阅读说明：本技术 一种防爆取电箱 (Explosion-proof electricity-taking box ) 是由 邵家辉 陆腾蛟 吴凡 于 2020-04-24 设计创作，主要内容包括：本发明涉及一种防爆取电箱,应用于易燃易爆场所的电器取电。包括箱体、箱盖,箱体内布置有电源插座、防爆磁控开关,防爆磁控开关,防爆磁控开关由常闭干簧管、永磁体、弹簧构成,电源插座的L端通过所述防爆磁控开关和火线相连,箱盖关闭时驱动所述永磁体远离所述常闭干簧管使防爆磁控开关处于导通状态从而使所述电源插座获电,箱盖打开后所述永磁体在弹簧的弹力下接近所述防常闭干簧管使所述防爆磁控开关处于开路状态从而使所述电源插座断电。(The invention relates to an explosion-proof electricity taking box which is applied to electricity taking of electrical appliances in flammable and explosive places. Including box, case lid, arranged supply socket, explosion-proof magnetic control switch in the box, explosion-proof magnetic control switch comprises normally closed tongue tube, permanent magnet, spring, and supply socket's L end passes through explosion-proof magnetic control switch links to each other with the live wire, drives when the case lid is closed the permanent magnet is kept away from thereby normally closed tongue tube makes explosion-proof magnetic control switch be in the conducting state messenger supply socket obtains the electricity, and the case lid is opened the back the permanent magnet is close under the elasticity of spring prevent that normally closed tongue tube makes explosion-proof magnetic control switch is in the state of opening a way thereby makes supply socket outage.)

1. The utility model provides an explosion-proof electricity box of getting, characterized by: including box, case lid, arranged supply socket, explosion-proof magnetic control switch in the box, explosion-proof magnetic control switch comprises normally closed tongue tube, permanent magnet, spring, and supply socket's L end passes through explosion-proof magnetic control switch links to each other with the live wire, drives when the case lid is closed the permanent magnet is kept away from thereby normally closed tongue tube makes explosion-proof magnetic control switch be in the conducting state messenger supply socket obtains the electricity, and the case lid is opened the back the permanent magnet is close under the elasticity of spring prevent that normally closed tongue tube makes explosion-proof magnetic control switch is in the state of opening a way thereby makes supply socket outage.

2. An explosion-proof electricity-taking box according to claim 1, characterized in that: the normally closed reed pipe is a vacuum normally closed reed pipe.

3. An explosion-proof electricity-taking box according to claim 2, characterized in that: the box body and the box cover are made of metal.

4. An explosion-proof electricity-taking box according to claim 1, 2 or 3, characterized in that: the explosion-proof magnetic control switch also comprises a current-limiting resistor and a bidirectional thyristor.

5. An explosion-proof electricity-taking box according to claim 1, 2 or 3, characterized in that: the explosion-proof magnetic control switch also comprises a current-limiting resistor, a bidirectional thyristor and a zero-crossing detection trigger module.

Technical Field

The invention relates to an explosion-proof electricity taking box which is applied to electricity taking of electrical appliances in flammable and explosive places.

Background

At the moment of inserting the electric appliance plug into the socket, because of a large contact resistance, sparks can be generated at a contact point and heat is generated, along with the stable contact of the plug and the socket contact, the sparks and the heat disappear, when the electric appliance plug is pulled out of the socket, the sparks can be generated at the moment of separating the contact points due to the existence of a load, and therefore, explosion accidents are easily caused by the sparks and the heat of the power supply contact points in flammable and explosive places. With the application of new technologies in petroleum and petrochemical industry, in particular to the application of information computers, such as: the problems of power taking and charging can be encountered in online analytical instruments, computers, PLC (programmable logic controller), operation stations, daily-used rechargeable flashlights, wireless interphones, notebook computers and the like, and because the existing charging adapters do not consider explosion-proof design (or cannot carry out explosion-proof design), contact sparks can be generated in the moment of inserting or pulling out a socket, and if the charging adapters are directly used in an explosion-proof area, explosion accidents are easily caused.

The present invention relates to an explosion-proof method, including isolation explosion-proof method and intrinsic safety explosion-proof method, in which the isolation explosion-proof method adopts metal container to make electric spark implement closed isolation, and the intrinsic safety explosion-proof method can be designed to prevent electric spark from producing.

