CN111122151B - Breather valve flow testing device and testing method thereof - Google Patents
Breather valve flow testing device and testing method thereof Download PDFInfo
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- CN111122151B CN111122151B CN202010123163.4A CN202010123163A CN111122151B CN 111122151 B CN111122151 B CN 111122151B CN 202010123163 A CN202010123163 A CN 202010123163A CN 111122151 B CN111122151 B CN 111122151B
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- 230000029058 respiratory gaseous exchange Effects 0.000 description 17
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a breather 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, a first mounting hole for mounting a breather valve to be tested is formed in the partition plate, and the cavity is subjected to air inlet and air exhaust through a ventilation system to complete testing; the ventilation system includes a first air intake system in communication with the upper chamber and a first exhaust system in communication with the lower chamber, the first air intake system and the first exhaust system being synchronously ventilated during testing. The invention also discloses a breather valve flow testing method for the breather valve flow testing device, and the breather valve flow testing device is characterized in that through the first air inlet system and the first air outlet system which are synchronously ventilated, the upper cavity in the testing device is air-inlet and the lower cavity is air-discharged, so that the pressure of the upper cavity is always larger than that of the lower cavity, the pressure of the upper and lower sides of the breather valve working environment is ensured to be relatively stable while the negative pressure is simulated by positive pressure, the occurrence of large fluctuation of air pressure in the testing process is avoided, the reading of the flowmeter 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 petroleum, chemical products and the like, in particular to a breather valve flow testing device 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 in a certain pressure range and can be communicated with the atmosphere when the pressure range is exceeded or undershot, and the breather valve has the function of preventing the storage tank from being damaged due to overpressure or vacuum and reducing evaporation loss of the storage liquid. When the pressure in the tank reaches the rated exhalation positive pressure, the pressure valve clack is opened, and vapor 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 tank equipment caused by the excessive vacuum, a breather valve having an air suction function needs to be installed.
In order to protect equipment such as a storage tank and the like, breathing valves with proper breathing capacity are required to be arranged on different storage tanks, in order to judge whether the design of the breathing valves is reasonable, the breathing capacity indexes of the breathing valves are checked, namely, the breathing capacity of the breathing valves in a certain time is checked, and the negative pressure of a container is prevented from being too large, so that in order to confirm the breathing capacity of the breathing valves, whether the breathing capacity meets the requirement is judged, and the flow test is required to be carried out on the breathing valves. The traditional measuring mode is that a flowmeter is arranged between a breather valve and testing equipment, the breather valve is placed in a negative pressure environment for flow measurement, the opening pressure of the breather valve is smaller in a negative pressure state and is-0.25 KPa to-0.4 KPa, namely when the pressure between a container and the atmospheric pressure reaches-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. with a small opening pressure, the pressure upstream and downstream of the breather valve is difficult to maintain relatively stable for a period of time, resulting in inaccurate meter readings and poor repeatability.
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 breather valve flow testing device and the breather valve flow testing method are provided for overcoming the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
The breather valve flow testing device comprises a closed cavity, wherein the cavity is divided into an upper cavity and a lower cavity by a partition plate, a first mounting hole for mounting a breather valve to be tested is formed in the partition plate, and the cavity is subjected to air inlet and air exhaust through a ventilation system 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 synchronously ventilate in a test process.
Preferably, the first air inlet system comprises a first air inlet device for introducing air into the upper cavity and a first air inlet valve arranged between the first air inlet device and the upper cavity, and the first air inlet device, the first air inlet valve and the upper cavity are communicated through a first air inlet 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 air inlet valve and the first air outlet valve are synchronously opened in the testing process.
Preferably, a throttle valve for adjusting the diameter of the gas flow passage is further arranged between the first air inlet valve and the upper cavity.
Preferably, the tested breather valve comprises a first pipe seat and a first valve body, wherein 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 tube seat, which is positioned in the upper cavity, and a flowmeter is arranged in the first tube seat;
And a flow director which converts turbulent air flow into laminar flow is further arranged in the first tube seat, and the flow director is arranged between the first valve body and the flowmeter.
