Integrated dry type oil-free two-stage screw vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, and discloses an integrated dry-type oil-free two-stage screw vacuum pump which comprises a pump shell, a first-stage dry-type screw cavity is arranged in the pump shell, cooling water can be filled through a liquid inlet pipe, the cooling water flows into a plurality of first cooling pipes and a plurality of second cooling pipes from the liquid inlet pipe, and the first-stage dry-type screw cavity is communicated with the first-stage dry-type screw cavity. A partition plate is arranged in a first-stage dry type screw cavity to form a cooling cavity, a first cooling pipe is placed in the cooling cavity, cooling water is put into the first cooling pipe in the cooling cavity to cool the first-stage dry type screw cavity, in the operation process of the vacuum pump, movement of gas molecules is aggravated due to high temperature, and the retention time of the gas molecules in the pump can be possibly prolonged; the pump body is cooled through the first cooling pipe, gas molecules can be compressed and discharged more easily, the air exhaust efficiency is improved, the outer surface of the first cooling pipe is connected with the second cooling pipe in a penetrating mode, the compressed gas is cooled through the second cooling pipe, and the gas molecules can be compressed and transported more easily.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically an integrated dry oil-free two-stage screw vacuum pump. Background Technology

[0002] In modern industrial production and scientific research, the demand for vacuum environments is becoming increasingly widespread and demanding. Traditional vacuum pumps are gradually revealing some limitations in many application scenarios. Many chemical reactions and separation processes need to be carried out under vacuum conditions to improve reaction rates, reduce reaction temperatures, and prevent oxidation of substances. However, traditional oil-lubricated vacuum pumps may allow oil vapor to mix into the reaction system, contaminating the product and affecting its quality and purity. This is unacceptable for some fine chemical synthesis processes that are extremely sensitive to impurities. At the same time, when handling gases containing condensable or corrosive gases, oil-based lubrication and sealing systems are easily damaged, leading to decreased vacuum pump performance, frequent failures, increased maintenance costs, and downtime.

[0003] A search revealed that Chinese utility model patent publication number CN216198984U discloses a type of oil-free two-stage vacuum pump, comprising a housing, a base, a gearbox, a motor, a pair of screw rotors, and a pair of Roots rotors. The housing is mounted on the base, with an intake port on the front and an exhaust port on the back. The internal cavity of the housing is divided into interconnected Roots rotor chambers and screw rotor chambers. The Roots rotor chambers are adjacent to and connected to the intake port, and the screw rotor chambers are adjacent to and connected to the exhaust port. The pair of Roots rotors and the pair of screw rotors are vertically mounted in the Roots rotor chambers and the pair of screw rotors, respectively. The gearbox is mounted on the top of the housing, and the motor drives the pair of screw rotors and the pair of Roots rotors to rotate synchronously through the gearbox. This type of oil-free two-stage vacuum pump integrates a pair of screw rotors and a pair of Roots rotors within its housing, offering the advantage of small size while significantly improving the pumping speed and ultimate vacuum level.

[0004] However, the device lacks a cooling function, which means it cannot cool the high-temperature pump body during use. This causes gas molecules to move more rapidly and stay in the pump for a longer time, reducing pumping efficiency. In addition, the device does not have a filter screen, so it cannot filter out solid particles and dust, which causes friction on the surfaces of components such as the screw rotor and pump body, increasing wear on the components. Utility Model Content

[0005] The purpose of this invention is to provide an integrated dry oil-free two-stage screw vacuum pump to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an integrated dry oil-free two-stage screw vacuum pump, comprising a pump housing, a primary dry screw chamber disposed inside the pump housing, a secondary dry screw chamber disposed inside the pump housing near the primary dry screw chamber, a partition plate fixedly connected inside the primary dry screw chamber, a cooling chamber disposed inside the primary dry screw chamber, a plurality of cooling pipes I disposed inside the cooling chamber, an inlet pipe fixedly connected to one end of each cooling pipe I, the pump housing penetrating through the outer surface of the inlet pipe, an inlet pipe disposed inside the partition plate, a second cooling pipe penetrating through the outer surface of the first cooling pipe, a cooling plate penetrating through the partition plate, and a second cooling pipe disposed on the inner wall of the cooling plate.

