Fuse-embedded contactor

Abstract

The application relates to the field of switch electric appliances, in particular to a contactor with built-in fuse. The contactor with built-in fuse comprises a first contactor and a second contactor, the first contactor comprises a first electromagnetic system, a first cover shell, a first movable contact bridge, a first static contact and a second static contact; the second contactor comprises a second electromagnetic system, a second cover shell, a second movable contact bridge, a third static contact and a fourth static contact; the contactor further comprises a fuse, the fuse comprises a third cover shell, a first fuse static contact, a second fuse static contact and a fuse body; the second static contact, the first fuse static contact, the fuse body, the second fuse static contact and the fourth static contact are connected in series. The contactor with built-in fuse has the advantages that the first contactor, the fuse and the second contactor are integrated and connected in series, the copper bars and the fuse base between devices are reduced, and the contactor has the functions of conduction and breaking under normal current and the fuse has the function of melting under short-circuit current.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of switching electrical appliances, in particular to a contactor with built-in fuse. BACKGROUND

[0002] The prior art power distribution unit has the following defects:

[0003] 1. Low-voltage electrical appliances (such as DC contactors, fuses, disconnectors, circuit breakers) need to be connected by external copper bars. Some, such as high-voltage fuses, need to be connected to copper bars through external bases, which requires a large amount of space and high cost in new energy vehicles, charging piles, photovoltaic power generation / wind power energy storage high-voltage distribution boxes such as battery distribution unit (BDU), power distribution unit (PDU), and power conversion system (PCS), which does not meet the basic concept of new energy lightweight and integration.

[0004] 2. Single low-voltage electrical appliances (such as DC contactors, fuses, disconnectors, circuit breakers) can only realize corresponding functions.

[0005] The existing low-voltage electrical appliances such as contactors not only have single function, but only have the normal current conduction and breaking function of the contactor itself, and there is a safety hazard of contact adhesion caused by short circuit. Moreover, when the contactor is applied in a power distribution unit, it also needs to be connected with other low-voltage electrical appliances such as fuses through copper bars, and even the fuse needs to be externally connected to a base, resulting in high cost and large space occupation. SUMMARY

[0006] The present application aims to overcome at least one defect of the prior art and provide a contactor with built-in fuse.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] The contactor with built-in fuse comprises a first contactor and a second contactor. The first contactor comprises a first electromagnetic system, a first housing, a first movable contact bridge arranged in the first housing and driven by the first electromagnetic system, a first static contact and a second static contact. One end of the first static contact and the second static contact respectively extends into the first housing and is arranged opposite to the two ends of the first movable contact bridge, and the other end respectively extends to the outside of the first housing.

[0009] The second contactor includes a second electromagnetic system, a second housing, a second moving contact bridge disposed inside the second housing and driven by the second electromagnetic system, a third stationary contact and a fourth stationary contact, one end of the third stationary contact and the fourth stationary contact respectively extending into the second housing and being disposed opposite to the two ends of the second moving contact bridge, and the other end of the third stationary contact and the fourth stationary contact respectively extending to the outside of the second housing;

[0010] The fuse-embedded contactor also includes a fuse, which includes a third housing, a first fuse stationary contact, a second fuse stationary contact, and at least one fusible element disposed within the third housing; the second stationary contact, the first fuse stationary contact, the fusible element, the second fuse stationary contact, and the fourth stationary contact are connected in series in sequence.

[0011] Optionally, the first cover, the third cover, and the second cover are sequentially and integrally connected to form a common cover. The common cover is provided with a first connecting hole for connecting the interiors of the first cover and the third cover, and a second connecting hole for connecting the interiors of the second cover and the third cover.

[0012] Optionally, the second stationary contact, the first fuse stationary contact, the second fuse stationary contact, and the fourth stationary contact are arranged sequentially along a straight line in the first direction;

[0013] The length directions of the first and second moving contact bridges are respectively arranged along the first direction. The first and second stationary contacts are respectively located above the two ends of the length direction of the first moving contact bridge in the second direction. The third and fourth stationary contacts are respectively located above the two ends of the length direction of the second moving contact bridge in the second direction. The first direction and the second direction are perpendicular to each other.

[0014] Optionally, the first cover, the third cover, and the second cover are sequentially and integrally connected along the first direction to form a shared cover in a straight line.

[0015] Optionally, the second stationary contact, the first fuse stationary contact, the second fuse stationary contact, and the fourth stationary contact are arranged sequentially along a straight line in the first direction;

[0016] The first and second moving contact bridges are respectively arranged along a third direction in the length direction. The first and second stationary contacts are respectively located above the two ends of the first moving contact bridge in the second direction. The third and fourth stationary contacts are respectively located above the two ends of the second moving contact bridge in the second direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0017] Optionally, the first and second covers are vertically and integrally connected to the two ends of the third cover in the first direction to form a U-shaped shared cover.

[0018] Optionally, the second static contact and the first fuse static contact are integrally connected to form a first common static contact.

[0019] The second fuse static contact and the fourth static contact are integrally connected to form a second common static contact.

[0020] Optionally, the first fuse static contact and the second fuse static contact are of the same structure and symmetrically arranged, and the symmetry plane thereof is perpendicular to the first direction, and the first fuse static contact and the second fuse static contact are both flat plate structures arranged perpendicular to the first direction; one side of the first fuse static contact in the first direction is used for electrical connection with the second static contact, and one side of the second fuse static contact in the first direction is used for electrical connection with the fourth static contact.

[0021] The fuse body is located between the first fuse static contact and the second fuse static contact in the first direction, one end of the fuse body is connected to the other side of the first fuse static contact in the first direction, and the other end of the fuse body is connected to the other side of the second fuse static contact in the first direction.

[0022] Optionally, the first fuse static contact and the second fuse static contact are of the same structure and symmetrically arranged, and the symmetry plane thereof is perpendicular to the first direction, and the first fuse static contact and the second fuse static contact are both T-shaped structures, including a transverse part arranged perpendicular to the second direction and a longitudinal part arranged perpendicular to the first direction, and the first direction and the second direction are perpendicular to each other; one side of the longitudinal part of the first fuse static contact away from the transverse part is used for electrical connection with the second static contact, and one side of the longitudinal part of the second fuse static contact away from the transverse part is used for electrical connection with the fourth static contact.

[0023] The fuse body is located between the first fuse static contact and the second fuse static contact in the first direction, one end of the fuse body is connected to the side of the transverse part of the first fuse static contact away from the longitudinal part, and the other end of the fuse body is connected to the side of the transverse part of the second fuse static contact away from the longitudinal part.

[0024] Or, the fuse body is located below the first fuse static contact and the second fuse static contact in the second direction, one end of the fuse body is connected to the lower side of the transverse part of the first fuse static contact, and the other end of the fuse body is connected to the lower side of the transverse part of the second fuse static contact.

[0025] Optionally, the middle part of the fuse body is provided with a wave structure formed by alternately arranging a fuse body wave crest part and a fuse body wave trough part.

[0026] And / or, the middle part of the fuse body is provided with at least one row of fuse body through holes, and each row of fuse body through holes is provided with a plurality of fuse body through holes.

[0027] And / or, the third cover is filled with quartz sand.

[0028] Optionally, the first contactor further comprises a first auxiliary contact group, the first auxiliary contact group comprises a first conducting structure arranged in the first cover, two first auxiliary static contacts, one end of the two first auxiliary static contacts respectively extends into the first cover and is arranged correspondingly to the first conducting structure, and the other end of the two first auxiliary static contacts respectively extends to the outside of the first cover, and the first electromagnetic system can drive the first conducting structure to conduct and disconnect the two first auxiliary static contacts.

