CN115901200A - Pressure-reduction backflow preventer circulation test platform and test method - Google Patents
Pressure-reduction backflow preventer circulation test platform and test method Download PDFInfo
- Publication number
- CN115901200A CN115901200A CN202211254465.0A CN202211254465A CN115901200A CN 115901200 A CN115901200 A CN 115901200A CN 202211254465 A CN202211254465 A CN 202211254465A CN 115901200 A CN115901200 A CN 115901200A
- Authority
- CN
- China
- Prior art keywords
- pressure
- outlet
- control valve
- backflow preventer
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 238000010998 test method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 230000001186 cumulative effect Effects 0.000 claims description 9
- 230000006837 decompression Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a circulating test platform and a test method for a pressure-reducing backflow preventer, which belong to the technical field of pressure-reducing backflow preventers, and comprise a variable frequency pump, an inlet control valve, a tested backflow preventer and an outlet control valve which are sequentially connected, wherein an inlet cavity, a middle cavity and an outlet cavity of the tested backflow preventer are respectively provided with an inlet cavity pressure sensor, a middle cavity pressure sensor and an outlet cavity pressure sensor, the front end of the inlet control valve and the front end of the outlet control valve are mutually communicated through a branch pipe, the branch pipe is provided with a pressure-increasing normally closed electromagnetic valve for controlling on-off, a pipeline between the inlet control valve and the inlet end of the tested backflow preventer is provided with a pressure-releasing normally closed electromagnetic valve for releasing pressure and draining water, and a test platform for performing reliability test on the pressure-reducing backflow preventer is constructed by arranging a plurality of sets of backflow control valves, electromagnetic valves and a pipeline network, so that the problem of difficult durability test on the pressure-reducing backflow preventer is solved.
Description
Technical Field
The invention relates to the technical field of pressure-reducing backflow preventers, in particular to a circulating test platform and a test method of a pressure-reducing backflow preventer.
Background
The backflow preventer is a hydraulic control combination device which strictly limits the water in the pipeline to flow in one direction under the condition that the backflow pollution of tap water supply equipment, particularly domestic drinking water pipelines is serious and no device for effectively preventing backflow pollution is available. The backflow preventer is mainly classified into a low resistance backflow preventer and a pressure-reducing backflow preventer.
The three parts are continuously opened and closed, and the defects of fatigue failure of a spring, abrasion of a rubber sealing surface, blocking of a channel and the like often occur, so that the check valve fails to work, and the fault of the pressure-reducing backflow preventer is caused. At present, a corresponding test platform and a corresponding test method are still lacked for the reliability test of the pressure-reducing backflow preventer in the industry, so that the verification of the durability of each action part of the pressure-reducing backflow preventer becomes difficult.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a circular test platform and a test method for a pressure-reducing backflow preventer.
The technical scheme adopted by the invention for solving the technical problems is as follows: a pressure-reducing backflow preventer circulation test platform, comprising:
the device comprises a measured backflow preventer, an inlet cavity, an intermediate cavity and an outlet cavity of the measured backflow preventer, wherein an inlet cavity pressure sensor, an intermediate cavity pressure sensor and an outlet cavity pressure sensor are respectively distributed on the inlet cavity, the intermediate cavity and the outlet cavity of the measured backflow preventer;
the inlet control valve is connected with the inlet end of the measured backflow preventer through a pipeline and is used for controlling water inlet of the inlet end of the measured backflow preventer;
the outlet control valve is connected with the outlet end of the measured backflow preventer through a pipeline and is used for controlling the water outlet of the outlet end of the measured backflow preventer;
the water outlet of the variable-frequency pump is connected with the other end of the inlet control valve through a pipeline;
the inlet control valve front end and the outlet control valve front end are communicated with each other through a branch pipe, a pressure-increasing normally closed electromagnetic valve used for controlling on-off is arranged on the branch pipe, a pressure-releasing normally closed electromagnetic valve used for releasing pressure and draining water is arranged on a pipeline between the inlet control valve and the inlet end of the measured backflow preventer, and a flowmeter is arranged on a pipeline between the variable frequency pump and the outlet control valve.
