JPS6013127Y2 - Hydraulic operating mechanism of switch - Google Patents

Description

[Detailed Description of the Invention] The present invention is an improvement of the hydraulic operating mechanism of the switch, which is characterized by making its response action quick and reliable, and downsized into a block shape.

The operation mechanism for operating a switch such as a circuit breaker using hydraulic pressure generally has a cylinder and an operation block separate from each other, resulting in a large size and sometimes unreliable operation.

The present invention has a cylinder built into the operation block to achieve miniaturization, quick operation, and reliable operation.

Next, the present invention will be explained in detail with reference to the drawings shown as an example of implementation.

Reference numeral 1 denotes an opening/closing terminal, and a contact portion 2 performs opening and closing.

The contact part 2 communicates via a rod 3 into an operating block 4 .

Inside the operating block 4 are a piston chamber 13, a main valve chamber 15'' and a valve chamber 17 that communicate directly with the piston chamber 13 through a large passage 14.
, an auxiliary piston chamber 19 and the main valve chamber 15'', a trip valve chamber 9' and a closing valve chamber 10' communicating therewith via a check valve 22 are formed, respectively.

A piston 5 is connected to the rod 3 in the piston chamber 13, a main valve 6 having a valve portion 15 is in the main valve chamber 15'', and a through hole 7' is bored in the valve chamber 17. Auxiliary valve 7
is connected to the auxiliary piston 8 in the auxiliary piston chamber 19.

Furthermore, a trip valve 9 and a closing valve 10 are provided in the trip valve chamber 9' and the closing valve chamber 10', respectively, and these are connected to the valve rod 1.
1 and 11', the opening and closing of each of the valves 9 and 10 is controlled manually or remotely, for example, by energizing the tripping coil 21 and the closing coil 20.

Furthermore, an accumulator 16 is connected to the front working surface 12' side of the piston 5, and a passage 17 is also connected to a valve chamber 17, which leads to a closing valve chamber 10' which is opened and closed by an auxiliary valve 7. ', and the passage 17'' between the auxiliary piston 8 connected to the auxiliary valve 7 is connected to the piston chamber 13 and the passage 13.
The auxiliary piston chamber 19 and the main valve chamber 15# communicate with each other through a passage 19'.

An oil pipe 23 is provided to discharge the piston chamber 13 by the valve portion 15 and the trip valve chamber 9' by the trip valve 9 into the oil tank 24.

Next, to explain its operation, in the closed state shown in FIG.
Since the pressure receiving area acting on the rear working surface 12 is larger than the pressure receiving area of the front working surface 12' excluding the diameter of the rod 3, the contact portion 2 stably opens and closes the opening/closing terminal 1. It is in pressure contact with the

Similarly, the main valve 6 and the auxiliary piston 8 are also stably positioned due to the difference in pressure receiving area.

In order to prevent the hydraulic pressure applied to the main valve operating surface 15' from decreasing due to leakage from the trip valve 9, etc., the hydraulic pressure is sent little by little through a narrow oil passage 13'.

Therefore, when opening this, the coils 20 and 21 are activated to close the trip valve 9 and close the input valve 10.

Then, as shown in FIG. 2, the trip valve chamber 9' and the passage 19
', the auxiliary piston chamber 19, the main valve chamber 15#, and the check valve 22 are pushed up and opened, and the hydraulic pressure between the closing valve 10 and the trip valve chamber 9' is transferred to the oil tank 24 via the oil pipe 23.
released within.

Then, the main valve 6 moves to the right due to the pressure of the front working surface 14', and the auxiliary piston 8 also moves to the right. During this time, the high and low pressures are communicated via the oil pipe 13'', which is a thin tube and does not move instantly. Therefore, there is no impact.

Then, as shown in FIG. 3, the auxiliary valve 7 opens the passage 17', and the hydraulic passage from the passage hole 7' of the auxiliary valve 7 is shut off when the valve 7 is closed. The hydraulic pressure in the passage 17', that is, the front auxiliary operating surface 18, disappears from between the valve portion working surface 14', that is, the piston chamber 13 and the passages 14, 13'.

