Magnetic liquid level switch

Abstract

The utility model discloses a magnetic liquid level switch which comprises a conduit, a floating assembly, a jacket assembly, a first-stage magnet assembly, a second-stage magnet assembly and a third-stage magnet assembly. The guide pipe is vertically arranged, and a pipe opening is formed in the bottom end of the guide pipe. The floating assembly comprises a ferromagnet and a floater, and the floater can ascend or descend along with to-be-detected liquid entering the guide pipe; the jacket assembly sleeves the guide pipe in a clamping manner; when the ferromagnet ascends or descends in the axis direction of the guide pipe, the primary magnet assembly can be movably arranged on the jacket assembly in a reciprocating mode. The secondary magnet assembly is in transmission connection with the primary magnet assembly; a microswitch structure in the third-stage magnet assembly has a safety state and a warning state, the second-stage magnet assembly can drive the microswitch structure to be switched between the safety state and the warning state, and therefore the microswitch structure can be isolated from the high-temperature environment through transmission of the first-stage magnet assembly and the second-stage magnet assembly, and the safety of the high-temperature environment is improved. The probability of fault and failure of the microswitch structure is reduced, and the use reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid level detection, and in particular relates to a magnetic liquid level switch. Background Art

[0002] The liquid level switch uses a floating block immersed in the liquid to move up and down in the conduit as the liquid level rises or falls, thereby affecting the connection or disconnection of the switch element connected to the conduit and sending a signal to the system to ultimately achieve the purpose of controlling the liquid level. However, when the liquid level switch is in a high temperature environment, for example, when using an existing liquid level switch to measure the liquid level at a nuclear power site, the liquid level switch is susceptible to problems such as shortened life, false alarms and failures caused by the on-site environment.

[0003] Based on the above, there is an urgent need for a magnetic liquid level switch to solve the technical problems existing in the prior art. Utility Model Content

[0004] The utility model aims to provide a magnetic liquid level switch, which can avoid the influence of high temperature environment on its performance, improve the reliability and performance, and enhance the applicability.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The magnetic liquid level switch comprises: a conduit, which is vertically arranged and has a pipe opening at the bottom for the liquid to be measured to enter; a floating assembly, which comprises a rigidly connected ferromagnetic body and a float, and the float can rise or fall with the liquid to be measured entering the conduit; a jacket assembly, which is clamped and sleeved on the conduit; a primary magnet assembly, which can be reciprocated and movably arranged on the jacket assembly when the ferromagnetic body rises or falls along the axial direction of the conduit; a secondary magnet assembly, which is transmission-connected to the primary magnet assembly; a tertiary magnet assembly, which is fixed on the jacket assembly and comprises a micro switch structure, the micro switch structure is arranged to have a safe state and a warning state, and the secondary magnet assembly can drive the micro switch structure to switch between the safe state and the warning state.

[0007] Optionally, the primary magnet assembly includes a rotating plate, a first magnet, a support column, an elastic member and a rotating shaft, the rotating plate is hingedly connected to the sleeve assembly, the first magnet is fixedly connected to the rotating plate, the support column is fixedly connected to the sleeve assembly, both ends of the elastic member are respectively fixedly connected to the support column and the rotating plate, and when the micro-switch structure is in a warning state, the elastic member has an elastic pre-tightening force, the rotating shaft is rotatably disposed on the sleeve assembly, and is transmission-connected to the rotating plate and the secondary magnet assembly.

[0008] Optionally, the first magnet is in a U-shaped structure, and the opening of the first magnet is arranged toward the catheter, so that when the first magnet is in contact with the catheter, the catheter can be inserted into the opening of the first magnet in a limited position.

[0009] Optionally, the secondary magnet assembly includes a second magnet and a limiting member, the second magnet is fixedly sleeved on the rotating shaft, and the limiting members are abutted against opposite sides of the second magnet, and the limiting member is fixedly connected to the rotating shaft.

