JPH0628337U - Magnet coupling device - Google Patents

Abstract

(57) [Summary] [Purpose] The gap 18 between the outer peripheral surface of the inner cylinder 2 and the inner peripheral surface of the outer cylinder 6.
To streamline the work of circulating a high-temperature fluid for heat sterilization. [Structure] Between an inner peripheral surface of an inner cylinder 2 which houses a drive permanent magnet 5 and a driven-side permanent magnet 16 fixed between the inner peripheral surface of an outer cylinder 6 and the inner cylinder 2 so as to be rotatable relative to the inner cylinder 2. , There is a gap 18. The slide bearings 7a and 7b for supporting the outer cylinder 6 are attached to the locking pin 3
It is made rotatable with the outer cylinder 6 by 1, 31. The locking pins 31, 31 are hollow, and when the outer cylinder 6 rotates, a high temperature fluid is circulated in the gap 18 by a pumping action based on a centrifugal force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The magnetic coupling device according to the present invention is attached to a culture device, and is used to rotate a stirring shaft provided in the culture tank by a drive device provided outside the culture tank.

[0002]

[Prior art]

 A culture device called a bioreactor or a jar fermenter is used to culture various microorganisms and plant cells. This culture device has a bottomed cylindrical culture tank. When carrying out the culturing work, plant cells and the like are put into the culture tank together with the culture solution, and the predetermined culture work is carried out while stirring the culture solution.

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 stirring shaft is rotated by an electric motor provided outside the culture tank via a magnetic coupling device.

FIG. 5 shows an example of a magnet coupling device conventionally incorporated in a culture device. In the center of the bottom plate 1 of the culture tank, a lower end of a cylindrical inner cylinder 2 having an upper end closed and a lower end opened is penetrated in a liquid-tight manner. It extends vertically upwards. At the center of the upper end surface of the inner cylinder 2, a supporting columnar portion 3 is formed vertically upward. Then, a stainless steel sleeve 11a is externally fitted and fixed to the support columnar portion 3. The sleeve 11a is formed by forming a flange portion 14 having an outward flange shape at a lower end portion of a cylindrical portion 13 which is fitted onto the supporting cylindrical portion 3, and the flange portion 14 and the upper end surface of the inner cylinder 2 are formed. A pin 12 provided between and prevents rotation of the inner cylinder 2.

A drive shaft 4 is inserted inside the inner cylinder 2 through a lower end opening of the inner cylinder 2. The drive-side permanent magnet 5 is supported and fixed to the inner position of the inner cylinder 2 by the outer peripheral surface of the upper portion of the drive shaft 4. On the outer peripheral surface of the drive-side permanent magnet 5, N poles and S poles are arranged alternately 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 slide bearings 7a and 7b. Each of the plain bearings 7a, 7b is made of a slippery material such as polytetrafluoroethylene, nylon, etc., and is formed into a shape as shown in FIGS. 6 to 7. Bear the load. That is, each of the plain bearings 7a, 7b is formed with an outward flange-shaped collar portion 9 on the lower end edge of the cylindrical portion 8, and a plurality of concave portions are formed on the inner peripheral surface of the cylindrical portion 8 and the lower surface of the collar portion 9. Grooves 10 and 10 are formed.

Of the pair of slide bearings 7a, 7b, the inner peripheral surface of the cylindrical portion 8 of the upper slide bearing 7a is in sliding contact with the outer peripheral surface of the cylindrical portion 13 of the sleeve 11a, and the lower surface of the collar portion 9 is It makes sliding contact with the upper surface of the collar portion 14 of the sleeve 11a. Further, the inner peripheral surface of the cylindrical portion 8 of the lower slide bearing 7b is attached to the outer peripheral surface of the cylindrical portion 13 of another sleeve 11b which is non-rotatably fitted and supported on the outer peripheral surface of the lower end portion of the inner cylinder 2. The lower surface of the collar portion 9 is in sliding contact with the upper surface of the collar portion 14 of the sleeve 11b.

Further, a thin wall portion 15 is formed in a portion of the outer cylinder 6 at an intermediate portion in the up-down direction that faces the outer peripheral surface of the drive-side permanent magnet 5. The driven side permanent magnet 16 is fixed to the outer peripheral surface of the thin portion 15, and the inner peripheral surface of the driven side permanent magnet 16 is opposed to the outer peripheral surface of the drive side permanent magnet 5. An N pole and an S pole are arranged on the inner peripheral surface of the driven side permanent magnet 16 in the circumferential direction, and are alternately arranged at the same angular pitch as the S pole and the N pole of the inner peripheral surface of the drive side permanent magnet 5. It is located in. The outside of the driven permanent magnet 16 is covered with a cover 17.

A cylindrical gap 18 is provided between the inner peripheral surface of the outer cylinder 6 and the outer peripheral surface of the inner cylinder 2 to prevent the peripheral surfaces from coming into contact with each other, and to prevent the slippage from occurring. Through the concave grooves 10 and 10 formed in the bearings 7a and 7b, the fluid existing in the culture tank is circulated in the gap 18.

When the magnet coupling configured as described above is used, the drive side permanent magnet 5 is rotationally driven via the drive shaft 4 by an electric motor (not shown). The outer cylinder 6 to which the driven permanent magnet 16 is fixed rotates around the inner cylinder 2.

Along with the rotation of the outer cylinder 6, a pair of upper and lower plain bearings 7 a and 7 b rotate together with the outer cylinder 6. As a result, based on the centrifugal force acting on the flange portions 9, 9 at the lower ends of the plain bearings 7a, 7b, the fluid existing inside the recessed grooves 10, 10 formed on the lower surface of the flange portions 9, 9 is removed. A pumping action that flows from the diametrically inner side to the outer side occurs. On the basis of this pump operation, the fluid sucked from the upper end side opening of the outer cylinder 6 is fed 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, prior to the start of the culturing operation, a high-temperature water vapor or a high-temperature fluid such as boiling water is fed into the culturing tank to heat-sterilize each part of the culturing tank. At this time, the drive shaft 4 is rotationally driven to generate a pumping action by the concave grooves 10 and 10 formed in the slide bearings 7a and 7b, and a high temperature fluid for sterilization is also provided in the gap 18. Distribute.

[0013]

[Problems to be solved by the device]

 The magnet coupling device of the present invention strengthens the pumping action that occurs with the rotation of the outer cylinder 6 and causes a sufficient amount of sterilizing high-temperature fluid to flow through the gap 18 so that This is to enable efficient sterilization.

In the case of the above-mentioned conventional structure, the high temperature fluid is introduced into the gap 18 only by the pumping action of the concave grooves 10 and 10 formed in the lower surfaces of the flanges 9 and 9 of the pair of upper and lower slide bearings 7a and 7b. However, the diameters of the collars 9 and 9 are limited, and the obtained pump action is not so large. Therefore, the amount of the high-temperature fluid flowing in the gap 18 does not increase so much, and the sterilization process in the gap 18 cannot be performed efficiently.

The magnet coupling device of the present invention was devised in view of the above circumstances.

[0016]

[Means for Solving the Problems]

 Like the conventional magnetic coupling device described above, the magnetic coupling device of the present invention liquid-tightly penetrates the bottom plate of the container for storing the liquid to be stirred and extends vertically upward from the upper surface of the bottom plate. A cylindrical inner cylinder whose upper end is closed and whose lower end is open, a supporting columnar part extending vertically upward from the center of the upper end surface of this inner cylinder, and a drive shaft inserted from below into the inner cylinder. The drive-side permanent magnet fixed to the outer peripheral surface of the drive shaft at the inner position of the inner cylinder, the outer cylinder rotatably supported around the inner cylinder, and the outer cylinder fixed to the outer cylinder. The driven side permanent magnet whose inner peripheral surface faces the outer peripheral surface of the drive side 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 outer peripheral surface of the outer cylinder. It is fitted into the inner peripheral surface of the upper end of the cylinder, and its inner peripheral surface slides on the outer peripheral surface of the supporting columnar section. The upper radial sliding bearing that allows the liquid to flow in the vertical direction and the lower inner peripheral surface of the outer cylinder are fitted in the inner peripheral surface of the inner cylinder, and the inner peripheral surface of the inner cylinder is brought into sliding contact with the outer peripheral surface of the inner cylinder. A lower radial sliding bearing that allows the liquid to flow in the vertical direction and at least between the upper end portion of the outer cylinder and the upper end surface of the inner cylinder and a peripheral portion of the supporting columnar portion. It has a thrust slide bearing that allows the flow of air in the radial direction.

In particular, in the magnetic coupling device of the present invention, at least a part of the lower radial slide bearing is provided with a locking hole opened to the outer peripheral surface of the lower radial slide bearing, and At least the lower end of the cylinder has an insertion hole formed in a portion aligned with the locking hole, the insertion hole having a diameter smaller than the locking hole, and the inner end of the locking hole inserted into and fixed to the insertion hole. It is characterized by having a hollow locking pin located in the hole.

[0018]

[Action]

 With the magnet coupling device of the present invention configured as described above, the operation itself when the outer cylinder is rotationally driven through the drive-side permanent magnet and the driven-side permanent magnet when the drive shaft is rotationally driven is the same as that of the above-described conventional one. It is similar to the magnetic coupling device.

Particularly, in the case of the magnet coupling device of the present invention, it is present in the locking pin inserted and fixed in the locking hole at the lower end of the outer cylinder based on the centrifugal force accompanying the rotation of the outer cylinder. A pumping action occurs that causes the fluid to flow diametrically outward. Since this locking pin is provided at a portion away from the center of rotation, and the distance between the inner end opening and the outer end opening is relatively large, the pumping action becomes relatively large, and A relatively large amount of fluid flows from the inner circumference side to the outer circumference side of the outer cylinder.

As a result, it becomes possible to circulate a large amount of high temperature fluid in a short time within the cylindrical gap provided between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder. Sterilization in this gap can be performed efficiently.

[0021]

【Example】

 1 to 4 show an embodiment of the present invention. Similar to the above-mentioned conventional apparatus, the lower end of a cylindrical inner cylinder 2 having an upper end closed and a lower end opened is liquid-tightly penetrated through the center of the bottom plate 1 of the culture tank. Extends vertically upward from the upper surface of the. At the center of the upper end surface of the inner cylinder 2, a supporting columnar part 3 is formed vertically upward.

That is, a support ring 27 is liquid-tightly fixed to the peripheral edge of the circular hole 23 formed in the center of the bottom plate 1 by welding, and the inner cylinder 2 is placed inside the support ring 27. The upper surface of the mounting flange 24 formed at the outer peripheral edge of the lower end portion of the inner cylinder 2 is abutted against the lower surface of the support ring 27. Further, the upper surface of a mounting flange 26 formed on the outer peripheral edge of the upper end portion of the connecting cylinder 25 is abutted against the lower surface of the mounting flange 24. The 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 a lower end opening of the inner cylinder 2, and a drive side permanent member is provided at an inner position of the inner cylinder 2 on an upper outer peripheral surface of the drive shaft 4. The magnet 5 is supported and fixed.

A cylindrical sleeve 19 made of stainless steel is externally fitted and fixed to the outer peripheral surface of the supporting columnar portion 3, and the upper surface of the inner cylinder 2 is provided with abrasion resistance around the supporting columnar portion 3. A thrust bearing plate 20 made of a super hard steel having excellent properties formed in an annular shape is placed. The sleeve 19 is non-rotatably supported on the supporting columnar portion 3 by the screws 21 and 21, and the thrust receiving plate 20 is non-rotatably supported on the inner cylinder 2 by the pins 22 and 22, respectively.

On the other hand, an outer cylinder 6 is rotatably supported around the inner cylinder 2 by a pair of upper and lower slide bearings 7a and 7b. The pair of slide bearings 7a and 7b are made of a slippery material into a shape as shown in FIGS. 6 to 7 to form upper and lower radial slide bearings. Of the slide bearings 7a and 7b, the inner peripheral surface of the cylindrical portion 8 of the upper slide bearing 7a is in sliding contact with the outer peripheral surface of the sleeve 19, and the lower surface of the collar portion 9 is in sliding contact with the upper surface of the thrust receiving plate 20. Contact. Further, the inner peripheral surface of the cylindrical portion 8 of the lower slide bearing 7b is slid on the outer peripheral surface of the cylindrical portion 13 of another sleeve 11a which is non-rotatably fitted and supported on the outer peripheral surface of the lower end portion of the inner cylinder 2. Touching. Further, the lower surface of the collar portion 9 of the plain bearing 7b is floated above the upper surface of the support ring 27 so that the lower surface of the collar portion 9 does not come into sliding contact with any portion.

A portion of the outer cylinder 6 in the vertical middle portion facing the outer peripheral surface of the driving side permanent magnet 5 is a thin portion 15, and the 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 drive permanent magnet 5, and the outer side 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, and these peripheral surfaces are brought into sliding contact with each other as the outer cylinder 6 rotates. I try not to do anything. Then, the fluid existing in the culture tank is allowed to flow into the gap 18 through the grooves 10 and 10 formed in the slide bearings 7a and 7b. The concave grooves 10 and 10 are formed not only on the outer peripheral surface of the cylindrical portion 8 and the upper surface of the collar portion 9 constituting the slide bearings 7a and 7b, but also on the inner peripheral surface of the cylindrical portion 8 and the collar portion 9. It can be formed on the lower surface, or on both the inner and outer peripheral surfaces and the upper and lower surfaces. Further, the recessed grooves 10, 10 formed on the peripheral surface can be inclined with respect to the axial direction, or the recessed grooves 10, 10 formed on the collar portion 9 can be inclined with respect to the diametrical direction.

Further, engaging holes 29, 29 are formed at a plurality of circumferential positions of the cylindrical portion 8 constituting the pair of plain bearings 7 a, 7 b in a state of penetrating both the inner and outer peripheral surfaces of the cylindrical portion 8. Is forming. On the other hand, the upper and lower ends of the outer cylinder 6 are formed with insertion holes 30, 30 having a smaller diameter than the locking holes 29, 29 at the portions aligned with the locking holes 29, 29. Then, inside the insertion holes 30 and 30, hollow locking pins 31 and 31 as shown in FIG. 4 are elastically reduced in outer diameter from the side of the outer end opening of the insertion holes 30 and 30. While press-fitting, the inner ends of the locking pins 31, 31 are inserted into the locking holes 30, 30 as shown in detail in FIGS.

In the illustrated embodiment, the inner cylinder 2 is also formed with concave grooves 10 and 10 on the lower end surface thereof for inducing a pumping action to be described later. 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. An attachment 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 and 35. This stirring blade 33 is also provided with a stirring blade separately. Further, at the upper end of the inner cylinder 2 and at the lower side of the mounting flange 34, through holes 36, 36 for communicating the inside and the outside of the inner cylinder 2 are formed.

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

In particular, in the case of the magnet coupling device of the present invention, due to the centrifugal force caused by the rotation of the outer cylinder 6, the locking holes 29, 29 formed in the upper and lower end portions of the outer cylinder 6 are accommodated. A pump action occurs in which the fluid present in the inserted and fixed locking pins 31, 31 is caused to flow outward in the diametrical direction. This pumping action occurs not only in the inner portions of the locking pins 31, 31, but also in the flange portions 9, 9 of the slide bearings 7a, 7b and the concave grooves 10, 10 formed in the lower end surface of the outer cylinder 6.

Of the respective locking pins 31, 31, particularly the locking pins 31, 31 inserted and fixed in the locking holes 29, 29 at the lower end portion of the outer cylinder 6 are provided at the portions apart 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 that occurs in the recessed grooves 10, 10. Therefore, a relatively large amount of fluid flows from the inner peripheral side to the outer peripheral side of the outer cylinder 6.

As a result, a large amount of high temperature fluid can be circulated in a cylindrical gap 18 provided between the inner peripheral surface of the outer cylinder 6 and the outer peripheral surface of the inner cylinder 2 in a short time. This enables the sterilization process in the gap 18 to be performed efficiently.

In the illustrated embodiment, the durability of the bearing portion that rotatably supports the outer cylinder 6 with respect to the inner cylinder 2 is improved, the number of times of parts replacement is reduced, and the magnetic coupling is improved. It is possible to simplify the maintenance management of the device.

That is, among the culture solutions stored in the culture tank, there are some that precipitate hard crystals with changes in temperature and concentration. If such crystals occur in the magnet coupling portion and enter the sliding surface between the slide bearings 7a and 7b and the mating member, the slide bearings 7a and 7b and the mating member will be 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 portion 9 of the lower slide bearing 7b and the flange portion 14 of the sleeve 11b. Moreover, since a large thrust load is applied, the wear becomes significant.

Therefore, in the case of the illustrated embodiment, the collar portion 9 of the lower slide bearing 7b is floated from the upper surface of the support ring 27 so that the lower surface of the collar portion 9 and the mating member do not come into sliding contact with each other. It 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 a thrust slide bearing constituted by the flange portion 9 of the upper slide bearing 7a and the thrust receiving plate 20. Will be supported. However, the slide bearing 7a portion is hard to be infiltrated with crystals that cause remarkable wear, and the thrust bearing plate 20 is made of super-hard steel having excellent wear resistance. Will be minor.

[0037]

[Effect of device]

 Since the magnetic coupling device of the present invention is constructed and operates as described above, it is possible to facilitate the circulation of the high temperature fluid for sterilization into the internal clearance to improve the efficiency of the sterilization work, including the sterilization work. The culture work time can be shortened.

[Brief description of drawings]

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

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is an enlarged view of the B section.

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

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

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

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

[Explanation of Codes] 1 Bottom plate 2 Inner cylinder 3 Supporting cylindrical portion 4 Drive shaft 5 Driving side permanent magnet 6 Outer cylinder 7a, 7b Sliding bearing 8 Cylindrical portion 9 Collar portion 10 Recessed groove 11a, 11b Sleeve 12 Pin 13 Cylindrical portion 14 Collar Part 15 Thin part 16 Driven permanent magnet 17 Cover 18 Gap 19 Sleeve 20 Thrust receiving plate 21 Screw 22 Pin 23 Circular hole 24 Mounting flange 25 Connection tube 26 Mounting flange 27 Support ring 28 Bolt 29 Locking hole 30 Insertion hole 31 Locking Pin 32 Stirring blade 33 Stirring shaft 34 Mounting flange 35 Bolt 36 Through hole

Claims (1)

[Scope of utility model registration request] 1. A cylindrical inner cylinder that extends liquid-tightly through a bottom plate of a container for storing a liquid to be stirred and extends upward in the vertical direction from an upper surface of the bottom plate, and has an upper end closed and a lower end opened. A supporting columnar portion extending vertically upward from the center of the upper end surface of the inner cylinder, and a drive shaft inserted into the inner cylinder from below,
A drive-side permanent magnet fixed to the outer peripheral surface of the drive shaft at the inner position of the inner cylinder, an outer cylinder rotatably supported around the inner cylinder, and an inner circumference fixed to the outer cylinder. A driven permanent magnet whose surface faces the outer peripheral surface of the drive 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 are fitted into the inner peripheral surface of the support cylindrical portion. An upper radial slide bearing slidably contacting the surface and allowing the liquid to flow in the vertical direction, and a lower inner peripheral surface of the outer cylinder, the inner peripheral surface of which is slid on the outer peripheral surface of the inner cylinder. A lower radial plain bearing that allows the liquid to flow in the up-down direction, and is provided between at least the upper end portion of the outer cylinder and the peripheral portion of the support columnar portion at the upper end surface of the inner cylinder. In a magnetic coupling device provided with a thrust slide bearing that allows the liquid to flow in the radial direction, at least a part of the lower radial slide bearing is provided with an opening on the outer peripheral surface of the lower radial slide bearing. Locking hole and at least the lower end of the outer cylinder, And an insertion hole formed in a portion aligned with the locking hole, which has a diameter smaller than that of the locking hole, and a hollow member whose inner end is positioned in the locking hole while being inserted and fixed in the insertion hole. A magnet coupling device characterized by having a locking pin.