CN220688174U - Multifunctional magnetic induction type valve limit switch - Google Patents

Abstract

The utility model discloses a multifunctional magnetic induction type valve limit switch, which relates to the technical field of nuclear power valves and comprises a limit switch substrate and a shell arranged on the switch substrate, wherein two ends of the shell are respectively provided with holes and closed, the side wall of one closed end of the shell is provided with external threads for installation, one end of the shell hole is internally provided with a bearing inner part and a signal switching circuit board which is arranged at the end part of the bearing inner part and is connected with the outside, the bearing inner part is provided with a reed switch, a fixed circuit board which is used for fixing the reed switch and transmitting the reed switch signal to the signal switching circuit board, an external permanent magnet at the closed end of the shell is triggered close to the reed switch, and the reed switch is disconnected when the external permanent magnet is far away from the shell; the nuclear power limit switch is developed by modules, so that the design and development workload is reduced, the types of products are enriched, the products can adapt to various application scenes, meanwhile, the whole machine has strong environmental adaptability, and normal operation under different severe conditions is ensured.

Description

Multifunctional magnetic induction type valve limit switch

Technical Field

The utility model relates to the technical field of nuclear power valves, in particular to a multifunctional magnetic induction type valve limit switch.

Background

Limit switches are widely used in various industries, and in general, the limit switches are used for limiting the position or the travel of mechanical movement, and in an electrical control system, the limit switches are used for realizing sequential control, positioning control and detection of position states and are used for controlling the travel and limiting protection of mechanical equipment.

The nuclear power valve is used as a key component of a nuclear island system, the running stability and reliability of the nuclear power valve are critical to the safety of a nuclear power plant, the limit switch is used as a core component of an electrical control system of the nuclear power valve, and the key position state of the valve is monitored in real time in a contact or non-contact mode to complete the action feedback of the valve and the accurate control of the valve position, so that the functions of interlocking control during normal running of the nuclear island system, remote alarm indication under abnormal conditions of the system, automatic safety protection and the like are realized.

The nuclear-grade valve limit switch can be divided into a contact type and a non-contact type in principle, the non-contact type valve limit switch reduces mechanical abrasion, the influence of high temperature and vibration is avoided, the applicability is wider and the non-contact type valve limit switch is favored by users, the non-contact type switch mainly comprises an inductance type switch, a capacitance type switch and a magnetic induction type switch, the electric performance adaptation degree is wider, the current nuclear-grade non-contact type limit switch mainly adopts the magnetic induction type principle, the common magnetic induction type limit switch comprises a reed pipe type and a magnetic attraction type switch, the inside of the reed pipe type limit switch adopts a simple structure of a single reed pipe, and the magnetic attraction type limit switch has the advantages of light weight, small volume, low cost and the like.

Aiming at the form of a signal interface, the nuclear power site can meet different requirements according to different environments, for example, some positions are required to be high-temperature resistant and waterproof, the protection level is required to be more than IP68, some are required to be IP67, and the production materials of different protection levels are very different in cost; the limit switch with the connector is convenient for the limit switch body to replace in time because the limit switch is required to be replaced frequently at some positions, the limit switch and the cable are scrapped integrally after a certain period of time, a direct wire-out mode can be used, and the operation cost can be saved because the connector meeting the nuclear-level requirement has high price; the type of the cable in the form of direct outgoing line is fixed, the length is fixed, all field installation interface conditions cannot be matched, if the signal cable is arranged on the field, if the limit switch is directly provided with the corresponding reserved wiring terminal, the direct wiring or replacement can be realized on the field, and the use is convenient and quick.

The existing nuclear-grade limit switch signal output port is provided with a form of directly outgoing lines by using epoxy resin for sealing, and also provided with a form of directly installing connectors, the use scene is single and limited, different versions are independently developed and identified, the research and development cost is high, and if a product is matched with the application environment of a nuclear power plant, the possible production cost is high.

Disclosure of Invention

Therefore, the utility model aims to provide the multifunctional magnetic induction type valve limit switch which not only meets the performance requirement of a nuclear power environment, but also meets the requirements of various wiring forms on a nuclear power site, and simultaneously saves the research, development, design and production cost.