[0010] Optionally, the tertiary magnet assembly further comprises a shell, the shell is fixedly connected to the jacket assembly, and the micro switch structure is accommodated in the shell;

[0011] The micro switch structure includes a chassis, a swing arm, a third magnet, a first contact, and a second contact. The chassis is fixedly connected to the housing, the swing arm is hingedly connected to the housing, the third magnet is arranged at the middle part of the swing arm, the first contact and the second contact are respectively arranged between the two ends of the swing arm and the chassis, the first contact is set to the safety state when closed, and the second contact is set to the warning state when closed, the third magnet can be magnetically coupled with the second magnet, and when the second magnet swings back and forth around its own axis, the second magnet can drive the swing arm to reciprocate so that the first contact and the second contact are alternately closed.

[0012] Optionally, the shell is made of ceramic material.

[0013] Optionally, the magnetic liquid level switch also includes a sealed shell, which includes a sealed shell, and the sealed shell is wrapped around the jacket assembly, the primary magnet assembly, the secondary magnet assembly and the tertiary magnet assembly, and the sealed shell is also filled with an inert gas.

[0014] Optionally, the sealing shell further includes a first locking hoop, a second locking hoop and a fastening bolt, the cross-sectional shapes of the first locking hoop and the second locking hoop are both semicircular, the first locking hoop is fixedly connected to the sealing shell and sleeved on the conduit, fastening threaded holes are provided at both ends of the first locking hoop, the second locking hoop is movably arranged on the sealing shell, and a fastening through hole corresponding to the fastening threaded hole is opened on the second locking hoop, and the fastening bolt is passed through the fastening through hole and threadedly connected to the fastening threaded hole.

[0015] Optionally, a socket assembly is further included, wherein the socket assembly includes a plurality of wiring terminals exposed outside the sealed housing, the wiring terminals are connected to the micro switch structure, and can receive signals sent by the micro switch structure.

[0016] Optionally, the sleeve assembly includes an external sleeve and a clamping block, the external sleeve is sleeved on the outer wall of the catheter, the clamping block is limitedly clamped on the external sleeve, the primary magnet assembly can be reciprocatedly arranged on the clamping block, and the tertiary magnet assembly is fixedly connected to the clamping block.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model provides a magnetic liquid level switch, which receives a ferromagnet to a specified position through a primary magnet assembly, and then drives the primary magnet assembly to start moving under the magnetic force of the ferromagnet, and then the primary magnet assembly drives the secondary magnet assembly to start moving, so that the secondary magnet assembly can drive a micro switch structure on the tertiary magnet assembly to switch between a safe state and a warning state, so that the micro switch structure can be isolated from a high temperature environment through the transmission of the primary magnet assembly and the secondary magnet assembly, thereby reducing the probability of malfunction and failure of electronic components in the micro switch structure, and improving the reliability of the use of the magnetic liquid level switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A front view of a magnetic liquid level switch provided by an embodiment of the utility model;

[0020] Figure 2 A top view of the primary magnet assembly, the secondary magnet assembly and the tertiary magnet assembly provided in an embodiment of the utility model after being connected.

[0021] In the figure:

[0022] 10. Catheter;

[0023] 20. Jacket assembly; 21. External sleeve; 22. Clamp block;

[0024] 30. Primary magnet assembly; 31. Rotating plate; 32. First magnet; 33. Support column; 34. Elastic member; 35. Rotating shaft;

[0025] 40. Secondary magnet assembly; 41. Second magnet; 42. Limiting member;

[0026] 50. tertiary magnet assembly; 51. housing; 52. fixing hook;

[0027] 60. Sealing shell; 61. Sealing housing; 62. Locking clamp assembly. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0031] The technical solution provided by the utility model is introduced below in conjunction with the accompanying drawings and specific embodiments.

[0032] The magnetic liquid level switch described in the utility model can be used for measuring liquid level on site in nuclear power plants. Figure 1 and Figure 2 As shown, its structure includes a catheter 10, a floating assembly, a jacket assembly 20, a primary magnet assembly 30, a secondary magnet assembly 40 and a tertiary magnet assembly 50.

