Load Break Switch

Abstract

The present invention relates to the field of low-voltage electrical appliances, and in particular to a load circuit breaker, wherein a switch housing comprises a cover body and a housing body, wherein the cover body is arranged on one side of the housing body; the load circuit breaker also comprises a first locking mechanism driven and matched with an operating mechanism; when the operating mechanism is operated to close the load circuit breaker, the first locking mechanism moves and locks with the cover body to prevent the cover body from being opened; when the operating mechanism is toggled to open the load circuit breaker, the operating mechanism drives the first locking mechanism to move and release the locking cooperation with the cover body; the load circuit breaker of the present invention has high safety.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a load circuit breaker, in particular to a load circuit breaker with a strip-shaped housing and fuses connected in series to each phase circuit. Background Art

[0002] The load-break switch, with an energy storage isolating switch and a pluggable fuse group, is an important switch device used to connect / disconnect the power distribution system; in order to disconnect the input current from the load end, the user can manually operate the power handle of the operating mechanism to disconnect the moving / static contacts inside the load-break switch.

[0003] Existing load-breaking switches often have the following problems:

[0004] 1. The moving contact system of the existing load-breaking switch is mostly set in a sliding manner, which is easy to wear after long-term use, affecting the reliability and smoothness of the load-breaking switch operation.

[0005] 2. Existing load-breaking switches do not have a reliable locking protection mechanism, and it is easy for the shell to be closed when it is open or the shell to be opened when it is closed, which seriously affects the safety of users' electricity use.

[0006] 3. In the existing load-breaking switch, the moving contact assembly and the contact support of the moving contact system are not assembled securely, and the moving contact assembly is prone to detach from the contact support, resulting in failure of the load-breaking switch.

[0007] 4. The arc extinguishing efficiency of the existing load-breaking circuit breaker is insufficient, and the product is prone to generate large arcs when connected / disconnected. Large arcing can easily lead to safety hazards in the circuit; in addition, the arc extinguishing grid fixing and limiting structure of the arc extinguishing chamber is complex and difficult to install.

[0008] 5. The existing load-breaking switch has a complex installation structure and is difficult to operate.

[0009] 6. The arrangement of the output end of the existing load-breaking switch is unreasonable, resulting in a smaller specification of the output end, limiting the current-carrying capacity of the load-breaking switch, and making wiring inconvenient. Summary of the invention

[0010] The object of the present invention is to overcome the defects of the prior art and provide a load breaking switch with high safety.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A load-breaking switch, comprising a switch housing 1, an operating mechanism 2 and a contact system respectively arranged in the switch housing 1; the operating mechanism 2 comprises a power handle 20, the contact system comprises a moving contact system and a stationary contact 8 used in conjunction with each other, the moving contact system comprises a contact support 5 and a moving contact assembly 6 arranged on the contact support 5; the power handle 20 is toggled to drive the moving contact system to reciprocate, so that the moving contact assembly 6 and the stationary contact 8 are closed / opened;

[0013] The switch housing 1 comprises a cover 11 and a housing body 12, wherein the cover 11 is arranged on one side of the housing body 12;

[0014] The load circuit breaker also includes a first locking mechanism 3 driven and cooperated with the operating mechanism 2; when the operating mechanism 2 is operated to close the load circuit breaker, the first locking mechanism 3 moves and locks with the cover body 11 to prevent the cover body 11 from being opened; when the operating mechanism 2 is turned to open the load circuit breaker, the operating mechanism 2 drives the first locking mechanism 3 to move and release the locking cooperation with the cover body 11.

[0015] Preferably, the moving directions of the first locking mechanism 3 and the moving contact system are parallel to each other.

[0016] Preferably, the operating mechanism 2 includes a power handle 20 driven and cooperated with the first locking mechanism 3; when the power handle 20 is turned to close the load circuit breaker, the first locking mechanism 3 moves and locks with the cover body 11; when the power handle 20 is turned to open the load circuit breaker, the power handle 20 drives the first locking mechanism 3 to move and release the locking cooperation with the cover body 11.

[0017] Preferably, the first locking mechanism 3 includes a first locking mechanism body 30 and at least one first locking hook 31 arranged on the first locking mechanism body 30, the first locking mechanism body 30 is drivingly matched with the power handle 20 and limitedly matched with the shell body 20; the cover body 11 includes at least one first locking buckle 11-10;

[0018] When the power handle 20 is moved to close the load circuit breaker, the power handle 20 drives the first locking mechanism body 30 to drive the first locking hook 31 to move toward the first locking buckle 11-10, so that the first locking hook 31 is locked with the first locking buckle 11-10; when the power handle 20 is moved to open the load circuit breaker, the first locking mechanism body 30 is reset and drives the first locking hook 31 away from the first locking buckle 11-10, so that the first locking hook 31 is released from the locking cooperation with the first locking buckle 11-10.

[0019] Preferably, the first locking buckle 11 - 10 includes a first locking groove, and the first locking hook 31 is locked and matched with the first locking groove.

[0020] Preferably, the shell body 12 includes a first track groove, and the first locking mechanism body 30 is slidably arranged in the first track groove; the shell body 12 includes a first side wall 12-0 and a second side wall 12-1 arranged opposite to each other, and the first track groove is located between the first side wall 12-0 and the second side wall 12-1, and its extension direction is parallel to the moving direction of the moving contact system.

[0021] Preferably, the first locking mechanism 3 further includes a first reset spring 3a. When the power handle 20 of the operating mechanism 2 is turned to close the load circuit breaker, the first reset spring 3a drives the first locking mechanism 3 to move and reset and cooperate with the locking of the cover body 11.

[0022] Preferably, the power handle 20 and the first return spring 3a are respectively arranged at two ends of the first locking mechanism body 30.

[0023] Preferably, the cover body 11 includes 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 snap-fitted with the cover body main body 11-0, and the surface cover 11-0 includes a first locking buckle 11-10.

[0024] Preferably, one end of the cover body 11 is hinged to the shell body 12, and the other end is limitedly engaged with the shell body 12; after the first locking mechanism 3 and the cover body 11 are released from the limited engagement, the cover body 11 can be rotated and opened relative to the shell body 12.

[0025] Preferably, the cover body main body 11-0 includes a cover mounting hole 11-01 arranged thereon for mounting a transparent cover 11-1; the transparent cover 11-1 includes a cover body 11-11 and a cover hook 11-12 arranged at one end of the cover body 11-11, one end of the cover body 11-11 is limitedly engaged with one end of the cover mounting hole 11-01, and the cover hook 11-12 at the other end of the cover body 11-11 is snap-fitted with the other end of the cover mounting hole 11-01.

[0026] Preferably, the load circuit breaker further comprises a fuse 1a, and the transparent cover 11-1 is arranged in one-to-one correspondence with the fuse 1a, and the transparent cover 11-1 further comprises two voltage detection holes 11-14 arranged at intervals, which respectively correspond to the two fuse voltage detection terminals of the fuse 1a.

[0027] The load circuit breaker of the present invention has a first locking mechanism that prevents the cover from being opened when the load circuit breaker is in a closed state, thereby preventing the cover from being opened in unexpected circumstances (people without operating authority opening the cover or users mistakenly opening the cover, etc.) and causing electric shock accidents, thereby ensuring the user's electricity safety and ensuring the stability and reliability of the load circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the switch housing of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the first locking mechanism of the present invention, the load-breaking switch is in a closed state, and the cover is locked;

[0030] Figure 3 It is a structural schematic diagram of the first locking mechanism of the present invention, the load-breaking switch is in the open state, and the cover is unlocked;

[0031] Figure 4 The present invention Figure 2 A schematic diagram of the enlarged structure of part A;

[0032] Figure 5 It is a schematic structural diagram of the load-breaking switch of the present invention, and at least shows the positional relationship between the first side wall, the second side wall and each fuse;

[0033] Figure 6 The present invention Figure 5 A schematic diagram of the enlarged structure of part B;

[0034] Figure 7 The present invention Figure 5 A schematic diagram of the enlarged structure of part C;

[0035] Figure 8 It is a schematic structural diagram of a load-breaking switch of the present invention, showing at least the components of one phase circuit and their assembly relationship;

[0036] Fig. 9 is a schematic structural diagram of a load-break switch of the present invention, showing at least a second locking mechanism;

[0037] Fig.10 The present invention Fig. 9 An enlarged structural diagram of part D;

[0038] Fig.11 It is a schematic diagram of the structure of the load-breaking switch of the present invention, which at least shows the positional relationship between the screw introduction structure and the contact support;

[0039] Fig.12 The present invention Fig.11 An enlarged structural diagram of part E;

[0040] Fig.13 It is a structural schematic diagram of the moving contact system of the present invention;

[0041] Fig.14 The present invention Fig.13 An enlarged structural diagram of part F;

[0042] Fig.15 It is a schematic diagram of the structure of the contact support of the present invention;

[0043] Fig.16 The present invention Fig.15 A schematic diagram of the enlarged structure of part G;

[0044] Fig.17 It is a structural schematic diagram of the movable contact system of the present invention, which at least shows the assembly relationship between the movable contact assembly and the contact support;

[0045] Fig.18 It is a structural schematic diagram of the moving contact assembly of the present invention;

[0046] Fig.19 It is a schematic diagram of the coordination structure of the contact system and the arc extinguishing system of the present invention;

[0047] Fig.20a It is a three-dimensional structural schematic diagram of the coordination of the contact system and the arc extinguishing system of the present invention;

[0048] Fig.20b It is a structural schematic diagram of the arc extinguishing chamber of the present invention;

[0049] Fig.20c The present invention Fig.20b A schematic diagram of the enlarged structure of the K part;

[0050] Fig.21 It is a schematic diagram of the structure of the three-phase circuit of the present invention;

[0051] Fig.21a is a schematic diagram of the structure of the three-phase circuit of the present invention, and Fig.21 The contact support is omitted.

[0052] Fig. 22 It is a schematic diagram of the side projection of the arrangement of the three output ends of the present invention;

[0053] Fig.23 It is a front projection schematic diagram of the arrangement of the three output ends of the present invention;

[0054] Fig.24 It is a schematic diagram of the structure of the load-breaking switch of the present invention, which at least shows the assembly position of the fuse;

[0055] Fig.25 The present invention Fig.24 A schematic diagram of the enlarged structure of the H part;

[0056] Fig.26 is a schematic diagram of the structure of the switch installation structure of the present invention, at least showing a schematic diagram of the assembly structure of the first buckle and the first buckle installation structure;

[0057] Fig. 27The present invention Fig.26 An enlarged structural diagram of part I;

[0058] Fig.28 is a schematic diagram of the structure of the switch installation structure of the present invention, at least showing a schematic diagram of the disassembled structure of the first buckle and the first buckle installation structure;

[0059] Fig.29 The present invention Fig.28 An enlarged structural diagram of the J portion;

[0060] Fig.30 It is an implementation mode of the switch installation structure of the present invention, and shows a schematic diagram of its matching structure with the switch fixing plate.

