CN111122151A - Breathing valve flow testing device and testing method thereof - Google Patents
Breathing valve flow testing device and testing method thereof Download PDFInfo
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- CN111122151A CN111122151A CN202010123163.4A CN202010123163A CN111122151A CN 111122151 A CN111122151 A CN 111122151A CN 202010123163 A CN202010123163 A CN 202010123163A CN 111122151 A CN111122151 A CN 111122151A
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- 238000012360 testing method Methods 0.000 title claims abstract description 79
- 230000029058 respiratory gaseous exchange Effects 0.000 title claims description 23
- 230000000241 respiratory effect Effects 0.000 claims abstract description 22
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Abstract
The invention discloses a respiratory valve flow testing device, which comprises a closed cavity, wherein the cavity is divided into an upper cavity and a lower cavity by a partition plate, the partition plate is provided with a first mounting hole for mounting a respiratory valve to be tested, and the cavity performs air intake and air exhaust on the cavity by a ventilation system so as to complete testing; the ventilation system comprises a first air inlet system communicated with the upper cavity and a first exhaust system communicated with the lower cavity, and the first air inlet system and the first exhaust system are synchronously ventilated in the test process. The invention also discloses a method for testing the flow of the breather valve of the device for testing the flow of the breather valve, through a first air inlet system and a first exhaust system which are synchronously ventilated, the upper chamber in the device for testing is simultaneously filled with air and exhausted from the lower chamber, so that the pressure of the upper chamber is always greater than that of the lower chamber, the pressure of the upper and lower streams of the working environment of the breather valve is ensured to be relatively stable while positive pressure is utilized to simulate negative pressure, large fluctuation of the pressure in the testing process is avoided, the reading of a flow meter is accurate, and the testing repeatability is good.
Description
Technical Field
The invention relates to a device for testing the inhalation performance of a storage tank breather valve of products such as petroleum, chemical engineering and the like, in particular to a device for testing the flow of the breather valve and a testing method thereof.
Background
The breather valve is a valve which can ensure that the space of the storage tank is isolated from the atmosphere within a certain pressure range and can be communicated with the atmosphere when the pressure exceeds or is lower than the pressure range, and the breather valve has the functions of preventing the storage tank from being damaged due to overpressure or vacuum and reducing the evaporation loss of the stored liquid. When the pressure in the tank reaches the rated positive exhalation pressure, the pressure valve flap is opened, and the steam in the tank is discharged; when the vacuum degree in the tank reaches the rated suction negative pressure, the vacuum valve clack is opened, and air enters. In order to prevent the damage of the atmospheric pressure to the storage tank equipment caused by excessive vacuum, a breather valve with an inspiration function is required to be arranged.
In order to protect equipment such as storage tanks, breathing valves with proper breathing capacity are required to be installed on different storage tanks, and in order to judge whether the design of the breathing valves is reasonable, the inspiratory capacity index of the breathing valves is examined, namely the inspiratory capacity of the breathing valves in a certain time is examined to prevent the negative pressure of a container from being overlarge, so that in order to confirm the inspiratory capacity of the breathing valves and judge whether the inspiratory capacity meets the requirement, the breathing valves are required to be subjected to flow test. The traditional measurement mode is that a flowmeter is arranged between a breather valve and test equipment, the breather valve is placed in a negative pressure environment for flow measurement, the opening pressure of the breather valve in a negative pressure state is smaller and ranges from-0.25 KPa to-0.4 KPa, namely, when the pressure between a container and the atmosphere reaches from-0.25 KPa to-0.4 KPa, the breather valve is opened, and the flow measurement of the breather valve has the following difficulties: 1. the negative pressure environment is difficult to realize; 2. the pressure upstream and downstream of the breather valve is difficult to keep relatively stable for a period of time under the condition of small opening pressure, so that the reading of the flowmeter is inaccurate, and the repeatability is poor.
Disclosure of Invention
The invention aims to solve the technical problems that when the flow of a breather valve is tested, the negative pressure state is unstable, the test result is inaccurate, the repeatability is poor, and the invention provides a breather valve flow testing device and a testing method thereof aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a breather valve flow testing device comprises a closed cavity body, wherein the cavity body is divided into an upper cavity and a lower cavity by a partition plate, a first mounting hole for mounting a tested breather valve is formed in the partition plate, and the cavity body is used for carrying out air inlet and air exhaust on the cavity body through a ventilation system so as to complete testing;
the ventilation system comprises a first air inlet system communicated with the upper cavity and a first exhaust system communicated with the lower cavity, and the first air inlet system and the first exhaust system are synchronously ventilated in the test process.