[0007] Preferably, an air inlet pipe is connected through one side of the pump casing, and a retaining hole is provided on the inner wall of the air inlet pipe, with a filter screen being engaged with the inner wall of the retaining hole.

[0008] Preferably, the pump casing has an observation hole on the side near the air inlet pipe, and an observation window is fixedly connected to the inner wall of the observation hole.

[0009] Preferably, a motor is fixedly connected to the upper surface of the pump casing, a gear is fixedly connected to the output shaft of the motor, a driving screw rotor is fixedly connected to the center of the gear, a gear two meshes with the teeth of the gear, and a driven screw rotor is fixedly connected to the center of the gear two.

[0010] Preferably, a belt is rotatably connected to the outer surface of the active screw rotor, and an active Roots rotor is rotatably connected to the end of the belt away from the active screw rotor. A gear three is fixedly connected to the top of the active Roots rotor, and a gear four is meshed with the teeth of the gear three. A driven Roots rotor is fixedly connected to the center of the teeth of the gear four.

[0011] Preferably, a second motor is fixedly connected to the upper surface of the pump casing near the first motor, and the output shaft of the second motor is connected through the pump casing.

[0012] Preferably, an exhaust pipe is connected through the side of the pump casing away from the air inlet pipe, and a silencer is provided at the top of the exhaust pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this utility model, cooling water can be introduced through the inlet pipe. The cooling water flows from the inlet pipe into multiple cooling pipes 1 and 26. A cooling chamber is formed inside the primary dry screw cavity through a partition. Cooling pipes 1 are placed in the cooling chamber. After cooling water is added to cooling pipes 1 in the cooling chamber, the primary dry screw cavity is cooled down. During the operation of the vacuum pump, high temperature will intensify the movement of gas molecules and may prolong the residence time in the pump, affecting the pumping efficiency. Cooling the pump body by cooling pipes 1 makes it easier for gas molecules to be compressed and discharged, thus improving the pumping efficiency. Cooling pipes 1 and 26 are connected through the outer surface of cooling pipes 1 and 26. Cooling pipes 26 cool and compress the gas temperature, making it easier for gas molecules to be compressed and transported.

[0015] 2. This utility model has a locking hole in the air inlet pipe, which engages with the filter screen, allowing for quick replacement of the filter screen. When the filter screen is damaged and cannot be used, quick replacement allows the vacuum pump to be used quickly. The filter screen can effectively filter out solid particles, dust and other impurities in the gas, preventing them from entering the vacuum pump. If these impurities enter the pump chamber, they will cause friction on the surfaces of components such as the screw rotor and pump body, aggravating the wear of the components. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall two-stage screw vacuum pump of this utility model;

[0017] Figure 2 This is a schematic diagram of the partition and cooling chamber of this utility model;

[0018] Figure 3 This is a schematic diagram of gear one and gear two of this utility model;

[0019] Figure 4 This is a schematic diagram of the active Roots rotor and gear of this utility model;

[0020] Figure 5 This is a schematic diagram of the card hole and filter screen of this utility model;

[0021] Figure 6 This is a schematic diagram of the cooling pipe and the liquid inlet pipe of this utility model;

[0022] The image shows:

[0023] In the diagram: 1. Pump casing; 2. First-stage dry screw chamber; 3. Second-stage dry screw chamber; 4. Baffle plate; 5. Cooling chamber; 6. Cooling pipe one; 7. Liquid inlet pipe; 8. Air inlet pipe; 9. Clip hole; 10. Filter screen; 11. Observation hole; 12. Observation window; 13. Motor one; 14. Gear one; 15. Driving screw rotor; 16. Gear two; 17. Driven screw rotor; 18. Leather belt; 19. Driving Roots rotor; 20. Gear three; 21. Gear four; 22. Driven Roots rotor; 23. Motor two; 24. Exhaust pipe; 25. Silencer; 26. Cooling pipe two; 27. Cooling plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-4An integrated dry oil-free two-stage screw vacuum pump includes a pump housing 1. A primary dry screw chamber 2 is located inside the pump housing 1. A secondary dry screw chamber 3 is located inside the pump housing 1, adjacent to the primary dry screw chamber 2. A partition 4 is fixedly connected inside the primary dry screw chamber 2. A cooling chamber 5 is located inside the primary dry screw chamber 2. Multiple cooling pipes 6 are arranged inside the cooling chamber 5. One end of each cooling pipe 6 is fixedly connected to an inlet pipe 7. The outer surface of the inlet pipe 7 penetrates the pump housing 1. The partition 4 contains... A liquid inlet pipe 7 is provided, and a second cooling pipe 26 is connected through the outer surface of the first cooling pipe 6. A cooling plate 27 is connected through the inside of the partition 4, and the second cooling pipe 26 is provided on the inner wall of the cooling plate. Cooling water can be introduced through the liquid inlet pipe 7 and flows into multiple first cooling pipes 6. The first cooling pipes 6 are placed in the cooling chamber 5. The partition 4 is set inside the first-stage dry screw cavity 2 to form the cooling chamber 5. After the cooling water is introduced into the first cooling pipes 6 in the cooling chamber 5, the first-stage dry screw cavity 2 is cooled down. During operation, excessively high temperatures may cause component expansion, affecting the gaps between the screw rotors and between the rotor and the pump body. Changes in gaps increase gas leakage and reduce vacuum. Adding cooling pipe 6 for cooling can effectively control the temperature, maintain component size stability, and ensure a more stable pump vacuum. A cooling plate 27 is installed on the outer surface of the ventilation pipe to lower the temperature of the air transported in the ventilation pipe. Cooling pipe 26 is connected to the outer surface of cooling pipe 6, allowing the compressed gas to be cooled and compressed more easily, improving pumping efficiency. A primary dry screw chamber 2 and a secondary dry screw chamber 3 are set inside the pump casing 1. After the gas undergoes initial compression by the primary dry screw vacuum pump body, the pressure is increased to a certain extent before entering the secondary dry screw vacuum pump body for further compression. This two-stage compression method allows the gas to be compressed more fully, achieving a higher vacuum compared to a single-stage vacuum pump. The cooling pipe 26, connected to the outer surface of cooling pipe 6, further cools the compressed air.

[0026] In this embodiment, preferably, an air inlet pipe 8 is connected through one side of the pump casing 1. A locking hole 9 is provided on the inner wall of the air inlet pipe 8, and a filter screen 10 is locked into the inner wall of the locking hole 9. The locking hole 9 in the air inlet pipe 8 and the locking hole 9 are locked into the filter screen 10 can be quickly replaced. When the filter screen 10 is damaged and cannot be used, it can be quickly replaced so that the vacuum pump can be used quickly. The filter screen 10 can effectively filter out solid particles, dust and other impurities in the gas and prevent them from entering the vacuum pump. If these impurities enter the pump cavity, they will cause friction on the surface of components such as the screw rotor and pump body, which will aggravate the wear of the components. It also prevents impurities from accumulating after entering the pump cavity, causing flow channel blockage, affecting the normal flow of gas and the pumping performance of the vacuum pump. Especially for some small-diameter channels or precision components, a small amount of impurities may cause serious blockage problems, making the vacuum pump unable to work normally.

[0027] In this embodiment, preferably, an observation hole 11 is provided on the side of the pump casing 1 near the air inlet pipe 8, and an observation window 12 is fixedly connected to the inner wall of the observation hole 11. The observation hole 11 and the observation window 12 are provided on the outer surface of the pump casing 1. The operating status of the screw rotor inside the vacuum pump can be directly observed through the observation hole 11. It can be observed whether the rotor is rotating normally, whether the rotation speed is stable, and whether there is any abnormal vibration or shaking. If the rotor is unbalanced or stuck during the operation of the equipment, it can be detected in time, so as to avoid further deterioration of the fault and ensure the normal operation of the equipment.

