Contactor with built-in fuse

Abstract

The invention relates to the field of switching devices, in particular to a contactor with a built-in fuse. The fuse built-in contactor comprises a first contactor and a second contactor, and the first contactor comprises a first electromagnetic system, a first housing, a first moving contact bridge, a first static contact and a second static contact; the second contactor comprises a second electromagnetic system, a second housing, a second moving contact bridge, a third static contact and a fourth static contact; the contactor further comprises a fuse, and the fuse comprises a third housing, a first fuse static contact, a second fuse static contact and a melt. And the second static contact, the first fuse static contact, the melt, the second fuse static contact and the fourth static contact are sequentially connected in series. According to the built-in contactor of the fuse, the first contactor, the fuse and the second contactor are integrated and connected in series, connecting copper bars between devices and a fuse base are reduced, and the built-in contactor of the fuse has the functions of conduction and breaking of the contactors in normal current and fusing of the fuse in short-circuit current.

Description

Technical Field

[0001] This invention relates to the field of switching electrical appliances, and more specifically to a fuse-integrated contactor. Background Technology

[0002] Existing power distribution units have the following drawbacks: 1. Low-voltage electrical appliances (such as DC contactors, fuses, disconnect switches, and circuit breakers) require external copper busbars for connection. Some, such as high-voltage fuses, even require an external base to connect to the copper busbar. This requires a lot of space in high-voltage distribution boxes for new energy vehicles, charging piles, and photovoltaic / wind power generation energy storage, such as battery distribution units (BDUs), power distribution units (PDUs), and power conversion systems (PCSs). Moreover, the cost is high, which does not conform to the basic concept of lightweight and integrated new energy.

[0003] 2. A single low-voltage electrical appliance (such as a DC contactor, fuse, disconnector, or circuit breaker) can only perform its corresponding function.

[0004] Existing low-voltage electrical appliances, such as contactors, not only have a single function, only having the normal current conduction and disconnection functions of the contactor itself, but also pose a safety hazard of contact sticking due to short circuits. Moreover, when contactors are used in power distribution units, they need to be connected to other low-voltage electrical appliances such as fuses through copper busbars. Even fuses need to be connected to external bases, resulting in high costs and large space occupation. Summary of the Invention

[0005] The purpose of this invention is to overcome at least one defect of the prior art and provide a fuse-integrated contactor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The fuse-embedded contactor includes a first contactor and a second contactor. The first contactor includes a first electromagnetic system, a first housing, a first moving contact bridge disposed inside the first housing and driven by the first electromagnetic system, a first stationary contact and a second stationary contact. One end of the first stationary contact and the second stationary contact respectively extends into the first housing and is disposed opposite to the two ends of the first moving contact bridge, and the other end respectively extends to the outside of the first housing. 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; 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.

[0007] 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.

[0008] 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; 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.

[0009] Optionally, the first cover, the third cover, and the second cover are integrally connected along the first direction to form a shared cover in a straight line.

[0010] 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; 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.

[0011] 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.

[0012] Optionally, the second stationary contact and the first fuse stationary contact are integrally connected to form a first common stationary contact; The second and fourth stationary contacts of the fuse are integrally connected to form a second common stationary contact.

[0013] Optionally, the first and second fuse stationary contacts have the same structure and are symmetrically arranged, and their symmetry plane is perpendicular to the first direction. Both the first and second fuse stationary contacts are flat plate structures arranged perpendicular to the first direction. One side of the first fuse stationary contact in the first direction is used for electrical connection with the second stationary contact, and one side of the second fuse stationary contact in the first direction is used for electrical connection with the fourth stationary contact. The molten element is located in a first direction between the first fuse stationary contact and the second fuse stationary contact. One end of the molten element is connected to the other side of the first fuse stationary contact in the first direction, and the other end of the molten element is connected to the other side of the second fuse stationary contact in the first direction.

[0014] Optionally, the first and second fuse stationary contacts have the same structure and are symmetrically arranged, with their plane of symmetry perpendicular to the first direction. Both the first and second fuse stationary contacts are T-shaped structures, including a transverse portion perpendicular to the second direction and a longitudinal portion perpendicular to the first direction. The first and second directions are perpendicular to each other. The side of the longitudinal portion of the first fuse stationary contact facing away from the transverse portion is used for electrical connection with the second stationary contact, and the side of the longitudinal portion of the second fuse stationary contact facing away from the transverse portion is used for electrical connection with the fourth stationary contact. Wherein, the molten material is located in a first direction between the first fuse stationary contact and the second fuse stationary contact, one end of the molten material is connected to the side of the first fuse stationary contact that is opposite to the longitudinal part of the transverse part, and the other end of the molten material is connected to the side of the second fuse stationary contact that is opposite to the longitudinal part of the transverse part. Alternatively, the fusible element is located below the first and second fuse stationary contacts in a second direction, with one end of the fusible element connected to the lower side of the lateral portion of the first fuse stationary contact and the other end of the fusible element connected to the lower side of the lateral portion of the second fuse stationary contact.