[0061] Fig.31 This is another embodiment of the switch installation structure of the present invention, and shows a schematic diagram of its matching structure with the switch fixing plate. DETAILED DESCRIPTION

[0062] The following is combined with Figure 1-31 The following embodiments are provided to further illustrate the specific implementation of the load break switch of the present invention. The load break switch of the present invention is not limited to the description of the following embodiments.

[0063] like Figure 1 and 8 As shown, 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 arranged in the switch housing 1, the operating mechanism 2 includes a power handle 20, the phase circuit includes a fuse 1a, a contact system and an arc extinguishing chamber 7, the contact system is connected in series with the fuse 1a, the arc extinguishing chamber 7 is used in conjunction with the contact system, the contact system includes a moving contact system and a stationary contact 8 used in conjunction, and the power handle 20 is moved to drive the moving contact system to reciprocate, so that the moving contact system and the stationary contact 8 are closed / opened.

[0064] The main improvements of the load circuit switch of the present invention are as follows:

[0065] Preferably, Fig.21 and 21aAs shown, each phase circuit 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 stationary contacts 8 arranged at intervals and two moving contact assemblies 6 arranged side by side and at intervals between the two stationary contacts 8. The two ends of the two moving contact assemblies 6 are respectively matched with the two stationary contacts 8. Each stationary contact 8 includes a stationary contact plate 82 respectively matched with one end of the two moving contact assemblies 6. One end of the two moving contact assemblies 6 is respectively matched with the two stationary contact plates 82 of one stationary contact, and the other end of the two moving contact assemblies 6 is respectively matched with the two stationary contact plates 82 of the other stationary contact. In each phase circuit, the two contact systems are provided to form eight breakpoints (i.e., each contact system forms four breakpoints), thereby significantly reducing the current and voltage values ​​at each breakpoint, so that the load-breaking switch of the present invention can be applied to the disconnection of higher currents and voltages.

[0066] It should be noted that more groups of contact systems (>2 groups) can be set in each phase circuit to make the load circuit breaker of the present invention suitable for disconnecting higher currents and voltages; in the technical solution of the load circuit breaker switch of the present invention, 2 groups of contact systems are preferably set in each phase circuit.

[0067] Preferably, Fig. 9 and 10 , Fig.11 , Fig.12 , Fig.13 As shown, the load-breaking switch of the present invention includes a first guide limit structure, and the contact support 5 cooperates with the switch housing 1 through the first guide limit structure. The first guide limit structure includes a rolling device and a rolling track for use with the contact support 5. 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; or the switch housing 1 is provided with a rolling device, and the contact support 5 is provided with a rolling track. Further, as Fig. 9 and 10 , Fig.11 , Fig.12 , Fig.13 As shown, the moving contact system includes a contact support 5 and a moving contact assembly 6 arranged on the contact support 5; the contact support 5 includes a contact support body 50 and a rolling device arranged on the contact support body 50 and matched with the switch housing 1. The rolling device of the load-breaking switch of the present invention can significantly reduce the friction force on the moving contact system during the movement process, making the movement of the contact system smoother, and the rotational inertia can accelerate the opening and closing efficiency of the load-breaking switch of the present invention. Further, as Fig.10As shown, the rolling device includes a rolling bearing 51, and the contact support body 50 includes a bearing mounting shaft 501 for mounting the rolling bearing 51; the switch housing 1 also includes a rolling track that cooperates with the rolling bearing 51. Further, the switch housing 1 includes a housing body 12, and the housing body 12 includes two housing side walls that are arranged opposite to each other, namely a first side wall 12-0 and a second side wall 12-1 (see Figure 6 ), the contact support 5 is located between the first side wall 12-0 and the second side wall 12-1, and each shell side wall includes a rolling track that cooperates with the rolling bearing 51; the contact support 5 includes at least two rolling devices, which are respectively arranged on the two sides of the contact support 5 opposite to the two shell side walls.

[0068] It should be pointed out that the first guide and limit structure can not only be a rolling device and a rolling track used in conjunction with each other, but also a sliding rail and a slideway used in conjunction with each other. The first guide and limit structure of the load circuit breaker of the present invention is preferably a rolling device and a rolling track used in conjunction with each other. Compared with the sliding rail and the slideway used in conjunction with each other, the friction force is smaller, the movement of the moving contact system is smoother, and the operation performance of the load circuit breaker can be significantly improved.

[0069] It should be noted that the rolling device is not limited to being installed on the two sides of the contact support 5 that are respectively opposite to the two side walls of the housing, but can also be arranged on the other two side surfaces of the contact support 5 (such as Fig. 9 and 10 As shown, the upper and lower sides of the contact support 5), as long as the rolling device can be reliably matched with the switch housing 1; the load circuit breaker of the present invention preferably uses the above-mentioned method to arrange the rolling device, which has a simple structure, easy assembly and reliable operation.

[0070] Preferably, Figure 1 As shown, the switch housing comprises a cover body 11 and a housing body 12, wherein the cover body 11 is arranged on one side of the housing body 12 and is limitedly matched therewith; Figure 2 and 3 As shown, the load circuit breaker of the present invention further includes a first locking mechanism 3 driven and cooperated with the operating mechanism 2; when the operating mechanism 2 is operated to close the load circuit breaker, the first locking mechanism 3 moves and locks 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 circuit breaker, the power handle 20 drives the first locking mechanism 3 to move and release the locking cooperation with the cover body 11. The first locking mechanism 3 of the load circuit breaker of the present invention prevents the cover body 11 from being opened when the load circuit breaker is closed, thereby preventing the cover body 11 from being opened in unexpected circumstances (personnel without operating authority opens the cover body 11 or the user mistakenly opens the cover body 11, etc.), resulting in electric shock accidents, thereby ensuring the user's electricity safety and ensuring the stability and reliability of the load circuit breaker. Further, as Figure 2 and 3 As shown, the operating mechanism 2 includes a power handle 20 that is driven and matched with the first locking mechanism 3; when the power handle 20 is turned to close the load circuit breaker, the first locking mechanism 3 moves to lock and match with the cover 11 to prevent the cover 11 from being opened; when the power handle 20 is turned to open the load circuit breaker, the power handle 20 drives the first locking mechanism 3 to move and release the locking match with the cover 11. Further, as Figure 2 and 3 As shown, the first locking mechanism 3 includes a first locking mechanism body 30 and at least one first locking hook 31 arranged on the first locking mechanism body 30, the first locking mechanism body 30 is driven and cooperated with the power handle 20 and is limited and cooperated with the shell body 12; the cover body 11 includes at least one first locking buckle 11-10; when the power handle 20 is turned to close the load circuit breaker, the power handle 20 drives the first locking mechanism 30 to drive the first locking hook 31 to move toward the first locking buckle 11-10, so that the first locking hook 31 is locked and cooperated with the first locking buckle 11-10; when the power handle 20 is turned to open the load circuit breaker, the first locking mechanism 30 is reset and drives the first locking hook 31 away from the first locking buckle 11-10, so that the first locking hook 31 is released from the locking cooperation with the first locking buckle 11-10.

[0071] Preferably, Figure 2 and 3 As shown, the first locking mechanism 3 and the moving direction of the moving contact system are parallel to each other.

[0072] Preferably, Figure 7 As shown, the first locking mechanism 3 also includes a first reset spring 3a. When the power handle 20 is turned to close the load circuit breaker, the first reset spring 3a drives the first locking mechanism 3 to move and reset and lock with the cover body 11. In the load circuit breaker of the present invention, the power handle 20 and the first locking mechanism 3 do not need to be connected. When the power handle 20 is turned to open the load circuit breaker, the power handle 20 squeezes the first locking mechanism 3 to release it from the cover body 11. When the power handle 20 is turned to close the load circuit breaker, the power handle 20 releases the first locking mechanism 3, and the first reset spring 3a resets the first locking mechanism 3 to lock with the cover body 11, thereby ensuring the working reliability and stability of the first locking mechanism 3 and preventing the first locking mechanism 3 from being damaged due to improper operation of the power handle 20. It should be pointed out that the first locking mechanism 3 may also not be provided with the first return spring 3a, but may be directly driven and connected to the power handle 20. Of course, the structures of the first locking mechanism 3 and the power handle 20 need to be adaptively adjusted. The swing of the power handle 20 can drive the first locking mechanism 3 to move back and forth, locking or unlocking the cover body 11, which also falls within the protection scope of the load circuit breaker of the present invention.

[0073] Preferably, Figure 8-12 As shown, the load circuit breaker of the present invention further includes a second locking mechanism 4 that cooperates with the cover body 11. When the cover body 11 is opened, the second locking mechanism 4 actuates to cooperate with the moving contact system or the operating mechanism 2 to prevent the load circuit breaker from closing. When the cover body 11 is closed, the cover body 11 drives the second locking mechanism 4 to release the limit cooperation with the moving contact system or the operating mechanism 2. In the load circuit breaker of the present invention, the second locking mechanism 4 cooperates with the operating mechanism or the moving contact system to prevent the load circuit breaker from closing, which can avoid closing the circuit breaker when the cover body 11 is open (for example, when the user is repairing the load circuit breaker or replacing parts), thereby ensuring the user's power safety. It should be pointed out that in the load circuit breaker of the present invention, the operating mechanism 2 drives the moving contact system to move to close / open the circuit breaker. Therefore, as long as the cover body 11 is opened, the second locking mechanism 4, whether it cooperates with the operating mechanism or the moving contact system, can prevent the moving contact system from moving, making it impossible to close the load circuit breaker. Further, as Figure 8-12 As shown, when the cover 11 is opened, the second locking mechanism 4 moves to cooperate with the contact support 5 to prevent the moving contact system from moving, and the load-breaking switch cannot be closed; when the cover 11 is closed, the cover 11 drives the second locking mechanism 4 to move and release the limited cooperation with the contact support 5. Fig. 9 and 12 As shown, the second locking mechanism 4 includes a second locking mechanism body 40 and a second locking boss 41 arranged on one side of the second locking mechanism body 40, and the second locking mechanism body 40 is slidably matched with the shell body 12 of the switch shell 1; the contact support 5 includes a contact support locking groove 52 arranged on one side thereof; when the cover body 11 is opened, the second locking mechanism body 40 is actuated and drives the second locking boss 41 to enter the contact support locking groove 52 and cooperate with it in a limiting manner to prevent the moving contact system from moving; when the cover body 11 is closed, the cover body 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 groove 52, so that the second locking mechanism 4 releases the limiting cooperation with the contact support 5.

[0074] Preferably, Fig. 9 As shown, the second locking mechanism 4 and the moving direction of the moving contact system are perpendicular to each other.

[0075] Preferably, Figure 8 and 10 As shown, the second locking mechanism 4 also includes a second locking spring 4a. When the cover body 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 support locking groove 52 to cooperate with its limit position, thereby preventing the moving contact system from moving and the load circuit breaker cannot be closed.