[0028] In this embodiment, preferably, a motor 13 is fixedly connected to the upper surface of the pump housing 1, a gear 14 is fixedly connected to the output shaft of the motor 13, a drive screw rotor 15 is fixedly connected to the center of the gear 14, a gear 2 16 meshes with the teeth of the gear 14, and a driven screw rotor 17 is fixedly connected to the center of the gear 2 16. When the motor 13 is started, the output shaft of the motor 13 rotates, which drives the gear 14 to rotate, which in turn drives the drive screw rotor 15 to rotate, which in turn drives the gear 2 16 to rotate, and the gear 2 16 to rotate, which in turn drives the driven screw rotor 17 to rotate, so that the drive screw rotor 15 and the driven screw rotor 17 rotate together to compress the intake gas.

[0029] In this embodiment, preferably, a belt 18 is rotatably connected to the outer surface of the active screw rotor 15. An active roots rotor 19 is rotatably connected to the end of the belt 18 away from the active screw rotor 15. A gear 3 20 is fixedly connected to the top of the active roots rotor 19. The teeth of the gear 3 20 mesh with a gear 4 21. A driven roots rotor 22 is fixedly connected to the center of the teeth of the gear 4 21. When the active screw rotor 15 rotates, it drives the belt 18 to rotate. When the belt 18 rotates, it drives the active roots rotor 19 to rotate. When the active roots rotor 19 rotates, it drives the gear 3 20 to rotate. When the gear 3 20 rotates, it drives the gear 4 21 to rotate. When the gear 4 21 rotates, it drives the driven roots rotor 22 to rotate. This causes the active roots rotor 19 and the driven roots rotor 22 to rotate together, drawing in gas from the exhaust pipe and compressing it into the screw rotor.

[0030] In this embodiment, preferably, a second motor 23 is fixedly connected to the upper surface of the pump housing 1 near the first motor 13, and the output shaft of the second motor 23 is connected through the pump housing 1. The device for fixing the output shaft of the second motor 23 is the same as the device for fixing the output shaft of the first motor 13. The addition of a two-stage screw allows the gas to be compressed more fully, thereby obtaining a higher vacuum degree.

[0031] In this embodiment, preferably, an exhaust pipe 24 is connected through the side of the pump casing 1 away from the air inlet pipe 8. A silencer 25 is provided at the top of the exhaust pipe 24. Adding a silencer 25 to the exhaust pipe 24 can effectively reduce the intake and exhaust noise generated by the vacuum pump during operation, which may damage the hearing of the operator. Furthermore, being in a noisy environment for a long time can also affect the mood and work efficiency of the staff. Adding a silencer 25 can effectively reduce the intake and exhaust noise generated by the vacuum pump, making the workplace quieter and more comfortable.

[0032] In this embodiment, the test device for an integrated dry oil-free two-stage screw vacuum pump is used by starting motor 13. The output shaft of motor 13 rotates, driving gear 14 to rotate. Gear 14 then drives the active screw rotor 15, which in turn drives gear 16, which in turn drives the driven screw rotor 17. This causes both the active and driven screw rotors 15 and 17 to rotate together, compressing the intake gas. The rotation of the active screw rotor 15 also drives the belt 18, which in turn drives the active Roots rotor 19. The active Roots rotor 19 rotates, driving gear 3 20 to rotate, which in turn drives gear 4 21 to rotate, which in turn drives driven Roots rotor 22 to rotate. This causes the active and driven Roots rotors 19 and 22 to rotate together, drawing gas from the exhaust pipe and compressing it into the screw rotor. Cooling water is then introduced through the inlet pipe 7 and flows into multiple cooling pipes 6. The cooling pipes 6 are placed in the cooling chamber 5, which is formed inside the primary dry screw chamber 2 by a partition 4. Cooling water is introduced into the cooling pipes 6 in the cooling chamber 5 to cool the primary dry screw chamber 2.

[0033] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. An integrated dry-running oil-free two-stage screw vacuum pump comprising a pump housing (1), characterized in that: The pump shell (1) is provided with a first dry screw cavity (2) inside, the second dry screw cavity (3) is arranged close to the first dry screw cavity (2) inside the pump shell (1), the first dry screw cavity (2) is fixedly connected with a partition (4) inside, the first dry screw cavity (2) is provided with a cooling cavity (5) inside, a plurality of cooling pipes (6) are arranged in the cooling cavity (5), one end of the cooling pipe (6) is fixedly connected with a liquid inlet pipe (7), the liquid inlet pipe (7) is connected with the pump shell (1) penetratingly, the liquid inlet pipe (7) is arranged in the partition (4), the cooling pipe (6) is connected with a cooling pipe (26) penetratingly, the partition (4) is connected with a cooling plate (27) penetratingly, and the cooling plate (27) is provided with the cooling pipe (26).

