Reactor pit liquid level monitoring device and reactor pit water injection system

Abstract

The utility model discloses a reactor pit liquid level monitoring device and a reactor pit water injection system, the reactor pit liquid level monitoring device comprises a communicating pipe and a measuring assembly, and at least part of the communicating pipe is used for being pre-buried in a concrete structure on the outer side of a reactor pit; the communicating pipe is provided with a first end and a second end, the first end is used for communicating with the bottom of the pile pit, and the second end is exposed out of the top surface of the concrete structure and communicates with the external environment; the communicating pipe comprises a connecting part arranged at the second end; the measuring assembly comprises a mounting part and a liquid level detection unit; the mounting part is exposed out of the second end and is detachably connected with the connecting part; and the liquid level detection unit is connected with the mounting piece, extends into the communicating pipe and is used for measuring the liquid level in the communicating pipe. According to the utility model, the liquid in the reactor pit is drained into the communicating pipe for measurement, and the reactor pit liquid level measuring device is suitable for reactor pit liquid level measurement of a compact small reactor nuclear power station. And the influence of a high-temperature and high-pressure environment on a detection result is avoided, so that the accuracy of the detection result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power equipment detection, in particular to a stack pit liquid level monitoring device and a stack pit water injection system. Background Art

[0002] When an accident occurs in a nuclear power plant, in order to avoid a meltdown, water needs to be injected into the reactor pit through a water injection pipeline. At this time, the height of the water level in the reactor pit needs to be measured.

[0003] In the prior art, reactor pit water level measurement in large commercial pressurized water reactor (PWR) nuclear power plants typically uses a differential pressure level gauge with a side opening. This is not suitable for compact, concrete-enclosed smaller reactor plants. This differential pressure level gauge measures the liquid level within the pit by measuring the pressure difference between two pipes connected to the pit, making it difficult to perform maintenance and calibration to ensure accurate measurement results. Furthermore, in the event of a nuclear power plant accident, high temperatures and high pressures are likely to affect the measurement results of the differential pressure level gauge. Utility Model Content

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, it proposes a reactor pit liquid level monitoring device that can indirectly measure the liquid level in the reactor pit by detecting the liquid level in a connecting pipe through a detachable detection component. The device is suitable for use in small-scale nuclear power plants. Liquid level monitoring is decoupled from pressure and facilitates disassembly, maintenance, and calibration, thereby improving the accuracy of detection results.

[0005] The utility model also provides a heap pit water injection system with the above-mentioned heap pit liquid level monitoring device.

[0006] According to the first aspect of the present utility model, the heap pit liquid level monitoring device includes: a connecting pipe, at least part of which is used to be pre-buried in a concrete structure outside the heap pit; the connecting pipe has a first end and a second end, the first end is used to communicate with the bottom of the heap pit, and the second end is exposed from the concrete structure and communicates with the external environment; the connecting pipe includes a connecting portion provided at the second end; a measuring assembly, the measuring assembly includes a mounting piece and a liquid level detection unit, the mounting piece is detachably connected to the connecting portion; the liquid level detection unit is connected to the mounting piece, the liquid level detection unit extends into the connecting pipe, and the liquid level detection unit is used to measure the liquid level in the connecting pipe.

[0007] The reactor pit liquid level monitoring device according to the embodiment of the utility model has at least the following beneficial effects: by pre-embedding a connecting pipe in the concrete around the reactor pit, the liquid in the reactor pit is drained into the connecting pipe for measurement using the connecting vessel principle. This solves the problem that the reactor pit of a compact small-scale nuclear power plant is compact and cannot be installed with a conventional differential pressure liquid level transmitter for measurement. Furthermore, the liquid level detection results are decoupled from the pressure, avoiding the influence of the high temperature and high pressure environment on the detection results. The measuring component and the second end of the connecting pipe are connected in a detachable manner, which facilitates the staff to regularly disassemble the measuring component for calibration and maintenance, thereby improving the accuracy of the detection results.

[0008] According to some embodiments of the present invention, the heap pit liquid level monitoring device further includes an elastic abutment, which is connected to the outer side wall of the measuring assembly and abuts against the inner wall of the connecting pipe.

[0009] According to some embodiments of the present invention, there are multiple elastic abutting members, and the multiple elastic abutting members are arranged at intervals along the outer side wall of the measuring component.

