CN108267197B - Liquid level transmitter calibration device and calibration method thereof - Google Patents
Liquid level transmitter calibration device and calibration method thereof Download PDFInfo
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- CN108267197B CN108267197B CN201810045730.1A CN201810045730A CN108267197B CN 108267197 B CN108267197 B CN 108267197B CN 201810045730 A CN201810045730 A CN 201810045730A CN 108267197 B CN108267197 B CN 108267197B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
Abstract
The invention provides a liquid level transmitter calibration device, which is used for calibrating a liquid level transmitter and comprises: the liquid level transmitter comprises a pressurizing structure, a liquid level sensor and a liquid level sensor, wherein the pressurizing structure is provided with a positive pressure side assembly, a three-way joint and a negative pressure side assembly, the positive pressure side assembly is communicated with the negative pressure side assembly through the three-way joint, and the pressurizing structure is connected with the liquid level transmitter to form a loop during verification; and the pressure relief structure is connected with the three-way joint and is respectively communicated with the positive pressure side assembly and the negative pressure side assembly. When the pressure is relieved, the two pipelines can be simultaneously relieved through the pressure relief structure; the unbalanced pressure condition of two pipelines of the liquid level transmitter is prevented, the output abnormity is avoided, and the working reliability of the liquid level transmitter is improved. The invention also provides a calibration method of the calibration device of the liquid level transmitter.
Description
Technical Field
The invention relates to the technical field of calibration equipment, in particular to a liquid level transmitter calibration device and a calibration method thereof for calibrating a reference liquid level transmitter in a pressure vessel of a nuclear power plant.
Background
At present, a pressure vessel is generally provided with 6 differential pressure transmitters to monitor liquid level indication of the pressure vessel under different working conditions, and the differential pressure transmitters are divided into A/B rows which are respectively a narrow-range transmitter, a wide-range transmitter and a reference liquid level transmitter. The reference liquid level transmitter does not directly measure the liquid level of the pressure container and is mainly used for correcting the narrow-range and wide-range transmitters. When the nuclear power generating unit is in a loss of coolant accident (LOCA) working condition, the temperature in the containment vessel rises, and the liquid injection density of the sampling pipeline can change, so that the accuracy of the wide-range and narrow-range transmitter on monitoring the water level of the pressure vessel is influenced. The reference liquid level transmitter mainly reflects the temperature change in the containment and corrects the wide-range and narrow-range transmitter, so that the liquid level of the pressure vessel can be accurately measured under the accident condition. 6 differential pressure transmitters in a pressure vessel of a nuclear power unit are defined as monitoring instruments under accidents, and the importance level is self-evident.
However, depending on the field application feedback, the reference level transmitter often experiences abnormal transmitter output due to unbalanced pressurization; meanwhile, the function of the equipment can be recovered only by a replacement maintenance mode, so that the equipment is expensive, the replacement process is complex and the construction period is long. Typically, a pressure vessel reference level transmitter primarily includes an upper isolator, a lower isolator, a transmitter body, and a capillary line. As shown in fig. 1, VA1 and VA2 are isolation valves; A. d is an exhaust valve; B. and C is a plug. If the pressure vessel reference liquid level transmitter is verified, the compressed air tank needs to be isolated, and meanwhile, the pressure in the pipeline is released to the atmospheric pressure through the plug B, C, in the process, if B, C is released successively, the condition that the reference liquid level transmitter is unbalanced and pressed easily occurs, and the reliability of the accident monitoring instrument is greatly influenced.
Disclosure of Invention
Therefore, the liquid level transmitter calibration device capable of achieving balanced pressurization of the liquid level transmitter to improve reliability is needed to solve the problem of unbalanced pressurization existing in the use and calibration of the current reference liquid level transmitter, and meanwhile, the calibration method using the liquid level transmitter calibration device is also provided.
The above purpose is realized by the following technical scheme:
a level transmitter calibration apparatus for calibrating a level transmitter, the level transmitter calibration apparatus comprising:
the liquid level transmitter comprises a pressurizing structure, a liquid level sensor and a liquid level sensor, wherein the pressurizing structure is provided with a positive pressure side assembly, a three-way joint and a negative pressure side assembly, the positive pressure side assembly is communicated with the negative pressure side assembly through the three-way joint, and the pressurizing structure is connected with the liquid level transmitter to form a loop during verification; and
and the pressure relief structure is connected to the three-way joint and is respectively communicated with the positive pressure side assembly and the negative pressure side assembly.
In one embodiment, the positive pressure side assembly comprises a positive pressure pipeline and a positive pressure valve, and the positive pressure valve is arranged on the positive pressure pipeline and used for controlling the on-off of the positive pressure pipeline;
the negative pressure side assembly comprises a negative pressure pipeline and a negative pressure valve, and the negative pressure valve is arranged on the negative pressure pipeline and used for controlling the on-off of the negative pressure pipeline;
the positive pressure pipeline and the negative pressure pipeline are respectively communicated with the three-way joint.
In one embodiment, the positive pressure pipeline is also provided with a positive pressure pressurizing port, and the positive pressure pressurizing port is positioned on one side of the positive pressure valve away from the negative pressure valve; the negative pressure pipeline is provided with a negative pressure pressurizing port, and the negative pressure pressurizing port is positioned on one side, away from the positive pressure valve, of the negative pressure valve.
In one embodiment, the pressure relief structure comprises a pressure relief pipeline, a pressure relief valve and a pressure relief flow limiting component, wherein the pressure relief valve is arranged on the pressure relief pipeline and used for controlling the on-off of the pressure relief pipeline; the pressure relief and flow limiting component is arranged in the pressure relief pipeline and used for limiting the pressure relief rate.
In one embodiment, the checking device of the liquid level transmitter further comprises a pressurizing structure and a four-way joint, the pressurizing structure is communicated with the three-way joint through the four-way joint and is respectively communicated with the positive pressure side assembly and the negative pressure side assembly, and the pressure relief structure is also connected to the four-way joint;
the pressurizing structure comprises a pressurizing pipeline, a pressurizing valve and a pressurizing current-limiting component, wherein the pressurizing valve is arranged on the pressurizing pipeline and used for controlling the on-off of the pressurizing pipeline; the charging flow limiting component is arranged in the charging pipeline and used for limiting the charging speed.
