CN113340527B - Differential pressure transmitter verification system - Google Patents
Differential pressure transmitter verification system Download PDFInfo
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- CN113340527B CN113340527B CN202110601681.7A CN202110601681A CN113340527B CN 113340527 B CN113340527 B CN 113340527B CN 202110601681 A CN202110601681 A CN 202110601681A CN 113340527 B CN113340527 B CN 113340527B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
Abstract
The invention discloses a differential pressure transmitter verification system, relates to the technical field of differential pressure transmitter verification equipment, and mainly aims to provide a differential pressure transmitter verification system which can quickly, conveniently and accurately verify and calibrate a differential pressure transmitter and a differential pressure flowmeter. The main technical scheme of the invention is as follows: a differential pressure transmitter verification system, comprising: the pressure gauge part, check-up part and supply the pressure part, provide standard pressure value to differential pressure transmitter's high-pressure end through the pressure gauge part, provide reference pressure for the low pressure end through supplying the pressure part, the check-up part comprises two sets of check gauges that communicate each other, set up the bypass valve between two check gauges, can connect or keep apart differential pressure transmitter's both ends through opening or closing of bypass valve, play the effect that produces differential pressure value, thereby reach quick realization, convenience, accurate examination and calibration work to differential pressure transmitter, differential pressure flowmeter. The invention is mainly used for detecting the differential pressure transmitter.
Description
Technical Field
The invention relates to the technical field of differential pressure transmitter verification equipment, in particular to a differential pressure transmitter verification system.
Background
The pressure transmitter is a transmitter widely used at present, is an instrument for converting a pressure variable into a transmittable standardized output signal, has a certain continuous linear relation between the output signal and the pressure variable, and is mainly used for measuring and controlling pressure parameters of an industrial process. The differential pressure transmitter can form a differential pressure flowmeter with other flow meters for integrating the flow, is a product related to the civil metering and energy metering of trade settlement, and is also a metering instrument most easily generating trade disputes. Therefore, whether the metering of the differential pressure transmitter is accurate or not is directly related to the benefits of both the supply and demand parties, and the verification process of the differential pressure transmitter is particularly important.
Currently, differential pressure transmitters are typically calibrated with the low pressure side vented to the atmosphere, but practical applications in which differential pressure transmitters are used in the field include high static pressure values at both the high and low ports of the transmitter. For a differential pressure transmitter with poor static pressure performance, the detection result can drift greatly under high static pressure, and if corresponding static pressure is not applied during verification of the differential pressure transmitter, the accuracy of the verification result can be reduced.
The existing high-static-pressure gas differential pressure piston type pressure gauge has high precision, the working principle of the pressure gauge is that the pressurization is realized by manually adjusting the gas pressure, the difference is that the pressure of a piston device is controlled by applying a special weight, and a digital device is controlled by a built-in sensor.
According to the existing differential pressure calibration method of the double-channel digital pressure instrument mode, a high-low pressure port of a differential pressure instrument is respectively connected with two mutually independent channels of the digital pressure instrument, the pressure value of the high-low pressure port meets the static pressure requirement of the differential pressure instrument through manual or automatic control, the pressure of the high-low pressure port is isolated at the moment, and the digital pressure instrument is used for controlling the pressure at the high pressure end, so that a system reaches a standard differential pressure value, and the purpose of calibrating the differential pressure instrument is achieved. The method for calibrating the differential pressure of the double-channel digital pressure instrument is mainly realized through a double-channel pressure controller, but the method for calibrating the differential pressure of the double-channel digital pressure instrument can only be used for calibrating a low-static-pressure differential pressure instrument, and the biggest problem is that the accuracy and the resolution of differential pressure calibration are inevitably reduced while the digital pressure instrument meets high static pressure.
