WO2023134760A1 - 过电流保护装置和集成有该过电流保护装置的防爆电磁阀 - Google Patents

过电流保护装置和集成有该过电流保护装置的防爆电磁阀 Download PDF

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Publication number
WO2023134760A1
WO2023134760A1 PCT/CN2023/072245 CN2023072245W WO2023134760A1 WO 2023134760 A1 WO2023134760 A1 WO 2023134760A1 CN 2023072245 W CN2023072245 W CN 2023072245W WO 2023134760 A1 WO2023134760 A1 WO 2023134760A1
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WO
WIPO (PCT)
Prior art keywords
overcurrent protection
protection device
circuit stage
overcurrent
solenoid valve
Prior art date
Application number
PCT/CN2023/072245
Other languages
English (en)
French (fr)
Inventor
高捷
赵丹
Original Assignee
世格流体控制（上海）有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202220131146.XU external-priority patent/CN217036747U/zh
Priority claimed from CN202210050603.7A external-priority patent/CN114465218A/zh
Application filed by 世格流体控制（上海）有限公司 filed Critical 世格流体控制（上海）有限公司
Publication of WO2023134760A1 publication Critical patent/WO2023134760A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current

Definitions

  • the present disclosure relates to the technical field of electronic circuits, and more particularly, to an overcurrent protection device for electromagnetic actuation equipment and an explosion-proof solenoid valve integrated with the overcurrent protection device.
  • Electromagnetic actuation devices such as solenoid valves, which control the action of actuators based on electromagnetic force, have been widely used in various industrial fields.
  • explosion-proof certified explosion-proof solenoid valves are widely used as actuators.
  • the explosion-proof solenoid valve seals all parts that may ignite flammable substances in a housing, which has a flameproof function, that is, it can withstand the flammability that penetrates into the interior of the housing through any joint surface or structural gap. The substance explodes internally without damage and does not cause an explosion in the flammable atmosphere outside the enclosure. Therefore, the explosion-proof solenoid valve places the components that may generate sparks, arcs and dangerous temperatures in the flameproof casing, so that the space inside the flameproof casing is separated from the external environment.
  • Electromagnetically actuated devices such as solenoid valves typically use electric current for control.
  • an overcurrent such as a lightning strike or a power failure may cause an electromagnetically actuated device to operate abnormally, thereby causing malfunction or causing an accident. Therefore, it is necessary to equip the explosion-proof solenoid valve with a special overcurrent protection device.
  • the purpose of the present disclosure is to provide an overcurrent protection device for electromagnetic actuation equipment and an explosion-proof solenoid valve integrated with the overcurrent protection device.
  • an overcurrent protection device for electromagnetic actuation equipment which includes: at least one discharge circuit stage configured to be connected in parallel to the electromagnetic actuation equipment Between the current input port and the current output port, it is used to discharge the overcurrent; at least one limit circuit stage is configured to be connected in parallel between the current input port and the current output port, and is used to control the current input port and the current output port. The voltage between is limited and the overcurrent is released; and at least one attenuation circuit stage is configured to be connected in series in the current path between the current input port and the current output port of the electromagnetic actuation device, for the attenuation current path overcurrents where the limit circuit stage is closer to the electromagnetically actuated device than the decay and discharge circuit stages.
  • an explosion-proof solenoid valve device which includes: a solenoid valve; the overcurrent protection device according to the above aspect of the present disclosure, configured to be coupled to the solenoid valve and prevent overcurrent from affecting the solenoid valve. causing damage; and an explosion-proof enclosure configured to house the solenoid valve and the overcurrent protection device.
  • an explosion-proof solenoid valve device which includes: a lower case; a solenoid valve accommodated in the lower case; a printed circuit board disposed on the solenoid valve; and an upper case configured Cooperate with the lower housing to form an explosion-proof cavity containing the solenoid valve and a printed circuit board, wherein the printed circuit board is provided with the overcurrent protection device according to the above aspect of the present disclosure, which is configured to be coupled to the solenoid valve and prevent Overcurrent damages the solenoid valve.
  • the overcurrent protection device of the present disclosure by setting the discharge circuit level, the limit circuit level and the attenuation circuit level between the power supply and the electromagnetic actuation equipment, a multi-layer overcurrent protection is provided for the electromagnetic actuation equipment, thereby enhancing the protection against overcurrent. Current withstand capability and extended service life.
  • the overcurrent protection device of the present disclosure by connecting the discharge circuit stage and the limit circuit stage for releasing the overcurrent in parallel with the electromagnetic actuation device, even when the overcurrent protection device fails, the safety of the electromagnetic actuation device is not affected. work properly, increasing reliability.
  • explosion-proof solenoid valve of the present disclosure by integrating the overcurrent protection device in the explosion-proof solenoid valve, explosion-proof certification can be carried out as a whole, which is beneficial to compatibility with each other and can greatly simplify the installation process.
  • the overcurrent protection device is arranged on the printed circuit board and integrated in the explosion-proof solenoid valve, and the electronic components of the overcurrent protection device are physically isolated from the electromagnetic coil of the solenoid valve, thereby ensuring itself temperature performance while avoiding adverse effects on the performance of the solenoid coil.
  • Figure 1 shows a perspective view of field installation of an overcurrent protection device according to the prior art
  • FIG. 2 shows an equivalent circuit diagram of an overcurrent protection device according to the prior art
  • Fig. 3 shows a block diagram of an overcurrent protection device according to an embodiment of the present disclosure
  • FIG. 4A shows an equivalent circuit diagram of an overcurrent protection device according to an embodiment of the present disclosure
  • FIG. 4B shows an equivalent circuit diagram of an overcurrent protection device according to an alternative embodiment of the present disclosure
  • FIG. 5 shows a perspective view of an explosion-proof solenoid valve according to an embodiment of the present disclosure
  • FIG. 6 shows an exploded perspective view of an explosion-proof solenoid valve according to an embodiment of the present disclosure.
  • FIG. 7 shows a cross-sectional view of an explosion-proof solenoid valve according to an embodiment of the present disclosure.
  • Fig. 1 is a perspective view of field installation of an overcurrent protection device according to the prior art.
  • prior art overcurrent protection devices such as lightning protection devices for electromagnetically actuated equipment such as explosion-proof solenoid valves (not shown) typically have an externally mounted tubular configuration.
  • Explosion-proof solenoid valves are usually current control devices, so as shown in Figure 1, the lightning protection device includes a metal case and a lightning protection circuit.
  • the externally connected current input wire, current output wire and protective ground wire are connected to the lightning protection circuit set in the metal casing, wherein the protective ground wire is connected to the metal casing.
