Flow detection device for small and medium-sized air compressors

Abstract

This invention provides a flow detection device for small and medium-sized air compressors, comprising: a tank assembly including at least two air storage tanks of different volumes for introducing compressed gas output from the air compressor under test; each air storage tank is equipped with a first pressure gauge and a first thermometer; flow stabilizing pipes, arranged in pairs, with one pair per air storage tank, one in use and one as a backup; each flow stabilizing pipe outlet is equipped with an ASME nozzle, and a differential pressure gauge and a second thermometer for detecting the pressure difference and temperature difference at the ASME nozzle outlet; a gas delivery pipeline with two parallel branches, which can be switched via a three-way ball valve connected to the input end, with the outlets connected to the two flow stabilizing pipes respectively, and the inlets connected to the air outlets of the air storage tanks; a second pressure gauge and a third thermometer for detecting ambient air pressure and ambient temperature. This invention can meet the testing requirements of air compressors of different specifications and models, helps control testing costs, simplifies testing operations, and reduces operational difficulty.

Description

Technical Field

[0001] This utility model relates to the field of air compressor testing technology, and more specifically to a flow detection device for small and medium-sized air compressors. Background Technology

[0002] An air compressor is a mechanical device that converts the mechanical energy of an electric motor into the pressure energy of gas. Its core function is to increase gas pressure by compressing air, and then store the compressed high-pressure gas in a tank or deliver it directly to the gas-using equipment to meet the needs of industrial production, daily life, and other fields for power sources or process gases. Air compressors are widely used in many fields such as industry, manufacturing, energy, medical, and food.

[0003] The ASME nozzle is a high-precision flow measurement device that employs a throat-tapping or long-neck nozzle structure. It operates based on the principle of a throttling flow sensor. Its core advantage lies in its unique throat-tapping method, which ensures a stable and highly repeatable discharge coefficient. In other words, the ASME nozzle alters fluid velocity and pressure through a throttling effect, accurately measuring the pressure difference using the throat-tapping method, and then calculating the flow rate using fluid dynamics formulas. ASME nozzle testing technology is commonly used in the testing process of air compressors to evaluate the performance of finished air compressors.

[0004] Because air compressors vary in capacity, power, and size, testing portable air compressors often requires tanks of different capacities and ASME nozzles of different models. Smaller air compressors require smaller tanks and smaller ASME nozzles, while larger air compressors require larger tanks and larger ASME nozzles. This forces air compressor manufacturers to design dedicated testing devices for each type of compressor, resulting in a situation where one testing device corresponds to one type of air compressor. For manufacturers, this leads to a waste of resources; for the market, there is no universally applicable testing device, forcing manufacturers to rely on their own testing methods. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model proposes a more universal flow detection device for small and medium-sized air compressors, which can meet the detection needs of air compressors of different specifications and models, helps control detection costs, simplifies detection operations, and makes detection more convenient while reducing operational difficulty.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A flow detection device for small and medium-sized air compressors, comprising:

[0008] The tank assembly includes at least two gas storage tanks, each with a different volume; each gas storage tank is equipped with a first pressure gauge and a first thermometer for detecting the gas pressure and temperature inside the tank; the gas inlet of the tank is connected to the gas outlet of the air compressor under test through an inlet pipe, and the inlet pipe and the gas inlet of the tank are detachably connected; the compressed gas input into the tank can be delivered to the gas inlets of two matching flow stabilizers through the gas outlet of the tank of the external gas delivery pipeline.

[0009] The flow stabilizers are arranged in pairs, with multiple sets provided. For each gas storage tank, there are two flow stabilizers in a set, one for use and one for backup. The outlet of each flow stabilizer can be detachably fitted with an ASME nozzle. The outlet end of the pipe is equipped with a differential pressure gauge and a second thermometer for detecting the pressure difference and temperature difference at the outlet of the ASME nozzle.

[0010] The gas delivery pipeline has two parallel branches. The input ends of the two branches are detachably connected to the two outlets of the three-way ball valve, and the output ends are detachably connected to the inlets of the two flow stabilizers. A flow stabilizer switch is provided between them. The inlet of the three-way ball valve is detachably connected to the outlet of the gas storage tank.

