JP6216362B2 - Stirring blade - Google Patents

Description

  The present invention relates to a stirring blade, and more particularly to a stirring blade in which a blade member can be detached from a stirring shaft.

  For production of chemical products, pharmaceuticals, etc., an agitation device that performs an agitation process such as mixing, crystallization, and concentration of an object to be treated is used. The stirring device includes a stirring container that stores a content liquid that is an object to be processed, and a stirring blade provided inside the stirring container. The stirring blade has a stirring shaft extending in the vertical direction and a blade member having a boss fixed to the stirring shaft. The stirring blade is connected to an electric motor provided outside the stirring container, and the content liquid is stirred by driving the electric motor to rotate the stirring blade.

  For the content liquid, a corrosive material such as an acid, a polymer, a medicine, or a dye is used. On the other hand, since the stirring blade is formed of a metal material such as carbon steel, if the carbon steel is exposed inside the stirring vessel, it is corroded by the content liquid. Therefore, there is a glass lining treatment that coats a glass layer on the outer surface of the stirring blade so that the stirring blade is not corroded by the liquid contents (see, for example, Patent Document 1).

  Here, the stirring device may be replaced with a stirring blade having a different shape of the blade member depending on the use of the stirring treatment or the like. Therefore, the boss of the blade member is configured to be detachable from the stirring shaft. In the stirring blade shown in Patent Document 1, the boss of the blade member is detachably attached to the stirring shaft by cold fitting. Specifically, liquid nitrogen is introduced into the stirring vessel and the stirring shaft is cooled to shrink the outer diameter. And after fitting the boss | hub of the blade member in the stirring shaft, liquid nitrogen is discharged | emitted from the inside of a stirring container. Then, when the stirring shaft becomes normal temperature and the outer diameter returns to the original length, the outer peripheral surface of the stirring shaft contacts the inner peripheral surface of the boss, and the boss is attached to the stirring shaft. When removing the blade member from the stirring shaft, the reverse procedure is performed.

Japanese Patent Laid-Open No. 61-178029

  However, in order to attach and detach the boss of the wing member to the stirring shaft by cold fitting, as described above, liquid nitrogen is added and the stirring shaft is shrunk at a low temperature, liquid nitrogen is discharged and the stirring shaft is returned to room temperature. Since work is required, there was a problem that workability deteriorated. In addition, when the blade member can be attached to and detached from the stirring shaft by a method other than cold fitting, for example, when considering screw fixing, the joint portion between the blade member and the stirring shaft is threaded, and the glass lining treatment Therefore, there is a possibility that the joint portion is corroded by the content liquid.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve workability of an attaching / detaching operation of a stirring shaft and a blade member in a stirring blade, and to prevent corrosion at a joint portion between the blade member and the stirring shaft.

  A stirring blade according to an aspect of the present invention has a main body portion whose outer surface is subjected to a glass lining process, and a fixed portion protruding from the lower end surface of the main body portion, and the stirring blade extends in the vertical direction inside the stirring tank. A wing member having a boss portion detachably attached to the fixed portion, a glass lining treatment is performed on the shaft, and an upper end surface facing the lower end surface of the main body portion with an interval in the vertical direction, and the wing member of the main body portion A resin seal member disposed between the lower end surface and the upper end surface of the boss portion and having corrosion resistance, and the fixing portion has a male screw formed on an outer surface not subjected to glass lining treatment. The boss part opens downward from the upper end surface, has a screw hole in which an internal thread is formed on the inner peripheral surface not subjected to the glass lining process, and the internal thread is fastened to the external thread. The seal member is Is sandwiched between the said upper end surface of said lower end surface and the boss portion.

  According to the above configuration, since the female screw of the boss portion is fastened to the male screw of the fixing portion of the stirring shaft, the wing member can be attached to and detached from the stirring shaft by screw fixing, and the wing member is removed from the stirring shaft by cold fitting. Compared with the configuration in which it is attached and detached, workability is improved because work such as low-temperature shrinkage of the stirring shaft by liquid nitrogen is unnecessary. Further, when the female screw of the boss part is fastened to the male screw of the stirring shaft, the seal member is pressed by the boss part and compressed in the vertical direction, so that the seal member is the upper end face of the boss part and the lower end face of the main body part. The liquid tightness is ensured. Therefore, it is possible to prevent the content liquid from entering the fastening portion between the male screw of the stirring shaft and the female screw of the boss portion that has not been subjected to the glass lining treatment, and corrosion of the portion.

  In the above aspect, the seal member includes an annular upper groove portion formed on a surface facing the lower end surface of the main body portion and an annular lower groove portion formed on a surface facing the upper end surface of the boss portion. A first O-ring fitted to the upper groove, and a second O-ring fitted to the lower groove, and the female screw is fastened to the male screw. Thus, the first O-ring may be in pressure contact with the lower end surface of the main body portion, and the second O-ring may be in pressure contact with the upper end surface of the boss portion.

  When only a single seal ring is used as the seal member, groove processing may be necessary on the glass lining surface for positioning the seal ring. However, at the time of the grooving operation, a chamfering operation that rounds the corners of the groove is necessary to prevent the peeling of the glass layer, and the glass lining surface facing the seal ring in consideration of the chamfering processing. Need to be larger. However, according to the above configuration, the sealing member has the fluororesin member provided with the groove portion for positioning the O-ring, so that the lower end surface of the main body portion that is the glass lining surface and the upper end surface of the boss portion are grooved. Therefore, the workability can be improved and the glass lining surface can be prevented from being enlarged.

  In the above aspect, the fixing portion further includes a convex portion that protrudes radially outward from the upper side of the male screw and whose tip is positioned radially inward from the outer peripheral edge of the lower end surface of the main body portion, the boss portion Is recessed from the upper side of the female screw in the radial direction, and has a concave part formed with a contact surface facing the lower end surface of the convex part in the vertical direction, and the lower end surface of the main body part and the boss part The clearance between the upper end surface of the sealing member and the upper end surface is set to a size that allows the compressive deformation of the seal member to be maintained in the elastic region in a state where the contact surface of the concave portion is in contact with the lower end surface of the convex portion. It may be.