  • the signal wires used to control the electromagnetic coil of the explosion-proof solenoid valve are drawn from the lightning protection circuit, including current input wires, current output wires and system ground wires.
  • Fig. 2 is an equivalent circuit diagram of an overcurrent protection device according to the prior art.
  • the prior art overcurrent protection device such as lightning protection device for electromagnetically actuated equipment such as explosion-proof solenoid valve is a surge protector (Surge Protective Device), which is used to prevent damage caused by lightning strikes or power failures. Damage to electromagnetically actuated equipment due to overcurrent.
  • a surge protector is connected in parallel with the electromagnetic coil of the electromagnetically actuated device.
  • the lightning protection device includes two gas discharge tubes and a transient suppression diode, wherein the two gas discharge tubes are respectively connected between the current input port and the current output port and one end of the transient suppression diode, and the transient suppression diode
  • the other end of the state suppression diode is grounded so that when an overcurrent such as that caused by a lightning strike or a power failure occurs in the current path between the current input port and the current output port, the overcurrent is released to the ground.
  • the externally installed tubular lightning protection device shown in Fig. 1 and Fig. 2 has poor surge withstand capability and is easily damaged.
  • this tubular lightning protection device has a large volume and has potential safety hazards in the installation process, and its application convenience and reliability in explosion-proof sites are relatively poor.
  • this tubular anti- Lightning devices require qualified professionals for installation and wiring, so they cannot be customized for explosion-proof solenoid valve products.
  • the explosion-proof performance of the tube-type lightning protection device and the explosion-proof solenoid valve is independent of each other, and requires separate certification and maintenance according to the overall system, resulting in high installation and maintenance costs.
  • the present disclosure proposes an improved overcurrent protection device for electromagnetic actuation equipment.
  • FIG. 3 shows a block diagram of an overcurrent protection device 300 according to an embodiment of the present disclosure.
  • the overcurrent protection device 300 for the electromagnetic actuation device 100 includes at least one discharge circuit stage 310 , at least one limit circuit stage 320 and at least one damping circuit stage 330 .
  • a discharge circuit stage 310 is connected in parallel between the current input port IN and the current output port OUT of the electromagnetic actuation device 100 for discharging overcurrent.
  • a limit circuit stage 320 is connected in parallel between the current input port IN and the current output port OUT, and is used to control the voltage between the current input port IN and the current output port OUT. limit and release overcurrent.
  • an attenuation circuit stage 330 is connected in series in the current path between the current input port IN and the current output port OUT of the electromagnetic actuation device 100, and is used to attenuate excess current in the current path. current.
  • the limit circuit stage 320 is closer to the electromagnetic actuation device 100 than the attenuation circuit stage 330 and the discharge circuit stage 310 .
  • FIG. 4A shows an equivalent circuit diagram of an overcurrent protection device 300 according to an embodiment of the present disclosure.
  • the discharge circuit stage 310 includes a first discharge circuit stage 3101 and a second discharge circuit stage 3102 .
  • the first discharge circuit stage 3101 is connected in parallel between the current input port IN and the current output port OUT of the electromagnetic actuation device 100 and includes gas discharge tubes G1 and G2 .
  • the gas discharge tube G1 is connected between the current input port IN and the first node N1
  • the gas discharge tube G2 is connected between the current output port OUT and the first node N1, Used to discharge the overcurrent to the ground GND when an overcurrent such as lightning strike or power failure occurs in the current path between the current input port IN and the current output port OUT.
  • Gas Discharge Tube (Gas Discharge Tube) is an intermittent protection device, which has a large insulation resistance between electrodes and a small parasitic capacitance.
  • a certain voltage is applied between the two poles of the gas discharge tube, an uneven electric field is generated between the poles.
  • the gas usually air or inert gas
  • the gap between the two electrodes will be broken down by the discharge, and the original insulating state will be transformed into a conductive state.
  • the voltage between the two poles of the gas discharge tube is maintained at the residual voltage level determined by the discharge arc, which is usually very low, so that the electromagnetically actuated equipment connected in parallel with the gas discharge tube is protected from various surge pulses damage. Since the gas discharge tube is a well-known device to those skilled in the art, for the sake of brevity, the details of the gas discharge tube will not be described in more detail here.
  • the second discharge circuit stage 3102 is connected in parallel between the current input port IN and the current output port OUT of the electromagnetic actuation device 100 and includes piezoresistors RV1 and RV2 .
  • the piezoresistor RV1 is connected between the current input port IN and the first node N1
  • the piezoresistor RV2 is connected between the current output port OUT and the first node N1.
  • Time is used to discharge the overcurrent to the ground GND when an overcurrent such as lightning strike or power failure occurs in the current path between the current input port IN and the current output port OUT.
  • a varistor is a non-linear resistive element.
  • the resistance of a varistor is related to the voltage applied across it. When the voltage applied to the piezoresistor is within its nominal value, the resistance of the resistor is infinite, and almost no current flows through it. When the voltage across the piezoresistor is slightly greater than the nominal voltage, the piezoresistor breaks down and conducts quickly, and its resistance drops quickly, making the resistor in a conduction state, so it can effectively protect the electromagnetically actuated equipment from Damage from various surge pulses. Since piezoresistors are devices well known to those skilled in the art, for the sake of brevity, the details of piezoresistors will not be described in more detail here.
  • the first discharge circuit stage 3101 and the second discharge circuit stage 3102 are grounded via a common discharge element. As shown in FIG. 4A, both the first discharge circuit stage 3101 and the second discharge circuit stage 3102 are connected to the first node N1. As shown in FIG. 4A , for example, a gas discharge tube G3 may be connected between the first node N1 and the ground GND as a discharge element.
  • FIG. 4B shows an equivalent circuit diagram of an overcurrent protection device 400 according to an alternative embodiment of the present disclosure. Components in FIG. 4B that are the same as those in FIG. 4A are denoted by the same reference numerals, and repetitive descriptions will be omitted herein.
  • the first discharge circuit stage 3101 is grounded via the gas discharge tube G3 as the discharge element of the first discharge circuit stage 3101, and the second discharge circuit stage 3101 is grounded.
  • the electric circuit stage 3102 is grounded via the piezoresistor RV3 as a discharge element of the second discharge circuit stage 3102 .
  • the gas discharge tube G3 can be used as the discharge element of the first discharge circuit stage 3101 and connected between the first node N1 and the ground GND, and the piezoresistor RV3 can be used as the discharge element of the second discharge circuit stage 3102
  • the discharge element is connected between the second node N2 and the ground GND.
