A vacuum pump air tightness detection device and detection method thereof

Abstract

The present invention discloses a vacuum pump air tightness detection device and a detection method thereof, which relates to the technical field of vacuum pumps, and includes a detection box, a vacuum pump, a scraper assembly, a drive assembly and a control system, wherein the scraper assembly includes a fixed cotton block, a movable cotton block, two groups of camera modules, a drive plate and two telescopic rods, wherein the fixed cotton block is fixed in the middle of the detection box, the movable cotton block is fixed on the side of the drive plate facing the fixed cotton block, the two groups of camera modules are fixed on the inner wall of the detection box and are respectively located on the left and right sides above the fixed cotton block, the two telescopic rods are fixed on one side of the detection box and the driving end is connected to the driving plate, the vacuum pump is fixed on the drive assembly, and the control system is connected to the scraper assembly and the drive assembly signal, and is used to control the detection process and perform result analysis. The present invention further improves the accuracy of air tightness detection.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pumps, and in particular to a vacuum pump air tightness detection device and a detection method thereof. Background Art

[0002] A vacuum pump is a device used to reduce the number of gas molecules in a container or enclosed space to create a low pressure or partial vacuum state. The airtightness test of a vacuum pump is a very important process to ensure that the vacuum pump can maintain the required vacuum state during use and avoid loss of suction or failure due to insufficient airtightness.

[0003] Existing vacuum pump air tightness testing usually involves the use of a special air tightness testing instrument, which is connected to the vacuum pump and tested under negative pressure. During the test, the gas is sucked out from the inside of the pump through the suction port, and the air tightness is determined by a water tank or other methods to see if it meets the requirements.

[0004] The vacuum pumps have different appearances and are affected by the irregular external shell. When immersed in water, bubbles will be stuck in the lower part of the shell or attached to the surface of the shell, thus affecting the airtightness results when measuring the water level. Summary of the invention

[0005] The object of the present invention is to provide a vacuum pump airtightness detection device and a detection method thereof to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a vacuum pump air tightness detection device and a detection method thereof, comprising a detection box, a vacuum pump, a scraper brush assembly, a drive assembly and a control system, the scraper brush assembly comprising a fixed cotton block, a movable cotton block, two groups of camera modules, a drive plate and two telescopic rods, wherein the fixed cotton block is fixed in the middle of the detection box, the movable cotton block is fixed on the side of the drive plate facing the fixed cotton block, the two groups of camera modules are fixed on the inner wall of the detection box and are respectively located on the left and right sides above the fixed cotton block, the two telescopic rods are fixed on one side of the detection box and the driving end is connected to the driving plate, the vacuum pump is fixed on the drive assembly, and the control system is connected to the scraper brush assembly and the drive assembly signal for controlling the detection process and performing result analysis.

[0007] Furthermore, the two groups of camera modules are connected to the control system signal and are suitable for transmitting images to the control system. The opposite surfaces of the fixed cotton block and the movable cotton block can be spliced ​​and a gap matching the appearance of the vacuum pump is opened inside. The fixed cotton block and the movable cotton block are made of materials with good water absorption performance.

[0008] Furthermore, the driving assembly includes a fixed seat, a movable seat, a slide rail, two screw rods, a driven gear, a driving gear and a driving motor, wherein the fixed seat is fixed on the movable seat, the movable seat is slidably matched with the slide rail, the two screw rods are passed through the movable seat and both ends are rotatably set on the detection box, the driven gears are respectively sleeved on one end of the corresponding screw rods, the driving gear is rotatably set on the side wall of the detection box and matched with the driven gear teeth, and the driving motor is fixed on one side of the detection box and the driving end is connected to the driving gear.

[0009] Furthermore, a temperature sensing module is provided on the fixing seat for detecting the temperature of the liquid, and a water level detection module is further provided on the inner wall of the detection box.

[0010] Furthermore, one air port of the vacuum pump is closed, and the other air port is connected to a hose, and the hose passes through a detection box and is connected to an air pumping device, a force sensor is provided on the detection box relative to the hose, and the air pumping device is provided with a movable base.

[0011] Furthermore, the air pumping device is provided with an air pumping unit and an air supply unit, wherein the air pumping unit is suitable for extracting the gas inside the vacuum pump to make the inside of the vacuum pump into a vacuum state, and the air supply unit is suitable for supplying gas into the vacuum pump; the movable base structure adopts but is not limited to a screw rod moving module and is connected to the force sensor signal, and is suitable for driving the air pumping device to approach or move away from the detection box according to the force signal fed back by the force sensor.

[0012] Furthermore, the detection box is externally connected to a water circulation system, and the water circulation system is provided with a water driving unit and a temperature changing unit, wherein the water driving unit is used to transport or extract water into the detection box, and the temperature changing unit is used to change the temperature of the water.