Preferably, the breather valve flow testing device further comprises at least one control breather valve for adjusting the pressure difference between the upper cavity and the lower cavity, at least one second mounting hole for mounting the control breather valve is arranged around the first mounting hole on the partition board, and the opening pressure of the control breather valve is larger than the opening pressure of the tested breather valve;
The control breather valve comprises a second tube seat and a second valve body, wherein the second tube 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 second tube seat, which is positioned in the upper cavity, and the diameter of the second tube seat is smaller than that of the first tube seat.
Preferably, the ventilation system further comprises a second air intake system in communication with the upper chamber for supplying air to the upper chamber and a third air intake system in communication with the lower chamber for supplying air to the lower chamber;
The second air inlet system comprises a second air inlet device for feeding air to 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 also 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 differential pressure of 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 overpressure protection of the upper cavity, the first protection system comprises a first protection pipeline which is communicated with the upper cavity and 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 is characterized by comprising the following steps of:
s1, mounting the tested breather valve on the first mounting hole;
s2, after the breather valve flow testing device is sealed, the air pressure in the upper cavity and the air pressure in the lower cavity are increased to the specified working air pressure;
S3, starting the first air inlet system and the first exhaust system, wherein the first air inlet system and the first exhaust system are synchronously ventilated, and the air inlet pressure of the first air inlet system is larger 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, and if so, executing the step S5; if not, executing the step S3;
s5, judging whether the pressures of the upper cavity and the lower cavity are stable, and if yes, executing a step S6; if not, executing the step S3;
s6, after the flow test of the tested breather valve is completed within a specified time, the pressures of the upper cavity and the lower cavity are discharged to normal pressure, the tested breather valve is taken out, and the test is finished.
Preferably, step S1 further comprises selecting and installing an appropriate control respiratory valve according to the opening pressure of the respiratory valve to be tested;
And adjusting the opening degree of the throttle valve according to the nominal diameter of the tested breather valve so that the effective flow channel diameter of the throttle valve is consistent with the flow channel diameter of the tested breather valve.
Preferably, step S2 further comprises increasing the pressure in the upper and lower chambers up to a prescribed operating pressure by the second and third air intake systems.
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 pressure with different pressures, and the testing environment of the 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 maintained, the flowmeter reads accurately, 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 diagram of an embodiment of a respiratory valve flow testing device of the present invention;
FIG. 2 is a flow chart of the steps of the method for testing the flow rate of the breather valve of the present invention;
FIG. 3 is a flow chart of test steps of one embodiment of a method for testing respiratory valve flow of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, the invention discloses a breather valve flow testing device, which is used for simulating the installation environment of a breather valve to test the flow passing through the breather valve in a certain time. According to the testing device, positive pressures with different pressures are respectively filled in the upper cavity 11 and the lower cavity 12 in the closed cavity 1, so that a certain pressure difference is generated between the upper cavity and the lower cavity, the pressure of the upper cavity 11 is higher than that of the lower cavity 12, the upper cavity 11 simulates an atmospheric pressure environment, and the lower cavity 12 simulates a container environment for installing the tested breather valve 3. The negative pressure environment of the container is simulated by the pressure difference between the upper cavity 11 and the lower cavity 12, so that the flow of the tested breather valve 3 in the working state is measured.
As shown in fig. 1, the breather valve flow testing device of the present invention includes a closed 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 airtight by a partition plate 2, and a first mounting hole 21 for mounting the tested breather valve 3 is formed in the partition plate 2. In some embodiments, an inspection door is further arranged on the upper cavity 11, so that inspection personnel can conveniently enter the testing equipment to perform the installation and necessary inspection work of the tested breather valve 3. In some embodiments, the inspection door may be bolted; in other embodiments, the inspection door may be a quick-open door connection. The testing device 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 ventilation system 4 comprises a first air intake system 41 in communication with the upper chamber 11 and a first air exhaust system 42 in communication with the lower chamber 12 for respectively intake of air to the upper chamber 11 and exhaust of air to the lower chamber 12 during testing. Wherein, the first air intake system 41 comprises a first air intake device 411 for introducing air into the upper cavity 11, and the first air intake device 411 is communicated with the upper cavity 11 through a first air intake pipeline 413. In some embodiments, the first air intake system 41 further includes a first air intake valve 412 disposed on the first air intake pipe 413, between the first air intake device 411 and the upper chamber 11, and the first air intake valve 412 is used to control the on-off of the first air intake pipe 413. Wherein the first intake valve 412 may be a regulating valve or a shut-off valve, which in some embodiments is preferred. In some embodiments, the first air inlet device 411 further includes a throttle valve 414 disposed on the first air inlet pipe 413 between the first air inlet valve 412 and the upper chamber 11, where the throttle valve 414 is used to adjust the flow path diameter of the air entering the upper chamber 11, so that the flow path diameter of the air flowing into the upper chamber 11 is approximately the same as the maximum flow path diameter of the tested breather valve 3, so as to ensure that the pressure of the upper chamber 11 is always relatively stable; when the pressure of the upper chamber 11 suddenly decreases during the test, the pressure of the upper chamber 11 may be increased by enlarging the opening diameter of the throttle valve 414 to increase the intake air amount of the upper chamber 11.