[0011] The second pressure gauge and the third thermometer are used to detect the ambient air pressure and ambient temperature.

[0012] The structural features of this utility model also lie in:

[0013] In the testing device, a large-capacity gas storage tank is paired with a flow stabilizing pipe with a large-diameter ASME nozzle, while a small-capacity gas storage tank is paired with a flow stabilizing pipe with a small-diameter ASME nozzle.

[0014] The gas storage tanks are divided into two categories: one is a large tank with a volume of 25-50L, and the outlet of the matching flow stabilizer pipe is connected to an ASME nozzle with a diameter of 6.35mm or 9.52mm; the other is a small tank with a volume of 10-20L, and the outlet of the matching flow stabilizer pipe is connected to an ASME nozzle with a diameter of 3.18mm or 4.76mm.

[0015] According to GB / T15487-2015, a flow stabilizing pipe equipped with a 6.35mm diameter ASME nozzle, used with a large tank, is suitable for volumetric flow rates of 0.113-0.226m³. 3 The test of the air compressor with a flow rate of 0.255-0.510 m³ / min is performed. It is equipped with a flow stabilizing pipe and a large tank, using an ASME nozzle with a diameter of 9.52 mm. 3 The test of the air compressor with a flow rate of 0.028-0.075 m³ / min is performed. It is equipped with a flow stabilizing pipe and a small tank, using an ASME nozzle with a diameter of 3.18 mm. 3The test of the air compressor with a flow rate of 0.075-0.113 m³ / min is performed. The flow stabilizing pipe is matched with a small tank and has a 4.76mm diameter ASME nozzle. 3 Testing of air compressors at / min.

[0016] The flow stabilizing pipe runs through the airflow direction and is composed of a rectifier, a perforated plate, and a straight pipe section that can be disassembled and spliced ​​in sequence. The inlet of the rectifier serves as the air inlet of the flow stabilizing pipe, and the outlet of the straight pipe section serves as the air outlet of the flow stabilizing pipe.

[0017] It also includes a touchscreen display for receiving and displaying pressure and temperature values ​​detected by a first pressure gauge, a first thermometer, a second pressure gauge, a second thermometer, and a third thermometer, as well as the differential pressure value detected by a differential pressure gauge. The touchscreen display is also used to turn all the measuring instruments on and off. All instruments and the touchscreen display are electrically connected, and can display real-time instrument count curves and flow rate curves based on the measured values ​​from each instrument. The touchscreen display model is IT7150E and is connected to the control components.

[0018] The system is equipped with an operating platform, which has an upper and lower structure and an operating panel. Multiple air tanks are mounted on the upper platform of the operating platform via tank supports, and multiple flow stabilizers are mounted on the lower platform of the operating platform via pipe supports. The air compressor to be tested is placed on the upper platform, and a touch screen is installed on the operating panel.

[0019] The gas delivery pipeline is detachably connected to the two outlets of the three-way ball valve, the inlet of the three-way ball valve and the outlet of the gas storage tank, and the inlet of the gas delivery pipeline and the flow stabilizer switch via pipes and copper sleeve joints in a threaded manner. The air inlet pipe is detachably connected to the air inlet of the gas storage tank and the air outlet of the air compressor body.

[0020] In the flow stabilizing pipe, the rectifier and the perforated plate, and the perforated plate and the straight pipe section are detachably assembled by bolts via flanges. The inlet of the rectifier and the outlet of the flow stabilizing switch are connected by pipes and copper sleeve joints via threads. The outlet of the straight pipe section and the ASME nozzle are detachably assembled by bolts via flanges.

