KR100759596B1 - Ball balance for vertical rotor - Google Patents

Abstract

A ball balancer for a vertical rotor is provided to secure a stable rotary motion regardless of the rotational speed of the rotor by moving balls to the opposite direction of unbalance when the rotational speed of the rotor passing resonance speed is increased, by forming a curved part in a balancing space. In a ball balancer installed at a vertical rotor to keep balance when the rotor is turned, a body(1) has a cylindrical balancing space(12) formed inside and composed of an inclined part(122) extended from a bottom(121), a curved part(123) extended from the inclined part, and an upper large diameter part(124) extended from the curved part. Plural balls(2) are stored in the balancing space formed in the body.

Description

Ball balancer for vertical rotors {BALL BALANCE FOR VERTICAL ROTOR}

1 is a perspective view showing an example of a ball balancer according to the present invention,

2 is a cross-sectional view of the ball balancer shown in FIG.

Figure 3 shows the operating state of the ball balancer according to the present invention

   3A is a cross-sectional view showing when the rotor rotates at or below the resonance speed,

   3B is a cross-sectional view showing when the rotor rotates at a resonant speed,

   3C is a cross-sectional view showing when the rotating body rotates above the resonance speed,

4 is a cross-sectional view showing another example of the ball balancer according to the present invention;

5 is a cross-sectional view showing another example of a ball balancer according to the present invention;

6 is a cross-sectional view showing another example of a ball balancer according to the present invention;

Figure 7 shows the correlation between the direction of the force applied to the ball and the movement of the ball according to the rotation speed in the ball balancer according to the present invention

8A and 8B are partial cross-sectional perspective views showing an example of a conventional ball balancer.

<Description of the symbols for the main parts of the drawings>

1: body

  11: body

      111: shaft connection portion 111a: shaft hole

  12: balancing space

      121: floor 122: inclined portion 123: inflection portion 124: large diameter portion

  13: cover

2: ball

The present invention relates to a ball balancer, in particular, by forming an inflection in the balancing space in which the ball is stored and moved so that the movement speed of the ball is accelerated by the inflection portion at the moment the rotational speed of the rotating body passes the resonance speed The present invention relates to a ball balancer that can be stably rotated without vibrating during high speed rotation above the resonant speed as well as low speed rotation below the resonant speed.

In general, an unbalance amount exists in a rotating body of a rotating machine, and this unbalance amount not only affects the rotation speed much but also causes vibration and noise.

As a means for stabilizing the unstable rotation of the rotating body according to such an unbalance amount, a balancer is installed in the rotating body.

In particular, in the case of a rotating body that rotates at a high speed such as a centrifuge, such an unbalance amount is large, and a balancer that is used as a means for reducing the rotational speed or vibration and noise caused by such an unbalance amount is a ball balancer (ball balancer). There is a balancer.

An example of a conventional ball balancer is shown in FIGS. 8A and 8B.

The ball balancer shown in FIG. 8A is formed by installing a plurality of balls 20 in the casing 10 in which the balancing space 30 is formed in a circular ring shape, and a shaft hole 40 in which a rotating shaft is fixed is formed at the center thereof. It is.

The conventional balancer configured as described above is provided with a ball 20 so as to fill only a part of the balancing space 30 formed inside the casing 10, and an unbalance amount exists when the rotational speed of the rotating body is greater than or equal to the resonance speed. The ball 20 moves in the opposite direction to achieve a balanced rotation of the rotating body, but when the rotation speed is less than the resonance speed, the balls 20 rather move in a direction in which an unbalance amount exists, There was a problem that the rotation becomes more unstable.

To solve this problem, a ball balancer configured as shown in FIG. 8B has been developed and provided.

The balancer shown in FIG. 8B forms a balancing space 30a which is inclined toward the edge from the center of the hollow casing 10a and forms all of the groove portions at the edges of the balancing space 30a formed inside the casing 10a. It is configured by installing the amount of balls 20a to be filled.

The ball balancer configured as described above can prevent unstable rotation generated during low speed rotation generated by the balancer shown in FIG. 8A because the balls 20a are positioned at the same distance as the center of rotation when the rotational speed of the rotor is less than the resonance speed. have.

In addition, when the rotating body rotates at a high speed, the balls 20a are floated and moved to the opposite side of the unbalance amount, so that the rotating body can rotate in a stable state, thereby reducing vibration and thus reducing noise.