[0015] Optionally, the middle part of the melt is provided with a wave structure, which is formed by alternating melt crests and melt troughs; And / or, the middle part of the melt is provided with at least one row of melt through holes, and each row of melt through holes is provided with multiple melt through holes; And / or, the third housing is filled with quartz sand.

[0016] Optionally, the first contactor further includes a first auxiliary contact group, which includes a first conductive structure disposed within the first housing and two first auxiliary stationary contacts. One end of each of the two first auxiliary stationary contacts extends into the first housing and is disposed corresponding to the first conductive structure, and the other end extends to the outside of the first housing. The first electromagnetic system can drive the first conductive structure to turn on and off the two first auxiliary stationary contacts. The second contactor further includes a second auxiliary contact group, which includes a second conductive structure disposed within the second housing and two second auxiliary stationary contacts. One end of each of the two second auxiliary stationary contacts extends into the second housing and is disposed corresponding to the second conductive structure, while the other end extends to the outside of the second housing. The second electromagnetic system can drive the second conductive structure to turn on and off the two second auxiliary stationary contacts.

[0017] Optionally, the first cover is fixedly connected to the yoke of the first electromagnetic system, and the second cover is fixedly connected to the yoke of the second electromagnetic system.

[0018] Optionally, both the first electromagnetic system and the second electromagnetic system include a coil frame, a coil wound on the outside of the coil frame, an iron core sleeve disposed on the inside of the coil frame, a movable iron core slidably disposed within the iron core sleeve, a magnetic yoke covering the coil frame and the iron core sleeve and disposed opposite to the movable iron core, a return spring connected between the movable iron core and the magnetic yoke, a transmission assembly and a pushing assembly, wherein the movable iron core is connected to the transmission assembly, and the transmission assembly and the pushing assembly drive each other; the first movable contact bridge is disposed on the transmission assembly of the first electromagnetic system, and the second movable contact bridge is disposed on the transmission assembly of the second electromagnetic system.

[0019] Optionally, the fuse further includes an indicator, which includes an indicator element, an elastic element, a limiting element, and a fuse wire. The fuse wire of the indicator is disposed within a third housing and connected in series between the stationary contacts of the first and second fuses. The resistance of the fuse wire is greater than the resistance of the fusible element. The indicator element is movable and can move between an initial position and an indicated position. The elastic element is connected to the indicator element, and the limiting element is connected between the fuse wire and the indicator element. When the fuse wire is not blown, the limiting element restricts the indicator element, causing the indicator element to overcome the force of the elastic element and remain in the initial position. When the fuse wire is blown, the elastic element releases energy and drives the indicator element to move from the initial position to the indicated position.

[0020] The fuse-embedded contactor of the present invention integrates the first contactor, the fuse, and the second contactor into one unit and connects them in series. This reduces the number of copper busbars connecting the devices and the fuse base, thereby reducing costs and space occupation. It also has the functions of contactor conduction and disconnection under normal current and fuse melting under short-circuit current. Moreover, it can solve the risk of failure to disconnect the circuit due to contact adhesion, thus improving safety and reliability.

[0021] In addition, the ceramic components of the first contactor, fuse, and second contactor (i.e., the first housing, the third housing, and the second housing) are integrated into one piece, and all ceramic components are brazed at the same time, which significantly reduces processing costs, improves integration, and simplifies installation.

[0022] In addition, by integrating the stationary contacts of the contactor and the fuse into one unit, the number of stationary contacts is reduced, the welding process between the two stationary contacts is eliminated, installation is simplified, and the integrated connection is more reliable.

[0023] In addition, the fuse-embedded contactor layout is more reasonable. The fuse separates the first and second contactors, increasing the distance between them. This prevents explosions after continuous arcing, resulting in higher safety. Furthermore, the straight-line arrangement simplifies the structure and makes it easier to manufacture.

