Air tightness detection device
By designing the radial deformation characteristics of the seal in the airtightness detection device, the contact pressure on the product import position is reduced, the wear problem during the detection process is solved, and a gentler detection effect is achieved.
Patent Information
- Application Number
- CN202421054924.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-15
AI Technical Summary
During the airtightness detection process, the seal is directly pressed to the corresponding position of the product import. Long-term working time may lead to wear at the product import position.
Design an airtightness detection device, the sealing surface of the seal is located in its radial inner wall, and the sealing member is slid along the axial direction of the column cylinder through the compression mechanism, causing it to produce radial deformation, thereby facing the side of the product to be tested Sealing is performed to reduce contact pressure to the import position of the product.
It effectively reduces wear at the import position of the product to be tested, and partial pressure is borne by the shell, so that the seal can bear more pressure when it deforms, reducing the risk of wear on the product.
Smart Images
Figure CN222318320U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of air tightness detection, and in particular to an air tightness detection device. Background Art
[0002] For parts with fluid cavities, the products have sealing performance requirements. For parts with holes, air tightness testing is required before the product leaves the factory to ensure the sealing of the product.
[0003] For example, for water pumps, during the production process of the water pumps, the air tightness of the impeller chamber of the water pump is usually tested.
[0004] There is an airtightness testing device that generally includes a tooling body, which is provided with a through hole and an air outlet pipe. The air outlet pipe and the through hole are interconnected, and an O-ring seal is also provided at the air outlet pipe. When performing airtightness testing, the tooling is driven to drive the seal to press the product so that the air outlet pipe is aligned with the product inlet. At the same time, the connection between the air outlet pipe and the product inlet is sealed by the seal, and then air is blown from the through hole to perform airtightness testing on the product.
[0005] With respect to the above-mentioned related technologies, the inventors believe that when performing inspection, the seal is directly pressed to the corresponding position of the product inlet, and the force point is located at the corresponding position of the product inlet. There is a concern that long-term work may cause wear of the corresponding position of the product inlet. Utility Model Content
[0006] Based on this, it is necessary to provide an airtightness detection device and detection method to address the above problems, aiming to reduce the wear on the corresponding position of the product inlet.
[0007] The technical solution adopted in the embodiment of the present application is as follows:
[0008] An airtightness detection device comprises an outer shell and a clamping mechanism, wherein the outer shell comprises a top plate and a column, one end of the column is connected to the top plate, the column is sleeved in the clamping mechanism, the inner wall of the column has a matching portion and an installation portion, the installation portion is relatively far away from the top plate from the matching portion, the clamping mechanism can be axially slidably arranged along the matching portion, the airtightness detection device has a sealing member, part of which is arranged at the installation portion, the sealing member has a sealing surface, the sealing surface is located at the radial inner wall of the sealing member, the sealing surface can be used to abut against a product to be detected, and the sealing member can produce radial deformation.
[0009] By adopting the above technical scheme, the seal has a sealing surface, which is located on the radial inner wall of the seal. When performing detection work, the clamping mechanism slides axially along the cylinder to squeeze the seal, causing the seal to deform radially, so that the sealing surface seals the side of the product to be detected. Compared with the background technology, the setting position of the seal is changed. When the clamping mechanism squeezes the seal, part of the pressure is borne by the outer shell, and part of the pressure is used to deform the seal, thereby reducing the pressure on the product to be detected. At the same time, it also reduces the contact between the seal and the corresponding position of the inlet of the product to be detected, thereby reducing the wear at the corresponding position of the inlet of the product to be detected. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;
[0011] Figure 2 This is a cross-sectional view of the overall structure when the sealing member of one embodiment of the present application is in an annular belt shape;
[0012] Figure 3 for Figure 2 A schematic diagram of the structure of the seal shown;
[0013] Figure 4 This is a cross-sectional view of the overall structure when the sealing member of another embodiment of the present application is in a cover shape;
[0014] Figure 5 For this application Figure 4 A schematic diagram of the structure of the seal shown;
[0015] Figure 6 This is a partial structural schematic diagram of an embodiment of the present application when the driving member is a cylinder;
[0016] Figure 7 This is a partial structural diagram when the driving member in this application is a motor;
[0017] Figure 8 This is a schematic diagram of another matching structure of the protrusion and the sealing member in the present application;
[0018] Explanation of the reference numerals in the accompanying drawings: 1. outer shell; 101. top plate; 102. column; 2. clamping mechanism; 201. pressure plate; 202. pressure cylinder; 3. air pipe; 4. sealing member; 401. top cover; 402. sealing cylinder; 5. driving member; 501. motor; 502. first gear; 503. second gear; 6. groove; 7. through hole; 8. product to be tested; 9. cylinder; 10. pipe fitting; 11. cavity; 12. inflation space; 13. fitting portion; 14. mounting portion; 1401. main body; 1402. raised portion; 15. sealing surface. DETAILED DESCRIPTION
[0019] In order to make the technical means, creative features, objectives and effects achieved by the present application easy to understand, the present application is further explained below in combination with diagrams and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.