[0021] Compared with existing technologies, the beneficial effects of this utility model are reflected in:

[0022] This invention overcomes the shortcomings of existing testing devices, such as low versatility and limited applicability. To match air compressor bodies of different specifications and models, it is equipped with air tanks of various volumes, and two flow stabilizing pipes are configured for each volume of air tank. Each flow stabilizing pipe can be fitted with an ASME nozzle of the corresponding diameter. During testing, the pressure and temperature values ​​of the gas in the tank and the differential pressure and temperature values ​​of the gas in the pipe can be detected in real time through the first pressure gauge and the first thermometer of the air tank, and the differential pressure gauge and the second thermometer of the flow stabilizing pipe. The ambient air pressure and ambient temperature are detected through the second pressure gauge and the third thermometer. All detected values ​​are fed back to the touch screen display. The test data can be used to calculate the relevant performance parameters of the air compressor and to conduct an overall evaluation of the air compressor performance. Furthermore, the two flow stabilizing pipes in each group are used and kept on standby, and can be quickly switched through a three-way ball valve. This allows for the sequential testing of two air compressors, making the testing operation more convenient, reducing the difficulty of operation, and helping to control the cost of air compressor testing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0025] Figure 3 This is a schematic diagram of the flow stabilizing tube.

[0026] In the picture:

[0027] 1. The air compressor to be tested;

[0028] 21. Gas storage tank; 211. Gas inlet of tank body; 22. First pressure gauge; 23. First thermometer;

[0029] 31 Flow stabilizer; 311 Rectifier; 312 Perforated plate; 313 Straight pipe section; 32 Flow stabilizer switch; 33 ASME nozzle; 34 Differential pressure gauge; 35 Second thermometer;

[0030] 4. Gas delivery pipeline; 4.1 branch lines; 5. Three-way ball valve;

[0031] 61 Second pressure gauge; 62 Third thermometer;

[0032] 7. Touchscreen display;

[0033] 8. Control panel; 81. Upper control panel; 82. Lower control panel; 83. Control control control panel. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Example 1

[0036] The volumetric flow rate of the air compressor under test is 0.032 m³ / h. 3 / min, the product power is 550W, hereinafter referred to as No. 1 air compressor.

[0037] A small gas storage tank with a volume of 15L is selected, hereinafter referred to as Gas Storage Tank No. 1. The flow stabilizing pipe is equipped with an ASME nozzle with a diameter of 3.18mm, hereinafter referred to as Flow Stabilizing Pipe No. 1.

[0038] During testing:

[0039] Turn on the touch screen, turn on all meters, look up the constant C from the meters, input the constant C into the touch screen and send it back to the control unit, showing the current ambient air pressure value. With ambient temperature value The second pressure gauge detects and sends the feedback to the touch display screen;

[0040] Open the three-way ball valve corresponding to gas tank No. 1, connect the branch of the gas delivery pipeline to the No. 1 flow stabilizer, open the flow stabilizer switch corresponding to the No. 1 flow stabilizer, and keep the other branch of the gas delivery pipeline closed, so that gas tank No. 1 is only connected to the No. 1 flow stabilizer through the gas delivery pipeline.

[0041] Connect the outlet of air compressor No. 1 to the inlet of air tank No. 1 via an inlet pipe. Start air compressor No. 1, and the compressed gas output from air compressor No. 1 will flow into air tank No. 1. The gas pressure inside the tank will... With gas temperature The pressure is detected by the first pressure gauge and the first thermometer, and the results are displayed on the touch screen.

[0042] Compressed gas in gas storage tank No. 1 is introduced into flow stabilizing pipe No. 1 via a branch of the gas delivery pipeline. After being stabilized by a rectifier, it enters the straight pipe section. The gas pressure difference within the straight pipe section... With gas temperature The differential pressure gauge and the third thermometer detect and display the results on the touch screen, while the compressed gas in the flow stabilizing tube is discharged outward through the ASME nozzle;

[0043] Once all values ​​stabilize and no longer fluctuate significantly, record the traffic. .

[0044] According to the "Method for Flow Measurement of Positive Displacement Compressors" (GB / T15487-2015):

[0045]

[0046] In the formula, Where C is the volumetric flow rate of the air compressor, C is a constant (obtained from tables in GB / T15487-2015), and d is the ASME nozzle diameter. The temperature of the gas inside the storage tank. The gas pressure difference within the straight section of the flow stabilizer pipe. The gas temperature within the straight section of the flow stabilizer is... This refers to the ambient air pressure value.

[0047] Example 2

[0048] The volumetric flow rate of the air compressor under test is 0.065 m³ / h. 3 / min, the product power is 950W, hereinafter referred to as No. 2 air compressor.

