A water pump volute air tightness detection device

Abstract

The utility model discloses a kind of water pump volute air-tightness detection devices, belong to the technical field of volute production, including workbench, the upper end surface of workbench is provided with mounting groove, lower sealing device is arranged in mounting groove, the upper of workbench is fixedly provided with hydraulic telescopic link through several support columns, the output end of hydraulic telescopic link is provided with upper sealing device, the upper end surface of workbench is fixedly provided with telescopic cylinder.The utility model uses, lower sealing device is placed in mounting groove and pressed downward, lower sealing device is compressed to ejector mechanism simultaneously locking mechanism locks ejector mechanism, so that lower sealing device is installed and set in mounting groove;When needing to replace lower sealing device, press trigger mechanism, so that locking mechanism removes the locking of ejector mechanism, ejector mechanism upward ejects lower sealing device, so that lower sealing device is pushed out from mounting groove to set height, to conveniently take out lower sealing device, realize the purpose of replacing lower sealing device conveniently.

Description

Technical Field

[0001] This utility model relates to an airtightness testing device, and more particularly to an airtightness testing device for a water pump volute. Background Technology

[0002] With the continuous advancement of water pump casting technology and the increasing demands for water pump sealing, pre-assembly airtightness testing of the pump casing is crucial to ensure normal operation and prevent malfunctions caused by leaks. Water pump airtightness testing typically uses air as the detection medium. Specifically, this process involves filling the pump under test with compressed air and ensuring it reaches a certain pressure level. After maintaining this pressure for a period of time, a sophisticated pressure sensor monitors and records any minute pressure changes. This data is then acquired by a built-in comparison system and compared to a pre-set allowable leakage range. Through this automated process, the system can accurately determine whether the water pump's airtightness meets established standards.

[0003] Existing volute casings typically include a motor side 6, a water inlet 7, and a drain outlet 8. For airtightness testing, these components need to be sealed. Existing airtightness testing devices typically consist of an upper mold, a lower mold, and a test head. The lower mold seals the motor side 6, the upper mold seals the water inlet 7, and the test head seals the drain outlet 8. Simultaneously, compressed air is injected into the drain outlet 8 for testing. To enable testing of various volute casing sizes, airtightness testing devices often employ a design that facilitates disassembly of the upper mold, lower mold, and test head. However, the lower mold is horizontally placed within the testing device's worktable. While it can be removed, the lack of gripping points makes removal difficult, complicating mold replacement and reducing testing efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a water pump casing airtightness testing device, which has the advantage of convenient replacement of the lower mold, effectively solving the problem of inconvenient replacement of the lower mold and reduced testing efficiency in the prior art.

[0005] This utility model adopts the following technical solution: a water pump casing airtightness testing device, including a workbench, an installation groove on the upper surface of the workbench, a lower sealing device installed in the installation groove, a hydraulic telescopic rod fixedly installed above the workbench by several support columns, an upper sealing device installed at the output end of the hydraulic telescopic rod, a telescopic cylinder fixedly installed on the upper surface of the workbench, and a side sealing device installed at the output end of the telescopic cylinder; the upper sealing device is used to block the water inlet of the casing, the side sealing device is used to seal the drain outlet of the casing, and the lower sealing device is used to block the motor side of the casing; an air inlet pipe is installed on the side sealing device; the workbench is also provided with a pop-out mechanism, a locking mechanism, and a triggering mechanism, the lower sealing device compresses the pop-out mechanism while the locking mechanism locks the pop-out mechanism, so that the lower sealing device is installed in the installation groove; pressing the triggering mechanism causes the locking mechanism to release the locking of the pop-out mechanism, and the pop-out mechanism pops the lower sealing device upward.

[0006] Furthermore, a base is fixedly provided on the lower end face of the workbench, and a receiving groove is provided on the upper end face of the base corresponding to the mounting groove. The pop-out mechanism includes several guide rods that pass through the mounting groove of the workbench in the vertical direction, and a plate fixedly provided in the receiving groove with the bottom end of each guide rod. Several first springs are fixedly provided on the lower end face of the plate, and the bottom end of each first spring is fixedly provided with the inner bottom wall of the receiving groove of the base. A locking pin is fixedly provided on the side of the plate.