2. The integrated dry oil-free two-stage screw vacuum pump according to claim 1, characterized in that: The pump shell (1) is provided with a first dry screw cavity (2) inside, the second dry screw cavity (3) is arranged close to the first dry screw cavity (2) inside the pump shell (1), the first dry screw cavity (2) is fixedly connected with a partition (4) inside, the first dry screw cavity (2) is provided with a cooling cavity (5) inside, a plurality of cooling pipes (6) are arranged in the cooling cavity (5), one end of the cooling pipe (6) is fixedly connected with a liquid inlet pipe (7), the liquid inlet pipe (7) is connected with the pump shell (1) penetratingly, the liquid inlet pipe (7) is arranged in the partition (4), the cooling pipe (6) is connected with a cooling pipe (26) penetratingly, the partition (4) is connected with a cooling plate (27) penetratingly, and the cooling plate (27) is provided with the cooling pipe (26).

3. The integrated dry oil-free two-stage screw vacuum pump according to claim 1, characterized in that: The pump shell (1) is provided with a first dry screw cavity (2) inside, the second dry screw cavity (3) is arranged close to the first dry screw cavity (2) inside the pump shell (1), the first dry screw cavity (2) is fixedly connected with a partition (4) inside, the first dry screw cavity (2) is provided with a cooling cavity (5) inside, a plurality of cooling pipes (6) are arranged in the cooling cavity (5), one end of the cooling pipe (6) is fixedly connected with a liquid inlet pipe (7), the liquid inlet pipe (7) is connected with the pump shell (1) penetratingly, the liquid inlet pipe (7) is arranged in the partition (4), the cooling pipe (6) is connected with a cooling pipe (26) penetratingly, the partition (4) is connected with a cooling plate (27) penetratingly, and the cooling plate (27) is provided with the cooling pipe (26).

4. The integrated dry oil-free two-stage screw vacuum pump according to claim 1, characterized in that: The pump shell (1) is provided with a first dry screw cavity (2) inside, the second dry screw cavity (3) is arranged close to the first dry screw cavity (2) inside the pump shell (1), the first dry screw cavity (2) is fixedly connected with a partition (4) inside, the first dry screw cavity (2) is provided with a cooling cavity (5) inside, a plurality of cooling pipes (6) are arranged in the cooling cavity (5), one end of the cooling pipe (6) is fixedly connected with a liquid inlet pipe (7), the liquid inlet pipe (7) is connected with the pump shell (1) penetratingly, the liquid inlet pipe (7) is arranged in the partition (4), the cooling pipe (6) is connected with a cooling pipe (26) penetratingly, the partition (4) is connected with a cooling plate (27) penetratingly, and the cooling plate (27) is provided with the cooling pipe (26).

5. The integrated dry oil-free two-stage screw vacuum pump according to claim 4, characterized in that: The pump shell (1) is provided with a first dry screw cavity (2) inside, the second dry screw cavity (3) is arranged close to the first dry screw cavity (2) inside the pump shell (1), the first dry screw cavity (2) is fixedly connected with a partition (4) inside, the first dry screw cavity (2) is provided with a cooling cavity (5) inside, a plurality of cooling pipes (6) are arranged in the cooling cavity (5), one end of the cooling pipe (6) is fixedly connected with a liquid inlet pipe (7), the liquid inlet pipe (7) is connected with the pump shell (1) penetratingly, the liquid inlet pipe (7) is arranged in the partition (4), the cooling pipe (6) is connected with a cooling pipe (26) penetratingly, the partition (4) is connected with a cooling plate (27) penetratingly, and the cooling plate (27) is provided with the cooling pipe (26).

6. The integrated dry oil-free two-stage screw vacuum pump according to claim 1, characterized in that: ​ 7. The integrated dry oil-free two-stage screw vacuum pump according to claim 1, characterized in that: ​

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