JP2005226713A - Vibration absorbing suspension unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration absorbing suspension unit having an increased vibration absorbing capacity for a device having a mechanism performing a reciprocating motion in a Stirling cycle refrigerator. <P>SOLUTION: This vibration absorbing suspension unit comprises a plurality of shafts 14 having male screws 15a formed at the bottom ends thereof, base bottom members 10 having female screws 11 threaded with the male screws of the shafts formed at the upper surface thereof, an intermediate member 21 fixed to the outer peripheral surface of a suspended body 1 and having through holes 21c for passing the shafts therethrough, a first elastic member 20a through which the shafts are passed and fitted to the intermediate member on the lower side of the through holes, a second elastic member 20b through which the shafts are passed and fitted to the intermediate member on the upper side of the through holes, a first support member 19a fixed to the shafts supporting the end part of the first elastic member, and a second support member 19b fixed to the shafts supporting the second elastic member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration-absorbing suspension unit, and more particularly to a vibration-absorbing suspension unit suitable for suspension of a device having a mechanism that reciprocates inside, for example, a Stirling cycle refrigerator.

In recent years, refrigerators using a Stirling cycle, that is, Stirling cycle refrigerators have been put into practical use.
Since the principle and structure of the Stirling cycle refrigerator are already known, the description thereof is omitted here. However, for example, an example of a drive mechanism of the Stirling cycle refrigerator is disclosed in Japanese Patent Laid-Open No. 2000-337725. ing. Further, vibration absorbing units suitable for such devices are disclosed in, for example, Patent Documents 1 to 4 listed below.

Here, FIG. 7 shows an example of a conventional suspension unit.
In this suspension unit, the Stirling cycle refrigerator 101 is suspended by a plurality of springs 103 inside the housing 102.
More specifically, a plurality of, for example, three or four sets of mounting brackets 104 are provided at equal intervals on the outer periphery of the substantially cylindrical Stirling cycle refrigerator 101, and obliquely upward and diagonally downward from the respective brackets 104. The springs 103 are attached, and the other ends of the springs are fixed to the inner surface of the housing 102.

  And the heat absorption part 105 which exists in the upper end of this refrigerator 101 is connected with the to-be-cooled part 107 via the heat pipe 106, and is comprised so that the to-be-cooled part 107 may be cooled. At this time, since the heat absorption part 105 and the heat pipe 106 are in direct contact with each other via grease or the like, the heat conduction efficiency is good, but vibration from the Stirling cycle refrigerator 101 causes the heat pipe 106 and the part to be cooled. There is a problem of being easily transmitted to 107.

JP-A-5-26294 JP-A-8-233028 US Pat. No. 5,895,033 JP 2003-214487 A

  Refrigerators using the Stirling cycle as described above have the ability to rapidly freeze while being small in size, such as bio, biochemistry, genetic engineering, medical care, horticultural chemistry, physical property physics, improved sensitivity of photodetectors, etc. Expected to be used in a wide range of fields. In other words, it is suitable for filling a small volume sample in a dedicated container, cooling, reacting, storing, culturing, freezing, observing under a microscope, etc., and convenient for handling in laboratories and laboratories. Expected to be used as a desktop small cooling unit.

  However, the conventional suspension-type vibration absorption capability as described above cannot sufficiently absorb the vibration of a device having a mechanism that reciprocates inside, such as a Stirling cycle refrigerator, and is used for the above-described purpose. The equipment was insufficient. That is, for example, if a sample that has been subjected to stacking and sedimentation by centrifugation is cooled for research and inspection purposes, the structure of the stacking sediment may be disturbed by the vibration of the refrigerator, and the research and inspection purposes may not be achieved. Arise.

  Therefore, the present invention has an object to propose a vibration absorption suspension unit with improved vibration absorption capability for a device having a mechanism that reciprocates inside, such as a Stirling cycle refrigerator, and in particular, The vibration direction of such a device is restricted to one direction (for example, the movement direction of the internal reciprocating mechanism), and the vibration caused by the internal motion is absorbed while the device is suspended in a predetermined position. It is another object of the present invention to propose a vibration absorbing suspension unit that can be adjusted and the suspension position can be easily adjusted.