  • the limiting circuit stage 320 is connected in parallel between the current input port IN and the current output port OUT, and includes a first transient suppression diode T1 and a second transient Suppress diode T2.
  • the first TVS diode T1 and the second TVS diode T2 may be connected in parallel between the current input port IN and the current output port OUT.
  • Transient voltage suppressor diode (Transient Voltage Suppressor) is a high-efficiency protection device in the form of a diode.
  • Transient Voltage Suppressor is a high-efficiency protection device in the form of a diode.
  • the two poles of the TVS diode When the two poles of the TVS diode are impacted by reverse transient high energy, it can change the high impedance between the two poles to low impedance in a very short time and absorb surge power up to several thousand watts, making the voltage between the two poles Clamped at a predetermined value to effectively protect electromagnetically actuated equipment from damage by various surge pulses.
  • TVS diodes are devices well known to those skilled in the art, for the sake of brevity, the details of TVS diodes will not be described in more detail here.
  • Limiting circuit stage 320 is described herein as a preferred embodiment with two TVS diodes connected in series, the present disclosure is not limited thereto.
  • Limiting circuit stage 320 may include only one TVS diode.
  • a redundant design can be achieved using two or more TVS diodes connected in series. That is to say, if one of the two TVS diodes is broken down and short-circuited, the other can still ensure normal operation, thereby ensuring that the electromagnetic actuation device is normally powered to maintain normal operation.
  • the ability of the first discharge circuit stage 3101 composed of gas discharge tubes G1 and G2 to release overcurrent is stronger than that of the second discharge circuit stage 3102 composed of piezoresistors RV1 and RV2, while The ability of the second discharge circuit stage 3102 composed of resistors RV1 and RV2 to discharge overcurrent is stronger than that of the limiting circuit stage 320 composed of the first transient suppression diode T1 and the second transient suppression diode T2. Therefore, according to an embodiment of the present disclosure, the discharge circuit stage 310 is arranged at the front end of the limit circuit stage 320 .
  • the first discharge circuit stage 3101 composed of gas discharge tubes G1 and G2 is disposed at the front end of the second discharge circuit stage 3102 composed of piezoresistors RV1 and RV2.
  • the stronger the ability of the circuit stage to release overcurrent the farther away it is located from the electromagnetic actuation device, so as to effectively prevent damage caused by such as lightning strike or power failure. Damage to electromagnetically actuated equipment due to overcurrent.
  • the gas discharge tubes G1 and G2 of the first discharge circuit stage 3101 release most of the overcurrent
  • the varistor RV1 of the second discharge circuit stage 3102 and RV2 release most of the remaining overcurrent, so that only a small part of the overcurrent enters the first TVS diode T1 and the second TVS diode T2 of the limiting circuit stage 320, and the first TVS diode T1 and the second TVS diode T2 releases and clamps.
  • the attenuation circuit stage 330 is connected in series in the current path between the current input port IN and the current output port OUT, and includes a first attenuation circuit stage 3301 and a second attenuation circuit stage 3301. Attenuation circuit stage 3302.
  • the first attenuation circuit stage 3301 is arranged between the first discharge circuit stage 3101 and the second discharge circuit stage 3102, and includes a series connection with the current input port IN
  • the first resistor R1 and the second resistor R2 are connected in series with the current output port OUT.
  • the second attenuation circuit stage 3302 is arranged between the second discharge circuit stage 3102 and the limiting circuit stage 320, and includes a resistor connected in series with the first resistor R1
  • the third resistor R3 and the fourth resistor R4 are connected in series with the second resistor R2.
  • the first to fourth resistors R1, R2, R3, and R4 constituting the attenuation circuit stage 330 may be decoupling resistors, such as low-value wirewound resistors, so that the overcurrent is attenuated in stages. At the same time, it does not affect the control current supplied to the electromagnetic actuation device 100 during normal operation.
  • the first to fourth resistors R1, R2, R3, and R4 use low-value wirewound resistors to improve the surge current passing capability in the current path between the current input port IN and the current output port OUT, thereby Guarantees the lifetime of resistors between circuit stages.
  • the circuit topology of the overcurrent protection devices 300 and 400 shown in FIG. 4A and FIG. 4B is just a specific example of the implementation of the present disclosure, but the present disclosure is not limited thereto.
  • the number of discharge circuit stages 310 , limiting circuit stages 320 and attenuation circuit stages 330 included in the overcurrent protection devices 300 and 400 can be set arbitrarily according to design requirements.
  • the number of electronic components constituting the discharge circuit stage 310 , the limiting circuit stage 320 and the attenuation circuit stage 330 can be set arbitrarily according to design requirements.
  • the electronic components constituting the discharge circuit stage 310, the limit circuit stage 320 and the attenuation circuit stage 330 Protection devices capable of similar functions other than the gas discharge tubes, varistors and TVS diodes described above may be used.
  • the relative positional relationship between the discharge circuit stage 310, the limit circuit stage 320 and the attenuation circuit stage 330 can be adjusted arbitrarily, as long as the limit circuit stage 320 is directly connected in parallel with the electromagnetic actuation device 100 as the last circuit stage.
  • the overcurrent protection devices 300 and 400 according to the embodiments of the present disclosure shown in FIG. 4A and FIG. 4B have three circuit stages for discharging overcurrent, namely, the first discharge circuit stage 3101, the second discharge circuit stage 3102 and limit circuit level 320. Therefore, when an overcurrent occurs, the overcurrent can be suppressed and reduced step by step, so that the overcurrent reaching the electromagnetic actuation device is extremely small, thereby effectively ensuring the service life of the electromagnetic actuation device. As shown in Fig. 4A and Fig.
  • the overcurrent I1 flowing through the first discharge circuit stage 3101 is much larger than the overcurrent I2 flowing through the second discharge circuit stage 3102, and the overcurrent I2 is much larger than the overcurrent I2 flowing through the limit
  • the overcurrent I3 of the circuit stage 320 is much larger than the overcurrent I4 flowing through the electromagnetic actuation device.
  • the TVS diode is arranged in the frontmost circuit stage, and its overcurrent level is relatively high, which is easy to cause damage and short circuit.
  • the TVS diode is arranged in the last circuit stage, and the overcurrent passes through the front two circuit stages. Release has been reduced to a low level, so the TVS diode is fully capable of performing release and clamping with low overcurrent. That is to say, compared with the overcurrent protection device according to the prior art, the overcurrent protection device according to the embodiments of the present disclosure avoids failure phenomena such as signal short circuit within the nominal discharge current range.
  • the overcurrent protection device according to the prior art shown in FIG. 2 components connected in series in the current path, such as wires or resistors, may be burnt due to overcurrent, thereby causing the current path to be disconnected.
