Leakage detection sensor for heavy water reactor loading and unloading machine

Abstract

The invention belongs to the technical field of instrument control, and particularly relates to a heavy water reactor loading and unloading machine leakage detection sensor which comprises a shell, silicone oil, an oil pipe, an isolation diaphragm, a basic silicon wafer, a measuring silicon wafer, a socket and an external plug. An oil pipe is arranged in the center of the inner bottom of the shell, isolation diaphragms are arranged at the top of the shell and the bottom of the oil pipe, and silicone oil is injected into the shell and the oil pipe; an end is arranged at the bottom of the shell; a basic silicon wafer is arranged at the top of the oil pipe, and a measuring silicon wafer is arranged at the top of the basic silicon wafer; a socket is arranged at the top of one side of the shell and electrically connected with the measuring silicon wafer through a wire, and an external plug is inserted into one side of the socket. According to the invention, the reliability of equipment can be effectively improved, the occurrence frequency of equipment faults during operation is reduced, and the problem that the device cannot be normally used due to the fact that the measured silicon wafer is lack of an effective protection structure and cannot be recovered after the deformation of the measured silicon wafer exceeds the limit is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of instrument control, and in particular relates to a leakage detection sensor for a heavy water pile loader and unloader. Background Art

[0002] Heavy water reactor nuclear power plants have the characteristics of continuous refueling. To ensure refueling, the power plant is designed with a complete refueling system to serve it. The core equipment is the refueling machine, among which the leakage detection transmitter of the refueling machine is used to detect the leakage of heavy water in the nozzle cavity when the nozzle of the refueling machine is clamped on the reactor channel and pressure is established. The existing heavy water reactor refueling machine leakage detection transmitter is essentially a differential pressure transmitter, which adopts a single crystal silicon sensor design. Its sensitive element is to diffuse P-type impurities onto N-type silicon wafers to form an extremely thin conductive P-type layer. The lead wires are welded to form a "single crystal silicon strain gauge". Its electrical performance is to make a full dynamic piezoresistive effect Wheatstone bridge. The piezoresistive effect Wheatstone bridge is combined with an elastic element (i.e., its N-type silicon base). The medium pressure is transmitted to the positive cavity side of the silicon diaphragm through the sealing silicone oil, and a pressure difference is formed with the medium acting on the negative pressure cavity side. The pressure difference makes the bridge unbalanced and outputs a signal corresponding to the pressure change. The signal output by the Wheatstone bridge is transmitted and processed to generate a 4-20mA standard signal output that is linearly related to the pressure change. For a gauge pressure sensor, the negative cavity side is usually connected to the atmosphere. For an absolute pressure sensor, the negative cavity side is usually a vacuum chamber. For a differential pressure sensor, the pressure-conducting medium on the negative cavity side is usually the same as that on the positive cavity side.

[0003] The measuring silicon chip in the existing heavy water reactor loader and unloader leakage detection sensor lacks an effective protective structure. When the measuring silicon chip deformation exceeds the limit, it cannot be restored, which causes the device to be unable to be used normally. It is manifested as the output value of the loader and unloader leakage detector drifts to the maximum value after the nozzle clamps and increases the pressure, and remains unchanged after the pressure is released. This phenomenon has occurred many times during the operation of the loader and unloader, and can only be solved by replacing spare parts. At the same time, the connection of the existing heavy water reactor loader and unloader leakage detection sensor lacks an effective limit fixing mechanism. After the external plug is plugged into the sensor socket and connected, the external plug is easily pulled off. Summary of the invention

[0004] The purpose of the present invention is to provide a leakage detection sensor for a heavy water reactor loader and unloader, which can effectively improve the reliability of the equipment, reduce the number of equipment failures during operation, and solve the problem that the measuring silicon wafer in the existing leakage detection sensor for a heavy water reactor loader and unloader lacks an effective protective structure, and the measuring silicon wafer cannot be restored after the deformation exceeds the limit, thereby causing the device to be unable to be used normally.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] A leakage detection sensor for a heavy water reactor loader and unloader, the detection sensor comprising a shell, silicone oil, an oil pipe, an isolation diaphragm, a basic silicon wafer, a measuring silicon wafer, a socket, and an external plug; an oil pipe is provided at the center of the inner bottom of the shell, and isolation diaphragms are provided at the top of the shell and the bottom of the oil pipe, and silicone oil is injected into the shell and the oil pipe; an end is provided at the bottom of the shell; a basic silicon wafer is provided at the top of the oil pipe, and a measuring silicon wafer is provided at the top of the basic silicon wafer; a socket is provided at the top of one side of the shell, and the socket is electrically connected to the measuring silicon wafer through a wire, and an external plug is inserted into one side of the socket.

