An adjustable airtightness pressure testing device

Abstract

This utility model discloses an adjustable airtightness pressure testing device, including a frame, a workpiece mounting base, a cover plate, and a cylinder. The workpiece mounting base is fixedly installed on the frame and is used to mount the workpiece. The upper end of the workpiece has a top opening. The cover plate is located directly above the workpiece and opposite the top opening, and the cover plate can seal the top opening. A slide rod is integrally connected to the upper part of the cover plate. The cylinder is fixedly installed on the frame and can drive the slide rod to adjust its height. An air guide chamber is opened inside the slide rod, which extends to the bottom of the cover plate and can communicate with the top opening. An interface and an external interface are opened on the outside of the slide rod. The external interface is used to connect to an external pressure air source. It also includes an adjusting cylinder, which has an interface two. Interface two is connected to interface one through an air guide pipe, and the pressure in the inner cavity of the adjusting cylinder can be adjusted. This utility model can conveniently and reliably test the airtightness of workpieces.

Description

Technical Field

[0001] This utility model relates to testing equipment, and more specifically, to an adjustable airtightness pressure testing device. Background Technology

[0002] For some cavity-shaped workpieces, airtightness is a crucial quality indicator. It must meet sealing requirements to prevent leaks that could affect the quality of the entire assembled product. For example, some workpieces are cast and may appear intact, but may contain sand holes or other defects that could cause air leakage.

[0003] There are generally two methods for testing the airtightness of a workpiece. The first is the immersion method, which involves sealing the opening of the workpiece, immersing it in water, and observing the bubbling in the water to determine its airtightness. The second is the pressure testing method, which involves sealing the opening of the workpiece, introducing high-pressure gas into the workpiece, maintaining this pressure for a period of time, and detecting the change in air pressure inside the workpiece using a pressure sensor. If the decrease in air pressure is small, it indicates that the airtightness of the workpiece is good. If the decrease in air pressure is large and exceeds the preset operating value, it indicates that the airtightness of the workpiece does not meet the requirements.

[0004] In the second pressure testing method, for some workpieces with high testing requirements, there is a standard initial testing pressure. The external pressure system also generates an actual pressure value, but this actual pressure value will differ from the standard initial testing pressure, making pressure fine-tuning impossible and failing to meet the standard testing requirements. Moreover, the initial testing pressure required for different workpieces will also vary, and current testing devices cannot meet the pressure regulation requirements.

[0005] Therefore, a new solution is needed to address this problem. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adjustable airtightness pressure testing device.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: an adjustable airtightness pressure testing device, comprising a frame, a workpiece mounting base, a cover plate, and a cylinder. The workpiece mounting base is fixedly installed on the frame and is used to mount the workpiece. The upper end of the workpiece has a top opening. The cover plate is located directly above the workpiece and opposite to the top opening, and the cover plate can seal the top opening. A slide rod is integrally connected to the upper part of the cover plate. The cylinder is fixedly installed on the frame and can drive the slide rod to adjust its height. An air guide cavity is opened inside the slide rod, which extends to the bottom of the cover plate and can communicate with the top opening. An interface and an external interface are opened on the outside of the slide rod, and the external interface is used to connect to an external pressure air source. It also includes an adjusting cylinder, which has an interface two. The interface two is connected to the interface one through an air guide pipe, and the pressure in the inner cavity of the adjusting cylinder can be adjusted.

[0008] The present invention is further configured such that the frame includes a bottom plate and a top plate, the top plate and the bottom plate are arranged opposite each other, the workpiece mounting seat is fixedly installed on the upper side of the bottom plate, and the cylinder is fixedly installed on the top plate;

[0009] The present invention is further configured such that the cylinder has a downwardly positioned telescopic end, which is integrally and fixedly connected to the slide rod.

[0010] The present invention is further configured such that the adjusting cylinder has a cylindrical structure, and a piston is installed inside the adjusting cylinder, and the piston is driven by the extension and retraction of a cylinder.

[0011] The present invention is further configured such that a second sliding rod is fixedly connected to the upper end of the piston, and the second sliding rod is integrally fixedly connected to the telescopic end of the second cylinder.

[0012] The present invention is further configured such that a base is fixedly installed at the bottom of the adjusting cylinder, and an adjusting rod is installed through the base. The adjusting rod includes a sealing slide section, which is slidably and sealingly connected to the base. A limit block is fixedly connected to the upper end of the sealing slide section.

[0013] The present invention is further configured such that the limiting block is located on the lower side of the piston, and the limiting block can press against and block the piston.