Disclosure of Invention
In view of this, embodiments of the present invention provide a differential pressure transmitter verification system, and mainly provide a differential pressure transmitter verification system that can quickly, conveniently, and accurately verify and calibrate a differential pressure transmitter and a differential pressure flowmeter.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a verification system for a differential pressure transmitter, which comprises:
the pressure gauge component comprises a piston cylinder and a piston body, and the piston body is arranged on the piston cylinder;
the calibration component comprises an air supply connecting pipe, an air exhaust connecting pipe, a first regulator, a second regulator, a low-pressure test pipe, a low-pressure reference pipe, a high-pressure test pipe, a high-pressure reference pipe and a reference pressure gauge, wherein one end of the air supply connecting pipe is connected with the first regulator, one end of the high-pressure test pipe is connected with the first regulator, the other end of the high-pressure test pipe is used for being connected with the pressure gauge component, the high-pressure test pipe is communicated with the high-pressure reference pipe, the air exhaust connecting pipe is connected with the first regulator, one end of the low-pressure test pipe is connected with the second regulator, the other end of the low-pressure test pipe is used for being connected with the pressure supply component, the reference pressure gauge, the high-pressure reference pipe and the low-pressure reference pipe are communicated with each other, the low-pressure test pipe is communicated with the low-pressure reference pipe, the low-pressure test pipe is communicated with the high-pressure test pipe, the calibration component further comprises a bypass valve, and the bypass valve is arranged between the low-pressure test pipe and the high-pressure test pipe;
supply to press the part, supply to press the part to include control unit, intake pipe, atmospheric pressure sensor, standard pressure sensor, gas circuit control unit and outlet duct, atmospheric pressure sensor's one end connect in control unit, the other end connect in the intake pipe, gas circuit control unit's one end is connected in control unit, and the other end is connected in the outlet duct, standard pressure sensor's one end connect in control unit, the other end connect in the outlet duct, the outlet duct connect in low pressure reference pipe or high pressure reference pipe.
Further, the verification component further includes a first counter balance valve disposed within the first regulator and a second counter balance valve disposed within the second regulator.
Furthermore, the verification part further comprises an air inlet valve and an air outlet valve, the air inlet valve is arranged between the air supply connecting pipe and the first regulator, and the air outlet valve is arranged between the air outlet connecting pipe and the first regulator.
Further, the verification component further comprises a filter, and the filter is arranged on the air supply connecting pipe, the low-pressure reference pipe and the high-pressure reference pipe.
Further, the pressure supply component further comprises a relay card, and the relay card is arranged between the air path control component and the control component.
Further, the pressure supply component further comprises a data acquisition component, the data acquisition component comprises a temperature sensor and a humidity sensor, and the temperature sensor and the humidity sensor are respectively connected to the control component.
Further, the pressure supply component further comprises a display component, and the display component is connected to the control component.
Further, the check unit may further include a return line disposed between the low pressure reference line and the second regulator, and a check valve disposed on the return line.
Further, the gas circuit control part comprises a gas-containing cavity, a first main gas pipe, a second main gas pipe, a first branch gas pipe, a second branch gas pipe, a third branch gas pipe, a first flow valve, a second flow valve, a first pinhole valve, a second pinhole valve and a plurality of electromagnetic valves, one end of the first main gas pipe is connected with the relay card, the other end of the first main gas pipe is connected with the gas-containing cavity, one end of the second main gas pipe is connected with the gas-containing cavity, the other end of the second main gas pipe is connected with the gas outlet pipe, two ends of the first branch gas pipe are respectively connected with the first main gas pipe and the gas-containing cavity, two ends of the third branch gas pipe are respectively connected with the second branch gas pipe and the gas-containing cavity, the first flow valve is arranged on the first main gas pipe, the second flow valve is arranged on the second main gas pipe, the first pinhole valve is arranged on the first branch gas pipe, the second main gas pipe, the second branch gas pipe and the second branch gas pipe are all arranged on the second branch gas-containing cavity.
Further, the gas circuit control component also comprises a pressure sensor, and the pressure sensor is connected to the gas-containing cavity.
Compared with the prior art, the invention has the following technical effects:
in the technical scheme provided by the embodiment of the invention, the pressure gauge component is used for providing a standard pressure value for the high-pressure end of the differential pressure transmitter and comprises a piston cylinder and a piston body, wherein the piston body is arranged on the piston cylinder; the checking component is used for generating a differential pressure value and comprises an air supply connecting pipe, an air exhaust connecting pipe, a first regulator, a second regulator, a low-pressure test pipe, a low-pressure reference pipe, a high-pressure test pipe, a high-pressure reference pipe and a reference pressure gauge, wherein one end of the air supply connecting pipe is connected to the first regulator, one end of the high-pressure test pipe is connected to the first regulator, the other end of the air supply connecting pipe is used for being connected to the pressure gauge component, the high-pressure test pipe and the high-pressure reference pipe are mutually communicated, the air exhaust connecting pipe is connected to the first regulator, one end of the low-pressure test pipe is connected to the second regulator, the other end of the low-pressure test pipe is used for being connected to the pressure supply component, the reference pressure gauge, the high-pressure reference pipe and the low-pressure reference pipe are mutually communicated, the low-pressure test pipe and the high-pressure test pipe are mutually communicated, and the checking component also comprises a bypass valve, and the bypass valve is arranged between the low-pressure test pipe and the high-pressure test pipe; the effect of the pressure supply part is to increase pressure for the low pressure end, and can provide system pressure, the pressure supply part includes control unit, the intake pipe, atmospheric pressure sensor, standard pressure sensor, gas circuit control part and outlet duct, atmospheric pressure sensor's one end is connected in control unit, the other end is connected in the intake pipe, gas circuit control part's one end is connected in control unit, the other end is connected in the outlet duct, standard pressure sensor's one end is connected in control unit, the other end is connected in the outlet duct, the outlet duct is connected in low pressure reference pipe or high pressure reference pipe, for prior art, through linking to each other with two mutually independent passageways of digital pressure instrument respectively with differential pressure instrument high-low pressure port, through manual or automatic control, make high-low pressure port pressure value reach differential pressure instrument's static pressure requirement, at this moment keep apart high-low pressure port pressure, reuse digital pressure instrument is at high pressure end control pressure, make the system reach standard differential pressure value, reach differential pressure instrument's purpose of calibration. The method for calibrating the differential pressure of the double-channel digital pressure instrument is mainly realized through a double-channel pressure controller, but the method for calibrating the differential pressure of the double-channel digital pressure instrument can only be used for calibrating a low-static pressure differential pressure instrument, and the biggest problem is that the digital pressure instrument can inevitably reduce the accuracy and the resolution of differential pressure calibration while meeting high static pressure.