The first exhaust system 42 includes a first exhaust 421 that draws air from the lower chamber 12 during testing, the first exhaust 421 being in communication with the lower chamber 12 via a first exhaust line 423. In some embodiments, the first exhaust system 42 further includes a first exhaust valve 422 disposed on the first exhaust pipe 423, between the first exhaust device 421 and the lower chamber 12, and the first exhaust valve 422 is used to control the on/off of the first exhaust pipe 423. In some embodiments, the first exhaust valve 422 may be a regulator valve or a shut-off valve, which in some embodiments is preferred. In some embodiments, the first air intake 411 and the first air exhaust 421 are opened synchronously to ensure that the upper chamber 11 and the lower chamber 12 begin air intake and air exhaust synchronously during the experiment; in other embodiments, when the first air intake device 411 and the first air exhaust device 421 cannot be synchronously started, the first air intake valve 412 and the first air exhaust valve 422 are synchronously opened to ensure that the upper chamber 11 and the lower chamber 12 start to intake and exhaust synchronously during the experiment.
The ventilation system 4 further comprises a second air inlet system 43 in communication with the upper chamber 11 and a third air inlet system 44 in communication with the lower chamber 12 for pre-charging the upper chamber 11 and the lower chamber 12, respectively, with air before the start of the experiment, to bring the air pressure in the chamber 1 to a prescribed operating air pressure. The second air intake system 43 includes a second air intake 431 that is in communication with the upper chamber 11 via a second air intake line 432, and in some embodiments, the second air intake 431 is in communication with the upper chamber 11. In some embodiments, a second air inlet valve 433 for controlling the on-off of the second air inlet pipeline 432 is further disposed between the second air inlet device 431 and the upper cavity 11. Wherein the second intake valve 433 may be a regulator valve or a shut-off valve, which in some embodiments is preferred. The second air intake system 43 may in some embodiments provide air to the upper chamber 11 by opening the second air intake device 431, and may in other embodiments be maintained open by the second air intake device 431 and provide air to the upper chamber 11 by opening the second air intake valve 433. The third air intake system 44 includes a third air intake conduit 441 in communication with the lower chamber 12, and in some embodiments, the third air intake conduit 441 communicates with a third air intake device, i.e., intake air to the lower chamber 12 via the third air intake device; in other embodiments, the third gas inlet line 441 communicates the upper chamber 11 with the lower chamber 12, i.e., by directing the gas in the upper chamber 11 to the lower chamber 12 to raise the gas pressure in the lower chamber 12. In some embodiments, a third air inlet valve 442 for controlling the opening and closing of the third air inlet pipe 441 is further disposed on the third air inlet pipe 441, where the third air inlet 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 cavity 11 and a second protection system 46 for overpressure protection of the lower cavity 12, wherein in some embodiments, the first protection system 45 comprises a first protection pipeline 451 for communicating the upper cavity 11 with the outside, a first safety valve 452 is arranged on the first protection pipeline 451, when the pressure in the upper cavity 11 exceeds a preset value, the first safety valve 452 is opened, and the gaseous medium is discharged from the upper cavity 11 through the first protection pipeline 451, namely the pressure in the upper cavity 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 provided 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 from the lower chamber 12 through the second protection pipeline 461. On the premise of failure of air pressure regulation in the testing device, in order to avoid accidents caused by excessive overpressure in the upper cavity 11 and the lower cavity 12, when the overpressure in the upper cavity 11 or the lower cavity 12 reaches a certain limit, the first safety valve 452 or the second safety valve 462 is opened respectively and is decompressed outwards through the first protection pipeline 451 or the second protection pipeline 461 respectively, so as to ensure testing safety.
