A rotary valve test device

Abstract

The present invention relates to a rotary valve testing device, which includes a computer integrated control device and a support table. A bracket is erected on the support table, and a telescopic device is installed at the top of the bracket. The bottom end of the telescopic device is a telescopic end and is coaxially installed with a sealing cover. A base is installed on the support table below the sealing cover. The base is a housing structure with an open top surface, and a first flange is coaxially installed at the open position of the top surface of the base. The base is connected to a gas source device through an air inlet pipe. A first gas flowmeter and a pressure sensor are sequentially installed on the air inlet pipe. The first gas flowmeter is arranged close to the gas source device. The computer integrated control device is respectively in signal connection with the gas source device, the first gas flowmeter, and the pressure sensor. When testing the airtightness of the rotary valve, the test results obtained by the present invention, compared with the prior art, are not based on assumptions under ideal conditions, so as to reduce the deviation between the test results and the actual situation and improve the accuracy of the test results.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotary valve testing, and particularly relates to a rotary valve testing device. Background Art

[0002] Currently, when testing whether an industrial valve leaks air, some use simulation technology to establish a mathematical model to simulate the air leakage characteristics of a rotary valve during pneumatic conveying. However, when using the above testing method, since it relies on a mathematical model, it is impossible to capture the complexity and variables encountered during the actual operation of the rotary valve. That is, the test results of the above testing method are based on assumptions under ideal conditions, which will cause a deviation between the test results and the actual situation. Therefore, there are still drawbacks and deficiencies in the prior art. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotary valve testing device to solve the problems raised in the above background art.

[0004] The technical solution adopted by the present invention to solve the above problems:

[0005] A rotary valve testing device includes a computer integrated control device and a support table. A bracket is erected on the support table, and a vertically distributed telescopic device is installed at the top of the bracket. The bottom end of the telescopic device is a telescopic end and is coaxially installed with a sealing cover. A base is installed on the support table below the sealing cover. The base is a housing structure with an open top surface, and a first flange is coaxially installed at the open position of the top surface of the base. A gas source device is connected to the base through an air inlet pipe. A first gas flowmeter and a pressure sensor are sequentially installed on the air inlet pipe. The first gas flowmeter is arranged close to the gas source device. The computer integrated control device is respectively in signal connection with the gas source device, the first gas flowmeter, and the pressure sensor.

[0006] Furthermore, the base is slidably connected to the support table to form a movable base, and a first connecting pipe is connected to the base. One end of the first connecting pipe away from the base is connected to the air inlet pipe through a first gas transmission hose.

[0007] Furthermore, it further includes a vertically distributed exhaust hopper. The bottom surface of the exhaust hopper is open, and a second flange is coaxially installed at the open position of the bottom surface of the exhaust hopper. The top of the exhaust hopper is connected to an exhaust pipe, and a second gas flowmeter in signal connection with the computer integrated control device is connected to the exhaust pipe.

[0008] Further, a blanking tank is coaxially connected to the top of the exhaust hopper. A first switching valve is installed at the bottom of the blanking tank. The first connecting pipe is a horizontally arranged inverted T-shaped pipe. The vertical pipe of the inverted T-shaped pipe is coaxially arranged with the base. One end of the horizontal pipe of the inverted T-shaped pipe is connected to the first gas transmission hose, and the other end of the horizontal pipe of the inverted T-shaped pipe is connected to a material transmission hose. The end of the material transmission hose far from the first connecting pipe is connected to a material transmission pipe with a second switching valve. The end of the material transmission pipe far from the material transmission hose is connected to a storage bin, and a third gas flowmeter signal-connected to the computer integrated control device is connected to the material transmission pipe.

[0009] Further, air jet devices are connected between both sides of the base and the horizontal pipe of the inverted T-shaped pipe. Each air jet device includes an air jet pipe. The two ends of the air jet pipe are respectively connected to the base and the horizontal pipe of the inverted T-shaped pipe, and an automatic switching valve signal-connected to the computer integrated control device is installed on each air jet pipe.

[0010] Further, a gas flow control unit is connected to the intake pipeline between the pressure sensor and the first gas transmission hose. The gas flow control unit is signal-connected to the computer integrated control device. The gas flow control unit includes a second connecting pipe with both ends open. Both ends of the second connecting pipe are connected to the intake pipeline. A Laval nozzle is connected between one end of the second connecting pipe and the intake pipeline. A safety valve, a contact pressure gauge, and a pressure transmitter are sequentially installed on the second connecting pipe. The pressure transmitter is arranged close to the Laval nozzle, and the Laval nozzle is arranged close to the first gas transmission hose. A third connecting pipe is arranged on one side of the second connecting pipe. Both ends of the third connecting pipe are respectively connected to the second connecting pipe on both sides of the contact pressure gauge, and a pneumatic valve positioner is installed on the third connecting pipe.

[0011] Further, the first flange is detachably and fixedly connected to the base, and the second flange is detachably and fixedly connected to the exhaust hopper.

[0012] Further, a pressure regulating device is connected to the intake pipeline between the first gas flowmeter and the pressure sensor. The pressure regulating device is signal-connected to the computer integrated control device. The pressure regulating device includes three branch pipes arranged side by side. Both ends of the branch pipes are connected to the intake pipeline. The three branch pipes are respectively a first branch pipe, a second branch pipe, and a third branch pipe. A third switching valve is installed on the first branch pipe. Two fourth switching valves are installed on the second branch pipe. A medium-pressure pressure reducing valve is installed on the second branch pipe between the two fourth switching valves. Two fifth switching valves are installed on the third branch pipe. A low-pressure pressure reducing valve is installed on the third branch pipe between the two fifth switching valves.

[0013] Further, a temperature sensor is installed on the intake pipeline between the pressure sensor and the first gas transmission hose, and the temperature sensor is signal-connected to the computer integrated control device.

[0014] Further, the gas source device includes an air compressor, the air compressor is communicated with an air receiver through a second gas transmission hose, one end of the intake pipeline far from the base is connected to the air receiver, and a filter pressure reducing valve is installed at one end of the intake pipeline close to the air receiver.

