JPS6226536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed adjusting device used, for example, to adjust the closing and closing speed of a vacuum switch.

In a vacuum switch, there are restrictions on the opening/closing speed of the electrodes, and proper, disconnection (opening) speed, and closing (closing) speed values are specified. In order to comply with this regulation, conventional vacuum switches have been equipped with a closing speed regulator to ensure that the electrode impact speed (closing speed) at the time of closing is at an appropriate speed. In order to remove the impact energy (the shear breaking speed is about twice as fast as the input speed), a separate sheath breaking speed regulator was used. That is, conventionally, two speed regulators were required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a speed regulator that can reliably adjust two different speeds using a single regulator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where an embodiment of the present invention is applied to a vacuum switchgear will be described below with reference to the drawings.

In FIGS. 1 to 3, 1 is a vacuum switch;
2 is a fixed electrode of the vacuum switch 1, and 3 is a movable electrode. 4 is a press-contact spring mechanism, and one end 4a of this mechanism 4 is connected to the movable electrode 3. A connecting rod 7 connected to the piston shaft 6 of the regulator 5 shown in FIG.
A spring 4b of the mechanism 4 is elastically mounted between one end 7a and one end 4a of the mechanism 4. 8 is a link mechanism, one end of a first lever 8a of this link mechanism 8 is pivotally supported by a connecting rod 7, and the other end is fixed to a second lever 8c and pivotally supported by a fulcrum 8b. The second lever 8c of the link mechanism 8 is pivotally supported by a fulcrum 8b near the center, one end is pivotally connected to the armature spring mechanism 9, and the other end is pivotally supported to one end of the third lever 8d. The other end of the third lever 8d is pivoted near the center of the fourth lever 8e. A roller 1 is provided at both ends of the fourth lever 8e.
0 and 11 are provided. 12 is a tripping hook, 1
3 is a spring, 14 is a stopper, and 15 is a hook. Reference numeral 16 denotes a cylinder body of a closing air operating mechanism, and a piston 17 is housed in this cylinder body 16 together with a return spring 18. Reference numeral 19 denotes an air supply side cylinder chamber, and 20 denotes an exhaust side cylinder chamber. 24 is a compressed air generator, 25 is a valve, 2
6 is an exhaust port. In addition, Figure 1 shows the vacuum switch 1.
FIG. 2 shows the closed state of the vacuum switch 1, and FIG. 2 shows the closed state of the vacuum switch 1.

FIG. 3 is a sectional view showing details of the regulator 5,
In FIG. 3, reference numeral 31 denotes a cylinder containing a predetermined amount of fluid therein, and this cylinder 31 is partitioned into first and second cylinder chambers 33 and 34 by a partition plate 32. As shown in FIG. A chamber 33 is located at the bottom of the first cylinder chamber 33.
A recess 35 having a diameter smaller than the diameter of the chamber 33 is formed, and a plurality of grooves 36 are formed in the upper side wall of the chamber 33. The partition plate 32 is movably fitted into a recess 37 formed in the side wall of the cylinder 31 via a seal 38. Reference numeral 39 denotes a first orifice, and a plurality of first orifices 39 are bored in the partition plate 32. 40 is a return spring housed within the second cylinder chamber 34. Reference numeral 41 denotes a piston that moves up and down within the first cylinder chamber 33, and this piston 41 is led out to the outside of the cylinder 31 via the piston shaft 6. The lower part of the piston 41 has the first
Projection 4 that can fit into the recess 35 of the cylinder chamber 33
2 is provided in a protruding manner, and a recessed portion 43 is bored in this protruding portion 42 . 44 is a second orifice bored in the radial direction of the protrusion 42;
is in communication with the recess 43. The piston 41
A plurality of communication holes 45 are bored in the axial direction.
Reference numeral 46 denotes a disc-shaped check valve fitted into the piston shaft 6, and the check valve 46 is formed so that the communication hole 45 is closed when the piston 41 is moved upward. A plurality of through holes 47 are bored in the check valve 46 . 48 and 49 are seals, and 50 is a fixed terminal.

