A rapid calibration device and method for a capillary pressure transmitter

Abstract

The present invention belongs to the field of instrument measurement, and particularly relates to a rapid calibration device and method for a capillary pressure transmitter. The calibration device includes a capillary pressure transmitter, a capillary pressure transmitter diaphragm box, a capillary pressure transmitter and its flange fixing device, a capillary of the capillary pressure transmitter, a flange of the capillary pressure transmitter, a calibration connection flange, a connection cable, a calibration bench, and a calibration bench pressure guiding pipe. The present invention can complete the calibration work of the capillary pressure transmitter quickly, accurately, and safely, improve work efficiency, and ensure the safe and stable operation of the process system.

Description

Technical Field

[0001] The present invention belongs to the field of instrument measurement, and particularly relates to a rapid calibration device and method for a capillary pressure transmitter. Background Art

[0002] A pressure transmitter is one of the most commonly used sensors in industry. It is a device that converts pressure into a pneumatic signal or an electrical signal for control and remote transmission. It can convert physical pressure parameters of gases, liquids, etc. sensed by a measuring element sensor into a standard electrical signal (such as 4 - 20 mADC, etc.) to supply secondary instruments such as indicating alarm instruments, recorders, and regulators for measurement, indication, or process adjustment. It is widely used in various industrial control environments. It can not only measure the pressure of various media in pipelines, containers, etc., but also measure the differential pressure before and after the pump body pipeline, the flow rate of pipeline media, the liquid level of the media, and so on. The capillary pressure transmitter is suitable for pressure or differential pressure measurement occasions of media such as high temperature, strong corrosion, high viscosity, easy crystallization liquid level or gas, etc. The remote capillary pressure transmitter is divided into two types, one is a single flange, and the other is a double flange, which are respectively used for measuring pressure and differential pressure. It consists of a pressure transmitter head, a flange, a diaphragm box, a capillary, and a filling liquid in the capillary, etc. The process medium pressure is transmitted to the sensitive element of the pressure transmitter, that is, the sensor, through the diaphragm and the filling liquid, and then the pressure parameter is converted into an electrical signal to complete the measurement of the physical parameters of the process system.

[0003] Taking a certain nuclear power plant as an example, the capillary pressure transmitter is widely used for measuring the pressure, liquid level, etc. of media such as strong corrosive liquids or strongly volatile liquids, viscous liquids, and easily crystallized media in the process systems of the three wastes (waste water, waste gas, waste residue) in the control area plant, such as strong acids, strong alkalis, ammonia water, hydrazine, etc. However, the connection device of the pressure calibration bench commonly used on site at this nuclear power plant cannot be connected to the capillary connection flange of the capillary pressure transmitter, and no suitable calibration connection device can be found on the market. Moreover, during calibration, it is necessary to ensure that the centers of the diaphragm boxes of the capillary pressure transmitter and the flange diaphragm box are at the same height to ensure the accuracy of the calibration zero point. Therefore, the calibration of the capillary pressure transmitter is very difficult.

[0004] When the indication of the capillary pressure transmitter shows abnormality, maintenance personnel generally can only judge whether the instrument is working properly through other physical parameter values of the process system or experience, or maintenance personnel often use a new capillary pressure transmitter for replacement to verify whether the capillary pressure transmitter is working properly. The inability to calibrate the capillary pressure transmitter poses a hidden danger to the safe and stable operation of the process system. At the same time, because the capillary pressure transmitter is mainly used in high - risk places such as high radioactivity, strong acids, and strong alkalis, in order to avoid maintenance personnel from being irradiated by radioactivity or suffering from corrosion damage, maintenance personnel should not work in this place for a long time.

[0005] Therefore, it is urgent to develop a rapid calibration device for capillary pressure transmitters to calibrate capillary pressure transmitters and ensure the reliability and accuracy of capillary pressure transmitters. Summary of the Invention

[0006] The purpose of the present invention is to provide a rapid calibration device and method for capillary pressure transmitters, which can complete the calibration work of capillary pressure transmitters quickly, accurately and safely, improve work efficiency, and ensure the safe and stable operation of the process system.

