JPH02209639A - Frictional shock absorber - Google Patents

Abstract

PURPOSE:To consume kinetic energy by solid friction loss by providing sliding body which is connected with a driving source and its drill-like sliding surface is elastically deformed at receiving pressure, and a slide receiving body having a receiving face to press the sliding surface of the former, CONSTITUTION:A roller 51 is connected to an actuating lever 19 through a pin 52. When the roller 51 abuts on a sliding body 54, the sliding body 54 is penetrated into a slide receiving body 58 while pushing and contracting a holding spring 61. Accompanied with penetrating of the sliding body 54 into the slide receiving body 58, diameter of the slide receiving face 59 at the position of the sliding body 54 is gradually decreased, thereby the diameter of the sliding surface 55 is gradually decreased due to elastic deformation of the sliding body 54. Solid friction loss is generated due to the slip and the pressing force on the contact face between the sliding surface 55 and the slide receiving face 59. In this way, the kinetic energy can be consumed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shock absorbing device that absorbs impact force, and more particularly to a friction damper that absorbs the impact γ generated in conjunction with the operation of a switchgear.

[Prior Art] As described in Japanese Patent Publication No. 61-11421, for example, since switching devices generally have steep movements, most switching devices are equipped with some kind of M-impingement device.

Oil shock absorbers are often used as this shock absorber, but the shock absorber must not obstruct the steep movement of the switchgear at the beginning of the closing or shutting operation of the switchgear. It must have the property of exerting a buffering effect only in the final stage of the process.

A vacuum switch using a conventional oil shock absorber will be explained with reference to the drawings.

FIG. 6 is a diagram showing the closed state of the vacuum switch, and FIG. 7 is a partially enlarged view of the piston rond and the buffer piston inside the cylinder of the oil shock absorber.

(II) is the vacuum switch, (12) and (13) are the fixed electrode rod and movable electrode rod of the vacuum switch (11), respectively, (14) is the operating mechanism of the vacuum switch, and (15) is the movable electrode rod ( an insulating iron fixed to 13) and electrically insulating the vacuum switch (11) and the operating mechanism section (14);
(16) is the fixed electrode rod (1) when the vacuum switch is turned on.
2) a contact pressure spring (21) for applying a contact pressure load between the fixed electrode (17) provided at the tip of the movable electrode rod (13) and the movable electrode (18) provided at the tip of the movable electrode rod (13); operating axis,
(19) and (20) are actuating levers fixed to the operating shaft (21), and (22) is a release that biases the actuating levers (19) and (20) from the closed state to the closed state of the vacuum switch. Spring (23) is the operating lever (19) in the cut-off state
・Stopper (24) that defines the resting position of (20)
The oil shock absorber, (25) is the buffer piston of the oil shock absorber (24), and (26) is the piston rod, which has a long length at the connection part between the fitting (27) with the buffer piston (25) and the operating lever (19). It has a slide elongated hole (28) for acting as a hole link, and is connected to the actuation lever (19) by a pin (32). The buffer piston (25) has its outer periphery (
There is a pore (35) provided near the pore (33) and a bias hole (36) provided near the fitting (34) with the piston rod at the inner peripheral edge and having a larger diameter than the pore (35). At both ends of the fitting (27) of the piston rod, there is an M-impingement piston (25) whose diameter is larger than the diameter of the fitting (27) with the buffer piston on the side with the slide elongated hole (28).
) Tsuba A that covers only the bypass hole (36) when in close contact with (
29) and on the opposite side there is a buffer piston (25) whose diameter is larger than the diameter of the fitting (27) with the buffer piston.
) is provided with a flange B (:IO) that does not cover the pore (35) or the bypass hole (36) at all when in close contact with the holder. The distance between the two opposing surfaces of nA (29) and collar B (30) is formed to be larger than the thickness of the buffer piston (25), so that the buffer piston (25) can freely slide into this fitting part (27). It is fitted. (37) is the cylinder of the oil shock absorber (24), and its inner wall (38) is the outer edge (3) of the buffer piston.
3) and is formed to be slidable and rotatably supported at the branch (39). Cylinder (37
) is filled with hydraulic oil (40), and the buffer piston (25) separates oil chamber A (41) and oil chamber B (4).
2) It is divided into The operating shaft (2I) is connected to an operating mechanism (not shown), and by operating this operating mechanism, the vacuum switch is closed or closed.