  • the overcurrent protection devices 300 and 400 according to the embodiments of the present disclosure shown in FIG. 4A and FIG. 4B due to the use of the protection structure of three circuit levels, the overcurrent level between the circuit levels is greatly reduced. , thereby improving the withstand capacity of the current path and reducing the chance of wire or resistor burnout. That is to say, compared with the overcurrent protection device according to the prior art, the overcurrent protection device according to the embodiments of the present disclosure avoids failure phenomena such as signal disconnection within the nominal discharge current range.
  • the overcurrent protection device may be integrated with an electromagnetically actuated device such as an explosion-proof solenoid valve.
  • the overcurrent protection device can be provided on the printed On a circuit board, integrated into explosion-proof solenoid valves in an internally mounted manner, to prevent damage to electromagnetically actuated equipment caused by overcurrents such as lightning strikes or power failures.
  • FIG. 5 shows a perspective view of an explosion proof solenoid valve 500 according to an embodiment of the present disclosure.
  • FIG. 6 shows an exploded perspective view of an explosion-proof solenoid valve 500 according to an embodiment of the present disclosure.
  • FIG. 7 shows a cross-sectional view of an explosion-proof solenoid valve 500 according to an embodiment of the present disclosure.
  • an explosion-proof solenoid valve device 500 may include a lower case 501 , a solenoid valve 502 , a printed circuit board 503 and an upper case 504 .
  • the electromagnetic valve 502 may include a valve body 5021 , an electromagnetic coil 5022 , a moving iron core 5023 and a base 5024 . Since a solenoid valve is an electromagnetically actuated device well known to those skilled in the art, for the sake of brevity, the details of the solenoid valve will not be described in more detail here.
  • a solenoid valve 502 may be accommodated in a lower case 501 .
  • a printed circuit board 503 is disposed on the solenoid valve 502 and provided with an overcurrent protection device according to an embodiment of the present disclosure as described above in conjunction with FIGS. 4A and 4B .
  • the printed circuit board 503 provided with an overcurrent protection device is coupled to the solenoid valve 502 and prevents the solenoid valve 502 from being damaged by an overcurrent such as lightning strike or power failure.
  • the overcurrent protection device according to the embodiment of the present disclosure as described above with reference to FIGS. 4A and 4B may be configured to be implemented in the form of a printed circuit board.
  • the printed circuit board 503 may have at least two layers of wiring to ensure that its height and width are controllable and its structure is compact.
  • the printed circuit board 503 may be provided with a protective cover for protecting the overcurrent protection device.
  • the protective cover may be made of epoxy resin.
  • the upper housing 504 cooperates with the lower housing 501 to form an explosion-proof cavity for accommodating the solenoid valve 502 and the printed circuit board 503 .
