CN115691844A - Temperature and humidity probe for monitoring leakage of coolant in nuclear power station - Google Patents
Temperature and humidity probe for monitoring leakage of coolant in nuclear power station Download PDFInfo
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- CN115691844A CN115691844A CN202211314644.9A CN202211314644A CN115691844A CN 115691844 A CN115691844 A CN 115691844A CN 202211314644 A CN202211314644 A CN 202211314644A CN 115691844 A CN115691844 A CN 115691844A
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- probe
- temperature
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- coolant
- monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a temperature and humidity probe for monitoring leakage of a coolant in a nuclear power station, which comprises a metal protective cap, a temperature sensor, a humidity sensor, a pin assembly, a wiring pipe, a probe circuit board, a probe shell, an upper cover and a wiring pipe. The temperature and humidity sensor is mainly used for monitoring whether the coolant in the pipeline leaks or not and the leakage condition by monitoring the relative temperature and humidity change between the main pipeline and the heat insulation layer. The temperature and humidity sensor probe is arranged in a monitored environment through the mounting structure, the transmission cable transmits relative temperature and humidity signals to the signal processing module at the rear end, the signals are converted, calculated and the like through the signal processing module, and finally display data related to the leakage condition are output. The temperature and humidity sensor probe faces a complex nuclear radiation irradiation environment, can effectively monitor the leakage condition of the coolant in time, and is very necessary and critical in an auxiliary monitoring system of a nuclear power station.
Description
Technical Field
The invention belongs to the technical field of auxiliary monitoring of nuclear power stations, in particular to a temperature and humidity probe for monitoring leakage of a coolant of a nuclear power station, which is a key component of a coolant leakage monitoring system of the nuclear power station.
Background
The safe operation of the nuclear power station is guaranteed, and various auxiliary monitoring modes are provided, so that abnormal conditions can be found in time and rapid response can be made. The nuclear power station coolant leakage monitoring system mainly monitors and calculates the leakage condition of the coolant by monitoring the relative temperature and humidity changes between a main pipeline and an insulating layer, a temperature and humidity sensor probe is used as an important ring of the coolant leakage monitoring system, the temperature and humidity sensor probe is placed in a monitored environment, temperature and humidity signals collected by the probe are transmitted to a signal processing module through a transmission cable, the signals are converted, calculated and the like through the signal processing module, and finally display data related to the leakage condition are output. The digital temperature and humidity sensor probe commonly used in industry uses an integrated chip to directly output voltage or digital signals related to environmental changes, and the output signals are transmitted to a processing module through a transmission cable for further processing. The digital temperature and humidity sensor probe is an active device, is difficult to resist nuclear radiation interference and cannot be used in a nuclear radiation environment.
Disclosure of Invention
The invention aims to provide a temperature and humidity probe for monitoring leakage of a coolant in a nuclear power station, which is not influenced by nuclear radiation irradiation, is stable and reliable, and can effectively and accurately detect the change of air temperature and humidity between the outer surface of a main pipeline and the inner surface of an insulating layer.
The technical solution for realizing the purpose of the invention is as follows: a temperature and humidity probe for monitoring leakage of a coolant in a nuclear power station is arranged on a probe base on a detected pipeline and positioned at a detected position, and comprises a metal protective cap, a temperature sensor, a humidity sensor, a pin assembly, a wiring pipe, a probe circuit board, a probe shell, an upper cover and a wiring pipe; a metal protection cap is sleeved outside one end of the pin inserting assembly, a temperature sensor and a humidity sensor are arranged inside the metal protection cap, and a cable is arranged at the other end of the pin inserting assembly, inserted into the wiring pipe and fixedly connected with one end of the wiring pipe; the other end of the wiring pipe is fixedly connected with the lower end of the probe shell, an upper cover is arranged at an opening at the upper end of the probe shell, the wiring pipe, the probe shell and the upper cover form a probe inner cavity, a probe circuit board is arranged in the cavity of the probe shell and used for judging whether devices, wiring and a signal processing circuit of the temperature sensor and the humidity sensor are abnormal or not and transmitting detected temperature and humidity signals to an external signal processing module; the side wall of the probe shell is provided with a wire outlet pipe used for placing a transmission cable between the probe and an external signal processing module of the probe; when the probe works, the metal protective cap, the internal temperature sensor and the internal humidity sensor are completely arranged in a monitoring environment.
