CN111551360B - Method for testing dynamic characteristics of manual and electric closed valve - Google Patents
Method for testing dynamic characteristics of manual and electric closed valve Download PDFInfo
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- CN111551360B CN111551360B CN202010584192.0A CN202010584192A CN111551360B CN 111551360 B CN111551360 B CN 111551360B CN 202010584192 A CN202010584192 A CN 202010584192A CN 111551360 B CN111551360 B CN 111551360B
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Abstract
The invention discloses a method for testing the dynamic characteristics of a manual and electric closed valve, which comprises the steps of installing a tested manual and electric closed valve on a ventilation pipeline, arranging a static pressure box on the ventilation pipeline, feeding high-pressure gas into the static pressure box, enabling the high-pressure gas to impact a valve plate of the tested manual and electric closed valve from the front side of a second port of the tested manual and electric closed valve, and obtaining the air leakage amount of the tested manual and electric closed valve when the valve plate impacts from the front side after the tested manual and electric closed valve is closed; and discharging the high-pressure gas in the static pressure box, feeding the high-pressure gas into the first port of the manual and electric closed valve from the ventilating pipeline, re-inflating the static pressure box, and after the tested manual and electric closed valve is closed, acquiring the resistance coefficient when the tested manual and electric closed valve is closed. The invention tests the dynamic performance of the tested manual and electric closed valve, and the air leakage and the resistance coefficient of the tested manual and electric closed valve are measured in the test, thereby judging the sealing performance of the tested manual and electric closed valve.
Description
Technical Field
The invention belongs to the technical field of civil air defense quality detection, and particularly relates to a method for testing dynamic characteristics of a manual and electric closed valve.
Background
In the construction process of civil air defense basements, various types of protection engineering equipment need to be installed, the tightness of the protection engineering (including civil air defense engineering and national air defense engineering) equipment is the basis of engineering protection, wherein an air inlet and exhaust system of the engineering is connected with channels inside and outside the engineering, according to protection requirements, a part of air pipes of the air inlet and exhaust system in the protection engineering are embedded in a protection structure of the engineering, a sealing valve is installed in a pipeline and is difficult to carry out field detection on the tightness of the sealing valve, the sealing valve is used for the task of the tightness of the engineering, the current main method only carries out sampling detection on the sealing valve (a sending detection mechanism) of a ventilation system, the detection means and the detection equipment for the sealing valve are fewer, the sealing valve is not subjected to special air tightness detection in the ventilation system, the safety condition in the use process is difficult to be effectively guaranteed, the sealing valve has larger hidden danger in the use, and the construction quality of the ventilation system is kept closed (if the tightness of the connection position of the valve and the pipeline cannot be detected), so that the tightness of the ventilation system cannot be guaranteed
Disclosure of Invention
The invention aims to provide a method for testing the dynamic characteristics of a manual and electric closed valve. In order to achieve the purpose, the invention adopts the following technical effects:
according to one aspect of the invention, a method for testing the dynamic characteristics of the manual and electric closed valve is provided, and the method comprises the steps of mounting the manual and electric closed valve to be tested on a ventilation pipeline, arranging a static pressure box on the ventilation pipeline, feeding high-pressure gas into the static pressure box, enabling the high-pressure gas to impact a valve plate of the manual and electric closed valve to be tested from the front side of a second port of the manual and electric closed valve to be tested, and obtaining the air leakage amount when the valve plate of the manual and electric closed valve is impacted from the front side after the manual and electric closed valve to be tested is closed; and discharging the high-pressure gas in the static pressure box, feeding the high-pressure gas into the first port of the manual and electric closed valve from the ventilating pipeline, re-inflating the static pressure box, and after the tested manual and electric closed valve is closed, acquiring the resistance coefficient when the tested manual and electric closed valve is closed.