[0024] In addition, the fuse-integrated contactor layout is more compact, which can greatly reduce the product length and make it suitable for more application scenarios, especially those with limited length or special requirements for product shape. Attached Figure Description

[0025] Figure 1 This is an exploded view of the fuse-embedded contactor according to the first embodiment of the present invention; Figure 2 This is an assembly diagram of the fuse-embedded contactor according to the first embodiment of the present invention; Figure 3 This is a cross-sectional view of the fuse-embedded contactor according to the first embodiment of the present invention. Figure 4 This is a circuit diagram of the fuse-embedded contactor according to the first embodiment of the present invention; Figure 5 This is an assembly diagram of the fuse-embedded contactor according to the second embodiment of the present invention; Figure 6 This is a cross-sectional view of the fuse-embedded contactor according to the second embodiment of the present invention; Figure 7 This is a circuit diagram of the fuse-embedded contactor according to the second embodiment of the present invention; Figure 8 This is a cross-sectional view of the fuse-embedded contactor according to the third embodiment of the present invention; Figure 9 This is a cross-sectional view of the fuse-embedded contactor according to the fourth embodiment of the present invention; Figure 10 This is an exploded view of the fuse according to the fifth embodiment of the present invention; Figure 11 This is an assembly drawing of the fuse according to the fifth embodiment of the present invention; Figure 12 This is an assembly diagram of the indicator according to the fifth embodiment of the present invention; Figure 13 This is an exploded view of the indicator according to the fifth embodiment of the present invention; Figure 14 This is an exploded view of the indicator according to the sixth embodiment of the present invention; Figure 15 This is an exploded view of the indicator of the seventh embodiment of the present invention. Figure 16 This is an exploded view of the indicator according to the eighth embodiment of the present invention. Figure 17 This is an exploded view of the indicator according to the ninth embodiment of the present invention; Figure 18 This is another sectional view of the fuse-embedded contactor according to the first embodiment of the present invention; Figure 19 This is a schematic diagram of the melt structure according to the first embodiment of the present invention.

[0026] Fuse FU; Fuse housing 110; Third cover 111; Fuse housing groove 1111; Fuse housing through hole 1112; Fuse cover plate 112; First fuse stationary contact 120; Second fuse stationary contact 130; Fusible element 140; Fusible element body 141; First connecting end 142; Second connecting end 143; Fusible element crest 144; Fusible element trough 145; Fusible element through hole 146; Quartz sand 150; Indicator 200; Indicator element 210; Indicator element body 211; Indicator plate 212; Indicator element boss 213; Annular groove 214; Hook 220; Hook hook portion 221; Hook middle section 222; Hook connecting part 223; 230 fuse; First spring piece 240; First annular piece 241; First spring piece through hole 2411; First elastic foot 242; First elastic foot segment 1 2421; First elastic foot segment 2422; First elastic foot segment 3 2423; Second spring piece 250; second annular piece 251; second spring piece through hole 2511; second elastic foot 252; first section of second elastic foot 2521; second section of second elastic foot 2522; third section of second elastic foot 2523; Third spring 260; Third annular piece 261; Third spring through hole 2611; Third elastic foot 262; Third elastic foot first section 2621; Third elastic foot second section 2622; Fourth spring 270; Fourth annular piece 271; Fourth spring through hole 2711; Fourth elastic foot 272; Connecting annular piece 273; Fifth spring 280; Fifth annular piece 281; Fifth spring through hole 2811; Fifth elastic foot 282; Fifth elastic foot section 1 2821; Fifth elastic foot section 2822; Indicator spring 290; First contactor K1; First auxiliary contact group K1f; First electromagnetic system 310; First housing 320; First moving contact bridge 330; First stationary contact 340; Second stationary contact 350; First auxiliary moving contact piece 360; First auxiliary stationary contact 370; Second contactor K2; second auxiliary contact group K2f; second electromagnetic system 410; second housing 420; second moving contact bridge 430; third stationary contact 440; fourth stationary contact 450; second auxiliary moving contact piece 460; second auxiliary stationary contact 470; Common housing 500; first connecting hole 501; second connecting hole 502; First common stationary contact 600; Second common stationary contact 700; Coil frame 810; Coil 820; Iron core sleeve 830; Moving iron core 840; Magnetic yoke 850; Return spring 860; Transmission assembly 870; Push assembly 880; Bracket 890. Detailed Implementation

[0027] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the fuse-embedded contactor of the present invention. The fuse-embedded contactor of the present invention is not limited to the embodiments described below.

[0028] like Figure 1-4 As shown, the fuse-embedded contactor of this 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 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. 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 outside the first housing 320. The first electromagnetic system 310 drives the first moving contact bridge 330 to make contact with the first stationary contact 340 and the second stationary contact 350 to conduct or disconnect. 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 extends into the second housing 420 and is disposed opposite to the two ends of the second moving 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 moving contact bridge 430 to make contact with the third stationary contact 440 and the fourth stationary contact 450 to conduct or disconnect.

