KR101579248B1

KR101579248B1 - Circuit breaker for transformer equipment

Info

Publication number: KR101579248B1
Application number: KR1020150069552A
Authority: KR
Inventors: 백중현; 손종열; 최선열
Original assignee: 현우전기(주); 명진전력(주); (주)창성이엔지
Priority date: 2015-05-19
Filing date: 2015-05-19
Publication date: 2015-12-21
Also published as: KR20150073144A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a circuit breaker for a transformer leg, and more particularly, to a circuit breaker for a transformer circuit which improves the degree of freedom of design by simplifying the structure and increases safety by increasing the dustproof function.
According to the present invention, not only the structure is simplified, the degree of freedom of design is increased, but also the safety function is improved by increasing the dustproof function.

Description

Circuit breaker for transformer equipment

[0001] The present invention relates to a circuit breaker for a transformer leg, and more particularly, to a circuit breaker for a transformer leg, which not only improves the degree of freedom of design by simplifying the structure of a circuit breaker for a transformer leg, Breaker.

Generally, in order to reduce power loss during power transmission, power is transmitted at a high voltage, and the power transmitted must be transformed to an appropriate voltage before being supplied to the consumer.

For this reason, power demand sites, whether urban or suburban, are equipped with transformers or substations.

In this case, the transformer is an integrated device in which most of the devices are housed in a single container, which is a device for down-converting electric power transmitted at a relatively low voltage to a voltage required by a user and delivering it directly to a consumer.

On the other hand, a substation is a plant for supplying power to a customer through a transformer, a breaker, and other devices by feeding the power transmitted from a power plant to a relatively high voltage, and it is necessary to process a high voltage power. It is very strong.

Therefore, in order to prevent arcing or interference, and to maintain safety, the elements and the lines must be sufficiently separated or sufficiently insulated.

In addition, the substation can be divided into an outdoor substation and an indoor substation depending on the installation location. In a suburban area where the building density per unit area is low, space occupancy costs are lower than insulation cost, The outdoor substation is advantageous because it is advantageous in cost and easy installation.

On the other hand, in urban areas with a high density of buildings per unit area, insulation cost is lower than space occupancy cost, so it is economically advantageous to sufficiently insulate between elements and lines, Insulated switchgear type indoor substation is installed.

In addition, the breaking device used for protecting the electric circuit of the substation in the class of the high voltage system or higher is composed of a load switch disconnecting the load current or the fault current, a disconnecting part for cutting off the line during testing or inspection, And a ground contact switch.

That is, a gas insulated switchgear (GIS) is a main component of a substation, such as a gas circuit breaker (GCB), a disconnection switch (DS), an earthing switch (ES), a lightning arrester, Main bus), etc. It has excellent insulation performance inside and fills inactive SF6 gas to make miniaturization and safety of the substation.

The breaker (GCB) of the gas insulated switchgear (GIS) is roughly classified into a pneumatic-vacuum-operating mode and a spring-operating mode according to a shut-off portion operating mode.

At this time, the electronic pneumatic pressure operation method has an advantage that a large operation force can be obtained by using a fluid or a gas as a working fluid, but it is not only difficult to operate but also has a disadvantage that the airtightness of the pneumatic pressure must be stably maintained, There is a disadvantage that the performance is not uniform depending on the temperature.

On the other hand, the latter type of spring operating method uses elasticity as a blocking and input energy source, which has advantages in that it is easier to maintain the operating force and to manage the operating device compared to the pneumatic-vacuum operating method using fluid and gas. However, The difficulty in installation in a limited space and the degree of freedom of design are severely limited. Especially, the maintenance is poor.

Accordingly, Patent No. 0714458 (Apr. 26, 2007) has been disclosed as a circuit breaker for a power plant that can increase the efficiency by increasing the degree of design freedom while reducing restrictions on installation space.

Since the driving force of the motor is transmitted by a plurality of gears, the operation reliability is high and the structure is simple, so that the overall volume can be made slimmer, thereby limiting the installation space.

Recently, earthquakes and other natural disasters have been continuing due to global environmental changes. Especially, Korea, which is a member of the Pacific Rim Earthquake, is not safe from earthquakes. Therefore, Seismic design was required.

