Dual motor screw vacuum pump with rotor built-in cooling

Abstract

The utility model discloses a kind of double-motor screw vacuum pumps of built-in cooling of rotor, it is related to screw vacuum pump technical field, including fixed seat, the fixed seat top is equipped with chute, its bottom is installed cooling liquid circulation tank;The middle part of the chute is fixedly installed fixed frame, the both ends of chute are slidably installed sliding seat, the top of two sliding seats is fixed motor shell assembly, and rotor shaft is rotatably installed in motor shell assembly inside.The utility model described a kind of double-motor screw vacuum pumps of built-in cooling of rotor, and the cooling of efficiency rotor is cooled: cooling liquid directly flows through rotor shaft and spiral blade connecting port, realizes the accurate cooling to high temperature area, reduces the deformation caused by thermal stress, prolongs rotor life, and the linkage design of hydraulic cylinder and sliding seat can real-time adjustment rotor axial position, offsets thermal expansion in operation or assembly error, reduces wear risk, and the rubber pipeline soft connection of intercommunication mechanism adapts to the slight vibration when rotor rotates, and metal connecting fastener guarantees the sealing of high-pressure cooling liquid.

Description

Technical Field

[0001] This utility model relates to the field of screw vacuum pump technology, and in particular to a dual-motor screw vacuum pump with built-in rotor cooling. Background Technology

[0002] Screw vacuum pumps are non-contact dry pumps, an ideal type of pump that emerged in the early 1990s. They are widely used due to their wide pumping speed range, simple and compact structure, frictionless pumping chamber components, long lifespan, low energy consumption, and oil-free operation. However, under high loads, traditional screw vacuum pumps are prone to localized overheating due to rotor friction and heat generated by compressed gas, affecting sealing performance and shortening service life. Existing cooling solutions mostly rely on external air cooling or circulating water cooling, which suffers from low cooling efficiency, complex structure, and difficulty in accurately controlling temperature distribution. Furthermore, while dual-motor drive designs can improve pumping efficiency, the coordinated operation of the motor and rotor can easily generate uneven axial forces, leading to accelerated rotor wear. This patent aims to solve technical problems such as high-temperature rotor buildup, axial alignment misalignment, and lag in cooling system response by incorporating a built-in cooling circuit and dynamic adjustment mechanism. Utility Model Content

[0003] The main objective of this invention is to provide a dual-motor screw vacuum pump with built-in rotor cooling, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A dual-motor screw vacuum pump with built-in rotor cooling includes a fixed base, the top of which is provided with a sliding groove, and the bottom of which is equipped with a coolant circulation tank;

[0006] A fixing frame is fixedly installed in the middle of the chute, and sliding seats are slidably installed at both ends of the chute. The motor housing assembly is fixed on the top of the two sliding seats, and the rotor shaft is rotatably installed inside the motor housing assembly.

[0007] The top of the fixed frame is fixed to the vacuum pump housing, and the vacuum pump auger blades and screws that mesh with each other are rotatably installed inside the housing.

[0008] The rotor shaft is fixedly sleeved with a first six-jaw clamping block and a second six-jaw clamping block. The second six-jaw clamping block has a fifth channel communicating with the shaft center and a number of sixth channels communicating with adjacent clamping jaws. The first six-jaw clamping block has a third channel communicating with the shaft center and a number of fourth channels communicating with adjacent clamping jaws.

[0009] The sixth and fourth adjacent channels are provided with snap-fit ​​slots, which are connected by a connecting mechanism.

[0010] The rotor shaft is internally provided with a first channel and a second channel. The first channel is connected to a fifth channel, and the second channel is connected to a third channel. A coolant circuit is formed through the fifth channel, the third channel, the sixth channel, and the fourth channel.

[0011] The screw is fixedly connected to the spiral blade connection port at both ends. The port passes through the side wall of the screw vacuum pump housing and is connected to the rotor output end. The screw has a through groove inside that communicates with the second channel.

[0012] Preferably, hydraulic cylinders are fixed on both sides of the fixing frame, the sliding seat has a cavity inside, and the telescopic end of the hydraulic cylinder is fixedly connected to the inner wall of the cavity.

[0013] Preferably, a coil is mounted on the rotor shaft, and the coil is located between the first six-jaw clamping block and the second six-jaw clamping block.

[0014] Preferably, the connecting mechanism includes a pair of metal connecting fasteners, with a metal pipe fixed between each pair of fasteners, and a rubber pipe flexible joint connecting adjacent metal pipes, wherein the metal connecting fasteners are fixed in the snap-fit ​​groove.