Preferably, the inlet control valve and the outlet control valve are both pneumatic butterfly valves.
Preferably, an inlet manual valve is arranged on a pipeline between the inlet control valve and the measured backflow preventer, an outlet manual valve is arranged on a pipeline between the measured backflow preventer and the outlet control valve, and the branch pipe is connected with a pipeline between the outlet manual valve and the outlet control valve.
Preferably, the system also comprises a remote control module and a camera, and control boxes of the inlet control valve, the outlet control valve, the inlet cavity pressure sensor, the middle cavity pressure sensor, the outlet cavity pressure sensor, the pressurization normally closed solenoid valve, the pressure relief normally closed solenoid valve and the variable frequency pump are all in communication connection with the remote control module.
Preferably, the variable frequency pump water inlet is connected with the circulating water tank through a pipeline, the other end of the outlet control valve is connected with the circulating water tank through a pipeline, and a backflow control valve is arranged on the pipeline between the outlet control valve and the circulating water tank.
A pressure-reducing backflow preventer circulation test method adopts the pressure-reducing backflow preventer circulation test platform, and comprises the following steps:
step S1, starting a variable frequency pump, and supplying water to the rear end by the variable frequency pump;
s2, opening an inlet control valve and an outlet control valve, and enabling the detected backflow preventer to be in an open state;
s3, respectively recording detection pressure values P1, P2 and P3 of the inlet cavity pressure sensor, the middle cavity pressure sensor and the outlet cavity pressure sensor, and flow values of the flowmeter;
s4, closing the outlet control valve and the inlet control valve in sequence, and enabling the measured backflow preventer to be in a closed state, namely enabling the measured backflow preventer to be in a zero-flow state;
s5, recording detection pressure values P1', P2' and P3' of the inlet cavity pressure sensor, the middle cavity pressure sensor and the outlet cavity pressure sensor respectively;
step S6, judging whether the attenuation quantity of the pressure difference value between P1 'and P2' relative to the pressure difference value between P1 and P2 is less than a limited attenuation quantity D1, if not, sending an alarm signal and stopping the test; judging whether the attenuation quantity of the pressure difference value between P2 'and P3' relative to the pressure difference value between P2 and P3 is less than a limited attenuation quantity D2 or not, if not, sending an alarm signal and stopping the test;
s7, if the attenuation amount of the pressure difference value is smaller than the limited attenuation amount D1 and the limited attenuation amount D2 respectively, adjusting the working frequency of the variable frequency pump, and increasing the outlet pressure of the variable frequency pump or keeping the initial outlet pressure of the variable frequency pump;
step S8, opening a pressurization normally closed electromagnetic valve to rapidly increase the pressure of an outlet cavity;
s9, judging whether the pressure of the middle cavity is kept unchanged, if not, sending an alarm signal and stopping testing;
step S10, if the pressure of the middle cavity is kept unchanged, the pressure relief normally closed electromagnetic valve is opened, the pressure of the inlet cavity is reduced, and a drain valve of the measured backflow preventer is opened;
s11, adjusting the working frequency of the variable frequency pump to enable the outlet pressure of the variable frequency pump to return to the initial outlet pressure;
step S12, adding 1 to the cycle cumulative number;
and S13, judging whether the cycle cumulative number reaches a set value, if not, repeating the steps S1 to S13, and if the cycle cumulative number reaches the set value, ending the test.
Preferably, in step S3, after the inlet control valve and the outlet control valve are opened and the set time gap T1 is maintained, the pressure values P1, P2, P3 detected by the inlet chamber pressure sensor, the intermediate chamber pressure sensor, the outlet chamber pressure sensor, and the flow rate value of the flow meter are recorded, respectively, wherein the set range of the time gap T1 is 3-10S.
