Air pressure sealing performance test device for cavity part

Abstract

The invention provides an air pressure sealing test device for a cavity part, which comprises a base plate, an elastic rubber plate and a locking plate, the base plate is fixedly connected to one side of the elastic rubber plate, the locking plate is fixedly connected to the other side of the elastic rubber plate, the locking plate is used for fixing a pressure test workpiece on the outer side of the elastic rubber plate, and an air cavity is enclosed between the base plate and the elastic rubber plate. An air inlet connector communicated with the air cavity is connected to the base plate, and a through hole is formed in the elastic rubber plate. The pressure test device has the beneficial effects that when the pressure test workpiece is fixed on the outer side of the elastic rubber plate through the locking plate for test, the air cavity is inflated through the air inlet interface, so that the elastic rubber plate bulges towards the pressure test workpiece side, the characteristic that the spherical air bag and the port of the pressure test workpiece form linear sealing is formed, and the purpose of safety and reliability in the pressure test process is achieved; the air flow enters the pressure test workpiece through the through hole to carry out a pressure test; the device is suitable for pressure test workpieces of different sizes and specifications, and can effectively improve the operation convenience, safety and reliability of an air pressure sealing test.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing detection of cavity parts, and in particular relates to an air pressure sealing test device for cavity parts. Background Art

[0002] The air pressure sealing test is a test to detect whether the cavity parts have good sealing under the specified working pressure. This test is usually used to evaluate and detect the quality, reliability and safety of parts to ensure that there will be no leakage, rupture and other problems in the actual use environment.

[0003] In daily production, facing the components to be pressure tested with different specifications and various types of joints, a large number of sealing test devices need to be designed and manufactured. This method is seriously unsuitable for small-batch and multi-variety production. Especially for parts with a short R&D cycle, the air pressure sealing test can only be carried out by temporary emergency methods such as rubber plugging or plugging. This method is cumbersome to operate and it is not easy to find potential problems in the parts, and it will cause safety hazards to the pressure test personnel.

[0004] Most of the air pressure sealing test devices for daily produced parts use flat seals or plug-in seals. Although the structural design is simple, it requires high processing accuracy, a long production cycle, a single service product, and high requirements for the installation position and clamping torque of the workpiece and the sealing device. Therefore, the sealing test in operation is labor-intensive, time-consuming and labor-intensive, cumbersome to operate, difficult to clamp, and low work efficiency.

[0005] Planar seal is a hard seal that uses friction and pressure on the sealing interface. To ensure the sealing effect of the plane seal, first of all, the surface finish and flatness of the two planes must be good enough, and the pressure between the planes must be adjusted by adjusting the torque of the clamping nut. In actual operation, if there are defects such as deformation, bumps, grooves or through-scratches on the contact surface of the workpiece, it will cause uneven distribution of contact torque under the clamping state, resulting in seal failure; if there is a deviation in the clamping position of the parts and the test device or the specified torque requirement is not met during clamping, this will cause the surfaces to not fit completely and cause unilateral leakage, especially when the workpiece with an unprocessed blank joint is tested for sealing, the plane sealing effect is even worse and may even lead to seal failure.

[0006] Insertion seals are essentially elastomeric seals, which mainly insert the sealing test device into the interface of the workpiece to be pressure tested to form a seal. Viscoelastic materials such as "O" rings and rubber rods are usually used as the main sealing materials. In order to ensure the reliability of the insert seal, the design and processing of the sealing groove become particularly important, otherwise the "O" ring seal may fail. Under high test pressure conditions, the "O" ring may be squeezed into the sealing gap and cause gap bite. Especially when conducting sealing tests on workpieces with poor inner wall finish, the sealing material will be significantly kneaded and twisted during the insertion of the sealing device, resulting in a significant shortening of the service life of the sealing device. When the deformation exceeds the elastic modulus of the sealing material itself, the sealing effect will be lost.

[0007] Therefore, in order to improve the reliability and convenience of the air pressure sealing of components and the safety of operators, it is of great significance to study a flexible air pressure sealing test device for different specifications and joints. Summary of the invention

[0008] In view of this, the present invention aims to overcome the deficiencies of the above-mentioned problems in the prior art and proposes a gas pressure sealing test device for cavity parts.

[0009] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0010] A pneumatic sealing test device for cavity parts comprises a base plate, an elastic rubber plate and a locking plate. The base plate is fixed to one side of the elastic rubber plate, and the locking plate is fixed to the other side of the elastic rubber plate. The locking plate is used to fix the pressure test workpiece on the outer side of the elastic rubber plate. An air cavity is enclosed between the base plate and the elastic rubber plate, and an air inlet interface connected to the air cavity is connected to the base plate, and a through hole is opened on the elastic rubber plate.

