CN220306132U - Static contact structure and frame-type circuit breaker - Google Patents

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a static contact structure and a frame-type circuit breaker, wherein the static contact structure comprises a base and a plurality of static contact assemblies arranged on the base, each static contact assembly comprises a static contact and an insulating part, one side, which is relatively far away from the static contact, of the insulating part is taken as the front, one side, which is relatively close to the static contact, of the insulating part is taken as the rear, an embedded part is convexly arranged on the surface of the insulating part, the embedded part is positioned on the peripheral side of the static contact, the embedded part is embedded into the base, and the embedded part is positioned between the adjacent static contacts, so that the inter-phase creepage distance is increased; the frame type circuit breaker comprises the fixed contact structure. According to the utility model, the embedded part embedded into the base is convexly arranged on the surface of the insulating piece, so that the inter-phase creepage path turns around the embedded part, and the inter-phase creepage distance between adjacent fixed contacts is increased.

Description

Static contact structure and frame-type circuit breaker

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a fixed contact structure and a frame-type circuit breaker.

Background

The frame type circuit breaker is generally applied to the field of medium and high voltage electricity, so that an arc is generated when a fixed contact and a moving contact are disconnected, and the arc is usually extinguished through an arc extinguishing chamber to obtain good insulating performance of the circuit breaker. In order to better eliminate the electric arc, the electric arc is guided to the arc extinguishing chamber as much as possible, and therefore, the gas generating device is arranged to increase the air pressure of the moving and static contacts during breaking so that the electric arc can better enter the arc extinguishing chamber to extinguish the arc, but the existing circuit breaker is poor in air tightness, the gas generated by the gas generating device is easy to diffuse to the outside, and the high air pressure required by arc striking is difficult to maintain, so that the arc striking effect is not ideal.

When the circuit breaker is used for alternating current, the interphase static contact also has enough creepage distance and electric clearance to prevent interphase short circuit, and along with the use environment of the circuit breaker being more and more complex, higher requirements are also put forward on the interphase creepage distance and the electric clearance, and Chinese document CN218677010U proposes a static contact structure and a direct current circuit breaker, which obtain larger breaking energy by connecting two static contacts in series, improve the breaking capacity of the static contact, overcome the defect of failure of the interphase short circuit and short circuit breaking test caused by insufficient creepage distance and electric clearance, but have no substantial increase on the creepage distance.

Referring to fig. 1, the conventional static contact structure includes a base 1 and a static contact assembly disposed on the base 1, where an insulating member 22 of the static contact assembly abuts against the static contact, and an outer side of the insulating member 22 abuts against the base, so that a creepage path between the static contacts reaches a surface of the base (an upper surface abutting against the insulating member 22 in the drawing) through the insulating member 22, and thus, it is seen that an inter-phase creepage distance of the conventional circuit breaker is smaller.

Disclosure of Invention

The utility model aims to provide a static contact structure and a frame-type circuit breaker so as to solve the problem that the interphase creepage distance of the existing circuit breaker is insufficient.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: a static contact structure comprises a base and a plurality of static contact components arranged on the base,

each static contact assembly comprises a static contact and an insulating piece, wherein one side of the insulating piece, which is relatively far away from the static contact, is used as a front part, one side of the insulating piece, which is relatively close to the static contact, is used as a rear part,

the surface of the insulating piece is convexly provided with an embedded part, the embedded part is positioned on the outer peripheral side of the static contact, the embedded part is embedded into the base, and the embedded part is positioned between adjacent static contacts, so that the inter-phase creepage distance is increased.

According to the utility model, the embedded part embedded into the base is convexly arranged on the surface of the insulating piece, so that the inter-phase creepage path turns around the embedded part, and the inter-phase creepage distance between adjacent fixed contacts is increased.

Further, the insert portion is inserted into the base in a rearward extending manner, so that the inter-phase arc extends in a direction of the insert portion toward the rear side of the base.

The embedding part makes interphase electric arcs diffuse towards the rear side face of the base, and sufficient creepage distance is formed between adjacent fixed contacts.

Further, the side, relatively far away from the fixed contact, of the embedded part is taken as the outer side, and the outer side surface of the embedded part is provided with a shoulder part which is abutted with the base.

Through the shoulder that sets up in the embedding portion outside, after the arc, alternate electric arc strides the embedding portion and reaches the shoulder, reaches the leading flank of base along the shoulder for the electric arc has sufficient creepage distance before reaching the base in order to avoid alternate short circuit.