[0029] The second contactor further comprises a second auxiliary contact group, the second auxiliary contact group comprises a second conducting structure arranged in the second cover, two second auxiliary static contacts, one end of the two second auxiliary static contacts respectively extends into the second cover and is arranged correspondingly to the second conducting structure, and the other end of the two second auxiliary static contacts respectively extends to the outside of the second cover, and the second electromagnetic system can drive the second conducting structure to conduct and disconnect the two second auxiliary static contacts.

[0030] Optionally, the first cover is fixedly connected to the magnetic yoke of the first electromagnetic system, and the second cover is fixedly connected to the magnetic yoke of the second electromagnetic system.

[0031] Optionally, the first electromagnetic system and the second electromagnetic system each comprise a coil former, a coil wound on the outer side of the coil former, an iron core sleeve arranged on the inner side of the coil former, a moving iron core slidingly arranged in the iron core sleeve, a magnetic yoke arranged on the coil former and the iron core sleeve and opposite to the moving iron core, a return spring connected between the moving iron core and the magnetic yoke, a transmission assembly and a pushing assembly, the moving iron core is connected to the transmission assembly, and the transmission assembly and the pushing assembly are drivingly matched; the first moving contact bridge is arranged on the transmission assembly of the first electromagnetic system, and the second moving contact bridge is arranged on the transmission assembly of the second electromagnetic system.

[0032] Optionally, the fuse further comprises an indicator, the indicator comprises an indicating member, an elastic member, a limiting member and a fuse, the fuse of the indicator is arranged in the third cover and is connected in series between the first fuse static contact and the second fuse static contact, the resistance of the fuse is greater than the resistance of the fuse body, the indicating member is movably arranged, the indicating member can move between an initial position and an indicating position, the elastic member is connected to the indicating member, and the limiting member is connected between the fuse and the indicating member; when the fuse is not fused, the limiting member limits the indicating member, so that the indicating member remains in the initial position against the elastic force of the elastic member; when the fuse is fused, the elastic member releases energy to drive the indicating member to move from the initial position to the indicating position.

[0033] The fuse built-in contactor of the application integrates the first contactor, the fuse and the second contactor together in series, reduces the copper bars and the fuse base between the devices, reduces the cost and the occupied space, has the contactor conduction and breaking function at normal current and the fuse breaking function at short circuit current, solves the risk of circuit disconnection caused by contact adhesion, and improves the use safety and reliability.

[0034] In addition, the ceramic parts (i.e. the first cover, the third cover and the second cover) of the first contactor, the fuse and the second contactor are integrated, all the ceramic parts are simultaneously brazed, the processing cost is significantly reduced, the integration degree is improved, and the installation is simplified.

[0035] In addition, the stationary contact of the contactor and the stationary contact of the fuse are integrated, the number of stationary contacts is reduced, the welding process between two stationary contacts is omitted, the installation is simplified, and the integrated connection is more reliable.

[0036] In addition, the fuse built-in contactor has a more reasonable layout, the fuse separates the first contactor and the second contactor, increases the distance between the first contactor and the second contactor, does not appear the explosion after continuous arc, has higher safety, and is arranged in a straight line, so that the structure is simpler and the manufacturing is easier.

[0037] In addition, the fuse built-in contactor has a more compact layout, can greatly reduce the product length, is suitable for more use scenarios, and is especially suitable for use scenarios with limited length size or special product shape requirements. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is an exploded view of the fuse built-in contactor of the first embodiment of the application;

[0039] Figure 2 is an assembly view of the fuse built-in contactor of the first embodiment of the application;

[0040] Figure 3 is a perspective view of the fuse built-in contactor of the first embodiment of the application;

[0041] Figure 4 is a circuit schematic diagram of the fuse built-in contactor of the first embodiment of the application;

[0042] Figure 5 is an assembly view of the fuse built-in contactor of the second embodiment of the application;

[0043] Figure 6 is a sectional view of the fuse built-in contactor of the second embodiment of the application;

[0044] Figure 7is a circuit schematic diagram of a fuse built-in contactor of a second embodiment of the present application;

[0045] Figure 8 is a sectional view of a fuse built-in contactor of a third embodiment of the present application;

[0046] Figure 9 is a sectional view of a fuse built-in contactor of a fourth embodiment of the present application;

[0047] Figure 10 is an exploded view of a fuse of a fifth embodiment of the present application;

[0048] Figure 11 is an assembled view of a fuse of a fifth embodiment of the present application;

[0049] Figure 12 is an assembled view of an indicator of a fifth embodiment of the present application;

[0050] Figure 13 is an exploded view of an indicator of a fifth embodiment of the present application;

[0051] Figure 14 is an exploded view of an indicator of a sixth embodiment of the present application;

[0052] Figure 15 is an exploded view of an indicator of a seventh embodiment of the present application

[0053] Figure 16 is an exploded view of an indicator of an eighth embodiment of the present application

[0054] Figure 17 is an exploded view of an indicator of a ninth embodiment of the present application;

[0055] Figure 18 is a sectional view of a fuse built-in contactor of a first embodiment of the present application from another perspective;

[0056] Figure 19 is a structural schematic diagram of a fuse of a first embodiment of the present application.

[0057] fuse FU; fuse housing 110; third cover 111; fuse housing recess 1111; fuse housing through hole 1112; fuse cover plate 112; first fuse fixed contact 120; second fuse fixed contact 130; fuse body 140; fuse body main body 141; first connection end 142; second connection end 143; fuse body wave crest 144; fuse body wave trough 145; fuse body through hole 146; quartz sand 150;

[0058] indicator 200; indicator main body 211; indicator tab 212; indicator boss 213; annular recess 214;

[0059] Hook 220; hook hook part 221; hook middle section 222; hook connecting part 223;

[0060] Fuse 230;

[0061] First elastic sheet 240; first annular sheet 241; first elastic sheet through hole 2411; first elastic leg 242; first elastic leg first section 2421; first elastic leg second section 2422; first elastic leg third section 2423;

[0062] Second elastic sheet 250; second annular sheet 251; second elastic sheet through hole 2511; second elastic leg 252; second elastic leg first section 2521; second elastic leg second section 2522; second elastic leg third section 2523;

[0063] Third elastic sheet 260; third annular sheet 261; third elastic sheet through hole 2611; third elastic leg 262; third elastic leg first section 2621; third elastic leg second section 2622;

[0064] Fourth elastic sheet 270; fourth annular sheet 271; fourth elastic sheet through hole 2711; fourth elastic leg 272; connecting annular sheet 273; Fifth elastic sheet 280; fifth annular sheet 281; fifth elastic sheet through hole 2811; fifth elastic leg 282; fifth elastic leg first section 2821; fifth elastic leg second section 2822; Indicator spring 290; First contactor K1; first auxiliary contact group K1f; first electromagnetic system 310; first housing 320; first movable contact bridge 330; first fixed contact 340; second fixed contact 350; first auxiliary movable contact sheet 360; first auxiliary fixed contact 370;

[0065] Second contactor K2; second auxiliary contact group K2f; second electromagnetic system 410; second housing 420; second movable contact bridge 430; third fixed contact 440; fourth fixed contact 450; second auxiliary movable contact sheet 460; second auxiliary fixed contact 470;

[0066] Common housing 500; first communication hole 501; second communication hole 502;

[0067] First common fixed contact 600; second common fixed contact 700;

[0068] Coil former 810; coil 820; core sleeve 830; movable core 840; magnetic yoke 850; return spring 860; transmission assembly 870; push assembly 880; support 890. DETAILED DESCRIPTION

[0069] The following embodiments, given in conjunction with the accompanying drawings, further illustrate the specific embodiments of the fuse built-in contactor of the present application. The fuse built-in contactor of the present application is not limited to the following embodiments.