[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined; the terms "including" and "having" in the specification and claims and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0021] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.
[0022] The following is combined with Figure 1-Figure 8 This application is described in further detail.
[0023] The embodiment of the present application discloses an airtightness detection device, which can be applied to the airtightness detection of products with sealing performance requirements in the inner cavity of the product, such as the airtightness test of products with holes on the top or side and other parts sealed. As a specific applicable example, the present application can be applied to the airtightness detection of water pump products, and as other specific applicable examples, the present application can also be applied to the airtightness detection of cylindrical structural parts, etc.
[0024] As an implementation method, refer to Figure 1 to Figure 3, an airtightness detection device, comprising a shell 1 and a clamping mechanism 2, the shell 1 comprising a top plate 101 and a column 102, one end of the column 102 is connected to the top plate 101, the column 102 is sleeved on the clamping mechanism 2, the inner wall of the column 102 has a matching portion 13 and a mounting portion 14, the mounting portion 14 is relatively far away from the top plate 101 with respect to the matching portion 13, the clamping mechanism 2 can be axially slidably arranged along the matching portion 13, the airtightness detection device has a sealing member 4, the sealing member 4 is connected to the mounting portion 14, the sealing member 4 has a through hole 7, the sealing member 4 has a sealing surface 15, the sealing member 4 can be deformed along the radial direction of the column 102, and the sealing surface 15 can be used to abut against a product 8 to be detected;
[0025] Furthermore, the air tightness detection device has an air-filled space 12, the air-filled space 12 is located in the inner cavity of the pressing mechanism 2, and the through hole 7 is connected to the air-filled space 12;
[0026] By adopting the above technical solution, the seal 4 has a sealing surface 15, and the sealing surface 15 is located on the radial inner wall of the seal 4. When performing the detection work, the clamping mechanism 2 slides axially along the matching portion 13 to squeeze the seal 4, so that the sealing surface 15 of the seal 4 presses against the product to be detected 8 to cause the seal 4 to deform radially. Compared with the background technology, the matching position between the seal 4 and the product to be detected 8 is changed, thereby reducing the contact between the seal 4 and the corresponding wall portion of the inner cavity opening of the product to be detected 8, thereby reducing the wear on the corresponding wall portion of the inner cavity opening of the product to be detected 8.
[0027] As a specific embodiment, the clamping mechanism 2 includes a pressing plate 201 and a pressing cylinder 202. The pressing plate 201 is axially slidably arranged on the mating portion 13. The pressing cylinder 202 is fixedly arranged on one end of the pressing plate 201 facing the seal 4. The seal 4 is located below the pressing cylinder 202. The pressing cylinder 202 can slide and squeeze the seal 4, causing the seal 4 to undergo radial deformation.
[0028] Furthermore, the inflation space 12 is located in the inner cavity of the pressing cylinder 202, and the air tightness detection device has an air pipe 3, which passes through the clamping mechanism 2, and the inner cavity of the air pipe 3 is connected to the inflation space 12. One end of the air pipe 3 can be used to connect to the first air source. The pressing plate 201 is provided with the air pipe 3, and one end of the air pipe 3 passes through the pressing plate 201 and is connected to the inflation space 12. The other end of the air pipe 3 slides through the top plate 101 and extends out of the outer shell 1. The air pipe 3 is connected to the first air source to facilitate inflation into the inflation space 12.
[0029] As a specific embodiment, the mounting portion 14 has a main body 1401 and a raised portion 1402 for limiting the movement of the sealing member 4. The raised portion 1402 protrudes in the radial direction of the column 102 relative to the main body 1401. At least part of the sealing member 4 is located between the pressing mechanism 2 and the raised portion 1402 in the axial direction of the column 102. The sealing member 4 is supported by the raised portion 1402. The raised portion 1402 is located below the pressing cylinder 202. When the pressing cylinder 202 squeezes the sealing member 4, the raised portion 1402 and the raised portion 1402 are pressed together. Under the dual action of the pressure cylinder 202, the seal 4 undergoes radial deformation, so that the sealing surface 15 of the seal 4 abuts against the outer wall of the product to be inspected 8, and part of the force point of the seal 4 is transferred from the product to be inspected 8 to the raised portion 1402. Compared with the background technology, part of the pressure of the clamping mechanism 2 is transferred to the raised portion 1402, and the other part of the pressure is converted into the pressure of the seal 4 after deformation, thereby reducing the pressure on the product to be inspected 8, and thus reducing the wear of the seal 4 on the product to be inspected 8.
