Isolation grounding switch

Abstract

The utility model provides an isolation grounding switch, comprising a main shaft which is rotatably installed on a switch body and is used for driving a disconnecting link to be switched off or switched on, a positioning cam which is in linkage rotation with the main shaft is fixed on the main shaft, and a positioning groove is arranged on the positioning cam; the operation shaft is connected with the main shaft through a connecting rod assembly, and the operation shaft is provided with a driving arm extending towards the positioning plate; the positioning plate is rotationally installed on the switch body and provided with a positioning block matched with the positioning groove and a rotating arm matched with the driving arm, the positioning plate has a locking position and an unlocking position, when the disconnecting link is located at the opening position, the positioning plate is located at the locking position, and when the disconnecting link is located at the unlocking position, the positioning plate is located at the unlocking position; the positioning block abuts against the positioning groove in a matched mode so that the main shaft and the disconnecting link can be positioned and kept at the opening position, and therefore the situation that the disconnecting link rotates due to self weight, and arcing ablation is caused is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a three-position isolating switch. Background Art

[0002] The three-position disconnector has three working positions: the closing position where the main disconnector is connected, the opening position where the main disconnector is separated, and the grounding position on the grounding side. The inventor found in actual use that when the gate is in the opening position, the knife switch will rotate a certain angle toward the closing position or the grounding position due to its own weight, thereby reducing the opening distance, which in turn causes arcing and ablation, affecting the service life of the equipment. Utility Model Content

[0003] To this end, the utility model provides an isolating grounding switch, comprising a main shaft, an operating shaft and a positioning plate, wherein the main shaft is rotatably mounted on the switch body and is used to drive the knife switch to open or close, and a positioning cam is fixed on the main shaft and rotates in conjunction with the main shaft, and a positioning groove is provided on the positioning cam; the operating shaft is connected to the main shaft through a connecting rod assembly, and the operating shaft has a driving arm extending toward the positioning plate; the positioning plate is rotatably mounted on the switch body, and has a positioning block that cooperates with the positioning groove, and a rotating arm that cooperates with the driving arm, and the positioning plate has a locking position and an unlocking position, wherein when the knife switch is in the opening position, the positioning plate is in the locking position, and the positioning block cooperates with the positioning groove to abut against each other; before the knife switch rotates toward the closing position, the rotating arm is driven by the driving arm to drive the positioning block to separate from the positioning groove, and the positioning plate switches to the unlocking position.

[0004] It also includes a torsion spring, one end of which is fixed on the switch body, and the other end of which is fixed on the positioning plate.

[0005] A pin shaft is installed at the end of the driving arm, and a roller sleeved on the pin shaft and driven by the driving arm.

[0006] The connecting rod assembly includes a first cam that rotates in conjunction with the operating shaft, a second cam that rotates in conjunction with the main shaft, and a connecting rod arranged between the first cam and the second cam, the connecting rod having a first shaft that cooperates with the first cam and a second shaft that is hinged to the second cam, and the first cam is formed with a movable groove for the first shaft to move therein.

[0007] The movable groove is an arc groove.

[0008] The technical solution of the utility model has the following advantages:

[0009] 1. The isolating grounding switch provided by the utility model has a positioning cam fixed on the main shaft and rotating in conjunction with the main shaft, a positioning groove is provided on the positioning cam, and a positioning plate is rotatably installed on the switch body, which has a positioning block matched with the positioning groove and a rotating arm matched with the driving arm, and the positioning plate has a locking position and an unlocking position. When the knife switch is in the opening position, the positioning plate is in the locking position, and the positioning block cooperates with the positioning groove to abut against each other, thereby positioning the main shaft and the knife switch in the opening position, thereby preventing the knife switch from rotating due to its own weight and causing arcing and burning; and before the knife switch rotates toward the closing position, the operating shaft drives the rotating arm to rotate through the driving arm, so that the positioning block switches to the unlocking position, drives the positioning block to separate from the positioning groove, and the positioning plate switches to the unlocking position, and then the operating shaft drives the main shaft to rotate through the connecting rod assembly to ensure that the knife switch can be closed.