[0007] Furthermore, the locking mechanism includes a locking plate that is slidably disposed on the bottom wall of the receiving groove in the left-right direction. The locking plate has a locking groove, which includes a straight groove and a square groove at the bottom of the straight groove. A first driving inclined surface is formed on the left side wall of the straight groove. An elongated hole is formed on the locking plate in the left-right direction. A first fixing pin is fixedly disposed on the inner side wall of the receiving groove of the base. The first fixing pin is located in the elongated hole. A second fixing pin is fixedly disposed on the inner side of the locking plate. A second spring is fixedly disposed between the first fixing pin and the second fixing pin. The second spring is in a stretched state. The second spring pulls the locking plate to the right through the second fixing pin, so that the first fixing pin is located at the left end of the elongated hole. A driving groove is formed on the locking plate located on the right side of the locking groove.

[0008] Furthermore, the triggering mechanism includes a button that is slidably disposed in the base in the up-down direction, the bottom end of the button extending into the receiving groove, a drive rod that is fixedly disposed radially at the bottom end of the button, a second drive slope being provided on the left side wall of the drive groove, and the drive rod being located in the drive groove; when the lower sealing device is installed in the mounting groove, the drive rod is located in the drive groove and in contact with the second drive slope.

[0009] Furthermore, a third spring is fixedly provided on the lower end face of the button.

[0010] Furthermore, a limit rod is fixedly provided at the bottom of the button, the limit rod extends downward into a slide groove opened in the base, and a circular plate is fixedly provided at the bottom of the limit rod, the circular plate slidingly disposed in the slide groove.

[0011] Furthermore, the lower sealing device includes a sealing plate, with an annular groove on the upper end surface of the sealing plate, and a sealing ring embedded in the annular groove.

[0012] Furthermore, the upper sealing device includes a pressure plate and a disc. The pressure plate is fixedly installed at the output end of the hydraulic telescopic rod. Several bolts are fixedly installed on the upper surface of the disc, and all bolts are fitted with the pressure plate. Nuts are threaded onto the bolts located above the pressure plate. A set distance is spaced between the disc and the pressure plate. Several fourth springs are fixedly installed between the disc and the pressure plate. The fourth springs are in a compressed state. A pressure head is fixedly installed on the lower surface of the disc. A sealing tube is fitted on the pressure head. The sealing tube is tightly fitted with the pressure head and is used to seal the water inlet of the volute.

[0013] Furthermore, the side sealing device includes an air storage box fixedly installed at the output end of the telescopic cylinder, a sleeve fixedly installed on the right side of the air storage box communicating with the inside of the air storage box, and a connecting pipe sleeved inside the sleeve; the connecting pipe seals the water inlet of the volute.

[0014] Furthermore, a display screen, a start button, and an emergency stop button are installed on the front side of the base.

[0015] I. This utility model comprises a lower sealing device, an ejector mechanism, a locking mechanism, and a triggering mechanism. When in use, the lower sealing device is placed in the mounting groove and pressed downwards. The lower sealing device compresses the ejector mechanism, while the locking mechanism locks the ejector mechanism, thus installing the lower sealing device within the mounting groove. When the lower sealing device needs to be replaced, the triggering mechanism is pressed, causing the locking mechanism to release its lock on the ejector mechanism. The ejector mechanism then ejects the lower sealing device upwards, pushing it out of the mounting groove to a set height, thereby facilitating its removal and replacement.

