JPS6334202Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a relay having an induction disk, and more particularly to a relay having an induction disk configured to prevent malfunction due to vibration, such as an overcurrent relay.

Heretofore, one of these types of devices has been the one shown in FIGS. 1 and 2 of the accompanying drawings. FIG. 1 is a side view of the conventional device, and in the figure, reference numeral 1
is a rotating shaft, 2 is a holding element attached to the rotating shaft 1, 3 is a guide disk fixed to the rotating shaft 1 by the holding element 2, and 4 is attached to the lower end of the rotating shaft 1. A lower pin 5 is a lower bearing that supports the rotating shaft 1 from below, 6 is a bearing stone fixing part attached to the inside of this lower bearing 5, 7 is fixed to this bearing stone fixing part 6, and the lower pin 4 is fixed to the bearing stone fixing part 6. a lower bearing stone whose upper surface forms a concave surface that is in point contact with the tip of the bearing stone; 8 is a push spring that supports the bearing stone fixing part 6;
9 is a ring that holds the bearing stone fixing part 6 inside the lower bearing 5, 10 is a lower frame that fixes the lower bearing 5, 11 is an upper bearing fixed to the upper end of the rotating shaft 1, and 12 is an upper A frame 13 is an upper pin fixed to the upper frame 12 and supports the upper bearing 11 from above. Figure 2 is the first
1 is a top view of the conventional device shown in FIG.
Further, reference numeral 14 is a driving iron core that is attached close to the induction disk 3 and has a main coil and a slow phase coil wound thereon, and 15 is a braking magnet that is attached close to the induction disk 3; 16 has one end fixed to the rotating shaft 1 and the other end fixed to the spiral spring fixing part 1
A spiral spring fixed to 7, 18 a movable contact fixed to the rotating shaft 1, 19 a fixed contact that forms a pair with the movable contact 18 and comes into contact when the movable contact rotates clockwise by a certain angle, 20 is a stopper attached to prevent the guide disk 3 from rotating counterclockwise beyond a certain level due to the restoring force of the spiral spring 16.

Next, the normal operation of this device will be explained.

When an alternating current flows through the main coil wound around the driving iron core 14, due to the effect of the slow phase coil, a clockwise rotational force that correlates with this current value is generated in the induction disk 3. When this rotational force exceeds the spring force of the spiral spring 16, the guide disk 3 starts rotating clockwise. When the induction disk 3 rotates, an eddy current is generated in the induction disk 3 by the braking magnet 15, and this brakes the rotational speed of the induction disk 3. Therefore, when a current of a predetermined value or higher flows through the main coil for a predetermined time or longer, the movable contact 18 and the fixed contact 19 of the induction disk 3, which are fixed to the rotating shaft 1 to which the induction disk 3 is fixed, come into contact with each other. The relay is rotated to the position shown in Figure 2, and the relay operation is performed.

Normally, it operates like this, but since this device is generally used by being attached to a control panel installed inside a building, if the ground vibrates due to an earthquake, etc., this vibration will cause damage to the building and control panel. Due to the vibration response characteristics of When a force is generated and this rotational force acts clockwise, the rotating shaft 1 rotates and the movable and fixed contacts 18 and 19 come into contact, and the relay is activated, even if no overcurrent flows through the main coil. In addition, when this rotational force acts counterclockwise, even if an overcurrent flows through the main coil, the movable and fixed contacts do not come into contact and the relay does not operate, resulting in a malfunction.

Next, the cause of the above abnormal rotational force will be explained with reference to FIGS. 3A and 3B of the attached drawings.

FIG. 3 is an enlarged view of the contact area between the lower bearing stone 7 and the lower pin 4. When this device is subjected to large vibrations as described above, the lower pin 4
The contact point between the lower pin 4 and the lower bearing stone 7 moves from the center C of the lower bearing stone 7 to the contact point P.
At this time, since the center of gravity of the rotating part is at the center O of the lower pin 4, an inertial force N acts on the center O, while a drag force F from the lower bearing stone 7 acts on the contact point P. As a result, a force couple is generated, and an abnormal rotational force is generated on the rotating shaft 1 regardless of the current flowing through the main coil, causing the above-mentioned phenomenon.