The above-described problem has been solved by the vibration-absorbing suspension unit according to the present invention.
That is, a plurality of shafts each having a male screw formed at the lower end, a base member having a female screw to be engaged with the male screw of each shaft formed on the upper surface, and the shaft fixed to the outer peripheral surface of the suspended body An intermediate member having a through-hole penetrating through, an elastic member through which the shaft passes, a first elastic member mounted on the lower side of the through-hole of the intermediate member, and the shaft penetrates A second elastic member mounted on the upper side of the through hole of the intermediate member; and an end of the first elastic member at an end of the first elastic member opposite to the through hole. A first support member fixed to the shaft that supports the second portion, and a second support member fixed to the shaft that supports the second elastic member at an end of the second elastic member opposite to the through hole. And a vibration-absorbing suspension unit with a support member It has been.

Here, the intermediate member includes a plurality of U-shaped members formed in a U-shape by bending right and left ends of an elongated flat plate, or a substantially cylindrical central portion surrounding the suspended body, and the substantially cylindrical shape. This can be realized by forming a single bobbin-like member composed of a lower flange and an upper flange provided at the lower end and the upper end of the central portion.
In the former case, through holes for allowing the shaft to penetrate are formed in the upper side and the lower side forming the U-shape. In the latter case, a through-hole for allowing the shaft to pass through is formed in the upper flange and the lower flange.

Further, a mounting portion for rotating the shaft around the axis can be provided at the upper end of the shaft, and the mounting portion can be realized by, for example, a groove, a cross hole, a hexagonal hole, a notch or the like.
When the mounting portion is a groove, a cross hole, or a hexagonal hole provided at the upper end of the shaft, the shaft can be rotated around its axis by using a flathead screwdriver, a positive screwdriver, and a hexagon wrench, respectively. When the attachment portion is a notch provided on the side surface of the shaft, it can be turned with a spanner or the like. In addition, it can also be realized with the same effect.

  Further, the first and second elastic members can be realized by using, for example, a helical spring, a leaf spring, rubber or the like. For these elastic members, it is also possible to use a material with a large mechanical loss that attenuates vibration. It is also possible to mount a damping member having a large mechanical loss in series or in parallel with these elastic members.

  The first and second support members can be realized by an E-shaped retaining ring fixed to the shaft. In addition, a second male screw may be provided on the shaft, and both or one of the first and second support members may be realized by a nut that is screwed with the second male screw so that the position can be adjusted. . In this case, it is preferable that the nut is a double nut so that it can be firmly fixed in place.

  According to the above-described vibration-absorbing suspension unit according to the present invention, a suspended body such as a Stirling cycle refrigerator, for example, includes a base member, a plurality of shafts, first and second elastic members attached to the respective shafts, and It is held in a suspended state via the intermediate member. Each shaft is screwed to the base member and is erected. The intermediate member is elastically supported by the first and second elastic members along the shaft, and the suspended body is fixed to the intermediate member. Therefore, the vibration of the suspended body is restricted only in the standing direction of the shaft. Further, by appropriately setting the elastic constants and the like of the first and second elastic members that elastically support the intermediate member, the characteristic of the vibration system composed of the first and second elastic members and the suspended body is determined. The frequency can be removed from the frequency of the vibration source of the suspended body, resonance can be avoided, and vibration can be absorbed efficiently. And the suspension position of a to-be-suspended body can be easily adjusted to an appropriate position by changing the screwing amount with respect to the base member of a shaft.

  Hereinafter, a preferred embodiment of the vibration absorbing suspension unit according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a conceptual elevational sectional view of a refrigerator using a Stirling cycle equipped with a vibration absorbing suspension unit according to the present invention.
The Stirling cycle refrigerator 1 used in this refrigerator includes a wiring group 2 for connecting to an external power supply unit / control unit on the lower surface, and a heat radiating unit 4 at the lower part of the upper cylindrical projection 3. The heat absorption part 5 is each provided in the upper part. Then, the heat radiated by the heat radiating unit 4 is radiated to the outside through the radiating fins 6. The heat absorbing unit 5 is coupled to the cooling block 8 through the heat transfer fluid chamber 7 and cools the sample mounted on the cooling block 8. Inside the Stirling cycle refrigerator 1, there is a mechanism such as a piston (not shown) that reciprocates in the vertical direction, and the Stirling cycle refrigerator 1 mainly vibrates in the vertical direction.

  The base member 10 that supports the Stirling cycle refrigerator 1 from below is provided with a plurality of female screws 11 in the vertical direction. In this embodiment, three penetrating female screws 11 are provided at equal intervals on the circumference along the projection of the outer periphery of the Stirling cycle refrigerator 1 that is a suspended body to the base member 10. The base member 10 is horizontally fixed to the housing 12 with fixing screws 13 using the lower portions of these female screws 11.

