CN111785573A

CN111785573A - Load break switch

Info

Publication number: CN111785573A
Application number: CN202010646840.0A
Authority: CN
Inventors: 刘亚南; 吴越; 徐永富; 韦尚靖; 吴昊
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2020-10-16

Abstract

The invention relates to the field of low-voltage electrical appliances, in particular to a load break switch, wherein a switch shell of the load break switch comprises a cover body and a shell main body, wherein the cover body is arranged on one side of the shell main body; the load break switch also comprises a first locking mechanism in driving fit with the operating mechanism; when the operating mechanism is operated to switch on the load break switch, the first locking mechanism moves and is in locking fit with the cover body to prevent the cover body from being opened, and when the operating mechanism is shifted to switch off the load break switch, the operating mechanism drives the first locking mechanism to move to remove the locking fit with the cover body; the load break switch of the invention has high safety.

Description

Load break switch

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a load break switch, which is provided with a strip-shaped shell, and each phase circuit is connected with a fuse in series.

Background

The load break switch is provided with an energy storage isolating switch and a pluggable fuse set, and is an important switching device for connecting/disconnecting a power distribution system; in order to cut off the input current and the load end, a user can manually operate a power handle of the operating mechanism to cut off a movable/static contact inside the load break switch.

The existing load break switch has the following problems:

1. the moving contact system of the existing load break switch mostly adopts a sliding arrangement mode, and the existing load break switch is easy to wear after long-time use, thereby influencing the reliability and the fluency of the action of the load break switch.

2. The existing load break switch is not provided with a reliable locking protection mechanism, the situation that the shell is closed under the opening state of the shell or the shell is opened under the closing state of the shell is easy to occur, and the power utilization safety of a user is seriously influenced.

3. The movable contact assembly and the contact support of the movable contact system of the existing load break switch are not firmly assembled, so that the condition that the movable contact assembly is separated from the contact support is easy to happen, and the load break switch is failed.

4. The existing load break switch has insufficient arc extinguishing efficiency of an arc extinguishing chamber, a product is easy to generate larger electric arc when being switched on/off, and the larger arcing is easy to cause potential safety hazard of a circuit; in addition, the arc extinguishing grid piece fixing and limiting structure of the arc extinguishing chamber is complex and is not easy to install.

5. The existing load break switch has a complex switch mounting structure and is not easy to operate.

6. The current load break switch has the disadvantages that the arrangement mode of the output end is unreasonable, the specification of the output end is small, the current carrying capacity of the load break switch is limited, and the wiring is inconvenient.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a load break switch which is high in safety.

In order to achieve the purpose, the invention adopts the following technical scheme:

a load break switch comprises a switch shell 1, an operating mechanism 2 and a contact system, wherein the operating mechanism 2 and the contact system are respectively arranged in the switch shell 1; the operating mechanism 2 comprises a power handle 20, the contact system comprises a moving contact system and a static contact 8 which are matched with each other, and the moving contact system comprises a contact support 5 and a moving contact component 6 arranged on the contact support 5; the power handle 20 is toggled to drive the moving contact system to move in a reciprocating manner, so that the moving contact assembly 6 and the static contact 8 are closed/disconnected;

the switch shell 1 comprises a cover body 11 and a shell main body 12, wherein the cover body 11 is arranged on one side of the shell main body 12;

the load break switch also comprises a first locking mechanism 3 in driving fit with the operating mechanism 2; when the operating mechanism 2 is operated to close the load break switch, the first locking mechanism 3 moves and is in locking fit with the cover body 11 to prevent the cover body 11 from being opened, and when the operating mechanism 2 is pushed to open the load break switch, the operating mechanism 2 drives the first locking mechanism 3 to move and remove the locking fit with the cover body 11.

Preferably, the directions of movement of the first locking mechanism 3 and of the movable contact system are parallel to each other.

Preferably, the operating mechanism 2 comprises a power handle 20 in driving cooperation with the first locking mechanism 3; when the power handle 20 is pulled to switch on the load break switch, the first locking mechanism 3 moves to be matched with the cover body 11 in a locking way; when the power handle 20 is pulled to open the load break switch, the power handle 20 drives the first locking mechanism 3 to move and release the locking fit with the cover 11.

Preferably, the first locking mechanism 3 comprises a first locking mechanism main body 30 and at least one first locking hook 31 arranged on the first locking mechanism main body 30, and the first locking mechanism main body 30 is in driving fit with the power handle 20 and in limit fit with the housing main body 20; the cover body 11 comprises at least one first locking buckle 11-10;

when the power handle 20 is pulled to switch on the load break switch, the power handle 20 drives the first locking mechanism main body 30 to drive the first locking hook 31 to move towards the first locking buckle 11-10, so that the first locking hook 31 is in locking fit with the first locking buckle 11-10; when the power handle 20 is pulled to open the load break switch, the first locking mechanism body 30 is reset and drives the first locking hook 31 to be far away from the first locking buckle 11-10, so that the first locking hook 31 is unlocked and matched with the first locking buckle 11-10.

Preferably, the first locking catch 11-10 comprises a first locking groove, and the first locking catch 31 is in locking fit with the first locking groove.

Preferably, the housing main body 12 includes a first track groove, and the first locking mechanism main body 30 is slidably disposed in the first track groove; the housing main body 12 includes a first side wall 12-0 and a second side wall 12-1 which are oppositely arranged, and the first track groove is located between the first side wall 12-0 and the second side wall 12-1, and the extending direction of the first track groove is parallel to the moving direction of the movable contact system.

Preferably, the first locking mechanism 3 further comprises a first return spring 3a, and when the power handle 20 of the operating mechanism 2 is pulled to close the load break switch, the first return spring 3a drives the first locking mechanism 3 to move and return and is in locking fit with the cover 11.

Preferably, the power handle 20 and the first return spring 3a are respectively provided at both ends of the first locking mechanism body 30.

Preferably, the cover body 11 comprises a cover body 11-0 and at least one transparent surface cover 11-1 arranged on the cover body 11-0, the transparent surface cover 11-1 is in snap fit with the cover body 11-0, and the surface cover 11-0 comprises a first locking buckle 11-10.

Preferably, one end of the cover body 11 is hinged with the housing main body 12, and the other end of the cover body is in limit fit with the housing main body 12; after the first locking mechanism 3 and the cover 11 are disengaged from each other, the cover 11 can be rotated and opened relative to the housing body 12.

Preferably, the cover body 11-0 includes a cover mounting hole 11-01 provided thereon for mounting the transparent cover 11-1; the transparent face cover 11-1 comprises a face cover main body 11-11 and a face cover clamping hook 11-12 arranged at one end of the face cover main body 11-11, one end of the face cover main body 11-11 is in limit fit with one end of the face cover mounting hole 11-01, and the face cover clamping hook 11-12 at the other end of the face cover main body 11-11 is in clamping fit with the other end of the face cover mounting hole 11-01.

Preferably, the load break switch further comprises a fuse 1a, the transparent surface cover 11-1 and the fuse 1a are arranged in one-to-one correspondence, and the transparent surface cover 11-1 further comprises two voltage detecting holes 11-14 arranged at intervals and respectively matched with two fuse voltage detecting ends of the fuse 1a correspondingly.

According to the load break switch, the first locking mechanism avoids the situation that the cover body is opened under the switching-on state of the load break switch, so that the electric shock accident caused by the fact that the cover body is opened under the unexpected situation (personnel without operation authority open the cover body or users open the cover body by mistake) is avoided, the power utilization safety of users is ensured, and the working stability and reliability of the load break switch are also ensured.

Drawings

FIG. 1 is a schematic structural view of a switch housing of the present invention;

fig. 2 is a schematic structural diagram of a first locking mechanism of the present invention, in which the load break switch is in a closed state and the cover is locked;

fig. 3 is a schematic structural diagram of the first locking mechanism of the present invention, in which the load break switch is in the open state and the cover is unlocked;

FIG. 4 is an enlarged schematic view of portion A of FIG. 2 according to the present invention;

FIG. 5 is a schematic diagram of a loadbreak switch of the present invention showing at least the first side wall, the second side wall, and the positional relationship of the fuses;

FIG. 6 is an enlarged schematic view of portion B of FIG. 5 in accordance with the present invention;

FIG. 7 is an enlarged schematic view of portion C of FIG. 5 in accordance with the present invention;

fig. 8 is a schematic diagram of the loadbreak switch of the present invention, showing at least the components and assembly of one phase circuit;

fig. 9 is a schematic view of the loadbreak switch of the present invention showing at least a second locking mechanism;

FIG. 10 is an enlarged schematic view of portion D of FIG. 9 in accordance with the present invention;

fig. 11 is a schematic view of the loadbreak switch of the present invention showing at least the position of the screw lead-in structure in relation to the contact support;

FIG. 12 is an enlarged schematic view of section E of FIG. 11 in accordance with the present invention;

fig. 13 is a schematic structural view of the movable contact system of the present invention;

FIG. 14 is an enlarged schematic view of portion F of FIG. 13 in accordance with the present invention;

figure 15 is a schematic structural view of a contact support of the present invention;

FIG. 16 is an enlarged schematic view of portion G of FIG. 15 in accordance with the present invention;

fig. 17 is a schematic structural view of the movable contact system of the present invention, at least showing the assembled relationship of the movable contact assembly and the contact support;

fig. 18 is a schematic structural view of a movable contact assembly of the present invention;

FIG. 19 is a schematic view of a mating configuration of the contact system and arc extinguishing system of the present invention;

fig. 20a is a schematic perspective view of the mating of the contact system and arc extinguishing system of the present invention;

figure 20b is a schematic view of the structure of the arc chute of the present invention;

FIG. 20c is an enlarged schematic view of portion K of FIG. 20b in accordance with the present invention;

FIG. 21 is a schematic diagram of the structure of a three phase circuit of the present invention;

fig. 21a is a schematic diagram of the three phase circuit of the present invention, with the contact support omitted from fig. 21.

FIG. 22 is a schematic side view of the arrangement of three output ends according to the present invention;

FIG. 23 is a schematic front projection of the arrangement of three output terminals according to the present invention;

FIG. 24 is a schematic view of the load break switch of the present invention showing at least the assembled position of the fuse;

FIG. 25 is an enlarged schematic view of portion H of FIG. 24 in accordance with the present invention;

FIG. 26 is a schematic structural view of the switch mounting structure of the present invention, showing at least the assembly of the first snap with the first snap mounting structure;

FIG. 27 is an enlarged schematic view of portion I of FIG. 26 in accordance with the present invention;

FIG. 28 is a structural schematic view of the switch mounting structure of the present invention showing at least the first snap in disassembled configuration with the first snap mounting structure;

FIG. 29 is an enlarged schematic view of portion J of FIG. 28 in accordance with the present invention;

fig. 30 is a schematic view of a switch mounting structure according to an embodiment of the present invention, showing a structure of fitting with a switch fixing plate.