Preferably, the first air intake system comprises a first air intake device for taking air into the upper chamber, and a first air intake valve arranged between the first air intake device and the upper chamber, and the first air intake device, the first air intake valve and the upper chamber are communicated through a first air intake pipeline;
the first exhaust system comprises a first exhaust device for exhausting air from the lower cavity and a first exhaust valve arranged between the first exhaust device and the lower cavity, and the first exhaust device, the first exhaust valve and the lower cavity are communicated through a first exhaust pipeline;
the first intake valve and the first exhaust valve are opened synchronously in the test process.
Preferably, a throttle valve for adjusting the diameter of the gas flow passage is further provided between the first intake valve and the upper chamber.
Preferably, the measured breather valve comprises a first pipe seat and a first valve body, the first pipe seat is connected to the first mounting hole in a tight fit manner and is communicated with the upper cavity and the lower cavity; the first valve body is arranged at one end of the first pipe seat, which is positioned on the upper cavity, and a flow meter is also arranged in the first pipe seat;
and a fluid director for converting turbulent airflow into laminar airflow is also arranged in the first pipe seat, and the fluid director is arranged between the first valve body and the flowmeter.
Preferably, the flow testing device of the breathing valve further comprises at least one control breathing valve for adjusting the pressure difference between the upper chamber and the lower chamber, at least one second mounting hole for mounting the control breathing valve is arranged around the first mounting hole on the partition plate, and the opening pressure of the control breathing valve is greater than the opening pressure of the tested breathing valve;
the control breather valve comprises a second pipe seat and a second valve body, wherein the second pipe seat is installed in the second installation hole and communicated with the upper cavity and the lower cavity, the second valve body is arranged at one end of the upper cavity, and the diameter of the second pipe seat is smaller than that of the first pipe seat.
Preferably, the ventilation system further comprises a second air intake system in communication with the upper chamber for intake of air into the upper chamber and a third air intake system in communication with the lower chamber for intake of air into the lower chamber;
the second air inlet system comprises a second air inlet device for introducing air into the upper cavity, and the second air inlet device is communicated with the upper cavity through a second air inlet pipeline; a second air inlet valve for controlling the on-off of the second air inlet pipeline is further arranged between the second air inlet device and the upper cavity;
the third air inlet system comprises a third air inlet pipeline communicated with the lower cavity, and a third air inlet valve for controlling the on-off of the third air inlet pipeline is further arranged on the third air inlet pipeline;
and a differential pressure gauge for displaying the pressure difference between the upper cavity and the lower cavity is also arranged between the upper cavity and the lower cavity.
Preferably, the ventilation system further comprises a first protection system for protecting the upper chamber from overpressure, the first protection system comprises a first protection pipeline communicating the upper chamber with the outside, and a first safety valve is arranged on the first protection pipeline;
the ventilation system further comprises a second protection system for performing overpressure protection on the lower cavity, the second protection system comprises a second protection pipeline communicated with the lower cavity and the outside, and a second safety valve is arranged on the second protection pipeline.
The invention also provides a method for testing the flow of the breather valve, which adopts the breather valve flow testing device and is characterized by comprising the following steps:
s1, mounting the tested breather valve on the first mounting hole;
s2, after the respiratory valve flow testing device is closed, the air pressure in the upper cavity and the lower cavity is increased to the specified working air pressure;
and S3, starting the first air inlet system and the first exhaust system, wherein the first air inlet system and the first exhaust system are ventilated synchronously, and the air inlet pressure of the first air inlet system is greater than the exhaust pressure of the first exhaust system.
S4, judging whether the pressure difference between the upper cavity and the lower cavity exceeds the opening pressure of the tested breather valve, if so, executing a step S5; if not, go to step S3;
s5, judging whether the pressures of the upper cavity and the lower cavity are stable, if so, executing a step S6; if not, go to step S3;
and S6, after the flow test of the tested breather valve is completed within the set time, discharging the pressure of the upper cavity and the pressure of the lower cavity to normal pressure, taking out the tested breather valve, and finishing the test.
