Vacuum load switch for preventing closing rebound of vacuum arc-extinguishing chamber

Abstract

The utility model relates to a vacuum load switch for preventing closing rebound of a vacuum arc-extinguishing chamber. The vacuum load switch includes: a support frame; a drive mechanism movably mounted to the support frame and movable in response to an outer partial closing or closing action; the contact knife assembly comprises a static contact knife and a movable contact knife which are fixedly installed on the supporting frame and the driving mechanism respectively, and the movable contact knife can be driven by the driving mechanism to be connected with or disconnected from the static contact knife; the transmission mechanism is movably mounted on the supporting frame and can be driven by the driving mechanism to move; the vacuum arc-extinguishing chamber is fixedly arranged on the supporting frame and is connected to the transmission mechanism, so that the transmission mechanism controls the opening and closing of the vacuum arc-extinguishing chamber; and the limiting piece is fixedly mounted on the driving mechanism and is obliquely arranged relative to the movable contact knife, so that when the driving mechanism is switched on in place, the limiting piece can abut against the transmission mechanism to prevent the transmission mechanism from moving reversely.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a vacuum load switch for preventing a vacuum interrupter from rebounding after closing. Background Art

[0002] Load switches are widely used in various power systems as core equipment of ring main units due to their high reliability and frequent operation, such as distribution stations or substations in residential areas and load centers such as industrial and mining enterprises, to interrupt load current on demand. The more common application type of load switches in the prior art is load switches using sulfur hexafluoride insulation medium, but it should be noted that sulfur hexafluoride is a greenhouse gas and will produce toxic gases under the action of electric arcs, so this will cause the defect of poor environmental protection.

[0003] In comparison, vacuum load switches that use vacuum gaps for arc extinguishing have excellent performance in terms of environmental protection. A vacuum load switch may generally include a driving mechanism that moves in response to an external opening and closing signal, a contact knife assembly that cooperates with each other to open or close the switch under the drive of the driving mechanism, and a vacuum interrupter that is also opened or closed under the drive of the driving mechanism, so that the vacuum interrupter can be quickly closed when the contact knife assembly is closed and first opened when the contact knife assembly is opened, so that the vacuum interrupter can be kept closed during the closing action and the generated arc can be extinguished during the opening action.

[0004] However, the opening and closing actions of the vacuum interrupter in the prior art are usually actions in opposite directions along the same path. Therefore, when the driving mechanism drives the vacuum interrupter to close at high speed during the closing action, the vacuum interrupter may move in the opposite direction under high-speed collision, which may cause the vacuum interrupter to move in the opposite direction to the open position and cause the risk of functional failure.

[0005] Therefore, there is a demand in the art for a vacuum load switch with better environmental performance and more reliable closing action. Utility Model Content

[0006] The utility model aims to provide a vacuum load switch for preventing the closing rebound of a vacuum interrupter, which can at least solve part of the above problems.

[0007] According to one aspect of the utility model, there is provided a vacuum load switch for preventing rebound of a vacuum arc chamber upon closing, the vacuum load switch comprising: a support frame; a drive mechanism, which is movably mounted to the support frame and can move in response to an external opening or closing action; a contact knife assembly, which comprises a stationary contact knife and a movable contact knife, which are respectively fixedly mounted to the support frame and the drive mechanism, and the movable contact knife can engage or disengage with the stationary contact knife under the drive of the drive mechanism; a transmission mechanism, which is movably mounted to the support frame and can move under the drive of the drive mechanism; a vacuum arc chamber, which is fixedly mounted to the support frame and connected to the transmission mechanism so that the opening and closing of the vacuum arc chamber can be controlled by the transmission mechanism; a limit member, which is fixedly mounted to the drive mechanism and is arranged obliquely relative to the movable contact knife, so that when the drive mechanism is closed in place, the limit member can abut against the transmission mechanism to prevent the transmission mechanism from moving in the opposite direction.

[0008] Compared with the prior art, the vacuum load switch in the utility model can synchronously control the opening and closing of the vacuum interrupter and the opening and closing of the contact blade assembly through the driving mechanism, and has a simple structure and convenient operation. In addition, the vacuum load switch can prevent the transmission mechanism from moving in the opposite direction by means of a limiter arranged on the driving mechanism after the transmission mechanism is driven by the driving mechanism to close the switch, and the limiter that also follows the driving mechanism to close the switch is connected to the transmission mechanism, thereby preventing the possible rebound failure of the vacuum interrupter.