[0033] The conduit 10 is vertically arranged with both ends open, and the pipe opening at the bottom is closer to the liquid to be tested. In this embodiment, the liquid to be tested is a high-temperature liquid used in nuclear power plants, such as water, liquid metal and other liquids used to cool nuclear reactors.

[0034] The floating assembly includes a ferromagnetic body and a float respectively fixed at both ends of the float rod to achieve a rigid connection. The float can be spherical or cylindrical, and the utility model is not limited to this. As long as the structural density of the float is less than the density of the liquid to be tested, the float can rise or fall with the water level of the liquid to be tested entering the catheter 10.

[0035] The jacket assembly 20 is clamped on the catheter 10. In this embodiment, the primary magnet assembly 30 can be reciprocatingly arranged on the jacket assembly 20, the secondary magnet assembly 40 is transmission-connected to the primary magnet assembly 30, and the tertiary magnet assembly 50 is fixedly arranged on the jacket assembly 20. Therefore, the fixed installation of the primary magnet assembly 30, the secondary magnet assembly 40 and the tertiary magnet assembly 50 on the catheter 10 can be achieved through the jacket assembly 20.

[0036] When in use, the above-mentioned tertiary magnet assembly 50 includes a micro switch structure, which has two states: a safe state and a warning state. The secondary magnet assembly 40 can be magnetically coupled with the tertiary magnet assembly 50, thereby driving the micro switch structure to switch between the safe state and the warning state.

[0037] Exemplarily, when the liquid to be tested in the catheter 10 is at a safe level, the micro switch structure is in a safe state. When the liquid level to be tested in the catheter 10 rises, the floating assembly can rise at the same time, and the ferromagnet rises to the magnetic attraction area, so that the primary magnet assembly 30 moves relative to the jacket assembly 20, and then the movement is transmitted to the secondary magnet assembly 40, so that the secondary magnet assembly 40 changes its initial state and starts to move, and can simultaneously drive the micro switch structure to switch from a safe state to a warning state, so as to send a warning message to the staff.

[0038] When the liquid level to be tested in the catheter 10 drops, causing the ferromagnet to retreat outside the magnetic attraction area, the primary magnet assembly 30 gradually returns to its initial position and drives the secondary magnet assembly 40 to gradually move back. Finally, the secondary magnet assembly 40 drives the microswitch assembly to switch to a safe state.

[0039] It should be noted that, since the liquid to be tested in a nuclear power plant is usually a high-temperature liquid used in the nuclear power plant, the temperature of the magnetic attraction area will become higher and higher as the liquid level of the liquid to be tested in the conduit 10 rises. If the micro switch structure is directly driven by a ferromagnet to switch the state, the micro switch structure needs to be set close to the magnetic attraction area, but this will cause the electronic components in the micro switch structure to be easily affected by high temperature and fail to function or malfunction, thereby causing false alarms and the like.

[0040] Based on this, the magnetic liquid level switch provided by the utility model receives the position information of the ferromagnet reaching the magnetic attraction area through the primary magnet assembly 30, then drives the secondary magnet assembly 40 to start moving, and then drives the switching of the micro switch structure state on the tertiary magnet assembly 50 through the secondary magnet assembly 40, so that the micro switch structure can be isolated from the high temperature environment through the transmission of the primary magnet assembly 30 and the secondary magnet assembly 40, thereby reducing the probability of malfunction and failure of the electronic components in the micro switch structure, and improving the reliability of the use of the magnetic liquid level switch.