A part of the wiring group 2 provided on the lower surface of the Stirling cycle refrigerator 1 is accommodated in a recess provided in the center of the base member 10.
It is also possible to form the base member 10 in an annular shape so that a part of the wiring group 2 is accommodated in the central space.

  A shaft 14 is screwed into the upper portion of the female screw 11 of the base member 10. The female screw 11 is formed in the base member 10 so that the shaft 14 screwed into each is parallel to the vertical direction, that is, the movement direction of a reciprocating mechanism such as a piston (not shown) of the Stirling cycle refrigerator 1. Has been.

  As shown in FIG. 2 or 3, each of the shafts 14 is formed with a first male screw 15a screwed into the female screw 11 of the base member 10 at the lower end, which is one end, A groove as the attachment portion 16 is formed on the upper end surface which is an end portion. Then, each shaft 14 can be screwed into the female screw 11 of the base member 10 by inserting a minus driver (not shown) into the mounting portion 16 and turning it. The shaft 14 can be firmly fixed to the base member 10 by tightening the fixing nut 17 screwed into the first male screw 15 a in the direction of the base member 10.

  The shaft mounting portion 16 is not limited to the groove described above, but can be realized by a cross hole, a hexagonal hole, or a notch provided on the side surface of the shaft 14. In such a case, the shaft 14 can be rotated around the axis by using a Phillips screwdriver, a hex wrench, a spanner or the like instead of the flat screw driver.

  In the embodiment of the shaft 14 shown in FIG. 2, the first retaining ring groove 18 a and the second retaining ring groove 18 b are formed in each shaft 14. Then, an E-shaped retaining ring as the first support member 19a is mounted in the first retaining ring groove 18a, and a compression spring as the first elastic member 20a is placed thereon. That is, the E-shaped retaining ring that is the first support member 19a supports the compression spring that is the first elastic member 20a from below. The second retaining ring groove 18b is provided with an E-shaped retaining ring which is a second support member 19b.

  On the other hand, in another embodiment of the shaft 14 shown in FIG. 3, a first retaining ring groove 18 a and a second male screw 15 b are formed on each shaft 14. Then, an E-shaped retaining ring as the first support member 19a is mounted in the first retaining ring groove 18a as described above, and a compression spring as the first elastic member 20a is placed thereon. The second screw 15b is provided with a double nut as the second support member 19b.

FIG. 4 is a perspective view showing an embodiment of the intermediate member 21.
The intermediate member 21 is a U-shaped member formed by bending the vicinity of both ends of an elongated flat plate at a right angle. Then, first and second through holes 21c and 21d for penetrating the shaft 14 are formed in the lower portion 21a corresponding to the lower side of the U-shape and the upper portion 21b corresponding to the upper side of the U-shape, respectively. Yes. Further, a through hole 21f for fixing the Stirling cycle refrigerator 1 as a suspended body with a screw is provided in the central portion 21e corresponding to the vertical side of the U-shape.

On the other hand, FIG. 5 is a perspective view showing another embodiment of the intermediate member 21.
The intermediate member 21 includes a substantially cylindrical central portion 21e that surrounds the outer periphery of the Stirling cycle refrigerator 1 that is a suspended body, and a lower end and an upper end of the substantially cylindrical central portion 21e that are perpendicular to the axis of the cylinder. Are bobbin-like members formed by a lower portion 21a and an upper portion 21b, which are flanges provided respectively. In the lower portion 21a and the upper portion 21b, three first and second through holes 21c and 21d for penetrating the shaft 14 are formed at equal intervals of 120 °.

  And the bearing bush 22 is inserted in the upper and lower through holes 21c and 21d of the intermediate member 21 shown in FIG. 4 or 5, respectively, and the shaft 14 penetrates the bearing bush 22 as shown in FIG. ing. The bearing bush 22 is formed of a self-lubricating resin and has a function of reducing the frictional resistance with the shaft 14.

  In the embodiment of the shaft 14 shown in FIG. 2, the second elastic member 20b is provided between the upper portion of the lower portion 21a of the intermediate member 21 and the E-shaped retaining ring as the second support member 19b. A compression spring is attached. As a result, the lower portion 21a of the intermediate member 21 is elastically pressed upward by the first elastic member 20a supported by the E-shaped retaining ring which is the first support member 19a from below, and from above. Is elastically pressed downward by a second elastic member 20b supported by an E-shaped retaining ring which is a second support member 19b.