  According to the above configuration, when the female screw of the boss part is fastened to the male screw of the stirring shaft, the contact surface of the boss part comes into contact with the lower end surface of the convex part. By restricting the amount of compressive deformation of the seal member so as not to be excessively pressed, the seal member is plastically deformed beyond the elastic region, and between the seal member and the main body portion of the stirring shaft or between the seal member and the boss portion. It is possible to prevent the content liquid from entering through the gap by generating the gap.

  In the above aspect, the agitation shaft includes a suspension shaft including a screw portion in which the male screw is formed, and a housing including the main body portion in which a space through which the suspension shaft is inserted is relatively rotatable. You may have.

  According to the above configuration, when the blade member is rotated to fix the agitation shaft and the blade member to the screw, if the blade member rotates relative to the upper end surface of the boss portion in contact with the seal member, the seal member is rubbed. Occurs. However, according to the above configuration, the female screw can be fastened to the male screw by relatively rotating the wing member and the lifting shaft without relatively rotating the wing member and the housing that sandwich the seal member. Therefore, friction is prevented from occurring in the seal member when the wing member is attached and detached, and the life of the seal member can be increased.

  The said form WHEREIN: The said housing | casing may further include the fitting part fitted to the said boss | hub part so that rotation with respect to the said wing | blade member is impossible.

  According to the above configuration, when the screw portion of the suspension shaft is screwed to the boss portion of the wing member, the fitting portion of the housing is fitted to the boss portion and cannot rotate with respect to the wing member. There is no need to support the wing member in order to prevent the wing member from co-rotating with the suspension shaft, and workability can be improved. Further, according to the above configuration, since the torque load generated when the stirring blade is rotated for the stirring process is also borne in the fitting portion between the boss portion and the housing, the male screw and the female screw An excessive torque load can be prevented from acting on the screw fastening portion, and a good fastening state is realized.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the workability | operativity of the attachment or detachment operation | work with a stirring shaft and a blade member in a stirring blade, corrosion of the coupling | bond part of a blade member and a stirring shaft can be prevented.

FIG. 1 is a cross-sectional view of a stirring device provided with a stirring blade according to the first embodiment as viewed from the front. FIG. 2 is an enlarged view of a fixed portion of the stirring shaft and the blade member in the stirring blade of FIG. FIG. 3 is an exploded view of the stirring blade of FIGS. FIG. 4 is a partially enlarged view of the stirring blade according to the second embodiment. FIG. 5 is a partially enlarged view of the stirring blade according to the third embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is an enlarged view between the shaft insertion port and the rotation driving device in the stirring device including the stirring blade according to the third embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or corresponding element through all the figures, and the detailed description which overlaps is abbreviate | omitted.

(First embodiment)
FIG. 1 is a cross-sectional view of a stirring device 1 provided with a stirring blade 3 according to the first embodiment when viewed from the front. In the following, for the sake of convenience, the direction of the stirring device 1 will be described with the left side of the paper as “left” and the right side of the paper as “right”.

  As shown in FIG. 1, the stirring device 1 includes a stirring tank 2. The agitation tank 2 is a substantially cylindrical container, and stores the content liquid to be agitated by the rotational drive of the agitation blade 3. The stirring blade 3 is provided so as to overlap the vertical axis J <b> 1 at the substantially center in the left-right direction of the stirring tank 2. The detailed configuration and shape of the stirring blade 3 will be described later. The content liquid stirred by the stirring blade 3 is taken out from the discharge port 21a provided in the bottom wall 21 of the stirring tank 2 to the external space.

  The stirring tank 2 is provided with a circular opening 22a on the upper wall 22 so as to communicate with the external space. The opening 22a of the upper wall 22 is closed by a disc-like lid 7 so as to be opened and closed. Specifically, the peripheral edge of the lid 7 is fixed to the peripheral edge of the opening 22a by a clamp 23. For maintenance of the stirring blade 3, the operator can enter and leave the stirring tank 2 through the opening 22a by removing the clamp 23 and removing the lid 7.

  On the upper wall 22 of the stirring tank 2, the upper end of the baffle 8 is fixed on the opposite side of the lid 7 in the left-right direction. The baffle 8 is a long member extending in the vertical direction, and its lower end extends to the vicinity of the bottom wall 21 of the stirring tank 2 and is located above the blade member 5 of the stirring blade 3. Since the baffle 8 extends in the vertical direction inside the stirring tank 2, the content liquid is not only stirred in the circumferential direction along the inner wall surface of the stirring tank 2 by the rotational drive of the stirring blade 3, but also in the vertical direction. Also, the content liquid is uniformly stirred by being stirred. A stirring blade 3 is provided between the lid 7 and the baffle 8 in the left-right direction.

  The stirring blade 3 includes a stirring shaft 4, a blade member 5, and a seal member 6. The stirring shaft 4 is inserted into the stirring tank 2 from a shaft insertion port 22 b provided in the upper wall 22 of the stirring tank 2. And the stirring shaft 4 is extended in the up-down direction so that it may overlap with the vertical axis line J1 inside the stirring tank 2. FIG. The upper end of the stirring shaft 4 is rotatably supported by a rotation driving device 9 provided above the stirring tank 2. Here, the rotation drive device 9 is, for example, an electric motor with a reduction gear. The electric motor 9 is supported from below by a substantially cylindrical frame 11 fixed to the stirring tank 2. A blade member 5 is fixed to a lower end of the stirring shaft 4 and a seal member 6 is attached to the lower end of the stirring shaft 4. A plurality of openings (not shown) are provided in the upper part of the stirring tank 2.

  FIG. 2 is an enlarged view of a fixed portion of the stirring shaft 4 and the blade member 5 in the stirring blade 3 of FIG. As shown in FIG. 2, the stirring shaft 4 includes a main body portion 41 and a fixing portion 42 that partially protrudes from the lower end surface 41 a of the main body portion 41. The stirring shaft 4 is a metal material such as carbon steel, for example. The wing member 5 includes a boss portion 51 and a plurality of (for example, two) blade plate portions 52 extending in the radial direction from the boss portion 51. The vane plate portion 52 is integrally fixed to the outer surface of the boss portion 51 by welding or the like. Both the boss portion 51 and the blade plate portion 52 are, for example, a metal material such as carbon steel, like the stirring shaft 4. The boss portion 51 is detachably fixed to the fixing portion 42 of the stirring shaft 4. In the fixed state, the upper end surface 51 a of the boss portion 51 is spaced apart from the lower end surface 41 a of the main body portion 41 in the vertical direction. Facing each other.

