A pneumatic test device with freely combinable high and low pressures and its usage method

Abstract

The present invention specifically relates to a pneumatic test device with freely combined high and low pressures. Its characteristics are as follows: it includes a high-pressure air compressor, a low-pressure air compressor, a filter, a differential pressure switch, a direct-reading pressure gauge, a pressure sensor, a flange, and a control box. The high-pressure air compressor and the low-pressure air compressor are connected to the filter in parallel. The filter is also successively connected in series with a direct-reading pressure gauge and a pressure sensor, and a flange is provided at the end. The entire test device is connected to the pipeline to be tested through a flange interface. With the above design, this device solves the difficulty of pressure testing gas pipelines when there is no gas source in a newly built clean room workshop, greatly improves the efficiency of pneumatic work, reduces the construction cost. In particular, the filter design in the device ensures the safe pressure testing of oxygen pipelines in the metallurgical industry. Combining the differential pressure alarm and overload protection in the device, it ensures the safety and reliability of various gas pressure testing works.

Description

Technical Field

[0001] The present invention relates to the field of construction of electronic factories, and specifically to a pneumatic test device with freely combined high and low pressures. Background Art

[0002] In recent years, the construction requirements for gas pipelines in newly built cleanroom factories have become increasingly high. Especially the pressure test of gas pipelines has become a key research object. Since the pipeline pressure in the cleanroom is divided into high and low pressure systems, and due to the long gas pipeline, when using the conventional pressure test method for gas pipelines, a large number of bottled nitrogen gases are often purchased for segmented pressurization. During the pneumatic test, there is pressure loss in the bottled nitrogen gas, the effect of the pneumatic test is not ideal, the waste of bottled nitrogen gas is serious, and the gas pressure test efficiency is low. At the same time, the storage of a large number of bottled nitrogen gases also brings inconvenience and potential safety hazards to the construction site. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above defects and provide a device and method that can ensure the rapid, efficient, and safe pressure test work of gas pipelines in cleanrooms, and at the same time reduce the construction cost.

[0004] To achieve the above purpose, the present invention is implemented as follows:

[0005] A pneumatic test device with freely combined high and low pressures includes a high-pressure air compressor, a low-pressure air compressor, high-pressure ball valves, high-pressure ball valves, a water filter, an oil filter, a particle filter, a differential pressure switch, a direct-reading pressure gauge, a pressure sensor, a flange, a control box, and a drain port; among them, the water filter, the oil filter, and the particle filter are connected in series in sequence. The high-pressure air compressor and the low-pressure air compressor are respectively connected to the control box and are also connected to the water filter in parallel. A high-pressure ball valve is provided between the high-pressure air compressor and the water filter, and a high-pressure ball valve is provided between the low-pressure air compressor and the water filter; the water filter, the oil filter, and the particle filter are all output separately through independent differential pressure switches and are connected to the control box. Moreover, the water filter, the oil filter, and the particle filter are all separately provided with drain ports. After the water filter, the oil filter, and the particle filter are connected in series in sequence, a direct-reading pressure gauge and a pressure sensor are successively connected in series at their ends, and a flange interface is provided at the end; the entire test device is connected to the pipeline to be tested through the flange interface, and the connections between the above-mentioned devices are all made by using rigid or flexible sealed pipelines.

[0006] The usage method of the pneumatic test device with freely combined high and low pressures includes

[0007] Step 1. Determine the appropriate air compressor according to the test pressure: When the required pressure for the gas test is below 4 - 5 MPa, start the high-pressure air compressor, open the high-pressure ball valve, and keep the low-pressure air compressor and the high-pressure ball valve closed; when the required pressure for the gas test is below 0.8 MPa, start the low-pressure air compressor, open the high-pressure ball valve and keep the high-pressure air compressor and the high-pressure ball valve closed.

[0008] Step 2. The pressurized air output by the high-pressure or low-pressure air compressor passes through a water filter, an oil filter, and a particle filter in sequence, and then enters the pipeline to be tested through a flange interface to achieve the purpose of pressure testing. Among them, during high-pressure testing, the low-pressure air compressor is used first at the beginning of pressurization, which not only speeds up the pressure rise but also avoids the wear of the high-pressure air compressor. When the pressure rises to 0.7 Mpa, stop the operation of the low-pressure air compressor through the control box and start the high-pressure air compressor to continue outputting compressed air at the same time. At this time, the high-pressure ball valve should be closed and the high-pressure ball valve should be opened.

[0009] Step 3. Abnormal handling:

[0010] Step 3.1. Differential pressure alarm: When the water filter, oil filter, and particulate filter filter the compressed air output by the air compressor, when the filter element inside the corresponding filter fails, it alarms through the differential pressure switch. At this time, it is prompted to replace the filter element to prevent the filter element from being punctured or other abnormal situations. At the same time, a drain port is designed at the bottom of each filter, which can quickly drain the oil, water, particulate matter or other sundries generated after filtration, avoiding pollution of the clean room workshop when replacing the filter element.