[0013] Further, the detection method is as follows:

[0014] Step 1: Fix the vacuum pump on the driving assembly, control the vacuum pump to move to the fixed cotton block, and drive the moving cotton block to fit the fixed cotton block so that the surface of the vacuum pump is basically covered;

[0015] Step 2: The water circulation system transports water into the detection box until the water surface covers the camera module;

[0016] Step 3: Drive the mobile cotton block away from the fixed cotton block, and at the same time drive the vacuum pump back and forth through the fixed cotton block to eliminate bubbles that may exist on the surface. During this process, the camera module captures the bubbles in the water and feeds them back to the control system for judgment;

[0017] Step 4: When the bubbles on the surface of the vacuum pump are eliminated, the gas pumping device inputs a certain amount of gas into the vacuum pump. The camera module captures the bubbles in the water during this process and feeds them back to the control system for judgment;

[0018] Step 5: After the air supply test is completed, the air supply device extracts the gas inside the vacuum pump to make it a vacuum state, and the water level detection module detects the change of the water level in the detection box and feeds it back to the control system for judgment;

[0019] Step 6: The control system uses the information obtained to obtain the airtightness result.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: by providing a scraping brush assembly, the generation of bubbles on the surface of the vacuum pump can be reduced as much as possible during the input of water, and by scraping back and forth, the bubbles produced on the surface of the vacuum pump can be further removed, thereby improving the accuracy of detection; by providing a water circulation system, in conjunction with a camera module, the adhesion efficiency of bubbles can be reduced by changing the water temperature, thereby removing bubbles that are difficult to eliminate with the scraping brush assembly, thereby further improving the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a partial schematic diagram of the present invention;

[0024] Figure 3 is a schematic diagram of a connecting rod assembly of the present invention;

[0025] In the figure: 1. Detection box; 2. Vacuum pump; 3. Scraping brush assembly; 31. Fixed cotton block; 32. Moving cotton block; 33. Camera module; 34. Driving plate; 35. Telescopic rod; 4. Driving assembly; 41. Fixed seat; 42. Moving seat; 43. Slide rail; 44. Screw; 45. Driven gear; 46. Driving gear; 47. Driving motor; 5. Temperature sensing module; 6. Hose; 7. Force sensor. DETAILED DESCRIPTION

[0026] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-3The present invention provides a technical solution: a vacuum pump air tightness detection device and a detection method thereof, comprising a detection box 1, a vacuum pump 2, a scraper assembly 3, a drive assembly 4 and a control system, wherein the scraper assembly 3 comprises a fixed cotton block 31, a movable cotton block 32, two sets of camera modules 33, a drive plate 34 and two telescopic rods 35, wherein the fixed cotton block 31 is fixed in the middle of the detection box 1, the movable cotton block 32 is fixed on the side of the drive plate 34 facing the fixed cotton block 31, the two sets of camera modules 33 are fixed on the inner wall of the detection box 1 and are respectively located on the left and right sides above the fixed cotton block 31, the two telescopic rods 35 are fixed on one side of the detection box 1 and the driving end is connected to the drive plate 34, the vacuum pump 2 is fixed on the drive assembly 4, and the control system is connected to the scraper assembly 3 and the drive assembly 4 signals for controlling the detection process and performing result analysis.

[0028] It should be noted that: the two sets of camera modules 33 are connected to the control system signal and are suitable for transmitting images to the control system. The opposite surfaces of the fixed cotton block 31 and the movable cotton block 32 can be spliced ​​and a gap matching the appearance of the vacuum pump 2 is opened inside. The fixed cotton block 31 and the movable cotton block 32 are made of materials with good water absorption properties.

[0029] In actual operation, the two telescopic rods 35 push the driving plate 34 to move, thereby driving the movable cotton block 32 to approach or move away from the fixed cotton block 31 .

[0030] The driving assembly 4 includes a fixed seat 41, a movable seat 42, a slide rail 43, two screws 44, a driven gear 45, a driving gear 46 and a driving motor 47, wherein the fixed seat 41 is fixed on the movable seat 42, the movable seat 42 and the slide rail 43 are slidably matched, the two screws 44 are passed through the movable seat 42 and both ends are rotatably set on the detection box 1, the driven gears 45 are respectively sleeved on one end of the corresponding screws 44, the driving gear 46 is rotatably set on the side wall of the detection box 1 and is matched with the teeth of the driven gear 45, and the driving motor 47 is fixed on one side of the detection box 1 and the driving end is connected to the driving gear 46.

[0031] It should be supplemented that: a temperature sensing module 5 is provided on the fixing seat 41 for detecting the temperature of the liquid, and a water level detection module is also provided on the inner wall of the detection box 1 .