Next, the operation will be explained.

When a disconnection operation is performed on the operating mechanism of the vacuum switch in the closed state shown in FIG. 6, the operating shaft (21) is moved clockwise by the tension of the release spring (22) and the operating force from the operating mechanism. Rotate. An operating lever (
19) and (20) rotate in the same direction as the operating shaft (21), the movable electrode rod (13) moves in the blocking direction, and the movable electrode (1
8) and the fixed electrode (17) are separated, and the electric circuit connected to the vacuum switch is opened. Piston rod (26)
is connected to the operating lever (19) through the slide elongated hole (28), so the oil shock absorber (24) is connected to the movable electrode rod until the pin (32) reaches the lower end surface (31) of the slide elongated hole (28). (13) There is no suppression of the movement. Operation axis (2
1) rotates and the pin (32) or slide elongated hole (28)
When reaching the lower end surface (31) of the piston rod (26) and the buffer piston (25), the return spring (26) is driven by the pin (32) and the return spring ( 43) Move while pressing down. The movement of the buffer piston (25) causes the oil chamber A (41
) is pushed by the buffer piston (25) and passes through the bypass hole (36) and the pore (35) to the oil chamber B.
(42), the buffer piston (25) slides the fitting part (27) of the piston loft to suppress the movement of the buffer piston (25), and is pressed against the collar A (29) and comes into close contact with the collar A. (29) is the bypass hole (36)
Since the hydraulic oil (40) moves only through the pore (35), the effect of suppressing the movement of the buffer piston (25) and piston rod (26) increases, and the hydraulic oil (40) moves only through the pore (35). Large viscous friction loss occurs.

This viscous friction loss is caused by a change in the kinetic energy stored in the operating mechanism (I4), operating mechanism, etc., so the impact that occurs at the moment the operating lever (20) contacts the stopper (23) is alleviated. Ru.

The closing operation, like the closing operation, is performed by an official's operation on the operating mechanism.

When a closing operation is performed on the operation mechanism of the vacuum switch which is in the cut-off state, the operating levers (19) and (20) fixed to the operation 1[h (21) rotate counterclockwise. pin(
Since the pin (32) is in contact with the lower end surface (31) of the slide elongated hole (28), the pin (32) does not drive the piston rod (26) and the operating lever (19) is in contact with the opening spring (22).
) while stretching the movable electrode rod (13) in the insertion direction.

On the other hand, the piston rod (26) is pushed together with the buffer piston (25) by the return spring (43) and moves in the same direction as the pin (32). As the buffer piston (25) moves, the hydraulic oil (40) in the oil chamber B (42) is pushed by the buffer piston (25) and passes through the small hole (35) to the oil chamber A (
41), the buffer piston (25) slides on the fitting part (27) of the piston rod and is pressed against the collar B (30) in order to suppress the movement of the buffer piston (25). When the buffer piston (25) leaves the collar A (29), the bypass hole (36) is unblocked, so the hydraulic oil (40) moves through the bypass hole (36) and the small hole (35), and the buffer piston Since the effect of suppressing the movement of (25) is reduced, the piston rod (26) and the buffer piston (25) are moved by the return spring (43) and do not suppress the operation of the actuating mechanism (14). In this way, the movable electrode (18) is brought into contact with the fixed electrode (17), the electric circuit connected to the vacuum switch is closed, and the closing operation is completed.

[Problem to be solved by the invention] Since the conventional shock absorber is configured as described above,
The piston rod and buffer piston of the oil shock absorber must be formed to be able to slide freely relative to each other, and the part where the piston rod passes through the cylinder must have a sealing structure for hydraulic oil, and the operating mechanism of the vacuum switch must also be sealed. and an oil buffer,
This had the disadvantage of making the structure complicated, such as requiring devices such as connecting with long hole links. In addition, the loss of viscous friction 84 depends on the viscosity of the hydraulic oil, and the viscosity of the hydraulic oil depends on the temperature of the hydraulic oil.As the temperature of the hydraulic oil changes, the buffering effect changes quantitatively, so vacuum switches, etc. In a switchgear using a switching element with a small opening/closing stroke, quantitative changes in the buffering effect due to changes in the temperature of the hydraulic oil will adversely affect the operating characteristics of the switchgear because it changes the operating speed of the operating mechanism. It also had the disadvantage of being influenced by Xi.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and is intended to provide a buffer with a simple structure and without quantitative fluctuations in the buffering effect due to temperature changes.

