A pipeline front and rear pressure difference control and adjustment system and adjustment method

Abstract

The present invention discloses a pipeline front and rear pressure difference control and adjustment system and adjustment method, including a test bench, a pressure difference adjustment mechanism, a control unit, a calculation unit, a detection unit, an execution unit, an alarm unit and a display unit; the control unit is located in a computer control cabinet, and the control unit is used to control and adjust the gas flow rate passing through two pressure difference adjustment mechanisms; the calculation unit includes a pressure difference meter, and calculates the pressure difference value according to the pressure values ​​at the inlet and outlet sides of the pipeline to be tested, and obtains the feedback adjustment amount; the detection unit is used to detect the intake flow rate, intake temperature and intake pressure; the execution unit includes a gas supply mechanism, which is used to supply gas to obtain test gas; the alarm unit includes an alarm device; and the display unit includes a display. The present invention controls the gas flow rate of the two front and rear pressure difference adjustment mechanisms by the control unit until the pressure difference value calculated by the calculation unit is consistent with the set value, thereby realizing the automatic control and adjustment of the front and rear pressure difference of the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of differential pressure regulation control systems, and more specifically, to a differential pressure control and regulation system and a regulation method for pipelines. Background Art

[0002] Stainless steel corrugated pipes are used for the transportation of gas, so the quality of stainless steel corrugated pipes directly affects the quality and safety performance of gas.

[0003] Stainless steel corrugated pipes need to undergo various performance tests, among which the quality of flow tests directly affects the quality of gas transportation. The current flow test requires ventilation of the pipe to be tested, and the pressure difference before and after the pipe needs to be adjusted to the specified value before it is calculated into the flow rate. However, the pressure difference control adjustment of the current pressure difference test device before and after the pipe is adjusted is performed by conventional valve adjustment, which is inconvenient and time-consuming. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a pipeline front and rear pressure difference control and adjustment system and adjustment method, which controls the gas flow rate of the two front and rear pressure difference adjustment mechanisms through a control unit until the pressure difference value calculated by the calculation unit is consistent with the set value, thereby realizing automatic control and adjustment of the front and rear pressure difference of the pipeline.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention discloses a pipeline front and rear pressure difference control and adjustment system, comprising a test bench, a pressure difference adjustment mechanism, a control unit, a calculation unit, a detection unit, an execution unit, an alarm unit and a display unit, wherein a computer control cabinet is arranged on the side of the test bench;

[0007] The control unit is located in the computer control cabinet, and the control unit is used to control the two pressure difference regulating mechanisms to adjust the gas flow rate passing through the two pressure difference regulating mechanisms;

[0008] The calculation unit includes a pressure differential meter, which calculates the pressure difference according to the pressure values ​​at the inlet and outlet sides of the pipeline to be measured to obtain the feedback adjustment amount;

[0009] A detection unit, used to detect the intake air flow rate, intake air temperature and intake air pressure, and obtain intake air flow rate value, intake air temperature value and intake air pressure value;

[0010] The execution unit includes a gas supply mechanism for supplying gas to obtain test gas;

[0011] An alarm unit, comprising an alarm device, wherein when the control unit feeds back an abnormal value, the alarm device is controlled to sound an alarm;

[0012] The display unit comprises a display for displaying the pressure difference setting value, the numerical values ​​of the calculation unit, the detection unit, the execution unit and the alarm unit.

[0013] Furthermore, the calculation unit includes:

[0014] The inlet pressure gauge is used to measure the pressure at the inlet side of the pipeline to be tested and obtain the inlet pressure value;

[0015] The outlet pressure gauge is used to measure the pressure at the outlet side of the pipeline to be tested and obtain the outlet pressure value;

[0016] The inlet pressure gauge and the outlet pressure gauge are respectively connected to the differential pressure gauge.

[0017] Furthermore, the detection unit comprises:

[0018] Temperature sensor, used to detect intake air temperature;

[0019] Flowmeter: There are two flowmeters, namely a large flowmeter and a small flowmeter. The small flowmeter is used to detect the flow rate within 100L / min, and the large flowmeter is used to detect the flow rate within the range of 100L / min-500L / min.

[0020] There are two pressure gauges, and the two pressure gauges are respectively connected to the large flow meter and the small flow meter.

[0021] Furthermore, the air supply mechanism includes a power component, a delivery pipe, a diverter pipe and a tee pipe. The power component is located in a computer control cabinet and can supply air. The power component is connected to the diverter pipe through a delivery pipe. The large flow meter and the small flow meter are respectively connected to the outlets at both ends of the diverter pipe. A connecting port is provided at one end of the tee pipe and the other two ends are respectively connected to the large flow meter and the small flow meter. The connecting port is connected to the air inlet end of the pressure difference regulating mechanism located at the inlet side of the pipeline to be tested.

[0022] Furthermore, an air inlet pipe and an air outlet pipe are provided above the test bench, the air inlet end of the air inlet pipe is connected to the air outlet end of the pressure difference regulating mechanism located on the inlet side of the pipeline to be tested, the air outlet end of the air outlet pipe is connected to the air inlet end of the pressure difference regulating mechanism located on the outlet side of the pipeline to be tested, the air inlet pipe is connected to the inlet pressure gauge, and the air outlet pipe is connected to the outlet pressure gauge.