  • the cooperation between the upper case 504 and the lower case 501 can be realized by screws 505 .
  • the overcurrent protection device of the present disclosure by setting the discharge circuit level, the limit circuit level and the attenuation circuit level between the power supply and the electromagnetic actuation equipment, a multi-layer overcurrent protection is provided for the electromagnetic actuation equipment, thereby enhancing the protection against overcurrent. Current withstand capability and extended service life.
  • the overcurrent protection device of the present disclosure by connecting the discharge circuit stage and the limit circuit stage for releasing the overcurrent in parallel with the electromagnetic actuation device, even when the overcurrent protection device fails, the safety of the electromagnetic actuation device is not affected. work properly, increasing reliability.
  • explosion-proof solenoid valve of the present disclosure by integrating the overcurrent protection device in the explosion-proof solenoid valve, explosion-proof certification can be carried out as a whole, which is beneficial to compatibility with each other and can greatly simplify the installation process.
  • the overcurrent protection device is arranged on the printed circuit board and integrated in the explosion-proof solenoid valve, and the electronic components of the overcurrent protection device are physically isolated from the electromagnetic coil of the solenoid valve, thereby ensuring itself temperature performance while avoiding adverse effects on the performance of the solenoid coil.

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Abstract

本公开提供了用于电磁致动设备的过电流保护装置和集成有该过电流保护装置的防爆电磁阀。根据本公开的用于电磁致动设备的过电流保护装置包括：至少一个放电电路级，被配置成并联连接在电磁致动设备的电流输入端口和电流输出端口之间，用于释放过电流；至少一个限位电路级，被配置成并联连接在电流输入端口和电流输出端口之间，用于对电流输入端口和电流输出端口之间的电压进行限位并且释放过电流；以及至少一个衰减电路级，被配置成串联连接在电磁致动设备的电流输入端口和电流输出端口之间的电流路径中，用于衰减电流路径中的过电流，其中限位电路级较之衰减电路级和放电电路级更靠近电磁致动设备。

Description

过电流保护装置和集成有该过电流保护装置的防爆电磁阀 技术领域
本公开涉及电子电路的技术领域，更具体地，涉及用于电磁致动设备的过电流保护装置和集成有该过电流保护装置的防爆电磁阀。
背景技术
基于电磁力控制致动器动作的诸如电磁阀的电磁致动设备已被广泛应用于各个工业领域中。特别是在使用危险的气体、液体或粉末物质的化工行业中，广泛地使用经防爆认证的防爆电磁阀作为致动器。具体地，防爆电磁阀将可能点燃可燃性物质的全部部件封闭在一个壳体内，该壳体具有隔爆功能，即能够承受通过壳体的任何接合面或结构间隙渗透到壳体内部的可燃性物质在内部爆炸而不损坏，并且不会引起壳体外部的可燃性环境中的爆炸。因此，防爆电磁阀将可能产生火花、电弧和危险温度的部件均放置在隔爆壳体内，使得隔爆壳体内部的空间与外部的环境隔开。
诸如电磁阀的电磁致动设备通常使用电流进行控制。然而，诸如雷击或电源故障引起的过电流可能导致电磁致动设备异常动作，从而引发故障或造成事故。因此，有必要为防爆电磁阀配备专用的过电流保护装置。
发明内容
在下文中给出了关于本公开的简要概述，以便提供关于本公开的某些方面的基本理解。但是，应当理解，这个概述并不是关于本公开的穷举性概述。它并不是意图用来确定本公开的关键性部分或重要部分，也不是意图用来限定本公开的范围。其目的仅仅是以简化的形式给出关于本公开的某些概念，以此作为稍后给出的更详细描述的前序。
本公开的目的在于提供用于电磁致动设备的过电流保护装置和集成有该过电流保护装置的防爆电磁阀。
根据本公开的一个方面，提供了一种用于电磁致动设备的过电流保护装置，其包括：至少一个放电电路级，被配置成并联连接在电磁致动设备 的电流输入端口和电流输出端口之间，用于释放过电流；至少一个限位电路级，被配置成并联连接在电流输入端口和电流输出端口之间，用于对电流输入端口和电流输出端口之间的电压进行限位并且释放过电流；以及至少一个衰减电路级，被配置成串联连接在电磁致动设备的电流输入端口和电流输出端口之间的电流路径中，用于衰减电流路径中的过电流，其中限位电路级较之衰减电路级和放电电路级更靠近电磁致动设备。
根据本公开的另一方面，提供了一种防爆电磁阀装置，其包括：电磁阀；根据本公开的上述方面的过电流保护装置，被配置成耦接至电磁阀并且防止过电流对电磁阀造成损害；以及防爆壳体，被配置成容纳电磁阀和电流保护装置。
根据本公开的又一方面，提供了一种防爆电磁阀装置，其包括：下壳体；电磁阀，容纳在下壳体中；印刷电路板，设置在电磁阀上；以及上壳体，被配置成与下壳体配合以形成容纳电磁阀和印刷电路板的防爆空腔，其中印刷电路板上设置有根据本公开的上述方面的过电流保护装置，其被配置成耦接至电磁阀并且防止过电流对电磁阀造成损害。
根据本公开的过电流保护装置，通过在电源和电磁致动设备之间设置放电电路级、限位电路级和衰减电路级为电磁致动设备提供了多层过电流保护，从而增强了对过电流的耐受能力并且延长了使用寿命。