In one embodiment, the pressing structure further comprises two explosion-proof tubes and a connector arranged at the end of each explosion-proof tube, one ends of the two explosion-proof tubes are respectively connected with the positive pressure pipeline and the negative pressure pipeline, and the other ends of the two explosion-proof tubes are respectively connected with the liquid level transmitter through the connectors.
In one embodiment, the checking device of the liquid level transmitter further comprises a box body, the pressing structure, the pressure relief structure and the pressurizing structure are all arranged in the box body, and the two connectors of the pressing structure are exposed out of the box body.
In one embodiment, the liquid level transmitter calibration device further comprises an automatic wire winding structure arranged in the box body, a switch button is arranged on the box body, the switch button is pressed, and the automatic wire winding structure automatically recycles the explosion-proof pipe;
the automatic line winding structure comprises an elastic piece and a one-way locking piece which can rotate to wind the explosion-proof pipe, and the elastic piece is arranged on the one-way locking piece;
when the elastic piece stores energy, the one-way locking piece is locked, and the explosion-proof pipe stops acting;
and the elastic piece stores energy and releases, the one-way locking piece unlocks and winds and recovers the explosion-proof pipe.
In one embodiment, the box body is further provided with an operation panel, the operation panel is provided with a plurality of control buttons, and the control buttons are respectively used for controlling the action and the stop of the positive pressure side assembly, the negative pressure side assembly, the pressure relief structure and the pressure charging structure;
the side surface of the box body is also provided with a handle which is convenient to hold;
the corner of the box body is provided with a collision prevention part.
In one embodiment, the liquid level transmitter calibration device further comprises a pressure gauge and a temperature gauge;
the pressure gauge is connected to the four-way connector and used for measuring gas pressure and displaying the gas pressure through the operation panel;
the thermometer is arranged in the box body and used for measuring the ambient temperature and displaying the ambient temperature through the operation panel.
A calibration method of a calibration device of a liquid level transmitter is applied to the calibration device of the liquid level transmitter with any technical characteristics, and comprises the following steps:
connecting the liquid level transmitter with a liquid level transmitter calibration device; the positive pressure side assembly of the liquid level transmitter calibration device is connected to one outlet of the liquid level transmitter, and the negative pressure side assembly of the liquid level transmitter calibration device is connected to the other outlet of the liquid level transmitter;
switching on and off a valve of the liquid level transmitter to enable a lower side isolator of the liquid level transmitter to be communicated with an upper side isolator;
opening a pressure relief structure, wherein the pressure relief structure is communicated with the upper side isolator through the positive pressure side assembly, is communicated with the lower side isolator through the negative pressure side assembly, and relieves pressure of the lower side isolator and the upper side isolator;
closing the pressure relief structure, connecting a pressurizing device externally to the positive pressure side assembly, and pressurizing the lower side isolator, or connecting a pressurizing device externally to the negative pressure side assembly, and pressurizing the upper side isolator;
and after the verification is finished, restoring the liquid level transmitter and the liquid level transmitter verifying device to an initial state.
In one embodiment, the verification method further comprises the step of pressurizing the compressed air tank, the step of pressurizing the compressed air tank comprising the steps of:
connecting the liquid level transmitter with a liquid level transmitter calibration device;
switching on and off a valve of the liquid level transmitter to enable a lower side isolator of the liquid level transmitter to be communicated with an upper side isolator;
opening a stamping structure, wherein the pressurizing structure is communicated with the liquid level transmitter through the positive pressure side assembly and the negative pressure side assembly and pressurizes a compressed air tank;
and restoring the liquid level transmitter and the liquid level transmitter verifying device to an initial state.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the liquid level transmitter calibration device and the calibration method thereof, one end of a positive pressure side assembly of a pressurizing structure is connected with one outlet of a plug B, C, and one end of a negative pressure side assembly is connected with one outlet of a plug B, C, so that the pressurizing structure and the liquid level transmitter form a loop; the pressure relief assembly is connected between the positive pressure side assembly and the negative pressure side assembly; after the isolation valves VA1 and VA2 are opened, the exhaust valve A, D is opened, so that the liquid level transmitter and the liquid level transmitter calibration device form a loop, and therefore when pressure is relieved, the two pipelines can be relieved simultaneously through the pressure relief structure; the problem of unbalanced pressure during use and calibration of the current reference liquid level transmitter is effectively solved; the unbalanced pressure condition of two pipelines of the liquid level transmitter is prevented, so that abnormal output is avoided, and the working reliability of the liquid level transmitter is improved.
Drawings
FIG. 1 is a schematic diagram of a level transmitter verification device coupled to a level transmitter in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of the level transmitter verification device shown in FIG. 1;
FIG. 3 is a schematic view of the level transmitter verification device of FIG. 2 installed in a cassette;
FIG. 4 is a schematic view of a heavy automatic wire take-up structure of the level transmitter calibration device shown in FIG. 2;
fig. 5 is a schematic view of an operation panel on the box body shown in fig. 2.
