JPH0597027U - Position detection device for switchgear - Google Patents

Abstract

(57) [Summary] [Object] To easily detect an electrical operating position of a switchgear in a switchgear having an odd number of operating positions of 3 or more. [Structure] The levers 61 and 62 and the auxiliary switches 71 and 72 are provided symmetrically with respect to the shaft 5. The levers 61 and 62 are
It is a structure that is pushed downward by the cam portion 2a of the flat cam 2. The auxiliary switches 71 and 72 are switches having a plurality of a-contacts and b-contacts, and the contacts of the auxiliary switches 71 and 72 are moved by the cam portion 2a via the lever 61 or 62, and those a-contacts and The b-contact detects the electrical position of the switchgear.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a position detection device for an opening / closing device.

[0002]

[Prior Art]

 Conventionally, the electrical operating position of a switchgear having three operating positions is detected as shown in FIG. The lever 1 moves in conjunction with the operation of an opening / closing device (not shown) and stops at positions corresponding to the three operating positions of the opening / closing device. The lever 1 and the flat cam 2 are connected by a pin 3. The hole 1a through which the pin 3 of the lever 1 passes is an elliptical hole, and the movement of the flat cam 2 is restricted by the guide 4. Therefore, the flat cam 2 linearly moves according to the circular motion of the lever 1. The microswitches 111, 112, 113 are provided at respective operating positions where the cam portion 2a of the flat cam 2 stops. Rollers 111a, 112a, 113a are provided on the respective microswitches 111, 112, 113 so that the microswitches 111, 112, 113 can be operated smoothly with respect to the movement of the cam portion 2a of the flat cam 2. .. FIG. 4A shows a state in which the switchgear is in the first operating position. Only the micro switch 111 is operated by the cam portion 2a. Therefore, the contact of the microswitch 111 electrically detects that the switchgear is in the first operating position. FIG. 4B shows a state in which the switchgear is in the second operating position. In this state, the contacts of the microswitch 112 electrically detect that the switchgear is in the second operating position. Similarly, FIG. 4C shows a state in which the switchgear is in the third operating position. In this state, the contact of the microswitch 113 electrically detects that the switchgear is in the third operating position.

[0003]

[Problems to be solved by the device]

 The micro switch electrically displays the operating position of the switchgear with a lamp and operates the switchgear by a motor or the like. Therefore, conventionally, a micro switch that operates at each operating position of the switchgear is provided and the contacts are used. Normally, the micro switch is a 1C contact. Therefore, in this type of structure, at each operating position of the switchgear, it is necessary to provide microswitches at the respective positions for the number of contacts required for display, operation and control. Therefore, a large number of microswitches will be installed, and there is a disadvantage that the structure will be congested. In addition, one micro switch is arranged for each operating position, each operating position is detected by each micro switch, and the relay is activated to secure the required number of contacts at each operating position. In some cases. However, since the relay must be provided separately from the micro switch, there is a disadvantage that the space for the relay must be secured. Therefore, the present invention uses an auxiliary switch having a plurality of contacts to easily detect the electrical operating position of the switchgear.

[0004]

[Means for Solving the Problems]

 A cam that interlocks with the movement of the switchgear body is installed in the switchgear that has three operating positions. For two of the three operating positions, a lever operated by the cam is provided at each operating position. These levers are installed symmetrically with respect to one fulcrum axis. These two levers actuate the movement of the cam to actuate two auxiliary switches, each in linear motion. Each of these auxiliary switches has an a contact and a b contact, and the b contacts of these auxiliary switches are connected in series. The above is a case where the operating position of the switchgear is 3, but in general, in a switchgear having an operating position of (2N + 1) (where N is a positive integer), there are (2N) levers and auxiliary switches. , (N) fulcrums are provided.

[0005]

[Action]

 In the position detecting device of the present invention configured as described above, two of the three operating positions are detected by the operation of the a contact point of each auxiliary switch provided at each position. To be done. The remaining one operating position is detected by a circuit in which the b contacts of the two auxiliary switches are connected in series. Generally, in a switchgear having a position state of (2N + 1), the (2N) operating positions are detected by the a contacts of the (2N) auxiliary switches, and the remaining one operating position is (2N). ) It is detected by the circuit in which the b contacts of the auxiliary switches are connected in series.

