A leak detection sensor for a heavy water stacker loading and unloading machine

Abstract

This invention belongs to the field of instrumentation and control technology, specifically relating to a leak detection sensor for a heavy water stacker loading and unloading machine. The sensor includes a housing, silicone oil, an oil pipe, a separating diaphragm, a base silicon wafer, a measuring silicon wafer, a socket, and an external plug. The oil pipe is located at the center of the bottom of the housing, and separating diaphragms are located at the top of the housing and the bottom of the oil pipe. Silicone oil is injected into both the housing and the oil pipe. An end is located at the bottom of the housing. The base silicon wafer is located at the top of the oil pipe, and the measuring silicon wafer is located at the top of the base silicon wafer. A socket is located on the top side of the housing, and the socket is electrically connected to the measuring silicon wafer via a wire. An external plug is inserted into one side of the socket. This invention effectively improves equipment reliability, reduces the number of equipment failures during operation, and solves the problem that the measuring silicon wafer lacks an effective protective structure, leading to irreversible deformation after exceeding its limits, thus causing the device to malfunction.

Description

Technical Field

[0001] This invention belongs to the field of instrumentation and control technology, specifically relating to a leakage detection sensor for a heavy water stacker loading and unloading machine. Background Technology

[0002] Heavy water reactor nuclear power plants are characterized by refueling without reactor shutdown. To ensure refueling, the power plant is designed with a complete refueling system, the most crucial piece of equipment being the refueling machine. The leak detection transmitter on the refueling machine detects heavy water leakage in the nozzle cavity when the refueling machine nozzle is clamped onto the reactor channel and pressure is established. Existing heavy water reactor refueling machine leak detection transmitters are essentially differential pressure transmitters, employing a single-crystal silicon sensor design. Their sensing element is formed by diffusing P-type impurities onto an N-type silicon wafer, creating an extremely thin conductive P-type layer. Soldering leads onto this layer creates a "single-crystal silicon strain gauge." Its electrical performance is achieved by creating a fully dynamic piezoresistive Wheatstone bridge. This piezoresistive Wheatstone bridge is combined with an elastic element (i.e., its N-type silicon substrate). The medium pressure is transmitted through sealing silicone oil to the positive cavity side of the silicon diaphragm, creating a pressure difference with the medium acting on the negative pressure cavity side. This pressure difference causes the bridge to become unbalanced, outputting a signal corresponding to the pressure change. After the signal output from the Wheatstone bridge is processed by the transmitter, a standard 4-20mA signal output is generated that is linearly related to the pressure change. For gauge pressure sensors, the negative cavity side is usually open to the atmosphere. For absolute pressure sensors, the negative cavity side is usually a vacuum chamber. For differential pressure sensors, the pressure-conducting medium on the negative cavity side is usually the same as that on the positive cavity side.

[0003] The existing leakage detection sensors for heavy water reactor loading and unloading machines lack an effective protective structure for the measuring silicon wafer. When the wafer deforms beyond its limits, it cannot recover, causing the device to malfunction. Specifically, after the nozzle clamp increases the pressure, the leakage detector output value drifts to its maximum value and remains unchanged after depressurization. This phenomenon has occurred repeatedly during the operation of the loading and unloading machine, and can only be resolved by replacing spare parts. Furthermore, the existing leakage detection sensors for heavy water reactor loading and unloading machines lack effective limiting and fixing mechanisms at the connection points. After the external plug is plugged into the sensor socket, it is easily detached due to pulling. Summary of the Invention

[0004] The purpose of this invention is to provide a leakage detection sensor for heavy water stack loading and unloading machines, which can effectively improve equipment reliability, reduce the number of equipment failures during operation, and solve the problem that the measuring silicon wafer in existing heavy water stack loading and unloading machine leakage detection sensors lacks an effective protective structure, and that the silicon wafer cannot be restored after deformation exceeds the limit, thus causing the device to malfunction.

