A water pump back cover air tightness detection device

Abstract

This utility model discloses a water pump rear cover airtightness testing device, belonging to the field of water pump manufacturing technology. It includes a testing device body with two air pipes. Each air pipe has a quick connector at its end furthest from the testing device body. The two quick connectors are used to connect to the water pump's drain pipe and inlet pipe, respectively. Each quick connector includes a cylindrical body, which is fixedly connected to the corresponding air pipe via the connector. A central tube is coaxially fixed inside the cylindrical body. In use, the cylindrical body is fitted onto the inlet or drain pipe, and then a locking mechanism, engaging with an annular protrusion, locks the cylindrical body to the inlet or drain pipe. Simultaneously, the inlet or drain pipe connects to the outer end of the central tube, establishing communication between the inlet or drain pipe and the quick connector. The testing device body can inflate the pump chamber through the air pipes and quick connectors to achieve the testing purpose. The locking mechanism ensures a stable connection and good airtightness.

Description

Technical Field

[0001] This utility model relates to the body of an airtightness testing device, and more particularly to an airtightness testing device for a water pump rear cover. Background Technology

[0002] In the manufacturing of water pumps, the volute of a centrifugal water pump is generally manufactured through casting. After the volute is formed, it undergoes precision machining, milling out the flange faces of the inlet and outlet pipes and the assembly surface where the volute mates with the rear cover. Then, the volute is subjected to an airtightness test, which requires sealing the inlet and outlet pipes and the assembly surface between the volute and the rear cover. After that, it is pressurized and pressure is maintained, and the pressure drop is observed to perform an airtightness test. The airtightness test of the rear cover refers to the airtightness of the assembly gap after the rear cover and the volute are assembled and fixed, as well as the airtightness of the mechanical shaft seal on the rear cover. After the volute and the rear cover are fixed, the motor is fixed on the rear cover, and the output shaft of the motor passes through the rear cover and is fixed to the impeller. A mechanical shaft seal is installed between the output shaft of the motor and the rear cover.

[0003] When testing the air tightness of the back cover, the air pipe is usually connected to the inlet and outlet pipes through the existing quick connector. Since the quick connector is connected entirely by the pressure of the spring, the air tightness between the inlet and outlet pipes and the quick connector is insufficient, and air leakage often occurs at the connection, which affects the accuracy of the air tightness test. Utility Model Content

[0004] The purpose of this invention is to provide a water pump rear cover airtightness testing device, which has the advantages of quick connection between the air pipe and the inlet / outlet pipe during testing and good airtightness, effectively solving the problem of air leakage at the quick connector in the prior art.

[0005] This utility model adopts the following technical solution: a water pump rear cover airtightness testing device, characterized in that: it includes a testing device body, on which two air pipes are provided, and each air pipe has a quick connector at the end away from the testing device body. The two quick connectors are respectively used to connect to the water pump's drain pipe and inlet pipe. The quick connector includes a cylinder, which is fixedly connected to the corresponding air pipe through the connector. A central tube is coaxially fixedly arranged inside the cylinder, and an annular cavity is formed between the central tube and the cylinder. A through hole is opened on the central tube to connect the interior of the central tube and the annular cavity. A locking mechanism is provided between the central tube and the cylinder. The locking mechanism cooperates with the annular protrusion to lock the cylinder to the inlet pipe or drain pipe. At the same time, the inlet pipe or drain pipe is connected to the outer end of the central tube.

[0006] Furthermore, the locking mechanism includes a plurality of spheres evenly arranged along the circumference of the cylinder, and a piston body is sleeved on the central tube.

[0007] Furthermore, an annular support is fixedly provided on the inner wall of the left end of the cylinder. Several receiving holes are evenly opened in the support along the circumferential direction. The opening of the receiving hole near the center of the cylinder is smaller than the opening away from the center of the cylinder. Each sphere is set in the corresponding receiving hole.

[0008] Furthermore, the support extends to the right and enters between the piston body and the central tube, with the piston body slidably connected to both the central tube and the support.

[0009] Furthermore, a return spring is provided on the right side of the support body around the central tube. The return spring pushes the piston body to move to the right, so that the through hole of the central tube is covered by the piston body and is not connected to the connector.