[0016] II. This utility model, by setting a guide rod, a plate, a first spring, a locking plate, a first fixing pin, a second fixing pin, and a second spring, achieves the following in use: When the lower sealing device presses down on the guide rod, the guide rod drives the plate downwards. The plate compresses each of the first springs. As the plate moves downwards, it drives the locking pin downwards, causing the locking pin to act on the first driving inclined surface, causing the locking plate to move to the left. As the plate moves downwards, the locking pin enters the straight groove. The plate continues to move downwards, causing the locking pin to enter the square groove. At this point, the second spring pulls the second fixing pin to the right, which in turn drives the locking plate to the right, causing the locking pin to enter the left side of the square groove. The locking plate then locks the locking pin. The first spring pushes the plate upwards, causing the locking pin to move upwards, whereupon the locking pin is abutted against the inner top wall of the square groove, preventing it from moving upwards and thus preventing the plate from moving upwards. This achieves the purpose of locking the position of the locking pin. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the telescopic cylinder of this utility model.

[0019] Figure 3 This is an enlarged schematic diagram of the structure at point A in this utility model;

[0020] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the sealing tube in this utility model;

[0021] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the gas storage tank in this utility model;

[0022] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the base in this utility model;

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of the flat plate in this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the button in this utility model;

[0025] Figure 9 This is a three-dimensional structural diagram of the locking plate in this utility model;

[0026] Figure 10 This is a three-dimensional structural diagram of the volute in this utility model;

[0027] Figure 11 This is a three-dimensional structural diagram of the drain outlet of the volute in this utility model.

[0028] In the diagram: 1. Workbench; 2. Mounting slot; 3. Support column; 4. Hydraulic telescopic rod; 5. Telescopic cylinder; 6. Motor side; 7. Water inlet; 8. Drain outlet; 9. Air inlet pipe; 10. Base; 11. Receiving slot; 12. Guide rod; 13. Flat plate; 14. First spring; 15. Locking pin; 16. Locking plate; 17. Straight groove; 18. Square groove; 19. First driving inclined surface; 20. Elongated hole; 21. First fixing pin; 22. Second fixing pin; 23. Second spring. 24. Drive groove; 25. Button; 26. Drive rod; 27. Second drive ramp; 28. Third spring; 29. ​​Slide groove; 30. Circular plate; 31. Sealing plate; 32. Annular groove; 33. Sealing ring; 34. Pressure plate; 35. Disc; 36. Bolt; 37. Nut; 38. Fourth spring; 39. Pressure head; 40. Sealing pipe; 41. Gas storage tank; 42. Sleeve; 43. Connecting pipe; 44. Display screen; 45. Start button; 46. Emergency stop button. Detailed Implementation

[0029] Please see Figure 1-11 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0030] The existing volute includes a motor side 6, a water inlet 7, and a drain outlet 8.

[0031] The water pump volute airtightness testing device of this utility model includes a workbench 1, with an installation groove 2 on the upper surface of the workbench 1. A lower sealing device is installed in the installation groove 2. A hydraulic telescopic rod 4 is fixedly installed above the workbench 1 by several support columns 3. An upper sealing device is installed at the output end of the hydraulic telescopic rod 4. A telescopic cylinder 5 is fixedly installed on the upper surface of the workbench 1. A side sealing device is installed at the output end of the telescopic cylinder 5. In use, the volute is placed on the lower sealing device, the upper sealing device presses down to seal the water inlet 7 of the volute, and at the same time fixes the volute. The telescopic cylinder 5 extends to push the side sealing device to seal the volute. The drain outlet 8 and the lower sealing device seal the motor side 6 of the volute housing; at the same time, the side sealing device is equipped with an air inlet pipe 9. Compressed air from the air source enters the volute housing through the air inlet pipe 9 to test the air tightness of the volute housing. The volute housing is filled with a set air pressure value and maintained for a set time. The value of the air pressure drop is observed. If the air pressure drop value is within the specified range within the specified time, it means that the air tightness of the volute housing is qualified; otherwise, the air tightness of the volute housing is unqualified. The lower sealing device in this application corresponds to the lower mold in the background art, the upper sealing device corresponds to the upper mold in the background art, and the side sealing device corresponds to the test head in the background art.