The utility model provides a multifunctional magnetic induction type valve limit switch which adopts the following technical scheme:

the utility model provides a multi-functional magnetic induction formula valve limit switch, includes the shell that sets up on the switch basement, the both ends of shell trompil respectively with seal the setting, be equipped with the external screw thread that is used for the installation on the lateral wall of shell closed one end, be equipped with in the one end of shell trompil bearing internals and set up in bearing internals tip and with external connection's signal switching circuit board, be equipped with the tongue tube on the bearing internals, be used for fixed tongue tube and with tongue tube signal transmission to signal switching circuit board's fixed circuit board, be equipped with the signal switching needle on the fixed circuit board, signal switching needle is connected with signal switching circuit board and is used for transmitting tongue tube on-off signal, be equipped with the sealing washer between bearing internals and the signal switching circuit board, the one end that the shell trompil set up is equipped with the connecting piece, be connected with signal output cable on the connecting piece, signal output cable and signal switching circuit board signal connection, the outside permanent magnet of shell closed one end is close to when the shell tongue tube triggers, the tongue tube disconnection when the outside permanent magnet is kept away from the shell.

Further, the connecting piece is a cable fixing seat which is arranged on the shell and used for fixing the signal output cable.

Further, be equipped with the cable solid fixed ring on the cable fixing base, the cable solid fixed ring is used for locking signal output cable on the cable fixing base.

Further, the high-temperature epoxy resin is filled in the position, which is connected with the signal transfer circuit board, of the signal output cable in the shell.

Further, the connecting piece is a binding post arranged at one end of the shell opening, the binding post comprises a binding post shell connected with the shell and a switching seat arranged in the binding post shell and connected with the signal switching circuit board in a signal mode, and the switching seat is connected with the signal output cable in a signal mode.

Further, a cable clamp for fixing the signal output cable is arranged in the wiring terminal shell, and a fixing nut for fixing the cable clamp is arranged on the wiring terminal shell.

Further, be equipped with the sealing ring in the binding post shell and be used for compressing tightly the sealing ring, signal output cable passes cable clamp, sealing ring and signal switching circuit board signal connection.

In summary, the present utility model comprises at least one of the following beneficial effects:

1. the limit switch is divided into a limit switch substrate and different interface forms, the shell of the limit switch substrate is made of stainless steel materials, the internal reed switch is fixed by a ceramic-based material circuit board, the structure is simple, and the reliability is high; the nuclear power limit switch is developed by modules, so that the design and development workload is reduced, the types of products are enriched, the products can adapt to various application scenes, meanwhile, the whole machine has strong environmental adaptability, and the normal operation under different severe conditions is ensured;

2. the direct outlet is directly connected with the cable, and is sealed by high-temperature epoxy, so that most nuclear power working conditions can be met, IP67 can be achieved in protection level, and meanwhile, parts are fewer, and the production cost is lower;

3. the reserved wiring terminal can facilitate the on-site wiring and replacement of a user, and also satisfies most nuclear power working conditions, and the protection grade can achieve IP67.

Drawings

FIG. 1 is a schematic diagram of a limit switch substrate according to the present utility model;

FIG. 2 is a schematic diagram of a limit switch substrate according to a second embodiment of the present utility model;

FIG. 3 is a schematic diagram of a first embodiment of the present utility model;

FIG. 4 is a second schematic structural diagram of the first embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a second embodiment of the present utility model.

Reference numerals illustrate:

1. a housing; 11. supporting the inner member; 111. a reed pipe; 112. fixing the circuit board; 113. a signal transfer needle; 12. a signal transfer circuit board; 121. a signal output male; 122. a signal output head; 13. a cable fixing seat; 131. a cable fixing ring; 14. a seal ring; 15. stainless steel external tooth lock washers; 16. a hexagonal nut; 2. a signal output cable; 3. a connection terminal; 31. a terminal housing; 32. an adapter; 33. a cable clamp; 34. a seal ring; 35. sealing compression rings; 36. crimping the male pin; 37. a fixing nut; 38. double-ended female needle.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model.

The utility model is described in further detail below with reference to fig. 1-5.

The embodiment of the utility model discloses a multifunctional magnetic induction type valve limit switch.