根据本公开的过电流保护装置，通过将用于释放过电流的放电电路级和限位电路级与电磁致动设备并联连接，即使在过电流保护装置出现故障时仍不影响电磁致动设备的正常工作，从而提高了可靠性。
根据本公开的防爆电磁阀，通过将过电流保护装置集成在防爆电磁阀中，可以作为整体进行防爆认证，有利于彼此兼容，能够极大地简化安装过程。
根据本公开的防爆电磁阀，将过电流保护装置设置在印刷电路板上并且内置集成在防爆电磁阀中，并且使过电流保护装置的电子元件与电磁阀的电磁线圈物理隔离，从而在保证自身的温度性能的同时避免对电磁线圈的性能造成不利影响。
在下面的说明书部分中给出本公开实施方式的其他方面，其中，详细说明用于充分地公开本公开实施方式的优选实施方式，而不对其施加限定。
附图说明
参照下面结合附图对本公开实施方式的说明，会更加容易地理解本公开的以上和其它目的、特点和优点，在附图中：
图1示出了根据现有技术的过电流保护装置的现场安装透视图；
图2示出了根据现有技术的过电流保护装置的等效电路图；
图3示出了根据本公开的实施方式的过电流保护装置的框图；
图4A示出了根据本公开的实施方式的过电流保护装置的等效电路图；
图4B示出了根据本公开的替选实施方式的过电流保护装置的等效电路图；
图5示出了根据本公开的实施方式的防爆电磁阀的透视图；
图6示出了根据本公开的实施方式的防爆电磁阀的分解透视图；以及
图7示出了根据本公开的实施方式的防爆电磁阀的截面视图。
具体实施方式
现将在下文中参照附图更全面地描述本公开，在附图中示出了各实施方式。然而，本公开可以以许多不同的方式实施，并且不应被解释为限于本文阐述的实施方式。相反，这些实施方式被提供使得本公开将是详尽的和完整的，并且将向本领域技术人员全面传达本公开的范围。
本文使用的术语仅用于描述具体实施方式的目的，而非旨在成为限制。除非上下文清楚地另有所指，否则如本文使用的“一”、“一个”、“该”和“至少之一”并非表示对数量的限制，而是旨在包括单数和复数二者。例如，除非上下文清楚地另有所指，否则“一个部件”的含义与“至少一个部件”相同。“至少之一”不应被解释为限制于数量“一”。“或”意指“和/或”。术语“和/或”包括相关联的列出项中的一个或更多个的任何和全部组合。
本文中使用的术语仅用于描述特定实施方式的目的，而非旨在限制本公开。如本文所使用的，除非上下文另外指出，否则单数形式旨在也包括复数形式。还将理解的是，说明书中使用的术语“包括”、“包含”和“具 有”旨在具体说明所陈述的特征、实体、操作和/或部件的存在，但是并不排除一个或更多个其他的特征、实体、操作和/或部件的存在或添加。
除非另有定义，否则本文中使用的包括技术术语和科学术语的所有术语具有与本申请所属领域的技术人员通常理解的含义相同的含义。将进一步理解的是，诸如在常用词典中定义的那些术语应该被解释为具有与其在相关领域的上下文中的含义一致的含义，除非在此明确定义否则不应以理想化或过于正式的意义来解释。
在下面的描述中，阐述了许多具体细节以提供对本公开的全面理解。本公开可以在没有这些具体细节中的一些或所有具体细节的情况下实施。在其他实例中，为了避免因不必要的细节而模糊了本公开，在附图中仅仅示出了与根据本公开的方案密切相关的部件，而省略了与本公开关系不大的其他细节。
图1是根据现有技术的过电流保护装置的现场安装透视图。
如图1所示，用于电磁致动设备例如防爆电磁阀(未示出)的现有技术的过电流保护装置例如防雷装置通常具有外部安装的管式配置。防爆电磁阀通常是电流控制设备，因此如图1所示，防雷装置包括金属外壳和防雷电路。外部接入的电流输入线、电流输出线和保护地线连接到设置在金属外壳中的防雷电路，其中保护地线连接到金属外壳。随后，从防雷电路引出用于控制防爆电磁阀的电磁线圈的信号线，包括电流输入线、电流输出线和系统地线。
图2是根据现有技术的过电流保护装置的等效电路图。
如图2所示，用于电磁致动设备例如防爆电磁阀的现有技术的过电流保护装置例如防雷装置是电涌保护器(Surge Protective Device)，用于防止诸如雷击或电源故障引起的过电流对电磁致动设备造成损害。电涌保护器与电磁致动设备的电磁线圈并联连接。如图2所示，防雷装置包括两个气体放电管和一个瞬态抑制二极管，其中两个气体放电管分别连接在电流输入端口和电流输出端口与瞬态抑制二极管的一端之间，并且瞬态抑制二极管的另一端接地，使得在电流输入端口和电流输出端口之间的电流路径中出现诸如雷击或电源故障引起的过电流时，将过电流释放到地。
然而，图1和图2所示的这种外部安装的管式防雷装置的浪涌耐受能力差，容易损坏。此外，这种管式防雷装置体积较大并且在安装过程中存在安全隐患，在防爆现场的应用便利度和可靠性较差。此外，这种管式防 雷装置需要有资质的专业人员进行安装接线，因此无法针对防爆电磁阀的产品进行定制。而且，这种管式防雷装置与防爆电磁阀的防爆性能彼此独立，需要按照整体系统进行单独认证和维护，造成安装和维护成本较高。
针对现有技术中存在的以上缺陷，本公开提出了一种改进的用于电磁致动设备的过电流保护装置。
图3示出了根据本公开的实施方式的过电流保护装置300的框图。
如图3所示，根据本公开的实施方式，用于电磁致动设备100的过电流保护装置300包括至少一个放电电路级310、至少一个限位电路级320和至少一个衰减电路级330。
如图3所示，根据本公开的实施方式，放电电路级310并联连接在电磁致动设备100的电流输入端口IN和电流输出端口OUT之间，用于释放过电流。
如图3所示，根据本公开的实施方式，限位电路级320并联连接在电流输入端口IN和电流输出端口OUT之间，用于对电流输入端口IN和电流输出端口OUT之间的电压进行限位并且释放过电流。
如图3所示，根据本公开的实施方式，衰减电路级330串联连接在电磁致动设备100的电流输入端口IN和电流输出端口OUT之间的电流路径中，用于衰减电流路径中的过电流。
如图3所示，根据本公开的实施方式，限位电路级320较之衰减电路级330和放电电路级310更靠近电磁致动设备100。
图4A示出了根据本公开的实施方式的过电流保护装置300的等效电路图。
如图4A所示，根据本公开的实施方式，放电电路级310包括第一放电电路级3101和第二放电电路级3102。
如图4A所示，根据本公开的实施方式，第一放电电路级3101并联连接在电磁致动设备100的电流输入端口IN和电流输出端口OUT之间并且包括气体放电管G1和G2。如图4A所示，根据本公开的实施方式，气体放电管G1连接在电流输入端口IN和第一节点N1之间，而气体放电管G2连接在电流输出端口OUT和第一节点N1之间，用于在电流输入端口IN和电流输出端口OUT之间的电流路径中出现诸如雷击或电源故障引起的过电流时，将过电流释放到地GND。
气体放电管(Gas Discharge Tube)是一种间歇型的保护器件，其极间绝缘电阻很大，寄生电容很小。当在气体放电管两极之间施加一定电压时，在极间产生不均匀电场。在此电场作用下，气体放电管内的气体(通常为空气或惰性气体)开始游离。当外加电压增大到使极间场强超过气体的绝缘强度时，两极之间的间隙将被放电击穿，由原来的绝缘状态转化为导电状态。在导通之后，气体放电管两极之间的电压维持在放电弧道所决定的残压水平，该残压通常很低，使得与气体放电管并联的电磁致动设备免受各种浪涌脉冲的损坏。鉴于气体放电管是本领域技术人员熟知的器件，因此为简洁起见，这里不对气体放电管的细节进行更详细的描述。
如图4A所示，根据本公开的实施方式，第二放电电路级3102并联连接在电磁致动设备100的电流输入端口IN和电流输出端口OUT之间并且包括压敏电阻器RV1和RV2。如图4A所示，根据本公开的实施方式，压敏电阻器RV1连接在电流输入端口IN和第一节点N1之间，而压敏电阻器RV2连接在电流输出端口OUT和第一节点N1之间，用于在电流输入端口IN和电流输出端口OUT之间的电流路径中出现诸如雷击或电源故障引起的过电流时，将过电流释放到地GND。