Wherein:
100-level transmitter calibration equipment;
110-a pressing structure;
111-a positive pressure side assembly; 1111-positive pressure pipeline; 1112-positive pressure valves; 1113-pressing the opening by positive pressure;
112-negative pressure side assembly; 1121-negative pressure pipeline; 1122-a negative pressure valve; 1123-negative pressure pressing port;
113-a three-way joint;
114-a detonation tube;
115-a connector;
120-a pressure relief structure;
121-a pressure relief line;
122-a pressure relief valve;
123-a pressure relief flow limiting feature;
124-pressure relief plug;
130-a pressurizing structure;
131-a pressurizing pipeline;
132-a pressure charging valve;
133-a charge flow limiting component;
134-pressurizing plug;
140-a four-way joint;
150-pressure gauge;
160-a cartridge;
161-operating panel;
162-a handle;
163-bump prevention;
164-a switch button;
170-automatic wire take-up structure;
171-an elastic member;
172-one-way locking;
173-a rotating shaft;
200-a liquid level transmitter;
210-a transmitter body;
220-upper side isolator;
230-lower side isolator;
240-connecting lines;
250-compressed air tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the level transmitter calibration apparatus and the calibration method thereof of the present invention are further described in detail by embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, the present invention provides a calibration apparatus 100 for a liquid level transmitter, wherein the calibration apparatus 100 is used for calibrating a liquid level transmitter 200, and is mainly used for calibrating a reference liquid level transmitter in a pressure vessel of a nuclear power plant, so that the liquid level transmitter 200 is balanced and pressurized, an abnormal problem caused by unbalanced pressurization is avoided, the liquid level transmitter 200 is prevented from working abnormally, and the working reliability of the liquid level transmitter 200 is improved. Of course, the level transmitter verification device 100 of the present invention may also be used to verify level transmitters in other applications. The liquid level transmitter 200 comprises an upper isolator 220, a lower isolator 230, a transmitter body 210 and a capillary line, wherein each part in the liquid level transmitter 200 and the connection between the part and a compressed air tank 250 are connected through a connecting pipeline 240, specifically shown in fig. 1, wherein VA1 and VA2 are isolation valves; A. d is an exhaust valve; B. and C is a plug. To eliminate the static pressure error, a pressure of 0.25MPa (gauge pressure) is added to the reference differential pressure gauge, which is introduced by the compressed air tank 250, and the pressure is maintained by the compressed air. The upper side separator 220 and the lower side separator 230 are installed as close to the pressure taking point as possible, and function to reduce the risk of leakage of the reactor coolant and to keep the reference water column constant. The upper isolator 220, lower isolator 230, transmitter body 210 and connecting piping 240 therebetween are filled under vacuum.
Referring to fig. 1 and 2, in the present invention, a level transmitter verification device 100 includes a pressure structure 110 and a pressure relief structure 120. The hold-down structure 110 is used to place the upper isolator 220 and the lower isolator 230 of the level transmitter 200 in communication. During verification, the pressing structure 110 is connected with two outlets of the liquid level transmitter 200, namely, after the plug B, C is loosened, two ends of the pressing structure 110 are respectively communicated with two outlets of the installation plug B, C of the liquid level transmitter 200, and then the upper isolator 220 is communicated with the lower isolator 230. The pressure relief structure 120 is communicated with the pressing structure 110, and is used for relieving the pressure of the upper isolator 220 and the lower isolator 230; when the pressure is released, the pressure releasing structure 120 acts, and the upper isolator 220 and the lower isolator 230 can respectively convey the gas to the pressing structure 110, so as to release the pressure through the pressure releasing structure 120. Pressure release structure 120 can realize the pressure release in the time of upside isolator 220 and downside isolator 230, and the unusual problem of unbalanced pressurized appears in effectual liquid level transmitter 200 of avoiding, prevents that liquid level transmitter 200 from damaging because liquid level transmitter 200 that unbalanced pressurized leads to, improves the reliability of liquid level transmitter 200 work.
Specifically, the pressing structure 110 includes a positive pressure side assembly 111, a three-way joint 113, and a negative pressure side assembly 112, and the positive pressure side assembly 111 is communicated with the negative pressure side assembly 112 through the three-way joint 113. During verification, the positive pressure side assembly 111 is further connected to one outlet of the liquid level transmitter 200, and the negative pressure side assembly 112 is further connected to the other outlet of the liquid level transmitter 200, so that the pressing structure 110 and the liquid level transmitter 200 form a loop. The pressure relief structure 120 is connected to the three-way joint 113 and is respectively communicated with the positive pressure side assembly 111 and the negative pressure side assembly 112. One end of the positive pressure side component 111 is communicated with one interface of the three-way joint 113, and the other end of the positive pressure side component 111 is communicated with an outlet of a mounting plug B of the liquid level transmitter 200; one end of the negative pressure side assembly 112 is communicated with the other interface of the three-way joint 113, and the other end of the negative pressure side assembly 112 is communicated with the outlet of the installation plug C of the liquid level transmitter 200; the pressure relief structure 120 is in communication with yet another port of the three-way connection 113.
When the liquid level transmitter 200 is verified, the plug B, C is firstly loosened, and the positive pressure side component 111 and the negative pressure side component 112 of the pressing structure 110 of the liquid level transmitter verifying device 100 are respectively connected with the outlet of the installation plug B, C; then, the isolation valves VA1, VA2 are closed and the exhaust valve A, D is opened to allow the upper isolator 220 to communicate with the lower isolator 230. The action of the pressure relief structure 120 is controlled, the gas pressure in the connecting pipeline 240, the positive pressure side assembly 111 and the negative pressure side assembly 112 is relieved to the atmospheric pressure, and the pressure relief structure 120 simultaneously relieves the pressure of the upper side isolator 220 and the lower side isolator 230, so that the unbalanced pressure condition can be prevented, and the working reliability of the liquid level transmitter 200 is improved. After the verification is completed, the liquid level transmitter 200 and the liquid level transmitter verification apparatus 100 need to be restored to the initial states, that is, the isolation valves VA1 and VA2 are in the open state, and the pressure structure 110 and the pressure relief structure 120 are in the closed state. The isolation valves VA1, VA2 are opened and the compressed air tank 250 pressurizes the connecting line 240. Since the upper isolator 220 is pressurized simultaneously with the lower isolator 230, an unbalanced pressurization condition is prevented. And after the pressure is charged to the preset pressure, closing the exhaust valve A, D, removing the liquid level transmitter calibration device 100, fastening the plug B, C and completing the calibration operation.
According to the liquid level transmitter calibration device 100, the positive pressure side assembly 111 and the negative pressure side assembly 112 are arranged on two sides of the pressure relief structure 120, the positive pressure side assembly 111 and the negative pressure side assembly 112 are respectively connected with two outlets of the liquid level transmitter 200, so that the liquid level transmitter 200 and the liquid level transmitter calibration device 100 form a loop, and when pressure is relieved, two connecting pipelines 240 can be simultaneously relieved through the pressure relief structure 120; the problem of unbalanced pressure during use and calibration of the current reference liquid level transmitter is effectively solved; the unbalanced pressure condition of two pipelines of the liquid level transmitter 200 is prevented, so that the output abnormity is avoided, and the working reliability of the liquid level transmitter 200 is improved.