The inventor of the present invention previously applies 2014100158119 to an explosion-proof electricity-taking box, discloses a technical scheme of adopting a normally open reed switch, and discloses a technical scheme of a normally closed reed switch, wherein the technical scheme has the advantage that a control system can be integrated into one component, so that the production and the installation are simplified.

Disclosure of Invention

The idea of the invention is as follows: when the plug is inserted into the socket or pulled out of the socket, the socket is in a power-off state, so that electric sparks are avoided, and the intrinsic safety explosion-proof effect is achieved.

The explosion-proof electricity-taking box is a box or a box and can accommodate one or more sockets.

The technical scheme of the invention is as follows:

the utility model provides an explosion-proof electricity box of getting, characterized by: including box, case lid, arranged supply socket, explosion-proof magnetic control switch in the box, explosion-proof magnetic control switch comprises normally closed tongue tube, permanent magnet, spring, and supply socket's L end passes through explosion-proof magnetic control switch links to each other with the live wire, drives when the case lid is closed the permanent magnet is kept away from thereby normally closed tongue tube makes explosion-proof magnetic control switch be in the conducting state messenger supply socket obtains the electricity, and the case lid is opened the back the permanent magnet is close under the elasticity of spring prevent that normally closed tongue tube makes explosion-proof magnetic control switch is in the state of opening a way thereby makes supply socket outage.

The explosion-proof electricity-taking box is characterized in that: the normally closed reed pipe is a vacuum normally closed reed pipe.

The explosion-proof electricity-taking box is characterized in that: the explosion-proof magnetic control switch also comprises a current-limiting resistor and a bidirectional thyristor.

The explosion-proof electricity-taking box is characterized in that: the explosion-proof magnetic control switch also comprises a current-limiting resistor, a bidirectional thyristor and a zero-crossing detection trigger module.

The explosion-proof electricity-taking box is characterized in that: the box body and the box cover are made of metal.

The invention has the beneficial effects that: 1. the electric connection contact of the reed switch is isolated from the outside in a reed switch sealing environment (particularly a vacuum reed switch and a non-ferromagnetic metal shell reed switch), the reed switch is explosion-proof, and the power socket is in a power-off state when a plug is inserted into or pulled out of the power socket, so that electric sparks are not generated, and the intrinsic safety explosion-proof effect is achieved. 2. The magnetic control switch mode of the bidirectional thyristor is controlled by the reed switch, and the bidirectional thyristor is a high-power contactless switch and can realize high-power electricity taking. 3. A zero-crossing detection trigger module is further added, so that the possibility of electric sparks caused by power on and power off is further eliminated.

Drawings

Fig. 1 is a structural schematic diagram of an explosion-proof electricity-taking box.

Fig. 2 is a schematic diagram of the structure of the explosion-proof magnetic control switch.

Fig. 3 is a circuit schematic diagram of a normally closed reed switch.

Fig. 4 is a schematic circuit diagram of an embodiment of an explosion-proof magnetic control switch using a normally closed reed switch and a bidirectional thyristor.

Fig. 5 is a schematic circuit diagram of an embodiment of the zero-crossing detection trigger module added to the embodiment of fig. 4.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a structural schematic diagram of an explosion-proof electricity-taking box. The explosion-proof electricity-taking box comprises a box body 10, a box cover 11 and a rotating shaft 12, wherein the box cover 11 can open and close the box body 10 through the rotating shaft 12; the power socket 40 and the explosion-proof magnetic switch 100 are arranged in the box body 10. The zero line and the ground line of the power supply are respectively connected with the N, E terminal of the power socket 40, and the live line of the power supply is connected with the L terminal of the power socket through the explosion-proof magnetic control switch 100. When the box cover 11 is opened, the explosion-proof magnetic control switch 100 is in an open circuit state, no electricity is applied to the power socket 40, no electric spark is generated in the power socket when a plug is inserted, the box cover 11 is closed after the plug is stably inserted, the box cover touches the explosion-proof magnetic control switch 100 and keeps in a touch closing state (the box cover can be stably fastened on the box body by arranging the existing scheme such as a lock catch and the like), the explosion-proof magnetic control switch 100 is closed to enable the power socket 40 to be electrified, the electric spark cannot be generated or the electric spark is isolated when the explosion-proof magnetic control switch 100 is closed and disconnected, therefore, the electricity taking process is intrinsically safe and explosion-proof, when the box cover 11 is opened, the box cover 11 is far away from the explosion-proof magnetic control switch 100, the circuit of the explosion-proof magnetic control switch 100 is opened to enable the power socket 40 to. And 13 is a plug wire outlet.