[0023] Further, the pressure difference regulating mechanism includes a regulating core and two groups of first transmission mechanisms, the regulating core includes a first regulating gear, a second regulating gear and a partition, the partition is located between the first regulating gear and the second regulating gear, the first regulating gear includes a plurality of first regulating holes distributed along its axis, the second regulating gear includes a reference hole and a plurality of second regulating holes distributed along its axis, the partition includes a first through hole, the axis of the first regulating hole, the axis of the second regulating hole, and the axis of the reference hole can all coincide with the axis of the first through hole, and the gas flow direction in the regulating core is from the first regulating gear to the second regulating gear;

[0024] The first adjusting gear is connected to a group of first transmission mechanisms, and the second adjusting gear is connected to another group of first transmission mechanisms. The first adjusting gear and the second adjusting gear are rotated through the corresponding first transmission mechanisms to switch between a first adjusting hole coaxial with the first through hole and a second adjusting hole coaxial with the first through hole.

[0025] Furthermore, the diameters of the multiple first adjustment holes gradually decrease along the axis of the first adjustment gear, and the diameters of the multiple second adjustment holes gradually decrease along the axis of the second adjustment gear. The diameter of the second adjustment hole with the largest diameter is smaller than the diameter of the first adjustment hole with the smallest diameter. The diameter of the reference hole is consistent with the diameter of the first adjustment hole with the largest diameter, and the diameter of the first through hole is greater than or equal to the diameter of the reference hole.

[0026] A regulation method for a pipeline front-rear pressure difference control and regulation system, characterized by comprising:

[0027] S1. Set the value, and input the pressure difference, intake temperature range and intake pressure calculated according to the inner diameter and length of the pipeline to be tested into the control unit;

[0028] S2. Connect the pipeline to be tested, and connect the two ends of the pipeline to be tested to the air inlet pipe and the air outlet pipe respectively;

[0029] S3, air supply, the power part of the execution unit works to compress the air and transmit the compressed air, the detection unit detects the compressed air, and the compressed air passes through the pressure difference adjustment mechanism on the inlet side of the pipeline to be tested, the air inlet pipe, the pipeline to be tested, the air outlet pipe, the pressure difference adjustment mechanism on the outlet side of the pipeline to be tested and the outside in sequence;

[0030] S4, the pressure differential meter calculates the pressure difference value according to the pressure values ​​at the inlet and outlet sides of the pipeline to be tested and feeds it back to the control unit, and the control unit adjusts the pressure difference adjustment mechanism at the inlet side and the outlet side of the pipeline to be tested based on the feedback value to adjust the pressure difference value to the set value;

[0031] S5. Complete the pressure difference adjustment before and after the pipeline to be tested.

[0032] Furthermore, in step S3, the temperature sensor of the detection unit detects the temperature of the compressed air and feeds it back to the control unit. If the temperature exceeds the intake air temperature range, the alarm unit is triggered to operate.

[0033] The pressure gauge of the detection unit detects the intake pressure value of the compressed air and feeds back the value to the control unit, and the control unit controls and adjusts the power component based on the feedback value to adjust the intake pressure to a set value;

[0034] The initial state of the flow meter of the detection unit is that the pipeline at the large flow meter is open, and the pipeline at the small flow meter is closed. The compressed air flows through the large flow meter. If the large flow meter detects that the flow rate is less than 100L / min, the pipeline at the large flow meter is closed and the pipeline at the small flow meter is opened. If the flow rate is greater than 100L / min, the initial state is maintained.

[0035] Furthermore, in step S4, the adjustment method of the pressure difference adjustment mechanism is:

[0036] The control unit controls the motor of the pressure difference regulating mechanism to operate, thereby driving the first regulating gear and the second regulating gear of the pressure difference regulating mechanism to rotate, so as to switch the first regulating hole corresponding to the aperture of the first regulating gear and the second regulating hole corresponding to the aperture of the second regulating gear.

[0037] The beneficial effects of the present invention are:

[0038] When the test temperature is within the specified range, the pressure difference between the inlet and outlet sides of the test pipeline is calculated through the pressure differential gauge of the calculation unit to obtain the feedback adjustment amount. The control unit adjusts the pressure differential adjustment mechanism located at the inlet side and the outlet side of the pipeline to be tested based on the feedback value of the pressure differential gauge to adjust the pressure differential value to the set value. The control unit controls the rotation of the first adjustment gear and the second adjustment gear of the corresponding pressure differential adjustment mechanism to achieve pressure regulation on the inlet or outlet side of the pipeline to be tested, which can realize automatic control and adjustment of the pressure difference before and after the pipeline to be tested, is convenient for adjustment, and is convenient for flow inspection operation of the pipeline to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is the principle diagram of the present invention;

[0040] Figure 2 It is a front view of the present invention;

[0041] Figure 3 It is a structural schematic diagram of the present invention;

[0042] Figure 4 It is a schematic diagram of the local structure of the present invention;

[0043] Figure 5 It is a structural schematic diagram of the pressure difference regulating mechanism;

[0044] Figure 6 is a top view of the pressure difference adjustment mechanism;

[0045] Figure 7 is an internal schematic diagram of the pressure difference regulating mechanism;

[0046] Figure 8 is a cross-sectional view of the pressure difference regulating mechanism;

[0047] Fig. 9 It is a schematic diagram of the structure of the regulating core;

[0048] Fig.10 This is an exploded view of the regulating core;

[0049] Fig.11 It is a cross-sectional view of the regulating core.

