CN210575623U

CN210575623U - Switch

Info

Publication number: CN210575623U
Application number: CN201921581420.8U
Authority: CN
Inventors: 孙建波; 张洵初; 顾建青
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-05-19
Anticipated expiration: 2029-09-23

Abstract

A switch belongs to the technical field of low-voltage electrical appliances. The breaking unit comprises a unit shell, and a contact assembly and an arc extinguishing grid group which are arranged in the unit shell, and is characterized in that: the diapire of unit casing supports on the bottom internal surface of base, be provided with a spacing portion on the diapire surface of unit casing at least, be provided with corresponding cooperation portion in the spacing portion department that corresponds unit casing diapire on the diapire in the base, unit casing assembly into the base, spacing portion and cooperation portion mutually support the installation and have restricted the aversion of unit casing relative base. The advantages are that: the displacement of the breaking unit relative to the base is limited in the breaking process, the structural strength of the air outlet of the breaking unit is increased, and the gas leakage in the breaking process is reduced.

Description

Switch

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to switch.

Background

In the existing switching device such as a molded case circuit breaker, in order to improve breaking performance, a double-breakpoint independent breaking unit structure is often adopted, and after a multi-pole independent breaking unit is assembled into a whole, the multi-pole independent breaking unit and a base are assembled into a body unit, so that in order to ensure the assembly efficiency, the positioning fit clearance between the general independent breaking unit and the base is larger. As shown in fig. 1, the switch includes a base and a plurality of dividing units 100 installed in the base, wherein the bottom surface of the unit housing 1 of the dividing unit 100 is designed to be attached to the inner surface of the bottom of the base, the inner surface of the bottom of the base is substantially planar, and the surface of the bottom of the unit housing 1 is also planar. In a large-current breaking test, due to the fact that air pressure of an air outlet of the breaking unit is high, the breaking unit 100 is prone to shifting relative to the base, the unit shell 1 is damaged and even breaking fails, and breaking capacity of the switch is reduced.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the matching structure of the breaking unit and the base in the existing switch. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

Disclosure of Invention

The utility model aims to provide a switch, its cooperation part that divides disconnected unit and base has set up location structure, has restricted the aversion of the relative base of disconnected unit at disconnected in-process, has increased the structural strength who divides disconnected unit gas outlet department, reduces the gaseous leakage of disconnected process.

The utility model discloses a task is accomplished like this, a switch, including the base, hold operating device and at least one branch of dividing in the base and divide the unit, branch divide the unit all including unit casing and contact subassembly, the arc extinguishing bars group of setting in unit casing, its characterized in that: the diapire of unit casing supports on the bottom internal surface of base, be provided with a spacing portion on the diapire surface of unit casing at least, be provided with corresponding cooperation portion in the spacing portion department that corresponds unit casing diapire on the diapire in the base, unit casing assembly into the base, spacing portion and cooperation portion mutually support the installation and have restricted the aversion of unit casing relative base.

In a specific embodiment of the present invention, the spacing portion of the bottom wall of the unit housing and the engaging portion of the bottom wall of the base are engaged with each other in a concave-convex manner.

In another specific embodiment of the present invention, the spacing portion of the bottom wall of the unit housing is a convex structure and the fitting portion of the bottom wall of the base is a concave structure, or the spacing portion of the bottom wall of the unit housing is a concave structure and the fitting portion of the bottom wall of the base is a convex structure, and the size and the shape of the convex structure and the concave structure are matched.

In another embodiment of the present invention, the boss structure is integrally formed with the bottom wall of the unit housing or the bottom wall of the base or is assembled with the fastener after being separately formed.

In another specific embodiment of the present invention, the unit housing comprises a left breaking unit housing and a right breaking unit housing symmetrical to the left breaking unit housing, and the bottom wall of the left breaking unit housing and the bottom wall of the right breaking unit housing are supported on the bottom inner surface of the base.

In another specific embodiment of the present invention, the limiting portion of the bottom wall of the unit casing is formed by joining a left limiting portion on the left breaking unit casing and a right limiting portion on the right breaking unit casing.