[0070] As Figures 1-4 shown, the fuse built-in contactor of the embodiment includes a first contactor K1 and a second contactor K2, the first contactor K1 includes a first electromagnetic system 310, a first housing 320, a first movable contact bridge 330 arranged in the first housing 320 and driven by the first electromagnetic system 310, a first static contact 340 and a second static contact 350, one end of the first static contact 340 and the second static contact 350 respectively extends into the first housing 320 and is arranged opposite to the two ends of the first movable contact bridge 330, and the other end respectively extends to the outside of the first housing 320, the first electromagnetic system 310 drives the first movable contact bridge 330 to contact and conduct or separate and disconnect with the first static contact 340 and the second static contact 350; the second contactor K2 includes a second electromagnetic system 410, a second housing 420, a second movable contact bridge 430 arranged in the second housing 420 and driven by the second electromagnetic system 410, a third static contact 440 and a fourth static contact 450, one end of the third static contact 440 and the fourth static contact 450 respectively extends into the second housing 420 and is arranged opposite to the two ends of the second movable contact bridge 430, and the other end respectively extends to the outside of the second housing 420, the second electromagnetic system 410 drives the second movable contact bridge 430 to contact and conduct or separate and disconnect with the third static contact 440 and the fourth static contact 450.

[0071] In particular, the fuse built-in contactor of the embodiment further includes a fuse FU, the fuse FU includes a third housing 111, a first fuse static contact 120, a second fuse static contact 130 and at least one fuse body 140 arranged in the third housing 111; the second static contact 350, the first fuse static contact 120, the fuse body 140, the second fuse static contact 130 and the fourth static contact 450 are connected in series. As Figure 4 shown, the first contactor K1, the fuse FU and the second contactor K2 form a series circuit, in a normal state, the first contactor K1 and the second contactor K2 are disconnected, and the electrical gap is twice that of a single contactor. Even when one of the first contactor K1 and the second contactor K2 has a contact sticking phenomenon, the other one of the first contactor K1 and the second contactor K2 can continue to work, realizing the disconnection of the series circuit. If the probability of contact sticking of one contactor is 0.1%, the probability of simultaneous contact sticking of two contactors is 0.0001%, which can be almost ignored, therefore, the fuse built-in contactor of the embodiment can solve the risk of failure to disconnect the circuit caused by contact sticking by connecting two contactors in series. The fuse built-in contactor of the embodiment is preferably a DC contactor.

[0072] The fuse built-in contactor of the embodiment integrates the first contactor K1, the fuse FU and the second contactor K2 together in series, reduces the copper bars and the fuse base between devices, reduces the cost and the occupied space, has the contactor conduction and breaking function in normal current and the fuse melting function in short-circuit current, solves the risk of unable to disconnect the circuit caused by the contact adhesion, and improves the use safety and reliability.

[0073] Further, the first contactor K1 of the embodiment further includes a first auxiliary contact group K1f, the first auxiliary contact group K1f includes a first conduction structure arranged in the first housing 320, two first auxiliary static contacts 370, one end of the two first auxiliary static contacts 370 respectively extends into the first housing 320 and is arranged correspondingly with the first conduction structure, and the other end respectively extends to the outside of the first housing 320, and the first electromagnetic system 310 can drive the first conduction structure to conduct and disconnect the two first auxiliary static contacts 370 while driving the first moving contact bridge 330. Specifically, the first conduction structure includes two first auxiliary moving contact pieces 360 arranged one above the other, one end of the two first auxiliary moving contact pieces 360 is arranged opposite to each other, and the other end of the two first auxiliary moving contact pieces 360 is respectively connected with one end of the first auxiliary static contact 370 extending into the first housing 320. When the lower first auxiliary moving contact piece 360 is driven by the first electromagnetic system 310 to move up to contact the upper first auxiliary moving contact piece 360, the two first auxiliary static contacts 370 are conducted between them, that is, the first conduction structure conducts the two first auxiliary static contacts 370; when the lower first auxiliary moving contact piece 360 is driven by the first electromagnetic system 310 to move down to separate from the upper first auxiliary moving contact piece 360, the two first auxiliary static contacts 370 are disconnected between them, that is, the first conduction structure disconnects the two first auxiliary static contacts 370. The first auxiliary contact group K1f with monitoring function of the first contactor K1, the first auxiliary moving contact piece 360 in the first auxiliary contact group K1f is mechanically linked with the first moving contact bridge 330, and can monitor the opening and closing state of the first contactor K1.

[0074] Of course, as other embodiments, the first conduction structure can also be a moving contact bridge structure, two ends of the first conduction structure are respectively arranged opposite to each other with the two first auxiliary static contacts 370, the two first auxiliary static contacts 370 are conducted between them when the two ends of the first conduction structure are respectively contacted with the two first auxiliary static contacts 370 driven by the first electromagnetic system 310; the two first auxiliary static contacts 370 are disconnected between them when the two ends of the first conduction structure are respectively separated from the two first auxiliary static contacts 370 driven by the first electromagnetic system 310.

[0075] The second contactor K2 of the embodiment further comprises a second auxiliary contact group K2f, which comprises a second conduction structure arranged in the second housing 420, two second auxiliary fixed contacts 470, one end of each of the two second auxiliary fixed contacts 470 is arranged in the second housing 420 corresponding to the second conduction structure, and the other end of each of the two second auxiliary fixed contacts 470 extends to the outside of the second housing 420, and the second electromagnetic system 410 can drive the second conduction structure to conduct and disconnect the two second auxiliary fixed contacts 470 while driving the second movable contact bridge 430. Specifically, the second conduction structure comprises two second auxiliary movable contact pieces 460 arranged one above the other, one end of each of the two second auxiliary movable contact pieces 460 is arranged opposite to each other, and the other end of each of the two second auxiliary movable contact pieces 460 is connected with one end of the second auxiliary fixed contact 470 extending into the second housing 420. When the second electromagnetic system 410 drives the lower second auxiliary movable contact piece 460 to move up to contact the upper second auxiliary movable contact piece 460, the two second auxiliary fixed contacts 470 are conducted, that is, the second conduction structure conducts the two second auxiliary fixed contacts 470; when the second electromagnetic system 410 drives the lower second auxiliary movable contact piece 460 to move down to separate from the upper second auxiliary movable contact piece 460, the two second auxiliary fixed contacts 470 are disconnected, that is, the second conduction structure disconnects the two second auxiliary fixed contacts 470. The second auxiliary contact group K2f of the second contactor K2 with the monitoring function, the second auxiliary movable contact piece 460 in the second auxiliary contact group K2f is mechanically linked with the second movable contact bridge 430, and the opening and closing state of the second contactor K2 can be monitored.

[0076] Of course, as other embodiments, the second conduction structure can also be a movable contact bridge structure, two ends of the second conduction structure are arranged opposite to each of the two second auxiliary fixed contacts 470, the second electromagnetic system 410 drives the two ends of the second conduction structure to contact the two second auxiliary fixed contacts 470 respectively, and the two second auxiliary fixed contacts 470 are conducted; the second electromagnetic system 410 drives the two ends of the second conduction structure to separate from the two second auxiliary fixed contacts 470 respectively, and the two second auxiliary fixed contacts 470 are disconnected.

[0077] It should be noted that the first electromagnetic system 310 and the second electromagnetic system 410 of the embodiment are prior art, and the details thereof can be referred to in the prior art. Figure 3 and Figure 18The first electromagnetic system 310 comprises a coil former 810, a coil 820 wound outside the coil former 810, a core sleeve 830 arranged inside the coil former 810, a moving core 840 slidingly arranged in the core sleeve 830, a magnetic yoke 850 arranged on the coil former 810 and the core sleeve 830 and opposite to the moving core 840, a return spring 860 connected between the moving core 840 and the magnetic yoke 850, a transmission assembly 870 and a pushing assembly 880. The moving core 840 is connected with the transmission assembly 870, and the transmission assembly 870 is drivingly matched with the pushing assembly 880. A bracket 890 is arranged on the magnetic yoke 850. When the coil 820 is electrified, the moving core 840 moves upward and is attracted to the magnetic yoke 850, the moving core 840 drives the transmission assembly 870 to move upward, and the transmission assembly 870 drives the pushing assembly 880 to move upward. When the coil 820 is not electrified, the return spring 860 drives the moving core 840 to move downward and repel the magnetic yoke 850, the moving core 840 drives the transmission assembly 870 to move downward, and the transmission assembly 870 drives the pushing assembly 880 to move downward.