Preferably, step S1 further includes selecting and installing an appropriate control breather valve according to the opening pressure of the measured breather valve;
and adjusting the opening degree of the throttle valve according to the nominal diameter of the measured breather valve, so that the effective flow passage diameter of the throttle valve is consistent with the flow passage diameter of the measured breather valve.
Preferably, step S2 further includes increasing the pressure in the upper chamber and the lower chamber through the second air intake system and the third air intake system until a prescribed working pressure.
The implementation of the invention has the following beneficial effects: the upper cavity and the lower cavity of the testing equipment are filled with positive pressures with different pressures, and the testing environment of negative pressure is simulated through the pressure difference of the upper cavity and the lower cavity, so that the negative pressure environment is relatively stable, the control of the pressure is easier to realize, the pressure stability in the testing process is kept, the reading of the flowmeter is accurate, and the testing repeatability is good.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of an embodiment of a breath valve flow testing device of the present invention;
FIG. 2 is a flow chart of the steps of the method for testing the flow of the breather valve of the present invention;
FIG. 3 is a flow chart illustrating the steps of one embodiment of the method for testing the flow of a breather valve of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in figure 1, the invention discloses a respiratory valve flow testing device which is used for simulating the installation environment of a respiratory valve to test the flow passing through within a certain time. The testing device respectively fills positive pressures with different pressures in an upper cavity 11 and a lower cavity 12 in a closed cavity 1 to enable the upper cavity and the lower cavity to generate a certain pressure difference, and the pressure of the upper cavity 11 is higher than that of the lower cavity 12, so that the upper cavity 11 simulates an atmospheric pressure environment, and the lower cavity 12 simulates a container environment for installing a tested breather valve 3. The negative pressure environment of the container is simulated by the pressure difference between the upper chamber 11 and the lower chamber 12, so that the flow of the tested breather valve 3 in the working state is measured.
As shown in FIG. 1, the breath valve flow testing device of the present invention includes a sealed cavity 1, and the cavity 1 is preferably made of metal. The cavity 1 is divided into an upper cavity 11 and a lower cavity 12 which are relatively independent and sealed by a partition plate 2, and the partition plate 2 is provided with a first mounting hole 21 for mounting the tested breather valve 3. In some embodiments, an inspection door is further provided on the upper chamber 11, so that an inspector can conveniently enter the testing device to install the tested breather valve 3 and perform necessary inspection work. In some embodiments, the inspection door may be a bolted connection; in other embodiments, the inspection door may be a quick-opening door connection. The testing device respectively performs air inlet and air exhaust actions on the upper cavity 11 and the lower cavity 12 through the ventilation system 4 to complete the test.
The venting system 4 includes a first air intake system 41 in communication with the upper chamber 11 and a first exhaust system 42 in communication with the lower chamber 12 for respectively intake of air to the upper chamber 11 and exhaust of air from the lower chamber 12 during testing. The first air intake system 41 includes a first air intake device 411 for supplying air to the upper chamber 11, and the first air intake device 411 is communicated with the upper chamber 11 through a first air intake pipe 413. In some embodiments, the first intake system 41 further includes a first intake valve 412 disposed on the first intake conduit 413 between the first intake device 411 and the upper chamber 11, and the first intake valve 412 is used for controlling the opening and closing of the first intake conduit 413. The first intake valve 412 may be a regulating valve or a shut-off valve, and in some embodiments is preferably a regulating valve. In some embodiments, the first air inlet 411 further comprises a throttle valve 414 disposed on the first air inlet pipe 413 between the first air inlet valve 412 and the upper chamber 11, wherein the throttle valve 414 is used to adjust the flow path diameter of the gas entering the upper chamber 11, so that the flow path diameter of the gas flowing into the upper chamber 11 is substantially the same as the maximum flow path diameter of the measured breather valve 3, so as to ensure that the pressure in the upper chamber 11 is always kept relatively stable; when the pressure of the upper chamber 11 suddenly decreases during the test, the pressure of the upper chamber 11 can be increased by increasing the opening diameter of the throttle valve 414 to increase the amount of air taken into the upper chamber 11.
