CN215268102U

CN215268102U - Safety starter

Info

Publication number: CN215268102U
Application number: CN202121772751.7U
Authority: CN
Inventors: 王燕霞; 赵新华; 石晓波; 戴照强
Original assignee: Qingdao Wanbao Compressor Co ltd
Current assignee: Qingdao Wanbao Compressor Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-12-21
Anticipated expiration: 2031-07-30

Abstract

The utility model belongs to the technical field of starters, and discloses a safety starter, which comprises a starter body and an overcurrent protection device, wherein a clamping groove is arranged in the starter body, the overcurrent protection device is arranged in the clamping groove, and the output end of the overcurrent protection device is connected with the input end of a starter body circuit in series; the utility model discloses increased overcurrent protection device on the starter, played duplicate protection's effect to whole power supply circuit, when the protector became invalid, can exert the guard action, effectual disconnection power supply circuit avoids the potential safety hazard that heavy current frequently strikeed and brings.

Description

Safety starter

Technical Field

The utility model belongs to the technical field of the starter, concretely relates to safe type starter.

Background

The single-phase asynchronous motor applied to the compressor needs to be provided with a PTC starter to control the on and off of a starting winding so as to realize the transition of the motor from a starting state to an operating state. When the compressor fails to start, the motor tries to start continuously, the temperature of a starting winding is accumulated continuously, the winding of the motor is blown off, the motor is broken, and the compressor cannot work; the insulating layer of the motor winding is damaged, a plurality of local short circuits occur, so that larger current is generated, the sealing structure of the sealing binding post of the compressor is punctured, the refrigerant is leaked, the compressor is on fire, and personal safety and property loss are brought to users. In addition, according to the requirement, the power live wire should be connected to the protector terminal in front of the compressor common end, the protector can protect the common loop, if the live wire is reversely connected with the zero line, the live wire is connected to the main phase, the main phase has no protector, once abnormal conditions such as press grounding and the like occur, the main phase is relatively short-circuited, so that instantaneous large current is formed, and serious conditions such as machine burning and even fire are caused.

At present, the compressor generally adopts the mode of protection mode to increase external hot protector for the common port and the mode of built-in hot protector, two kinds of modes are all through the matching test, the compressor of giving every model is equipped with dedicated protector model, the disconnection of hot protector is influenced by the temperature of compressor shell and the electric current that lets in jointly, when the compressor is stifled changes or transships the operation, hot protector can move, break off motor circuit, thereby guarantee that motor winding's temperature is in can bearing the within range, this kind of mode only can protect mode single, and can not directly experience motor winding temperature, when hot protector became invalid, the motor faces the risk of burning out once more.

In addition, if the live wire and the zero line are reversely connected, the live wire is connected to the main phase, once abnormal conditions such as press grounding and the like occur, the main phase is relatively short-circuited, instantaneous large current is formed, severe conditions such as machine burning and even fire catching are caused, and the protector cannot effectively protect the conditions.

SUMMERY OF THE UTILITY MODEL

Frequent start attempt after the compressor start failure and live wire and zero line connect anti-excessively big electric current in leading to the circuit, and current protector can't realize effective protection, in order to solve above-mentioned technical problem, the utility model provides a safe type starter to solve through following technical scheme:

the utility model discloses a safe type starter, including starter body and overcurrent protection device, this internal draw-in groove that is equipped with of starter, overcurrent protection device sets up in the draw-in groove, overcurrent protection device's output with the input of starter body circuit is established ties together.

Further, two metal terminals are arranged in the clamping groove, and the overcurrent protection device is fixed between the two metal terminals.

Further, the overcurrent protection device is a fuse.

Further, the overcurrent protection device is an overcurrent protector comprising an overcurrent protection circuit.

Furthermore, a wiring end is arranged on the metal terminal.

Further, the material of the metal terminal is copper.

Further, the starter body and the overcurrent protection device are externally coated with an electric insulation shell.