  The seal member 6 is sandwiched between the lower end surface 41 a of the main body portion 41 and the upper end surface 51 a of the boss portion 51. The seal member 6 includes an annular and plate-like fluorine-based resin member 61, a first O ring 62, and a second O ring 63. The fluorine-based resin member 61 is an annular member and has corrosion resistance against the content liquid. The fluorine-based resin member 61 includes, for example, tetrafluoroethylene resin (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP), It is formed using a fluororesin material selected from tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer resin (EPE), tetrafluoroethylene-ethylene copolymer resin (ETEE) and the like. The fluorine-based resin member 61 may contain glass or carbon for reinforcing the strength.

  In the fluorine-based resin member 61, an annular upper groove 61a is formed on the flat upper end surface facing the lower end surface 41a of the main body 41, and at the flat lower end surface facing the upper end surface 51a of the boss portion 51. An annular lower groove 61b is formed. A first O-ring 62 is fitted in the upper groove 61a, and a second O-ring 63 is fitted in the lower groove 61b. As described above, the grooves 61 a and 61 b of the fluorine-based resin member 61 are provided for positioning the O-rings 62 and 63. Any material of the first O-ring 62 and the second O-ring 63 is a rubber having corrosion resistance against the content liquid, but is not limited thereto, and may be silicone, for example. Further, in order to provide corrosion resistance to the content liquid, the outer surface of each of the first O ring 62 and the second O ring 63 may be coated with a fluorine-based resin, or the first O ring 62 and the second O ring 63 itself Further, it may be formed of a fluorine resin solid.

  FIG. 3 is an exploded view of the stirring blade 3 of FIG. As shown in FIG. 3, the main body 41 has a shape in which the outer diameter increases in the vertical direction as a portion near the lower end surface 41a extends downward. On the lower end surface 41 a of the main body 41, an annular groove 41 b is formed around the fixed portion 42 at the boundary portion with the fixed portion 42. The groove portion 41 b is formed by recessing the lower end surface 41 a upward around the base portion of the fixed portion 42. In the present embodiment, a portion of the outer surface of the main body 41 excluding the groove 41b formed on the lower end surface 41a is a glass lining surface coated with a glass layer GL by a glass lining process.

  The glass lining process is a process of forming a glass layer by applying a glass to the surface of a metal material and then baking it to bond a glass having excellent corrosion resistance to the surface of the metal material. In the present embodiment, the thickness of the glass layer GL is, for example, 1 mm. By forming the glass layer GL on the outer surface of the main body 41, the main body 41 can have corrosion resistance against the corrosive content liquid such as an acid, a polymer or a medicine.

  The fixing part 42 has a substantially cylindrical shape and includes a first fixing part 42a and a second fixing part 42b having different outer diameters. The outer surfaces of the first fixing portion 42a and the second fixing portion 42b are both non-glass lining surfaces that have not been subjected to the glass lining treatment. A male screw 71 is formed on the outer surface of the first fixed portion 42a by machining. The second fixing portion 42 b extends upward from the upper end of the first fixing portion 42 a and is connected to the center of the lower end surface 41 a of the main body portion 41. The second fixing portion 42 b has a larger diameter than the first fixing portion 42 a, protrudes radially outward from the upper side of the male screw 71, and the tip thereof is radial from the outer peripheral edge of the lower end surface 41 a of the main body portion 41. Located inside. That is, the lower part of the second fixing part 42b functions as an annular convex part 42c that protrudes radially outward from the first fixing part 42a when viewed from below.

  On the other hand, the boss portion 51 has a screw hole 51b that opens downward from its upper end surface 51a. A glass lining process is not performed on the inner peripheral surface of the screw hole 51b, and a female screw 72 is formed by machining. In this embodiment, the blade member 5 is rotated with respect to the stirring shaft 4 by rotating the blade member 5 around the vertical axis J1 so that the female screw 72 of the boss portion 51 is fastened to the male screw 71 of the fixing portion 42. And attach. Thus, the blade member 5 can be attached to and detached from the stirring shaft 4 by screw fixing. Thereby, it becomes possible to replace the blade member 5 with another blade member having a different shape or the like of the blade plate portion 52 in accordance with the use of the stirring process. During the replacement operation, the blade member 5 is taken in and out from the opening / closing opening 22 a of the stirring tank 2.

  Further, the boss 51 has an annular recess 51 c that is recessed radially outward on the upper side of the female screw 72. A contact surface 51ca is formed in the recess 51c so as to face the lower end surface 42ca of the projection 42c of the fixed portion 42 in the vertical direction. When the female screw 72 is fastened to the male screw 71, the contact surface 51ca of the concave portion 51c contacts the lower end surface 42ca of the convex portion 42c.

  Further, an annular groove 51d is formed on the upper end surface 51a of the boss 51 around the recess 51c at the boundary with the recess 51c. The groove 51d is formed by recessing the upper end surface 51a downward in the outer periphery of the recess 51c. In the present embodiment, the portion of the surface of the boss portion 51 excluding the screw hole 51b, the concave portion 51c and the groove portion 51d is a glass lining surface coated with a GL layer by a glass lining process. That is, the upper end surface 51a, the outer side surface 51e, and the lower end surface 51f of the boss portion 51 are glass lining surfaces, and the outer surface of the blade plate portion 52 is also a glass lining surface. On the other hand, in the boss portion 51, the inner peripheral surface of the screw hole 51b, the inner surface of the recess 51c (including the contact surface 51ca), and the groove portion 51d are non-glass lining surfaces that are not subjected to the glass lining treatment.

  When the female screw 72 of the boss part 51 is fastened to the male screw 71 of the fixing part 42, the seal member 6 is sandwiched between the lower end surface 41 a of the main body part 41 and the upper end face 51 a of the boss part 51. . The seal member 6 is pressed from below by the boss portion 51 and compressed in the vertical direction. Specifically, the first O ring 62 is in pressure contact with the lower end surface 41 a of the main body 41, and the second O ring 63 is in pressure contact with the upper end surface 51 a of the boss portion 51.

