CN215680592U

CN215680592U - Over-voltage and under-voltage protection device of small circuit breaker

Info

Publication number: CN215680592U
Application number: CN202122118757.9U
Authority: CN
Inventors: 黄冬华
Original assignee: ANHUI HUIKAI ELECTRIC CO LTD
Current assignee: ANHUI HUIKAI ELECTRIC CO LTD
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2022-01-28
Anticipated expiration: 2031-09-03

Abstract

The utility model provides an overvoltage and undervoltage protection device of a miniature circuit breaker, which comprises a shell, a circuit contact, an on-off contact and a contact tripping mechanism, wherein the shell is provided with a shell body; the contact trip mechanism comprises a contact clamping plate mechanism, a stepping motor, a motor mounting frame plate, a screw, a spring and a movable plate; contact plate splint mechanism is used for centre gripping break-make contact, and step motor sets up in motor installation deckle board, and the bottom of screw rod penetrates in the motor installation deckle board and links to each other with step motor's pivot, and contact plate splint mechanism slides and sets up in the screw rod middle part, and the spring sets up in the screw rod lower part, and the top of spring links to each other with contact clamping mechanism, the bottom links to each other with motor installation deckle board, and movable plate slides and sets up in the screw rod top and with screw rod threaded connection. The device controls the on-off of the circuit by arranging the stepping motor, when the circuit is disconnected, the stepping motor does not need to continuously supply power, the circuit can be continuously disconnected, the safety performance of the circuit can be improved, and the power consumption cost is reduced.

Description

Over-voltage and under-voltage protection device of small circuit breaker

Technical Field

The utility model belongs to the technical field of circuit breakers, and particularly relates to an overvoltage and undervoltage protection device of a miniature circuit breaker.

Background

When the line is in an overvoltage state, because the voltage exceeds a specified value of a power grid or an electric appliance bearing value, electric appliance components can be damaged, and an electric fire can be caused seriously. When two circuits are in undervoltage, internal elements of an electric appliance can be damaged due to insufficient voltage, fire can be caused, especially when the motor is in undervoltage, the rotating speed of the motor can be reduced, and equipment damage and major potential safety hazards can be caused directly due to uncoordinated rotating speed of the motor in the automation industry.

In order to avoid the damage of electric appliance components and parts caused by overvoltage or undervoltage abnormality of a circuit line, a circuit breaker with an undervoltage protection function is usually installed on the circuit line, the existing circuit breaker usually adopts an electromagnet principle to control the tripping mechanism inside the circuit breaker to break off so as to realize the rapid breaking of the circuit, but the overvoltage and undervoltage protection structure needs to ensure that the electromagnet is always electrified when the circuit is kept open, more electric energy is consumed, and meanwhile, when the circuit is not powered, the tripping mechanism cannot be kept broken, so that the circuit has safety risk.

SUMMERY OF THE UTILITY MODEL

The utility model provides an overvoltage and undervoltage protection device of a miniature circuit breaker, which aims to solve the technical problems and provides an overvoltage and undervoltage protection device of a miniature circuit breaker, wherein a stepping motor is arranged to control a screw rod to rotate, the screw rod drives a movable plate to move, the movable plate can push an on-off contact piece to be separated from circuit contact pieces on two sides, so that a circuit is broken, after the movable plate is separated from the on-off contact piece, a spring can push the on-off contact piece to be contacted with the circuit contact pieces on two sides under the action of the spring, the circuit is communicated, when the circuit is broken, the stepping motor does not need to continuously supply power, the circuit can be continuously broken, the safety performance of the circuit is improved, and the power consumption cost is reduced.

The utility model is realized by the following technical scheme:

an overvoltage and undervoltage protection device of a miniature circuit breaker comprises a shell, a circuit contact, an on-off contact and a contact tripping mechanism; the two circuit contact pieces are respectively and fixedly arranged in the shell, and the contact piece tripping mechanism is used for controlling the contact or the separation of the two ends of the on-off contact piece and the two circuit contact pieces so as to realize the on-off of the circuit; the contact trip mechanism comprises a contact clamping plate mechanism, a stepping motor, a motor mounting frame plate, a screw, a spring and a movable plate; the contact plate clamping mechanism is used for clamping on-off contact plates, the stepping motor is arranged in the motor installation frame plate, the bottom end of the screw penetrates into the motor installation frame plate and is connected with a rotating shaft of the stepping motor, the stepping motor is used for driving the screw to rotate, the contact plate clamping mechanism is arranged in the middle of the screw in a sliding mode, the spring is arranged on the lower portion of the screw, the top end of the spring is connected with the contact plate clamping mechanism, the bottom end of the spring is connected with the motor installation frame plate, and the movable plate is arranged on the top of the screw in a sliding mode and is in threaded connection with the screw.

