Three-position switch and gas insulation switch cabinet

Abstract

The utility model provides a three-position switch and a gas insulation switch cabinet, the three-position switch comprises a frame, a first rotating shaft and a circuit assembly corresponding to each phase, the circuit assembly comprises a first static contact, a second static contact and a knife; the three-position switch also comprises a linkage mechanism, and the linkage mechanism comprises a first connecting rod, one end of which is fixed on the first rotating shaft; one end of the second connecting rod is fixed to the second rotating shaft, and the length of the first connecting rod is different from that of the second connecting rod; the third connecting rod is connected between the first connecting rod and the second connecting rod, and the third connecting rod is hinged to the first connecting rod and the second connecting rod; the rotating angle of the second connecting rod is smaller than that of the first connecting rod. The existence of the linkage mechanism can ensure that three stations are isolated and switched on in place and grounded and switched on in place.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of switch cabinet, especially a three-position switch and gas insulated switch cabinet. BACKGROUND

[0002] Gas Insulated Switchgear (GIS) includes ring network feeder cabinet, circuit breaker cabinet and the like. Among them, the circuit breaker cabinet includes vacuum interrupter in gas tank and three-position disconnector and related operating mechanism.

[0003] The circuit breaker cabinet has developed towards miniaturization, and in order to save space, the height of the gas tank is also small. In order to adapt to this smaller gas tank, the vacuum interrupter and the disconnector inside it need to be redesigned. One way is to reasonably arrange the lower isolation three-position switch as an upper isolation three-position switch. In this way, the position of the rotating shaft of the three-position switch needs to be adjusted.

[0004] How to provide an upper isolation three-position switch becomes a problem to be solved urgently. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a three-position switch, which includes a frame, a first rotating shaft and a circuit assembly corresponding to each phase, the first rotating shaft is rotatably connected to the frame, and the operating mechanism of the three-position switch has a second rotating shaft, the circuit assembly includes:

[0006] A first stationary contact fixed to the frame;

[0007] A second stationary contact fixed to the frame;

[0008] A knife fixed to the first rotating shaft;

[0009] The second rotating shaft can drive the first rotating shaft to rotate, and the first rotating shaft can drive the knife to rotate between the first stationary contact and the second stationary contact;

[0010] The three-position switch further includes a linkage mechanism, and the linkage mechanism includes:

[0011] A first connecting rod having one end fixed to the first rotating shaft;

[0012] A second connecting rod having one end fixed to the second rotating shaft, and the first connecting rod and the second connecting rod are different in length;

[0013] A third connecting rod connected between the first connecting rod and the second connecting rod, and the third connecting rod is respectively hinged to the first connecting rod and the second connecting rod;

[0014] The angle of rotation of the second connecting rod is smaller than the angle of rotation of the first connecting rod.

[0015] In this way, due to the linkage mechanism, the position of the knife in contact with the static contact is deeper with the first rotating shaft, although a certain collision force will be generated between the knife and the static contact to rotate a little bit in the opposite direction, it can also ensure that the three-position switch is isolated and closed to the position and the grounding switch is closed to the position.

[0016] According to the three-position switch as described above, optionally, the length of the second connecting rod is different from that of the first connecting rod.

[0017] According to the three-position switch as described above, optionally, the length of the second connecting rod is greater than that of the first connecting rod; and / or the second connecting rod and the first connecting rod are at different heights. Such an implementation is relatively simple.

[0018] According to the three-position switch as described above, optionally, further comprising:

[0019] A sleeve is sleeved on the first rotating shaft and located on the side of the first connecting rod away from the static contact;

[0020] A support rod is fixed to the sleeve and the frame.

[0021] Through the fixation of the sleeve and the support rod, the first connecting rod will not become a cantilever, and the first connecting rod is relatively stable during rotation, thereby ensuring the reliability of the performance of the three-position switch.

[0022] According to the three-position switch as described above, optionally, the first rotating shaft comprises:

[0023] A shaft rod, the knife is fixed on the shaft rod;

[0024] A first connecting piece is provided through the frame and one end of the first connecting piece is fixed to the shaft rod, and the first connecting rod is fixed to the end of the first connecting piece away from the shaft rod.

[0025] Such an implementation is relatively simple.

[0026] According to the three-position switch as described above, optionally, the second connecting rod has a polygonal hole, and the second connecting rod is sleeved on the second rotating shaft through the polygonal hole. Such a design mechanism is simple and convenient to implement.

[0027] According to the three-position switch as described above, optionally, the linkage mechanism is located on the outside of the frame, the first rotating shaft and the circuit assembly are located on the inside of the frame, and the second rotating shaft is located on the outside of the frame.

[0028] Optionally, the three-position switch described above is located in the gas box of a gas-insulated switchgear.

[0029] This utility model also provides a gas-insulated switch cabinet, including a three-position switch as described in any of the preceding claims.

[0030] Optionally, according to the gas-insulated switchgear described above, the gas-insulated switchgear further includes a gas box, the three-position switch is located inside the gas box, and the operating mechanism is located outside the gas box. Attached Figure Description

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0032] Figure 1 This is a schematic diagram of the structure of the three-position switch according to the present invention.

