CN210378920U

CN210378920U - Compact low-voltage circuit breaker

Info

Publication number: CN210378920U
Application number: CN201921312143.0U
Authority: CN
Inventors: 张赛蒙
Original assignee: Guangdong Huacheng Electric Co ltd
Current assignee: Guangdong Huacheng Electric Co ltd
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2020-04-21
Anticipated expiration: 2029-08-14

Abstract

The utility model provides a compact low-voltage circuit breaker, including circuit breaker body, switch, moving contact, static contact, tripping device, solenoid, explosion chamber and bimetallic strip, the switch articulates in the circuit breaker body, and has the protrusion the portion of stirring outside the circuit breaker body, the switch articulates in the circuit breaker body, and still articulate in the one end of moving contact; the latching mechanism is hinged to the circuit breaker body, the moving contact is hinged to the circuit breaker body, a plurality of cavities are formed in two sides in the circuit breaker body respectively, at least one opening is formed in the upper surface of each cavity, and wiring ports facing the two sides are formed in the cavities; the upper side of the first cavity is provided with a mounting cavity for mounting a wiring part. The utility model discloses compact structure can greatly save installation space.

Description

Compact low-voltage circuit breaker

Technical Field

The utility model relates to a circuit breaker field particularly, relates to a compact low voltage circuit breaker.

Background

The low-voltage circuit breakers are important components of a low-voltage power distribution system and have a current protection function, but in the installation process, the distance between the circuit breakers in each row depends on the distance required by a maximum-scale device, and the fact that the length of the grounding circuit breaker is larger than that of a standard circuit breaker means that the space between the circuit breakers in each row is wasted.

A large number of typical prior arts are found through retrieval, for example, patent CN105590807B, which provides a compact ground fault circuit breaker, including a base, an upper cover, a middle frame, a support resetting mechanism, an electromagnetic tripping mechanism, a contact assembly, a grounding assembly, a power input and output connection assembly, a PCB board and a circuit breaker, wherein the circuit breaker circuit includes a power circuit, a leakage ground detection circuit, a signal amplification and shaping circuit, a single-chip microcomputer control circuit, a power detection and work indication circuit, a tripping mechanism control circuit and a reverse wiring protection circuit, and the electromagnetic tripping mechanism is controlled by the leakage ground detection circuit to operate; the reverse wiring protection circuit comprises a reed switch and a relay, wherein the relay is arranged along the length direction of the ground fault circuit breaker according to the iron core direction of the relay; the power input and output connecting component structure comprises a fixed piece, a movable piece and a connecting structure, wherein the movable piece is positioned on the outer side of the fixed piece and is connected with the fixed piece in an attaching way through the connecting structure; the PCB is one piece. Or be equipped with 4 magnetic conduction boards in the miniature circuit breaker mainly solving present patent CN110071022A, increased the cost on the one hand like this, on the other hand also comparatively bloated problem in the structure, include in the aspect of the technical point be equipped with first magnetic conduction piece (61), second magnetic conduction piece (62) and third magnetic conduction piece (63) in the casing, be equipped with recess (21) on the base plate, first magnetic conduction piece is located in recess (21), second magnetic conduction piece is located in the first cavity, third magnetic conduction piece is located in the second cavity, first magnetic conduction piece with form first magnetic field between the second magnetic conduction piece, first magnetic conduction piece with form the second magnetic field between the third magnetic conduction piece. The invention provides a compact-structure miniature circuit breaker, wherein a first magnetic field is formed between a first magnetic conductive sheet and a second magnetic conductive sheet, and a second magnetic field is formed between the first magnetic conductive sheet and a third magnetic conductive sheet, so that one magnetic conductive sheet is omitted, and the cost and the installation space are saved. As another typical case GB2381968B, there is provided a ground circuit breaker comprising: a housing; a circuit interrupting mechanism having line side and load side neutral terminals, a load side and load side neutral terminal, and a set of contacts between the line side terminals and the load side terminals, each line side terminal being divided into a line side external terminal and a line side internal auxiliary terminal adjacent the line side external terminal in the housing, and the set of contacts being connected to a respective line side internal auxiliary terminal; and a ground detection circuit including a toroidal sense core disposed about the live and neutral lines extending between the line side live terminal, the line side neutral terminal, and the set of contacts. The live and neutral wires are shaped to extend between the line side live and line side neutral terminals, through the toroidal sensing core, to respective line side internal auxiliary terminals in the housing, such that the housing receives the toroidal sensing core in a compact configuration.