[0009] Preferably, the transmission mechanism includes a first transmission member and a second transmission member movably mounted to the support frame and a connecting member linked to the first transmission member and the second transmission member, wherein the first transmission member is configured to engage with the drive mechanism and the second transmission member is connected to the vacuum interrupter.

[0010] Preferably, the first transmission member includes a first main body portion mounted to the support frame and a driving section and a coupling section extending from the first main body portion and angled relative to each other, the driving section being configured to be able to engage with the driving mechanism via the moving contact blade during the closing action, and the coupling section being configured to be able to abut against the limit member when the closing action is in place.

[0011] Preferably, a first limiting block is provided at an end of the engaging section away from the first main body, and a second limiting block for cooperating with the first limiting block is provided at an end of the limiting member away from the driving mechanism.

[0012] Preferably, the connecting member includes a second main body portion for connecting the first transmission member and the second transmission member, and a first stop portion and a second stop portion extending from the second main body portion and being substantially parallel to each other, the first stop portion and the second stop portion cooperate to form a groove for accommodating the end of the joining section away from the first main body portion.

[0013] Preferably, the connecting member further includes a first limiting protrusion and a second limiting protrusion respectively extending from the first stopping portion and the second stopping portion toward the slot.

[0014] Preferably, the first stop portion is provided with an arc-shaped hollow portion.

[0015] Preferably, a rolling element is provided at an end of the engagement section away from the first main body portion.

[0016] Preferably, the transmission mechanism further comprises an elastic member connected between the second transmission member and the supporting frame.

[0017] Preferably, the connecting element is configured to be elastic.

[0018] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 It is a schematic diagram of the vacuum load switch according to the utility model in the closed position;

[0021] Figure 2 It is a schematic diagram of a vacuum load switch according to the utility model in a transition position during a closing action;

[0022] Figure 3 It is a schematic diagram of the vacuum load switch according to the utility model in the open position;

[0023] Figure 4 and Figure 5 They are respectively a stereoscopic view and a front view of the limiter of the vacuum load switch according to the utility model.

[0024] Description of reference numerals:

[0025] 100-vacuum load switch; 10-support frame; 20-driving mechanism; 30-contact knife assembly; 31-static contact knife; 32-moving contact knife; 40-transmission mechanism; 41-first transmission member; 411-first main body; 412-driving section; 413-joining section; 413a-rolling member; 414-first limiting block; 42-second transmission member; 43-connecting member; 431-second main body; 432-first stopper; 432a-first limiting protrusion; 432b-hollow part; 433-second stopper; 433a-second limiting protrusion; 44-elastic member; 50-vacuum arc extinguishing chamber; 60-limiting member; 61-second limiting block; 62-third main body; 63-limiting member. DETAILED DESCRIPTION

[0026] Now, with reference to the accompanying drawings, a schematic scheme of the vacuum load switch disclosed by the utility model is described in detail. Although the accompanying drawings are provided to present some embodiments of the utility model, the accompanying drawings do not have to be drawn according to the size of the specific implementation scheme, and certain features can be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0027] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0028] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0029] The terms "joining", "connection" and the like as used in the present invention include both that two components are indirectly connected together by means of an intermediate layer (such as adhesive, welding agent, etc.) or an intermediate piece (such as a connector, transition piece, etc.), and that two components are directly connected together without the aid of any intermediate layer (such as adhesive, welding agent, etc.) or intermediate piece (such as a connector, transition piece, etc.).

[0030] Figures 1 to 5The vacuum load switch 100 of the utility model is shown by way of example. The vacuum load switch 100 extinguishes the arc by opening the vacuum interrupter 50 during the opening operation, and can prevent the vacuum interrupter 50 from failing due to rebound during the closing operation. As shown in the figure, the vacuum interrupter 50 may include a support frame 10 and a drive mechanism 20 supported by the support frame 10, a contact knife assembly 30, a transmission mechanism 40, a vacuum interrupter 50 and a limiter 60. It can be understood by those skilled in the art that the conventional box body and operating spindle structures in the vacuum load switch 100 are not the focus of discussion of the utility model, and therefore are not described in detail herein. In addition. For the sake of clarity, the drawings of the utility model only show a portion of the support frame 10.