Next, the operation of the above embodiment will be described. Vacuum switch 1
2, the trip hook 12 is actuated to disengage the roller 10. Then, the piston 17 of the input air operating mechanism is moved to the left by the return spring 18, and the link mechanism 8 is moved from the state shown in FIG. 2 to the state shown in FIG.
The connecting rod 7 is lowered, and the pressure contact spring mechanism 4 is released from its stored force. This release causes the movable electrode 3 to separate, and this separation operation is performed as follows.
That is, since the piston shaft 6 of the speed regulator 5 is pivotally connected to the connecting rod 7, the downward speed of the connecting rod 7 is regulated by the speed regulator 5. The piston 41 of the speed regulator 5 is at the position shown in FIG. 4a when the shearing starts, but the piston 41 starts to move downward as the shearing starts. At this time, the fluid (oil) in the first cylinder chamber 33 flows through the communication hole 45 to lift up the check valve 46 as shown by the arrow in FIG. 4b, so the downward speed of the piston 41 is fast. However, the protrusion 4 of the piston 41
2 begins to be inserted into the recess 35 of the first cylinder chamber 33, the fluid in the recess 35 flows into the first cylinder chamber 33 through the second orifice 44 as shown in FIG. 4c. As the fluid passes through the second orifice 44 in this way, a buffering force acts on the piston 41, and the downward speed of the piston 41 becomes slower.
Figures 5a and 5b are graphic representations of the above operations, and Figure 5a is a sheath breaking operation force diagram, with the horizontal axis representing the stroke amount and the vertical axis representing the operational force. In Figure 5a, _S0 is the electrode insertion position, _S1 is the electrode release position, _S2 is the electrode shearing position, _S3 is the shearing operation force, and the shaded area in Figure 5a is the speed. This is the energy removed by regulator 5. Also, Figure 5b
This is a cross-sectional stroke diagram, with time on the horizontal axis and stroke position on the vertical axis. In FIG. 5b, S ₀ , S ₁ and S ₂ are at the same positions as in FIG. 5a. In FIG. 5b, the stroke speed (lowering speed) of the piston 41 changes from the position of the illustrated point _S4 (this position is the point at which the protruding portion 42 of the piston 41 starts to be fitted into the recess 35) as illustrated by the dotted line. The figure shows that the line draws a gentle curve and reaches the shear cutting position _S2 . If there is no speed regulator 5, the fifth
It is cut at a speed similar to the straight line in Figure b.

Next, a description will be given of changing the vacuum switch 1 from the closed state shown in FIG. 1 to the closed state shown in FIG. First, when the electromagnetic on-off valve 22 is opened and air is supplied into the air supply cylinder chamber 19, the piston 17 moves to the right, the link mechanism 8 is activated, the connecting rod 7 rises, and the pressure spring mechanism 4 causes the piston 17 to move to the right. The vacuum switch 1 is turned on as shown in FIG. At this time, the speed regulator 5 also starts operating. FIG. 4d shows the start of charging, and when the piston 41 starts to move upward, the fluid flows into the second cylinder chamber 34 through the first orifice 39 of the partition plate 32, so the upward movement speed of the piston 41 is becomes slower, ie a damping force is applied to the piston 41. When the piston 41 is moved upward, the lower part 51 of the piston 41 becomes evacuated as shown in FIG. 4e. The piston 41 is further moved upward and when the piston 41 reaches the position shown in FIG. Therefore, the buffering force acting on the piston 41 is eliminated, and the fluid that had been flowing into the second cylinder chamber 34 is sucked by the vacuum pressure of the first cylinder chamber 33 and passes through the second orifice 39 to the second cylinder chamber 34. It flows into the first cylinder chamber 33 and returns to the closing position shown in FIG. 4a.

