus improving the vacuum degree of the device, etc." However, the above technology still has the following problems: First, the rotation stability of the high-vacuum Roots vacuum pump using the above technology needs to be improved. In terms of the connection between the rotor and the shaft and the synchronization of operation, the conventional connection method may not be able to ensure a reliable connection between the rotor and the shaft, and the torque transmission is easily affected, resulting in unstable rotor rotation; at the same time, the accuracy of the synchronous reverse rotation of the rotor of some pumps is poor, which affects the pumping function, resulting in low pumping efficiency and poor vacuum stability.

[0004] Secondly, the existing design of the high-vacuum Roots vacuum pump using the above technology is unable to effectively cope with the vibration and pressure generated by the operation of the pump. The installation connection of the pump body is unstable and lacks a reinforced structural design. As a result, the components are easily damaged by vibration, which greatly shortens the service life of the pump.

[0005] In response to the above problems, the inventors proposed a small dry screw vacuum pump to solve the above problems. Summary of the Invention

[0006] In order to solve the problems that the rotation stability of high vacuum Roots vacuum needs to be improved and it is difficult to effectively deal with the vibration and pressure generated by the operation of the pump; the purpose of the present invention is to provide a small dry screw vacuum pump.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: a small dry screw vacuum pump, comprising a shell, vents are provided on both sides of the shell, a bypass port is provided on the upper surface of the shell, two rotors are rotated in the shell, side plates are symmetrically provided on both sides of the shell, and a rotating shaft is symmetrically rotated through the two side plates, the rotor is fixedly sleeved on the corresponding rotating shaft, one end of the rotating shaft passes through one of the side plates and is fixedly sleeved with a gear, and the two gears are meshed and connected, a motor is provided on the outside of one of the side plates, and the output end of the motor is fixedly connected to one of the rotating shafts.

[0008] Preferably, side brackets are symmetrically fixed on the lower surface of the shell, and a support plate is commonly provided on the lower sides of the two side brackets. The support plate is clamped on the side bracket, and the side bracket and the support plate are connected by bolts. Bolt fixing blocks are symmetrically fixed on both sides of the support plate, and a reinforcing rod is symmetrically fixed between the two side brackets.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention fixes the rotor on the rotating shaft through the cooperation of the fixing groove and the clamping strip. This connection method not only ensures the reliable connection between the rotor and the rotating shaft, but also can accurately transmit the torque and make the rotor rotate stably. At the same time, the two gears are engaged and connected, which ensures that the two rotors can accurately and synchronously rotate in opposite directions, ensures the normal pumping function of the pump, and improves the pumping efficiency and the stability of the vacuum degree.

[0010] The support plate of the present invention is clamped on the side bracket and connected by bolts. Bolt fixing blocks are provided on both sides of the support plate, and a reinforcing rod is provided between the two side brackets. These designs enhance the stability of the overall support structure of the pump, can better withstand the vibration and pressure generated when the pump is running, reduce the risk of component damage caused by vibration, and extend the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a cross-section of the shell and an exploded view of its internal structure.

[0014] Figure 3 This is an exploded view of the bracket and support plate structure of the present invention. Figure 4 It is a structural schematic diagram of the side bracket of the present invention.