[0014] The present invention is further configured such that a sliding seal is installed at the position where the sealing slide rod section passes through the base.

[0015] The present invention is further configured such that the second interface is located on the lower outer periphery of the adjusting cylinder.

[0016] The present invention is further configured such that the adjusting rod also includes a threaded section, the threaded section being integrally fixedly connected to the lower end of the sealing slide section, and the threaded section being coaxially arranged with the sealing slide section;

[0017] The present invention is further configured such that the lower part of the sealing slide section is threadedly connected to the frame.

[0018] The present invention is further configured such that the base is fixedly connected to the frame.

[0019] In summary, this utility model has the following beneficial effects:

[0020] By setting up an adjusting cylinder, which is interconnected with the air guide chamber and the workpiece cavity, the pressure within the adjusting cylinder can be adjusted. During the testing process, by adjusting the pressure within the adjusting cylinder, the pressure within the slide rod and the workpiece cavity can be adjusted, thus regulating the pre-charged pressure value within the workpiece. Using the adjusting cylinder and its internal piston and other components, the initial pressure within the workpiece cavity can be additionally increased. When setting the pressure of the external air source, the pressure can be appropriately lower than the initial pressure required for workpiece testing. After mounting and sealing the top of the workpiece, the workpiece cavity is first pressurized using the external air source, and then the pressure is appropriately increased by adjusting the cylinder pressure to ensure that the increased pressure value within the workpiece cavity matches the required initial pressure value. Attached Figure Description

[0021] Figure 1 This is a perspective view of an adjustable airtightness pressure testing device in this embodiment;

[0022] Figure 2 This is a cross-sectional view of an adjustable airtightness pressure testing device in this embodiment;

[0023] Figure 3 This is a schematic diagram of the external interface and external piping in this embodiment.

[0024] Reference numerals: Frame 1; Base plate 101; Top plate 102; Workpiece mounting seat 2; Workpiece 3; Top opening 31; Cover plate 4; Slide rod 1 41; Air guide chamber 42; Interface 1 421; External interface 422; Cylinder 1 5; Adjusting cylinder body 6; Base 61; Seal 62; Interface 2 63; Cylinder 2 7; Slide rod 2 71; Piston 72; Adjusting rod 8; Sealed slide rod section 81; Threaded section 82; Limiting block 83; Air guide pipe 9; External air source 100; External pipeline 200; Shut-off valve 300; Pressure sensor 400. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This embodiment discloses an adjustable airtightness pressure testing device, referring to... Figure 1 , Figure 2 As shown, this device can be used to test the airtightness of a workpiece.

[0027] In this embodiment, the adjustable airtightness pressure testing device includes a frame 1, a workpiece mounting base 2, a cover plate 4, and a cylinder 5. The frame 1 serves as a support, and the frame 1 includes a base plate 101 and a top plate 102. The top plate 102 and the base plate 101 are arranged vertically opposite each other, which can support and install each component.

[0028] The workpiece mounting base 2 is fixedly installed on the upper side of the base plate 101, and the shape of the workpiece mounting base 2 is adapted to the structure of the workpiece 3. When the workpiece 3 is installed, the lower part of the workpiece 3 can be embedded in the workpiece mounting base 2 to maintain a relatively stable support state.

[0029] The workpiece 3 is hollow inside, and a top opening 31 is provided at the upper end of the workpiece 3. The cover plate 4 is located directly above the workpiece 3 and is opposite to the top opening 31. The top opening 31 can be sealed closed by the cover plate 4. After the cover plate 4 is lowered, the workpiece 3 can be pressed tightly, and the workpiece can be sealed closed by the lower side of the cover plate 4.

[0030] Cylinder 5 is fixedly mounted on the frame 1, and a telescopic end is formed at the lower part of cylinder 5. A slide rod 41 is integrally connected to the upper part of the cover plate 4, and the slide rod 41 is integrally connected and fixed to the telescopic end of cylinder 5. By extending and retracting cylinder 5, the slide rod 41 and the cover plate 4 can be moved up and down to adapt to the opening and closing state of the top opening 31.

[0031] Reference Figure 2 As shown, an air guide cavity 42 is opened inside the slide rod 41, extending to the bottom of the cover plate 4, forming an opening at the bottom of the cover plate 4. After the cover plate 4 seals and closes the top opening 31, the air guide cavity 42 will communicate with the inner cavity of the workpiece 3.

[0032] An external interface 422 is provided on the outside of the slide bar 41. The external interface 422 is connected to an external pressure air source through an air pipe, which can pressurize the inner cavity of the workpiece 3 during the test, so that the workpiece 3 can be in a high-pressure environment inside, and the airtightness of the workpiece 3 can be tested.