Fig. 31 is another embodiment of the switch mounting structure of the present invention, showing a schematic view of the fitting structure thereof with the switch fixing plate.

Detailed Description

Embodiments of the loadbreak switch of the present invention are further described below with reference to the examples shown in fig. 1-31. The load break switch of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1 and 8, the load circuit switch of the present invention includes a switch housing 1, and an operating mechanism 2 and at least one phase circuit respectively disposed in the switch housing 1, wherein the operating mechanism 2 includes a power handle 20, the phase circuit includes a fuse 1a, a contact system and an arc extinguish chamber 7, the contact system is connected in series with the fuse 1a, the arc extinguish chamber 7 is used in cooperation with the contact system, the contact system includes a moving contact system and a stationary contact 8, the power handle 20 is toggled to drive the moving contact system to move back and forth, and the moving contact system and the stationary contact 8 are closed/opened.

The main improvement points of the load circuit switch of the invention are as follows:

preferably, as shown in fig. 21 and 21a, each of the phase circuits includes at least two groups of contact systems and a fuse 1a connected in series between two adjacent groups of contact systems, each group of contact systems includes two fixed contacts 8 arranged at intervals and two movable contact assemblies 6 arranged side by side between the two fixed contacts 8 at intervals, two ends of the two movable contact assemblies 6 are respectively matched with the two fixed contacts 8, each fixed contact 8 includes a fixed contact plate 82 respectively matched with one end of each of the two movable contact assemblies 6, one end of each of the two movable contact assemblies 6 is respectively matched with the two fixed contact plates 82 of one fixed contact, and the other end of each of the two movable contact assemblies 6 is respectively matched with the two fixed contact plates 82 of the other fixed contact. In each phase circuit, two contact systems are used for forming 8 breakpoints (namely, each contact system forms four breakpoints), so that the current-carrying and voltage values at each breakpoint are obviously reduced, and the load break switch can be suitable for breaking higher current and voltage.

It should be pointed out that more groups (> 2 groups) of contact systems can be arranged in each phase circuit, so that the load break switch is suitable for breaking higher current and voltage; in the technical scheme of the load circuit breaker switch, each phase circuit is preferably provided with 2 groups of contact systems.

Preferably, as shown in fig. 9 and 10, fig. 11, fig. 12 and fig. 13, the load break switch of the present invention includes a first guiding and limiting structure, by which the contact support 5 is engaged with the switch housing 1, and the first guiding and limiting structure includes a rolling device and a rolling rail which are engaged. It should be noted that the contact support 5 is provided with a rolling device, and the switch housing 1 is provided with a rolling track; alternatively, the switch housing 1 is provided with a rolling device and the contact support 5 is provided with a rolling track. Further, as shown in fig. 9 and 10, fig. 11, fig. 12, and fig. 13, the movable contact system includes a contact support 5 and a movable contact assembly 6 disposed on the contact support 5; the contact support 5 comprises a contact support body 50 and a rolling means arranged on the contact support body 50 and cooperating with the switch housing 1. The rolling device of the load break switch can obviously reduce the friction force applied to the moving contact system in the moving process, so that the moving contact system can move more smoothly, and the rotational inertia can accelerate the opening and closing efficiency of the load break switch. Further, as shown in fig. 10, the rolling device includes a rolling bearing 51, and the contact support main body 50 includes a bearing mounting shaft 501 for mounting the rolling bearing 51; the switch housing 1 further comprises a rolling track cooperating with a rolling bearing 51. Further, the switch housing 1 includes a housing main body 12, the housing main body 12 includes two housing side walls disposed oppositely, i.e., a first side wall 12-0 and a second side wall 12-1 (see fig. 6), the contact support 5 is located between the first side wall 12-0 and the second side wall 12-1, and each housing side wall includes a rolling track cooperating with the rolling bearing 51; the contact support 5 comprises at least two rolling means, which are arranged on two sides of the contact support 5 opposite to the two housing side walls, respectively.

The first guiding and limiting structure of the load break switch is preferably matched with the rolling device and the rolling rail, and compared with the matched sliding rail and the matched sliding rail, the first guiding and limiting structure of the load break switch has smaller friction force, and the moving contact system can move more smoothly, so that the moving performance of the load break switch can be obviously improved.

It should be noted that the rolling device is not limited to be installed on two sides of the contact support 5 respectively opposite to the two housing side walls, but may be installed on the other two sides of the contact support 5 (as shown in fig. 9 and 10, the upper side and the lower side of the contact support 5), as long as the rolling device can be reliably matched with the switch housing 1; the load break switch of the invention preferably uses the above-mentioned mode to arrange the rolling device, and has simple structure, simple and convenient assembly and reliable work.

Preferably, as shown in fig. 1, the switch housing includes a cover 11 and a housing main body 12, the cover 11 is disposed on one side of the housing main body 12 and is in limit fit with the housing main body; as shown in fig. 2 and 3, the load break switch of the present invention further comprises a first locking mechanism 3 in driving engagement with the operating mechanism 2; when the operating mechanism 2 is operated to switch on the load break switch, the first locking mechanism 3 moves and is in locking fit with the cover body 11 to prevent the cover body 11 from being opened; when the operating mechanism 2 is operated to open the load break switch, the power handle 20 drives the first locking mechanism 3 to move and release the locking engagement with the cover 11. According to the load break switch, the first locking mechanism 3 avoids the situation that the cover body 11 is opened under the switching-on state of the load break switch, so that the electric shock accident caused by the fact that the cover body 11 is opened under the unexpected situation (a person without operation authority opens the cover body 11 or a user mistakenly operates to open the cover body 11 and the like) is avoided, the power utilization safety of the user is ensured, and the working stability and reliability of the load break switch are also ensured. Further, as shown in fig. 2 and 3, the operating mechanism 2 includes a power handle 20 in driving engagement with the first locking mechanism 3; when the power handle 20 is pulled to switch on the load break switch, the first locking mechanism 3 moves to be locked and matched with the cover body 11, and the cover body 11 is prevented from being opened; when the power handle 20 is pulled to open the load break switch, the power handle 20 drives the first locking mechanism 3 to move and release the locking fit with the cover 11. Further, as shown in fig. 2 and 3, the first locking mechanism 3 includes a first locking mechanism main body 30 and at least one first locking catch 31 disposed on the first locking mechanism main body 30, the first locking mechanism main body 30 is in driving fit with the power handle 20 and in limit fit with the housing main body 12; the cover body 11 comprises at least one first locking buckle 11-10; when the power handle 20 is pulled to switch on the load break switch, the power handle 20 drives the first locking mechanism 30 to drive the first locking hook 31 to move towards the first locking buckle 11-10, so that the first locking hook 31 is in locking fit with the first locking buckle 11-10; when the power handle 20 is pulled to open the load break switch, the first locking mechanism 30 is reset and drives the first locking hook 31 to be far away from the first locking buckle 11-10, so that the first locking hook 31 is unlocked and matched with the first locking buckle 11-10.

Preferably, as shown in fig. 2 and 3, the first locking mechanism 3 and the movable contact system move in parallel with each other.

Preferably, as shown in fig. 7, the first locking mechanism 3 further includes a first return spring 3a, and when the power handle 20 is toggled to close the load break switch, the first return spring 3a drives the first locking mechanism 3 to move and return and lock with the cover 11. According to the load break switch, the power handle 20 is not required to be connected with the first locking mechanism 3, when the power handle 20 is only required to be pulled to enable the load break switch to be switched off, the power handle 20 extrudes the first locking mechanism 3 to enable the first locking mechanism 3 to be unlocked with the cover body 11, and when the power handle 20 is pulled to enable the load break switch to be switched on, the power handle 20 releases the first locking mechanism 3, the first reset spring 3a enables the first locking mechanism 3 to be reset to enable the first locking mechanism 3 to be locked and matched with the cover body 11, the working reliability and stability of the first locking mechanism 3 are guaranteed, and the first locking mechanism 3 cannot be damaged due to improper operation of the power handle 20. It should be noted that the first locking mechanism 3 may also be directly connected to the power handle 20 without providing the first return spring 3a, and certainly, the structures of the first locking mechanism 3 and the power handle 20 need to be adaptively adjusted, and the power handle 20 swings to drive the first locking mechanism 3 to reciprocate to lock or unlock the cover 11, which also belongs to the protection scope of the load break switch of the present invention.

Preferably, as shown in fig. 8-12, the load break switch of the present invention further includes a second locking mechanism 4 in driving engagement with the cover 11, when the cover 11 is opened, the second locking mechanism 4 acts in limit engagement with the movable contact system or the operating mechanism 2 to prevent the load break switch from being closed, and when the cover 11 is closed, the cover 11 drives the second locking mechanism 4 to release the limit engagement with the movable contact system or the operating mechanism 2. According to the load break switch, the second locking mechanism 4 is in limit fit with the operating mechanism or the moving contact system, so that the load break switch is prevented from being switched on, switching on under the condition that the cover body 11 is opened (for example, a user overhauls the load break switch or replaces parts) can be avoided, and the power utilization safety of the user is ensured. It should be noted that, in the load break switch of the present invention, the operating mechanism 2 drives the moving contact system to move to close/open, so that as long as the cover 11 is opened, the second locking mechanism 4, whether cooperating with the operating mechanism or the moving contact system, can prevent the moving contact system from moving, so that the load break switch cannot be closed. Further, as shown in fig. 8 to 12, when the cover 11 is opened, the second locking mechanism 4 moves to be in limit fit with the contact support 5, so as to prevent the moving contact system from moving, and the load break switch cannot be switched on; when the cover 11 is closed, the cover 11 drives the second locking mechanism 4 to move to release the limit fit with the contact support 5. Further, as shown in fig. 9 and 12, the second locking mechanism 4 includes a second locking mechanism main body 40 and a second locking boss 41 provided on one side of the second locking mechanism main body 40, the second locking mechanism main body 40 is slidably fitted to the case main body 12 of the switch case 1; the contact holder 5 includes a contact holder locking groove 52 provided at one side thereof; when the cover 11 is opened, the second locking mechanism body 40 acts to drive the second locking boss 41 to enter the contact supporting locking groove 52 to be in limit fit with the contact supporting locking groove, so as to prevent the moving contact system from moving; when the cover 11 is closed, the cover 11 drives the second locking mechanism body 40 to move and drives the second locking boss 41 to move out of the contact support locking slot 52, so that the second locking mechanism 4 is released from the limit fit with the contact support 5.

Preferably, as shown in fig. 9, the second locking mechanism 4 and the movable contact system move in a direction perpendicular to each other.

Preferably, as shown in fig. 8 and 10, the second locking mechanism 4 further includes a second locking spring 4a, when the cover 11 is opened, the second locking spring 4a drives the second locking mechanism main body 40 to move and drives the second locking boss 41 to enter the contact supporting locking groove 52 to be in limit fit therewith, so as to prevent the moving contact system from moving and prevent the load break switch from being closed.