[0078] In the embodiment, the first cover 320 of the common cover 500 is fixedly connected on the magnetic yoke 850 of the first electromagnetic system 310 by welding to form a closed space between the first cover 320 and the magnetic yoke 850 of the first electromagnetic system 310. The first moving contact bridge 330 is arranged on the transmission assembly 870 of the first electromagnetic system 310, and the transmission assembly 870 of the first electromagnetic system 310 is located in the first cover 320. The lower first auxiliary moving contact piece 360 is arranged on the bracket 890 of the first electromagnetic system 310 and is drivingly matched with the pushing assembly 880. The moving core 840 of the first electromagnetic system 310 drives the lower first auxiliary moving contact piece 360 to contact and separate from the upper first auxiliary moving contact piece 360 in sequence through the transmission assembly 870 and the pushing assembly 880. The second cover 420 of the common cover 500 is fixedly connected on the magnetic yoke 850 of the second electromagnetic system 410 by welding to form a closed space between the second cover 420 and the magnetic yoke 850 of the second electromagnetic system 410. The second moving contact bridge 430 is arranged on the transmission assembly 870 of the second electromagnetic system 410, and the transmission assembly 870 of the second electromagnetic system 410 is located in the second cover 420. The lower second auxiliary moving contact piece 460 is arranged on the bracket 890 of the second electromagnetic system 410 and is drivingly matched with the pushing assembly 880. The moving core 840 of the second electromagnetic system 410 drives the lower second auxiliary moving contact piece 460 to contact and separate from the upper second auxiliary moving contact piece 460 in sequence through the transmission assembly 870 and the pushing assembly 880.

[0079] As Figures 1-2As shown, in this embodiment, the first housing 320, the third housing 111, and the second housing 420 are made of ceramic. The first housing 320, the third housing 111, and the second housing 420 are sequentially and integrally connected to form a common housing 500, i.e., the common housing 500 is integrally formed. The common housing 500 is provided with a first connecting hole 501 for connecting the interiors of the first housing 320 and the third housing 111, and a second connecting hole 502 for connecting the interiors of the second housing 420 and the third housing 111, respectively for the electrical connection between the second stationary contact 350 and the first fuse stationary contact 120, and the electrical connection between the second fuse stationary contact 130 and the fourth stationary contact 450. In this embodiment, the fuse-integrated contactor integrates the ceramic components (i.e., the first housing 320, the third housing 111, and the second housing 420) of the first contactor K1, the fuse FU, and the second contactor K2 into one piece. All ceramic components are simultaneously brazed, which significantly reduces processing costs, improves integration, and simplifies installation.

[0080] In this embodiment, the third cover 111 and the fuse cover 112 are connected to form a sealed fuse housing 110. The lower side of the third cover 111 is open. The fuse cover 112 is made of metal (e.g., iron) and is connected to the lower side of the third cover 111. The third cover 111 and the fuse cover 112 can be fixedly connected by means of screws or the like.

[0081] Preferably, the third housing 111 is filled with quartz sand 150. The quartz sand 150 encapsulates the molten material 140, which is used to cool and deionize the arc generated when the molten material 140 melts during a short circuit, facilitating rapid arc extinguishing and improving the breaking capacity of the fuse FU.

[0082] like Figures 1-3 As shown in Figure 19, the melt 140 in this embodiment includes a melt body 141 as the middle part of the melt 140, a first connecting end 142 and a second connecting end 143 as the two ends of the melt 140 and bent and connected to the two ends of the melt body 141, respectively. The first connecting end 142 is connected to the first fuse stationary contact 120 by welding, and the second connecting end 143 is connected to the second fuse stationary contact 130 by welding.

[0083] Preferably, the melt 140 has a wave structure in the middle, which is formed by alternating melt crests 144 and melt troughs 145. Bending the melt 140 into a wave shape within a limited space significantly increases the actual length of the current path, directly increasing the resistance of the melt 140. The current path is narrower at the bends of the wave, and due to structural stress, these points are more likely to be the first to melt (weak points), facilitating rapid arc extinguishing and improving the breaking capacity of the fuse FU.

[0084] Preferably, the molten metal 140 has at least one row of molten metal through holes 146 in its middle section, and each row of molten metal through holes 146 has multiple molten metal through holes 146. The molten metal through holes 146 can be circular holes, square holes, or other structures. The multi-hole structure increases the length of the path that the current must take, and the multi-hole structure becomes a weak point that is preferentially melted, which facilitates rapid arc extinguishing and improves the breaking capacity of the fuse FU.

[0085] like Figures 1-3 The diagram shows a first embodiment of a fuse-embedded contactor. The length direction of the fuse-embedded contactor is a first direction (X direction in the diagram), the height direction is a second direction (Y direction in the diagram), and the width direction is a third direction (Z direction in the diagram). The first direction, the second direction, and the third direction are perpendicular to each other. In this embodiment, the first contactor K1, the fuse FU, and the second contactor K2 are arranged in a straight line along the first direction.

[0086] Specifically, the second stationary contact 350, the first fuse stationary contact 120, the second fuse stationary contact 130, and the fourth stationary contact 450 are arranged sequentially along a straight line in the first direction; the length directions of the first moving contact bridge 330 and the second moving contact bridge 430 are respectively arranged along the first direction; the first stationary contact 340 and the second stationary contact 350 are respectively located above the two ends of the length direction of the first moving contact bridge 330 in the second direction; and the third stationary contact 440 and the fourth stationary contact 450 are respectively located above the two ends of the length direction of the second moving contact bridge 430 in the second direction. The fuse-embedded contactor layout of this embodiment is more reasonable. The fuse FU separates the first contactor K1 and the second contactor K2, increasing the distance between them, preventing explosions after continuous arcing, thus improving safety. Furthermore, the straight-line arrangement simplifies the structure and facilitates manufacturing.

[0087] In this embodiment, the first cover 320, the third cover 111, and the second cover 420 are integrally connected along the first direction to form a single-line common cover 500. The structure is simple and easy to manufacture.

[0088] Preferably, the second stationary contact 350 and the first fuse stationary contact 120 are integrally connected to form a first common stationary contact 600, and the second fuse stationary contact 130 and the fourth stationary contact 450 are integrally connected to form a second common stationary contact 700. During installation, the second stationary contact 350 of the first common stationary contact 600 is inserted into the first cover 320 through the first communication hole 501 of the common cover 500, and then the first common stationary contact 600 is welded on the common cover 500; the fourth stationary contact 450 of the second common stationary contact 700 is inserted into the second cover 420 through the second communication hole 502 of the common cover 500, and then the second common stationary contact 700 is welded on the common cover 500; the first connecting end 142 of the fuse body 140 is welded on the first fuse stationary contact 120 of the first common stationary contact 600, and the second connecting end 143 of the fuse body 140 is welded on the second fuse stationary contact 130 of the second common stationary contact 700. Since the first cover 320, the third cover 111 and the second cover 420 are integrally designed as the common cover 500, and the second stationary contact 350 and the first fuse stationary contact 120 are integrally designed as the first common stationary contact 600, and the second fuse stationary contact 130 and the fourth stationary contact 450 are integrally designed as the second common stationary contact 700, all the soldering is completed in the same process, which simplifies the processing procedure, improves the efficiency and reduces the cost. Integrating the stationary contact of the contactor and the stationary contact of the fuse FU reduces the number of stationary contacts, eliminates the welding process between two stationary contacts, simplifies the installation, and the integrated connection is more reliable.

