A device for adjustable microleakage

Abstract

The utility model relates to a device of adjustable trace leakage relates to airtightness detection equipment calibration technical field, including valve body, rotation adjustment sleeve, adjustment cone sleeve, compression sleeve, compression sleeve pipe, tetrafluoroethylene capillary, fixed assembly, the valve body front end is equipped with leakage hole, compression sleeve pipe fixed mounting in the leakage hole, tetrafluoroethylene capillary is passed through and is arranged in the compression sleeve pipe inside, the inner hole rear end of rotation adjustment sleeve can rotate and is installed on the valve body middle part outer circle, adjustment cone sleeve is installed between the inner hole front end of rotation adjustment sleeve and valve body, compression sleeve sleeve joint is in the valve body's front end, and the front end of compression sleeve still is equipped with compression sleeve pipe through -hole, fixed assembly is installed on rotation adjustment sleeve, the utility model discloses through rotating rotation adjustment sleeve drive adjustment cone sleeve and compression sleeve axial movement, change tetrafluoroethylene capillary's aperture, to accurate control leakage amount, the device simple structure, adjustment is convenient, and the stability is high, can replace import standard leak, is applicable to the calibration of automobile parts airtightness detection sample piece.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing equipment calibration technology, specifically an adjustable micro-leakage device for airtightness testing of automotive parts. Background Technology

[0002] In the production of automotive aluminum alloy die-cast parts, a certain number of die-casting defects are inevitably generated due to the influence of various process parameters, such as porosity, shrinkage cavities, cracks, and cold shuts. These defects can lead to quality problems such as oil and air leaks after the products are assembled into complete vehicles. To ensure product quality, 100% airtightness testing is required, and the integrity of the testing equipment must be verified using standard samples. It must be ensured that the equipment pipelines and instruments meet the set verification parameter requirements. Therefore, the stability of the airtightness testing samples affects the entire product manufacturing process. Currently, the imported standard leak points provided by leak detectors used for equipment calibration are expensive and unsuitable for on-site sealing, resulting in poor versatility. Therefore, domestically, standard samples are generally obtained through random screening. The specific method is as follows: after screening for samples that meet the specified leakage values, stability is retested 50 times. If the leakage value is within the specified range, the sample is sealed and recorded as a non-conforming sample. Completely leak-free samples are made from products with extremely low airtightness test values. After three or more immersion tests, stability is retested 50 times. If the leakage value is within the specified range, the sample is sealed and recorded as a qualified sample for testing. However, this random screening method has the following problems: (1) The leakage of the airtight test sample cannot be adjusted during use. Often, even when the equipment meets the standards, due to the influence of environmental factors such as humidity, oxidation and corrosion, the unqualified sample will exhibit unstable leakage values ​​and drift during the verification process, causing unnecessary waste in the production process.

[0003] (2) The screening process is time-consuming and labor-intensive, and has poor stability. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an adjustable micro-leakage device, which solves the problems of the existing technology, such as the inability to adjust the leakage amount, the time-consuming and labor-intensive screening process, poor stability, high price of standard leak outlets, and poor versatility.

[0005] The technical solution to the above-mentioned technical problem is: a device for adjusting minute leakage, comprising: The valve body has a leakage hole at its front end; A compression sleeve is fixedly installed inside the leakage hole; A tetrafluoroethylene capillary tube is disposed through the inside of the compression sleeve; A rotating adjusting sleeve, the rear end of its inner hole being rotatably mounted on the outer circle of the middle part of the valve body; An adjusting cone sleeve is installed between the front end of the inner hole of the rotating adjusting sleeve and the valve body; A compression sleeve is fitted onto the front end of the valve body, and the tapered outer circle of the compression sleeve matches the tapered hole of the adjusting tapered sleeve. The front end of the compression sleeve is also provided with a compression sleeve through hole. The fixing component, installed on the rotating adjusting sleeve, is used to fix the position of the adjusting cone sleeve after a minor leak.