[Means for Solving the Problems] A shock absorber according to the present invention has a sliding body whose conical sliding surface elastically deforms when pressurized, and a sliding receiving surface that contacts and pressurizes this sliding surface. It consists of a sliding receiver.

[Operation] The shock absorber according to the present invention consumes kinetic energy by solid friction loss that occurs when the sliding surface of the sliding body and the sliding receiving surface of the sliding receiver slide.

[Embodiment of the Invention] A vacuum switch according to an embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a diagram showing the closed state of the vacuum switch, Fig. 2 is a perspective view showing the single sliding body of the friction damper, and Figs. 3, 4, and 5 are friction M showing another embodiment. It is a perspective view showing a single sliding body of the impactor. In the figure, the same reference numerals as those in FIG. 6 above indicate the same or have the same functions, and a description thereof will be omitted.

(51) is a roller and the operating lever (19) is a bottle (5).
2) Connected by. (53) is a buffer, (5
4) is a sliding body that has a conical sliding surface (55), and is arranged in two orthogonal directions from its end surface (56) to the sliding surface (55) so that the elastic deformation caused by the pressure applied thereto is an appropriate amount. A groove (57) is provided in. A sliding receiver (58) has a sliding receiving surface (59) facing the sliding surface (55).

(60) is a restoring means, and a holding spring (61) is disposed between the sliding receiving surfaces (59) and holds the sliding body (54) in the standby position.
and the sliding body (54) in the penetrating state in the sliding receiver (58).
) is released from the penetrating state and returns to the standby position. The buffer (53) is arranged so as to be in contact with the roller (51) or the sliding body (54) in a standby state at the end of the shutoff operation of the vacuum switch.

When a disconnection operation is performed on the operation mechanism (not shown) of the vacuum switch in the closed state shown in FIG. 1, the operation shaft (21) rotates clockwise. The operating levers (19) and (20) fixed to the operating shaft (21) rotate in the same direction as the operating shaft (21), move the movable electrode rod (13) in the blocking direction, and separate the movable electrode (18) and the fixed electrode. (17) are separated and the electric circuit connected to the vacuum switch is opened. When the roller (51) comes into contact with the sliding body (54), the sliding body (54) is moved by the holding spring (
61) and place it in the sliding receiver (58). As the sliding body (54) penetrates into the sliding receiving body (58), the sliding receiving surface (59) at the position of the sliding body (54)
Since the diameter of the sliding surface (55) gradually decreases, the diameter of the sliding surface (55) also gradually decreases due to the elastic deformation of the sliding body (54).

This elastic deformation of the sliding body (54) is caused by the pressing force generated on the contact surface between the sliding surface (55) and the sliding receiving surface (59). The sliding that occurs on the contact surface between the sliding surface (55) and the sliding receiving surface (59) due to the penetration of the sliding body (54) into the sliding receiving surface (58) and the pressing that occurs on the above contact surface are caused by force. Solid friction loss occurs due to the movement mechanism (
Since the kinetic energy stored in the operating mechanism (14) and the operating mechanism is changed, no impact is generated when the operating mechanism (14) and the operating mechanism are stopped.

The closing operation is performed by a closing operation on the operating mechanism section, similar to the closing operation.

When the closing operation is performed on the operating mechanism of the vacuum switch in the cut-off state, the operating lever (19) fixed to the operating shaft (21) is activated.
) and (20) rotate counterclockwise. Actuation lever (1
9) and (20) are rotated counterclockwise by the roller (51).
) and the sliding body (54) using a buffer (53).
does not inhibit the closing operation of the vacuum switch, and the operating lever (19) quickly moves the movable electrode rod (13) in the closing direction while stretching the release spring (22), moving the movable electrode (18) to the fixed electrode ( 17) and the electric circuit connected to the vacuum switch is closed.