In yet another specific embodiment of the present invention, the limiting portion of the bottom wall of the unit casing may also be formed by a left limiting portion on the left breaking unit casing or a right limiting portion on the right breaking unit casing.

In a more specific embodiment of the present invention, the spacing portion of the bottom wall of the unit housing and the fitting portion of the base are disposed near the gas outlet through which the gas generated by the arc flows.

In yet another specific embodiment of the present invention, the contact assembly includes a fixed contact and a movable contact module, the movable contact module includes a movable contact, the arc-extinguishing grid set corresponds to the fixed contact, the unit casing on constitute the gas outlet channel for releasing the arc high-temperature gas generated between the movable contact and the fixed contact when the switch is disconnected, the matching portion of the spacing portion and the base on the bottom wall of the unit casing is disposed at the position close to the gas outlet channel.

In a still more specific embodiment of the present invention, the number of the breaking units is equal to the number of poles of the switch, and the base is provided with a separating rib for separating the unit housings of the breaking units.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: compared with the existing molded case circuit breaker, the molded case circuit breaker has the advantages that the matching part of the breaking unit and the base is provided with the positioning structure of the limiting part and the matching part, particularly the concave-convex matching mode is adopted, and the function is to limit the displacement of the breaking unit relative to the base in the breaking process; and the limiting part and the matching part are arranged at a gas outlet through which gas generated by the electric arc flows, so that the structural strength of the gas outlet of the breaking unit is increased, the gas leakage in the breaking process of the switch can be reduced, and the gas pressure borne by the base is reduced.

Drawings

Fig. 1 is a perspective view of a plurality of breaking units arranged side by side of a switch according to the prior art.

Fig. 2 is an assembly schematic diagram of the switch of the present invention.

Fig. 3 is an exploded view of the switch of the present invention.

Fig. 4a is a schematic side perspective view of a plurality of breaking units arranged side by side of the switch of the present invention.

Fig. 4b is a schematic perspective view of another side of a plurality of breaking units arranged side by side of the switch of the present invention.

Fig. 5 is a schematic view of a base of the switch of the present invention.

Fig. 6 is a schematic diagram of the switch of the present invention showing the cooperation between the breaking unit and the base.

Fig. 7 is an explosion diagram of a breaking unit of the switch of the present invention.