However, most of the important equipments such as electric power transmission and distribution are designed and installed irrespective of seismic resistance, so it is required to be supplemented.

SUMMARY OF THE INVENTION [0006] The present invention has been made in view of the above-described problems in the prior art, and it is an object of the present invention to provide a circuit breaker having a circuit breaker, And to provide an earthquake-resistant circuit breaker with enhanced resistance to earthquakes that can prevent earthquake accidents and human accidents by enabling seismic design.

According to an aspect of the present invention, there is provided a motor for a motor vehicle, comprising: a motor provided within a casing; A direction switching gear group 2 composed of a first bevel gear 2a connected to the rotation shaft of the motor 1 and a second bevel gear 2b engaged thereto; A worm gear group (3) composed of a worm shaft (3a) integrally coupled to the second bevel gear (2b) and a worm wheel (3b) meshed therewith; A forward and reverse ratchet 4 provided at one side of the worm wheel 3b with a predetermined interval therebetween and a forward and reverse ratchet 4 selectively engaged with one side of the worm wheel 3b so as to be rotatable about the worm wheel 3b, A shaft 5 on which a forward latch groove 5a is formed; A crank 6 provided integrally rotatably at one end of the shaft 5 and a tension spring 7 connected at one end to the crank 6 and at the other end to the casing c to exert an elastic force; A joint (8) formed on one side of the shaft (5) and having a protruding portion formed on one side thereof; And a protrusion engaging with the protrusion of the joint 8 is formed on one side of the shaft 5 to provide a switching force by rotating in a forward and reverse direction. One end of the protrusion protrudes to the outside of the casing c An out-shaft 9 machined in a square; A two-bar link 10, one end of which is connected to one side of the out-shaft 9 and is lifted and lowered by interlocking, and a bracket b that rotatably supports the other end of the two- And a limiter limit (11) for selectively generating a signal by contact upon ascending and descending of the link (10) and determining the rotating direction of the motor (1) A vertical rack 24 is formed on the inner surface of the vibration proof guide piece 22 and a pinion gear 34 is fixed to the vertical rack 24 And the pinion gear 34 is rotatably fixed to the outside of one side of the dustproof housing 40. The first spur gear 34 is coaxial with the pinion gear 34, And the first spur gear 42 is fixed to the inside of the vibration-proof housing 40 by a second spur gear 44, And the first and second spur gears 42 and 44 are connected to the gear chamber 46 and the gear chamber 46 of the oil chamber 48 by the inner space of the dustproof housing 40 partitioned by the partition wall W, And the inlet of the oil chamber 48 toward the gear chamber 46 is narrower than the inlet of the gear chamber 46 in the partition wall W which is an interface between the gear chamber 46 and the oil chamber 48. [ Wherein at least one of the first communication holes 50 is formed at an arbitrary position between the first communication holes 50 and the inlet of the oil chamber 48 is connected to the second communication hole 50, A spring fixing protrusion 26 protrudes from the center of the lower end surface of the dustproof guide piece 22 and an upper end of the dustproof spring 28 is inserted into the spring fixing protrusion 26 The lower end of the vibration-proof spring 28 is fixed to the upper surface of the vibration-damping plate 30. The lower end of the vibration-damping plate 30 is fixed to the lower end of the vibration- Shaped seismic housing 60 is welded and fixed to both sides of the seismic housing 60. The rotating shaft 62 protrudes from both sides of the seismic housing 60, And a horizontal rack 66 is coupled to the drive pinion 64 in a lower support form and the lower center bottom of the horizontal rack 66 is connected to a horizontal support And the horizontal bar 70 is fixed on the mounting surface BT and the movable bar 72 is fixed on the rotary shaft 62 inside the vibration-proof housing 60, And is rotatable together with the rotating shaft 62. A pair of half-moon-shaped flow pieces 74 are provided with the movable bar 72 interposed therebetween. On the outer peripheral surface of each of the flow pieces 74, 76) are integrally fixed to the circuit breaker The ball.

At this time, the upper and lower ends of the pair of flow pieces 74 are resiliently connected and connected to each other through connection springs 78.

