Roots vacuum pump unit

Abstract

The application relates to the technical field of vacuum pumps, and a Roots vacuum pump unit which comprises a first vacuum pump, a second vacuum pump, a connecting pipeline and a mounting rack, the first vacuum pump and the second vacuum pump are connected to the mounting rack, one end of the connecting pipeline is in communication with a gas outlet of the first vacuum pump, and the other end of the connecting pipeline is in communication with a gas inlet of the second vacuum pump. The first vacuum pump and the second vacuum pump are connected in series through the connecting pipeline, the ultimate vacuum degree of the vacuum pump is improved, and the vacuum pump unit has better vacuum pumping effect. The first vacuum pump and the second vacuum pump are fixed on the mounting rack, the correlation between the first vacuum pump and the second vacuum pump is relatively high, the dislocation vibration generated when the first vacuum pump and the second vacuum pump work is reduced, the connecting pipeline is not prone to loosening, meanwhile, the first vacuum pump and the second vacuum pump can stably work and maintain better air pumping speed.

Description

Technical Field

[0001] This application relates to the technical field of vacuum pumps, and in particular to a Roots vacuum pump unit. Background Technology

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container and create a vacuum. In other words, a vacuum pump is a device that improves, generates, and maintains a vacuum in a closed space using various methods. Within the pump chamber, the rotation of the rotor creates a volume change, expelling gas from the pump. Specifically, during the suction process, the volume of the suction chamber increases, the vacuum level decreases, and gas from the container is drawn into the pump chamber. During the exhaust process, the volume decreases, the pressure increases, and the drawn-in gas is finally expelled from the pump. However, vacuum pumps in related technologies often have low vacuum levels and small pumping capacities, severely impacting their operating efficiency. Utility Model Content

[0003] In order to improve the working efficiency of vacuum pumps, this application provides a Roots vacuum pump unit.

[0004] The Roots vacuum pump unit provided in this application adopts the following technical solution: A Roots vacuum pump unit includes a first vacuum pump, a second vacuum pump, a connecting pipe, and a mounting bracket. Both the first and second vacuum pumps are connected to the mounting bracket. One end of the connecting pipe is connected to the outlet of the first vacuum pump, and the other end of the connecting pipe is connected to the inlet of the second vacuum pump.

[0005] By adopting the above technical solution, the first and second vacuum pumps are connected in series through a connecting pipe, which improves the ultimate vacuum level of the vacuum pumps and gives the vacuum pump unit a better vacuuming effect. Fixing both the first and second vacuum pumps to the mounting bracket ensures a high degree of correlation between them, reducing misalignment and vibration during operation, preventing the connecting pipe from loosening, and ensuring stable operation of both pumps while maintaining a good pumping speed.

[0006] Preferably, the upper end of the mounting bracket is connected to a riser, the first vacuum pump is connected to the upper end of the riser, and the outlet of the first vacuum pump is higher than the inlet of the second vacuum pump.

[0007] By adopting the above technical solution, the riser makes the outlet of the first vacuum pump higher than the inlet of the second vacuum pump, which facilitates the smoother flow of gas from the first vacuum pump to the second vacuum pump under the action of gravity, further improving the pumping effect and increasing work efficiency.

[0008] Preferably, the lower end of the first vacuum pump is connected to a first support leg, the upper end of the riser is provided with a first positioning groove, the first support leg is embedded in the first positioning groove, and the side wall of the first support leg is in contact with the groove wall of the first positioning groove. The lower end of the second vacuum pump is connected to a second support leg, the upper end of the mounting bracket is provided with a second positioning groove, the second support leg is embedded in the second positioning groove, and the side wall of the second support leg is in contact with the groove wall of the second positioning groove.

[0009] By adopting the above technical solution, the first support foot is positioned by the first positioning groove and the second support foot is positioned by the second positioning groove. This helps to make the axis of the first vacuum pump outlet and the axis of the second vacuum pump inlet coplanar, which facilitates the installation of subsequent connecting pipes and improves the ease of equipment assembly.