[0089] In the present embodiment, the second stationary contact 350 and the fourth stationary contact 450 have the same structure and are symmetrically arranged, and the symmetry plane is perpendicular to the first direction, and the second stationary contact 350 and the fourth stationary contact 450 are both flat plate structures arranged perpendicular to the second direction. Unlike the first stationary contact 340 and the third stationary contact 440 adopting the traditional cylindrical structure, the second stationary contact 350 and the fourth stationary contact 450 of the present embodiment adopt the flat plate structure, which is beneficial to the integrated design with the first fuse stationary contact 120 and the second fuse stationary contact 130, respectively.

[0090] As shown in FIG. 6, the first stationary contact 340 and the third stationary contact 440 are both cylindrical structures arranged perpendicular to the first direction, and the second stationary contact 350 and the fourth stationary contact 450 are both flat plate structures arranged perpendicular to the second direction. Figure 3As shown, the connection structure between the melt 140 and the first and second fuse static contacts 120 and 130 in the embodiment is that the first and second fuse static contacts 120 and 130 are identical in structure, symmetrically arranged, and the symmetry plane thereof is perpendicular to the first direction, and the first and second fuse static contacts 120 and 130 are both flat plate structures arranged perpendicular to the first direction; one side of the first fuse static contact 120 in the first direction is used for electrical connection with the second static contact 350, and one side of the second fuse static contact 130 in the first direction is used for electrical connection with the fourth static contact 450; the melt 140 is located between the first and second fuse static contacts 120 and 130 in the first direction, the first connection end 142 at one end of the melt 140 is connected to the other side of the first fuse static contact 120 in the first direction, and the second connection end 143 at the other end of the melt 140 is connected to the other side of the second fuse static contact 130 in the first direction.

[0091] In the embodiment, the first fuse static contact 120 of the flat plate and the second static contact 350 of the flat plate are connected in T shape, the second fuse static contact 130 of the flat plate and the fourth static contact 450 of the flat plate are connected in T shape, that is, the first and second common static contacts 600 and 700 are identical in structure, symmetrically arranged, and the symmetry plane thereof is perpendicular to the first direction, and the first and second common static contacts 600 and 700 are both T-shaped structures.

[0092] In the embodiment, two melts 140 are arranged, and the two melts 140 are respectively connected in series between the first and second fuse static contacts 120 and 130, and the two melts 140 are arranged in parallel in the second direction, and the two melts 140 are identical in structure, and the melt main bodies 141 thereof are similar to the linear structures arranged along the first direction. Of course, more melts 140 can also be arranged.

[0093] As shown in FIG. 6, the first and second common static contacts 600 and 700 are identical in structure, symmetrically arranged, and the symmetry plane thereof is perpendicular to the first direction, and the first and second common static contacts 600 and 700 are both T-shaped structures. Figures 1-3As shown, the fuse FU of the embodiment further comprises an indicator 200. The indicator 200 of the embodiment comprises an indicating member 210, an elastic member, a limiting member and a fuse 230, the fuse 230 of the indicator 200 is arranged in the third housing 111 and connected in series between the first fuse static contact 120 and the second fuse static contact 130, the indicating member 210 is movably arranged, the indicating member 210 is movable between an initial position and an indicating position, the elastic member is connected with the indicating member 210, and the limiting member is connected between the fuse 230 and the indicating member 210. When the fuse 230 is not fused, the tension of the fuse 230 restricts the limiting member to limit the indicating member 210, so that the indicating member 210 is kept in the initial position against the force of the elastic member; when the fuse 230 is fused due to overcurrent or short circuit, the fuse 230 loses the tension and cannot restrict the limiting member, so that the elastic member drives the indicating member 210 to move from the initial position to the indicating position. It should be noted that the resistance of the fuse 230 is greater than the resistance of the fuse body 140, and in the normal state, the current almost does not flow through the fuse 230; when overcurrent or short circuit occurs, the fuse body 140 is fused first, and then the current flows through the fuse 230 to fuse the fuse 230.

[0094] Specifically, referring to Figures 10-11 , the third housing 111 is provided with a fuse shell recess 1111 arranged on the outside of the third housing 111 and a fuse shell through hole 1112 communicating between the fuse shell recess 1111 and the inside of the third housing 111.

[0095] Referring to Figures 10-12 , the indicating member 210 of the indicator 200 of the embodiment is movably arranged in the fuse shell recess 1111. The indicating member 210 of the embodiment comprises an indicating member body 211 and an indicating sheet 212, the indicating sheet 212 is laminated on the indicating member body 211, and the size of the indicating sheet 212 is greater than the size of the indicating member body 211, a indicating member boss 213 is arranged on the surface of the indicating member body 211 opposite to the indicating sheet 212, and at least one annular groove 214 is arranged on the indicating member boss 213. The arrangement of the annular groove 214 on the indicating member boss 213 can increase the creepage distance. The indicating member body 211 is preferably a cylindrical structure, and of course can also be a square or other shaped column structure; the indicating sheet 212 is preferably a circular sheet, and of course can also be a square or other shaped sheet structure. The indicating sheet 212 can be provided with an indicating mark, which can be one or a combination of color, text and graphics.

[0096] In this embodiment, when the indicator 210 is in the initial position, the indicator 210 is hidden in the fuse housing groove 1111, that is, the indicator piece 212 is recessed in or flush with the side of the third cover 111 where the fuse housing groove 1111 is provided, for indicating that the fuse 230 is in an un-melted state; when the spring energy storage structure of the spring releases energy to drive the indicator 210 to move from the initial position to the indicated position, the indicator 210 pops out from the fuse housing groove 1111, that is, the indicator piece 212 protrudes from the side of the third cover 111 where the fuse housing groove 1111 is provided, for indicating that the fuse 230 is in a melted state.

[0097] In this embodiment, the elastic element is an indicator spring 290. The indicator spring 290 of the indicator 200 is disposed in the fuse housing groove 1111, with one end sleeved on the indicator body 211 and the other end abutting against the bottom wall of the fuse housing groove 1111.

[0098] In this embodiment, the limiting component is a hook 220, which includes a hook connecting part 223 and a hook hook part 221. The hook 220 is connected to the fuse 230 by hooking the hook hook part 221 onto the fuse 230. One end of the hook 220 of the indicator 200 with the hook hook part 221 is located inside the third cover 111, and the other end of the hook 220 with the hook connecting part 223 extends from the fuse housing through hole 1112 into the fuse housing groove 1111 outside the third cover 111; the hook connecting part 223 is integrally injection molded into the indicator 210.

[0099] Specifically, the hook 220 includes a hook middle section 222, which is aligned with or parallel to the center line of the indicator 210. One end of the hook middle section 222 is bent to form the hook portion 221, and the other end is bent to form the hook connecting portion 223. The hook connecting portion 223 is preferably a U-shaped, L-shaped, arc-shaped, or other shaped bent structure. The bent structure of the hook connecting portion 223, which is used for injection molding with the indicator 210, makes the integral connection between the hook 220 and the indicator 210 more secure.

[0100] like Figures 5-7 As shown, this is a second embodiment of a fuse-embedded contactor. The difference between this embodiment and the first embodiment lies in the layout structure. In this embodiment, the first contactor K1 and the second contactor K2 are arranged in parallel and spaced apart, and are arranged perpendicular to the fuse FU.

