Air tightness test fixture

Abstract

An air tightness test fixture comprises a working box body, a fixture support is fixed at the bottom end in the working box body, a water inlet hole and a water outlet hole which are symmetrical are formed in the inner wall of the rear portion of the working box body, a communicating pipe is fixedly arranged in the water inlet hole and the water outlet hole, a circulating pump is arranged on the other side of the communicating pipe, and the circulating pump is communicated with the water inlet hole and the water outlet hole. The other side of the circulating pump is connected with a water tank, the circulating pump and the water tank are fixedly connected through a communicating pipe, a positioning and fixing assembly is arranged on the left side of the working box body, and a gas connecting and testing assembly is arranged on the right side of the working box body. The jig is positioned and fixed through the hydraulic mechanism, so that a closed space is formed in the jig, the air tightness of the jig is tested by pressurizing air in the jig and observing the change condition of the air pressure in the jig, each jig is prevented from being immersed in water to be cleaned and dried, and meanwhile, when leakage points exist, the leakage points are detected to be detected. And water is injected into the working box body, and meanwhile, gas is slowly pressurized into the jig, so that leakage points can be more rapidly checked out.

Description

Technical Field

[0001] This utility model relates to the field of parts inspection technology, and more specifically, to an airtightness testing fixture. Background Technology

[0002] In airtightness testing, the most common method is the bubble method. The bubble method involves sealing the opening of the part, placing it in water, and then collecting the bubbles that leak out over a certain period of time to measure the amount of leakage. This allows for direct observation of the location and extent of the leak.

[0003] However, since the location and amount of leakage in the parts are unknown in advance, it is difficult to collect all the air bubbles, which affects the accuracy of the measurement. At the same time, all the parts used need to be soaked in water, so the parts need to be cleaned and dried after the test. It is impossible to achieve automatic and quantitative leak detection, which needs to be improved. Therefore, we propose an airtightness testing fixture. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] The purpose of this utility model is to provide an airtightness testing fixture to solve the problems mentioned in the background art, which require each part to be soaked before airtightness testing, and each part to be cleaned and dried after the test.

[0006] 2. Technical Solution

[0007] An airtightness testing fixture includes a working chamber, with a fixture support fixed to the bottom of the working chamber. The rear inner wall of the working chamber has symmetrical water inlet and outlet holes. A connecting pipe is fixed inside the water inlet and outlet holes. A circulation pump is provided on the other side of the connecting pipe. A water tank is connected to the other side of the circulation pump. The circulation pump and the water tank are fixedly connected by a connecting pipe. A positioning and fixing component is provided on the left side of the working chamber, and an airtightness testing component is provided on the right side of the working chamber.

[0008] Preferably, the positioning and fixing assembly includes a fixing screw, a hydraulic mechanism, a positioning sealing ring, a fixing pressure plate, a sliding support rod, and a hydraulic drive inner rod. The hydraulic mechanism is disposed through the left side of the working box. A fixing screw is provided on the left side of the hydraulic mechanism. The fixing screw passes through the lower end of the left fixing screw of the hydraulic mechanism and is threadedly connected to the left side of the working box. The hydraulic drive inner rod is slidably connected inside the hydraulic mechanism. A fixing pressure plate is provided at the right end of the hydraulic drive inner rod. The fixing pressure plate is fixedly connected to the right end of the hydraulic drive inner rod. A positioning sealing ring is provided at the right end of the fixing pressure plate. A sliding support rod is provided on the outer right side of the hydraulic mechanism.

[0009] Preferably, the air contact test assembly includes a perforated sealing ring, a first mounting block, a support rod, an air inlet pipe, and a mounting base plate. The mounting base plate is provided on the right inner wall of the working chamber, and the support rod is provided on the left side of the mounting base plate. The support rod is fixedly connected to the mounting base plate. The first mounting block is disposed on the right side of the working chamber through the mounting base plate. The left end of the first mounting block is provided with a perforated sealing ring. An air contact hole is provided through the interior of the perforated sealing ring and the first mounting block, and an air inlet pipe is provided inside the air contact hole.

[0010] Preferably, an air pump is provided at the right end of the air intake pipe, and a direct pressure sensor and an air passage valve are provided outside the right end of the air intake pipe. The interior of the direct pressure sensor and the air passage valve are connected to the interior of the air intake pipe.

[0011] Preferably, the left end of the intake pipe is provided with an intake sealing ring, and the cross-section of the intake sealing ring is in the shape of an "I".

[0012] Preferably, a fixture support is fixed to the bottom of the inner part of the working box, and a fixture is provided at the top of the fixture support.