  Furthermore, the fluorine-based resin member 61 is also compressed and deformed in the vertical direction. Here, when the female screw 72 of the boss portion 51 is fastened to the male screw 71 of the fixing portion 42, the contact surface 51ca of the concave portion 51c contacts the lower end surface 42ca of the convex portion 42c. In this state, a gap L between the lower end surface 41a of the main body portion 41 and the upper end surface 51a of the boss portion 51 is set to a dimension in which the compressive deformation of the fluororesin member 61 is maintained in the elastic region ( (See FIG. 2).

  The stirring blade 3 configured as described above has the following effects.

  Since the female screw 72 of the boss portion 51 is fastened to the male screw 71 of the fixing portion 42 of the stirring shaft 4, the wing member 5 can be attached to and detached from the stirring shaft 4 by screwing, and the wing member is removed by cold fitting. Compared with the configuration that is attached to and detached from the above, workability is improved because work such as low-temperature shrinkage of the stirring shaft by liquid nitrogen is unnecessary. Further, when the female screw 72 of the boss portion 51 is fastened to the male screw 71 of the stirring shaft 4, the seal member 6 is pressed by the boss portion 51 and compressed in the vertical direction. Liquid tightness is secured by closely contacting the upper end surface 51a and the lower end surface 41a of the main body 41. Therefore, it is possible to prevent the content liquid from entering the fastening portion between the male screw 71 of the stirring shaft 4 and the female screw 72 of the boss portion 51 that are not subjected to the glass lining treatment, and corroding the portion.

  Further, in the stirring blade subjected to the glass lining treatment, a round surface is chamfered on the inner peripheral surface of the boss of the blade member in order to prevent the glass layer from peeling off. Therefore, in the configuration in which the boss is attached to the stirring shaft by cold fitting, a space for storing the liquid content is formed between the outer peripheral surface of the stirring shaft and the inner peripheral surface of the boss, and the liquid pool remains. Then, there existed a possibility that a contamination might generate | occur | produce in the inside of a stirring tank. In the present embodiment, the fastening portion between the blade member 5 and the stirring shaft 4 is not subjected to the glass lining process and is screwed, so that the inner peripheral surface of the boss portion 51 of the blade member 5 has a round surface. There is no need to chamfer. Further, the seal member 6 is in close contact with the upper end surface 51a of the boss portion 51 and the lower end surface 41a of the main body portion 41, and liquid tightness is ensured. Thereby, it is possible to prevent the content liquid from collecting in the fastening portion between the stirring shaft 4 and the boss portion 51 of the blade member 5.

  Further, in the configuration in which the blade member is attached to and detached from the stirring shaft by cold fitting, the content liquid enters the joint portion between the boss of the blade member and the stirring shaft while the stirring device is used, and the content liquid remains. When the work of removing the wing member from the stirring shaft is performed, the wing member may be difficult to remove. In the present embodiment, since the seal member 6 is in close contact with the upper end surface 51a of the boss portion 51 and the lower end surface 41a of the main body portion 41 to ensure liquid tightness, the stirring shaft 4 and the boss portion of the blade member 5 It is possible to prevent the content liquid from entering the fastening portion, and the workability when removing the wing member 5 can be improved.

  Further, when only a single seal ring is used as the seal member, it is necessary to perform groove processing on the glass lining surface for positioning the seal ring. However, at the time of the grooving operation, a chamfering operation that rounds the corners of the groove is necessary to prevent the peeling of the glass layer, and the glass lining surface facing the seal ring in consideration of the chamfering processing. Need to be larger. However, in the present embodiment, the seal member 6 includes the fluororesin member 61 provided with the groove portions 61a and 61b for positioning the O-rings 62 and 63, so that the lower end surface 41a of the main body portion 41 which is a glass lining surface. In addition, it is not necessary to groove the upper end surface 51a of the boss portion 51, workability can be improved, and an increase in the size of the glass lining surface can be prevented.

  Further, when the female screw 72 of the boss portion 51 is fastened to the male screw 71 of the stirring shaft 4, the contact surface 51ca of the boss portion 51 contacts the lower end surface 42ca of the convex portion 42c, thereby tightening the boss portion 51. Therefore, the amount of compressive deformation of the fluororesin member 61 is restricted so that the fluororesin member 61 is not excessively pressed. As a result, the fluorine-based resin member 61 is plastically deformed beyond the elastic region, and a gap is generated between the fluorine-based resin member 61 and the main body portion 41 or the seal member 6 of the stirring shaft 4 and the boss portion 51. The liquid can be prevented from entering from the gap.

  Further, by forming a groove 41b around the fixed portion 42 on the lower end surface 41a of the main body 41, when the outer surface of the main body 41 is subjected to a glass lining process, the glass lining surface and the non-glass are provided via the groove 41b. By separating the lining surface, the glass applied to the glass lining surface can be prevented from adhering to the outer peripheral surface of the fixed portion 42 which is a non-glass lining surface. That is, the glass layer GL of the main body portion 41 is separated from the fixing portion 42 via the groove portion 41b, and the stress generated in the fixing portion 42 can be made difficult to be transmitted to the glass layer GL. In addition, the groove 51d is formed around the recess 51c on the upper end surface 51a of the boss 51, so that when the outer surface of the boss 51 is glass-lined, the contact surface of the recess 51c, which is a non-glass lining surface. It is possible to prevent the glass from adhering to 51ca and the like. That is, the glass layer GL of the boss 51 is separated from the screw hole 51b and the recess 51c via the groove 51d, and the stress generated in the screw hole 51b and the recess 51c can be hardly transmitted to the glass layer GL. It becomes. In addition, the groove part 41b and the groove part 51d are not an essential structure, and do not need to be provided in the stirring blade 3. FIG.

(Second Embodiment)
The stirring blade 13 according to the second embodiment is obtained by partially deforming the stirring blade 3 according to the first embodiment. Below, about the stirring blade 13 which concerns on 2nd Embodiment, a different point from 1st Embodiment is demonstrated.

  FIG. 4 is a partially enlarged view of the stirring blade 13 according to the second embodiment. As shown in FIG. 4, the stirring shaft 14 of the stirring blade 13 has a housing 15 and a lifting shaft 16. The casing 15 has a main body portion 15a whose outer diameter increases in the vertical direction as a portion near the lower end surface extends downward, and a protruding portion 15b that partially protrudes downward from the lower end surface of the main body portion 15a. have. In addition, a space S into which the lifting shaft 16 and a jig 200 described later are inserted is formed in the housing 15. The suspension shaft 16 and the jig 200 are relatively rotatable around the vertical axis J2 in the space S of the housing 15. An annular ring portion 15c that protrudes inward in the radial direction from the inner peripheral surface of the main body portion 15a and extends to the inner peripheral surface of the protruding portion 15b is formed in the lower portion of the housing 15.