Figures 6a and b are graphs showing the above operations, and Figure 6a is a closing operating force/load diagram, with the horizontal axis representing the stroke amount and the vertical axis representing the operating force (load). It is attached. FIG. 6b is a drawing stroke diagram in which time is plotted on the horizontal axis and stroke speed is plotted on the vertical axis. In FIGS. 6a and 6b, S ₅ is the electrode shearing position, S ₆ is the electrode contact position, and S ₇ is the electrode insertion position. _S8 means that the piston 41 is moved from the position shown in Figure 4 d to the fourth position.
This is a curve showing the movement state of the movable electrode 3 when it moves as shown in Figure f. From this curve _S8 , the movable electrode 3 initially
6a and 6b show that since a buffering force is generated in the piston 41, its speed is kept low and gradually increases until it collides with the fixed electrode 2 at an appropriate speed. In FIGS. 6a and 6b, the curve _S9 is without the conventional speed regulator 5, and the impact speed is too high. The shaded area in FIG. 6a is the energy removed by the speed regulator 5.

As mentioned above, in this embodiment, instead of the conventional speed regulator 5, which was provided for each time of turning on and off, only one speed regulator 5 was provided in Fig. 5 a, b, Fig. 6 a,
The effect shown in b can be obtained. In addition,
The buffering force at the time of cooling and closing can be arbitrarily set by adjusting the diameters of the first and second orifices 39 and 44. In particular, in the embodiment, when the vacuum switch is disconnected, a buffering force is generated before the shearing is completed to alleviate the impact energy when the shearing is completed, and when the vacuum switch is turned on, the excessive operating energy until the electrode collides is absorbed. It can be removed by the buffering force, the impact speed of the electrode can be made appropriate, and the vacuum switch and the entire equipment can be protected against impact.

As described above, according to the present invention, when the piston is moving downward, the downward movement speed is made gentle when the piston reaches a predetermined position after the downward movement, and when the piston is moving upward, the speed is gradually increased after starting the upward movement. Since it is formed to be fast, the speed of vertical movement can be reliably controlled with a single speed regulator, and the configuration is simple.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, and Figures 1 and 2 are explanatory diagrams showing the schematic configuration of the vacuum switchgear in the closed and closed states, and Figure 3 is an explanatory diagram of the vacuum switchgear in the closed and closed states. An enlarged cross-sectional view showing the main parts of the invention, Figures 4a to 4f are cross-sectional views showing the operation of Figure 3, Figures 5a and b are shear cutting force diagrams and shear cutting stroke diagrams. , FIGS. 6a and 6b are a closing operation force load diagram and a closing stroke diagram. 6... Piston shaft, 31... Cylinder, 32...
...Partition plate, 33, 34...First and second cylinder chambers, 35...Recess, 36...Groove, 39...First orifice, 40...Return spring, 41...Piston, 42...Protrusion Part, 43... recessed part, 44... second orifice, 45... communicating hole, 46... check valve, 47... through hole.

Claims (1)

[Claims] 1 Inside the cylinder 31, the first and second cylinder chambers 3
3 and 34, both chambers 33 and 34 are formed so that fluid can flow therethrough, and a plurality of grooves 36 are provided in the side wall of the first cylinder chamber 33 in the axial direction, and a piston 41 is provided in the first cylinder chamber 33. , and a recess 35 is provided on the bottom surface of the first cylinder chamber 33 , and a protrusion 42 that can be fitted into the recess 35 and has an orifice in the radial direction is provided to protrude from the lower part of the piston 41 . multiple communication holes 45 in
A disc-shaped check valve 46 is fitted into the shaft 6 of the piston 41 to allow fluid to flow through the communication hole 45 when the piston 41 is moving downward and to block fluid flow when the piston 41 is moving upward. The shaft 6 of the piston 41 is led out of the cylinder 31 through the second cylinder chamber 34, and when the piston begins to move downward, the check valve is pushed upward by the fluid passing through the communication hole. When the protrusion of the piston begins to fit into the recess, fluid flows through the orifice of the protrusion, slowing down the piston's downward movement, and when the piston begins to move upward, a check valve closes the communication hole. A speed adjusting device characterized in that the speed of upward movement and downward movement can be adjusted within a single cylinder by closing the cylinder and gradually increasing the speed of upward movement.