[0076] Preferably, Figure 13-18 As shown, an improved moving contact system of the load-breaking switch of the present invention is provided. Specifically: the moving contact assembly 6 includes two moving contacts 61 and a contact assembly shaft 60 that are relatively spaced apart. The contact assembly shaft 60 is provided in the middle of the moving contact assembly 6 and passes through the two moving contacts 61; the contact support 5 includes a contact assembly hole 502, a contact assembly crossbeam 5020 is provided in the middle of the contact assembly hole 502, and a contact assembly shaft groove 5021 is provided in the middle of the contact assembly crossbeam 5020; the moving contact assembly 6 is inserted into the contact assembly groove 502 and both ends protrude on both sides of the contact support 5, the contact assembly shaft 60 is in the contact assembly shaft groove 5021, and the two moving contacts 61 are respectively located on both sides of the contact assembly crossbeam 5020 and are limitedly matched with the contact assembly crossbeam 5020. Further, as Figure 13-18 As shown, the moving contact assembly 6 also includes two moving contact spring pieces 62 that are relatively spaced apart. The two moving contact spring pieces 62 are respectively arranged on both sides of the two moving contacts 61 . The two ends of each moving contact spring piece 62 are respectively pressed against the two ends of a moving contact 61 . The moving contact assembly shaft 62 also passes through the two moving contact spring pieces 62 .

[0077] Preferably, Fig.18 As shown, the moving contact 61 includes a moving contact groove 611 arranged in the middle thereof, and the two moving contact grooves 611 of the two moving contacts 6 of the moving contact assembly 6 protrude in opposite directions respectively, and the spacing between the bottom surfaces of the two moving contact grooves 611 matches the thickness of the contact assembly beam 5020, and the spacing between the ends of the two moving contacts 61 is smaller than the thickness of the moving contact assembly beam 5020.

[0078] Preferably, Fig.16 and 18 As shown, in the moving contact assembly 6, at least one moving contact 61 is provided with a moving contact limiting groove 610, and the contact assembly beam 5020 is provided with a contact limiting protrusion 5022; the contact assembly shaft 60 and the contact assembly beam 5020 are limited and cooperated to prevent the moving contact assembly 6 from escaping from one end of the contact assembly hole 502, and the contact limiting protrusion 5022 and the contact limiting groove 610 are limited and cooperated to prevent the moving contact assembly 6 from escaping from the other end of the contact assembly hole 502.

[0079] The load-breaking switch of the present invention has a moving contact system including a contact support 5 and a moving contact assembly 6. The moving contact assembly 6 has a stable structural assembly. The moving contact spring piece 62 ensures the contact reliability between the moving contact 61 and the stationary contact 8. The assembly of the moving contact assembly 6 and the contact support 5 is reliable and stable, ensuring that the moving contact assembly 6 moves synchronously with the contact support 5, thereby ensuring the action performance of the moving contact system.

[0080] Preferably, Fig.13 and 14As shown, the contact support 5 includes a plurality of groups of movable contact assembly holes 502, each group of movable contact assembly holes 502 includes two movable contact assembly holes 502 arranged side by side along the contact support 5, and the plurality of groups of movable contact assembly holes 502 are arranged in sequence and spaced apart along the axial direction of the contact support 5. Fig.14 As shown, the contact support 5 also includes a moving contact enclosure 503 of an E-shaped structure, and moving contact enclosures 503 are provided on the outer sides of both ends of each group of contact assembly holes 502. The two side-by-side enclosure spaces included in the moving contact enclosure 503 are respectively matched with the two contact assembly holes 502 of the same group, and the open ends of the E-shaped structure of each moving contact enclosure 503 are all facing the static contact 8 matched with the moving contact assembly 6. The load-breaking switch of the present invention, the moving contact enclosure 503 is conducive to increasing the insulation gap and creepage distance between the two moving contact assemblies 6 of the same group and between the two adjacent groups of moving contact assemblies 6, and can also play a role in blocking arcs, greatly improving the live operation performance, connection and disconnection performance and short-circuit circuit breaking capacity of the load-breaking switch.

[0081] Preferably, Fig.10 , 20b As shown in 20c, an improved arc extinguishing chamber 7 of the load-breaking switch of the present invention is shown, specifically: the arc extinguishing chamber 7 includes two arc extinguishing chamber side walls 70 arranged relatively at an interval and an arc extinguishing grid group arranged between the two arc extinguishing chamber side walls 70, and the arc extinguishing grid group includes multiple arc extinguishing grids 72 arranged between the two arc extinguishing chamber side walls 70; the arc extinguishing chamber 7 also includes multiple groups of grid assembly grooves 700, each group of grid assembly grooves 700 includes two grid assembly grooves 700 respectively arranged on the two arc extinguishing chamber side walls 70, and the insertion end of at least one grid assembly groove 700 in each group of grid assembly grooves 700 is provided with a grid clamp 701; the arc extinguishing grid 72 includes two arc guiding semicircular grooves 702 arranged side by side at an interval on one end thereof located at the entrance of the arc extinguishing chamber, and the two arc guiding semicircular grooves 702 are used to correspond to the two moving contact assemblies 6 respectively. In the arc extinguishing chamber 7 of the present invention, the arc extinguishing grid 72 includes two arc-guiding semicircular grooves 702 arranged side by side and spaced apart, so that the arc extinguishing chamber 7 can cooperate with two moving contact assemblies 6 at the same time, thereby improving the arc-strike efficiency and arc-extinguishing effect of the arc extinguishing chamber 7. In addition, the grid plate clamping table 701 simplifies the assembly method of the arc extinguishing grid 72, making the structure of the arc extinguishing chamber 7 simpler and easier to assemble. Furthermore, the grid plate assembly groove 700 is inclined, and a guide slope is also provided at the entrance of the grid plate assembly groove 700 to facilitate the insertion of the arc extinguishing grid 72, so that the arc extinguishing grid 700 is easier to insert into the grid plate assembly groove 700, thereby improving the assembly efficiency of the arc extinguishing chamber 7.

[0082] Preferably, Figure 26-31As shown, the switch housing 1 further includes a switch mounting structure, which includes a first buckle 70a and a second buckle 70-1a respectively arranged at two ends of the bottom of the switch housing 1, and the first buckle 70a and the second buckle 70-1a are respectively limitedly matched with the switch fixing plate. Figure 26-30 As shown, the second buckle 70-1a is fixedly mounted on the switch housing 1, the first buckle 70 is slidably mounted on the switch housing 1, and the first buckle 70a is elastically connected to the switch housing 1 through the first buckle reset spring 71a; when the load circuit breaker is assembled, the first buckle reset spring 71a makes the first buckle 70a and the second buckle 70-1a respectively press against the two ends of the switch fixing plate, and respectively cooperate with the switch fixing plate to limit the position. The load circuit breaker of the present invention has a switch installation structure of the switch housing 1, which has a simple structure and is easy to operate, thereby realizing the rapid and reliable installation of the load circuit breaker. Furthermore, the first buckle 70a includes a first hook 702a, and the second buckle 70-1a includes a second hook. The first hook 702a and the first hook are arranged relative to each other, and respectively hook the two ends of the switch fixing plate.

[0083] Preferably, the first buckle 70a moves away from the switch fixing plate under the action of external force, thereby releasing the limiting fit with the switch fixing plate.

[0084] Preferably, Figure 8-12 As shown, the load-breaking switch of the present invention further includes an input terminal block 4i and a screw introduction structure 2a, the switch housing 1 includes a first side 1-0 and a second side 1-1 of the housing that are arranged opposite to each other, and the input terminal block 4i is arranged on the first side 1-0 of the housing; the screw introduction structure 2a is matched with the input terminal block 4i in a one-to-one manner, and the two ends of the screw introduction structure 2a are respectively arranged close to the first side 1-0 and the second side 1-1 of the housing; when the load-breaking switch is connected, the user conveys the busbar connection screws 21a from the second side 1-1 of the housing through the screw introduction structure 2a to the first side 1-0 of the housing, and fixes the input terminal block 4i and the incoming power busbar. The load circuit breaker of the present invention, when wiring, has the second side 1-1 of its shell facing the user, and the first side 1-0 of the shell facing the power incoming busbar. The space between the input wiring busbar 4i and the power incoming busbar is narrow, which is not conducive to user operation or the user cannot operate it. The screw introduction structure 2a is convenient for conveying the busbar connection screws 21a to the first side 1-0 of the shell to fix the input wiring busbar 4i and the power incoming busbar, which greatly facilitates the user's wiring operation.

[0085] Preferably, Fig.10 and 12As shown, the screw introduction structure 2a is a cylindrical structure, including an introduction structure body 20a and two annular grooves 200a respectively arranged at both ends of the introduction structure body 20a. The screw introduction structure 2a is limitedly matched with the switch housing 1 through the two annular grooves 200a. Fig.10 and 12 As shown, the first side wall 12-0 and the second side wall 12-1 of the switch housing 1 are both provided with a semi-support plate 14, each semi-support plate 14 is provided with a semi-circular limiting groove of the introduction structure, both ends of the screw introduction structure 2a are limited by the two semi-support plates 14, and each annular groove 200a is limited with the side wall of the two semi-circular limiting grooves of the introduction structure. The fixing structure of the screw introduction structure 2a is simple, and can reliably limit the screw introduction structure 2a, providing convenience for the wiring of the load circuit breaker, and also preventing the screw introduction structure 2a from being out of the limit and affecting the internal action of the load circuit breaker.

[0086] Preferably, Figure 8 and 21 As shown, each phase circuit further includes two fuse terminals 9 and a first insulating partition. The two fuse terminals of fuse 1a are respectively connected to the two fuse terminals 9, and a first insulating partition is provided between fuse 1a and fuse terminals 9. The first insulating partition prevents the fuse terminals from generating eddy currents or even conducting due to the close distance between the fuse terminals and the fuse, resulting in excessive local temperature rise and damage to fuse 1a, thereby ensuring the insulation and reliable insulation distance inside the load-breaking switch. Further, as Figure 6 As shown, the first insulating partition includes two first semi-insulating partitions 15 that match each other. The two first semi-insulating partitions 15 are respectively arranged on a pair of housing side walls of the switch housing 1. The connection between the two first semi-insulating partitions 15 is provided with a terminal avoidance groove through which the eutectic fuse terminal passes. The fuse terminal abuts against the bottom surface of the terminal avoidance groove. When the user installs the fuse 1a, the fuse 1a is inserted into the terminal avoidance groove and contacts the bottom surface of the terminal avoidance groove, which indicates that the fuse 1a has been installed in place, providing an indication for the installation of the fuse 1a. Further, as Fig.25 As shown, the switch housing 1 further comprises a fuse support plate for supporting the fuse 1a, and the fuse support plate comprises a semi-support plate 14 respectively arranged on a pair of side walls of the switch housing 1. Fig.25 As shown, two ends of each of the half support plates 14 are respectively connected to two first half insulating partitions 15 by bending, forming a U-shaped structure as a whole.