[0010] Furthermore, a connector is slidably provided inside the central tube in the left-right direction, and a pressure spring is provided on the right side of the connector, with the pressure spring in a compressed state.

[0011] Furthermore, a lip plate is fixedly provided on the right side of the outer surface of the connector. The lip plate is slidably disposed in the hole inside the central tube. A limit plate is fixedly provided on the left side of the inner wall of the central tube. A pressure spring pushes the lip plate to move to the left and abut against the limit plate. The connector protrudes from the left side of the limit plate.

[0012] Furthermore, a step is fixedly provided on the right side inside the central tube, and a blind hole is coaxially opened on the left side of the step.

[0013] Furthermore, the left end of the pressure spring abuts against the lip plate, the right end of the pressure spring abuts against the step, and the through hole connects the blind hole and the annular cavity.

[0014] Furthermore, the detection device body is equipped with start, stop, and pressure holding buttons.

[0015] I. This utility model, by setting up a cylinder, a central tube, and a locking mechanism, allows the cylinder to be fitted onto the inlet or outlet pipe during use. Then, the locking mechanism, in conjunction with the annular protrusion, locks the cylinder to the inlet or outlet pipe. Simultaneously, the inlet or outlet pipe connects to the outer end of the central tube, enabling the connection between the inlet or outlet pipe and the quick connector. The detection device body can be inflated into the pump chamber of the water pump through the air pipe and the quick connector to achieve the detection purpose. The locking mechanism achieves a stable connection and good airtightness.

[0016] II. This utility model, by setting up a cylinder, a ball, a central tube, and a piston, is used by first fitting the cylinder onto the inlet or outlet pipe, so that the ball is located on the left side of the annular protrusion. Activating the detection device allows compressed air to enter the annular chamber on the right side of the piston, pushing the piston to the left. The piston forces the ball to move radially inward, causing each ball to press against the left side of the annular protrusion. This forces the cylinder to move further to the left relative to the inlet or outlet pipe, locking the cylinder to the inlet or outlet pipe. Simultaneously, the inlet or outlet pipe abuts against the left end of the central tube, establishing communication between the inlet or outlet pipe and the central tube. Then, compressed air enters the pump chamber of the water pump for airtightness testing. Because the compression of the ball is achieved through the force of compressed air, it has the advantages of stable connection and good airtightness compared to the springs in existing technologies. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a front view structural diagram of the present utility model; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the cylinder in this utility model; Figure 4 This is a schematic diagram of the internal three-dimensional structure of the piston body in this utility model; Figure 5 This is a schematic diagram of the internal three-dimensional structure of the central tube in this utility model; Figure 6 This is a three-dimensional structural diagram of the connector and lip plate in this utility model.

[0018] In the diagram, 1. Volute; 2. Rear cover; 3. Water inlet pipe; 4. Drain pipe; 5. Bolt; 6. Motor; 7. Annular protrusion; 8. Detection device body; 9. Air pipe; 10. Quick connector; 11. Cylinder; 12. Connector; 13. Central tube; 14. Annular chamber; 15. Through hole; 16. Ball; 17. Piston body; 18. Support body; 19. Accommodation hole; 20. Return spring; 21. Connector; 22. Pressure spring; 23. Lip plate; 24. Limiting plate; 25. Step; 26. Blind hole. Detailed Implementation

[0019] Please see Figure 1-6 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The existing water pump includes a volute 1 and a rear cover 2. An inlet pipe 3 is coaxially arranged on the outer side of the volute 1, and a drain pipe 4 is arranged on one side of the circumferential surface of the volute 1. The rear cover 2 is fixed to the volute 1 by bolts 5, so that the rear cover 2 seals the opening of the volute 1 and forms a pump chamber with the volute 1. A motor 6 is fixedly arranged on the outer side of the rear cover 2. The output shaft of the motor 6 passes through the rear cover 2 and is fixedly arranged with the impeller in the pump chamber. A shaft seal is installed between the output shaft of the motor 6 and the rear cover 2. There are various types of shaft seals, and the most commonly used one is the mechanical shaft seal. The ends of the inlet pipe 3 and the drain pipe 4 are both provided with annular protrusions 7 for connecting to water pipes.