[0033] Figure 2 This is a structural schematic diagram of the linkage mechanism according to the present invention.

[0034] The reference numerals in the attached figures are as follows:

[0035] 1-Framework

[0036] 2-First Rotational Shaft

[0037] 3-First stationary contact

[0038] 31-Prominent part

[0039] 32-Plate

[0040] 4-First Link

[0041] 5-Second Link

[0042] 51-Polygonal Hole

[0043] 6-Third Link

[0044] 7-Sleeve

[0045] 8-Support rod

[0046] 9-Snap ring Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided to further illustrate this utility model in detail. The nouns and pronouns referring to "person" in this patent application are not limited to specific genders.

[0048] This utility model provides a three-position switch, specifically an upper-isolated three-position switch. For example...Figure 1 and Figure 2 The three-position switch includes a frame 1, a first rotating shaft 2, and circuit components corresponding to each phase. The first rotating shaft 2 is rotatably connected to the frame 1. The three-position switch can be located in the gas chamber of a gas-insulated switchgear.

[0049] The circuit assembly includes a first stationary contact 3, a second stationary contact, and a blade. The first stationary contact 3 and the second stationary contact are fixed to the frame 1, and the blade is fixed to a first rotating shaft 2, which is rotatably connected to the frame 1. As an example, the first stationary contact 3 is an isolating contact; when the blade contacts the first stationary contact 3, the isolation is complete and the circuit is closed. The second stationary contact is a grounding contact; when the blade contacts the second stationary contact, the grounding is complete and the circuit is closed. When the three-position switch is in the open position, the blade does not contact either the first or second stationary contact. Specifically, in the open position, the blade extends along a first direction, which is, for example, a horizontal direction. Figure 1 As shown, the first stationary contact 3 has a protrusion 31 and a flat plate 32. The protrusion 31 is fixed on the flat plate 32. The cutter has two blades. When the cutter rotates from the open position to the isolation and closing position and is fully closed, the protrusion 31 can be inserted between the two blades. When the cutter rotates from the open position to the grounding position and is fully closed, the cutter can also be inserted between the cutter and the second stationary contact. Since the first stationary contact 3, the second stationary contact, and the cutter are all made of metal, such as copper or iron, and the opening and closing speeds are very fast, a certain collision force will be generated at the moment the cutter contacts the stationary contact, causing the cutter to rotate slightly in the opposite direction, which may result in incomplete closing. In order to ensure that the isolation and grounding closing are fully completed in all three positions, the inventors have proposed the three-position switch of this utility model.

[0050] The three-position switch also has an operating mechanism for operating the three-position switch. For example, the operating mechanism has a second rotating shaft, which can drive the first rotating shaft 2 of the three-position switch to rotate. The first rotating shaft can drive the blade to rotate between the first stationary contact 3 and the second stationary contact, so that the blade contacts the first stationary contact 3 and the second stationary contact respectively.

[0051] like Figure 1 As shown, the three-position switch also includes a linkage mechanism, which includes a first link 4, a second link 5, and a third link 6. One end of the first link 4 is fixed to the first rotating shaft 2, one end of the second link 5 is fixed to the second rotating shaft, and the third link 6 connects the first link 4 and the second link 5, and is respectively connected to the first link 4 and the second link 5.

[0052] In this configuration, the rotation angle of the second link 5 is less than that of the first link 4. For example, for every 1 degree that the second link 5 rotates, the first link 4 rotates by 1.01 degrees. This ensures that the final rotation angle of the first link 4 is greater than that of the second link 5, which in turn makes the rotation angle of the first rotating shaft 2 greater than that of the second rotating shaft. In other words, in both the direction of rotation of the blade towards the first stationary contact 3 and the direction of rotation of the blade towards the second stationary contact, the rotation angle of the first rotating shaft 2 is greater than that of the second rotating shaft.

[0053] To achieve different rotation angles between the first link 4 and the second link 5, the lengths of the first link 4 and the second link 5 can be set to be different. Specifically, the length of the second link 5 is greater than the length of the first link 4 and / or the second link 5 and the first link 4 are at different heights. Figure 1 and Figure 2 As shown, the second link 5 is positioned lower than the first link 4, and its length is greater than that of the first link 4. The second rotating shaft drives the second link 5 to rotate at a certain angle. The third link 6 rotates with the second link 5, and the first link 4 rotates with the third link 6 at an angle greater than that of the second link 5. This implementation is relatively simple.

[0054] Furthermore, since the first rotating shaft 2 and the second rotating shaft can be synchronized through a linkage mechanism, the position of the second rotating shaft does not need to be changed, and therefore the position of the operating mechanism does not need to be changed. The structural change can be made inside the air box, so the new air box can be matched for the previous operating mechanism, making it highly adaptable.

[0055] Thus, due to the existence of the linkage mechanism, the first rotating shaft 2 drives the knife to contact the stationary contact deeper. Although the knife and the stationary contact will generate a certain collision force and rotate slightly in the opposite direction, it can still ensure that the isolation closing and grounding closing of the three positions are in place.