[0010] According to some embodiments of the present invention, the elastic abutment member includes a guide cylinder, an elastic member and a ball, the guide cylinder is connected to the outer wall of the measuring component; the elastic member is arranged in the guide cylinder, and the elastic member is connected between the outer wall of the measuring component and the ball; part of the structure of the ball is exposed from one end of the guide cylinder away from the measuring component to abut against the inner wall of the connecting tube.

[0011] According to some embodiments of the present invention, the connecting portion includes a first flange; the mounting member includes a second flange, and the second flange is detachably connected to the first flange via a fastener.

[0012] According to some embodiments of the present invention, along the direction from the first end to the second end, the connecting pipe includes a first pipe and a second pipe; the second pipe is vertically arranged, and the measuring component extends into the second pipe; the first pipe is used to connect the second pipe with the bottom of the pit.

[0013] According to some embodiments of the present invention, along an extension direction perpendicular to the first pipeline, a cross section of the first pipeline is no higher than a communication position between the first pipeline and the stacking pit.

[0014] According to some embodiments of the present invention, the mounting member further includes a sleeve, and the liquid level detection unit includes a plurality of electric contact liquid level gauges, wherein the sensing ends of the plurality of electric contact liquid level gauges are disposed in the sleeve and arranged at preset intervals along the axial direction of the sleeve; the sensing ends of the electric contact liquid level gauges are used to contact the liquid in the connecting pipe to measure the liquid level in the connecting pipe.

[0015] According to some embodiments of the present invention, the pile pit liquid level monitoring device also includes a plurality of warning parts, and the plurality of warning parts are connected to the measurement circuit in a one-to-one correspondence with the plurality of electric contact liquid level gauges; the electric contact liquid level gauge is configured to conduct the corresponding measurement circuit when the sensing end contacts the liquid in the connecting pipe, so that the corresponding warning part sends a warning message.

[0016] According to the second embodiment of the present invention, the heap pit water injection system includes the heap pit liquid level monitoring device as described in the first embodiment.

[0017] The reactor pit water injection system according to the embodiment of the present invention has at least the following beneficial effects: by improving the accuracy of liquid level detection through the reactor pit liquid level monitoring device, the reactor pit water injection system can more accurately control the liquid level in the reactor pit, thereby optimizing the cooling and stable operation of the reactor.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic structural diagram of a heap pit water injection system in an embodiment of the present utility model;

[0021] Figure 2 This is a schematic structural diagram of a heap pit liquid level monitoring device in an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the assembly relationship of the elastic abutment member, the measuring assembly and the connecting pipe according to an embodiment of the present utility model;

[0023] Figure 4 Schematic diagram of the connection relationship between the liquid level detection unit and the warning member in an embodiment of the present utility model.

[0024] Reference numerals:

[0025] 1000. Heap pit water injection system; 100. Heap pit liquid level monitoring device; 10. Connecting pipe; 11. Connecting part; 12. First pipeline; 13. Second pipeline; 20. Measuring assembly; 21. Mounting part; 211. Second flange; 212. Sleeve; 22. Liquid level detection unit; 221. Electric contact liquid level gauge; 2211. Sensing end; 30. Elastic abutment; 31. Guide cylinder; 32. Elastic part; 33. Ball bearing; 40. Warning part; 200. Heap pit; 300. Concrete structure. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0031] In a first aspect, the utility model provides a heap pit liquid level monitoring device capable of monitoring the liquid level in the heap pit.

[0032] In some embodiments, as Figure 1 and Figure 2As shown, the stack pit liquid level monitoring device 100 includes a connecting pipe 10 and a measuring assembly 20. The connecting pipe 10 communicates with the stack pit 200. Utilizing the principle of a communicating vessel, the liquid level within the stack pit 200 is converted to the liquid level within the connecting pipe 10, facilitating external measurement. The measuring assembly 20 can extend into the connecting pipe 10, contacting the liquid within the connecting pipe 10 to measure the liquid level therein. By measuring the liquid level within the connecting pipe 10, the liquid level within the stack pit 200 is indirectly measured.

[0033] Part of the structure of the connecting pipe 10 is pre-buried in the concrete structure 300. The two ends of the connecting pipe 10 are defined as the first end and the second end respectively. The first end of the connecting pipe 10 is connected to the bottom of the pile pit 200, and the second end is exposed from the concrete structure 300 and connected to the external environment. The connecting pipe 10 is a pipeline structure as a whole and a connecting portion 11 is formed at the second end. The second end of the connecting pipe 10 is usually exposed from the surface of the concrete structure 300, so that the connecting portion 11 is located inside the factory building.