The ventilation system 4 further comprises a second air intake system 43 in communication with the upper chamber 11 and a third air intake system 44 in communication with the lower chamber 12 for pre-filling the upper chamber 11 and the lower chamber 12, respectively, with air before the start of the experiment, so that the air pressure in the chamber 1 reaches the prescribed working air pressure. The second air intake system 43 includes a second air intake 431 that feeds air into the upper chamber 11. in some embodiments, the second air intake 431 is in communication with the upper chamber 11 via a second air intake conduit 432. In some embodiments, a second air inlet valve 433 for controlling the opening and closing of the second air inlet pipeline 432 is further disposed between the second air inlet device 431 and the upper chamber 11. The second air intake valve 433 may be a regulating valve or a stop valve, and is preferably a regulating valve in some embodiments. The second air intake system 43 may intake air to the upper chamber 11 by opening the second air intake 431 in some embodiments, and may always remain open by opening the second air intake 431 and intake air to the upper chamber 11 by opening the second air intake valve 433 in other embodiments. The third air intake system 44 includes a third air intake line 441 in communication with the lower chamber 12, and in some embodiments, the third air intake line 441 is in communication with a third air intake device, i.e., air is taken into the lower chamber 12 by the third air intake device; in other embodiments, third gas inlet line 441 communicates between upper chamber 11 and lower chamber 12, i.e., by diverting gas in upper chamber 11 to lower chamber 12 to increase the pressure of gas in lower chamber 12. In some embodiments, a third air intake valve 442 for controlling the opening and closing of the third air intake line 441 is further disposed on the third air intake line 441, wherein the third air intake valve 442 may be a regulating valve or a stop valve, and in some embodiments, is preferably a regulating valve.
In some embodiments, the ventilation system 4 further comprises a first protection system 45 for overpressure protection of the upper chamber 11 and a second protection system 46 for overpressure protection of the lower chamber 12, wherein in some embodiments, the first protection system 45 comprises a first protection pipeline 451 for communicating the upper chamber 11 with the outside, a first safety valve 452 is disposed on the first protection pipeline 451, when the pressure in the upper chamber 11 exceeds a preset value, the first safety valve 452 is opened, and the gas medium is exhausted from the upper chamber 11 through the first protection pipeline 451, i.e., the pressure in the upper chamber 11 is reduced; the second protection system 46 includes a second protection pipeline 461 communicating the lower chamber 12 with the outside, a second safety valve 462 is disposed on the second protection pipeline 461, when the pressure in the lower chamber 12 exceeds a preset value, the second safety valve 462 is opened, and the gas medium is discharged out of the lower chamber 12 through the second protection pipeline 461. On the premise that the pressure regulation in the testing device is failed, in order to avoid accidents caused by excessive overpressure in the upper chamber 11 and the lower chamber 12, when the overpressure in the upper chamber 11 or the lower chamber 12 reaches a certain limit, the first safety valve 452 or the second safety valve 462 is respectively opened, and the pressure is respectively released outwards through the first protection pipeline 451 or the second protection pipeline 461, so as to ensure the testing safety.
The tested breather valve 3 comprises a first pipe seat 31 and a first valve body 32, wherein the first pipe seat 31 is tightly matched with the first mounting hole 21 and is communicated with the upper cavity 11 and the lower cavity 12; the first valve body 32 is provided at one end of the first socket 31 located in the upper chamber 11. In some embodiments, a flow meter 5 is also disposed within the first stem 31 for measuring the flow of gas through the first stem 31 per unit time, and in some embodiments, the flow meter 5 is a subsonic inferential flow meter, such as an orifice plate, a flow nozzle, and a venturi flow meter. To ensure that the flow meter 5 reads accurately, the gas flow in the first stem 31 needs to be stabilized, and in some embodiments, the height of the first stem 31 is preferably equal to or greater than 14 times the diameter of the first stem 31, and in some embodiments, the height of the first stem 31 is preferably 14 times the diameter of the first stem 31 due to the requirement of the flow meter 5 for stable gas flow. In order to match the measurement characteristics of the flow meter 5, in some embodiments, a flow guide 6 for converting turbulent airflow into laminar airflow is further disposed in the first pipe seat 31, and the flow guide 6 is disposed between the first valve body 32 and the flow meter 5.