However, in the case of the ball balancer configured as shown in FIG. 8B, the balls 20a move in the opposite direction of the unbalance amount while the rotor starts to rotate at a low speed and rotates at a high speed beyond the resonance speed. It takes a long time, there was a disadvantage that such a momentary vibration can not be obtained a sufficient vibration damping effect.

The present invention is to solve the above problems, it is an object of the present invention to provide a ball balancer that can be stably rotated when the rotational speed of the rotating body is below the resonance speed, as well as the resonance speed and the resonance speed or more.

Furthermore, the present invention forms an inflection in the balancing space in which the ball is built so that when the rotating speed of the rotating body passes the resonance speed, the balls move quickly in the opposite direction of the unbalance amount to balance the rotation of the rotating body. An object of the present invention is to provide a ball balancer that can be stably rotated regardless of speed.

The present invention for achieving the above object is provided in the balancing means to maintain the balance during rotation of the rotating body, to form a cylindrical balancing space therein, the balancing space is extended with the inclined portion extending from the bottom A body configured to form an inflection portion so as to form an upper large diameter portion so as to extend from the inflection portion; Characterized in that it comprises a plurality of balls stored in the balancing space formed inside the body.

In addition, the ball balancer according to another aspect of the present invention, the balancing means is installed on the rotating body to maintain the balance during rotation of the rotating body, one side is open and form a cylindrical balancing space therein, the balancing space is the bottom A body composed of a main body configured to form an inflection portion formed to protrude inwardly at an end portion of the inclined portion extending from the upper portion, and an upper large diameter portion extending from the inflection portion, and a cover provided at an open end of the main body; It is characterized in that it comprises a plurality of balls stored in the balancing space inside the body.

Furthermore, the present invention forms a bottom of the balancing space formed in the body in a hemispherical shape to facilitate the movement of the ball according to the rotational speed, and to form a shaft coupling portion that is connected to the rotating shaft of the rotating body in the outer center of the rotating body It is characterized in that it is easy to combine with.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce.

1 is a perspective view showing an example of a ball balancer according to the present invention, Figure 2 is a cross-sectional view showing an example of a ball balancer according to the present invention.

As shown, the ball balancer according to the present invention is composed of a body 1 having a balancing space 12 and a plurality of balls 2 stored in the balancing space 12.

As shown in the figure, the body 1 is formed in a hollow cylindrical shape, and at one side thereof, a shaft connecting portion 111 is formed in which a shaft hole 111a is connected to the rotating body.

The balancing space 12 formed in the body 1 is formed in a cylindrical shape, and is configured to gradually widen upwards from the bottom 121, more specifically, of the inclined portion 122 extending from the bottom 121. An upper large diameter portion 124 is formed at an end portion to form an inflection portion 123 protruding toward the center and extend from the inflection portion 123.

Accordingly, the balancing space 12 is formed in a trumpet shape as a whole, and is rapidly formed between the inflection portion 123 and the upper large diameter portion 124.

The body 10 is configured by separating the lower body 11 and the upper cover 13, as shown in Figs. 1 to 5, and by combining the cover 13 to the main body 11 therein The ball 2 to be stored can be easily moved in and out.

That is, the lower main body 11 is configured by opening the surface toward the large-diameter portion 124 of the balancing space 12 formed therein and fixing the cover 13 to the open surface by fixing means.

The cover 13 may be fixed to the main body 11 by a fixing screw.

The bottom 121 of the balancing space 12 may be formed in a hemispherical shape as shown in FIGS. 4 and 5.

Thus, the inclined portion 122 extends from the bottom 121 formed in the hemispherical shape, and the inclined portion 123 is formed from the end of the inclined portion 122, thereby smoothly inclining from the bottom 121 to the inverted portion 123. This makes it possible to more smoothly move the moving ball 2 as the rotational speed of the rotating body is accelerated.

In the center of the outer surface of the main body 11 and the cover 13 constituting the body 1, as shown in FIG. 5, the shaft connecting portions 111 and 111 'are formed, respectively, regardless of the position of the rotating body. It was possible to install.

That is, when the balancer is installed on the upper end of the rotating body, the rotating body is connected to the shaft connector 111 formed on the main body 11, and when the balancer is installed on the lower part of the rotating body, the shaft connecting part 111 formed on the cover 13. The rotor can be connected to ').

In addition, the bottom 121 of the body 1 is formed through the bottom 121, the shaft hole 112 connected to the rotating shaft is formed, the end of the shaft hole 112, the stopper so as to be horizontal with the bottom 121 ( 113) was installed.