Preferably, as shown in fig. 13-18, the present invention is an improved movable contact system of a load break switch, specifically: the moving contact assembly 6 comprises two moving contacts 61 and a contact assembly shaft 60 which are oppositely arranged at intervals, and the contact assembly shaft 60 is arranged in the middle of the moving contact assembly 6 and penetrates through the two moving contacts 61; the contact support 5 comprises a contact assembly hole 502, a contact assembly beam 5020 is arranged in the middle of the contact assembly hole 502, and a contact assembly shaft slot 5021 is arranged in the middle of the contact assembly beam 5020; the moving contact assembly 6 is inserted into the contact assembly groove 502, two ends of the moving contact assembly 6 protrude out of two sides of the contact support 5, the contact assembly shaft 60 is arranged in the contact assembly shaft groove 5021, and the two moving contacts 61 are respectively positioned on two sides of the contact assembly beam 5020 and are in limit fit with the contact assembly beam 5020. Further, as shown in fig. 13 to 18, the movable contact assembly 6 further includes two movable contact spring strips 62 disposed at an interval, the two movable contact spring strips 62 are disposed on two sides of the two movable contacts 61 respectively, two ends of each movable contact spring strip 62 are pressed against two ends of one movable contact 61 respectively, and the movable contact assembly shaft 62 further penetrates through the two movable contact spring strips 62.

Preferably, as shown in fig. 18, the movable contact 61 includes a movable contact groove 611 disposed at a middle portion thereof, the two movable contact grooves 611 of the two movable contacts 6 of the movable contact assembly 6 are respectively protruded in opposite directions, a distance between bottom surfaces of the two movable contact grooves 611 matches with a thickness of the contact mounting beam 5020, and a distance between end portions of the two movable contacts 61 is smaller than the thickness of the movable contact mounting beam 5020.

Preferably, as shown in fig. 16 and 18, in the movable contact assembly 6, at least one movable contact 61 is provided with a movable contact limiting groove 610, and the contact mounting beam 5020 is provided with a contact limiting protrusion 5022; the contact assembly shaft 60 is in spacing fit with the contact assembly beam 5020 to prevent the moving contact assembly 6 from coming off from one end of the contact assembly hole 502, and the contact spacing protrusion 5022 is in spacing fit with the contact spacing groove 610 to prevent the moving contact assembly 6 from coming off from the other end of the contact assembly hole 502.

The moving contact system of the load break switch comprises a contact support 5 and a moving contact component 6, the moving contact component 6 is stably assembled in structure, the moving contact spring piece 62 ensures the contact reliability of the moving contact 61 and the static contact 8, the moving contact component 6 and the contact support 5 are reliably and stably assembled, the moving contact component 6 is ensured to synchronously act along with the contact support 5, and the action performance of the moving contact system is ensured.

Preferably, as shown in fig. 13 and 14, the contact support 5 includes a plurality of sets of moving contact assembly holes 502, each set of moving contact assembly holes 502 includes two moving contact assembly holes 502 arranged side by side in the transverse direction of the contact support 5, and the plurality of sets of moving contact assembly holes 502 are sequentially arranged at intervals in the axial direction of the contact support 5. Further, as shown in fig. 14, the contact support 5 further includes a moving contact enclosure 503 having an E-shaped structure, the moving contact enclosure 503 is disposed at the outer sides of the two ends of each group of contact assembly holes 502, two side-by-side enclosure spaces included in the moving contact enclosure 503 are respectively matched with the two contact assembly holes 502 in the same group, and the open end of the E-shaped structure of each moving contact enclosure 503 faces the static contact 8 matched with the moving contact assembly 6. The moving contact enclosure 503 of the load break switch of the invention is beneficial to increasing the insulation gap and creepage distance between two moving contact assemblies 6 in the same group and between two adjacent moving contact assemblies 6, and can also play a role in blocking electric arc, thereby greatly improving the live-line operation performance, the connection breaking performance and the short circuit breaking capacity of the load break switch.

Preferably, as shown in fig. 10, 20b and 20c, the arc chute 7 of the load break switch of the present invention is modified, specifically: the arc extinguish chamber 7 comprises two arc extinguish chamber side walls 70 which are oppositely arranged at intervals and an arc extinguish grid sheet group arranged between the two arc extinguish chamber side walls 70, wherein the arc extinguish grid sheet group comprises a plurality of arc extinguish grid sheets 72 arranged between the two arc extinguish chamber side walls 70; the arc extinguish chamber 7 further comprises a plurality of groups of grid plate assembling grooves 700, each group of grid plate assembling grooves 700 comprises two grid plate assembling grooves 700 respectively arranged on the side walls 70 of the two arc extinguish chambers, and the insertion end of at least one grid plate assembling groove 700 in each group of grid plate assembling grooves 700 is provided with a grid plate clamping table 701; the arc extinguishing grid piece 72 comprises two arc guiding semicircular grooves 702 which are arranged at the end of the arc extinguishing chamber inlet side by side at intervals, and the two arc guiding semicircular grooves 702 are used for respectively corresponding to the two movable contact assemblies 6. According to the arc extinguishing chamber 7, the arc extinguishing grid piece 72 comprises the two arc guiding semicircular grooves 702 which are arranged side by side at intervals, so that the arc extinguishing chamber 7 can be matched with the two moving contact assemblies 6 at the same time, and the arc striking efficiency and the arc extinguishing effect of the arc extinguishing chamber 7 are improved. In addition, the grid clamping table 701 simplifies the assembly mode of the arc extinguishing grid 72, so that the arc extinguishing chamber 7 is simpler in structure and simpler and more convenient to assemble. Further, the grid assembling grooves 700 are obliquely arranged, and the entrance of the grid assembling grooves 700 is further provided with a guide slope facilitating the insertion of the arc extinguishing grid 72, so that the arc extinguishing grid 700 is more easily inserted into the grid assembling grooves 700, and the assembling efficiency of the arc extinguishing chamber 7 is improved.

Preferably, as shown in fig. 26 to 31, the switch housing 1 further includes a switch mounting structure, the switch mounting structure includes a first latch 70a and a second latch 70-1a respectively disposed at two ends of the bottom of the switch housing 1, and the first latch 70a and the second latch 70-1a are respectively in limit fit with the switch fixing plate. Further, as shown in fig. 26 to 30, the second latch 70-1a is fixedly mounted on the switch housing 1, the first latch 70 is slidably disposed on the switch housing 1, and the first latch 70a is elastically connected to the switch housing 1 through a first latch return spring 71 a; when the load break switch is assembled, the first buckle reset spring 71a enables the first buckle 70a and the second buckle 70-1a to respectively tightly abut against two ends of the switch fixing plate and respectively and limitedly cooperate with the switch fixing plate. The switch mounting structure of the switch shell 1 of the load break switch has simple structure and simple and convenient operation, and realizes the quick and reliable mounting of the load break switch. Further, the first buckle 70a includes a first hook 702a, the second buckle 70-1a includes a second hook, and the first hook 702a and the first hook are disposed opposite to each other and hook two ends of the switch fixing plate, respectively.

Preferably, the first buckle 70a is far away from the switch fixing plate under the action of external force, and is released from the limit fit with the switch fixing plate.

Preferably, as shown in fig. 8-12, the load break switch of the present invention further comprises an input terminal block 4i and a screw introduction structure 2a, the switch housing 1 comprises a housing first side 1-0 and a housing second side 1-1 which are oppositely disposed, the input terminal block 4i is disposed on the housing first side 1-0; the screw leading-in structure 2a is correspondingly matched with the input wiring board 4i in a one-to-one mode, and two ends of the screw leading-in structure 2a are respectively close to the first side 1-0 of the shell and the second side 1-1 of the shell; when the load break switch is connected, a user transmits a busbar connecting screw 21a to the first side 1-0 of the shell from the second side 1-1 of the shell through the screw leading-in structure 2a, and fixedly connects the input wiring board 4i with the power inlet busbar. According to the load break switch, when wiring is conducted, the second side 1-1 of the shell faces a user, the first side 1-0 of the shell is opposite to the power inlet busbar, the space where the input wiring busbar 4i and the power inlet busbar are located is narrow, operation of the user is not facilitated or the user cannot operate the input wiring busbar, the screw leading-in structure 2a is convenient to convey the busbar connecting screw 21a to the first side 1-0 of the shell to fixedly connect the input wiring busbar 4i and the power inlet busbar, and wiring operation of the user is greatly facilitated.

Preferably, as shown in fig. 10 and 12, the screw lead-in structure 2a is a cylindrical structure, and includes a lead-in structure body 20a and two ring-shaped clamping grooves 200a respectively disposed at two ends of the lead-in structure body 20a, and the screw lead-in structure 2a is in limit fit with the switch housing 1 through the two ring-shaped clamping grooves 200 a. Further, as shown in fig. 10 and 12, the first side wall 12-0 and the second side wall 12-1 of the switch housing 1 are both provided with a half support plate 14, each half support plate 14 is provided with a semi-circular guide-in structure limiting groove, two ends of the screw guide-in structure 2a are both limited by the two half support plates 14, and each ring-shaped slot 200a is in limit fit with the side walls of the two semi-circular guide-in structure limiting grooves. The screw lead-in structure 2a is simple in fixing structure, the screw lead-in structure 2a can be reliably limited, wiring of the load break switch is facilitated, and meanwhile the situation that the screw lead-in structure 2a is separated from limitation to influence the internal action of the load break switch is avoided.

Preferably, as shown in fig. 8 and 21, each of the phase circuits further includes two fuse wire holders 9 and a first insulating barrier, the two fuse terminals of the fuse 1a are connected to the two fuse wire holders 9, respectively, and the first insulating barrier is provided between the fuse 1a and the fuse wire holders 9. The first insulating partition plate prevents the situation that local temperature rise is too high and the fuse 1a is damaged due to eddy current generated by too close distance between the fuse wire holder and the fuse and even conduction, and ensures the insulation property and the reliable insulation distance inside the load break switch. Further, as shown in fig. 6, the first insulating partition includes two first semi-insulating partitions 15 that are relatively matched, the two first semi-insulating partitions 15 are respectively disposed on a pair of shell side walls of the switch shell 1, a connection point of the two first semi-insulating partitions 15 is provided with a terminal avoiding groove through which a terminal of the co-melting fuse passes, the terminal of the fuse abuts against the bottom surface of the terminal avoiding groove, when a user installs the fuse 1a, the user inserts the terminal of the fuse 1a to avoid the bottom surface of the contact terminal avoiding groove in the groove, and it is described that the fuse 1a is installed in place, and an indication is provided for installation of the fuse 1 a. Further, as shown in fig. 25, the switch case 1 further includes a fuse support plate for supporting the fuse 1a, the fuse support plate including half support plates 14 respectively provided on a pair of side walls of the switch case 1. Further, as shown in fig. 25, two ends of each half support plate 14 are respectively connected with two first half insulating partition plates 15 in a bending manner, and the whole half support plate is in a zigzag structure.