The present invention aims to eliminate the drawback of malfunctions in conventional devices and to provide a relay having a highly reliable induction disk that does not cause malfunctions even when subjected to vibrations due to earthquakes, etc. That is the purpose.

In order to achieve this objective, the present invention provides a relay having an induction disk, which includes a lower bearing stone with a concave upper surface provided on the lower frame, and a lower bearing stone provided on the upper frame on the center line of the lower bearing stone. A lower pin is provided between the upper pin, the lower bearing stone and the upper pin, and has a point contact with the upper surface of the lower bearing stone at the lower part, and an upper surface which is in point contact with the upper pin at the upper surface, forming a concave surface. The invention is characterized in that it is equipped with a rotating shaft to which a guide disk is fixed and has an upper bearing stone.

Hereinafter, the present invention will be explained based on FIG. 4 of the accompanying drawings showing one embodiment thereof.

In the figure, a rotating shaft 1, a holding element 2, a guiding disk 3, a lower pin 4, a lower bearing 5, a bearing stone fixing part 6, a lower bearing stone 7, a push spring 8, a ring 9, a lower frame 10, and an upper frame 12 are shown. It is completely the same as the conventional device described above, and reference numeral 21 designates an upper bearing having the same structure as the lower bearing 5 provided at the upper end of the rotating shaft 1 and the holding element 2. A push spring 8 provided, a bearing stone fixing portion 6 pushed up and supported by the push spring 8,
An upper bearing stone 7' is provided on the bearing stone fixing part 6 and is configured with a concave surface facing upward, which is formed in the same shape as the concave surface of the upper surface of the lower bearing stone 7;
A ring 9 that holds the bearing stone fixing part 6 in the upper bearing 21 so that the bearing stone fixing part 6 does not pop out from the upper bearing 21 is housed. Also,
Reference numeral 22 denotes an upper pin having the same tip shape as the lower pin 4, which is fixed to the upper frame 12, and whose tip is in contact with the concave surface of the upper part of the upper bearing stone 7'.

The device of the present invention is configured as described above, but the amount of axial pressure applied to the upper bearing stone 71 inside the upper bearing ₂₁ by the upper pin 22 is A, the rotating shaft 1, the holding element 2, and the guiding force. The center of gravity of the rotating part consisting of the disc 3, the lower pin 4 and the upper bearing 21 is G, the weight of this rotating part is W, the distance l ₁ from the tip of the lower pin 4 to the center of gravity G, and the center of gravity of the upper pin 22 is Assuming that the distance from the tip to the center of gravity G is _l2 , when horizontal acceleration due to vibration etc. acts on the device of the present invention, the lower pin 4 and the lower bearing stone 7 are The ratio of the horizontal force acting on the contact portion between the upper pin 22 and the upper bearing stone 7 ₁ is l ₁ /l ₂ .
On the other hand, the axial pressure amount of (A+W) is applied to the contact area between the lower pin 4 and the lower bearing stone 7, and the axial direction pressure amount A is applied to the contact area between the upper pin 22 and the upper bearing stone ₇₁ . Since the amount of pressure is acting, l ₁ , l ₂ , A, W are
When they are set to a value that satisfies the relationship A+W/A=l ₁ /l ₂ , the rotation axis 1 moves in parallel in the horizontal direction in response to the horizontal acceleration acting on the device of the present invention. However, the lower pin 4 and the upper bearing stone 7' provided inside the upper bearing 21 move in the same direction and the same distance. That is, since the lower pin 4 and the upper bearing stone 7' move in unison, if the lower pin 4 is shifted toward the right in the drawing of the lower bearing stone 7, the upper bearing stone 7' will also be shifted toward the right. Therefore, the upper pin 22 is on the left side of the upper bearing stone 7'. the result,
For the lower pin 4 and the upper pin 22, the contact points between the lower bearing stone 7 and the upper bearing stone 7' are located at symmetrical positions with respect to the center of their respective concave surfaces. Therefore, as explained with reference to FIG. 3, rotational forces of equal magnitude and opposite directions are generated in the lower pin 4 and the upper pin 22,
As a result, since the rotational forces cancel each other out, a phenomenon in which rotational force is generated due to vibrations does not occur as in conventional devices.