[0087] Preferably, Figure 21-24As shown, 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. The three output terminals are all arranged at one end of the switch housing 1. The first-phase output terminal 6-1a, the second-phase output terminal 6-2a and the third-phase output terminal 6-3a are sequentially arranged side by side and spaced apart and stacked along the height direction of the switch housing 1; a first insulating plate 18-1 is arranged between the first-phase output terminal 6-1a and the second-phase output terminal 6-2a, and a second insulating plate 18-2 is arranged between the second-phase output terminal 6-2a and the third-phase output terminal 6-3a. The load-break switch of the present invention has three output terminals arranged in a straight line and spaced apart and stacked, so that each output terminal can occupy a larger installation space in the thickness direction of the switch housing 1, so that the specifications of the output terminals can be increased, the current-carrying capacity is increased and the wiring operation is more convenient; and insulating plates are provided between adjacent output terminals, so as to improve the phase-to-phase insulation performance of the load-break switch. Further, as Fig. 22 and 24 As shown, the third phase output terminal 6-3a, the second phase output terminal 6-2a and the first phase output terminal 6-1a are offset in a direction away from the switch housing 1 in sequence. Fig. 22 and 24 As shown, the first phase output terminal 6-1a, the second phase output terminal 6-2a and the third phase output terminal 6-3a are arranged in sequence from bottom to top, forming a three-step structure as a whole. The three output terminals are arranged in the above manner, which is conducive to further increasing the spacing between the output terminals, thereby ensuring sufficient insulation gap and creepage distance.

[0088] like Figure 1-30 FIG. 1 is an embodiment of a load breaking switch according to the present invention.

[0089] like Figure 1 , 8 As shown in 21, the load circuit breaker of the present invention is preferably a three-phase load circuit breaker, comprising a switch housing 1, an operating mechanism 2 arranged in the switch housing 1, and three phase circuits, wherein the three phase circuits are arranged in parallel in the switch housing 1 in the axial direction of the switch housing 1, i.e., in the length direction; Figure 8 As shown, each of the phase circuits 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 and the arc extinguishing system cooperate one-to-one. The contact system includes a moving contact system and a static contact 8 that are used in conjunction with each other. The operating mechanism 2 cooperates with the moving contact system in driving. The operating mechanism 2 includes a power handle 20. The power handle 20 is moved to drive the moving contact system to move back and forth, so that the moving contact system and the static contact 8 are closed / disconnected, thereby realizing the closing / opening of the load circuit breaker.

[0090] Preferably, Figure 8 and 21As shown, each phase circuit includes a fuse 1a, two fuse terminals 9, two contact systems and an arc extinguishing system. The two fuse terminals of the fuse 1a are connected in series with the two contact systems through the two fuse terminals 9, and the contact system and the arc extinguishing system cooperate one-to-one. Fig.20a and 21 As shown, each group of the contact system includes a moving contact system and two static contacts 8 used in conjunction with each other, each group of the moving contact system includes a contact support 5 and two moving contact assemblies 6 arranged side by side installed on the contact support 5, the two static contacts 8 are respectively arranged at the two ends of the two moving contact assemblies 6, and respectively cooperate with the two ends of the two moving contact assemblies 6; each group of the arc extinguishing system includes two arc extinguishing chambers 7 arranged opposite to each other, the two arc extinguishing chambers 7 are respectively arranged on the outside of the two ends of the two moving contact assemblies 6, the length of the arc extinguishing chamber 7 in the length direction of the load circuit breaker switch meets the condition that the moving contact assembly is wrapped up and down by the arc extinguishing chamber regardless of whether it is in the open or closed state, so that the arc is completely extinguished inside the load circuit breaker through the arc extinguishing chamber 7, achieving zero arcing on the outer surface of the product and improving the product safety factor.

[0091] Preferably, the contact support 5 of each phase circuit is a linked split structure, or each phase circuit shares a contact support 5 of an integrated structure. Figure 8 and 21 As shown, each phase circuit of the load-breaking switch of the present invention preferably shares a contact support 5 of an integral structure.

[0092] The load-breaking switch of the present invention comprises two contact systems for each phase circuit, each contact system comprises a moving contact system and two stationary contacts 8, and each moving contact system comprises two moving contact assemblies 6, so that each phase circuit has four breaking point groups connected in series in sequence, and each breaking point group also comprises two breaking points connected in parallel, thereby reducing the current borne by each contact, effectively reducing the electric repulsion of the contacts, and greatly improving the current-carrying capacity, breaking capacity and rated operating voltage of the load-breaking switch.

[0093] Specifically, Fig.21In the direction shown, the three phase circuits are arranged side by side from left to right in sequence; the operating mechanism 2 is arranged at the left end of the switch housing 1, and each of the fuses 1a is provided with fuse terminals on both sides, respectively matched with two fuse terminal blocks 9 on both sides of the fuse 1a (respectively the left terminal block 9-1 located on the left side and the right terminal block 9-2 located on the right side); each of the fuse terminal blocks 9 is provided with a group of contact systems and a group of arc extinguishing systems below (the left terminal block 9-1 is provided with a left contact system and a left arc extinguishing system, and the right terminal block 9-2 is provided with a right contact system and a right arc extinguishing system); a static contact 8 is provided at the upper and lower ends of the left side of the two moving contact assemblies 6 of each group of the moving contact system, and two arc extinguishing chambers 7 are provided at the upper and lower ends of the two moving contact assemblies 6, respectively. Further, as Fig.21aAs shown, taking the leftmost phase circuit as an example: the fuse 1a is connected in series with the left and right contact systems (respectively the left contact system and the right contact system) through the left terminal block 9-1 and the right terminal block 9-2 respectively; the left contact system includes an upper left static contact 8-1 and a lower left static contact 8-2 arranged relatively to each other, and a left inner moving contact assembly 6-1 and a left outer moving contact assembly 6-2 arranged side by side; the upper left static contact 8-2 is connected to the left terminal block 9-1, and the lower left static contact 8-1 is connected to the input terminal board 4i; the upper ends of the left inner moving contact assembly 6-1 and the left outer moving contact assembly 6-2 are respectively matched with the upper left static contact 8-2, and the left inner moving contact assembly 6-1 and the left outer moving contact assembly 6-2 are connected to the upper left static contact 8-2. The lower ends cooperate with the lower left static contact 8-1 respectively, forming four breakpoints in total; the right contact system includes an upper right static contact 8-3 and a lower right static contact 8-4 arranged relatively to each other, and a right inner moving contact assembly 6-3 and a right outer moving contact assembly 6-4 arranged side by side; the upper right static contact 8-3 is connected to the right terminal block 9-2, and the lower right static contact 8-4 is connected to the output terminal board. The upper ends of the right inner moving contact assembly 6-3 and the right outer moving contact assembly 6-4 cooperate with the upper right static contact 8-3 respectively, and the lower ends of the right inner moving contact assembly 6-3 and the right outer moving contact assembly 6-4 cooperate with the lower right static contact 8-4 respectively, forming four breakpoints in total; it can be seen that there are two current paths in the leftmost phase circuit, namely: the first The first current path is input wiring board 4i (first input wiring board 4-1i) → lower left static contact 8-1 → left inner moving contact assembly 6-1 → upper left static contact 8-2 → left terminal block 9-1 → fuse 1a → right terminal block 9-2 → upper right static contact 8-3 → right inner moving contact assembly 6-3 → lower right static contact 8-4 → output wiring board (first output wiring board 5-1o), and the second current path is input wiring board 4i (first input wiring board 4-1i) → lower left static contact 8-1 → left outer moving contact assembly 6-2 → upper left static contact 8-2 → left terminal block 9-1 → fuse 1a → right terminal block 9-2 → upper right static contact 8-3 → right outer moving contact assembly 6-4 → lower right static contact 8-4 → output Output terminal block (first output terminal block 5-1o); two current paths are branched at the breakpoint and merged at the fuse 1a. Since the currents of each path are significantly reduced after the branching, the electric repulsion force generated when the load circuit breaker is opened is also reduced accordingly. Therefore, the load circuit breaker can adapt to the performance requirements of higher currents. After the branching, the temperature rise generated at each moving contact assembly 6 becomes smaller, and the heat generation is reduced. Therefore, it can adapt to a smaller shell space; moreover, four breakpoints are formed on each current path. Due to the series voltage division, the bearing voltage at each breakpoint is only 1 / 4 of the total voltage value. Therefore, the load circuit breaker of the present invention can achieve higher voltage disconnection, especially the reliable disconnection of voltages of 800V and above that cannot be achieved by existing products.

[0094] Preferably, Fig.21As shown, the fuse terminal block 9 is a U-shaped structure, including two terminal block clamping plates and a terminal block connecting plate arranged opposite to each other, and the two ends of the terminal block connecting plate are respectively connected to the two terminal block clamping plates by bending. Fig.21 As shown, the free end of the terminal block clamp is divided into two half-terminal block clamps arranged side by side and at intervals; the phase circuit also includes a spring coil, and both ends of each spring coil are arranged on both sides of a pair of oppositely arranged half-terminal block clamps to ensure reliable contact between the fuse terminal block 9 and the fuse terminal of the fuse 1a.

[0095] Preferably, Fig.20a As shown, the stationary contact 8 includes a stationary contact terminal plate 80, a stationary contact connecting plate 81 and two stationary contact contact plates 82. One end of the stationary contact connecting plate 81 is bent and connected to the stationary contact terminal plate 80, and the other end is provided with two stationary contact plates 82 arranged side by side and spaced apart. The two stationary contact plates 82 respectively cooperate with one end of the two moving contact assemblies 6.

[0096] like Figure 9-10 , 13-18, the load-breaking switch of the present invention has improved the moving contact system, specifically as follows:

[0097] Preferably, Fig. 9 and 10 As shown, the load-breaking switch of the present invention includes a first guide limit structure, and the contact support 5 cooperates with the switch housing 1 through the first guide limit structure; the first guide limit structure includes a rolling device and a rolling track for use. Fig. 9 and 10 As shown, the contact support 5 includes a contact support body 50 and a rolling device arranged on the contact support body 50 and matched with the switch housing 1; the switch housing 1 includes a rolling track matched with the rolling device. Fig.10 As shown, the rolling device includes a rolling bearing 51, and the contact support body 50 includes a bearing installation shaft 501 for installing the rolling bearing 51; the switch housing 1 also includes a rolling track that cooperates with the rolling bearing 51. Figure 1 and 5 As shown, the switch housing 1 includes a housing body 12, the housing body 12 includes two housing side walls arranged opposite to each other, namely, a first side wall 12-0 and a second side wall 12-1, the contact support 5 is located between the first side wall 12-0 and the second side wall 12-1, each housing side wall includes a rolling track matched with a rolling bearing 51; the contact support 5 includes at least two rolling devices, which are respectively arranged on two sides of the contact support 5 opposite to the two housing side walls. Further, as Fig. 9 , 11As shown in 13, the contact support 5 includes two groups of rolling devices respectively arranged at its two ends, and each group of rolling devices includes two rolling devices arranged at a relative interval; the two rolling devices of each group of rolling devices are respectively arranged on both sides of the contact support 5, and respectively cooperate with the first side wall 12-0 and the second side wall 12-1.

