CN220570065U

CN220570065U - Electrical control box

Info

Publication number: CN220570065U
Application number: CN202321597112.0U
Authority: CN
Inventors: 姚奎; 陈征; 况力源
Original assignee: Chongqing Three Gorges Water Fuling Drainage Co ltd
Current assignee: Chongqing Three Gorges Water Fuling Drainage Co ltd
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2024-03-08
Anticipated expiration: 2033-06-21

Abstract

The utility model discloses an electric control box, wherein a limit switch capable of being triggered and reset along with the closing and opening of a box door is arranged in the box body, and the on-off of a control circuit is switched through the limit switch; when the box door is closed, the limit switch is triggered, and the control circuit is conducted; when the box door is opened, the limit switch is reset, and the control circuit is disconnected; the limit switch is utilized to realize electrical interlocking, when the box door is abnormally opened in the running process of a power distribution object, the limit switch resets to cut off the control circuit, so that the control circuit is invalid, the equipment stops running, and the situation that the damage to the power distribution object or the safety accident occurs due to the fact that the box door is randomly opened and the internal power distribution equipment is operated can be effectively avoided; in addition, in the state that the box door is opened, the control circuit cannot work normally, so that the condition that the box door is forgotten to be closed after debugging is finished can be effectively avoided; the problem that the safety and reliability of the existing electrical control box are poor can be effectively solved.

Description

Electrical control box

Technical Field

The utility model belongs to the technical field of cabinets of electric equipment in electricity, and particularly relates to an electric control cabinet.

Background

The electric control box is generally used for power, illumination power distribution and motor control, is widely applied to occasions such as factories and mines, enterprises, markets, hotels, schools, airports, ports, hospitals, high-rise buildings, living communities and the like, and is internally provided with a control circuit formed by connecting one or more low-voltage switches and related power distribution equipment such as control, measurement, signals, protection, adjustment and the like.

The electric control box generally comprises a box body, a box door and a wiring board which is arranged in the box body and used for installing and connecting power distribution equipment, wherein the box door is hinged to one side edge of an opening surface of the box body so as to realize opening and closing of the electric control box, and wires connected to the wiring board penetrate through wire passing holes formed in the box body and are connected with the outside so as to realize transmission of input and output signals. In order to avoid the situation that the electric control box is opened by a person at will, the internal power distribution equipment is operated, the power distribution object is damaged or a safety accident occurs, a door lock is generally arranged on the door of the existing electric control box, a key of the door lock is stored by an installer or a user, and when the electric control box needs to be opened for power distribution debugging or maintenance, a worker who obtains the key performs the box opening operation, so that the occurrence of the situation can be effectively avoided. However, in actual use, the situation that the door is forgotten to be closed or the key is forgotten to be lost and cannot be locked after debugging is completed often occurs, the electric control box possibly enters water due to the fact that the door is forgotten to be closed, internal power distribution equipment is short-circuited, the internal power distribution equipment is exposed in a high-temperature or damp-heat environment for a long time and can be aged and damaged, in addition, the door is forgotten to be closed or the key is forgotten to be lost and cannot be locked, and the electric control box is in an unsafe state which can be opened by people at will.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide an electric control box, solve the technical problems of poor safety and reliability of the existing electric control box and obtain the effect of improving the use safety of the electric control box.

In order to solve the technical problems, the utility model adopts the following technical scheme:

an electric control box comprises a box body with an opening on one side, wherein a box door is hinged to one side edge of the opening surface of the box body, and a control circuit is arranged in the box body; the limit switch is arranged in the box body and triggered in a box door closing state, and the limit switch is electrically connected with the control circuit and can disconnect the control circuit when the limit switch resets.

Further, the limit switch is a contact limit switch, and the limit switch is fixedly arranged on any side surface in the box body and is close to the opening surface of the box body; when the box door is opened, the contact of the limit switch extends out of the box body from the opening surface of the box body, and the limit switch is in a reset state; and in the state that the box door is closed, the contact of the limit switch is abutted with the box door and the limit switch is triggered.

Further, a limit circuit adopting direct current 12v is also arranged in the box body, the contact of the limit switch is a normally closed contact, the contact of the limit switch and the intermediate relay are connected in series on the limit circuit, and the normally closed contact of the intermediate relay is connected in series on the control circuit.

Further, the limit circuit comprises a first branch and a second branch which are connected in parallel, the contact of the limit switch and the intermediate relay are connected in series on the first branch, the second branch is connected in series with the normally open contact of the LED lamp tube and the intermediate relay, and the LED lamp tube is positioned in the box body.

Further, a switching power supply connected in parallel with the control circuit is further arranged in the box body, the specification of the switching power supply is AC220V to DC12V, and the head end and the tail end of the limiting circuit are respectively connected with the positive electrode output end and the negative electrode output end of the switching power supply.