[0015] Preferably, a first pipe rotating connector is installed at the opposite ends of the two rotor shafts, a fixing ring is fixed inside the motor housing assembly, the first pipe rotating connector is embedded in the fixing ring, and its outer end is connected to a pressure-resistant heat-insulating hose.

[0016] Preferably, the pressure-resistant and heat-insulating hose on the left is connected to the inlet of the filter assembly, and the pressure-resistant and heat-insulating hose on the right is connected to the inner cavity of the coolant circulation tank;

[0017] A circulation pump is installed on the side wall of the coolant circulation tank, and its output end is connected to the outlet of the filter assembly. A check valve is installed inside the pressure-resistant and heat-insulating hose.

[0018] Preferably, the input end of the circulation pump is connected to an "L"-shaped pipe through a second pipe rotating connector, and the "L"-shaped pipe extends into the coolant circulation tank and is fitted with a first gear;

[0019] A servo motor is installed on the side wall of the coolant circulation tank, and a second gear is fixed to its output end. The second gear meshes with the first gear.

[0020] The coolant circulation tank is equipped with a maximum water level line, and refrigeration components are installed on its two side walls. The refrigeration end of the refrigeration component is located below the maximum water level line.

[0021] Preferably, the fixed base has fixed support legs on both sides of its bottom.

[0022] Preferably, temperature measuring components are mounted on the outer surfaces of the two motor housing assemblies.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. High-efficiency rotor cooling: The coolant flows directly through the rotor shaft and the connection port of the spiral blades, achieving precise cooling of high-temperature areas, reducing deformation caused by thermal stress, and extending rotor life.

[0025] 2. Dynamic axial compensation: The linkage design of the hydraulic cylinder and the sliding seat can adjust the axial position of the rotor in real time to offset thermal expansion or assembly errors during operation and reduce the risk of wear.

[0026] 3. Flexible sealing and vibration resistance: The rubber pipe flexible joint of the connecting mechanism adapts to the slight vibration when the rotor rotates, while the metal connecting fastener ensures the sealing of the high-pressure coolant.

[0027] 4. Modular cooling system: The combination of pressure-resistant heat-insulating hoses and rotating connectors for the first and second pipes solves the problem of connecting rotating components to fixed cooling circuits and simplifies the maintenance process.

[0028] 5. Intelligent temperature control and liquid level management: The linkage between the servo motor and the gear set can dynamically adjust the coolant flow direction. Combined with the zoned temperature control of the refrigeration components, it ensures stable operation of the system under a wide range of operating conditions. Attached Figure Description

[0029] Figure 1 This is a first three-dimensional structural schematic diagram of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model;

[0030] Figure 2 This is a first three-dimensional structural schematic diagram of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model;

[0031] Figure 3 This is a three-dimensional structural diagram of the housing of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0032] Figure 4 This is a three-dimensional structural diagram of the first and second six-jaw clamping blocks of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0033] Figure 5 This is a three-dimensional structural diagram of the rotor shaft of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0034] Figure 6 This is a cross-sectional schematic diagram of the rotor shaft of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0035] Figure 7 This is a three-dimensional structural diagram of the first six-jaw clamping block of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0036] Figure 8 This is a three-dimensional structural diagram of the mounting groove for the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0037] Figure 9 This is a cross-sectional view of the second six-jaw clamping block of the dual-motor screw vacuum pump with built-in rotor cooling according to the present invention, with respect to the fifth channel.

[0038] Figure 10 This is a cross-sectional view of the sixth channel of the second six-jaw clamping block of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0039] Figure 11 This is a cross-sectional view of the first six-jaw clamping block of the dual-motor screw vacuum pump with built-in rotor cooling according to the present invention, with respect to the third channel.

[0040] Figure 12 This is a cross-sectional view of the first six-jaw clamping block of the dual-motor screw vacuum pump with built-in rotor cooling according to the present invention, with respect to the fourth channel.

[0041] Figure 13 This is a schematic diagram of the internal structure of the coolant circulation tank of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0042] Figure 14 This is a three-dimensional structural diagram of the connecting mechanism of the dual-motor screw vacuum pump with built-in rotor cooling according to this utility model.