[0101] Specifically, the second stationary contact 350, the first fuse stationary contact 120, the second fuse stationary contact 130 and the fourth stationary contact 450 are arranged in a straight line in the first direction; the length direction of the first movable contact bridge 330 and the second movable contact bridge 430 are arranged in the third direction respectively, the first stationary contact 340 and the second stationary contact 350 are located above the two ends of the length direction of the first movable contact bridge 330 in the second direction respectively, and the third stationary contact 440 and the fourth stationary contact 450 are located above the two ends of the length direction of the second movable contact bridge 430 in the second direction respectively. The layout of the fuse built-in contactor of the embodiment is more compact, which can greatly reduce the product length, and is suitable for more use scenarios, especially the use scenarios with limited length size or special requirements for product shape.

[0102] In the embodiment, the first cover 320 and the second cover 420 are respectively integrally connected to the two ends of the third cover 111 in the first direction to form a U-shaped common cover 500.

[0103] As shown in Figure 8 The third embodiment of the fuse built-in contactor is different from the first embodiment in the connection structure between the fuse body 140 and the first fuse stationary contact 120 and the second fuse stationary contact 130. The first fuse stationary contact 120 and the second fuse stationary contact 130 of the embodiment are the same in structure and symmetrically arranged, and the symmetry plane is perpendicular to the first direction. The first fuse stationary contact 120 and the second fuse stationary contact 130 are both T-shaped structures, including a transverse part arranged perpendicular to the second direction and a longitudinal part arranged perpendicular to the first direction. The side of the longitudinal part of the first fuse stationary contact 120 away from the transverse part is used for electrical connection with the second stationary contact 350, and the side of the longitudinal part of the second fuse stationary contact 130 away from the transverse part is used for electrical connection with the fourth stationary contact 450.

[0104] The fuse body 140 is located between the first fuse stationary contact 120 and the second fuse stationary contact 130 in the first direction. The first connection end 142 at one end of the fuse body 140 is connected to the side of the transverse part of the first fuse stationary contact 120 away from the longitudinal part, and the second connection end 143 at the other end of the fuse body 140 is connected to the side of the transverse part of the second fuse stationary contact 130 away from the longitudinal part.

[0105] In the embodiment, the first fuse stationary contact 120 in T shape and the second stationary contact 350 in flat plate are connected in cross shape, and the second fuse stationary contact 130 in T shape and the fourth stationary contact 450 in flat plate are connected in cross shape, that is, the first common stationary contact 600 and the second common stationary contact 700 are the same in structure and symmetrically arranged, and the symmetry plane is perpendicular to the first direction. The first common stationary contact 600 and the second common stationary contact 700 are both cross-shaped structures.

[0106] In this embodiment, two fusible elements 140 are provided, and the two fusible elements 140 are connected in series between the first fuse stationary contact 120 and the second fuse stationary contact 130, respectively. The two fusible elements 140 are arranged parallel to each other in the second direction. The two fusible elements 140 have the same structure, and their fusible body 141 is similar to a straight-line structure arranged in the first direction. Of course, more fusible elements 140 can be provided.

[0107] like Figure 9 The diagram shows a fourth embodiment of a fuse-embedded contactor. The difference from the third embodiment lies in the structure of the fusible element 140 and the connection positions of the fusible element 140 on the first fuse stationary contact 120 and the second fuse stationary contact 130. The fusible element 140 is located below the first fuse stationary contact 120 and the second fuse stationary contact 130 in a second direction. A first connecting end 142 at one end of the fusible element 140 is connected to the lower side of the lateral portion of the first fuse stationary contact 120, and a second connecting end 143 at the other end of the fusible element 140 is connected to the lower side of the lateral portion of the second fuse stationary contact 130. Due to the lower opening of the third housing 111, the welding surface between the fusible element 140 and the first fuse stationary contact 120 and the second fuse stationary contact 130 faces the opening of the third housing 111, facilitating laser welding.

[0108] In this embodiment, two fusible elements 140 are provided, connected in series between the first fuse stationary contact 120 and the second fuse stationary contact 130, respectively. The two fusible elements 140 are arranged in parallel and spaced apart. The two fusible elements 140 have the same shape, and their fusible bodies 141 are similar to a U-shape. The two fusible elements 140 are different in size, with the fusible body 141 of the inner fusible element 140 being smaller than that of the outer fusible element 140. The bottom edges of the fusible bodies 141 of the two fusible elements 140 are arranged in parallel and spaced apart in a second direction, and the two side edges of the fusible bodies 141 of the two fusible elements 140 are arranged in parallel and spaced apart in a first direction. Of course, more fusible elements 140 can be provided.

[0109] like Figures 10-13As shown, the fifth embodiment of the fuse built-in contactor is different from the first embodiment in that the elastic member of the indicator 200 is a spring. The spring includes a spring connecting portion and a spring energy storage structure for storing energy, and the spring connecting portion and the hook connecting portion 223 are integrally formed in the indicating member 210 by injection molding. The spring of the indicator 200 is arranged in the fuse shell groove 1111, and the spring energy storage structure thereof abuts against the bottom wall of the fuse shell groove 1111. In this embodiment, the fuse and the indicator thereof, the spring, the hook 220, and the indicating member 210 are integrally formed by injection molding, the structure is simple, the production process is reduced, and there is no need for assembly, thereby reducing the material cost and the assembly cost. Moreover, the spring, the hook 220, and the indicating member 210 are integrally formed by injection molding and are hooked on the fuse 230 through the hook portion 221, the assembly difficulty is low, the fuse 230 of the indicator 200 and the integrally formed spring, hook 220, and indicating member 210 can be assembled in the fuse as a module, the installation is more flexible and simple, the indicator 200 has a wide range of applications, and is more suitable for the use scenario of the contactor built-in fuse.

[0110] As shown in Figures 12-13 The spring connecting portion is in the form of a ring-shaped sheet structure, and the center line of the spring connecting portion coincides with or is arranged in parallel and spaced apart from the center line of the indicating member 210. The spring connecting portion for injection molding with the indicating member 210 is in the form of a ring-shaped sheet structure, so that the spring and the indicating member 210 are more firmly connected integrally. The spring connecting portion is preferably a circular ring sheet, and of course can also be a square ring sheet or other ring-shaped sheet structures.

[0111] Further, the spring energy storage structure includes a plurality of elastic energy storage portions, and the plurality of elastic energy storage portions are respectively connected to the spring connecting portion and are arranged around the center line of the spring connecting portion. The spring energy storage structure of the spring is formed by surrounding arrangement of the plurality of elastic energy storage portions, the structure is simple, and it is convenient for the plurality of elastic energy storage portions to store energy by compression respectively to drive the indicating member 210 to pop out together, so that the indication of the indicating member 210 is more reliable.

[0112] Specifically, the spring of this embodiment is a first spring 240, which includes a first ring-shaped sheet 241 as the spring connecting portion and a plurality of first elastic legs 242 as the elastic energy storage portions, i.e., the spring energy storage structure of this embodiment is formed by surrounding arrangement of the plurality of first elastic legs 242 around the center line of the first ring-shaped sheet 241; the first ring-shaped sheet 241 has a first spring through hole 2411.

[0113] Each first elastic leg 242 comprises a first elastic leg first section 2421, a first elastic leg second section 2422 and a first elastic leg third section 2423 connected in sequence, the first elastic leg first section 2421 is connected with the outer side of the first annular sheet 241 and is arranged flush with the first annular sheet 241, the first elastic leg second section 2422 is arranged obliquely away from the center line of the first annular sheet 241, and the first elastic leg second section 2422 is bent to form the first elastic leg third section 2423 away from the center line of the first annular sheet 241, and the first elastic leg third section 2423 is perpendicular to the center line of the first annular sheet 241. The first elastic leg third section 2423 of each first elastic leg 242 of the elastic sheet energy storage structure of the present embodiment is in contact with the bottom wall of the fuse shell groove 1111. The first elastic leg 242 of the first elastic sheet 240 of the present embodiment is in an outer hook structure, which is simple in structure, easy to form, stretches outward when compressed, and is more convenient for compression energy storage.

