A pressure detection module for a heavy water reactor nuclear power plant

Abstract

The present application belongs to the technical field of instrument control, and relates to a heavy water reactor nuclear power plant pressure detection module, comprising a sensor base, a sensor sensing structure, a charging and discharging machine leakage detection transmitter fixing structure, a force transmission rod, the sensor sensing structure comprising an elastic sheet, a strain gauge and an enameled wire, the charging and discharging machine leakage detection transmitter fixing structure comprising a movable block support and a movable block, the elastic sheet being mounted on the sensor base, two resistance strain gauges being pasted on the side surface of the elastic sheet, and the enameled wire being led out from the strain gauges, the movable block being placed in a groove of the movable block support, a through hole being provided on the movable block and the movable block support, a rotating column of the charging and discharging machine leakage detection transmitter penetrating through the sensor base and the through hole, the movable block and the movable block support being locked on the rotating column through a support fixing bolt, and the force transmission rod being fixedly connected with the elastic sheet and the movable block support at two ends. The present application can effectively optimize the equipment performance of the charging and discharging machine leakage detection transmitter, and has high precision, good linearity and high reliability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of instrument control, and particularly relates to a heavy water reactor nuclear power plant pressure detection module. BACKGROUND

[0002] The heavy water reactor nuclear power plant has the characteristics of refueling without stopping the reactor, and a complete set of refueling systems is designed to serve the refueling, and the most core equipment is the refueling machine, and the function of the refueling machine leakage detection transmitter is to detect the leakage of the pipe nozzle cavity heavy water under the condition that the pipe nozzle of the refueling machine is clamped on the reactor channel and the pressure is established. Its essence is a differential pressure transmitter, which promotes the deformation of the internal sensing module through differential pressure, and generates a 4-20mA signal output in linear relationship with the pressure through the transmission processing.

[0003] The existing refueling machine leakage detection transmitter has gradually decreased reliability after long-term operation, and often appears the situation of output value drift and cannot be used, and can only be replaced by spare parts.

[0004] Therefore, it is urgent to develop a module for detecting the equipment performance of the refueling machine leakage detection transmitter, for optimizing the equipment performance of the refueling machine leakage detection transmitter, and effectively improving the reliability of the field equipment. SUMMARY

[0005] The application aims to provide a heavy water reactor nuclear power plant pressure detection module, which can be installed in the heavy water reactor refueling machine leakage detection transmitter, can effectively optimize the equipment performance of the refueling machine leakage detection transmitter, has multiple characteristics such as high precision, good linearity and high reliability. The actual verification on site can run perfectly, and effectively improve the reliability of the field equipment.

[0006] The technical scheme for realizing the application:

[0007] A heavy water reactor nuclear power plant pressure detection module, the detection module comprises a sensor base, a sensor sensing structure, a refueling machine leakage detection transmitter fixing structure, a force transmission rod, the sensor sensing structure comprises an elastic sheet, a strain gauge and an enameled wire, the refueling machine leakage detection transmitter fixing structure comprises a movable block support and a movable block, the elastic sheet is installed on the sensor base, two resistance strain gauges are attached to the side surface of the elastic sheet, and the enameled wire is led out from the strain gauge, the movable block is placed in the groove of the movable block support, a through hole is arranged on the movable block and the movable block support, a rotating column of the refueling machine leakage detection transmitter penetrates the sensor base and the through hole, and the movable block and the movable block support are locked on the rotating column through a support fixing bolt; the force transmission rod is fixedly connected with the elastic sheet and the movable block support at two ends.

[0008] The detection module further comprises a pressing block, the elastic sheet is located between the pressing block and the sensor base, and the pressing block is connected with the elastic sheet.

[0009] The pressing block and the elastic sheet are connected by a screw.

[0010] The pressing block and the elastic sheet are installed on the sensor base through a positioning pin.

[0011] A transition pad is pasted on the plane of the sensor base, and the transition pad is used for transferring the enameled wire.

[0012] The force transmission rod is a bronze wire with a diameter of 0.2-0.3 mm.

[0013] The force transmission rod is connected to the elastic sheet and the movable block support through welding.