[0032] In practical use, when testing the airtightness of volutes of different specifications, it is often necessary to replace the upper sealing device, lower sealing device, and side sealing device. In particular, the lower sealing device is placed in the mounting groove 2. Because the lower sealing device is tightly fitted to the mounting groove 2 and its upper surface is flush, it is not easy to remove. Even with tools, it is difficult to remove because there is nowhere to exert force. To solve the above problems, in this embodiment, the mounting groove 2 of the workbench 1 is also provided with a pop-out mechanism, a locking mechanism, and a triggering mechanism. When in use, the lower sealing device is placed in the mounting groove 2 and pressed down. The lower sealing device compresses the pop-out mechanism, and the locking mechanism locks the pop-out mechanism, so that the lower sealing device is installed in the mounting groove 2. When the lower sealing device needs to be replaced, the triggering mechanism is pressed, so that the locking mechanism releases the locking mechanism from the pop-out mechanism. The pop-out mechanism pops the lower sealing device upward, so that the lower sealing device is pushed out of the mounting groove 2 to a set height, thereby making it easy to remove the lower sealing device.

[0033] In this embodiment, a base 10 is fixedly mounted on the lower end face of the workbench 1, and a receiving groove 11 is opened on the upper end face of the base 10 at a position corresponding to the mounting groove 2. The pop-out mechanism includes a plurality of guide rods 12 that pass through the mounting groove 2 of the workbench 1 in the vertical direction, and a plate 13 that is fixedly mounted in the receiving groove 11 and fixed to the bottom end of each guide rod 12. A plurality of first springs 14 are fixedly mounted on the lower end face of the plate 13, and the bottom end of each first spring 14 is fixedly mounted to the inner bottom wall of the receiving groove 11 of the base 10. A locking pin 15 is fixedly mounted on the side of the plate 13. When the lower sealing device is placed in the mounting groove 2, the lower sealing device presses down. Each guide rod 12 drives the plate 13 to press down, causing the plate 13 to compress each first spring 14. When the lower sealing device is completely in the mounting groove 2, the locking mechanism locks the locking pin 15, locking the position of the plate 13, thus allowing the lower sealing device to be installed in the mounting groove 2. When the lower sealing device needs to be replaced, the trigger mechanism is pressed, causing the locking mechanism to release the locking pin 15, causing the first spring 14 to push the plate 13 upward, and the plate 13 pushes each guide rod 12 upward, causing the guide rod 12 to push the lower sealing device upward to a set height, making it easy to remove the lower sealing device.

[0034] In this embodiment, Figure 9Based on this, the locking mechanism includes a locking plate 16 that slides in the left-right direction. The locking plate 16 has a locking groove, which includes a straight groove 17 and a square groove 18 located at the bottom of the straight groove 17. A first driving inclined surface 19 is provided on the left side wall of the straight groove 17. An elongated hole 20 is provided in the left-right direction on the locking plate 16. A first fixing pin 21 is fixedly provided on the inner side wall of the receiving groove 11 of the base 10. The first fixing pin 21 is located in the elongated hole 20. A second fixing pin 22 is fixedly provided on the inner side of the locking plate 16. A second spring 23 is fixedly provided between the first fixing pin 21 and the second fixing pin 22. The second spring 23 is in a stretched state. The second spring 23 always pulls the locking plate 16 to the right through the second fixing pin 22, so that the first fixing pin 21 is located at the left end of the elongated hole 20. The elongated hole 20 prevents the locking plate 16 from sliding to the right. A driving groove 24 is provided on the locking plate 16 located on the right side of the locking groove.

