CN207007487U - Detect the detector for safety valve of the Opening pressure of safety valve - Google Patents
Detect the detector for safety valve of the Opening pressure of safety valve Download PDFInfo
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- CN207007487U CN207007487U CN201720815672.7U CN201720815672U CN207007487U CN 207007487 U CN207007487 U CN 207007487U CN 201720815672 U CN201720815672 U CN 201720815672U CN 207007487 U CN207007487 U CN 207007487U
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Abstract
The utility model provides a kind of detector for safety valve for the Opening pressure for detecting safety valve, including source of the gas (10), the fixed volume cavity volume (30) with fixed volume being connected with tested safety valve, flow controller (20), pressure sensor (40) and controller (50), the device makes flow controller (20) to provide flow to fixed volume cavity volume (30) supply gas, and the flow and pressure detection data of the gas that is controlled according to flow controller (20) determine the Opening pressure of safety valve, the Opening pressure of safety valve can accurately be detected.
Description
Technical field
The utility model belongs to pressure sensing arts, and in particular to a kind of safety valve inspection of Opening pressure for detecting safety valve
Survey device.
Background technology
Safety valve is a kind of safeguard protection valve, the pressure for making it internal for protection equipment be maintained at safe range it
It is interior.Safety valve internal cavity is connected via pressure tappings with protected device interior.Safety valve internal cavity by one by
Control valve is connected with the pressure relief opening of safety valve, and pressure relief opening is connected with the outside of the safety valve with constant pressure.
The input pressure of safety valve is the pressure of medium at pressure tappings.When input pressure is less than Opening pressure, Controlled valve
Door is closed, and safety valve internal cavity does not connect with outside.It is controlled as input pressure rise is when Opening pressure
Valve automatically turns on, safety valve internal cavity is connected with outside via pressure relief opening, by outwards discharge/absorbing medium prevents
The pressure of device interior is above/below specified value.The open/close states of controlled valve are also referred to as the open/close states of safety valve.
In order to check that can safety valve accurately work, it is necessary to multiple parameters to safety valve within setting pressure tolerances
Detected.One of which is Opening pressure, refers to input pressure when safety valve starts to open.
The detection of traditional opening pressure of safety valve uses artificial method.Specifically, when detecting operation, it is necessary to grasp
Make personnel one side regulation safety valve input pressure, while observation judges whether safety valve is opened, when finding that safety valve is opened, stand
I.e. the reading of recording manometer is as Opening pressure.It is a difficult point to judge safety valve start-up time, and usually ear listens safety valve
Exhaust sound, also have by way of counting bubble under water.These method operation difficulties are big and complicated, and need from reading
Reading on continually changing pressure gauge, accuracy of detection be not high.
Utility model content
The utility model is completed to solve the above problems, its object is to, there is provided a kind of easy to operate and inspection
Survey the high detector for safety valve of precision.
The detector for safety valve of one embodiment of the present utility model, it detects the Opening pressure of safety valve, and it includes：
The gas supply source of gas is provided；The fixed volume cavity volume with fixed volume being connected with tested safety valve；Flow control is single
Member, it is arranged between above-mentioned gas supply source and above-mentioned fixed volume cavity volume, and control in real time supplies from above-mentioned gas supply source
To the flow of the gas of above-mentioned fixed volume cavity volume；Pressure sensor, it detects the pressure in above-mentioned fixed volume cavity volume in real time,
And output pressure detection data；And controller, its above-mentioned flow controlling unit is controlled make above-mentioned flow controlling unit with
Defined flow is to above-mentioned fixed volume cavity volume supply gas, and the flow of the gas controlled according to above-mentioned flow controlling unit
The Opening pressure of above-mentioned safety valve is determined with above-mentioned pressure detection data.
Wherein, above-mentioned fixed volume cavity volume is the chamber with fixed volume, and it both can be a chamber being separately provided
It room, can also be made up of the pipeline of connection traffic control unit and tested safety valve, the tested safety being not switched on can also be included
The inner space of valve." there is fixed volume " mentioned here, refer to the appearance in the detection process middle chamber to being tested safety valve
Product keeps constant.In addition, the volume of fixed volume cavity volume can be according to the gas pressure of gas supply source, the flow of supply gas
Etc. suitably setting.
In above-mentioned detector for safety valve, preferably from above-mentioned flow controlling unit with constant flow rate to above-mentioned fixed volume
Cavity volume supply gas, controller noted above are changed with time according to the pressure in above-mentioned fixed volume cavity volume to calculate above-mentioned safety
The Opening pressure of valve.
In above-mentioned detector for safety valve, preferably above-mentioned fixation is held from above-mentioned flow controlling unit with the flow changed
Product cavity volume supply gas, controller noted above change with time and above-mentioned flow according to the pressure in above-mentioned fixed volume cavity volume
Change to calculate the Opening pressure of above-mentioned safety valve.
