CN217847718U - Automatic protection switch of low-voltage apparatus - Google Patents

Abstract

The utility model discloses an automatic protection switch of low-voltage apparatus, include: the circuit board comprises a shell, a first terminal and a second terminal, wherein a working cavity is formed in the shell, the first terminal and the second terminal are arranged on the shell, and the first terminal and the second terminal extend into the working cavity; the switch assembly comprises a reset part, a movable contact part and a static contact part; reset portion, move contact site and quiet contact site and all set up in the work chamber, move contact site and first wiring end electric wire connection, quiet contact site and second wiring end electric connection. The utility model controls the connectivity between the movable contact part and the static contact part through the reset part, and ensures the circuit communication between the first wiring end and the second wiring end; the reset part can adjust the connection relation between the movable contact part and the static contact part, and on one hand, the reset part can manually disconnect a circuit between the first terminal and the second terminal; on the other hand, the tripped circuit can be manually adjusted. Meanwhile, the structure is simple, and batch processing and production are convenient.

Description

Automatic protection switch of low-voltage apparatus

Technical Field

The utility model relates to a low-voltage apparatus technical field especially relates to a low-voltage apparatus's automatic protection switch.

Background

The low-voltage electrical appliance is an element or equipment which can be manually or automatically switched on and off according to external signals and requirements so as to realize switching, control, protection, detection, transformation and regulation of circuits or non-electric objects. The control devices can be divided into two types, i.e., high-voltage control devices and low-voltage control devices, according to the working voltage of the control devices, which is bounded by alternating current 1200V and direct current 1500V. Generally, low-voltage electrical appliances can be divided into two categories, namely distribution electrical appliances and control electrical appliances, and are basic constituent elements of a complete set of electrical equipment. In industry, agriculture, traffic, national defense and electricity utilization departments of people, low-voltage power supply is mostly adopted, so the quality of electrical components directly influences the reliability of a low-voltage power supply system.

In recent years, fuses or fuses used in low-voltage electric appliances in these fields are also in the form of air switches, and can be reset in time after a circuit failure is cleared in an emergency without requiring a spare part. However, the automatic protection switch named as a low-voltage electric device, which is disclosed as CN201066658Y in the prior art, has a complex structure, and is not suitable for mass production.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects of complex structure and unfavorable batch production in the prior art, and providing an automatic protection switch of a low-voltage apparatus.

In order to realize the purpose, the utility model adopts the following technical scheme:

an automatic protection switch for low-voltage electrical appliances, comprising: the automatic protection switch comprises a shell, a first wiring end and a second wiring end, wherein a working cavity is formed in the shell, the first wiring end and the second wiring end are arranged on the shell, the first wiring end and the second wiring end both extend into the working cavity, and the first wiring end and the second wiring end are used for wiring and circulating between a circuit of the automatic protection switch and an electrical appliance; the switch assembly comprises a reset part, a movable contact part and a static contact part; the reset part, the movable contact part and the static contact part are all arranged in the working cavity, the movable contact part is in electric wire connection with the first wiring terminal, the static contact part is electrically connected with the second wiring terminal, the reset part is positioned on one side above the movable contact part, and the reset part is used for controlling the on-off of a circuit between the static contact part and the movable contact part; and the shell cover is arranged on one side of the shell and is used for covering the working cavity.

Optionally, the movable contact part includes: the connecting plate is arranged on one side of the inner wall of the working cavity and is close to the resetting part; the insulating plate is arranged on the connecting plate, and one end of the insulating plate is connected with the reset part; the second spring is arranged on the connecting plate, one end of the second spring is connected with the connecting plate, and the other end of the second spring is connected with the inner wall of the working cavity; and the movable contact head is arranged on the insulating plate and is positioned at one end far away from the second spring, and the movable contact head is electrically connected with the first wiring end.

Optionally, the movable contact portion further includes a fixed connection end, the fixed connection end is disposed between the movable contact head and the first wiring end, and the first wiring end is electrically connected to the movable contact head through the fixed connection end.

Optionally, the stationary contact part includes: the supporting column is arranged in the working cavity and provided with a supporting groove; one end of the bimetallic strip is arranged at the support groove, and the bimetallic strip is clamped with the support column through the support groove; and one end of the static contact head is arranged on the bimetallic strip, the other end of the static contact head is connected with the movable contact head, and the static contact head is electrically connected with the second wiring terminal.

Optionally, the reset portion includes: the rotating head is rotatably arranged on one side of the working cavity, a reset end is arranged on the rotating head, and the reset end penetrates through the working cavity and extends to the outside of the shell; the second contact end is arranged on one side of the rotating head and is positioned above the insulating plate; prevent mistake and touch the portion, prevent that mistake touches the portion setting and be in the work intracavity, prevent mistake and touch the portion with the rotating head links to each other.