Preferably, in step S5, after the outlet control valve and the inlet control valve are closed and the set time gap T2 is maintained, the detected pressure values P1', P2', and P3' of the inlet chamber pressure sensor, the intermediate chamber pressure sensor, and the outlet chamber pressure sensor are recorded, respectively, wherein the set range of the time gap T2 is 3-10S.
Preferably, in step 9, after the normally closed booster solenoid valve is opened and a set time gap T3 is maintained, it is determined whether the intermediate chamber pressure is maintained, wherein the set range of the time gap T3 is 3-10s.
Preferably, the limited attenuation amount D1 and the limited attenuation amount D2 have the value range of 8% -12%, and the limited attenuation amount D1 and the limited attenuation amount D2 are the same;
and step S1, after the variable frequency pump is kept started to a set time interval, judging whether the pressure of the outlet of the variable frequency pump reaches a set value, if not, sending an alarm signal and stopping the test, and if so, executing step S2.
The invention has the beneficial effects that: when testing, supply water to the circulation test platform through the inverter pump, cooperation inlet control valve, the outlet control valve, pressure boost normally closed solenoid valve and pressure release normally closed solenoid valve, the simulation is surveyed the various operating modes of backflow preventer, and under through detecting different operating modes, the pressure value of each cavity in the surveyed backflow preventer, from in circulation test, judge whether the spare part in the surveyed backflow preventer breaks down, compare in prior art, through setting up the multiunit control valve, the solenoid valve with lay pipeline network, thereby establish a test platform who is used for carrying out decompression type backflow preventer reliability testing, solve the problem of decompression type backflow preventer durability test difficulty, the improvement is in the design, the product quality of decompression type backflow preventer in the production process.
Drawings
FIG. 1 is a schematic diagram of a cycle test platform according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
FIG. 3 is a schematic cross-sectional view of a backflow preventer under test according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating steps of a loop test method according to an embodiment of the present invention.
In the figure, 10, a backflow preventer to be tested; 11. an inlet check valve; 12. an outlet check valve; 13. a water drain valve; 14. an inlet chamber; 15. a middle cavity; 16. an outlet chamber; 17. an inlet chamber pressure sensor; 18. intermediate chamber pressure sensing; 19. an outlet chamber pressure sensor; 21. an inlet control valve; 22. an outlet control valve; 30. a variable frequency pump; 31. a branch pipe; 32. a pressure-increasing normally closed electromagnetic valve; 41. a pressure relief normally closed solenoid valve; 50. a flow meter; 61. an inlet end manual valve; 62. an outlet end manual valve; 70. a remote control module; 71. a camera; 80. a circulating water tank; 81. and a reflux control valve.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-4, the present invention provides a circulation testing platform for a pressure-reducing backflow preventer, comprising:
the measured backflow preventer 10 mainly comprises an inlet check valve 11, an outlet check valve 12 and a drain valve 13, wherein the inlet check valve 11 and the outlet check valve 12 divide the interior of the measured backflow preventer 10 into an inlet cavity 14, an intermediate cavity 15 and an outlet cavity 16, the inlet check valve 11 and the outlet check valve 12 are respectively provided with a closing spring for pushing the valve body to close through reverse acting force, the check valves are pushed to open by water flow, a certain pressure drop is generated, namely, the pressures of the inlet cavity 14, the intermediate cavity 15 and the outlet cavity 16 are gradually reduced in the open state of the measured backflow preventer 10, a diaphragm of the drain valve 13 divides a control cavity of the drain valve 13 into two pressure cavities, one pressure cavity is communicated with the inlet cavity 14 and has the same pressure value, the other pressure cavity is communicated with the intermediate cavity 15 and has the same pressure value, the opening and closing of the drain valve 13 are controlled through the water pressure difference of the inlet cavity 14 and the intermediate cavity 15, and the inlet cavity 14, the intermediate cavity 15 and the outlet cavity 16 of the measured backflow preventer 10 are respectively provided with an inlet cavity pressure sensor 17, an intermediate cavity pressure sensor 18 and an outlet cavity pressure sensor 19 for detecting the corresponding cavity;
an inlet control valve 21 connected to the inlet of the backflow preventer 10 through a pipe for controlling the inflow of water to the inlet of the backflow preventer 10;
an outlet control valve 22 connected to the outlet of the measured backflow preventer 10 through a pipe for controlling the outflow of water from the outlet of the measured backflow preventer 10;
the water outlet of the variable frequency pump 30 is connected with the other end of the inlet control valve 21 through a pipeline;
wherein, inlet control valve 21 and outlet control valve 22 all adopt to open and close the faster pneumatic butterfly valve of response, communicate each other through branch road pipe 31 between inlet control valve 21 front end and the outlet control valve 22 front end to be equipped with the pressure boost normally closed solenoid valve 32 that is used for controlling the break-make on the branch road pipe 31, be equipped with the pressure release normally closed solenoid valve 41 that is used for the pressure release drainage on the pipeline between inlet control valve 21 and the entrance point of being surveyed backflow preventer 10, be equipped with the flowmeter 50 that is used for detecting inverter pump 30 output flow on the pipeline between inverter pump 30 and the outlet control valve 22.