Drawings
FIG. 1 is a schematic diagram of a system for calibrating a differential pressure transmitter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a verification component according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pressure supply component according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air path control component according to an embodiment of the present invention;
fig. 5 is a comparison diagram of differential pressure transmitters numbered 1, 2, 3, 4 in a static control mode and a dynamic control mode.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, an embodiment of the present invention provides a system for calibrating a differential pressure transmitter, including:
the pressure gauge component comprises a piston cylinder 11 and a piston body 12, and the piston body 12 is arranged on the piston cylinder 11;
the checking part comprises an air supply connecting pipe 21, an air exhaust connecting pipe 22, a first regulator 23, a second regulator 24, a low-pressure testing pipe 25, a low-pressure reference pipe 26, a high-pressure testing pipe 27, a high-pressure reference pipe 28 and a reference pressure gauge 29, one end of the air supply connecting pipe 21 is connected to the first regulator 23, one end of the high-pressure testing pipe 27 is connected to the first regulator 23, the other end of the high-pressure testing pipe 27 is used for being connected with the pressure gauge part, the high-pressure testing pipe 27 and the high-pressure reference pipe 28 are communicated with each other, the air exhaust connecting pipe 22 is connected to the first regulator 23, one end of the low-pressure testing pipe 25 is connected to the second regulator 24, the other end of the low-pressure testing pipe 25 is used for being connected with the pressure supply part, the reference pressure gauge 29, the high-pressure reference pipe 28 and the low-pressure reference pipe 26 are communicated with each other, the low-pressure testing pipe 25 and the high-pressure testing pipe 27 are communicated with each other, the checking part further comprises a bypass valve 20, and the bypass valve 20 is arranged between the low-pressure testing pipe 25 and the high-pressure testing pipe 27;
and the pressure supply part comprises a control part 31, an air inlet pipe 32, an atmospheric pressure sensor 33, a standard pressure sensor 34, an air path control part 35 and an air outlet pipe 36, one end of the atmospheric pressure sensor 33 is connected to the control part 31, the other end of the atmospheric pressure sensor 33 is connected to the air inlet pipe 32, one end of the air path control part 35 is connected to the control part 31, the other end of the air path control part is connected to the air outlet pipe 36, one end of the standard pressure sensor 34 is connected to the control part 31, the other end of the standard pressure sensor is connected to the air outlet pipe 36, and the air outlet pipe 36 is connected to the low-pressure reference pipe 26 or the high-pressure reference pipe 28.