Further, the positive pressure side assembly 111 includes a positive pressure pipeline 1111 and a positive pressure valve 1112, and the positive pressure valve 1112 is disposed on the positive pressure pipeline 1111 and is used for controlling the on-off of the positive pressure pipeline 1111. The negative pressure side assembly 112 includes a negative pressure pipeline 1121 and a negative pressure valve 1122, and the negative pressure valve 1122 is disposed on the negative pressure pipeline 1121 and is used for controlling on/off of the negative pressure pipeline 1121. The positive pressure pipeline 1111 and the negative pressure pipeline 1121 are respectively communicated with a three-way joint 113. One end of the positive pressure pipeline 1111 is connected with one of the interfaces of the three-way joint 113, the negative pressure pipeline 1121 is connected with the other interface of the three-way joint 113, before pressure relief, the positive pressure valve 1112 and the negative pressure valve 1122 are opened to enable the positive pressure pipeline 1111 to be communicated with the negative pressure pipeline 1121, and further enable the upper isolator 220 and the lower isolator 230 of the liquid level transmitter 200 to be communicated, so that pressure relief can be simultaneously carried out through the pressure relief structure 120 during pressure relief, and unbalanced pressure is avoided; when the initial state is restored, the positive pressure valve 1112 and the negative pressure valve 1122 are closed, and then the compressed air tank 250 pressurizes the connecting line 240, the upper isolator 220, and the lower isolator 230 at the same time, thereby preventing unbalanced pressurization.
Still further, the positive pressure pipeline 1111 further has a positive pressure pressurizing port 1113, and the positive pressure pressurizing port 1113 is located on the side of the positive pressure valve 1112 away from the negative pressure valve 1122; the negative pressure pipeline 1121 has a negative pressure pumping port 1123, and the negative pressure pumping port 1123 is located on the side of the negative pressure valve 1122 away from the positive pressure valve 1112. When the liquid level transmitter 200 is checked, a pressurizing test needs to be carried out, and an operator selects a positive pressurizing side and a negative pressurizing side according to requirements. If the positive pressure side is selected for pressurization, the positive pressure valve 1112 is closed, the pressurizing device is connected to the positive pressure pressurizing port 1113, and the negative pressure side is communicated with the atmosphere through the pressure relief structure 120, at this time, the pressurizing operation can be performed on the upper isolator 220. If the negative pressure side pressurization is selected, the negative pressure valve 1122 is closed, the pressurization device is connected to the negative pressure pressurization port 1123, and the positive pressure side is communicated with the atmosphere through the pressure relief structure 120, so that the pressurization operation can be performed on the lower isolator 230. Optionally, the positive pressure pressurizing port 1113 and the negative pressure pressurizing port 1123 are provided with a blocking cap, which serves as a reserved port to play a role in sealing during normal operation, and can prevent foreign matters from entering to ensure the reliability of the operation of the checking device 100 for the liquid level transmitter. Illustratively, the positive pressure pressurizing port 1113 and the negative pressure pressurizing port 1123 are realized by three-way valves, the three-way valves are respectively disposed in the positive pressure pipeline 1111 and the negative pressure pipeline 1121, and the third ports of the three-way valves are respectively the positive pressure pressurizing port 1113 and the negative pressure pressurizing port 1123 while connecting the positive pressure pipeline 1111 and the negative pressure pipeline 1121.
Further, the pressure relief structure 120 includes a pressure relief pipeline 121 and a pressure relief valve 122. The pressure relief valve 122 is disposed on the pressure relief pipeline 121 and is configured to control on/off of the pressure relief pipeline 121. One end of the pressure relief pipeline 121 is communicated with the other interface of the three-way joint 113, during pressure relief, the pressure relief valve 122 is opened, gas in the upper side isolator 220, the lower side isolator 230 and the connecting pipeline 240 can be exhausted to the atmosphere, so that the upper side isolator 220 and the lower side isolator 230 are released to the atmospheric pressure, pressure balance of the upper side isolator 220 and the lower side isolator 230 at two ends of the liquid level transmitter 200 is ensured, and the problem of unbalanced pressure is avoided.
Optionally, the pressure relief structure 120 further includes a pressure relief flow limiting component 123, and the pressure relief flow limiting component 123 is disposed in the pressure relief pipeline 121 and is used for limiting a pressure relief rate. The pressure relief flow limiting member 123 can control the pressure relief rate of the high-pressure gas in the pipeline, and prevent the upper isolator 220 and the lower isolator 230 on both sides of the transmitter body 210 from being damaged due to the overhigh pressure relief rate. Illustratively, the pressure relief flow restriction 123 includes a flow restriction orifice through which the rate of pressure relief is controlled.
Optionally, a pressure relief plug 124 is installed at an end of the pressure relief pipeline 121, and is used for plugging the pressure relief pipeline 121 to prevent foreign matters from entering and blocking the pressure relief pipeline 121 or the orifice plate. Of course, in other embodiments of the present invention, a filter screen may be further disposed in the end portion of the pressure relief pipeline 121, so as to filter the foreign matter through the filter screen, and prevent the foreign matter from entering and blocking the pressure relief pipeline 121 or the flow-limiting orifice plate. It will be appreciated that the screen is a metal screen.
As an implementation manner, the calibration apparatus 100 further includes a pressurizing structure 130 and a four-way joint 140, the pressurizing structure 130 is communicated with the three-way joint 113 through the four-way joint 140 and is respectively communicated with the positive pressure side assembly 111 and the negative pressure side assembly 112, and the pressure relief structure 120 is also connected to the four-way joint 140. The pressurization structure 130 is used for pressurizing the compressed air tank 250 of the liquid level transmitter 200, so that the liquid level transmitter verification apparatus 100 can provide enough compressed air in the compressed air tank 250 for pressurizing the upper isolator 220, the lower isolator 230 and the connecting pipeline 240 in the verification process of the liquid level transmitter 200. The four-way joint 140 can function as a connection. One interface of the four-way joint 140 is communicated with the other interface of the three-way joint 113, the second interface of the four-way joint 140 is communicated with the pressure relief pipeline 121 of the pressure relief structure 120, and the third interface of the four-way joint is communicated with the pressurizing structure 130, so that the pressurizing structure 130 and the pressure relief structure 120 can be connected with the liquid level transmitter 200 through the pressurizing structure 110 respectively.