Specifically, when testing, supply water to the circulation test platform through inverter pump 30, cooperation inlet control valve 21, outlet control valve 22, pressure boost normally closed solenoid valve 32 and pressure release normally closed solenoid valve 41, the various operating modes of simulation quilt backflow preventer 10, and through detecting under different operating modes, the pressure value of each cavity in quilt backflow preventer 10, from in circulation test, judge whether the spare part in quilt backflow preventer 10 breaks down (specific test method sees the following), compare in prior art, through setting up multiunit control valve, the solenoid valve with lay pipeline network, thereby establish a test platform that is used for carrying out decompression type backflow preventer reliability test, solve the difficult problem of decompression type backflow preventer durability test, improve the product quality at design, the decompression type backflow preventer in the production process.
Furthermore, an inlet manual valve 61 is arranged on a pipeline between the inlet control valve 21 and the measured backflow preventer 10, an outlet manual valve 62 is arranged on a pipeline between the measured backflow preventer 10 and the outlet control valve 22, the branch pipe 31 is connected with the pipeline between the outlet manual valve 62 and the outlet control valve 22, and the inlet and the outlet of the measured backflow preventer 10 can be manually cut off by arranging the inlet manual valve 61 and the outlet manual valve 62.
Further, the circulating test platform comprises a remote control module 70 and a camera 71 used for monitoring the working condition of the circulating test platform of the pressure-reducing backflow preventer, wherein the control boxes of the inlet control valve 21, the outlet control valve 22, the inlet cavity pressure sensor 17, the middle cavity pressure sensor 18, the outlet cavity pressure sensor 19, the pressure-boosting normally closed electromagnetic valve 32, the pressure-relieving normally closed electromagnetic valve 41 and the variable frequency pump 30 are in communication connection with the remote control module 70, the running state of the circulating test platform can be monitored in real time by matching the remote control module 70 with the camera 71, and after the sensors are abnormal, detection personnel are notified by short messages or other alarm signals.
Further, still include circulating water pond 80, the frequency conversion pump 30 water inlet passes through the pipeline and is connected with circulating water pond 80, and the export control valve 22 other end passes through the pipeline and is connected with circulating water pond 80, and the water that flows through export control valve 22 flows back to circulating water pond 80 after, and the pump sending of frequency conversion pump 30 gets into the circulation test platform again, is equipped with backward flow control valve 81 on the pipeline between export control valve 22 and circulating water pond 80, after import control valve 21 and export control valve 22 broke down, can replace through entrance point manual valve 61, exit end manual valve 62 and backward flow control valve 81.