The respiratory valve flow testing device further comprises at least one control respiratory valve 7 used for adjusting the pressure difference between the upper cavity 11 and the lower cavity 12, at least one second mounting hole 22 for mounting the control respiratory valve 7 is formed in the periphery of the first mounting hole 21 in the partition plate 2, and the control respiratory valve 7 is connected with the second mounting hole 22 in a tight fit mode. The opening pressure of the control breather valve 7 is larger than the opening pressure of the tested breather valve 3, when the pressure difference between the upper cavity 11 and the lower cavity 12 exceeds a preset safety value, the control breather valve 7 is opened, gas flows from the upper cavity 11 to the lower cavity 12, and the pressure of the lower cavity 12 is increased so as to keep in a specified pressure difference range.
The control breather valve 7 comprises a second pipe seat 71 and a second valve body 72, the second pipe seat 71 is installed in the second installation hole 22 and communicated with the upper cavity 11 and the lower cavity 12, the second valve body 72 is arranged at one end, located at the upper cavity 11, of the second pipe seat 71, and the diameter of the second pipe seat 71 is smaller than that of the first pipe seat 31. In some embodiments, the diameter of the second tube holder 71 is preferably 1/4 times the diameter of the first tube holder 31, ensuring that the flow of gas in the upper and lower chambers 11, 12 does not fluctuate significantly when the control breather valve 7 is opened. In some embodiments, the number of the control breather valves 7 is 2 or more than 2, and preferably, the opening pressures of the control breather valves 7 are different and are all larger than the opening pressure of the tested breather valve 3. When the regulating action of the first air inlet valve 412, the first exhaust valve 422 and the throttle valve 414 fails, and the pressure difference between the upper chamber 11 and the lower chamber 12 exceeds the specified range, the testing device will open the control breather valve 7 with the minimum opening pressure first, increase the exhaust volume of the upper chamber 11, reduce the pressure difference between the upper chamber 11 and the lower chamber 12, if the pressure difference continues to increase, when the opening pressure of the control breather valve 7 with the next opening pressure is reached, the control breather valve 7 will be opened, so that the control breather valve 7 is opened according to the opening pressure in sequence, and when the pressure difference gradually decreases, the control breather valve 7 will be closed in sequence until the pressure difference between the upper chamber 11 and the lower chamber 12 returns to the specified range, and the control breather valve 7 is completely closed.
In some embodiments, the respiratory valve flow testing apparatus further comprises a differential pressure gauge 8 that measures the pressure difference between the upper chamber 11 and the lower chamber 12, for accurately monitoring the real-time pressure difference between the upper chamber 11 and the lower chamber 12.
The invention also provides a respiratory valve flow testing method, which is used for testing the inhalation flow of the respiratory valves with different diameters by using the respiratory valve flow testing device. In order to ensure the accurate reading of the flow meter 5, it is required to keep the pressure in the apparatus stable during the test, that is, the intake air flow of the first intake system 41, the exhaust air flow of the first exhaust system 42 and the air flow flowing through the tested breather valve 3 are substantially consistent, according to the displacement theory calculation formula:
in the formula:
Wtgtheoretical displacement, in units: kg/h;
pd — actual discharge pressure (absolute), in units of: MPa;
a-flow passage area, unit is: mm is2；
C is adiabatic exponential function, and C is 2.7;
m-molecular weight of the gas, in units of: kg/kmol, taking 28.96;
z-compression system, Z is 1;
t-actual discharge temperature in units of: k, taking the mixture at normal temperature;
therefore, in order to ensure that the air inlet flow and the exhaust flow are consistent, the actual discharge pressure is ensured to be the same under the condition that the pipe diameters are the same.
Since the exhaust environment of the first exhaust system 42 is atmospheric pressure, the exhaust pressure of the first exhaust system 42 is the same as the working pressure of the measured breather valve 3, and when the intake pressure of the first intake system 41 is 2 times of the working pressure of the measured breather valve 3, the intake pressure of the first intake system 41 is equal to the exhaust pressure of the first exhaust system 42, so that the intake and exhaust flow rates can be kept in a certain balance.