In a further preferred embodiment of the above-mentioned solution, the first port of the manual/electric sealing valve is communicated with the ventilation duct through a left reducer pipe, the second port of the manual/electric sealing valve is communicated with the static pressure box through a right reducer pipe, and when the manual/electric sealing valve to be measured is in a fully opened state, high-pressure gas is fed into the static pressure box for inflation, the manual/electric sealing valve to be measured is gradually closed, so that the high-pressure gas fed into the static pressure box impacts the valve plate of the manual/electric sealing valve to be measured in a front direction, and after the manual/electric sealing valve to be measured is fully closed, the amount of leakage caused by the front impact of the manual/electric sealing valve to be measured is obtained; discharging high-pressure gas in the static pressure box, completely opening the tested manual and electric closed valve, sending the high-pressure gas into a first port of the manual and electric closed valve from the ventilation pipeline, re-inflating the static pressure box, gradually closing a valve plate of the tested manual and electric closed valve, stopping the sent high-pressure gas when the tested manual and electric closed valve is closed, and obtaining a resistance coefficient when the tested manual and electric closed valve is closed after the tested manual and electric closed valve is completely closed.
Preferably, the test method further comprises the steps of discharging part of high-pressure gas in the static pressure box, reducing the pressure in the static pressure box, adjusting the ventilation rate of the ventilation pipeline to increase the pressure of the first port of the manual and electric closed valve, waiting for 5min to 30min, obtaining the air leakage amount when the valve plate of the manual and electric closed valve is impacted in the front face, and obtaining the resistance coefficient when the manual and electric closed valve is closed.
Preferably, the air leakage amount L is smaller than the air leakage amount LqSatisfies the following conditions:
wherein L isqIs the air leakage quantity delta P of the tested manual and electric closed valve1＝P1-B，P1The pressure intensity of the air pressure in the duration time of the static pressure box, V is the volume of the space where the air is located, B is the current atmospheric pressure intensity, and t is the duration time of the positive impact;
the drag coefficient satisfies:
ΔP2is the local pressure intensity, delta P, in the ventilation duct2＝P2-B，P2The pressure intensity of the air pressure in the static pressure box in the duration time is shown, rho is the current air density, and v is the pressure intensity of the manually-operated closed valveAverage wind speed, and ν satisfies:
q is the rated air quantity of the manual and electric closed valve, and D is the inner diameter of the manual and electric closed valve.
In a further preferred embodiment of the above-mentioned solution, the step of gradually closing the electric sealing valve of the measured torch is manual closing, or the step of electrically gradually closing the valve plate of the electric sealing valve of the measured torch is executed; and after the tested manual and electric closed valve is completely closed, waiting for at least 1min to 10min to obtain the air leakage amount when the front surface of the tested manual and electric closed valve is impacted.
In a further preferred embodiment of the above scheme, the top end of the static pressure box is provided with an exhaust valve and a first air pipe respectively, one end of the first air pipe is communicated with the inside of the static pressure box, the other end of the first air pipe is provided with an air compressor, the air compressor is communicated with the static pressure box through the first air pipe, the side part of the static pressure box is provided with a U-shaped pressure gauge, and the U-shaped pressure gauge is communicated with the side part of the static pressure box through a branch air pipe.
In a further preferred embodiment of the above-mentioned solution, a first air inlet control valve and a second air inlet control valve are disposed on the end portion of the first air delivery pipe near both ends, and a third control valve is disposed on the branch air pipe.
Above-mentioned scheme is further preferred be provided with first pressure gauge on the outer wall of right reducing pipe, this first pressure gauge is used for detecting the atmospheric pressure size in the reducing pipe of right side.
Above-mentioned scheme is further preferred the entry end of air pipe is provided with the ventilation blower, has set gradually flow control valve and air flowmeter on the air pipe between along ventilation blower and left reducing pipe, is provided with the second pressure gauge on the outer wall of left reducing pipe, and this second pressure gauge is used for detecting the atmospheric pressure size in the left reducing pipe.
In summary, because the invention adopts the above technical scheme, the invention has the following technical effects: the static pressure box is stamped by the air compressor and the ventilator, the pressure of the static pressure box is balanced after waiting for a period of time, the dynamic performance test of the tested manual and electric closed valve is completed by detecting the air pressure change state in the static pressure box, the air leakage and the resistance coefficient of the tested manual and electric closed valve are measured by the test, and the tightness of the tested manual and electric closed valve is judged, so that the protection capability of the closed valve of the ventilation system can be ensured, the test can be carried out quickly and conveniently, meanwhile, the air tightness of the civil air defense equipment in the ventilation system can be detected, and the device has the characteristics of accuracy in test, high efficiency and convenience in operation.