A pressure-reducing backflow preventer circulation test method adopts the pressure-reducing backflow preventer circulation test platform, and comprises the following steps:
step S1, starting the variable frequency pump 30, supplying water to the rear end of the variable frequency pump 30, judging whether the outlet pressure of the variable frequency pump 30 reaches a set value after the variable frequency pump 30 is kept started for 5S, if not, sending an alarm signal and stopping testing, and if so, executing the next step;
step S2, opening the inlet control valve 21 and the outlet control valve 22, and enabling the detected backflow preventer 10 to be in an open state;
step S3, after the inlet control valve 21 and the outlet control valve 22 are opened and a set time gap T1 is kept, respectively recording the detection pressure values P1, P2 and P3 of the inlet cavity pressure sensor 17, the intermediate cavity pressure sensor 18 and the outlet cavity pressure sensor 19 and the flow value of the flow meter 50, wherein the set range of the time gap T1 is 3-10S, in the embodiment, the time gap T1 is set to be 5S, and at the moment, P1 is more than P2 and more than P3;
step S4, closing the outlet control valve 22 and the inlet control valve 21 in sequence, and keeping the measured backflow preventer 10 in a closed state, namely keeping the measured backflow preventer 10 in a zero-flow state on the premise that the measured backflow preventer 10 is normal in function, wherein the inlet check valve 11 and the outlet check valve 12 are normally closed under the condition that the inlet check valve and the outlet check valve are not damaged;
step S5, after the outlet control valve 22 and the inlet control valve 21 are closed and the set time gap T2 is kept, respectively recording the detection pressure values P1', P2' and P3' of the inlet cavity pressure sensor 17, the intermediate cavity pressure sensor 18 and the outlet cavity pressure sensor 19, wherein the set range of the time gap T2 is 3-10S, and in the embodiment, the time gap T2 is set to 5S;
step S6, judging whether the attenuation quantity of the pressure difference value between P1 'and P2' relative to the pressure difference value between P1 and P2 is smaller than a limited attenuation quantity D1, if not, namely the inlet check valve 11 is possibly damaged, and the pressure difference between the middle cavity 15 and the inlet cavity 14 is reduced to exceed an allowable range, sending an alarm signal and stopping the test; judging whether the attenuation amount of the pressure difference value between P2 'and P3' relative to the pressure difference value between P2 and P3 is smaller than a limited attenuation amount D2, if not, namely the outlet check valve 12 is possibly damaged, and the pressure difference between the intermediate cavity 15 and the outlet cavity 16 is reduced to exceed an allowable range, sending an alarm signal and stopping the test, wherein the limited attenuation amount D1 and the limited attenuation amount D2 have the value range of 8-12%, and the limited attenuation amount D1 is the same as the limited attenuation amount D2, and in the embodiment, the limited attenuation amount D1 and the limited attenuation amount D2 have the value of 10%;
step S7, if the attenuation quantity of the pressure difference value between P1 'and P2' relative to the pressure difference value between P1 and P2 and the attenuation quantity of the pressure difference value between P2 'and P3' relative to the pressure difference value between P2 and P3 are respectively smaller than the limited attenuation quantity D1 and the limited attenuation quantity D2, namely the inlet check valve 11 and the outlet check valve 12 are in a normal working state, adjusting the working frequency of the variable frequency pump 30, and increasing the outlet pressure of the variable frequency pump 30 or keeping the initial outlet pressure of the variable frequency pump 30;
step S8, opening the normally closed booster solenoid valve 32, wherein the two ends of the normally closed booster solenoid valve 32 are respectively communicated with the front end of the inlet control valve 21 and the front end of the outlet control valve 22, namely the outlet end of the variable frequency pump 30 and the outlet cavity 16 of the detected backflow preventer 10, so that the pressure of the outlet cavity 16 is rapidly increased, thereby simulating a water hammer effect, detecting whether the outlet check valve 12 can normally work under the influence of the water hammer effect by simulating the water hammer effect, and simultaneously, the pressure of the intermediate cavity 15 is rapidly increased due to the rapid closing of the outlet check valve 12, if the pressure of the intermediate cavity 15 is close to the pressure of the inlet cavity 14, the drain valve 13 is immediately opened, so that the pressure of the intermediate cavity 15 is reduced, wherein the water hammer effect can be enhanced by adjusting the working frequency of the variable frequency pump 30 and increasing the outlet pressure of the variable frequency pump 30, thereby testing whether the outlet check valve 12 can adapt to worse working conditions;