[0034] The measurement assembly 20 includes a mounting member 21 and a liquid level detection unit 22. The mounting member 21 is detachably connected to the connecting portion 11, allowing for easy installation and removal of the measurement assembly 20, facilitating calibration and maintenance. The liquid level detection unit 22 is connected to the mounting member 21 and extends from the second end into the connecting pipe 10 to detect the liquid level within the connecting pipe 10, thereby indirectly measuring the liquid level within the heap pit 200.

[0035] In this embodiment, a connecting pipe 10 is pre-buried in the concrete surrounding the reactor pit 200, and the principle of a connecting vessel is utilized to drain the liquid in the reactor pit 200 into the connecting pipe 10 for measurement. There is no need to install a conventional differential pressure level transmitter for measurement, nor is there a need to create two horizontal channels through the concrete structure 300 that extend to the reactor pit. This solves the problem that conventional differential pressure level detectors are unsuitable for use in the reactor pit 200 of compact small-reactor nuclear power plants. Furthermore, the liquid level detection results are decoupled from the pressure, preventing the impact of high-temperature and high-pressure environments on the detection results. The measuring assembly 20 and the second end of the connecting pipe 10 are detachably connected, making it easy for personnel to regularly disassemble the measuring assembly 20 for calibration and maintenance, thereby further improving the accuracy of the detection results.

[0036] like Figure 1 and Figure 2 As shown, the connecting portion 11 may include a first flange, which is provided at the second end of the connecting pipe 10 . The first flange is used to connect to the mounting member 21 of the measuring assembly 20 to improve the stability and reliability of the connection.

[0037] The top of the first flange forms a mounting surface, the radial dimension of which is greater than the wall thickness of the rest of the connecting pipe 10 , thereby increasing the contact area with the measuring assembly 20 and enhancing the stability and reliability of the connection between the mounting piece 21 and the connecting portion 11 .

[0038] Connecting pipe 10 can include a pipe and a first flange, which can be connected to the top surface of the pipe. In this case, the first flange serves as the second end of the connecting pipe 10. The first flange needs to have an axially extending relief hole, which is axially aligned with the top end of the pipe to facilitate the insertion of the measuring assembly 20 into the connecting pipe 10 through the relief hole and the second end.

[0039] The first flange can also be connected to the side wall of the second end of the pipe. In this case, the bottom end of the pipe is the first end of the entire connecting pipe 10, and the top end of the pipe is the second end of the entire connecting pipe 10. The first flange is an annular structure, and the measuring component 20 can be directly extended into the connecting pipe 10 from the port at the second end.

[0040] The first flange and the pipeline can be fixed by welding, thread connection, etc. In this embodiment, there is no limitation on the connection method between the first flange and the pipeline.

[0041] The connecting portion 11 may also be a threaded, snap-fit ​​structure formed on the second end of the connecting pipe 10 ; correspondingly, the mounting member 21 may be threadedly or snap-fitted to the connecting portion 11 , which is not limited in this embodiment.

[0042] Along the direction from the first end to the second end, the connecting pipe 10 includes a first pipe 12 and a second pipe 13. One end of the first pipe 12 is connected to one end of the second pipe 13. The other end of the first pipe 12 is usually at a lower position and is connected to the bottom of the pit 200, forming the first end of the connecting pipe 10; the other end of the second pipe 13 is exposed on the top surface of the concrete structure 300, forming the second end of the connecting pipe 10.

[0043] In other embodiments, the connecting pipe 10 may further include other structures, such as an elbow, a connector, etc., so as to connect the first pipe 12 and the second pipe 13 or distribute liquid, which is not limited in this embodiment.

[0044] In this embodiment, description is made by taking an example in which a pipeline includes a first pipeline 12 and a second pipeline 13 that are connected to each other.

[0045] The second pipe 13 is arranged vertically, and the measuring assembly 20 extends into the second pipe 13. The vertical arrangement of the second pipe 13 provides a more direct access path for the measuring assembly 20. The measuring assembly 20 can more easily extend into the interior of the connecting pipe 10 to monitor the liquid level in the connecting pipe 10 in real time.

[0046] When the second pipe 13 is arranged vertically, the flow of the liquid in the second pipe 13 will be affected by gravity, which is conducive to the liquid maintaining a stable flow state in the second pipe 13, reducing eddies and turbulence caused by uneven flow, and facilitating more accurate measurement by the measuring component 20.