[0029] Specifically, the fuse-embedded contactor of this embodiment 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. Figure 4 As shown, the first contactor K1, fuse FU, and second contactor K2 form a series circuit. Under normal conditions, the first contactor K1 and the second contactor K2 are disconnected, and the electrical clearance is twice that of a single contactor. Even if the contacts of one of the first contactors K1 and the second contactor K2 become stuck together, the other contactor K1 and the other contactor K2 can continue to operate, thus disconnecting the series circuit. If the probability of one contactor's contact sticking together is 0.1%, then the probability of both contactors' contacts sticking together simultaneously is 0.0001%, which is almost negligible. Therefore, the fuse-embedded contactor of this embodiment, by connecting the two contactors in series, can solve the risk of the circuit not being able to be disconnected due to contact sticking. The fuse-embedded contactor of this embodiment is preferably a DC contactor.

[0030] In this embodiment, the fuse-embedded contactor integrates the first contactor K1, the fuse FU, and the second contactor K2 into one unit and connects them in series. This reduces the number of connecting copper busbars and fuse bases between the devices, thereby reducing costs and space requirements. It also provides the functions of contactor conduction and disconnection under normal current and fuse melting under short-circuit current. Furthermore, it can solve the risk of the circuit not being able to be disconnected due to contact adhesion, thus improving safety and reliability.

[0031] Furthermore, the first contactor K1 in this embodiment also includes a first auxiliary contact group K1f. The first auxiliary contact group K1f 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 correspondingly disposed with the first conductive structure, while the other end extends out of the first housing 320. The first electromagnetic system 310 can drive the first moving contact bridge 330 to simultaneously drive the first conductive structure to turn on and off the two first auxiliary stationary contacts 370. Specifically, the first conductive structure includes two first auxiliary moving contact pieces 360 disposed one above the other. One end of each of the two first auxiliary moving contact pieces 360 is spaced apart and opposite to each other, and the other end of each of the two first auxiliary moving contact pieces 360 is connected to the end of each of the first auxiliary stationary contacts 370 that extends into the first housing 320. When the first electromagnetic system 310 drives the lower first auxiliary moving contact 360 to move upward and contact the upper first auxiliary moving contact 360, the two first auxiliary stationary contacts 370 are connected, that is, the first conducting structure connects the two first auxiliary stationary contacts 370; when the first electromagnetic system 310 drives the lower first auxiliary moving contact 360 to move downward and separate from the upper first auxiliary moving contact 360, the two first auxiliary stationary contacts 370 are disconnected, that is, the first conducting structure disconnects the two first auxiliary stationary contacts 370. The first contactor K1 has a first auxiliary contact group K1f with monitoring function. The first auxiliary moving contact 360 in the first auxiliary contact group K1f is mechanically linked with the first moving contact bridge 330, which can monitor the opening and closing state of the first contactor K1.

[0032] Of course, as another embodiment, the first conductive structure can also be a moving contact bridge structure, with its two ends respectively arranged at intervals opposite to the two first auxiliary stationary contacts 370. When the first electromagnetic system 310 drives the two ends of the first conductive structure to contact the two first auxiliary stationary contacts 370 respectively, the two first auxiliary stationary contacts 370 are connected; when the first electromagnetic system 310 drives the two ends of the first conductive structure to separate from the two first auxiliary stationary contacts 370 respectively, the two first auxiliary stationary contacts 370 are disconnected.

[0033] The second contactor K2 in this embodiment further includes a second auxiliary contact group K2f. The second auxiliary contact group K2f includes a second conductive structure disposed within 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 corresponds to the second conductive structure, while the other end extends out of the second housing 420. The second electromagnetic system 410 drives the second moving contact bridge 430 while simultaneously driving the second conductive structure to turn the two second auxiliary stationary contacts 470 on and off. Specifically, the second conductive structure includes two second auxiliary moving contact pieces 460 arranged one above the other. One end of each of the two second auxiliary moving contact pieces 460 is spaced apart and opposite to each other, and the other ends of each of the two second auxiliary moving contact pieces 460 are respectively connected to the end of each second auxiliary stationary contact 470 extending into the second housing 420. When the second electromagnetic system 410 drives the lower second auxiliary moving contact 460 to move upward and contact the upper second auxiliary moving contact 460, the two second auxiliary stationary contacts 470 are connected, that is, the second conducting structure connects the two second auxiliary stationary contacts 470; when the second electromagnetic system 410 drives the lower second auxiliary moving contact 460 to move downward and separate from the upper second auxiliary moving contact 460, the two second auxiliary stationary contacts 470 are disconnected, that is, the second conducting structure disconnects the two second auxiliary stationary contacts 470. The second contactor K2 has a second auxiliary contact group K2f with monitoring function. The second auxiliary moving contact 460 in the second auxiliary contact group K2f is mechanically linked with the second moving contact bridge 430, which can monitor the opening and closing state of the second contactor K2.

