A mechanical pneumatic pressure regulating valve testing device and its testing method

Abstract

This invention discloses a testing device and method for a mechanical pneumatic pressure regulating valve. The device comprises two chambers: a first chamber and a second chamber, with an intermediate wall between them. A mechanical pneumatic pressure regulating valve is mounted on this intermediate wall. The first chamber is connected to an air compressor / pump and is also connected to a pressure gauge. The second chamber is connected to a pressure gauge. This device features high reliability of test results, simple structure, convenient operation, and fast testing speed.

Description

Technical Field

[0001] This invention relates to mechanical pneumatic pressure regulating valves, and more particularly to a testing device and testing method for mechanical pneumatic pressure regulating valves. Background Technology

[0002] During storage and transportation, the product is in a sealed packaging environment. To ensure that the air pressure in this sealed environment remains within a certain range in atmospheric conditions such as high altitudes or oceans, meeting the normal storage pressure requirements and guaranteeing stable and reliable product quality, a highly sensitive mechanical air pressure regulating valve is installed on the packaging to regulate the internal air pressure, addressing pressure variations caused by different environmental conditions. Since the proper functioning of the air pressure regulating valve plays a crucial role in maintaining a specific pressure range within the product packaging, it is necessary to accurately detect the valve's opening pressure threshold to determine its proper operation.

[0003] The main method for testing pneumatic pressure regulating valves currently involves mounting the valve on a testing device, which is a cavity made of welded metal plates. A pressure gauge is connected to the device to measure the internal pressure. The internal cavity of the device is then pressurized or depressurized to the valve's opening threshold range. The valve's opening value is then determined by listening to the sound and spraying aerated water. This process confirms whether the valve's opening value is within its operating range.

[0004] Existing methods for testing pneumatic pressure regulating valves rely on human intervention to listen to sounds and identify the valve's opening pressure at the inlet / outlet, which is difficult to quantify. The positive pressure listening method is heavily influenced by human factors, resulting in insufficient accuracy. The water spray method can easily cause the regulating valve to rust, damaging its lifespan and operational precision. Negative pressure opening values ​​are difficult to identify through sound alone, making verification challenging. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a detection device and method suitable for mechanical pneumatic regulating valves that is simple to operate, has high detection stability and high detection accuracy.

[0006] 1. A detection device for a mechanical air pressure regulating valve, characterized in that: it includes a first chamber and a second chamber, an intermediate chamber wall is provided between the first chamber and the second chamber, a mechanical air pressure regulating valve is installed on the intermediate chamber wall, the first chamber is connected to an air compressor / air pump, the first chamber is also connected to a pressure gauge, and the second chamber is connected to a pressure gauge.

[0007] Preferably, the pressure gauge is a digital barometer.

[0008] To further ensure detection accuracy, the volume of chamber two is smaller than that of chamber one, and the volume ratio of chamber one to chamber two is 20:1 to 30:1.

[0009] Preferably, the air compressor / pump is connected to the chamber via an inflation pipe, and a ball valve is provided on the inflation pipe.

[0010] Furthermore, the detection device includes a cylindrical body, with a lower chamber (Case 1) and an upper chamber (Case 2). A cap is provided at the top of the cylindrical body, and a sealing ring is provided between the cap and the top of the cylindrical body. An air nozzle communicating with the second chamber is provided on the cap, and the air nozzle is connected to the second pressure gauge via a pressure detection pipe.

[0011] To further improve detection sensitivity, the test range of the pressure gauge 2 is -30Pa to 30Pa.

[0012] Preferably, both the lower and upper parts of the cylinder are cylindrical, and the diameter of the lower part of the cylinder is larger than the diameter of the upper part of the cylinder. A handle is also provided on the outer wall of the lower part of the cylinder.

[0013] 2. A testing method for a testing device for a mechanical pneumatic pressure regulating valve, using the testing device described above, comprising the following steps:

[0014] (a): Positive pressure detection

[0015] Step 1: Turn on the air compressor / air pump, open the ball valve, and slowly inflate the chamber through the inflation pipe;

[0016] Step 2: Observe the air pressure in chamber 1 in real time according to the reading of pressure gauge 1;

[0017] Step 3: Continuously inflate until the air pressure in chamber one reaches the opening pressure of the mechanical air pressure regulating valve. The mechanical air pressure regulating valve opens to release pressure into chamber two, causing the air pressure in chamber two to increase. Pressure gauge two detects the pressure change in chamber two through the air pressure detection pipeline, which in turn causes the reading of pressure gauge two to change. At this time, the mechanical air pressure regulating valve reaches the opening threshold, and the reading of pressure gauge one is the opening pressure value of the mechanical air pressure regulating valve.