[0010] Preferably, it also includes casters and a lifting drive cylinder. The casters are slidably connected to the mounting frame, and the sliding direction of the casters is vertical. There are a plurality of casters, which are distributed at intervals along the circumference of the mounting frame. The lifting drive cylinder is connected to the mounting frame and is used to drive the casters to slide.

[0011] By adopting the above technical solution, when movement is required, the lifting drive cylinder pushes the casters down to touch the ground, so that the lower end of the mounting frame is lifted off the ground, making it easier for workers to push the mounting frame and move the vacuum pump unit. After reaching the designated position, the lifting drive cylinder drives the casters to move, so that the lower end of the mounting frame touches the ground, reducing the possibility of the mounting frame moving due to production vibration during the operation of the first and second vacuum pumps, and improving the mobility and reliability of the equipment.

[0012] Preferably, it also includes a shock-absorbing assembly, wherein there are a plurality of shock-absorbing assemblies, which are distributed at intervals along the circumference of the mounting frame. Each shock-absorbing assembly includes a mounting base and a buffer spring. The mounting base is slidably connected to the bottom of the mounting frame, and the sliding direction of the mounting base is vertical. The mounting base is provided with a mounting hole for bolts to pass through and be fixedly connected to an external base. The buffer spring is connected between the mounting base and the mounting frame.

[0013] By adopting the above technical solution, several shock-absorbing components are arranged at intervals around the mounting frame. The mounting base is fixed to the external base by bolts. The buffer spring connects the mounting base and the mounting frame to absorb the vibration generated during the operation of the first and second vacuum pumps, reduce the vibration generated by the vacuum pump unit during operation and transmit it to the external base, and improve the working stability and efficiency of the vacuum pump unit.

[0014] Preferably, the lower end of the mounting bracket is connected to a support foot, the number of which is the same as the number of shock-absorbing components and corresponds one-to-one. The lower end of the support foot is provided with a sliding groove, and the upper end of the mounting base is connected to a sliding column. The sliding column is slidably embedded in the sliding groove, and the side wall of the sliding column is in contact with the groove wall. The shock-absorbing component also includes a rubber shock-absorbing block, which is connected to the upper end of the sliding column. The end of the rubber shock-absorbing block away from the sliding column is used to abut against the bottom of the groove.

[0015] By adopting the above technical solution, the sliding column at the upper end of the mounting base is slidably embedded in the sliding groove, which guides the sliding of the mounting base. The rubber shock absorber is connected between the sliding column and the support foot, which plays a role in buffering and shock absorption, thereby improving the working stability and efficiency of the vacuum pump unit.

[0016] Preferably, the upper end of the sliding column is provided with a groove, the rubber shock absorber is provided with a connecting hole, the connecting hole is connected to the groove, one end of the buffer spring is embedded in the groove, and the other end of the buffer spring is used to pass through the connecting hole and abut against the bottom of the sliding groove.

[0017] By adopting the above technical solution, the buffer spring is embedded in the groove, which reduces the possibility of the buffer spring shifting when the sliding column slides, thus reducing the damping performance of the buffer spring and improving the reliability of the damping component.

[0018] Preferably, the slide also includes limiting bolts. A first connecting hole is provided on one side wall of the slide along the horizontal direction, and a second connecting hole is provided on the side wall of the slide away from the first connecting hole. The axis of the second connecting hole coincides with the axis of the first connecting hole. The sliding column is provided with a limiting groove, which is connected to the first connecting hole and the second connecting hole. The number of limiting bolts is the same as the number of support feet and corresponds one-to-one. The limiting bolt passes through the first connecting hole and the limiting groove and is threadedly connected to the second connecting hole.

[0019] By adopting the above technical solution and setting a limiting bolt, which cooperates with the limiting groove, the possibility of the sliding column disengaging from the groove during the movement of the mounting bracket is reduced, resulting in the loss of the shock absorption component. In addition, the limiting bolt can be removed to facilitate the replacement or maintenance of the shock absorption component, thereby improving the service life of the shock absorption component.

[0020] Preferably, the bottom of the groove is connected to a limiting post, the buffer spring is sleeved on the outer periphery of the limiting post, the inner sidewall of the buffer spring is in contact with the outer wall of the limiting groove, and the outer sidewall of the buffer spring is in contact with the groove wall.