In the above embodiment, the top and bottom pins 22 and 4 have the same tip shape, and furthermore, the lower bearing 5 and the upper bearing 2
1 and has the same structure as the upper and lower bearing stones 7, 7'.
The concave surfaces of the upper pins 2 and 2 are of the same shape, but they are not necessarily of the same shape.
2 tip shape, lower pin 4 tip shape, upper bearing 2
1. Concave shape of upper bearing stone 7' inside, lower bearing 5
If the concave shape of the inner lower bearing stone 7 is appropriately selected, the rotational force generated in the upper bearing 21 and the lower bearing 5 can be canceled out, and the same effect as in the above embodiment can be obtained. .

Furthermore, in the above explanation, the case where the device of the present invention is used to prevent malfunctions due to vibration in overcurrent relays has been described, but it goes without saying that the device is not limited to this and can be used for other relays having induction discs. do not have.

The relay having an induction disk according to the present invention is constructed and operates as described above, so that it can prevent abnormal rotational force from occurring even when horizontal acceleration due to vibration etc. is applied. This has the effect of preventing malfunctions due to

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional side view illustrating the main parts of an example of a conventional overcurrent relay, Fig. 2 is a top view illustrating the main parts, and Fig. 3 shows the operation of a conventional overcurrent relay when it is subjected to vibration. In the explanatory diagrams shown, A is a side view and B is a side view.
4 is a plan view, and FIG. 4 is a partially sectional side view illustrating the main parts of an embodiment of a relay having an induction disk according to the present invention. In the figure, 1... rotating shaft, 3... guiding disk,
4...Lower pin, 5...Lower bearing, 6...Bearing stone fixing part, 7...Upper bearing stone, 7'...Upper bearing stone,
8... Pressing spring, 9... Ring, 10... Lower frame, 12... Upper frame, 13, 22... Upper pin, 14... Driving iron core, 15... Braking magnet, 1
8...Movable contact, 19...Fixed contact, 21...Upper bearing.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a relay, a lower bearing stone with a concave upper surface provided on the lower frame, an upper pin provided on the upper frame on the center line of the lower bearing stone, and the lower bearing A lower pin is provided between the stone and the upper pin, and has a lower pin that is in point contact with the upper surface of the lower bearing stone at the lower part, and an upper bearing stone that has a concave upper surface that is in point contact with the upper pin at the upper part. 1. A relay having an induction disk, characterized in that it is equipped with a fixed rotating shaft such as an induction disk. (2) A relay having an induction disk according to claim 1, wherein the tips of the upper and lower pins have the same shape, and the upper concave surfaces of the upper and lower bearing stones have the same shape. (3) The amount of pressing force between the upper pin and the upper bearing stone, the weight of the rotating part, and the distance from the center of gravity of the rotating part to the tip of the upper and lower pins are (Amount of pressing force of the upper pin against the upper bearing stone) + (Weight of rotating part) / (Amount of pressure applied by upper pin to upper bearing stone)
Claims 1 or 2 of the utility model registration claim are structured so that the relationship is: = distance from the center of gravity of the rotating part to the tip of the lower pin/distance from the center of gravity of the rotating part to the tip of the upper pin Relay with induction disk. (4) The relay having an induction disk according to any one of claims 1 to 3 of the utility model registration claim, wherein the relay having an induction disk is an overcurrent relay.