In above-mentioned detector for safety valve, preferably controller noted above according to the pressure in above-mentioned fixed volume cavity volume at any time
Between rate of change and the ratio between above-mentioned flow calculate the Opening pressure of above-mentioned safety valve.
In above-mentioned detector for safety valve, preferably above-mentioned flow controlling unit is flow controller, or is regulating valve
With the combination of flowmeter.
In above-mentioned detector for safety valve, preferably above-mentioned flow controlling unit is regulating valve, is detected in above-mentioned safety valve
Pair of the corresponding relation for the flow for representing the gas that the aperture of above-mentioned regulating valve is controlled with above-mentioned regulating valve is stored with device
Answer table, aperture of the controller noted above based on the corresponding table and above-mentioned regulating valve, to calculate gas that above-mentioned regulating valve controlled
Flow.
In above-mentioned detector for safety valve, preferably above-mentioned fixed volume cavity volume be the above-mentioned flow controlling unit of connection with it is upper
State the pipeline of tested safety valve.
Technique effect
In the utility model with said structure, filled because the Opening pressure of safety valve can be detected by safety valve
The pressure in fixed volume cavity volume, the flow of flow measuring and controlling unit output and the relation curve of time put carry out automatic decision and obtained
Arrive, the process is manually operated without operating personnel, and without from reading on the continually changing pressure gauge of reading, therefore, operation is simple
Just, and the precision of the Opening pressure of safety valve that detects is high, and error caused by manual operation is few.
Brief description of the drawings
Fig. 1 is the structural representation of the detector for safety valve of embodiment 1 of the present utility model.
Fig. 2 is the flow chart of the safety valve detection method of embodiment 1 of the present utility model.
Fig. 3 is the stream for the gas that fixed volume cavity volume is delivered in flow controller unit interval when representing constant flow rate
Measure the schematic diagram of versus time curve.
Fig. 4 is the schematic diagram for the curve C1 that the pressure in fixed volume cavity volume when representing constant flow rate changes over time.
Fig. 5 is showing for the ratio versus time curve C2 of the pressure change rate and mass flow when representing constant flow rate
It is intended to.
Fig. 6 is the stream for the gas that fixed volume cavity volume is delivered in flow controller unit interval when representing variable flow
Measure the schematic diagram of versus time curve.
Fig. 7 is the schematic diagram for the curve C1 that the pressure in fixed volume cavity volume when representing variable flow changes over time.
Fig. 8 is showing for the ratio versus time curve C2 of the pressure change rate and mass flow when representing variable flow
It is intended to.
Fig. 9 is the structural representation of the detector for safety valve 200 of embodiment 2 of the present utility model.
Figure 10 is the structural representation of the detector for safety valve 300 of embodiment 3 of the present utility model.
When Figure 11 is the gas flow detected in real time and the detection when representing the constant flow rate of the utility model embodiment 1
Between relation curve figure.
When Figure 12 is pressure and detection in fixed volume cavity volume when representing the constant flow rate of the utility model embodiment 1
Between relation curve figure.
Figure 13 be pressure change rate in fixed volume cavity volume when representing the constant flow rate of the utility model embodiment 1 with
The figure that the ratio of gas flow changes with time.
When Figure 14 is the gas flow detected in real time and the detection when representing the variable flow of the utility model embodiment 2
Between relation curve figure.
When Figure 15 is pressure and detection in fixed volume cavity volume when representing the variable flow of the utility model embodiment 2
Between relation curve figure.
Figure 16 be pressure change rate in fixed volume cavity volume when representing the variable flow of the utility model embodiment 2 with
The figure that the ratio of gas flow changes with time.
Description of reference numerals
100th, 200,300 detector for safety valve, 10 sources of the gas, 20 flow controllers, 30 fixed volume cavity volumes, 40 pressure pass
Sensor, 50 controllers, 60 safety valves, 221 regulating valves, 222 flowmeters, 320 regulating valves.
Embodiment
The preferred embodiment of detector for safety valve of the present utility model is carried out with embodiment below in conjunction with the accompanying drawings detailed
Describe in detail bright.In addition, in the description of the drawings, to being identically or comparably partly accompanied by same-sign, the repetitive description thereof will be omitted.
Embodiment 1
The structure of the detector for safety valve 100 of embodiment 1 of the present utility model is illustrated below.
Fig. 1 is the structural representation of the detector for safety valve 100 of embodiment 1 of the present utility model.As shown in figure 1, peace
Full valve detection means 100 includes source of the gas 10, flow controller 20, fixed volume cavity volume 30, pressure sensor 40 and controller 50.