[0005] Technical solution to achieve the purpose of this invention:

[0006] A leakage detection sensor for a heavy water stacker loading and unloading machine includes a housing, silicone oil, an oil pipe, a diaphragm, a base silicon wafer, a measuring silicon wafer, a socket, and an external plug. The oil pipe is located at the center of the bottom of the housing, and diaphragms are located at the top of the housing and the bottom of the oil pipe. Silicone oil is injected into both the housing and the oil pipe. An end is located at the bottom of the housing. The base silicon wafer is located at the top of the oil pipe, and the measuring silicon wafer is located at the top of the base silicon wafer. A socket is located on the top side of the housing, and the socket is electrically connected to the measuring silicon wafer via a wire. An external plug is inserted into one side of the socket.

[0007] At least two sets of equidistant first mounting rods are welded around the top of the oil pipe, and an upper concave arc-shaped limiting plate is welded to the top of the first mounting rod, with the upper concave arc-shaped limiting plate located above the measuring silicon wafer; a lower concave arc-shaped limiting plate is fixedly installed at the top opening of the oil pipe by a second mounting rod, with the lower concave arc-shaped limiting plate located below the measuring silicon wafer.

[0008] An L-shaped rod is rotatably mounted on one side of the outer casing, located above and below the socket, via a rotating structure. A top bolt is screwed onto one end of the L-shaped rod, and a top block is rotatably mounted on the end of the top bolt facing the socket via a bearing.

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

[0010] The L-shaped rod has a threaded hole at one end corresponding to the fixing bolt. The fixing bolt passes through the threaded hole and is connected to the L-shaped rod through the threaded hole.

[0011] The end of the fixing bolt away from the socket is provided with a screw block, and the surface of the screw block is provided with anti-slip texture.

[0012] A fixing ring is fixedly connected to the bottom of the outer shell, and at least two sets of equidistant fixing bolts are screwed onto the circumference of the fixing ring. The fixing ring is fixedly installed on the heavy water stacker loading and unloading machine by the fixing bolts.

[0013] The end has threads on its exterior and corresponds to the oil pipe.

[0014] The beneficial technical effects of this invention are as follows:

[0015] 1. This invention provides a leakage detection sensor for a heavy water stacker loading and unloading machine. By setting an isolation diaphragm and injecting silicone oil into both the outer shell and the oil pipe, the influence of working static pressure on the measuring silicon wafer is reduced. When working static pressure is applied to the positive and negative cavities of the measuring silicon wafer, the working static pressure is balanced and applied to the measuring silicon wafer through the silicone oil in the inner cavity of the outer shell and the inner cavity of the oil pipe, achieving mutual cancellation. This results in minimal bending deformation of the measuring silicon wafer due to working static pressure, significantly improving the static pressure influence performance of the device.

[0016] 2. This invention provides a leakage detection sensor for a heavy water stack loading and unloading machine. It uses an upper concave arc-shaped limiting plate and a lower concave arc-shaped limiting plate to block and limit the movement of the measuring silicon wafer. Under conditions of excessive internal and external pressure difference, once the deformation of the measuring silicon wafer reaches a certain level, if the wafer deforms upwards, the upper concave arc-shaped limiting plate blocks and limits its movement; if the wafer deforms downwards, the lower concave arc-shaped limiting plate blocks and limits its movement. This effectively prevents the measuring silicon wafer from deforming beyond its limits and becoming irreversible, thus extending the service life of the device.

[0017] 3. The present invention provides a leakage detection sensor for a heavy water stacker loading and unloading machine, which prevents the external plug from falling off by setting up a rotating structure, an L-shaped rod, a fixing bolt, and a top block. After the external plug is connected to the socket, the L-shaped rod can be rotated by the rotating structure, and then the fixing bolt can be tightened to fix the top block on one side of the external plug, thereby fixing and limiting the external plug and effectively preventing the external plug from being pulled and separated from the socket. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a leakage detection sensor for a heavy water stacker loader provided by the present invention;

[0019] Figure 2 This is a front view of a leakage detection sensor for a heavy water stacker loader provided by the present invention;

[0020] Figure 3 This is an enlarged structural diagram of part A in a leakage detection sensor for a heavy water stacker loader provided by the present invention;

[0021] Figure 4 This is an enlarged structural diagram of part B in a leakage detection sensor for a heavy water stacker loader provided by the present invention.