Furthermore, a partition board is arranged in the starter body and forms the clamping groove with the electric insulation shell.

Further, the separator is an electrically insulating material.

Further, the electric insulating material is PBT plastic.

Above-mentioned the utility model has the advantages as follows:

(1) the utility model adds the over-current protection device on the starter, plays the role of double protection to the whole power circuit, can play the role of protection when the protector fails, effectively breaks the power circuit, and avoids the potential safety hazard caused by frequent impact of heavy current;

(2) the starter and the overcurrent protection device are integrated, the size is small, a large amount of space is not occupied, the realization is easy, and the batch switching of the original starter is not influenced;

(3) according to the requirement, the power live wire is connected to the protector terminal in front of the common end of the compressor, the protector can protect the common loop, if the live wire is reversely connected with the zero line, the live wire is connected to the main phase, the main phase has no protector, once abnormal conditions such as press grounding and the like occur, the main phase is relatively short-circuited, instantaneous large current is formed, serious conditions such as machine burning and even fire starting are caused, therefore, an overcurrent protection device is added on the starter and is connected in series at the front end of the main phase, when the power circuit is in short circuit abnormality, the power loop can be cut off rapidly, and serious accidents are avoided.

(4) The safety protection device mainly takes overcurrent protection as a main part, the safety protection device can be a fuse wire or an electronic circuit of other overcurrent protection types, the current specification of the fuse wire or the electronic circuit is obtained by matching the model of a specific compressor, and when the current in the power circuit exceeds the current specified value of the safety protection device, the safety protection device acts to disconnect the power circuit.

Drawings

The accompanying drawings, which form a part of the specification, are provided to provide a further understanding of the invention, and are included to explain the illustrative embodiments and the description of the invention, and not to constitute a limitation of the invention.

Fig. 1 is a schematic view of the overall structure of the middle starter of the present invention;

fig. 2 is a schematic structural diagram of the starter body of the present invention;

fig. 3 is a schematic view of the metal terminal structure of the present invention;

fig. 4 is a schematic structural view of the fuse of the present invention;

fig. 5 is a schematic diagram of the access circuit of the starter of the present invention.

In the figure, 1 a starter body, 2 a fuse wire, 3 a clamping groove, 4 metal terminals, 5 a clapboard, 6 a motor,

7 overload protector, 8 power supply and 9 electric insulation shell.

The spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1 and 2, the utility model provides a safe starter, including starter body 1 and overcurrent protection device, 1 is equipped with draw-in groove 3 in the starter body, and overcurrent protection device sets up 3 in the draw-in groove, and overcurrent protection device's output and the input of starter body 1 circuit are established ties together.

The utility model adds the over-current protection device on the starter, plays the role of double protection to the whole power circuit, can play the role of protection when the protector fails, effectively breaks the power circuit, and avoids the potential safety hazard caused by frequent impact of heavy current; an overcurrent protection device is added on the starter and is connected in series with the front end of the main phase, when a power circuit is in short circuit abnormity, a power circuit can be cut off rapidly, and serious accidents are avoided.

The starter and the overcurrent protection device are integrated, the size is small, a large amount of space is not occupied, the realization is easy, and the batch switching of the original starter is not influenced.

Example 1

In this embodiment, as shown in fig. 1 to 4, an electrical insulating casing 9 is coated outside the starter body 1 and the overcurrent protection device, and a partition plate 5 is provided in the starter body 1 to form a clamping groove 3 with the electrical insulating casing 9. The overcurrent protection device is mainly used for internally breaking when the current passing through the device is higher than a designed value, so that the whole power supply circuit connected into the fixed-frequency compressor is disconnected, and the frequent impact of large current is avoided.

Preferably, in this embodiment, the overcurrent protection device is a fuse 2, and when the current abnormally rises to a certain height and heat, the fuse 2 itself fuses to cut off the current, thereby playing a role in protecting the safe operation of the circuit, and having a small volume, good current limiting characteristics, and low price, but cannot be reused after fusing.