[0032] In actual operation, the driving motor 47 drives the two driven gears 45 to rotate through the driving gear 46, thereby driving the two screws 44 to rotate synchronously to realize the movement of the moving seat 42 on the slide rail 43. The thread settings of the two screws 44 should match the rotation direction of the corresponding driven gears 45 to meet the synchronization requirements.

[0033] One air port of the vacuum pump 2 is closed, and the other air port is connected to a hose 6. The hose 6 passes through the detection box 1 and is connected to an air pumping device. A force sensor 7 is arranged at a position of the detection box 1 relative to the hose 6, and the air pumping device is provided with a movable base.

[0034] It should be additionally explained that the force sensor 7 is used to monitor the pulling state of the hose 6. When the pulling force generated by the vacuum pump 2 moving and pulling the hose 6 is detected, the air pumping device moves accordingly to avoid the hose 6 from being broken.

[0035] The air pumping device is provided with an air pumping unit and an air supply unit, wherein the air pumping unit is suitable for extracting the gas inside the vacuum pump 2 to make the inside into a vacuum state, and the air supply unit is suitable for delivering gas into the vacuum pump 2. The movable base structure adopts but is not limited to a screw rod movable module and is connected to the force sensor 7 signal, and is suitable for driving the air pumping device to approach or move away from the detection box 1 according to the force signal fed back by the force sensor 7.

[0036] The detection box 1 is externally connected to a water circulation system, which is provided with a water driving unit and a temperature changing unit, wherein the water driving unit is used to transport or extract water into the detection box 1, and the temperature changing unit is used to change the temperature of the water.

[0037] The specific implementation methods are as follows:

[0038] Step 1: Fix the vacuum pump 2 on the driving assembly 4, control the vacuum pump 2 to move to the fixed cotton block 31, and drive the moving cotton block 32 to fit the fixed cotton block 31, so that the surface of the vacuum pump 2 is basically covered;

[0039] Step 2: The water circulation system transports water into the detection box 1 until the water surface covers the camera module 33;

[0040] Step 3: Drive the mobile cotton block 32 away from the fixed cotton block 31, and drive the vacuum pump 2 to pass through the fixed cotton block 31 to eliminate bubbles that may exist on the surface. During this process, the camera module 33 captures the bubbles in the water and feeds them back to the control system for judgment;

[0041] Step 4: After the bubbles on the surface of the vacuum pump 2 are eliminated, the gas pumping device inputs a fixed amount of gas into the vacuum pump 2. The camera module 33 captures the bubbles in the water during this process and feeds them back to the control system for judgment;

[0042] Step 5: After the air supply test is completed, the air supply device extracts the gas inside the vacuum pump 2 to make it a vacuum state, and the water level detection module detects the change of the water level in the detection box 1 and feeds it back to the control system for judgment;

[0043] Step 6: The control system uses the information obtained to obtain the airtightness result.

[0044] Specifically, in step 2, the temperature of the water transported by the water circulation system can be adjusted according to the result of bubble elimination on the surface of the vacuum pump 2. As the ambient temperature increases, the adhesion efficiency of the bubbles gradually decreases. Therefore, the adhesion of bubbles can be reduced by increasing the water temperature. If the camera module 33 can still capture obvious bubble adhesion after the fixed cotton block 31 is scraped off, the variable temperature unit will heat the stored water, and the water drive unit will transport variable temperature water from the lower side of the detection box 1 and replace the water by extracting the original temperature water from the upper side of the detection box 1. In this process, the water level should always be kept above the camera module 33. The temperature sensing module 5 is used to monitor the water temperature. When the specified temperature is reached, the water drive unit stops transporting.

[0045] In steps 3 and 4, the camera module 33 uses high-speed camera technology to capture bubbles in the water, collects images of underwater bubble groups through a high-speed camera, and then uses digital image processing technology to analyze the images to extract characteristic information of the bubble groups;

[0046] Specifically, the methods generally used for underwater bubble feature detection include edge detection, threshold segmentation, model-based detection, and watershed segmentation. Among them, edge detection and threshold segmentation have good detection effects on bubble images taken under backlight conditions with high contrast between bubbles and background, but cannot accurately detect bubble group features for side-light and top-light images with low contrast between bubbles and background and more noise; threshold segmentation has a good segmentation effect for bubble group images with independent bubbles, but has a poor segmentation effect for bubble group images with a large number of bubbles sticking and overlapping; model-based detection mainly includes Hough transform and Snake active contour, but large bubbles of millimeter level will produce irregular shapes due to deformation in water; therefore, the camera module 33 preferably uses the watershed segmentation method to detect underwater bubble groups.