[0034] Of course, as another embodiment, the second conductive structure can also be a moving contact bridge structure, with its two ends respectively arranged at intervals opposite to the two second auxiliary stationary contacts 470. When the second electromagnetic system 410 drives the two ends of the second conductive structure to contact the two second auxiliary stationary contacts 470 respectively, the two second auxiliary stationary contacts 470 are connected; when the second electromagnetic system 410 drives the two ends of the second conductive structure to separate from the two second auxiliary stationary contacts 470 respectively, the two second auxiliary stationary contacts 470 are disconnected.

[0035] It should be noted that the first electromagnetic system 310 and the second electromagnetic system 410 in this embodiment are both prior art, and can be found in reference to [other technologies]. Figure 3 and Figure 18 It typically includes 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 within 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, a return spring 860 connecting the movable iron core 840 and the magnetic yoke 850, a transmission assembly 870, and a pushing assembly 880. The movable iron core 840 is connected to the transmission assembly 870, and the transmission assembly 870 and the pushing assembly 880 are driven together. A bracket 890 is provided on the magnetic yoke 850. When the coil 820 is energized, the moving iron core 840 moves upward and engages with the magnetic yoke 850. The moving iron core 840 drives the transmission component 870 to move upward, and the transmission component 870 drives the push component 880 to move upward. When the coil 820 is not energized, the reset spring 860 drives the moving iron core 840 to move downward and repel the magnetic yoke 850. The moving iron core 840 drives the transmission component 870 to move downward, and the transmission component 870 drives the push component 880 to move downward.

[0036] In this embodiment, the first cover 320 of the common cover 500 is fixedly connected to the yoke 850 of the first electromagnetic system 310 by welding to form a sealed space between the first cover 320 and the yoke 850 of the first electromagnetic system 310; the first moving contact bridge 330 is disposed on the transmission component 870 of the first electromagnetic system 310, and the transmission component 870 of the first electromagnetic system 310 is located inside the first cover 320; the lower first auxiliary moving contact piece 360 ​​is disposed on the bracket 890 of the first electromagnetic system 310 and drives and cooperates with the push component 880; the moving iron core 840 of the first electromagnetic system 310 passes through the transmission component 870 and the push component 880 in sequence, driving the lower first auxiliary moving contact piece 360 ​​to contact and separate from the upper first auxiliary moving contact piece 360. The second cover 420 of the shared cover 500 is fixedly connected to the yoke 850 of the second electromagnetic system 410 by welding to form a sealed space between the second cover 420 and the yoke 850 of the second electromagnetic system 410; the second moving contact bridge 430 is disposed on the transmission component 870 of the second electromagnetic system 410, and the transmission component 870 of the second electromagnetic system 410 is located inside the second cover 420; the lower second auxiliary moving contact piece 460 is disposed on the bracket 890 of the second electromagnetic system 410 and drives and cooperates with the push component 880; the moving iron core 840 of the second electromagnetic system 410 passes through the transmission component 870 and the push component 880 in sequence, driving the lower second auxiliary moving contact piece 460 to contact and separate from the upper second auxiliary moving contact piece 460.

[0037] like Figure 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.

[0038] 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.

[0039] 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.

[0040] like Figure 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.

[0041] 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.

[0042] 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.

[0043] like Figure 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.

[0044] 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.

[0045] 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.

[0046] Preferably, the second stationary contact 350 and the first fuse stationary contact 120 are integrally connected to form a first common stationary contact 600; 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 housing 320 through the first connecting hole 501 of the common housing 500, and then the first common stationary contact 600 is welded to the common housing 500; the fourth stationary contact 450 of the second common stationary contact 700 is inserted into the second housing 420 through the second connecting hole 502 of the common housing 500, and then the second common stationary contact 700 is welded to the common housing 500; the first connecting end 142 of the fusible element 140 is welded to the first fuse stationary contact 120 of the first common stationary contact 600, and the second connecting end 143 of the fusible element 140 is welded to the second fuse stationary contact 130 of the second common stationary contact 700. By integrating the first housing 320, the third housing 111, and the second housing 420 into a common housing 500, and integrating the second stationary contact 350 and the first fuse stationary contact 120 into a first common stationary contact 600, and integrating the second fuse stationary contact 130 and the fourth stationary contact 450 into a second common stationary contact 700, all brazing is completed in the same process, simplifying the manufacturing process, improving efficiency, and reducing costs. Making the contactor's stationary contact and the fuse FU's stationary contact into one unit reduces the number of stationary contacts, eliminates the welding process between two stationary contacts, simplifies installation, and makes the integrated connection more reliable.