[0015] Adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0016] Before the test of the present invention, through the first flange installed on the base, the flange at the bottom of the rotary valve body can be connected to the first flange through a bolt connection pair, so that the rotary valve can be installed on the base; during the test, when the telescopic end of the telescopic device extends, the sealing cover can be pressed against the flange at the top of the rotary valve body to seal the top opening of the rotary valve. Then, when the gas source device is started, gas can be supplied into the rotary valve through the gas transmission pipeline and the base, and the gas supply continues for a period of time. Since the pressure sensor can detect the pressure in the gas transmission channel in real time, the computer integrated control device can be used to judge whether the rotary valve is filled with gas. Then, when the rotary valve is filled with gas, the gas source device can be stopped by the computer integrated control device. At this time, if the flow value of the first gas flowmeter collected by the computer integrated control device does not change subsequently, it indicates that there is no air leakage in the whole machine shell of the rotary valve; on the contrary, it indicates that there is an air leakage phenomenon in the whole machine shell of the rotary valve. When the airtightness of the whole machine shell of the rotary valve is unqualified, the air leakage amount of the rotary valve in the static state can also be tested. That is, by using the present invention, the rotary valve can be directly tested. In this way, when testing the airtightness of the rotary valve, the obtained test result is not based on the assumption under the ideal state compared with the prior art, so as to reduce the deviation between the test result and the actual situation and improve the accuracy of the test result. Description of the Drawings

[0017] Figure 1 is one of the structural schematic diagrams of the present invention;

[0018] Figure 2 is Figure 1 the structural schematic diagram of part of the devices in

[0019] Figure 3 is the second structural schematic diagram of the present invention;

[0020] Figure 4 is Figure 3 the structural schematic diagram of part of the devices in

[0021] Figure 5Schematic structural diagram of the gas flow control unit of the present invention;

[0022] Figure 6 Schematic structural diagram of the pressure regulating device of the present invention;

[0023] Figure 7 Schematic structural diagram of part of the device of the present invention;

[0024] Figure 8 Flow chart for testing the air leakage amount of the rotary valve under load state in the present invention

[0025] Figure 9 Schematic structural diagram of the rotary valve in the prior art.

[0026] Reference numerals: 1, base; 2, telescopic device; 3, gas source device; 31, air compressor; 32, second gas transmission hose; 33, air receiver; 34, filter pressure reducing valve; 4, gas flow control unit; 41, second connecting pipe; 42, Laval nozzle; 43, safety valve; 44, contact pressure gauge; 45, pressure transmitter; 46, third connecting pipe; 47, pneumatic valve positioner; 5, pressure regulating device; 51, first branch pipe; 52, second branch pipe; 53, third branch pipe; 54, third switching valve; 55, fourth switching valve; 56, medium pressure reducing valve; 57, fifth switching valve; 58, low pressure reducing valve; 6, jet device; 61, jet pipe; 62, automatic switching valve; 7, support platform; 8, rotary valve; 81, rotary valve body; 82, end cover; 83, rotating shaft; 84, motor; 85, flange; 9, exhaust hopper; 10, blanking tank; 11, computer integrated control device; 12, bracket; 13, first flange; 14, intake pipeline; 15, first gas flowmeter; 16, pressure sensor; 17, track; 18, carrier trolley; 19, first connecting pipe; 20, first gas transmission hose; 21, second flange; 22, exhaust pipe; 23, second gas flowmeter; 24, first switching valve; 25, feeding hose; 26, second switching valve; 27, feeding pipe; 28, storage bin; 29, third gas flowmeter; 30, temperature sensor. Detailed implementation manners

[0027] To make the objectives, technical solutions and beneficial effects of the present invention clearer, the following further describes the implementation manners of the present invention in detail with reference to the accompanying drawings.

[0028] As Figures 1 to 7 shown, the present invention provides a rotary valve testing device, which can be used to test whether the whole machine housing of the rotary valve 8 as Figure 9 shown leaks air, and can also test the air leakage amount at the shaft seal and end face of the rotary valve 8; and the end face of the rotary valve 8 is the position where the circumferential direction of the end cover 82 is connected to the rotary valve body 81, that is, as Figure 9The position at B shown; the shaft seal of the rotary valve 8 is the position where the circumference of the rotating shaft 83 contacts the end cover 82, that is, the position at A as shown in Figure 9 shown. When the rotary valve 8 is in use, the feeding inside the rotary valve 8 is controlled by the rotation of the rotating shaft 83. There will be a gap at the contact position between the rotating shaft 83 and the end cover 82. Therefore, the shaft seal of the rotary valve 8 is the main air leakage position.

[0029] The present invention includes a computer integrated control device 11 and a support platform 7. The computer integrated control device 11 includes a host, a display screen, etc., and can control the start and stop of each electrical component and monitor and collect the detection data of each electrical component in real time, and can form a data report; and parameter values can also be input into the computer integrated control device 11; a bracket 12 is erected on the support platform 7, and a vertically distributed telescopic device 2 is installed at the top of the bracket 12. The telescopic device 2 can be set as a jack, a hydraulic cylinder, etc.; the bottom end of the telescopic device 2 is a telescopic end and is coaxially installed with a sealing cover. The outer diameter of the sealing cover is larger than the outer diameter of the flange 85 located at the top of the rotary valve body 81; a base 1 is installed on the support platform 7 below the sealing cover. The base 1 is a housing structure with an open top surface, and a first flange 13 is coaxially installed at the open position of the top surface of the base 1. The first flange 13 is adapted to the flange 85 located at the bottom of the rotary valve body 81; a gas source device 3 is connected to the base 1 through an air inlet pipe 14. The gas source device 3 is the power source of the gas; a first gas flowmeter 15 and a pressure sensor 16 are sequentially installed on the air inlet pipe 14. The first gas flowmeter 15 is arranged close to the gas source device 3, and the first gas flowmeter 15 can detect the gas flow in the gas transmission channel in real time; the pressure sensor 16 can detect the pressure in the gas transmission channel in real time; the computer integrated control device 11 is respectively connected to the gas source device 3, the first gas flowmeter 15, and the pressure sensor 16 in signal.