[0050] Figure numerals: 1, test bench; 11, computer control cabinet; 12, display; 13, alarm device; 14, slide; 15, air inlet pipe; 16, air outlet pipe; 2, air supply mechanism; 21, power part; 22, delivery pipe; 23, temperature sensor; 24, shunt pipe; 25, flow meter; 26, three-way pipe; 27, connection port; 28, ball valve; 29, pressure gauge; 3, differential pressure gauge; 31, inlet pressure gauge; 32, outlet pressure gauge; 4, differential pressure adjustment mechanism; 41, shell; 411, air inlet; 412, air outlet; 413, annular sleeve; 42, side cover; 43, top cover; 44, reference symbol; 5, adjustment core; 51, first adjustment gear; 511, first adjustment hole; 52, second adjustment gear; 521, reference hole; 522, second adjustment gear Section hole; 53, partition; 531, first through hole; 532, first annular rib; 54, installation shaft; 55, sealing plate; 551, second through hole; 552, installation groove; 553, limit part; 554, second annular rib; 56, sealing gasket; 6, first transmission mechanism; 61, transmission shaft; 62, first gear; 621, first bevel gear; 63, second gear; 64, motor; 65, third gear; 7, pipeline to be tested; 8, second transmission mechanism; 81, fourth gear; 82, second bevel gear; 9, manual adjustment mechanism; 91, knob; 92, fifth gear; 93, positioning plate; 94, positioning symbol; 100, control unit; 200, calculation unit; 300, detection unit; 400, execution unit; 500, alarm unit; 600, display unit. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figures 1 to 11 As shown, a pipeline front and rear pressure difference control and adjustment system includes a test bench 1, a pressure difference adjustment mechanism 4, a control unit 100, a calculation unit 200, a detection unit 300, an execution unit 400, an alarm unit 500 and a display unit 600, and a computer control cabinet 11 is provided on the side of the test bench 1;

[0053] The control unit 100 is located in the computer control cabinet 11. The control unit 100 is a PLC or a single chip microcomputer. The control unit 100 is used to control the two pressure difference adjustment mechanisms 4 and adjust the gas flow rate passing through the two pressure difference adjustment mechanisms 4, thereby achieving pressure difference adjustment before and after the pipeline 7 to be tested;

[0054] like Figure 3 As shown, the computing unit 200 includes:

[0055] The inlet pressure gauge 31 disposed on the upper part of the test bench 1 is used to measure the pressure at the inlet side of the pipeline 7 to be tested to obtain the inlet pressure value;

[0056] The outlet pressure gauge 32 disposed on the upper part of the test bench 1 is used to measure the pressure at the outlet side of the pipeline 7 to be tested to obtain the outlet pressure value;

[0057] A pressure differential gauge 3 is arranged on the upper part of the test bench 1, and the inlet pressure gauge 31 and the outlet pressure gauge 32 are respectively connected to the pressure differential gauge 3. According to the pressure value of the inlet pressure gauge 31 on the inlet side of the tested pipeline 7 and the pressure value of the outlet pressure gauge 32 on the outlet side, the pressure difference is calculated to obtain the feedback adjustment amount. The control unit 100 adjusts the pressure differential regulating mechanism 4 on the inlet side of the tested pipeline 7 and the pressure differential regulating mechanism 4 on the outlet side based on the feedback value of the pressure differential gauge 3 to adjust the pressure difference to the set value.

[0058] An air inlet pipe 15 and an air outlet pipe 16 are provided above the test bench 1, the air inlet end of the air inlet pipe 15 is connected to the air outlet end of the pressure difference regulating mechanism 4 located on the inlet side of the pipeline to be tested 7, the air outlet end of the air inlet pipe 15 is fixed to one end of the pipeline to be tested 7, the air outlet end of the air outlet pipe 16 is connected to the air inlet end of the pressure difference regulating mechanism 4 located on the outlet side of the pipeline to be tested 7, the air inlet end of the air outlet pipe 16 is fixed to the other end of the pipeline to be tested 7, the air inlet pipe 15 is connected to the inlet pressure gauge 31 through a pipe, the air outlet pipe 16 is connected to the outlet pressure gauge 32 through a pipe, the gas pressure value at the air inlet pipe 15 can be displayed in the inlet pressure gauge 31, and the gas pressure value at the air outlet pipe 16 can be displayed in the outlet pressure gauge 32.

[0059] like Figure 3 and Figure 4 As shown, the detection unit 300 includes:

[0060] The temperature sensor 23 is used to detect the intake air temperature and feed back the detected temperature value to the control unit 100. Based on the feedback value, the control unit 100 displays the temperature through the display unit 600 and determines whether the intake air temperature meets the set value. The temperature setting value is 20℃±15℃.