[0035] In use, the lower sealing device is placed into the mounting groove 2. The lower sealing device presses down the guide rod 12, which drives the plate 13 to move downward. The plate 13 compresses each of the first springs 14. As the plate 13 moves downward, it drives the locking pin 15 downward, causing the locking pin 15 to act on the first driving inclined surface 19, which causes the locking plate 16 to move to the left. As the plate 13 moves downward, the locking pin 15 enters the straight groove 17. The plate 13 continues to move downward, causing the locking pin 15 to enter the square groove 18. At this time, the second spring 23 pulls the second fixing pin 22 to move to the right, which in turn drives the locking plate 16 to move to the right, causing the locking pin 15 to enter the left side of the square groove 18. At this time, the locking plate 16 locks the locking pin 15. A spring 14 pushes the plate 13 upward, which in turn moves the locking pin 15 upward. This causes the locking pin 15 to be pressed against the inner top wall of the square groove 18, preventing it from moving upward and thus preventing the plate 13 from moving upward. This achieves the purpose of placing the lower sealing device in the mounting groove 2. When the lower sealing device needs to be replaced, pressing the trigger mechanism causes it to drive the locking plate 16 to move to the left through the drive groove 24. When the locking pin 15 is in the straight groove 17, the first spring 14 pushes the plate 13 upward, and the locking pin 15 moves upward in the straight groove 17. This causes the plate 13 to move the guide rod 12 upward, so that the guide rod 12 pushes the lower sealing device out of the mounting groove 2 to a set height, making it easier to remove the lower sealing device.

[0036] In this embodiment, the triggering mechanism includes a button 25 that slides vertically within the base 10. The bottom end of the button 25 extends into the receiving groove 11. A drive rod 26 is radially fixed to the bottom end of the button 25. A second drive ramp 27 is provided on the left side wall of the drive groove 24, and the drive rod 26 is located within the drive groove 24. When the lower sealing device is installed in the mounting groove 2, the drive rod 26 is located within the drive groove 24 and contacts the second drive ramp 27. When the lower sealing device needs to be removed, the button 25 is pressed down, causing the button 25 to drive the drive rod 26 to move downward. The drive rod 26 drives the locking plate 16 to move to the left via the second drive ramp 27. When the locking pin 15 is located within the straight groove 17, the first spring 14 pushes the plate 13 upward. The locking pin 15 moves upward within the straight groove 17, causing the plate 13 to drive the guide rod 12 upward. The guide rod 12 pushes the lower sealing device out of the mounting groove 2 to a set height, making it easier to remove the lower sealing device.

[0037] In this embodiment, a third spring 28 is fixedly provided on the lower end face of the button 25. When the button 25 is pressed down, the third spring 28 is compressed. When it is released, the third spring 28 pushes the button 25 to move upward, so that the button 25 is reset. At the same time, the locking plate 16 is also moved downward and to the right by the pull of the second spring 23 to reset. The drive rod 26 simultaneously limits the maximum height of the button 25 moving upward.

[0038] In this embodiment, a limiting rod is fixedly provided at the bottom end of the button 25. The limiting rod extends downward into the slide groove 29 opened in the base 10, and a circular plate 30 is fixedly provided at the bottom end of the limiting rod. The circular plate 30 slides in the slide groove 29. When the button 25 is pressed, the button 25 compresses the third spring 28 and drives the limiting rod to move downward, so that the limiting rod drives the circular plate 30 to slide up and down in the slide groove 29, which increases the stability of the button 25 moving up and down.

[0039] In this embodiment, the lower sealing device includes a sealing plate 31, and an annular groove 32 is formed on the upper end surface of the sealing plate 31. A sealing ring 33 is embedded in the annular groove 32. In use, the motor side 6 of the volute is placed on the sealing plate 31, so that the sealing ring 33 seals the motor side 6 of the volute.