[0030] Specifically, before the test, through the first flange 13 installed on the base 1, the flange 85 at the bottom of the rotary valve body 81 can be connected to the first flange 13 through a bolt connection pair, so that the rotary valve 8 can be installed on the base 1, and a rubber sealing ring can be set at the connection position between the first flange 13 and the flange 85 to improve the sealing performance; during the test, when the telescopic end of the telescopic device 2 extends, the sealing cover can be pressed against the flange 85 at the top of the rotary valve body 81 to seal the top opening of the rotary valve 8. Then, after starting the gas source device 3, gas can be supplied into the rotary valve 8 through the air inlet pipe 14 and the base 1, and the gas supply continues for a period of time, such as not less than five minutes. Since the pressure sensor 16 can detect the pressure in the gas supply channel in real time, the computer integrated control device 11 can be used to judge whether the rotary valve 8 is filled with gas. Then, when the rotary valve 8 is filled with gas, the gas source device 3 can be stopped through the computer integrated control device 11. At this time, if the computer integrated control device 11 subsequently collects that the flow rate value of the first gas flowmeter 15 has not changed, it indicates that there is no air leakage in the whole machine housing of the rotary valve 8 in the static state. On the contrary, it indicates that there is an air leakage phenomenon in the whole machine housing of the rotary valve 8.

[0031] When the airtightness of the whole machine housing of the rotary valve 8 is unqualified, the end cover 82 of the rotary valve 8 to be tested can be sealed with a sealing film. Since there is only one factor affecting the gas volume change, namely air leakage, in the static state of the rotary valve 8, the computer integrated control device 11 can collect the fluctuating gas volume value on the first gas flowmeter 15 to judge whether there is air leakage at the shaft seal of the rotary valve 8 and record the air leakage amount data per unit time. This air leakage amount value is the air leakage amount value at the shaft seal; then, remove the sealing film at the end cover 82, and the remaining operations are the same as those for testing the air leakage amount at the shaft seal. At this time, the change in the gas volume data on the first gas flowmeter 15 is the total air leakage amount value, and the air leakage amount value at the end face is the total air leakage amount value minus the air leakage amount value at the shaft seal. In addition, the shaft seal of the rotary valve 8 in the static state can also be sealed with a sealing film. At this time, the change in the gas volume data on the first gas flowmeter 15 is the air leakage amount value at the end face, so that the air leakage amount of the rotary valve 8 in the static state can be tested; that is, by using the present invention, the rotary valve 8 can be directly tested. In this way, when testing the airtightness of the rotary valve 8, the test result obtained is not based on the assumption under the ideal state compared with the prior art, so that the deviation between the test result and the actual situation can be reduced to improve the accuracy of the test result; in addition, during the production of the rotary valve 8, after testing the airtightness of the whole machine housing of the rotary valve 8, the motor 84 can be finally installed on the rotary valve 8 to reduce unnecessary processes.

[0032] Further, as Figure 1 With Figure 3As shown in the figure, the base 1 is slidably connected to the support platform 7 to form a movable base. Specifically, the horizontal cross-section of the support platform 7 is rectangular, and two tracks 17 parallel to the length direction of the support platform 7 are installed on the surface of the support platform 7. A carrying trolley 18 with a braking function is slidably connected between the two tracks 17, that is, the carrying trolley 18 can be fixed at any position on the support platform 7, and the base 1 is installed on the carrying trolley 18; and a first connecting pipe 19 is communicated with the base 1, and a first gas transmission hose 20 is communicated between one end of the first connecting pipe 19 away from the base 1 and the intake pipe 14. The first gas transmission hose 20 is telescopic, that is, it can change its length arbitrarily; and by setting the first gas transmission hose 20, it can prevent the intake pipe 14 from hindering the horizontal movement of the base 1. In addition, both ends of the first gas transmission hose 20 are connected to the first connecting pipe 19 and the intake pipe 14 through quick connectors respectively, so that it is convenient to disassemble and assemble the first gas transmission hose 20 between the first connecting pipe 19 and the intake pipe 14. At the same time, the airtightness of the connection position between the first gas transmission hose 20 and the first connecting pipe 19 and the intake pipe 14 can be ensured; specifically, when in use, when disassembling and assembling the rotary valve 8 on the base 1, the position of the base 1 can be moved horizontally to misalign the bracket 12 with the base 1, so as to facilitate the disassembly and assembly of the rotary valve 8 on the base 1.

[0033] Alternatively, the base 1 can also be fixedly erected on the support platform 7, and two chutes parallel to the length direction of the support platform 7 are opened on the surface of the support platform 7. The bracket 12 can be set as a portal frame, and sliders slidably connected to the chutes are installed on both sides of the bottom of the bracket 12 to make the bracket 12 slidably connected to the support platform 7. In this way, when in use, by moving the position of the bracket 12, the telescopic device 2 and the sealing cover can be moved to directly above the center of the rotary valve 8. At this time, when disassembling and assembling the rotary valve 8 on the base 1, the bracket 12 can be moved away to misalign the bracket 12 with the base 1, which can also facilitate the disassembly and assembly of the rotary valve 8 on the base 1.

[0034] In addition, for the rotary valve 8 that has passed the airtightness test of the housing, after the bracket 12 is misaligned with the base 1, the hand can be inserted into the rotary valve 8 to rotate the rotating shaft 83 to detect whether the rotating shaft 83 can operate normally. Then, after starting the motor 84 to make the rotary valve 8 operate for a period of time, such as more than 3 hours, observe whether there are abnormal phenomena such as vibration and noise in the rotary valve 8 during this period to test the operation condition of the rotary valve 8.

[0035] Further, as Figure 3As shown in the figure, the present invention further includes a vertically distributed exhaust hopper 9. The bottom surface of the exhaust hopper 9 is provided with an opening, and a second flange 21 is coaxially installed at the opening position of the bottom surface of the exhaust hopper 9. The second flange 21 is adapted to the flange 85 located at the top of the rotary valve body 81. The top of the exhaust hopper 9 is connected to an exhaust pipe 22, and a second gas flowmeter 23 signal-connected to the computer integrated control device 11 is connected to the exhaust pipe 22. The second gas flowmeter 23 can detect the gas flow in the exhaust pipe 22 in real time. Specifically, when the operation of the rotary valve 8 is normal, the second flange 21 and the flange 85 located at the top of the rotary valve body 81 can be connected by a bolt connection pair, so that the exhaust hopper 9 can be installed on the rotary valve 8, and a rubber sealing ring can be provided at the connection position between the second flange 21 and the flange 85 to improve the sealing performance. By providing the exhaust hopper 9, the exhaust pipe 22 and the second gas flowmeter 23, the air leakage amount of the rotary valve 8 in the no-load state can be tested.