step S9, after the pressure-increasing normally closed solenoid valve 32 is opened, a set time gap T3 is kept, whether the pressure of the middle cavity 15 is kept unchanged or not is judged, the pressure keeping unchanged is directed at the pressure value of the middle cavity 15 after the pressure-increasing normally closed solenoid valve 32 is opened, and the judgment result is prevented from being influenced by pressure fluctuation caused by rapid closing of the outlet check valve 12 by setting the time gap T3, wherein the set range of the time gap T3 is 3-10S, if not, an alarm signal is sent out, the test is stopped, and in the embodiment, the time gap T3 is set to be 5S;
step S10, if the pressure of the intermediate cavity 15 is kept unchanged, namely the outlet check valve 12 works normally, the pressure relief normally closed electromagnetic valve 41 is opened to simulate pipe explosion of a front-end water supply pipe network, so that the pressure of the inlet cavity 14 is reduced, the pressure of the intermediate cavity 15 is greater than the pressure of the inlet cavity 14, the drain valve 13 of the measured backflow preventer 10 is triggered and opened to discharge water in the intermediate cavity 15, and the water in the intermediate cavity 15 cannot flow back to the inlet cavity 14;
s11, adjusting the working frequency of the variable frequency pump 30 to enable the outlet pressure of the variable frequency pump 30 to return to the initial outlet pressure;
step S12, adding 1 to the cycle cumulative number;
and S13, judging whether the cycle cumulative number reaches a set value, if not, recovering the initial state of all the valve bodies, and repeating the steps S1 to S13, and if the cycle cumulative number reaches the set value, ending the test.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. The utility model provides a decompression type backflow preventer circulation test platform which characterized in that includes:
the backflow preventer (10) is characterized in that an inlet cavity (14), an intermediate cavity (15) and an outlet cavity (16) of the backflow preventer (10) are respectively provided with an inlet cavity pressure sensor (17), an intermediate cavity pressure sensor (18) and an outlet cavity pressure sensor (19);
an inlet control valve (21) which is connected with the inlet end of the measured backflow preventer (10) through a pipeline and is used for controlling the water inlet of the inlet end of the measured backflow preventer (10);
the outlet control valve (22) is connected with the outlet end of the measured backflow preventer (10) through a pipeline and is used for controlling the water outlet of the outlet end of the measured backflow preventer (10);
the water outlet of the variable frequency pump (30) is connected with the other end of the inlet control valve (21) through a pipeline;
communicate each other through bypass pipe (31) between import control valve (21) front end and outlet control valve (22) front end to be equipped with pressure boost normally closed solenoid valve (32) that are used for controlling the break-make on bypass pipe (31), be equipped with pressure release normally closed solenoid valve (41) that are used for the pressure release drainage on the pipeline between import control valve (21) and the entrance point of surveyed backflow preventer (10), be equipped with flowmeter (50) on the pipeline between frequency conversion pump (30) and outlet control valve (22).
2. The pressure-reducing backflow preventer cycle test platform of claim 1, wherein the inlet control valve (21) and the outlet control valve (22) are each a pneumatic butterfly valve.
3. The circulation testing platform for pressure-reducing backflow preventers according to claim 1, characterized in that an inlet manual valve (61) is arranged on the pipeline between the inlet control valve (21) and the backflow preventer to be tested (10), an outlet manual valve (62) is arranged on the pipeline between the backflow preventer to be tested (10) and the outlet control valve (22), and the bypass pipe (31) is connected with the pipeline between the outlet manual valve (62) and the outlet control valve (22).
