Loop structure and switching device

Abstract

The utility model discloses a loop structure and a switching device, which comprises a current-carrying loop and a breaking loop connected in parallel with the current-carrying loop, a current-carrying contact of the switching device is arranged on the current-carrying loop, and a breaking contact for breaking current is arranged on the breaking loop. And the breaking contact is configured to perform breaking at the current-carrying contact in the opening process of the switching device, so that the current of the loop is subjected to breaking operation by the breaking contact. According to the utility model, the breaking loop connected in parallel with the current-carrying loop is arranged, and the breaking contact on the breaking loop is used for breaking current, so that the switching device can better meet the requirement of 2000V or even higher voltage.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switch device, concretely relates to a loop structure and switch device. BACKGROUND

[0002] With the development of new energy technology, especially the development of photovoltaic power generation and energy storage technology, the system voltage gradually increases from the initial 500V to the current 1500V, and further develops to 2000V, 2500V, 3000V and higher levels in the future. Therefore, the rated operating voltage requirement of disconnecting switches in photovoltaic inverters, energy storage converters and busbar cabinets for new energy is also increasing, and the current has developed to Ue=1500V 2-pole, and the rated current increases from 1600A to 4000A. For working conditions exceeding 1500V, a 4-pole method is needed to solve the problem, and the cost economy of the 4-pole switch is 30-40% higher than that of the 2-pole switch. At the same time, the use amount of copper-silver noble metal, product volume, contact synchronous reliability, power consumption, temperature rise and other problems are significantly worse than those of the 2-pole switch. Therefore, there is an urgent need for a 2-pole switch to realize Ue=2000V and higher voltage switch device products. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides a kind of loop structure, by being connected in parallel with the current-carrying loop of the breaking circuit, the breaking current is broken by the breaking contact on the breaking circuit, so that switch device can better meet the voltage requirement of 2000V or even higher.

[0004] To achieve the above purpose, the utility model is realized by the following technical scheme:

[0005] A kind of loop structure is applied to switch device, including current-carrying loop and the breaking circuit connected in parallel with current-carrying loop, the current-carrying contact of switch device is arranged on current-carrying loop, the breaking contact for breaking current is arranged on breaking circuit, and the breaking contact is configured to break behind current-carrying contact during switch device breaking process, to make the current of loop be broken by breaking contact.

[0006] Further, the current-carrying contact and the breaking contact are configured to be arranged in two installation spaces that are mutually isolated at least arc region, preferably, in current-carrying loop and breaking circuit, at least the arc chamber is arranged corresponding to breaking circuit, and the breaking contact is configured to be arranged in arc chamber.

[0007] Further, the breaking circuit is connected in series with the resistance limiting current device for limiting current in breaking circuit;

[0008] Further, the resistance limiting current device is resistance or connection plate structure with high resistance value.

[0009] Further, the breaking contact is a single-break structure or a multi-break structure.

[0010] Further, the current-carrying contact and the breaking contact are configured to be linked with a driving rotating shaft of the switch electric appliance through a current-carrying contact linkage mechanism and a breaking contact linkage mechanism respectively, the current-carrying contact is controlled to act by the current-carrying contact linkage mechanism under the driving of the driving rotating shaft, and then the closing state and the breaking state of the current-carrying contact are switched, the breaking contact is controlled to act by the breaking contact linkage mechanism under the driving of the driving rotating shaft, and then the closing state and the breaking state of the breaking contact are switched.

[0011] Further, the current-carrying contact comprises a current-carrying moving contact part and a current-carrying static contact part arranged correspondingly to the current-carrying moving contact part, the breaking contact comprises a breaking moving contact part and a breaking static contact part arranged correspondingly to the breaking moving contact part, the current-carrying contact linkage mechanism comprises a first cantilever fixedly connected with the driving rotating shaft, and the free end of the first cantilever and the current-carrying moving contact part are connected through a first connecting rod, the breaking contact linkage mechanism comprises a second cantilever fixedly connected with the driving rotating shaft, and the free end of the second cantilever and the breaking moving contact part are connected through a second connecting rod.

[0012] Further, during the closing process of the switch electric appliance, the breaking contact is configured to be closed prior to the current-carrying contact.

[0013] Further, when the closing operation of the switch electric appliance is completed, the current-carrying contact and the breaking contact are both in the closed state.

[0014] Further, when the closing operation of the switch electric appliance is completed, the current-carrying contact is in the closed state, and the breaking contact is in the breaking state.