Flow controller 20, fixed volume cavity volume 30 and pressure sensor 40 are connected so as to communicate with each other by pipeline.Safety valve detects
The fixed volume cavity volume 30 of device 100 connects with the gas circuit of the safety valve 60 as detection object of outside.Controller 50 and pressure
Force snesor 40 electrically connects.The pressure value that pressure sensor 40 can be sensed in real time is transferred to controller 50.Control
The flow value for the gas that pressure value that device 50 is provided pressure sensor 40, flow measuring and controlling unit are controlled is analyzed, so
The Opening pressure value of safety valve 60 is obtained afterwards.
Source of the gas 10 can use air pump or nitrogen cylinder, and it has the output interface of gas, via the output interface by gas
Body is supplied to flow controller 20.
Flow controller 20 is flow controlling unit, and it flows to the gas that fixed volume cavity volume 30 is flowed to from source of the gas 10
Amount regulation, so as to control the flow for the gas for entering fixed volume cavity volume 30.Flow controller 20 has two interfaces, one
Interface is connected by connecting line with the output interface of source of the gas 10, and another interface passes through connecting line and fixed volume cavity volume 30
Connection.Flow controller 20 also electrically connects with controller 50.Flow controller 20 can be with constant flow rate output gas, can also
With variable flow output gas, because the gaseous species used are constant, the flow of gas can be measured by mass flow, also may be used
To be measured by volume flow.The concrete structure of flow controller 20 does not limit, as long as the control to gas flow can be realized
System and flow obtain function.
In the present embodiment 1, flow controller 20 is the flow controller that can directly buy of in the market, the flow control
Device processed can receive the flow Setting signal Q of controller 50rAutomatically the gas flow Q exported to it is realizedyControl and measurement work(
Energy.
Fixed volume cavity volume 30 is the chamber with fixed volume, and it both can be a chamber being separately provided, and also may be used
Formed with the pipeline by connection traffic controller 20 and tested safety valve 60, the inside of safety valve 60 being not switched on can also be included
Space." having fixed volume " mentioned here, the volume referred in the detection process middle chamber to safety valve 60 keep constant.
For example, when fixed volume chamber 30 is made up of connecting pipe, connecting pipe is not because of pressure in the detection process to safety valve 60
The change of power and occur volume change.In the present embodiment 1, fixed volume cavity volume 30 have respectively with flow controller 20 and peace
The interface that full valve 60 connects, also there is the interface being connected with pressure sensor 40.The shape of the inner space of fixed volume cavity volume 30
Shape is not particularly limited, and can be any shape with a fixing internal volume, such as can be cube, cuboid, ball
Body or cylinder etc..Fixed volume cavity volume 30 receives the gas from flow controller 20, with continually entering for gas, Gu
Pressure in constant volume cavity volume 30 constantly increases.
Pressure sensor 40 is used to detect the pressure in fixed volume cavity volume 30 in real time, and it can be arranged on fixed volume appearance
It among chamber 30, can also be arranged on outside fixed volume cavity volume 30, be connected via pipe interface with fixed volume cavity volume 30.Pressure
Sensor 40 electrically connects with controller 50, and by the pressure real-time Transmission in the fixed volume cavity volume 30 measured to controller 50.
Controller 50 for example can be CPU processor, and it receives pressure data from pressure sensor 40 and to flow automatically
The data on flows of amount controller 20, analyzed to determine the state of detection process, and according to the result of analysis come to flow control
Device 20 processed provides flow setting value.Controller 50 can also include external interface, and safety valve can be examined by the external interface
Survey device 100 and carry out parameter setting, each item data of safety valve detection process can also be obtained.The external interface can include key
The human-computer interaction interface of disk and display screen, input/output port can also be included.
In addition, in order to improve level of integrated system, cost is reduced, flow controller 20 and controller 50 can also be integrated into
One entirety, used as a flow measuring and controlling unit.
Safety valve 60 is not the element inside detector for safety valve, but the detection pair of detector for safety valve 100
As.As the preset parameter of safety valve 60, there is this preset parameter of Opening pressure.When the pressure of input to safety valve 60 is less than
During the Opening pressure of safety valve 60, safety valve 60 is closed.When the pressure of input to safety valve 60 is more than safety valve 60
Opening pressure when, safety valve 60 is in open mode.When the safety valve 60 is in open mode, detector for safety valve
Gas in 100 fixed volume cavity volume 30 leaks to the external world via safety valve 60.
Herein, the operation principle of the detector for safety valve 100 in the present embodiment 1 is illustrated.Source of the gas 10 is to flow
Controller 20 provides gas, and the flow that flow controller 20 is set according to controller 50 is inflated to fixed volume cavity volume 30.