Further, the shoulder portion is provided at the front end of the embedded portion.

Since the embedded portion is extended rearward, the stability of the insulating member can be increased by the shoulder portion provided at the front end of the embedded portion.

Further, the insulating piece is also provided with a body part, and the body part is abutted with the fixed contact; the static contacts are arranged at intervals along the left-right direction, the left side and/or the right side of the body part are/is provided with a spacing part extending to the outer periphery side of the static contacts, and the embedded part is convexly arranged on the rear side surface of the spacing part so that the embedded part is positioned between the adjacent static contacts.

The embedded part is positioned between the adjacent fixed contacts through the spacing part, so that an electric arc generated when the fixed contacts are disconnected is fully dissipated in the process of passing through the embedded part, and the distance between the embedded part and the fixed contacts can be increased due to the existence of the spacing part, so that the embedded part can be embedded into the base at the position positioned on the outer peripheral side of the fixed contacts, and the inter-phase creepage distance is further increased to avoid inter-phase short circuits.

Further, the left side and the right side of the body portion are both provided with the spacing portions and the embedded portions, so that two spacing portions and two embedded portions are arranged between adjacent fixed contacts.

And the two spacing parts and the two embedding parts are arranged between the adjacent static contacts, so that the inter-phase creepage distance between the adjacent static contacts can be further increased.

Further, the body portion is abutted with the front side surface of the fixed contact, the spacing portion is arranged on the rear side relative to the body portion, a transition portion is arranged between the body portion and the spacing portion, and the transition portion is located on the left side and/or the right side of the fixed contact.

The transition part is located the left and right sides of static contact and can restrict the relative position between insulating part and the static contact to provide the preset position for the insulating part, the installation of the insulating part of being convenient for.

Further, the base is provided with a mounting hole penetrating the front-back direction by taking the direction vertical to the front-back direction and the left-right direction as the up-down direction, and the mounting hole is used for mounting the static contact assembly; the insulator is also provided with a body part, the body part is provided with a spacing part extending to the outer peripheral side of the static contact, and the body part extends upwards and is matched with the spacing part to cover the mounting hole of the base.

The mounting holes are plugged through the insulating piece, so that gas on the front side and the rear side of the mounting holes is communicated and disconnected, and the air tightness of the static contact structure is improved.

Further, the insulator is a gas generating sheet.

By integrating the insulating piece and the gas generating piece, the number of parts is reduced, the product structure is simplified, and the manufacturing cost is reduced.

The utility model also provides a frame-type circuit breaker, which comprises the static contact structure.

The utility model has the following beneficial effects: according to the utility model, the insulator extends to the outer peripheral side of the static contact and is provided with the embedded part embedded into the base, so that on one hand, the inter-phase creepage path extends to the rear side and turns to the front side, and compared with the creepage path in the prior art, the inter-phase creepage distance of the adjacent static contact is practically increased only through the surface of the base. In addition, the spacing part extending to the outer peripheral side of the static contact is matched with the body part extending upwards to seal the mounting hole of the base, so that the air tightness of the static contact structure is improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a prior art stationary contact structure.

Fig. 2 is an exploded view of embodiment 1 of the present utility model.

Fig. 3 is a structural diagram of embodiment 1 of the present utility model.

Fig. 4 is a base structure diagram of embodiment 1.

Fig. 5 is a perspective view (one) of the insulator of the present utility model.

Fig. 6 is a perspective view (two) of the insulator of the present utility model.

Fig. 7 is a block diagram of a stationary contact assembly of the present utility model.

Fig. 8 is a schematic cross-sectional view of the static contact structure of the present utility model, wherein a thick solid line represents a creepage path.

Fig. 9 is an exploded view of the circuit breaker of the present utility model.

Fig. 10 is a perspective view of the circuit breaker of the present utility model for illustrating a rear structure of the circuit breaker.

Fig. 11 is an internal structural view of the circuit breaker of the present utility model.

Fig. 12 is a partial cross-sectional view of the circuit breaker of the present utility model.

1 a base, 11 mounting holes, 12 cushion blocks, 2 a fixed contact assembly, 21 a fixed contact, 22 an insulating piece, 221 a body part, 222 an embedded part, 223 a spacing part, 224 shoulders, 225 a transition part, 23 an arc striking plate, 3 a moving contact, 31 a rotating shaft, 4 an external busbar, 5 an arc extinguishing chamber, 6 a front shell, 7 a moving contact driving structure and 71 springs.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

Example 1

Referring to fig. 2 to 4, as an embodiment of the present utility model, there is provided a static contact structure including an insulated base 1 and a plurality of static contact assemblies 2 disposed on the base, wherein a mounting hole 11 penetrating the base 1 in a front-rear direction is formed in the base 1, and the mounting hole 11 is used for mounting the static contact assemblies 2.