[0098] Specifically, Fig. 9 , 11 As shown in FIG. 13 , the contact support 5 includes a contact support first side wall opposite to the first side wall 12 - 0 and a contact support second side wall opposite to the second side wall 12 - 1 , a rolling device is provided at each end of the contact support first side wall, and a rolling device is provided at each end of the contact support second side wall.

[0099] Preferably, Fig. 9 and 10 As shown, the extension direction of the bearing installation shaft 501 is perpendicular to the side wall of the housing.

[0100] Preferably, Figure 13-18 As shown, the moving contact assembly 6 includes two moving contacts 61 arranged at a relative interval, two moving contact spring pieces 62 arranged at a relative interval, and a contact assembly shaft 60, the two moving contact spring pieces 62 are respectively arranged on both sides of the two moving contacts 61, and the two ends of each moving contact spring piece 62 are respectively pressed against the two ends of a moving contact 61, and the contact assembly shaft 60 is arranged in the middle of the moving contact assembly 6 and passes through the moving contact 61 and the moving contact spring piece 62 respectively; the contact support 5 includes a contact assembly hole 502, a contact assembly crossbeam 5020 is provided in the middle of the contact assembly hole 502, and a contact assembly shaft groove 5021 is provided in the middle of the contact assembly crossbeam 5020; the moving contact assembly 6 is inserted into the contact assembly hole 502 and the two ends protrude on both sides of the contact support 5, the contact assembly shaft 60 is in the contact assembly groove 5021, and the two moving contacts 61 are respectively located on both sides of the contact assembly crossbeam 5020 and are limitedly matched with the contact assembly crossbeam 5020. Further, such as Fig.18 As shown, the moving contact assembly 6 also includes a moving contact positioning sleeve 63, which is sleeved on the contact assembly shaft 60, located between the two moving contacts 61 and respectively limitedly engaged with the two moving contacts 61; the moving contact positioning sleeve 63 is placed in the contact assembly shaft groove 5021.

[0101] Preferably, the contact assembly shaft 60 is a rivet, which rivets the two moving contacts 61, the two moving contact spring pieces 62, and the moving contact positioning sleeve 63 together; Fig.18 As shown, the moving contact spring piece 62 is a bow-shaped structure.

[0102] Preferably, Fig.18As shown, two moving contacts 613 are provided at both ends of each of the moving contacts 61. The two moving contacts 613 arranged at the same end of the moving contact 61 are arranged side by side and spaced apart along the width direction of the moving contact 61. One end of the two moving contacts 61 loads both sides of the static contact contact plate 82 of the static contact 8. The two static contact contact plates 82 are in contact with the two moving contacts 613 respectively, realizing multi-point contact and improving the reliability of the contact between the moving contact assembly 6 and the static contact 8.

[0103] Preferably, Fig.18 As shown, a moving contact matching groove 612 is respectively provided at both ends of the moving contact 61, which matches with the two ends of the spring piece 62 to limit the moving contact 61 and the moving contact spring piece 62 so that the moving contact 61 and the moving contact spring piece 62 can be reliably limited.

[0104] Preferably, Figure 17-18 As shown, the moving contact 61 includes a moving contact groove 611 arranged in the middle thereof, and the two moving contact grooves 611 of the two moving contacts 61 of the moving contact assembly 6 protrude in opposite directions respectively, and the spacing between the bottom surfaces of the two moving contact grooves 611 matches the thickness of the contact assembly crossbeam 5020, and the spacing between the ends of the two moving contacts 61 is smaller than the thickness of the contact assembly crossbeam 5020. Further, as Fig.14 , 16 As shown in FIG. 17 , the two side edges along the thickness direction of the two ends of the contact assembly beam 5020 are both provided with chamfered structures, so that the cross section of the contact assembly beam 5020 is a shuttle-shaped structure, and when the moving contact assembly 6 is inserted into the contact assembly hole 502, it is convenient for the contact assembly beam 5020 to squeeze in between the two moving contacts 61. Further, as Fig.17 As shown, the lengths of the parts of the moving contact assembly 6 protruding from both sides of the contact support 5 are the same; the two moving contact grooves 611 relatively form a space with a shuttle-shaped cross-section, and the shape of the space matches the shape of the contact assembly beam 5020.

[0105] Preferably, Fig.14 , 16 -18, in the moving contact assembly 6, at least one moving contact 61 is provided with a moving contact limiting groove 610, and the contact assembly cross beam 5020 is provided with a contact limiting protrusion 5022; the contact assembly shaft 60 and the contact assembly cross beam 5020 are limited and matched to prevent the moving contact assembly 6 from escaping from one end of the contact assembly hole 502, and the contact limiting protrusion 5022 is limited and matched with the contact limiting groove 610 to prevent the moving contact assembly 6 from escaping from the other end of the contact assembly hole 502. Further, the two moving contacts 61 of the moving contact assembly 6 are both provided with a moving contact limiting groove 610, and the two contact assembly cross beams 5020 are each provided with a contact limiting protrusion 5022, which are respectively limited and matched with the two moving contact limiting grooves 610. Specifically, as Fig.18As shown, the moving contact groove 611 of the moving contact 61 is a groove with an isosceles trapezoidal structure in cross section, including a groove bottom surface and two groove side walls, the two groove side walls are respectively connected to the two ends of the groove bottom surface at obtuse angles, and a moving contact limiting groove 610 is provided on one of the groove side walls, and the cross section of the moving contact limiting groove 610 is a wedge-shaped structure; Fig.16 As shown, the two side edges along the thickness direction of the contact assembly cross beam 5020 at both ends are provided with chamfer structures to form four chamfered inclined surfaces. The two chamfered inclined surfaces at one end of the contact assembly cross beam 5020 are each provided with a contact limiting protrusion 5022, and the cross section of the contact limiting protrusion is a wedge-shaped structure. Figure 13-16 As shown, the contact assembly shaft groove 5021 and the contact limiting protrusion 5022 are respectively located at two ends of the contact assembly crossbeam 5020.

[0106] Preferably, Figure 13-16 As shown, the contact support 5 includes a plurality of groups of moving contact assembly holes 502, each group of moving contact assembly holes 502 includes two moving contact assembly holes 502 arranged side by side and spaced apart along the contact support 5 in the transverse direction, and the plurality of groups of moving contact assembly holes 502 are arranged spaced apart in sequence along the axial direction of the contact support 5. Specifically, as Fig.13 and 15 As shown, the contact support 5 is provided with three groups of moving contact assembly holes 502. Further, as Figure 13-16 As shown, the contact support 5 also includes a moving contact enclosure 503 of an E-shaped structure, and moving contact enclosures 503 are provided on the outer sides of both ends of each group of contact assembly holes 502, and the opening end of the E-shaped structure of each moving contact enclosure 503 faces the stationary contact 8 matched with the moving contact assembly 6. Specifically, as Fig.14 As shown, the E-shaped movable contact enclosure 503 includes two enclosure spaces arranged side by side and spaced apart, respectively cooperating with two contact assembly holes 502 of the same group. The E-shaped movable contact enclosure 503 increases the insulation performance between two adjacent groups of movable contact assemblies 6.

[0107] Preferably, Fig.10 As shown, 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 both sides of the contact support 5; the operating mechanism 2 also includes an operating mechanism connecting rod 21, and the operating mechanism connecting rod 21 includes two operating mechanism connecting plates arranged opposite to each other, which are respectively inserted into the two contact support connection grooves and fixedly connected to the contact support 5 through the first fixing pin 21-50. Specifically, the operating mechanism 2 is drivingly connected to the contact support 5, and the operating mechanism 2 drives the entire moving contact system to reciprocate through the contact support 5 to close / open the load-breaking switch.

[0108] like Figure 19-20cAs shown, the load-breaking switch of the present invention further improves the arc extinguishing chamber 7, specifically as follows:

[0109] Preferably, Fig.19 and 20b As shown, the arc extinguishing chamber 7 comprises two arc extinguishing chamber side walls 70 arranged relatively spaced apart and an arc extinguishing grid group arranged between the two arc extinguishing chamber side walls 70, the arc extinguishing grid group comprises a plurality of arc extinguishing grids 72 arranged between the two arc extinguishing chamber side walls 70; the arc extinguishing grid 72 comprises two arc guiding semicircular grooves 702 arranged side by side spaced apart on one end thereof located at the entrance end of the arc extinguishing chamber. Further, as Fig.20c As shown, the arc extinguishing chamber also includes multiple groups of grid assembly grooves 700, each group of grid assembly grooves 700 includes two grid assembly grooves 700 respectively arranged on two arc extinguishing chamber side walls 70, and at least one grid assembly groove 700 in each group of grid assembly grooves 700 is provided with a grid clamping platform 701 at its insertion end.

[0110] Preferably, the arc extinguishing grid 72 is located at one end of the arc extinguishing chamber entrance, a grid straight section is provided between the two arc guiding semicircular grooves 702, and both side ends of the two arc guiding semicircular grooves 702 are flush with the grid straight section.

[0111] Preferably, the inlet ends of the two grid assembly grooves 700 of each group of grid assembly grooves 700 are provided with grid clamping platforms 701; and both sides of one end of the arc extinguishing grid 72 located at the outlet of the arc extinguishing chamber are provided with grid clamping grooves matching with the grid clamping platforms 701.

[0112] Preferably, the grid assembly groove 700 is arranged at an angle, and a guide slope is provided at the entrance of the grid assembly groove 700 to facilitate the insertion of the arc-extinguishing grid 72 .

[0113] Preferably, Fig.20b As shown, the arc extinguishing chamber further includes a connecting plate 71, and the two ends of the two arc extinguishing chamber side walls 70 are connected by two connecting plates 71. Fig.20b As shown, one end of one of the connecting plates 71 located at the entrance of the arc extinguishing chamber is provided with a connecting plate hook 725 bent outward, and the connecting plate hook 725 is located between the two arc-guiding semicircular grooves 702. Fig.20b As shown, the connecting plate 71 located at the right end of the arc extinguishing chamber 7 is provided with a connecting plate hook 725.