[0061] The flow meter 25 is used to detect the intake air flow rate. There are two flow meters 25, namely a large flow meter and a small flow meter, both of which are installed on the side of the computer control cabinet 11. The small flow meter is used to detect the flow rate within 100L / min, and the large flow meter is used to detect the flow rate within the range of 100L / min-500L / min. When the front and rear pressure difference is adjusted to the set value, the control unit 100 displays the value in the flow meter in the display unit 600 for comparison with the flow rate calculated by the pipeline 7 to be tested, so as to determine whether the pipeline 7 to be tested is qualified.

[0062] The pressure gauge 29 is used to detect the intake pressure. There are two pressure gauges 29 , and the two pressure gauges 29 are connected to the large flow meter and the small flow meter respectively.

[0063] The execution unit 400 includes an air supply mechanism 2 for supplying air to obtain test gas. The air supply mechanism 2 includes a power component 21, a delivery pipe 22, a shunt pipe 24 and a three-way pipe 26. The power component 21 is located in the computer control cabinet 11. The power component 21 can supply air. The power component 21 is connected to the shunt pipe 24 through the delivery pipe 22. The temperature sensor 23 is arranged at the delivery pipe 22. The power component 21 is an air pump, which is a prior art. The large flow meter and the small flow meter are respectively connected to the outlets at both ends of the shunt pipe 24. A connecting port 27 is provided at one end of the three-way pipe 26 and the other two ends are respectively connected to the large flow meter and the small flow meter. The connecting port 27 is connected to the air inlet end of the pressure difference adjustment mechanism 4 located on the inlet side of the pipeline 7 to be tested.

[0064] Corresponding ball valves 28 are provided at the connection points between the three-way pipe 26 and the large flow meter and the small flow meter. The ball valves 28 can be used to close and open the pipelines at the corresponding flow meters 25 .

[0065] The alarm unit 500 includes an alarm device 13, which is installed on the top of the computer control cabinet 11. When the control unit 100 feeds back an abnormal value, the alarm device 13 is controlled to sound an alarm.

[0066] The display unit 600 includes a display 12 for displaying the pressure difference setting value, the numerical values ​​of the calculation unit 200, the detection unit 300, the execution unit 400 and the alarm unit 500.

[0067] When inspecting the pipeline 7 to be tested, it is necessary to straighten the pipeline 7 to be tested. Therefore, the air inlet pipe 15 and the pressure difference regulating mechanism 4 connected to the air inlet pipe 15 are fixed ends, and the air outlet pipe 16 and the pressure difference regulating mechanism 4 connected to the air outlet pipe 16 are movable ends. A slide groove 14 is arranged on the upper part of the test bench 1, and the movable end can move along the slide groove 14 to straighten the pipeline 7 to be tested.

[0068] like Figures 5 to 11 As shown, the pressure difference regulating mechanism 4 includes a shell 41 and an regulating core 5, and the regulating core 5 is installed in the shell 41. The regulating core 5 includes a first regulating gear 51, a second regulating gear 52, a partition 53, a mounting shaft 54 ​​and a sealing plate 55. The first regulating gear 51, the second regulating gear 52, the partition 53 and the sealing plate 55 are all connected through the mounting shaft 54, and the partition 53 and the sealing plate 55 are fixedly connected to the mounting shaft 54. The first regulating gear 51 and the second regulating gear 52 are connected to the mounting shaft 54 ​​by bearings, and both ends of the mounting shaft 54 ​​are inserted into both sides of the shell 41 and fixed. There are two sealing plates 55 and they are respectively located on the outside of the first regulating gear 51 and the outside of the second regulating gear 52, and the partition 53 is located between the first regulating gear 51 and the second regulating gear 52.

[0069] The first adjusting gear 51 includes a plurality of first adjusting holes 511 distributed along its axis, the second adjusting gear 52 includes a reference hole 521 and a plurality of second adjusting holes 522 distributed along its axis, the partition plate 53 includes a first through hole 531, the sealing plate 55 includes a second through hole 551, the axes of the first through hole 531 and the second through hole 551 coincide with each other and have the same diameter, the axes of the first adjusting hole 511, the axes of the second adjusting hole 522 and the axes of the reference hole 521 can all coincide with the axes of the first through hole 531, and the adjusting core 5 has a plurality of first adjusting holes 511 and a plurality of second adjusting holes 522 distributed along its axis. The gas flows in a direction from the first adjusting gear 51 to the second adjusting gear 52. The diameters of the plurality of first adjusting holes 511 gradually decrease along the axis of the first adjusting gear 51. The diameters of the plurality of second adjusting holes 522 gradually decrease along the axis of the second adjusting gear 52. The diameter of the second adjusting hole 522 with the largest diameter is smaller than the diameter of the first adjusting hole 511 with the smallest diameter. The diameter of the reference hole 521 is consistent with the diameter of the first adjusting hole 511 with the largest diameter. The diameter of the first through hole 531 is greater than or equal to the diameter of the reference hole 521.