[0047] In this embodiment, the second stationary contact 350 and the fourth stationary contact 450 have the same structure and are symmetrically arranged, with their plane of symmetry perpendicular to the first direction. Both the second stationary contact 350 and the fourth stationary contact 450 are flat plate structures arranged perpendicular to the second direction. Unlike the first stationary contact 340 and the third stationary contact 440, which adopt traditional cylindrical structures, the second stationary contact 350 and the fourth stationary contact 450 in this embodiment adopt flat plate structures, which facilitates integrated design with the first fuse stationary contact 120 and the second fuse stationary contact 130, respectively.

[0048] like Figure 3As shown, the connection structure between the fusible element 140 and the first fuse stationary contact 120 and the second fuse stationary contact 130 in this embodiment is such 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. Both the first fuse stationary contact 120 and the second fuse stationary contact 130 are flat plate structures arranged perpendicular to the first direction. One side of the first fuse stationary contact 120 in the first direction is used for electrical connection with the second stationary contact 350, and one side of the second fuse stationary contact 130 in the first direction is used for electrical connection with the fourth stationary contact 450. The fusible element 140 is located between the first fuse stationary contact 120 and the second fuse stationary contact 130 in the first direction. The first connecting end 142 of 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 second connecting end 143 of 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.

[0049] In this embodiment, the first fuse stationary contact 120 and the second stationary contact 350 of the plate are connected in a T-shape, and the second fuse stationary contact 130 and the fourth stationary contact 450 of the plate are connected in a T-shape. That is, the first common stationary contact 600 and the second common stationary contact 700 have the same structure and are symmetrically arranged, and their symmetry plane is perpendicular to the first direction. Both the first common stationary contact 600 and the second common stationary contact 700 have a T-shaped structure.

[0050] 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.

[0051] like Figure 1-3As shown, the fuse FU in this embodiment also includes an indicator 200. The indicator 200 in this embodiment includes an indicator 210, an elastic element, a limiting element, and a fuse 230. The fuse 230 of the indicator 200 is disposed within the third housing 111 and connected in series between the first fuse stationary contact 120 and the second fuse stationary contact 130. The indicator 210 is movably disposed, capable of moving 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 tension of the fuse 230 constrains the limiting element, causing the limiting element to restrict the indicator 210, thus keeping the indicator 210 in the initial position against the force of the elastic element. When the fuse 230 blows due to overcurrent or short circuit, the fuse 230 loses its tension and can no longer constrain the limiting element, thereby releasing energy from the elastic element and driving the indicator 210 to move from the initial position to the indicated position. It should be noted that the resistance of fuse 230 is greater than that of fuse element 140. Under normal conditions, almost no current flows through fuse 230. When there is an overcurrent or short circuit, fuse element 140 will melt first, and then the current will flow through fuse 230, causing fuse 230 to melt.

[0052] For details, please refer to Figure 10-11 The third cover 111 is provided with a fuse housing groove 1111 on the outside of the third cover 111 and a fuse housing through hole 1112 connecting the fuse housing groove 1111 and the interior of the third cover 111.

[0053] refer to Figure 10-12 In this embodiment, the indicator 210 of the indicator 200 is movably disposed within the fuse housing recess 1111. The indicator 210 includes an indicator body 211 and an indicator piece 212. The indicator piece 212 is stacked on the indicator body 211, and its size is larger than that of the indicator body 211. An indicator boss 213 protrudes from the surface of the indicator body 211 opposite to the indicator piece 212, and at least one annular groove 214 is provided on the indicator boss 213. The annular groove 214 on the indicator boss 213 increases the creepage distance. The indicator body 211 is preferably cylindrical, but can also be square or other shaped cylindrical structures; the indicator piece 212 is preferably circular, but can also be square or other shaped sheet structures. The indicator piece 212 may be provided with an indicator mark, which can be one or more combinations of color, text, and graphics.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] like Figure 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.

[0059] 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 third 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. This embodiment of the fuse-embedded contactor layout is more compact, which can greatly reduce the product length and is suitable for more application scenarios, especially those with limited length or special requirements for product shape.

[0060] In this embodiment, the first cover 320 and the second cover 420 are respectively vertically and integrally connected to the two ends of the third cover 111 in the first direction to form a U-shaped common cover 500.

[0061] like Figure 8 The diagram shows a third embodiment of a fuse-embedded contactor. The difference from the first embodiment lies in the connection structure between the fuse element 140 and the first and second fuse stationary contacts 120 and 130. In this embodiment, the first and second fuse stationary contacts 120 and 130 have identical structures and are symmetrically arranged, with their plane of symmetry perpendicular to the first direction. Both the first and second fuse stationary contacts 120 and 130 are T-shaped structures, including a transverse portion perpendicular to the second direction and a longitudinal portion perpendicular to the first direction. The side of the longitudinal portion of the first fuse stationary contact 120 facing away from the transverse portion is used for electrical connection with the second stationary contact 350, and the side of the longitudinal portion of the second fuse stationary contact 130 facing away from the transverse portion is used for electrical connection with the fourth stationary contact 450.