Optionally, the false touch prevention part includes: the first contact end is arranged on the rotating head and is positioned above the second contact end; the non-return end is arranged in the working cavity and is positioned on one side of the first contact end; one end of the first spring is connected with the non-return end, and the other end of the first spring is connected with the inner wall of the working cavity.

Optionally, a connecting sheet is arranged on the second contact end, and the other end of the connecting sheet is connected with the insulating plate.

The utility model has the advantages that:

the reset part, the movable contact part and the static contact part are arranged in the shell, so that the connectivity between the movable contact part and the static contact part is controlled, and the circuit communication between the first wiring terminal and the second wiring terminal is ensured; the reset part can adjust the connection relation between the movable contact part and the static contact part, and on one hand, the reset part can manually disconnect a circuit between the first terminal and the second terminal; on the other hand, the tripped circuit can be manually adjusted. Meanwhile, the structure is simple, and batch processing and production are convenient.

Drawings

Fig. 1 is a schematic diagram of an overall structure of an automatic protection switch for a low-voltage apparatus according to the present invention;

fig. 2 is a schematic diagram of an internal structure of a housing of an automatic protection switch of a low-voltage apparatus according to the present invention.

The symbols in the figures are as follows:

1. a housing;

11. a working chamber;

2. a shell cover;

3. a first terminal;

4. a switch assembly;

41. a non-return end; 411. a first spring;

42. rotating the head; 421. a first contact end; 422. a reset terminal; 423. a second contact end;

43. a second spring; 431. an insulating plate; 432. connecting sheets; 433. a movable contact head; 434. a connecting plate;

44. a stationary contact; 441. a second terminal; 442. a bimetal;

45. a support pillar; 451. a support groove;

46. the connecting end is fixed.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1-2, an automatic protection switch for low voltage electric appliances, which can be used for protecting household electric appliance connection switches and other electric appliances in practical use. The automatic protection switch comprises a shell 1, a switch assembly 4 and a shell cover 2. The inside of casing 1 is provided with working chamber 11, working chamber 11 is used for the switch work of load-bearing circuit. The switch assembly 4 is disposed inside the working chamber 11. The first terminal 3 and the second terminal 441 are arranged on the shell 1, the first terminal 3 and the second terminal 441 both extend to the inside of the working cavity 11, the first terminal 3 and the second terminal 441 are respectively arranged oppositely, so that circuit circulation is facilitated, and meanwhile, the structure is compact, the first terminal 3 and the second terminal 441 are connected through the switch assembly 4, and the switch assembly 4 can control the circuit communication of the first terminal 3 and the second terminal 441. In this embodiment, the first terminal 3 and the second terminal 441 are oppositely disposed on the upper and lower surfaces of the housing 1, and the switch assembly 4 is located between the first terminal 3 and the second terminal 441. The shell cover 2 is arranged on one side of the shell body 1 and used for covering the working cavity 11 and protecting the switch component 4 in the working cavity 11, and on the other hand, the circuit is also protected.

The switch assembly 4 includes a reset portion, a movable contact portion, and a stationary contact portion. The portion that resets sets up one side of working chamber 11, just the one end of the portion that resets extends to the outside of casing 1 makes things convenient for operating personnel to reset the operation. Move the contact site setting and be in the one end of first wiring end 3, move the contact site with 3 electric connection of first wiring end, move the contact site with the one end of portion that resets contacts, the portion that resets is used for driving and moves the contact site and resets, guarantees the circuit intercommunication. The static contact part is arranged in the working cavity 11, one end of the static contact part is electrically connected with one end of the second terminal 441, the static contact part is arranged at the movable contact part, and the static contact part and the movable contact part are electrically connected. When the current is overlarge, the sensing assembly on the static contact part deforms, the static contact part and the movable contact part are separated, and at the moment, the circuits between the static contact part and the movable contact part are disconnected, so that the open circuit protection of the electrical assembly is completed.

The movable contact portion includes an insulating plate 431, a connecting plate 434, a second spring 43, and a movable contact 433. The connecting plate 434 is disposed on one side of the inner wall of the working chamber 11, and the connecting plate 434 is close to the reset portion. The insulating plate 431 is slidably coupled to the coupling plate 434. One end of the insulating plate 431 is connected with the second spring 43, the other end of the insulating plate 431 is connected with the movable contact 433, the insulating plate 431 is connected with the inner wall of the working chamber 11 through the second spring 43, and one end of the movable contact 433 is electrically connected with the first terminal 3. When the current is too large, the sensing assembly on the static contact part deforms, the static contact part does not limit the movable contact 433, at the moment, the second spring 43 elastically resets to drive the insulating plate 431 to slide on the connecting plate 434 towards the other side of the working cavity 11, at the moment, the second spring 43 is in a relaxation state, the movable contact 433 is separated from the static contact part, namely, a circuit between the first terminal 3 and the second terminal 441 is disconnected, the electric equipment is subjected to open circuit protection, and a maintenance time is provided for an operator.