[0011] Furthermore, a groove is provided on one side of the substrate facing the elastic rubber plate, an air cavity is formed between the elastic rubber plate and the inner wall of the groove, an air intake spoiler seat is fixedly connected to the groove at the position corresponding to the air intake interface, the air intake spoiler seat is an integrally formed structure and includes a mounting portion and a spoiler portion arranged toward the groove, a mounting groove is horizontally provided in the mounting portion, an air collecting groove connected to the mounting groove and a plurality of air guide grooves evenly arranged along the circumference of the air collecting groove and connected to the air collecting groove are provided in the spoiler portion, an open end of the air guide groove extends to the surface of the spoiler portion, the mounting portion is screwed on the substrate, and the end of the air intake interface is screwed in the mounting groove.

[0012] Furthermore, the spoiler portion and the mounting portion are coaxially arranged, and the circumferential outer side wall of the spoiler portion is arranged as a sound cone curved surface structure, the inner wall of the groove is arranged as a smooth arc surface structure, the bottom end of the sound cone curved surface abuts against the bottom of the groove, and the sound cone curved surface is arranged in a smooth transition at the contact point between the bottom edge and the bottom of the groove.

[0013] Furthermore, the size of the through hole is smaller than the inner diameter of the air inlet interface.

[0014] Furthermore, the substrate is provided with a plurality of first fixing grooves evenly arranged along the circumferential outer side of the groove, the elastic rubber plate is provided with first through holes corresponding to the first fixing grooves, an annular pressure plate is provided on the side of the elastic rubber plate away from the substrate, a first connecting hole is provided on the annular pressure plate corresponding to each first through hole, and the annular pressure plate is fixed to one side of the substrate by bolts in cooperation with the first connecting hole, the first through hole and the first fixing groove.

[0015] Furthermore, the end surface of the substrate at the opening of the groove protrudes outward and is arranged to be a curved surface structure with an arc-shaped cross-section, and an annular sealing convex edge is provided on the curved surface of the substrate along the circumference of the groove. The side of the annular pressure plate facing the elastic rubber plate is recessed inward and arranged to be an annular arc surface matching the curved surface of the substrate, and the junction between the annular arc surface and the inner wall of the annular pressure plate is arranged to be an annular chamfered structure. The elastic rubber plate is squeezed and pressed against the annular arc surface of the annular pressure plate and the curved surface of the substrate, and is sealed by the sealing convex edge.

[0016] Furthermore, the base plate is provided with a plurality of second fixing grooves evenly arranged along the circumferential outer side of the groove, the elastic rubber plate is provided with second through holes corresponding to the second fixing grooves, the locking plate is provided with a U-shaped through groove, the locking plate is provided with second connecting holes corresponding to the second through holes, and the annular pressure plate is provided with third through holes corresponding to each second connecting hole, the locking plate is fixedly connected to the outer side of the elastic rubber plate by cooperating with the second connecting hole, the third through hole, the second through hole and the second fixing groove through an adjusting nut and a positioning pin, and a spacing ring located between the locking plate and the annular pressure plate is sleeved on each positioning pin.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) The air pressure sealing test device for cavity parts of the present invention fixes the pressure test workpiece on the outer side of the elastic rubber plate through the locking plate for testing, and inflates the air cavity through the air inlet interface to make the elastic rubber plate bulge toward the pressure test workpiece, forming a spherical airbag and the port of the pressure test workpiece to form a linear seal, thereby achieving the purpose of a safe and reliable pressure test process, and the airflow enters the pressure test workpiece through the through hole for pressure testing; the device is suitable for pressure test workpieces of different sizes and specifications, meets the air pressure test requirements of different workpieces, and can effectively improve the operational convenience and safety and reliability of the air pressure sealing test;

[0019] (2) The air pressure sealing test device for cavity parts described in the present invention is provided with an air intake spoiler seat fixed to a substrate in the air cavity, and the surface of the exhaust side of the spoiler is provided with a cone curved surface structure, and is smoothly transitioned with the bottom of the groove to ensure that the angle of the airflow ejected from the air intake spoiler is tangent to the initial contact point of the air cavity, thereby effectively reducing the airflow movement resistance and extending the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the air pressure sealing test device for cavity parts according to an embodiment of the present invention installed on a pressure test workpiece;

[0022] Figure 2 A cross-sectional view of a substrate structure according to an embodiment of the present invention;

[0023] Figure 3 A cross-sectional view of the air intake spoiler structure according to an embodiment of the present invention;