On the other hand, in conjunction with the closing operation, the restoring means (60) causes the return rod (62) to release the penetrating state of the sliding body (54) in the sliding receiver (55) and return it to the standby position. . The holding spring (61) has a return rod that slides into the receiving body (58).
The sliding body (54) in the penetrating state is released from the penetrating state and returned to the standby position, and then held at that position. After the return rod (62) returns the sliding body (54), it returns to the standby position and the closing operation is completed.

The stroke of the shock absorber (53) depends on the slope formed by the sliding surface (55) of the sliding body (54) and the sliding surface (55) of the sliding body (54).
5) is determined by the compressive stiffness in the vertical direction. FIGS. 3 and 4 each show an example of means for causing an appropriate amount of elastic deformation of the sliding surface. (70) is a sliding body whose end surface A (71) and end surface B (72) are connected to the sliding surface (73).
), two sets of grooves A (74) and two grooves B (75) are provided in parallel in two orthogonal directions at a total of eight locations. (80) is a sliding body, and the body of the sliding body (
81), lid A (82), and lid B (83), the sliding body body (81) is formed hollow and has an end surface A (84).
) and end surface B (85) to the sliding surface (86), grooves A (87) and grooves B (88) are provided at equal intervals around the periphery thereof.

Each of the sliding bodies shown in Figures 2, 3, and 4 has a sliding surface basically shaped like a conical surface, but the body may also be made of a polyhedron. It is possible.

FIG. 5 is a diagram showing a sliding body made of a hexahedron. (90
) are sliding bodies with sliding surface A (91) and sliding surface B (92)
is made up of two opposing faces of a hexahedron, and these two faces form a wedge shape. Inside the sliding body (90) sandwiched between sliding surface A (91) and sliding surface B (92), grooves A (93) and grooves B (94) are formed on sliding surface A, respectively.
(91) and parallel to the sliding surface B (92) and the sliding body (9
0) is arranged so that its cross section is approximately W-shaped.

Although not shown, the sliding receiver used in combination with the sliding body (90) has a sliding receiving surface formed in a wedge shape facing sliding surface A (91) and sliding surface B (92). Needless to say, it is necessary to

In each of the embodiments described above, the sliding body may be formed to fit inside the sliding receiver, or the sliding receiver may be formed so as to fit inside the sliding body. Furthermore, the same effect can be obtained by forming the sliding receiver so that it is elastically deformed together with the sliding body, or so that only the sliding receiver is elastically deformed.

[Effects of the Invention] As described above, according to the present invention, the sliding body having the conical sliding surface constituting the shock absorber is a sliding bearing having a sliding receiving surface in contact with the sliding surface of the sliding body. Since kinetic energy is consumed by the solid friction loss that occurs when penetrating the body, it is possible to realize a shock absorber with a simple structure and extremely little quantitative variation in the shock absorbing effect due to temperature changes.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the closed state of a vacuum switch in one embodiment of the present invention, and FIGS. 2, 3, 4, and 5 are perspective views showing sliding bodies in different embodiments of the present invention, respectively. It is a diagram. FIG. 6 is a diagram showing a conventional vacuum switch in a closed state, and FIG. 7 is a partially enlarged view of a piston rod and a buffer piston of an oil shock absorber. In the figure, (11) is the vacuum switch, (I4) is the side part of the operating machine,
(24) is an oil buffer, (53) is a buffer, (54) is a sliding body, (58) is a sliding receiver, and (60) is a restoring means, respectively. In addition, the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa 2nd ri! i 5 to Figure 3 I z 1st flash Figure 4 Procedural amendment (voluntary) April 12, 1st year 2, Name of the invention 3, Name of the invention Relationship with the case Patent applicant residence Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Shiki
Moriya & Detailed description of the invention in the specification subject to amendment. & Contents of the amendment (1) In the 6th line of page 4 of the middle cylinder of the specification, "branch (to)" is corrected to "fulcrum (39)". (2) On page 4, line 16 of the same book, the phrase ``operating force from the operating mechanism section'' is corrected to ``the force of the contact pressure spring Q.'' (3) In the same book, page 10, line 5 of the same book, the phrase ``comes into contact with the sliding body (goods)'' is corrected to ``comes into contact with the sliding body (goods)''. 4. Agent address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] A friction buffer comprising a sliding body connected to a drive source and whose conical sliding surface elastically deforms when pressurized, and a sliding receiver having a sliding receiving surface that pressurizes the sliding surface of the sliding body.