[0047] Along the extension direction perpendicular to the first pipe 12, the cross-section of the first pipe 12 is no higher than the connection position between the first pipe 12 and the storage pit 200; that is, the bottom edge of the first pipe 12 is no higher than the bottom of the storage pit 200. In this case, even if the liquid level in the storage pit 200 is low, when the liquid level in the storage pit 200 rises or falls, the liquid level in the second pipe 13 will also rise or fall accordingly. This synchronization mechanism ensures that the liquid level in the connecting pipe 10 can truly reflect the liquid level in the storage pit 200.

[0048] The first pipe 12 can be arranged horizontally. This arrangement facilitates installation and commissioning, and also helps to reduce the resistance to the flow of liquid in the first pipe 12 .

[0049] The first pipe 12 may also have a curved structure, perhaps in the form of an L, U, or other complex shape. The top of the curved structure should not be higher than the bottom of the pit 200 to ensure the accuracy of the liquid level synchronization mechanism. The curved first pipe 12 can accommodate applications where the pit 200 is irregularly shaped or space is limited. By properly designing the bend angle and position, the smooth flow of liquid in the pipe can be ensured, while reducing the impact of liquid on the pipe wall.

[0050] The bottom of the first pipe 12 may have a concave portion, and impurities or particles in the liquid are deposited at the bottom of the pipe under the action of gravity, reducing the direct impact and wear of the liquid on the measuring component 20, thereby reducing interference with the measuring component 20, extending the service life of the measuring component 20, and improving its measurement accuracy.

[0051] In practical applications, it is necessary to regularly clean the impurities or particles deposited in the concave portion to ensure smooth flow of the liquid in the connecting tube 10 and normal operation of the measuring component 20 .

[0052] In some embodiments, the connecting pipe 10 includes a horizontally arranged first pipe 12 and a vertically arranged second pipe 13. The left end of the first pipe 12 is connected to the pile pit 200, and the bottom wall of the first pipe 12 is flush with or lower than the bottom of the pile pit 200. The right end of the first pipe 12 is connected to the bottom end of the second pipe 13. The top end of the second pipe 13 is exposed on the top surface of the concrete structure 300 and is provided with a first flange.

[0053] In other embodiments, the connecting pipe 10 includes a first pipe 12 with a bent structure and a vertically arranged second pipe 13. The first pipe 12 includes a horizontal section, the height of the horizontal section is lower than the bottom of the pit 200, the first pipe 12 also includes an inclined section or a vertical section connecting the left end of the horizontal section with the bottom of the pit 200, the right end of the horizontal section is connected to the bottom end of the second pipe 13, the top end of the second pipe 13 is exposed on the top surface of the concrete structure 300, and is provided with a first flange.

[0054] Part of the structure of the connecting pipe 10 is pre-buried in the concrete structure 300 , that is, before filling with concrete, the connecting pipe 10 is pre-fixed so that the connecting pipe 10 is connected to the bottom of the pit 200 and the second pipe 13 is kept vertical.

[0055] The connecting pipe 10 can be an integrated structure. The integrated connecting pipe 10 has no joints or connection points, has strong integrity, and is more stable in structure. The connecting pipe 10 can also be formed by splicing the first pipe 12 and the second pipe 13. It can be customized according to the shape and space size of the pit 200 and has high flexibility. This embodiment does not limit this.

[0056] The connecting pipe 10 may be a round pipe with an inner diameter of 5 cm, which can reduce the impact on the concrete structure 300 while ensuring smooth flow of liquid.

[0057] It is understood that the diameter of the connecting pipe 10 can also be set to 5.5 cm, 6 cm, etc. A larger inner diameter helps reduce the resistance of the liquid in the pipe, improving the efficiency and stability of the liquid flow. The diameter of the connecting pipe 10 can be selected by taking into account both the liquid flow requirements and the size of the concrete structure 300, ensuring that the connecting pipe 10 meets the liquid flow requirements while not adversely affecting the concrete structure 300.