[0030] Furthermore, the seal 4 is in the shape of an annular belt, the radial thickness of the seal 4 is not less than the radial thickness of the pressing cylinder 202, the cross-section of the seal 4 is rectangular, the sealing surface 15 is the inner wall of the seal 4, and the end of the seal 4 facing away from the pressing cylinder 202 is supported on the raised portion 1402, so that the seal 4 is located between the pressing cylinder 202 and the raised portion 1402. The seal 4 with a rectangular cross-section is more likely to undergo radial deformation under the action of pressure, and the radial thickness of the seal 4 is greater than the radial thickness of the pressing cylinder 202, which reduces the probability of the pressing cylinder 202 slipping off the extrusion surface of the seal 4 when extruding the seal 4, and facilitates the pressing cylinder 202 to extrude the seal 4.
[0031] As another embodiment, refer to Figure 4 and Figure 5 The sealing member 4 can also be in the shape of a cover, including a top cover 401 and a sealing cylinder 402. The top cover 401 is axially slidably arranged on the mounting portion 14. One end of the sealing cylinder 402 is fixedly arranged on the side of the top cover 401 away from the pressure cylinder 202. The top cover 401 is located below the pressure cylinder 202. The through hole 7 is opened on the top cover 401. The sealing surface 15 is the inner wall of the sealing cylinder 402. The side of the sealing cylinder 402 away from the top plate 101 is fixed to the raised portion 1402. When the product 8 to be detected has multiple inner cavity openings, one through hole 7 is used instead of multiple inner cavity openings to centrally ventilate the inner cavity of the product 8 to be detected, so as to improve the detection effect.
[0032] As an implementation method, refer to Figure 8 The mounting portion has a groove, the sealing part is partially embedded in the groove, the sealing surface and the side wall of the product to be tested can be interference fit, and the end of the seal 4 away from the clamping mechanism 2 has an inclined guide surface, which reduces the possibility of the seal 4 moving in the mounting portion 14, thereby making the installation of the seal 4 more stable.
[0033] Furthermore, the seal 4 is in the shape of an annular band, the sealing surface 15 is located on the inner wall of the seal 4, the radial thickness of the seal 4 is not less than the radial thickness of the pressing cylinder 202, the cross-section of the seal 4 is rectangular, the radial outer wall of the seal 4 is concave-convex matched with the mounting portion 14, the seal 4 with a rectangular cross-section is more likely to undergo radial deformation under the action of pressure, and the radial thickness of the seal 4 is greater than the radial thickness of the pressing cylinder 202, which reduces the probability of the pressing cylinder 202 slipping off the extrusion surface of the seal 4 when extruding the seal 4, and facilitates the pressing cylinder 202 to extrude the seal 4.
[0034] As another embodiment, the sealing member 4 is cover-shaped, including a top cover 401 and a sealing cylinder 402. The top cover 401 is axially slidably arranged on the mounting portion 14. One end of the sealing cylinder 402 is fixed to the end of the top cover 401 away from the pressing cylinder 202. The top cover 401 is located directly below the pressing cylinder 202. The through hole 7 is opened on the top cover 401 and connected to the inflation space 12. The sealing surface 15 is the inner wall of the sealing cylinder 402. The radial outer wall of the sealing cylinder 402 is concave-convex matched with the mounting portion 14. When the product 8 to be detected has multiple inner cavity openings, one through hole 7 is used instead of multiple inner cavity openings to concentrate ventilation toward the inner cavity of the product 8 to be detected, so as to improve the detection effect.
[0035] As an embodiment, the airtightness detection device has a cavity 11, which is located between the pressure plate 201 and the top plate 101. The airtightness detection device has a pipe fitting 10, which passes through the top plate 101. The inner cavity of the pipe fitting 10 is connected to the cavity 11. One end of the pipe fitting 10 can be used to connect to a second gas source. The second gas source inflates the pipe fitting 10 so that the gas enters the cavity 11, pushing the clamping mechanism 2 to squeeze the seal 4. The second gas source can be the same gas source as the first gas source, and can have different gas paths controlled by solenoid valves, etc., or can be different gas sources, which is convenient for driving the clamping mechanism 2.