[0015] Further, the breaking moving contact part comprises a contact support rotating around a rotating shaft A, the contact support is connected with the second connecting rod of the breaking contact linkage mechanism, a contact piece rotating around a rotating shaft B is connected to the contact support, a breaking moving contact point for contact matching with the breaking static contact part is arranged on the contact piece, an elastic reset member for making the breaking moving contact point elastically abut against the breaking static contact part is arranged between the contact piece and the contact support, and an abutting part is arranged on the part of the contact piece between the rotating shaft B and the breaking moving contact point, a limiting part is further fixedly arranged in the installation space of the breaking contact, when the abutting part and the limiting part abut against each other, the abutting part forms a lever fulcrum structure of the contact piece, so that when the contact support continues to act under the control of the breaking contact linkage mechanism, the end of the contact piece provided with the breaking moving contact point is lifted up and then disconnected from the breaking static contact part.

[0016] Further, the limiting part is connected to the breaking static contact part, and at least one of the limiting part and the abutting part is a non-conductive structure.

[0017] Based on the same inventive concept, the utility model still provides a kind of switch device, including the loop structure of any one described above, and the switch device is disconnecting switch or circuit breaker.

[0018] The above technical solution has the following advantages or beneficial effects:

[0019] The loop structure and switch device, the breaking circuit is additionally arranged in parallel with the current-carrying circuit based on the original current-carrying circuit of the switch device, and the breaking contact is arranged on the breaking circuit, and in use, the current-carrying contact of the current-carrying circuit does not break the current, but the breaking contact on the breaking circuit breaks the current in the loop structure, so the current-carrying contact of the current-carrying circuit does not produce the arc phenomenon, and when breaking the current, only the arc is generated at the breaking contact of the breaking circuit, and since the current-carrying contact and the breaking contact are arranged in two completely isolated mounting spaces respectively, the high-temperature and high-pressure gas, arc, high-temperature particles and the like in the mounting space of the breaking contact can be effectively prevented from entering the mounting space of the current-carrying contact, the arc is prevented from reigniting in the current-carrying circuit, the arc time is effectively shortened, and the arc energy is reduced. Moreover, since the current-carrying circuit does not arc, the volume of the silver point of the current-carrying contact can be greatly reduced, the amount of silver is effectively saved, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the principle block diagram of the loop structure of the utility model embodiment one in the closing process of switch device.

[0021] Figure 2 is the principle block diagram of the loop structure of the utility model embodiment one when closing of switch device is completed (the breaking contact is closed).

[0022] Figure 3 is the principle block diagram of the loop structure of the utility model embodiment one in the opening process of switch device.

[0023] Figure 4 is the principle block diagram of the loop structure of the utility model embodiment one when opening of switch device is completed.

[0024] Figure 5 is the structure schematic view of the loop structure of the utility model embodiment one.

[0025] Figure 6 is the structure schematic view of the loop structure of the utility model embodiment two.

[0026] Figure 7 is the structure schematic view when the breaking contact of the utility model embodiment three is closed.

[0027] Figure 8Is the breaking contact of the embodiment three of the utility model in the closing of the switch device closing process again breaking structure schematic diagram.

[0028] Figure 9 Is the circuit structure of the embodiment three of the utility model when the switch device closing is completed principle block diagram (breaking contact is disconnected).

[0029] Label explanation:

[0030] 1, current-carrying circuit, 2, breaking circuit, 3, current-carrying contact, 4, breaking contact, 5, arc chamber, 6, resistance limiting current element, 7, current-carrying contact linkage mechanism, 8, breaking contact linkage mechanism, 9, drive shaft, 31, current-carrying moving contact part, 32, current-carrying static contact, 41, breaking moving contact part, 42, breaking static contact, 43, limiting part, 71, first cantilever, 72, first connecting rod, 81, second cantilever, 82, second connecting rod, 411, contact support, 412, contact piece, 413, breaking moving contact, 414, abutting part. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with the drawings and examples.

[0032] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0033] Example one

[0034] Please refer to the attached Figure 1 to the attached Figure 5The utility model discloses a kind of loop structures, applied to switch device, including current-carrying loop 1 and the parallelly connected setting breaking circuit 2 of current-carrying loop 1, the current-carrying contact 3 of switch device is set on current-carrying loop 1, breaking contact 4 for breaking current is set on breaking circuit 2, and breaking contact 4 is configured to be broken in switch device breaking process behind current-carrying contact 3, to make the current of loop by breaking contact 4 breaking operation.It can be understood that, in the embodiment, on the basis of the original current-carrying loop 1 of switch device, breaking circuit 2 is additionally arranged in parallel with current-carrying loop 1, and breaking contact 4 is arranged on breaking circuit 2, when using, the current-carrying contact 3 of current-carrying loop 1 is no longer broken current, but by breaking contact 4 on breaking circuit 2 to the current in loop structure is disconnected, therefore, the current-carrying contact 3 of current-carrying loop 1 will not produce arc phenomenon, when breaking current, only breaking contact 4 of breaking circuit 2 produces arc, can effectively improve the ultimate breaking capacity of current-carrying contact to make switch device can better satisfy 2000V even higher voltage requirement.And, because current-carrying loop does not arc, therefore, the volume of silver dot of current-carrying contact 3 can be greatly reduced, effectively save silver amount, be favorable to reducing production cost.