Further inject, the device still includes the relay, the relay is installed in the casing, and the relay is used for controlling step motor to open and stop, specifically, the relay is connected in the circuit, and the relay controls step motor to open and stop according to circuit excessive pressure or the undervoltage condition.

Further limiting, the contact plate clamping plate mechanism comprises a contact plate supporting plate, a contact plate cover plate, a T-shaped threaded cylinder and a threaded plate; the middle part of the contact piece supporting plate is provided with a sleeve, the top end of the T-shaped threaded cylinder penetrates through the sleeve, the middle part of the contact piece cover plate is sleeved on the T-shaped threaded cylinder, the threaded piece is installed at the top end of the T-shaped threaded cylinder, the on-off contact piece is clamped between the contact piece supporting plate and the contact piece cover plate, and the contact piece supporting plate and the contact piece cover plate are clamped between the T-shaped threaded cylinder and the threaded piece; a through hole which is convenient for the screw to pass through is arranged in the T-shaped thread cylinder; specifically, sleeve and contact layer board integrated into one piece, the middle part of break-make contact is equipped with the through-hole that the sleeve of being convenient for passed, and a T type screw thread section of thick bamboo is equipped with the external screw thread, and the flight is equipped with the internal thread hole, and during the installation, the top of spring meets with the bottom of a T type screw thread section of thick bamboo.

Further, the contact supporting plate, the contact cover plate and the sleeve are made of insulating plastic materials, so that electric leakage is avoided.

Further limiting, first sliding rail mechanisms are symmetrically arranged on the left side and the right side of the contact piece supporting plate, first sliding blocks are arranged at the left end and the right end of the contact piece supporting plate, and the first sliding blocks are connected with the first sliding rail mechanisms in a sliding mode; specifically, be equipped with the arc spout on the first slider, first slide rail mechanism includes mounting panel and guide rail post, and the mounting panel is installed on the casing, and the guide rail post is installed on the mounting panel, arc spout and guide rail post cooperation.

Further limiting, the left side and the right side of the top of the screw rod are symmetrically provided with a second slide rail mechanism, the left side and the right side of the movable plate are both provided with a second slide block, and the second slide blocks are connected with the second slide rail mechanisms in a sliding manner; specifically, be equipped with the arc spout on the second slider, second slide rail mechanism includes mounting panel and guide rail post, and the mounting panel is installed on the casing, and the guide rail post is installed on the mounting panel, arc spout and guide rail post cooperation.

According to the technical scheme, the overvoltage and undervoltage protection device of the miniature circuit breaker has the advantages that: when the device is operated and a circuit is connected, the tops of the left and right ends of the on-off contact piece are respectively abutted against the bottom ends of the two circuit contact pieces, so that the two circuit contact pieces are communicated with each other; when the circuit needs to be disconnected due to undervoltage or overvoltage of the circuit, the stepping motor drives the screw rod to rotate, the movable plate moves downwards along the screw rod and pushes the contact trip mechanism to move downwards, and the contact trip mechanism drives the on-off contact to be separated from the two circuit contacts, so that the circuit is disconnected; the contact trip mechanism compresses the spring, and after the circuit end is opened and the stepping motor is powered off, the movable plate keeps in place, so that the circuit can be always ensured to be disconnected; when the circuit is under-voltage or over-voltage, the stepping motor drives the screw rod to rotate, the movable plate moves upwards along the screw rod, the spring pushes the contact trip mechanism to move upwards under the action of the restoring force of the spring until the tops of the left end and the right end of the on-off contact are respectively abutted against the bottom ends of the two circuit contacts, the on-off contact moves in place, and the on-off contact is not influenced even if the stepping motor drives the screw rod to continue to rotate. The device is through setting up step motor control screw rod and rotating, and the screw rod drives movable plate and removes, and movable plate can promote the break-make contact and break away from both sides circuit contact, makes the circuit disjunction, and after movable plate breaks away from the break-make contact, under the spring action, the spring can promote the break-make contact both sides circuit contact, realizes the circuit intercommunication, and when the circuit disjunction, step motor need not to last the power supply, also can continue to keep the circuit disjunction, improves circuit security performance, reduces power consumption cost.

Drawings

In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of the present invention in a circuit connection state.

FIG. 2 is a schematic diagram of the structure of the present invention in the open state

Fig. 3 is a schematic view of a portion of the structure of fig. 1.

Fig. 4 is a schematic view of a portion of the structure of fig. 2.