压敏电阻器是一种非线性电阻元件。压敏电阻器的阻值与两端施加的电压大小有关。当施加到压敏电阻器上的电压在其标称值以内时，电阻器的阻值呈现无穷大状态，几乎无电流通过。当压敏电阻器两端的电压略大于标称电压时，压敏电阻迅速击穿导通，其阻值很快下降，使电阻器处于导通状态，因此可以有效地保护电磁致动设备免受各种浪涌脉冲的损坏。鉴于压敏电阻器是本领域技术人员熟知的器件，因此为简洁起见，这里不对压敏电阻器的细节进行更详细的描述。
如图4A所示，根据本公开的实施方式，第一放电电路级3101和第二放电电路级3102经由共同的放电元件接地。如图4A所示，第一放电电路级3101和第二放电电路级3102均连接到第一节点N1。如图4A所示，例如，气体放电管G3可以作为放电元件连接在第一节点N1和地GND之间。
根据本公开的替选实施方式，第一放电电路级3101和第二放电电路级3102也可以经由各自的放电元件接地。图4B示出了根据本公开的替选实施方式的过电流保护装置400的等效电路图。图4B中的与图4A中的部件相同的部件由相同的附图标记表示，并且本文将省略重复性的描述。
如图4B所示，根据本公开的替选实施方式，第一放电电路级3101经由作为第一放电电路级3101的放电元件的气体放电管G3接地，而第二放 电电路级3102经由作为第二放电电路级3102的放电元件的压敏电阻器RV3接地。具体地，如图4B所示，气体放电管G3可以作为第一放电电路级3101的放电元件连接在第一节点N1和地GND之间，而压敏电阻器RV3可以作为第二放电电路级3102的放电元件连接在第二节点N2和地GND之间。
如图4A和图4B所示，根据本公开的实施方式，限位电路级320并联连接在电流输入端口IN和电流输出端口OUT之间，并且包括第一瞬态抑制二极管T1和第二瞬态抑制二极管T2。如图4A和图4B所示，根据本公开的实施方式，第一瞬态抑制二极管T1和第二瞬态抑制二极管T2可以并联连接在电流输入端口IN和电流输出端口OUT之间。
瞬态抑制二极管(Transient Voltage Suppressor)是一种二极管形式的高效能保护器件。当瞬态抑制二极管的两极受到反向瞬态高能量冲击时，能够在极短的时间内将其两极间的高阻抗变为低阻抗并且吸收高达数千瓦的浪涌功率，使两极间的电压箝位于一个预定值，以有效地保护电磁致动设备免受各种浪涌脉冲的损坏。鉴于瞬态抑制二极管是本领域技术人员熟知的器件，因此为简洁起见，这里不对瞬态抑制二极管的细节进行更详细的描述。
本领域技术人员应认识到，尽管本文以两个串联连接的瞬态抑制二极管作为优选实施方式描述了限位电路级320，但是本公开不限于此。限位电路级320可以仅包括一个瞬态抑制二极管。然而，使用两个或更多个串联连接的瞬态抑制二极管可以实现冗余设计。也就是说，如果两个瞬态抑制二极管中的一个被击穿短路，另一个仍可以保证正常工作，从而保证电磁致动设备被正常供电以维持正常动作。
通常，由气体放电管G1和G2构成的第一放电电路级3101释放过电流的能力强于由压敏电阻器RV1和RV2构成的第二放电电路级3102释放过电流的能力，而由压敏电阻器RV1和RV2构成的第二放电电路级3102释放过电流的能力强于由第一瞬态抑制二极管T1和第二瞬态抑制二极管T2构成的限位电路级320释放过电流的能力。因此，根据本公开的实施方式，将放电电路级310设置在限位电路级320的前端。此外，根据本公开的实施方式，将由气体放电管G1和G2构成的第一放电电路级3101设置在由压敏电阻器RV1和RV2构成的第二放电电路级3102的前端。换言之，根据本公开的实施方式，电路级释放过电流能力越强，其设置的位置越远离电磁致动设备，以便于有效地防止由于诸如雷击或电源故障引起的 过电流对电磁致动设备造成损害。
在图4A和图4B所示的过电流保护装置300和400中，第一放电电路级3101的气体放电管G1和G2释放绝大部分过电流，第二放电电路级3102的压敏电阻器RV1和RV2释放剩余的过电流中的大部分，使得仅有少部分过电流进入限位电路级320的第一瞬态抑制二极管T1和第二瞬态抑制二极管T2，由第一瞬态抑制二极管T1和第二瞬态抑制二极管T2释放并且进行钳位。
如图4A和图4B所示，根据本公开的实施方式，衰减电路级330串联连接在电流输入端口IN和电流输出端口OUT之间的电流路径中，并且包括第一衰减电路级3301和第二衰减电路级3302。
如图4A和图4B所示，根据本公开的实施方式，第一衰减电路级3301设置在第一放电电路级3101和第二放电电路级3102之间，并且包括与电流输入端口IN串联连接的第一电阻器R1和与电流输出端口OUT串联连接的第二电阻器R2。
如图4A和图4B所示，根据本公开的实施方式，第二衰减电路级3302设置在第二放电电路级3102和限位电路级320之间，并且包括与第一电阻器R1串联连接的第三电阻器R3和与第二电阻器R2串联连接的第四电阻器R4。
根据本公开的实施方式，构成衰减电路级330的第一至第四电阻器R1、R2、R3和R4可以是解耦电阻器，例如低阻值的绕线电阻器，使得在分级衰减过电流的同时不影响正常操作时提供给电磁致动设备100的控制电流。此外，第一至第四电阻器R1、R2、R3和R4采用低阻值的绕线电阻器可以提高电流输入端口IN和电流输出端口OUT之间的电流路径中的浪涌电流通过能力，进而保证电路级之间的电阻器的使用寿命。
本领域技术人员应认识到，图4A和图4B中示出的过电流保护装置300和400的电路拓扑仅是本公开的实施方式的一个具体示例，但是本公开不限于此。本领域技术人员根据本公开的教导，在不偏离本公开的精神和范围的情况下可以进行各种修改和变型。例如，过电流保护装置300和400中包括的放电电路级310、限位电路级320和衰减电路级330的数量可以根据设计需要被任意设定。此外，构成放电电路级310、限位电路级320和衰减电路级330的电子元件的数量可以根据设计需要被任意设定。此外，构成放电电路级310、限位电路级320和衰减电路级330的电子元件 可以使用除上文描述的气体放电管、压敏电阻器和瞬态抑制二极管之外的能够实现相似功能的保护器件。此外，放电电路级310、限位电路级320和衰减电路级330之间的相对位置关系可以任意调整，只要限位电路级320作为最后端的电路级直接与电磁致动设备100并联连接即可。
返回参照图2，在图2所示的根据现有技术的过电流保护装置中，当出现过电流时，流过过电流保护装置的过电流I1和流过电磁致动设备的过电流I2几乎相同，因此电磁致动设备可能不能得到充分的保护而被损坏。
作为对比，图4A和图4B所示的根据本公开的实施方式的过电流保护装置300和400具有用于释放过电流的三个电路级，即第一放电电路级3101、第二放电电路级3102和限位电路级320。因此，当出现过电流时，可以逐级抑制降低过电流，使得到达电磁致动设备的过电流极小，从而有效地保障电磁致动设备的使用寿命。如图4A和图4B所示，如上文所述，流过第一放电电路级3101的过电流I1远大于流过第二放电电路级3102的过电流I2，过电流I2远大于流过限位电路级320的过电流I3，而过电流I3远大于流过电磁致动设备的过电流I4。
此外，在图2所示的根据现有技术的过电流保护装置中，瞬态抑制二极管设置在最前端的电路级中，其过电流水平较高，易造成损坏从而短路。作为对比，在图4A和图4B所示的根据本公开的实施方式的过电流保护装置300和400中，瞬态抑制二极管设置在最后端的电路级中，过电流经过前端的两个电路级的释放已经降至较低的水平，因此瞬态抑制二极管完全能够执行较低过电流的释放和拑压。也就是说，较之根据现有技术的过电流保护装置，根据本公开的实施方式的过电流保护装置在标称放电电流范围内避免了出现诸如信号短路的故障现象。