In the technical scheme provided by the embodiment of the invention, the pressure gauge component is used for providing a standard pressure value for the high-pressure end of the differential pressure transmitter, and comprises a piston cylinder 11 and a piston body 12, wherein the piston body 12 is arranged on the piston cylinder 11; the checking component is used for generating a differential pressure value and comprises an air supply connecting pipe 21, an air exhaust connecting pipe 22, a first regulator 23, a second regulator 24, a low-pressure testing pipe 25, a low-pressure reference pipe 26, a high-pressure testing pipe 27, a high-pressure reference pipe 28 and a reference pressure gauge 29, one end of the air supply connecting pipe 21 is connected to the first regulator 23, one end of the high-pressure testing pipe 27 is connected to the first regulator 23, the other end of the high-pressure testing pipe 27 is used for being connected with the pressure gauge component, the high-pressure testing pipe 27 is communicated with the high-pressure reference pipe 28, the air exhaust connecting pipe 22 is connected to the first regulator 23, one end of the low-pressure testing pipe 25 is connected to the second regulator 24, the other end of the low-pressure testing pipe 25 is used for being connected with a pressure supply component, the reference pressure gauge 29, the high-pressure reference pipe 28 and the low-pressure reference pipe 26 are communicated with each other, the low-pressure testing pipe 25 and the high-pressure testing pipe 27, the checking component further comprises a bypass valve 20, and the bypass valve 20 is arranged between the low-pressure testing pipe 25 and the high-pressure testing pipe 27; the pressure supply part is used for increasing the pressure of the low-pressure end and providing the system pressure, the pressure supply part comprises a control part 31, an air inlet pipe 32, an atmospheric pressure sensor 33, a standard pressure sensor 34, an air path control part 35 and an air outlet pipe 36, one end of the atmospheric pressure sensor 33 is connected with the control part 31, the other end is connected with the air inlet pipe 32, one end of the air path control part 35 is connected with the control part 31, the other end is connected with the air outlet pipe 36, one end of the standard pressure sensor 34 is connected with the control part 31, the other end is connected with the air outlet pipe 36, the air outlet pipe 36 is connected with the low-pressure reference pipe 26 or the high-pressure reference pipe 28, compared with the prior art, the pressure value of the high-pressure port and the low-pressure port of the differential pressure gauge can reach the static pressure requirement of the differential pressure gauge through manual or automatic control, and then the pressure of the high-pressure port and the low pressure port can be isolated, the pressure is controlled at the high-pressure end by a digital pressure instrument, so that the system reaches a standard differential pressure value, and the aim of calibrating a differential pressure instrument is fulfilled, the differential pressure calibration method in a double-channel digital pressure instrument mode is mainly realized by a double-channel pressure controller, but the differential pressure calibration method in the double-channel digital pressure instrument mode can only be used for calibrating a low-static pressure differential pressure instrument, and the biggest problem is that the accuracy and the resolution of the differential pressure calibration are inevitably reduced while the digital pressure instrument meets high static pressure, in the technical scheme, a pressure gauge part provides the standard pressure value for the high-pressure end of a differential pressure transmitter, a pressure supply part provides reference pressure for the low-pressure end, a calibration part consists of two sets of mutually communicated calibration instruments, a bypass valve 20 is arranged between the two calibration instruments, and the two ends of the differential pressure transmitter can be connected or isolated by controlling the opening or closing of the bypass valve 20, the device has the function of generating a differential pressure value, thereby achieving the purposes of quickly, conveniently and accurately calibrating and calibrating the differential pressure transmitter and the differential pressure flowmeter.
The pressure gauge component is used for providing a standard pressure value for a high-pressure end of the differential pressure transmitter, and comprises a piston cylinder 11 and a piston body 12, wherein the piston body 12 is arranged on the piston cylinder 11, the pressure gauge component adopts a piston type pressure gauge and has high accuracy and good periodic stability, the piston body 12 is arranged on the piston cylinder 11, so that the piston body 12 can vertically move up and down, and optionally, the pressure gauge component also comprises a weight and a calibrator which consists of a pressure pump, a valve and a connecting pipe, of course, the pressure gauge component also can comprise a piston balance indicating device and a temperature measuring device, and the accuracy of the pressure gauge component can be improved; the pressure supply component is used for increasing pressure for the low-pressure end and providing system pressure, the pressure supply component comprises a control component 31, an air inlet pipe 32, an atmospheric pressure sensor 33, a standard pressure sensor 34, an air path control component 35 and an air outlet pipe 36, one end of the atmospheric pressure sensor 33 is connected to the control component 31, the other end of the atmospheric pressure sensor 33 is connected to the air inlet pipe 32, one end of the air path control component 35 is connected to the control component 31, the other end of the air path control component is connected to the air outlet pipe 36, the air outlet pipe 36 is connected to the low-pressure reference pipe 26 or the high-pressure