Preferably, as shown in fig. 21-24, the load break switch of the present invention further includes three output terminals, namely a first phase output terminal 6-1a, a second phase output terminal 6-2a and a third phase output terminal 6-3a, all of which are disposed at one end of the switch housing 1, wherein the first phase output terminal 6-1a, the second phase output terminal 6-2a and the third phase output terminal 6-3a are sequentially stacked side by side at intervals along the height direction of the switch housing 1; a first insulating plate 18-1 is arranged between the first phase output end 6-1a and the second phase output end 6-2a, and a second insulating plate 18-2 is arranged between the second phase output end 6-2a and the third phase output end 6-3 a. According to the load break switch, the three output ends are arranged in a linear and interval stacking mode, so that each output end can occupy a larger installation space in the thickness direction of the switch shell 1, the specification of the output ends can be increased, the current carrying capacity is increased, and the wiring operation is more convenient; and an insulating plate is arranged between the adjacent output ends, so that the interphase insulating property of the load break switch is improved. Further, as shown in fig. 22 and 24, the third phase output terminal 6-3a, the second phase output terminal 6-2a and the first phase output terminal 6-1a are sequentially shifted away from the switch case 1. As shown in fig. 22 and 24, the first phase output end 6-1a, the second phase output end 6-2a and the third phase output end 6-3a are sequentially arranged from bottom to top, and the whole structure is a three-stage step structure. The three output ends are arranged according to the mode, so that the distance between the output ends is favorably further increased, and the sufficient insulation gap and creepage distance are ensured.

As shown in fig. 1-30, one embodiment of the loadbreak switch of the present invention is shown.

As shown in fig. 1, 8 and 21, the load break switch of the present invention, preferably a three-phase load break switch, includes a switch housing 1, an operating mechanism 2 disposed in the switch housing 1, and three phase circuits, which are sequentially disposed in the switch housing 1 side by side along an axial direction, i.e., a length direction of the switch housing 1; as shown in fig. 8, each phase circuit includes a fuse 1a, a contact system and an arc extinguishing system, the contact system is connected in series with the fuse 1a, the contact system is in one-to-one fit with the arc extinguishing system, the contact system includes a moving contact system and a static contact 8, the contact system is used in a fit manner, the operating mechanism 2 is in a drive fit with the moving contact system, the operating mechanism 2 includes a power handle 20, the power handle 20 is toggled to drive the moving contact system to move back and forth, the moving contact system and the static contact 8 are closed/opened, and closing/opening of the load break switch is.

Preferably, as shown in fig. 8 and 21, each of the phase circuits includes a fuse 1a, two fuse wire holders 9, two sets of contact systems and an arc extinguishing system, the two fuse wire terminals of the fuse 1a are respectively connected in series with the two sets of contact systems through the two fuse wire holders 9, and the contact systems and the arc extinguishing system are matched in a one-to-one manner. Further, as shown in fig. 20a and 21, each group of the contact systems includes a moving contact system and two static contacts 8, each group of the moving contact system includes a contact support 5 and two moving contact assemblies 6 installed on the contact support 5 and arranged side by side, and the two static contacts 8 are respectively installed at two ends of the two moving contact assemblies 6 and respectively matched with two ends of the two moving contact assemblies 6; every group arc extinguishing system is including two explosion chambers 7 that set up relatively, and two explosion chambers 7 set up respectively in the both ends outside of two moving contact subassembly 6, and the length of explosion chamber 7 on load circuit breaker switch length direction satisfies no matter be in the disconnection or the moving contact subassembly under the closed condition is all by the state that the explosion chamber is parcel from top to bottom, makes electric arc extinguish inside load circuit breaker through explosion chamber 7 completely, realizes the zero flashover of product surface, improves product factor of safety.

Preferably, the contact support 5 of each phase circuit is a linked split structure, or each phase circuit shares the contact support 5 of an integrated structure. Further, as shown in fig. 8 and 21, the respective phase circuits of the load break switch of the present invention preferably share a contact support 5 of an integrated structure.

Each phase circuit of the load break switch comprises two groups of contact systems, each group of contact systems comprises a moving contact system and two fixed contacts 8, each group of moving contact system comprises two moving contact assemblies 6, each phase circuit is provided with four groups of breaking point groups which are sequentially connected in series, and each group of breaking point group also comprises two groups of breaking points which are connected in parallel, so that the current born by each contact is reduced, the electric repulsion of the contacts is effectively reduced, and the current carrying capacity, the breaking capacity and the rated service voltage of the load break switch are greatly improved.

Specifically, as shown in the direction of fig. 21, the three phase circuits are sequentially arranged side by side from left to right; the operating mechanism 2 is arranged at one end of the left side of the switch shell 1, fuse wiring ends are arranged on the left side and the right side of each fuse 1a, and two fuse wiring seats 9 (a left wiring seat 9-1 on the left side and a right wiring seat 9-2 on the right side) on the two sides of each fuse 1a are matched; a group of contact systems and a group of arc extinguishing systems are arranged below each fuse wire holder 9, a left contact system and a left arc extinguishing system are arranged below a left wire holder 9-1, and a right contact system and a right arc extinguishing system are arranged below a right wire holder 9-2); the upper end and the lower end of the left side of each of the two moving contact assemblies 6 of each moving contact system are respectively provided with a static contact 8, and the two arc extinguish chambers 7 are respectively arranged on the upper part and the lower part of the two moving contact assemblies 6. Further, as shown in fig. 21a, taking the leftmost phase circuit as an example: the fuse 1a is respectively connected with a left contact system and a right contact system (respectively a left contact system and a right contact system) in series through a left wire holder 9-1 and a right wire holder 9-2; the left contact system comprises an upper left fixed contact 8-1 and a lower left fixed contact 8-2 which are arranged oppositely up and down, and a left inner movable contact component 6-1 and a left outer movable contact component 6-2 which are arranged side by side; the left upper static contact 8-2 is connected with the left wiring seat 9-1, and the left lower static contact 8-1 is connected with the input wiring board 4 i; the upper ends of the left inner moving contact component 6-1 and the left outer moving contact component 6-2 are respectively matched with the left upper static contact 8-2, the lower ends of the left inner moving contact component 6-1 and the left outer moving contact component 6-2 are respectively matched with the left lower static contact 8-1, and four breakpoints are formed by the conformal structure; the right contact system comprises a right upper static contact 8-3 and a right lower static contact 8-4 which are oppositely arranged up and down, and a right inner movable contact component 6-3 and a right outer movable contact component 6-4 which are arranged side by side; the right upper static contact 8-3 is connected with the right wiring seat 9-2, the right lower static contact 8-4 is connected with the output wiring board, the upper ends of the right inner moving contact assembly 6-3 and the right outer moving contact assembly 6-4 are respectively matched with the right upper static contact 8-3, the lower ends of the right inner moving contact assembly 6-3 and the right outer moving contact assembly 6-4 are respectively matched with the right lower static contact 8-4, and four breakpoints are formed by the matching; as can be seen, the leftmost phase circuit has two current paths in common, which are: the first current path is an input terminal plate 4i (first input terminal plate 4-1i) → left lower static contact 8-1 → left inner moving contact assembly 6-1 → left upper static contact 8-2 → left terminal plate 9-1 → fuse 1a → right terminal plate 9-2 → right upper static contact 8-3 → right inner moving contact assembly 6-3 → right lower static contact 8-4 → output terminal plate (first output terminal plate 5-1o), and the second current path is an input terminal plate 4i (first input terminal plate 4-1i) → left lower static contact 8-1 → left outer moving contact assembly 6-2 → left upper static contact 8-2 → left terminal plate 9-1 → fuse 1a → right terminal plate 9-2 → right upper static contact 8-3 → right outer moving contact assembly 6-4 → right lower static contact 8-4 → output terminal plate (first output terminal plate 5) -1 o); the two current paths are divided at the break point and merged at the fuse 1a, and because the currents of all paths are obviously reduced after the current paths are divided, the electric repulsion generated when the load break switch is opened is correspondingly reduced, the load break switch can meet the performance requirement of higher current, the temperature rise generated at each movable contact component 6 after the current paths are divided is reduced, the heat generation is reduced, and the smaller shell space can be adapted; moreover, four break points are formed on each current path, and because of series voltage division, the load voltage at each break point is only 1/4 of the total voltage value, so the load break switch can realize the breaking of higher voltage, in particular to the reliable breaking of voltage of 800V and above which can not be realized by the existing products.

Preferably, as shown in fig. 21, the fuse wire holder 9 is a U-shaped structure, and includes two wire holder clamping plates and a wire holder connecting plate which are arranged oppositely, and two ends of the wire holder connecting plate are respectively connected with the two wire holder clamping plates in a bending manner. Further, as shown in fig. 21, the free end of the wire holder clamping plate is divided into two half wire holder clamping plates which are arranged side by side at intervals; the phase circuit still includes the spring coil, and every spring coil both ends all set up in a pair of half wire holder splint both sides that set up relatively, guarantee the reliable contact of fuse wire holder 9 and the fuse wiring end of fuse 1 a.

Preferably, as shown in fig. 20a, the static contact 8 includes a static contact wiring board 80, a static contact connection board 81 and two static contact plates 82, one end of the static contact connection board 81 is connected to the static contact wiring board 80 in a bending manner, the other end of the static contact connection board is provided with two static contact plates 82 arranged side by side at intervals, and the two static contact plates 82 are respectively matched with one end of the two movable contact assemblies 6.

As shown in fig. 9-10 and 13-18, the load break switch of the present invention improves the moving contact system, specifically as follows:

preferably, as shown in fig. 9 and 10, the load break switch of the present invention comprises a first guide limit structure by which the contact support 5 is engaged with the switch housing 1; the first guiding and limiting structure comprises a rolling device and a rolling track which are matched with each other. Further, as shown in fig. 9 and 10, the contact holder 5 includes a contact holder body 50 and a rolling device provided on the contact holder body 50 and engaged with the switch housing 1; the switch housing 1 comprises a rolling track cooperating with rolling means. Further, as shown in fig. 10, the rolling device includes a rolling bearing 51, and the contact support main body 50 includes a bearing mounting shaft 501 for mounting the rolling bearing 51; the switch housing 1 further comprises a rolling track cooperating with a rolling bearing 51. Further, as shown in fig. 1 and 5, the switch housing 1 includes a housing main body 12, the housing main body 12 includes two housing side walls disposed oppositely, i.e., a first side wall 12-0 and a second side wall 12-1, respectively, the contact support 5 is located between the first side wall 12-0 and the second side wall 12-1, and each housing side wall includes a rolling track cooperating with a rolling bearing 51; the contact support 5 comprises at least two rolling means, which are arranged on two sides of the contact support 5, respectively opposite to the two housing side walls. Further, as shown in fig. 9, 11 and 13, the contact support 5 includes two sets of rolling devices respectively disposed at two ends thereof, each set of rolling devices includes two rolling devices disposed at an interval; the two rolling devices of each set of rolling devices are respectively arranged at two sides of the contact support 5 and are respectively matched with the first side wall 12-0 and the second side wall 12-1.