[0011] Step 3.2. Overload protection: By setting three observation elements, namely a differential pressure switch, a direct-reading pressure gauge, and a pressure sensor, when the gas pipeline pressure test exceeds the pressure, the start and stop of the high-pressure or low-pressure air compressor are realized through the control box in a manual or preset threshold manner by these three observation elements, ensuring the safe operation of the gas pressure work.

[0012] For the described high-low pressure freely combined air pressure test device, the control box refers to an industrial control computer, and the alarm thresholds of the differential pressure switch and the pressure sensor are preset in this industrial control computer.

[0013] With the above design, this device solves the difficulty of gas pipeline pressure testing when there is no gas source in a newly built clean room workshop, greatly improves the efficiency of air pressure work, reduces the construction cost. At the same time, this high-low pressure freely combined air pressure test device is not only applicable to gas pipeline pressure testing in industrial workshops, but also applicable to gas pipeline pressure testing in the metallurgical industry. Especially the design of the three groups of filters in the device greatly ensures the safe pressure testing of oxygen pipelines in the metallurgical industry. Combined with the differential pressure alarm and overload protection in the device, it ensures the safe and reliable operation of various gas pressure testing works. Brief Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the device Detailed Description of the Invention

[0015] The following further illustrates the invention through specific embodiments.

[0016] As Figure 1 shown, a pneumatic test device with free combination of high and low pressures includes a high-pressure air compressor 1, a low-pressure air compressor 2, a high-pressure ball valve 3, a low-pressure ball valve 4, a water filter 5, an oil filter 6, a particle filter 7, a differential pressure switch 8, a direct-reading pressure gauge 9, a pressure sensor 10, a flange connection port 11, a control box 12, and a sewage outlet 13; among them, the water filter 5, the oil filter 6, and the particle filter 7 are connected in series in sequence, the high-pressure air compressor 1 and the low-pressure air compressor 2 are respectively connected to the control box 12 and are also connected to the water filter 5 in a parallel manner, a high-pressure ball valve 3 is arranged between the high-pressure air compressor 1 and the water filter 5, and a low-pressure ball valve 4 is arranged between the low-pressure air compressor 2 and the water filter 5; the water filter 5, the oil filter 6, and the particle filter 7 are all output separately through independent differential pressure switches 8 and are connected to the control box 12, and moreover, the water filter 5, the oil filter 6, and the particle filter 7 are all separately provided with sewage outlets 13. After the water filter 5, the oil filter 6, and the particle filter 7 are connected in series in sequence, a direct-reading pressure gauge 9 and a pressure sensor 10 are connected in series in sequence at their ends and a flange interface 11 is arranged at the end; the entire test device is connected to the pipeline to be tested through the flange interface and the connections between the above-mentioned components are all made by using rigid or flexible sealed pipelines.

[0017] The usage method of the pneumatic test device with free combination of high and low pressures includes

[0018] Step 1: Determine the appropriate air compressor according to the test pressure: When the required pressure for the gas test is below 4 - 5 MPa, start the high-pressure air compressor 1, open the high-pressure ball valve 3, and keep the low-pressure air compressor 2 and the low-pressure ball valve 4 closed; when the required pressure for the gas test is below 0.8 MPa, start the low-pressure air compressor 2, open the low-pressure ball valve 4, and keep the high-pressure air compressor 1 and the high-pressure ball valve 3 closed;

[0019] Step 2: The pressurized air output by the high-pressure air compressor 1 or the low-pressure air compressor 2 enters the pipeline to be measured through the flange interface 11 after passing through the water filter 5, the oil filter 6, and the particle filter 7 in sequence, thereby achieving the purpose of pressure testing. Among them, during high-pressure pressure testing, the low-pressure air compressor 2 is used first at the beginning of pressurization, which not only speeds up the pressure increase but also avoids the wear of the high-pressure air compressor 1. When the pressure rises to 0.7 Mpa, the operation of the low-pressure air compressor 2 is stopped through the control box 12 and the high-pressure air compressor 1 is started simultaneously to continue outputting compressed air. At this time, the low-pressure ball valve 4 should be closed and the high-pressure ball valve 3 should be opened.

[0020] Step 3: Abnormal handling:

[0021] Step 3.1: Differential pressure alarm: When the water filter 5, the oil filter 6, and the particle filter 7 filter the compressed air output by the air compressor, when the filter element inside the corresponding filter fails, it alarms through the differential pressure switch 8. At this time, it is prompted to replace the filter element to prevent the filter element from being punctured or other abnormal situations. At the same time, a drain port 13 is designed at the bottom of each filter, which can quickly drain the oil, water, particulate matter or other sundries generated after filtration, avoiding the pollution of the clean room workshop when replacing the filter element.

[0022] Step 3.2: Overload protection: By setting three observation elements, namely the differential pressure switch 8, the direct-reading pressure gauge 9, and the pressure sensor 10, when the gas pipeline pressure test exceeds the pressure, the start and stop of the high-pressure air compressor 1 or the low-pressure air compressor 2 are realized through the control box in a manual or preset threshold manner by these three observation elements, ensuring the safe operation of the gas pressure work.