reference pipe 28, the current atmospheric pressure value is introduced into the air inlet pipe 32 and then transmitted to the control component 31 through the atmospheric pressure sensor 33, the control component 31 adjusts the current atmospheric pressure value through adjusting the air path control component 35 and the standard pressure sensor 34, so that the air outlet pipe 36 outputs standard pressure, the air path control part 35 is used for generating a high-accuracy and high-corresponding-degree gas pressure signal, the checking part is used for generating pressure difference and comprises an air supply connecting pipe 21, an air exhaust connecting pipe 22, a first regulator 23, a second regulator 24, a low-pressure test pipe 25, a low-pressure reference pipe 26, a high-pressure test pipe 27, a high-pressure reference pipe 28 and a reference pressure gauge 29, one end of the air supply connecting pipe 21 is connected with the first regulator 23, one end of the high-pressure test pipe 27 is connected with the first regulator 23, the other end of the high-pressure test pipe 27 is connected with the pressure gauge part, the high-pressure test pipe 27 is communicated with the high-pressure reference pipe 28, the air exhaust connecting pipe 22 is connected with the first regulator 23, one end of the low-pressure test pipe 25 is connected with the second regulator 24, the other end of the low-pressure test pipe is connected with the pressure supply part, the reference pressure gauge 29, the high-pressure reference pipe 28 is communicated with the low-pressure reference pipe 26, the low-pressure test pipe 25 and the low-pressure reference pipe 26 are communicated with each other, the low-pressure test pipe 25 and the high-pressure test pipe 27 are communicated with each other, the verification part further comprises a bypass valve 20, the bypass valve 20 is arranged between the low-pressure test pipe 25 and the high-pressure test pipe 27, the low-pressure test pipe 25 is connected with an air outlet pipe 36, the high-pressure test pipe 27 is connected with a pressure gauge part, air enters from an air supply connecting pipe 21, the bypass valve 20 is opened at the moment, the verification part is filled with the air completely, then the bypass valve 20 is closed, the low-pressure test pipe 25 and the high-pressure test pipe 27 are opened, at the moment, the pressure in the low-pressure test pipe 25 is lower than the pressure in the high-pressure test pipe 27, then the pressure value in the high-pressure test pipe 27 is adjusted through a first adjuster 23, the pressure value in the low-pressure test pipe 25 is adjusted through a second adjuster 24, the differential pressure between the high-pressure test pipe 27 and the low-pressure test pipe 25 is stable, so that a differential pressure value is formed between the high-pressure test pipe 27 and the low-pressure test pipe 25, and the differential pressure reference pipe 26 and the high-pressure reference pipe 28 are respectively connected to achieve the technical effect of the quick-pressure transmitter; the first regulator 23 and the second regulator 24 have the same structure, and are mainly composed of a gas storage tank and a regulator, and the regulator can move towards or away from the gas storage tank, so that the gas in the gas storage tank is compressed, and the effect of regulating the pressure is achieved.
When using pressure supply components, there are generally two control types that can be selected. One is static control, which uses a pressure supply component to adjust the test system pressure to approach the corresponding test point until reaching the limit range of the target pressure, and reads the data when the transient effect caused by the rapid change of the pressure reaches the normal level and the pressure is stable enough. The other is a dynamic control or active control mode, in which the pressure supply unit adjusts the pressure in the test system to the desired pressure and continues to actively control the pressure around the target pressure value while recording the reference or measured value, which results in a stable pressure in a short time enabling faster calibration.
The uncertainty caused by the static control is only related to leakage conditions, transient effects and environmental changes of the pressure line. The static mode can eliminate the instability factor advantage caused by the control mode, however, in the dynamic control mode, the control stability is considered to be random, the standard deviation of the pressure average value is divided by the square root of the measurement times (n), in the static control mode, the pressure value changes towards one direction, the stability is not random, and therefore the standard deviation is divided by the standard deviation
The dynamic control mode has the advantages of small uncertainty, high control speed, stable pressure output and the like.
When a pressure gauge member with an accuracy level of 0.005 is used as a standard and the low-pressure side is exposed to the atmosphere, test data of the differential pressure transmitters of numbers 1, 2, 3, and 4 are analyzed and compared. Number 1: the differential pressure range (0-25) kPa, the output is a pressure value, and the static pressure range is (0-3) MPa; number 2: the differential pressure range (0-60.99) kPa, the output signal is 4-20 mA, and the static pressure range (0-6) MPa; number 3: the differential pressure range (0-160) kPa, the output signal is 4-20 mA, and the static pressure range (0-1.6) MPa; number 4: the differential pressure range (0-100) kPa, the output signal is 4-20 mA, and the static pressure range (0-1.6) MPa; table 1 shows measurement data of the differential pressure transmitter No. 1 in the atmospheric pressure mode.
Table 2 shows the test data of pressure transmitter No. 1 in high static pressure mode, the static pressure measurement points are 0.5, 1, 1.5, 2, 2.5, and 3 (in MPa), and the differential pressure measurement points are 0, 4, 8, 12, 16, 20, and 25 (in kPa), respectively.