Wherein, controller 50 is controlled, and makes flow controller 20 with constant flow rate or variable flow output gas flow to fixed volume
Cavity volume 30.When safety valve 60 is closed, as fixed volume cavity volume 30 is constantly received from flow controller 20
Air-flow, the rate of pressure rise in fixed volume cavity volume 30 is directly proportional to the flow that gas flows into, and both ratios are constant, work as pressure
After being increased to certain value, safety valve 60 is set to be in open mode, a part of gas is discharged into fixed volume via safety valve 60
Outside cavity volume 30, now, the rate of pressure rise and the ratio of gas flow diminish.Pressure sensor 40 in real time fix by measurement
Pressure in volume cavity volume 30, and the pressure value measured in real time is exported to controller 50.Flow controller 20 measures in real time
Its gas flow exported, and the gas flow values measured in real time are exported to controller 50.Controller 50 is according to by flow
The gas flow and pressure value that controller 20 and pressure sensor 40 provide, calculate the Opening pressure of safety valve 60.
Hereinafter, the specific steps of the safety valve detection method using above-mentioned detector for safety valve 100 are illustrated.
Fig. 2 is the flow chart of the safety valve detection method of embodiment 1 of the present utility model.As shown in Fig. 2 safety valve detects
Method comprises the following steps：
Step S1, the gas circuit of the fixed volume cavity volume 30 in detector for safety valve 100 and safety valve 60 to be detected is connected
After connecing, source of the gas 10 is opened, source of the gas 10 supplies the gas with certain pressure to flow controller 20, makes flow controller 20
With defined flow to the supply gas of fixed volume cavity volume 30, and export the data on flows on the gas；
Step S2, pressure sensor 40 is set to detect the pressure in fixed volume cavity volume 30, and output pressure testing number in real time
According to；With
Step S3, utilize the instantaneous delivery of the gas collected respectively by flow controller 20 and pressure sensor 40 and solid
Instantaneous pressure inside constant volume cavity volume 30, draw curve C1 and pressure that the pressure in fixed volume cavity volume 30 changes over time
The ratio versus time curve C2 of rate of change and flow, and according to curve C1 and curve C2, determine the unlatching of safety valve
Pressure.
In addition, safety valve detection method can also include step S4, after recording the Opening pressure determined in above step S3,
Change the flow for the gas that the flow controller 20 in step S2 exports, repaint curve C1 and curve C2, determine safety valve
Opening pressure.
Hereinafter, further illustrating makes flow controller 20 come with constant flow rate and the two ways of variable flow output gas
The method for determining the Opening pressure of safety valve.
(measuring method of constant flow rate)
Fig. 3 is the gas that fixed volume cavity volume 30 is delivered in the unit interval of flow controller 20 when representing constant flow rate
Flow versus time curve schematic diagram.Q (t) is meant that in the unit interval of flow controller 20 and is delivered in Fig. 3
The gas flow of fixed volume cavity volume 30, i.e. instantaneous delivery, the flow can be measured by volume flow as described above, can also be by
Mass flow is measured.In the case of constant flow rate, it is delivered in the unit interval of flow controller 20 and states fixed volume cavity volume
The volume or quality of 30 gas are a steady state value, i.e. Qc.Q (t) is illustrated in the case of constant flow rate in Fig. 3 over time
Change turn to a steady state value.
Fig. 4 is the signal for the curve C1 that the pressure in the fixed volume cavity volume 30 when representing constant flow rate changes over time
Figure.As shown in figure 4, when flow controller 20 is with constant flow rate output gas flow to fixed volume cavity volume 30, fixed volume cavity volume
The relation of pressure and time in 30 is the straight line that a slope is fixed, and the slope of the straight line is represented in fixed volume cavity volume 30
Rate of pressure rise.As the pressure in fixed volume cavity volume 30 gradually rises, when the pressure in fixed volume cavity volume 30 reaches
During the Opening pressure of safety valve 60, safety valve 60 switches to open mode by closed mode, now in fixed volume cavity volume 30
Gas leaks to the external world via safety valve 60, and then, the rate of pressure rise in fixed volume cavity volume 30 declines.In constant flow rate
In the case of, the curve that directly can be changed over time by the pressure in fixed volume cavity volume 30 judges the unlatching of safety valve 60
Pressure.Specifically, carry out over time in Fig. 4, pressure curve is initially the straight line that a slope is fixed, when safety valve 60 is beaten
Rear gas discharge is opened, the slope of pressure curve reduces, but pressure also is continuing to increase.For example, make in Fig. 4 initial straight
The extended line of line, the point of contact of itself and pressure curve latter half are the point that safety valve 60 is opened, time t corresponding to the point0For
The time that safety valve 60 is opened, pressure P corresponding to the point0For the Opening pressure of safety valve 60.
Fig. 5 is the ratio versus time curve C2 of the pressure change rate and flow when representing constant flow rate signal
Figure.R (t) in Fig. 5 represents the ratio of pressure change rate and flow, and it is calculated by following calculating formula (1).
Wherein, P (t) represents the pressure in the fixed volume cavity volume 30 of t.