[0070] When the gas pressure at the outlet end of the pressure difference regulating mechanism 4 is minimum, the axes of the second through hole 551, the first regulating hole 511 with the largest diameter, the first through hole 531 and the reference hole 521 coincide with each other. When the pressure needs to be increased, the pressure can be increased by rotating the first regulating gear 51 to switch the first regulating hole 511 with a smaller diameter. If the pressure is still insufficient after the axis of the first regulating hole 511 with the smallest diameter coincides with the axis of the first through hole 531, the second regulating gear 52 can be rotated again to coincide with the axis of the second regulating hole 522 with a smaller diameter and the axis of the first through hole 531. When the axis of the second regulating hole 522 with the smallest diameter coincides with the axis of the first through hole 531, the gas pressure at the outlet end of the pressure difference regulating mechanism 4 is maximum. The control unit 100 controls the rotation of the first regulating gear 51 and the second regulating gear 52 of the corresponding pressure difference regulating mechanism 4 to realize pressure regulation on the inlet side or outlet side of the pipeline 7 to be tested, and can realize automatic control and regulation of the pressure difference before and after the pipeline 7 to be tested, which is convenient for adjustment and flow test operation.

[0071] The greater the number of first adjustment holes 511 with different diameters and second adjustment holes 522 with different diameters, the higher the pressure adjustment accuracy.

[0072] like Figure 8 As shown, an air inlet 411 and an air outlet 412 are respectively provided on both sides of the shell 41, and the air inlet 411 and the air outlet 412 are coaxially arranged with the first through hole 531. The air inlet 411 of the pressure difference regulating mechanism 4 located on the inlet side of the pipeline to be tested 7 is connected to the connecting port 27, and the air outlet 412 is connected to the air inlet pipe 15. The air inlet 411 of the pressure difference regulating mechanism 4 located on the outlet side of the pipeline to be tested 7 is connected to the air outlet pipe 16, and the air outlet 412 is connected to the outside.

[0073] like Figure 7 and Figure 8 As shown, both ends of the installation shaft 54 ​​are inserted into and fixed on both sides of the shell 41, annular sleeves 413 are provided on both sides of the shell 41, and the sealing plate 55 is inserted into the annular sleeve 413. A limiting portion 553 is provided on the side of the sealing plate 55, and the limiting portion 553 is fixed with the annular sleeve 413. By setting the annular sleeve 413, not only can the adjustment core 5 be installed and limited, but also the movement of the sealing plate 55 can be effectively prevented.

[0074] A mounting groove 552 coaxial with the second through hole 551 is provided on one side of the sealing plate 55 close to the inner side of the shell 41 , and a sealing gasket 56 is installed in the mounting groove 552 . One side of the sealing gasket 56 abuts against the inner side of the shell 41 . By providing the sealing gasket 56 , sealing between the second through hole 551 and the shell 41 can be achieved.

[0075] like Fig.11 As shown, first annular ribs 532 are provided on both sides of the partition 53, and the first annular ribs 532 on both sides respectively abut the side of the first adjusting gear 51 and the side of the second adjusting gear 52. A second annular rib 554 is provided on one side of the sealing plate 55, and the second annular rib 554 of one sealing plate 55 abuts the side of the first adjusting gear 51 away from the partition 53, and the second annular rib 554 of the other sealing plate 55 abuts the side of the second adjusting gear 52 away from the partition 53. Both the partition 53 and the sealing plate 55 are made of Teflon and are self-lubricating. Through the above design, the sealing of the inside of the adjusting core 5 can be achieved.

[0076] like Figure 7 and Figure 8 As shown, the pressure difference adjustment mechanism 4 includes two groups of first transmission mechanisms 6, the first adjustment gear 51 is connected to one group of first transmission mechanisms 6, and the second adjustment gear 52 is connected to the other group of first transmission mechanisms 6. The first adjustment gear 51 and the second adjustment gear 52 are rotated by the corresponding first transmission mechanism 6 to switch the first adjustment hole 511 coaxial with the first through hole 531 and the second adjustment hole 522 coaxial with the first through hole 531. Specifically, the side covers 42 are closed on both sides of the shell 41, the first transmission mechanism 6 includes a transmission shaft 61 and a motor 64, and the first gear 62 and the second gear 64 are fixed at both ends of the transmission shaft 61. The gear 63 and the first gear 62 of the first transmission mechanism 6 connected to the first adjusting gear 51 are meshed with the first adjusting gear 51; the first gear 62 of the first transmission mechanism 6 connected to the second adjusting gear 52 are meshed with the second adjusting gear 52. The driving shaft end of the motor 64 is connected with a third gear 65, and the third gear 65 is meshed with the second gear 63. The second gear 63, the third gear 65 and the motor 64 are all located in the side cover 42. The control unit 100 can control the rotation of the first adjusting gear 51 or the second adjusting gear 52 by controlling the corresponding motor 64, thereby realizing the automatic adjustment of the front and rear pressures of the pipeline 7 to be tested.

[0077] like Figures 5 to 8 As shown, the pressure difference regulating mechanism 4 can also manually adjust the pressure difference. Specifically, the pressure difference regulating mechanism 4 includes a second transmission mechanism 8 corresponding to the first transmission mechanism 6 and a manual adjustment mechanism 9. The second transmission mechanism 8 includes a fourth gear 81 and a second bevel gear 82. A first bevel gear 621 is provided on the side of the first gear 62. The first bevel gear 621 is meshed with the second bevel gear 82. The manual adjustment mechanism 9 includes a knob 91 and a fifth gear 92. The knob 91 is located above the shell 41. The knob 91 can drive the fifth gear 92 to rotate. The fifth gear 92 is meshed with the fourth gear 81 and can drive the second bevel gear 82 to rotate. Therefore, by rotating the corresponding knob 91, the first adjusting gear 51 or the second adjusting gear 52 can be driven to rotate, thereby realizing the operation of manually adjusting the pressure difference, which is easy to operate.