Drawings
FIG. 1 is a schematic diagram of a test structure of a method for testing dynamic characteristics of a manual/electric closed valve;
in the drawing, a tested electric-driven closed valve 1, a ventilating duct 2, a static pressure box 3, an air compressor 4,U type pressure gauge 5, a ventilator 6, a left reducer 20, a right reducer 21, a flow control valve 23, a first pressure gauge 22, an air flow gauge 24, a second pressure gauge 25, an exhaust valve 30, a first air pipe 31, a first air inlet control valve 32, a second air inlet control valve 33, a branch air pipe 50 and a third control valve 51.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the specification are merely intended to provide a thorough understanding of one or more aspects of the invention, which may be practiced without these specific details.
As shown in fig. 1, according to another aspect of the invention, the invention provides a method for testing the dynamic characteristics of a manual/electric sealing valve, the method comprises the steps of installing a tested manual/electric sealing valve 1 on a ventilation pipeline 2, arranging a static pressure box 3 on the ventilation pipeline 2, feeding high-pressure gas into the static pressure box 3, enabling the high-pressure gas to impact a valve plate of the tested manual/electric sealing valve from the front side of a second port of the tested manual/electric sealing valve 1, and obtaining the air leakage amount when the valve plate of the tested manual/electric sealing valve 1 impacts from the front side after the tested manual/electric sealing valve 1 is closed; discharging high-pressure gas in the static pressure box 3, feeding the high-pressure gas into the first port of the manual-electric closed valve 1 from the ventilating duct 2, re-inflating the static pressure box 3, and obtaining a resistance coefficient when the manual-electric closed valve 1 to be measured is closed; in the invention, a first port of the manual and electric closed valve 1 is communicated with a ventilation pipeline 2 through a left reducer pipe 20, a second port of the manual and electric closed valve 1 is communicated with a static pressure box 3 through a right reducer pipe 21, when the manual and electric closed valve 1 to be measured is in a completely opened state, high-pressure gas is fed into the static pressure box 3 for inflation, the manual and electric closed valve 1 to be measured is gradually closed, so that the high-pressure gas fed into the static pressure box 3 impacts a valve plate of the manual and electric closed valve to be measured in a front direction, and after the manual and electric closed valve 1 to be measured is completely closed, the air leakage amount of the manual and electric closed valve to be measured in the front direction is obtained; discharging high-pressure gas in the static pressure box 3, completely opening the tested manual and electric closed valve 1, feeding the high-pressure gas into a first port of the manual and electric closed valve 1 from the ventilating pipeline 2, re-inflating the static pressure box 3, gradually closing a valve plate of the tested manual and electric closed valve 1, so that the fed high-pressure gas prevents the tested manual and electric closed valve from being closed, obtaining a resistance coefficient when the tested manual and electric closed valve is closed after the tested manual and electric closed valve 1 is completely closed, and gradually closing the tested manual and electric closed valve or performing electric gradual closing of the valve plate of the tested manual and electric closed valve; and after the tested manual/electric closed valve 1 is completely closed and waits for at least 1min to 10min, the air leakage amount during the front impact of the tested manual/electric closed valve is obtained by reading the parameters of each detection component.