[0062] The fusible element 140 is located in a first direction between the first fuse stationary contact 120 and the second fuse stationary contact 130. The first connecting end 142 of one end of the fusible element 140 is connected to the side of the lateral portion of the first fuse stationary contact 120 away from the longitudinal portion, and the second connecting end 143 of the other end of the fusible element 140 is connected to the side of the lateral portion of the second fuse stationary contact 130 away from the longitudinal portion.

[0063] In this embodiment, the T-shaped first fuse stationary contact 120 and the flat second stationary contact 350 are connected in a cross shape, and the T-shaped second fuse stationary contact 130 and the flat fourth stationary contact 450 are connected in a cross shape. That is, the first common stationary contact 600 and the second common stationary contact 700 have the same structure and are symmetrically arranged, and their symmetry plane is perpendicular to the first direction. Both the first common stationary contact 600 and the second common stationary contact 700 have a cross-shaped structure.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] like Figure 10-13The image shows a fifth embodiment of a fuse-embedded contactor. The difference from the first embodiment is that the elastic element of the indicator 200 in this embodiment is a spring. The spring includes a spring connecting part and a spring energy storage structure for energy storage. The spring connecting part and the hook connecting part 223 are integrally injection molded into the indicator 210. The spring of the indicator 200 is disposed within the fuse housing groove 1111, and its spring energy storage structure abuts against the bottom wall of the fuse housing groove 1111. In this embodiment, the fuse and its indicator are injection molded together with the spring and hook 220 into the indicator 210, which has a simple structure, reduces production steps, eliminates the need for further assembly, and reduces material and assembly costs. Moreover, the spring, hook 220 and indicator 210 are injection molded as a whole and hooked onto the fuse 230 by the hook part 221, which makes assembly easy. The fuse 230 of the indicator 200, together with the integrated spring, hook 220 and indicator 210, can be assembled in the fuse in separate modules, making installation more flexible and simple. The indicator 200 has a wide range of applications and is more suitable for the application scenarios of contactors with built-in fuses.

[0068] like Figure 12-13 As shown, the spring contact part is an annular sheet structure, and its center line coincides with or is parallel to the center line of the indicator 210. The annular sheet structure of the spring contact part used for injection molding with the indicator 210 makes the integral connection between the spring contact and the indicator 210 more secure. The spring contact part is preferably a circular annular sheet, but it can also be a square annular sheet or other annular sheet structures.

[0069] Furthermore, the spring-loaded energy storage structure includes multiple elastic energy storage units, which are respectively connected to the spring-loaded connecting unit and arranged around the center line of the spring-loaded connecting unit. The spring-loaded energy storage structure is formed by multiple elastic energy storage units arranged around each other, which is simple in structure and facilitates the compression and storage of energy by each elastic energy storage unit to jointly drive the indicator 210 to pop out, making the indication of the indicator 210 more reliable.

[0070] Specifically, in this embodiment, the spring is a first spring 240. The first spring 240 includes a first annular piece 241 as the spring connecting part and a plurality of first elastic feet 242 as the elastic energy storage part. That is, the spring energy storage structure of this embodiment is formed by a plurality of first elastic feet 242 surrounding the center line of the first annular piece 241. The first annular piece 241 has a first spring through hole 2411.

[0071] Each first elastic leg 242 includes a first elastic leg segment 2421, a first elastic leg segment 2422, and a first elastic leg segment 2423, which are bent and connected in sequence. The first elastic leg segment 2421 is connected to the outer side of the first annular piece 241 and is flush with the first annular piece 241. The first elastic leg segment 2422 is inclined away from the center line of the first annular piece 241, and is bent away from the center line of the first annular piece 241 to form the first elastic leg segment 2423. The first elastic leg segment 2423 is perpendicular to the center line of the first annular piece 241. In this embodiment, the first elastic leg segment 2423 of each first elastic leg 242 in the spring energy storage structure abuts against the bottom wall of the fuse housing groove 1111. In this embodiment, the first spring piece 240 has an outward hook structure for the first elastic leg 242, which is simple in structure, easy to form, and extends outward when compressed, making it easier to compress and store energy.

[0072] In this embodiment, the outer diameter of the first annular piece 241 is smaller than the outer diameter of the indicator body 211, and the end of the first elastic foot segment 2421 connected to the first annular piece 241 is injection molded together with the first annular piece 241 into the indicator body 211.