  Therefore, in the stationary state, the position of the intermediate member 21 is determined by the elastic balance between the first and second elastic members 20a and 20b. In this equilibrium position, a flathead screwdriver is inserted into the groove on the end surface, which is the mounting portion 16 of the shaft 14, and the shaft 14 is turned around its axis to adjust the screwing amount of the base member 10 into the female screw 11. Can be adjusted.

  On the other hand, in the embodiment of the shaft 14 shown in FIG. 3, the second elastic member 20b is provided between the upper portion of the lower portion 21a of the intermediate member 21 and the double nut as the second support member 19b. A compression spring is attached. As a result, the lower portion 21a of the intermediate member 21 is elastically pressed upward from below by the first elastic member 20a supported by the E-shaped retaining ring which is the first support member 19a from below. From above, it is elastically pressed downward by a second elastic member 20b supported by a double nut which is a second support member 19b.

  Therefore, in the stationary state, the position of the intermediate member 21 is determined by the elastic balance between the first and second elastic members 20a and 20b. In this equilibrium position, a flathead screwdriver is inserted into the groove on the end surface, which is the mounting portion 16 of the shaft 14, and the shaft 14 is turned around its axis to adjust the screwing amount of the base member 10 into the female screw 11. Can be adjusted. In this embodiment, since the second support member 19b is formed of a double nut, the elastic constants of the first and second elastic members 20a and 20b are changed by moving the position of the double nut. Therefore, fine adjustment corresponding to variations in individual components can be performed. After adjusting the elastic constant and the equilibrium position to desired ones, the double nut as the second support member 19b and the shaft fixing nut 13 are tightened to fix the position.

  When the intermediate member 21 that is the U-shaped member shown in FIG. 4 is used, the Stirling cycle that is a suspended body is used by using the fixing screw 9 that passes through the through hole 21f of the central portion 21e of the intermediate member 21. A plurality of, in this embodiment, three intermediate members 21 are fixed to the outer peripheral side surface of the refrigerator 1 at equal intervals of 120 °.

  On the other hand, when the intermediate member 21 that is the bobbin-shaped member shown in FIG. 5 is used, the substantially cylindrical central portion 21e of the intermediate member 21 and the outer peripheral side surface of the Stirling cycle refrigerator 1 that is the suspended body are Spot welded and fixed. In FIG. 6, the example of the spot welding location is indicated by X. Thus, by effecting spot welding of the intermediate member 21 in a state of covering the Stirling cycle refrigerator 1, a soundproofing effect and a reinforcing effect can be obtained.

  As shown in FIG. 1 or FIG. 6, the vibration absorbing suspension unit according to the present invention configured as described above is provided with the Stirling cycle refrigerator 1 mounted on the base member 10, the plurality of shafts 14, and the respective shafts 14. The first and second elastic members 20a and 20b and the intermediate member 21 are held in a suspended state.

  Each shaft 14 is disposed so as to be substantially parallel to the vibration direction of a vibration source such as a reciprocating mechanism of the Stirling cycle refrigerator 1, and the intermediate member 21 includes first and second members along the shaft 14. Since the Stirling cycle refrigerator 1 which is elastically supported by the elastic members 20a and 20b and is a suspended body is held by the intermediate member 21, the vibration of the Stirling cycle refrigerator 1 is only in the direction of the shaft 14. Regulated by

  Furthermore, by appropriately setting the elastic constants and the like of the first and second elastic members 20a and 20b, the natural vibration of the vibration system including the first and second elastic members 20a and 20b and the Stirling cycle refrigerator 1 is achieved. The number can be removed from the frequency of the vibration source inside the Stirling cycle refrigerator 1. That is, in the case of the embodiment of the shaft 14 shown in FIG. 2, the elastic modulus and density of the material of the first and second elastic members 20a and 20b, and the first and second retaining ring grooves 18a and 18b. This can be achieved by setting the position of to an appropriate value in advance. Further, in the case of the embodiment of the shaft 14 shown in FIG. 3, in addition to the above, the position of the second support member 19b, which is a double nut screwed to the second male screw 15b formed on the shaft 14, is provided. By adjusting this, the elastic constants of the first and second elastic members 20a and 20b can be finely adjusted.