The definition of the explosion-proof magnetic control switch is as follows: the switch is controlled by magnetic field, and no electric spark is generated when the switch is turned on or off, or the generated electric spark is isolated in a closed space, such as a contactless switch and a reed switch.

In order to further improve the explosion-proof requirement, the box body and the box cover are made of metal.

Fig. 2 is a schematic diagram of the structure of the explosion-proof magnetic control switch. The explosion-proof magnetic switch 100 comprises a shell 20, wherein a spring 21, a permanent magnet 22, a normally closed reed pipe 23 and a touch part 24 are arranged in the shell 20, when a box cover 11 is opened, the touch part is popped out of the shell 20 by the spring 21, meanwhile, the permanent magnet 23 is abutted against the normally closed reed pipe 23 by the elastic force of the spring 21 to open the circuit, when the box cover 11 is closed, the touch part 24 is touched and pressed, and simultaneously, the permanent magnet 22 is driven to be far away from the normally closed reed pipe 23 to enable the normally closed reed pipe 23 to lose the magnetic field and close the normally. A. And B is the terminal of the explosion-proof magnetic switch 100. The normally closed reed switch can be selected from a vacuum reed switch and an aluminum shell reed switch, and the reed switch is used as a switch device, so that on one hand, the reed switch is explosion-proof, and in addition, the contact of the reed switch is directly connected, therefore, the normally closed reed switch is suitable for any capacitive or inductive load, and the power is generally less than 1000W.

Fig. 3 is a circuit schematic diagram of a normally closed reed switch. The permanent magnet 22 is in an open state when approaching the normally closed reed pipe 23, and the permanent magnet 22 is in a closed state when departing from the normally closed reed pipe 23.

Fig. 4 is a schematic circuit diagram of an embodiment of an explosion-proof magnetic control switch using a normally closed reed switch and a bidirectional thyristor. In fig. 4, the explosion-proof magnetic switch is composed of a normally closed reed pipe 23, a current limiting resistor 50 and a bidirectional thyristor 51, wherein the on/off of the bidirectional thyristor 51 is realized by controlling a control grid G end of the bidirectional thyristor by the normally closed reed pipe 23, and the on/off of the normally closed reed pipe is controlled by touching a permanent magnet by a box cover. The beneficial effect of this scheme is that the control current of normally closed reed switch is very small, generally does not produce the electric spark (even produce the electric spark also to be isolated, it is intrinsically safe explosion-proof), and the bidirectional thyristor is the contactless on, off switch, so can not produce the electric spark. In addition, the switching power of the scheme can be large, and can be more than 1000W, and the defect is that the scheme is suitable for capacitive loads. The L end of the power socket 40 is connected with a live wire through a bidirectional thyristor 51, a control grid G of the bidirectional thyristor 51 is connected with a normally closed reed pipe 23 and a current-limiting resistor 50, when the box cover is closed, the permanent magnet is far away from the normally closed reed pipe to enable the normally closed reed pipe to be in a conducting state so as to enable the bidirectional thyristor 51 to be conducted and enable the power socket 40 to be electrified, and when the box cover is opened, the permanent magnet is close to the normally closed reed pipe to enable the normally closed reed pipe to be in an open circuit state so as to enable the bidirectional thyristor 51 to be blocked and enable the power.

Fig. 5 is a schematic circuit diagram of an embodiment of the zero-crossing detection trigger module added to the embodiment of fig. 4. In fig. 5, 60 is a zero-crossing detection trigger module, which is used to implement zero-crossing triggering of the triac, i.e. the conduction and disconnection are exactly the time points when the ac voltage is zero, so that the possibility of generating electric sparks is lower. The L end of the power socket is connected with a live wire through a bidirectional thyristor 51, a control grid G of the bidirectional thyristor 51 is connected with a normally closed reed pipe 23, a current-limiting resistor 50 and a zero-crossing detection triggering module 60, when the box cover is closed, the permanent magnet leaves the normally closed reed pipe to enable the normally closed reed pipe to be in a conducting state so as to enable the bidirectional thyristor 51 to be in zero-crossing conduction and enable the power socket 40 to be electrified, and when the box cover is opened, the permanent magnet approaches the normally closed reed pipe to enable the normally closed reed pipe to be in an open-circuit state so as to enable the bidirectional thyristor 51 to be in zero-.

Further, the bidirectional controllable silicon can be replaced by a field effect transistor (IGBT).