The tested breather valve 3 comprises a first tube seat 31 and a first valve body 32, the first tube seat 31 is tightly matched with the first mounting hole 21, and the upper cavity 11 and the lower cavity 12 are communicated; the first valve body 32 is disposed at one end of the first tube seat 31 at the upper chamber 11. In some embodiments, a flow meter 5 is also provided within the first tube holder 31 for measuring the flow rate of gas flowing through the first tube holder 31 per unit time, and in some embodiments, the flow meter 5 is a subsonic inferred flow meter such as an orifice plate, flow nozzle, and venturi flow meter. To ensure accurate readings of the flow meter 5, the gas flow within the first tube holder 31 is stable, and in some embodiments, the height of the first tube holder 31 is preferably greater than or equal to 14 times the diameter of the first tube holder 31, and in some embodiments, the height of the first tube holder 31 is preferably 14 times the diameter of the first tube holder 31 due to the requirement of the flow meter 5 for stable gas flow. To match the measurement characteristics of the flow meter 5, in some embodiments, a flow director 6 is further disposed within the first tube holder 31 to convert turbulent airflow into laminar flow, the flow director 6 being disposed between the first valve body 32 and the flow meter 5.
The breather valve flow testing device further comprises at least one control breather valve 7 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 breather valve 7 is arranged around the first mounting hole 21 on the partition board 2, and the control breather valve 7 is in tight fit connection with the second mounting hole 22. The opening pressure of the control breather valve 7 is larger than the opening pressure of the detected 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 be kept within a specified pressure difference range.
The control breather valve 7 includes a second stem 71 and a second valve body 72, the second stem 71 is mounted in the second mounting hole 22 to communicate the upper chamber 11 and the lower chamber 12, the second valve body 72 is provided at one end of the second stem 71 located in the upper chamber 11, and the diameter of the second stem 71 is smaller than that of the first stem 31. In some embodiments, the diameter of the second tube seat 71 is preferably 1/4 of the diameter of the first tube seat 31, so that the air flow in the upper chamber 11 and the lower chamber 12 is not greatly fluctuated when the breather valve 7 is controlled to be opened. In some embodiments, the number of control respiratory valves 7 is 2 or more, preferably the opening pressures of a plurality of control respiratory valves 7 are different and are all larger than the opening pressure of the tested respiratory valve 3. When the regulation of the first intake valve 412, the first exhaust valve 422 and the throttle valve 414 fails, after the pressure difference between the upper chamber 11 and the lower chamber 12 exceeds a predetermined range, the test device will first open the control breathing valve 7 with the smallest opening pressure, increase the exhaust volume of the upper chamber 11, decrease the pressure difference between the upper chamber 11 and the lower chamber 12, if the pressure difference continues to increase at this time, when the opening pressure of the control breathing valve 7 with the second opening pressure is reached, the control breathing valve 7 will be opened, so that the control breathing valve 7 will be sequentially opened according to the opening pressure, and when the pressure difference gradually decreases, the control breathing valve 7 will be sequentially closed until the pressure difference between the upper chamber 11 and the lower chamber 12 returns to the predetermined range, and the control breathing valve 7 is completely closed.
In some embodiments, the respiratory valve flow testing device further includes a differential pressure gauge 8 measuring the pressure differential between the upper chamber 11 and the lower chamber 12 for accurately monitoring the real-time pressure differential between the upper chamber 11 and the lower chamber 12.
The invention also provides a breather valve flow testing method, which is used for testing the suction flow of the breather valves with different diameters. To ensure accurate readings of the flowmeter 5, it is required to keep the pressure in the device stable during the test, that is, the intake air flow rate of the first intake system 41, the exhaust air flow rate of the first exhaust system 42, and the air flow rate flowing through the tested breather valve 3 are substantially consistent, according to the displacement theory calculation formula:
Wherein:
W tg -theoretical displacement in units of: kg/h;
pd-actual discharge pressure (absolute), in units of: MPa;
A-flow passage area, unit is: mm 2;
C, an adiabatic exponential function, wherein C is 2.7;
M-molecular weight of the gas in units of: kg/kmol, 28.96;
z is a compression system, Z is 1;
T-actual discharge temperature in units of: k, taking the room temperature;
it can be known that in order to ensure that the inlet air flow and the outlet air flow are consistent, the actual discharge pressure is only required to be 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 the atmospheric pressure, the exhaust pressure of the first exhaust system 42 is the same as the working pressure of the tested breather valve 3, and when the intake pressure of the first intake system 41 is 2 times the working pressure of the tested 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 at a certain balance.