Further, the charging structure 130 includes a charging pipeline 131 and a charging valve 132. The charging valve 132 is disposed on the charging pipeline 131 and used for controlling the on/off of the charging pipeline 131. One end of the pressurizing pipeline 131 is connected to the third port of the four-way joint 140, and the pressurizing valve 132 is opened to pressurize the compressed air tank 250 during pressurizing. During a charging operation of the compressed air tank 250, the vent valve A, D is closed and the plug B, C is released, connecting the level transmitter verification device 100 thereto. The vent valve A, D is opened to communicate the pressures of the upper isolator 220 and the lower isolator 230, and the upper isolator and the lower isolator are pressurized simultaneously to prevent unbalanced pressurization. The compressed air tank 250 is connected to the charging connection of the level transmitter verification device 100 by the charging structure 130. The charge valve 132 is opened to charge the compressed air tank 250, when the pressure in the compressed air tank 250 reaches a predetermined pressure, for example, 25 bar. The vent valve A, D is closed, the level transmitter verification device 100 is removed, the plug B, C is reinstalled, and the pressurization operation is completed.
Optionally, the charging structure 130 further comprises a charging current limiting component 133, and the charging current limiting component 133 is disposed in the charging pipeline 131 for limiting the charging rate. The pressurizing and flow-limiting component 133 can control the pressurizing rate of the high-pressure gas in the pipeline, and prevent the upper isolator 220 and the lower isolator 230 on two sides of the transmitter body 210 from being damaged due to the overhigh pressurizing rate. Illustratively, the charge flow restriction component 133 includes a restrictive orifice through which the charge rate is controlled.
Optionally, a pressurizing plug 134 is installed at an end of the pressurizing pipeline 131, and is used for plugging the pressurizing pipeline 131 to prevent foreign matters from entering and blocking the pressurizing pipeline 131 or the orifice plate. Of course, in other embodiments of the present invention, a filter screen may be further disposed in the end portion of the pressurizing pipeline 131, so as to filter the foreign matters through the filter screen, and prevent the foreign matters from entering and blocking the pressurizing pipeline 131 or the flow-limiting orifice plate. It will be appreciated that the screen is a metal screen.
It is understood that the connection of the various components of the level transmitter verification device 100 of the present invention is accomplished via pipes, which are not described herein. Moreover, the pipeline is a steel pipe; in addition, the pressure relief pipeline 121, the pressure charging pipeline 131, the positive pressure pipeline 1111 and the negative pressure pipeline 1121 are all made of steel pipes.
As an implementation manner, the pressuring structure 110 further includes two explosion-proof pipes 114 and a connector 115 disposed at an end of the explosion-proof pipes 114, one end of each of the two explosion-proof pipes 114 is connected to the positive pressure pipeline 1111 and the negative pressure pipeline 1121, and the other end of each of the two explosion-proof pipes 114 is connected to the liquid level transmitter 200 through the connector 115. One end of one explosion-proof pipe 114 is communicated with the positive pressure pipeline 1111, the other end of the explosion-proof pipe is connected with the outlet of the installation plug B of the liquid level transmitter 200 through a connector 115, one end of the other explosion-proof pipe 114 is communicated with the negative pressure pipeline 1121, and the other end of the explosion-proof pipe is connected with the outlet of the installation plug C of the liquid level transmitter 200 through the connector 115. Since the pressure in the compressed air tank 250 is 25bar and the pressure is high, the connection part between the upper isolator 220 and the lower isolator 230 on both sides of the level transmitter 200 is connected by the explosion-proof tube 114, so that the occurrence of tube explosion abnormality is prevented, and the connection head 115 can be conveniently switched. Illustratively, the explosion-proof tube 114 is a high-pressure hose, and the connector 115 is a universal connector, which facilitates the conversion.
The middle of the explosion-proof pipe 114 is connected by steel pipe sections, namely, the explosion-proof pipe is a positive pressure pipeline 1111 and a negative pressure pipeline 1121, and the positive pressure pressurizing port 1113 on the positive pressure pipeline 1111 and the negative pressure pressurizing port 1123 on the negative pressure pipeline 1121 are used for pressurizing operation, so that the transmitter can be directly verified without disassembling the liquid level transmitter verification device 100, frequent disassembly and assembly are avoided, and the operation efficiency is improved.
Referring to fig. 1 to fig. 3, as an implementation manner, the calibration apparatus 100 further includes a box 160, the pressing structure 110, the pressure releasing structure 120 and the pressure filling structure 130 are disposed in the box 160, and the two connectors 115 of the pressing structure 110 are exposed out of the box 160. Box body 160 can play the effect of accomodating, and most spare parts of liquid level transmitter verifying attachment 100 all set up in box body 160, can make liquid level transmitter verifying attachment 100's integrated level high, small like this, have reduced liquid level transmitter verifying attachment 100's space, portable greatly. The exposure of the two connectors 115 of the hold-down structure 110 can facilitate the coupling of the level transmitter verification device 100 to the level transmitter 200. Moreover, in use, the connector 115 can be pulled to extend the anti-explosion tube 114, so as to facilitate connection with the level transmitter 200.