[0049] A small gas storage tank with a volume of 15L was selected. The No. 1 gas storage tank in Example 1 was still used. The flow stabilizing pipe corresponding to another branch of the gas delivery pipeline in Example 1 was used, and a 4.76mm diameter ASME nozzle was configured. This is referred to as the No. 2 flow stabilizing pipe.

[0050] After the detection operation in Example 1 is completed, the detection in this example will begin:

[0051] Turn on the touch screen, turn on all meters, look up the constant C from the meters, input the constant C into the touch screen and send it back to the control unit, showing the current ambient air pressure value. With ambient temperature value The second pressure gauge detects and sends the feedback to the touch display screen;

[0052] Switch the three-way ball valve corresponding to gas tank No. 2 to connect the branch of the gas delivery pipeline to the No. 2 flow stabilizer pipe, open the flow stabilizer switch corresponding to the No. 2 flow stabilizer pipe, and disconnect the branch of the gas delivery pipeline to the No. 1 flow stabilizer pipe. Keep the flow stabilizer switch of the corresponding flow stabilizer pipe closed, so that gas tank No. 1 is connected to the No. 2 flow stabilizer pipe only through the gas delivery pipeline.

[0053] Connect the outlet of air compressor No. 2 to the inlet of air tank No. 2 via an inlet pipe. Start air compressor No. 2. The compressed gas output from air compressor No. 2 will flow into air tank No. 2. The gas pressure inside the tank will... With gas temperature The pressure is detected by the first pressure gauge and the first thermometer, and the results are displayed on the touch screen.

[0054] Compressed gas in gas storage tank No. 2 is introduced into flow stabilizing pipe No. 2 via a branch of the gas delivery pipeline. After being stabilized by a rectifier, it enters the straight pipe section. The gas pressure difference within the straight pipe section... With gas temperature The differential pressure gauge and the third thermometer detect and display the results on the touch screen, while the compressed gas in the flow stabilizing tube is discharged outward through the ASME nozzle;

[0055] Once all values ​​stabilize and no longer fluctuate significantly, record the traffic. .

[0056] According to the "Method for Flow Measurement of Positive Displacement Compressors" (GB / T15487-2015), it can be known that:

[0057]

[0058] In the formula, Where C is the volumetric flow rate of the air compressor, C is a constant (obtained from tables in GB / T15487-2015), and d is the ASME nozzle diameter. The temperature of the gas inside the storage tank. The gas pressure difference within the straight section of the flow stabilizer pipe. The gas temperature within the straight section of the flow stabilizer is... This refers to the ambient air pressure value.

[0059] Example 3

[0060] The volumetric flow rate of the air compressor under test is 0.12 m³ / s. 3 / min, the product power is 1800W, hereinafter referred to as No. 3 air compressor.

[0061] A large-capacity gas storage tank with a volume of 50L is selected, hereinafter referred to as Gas Storage Tank No. 2. The flow stabilizing pipe is equipped with a 6.53mm diameter ASME nozzle, hereinafter referred to as Flow Stabilizing Pipe No. 3.

[0062] During testing:

[0063] Turn on the touch screen, turn on all meters, look up the constant C from the meters, input the constant C into the touch screen and send it back to the control unit, showing the current ambient air pressure value. With ambient temperature value The second pressure gauge detects and sends the feedback to the touch display screen;

[0064] Open the three-way ball valve corresponding to gas tank No. 2, connect the branch of the gas delivery pipeline to the No. 3 flow stabilizing pipe, open the flow stabilizing switch corresponding to the No. 3 flow stabilizing pipe, and keep the other branch of the gas delivery pipeline closed, so that gas tank No. 2 is only connected to the No. 3 flow stabilizing pipe through the gas delivery pipeline.

[0065] Connect the outlet of air compressor No. 3 to the inlet of air tank No. 2 via an inlet pipe. Start air compressor No. 3. The compressed gas output from air compressor No. 3 will flow into air tank No. 2. The gas pressure inside the tank will... With gas temperature The pressure is detected by the first pressure gauge and the first thermometer, and the results are displayed on the touch screen.