[0021] By adopting the above technical solution, the limiting post plays a limiting role on the buffer spring, preventing the buffer spring from shifting or shaking during operation, ensuring the stability and damping effect of the shock absorption component, and improving the working efficiency of the vacuum pump unit.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Connecting the first and second vacuum pumps in series via connecting pipes increases the ultimate vacuum level of the vacuum pumps, resulting in a better vacuum pumping effect. Fixing both the first and second vacuum pumps to the mounting bracket ensures high correlation between them, reducing misalignment and vibration during operation, preventing the connecting pipes from loosening, and ensuring stable operation of both pumps while maintaining a good pumping speed. 2. When movement is required, the lifting drive cylinder pushes the casters down to touch the ground, so that the lower end of the mounting frame is lifted off the ground, making it easier for workers to push the mounting frame and move the vacuum pump unit. After reaching the designated position, the lifting drive cylinder drives the casters to set, so that the lower end of the mounting frame touches the ground, reducing the possibility of the mounting frame moving due to production vibration during the operation of the first and second vacuum pumps, and improving the mobility and reliability of the equipment. 3. Several vibration damping components are arranged at intervals around the mounting frame. The mounting base is fixed to the external base by bolts. The buffer spring connects the mounting base and the mounting frame to absorb the vibration generated during the operation of the first and second vacuum pumps, reduce the vibration generated by the vacuum pump unit during operation and transmit it to the external base, and improve the working stability and efficiency of the vacuum pump unit. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a Roots vacuum pump unit.

[0024] Figure 2 This is a partial sectional view of a Roots vacuum pump unit.

[0025] Explanation of reference numerals in the attached figures: 1. Mounting bracket; 11. Base frame; 111. Second positioning groove; 12. Support leg; 121. Slide groove; 122. First connecting hole; 123. Second connecting hole; 124. Embedded groove; 125. Limiting post; 13. Elevator frame; 131. First positioning groove; 2. First vacuum pump; 21. First support leg; 3. Second vacuum pump; 31. Second support leg; 4. Connect the pipes; 5. Shock-absorbing components; 51. Mounting base; 511. Sliding column; 5111. Limiting groove; 5112. Groove; 512. Mounting hole; 52. Buffer spring; 53. Rubber shock absorber block; 531. Connecting hole; 6. Limit bolts; 7. Moving mechanism; 71. Lifting seat; 711. Connecting block; 72. Lifting drive cylinder; 73. Casters. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] Reference Figure 1 This application discloses a Roots vacuum pump unit including a mounting frame 1. The mounting frame 1 includes a base frame 11, support legs 12, and an extension frame 13. The lower end of the extension frame 13 is fixedly connected to the upper end of the base frame 11. One surface of the extension frame 13 along its width direction is flush with one surface of the base frame 11 along its length direction. The upper end of the support legs 12 is fixedly connected to the lower end of the base frame 11. The length direction of the support legs 12 is vertical, and there are several support legs 12, which are distributed at intervals around the circumference of the base frame 11. In this embodiment, there are six support feet 12, which are divided into two groups. The two groups of support feet 12 are symmetrically distributed along the width direction of the base frame 11. The surface of the support foot 12 away from the other group of support feet 12 is flush with the surface of the base frame 11 along the width direction. The three support feet 12 in the same group are evenly distributed along the length direction of the base frame 11. The surface of the support feet 12 in the same group located on both sides of the length direction of the base frame 11 away from the other two support feet 12 in the same group is flush with the surface of the base frame 11 along the length direction.