[0036] Specifically, in the no-load state, when testing the air leakage amount at the shaft seal of the rotary valve 8, it is also necessary to seal the end cover 82 with a sealing film. Since the rotating shaft 83 of the rotary valve 8 is always rotating, when the gas source device 3 continuously intakes air, the gas filled inside the rotary valve 8 will be discharged through the connected pipeline, that is, the exhaust pipe 22. Then, when the test system runs for a period of time and tends to be stable, the computer integrated control device 11 can collect the value of the gas discharged in the exhaust pipe 22 per unit time recorded in real time on the second gas flowmeter 23. Then, the difference between the intake air volume per unit time recorded on the first gas flowmeter 15 can reflect the true value of the air leakage amount at the shaft seal of the rotary valve 8 in the no-load state. The air leakage amount test at the end face in the no-load state is the same as that at the shaft seal, but the sealing film for sealing the end cover 82 needs to be removed. At this time, the change in the gas volume data recorded on the second gas flowmeter 23 is the total air leakage amount value, and the air leakage amount value at the end face is the total air leakage amount value minus the air leakage amount value at the shaft seal, that is, the present invention can test the air leakage amount of the rotary valve 8 in the no-load state.

[0037] Further, as Figure 3 And Figure 6As shown in the figure, the top of the exhaust hopper 9 is coaxially connected to a blanking tank 10. A first on-off valve 24 is installed at the bottom of the blanking tank 10. The first on-off valve 24 is a pneumatic butterfly valve and is signal-connected to the computer integrated control device 11. During use, the first on-off valve 24 can be used to open and close the blanking channel of the blanking tank 10, and the first on-off valve 24 can be controlled by the computer integrated control device 11. In this way, according to the test requirements, the first on-off valve 24 can be opened in real time, and then the material can automatically fall into the rotary valve 8 through the exhaust hopper 9. Until a certain amount of material is filled in the rotary valve 8, for example, when the rotary valve 8 is filled with material, the first on-off valve 24 is closed. The first connecting pipe 19 is a horizontally arranged inverted T-shaped pipe. The vertical pipe of the inverted T-shaped pipe is coaxially arranged with the base 1. Specifically, the base 1 can be set as a conical structure with a wide top and a narrow bottom. After the vertical pipe of the inverted T-shaped pipe passes through the carrying trolley 18 through a through hole opened on the carrying trolley 18, it is then connected to the base 1.

[0038] One end of the horizontal pipe of the inverted T-shaped pipe is connected to the first gas transmission hose 20, and the other end of the horizontal pipe of the inverted T-shaped pipe is connected to a feeding hose 25. The feeding hose 25 is telescopic. The end of the feeding hose 25 far from the first connecting pipe 19 is connected to a feeding pipe 27 with a second on-off valve 26. The second on-off valve 26 is used to open and close the feeding channel in the feeding pipe 27. By setting the feeding hose 25, it can prevent the feeding pipe 27 from hindering the movement of the base 1 in the horizontal direction. In addition, both ends of the feeding hose 25 are respectively connected to the first connecting pipe 19 and the feeding pipe 27 through quick connectors, which can facilitate the disassembly and assembly of the feeding hose 25 between the first connecting pipe 19 and the feeding pipe 27. At the same time, it can ensure the airtightness of the connection positions of the feeding hose 25 with the first connecting pipe 19 and the feeding pipe 27.

[0039] In addition, the end of the feeding pipe 27 far from the feeding hose 25 is connected to a storage bin 28, and a third gas flowmeter 29 signal-connected to the computer integrated control device 11 is connected to the feeding pipe 27. The third gas flowmeter 29 can detect the gas flow in the feeding pipe 27 in real time. At this time, when the air leakage of the rotary valve 8 in the no-load state is qualified, the air leakage of the rotary valve 8 in the load state can be tested.

[0040] Specifically, open the first switch valve 24 until a certain amount of material is contained in the rotary valve 8, then close the first switch valve 24 to make the rotary valve 8 in a loaded state. In the loaded state, when testing the air leakage at the shaft seal of the rotary valve 8, it is also necessary to seal the end cover 82 with a sealing film. Then, when the rotating shaft 83 rotates driven by the motor 84, the material can fall into the first connecting pipe 19. Then, under the action of the air source device 3, the material can enter the storage bin 28 through the feeding pipe 27 to reproduce the actual working condition of conveying materials to the rotary valve 8. Then, when the test system runs for a period of time and tends to be stable, the computer integrated control device 11 can collect the value of the gas discharged from the feeding pipe 27 per unit time recorded in real time on the third gas flowmeter 29, and collect the value of the gas discharged from the exhaust pipe 22 per unit time recorded in real time on the second gas flowmeter 23. Then, after adding the values of the third gas flowmeter 29 and the second gas flowmeter 23, the difference from the intake air volume per unit time recorded on the first gas flowmeter 15 can reflect the true value of the air leakage at the shaft seal of the rotary valve 8 in the loaded state. The air leakage test at the end face in the loaded state is the same as the air leakage test at the shaft seal, but the sealing film for sealing the end cover 82 needs to be removed. At this time, the sum of the changes in the gas volume data recorded by the second gas flowmeter 23 and the third gas flowmeter 29 is the total air leakage value, and the air leakage value at the end face is the total air leakage value minus the air leakage value at the shaft seal, that is, the present invention can test the air leakage of the rotary valve 8 in the loaded state.

[0041] In addition, the computer integrated control device 11 is equipped with a PWM generator, and the interval time for the computer integrated control device 11 to collect data can be set to 100 milliseconds, that is, the computer integrated control device 11 outputs a data result every 100 milliseconds, and then the average value can be taken to ensure the efficiency and accuracy of data collection. When in use, as Figure 8 shown, the PWM generator of the computer integrated control device 11 can be signal-connected to the control box on the rotary valve 8 through a signal line. Then, the test program in the computer integrated control device 11 sends a test instruction; the PWM generator receives the instruction; then the computer integrated control device 11 controls and adjusts the duty cycle parameter of the PWM generator; the rotation speed of the motor 84 on the rotary valve 8 is controlled by the duty cycle and smooth start and stop are achieved; by changing the rotation speed frequency of the motor 84, the feeding amount of the rotary valve 8 in the loaded state can be adjusted; the computer integrated control device 11 collects the flow numerical signal every 100 ms and calculates the difference and outputs it as the air leakage amount; finally, the air leakage amount numerical report of the rotary valve 8 under different feeding amounts is output. In addition, the rotation direction of the rotating shaft 83 on the rotary valve 8 can also be automatically adjusted in real time by the computer integrated control device 11.