[0018] (II): Negative pressure detection

[0019] Step 1: Turn on the air pump, open the ball valve, and slowly pump air into the chamber through the inflation pipe.

[0020] Step 2: Observe the air pressure in chamber 1 in real time according to the reading of pressure gauge 1;

[0021] Step 3: Continuously pump air until the air pressure in chamber one reaches the opening pressure of the mechanical air pressure regulating valve. The mechanical air pressure regulating valve opens, and chamber two pressurizes chamber one, causing the air pressure in chamber two to decrease. Pressure gauge two detects the pressure change in chamber two through the air pressure detection pipeline, which in turn causes the reading of pressure gauge two to change. At this time, the mechanical air pressure regulating valve reaches the opening threshold, and the reading of pressure gauge one is the opening pressure value of the mechanical air pressure regulating valve.

[0022] Beneficial effects:

[0023] 1. The detection device of the present invention has high detection stability: the pressure gauge is a traditional mechanical pointer type pressure gauge, which is not easily affected by environmental factors such as temperature and humidity, thus affecting its normal operation. The sealing part of the second chamber is sealed with a circular sealing ring designed according to national standards.

[0024] 2. The detection device of this invention has high detection accuracy: the design volume of chamber two is 200 cm³. 3 ~300 cm 3 When the regulating valve is working, the air pressure in the cabin changes rapidly. The selected pressure gauge two has a detection accuracy of -30Pa to 30Pa, which is highly accurate and sensitive. The combined use of cabin two and pressure gauge two has the characteristics of high detection accuracy and sensitivity.

[0025] 3. The detection device of the present invention can repeatedly, accurately, and efficiently check whether the pressure regulating valve can open and close normally without damaging the pressure regulating valve.

[0026] 4. The detection device of the present invention can identify the positive and negative opening pressure of the air pressure regulating valve, check whether the opening / closing pressure threshold of the air pressure regulating valve is within the specified range of the design, and determine whether the air pressure regulating valve is a qualified product. Attached Figure Description

[0027] The accompanying drawings of this invention are described below.

[0028] Figure 1 This is a structural diagram of a testing device for a mechanical pneumatic pressure regulating valve.

[0029] Figure 2 This is a diagram of the cylindrical structure.

[0030] Figure 3 This is a structural diagram of the cylinder cover.

[0031] Labeling Explanation: 1. Cylinder, 2. Handle, 3. Mechanical air pressure regulating valve, 4. Sealing ring, 5. Cylinder cover, 6. Air nozzle, 7. Air pressure detection pipeline, 8. Pressure gauge one (digital air pressure gauge), 9. Pressure gauge two, 10. Ball valve, 11. Inflation pipeline, 12. Air compressor / air pump. Detailed Implementation

[0032] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0033] Example 1: As Figure 1 As shown, this embodiment provides a detection device for a mechanical air pressure regulating valve, including a first chamber and a second chamber. A common intermediate cavity wall is provided between the first chamber and the second chamber. A mechanical air pressure regulating valve is installed on the intermediate cavity wall. The first chamber is connected to an air compressor / air pump. The first chamber is also connected to a pressure gauge, and the second chamber is connected to a pressure gauge.

[0034] The first chamber and the second chamber can be arranged horizontally or vertically. Preferably, the volume ratio of the first chamber and the second chamber is 20:1 to 30:1, and can be selected, but is not limited to, 20:1, 23:1, 25:1, 27:1 or 30:1.

[0035] This embodiment also provides a detection method using the detection device of this embodiment, which can perform positive pressure detection and negative pressure detection on the mechanical pneumatic regulating valve to be tested.

[0036] (a) Positive pressure detection

[0037] Step 1: Slowly inflate the chamber using the air compressor / pump.

[0038] Step 2: Observe the gas pressure in chamber 1 according to the reading of pressure gauge 1;

[0039] Step 3: Continuously inflate chamber 1 until the opening pressure of the mechanical air pressure regulating valve is reached. The mechanical air pressure regulating valve opens, and chamber 1 releases pressure to chamber 2. Pressure gauge 2 detects a change in air pressure in chamber 2, and pressure gauge 2 changes. At this time, the mechanical air pressure regulating valve reaches the opening threshold. The reading of pressure gauge 1 is the opening pressure value of the mechanical air pressure regulating valve.