[0043] In the diagram: 1. Fixed base; 2. Support leg; 3. Coolant circulation tank; 301. Refrigeration component; 302. First gear; 303. Second gear; 304. Steering motor; 305. "L"-shaped pipe; 306. Highest water level line; 4. Pressure-resistant heat-insulating hose; 5. Motor housing assembly; 6. Hydraulic cylinder; 7. Fixed frame; 8. Sliding seat; 801. Cavity; 9. Screw vacuum pump housing; 10. Temperature measuring component; 11. Filter assembly; 12. Circulation pump; 13. Spiral blade connection port; 14. Rotor output end; 15. Rotor shaft; 1501. First channel; 1502. Second channel; 16. First six-jaw clamping block; 1601. Third channel; 1602. Fourth channel; 17. Second six-jaw clamping block; 1701. Fifth channel; 1702. Sixth channel; 18. Connecting mechanism; 1801. Metal connecting fastener; 1802. Metal pipe; 1803. Rubber pipe flexible joint; 19. Fixing ring; 20. First pipe rotating connector; 21. Snap-fit ​​groove. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0045] like Figure 1-14 As shown, a dual-motor screw vacuum pump with built-in rotor cooling includes a fixed base 1, the top of which is provided with a sliding groove, and the bottom of which is equipped with a coolant circulation tank 3.

[0046] A fixing bracket 7 is fixedly installed in the middle of the chute, and sliding seats 8 are slidably installed at both ends of the chute. The motor housing assembly 5 is fixed on the top of the two sliding seats 8, and the rotor shaft 15 is rotatably installed inside the motor housing assembly 5.

[0047] The top of the fixed frame 7 is fixed to the vacuum pump housing 9, and the vacuum pump spiral blades and screws that mesh with each other are rotatably installed inside the frame 7.

[0048] A first six-jaw clamping block 16 and a second six-jaw clamping block 17 are fixedly sleeved on the rotor shaft 15. The second six-jaw clamping block 17 has a fifth channel 1701 that connects to the shaft center and a number of sixth channels 1702 that connect to adjacent clamping jaws. The first six-jaw clamping block 16 has a third channel 1601 that connects to the shaft center and a number of fourth channels 1602 that connect to adjacent clamping jaws.

[0049] The sixth channel 1702 and the fourth channel 1602 are provided with a snap-fit ​​groove 21, which is connected by a connecting mechanism 18.

[0050] The rotor shaft 15 has a first channel 1501 and a second channel 1502 running through it. The first channel 1501 is connected to the fifth channel 1701, and the second channel 1502 is connected to the third channel 1601. A coolant circuit is formed through the fifth channel 1701, the third channel 1601, the sixth channel 1702 and the fourth channel 1602.

[0051] The screw is fixedly connected to the spiral blade connection port 13 at both ends. This port passes through the side wall of the screw vacuum pump housing 9 and is connected to the rotor output end 14. The screw has a through groove inside that communicates with the second channel 1502.

[0052] In this embodiment, hydraulic cylinders 6 are fixed on both sides of the fixing frame 7, and a cavity 801 is provided inside the sliding seat 8. The telescopic end of the hydraulic cylinder 6 is fixedly connected to the inner wall of the cavity 801. The hydraulic cylinder 6 pushes the sliding seat 8 through the cavity 801 to achieve precise adjustment of the motor spacing and adapt to the replacement of screws of different sizes. In this embodiment, a coil is installed on the rotor shaft 15, and the coil is located between the first six-jaw clamping block 16 and the second six-jaw clamping block 17. The coil is placed between the first six-jaw clamping block 16 and the second six-jaw clamping block 17, and the electromagnetic components are actively cooled by the surrounding structure of the cooling channel. The dual motor housing assembly 5 is installed in the top groove of the fixing seat 1, the rotor shaft 15 has a built-in cooling channel, and the coil is located between the six-jaw clamping blocks. After the dual motors are started, the hydraulic cylinder 6 adjusts the motor position according to the data of the temperature measuring component 10, the coolant circulates through the internal channel of the rotor shaft, and the coil assists in balancing the dynamic load of the rotor.

[0053] In this embodiment, the connecting mechanism 18 includes paired metal connecting fasteners 1801, with a metal pipe 1802 fixed between each pair of fasteners. Adjacent metal pipes 1802 are connected by rubber hose flexible joints 1803. The metal connecting fasteners 1801 are fixed within the snap-fit ​​groove 21. The metal connecting fasteners 1801 ensure a rigid connection of the pipes, while the rubber hose flexible joints 1803 compensate for rotor vibration displacement. The metal connecting fasteners 1801 are located inside the first six-jaw clamping block 16 and the second six-jaw clamping block 17, preventing them from dislodging during rotation and ensuring a stable connection.