[0024] Figure 4 A cross-sectional view of the locking plate structure according to an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of the locking plate structure described in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Base plate; 101. Groove; 102. Mounting hole; 103. Curved surface; 104. Sealing convex edge; 2. Elastic rubber plate; 201. Through hole; 3. Annular pressure plate; 301. Annular arc surface; 4. Locking plate; 401. U-shaped through groove; 5. Air intake interface; 6. Air intake spoiler seat; 601. Mounting part; 602. Spoiler part; 603. Mounting groove; 604. Air collecting groove; 605. Air guide groove; 606. Sound cone curved surface; 7. Rubber sealing ring; 8. Positioning pin; 9. Adjusting nut; 10. Spacer ring; 11. Pressure test workpiece; 12. Air cavity. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] As shown in the figure, a pneumatic sealing test device for cavity parts includes a substrate 1, an elastic rubber plate 2 and a locking plate 4. The substrate 1 is fixed to one side of the elastic rubber plate 2, and the locking plate 4 is fixed to the other side of the elastic rubber plate 2. The locking plate 4 is used to fix the pressure test workpiece 11 on the outer side of the elastic rubber plate 2. An air cavity 12 is surrounded by the substrate 1 and the elastic rubber plate 2, and an air inlet interface 5 connected to the air cavity 12 is connected to the substrate 1, and a through hole 201 is opened on the elastic rubber plate 2 corresponding to the cavity opening of the pressure test workpiece 11. In this embodiment, when the pressure test workpiece 11 is fixed on the outer side of the elastic rubber plate 2 by the locking plate 4 for testing, air is inflated into the air cavity 12 through the air inlet interface 5 to make the elastic rubber plate 2 bulge toward the side of the pressure test workpiece 11, forming a spherical airbag and a linear seal with the port of the pressure test workpiece 11, thereby achieving the purpose of a safe and reliable pressure test process, and the air flow enters the pressure test workpiece 11 through the through hole 201 for pressure testing; the device is suitable for pressure test workpieces 11 of different sizes and specifications, meets the air pressure testing requirements of different workpieces, and can greatly improve the operational convenience and safety and reliability of the air pressure sealing test.

[0033] A groove 101 is provided on one side of the substrate 1 facing the elastic rubber plate 2, and an air cavity 12 is formed between the elastic rubber plate 2 and the inner wall of the groove 101. An air intake spoiler seat 6 is fixedly connected to the groove 101 at the position corresponding to the air intake interface 5. The air intake spoiler seat 6 is an integrally formed structure and includes a mounting portion 601 and a spoiler portion 602 arranged toward the groove 101. A mounting groove 603 is horizontally provided in the mounting portion 601, and an air collecting groove 604 connected to the mounting groove 603 and a plurality of air guide grooves 605 uniformly arranged along the circumference of the air collecting groove 604 and connected to the air collecting groove 604 are provided in the spoiler portion 602. The open ends of the air guide grooves 605 extend to the surface of the spoiler portion 602. The mounting portion 601 is screwed on the substrate 1, and the end of the air intake interface 5 is screwed in the mounting groove 603. In this embodiment, a mounting hole 102 connected to the groove 101 is provided at the middle of the bottom of the corresponding groove 101 on the substrate 1, and the mounting portion 601 is screwed into the mounting hole 102; a rubber sealing ring 7 is provided between the limit edge of the circumferential surface of the air inlet interface 5 near the mounting portion 601 and the outer end surface of the mounting portion 601 to improve the installation sealing of the air inlet interface 5. The air flows into the air cavity 12 through the air inlet interface 5 through the air collecting groove 604 and the air guide groove 605, so that the air pressure in the air cavity 12 increases, and the elastic rubber plate 2 bulges outward and deforms, so that the outer side of the elastic rubber plate 2 is pressed against the cavity opening of the pressure test workpiece 11, and at the same time, the air flows into the cavity of the pressure test workpiece 11 through the through hole 201 to perform the air pressure sealing test.

[0034] The spoiler 602 and the mounting portion 601 are coaxially arranged, and the circumferential outer side wall of the spoiler 602 is arranged as a sound cone curved surface 606 structure, and the inner wall of the groove 101 is arranged as a smooth arc surface structure, and the bottom end of the sound cone curved surface 606 abuts against the bottom of the groove 101, and the sound cone curved surface 606 is arranged in a smooth transition at the contact point between the bottom edge and the bottom of the groove 101, ensuring that the angle of the airflow ejected from the air intake spoiler seat 6 is tangent to the initial contact point of the air cavity 12, effectively reducing the airflow movement resistance. In this embodiment, if Figure 1 As shown, Figure 1 The direction of the middle arrow is the direction of airflow movement. The inner wall of the groove 101 cooperates with the sound cone curved surface 606 to effectively reduce the airflow movement resistance and extend the service life of the device.