[0013] 3. Beneficial effects

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] This invention uses a hydraulic mechanism to position and fix the fixture, creating a sealed space inside. By pressurizing the gas inside the fixture and observing the pressure changes, the airtightness of the fixture is tested, avoiding the cleaning and drying process required for immersing each fixture in water. Furthermore, when a leak is found in the fixture, water is injected into the working chamber while the gas inside the fixture is slowly pressurized, allowing for a more rapid identification of the leak. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a front sectional view of the overall structure of this utility model;

[0018] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a partial anatomical view of the structure of this utility model.

[0020] Figure 5 This is a top view of part of the structure of this utility model;

[0021] The following are the labels in the diagram: 1. Working box; 2. Fixture; 3. Perforated sealing ring; 4. First mounting block; 5. Support rod; 6. Direct pressure sensor; 7. Air valve; 8. Air inlet pipe; 9. Air pump; 10. Fixing screw; 11. Hydraulic rod; 12. Circulation pump; 13. Connecting pipe; 14. Water tank; 15. Fixture bracket; 16. Water inlet; 17. Water outlet; 18. Mounting base plate; 19. Positioning sealing ring; 20. Fixing pressure plate; 21. Sliding support rod; 22. Hydraulic drive inner rod; 23. Air inlet sealing ring. Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 of this utility model.

[0023] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Please see Figure 1-5 This utility model provides a technical solution:

[0025] An airtightness testing fixture includes a working chamber 1. A fixture support 15 is fixed to the bottom of the working chamber 1. Symmetrical water inlet holes 16 and water outlet holes 17 are opened on the rear inner wall of the working chamber 1. A connecting pipe 13 is fixed inside the water inlet holes 16 and water outlet holes 17. A circulation pump 12 is provided on the other side of the connecting pipe 13. A water tank 14 is connected to the other side of the circulation pump 12. The circulation pump 12 and the water tank 14 are fixedly connected by the connecting pipe 13. A positioning and fixing component is provided on the left side of the working chamber 1, and an air contact testing component is provided on the right side of the working chamber 1.

[0026] The positioning and fixing assembly includes a fixing screw 10, a hydraulic mechanism 11, a positioning seal ring 19, a fixing pressure plate 20, a sliding support rod 21, and a hydraulic drive inner rod 22. The hydraulic mechanism 11 is disposed on the left side of the working box 1. The fixing screw 10 is located on the left side of the hydraulic mechanism 11. The lower end of the fixing screw 10 passes through the left side of the hydraulic mechanism 11 and is threadedly connected to the left side of the working box 1. The hydraulic drive inner rod 22 is slidably connected inside the hydraulic mechanism 11. The right end of the hydraulic drive inner rod 22 is provided with a fixing pressure plate 20. The fixing pressure plate 20 is connected to the hydraulic drive inner rod 22. The right end of the inner rod 22 is fixedly connected, and the right end of the fixed pressure plate 20 is provided with a positioning sealing ring 19. The positioning sealing ring 19 is fixedly connected to the right end of the fixed pressure plate 20. The right side of the hydraulic mechanism 11 is provided with a sliding support rod 21. The sliding support rod 21 ensures that the hydraulic mechanism 11 operates smoothly during the positioning process. Through the action of the hydraulic mechanism 11, the internal hydraulic pressure of the hydraulic mechanism 11 drives the inner rod 22 to push the fixed pressure plate 20 to position and fix the fixture 2. The positioning sealing ring 19 is tightly fitted to the left end of the fixture 2, so that the left end of the fixture 2 is in a sealed state.

[0027] The air contact test assembly includes a perforated sealing ring 3, a first mounting block 4, a support rod 5, an air inlet pipe 8, and a mounting base plate 18. The mounting base plate 18 is located on the inner right side of the working chamber 1, and the support rod 5 is located on the left side of the mounting base plate 18. The support rod 5 is fixedly connected to the mounting base plate 18. The first mounting block 4 passes through the mounting base plate 18 and is located on the right side of the working chamber 1. The perforated sealing ring 3 is located at the left end of the first mounting block 4. An air contact hole is provided through the perforated sealing ring 3 and the first mounting block 4. An air inlet pipe 8 is provided inside the air contact hole. Air is introduced into the fixture 2 through the air inlet pipe 8 to pressurize it, thereby testing the air tightness of the fixture 2.

[0028] An air pump 9 is installed at the right end of the air intake pipe 8. A direct pressure sensor 6 and an air passage valve 7 are installed outside the right end of the air intake pipe 8. The interior of the direct pressure sensor 6 and the air passage valve 7 are connected to the interior of the air intake pipe 8. The gas inside the fixture 2 is pressurized through the air passage valve 7, and the air tightness of the fixture 2 is detected by the direct pressure sensor.