[0054] In this embodiment, a first pipe rotating connector 20 is installed at the opposite ends of the two rotor shafts 15. A fixing ring 19 is fixed inside the motor housing assembly 5. The first pipe rotating connector 20 is embedded in the fixing ring 19, and its outer end is connected to a pressure-resistant heat-insulating hose 4. The first pipe rotating connector 20 is embedded in the fixing ring 19, which solves the problem of sealing and conduction between the rotating shaft and the fixed pipeline.

[0055] In this embodiment, the left pressure-resistant and heat-insulating hose 4 is connected to the inlet of the filter assembly 11, and the right pressure-resistant and heat-insulating hose 4 is connected to the inner cavity of the coolant circulation tank 3.

[0056] A circulation pump 12 is installed on the side wall of the coolant circulation tank 3, and its output end is connected to the outlet of the filter assembly 11. A check valve is installed inside the pressure-resistant and heat-insulating hose 4. The check valve prevents coolant backflow, and the filter assembly 11 intercepts metal wear particles. The metal pipe 1802 of the connecting mechanism 18 is connected to the adjacent clamps via a rubber flexible joint 1803, and the pressure-resistant hose 4 connects the circulation tank 3 and the filter assembly 11. After the circulation pump 12 starts, the coolant enters the rotor cooling circuit after filtration, and the rubber flexible joint 1803 absorbs the vibration generated by the rotor rotation.

[0057] In this embodiment, the input end of the circulating pump 12 is connected to the "L"-shaped pipe 305 through the second pipe rotating connector. The "L"-shaped pipe 305 extends into the coolant circulation tank 3 and is sleeved with the first gear 302.

[0058] A servo motor 304 is installed on the side wall of the coolant circulation tank 3, and a second gear 303 is fixed at its output end. The second gear 303 meshes with the first gear 302.

[0059] The coolant circulation tank 3 has a maximum water level line 306, and refrigeration components 301 are installed on its two side walls. The cooling end of the refrigeration components 301 is located below the maximum water level line 306. A gear set allows for pipe angle adjustment from 0° to 90°, ensuring stable liquid intake at different liquid levels. Furthermore, when maintenance is required, adjusting the "L"-shaped pipe 305 to the top of the maximum water level line 306 allows for the drainage of coolant from all top channels, facilitating maintenance.

[0060] In this embodiment, support legs 2 are fixed on both sides of the bottom of the fixed base 1. The support legs 2 are provided with space for anchor bolts to enhance the vibration resistance of the equipment.

[0061] In this embodiment, temperature sensing components 10 are installed on the outer surfaces of the two motor housing assemblies 5. The temperature sensing components 10 provide real-time temperature feedback to the PLC, triggering the refrigeration assembly 301 to start in stages. The coolant circulation tank 3 contains a servo motor 304 and the refrigeration assembly 301, with support legs 2 enhancing stability. The temperature sensing components 10 monitor the motor temperature in real time. When the temperature is too high, the PLC controls the servo motor 304 to adjust the position of the "L"-shaped pipe 305 to increase the coolant flow; the refrigeration assembly 301 starts, maintaining the temperature inside the tank below 40°C.

[0062] Working principle: Coolant circulation path: Coolant enters the first channel 1501 and the second channel 1502 of the rotor shaft 15 through the pressure-resistant heat-insulating hose 4 from the coolant circulation tank 3. It then forms a closed loop through the fifth channel 1701, the third channel 1601 and the fourth / sixth channel 1602 / 1702 of the six-jaw clamping block, and finally returns to the circulation tank.

[0063] Dynamic axial adjustment: The hydraulic cylinder 6 drives the sliding seat 8 to move along the slide groove, adjusting the axial alignment of the rotor shaft 15 with the screw vacuum pump housing 9 to compensate for deviations caused by thermal expansion or wear.

[0064] Flexible connection and sealing: The metal pipe 1802 and rubber flexible joint 1803 of the connecting mechanism 18 ensure that the adjacent gripper channels remain sealed when the rotor rotates, preventing coolant leakage.

[0065] System control process: Temperature sensing component 10 monitors the motor housing temperature in real time, triggering circulation pump 12 to start or adjust flow rate;

[0066] The servo motor 304 drives the second gear 303 to mesh with the first gear 302, rotating the "L"-shaped pipe 305 to switch the direction of coolant inlet and optimize the liquid level distribution in the circulation tank; the refrigeration component 301 starts according to the temperature signal to maintain the coolant at a constant temperature below the highest water level line 306.