[0114] Specifically, Fig.20bIn the direction shown, the two arc extinguishing chamber side walls 70 are arranged with an interval up and down relative to each other, and the left and right ends of the two arc extinguishing chamber side walls 70 are connected by a connecting plate 71 respectively; the grid assembly groove 700 extends from the back to the front and tilts to the left, and the rear end (entrance end) of the grid assembly groove 700 is provided with a grid clamping platform 701 and a guide slope; the rear end (located at the end of the arc extinguishing chamber 7 outlet) of the arc extinguishing grid 72 is provided with a grid clamping groove, and the front end (located at the end of the arc extinguishing chamber 7 entrance) is provided with two arc guiding semicircular grooves 702 arranged side by side and at intervals, and the arc guiding semicircular grooves 702 of multiple arc extinguishing grids 72 constitute two parallel and side-by-side arc guiding semicircular grooves of the arc extinguishing chamber grid group.

[0115] like Fig.20a The figure shows an embodiment of the coordination between the arc extinguishing system and the contact system.

[0116] like Fig.20a As shown, the two arc extinguishing chambers 7 are used as an arc extinguishing system in conjunction with a contact system. The two arc extinguishing chambers 7 are respectively arranged above and below the two moving contact assemblies 6 arranged side by side. The two arc guiding semicircular grooves of each arc extinguishing chamber 7 are respectively matched with the two moving contact assemblies 6. The two static contacts 8 are arranged opposite to each other up and down and are both located on the same side of the two moving contact assemblies 6, respectively matched with the upper end and the lower end of the two moving contact assemblies 6. Each static contact 8 includes two static contact plates 82 arranged side by side, which are respectively matched with the two moving contact assemblies 6.

[0117] like Fig.11 , 21 -23, the load circuit breaker of the present invention also improves the arrangement of the output end, as follows:

[0118] Preferably, Fig.11 , 22 As shown in Figures 23 and 24, the load-breaking switch of the present invention includes three output terminals, namely, the first phase output terminal 6-1a, the second phase output terminal 6-2a and the third phase output terminal 6-3a; the three output terminals are all arranged at one end of the switch housing 1, and the first phase output terminal 6-1a, the second phase output terminal 6-2a and the third phase output terminal 6-3a are arranged in parallel and stacked in sequence along the height direction of the switch housing 1; a first insulating plate 18-1 is arranged between the first output terminal 6-1a and the second output terminal 6-2a, and a second insulating plate 18-2 is arranged between the second output terminal 6-2a and the third output terminal 6-3a. Further, as Fig. 22 As shown, the third phase output end 6 - 3a , the second phase output end 6 - 2a and the first phase output end 6 - 1a are offset in sequence along the length direction of the switch housing 1 in a direction away from the switch housing 1 .

[0119] Preferably, Fig.11As shown, the first insulating plate 18 - 1 and the second insulating plate 18 - 2 are arranged in parallel and spaced apart, and one end of each of the insulating plates is respectively connected to the switch housing 1 in a limiting manner.

[0120] Specifically, Fig. 22 As shown, the first phase output terminal 6-1a, the second phase output terminal 6-2a and the third phase output terminal 6-3a are arranged in sequence from bottom to top, forming a three-level stepped structure as a whole. Fig. 22 As shown, the first phase output terminal 6 - 1 a , the second phase output terminal 6 - 2 a and the third phase output terminal 6 - 3 a are shifted to the right in sequence.

[0121] Preferably, Fig.21 As shown, the load-breaking switch of the present invention has three phase circuits distributed in sequence along the axial direction of the switch housing 1, namely the first phase circuit, the second phase circuit and the third phase circuit; the first phase circuit includes a first output terminal board 5-1o, the second phase circuit includes a second output terminal board 5-2o, and the third phase circuit includes a third output terminal board 5-3o; one end of the first output terminal board 5-1o is connected to the first output terminal 6-1a, one end of the second output terminal board 5-2o is connected to the second phase output terminal 6-2a, and one end of the third output terminal board 5-3o is connected to the third phase output terminal 6-3a. Further, as Fig.21 As shown, the first output wiring board 5-1o and the second output wiring board 5-2o are arranged opposite to each other, and the third output wiring board 5-3o is located between the first output wiring board 5-1o and the second output wiring board 5-2o.

[0122] Specifically, Fig.21As shown, the first output terminal block 5-1o includes a first output terminal block body and a first output inner connecting plate and a first output outer connecting plate respectively arranged at both ends of the first output terminal block body, the first output inner connecting plate and the first output outer connecting plate are respectively connected to the first output terminal block body by bending and are both located on the same side of the first output terminal block body, and the first output outer connecting plate is connected to the first phase output terminal 6-1a; the second output terminal block 5-2o includes a second output terminal block body and a second output inner connecting plate and a second output outer connecting plate respectively arranged at both ends of the second output terminal block body, the second output inner connecting plate and the second output outer connecting plate are respectively connected to the second output terminal block body by bending and are both located on the same side of the second output terminal block body, and the second output outer connecting plate is connected to the second phase output terminal 6-2a; the third output terminal block 5-3 o includes a third output wiring board body and a third output inner connecting plate and a third output outer connecting plate respectively arranged at both ends of the third output wiring board body, the third output inner connecting plate and the third output outer connecting plate are respectively connected to the third output wiring board body by bending and are respectively located on both sides of the third output wiring board body, and the third output outer connecting plate is connected to the third phase output terminal 6-3a; 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 body and the second output wiring board body, the first output wiring board body and the second output wiring board body are arranged in parallel and spaced apart, and the third output wiring board body is located between the first output wiring board body and the second output wiring board body and is perpendicular to the first output wiring board body and the second output wiring board body. Further, as Fig.21 As shown, the first output external connection plate, the second output external connection plate and the third output external connection plate are sequentially arranged side by side and spaced apart in the height direction of the switch housing 1; the first output external connection plate, the second output external connection plate and the third output external connection plate are sequentially arranged side by side and spaced apart in the axial direction of the switch housing 1.

[0123] Preferably, Figure 1 As shown, the switch housing 1 further includes a bottom cover 17, the cover body 11, the housing body 12 and the bottom cover 17 are arranged in sequence, and the cover body 11 and the bottom cover 17 are respectively matched with the two ends of the housing body 12 in the height direction. Figure 1 , 21 As shown in 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, the first output terminal block 5-1o, the second output terminal block 5-2o and the third output terminal block 5-3o are all arranged on the bottom cover 17; the three output terminals and the operating mechanism 2 are respectively located at the two ends of the switch housing 1.

[0124] like Figure 26-31As shown, the load-breaking switch of the present invention also improves the switch installation structure, as follows:

[0125] Preferably, Fig.26 , 28 , 30, is a first embodiment of the switch installation structure, which is specifically as follows: the switch housing 1 includes a switch installation structure, and the switch installation structure includes a first buckle 70a, a first buckle reset spring 71a, and a second buckle 70-1a respectively arranged at two ends of the bottom of the switch housing 1; the first buckle 70a is slidably arranged on the switch housing 1, and the first buckle 70a is elastically connected to the switch housing 1 through the first buckle reset spring 71a; when the load-breaking switch is assembled, the first buckle reset spring 71a makes the first buckle 70a and the second buckle 70-1a respectively press against the two ends of the switch fixing plate and respectively cooperate with the switch fixing plate in a limiting manner. Further, as Fig.30 As shown, the first buckle 70a moves away from the switch fixing plate under the action of external force, releasing the limit fit with the switch fixing plate. Fig.30 In the direction shown, the first buckle 70a moves upward under the action of external force, which can release the limiting cooperation between the first buckle 70a and the switch mounting plate.

[0126] Preferably, Fig.26 , 28 As shown in FIG. 30 , the first buckle 70a includes a first hook 702a, and the second buckle 70-1a includes a second hook. The first hook 702a and the second hook are arranged opposite to each other and hook the two ends of the switch fixing plate respectively. Fig.30 As shown, the switch fixing plate includes a first fixing plate 8-1a and a second fixing plate 8-2a arranged in parallel and spaced apart, and respectively cooperate with the first buckle 70a and the second buckle 70-1a to limit the position.

[0127] Preferably, Fig. 27 and 29 As shown, an implementation manner of the first buckle 70a and the matching relationship between the first buckle 70a and the switch housing 1 is shown.

[0128] like Fig. 27 and 29 As shown, the first buckle 70a includes a first buckle 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 arranged on both sides of the first buckle body 701a; Fig. 27 and 29As shown, the switch housing 1a also includes a first buckle mounting structure, which includes a first slide groove 720a and a buckle spring assembly groove 721a. The buckle spring assembly groove 721a is arranged at one end of the bottom wall of the first slide groove 720a. The first buckle body 701a is slidably arranged in the first slide groove 720a. The first buckle spring limiting portion 703a is placed in the buckle spring assembly groove 721a. The first buckle reset spring 71a is arranged in the buckle spring assembly groove 721a, and the two ends are respectively limited and matched with the side wall of the buckle spring assembly groove 721a and the first buckle spring limiting portion 703a. Further, as Fig. 27 and 29 As shown, the first buckle body 701a also includes a buckle reset spring loading hole 7012a, a first buckle front avoidance groove 7010a and a first buckle rear avoidance groove 7011a, the buckle reset spring loading hole 7012a is arranged in the middle of the first buckle body 701a, the two first buckle front avoidance grooves 7010a are respectively arranged on the two side edges of one end of the first buckle body 701a, and the two first buckle rear avoidance grooves 7011a are respectively arranged on the two side edges of the other end of the first buckle body 701a; Fig. 27 and 29 As shown, a first buckle insertion hole 7200a is provided on one side of the first slide groove 720a, and a first buckle front positioning boss 722a is provided on both sides of one end of the first buckle insertion hole 7200a, and a first buckle rear positioning boss 723a is provided on both sides of the other end; when the first buckle 70a is installed in the first buckle installation structure, the first buckle body 701a is located on one side of the first buckle insertion hole 720a, and the two first buckle front avoidance grooves 7010a are respectively connected to the two first buckle front positioning bosses. The boss 722a corresponds, the two first buckle rear avoidance grooves 7011a correspond to the two first buckle rear positioning bosses 723a respectively, the first buckle spring limiting portion 703a corresponds to the buckle spring assembly groove 721a, the first buckle 70a is placed into the first slide groove 720a, and then the first buckle 70a is slid in the direction of the buckle spring assembly groove 721a, and the first buckle reset spring 71a is installed in the buckle spring assembly groove 721a through the buckle reset spring installation hole 7012a.

[0129] Preferably, Fig. 27 As shown, a snap spring assembly groove partition plate 7210a extending axially thereof is provided in the middle portion of the snap spring assembly groove 721a, and the length of the snap spring assembly groove partition plate 7210a is smaller than the length of the snap spring assembly groove 721a, and two first snap reset springs 71a are arranged side by side in the snap spring assembly groove 721a and are respectively located on both sides of the snap spring assembly groove partition plate 7210a.