[0028] A Roots vacuum pump unit further includes a first vacuum pump 2, a second vacuum pump 3, and a connecting pipe 4. The second vacuum pump 3 is fixedly connected to the upper end of the base frame 11, and its length direction is parallel to the length direction of the riser frame 13. The second vacuum pump 3 is a Roots vacuum pump. The air inlet of the second vacuum pump 3 is located at the upper end of the second vacuum pump 3, and the air outlet of the second vacuum pump 3 is located on the side of the second vacuum pump 3 away from the riser frame 13. Four second support legs 31 are fixedly connected to the lower end of the second vacuum pump 3. The four second support legs 31 are divided into two groups, and the two groups of second support legs 31 are symmetrically distributed along the width direction of the second vacuum pump 3. The two second support legs 31 in the same group are symmetrically distributed along the length direction of the second vacuum pump 3. The upper end of the base frame 11 is provided with a second positioning groove 111, and the second support legs 31 are embedded in the second positioning groove 111. The side wall of the second support leg 31 is in contact with the groove wall of the second positioning groove 111. The second support leg 31 is provided with a second fixing hole for bolts to pass through and be fixedly connected to the base frame 11. The first vacuum pump 2 is fixedly connected to the upper end of the riser frame 13. The length direction of the first vacuum pump 2 is parallel to the length direction of the riser frame 13. The first vacuum pump 2 is a Roots vacuum pump. The air inlet of the first vacuum pump 2 is located at the upper end of the first vacuum pump 2, and the air outlet of the first vacuum pump 2 is located on the side of the first vacuum pump 2 closer to the second vacuum pump 3. The air outlet of the first vacuum pump 2 is higher than the air inlet of the second vacuum pump 3. Four first support legs 21 are fixedly connected to the lower end of the first vacuum pump 2. The four first support legs 21 are divided into two groups. The two groups of first support legs 21 are symmetrically distributed along the width direction of the first vacuum pump 2, and the two first support legs 21 in the same group are symmetrically distributed along the length direction of the first vacuum pump 2. The lower end of the riser frame 13 is provided with a first positioning groove 131. The first support legs 21 are embedded in the first positioning groove 131, and the side wall of the first support leg 21 is in contact with the groove wall of the first positioning groove 131. The first support leg 21 is provided with a first fixing hole for bolts to pass through and be fixedly connected to the riser frame 13. One end of the connecting pipe 4 is fixedly connected to the first vacuum pump 2, and the other end of the connecting pipe 4 is fixedly connected to the second vacuum pump 3. The connecting pipe 4 connects the outlet of the first vacuum pump 2 and the inlet of the second vacuum pump 3.

[0029] Reference Figure 1 and Figure 2A Roots vacuum pump unit also includes a shock-absorbing component 5 and a limiting bolt 6. The number of shock-absorbing components 5 is the same as the number of support legs 12 and they correspond one-to-one. The shock-absorbing component 5 includes a mounting base 51, which is slidably connected to the lower end of the support leg 12. The sliding direction of the mounting base 51 is vertical. The lower end of the support leg 12 is provided with a sliding groove 121. The upper end of the mounting base 51 is fixedly connected with a sliding column 511, which is slidably embedded in the sliding groove 121. The side wall of the sliding column 511 is in contact with the groove wall of the sliding groove 121. The mounting base 51 is provided with two mounting holes 512, which are symmetrically distributed along the width direction of the base frame 11. The mounting holes 512 are used for bolts to pass through and be fixedly connected to the external base. A first connecting hole 122 is provided on the side wall of the slide groove 121 away from the other set of support feet 12, and a second connecting hole 123 is provided on the side wall of the slide groove 121 near the other set of support feet 12. The axis of the second connecting hole 123 coincides with the axis of the first connecting hole 122. The sliding column 511 is provided with a limiting groove 5111, which connects the first connecting hole 122 and the second connecting hole 123. The limiting bolt 6 passes through the first connecting hole 122 and the limiting groove 5111 and is threadedly connected to the second connecting hole 123. A groove 124 is provided on the wall of the first connecting hole 122 away from the second connecting hole 123, which is used for the head of the limiting bolt 6 to be inserted.

[0030] The shock absorption assembly 5 also includes a buffer spring 52 and a rubber damping block 53. The rubber damping block 53 is fixedly connected to the upper end of the sliding column 511, and the end of the rubber damping block 53 away from the sliding column 511 is used to abut against the bottom of the groove 121. The upper end of the sliding column 511 is provided with a groove 5112, and the rubber damping block 53 is provided with a connecting hole 531, which is connected to the groove 5112. One end of the buffer spring 52 is fixedly connected to the bottom of the groove 5112, and the outer wall of the buffer spring 52 is in contact with the groove wall of the groove 5112. The other end of the buffer spring 52 is used to pass through the connecting hole 531 and abut against the bottom of the groove 121. A limiting post 125 is fixedly connected to the bottom of the groove 121. The end of the limiting post 125 away from the bottom of the groove 121 is used to extend into the connecting hole 531. The buffer spring 52 is sleeved on the outer periphery of the limiting post 125, and the inner wall of the buffer spring 52 is in contact with the outer wall of the limiting post 125.