Further, the control circuit is further connected with a normally-closed button switch, a normally-open button switch and a contactor in series, a normally-open auxiliary contact of the contactor is connected with the normally-open button switch in parallel to form self-locking, a normally-open main contact of the contactor is connected with the power supply circuit of the electric control box corresponding to the power distribution object in series, and the normally-closed button switch and the normally-open button switch are located on one face of the box door facing outwards.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the limit switch is used for realizing electrical interlocking, and when the box door is abnormally opened in the running process of a power distribution object, the limit switch resets to cut off the control circuit, so that the control circuit is invalid, the equipment stops running, and the situation that the power distribution object is damaged or a safety accident occurs due to the fact that the box door is randomly opened and the internal power distribution equipment is operated can be effectively avoided; in addition, in the state that the box door is opened, the control circuit cannot work normally, so that the condition that the box door is forgotten to be closed after debugging is finished can be effectively avoided; the problem that the safety and the reliability of the existing electrical control box are poor can be effectively solved, and the effect of improving the use safety of the electrical control box is achieved.

Drawings

FIG. 1 is a schematic view of a door of an electrical control box in an open state;

FIG. 2 is a schematic diagram of a door closing state of an electric appliance control box according to an embodiment;

FIG. 3 is a schematic diagram of the internal circuitry of an embodiment electrical control box and the power supply circuitry of the power distribution object;

the door lock comprises a limit switch 1, a box body 2, an LED lamp tube 3, a box door 4, a door lock 5, a normally closed button switch 6 and a normally open button switch 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Examples:

referring to fig. 1 and 2, an electrical control box comprises a box body 2 with an opening on one side, wherein a box door 4 is hinged to one side edge of the opening surface of the box body 2, the box door 4 can rotate to be close to the opening surface of the box body 2 and can cover the opening surface of the box body 2 to realize opening and closing of the electrical control box, and a door lock 5 is arranged on the box door 4; the box body 2 is internally provided with a control circuit which is electrically connected with a power supply circuit of a power distribution object corresponding to the electric control box;

the limit switch 1 is arranged in the box body 2, the limit switch 1 is electrically connected with the control circuit, the limit switch 1 is triggered along with the closing of the box door 4 and enables the control circuit to be conducted, the limit switch 1 resets along with the opening of the box door 4 and enables the control circuit to be disconnected, namely the closing and the opening of the box door 4 are in one-to-one correspondence with the triggering and the resetting of the limit switch 1;

in implementation, the limit switch 1 can be a contact type or non-contact type limit switch 1, the limit switch 1 is arranged on any side surface in the box body 2, a contact or a detection end of the limit switch faces the opening surface of the box body 2, and the box door 4 is closed to trigger the limit switch; in the embodiment, a contact type limit switch 1 is adopted, the limit switch 1 is fixedly arranged on the side surface of the box body 2, which is far away from the edge where the box door 4 is hinged with the box body 2, and the contact of the limit switch 1 faces towards and is close to the opening surface of the box body 2; in the state that the box door 4 is opened, the contact of the limit switch 1 extends out of the box body 2 from the opening surface of the box body 2, and the limit switch 1 is in a reset state; in the state that the box door 4 is closed, the contact of the limit switch 1 is abutted with the box door 4 and triggers the limit switch 1.

According to the electric control box, a limit switch 1 capable of being triggered and reset along with the closing and opening of a box door 4 is arranged in a box body 2, and the on-off of a control circuit is switched through the limit switch 1; when the box door 4 is closed, the limit switch 1 is triggered, the control circuit is conducted, and the control circuit works normally to realize the corresponding power distribution function; when the box door 4 is opened, the limit switch 1 is reset, the control circuit is disconnected, and the control circuit stops working; according to the utility model, the limit switch 1 is utilized to realize electrical interlocking, and when the box door 4 is abnormally opened in the running process of a power distribution object, the limit switch 1 resets to cut off a control circuit, so that the control circuit is invalid, the equipment stops running, and the situation that the box door 4 is randomly opened, the internal power distribution equipment is operated, and the power distribution object is damaged or a safety accident occurs can be effectively avoided; in addition, in the state that the box door 4 is opened, the control circuit cannot work normally, so that the condition that the box door 4 is forgotten to be closed after debugging is finished can be effectively avoided; the problem that the safety and the reliability of the existing electrical control box are poor can be effectively solved, and the effect of improving the use safety of the electrical control box is achieved.

Referring to fig. 2 and fig. 3, in order to further improve the use safety and reliability of the electrical control box, a low-voltage direct current limit switch 1 is adopted to realize electrical interlocking, and correspondingly, a limit circuit adopting direct current 12v is also arranged in the box body 2, and the contact of the limit switch 1 is a normally closed contact, namely, when the limit switch 1 is triggered, the contact of the limit switch 1 is disconnected; the contact of the limit switch 1 and the intermediate relay are connected in series on the limit circuit, and the normally closed contact of the intermediate relay is connected in series on the control circuit;

in this embodiment, a switching power supply connected in parallel with a control circuit is disposed in the box 2, and a DC low voltage is provided for a limit circuit in the box 2 by using a switching power supply with a specification of AC220V to DC12V, where the head end and the tail end of the limit circuit are respectively connected with the positive output end and the negative output end of the switching power supply.