[0041] Specifically, refer to Figure 1 As shown, in this embodiment, the jacket assembly 20 includes an external sleeve 21 and a clamping block 22, the external sleeve 21 is sleeved on the outer wall of the catheter 10, the clamping block 22 is clamped on the outer wall of the external sleeve 21, the primary magnet assembly 30 can be reciprocated and movably arranged on the clamping block 22, and the tertiary magnet assembly 50 is fixedly connected to the clamping block 22. The utility model, by using the above-mentioned jacket assembly 20, not only achieves the purpose of installing the primary magnet assembly 30, the secondary magnet assembly 40 and the tertiary magnet assembly 50 on the catheter 10, but also can isolate the primary magnet assembly 30 from the catheter 10 through the external sleeve 21, thereby reducing the negative effects of high temperature on the magnetism of the primary magnet assembly such as aging to a certain extent, thereby ensuring the reliability and service life of the primary magnet assembly 30.

[0042] Optionally, the external sleeve 21 can be a glass fiber sleeve, a silicone rubber sleeve, a silicone rubber sleeve, etc. All types of the external sleeve 21 can effectively reduce the negative impact of high temperature on the primary magnet assembly 30. Those skilled in the art can choose according to actual working conditions, and the present invention is not limited to this.

[0043] Specifically, in this embodiment, combined with Figure 1 and Figure 2As shown, the primary magnet assembly 30 comprises a rotating plate 31, a first magnet 32, a support column 33, an elastic member 34 and a rotating shaft 35. The rotating plate 31 is a U-shaped structure, one end of which is hingedly connected to the clamp block 22 through a connecting shaft, and the main body of the rotating plate 31 can be fixedly connected to the first magnet 32 ​​through a fixing member such as a threaded connector, so that when the rotating plate 31 rotates around the clamp block 22, it can drive the first magnet 32 ​​to rotate in a direction close to or away from the catheter 10, so that the first magnet 32 ​​is in contact with or spaced from the catheter 10; one end of the support column 33 is fixedly connected to the clamp block 22 and extends in a direction away from the clamp block 22; the elastic member 34 is preferably a spring, and the two ends of the spring are respectively buckled into the first through hole and the second through hole respectively provided on the support column 33 and the rotating plate 31; the rotating shaft 35 is rotatably arranged on the side of the clamp block 22 opposite to the support column 33, and is opposite to the extension direction of the support column 33, and is transmission-connected to the secondary magnet assembly 40.

[0044] When in use, illustratively, in this embodiment, the ferromagnet and the first magnet 32 ​​are set to have opposite magnetic properties. When the ferromagnet has not risen to the magnetic attraction area, the elastic member 34 is in a restored state and limits the first magnet 32 ​​to be set at a certain distance from the catheter 10 at this time; when the ferromagnet rises to the magnetic attraction area, the ferromagnet will attract the first magnet 32 ​​to move in the direction close to the catheter 10, and at the same time, the first magnet 32 ​​drives the rotating plate 31 to rotate, and the elastic member 34 is stretched and obtains elastic preload; when the ferromagnet drops to be outside the magnetic attraction area again, the magnetic force of the ferromagnet on the first magnet 32 ​​is weakened, and the elastic member 34 is restored to pull the rotating block to rotate back, and then the first magnet 32 ​​is moved in the direction away from the catheter 10 by the rotating block, so that the first magnet 32 ​​is reset.

[0045] Through the elastic preload of the elastic member 34, when the ferromagnetic body drops to outside the magnetic attraction area, the first magnet 32 ​​can be automatically driven to accurately reset, thereby improving the stability, accuracy and reliability of the primary magnet assembly 30 during operation. In addition, the primary magnet assembly 30 and the secondary magnet assembly 40 are closely matched and compactly connected, which is specifically manifested as follows: when the rotating block rotates, it can simultaneously move the rotating shaft 35 and the secondary magnet assembly 40, so that the secondary magnet assembly 40 can immediately drive the micro switch structure to switch between the safe state and the warning state, and timely and effectively convey the liquid level information to the staff, thereby ensuring the speed and real-time nature of the liquid level information transmission. At the same time, it also effectively simplifies the structure of the primary magnet assembly 30 and saves production costs.