Specifically, as shown in fig. 9, 11 and 13, the contact support 5 includes a first contact support sidewall opposite to the first sidewall 12-0 and a second contact support sidewall opposite to the second sidewall 12-1, two rolling devices are respectively disposed at two ends of the first contact support sidewall, and two rolling devices are respectively disposed at two ends of the second contact support sidewall.

Preferably, as shown in fig. 9 and 10, the bearing mounting shaft 501 extends perpendicular to the housing sidewall.

Preferably, as shown in fig. 13 to 18, the movable contact assembly 6 includes two movable contacts 61 arranged at an interval, two movable contact spring strips 62 arranged at an interval, and a contact assembly shaft 60, the two movable contact spring strips 62 are respectively arranged at two sides of the two movable contacts 61, two ends of each movable contact spring strip 62 respectively press against two ends of one movable contact 61, and the contact assembly shaft 60 is arranged in the middle of the movable contact assembly 6 and respectively penetrates through the movable contacts 61 and the movable contact spring strips 62; the contact support 5 comprises a contact assembly hole 502, a contact assembly beam 5020 is arranged in the middle of the contact assembly hole 502, and a contact assembly shaft slot 5021 is arranged in the middle of the contact assembly beam 5020; the moving contact assembly 6 is inserted into the contact assembly hole 502, two ends of the moving contact assembly 6 protrude out of two sides of the contact support 5, the contact assembly shaft 60 is arranged in the contact assembly groove 5021, and the two moving contacts 61 are respectively positioned on two sides of the contact assembly beam 5020 and are in limit fit with the contact assembly beam 5020. Further, as shown in fig. 18, the movable contact assembly 6 further includes a movable contact positioning shaft sleeve 63, the movable contact positioning shaft sleeve 63 is sleeved on the contact assembly shaft 60, is located between the two movable contacts 61, and is respectively in limit fit with the two movable contacts 61; the moving contact positioning shaft sleeve 63 is arranged in the contact assembling shaft groove 5021.

Preferably, the contact mounting shaft 60 is a rivet, and rivets the two moving contacts 61, the two moving contact spring pieces 62 and the moving contact positioning shaft sleeve 63 together; as shown in fig. 18, the movable contact spring piece 62 has an arch structure.

Preferably, as shown in fig. 18, two movable contacts 613 are respectively disposed at two ends of each movable contact 61, the two movable contacts 613 disposed at the same end of each movable contact 61 are arranged side by side at intervals along the width direction of the movable contact 61, one end of each movable contact 61 loads two sides of the fixed contact plate 82 of the fixed contact 8, and two fixed contact plates 82 are respectively in contact with the two movable contacts 613, so that multi-point contact is realized, and the contact reliability between the movable contact assembly 6 and the fixed contact 8 is improved.

Preferably, as shown in fig. 18, two ends of the movable contact 61 are respectively provided with a movable contact fitting groove 612, which is in limit fit with two ends of the spring leaf 62, so that the movable contact 61 and the movable contact spring leaf 62 are reliably limited.

Preferably, as shown in fig. 17 to 18, the movable contact 61 includes a movable contact groove 611 disposed at a middle portion thereof, the two movable contact grooves 611 of the two movable contacts 61 of the movable contact assembly 6 are respectively protruded in opposite directions, a distance between bottom surfaces of the two movable contact grooves 611 matches with a thickness of the contact mounting beam 5020, and a distance between end portions of the two movable contacts 61 is smaller than the thickness of the contact mounting beam 5020. Further, as shown in fig. 14 and 16-17, two side edges of two ends of the contact mounting beam 5020 along the thickness direction thereof are provided with a chamfer structure, so that the cross section of the contact mounting beam 5020 is a shuttle-shaped structure, and when the movable contact assembly 6 is inserted into the contact mounting hole 502, the contact mounting beam 5020 can be conveniently squeezed between the two movable contacts 61. Further, as shown in fig. 17, the lengths of the parts of the movable contact assembly 6 respectively protruding from the two sides of the contact support 5 are the same; the two moving contact grooves 611 form a space with a cross section in a shuttle-shaped structure, and the shape of the space is matched with that of the contact assembly beam 5020.

Preferably, as shown in fig. 14 and 16-18, in the movable contact assembly 6, at least one movable contact 61 is provided with a movable contact limiting groove 610, and the contact assembly beam 5020 is provided with a contact limiting protrusion 5022; the contact assembly shaft 60 is in spacing fit with the contact assembly beam 5020 to prevent the moving contact assembly 6 from coming off from one end of the contact assembly hole 502, and the contact spacing protrusion 5022 is in spacing fit with the contact spacing groove 610 to prevent the moving contact assembly 6 from coming off from the other end of the contact assembly hole 502. Furthermore, two moving contacts 61 of the moving contact assembly 6 are both provided with a moving contact limiting groove 610, and two of the contact assembling beams 5020 are respectively provided with a contact limiting protrusion 5022 which is in limiting fit with the two moving contact limiting grooves 610. Specifically, as shown in fig. 18, the moving contact groove 611 of the moving contact 61 is a groove with an isosceles trapezoid-shaped cross section, and includes a groove bottom surface and two groove sidewalls, the two groove sidewalls are respectively connected to two ends of the groove bottom surface at an obtuse angle, one of the groove sidewalls is provided with a moving contact limiting groove 610, and the cross section of the moving contact limiting groove 610 is a wedge-shaped structure; as shown in fig. 16, two side edges of two ends of the contact mounting beam 5020 along the thickness direction of the contact mounting beam 5020 are provided with chamfer structures to form four chamfer inclined planes, two chamfer inclined planes at one end of the contact mounting beam 5020 are respectively provided with a contact limiting protrusion 5022, and the cross section of the contact limiting protrusion is in a wedge-shaped structure. Further, as shown in connection with fig. 13-16, the contact mounting shaft slot 5021 and the contact limit projection 5022 are located at two ends of the contact mounting beam 5020, respectively.

Preferably, as shown in fig. 13 to 16, the contact support 5 includes a plurality of sets of moving contact assembly holes 502, each set of moving contact assembly holes 502 includes two moving contact assembly holes 502 arranged side by side along the lateral direction of the contact support 5 at intervals, and the plurality of sets of moving contact assembly holes 502 are arranged at intervals along the axial direction of the contact support 5 in sequence. Specifically, as shown in fig. 13 and 15, the contact support 5 is provided with 3 sets of movable contact mounting holes 502. Further, as shown in fig. 13 to 16, the contact support 5 further includes moving contact enclosing parts 503 having an E-shaped structure, moving contact enclosing parts 503 are respectively disposed on outer sides of two ends of each group of the contact assembling holes 502, and an open end of the E-shaped structure of each moving contact enclosing part 503 faces the static contact 8 matched with the moving contact assembly 6. Specifically, as shown in fig. 14, the movable contact enclosure 503 of the E-shaped structure includes two enclosure spaces arranged side by side at intervals, and the enclosure spaces are respectively matched with two contact assembly holes 502 of the same group. The moving contact enclosure 503 with the E-shaped structure increases the insulation performance between two adjacent moving contact assemblies 6.

Preferably, as shown in fig. 10, one end of the contact support 5 is provided with two contact support connection grooves, and the two contact support connection grooves are symmetrically arranged on two sides of the contact support 5; the operating mechanism 2 further comprises an operating mechanism connecting rod 21, and the operating mechanism connecting rod 21 comprises two operating mechanism connecting plates which are oppositely arranged, are respectively inserted into the two contact support connecting grooves and are fixedly connected with the contact support 5 through first fixing pins 21-50. Specifically, the operating mechanism 2 is in driving connection with the contact support 5, and the operating mechanism 2 drives the whole moving contact system to move back and forth through the contact support 5, so that the load break switch is switched on/off.

As shown in fig. 19-20c, the load break switch of the present invention also improves the arc chute 7 as follows:

preferably, as shown in fig. 19 and 20b, the arc extinguishing chamber 7 includes two arc extinguishing chamber side walls 70 disposed at opposite intervals and an arc extinguishing grid sheet group disposed between the two arc extinguishing chamber side walls 70, and the arc extinguishing grid sheet group includes a plurality of arc extinguishing grid sheets 72 disposed between the two arc extinguishing chamber side walls 70; the arc chute 72 includes two arc guiding semi-circular slots 702 spaced side by side at one end of the arc chute at the inlet end of the arc chute. Further, as shown in fig. 20c, the arc extinguish chamber further includes a plurality of sets of grid plate assembling grooves 700, each set of grid plate assembling grooves 700 includes two grid plate assembling grooves 700 respectively disposed on two arc extinguish chamber sidewalls 70, and an insertion end of at least one grid plate assembling groove 700 in each set of grid plate assembling grooves 700 is provided with a grid plate clamping platform 701.

Preferably, the arc extinguishing grid 72 is located at one end of the arc extinguishing chamber inlet, a grid straight section is arranged between the two arc guiding semicircular grooves 702, and the end parts of the two sides of the two arc guiding semicircular grooves 702 are all parallel and level with the grid straight section.

Preferably, the inlet ends of two grid assembly grooves 700 of each set of grid assembly grooves 700 are both provided with a grid clamping table 701; and grid clamping grooves matched with the grid clamping tables 701 are formed in both sides of one end, located at the outlet of the arc extinguishing chamber, of the arc extinguishing grid 72.

Preferably, the grid assembly groove 700 is obliquely arranged, and a guide slope for facilitating the insertion of the arc extinguishing grid 72 is further provided at an entrance of the grid assembly groove 700.

Preferably, as shown in fig. 20b, the arc-extinguishing chamber further comprises a connecting plate 71, and two ends of the two arc-extinguishing chamber sidewalls 70 are connected by the two connecting plates 71 respectively. Further, as shown in fig. 20b, one end of one of the connection plates 71 at the inlet of the arc extinguishing chamber is provided with a connection plate hook 725 bent outward, and the connection plate hook 725 is located between the two arc guiding semicircular grooves 702. Further, as shown in fig. 20b, the connection plate 71 at the right end of the arc chute 7 is provided with a connection plate hook 725.

Specifically, as shown in fig. 20b, two arc extinguishing chamber sidewalls 70 are disposed at an interval from top to bottom, and the left and right ends of the two arc extinguishing chamber sidewalls 70 are connected by a connecting plate 71; the grid sheet assembly groove 700 extends from back to front and inclines towards left, and a grid sheet clamping table 701 and a guiding slope are arranged at the rear end (inlet end) of the grid sheet assembly groove 700; the rear end (the one end that is located the explosion chamber 7 export) of arc extinguishing bars piece 72 is equipped with the bars piece draw-in groove, and the front end (the one end that is located the explosion chamber 7 entry) is equipped with two arc semi-circular grooves 702 that lead that set up side by side at the interval, and the arc semi-circular groove 702 that leads of polylith arc extinguishing bars piece 72 constitutes two parallels of explosion chamber bars piece group and leads the arc semi-circular slot that sets up side by side.