[0007] Technical solutions for achieving the purpose of the present invention:

[0008] A rapid calibration device for a capillary pressure transmitter, the device includes: a capillary pressure transmitter, a capillary pressure transmitter diaphragm box, a capillary pressure transmitter and its flange fixing device, a capillary of the capillary pressure transmitter, a flange of the capillary pressure transmitter, a calibration connection flange, a connection cable, a calibration table and a calibration table pressure guiding pipe;

[0009] The capillary pressure transmitter and the flange of the capillary pressure transmitter are respectively installed on both sides of the top surface of the capillary pressure transmitter and its flange fixing device. The capillary pressure transmitter diaphragm box is installed inside the capillary pressure transmitter and is electrically connected to the capillary pressure transmitter. The capillary of the capillary pressure transmitter is placed on the top surface of the capillary pressure transmitter and its flange fixing device, and the capillary of the capillary pressure transmitter is hermetically connected to the capillary pressure transmitter diaphragm box and the flange of the capillary pressure transmitter respectively; the centers of the capillary pressure transmitter diaphragm box, the flange of the capillary pressure transmitter and the capillary of the capillary pressure transmitter are coaxially arranged;

[0010] The calibration table is installed on one side of the capillary pressure transmitter and its flange fixing device close to the flange of the capillary pressure transmitter; the calibration connection flange is installed on the top surface of the capillary pressure transmitter and its flange fixing device, on the side of the flange of the capillary pressure transmitter away from the capillary pressure transmitter, and the calibration connection flange is hermetically connected to the flange of the capillary pressure transmitter; the calibration table pressure guiding pipe is hermetically connected to the calibration table and the calibration connection flange respectively;

[0011] The capillary pressure transmitter is electrically connected to the calibration table through a connection cable.

[0012] Further, the calibration connection flange and the flange of the capillary pressure transmitter are hermetically connected through flange fixing bolts.

[0013] Further, the device further includes a capillary fixing rod, and the capillary fixing rod is fixedly installed on the top surface of the capillary pressure transmitter and its flange fixing device, between the capillary pressure transmitter and the flange of the capillary pressure transmitter.

[0014] Further, the device further includes a calibration table display screen, which is arranged on the calibration table and electrically connected to the calibration table.

[0015] Further, the device further includes a storage battery, which is arranged inside the calibration table and electrically connected to the capillary pressure transmitter and the calibration table respectively.

[0016] Further, the device further includes a calibration table switch, which is arranged on the calibration table and electrically connected to the calibration table.

[0017] Further, the capillary pressure transmitter and its flange fixing device are made of plastic material.

[0018] A rapid calibration method for a capillary pressure transmitter, the method comprising the following steps:

[0019] Step (1), electrically connect the capillary pressure transmitter to the calibration table;

[0020] Step (2), supply power to the calibration table and the capillary pressure transmitter;

[0021] Step (3), transmit the pressure initiated by the calibration table to the sealed pressure chamber;

[0022] Step (4), the diaphragm box of the capillary pressure transmitter transmits the pressure change to the capillary pressure transmitter;

[0023] Step (5), the capillary pressure transmitter converts the pressure change into a current value;

[0024] Step (6), compare the theoretical current value with the converted current value to judge the accuracy of the capillary pressure transmitter.

[0025] Further, the sealed pressure chamber in step (3) is composed of a calibration table, a calibration table pressure guiding pipe, a calibration connection flange, a capillary pressure transmitter flange, a capillary of the capillary pressure transmitter, and a diaphragm box of the capillary pressure transmitter.

[0026] The beneficial technical effects of the present invention are as follows:

[0027] 1. The rapid calibration device for a capillary pressure transmitter provided by the present invention can set the number of the capillary pressure transmitter and its flange fixing devices according to the number of flanges of the capillary pressure transmitter; the length, width, and height of the capillary pressure transmitter and its flange fixing devices can be designed according to the external dimension of the capillary pressure transmitter, and it has strong practicability;

[0028] 2. In a rapid calibration device for a capillary pressure transmitter provided by the present invention, a capillary fixing rod is provided on the capillary pressure transmitter and its flange fixing device. The capillary of the relatively long capillary pressure transmitter can be horizontally placed on the capillary pressure transmitter and its flange fixing device, which can reduce the length of the capillary pressure transmitter and its flange fixing device and has strong usability.