[0022] In the diagram: 1-Outer shell; 101-End; 102-Fixing ring; 103-Fixing bolt; 2-Silicone oil; 3-Oil pipe; 4-Isolation diaphragm; 5-Base silicon wafer; 6-Measuring silicon wafer; 7-Upper concave arc-shaped limiting plate; 701-First mounting rod; 8-Lower concave arc-shaped limiting 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 bolt; 14-Top block. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] The present invention provides a leakage detection sensor for a heavy water stacker loading and unloading machine, comprising a housing 1, silicone oil 2, oil pipe 3, isolation diaphragm 4, base silicon wafer 5, measuring silicon wafer 6, socket 9, and external plug 10.

[0025] like Figure 1-3 As shown, an oil pipe 3 is located at the center of the inner bottom of the outer casing 1, and isolation diaphragms 4 are provided at the top of the outer casing 1 and the bottom of the oil pipe 3. The isolation diaphragms 4 are mainly used for sealing and storing the silicone oil 2. Silicone oil 2 is injected into the interior of both the outer casing 1 and the oil pipe 3, and the inner cavity of the oil pipe 3 and the inner cavity of the outer casing 1 achieve pressure balance. When working static pressure is applied to the positive and negative cavities of the measuring silicon wafer 6, the working static pressure is balanced and applied to the measuring silicon wafer 6 through the silicone oil 2 in the inner cavity of the outer casing 1 and the silicone oil 2 in the inner cavity of the oil pipe 3, and they cancel each other out. This results in minimal bending deformation of the measuring silicon wafer 6 under working static pressure, which greatly improves the static pressure effect performance of the device. An end 101 is provided at the bottom of the outer casing 1. Preferably, the end 101 has external threads, and the end 101 is screwed into the heavy water stack loading and unloading machine through the external threads, and the end 101 corresponds to the oil pipe 3. Preferably, a retaining ring 102 is welded to the bottom of the outer casing 1, and at least two sets of equidistant retaining bolts 103 are screwed onto the retaining ring 102. The retaining bolts 103 are then screwed into the heavy water stacker loading and unloading machine, thus fixing the retaining ring 102 onto the heavy water stacker loading and unloading machine, thereby reinforcing the installation of the device and ensuring its stability on the heavy water stacker loading and unloading machine. A base silicon wafer 5 is provided at the top of the oil pipe 3, and a measuring silicon wafer 6 is provided at the top of the base silicon wafer 5. The measuring silicon wafer 6 deforms under the action of the internal and external pressure difference and generates an electrical signal, which is used to measure the pressure difference change during heavy water stack loading and unloading, and then leak detection is performed based on the pressure difference change. A socket 9 is provided on the top of one side of the outer casing 1, and the socket 9 is electrically connected to the measuring silicon wafer 6 via a wire. An external plug 10 is inserted into one side of the socket 9, facilitating the insertion and connection of the external plug 10 to an external host. The external host converts the electrical signal to display the differential pressure.

[0026] In this embodiment, when the leakage detection sensor is used on the heavy water stack loading and unloading machine, the device is screwed into the heavy water stack loading and unloading machine through the external thread on the end 101. Then, the fixing bolt 103 is screwed into the heavy water stack loading and unloading machine again to reinforce the installation of the device and ensure the stability of the device installed on the heavy water stack loading and unloading machine. At this time, the measuring silicon wafer 6 deforms under the action of the internal and external pressure difference and generates an electrical signal to measure the pressure difference change during the loading and unloading of the heavy water stack. Then, the external host is connected to the socket 9 through the external plug 10. The external host converts the electrical signal to display the differential pressure. Then, the personnel use the pressure difference change to detect leakage in the heavy water stack loading and unloading machine. When working static pressure is applied to the positive and negative cavities of the measuring silicon wafer 6, the working static pressure is balanced and applied to the measuring silicon wafer 6 through the silicone oil 2 in the inner cavity of the outer shell 1 and the silicone oil 2 in the inner cavity of the oil pipe 3, and they cancel each other out. This makes the bending deformation of the measuring silicon wafer 6 under the working static pressure extremely small. This treatment greatly improves the static pressure effect performance of the device.