[0014] The sensor base is provided with a slotted hole for positioning and fixing with a mounting point on the pressure test main body, and the sensor base and the pressure test main body are locked through a fixing bolt.

[0015] The beneficial technical effects of the present application are that:

[0016] 1. The heavy water reactor nuclear power plant pressure detection module provided by the present application is suitable for a heavy water reactor nuclear power plant loading and unloading machine leakage detection transmitter, can effectively improve the performance of the heavy water reactor nuclear power plant loading and unloading machine leakage detection transmitter, improve the reliability of the equipment, and reduce the failure rate during the online operation of the transmitter.

[0017] 2. The heavy water reactor nuclear power plant pressure detection module provided by the present application has high detection accuracy and good linearity. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic view of the heavy water reactor nuclear power plant pressure detection module provided by the present application;

[0019] Figure 2 The figure is a front view of the heavy water reactor nuclear power plant pressure detection module provided by the present application;

[0020] Figure 3 The figure is a top view of the heavy water reactor nuclear power plant pressure detection module provided by the present application;

[0021] Figure 4 The figure is a left view of the heavy water reactor nuclear power plant pressure detection module provided by the present application.

[0022] In the figure: 1 - fixing bolt; 2 - sensor base; 3 - movable block support; 4 - force transmission rod; 5 - elastic sheet; 6 - strain gauge; 7 - enameled wire; 8 - pressing block; 9 - screw; 10 - transition pad; 11 - movable block; 12 - support fixing bolt; 13 - fixed hole; 14 - positioning pin. DETAILED DESCRIPTION

[0023] The application will be further described in detail below with reference to the accompanying drawings and examples.

[0024] The heavy water reactor nuclear power plant pressure detection module provided by the application mainly transmits the electric signal generated by the resistance strain gauge through the mechanical deformation principle of the monitored rotation angle to achieve the purpose of detecting the pressure value.

[0025] As shown in the accompanying drawings and examples, Figures 1-4 The heavy water reactor nuclear power plant pressure detection module provided by the application comprises a sensor base 2, a sensor sensing structure, a loader leakage detection transmitter fixing structure and a force transmission rod 4. The sensor sensing structure comprises an elastic sheet 5, a strain gauge 6 and an enameled wire 7. The loader leakage detection transmitter fixing structure comprises a movable block support 3 and a movable block 11.

[0026] The sensor base 2 is provided with a slotted hole for positioning and fixing with the mounting point on the pressure test main body and is locked by a fixing bolt 1.

[0027] The elastic sheet 5 is a metal elastic sheet. Two resistance strain gauges 6 are pasted on the side surface of the elastic sheet 5 in the set deformation area. The enameled wire 7 is led out from the strain gauge 6. The elastic sheet 5 is designed into an irregular shape according to the pressure requirement to be measured. Since the elastic sheet 5 is the core device of the sensor measurement, the position of the elastic sheet 5 must be accurately controlled in size. Therefore, the elastic sheet 5 is provided with a positioning hole in which a positioning pin 14 is inserted. The elastic sheet 5 forms an assembly after the strain gauge 6 is pasted by a process. The elastic sheet 5 is provided with a pressing block 8. The elastic sheet 5 is located between the pressing block 8 and the sensor base 2. The elastic sheet 5 is provided with two screw through holes. Two screws 9 pass through the screw through holes to fix the pressing block 8 on the elastic sheet 5 and are installed on the sensor base 2 in cooperation with the accurate positioning pin 14. A fixing hole 13 is arranged at the weak part of the tail of the elastic sheet 5. A force transmission rod 4 passes through the fixing hole 13 and is fixed by soldering.

[0028] The movable block 11 is placed in the groove of the movable block support 3. The movable block 11 and the movable block support 3 are provided with a through hole through which the rotating column of the loader leakage detection transmitter passes. The movable block 11 and the movable block support 3 are locked on the rotating column by a support fixing bolt 12.

[0029] A transition pad 10 is pasted on the plane on which the sensor base 2 is installed. The transition pad 10 functions to transfer the enameled wire 7 through a relay to avoid affecting the sensor sensing structure.