Fig. 20a shows an embodiment of the arc extinguishing system and contact system in cooperation.

As shown in fig. 20a, two arc extinguishing chambers 7 are used as an arc extinguishing system in cooperation with a contact system, the two arc extinguishing chambers 7 are respectively disposed above and below two movable contact assemblies 6 disposed side by side, two arc-guiding semicircular grooves of each arc extinguishing chamber 7 are respectively matched with the two movable contact assemblies 6, two static contacts 8 are disposed opposite to each other and located on the same side of the two movable contact assemblies 6, and are respectively matched with the upper ends and the lower ends of the two movable contact assemblies 6, and each static contact 8 includes two static contact plates 82 disposed side by side and respectively matched with the two movable contact assemblies 6.

As shown in fig. 11 and 21-23, the load circuit breaker of the present invention further improves the arrangement of the output terminals, specifically as follows:

preferably, as shown in fig. 11, 22 and 23, the load break switch of the present invention comprises three output terminals, a first phase output terminal 6-1a, a second phase output terminal 6-2a and a third phase output terminal 6-3 a; the three output ends are all arranged at one end of the switch shell 1, and the first phase output end 6-1a, the second phase output end 6-2a and the third phase output end 6-3a are sequentially arranged side by side at intervals in a stacking manner along the height direction of the switch shell 1; a first insulating plate 18-1 is arranged between the first output end 6-1a and the second output end 6-2a, and a second insulating plate 18-2 is arranged between the second output end 6-2a and the third output end 6-3 a. Further, as shown in fig. 22, the third phase output terminal 6-3a, the second phase output terminal 6-2a and the first phase output terminal 6-1a are sequentially shifted along the length direction of the switch housing 1 to a direction away from the switch housing 1.

Preferably, as shown in fig. 11, the first insulating plate 18-1 and the second insulating plate 18-2 are disposed in parallel at intervals, and one ends of the first insulating plate and the second insulating plate are respectively connected to the switch housing 1 in a limiting manner.

Specifically, as shown in fig. 22, the first phase output end 6-1a, the second phase output end 6-2a and the third phase output end 6-3a are sequentially arranged from bottom to top, and the whole structure is a three-stage stepped structure. Further, as shown in fig. 22, the first phase output terminal 6-1a, the second phase output terminal 6-2a and the third phase output terminal 6-3a are sequentially shifted to the right side.

Preferably, as shown in fig. 21, in the load break switch of the present invention, the three phase circuits are sequentially distributed along the axial direction of the switch housing 1, and are respectively a first phase circuit, a second phase circuit and a third phase circuit; the first phase circuit comprises a first output wiring board 5-1o, the second phase circuit comprises a second output wiring board 5-2o, and the third phase circuit comprises a third output wiring board 5-3 o; one end of the first output wiring board 5-1o is connected with the first output end 6-1a, one end of the second output wiring board 5-2o is connected with the second phase output end 6-2a, and one end of the third output wiring board 5-3o is connected with the third phase output end 6-3 a. Further, as shown in fig. 21, the first output terminal block 5-1o and the second output terminal block 5-2o are disposed oppositely, and the third output terminal block 5-3o is located between the first output terminal block 5-1o and the second output terminal block 5-2 o.

Specifically, as shown in fig. 21, the first output wiring board 5-1o includes a first output wiring board main body, and a first output inner connection board and a first output outer connection board respectively disposed at two ends of the first output wiring board main body, the first output inner connection board and the first output outer connection board are respectively connected to the first output wiring board main body in a bending manner and are both located at the same side of the first output wiring board main body, and the first output outer connection board is connected to the first phase output end 6-1 a; the second output wiring board 5-2o comprises a second output wiring board main body, a second output inner connecting plate and a second output outer connecting plate, wherein the second output inner connecting plate and the second output outer connecting plate are respectively arranged at two ends of the second output wiring board main body, the second output inner connecting plate and the second output outer connecting plate are respectively connected with the second output wiring board main body in a bending mode and are positioned at the same side of the second output wiring board main body, and the second output outer connecting plate is connected with the second phase output end 6-2 a; the third output wiring board 5-3o comprises a third output wiring board main body, and a third output inner connecting plate and a third output outer connecting plate which are respectively arranged at two ends of the third output wiring board main body, wherein the third output inner connecting plate and the third output outer connecting plate are respectively connected with the third output wiring board main body in a bending way and are respectively positioned at two sides of the third output wiring board main body, and the third output outer connecting plate is connected with a third phase output end 6-3 a; the first output inner connecting plate, the first output outer connecting plate, the second output inner connecting plate, the second output outer connecting plate, the third output inner connecting plate and the third output outer connecting plate are all located between the first output wiring board main body and the second output wiring board main body, the first output wiring board main body and the second output wiring board main body are arranged in parallel at intervals, and the third output wiring board main body is located between the first output wiring board main body and the second output wiring board main body and is perpendicular to the first output wiring board main body and the second output wiring board main body. Further, as shown in fig. 21, the first output external connection plate, the second output external connection plate and the third output external connection plate are sequentially stacked side by side at intervals along the height direction of the switch housing 1; the first output outer connecting plate, the second output outer connecting plate and the third output outer connecting plate are sequentially arranged side by side at intervals along the axial direction of the switch shell 1.

Preferably, as shown in fig. 1, the switch housing 1 further includes a bottom cover 17, the cover 11, the housing main body 12 and the bottom cover 17 are sequentially disposed, and the cover 11 and the bottom cover 17 are respectively engaged with two ends of the housing main body 12 in the height direction. Further, as shown in fig. 1, 21 and 26, the first phase input terminal block 4-1i, the second phase input terminal block 4-2i and the third phase input terminal block 4-3i, and the first output terminal block 5-1o, the second output terminal block 5-2o and the third output terminal block 5-3o are disposed on the bottom cover 17; the three output ends and the operating mechanism 2 are respectively positioned at two ends of the switch shell 1.

As shown in fig. 26 to 31, the load break switch of the present invention further improves the switch mounting structure, as follows:

preferably, as shown in fig. 26, 28 and 30, the first embodiment of the switch mounting structure is as follows: the switch shell 1 comprises a switch mounting structure, and the switch mounting structure comprises a first buckle 70a, a first buckle return spring 71a and a second buckle 70-1a which are respectively arranged at two ends of the bottom of the switch shell 1; the first buckle 70a is arranged on the switch shell 1 in a sliding mode, and the first buckle 70a is elastically connected with the switch shell 1 through a first buckle return spring 71 a; when the load break switch is assembled, the first buckle reset spring 71a enables the first buckle 70a and the second buckle 70-1a to respectively tightly abut against two ends of the switch fixing plate and respectively and in limit fit with the switch fixing plate. Further, as shown in fig. 30, the first latch 70a is separated from the switch fixing plate by an external force, and is released from the limit engagement with the switch fixing plate. Specifically, as shown in fig. 30, the first latch 70a moves upward under the action of an external force, so that the first latch 70a is disengaged from the switch mounting plate.

Preferably, as shown in fig. 26, 28 and 30, the first latch 70a includes a first hook 702a, the second latch 70-1a includes a second hook, and the first hook 702a and the second hook are disposed oppositely and hook two ends of the switch fixing plate respectively. Further, as shown in fig. 30, the switch fixing plate includes a first fixing plate 8-1a and a second fixing plate 8-2a which are arranged in parallel and spaced apart, and are in limit fit with the first catch 70a and the second catch 70-1a, respectively.

Preferably, as shown in fig. 27 and 29, the first catch 70a and one embodiment of the first catch 70a are in a mating relationship with the switch housing 1.

As shown in fig. 27 and 29, the first buckle 70a includes a first buckle main body 701a, a first hook 702a and a first buckle spring limiting portion 703a, and the first hook 702a and the first buckle spring limiting portion 703a are respectively disposed at two sides of the first buckle main body 701 a; as shown in fig. 27 and 29, the switch housing 1a further includes a first snap-fit mounting structure, the first snap-fit mounting structure includes a first sliding slot 720a and a snap-fit spring assembly slot 721a, the snap-fit spring assembly slot 721a is disposed at one end of the bottom wall of the first sliding slot 720a, the first snap body 701a is slidably disposed in the first sliding slot 720a, the first snap spring limiting portion 703a is disposed in the snap-fit spring assembly slot 721a, the first snap return spring 71a is disposed in the snap-fit spring assembly slot 721a, and two ends of the first snap return spring are respectively in limit fit with the side wall of the snap-fit spring assembly slot 721a and the first snap spring limiting portion 703 a. Further, as shown in fig. 27 and 29, the first buckle main body 701a further includes a buckle return spring installation hole 7012a, a first buckle front avoidance groove 7010a and a first buckle rear avoidance groove 7011a, the buckle return spring installation hole 7012a is disposed in the middle of the first buckle main body 701a, the two first buckle front avoidance grooves 7010a are respectively disposed on two side edges of one end of the first buckle main body 701a, and the two first buckle rear avoidance grooves 7011a are respectively disposed on two side edges of the other end of the first buckle main body 701 a; as shown in fig. 27 and 29, a first snap-fit hole 7200a is formed in one side of the first sliding slot 720a, a first front snap-fit positioning boss 722a is respectively disposed on two sides of one end of the first snap-fit hole 7200a, and a first rear snap-fit positioning boss 723a is respectively disposed on two sides of the other end of the first snap-fit hole; when the first buckle 70a is installed in the first buckle installation structure, the first buckle main body 701a is located on one side of the first buckle installation hole 7200a, the two first buckle front avoidance grooves 7010a correspond to the two first buckle front positioning bosses 722a, the two first buckle rear avoidance grooves 7011a correspond to the two first buckle rear positioning bosses 723a, the first buckle spring limiting portion 703a corresponds to the buckle spring installation groove 721a, the first buckle 70a is placed in the first sliding groove 720a, then the first buckle 70a slides in the direction of the buckle spring installation groove 721a, and the first buckle return spring 71a is installed in the buckle spring installation groove 721a through the buckle return spring installation hole 7012 a.

Preferably, as shown in fig. 27, a snap spring mounting groove partition plate 7210a extending in the axial direction of the snap spring mounting groove 721a is provided in the middle of the snap spring mounting groove 721a, the length of the snap spring mounting groove partition plate 7210a is smaller than that of the snap spring mounting groove 721a, and two first snap return springs 71a are disposed side by side in the snap spring mounting groove 721a and on both sides of the snap spring mounting groove partition plate 7210a, respectively.

Preferably, as shown in fig. 29, the first buckle 70a further includes a first buckle unlocking portion 700a, and a first buckle spring limiting portion 703a are respectively located at two ends of the first buckle 70a, a first buckle unlocking operation hole 7000a is formed in the first buckle unlocking portion 700a, and the first buckle 70a is driven by external force to be away from the switch fixing plate through the first buckle unlocking operation hole 7000 a.

Preferably, as shown in fig. 26 and 28, the second catch 70-1a and one embodiment of the second catch 70-1a are in a mating relationship with the switch housing 1.