According to the present invention, not only the structure is simplified, the degree of freedom of design is increased, but also the seismic function is enhanced to enhance the safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary configuration diagram illustrating a configuration of a circuit breaker for a substation leg according to the present invention. FIG.
2 is a cross-sectional view showing the line "AA" in Fig.
3 is a cross-sectional view showing the line "BB" in Fig.
FIG. 4 is a view showing a configuration of a main part of a worm wheel constituting a circuit breaker for a substation leg according to the present invention.
FIG. 5 is a view illustrating an example of a recessed portion connected to an outshaft of a circuit breaker for a substation leg according to the present invention.
6 is an exemplary view for explaining an operation state of a two-link link interlocked with an out-shaft of a circuit breaker for a substation leg according to the present invention.
FIG. 7 is an exemplary view showing an earthquake-proof and dust-proof structure of a circuit breaker for a substation leg according to the present invention.
8 is an enlarged view of the main part of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Particularly, the main feature of the present invention is to increase the safety of the circuit breaker for a transformer leg by increasing the dustproof property of the breaker of the No. 0714458 mentioned above in the prior art.

To this end, the circuit breaker for a substation leg according to the present invention includes a motor 1 for selectively generating a forward or reverse rotational force according to a power supply, as shown in FIGS. 1 to 6.

The motor 1 is rotated by a group of direction switching gears 2. The group of direction switching gears 2 is rotatably supported by a first bevel gear And a second bevel gear 2b that meshes with the first bevel gear 2a and performs a directional change at an angle of about 90 degrees to receive a rotational force.

The worm gear group 3 is connected to the worm gear 3 and the worm gear 3 so that the second bevel gear 2b is supported on one side of the worm gear 3, (3a) and a worm wheel (3b) coupled to the worm shaft (3a) and receiving a rotational force.

The worm wheel 3b constituting the worm gear group 3 is provided with a regular ratchet 4 at a predetermined interval on one side thereof and a worm wheel 3b constituting the worm gear group 3 And a shaft 5 on which one or both of the forward and reverse latch grooves 5a are formed so that the forward and reverse rotatable latches 4 are selectively engaged and rotated together.

One end of the shaft 5 is rotatably and integrally provided with a crank 6 rotated eccentrically. One end of the crank 6 is connected to the crank 6 and the other end of the crank 6 is connected to one side of the casing c, And a joint 8 in which a protrusion is formed on one side of the shaft 5 is formed as a disc-shaped member which is axially coupled to one side of the shaft 5 in a rectangular fitting structure.

In addition, the shaft 5 is provided with an out-shaft 9 which is disposed coaxially with the protrusion of the joint 8 at one side thereof to form a protrusion engaging with the protrusion of the joint 8, and provides a switching- One end of the outshaft 9 protrudes out of the casing c and is machined into a rectangular shape.

Particularly, a two-bar link 10 is connected to one side of the outshaft 9, one end of the two-bar link 10 is connected to an out shaft 9 and is elevated by interlocking, The other end of the link 10 is rotatably supported by the bracket b and a signal is generated on the bracket b by selective contact when the two-link 10 is moved up and down, The limit limit 11 is determined.

Preferably, the limit limit 11 includes a circuit for determining the rotational direction of the motor 1 during the next start of the motor 1 through selective contact with the two-link 10. [

Each of the above-described configurations is constructed such that all the charging parts are built in the grounded casing (c) and isolated by sulfur hexafluoride (SF6) gas, thereby eliminating the risk of electric shock and reducing deterioration or abrasion.

In addition, it is preferable that the structure as described above is completely separated and assembled by units so as to be easy to install, and is preferably configured to be completely closed by an outer frame so as not to be affected by salting, dust, Do.

In addition, the circuit breaker for a substation leg according to the present invention further includes a dustproof unit and an earthquake-resistant unit having a special structure as shown in FIGS. 7 and 8 so as to attenuate vibrations caused by external factors.

7 to 8, the dustproof unit includes a dustproof guide piece 22 fixedly protruded downward from the lower end of the casing c.

The vibration damping guide piece 22 is an elongated square-shaped member integrally fixed to the center of the four sides of the lower end of the casing c, and protrudes toward the lower end of the casing c.

In particular, a vertical rack 24 is formed on the inner surface of the dustproof guide piece 22, that is, the surfaces facing each other.