[0006] A further technical solution of this utility model is that the valve body is divided into a valve nozzle section, a threaded section, a valve body section, a hexagonal section, and a connecting section from the front end to the rear end. The leakage hole is provided on the valve nozzle section, the rotary adjustment sleeve is installed on the outer circle of the valve body section, and the compression sleeve is sleeved on the outer circle of the valve nozzle section.

[0007] A further technical solution of this utility model is that the valve body section of the valve body is also provided with an annular limiting groove, and the rear end of the inner hole of the rotary adjusting sleeve is provided with a through pin hole I along the radial direction. The rotary adjusting sleeve is connected to the annular limiting groove of the valve body through the limiting pin I installed in the pin hole I.

[0008] A further technical solution of this utility model is that a continuous limiting groove II is symmetrically opened on the inner wall of the rotary adjusting sleeve along its axial direction; the adjusting cone sleeve is provided with a pin hole II, and the adjusting cone sleeve is connected to the limiting groove II of the rotary adjusting sleeve through the limiting pin II located in the pin hole II.

[0009] A further technical solution of this utility model is that the rear end of the tapered hole of the adjusting cone sleeve is also connected to a straight threaded hole; the threaded section of the valve body is fastened to the straight threaded hole of the adjusting cone sleeve by thread.

[0010] A further technical solution of this utility model is that the fixing component includes a set screw and a thin nut. The set screw passes through the thin nut and the rotating adjustment sleeve in sequence, and its end is pressed against the outer circle of the adjustment cone sleeve after the adjustment is completed.

[0011] Due to the above-described structure, the device for adjusting minute leaks according to this invention has the following advantages compared to the prior art: 1. Leakage can be precisely adjusted. This utility model includes a valve body, a compression sleeve, a PTFE capillary tube, a rotary adjusting sleeve, an adjusting cone sleeve, and a compression sleeve. When using the fixed component, first rotate the rotating adjusting sleeve. Through the threaded transmission, the adjusting cone sleeve is pushed to move axially. The conical surface of the adjusting cone sleeve squeezes the small end of the compression sleeve, causing the compression sleeve to contract radially and compress the PTFE capillary. The inner diameter of the PTFE capillary decreases, thereby achieving precise control of the leakage. Tests have shown that rotating the rotating adjusting sleeve by 30° corresponds to a leakage change of about 0.5 mL / min.

[0012] 2. High stability This invention uses a PTFE capillary tube as the core regulating component, which is corrosion-resistant, oxidation-resistant, and avoids clogging. It can avoid the drift problem caused by oxidation clogging of traditional metal samples, and its stability is high.

[0013] 3. Easy to adjust This invention allows for quick adjustment of leakage by simply rotating the adjusting sleeve, without the need to replace the standard sample. Its adjustment is convenient and can significantly improve production efficiency.

[0014] 4. Good versatility This utility model has a simple structure, good versatility, can adapt to different leakage value requirements, can be used in batches on unqualified samples in the field, and can replace imported standard leaks in batches.

[0015] 5. It can reduce production costs.

[0016] Because this invention can precisely adjust the leakage amount, it is only necessary to install this device on all unqualified samples at the production site. By rotating the adjustment sleeve, the leakage amount can be precisely adjusted to meet the testing standards, replacing the traditional screening method, thereby avoiding waste and greatly reducing production costs.

[0017] The technical features of an adjustable micro-leakage device of the present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 : A schematic diagram of the structure of an adjustable micro-leakage device of this utility model (state before adjustment); Figure 2 : Figure 1 The left view; Figure 3 : Figure 1 AA section view; Figure 4 : Figure 2 BB section view; Figure 5 : Figure 4 Enlarged view of part C; Figure 6 : A schematic diagram of the valve body described in Example 1; In the above figures, the reference numerals are explained as follows: 1-Valve body, 101 - Valve nozzle section, 1011 - Leakage hole, 102 - Threaded section 103 - Valve body section, 1031 - Annular limiting groove, 104 - Hexagonal section, 105 - Connecting section 2-Rotary adjusting sleeve, 3-Adjusting cone sleeve, 4-Compression sleeve, 5-Limit pin I, 6-Compression sleeve, 7-PTFE capillary tube, 8-Fixing component, 801-Set screw, 802-Thin nut, 9 - Limit pin II, Q - Front end direction, H - Rear end direction. Detailed Implementation Example 1