According to the embodiment I, referring to fig. 1-4, the multifunctional magnetic induction type valve limit switch comprises a shell 1 arranged on a switch substrate, two ends of the shell 1 are respectively provided with holes and closed, an external thread used for installation is arranged on the side wall of one closed end of the shell 1, a pair of stainless steel external tooth locking washers 15 and hexagonal nuts 16 are arranged at the thread of the shell 1, the purpose is to facilitate installation and disassembly of the limit switch, the shell 1 is made of stainless steel materials and is integrally formed, a supporting inner part 11 and a signal switching circuit board 12 which is arranged at the end part of the supporting inner part 11 and is connected with the outside are arranged in one end of the shell 1, the supporting inner part 11 is made of PEEK materials, a reed pipe 111 is arranged on the supporting inner part 11, a fixed circuit board 112 used for fixing the reed pipe 111 and transmitting signals of the reed pipe 111 to the signal switching circuit board 12 is arranged on the side wall of the closed end, three signal pins of COM, NC and NO are respectively led out, the reed pipe 111 is fixed on the fixed circuit board 112 in a welding mode, the fixed circuit board 112 is made of ceramic substrate, the material of the fixed circuit board 112 is a ceramic substrate, the supporting inner part 11 is arranged on the fixed circuit board is far away from the outer side of the shell 1, and is connected with the signal switching circuit board 2, and the signal switching circuit board is connected with the outer part 1, and the signal switching circuit board is arranged on the outer part is far from the fixed, and is far from the fixed on the surface of the outer part of the shell 2, and is connected with the signal switching circuit board 12, and is far from the signal connecting surface of the signal switching device 11.

In this embodiment, the fixed circuit board 112 is provided with signal transfer pins 113, the signal transfer pins 113 are connected with the signal transfer circuit board 12 for transmitting switching signals of the reed switch 111, a through hole is formed in the middle of the support inner member 11 for facilitating the signal transfer pins 113 to pass through, 3 signal transfer pins 113 are L-shaped pins, one end of each signal transfer pin 113 is welded on the fixed circuit board 112, the other end of each signal transfer pin 113 is welded on the signal transfer circuit board 12, and the material of each signal transfer pin 113 is copper alloy; thereby receiving the reed switch 111 switch signal and outputting the signal through the signal transfer pin 113.

In this embodiment, a sealing ring 14 is disposed between the supporting inner member 11 and the signal switching circuit board 12, the sealing ring 14 is made of silicone rubber or fluororubber, so that the medium cannot leak into the internal cavity in the process of sealing with the high-temperature epoxy resin in the later stage, and the sealing ring 14 is made of silicone rubber or fluororubber.

In this embodiment, the connector is a cable fixing seat disposed on the housing 1 and used for fixing the signal output cable 2, 3 rectangular signal output heads 122 are welded on the signal switching circuit board 12, a hole is formed in the middle of the strip, welding with the signal output cable 2 is facilitated, the signal switching circuit board 12 is used for switching the switching signals on the 3 signal switching pins 113 to the 3 signal output heads 122 through an internal circuit, and then the signals are output to the outside through connection with the signal output cable 2, the material of the signal switching circuit board 12 is a ceramic substrate, and the insulation and irradiation resistance performance are higher.

In this embodiment, the cable fixing base 13 is provided with a cable fixing ring 131, the cable fixing ring 131 is used for locking the signal output cable 2 on the cable fixing base 13, the cable fixing ring 131 locks the signal output cable 2 on the cable fixing base 13 through 2 fixing screws, and simultaneously the cable fixing base 13, the signal switching circuit board 12 and the bearing inner part 11 are fixed on the shell 1 through the fixing screws, so that the inner parts are not loosened, and meanwhile, the fact that the signal output cable 2 is pulled in the assembly process to cause welding loosening is prevented.

In this embodiment, the high-temperature epoxy resin is filled in the position of the housing 1 where the signal output cable 2 is connected to the signal switching circuit board 12, so that the internal device is isolated from the external environment, and the internal device and the welding point are prevented from falling off due to oxidation corrosion caused by long-term exposure to the air, thereby causing a switching signal output fault.

The second embodiment, refer to fig. 1, fig. 2 and fig. 5, and the first embodiment is different in that the connecting piece is a connecting terminal 3 disposed at one end of the opening of the housing 1, the connecting terminal 3 includes a connecting terminal housing 31 connected with the housing 1 and a switching seat 32 disposed in the connecting terminal housing 31 and connected with the signal switching circuit board 12 in a signal manner, the connecting terminal housing 31 is made of stainless steel, a joint with the housing 1 is sealed by laser welding, the integral protection is ensured to be reliable, the switching seat 32 is made of peek material, and has good insulation and irradiation resistance, and the switching seat 32 is connected with the signal output cable 2 in a signal manner.