As shown in fig. 26 and 28, the second buckle 70-1a is fixedly disposed on the switch housing 1, and includes a second buckle main body and a second hook, the second hook is disposed on one side of the first buckle main body, and the second buckle main body is fixedly connected to the switch housing 1 through a mounting screw. Of course, the second latch 70-1a may also have the same structure as the first latch 70a, and also may function to mount the load break switch, but may make the structure of the switch mounting structure complicated.

Specifically, as shown in fig. 8 and 26, the switch mounting structure and the input wiring board 4i are both disposed on the first side 1-0 of the housing, the first latch 70a and the second latch 70-1a are respectively disposed at two ends of the first side 1-0 of the housing, and the three input wiring boards 4i are sequentially disposed between the first latch 70a and the second latch 70-1a side by side at intervals.

As shown in fig. 31, another embodiment of the switch mounting structure is as follows: the first buckle 70a comprises a first hook 702a, the second buckle 70-1a comprises a second hook, and the first hook 702a and the second hook face the same direction; the switch fixing plate comprises a first fixing plate 8-1a and a second fixing plate 8-2a which are arranged in parallel at intervals up and down, and a first clamping hook 702a and a second clamping hook are hung on the first fixing plate 8-1a and the second fixing plate 8-2a respectively. The switch mounting structure of the embodiment can realize quick hanging and dismounting of the load break switch.

As shown in fig. 1-7, an important innovative aspect of the loadbreak switch of the present invention is the inclusion of a first locking mechanism 3, specifically as follows:

as shown in fig. 1, the switch housing 1 includes a cover 11 and a housing main body 12, the cover 11 is disposed on one side of the housing main body 12 to be matched with the housing main body 12; the first locking mechanism 3 is in driving fit with the power handle 20 of the operating mechanism 2; as shown in fig. 2 and 3, when the power handle 20 is toggled to close the load break switch, the first locking mechanism 3 moves to be locked with the cover 11, so as to prevent the cover 11 from being opened, and when the power handle 20 is toggled to open the load break switch, the power handle 20 drives the first locking mechanism 3 to be unlocked with the cover 11.

Preferably, the first locking mechanism 3 and the moving direction of the movable contact system are parallel to each other.

Preferably, as shown in fig. 2 and 3, one end of the cover 11 is hinged to one end of the housing main body 12, the other end of the cover 11 is in limit fit with the other end of the housing main body 12, and when the cover 11 is opened, the cover 11 rotates relative to the housing main body 12. Specifically, as shown in fig. 2 and 3, the upper end of the cover 11 is hinged to the upper end of the housing main body 12.

Preferably, as shown in fig. 2 and 3, the first locking mechanism 3 comprises a first locking mechanism main body 30 and at least one first locking catch 31 arranged on the first locking mechanism main body 30, the first locking mechanism main body 30 is in driving fit with the power handle 20 and in limit fit with the housing main body 20; the cover body 11 comprises at least one first locking buckle 11-10; when the power handle 20 is pulled to switch on the load break switch, the power handle 20 drives the first locking mechanism main body 30 to drive the first locking hook 31 to move towards the first locking buckle 11-10, so that the first locking hook 31 is in locking fit with the first locking buckle 11-10; when the power handle 20 is pulled to open the load break switch, the first locking mechanism body 30 is reset and drives the first locking hook 31 to be far away from the first locking buckle 11-10, so that the first locking hook 31 is unlocked and matched with the first locking buckle 11-10.

Preferably, as shown in fig. 2 and 3, the first locking buckle 11-10 includes a first locking groove, and the first locking catch 31 is in locking engagement with the first locking groove.

Preferably, as shown in fig. 3, 5 and 7, the first locking mechanism 3 further includes a first return spring 3a, and when the power handle 20 is toggled to close the load break switch, the first return spring 3a drives the first locking mechanism 3 to return to be locked and matched with the cover 11. Further, as shown in fig. 2 and 3, the power handle 20 and the first return spring 3a are respectively disposed at two ends of the first locking mechanism main body 30, and are respectively in driving engagement with two ends of the first locking mechanism main body 30. Further, as shown in fig. 7, the first locking mechanism 3 further includes a first spring limiting plate 32 disposed at one end of the first locking mechanism main body 30, a first spring limiting post is disposed on the first spring limiting plate 32, one end of the first return spring 3a is sleeved on the first spring limiting post, and the other end of the first return spring is in limiting fit with the switch housing 1.

Preferably, as shown in fig. 5 and 6, the housing main body 12 includes a first track groove, and the first locking mechanism main body 30 is slidably disposed in the first track groove. Further, as shown in fig. 5 and 6, the housing main body 12 includes a first side wall 12-0 and a second side wall 12-1 which are oppositely disposed, and the first track groove is located between the first side wall 12-0 and the second side wall 12-1 and extends in a direction parallel to the moving direction of the movable contact system. Specifically, as shown in fig. 5 and 6, a plurality of first semi-insulating partition plates 15 and a plurality of second semi-insulating partition plates 13 are arranged on the inner side of the second side wall 12-1, the first semi-insulating partition plates 15 and the second semi-insulating partition plates 13 are both vertically connected with the second side wall 12-1, a first locking mechanism limiting groove is arranged at the joint of the first semi-insulating partition plates 15 and the second side wall 12-1, a second locking mechanism limiting groove is arranged at the joint of the second semi-insulating partition plates 13 and the second side wall 12-1, and the first locking mechanism limiting grooves and the second locking mechanism limiting grooves are matched to form a first rail groove for limiting and guiding the first locking mechanism 3.

Specifically, as shown in fig. 3, when the power handle 20 is shifted to the left to open the load break switch, the power handle 20 drives the first locking mechanism 3 to move to the left, so that the first locking hook 31 moves out of the first locking groove of the first locking buckle 11-10, and the locking engagement with the first locking buckle 11-10 is released; when the power handle 20 is shifted to the right to close the load break switch, the first return spring 3a applies a pushing force to the first locking mechanism 3 to move the first locking mechanism 3 to the right, so as to drive the first locking hook 31 to enter the first locking groove of the first locking catch 11-10, and the first locking hook and the first locking catch are locked and matched as shown in fig. 2.

Preferably, as shown in fig. 2 and 3, the cover body 11 includes a cover body 11-0 and at least one transparent surface cover 11-1 disposed on the cover body 11-0, the transparent surface cover 11-1 is snap-fitted with the cover body 11-0, and the surface cover 11-0 includes a first locking buckle 11-10. Further, as shown in FIG. 9, the cover body 11-0 includes a cover mounting hole 11-01 provided thereon for mounting the transparent cover 11-1; as shown in FIG. 4, the transparent face cover 11-1 comprises a face cover main body 11-11 and a face cover hook 11-12 arranged at one end of the face cover main body 11-11, one end of the face cover main body 11-11 is in limit fit with one end of the face cover mounting hole 11-01, and the face cover hook 11-12 at the other end of the face cover main body 11-11 is in snap fit with the other end of the face cover mounting hole 11-01. Specifically, as shown in fig. 4, the surface cover hooks 11-12 are hooks having a U-shaped structure, one end of the U-shaped structure is connected to the surface cover main body 11-11, and the other end is in spacing fit with the surface cover mounting hole 11-01. Of course, the surface cover hooks 11-12 are not limited to the above structure, and any structure that can achieve reliable installation and position limitation of the transparent surface cover 11-1 and the cover body 11-0 is within the scope of the present application.

Preferably, as shown in fig. 25, the transparent cover 11-1 further includes voltage detecting holes 11-14 disposed at intervals, and the voltage detecting holes are respectively matched with two fuse voltage detecting terminals of one fuse 1a, and the two fuse voltage detecting terminals are respectively connected with two fuse terminals of the fuse 1 a.

Specifically, as shown in fig. 1 and 5, the cover 11 includes three transparent covers 11-1, which are respectively matched with fuses 1a of three phase circuits of the load break switch of the present invention; the first locking mechanism 3 comprises three first locking hooks 31 axially arranged along a first locking mechanism main body 30, and the three first locking hooks are respectively in locking fit with the first locking buckles 11-10 of the three transparent surface covers 11-1.

Another important innovative aspect of the load break switch of the present invention, as illustrated in fig. 8-12, is the inclusion of a second locking mechanism 4, as follows:

as shown in fig. 8 and 9, the second locking mechanism 4 is in driving engagement with the cover 11, when the cover 11 is opened, the second locking mechanism 4 moves into limit engagement with the contact support 5 to prevent the moving contact system from moving, and when the cover 11 is closed, the second locking mechanism 4 is driven to release the limit engagement with the contact support 5. Note that the above-described cover 11 is opened or closed, including a case where the cover 11 is opened or closed as a whole, and a case where the transparent panel 11-1 on the cover 11 is opened or closed.

Preferably, as shown in fig. 8, the moving directions of the second locking mechanism 4 and the movable contact system are perpendicular to each other.

Preferably, as shown in fig. 11 and 12, the second locking mechanism 4 includes a second locking mechanism main body 40 and a second locking boss 41 provided on one side of the second locking mechanism main body 40, the second locking mechanism main body 40 being slidably fitted with the housing main body 12; the contact holder 5 includes a contact holder locking groove 52 provided at one side thereof; when the cover 11 is opened, the second locking mechanism body 40 acts to drive the second locking boss 41 to enter the contact supporting locking groove 52 to be in limit fit with the contact supporting locking groove, so as to prevent the moving contact system from moving; when the cover 11 is closed, the cover 11 drives the second locking mechanism body 40 to move and drives the second locking boss 41 to move out of the contact support locking slot 52, so that the second locking mechanism 4 is released from the limit fit with the contact support 5.

Preferably, as shown in fig. 8 and 10, the second locking mechanism 4 further includes a second locking spring 4 a; when the cover 11 is opened, the second locking spring 4a drives the second locking mechanism body 40 to move and drives the second locking boss 41 to enter the contact supporting locking groove 52 to be in limit fit with the contact supporting locking groove, so as to prevent the moving contact system from moving. Further, as shown in fig. 8 and 10, the second lock spring 4a and the cover 11 are respectively located at both ends of the first lock mechanism 4.

Specifically, as shown in fig. 10, the second locking mechanism main body 40 is an L-shaped structure, and includes a main body sliding plate 401 and a main body driven plate 402 that are connected by bending, the second locking boss 41 is disposed on one side of the main body sliding plate 401 facing the contact support 5, the main body driven plate 402 is in limit fit with one end of the second locking spring 4a, and when the cover 11 is opened, the second locking spring 4a makes the main body driven plate 402 press against the contact support 5 to be in limit fit therewith. Further, the side wall of the housing main body 12 is provided with a sliding plate rail structure which is matched with the main body sliding plate 401, so as to limit and guide the main body sliding plate 401, and the main body sliding plate 401 can only vertically slide relative to the contact support 5.