[0130] Preferably, Fig.29As shown, the first buckle 70a also includes a first buckle unlocking portion 700a, and a first buckle spring limiting portion 703a are respectively located at both ends of the first buckle 70a, and a first buckle unlocking operating hole 7000a is provided on the first buckle unlocking portion 700a. External force drives the first buckle 70a away from the switch fixing plate through the first buckle unlocking operating hole 7000a.

[0131] Preferably, Fig.26 and 28 As shown, an implementation manner of the second buckle 70 - 1 a and the matching relationship between the second buckle 70 - 1 a and the switch housing 1 is shown.

[0132] like Fig.26 and 28 As shown, the second buckle 70-1a is fixedly arranged on the switch housing 1, and comprises a second buckle body and a second hook, the second hook is arranged on one side of the first buckle body, and the second buckle body is fixedly connected to the switch housing 1 by means of mounting screws. Of course, the second buckle 70-1a can also adopt the same structure as the first buckle 70a, and can also play the role of installing the load break switch, but it will make the structure of the switch installation structure complicated.

[0133] Specifically, Figure 8 , 26 As shown, the switch mounting structure and the input terminal block 4i are both arranged on the first side 1-0 of the housing, the first clip 70a and the second clip 70-1a are respectively arranged at the two ends of the first side 1-0 of the housing, and the three input terminal blocks 4i are arranged side by side and spaced apart in sequence between the first clip 70a and the second clip 70-1a.

[0134] like Fig.31 As shown, another embodiment of the switch installation structure is as follows: the first buckle 70a includes a first hook 702a, the second buckle 70-1a includes a second hook, the first hook 702a and the second hook face the same direction; the switch fixing plate includes a first fixing plate 8-1a and a second fixing plate 8-2a arranged parallel to each other, and the first hook 702a and the second hook are hung on the first fixing plate 8-1a and the second fixing plate 8-2a respectively. The switch installation structure of this embodiment can realize the rapid mounting and disassembly of the load-breaking switch.

[0135] like Figure 1-7 As shown, an important innovation of the load-breaking switch of the present invention is that it includes a first locking mechanism 3, which is as follows:

[0136] like Figure 1 As shown, the switch housing 1 includes a cover 11 and a housing body 12, the cover 11 is arranged on one side of the housing body 12 to cooperate with it; the first locking mechanism 3 is driven and cooperated with the power handle 20 of the operating mechanism 2; Figure 2 and 3 As shown, when the power handle 20 is moved to close the load circuit breaker, the first locking mechanism 3 moves to lock with the cover body 11 to prevent the cover body 11 from being opened. When the power handle 20 is moved to open the load circuit breaker, the power handle 20 drives the first locking mechanism 3 to release the locking cooperation with the cover body 11.

[0137] Preferably, the first locking mechanism 3 and the moving direction of the moving contact system are parallel to each other.

[0138] Preferably, Figure 2 and 3 As shown, one end of the cover 11 is hinged to one end of the housing body 12, and the other end of the cover 11 is limitedly matched with the other end of the housing body 12. When the cover 11 is opened, the cover 11 rotates relative to the housing body 12. Specifically, as Figure 2 and 3 As shown, the upper end of the cover body 11 is hinged to the upper end of the shell body 12.

[0139] Preferably, Figure 2 and 3 As shown, the first locking mechanism 3 includes a first locking mechanism body 30 and at least one first locking hook 31 arranged on the first locking mechanism body 30, the first locking mechanism body 30 is driven and cooperated with the power handle 20 and is limited and cooperated with the shell body 20; the cover body 11 includes at least one first locking buckle 11-10; when the power handle 20 is turned to close the load circuit breaker, the power handle 20 drives the first locking mechanism body 30 to drive the first locking hook 31 to move toward the first locking buckle 11-10, so that the first locking hook 31 is locked and cooperated with the first locking buckle 11-10; when the power handle 20 is turned to open the load circuit breaker, the first locking mechanism body 30 is reset and drives the first locking hook 31 away from the first locking buckle 11-10, so that the first locking hook 31 is released from the locking cooperation with the first locking buckle 11-10.

[0140] Preferably, Figure 2 and 3 As shown, the first locking buckle 11 - 10 includes a first locking groove, and the first locking hook 31 is locked and matched with the first locking groove.

[0141] Preferably, Figure 3 , 5 As shown in FIG. 7 , the first locking mechanism 3 further includes a first reset spring 3a. When the power handle 20 is turned to close the load circuit breaker, the first reset spring 3a drives the first locking mechanism 3 to reset so that it is locked with the cover 11. Further, as Figure 2 and 3As shown, the power handle 20 and the first return spring 3a are respectively arranged at both ends of the first locking mechanism body 30, and are respectively driven and matched with the two ends of the first locking mechanism body 30. Figure 7 As shown, the first locking mechanism 3 also includes a first spring limiting plate 32 arranged at one end of the first locking mechanism body 30, and the first spring limiting plate 32 is provided with a first spring limiting column. One end of the first return spring 3a is sleeved on the first spring limiting column, and the other end is limitedly matched with the switch housing 1.

[0142] Preferably, Figure 5 and 6 As shown, the housing body 12 includes a first track groove, and the first locking mechanism body 30 is slidably disposed in the first track groove. Figure 5 and 6 As shown, the housing body 12 includes a first side wall 12-0 and a second side wall 12-1 that are arranged opposite to each other, and the first track groove is located between the first side wall 12-0 and the second side wall 12-1, and its extension direction is parallel to the moving direction of the moving contact system. Figure 5 and 6 As shown, a plurality of first semi-insulating partitions 15 and a plurality of second semi-insulating partitions 13 are provided on the inner side of the second side wall 12-1, and the first semi-insulating partitions 15 and the second semi-insulating partitions 13 are both vertically connected to the second side wall 12-1, and a first limiting groove of a locking mechanism is provided at the connection between the first semi-insulating partition 15 and the second side wall 12-1, and a second limiting groove of a locking mechanism is provided at the connection between the second semi-insulating partition 13 and the second side wall 12-1, and a plurality of first limiting grooves of the locking mechanism and a plurality of second limiting grooves of the locking mechanism cooperate to form a first track groove for limiting and guiding the first locking mechanism 3.

[0143] Specifically, Figure 3 In the direction shown, when the power handle 20 is pushed to the left to open the load circuit breaker, 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 cooperation with the first locking buckle 11-10 is released; Figure 2 In the direction shown, when the power handle 20 is pushed to the right to close the load circuit breaker, the first reset spring 3a applies a thrust to the first locking mechanism 3, causing the first locking mechanism 3 to move to the right, driving the first locking hook 31 to enter the first locking groove of the first locking buckle 11-10, and the two are locked together.

[0144] Preferably, Figure 2 and 3As shown, the cover 11 includes a cover body 11-0 and at least one transparent cover 11-1 disposed on the cover body 11-0, the transparent cover 11-1 is snap-fitted with the cover body 11-0, and the cover 11-0 includes a first locking buckle 11-10. Fig. 9 As shown, the cover body 11-0 includes a cover mounting hole 11-01 disposed thereon for mounting a transparent cover 11-1; Figure 4 As shown, the transparent cover 11-1 includes a cover body 11-11 and a cover hook 11-12 arranged at one end of the cover body 11-11, one end of the cover body 11-11 is limitedly matched with one end of the cover mounting hole 11-01, and the cover hook 11-12 at the other end of the cover body 11-11 is snap-fitted with the other end of the cover mounting hole 11-01. Figure 4 As shown, the cover hook 11-12 is a U-shaped hook, one end of the U-shaped structure is connected to the cover body 11-11, and the other end is limited to the cover mounting hole 11-01. Of course, the cover hook 11-12 is not limited to the above structure, as long as the structure can achieve reliable installation and limit of the transparent cover 11-1 and the cover body 11-0, it belongs to the protection scope of this application.

[0145] Preferably, Fig.25 As shown, the transparent cover 11-1 also includes voltage detection holes 11-14 arranged at intervals, which respectively correspond to two fuse voltage detection ends of a fuse 1a, and the two fuse voltage detection ends are respectively connected to the two fuse connection terminals of the fuse 1a.

[0146] Specifically, Figure 1 , 5 As shown, the cover body 11 includes three transparent surface covers 11-1, which respectively correspond to the fuses 1a of the three phase circuits of the load-breaking switch of the present invention; the first locking mechanism 3 includes three first locking hooks 31 axially arranged along the first locking mechanism body 30, which respectively lock and cooperate with the first locking buckles 11-10 of the three transparent surface covers 11-1.

[0147] like Figure 8-12 As shown, another important innovation of the load-break switch of the present invention is that it includes a second locking mechanism 4, which is as follows:

[0148] like Figure 8 and 9As shown, the second locking mechanism 4 is driven to cooperate with the cover 11. When the cover 11 is opened, the second locking mechanism 4 moves to cooperate with the contact support 5 to prevent the moving contact system from moving. When the cover 11 is closed, the second locking mechanism 4 is driven to release the cooperation with the contact support 5. It should be pointed out that the above-mentioned opening or closing of the cover 11 includes the case where the cover 11 is opened or closed as a whole, and the case where the transparent panel 11-1 on the cover 11 is opened or closed.

[0149] Preferably, Figure 8 As shown, the moving directions of the second locking mechanism 4 and the moving contact system are perpendicular to each other.

[0150] Preferably, Fig.11 and 12 As shown, the second locking mechanism 4 includes a second locking mechanism body 40 and a second locking boss 41 arranged on one side of the second locking mechanism body 40, and the second locking mechanism body 40 is slidably matched with the shell body 12; the contact support 5 includes a contact support locking groove 52 arranged on one side thereof; when the cover body 11 is opened, the second locking mechanism body 40 is actuated and drives the second locking boss 41 to enter the contact support locking groove 52 and cooperate with it in a limiting manner to prevent the moving contact system from moving; when the cover body 11 is closed, the cover body 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 groove 52, so that the second locking mechanism 4 releases the limiting cooperation with the contact support 5.

[0151] Preferably, Figure 8 and 10 As shown, the second locking mechanism 4 also includes a second locking spring 4a; 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 support locking groove 52 and cooperate with it to prevent the moving contact system from moving. Figure 8 and 10 As shown, the second locking spring 4 a and the cover body 11 are respectively located at two ends of the first locking mechanism 4 .

[0152] Specifically, Fig.10As shown, the second locking mechanism body 40 is an L-shaped structure, including a main body sliding plate 401 and a main body actuated plate 402 that are bent and connected, the second locking boss 41 is arranged on the side of the main body sliding plate 401 facing the contact support 5, the main body actuated plate 402 is limitedly matched with one end of the second locking spring 4a, and when the cover 11 is opened, the second locking spring 4a causes the main body actuated plate 402 to press against the contact support 5 and limitly match it. Further, a sliding plate track structure that cooperates with the main body sliding plate 401 is provided on the shell side wall of the shell body 12, which limits and guides the main body sliding plate 401, so that the main body sliding plate 401 can only slide vertically relative to the contact support 5.