[0020] The water pump rear cover airtightness testing device of this utility model includes a testing device body 8, on which two air pipes 9 are provided. Each air pipe 9 has a quick connector 10 at its end furthest from the testing device body 8. The two quick connectors 10 are respectively used to connect to the water pump's drain pipe 4 and inlet pipe 3. Then, the testing device body 8 is activated, and air is injected into the pump chamber of the water pump through the air pipes 9. The pressure is maintained, and the pressure drop in the pump chamber is observed within a set time. If the pressure drop value is within the specified range, the airtightness test is qualified; if the pressure drop value exceeds the specified range, the airtightness test is unqualified. The airtightness test covers the airtightness of the assembly gap between the volute 1 and the rear cover 2 after they are fixed by bolts 5, the airtightness of the mechanical shaft seal installed between the rear cover 2 and the output shaft of the motor 6, and the airtightness of the materials of the volute 1 and the rear cover 2 themselves. In the production of water pumps, there is another process that only tests the airtightness of the volute 1, which tests the airtightness of the material of the volute 1 itself. However, the airtightness test of the rear cover 2 requires that it be installed with the volute 1, and then the motor 6 and the mechanical shaft seal are installed before the airtightness of the rear cover 2 can be tested. The main tests are the airtightness of the assembly gap between the volute 1 and the rear cover 2 after they are fixed, as well as the airtightness of the mechanical shaft seal.

[0021] In this embodiment, the quick connector 10 includes a cylindrical body 11, which is fixedly connected to the corresponding air pipe 9 via a connector 12. A central tube 13 is coaxially fixedly disposed inside the cylindrical body 11, forming an annular chamber 14 between the central tube 13 and the cylindrical body 11. A through hole 15 is provided on the central tube 13 to connect the interior of the central tube 13 and the annular chamber 14. A locking mechanism is provided between the central tube 13 and the cylindrical body 11. The locking mechanism cooperates with the annular protrusion 7 to lock the cylindrical body 11 to the water inlet pipe 3 or the drain pipe 4. The inlet pipe 3 or the drain pipe 4 is connected to the outer end of the central pipe 13. In use, the cylinder 11 is fitted onto the inlet pipe 3 or the drain pipe 4, and then the cylinder 11 is locked to the inlet pipe 3 or the drain pipe 4 by the locking mechanism and the annular protrusion 7. At the same time, the inlet pipe 3 or the drain pipe 4 is connected to the outer end of the central pipe 13, so that the inlet pipe 3 or the drain pipe 4 is connected to the quick connector 10. The detection device body 8 can be inflated into the pump chamber of the water pump through the air pipe 9 and the quick connector 10 to achieve the purpose of detection.

[0022] In this embodiment, the angular directional term is used as... Figure 5 Based on this, the locking mechanism includes a plurality of balls 16 evenly arranged around the circumference of the cylinder 11, and a piston body 17 is fitted onto the central tube 13. In use, the cylinder 11 is first fitted onto the inlet pipe 3 or the drain pipe 4, so that the balls 16 are located to the left of the annular protrusion 7. The detection device body 8 is equipped with start, stop, and pressure holding buttons. Activating the detection device body 8 allows compressed air to enter the annular chamber 14 to the right of the piston body 17 through the air pipe 9 and the connector 12, causing the compressed air to push the piston body 17 to move to the left. When the left end of the piston body 17 reaches the ball 16, the piston body 17 forces the ball 16 to move radially towards the center of the cylinder 11, so that each ball 16 presses against the left side of the annular protrusion 7, forcing the cylinder 11 further relative to the inlet pipe 3 or the drain pipe 4. The piston moves to the left, locking the cylinder 11 to the inlet pipe 3 or the drain pipe 4. At the same time, the inlet pipe 3 or the drain pipe 4 abuts against the left end of the central pipe 13, connecting the inlet pipe 3 or the drain pipe 4 to the interior of the central pipe 13. When the piston 17 moves to the left, the through hole 15 on the central pipe 13 is exposed in the annular chamber 14 on the right side of the piston 17. At this time, the compressed air from the connector 12 accumulates in the annular chamber 14 on the right side of the piston 17. The compressed air in the annular chamber 14 enters the interior of the central pipe 13 through the through hole 15 and then enters the inlet pipe 3 or the drain pipe 4, and then enters the pump chamber of the water pump, achieving the purpose of inflating the pump chamber. The spring force that drives the ball 16 to move in the prior art is replaced by the force of compressed air, which improves the reliability and airtightness of the quick connector 10 connection.