[0029] 3. In a rapid calibration device for a capillary pressure transmitter provided by the present invention, instead of using the commonly used dry battery power supply for the calibration bench, a 24V storage battery is integrated with the calibration bench. The storage capacity of the 24V storage battery can be configured according to actual needs. The 24V storage battery can be repeatedly charged and discharged, and the 24V storage battery can be disassembled and replaced, which has strong usability and avoids waste caused by using dry batteries.

[0030] 4. In a rapid calibration device for a capillary pressure transmitter provided by the present invention, the center of the diaphragm box of the capillary pressure transmitter, the capillary of the capillary pressure transmitter, and the center of the flange of the capillary pressure transmitter are on the same horizontal line, effectively ensuring the accuracy of the calibration zero point and the strong accuracy of the calibration work of the capillary pressure transmitter.

[0031] 5. In a rapid calibration device for a capillary pressure transmitter provided by the present invention, the capillary pressure transmitter and its flange fixing device are made of transparent plastic, which is light in weight and convenient for maintenance staff to carry into the workshop, and has strong portability.

[0032] 6. In a rapid calibration device for a capillary pressure transmitter provided by the present invention, the calibration joints are respectively welded to the pressure guiding pipe of the calibration bench and the calibration connecting flange; the outer dimension, the size of the opening, the material, etc. of the calibration connecting flange are the same as those of the flange of the capillary pressure transmitter, and the calibration connecting flange can be quickly and directly fixed to the flange of the capillary pressure transmitter, improving the work efficiency.

[0033] 7. In a rapid calibration device for a capillary pressure transmitter provided by the present invention, a sealed pressure chamber is formed among the calibration bench, the pressure guiding pipe of the calibration bench, the calibration joints, the calibration connecting flange, the flange of the capillary pressure transmitter, the capillary of the capillary pressure transmitter, and the diaphragm box of the capillary pressure transmitter, and the calibration work of the capillary pressure transmitter has strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. is a schematic structural diagram of a rapid calibration device for a capillary pressure transmitter provided by the present invention.

[0035] In the figure: 1 - capillary pressure transmitter; 2 - diaphragm box of capillary pressure transmitter; 4 - capillary pressure transmitter and its flange fixing device; 5 - capillary fixing rod; 6 - capillary of capillary pressure transmitter; 7 - flange of capillary pressure transmitter; 8 - flange hole of capillary pressure transmitter; 9 - flange fixing bolt; 10 - calibration connection flange; 11 - calibration connection flange hole; 12 - connection cable; 13 - calibration bench; 14 - display screen of calibration bench; 15 - 24V storage battery; 16 - switch of calibration bench; 17 - pressure guiding pipe of calibration bench; 18 - calibration joint. Specific implementation mode

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] As Figure 1 shown, a rapid calibration device for a capillary pressure transmitter provided by the present invention includes: a capillary pressure transmitter 1, a diaphragm box 2 of the capillary pressure transmitter, a capillary pressure transmitter and its flange fixing device 4, a capillary fixing rod 5, a capillary 6 of the capillary pressure transmitter, a flange 7 of the capillary pressure transmitter, a flange hole 8 of the capillary pressure transmitter, a flange fixing bolt 9, a calibration connection flange 10, a calibration connection flange hole 11, a connection cable 12, a calibration bench 13, a display screen 14 of the calibration bench, a storage battery 15, a switch 16 of the calibration bench, a pressure guiding pipe 17 of the calibration bench, and a calibration joint 18.