The invention provides a method for testing the flow of a breather valve, which adopts the breather valve flow testing device and comprises the following steps:
s1, when the worker confirms that the device has no pressure, the worker can enter the device upper cavity 11 through the check door, the tested breather valve 3 is installed in the first installation hole 21, a plurality of proper control breather valves 7 are installed according to the opening pressure of the tested breather valve 3, the opening pressure of the control breather valves 7 is guaranteed to be larger than that of the tested breather valve 3, the proper opening degree of the throttle valve 414 is selected according to the diameter of the first pipe seat 31 of the tested breather valve 3, the actual flow passage area of the inlet air is guaranteed to be basically consistent with that of the first pipe seat 31, and the pressure adjustment is guaranteed to be basically stable.
And S2, after the installation is finished, the upper cavity 11 is taken out and the inspection door is closed so as to keep the airtight state of the cavity 1. And opening a second air inlet system 43 and a third air inlet system 44, respectively, feeding air into the upper chamber 11 and the lower chamber 12, and slowly increasing the working pressure of the test equipment until the working pressure is regulated.
S3, after the working pressure is reached, the second and third air intake systems 43 and 44 are closed, the first and second air intake systems 41 and 42 are opened, and the lower chamber 12 is exhausted while the air is being taken into the upper chamber 11. in some embodiments, to keep the flow rates of the first and second air intake systems 41 and 42 substantially balanced, the air intake pressure in the upper chamber 11 is preferably twice the opening pressure of the measured breathing valve 3.
S4, after the first air intake system 41 and the first exhaust system 42 operate for a period of time, the pressure of the upper chamber 11 rises, the pressure of the lower chamber 12 falls, and it is determined whether the pressure difference between the upper chamber 11 and the lower chamber 12 exceeds the opening pressure of the measured breather valve 3, if yes, step S5 is executed; if not, go to step S3;
s5, when the opening pressure of the upper and lower cavity pressure difference measured breather valve 3, the measured breather valve 3 is opened, the airflow flows from the upper cavity 11 to the lower cavity 12, the airflow forms stable airflow through the fluid director 6 and passes through the flowmeter 5, at this time, the differential pressure gauge 8 is observed to judge whether the pressures of the upper cavity 11 and the lower cavity 12 are stable, if yes, the step S6 is executed; if not, go to step S3;
and S6, measuring the flow of the tested breather valve 3 by observing the flow meter 5 within a specified time, discharging the pressure of the upper cavity 11 and the lower cavity 12 to normal pressure, opening the check door, taking out the tested breather valve 3, and finishing the test.
In some embodiments, when the pressure difference between the upper chamber and the lower chamber is higher than the predetermined pressure difference due to uncertain factors such as operation reasons during the test, the control breather valve 7 is opened to increase the exhaust amount of the upper chamber 11, so that the pressure difference between the upper chamber and the lower chamber is reduced, and the control breather valve 7 is automatically closed after the pressure difference between the upper chamber and the lower chamber is restored to a normal value. In some embodiments, due to uncertain factors such as operation reasons, the pressure difference between the upper chamber 11 and the lower chamber is reduced due to the pressure reduction of the upper chamber 11, when the pressure difference between the upper chamber and the lower chamber is smaller than the opening pressure of the measured breather valve 3, the measured breather valve 3 will be closed, the flow meter 5 will not be able to read the flow reading, and at this time, the pressure increase in the upper chamber 11 can be realized by increasing the opening degree of the throttle valve 414, so as to maintain the normal pressure difference between the upper chamber and the lower chamber.
Specifically, in step S1, if the opening pressure of the measured breathing valve 3 is-0.40 KPa, that is, if the pressure difference between the lower chamber 12 and the upper chamber 11 is-0.4 KPa, the measured breathing valve 3 is opened, and gas flows from the upper chamber 11 to the lower chamber 12, the first control breathing valve and the second control breathing valve with opening pressures of-0.5 KPa and-0.6 KPa are installed; and (3) if the nominal diameter of the tested breather valve 3 is DN100, adjusting the opening of the throttle valve 414 with the nominal diameter D200 to 80%, and properly adjusting in the test process to ensure that the actual flow passage area of the inlet air is basically consistent with the nominal diameter of the tested breather valve 3 and the pressure adjustment is basically stable.
In step S2, the second air intake system 43 and the third air intake system 44 are opened, and the air pressure in the upper chamber 11 and the lower chamber 12 is slowly increased to 1.0 MPa.