[0046] It should be noted that, in other embodiments, the ferromagnet and the first magnet 32 ​​may also have the same magnetic properties, and accordingly, the magnetic attraction area is changed to a magnetic repulsion area. At this time, when the ferromagnet has not risen to the magnetic repulsion area, the first magnet 32 ​​is in close connection with the catheter 10, and the elastic member 34 is in a restored state; after the ferromagnet rises to the magnetic repulsion area, it can provide the first magnet 32 ​​with a magnetic force to move in a direction away from the catheter 10, and the first magnet 32 ​​drives the rotating block to rotate, so that the elastic member 34 is compressed, so that the elastic member 34 has an elastic preload; when the ferromagnet drops to be outside the magnetic repulsion area again, the elastic member 34 is restored, so that the push block can drive the first magnet 32 ​​to move in a direction close to the catheter 10 and reset. Through the above arrangement, it is also possible to achieve the reciprocating movement of the primary magnet assembly 30 with the secondary magnet assembly 40.

[0047] More specifically, the support column 33 includes a threaded adjustment member, a first clamping block, a second clamping block and a hook ring, wherein one end of the first clamping block is fixedly connected to the clamping block 22 and has an internal threaded hole extending in the axial direction, one end of the second clamping block is coaxially arranged on the first clamping block and has a through hole extending in the axial direction, the hook ring limit clamp is arranged between the first clamping block and the second clamping block, and a first through hole for the elastic member 34 to be buckled into is opened on the protruding extension arm, and the threaded end of the threaded adjustment member is passed through the through hole and is threadedly connected to the internal threaded hole to lock the extension arm between the first clamping block and the second clamping block at a preset inclination angle.

[0048] Through the above arrangement, the staff can eliminate the locking clamping force of the first clamping block and the second clamping block on the hook ring by screwing the threaded adjustment piece, so that the inclination angle of the hook ring can be adjusted as required. When the inclination angle of the hook ring changes, the elastic member 34 can be driven to pull the rotating block to rotate, thereby fine-tuning the relative position between the first magnet 32 ​​and the catheter 10. It should be noted that since the magnetic attraction between the ferromagnet and the first magnet 32 ​​in the magnetic attraction area will basically not change, the stretched length of the elastic member 34 will basically not change after the inclination angle of the elastic member 34 changes, but the relative distance between the first magnet 32 ​​and the catheter 10 will change. Therefore, by adjusting the inclination angle of the hook ring, it can be ensured that the first magnet 32 ​​moves into place (in this embodiment, the position where the first magnet 32 ​​moves into place is set when it is in contact with the catheter 10, for example Figure 1 As shown in the figure, when the rotating shaft 35 rotates to the right position, it can move the secondary magnet assembly 40 to the right position, thereby ensuring that the secondary magnet assembly 40 can drive the micro switch structure to accurately switch between the safe state and the warning state to avoid failure. In addition, the above-mentioned adjustment process of the tilt angle of the hook ring is safe and reliable, easy to operate, and effectively reduces the operating pressure of the staff.

[0049] Preferably, in this embodiment, the first magnet 32 ​​is a U-shaped magnet, and the opening of the first magnet 32 ​​is arranged toward the catheter 10, so that when the first magnet 32 ​​is in contact with the catheter 10, the catheter 10 can be limitedly inserted into the opening of the first magnet 32, thereby ensuring the stability of the relative position between the first magnet 32 ​​and the catheter 10, preventing instability caused by position displacement or loosening of the first magnet 32, and ensuring the stability of the magnetic liquid level switch in transmitting liquid level information.

[0050] Specifically, in this embodiment, the secondary magnet assembly 40 includes a second magnet 41 and a stopper 42. The second magnet 41 is fixedly sleeved on the outer circumference of the rotating shaft 35, and the two opposite sides of the second magnet 41 are both in contact with the stopper 42, so that the stopper 42 is fixedly connected to the rotating shaft 35. For example, the rotating shaft 35 is provided with an external thread section, the limiting member 42 is selected as an M2.5 nut, and the second magnet 41 has an internal thread mounting hole. When installing the secondary magnet assembly 40, firstly, one of the limiting members 42 is screwed to a preset position on the rotating shaft 35, and then the second magnet 41 is threadedly connected to the rotating shaft 35 and abutted against the limiting member 42. Finally, the other limiting member 42 is screwed onto the rotating shaft 35 and abutted against the second magnet 41. Thus, the installation of the secondary magnet assembly and the limiting of the second magnet 41 are completed, the overall structure of the secondary magnet assembly 40 is simplified, and the timely and effective force transmission between the rotating shaft 35 and the second magnet 41 can be effectively guaranteed.