[0038] The capillary pressure transmitter and its flange fixing device 4 are made of transparent plastic. On both sides of the top surface of the capillary pressure transmitter and its flange fixing device 4, there are respectively a first groove and a second groove with openings upward. The size of the first groove matches the size of the capillary pressure transmitter 1, and the size of the second groove matches the size of the capillary pressure transmitter flange 7. The capillary pressure transmitter 1 is installed in the first groove, and the capillary pressure transmitter flange 7 is installed in the second groove. The height of the capillary pressure transmitter 1 is consistent with the height of the capillary pressure transmitter flange 7. The capillary pressure transmitter diaphragm box 2 is installed inside the capillary pressure transmitter 1 and is electrically connected to the capillary pressure transmitter 1. The capillary of the capillary pressure transmitter 6 is placed on the top surface of the capillary pressure transmitter and its flange fixing device 4, between the first groove and the second groove. One end of the capillary of the capillary pressure transmitter 6 is hermetically connected to the capillary pressure transmitter diaphragm box 2, and the other end of the capillary of the capillary pressure transmitter 6 is hermetically connected to the capillary pressure transmitter flange 7 through a connection joint. By keeping the height of the capillary pressure transmitter 1 consistent with the height of the capillary pressure transmitter flange 7, it can ensure that the capillary of the capillary pressure transmitter 6 can be placed horizontally on the capillary pressure transmitter and its flange fixing device 4. The center of the capillary pressure transmitter diaphragm box 2, the center of the capillary pressure transmitter flange 7, and the center of the capillary of the capillary pressure transmitter 6 are coaxially arranged, effectively ensuring the accuracy of the calibration zero point and the accuracy of the calibration work of the capillary pressure transmitter.

[0039] The calibration bench 13 is installed on one side of the capillary pressure transmitter and its flange fixing device 4 close to the second groove. The calibration connection flange 10 is installed in the second groove, on the side of the capillary pressure transmitter flange 7 away from the capillary pressure transmitter 1. The capillary pressure transmitter flange 7 is a flange with a central through-hole, and evenly spaced around the circumference of the central through-hole are capillary pressure transmitter flange holes 8. The calibration connection flange 10 is a flange with a central through-hole, and evenly spaced around the circumference of the central through-hole are calibration connection flange holes 11. The outer dimensions, the size and position of the central through-hole and the openings (i.e., the capillary pressure transmitter flange holes 8 and the calibration connection flange holes 11) of the calibration connection flange 10 and the capillary pressure transmitter flange 7 are kept consistent. The central through-hole of the capillary pressure transmitter flange 7 and the central through-hole of the calibration connection flange 10 are coaxially arranged. The flange fixing bolt 9 passes through the capillary pressure transmitter flange hole 8 and the calibration connection flange hole 11 in sequence, and hermetically connects the calibration connection flange 10 and the capillary pressure transmitter flange 7 through threaded connection.

[0040] The calibration joint 18 is provided with a central hole. The central hole of the calibration joint 18 is coaxially arranged with the central through hole of the calibration connection flange 10. The calibration joint 18 and the calibration connection flange 10 are hermetically connected by welding; one end of the calibration bench pressure guide pipe 17 is hermetically connected to the calibration joint 18 by welding, and the other end of the calibration bench pressure guide pipe 17 is hermetically connected to the calibration bench 13; through the hermetic connection of the calibration connection flange 10, the calibration joint 18, the calibration bench pressure guide pipe 17 and the calibration bench 13, a pressure chamber is formed.

[0041] After the installation and connection of the entire calibration device are completed, a sealed pressure chamber is formed among the calibration bench 13, the calibration bench pressure guide pipe 17, the calibration joint 18, the calibration connection flange 10, the capillary pressure transmitter flange 7, the capillary of the capillary pressure transmitter 6, and the diaphragm box 2 of the capillary pressure transmitter.

[0042] The capillary pressure transmitter 1 is electrically connected to the calibration bench 13 through the connection cable 12.

[0043] The capillary fixing rod 5 is fixedly installed on the top surface of the capillary pressure transmitter and its flange fixing device 4, between the first groove and the second groove, and is used for coiling the relatively long capillary of the capillary pressure transmitter 6. Placing the relatively long capillary of the capillary pressure transmitter 6 flat on the capillary pressure transmitter and its flange fixing device 4 can reduce the length of the capillary pressure transmitter and its flange fixing device 4.