  The suspension shaft 16 includes a first shaft portion 16a having a lower end surface that contacts the upper end surface of the annular portion 15c, and a second shaft portion that is continuous from the lower end surface of the first shaft portion 16a and extends to the lower end of the projecting portion 15b. 16b and a third shaft portion 16c projecting downward from the second shaft portion 16b. Each of the shaft portions 16a to 16c of the suspension shaft 16 has a substantially cylindrical shape.

  At the upper end of the first shaft portion 16a, a jig 200 having a polygonal column shape (for example, a quadrangular column shape or a hexagonal column shape) equal to or slightly smaller than the outer diameter of the first shaft portion 16a. The lower end 200a is inserted. Thereby, the jig 200 is fixed in the rotational direction with respect to the lifting shaft 16. When an operator or the like rotates the jig 200 around the vertical axis J2 when attaching the blade member 5 to the stirring shaft 14, the suspension shaft 16 can also rotate relative to the vertical axis J2 inside the housing 15. Become. Here, the jig 200 is inserted into the first shaft portion 16a of the lifting shaft 16 when the blade member 5 is attached to the stirring shaft 14, and after the attachment of the blade member 5 is completed, the jig 200 is cured. The tool 200 is removed from the first shaft portion 16a. When fixing the lifting shaft 16 to the jig 200, the upper end portion of the first shaft portion 16 a of the lifting shaft 16 may be inserted into the lower end portion 200 a of the jig 200.

  The second shaft portion 16b partially protrudes from the lower end surface of the first shaft portion 16a and has an outer diameter smaller than that of the first shaft portion 16a. Moreover, the outer peripheral surface of the 2nd axial part 16b is covered with the annular part 15c and the protrusion part 15b. The third shaft portion 16c is a screw portion having the same outer diameter as the second shaft portion 16b and having an external thread 71 formed on the outer peripheral surface thereof.

  Here, the main body portion 15a of the present embodiment constitutes a main body portion 141 corresponding to the main body portion 41 of the first embodiment, and the protruding portion 15b of the protruding portion 15b and the second shaft portion 16b of the present embodiment. The portion whose outer peripheral surface is covered by the third shaft portion 16c and the third shaft portion 16c constitute a fixing portion 142 corresponding to the fixing portion 42 of the first embodiment. Further, the lower portion of the protruding portion 15b protrudes radially outward from the third shaft portion 16c when viewed from below, so that it functions as an annular protruding portion 142c corresponding to the protruding portion 42c of the first embodiment. ing. Other configurations are the same as those in the first embodiment. Below, the attachment procedure to the stirring shaft 14 of the blade member 5 in this embodiment is demonstrated.

  First, the lower end portion 200a of the jig 200 is fixed to the upper end of the first shaft portion 16a, and the seal member 6 is attached to the stirring shaft 14 so that the first O-ring 62 contacts the lower end surface 141a of the main body portion 141. Next, the tip of the male screw 71 formed on the third shaft portion 16c is formed on the female screw 72 formed on the screw hole 51b so that the center of the screw hole 51b of the boss portion 51 overlaps the vertical axis J2. The wing member 5 is positioned so as to engage with each other. Here, the blade plate 52 of the wing member 5 is supported by an operator, a fixed base, or the like so that the wing member 5 does not rotate with the suspension shaft 16 when the suspension shaft 16 rotates. . Then, the jig 200 is rotated around the vertical axis J2, and the lifting shaft 16 is rotated around the vertical axis J2, whereby the male screw 71 is screwed into the female screw 72, and the wing member 5 is moved upward. It is attached to the fixed part 142 of the stirring shaft 14 so as to be pulled up.

  Further, when the female screw 72 is fastened to the male screw 71 and the contact surface 51ca of the boss portion 51 contacts the lower end surface of the convex portion 142c, the lower end surface of the first shaft portion 16a is a circle of the housing 15. It is in contact with the upper end surface of the ring portion 15c. Thus, when the blade member 5 is attached to the stirring shaft 14, the suspension shaft 16 to which the blade member 5 is fixed is prevented from coming out downward from the housing 15.

  According to the configuration described above, as in the first embodiment, the female screw 72 of the boss portion 51 is fastened to the male screw 71 of the third shaft portion (screw portion) 16c. 14 can be attached and detached by screw fixing, and workability is improved. Further, when the female screw 72 is fastened to the male screw 71, the contact surface 51ca of the boss portion 51 contacts the lower end surface of the convex portion 142c. Thereby, the amount of compressive deformation of the fluororesin member 61 is restricted so that the fluororesin member 61 is not excessively pressed by the overtightening of the male screw 71.

  Further, when the blade member 5 is rotated to fix the stirring shaft 4 and the blade member 5 with screws, if the blade member 5 is relatively rotated while the upper end surface 51a of the boss portion 51 is in contact with the seal member 6, the seal is obtained. Friction occurs in the member 6. Therefore, in the configuration in which the blade member 5 is rotated and attached to the stirring shaft 4, when the upper end surface 51 a of the boss portion 51 comes into contact with the second O ring 63 of the seal member 6, the second O ring 63 is attached to the blade member 5. There is a fear that the liquid-tightness between the boss portion 51 and the seal member 6 cannot be sufficiently ensured due to the twist due to the rotation.

  However, in this embodiment, when attaching to the stirring shaft 14, the blade member 5 is supported so as not to rotate together with the lifting shaft 16, and only the lifting shaft 16 is rotated around the vertical axis J2. That is, the female screw 72 can be fastened to the male screw 71 by relatively rotating the wing member 5 and the lifting shaft 16 without relatively rotating the wing member 5 and the housing 15 that sandwich the seal member 6. . Therefore, friction is prevented from occurring in the second O-ring 63 when the wing member 5 is attached / detached, and the second O-ring 63 can be pressed against the upper end surface 51a of the boss portion 51 without being twisted. Liquid tightness with the seal member 6 can be ensured.