[0036] Furthermore, the end of the pipe 10 facing the clamping mechanism 2 does not exceed the end surface of the top plate 101 facing the clamping mechanism 2 , thereby reducing the probability of collision between the clamping mechanism 2 and the pipe 10 .
[0037] As another embodiment, refer to Figure 6 The air tightness detection device has a driving member 5, which can drive the clamping mechanism 2 to slide in the axial direction. The driving member 5 is a cylinder 9 or a motor 501, the body of the driving member 5 is fixed to the top plate 101, and the driving part of the driving member 5 is directly or indirectly connected to the clamping mechanism 2.
[0038] Furthermore, the driving member 5 is a cylinder 9, the cylinder body of the cylinder 9 is fixedly arranged at one end of the top plate 101 away from the clamping mechanism 2, the piston rod of the cylinder 9 passes through the top plate 101 and extends into the cavity 11, and the end of the piston rod of the cylinder 9 is fixedly connected to the end of the pressure plate 201 away from the sealing member 4. The cylinder 9 controls the extension and retraction of the piston rod, thereby driving the pressure plate 201 to move, which is convenient and quick.
[0039] As another embodiment, refer to Figure 7 The structure of the driving member 5 is different, including a motor 501 arranged on the top plate 101, a first gear 502 arranged on the motor 501 and a second gear 503 arranged on the top plate 101. The motor 501 is a servo motor 501. The motor 501 is fixed to the end of the top plate 101 away from the clamping mechanism 2. The first gear 502 is fixedly sleeved on the rotating shaft of the motor 501. The second gear 503 is rotatably connected to the end of the top plate 101 away from the clamping mechanism 2. At the same time, the second gear 503 is threadedly connected to the end of the air pipe 3 extending out of the top plate 101. The first gear 502 and the second gear 503 are meshed with each other. The first gear 502 and the second gear 503 are both bevel gears. The motor 501 drives the first gear 502 to rotate, and the first gear 502 drives the second gear 503 to rotate. The second gear 503 is threadedly connected to the air pipe 3 to drive the pressing plate 201 to move, thereby controlling the movement of the clamping mechanism 2, which is convenient and fast.
[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and controls can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. An airtightness detection device, comprising a housing (1) and a pressing mechanism (2), characterized in that: The housing (1) comprises a top plate (101) and a column (102), one end of the column (102) is connected to the top plate (101), the column (102) is sleeved on the clamping mechanism (2), the inner wall of the column (102) comprises a matching portion (13) and a mounting portion (14), the mounting portion (14) is away from the top plate (101) relative to the matching portion (13), the clamping mechanism (2) can be axially slidably arranged along the matching portion (13), the airtightness detection device comprises a sealing member (4), part of the sealing member (4) is arranged on the mounting portion (14), the sealing member (4) comprises a sealing surface (15), the sealing surface (15) is located on the radial inner wall of the sealing member (4), the sealing surface (15) can be used to abut against the product (8) to be detected, and the sealing member (4) can produce radial deformation.
2. An airtightness detection device according to claim 1, characterized in that: The air-tightness detection device comprises an air-filled space (12), wherein the air-filled space (12) is located in the inner cavity of the clamping mechanism (2), and the air-tightness detection device comprises an air pipe (3), wherein the air pipe (3) passes through the clamping mechanism (2), wherein the inner cavity of the air pipe (3) is connected to the air-filled space (12), and one end of the air pipe (3) can be used to be connected to a first air source.
3. An airtightness detection device according to claim 1 or 2, characterized in that: The mounting portion (14) has a groove, the sealing member (4) is partially embedded in the groove, and the sealing surface (15) can be interference-fitted with the side wall of the product to be tested.
4. An airtightness detection device according to claim 1 or 2, characterized in that: The mounting portion (14) comprises a main body portion (1401) and a protruding portion (1402), wherein the protruding portion (1402) protrudes in the radial direction of the column barrel (102) relative to the main body portion (1401), and at least a portion of the sealing member (4) is located between the clamping mechanism (2) and the protruding portion (1402) in the axial direction of the column barrel (102), and the sealing member (4) is supported by the protruding portion (1402).
5. An airtightness detection device according to claim 1 or 2, characterized in that: The air tightness detection device comprises a cavity (11), wherein the cavity (11) is located between the pressing mechanism (2) and the top plate (101); the air tightness detection device comprises a pipe (10), wherein the pipe (10) passes through the top plate (101); the inner cavity of the pipe (10) is connected to the cavity (11); and one end of the pipe (10) can be used to connect to a second air source.