The invention provides a system for the dynamic characteristics of a manual and electric closed valve, which comprises a tested manual and electric closed valve 1, a ventilating duct 2, a static pressure box 3, an air compressor 4 and a ventilator 6, wherein a first port of the manual and electric closed valve 1 is communicated with the ventilating duct 2 through at least one left reducing pipe 20, a second port of the manual and electric closed valve 1 is communicated with the static pressure box 3 through at least one right reducing pipe 21, the ventilator 6 is arranged at the inlet end of the ventilating duct 2, a vent valve 30 and a first air pipe 31 are respectively arranged at the top end of the static pressure box 3, one end of the first air pipe 31 is communicated in the static pressure box 3, the other end of the first air pipe 31 is provided with the air compressor 4, the air compressor 4 is communicated with the static pressure box 3 through the first air pipe 31, high-pressure air is fed into the static pressure box 3 through the air compressor 4 for inflation, the exhaust valve 30 is in a closed state, the high-pressure gas sent by the air compressor 4 is sent into the static pressure box 3 along the first gas pipe 31, a U-shaped pressure gauge 5 is arranged on the side part of the static pressure box 3, the U-shaped pressure gauge 4 is communicated with the side part of the static pressure box 3 through a branch gas pipe 50, the U-shaped pressure gauge 5 is used for detecting the change condition of the gas pressure in the static pressure box 3, a first gas inlet control valve 32 and a second gas inlet control valve 33 are arranged on the end parts of the first gas pipe 31 close to the two ends, a third control valve 51 is arranged on the branch gas pipe 50, the air compressor 4 sends the high-pressure gas into the static pressure box 3 through the first gas pipe 31, when the gas pressure in the static pressure box 3 reaches a specified pressure, the first gas inlet control valve 32, the second gas inlet control valve 33 and the third control valve 51 are closed in sequence, so that the static pressure box 3 is in a relatively static closed pressure space, the pressure intensity in the static pressure box 3 is not less than 2500Pa, and the temperature change of the internal environment and the external environment is not more than 3 ℃; a first pressure gauge 22 is provided on the outer wall of the right reducer pipe 21, and the first pressure gauge 22 is used for detecting the air pressure inside the right reducer pipe 21 and detecting the sealing pressure (pressure) inside the static pressure box 3 through the first pressure gauge 22.
In the present invention, a flow control valve 23 and an air flow meter 24 are sequentially provided along the ventilation duct 2 between the ventilator 6 and the left reducing pipe 20, a second pressure gauge 25 is provided on the outer wall of the left reducing pipe 20, the second pressure gauge 25 is used for detecting the air pressure in the left reducing pipe 20, the flow control valve 23 is used for adjusting and controlling the air flow sent to the manual/electric-operated sealing valve 1, and the air flow meter 24 is used for detecting the air flow flowing into the left reducing pipe 20.
In the present invention, the amount of air leakage L isqSatisfies the following conditions:
wherein L isqIs the air leakage quantity delta P of the tested manual and electric closed valve1＝P1-B，P1Is the pressure of the air pressure (in Pa) in the static pressure tank 3 for the duration of time, P being measured1The pressure of the gas in the static pressure box 3 under the sealing condition after the gas reaches the rated pressure, and V is the volume of the space (m) in which the gas is positioned3) When the tested manual-electric closed valve 1 is closed, the current atmospheric pressure B is the gas pressure in the ventilation pipeline 2 under the normal standard atmospheric pressure condition, and t is the duration time (in the unit of s) of the frontal impact; in the invention, the high-pressure gas sent by the air compressor 4 has the pressure P within the duration time of the static pressure box 3 in the time period of 1-10 min of static pressure box 31For values read between the first pressure gauges 22, or by reading the pressure values P of the first pressure gauges 22, respectively01And the pressure value P of the U-shaped manometer 502At this time P1＝(P01+P02) 2, i.e. P1Is the pressure value P of the first pressure gauge 2201And the pressure value P of the U-shaped manometer 502Thereby more accurately obtaining the gas pressure, P, in the plenum chamber 31The difference with B is the static pressure value delta P continuously in the static pressure box 31Thus, during the sustained rest time, the static pressure value Δ P1The degree of change of the pressure difference reflects the air leakage of the tested manual and electric sealing valve 1, so that the sealing performance of the manual and electric sealing valve can be judged.
The resistance coefficient ζ satisfies:
ΔP2is the local pressure (in Pa) in the ventilation duct 2, Δ P2＝P2-B1，P2Is the air pressure in the static pressure box 3 for the duration, B1 is the air pressure of the rated air volume in the current ventilation pipeline 2, and rho is the current air density (in kg/m)3) And v is throughThe average wind speed (unit is m/s) of the manual-electric closed valve is met, and v is as follows:
wherein Q is the rated air quantity of the manual and electric closed valve, and D is the inner diameter (unit is m) of the manual and electric closed valve. The resistance coefficient of the manual and electric closed valve is large, which indicates that the sealing performance of the closed valve is good, otherwise, the sealing performance is poor, and the tightness of the manual and electric closed valve is better.