[0030] The force transmission rod 4 is a bronze wire with a diameter of 0.2-0.3 mm. Since the measured pressure is low and the process of converting the rotation angle into deformation is involved, the material of the bronze wire is very suitable for the requirement. One end of the force transmission rod 4 passes through the fixing hole 13 designed on the elastic sheet 5 and is fixed by a process of welding. The other end of the force transmission rod 4 is erected in the specially designed groove of the movable block support 3 and is fixed by a process of welding.

[0031] The heavy water reactor nuclear power plant pressure detection module provided by the application is used for detecting the leakage detection transmitter of the charging and discharging machine, and the detection is specifically as follows:

[0032] The movable block 11 is placed in the groove of the movable block support 3, and the assembly is formed by the support fixing bolt 12, and then the matching height of the positioning tool is adjusted according to the installation height of the elastic sheet 5, and the movable block 11 is locked on the rotating column of the leakage detection transmitter of the charging and discharging machine through the support fixing bolt 12, so that the movable block 11 can transmit rotation.

[0033] When the pressure module is installed on the leakage detection transmitter of the heavy water reactor charging and discharging machine, when the transmitter detects pressure, the rotating column will have angular displacement, and the rotating column will transmit the rotation to the movable block 11. The movable block 11 transmits the rotation to the elastic sheet 5 through the force transmission rod 4, the elastic sheet deforms to drive the strain gauge 6 to generate a deformation variable. The pressure module designs the core parameters such as the related deformation variable and the material thickness of the sensor elastic sheet through the maximum angle of rotation, finally converts the rotation angle into a deformation variable, and converts it into a weak voltage signal output to the transmission module, and then the transmission module outputs to the acquisition unit.

[0034] The application has been described in detail above in combination with the drawings and examples, but the application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. The contents not described in detail in the application can adopt the prior art.

Claims

1. A pressure detection module for a heavy water reactor nuclear power plant, characterized in that: The detection module comprises: a sensor base (2), a sensor sensing structure, a fixed structure of a leakage detection transmitter for a loading and unloading machine, and a force transmission rod (4); the sensor sensing structure comprises an elastic sheet (5), a strain gauge (6), and an enameled wire (7); the fixed structure of the leakage detection transmitter for a loading and unloading machine comprises a movable block bracket (3) and a movable block (11); the elastic sheet (5) is mounted on the sensor base (2); two resistance strain gauges (6) are adhered to the side of the elastic sheet (5); the enameled wire (7) is led out from the strain gauge (6); the movable block (11) is placed in a groove of the movable block bracket (3); a through hole is provided on the movable block (11) and the movable block bracket (3); a rotating column of the leakage detection transmitter for the loading and unloading machine passes through the sensor base (2) and the through hole; the movable block (11) and the movable block bracket (3) are locked on the rotating column by a bracket fixing bolt (12); and the two ends of the force transmission rod (4) are fixedly connected to the elastic sheet (5) and the movable block bracket (3) respectively.

2. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The detection module further comprises a pressing block (8), an elastic sheet (5) is located between the pressing block (8) and the sensor base (2), and the pressing block (8) is connected to the elastic sheet (5).

3. A heavy water reactor nuclear power plant pressure detection module according to claim 2, characterized in that: The pressing block (8) is connected to the elastic sheet (5) via screws (9).

4. A heavy water reactor nuclear power plant pressure detection module according to claim 2, characterized in that: The pressing block (8) and the elastic sheet (5) are mounted on the sensor base (2) via positioning pins (14).

5. The heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: A transition pad (10) is pasted on the plane of the sensor base (2) by a process, and the transition pad (10) is used for transferring the enameled wire (7).

6. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The force transmission rod (4) is a bronze wire with a diameter of 0.2 to 0.3 mm.

7. The heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The force transmission rod (4) is connected to the elastic sheet (5) and the movable block bracket (3) by welding.

8. The pressure detection module for a heavy water reactor nuclear power plant according to claim 1, characterized in that: The sensor base (2) is provided with a slotted hole for positioning and fixing with the mounting point on the pressure test body, and the sensor base (2) and the pressure test body are locked by fixing bolts (1).

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