[0023] In this embodiment, an annular support 18 is fixedly provided on the inner wall of the left end of the cylinder 11. A plurality of receiving holes 19 are evenly opened in the support 18 along the circumferential direction. The opening of the receiving hole 19 near the center of the cylinder 11 is smaller than the opening away from the center of the cylinder 11. Each ball 16 is set in the corresponding receiving hole 19. When in use, the piston body 17 slides to the left to press the balls 16 to move radially toward the center of the cylinder 11, so that each ball 16 squeezes the annular protrusion 7, thereby locking the cylinder 11 with the water inlet pipe 3 or the drain pipe 4.

[0024] In this embodiment, the support body 18 extends to the right and enters between the piston body 17 and the central tube 13. The piston body 17 slides on the support body 18 while sliding left and right on the central tube 13, which increases the stability of the piston body 17's movement.

[0025] In this embodiment, a return spring 20 is provided on the right side of the support body 18 around the central tube 13. The return spring 20 pushes the piston body 17 to move to the right, so that the through hole 15 of the central tube 13 is covered by the piston body 17 and is not connected to the connector 12. This achieves the purpose of not connecting the interior of the central tube 13 to the air pipe 9 when not in use. When in use, the cylinder 11 is first fitted onto the water inlet pipe 3 or the drain pipe 4, and then compressed air is introduced. The compressed air enters the annular chamber 14 on the right side of the piston body 17. The piston body 17 slides to the left under the push of the compressed air, so that the piston body 17 overcomes the force of the return spring 20. Slide to the left until the left end of the piston body 17 squeezes the ball 16, causing the ball 16 to engage with the left side of the annular protrusion 7, thus locking the cylinder 11 with the water inlet pipe 3 or the drain pipe 4. At this time, the through hole 15 of the central tube 13 is exposed in the annular chamber 14 on the right side of the piston body 17, so that the air pipe 9, connector 12, annular chamber 14, through hole 15 and the interior of the central tube 13 are connected. Compressed air enters the water inlet pipe 3 or the drain pipe 4 from the air pipe 9, connector 12, annular chamber 14, through hole 15 and the interior of the central tube 13 in sequence, and then enters the pump chamber to achieve the purpose of filling and maintaining pressure in the pump chamber.

[0026] In this embodiment, a connector 21 is slidably disposed inside the central tube 13 in the left-right direction. A pressure spring 22 is disposed on the right side of the connector 21. The pressure spring 22 is in a compressed state. A lip plate 23 is fixedly disposed on the right side of the outer surface of the connector 21. The lip plate 23 is slidably disposed in the hole inside the central tube 13. A limit plate 24 is fixedly disposed on the left side of the inner wall of the central tube 13. The pressure spring 22 pushes the lip plate 23 to move to the left and abut against the limit plate 24. The connector 21 protrudes from the left side of the limit plate 24. In use, when the water inlet pipe 3 or the drain pipe 4 is inserted into the cylinder 11, the water inlet pipe 3 or the drain pipe 4 presses against the connector 21, causing the connector 21 to slide to the right through the lip plate 23 to further compress the pressure spring 22. By setting the pressure spring 22, the contact force between the connector 21 and the water inlet pipe 3 or the drain pipe 4 is increased, and the airtightness of the contact point between the connector 21 and the water inlet pipe 3 or the drain pipe 4 is improved.

[0027] In this embodiment, a step 25 is fixedly provided on the right side inside the central tube 13, and a blind hole 26 is coaxially opened on the left side of the step 25. The left end of the pressure spring 22 abuts against the lip plate 23, and the right end of the pressure spring 22 abuts against the step 25. The through hole 15 connects the blind hole 26 and the annular chamber 14. When not in use, the through hole 15 is connected to the interior of the piston body 17. When in use, the piston body 17 moves to the left, and the through hole 15 connects to the annular chamber 14 on the right side of the piston body 17.