[0051] Specifically, in this embodiment, the three-level magnet assembly 50 further includes a housing 51, which is fixedly connected to the clamp 22, and the micro switch structure is accommodated in the housing 51, so as to protect the micro switch structure through the housing 51. Furthermore, the housing 51 is made of ceramic material, so that the housing 51 has strong high temperature resistance and insulation and heat insulation, so that the thermal isolation of the micro switch structure is further enhanced.

[0052] Furthermore, in this embodiment, the specific implementation method of fixing the housing 51 on the clamping block 22 is as follows:

[0053] The three-stage magnet assembly 50 also includes a fixed hook 52, which is a rib with a U-shaped cross-section, and the fixed hook 52 is made of stainless steel. After the shell 51 is fitted and connected to the middle part of the fixed hook 52, the shell 51 is fixedly connected to the clamping block through the two ends of the fixed hook 52, thereby achieving a fixed connection between the shell 51 and the clamping block 22. The advantage of using the fixed hook 52 is that compared with using a sheet-like fixed structure, the contact area between the fixed hook 52 and the shell 51 is smaller, which can greatly reduce the thermal impact of the fixed hook 52 on the shell 51, so that the heated area of ​​the shell 51 is effectively reduced, thereby extending the reliability and service life of the shell 51.

[0054] Specifically, in this embodiment, the micro switch structure includes a chassis, a swing arm, a third magnet, a first contact, and a second contact. Among them, the chassis is fixedly connected to the housing 51, the swing arm is hingedly connected to the housing 51, a third magnet is arranged in the middle of the swing arm, and the above-mentioned first contact and second contact are respectively arranged between the two ends of the swing arm and the chassis. In this embodiment, when the first contact is closed, the micro switch structure can send a signal of a safe state to the staff; when the second contact is closed, the micro switch structure can send a signal of a warning state to the staff. The third magnet can be magnetically coupled with the second magnet 41, so that when the second magnet 41 swings back and forth around its own axis, it can also drive the third magnet to swing back and forth, so that the swing arm reciprocates under the driving force of the third magnet, thereby achieving the purpose of alternating closure of the first contact and the second contact.

[0055] The micro switch structure is compact and occupies a small space, and can be safely and stably accommodated in the housing 51, thereby effectively reducing the size design of the housing 51. In addition, since a third magnet capable of magnetically coupling with the second magnet 41 is provided in the middle of the swing arm, when the swing arm moves, a corresponding electrical signal can be generated to timely drive the third magnet to make a corresponding position change, thereby achieving the sensitivity of the entire micro switch structure and the accuracy of detection.

[0056] It should be noted that, in this embodiment, the first contact and the second contact are both made of pure silver, which can effectively improve the capacity and service life of the first contact and the second contact.

[0057] Specifically, in this embodiment, refer to Figure 1 , Figure 2As shown, the magnetic level switch also includes a sealed shell 60, which includes a sealed shell 61 wrapped around the jacket assembly 20, the primary magnet assembly 30, the secondary magnet assembly 40 and the tertiary magnet assembly 50, and is filled with an inert gas in the sealed shell 61, so as to isolate the micro switch structure from the high temperature and high pressure nuclear power environment through the double protection of the sealed shell 61 and the shell 51. In addition, the inert gas has the characteristics of high stability and chemical inertness. By setting the sealed shell 61 and the inert gas (such as nitrogen, argon and helium, etc.), the primary magnet assembly 30, the secondary magnet assembly 40 and the third magnet assembly are isolated from the humid nuclear power site, preventing the first magnet 32, the second magnet 41 and the third magnet from being damp and oxidized, thereby ensuring the safety and reliability of the use of the magnetic level switch.