The invention provides a method for testing flow of a breather valve, which adopts the breather valve flow testing device and comprises the following steps:
s1, under the condition that no pressure exists in equipment, workers can enter the upper cavity 11 of the equipment through the check door, the tested breather valve 3 is installed to the first installation hole 21, a plurality of proper control breather valves 7 are selectively installed according to the opening pressure of the tested breather valve 3, the opening pressure of the control breather valves 7 is ensured to be larger than that of the tested breather valve 3, and 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, so that the actual flow passage area of air inlet is ensured to be basically consistent with the diameter of the first pipe seat 31, and the pressure adjustment is ensured to be basically stable.
S2, after the installation is finished, the upper cavity 11 is withdrawn, and the inspection door is closed, so that the airtight state of the cavity 1 is maintained. The second air intake system 43 and the third air intake system 44 are turned on to intake air to the upper chamber 11 and the lower chamber 12, respectively, and the operating pressure of the test apparatus is slowly raised up to a prescribed operating pressure.
S3, after the working pressure is reached, the second air intake system 43 and the third air intake system 44 are closed, and the first air intake system 41 and the first air exhaust system 42 are opened, and the lower chamber 12 is exhausted outwards while the upper chamber 11 is in air, and in some embodiments, in order to keep the flow rates of the first air intake system 41 and the first air exhaust system 42 substantially balanced, the air intake pressure of the upper chamber 11 is preferably twice the opening pressure of the tested breather valve 3.
S4, after the first air inlet system 41 and the first air outlet system 42 work for a period of time, the pressure of the upper cavity 11 rises, the pressure of the lower cavity 12 falls, whether the pressure difference between the upper cavity 11 and the lower cavity 12 exceeds the opening pressure of the tested breather valve 3 is judged, and if yes, the step S5 is executed; if not, executing the step S3;
S5, when the pressure difference between the upper cavity and the lower cavity is the opening pressure of the tested breather valve 3, the tested breather valve 3 is opened, air flows from the upper cavity 11 to the lower cavity 12, the air flows through the flow guider 6 to form stable air flow, and the air flow passes through the flow meter 5, at the moment, the differential pressure meter 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, executing the step S3;
S6, measuring the flow of the tested breather valve 3 by observing the flowmeter 5 in a set time, discharging the pressure of the upper cavity 11 and the lower cavity 12 to normal pressure, opening the inspection door, taking out the tested breather valve 3, and ending the test.
In some embodiments, when the pressure difference between the upper cavity and the lower cavity is higher than the preset pressure difference due to uncertain factors such as operation reasons during the testing process, the control breather valve 7 will be opened to increase the exhaust amount of the upper cavity 11, so that the pressure difference between the upper cavity and the lower cavity is reduced, and when the pressure difference between the upper cavity and the lower cavity is restored to the normal value, the control breather valve 7 is automatically closed. In some embodiments, due to uncertain factors such as operation reasons, the pressure of the upper cavity 11 is reduced, so that the pressure difference between the upper cavity and the lower cavity is reduced, when the pressure difference between the upper cavity and the lower cavity is smaller than the opening pressure of the tested breather valve 3, the tested breather valve 3 is closed, the flowmeter 5 cannot read the flow reading, and at this time, the opening of the throttle valve 414 can be increased to realize the increase of the pressure in the upper cavity 11, so that the normal pressure difference between the upper cavity and the lower cavity is maintained.
Specifically, in step S1, if the opening pressure of the tested breather valve 3 is-0.40 KPa, that is, when the pressure difference between the lower chamber 12 and the upper chamber 11 is-0.4 KPa, the tested breather valve 3 is opened, and the gas flows from the upper chamber 11 to the lower chamber 12, then the first control breather valve and the second control breather valve with opening pressures of-0.5 KPa and-0.6 KPa are installed; and if the measured nominal diameter of the tested breather valve 3 is DN100, the opening degree of the throttle valve 414 with the nominal diameter D200 is adjusted to 80%, and the throttle valve is properly fine-tuned in the testing process, so that the actual flow passage area of the air inlet is ensured to be basically consistent with the nominal diameter of the tested breather valve 3, and the pressure adjustment is ensured to be 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 1.0MPa.