[0031] The contact blade assembly 30 may include a stationary contact blade 31 and a movable contact blade 32 respectively fixedly mounted to the support frame 10 and the drive mechanism 20, wherein the drive mechanism 20 may move accordingly in response to the opening action or closing action of the operating main shaft, thereby, when the drive mechanism 20 performs a closing operation, the movable contact blade 32 can be controlled to engage with the stationary contact blade 31, and when the opening operation is performed, the movable contact blade 32 can be controlled to disengage from the stationary contact blade 31.

[0032] Correspondingly, the transmission mechanism 40 can move relative to the supporting frame 10 and its two ends are respectively connected to the moving end of the vacuum interrupter 50 and the driving mechanism 20, so that the movement of the driving mechanism 20 can be transmitted to the moving end of the vacuum interrupter 50, and then when the driving mechanism 20 performs a closing operation, the moving end of the vacuum interrupter 50 can be controlled to engage with the static end of the vacuum interrupter 50, and when the opening operation is performed, the moving end of the vacuum interrupter 50 can be controlled to disengage from the static end.

[0033] Among them, the limit member 60 can be fixedly installed to the driving mechanism 20 and arranged at an angle relative to the moving contact knife 32, especially arranged on the moving path of the moving contact knife 32, so that when the driving mechanism 20 controls the moving contact knife 32 to engage with the static contact knife 31 and controls the vacuum arc chamber 50 to be closed via the transmission mechanism 40, the limit member 60 can abut against the transmission mechanism 40, so that when the driving mechanism 20 controls the vacuum arc chamber 50 to be closed in place via the transmission mechanism 40, the limit member 60 can prevent the vacuum arc chamber 50 from unexpectedly rebounding after closing by preventing the transmission mechanism 40 from moving in the opposite direction, thereby improving the reliability of the vacuum load switch 100 in the utility model.

[0034] like Figures 1 to 3 As shown, the transmission mechanism 40 may include a first transmission member 41, a second transmission member 42, a connecting member 43 and an elastic member 44 that cooperate together to form a four-bar linkage mechanism.

[0035] Among them, the first transmission member 41 may include a first main body portion 411 pivotally connected to the support frame 10, and a driving section 412 and a coupling section 413 extending from the first main body portion 411 and angled relative to each other, the first main body portion 411 is pivotally connected to the support frame 10, the driving section 412 is used to engage with the moving contact blade 32 and then engage with the driving mechanism 20 during the closing action, and the coupling section 413 can be used to abut against the limit member 60 when the closing action is in place.

[0036] The connecting member 43 may include a second main body portion 431, a first stop portion 432, and a second stop portion 433. The second main body portion 431 may be substantially configured in a straight plate shape, and the first end and the second end opposite to each other may be pivotally connected to the junction of the first main body portion 411 and the joint section 413 and the first end of the second transmission member 42, respectively. The second end of the second transmission member 42, which is substantially opposite to the first end, may be pivotally connected to the support frame 10, and the substantially middle portion of the second transmission member 42 may be connected to the support frame 10 via, for example, a removably connected elastic member 44, and the portion of the second transmission member 42 between the second end and the connection point between the second end and the elastic member 44 may be used to connect to the moving end of the vacuum interrupter 50.

[0037] Thus, the first transmission member 41 , the second transmission member 42 and the connecting member 43 are pivotally connected in sequence, so that the movement of the driving mechanism 20 can be transmitted to the moving end of the vacuum interrupter 50 .

[0038] Alternatively, if Figures 1 to 3 As shown, the first stop portion 432 and the second stop portion 433 of the connecting member 43 can extend from the second main body portion 431 of the connecting member 43 and extend substantially parallel to each other. For example, the first stop portion 432 and the second stop portion 433 can have a curvature that conforms to the moving path of the end of the coupling section 413 away from the first main body portion 411, so that the first stop portion 432 and the second stop portion 433 can cooperate to form a groove for accommodating the end of the coupling section 413 away from the first main body portion 411.