Therefore, how to improve the structure of the circuit breaker to adapt to the more tiny application field of the circuit breaker, many practical problems to be dealt with urgently in the practical application of the circuit breaker still have unreported specific solutions.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiency of the prior art, the utility model provides a compact low-voltage circuit breaker, the specific technical scheme of the utility model as follows:

a compact low-voltage circuit breaker comprises a circuit breaker body, a switch, a moving contact, a fixed contact, a tripping mechanism, an electromagnetic coil, an arc extinguish chamber and a bimetallic strip, wherein the switch is hinged to the circuit breaker body and provided with a toggle part protruding out of the circuit breaker body; the tripping mechanism is hinged to the circuit breaker body, the moving contact is hinged to the circuit breaker body, a plurality of cavities are respectively arranged on two sides in the circuit breaker body, at least one opening is formed in the upper surface of each cavity, and wiring ports facing the two sides are formed in the cavities; the upper side of the first cavity is provided with a mounting cavity for mounting a wiring part; the wiring portion includes a plurality of fixed knot construct and at least one chucking structure, the chucking structure has a pivot, just the pivot both ends connect in fixed knot constructs, and has the part and pass through an opening protrusion extremely the cavity, when the external power source line by the wiring mouth gets into during the cavity, it is right to accomplish the chucking of external power source line.

Optionally, the fixing structure includes: the fixing elastic element, the first connecting part and the second connecting part are arranged in the same accommodating cavity, wherein two ends of the fixing elastic element are respectively arranged on the lower surface of the first connecting part and the upper surface of the second connecting part, and the lower surface of the second connecting part is abutted to the rotating shaft; and one end of the static contact is connected with the first connecting part or the second connecting part, and the other end of the static contact is matched with the moving contact to complete the on-off of the circuit.

Optionally, the fixing structure further includes: the pressing structure is fixedly connected with the upper surface of the first connecting part and used for acting on the first connecting part to move towards the contraction direction of the fixed elastic element; the clamping structure is used for clamping the first connecting part after the first connecting part moves a certain distance towards the direction in which the fixed elastic element contracts; the releasing structure is fixedly connected with the pressing structure and used for acting on the clamping structure to enable the first connecting part to move towards the direction in which the fixed elastic element extends.

Optionally, the pressing structure includes: the pressing device comprises a pressing action part, a pressing connecting part and a pressing external connection action part, wherein one end of the pressing action part is fixedly connected with the first connecting part, and the pressing action part at least comprises an action rod; the other end of the pressing action is fixedly connected with the pressing connecting part, and two ends of the pressing connecting part are fixedly connected; and a second opening is formed in the outer side of the breaker body and used for enabling the pressing external action part to extend out.

Optionally, the clamping structure includes: joint elastic element, joint portion, wherein, joint elastic element's one end fixed connection in circuit breaker body, the other end with joint portion fixed connection works as push down the effect portion and push down first connecting portion to fixed elastic element shrink direction motion certain distance back, joint portion plays the joint and catches first connecting portion.

Optionally, the releasing structure includes: the socket pipe is fixedly arranged on one side of the pressing action part, the releasing action rod is movably arranged inside the socket pipe and works as the clamping part is clamped in the first connecting part, the releasing action rod can act on the clamping part to enable the clamping part to move in the direction of the contraction of the clamping elastic element.