The intake pressure of the first intake system 41 in step S3 is 2.0MPa to ensure that the intake air flow in the first intake pipe 413 is substantially balanced with the exhaust air flow in the first exhaust pipe 423. When the pressure difference between the upper chamber 11 and the lower chamber 12 reaches 0.4KPa, the tested 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 air pressure flowing through the first air inlet pipeline 413 is equal to the air pressure flowing through the first air outlet pipeline 423 and is 0.9998MPa, namely the pressure in the upper chamber 11 and the pressure in the lower chamber 12 are always kept stable
In the testing process, if the air inflow in the first air inlet pipeline 413 is larger than the air outflow in the first air outlet pipeline 423 due to uncertain factors such as operation reasons, the pressure difference between the upper cavity 11 and the lower cavity 12 exceeds the adjustment 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 outflow of the upper cavity 11 to the lower cavity 12 is increased, and the pressure difference between the upper cavity and the lower cavity is reduced; if the pressure difference between the upper cavity and the lower cavity continuously rises at the moment, and reaches 0.6KPa, the second control breather valve is opened, and the detected breather valve 3, the first control breather valve and the second control breather valve simultaneously drain the gas in the upper cavity 11 to the lower cavity 12 so as to reduce the pressure difference between the upper cavity and the lower cavity.
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 is reduced, and when the pressure is lower than 0.4KPa, the tested breather valve 3 will be closed, and at this time, the opening of the throttle valve 414 can be opened, so that the pressure in the upper chamber 11 is increased to maintain the normal pressure difference.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The breather valve flow testing device is characterized by comprising a closed cavity (1), wherein the cavity (1) is divided into an upper cavity (11) and a lower cavity (12) through a partition board (2), a first mounting hole (21) for mounting a breather valve (3) to be tested is formed in the partition board (2), and the cavity (1) is used for carrying out air inlet and air exhaust on the cavity (1) through an air ventilation system (4) to complete testing;
The ventilation system (4) comprises a first air inlet system (41) communicated with the upper cavity (11) and a first air outlet system (42) communicated with the lower cavity (12), wherein the first air inlet system (41) and the first air outlet system (42) synchronously ventilate during a test;
The first air inlet system (41) comprises a first air inlet device (411) for introducing air into the upper cavity (11), and a first air inlet valve (412) arranged between the first air inlet device (411) and the upper cavity (11), wherein the first air inlet device (411), the first air inlet valve (412) and the upper cavity (11) are communicated through a first air inlet 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);
-said first inlet valve (412) and said first outlet valve (422) are opened synchronously during testing;
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 the upper cavity (11) and the lower cavity (12) are communicated; the first valve body (32) is arranged at one end of the first tube seat (31) positioned in the upper cavity (11), and a flowmeter (5) is further arranged in the first tube seat (31);
And a flow guider (6) for converting turbulent air flow into laminar flow is further arranged in the first tube seat (31), and the flow guider (6) is arranged between the first valve body (32) and the flowmeter (5).
2. The respiratory valve flow testing device according to claim 1, wherein a throttle valve (414) for adjusting the diameter of the gas flow passage is further provided between the first intake valve (412) and the upper chamber (11).
3. The respiratory valve flow testing device according to claim 1, further comprising at least one control respiratory valve (7) for adjusting a 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 provided around the first mounting hole (21) on the partition plate (2), and wherein a opening pressure of the control respiratory valve (7) is larger than a opening pressure of the tested respiratory valve (3);
The control breather valve (7) comprises a second tube seat (71) and a second valve body (72), the second tube 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 of the second tube seat (71) located in the upper cavity (11), and the diameter of the second tube seat (71) is smaller than that of the first tube seat (31).