A spring fixing protrusion 26 protrudes from the lower end surface of the dustproof guide piece 22 and the upper end of the dustproof spring 28 is inserted into the spring fixing protrusion 26, And is fastened to the lower end.

In addition, the lower end of the anti-vibration spring 28 is firmly fixed to the upper surface of the anti-vibration plate 30.

Here, it is particularly preferable that the anti-vibration spring 28 is formed in a conical shape in order to enhance the installation stability and to increase the buffer absorption power.

The pinion gear 34 is engaged with the vertical rack 24.

The pinion gear 34 is rotatably fixed to the outside of the one-side dust-proof housing 40 of the dust-proof housing 40, and the first pinion gear 34 is coaxial with the pinion gear 34, A spur gear 42 is provided.

The first spur gear 42 is meshed with the second spur gear 44 in the inside of the dustproof housing 40 and the first spur gear 42 and the second spur gear 44 are coupled to the dust- And an internal space is disposed on the gear chamber 46 partitioned by the partition walls W.

That is, the dustproof housing 40 has a gear chamber 46 in which the first and second spur gears 42 and 44 are installed with respect to the partition wall W, an oil chamber 48 in which oil is mainly filled, . Of course, since the gear chamber 46 is also filled with oil, the gear chamber 46 is referred to as a differential gear chamber.

At least one first communication hole 50 is formed in the partition wall W which is an interface between the gear chamber 46 and the oil chamber 48 so that the gear chamber 46 and the oil chamber 48 Can communicate with each other.

At this time, the first communication hole 50 is formed to have a wide inlet and a narrow outlet to allow a buffering function when oil flows from the gear chamber 46 to the oil chamber 48, The rate of perfusion should be slowed down.

Then, when the oil flows to the oil chamber 48 due to the rotation of the gears due to sudden shock or vibration, the oil flows to the oil chamber 48 due to the overpressure. So as to prevent the rotation of the gears by preventing them from falling over easily so as to cushion shocks. This means that the buffering effect is generated by the operation in association with the vertical rack 24.

In addition, in order to naturally relieve the pressure when a predetermined time passes, at an arbitrary position between the partition walls W, preferably the first communication holes 50, the entrance to the oil chamber 48 is wide and the gear chamber The second communication hole 52 having a narrow entrance at the side of the second communication hole 46 is further formed.

In addition, the oil chamber 48 is further provided with an oil filling port 54 so as to be able to replenish the oil.

Meanwhile, the circuit breaker for the transformer installation according to the present invention, that is, the circuit breaker, further includes an earthquake-resistant unit.

The earthquake-resistant unit includes a plurality of, preferably four, earthquake-resistant housings 60 fixed to the lower end surface of the vibration-

The earthquake-resistant housing 60 is preferably arranged in a direction in which a seismic wave is transmitted when an earthquake occurs according to a design diagram in consideration of the installation position (topography) of the circuit breaker.

At this time, the housing 60 is formed in a cylindrical shape, and a part of the outer circumferential surface of the housing 60 is welded and fixed to the lower end surface of the vibration-

On both sides of the seismic housing 60, a rotating shaft 62 protrudes through the both sides, and a driving pinion 64 of the same size is fixed to each rotating shaft 62 protruded on both sides.

In addition, a horizontal rack 66 is coupled to the driving pinion 64 in a lower supporting manner, and the pair of horizontal racks 66 are provided on both sides of the length of the housing 60 as shown in FIG.

The horizontal lower end of the horizontal rack 66 is integrally fixed to the horizontal support 70 vertically through the vertical linkage 68 and the horizontal support 70 is firmly fixed on the installation surface BT do.

In this case, although the fixing of the horizontal support 70 is not shown, an anchor bolt can be used for a concrete floor, and a fixing bolt can be used for a flat plate or a frame.

In other words, the installation surface BT may be a concrete bottom surface, or a side surface of a frame or a plate.

A movable bar 72, which is fixed on the rotating shaft 62 and is convex at its center, is fixed to the inside of the seismic housing 60 so as to be rotatable together with the rotating shaft 62, And a pair of semicylindrical flow pieces 74 spaced apart from the bar 72. The pair of flow pieces 74 are disposed with the movable bar 72 interposed therebetween.

The frictional pad 76 is integrally fixed to the outer circumferential surface of the flow piece 74 so as to be in contact with the inner circumferential surface of the seismic housing 60.