[0058] More specifically, the sealing shell 60 further includes a locking hoop assembly 62, which includes a first locking hoop, a second locking hoop and a fastening bolt. The cross-sectional shapes of the first locking hoop and the second locking hoop are both semicircular, and the first locking hoop is fixedly connected to the sealing shell 61 and sleeved on the outer circumference of the external sleeve 21, and fastening threaded holes are provided at both ends of the first locking hoop; the second locking hoop is detachably arranged on the sealing shell 61, and fastening through holes corresponding to the first fastening threaded holes are provided at both ends of the second locking hoop.

[0059] During the specific installation, circular holes can be firstly opened on the two end faces of the sealing shell 61, and the two ends of the external sleeve 21 can be sealed and sleeved respectively, and the inner circumference of the first locking clamp can be fitted against the outer circumference of the external sleeve 21, and then the two end faces of the sealing shell 61 can be fixedly connected to the external sleeve 21 by welding or other methods; then the side face ( Figure 1 , Figure 2 The sealing shell 61 is annularly enclosed and sealed to cover the external sleeve 21, the primary magnet assembly 30, the secondary magnet assembly 40, the tertiary magnet assembly 50 and the clamp 22 located between the two end surfaces; then the sealing shell 61 is evacuated by a vacuum pump and a gas supply device, and then filled with an inert gas; then the entire sealing shell 61 is inserted on the outer peripheral surface of the catheter 10, and after the entire sealing shell 61 is in a preset position on the catheter 10, the second locking clamp is matched with the first locking clamp to surround and clamp the external sleeve 21, and finally two M6 fastening bolts are used to penetrate the fastening through holes and threadedly connected with the fastening threaded holes, so that the sealing shell 61 is firmly installed on the catheter 10.

[0060] Specifically, in this embodiment, the magnetic liquid level switch also includes a socket assembly, which includes a plurality of wiring terminals exposed from the sealed housing 61, and the wiring terminals are connected to the micro-switch structure in the tertiary magnet assembly 50, so that the signal received by the micro-switch structure can be transmitted to the control system, and the liquid level information can be sent to the staff through the control system in a timely manner.

[0061] For example, in this embodiment, three wiring terminals are provided, so as to be directly connected to the three wiring terminals through the three-core plug of the control system. In this way, compared with the existing method that requires the staff to extend the wiring of the control system into the sealed shell 61 and connect it with the micro switch structure, the wiring speed of the staff can be faster, the wiring is simpler and more convenient, and the time of the staff being exposed to the nuclear power detection site is greatly reduced, thereby improving the personal safety of the staff.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Magnetic liquid level switch, characterized in that: include: The conduit (10) is arranged vertically and has a pipe opening at the bottom end for the liquid to be tested to enter; A floating assembly, comprising a rigidly connected ferromagnetic body and a float, wherein the float can rise or fall following the liquid to be tested entering the conduit (10); A clamping sleeve assembly (20), the clamping sleeve being arranged on the catheter (10); a primary magnet assembly (30), which can be reciprocatingly movably disposed on the jacket assembly (20) when the ferromagnetic body rises or falls along the axial direction of the catheter (10); A secondary magnet assembly (40) drivingly connected to the primary magnet assembly (30); The tertiary magnet assembly (50) is fixedly mounted on the jacket assembly (20) and comprises a micro switch structure, wherein the micro switch structure is configured to have a safe state and a warning state, and the secondary magnet assembly (40) can drive the micro switch structure to switch between the safe state and the warning state.