For a more intuitive understanding, the following is represented in a functional graphical manner: a comparison diagram of differential pressure transmitters numbered 1, 2, 3, and 4 in two modes is shown in fig. 5, a is the differential pressure transmitter numbered 1, b is the differential pressure transmitter numbered 2, c is the differential pressure transmitter numbered 3, and d is the differential pressure transmitter numbered 4.
Through data analysis of two methods of four differential pressure transmitters with numbers 1, 2, 3 and 4, the influence of high static pressure on the differential pressure value is huge. According to the regulation of the verification regulation, for a 0.5-grade force balance type differential pressure transmitter, when the static pressure pw is less than 6.4MPa, the zero drift and the range change are not more than 2%, and in the same way, for the differential pressure transmitter used for trade settlement, the accuracy grade of the differential pressure sensor is 0.1 grade, and when the static pressure is less than 6.4MPa, the zero drift and the range change are not more than 0.8%. For the differential pressure transmitter of number 1, the zero drift was 0.3%, and the span change was 0.5%. For the differential pressure transmitter of number 2, the zero drift is 0.7%, and the span change is 1.1%. For the differential pressure transmitter of number 3, the zero drift was 0.1%, and the span change was 0.2%. For differential pressure transmitter No. 4, the zero drift was 0.5%, and the span change was 1.2%. The results show that the range changes of the differential pressure transmitters with numbers 2 and 4 can not meet the requirements of the verification regulations.
Experimental data shows that the grade of the high-static-pressure differential pressure transmitter can be improved by 0.2%, the technical scheme has the advantages that the height difference can be automatically edited, the mark with the piston reference surface is provided, the pressure generator automatically generates a pressure value, the working efficiency is greatly improved, and the labor intensity is reduced.
Further, the verifying part further includes a first balance valve 231 and a second balance valve 241, the first balance valve 231 is disposed inside the first regulator 23, and the second balance valve 241 is disposed inside the second regulator 24. In this embodiment, a balance valve is added, the first balance valve 231 is arranged inside the first regulator 23, the second balance valve 241 is arranged inside the second regulator 24, and when the balance valve is closed, the first regulator 23 and the second regulator 24 can be manually adjusted, so that the technical effect of convenient adjustment is achieved.
Further, the verification part further includes an intake valve 211 and an exhaust valve 221, the intake valve 211 is disposed between the air supply connection pipe 21 and the first regulator 23, and the exhaust valve 221 is disposed between the exhaust connection pipe 22 and the first regulator 23. In the embodiment, a verification part is further defined, the air inlet valve 211 is arranged between the air supply connecting pipe 21 and the first regulator 23, so that the air supply connecting pipe 21 can be opened or closed under the control of the air inlet valve 211, or the air flow in the air supply connecting pipe 21 is controlled, the air outlet valve 221 is arranged between the air outlet connecting pipe 22 and the first regulator 23, and the air outlet amount and the air outlet speed of the air outlet connecting pipe 22 can be controlled through the air outlet valve 221, so that the technical effect of adjusting the air pressure in the verification part is achieved.
Further, the verification part further comprises a filter 4, and the filter 4 is arranged on the air supply connection pipe 21, the low pressure reference pipe 26 and the high pressure reference pipe 28. In this embodiment, a verification component is further defined, a plurality of filters 4 are arranged on the verification component, the gas supply connection pipe 21 is used for inputting gas to the verification component, and therefore, the gas entering the verification component needs to be filtered, the filters 4 are arranged between the gas supply connection pipe 21 and the first regulator 23, so that the gas entering the first regulator 23 needs to be filtered by the filters 4 first, and thus cleanness of the gas in the verification component is ensured, similarly, the low-pressure reference pipe 26 and the high-pressure reference pipe 28 need to be connected with a differential pressure transmitter, and in order to ensure cleanness of the gas entering the verification component, the filters 4 are also arranged on the low-pressure reference pipe 26 and the high-pressure reference pipe 28, so that a technical effect of improving detection accuracy of the verification component is achieved.
Further, the pressure supply unit further includes a relay card 37, and the relay card 37 is disposed between the air passage control unit 35 and the control unit 31. In this embodiment, the relay card 37 is added, and the relay card 37 is used as a command transmission tool of the controller, and includes a plurality of isolated output channels, and can quickly respond to the switch control signal transmitted from the control component 31, and the switch action of the corresponding valve can be controlled only by writing control data into the port address, so as to control the valve in the gas path, thereby realizing the switching of the gas path of the device under different working states and the control of the output pressure of the device.