[0015] In the figure: 1. Shell; 11. Vent; 12. Bypass port; 13. Reinforcement groove; 2. Rotor; 21. Side plate; 22. Rotating shaft; 221. Fixing groove; 222. Clip; 23. Gear; 24. Motor; 25. Sealing ring; 26. Guard plate; 3. Side bracket; 31. Support plate; 32. Bolt fixing block; 33. Reinforcement rod. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] Example: Figure 1-3 As shown, the present invention provides a small dry screw vacuum pump, including a shell 1, with vents 11 on both sides of the shell 1, a bypass port 12 on the upper surface of the shell 1, two rotors 2 are rotatably arranged in the shell 1, and side plates 21 are symmetrically provided on both sides of the shell 1. The side plates 21 and the shell 1 are connected by a number of bolts. The side plates 21 and the shell 1 are connected by a number of bolts. This connection method ensures the stability of the structure, is easy to disassemble and install, and is conducive to the maintenance and inspection of the rotor 2 and other components inside the pump. A rotating shaft 22 is symmetrically provided between the two side plates 21 for rotation, and the outer surface of the rotating shaft 22 is symmetrically movably connected with a sealing ring 25, and the inner side of the sealing ring 25 is fixedly connected to the corresponding side plate 21. The outer surface of the rotating shaft 22 is symmetrically movably connected with a sealing ring 25, and the inner side of the sealing ring 25 is fixedly connected to the corresponding side plate 21. Fixed connection, effectively preventing gas from leaking from the gap between the rotating shaft 22 and the side plate 21, improving the sealing performance of the pump, and helping to maintain a high vacuum degree. The rotor 2 is fixedly sleeved on the corresponding rotating shaft 22, and a through-type fixing groove 221 is opened on one side of the rotor 2. The outer surface of the rotating shaft 22 is symmetrically fixed with a clamping strip 222, and the clamping strip 222 is clamped in the corresponding fixing groove 221. One end of the rotating shaft 22 passes through one of the side plates 21 and is fixedly sleeved with a gear 23, and the two gears 23 are meshed and connected. When the vacuum pump is started or the working state needs to be adjusted, it can be operated through the bypass port 12. When starting, the bypass valve is opened, and part of the gas flows directly from the bypass port 12 through the bypass pipe to the exhaust port (the air vent 11 on the other side), reducing the starting load and avoiding motor overload; under special working conditions, the bypass port 12 can also be used to adjust the pumping speed or pressure of the pump.

[0018] A motor 24 is provided on the outside of one of the side panels 21, a guard plate 26 is fixedly provided on the outside of one of the side panels 21, and the motor 24 and the guard plate 26 are fixedly connected. A guard plate 26 is fixedly provided on the outside of one of the side panels 21, and the motor 24 and the guard plate 26 are fixedly connected. The guard plate 26 can protect the motor 24 and prevent the motor 24 from being damaged by collision by external objects. At the same time, it can also reduce the impact of the heat generated by the operation of the motor 24 on the surrounding environment to a certain extent. The output end of the motor 24 is fixedly connected to one of the rotating shafts 22. After the motor 24 is started, its output end drives one of the rotating shafts 22 connected thereto to rotate. Since the fixed portion on the rotating shaft 22 A gear 23 is fixedly connected, and the two gears 23 are meshed with each other, so the rotation of one shaft 22 will cause the other shaft 22 to rotate synchronously and in the opposite direction through the transmission of the gear 23. The two shafts 22 respectively drive their respective fixedly connected rotors 2 to rotate synchronously and in the opposite direction in the shell 1. When the rotor 2 rotates, the space at the air vent 11 on one side of the shell 1 gradually increases, forming a low-pressure area. Under the action of the pressure difference, the gas is sucked into the shell 1 from the air vent 11. As the rotor 2 continues to rotate, the sucked gas is brought to the air vent 11 on the other side. At this time, the space at the vent 11 gradually decreases, and the gas is compressed and discharged from the shell 1, thereby realizing the exhaust function.

[0019] The outer surface of the shell 1 is provided with several reinforcing grooves 13. The outer surface of the shell 1 is provided with several reinforcing grooves 13. These reinforcing grooves 13 can increase the strength and rigidity of the shell 1, so that the shell 1 can better withstand the internal gas pressure and external forces, prevent the shell 1 from deforming, and ensure the normal operation and vacuum performance of the pump. The side brackets 3 are symmetrically fixed on the lower surface of the shell 1, and the lower sides of the two side brackets 3 are jointly provided with a support plate 31, which is clamped on the side bracket 3, and the side bracket 3 and the support plate 31 are connected by bolts. Bolt fixing blocks 32 are symmetrically fixed on both sides of the support plate 31, and a reinforcing rod 33 is symmetrically fixed between the two side brackets 3. The support plate 31 is clamped on the side bracket 3 and connected by bolts, and bolt fixing blocks 32 are provided on both sides of the support plate 31, and a reinforcing rod 33 is also provided between the two side brackets 3. These designs enhance the stability of the overall supporting structure of the pump, can better withstand the vibration and pressure generated when the pump is running, reduce the risk of component damage caused by vibration, and extend the service life of the pump.