  Thus, when the elastic modulus and the like are appropriately set, resonance is avoided, and vibration from the vibration source inside the Stirling cycle refrigerator 1 is almost completely absorbed. The suspension position of the Stirling cycle refrigerator 1 is determined by inserting a flathead screwdriver into a groove on the end surface, which is the mounting portion 16 of the shaft 14, turning the shaft 14 around its axis, and screwing the base member 10 to the female screw 11. It can be easily adjusted by adjusting the amount.

  Although the embodiments of the vibration absorbing suspension unit according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and the technical aspects of the present invention described in the claims are not limited. It goes without saying that various modifications and changes are possible within the scope of the idea.

It is a notional elevation sectional view of a refrigerator using a Stirling cycle provided with a vibration absorption suspension unit concerning the present invention. FIG. 3 is an exploded elevation view showing an embodiment of a main part of a vibration absorbing suspension unit according to the present invention. It is the exploded elevation which showed other embodiments of the principal part of the vibration absorption suspension unit concerning the present invention. It is the perspective view which showed one Embodiment of the intermediate member used in this invention. It is the perspective view which showed other embodiment of the intermediate member used in this invention. It is the conceptual diagram which showed the example of the spot welding location of the intermediate member and Stirling cycle refrigerator shown in FIG. It is the notional elevation sectional drawing which showed an example of the suspension unit of the Stirling cycle refrigerator by a prior art.

Explanation of symbols

1 Stirling cycle refrigerator (suspended body)
DESCRIPTION OF SYMBOLS 2 Wiring group 3 Cylindrical protrusion 4 Heat radiation part 5 Heat absorption part 6 Radiation fin 7 Heat conduction fluid chamber 8 Cooling block 9 Fixing screw 10 Base member 11 Female screw 12 Housing | casing 13 Fixing screw 14 Shaft 15a 1st male screw 15b 1st 2 male screws 16 Mounting part (groove)
17 fixing nut 18a first retaining ring groove 18b second retaining ring groove 19a first support member 19b second support member 20a first elastic member 20b second elastic member 21 intermediate member 21a upper part 21b lower part 21c 1st through-hole 21d 2nd through-hole 21e Through-hole 22 Bush

Claims (7)

  A plurality of shafts each having a male screw formed at the lower end, a base member having a female screw threadedly engaged with the male screw of each shaft formed on the upper surface, and the shaft passing through the shaft fixed to the outer peripheral surface of the suspended body An intermediate member having a through hole, an elastic member through which the shaft passes, a first elastic member mounted below the through hole of the intermediate member, and an elastic member through which the shaft passes A second elastic member mounted on the upper side of the through hole of the intermediate member and an end of the first elastic member opposite to the through hole of the first elastic member. A first support member fixed to the shaft to be supported; and a second support member fixed to the shaft that supports the second elastic member at an end of the second elastic member opposite to the through hole. And a vibration-absorbing suspension unit. .   The intermediate member is formed into a U-shape by bending the vicinity of both ends of an elongated flat plate at a right angle, and the through-hole through which the shaft passes is formed in a lower portion corresponding to the lower side of the U-shape. A second through hole through which the shaft passes is formed in a corresponding upper portion, and a central portion corresponding to a vertical side of the U-shape is a U-shaped member fixed to the suspended body, The vibration-absorbing suspension unit according to claim 1.   The intermediate member is formed in a bobbin shape including a substantially cylindrical central portion surrounding the outer periphery of the suspended body, a lower flange and an upper flange provided at a lower end and an upper end of the substantially cylindrical central portion, The through hole through which the shaft penetrates is formed in the lower portion which is a flange, the second through hole through which the shaft penetrates is formed in the upper portion which is the upper flange, and the substantially cylindrical central portion is formed in the covered portion. The vibration-absorbing suspension unit according to claim 1, wherein the vibration-absorbing suspension unit is a bobbin-like member fixed to the suspension body.   The vibration-absorbing suspension unit according to any one of claims 1 to 3, wherein the shaft has a mounting portion for rotating around the shaft.   The first and second elastic members are made of a material having a large mechanical loss that attenuates vibration, and / or a damping member having a large mechanical loss is mounted in series or in parallel with these elastic members. The vibration-absorbing suspension unit according to claim 1, wherein:   6. The shaft according to claim 1, wherein the shaft includes a second male screw, and both or one or both of the first and second support members are nuts that are screwed into the second male screw. The vibration absorbing suspension unit according to any one of the above.   The vibration-absorbing suspension unit according to any one of claims 1 to 6, wherein the suspended body is a refrigerator using a Stirling cycle.

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