Further, the box 160 further has an operation panel 161, and the operation panel 161 has a plurality of control buttons, and the control buttons are respectively used for controlling the operation and the stop of the positive pressure side assembly 111, the negative pressure side assembly 112, the pressure relief structure 120, and the pressure charging structure 130. For convenience of operation, the operation panel 161 realizes a uniform layout of various interfaces, valves, and the like, and all operations can be realized on the operation panel 161. For example, the operation panel 161 is provided with a positive pressure valve control knob and a negative pressure valve control knob to open and close the positive pressure valve 1112 and the negative pressure valve 1122, respectively. The operation panel 161 is further provided with a control button for the relief valve 122 and the relief pipeline 121 of the relief structure 120, a control button for the charging pipeline 131 and the charging valve 132 of the charging structure 130, and the like. Thus, after the box body 160 integrates various parts of the level transmitter calibration device 100, the operation and monitoring of the level transmitter calibration device 100 can be facilitated through the operation panel 161, so that the calibration operation is easy to perform.
Optionally, the sides of the box 160 also have handles 162 for easy gripping. The handle 162 is a pull-up handle, which is convenient for the operator to carry. Still optionally, the corners of the box 160 have bump guards 163 to avoid damage.
Referring to FIGS. 2, 3 and 5, still further, the level transmitter verification device 100 also includes a pressure gauge 150. The pressure gauge 150 is connected to the four-way joint 140 for measuring the gas pressure and is displayed through the operation panel 161. The operation panel 161 is provided with a pressure gauge display screen, and the pressure gauge 150 can measure the pressure of the gas in the pipeline, so as to monitor the gas filling/discharging condition in the pipeline in real time. In addition, the pressure gauge 150 is a digital display pressure gauge with a battery, and the pressure value on the pressure gauge can be displayed through a pressure gauge display screen on the operation panel 161, so that the monitoring of an operator is facilitated. During pressure relief and pressurization, the pressure of the compressed air tank 250 is monitored through a pressure gauge display screen on the operation panel 161, so that reliable work is ensured.
Moreover, the level transmitter calibration apparatus 100 further includes a thermometer disposed in the box body 160 for measuring an ambient temperature and displayed through the operation panel 161. The thermometer is used for monitoring and displaying the ambient temperature in real time. When the environmental temperature changes, the real pressure required by the liquid level transmitter 200 for verification can be quickly calculated, and the accuracy of verification is ensured. The operation panel 161 is provided with a thermometer display screen, and the temperature value on the thermometer can be displayed through the thermometer display screen, so that the operation of operators is facilitated. Optionally, the thermometer is a digital display with a battery as the thermometer.
Referring to fig. 1 to 4, as an implementation manner, the level transmitter calibration apparatus 100 further includes an automatic wire retrieving structure 170 disposed in the box body 160, the box body 160 has a switch button 164, and the automatic wire retrieving structure 170 automatically retrieves the explosion-proof tube 114 when the switch button 164 is pressed. Therefore, the explosion-proof tube 114 can be automatically recovered, the occupied space is reduced, and the carrying is convenient.
Further, the automatic wire rewinding structure 170 includes an elastic member 171 and a one-way locking member 172 capable of rotating to rewind the house explosion-proof pipe 114, wherein the elastic member 171 is disposed on the one-way locking member 172. When the elastic member 171 stores energy, the one-way locking member 172 is locked, and the explosion-proof tube 114 stops operating; the stored energy of the elastic member 171 is released, the one-way locking member 172 is unlocked, and the recovery explosion proof tube 114 is wound. The automatic wire rewinding structure 170 further includes a rotating shaft 173, and the one-way locking member 172 is rotatably installed through the rotating shaft 173. When the automatic wire rewinding structure 170 is in use, the explosion-proof tube 114 is unwound and unwound by the energy storage and release control one-way locking element 172 of the elastic element 171. When the explosion-proof tube 114 is pulled out, the elastic member 171 stores energy, and when the pulling-out is stopped, the rotating shaft 173 rotates under the action of the elastic member 171 to be locked by the one-way locking member 172, so that the explosion-proof tube 114 stops operating; when the explosion-proof tube 114 is retracted, the button on the box 160 releases the stored energy of the elastic element 171, and drives the rotating shaft 173 to wind and retract the explosion-proof tube 114. The automatic wire-rewinding structure 170 mainly realizes taking and storing of the explosion-proof pipe 114, and avoids dragging. Illustratively, the elastic member 171 is a spring, and the one-way locking member 172 is a ratchet structure; of course, the one-way locking member 172 may also be a one-way bearing in other embodiments of the invention.
The liquid level transmitter calibration device 100 integrates the pressurizing structure 110, the pressure relief structure 120 and the pressurizing structure 130, realizes integration of multiple functions such as pressure relief, pressurization and the like, is simple and convenient to operate, realizes connection of the pressurizing structure 110 and the liquid level transmitter 200 through the explosion-proof tube 114 and the connector 115, can effectively avoid frequent disassembly and assembly of the connector 115 and the like, and is convenient to use. Moreover, the stress balance between the upper side isolator 220 and the lower side isolator 230 on two sides of the liquid level transmitter 200 is realized through the pressure relief structure 120 and the pressure filling structure 130, the problem of uneven stress is avoided, the liquid level transmitter 200 is prevented from being damaged due to unbalanced pressure of the liquid level transmitter 200, and the working reliability of the liquid level transmitter 200 is improved.
Referring to fig. 1 and 2, the present invention further provides a calibration method of a calibration apparatus 100 for a liquid level transmitter, which is applied to the calibration apparatus 100 of any one of the above embodiments, and the calibration method includes the following steps:
the liquid level transmitter 200 is connected with the liquid level transmitter calibration device 100, the positive pressure side component 111 of the liquid level transmitter calibration device 100 is connected with one outlet of the liquid level transmitter 200, and the negative pressure side component 112 of the liquid level transmitter calibration device 100 is connected with the other outlet of the liquid level transmitter 200;
switching on and off a valve of the level transmitter 200 to communicate the lower isolator 230 of the level transmitter 200 with the upper isolator 220;
opening the pressure relief structure 120, wherein the pressure relief structure 120 is communicated with the upper isolator 220 through the positive pressure side assembly 111, the pressure relief structure 120 is communicated with the lower isolator 230 through the negative pressure side assembly 112, and the pressure relief structure is used for relieving the lower isolator 230 and the upper isolator 220;
closing the pressure relief structure 120, connecting a pressurizing device to the positive pressure side component 111, and pressurizing the lower isolator 230, or connecting a pressurizing device to the negative pressure side component 112, and pressurizing the upper isolator 220;
after the verification is completed, the level transmitter 200 and the level transmitter verification device 100 are restored to the initial state.