Further, the temperature sensor and the humidity sensor respectively adopt a thermistor and a humidity sensitive capacitor.
And when the probe is in a self-checking state, the signal processing module supplies power to the micro relay, the micro relay is closed, the temperature and humidity sensor is switched to the nominal reference resistor and reference capacitor on the circuit board, and whether the device, the wiring and the signal processing circuit of the temperature and humidity sensor are abnormal is judged by reading the values of the reference resistor and the reference capacitor.
Further, the contact pin assembly comprises a gold-plated contact pin, a glass bead and a contact pin shell, the gold-plated contact pin is installed inside the contact pin shell through the glass bead to form a whole, the gold-plated contact pin is insulated from the contact pin shell, one end of the gold-plated contact pin is provided with a temperature sensor and a humidity sensor, and the other end of the gold-plated contact pin is connected with a cable connected with the probe circuit board.
Furthermore, a cable protection tube stabilizing block, a cable locking nut and a cable protection tube are arranged in the wire outlet tube, a metal corrugated tube is arranged in the cable protection tube, and a layer of heat-shrinkable sleeve is arranged outside the cable protection tube; the transmission cable between the probe and the external signal processing module is arranged in the cable protection pipe, the cable protection pipe stabilizing block is fixed with the metal corrugated pipe of the cable protection pipe, the cable protection pipe locking nut and the probe shell are installed and fixed in a threaded mode, and the cable stabilizing block is limited in the wire outlet pipe of the probe shell after the threads are screwed to fix the transmission cable protection pipe.
Furthermore, the probe is installed on a probe base on the detected pipeline through a probe mounting nut sleeved outside the wiring pipe.
Furthermore, the probe also comprises a nut limiting ring sleeved outside the wiring pipe and used for limiting the mounting nut of the probe.
Further, a sealing structural adhesive is filled and sealed in the probe inner cavity.
Further, the shell side face and the head part of the metal protection cap are provided with a plurality of windows.
Furthermore, the metal protection cap is cylindrical, and windows on the side surface of the shell are uniformly distributed along the cylindrical surface.
Compared with the prior art, the invention has the following remarkable advantages:
1) The invention has simple structural design, reliable mechanical structural strength of the probe and convenient and stable installation form of the probe installation nut and the installation base.
2) The windowing on the metal protective cap enables the environment where the probe sensor is located to be consistent with the detected environment in real time, and the temperature and humidity signals monitored by the probe are timely and effective.
3) The thermistor and the humidity-sensitive capacitor used in the invention are passive devices, are not influenced by nuclear radiation irradiation, can normally work in a nuclear radiation environment, are stable and reliable, can effectively monitor the leakage condition of the coolant in time, and are necessary and critical in an auxiliary monitoring system of a nuclear power station.
4) In the process of transmitting the humidity-sensitive capacitor signals, the capacitors can be interfered by electromagnetic interference to generate interference on the signals.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
Fig. 1 is an overall sectional view of the present invention.
Fig. 2 is a partial cross-sectional view of the moisture-sensitive resistor and the heat-sensitive capacitor inside the metal cap.
FIG. 3 is a schematic view of the vertical installation of the present invention
Fig. 4 is a schematic view of the horizontal installation form of the present invention.
The reference numbers in the figure, 1-metal protection cap, 2-thermistor, 3-pin component, 4-wiring tube, 5-nut spacing ring, 6-probe mounting nut, 7-probe shell, 8-probe circuit board, 9-upper cover, 10-cable protection tube stabilizing block, 11-transmission cable, 12-cable protection tube, 13-cable locking nut, 14-sealing structure glue, 15-humidity sensitive capacitor; 101-metal cap fenestration, 102-glass bead, 103-pin assembly housing, 104-gold plated pin, 105-internal trace.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It should be noted that, if directional indications (such as upper, lower, left, right, front, rear, 8230; \8230;) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components in a specific posture (as shown in the figure), the motion situation, etc., and if the specific posture is changed, the directional indications are correspondingly changed.