Hereinafter, the operation of the circuit breaker for a substation leg according to the present invention will be described.

1, the motor 1 is supplied with power from the outside to generate a one-way rotational force. The rotational force of the motor 1 is transmitted to the first bevel gear 2a connected to the rotational axis of the motor 1, And the second bevel gear 2b meshed with the first bevel gear 2a interlockingly rotate.

Then, the worm shaft 3a of the worm gear group 3 in which the second bevel gear 2b is fitted is rotated integrally to rotate the worm wheel 3b in one direction.

The normal ratchet 4 fixed to the worm wheel 3b rotates integrally with the worm wheel 3b while the worm wheel 3b rotates and the normal ratchet 4 is rotated by a normal ratchet groove formed at one side of the shaft 5 The shaft 5 rotates to a position at which the crank 6 reaches the apex of the shaft 5, as shown in FIG.

On the other hand, as the shaft 5 rotates, the crank 6 fixed to the shaft 5 rotates integrally and rotates. As the crank 6 rotates, the tension spring is stretched and stretched.

At this time, when the crank 6 rotates to reach the apex, the tension spring 7 which has been elongated rotates the shaft 5 by its force while making elastic return.

At the same time, the joint 8 fixed to the shaft 5 rotates integrally with the shaft 5. At this time, an outshaft 9 is formed on the joint 8, So as to be engaged with each other and rotate.

Here, the outshaft 9 is extended so that one side thereof is exposed to the outside of the casing (c), and the end thereof is processed into a square shape, and the end of the outshaft 9 is connected to a power- .

Since this configuration is implemented by a known technique, detailed configuration and explanation are omitted.

3 and 6, the two-link link 10 connected to one side of the outshaft 9 is vertically elevated to selectively contact the limit limit 11, .

Then, the longitudinal limit 11 selectively generates a signal by contact with the two-bar link 10, and based on this signal, the rotation direction of the motor 1 described above is determined in the next driving.

The operation of the bevel gear group and the worm gear group 3 causes the shaft 5 and the crank 6 and the two-link link 10 connected thereto to rotate the outpost by a predetermined angle The reliability of the operation due to the simplification of the configuration is assured.

In addition, when a strong vibration occurs due to various external factors, the vibration is mainly transmitted through the mounting surface (BT).

Since the flow of the vertical racks 24 in the vertical direction is generated by the combination of the pinion gear 34 and the pinion gear 34, a sharp rotation of the pinion gear 34 causes a sharp rotation of the first and second spur gears 42 and 44 So that the oil in the gear chamber 46 does not escape therefrom and is eventually driven to the first communication hole 50. When the instantaneous pressure is increased and the rotational speed of the first and second spur gears 42 and 44 .

As a result, rapid cushioning occurs, which protects the casing (c) from vibration.

When a certain period of time has elapsed, the oil moves naturally to balance the pressure imbalance within the gear chamber 46 and the oil chamber 48, thereby maintaining the equilibrium state while eliminating the internal pressure imbalance.

As a result, the circuit breaker according to the present invention can protect the casing (c) from the influence of strong vibration of external force, thereby improving the safety, increasing the durability, and extending the life of the internal components because they are not deformed or deteriorated by the influence of vibration , It is possible to prevent equipment accidents and personal injury in advance.

In addition, when the installation surface (BT) is vibrated by the influence of an earthquake, the installation surface (BT) flows in the transmission direction of the seismic wave because the seismic waves are transmitted horizontally not by simple vertical vibration.

Such a situation takes place in a very short time, and since the energy transfer is great, the horizontal pedestal 70 instantaneously moves the horizontal rack 66 instantaneously in the lateral direction, that is, in the direction of propagation of the seismic waves.

At the same time, the drive pinion 64, which is engaged with the horizontal direction rack 66, is rotated to rapidly rotate the rotating shaft 62. This causes the movable bar 72 to rotate rapidly, 74 and the friction piece 74 is brought into close contact with the inner circumferential surface of the seismic housing 60 to block the rotation.

Since the vibration of the mounting surface BT is not transmitted to the upper portion of the seismic housing 60 but is absorbed (converted into frictional force, heat, sound, etc.) of the friction pad, the casing (c) Can be protected.