[0020] Working principle: After the motor 24 is started, its output end drives one of the rotating shafts 22 connected to it to rotate. Since the rotating shaft 22 is fixedly sleeved with a gear 23 and the two gears 23 are meshed and connected with each other, the rotation of one rotating shaft 22 is transmitted by the gear 23, causing the other rotating shaft 22 to rotate synchronously and in the opposite direction; The two rotating shafts 22 respectively drive the rotors 2 fixedly sleeved thereto to rotate synchronously in opposite directions within the housing 1. As the rotors 2 rotate, the space at the vent 11 on one side of the housing 1 gradually increases, forming a low-pressure area. Gas is sucked into the housing 1 through the vent 11 due to the pressure difference. As the rotors 2 continue to rotate, the sucked gas is brought to the vent 11 on the other side. At this time, the space at the vent 11 gradually decreases, and the gas is compressed and discharged from the housing 1, thereby achieving a vacuum function. When the vacuum pump is started or the working state needs to be adjusted, it can be operated through the bypass port 12. When starting, open the bypass valve, and part of the gas flows directly from the bypass port 12 through the bypass pipe to the exhaust port (the other side vent 11), reducing the starting load and avoiding motor overload. Under special working conditions, the bypass port 12 can also be used to adjust the pumping speed or pressure of the pump. A number of reinforcement grooves 13 are provided on the outer surface of the shell 1, and side brackets 3 are symmetrically fixed on the lower surface of the shell 1, and a support plate 31 is provided on the lower sides of the two side brackets 3. The support plate 31 is clamped on the side bracket 3, and the side bracket 3 and the support plate 31 are connected by bolts. Bolt fixing blocks 32 are symmetrically fixed on both sides of the support plate 31, and a reinforcement rod 33 is symmetrically fixed between the two side brackets 3. The support plate 31 is clamped on the side bracket 3 and connected by bolts, and bolt fixing blocks 32 are provided on both sides of the support plate 31, and a reinforcement rod 33 is also provided between the two side brackets 3. These designs enhance the stability of the overall support structure of the pump, can better withstand the vibration and pressure generated during the operation of the pump, reduce the risk of component damage caused by vibration, and extend the service life of the pump.

[0021] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A small dry screw vacuum pump, comprising a housing (1), characterized in that: Both sides of the shell (1) are provided with vents (11), the upper surface of the shell (1) is provided with a bypass port (12), two rotors (2) are rotatably provided in the shell (1), side plates (21) are symmetrically provided on both sides of the shell (1), and a rotating shaft (22) is symmetrically passed through and rotatably provided between the two side plates (21), the rotor (2) is fixedly sleeved on the corresponding rotating shaft (22), one end of the rotating shaft (22) passes through one of the side plates (21) and is fixedly sleeved with a gear (23), and the two gears (23) are meshed and connected, a motor (24) is provided on the outer side of one of the side plates (21), and the output end of the motor (24) is fixedly connected to one of the rotating shafts (22).

2. A small dry screw vacuum pump according to claim 1, characterized in that: Side brackets (3) are symmetrically fixed on the lower surface of the shell (1), and a support plate (31) is commonly provided on the lower sides of the two side brackets (3). The support plate (31) is clamped on the side bracket (3), and the side bracket (3) and the support plate (31) are connected by bolts. Bolt fixing blocks (32) are symmetrically fixed on both sides of the support plate (31).

3. A small dry screw vacuum pump according to claim 1, characterized in that: The outer surface of the shell (1) is provided with a plurality of reinforcement grooves (13).

4. A small dry screw vacuum pump according to claim 1, characterized in that: A guard plate (26) is fixedly provided on the outer side of one of the side plates (21), and the motor (24) is fixedly connected to the guard plate (26).

5. A small dry screw vacuum pump according to claim 1, characterized in that: The side plate (21) and the housing (1) are connected by a plurality of bolts.

6. A small dry screw vacuum pump according to claim 1, characterized in that: A sealing ring (25) is symmetrically and movably sleeved on the outer surface of the rotating shaft (22), and the inner side of the sealing ring (25) is fixedly connected to the corresponding side plate (21).

7. A small dry screw vacuum pump according to claim 1, characterized in that: A through-type fixing groove (221) is provided on one side of the rotor (2), and clamping strips (222) are symmetrically fixedly provided on the outer surface of the rotating shaft (22), and the clamping strips (222) are clamped in the corresponding fixing groove (221).

8. A small dry screw vacuum pump according to claim 2, characterized in that: A reinforcing rod (33) is symmetrically fixed between the two side brackets (3).

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