In an embodiment, move the contact site and still include fixed switch-on end 46, fixed switch-on end 46 sets up move contact 433 with between the first wiring end 3, first wiring end 3 with move between the contact 433 through fixed switch-on end 46 electric connection can guarantee to move contact 433 when moving, can not drive first wiring end 3 and remove, has guaranteed the stability of first wiring end 3. In this embodiment, the fixed connection end 46 is fixedly disposed in the working chamber 11, the fixed connection end 46 is located between the first terminal 3 and the movable contact terminal 433, the fixed terminal and the first terminal 3 are connected through a conducting wire, one end of the movable contact terminal 433 is connected with the fixed contact end, and it is ensured that the first terminal 3 and one end of the movable contact portion are always in a connected state.

The stationary contact portion includes a stationary contact head 44, a bimetal 442 and a support pillar 45. The supporting column 45 is arranged in the working cavity 11, the supporting column 45 is close to the second terminal 441, and a supporting groove 451 is arranged on one side of the supporting column 45 close to the second terminal 441. The bimetal strip 442 is disposed at one side of the working chamber 11, the bimetal strip 442 is located inside the supporting groove 451, the bimetal strip 442 passes through the supporting groove 451 and the supporting column 45, and the bimetal strip 442 is electrically connected to the second terminal 441 through a conducting wire. The one end setting of static contact 44 is in on bimetallic strip 442, the other end of static contact 44 is located move the below of contact 433, just static contact 44 with move the joint between the contact 433. When the current is too large, the bimetal strip 442 is heated and deformed, and because one end of the bimetal strip 442 is fixed with the supporting column 45, when the bimetal strip 442 is deformed, the bimetal strip 442 drives the static contact 44 to bend downwards, and at this time, the static contact 44 is separated from the movable contact 433, that is, the circuit between the first terminal 3 and the second terminal 441 is disconnected, so that open-circuit protection is formed.

The reset part includes a rotating head 42, a connecting piece 432, a second contact end 423, and a mis-touch prevention part. The rotating head 42 is rotatably connected to one side of the working chamber 11, a reset end 422 is arranged on one side of the rotating head 42, the reset end 422 penetrates through the shell 1 and extends to the outside of the shell 1, and the reset end 422 is used for an operator to rotate the rotating head 42. The second contact end 423 is disposed on the rotating head 42, the second contact end 423 is disposed in the working chamber 11, the second contact end 423 is located above the insulating plate 431, and the second contact end 423 is used for driving the insulating plate 431 to reset. The connecting sheet 432 is arranged between the second contact end 423 and the insulating sheet 431, and the second contact end 423 is connected with the insulating sheet 431 through the connecting sheet 432, so that the connectivity between the second contact end 423 and the insulating sheet 431 is enhanced, and the second contact end 423 can be used for fully driving the insulating sheet 431 to reset. Prevent mistake and touch the portion setting on rotary head 42, just prevent that mistake touches the position and is located the top of second contact tip 423, prevent that mistake touches the portion and is used for preventing that external factors from touching the portion that resets by mistake, avoid appearing artificial improper operation and open circuit first wiring end 3 and second wiring end 441. Of course, when the first terminal 3 and the second terminal 441 need to be disconnected, the operator may control the reset terminal 422 to disconnect the first terminal 3 and the second terminal 441. In this embodiment, when the static contact head 44 and the movable contact head 433 are separated by the overvoltage protection, the movable contact head 433 is located on one side of the static contact head 44 and located below the second contact end 423 at the same time, after the operator checks and maintains the circuit, the operator drives the rotating head 42 to rotate through the reset end 422, the second contact end 423 turns over downward at the time, the insulating plate 431 is driven to move toward one side, the state of the second spring 43 is changed from relaxation to compression at the time, and the movable contact head 433 is located on the other side of the static contact head 44 at the same time. The bimetal 442 is deformed and reset, and drives the stationary contact 44 to clamp the movable contact 433, that is, the first terminal 3 and the second terminal 441 are communicated.