[0078] A top cover 43 is provided on the upper part of the shell 41, the fourth gear 81 and the fifth gear 92 are both located in the top cover 43, the knob 91 is located above the top cover 43, a positioning disk 93 is provided at the lower part of the knob 91, and a plurality of positioning symbols 94 distributed along its axis are provided on the upper part of the positioning disk 93, the number of positioning symbols 94 of the manual adjustment mechanism 9 located at the first adjustment gear 51 is consistent with the first adjustment hole 511, and the number of positioning symbols 94 of the manual adjustment mechanism 9 located at the second adjustment gear 52 is consistent with the total number of the reference hole 521 plus the second adjustment hole 522.

[0079] A reference symbol 44 corresponding to the positioning symbol 94 is provided on the upper part of the top cover 43. By rotating the knob 91, the positioning symbols 94 at different positions can be aligned with the reference symbol 44 one by one, and when the knob 91 of the manual adjustment mechanism 9 is rotated at the first adjusting gear 51, when the positioning symbol 94 aligned with the reference symbol 44 is switched, the first adjustment hole 511 is also switched accordingly. Similarly, the adjustment method of the second adjusting gear 52 is consistent with that of the first adjusting gear 51.

[0080] A method for regulating a pressure difference control and regulating system before and after a pipeline, comprising:

[0081] S1, setting values, inputting the pressure difference value, intake temperature range value and intake pressure value calculated according to the inner diameter and length of the pipeline 7 to be tested into the control unit 100;

[0082] The pressure difference calculation formula is:

[0083]

[0084] L is the actual length of the pipeline 7 to be tested; D is the nominal size of the pressure pipe (the air inlet pipe 15 and the air outlet pipe 16);

[0085] Since the pipe 7 to be tested is a standard part, its nominal size specifications include DN10, DN15, DN20, DN25 and DN32. Therefore, in order to facilitate detection, when measuring the pipe 7 to be tested with the corresponding nominal diameter, the air inlet pipe 15 and the air outlet pipe 16 that are consistent with the nominal size of the pipe 7 to be tested are selected;

[0086] The intake air temperature range is set to 20°C ± 15°C, and the intake air pressure is set to 0.002MPa;

[0087] S2, connecting the pipeline to be tested 7, and connecting the two ends of the pipeline to be tested 7 to the air inlet pipe 15 and the air outlet pipe 16 respectively;

[0088] After the pipeline 7 to be tested is connected, the movable end is moved to straighten the pipeline 7 to be tested;

[0089] S3, air supply, the power part 21 of the execution unit 400 works to compress the air and transmit the compressed air, the detection unit 300 detects the compressed air, and the compressed air passes through the pressure difference adjustment mechanism 4 on the inlet side of the pipeline to be tested 7, the air inlet pipe 15, the pipeline to be tested 7, the air outlet pipe 16, the pressure difference adjustment mechanism 4 on the outlet side of the pipeline to be tested 7 and the outside in sequence;

[0090] In step S3, the temperature sensor 23 of the detection unit 300 detects the temperature of the compressed air and feeds it back to the control unit 100. If the temperature exceeds the intake air temperature range of 20°C ± 15°C, the alarm unit 500 is triggered to operate;

[0091] The pressure gauge 29 of the detection unit 300 detects the intake pressure value of the compressed air and feeds the value back to the control unit 100. The control unit 100 controls and adjusts the power part 21 based on the feedback value to adjust the intake pressure to the set value of 0.002 MPa.

[0092] The initial state of the flow meter 25 of the detection unit 300 is that the pipeline at the large flow meter is open, and the pipeline at the small flow meter is closed. The compressed air flows through the large flow meter. If the large flow meter detects that the flow rate is less than 100 L / min, the pipeline at the large flow meter is closed and the pipeline at the small flow meter is opened. If the flow rate is greater than 100 L / min, the initial state is maintained.

[0093] S4, the pressure differential meter 3 calculates the pressure difference value according to the pressure values ​​at the inlet and outlet sides of the pipeline to be tested 7 and feeds it back to the control unit 100, and the control unit 100 adjusts the pressure difference adjustment mechanism 4 at the inlet side and the pressure difference adjustment mechanism 4 at the outlet side of the pipeline to be tested 7 based on the feedback value, adjusts the pressure difference value to the set value ΔP, and the flow meter 25 records the flow at this time;

[0094] In step S4, the adjustment method of the pressure difference adjustment mechanism 4 is:

[0095] The control unit 100 controls the motor 64 of the pressure difference regulating mechanism 4 to work, thereby driving the first regulating gear 51 and the second regulating gear 52 of the pressure difference regulating mechanism 4 to rotate, so as to switch the first regulating hole 511 corresponding to the aperture of the first regulating gear 51 and the second regulating hole 522 corresponding to the aperture of the second regulating gear 52;

[0096] S5, completing the pressure difference adjustment before and after the pipeline 7 to be tested.