Further, the pressure supply component further comprises a data acquisition component 39, the data acquisition component 39 comprises a temperature sensor and a humidity sensor, and the temperature sensor and the humidity sensor are respectively connected to the control component 31. In this embodiment, the pressure supply component is further defined, the data acquisition component 39 comprises a temperature sensor and a humidity sensor, the temperature sensor and the humidity sensor are respectively connected to the control component 31, the temperature sensor and the humidity sensor can acquire the temperature and the humidity of the external environment, and the pressure supply component further comprises a display component 39, the display component 39 is connected to the control component 31 and is used for displaying the temperature data, the humidity data and other parameters, so that the technical effect of real-time display is achieved.
Further, the check unit further includes a return pipe provided between the low pressure reference pipe 26 and the second regulator 24, and a check valve 5 provided on the return pipe. In this embodiment, a return pipe is added, which is disposed between the low pressure reference pipe 26 and the second regulator 24 so that gas enters the second regulator 24 from the low pressure reference pipe 26 and then returns to the low pressure reference pipe 26 through the return pipe, and a check valve 5 is disposed on the return pipe to prevent gas from entering the second regulator 24 through the return pipe.
Further, the air path control component 35 includes an air volume chamber 351, a first main air tube 352, a second main air tube 353, a first air tube 354, a second air tube 355, a third air tube 356, a first flow valve 357, a second flow valve 358, a first pinhole valve 359, a second pinhole valve 350 and a plurality of solenoid valves 8, one end of the first main air tube 352 is connected to the relay card 37, the other end of the first main air tube is connected to the air volume chamber 351, one end of the second main air tube 353 is connected to the air volume chamber 351, the other end of the second main air tube is connected to the air tube 351, two ends of the first air tube 354 are connected to the first main air tube 352 and the second air tube 351, two ends of the second air tube 355 are connected to the second main air tube 353 and the second air tube 351, two ends of the third air tube 356 are connected to the second air tube 355 and the second air tube 351, the first flow valve 357 is disposed on the first main air tube 352, the second flow valve 358 is disposed on the second main air tube 355, the first air tube 353, the second air tube 352, the second air tube 354, the second air tube 355, the second air tube 356 and the second air tube 356 are disposed on the second air tube 355. In this embodiment, the gas path control unit 35 is further defined, the control unit 31 first determines the volume of the calibration system, then calculates the amount of gas to be charged in the calibration system when the pressure is reached according to a set pressure value, and then calculates the opening time of the electromagnetic valve 8 required for the gas flowing into the calibration system in a corresponding amount, the control unit 31 controls the first flow valve 357 and the electromagnetic valve 8 to open for pressurization, and when pressure reduction is required, opens the second flow control valve and the electromagnetic valve 8, in this embodiment, a mode of combining the flow valve and the electromagnetic valve 8 is adopted, so that pressurization and pressure reduction are both controlled by two-stage valves, thereby satisfying rapidity of system response, and satisfying precision and stability of control; optionally, the air path control unit 35 further includes a pressure sensor 6, and the pressure sensor 6 is connected to the air-accommodating chamber 351, and can monitor the pressure in the air-accommodating chamber 351 in real time, so as to achieve the technical effect of monitoring the pressure value.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A differential pressure transmitter verification system, comprising:
the pressure gauge component comprises a piston cylinder and a piston body, and the piston body is arranged on the piston cylinder;
the calibration component comprises an air supply connecting pipe, an air exhaust connecting pipe, a first regulator, a second regulator, a low-pressure test pipe, a low-pressure reference pipe, a high-pressure test pipe, a high-pressure reference pipe and a reference pressure gauge, wherein one end of the air supply connecting pipe is connected to the first regulator, one end of the high-pressure test pipe is connected to the first regulator, the other end of the high-pressure test pipe is connected to the pressure gauge component, the high-pressure test pipe and the high-pressure reference pipe are communicated with each other, the air exhaust connecting pipe is connected to the first regulator, one end of the low-pressure test pipe is connected to the second regulator, the other end of the low-pressure test pipe is connected to a pressure supply component, the reference pressure gauge, the high-pressure reference pipe and the low-pressure reference pipe are communicated with each other, the low-pressure test pipe and the high-pressure test pipe are communicated with each other, the calibration component further comprises a bypass valve, the bypass valve is arranged between the low-pressure test pipe and the high-pressure test pipe, the calibration component further comprises a return pipe and a return pipe, the return pipe is arranged between the low-pressure reference pipe and the second regulator, and the return valve is arranged on the return pipe;
a pressure supply component, which comprises a control component, an air inlet pipe, an atmospheric pressure sensor, a standard pressure sensor, an air path control component and an air outlet pipe, one end of the atmospheric pressure sensor is connected with the control component, the other end of the atmospheric pressure sensor is connected with the air inlet pipe, one end of the gas circuit control part is connected with the control part, the other end is connected with the gas outlet pipe, one end of the standard pressure sensor is connected with the control part, the other end is connected with the gas outlet pipe, the air outlet pipe is connected with the low-pressure reference pipe or the high-pressure reference pipe, the air path control part comprises an air volume cavity, a first main air pipe, a second main air pipe, a first air branch pipe, a second air branch pipe, a third air branch pipe, a first flow valve, a second flow valve, a first pinhole valve, a second pinhole valve and a plurality of electromagnetic valves, one end of the second main air pipe is connected with the air-volume chamber, the other end is connected with the air outlet pipe, two ends of the first gas distribution pipe are respectively connected with the first main gas pipe and the gas-containing cavity, two ends of the second gas distribution pipe are respectively connected with the second main gas pipe and the gas-containing cavity, two ends of the third gas distribution pipe are respectively connected with the second gas distribution pipe and the gas-containing cavity, the first flow valve is arranged on the first main gas pipe, the second flow valve is arranged on the second main air pipe, the first pinhole valve is arranged on the first air branch pipe, the second pinhole valve is arranged on the second air dividing pipe, the electromagnetic valves are arranged on the first main air pipe, the second main air pipe, the first air dividing pipe, the second air dividing pipe and the third air dividing pipe, the gas circuit control part also comprises a pressure sensor which is connected with the gas-containing cavity.