The mis-touch prevention part includes a first contact end 421, a non-return end 41, and a first spring 411. The first contact end 421 is disposed on the rotating head 42, and the first contact end 421 is located above the second contact end 423. The non-return end 41 is arranged on the working cavity 11, the non-return end 41 is located on one side of the first contact end 421, and the non-return end 41 is used for clamping and limiting the first contact end 421. First spring 411 sets up in the working chamber 11, first spring 411's one end with the inner wall top of working chamber 11 links to each other, first spring 411's the other end with non return end 41 links to each other, promptly non return end 41 passes through first spring 411 with the inner wall of working chamber 11 links to each other for prevent that operating personnel from carrying out the mistake and touching. The working principle of the false touch prevention part is as follows: the reset end 422 drives the rotating head 42 to rotate, at this time, the first contact end 421 on the rotating head 42 is clamped with the non-return end 41, at this time, an operator needs to forcibly rotate the rotating head 42, so that the first contact end 421 compresses the first spring 411 on the non-return end 41, and at this time, the first contact end 421 is slowly located on the other side of the non-return end 41, so that the operator can be effectively prevented from mistakenly touching; when the first contact end 421 is located at the other side of the non-return end 41, the second contact end 423 continues to move towards one side of the second spring 43 through the insulating plate 431, and the second spring 43 continues to compress while the static contact end and the movable contact end are separated, that is, the first terminal 3 and the second terminal 441 are disconnected manually. Since the first contact end 421 is located at the other side of the non-return end 41, the elastic force of the second spring 43 can clamp the first contact end 421 at one side of the non-return end 41 through the insulating plate 431 and the second contact end 423, which means that after the first terminal 3 and the second terminal 441 are manually disconnected, an operator needs to manually operate the first terminal 3 and the second terminal 441 for a long time, and the first terminal 3 and the second terminal 441 are connected, which means that the stability and the safety of the circuit disconnection are ensured.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (7)

1. An automatic protection switch for low-voltage electrical appliances, characterized in that it comprises:

a casing, a working chamber, a first terminal and a second terminal arranged in the casing

The first terminal and the second terminal are used for the circuit of the automatic protection switch to be connected with an electric appliance for circulation;

the switch assembly comprises a reset part, a movable contact part and a static contact part; the reset part, the movable contact part and the static contact part are all arranged in the working cavity, the movable contact part is in electric wire connection with the first wiring terminal, the static contact part is electrically connected with the second wiring terminal, the reset part is positioned on one side above the movable contact part, and the reset part is used for controlling the on-off of a circuit between the static contact part and the movable contact part;

and the shell cover is arranged on one side of the shell and is used for covering the working cavity.

2. The automatic protection switch for low-voltage electrical apparatus according to claim 1, wherein said movable contact portion comprises:

the connecting plate is arranged on one side of the inner wall of the working cavity and is close to the resetting part;

the insulating plate is arranged on the connecting plate, and one end of the insulating plate is connected with the reset part;

the second spring is arranged on the connecting plate, one end of the second spring is connected with the connecting plate, and the other end of the second spring is connected with the inner wall of the working cavity;

and the movable contact head is arranged on the insulating plate and is positioned at one end far away from the second spring, and the movable contact head is electrically connected with the first wiring end.

3. The automatic protection switch of claim 2, wherein the movable contact portion further comprises a fixed connection end, the fixed connection end is disposed between the movable contact and the first terminal, and the first terminal is electrically connected to the movable contact through the fixed connection end.

4. The automatic protection switch for low-voltage electrical apparatus according to claim 2, wherein said stationary contact comprises:

the supporting column is arranged in the working cavity and provided with a supporting groove;

one end of the bimetallic strip is arranged at the support groove, and the bimetallic strip is clamped with the support column through the support groove;

and one end of the static contact head is arranged on the bimetallic strip, the other end of the static contact head is connected with the movable contact head, and the static contact head is electrically connected with the second wiring terminal.

5. The automatic protection switch of a low-voltage apparatus according to claim 2, wherein said reset portion comprises:

the rotating head is rotatably arranged on one side of the working cavity, a reset end is arranged on the rotating head, and the reset end penetrates through the working cavity and extends to the outside of the shell;

the second contact end is arranged on one side of the rotating head and is positioned above the insulating plate;

prevent mistake and touch the portion, prevent that mistake touches the portion setting and be in the work intracavity, prevent mistake and touch the portion with the rotating head links to each other.

6. The automatic protection switch of a low-voltage apparatus according to claim 5, wherein the false touch prevention part comprises:

the first contact end is arranged on the rotating head and is positioned above the second contact end;

the non-return end is arranged in the working cavity and is positioned on one side of the first contact end;

one end of the first spring is connected with the non-return end, and the other end of the first spring is connected with the inner wall of the working cavity.

7. The automatic protection switch of a low-voltage apparatus according to any one of claims 5 to 6, wherein the second contact end is provided with a connecting piece, and the other end of the connecting piece is connected with the insulating plate.

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