[0114] In the present embodiment, the outer diameter of the first annular sheet 241 is smaller than the outer diameter of the indicator body 211, and the end of the first elastic leg first section 2421 connected with the first annular sheet 241 is injection molded in the indicator body 211 together with the first annular sheet 241.

[0115] As shown in Figure 14 The sixth embodiment of the fuse built-in contactor is different from the fifth embodiment in the structure of the elastic sheet of the indicator 200. The elastic sheet of the present embodiment is a second elastic sheet 250, which comprises a second annular sheet 251 as the elastic sheet connecting part and a plurality of second elastic legs 252 as the elastic energy storage parts, i.e., the elastic sheet energy storage structure of the present embodiment is formed by arranging a plurality of second elastic legs 252 around the center line of the second annular sheet 251; the second annular sheet 251 has a second elastic sheet through hole 2511.

[0116] Each second elastic leg 252 comprises a second elastic leg first section 2521, a second elastic leg second section 2522 and a second elastic leg third section 2523 connected in sequence, the second elastic leg first section 2521 is connected with the outer side of the second annular sheet 251 and is arranged flush with the second annular sheet 251, the second elastic leg second section 2522 is arranged obliquely close to the center line of the second annular sheet 251, and the second elastic leg second section 2522 is bent to form the second elastic leg third section 2523 close to the center line of the second annular sheet 251, and the second elastic leg third section 2523 is perpendicular to the center line of the second annular sheet 251. The second elastic leg third section 2523 of each second elastic leg 252 of the elastic sheet energy storage structure of the present embodiment is in contact with the bottom wall of the fuse shell groove 1111. The second elastic leg 252 of the second elastic sheet 250 of the present embodiment is in an inner hook structure, which stretches inward when compressed, saving space.

[0117] In this embodiment, the outer diameter of the second annular piece 251 is smaller than the outer diameter of the indicator body 211, and one end of the second elastic foot segment 2521 connected to the second annular piece 251 is injection molded together with the second annular piece 251 into the indicator body 211.

[0118] like Figure 15 The image shows a seventh embodiment of a fuse-embedded contactor, which differs from the fifth embodiment in the structure of the spring contact of the indicator 200. In this embodiment, the spring contact is a third spring contact 260, which includes a third annular piece 261 serving as the spring contact connecting portion and a plurality of third elastic legs 262 serving as the elastic energy storage portion. That is, the spring contact energy storage structure in this embodiment is formed by a plurality of third elastic legs 262 arranged around the center line of the third annular piece 261; the third annular piece 261 has a third spring contact through hole 2611.

[0119] Each third elastic leg 262 includes a third elastic leg segment 2621, which is a bent structure with a notch facing away from the center line of the third annular piece 261. One end of the third elastic leg segment 2621 is bent and connected to the inner side of the third annular piece 261, and the other end is bent away from the center line of the third annular piece 261 to form a third elastic leg segment 2622, which is perpendicular to the center line of the third annular piece 261. In this embodiment, the third elastic leg segment 2622 of each third elastic leg 262 in the spring energy storage structure abuts against the bottom wall of the fuse housing groove 1111. The third elastic leg segment 2621 is preferably a curved, U-shaped, V-shaped or other shaped bent structure. In this embodiment, the third elastic leg 262 of the third spring 260 extends from the inner hole of the third annular piece 261, which is simple in structure and easy to form.

[0120] In this embodiment, the third annular piece 261 is injection molded into the indicator piece 212.

[0121] like Figure 16 The diagram shows the eighth embodiment of a fuse-embedded contactor, which differs from the fifth embodiment in the structure of the spring contact of the indicator 200. In this embodiment, the spring contact is a fourth spring contact 270. The fourth spring contact 270 includes a fourth annular piece 271 serving as a connecting portion, a plurality of fourth elastic legs 272 serving as elastic energy storage portions, and a connecting annular piece 273 arranged parallel and spaced apart from the fourth annular piece 271. That is, the plurality of fourth elastic legs 272 are arranged around the center line of the fourth annular piece 271. The fourth annular piece 271 has a fourth spring contact through hole 2711.

[0122] The fourth elastic leg 272 is a bent structure with a concave facing the center line of the fourth annular sheet 271. One end of the fourth elastic leg 272 is connected to the outer side of the fourth annular sheet 271, and the other end is connected to the outer side of the connecting annular sheet 273. A plurality of fourth elastic legs 272 are connected to the connecting annular sheet 273 to form the elastic sheet energy storage structure of the embodiment. The connecting annular sheet 273 of the elastic sheet energy storage structure of the embodiment is in contact with the bottom wall of the fuse shell groove 1111. The fourth elastic leg 272 is preferably a bent structure in the shape of an arc, a U, a V, or other shapes. The fourth elastic sheet 270 of the embodiment is formed by two annular sheets and the fourth elastic leg 272 in the middle that can be compressed to store energy. The synchronization of compression and energy storage between each fourth elastic leg 272 is better.

[0123] In the embodiment, the fourth annular sheet 271 is injection molded in the indicator sheet 212.

[0124] As shown in Figure 17 the ninth embodiment of the fuse built-in contactor, the difference from the fifth embodiment is the structure of the elastic sheet of the indicator 200. The elastic sheet of the embodiment is a fifth elastic sheet 280. The fifth elastic sheet 280 includes a fifth annular sheet 281 as the elastic sheet connecting part and a plurality of fifth elastic legs 282 as the elastic energy storage parts. The elastic sheet energy storage structure of the embodiment is formed by arranging a plurality of fifth elastic legs 282 around the center line of the fifth annular sheet 281. The fifth annular sheet 281 has a fifth elastic sheet through hole 2811.

[0125] Each fifth elastic leg 282 includes a first fifth elastic leg section 2821. The first fifth elastic leg section 2821 is a bent structure with a concave facing the center line of the fifth annular sheet 281. One end of the first fifth elastic leg section 2821 is connected to the outer side of the fifth annular sheet 281, and the other end is bent away from the center line of the fifth annular sheet 281 to form a second fifth elastic leg section 2822. The second fifth elastic leg section 2822 is perpendicular to the center line of the fifth annular sheet 281. The second fifth elastic leg section 2822 of each fifth elastic leg 282 of the elastic sheet energy storage structure of the embodiment is in contact with the bottom wall of the fuse shell groove 1111. The first fifth elastic leg section 2821 is preferably a bent structure in the shape of an arc, a U, a V, or other shapes. The first fifth elastic leg section 2821 of the fifth elastic leg 282 of the fifth elastic sheet 280 of the embodiment is in an inner hook structure and is bent outward to form the second fifth elastic leg section 2822, which not only saves space but also can stretch outward when compressed, making it easier to compress and store energy.

[0126] In the embodiment, the fifth annular sheet 281 is injection molded in the indicator sheet 212.

[0127] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating relative importance.

[0128] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all should be considered as falling within the protection scope of the present application.