[0097] Table 1 is the standard flow table of the pipeline 7 to be tested

[0098] Nominal size (mm) DN10 DN15 DN20 DN25 DN32 Flow rate (m³ / h) 0.95 1.60 4.15 8.30 14.50

[0099] Take the length of the tested pipe 7 as L=1042mm, the nominal size as D=DN10, the test environment temperature as t=25.1℃, and the atmospheric pressure as 100.29kPa as an example, and perform flow test on it:

[0100] The required pressure difference is:

[0101]

[0102] The control unit 100 controls the two pressure difference adjustment mechanisms 4 to work, and adjusts the pressure difference before and after the pipeline 7 to be tested to the above-mentioned calculated value. After the pressure difference adjustment is completed, the value on the flow meter 25 is observed to be 20.1L / min, which is converted to 1.206 ;

[0103] The actual volume flow value in the pipeline 7 to be measured is:

[0104]

[0105] 1.153 >0.95 , the pipeline 7 to be tested is qualified.

[0106] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A regulation method for a pressure difference control and regulation system before and after a pipeline, characterized in that: The invention comprises a regulating system, wherein the regulating system comprises a test bench (1), a control unit (100), a calculation unit (200), a detection unit (300), an execution unit (400) and a pressure difference regulating mechanism (4); A computer control cabinet (11) is provided on the side of the test bench (1), and an air inlet pipe (15) and an air outlet pipe (16) are provided on the top of the test bench (1); The control unit (100) is located in the computer control cabinet (11), and the control unit (100) is used to control the two pressure difference regulating mechanisms (4) to adjust the gas flow rate passing through the two pressure difference regulating mechanisms (4); The calculation unit (200) comprises a pressure differential meter (3), which calculates the pressure difference according to the pressure values ​​at the inlet and outlet sides of the pipeline (7) to be tested, and obtains the feedback adjustment amount; The detection unit (300) is used to detect the intake air flow rate, intake air temperature and intake air pressure, and obtain the intake air flow rate value, intake air temperature value and intake air pressure value; The execution unit (400) comprises a gas supply mechanism (2) for supplying gas to obtain test gas, wherein the gas supply mechanism (2) comprises a power part (21); The adjustment method using the adjustment system includes the following steps: S1, setting values, inputting the pressure difference, intake temperature range and intake pressure values ​​calculated according to the inner diameter and length of the pipeline (7) to be tested into the control unit (100), wherein the intake temperature range is set to 20°C ± 15°C and the intake pressure value is set to 0.002MPa; The pressure difference calculation formula is: ； L is the actual length of the pipeline (7) to be tested, in mm; D is the nominal size of the air inlet pipe (15) and the air outlet pipe (16), in mm; S2, connecting the pipeline to be tested (7), and connecting the two ends of the pipeline to be tested (7) to the air inlet pipe (15) and the air outlet pipe (16) respectively; S3, air supply, the power part (21) of the execution unit (400) works to compress the air and transmit the compressed air, the detection unit (300) detects the compressed air, and the compressed air passes through the pressure difference adjustment mechanism (4) on the inlet side of the pipeline to be tested (7), the air inlet pipe (15), the pipeline to be tested (7), the air outlet pipe (16), the pressure difference adjustment mechanism (4) on the outlet side of the pipeline to be tested (7) and the outside in sequence; The detection unit (300) comprises: A temperature sensor (23), used for detecting intake air temperature; A flow meter (25), wherein the number of flow meters (25) is two, namely a large flow meter and a small flow meter, wherein the small flow meter is used to detect a flow rate within 100 L / min, and the large flow meter is used to detect a flow rate within a range of 100 L / min-500 L / min; A pressure gauge (29), wherein the number of the pressure gauges (29) is two, and the two pressure gauges (29) are connected to the large flow meter and the small flow meter respectively; The temperature sensor (23) of the detection unit (300) detects the temperature of the compressed air and feeds it back to the control unit (100); if the temperature exceeds the intake air temperature range, the alarm unit (500) is triggered to operate; The pressure gauge (29) of the detection unit (300) detects the intake pressure value of the compressed air and feeds back the value to the control unit (100), and the control unit (100) controls and adjusts the power component (21) based on the feedback value to adjust the intake pressure to a set value; The initial state of the flow meter (25) of the detection unit (300) is that the pipeline at the large flow meter is open and the pipeline at the small flow meter is closed, and the compressed air flows through the large flow meter. If the large flow meter detects that the flow rate is less than 100 L / min, the pipeline at the large flow meter is closed and the pipeline at the small flow meter is opened. If the flow rate is greater than 100 L / min, the initial state is maintained. S4, the pressure differential meter (3) calculates the pressure differential value according to the pressure values ​​at the inlet side and the outlet side of the pipeline to be tested (7), and feeds back the pressure differential value to the control unit (100), and the control unit (100) adjusts the pressure differential adjustment mechanism (4) at the inlet side and the pressure differential adjustment mechanism (4) at the outlet side of the pipeline to be tested (7) based on the feedback value; the pressure differential value is adjusted to a set value ΔP, and the flow meter (25) records the flow rate at this time; S5, completing the pressure difference adjustment before and after the pipeline (7) to be tested, and observing the value recorded by the flow meter (25) in step S4, and calculating the actual volume flow value in the pipeline (7) to be tested; The actual volume flow value is calculated as: is the value obtained by converting the value on the flow meter (25), the unit is ; is the atmospheric pressure of the test environment, in kPa; t is the temperature of the test environment, in °C.

