A test fixture for air tightness of automotive electronic water pump heads

Abstract

This utility model relates to a test fixture for the airtightness of an automotive electronic water pump head, comprising a lower seat and an upper seat. A pump head base is mounted on the upper end of the lower seat, and a circular inner cavity is formed at the upper end of the pump head base. A step is arranged around the opening at the upper end of the circular inner cavity. A channel communicating with the circular inner cavity is formed on the left side of the pump head base. A positioning block is embedded in front of the channel at the upper end of the pump head base, and one end of the positioning block extends onto the step. A circular groove is formed in the middle of the bottom surface of the circular inner cavity, and a small annular pipe-mouth sealing gasket is embedded in the middle of the circular groove. A slider and a power cylinder for driving the slider to slide laterally are mounted on the upper end of the lower seat on the left side of the pump head base. A sealing plug inserted into the channel is provided at one end of the slider. A sealing upper plug inserted into the circular inner cavity is mounted on the lower end of the upper seat, and a large pipe-mouth sealing gasket is arranged around the sealing upper plug at the lower end of the upper seat.

Description

Technical Field

[0001] This utility model relates to the field of automotive electronic water pump head air tightness testing technology, and in particular to an automotive electronic water pump head air tightness testing fixture. Background Technology

[0002] The automotive electric water pump is a core component of the vehicle's cooling system, and the airtightness of its pump head directly determines the cooling system's heat dissipation efficiency and operational stability. If the pump head has airtightness defects, it can lead to coolant leakage, causing engine overheating, power loss, and even damage to core engine components. Therefore, automotive electric water pumps must undergo rigorous airtightness testing of their pump heads before leaving the factory.

[0003] There are many types of automotive electronic water pump heads, and their structures vary. For example... Figure 7-8 As shown, the automotive electronic water pump head includes a pump head body 9, which has a main chamber 30. A large inlet 26 is provided at the upper end of the main chamber 30, and a flange 27 is arranged around the outer edge of the large inlet 26. A notch 28 is provided on the flange 27. A side inlet 29 communicating with the main chamber 30 is provided on the lower side of the pump head body 9, and a small inlet 31 communicating with the main chamber 30 is provided in the middle of the bottom surface of the pump head body 9. A test fixture needs to be designed for this automotive electronic water pump head structure. Existing test fixtures mostly use a single sealing method of rubber plugs or O-rings, which is difficult to adapt to the sealing requirements of pump heads with multiple inlets and irregular contours, and is prone to air leakage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a test fixture for the air tightness of automotive electronic water pump heads. It adopts a sealing structure including a large-port sealing gasket, a small-port sealing gasket, and a sealing side plug. The large-port sealing gasket fits tightly with the large-port through the sealing upper plug, improving assembly stability and sealing surface fit. The small-port sealing gasket is sleeved on the outside of the cylinder to prevent displacement. The sealing side plug is adapted to the channel structure to fully cover the sealing surface of the pump head, effectively preventing air leakage and ensuring the authenticity and reliability of the test results.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A test fixture for the airtightness of an automotive electronic water pump head is provided, including a lower seat and an upper seat. A pump head base is installed on the upper end of the lower seat. A circular inner cavity is formed at the upper end of the pump head base. A step is arranged around the opening at the upper end of the circular inner cavity. A channel communicating with the circular inner cavity is formed on the left side of the pump head base. A positioning block is embedded in front of the channel at the upper end of the pump head base. One end of the positioning block extends onto the step. A circular... The groove has a circular groove in which a small annular tube opening sealing gasket is embedded. The upper end of the lower seat is located on the left side of the pump head base and has a slider and a power cylinder that drives the slider to slide laterally. One end of the slider is provided with a sealing side plug that is inserted into the channel. The lower end of the upper seat is provided with a sealing upper plug that is inserted into the circular inner cavity. A ring of large tube opening sealing gaskets is arranged around the sealing upper plug at the lower end of the upper seat. An air inlet hole is opened in the center of the bottom of the large tube opening sealing gasket. The upper end of the air inlet hole is connected to the air inlet channel provided inside the upper seat.

[0006] As a supplement to the technical solution described in this utility model, a socket is provided at each of the four corners of the lower end of the upper seat, and a limiting post is inserted into each socket. The upper seat and the limiting post are connected and fixed by fasteners.

[0007] As a supplement to the technical solution described in this utility model, a part-removing groove is provided on each of the front and rear sides of the upper end of the pump head base located in the circular inner cavity. The part-removing groove is a through groove.