The utility model discloses the beneficial effect who gains includes: 1. acting force is applied to the clamping structure through the fixed elastic element, so that an external power line is clamped more easily, and the clamping operation of the external power line is greatly improved; 2. the circuit breaker adopts a clamping structure to replace the traditional binding post, so that the structure is compact and the use is convenient; 3. the convenience of wiring is improved, and the cable core is effectively prevented from automatically falling off; 4. saving cost and installation space.

Drawings

A further understanding of the invention may be realized by reference to the following description taken in conjunction with the accompanying drawings, the emphasis instead being placed upon illustrating the principles of the embodiments.

Fig. 1 is a schematic structural diagram of a compact low-voltage circuit breaker according to an embodiment of the present invention;

fig. 2 is a front view of a clamping structure in a compact low-voltage circuit breaker according to one embodiment of the present invention;

fig. 3 is a side view of a clamping structure in a compact low-voltage circuit breaker according to one embodiment of the invention;

fig. 4 is a schematic structural diagram of a clamping structure in a compact low-voltage circuit breaker according to an embodiment of the present invention;

fig. 5 is a perspective view of a compact low-voltage circuit breaker according to an embodiment of the present invention.

Description of reference numerals: 1. a circuit breaker body; 2. a switch; 3. a moving contact; 4. static contact; 5. a tripping mechanism; 6. an electromagnetic coil; 7. a wiring portion; 8. a bimetal; 9. an arc extinguishing chamber; 701. fixing the elastic element; 702. a fixed structure; 703. a clamping structure; 704. a press-down structure; 705. a first connection portion; 706. a second connecting portion; 707. a clamping structure; 708. pressing the external connection action part; 709. a release structure; 710. and a wiring port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention will be further described in detail with reference to the following embodiments thereof; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc., indicating directions or positional relationships based on those shown in the drawings, it is only for convenience of description and simplicity of description, but not for indicating or implying that the indicated device or component must have a specific direction, be constructed in a specific direction, and operate, and therefore the terms describing the positional relationships in the drawings are used for illustrative purposes only and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the above terms according to specific situations.

The utility model relates to a compact low-voltage circuit breaker, according to the following embodiment of the illustrated explanation of figures 1-5:

the first embodiment is as follows:

the embodiment provides a compact low-voltage circuit breaker, which comprises a circuit breaker body 1, a switch 2, a moving contact 3, a static contact 4, a tripping mechanism 5, an electromagnetic coil 6, an arc extinguish chamber 9 and a bimetallic strip 8, wherein the switch 2 is hinged to the circuit breaker body 1 and is provided with a toggle part protruding out of the circuit breaker body 1, and the switch 2 is hinged to the circuit breaker body 1 and is also hinged to one end of the moving contact 3; the tripping mechanism 5 is hinged to the circuit breaker body 1, and the moving contact 3 is hinged to the circuit breaker body 1. The existing circuit breaker adopts a wiring terminal mode to fasten an external power line, and the operation usually needs a screwdriver or other tools to operate a screw nail, so that the power line is clamped or released, and when the tools lack the screwdriver, the power line cannot be taken out or installed, so that the operation is very troublesome, and the working efficiency is greatly reduced, so that a plurality of cavities are respectively arranged at two sides in the circuit breaker body 1, the upper surface of each cavity is at least provided with a first opening, and the cavities are also provided with wiring ports 710 facing the two sides, so that the external power line enters the cavities from the wiring ports 710 and is clamped; the upper side of the first cavity is provided with a mounting cavity for mounting a wiring part 7; the wiring portion 7 includes at least two fixing structures 702 and at least one chucking structure 703, the chucking structure 703 has a pivot, and the fixing structure 702 has a pivot adaptation opening for placing the pivot, just the pivot both ends connect in the pivot adaptation opening of fixing structure 702, and have the part to pass through an opening protrusion extremely the cavity, when the external power cord by wiring mouth 710 gets into during the cavity, it is right to accomplish the chucking of external power cord, wiring mouth 710 can be square mouth or circular mouth. The clamping structure 703 is a ratchet made of metal, the rotating shaft is also a metal rotating shaft, and the clamping structure 703 and the rotating shaft are integrally made.