In the figure: 1. the cell comprises a cell shell, 11, a left breaking cell shell, 111, a left limiting part, 12, a right breaking cell shell, 121, a right limiting part, 13, an air outlet channel, 131, a lower air outlet channel, 132, an upper air outlet channel and 14, a limiting part; 2. the contact assembly comprises a contact assembly, 21, a fixed contact, 211, a first fixed contact, 212, a second fixed contact, 22, a movable contact module, 221, a movable contact, 2211, a first movable contact, 2212, a second movable contact, 222, a rotor, 223, a shaft, 224 and a sliding sheet; 3. the arc extinguishing grid group comprises an arc extinguishing grid group 31, a first arc extinguishing grid group 32 and a second arc extinguishing grid group; 4. an arc striking sheet; 100. the breaking unit 200, the base 201, the matching part 202, the separating rib 300 and the operating mechanism.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 2 to 6, the present invention relates to a switch, which is a molded case circuit breaker, including a base 200, an operating mechanism 300 accommodated in the base 200, and a plurality of breaking units 100, wherein at least one of the breaking units 100 is disposed side by side, that is, the breaking units 100 have a plurality of parts. The structure of the breaking units 100 of each standard is similar or even identical under a certain shell and frame level. The breaking unit 100 comprises a unit shell 1, and a contact assembly 2, an arc extinguishing grid group 3 and an arc striking plate 4 which are arranged in the unit shell 1. The unit case 1 is composed of a left cutting unit case 11 and a right cutting unit case 12 symmetrical to the left cutting unit case 11, and the left cutting unit case 11 and the right cutting unit case 12 are formed by molding, are disposed to face each other, and are fixed together by fitting means (such as nuts and screws) to constitute the unit case 1. The left breaking unit shell 11 and the right breaking unit shell 12 are combined to form a bottom wall of the unit shell 1, the bottom wall is supported on the inner surface of the bottom of the base 200, at least one limiting part 14 is arranged on the outer surface of the bottom wall of the unit shell 1, and a corresponding matching part 201 is arranged on the bottom wall in the base 200 at the position corresponding to the limiting part 14 of the bottom wall of the unit shell 1. Spacing portion 14 and cooperation portion 201 can adopt unsmooth complex mode, in this embodiment, spacing portion 14 of unit casing 1 diapire set up to the lug boss structure, it is corresponding, cooperation portion 201 of base 200 diapire sets up to groove structure, lug boss structure and groove structure's size and shape phase-match. When the unit housing 1 is assembled into the base 200, the mutual matching installation of the boss structure and the groove structure limits the displacement of the unit housing 1 relative to the base 200. Of course, the position-limiting part 14 of the bottom wall of the unit housing 1 may also be configured as a groove structure, and correspondingly, the matching part 201 of the bottom wall of the base 200 may be configured as a boss structure matched with the groove structure of the position-limiting part 14 in size and shape. The boss structure is integrally formed with the bottom wall of the unit case 1 or the bottom wall of the base 200 or is assembled into a whole by a fastening member after being separately formed. The number of the breaking units 100 is equal to the number of poles of the switch, and the base 200 is provided with a spacer rib 202 for separating the unit housings 1 of the breaking units 100. The limiting part 14 of the bottom wall of the unit housing 1 is formed by splicing a left limiting part 111 on the left breaking unit housing 11 and a right limiting part 121 on the right breaking unit housing 12, and of course, the limiting part 14 of the bottom wall of the unit housing 1 can also be formed by the left limiting part 111 on the left breaking unit housing 11 or the right limiting part 121 on the right breaking unit housing 12 alone, that is, one of the parts is selected.

As shown in fig. 4a, 4b to 7, the contact assembly 2 includes a fixed contact 21 and a movable contact module 22, the fixed contact 21 includes a first fixed contact 211 and a second fixed contact 212, and the first fixed contact 211 and the second fixed contact 212 form a diagonal position relationship, for example, in this embodiment, the first fixed contact 211 is located at the upper right portion in the unit housing 1, and the second fixed contact 212 is located at the lower left portion in the unit housing 1. The movable contact module 22 includes a rotor 222 and two movable contacts 221 disposed on the radial direction of the rotor 222, where the movable contacts 221 are a first movable contact 2211 and a second movable contact 2212 correspondingly matched with the first stationary contact 211 and the second stationary contact 212, respectively. A shaft 223 and a sliding piece 224 are respectively arranged at two axial sides of the rotor 221, and the rotor 221 can be driven by the operating mechanism 300 to rotate, so that the movable contact 221 and the fixed contact 21 are separated or contacted; the structure of the rotary double break point is shown in the figure, but it can also be a single break point structure, that is, only one set of moving and static contacts, and the double break point structure is taken as an example in this embodiment. The arc extinguishing grid group 3 is composed of a plurality of arc extinguishing grid pieces which are arranged in a stacked mode, a pair of arc extinguishing grid pieces 5 are arranged and are respectively arranged at two static contacts 21, and the arc extinguishing grid pieces 3 are used for extinguishing electric arcs generated in the process that the movable contacts 221 and the static contacts 21 repel each other. Specifically, the arc-extinguishing grid set 3 includes a first arc-extinguishing grid set 31 corresponding to a lower position of the first fixed contact 211, and a second arc-extinguishing grid set 32 corresponding to an upper position of the second fixed contact 212. An air outlet channel 13 for releasing arc high-temperature gas generated between the moving contact 221 and the static contact 21 when the switch is disconnected is formed on the unit shell 1 at a position close to the arc extinguishing grid group 3. The air outlet channel 13 includes a lower air outlet channel 131 near the first arc chute group 31, and an upper air outlet channel 132 near the second arc chute group 32. And the unit shell 1 is provided with an arc striking sheet 4 for enhancing the arc extinguishing performance. The switch may also be provided with a trip device for actuating the operating mechanism 300 in the event of an overload and/or short-circuit fault. The operating mechanism 300 is coupled to the contact assembly 2 to control the contact assembly 2. The position-limiting part 14 of the bottom wall of the unit housing 1 and the fitting part 201 of the base 200 are disposed near the gas outlet through which the gas generated by the arc flows, and in this embodiment, the position-limiting part 14 of the unit housing 1 and the fitting part 201 of the base 200 are disposed near the lower gas outlet channel 131.