[0058] like Figures 1 to 3 As shown, the measuring assembly 20 includes a mounting member 21, a liquid level detection unit 22, and an elastic abutment 30. The elastic abutment 30 is connected to the outer wall of the measuring assembly 20 and abuts the inner wall of the connecting tube 10. The elastic abutment 30 provides auxiliary support for the measuring assembly 20. Specifically, the mounting member 21 and the connecting portion 11 form a first support point, and the elastic abutment 30 and the inner wall of the connecting tube 10 form a second support point. These two support points jointly support the measuring assembly 20, distributing the load on the measuring assembly 20 and improving its stability. Furthermore, the elastic abutment 30 can significantly improve the vibration and shock absorption capabilities of the measuring assembly 20, reducing errors caused by vibration or impact.

[0059] Specifically, the measuring assembly 20 may be disturbed by various factors such as liquid flow, temperature change, or external vibration. Due to its elasticity and toughness, the elastic abutment member 30 can effectively absorb and disperse these disturbing forces, thereby maintaining the stability of the measuring assembly 20.

[0060] There are multiple elastic abutment members 30, which are spaced apart along the outer wall of the measuring assembly 20. The multiple support points spaced circumferentially provide a centering effect, ensuring that the measuring assembly 20 maintains the correct position within the connecting tube 10, avoiding measurement errors caused by deviation or tilt.

[0061] When the measuring assembly 20 extends into the vertical second pipe 13, the elastic abutment 30 not only provides necessary support for the measuring assembly 20 but also serves as a guide. The elastic abutment 30 maintains close contact with the inner wall of the second pipe 13, preventing the measuring assembly 20 from deflecting or tilting vertically. This guiding effect helps the measuring assembly 20 maintain a vertical posture, facilitating height calibration and enabling accurate measurements.

[0062] As previously discussed, the connecting tube 10 can have a diameter of 5 cm and a length of several meters. In other words, the connecting tube 10 is a slender pipe, and the measuring assembly 20 is also slender. Therefore, multiple sets of elastic abutment members 30 spaced vertically can be provided. Each set of elastic abutment members 30 includes multiple elastic abutment members 30 spaced along the outer wall of the measuring assembly 20, forming a more stable support system. Multiple sets of elastic abutment members 30 provide multiple support points in the vertical direction, further distributing the load on the measuring assembly 20 and preventing deformation due to its excessive length.

[0063] In some embodiments, as Figure 1 and Figure 3 The elastic abutment member 30 shown includes a guide cylinder 31, an elastic member 32, and a ball 33. The guide cylinder 31 is connected to the outer wall of the measuring assembly 20, and the elastic member 32 is disposed within the guide cylinder 31. The elastic member 32 is connected between the outer wall of the measuring assembly 20 and the ball 33. Part of the structure of the ball 33 is exposed from the end of the guide cylinder 31 away from the measuring assembly 20. The elastic member 32 provides the necessary elastic force, allowing the ball 33 to tightly abut the inner wall of the connecting pipe 10. The guide cylinder 31, elastic member 32, and ball 33 cooperate to ensure the stability of the measuring assembly 20 while also providing a certain degree of flexibility. This allows the measuring assembly 20 to maintain a vertical posture in the second pipe 13 while being able to cope with external interference and pipe changes.

[0064] The guide cylinder 31 serves as a connection and guide, ensuring that the elastic member 32 and the ball 33 are properly installed on the measuring assembly 20 and guiding the ball 33 to contact the inner wall of the connecting tube 10. The guide cylinder 31 also provides a certain degree of protection for the elastic member 32, preventing it from being directly exposed to the inside of the connecting tube 10.

[0065] The balls 33 abut the inner wall of the connecting pipe 10, achieving rolling contact. This allows the measuring assembly 20 to move more smoothly within the vertical second pipe 13 when the measuring assembly 20 is installed. The rolling contact of the balls 33 also better adapts to changes in the pipe's inner diameter, ensuring close contact and uniform support between the measuring assembly 20 and the pipe's inner wall.

[0066] The elastic force of the elastic member 32 can also play a role of buffering and shock absorption, reducing the impact of external vibration or impact on the measuring component 20. The elastic member 32 can be a spring.

[0067] To prevent ball 33 from dislodging, the end of guide cylinder 31 should be smaller than the radial dimension of ball 33, thereby limiting the travel of ball 33. It should be noted that when ball 33 is stopped by the end of guide cylinder 31, the maximum distance between ball 33 and the axis of measuring assembly 20 is greater than the inner diameter of connecting tube 10. When ball 33 is fully contained within guide cylinder 31, the maximum distance between the end of guide cylinder 31 and the axis of measuring assembly 20 is less than the inner diameter of connecting tube 10. This allows measuring assembly 20 to smoothly extend into connecting tube 10, and the elastic member 32 is compressed, providing a holding force for ball 33 against the inner wall of connecting tube 10.