[0073] like Figure 14 The image shows a sixth embodiment of a fuse-embedded contactor, differing from the fifth embodiment in the structure of the spring contact of the indicator 200. In this embodiment, the spring contact is a second spring contact 250, which includes a second annular piece 251 serving as the spring contact connecting portion and a plurality of second elastic legs 252 serving as the elastic energy storage portion. That is, the spring contact energy storage structure in this embodiment is formed by a plurality of second elastic legs 252 arranged around the center line of the second annular piece 251; the second annular piece 251 has a second spring contact through hole 2511.

[0074] Each second elastic leg 252 includes a second elastic leg segment 2521, a second elastic leg segment 2522, and a second elastic leg segment 2523, which are bent and connected in sequence. The second elastic leg segment 2521 is connected to the outer side of the second annular piece 251 and is flush with the second annular piece 251. The second elastic leg segment 2522 is inclined towards the center line of the second annular piece 251, and is bent towards the center line of the second annular piece 251 to form the second elastic leg segment 2523, which is perpendicular to the center line of the second annular piece 251. In this embodiment, the second elastic leg segment 2523 of each second elastic leg 252 in the spring energy storage structure abuts against the bottom wall of the fuse housing groove 1111. In this embodiment, the second elastic leg 252 of the second spring 250 has an inward hook structure, which extends inward when compressed, saving space.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In this embodiment, the third annular piece 261 is injection molded into the indicator piece 212.

[0079] 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.

[0080] The fourth elastic foot 272 is a bent structure with a notch facing the center line of the fourth annular piece 271. One end of the fourth elastic foot 272 is bent and connected to the outer side of the fourth annular piece 271, and the other end is bent and connected to the outer side of the connecting annular piece 273. Multiple fourth elastic feet 272 are respectively connected to the connecting annular piece 273 to form the spring-loaded energy storage structure of this embodiment. The connecting annular piece 273 of the spring-loaded energy storage structure of this embodiment abuts against the bottom wall of the fuse housing groove 1111. The fourth elastic foot 272 is preferably a curved, U-shaped, V-shaped, or other shaped bent structure. The fourth spring piece 270 of this embodiment is formed by two layers of annular pieces and a compressible energy-storing fourth elastic foot 272 located in the middle, which improves the synchronization of energy storage compression among the various fourth elastic feet 272.

[0081] In this embodiment, the fourth annular piece 271 is injection molded into the indicator piece 212.

[0082] like Figure 17 The diagram shows a ninth embodiment of a fuse-embedded contactor, differing from the fifth embodiment in the structure of the spring contact of the indicator 200. In this embodiment, the spring contact is a fifth spring contact 280, which includes a fifth annular piece 281 serving as the spring contact connecting portion and a plurality of fifth elastic legs 282 serving as the elastic energy storage portion. That is, the spring contact energy storage structure in this embodiment is formed by a plurality of fifth elastic legs 282 arranged around the center line of the fifth annular piece 281; the fifth annular piece 281 has a fifth spring contact through hole 2811.

[0083] Each fifth elastic leg 282 includes a fifth elastic leg segment 2821, which is a bent structure with a notch facing the center line of the fifth annular piece 281. One end of the fifth elastic leg segment 2821 is bent and connected to the outer side of the fifth annular piece 281, and the other end is bent away from the center line of the fifth annular piece 281 to form a fifth elastic leg second segment 2822, which is perpendicular to the center line of the fifth annular piece 281. In this embodiment, the fifth elastic leg second segment 2822 of each fifth elastic leg 282 in the spring energy storage structure abuts against the bottom wall of the fuse housing groove 1111. The fifth elastic leg segment 2821 is preferably a curved, U-shaped, V-shaped or other shaped bent structure. In this embodiment, the fifth elastic leg 282 of the fifth spring 280 has an inward hook structure for the fifth elastic leg segment 2821, which is bent outward to form the fifth elastic leg second segment 2822, saving space and allowing it to extend outward during compression, making it easier to compress and store energy.

[0084] In this embodiment, the fifth annular piece 281 is injection molded into the indicator piece 212.

[0085] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0086] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

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.

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 or 2, characterized in that: 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. 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 first direction and the second direction are perpendicular to each other.

4. The fuse-embedded contactor according to claim 3, characterized in that: The first cover (320), the third cover (111), and the second cover (420) are sequentially and integrally connected along the first direction to form a single-line common cover (500).

5. The fuse-embedded contactor according to claim 1 or 2, characterized in that: 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.

6. The fuse-embedded contactor according to claim 5, 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.

7. 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).

8. The fuse-embedded contactor according to claim 1 or 7, 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.

9. The fuse-embedded contactor according to claim 1 or 7, 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).

10. 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).

11. 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).

12. 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).

13. The fuse-embedded contactor according to claim 12, 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).

14. 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.

Images