In the drawings: 1-shell, 2-circuit contact, 3-on-off contact, 4-contact trip mechanism, 41-contact splint mechanism, 411-contact support plate, 412-contact cover plate, 413-T-shaped threaded barrel, 414-threaded piece, 42-stepping motor, 43-motor mounting frame plate, 44-screw, 45-spring, 46-movable plate, 5-relay, 6-first slide rail mechanism, 7-first slide block, 8-second slide rail mechanism and 9-second slide block.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 4, an overvoltage and undervoltage protection device of a small circuit breaker comprises a shell 1, a circuit contact 2, an on-off contact 3, a contact trip mechanism 4 and a relay 5;

the two circuit contact pieces 2 are respectively and fixedly arranged in the shell 1, and the contact piece tripping mechanism 4 is used for controlling the two ends of the on-off contact piece 3 to be in contact with or separated from the two circuit contact pieces 2 so as to realize the on-off of the circuit;

the contact trip mechanism 4 comprises a contact clamping plate mechanism 41, a stepping motor 42, a motor mounting frame plate 43, a screw 44, a spring 45 and a movable plate 46; the contact plate clamping mechanism 41 is used for clamping an on-off contact plate 3, the stepping motor 42 is arranged in the motor mounting frame plate 43, the bottom end of the screw rod 44 penetrates into the motor mounting frame plate 43 and is connected with a rotating shaft of the stepping motor 42, the stepping motor 42 is used for driving the screw rod 44 to rotate, the contact plate clamping mechanism 41 is arranged in the middle of the screw rod 44 in a sliding mode, the spring 45 is arranged on the lower portion of the screw rod 44, the top end of the spring 45 is connected with the contact plate clamping mechanism, the bottom end of the spring 45 is connected with the motor mounting frame plate 43, and the movable plate 46 is arranged on the top of the screw rod 44 in a sliding mode and is in threaded connection with the screw rod 44;

contact plate mechanism 41 comprises contact plate bracket 411, contact cover plate 412, T-shaped threaded barrel 413 and threaded piece 414; the middle part of the contact piece supporting plate 411 is provided with a sleeve, the top end of a T-shaped threaded cylinder 413 penetrates through the sleeve, the middle part of a contact piece cover plate 412 is sleeved on the T-shaped threaded cylinder 413, a threaded piece 414 is arranged at the top end of the T-shaped threaded cylinder 413, an on-off contact piece 3 is clamped between the contact piece supporting plate 411 and the contact piece cover plate 412, the contact piece supporting plate 411 and the contact piece cover plate 412 are clamped between the T-shaped threaded cylinder 413 and the threaded piece 414, and the on-off contact piece 3 can be detachably arranged and the on-off contact piece 3 can be clamped; a through hole for the screw rod 44 to pass through is arranged in the T-shaped threaded barrel 413; specifically, the sleeve and the contact supporting plate 411 are integrally formed, a through hole through which the sleeve can conveniently pass is formed in the middle of the on-off contact 3, an external thread is formed on the T-shaped thread cylinder 413, an internal thread hole is formed in the thread piece 414, and when the T-shaped thread cylinder is installed, the top end of the spring 45 is connected with the bottom end of the T-shaped thread cylinder 413;

relay 5 installs in casing 1, and relay 5 is used for controlling step motor 42 to open and stop, specifically, relay 5 connects in the circuit, and relay 5 controls step motor 42 to open and stop according to circuit excessive pressure or under-voltage condition.

In this embodiment, the contact supporting plate 411, the contact cover plate 412 and the sleeve are all made of insulating plastic materials, so as to avoid electric leakage.

In this embodiment, the left side and the right side of the contact supporting plate 411 are symmetrically provided with first sliding rail mechanisms 6, the left end and the right end of the contact supporting plate 411 are both provided with first sliding blocks 7, and the first sliding blocks 7 are slidably connected with the first sliding rail mechanisms 6; specifically, be equipped with the arc spout on the first slider 7, first slide rail mechanism 6 includes mounting panel and guide rail post, and the mounting panel is installed on casing 1, and the guide rail post is installed on the mounting panel, arc spout and guide rail post cooperation.

In this embodiment, the second slide rail mechanisms 8 are symmetrically arranged on the left and right sides of the top of the screw 44, the second slide blocks 9 are arranged on the left and right sides of the movable plate 46, and the second slide blocks 9 are slidably connected with the second slide rail mechanisms 8; specifically, an arc-shaped sliding groove is formed in the second sliding block 9, the second sliding rail mechanism 8 comprises an installation plate and a guide rail column, the installation plate is installed on the shell 1, the guide rail column is installed on the installation plate, and the arc-shaped sliding groove is matched with the guide rail column.