Of course, when the rotating shaft 62 is not rotated rapidly, the flow piece 74 is opened at a proper line, so that there is no problem in operation.

In this case, the pair of flow pieces 74 do not have any problem in exhibiting an earthquake-proof function even if they are not mutually constrained, but the upper and lower ends of the flow pieces 74 are connected to connection springs 78 ) To be elastically constrained to each other.

1: motor 2: direction switching gear
3: Worm gear group 4: Rear ratchet
5: shaft 6: crank
7: Tension spring 8: Joint
9: Out shaft 10: 2 section link
11: Limit Limit

Claims

A motor (1) provided inside the casing (c) to generate a rotational force selectively in the forward and reverse directions by receiving power; A direction switching gear group 2 composed of a first bevel gear 2a connected to the rotation shaft of the motor 1 and a second bevel gear 2b engaged thereto; A worm gear group (3) composed of a worm shaft (3a) integrally coupled to the second bevel gear (2b) and a worm wheel (3b) meshed therewith; A forward and reverse ratchet 4 provided at one side of the worm wheel 3b with a predetermined interval therebetween and a forward and reverse ratchet 4 selectively engaged with one side of the worm wheel 3b so as to be rotatable about the worm wheel 3b, A shaft 5 on which a forward latch groove 5a is formed; A crank 6 provided integrally rotatably at one end of the shaft 5 and a tension spring 7 connected at one end to the crank 6 and at the other end to the casing c to exert an elastic force; A joint (8) formed on one side of the shaft (5) and having a protruding portion formed on one side thereof; And a protrusion engaging with a protrusion of the joint 8 is formed at one side of the shaft 5 to provide a switching force by rotation in a forward and reverse directions, and one end of the protrusion protrudes outside the casing c An out-shaft 9 machined in a square; A two-bar link 10, one end of which is connected to one side of the out-shaft 9 and is lifted and lowered by interlocking, and a bracket b that rotatably supports the other end of the two- And a limiter limit (11) for selectively generating a signal by contact upon ascending and descending of the link (10) and determining the rotating direction of the motor (1) A vertical rack 24 is formed on the inner surface of the vibration proof guide piece 22 and a pinion gear 34 is fixed to the vertical rack 24 And the pinion gear 34 is rotatably fixed to the outside of one side of the dustproof housing 40. The first spur gear 34 is coaxial with the pinion gear 34, And the first spur gear 42 is fixed to the inside of the vibration-proof housing 40 by a second spur gear 44, And the first and second spur gears 42 and 44 are connected to the gear chamber 46 and the gear chamber 46 of the oil chamber 48 by the inner space of the dustproof housing 40 partitioned by the partition wall W, And the inlet of the oil chamber 48 toward the gear chamber 46 is narrower than the inlet of the gear chamber 46 in the partition wall W which is an interface between the gear chamber 46 and the oil chamber 48. [ Wherein at least one of the first communication holes 50 is formed at an arbitrary position between the first communication holes 50 and the inlet of the oil chamber 48 is connected to the second communication hole 50, A spring fixing protrusion 26 protrudes from the center of the lower end surface of the dustproof guide piece 22 and an upper end of the dustproof spring 28 is inserted into the spring fixing protrusion 26 The lower end of the vibration-proof spring 28 is fixed to the upper surface of the vibration-damping plate 30. The lower end of the vibration-damping plate 30 is fixed to the lower end of the vibration- Shaped seismic housing 60 is welded and fixed to both sides of the seismic housing 60. The rotating shaft 62 protrudes from both sides of the seismic housing 60, And a horizontal rack 66 is coupled to the drive pinion 64 in a lower support form and the lower center bottom of the horizontal rack 66 is connected to a horizontal support And the horizontal bar 70 is fixed on the mounting surface BT and the movable bar 72 is fixed on the rotary shaft 62 inside the vibration-proof housing 60, And is rotatable together with the rotating shaft 62. A pair of half-moon-shaped flow pieces 74 are provided with the movable bar 72 interposed therebetween. On the outer peripheral surface of each of the flow pieces 74, 76) are integrally fixed to each other.

The method of claim 1,
Wherein upper and lower ends of the pair of flow pieces (74) are resiliently connected to each other through connection springs (78).