The intake pressure of the first intake system 41 in step S3 is 2.0MPa to ensure that the flow rate of intake air in the first intake pipe 413 is substantially balanced with the flow rate of exhaust gas in the first exhaust pipe 423. When the pressure difference between the upper chamber 11 and the lower chamber 12 reaches 0.4KPa, the measured breather valve 3 is opened, the gas flows from the upper chamber 11 to the lower chamber 12, the pressure of the upper chamber 11 is 1.0002MPa, the pressure of the lower chamber 12 is 0.9998MPa, the pressure flowing through the first gas inlet pipe 413 is equal to the pressure flowing through the first gas outlet pipe 423, and both the pressures are 0.9998MPa, namely, the pressures in the upper chamber 11 and the lower chamber 12 are always kept stable
In the test process, if the air inflow in the first air inlet pipeline 413 is larger than the air displacement in the first exhaust pipeline 423 due to uncertain factors such as operation reasons and the like, the pressure difference between the upper cavity 11 and the lower cavity 12 exceeds the adjusting range of the tested breather valve 3, so that the pressure of the upper cavity 11 is continuously increased, when the pressure difference between the upper cavity 11 and the lower cavity 12 reaches 0.5KPa, the first control breather valve is opened, the air displacement of the upper cavity 11 flowing to the lower cavity 12 is increased, and the pressure difference of the upper cavity and the lower cavity is reduced; if the pressure difference between the upper and lower chambers continuously increases and reaches 0.6KPa, the second control breather valve is opened, and the measured breather valve 3, the first control breather valve, and the second control breather valve simultaneously guide the gas in the upper chamber 11 to the lower chamber 12, so as to reduce the pressure difference between the upper and lower chambers.
During the test, if the pressure in the upper chamber 11 is reduced due to uncertain factors such as operation reasons, the pressure difference between the upper chamber 11 and the lower chamber 12 becomes small, and the tested breather valve 3 is closed when the pressure is lower than 0.4KPa, the opening degree of the throttle valve 414 can be opened to increase the pressure in the upper chamber 11, so as to maintain the normal pressure difference.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The device for testing the flow of the breather valve is characterized by comprising a closed cavity (1), wherein the cavity (1) is divided into an upper cavity (11) and a lower cavity (12) by a partition plate (2), a first mounting hole (21) for mounting the breather valve (3) to be tested is formed in the partition plate (2), and the cavity (1) is subjected to air inlet and air exhaust through a ventilation system (4) so as to complete testing;
the ventilation system (4) comprises a first air inlet system (41) communicated with the upper cavity (11) and a first exhaust system (42) communicated with the lower cavity (12), and the first air inlet system (41) and the first exhaust system (42) are synchronously ventilated in the test process.
2. The respiratory valve flow test apparatus according to claim 1, wherein the first air intake system (41) comprises a first air intake device (411) for supplying air to the upper chamber (11), and a first air intake valve (412) disposed between the first air intake device (411) and the upper chamber (11), wherein the first air intake device (411), the first air intake valve (412) and the upper chamber (11) are communicated through a first air intake pipeline (413);
the first exhaust system (42) comprises a first exhaust device (421) for exhausting air from the lower cavity (12) and a first exhaust valve (422) arranged between the first exhaust device (421) and the lower cavity (12), and the first exhaust device (421), the first exhaust valve (422) and the lower cavity (12) are communicated through a first exhaust pipeline (423);
the first intake valve (412) and the first exhaust valve (422) are opened simultaneously during the test.
3. The respiratory valve flow test apparatus according to claim 2, wherein a throttle valve (414) for adjusting a diameter of a gas flow path is further provided between the first intake valve (412) and the upper chamber (11).
4. The breather valve flow test device of claim 1, wherein the tested breather valve (3) comprises a first pipe seat (31) and a first valve body (32), the first pipe seat (31) is connected to the first mounting hole (21) in a tight fit manner and is communicated with the upper cavity (11) and the lower cavity (12); the first valve body (32) is arranged at one end, located on the upper cavity (11), of the first pipe seat (31), and a flowmeter (5) is further arranged in the first pipe seat (31);
a fluid director (6) for converting turbulent airflow into laminar airflow is further arranged in the first pipe seat (31), and the fluid director (6) is arranged between the first valve body (32) and the flowmeter (5).