[0042] Furthermore, as Figure 4As shown in the figure, jet devices 6 are connected between both sides of the base 1 and the horizontal pipe of the inverted T-shaped pipe. The jet device 6 includes a jet pipe 61. Both ends of the jet pipe 61 are respectively connected and communicated with the base 1 and the horizontal pipe of the inverted T-shaped pipe. And automatic on-off valves 62 signal-connected to the computer integrated control device 11 are installed on the jet pipe 61. The automatic on-off valve 62 can be used to automatically open and close the jet channel in the jet pipe 61. Specifically, during use, the computer integrated control device 11 can control the automatic on-off valve 62 to start and stop at intervals. In this way, under the action of the air source device 3, the base 1 can be jet-aired at intervals to generate a vibrating with a frequency, so as to facilitate the discharging of the viscous material attached to the base 1, avoid the phenomenon of pipe blockage, and thus be applicable to the discharging of materials with different characteristics.

[0043] Under the load state, when testing the air leakage of the rotary valve 8, it is necessary to consider the actual discharging situation of the rotary valve 8, that is, when the air flow rate is greater than a certain value, problems such as difficult discharging will occur, and the measured air leakage value will not conform to the actual situation. Therefore, as Figure 1 、 Figure 3 and Figure 5 shown in the figure, a gas flow control unit 4 is connected and communicated with the intake pipe 14 between the pressure sensor 16 and the first gas transmission hose 20. The gas flow control unit 4 is signal-connected to the computer integrated control device 11, and the gas flow control unit 4 can adjust the gas flow rate; the gas flow control unit 4 includes a second connecting pipe 41 with both ends open. Both ends of the second connecting pipe 41 are connected and communicated with the intake pipe 14. And a Laval nozzle 42 is connected and communicated between one end of the second connecting pipe 41 and the intake pipe 14. A safety valve 43, a contact pressure gauge 44 and a pressure transmitter 45 are sequentially installed on the second connecting pipe 41. The pressure transmitter 45 is arranged close to the Laval nozzle 42, and the Laval nozzle 42 is arranged close to the first gas transmission hose 20; a third connecting pipe 46 is also arranged on one side of the second connecting pipe 41. Both ends of the third connecting pipe 46 are respectively connected and communicated with the second connecting pipe 41 on both sides of the contact pressure gauge 44. And a pneumatic valve positioner 47 is installed on the third connecting pipe 46. The pneumatic valve positioner 47 is a linear I / P positioner, and the pneumatic valve positioner 47, the safety valve 43, the contact pressure gauge � and the pressure transmitter 45 are respectively signal-connected to the computer integrated control device 11.

[0044] Specifically, during use, the pneumatic valve positioner 47 can convert an electrical signal into a pneumatic signal. Specifically, during the test, the pneumatic valve positioner 47 can automatically adjust the conical flow cross-sectional area in the Laval nozzle 42 through the computer integrated control device 11 to adjust the stable output of the gas flow rate into the rotary valve 8 to an appropriate value, ensuring that the material can freely fall, thereby effectively eliminating the experimental error caused by the gas flow rate fluctuation generated by the rotary valve 8 during the feeding process; at this time, the computer integrated control device 11 can also record the pressure value displayed on the gas flow control unit 4 at this time, so that the pressure can be adjusted to the recorded value in subsequent tests; in addition, under the load state, when the rotary valve 8 leaks air, the gas flow control unit 4 can also balance the leaked gas volume to increase the gas flow rate and transport the material into the storage bin 28 to prevent pipe blockage; in addition, the first connecting pipe 19 can also be set as a large-diameter pipe to be suitable for materials that need to be fed under a constant gas flow rate.

[0045] Furthermore, the first flange 13 is detachably and fixedly connected to the base 1. Specifically, the inner diameter of the top surface opening of the base 1 is not greater than the inner diameter of the flange 85 on the rotary valve 8 of the smallest specification. The inner diameter of the first flange 13 is adapted to the inner diameter of the top surface opening of the base 1, and the first flange 13 and the base 1 are connected by countersunk bolts. This can facilitate the disassembly and assembly of the first flange 13 on the base 1. At the same time, it can also facilitate the replacement of the first flange 13 with different outer diameters to be suitable for installing rotary valves 8 of different specifications on the base 1, thereby facilitating the test of whether the whole machine housing of rotary valves 8 of different specifications leaks air and facilitating the test of the air leakage volume of rotary valves 8 of different specifications in the static state; secondly, the second flange 21 is detachably and fixedly connected to the exhaust hopper 9. Specifically, the inner diameter of the second flange 21 is adapted to the inner diameter of the bottom surface opening of the exhaust hopper 9, and the second flange 21 and the exhaust hopper 9 are connected by countersunk bolts. This can facilitate the disassembly and assembly of the second flange 21 on the exhaust hopper 9. At the same time, it can also facilitate the replacement of the second flange 21 with different outer diameters to be suitable for installing the exhaust hopper 9 on rotary valves 8 of different specifications, thereby facilitating the test of the air leakage volume of rotary valves 8 of different specifications in the no-load state and the load state. Generally speaking, the present invention can obtain accurate test data on the air leakage volume of various models and customized rotary valves 8.

[0046] Currently, in different application scenarios, the working pressure range of the rotary valve 8 will be different. According to the relevant regulations in the "JB / T 11057-2023 Technical Conditions for Rotary Valves": the working pressure range of the rotary valve 8 is from -0.05 MPa to +0.60 MPa, that is, the airtight performance of the rotary valve 8 can be divided into high-pressure sealing type, medium-pressure sealing type, and low-pressure sealing type according to different working condition pressures. Therefore, such as Figure 1 、 Figure 3 andFigure 7 As shown in the figure, a pressure regulating device 5 is connected to the intake pipeline 14 between the first gas flowmeter 15 and the pressure sensor 16. The pressure regulating device 5 is signal-connected to the computer integrated control device 11. The pressure regulating device 5 includes three branch pipes arranged side by side. Both ends of the branch pipes are connected to the intake pipeline 14. And the three branch pipes are respectively the first branch pipe 51, the second branch pipe 52 and the third branch pipe 53. A third switching valve 54 is installed on the first branch pipe 51. The third switching valve 54 is a pneumatic valve and can be used to open and close the gas transmission channel in the first branch pipe 51. When in use, when the third switching valve 54 is opened, it can be applied to the working condition with a working pressure of 0.20 - 0.45 MPa to meet the test requirements of the high-pressure sealed rotary valve.