In one embodiment, referring to fig. 1, a temperature and humidity probe for monitoring coolant leakage in a nuclear power plant is provided, where the probe is mounted on a probe base on a pipeline to be detected, and located at a detected position, and includes a metal protection cap 1, a thermistor 2, a humidity sensitive capacitor 15, a pin assembly, a wiring pipe 4, a probe circuit board 8, a probe housing 7, an upper cover 9, and a wiring pipe; a metal protective cap is sleeved outside one end of the pin insertion assembly, a thermistor and a humidity sensitive capacitor are arranged inside the metal protective cap, and a cable is arranged at the other end of the metal protective cap, inserted into the wiring pipe and fixedly connected with one end of the wiring pipe; the other end of the wiring pipe is fixedly connected with the lower end of the probe shell, an upper cover is arranged at an opening at the upper end of the probe shell, the wiring pipe, the probe shell and the upper cover form a probe inner cavity, a probe circuit board is arranged in the cavity of the probe shell and used for judging whether devices, wiring and a signal processing circuit of the thermistor and the humidity-sensitive capacitor are abnormal or not and transmitting detected temperature and humidity signals to an external signal processing module; the side wall of the probe shell is provided with a wire outlet pipe used for placing a transmission cable between the probe and an external signal processing module of the probe; when the probe works, the metal protective cap, the thermistor and the humidity sensitive capacitor are completely arranged in a monitoring environment. And the probe inner cavity formed by the wiring pipe 4, the probe shell 7 and the upper cover 9 is used for encapsulating and protecting the sealing structure glue 14.
The probe is arranged on a probe base on a detected pipeline through a probe mounting nut 6 sleeved outside the wiring pipe.
The probe also comprises a nut limiting ring 5 sleeved outside the wiring pipe and used for limiting the probe mounting nut 6.
The probe inner cavity formed by the wiring pipe 4, the probe shell 7 and the upper cover 9 is used for encapsulating and protecting the sealing structure glue 14.
Further, in one embodiment, referring to fig. 1 and 2, the pin assembly 3 includes a gold-plated pin 104, a glass bead 102 and a pin housing 103, the glass bead 102 is formed by sintering the gold-plated pin 104 and the pin housing 103 at a high temperature to form a whole, and the pin is insulated from the housing. One end of the pin housing 103 is provided with an external thread for mounting the metal protection cap 1, and the other end is inserted into the routing tube 4 and fixed with the routing tube 4 by brazing. One side of the gold-plated pin 104 is soldered to the thermistor 2 and the humidity-sensitive capacitor 15, and the other side is soldered to a wiring harness 105 connected to the circuit board.
Further, in one embodiment, with reference to fig. 1 and 2, the metal protection cap 1 is provided with internal threads to be assembled with the pin assembly housing 103, the thermistor 2 and the humidity-sensitive capacitor 15 are disposed in an inner cavity of the metal protection cap 1, a plurality of windows 101 are left in the side surface and the head of the housing of the metal protection cap 1, and the reserved windows 101 ensure that the environment where the thermistor 2 and the humidity-sensitive capacitor 15 are located is consistent with the monitored environment.
Preferably, the metal protection cap is cylindrical, and the windows on the side surface of the shell are uniformly distributed along the cylindrical surface.
Further, in one embodiment, one end of the wiring tube 4 is fixed to the probe housing 7, the other end of the wiring tube is fixed to the pin housing 103, the nut limiting ring 5 is fixed to the outer diameter of the wiring tube 4, and the fixing modes are all hard soldering. The probe mounting nut 6 is sleeved outside the wiring pipe, and the probe mounting nut 6 is mounted with a probe base on the detected pipeline through external threads; the wire harness 105 inside the probe passes through the wiring tube 4 to be connected with the circuit board 8, and the wire harness 105 and the circuit board 8 are fixed by soldering.