(Third embodiment)
A stirring blade 203 according to the third embodiment is obtained by partially deforming the stirring blade 13 according to the second embodiment. Below, the point different from 2nd Embodiment is demonstrated about the stirring blade 203 which concerns on 3rd Embodiment.

  FIG. 5 is a partially enlarged view of the stirring blade 203 according to the third embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIGS. 5 and 6, the casing 215 of the stirring shaft 204 includes a fitting portion 215 b that fits non-rotatably with the boss portion 251 of the blade member 205. In the present embodiment, the housing 215 is non-rotatable by being engaged with the boss portion 251 by the key structure. Specifically, in the boss portion 251, a key groove portion 251g that is recessed radially outward from a part of the inner side surface of the recess 251c is formed extending in the axial direction. In addition, the fitting portion 215b of the housing 215 integrally protrudes radially outward from a cylindrical portion 215d that partially protrudes in a cylindrical shape from the lower end surface of the main body portion 215a and a part of the outer surface of the cylindrical portion 215d. And a key portion 215e engaged with the key groove portion 251g. The structure for making the housing 215 unrotatable with respect to the boss 251 is not limited to the key structure as in the present embodiment, and may be a spline structure. The key structure may be configured by providing a groove extending in the axial direction on each of the outer surface of the housing 215 and the inner surface of the boss 251 and inserting a substantially rectangular parallelepiped member that fits into the groove. Good.

  Further, the major axis L1 of the fitting part 215b of the housing 215 is larger than the minor axis of the concave part 251c of the boss part 251 (see FIG. 6). Under this condition, the housing 215 cannot rotate with respect to the boss 251. Therefore, the structure in which the housing 215 cannot rotate with respect to the boss portion 251 may be a structure other than the key structure or the spline structure as long as the above condition is satisfied. For example, in the cross-sectional view orthogonal to the axial direction, the concave portion and the fitting portion of the boss portion may have a non-circular shape such as an oval shape.

  In the space S of the housing 215 fixed to the boss 251, the lifting shaft 216 is inserted so as to be relatively rotatable. On the upper surface of the first shaft portion 216a of the suspension shaft 216, a protruding portion 216d protruding upward is provided. The projecting portion 216d has a polygonal shape (for example, a hexagonal shape) in plan view. The second shaft portion 216b is covered with the fitting portion 215b and the annular portion 215c of the housing 215.

  Here, the main body 215a of the housing 215 of this embodiment constitutes a main body 241 corresponding to the main body 141 of the second embodiment. In addition, the portion of the fitting portion 215b and the second shaft portion 216b that is covered with the fitting portion 215b and the third shaft portion (screw portion) 216c serve as the fixing portion 242 corresponding to the fixing portion 142 of the second embodiment. It is composed.

  Further, an annular spacer 80 is disposed on the radially inner side of the seal member 206 sandwiched between the casing 215 and the wing member 205. The spacer 80 is provided between the fitting portion 215 b and the fluororesin member 61 in the radial direction. In the present embodiment, the spacer 80 is made of a material having a smaller compressive deformation rate with respect to compressive stress than the fluorine-based resin member 61, and is made of, for example, metal. The spacer 80 is formed with a key groove portion 80a with which the key portion 215e of the fitting portion 215b is engaged. The key groove portion 80a is formed by recessing a part of the inner side surface of the spacer 80 radially outward and extends in the axial direction.

  In order to prevent the glass layer GL coated on the main body portion 241 from coming into contact with the metal spacer 80 and damaging the glass layer GL, in this embodiment, the outer surface of the main body portion 241 is in contact with the spacer 80. The part other than the surface is glass-lined. Other configurations are the same as those in the second embodiment. Below, with reference to FIG. 5 and 7, the structure and procedure for attaching the blade member 205 in this embodiment to the stirring shaft 204 are demonstrated.

  FIG. 7 is an enlarged view between the shaft insertion port 22b of the stirring tank 2 and the electric motor 9 in the stirring device 100 provided with the stirring blade 203 of the present embodiment. As shown in FIGS. 5 and 7, the upper end portion of the stirring shaft 204 is fixed to the electric motor 9 via the mounting member 17. The attachment member 17 has an upper attachment member 18 and a lower attachment member 19. The upper mounting member 18 and the lower mounting member 19 are fastened by a fastening member 20 (for example, a bolt and a nut). The upper mounting member 18 has a cylindrical tube portion 18a and a disk portion 18b having a larger outer dimension than the tube portion 18a. The output shaft 9a of the electric motor 9 is inserted into the cylindrical portion 18a. In the present embodiment, the output shaft 9a is made non-rotatable with respect to the cylinder portion 18a by engaging the cylinder portion 18a with the key structure. Further, a through hole (not shown) through which the bolt of the fastening member 20 passes is formed in the disc portion 18b.

  The lower mounting member 19 includes a cylindrical portion 19a and a disc portion 19b having a larger outer diameter than the cylindrical portion 19a. The upper end portion of the stirring shaft 204 is inserted into the cylindrical portion 19a. A male screw is formed at the upper end of the stirring shaft 204 (the housing 215), and a screw hole including a female screw that is fastened to the male screw of the stirring shaft 204 is formed at the lower end of the cylindrical portion 19a. The cylinder portion 19a and the upper end portion of the stirring shaft 204 are screwed together. Thereby, the cylinder part 19a is being fixed with respect to the housing | casing 215 in the rotation direction and the up-down direction. In addition, after screwing the cylinder part 19a and the upper end part of the stirring shaft 204, you may insert a set screw from the left-right direction further to the fixing part of the cylinder part 19a and the upper end part of the stirring shaft 204. Thereby, even if the electric motor 9 rotates in the direction of loosening the screw fastening between the cylindrical portion 19a and the upper end portion of the stirring shaft 204, the cylindrical portion 19a can be prevented from rotating with respect to the housing 215.

  And the through-hole (not shown) which the volt | bolt of the fastening member 20 penetrates is formed in the disc part 19b similarly to the disc part 18b. The lower mounting member 19 is fixed to the upper mounting member 18 by fastening the disk portion 18 b and the disk portion 19 b with the fastening member 20.