[0047] Secondly, two fourth switching valves 55 are installed on the second branch pipe 52. The fourth switching valves 55 are pneumatic valves and can be used to open and close the gas transmission channel in the second branch pipe 52. A medium-pressure reducing valve 56 is installed on the second branch pipe 52 between the two fourth switching valves 55. When in use, when the fourth switching valves 55 are opened, it can be applied to the working condition with a working pressure of 0.1 - 0.20 MPa to meet the test requirements of the medium-pressure sealed rotary valve; finally, two fifth switching valves 57 are installed on the third branch pipe 53. The fifth switching valves 57 are pneumatic valves and can be used to open and close the gas transmission channel in the third branch pipe 53. A low-pressure reducing valve 58 is installed on the third branch pipe 53 between the two fifth switching valves 57. When in use, when the fifth switching valves 57 are opened, it can be applied to the working condition with a working pressure of -0.05 - 0.1 MPa to meet the test requirements of the low-pressure sealed rotary valve test; and various valves of the pressure regulating device 5 are respectively signal-connected to the computer integrated control device 11. In this way, when in use, according to the pressure requirement, the pressure value for the air leakage amount test can be set in the computer integrated control device 11, and then the third switching valve 54, the fourth switching valves 55 and the fifth switching valves 57 can be accurately controlled respectively through the computer integrated control device 11. In this way, the corresponding branch pipelines can be automatically selected and switched, so that the airtightness of the rotary valve 8 can be tested within different working pressure ranges of the present invention.

[0048] Furthermore, as Figure 1 shown in Figure 3 the figure, a temperature sensor 30 is installed on the intake pipeline 14 between the pressure sensor 16 and the first gas transmission hose 20. The temperature sensor 30 is signal-connected to the computer integrated control device 11. When the rotary valve 8 is in the stationary state, the no-load state and the load state, the temperature sensor 30 can always detect the gas temperature value in the gas transmission channel in real time. Then, combined with the pressure value in the gas transmission channel detected by the pressure sensor 16 and the air leakage amount of the rotary valve 8 under the test working condition, the following formula can be set in the computer integrated control device 11 in advance:

[0049] , where: 101.325 Kpa = 1 standard atmospheric pressure; 273.15 °C = 0 °C, the temperature with absolute zero as the starting point for calculation; the value of the actual atmospheric pressure is the atmospheric pressure value of the environment where the present invention is located, which can be measured by an external barometer and then input into the computer integrated control device 11; in this way, the test result of the leakage rate of the rotary valve 8 under the test conditions can be converted into the corresponding value under the standard conditions, and the standard conditions in physics and chemistry are the conditions when the temperature is 0 °C and the pressure is 101.325 kPa, which is convenient to judge whether the airtightness of the rotary valve 8 is qualified.

[0050] The specific setting method of the gas source device 3 is as follows: As Figure 1 shown in Figure 3 , the gas source device 3 includes an air compressor 31, and a blower is built in the air compressor 31 as the power source. The air compressor 31 is signal-connected to the computer integrated control device 11; the air compressor 31 is communicated with an air receiver 33 through a second air delivery hose 32, and the second air delivery hose 32 is communicated with the bottom of the air receiver 33; one end of the air inlet pipe 14 far from the base 1 is communicated with the top of the air receiver 33, and a filter pressure reducing valve 34 is installed at one end of the air inlet pipe 14 close to the air receiver 33. Specifically, during use, the compressed air generated in the air compressor 31 can be transported to the air receiver 33 through the second air delivery hose 32 for storage, and then the compressed air in the air receiver 33 flows into the air inlet pipe 14 after being stabilized by the filter pressure reducing valve 34; by setting the air receiver 33, it can be used as a temporary storage to meet the peak demand of the test system; at the same time, since the moisture in the air will condense during the compression process, the air receiver 33 also helps to reduce the moisture content in the test system, and when needed, the water can be quickly discharged through the drain port on the air receiver 33; secondly, by setting the filter pressure reducing valve 34, the stability of the gas source pressure introduced into the rotary valve 8 can be ensured, and the energy consumption can be reduced; at the same time, the filter pressure reducing valve 34 can filter out the impurities in the compressed gas, reduce the pipeline blockage, so that the frequency of equipment maintenance can be reduced and the maintenance cost can be reduced; in addition, the filter pressure reducing valve 34 can also keep the pressure in the pipeline stable to protect the equipment from being damaged by too high or too low pressure and extend the service life of the equipment.

[0051] The use process of the present invention is specifically as follows:

[0052] Step 1: Before the test, the rotary valve 8 can be installed on the base 1 by using the first flange 13;

[0053] Step 2: Extend the telescopic end of the telescopic device 2 to make the sealing cover seal the top opening of the rotary valve 8;

[0054] Step 3: Start the gas source device 3 and supply gas continuously for a period of time. Then, through the pressure sensor 16 and the computer integrated control device 11, it can be judged whether the rotary valve 8 is filled with gas. When the rotary valve 8 is filled with gas, the gas source device 3 is stopped from supplying gas through the computer integrated control device 11. At this time, if the computer integrated control device 11 subsequently collects that the flow rate value of the first gas flowmeter 15 has not changed, it indicates that there is no air leakage in the whole machine housing when the rotary valve 8 is in a static state, and proceed to Step 5. Otherwise, it indicates that there is an air leakage in the whole machine housing of the rotary valve 8, and proceed to Step 4;

[0055] Step 4: When the airtightness of the whole machine housing of the rotary valve 8 is unqualified, the end cover 82 of the rotary valve 8 to be tested can be sealed with a sealing film. Then, by collecting the fluctuating gas volume value on the first gas flowmeter 15 through the computer integrated control device 11, it can be judged whether there is air leakage at the shaft seal of the rotary valve 8, and the air leakage amount data per unit time is recorded. This air leakage amount value is the air leakage amount value at the shaft seal; then remove the sealing film at the end cover 82, and the remaining operations are the same as those for testing the air leakage amount at the shaft seal. At this time, the change in the gas volume data on the first gas flowmeter 15 is the total air leakage amount value, and the air leakage amount value at the end face is the total air leakage amount value minus the air leakage amount value at the shaft seal, and the test program ends;