5. The respiratory valve flow test device according to claim 4, further comprising at least one control respiratory valve (7) for adjusting the pressure difference between the upper chamber (11) and the lower chamber (12), wherein at least one second mounting hole (22) for mounting the control respiratory valve (7) is arranged around the first mounting hole (21) on the partition plate (2), and the opening pressure of the control respiratory valve (7) is greater than the opening pressure of the tested respiratory valve (3);
control breather valve (7) include second tube socket (71) and second valve body (72), second tube socket (71) install extremely in second mounting hole (22), the UNICOM go up chamber (11) and lower chamber (12), second valve body (72) are located second tube socket (71) are located the one end of epicoele (11), second tube socket (71) diameter is less than first tube socket (31) diameter.
6. The respiratory valve flow test device according to claim 1, wherein the ventilation system (4) further comprises a second air intake system (43) communicating with the upper chamber (11) for feeding air into the upper chamber (11) and a third air intake system (44) communicating with the lower chamber (12) for feeding air into the lower chamber (12);
the second air intake system (43) comprises a second air intake device (431) for supplying air to the upper chamber (11), and the second air intake device (431) is communicated with the upper chamber (11) through a second air intake pipeline (432); a second air inlet valve (433) for controlling the on-off of the second air inlet pipeline (432) is further arranged between the second air inlet device (431) and the upper cavity (11);
the third air inlet system (44) comprises a third air inlet pipeline (441) communicated with the lower cavity (12), and a third air inlet valve (442) for controlling the third air inlet pipeline (441) to be switched on and off is further arranged on the third air inlet pipeline (441);
and a differential pressure gauge (8) for displaying the pressure difference between the upper cavity (11) and the lower cavity (12) is also arranged between the upper cavity (11) and the lower cavity (12).
7. The respiratory valve flow test device according to claim 1, wherein the ventilation system (4) further comprises a first protection system (45) for overpressure protection of the upper chamber (11), the first protection system (45) comprises a first protection pipeline (451) communicating the upper chamber (11) with the outside, and a first safety valve (452) is arranged on the first protection pipeline (451);
the ventilation system (4) further comprises a second protection system (46) for performing overpressure protection on the lower cavity (12), the second protection system (46) comprises a second protection pipeline (461) communicating the lower cavity (12) and the outside, and a second safety valve (462) is arranged on the second protection pipeline (461).
8. A method for measuring the flow of a breather valve by using the breather valve flow measuring device according to any one of claims 1 to 7, comprising the steps of:
s1, mounting the tested breather valve (3) on the first mounting hole (21);
s2, after the breather valve flow testing device is closed, the air pressure in the upper cavity (11) and the lower cavity (12) is increased to a specified working air pressure;
s3, starting the first air intake system (41) and the first exhaust system (42), wherein the first air intake system (41) is ventilated synchronously with the first exhaust system (42), and the air intake pressure of the first air intake system (41) is larger than the exhaust pressure of the first exhaust system (42);
s4, judging whether the pressure difference between the upper cavity (11) and the lower cavity (12) exceeds the opening pressure of the tested breather valve (3), if so, executing a step S5; if not, go to step S3;
s5, judging whether the pressure of the upper cavity (11) and the lower cavity (12) is stable, if so, executing a step S6; if not, go to step S3;
and S6, after the flow test of the tested breather valve (3) is completed within the set time, the pressure of the upper cavity (11) and the lower cavity (12) is discharged to normal pressure, the tested breather valve (3) is taken out, and the test is finished.
9. The method for testing the flow of a breathing valve according to claim 8, wherein step S1 further comprises selecting and installing a suitable control breathing valve (7) according to the opening pressure of the tested breathing valve (3);
and adjusting the opening degree of the throttle valve (413) according to the nominal diameter of the tested breather valve (3) to enable the effective flow passage diameter of the throttle valve (413) to be consistent with the flow passage diameter of the tested breather valve (3).
10. The method for testing the flow of a breathing valve according to claim 8, wherein step S2 further comprises increasing the pressure in the upper chamber (11) and the lower chamber (12) up to a prescribed working pressure by the second air intake system (43) and the third air intake system (44).
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| CN117268742A (en) * | 2023-11-21 | 2023-12-22 | 山东业翔检测有限公司 | On-line detection device and detection method for breather valve |
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| CN111122151B (en) | 2024-04-30 |
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