[0033] Reference Figure 3 As shown, an external air source 100 and an external interface 422 are connected by an external pipeline 200. A shut-off valve 300 is installed on the external pipeline 200 near the external interface 422. A pressure sensor 400 is installed on the external pipeline 200 at a position corresponding to the external interface 422 and the shut-off valve 300. The airtightness of cylinder 5 can be detected by the pressure change of the pressure sensor 400.

[0034] During the testing process, the cover plate 4 is pressed down by the slide rod 41, which can close the top opening 31 on the upper side of the workpiece 3. Then, the shut-off valve 300 is opened, and the external air source 100 fills the inner cavity of the workpiece 3 with pressurized gas through the external pipeline 200. Then, the shut-off valve 300 is closed, and the inner cavity of the workpiece 3 will be maintained at a relatively high pressure. The pressure state of the inner cavity of the workpiece 3 is detected by the air pressure sensor 400. If the pressure sensor 400 detects that the pressure change in the inner cavity of the workpiece 3 is within the pre-approval range after a certain period of time, the workpiece 3 meets the airtightness requirements. If the air pressure sensor 400 detects that the pressure drop in the inner cavity of the workpiece 3 is too large, the workpiece does not meet the airtightness requirements.

[0035] Furthermore, in this embodiment, the adjustable airtightness pressure testing device has an interface 421 on the outside of the slide bar 41; additionally, an adjusting cylinder 6 is fixedly installed in the frame 1, and the adjusting cylinder 6 has an interface 63. The interface 63 and the interface 421 are connected by an air guide pipe 9, and the pressure inside the adjusting cylinder 6 can be adjusted. During the testing process, the adjusting cylinder 6 is interconnected with the slide bar 41. By adjusting the pressure inside the adjusting cylinder 6, the pressure inside the slide bar 41 and the workpiece 3 can be adjusted, thereby adjusting the pre-filled pressure value inside the workpiece 3.

[0036] In this embodiment, the regulating cylinder 6 has a cylindrical structure with its axis running vertically. A piston 72 is installed inside the regulating cylinder 6, and the piston 72 can be adjusted along the inner cavity of the regulating cylinder 6. Specifically, a second cylinder 7 is also installed at the top plate 102 of the frame 1. A second sliding rod 71 is fixedly connected to the upper end of the piston 72, and the sliding rod 71 is integrally fixedly connected to the telescopic end of the second cylinder 7. The telescopic movement of the piston 72 can be controlled by the second cylinder 7, thereby adjusting the pressure inside the regulating cylinder 6.

[0037] Reference Figure 2 As shown, a base 61 is fixedly installed at the bottom of the adjusting cylinder 6. The base 61 is fixedly connected to the frame 1 and can support and fix the adjusting cylinder 6. An adjusting rod 8 is installed through the base 61, and the adjusting rod 8 is coaxial with the adjusting cylinder 6.

[0038] The adjusting rod 8 includes a sealing slide section 81, which is slidably and sealingly connected to the base 61. A portion of the sealing slide section 81 extends into the inner cavity of the adjusting cylinder 6. Furthermore, the outer circumference of the sealing slide section 81 is cylindrical, and the base 61 also has a matching through hole. A sliding seal is installed within the through hole of the base 61, and a sliding seal is installed at the point where the sealing slide section 81 passes through the base 61. The sealing slide section 81 can slide up and down relative to the base 61 and can rotate axially to maintain a sealed connection.

[0039] A limiting block 83 is fixedly connected to the upper end of the sealing slide section 81, and the limiting block 83 is located in the inner cavity of the adjusting cylinder 6. Furthermore, the limiting block 83 is located below the piston 72, and can press against and block the piston 72. By adjusting the height of the limiting block 83, the extension and retraction of the cylinder 7 in its extended state can be adjusted, thereby regulating the actual lifting and lowering of the piston.

[0040] When the height of the limit block 8 is increased, the piston 72 of cylinder 2 will be blocked by the limit block 83 after a small displacement, resulting in a small boosting effect on the regulating cylinder 6. When the height of the limit block 8 is decreased, the piston 72 of cylinder 2 needs to be pushed by a larger displacement before being blocked by the limit block 83. The inner cavity of the regulating cylinder 6 will be subjected to greater compression, resulting in a greater boosting effect on the regulating cylinder 6.