In the invention, with reference to fig. 1, the test method further includes discharging a part of the high-pressure gas in the static pressure box 3 through the exhaust valve 30, when the high-pressure gas is fed into the first port of the manual/electric sealing valve 1 from the ventilation duct 2, re-inflating the static pressure box 3, gradually closing the manual/electric sealing valve 1 to be tested, detecting an air leakage amount during front impact of the manual/electric sealing valve 1 to be tested when the manual/electric sealing valve 1 is in a closed state, then discharging a part of the high-pressure gas through the exhaust valve 30 to reduce pressure reduction in the static pressure box 3, wherein the pressure is not lower than 1000Pa, adjusting the ventilation volume of the ventilation duct 2, increasing the air flow fed by the ventilator 6 through adjusting the flow control valve 23 to enable zeta atmospheric pressure in the ventilation duct 2 to be greater than pressure of the gas in the static pressure box 3, and at this time, the pressure of the first port of the manual/electric sealing valve is increased, and delta P in the resistance coefficient formula is increased2＝∣P2-B1∣，ΔP2For the absolute pressure, in the process of increasing the gas pressure B1 of the rated air volume in the current ventilation duct 2, the gas pressure B1 may be greater than the air pressure in the static pressure box 3 for a duration time, wait for 5min to 30min, keep the pressure in the static pressure box 3 in a balanced state, detect whether the pressure (pressure) in the static pressure box 3 changes, obtain the resistance coefficient when the detected electric-operated airtight valve is closed, and obtain the air leakage when the valve plate of the detected electric-operated airtight valve 1 is impacted in the front face, therefore, the resistance of the gas passing through the airtight valve will increase, the air leakage will be smaller, and the sealing performance of the airtight valve will be better.
The foregoing is only a preferred embodiment of the invention and it should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the invention and should be considered as within the scope of the invention.
Claims (5)
1. A method for testing the dynamic characteristics of a manual and electric closed valve is characterized by comprising the following steps: the testing method comprises the steps that a tested manual and electric closed valve is installed on a ventilation pipeline, a static pressure box is arranged on the ventilation pipeline, high-pressure gas is fed into the static pressure box, the high-pressure gas impacts a valve plate of the tested manual and electric closed valve from the front side of a second port of the tested manual and electric closed valve, and after the tested manual and electric closed valve is closed, the air leakage amount of the tested manual and electric closed valve when the front side of the valve plate impacts is obtained; discharging high-pressure gas in the static pressure box, feeding the high-pressure gas into the first port of the manual and electric closed valve from the ventilating pipeline, re-inflating the static pressure box, and obtaining a resistance coefficient when the manual and electric closed valve to be measured is closed after the manual and electric closed valve to be measured is closed;
the first port of the manual-electric closed valve is communicated with the ventilation pipeline through a left reducing pipe, the second port of the manual-electric closed valve is communicated with the static pressure box through a right reducing pipe, the top end of the static pressure box is respectively provided with an exhaust valve and a first gas pipe, one end of the first gas pipe is communicated in the static pressure box, the other end of the first gas pipe is provided with an air compressor, the air compressor is communicated with the static pressure box through the first gas pipe, the side part of the static pressure box is provided with a U-shaped pressure gauge, the U-shaped pressure gauge is communicated on the side part of the static pressure box through a branch gas pipe, the outer wall of the right reducing pipe is provided with a first pressure gauge, the first pressure gauge is used for detecting the air pressure in the right reducing pipe, the outer wall of the left reducing pipe is provided with a second pressure gauge, and the second pressure gauge is used for detecting the air pressure in the left reducing pipe; the test process is carried out according to the following steps: when the tested manual and electric sealing valve is in a fully opened state, high-pressure gas is fed into the static pressure box for inflation, and the tested manual and electric sealing valve is gradually closed to ensure that the high-pressure gas fed into the static pressure boxThe valve plate of the tested manual and electric closed valve is impacted by the front surface of the body, and air leakage during the front impact of the tested manual and electric closed valve is obtained after the tested manual and electric closed valve is completely closed; discharging high-pressure gas in the static pressure box, completely opening the tested manual and electric closed valve, feeding the high-pressure gas into a first port of the manual and electric closed valve from the ventilating pipeline, re-inflating the static pressure box, gradually closing a valve plate of the tested manual and electric closed valve, and enabling the fed high-pressure gas to prevent the tested manual and electric closed valve from being closed; the air leakage LqSatisfies the following conditions:
wherein L isqIs the air leakage quantity delta P of the tested manual and electric closed valve1＝P1-B，P1The difference value between B and B is the continuous static pressure value delta P in the static pressure box1；P1The average pressure intensity in the static pressure box in the duration time, V is the volume of the space where the gas is located, B is the current atmospheric pressure, and t is the duration time of the front impact; the drag coefficient satisfies:
ΔP2is the local pressure intensity, delta P, in the ventilation duct2＝P2-B，P2For the air pressure intensity in the duration time in the static pressure box, rho is the current air density, v is the average air speed of the manual and electric closed valve, and v meets the following requirements:
wherein Q is the rated air quantity of the manual and electric closed valve, and D is the inner diameter of the manual and electric closed valve.