[0040] (ii) Negative pressure detection

[0041] Step 1: Slowly draw air into the chamber using the air compressor / pump;

[0042] Step 2: Observe the gas pressure in chamber 1 according to the reading of pressure gauge 1;

[0043] Step 3: Continuously pump air into chamber 1 until the opening pressure of the mechanical air pressure regulating valve is reached. The mechanical air pressure regulating valve opens, and chamber 2 pressurizes chamber 1. Pressure gauge 2 detects a change in air pressure in chamber 2, and pressure gauge 2 changes. At this time, the mechanical air pressure regulating valve reaches the opening threshold. The reading of pressure gauge 1 is the opening pressure value of the mechanical air pressure regulating valve.

[0044] Example 2: As Figure 1-3 As shown, this embodiment provides a detection device for a mechanical air pressure regulating valve, including a first chamber and a second chamber. An intermediate chamber wall is provided between the first chamber and the second chamber. A mechanical air pressure regulating valve is installed on the intermediate chamber wall. The first chamber is connected to an air compressor / air pump. The first chamber is also connected to a pressure gauge, and the second chamber is connected to a pressure gauge.

[0045] In this embodiment, a cylindrical body 1 is included. The cylindrical body is cylindrical and divided into a lower part and an upper part. The lower part is a first chamber 11, and the upper part is a second chamber 12. The diameter of the lower part of the cylinder is larger than the diameter of the upper part, and the height of the lower part is greater than the height of the upper part. Therefore, the volume of the first chamber is larger than the volume of the second chamber. Preferably, the volume ratio of the first chamber to the second chamber is 20:1 to 30:1, and can be selected, but is not limited to, 20:1, 23:1, 25:1, 27:1, or 30:1.

[0046] As one implementation method in this embodiment, the volume of the second chamber is designed to be 200 cm³. 3 ~300 cm 3 The volume of chamber one is designed to be 20 to 30 times that of chamber two, that is, the volume of chamber two is designed to be 4000 cm³. 3 ~9000cm 3 A smaller volume in chamber two facilitates rapid pressure changes within chamber two, leading to faster readings on pressure gauge two. Designing chamber one to be 20-30 times the volume of chamber two ensures that the internal pressure of chamber two rises and falls slowly during inflation and deflation, facilitating monitoring by pressure gauge two and improving the accuracy of pressure regulation valve opening pressure readings.

[0047] The mechanical pneumatic pressure regulating valve 3 is installed between the upper and lower parts of the cylinder. Furthermore, an openable and closable cap 5 is provided on the top surface of the upper part of the cylinder. In this embodiment, chamber one and chamber two are integrated into a single component and arranged vertically.

[0048] In this embodiment, the air compressor / pump 12 is connected to the lower part of the first chamber via an inflation pipe 11, and a ball valve 10 is installed on the inflation pipe. A pressure gauge 8 is connected to the upper part of the first chamber via a pipe. In this embodiment, the pressure gauge 8 is a digital pressure gauge, which facilitates quick reading of the pressure data within the first chamber.

[0049] A sealing ring 4 is provided between the cylinder cover 5 and the top of the cylinder body to ensure that the second chamber does not leak. An air nozzle 6 is connected to the top of the cylinder cover, and the air nozzle is connected to the pressure gauge 9 via a pressure detection pipe 7. In this embodiment, the pressure gauge is a pointer-type pressure gauge to facilitate quick observation of any changes in pressure within the second chamber.

[0050] In another embodiment of this invention, a flange is provided at the bottom of the cylinder, and a handle 2 is provided on the outer wall of the cylinder. The top surface of the cylinder cover is hexagonal.

[0051] This embodiment also provides a detection method using the detection device of the above-mentioned mechanical pneumatic pressure regulating valve, including the following steps:

[0052] (a): Positive pressure detection

[0053] Step 1: Turn on the air compressor / air pump, open the ball valve, and slowly inflate the chamber to the bottom through the inflation pipe;

[0054] Step 2: Observe the air pressure in chamber 1 in real time according to the reading of pressure gauge 1;

[0055] Step 3: Continuously inflate until the air pressure in chamber one reaches the opening pressure of the mechanical air pressure regulating valve. The mechanical air pressure regulating valve opens to release pressure into chamber two, causing the air pressure in chamber two to increase. Pressure gauge two detects the pressure change in chamber two through the air pressure detection pipeline, which causes the pointer of pressure gauge two to rotate. At this time, the mechanical air pressure regulating valve reaches the opening threshold, and the reading of pressure gauge one is the opening pressure value of the mechanical air pressure regulating valve.

[0056] (II): Negative pressure detection

[0057] Step 1: Turn on the air pump, open the ball valve, and slowly pump air into the bottom of the chamber through the inflation pipe;

[0058] Step 2: Observe the air pressure in chamber 1 in real time according to the reading of pressure gauge 1;

[0059] Step 3: Continuously pump air until the air pressure in chamber one reaches the opening pressure of the mechanical air pressure regulating valve. The mechanical air pressure regulating valve opens, and chamber two pressurizes chamber one, causing the air pressure in chamber two to decrease. Pressure gauge two detects the pressure change in chamber two through the air pressure detection pipeline, which causes the pointer of pressure gauge two to rotate. At this time, the mechanical air pressure regulating valve reaches the opening threshold, and the reading of pressure gauge one is the opening pressure value of the mechanical air pressure regulating valve.