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

[0028] In this embodiment, when the device is in use, if the internal and external pressure difference of the measured silicon wafer 6 is large, the upper concave arc-shaped limiting plate 7 can limit and protect the upward deformation of the measured silicon wafer 6, and the lower concave arc-shaped limiting plate 8 can limit and protect the downward deformation of the measured silicon wafer 6. Therefore, it can effectively prevent the measured silicon wafer 6 from deforming beyond its limit and becoming unrecoverable, thus extending the service life of the device.

[0029] like Figure 4 As shown, an L-shaped rod 12 is rotatably mounted on one side of the outer casing 1, above and below the socket 9, via a rotating structure 11. A fixing bolt 13 is screwed onto one end of the L-shaped rod 12, and a top block 14 is rotatably mounted on the end of the fixing bolt 13 facing the socket 9 via a bearing. Preferably, a threaded hole 1201 is provided at the position corresponding to the fixing bolt 13 at one end of the L-shaped rod 12, through which the fixing bolt 13 passes, connecting to the L-shaped rod 12. Preferably, a screw block is provided at the end of the fixing bolt 13 away from the socket 9, and the surface of the screw block has anti-slip texture.

[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 outer shell 1 by welding. The rotating rod 1102 is fixedly connected to the inside of the concave frame 1101 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 has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A leakage detection sensor for a heavy water stacker loading and unloading machine, characterized in that, The detection sensor includes a housing (1), silicone oil (2), an oil pipe (3), an isolation diaphragm (4), a base silicon wafer (5), a measuring silicon wafer (6), a socket (9), and an external plug (10); the oil pipe (3) is located at the center of the bottom of the housing (1), and the isolation diaphragm (4) is located at the top of the housing (1) and the bottom of the oil pipe (3); silicone oil (2) is injected into the interior of both the housing (1) and the oil pipe (3); an end (101) is located at the bottom of the housing (1); the base silicon wafer (5) is located at the top of the oil pipe (3), and the measuring silicon wafer (6) is located at the top of the base silicon wafer (5); the housing (1) A socket (9) is provided on the top of one side of the oil pipe (3), 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). At least two sets of equidistant first mounting rods (701) are welded around the top of the oil pipe (3), and an upper concave arc-shaped limiting plate (7) is welded to the top of the first mounting rod (701), and the upper concave arc-shaped limiting plate (7) is located above the measuring silicon wafer (6). A lower concave arc-shaped limiting plate (8) is fixedly installed at the top opening of the oil pipe (3) through a second mounting rod (801), and the lower concave arc-shaped limiting plate (8) is located below the measuring silicon wafer (6).

2. The leakage detection sensor for a heavy water stacker loader / unloader according to claim 1, characterized in that, An L-shaped rod (12) is rotatably mounted on one side of the outer shell (1) above and below the socket (9) via a rotating structure (11). A top fixing bolt (13) is screwed onto one end of the L-shaped rod (12), and a top block (14) is rotatably mounted on the end of the top fixing bolt (13) facing the socket (9) via a bearing.

3. A leakage detection sensor for a heavy water stacker loader / unloader according to claim 2, characterized in that, 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 outer shell (1), and the rotating rod (1102) is fixedly connected inside the concave frame (1101). 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.

4. A leakage detection sensor for a heavy water stacker loader / unloader according to claim 2, characterized in that, The L-shaped rod (12) has a threaded hole (1201) at one end corresponding to the top fixing bolt (13). The top fixing bolt (13) passes through the threaded hole (1201) and is connected to the L-shaped rod (12) through the threaded hole (1201).

5. A leakage detection sensor for a heavy water stacker loader / unloader according to claim 2, characterized in that, The end of the top fixing bolt (13) away from the socket (9) is provided with a screw block, and the surface of the screw block is provided with anti-slip texture.

6. A leakage detection sensor for a heavy water stacker loader / unloader according to claim 1, characterized in that, A fixing ring (102) is fixedly connected to the bottom of the outer shell (1), and at least two sets of equidistant fixing bolts (103) are screwed onto the circumference of the fixing ring (102). The fixing ring (102) is fixedly installed on the heavy water stacker by means of the fixing bolts (103).

7. A leakage detection sensor for a heavy water stacker loader / unloader according to claim 1, characterized in that, The end (101) is threaded on the outside and corresponds to the oil pipe (3).

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