In other embodiments, the overcurrent protection device is an overcurrent protector having an overcurrent protection circuit, and when the current flowing through the protected element exceeds a predetermined value, the overcurrent protector is activated and used for ensuring the selectivity of action, tripping the circuit breaker or giving an alarm signal, and can be reused, but is not as good as the fuse 2 in terms of price or reliability.

The fuse 3 or the electronic circuit current specification is obtained by matching the specific compressor model, when the current in the power circuit exceeds the current specified value of the overcurrent protection device, the overcurrent protection device acts to disconnect the power circuit.

The partition board 5 is made of an electric insulating material which is PBT plastic, and the PBT plastic has high heat resistance, toughness, fatigue resistance and good electric insulating property, so that the overcurrent protection device is prevented from being in contact with the starter body 1 to cause short circuit.

Two metal terminals 4 are arranged in the card slot 3, and an overcurrent protection device is fixed between the two metal terminals 4. The structure of the metal terminal 4 is determined according to the type of the protection device, the conductive area can be increased, the electrical safety connection is guaranteed, and the material is mainly copper with higher conductivity and is mostly copper tin plating. In order to facilitate connection with other electrical components, the metal terminals are provided with wiring ends.

Example 2

The present embodiment provides a compressor starting circuit, as shown in fig. 5, which is composed of a power supply 8, a starter in embodiment 1, a motor 6 and an overload protector 7, and a shell is arranged outside the motor 6. The utility model discloses a starter is for being applied to the fixed frequency compressor, and the effect of metal terminal forms conductive loop, guarantee compressor normal operating for connecting safety device input and output on the power after.

When the protector fails, the overcurrent protection device on the starter can effectively disconnect a power supply loop, and frequent impact caused by large current is avoided. The problems that the temperature of a starting winding is continuously accumulated, an insulating layer of a motor winding is damaged, a plurality of local short circuits occur, and the sealing structure of a sealing binding post of the compressor is broken down, the refrigerant leaks and the compressor is on fire due to the large current are avoided.

For abnormal conditions such as reverse connection of a live wire and a zero line and grounding of a press, the overcurrent protection device on the starter can effectively cut off instantaneous large current formed after a main phase is relatively short-circuited due to the fact that the overcurrent protection device is connected in series at the front end of the main phase, and serious accidents are avoided.

Although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the above-mentioned method and technical contents to make possible changes and modifications to the technical solution of the present invention without departing from the spirit and scope of the present invention, and therefore, any simple modification, equivalent changes and modifications made to the above embodiments by the technical substance of the present invention all belong to the protection scope of the technical solution of the present invention.

Claims

1. The safe starter is characterized by comprising a starter body and an overcurrent protection device, wherein a clamping groove is formed in the starter body, the overcurrent protection device is arranged in the clamping groove, and the output end of the overcurrent protection device is connected with the input end of a starter body circuit in series.

2. A safety starter as claimed in claim 1 wherein two metal terminals are provided in the slot and the overcurrent protection means is secured between the two metal terminals.

3. A safety starter as claimed in claim 2 wherein the overcurrent protection means is a fuse.

4. A safety starter as claimed in claim 1 wherein the overcurrent protection means is an overcurrent protector including an overcurrent protection circuit.

5. A safety actuator according to claim 2 or claim 3, wherein the metal terminals are provided with terminals.

6. A safety actuator according to claim 2 or claim 3, wherein the metal terminal is copper.

7. A safety starter according to claim 1 or 4 wherein the starter body and the overcurrent protection means are surrounded by an electrically insulating housing.

8. A safety actuator according to claim 7, wherein a spacer is provided in the actuator body to form said catch with the electrically insulating housing.

9. A safety actuator according to claim 8, wherein the diaphragm is electrically insulating.

10. A safety starter as claimed in claim 9 wherein the electrically insulating material is PBT plastic.