  In addition, a substantially rectangular opening 19c is formed on the outer surface of the cylindrical portion 19a in a side view. When the upper end portion of the stirring shaft 204 is inserted into the cylindrical portion 19a, the opening 19c is positioned slightly above the protruding portion 216d of the lifting shaft 216 in the vertical direction. Here, the vertical dimension of the opening 19c is set to such a size that the tool 50 (in this embodiment, a ratchet wrench) that fits into the protrusion 216d can be inserted. By rotating the ratchet wrench 50 fitted to the protrusion 216d around the vertical axis J2, the boss 251 of the wing member 205 is fastened to the screw 216c of the lifting shaft 216. The circumferential direction dimension of the opening 19c is set corresponding to the rotation range of the ratchet wrench 50 necessary for fastening the boss portion 251 to the screw portion 216c.

  When attaching the blade member 205 to the stirring shaft 204, first, the upper end portion of the stirring shaft 204 is fixed to the electric motor 9 via the attachment member 17. Then, the key portion 215e of the housing 215 is engaged with the key groove portion 80a of the spacer 80, and the fluororesin member 61 is attached to the stirring shaft 204 so that the first O-ring 62 contacts the lower end surface 241a of the main body portion 241. Install. Next, the wing member 205 is attached to the casing 215 by engaging the key portion 215 e of the casing 215 with the key groove 251 g of the boss 251 of the wing member 205. As a result, the casing 215 cannot rotate with respect to the wing member 205.

  Thereafter, the ratchet wrench 50 is inserted into the lower mounting member 19 through the opening 19c. A socket 50a corresponding to the shape of the protrusion 216d is attached to the ratchet wrench 50. By fitting the socket 50a to the protrusion 216d and rotating the ratchet wrench 50 about the vertical axis J2, the female screw 72 of the boss portion 251 is screwed into the male screw 71 of the screw portion 216c of the lifting shaft 216. The boss portion 251 is fixed to the third shaft portion (screw portion) 216c of the lifting shaft 216 so that the wing member 205 is pulled upward. At this time, since the boss portion 251 and the housing 215 are previously engaged by the key structure, it is necessary to support the blade plate portion 52 of the wing member 205 so that the wing member 205 does not rotate together with the suspension shaft 216. There is no.

  Next, a configuration and procedure for removing the blade member 205 from the stirring shaft 204 will be described. As shown in FIG. 7, the stirring shaft 204 is sealed by a sealing member 31 (for example, a mechanical seal) inside a seal case 30 provided above the shaft insertion port 22b.

  A spacer member 25 is provided between the seal case 30 and the shaft insertion port 22 b of the stirring tank 2. The spacer member 25 is a substantially annular member, and a through hole through which the stirring shaft 204 passes is formed. The spacer member 25 is fixed to the seal case 30 by a fastening member 26 (for example, a bolt and a nut). The spacer member 25 is fixed to the seal case 30 and the shaft insertion port 22b by a fastening member 27 (for example, a bolt and a nut). Further, the spacer member 25 is fixed to a support member 35 that supports the sealing member 31 inside the seal case 30 from below. The support member 35 is a substantially annular member made of resin, for example.

  Here, there is a possibility that the content liquid adheres to the portion of the outer peripheral surface of the stirring shaft 204 that penetrates the spacer member 25. In order to prevent the spacer member 25 from being corroded by the content liquid, the inner peripheral surface, the upper surface and the lower surface of the spacer member 25 are partially subjected to glass lining treatment. Specifically, a glass lining process is performed on the entire inner peripheral surface of the spacer member 25, a portion of the upper surface facing the support member 35, and a portion of the lower surface facing the shaft insertion port 22b.

  Gaskets 36 for closing gaps between the glass lining surface on the upper surface of the spacer member 25 and the lower surface of the support member 35, and between the glass lining surface on the lower surface of the spacer member 25 and the upper surface of the shaft insertion port 22b, respectively. 37 is interposed. In addition, the process which coat | covers the material which has not only a glass lining process but corrosion resistance on the upper surface and lower surface of the spacer member 25 may be performed.

  The lower end portion 11a of the gantry 11 that supports the electric motor 9 from below is fixed to a cylindrical portion 22c provided on the upper wall 22 of the stirring tank 2 by bolts 45 and nuts 46a to 46d. The bolt 45 is a so-called cutting bolt that does not have a head. The cylindrical portion 22c has a screw hole 22d in which a female screw to be fastened with a male screw of the bolt 45 is formed. And the 1st nut 46a is contact | abutting on the upper surface of the cylindrical part 22c to which the volt | bolt 45 is fastened.

  The second nut 46b is in contact with the upper surface of the lower end portion 11a of the mount 11 through which the bolt 45 is inserted, and the third nut 46c is in contact with the lower surface of the lower end portion 11a. Furthermore, the 4th nut 46d is contact | abutted in the surface on the opposite side to the contact surface with the lower end part 11a among the 3rd nuts 46c. The lower end 11a of the gantry 11 is fixed to the spacer member 25 by a fastening member 47 (for example, a bolt and a nut).

  When removing the blade member 205 from the stirring shaft 204, in order to prevent the blade member 205 from coming into contact with the bottom wall of the stirring tank 2, in this embodiment, the blade member 205 is removed after the stirring shaft 204 is pulled upward. . Specifically, the stirring shaft 204 is pulled upward by moving the gantry 11 supporting the electric motor 9 to which the upper end portion of the stirring shaft 204 is fixed upward. Here, by moving the fastening position of the second nut 46 b and the third nut 46 c with respect to the bolt 45 upward, the gantry 11 can be moved upward with respect to the upper wall 22. That is, by changing the fastening position between the bolt 45 and the nuts 46b and 46c, the stirring shaft 204 can be displaced relative to the stirring tank 2 in the vertical direction.

  Further, when the stirring shaft 204 is pulled upward, in order to maintain the sealing position of the sealing member 31 with respect to the stirring shaft 204, the sealing case 30 that houses the sealing member 31 and the support member 35 that supports the sealing member 31. Is also pulled upward together with the stirring shaft 204. Since the seal case 30 is fixed to the shaft insertion port 22b with bolts 27a and nuts 27b, the nut 27b is loosened when the gantry 11 is moved upward.

  After loosening the nut 27b, the second nut 46b fastened to the bolt 45 is loosened to move the lower end 11a of the gantry 11 upward. Then, after setting the lower end portion 11a of the gantry 11 to a desired position, the third nut 46c is brought into contact with the lower surface of the lower end portion 11a, and the second nut 46b is brought into contact with the upper surface of the lower end portion 11a. The fastening position between the bolt 45 and the nuts 46b and 46c is determined.