[0056] Step 5: For the rotary valve 8 that has passed the housing airtightness test, after the bracket 12 and the base 1 are misaligned, reach into the rotary valve 8 and rotate the rotating shaft 83 to detect whether the rotating shaft 83 can operate normally. Then start the motor 84 to make the rotary valve 8 operate for a period of time, and observe whether there are any abnormal phenomena such as vibration and noise in the rotary valve 8 during this period to test the operating condition of the rotary valve 8. When the operating condition of the rotary valve 8 is abnormal, the test program ends;

[0057] Step 6: When there is no abnormality in the operating condition of the rotary valve 8, the exhaust hopper 9 can be installed on the rotary valve 8, and then the air leakage amount of the rotary valve 8 under no-load conditions can be tested. At this time, when testing the air leakage amount at the shaft seal of the rotary valve 8, the end cover 82 also needs to be sealed with a sealing film. Then, when the test system runs for a period of time and tends to be stable, the computer integrated control device 11 can collect the value of the gas discharged from the exhaust pipe 22 per unit time recorded in real time on the second gas flowmeter 23. Then, the difference from the intake gas volume per unit time recorded on the first gas flowmeter 15 can reflect the true value of the air leakage amount at the shaft seal of the rotary valve 8 under no-load conditions; the air leakage amount test at the end face under no-load conditions is the same as that at the shaft seal, but the sealing film for sealing the end cover 82 needs to be removed. At this time, the change in the gas volume data recorded on the second gas flowmeter 23 is the total air leakage amount value, and the air leakage amount value at the end face is the total air leakage amount value minus the air leakage amount value at the shaft seal. When the air leakage amount of the rotary valve 8 under no-load conditions is unqualified, the test program ends;

[0058] Step 7: When the air leakage of the rotary valve 8 is qualified under no-load condition, the first switching valve 24 can be opened. After a certain amount of material is filled in the rotary valve 8, the first switching valve 24 is closed to make the rotary valve 8 in a loaded state. Then, the air leakage of the rotary valve 8 under the loaded state can be tested. At this time, when testing the air leakage at the shaft seal of the rotary valve 8, the end cover 82 also needs to be sealed with a sealing film. Then, after the test system runs for a period of time and tends to be stable, the computer integrated control device 11 can collect the value of the gas discharged from the conveying pipe 27 per unit time recorded in real time on the third gas flowmeter 29. At the same time, the computer integrated control device 11 can collect the value of the gas discharged from the exhaust pipe 22 per unit time recorded in real time on the second gas flowmeter 23. Then, after adding the values of the third gas flowmeter 29 and the second gas flowmeter 23, the difference from the intake air volume per unit time recorded on the first gas flowmeter 15 can reflect the true value of the air leakage at the shaft seal of the rotary valve 8 under the loaded state. The air leakage test at the end face under the loaded state is the same as that at the shaft seal, but the sealing film for sealing the end cover 82 needs to be removed. At this time, the sum of the changes in the gas volume data recorded on the second gas flowmeter 23 and the third gas flowmeter 29 is the total air leakage volume value, and the air leakage volume value at the end face is the total air leakage volume value minus the air leakage volume value at the shaft seal, and the test program ends.

[0059] Among them, in Steps 3, 4, 6, and 7, the computer integrated control device 11 can automatically select and switch the corresponding branch pipelines of the pressure regulating device 5; in Step 7, the gas flow control unit 4 can be used to adjust the gas flow output to the rotary valve 8 to a suitable value and make the material discharge easier by using the jet device 6 for jetting; and the computer integrated control device 11 can adjust the rotation speed and rotation direction of the rotating shaft 83; in Steps 4, 6, and 7, the computer integrated control device 11 collects the flow value signal every 100 ms and calculates the difference and outputs it as the air leakage volume.

[0060] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A rotary valve testing device, comprising a computer integrated control device and a support table, characterized in that: A bracket is mounted on the support platform. At the top of the bracket, a vertically distributed telescopic device is installed. The bottom end of the telescopic device is a telescopic end and is coaxially installed with a sealing cover. A base is installed on the support platform below the sealing cover. The base is a housing structure with an open top surface, and a first flange is coaxially installed at the open position of the top surface of the base. A gas source device is connected to the base through an air inlet pipe. A first gas flowmeter and a pressure sensor are sequentially installed on the air inlet pipe. The first gas flowmeter is arranged close to the gas source device. The computer integrated control device is respectively connected to the gas source device, the first gas flowmeter, and the pressure sensor in a signal connection; The base is slidably connected to the support platform to form a movable base, and a first connecting pipe is connected to the base. One end of the first connecting pipe away from the base is connected to the air inlet pipe through a first gas transmission hose; The testing device further includes a vertically distributed exhaust hopper. The bottom surface of the exhaust hopper is provided with an opening, and a second flange is coaxially installed at the opening position of the bottom surface of the exhaust hopper. A exhaust pipe is connected to the top of the exhaust hopper. A second gas flowmeter connected to the computer integrated control device in a signal connection is connected to the exhaust pipe; A feeding tank is coaxially connected to the top of the exhaust hopper. A first switching valve is installed at the bottom of the feeding tank. The first connecting pipe is a horizontally arranged inverted T-shaped pipe. The vertical pipe of the inverted T-shaped pipe is coaxially arranged with the base. One end of the horizontal pipe of the inverted T-shaped pipe is connected to the first gas transmission hose, and the other end of the horizontal pipe of the inverted T-shaped pipe is connected to a feeding hose. One end of the feeding hose away from the first connecting pipe is connected to a feeding pipe with a second switching valve. The other end of the feeding pipe away from the feeding hose is connected to a storage bin, and a third gas flowmeter connected to the computer integrated control device in a signal connection is connected to the feeding pipe; 2. The rotary valve testing device according to claim 1, characterized in that: Jetting devices are connected between both sides of the base and the horizontal pipe of the inverted T-shaped pipe. Each jetting device includes a jetting pipe. Both ends of the jetting pipe are respectively connected to the base and the horizontal pipe of the inverted T-shaped pipe, and automatic switching valves connected to the computer integrated control device in a signal connection are installed on the jetting pipes; 3. A rotary valve testing device according to claim 1, characterized in that: A gas flow control unit is connected to the air inlet pipe between the pressure sensor and the first gas transmission hose. The gas flow control unit is connected to the computer integrated control device in a signal connection. The gas flow control unit includes a second connecting pipe with both ends open. Both ends of the second connecting pipe are connected to the air inlet pipe. A Laval nozzle is connected between one end of the second connecting pipe and the air inlet pipe. A safety valve, a contact pressure gauge, and a pressure transmitter are sequentially installed on the second connecting pipe. The pressure transmitter is arranged close to the Laval nozzle. The Laval nozzle is arranged close to the first gas transmission hose; A third connecting pipe is also arranged on one side of the second connecting pipe. Both ends of the third connecting pipe are respectively connected to the second connecting pipe on both sides of the contact pressure gauge, and a pneumatic valve positioner is installed on the third connecting pipe; 4. A rotary valve testing device according to claim 1, characterized in that: The first flange is detachably and fixedly connected to the base, and the second flange is detachably and fixedly connected to the exhaust hopper.