[0010] 2. The isolating grounding switch provided by the utility model has a pin shaft installed at the end of the driving arm, and a roller sleeved on the pin shaft and driven by the driving arm, thereby reducing friction and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of the isolating grounding switch of the utility model (in the open state, the positioning plate is in the locked position);

[0013] Figure 2 It is a structural schematic diagram of the isolating grounding switch (the positioning plate is in the unlocked position);

[0014] Figure 3 for Figure 1 Schematic diagram of the structure after removing the connecting rod assembly;

[0015] Figure 4 Schematic diagram of the exploded structure of the main shaft, positioning cam and positioning plate.

[0016] Explanation of the accompanying drawings: 1. switch body; 2. operating shaft; 3. main shaft; 4. connecting rod assembly; 5. first cam; 6. second cam; 7. connecting rod; 8. first shaft; 9. second shaft; 10. movable groove; 31. positioning cam; 32. positioning groove; 33. positioning plate; 34. driving arm; 35. positioning block; 36. rotating arm; 37. torsion spring; 38. pin; 39. roller. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the internal communication of 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.

[0020] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example

[0022] This embodiment provides an isolating grounding switch, such as Figure 1 As shown, it includes a main shaft 3, an operating shaft 2, a connecting rod assembly 4 and a positioning plate 33.

[0023] The main shaft 3 is rotatably mounted on the switch body 1 and is used to drive the knife switch to open or close. Figure 3 and Figure 4 As shown, a positioning cam 31 is fixed on the main shaft 3 and rotates in conjunction with the main shaft 3 , and positioning grooves 32 are respectively provided on both sides of the positioning cam 31 .

[0024] The operating shaft 2 is connected to the main shaft 3 through a connecting rod assembly 4. Figure 2 and Figure 3As shown, the operating shaft 2 has a driving arm 34 extending toward the positioning plate 33. The connecting rod assembly 4 includes a first cam 5 that rotates in conjunction with the operating shaft 2, a second cam 6 that rotates in conjunction with the main shaft 3, and a connecting rod 7 arranged between the first cam 5 and the second cam 6, the connecting rod 7 has a first shaft 8 that cooperates with the first cam 5, and a second shaft 9 that is hinged to the second cam 6, the first cam 5 is formed with a movable groove 10 for the first shaft 8 to move therein, and the movable groove 10 is an arc groove. It should be noted that the operating shaft 2 includes an isolation operating shaft and a grounding operating shaft that are arranged on the left and right sides of the main shaft 3, and the isolation operating shaft and the grounding operating shaft are respectively connected to the main shaft 3 through their respective connecting rod assemblies 4.

[0025] The positioning plate 33 is rotatably mounted on the switch body 1 through a torsion spring 37. The positioning plate 33 has a positioning block 35 that cooperates with the positioning groove 32, and a rotating arm 36 that cooperates with the driving arm 34. The positioning plate 33 has a locking position and an unlocking position. When the knife switch is in the opening position, the positioning plate 33 is in the position as shown in FIG. Figure 3 In the locked position shown in the figure, the positioning block 35 cooperates with the positioning groove 32 to abut against each other; before the knife switch rotates toward the closed position, the rotating arm 36 is driven by the driving arm 34 to drive the positioning block 35 to separate from the positioning groove 32, and the positioning plate 33 is switched to Figure 2 The torsion spring 37 has one end fixed to the switch body 1 and the other end fixed to the positioning plate 33. A pin 38 is mounted on the end of the driving arm 34, and a roller 39 sleeved on the pin 38 and driven by the driving arm 34. It should be noted that Figure 4 As shown, there are two groups of positioning plates 33 and torsion springs 37 . The two groups of positioning plates 33 are disposed on both sides of the main shaft 3 and can correspond to and abut against the positioning grooves 32 of the positioning cam 31 .