[0023] For the described air pressure test device with high and low pressure freely combined, the control box 12 refers to an industrial control computer, and the alarm thresholds of the differential pressure switch 8 and the pressure sensor 10 are preset in this industrial control computer.

[0024] With the above design, this device solves the difficulty of gas pipeline pressure testing when there is no gas source in a newly built clean room workshop, greatly improves the efficiency of air pressure work, reduces the construction cost. At the same time, this high and low pressure freely combined air pressure test device is not only applicable to the gas pipeline pressure testing of industrial workshops but also applicable to the gas pipeline pressure testing of the metallurgical industry. Especially the design of the three groups of filters in the device greatly ensures the safe pressure testing of oxygen pipelines in the metallurgical industry. Combined with the differential pressure alarm and overload protection in the device, it ensures the safe and reliable pressure testing of various gases.

Claims

1. A pneumatic test device with freely combinable high and low pressures, characterized in that: It includes a high-pressure air compressor (1), a low-pressure air compressor (2), a high-pressure ball valve (3), a low-pressure ball valve (4), a water filter (5), an oil filter (6), a particle filter (7), a differential pressure switch (8), a direct-reading pressure gauge (9), a pressure sensor (10), a flange interface (11), a control box (12), and a drain port (13); among them, the water filter (5), the oil filter (6), and the particle filter (7) are connected in series in sequence. The high-pressure air compressor (1) and the low-pressure air compressor (2) are respectively connected to the control box (12) and are also connected to the water filter (5) in parallel. A high-pressure ball valve (3) is provided between the high-pressure air compressor (1) and the water filter (5), and a high-pressure ball valve (3) is provided between the low-pressure air compressor (2) and the water filter (5); the water filter (5), the oil filter (6), and the particle filter (7) are all output separately through independent differential pressure switches (8) and are connected to the control box (12). Moreover, the water filter (5), the oil filter (6), and the particle filter (7) are all separately provided with drain ports (13). After the water filter (5), the oil filter (6), and the particle filter (7) are connected in series in sequence, a direct-reading pressure gauge (9) and a pressure sensor (10) are connected in series in sequence at their ends, and a flange interface (11) is provided at the end; the entire test device is connected to the pipeline under test through the flange interface, and the connections between the above-mentioned components are all made using rigid or flexible sealed pipelines.

2. The air pressure test device with freely combinable high and low pressures according to claim 1, characterized in that: The control box (12) refers to an industrial control computer, and alarm thresholds of the differential pressure switch (8) and the pressure sensor (10) are preset in the industrial control computer.

3. The usage method of the pneumatic test device with freely combinable high and low pressures as described in claim 1, characterized in that: including Step 1: Determine the appropriate air compressor according to the test pressure: When the required pressure for the gas test is below 4 - 5 MPa, start the high-pressure air compressor (1), open the high-pressure ball valve (3), and keep the low-pressure air compressor (2) and the low-pressure ball valve (4) closed; when the required pressure for the gas test is below 0.8 MPa, start the low-pressure air compressor (2), open the low-pressure ball valve (4), and keep the high-pressure air compressor (1) and the high-pressure ball valve (3) closed. Step 2: The pressurized air output by the high-pressure air compressor (1) or the low-pressure air compressor (2) enters the pipeline under test through the flange interface (11) after passing through the water filter (5), the oil filter (6), and the particle filter (7) in sequence, so as to achieve the purpose of pressure testing; among them, during high-pressure testing, the low-pressure air compressor (2) is used first at the beginning of pressurization, which can not only accelerate the pressure rise but also avoid the wear of the high-pressure air compressor (1). When the pressure rises to 0.7 Mpa, stop the operation of the low-pressure air compressor (2) through the control box (12) and start the high-pressure air compressor (1) to continue outputting compressed air at the same time. At this time, the low-pressure ball valve (4) should be closed and the high-pressure ball valve (3) should be opened. Step 3: Abnormal handling: Step 3.1, differential pressure alarm: When the water filter (5), oil filter (6), and particle filter (7) filter the compressed air output by the air compressor, when the filter element inside the corresponding filter fails, it alarms through the differential pressure switch (8). At this time, it is prompted to replace the filter element to prevent the filter element from being punctured or other abnormal situations. At the same time, a drain port (13) is designed at the bottom of each filter, which can quickly drain the oil, water, particles or other sundries generated after filtration, avoiding contamination of the clean room workshop when replacing the filter element; Step 3.2, overload protection: By setting three observation elements, namely the differential pressure switch (8), direct-reading pressure gauge (9), and pressure sensor (10), when the gas pipeline is pressure-tested and overpressure occurs, through these three observation elements, the start and stop of the high-pressure air compressor (1) or low-pressure air compressor (2) are realized through the control box manually or by presetting the threshold value, ensuring the safe operation of the gas pressure.

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