[0019] A device for adjusting minute leakage includes a valve body 1, a rotary adjusting sleeve 2, an adjusting cone sleeve 3, a compression sleeve 4, a compression tube 6, a PTFE capillary tube 7, and a fixing assembly 8, wherein: The valve body 1 is divided into a valve nozzle section 101, a threaded section 102, a valve body section 103, a hexagonal section 104, and a connecting section 105 from the front end to the rear end. The valve nozzle section 101 is provided with a leakage hole 1011, and the valve body section 103 is provided with an annular limiting groove 1031. The hexagonal section 104 is convenient for rotation operation, and the connecting section 105 is used to connect with the inner cavity of the product.

[0020] The compression sleeve 6 is fixedly installed in the leakage hole 1011 of the valve nozzle section 101. The compression sleeve 6 is made of stainless steel, and the front end of the compression sleeve 6 is interference-fitted with the leakage hole 1011.

[0021] The PTFE capillary 7 is disposed inside the compression sleeve 6.

[0022] The rotary adjusting sleeve 2 is fitted on the outer circle of the valve body section 103 of the valve body 1. The rear end of the inner hole of the rotary adjusting sleeve 2 is provided with a through pin hole I along the radial direction. The rotary adjusting sleeve 2 is connected to the annular limiting groove 1031 of the valve body 1 through a limiting pin I5 installed in the pin hole I. The inner wall of the rotary adjusting sleeve 2 is symmetrically provided with a continuous limiting groove II along its axial direction.

[0023] The adjusting cone sleeve 3 is installed between the front end of the inner hole of the rotating adjusting sleeve 2 and the valve body 1. A pin hole II is provided on the outer circumference of the adjusting cone sleeve 3. The adjusting cone sleeve 3 is connected to the limiting groove II of the rotating adjusting sleeve 2 via a limiting pin II9 located within the pin hole II, and moves axially as the limiting pin II9 rotates. The rear end of the cone hole of the adjusting cone sleeve 3 is also connected to a straight threaded hole, which is threadedly fastened to the threaded section 102 of the valve body 1.

[0024] The compression sleeve 4 is sleeved on the outer circle of the valve nozzle section 101 of the valve body 1, and the conical outer circle of the compression sleeve 4 matches the conical hole of the adjusting conical sleeve 3. The front end of the compression sleeve 4 is also provided with a compression sleeve through hole.

[0025] The fixing component 8 is used to fix the position of the adjusting cone sleeve 3 after adjusting for a small leak. The fixing component 8 includes a set screw 801 and a thin nut 802. The set screw 801 passes through the thin nut 802 and the rotating adjusting sleeve 2 in sequence, and its end is pressed against the outer circle of the adjusting cone sleeve 3 after the adjustment is completed.