[0035] The size of the through hole 201 is smaller than the inner diameter of the air intake interface 5, ensuring that during the air intake process, the elastic rubber plate 2 can swell due to the pressure difference generated on both sides under the action of the surrounding impact of the airflow.

[0036] The substrate 1 is provided with a plurality of first fixing grooves uniformly arranged along the circumferential outer side of the groove 101, and the elastic rubber plate 2 is provided with first through holes corresponding to the first fixing grooves. An annular pressure plate 3 is provided on the side of the elastic rubber plate 2 away from the substrate 1, and a first connecting hole is provided on the annular pressure plate 3 corresponding to each first through hole. The annular pressure plate 3 is matched with the first connecting hole, the first through hole and the first fixing groove by bolts to fix the elastic rubber plate 2 to one side of the substrate 1.

[0037] The end surface of the substrate 1 located at the opening of the groove 101 is protruded outwardly and is set to a curved surface 103 structure with an arc-shaped cross-section. In this embodiment, the end surface of the substrate 1 located at the opening of the groove 101 is protruded outwardly and is set to a spherical structure, and an annular sealing convex edge 104 is provided on the surface of the curved surface 103 of the substrate 1 along the circumference of the groove 101. The side of the annular pressure plate 3 facing the elastic rubber plate 2 is recessed inwardly and is set to an annular arc surface 301 that matches the curved surface 103 of the substrate 1, and the junction between the annular arc surface 301 and the inner wall of the annular pressure plate 3 is set to an annular chamfered structure. The elastic rubber plate 2 is squeezed and pressed against the curved surface 103 of the substrate 1 by the annular arc surface 301 of the annular pressure plate 3, and is sealed by the sealing convex edge 104, thereby enhancing the sealing between the elastic rubber plate 2 and the substrate 1.

[0038] The base plate 1 is provided with a plurality of second fixing grooves evenly arranged along the outer side of the groove 101, the elastic rubber plate 2 is provided with second through holes corresponding to the second fixing grooves, the locking plate 4 is provided with a U-shaped through groove 401, the locking plate 4 is provided with a second connection hole corresponding to the second through hole, the annular pressure plate 3 is provided with a third through hole corresponding to each second connection hole, the locking plate 4 is fixedly connected to the outer side of the elastic rubber plate 2 by adjusting the nut 9 and the positioning pin 8 in cooperation with the second connection hole, the third through hole, the second through hole, and the second fixing groove, and a spacing ring 10 located between the locking plate 4 and the annular pressure plate 3 is sleeved on each positioning pin 8. In this embodiment, the U-shaped through groove 401 is provided with a chamfered structure at one side edge facing the elastic rubber plate 2 to increase the connection reliability of the test pressure workpiece 11 and avoid damage to the test pressure workpiece 11. When in use, the locking plate 4 is sleeved on the test pressure workpiece 11 through the U-shaped through groove 401, a suitable spacing ring 10 is selected to be sleeved on the positioning pin 8, and the locking plate 4 is installed on the outside of the annular pressure plate 3 through the positioning pin 8, and then the adjusting nut 9 is tightened to ensure that the test pressure workpiece 11 is firmly installed in the locking plate 4.

[0039] In this embodiment, the elastic rubber plate 2 is made of silicone.

[0040] The working process of this embodiment is as follows:

[0041] The locking plate 4 is sleeved on the pressure test workpiece 11 through the U-shaped through groove 401, and a suitable spacing ring 10 is selected to be sleeved on the positioning pin 8, and the locking plate 4 is installed on the outer side of the annular pressure plate 3 through the positioning pin 8, and then the adjusting nut 9 is tightened to make the locking plate 4 clamp the limit edge at the port of the pressure test workpiece 11, so that the pressure test workpiece 11 is firmly installed in the locking plate 4, and the pressure test workpiece 11 is fixed to the outer side of the elastic rubber plate 2 through the locking plate 4, and the air is inflated into the air cavity 12 through the air inlet interface 5 to make the elastic rubber plate 2 bulge toward the side of the pressure test workpiece 11 to form a spherical air bag, and then a linear seal is formed with the port of the pressure test workpiece 11, so as to achieve the purpose of safe and reliable pressure test process, and the air flow enters the pressure test workpiece 11 through the through hole 201 for pressure test; the device is suitable for pressure test workpieces 11 of different sizes and specifications, meets the air pressure test requirements of different workpieces, and can greatly improve the operational convenience and safety and reliability of air pressure sealing test.