Claims

1. A fuse-embedded contactor, comprising a first contactor (K1) and a second contactor (K2), wherein the first contactor (K1) comprises a first electromagnetic system (310), a first housing (320), a first moving contact bridge (330) disposed within the first housing (320) and driven by the first electromagnetic system (310), a first stationary contact (340) and a second stationary contact (350), wherein one end of the first stationary contact (340) and the second stationary contact (350) respectively extends into the first housing (320) and is disposed opposite to the two ends of the first moving contact bridge (330), and the other end respectively extends to the outside of the first housing (320); The second contactor (K2) includes a second electromagnetic system (410), a second housing (420), a second moving contact bridge (430) disposed inside the second housing (420) and driven by the second electromagnetic system (410), a third stationary contact (440) and a fourth stationary contact (450), one end of the third stationary contact (440) and the fourth stationary contact (450) respectively extending into the second housing (420) and opposite to the two ends of the second moving contact bridge (430), and the other end respectively extending to the outside of the second housing (420); Its features are: The fuse-embedded contactor also includes a fuse (FU), which includes a third housing (111), a first fuse stationary contact (120), a second fuse stationary contact (130), and at least one fusible element (140) disposed within the third housing (111); the second stationary contact (350), the first fuse stationary contact (120), the fusible element (140), the second fuse stationary contact (130), and the fourth stationary contact (450) are connected in series in sequence; The second stationary contact (350), the first fuse stationary contact (120), the second fuse stationary contact (130), and the fourth stationary contact (450) are arranged sequentially along a straight line in the first direction; The first moving contact bridge (330) and the second moving contact bridge (430) are respectively arranged along a third direction in the length direction. The first stationary contact (340) and the second stationary contact (350) are respectively located above the two ends of the first moving contact bridge (330) in the length direction in the second direction. The third stationary contact (440) and the fourth stationary contact (450) are respectively located above the two ends of the second moving contact bridge (430) in the length direction in the second direction. The first direction, the second direction and the third direction are perpendicular to each other.

2. The fuse-embedded contactor according to claim 1, characterized in that: The first cover (320), the third cover (111) and the second cover (420) are sequentially and integrally connected to form a common cover (500). The common cover (500) is provided with a first connecting hole (501) for connecting the interior of the first cover (320) and the third cover (111) and a second connecting hole (502) for connecting the interior of the second cover (420) and the third cover (111).

3. The fuse-embedded contactor according to claim 1, characterized in that: The first cover (320) and the second cover (420) are vertically and integrally connected to the third cover (111) to form a U-shaped common cover (500) at both ends in the first direction.

4. The fuse-embedded contactor according to claim 1, characterized in that: The second stationary contact (350) and the first fuse stationary contact (120) are integrally connected to form the first common stationary contact (600). The second fuse stationary contact (130) and the fourth stationary contact (450) are integrally connected to form the second common stationary contact (700).

5. The fuse-embedded contactor according to claim 1 or 4, characterized in that: The first fuse stationary contact (120) and the second fuse stationary contact (130) have the same structure and are symmetrically arranged, and their symmetry plane is perpendicular to the first direction. The first fuse stationary contact (120) and the second fuse stationary contact (130) are both flat plate structures arranged perpendicular to the first direction. The first fuse stationary contact (120) is used to be electrically connected to the second stationary contact (350) on one side in the first direction, and the second fuse stationary contact (130) is used to be electrically connected to the fourth stationary contact (450) on one side in the first direction. The fusible element (140) is located in a first direction between the first fuse stationary contact (120) and the second fuse stationary contact (130). One end of the fusible element (140) is connected to the other side of the first fuse stationary contact (120) in the first direction, and the other end of the fusible element (140) is connected to the other side of the second fuse stationary contact (130) in the first direction.

6. The fuse-embedded contactor according to claim 1 or 4, characterized in that: The first fuse stationary contact (120) and the second fuse stationary contact (130) have the same structure and are symmetrically arranged, and their symmetry plane is perpendicular to the first direction. The first fuse stationary contact (120) and the second fuse stationary contact (130) are both T-shaped structures, including a transverse part arranged perpendicular to the second direction and a longitudinal part arranged perpendicular to the first direction. The first direction and the second direction are perpendicular to each other. The side of the longitudinal part of the first fuse stationary contact (120) facing away from the transverse part is used for electrical connection with the second stationary contact (350), and the side of the longitudinal part of the second fuse stationary contact (130) facing away from the transverse part is used for electrical connection with the fourth stationary contact (450). The fusible element (140) is located in a first direction between the first fuse stationary contact (120) and the second fuse stationary contact (130). One end of the fusible element (140) is connected to the side of the first fuse stationary contact (120) facing away from the longitudinal part, and the other end of the fusible element (140) is connected to the side of the second fuse stationary contact (130) facing away from the longitudinal part. Alternatively, the fusible element (140) is located below the first fuse stationary contact (120) and the second fuse stationary contact (130) in the second direction, with one end of the fusible element (140) connected to the lower side of the lateral portion of the first fuse stationary contact (120) and the other end of the fusible element (140) connected to the lower side of the lateral portion of the second fuse stationary contact (130).

7. The fuse-embedded contactor according to claim 1, characterized in that: The melt (140) has a wave structure in the middle, which is formed by alternating melt crests (144) and melt troughs (145); And / or, the melt (140) has at least one row of melt through holes (146) in the middle, and each row of melt through holes (146) has a plurality of melt through holes (146); And / or, the third housing (111) is filled with quartz sand (150).

8. The fuse-embedded contactor according to claim 1, characterized in that: The first contactor (K1) further includes a first auxiliary contact group (K1f), which includes a first conductive structure disposed within the first housing (320) and two first auxiliary stationary contacts (370). One end of each of the two first auxiliary stationary contacts (370) extends into the first housing (320) and is disposed corresponding to the first conductive structure, while the other end extends to the outside of the first housing (320). The first electromagnetic system (310) can drive the first conductive structure to turn on and off the two first auxiliary stationary contacts (370). The second contactor (K2) also includes a second auxiliary contact group (K2f), which includes a second conductive structure disposed in the second housing (420) and two second auxiliary stationary contacts (470). One end of each of the two second auxiliary stationary contacts (470) extends into the second housing (420) and is disposed corresponding to the second conductive structure, and the other end extends to the outside of the second housing (420). The second electromagnetic system (410) can drive the second conductive structure to turn on and off the two second auxiliary stationary contacts (470).

9. The fuse-embedded contactor according to claim 1, characterized in that: The first cover (320) is fixedly connected to the magnetic yoke (850) of the first electromagnetic system (310), and the second cover (420) is fixedly connected to the magnetic yoke (850) of the second electromagnetic system (410).

10. The fuse-embedded contactor according to claim 9, characterized in that: Both the first electromagnetic system (310) and the second electromagnetic system (410) include a coil frame (810), a coil (820) wound around the outside of the coil frame (810), an iron core sleeve (830) disposed inside the coil frame (810), a movable iron core (840) slidably disposed inside the iron core sleeve (830), a magnetic yoke (850) covering the coil frame (810) and the iron core sleeve (830) and disposed opposite to the movable iron core (840), and a magnetic yoke connected to the movable iron core (840). The return spring (860), transmission assembly (870) and push assembly (880) between the magnetic yoke (850) and the moving iron core (840) are connected to the transmission assembly (870), and the transmission assembly (870) and push assembly (880) are driven to cooperate; the first moving contact bridge (330) is disposed on the transmission assembly (870) of the first electromagnetic system (310), and the second moving contact bridge (430) is disposed on the transmission assembly (870) of the second electromagnetic system (410).

11. The fuse-embedded contactor according to claim 1, characterized in that: The fuse (FU) also includes an indicator (200), which includes an indicator (210), an elastic element, a limiting element, and a fuse wire (230). The fuse wire (230) of the indicator (200) is disposed within a third housing (111) and connected in series between the first fuse stationary contact (120) and the second fuse stationary contact (130). The resistance of the fuse wire (230) is greater than the resistance of the fusible element (140). The indicator (210) is movable. The indicator (210) is movable between an initial position and an indicated position. The elastic element is connected to the indicator (210), and the limiting element is connected between the fuse (230) and the indicator (210). When the fuse (230) is not blown, the limiting element restricts the indicator (210), so that the indicator (210) overcomes the force of the elastic element and remains in the initial position. When the fuse (230) is blown, the elastic element releases energy and drives the indicator (210) to move from the initial position to the indicated position.

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