A quick start and stop device for preventing cavitation of a vacuum exhaust pump

Abstract

The anti-cavitation quick start-stop device of the vacuum exhaust pump can realize an anti-cavitation mechanism in a starting stage, can realize turbulence suppression and flow guiding, can realize an anti-backflow mechanism in a stopping stage, and can realize a quick start-stop function.

Description

Technical Field

[0001] This utility model relates to the field of anti-cavitation technology, and in particular to an anti-cavitation rapid start-stop device for a vacuum suction pump. Background Technology

[0002] After starting, the vacuum pump creates negative pressure inside the pump through impeller rotation and vacuum device, causing liquid and gas to be drawn in and discharged simultaneously, completing the three actions of liquid suction, gas discharge and water pumping almost at the same time.

[0003] When a vacuum pump starts, the pressure inside the pump chamber drops rapidly. If the liquid being drawn in is not replenished in time or the pressure drops too quickly, the liquid is very likely to vaporize at the pump inlet, generating bubbles. When the bubbles enter the high-pressure zone inside the pump with the liquid, they quickly collapse, generating violent shock waves and micro-jet streams. This can cause cavitation damage to components such as the pump body and impeller, resulting in noise and vibration, and shortening the pump's service life.

[0004] When a vacuum pump stops, if there is positive pressure or a high liquid column, the liquid may backflow into the pump chamber, which may not only damage the pump, but also increase the risk of cavitation when it is started again. In addition, to prevent cavitation, it is usually necessary to start slowly or use a complex pre-vacuum system, which prolongs the start-up time and cannot meet the requirements of rapid response, resulting in low start-stop control efficiency.

[0005] Therefore, it is essential to provide a rapid start-stop device for preventing cavitation in vacuum pumps to address the shortcomings of existing technologies. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a rapid start-stop device for a vacuum pump to prevent cavitation. This invention uses a small motor to drive a spherical guide block to rotate, which in turn drives a circular slider to move circumferentially along an annular slide rail. A spring telescopic rod pushes a waterproof vibration motor to perform radial telescopic motion. A bubble-breaking needle punctures air bubbles in the flowing liquid in a three-dimensional composite motion trajectory, thus achieving an anti-cavitation mechanism during the start-up phase. A wave-shaped rotating plate rotates with the spherical guide block, guiding the water flow to form a stable laminar flow. A guide hopper concentrates the laminar liquid and directs it to a circular filter window. The circular filter window intercepts unbroken air bubbles and solid impurities, achieving turbulence suppression and guidance. A waterproof electric push rod pushes a circular blocking plate to move horizontally, tightly sealing the inlet of the connecting pipe to form a mechanical physical isolation barrier. Rapid start-up and shutdown are achieved through the isolation at the inlet of the connecting pipe. After the pipeline is cut off, an anti-backflow mechanism is provided during the shutdown phase.

[0007] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0008] A rapid start-stop device for preventing cavitation in a vacuum pump is provided, comprising a vacuum pump body, a connecting pipe that is inclinedly connected to the suction port of the vacuum pump body, and a rapid start-stop mechanism for preventing cavitation in the connecting pipe is installed inside the connecting pipe.

[0009] Specifically, the anti-cavitation rapid start-stop mechanism includes a circular filter screen, which is installed at one end of the connecting pipe near the suction port of the vacuum pump body. A blocking component is movably installed at the other end of the connecting pipe. Two support rods are symmetrically installed at the bottom of the blocking component, and the outer ends of the two support rods are fixedly installed on the inner wall of the connecting pipe.

[0010] Preferably, a waterproof cover is installed at the bottom of the blocking component, a small motor is installed inside the waterproof cover, a spherical guide block is installed axially below the small motor, an annular slide rail is provided on the outer circumference of the spherical guide block, a circular slider is slidably engaged on the annular slide rail, and a spring telescopic rod is installed on the outer side of the circular slider.

[0011] A waterproof vibration motor is installed at the end of the spring telescopic rod, and a bubble-breaking needle is installed on the waterproof vibration motor. A wave-shaped rotating plate is installed at the bottom of the spherical guide block, and an annular plate is rotatably installed at the end of the wave-shaped rotating plate. The outer side of the annular plate is installed on the inner wall of the connecting tube. A guide hopper is integrally formed below the annular plate and is located above the filter screen.

[0012] The blocking assembly includes a waterproof electric actuator, the fixed end of which is installed between two support rods. A waterproof cover is installed at the bottom of the fixed end of the waterproof electric actuator, and a circular blocking plate is installed at the telescopic end of the waterproof electric actuator. The circular blocking plate movably abuts against the water inlet of the connecting pipe.

[0013] An annular groove is provided on the inner side of the annular plate, and the annular groove is slidably installed with the end of the wave-shaped rotating plate.