In the case of constant flow rate, R (t) is a steady state value, i.e. Rc.When the pressure in fixed volume cavity volume 30 reaches peace
During the Opening pressure of full valve 60, safety valve 60 switches to open mode by closed mode, now, the curve that R (t) is changed over time
It will decline, produce a flex point, t at the time of this flex point producesoIt is exactly that safety valve 60 switches to open shape by closed mode
At the time of state.In step s3, moment t is determined according to Fig. 3oPressure P in corresponding fixed volume cavity volume 300, the pressure is
For the Opening pressure of safety valve 60.
(measuring method of variable flow)
Fig. 6 is the gas that fixed volume cavity volume 30 is delivered in the unit interval of flow controller 20 when representing variable flow
Flow versus time curve schematic diagram.Q (t) is meant that in the unit interval of flow controller 20 and is delivered in Fig. 6
The gas flow of fixed volume cavity volume 30, i.e. instantaneous delivery, the flow can be measured by volume flow as described above, can also be by
Mass flow is measured.When the flow is variable flow, the change of flow over time is that do not have well-regulated, and it can be
The curve of arbitrary shape.
Fig. 7 is the signal for the curve C1 that the pressure in the fixed volume cavity volume 30 when representing variable flow changes over time
Figure.As shown in fig. 7, when flow controller 20 is with variable flow output gas flow to fixed volume cavity volume 30, fixed volume cavity volume
Pressure in 30 gradually rises with the time, but elevated speed, which is slope, does not fix.Therefore, the pressure in fixed volume cavity volume 30
Power and the relation of time are the unfixed curve of the slope gradually risen.In the case of variable flow, such as it can also pass through
The point of contact of pressure curve latter half in Fig. 7 determines the Opening pressure of safety valve 60, but in order to further improve precision, it is excellent
Choosing determines the Opening pressure of safety valve using the ratio versus time curve of following pressure change rate and flow.
Fig. 8 is the ratio versus time curve C2 of the pressure change rate and flow when representing variable flow signal
Figure.R (t) in Fig. 8 represents the ratio of pressure change rate and flow, and it is calculated by following calculating formula (2).
Wherein, P (t) represents the pressure in the fixed volume cavity volume 30 of t.
Due to being inflated to the fixed volume cavity volume 30 with fixed volume, therefore, in the case of variable flow, R (t)
For a steady state value, i.e. Rc.When the pressure in fixed volume cavity volume 30 reaches the Opening pressure of safety valve 60, safety valve 60 is by closing
Closed state switches to open mode, and now, the curve that R (t) is changed over time will decline, and produces a flex point, this flex point
T at the time of generationoAt the time of being exactly that safety valve 60 switches to open mode by closed mode.In step s3, determined according to Fig. 6
Go out moment toPressure P in corresponding fixed volume cavity volume 300, the pressure is the Opening pressure of safety valve 60.
An embodiment of the present utility model in accordance with the above, because the Opening pressure of safety valve 60 can pass through safety
The flow and the relation curve of time that pressure, flow controller 20 in the fixed volume cavity volume 30 of valve detection device 100 export
To carry out automatic decision to obtain, the process is manually operated without operating personnel, without from reading on the continually changing pressure gauge of reading,
Therefore, it is easy to operate, and the precision of the Opening pressure of the safety valve detected is high, error caused by manual operation is few.
In addition, detector for safety valve 100 can also include the human-computer interaction interface electrically connected with controller 50, in the people
Machine interactive interface can show the Opening pressure value of safety valve 60.Thus, the Opening pressure of safety valve 60 can be examined in safety valve
The man-machine interface for surveying device 100 is directly read, and can also be obtained via data-interface, therefore, can be made detector for safety valve
100 Opening pressures more directly perceived that safety valve 60 is easily provided.In addition, user can also utilize human-computer interaction interface input to use
In the various parameters of detection, such as the initial flow of the initial pressure of source of the gas 10, supply gas, and it is to use constant flow rate also
It is to be detected etc. using variable flow, the detection of detector for safety valve 100 can be controlled via controller 50.
Embodiment 2
In embodiment 1 more than, to the detector for safety valve 100 with flow controller 20 and its detection is used
Method is illustrated.With the difference of the embodiment 1, in the present embodiment 2, as flow controlling unit, using regulating valve and
The combination of flowmeter substitutes flow controller 20.That is, in the present embodiment 2, as flow controlling unit, tune is used
Save valve and flowmeter.Remaining structure is same as Example 1, in this description will be omitted.
Fig. 9 is the structural representation of the detector for safety valve 200 of embodiment 2 of the present utility model.As shown in figure 9, peace
Full valve detection means 200, the difference with the detector for safety valve 100 of embodiment 1 are there is regulating valve 221 and flowmeter
222, as flow controlling unit.Regulating valve 221 and flowmeter 222 electrically connect with controller 50 respectively, regulating valve 221 also with gas
Source 10 connects with the pipeline of fixed volume cavity volume 30.Flowmeter 222 can measure the flow of the gas exported from regulating valve 221
Qy, regulating valve 221, which is received from the opening amount signal u that the conveying of controller 50 comes, changes opening degree, and regulating valve 221 can be switch
Valve or proportioning valve.Controller 50 automatically adjusts the switch ratio of regulating valve 221 according to the feedback of flowmeter 222 or opens ratio
Rate, so that gas flow QyMeet the requirement of the safety valve detection method in embodiment 1.