[0039] Alternatively, if Figures 1 to 3 As shown, the end of the engagement section 413 away from the first main body 411 may be provided with a rolling element 413a to reduce the friction when it moves in the slot of the second stopper 433. The end of the engagement section 413 may also be provided with a first stopper 414 that radially extends beyond the rolling element 413a. Figure 4 To Figure 5As shown, the limit member 60 may include a third main body portion 62 for connecting to the driving mechanism 20 and a limit portion 63 obliquely extending from the third main body portion 62, and the end of the limit portion 63 may be provided with a second limit block 61 for cooperating with the first limit block 414, so as to prevent the first limit block 414 from moving in the reverse direction by being snap-connected to the first limit block 414 when the switch is closed in place, thereby preventing the transmission mechanism 40 and the vacuum arc chamber 50 from moving in the reverse direction.

[0040] Alternatively, if Figures 1 to 3 As shown, a hollow portion 432b and a first limiting protrusion 432a are formed on the first stopper 432. The hollow portion 432b is formed as a substantially waist-shaped hole, and its contour may also be substantially consistent with the curvature of the slot on the first stopper 432, and the edge surrounding the hollow portion 432b has substantially the same curvature as the waist-shaped hole. The first limiting protrusion 432a protrudes radially toward the slot at a substantially middle position of the hollow portion 432b, especially at a substantially middle position of the edge thereof. In addition, the second stopper 433 may be provided with a second limiting protrusion 433a on a side thereof facing the slot, substantially opposite to the first limiting protrusion 432a.

[0041] Optionally, the connecting member 43 may be further configured to be elastic, for example, made of nylon material, so that it can undergo adaptive deformation when engaging with the first transmission member 41 during the closing operation, especially the first stop portion 432 and the second stop portion 433 can undergo local adaptive deformation, thereby avoiding reducing the speed of the driving mechanism 20 during the closing operation due to excessive resistance.

[0042] Therefore, for Figure 3 The vacuum load switch 100 shown in the open position has the movable contact blade 32 disengaged from the stationary contact blade 31. When receiving an external closing signal, the drive mechanism 20, together with the movable contact blade 32 and the limiter 60, rotates in a clockwise direction as shown in the figure until the movable contact blade 32 engages with the drive section 412 of the first transmission member 41. After the movable contact blade 32 drives the first transmission member 41 to rotate counterclockwise by a certain angle through the drive section 412, the rolling element 413a on the engagement section 413 moves out of the slot of the connecting member 43 and the movable contact blade 32 begins to disengage from the drive section 412, as shown in FIG. Figure 2 The first transmission member 41 then drives the connecting member 43 to rotate the second connecting member 43 in the counterclockwise direction until the second transmission member 42 overcomes the force of the elastic member 44 to close the vacuum interrupter 50. Figure 1 As shown, when the switch is closed, the second limit block 61 of the limit member 60 moves to the counterclockwise side of the first limit block 414 to prevent the first limit block 414 from rotating in the opposite direction, ie, rotating clockwise, under a high-speed collision.

[0043] When it is necessary to switch the vacuum load switch 100 from Figure 1The closed position shown moves to Figure 3 When the switch is in the open position shown in the figure, the driving mechanism 20, together with the movable contact blade 32 and the stopper 60, rotates in the counterclockwise direction as shown in the figure, and the stopper 60 is disengaged from the engagement section 413. After the driving mechanism 20 rotates a certain angle, the movable contact blade 32 engages with the rolling element 413a on the engagement section 413 and drives the first transmission member 41 to rotate clockwise, and the movable contact blade 32 then disengages from the rolling element 413a and causes the rolling element 413a to fall into the slot of the connecting member 43. The first transmission member 41 then drives the second transmission member 42 to rotate clockwise via the connecting member 43 to open the vacuum interrupter 50, and the elastic member 44 releases energy until it moves to Figure 3 The open position is shown. Figure 3 In the open position shown, the rolling element 413a of the engagement section 413 is located in the slot of the connecting member 43 and inside the first limiting protrusion 432a and the second limiting protrusion 433a, thereby preventing the first transmission member 41 from possible reverse movement after the open position is in place.