[0029] An intake sealing ring 23 is provided at the left end of the intake pipe 8, and the cross-section of the intake sealing ring 23 is in the shape of an "I".

[0030] The bottom of the work box 1 is fixed with a fixture bracket 15, and the top of the fixture bracket 15 is equipped with a fixture 2.

[0031] Working principle: When an airtightness test is required, the fixture 2 to be tested is placed on the fixture support 15. The hydraulic mechanism 11 is started. The hydraulic drive rod 22 inside the hydraulic mechanism 11 pushes the fixed pressure plate 20. The fixed pressure plate 20 pushes the positioning sealing ring 19. The positioning sealing ring 19 pushes the fixture 2 to slide to the right. The right side of the fixture 2 is supported by the perforated sealing ring 3, which fixes the position of the fixture 2. The air pump 9 is controlled by the air circuit valve 7 to pressurize the gas inside the fixture 2 through the air inlet pipe 8. The air circuit valve 7 is closed, and the reading of the direct pressure sensor 6 is observed to measure the airtightness of the fixture 2. When there is a leak in the fixture 2, the circulation pump 12 is started to add water to the inside of the working chamber 1. At the same time, the air circuit valve 7 is opened to slowly pressurize the gas inside the fixture 2. The location of the bubbles generated on the outside of the fixture 2 is observed to complete the investigation of the leak point of the fixture 2.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An airtightness testing fixture, comprising a working chamber (1), characterized in that: The rear inner wall of the working chamber (1) is provided with symmetrical water inlet holes (16) and water outlet holes (17). A connecting pipe (13) is fixed inside the water inlet holes (16) and water outlet holes (17). A circulation pump (12) is provided on the other side of the connecting pipe (13). A water tank (14) is connected to the other side of the circulation pump (12). The circulation pump (12) and the water tank (14) are fixedly connected by the connecting pipe (13). A positioning and fixing component is provided on the left side of the working chamber (1), and an air connection test component is provided on the right side of the working chamber (1).

2. The airtightness testing fixture according to claim 1, characterized in that: The positioning and fixing assembly includes a fixing screw (10), a hydraulic mechanism (11), a positioning seal ring (19), a fixing plate (20), a sliding support rod (21), and a hydraulic drive inner rod (22). The hydraulic mechanism (11) is disposed through the left side of the working box (1). The fixing screw (10) is provided on the left side of the hydraulic mechanism (11). The fixing screw (10) passes through the lower end of the fixing screw (10) on the left side of the hydraulic mechanism (11) and is threadedly connected to the left side of the working box (1). The hydraulic drive inner rod (22) is slidably connected inside the hydraulic mechanism (11). The fixing plate (20) is provided at the right end of the hydraulic drive inner rod (22). The fixing plate (20) is fixedly connected to the right end of the hydraulic drive inner rod (22). The positioning seal ring (19) is provided at the right end of the fixing plate (20). The sliding support rod (21) is provided on the right side of the hydraulic mechanism (11).

3. The airtightness testing fixture according to claim 1, characterized in that: The air contact test assembly includes a perforated sealing ring (3), a first mounting block (4), a support rod (5), an air inlet pipe (8), and a mounting base plate (18). The mounting base plate (18) is provided on the inner right side of the working box (1), and the support rod (5) is provided on the left side of the mounting base plate (18). The support rod (5) is fixedly connected to the mounting base plate (18). The first mounting block (4) passes through the mounting base plate (18) and is located on the right side of the working box (1). The perforated sealing ring (3) is provided at the left end of the first mounting block (4). An air contact hole is provided through the interior of the perforated sealing ring (3) and the first mounting block (4), and an air inlet pipe (8) is provided inside the air contact hole.

4. The airtightness testing fixture according to claim 3, characterized in that: An air pump (9) is provided at the right end of the air intake pipe (8). A direct pressure sensor (6) and an air passage valve (7) are provided outside the right end of the air intake pipe (8). The interiors of the direct pressure sensor (6) and the air passage valve (7) are connected to the interior of the air intake pipe (8).

5. The airtightness testing fixture according to claim 3, characterized in that: The left end of the air intake pipe (8) is provided with an air intake sealing ring (23), and the cross-section of the air intake sealing ring (23) is "I".

6. The airtightness testing fixture according to claim 1, characterized in that: The bottom of the working box (1) is fixed with a jig bracket (15), and a jig (2) is provided at the top of the jig bracket (15).

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