Then, the piston 5 moves to the right due to the hydraulic pressure applied to the front working surface 12' of the piston 5, and as shown in FIG. 4, the opening/closing terminal 1 and the contact portion 2 are separated and opened.

However, in this case, the hydraulic pressure is applied to the working surface 12' of the piston 5, and the rear working surface 12 on the back side is in an open state communicating with the oil tank 24 through the oil pipe 23, so that the opening is stably maintained. Ru.

To change the state from the open state shown in FIG. 4 to the closed state shown in FIG. 1, the input valve 10 is opened and the trip valve 9 is closed as shown in FIG.

This operation allows the accumulator 1 to reach the input valve 10.
The hydraulic pressure coming from 6 passes through here and pushes up the spring of the check valve 22, enters the trip valve chamber 9', and moves the main valve 6 to the left.

Then, since the passage 19' is opened, hydraulic pressure is applied to the rear auxiliary working surface 18' of the auxiliary piston 8, and the auxiliary piston 8 moves to the left together with the auxiliary valve 7.

Thus, as shown in FIG. 6, the valve portion 15 of the main valve 6 closes to cut off the passage to the oil pipe 23, and the left side of the auxiliary valve 7 is opened to passages 17' and 13' by the passage of hydraulic pressure from its through hole 7'. Hydraulic pressure enters the piston chamber 13 through , causing the piston 5 to move to the left.

When the valve portion 15 is closed, the auxiliary valve 7 opens into the passage 1.
4 is closed, and the passage 14, the closing valve chamber 10', the check valve 22, the trip valve chamber 9', and the main valve chamber 15'' are all closed (see Figure 1 below). The check valve 22 is closed by the stored force of the spring.

Thus, the hydraulic pressure that has passed through the auxiliary valve 7 enters the piston chamber 13 exclusively through the passages 17'' and 13', pressurizes the rear working surface 12 of the piston 5, contacts the contact part 2, and closes the opening/closing terminal 1. Return to the state shown in Figure 1.

In the present invention, the main valve 6 is provided directly at the rear of the piston chamber 13 of the piston 5, so the fluidity of the hydraulic oil is good, and since the valve is located close to the main valve, quick operation can be obtained, and the whole valve is constructed in a block shape. Therefore, it can be made compact and has great practicality.

[Brief explanation of the drawing]

The figures show an embodiment of the mechanism of the present invention. Figure 1 is a cutaway front view of the main part in the closed state, Figures 2 and 3 are front views showing the opening operation, and Figure 4 is the open front view. Cutaway front view of main parts in polar state,
FIGS. 5 and 6 are front views showing the closing operation. Symbols: 1 is the opening/closing terminal, 2 is the contact part, 4 is the operation block,
5 is a piston, 6 is a main valve, 7 is an auxiliary valve, 8 is an auxiliary piston, 9 is a trip valve, 10 is a closing valve, and 11 is a cylinder block.

Claims (1)

[Scope of utility model registration request] In a contact part opening/closing operation device of a switch, a main valve is provided in a main valve chamber that communicates directly with a piston chamber on the rear working surface side of the piston that is directly connected to the contact part through a relatively large passage, and a main valve is provided on the passage side. and an accumulator in the piston chamber on the front working surface side of the piston.
communicates with a valve chamber having an auxiliary valve, and when the auxiliary valve operates, communicates with the auxiliary piston chambers on the front and rear working surfaces of the auxiliary piston connected to the passage and the auxiliary valve, respectively;
One of the closing valves operated by external operation and one of the trip valves communicating with the main valve working surface of the main valve communicate through a check valve, and the other closing valve is a valve chamber that is opened and closed by the auxiliary valve. familiar with
The other trip valve is connected to an oil pipe that is opened and closed by the valve portion of the main valve to release hydraulic pressure, and is connected to the piston chamber, the main valve chamber, the valve chamber,
A hydraulic operating mechanism for a switch in which the auxiliary piston chamber etc. are formed into a single block.