Referring to fig. 2 and 3, in order to facilitate the operation and maintenance of the power distribution equipment in the box 2 after the box door 4 is opened, an LED lamp 3 is further disposed in the box 2, and in order to realize that the LED lamp 3 is turned on along with the opening of the box door 4, the limit circuit includes a first branch and a second branch connected in parallel, the contact of the limit switch 1 and the intermediate relay are connected in series on the first branch, and the normally open contact of the LED lamp 3 and the intermediate relay are connected in series on the second branch.

Referring to fig. 2 and 3, in this embodiment, the power distribution object of the electrical control box is three motors, and the control circuit is provided with three control branches connected in parallel, and the three control branches are in one-to-one correspondence with the power supply circuits of the three motors; each control branch is connected with a normally-closed button switch 6, a normally-open button switch 7 and a contactor in series, a normally-open auxiliary contact of the contactor is connected with the normally-open button switch 7 in parallel to form self-locking, a normally-open main contact of the contactor is connected in series to a power supply circuit corresponding to a power distribution object, and the normally-closed button switch 6 and the normally-open button switch 7 are respectively used as a stop switch and a start switch and are both positioned on the outward side of the box door 4 so as to be convenient to operate.

For easy understanding, the working principle of the electric control box of the utility model is described as follows:

as shown in fig. 3, when the air-break switching power supplies QF1, QF2, QF3, QF4 and QF5 are turned on and the door of the electric control box is opened, the limit switch SQ is in a reset state, the contact of the limit switch SQ is in a closed state, the coil of the intermediate relay KA is electrified, the normally closed contact of the intermediate relay KA is disconnected, the control circuit is disconnected, and all three motors M1, M2 and M3 cannot be started to operate; meanwhile, the normally open contact of the intermediate relay KA is closed, the LED lamp tube is electrified to work, and illumination is provided for the box body, so that power distribution equipment in the box body can be debugged and maintained. When the door of the electric control box is closed, the contact of the limit switch SQ is in an open state, the coil of the intermediate relay KA is powered off, the normally closed contact of the intermediate relay KA is closed, a precondition is provided for the normal operation of the control circuit, the normally open button switch 1SB2, 2SB2 or/and 3SB2 is pressed down, the corresponding contactor KM1, KM2 or/and KM3 is powered on, the self-locking is completed through the corresponding normally open auxiliary contact, and the power supply circuit of the corresponding motor M1, M2 or/and M3 is conducted through the corresponding normally open main contact; meanwhile, a normally open contact of the intermediate relay KA is disconnected, the LED lamp tube is powered off, and the LED lamp tube stops working so as to save electric energy; in addition, when the box door is opened by a worker to maintain or adjust the power distribution equipment or the control circuit in the box body, the normally closed contact of the intermediate relay KA and the normally open auxiliary contact of the contactor can be closed by manual operation, so that the direct test operation can be performed under the condition that the box door is not closed.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the present utility model, and all such modifications and equivalents are included in the scope of the claims.

Claims

1. An electric control box comprises a box body with an opening on one side, wherein a box door is hinged to one side edge of the opening surface of the box body, and a control circuit is arranged in the box body; the method is characterized in that: the limit switch is arranged in the box body and triggered in a box door closing state, and the limit switch is electrically connected with the control circuit and can disconnect the control circuit when the limit switch resets.

2. An electrical control box as claimed in claim 1, wherein: the limit switch is a contact limit switch and is fixedly arranged on any side surface in the box body and is close to the opening surface of the box body; when the box door is opened, the contact of the limit switch extends out of the box body from the opening surface of the box body, and the limit switch is in a reset state; and in the state that the box door is closed, the contact of the limit switch is abutted with the box door and the limit switch is triggered.

3. An electrical control box as claimed in claim 1, wherein: the box body is also internally provided with a limit circuit adopting direct current 12v, the contact of the limit switch is a normally closed contact, the contact of the limit switch and the intermediate relay are connected in series on the limit circuit, and the normally closed contact of the intermediate relay is connected in series on the control circuit.

4. An electrical control box according to claim 3, characterized in that: the limit circuit comprises a first branch and a second branch which are connected in parallel, the contact of the limit switch and the intermediate relay are connected in series on the first branch, the second branch is connected in series with the normally open contact of the LED lamp tube and the intermediate relay, and the LED lamp tube is positioned in the box body.

5. An electrical control box according to claim 3, characterized in that: the box body is also internally provided with a switching power supply connected in parallel with the control circuit, the specification of the switching power supply is AC220V to DC12V, and the head end and the tail end of the limiting circuit are respectively connected with the positive electrode output end and the negative electrode output end of the switching power supply.

6. An electrical control box according to claim 3, characterized in that: the control circuit is also connected with a normally closed button switch, a normally open button switch and a contactor in series, a normally open auxiliary contact of the contactor is connected with the normally open button switch in parallel to form self-locking, a normally open main contact of the contactor is connected with the power supply circuit of the electric control box corresponding to the power distribution object in series, and the normally closed button switch and the normally open button switch are positioned on one face of the box door facing outwards.