[0007] At least two groups of equidistant first mounting rods are welded around the top of the oil pipe, and an upper concave arc limit plate is welded on the top of the first mounting rod, and the upper concave arc limit plate is located above the measuring silicon wafer; a lower concave arc limit plate is fixedly installed at the top of the oil pipe through a second mounting rod, and the lower concave arc limit plate is located below the measuring silicon wafer.

[0008] One side of the shell is located at the upper and lower sides of the socket and is rotatably mounted with an L-shaped rod through a rotating structure. One end of the L-shaped rod is screwed with a top bolt, and the top bolt is rotatably mounted with a top block through a bearing at one end facing the socket.

[0009] The rotating structure comprises a concave frame, a rotating rod and a through hole. One side of the concave frame is fixedly connected to the shell, and the interior of the concave frame is fixedly connected with the rotating rod. One end of the L-shaped rod is provided with a through hole, and the rotating rod passes through the through hole.

[0010] A threaded hole is provided at a position corresponding to the top fixing bolt at one end of the L-shaped rod, the top fixing bolt passes through the threaded hole, and the top fixing bolt is connected to the L-shaped rod through the threaded hole.

[0011] A screw block is arranged at one end of the top fixing bolt away from the socket, and anti-skid patterns are arranged on the surface of the screw block.

[0012] A fixing ring is fixedly connected to the bottom of the outer shell, and at least two groups of equidistant fixing bolts are screwed on one circle of the fixing ring, and the fixing ring is fixedly installed on the heavy water pile loading and unloading machine through the fixing bolts.

[0013] The outside of the end head is provided with a thread, and the end head corresponds to the oil pipe.

[0014] The beneficial technical effects of the present invention are:

[0015] 1. The present invention provides a heavy water stack loader and unloader leakage detection sensor, which reduces the influence of working static pressure on the measuring silicon chip by setting an isolation diaphragm and injecting silicone oil into the shell and the oil pipe. When the working static pressure is loaded into the positive and negative cavities of the measuring silicon chip, the working static pressure is balanced and loaded onto the measuring silicon chip through the silicone oil in the inner cavity of the shell and the silicone oil in the inner cavity of the oil pipe, and the two are offset, so that the bending deformation of the measuring silicon chip to the working static pressure is extremely small, which greatly improves the static pressure influence performance of the device.

[0016] 2. The present invention provides a leakage detection sensor for a heavy water reactor loader and unloader, which blocks and limits the measuring silicon wafer by setting an upper concave arc limit plate and a lower concave arc limit plate. Under the condition of excessive internal and external pressure difference, when the deformation of the measuring silicon wafer reaches a certain degree, if the measuring silicon wafer deforms upward, the upper concave arc limit plate blocks and limits the measuring silicon wafer, and if the measuring silicon wafer deforms downward, the lower concave arc limit plate blocks and limits the measuring silicon wafer. It can effectively avoid the situation where the deformation of the measuring silicon wafer exceeds its limit and cannot be restored, thereby extending the service life of the device.

[0017] 3. A leakage detection sensor for a heavy water pile loading and unloading machine provided by the present invention prevents the external plug from falling off by providing a rotating structure, an L-shaped rod, a top fixing bolt and a top block. After the external plug is docked with the socket, the L-shaped rod can be rotated by the rotating structure, and then the top fixing bolt can be screwed to fix the top block on one side of the external plug, so that the external plug can be fixed and limited, which can effectively prevent the external plug from being pulled and separated from the socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A front cross-sectional view of a leakage detection sensor for a heavy water reactor loader and unloader provided by the present invention;

[0019] Figure 2 A front view of a leakage detection sensor for a heavy water stack loader and unloader provided by the present invention;

[0020] Figure 3 This is a schematic diagram of the enlarged structure of part A in a leakage detection sensor for a heavy water reactor loader and unloader provided by the present invention;

[0021] Figure 4 This is a schematic diagram of the enlarged structure of part B in a leakage detection sensor for a heavy water reactor loader and unloader provided by the present invention.

[0022] In the figure: 1-housing; 101-end; 102-fixing ring; 103-fixing bolt; 2-silicon oil; 3-oil pipe; 4-isolating diaphragm; 5-basic silicon wafer; 6-measuring silicon wafer; 7-upper concave arc limit plate; 701-first mounting rod; 8-lower concave arc limit plate; 801-second mounting rod; 9-socket; 10-external plug; 11-rotating structure; 1101-concave frame; 1102-rotating rod; 1103-through hole; 12-L-shaped rod; 1201-threaded hole; 13-top fixing bolt; 14-top block. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] The present invention provides a leakage detection sensor for a heavy water stack loader and unloader, comprising a housing 1, silicone oil 2, an oil pipe 3, an isolation diaphragm 4, a basic silicon chip 5, a measuring silicon chip 6, a socket 9, and an external plug 10.