此外，在图2所示的根据现有技术的过电流保护装置中，串接在电流路径中的元件例如导线或电阻器可能因过电流烧毁，从而导致电流路径断开。作为对比，在图4A和图4B所示的根据本公开的实施方式的过电流保护装置300和400中，由于使用三个电路级的保护结构，极大地降低了电路级之间的过电流水平，从而提高了电流路径的耐受能力，降低了导线或电阻器烧毁的几率。也就是说，较之根据现有技术的过电流保护装置，根据本公开的实施方式的过电流保护装置在标称放电电流范围内避免了出现诸如信号断路的故障现象。
根据本公开的实施方式，过电流保护装置可以与电磁致动设备例如防爆电磁阀集成。根据本公开的实施方式，过电流保护装置可以设置在印刷 电路板上，以内部安装的方式集成到防爆电磁阀中，用于防止诸如雷击或电源故障引起的过电流对电磁致动设备造成损害。
图5示出了根据本公开的实施方式的防爆电磁阀500的透视图。图6示出了根据本公开的实施方式的防爆电磁阀500的分解透视图。图7示出了根据本公开的实施方式的防爆电磁阀500的截面视图。
如图5至图7所示，根据本公开的实施方式，防爆电磁阀装置500可以包括下壳体501、电磁阀502、印刷电路板503和上壳体504。
如图5至图7所示，电磁阀502可以包括阀体5021、电磁线圈5022、动铁芯5023和底座5024。鉴于电磁阀是本领域技术人员熟知的电磁致动设备，因此为简洁起见，这里不对电磁阀的细节进行更详细的描述。
如图5至图7所示，根据本公开的实施方式，电磁阀502可以容纳在下壳体501中。根据本公开的实施方式，印刷电路板503设置在电磁阀502上，并且设置有如上文结合图4A和图4B描述的根据本公开的实施方式的过电流保护装置。根据本公开的实施方式，设置有过电流保护装置的印刷电路板503耦接至电磁阀502并且防止诸如雷击或电源故障引起的过电流对电磁阀502造成损害。
根据本公开的实施方式，如上文结合图4A和图4B描述的根据本公开的实施方式的过电流保护装置可以被配置成通过印刷电路板的形式实现。
根据本公开的实施方式，印刷电路板503可以具有至少两层布线，用于保证其高度和宽度可控，结构紧凑。此外，根据本公开的实施方式，印刷电路板503可以设置有用于保护过电流保护装置的保护罩。根据本公开的实施方式，该保护罩可以由环氧树脂制成。通过在印刷电路板503上使用环氧树脂密封过电流保护装置，可以使过电流保护装置的电子元件与电磁阀502的电磁线圈5202等部件完全物理隔离，在保证自身温度性能的同时不会对电磁线圈502的性能造成不利影响。
如图5至图7所示，根据本公开的实施方式，上壳体504与下壳体501配合以形成容纳电磁阀502和印刷电路板503的防爆空腔。如图5至图7所示，根据本公开的实施方式，上壳体504与下壳体501之间的配合可以通过螺钉505实现。
根据本公开的过电流保护装置，通过在电源和电磁致动设备之间设置放电电路级、限位电路级和衰减电路级为电磁致动设备提供了多层过电流保护，从而增强了对过电流的耐受能力并且延长了使用寿命。
根据本公开的过电流保护装置，通过将用于释放过电流的放电电路级和限位电路级与电磁致动设备并联连接，即使在过电流保护装置出现故障时仍不影响电磁致动设备的正常工作，从而提高了可靠性。
根据本公开的防爆电磁阀，通过将过电流保护装置集成在防爆电磁阀中，可以作为整体进行防爆认证，有利于彼此兼容，能够极大地简化安装过程。
根据本公开的防爆电磁阀，将过电流保护装置设置在印刷电路板上并且内置集成在防爆电磁阀中，并且使过电流保护装置的电子元件与电磁阀的电磁线圈物理隔离，从而在保证自身的温度性能的同时避免对电磁线圈的性能造成不利影响。
尽管上面已经通过对本公开的具体实施方式的描述对本公开进行了披露，但是，应该理解，本领域的技术人员可在所附权利要求的精神和范围内设计对本公开的各种修改、改进或者等同物。这些修改、改进或者等同物也应当被认为包括在本公开的保护范围内。

Claims (17)

  1. 一种用于电磁致动设备的过电流保护装置，包括：
    至少一个放电电路级，被配置成并联连接在所述电磁致动设备的电流输入端口和电流输出端口之间，用于释放过电流；
    至少一个限位电路级，被配置成并联连接在所述电流输入端口和所述电流输出端口之间，用于对所述电流输入端口和所述电流输出端口之间的电压进行限位并且释放过电流；以及
    至少一个衰减电路级，被配置成串联连接在所述电磁致动设备的电流输入端口和电流输出端口之间的电流路径中，用于衰减所述电流路径中的过电流，
    其中，所述限位电路级较之所述衰减电路级和所述放电电路级更靠近所述电磁致动设备。
  2. 根据权利要求1所述的过电流保护装置，其中，所述至少一个放电电路级经由共同的放电元件接地。
  3. 根据权利要求1所述的过电流保护装置，其中，所述至少一个放电电路级经由各自的放电元件接地。
  4. 根据权利要求2所述的过电流保护装置，其中，所述放电元件是气体放电管。
  5. 根据权利要求1至4中任一项所述的过电流保护装置，其中，所述至少一个放电电路级包括第一放电电路级和第二放电电路级，以及
    其中，所述衰减电路级还设置在所述第一放电电路级和所述第二放电电路级之间。
  6. 根据权利要求5所述的过电流保护装置，其中，所述第一放电电 路级和所述第二放电电路级中的每一个包括气体放电管和/或压敏电阻器。
  7. 根据权利要求1至6中任一项所述的过电流保护装置，其中，所述至少一个限位电路级包括至少一个瞬态抑制二极管。
  8. 根据权利要求7所述的过电流保护装置，其中，所述至少一个限位电路级包括串联连接的两个瞬态抑制二极管。
  9. 根据权利要求1至8中任一项所述的过电流保护装置，其中，所述至少一个衰减电路级包括电阻器。
  10. 根据权利要求9所述的过电流保护装置，其中，所述电阻器是绕线电阻器。
  11. 根据权利要求1至10中任一项所述的过电流保护装置，其中，所述过电流保护装置设置在印刷电路板上。
  12. 根据权利要求11所述的过电流保护装置，其中，所述印刷电路板具有至少两层布线。
  13. 根据权利要求11或12所述的过电流保护装置，其中，所述印刷电路板上设置有用于保护所述过电流保护装置的保护罩。
  14. 根据权利要求13所述的过电流保护装置，其中，所述保护罩由环氧树脂制成。
  15. 根据权利要求1所述的过电流保护装置，其中，所述电磁致动设备是电磁阀，以及
    其中，所述过电流保护装置被配置成防止由雷击或电源故障引起的过电流对所述电磁阀造成损害。
  16. 一种防爆电磁阀装置，包括：
    电磁阀；
    根据权利要求1至15中任一项所述的过电流保护装置，被配置成耦接至所述电磁阀并且防止过电流对所述电磁阀造成损害；以及
    防爆壳体，被配置成容纳所述电磁阀和所述电流保护装置。
  17. 一种防爆电磁阀装置，包括：
    下壳体；
    电磁阀，容纳在所述下壳体中；
    印刷电路板，设置在所述电磁阀上；以及
    上壳体，被配置成与所述下壳体配合以形成容纳所述电磁阀和所述印刷电路板的防爆空腔，
    其中，所述印刷电路板上设置有根据权利要求1至15中任一项所述的过电流保护装置，其被配置成耦接至所述电磁阀并且防止过电流对所述电磁阀造成损害。
PCT/CN2023/072245 2022-01-17 2023-01-16 过电流保护装置和集成有该过电流保护装置的防爆电磁阀 WO2023134760A1 (zh)

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