In this embodiment, the cable clamp 33 for fixing the signal output cable 2 and 3 crimp pins 36 are disposed in the terminal housing 31, the cable clamp 33 is made of stainless steel, 3 wire cores of the signal output cable 2 are respectively corresponding to COM, NC and NO signals, during on-site connection, the 3 wire cores are respectively pressed and fixed with the 3 crimp pins 36 through special clamps, the 3 crimp pins 36 are inserted into one end of the adapter seat 32, 3 double-ended female pins 38 are embedded in the adapter seat 32, switching of signals is ensured, the crimp pins 36 and the double-ended female pins 38 are made of copper alloy materials, not only a certain strength can also ensure conduction of electrical signals, but also the adapter seat 32 is inserted into the terminal housing 31, the other end face female head of the adapter seat 32 is connected with the 3 signal output male heads 121 in a matched manner, the positions of the 3 signal output male heads 121 are asymmetric, and error connection of later joints is avoided, a fixing nut 37 for fixing the cable clamp 33 is disposed on the terminal housing 31, the cable clamp 33 is compressed by the pretightening force of the fixing nut 37, thereby the signal output cable 2 is fixed, and the cable 2 is ensured to be locked, and the internal connection of the signal output cable 2 is ensured, and the stainless nut 37 is not to be pulled by the stainless steel.

In this embodiment, the terminal housing 31 is provided with a sealing ring 34 and a sealing compression ring 35 for compressing the sealing ring 34, the signal output cable 2 passes through the fixing nut 37, the cable clamp 33, the sealing ring 34 and the sealing compression ring 35 to be connected with the signal switching circuit board 12 in a signal mode, the sealing ring 34, the sealing compression ring 35 and the cable clamp 33 are pushed into the terminal housing 31 during installation, then the fixing nut 37 is assembled with a threaded opening on the terminal housing 31 after being screwed tightly, the sealing compression ring 35 compresses the sealing ring 34 under stress, connection tightness is guaranteed, in this embodiment, the sealing compression ring 35 is made of stainless steel materials, the sealing ring 34 is made of radiation-resistant rubber materials such as ethylene propylene diene monomer, and fixing and sealing reliability are guaranteed.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.

Claims (7)

1. A multifunctional magnetic induction type valve limit switch is characterized in that: including setting up shell (1) on the switch basement, trompil and the closed setting respectively in the both ends of shell (1), be equipped with the external screw thread that is used for the installation on the lateral wall of shell (1) closed one end, be equipped with bearing internals (11) in the one end of shell (1) trompil and set up in bearing internals (11) tip and with externally connected signal switching circuit board (12), be equipped with tongue tube (111) on bearing internals (11), be used for fixed tongue tube (111) and with tongue tube (111) signal transmission to fixed circuit board (112) of signal switching circuit board (12), be equipped with signal switching needle (113) on fixed circuit board (112), signal switching needle (113) are connected and are used for transmitting tongue tube (111) switching signal with signal switching circuit board (12), be equipped with sealing washer (14) between bearing internals (11) and the signal switching circuit board (12), the one end that shell (1) trompil set up is equipped with the connecting piece, be connected with signal output cable (2) on the connecting piece, signal output cable (2) are close to when signal switching cable (12) and signal switching circuit board (12) are connected with signal switching circuit board (111) outside when keeping away from the tongue tube (111).

2. The multi-function magnetic induction valve limit switch of claim 1, wherein: the connecting piece is a cable fixing seat (13) which is arranged on the shell (1) and used for fixing the signal output cable (2).

3. The multifunctional magnetic induction valve limit switch of claim 2, wherein: the cable fixing seat (13) is provided with a cable fixing ring (131), and the cable fixing ring (131) is used for locking the signal output cable (2) on the cable fixing seat (13).

4. A multi-function magnetic induction valve limit switch as claimed in claim 3, wherein: the high-temperature epoxy resin is filled in the position, which is connected with the signal transfer circuit board (12), of the signal output cable (2) in the shell (1).

5. The multi-function magnetic induction valve limit switch of claim 1, wherein: the connecting piece is a binding post (3) arranged at one end of an opening of the shell (1), the binding post (3) comprises a binding post shell (31) connected with the shell (1) and a switching seat (32) arranged in the binding post shell (31) and connected with a signal switching circuit board (12) in a signal mode, and the switching seat (32) is connected with a signal output cable (2) in a signal mode.

6. The multi-function magnetic induction valve limit switch of claim 5, wherein: the connecting terminal is characterized in that a cable clamp (33) for fixing the signal output cable (2) is arranged in the connecting terminal shell (31), and a fixing nut (37) for fixing the cable clamp (33) is arranged on the connecting terminal shell (31).

7. The multi-functional magnetic induction valve limit switch of claim 6, wherein: the connecting terminal is characterized in that a sealing ring (34) and a sealing pressing ring (35) used for pressing the sealing ring (34) are arranged in the connecting terminal shell (31), and the signal output cable (2) passes through the cable clamp (33), the sealing ring (34) and the sealing pressing ring (35) to be connected with the signal switching circuit board (12) in a signal mode.