[0153] Preferably, Figure 8 and 9 As shown, the cover 11 also includes a cover driving boss 11-13 drivingly matched with the second locking mechanism 4; when the cover 11 is closed, the cover driving boss 11-13 drives the second locking mechanism 4 to move, so that the second locking mechanism 4 releases the limited matching with the contact support 5. Figure 8 As shown, the transparent cover 11-1 of the cover body 11 includes a cover body driving boss 11-13. Figure 8 and 9 As shown, the cover body 11 includes three transparent surface covers 11 - 1 , and the three transparent surface covers 11 - 1 are respectively driven to cooperate with three second locking mechanisms 4 .

[0154] Specifically, Figure 8 In the direction shown, when the transparent cover 11-1 is opened, the corresponding second locking mechanism 4 moves to the left under the push of the second locking spring 4a, so that the second locking boss 41 enters the contact support locking groove 52, and the second locking mechanism 4 cooperates with the contact support 5 to prevent the moving contact system from moving, and the load-breaking switch cannot be closed; when the transparent cover 11 is closed, its cover driving boss 11-13 presses the corresponding second locking mechanism 4 to move it to the right, so that the second locking boss 41 moves out of the contact support locking groove 52, and the second locking mechanism 4 releases the limited cooperation with the contact support 5. When the cover 11 is opened as a whole, the three second locking mechanisms 4 all move to the left and cooperate with the contact support 5 to limit the contact support 5, the contact support 5 is locked, and the load-breaking switch cannot be closed.

[0155] like Figure 5 , 6 As shown in FIGS. 24 and 25, another important innovation of the load-breaking switch of the present invention is that it includes a first insulating partition, which is as follows:

[0156] like Figure 5 and 6 As shown, a first insulating partition is provided between the fuse 1a and the fuse terminal block 9. Figure 5 and 6 As shown, the first insulating partition includes two first semi-insulating partitions 15 arranged opposite to each other, and the two first semi-insulating partitions 15 are respectively arranged on a pair of shell side walls of the switch shell 1, and a terminal avoidance groove is provided at the connection of the two first semi-insulating partitions 15 for the fuse terminal of the fuse 1a to pass through, and the fuse terminal rests on the bottom surface of the terminal avoidance groove.

[0157] Preferably, Fig.24 and 25 As shown, the switch housing 1 further comprises a fuse support plate for supporting the fuse 1a, and the fuse support plate comprises two half support plates 14 respectively arranged on a pair of side walls of the switch housing 1. Fig.25 As shown, the two ends of each of the half support plates 14 are respectively connected to the two first half insulating partitions 15 by bending, and the whole is in a U-shaped structure. The first insulating partition, the fuse support plate and the terminal avoidance groove cooperate to achieve reliable installation, limit and positioning of the fuse 1a, and isolate the fuse 1a from other components in the load circuit breaker, ensuring that the fuse 1a works reliably and stably.

[0158] Preferably, Figure 5 and 6 As shown, a second insulating partition is provided between the fuse terminals 9 of the adjacent phase circuits, and the second insulating partition includes two second semi-insulating partitions 13 respectively provided on a pair of housing side walls of the switch housing 1. Further, as Figure 6 As shown, a first insulating partition and a second insulating partition are respectively provided on both sides of each fuse 9. The second insulating partition is beneficial to improving the creepage distance and insulation gap between adjacent phase circuits and improving the insulation performance of the load breaking switch.

[0159] Specifically, a first semi-insulating partition 15, a semi-supporting plate 14 and a second semi-insulating partition 13 are respectively provided on the first side wall 12-0 and the second side wall 12-1, and the three are located at one end of the first side wall 12-0 and the second side wall 12-1 close to the cover body 11.

[0160] like Figure 8 , 10 -12, 24-25, another important innovation of the load-break switch of the present invention is that it includes a screw introduction structure 2a, which is as follows:

[0161] Preferably, Figure 8 and 10As shown, the load-breaking switch of the present invention further includes an input wiring board 4i, the switch housing 1 includes a first housing side 1-0 and a second housing side 1-1 that are arranged opposite to each other, the input wiring board 4i is arranged on the first housing side 1-0, and the two ends of the screw introduction structure 2a are respectively arranged close to the first housing side 1-0 and the second housing side 1-1; when the load-breaking switch is connected, the user conveys the busbar connection screws 21a from the second housing side 1-1 through the screw introduction structure 2a to the first housing side 1-0, and fixes the input wiring board 4i and the incoming busbar. Further, as Fig.10 As shown, the screw introduction structure 2a is a cylindrical structure, including an introduction structure body 20a and two annular grooves 200a respectively arranged at both ends of the introduction structure body 20a. The screw introduction structure 2a is limitedly matched with the switch housing 1 through the two annular grooves 200. Fig.12 , 24 As shown in FIG. 25, the semi-circular limiting groove of the introduction structure is provided on the semi-support plate 14, and both ends of the screw introduction structure 2a are limited by the two semi-support plates 14, and each annular groove 200a is limited by the side walls of the two semi-circular limiting grooves of the introduction structure. Further, the entrance end of the screw introduction structure 2a is blocked by the fuse 1a.

[0162] Preferably, Fig.12 As shown, the screw introduction structure 2a and the contact support 5 are perpendicular to each other, and the contact support 5 includes an introduction structure avoidance hole 500 for the screw introduction structure 2a to pass through, and the introduction structure avoidance hole 500 is a waist-shaped hole.

[0163] Specifically, Figure 8 , 21 As shown in Figures 26, the load-breaking switch of the present invention comprises three input wiring boards 4-i arranged side by side and spaced apart on the first side 1-0 of the casing, which are the first phase input wiring board 4-1i, the second phase input wiring board 4-2i and the third phase input wiring board 4-3i, and three screw introduction structures 2a are respectively arranged corresponding to the three input wiring boards 4-i; the first phase input wiring board 4-1i, the second phase input wiring board 4-2i and the third phase input wiring board 4-3i are respectively connected to the three contact systems of the three phase circuits; the first output wiring board 5-1o, the second output wiring board 5-2o and the third output wiring board 5-3o are respectively connected to the other three contact systems of the three connected circuits.

[0164] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A load-breaking switch, comprising a switch housing (1), an operating mechanism (2) and a contact system respectively arranged in the switch housing (1); the operating mechanism (2) comprises a power handle (20), the contact system comprises a movable contact system and a stationary contact (8) used in conjunction with each other, the movable contact system comprises a contact support (5) and a movable contact assembly (6) arranged on the contact support (5); the movable contact system is driven to reciprocate by turning the power handle (20), so that the movable contact assembly (6) and the stationary contact (8) are closed / opened; characterized in that: The switch housing (1) comprises a cover body (11) and a housing body (12), wherein the cover body (11) is arranged on one side of the housing body (12); The load circuit breaker further comprises a first locking mechanism (3) driven and matched with the operating mechanism (2); when the operating mechanism (2) is operated to close the load circuit breaker, the first locking mechanism (3) moves and locks with the cover body (11) to prevent the cover body (11) from being opened; when the operating mechanism (2) is turned to open the load circuit breaker, the operating mechanism (2) drives the first locking mechanism (3) to move and release the locking match with the cover body (11).

2. The load-breaking switch according to claim 1, characterized in that: The moving directions of the first locking mechanism (3) and the moving contact system are parallel to each other.

3. The load-breaking switch according to claim 1, characterized in that: The operating mechanism (2) comprises a power handle (20) drivingly matched with the first locking mechanism (3); when the power handle (20) is turned to close the load circuit breaker, the first locking mechanism (3) moves to lock with the cover body (11); when the power handle (20) is turned to open the load circuit breaker, the power handle (20) drives the first locking mechanism (3) to move and release the locking match with the cover body (11).

4. The load-breaking switch according to claim 3, characterized in that: The first locking mechanism (3) comprises a first locking mechanism body (30) and at least one first locking hook (31) arranged on the first locking mechanism body (30); the first locking mechanism body (30) is drivingly matched with the power handle (20) and is position-limited matched with the housing body (20); the cover body (11) comprises at least one first locking buckle (11-10); When the power handle (20) is toggled to close the load circuit breaker, the power handle (20) drives the first locking mechanism body (30) to drive the first locking hook (31) to move toward the first locking buckle (11-10), so that the first locking hook (31) and the first locking buckle (11-10) are locked and matched; when the power handle (20) is toggled to open the load circuit breaker, the first locking mechanism body (30) is reset and drives the first locking hook (31) away from the first locking buckle (11-10), so that the first locking hook (31) is released from the locking match with the first locking buckle (11-10).

5. The load-breaking switch according to claim 4, characterized in that: The first locking buckle (11-10) comprises a first locking groove, and the first locking hook (31) is locked and matched with the first locking groove.

6. The load-breaking switch according to claim 4, characterized in that: The shell body (12) comprises a first track groove, and the first locking mechanism body (30) is slidably arranged in the first track groove; the shell body (12) comprises a first side wall (12-0) and a second side wall (12-1) arranged opposite to each other, and the first track groove is located between the first side wall (12-0) and the second side wall (12-1), and its extension direction is parallel to the moving direction of the moving contact system.

7. The load-breaking switch according to any one of claims 1 to 6, characterized in that: The first locking mechanism (3) further comprises a first reset spring (3a), and when the power handle (20) of the operating mechanism (2) is toggled to close the load-breaking switch, the first reset spring (3a) drives the first locking mechanism (3) to move and reset and cooperate with the locking of the cover body (11).

8. The load-breaking switch according to claim 7, characterized in that: The power handle (20) and the first return spring (3a) are respectively arranged at two ends of the first locking mechanism body (30).

9. The load-breaking switch according to claim 4, characterized in that: 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 snap-fitted with the cover body main body (11-0); and the surface cover (11-0) comprises a first locking buckle (11-10).

10. The load-breaking switch according to claim 9, characterized in that: One end of the cover body (11) is hinged to the shell body (12), and the other end is limitedly engaged with the shell body (12); after the first locking mechanism (3) and the cover body (11) are released from the limited engagement, the cover body (11) can be rotated and opened relative to the shell body (12).

11. The load-break switch according to claim 9, characterized in that: The cover body (11-0) comprises a cover mounting hole (11-01) arranged thereon for mounting a transparent cover (11-1); the transparent cover (11-1) comprises a cover body (11-11) and a cover hook (11-12) arranged at one end of the cover body (11-11); one end of the cover body (11-11) is limitedly matched with one end of the cover mounting hole (11-01), and the cover hook (11-12) at the other end of the cover body (11-11) is snap-fitted with the other end of the cover mounting hole (11-01).

12. The load-break switch according to claim 9, characterized in that: The load-breaking switch also includes a fuse (1a), the transparent cover (11-1) and the fuse (1a) are arranged in a one-to-one correspondence, and the transparent cover (11-1) also includes two voltage detection holes (11-14) arranged at intervals, which respectively correspond to two fuse voltage detection ends of the fuse (1a).

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