4. The respiratory valve flow testing device according to claim 1, wherein the ventilation system (4) further comprises a second air intake system (43) in communication with the upper chamber (11) for intake of air to the upper chamber (11) and a third air intake system (44) in communication with the lower chamber (12) for intake of air to the lower chamber (12);
The second air inlet system (43) comprises a second air inlet device (431) for introducing air into the upper cavity (11), and the second air inlet device (431) is communicated with the upper cavity (11) through a second air inlet pipeline (432); a second air inlet valve (433) for controlling the on-off of the second air inlet pipeline (432) is also 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 on-off of the third air inlet pipeline (441) is further arranged on the third air inlet pipeline (441);
and a differential pressure gauge (8) for displaying the differential pressure of the upper cavity (11) and the lower cavity (12) is further arranged between the upper cavity (11) and the lower cavity (12).
5. The respiratory valve flow testing 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) comprising a first protection pipe (451) communicating the upper chamber (11) with the outside, the first protection pipe (451) being provided with a first safety valve (452);
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) communicated with the lower cavity (12) and the outside, and a second safety valve (462) is arranged on the second protection pipeline (461).
6. A method for testing the flow of a breather valve, which adopts the breather valve flow testing device according to any one of claims 1 to 5, and is characterized by comprising the following steps:
s1, mounting the tested breather valve (3) on the first mounting hole (21);
s2, after the breather valve flow testing device is sealed, the air pressure in the upper cavity (11) and the air pressure in the lower cavity (12) are increased to the specified working air pressure;
S3, starting the first air inlet system (41) and the first exhaust system (42), wherein the first air inlet system (41) and the first exhaust system (42) are synchronously ventilated, and the air inlet pressure of the first air inlet 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), and if so, executing the step S5; if not, executing the step S3;
S5, judging whether the pressures of the upper cavity (11) and the lower cavity (12) are stable, and if yes, executing the step S6; if not, executing the step S3;
S6, after the flow test of the tested breather valve (3) is completed within a specified time, discharging the pressure of the upper cavity (11) and the pressure of the lower cavity (12) to normal pressure, taking out the tested breather valve (3), and ending the test.
7. The method according to claim 6, characterized in that step S1 further comprises selecting and installing a suitable control breather valve (7) according to the opening pressure of the tested breather valve (3);
And adjusting the opening degree of the throttle valve (414) according to the nominal diameter of the tested breather valve (3) so that the effective flow channel diameter of the throttle valve (414) is consistent with the flow channel diameter of the tested breather valve (3).
8. The method according to claim 6, characterized in that step S2 further comprises increasing the pressure in the upper chamber (11) and the lower chamber (12) up to a prescribed operating pressure by means of the second air intake system (43) and the third air intake system (44).
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| CN106224631A (en) * | 2016-07-19 | 2016-12-14 | 中国人民解放军总后勤部油料研究所 | A kind of breather valve on-line measuring device and method |
| CN110207976A (en) * | 2019-07-10 | 2019-09-06 | 浙江省泵阀产品质量检验中心（永嘉县质量技术监督检测研究院） | A kind of automobile-used breather valve intelligent type comprehensive test device of oil tank |
| RU2699934C1 (en) * | 2018-12-27 | 2019-09-11 | Публичное акционерное общество "Транснефть" (ПАО "Транснефть") | Test bench for testing respiratory and safety valves of tanks with oil and oil products |
| CN110657982A (en) * | 2019-11-12 | 2020-01-07 | 上海鑫锐达智能科技股份有限公司 | Breather valve capability test system |
| CN211347370U (en) * | 2020-02-27 | 2020-08-25 | 深圳市特种设备安全检验研究院 | Breather valve flow testing arrangement |
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2020
- 2020-02-27 CN CN202010123163.4A patent/CN111122151B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224631A (en) * | 2016-07-19 | 2016-12-14 | 中国人民解放军总后勤部油料研究所 | A kind of breather valve on-line measuring device and method |
| RU2699934C1 (en) * | 2018-12-27 | 2019-09-11 | Публичное акционерное общество "Транснефть" (ПАО "Транснефть") | Test bench for testing respiratory and safety valves of tanks with oil and oil products |
| CN110207976A (en) * | 2019-07-10 | 2019-09-06 | 浙江省泵阀产品质量检验中心（永嘉县质量技术监督检测研究院） | A kind of automobile-used breather valve intelligent type comprehensive test device of oil tank |
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| CN211347370U (en) * | 2020-02-27 | 2020-08-25 | 深圳市特种设备安全检验研究院 | Breather valve flow testing arrangement |
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