[0031] Reference Figure 1A Roots vacuum pump unit also includes a moving mechanism 7, which includes a lifting seat 71, a lifting drive cylinder 72, and casters 73. The lifting seat 71 is slidably connected to the support leg 12, and the sliding direction of the lifting seat 71 is vertical. The lifting seat 71 is annular, and the inner sidewall of the lifting seat 71 is in contact with the sidewall of the support leg 12. Two connecting blocks 711 are fixedly connected to the inner sidewall of the lifting seat 71, and the two connecting blocks 711 are symmetrically distributed along the length of the base frame 11. The number of lifting drive cylinders 72 is the same as the number of connecting blocks 711 and corresponds one-to-one. The lifting drive cylinders 72 are connected to the base frame 11 and are used to drive the lifting seat 71 to slide. In this embodiment, the lifting drive cylinder 72 is a hydraulic cylinder. The cylinder body of the lifting drive cylinder 72 is fixedly connected to the lower end of the base frame 11, and the piston rod of the lifting drive cylinder 72 is fixedly connected to the side surface of the connecting block 711 near the base frame 11. The casters 73 are fixedly connected to the lower end of the lifting seat 71. There are four casters 73, which are divided into two groups. The two groups of casters 73 are symmetrically distributed along the length of the base frame 11, and the two casters 73 in the same group are symmetrically distributed along the width of the base frame 11.

[0032] The implementation principle of a Roots vacuum pump unit in this application embodiment is as follows: During assembly, the piston rod of the lifting drive cylinder 72 extends, pushing the lifting seat 71 to move down, which in turn drives the universal wheel 73 to move down. The universal wheel 73 abuts against the ground, causing the lower end of the support foot 12 to separate from the ground. The rubber shock absorber 53 is connected to the upper end of the sliding column 511, and the buffer spring 52 is embedded in the groove 5112. The upper end of the sliding column 511 is slidably embedded in the sliding groove 121, and the buffer spring 52 is sleeved on the outer periphery of the limiting column 125, pushing the mounting seat 51 to move up, so that the limiting groove 5111 is connected to the first connecting hole 122 and the second connecting hole 123. The limiting bolt 6 passes through the first connecting hole 122 and the limiting groove 5111 and is threadedly connected to the second connecting hole 123. The piston rod of the lifting drive cylinder 72 retracts, causing the lifting seat 71 to move upward, which in turn causes the caster wheel 73 to move upward. When the lower end of the mounting base 51 touches the ground, the caster wheel 73 separates from the ground, and the rubber shock absorber 53 and the buffer spring 52 both abut against the bottom of the sliding groove 121. The first support leg 21 of the first vacuum pump 2 is embedded in the first positioning groove 131, and the bolt passes through the first fixing hole and is threadedly connected to the riser frame 13 to achieve a fixed connection between the first vacuum pump 2 and the riser frame 13. The second support leg 31 of the second vacuum pump 3 is embedded in the second positioning groove 111, and the bolt passes through the second fixing hole and is threadedly connected to the base frame 11 to achieve a fixed connection between the second vacuum pump 3 and the base frame 11. The two ends of the connecting pipe 4 are respectively connected to the air outlet of the first vacuum pump 2 and the air inlet of the second vacuum pump 3.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A Roots vacuum pump unit, characterized by: It includes a first vacuum pump (2), a second vacuum pump (3), a connecting pipe (4), and a mounting bracket (1); the first vacuum pump (2) and the second vacuum pump (3) are both connected to the mounting bracket (1); one end of the connecting pipe (4) is connected to the outlet of the first vacuum pump (2); the other end of the connecting pipe (4) is connected to the inlet of the second vacuum pump (3).

2. - Roots vacuum pump set according to claim 1, characterized in that: The mounting bracket (1) is connected to a riser bracket (13) at its upper end; the first vacuum pump (2) is connected to the upper end of the riser bracket (13); the outlet of the first vacuum pump (2) is higher than the inlet of the second vacuum pump (3).