[0060] This invention provides a testing device and method for mechanical pneumatic pressure regulating valves that is simple to operate, has high testing stability, and high testing accuracy. It accurately and efficiently identifies the positive and negative opening pressures of the pneumatic pressure regulating valve without damaging it.

[0061] In this embodiment, the second pressure gauge is a high-sensitivity pointer pressure gauge with a testing range of -30Pa to 30Pa. When the pressure regulating valve is working, the internal pressure of chamber two will change. The pointer of the high-sensitivity pressure gauge will fluctuate according to the different inflation / deflation rates, resulting in different inflation and deflation rates of the pressure regulating valve. When the pressure regulating valve reaches its threshold, the fluctuation of the pointer of the pressure gauge will show rapid or slow changes, eventually reaching its maximum value: 30Pa for positive pressure and -30Pa for negative pressure. The wide range of pointer rotation makes the identification of the opening of the pressure regulating valve more obvious and intuitive.

[0062] Appendix

[0063] Appendix 1 Test Data

[0064]

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made to it without departing from the scope defined by the claims of the present invention.

Claims

1. A detection device for a mechanical pneumatic pressure regulating valve, characterized in that: The device includes two chambers: a first chamber and a second chamber, with an intermediate wall between them. A mechanical pressure regulating valve is installed on the intermediate wall. The first chamber is connected to an air compressor / pump and is also connected to a pressure gauge. The second chamber is connected to a pressure gauge; the first pressure gauge is a digital pressure gauge. The second chamber is located above the first chamber, and its volume is smaller than that of the first chamber, with a volume ratio of 20:1 to 30:

1. The air compressor / pump is connected to the first chamber via an inflation pipe equipped with a ball valve. The device also includes a cylinder, with the first chamber at the bottom and the second chamber at the top. A cap is provided at the top of the cylinder, and a sealing ring is installed between the cap and the top of the cylinder.

2. The detection device for the mechanical pneumatic pressure regulating valve as described in claim 1, characterized in that: The cylinder cover is provided with an air nozzle that communicates with the second chamber. The air nozzle is connected to the second pressure gauge through an air pressure detection pipe.

3. The detection device for the mechanical pneumatic pressure regulating valve as described in claim 1 or 2, characterized in that: Both the lower and upper parts of the cylinder are cylindrical, and the diameter of the lower part of the cylinder is larger than the diameter of the upper part of the cylinder. A handle is also provided on the outer wall of the lower part of the cylinder.

4. A testing method for a testing device for a mechanical pneumatic pressure regulating valve, using the testing device described in any one of claims 1-3, characterized in that, Includes the following steps: (a): Positive pressure detection Step 1: Turn on the air compressor / air pump, open the ball valve, and slowly inflate the chamber through the inflation pipe; Step 2: Observe the air pressure in chamber 1 in real time according to the reading of pressure gauge 1; Step 3: Continuously inflate until the air pressure in chamber one reaches the opening pressure of the mechanical air pressure regulating valve. The mechanical air pressure regulating valve opens to release pressure into chamber two, causing the air pressure in chamber two to increase. Pressure gauge two detects the pressure change in chamber two through the air pressure detection pipeline, which in turn causes the reading of pressure gauge two to change. At this time, the mechanical air pressure regulating valve reaches the opening threshold, and the reading of pressure gauge one is the opening pressure value of the mechanical air pressure regulating valve. (II): Negative pressure detection Step 1: Turn on the air pump, open the ball valve, and slowly pump air into the chamber through the inflation pipe. Step 2: Observe the air pressure in chamber 1 in real time according to the reading of pressure gauge 1; Step 3: Continuously pump air until the air pressure in chamber one reaches the opening pressure of the mechanical air pressure regulating valve. The mechanical air pressure regulating valve opens, and chamber two pressurizes chamber one, causing the air pressure in chamber two to decrease. Pressure gauge two detects the pressure change in chamber two through the air pressure detection pipeline, which in turn causes the reading of pressure gauge two to change. At this time, the mechanical air pressure regulating valve reaches the opening threshold, and the reading of pressure gauge one is the opening pressure value of the mechanical air pressure regulating valve.

5. The detection method as described in claim 4, characterized in that: The test range of the pressure gauge 2 is -30Pa to 30Pa.

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