[0008] As a supplement to the technical solution described in this utility model, the power cylinder is a twin-shaft cylinder.

[0009] As a supplement to the technical solution described in this utility model, the positioning block has a convex-shaped block structure.

[0010] As a supplement to the technical solution described in this utility model, a cylinder is provided in the center of the circular groove, and the small tube opening sealing gasket is sleeved on the outside of the cylinder.

[0011] As a supplement to the technical solution described in this utility model, the side of the upper seat is provided with an interface for connecting the air intake channel.

[0012] As a supplement to the technical solution described in this utility model, a clearance groove is arranged around the bottom of the upper seat around the sealing gasket of the large pipe opening.

[0013] As a supplement to the technical solution described in this utility model, the sealing upper plug is cylindrical in shape, and an insert post is axially arranged on the upper part of the sealing upper plug. The outer diameter of the insert post is smaller than the outer diameter of the sealing upper plug. The upper end of the insert post is inserted into the upper seat and fixed by fasteners. The large pipe opening sealing gasket has a circular structure. A ring groove is arranged at the lower end of the inner hole of the large pipe opening sealing gasket. The large pipe opening sealing gasket is sleeved on the insert post, and the ring groove is engaged with the sealing upper plug.

[0014] Beneficial Effects: This utility model relates to a test fixture for the airtightness of an automotive electronic water pump head. It achieves precise circumferential positioning of the pump head through the cooperation of a convex-shaped positioning block and a step. It employs a sealing structure including a large-port sealing gasket, a small-port sealing gasket, and a sealing-side plug. The large-port sealing gasket fits tightly to the large-port through the sealing plug, improving assembly stability and sealing surface fit. The small-port sealing gasket is fitted outside the cylinder to prevent displacement. The sealing-side plug, with its adaptable channel structure, comprehensively covers the pump head sealing surface, effectively preventing air leakage and ensuring reliable test results. Removal slots are provided on the front and rear sides of the pump head base for convenient and quick removal and placement of the pump head after testing. A dual-axis cylinder is used for the power cylinder, providing smooth and rapid drive, enabling automated sealing and reset, significantly improving testing efficiency and meeting the needs of mass production. Attached Figure Description

[0015] Figure 1 This is a sectional view of the present invention from the main viewing direction; Figure 2 This is a schematic diagram of the structure of the lower seat described in this utility model; Figure 3 This is a schematic diagram of the upper seat described in this utility model; Figure 4 This is a cross-sectional view of the present invention from the left view direction; Figure 5 This is a schematic diagram of the structure of the large-mouth sealing gasket described in this utility model; Figure 6 This is a schematic diagram of the structure of the sealing plug described in this utility model; Figure 7 This is a structural schematic diagram of the test product of this utility model; Figure 8 This is a structural schematic diagram of the test product of this utility model from different angles.

[0016] Diagram: 1. Lower seat, 2. Power cylinder, 3. Slider, 4. Sealing side plug, 5. Upper seat, 6. Sealing upper plug, 7. Large pipe opening gasket, 8. Pump head base, 9. Pump head body, 10. Cylindrical, 11. Small pipe opening gasket, 12. Circular inner cavity, 13. Circular groove, 14. Step, 15. Parts extraction groove, 16. Channel, 17. Positioning block, 18. Limiting post, 19. Insertion hole, 20. Air inlet hole, 21. Air inlet channel, 22. Interface, 23. Clearance groove, 24. Annular groove, 25. Insertion post, 26. Large pipe opening, 27. Flange, 28. Notch, 29. Side pipe opening, 30. Main chamber, 31. Small pipe opening. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0018] The embodiments of this utility model relate to a test fixture for the airtightness of an automotive electronic water pump head, such as... Figure 1-8 As shown, the device includes a lower seat 1 and an upper seat 5. A pump head base 8 is mounted on the upper end of the lower seat 1. A circular inner cavity 12 is formed at the upper end of the pump head base 8. A step 14 is arranged at the upper opening of the circular inner cavity 12. A channel 16 communicating with the circular inner cavity 12 is formed on the left side of the pump head base 8. A positioning block 17 is embedded in front of the channel 16 at the upper end of the pump head base 8. One end of the positioning block 17 extends onto the step 14. A circular groove 13 is formed in the middle of the bottom surface of the circular inner cavity 12. A ring is embedded in the middle of the circular groove 13. The lower seat 1 has a small-shaped pipe opening sealing gasket 11. The upper end of the lower seat 1 is located on the left side of the pump head base 8 and a slider 3 and a power cylinder 2 that drives the slider 3 to slide laterally are installed. One end of the slider 3 is provided with a sealing side plug 4 that is inserted into the channel 16. The lower end of the upper seat 5 is provided with a sealing upper plug 6 that is inserted into the circular inner cavity 12. A large pipe opening sealing gasket 7 is arranged around the sealing upper plug 6 at the lower end of the upper seat 5. An air inlet hole 20 is opened in the center of the bottom of the large pipe opening sealing gasket 7. The upper end of the air inlet hole 20 is connected to the air inlet channel 21 provided inside the upper seat 5.