In the present embodiment 2, it can be come true by the method same with the safety valve detection method described in embodiment 1
The Opening pressure of Dingan County's full valve 60.
By the present embodiment 2, above-mentioned technique effect similarly to Example 1 can be also obtained.
(embodiment 3)
In embodiment 1 more than, to the detector for safety valve 100 with flow controller 20 and its detection is used
Method is illustrated.With the difference of the embodiment 1, in the present embodiment 3, as flow controlling unit, single tune is used
Valve is saved to substitute flow controller 20.Remaining structure is same as Example 1, in this description will be omitted.
Figure 10 is the structural representation of the detector for safety valve 300 of embodiment 3 of the present utility model.As shown in Figure 10,
Detector for safety valve 300, the difference with the detector for safety valve 100 of embodiment 1 are that there is regulating valve 320 to be used as
Flow controlling unit.Regulating valve 320 can be a switch valve or proportioning valve, and regulating valve 320 electrically connects with controller 50, and with
Source of the gas 10 connects with the pipeline of fixed volume cavity volume 30.Regulating valve 320 is controlled by controller 50, and controller 50 can control the tune
The opening degree of valve is saved, to adjust the flow of the gas by regulating valve 320.In the present embodiment 3, it is necessary in advance to regulating valve
320 characteristic is modeled so that the aperture and its both ends that the flow of the reality output of regulating valve 320 can be according to regulating valve 320
Calculation of pressure obtains, the flow of the gas that controller 50 is calculated and obtained by the running status of regulating valve 320Thus
Perform safety valve detection method.That is, be stored with detector for safety valve 300 represent regulating valve 320 aperture with
The corresponding table of the corresponding relation of the flow for the gas that regulating valve 320 is controlled, controller 50 are based on the corresponding table and regulating valve 320
Aperture, to calculate the flow of gas that regulating valve 320 controlled.
In the present embodiment 3, it can be come true by the method same with the safety valve detection method described in embodiment 1
The Opening pressure of Dingan County's full valve 60.
By the present embodiment 3, above-mentioned technique effect similarly to Example 1 can be also obtained.
(embodiment 1)
Hereinafter, illustrate to actually use detector for safety valve of the present utility model using Figure 11~Figure 13 to detect safety
One embodiment of the Opening pressure of valve.
In the present embodiment 1, examined using the detector for safety valve 100 of embodiment 1 with the measuring method of constant flow rate
The Opening pressure of safety valve is surveyed, fixed volume cavity volume 30 is by a gas appearance and connection traffic control unit and tested safety valve
Pipeline is formed, total measurement (volume) 300mL.As described above, in detector for safety valve 100, stream has been used as flow controlling unit
Amount controller 20, it can realize the control of the gas flow exported to it and measurement function automatically.
In the present embodiment 1, after detector for safety valve 100 is connected with the gas circuit of safety valve 60 to be detected, gas is opened
Source 10, source of the gas 10 supply the gas with certain pressure to flow controller 20, and flow controller 20 is according to control unit
Control signal, the flow of the gas exported to fixed volume cavity volume 30 is remained into approximately constant value.Wherein, source of the gas 10 supplies
The initial pressure of gas is substantially 723KPa, and detection time is substantially 50 seconds.
Gas flow and detection of the supply that Figure 11 expression flow controllers 20 detect in real time to fixed volume cavity volume 30
The relation curve of time.According to Figure 11 as can be seen that the change over time of the flow measured of flow controller 20 and keep
For the value of constant, that is, maintain substantially 6 public liter/min (NLPM).
Figure 12 represents the pass of the pressure and detection time in the fixed volume cavity volume 30 that pressure sensor 40 detects in real time
It is curve.According to Figure 12 as can be seen that the pressure in fixed volume cavity volume 30 is gradually increasing with constantly gas is supplied to, its
Elevated speed is that slope is roughly the same, and this is caused because supplying to the gas flow constant of fixed volume cavity volume 30
's.In addition, declining after the pressure in fixed volume cavity volume 30 reaches some value, remained then as the change of time big
Fixed value is caused, this is considered because safety valve 60 is from caused by closed mode switches to opening.Therefore, according to Figure 12
In the relation curve can also generally determine the Opening pressure of safety valve 60, it is, can be by fixed volume cavity volume
Pressure value when pressure in 30 is begun to decline, that is, produce the Opening pressure that the pressure value at flex point is defined as safety valve.