2. The differential pressure transmitter verification system of claim 1,
the verification component further includes a first counter balance valve disposed within the first regulator and a second counter balance valve disposed within the second regulator.
3. The differential pressure transmitter verification system of claim 2,
the verification part further comprises an air inlet valve and an air outlet valve, the air inlet valve is arranged between the air supply connecting pipe and the first regulator, and the air outlet valve is arranged between the air outlet connecting pipe and the first regulator.
4. The differential pressure transmitter verification system of claim 3,
the verification component further comprises a filter, and the filter is arranged on the air supply connecting pipe, the low-pressure reference pipe and the high-pressure reference pipe.
5. The differential pressure transmitter verification system of any one of claims 1 to 4,
the pressure supply component further comprises a relay card, the relay card is arranged between the air path control component and the control component, one end of the first main air pipe is connected with the relay card, and the other end of the first main air pipe is connected with the air-capacitor cavity.
6. The differential pressure transmitter verification system of claim 5,
the pressure supply component further comprises a data acquisition component, the data acquisition component comprises a temperature sensor and a humidity sensor, and the temperature sensor and the humidity sensor are respectively connected to the control component.
7. The differential pressure transmitter verification system of claim 5,
the pressure supply part further comprises a display part, and the display part is connected to the control part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110601681.7A CN113340527B (en) | 2021-05-31 | 2021-05-31 | Differential pressure transmitter verification system |
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| CN202110601681.7A CN113340527B (en) | 2021-05-31 | 2021-05-31 | Differential pressure transmitter verification system |
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| CN114001803B (en) * | 2021-09-09 | 2024-02-27 | 国家管网集团浙江省天然气管网有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4602657A (en) * | 1985-02-11 | 1986-07-29 | Anderson-Greenwood & Co. | Valve manifold for a differential pressure transmitter |
| JP2000065668A (en) * | 1998-08-24 | 2000-03-03 | Toshiba Corp | Automatic calibrating device for pressure and differential pressure transmitter |
| US6672130B2 (en) * | 2001-09-08 | 2004-01-06 | Dresser, Inc. | Pressure generator for portable instrument |
| CN100439891C (en) * | 2006-09-20 | 2008-12-03 | 李丹佳 | Detection method and dedicated equipment for pressure difference measuring device |
| CN103364138B (en) * | 2011-12-23 | 2015-03-11 | 合肥工业大学 | Method for performing pressure fluctuation calibration on differential pressure transducer |
| CN202614465U (en) * | 2012-06-19 | 2012-12-19 | 杭州石林自动化工程有限公司 | Full automatic pressure checking table of high hydrostatic pressure differential pressure transmitter |
| CN207301826U (en) * | 2017-09-21 | 2018-05-01 | 河北省计量监督检测研究院 | Industrial differential pressure control device detection device |
| CN208902338U (en) * | 2018-10-31 | 2019-05-24 | 天津宏瑞祥仪表科技股份有限公司 | A kind of high static pressure differential pressure transmitter detection device |
| CN209117661U (en) * | 2019-02-22 | 2019-07-16 | 上海立格仪表有限公司 | A kind of gas controlling device |
| CN111076863A (en) * | 2020-03-04 | 2020-04-28 | 东营职业学院 | Intelligent differential pressure transmitter calibration system |
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