[0068] In other embodiments, the elastic abutment 30 can be an integral structure, that is, the elastic abutment 30 includes a mounting seat, which is sleeved on the outer wall of the measuring component 20; the mounting seat has multiple mounting channels, and the elastic member 32 is provided in the mounting channel, and the two ends of the elastic member 32 respectively abut the bottom wall of the mounting channel and the ball 33, thereby realizing multiple support points spaced circumferentially, and this application does not limit this.

[0069] In other embodiments, the elastic abutment 30 may also be connected to the inner wall of the connecting tube 10 and abut against the outer wall of the measuring assembly 20 , which is not limited in the present application.

[0070] Mounting member 21 includes a sleeve 212 and a second flange 211. Second flange 211 is connected to one end of sleeve 212. Liquid level detection unit 22 is disposed within sleeve 212, which protects the internal liquid level detection unit 22. Second flange 211 is located outside the second end of connecting tube 10 and is detachably connected to the first flange via fasteners.

[0071] Similar to the first flange, the second flange 211 can be connected to the top of the sleeve 212. The second flange 211 can be connected to the outer wall of the sleeve 212 near the top. The second flange 211 and the sleeve 212 can be fixed by welding, threading, etc. In this embodiment, the connection method between the first flange and the pipeline is not limited.

[0072] The sleeve 212 is hollow. As the liquid level in the connecting tube 10 rises, the liquid can flow into the hollow portion of the sleeve 212 until it contacts the liquid level detection unit 22. A connecting hole is formed in the sidewall of the sleeve 212, or in the top of the sleeve 212, to facilitate the smooth discharge of gas from the sleeve 212 and prevent the liquid level in the sleeve 212 from being out of sync with the liquid level in the connecting tube 10 due to gas resistance pressure.

[0073] A filter element, such as a cartridge filter element or a mesh filter element made of polypropylene, glass fiber, or ceramic, can be provided at the opening at the bottom of the sleeve 212 and the connecting hole on the side wall of the sleeve 212 ; the filter element can filter impurities in the liquid, reduce the wear of the liquid level detection unit 22 by impurities, and prevent impurities from clogging the sleeve 212 .

[0074] like Figure 1 、 Figure 2 and Figure 4 As shown, the liquid level detection unit 22 includes a plurality of electric contact liquid level gauges 221, and the sensing ends 2211 of the plurality of electric contact liquid level gauges 221 are disposed in the sleeve 212 and arranged at preset intervals along the axial direction of the sleeve 212; the sensing end 2211 of each electric contact liquid level gauge 221 is used to contact the liquid in the connecting pipe 10 to measure the liquid level in the connecting pipe 10.

[0075] The pit liquid level monitoring device 100 also includes multiple warning members 40, which are connected to the measurement circuit in a one-to-one correspondence with multiple electric contact liquid level gauges 221; the electric contact liquid level gauge 221 is configured to connect the corresponding measurement circuit when the sensing end 2211 contacts the liquid in the connecting pipe 10, so that the corresponding warning member 40 sends a warning message.

[0076] As the liquid in the connecting tube 10 rises, the liquid surface contacts the sensing end 2211 of the electric contact level gauge 221. Once the sensing end 2211 contacts the liquid, the corresponding measurement circuit is activated. This activated measurement circuit activates the connected warning element 40, causing it to emit a warning signal, such as a sound, light, or flashing indicator light. By deploying multiple electric contact level gauges 221 and warning elements 40, and setting thresholds at different liquid level heights, we can achieve accurate monitoring of the liquid level in the storage pit 200 and provide timely warnings.

[0077] In some embodiments, the sleeve 212 is made of conductive material, and when liquid exists between the sleeve 212 and the induction end 2211, the sleeve 212 and the induction end 2211 are conductive, thereby turning on the measurement loop.

[0078] It should be noted that, in the present application, the stepwise measurement of the liquid level in the pit 200 is realized, and a plurality of electric contact liquid level meters 221 are arranged corresponding to different working conditions or requirements. The measurement conditions are whether the liquid exists to turn on the induction end 2211 and the sleeve 212 of the electric contact liquid level meter 221, and the change of the pressure or temperature in the pit 200 does not affect the measurement result.