Preferably, as shown in fig. 8 and 9, the cover 11 further comprises cover driving bosses 11-13 in driving engagement with the second locking mechanism 4; when the cover body 11 is closed, the cover body driving bosses 11-13 drive the second locking mechanism 4 to move, so that the second locking mechanism 4 is released from the limit fit with the contact support 5. Further, as shown in fig. 8, the transparent cover 11-1 of the cover 11 includes a cover driving protrusion 11-13. Further, as shown in fig. 8 and 9, the cover 11 includes three transparent covers 11-1, and the three transparent covers 11-1 are respectively in driving engagement with the three second locking mechanisms 4.

Specifically, as shown in the direction of fig. 8, when the transparent cover 11-1 is opened, the corresponding second locking mechanism 4 is pushed by the second locking spring 4a to move leftward, so that the second locking boss 41 enters the contact support locking groove 52, the second locking mechanism 4 is in limit fit with the contact support 5, the moving of the moving contact system is prevented, and the load break switch cannot be switched on; when the transparent cover 11 is closed, the cover driving boss 11-13 presses against the corresponding second locking mechanism 4, so that the second locking mechanism moves rightwards, the second locking boss 41 moves out of the contact support locking groove 52, and the second locking mechanism 4 is released from the limit fit with the contact support 5. When the cover 11 is opened integrally, the three second locking mechanisms 4 all move leftward and are in limit fit with the contact supports 5, the contact supports 5 are locked, and the load break switch cannot be switched on.

As shown in fig. 5, 6, 24 and 25, another important innovation of the loadbreak switch of the present invention is the inclusion of a first insulating spacer, as follows:

as shown in fig. 5 and 6, a first insulating barrier is provided between the fuse 1a and the fuse holder 9. Further, as shown in fig. 5 and 6, the first insulating partition includes two first semi-insulating partitions 15 disposed oppositely, the two first semi-insulating partitions 15 are respectively disposed on a pair of shell side walls of the switch shell 1, a terminal avoiding groove for the fuse terminal of the fuse 1a to pass through is disposed at a junction of the two first semi-insulating partitions 15, and the fuse terminal abuts against a bottom surface of the terminal avoiding groove.

Preferably, as shown in fig. 24 and 25, the switch case 1 further includes a fuse support plate for supporting the fuse 1a, the fuse support plate including two half support plates 14 respectively provided on a pair of side walls of the switch case 1. Further, as shown in fig. 25, two ends of each half support plate 14 are respectively connected with two first half insulating partition plates 15 in a bending manner, and the whole half support plate is in a zigzag structure. The first insulating partition plate, the fuse supporting plate and the wiring end avoiding groove are matched, so that the fuse 1a is reliably installed, limited and positioned, the fuse 1a is isolated from other elements in the load break switch, and the fuse 1a is guaranteed to reliably and stably work.

Preferably, as shown in fig. 5 and 6, a second insulating partition is provided between the fuse wire holders 9 of adjacent said phase circuits, the second insulating partition comprising two second semi-insulating partitions 13 respectively provided on a pair of housing side walls of the switch housing 1. Further, as shown in fig. 6, a first insulating partition plate and a second insulating partition plate are respectively disposed on both sides of each fuse 9. The second insulating partition board is beneficial to improving the creepage distance and the insulating gap between adjacent phase circuits and improving the insulating property of the load break switch.

Specifically, the first sidewall 12-0 and the second sidewall 12-1 are respectively provided with a first semi-insulating partition 15, a semi-supporting plate 14 and a second semi-insulating partition 13, which are located at one end of the first sidewall 12-0 and the second sidewall 12-1 close to the cover 11.

Another important innovation of the loadbreak switch of the present invention, as shown in fig. 8, 10-12, and 24-25, is the inclusion of a screw lead-in structure 2a, specifically as follows:

preferably, as shown in fig. 8 and 10, the load break switch of the present invention further comprises an input terminal block 4i, the switch housing 1 comprises a housing first side 1-0 and a housing second side 1-1 which are oppositely arranged, the input terminal block 4i is arranged on the housing first side 1-0, and two ends of the screw lead-in structure 2a are respectively arranged near the housing first side 1-0 and the housing second side 1-1; when the load break switch is in wiring, a user conveys a busbar connecting screw 21a to the first side 1-0 of the shell from the second side 1-1 of the shell through the screw leading-in structure 2a, and fixedly connects the input wiring board 4i with the incoming busbar. Further, as shown in fig. 10, the screw introducing structure 2a is a cylindrical structure, and includes a introducing structure main body 20a and two ring-shaped clamping grooves 200a respectively disposed at two ends of the introducing structure main body 20a, and the screw introducing structure 2a is in limit fit with the switch housing 1 through the two ring-shaped clamping grooves 200. Further, as shown in fig. 12, 24 and 25, the half support plates 14 are provided with a semi-circular limiting groove of the lead-in structure, two ends of the screw lead-in structure 2a are limited by the two half support plates 14, and each ring-shaped clamping groove 200a is in limit fit with the side walls of the semi-circular limiting grooves of the two lead-in structures. Further, the inlet end of the screw introduction structure 2a is shielded by the fuse 1 a.

Preferably, as shown in fig. 12, the screw introduction structure 2a and the contact support 5 are perpendicular to each other, the contact support 5 includes an introduction structure avoiding hole 500 through which the screw introduction structure 2a passes, and the introduction structure avoiding hole 500 is a kidney-shaped hole.

Specifically, as shown in fig. 8, 21 and 26, the load break switch of the present invention comprises three input terminal boards 4-i arranged side by side at intervals on a first side 1-0 of a housing, which are respectively a first phase input terminal board 4-1i, a second phase input terminal board 4-2i and a third phase input terminal board 4-3i, and three screw introduction structures 2a respectively arranged corresponding to the three input terminal boards 4-i; the first phase input terminal plate 4-1i, the second phase input terminal plate 4-2i and the third phase input terminal plate 4-3i are respectively connected with three contact systems of three phase circuits; the first output terminal plate 5-1o, the second output terminal plate 5-2o and the third output terminal plate 5-3o are connected to the other three contact systems of the three connection paths, respectively.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A load break switch comprises a switch shell (1), an operating mechanism (2) and a contact system, wherein the operating mechanism and the contact system are respectively arranged in the switch shell (1); the operating mechanism (2) comprises a power handle (20), the contact system comprises a moving contact system and a fixed contact (8) which are matched with each other, and the moving contact system comprises a contact support (5) and a moving contact component (6) arranged on the contact support (5); the power handle (20) is shifted to drive the moving contact system to move in a reciprocating manner, so that the moving contact assembly (6) and the static contact (8) are closed/opened; the method is characterized in that:

the switch shell (1) comprises a cover body (11) and a shell main body (12), wherein the cover body (11) is arranged on one side of the shell main body (12);

the load break switch also comprises a first locking mechanism (3) in driving fit with the operating mechanism (2); when the operating mechanism (2) is operated to close the load break switch, the first locking mechanism (3) moves and is in locking fit with the cover body (11) to prevent the cover body (11) from being opened, and when the operating mechanism (2) is pushed to open the load break switch, the operating mechanism (2) drives the first locking mechanism (3) to move to release the locking fit with the cover body (11).

2. The load break switch of claim 1, wherein: the moving directions of the first locking mechanism (3) and the moving contact system are parallel to each other.

3. The load break switch of claim 1, wherein: the operating mechanism (2) comprises a power handle (20) which is in driving fit with the first locking mechanism (3); when the power handle (20) is pulled to switch on the load break switch, the first locking mechanism (3) moves to be matched with the cover body (11) in a locking mode; when the power handle (20) is pulled to open the load break switch, the power handle (20) drives the first locking mechanism (3) to move to release the locking fit with the cover body (11).

4. The load break switch of claim 3, wherein: the first locking mechanism (3) comprises a first locking mechanism main body (30) and at least one first locking hook (31) arranged on the first locking mechanism main body (30), and the first locking mechanism main body (30) is in driving fit with the power handle (20) and is in limiting fit with the shell main body (20); the cover (11) comprises at least one first locking buckle (11-10);

when the power handle (20) is pulled to switch on the load break switch, the power handle (20) drives the first locking mechanism main body (30) to drive the first locking hook (31) to move towards the first locking buckle (11-10), so that the first locking hook (31) is in locking fit with the first locking buckle (11-10); when the power handle (20) is pulled to open the load break switch, the first locking mechanism main body (30) is reset and drives the first locking hook (31) to be far away from the first locking buckle (11-10), so that the first locking hook (31) is unlocked and matched with the first locking buckle (11-10).

5. The load break switch of claim 4, wherein: the first locking buckle (11-10) comprises a first locking groove, and the first locking clamping hook (31) is in locking fit with the first locking groove.

6. The load break switch of claim 4, wherein: the housing body (12) comprises a first track groove, and the first locking mechanism body (30) is arranged in the first track groove in a sliding mode; the shell main body (12) comprises a first side wall (12-0) and a second side wall (12-1) which are oppositely arranged, and the first track groove is positioned between the first side wall (12-0) and the second side wall (12-1) and extends in a direction parallel to the moving direction of the movable contact system.

7. The load break switch according to any of claims 1-6, wherein: the first locking mechanism (3) further comprises a first reset spring (3a), and when the power handle (20) of the operating mechanism (2) is pulled to enable the load break switch to be switched on, the first reset spring (3a) drives the first locking mechanism (3) to move, reset and be matched with the cover body (11) in a locking mode.

8. The load break switch of claim 7, wherein: the power handle (20) and the first return spring (3a) are respectively arranged at two ends of the first locking mechanism main body (30).

9. The load break switch of claim 4, wherein: the cover body (11) comprises a cover body main body (11-0) and at least one transparent surface cover (11-1) arranged on the cover body main body (11-0), the transparent surface cover (11-1) is in snap fit with the cover body main body (11-0), and the surface cover (11-0) comprises a first locking buckle (11-10).

10. The load break switch of claim 9, wherein: one end of the cover body (11) is hinged with the shell main body (12), and the other end of the cover body is in limit fit with the shell main body (12); after the first locking mechanism (3) is in spacing-free fit with the cover body (11), the cover body (11) can be rotated and opened relative to the shell main body (12);

the cover body main body (11-0) comprises a surface cover mounting hole (11-01) which is arranged on the cover body main body and used for mounting the transparent surface cover (11-1); the transparent face cover (11-1) comprises a face cover main body (11-11) and a face cover clamping hook (11-12) arranged at one end of the face cover main body (11-11), one end of the face cover main body (11-11) is in limit fit with one end of the face cover mounting hole (11-01), and the face cover clamping hook (11-12) at the other end of the face cover main body (11-11) is in snap fit with the other end of the face cover mounting hole (11-01);

the load break switch further comprises a fuse (1a), the transparent surface cover (11-1) and the fuse (1a) are arranged in a one-to-one correspondence mode, and the transparent surface cover (11-1) further comprises two voltage detecting holes (11-14) which are arranged at intervals and are respectively matched with two fuse voltage detecting ends of the fuse (1a) in a corresponding mode.