[0040] In this embodiment, the upper sealing device includes a pressing plate 34 and a disc 35. The pressing plate 34 is fixedly arranged at the output end of the hydraulic telescopic rod 4. A plurality of bolts 36 are fixedly arranged on the upper end surface of the disc 35. The bolts 36 are all sleeved with the pressing plate 34, and nuts 37 are threadedly connected to the bolts 36 located above the pressing plate 34. A set distance is spaced between the disc 35 and the pressing plate 34. A plurality of fourth springs 38 are fixedly arranged between the disc 35 and the pressing plate 34. The fourth springs 38 are in a compressed state. A pressing head 39 is fixedly arranged on the lower end surface of the disc 35. A plugging pipe 40 is sleeved on the pressing head 39. The plugging pipe 40 is tightly sleeved with the pressing head 39, which is convenient for disassembly and at the same time convenient for sleeved installation. The plugging pipe 40 is used to plug the water inlet 7 of the volute. During use, the hydraulic telescopic rod 4 extends to drive the pressing plate 34 to move downward, so that the pressing plate 34 drives the disc 35, the pressing head 39 and the plugging pipe 40 to move downward, so that the plugging pipe 40 moves downward to plug the water inlet 7 of the volute. The pressing plate 34 can be compressed downward, so that the fourth spring 38 is further compressed to increase the contact force between the plugging pipe 40 and the water inlet 7 of the volute and increase the sealing performance. The seal between the plugging pipe 40 and the water inlet 7 can be realized through a sealing rubber ring.

[0041] In this embodiment, the side sealing device includes an air storage tank 41 fixedly arranged at the output end of the telescopic cylinder 5. A sleeve 42 communicating with the inside of the air storage tank 41 is fixedly arranged on the right side surface of the air storage tank 41. A butt joint pipe 43 is sleeved in the sleeve 42. The butt joint pipe 43 is tightly sleeved with the sleeve 42, which realizes watertightness and is convenient for pulling out and inserting and convenient for replacement. During use, the volute is placed on the sealing plate 31. First, the hydraulic telescopic rod 4 presses downward to make the plugging pipe 40 dock with the water inlet 7 of the volute, so as to achieve the purpose of sealing the water inlet 7 of the volute and at the same time fix the volute. Then the telescopic cylinder 5 extends to drive the air storage tank 41 to move to the right, so that the air storage tank 41 drives the butt joint pipe 43 to dock with the drain outlet 8 of the volute. Then compressed air enters the air storage tank 41, and the compressed air enters the volute from the butt joint pipe 43, so that the pressure value in the volute reaches the set value. The compressed air is closed and kept for the set time. Then observe the value of the pressure drop. Within the specified time, if the value of the pressure drop is within the specified range, it means that the airtightness of the volute is qualified; otherwise, the airtightness of the volute is unqualified. Similarly, the seal between the butt joint pipe 43 and the drain outlet 8 can also be realized through a sealing rubber ring, which belongs to the prior art and will not be elaborated here.

[0042] In this embodiment, a display screen 44, a start button 45 and an emergency stop button 46 are installed on the front side surface of the base 10. The display screen 44 is used to display the detection result.

Claims

1. A device for detecting the airtightness of a water pump casing, characterized in that: The system includes a workbench (1), an installation groove (2) on the upper surface of the workbench (1), a lower sealing device in the installation groove (2), a hydraulic telescopic rod (4) fixedly mounted above the workbench (1) by several support columns (3), an upper sealing device at the output end of the hydraulic telescopic rod (4), a telescopic cylinder (5) fixedly mounted on the upper surface of the workbench (1), and a side sealing device at the output end of the telescopic cylinder (5); the upper sealing device is used to seal the water inlet (7) of the volute, the side sealing device is used to seal the drain outlet (8) of the volute, and the lower sealing device is used to seal the motor side (6) of the volute; an air inlet pipe (9) is provided on the side sealing device; the workbench (1) is also equipped with a pop-out mechanism, a locking mechanism and a triggering mechanism, the lower sealing device compresses the pop-out mechanism while the locking mechanism locks the pop-out mechanism, so that the lower sealing device is installed in the installation groove (2); pressing the triggering mechanism releases the locking mechanism from locking the pop-out mechanism, and the pop-out mechanism pops the lower sealing device upward.

2. The water pump casing airtightness testing device according to claim 1, characterized in that: The workbench (1) is fixedly provided with a base (10) on its lower end face. The upper end face of the base (10) is provided with a receiving groove (11) corresponding to the mounting groove (2). The pop-out mechanism includes a number of guide rods (12) that pass through the mounting groove (2) of the workbench (1) in the vertical direction, and a plate (13) that is fixedly provided in the receiving groove (11) with the bottom end of each guide rod (12). A number of first springs (14) are fixedly provided on the lower end face of the plate (13). The bottom end of each first spring (14) is fixedly provided with the inner bottom wall of the receiving groove (11) of the base (10). A locking pin (15) is fixedly provided on the side of the plate (13).