[0019] As a preferred embodiment, each of the four corners of the lower end of the upper seat 5 is provided with an insertion hole 19, and a limiting post 18 is inserted into each insertion hole 19. The upper seat 5 and the limiting post 18 are connected and fixed by fasteners. The fasteners are countersunk bolts, which pass through the countersunk bolts from bottom to top and are threaded to the lower end face of the upper seat 5. The limiting post 18 limits the closest distance between the upper seat 5 and the lower seat 1 after mold closing, so as to avoid damaging the product.

[0020] As a preferred embodiment, the upper end of the pump head base 8 has a part removal groove 15 on each of the front and rear sides of the circular inner cavity 12. The part removal groove 15 is a through groove, and the width of the part removal groove 15 is adapted to the insertion of fingers or part removal tools, so as to facilitate the quick removal of the pump head after the test is completed.

[0021] As a preferred option, the power cylinder 2 is a dual-shaft cylinder, which can provide more stable thrust, ensuring that the sealing side plug 4 is inserted into the channel 16 at a uniform speed and smoothly, avoiding poor sealing or damage to the pump head due to uneven thrust.

[0022] As a preferred embodiment, the positioning block 17 has a convex block structure. The larger end of the positioning block 17 is embedded in the pump head base 8, and the smaller end extends to the step 14, which can be engaged with the notch of the pump head edge contour to achieve circumferential positioning of the pump head and prevent the pump head from rotating during the test.

[0023] As a preferred embodiment, a cylinder 10 is provided in the middle of the circular groove 13, and the small tube opening sealing gasket 11 is sleeved on the cylinder 10. The cylinder 10 can play a radial limiting role for the small tube opening sealing gasket 11, preventing the sealing gasket from shifting, and at the same time improving the fitting accuracy between the small tube opening sealing gasket 11 and the pump head small tube opening.

[0024] As a preferred embodiment, the upper seat 5 has an interface 22 connected to the air intake channel 21 on its side. The interface 22 is generally an internal thread interface. The interface 22 can be connected to an external air tightness testing instrument through an air pipe to achieve a stable input of test gas.

[0025] As a preferred embodiment, the bottom of the upper seat 5 is provided with a relief groove 23 around the large pipe opening sealing gasket 7. The relief groove 23 is to avoid interference between the upper seat 5 and the upper contour edge of the pump head when the mold is closed, so as to ensure smooth mold closing.

[0026] As a preferred embodiment, the sealing plug 6 is cylindrical in shape, with an insert post 25 axially arranged on the upper part of the sealing plug 6. The outer diameter of the insert post 25 is smaller than the outer diameter of the sealing plug 6. The upper end of the insert post 25 is inserted into the upper seat 5 and fixed by fasteners. The large-port sealing gasket 7 has a ring structure. A ring groove 24 is arranged at the lower end of the inner hole of the large-port sealing gasket 7. The large-port sealing gasket 7 is fitted over the insert post 25, and the ring groove 24 is engaged with the sealing plug 6 to prevent the large-port sealing gasket 7 from shifting during the testing process.

[0027] As a preferred embodiment, both the large-port sealing gasket 7 and the small-port sealing gasket 11 are made of aging-resistant, high-airtightness nitrile rubber or fluororubber, which can adapt to long-term repeated compression sealing requirements and extend service life; the surfaces of the sealing side plug 4 and the sealing top plug 6 are both provided with wear-resistant coatings to improve wear resistance and sealing effect.

[0028] As a preferred embodiment, the upper end of the lower seat 1 is provided with a groove for the slider 3 to slide laterally. The groove can ensure the straightness of the slider 3 sliding laterally, avoid the displacement of the sealing side plug 4 when it is inserted into the channel 16, and improve the sealing accuracy.