[0042] During the air pressure test, the staff only needs to complete the above-mentioned cyclic operation of "inserting the pressure test workpiece 11 into the locking plate 4, ventilating and pressure testing, exhausting and relieving the pressure, and removing the workpiece" to accurately complete the air pressure sealing test of the workpiece, which reduces the dependence of daily air pressure sealing tests on the skill level of the staff, greatly improves the safety and reliability of air pressure sealing tests on components, enhances the convenience and effectiveness of air pressure sealing tests, and avoids the occurrence of quality problems such as false detection and misdetection of sealing tests due to improper operation.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas pressure sealing test device for cavity parts, characterized in that: It includes a base plate, an elastic rubber plate and a locking plate. The base plate is fixed to one side of the elastic rubber plate, and the locking plate is fixed to the other side of the elastic rubber plate. The locking plate is used to fix the pressure test workpiece on the outer side of the elastic rubber plate. An air cavity is surrounded by the base plate and the elastic rubber plate, and an air inlet interface connected to the air cavity is connected to the base plate, and a through hole is opened on the elastic rubber plate.

2. The air pressure sealing test device for cavity parts according to claim 1, characterized in that: A groove is provided on one side of the substrate facing the elastic rubber plate, an air cavity is formed between the elastic rubber plate and the inner wall of the groove, an air intake spoiler seat is fixedly connected to the groove at the position corresponding to the air intake interface, the air intake spoiler seat is an integrally formed structure and includes a mounting portion and a spoiler portion arranged toward the groove, a mounting groove is horizontally provided in the mounting portion, an air collecting groove connected to the mounting groove and a plurality of air guide grooves uniformly arranged along the circumference of the air collecting groove and connected to the air collecting groove are provided in the spoiler portion, an open end of the air guide groove extends to the surface of the spoiler portion, the mounting portion is screwed on the substrate, and the end of the air intake interface is screwed in the mounting groove.

3. The air pressure sealing test device for cavity parts according to claim 2, characterized in that: The spoiler and the mounting portion are coaxially arranged, and the circumferential outer side wall of the spoiler is arranged as a sound cone curved surface structure, the inner wall of the groove is arranged as a smooth arc surface structure, the bottom end of the sound cone curved surface abuts against the bottom of the groove, and the sound cone curved surface is arranged in a smooth transition at the contact point between the bottom edge and the bottom of the groove.

4. The air pressure sealing test device for cavity parts according to claim 1, characterized in that: The size of the through hole is smaller than the inner diameter of the air inlet interface.

5. The air pressure sealing test device for cavity parts according to claim 1, characterized in that: The base plate is provided with a plurality of first fixing grooves evenly arranged along the circumferential outer side of the groove, the elastic rubber plate is provided with first through holes corresponding to the first fixing grooves, an annular pressure plate is provided on the side of the elastic rubber plate away from the base plate, a first connecting hole is provided on the annular pressure plate corresponding to each first through hole, and the annular pressure plate is matched with the first connecting hole, the first through hole and the first fixing groove by bolts to fix the elastic rubber plate to one side of the base plate.

6. The air pressure sealing test device for cavity parts according to claim 5, characterized in that: The end surface of the substrate at the opening of the groove protrudes outward and is set to a curved surface structure with an arc-shaped cross-section, and an annular sealing convex edge is provided on the curved surface of the substrate along the circumference of the groove. The side of the annular pressure plate facing the elastic rubber plate is recessed inward and is set to an annular arc surface that matches the curved surface of the substrate, and the junction between the annular arc surface and the inner wall of the annular pressure plate is set to an annular chamfered structure. The elastic rubber plate is squeezed and pressed against the curved surface of the substrate by the annular arc surface of the annular pressure plate and the substrate, and is sealed by the sealing convex edge.

7. The air pressure sealing test device for cavity parts according to claim 5, characterized in that: The base plate is provided with a plurality of second fixing grooves evenly arranged along the circumferential outer side of the groove, the elastic rubber plate is provided with second through holes corresponding to the second fixing grooves, the locking plate is provided with a U-shaped through groove, the locking plate is provided with second connecting holes corresponding to the second through holes, and the annular pressure plate is provided with third through holes corresponding to each second connecting hole, the locking plate is fixedly connected to the outer side of the elastic rubber plate by cooperating with the second connecting hole, the third through hole, the second through hole and the second fixing groove through an adjusting nut and a locating pin, and a spacing ring located between the locking plate and the annular pressure plate is sleeved on each locating pin.

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