6. An airtightness detection device according to claim 1 or 2, characterized in that: The air tightness detection device comprises a driving member (5), and the driving member (5) is capable of driving the clamping mechanism (2) to slide along the axial direction of the matching portion. The driving member (5) is a cylinder (9) or a motor (501). The body of the driving member (5) is fixed to the top plate (101), and the driving part of the driving member (5) is connected to the clamping mechanism (2).
7. An airtightness detection device according to claim 1 or 2, characterized in that: The clamping mechanism (2) comprises a pressing plate (201) and a pressing cylinder (202); the pressing plate (201) is axially slidingly matched with the matching portion (13); the pressing cylinder (202) is arranged on the side of the pressing plate (201) facing the sealing member (4); the sealing member (4) is annular; the cross-section of the sealing member (4) is rectangular; the radial thickness of the sealing member (4) is not less than the radial thickness of the pressing cylinder (202); and the sealing surface (15) is the inner wall of the sealing member (4).
8. An airtightness detection device according to claim 1 or 2, characterized in that: The sealing member (4) comprises a top cover (401) and a sealing cylinder (402); the top cover (401) and the sealing cylinder (402) are both located on the mounting portion (14); the top cover (401) is located on the side of the clamping mechanism (2) away from the top plate (101); one end of the sealing cylinder (402) is arranged on the side of the top cover (401) away from the clamping mechanism (2); the top cover (401) has a through hole (7); and the sealing surface (15) is the inner wall of the sealing cylinder (402).
9. The airtightness detection device according to claim 1, characterized in that: The airtightness detection device has an air-filled space (12), and the air-filled space (12) is located in the inner cavity of the clamping mechanism (2). The sealing member (4) has a through hole (7), and the through hole (7) is connected to the air-filled space (12). The airtightness detection device has an air pipe (3), and the air pipe (3) passes through the clamping mechanism (2). The inner cavity of the air pipe (3) is connected to the air-filled space (12). One end of the air pipe (3) can be used to connect to a first air source. The mounting portion (14) has a main body portion (1401) and a protruding portion (1402), and the protruding portion (1402) protrudes in the radial direction of the column (102) relative to the main body portion (1401). The sealing member (4) has a through hole (7), and the through hole (7) is connected to the air-filled space (12). At least part of the sealing member (4) is located between the clamping mechanism (2) and the protrusion (1402) in the axial direction of the column (102), and the sealing member (4) is supported on the protrusion (1402). The clamping mechanism (2) includes a pressing plate (201) and a pressing cylinder (202). The pressing plate (201) is axially slidingly engaged with the mating portion (13). The pressing cylinder (202) is connected to the side of the pressing plate (201) facing the sealing member (4). The sealing member (4) is annular. One end of the sealing member (4) facing away from the clamping mechanism (2) is placed on the protrusion (1402). The pressing cylinder (202) can be squeezed on the side of the sealing member (4) facing away from the protrusion (1402).
10. The airtightness detection device according to claim 1, characterized in that: The airtightness detection device comprises an air-filled space (12), the air-filled space (12) is located in the inner cavity of the pressing mechanism (2), the sealing member (4) comprises a through hole (7), the through hole (7) is connected to the air-filled space (12), the airtightness detection device comprises an air pipe (3), the air pipe (3) passes through the pressing mechanism (2), the inner cavity of the air pipe (3) is connected to the air-filled space (12), and one end of the air pipe (3) can be used to communicate with a first air source The mounting portion (14) comprises a main body (1401) and a protruding portion (1402), wherein the protruding portion (1402) protrudes in the radial direction of the column barrel (102) relative to the main body (1401), and at least a portion of the sealing member (4) is located between the pressing mechanism (2) and the protruding portion (1402) in the axial direction of the column barrel (102), and the sealing member (4) is supported by the protruding portion (1402), and the pressing mechanism (2) comprises a pressing plate (201) and a pressing cylinder (202), the pressing plate (201) is axially slidingly matched with the matching portion (13), the pressing cylinder (202) is connected to the side of the pressing plate (201) facing the sealing member (4), the sealing member (4) comprises a top cover (401) and a sealing cylinder (402), the top cover (401) and the sealing cylinder (402) are both located on the mounting portion (14), the top cover (401) is located on the pressing mechanism ( 2), one end of the sealing cylinder (402) is arranged on the side of the top cover (401) away from the clamping mechanism (2), the through hole (7) is located on the top cover (401), the sealing surface (15) (13) is the inner wall of the sealing cylinder (402), one end of the sealing cylinder (402) away from the top cover (401) is supported on the protrusion (1402), and the pressing cylinder (202) can squeeze the top cover (401) toward the side of the clamping mechanism (2).