When the liquid level transmitter 200 is verified, the plug B, C is firstly loosened, and the explosion-proof tube 114 of the pressing structure 110 of the liquid level transmitter verifying device 100 is respectively connected with the outlet of the mounting plug B, C through the connecting head 115; then, the isolation valves VA1, VA2 are closed and the exhaust valve A, D is opened to allow the upper isolator 220 to communicate with the lower isolator 230. Open the relief valve 122 of pressure relief structure 120 on operating panel 161, beat the external environment with the gas among connecting tube 240, malleation side subassembly 111 and the negative pressure side subassembly 112 for the pressure of upside isolator 220 and downside isolator 230 leaks to atmospheric pressure, because pressure relief structure 120 is simultaneously to upside isolator 220 and downside isolator 230 pressure release, can prevent that the unbalanced pressurized condition from appearing, improves the reliability of liquid level transmitter 200 work.
Then, the positive and negative pressure sides are selected as required, and if the positive pressure side is selected, the positive pressure valve 1112 on the operation panel 161 is closed, the pressure device is connected to the positive pressure opening 1113, and the negative pressure side is communicated with the atmosphere through the pressure relief structure 120, and at this time, the pressure operation can be performed on the upper isolator 220. When the negative pressure side pressurizing is selected, the negative pressure valve 1122 on the operation panel 161 is closed, and the pressurizing device is connected to the negative pressure pressurizing port 1123, and the positive pressure side is communicated with the atmosphere through the pressure relief structure 120, so that the lower isolator 230 can be pressurized.
After the verification is completed, the liquid level transmitter 200 and the liquid level transmitter verification apparatus 100 need to be restored to the initial states, that is, the isolation valves VA1 and VA2 are in the open state, and the pressure structure 110 and the pressure relief structure 120 are in the closed state. The isolation valves VA1, VA2 are opened and the compressed air tank 250 pressurizes the connecting line 240. Since the upper isolator 220 is pressurized simultaneously with the lower isolator 230, an unbalanced pressurization condition is prevented. When the pressure value displayed by the pressure gauge display screen on the operation panel 161 is consistent with the pressure value of the compressed air tank 250, the exhaust valve A, D is closed, the liquid level transmitter calibration device 100 is detached, the plug B, C is fastened, and the calibration operation is completed.
Further, the verification method further includes the step of pressurizing the compressed air tank 250, and the step of pressurizing the compressed air tank 250 includes the steps of:
connecting the liquid level transmitter 200 with the liquid level transmitter calibration device 100;
switching on and off a valve of the level transmitter 200 to communicate the lower isolator 230 of the level transmitter 200 with the upper isolator 220;
opening the pressurizing structure 130, wherein the pressurizing structure 130 is communicated with the liquid level transmitter 200 through the positive pressure side assembly 111 and the negative pressure side assembly 112, and pressurizes the compressed air tank 250;
restoring the level transmitter 200 and the level transmitter calibration device 100 to the initial state.
When the compressed air tank 250 is pressurized, the exhaust valve A, D is closed firstly, the plug B, C is loosened, and the explosion-proof pipe 114 of the pressurizing structure 110 of the liquid level transmitter verifying device 100 is respectively connected with the outlet of the installation plug B, C through the connecting head 115; then, vent valve A, D is opened to allow communication between upper isolator 220 and lower isolator 230, preventing an unbalanced pressurized condition from occurring due to simultaneous pressurization of upper isolator 220 and lower isolator 230. Then, the compressed air tank 250 is connected to the charging connector of the level transmitter calibration apparatus 100 through the charging structure 130, and the charging valve 132 of the charging structure 130 on the operation panel 161 is opened to charge the level transmitter 200 and the compressed air tank 250. The charging condition can be observed in real time through a pressure gauge display screen on the operation panel 161, and the pressure of the compressed air tank 250 is monitored until the reading reaches 25 bar; and closing the exhaust valve A, D, removing the liquid level transmitter verifying device 100, fastening the plug B, C and completing the pressurizing operation.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A level transmitter calibration apparatus for calibrating a level transmitter, the level transmitter calibration apparatus comprising:
the liquid level transmitter comprises a pressurizing structure, a liquid level sensor and a liquid level sensor, wherein the pressurizing structure is provided with a positive pressure side assembly, a three-way joint and a negative pressure side assembly, the positive pressure side assembly is communicated with the negative pressure side assembly through the three-way joint, and the pressurizing structure is connected with the liquid level transmitter to form a loop during verification;
the pressure relief structure is connected to the three-way joint and is respectively communicated with the positive pressure side assembly and the negative pressure side assembly;
a four-way joint; and
the pressurizing structure is communicated with the three-way joint through the four-way joint and is respectively communicated with the positive pressure side assembly and the negative pressure side assembly, and the pressure releasing structure is also connected to the four-way joint.
2. The checking device of the liquid level transmitter according to claim 1, wherein the positive pressure side assembly comprises a positive pressure pipeline and a positive pressure valve, and the positive pressure valve is arranged on the positive pressure pipeline and used for controlling the on-off of the positive pressure pipeline;
the negative pressure side assembly comprises a negative pressure pipeline and a negative pressure valve, and the negative pressure valve is arranged on the negative pressure pipeline and used for controlling the on-off of the negative pressure pipeline;
the positive pressure pipeline and the negative pressure pipeline are respectively communicated with the three-way joint.
3. The level transmitter verification device of claim 2, wherein the positive pressure pipeline further has a positive pressure vent located on a side of the positive pressure valve away from the negative pressure valve; the negative pressure pipeline is provided with a negative pressure pressurizing port, and the negative pressure pressurizing port is positioned on one side, away from the positive pressure valve, of the negative pressure valve.