[0044] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A vacuum load switch (100) for preventing a vacuum interrupter (50) from rebounding upon closing, characterized in that: The vacuum load switch (100) comprises: Support frame (10); a drive mechanism (20) movably mounted to the support frame (10) and capable of moving in response to an external opening or closing action; A contact knife assembly (30), comprising a stationary contact knife (31) and a movable contact knife (32) respectively fixedly mounted to the support frame (10) and the drive mechanism (20), wherein the movable contact knife (32) can be engaged with or disengaged from the stationary contact knife (31) under the drive of the drive mechanism (20); a transmission mechanism (40) which is movably mounted to the support frame (10) and is capable of moving under the drive of the drive mechanism (20); A vacuum interrupter (50) fixedly mounted to the support frame (10) and connected to the transmission mechanism (40) so that the opening and closing of the vacuum interrupter (50) are controlled by the transmission mechanism (40); A limit member (60) is fixedly mounted to the drive mechanism (20) and arranged obliquely relative to the movable contact blade (32), so that when the drive mechanism (20) is closed in place, the limit member (60) can abut against the transmission mechanism (40) to prevent the transmission mechanism (40) from moving in the opposite direction.

2. The vacuum load switch (100) for preventing the closing rebound of the vacuum interrupter (50) according to claim 1 is characterized in that: The transmission mechanism (40) comprises a first transmission member (41) and a second transmission member (42) movably mounted to the support frame (10), and a connecting member (43) linked to the first transmission member (41) and the second transmission member (42), wherein the first transmission member (41) is configured to be engageable with the drive mechanism (20) and the second transmission member (42) is connected to the vacuum interrupter (50).

3. The vacuum load switch (100) for preventing the vacuum interrupter (50) from rebounding upon closing according to claim 2, characterized in that: The first transmission member (41) comprises a first main body portion (411) mounted to the support frame (10), and a driving section (412) and a coupling section (413) extending from the first main body portion (411) and being angled relative to each other, wherein the driving section (412) is configured to be able to be coupled to the driving mechanism (20) via the movable contact blade (32) during a closing action, and the coupling section (413) is configured to be able to abut against the limit member (60) when the closing action is in place.

4. The vacuum load switch (100) for preventing the closing rebound of the vacuum interrupter (50) according to claim 3 is characterized in that: A first limiting block (414) is provided at the end of the joint section (413) away from the first main body (411), and a second limiting block (61) for cooperating with the first limiting block (414) is provided at the end of the limiting member (60) away from the driving mechanism (20).

5. The vacuum load switch (100) for preventing the vacuum interrupter (50) from rebounding upon closing according to claim 3, characterized in that: The connecting member (43) includes a second main body portion (431) for connecting the first transmission member (41) and the second transmission member (42), and a first stop portion (432) and a second stop portion (433) extending from the second main body portion (431) and being substantially parallel to each other, wherein the first stop portion (432) and the second stop portion (433) cooperate to form a groove for accommodating the end of the coupling section (413) away from the first main body portion (411).

6. The vacuum load switch (100) for preventing the closing rebound of the vacuum interrupter (50) according to claim 5 is characterized in that: The connecting member (43) further comprises a first limiting protrusion (432a) and a second limiting protrusion (433a) respectively extending from the first stopping portion (432) and the second stopping portion (433) towards the slot.

7. The vacuum load switch (100) for preventing the closing rebound of the vacuum interrupter (50) according to claim 5 is characterized in that: The first stopper (432) is provided with a hollow portion (432b) configured in an arc shape.

8. The vacuum load switch (100) for preventing the closing rebound of the vacuum interrupter (50) according to claim 5 is characterized in that: A rolling element (413a) is provided at the end of the joint section (413) away from the first main body (411).

9. The vacuum load switch (100) for preventing the closing rebound of the vacuum interrupter (50) according to claim 2 is characterized in that: The transmission mechanism (40) further comprises an elastic member (44) connected between the second transmission member (42) and the support frame (10).

10. The vacuum load switch (100) for preventing the vacuum interrupter (50) from rebounding upon closing according to claim 5, characterized in that: The connecting piece (43) is configured to have elasticity.

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