2. The method for testing the dynamic characteristic of the manual and electric closed valve according to claim 1, is characterized in that: the testing method further comprises the steps of discharging part of high-pressure gas in the static pressure box, reducing the pressure intensity in the static pressure box, adjusting the ventilation rate of the ventilation pipeline, enabling the pressure intensity of the first port of the manual and electric closed valve to be increased, waiting for 5min to 30min, obtaining the air leakage rate when the valve plate of the manual and electric closed valve to be tested is impacted in the front face, and obtaining the resistance coefficient when the manual and electric closed valve to be tested is closed.
3. The method for testing the dynamic characteristic of the manual and electric closed valve according to claim 1, is characterized in that: the gradual closing of the tested manual electric closed valve is manual closing, or the valve plate of the tested manual electric closed valve is electrically and gradually closed; and after the tested manual and electric closed valve is completely closed, waiting for at least 1min to 10min to obtain the air leakage amount when the front surface of the tested manual and electric closed valve is impacted.
4. The method for testing the dynamic characteristic of the manual and electric closed valve according to claim 1, is characterized in that: the end part of the first gas transmission pipe close to the two ends is provided with a first gas inlet control valve and a second gas inlet control valve, and the branch gas pipe is provided with a third control valve.
5. The method for testing the dynamic characteristic of the manual and electric closed valve according to claim 1, is characterized in that: the inlet end of the ventilation pipeline is provided with a ventilator, and a flow control valve and an air flow meter are sequentially arranged on the ventilation pipeline between the ventilator and the left reducer pipe.
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| CN102879157A (en) * | 2012-10-19 | 2013-01-16 | 中国人民解放军理工大学 | Airtightness detection method for protective engineering ventilation system and system thereof |
| CN103954441A (en) * | 2014-04-25 | 2014-07-30 | 武汉工程大学 | Device and method for detecting and testing high-temperature valve based on air heating system |
| CN104122052A (en) * | 2014-07-31 | 2014-10-29 | 南京诺德斯智能科技有限公司 | Airtight valve airtightness detection platform |
| CN204008108U (en) * | 2014-07-31 | 2014-12-10 | 南京诺德斯智能科技有限公司 | Antiexplosive overpressure air exhaust valve ventilation kinematic behavior detection platform |
| CN105300614B (en) * | 2015-11-25 | 2018-07-13 | 江南工业集团有限公司 | A kind of automobile-used LNG gas cylinders multifunction valve test system and test method |
| CN108956054A (en) * | 2018-07-17 | 2018-12-07 | 江苏安泰安全技术有限公司 | A kind of relief valve device and working method with self-checking function |
| CN109990971B (en) * | 2019-04-01 | 2020-08-18 | 辽宁工程技术大学 | Pressure-variable wind resistance determination experimental device and method |
| CN210108647U (en) * | 2019-06-28 | 2020-02-21 | 北方测盟科技有限公司 | Comprehensive detection equipment for sealing performance and ventilation performance of valve |
| CN210464910U (en) * | 2019-10-29 | 2020-05-05 | 广西永高机械设备检测有限公司 | Exhaust valve detection mechanism |
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