JP2009262031A - Centrifuge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifuge preventing the occurrence of abnormal sound with inexpensive and simple constitution. <P>SOLUTION: In the centrifuge wherein a plurality of dampers 5 elastically supporting a driving part 4 driving a rotary body (rotor) with respect to a frame 2 are constituted of a spring 9, spring holders 10, 11 supporting both ends of the spring 9, and a damping rubber 12 damping vibration of the spring 9 by integrally holding the spring 9 and spring holders 10, 11, elastic bodies 15, 16 are interposed between the spring 9 of the dampers 5 and the spring holders 10, 11 respectively. For example, the outer peripheries of the spring holders 10, 11 are covered with the cylindrical elastic bodies 15, 16, and the ends of the spring 9 are fitted to the outer peripheries of the elastic bodies 15, 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a centrifuge in which a drive unit that rotationally drives a rotating body such as a rotor is elastically supported on a frame via a plurality of dampers.

  The centrifuge is a device that rotates a rotating body such as a rotor at a high speed by a driving unit and centrifuges a sample accommodated in the rotating body, but the driving unit is elastically supported on the frame by a plurality of dampers, The vibration generated in the drive unit is absorbed and attenuated by the damper so that the vibration does not propagate to the frame.

4 shows the structure of a conventional damper. The damper 105 includes a spring 109 that is compressed or extended by vibration, spring holders 110 and 111 that support both ends of the spring 109, and the spring 109 and the spring holder 110. , 111 are held together to form a damping rubber 112 that attenuates the vibration of the spring 109.
Japanese Utility Model Publication Sho 62-114654

  However, in the conventional damper 105 shown in FIG. 4, when the vibration of the drive unit 104 resonates with the spring 109, abnormal noise is generated due to the spring 109 repeatedly colliding with the spring holders 110 and 111, which are generally made of metal. There was something to do. At this time, if there is no gap between the spring 109 and the spring holders 110 and 111, no noise is generated. However, in actual production, the inner diameter dimension of the spring 109 and the outer diameter dimension of the spring holders 110 and 111 are set. It is very difficult to manage with high accuracy, and there is a problem that the cost increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a centrifuge capable of preventing the generation of abnormal noise with an inexpensive and simple configuration.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of dampers that elastically support a drive unit that rotationally drives a rotating body with respect to a frame, a spring, and a spring holder that supports both ends of the spring, In the centrifuge configured by a damping rubber that damps the vibration of the spring by holding the spring and the spring holder integrally, an elastic body is interposed between the spring of the damper and the spring holder. Features.

  According to a second aspect of the present invention, in the first aspect of the invention, the cylindrical elastic body is crowned on the outer peripheral portion of the spring holder, and the end of the spring is fitted on the outer periphery of the elastic body. It is characterized by that.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the outer periphery of the spring is covered with a cylindrical spring cover made of an elastic body.

  According to the first and second aspects of the present invention, since the elastic body is interposed between the spring of the damper and the spring holder, the spring and the spring holder are not affected even when the vibration of the drive unit resonates with the spring. Generation of abnormal noise is prevented because there is no metal contact. Such an effect can be obtained with an inexpensive and simple configuration in which an elastic body is interposed between the spring and the spring holder.

  According to the third aspect of the present invention, the resonance of the spring is suppressed by the vibration control action of the spring cover coated on the outer periphery of the spring, and the propagation of vibration to the frame and the generation of abnormal noise can be more effectively prevented. .

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a centrifugal separator according to the present invention, and FIG.

  In the centrifuge 1 shown in FIG. 1, a bowl 3 is accommodated in an upper half of a box-shaped frame 2, and a drive unit 4 having an electric motor is disposed below the frame 2 via a plurality of dampers 5. It is elastically supported at the bottom. The upper surface of the bowl 3 is opened, and the upper surface opening is opened and closed by a door 6 that is rotatably connected to the upper portion of the frame 2 by a hinge (not shown).

  A rotating shaft 7 extending vertically upward from the driving unit 4 passes through the bottom of the bowl 3 and faces the inside of the bowl 3, and a rotor 8 as a rotating body is detachably attached to the upper end of the rotating shaft 7. Yes.

  Thus, when the rotor 8 is rotationally driven in the bowl 3 by the drive unit 4 at a predetermined speed, the sample accommodated in the rotor 8 is subjected to centrifugal separation processing, and the rotational vibration of the drive unit 4 causes a plurality of rotational vibrations. It is absorbed and damped by the damper 5 and the propagation of vibration to the frame 2 is prevented.