[0066] Compressed gas in storage tank No. 2 is introduced into flow stabilizing pipe No. 3 via a branch of the gas delivery pipeline. After being stabilized by a rectifier, it enters the straight pipe section. The gas pressure difference within the straight pipe section... With gas temperature The differential pressure gauge and the third thermometer detect and display the results on the touch screen, while the compressed gas in the flow stabilizing tube is discharged outward through the ASME nozzle;

[0067] Once all values ​​stabilize and no longer fluctuate significantly, record the traffic. .

[0068] According to the "Method for Flow Measurement of Positive Displacement Compressors" (GB / T15487-2015):

[0069]

[0070] In the formula, Where C is the volumetric flow rate of the air compressor, C is a constant (obtained from tables in GB / T15487-2015), and d is the ASME nozzle diameter. The temperature of the gas inside the storage tank. The gas pressure difference within the straight section of the flow stabilizer pipe. The gas temperature within the straight section of the flow stabilizer is... This refers to the ambient air pressure value.

[0071] Example 4

[0072] The volumetric flow rate of the air compressor under test is 0.25 m³ / s. 3 / min, the product power is 3500W, hereinafter referred to as No. 4 air compressor.

[0073] A large-capacity gas storage tank with a volume of 50L was selected. The No. 2 gas storage tank in Example 3 was used. The flow stabilizing pipe corresponding to another branch of the gas delivery pipeline in Example 3 was used, and a 9.52mm diameter ASME nozzle was configured. This is referred to as the No. 4 flow stabilizing pipe.

[0074] After the detection operation in Example 3 is completed, the detection in this example will begin:

[0075] Turn on the touch screen, turn on all meters, look up the constant C from the meters, input the constant C into the touch screen and send it back to the control unit, showing the current ambient air pressure value. With ambient temperature value The second pressure gauge detects and sends the feedback to the touch display screen;

[0076] Switch the three-way ball valve corresponding to gas tank No. 2 to connect the branch of the gas delivery pipeline to the No. 4 flow stabilizing pipe, open the flow stabilizing switch corresponding to the No. 4 flow stabilizing pipe, and disconnect the branch of the gas delivery pipeline to the No. 3 flow stabilizing pipe. Keep the flow stabilizing switch of the corresponding flow stabilizing pipe closed, so that gas tank No. 2 is connected to the No. 4 flow stabilizing pipe only through the gas delivery pipeline.

[0077] Connect the outlet of air compressor No. 4 to the inlet of air tank No. 2 via an inlet pipe. Start air compressor No. 4, and the compressed gas output from air compressor No. 4 will flow into air tank No. 2. The gas pressure inside the tank will... With gas temperature The pressure is detected by the first pressure gauge and the first thermometer, and the results are displayed on the touch screen.

[0078] Compressed gas in storage tank No. 2 is introduced into flow stabilizing pipe No. 4 via a branch of the gas delivery pipeline. After being stabilized by a rectifier, it enters the straight pipe section. The gas pressure difference within the straight pipe section... With gas temperature The differential pressure gauge and the third thermometer detect and display the results on the touch screen, while the compressed gas in the flow stabilizing tube is discharged outward through the ASME nozzle;

[0079] Once all values ​​stabilize and no longer fluctuate significantly, record the traffic. .

[0080] According to the "Method for Flow Measurement of Positive Displacement Compressors" (GB / T15487-2015), it can be known that:

[0081]