Further, in one embodiment, the probe housing 7 and the upper cover 9 are installed by internal and external threads, the probe circuit board 8 is fixed in the cavity of the probe housing 7 by using screws, and the probe circuit board 8 includes a reference resistor, a reference capacitor and a micro relay for switching the self-checking function. When the temperature and humidity sensor is in a self-checking state, the signal processing module supplies power to the micro relay, the micro relay is closed, the thermistor and the humidity sensitive capacitor are switched to the nominal reference resistor and reference capacitor on the circuit board, and the values of the reference resistor and the reference capacitor are read to judge whether devices, wiring and a signal processing circuit of the temperature and humidity sensor are abnormal.
Further, in one embodiment, the transmission cable 11 adopts a shielded cable to prevent signal interference; the cable protection tube 12 has a protection effect on the remote transmission cable, the inside of the cable protection tube is a metal corrugated tube, and the outside of the cable protection tube is a layer of heat-shrinkable sleeve; the cable protection tube stabilizing block 10 is fixed with the metal corrugated tube of the cable protection tube 12 in a brazing mode, the cable protection tube locking nut 13 is fixed with the probe shell 7 in a threaded mode, and the cable stabilizing block 10 is limited in the wire outlet tube of the probe shell 7 after the threads are screwed tightly, so that the cable protection tube 12 is fixed.
When the invention is used, the mounting nut 6 is screwed into the pillar of the mounting base on the monitoring point by combining the figures 3 and 4, the mounting pillar is fixed with the monitored pipeline through a clapboard, a lining plate, a mounting flange and the like on the mounting base, and thus the whole probe is fixed at the detected position. The metal protective cap 1, the thermistor 2 and the humidity-sensitive capacitor 15 inside the metal protective cap are arranged in a monitoring environment, so that the thermistor 2 and the humidity-sensitive capacitor 15 can sense the change of the monitoring environment in real time, the humidity-sensitive capacitor 2 is used as a sensitive element to measure relative humidity, and the thermistor 15 is used to measure relative temperature. And a standard resistor and a standard capacitor are arranged in the probe circuit board 8 and are mainly used for periodic self-checking and testing of the channel. When the coolant leaks, the air temperature and the air humidity between the outer surface of the monitored main pipeline and the inner surface of the heat insulation layer change, the resistance value and the capacitance value output by the probe correspondingly change, the signal processing module in the leakage monitoring system is used for carrying out signal conversion, filtering and amplification processing on the remote probe, and finally, a related voltage signal is output to calculate and detect the coolant leakage.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions are only illustrative of the principles of the invention, and any modifications, equivalent substitutions, improvements and the like within the spirit and principle of the invention should be included within the scope of the invention without departing from the spirit and scope of the invention.
Claims (10)
1. A temperature and humidity probe for monitoring leakage of a coolant in a nuclear power station is characterized in that the probe is arranged on a probe base on a detected pipeline and is positioned at a detected position, and the temperature and humidity probe comprises a metal protective cap, a temperature sensor, a humidity sensor, a pin assembly, a wiring pipe, a probe circuit board, a probe shell, an upper cover and a wiring pipe; a metal protective cap is sleeved outside one end of the pin insertion assembly, a temperature sensor and a humidity sensor are arranged inside the metal protective cap, and a cable is arranged at the other end of the metal protective cap, inserted into the wiring pipe and fixedly connected with one end of the wiring pipe; the other end of the wiring pipe is fixedly connected with the lower end of the probe shell, an upper cover is arranged at an opening at the upper end of the probe shell, the wiring pipe, the probe shell and the upper cover form a probe inner cavity, a probe circuit board is arranged in the cavity of the probe shell and used for judging whether devices, wiring and a signal processing circuit of the temperature sensor and the humidity sensor are abnormal or not and transmitting detected temperature and humidity signals to an external signal processing module; the side wall of the probe shell is provided with a wire outlet pipe used for placing a transmission cable between the probe and an external signal processing module of the probe; when the probe works, the metal protective cap, the internal temperature sensor and the internal humidity sensor are completely arranged in a monitoring environment.