[0026] The working principle of the isolating grounding switch of the utility model is as follows (taking the grounding operating shaft as an example):

[0027] In such Figure 3 When the switch is in the open position shown in the figure, the positioning plate 33 is under the elastic force of the torsion spring 37 , and the positioning block 35 and the positioning groove 32 cooperate and abut against each other.

[0028] When closing the circuit breaker, the operating shaft 2 drives the driving arm 34 to rotate counterclockwise, and the driving arm 34 abuts against the rotating arm 36, thereby driving the positioning block 35 of the positioning plate 33 to separate from the positioning groove 32. The first cam 5 couples with the connecting rod 7 after following the operating shaft 2 to rotate a certain angle, that is, the upper end of the movable groove 10 abuts against the first shaft 8. The first cam 5 drives the main shaft 3 to rotate clockwise through the connecting rod 7 and the second cam 6.

[0029] The isolating grounding switch provided by the utility model has the following functions: when the knife switch is in the open position, the positioning plate is in the locked position, and the positioning block is in contact with the positioning groove in a matching manner, so as to position and hold the main shaft and the knife switch in the open position, thereby avoiding the situation that the knife switch rotates due to its own weight and causes arc ablation; before the knife switch rotates towards the closed position, the operating shaft drives the rotating arm to rotate through the driving arm, so that the positioning block switches to the unlocking position, drives the positioning block to separate from the positioning groove, and the positioning plate switches to the unlocking position. Then, the operating shaft drives the main shaft to rotate through the connecting rod assembly to ensure that the knife switch can be closed.

[0030] Obviously, the above embodiments are only examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. An isolating grounding switch, characterized in that: include: A main shaft (3) is rotatably mounted on the switch body (1) and is used to drive the knife switch to open or close. A positioning cam (31) is fixed on the main shaft (3) and rotates in conjunction with the main shaft. A positioning groove (32) is provided on the positioning cam (31); An operating shaft (2) connected to the main shaft (3) via a connecting rod assembly (4), wherein the operating shaft (2) has a driving arm (34) extending toward the positioning plate (33); A positioning plate (33) is rotatably mounted on the switch body (1), and comprises a positioning block (35) cooperating with the positioning groove (32), and a rotating arm (36) cooperating with the driving arm (34); the positioning plate (33) has a locking position and an unlocking position, wherein when the knife switch is in the opening position, the positioning plate (33) is in the locking position, and the positioning block (35) cooperates with and abuts against the positioning groove (32); before the knife switch rotates toward the closing position, the rotating arm (36) is driven by the driving arm (34) to drive the positioning block (35) to separate from the positioning groove (32), and the positioning plate (33) switches to the unlocking position.

2. The isolating and grounding switch according to claim 1, characterized in that: It also includes a torsion spring (37), one end of which is fixed to the switch body (1), and the other end of which is fixed to the positioning plate (33).

3. The isolating and grounding switch according to claim 1, characterized in that: A pin shaft (38) and a roller (39) sleeved on the pin shaft (38) and driven by the driving arm (34) are installed at the end of the driving arm (34).

4. The isolating and grounding switch according to claim 1, characterized in that: The connecting rod assembly (4) comprises a first cam (5) which rotates in conjunction with the operating shaft (2), a second cam (6) which rotates in conjunction with the main shaft (3), and a connecting rod (7) arranged between the first cam (5) and the second cam (6), wherein the connecting rod (7) has a first shaft (8) which cooperates with the first cam (5), and a second shaft (9) which is hinged to the second cam (6), and the first cam (5) is formed with a movable groove (10) in which the first shaft (8) can move.

5. The isolating and grounding switch according to claim 4, characterized in that: The movable groove (10) is an arc-shaped groove.

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