[0047] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0048] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vacuum pump air tightness detection device, characterized in that: include: A detection box (1), a vacuum pump (2), a scraping brush assembly (3), a driving assembly (4), and a control system, wherein the scraping brush assembly (3) comprises a fixed cotton block (31), a movable cotton block (32), two sets of camera modules (33), a driving plate (34), and two telescopic rods (35), wherein the fixed cotton block (31) is fixed in the middle of the detection box (1), the movable cotton block (32) is fixed on a side of the driving plate (34) facing the fixed cotton block (31), the two sets of camera modules (33) are fixed on the inner wall of the detection box (1) and are respectively located on the left and right sides above the fixed cotton block (31), the two telescopic rods (35) are fixed on one side of the detection box (1) and the driving ends are connected to the driving plate (34), the vacuum pump (2) is fixed on the driving assembly (4), and the driving assembly (4) comprises a fixed seat (41), a movable cotton block (32), two sets of camera modules (33), a driving plate (34), and two telescopic rods (35). A movable seat (42), a slide rail (43), two screw rods (44), a driven gear (45), a driving gear (46) and a driving motor (47), wherein the fixed seat (41) is fixed on the movable seat (42), the movable seat (42) and the slide rail (43) are slidably matched, the two screw rods (44) are inserted into the movable seat (42) and both ends are rotatably arranged on the detection box (1), the driven gear (45) is respectively sleeved on one end of the corresponding screw rod (44), the driving gear (46) is rotatably arranged on the side wall of the detection box (1) and is matched with the teeth of the driven gear (45), the driving motor (47) is fixed on one side of the detection box (1) and the driving end is connected to the driving gear (46), and the control system is connected to the scraping brush assembly (3) and the driving assembly (4) by signal, and is suitable for controlling the detection process and performing result analysis.

2. A vacuum pump air tightness detection device according to claim 1, characterized in that: The two sets of camera modules (33) are connected to the control system signal and are suitable for transmitting images to the control system. The opposite surfaces of the fixed cotton block (31) and the movable cotton block (32) can be spliced ​​and have a notch inside that matches the appearance of the vacuum pump (2). The fixed cotton block (31) and the movable cotton block (32) are made of materials with good water absorption performance.

3. A vacuum pump air tightness detection device according to claim 2, characterized in that: A temperature sensing module (5) is provided on the fixing seat (41), and a water level detection module is further provided on the inner wall of the detection box (1).

4. A vacuum pump air tightness detection device according to claim 3, characterized in that: One air port of the vacuum pump (2) is closed, and the other air port is connected to a hose (6); the hose (6) passes through the detection box (1) and is connected to an air pumping device; a force sensor (7) is provided at a position of the detection box (1) relative to the hose (6); and the air pumping device is provided with a movable base.

5. A vacuum pump air tightness detection device according to claim 4, characterized in that: The gas pumping and supplying device is provided with a gas pumping unit and a gas supplying unit, wherein the gas pumping unit is suitable for extracting gas from the inside of the vacuum pump (2) to make the inside of the vacuum pump (2) a vacuum state, and the gas supplying unit is suitable for supplying gas into the vacuum pump (2); The movable base structure adopts a screw movable module and is connected to the force sensor (7) signal, and is suitable for driving the air pumping device to move closer to or away from the detection box (1) according to the force signal fed back by the force sensor (7).

6. A vacuum pump air tightness detection device according to claim 5, characterized in that: The detection box (1) is externally connected to a water circulation system, wherein the water circulation system is provided with a water drive unit and a temperature change unit, wherein the water drive unit is used to transport or extract water into the detection box (1), and the temperature change unit is used to change the temperature of the water body.

7. A vacuum pump air tightness detection device according to claim 6, characterized in that: The detection method is as follows: Step 1: fix the vacuum pump (2) on the driving assembly (4), control the vacuum pump (2) to move to the fixed cotton block (31), and at the same time drive the moving cotton block (32) to fit the fixed cotton block (31) so that the surface of the vacuum pump (2) is covered; Step 2: The water circulation system transports water into the detection box (1) until the water surface covers the camera module (33); Step 3: driving the mobile cotton block (32) away from the fixed cotton block (31), and driving the vacuum pump (2) to pass through the fixed cotton block (31) to eliminate bubbles that may exist on the surface. During this process, the camera module (33) captures the bubbles in the water and feeds them back to the control system for judgment; Step 4: When the bubbles on the surface of the vacuum pump (2) are completely eliminated, the gas pumping device inputs a fixed amount of gas into the vacuum pump (2), and the camera module (33) captures the bubbles in the water during this process and feeds back to the control system for judgment; Step 5: After the air supply test is completed, the air supply device extracts the gas inside the vacuum pump (2) to make it a vacuum state, and the water level detection module detects the change of the water level in the detection box (1) and feeds it back to the control system for judgment; Step 6: The control system uses the information obtained to obtain airtightness results.

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