[0044] The calibration bench display screen 14 is arranged on the calibration bench 13. The calibration bench display screen 14 is electrically connected to the calibration bench 13 and is used for displaying the current value converted by the capillary pressure transmitter 1.

[0045] The storage battery 15 is arranged inside the calibration bench 13. The storage battery 15 is electrically connected to the capillary pressure transmitter 1 and the calibration bench 13 respectively and is used for supplying power to the capillary pressure transmitter 1 and the calibration bench 13. In the present invention, the storage battery 15 is selected as a 24V storage battery, and the power storage capacity of the 24V storage battery can be configured according to actual needs.

[0046] The calibration bench switch 16 is arranged on the calibration bench 13. The calibration bench switch 16 is electrically connected to the calibration bench 13 and is used for controlling the opening and closing of the calibration bench 13.

[0047] It should be noted that in the device of the present invention, the length, width, height, etc. of the capillary pressure transmitter and its flange fixing device 4 can be adjusted according to actual needs; the height of the capillary fixing rod 5, the length of the connection cable 12, and the length of the calibration bench pressure guide pipe 17 can also be adjusted according to actual situations; the number of the capillary pressure transmitter and its flange fixing devices 4 can also be adjusted according to the number of the capillary pressure transmitter flanges 7.

[0048] Adopt the calibration method of a quick calibration device for a capillary pressure transmitter provided by the present invention, including the following steps:

[0049] Step (1), electrically connect the capillary pressure transmitter 1 to the calibration bench 13

[0050] Connect the capillary pressure transmitter 1 to the calibration bench 13 through the connection cable 12.

[0051] Step (2), supply power to the calibration bench 13 and the capillary pressure transmitter 1

[0052] Turn on the calibration bench switch 16, and the 24V battery 15 supplies power to the calibration bench 13 and the capillary pressure transmitter 1.

[0053] Step (3), transmit the pressure initiated by the calibration bench 13 into the sealed pressure chamber

[0054] The calibration bench 13 transmits the pressure through the calibration bench pressure guide tube 17 into the sealed pressure chamber formed among the calibration bench pressure guide tube 17, the calibration joint 18, the calibration connection flange 10, the capillary pressure transmitter flange 7, the capillary of the capillary pressure transmitter 6, and the diaphragm box 2 of the capillary pressure transmitter.

[0055] Step (4), the diaphragm box 2 of the capillary pressure transmitter transmits the pressure change to the capillary pressure transmitter 1

[0056] The diaphragm box 2 of the capillary pressure transmitter transmits according to the pressure change in the pressure chamber to the capillary pressure transmitter 1.

[0057] Step (5), the capillary pressure transmitter 1 converts the pressure change into a current value

[0058] The capillary pressure transmitter 1 converts the pressure change into a current value, and the current value is displayed on the calibration bench display screen 14 through the connection cable 12.

[0059] Step (6), compare the theoretical current value with the converted current value to judge the accuracy of the capillary pressure transmitter 1

[0060] By comparing the theoretical current value corresponding to the pressure change with the current value displayed on the calibration bench display screen 14, judge the accuracy of the capillary pressure transmitter 1. If the deviation exceeds the allowable value, adjust the adjustment key of the capillary pressure transmitter 1 until the deviation value of the current value is within the allowable range, thereby completing the calibration work of the capillary pressure transmitter 1.

[0061] The above has described the present invention in detail in conjunction with the drawings and embodiments, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. The content not described in detail in the present invention can all adopt the prior art.