2. The temperature and humidity probe for monitoring leakage of coolant from nuclear power plant as claimed in claim 1, wherein the temperature sensor and the humidity sensor are respectively a thermistor and a humidity-sensitive capacitor.
3. The temperature and humidity probe for monitoring the leakage of the coolant in the nuclear power plant as recited in claim 2, wherein the probe circuit board comprises a reference resistor, a reference capacitor and a micro relay, and is used for realizing the switching of the self-checking function, when the probe is in the self-checking state, the signal processing module supplies power to the micro relay, the micro relay is closed, the temperature and humidity sensor is switched to the nominal reference resistor and reference capacitor on the circuit board, and whether the devices, the wiring and the signal processing circuit of the temperature and humidity sensor are abnormal is judged by reading the values of the reference resistor and the reference capacitor.
4. The temperature and humidity probe for monitoring the leakage of the coolant in the nuclear power plant as claimed in claim 1, wherein the pin assembly includes a gold-plated pin, a glass bead and a pin housing, the gold-plated pin is mounted inside the pin housing through the glass bead to form a whole, the gold-plated pin is insulated from the pin housing, one end of the gold-plated pin is provided with a temperature sensor and a humidity sensor, and the other end of the gold-plated pin is connected to a cable connected to the probe circuit board.
5. The temperature and humidity probe for monitoring the leakage of the coolant in the nuclear power plant as claimed in claim 1, wherein a cable protection tube stabilizing block, a cable locking nut and a cable protection tube are arranged in the outlet tube, a metal corrugated tube is arranged in the cable protection tube, and a layer of heat-shrinkable sleeve is arranged outside the cable protection tube; the transmission cable between the probe and the external signal processing module is arranged in a cable protection pipe, a cable protection pipe stabilizing block is fixed with a metal corrugated pipe of the cable protection pipe, a cable protection pipe locking nut is fixedly installed with the probe shell in a threaded mode, and the cable stabilizing block is limited in a wire outlet pipe of the probe shell after the threads are screwed tightly to fix the transmission cable protection pipe.
6. The temperature and humidity probe for monitoring the leakage of the coolant in the nuclear power plant as recited in claim 1, wherein the probe is mounted on a probe base on the pipeline to be tested by a probe mounting nut which is sleeved outside the wiring pipe.
7. The temperature and humidity probe for monitoring the leakage of the coolant in the nuclear power plant as recited in claim 6, further comprising a nut limiting ring sleeved outside the wiring pipe for limiting a mounting nut of the probe.
8. The temperature and humidity probe for monitoring leakage of coolant in nuclear power plant according to claim 1, wherein a sealing structure adhesive is filled and sealed in the probe inner cavity.
9. The temperature and humidity probe for nuclear power plant coolant leakage monitoring of claim 1, wherein the shell side and the head of the metal protective cap are provided with a plurality of windows.
10. The temperature and humidity probe for monitoring leakage of coolant in nuclear power plant as claimed in claim 9, wherein the metal protection cap is cylindrical, and the windows on the side surface of the shell are uniformly distributed along the cylindrical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211314644.9A CN115691844A (en) | 2022-10-26 | 2022-10-26 | Temperature and humidity probe for monitoring leakage of coolant in nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211314644.9A CN115691844A (en) | 2022-10-26 | 2022-10-26 | Temperature and humidity probe for monitoring leakage of coolant in nuclear power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115691844A true CN115691844A (en) | 2023-02-03 |
Family
ID=85098545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211314644.9A Pending CN115691844A (en) | 2022-10-26 | 2022-10-26 | Temperature and humidity probe for monitoring leakage of coolant in nuclear power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115691844A (en) |
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2022
- 2022-10-26 CN CN202211314644.9A patent/CN115691844A/en active Pending
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