2. The magnetic liquid level switch according to claim 1, characterized in that: The primary magnet assembly (30) comprises a rotating plate (31), a first magnet (32), a support column (33), an elastic member (34) and a rotating shaft (35); the rotating plate (31) is hingedly connected to the jacket assembly (20); the first magnet (32) is fixedly connected to the rotating plate (31); the support column (33) is fixedly connected to the jacket assembly (20); two ends of the elastic member (34) are respectively fixedly connected to the support column (33) and the rotating plate (31); when the micro switch structure is in a warning state, the elastic member (34) has an elastic pre-tightening force; the rotating shaft (35) is rotatably arranged on the jacket assembly (20) and is transmission-connected to the rotating plate (31) and the secondary magnet assembly (40).

3. The magnetic liquid level switch according to claim 2, characterized in that: The first magnet (32) has a U-shaped structure, and an opening of the first magnet (32) is arranged toward the catheter (10), so that when the first magnet (32) is in contact with the catheter (10), the catheter (10) can be inserted into the opening of the first magnet (32) in a limited manner.

4. The magnetic liquid level switch according to claim 2, characterized in that: The secondary magnet assembly (40) comprises a second magnet (41) and a stopper (42); the second magnet (41) is fixedly sleeved on the rotating shaft (35), and the stopper (42) is abutted against two opposite sides of the second magnet (41); the stopper (42) is fixedly connected to the rotating shaft (35).

5. The magnetic liquid level switch according to claim 4, characterized in that: The tertiary magnet assembly (50) further comprises a housing (51), wherein the housing (51) is fixedly connected to the jacket assembly (20), and the micro switch structure is accommodated in the housing (51); The micro switch structure comprises a chassis, a swing arm, a third magnet, a first contact and a second contact; the chassis is fixedly connected to the housing (51); the swing arm is hingedly connected to the housing (51); the third magnet is arranged in the middle of the swing arm; the first contact and the second contact are arranged between the two ends of the swing arm and the chassis respectively; the first contact is set to the safety state when closed; and the second contact is set to the warning state when closed; the third magnet can be magnetically coupled with the second magnet (41); when the second magnet (41) reciprocates around its own axis, the second magnet (41) can drive the swing arm to reciprocate, so that the first contact and the second contact are alternately closed.

6. The magnetic liquid level switch according to claim 5, characterized in that: The housing (51) is made of ceramic material.

7. The magnetic liquid level switch according to any one of claims 1 to 6, characterized in that: The magnetic liquid level switch also includes a sealing shell (60), wherein the sealing shell (60) includes a sealing shell (61), wherein the sealing shell (61) is wrapped around the jacket assembly (20), the primary magnet assembly (30), the secondary magnet assembly (40) and the tertiary magnet assembly (50), and the sealing shell (61) is also filled with an inert gas.

8. The magnetic liquid level switch according to claim 7, characterized in that: The sealing shell (60) also includes a locking hoop assembly (62), which includes a first locking hoop, a second locking hoop and a fastening bolt. The cross-sections of the first locking hoop and the second locking hoop are both semicircular. The first locking hoop is fixedly connected to the sealing shell (61) and is sleeved on the conduit (10). Fastening threaded holes are provided at both ends of the first locking hoop. The second locking hoop can be movably arranged on the sealing shell (61), and a fastening through hole corresponding to the fastening threaded hole is opened on the second locking hoop. The fastening bolt is passed through the fastening through hole and is threadedly connected to the fastening threaded hole.

9. The magnetic liquid level switch according to claim 7, characterized in that: It also comprises a socket assembly, which comprises a plurality of connection terminals exposed outside the sealed housing (61), the connection terminals being connected to the micro switch structure and capable of receiving signals sent by the micro switch structure.

10. The magnetic liquid level switch according to any one of claims 1 to 6, characterized in that: The jacket assembly (20) comprises an external sleeve (21) and a clamping block (22), wherein the external sleeve (21) is sleeved on the outer wall of the catheter (10), and the clamping block (22) is limitedly clamped on the external sleeve (21), the primary magnet assembly (30) is reciprocatingly movably arranged on the clamping block (22), and the tertiary magnet assembly (50) is fixedly connected to the clamping block (22).

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