Claims

1. A rapid calibration device for a capillary pressure transmitter, characterized in that, the device includes: a capillary pressure transmitter (1), a capillary pressure transmitter diaphragm box (2), a capillary pressure transmitter and its flange fixing device (4), a capillary of the capillary pressure transmitter (6), a flange of the capillary pressure transmitter (7), a calibration connection flange (10), a connection cable (12), a calibration bench (13) and a calibration bench pressure guide pipe (17); On both sides of the top surface of the capillary pressure transmitter and its flange fixing device (4), there are respectively a first groove and a second groove with openings upward. The size of the first groove matches the size of the capillary pressure transmitter (1), and the size of the second groove matches the size of the flange of the capillary pressure transmitter (7). The capillary pressure transmitter (1) is installed in the first groove, and the flange of the capillary pressure transmitter (7) is installed in the second groove. The height of the capillary pressure transmitter (1) is the same as the height of the flange of the capillary pressure transmitter (7). The capillary pressure transmitter diaphragm box (2) is installed inside the capillary pressure transmitter (1) and is electrically connected to the capillary pressure transmitter (1). The capillary of the capillary pressure transmitter (6) is placed on the top surface of the capillary pressure transmitter and its flange fixing device (4), between the first groove and the second groove. The capillary of the capillary pressure transmitter (6) is hermetically connected to the capillary pressure transmitter diaphragm box (2) and the flange of the capillary pressure transmitter (7) respectively. The centers of the capillary pressure transmitter diaphragm box (2), the flange of the capillary pressure transmitter (7) and the capillary of the capillary pressure transmitter (6) are coaxially arranged; The calibration bench (13) is installed on one side of the capillary pressure transmitter and its flange fixing device (4) close to the flange of the capillary pressure transmitter (7); the calibration connection flange (10) is installed on the top surface of the capillary pressure transmitter and its flange fixing device (4), on the side of the flange of the capillary pressure transmitter (7) away from the capillary pressure transmitter (1). The calibration connection flange (10) is hermetically connected to the flange of the capillary pressure transmitter (7); the calibration bench pressure guide pipe (17) is hermetically connected to the calibration bench (13) and the calibration connection flange (10) respectively; The capillary pressure transmitter (1) is electrically connected to the calibration bench (13) through the connection cable (12).

2. The rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, the calibration connection flange (10) is hermetically connected to the flange of the capillary pressure transmitter (7) through flange fixing bolts (9).

3. The rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, the device further includes a capillary fixing rod (5), and the capillary fixing rod (5) is fixedly installed on the top surface of the capillary pressure transmitter and its flange fixing device (4), between the capillary pressure transmitter (1) and the flange of the capillary pressure transmitter (7).

4. The rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, The device further includes a calibration table display screen (14). The calibration table display screen (14) is arranged on the calibration table (13), and the calibration table display screen (14) is electrically connected to the calibration table (13).

5. A rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, the device further includes a storage battery (15). The storage battery (15) is arranged inside the calibration table (13), and the storage battery (15) is electrically connected to the capillary pressure transmitter (1) and the calibration table (13) respectively.

6. A rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, the device further includes a calibration table switch (16). The calibration table switch (16) is arranged on the calibration table (13), and the calibration table switch (16) is electrically connected to the calibration table (13).

7. A rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, the capillary pressure transmitter and its flange fixing device (4) are made of plastic material.

8. A calibration method using the rapid calibration device for a capillary pressure transmitter according to claim 1, characterized in that, the method includes the following steps: Step (1), electrically connect the capillary pressure transmitter (1) to the calibration table (13); Step (2), supply power to the calibration table (13) and the capillary pressure transmitter (1); Step (3), transmit the pressure initiated by the calibration table (13) to the sealed pressure chamber; Step (4), the capillary pressure transmitter diaphragm box (2) transmits the pressure change to the capillary pressure transmitter (1); Step (5), the capillary pressure transmitter (1) converts the pressure change into a current value; Step (6), compare the theoretical current value with the converted current value to judge the accuracy of the capillary pressure transmitter (1).

9. A rapid calibration method for a capillary pressure transmitter according to claim 8, characterized in that, the sealed pressure chamber in the step (3) is composed of the calibration table (13), the calibration table pressure guide pipe (17), the calibration connection flange (10), the capillary pressure transmitter flange (7), the capillary pressure transmitter capillary (6) and the capillary pressure transmitter diaphragm box (2).

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