Wherein the fixing structure 702 comprises: a fixed elastic element 701, a first connection part 705 and a second connection part 706, which are disposed in the same accommodating cavity, wherein two ends of the fixed elastic element 701 are respectively disposed on a lower surface of the first connection part 705 and an upper surface of the second connection part 706, and a lower surface of the second connection part 706 is abutted to the rotating shaft; and one end of the static contact 4 is connected to the first connecting portion 705 or the second connecting portion 706, and the other end is configured to be matched with the moving contact, so as to complete the connection or disconnection of the circuit. Preferably, the fixed elastic element 701 is a metal spring, such as a spring made of steel, copper or iron; the first connection portion 705 and the second connection portion 706 are metal sheets made of metal, such as steel, copper, or iron.

In addition, the fixing structure further includes: the pressing structure 704 is fixedly connected with the upper surface of the first connecting portion 705, and is used for acting on the first connecting portion 705 to move towards the direction in which the fixed elastic element 701 contracts; the clamping structure 707 is configured to perform clamping operation on the first connection portion 705 after the first connection portion 705 moves a certain distance in a direction in which the fixed elastic element 701 contracts; the releasing structure 709 is fixedly connected to the pressing structure 704, and is configured to act on the clamping structure 707 to move the first connecting portion 705 toward the direction in which the fixed elastic element 701 extends.

Specifically, the pressing structure 704 includes: a pressing action part, a pressing connection part and a pressing external connection action part 708, wherein one end of the pressing action part is fixedly connected with the first connection part, and the pressing action part at least comprises an action rod; the other end of the pressing action is fixedly connected with the pressing connecting part, and two ends of the pressing connecting part are fixedly connected; the outer side of the circuit breaker body 1 is provided with a second opening for the pressing external action part 708 to extend out. The pressing action part comprises at least one connecting rod, and the connecting rod is used for being vertically and fixedly connected to the first connecting part 705 to better exert force on the first connecting part 705, so that the first connecting part 705 moves to enable the fixed elastic element to contract, and thus better exert force on the rotating shaft, and further the clamping structure 703 can better act on an external power line to better clamp the power line.

Specifically, the clamping structure 707 includes: joint elastic element, joint portion, wherein, joint elastic element's one end fixed connection in the intracavity is installed to the joint elastic element on 1 surface of circuit breaker body, and this joint elastic element installs the intracavity and has bellied annular ring, be used for this annular ring is passed to joint elastic element's one end, accomplishes fixed connection, and the other end passes fixed orifices fixed connection in the joint portion works as it pushes down the effect portion and pushes down first connecting portion 705 to after fixed elastic element contraction direction movement certain distance, joint portion bullet goes out the joint and catches first connecting portion 705. Preferably, the elastic connectable element may be a metal spring or a non-metal elastic element, such as a spring made of steel, copper or iron, or a high carbon spring. The clamping portion can be a square clamping block or a cylindrical clamping block, can move towards the stretching or compressing direction of the elastic element, and when the sugar and vinegar clamp the first connecting portion 705, the clamping elastic element is in a free state.

Specifically, the release structure 709 includes: the socket pipe and the release action rod are fixedly arranged on one side of the pressing action part, the release action rod is movably arranged inside the socket pipe and is clamped in the clamping part in the first connecting part 705, and the release action rod can act on the clamping part to enable the clamping part to move in the direction of contraction of the clamping elastic element.