Referring to fig. 5-8, the static contact assembly 2 includes a static contact 21, an insulating member 22 and an arc striking plate 23, the static contact 21 is mounted on a mounting hole 11 of a base, one side surface of the static contact 21 is used for contacting or breaking with the moving contact 3, and the other side surface is used for being connected with an external busbar 4 (fig. 10). The insulating member 22 is made of an insulating material which is easy to generate gas at high temperature, so that the insulating member 22 forms a gas generating sheet with a gas generating function, and when the static contact is powered off, the gas generated by the insulating member 22 enables the gas pressure of the front side of the static contact 21 to be larger than the gas pressure of the rear side, namely the gas pressure of the front side of the insulating member 22 is larger than the gas pressure of the rear side. The lower end of the striking plate 23 is connected with the fixed contact 21 in a plug-in manner, and is used for guiding the arc generated by the fixed contact 21 to the arc extinguishing chamber 5 (fig. 11) above the fixed contact assembly 2. The insulator 22 includes a body portion 221 that abuts against the fixed contact 21, the body portion 221 extends upward and forms a groove for installing the striking plate 23, the upper end of the striking plate 23 is matched with the body portion 221 of the insulator 22, fixing holes are formed in the upper end of the striking plate 23 and the body portion 221, and the insulator 22 and the upper end of the striking plate 23 are fixedly connected with the base 1 through the fixing holes.

Taking one side of the insulating member 22, which is relatively far from the fixed contact 21, as the front side, and taking one side of the insulating member 22, which is relatively close to the fixed contact 21, as the rear side, of the insulating member 22, the rear side surface of the insulating member 22 is in contact with the fixed contact 21, the rear side surface of the insulating member 22 is convexly provided with an embedded part 222, the embedded part 222 is positioned on the outer peripheral side of the fixed contact 21, and the embedded part 222 is embedded into the base 1 to form embedded connection with the base 1, so that the embedded part 222 of the insulating member 22 is arranged between the adjacent fixed contacts 21, thereby increasing the inter-phase creepage distance. The insertion portion 222 is preferably inserted into the base 1 in a rearward extending manner so that the inter-phase arc extends in a direction of the insertion portion toward the rear side of the base, thereby increasing the inter-phase creepage distance, so that the arc is guided to the arc extinguishing chamber 5 with the arc striking plate 23 more, and inter-phase short circuit is avoided. Specifically, the rear side surface of the body portion 221 of the insulator 22 abuts against the fixed contact 21, the fixed contacts 21 are arranged at intervals in the left-right direction, the left and right sides of the body portion 221 are provided with the spacing portions 223 extending to the outer peripheral sides of the fixed contacts 21, such that the spacing portions 223 are located on the left and right sides of the fixed contacts 21, and the embedded portions 222 are provided protruding on the rear side surfaces of the spacing portions 223, so that the spacing portions 223 and the embedded portions 222 are provided between two adjacent fixed contacts 21. The body 221, the embedded portion 222 and the spacer 223 cooperate to wrap the left and right sides of the fixed contact 21 and partially cover the top, thereby forming an insulating member to entirely cover the periphery of the fixed contact.

Referring to fig. 8, taking a side of the embedded portion 222 relatively far from the fixed contact as an outer side, a shoulder 224 is disposed on an outer side surface of the embedded portion 222, and the shoulder 224 abuts against the base 1. The mounting hole 11 of the base 1 is internally provided with a cushion block 12 for fixing the static contact 21, and the embedded part 222 is inserted into a groove at the outer side of the cushion block 12, so that the boundary of the static contact 21 on the cushion block 12 is the starting point of a creepage path, wherein a thick solid line of a right enlarged view represents the creepage path, the creepage path extends to the embedded part 222 along the surface of the cushion block 12, extends to the shoulder 224 after crossing the embedded part 222, and then is diffused to the insulating piece 22 at the outer side of the adjacent static contact 21 along the front side surface of the base 1.