[0014] This invention features a bubble-breaking unit and a flow-guiding unit that activate synchronously during startup, eliminating cavitation sources before liquid enters the pump chamber. During shutdown, the cut-off unit prioritizes operation to isolate the pipeline, the flow-guiding unit guides orderly flow, and the full-cycle filter screen continuously provides impurity isolation and protection. The three-dimensional moving bubble-breaking needle actively breaks bubbles, preventing cavitation from the source. The wave-guided structure suppresses turbulence and reduces bubble regeneration. The waterproof electric push rod mechanically cuts off the impurities for rapid pipeline isolation. There is no pre-vacuuming process, startup requires no delay, the spring telescopic rod controls the displacement of the bubble-breaking needle, and the inclined connecting tube utilizes gravity to enhance impurity sedimentation and separation. Attached Figure Description

[0015] The present invention will be further described with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the present invention.

[0016] Figure 1This is a three-dimensional view of the overall structure of a rapid start-stop device for a vacuum pump that prevents cavitation.

[0017] Figure 2 This is a partial three-dimensional view of a cavitation-resistant rapid start-stop device for a vacuum pump according to this utility model.

[0018] Figure 3 This is a partial three-dimensional view of a cavitation-resistant rapid start-stop device for a vacuum pump according to this utility model.

[0019] from Figures 1 to 3 Including:

[0020] 1. Vacuum suction pump body;

[0021] 2. Connecting pipe;

[0022] 3. Anti-cavitation rapid start / stop mechanism;

[0023] 4. Circular filter window;

[0024] 5. Blocking components;

[0025] 6. Support rod;

[0026] 7. Waterproof cover;

[0027] 8. Small motors;

[0028] 9. Spherical guide block;

[0029] 10. Circular slide rail;

[0030] 11. Circular slider;

[0031] 12. Spring telescopic rod;

[0032] 13. Waterproof vibration motor;

[0033] 14. Bubble-breaking needle;

[0034] 15. Wave-shaped rotating plate;

[0035] 16. Circular plate;

[0036] 17. Guide hopper;

[0037] 18. Waterproof electric actuator;

[0038] 19. Circular cut-off plate;

[0039] 20. Annular groove. Detailed Implementation

[0040] The present invention will be further described in conjunction with the following embodiments.

[0041] Example 1.

[0042] like Figure 1-3 As shown, a cavitation-resistant rapid start-stop device for a vacuum pump includes a vacuum pump body 1, a connecting pipe 2 inclinedly connected to the suction port of the vacuum pump body 1, and an cavitation-resistant rapid start-stop mechanism 3 installed inside the connecting pipe 2.

[0043] like Figure 1-3 As shown, the anti-cavitation rapid start-stop mechanism 3 includes a circular filter window 4. The circular filter window 4 is installed at one end of the connecting pipe 2 near the suction port of the vacuum pump body 1. A blocking component 5 is movably installed at the other end of the connecting pipe 2. Two support rods 6 are symmetrically installed at the bottom of the blocking component 5. The outer ends of the two support rods 6 are fixedly installed on the inner wall of the connecting pipe 2.

[0044] like Figure 1-3 As shown, a waterproof cover 7 is installed at the bottom of the blocking component 5. A small motor 8 is installed inside the waterproof cover 7. A spherical guide block 9 is installed axially below the small motor 8. An annular slide rail 10 is provided on the outer circumference of the spherical guide block 9. A circular slider 11 is slidably engaged on the annular slide rail 10. A spring telescopic rod 12 is installed on the outer side of the circular slider 11.

[0045] like Figure 1-3 As shown, a waterproof vibration motor 13 is installed at the end of the spring telescopic rod 12, and a bubble-breaking needle 14 is installed on the waterproof vibration motor 13. A wave-shaped rotating plate 15 is installed at the bottom of the spherical guide block 9, and an annular plate 16 is rotatably installed at the end of the wave-shaped rotating plate 15. The outer side of the annular plate 16 is installed on the inner wall of the connecting tube 2. A guide hopper 17 is integrally formed below the annular plate 16 and is positioned above the filter screen.

[0046] like Figure 1-3 As shown, the blocking assembly 5 includes a waterproof electric push rod 18. The fixed end of the waterproof electric push rod 18 is installed between two support rods 6. A waterproof cover 7 is installed at the bottom of the fixed end of the waterproof electric push rod 18. A circular blocking plate 19 is installed at the telescopic end of the waterproof electric push rod 18. The circular blocking plate 19 movably abuts against the water inlet of the connecting pipe 2.

[0047] like Figure 1-3 As shown, an annular groove 20 is provided on the inner side of the annular plate 16, and the annular groove 20 is slidably installed with the end of the wave-shaped rotating plate 15.

[0048] This utility model includes a connecting pipe 2 that is inclinedly installed at the suction port of the vacuum pump body 1. An anti-cavitation rapid start-stop mechanism 3 is installed inside the connecting pipe 2. The two ends of the connecting pipe 2 are the water inlet and the connection port of the vacuum pump body 1, respectively. The anti-cavitation rapid start-stop mechanism 3 consists of a bubble breaking unit, a pipeline cutting unit, and a flow guiding unit.