Example two:

the embodiment provides a compact low-voltage circuit breaker, which comprises a circuit breaker body 1, a switch 2, a moving contact 3, a static contact 4, a tripping mechanism 5, an electromagnetic coil 6, an arc extinguish chamber 9 and a bimetallic strip 8, wherein the switch 2 is hinged to the circuit breaker body 1 and is provided with a toggle part protruding out of the circuit breaker body 1, and the switch 2 is hinged to the circuit breaker body 1 and is also hinged to one end of the moving contact 3; the tripping mechanism 5 is hinged to the circuit breaker body 1, and the moving contact 3 is hinged to the circuit breaker body 1. The existing circuit breaker adopts a wiring terminal mode to fasten an external power line, and the operation usually needs a screwdriver or other tools to operate a screw nail, so that the power line is clamped or released, and when the tools lack the screwdriver, the power line cannot be taken out or installed, so that the operation is very troublesome, and the working efficiency is greatly reduced, so that a plurality of cavities are respectively arranged at two sides in the circuit breaker body 1, the upper surface of each cavity is at least provided with a first opening, and the cavities are also provided with wiring ports 710 facing the two sides, so that the external power line enters the cavities from the wiring ports 710 and is clamped; the upper side of the first cavity is provided with a mounting cavity for mounting a wiring part 7; the wiring portion 7 includes at least two fixing structures 702 and at least one chucking structure 703, the chucking structure 703 has a pivot, and the fixing structure 702 has a pivot adaptation opening for placing the pivot, just the pivot both ends connect in the pivot adaptation opening of fixing structure 702, and have the part to pass through an opening protrusion extremely the cavity, when the external power cord by wiring mouth 710 gets into during the cavity, it is right to accomplish the chucking of external power cord, wiring mouth 710 can be square mouth or circular mouth. The clamping structure 703 is a ratchet made of metal, the rotating shaft is also a metal rotating shaft, the clamping structure 703 and the rotating shaft are integrally made, the size of the ratchet in the cavities at two sides of the circuit breaker is opposite to the tooth shape direction in the setting process, namely, if the tooth shape direction of the ratchet at one side is anticlockwise set, the tooth shape direction of the ratchet at the other side is clockwise set.

Specifically, the pressing structure 704 includes: a pressing action part, a pressing connection part and a pressing external connection action part 708, wherein one end of the pressing action part is fixedly connected with the first connection part, and the pressing action part at least comprises an action rod; the other end of the pressing action is fixedly connected with the pressing connecting part, and two ends of the pressing connecting part are fixedly connected; the outer side of the circuit breaker body 1 is provided with a second opening for the pressing external action part 708 to extend out. The pressing action part comprises at least one connecting rod, and the connecting rod is used for being vertically and fixedly connected to the first connecting part 705 to better exert force on the first connecting part 705, so that the first connecting part 705 moves to enable the fixed elastic element to contract, and thus better exert force on the rotating shaft, and further the clamping structure 703 can better act on an external power line to better clamp the power line. The end of the pressing external connection action part 708 is sleeved with a plastic cap.

Specifically, the release structure 709 includes: the socket pipe and the release action rod are fixedly arranged on one side of the pressing action part, the release action rod is movably arranged inside the socket pipe and is clamped in the clamping part in the first connecting part 705, and the release action rod can act on the clamping part to enable the clamping part to move in the direction of contraction of the clamping elastic element. The socket pipe with the effect portion that pushes down designs as an organic whole, just the socket pipe hugs closely the opening of the one end of circuit breaker side is than the principle the opening of the one end of circuit breaker side is little, for the socket pipe, work as the release effect pole cup joints in when the socket pipe is inside the little open end of socket pipe and be close to the diameter of the release effect pole of circuit breaker side is less than the diameter of the release effect pole of the little open end opposite side of socket pipe, and then the release effect pole can be blocked by the little opening of socket pipe. The tail end of the small-diameter end of the release action rod is sleeved with a plastic cap. The release action lever may also be made of a rigid plastic.

To sum up, the utility model discloses a compact low-voltage circuit breaker, produced beneficial technological effect includes: 1. acting force is applied to the clamping structure through the fixed elastic element, so that an external power line is clamped more easily, and the clamping operation efficiency of the external power line is greatly improved; 2. the circuit breaker adopts a clamping structure to replace the traditional binding post, so that the structure is compact and the use is convenient; 3. the convenience of wiring is promoted, and the cable core is effectively prevented from automatically falling off.

Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples, and various configurations may omit, replace, or add various processes or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Furthermore, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.

Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, such as well-known circuits, processes, algorithms, structures, and techniques, which have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.

It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be understood as merely illustrative of the present invention and not as limiting the scope of the invention. After reading the description of the present invention, the skilled person can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope of the present invention defined by the claims.

Claims

1. A compact low-voltage circuit breaker comprises a circuit breaker body (1), a switch (2), a moving contact (3), a static contact (4), a tripping mechanism (5), an electromagnetic coil (6), an arc extinguish chamber (9) and a bimetallic strip (8), wherein the switch (2) is hinged to the circuit breaker body (1), is provided with a toggle part protruding out of the circuit breaker body (1) and is also hinged to one end of the moving contact (3); the tripping device is characterized in that a plurality of cavities are respectively arranged on two sides in the breaker body (1), the upper surface of each cavity is at least provided with a first opening, and the cavity is also provided with wiring ports (710) facing the two sides; the upper side of the first cavity is provided with a mounting cavity for mounting a wiring part (7); the wiring portion (7) comprises a plurality of fixing structures (702) and at least one clamping structure (703), the clamping structure (703) is provided with a rotating shaft, two ends of the rotating shaft are connected to the fixing structures (702), a part of the rotating shaft is provided with a protrusion extending to the cavity through the opening, and when an external power line enters the cavity through the wiring port (710), the clamping of the external power line is completed.

2. Compact low-voltage circuit breaker according to claim 1, characterized in that said fixed structure (702) comprises: the fixing elastic element (701), the first connecting part (705) and the second connecting part (706) are arranged in the same accommodating cavity, wherein two ends of the fixing elastic element (701) are respectively arranged on the lower surface of the first connecting part (705) and the upper surface of the second connecting part (706), and the lower surface of the second connecting part (706) is abutted to the rotating shaft; and one end of the static contact (4) is connected with the first connecting part (705) or the second connecting part (706), and the other end of the static contact is matched with the moving contact to complete the conduction or the disconnection of a circuit.

3. Compact low-voltage circuit breaker according to claim 2, characterized in that said fixed structure further comprises: the pressing structure (704) is fixedly connected with the upper surface of the first connecting portion (705), and is used for acting on the first connecting portion (705) to move towards the contraction direction of the fixed elastic element (701); the clamping structure (707) is used for clamping the first connecting part (705) after the first connecting part (705) moves for a certain distance towards the contraction direction of the fixed elastic element (701); the releasing structure (709) is fixedly connected with the pressing structure (704) and used for acting on the clamping structure (707) to enable the first connecting part (705) to move towards the stretching direction of the fixed elastic element (701).

4. The compact low-voltage circuit breaker according to claim 3, characterized in that said push-down structure (704) comprises: the pressing device comprises a pressing action part, a pressing connecting part and a pressing external connection action part (708), wherein one end of the pressing action part is fixedly connected with the first connecting part, and the pressing action part at least comprises an action rod; the other end of the pressing action is fixedly connected with the pressing connecting part, and two ends of the pressing connecting part are fixedly connected; and a second opening is formed in the outer side of the breaker body (1) and used for enabling the pressing external action part (708) to extend out.

5. Compact low-voltage circuit breaker according to claim 3, characterized in that said snap-in structure (707) comprises: joint elastic element, joint portion, wherein, joint elastic element's one end fixed connection in circuit breaker body (1), the other end with joint portion fixed connection works as the pressing effect portion pushes down first connecting portion (705) to fixed elastic element contraction direction moves after the certain distance, joint portion plays the joint and catches first connecting portion (705).

6. Compact low-voltage circuit breaker according to claim 5, characterized in that said release structure (709) comprises: the socket pipe comprises a socket pipe body and a release action rod, wherein the socket pipe body is fixedly arranged on one side of the pressing action portion, the release action rod is movably arranged inside the socket pipe body, and the release action rod can act on the clamping portion to enable the clamping portion to move in the direction of contraction of the clamping elastic element when the clamping portion is clamped to the first connecting portion (705).