  Next, details of the configuration of each damper 5 will be described with reference to FIG.

  The damper 5 includes a spring 9 that compresses or extends by vibration, spring holders 10 and 11 that support upper and lower ends of the spring 9, and integrally holds the spring 9 and the spring holders 10 and 11 to vibrate the spring 9. It is comprised by the damping rubber 12 which attenuates. Here, screw holes 10 a, 11 a are respectively penetrated at the center of each spring holder 10, 11, and through holes 12 a, 12 b are formed at the upper and lower centers of the damping rubber 12, respectively. A through hole 4 a is formed in the flange portion 4 A of the drive unit 4, and a through hole 2 a is formed in the bottom of the frame 2.

  The damper 5 having the above-described configuration has an upper spring holder with bolts 13 inserted from above into a through hole 4a formed in the flange portion 4A of the drive unit 4 and a through hole 12a formed in the upper portion of the damping rubber 12. 10 is fixed to the drive unit 4 by being screwed into a screw hole 10a formed in the screw 10. The lower portion of the damper 5 is formed in the lower spring holder 11 with a bolt 14 inserted from below into a through hole 2a formed in the bottom of the frame 2 and a through hole 12b formed in the lower portion of the damping rubber 12. It is fixed to the frame 2 by being screwed into the screw hole 11a.

  Thus, this embodiment is characterized in that elastic bodies 15 and 16 such as rubber are interposed between the spring 9 of the damper 5 and the spring holders 10 and 11, respectively. More specifically, elastic bodies 15 and 16 integrally molded in a cylindrical shape with rubber are respectively crowned on the outer peripheral portions of the spring holders 10 and 11, and the upper and lower sides of the spring 9 are placed on the outer peripheries of the elastic bodies 15 and 16. The end is fitted.

  In the centrifuge 1 according to the present embodiment, when the rotor 8 is driven to rotate at high speed by the drive unit 4 as described above during the centrifuge processing of the sample, the rotational vibration generated in the drive unit 4 is In the embodiment, since the elastic bodies 15 and 16 are interposed between the spring 9 of each damper 5 and the spring holders 10 and 11, even if the vibration of the drive unit 4 resonates with the spring 9, Since the spring holders 10 and 11 are not in metal contact, the generation of abnormal noise is prevented. Such an effect can be obtained with an inexpensive and simple configuration in which the elastic bodies 15 and 16 are interposed between the spring 9 and the spring holders 10 and 11.

  The application of the present invention is not limited to the embodiment described above, and various modifications and improvements can be made within the scope described in the claims. For example, as shown in FIG. 3, if the outer periphery of the spring 9 of the damper 5 is covered with a cylindrical spring cover 17 made of an elastic body, the vibration of the spring cover 17 suppresses the resonance of the spring 9, and the frame Propagation of vibration to 2 and generation of abnormal noise are more effectively prevented.

It is a longitudinal cross-sectional view of the centrifuge which concerns on this invention. It is a block diagram which fractures | ruptures and shows a part of damper. It is a block diagram which fractures | ruptures and shows a part of damper which concerns on another form. It is a block diagram which fractures | ruptures and shows a part of conventional damper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Centrifuge 2 Frame 2a Frame through-hole 3 Bowl 4 Drive part 4A Drive part flange part 4a Drive part through-hole 5 Damper 6 Door 7 Rotating shaft 8 Rotor 9 Spring 10, 11 Spring holder 10a, 11a Screw hole 12 Damping rubber 12a, 12b Damping rubber through hole 13, 14 Bolt 15, 16 Elastic body 17 Spring cover

Claims (3)

A plurality of dampers that elastically support the drive unit that rotationally drives the rotating body with respect to the frame, a spring, a spring holder that supports both ends of the spring, and the spring and the spring holder are integrally held to hold the spring. In a centrifuge composed of damping rubber that damps vibrations,
A centrifugal separator characterized in that an elastic body is interposed between a spring of the damper and a spring holder.   The centrifuge according to claim 1, wherein the cylindrical elastic body is crowned on an outer peripheral portion of the spring holder, and an end portion of the spring is fitted on the outer periphery of the elastic body. The centrifuge according to claim 1 or 2, wherein the outer periphery of the spring is covered with a cylindrical spring cover made of an elastic body.

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