[0028] The working principle of this utility model is as follows: In use, the cylinder 11 is first fitted onto the inlet pipe 3 or the drain pipe 4, and then compressed air is introduced. The compressed air enters the annular chamber 14 on the right side of the piston body 17. The piston body 17 slides to the left under the push of the compressed air, so that the piston body 17 overcomes the force of the return spring 20 and slides to the left until the left end of the piston body 17 squeezes the ball 16, so that the ball 16 is stuck into the left side of the annular protrusion 7, thereby locking the cylinder 11 with the inlet pipe 3 or the drain pipe 4. At this time, the through hole 15 of the central tube 13 is exposed in the annular chamber 14 on the right side of the piston body 17, so that the air pipe 9, the connector 12, the annular chamber 14, the through hole 15 and the interior of the central tube 13 are connected. The compressed air enters the inlet pipe 3 or the drain pipe 4 from the air pipe 9, the connector 12, the annular chamber 14, the through hole 15 and the interior of the central tube 13 in sequence, and then enters the pump chamber to achieve the purpose of inflating and maintaining the pressure in the pump chamber.

Claims

1. A water pump rear cover air tightness detection device, characterized in that: The device includes a detection device body (8), on which two air pipes (9) are provided. Each air pipe (9) has a quick connector (10) at the end away from the detection device body (8). The two quick connectors (10) are used to connect to the drain pipe (4) and the inlet pipe (3) of the water pump, respectively. The quick connector (10) includes a cylinder (11), which is fixedly connected to the corresponding air pipe (9) through a connector (12). A central hub is coaxially fixed inside the cylinder (11). A ring chamber (14) is formed between the tube (13), the central tube (13) and the cylinder (11). A through hole (15) is provided on the central tube (13) to connect the inside of the central tube (13) and the ring chamber (14). A locking mechanism is provided between the central tube (13) and the cylinder (11). The locking mechanism cooperates with the annular protrusion (7) to lock the cylinder (11) to the water inlet pipe (3) or the drain pipe (4). At the same time, the water inlet pipe (3) or the drain pipe (4) is connected to the outer end of the central tube (13).

2. The water pump rear cover air tightness detection device according to claim 1, characterized in that: The locking mechanism includes a number of spheres (16) evenly arranged on the cylinder (11) along the circumference, and a piston body (17) is sleeved on the central tube (13).

3. The water pump rear cover air tightness detection device according to claim 2, characterized in that: An annular support (18) is fixedly provided on the inner wall of the left end of the cylinder (11). Several receiving holes (19) are evenly opened in the support (18) along the circumferential direction. The opening of the receiving hole (19) near the center of the cylinder (11) is smaller than the opening away from the center of the cylinder (11). Each sphere (16) is set in the corresponding receiving hole (19).

4. The water pump rear cover airtightness testing device according to claim 3, characterized in that: The support (18) extends to the right and enters between the piston body (17) and the central tube (13). The piston body (17) is slidably connected to the central tube (13) and the support (18).

5. The water pump rear cover airtightness testing device according to claim 3, characterized in that: The right side of the support (18) is provided with a return spring (20) around the central tube (13). The return spring (20) pushes the piston (17) to move to the right, so that the through hole (15) of the central tube (13) is covered by the piston (17) and is not connected to the connector (12).

6. The water pump rear cover air tightness detection device according to claim 1, characterized in that: The central tube (13) is provided with a connector (21) that slides in the left and right direction. A pressure spring (22) is provided on the right side of the connector (21) and the pressure spring (22) is in a compressed state.

7. The water pump rear cover air tightness detection device according to claim 1, characterized in that: A lip plate (23) is fixedly provided on the right side of the outer surface of the connector (21). The lip plate (23) is slidably provided in the hole inside the central tube (13). A limit plate (24) is fixedly provided on the left side of the inner wall of the central tube (13). A pressure spring (22) pushes the lip plate (23) to move to the left and abut against the limit plate (24). The connector (21) protrudes from the left side of the limit plate (24).

8. The water pump rear cover airtightness testing device according to claim 7, characterized in that: A step (25) is fixedly provided on the right side inside the central tube (13), and a blind hole (26) is coaxially provided on the left side of the step (25).

9. The water pump rear cover air tightness detection device according to claim 8, characterized in that: The left end of the pressure spring (22) abuts against the lip plate (23), the right end of the pressure spring (22) abuts against the step (25), and the through hole (15) connects the blind hole (26) and the annular chamber (14).

10. The water pump rear cover air tightness detection device of claim 1, wherein: The detection device body (8) is provided with start, stop and pressure maintaining buttons.

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