The working principle of the embodiment is as follows: when the device is operated and a circuit is connected, the tops of the left and right ends of the on-off contact piece 3 are respectively abutted against the bottom ends of the two circuit contact pieces 2, so that the two circuit contact pieces 2 are communicated with each other; when the circuit needs to be disconnected due to undervoltage or overvoltage of the circuit, the relay 5 controls the stepping motor 42 to start according to the overvoltage or undervoltage condition of the circuit, the stepping motor 42 drives the screw 44 to rotate, the movable plate 46 moves downwards along the screw 44 and pushes the contact trip mechanism 4 to move downwards, and the contact trip mechanism 4 drives the on-off contact 3 to be separated from the two circuit contacts 2, so that the circuit is disconnected; the contact trip mechanism 4 compresses the spring 45, and after the circuit end is opened and the stepping motor 42 is powered off, the movable plate 46 keeps the original position, so that the circuit can be always ensured to be disconnected; when the circuit is under-voltage or under-voltage, the relay 5 controls the stepping motor 42 to start according to the circuit over-voltage or under-voltage, the stepping motor 42 drives the screw rod 44 to rotate, the movable plate 46 moves upwards along the screw rod 44, the spring 45 pushes the contact trip mechanism 4 to move upwards under the action of the restoring force of the spring 45 until the tops of the left end and the right end of the on-off contact piece 3 are respectively abutted to the bottom ends of the two circuit contact pieces 2, the on-off contact piece 3 moves in place, the movable plate 46 is separated from the contact trip mechanism 4, and even if the stepping motor 42 drives the screw rod 44 to continue to rotate, the on-off contact piece 3 is not influenced. The device controls the screw rod 44 to rotate by arranging the stepping motor 42, the screw rod 44 drives the movable plate 46 to move, the movable plate 46 can push the on-off contact piece 3 to be separated from the circuit contact pieces 2 on two sides, so that a circuit is disconnected, after the movable plate 46 is separated from the on-off contact piece 3, the spring 45 can push the on-off contact piece 3 to be contacted with the circuit contact pieces 2 on two sides under the action of the spring 45, so that the circuit is communicated, when the circuit is disconnected, the stepping motor 42 does not need to continuously supply power, the circuit can be continuously disconnected, the safety performance of the circuit is improved, and the power consumption cost is reduced.

Claims

1. An overvoltage and undervoltage protection device of a miniature circuit breaker comprises a shell, a circuit contact, an on-off contact and a contact tripping mechanism; the two circuit contact pieces are respectively and fixedly arranged in the shell, and the contact piece tripping mechanism is used for controlling the contact or the disconnection of the two ends of the on-off contact piece and the two circuit contact pieces; the method is characterized in that: the contact trip mechanism comprises a contact clamping plate mechanism, a stepping motor, a motor mounting frame plate, a screw, a spring and a movable plate; the contact plate clamping mechanism is used for clamping on-off contact plates, the stepping motor is arranged in the motor installation frame plate, the bottom end of the screw penetrates into the motor installation frame plate and is connected with a rotating shaft of the stepping motor, the stepping motor is used for driving the screw to rotate, the contact plate clamping mechanism is arranged in the middle of the screw in a sliding mode, the spring is arranged on the lower portion of the screw, the top end of the spring is connected with the contact plate clamping mechanism, the bottom end of the spring is connected with the motor installation frame plate, and the movable plate is arranged on the top of the screw in a sliding mode and is in threaded connection with the screw.

2. The overvoltage and undervoltage protection device of a small circuit breaker according to claim 1, wherein: the device still includes the relay, the relay is installed in the casing, and the relay is used for controlling step motor to open and stop.

3. The overvoltage and undervoltage protection device of a small-sized circuit breaker according to claim 1 or 2, wherein: the contact plate clamping plate mechanism comprises a contact plate supporting plate, a contact plate cover plate, a T-shaped threaded cylinder and a threaded plate; the middle part of the contact piece supporting plate is provided with a sleeve, the top end of the T-shaped threaded cylinder penetrates through the sleeve, the middle part of the contact piece cover plate is sleeved on the T-shaped threaded cylinder, the threaded piece is arranged at the top end of the T-shaped threaded cylinder, the on-off contact piece is clamped between the contact piece supporting plate and the contact piece cover plate, and the contact piece supporting plate and the contact piece cover plate are clamped between the T-shaped threaded cylinder and the threaded piece; and a through hole which is convenient for the screw rod to pass through is arranged in the T-shaped thread cylinder.

4. The overvoltage and undervoltage protection device of a small circuit breaker according to claim 3, wherein: the contact supporting plate, the contact cover plate and the sleeve are all made of insulating plastic materials.

5. The overvoltage and undervoltage protection device of a small circuit breaker according to claim 3, wherein: the left side and the right side of the contact supporting plate are symmetrically provided with first sliding rail mechanisms, the left end and the right end of the contact supporting plate are provided with first sliding blocks, and the first sliding blocks are connected with the first sliding rail mechanisms in a sliding mode.

6. The overvoltage and undervoltage protection device of a small circuit breaker according to claim 5, wherein: the left side and the right side of the top of the screw rod are symmetrically provided with second sliding rail mechanisms, the left side and the right side of the movable plate are both provided with second sliding blocks, and the second sliding blocks are connected with the second sliding rail mechanisms in a sliding mode.