3. The water pump casing airtightness testing device according to claim 2, characterized in that: The locking mechanism includes a locking plate (16) that is slidably disposed on the bottom wall of the receiving groove (11) in the left-right direction. The locking plate (16) has a locking groove, which includes a straight groove (17) and a square groove (18) located at the bottom of the straight groove (17). A first driving inclined surface (19) is provided on the left side wall of the straight groove (17). An elongated hole (20) is provided on the locking plate (16) in the left-right direction. A first fixing pin (21) is fixedly disposed on the inner side wall of the receiving groove (11) of the base (10). 1) A second fixing pin (22) is fixedly provided on the inner side of the locking plate (16) inside the elongated hole (20), and a second spring (23) is fixedly provided between the first fixing pin (21) and the second fixing pin (22); the second spring (23) is in a stretched state, and the second spring (23) always pulls the locking plate (16) to the right through the second fixing pin (22), so that the first fixing pin (21) is located at the left end of the elongated hole (20); a drive groove (24) is provided on the locking plate (16) located on the right side of the locking groove.

4. The water pump casing airtightness testing device according to claim 3, characterized in that: The triggering mechanism includes a button (25) that is slidably disposed in the base (10) in the up-down direction. The bottom end of the button (25) extends into the receiving groove (11). A drive rod (26) is fixedly disposed radially at the bottom end of the button (25). A second drive slope (27) is provided on the left side wall of the drive groove (24). The drive rod (26) is located in the drive groove (24). When the sealing device is installed in the mounting groove (2), the drive rod (26) is located in the drive groove (24) and contacts the second drive slope (27).

5. The water pump casing airtightness testing device according to claim 4, characterized in that: A third spring (28) is fixedly provided on the lower end face of the button (25).

6. The water pump casing airtightness testing device according to claim 5, characterized in that: The bottom end of the button (25) is fixedly provided with a limiting rod, which extends downward into the slide groove (29) opened in the base (10), and the bottom end of the limiting rod is fixedly provided with a circular plate (30), which slides in the slide groove (29).

7. The water pump casing airtightness testing device according to claim 1, characterized in that: The lower sealing device includes a sealing plate (31), and an annular groove (32) is formed on the upper end surface of the sealing plate (31), and a sealing ring (33) is embedded in the annular groove (32).

8. The water pump casing airtightness testing device according to claim 1, characterized in that: The upper sealing device includes a pressure plate (34) and a disc (35). The pressure plate (34) is fixedly installed at the output end of the hydraulic telescopic rod (4). Several bolts (36) are fixedly installed on the upper surface of the disc (35). The bolts (36) are all sleeved with the pressure plate (34), and the bolts (36) located above the pressure plate (34) are threaded with nuts (37). The disc (35) and the pressure plate (34) are spaced at a set distance. Several fourth springs (38) are fixedly installed between the disc (35) and the pressure plate (34). The fourth springs (38) are in a compressed state. A pressure head (39) is fixedly installed on the lower surface of the disc (35). A sealing tube (40) is sleeved on the pressure head (39). The sealing tube (40) is tightly sleeved with the pressure head (39). The sealing tube (40) is used to seal the water inlet (7) of the volute.

9. The water pump casing airtightness testing device according to claim 1, characterized in that: The side sealing device includes an air storage box (41) fixedly installed at the output end of the telescopic cylinder (5), a sleeve (42) connected to the inside of the air storage box (41) is fixedly installed on the right side of the air storage box (41), and a connecting pipe (43) is sleeved inside the sleeve (42); the connecting pipe (43) seals the water inlet (7) of the volute.

10. The pump casing airtightness testing device according to claim 2, characterized in that: The base (10) is equipped with a display screen (44), a start button (45) and an emergency stop button (46) on its front side.

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