[0041] Reference Figure 2 As shown, interface 2 63 is located on the lower outer periphery of the regulating cylinder 6. Its position is larger than that of the bottom of the regulating cylinder 6, so as to avoid blocking the extension and retraction of the piston 72 and thus preventing interface 2 63 from being blocked, and keeping the regulating cylinder 6 and the air pipe 9 in a continuous state of communication.

[0042] Furthermore, the adjusting rod 8 also includes a threaded section 82. The adjusting rod 8 is divided into two ends: the upper half is a cylindrical sealing slide section 81, and the lower half is a near-cylindrical threaded section 82. The threaded section 82 is integrally and fixedly connected to the lower end of the sealing slide section 81, and the threaded section 82 and the sealing slide section 81 are coaxially and fixedly connected.

[0043] A threaded hole is made in the base plate 101 of the frame 1, and the position of the threaded hole is adapted to the threaded section 82 of the adjusting rod 8. The lower part of the sealing slide section 81 is threadedly connected to the frame 1. By rotating the adjusting rod 8, the adjusting rod 8 can be adjusted up and down, thereby adjusting the height position of the limit block 83 to adjust the extension and retraction of the cylinder 7, thereby adjusting the pressurization effect of the adjusting cylinder 6 to the required state, and adjusting the initial pressure of the inner cavity of the workpiece 3 to the required pressure condition to meet the inspection requirements of the workpiece 3.

[0044] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An adjustable airtightness pressure testing device, characterized in that, The system includes a frame (1), a workpiece mounting base (2), a cover plate (4), and a cylinder (5). The workpiece mounting base (2) is fixedly installed on the frame (1) and is used to install the workpiece (3). The workpiece (3) has a top opening (31) at its upper end. The cover plate (4) is located directly above the workpiece (3) and opposite to the top opening (31). The cover plate (4) can seal the top opening (31). A slide rod (41) is integrally connected to the upper part of the cover plate (4). The cylinder (5) is fixedly installed on the frame (1) and can drive the slide rod (41) to adjust its height. The slide rod (41) has an air guide chamber (42) inside, which extends to the bottom of the cover plate (4) and can communicate with the top opening (31); the slide rod (41) has an interface (421) and an external interface (422) on its outside, which is used to connect to an external pressure air source; it also includes an adjusting cylinder (6), which has an interface (63) and is connected to the interface (421) through an air guide pipe (9), and the pressure inside the adjusting cylinder (6) can be adjusted.

2. The adjustable airtightness pressure testing device according to claim 1, characterized in that, The frame (1) includes a base plate (101) and a top plate (102), which are arranged opposite each other. The workpiece mounting seat (2) is fixedly installed on the upper side of the base plate (101), and the cylinder (5) is fixedly installed on the top plate (102). The cylinder (5) has a telescopic end facing downward, and the telescopic end is integrally fixedly connected to the slide rod (41).

3. The adjustable airtightness pressure testing device according to claim 1, characterized in that, The regulating cylinder (6) has a cylindrical structure, and a piston (72) is installed inside the regulating cylinder (6). The piston (72) is driven by the extension and retraction of the cylinder (7).

4. The adjustable airtightness pressure testing device according to claim 3, characterized in that, The upper end of the piston (72) is fixedly connected to a slide rod (71), and the slide rod (71) is integrally fixedly connected to the telescopic end of the cylinder (7).

5. The adjustable airtightness pressure testing device according to claim 4, characterized in that, A base (61) is fixedly installed at the bottom of the regulating cylinder (6), and an adjusting rod (8) is installed through the base (61). The adjusting rod (8) includes a sealing slide section (81), which is slidably and sealingly connected to the base (61). A limit block (83) is fixedly connected to the upper end of the sealing slide section (81).

6. The adjustable airtightness pressure testing device according to claim 5, characterized in that, The limiting block (83) is located on the lower side of the piston (72), and the limiting block (83) can press against and block the piston (72).

7. The adjustable airtightness pressure testing device according to claim 5, characterized in that, The sealing slide section (81) is fitted with a sliding seal at the position where it passes through the base (61).

8. An adjustable airtightness pressure testing device according to claim 5, characterized in that, The second interface (63) is located on the lower outer periphery of the regulating cylinder (6).

9. An adjustable airtightness pressure testing device according to claim 5, characterized in that, The adjusting rod (8) also includes a threaded section (82), which is integrally fixedly connected to the lower end of the sealing slide section (81). The threaded section (82) and the sealing slide section (81) are coaxially arranged. The lower part of the sealing slide section (81) is threadedly connected to the frame (1).

10. An adjustable airtightness pressure testing device according to claim 5, characterized in that, The base (61) is fixedly connected to the frame (1).

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