In fig. 8, for convenience of explanation, the creepage path is not shown in the enlarged view on the left side of the drawing, and is mainly used to indicate the positional relationship between the embedded portion 222 and the fixed contact 21 and the base 1, and the creepage path is shown in the enlarged view on the right side of the drawing by a thick solid line, so as to indicate the effect of the embedded portion 222 on increasing the inter-phase creepage distance.

Since the insertion portion 222 is protruded on the rear side surface of the spacer portion 223, the insertion portion 222 is extended rearward, and the shoulder portion 224 is provided on the front end of the insertion portion 222, and the shoulder portion 224 abuts the base 1, and the spacer portion 223 is also located on the front end of the insertion portion 222, the stability of the insulator 22 can be increased by the spacer portion 223 and the shoulder portion 224 provided on both side surfaces of the front end of the insertion portion 222.

In this embodiment, the left and right sides of the body 221 are provided with the spacer 223 and the embedded portion 222, so that two spacers 223 and embedded portions 222 are provided between adjacent fixed contacts 21. In other embodiments, the spacing portion 223 and the corresponding embedded portion 222 may be disposed only on the left side or the right side of the body portion 221, so that the distance between the adjacent fixed contacts 21 can be reduced when the inter-phase creepage distance is sufficient, and further the width of the fixed contact structure in the left-right direction can be reduced, and the structure of the insulating member 22 can be simplified. In order to further simplify the structure of the insulator 22, the embedded portion 222 and the spacer portion 223 outside the outermost stationary contact 21 can also be eliminated. The provision of only one spacer 223 and one embedded portion 222 between the adjacent fixed contacts 21, and the provision of two embedded portions 222 and two spacer 223 between the adjacent fixed contacts 21 can further increase the inter-phase creepage distance between the adjacent fixed contacts 21.

Referring to fig. 5-7, the body 221 abuts against the front surface of the fixed contact 21, the spacer 223 is disposed at the rear side with respect to the body 221, and a transition portion 225 is disposed between the body 221 and the spacer 223, and the transition portion 225 is disposed at the left and right sides of the fixed contact 21, so that the transition portion 225 can limit the relative position between the insulating member 22 and the fixed contact 21, thereby providing a predetermined position for the insulating member 22, and facilitating the installation of the insulating member 22.

Referring to fig. 3 and 4, the body 221 extends upward to form the gas generating sheet with the direction perpendicular to the front-rear direction and the left-right direction as the up-down direction, and the body 221 and the spacer 223 are matched to cover the mounting hole 11 of the base 1, so as to cover the gap between the static contact 21 and the mounting hole 11, that is, the mounting hole 11 is blocked by the insulating member 22, so that the gas communication at the front side and the rear side of the mounting hole 11 is disconnected, and the air tightness of the static contact structure is improved.

In the present embodiment, the insulating member 22 is made of a material that is easy to generate gas and extends upward to achieve the purpose of integrating with the gas generating sheet, thereby reducing the number of parts, simplifying the product structure and reducing the manufacturing cost. In addition, the insulator 22 of the present utility model has the embedded portion 222, the spacer 223 and the shoulder 224 on the outer peripheral side of the stationary contact 21, which are added to the gas generating sheet of the related art, so that the gas generating area can be increased, and the arc extinguishing effect can be improved. In other embodiments, the insulating member 22 and the gas generating sheet may be separated into at least two separate parts, so as to simplify the structure of the insulating member 22 and make it easier to manufacture, where the gas generating sheet may be a gas generating structure separated from the insulating member, but the gas generating structure should be disposed at the front side of the stationary contact 21, and the gas generated at high temperature makes the gas pressure at the front side of the stationary contact greater than the gas pressure at the rear side, that is, the gas pressure at the front side of the insulating member 22 is greater than the gas pressure at the rear side.

Example 2

The utility model also provides a frame-type circuit breaker, which is shown in fig. 9-12, and comprises a fixed contact structure, a movable contact 3, a front shell 6 and a movable contact driving structure 7, wherein the fixed contact structure, the movable contact 3 and the movable contact driving structure 7 are all arranged between the front shell 6 and the base 1 in the embodiment 1, and an arc extinguishing chamber 5 is further arranged between the front shell 6 and the base 1. The static contact structure is the static contact structure described in embodiment 1, and includes a base 1 and a static contact assembly 2 disposed on the base 1. The rear side of the base 1 is provided with an external busbar 4, and the external busbar 4 is used for being connected with an external power supply and a load, so that the fixed contact 21 is electrically connected with the external load or the external power supply. The moving contact 3 is opposite to the fixed contact 21, the moving contact driving structure 7 is used for driving the moving contact 3 to swing around the rotating shaft 31 so as to realize the closing or breaking of the moving contact 3 and the fixed contact 21, and the moving contact driving structure 7 also comprises a spring 71, wherein the spring 71 is used for realizing the over-travel contact of the moving contact 3 and the fixed contact 21. The arc extinguishing chamber 5 is used for extinguishing an electric arc generated when the movable contact 3 and the fixed contact 21 are disconnected, and in order to better extinguish the electric arc, an arc striking plate 23 of the fixed contact structure extends upwards into the arc extinguishing chamber 5.