[0006]

【Example】

 FIG. 1 shows a position detection device for a switchgear having three operating positions with N = 1 and 2N + 1 = 3. The lever 1 is a lever that moves in conjunction with the operation of the switchgear body (not shown) and stops at positions corresponding to the three operating positions of the switchgear. The lever 1 and the flat cam 2 are connected by a pin 3. The hole 1a through which the pin 3 of the lever 1 passes is elliptical. The movement of the flat cam 2 is restricted by the guide 4. Therefore, the flat cam 2 moves linearly. The shaft 5 is provided with levers 61 and 62 symmetrically. The levers 61 and 62 have a structure that can freely rotate with respect to the shaft 5. The levers 61 and 62 have rollers 61a and 62a, respectively, and move naturally with respect to the movement of the cam portion 2a of the flat cam 2. Further, auxiliary switches 71 and 72 are arranged symmetrically with respect to the shaft 5. The levers 61 and 62 are pressed against the flat cam 2 by the shafts 71d and 72d of the auxiliary switches 71 and 72, respectively. In the auxiliary switch 71, the shaft 71d is pushed upward by the compression spring 71e as shown in FIG. Further, the shaft 71d has two movable electrodes 71c1 and 71c3. The terminals 71b1 and 71b2 and the terminals 71b3 and 71b4 are electrically connected via the movable electrodes 71c1 and 71c3. By pushing the shaft 71d downward, the terminals 71a1 and 71a2 and the terminals 71a3 and 71a4 are electrically connected via the movable electrodes 71c1 and 71c3. The auxiliary opening / closing device 72 has the same structure as the auxiliary opening / closing device 71. Therefore, the auxiliary switches 71 1 and 72 2 each have two a contacts and two b contacts. Then, as shown in FIG. 3, the terminals 71b2 and 71b4 of the auxiliary switch 71 and the terminals 72b1 and 72b3 of the auxiliary switch 72 are connected in series, respectively. The states in which the switchgear is in the first, second and third operating positions are shown in FIGS. 1 (a), 1 (b) and 1 (c), respectively. In the first operating position, the shaft 71d is pushed downward by the cam portion 2a via the lever 61, so that the contact a of the auxiliary switch 71 is closed. Since the shaft 71d cannot be pushed downward in the second and third operating positions, the contact a of the auxiliary switch 71 is open. Therefore, the first operating position can be electrically detected by the a contact of the auxiliary switch 71. Similarly, since the contact a of the auxiliary switch 72 is closed only in the third operating position of the switchgear, the third position of operation can be electrically detected by the contact a of the auxiliary switch 72. When the switchgear is in the second operating position, the shafts 71d and 72d are pushed upward, so that the b contacts of the auxiliary switches 71 and 72 are both closed. In the first and third operating positions, only one of the b contacts of the auxiliary switches 71 and 72 is closed. Therefore, by connecting the b contacts of the auxiliary switches 71 and 72 in series, the second operating position can be electrically detected.

With the above-mentioned configuration, it is possible to electrically detect the three operating positions of the switchgear body with the two auxiliary switches. In the above example, two a-contacts and b-contacts of one auxiliary switch were provided, and two electrical contacts could be detected at each operating position. It is possible to increase the number of contacts at each operating position by increasing the number of contacts. Further, it can be applied to a switch device such as a tap changer having many operating positions. The present invention can also be applied to a device using a rotating cam instead of a linear moving cam.

[0008]

[Effect of the device]

 As described above, according to the present invention, it is possible to electrically detect each operating position of the switchgear having an odd number of operating positions of 3 or more. By using the auxiliary switch having a plurality of a-contacts and b-contacts, electrical position detection of each operating position can be taken out by a plurality of contacts. Therefore, it is not necessary to provide a plurality of micro switches for each operating position or increase the number of contacts via a relay as in the conventional case. In particular, it is an extremely effective means when it is an electrically operated switchgear that uses a motor or the like and multiple contacts are required for each operating position due to drive and interlock.

[Brief description of drawings]

FIG. 1 is a structural diagram showing an example of the present invention, in which (a) shows a first operating position, (b) shows a second operating position, and (c) shows a third operating position.

FIG. 2 is a structural diagram of an auxiliary switch used in the position detecting device of the present invention.

FIG. 3 is a connection diagram showing a connection of an auxiliary switch used in the position detecting device of the present invention.

FIG. 4 shows a conventional example, in which (a) shows a first operation position,
(B) is a structural diagram showing a second operating position, and (c) is a structural diagram showing a third operating position.

[Explanation of symbols]

 1 Lever 2 Flat cam 2a Cam part 3 Pin 4 Guide 5 Shaft 61,62 Lever 61a, 62a Roller 71,72 Auxiliary switch 71a, 72a Shaft

Claims (1)

[Scope of utility model registration request] 1. A switchgear having an odd number (3N + 1) operating positions of 3 or more, a cam interlocking with the movement of the switchgear body, and (2N) auxiliary members having a-contacts and b-contacts operated by linear motion. A switch, a lever (2N) that moves the auxiliary switch by the movement of the cam, and (N) shafts that serve as fulcrums for the lever are provided, and each is substantially symmetrical with respect to one shaft. One lever and one auxiliary switch are arranged, the b contacts of each auxiliary switch are connected in series, and the levers are arranged at the respective positions corresponding to the movement of the cam in the position state (2N). A position detecting device for a switchgear, characterized in that each auxiliary switch is operated via the.