[0067] The circuits, electronic components, and control modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dual motor screw vacuum pump with rotor- in- cooling, characterized in that: Includes a fixed base (1), the top of which is provided with a sliding groove and the bottom of which is equipped with a coolant circulation tank (3); The middle part of the slide is fixedly installed with a fixing bracket (7), and the two ends of the slide are slidably installed with sliding seats (8). The top of the two sliding seats (8) is fixed with a motor housing assembly (5), and the rotor shaft (15) is rotatably installed inside the motor housing assembly (5). The top of the fixed frame (7) is fixed to the vacuum pump housing (9), and the vacuum pump spiral blades and screws that mesh with each other are rotatably installed inside it; The rotor shaft (15) is fixedly sleeved with a first six-jaw clamping block (16) and a second six-jaw clamping block (17). The second six-jaw clamping block (17) has a fifth channel (1701) connecting to the shaft center and a number of sixth channels (1702) connecting adjacent clamping jaws. The first six-jaw clamping block (16) has a third channel (1601) connecting to the shaft center and a number of fourth channels (1602) connecting adjacent clamping jaws. The sixth channel (1702) and the fourth channel (1602) are provided with snap-fit ​​slots (21), which are connected by a connecting mechanism (18); The rotor shaft (15) is internally provided with a first channel (1501) and a second channel (1502). The first channel (1501) is connected to the fifth channel (1701), and the second channel (1502) is connected to the third channel (1601). A coolant circuit is formed through the fifth channel (1701), the third channel (1601), the sixth channel (1702), and the fourth channel (1602). The screw is fixedly connected to the spiral blade connection port (13) at both ends. This port passes through the side wall of the screw vacuum pump housing (9) and is connected to the rotor output end (14).

2. The dual motor screw vacuum pump with rotor-in-can cooling of claim 1, wherein: The fixed frame (7) has hydraulic cylinders (6) fixed on both sides, and the sliding seat (8) has a cavity (801) inside. The telescopic end of the hydraulic cylinder (6) is fixedly connected to the inner wall of the cavity (801).

3. The dual motor screw vacuum pump with rotor-in-can cooling of claim 1, wherein: A coil is mounted on the rotor shaft (15), and the coil is located between the first six-jaw clamping block (16) and the second six-jaw clamping block (17).

4. The dual motor screw vacuum pump with rotor-in-can cooling of claim 1, wherein: The connecting mechanism (18) includes a pair of metal connecting fasteners (1801), a metal pipe (1802) is fixed between each pair of fasteners, and a rubber pipe flexible joint (1803) is connected between adjacent metal pipes (1802). The metal connecting fasteners (1801) are fixed in the snap-fit ​​groove (21).

5. The rotor-injected-cooled dual-motor screw vacuum pump of claim 1, wherein: The first pipe rotating connector (20) is installed on the opposite ends of the two rotor shafts (15). A fixing ring (19) is fixed inside the motor housing assembly (5). The first pipe rotating connector (20) is embedded in the fixing ring (19), and its outer end is connected to the pressure-resistant heat-insulating hose (4).

6. The dual-motor screw vacuum pump with built-in rotor cooling according to claim 5, characterized in that: The pressure-resistant and heat-insulating hose (4) on the left is connected to the inlet of the filter assembly (11), and the pressure-resistant and heat-insulating hose (4) on the right is connected to the inner cavity of the coolant circulation tank (3); The coolant circulation tank (3) has a circulation pump (12) installed on its side wall, and its output end is connected to the outlet of the filter assembly (11). The pressure-resistant heat-insulating hose (4) is equipped with a check valve.

7. The dual-motor screw vacuum pump with built-in rotor cooling according to claim 6, characterized in that: The input end of the circulating pump (12) is connected to an "L"-shaped pipe (305) through a second pipe rotating connector. The "L"-shaped pipe (305) extends into the coolant circulation tank (3) and is fitted with a first gear (302). The coolant circulation tank (3) has a servo motor (304) installed on its side wall, and a second gear (303) is fixed at its output end. The second gear (303) meshes with the first gear (302). The coolant circulation tank (3) is provided with a maximum water level line (306), and refrigeration components (301) are installed on its two side walls. The refrigeration end of the refrigeration component (301) is located below the maximum water level line (306).

8. The dual-motor screw vacuum pump with built-in rotor cooling according to claim 1, characterized in that: The fixed base (1) has fixed support legs (2) on both sides of its bottom.

9. The dual-motor screw vacuum pump with built-in rotor cooling according to claim 1, characterized in that: Temperature measuring components (10) are mounted on the outer surfaces of the two motor housing assemblies (5).

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