In addition, in order to further improve precision, can also be by the ratio of following pressure change rate and flow with the time
Change curve determine the Opening pressure of safety valve.
Figure 13 represents the ratio for the flow that the pressure change rate in fixed volume cavity volume 30 is measured with flow controller 20
Change with time result.The result is calculated based on the measurement result in Figure 11 and Figure 12 by above-mentioned calculating formula (1).
According to Figure 13 it is recognised that the ratio of pressure change rate and flow is originally substantially without change, but during arrival detection
Between the 19.14th second when, the ratio of pressure change rate and flow strongly reduces.The ratio of the pressure change rate and flow is drastically
Reduction is considered because safety valve 60 is from caused by closed mode switches to opening, so as to think that safety valve 60 exists
The 19.14th second of detection time is opened, that is, determines start-up time t0For 19.14 seconds.
Then, the relation curve of the pressure according to Figure 12 and detection time, it is capable of determining that start-up time t0Institute is right
The pressure value answered is 507.7KPa, and the pressure value is defined as to the Opening pressure P of safety valve 600。
In fig. 13, due to from closed mode switching to opening with safety valve 60, pressure change rate and flow
Ratio sharp reduces, therefore, compared to the curve shown in Figure 12, can be more prone to and accurately confirm safety valve 60 from
At the time of closed mode switches to opening, the Opening pressure P of the safety valve 60 determined based on the moment0Also it is more accurate.
Further, since in the measuring method of the constant flow rate of embodiment 1, the gas stream to fixed volume cavity volume 30 is supplied
Amount remains constant, therefore, even if the ratio for the flow measured without using pressure change rate and flow controller 20, and
Using only pressure change rate, the Opening pressure P of safety valve 60 can be also detected substantially in the same manner0。
(embodiment 2)
Hereinafter, illustrate to actually use detector for safety valve of the present utility model using Figure 14~Figure 16 to detect safety
One embodiment of the Opening pressure of valve.
In the present embodiment 2, examined using the detector for safety valve 200 of embodiment 2 with the measuring method of variable flow
The Opening pressure of safety valve is surveyed, fixed volume cavity volume 30 is equally held by a gas and connection traffic control unit and tested safety valve
Pipeline form, total measurement (volume) 300mL.As described above, the detector for safety valve 200 of embodiment 2, as flow controlling unit
Regulating valve 221 and flowmeter 222 are used.
In the present embodiment 2, after detector for safety valve 200 is connected with the gas circuit of safety valve 60 to be detected, gas is opened
Gas with certain pressure is supplied to regulating valve 221, flowmeter 222 and measured from regulating valve 221 to fixation by source 10, source of the gas 10
The flow for the gas that volume cavity volume 30 exports.Wherein, the initial pressure for the gas that source of the gas 10 supplies is substantially 646KPa, regulating valve
221 initial valve opening is 0.460, and detection time is substantially 50 seconds.
Gas flow and detection time of the supply that Figure 14 expression flowmeters 222 detect in real time to fixed volume cavity volume 30
Relation curve.According to Figure 14 as can be seen that the change over time of the flow measured of flowmeter 222 and change.
Figure 15 represents the pass of the pressure and detection time in the fixed volume cavity volume 30 that pressure sensor 40 detects in real time
It is curve.According to Figure 15 as can be seen that the pressure in fixed volume cavity volume 30 is gradually increasing with constantly gas is supplied to, its
Elevated speed is that slope is not fixed, and this is because caused by constantly changing the gas flow supplied to fixed volume cavity volume 30.
In addition, declining after the pressure in fixed volume cavity volume 30 reaches some value, remained substantially then as the change of time
Fixed value, this is considered because safety valve 60 is from caused by closed mode switches to opening.Therefore, according in Figure 15
The relation curve can also generally determine the Opening pressure of safety valve 60, it is, can be by fixed volume cavity volume 30
Pressure value when interior pressure is begun to decline, that is, the pressure value for producing the pressure value at flex point are defined as the unlatching pressure of safety valve
Power.
In addition, in order to further improve precision, can also be by the ratio of following pressure change rate and flow with the time
Change curve determine the Opening pressure of safety valve.
Figure 16 represents the ratio for the flow that the pressure change rate in fixed volume cavity volume 30 is measured with flowmeter 222 at any time
Between result of variations.The result is calculated based on the measurement result in Figure 14 and Figure 15 by above-mentioned calculating formula (2).
According to Figure 16 it is recognised that the ratio of pressure change rate and flow is originally substantially without change, but during arrival detection
Between the 32.22nd second when, the ratio of pressure change rate and flow strongly reduces.The ratio of the pressure change rate and flow is drastically
Reduction is considered because safety valve 60 is from caused by closed mode switches to opening, so as to think that safety valve 60 exists
The 32.22nd second of detection time is opened, that is, determines start-up time t0For 32.22 seconds.