5. A rotary valve testing device according to claim 1, characterized in that: A pressure regulating device is connected to the intake pipe between the first gas flowmeter and the pressure sensor. The pressure regulating device is signal-connected to the computer integrated control device. The pressure regulating device includes three branch pipes arranged side by side. Both ends of the branch pipes are connected to the intake pipe. The three branch pipes are the first branch pipe, the second branch pipe, and the third branch pipe respectively. A third switching valve is installed on the first branch pipe. Two fourth switching valves are installed on the second branch pipe. A medium-pressure reducing valve is installed on the second branch pipe between the two fourth switching valves. Two fifth switching valves are installed on the third branch pipe. A low-pressure reducing valve is installed on the third branch pipe between the two fifth switching valves.

6. The rotary valve testing device according to claim 1, characterized in that: A temperature sensor is installed on the intake pipe between the pressure sensor and the first gas transmission hose. The temperature sensor is signal-connected to the computer integrated control device.

7. A rotary valve testing device according to claim 1, characterized in that: The gas source device includes an air compressor. The air compressor is connected to an air receiver through a second gas transmission hose. One end of the intake pipe away from the base is connected to the air receiver. A filter reducing valve is installed at one end of the intake pipe close to the air receiver.

8. A rotary valve testing device according to claim 1, characterized in that: The usage method of the test device includes the following steps: Step 1: Before the test, use the first flange to install the rotary valve on the base. Step 2: Extend the telescopic end of the telescopic device so that the sealing cover seals the top opening of the rotary valve. Step 3: Start the gas source device and continuously supply gas for a period of time. Then, judge whether the rotary valve is filled with gas through the pressure sensor and the computer integrated control device. When the rotary valve is filled with gas, stop the gas supply of the gas source device through the computer integrated control device. At this time, if the computer integrated control device subsequently collects that the flow value of the first gas flowmeter has not changed, it indicates that there is no air leakage in the whole machine housing when the rotary valve is in a static state. Continue to Step 5. Otherwise, it indicates that there is an air leakage in the whole machine housing of the rotary valve. Continue to Step 4. Step 4: When the airtightness of the whole machine housing of the rotary valve is unqualified, use a sealing film to seal the end cover of the rotary valve to be tested. Then, judge whether there is air leakage at the shaft seal of the rotary valve by collecting the fluctuating gas volume value on the first gas flowmeter through the computer integrated control device, and record the air leakage data per unit time. This air leakage value is the air leakage value at the shaft seal. Then remove the sealing film at the end cover. The remaining operations are the same as those for testing the air leakage at the shaft seal. At this time, the change in the gas volume data on the first gas flowmeter is the total air leakage value, and the air leakage value at the end face is the total air leakage value minus the air leakage value at the shaft seal. End the test program. Step 5: For the rotary valve that has passed the housing airtightness test, after the bracket and the base are misaligned, put your hand into the rotary valve to rotate the rotating shaft to detect whether the rotating shaft is operating normally. Then start the motor to make the rotary valve operate for a period of time, and observe whether there are any abnormal phenomena such as vibration and noise in the rotary valve during this period to test the operating condition of the rotary valve. When the operating condition of the rotary valve is abnormal, end the test program. Step 6: When the operation of the rotary valve is normal, install the exhaust hopper on the rotary valve, and then test the air leakage of the rotary valve under no-load conditions. At this time, when testing the air leakage at the shaft seal of the rotary valve, it is also necessary to seal the end cover with a sealing film. Then, after the test system has run for a period of time and stabilized, the computer integrated control device collects the value of the gas discharged from the exhaust pipe per unit time recorded in real time on the second gas flowmeter, and then the difference between the air intake volume per unit time recorded on the first gas flowmeter reflects the true value of the air leakage at the shaft seal of the rotary valve under no-load conditions; while the air leakage test at the end face under no-load conditions is the same as that at the shaft seal, but the sealing film for sealing the end cover needs to be removed. At this time, the change in the gas volume data recorded on the second gas flowmeter is the total air leakage value, and the air leakage value at the end face is the total air leakage value minus the air leakage value at the shaft seal. When the air leakage of the rotary valve under no-load conditions fails to meet the standard, the test procedure ends; Step 7: When the air leakage of the rotary valve under no-load conditions meets the standard, open the first switch valve until a certain amount of material is contained in the rotary valve, then close the first switch valve to make the rotary valve in a loaded state, and then test the air leakage of the rotary valve in the loaded state. At this time, when testing the air leakage at the shaft seal of the rotary valve, it is also necessary to seal the end cover with a sealing film; then, after the test system has run for a period of time and stabilized, the computer integrated control device collects the value of the gas discharged from the material conveying pipe per unit time recorded in real time on the third gas flowmeter. At the same time, the computer integrated control device collects the value of the gas discharged from the exhaust pipe per unit time recorded in real time on the second gas flowmeter. Then, after adding the values of the third gas flowmeter and the second gas flowmeter, the difference from the air intake volume per unit time recorded on the first gas flowmeter reflects the true value of the air leakage at the shaft seal of the rotary valve in the loaded state; while the air leakage test at the end face in the loaded state is the same as that at the shaft seal, but the sealing film for sealing the end cover needs to be removed. At this time, the sum of the changes in the gas volume data recorded on the second gas flowmeter and the third gas flowmeter is the total air leakage value, and the air leakage value at the end face is the total air leakage value minus the air leakage value at the shaft seal, and the test procedure ends.

Images