[0056] Optionally, the three-position switch also includes a sleeve 7 ( Figure 2 (As shown by the dashed line) and support rod 8. Figure 2 As shown, the first rotating shaft 2 extends outward from the frame 1, and the sleeve 7 is fitted onto the first rotating shaft 2 and located on the side of the first connecting rod 4 away from the stationary contact; the support rod 8 is fixed to the sleeve 7 and the frame 1. Figure 2 As shown, the support rod 8 has a through hole, through which it is fitted onto the sleeve 7, thus fixing the two together. Both ends of the support rod 8 are fixed to the frame 1. The fixing of the sleeve 7 and the support rod 8 prevents the first connecting rod 4 from becoming cantilevered, ensuring its stability during rotation and guaranteeing the reliability of the three-position switch.

[0057] Optionally, the first rotating shaft 2 comprises a shaft rod and a first connecting piece.

[0058] Optionally, the second connecting rod 5 has a polygonal hole 51, and the second connecting rod 5 is sleeved on the second rotating shaft through the polygonal hole 51. Figure 2 As shown in the figure, the polygonal hole 51 can be a four-side hole, such as a square hole, a rectangular hole, or a hole with two opposite sides being curved as shown in the figure. Figure 2 The one end of the second rotating shaft can be a polygonal end head, which can be in interference fit or close fit with the polygonal hole 51, so that the rotation of the second rotating shaft can drive the rotation of the second connecting rod 5.

[0059] Optionally, the linkage mechanism is located outside the frame 1, the first rotating shaft 2 and the circuit assembly are located inside the frame 1, and the second rotating shaft is located outside the frame 1.

[0060] Optionally, the linkage mechanism further comprises a snap spring 9. The first connecting rod 4 and the third connecting rod 6 are hingedly connected through a pin (not shown in the figure), and the second connecting rod 5 and the third connecting rod 6 are also hingedly connected through a pin. The snap spring 9 is used to fix the pin to prevent the pin from falling off.

[0061] The utility model also provides a kind of gas insulated switchgear, it includes the three-position switch of any preceding. The gas insulated switchgear has a gas tank, and the three-position switch is located in gas tank, and operating mechanism is located outside gas tank.

[0062] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A three-position switch comprising a frame (1), a first rotating shaft (2) rotatably connected to the frame (1), and a circuit assembly corresponding to each phase, the operating mechanism of the three-position switch having a second rotating shaft, the circuit assembly comprising: a first stationary contact (3) fixed to the frame (1); a second stationary contact fixed to the frame (1); a blade fixed to the first rotating shaft (2); the second rotating shaft capable of rotating the first rotating shaft (2), and the first rotating shaft (2) capable of rotating the blade between the first stationary contact (3) and the second stationary contact; characterized in that the three-position switch further comprises a linkage mechanism, the linkage mechanism comprising: a first connecting rod (4) having one end fixed to the first rotating shaft (2); a second connecting rod (5) having one end fixed to the second rotating shaft, the first connecting rod (4) and the second connecting rod (5) having different lengths; a third connecting rod (6) connected between the first connecting rod (4) and the second connecting rod (5), and the third connecting rod (6) being hingedly connected to the first connecting rod (4) and the second connecting rod (5) respectively; the second connecting rod (5) having a smaller rotation angle than the first connecting rod (4). The second connecting rod (5) has a different length than the first connecting rod (4). The second connecting rod (5) has a length greater than the first connecting rod (4). The second connecting rod (5) is at a different height than the first connecting rod (4). Further comprising: a sleeve (7) sleeved on the first rotating shaft (2) and located on the side of the first connecting rod (4) away from the stationary contacts; a support rod (8) fixed to the sleeve (7) and the frame (1). The first rotating shaft (2) comprises: a shaft rod, the blade being fixed to the shaft rod; a first connecting piece penetrating the frame (1) and having one end fixed to the shaft rod, the first connecting rod (4) being fixed to the end of the first connecting piece away from the shaft rod. The second connecting rod (5) has a polygonal hole, and the second connecting rod (5) is sleeved on the second rotating shaft through the polygonal hole. The linkage mechanism is located outside the frame (1), the first rotating shaft (2) and the circuit assembly are located inside the frame (1), and the second rotating shaft is located outside the frame (1). The three-position switch is located in a gas tank of a gas insulated switchgear. The three-position switch according to any one of claims 1-8.

2. The three-position switch of claim 1, wherein, The gas insulated switchgear further comprises a gas tank, and the three-position switch is located in the gas tank, and the operating mechanism is located outside the gas tank.

3. The three position switch of claim 1, wherein, ​ ​ 4. The three position switch of claim 1, wherein, ​ ​ ​ 5. The three position switch of claim 1, wherein, ​ ​ ​ 6. The three position switch of claim 1, wherein, ​ 7. The three position switch of claim 1, wherein, ​ 8. The three-position switch according to any one of claims 1-7, characterized in that, ​ 9. Gas-insulated switchgear, characterized in that ​ 10. The gas insulated switchgear of claim 9, characterized in that, ​

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