[0035] Please refer to the attached drawings Figure 5 In one preferred embodiment, the current-carrying contact 3 and the breaking contact 4 are configured to be arranged in two installation spaces that are mutually isolated in at least the arc area, and the non-arc areas of the two installation spaces can be mutually isolated or interconnected or partially interconnected. Preferably, in the current-carrying loop 1 and the breaking circuit 2, only the arc chamber 5 can be arranged corresponding to the breaking circuit 2, and the breaking contact 4 is arranged in the arc chamber 5 (or arc extinguishing system). Since the current-carrying contact 3 and the breaking contact 4 are arranged in two completely isolated installation spaces, the high-temperature and high-pressure gas, arc, high-temperature particles, etc. in the installation space of the breaking contact 4 can be effectively prevented from entering the installation space of the current-carrying contact 3, the arc in the current-carrying loop is avoided from reigniting, and the arc time is effectively shortened and the arc energy is reduced. However, those skilled in the art should understand that, in other embodiments, the arc chamber structure corresponding to the current-carrying contact 3 can also be arranged in the current-carrying loop 1 as needed.

[0036] Please refer to the attached drawings Figure 1 to the attached drawings Figure 4In one preferred embodiment, the breaking circuit 2 is connected in series with a resistance limiting current device 6 for limiting the current in the breaking circuit 2. By connecting the resistance limiting current device 6, the arc voltage between the breaking circuit and the breaking contact 4 is effectively increased, and the current is limited, which is conducive to extinguishing AC and DC arcs with a voltage of 2000V or higher. In one preferred embodiment, the resistance of the breaking circuit is preferably 10 times or more than the resistance of the current-carrying circuit by using a resistance or a connection plate structure with a high resistance. In this embodiment, when the resistance limiting current device 6 is a connection plate structure, it is made of a material with a large resistance rate, such as constantan. The connection plate structure has a small cross section and a certain length, which not only conducts the breaking circuit but also provides a large resistance in the breaking circuit, thereby limiting the current in the breaking circuit.

[0037] Please refer to the accompanying drawings Figure 5 In one preferred embodiment, the breaking contact 4 has a single breaking point structure.

[0038] Please refer to the accompanying drawings Figure 5 In one preferred embodiment, the current-carrying contact 3 and the breaking contact 4 are configured to be connected to the driving shaft 9 of the switch electric appliance through the current-carrying contact linkage mechanism 7 and the breaking contact linkage mechanism 8, respectively. The current-carrying contact 3 is controlled to act by the current-carrying contact linkage mechanism 7 under the driving of the driving shaft 9, thereby switching the closed state and the breaking state of the current-carrying contact 3. The breaking contact 4 is controlled to act by the breaking contact linkage mechanism 8 under the driving of the driving shaft 9, thereby switching the closed state and the breaking state of the breaking contact 4. During the opening of the switch electric appliance, the breaking contact 4 is configured to break after the current-carrying contact 3, so that the current in the circuit is broken by the breaking contact 4. It can be understood that since the breaking contact 4 is configured to break after the current-carrying contact 3, when the switch electric appliance is opened, the current-carrying contact 3 is first disconnected, and the current flows through the breaking circuit 2. When the driving shaft 9 of the switch electric appliance rotates by a certain angle, the breaking contact 4 is then disconnected, thereby breaking the current in the circuit by the breaking contact 4. Therefore, when the switch electric appliance is opened, no arc is generated at the current-carrying contact 3, which effectively improves the limit breaking capacity of the current-carrying circuit 1, so that the switch electric appliance can better meet the voltage requirement of 2000V or higher.

[0039] Please refer to the accompanying drawings Figure 5In one preferred embodiment, the current-carrying contact 3 comprises a current-carrying moving contact part 31 and a current-carrying stationary contact part 32 corresponding to the current-carrying moving contact part 31, the breaking contact 4 comprises a breaking moving contact part 41 and a breaking stationary contact part 42 corresponding to the breaking moving contact part 41, and the current-carrying contact linkage mechanism 7 comprises a first cantilever 71 fixedly connected to the driving shaft 9, and the free end of the first cantilever 71 is connected to the current-carrying moving contact part 31 through a first connecting rod 72, and the breaking contact linkage mechanism 8 comprises a second cantilever 81 fixedly connected to the driving shaft 9, and the free end of the second cantilever 81 is connected to the breaking moving contact part 41 through a second connecting rod 82. In this embodiment, in order to realize that the breaking contact 4 lags behind the current-carrying contact 3 during the breaking of the switch device, the length, position, shaft position, etc. of the second cantilever 81 and the second connecting rod 82 corresponding to the breaking circuit 2 can be configured to be different from the corresponding structures of the current-carrying circuit 1, so that the rotation angle and rotation speed of the breaking moving contact part 41 and the current-carrying moving contact part 31 are different, thereby realizing that the breaking contact 4 lags behind the current-carrying contact 3 during the breaking of the switch device. However, those skilled in the art should understand that, in other embodiments, in order to realize that the breaking contact 4 lags behind the current-carrying contact 3 during the breaking of the switch device, other conventional methods can also be used, and the specific embodiments disclosed in this embodiment are not limited, for example, the breaking gap of the current-carrying contact 3 can be configured to be larger than the breaking gap of the breaking contact 4, and at least the breaking contact 4 is provided with a breaking contact closing overtravel structure. In this way, during the closing of the switch device, after the driving shaft 9 rotates by a certain angle, the breaking contact 4 will close first due to the small breaking gap, and then the driving shaft 9 continues to rotate, and the breaking contact 4 enters the overtravel action range until the current-carrying contact 3 is closed. Conversely, during the breaking of the switch device, the driving shaft 9 rotates reversely, the current-carrying contact 3 is disconnected first, and the breaking contact 4 is still in the overtravel action range, so that the breaking contact 4 remains closed when the current-carrying contact 3 is disconnected. In this way, the effect that the breaking contact 4 lags behind the current-carrying contact 3 during the breaking of the switch device is achieved.

[0040] Please refer to the accompanying drawings Figure 5 In one preferred embodiment, during the closing of the switch device, the breaking contact 4 is configured to close first than the current-carrying contact 3, and when the closing operation of the switch device is completed, the current-carrying contact 3 and the breaking contact 4 are both in a closed state.

[0041] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 5 In one embodiment of the utility model, a switch device comprising the circuit structure of any one of the above embodiments is also provided. The switch device is a disconnector or a circuit breaker. However, those skilled in the art should understand that, in other embodiments, the switch device can also be other switch device structures that require arc extinction.

[0042] Embodiment two

[0043] Please refer to the accompanying drawings Figure 6 The difference between this embodiment and embodiment one is that the breaking contact 4 is a multi-break structure, and preferably, the breaking contact 4 is a double-break structure.

[0044] Embodiment three

[0045] Please refer to the accompanying drawings Figure 7 to the accompanying drawings Figure 9 The difference between this embodiment and embodiment one is that when the switch completes the closing operation, the current-carrying contact 3 is in a closed state, and the breaking contact 4 is in a breaking state.

[0046] Please refer to the accompanying drawings Figure 7 to the accompanying drawings Figure 9 In one preferred embodiment, the breaking moving contact part 41 comprises a contact support 411 rotating around a rotating shaft A, the contact support 411 is connected with the second connecting rod 82 of the breaking contact linkage mechanism 8, and a contact piece 412 rotating around a rotating shaft B is rotationally connected to the contact support 411, the contact piece 412 is provided with a breaking moving contact point 413 for contact matching with the breaking stationary contact 42, and an elastic reset member is arranged between the contact piece 412 and the contact support 411 for making the breaking moving contact point 413 elastically abut against the breaking stationary contact 42, and the contact piece 412 is provided with an abutting portion 414 on the portion between the rotating shaft B and the breaking moving contact point 413, and a limiting portion 43 is fixedly arranged in the installation space of the breaking contact 4, when the abutting portion 414 and the limiting portion 43 abut against each other, the abutting portion 414 forms a lever fulcrum structure of the contact piece 412, so that when the contact support 411 continues to act under the control of the breaking contact linkage mechanism 8, one end of the contact piece 412 provided with the breaking moving contact point 413 will be raised and disconnected from the breaking stationary contact 42; the limiting portion 43 is connected to the breaking stationary contact 42, and at least one of the limiting portion 43 and the abutting portion 414 is a non-conductive structure.

[0047] The above description is only used to illustrate the technical solutions of the present application, and is not a limitation thereof; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, therefore, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

Claims

1. A circuit structure applied in a switchgear, characterized in that: The circuit includes a current-carrying circuit (1) and a breaking circuit (2) arranged in parallel with the current-carrying circuit (1), a current-carrying contact (3) of a switching device is arranged on the current-carrying circuit (1), a breaking contact (4) for breaking current is arranged on the breaking circuit (2), and the breaking contact (4) is configured to break after the current-carrying contact (3) during switching-off of the switching device, so that the current of the circuit is broken by the breaking contact (4).

2. The circuit arrangement according to claim 1, characterized in that: The current-carrying contact (3) and the breaking contact (4) are arranged in two installation spaces that are isolated from each other at least in the arc region.

3. - Circuit arrangement according to claim 2, characterized in that: An arc-extinguishing chamber (5) is arranged in the current-carrying circuit (1) and the breaking circuit (2), and the breaking contact (4) is arranged in the arc-extinguishing chamber (5).

4. The circuit structure according to claim 1, characterized in that: A resistance or a connection plate structure with high resistance is arranged in series in the breaking circuit (2) to limit the current in the breaking circuit (2).

5. The circuit structure according to claim 1, characterized in that: The breaking contact (4) is a single-breakpoint structure or a multi-breakpoint structure.

6. - Circuit structure according to any of claims 1 to 5, characterized in that: The current-carrying contact (3) and the breaking contact (4) are connected to a driving shaft (9) of the switching device through a current-carrying contact linkage mechanism (7) and a breaking contact linkage mechanism (8) respectively, the current-carrying contact (3) is controlled to move by the current-carrying contact linkage mechanism (7) under the driving of the driving shaft (9), so as to switch the closing state and the breaking state of the current-carrying contact (3), and the breaking contact (4) is controlled to move by the breaking contact linkage mechanism (8) under the driving of the driving shaft (9), so as to switch the closing state and the breaking state of the breaking contact (4).

7. - Circuit arrangement according to claim 6, characterized in that: The current-carrying contact (3) includes a current-carrying movable contact part (31) and a current-carrying fixed contact (32) arranged corresponding to the current-carrying movable contact part (31), the breaking contact (4) includes a breaking movable contact part (41) and a breaking fixed contact (42) arranged corresponding to the breaking movable contact part (41), the current-carrying contact linkage mechanism (7) includes a first cantilever (71) fixedly connected to the driving shaft (9), and the free end of the first cantilever (71) is connected to the current-carrying movable contact part (31) through a first connecting rod (72), and the breaking contact linkage mechanism (8) includes a second cantilever (81) fixedly connected to the driving shaft (9), and the free end of the second cantilever (81) is connected to the breaking movable contact part (41) through a second connecting rod (82).

8. The circuit structure according to claim 6, characterized in that: During closing of the switching device, the breaking contact (4) is configured to be closed before the current-carrying contact (3).

9. - Circuit structure according to claim 8, characterized in that: When the switching device completes the closing operation, the current-carrying contact (3) and the breaking contact (4) are both in the closed state.

10. The circuit structure according to claim 8, characterized in that: When the switching device completes the closing operation, the current-carrying contact (3) is in the closed state, and the breaking contact (4) is in the breaking state.

11. The circuit structure according to claim 10, characterized in that: The breaking moving contact part (41) comprises a contact support (411) rotating around a rotating shaft A, the contact support (411) is connected with the second connecting rod (82) of the breaking contact linkage mechanism (8), the contact support (411) is rotationally connected with a contact piece (412) rotating around a rotating shaft B, the contact piece (412) is provided with a breaking moving contact point (413) for contact matching with the breaking static contact (42), the contact piece (412) and the contact support (411) are provided with an elastic reset member for elastically abutting the breaking moving contact point (413) and the breaking static contact (42), and the contact piece (412) is provided with an abutting part (414) on a part between the rotating shaft B and the breaking moving contact point (413), and a limiting part (43) is fixedly arranged in the installation space of the breaking contact (4), when the abutting part (414) and the limiting part (43) abut together, the abutting part (414) forms a lever fulcrum structure of the contact piece (412), so that when the contact support (411) continues to act under the control of the breaking contact linkage mechanism (8), one end of the contact piece (412) provided with the breaking moving contact point (413) is lifted to disconnect with the breaking static contact (42); the limiting part (43) is connected to the breaking static contact (42), and at least one of the limiting part (43) and the abutting part (414) is a non-conductive structure.

12. A switchgear, characterized by: The circuit structure comprises the circuit structure according to any one of claims 1 to 9.

13. The switchgear according to claim 12, characterized in that: The switch device is a disconnector or a circuit breaker.

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