Claims

1. A switch comprises a base (200), an operating mechanism (300) accommodated in the base (200) and at least one breaking unit (100), wherein each breaking unit (100) comprises a unit shell (1), a contact assembly (2) arranged in the unit shell (1), and an arc extinguishing grid group (3), and is characterized in that: the diapire of unit casing (1) supports on the bottom internal surface of base (200), be provided with one spacing portion (14) at least on the diapire surface of unit casing (1), be provided with corresponding cooperation portion (201) in spacing portion (14) department that corresponds unit casing (1) diapire on the diapire in base (200), unit casing (1) when assembling into base (200), spacing portion (14) and cooperation portion (201) mutually support the installation and have restricted the aversion of unit casing (1) relative base (200).

2. A switch according to claim 1, wherein the position-limiting portion (14) of the bottom wall of the unit case (1) and the engaging portion (201) of the bottom wall of the base (200) are engaged with each other in a concavo-convex manner.

3. A switch according to claim 2, characterized in that the position-limiting portion (14) of the bottom wall of the unit case (1) is of a convex structure and the engaging portion (201) of the bottom wall of the base (200) is of a concave structure, or the position-limiting portion (14) of the bottom wall of the unit case (1) is of a concave structure and the engaging portion (201) of the bottom wall of the base (200) is of a convex structure, the convex structure and the concave structure being matched in size and shape.

4. A switch according to claim 3, wherein the boss structure is integrally formed with the bottom wall of the unit case (1) or the bottom wall of the base (200) or is separately formed and then assembled with a fastener.

5. A switch according to claim 1, wherein said unit case (1) is composed of a left breaking unit case (11) and a right breaking unit case (12) symmetrical to the left breaking unit case (11), said left breaking unit case (11) and right breaking unit case (12) being combined to form a bottom wall of the unit case (1) supported on a bottom inner surface of the base (200).

6. A switch according to claim 5, characterized in that the limiting part (14) of the bottom wall of the unit case (1) is formed by splicing a left limiting part (111) on the left breaking unit case (11) and a right limiting part (121) on the right breaking unit case (12).

7. A switch according to claim 5, characterized in that the limiting part (14) of the bottom wall of the unit case (1) can be formed by a left limiting part (111) on the left breaking unit case (11) or a right limiting part (121) on the right breaking unit case (12) separately.

8. A switch according to claim 1, wherein the stopper portion (14) of the bottom wall of the unit case (1) and the fitting portion (201) of the base (200) are disposed near the outlet through which gas generated by the arc flows.

9. The switch according to claim 8, wherein the contact assembly (2) comprises a fixed contact (21) and a movable contact module (22), the movable contact module (22) comprises a movable contact (221), the arc-extinguishing grid set (3) corresponds to the fixed contact (21), an air outlet channel (13) for releasing arc high-temperature gas generated between the movable contact (221) and the fixed contact (21) when the switch is disconnected is formed on the unit housing (1) at a position close to the arc-extinguishing grid set (3), and the limiting portion (14) on the bottom wall of the unit housing (1) and the matching portion (201) of the base (200) are arranged at a position close to the air outlet channel (13).

10. A switch according to claim 1, characterized in that the number of said breaking units (100) is equal to the number of poles of the switch, and that in said base (200) there are provided spacer ribs (202) for separating the unit housings (1) of the respective breaking units (100).