Then, the relation curve of the pressure according to Figure 15 and detection time, it is capable of determining that start-up time t0Institute is right
The pressure value answered is 499.74KPa, and the pressure value is defined as to the Opening pressure P of safety valve 600。
In figure 16, due to from closed mode switching to opening with safety valve 60, pressure change rate and flow
Ratio sharp reduces, therefore, compared to the curve shown in Figure 15, can be more prone to and accurately confirm safety valve 60 from
At the time of closed mode switches to opening, the Opening pressure P of the safety valve 60 determined based on the moment0Also it is more accurate.
It can be seen from above example 1,2, by above-mentioned detector for safety valve of the present utility model, detection process without
Need operating personnel manually operated, being capable of easy to operate and precision highland without from reading on the continually changing pressure gauge of reading
The Opening pressure of the safety valve detected.
In above example 1,2, the detector for safety valve 100 with flow controller 20 of embodiment 1 has been used
There is the detector for safety valve 200 of regulating valve 221 and flowmeter 222 with embodiment 2 to detect the Opening pressure of safety valve,
But those skilled in the art will know that pass through aperture and the corresponding relation of gas flow with regulating valve 320 and expression regulating valve
Corresponding table detector for safety valve 300, can also obtain the same technique effect of the above.
In addition, in above example 1,2, fixed volume cavity volume is by a gas appearance and connection traffic control unit and quilt
The pipeline for surveying safety valve is formed, but the utility model not limited to this, and fixed volume cavity volume only can also be controlled single by connection traffic
It is first to be formed with the pipeline of tested safety valve, so as to minimize detector for safety valve.In addition, the appearance of fixed volume cavity volume
Product is also not particularly limited, and can suitably be set according to the flow etc. of the gas pressure of gas supply source, supply gas, only
If keeping constant to being tested in the detection process of safety valve.
The utility model is not limited to above-mentioned embodiment, but contains various modifications example.Above-mentioned embodiment is
For the detailed description that the utility model is illustrated and carried out with being easily understood, and it is non-limiting must possess it is illustrated whole
Structure.In addition, the structure of each part, connected mode etc. are not limited to this, it is every on the basis of technical solutions of the utility model
The equivalents of progress and improvement, belong to the utility model and disclose scope.
Claims (4)
- A kind of 1. detector for safety valve for the Opening pressure for detecting safety valve, it is characterised in that including：The gas supply source of gas is provided；The fixed volume cavity volume with fixed volume being connected with tested safety valve；Flow controlling unit, it is arranged between the gas supply source and the fixed volume cavity volume, is controlled in real time from described Gas supply source supplies the flow of the gas to the fixed volume cavity volume；Pressure sensor, it detects the pressure in the fixed volume cavity volume, and output pressure detection data in real time；WithController, it is controlled to the flow controlling unit makes the flow controlling unit with defined flow to described solid Constant volume cavity volume supply gas, and the flow of the gas controlled according to the flow controlling unit and the pressure detection data Determine the Opening pressure of the safety valve.
- 2. detector for safety valve according to claim 1, it is characterised in that：The flow controlling unit is flow controller.
- 3. detector for safety valve according to claim 1, it is characterised in that：The flow controlling unit is the combination of regulating valve and flowmeter.
- 4. according to detector for safety valve according to any one of claims 1 to 3, it is characterised in that：The fixed volume cavity volume is the pipeline of the connection flow controlling unit and the tested safety valve.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109186982A (en) * | 2018-09-25 | 2019-01-11 | 芜湖优能自动化设备有限公司 | A kind of pressure-detecting device for relief valve |
| CN109238686A (en) * | 2017-07-06 | 2019-01-18 | 北京康斯特仪表科技股份有限公司 | Detector for safety valve and safety valve detection method |
| CN113532728A (en) * | 2021-07-08 | 2021-10-22 | 广州小鹏智慧充电科技有限公司 | Method and device for determining valve opening pressure value of explosion-proof valve in battery pack |
| WO2021249099A1 (en) * | 2020-06-12 | 2021-12-16 | 维景医疗科技(浙江)有限公司 | Structure for maintaining insufflation pressure and flow |
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2017
- 2017-07-06 CN CN201720815672.7U patent/CN207007487U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238686A (en) * | 2017-07-06 | 2019-01-18 | 北京康斯特仪表科技股份有限公司 | Detector for safety valve and safety valve detection method |
| CN109186982A (en) * | 2018-09-25 | 2019-01-11 | 芜湖优能自动化设备有限公司 | A kind of pressure-detecting device for relief valve |
| WO2021249099A1 (en) * | 2020-06-12 | 2021-12-16 | 维景医疗科技(浙江)有限公司 | Structure for maintaining insufflation pressure and flow |
| CN113532728A (en) * | 2021-07-08 | 2021-10-22 | 广州小鹏智慧充电科技有限公司 | Method and device for determining valve opening pressure value of explosion-proof valve in battery pack |
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