The workflow of this embodiment is as follows:

the circuit breaker is closed: the circuit breaker is powered on, and the moving contact driving structure 7 drives the moving contact 3 to swing towards the direction approaching the fixed contact 21, so that the moving contact 3 and the fixed contact 21 are closed.

The breaker is opened: the circuit breaker is powered off, and the moving contact driving structure 7 drives the moving contact 3 to swing in a direction away from the fixed contact 21, so that the moving contact 3 is disconnected from the fixed contact 21. At the moment of breaking the moving contact 3 and the fixed contact 21, the gas generating sheet generates a large amount of gas, and the electric arc generated by breaking the moving contact 3 and the fixed contact 21 is led to the arc extinguishing chamber 5 through the arc striking plate 23 for arc extinguishing treatment. Referring to fig. 8, thick solid lines represent inter-phase creepage paths, and inter-phase arcs extend to adjacent fixed contacts 21 along the cushion block 12 of the base 1, the embedded portion 222 of the insulating member 22, the shoulder 224, and the front side of the base 1, so that sufficient inter-phase creepage distances are obtained between the fixed contacts 21, and inter-phase short circuits of the fixed contacts 21 are avoided.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (10)

1. The static contact structure comprises a base and a plurality of static contact components arranged on the base, and is characterized in that,

each static contact assembly comprises a static contact and an insulating piece, wherein one side of the insulating piece, which is relatively far away from the static contact, is used as a front part, one side of the insulating piece, which is relatively close to the static contact, is used as a rear part,

the surface of the insulating piece is convexly provided with an embedded part, the embedded part is positioned on the outer peripheral side of the static contact, the embedded part is embedded into the base, and the embedded part is positioned between adjacent static contacts, so that the inter-phase creepage distance is increased.

2. A stationary contact structure according to claim 1, wherein said insertion portion is inserted into the base in a rearward extending manner so that the inter-phase arc extends in a direction of the insertion portion toward the rear side of the base.

3. The static contact structure according to claim 1, wherein a side of the embedded portion, which is relatively far from the static contact, is taken as an outer side, and a shoulder is arranged on an outer side surface of the embedded portion and is abutted against the base.

4. A stationary contact structure according to claim 3, characterized in that said shoulder is provided at the front end of the embedded portion.

5. The stationary contact structure according to claim 1, wherein the insulating member is further provided with a body portion which abuts against the stationary contact; the static contacts are arranged at intervals along the left-right direction, the left side and/or the right side of the body part are/is provided with a spacing part extending to the outer periphery side of the static contacts, and the embedded part is convexly arranged on the rear side surface of the spacing part so that the embedded part is positioned between the adjacent static contacts.

6. The stationary contact structure according to claim 5, wherein the body portion is provided with the spacer portion and the embedded portion on both left and right sides thereof, such that two of the spacer portions and two of the embedded portions are provided between adjacent stationary contacts.

7. The stationary contact structure according to claim 5, wherein the body portion abuts against a front side surface of the stationary contact, the spacer portion is disposed at a rear side with respect to the body portion, a transition portion is disposed between the body portion and the spacer portion, and the transition portion is located at a left side and/or a right side of the stationary contact.

8. The static contact structure according to claim 1, wherein the static contacts are arranged at intervals along the left-right direction, the directions perpendicular to the front-back direction and the left-right direction are taken as the up-down directions, and the base is provided with mounting holes penetrating the front-back direction, wherein the mounting holes are used for mounting the static contact assemblies;

the insulator is also provided with a body part, the body part is provided with a spacing part extending to the outer peripheral side of the static contact, and the body part extends upwards and is matched with the spacing part to cover the mounting hole of the base.

9. A stationary contact structure according to any one of claims 1 to 8, characterized in that said insulating member is a gas generating sheet.

10. A frame circuit breaker comprising a stationary contact structure according to any of claims 1-9.