[0025] like Figure 1-3 As shown, an oil pipe 3 is provided at the center of the inner bottom of the housing 1, and an isolation diaphragm 4 is provided at the top of the housing 1 and the bottom of the oil pipe 3. The isolation diaphragm 4 is mainly used to seal and store the silicone oil 2. Silicone oil 2 is injected into the interior of the housing 1 and the oil pipe 3, and the inner cavity of the oil pipe 3 and the inner cavity of the housing 1 reach pressure balance. When the working static pressure is loaded to the positive and negative cavities of the measuring silicon chip 6, the working static pressure is balanced and loaded to the measuring silicon chip 6 through the silicone oil 2 in the inner cavity of the housing 1 and the silicone oil 2 in the inner cavity of the oil pipe 3, and the working static pressure is offset, so that the bending deformation of the measuring silicon chip 6 to the working static pressure is extremely small. This treatment greatly improves the static pressure influence performance of the device. An end 101 is provided at the bottom of the outer 1. Preferably, the outer end 101 is provided with a thread, and the end 101 is screwed into and installed on the heavy water reactor loader and unloader through the external thread, and the end 101 corresponds to the oil pipe 3. Preferably, a fixing ring 102 is welded on the bottom of the shell 1, and at least two groups of equidistant fixing bolts 103 are screwed on the fixing ring 102. The fixing bolts 103 are screwed into the heavy water reactor loader and unloader again. The fixing ring 102 is fixedly installed on the heavy water reactor loader and unloader by the fixing bolts 103, thereby reinforcing the installation of the device and ensuring the stability of the device installed on the heavy water reactor loader and unloader. A basic silicon wafer 5 is provided on the top of the oil pipe 3, and a measuring silicon wafer 6 is provided on the top of the basic silicon wafer 5. The measuring silicon wafer 6 is deformed under the action of the internal and external pressure difference, and generates an electrical signal to measure the pressure difference change of the heavy water reactor loading and unloading in turn, and then leak detection is performed according to the pressure difference change. A socket 9 is provided on the top of one side of the shell 1, and the socket 9 is electrically connected to the measuring silicon wafer 6 through a wire. An external plug 10 is inserted into one side of the socket 9. The socket 9 facilitates the external plug 10 to be inserted and connected, thereby connecting with an external host, and converting the electrical signal through the external host to display the differential pressure.

[0026] In this embodiment, when the leakage detection sensor of the heavy water reactor loader and unloader is used, the device is screwed into the heavy water reactor loader and unloader through the external thread on the end 101, and then the fixing bolt 103 is screwed into the heavy water reactor loader and unloader again, so as to reinforce the installation of the device and ensure the stability of the device installed on the heavy water reactor loader and unloader. At this time, the measuring silicon chip 6 is deformed under the action of the internal and external pressure difference, and an electrical signal is generated to measure the pressure difference change of the heavy water reactor loading and unloading. Then the external host is connected to the socket 9 through the external plug 10, and the external host converts the electrical signal to display the differential pressure. Then the personnel detect the leakage of the heavy water reactor loader and unloader according to the pressure difference change. When the working static pressure is loaded on the positive and negative cavities of the measuring silicon chip 6, the working static pressure is balanced and loaded on the measuring silicon chip 6 through the inner cavity silicone oil 2 of the shell 1 and the inner cavity silicone oil 2 of the oil pipe 3, and the mutual offset is achieved, so that the bending deformation of the measuring silicon chip 6 to the working static pressure is extremely small, and this treatment greatly improves the static pressure influence performance of the device.

[0027] like Figure 1 and Figure 3 As shown, at least two groups of equidistant first mounting rods 701 are welded around the top of the oil pipe 3, and an upper concave arc-shaped limit plate 7 is welded on the top of the first mounting rod 701, and the upper concave arc-shaped limit plate 7 is located above the measuring silicon wafer 6, and the upper concave arc-shaped limit plate 7 is mainly used to limit and protect the upward deformation of the measuring silicon wafer 6. A lower concave arc-shaped limit plate 8 is fixedly installed at the top of the oil pipe 3 through a second mounting rod 801, and the lower concave arc-shaped limit plate 8 is located below the measuring silicon wafer 6, and the lower concave arc-shaped limit plate 8 is mainly used to limit and protect the downward deformation of the measuring silicon wafer 6.

[0028] In the present embodiment, when the device is in use, if the internal and external pressure difference of the measuring silicon wafer 6 is large, the upper concave arc-shaped limit plate 7 can limit and protect the upward deformation of the measuring silicon wafer 6, and the lower concave arc-shaped limit plate 8 can limit and protect the downward deformation of the measuring silicon wafer 6. Therefore, it can effectively avoid the deformation of the measuring silicon wafer 6 beyond its limit and cannot be restored, thereby extending the service life of the device.