[0026] Assembly and adjustment steps of this utility model: S1. Pre-installed capillary tube: First, install the PTFE capillary tube 7 inside the compression sleeve 6, and then press the compression sleeve 6 into the leakage hole 1011 of the valve nozzle 101 until the end face is flush. S2. Install the rotating mechanism: Install the rotating adjusting sleeve onto the valve body, and press the limit pin I into the annular limit groove of the valve body to ensure that the rotating adjusting sleeve rotates without jamming; then install the fixing component, but do not tighten the rotating adjusting sleeve. It needs to rotate without jamming. After adjusting the leakage value later, tighten the rotating adjusting sleeve fixing component. S3. Assemble the tapered sleeve assembly: With the small end of the compression sleeve 4 facing forward, insert the compression sleeve tube through the hole into the compression sleeve tube 6, and with the large end tightly against the end face of the threaded section of the valve body; install the limiting pin II 9 in the pin hole II of the adjusting tapered sleeve 3, align the limiting pin II 9 with the limiting groove II of the rotating adjusting sleeve 2, and drive the rotating adjusting sleeve 2 to fit onto the threaded section 102 of the valve body 1 and the compression sleeve 4. S4. Coarse adjustment of leakage: Rotate the adjusting sleeve clockwise to push the adjusting cone sleeve to move axially through the threaded transmission. The cone surface of the adjusting cone sleeve squeezes the small end of the compression sleeve, causing the compression sleeve to contract radially and compress the PTFE capillary. The inner diameter of the PTFE capillary decreases, and the leakage decreases. Rotate the adjusting sleeve 2 counterclockwise to release the PTFE capillary from the compression sleeve 4, and the leakage increases. S5. Fine-tuning and locking: Connect the airtightness gauge and fine-tune to the target leakage value; S6. Adjustment complete: Tighten the set screw 801 to press against the adjusting cone sleeve 3, and the thin nut 802 to prevent loosening.

Claims

1. A device for adjusting minute leakage, characterized in that, include: The valve body (1) has a leakage hole (1011) at its front end. A compression sleeve (6) is fixedly installed inside the leakage hole (101). A tetrafluoroethylene capillary tube (7) is disposed inside the compression sleeve (6); The rotating adjusting sleeve (2) has its inner hole rear end rotatably mounted on the outer circle of the middle part of the valve body (1); Adjusting cone sleeve (3) is installed between the front end of the inner hole of the rotating adjusting sleeve (2) and the valve body (1); The compression sleeve (4) is fitted onto the front end of the valve body (1), and the tapered outer circle of the compression sleeve (4) matches the tapered hole of the adjusting tapered sleeve (3). The front end of the compression sleeve (4) is also provided with a compression sleeve through hole. The fixing component (8) is installed on the rotating adjusting sleeve (2) to fix the position of the adjusting cone sleeve (3) after adjusting for minor leakage.

2. The device for adjusting minute leakage according to claim 1, characterized in that, The valve body (1) is divided into a valve nozzle section (101), a threaded section (102), a valve body section (103), a hexagonal section (104), and a connecting section (105) from the front end to the rear end. The leakage hole (1011) is provided on the valve nozzle section (101). The rotary adjustment sleeve (2) is installed on the outer circle of the valve body section (103). The compression sleeve (4) is sleeved on the outer circle of the valve nozzle section (101).

3. The device for adjusting minute leakage according to claim 2, characterized in that, The valve body section (103) of the valve body (1) is also provided with an annular limiting groove (1031). The rear end of the inner hole of the rotary adjusting sleeve (2) is provided with a through pin hole I along the radial direction. The rotary adjusting sleeve (2) is connected to the annular limiting groove (1031) of the valve body (1) by a limiting pin I (5) installed in the pin hole I.

4. The device for adjusting minute leakage according to claim 1, characterized in that, The inner wall of the rotary adjustment sleeve (2) is symmetrically provided with a continuous limiting groove II along its axial direction; the adjustment cone sleeve (3) is provided with a pin hole II, and the adjustment cone sleeve (3) is connected to the limiting groove II of the rotary adjustment sleeve (2) through the limiting pin II (9) located in the pin hole II.

5. The device for adjusting minute leakage according to claim 2, characterized in that, The rear end of the tapered hole of the adjusting cone sleeve (3) is also connected to a straight threaded hole; the threaded section (102) of the valve body (1) is fastened to the straight threaded hole of the adjusting cone sleeve (3) by thread fastening.

6. The device for adjusting minute leakage according to claim 2, characterized in that, The fixing component (8) includes a set screw (801) and a thin nut (802). The set screw (801) passes through the thin nut (802) and the rotating adjustment sleeve (2) in sequence, and its end is pressed against the outer circle of the adjusting cone sleeve (3) after the adjustment is completed.

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