2. According to claim 1, the adjustment method of the pipeline front and rear pressure difference control and adjustment system is characterized in that: The regulating system further comprises an alarm unit (500) and a display unit (600); The alarm unit (500) comprises an alarm device (13), and when the control unit (100) feeds back an abnormal value, the alarm device (13) is controlled to issue an alarm; The display unit (600) comprises a display (12) for displaying the pressure difference setting value, the numerical values ​​of the calculation unit (200), the detection unit (300), the execution unit (400) and the alarm unit (500).

3. According to claim 2, a regulation method of a pipeline front and rear pressure difference control and regulation system, characterized in that: The computing unit (200) comprises: An inlet pressure gauge (31) is used to measure the pressure at the inlet side of the pipeline (7) to be tested to obtain an inlet pressure value; An outlet pressure gauge (32) is used to measure the pressure at the outlet side of the pipeline (7) to be tested and obtain an outlet pressure value; The inlet pressure gauge (31) and the outlet pressure gauge (32) are respectively connected to the differential pressure gauge (3).

4. The adjustment method of the pipeline front and rear pressure difference control and adjustment system according to claim 1 is characterized in that: The air supply mechanism (2) further comprises a delivery pipe (22), a flow dividing pipe (24) and a three-way pipe (26); the power member (21) is located in the computer control cabinet (11); the power member (21) is capable of supplying air; the power member (21) is connected to the flow dividing pipe (24) via the delivery pipe (22); the large flow meter and the small flow meter are respectively connected to the outlets at both ends of the flow dividing pipe (24); one end of the three-way pipe (26) is provided with a connecting port (27) and the other two ends are respectively connected to the large flow meter and the small flow meter; the connecting port (27) is connected to the air inlet end of the pressure difference regulating mechanism (4) located at the inlet side of the pipeline to be tested (7).

5. The adjustment method of the pipeline front and rear pressure difference control and adjustment system according to claim 3 is characterized in that: The air inlet end of the air inlet pipe (15) is connected to the air outlet end of the pressure differential adjustment mechanism (4) located at the inlet side of the pipeline to be tested (7), the air outlet end of the air outlet pipe (16) is connected to the air inlet end of the pressure differential adjustment mechanism (4) located at the outlet side of the pipeline to be tested (7), the air inlet pipe (15) is connected to the inlet pressure gauge (31), and the air outlet pipe (16) is connected to the outlet pressure gauge (32).

6. The adjustment method of the pipeline front and rear pressure difference control and adjustment system according to claim 2 is characterized in that: The pressure difference adjustment mechanism (4) comprises an adjustment core (5) and two groups of first transmission mechanisms (6); the adjustment core (5) comprises a first adjustment gear (51), a second adjustment gear (52) and a partition (53); the partition (53) is located between the first adjustment gear (51) and the second adjustment gear (52); the first adjustment gear (51) comprises a plurality of first adjustment holes (511) distributed along its axis; the second adjustment gear (52) comprises a reference hole (521) and a plurality of second adjustment holes (522) distributed along its axis; the partition (53) comprises a first through hole (531); the axis of the first adjustment hole (511), the axis of the second adjustment hole (522) and the axis of the reference hole (521) can all coincide with the axis of the first through hole (531); the gas flow direction in the adjustment core (5) is from the first adjustment gear (51) to the second adjustment gear (52); The first adjusting gear (51) is connected to a group of first transmission mechanisms (6), and the second adjusting gear (52) is connected to another group of first transmission mechanisms (6). The first adjusting gear (51) and the second adjusting gear (52) are rotated through the corresponding first transmission mechanisms (6) to switch between a first adjusting hole (511) coaxial with the first through hole (531) and a second adjusting hole (522) coaxial with the first through hole (531).

7. The regulating method of the pipeline front and rear pressure difference control and regulation system according to claim 6, characterized in that: The diameters of the plurality of first adjustment holes (511) gradually decrease along the axis of the first adjustment gear (51), and the diameters of the plurality of second adjustment holes (522) gradually decrease along the axis of the second adjustment gear (52), the diameter of the second adjustment hole (522) with the largest diameter is smaller than the diameter of the first adjustment hole (511) with the smallest diameter, the diameter of the reference hole (521) is consistent with the diameter of the first adjustment hole (511) with the largest diameter, and the diameter of the first through hole (531) is greater than or equal to the diameter of the reference hole (521).

8. The adjustment method of the pipeline front and rear pressure difference control and adjustment system according to claim 7, characterized in that: In step S4, the pressure difference adjustment mechanism (4) is adjusted in the following manner: The control unit (100) controls the motor (64) of the pressure difference adjustment mechanism (4) to operate, thereby driving the first adjustment gear (51) and the second adjustment gear (52) of the pressure difference adjustment mechanism (4) to rotate, so as to switch between a first adjustment hole (511) of a corresponding aperture of the first adjustment gear (51) and a second adjustment hole (522) of a corresponding aperture of the second adjustment gear (52).

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