4. The pressure-reducing backflow preventer circulation test platform according to claim 1, further comprising a remote control module (70) and a camera (71), wherein control boxes of the inlet control valve (21), the outlet control valve (22), the inlet chamber pressure sensor (17), the intermediate chamber pressure sensor (18), the outlet chamber pressure sensor (19), the pressurization normally closed solenoid valve (32), the pressure-relief normally closed solenoid valve (41) and the variable frequency pump (30) are all in communication connection with the remote control module (70).
5. The pressure-reducing backflow preventer circulation test platform according to claim 4, further comprising a circulation water tank (80), wherein a water inlet of the variable frequency pump (30) is connected with the circulation water tank (80) through a pipeline, the other end of the outlet control valve (22) is connected with the circulation water tank (80) through a pipeline, and a backflow control valve (81) is arranged on the pipeline between the outlet control valve (22) and the circulation water tank (80).
6. A method for circularly testing a pressure-reducing backflow preventer, which is characterized by adopting the circular testing platform of the pressure-reducing backflow preventer as claimed in any one of claims 1 to 5, and comprises the following steps:
step S1, starting a variable frequency pump (30), and supplying water to the rear end of the variable frequency pump (30);
s2, opening an inlet control valve (21) and an outlet control valve (22), and enabling the detected backflow preventer (10) to be in an open state;
s3, respectively recording detection pressure values P1, P2 and P3 of an inlet cavity pressure sensor (17), an intermediate cavity pressure sensor (18) and an outlet cavity pressure sensor (19) and flow values of a flowmeter (50);
s4, closing the outlet control valve (22) and the inlet control valve (21) in sequence, and enabling the measured backflow preventer (10) to be in a closed state, namely enabling the measured backflow preventer (10) to be in a zero-flow state;
s5, respectively recording detection pressure values P1', P2' and P3' of an inlet cavity pressure sensor (17), an intermediate cavity pressure sensor (18) and an outlet cavity pressure sensor (19);
step S6, judging whether the attenuation quantity of the pressure difference value between P1 'and P2' relative to the pressure difference value between P1 and P2 is less than a limited attenuation quantity D1, if not, sending an alarm signal and stopping the test; judging whether the attenuation quantity of the pressure difference value between P2 'and P3' relative to the pressure difference value between P2 and P3 is less than a limited attenuation quantity D2 or not, if not, sending an alarm signal and stopping the test;
s7, if the attenuation amount of the pressure difference value is smaller than the limited attenuation amount D1 and the limited attenuation amount D2 respectively, adjusting the working frequency of the variable frequency pump (30), and increasing the outlet pressure of the variable frequency pump (30) or keeping the initial outlet pressure of the variable frequency pump (30);
s8, opening a pressurizing normally closed electromagnetic valve (32) to rapidly increase the pressure of an outlet cavity (16);
s9, judging whether the pressure of the middle cavity (15) is kept unchanged, if not, sending an alarm signal and stopping the test;
step S10, if the pressure of the middle cavity (15) is kept unchanged, the pressure relief normally closed electromagnetic valve (41) is opened, the pressure of the inlet cavity (14) is reduced, and the drain valve (13) of the measured backflow preventer (10) is opened;
s11, adjusting the working frequency of the variable frequency pump (30) to enable the outlet pressure of the variable frequency pump (30) to return to the initial outlet pressure;
step S12, adding 1 to the cycle cumulative number;
and S13, judging whether the cycle cumulative number reaches a set value, if not, repeating the steps S1 to S13, and if the cycle cumulative number reaches the set value, ending the test.
7. The pressure-reducing backflow preventer cycle test method according to claim 6, wherein in step S3, after the inlet control valve (21) and the outlet control valve (22) are opened and a set time gap T1 is maintained, the detected pressure values P1, P2, P3 of the inlet chamber pressure sensor (17), the intermediate chamber pressure sensor (18), and the outlet chamber pressure sensor (19), and the flow rate value of the flow meter (50) are recorded, respectively, wherein the set range of the time gap T1 is 3-10S.
