JP2588070Y2 - Magnet coupling device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A magnetic coupling device according to the present invention is used for rotating a stirring shaft provided in a culture tank by a driving device attached to the culture apparatus and provided outside the culture tank. I do.

[0002]

2. Description of the Related Art In order to culture various microorganisms and plant cells, a culture device called a bioreactor or a jar fermenter is used. This culture apparatus has a bottomed cylindrical culture tank. When performing the culture operation, plant cells and the like are put into the culture tank together with the culture solution, and a predetermined culture operation is performed while stirring the culture solution.

[0003] The stirring operation of the culture solution is performed by rotating a stirring shaft provided at the center of the culture tank and a stirring blade fixed to the stirring shaft. In this case, the rotation of the stirring shaft is performed by a motor provided outside the culture tank through a magnet coupling device.

FIG. 5 shows an example of a magnetic coupling device conventionally incorporated in a culture device.
At the center of the bottom plate 1 of the culture tank, the lower end of a cylindrical inner cylinder 2 whose upper end is closed and whose lower end is open is penetrated in a liquid-tight manner,
The inner cylinder 2 extends vertically upward from the upper surface of the bottom plate 1. At the center of the upper end surface of the inner cylinder 2, a support column 3 is formed vertically upward. A sleeve 11a made of stainless steel is externally fitted and fixed to the supporting column portion 3. The sleeve 11 a is formed by forming an outward flange-shaped flange 14 at the lower end of a cylindrical portion 13 fitted externally to the support column 3, and is formed between the flange 14 and the upper end surface of the inner cylinder 2. The pin 12 provided therebetween prevents rotation of the inner cylinder 2.

A drive shaft 4 is inserted into the inner cylinder 2 from the lower end opening of the inner cylinder 2. A drive-side permanent magnet 5 is supported and fixed to an inner peripheral portion of the inner cylinder 2 on the upper outer peripheral surface of the drive shaft 4. On the outer peripheral surface of the drive-side permanent magnet 5, N poles and S poles are alternately arranged in the circumferential direction.

On the other hand, an outer cylinder 6 is rotatably supported around the inner cylinder 2 by a pair of upper and lower sliding bearings 7a and 7b. Each of the sliding bearings 7a and 7b is formed of a slippery material such as polytetrafluoroethylene, nylon, or the like, in a shape as shown in FIGS. 6 to 7, and has a thrust load and a radial load applied to the outer cylinder 6. To support. That is, each of the sliding bearings 7a and 7b is formed by forming an outward flange-shaped flange 9 at the lower end edge of the cylindrical portion 8, and a plurality of concave grooves 10 on the inner peripheral surface of the cylindrical portion 8 and the lower surface of the flange 9. , 10 are formed. Then, the cylindrical portion 8 of each slide bearing 7a, 7b and each sleeve 11
The radial sliding bearing is constituted by the cylindrical portions 13 and 13 of the sleeves 11a and 11b.
A thrust slide bearing is formed by the bearings 4 and 14, and the radial load and the thrust load are supported at two upper and lower locations, respectively.

The inner peripheral surface of the cylindrical portion 8 of the upper sliding bearing 7a of the pair of sliding bearings 7a and 7b
The sleeve 11a is in sliding contact with the outer peripheral surface of the cylindrical portion 13, and the lower surface of the flange 9 is in sliding contact with the upper surface of the flange 14 of the sleeve 11a. The inner peripheral surface of the cylindrical portion 8 of the lower slide bearing 7b slides on the outer peripheral surface of the cylindrical portion 13 of another sleeve 11b which is non-rotatably fitted on the outer peripheral surface of the lower end portion of the inner cylinder 2 so as not to rotate. The lower surface of the flange 9 comes into sliding contact with the upper surface of the flange 14 of the sleeve 11b.

A portion facing the outer peripheral surface of the drive-side permanent magnet 5 at a vertical intermediate portion of the outer cylinder 6 is a thin portion 1.
5 is assumed. The driven permanent magnet 16 is fixed to the outer peripheral surface of the thin portion 15, and the inner peripheral surface of the driven permanent magnet 16 faces the outer peripheral surface of the driving permanent magnet 5. An N-pole and an S-pole are alternately arranged on the inner peripheral surface of the driven-side permanent magnet 16 at the same angular pitch as the S-pole and the N-pole on the inner peripheral surface of the driving-side permanent magnet 5 over the circumferential direction. Has been placed. The outside of the driven permanent magnet 16 is covered with a cover 17.

A cylindrical gap 18 is interposed between the inner peripheral surface of the outer cylinder 6 and the outer peripheral surface of the inner cylinder 2 to prevent the two peripheral surfaces from coming into contact with each other and to prevent each of the sliding surfaces from sliding. Bearing 7
This gap 1 is formed through the concave grooves 10 and 10 formed in the a and 7b.
The fluid present in the culture tank is allowed to flow through the inside of the tank 8.

When using the magnet coupling constructed as described above, the drive-side permanent magnet 5 is driven to rotate via the drive shaft 4 by an electric motor (not shown). As a result, the outer cylinder 6 to which the driven permanent magnet 16 is fixed rotates around the inner cylinder 2.

A pair of upper and lower sliding bearings 7a and 7b rotate together with the outer cylinder 6 as the outer cylinder 6 rotates. As a result, based on the centrifugal force acting on the flanges 9 and 9 at the lower ends of the sliding bearings 7a and 7b, the fluid existing inside the concave grooves 10 and 10 formed on the lower surface of the flanges 9 and 9 is reduced in diameter. A pumping action flows from the inside to the outside in the direction. Based on this pumping action, the fluid sucked from the upper end side opening of the outer cylinder 6 is sent into the gap 18, and the fluid in the gap 18 is discharged from the lower side of the outer cylinder 6.

When using the culturing apparatus, high-temperature steam or hot water such as hot water is fed into the culturing tank prior to the start of the culturing operation, and each part of the culturing tank is heat-sterilized. At this time, by driving the drive shaft 4 to rotate, a pump action is generated by the concave grooves 10 and 10 formed in the respective slide bearings 7a and 7b, and a high-temperature fluid for sterilization is caused to flow through the gap 18. .

[0013]

[Problems to be Solved by the Invention] The magnet coupling device of the present invention omits the lower thrust slide bearing,
By supporting the thrust load only on the upper thrust slide bearing where crystals precipitated from the flowing liquid such as culture medium are hard to enter, remarkable wear of the bearing part due to the crystals is suppressed, and maintenance management of the magnet coupling device is simplified. It is intended.

That is, some culture solutions stored in the culture tank precipitate hard crystals with a change in temperature or concentration. When such crystals are formed in the magnet coupling portion and enter the sliding surface between the sliding bearings 7a and 7b and the mating member, the sliding bearings 7a and 7b and the mating member are worn out at an early stage. In particular, in the conventional structure shown in FIG. 5, crystals precipitated in the gap 18 enter the thrust slide bearing portion formed by the flange 9 of the lower slide bearing 7b and the flange 14 of the sleeve 11b. Moreover, since a large thrust load is applied, wear becomes remarkable.

As a result, the frequency of parts replacement of the bearing portion increases, and the labor required for maintenance and management of the magnet coupling device increases. The magnetic coupling device of the present invention has been devised in view of the above-described circumstances.

[0016]

The magnetic coupling device according to the present invention, like the conventional magnetic coupling device described above, penetrates the bottom plate of the container for storing the liquid to be stirred in a liquid-tight manner, and A cylindrical inner cylinder extending vertically upward from the upper surface and having a closed upper end and an open lower end; a support column extending vertically upward from the center of the upper end surface of the inner cylinder; and an inner side of the inner cylinder. A drive shaft inserted from below, a drive-side permanent magnet fixed to the outer peripheral surface of the drive shaft at an inner position of the inner cylinder, and an outer cylinder rotatably supported around the inner cylinder. A driven side permanent magnet fixed to the outer cylinder and having an inner peripheral surface facing the outer peripheral surface of the driving permanent magnet, and a cylinder provided between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder. -Shaped gap and the inner peripheral surface at the upper end of the outer cylinder, and the inner peripheral surface is An upper radial sliding bearing slidably in contact with the outer peripheral surface of the holding cylinder portion, the upper radial sliding bearing allowing the liquid to flow in the vertical direction; and a lower inner peripheral surface of the outer cylinder, which is internally fitted to the inner cylinder. A lower radial sliding bearing that allows the liquid to flow in the vertical direction, which is slidably in contact with the outer peripheral surface of the outer cylinder, between the upper end of the outer cylinder and the peripheral portion of the support cylinder at the upper end of the inner cylinder. And a single thrust slide bearing that allows the liquid to flow in the radial direction.

Further, the thrust slide bearing has a thrust receiving plate made of cemented carbide. Further, between the lower surface of the lower radial sliding bearing and a mating member facing the lower surface,
The gap is a space through which the liquid can flow.

[0018]

With the magnet coupling device of the present invention configured as described above, the operation itself when the outer cylinder is rotationally driven via the drive-side permanent magnet and the driven-side permanent magnet when the drive shaft is rotationally driven is as described above. This is the same as the conventional magnet coupling device described above.

In particular, in the case of the magnetic coupling device of the present invention, the thrust load is supported by a thrust sliding bearing provided between the upper end of the outer cylinder and the peripheral portion of the support cylinder at the upper end of the inner cylinder. . A thrust slide bearing is not provided between the lower end of the outer cylinder and the lower end of the inner cylinder, and since liquid can flow freely between these bearings, the gap between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder is reduced. The presence of crystals precipitated from the flowing liquid prevents the bearing portion from being significantly worn as described above. Along with omitting the lower thrust slide bearing,
The thrust load is supported by a single upper thrust slide bearing. However, since this thrust slide bearing has a thrust bearing plate made of carbide steel, there is no problem in wear resistance.

As a result, remarkable wear of the bearing portion caused by the presence of the crystal is prevented, so that the number of times of replacement of the parts is reduced, and the maintenance and management of the magnet coupling device can be simplified.

[0021]

1 to 4 show an embodiment of the present invention. As in the above-described conventional apparatus, the lower end of a cylindrical inner cylinder 2 whose upper end is closed and whose lower end is open is passed through the lower end of the bottom plate 1 of the culture tank in a liquid-tight manner. Extends vertically upward from the upper surface of the. At the center of the upper end surface of the inner cylinder 2, a support column 3 is formed vertically upward.

That is, a support ring 27 is fixed to the periphery of the circular hole 23 formed in the center of the bottom plate 1 in a liquid-tight manner by welding, and the inner cylinder 2 is fixed inside the support ring 27.
Is inserted from below, and the upper surface of the mounting flange 24 formed on the outer peripheral edge of the lower end portion of the inner cylinder 2 abuts against the lower surface of the support ring 27. Furthermore, the upper surface of the mounting flange 26 formed on the outer peripheral edge of the upper end of the connection tube 25 is abutted against the lower surface of the mounting flange 24. These two mounting flanges 24, 26 are connected to the support ring 27 by bolts 28, 28.

A drive shaft 4 is inserted into the inner cylinder 2 through an opening at the lower end of the inner cylinder 2, and a drive-side permanent magnet is inserted into the inner peripheral portion of the inner cylinder 2 on the upper outer peripheral surface of the drive shaft 4. 5 is supported and fixed.

Further, a cylindrical sleeve 19 is externally fitted and fixed to the outer peripheral surface of the support column 3 with stainless steel, and a portion of the upper surface of the inner cylinder 2 surrounding the support column 3 is abrasion resistant. A thrust receiving plate 20 made of a carbide steel having excellent properties and having a circular shape is placed thereon. The sleeve 19 has a screw 21,
21 and the thrust receiving plate 20 is
2 and 22 support the inner cylinder 2 so that they cannot rotate.

On the other hand, an outer cylinder 6 is rotatably supported around the inner cylinder 2 by a pair of upper and lower sliding bearings 7a and 7b. The pair of sliding bearings 7a and 7b are made of a slippery material into a shape as shown in FIGS. 6 to 7 to constitute upper and lower radial sliding bearings.
Of the sliding bearings 7a and 7b, the inner peripheral surface of the cylindrical portion 8 of the upper sliding bearing 7a is in sliding contact with the outer peripheral surface of the sleeve 19, and the lower surface of the flange portion 9 is in sliding contact with the upper surface of the thrust receiving plate 20.
The inner peripheral surface of the cylindrical portion 8 of the lower slide bearing 7b slides on the outer peripheral surface of the cylindrical portion 13 of another sleeve 11a which is non-rotatably fitted on the outer peripheral surface of the lower end of the inner cylinder 2 and is non-rotatably fitted. In contact.

A portion facing the outer peripheral surface of the drive-side permanent magnet 5 at an intermediate portion in the vertical direction of the outer cylinder 6 is a thin portion 15, and a driven-side permanent magnet 16 is fixed to the outer peripheral surface of the thin portion 15. ing. The inner peripheral surface of the driven permanent magnet 16 faces the outer peripheral surface of the driving permanent magnet 5, and the outer surface of the driven permanent magnet 16 is covered by a cover 17.

A cylindrical gap 18 is interposed between the inner peripheral surface of the outer cylinder 6 and the outer peripheral surface of the inner cylinder 2, and these two peripheral surfaces come into sliding contact with the rotation of the outer cylinder 6. I try not to do anything. The fluid existing in the culture tank is allowed to flow through the gaps 18 through the concave grooves 10 and 10 formed in the sliding bearings 7a and 7b. In addition, this groove 1
0 and 10 are cylindrical portions 8 constituting the respective sliding bearings 7a and 7b.
Can be formed on the inner peripheral surface of the cylindrical portion 8 and the lower surface of the flange portion 9, or on both the inner and outer peripheral surfaces and on both the upper and lower surfaces. Also, the grooves 10 and 10 formed on the peripheral surface can be inclined with respect to the axial direction, or the grooves 10 and 10 formed with the flange 9 can be inclined with respect to the diametric direction.

Further, in the illustrated embodiment, locking holes 29, 29 are provided at a plurality of positions in the circumferential direction of the cylindrical portion 8 constituting the pair of sliding bearings 7a, 7b. It is formed so as to penetrate both peripheral surfaces. On the other hand, the outer cylinder 6
At the upper and lower ends of the hole, the portions matching the locking holes 29, 29 are provided with insertion holes 30, 3, smaller in diameter than the locking holes 29, 29.
0 is formed. Then, in each of the insertion holes 30, 30, FIG.
The hollow locking pins 31, 31 as shown in FIG.
The outer pins 0, 30 are press-fitted from the side of the outer end opening while elastically reducing the outer diameter. As shown in detail in FIGS.
1 is inserted into each of the locking holes 30, 30.

Further, in the present invention, the flange 9 of the lower slide bearing 7b is lifted from the upper surface of the support ring 27 so that the lower surface of the flange 9 does not slide on the mating member.
Along with this, the thrust load based on the weight of the outer cylinder 6 and the members attached to the outer cylinder 6 is reduced by the thrust slide bearing constituted by the flange 9 of the upper slide bearing 7a and the thrust receiving plate 20. It will be supported. However, it is difficult for crystals that cause remarkable wear to enter into the sliding bearing 7a, and since the thrust receiving plate 20 is made of carbide steel having excellent wear resistance, the wear of the sliding bearing 7a is reduced. Will be minor.

In the illustrated embodiment, the lower end surface of the inner cylinder 2 is also provided with a concave groove 1 for inducing a pump action described later.
0 and 10 are formed. Further, stirring blades 32, 32 for stirring the culture solution stored in the culture tank are provided on the outer peripheral surface of the intermediate portion of the cover 17. A mounting flange 34 fixed to the lower end of the stirring shaft 33 is fixed to the upper end surface of the inner cylinder 2 by bolts 35, 35. This stirring shaft 33 is also provided with a separate stirring blade. Further, in the upper end portion of the inner cylinder 2, through holes 36, 36 for communicating the inside and the outside of the inner cylinder 2 are formed in a lower portion of the mounting flange 34.

With the magnetic coupling device of the present invention configured as described above, when the drive shaft 4 is rotationally driven, the outer cylinder 6 is connected via the drive-side permanent magnet 5 and the driven-side permanent magnet 16.
Is rotated, and the operation itself of stirring the culture solution stored in the culture tank by the stirring blades 32, 32 is the same as that of the above-described conventional magnetic coupling device.

In particular, in the case of the magnetic coupling device of the present invention, a thrust slide bearing is constituted by the flange 9 of the upper slide bearing 7a and the thrust receiving plate 20 made of cemented carbide, and the lower slide bearing is formed. The flange 9b of 7b is floated from the support ring 27 which is the opposing member, and these members do not constitute a thrust slide bearing. As described above, since no thrust slide bearing is provided on the lower portion of the inner and outer cylinders 2 and 6,
Like the conventional device, the crystals precipitated from the culture solution flowing through the gap 18 enter the thrust sliding bearing existing in the relevant portion, so that a large thrust load is not applied, and the bearing portion is caused by the presence of the crystal. Wear significantly,
An increase in the number of parts replacement is prevented.

With the omission of the lower thrust slide bearing, the thrust load must be supported by a single thrust slide bearing composed of the flange 9 of the upper slide bearing 7b and the thrust receiving plate 20. However, since the thrust receiving plate 20 is made of cemented carbide, wear of this portion does not significantly proceed.

As described above, in the magnetic coupling device of the present invention, the durability of the bearing portion that rotatably supports the outer cylinder 6 with respect to the inner cylinder 2 is improved, and the number of times of replacing parts is reduced. As a result, the maintenance of the magnet coupling device can be simplified.

Further, in the case of the illustrated embodiment, the outer cylinder 6 is inserted and fixed in locking holes 29 formed at both upper and lower ends of the outer cylinder 6 based on centrifugal force accompanying rotation of the outer cylinder 6. A pumping action that causes the fluid present in the locking pins 31, 31 to flow diametrically outward occurs. This pump action is performed by each locking pin 3
Not only the inner parts 1 and 31 but also the flanges 9 and 9 of each of the slide bearings 7a and 7b and the concave groove 10 formed on the lower end face of the outer cylinder 6;
Also occurs in 10 parts.

The locking pin 3 inserted and fixed in each of the locking pins 31, particularly the locking holes 29 at the lower end of the outer cylinder 6.
Reference numerals 1 and 31 are provided in portions away from the center of rotation,
Moreover, since the distance between the inner end opening and the outer end opening of each locking pin 31, 31 is relatively large, the pumping action is relatively large in combination with the pumping action generated in the concave grooves 10, 10. A relatively large amount of fluid flows from the inner circumference to the outer circumference of the outer cylinder 6.

As a result, a large amount of high-temperature fluid can be circulated in a short time within the cylindrical gap 18 provided between the inner peripheral surface of the outer cylinder 6 and the outer peripheral surface of the inner cylinder 2. Becomes possible,
Sterilization in the gap 18 can be performed efficiently.

[0038]

[Effects of the Invention] The magnetic coupling device of the present invention is constructed and operated as described above. Therefore, the durability of the bearing portion that rotatably supports the outer cylinder with respect to the inner cylinder is improved, and parts are replaced. And the maintenance management of the magnet coupling device can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is an enlarged view of part B of FIG.

FIG. 4 is a perspective view of a locking pin.

FIG. 5 is a longitudinal sectional view showing a conventional structure.

FIG. 6 is a bottom view of the slide bearing.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate 2 Inner cylinder 3 Supporting cylinder part 4 Drive shaft 5 Driving permanent magnet 6 Outer cylinder 7a, 7b Sliding bearing 8 Cylindrical part 9 Flange part 10 Groove 11a, 11b Sleeve 12 Pin 13 Cylindrical part 14 Flange part 15 Thin part 16 Driven side permanent magnet 17 Cover 18 Gap 19 Sleeve 20 Thrust receiving plate 21 Screw 22 Pin 23 Round hole 24 Mounting flange 25 Connection tube 26 Mounting flange 27 Support ring 28 Bolt 29 Lock hole 30 Insert hole 31 Lock pin 32 Stirrer blade 33 Stirring shaft 34 Mounting flange 35 Bolt 36 Through hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical inner cylinder which penetrates a bottom plate of a container for storing a liquid to be stirred in a liquid-tight manner and extends vertically upward from an upper surface of the bottom plate, and has a closed upper end and an open lower end; A support column extending vertically upward from the center of the upper end surface of the inner cylinder, and a drive shaft inserted from below into the inner cylinder,
A drive-side permanent magnet fixed to the outer peripheral surface of the drive shaft at an inner position of the inner cylinder, an outer cylinder rotatably supported around the inner cylinder, and an inner cylinder fixed to the outer cylinder and A driven permanent magnet whose surface faces the outer peripheral surface of the driving permanent magnet,
A cylindrical gap provided between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder, and the inner peripheral surface of the upper end portion of the outer cylinder is fitted inside the outer peripheral surface of the support cylinder portion. An upper radial sliding bearing slidably in contact with the surface and allowing the liquid to flow in the vertical direction; and a lower inner peripheral surface of the outer cylinder, which is internally fitted to the outer peripheral surface of the inner cylinder. A lower radial sliding bearing that allows the liquid to flow in the up-down direction and is provided between an upper end portion of the outer cylinder and an upper end surface of the inner cylinder and a peripheral portion of the support column portion, A single thrust bearing that permits the flow of liquid in the radial direction, the thrust bearing having a thrust bearing plate made of cemented carbide, and a lower surface of the lower radial slide bearing and a mating surface facing the lower surface. A magnetic coupling between the member and the member as a gap through which the liquid can flow. Location.