3. The Roots vacuum pump unit according to claim 2, characterized in that: The first vacuum pump (2) is connected to a first support leg (21) at its lower end; the upper end of the riser (13) is provided with a first positioning groove (131); the first support leg (21) is embedded in the first positioning groove (131); the side wall of the first support leg (21) is in contact with the groove wall of the first positioning groove (131); the second vacuum pump (3) is connected to a second support leg (31) at its lower end; the upper end of the mounting bracket (1) is provided with a second positioning groove (111); the second support leg (31) is embedded in the second positioning groove (111); the side wall of the second support leg (31) is in contact with the groove wall of the second positioning groove (111).

4. The Roots vacuum pump unit according to claim 1, characterized in that: It also includes casters (73) and lifting drive cylinders (72); the casters (73) are slidably connected to the mounting frame (1); the sliding direction of the casters (73) is vertical; there are several casters (73); the casters (73) are distributed circumferentially along the mounting frame (1); the lifting drive cylinders (72) are connected to the mounting frame (1); the lifting drive cylinders (72) are used to drive the casters (73) to slide.

5. The Roots vacuum pump unit according to claim 4, characterized in that: It also includes a shock-absorbing component (5); the shock-absorbing component (5) is provided in several parts; the several shock-absorbing components (5) are distributed circumferentially along the mounting frame (1); the shock-absorbing component (5) includes a mounting base (51) and a buffer spring (52); the mounting base (51) is slidably connected to the bottom of the mounting frame (1); the sliding direction of the mounting base (51) is vertical; the mounting base (51) is provided with a mounting hole (512); the mounting hole (512) is used for bolts to pass through and be fixedly connected to the external base; the buffer spring (52) is connected between the mounting base (51) and the mounting frame (1).

6. The Roots vacuum pump unit according to claim 5, characterized in that: The mounting bracket (1) is connected to a support foot (12) at its lower end; the number of support feet (12) is the same as the number of shock-absorbing components (5) and they correspond one-to-one; the lower end of the support foot (12) is provided with a sliding groove (121); the upper end of the mounting base (51) is connected to a sliding column (511); the sliding column (511) is slidably embedded in the sliding groove (121); the side wall of the sliding column (511) is in contact with the groove wall of the sliding groove (121); the shock-absorbing component (5) also includes a rubber shock-absorbing block (53); the rubber shock-absorbing block (53) is connected to the upper end of the sliding column (511); the end of the rubber shock-absorbing block (53) away from the sliding column (511) is used to abut against the bottom of the groove (121).

7. The Roots vacuum pump unit according to claim 6, characterized in that: The upper end of the sliding column (511) is provided with a groove (5112); the rubber damping block (53) is provided with a connecting hole (531); the connecting hole (531) is connected to the groove (5112); one end of the buffer spring (52) is embedded in the groove (5112); the other end of the buffer spring (52) is used to pass through the connecting hole (531) and abut against the bottom of the groove (121).

8. The Roots vacuum pump unit according to claim 7, characterized in that: It also includes limiting bolts (6); the slide groove (121) has a first connecting hole (122) on one side of the groove wall along the horizontal direction; the slide groove (121) has a second connecting hole (123) on the groove wall away from the first connecting hole (122); the axis of the second connecting hole (123) coincides with the axis of the first connecting hole (122); the sliding column (511) has a limiting groove (5111); the limiting groove (5111) is connected to the first connecting hole (122) and the second connecting hole (123); the number of limiting bolts (6) is the same as the number of support feet (12) and corresponds one-to-one; the limiting bolts (6) pass through the first connecting hole (122) and the limiting groove (5111) and are threaded to the second connecting hole (123).

9. The Roots vacuum pump unit according to claim 8, characterized in that: The bottom of the groove (121) is connected to a limiting post (125); the buffer spring (52) is sleeved on the outer periphery of the limiting post (125); the inner side wall of the buffer spring (52) is in contact with the outer wall of the limiting groove (5111); the outer side wall of the buffer spring (52) is in contact with the groove wall (5112).

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