[0049] The bubble breaking unit includes a waterproof cover 7 fixedly installed on the inner wall of the connecting tube 2, which encapsulates a small motor 8. The output shaft of the small motor 8 passes downward through the bottom of the waterproof cover 7. A spherical guide block 9 is fixedly connected to the end of the output shaft of the small motor 8. An annular closed slide rail is opened on the outer surface of the spherical guide block 9. A circular slider 11 is nested in the annular slide rail 10 and slides along the circumference of the slide rail. One end of the spring telescopic rod 12 is fixedly connected to the circular slider 11, and the other end is connected to the waterproof vibration motor 13. A slender bubble breaking needle 14 is installed on the output shaft of the waterproof vibration motor 13. The whole unit is installed in the inner cavity of the connecting tube 2.

[0050] The pipeline cutting-off unit includes two support rods 6 fixed to the upper part of the inner wall of the pipe, a waterproof electric push rod 18 vertically installed between the two support rods 6, and a circular blocking plate 19 fixedly connected to the telescopic end of the waterproof electric push rod 18. The outer diameter of the circular blocking plate 19 matches the inner diameter of the water inlet of the connecting pipe 2.

[0051] The flow guiding unit includes a wave-shaped rotating plate 15 installed between the bottom surface of the spherical guide block 9 and the inner side of the annular plate 16. The annular plate 16 is fixedly installed on the inner wall of the connecting tube 2. An annular groove 20 is opened on the inner side of the annular plate 16. The end of the wave-shaped rotating plate 15 is embedded in the groove. A conical guide hopper 17 is integrally formed on the bottom surface of the annular plate 16. A circular filter screen 4 is fixedly installed on the connecting tube 2 near the suction port of the vacuum pump body 1. The bottom outlet of the guide hopper 17 is directly opposite the center of the circular filter screen 4.

[0052] This invention uses a small motor 8 to drive a spherical guide block 9 to rotate, which in turn drives a circular slider 11 to move circumferentially along an annular slide rail 10. A spring telescopic rod 12 pushes a waterproof vibration motor 13 to perform radial telescopic motion. A bubble-breaking needle 14 punctures bubbles in the flowing liquid in a three-dimensional composite motion trajectory, thus achieving an anti-cavitation mechanism during the start-up phase. A wave-shaped rotating plate 15 rotates with the spherical guide block 9 to guide the water flow to form a stable laminar flow. A guide hopper 17 concentrates the laminar liquid and guides it to a circular filter window 4. The circular filter window 4 intercepts unbroken bubbles and solid impurities, thus achieving turbulence suppression and guidance. A waterproof electric push rod 18 pushes a circular blocking plate 19 to move horizontally. The circular blocking plate 19 tightly seals the inlet of the connecting pipe 2, forming a mechanical physical isolation barrier. Rapid start-up and shutdown are achieved through the isolation of the inlet of the connecting pipe 2. After the pipeline is cut off, an anti-backflow mechanism is provided during the shutdown phase.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A rapid start-stop device for preventing cavitation in a vacuum pump, comprising a vacuum pump body, characterized in that: The vacuum pump body has a connecting pipe at the suction port, and the connecting pipe is equipped with an anti-cavitation quick start-stop mechanism. The anti-cavitation rapid start-stop mechanism includes a circular filter window, which is installed at one end of the connecting tube near the suction port of the vacuum pump body. A blocking assembly is movably installed at the other end of the connecting tube. Two support rods are symmetrically installed at the bottom of the blocking assembly, and the outer ends of the two support rods are fixedly installed on the inner wall of the connecting tube. A waterproof cover is installed at the bottom of the blocking assembly, and a small motor is installed inside the waterproof cover. A spherical guide block is axially driven below the small motor. An annular slide rail is provided on the outer circumference of the spherical guide block. A circular slider is slidably engaged on the annular slide rail. A spring telescopic rod is installed on the outer side of the circular slider. A waterproof vibration motor is installed at the end of the spring telescopic rod. A bubble-breaking needle is installed on the waterproof vibration motor. A wave-shaped rotating plate is installed at the bottom of the spherical guide block. An annular plate is rotatably installed at the end of the wave-shaped rotating plate. The outer side of the annular plate is installed on the inner wall of the connecting tube. A guide hopper is integrally formed below the annular plate and is positioned above the filter window.

2. The anti-cavitation rapid start-stop device for a vacuum suction pump according to claim 1, characterized in that: The blocking assembly includes a waterproof electric push rod, the fixed end of which is installed between the two support rods, the waterproof cover is installed at the bottom of the fixed end of the waterproof electric push rod, and a circular blocking plate is installed at the telescopic end of the waterproof electric push rod, the circular blocking plate being movably abutting against the water inlet of the connecting pipe.

3. The anti-cavitation rapid start-stop device for a vacuum suction pump according to claim 2, characterized in that: An annular groove is provided on the inner side of the annular plate, and the annular groove is slidably installed with the end of the wave-shaped rotating plate.

4. The anti-cavitation rapid start-stop device for a vacuum suction pump according to claim 2, characterized in that: The connecting pipe is installed at an angle at the suction port of the vacuum pump body.

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