8. The pressure-reducing backflow preventer cycle test method according to claim 6, wherein in step S5, after the outlet control valve (22) and the inlet control valve (21) are closed and a set time gap T2 is maintained, the detected pressure values P1', P2', P3' of the inlet chamber pressure sensor (17), the intermediate chamber pressure sensor (18), and the outlet chamber pressure sensor (19) are recorded, respectively, wherein the set range of the time gap T2 is 3-10S.
9. The method of claim 6, wherein in step 9, after the normally closed solenoid valve (32) is opened and a predetermined time interval T3 is maintained, it is determined whether the pressure in the intermediate chamber (15) is maintained, wherein the predetermined time interval T3 is set within a range of 3-10s.
10. The method for cyclically testing a pressure-reducing type backflow preventer according to claim 6, wherein the limited attenuation amount D1 and the limited attenuation amount D2 have a value ranging from 8% to 12%, and the limited attenuation amount D1 is the same as the limited attenuation amount D2;
and in the step S1, after the variable frequency pump (30) is kept started to a set time gap, judging whether the outlet pressure of the variable frequency pump (30) reaches a set value, if not, sending an alarm signal and stopping the test, and if so, executing the step S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211254465.0A CN115901200A (en) | 2022-10-13 | 2022-10-13 | Pressure-reduction backflow preventer circulation test platform and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211254465.0A CN115901200A (en) | 2022-10-13 | 2022-10-13 | Pressure-reduction backflow preventer circulation test platform and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115901200A true CN115901200A (en) | 2023-04-04 |
Family
ID=86473416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211254465.0A Pending CN115901200A (en) | 2022-10-13 | 2022-10-13 | Pressure-reduction backflow preventer circulation test platform and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115901200A (en) |
-
2022
- 2022-10-13 CN CN202211254465.0A patent/CN115901200A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101657670B (en) | Apparatus and method for wellhead high integrity protection system | |
| CN101696641B (en) | Electronically controllable and testable turbine trip system | |
| EA015299B1 (en) | Wellhead flowline protection and testing system with esp speed controller and emergency isolation valve | |
| CN202814687U (en) | High temperature pulse integrated test system of motor vehicle bake hose | |
| US6535827B1 (en) | Method and apparatus for detecting and isolating a rupture in fluid distribution system | |
| DE102004016378A1 (en) | Method and arrangement for active monitoring of pipelines | |
| MX2013004432A (en) | Clustered wellhead trunkline protection and testing system with esp speed controller and emergency isolation valve. | |
| CN201438168U (en) | Testing machine for hose pulse and temperature characteristics | |
| CN102220965B (en) | Electric control safety system for slurry pump | |
| CN205364455U (en) | Detection apparatus for die casting die cooling system | |
| DE3904487C1 (en) | ||
| US5218859A (en) | Method and apparatus for monitoring a conduit system for an incompressible fluid for leaks | |
| CN103038449B (en) | Control device and method for an combined bracket in the work face of a mine | |
| CN115901200A (en) | Pressure-reduction backflow preventer circulation test platform and test method | |
| CN104697759A (en) | Pressure switch service life test tooling | |
| CN217385133U (en) | Filter element reliability testing device | |
| CN110231779A (en) | A kind of underwater complete electric production tree system analogy method | |
| CN108119351A (en) | A kind of three screw pump type experimental rig for hydraulic turbine control system | |
| CN211262693U (en) | Anti-freezing valve service life detection system | |
| CN2303963Y (en) | Oil-leakage monitoring alarming device for use under pressure-maintaining condition | |
| KR20140131097A (en) | A Test Block Apparatus For Solenoid Valve And A Test Method Using Of It | |
| CN210218888U (en) | On-line monitoring backflow preventer | |
| CN108801575B (en) | Hydraulic drive type clamping special-shaped valve bursting pressure testing method | |
| CN106865694A (en) | The detection method and filtration system of filtration system | |
| KR20090034181A (en) | Boundary area flowing control device having the function obliterating remaining water for tap water pipeline supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |