Switch unit and isolating switch

Abstract

The utility model discloses a switch unit and an isolating switch, and relates to the technical field of electric appliance switches. The switch unit comprises a moving contact mechanism and a static contact mechanism, the moving contact mechanism comprises a contact support and a plurality of moving contacts which are coaxially arranged on the contact support at intervals, and the static contact mechanism comprises a static contact assembly and an integrated static contact which are arranged on the two opposite sides of the contact support respectively. The static contact assembly comprises a plurality of static contacts which are arranged in parallel at intervals along the rotating shaft direction of the moving contact, the plurality of static contacts are all provided with first contact parts, the integrated static contact is provided with a plurality of second contact parts in parallel at intervals, the plurality of second contact parts are connected in series, and the contact support drives the moving contact to rotate. And two opposite ends of the moving contact are respectively contacted with or separated from the first contact part and the second contact part. The switch unit and the isolating switch can improve the direct current voltage during working of the switch unit and the isolating switch.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical switches, in particular to a switch unit and an isolating switch. Background Art

[0002] Isolating switches play two roles in power systems: one is control, that is, according to the needs of power system operation, a part of the power equipment or lines are put into or out of operation; the other is protection, that is, when a power equipment or line fails, the faulty part is quickly cut off from the power system to ensure the normal operation of the fault-free part of the power system.

[0003] The original low-voltage electrical appliances refer to electrical equipment that works at alternating current (AC) voltage below 1200V and direct current (DC) voltage below 1500V. According to the latest low-voltage electrical appliance industry standard development plan, low-voltage electrical appliances will be developed to below AC2000V and DC3000V. Currently, the isolating switch products on the market can only reach single-pole DC750V and two-pole DC1500V, which can no longer meet customers' demand for isolating switch products. Utility Model Content

[0004] The utility model aims to provide a switch unit and an isolating switch, which can improve the DC voltage during operation.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In the first aspect of the embodiment of the utility model, a switch unit is provided, comprising a moving contact mechanism and a stationary contact mechanism, wherein the moving contact mechanism comprises a contact support and a plurality of moving contacts coaxially and spaced apart on the contact support, wherein the stationary contact mechanism comprises a stationary contact assembly and an integrated stationary contact respectively arranged on opposite sides of the contact support, wherein the stationary contact assembly comprises a plurality of stationary contacts arranged in parallel and spaced apart along the rotating axis direction of the moving contact, wherein a first contact portion is arranged on each of the plurality of stationary contacts, and a plurality of second contact portions are arranged in parallel and spaced apart on the integrated stationary contact, wherein the plurality of second contact portions are connected in series, wherein the contact support drives the moving contact to rotate, and the opposite ends of the moving contact are in contact with or separated from the first contact portion and the second contact portion respectively. The switch unit can increase the DC voltage when it is working.

[0007] Optionally, the moving contact includes two moving contact busbars stacked and spaced apart along the rotation axis direction of the moving contact, and the moving contact rotates so that the first contact portion is clamped between one end of the two moving contact busbars and the second contact portion is clamped between the other ends of the two moving contact busbars.

[0008] Optionally, the contact support includes a plurality of sub-supports which are stacked and fixedly connected, the moving contact is fixedly arranged on the sub-supports, and the plurality of moving contacts correspond one-to-one to the plurality of sub-supports.

[0009] Optionally, an arc extinguishing mechanism is further included, wherein the arc extinguishing mechanism is arranged outside the rotation path of the moving contact, and the arc extinguishing mechanism is used to extinguish the arc generated between the moving contact mechanism and the static contact mechanism.

[0010] Optionally, the arc extinguishing mechanism includes an arc extinguishing chamber and a permanent magnet fixedly disposed in the arc extinguishing chamber, and the permanent magnet is used to generate a magnetic field to guide and stretch the arc generated between the moving contact mechanism and the static contact mechanism.

[0011] Optionally, the arc extinguishing chamber includes two sub-shells that are interlocked, and an arc-striking plate is provided on one side of the two sub-shells facing the contact bracket. The wall surface of the sub-shells cooperates with the plate surface of the arc-striking plate to form a rotating channel for the moving contact to pass through, and multiple protrusions are provided on the two arc-striking plates.

[0012] Optionally, heat dissipation holes are provided on a side of the sub-shell and the arc-starting plate away from the rotating channel.

[0013] Optionally, there are multiple arc extinguishing mechanisms, and the multiple arc extinguishing mechanisms located on the same side of the contact bracket are stacked and spaced apart along the rotation axis direction of the moving contact, the multiple arc extinguishing mechanisms located on one side of the contact bracket correspond one-to-one to the multiple first contact portions, and the multiple arc extinguishing mechanisms located on the other side of the contact bracket correspond one-to-one to the multiple second contact portions.

[0014] The second aspect of the embodiment of the utility model provides an isolating switch, comprising a handle, an operating mechanism and the above-mentioned switch unit, wherein the handle is drivingly connected to the moving contact of the switch unit through the operating mechanism, and the handle is used to drive the operating mechanism to rotate to drive the moving contact of the switch unit to rotate. The switch unit can increase the DC voltage when it is working.

[0015] Optionally, the number of the switch units includes multiple, and the multiple switch units are distributed on the same side or different sides of the operating mechanism.

[0016] Optionally, the number of the switch units includes at least one, the isolating switch also includes at least one common switch unit, the common switch unit has at least one common static contact for external wiring, and at least one of the switch units and at least one of the common switch units are distributed on the same side and / or different sides of the operating mechanism.

[0017] The beneficial effects of the embodiments of the utility model include:

[0018] The switch unit includes a moving contact mechanism and a stationary contact mechanism, the moving contact mechanism includes a contact support and a plurality of moving contacts coaxially and spaced on the contact support, the stationary contact mechanism includes a stationary contact assembly and an integrated stationary contact respectively arranged on opposite sides of the contact support, the stationary contact assembly includes a plurality of stationary contacts arranged in parallel and spaced along the rotating axis direction of the moving contact, a first contact portion is arranged on each of the plurality of stationary contacts, a plurality of second contact portions are arranged in parallel and spaced on the integrated stationary contact, the plurality of second contact portions are connected in series, the contact support drives the moving contact to rotate, and the opposite ends of the moving contact are respectively in contact with or separated from the first contact portion and the second contact portion. Since the plurality of second contact portions of the integrated stationary contact are connected in series, the breaking voltage capacity of the switch unit can be improved. In addition, from the appearance of the switch unit, the moving contact mechanism and the stationary contact mechanism are both accommodated in the unit housing of the switch unit, so that the effect of a single pole in appearance but a multi-pole series connection in essence can be achieved, thereby improving the integrity and consistency of the appearance of the switch unit, and avoiding a significant increase in the volume of the switch unit, which is helpful to achieve the miniaturization of the isolating switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a switch unit provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of an integrated static contact provided in an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of a contact support provided in an embodiment of the utility model;

[0023] Figure 4 One of the structural schematic diagrams of the arc extinguishing mechanism provided in the embodiment of the utility model;

[0024] Figure 5 The second structural schematic diagram of the arc extinguishing mechanism provided in the embodiment of the utility model;

[0025] Figure 6 It is a structural schematic diagram of an isolating switch in the prior art;

[0026] Figure 7It is a structural schematic diagram of another isolating switch in the prior art;

[0027] Figure 8 A schematic diagram of the structure of the isolating switch provided in the first embodiment of the utility model;

[0028] Fig. 9 A schematic diagram of the structure of an isolating switch provided in the second embodiment of the utility model;

[0029] Fig.10 A schematic diagram of the structure of an isolating switch provided in the third embodiment of the utility model;

[0030] Fig.11 This is a schematic structural diagram of an isolating switch provided in the fourth embodiment of the utility model.

[0031] Icons: 100- switch unit; 10- moving contact mechanism; 11- contact bracket; 111- sub- bracket; 112- connecting piece; 12- moving contact; 121- moving contact busbar; 20- stationary contact mechanism; 21- stationary contact assembly; 211- stationary contact; 2111- first contact portion; 22- integrated stationary contact; 221- second contact portion; 222- connecting section; 30- arc extinguishing mechanism; 31- arc extinguishing chamber; 311- sub-housing; 312- arc striking plate; 3121- protrusion; 313- heat dissipation hole; 32- permanent magnet; 200- isolating switch; 210- ordinary switch unit. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] As is known to all, voltage division can be achieved by series connection. If the contact arc extinguishing system of the common switch unit 210 in the prior art is connected in series, a higher voltage division effect can be obtained, so that the switch electrical appliance obtains a higher breaking voltage capability. For example, for the same contact arc extinguishing system, assuming that two common switch units 210 can break a voltage of 1500V after being connected in series, then three common switch units 210 can break a voltage of 2000V after being connected in series, and four common switch units 210 can break a voltage of 2500V or 3000V after being connected in series.

[0039] However, the series connection in the prior art is carried out in series through at least one common static contact for external wiring of the common switch unit 210 in the external connection line row, resulting in a large volume of the switch electrical appliance after the series connection, and poor appearance integrity and consistency. In order to solve the above problems, the embodiment of the present application provides a switch unit 100, which improves the structure of the contact arc extinguishing mechanism of the common switch unit 210 in the prior art, not only can the segmented voltage capacity of the switch unit 100 be improved, but also the integrity and consistency of the appearance of the switch unit 100 can be improved, and a significant increase in the volume of the switch unit 100 can be avoided, which helps to achieve the miniaturization of the isolating switch 200.

[0040] Please refer to Figures 1 to 5 The switch unit 100 includes a moving contact mechanism 10 and a stationary contact mechanism 20. The moving contact mechanism 10 includes a contact support 11 and a plurality of moving contacts 12 coaxially and spaced apart on the contact support 11. The stationary contact mechanism 20 includes a stationary contact assembly 21 and an integrated stationary contact 22 respectively disposed on opposite sides of the contact support 11. The stationary contact assembly 21 includes a plurality of stationary contacts 211 disposed in parallel and spaced apart along the rotation axis direction of the moving contact 12. A first contact portion 2111 is disposed on each of the plurality of stationary contacts 211. A plurality of second contact portions 221 are disposed in parallel and spaced apart on the integrated stationary contact 22. The plurality of second contact portions 221 are connected in series. The contact support 11 drives the moving contact 12 to rotate. The opposite ends of the moving contact 12 are in contact with or separated from the first contact portion 2111 and the second contact portion 221 respectively. The switch unit 100 can increase the DC voltage when it is working. For ease of understanding, the drawings illustrate two moving contacts 12 and two stationary contacts 211 . It should be clear that the numbers in the drawings do not serve as a limitation.

[0041] It should be noted that if Figure 1 As shown, the switch unit 100 includes a moving contact mechanism 10 and a stationary contact mechanism 20. When the moving contact mechanism 10 is driven to rotate toward a side close to the stationary contact mechanism 20, the moving contact mechanism 10 can be brought into contact with the stationary contact mechanism 20, thereby placing the switch unit 100 in a closed state; when the moving contact mechanism 10 is driven to rotate toward a side away from the stationary contact mechanism 20, the moving contact mechanism 10 can be separated from the stationary contact mechanism 20, thereby placing the switch unit 100 in an open state, thereby enabling the switch unit 100 to control the on / off of the circuit to which it is connected.

[0042] Specifically, Figure 1As shown, the moving contact mechanism 10 includes a contact support 11 and a plurality of moving contacts 12 fixedly arranged on the contact support 11. The plurality of moving contacts 12 are coaxial and spaced apart. Thus, the contact support 11 can be driven to drive the plurality of moving contacts 12 to rotate synchronously, so that the switch unit 100 can be closed or opened. Please continue to refer to Figure 1 Corresponding to the moving contact mechanism 10, the stationary contact mechanism 20 includes a stationary contact assembly 21 and an integrated stationary contact 22. The stationary contact assembly 21 and the integrated stationary contact 22 are both arranged in a plane perpendicular to the rotation axis direction of the moving contact 12, and the stationary contact assembly 21 and the integrated stationary contact 22 are respectively arranged on opposite sides of the contact bracket 11.

[0043] Among them, Figure 1 As shown, the static contact assembly 21 includes a plurality of static contacts 211, which are arranged parallel and spaced along the rotation axis direction of the moving contact 12, and each of the plurality of static contacts 211 is provided with a first contact portion 2111, which extends toward a side close to the contact bracket 11. Figure 2 A plurality of second contact portions 221 are arranged in parallel and at intervals on the integrated static contact 22 . The plurality of second contact portions 221 are connected in series, and the plurality of second contact portions 221 all extend toward a side close to the contact support 11 .

[0044] When the contact bracket 11 drives the moving contact 12 to rotate, one end of the moving contact 12 moves toward or away from the static contact assembly 21, so that one end of the moving contact 12 contacts with or separates from the first contact portion 2111. At the same time, the other end of the moving contact 12 moves toward or away from the integrated static contact 22, so that the other end of the moving contact 12 contacts with or separates from the second contact portion 221.

[0045] Since the multiple second contact portions 221 of the integrated static contact 22 are connected in series, the breaking voltage capacity of the switch unit 100 can be improved. In addition, from the appearance of the switch unit 100, the moving contact mechanism 10 and the static contact mechanism 20 are both accommodated in the unit housing of the switch unit 100, so it can achieve the effect of a single pole in appearance but multiple poles in series in essence, thereby improving the integrity and consistency of the appearance of the switch unit 100, and avoiding a significant increase in the volume of the switch unit 100, which helps to achieve the miniaturization of the isolating switch 200.

[0046] It should also be noted that if Figure 2As shown, for example, in this embodiment, the number of the second contact portions 221 includes two, and the series connection of the two second contact portions 221 can be realized by the connecting section 222 located between the two second contact portions 221, so that the series connection of the two second contact portions 221 is hidden inside the connecting section 222 and cannot be seen from the appearance of the integrated static contact 22. Of course, in other embodiments, when the number of the second contact portions 221 includes three or more, the series connection can also be realized by the connecting section 222 located between the plurality of second contact portions 221, so that the series connection of the plurality of second contact portions 221 is hidden inside the connecting section 222 and cannot be seen from the appearance of the integrated static contact 22.

[0047] like Figure 1 As shown, in this embodiment, the moving contact 12 includes two moving contact bus bars 121 stacked and spaced apart along the rotation axis direction of the moving contact 12. The moving contact 12 rotates so that the first contact portion 2111 is clamped between one end of the two moving contact bus bars 121 and the second contact portion 221 is clamped between the other ends of the two moving contact bus bars 121.

[0048] It should be noted that when the contact bracket 11 drives the moving contact 12 to rotate, one end of the moving contact busbar 121 moves toward the direction close to the static contact assembly 21, so that the first contact portion 2111 is clamped between one end of the two moving contact busbars 121. At the same time, the other end of the moving contact busbar 121 moves toward the direction close to the integrated static contact 22, so that the second contact portion 221 is clamped between the other ends of the two moving contact busbars 121, thereby enabling the switch unit 100 to be closed.

[0049] like Figure 1 and Figure 3 As shown, in this embodiment, the contact support 11 includes a plurality of sub-supports 111 which are stacked and fixedly connected, the moving contact 12 is fixedly arranged on the sub-support 111 , and the plurality of moving contacts 12 correspond to the plurality of sub-supports 111 one by one.

[0050] It should be noted that if Figure 3 As shown, the contact support 11 includes a plurality of sub-supports 111, and the plurality of sub-supports 111 are stacked along the rotation axis direction of the moving contact 12, and the plurality of sub-supports 111 are fixedly connected to each other to improve the integrity of the contact support 11, which is beneficial to the synchronization of the movement of the moving contact 12. For example, in this embodiment, the plurality of sub-supports 111 are fixedly connected by the connecting member 112. Of course, in other embodiments, the end faces of the plurality of sub-supports 111 close to each other can also be directly fixedly connected, for example, the plurality of sub-supports 111 are welded and fixed, or the plurality of sub-supports 111 are integrally formed.

[0051] like Figure 1As shown, in this embodiment, the switch unit 100 also includes an arc extinguishing mechanism 30, which is arranged on the outside of the rotation path of the moving contact 12. The arc extinguishing mechanism 30 is used to extinguish the arc generated between the moving contact mechanism 10 and the static contact mechanism 20 to improve the safety performance of the switch unit 100.

[0052] Specifically, Figure 1 , Figure 4 and Figure 5 As shown, in this embodiment, the arc extinguishing mechanism 30 includes an arc extinguishing chamber 31 and a permanent magnet 32 ​​fixedly disposed in the arc extinguishing chamber 31 , and the permanent magnet 32 ​​is used to generate a magnetic field to guide the arc generated between the moving contact mechanism 10 and the static contact mechanism 20 .

[0053] It should be noted that the arc extinguishing mechanism 30 is arranged outside the rotation path of the moving contact 12, and the arc extinguishing mechanism 30 includes an arc extinguishing chamber 31 and a permanent magnet 32 ​​fixedly arranged in the arc extinguishing chamber 31, so that the magnetic field generated by the permanent magnet 32 ​​corresponds to the area where the arc is generated between the moving contact mechanism 10 and the static contact mechanism 20, so that the magnetic field generated by the permanent magnet 32 ​​can guide the stretched arc to extinguish it. Among them, the arc extinguishing chamber 31 can be made of insulating material to avoid the arc extinguishing chamber 31 affecting the magnetic field generated by the permanent magnet 32.

[0054] like Figure 1 , Figure 4 and Figure 5 As shown, in this embodiment, the arc extinguishing chamber 31 includes two sub-shells 311 that are interlocked, and an arc-striking plate 312 is provided on the side of the two sub-shells 311 facing the contact bracket 11. The wall surface of the sub-shell 311 cooperates with the plate surface of the arc-striking plate 312 to form a rotating channel for the moving contact 12 to pass through, and a plurality of protrusions 3121 are provided on the two arc-striking plates 312.

[0055] It should be noted that the arc extinguishing chamber 31 includes two mutually buckled sub-shells 311, so that the two sub-shells 311 are buckled to form a receiving cavity for placing the permanent magnet 32. According to the left-hand rule, the magnetic force generated by the permanent magnet 32 ​​will be directed toward the two sides of the arc extinguishing chamber 31. In order to improve the arc extinguishing effect, the two sub-shells 311 are both provided with arc-starting plates 312 on one side facing the contact bracket 11. Both arc-starting plates 312 are provided with a plurality of protrusions 3121, and the arc is further guided by the protrusions 3121, thereby further lengthening the arc ( Figure 4 The thick black line in FIG. 3 is the arc path when the arc passes through the protrusion 3121).

[0056] like Figure 1 , Figure 4 and Figure 5As shown, in this embodiment, heat dissipation holes 313 are provided on the side of the sub-shell 311 and the arc-starting plate 312 away from the rotating channel to dissipate the heat generated by the permanent magnet 32 ​​during operation, thereby preventing the permanent magnet 32 ​​from demagnetizing after overheating.

[0057] Corresponding to the moving contact mechanism 10 and the stationary contact mechanism 20, as shown in FIG. Figure 1 As shown, in the present embodiment, there are multiple arc extinguishing mechanisms 30, and the multiple arc extinguishing mechanisms 30 located on the same side of the contact bracket 11 are stacked and spaced apart along the rotation axis direction of the moving contact 12, the multiple arc extinguishing mechanisms 30 located on one side of the contact bracket 11 correspond one-to-one to the multiple first contact portions 2111, and the multiple arc extinguishing mechanisms 30 located on the other side of the contact bracket 11 correspond one-to-one to the multiple second contact portions 221.

[0058] The embodiment of the present application further provides an isolating switch 200, comprising a handle, an operating mechanism and a switch unit 100, wherein the handle is drivingly connected to a contact support 11 of the switch unit 100 through the operating mechanism, and the handle is used to drive the operating mechanism to rotate so as to drive the movable contact 12 of the switch unit 100 to rotate. Since the structure and beneficial effects of the switch unit 100 have been described in detail in the aforementioned embodiment, they will not be described in detail here.

[0059] Alternatively, if Fig.10 and Fig.11 As shown, the number of the switch units 100 includes a plurality, and the plurality of switch units 100 are distributed on the same side or different sides of the operating mechanism.

[0060] Alternatively, if Figure 8 and Fig. 9 As shown, the number of switch units 100 includes at least one, and the isolating switch 200 also includes at least one common switch unit 210, the common switch unit 210 has at least one common static contact for external wiring, and at least one switch unit 100 and at least one common switch unit 210 are distributed on the same side and / or different sides of the operating mechanism.

[0061] According to the above description of the number and position of the switch unit 100, as shown in FIG. Figures 8 to 11 As shown, when the switch unit 100 is used in the isolating switch 200, a variety of combinations can be formed, and some combinations are listed below for explanation. In actual application, those skilled in the art can directly select any combination, and can also make reasonable selections and designs according to actual conditions. The above combinations are only used for illustrative purposes and do not serve as a limitation.

[0062] Assuming that the common switch unit 210 in the prior art can break a voltage of 1000V, the switch unit 100 provided in the present application can break a voltage of 2000V due to the effect of internal series connection.

[0063] like Figure 6 As shown, in the combination provided by the prior art, the 2-pole isolating switch uses two left and right common switch units 210, which can reach a voltage of 2000V.

[0064] like Figure 7 As shown, in the combination provided by the prior art, the 2-pole isolating switch uses two common switch units 210, which can reach a voltage of 2000V.

[0065] like Figure 8 As shown, in the combination provided in the first embodiment, the 2-pole isolating switch 200 uses a switch unit 100 and a common switch unit 210, and can reach a voltage of 3000V.

[0066] like Fig. 9 As shown, in the combination provided in the second embodiment, the 2-pole isolating switch 200 uses one switch unit 100 and one common switch unit 210, and can reach a voltage of 3000V.

[0067] like Fig.10 As shown, in the combination provided by the third embodiment, the 2-pole isolating switch 200 uses two left and right switch units 100, and can reach a voltage of 4000V.

[0068] like Fig.11 As shown, in the combination provided by the fourth embodiment, the 2-pole isolating switch 200 uses the right two switch units 100, and can reach a voltage of 4000V.

[0069] The embodiment of the present application also provides a power supply system, including a DC source, a power conversion unit and the above-mentioned isolating switch 200, wherein the isolating switch 200 is connected between the DC source and the power conversion unit, and when the DC source or the power conversion unit fails, the isolating switch 200 is operated to realize the opening of the gate, thereby ensuring the normal use of the power supply system and improving the safety performance of the power supply system. Since the structure and beneficial effects of the isolating switch 200 have been described in detail in the above-mentioned embodiment, they will not be repeated here.

[0070] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A switch unit, characterized in that: The invention comprises a moving contact mechanism (10) and a stationary contact mechanism (20), wherein the moving contact mechanism (10) comprises a contact support (11) and a plurality of moving contacts (12) coaxially and spaced apart on the contact support (11), and the stationary contact mechanism (20) comprises a stationary contact assembly (21) and an integrated stationary contact (22) respectively arranged on opposite sides of the contact support (11), and the stationary contact assembly (21) comprises a plurality of moving contacts (12) arranged in parallel and spaced apart along the rotation axis direction of the moving contact (12). A plurality of stationary contacts (211), each of the plurality of stationary contacts (211) being provided with a first contact portion (2111), a plurality of second contact portions (221) being provided on the integrated stationary contact (22) in parallel and at intervals, the plurality of second contact portions (221) being connected in series, the contact support (11) driving the moving contact (12) to rotate, and the opposite ends of the moving contact (12) being in contact with or separated from the first contact portion (2111) and the second contact portion (221), respectively.

2. The switch unit according to claim 1, characterized in that: The moving contact (12) comprises two moving contact bus bars (121) stacked and spaced apart along the rotation axis direction of the moving contact (12); the moving contact (12) rotates so that the first contact portion (2111) is clamped between one ends of the two moving contact bus bars (121), and the second contact portion (221) is clamped between the other ends of the two moving contact bus bars (121).

3. The switch unit according to claim 1, characterized in that: The contact support (11) comprises a plurality of sub-supports (111) which are stacked and fixedly connected, the moving contact (12) is fixedly arranged on the sub-support (111), and the plurality of moving contacts (12) correspond one to one to the plurality of sub-supports (111).

4. The switch unit according to claim 1, characterized in that: It also comprises an arc extinguishing mechanism (30), which is arranged outside the rotation path of the moving contact (12), and is used to extinguish the arc generated between the moving contact mechanism (10) and the stationary contact mechanism (20).

5. The switch unit according to claim 4, characterized in that: The arc extinguishing mechanism (30) comprises an arc extinguishing chamber (31) and a permanent magnet (32) fixedly arranged in the arc extinguishing chamber (31), wherein the permanent magnet (32) is used to generate a magnetic field to guide and stretch an arc generated between the moving contact mechanism (10) and the stationary contact mechanism (20).

6. The switch unit according to claim 5, characterized in that: The arc extinguishing chamber (31) comprises two sub-shells (311) that are interlocked with each other, and an arc-striking plate (312) is provided on one side of the two sub-shells (311) facing the contact bracket (11). The wall surface of the sub-shell (311) cooperates with the plate surface of the arc-striking plate (312) to form a rotating channel for the moving contact (12) to pass through, and a plurality of protrusions (3121) are provided on the two arc-striking plates (312).

7. The switch unit according to claim 6, characterized in that: Heat dissipation holes (313) are provided on the side of the sub-housing (311) and the arc-starting plate (312) away from the rotating channel.

8. The switch unit according to claim 4, characterized in that: The number of the arc extinguishing mechanisms (30) is multiple, and the multiple arc extinguishing mechanisms (30) located on the same side of the contact support (11) are stacked and spaced apart along the rotation axis direction of the moving contact (12); the multiple arc extinguishing mechanisms (30) located on one side of the contact support (11) correspond one-to-one to the multiple first contact portions (2111), and the multiple arc extinguishing mechanisms (30) located on the other side of the contact support (11) correspond one-to-one to the multiple second contact portions (221).

9. An isolating switch, characterized in that: The invention comprises a handle, an operating mechanism and a switch unit (100) as claimed in any one of claims 1 to 8, wherein the handle is drivingly connected to a contact support (11) of the switch unit (100) via the operating mechanism, and the handle is used to drive the operating mechanism to rotate so as to drive a moving contact (12) of the switch unit (100) to rotate.

10. The isolating switch according to claim 9, characterized in that: The number of the switch units (100) includes a plurality, and the plurality of switch units (100) are distributed on the same side or different sides of the operating mechanism.

11. The isolating switch according to claim 9, characterized in that: The number of the switch unit (100) includes at least one, the isolating switch (200) further includes at least one common switch unit (210), the common switch unit (210) has at least one common static contact for external wiring, and at least one switch unit (100) and at least one common switch unit (210) are distributed on the same side and / or different sides of the operating mechanism.

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