[0079] The warning member 40 can include one or more of a warning light, a horn, and a communication module. The warning light can indicate different states or warning information through different colors or different frequencies of light. The horn can play a warning role by emitting alarm sounds, beeping sounds, etc. The warning light and the horn can be used for on-site warning. The communication module can remotely transmit the liquid level monitoring information to a control center or workers, such as sending warning information in the form of short messages, emails, etc.

[0080] In other embodiments, the mounting member 21 can include a mounting shaft and a second flange 211, and the plurality of electric contact liquid level meters 221 are arranged on the outer side wall of the mounting shaft, and the second flange 211 is arranged at the end of the mounting shaft. In the present embodiment, the induction end 2211 of the electric contact liquid level meter 221 is exposed and directly in contact with the liquid in the communication pipe 10.

[0081] In a second aspect, the utility model provides a pit water injection system, as shown in the figure, the pit water injection system 1000 includes the pit liquid level monitoring device 100 as described in the first aspect. Through the pit liquid level monitoring device 100, the accuracy of liquid level detection is improved, and the pit water injection system 1000 can more accurately control the liquid level in the pit 200, thereby optimizing the cooling and stable operation of the reactor.

[0082] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A pit level monitoring device, characterized in that: include: a connecting pipe, at least partially embedded in a concrete structure outside the pit; the connecting pipe having a first end and a second end, the first end being connected to the bottom of the pit, the second end being exposed from the concrete structure and connected to the external environment; and the connecting pipe including a connecting portion provided at the second end; The measuring component includes a mounting member and a liquid level detection unit, wherein the mounting member is detachably connected to the connecting portion; the liquid level detection unit is connected to the mounting member, and the liquid level detection unit extends into the connecting pipe, and the liquid level detection unit is used to measure the liquid level in the connecting pipe.

2. The device for monitoring the liquid level of a heap pit according to claim 1, characterized in that: The heap pit liquid level monitoring device further includes an elastic abutment, which is connected to the outer side wall of the measuring assembly and abuts against the inner wall of the connecting pipe.

3. The device for monitoring the liquid level of a heap pit according to claim 2, characterized in that: There are multiple elastic abutting members, and the multiple elastic abutting members are arranged at intervals along the outer side wall of the measuring component.

4. The device for monitoring the liquid level of a heap pit according to claim 2, characterized in that: The elastic abutment member includes a guide cylinder, an elastic member and a ball, the guide cylinder is connected to the outer wall of the measuring component; the elastic member is arranged in the guide cylinder, and the elastic member is connected between the outer wall of the measuring component and the ball; part of the structure of the ball is exposed from the end of the guide cylinder away from the measuring component to abut against the inner wall of the connecting tube.

5. The device for monitoring the liquid level of a heap pit according to claim 1, characterized in that: The connecting portion includes a first flange; The mounting member includes a second flange, and the second flange is detachably connected to the first flange via a fastener.

6. The device for monitoring the liquid level of a heap pit according to claim 5, characterized in that: Along the direction from the first end to the second end, the connecting pipe includes a first pipe and a second pipe; the second pipe is vertically arranged, and the measuring component extends into the second pipe; the first pipe is used to connect the second pipe with the bottom of the pit.

7. The device for monitoring the liquid level of a heap pit according to claim 6, characterized in that: Along an extension direction perpendicular to the first pipeline, a cross section of the first pipeline is no higher than a communication position between the first pipeline and the stack pit.

8. The device for monitoring the liquid level of a heap pit according to any one of claims 1 to 7, characterized in that: The mounting member also includes a sleeve, and the liquid level detection unit includes a plurality of electric contact liquid level gauges, wherein the sensing ends of the plurality of electric contact liquid level gauges are disposed in the sleeve and arranged at preset intervals along the axial direction of the sleeve; the sensing ends of the electric contact liquid level gauges are used to contact the liquid in the connecting pipe to measure the liquid level in the connecting pipe.

9. The device for monitoring the liquid level of a heap pit according to claim 8, characterized in that: The stacking pit liquid level monitoring device further comprises a plurality of warning members, wherein the plurality of warning members and the plurality of electric contact liquid level gauges are connected to the measurement circuit in a one-to-one correspondence; The electric contact liquid level gauge is configured to connect the corresponding measuring circuit when the sensing end contacts the liquid in the connecting pipe, so that the corresponding warning member sends out a warning message.

10. A dump water injection system, characterized in that: It comprises the heap pit liquid level monitoring device according to any one of claims 1 to 9.

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