[0082] In the formula, Where C is the volumetric flow rate of the air compressor, C is a constant (obtained from tables in GB / T15487-2015), and d is the ASME nozzle diameter. The temperature of the gas inside the storage tank. The gas pressure difference within the straight section of the flow stabilizer pipe. The gas temperature within the straight section of the flow stabilizer is... This refers to the ambient air pressure value.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flow detection device for small and medium-sized air compressors, characterized in that include: The tank assembly includes at least two gas storage tanks (21), each with a different volume; each gas storage tank (21) is equipped with a first pressure gauge (22) and a first thermometer (23) for detecting the gas pressure and temperature inside the tank; the tank inlet (211) and the outlet of the air compressor (1) under test can be connected by an inlet pipe, and the inlet pipe and the inlet pipe can be detachably connected respectively; the compressed gas input into the tank can be delivered to the inlet of the two matching flow stabilizers (31) through the tank outlet of the external gas delivery pipeline (4); The flow stabilizers (31) are arranged in pairs, and multiple sets are provided. For each gas storage tank (21), the two flow stabilizers (31) in a matching set are used and one is on standby. The outlet of each flow stabilizer (31) can be detachably equipped with an ASME nozzle (33). The outlet end of the pipe is equipped with a differential pressure gauge (34) and a second thermometer (35) for detecting the outlet pressure difference and outlet temperature of the ASME nozzle (33). The gas delivery pipeline (4) is provided with two parallel branches (41). The input ends of the two branches (41) are detachably connected to the two outlets of the three-way ball valve (5), and the output ends are detachably connected to the inlets of the two flow stabilizers (31). A flow stabilizer switch (32) is provided between them. The inlet of the three-way ball valve (5) is detachably connected to the outlet of the gas storage tank (21). The second pressure gauge (61) and the third thermometer (62) are used to detect the ambient air pressure and ambient temperature.

2. The flow rate detecting device for a small or medium-sized air compressor according to claim 1, characterized in that: In the testing device, a large-volume gas storage tank (21) is matched with a flow stabilizing pipe (31) with a large-diameter ASME nozzle (33), and a small-volume gas storage tank (21) is matched with a flow stabilizing pipe (31) with a small-diameter ASME nozzle (33).

3. The flow rate detecting device for a small or medium-sized air compressor according to claim 1 or 2, characterized in that: Each gas storage tank (21) is divided into two categories. One category is a large tank with a volume of 25-50L. The ASME nozzle (33) connected to the outlet of the matching flow stabilizer (31) has a diameter of 6.35mm or 9.52mm. The other category is a small tank with a volume of 10-20L. The ASME nozzle (33) connected to the outlet of the matching flow stabilizer (31) has a diameter of 3.18mm or 4.76mm. A flow stabilizing pipe (31) equipped with a 6.35mm diameter ASME nozzle (33) is used in conjunction with a large tank for volumetric flow rates of 0.113-0.226m³. 3 The test of the air compressor with a flow rate of 0.255-0.510 m³ / min is performed. The flow stabilizing pipe (31) is equipped with an ASME nozzle (33) with a diameter of 9.52 mm and matched with the large tank body. 3 The test of the air compressor with a flow rate of / min is performed. A flow stabilizing pipe (31) with a 3.18mm diameter ASME nozzle (33) is used in conjunction with a small tank for volumetric flow rates of 0.028-0.075m³ / min. 3 The test of the air compressor with a flow rate of / min is performed. A flow stabilizing pipe (31) with an ASME nozzle (33) of 4.76mm diameter is used in conjunction with a small tank for volumetric flow rates of 0.075-0.113m³. 3 Testing of air compressors at / min.

4. The flow rate detecting device for a small or medium-sized air compressor according to claim 1, characterized in that: The flow stabilizer (31) runs through the airflow direction and is composed of a rectifier (311), a perforated plate (312), and a straight pipe section (313) that can be disassembled and spliced ​​in sequence. The inlet of the rectifier (311) serves as the air inlet of the flow stabilizer (31), and the outlet of the straight pipe section (313) serves as the air outlet of the flow stabilizer (31).

5. The flow detecting device for a small or medium-sized air compressor according to claim 1, characterized in that: It also includes a touch screen (7) for receiving and displaying pressure and temperature values ​​detected by a first pressure gauge (22), a first thermometer (23), a second pressure gauge (61), a second thermometer (35), a third thermometer (62), and a differential pressure value detected by a differential pressure gauge (34).

6. The flow detection device for small and medium-sized air compressors according to claim 1 or 5, characterized in that: The operation table (8) is provided with an upper and lower layer structure and an operation panel (83), a plurality of gas storage tanks (21) are respectively arranged on the upper layer table (81) of the operation table (8) through tank body supports, a plurality of steady flow pipes (31) are respectively arranged on the lower layer table (82) of the operation table (8) through pipe body supports, the air compressor (1) to be detected is placed on the upper layer table (81), and the touch display screen (7) is installed on the operation panel (83).

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