By forming a shaft hole through the bottom 121 as described above, the shaft is plugged into the shaft hole 112 so that the rotating shaft of the rotating body is coupled to the shaft hole 112 and the end of the coupled shaft is prevented from being exposed to the bottom 121. The top surface of the stopper was formed to be horizontal to the surface of the bottom 121 to allow the balls 2 to move smoothly.

In addition, when the bottom 121 is formed in a hemispherical shape, the surface of the stopper 113 is also formed to have an arc shape, thereby smoothly moving the ball 2.

Referring to the operation of the ball balancer according to the present invention configured as described above are as follows.

3 is a view showing the operating state of the ball balancer according to the present invention, Figure 7 is a graph showing the correlation between the direction of the force applied to the ball and the movement of the ball according to the rotation speed in the ball balancer according to the present invention .

When the rotor starts to rotate and its speed is equal to or less than the resonance speed, the balls 2 are uniformly distributed in the center of the balancing space 12 as shown in FIG. 3A, and the force by the balls is shown in FIG. As shown in), it extends in the direction toward the middle of gravity (Fg) and centrifugal force (Fr), but acts in a direction adjacent to gravity (Fg).

Therefore, the balancer rotates in a stable state by the balanced distribution of the balls.

When the rotating body is accelerated, the balancer also has a higher rotational speed and a higher rotational speed, so the centrifugal force acts on the ball 2 to move outward, but moves along the inclined portion 122 formed in the balancing space 12. The force direction, which is the force of gravity Fg and centrifugal force Fr, acts perpendicularly to the inclined portion 122 as shown in FIG. 7 (b), and by this force the balancer is directed downward. Stable rotation under the same force as being pressed.

When the rotor is further accelerated, the ball 2 moves along the inclined portion 122 as shown in FIG. 3B to the portion where the inflection portion 123 starts, and the direction of the force of the ball 2 is shown in FIG. As shown in (c) of FIG. 7, it acts in a direction very similar to the direction of the centrifugal force and moves to the large diameter portion 124 after passing through the inflection portion 123 in a short time.

In this process, the direction of the force of the ball (2) acts in the direction of pressing the balancer to stabilize the balancer and at the speed of passing the resonance speed, the balls (2) move to the opposite side of the unbalance amount instantaneously to achieve a stable rotation as a whole. This stability of vibrations reduces vibration and noise.

While the invention has been described with reference to the preferred embodiments, many modifications and variations are possible without departing from the scope and spirit of the invention as set forth by the claims below.

As described in detail above, the present invention has an effect of stably rotating when the rotation speed of the rotating body is below the resonance speed, as well as the resonance speed and the resonance speed or more, thereby reducing vibration.

In addition, the inflexion portion is formed in the balancing space in which the ball is embedded, and as soon as the rotor increases at the rotational speed passing through the resonance speed, the balls move in the opposite direction of the unbalance amount to balance, thereby relating to the rotational speed of the rotor. There is an effect that can be rotated stably without.

While the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from this description. Accordingly, the invention can only be construed limited by the words of the appended claims.

Claims (5)

In the balancing means that is installed on the rotating body to maintain the balance during rotation of the rotating body, A cylindrical balancing space 12 is formed therein, wherein the balancing space forms an inflection portion 123 continuously with the inclined portion 122 extending from the bottom 121, and an upper portion extending from the inflection portion 123. Body 1 and configured to form a large diameter portion 124; Ball balancer, characterized in that it comprises a plurality of balls (2) stored in the balancing space (12) formed inside the body (1). In the balancing means that is installed on the rotating body to maintain the balance during rotation of the rotating body, One side is opened and a cylindrical balancing space 12 is formed therein, wherein the balancing space 12 forms an inflection portion 123 continuously with the inclined portion 122 extending from the bottom 121, and the inflection portion A body 1 composed of a main body 11 formed by forming an upper large diameter portion 124 extending from the 123, and a cover 12 provided at an open end of the main body 11; Ball balancer, characterized in that it comprises a plurality of balls (2) stored in the balancing space (12) inside the body (1). The method according to claim 1 or 2, Bottom (121) formed in the interior of the body (1) is a ball balancer, characterized in that formed in a hemispherical shape. The method of claim 3, wherein The ball balancer, characterized in that the body (1) is further formed with a shaft coupling portion 111 is formed with a shaft hole (111a) is connected to the rotating shaft of the rotating body. The method of claim 4, wherein A shaft hole 112 is formed through the bottom 121 of the body 1 and connected to the rotating shaft, and a stopper 113 is installed at the end of the shaft hole 112 to be horizontal with the bottom 121. Ball balancer.

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