4. The checking device for the liquid level transmitter according to claim 2 or 3, wherein the pressure relief structure comprises a pressure relief pipeline, a pressure relief valve and a pressure relief current limiting component, wherein the pressure relief valve is arranged on the pressure relief pipeline and used for controlling the on-off of the pressure relief pipeline; the pressure relief and flow limiting component is arranged in the pressure relief pipeline and used for limiting the pressure relief rate.
5. The checking device of the liquid level transmitter according to claim 4, wherein the pressurizing structure comprises a pressurizing pipeline, a pressurizing valve and a pressurizing current limiting component, and the pressurizing valve is arranged on the pressurizing pipeline and used for controlling the on-off of the pressurizing pipeline; the charging flow limiting component is arranged in the charging pipeline and used for limiting the charging speed.
6. The checking device of the liquid level transmitter as claimed in claim 5, wherein the pressing structure further comprises two explosion-proof tubes and a connector disposed at the end of the explosion-proof tube, one end of each of the two explosion-proof tubes is connected to the positive pressure pipeline and the negative pressure pipeline respectively, and the other end of each of the two explosion-proof tubes is connected to the liquid level transmitter through the connector respectively.
7. The checking device of the liquid level transmitter as claimed in claim 6, further comprising a box, wherein the pressing structure, the pressure releasing structure and the pressure charging structure are disposed in the box, and two of the connectors of the pressing structure are exposed out of the box.
8. The checking device of the liquid level transmitter as claimed in claim 7, further comprising an automatic wire take-up structure disposed in the box body, wherein the box body is provided with a switch button, and the automatic wire take-up structure automatically recovers the explosion-proof pipe when the switch button is pressed;
the automatic line winding structure comprises an elastic piece and a one-way locking piece which can rotate to wind the explosion-proof pipe, and the elastic piece is arranged on the one-way locking piece;
when the elastic piece stores energy, the one-way locking piece is locked, and the explosion-proof pipe stops acting;
and the elastic piece stores energy and releases, the one-way locking piece unlocks and winds and recovers the explosion-proof pipe.
9. The checking device of the liquid level transmitter as claimed in claim 7, wherein the box body is further provided with an operation panel, the operation panel is provided with a plurality of control buttons, and the control buttons are respectively used for controlling the action and the stop of the positive pressure side assembly, the negative pressure side assembly, the pressure relief structure and the pressure charging structure;
the side surface of the box body is also provided with a handle which is convenient to hold;
the corner of the box body is provided with a collision prevention part.
10. The fluid level transmitter verification device of claim 9, further comprising a pressure gauge and a temperature gauge;
the pressure gauge is connected to the four-way connector and used for measuring gas pressure and displaying the gas pressure through the operation panel;
the thermometer is arranged in the box body and used for measuring the ambient temperature and displaying the ambient temperature through the operation panel.
11. A method of verifying a level transmitter verifier, when applied to a level transmitter verifier according to any one of claims 1 to 10, the method comprising the steps of:
connecting the liquid level transmitter with a liquid level transmitter calibration device; the positive pressure side assembly of the liquid level transmitter calibration device is connected to one outlet of the liquid level transmitter, and the negative pressure side assembly of the liquid level transmitter calibration device is connected to the other outlet of the liquid level transmitter;
switching on and off a valve of the liquid level transmitter to enable a lower side isolator of the liquid level transmitter to be communicated with an upper side isolator;
opening a pressure relief structure, wherein the pressure relief structure is communicated with the upper side isolator through the positive pressure side assembly, is communicated with the lower side isolator through the negative pressure side assembly, and relieves pressure of the lower side isolator and the upper side isolator;
closing the pressure relief structure, connecting a pressurizing device externally to the positive pressure side assembly, and pressurizing the lower side isolator, or connecting a pressurizing device externally to the negative pressure side assembly, and pressurizing the upper side isolator;
and after the verification is finished, restoring the liquid level transmitter and the liquid level transmitter verifying device to an initial state.
12. The verification method of claim 11, further comprising the step of pressurizing a compressed air tank, the step of pressurizing a compressed air tank comprising the steps of:
connecting the liquid level transmitter with a liquid level transmitter calibration device;
switching on and off a valve of the liquid level transmitter to enable a lower side isolator of the liquid level transmitter to be communicated with an upper side isolator;
opening a stamping structure, wherein the pressurizing structure is communicated with the liquid level transmitter through the positive pressure side assembly and the negative pressure side assembly and pressurizes a compressed air tank;
and restoring the liquid level transmitter and the liquid level transmitter verifying device to an initial state.
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| CN109932027A (en) * | 2019-04-03 | 2019-06-25 | 中广核核电运营有限公司 | The static pressure test apparatus and static pressure test method of fluid level transmitter |
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| CN105775754A (en) * | 2016-04-27 | 2016-07-20 | 北京首钢国际工程技术有限公司 | Injection tank pressure relief device for positive pressure pneumatic conveying |
| CN107305175A (en) * | 2016-04-25 | 2017-10-31 | 株洲中车时代电气股份有限公司 | The automation test of gas pressure device of pipe container |
| CN206609562U (en) * | 2017-03-30 | 2017-11-03 | 中广核核电运营有限公司 | A kind of used in nuclear power station differential pressure and pressure transmitter reliability detecting device |
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| US8020558B2 (en) * | 2007-01-26 | 2011-09-20 | Cs Medical, Inc. | System for providing flow-targeted ventilation synchronized to a patient's breathing cycle |
| CA2859814A1 (en) * | 2011-12-19 | 2013-06-27 | ResQSystems, Inc. | Systems and methods for therapeutic intrathoracic pressure regulation |
| US9494335B1 (en) * | 2013-05-09 | 2016-11-15 | Pathian Incorporated | Building pressure control |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107305175A (en) * | 2016-04-25 | 2017-10-31 | 株洲中车时代电气股份有限公司 | The automation test of gas pressure device of pipe container |
| CN105775754A (en) * | 2016-04-27 | 2016-07-20 | 北京首钢国际工程技术有限公司 | Injection tank pressure relief device for positive pressure pneumatic conveying |
| CN206609562U (en) * | 2017-03-30 | 2017-11-03 | 中广核核电运营有限公司 | A kind of used in nuclear power station differential pressure and pressure transmitter reliability detecting device |
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