[0029] The working process of this utility model is as follows: The pump head body 9 to be tested is placed in the circular inner cavity 12 of the pump head base 8. The flange 27 at the upper end of the pump head body 9 is supported by the step 14. The pump head body 9 is rotated so that the notch 28 on the flange 27 is engaged with one end of the positioning block 17, thereby achieving precise positioning of the pump head body 9. At the same time, the small tube opening 31 at the bottom of the pump head body 9 is pressed on the small tube opening sealing gasket 11. The press drives the upper seat 5 to move downward, so that the sealing plug 6 is inserted into the main chamber 30. The large tube opening sealing gasket 7 is tightly fitted with the upper end face of the large tube opening 26, thereby sealing the large tube opening 26. At the same time, the sealing plug 6 provides pressure to the pump head body 9. Applying downward pressure ensures that the small tube opening 31 and the small tube opening sealing gasket 11 fit tightly together, thus sealing the small tube opening 31. Activating the power cylinder 2 drives the slider 3 to slide towards the pump head base 8, causing the sealing side plug 4 to be precisely inserted into the channel 16. The sealing side plug 4 fits tightly against the side tube opening 29, achieving a side seal. Connecting the airtightness testing instrument to the interface 22 of the upper base 5 via an external air pipe, activating the testing instrument, and allowing test gas to enter the pump head through the interface 22, air inlet channel 21, and air inlet hole 20, maintaining the set pressure for a period of time, and then detecting pressure changes through the testing instrument to determine whether the pump head's airtightness is qualified.

[0030] After the test is completed, the pressure is first released through the testing instrument, then the upper seat 5 is driven to reset upwards, the power cylinder 2 is started to drive the slider 3 and the sealing side plug 4 to reset, and the operator takes out the pump head through the part removal slot 15 to complete a single test.

[0031] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] The above provides a detailed description of the automotive electronic water pump head airtightness testing fixture provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A test fixture for the airtightness of an automotive electronic water pump head, comprising a lower seat (1) and an upper seat (5), characterized in that: The lower seat (1) is equipped with a pump head base (8) at its upper end. The pump head base (8) has a circular inner cavity (12) at its upper end. A step (14) is arranged at the upper opening of the circular inner cavity (12). A channel (16) connecting the circular inner cavity (12) is opened on the left side of the pump head base (8). A positioning block (17) is embedded in front of the channel (16) at the upper end of the pump head base (8). One end of the positioning block (17) extends to the step (14). A circular groove (13) is opened in the middle of the bottom surface of the circular inner cavity (12). A small annular tube opening sealing gasket (1) is embedded in the middle of the circular groove (13). 1) The upper end of the lower seat (1) is located on the left side of the pump head base (8) and a slider (3) and a power cylinder (2) for driving the slider (3) to slide laterally are installed. One end of the slider (3) is provided with a sealing side plug (4) inserted into the channel (16). The lower end of the upper seat (5) is provided with a sealing upper plug (6) inserted into the circular inner cavity (12). The lower end of the upper seat (5) is surrounded by a ring of large pipe sealing gasket (7). The bottom center of the large pipe sealing gasket (7) is provided with an air inlet hole (20). The upper end of the air inlet hole (20) is connected to the air inlet channel (21) provided inside the upper seat (5).

2. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The upper seat (5) has a socket (19) at each of the four corners at the lower end. A limiting post (18) is inserted into each socket (19). The upper seat (5) and the limiting post (18) are connected and fixed by fasteners.

3. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The pump head base (8) has a part-taking groove (15) on each side of the front and rear sides of the circular inner cavity (12) at the upper end. The part-taking groove (15) is a through groove.

4. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The power cylinder (2) is a twin-shaft cylinder.

5. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The positioning block (17) has a convex-shaped block structure.

6. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: A cylinder (10) is provided in the middle of the circular groove (13), and the small tube opening sealing gasket (11) is sleeved on the outside of the cylinder (10).

7. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The upper seat (5) has an interface (22) connected to an air intake channel (21) on its side.

8. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The bottom of the upper seat (5) is surrounded by a clearance groove (23) around the large pipe opening sealing gasket (7).

9. The automotive electronic water pump head airtightness testing fixture according to claim 1, characterized in that: The sealing plug (6) is cylindrical in shape. An insert (25) is axially arranged on the upper part of the sealing plug (6). The outer diameter of the insert (25) is smaller than the outer diameter of the sealing plug (6). The upper end of the insert (25) is inserted into the upper seat (5) and fixed by fasteners. The large pipe opening sealing gasket (7) is annular in structure. A ring groove (24) is arranged at the lower end of the inner hole of the large pipe opening sealing gasket (7). The large pipe opening sealing gasket (7) is sleeved on the insert (25). The ring groove (24) is engaged with the sealing plug (6).

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