[0029] like Figure 4 As shown, one side of the housing 1 is located at the upper and lower sides of the socket 9 and is rotatably mounted with an L-shaped rod 12 through a rotating structure 11, one end of the L-shaped rod 12 is screwed with a top fixing bolt 13, and the top fixing bolt 13 is rotatably mounted with a top block 14 through a bearing at one end facing the socket 9. Preferably, a threaded hole 1201 is provided at one end of the L-shaped rod 12 at a position corresponding to the top fixing bolt 13, the top fixing bolt 13 passes through the threaded hole, and the top fixing bolt 13 is connected to the L-shaped rod 12 through the threaded hole 1201. Preferably, a screw block is provided at the end of the top fixing bolt 13 away from the socket 9, and an anti-slip pattern is provided on the surface of the screw block.

[0030] like Figure 4As shown, the rotating structure 11 includes a concave frame 1101, a rotating rod 1102 and a through hole 1103. One side of the concave frame 1101 is fixedly connected to the housing 1 by welding, and the interior of the concave frame 1101 is fixedly connected to the rotating rod 1102 by welding; one end of the L-shaped rod 12 is provided with a through hole 1103, and the rotating rod 1102 passes through the through hole.

[0031] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A heavy water stack loader and unloader leakage detection sensor, characterized in that: The detection sensor comprises a housing (1), silicone oil (2), an oil pipe (3), an isolation diaphragm (4), a basic silicon chip (5), a measuring silicon chip (6), a socket (9), and an external plug (10); the oil pipe (3) is provided at the center of the inner bottom of the housing (1), and the top of the housing (1) and the bottom of the oil pipe (3) are both provided with isolation diaphragms (4), and the inside of the housing (1) and the oil pipe (3) are both injected with silicone oil (2); a terminal (101) is provided at the bottom of the housing (1); the top of the oil pipe (3) is provided with a basic silicon chip (5), and the top of the basic silicon chip (5) is provided with a measuring silicon chip (6); a socket (9) is provided at the top of one side of the housing (1), and the socket (9) is electrically connected to the measuring silicon chip (6) through a wire, and an external plug (10) is inserted into one side of the socket (9).

2. A heavy water reactor loader and unloader leakage detection sensor according to claim 1, characterized in that: At least two groups of equidistant first mounting rods (701) are welded around the top of the oil pipe (3), and an upper concave arc-shaped limit plate (7) is welded on the top of the first mounting rod (701), and the upper concave arc-shaped limit plate (7) is located above the measuring silicon wafer (6); a lower concave arc-shaped limit plate (8) is fixedly mounted at the top of the oil pipe (3) through a second mounting rod (801), and the lower concave arc-shaped limit plate (8) is located below the measuring silicon wafer (6).

3. A heavy water reactor loader and unloader leakage detection sensor according to claim 1, characterized in that: One side of the housing (1) is located at the upper and lower sides of the socket (9) and is rotatably mounted with an L-shaped rod (12) through a rotating structure (11); one end of the L-shaped rod (12) is screwed with a top bolt (13); and the top bolt (13) is rotatably mounted with a top block (14) through a bearing at one end facing the socket (9).

4. A heavy water stack loader and unloader leakage detection sensor according to claim 3, characterized in that: The rotating structure (11) comprises a concave frame (1101), a rotating rod (1102) and a through hole (1103); one side of the concave frame (1101) is fixedly connected to the housing (1), and the interior of the concave frame (1101) is fixedly connected to the rotating rod (1102); one end of the L-shaped rod (12) is provided with a through hole (1103), and the rotating rod (1102) passes through the through hole.

5. A heavy water stack loader and unloader leakage detection sensor according to claim 3, characterized in that: A threaded hole (1201) is provided at one end of the L-shaped rod (12) at a position corresponding to the top fixing bolt (13), the top fixing bolt (13) passes through the threaded hole (1201), and the top fixing bolt (13) is connected to the L-shaped rod (12) through the threaded hole (1201).

6. A heavy water stack loader and unloader leakage detection sensor according to claim 3, characterized in that: A screw block is provided at one end of the fixing bolt (13) away from the socket (9), and a surface of the screw block is provided with anti-slip grooves.

7. A heavy water stack loader and unloader leakage detection sensor according to claim 1, characterized in that: A fixing ring (102) is fixedly connected to the bottom of the outer shell (1) around one circumference, and at least two groups of equidistant fixing bolts (103) are screwed around one circumference of the fixing ring (102), and the fixing ring (102) is fixedly installed on the heavy water reactor loading and unloading machine through the fixing bolts (103).

8. A heavy water reactor loader and unloader leakage detection sensor according to claim 1, characterized in that: The exterior of the end head (101) is provided with threads, and the end head corresponds to the oil pipe (3).

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