  When the gantry 11 is moved upward, the spacer member 25 fixed to the gantry 11 with the fastening member 47 is also moved upward. Since the spacer member 25 is fixed by the seal case 30 and the fastening member 26, the seal case 30 also moves upward in response to the movement of the spacer member 25. Since the spacer member 25 is also fixed to the support member 35 that supports the sealing member 31 from below as described above, the support member 35 also moves upward in accordance with the movement of the spacer member 25. Accordingly, the stirring shaft 204 can be pulled upward while maintaining the sealing position of the sealing member 31 with respect to the stirring shaft 204. Therefore, even when the stirring shaft 204 is moved upward in the removal operation of the blade member 205, it is not necessary to perform the sealing operation on the stirring shaft 204 again, and workability can be improved.

  After the stirring shaft 204 is lifted upward, the ratchet wrench 50 fitted to the protrusion 216d is rotated in the opposite direction to that at the time of attachment, and the male screw 71 of the screw portion 216c and the female screw 72 of the boss portion 251 are rotated. By loosening the fastening state, the suspension shaft 216 is removed from the wing member 205 (see FIG. 5). At this time, since the boss portion 251 and the housing 215 are previously engaged by the key structure, it is necessary to support the blade plate portion 52 of the wing member 205 so that the wing member 205 does not rotate together with the suspension shaft 216. There is no. Thereafter, the wing member 205 is detached from the stirring shaft 204 by removing the boss 251 from the housing 215.

  According to the configuration described above, as in the first and second embodiments, the female screw 72 of the boss portion 251 is fastened to the male screw 71 of the third shaft portion (screw portion) 216c. Can be attached to and detached from the agitation shaft 204 by screw fixing, and workability is improved.

  Further, when the third shaft portion (screw portion) 216c of the lifting shaft 216 is screwed to the boss portion 251 of the wing member 205, the fitting portion 215b of the housing 215 is fitted to the boss portion 251 and cannot rotate. Therefore, it is not necessary to support the blade part 52 in order to prevent the wing member 205 from rotating together with the suspension shaft 216, and workability can be improved. Further, since the torque load generated when the agitating blade 203 is fixed to the electric motor 9 and rotated for the agitating process is also borne in the fitting portion between the boss portion 251 and the housing 215, the male screw It is possible to prevent an excessive torque load from acting on the screw fastening portion between the female screw 71 and the female screw 72, and a good fastening state is realized.

  Further, the torque load generated when the stirring blade 203 is rotated is also borne in the fitting portion between the boss portion 251 and the housing 215, so that the strength at the screw fastening portion between the female screw 72 and the male screw 71 is increased. The demand can be relaxed. Thereby, the outer diameter of the 3rd axial part (screw part) 216c of the lifting shaft 216 in this embodiment is larger than the outer diameter of the 3rd axial part (screw part) 16c of the lifting shaft 16 in 2nd Embodiment. Can be small.

  In the present embodiment, since the casing 215 is engaged with the boss portion 251 of the blade member 205 by the key structure, the torque load generated when the stirring blade 203 rotates can be coupled to the boss portion 251 and the housing with a simple configuration. The burden can also be imposed on the fitting portion with the body 215.

  In addition, since the metal spacer 80 having a smaller compressive deformation rate than the fluorine resin member 61 is provided between the fitting portion 215b and the fluorine resin member 61, the plastic resin is plastically deformed. It is possible to prevent the member 61 from coming into close contact with the fitting portion 215b and preventing the fluororesin member 61 from coming off easily. Therefore, workability at the time of maintenance of the stirring blade 203 can be improved, for example, by replacing the O-rings 62 and 63 fitted in the grooves 61 a and 61 b of the fluorine-based resin member 61. The spacer 80 is not limited to a metal member, and may be a resin member as long as the compressive deformation rate is smaller than that of the fluorine resin member 61.

  In addition, this invention is not limited to embodiment mentioned above, The structure can be changed, added or deleted in the range which does not deviate from the meaning of this invention. The shape and configuration of the stirring shafts 4, 14, 204 are not limited to the shape and configuration described in the above-described embodiment. For example, the main body portions 41, 141, 241 have a shape in which the outer diameter increases in the vertical direction as a portion near the lower end surfaces 41a, 141a, 241a extends downward. The outer diameter may be the same from the upper end to the lower end. In the above-described embodiment, the second fixing portion 42b has a substantially cylindrical shape, but may have a rectangular parallelepiped shape. Moreover, in the above-mentioned embodiment, although the convex parts 42c and 142c were cyclic | annular, it is not restricted to this, For example, from a part of lower part of the 2nd fixing | fixed part 42b (protrusion part 15b), the 1st fixing | fixed part 42a ( The third shaft portion 16c) may partially protrude outward in the radial direction.

3,13,203 Stirring blade 4,14,204 Stirring shaft 5,205 Wing member 6,206 Seal member 15,215 Housing 16,216 Suspended upper shaft 16c, 216c Screw portion 41,141,241 Main body portion 41a, 141a , 241a Lower end surface 42, 142, 242 Fixed portion 42c Protruding portion 42ca Lower end surface 51,251 Boss portion 51a Upper end surface 51b Screw hole 51c Recessed portion 51ca Abutting surface 61 Fluorine resin member 61a Upper groove portion 61b Lower groove portion 62 1O Ring 63 2nd O-ring 71 Male thread 72 Female thread 215b Fitting portion S space

Claims (5)

A main body part subjected to glass lining treatment on the outer surface, a fixing part protruding from the lower end surface of the main body part, and a stirring shaft extending in the vertical direction inside the stirring tank;
A glass lining treatment is applied to the upper end surface facing the lower end surface of the main body portion with an interval in the vertical direction, and a wing member having a boss portion detachable from the fixed portion,
A resin-made sealing member disposed between the lower end surface of the main body portion and the upper end surface of the boss portion and having corrosion resistance,
The fixing part is formed with a male screw on the outer surface not subjected to a glass lining treatment,
The boss portion opens downward from the upper end surface, and has a screw hole in which a female screw is formed on an inner peripheral surface not subjected to a glass lining treatment,
The stirring blade, wherein the female screw is fastened to the male screw, whereby the seal member is sandwiched between the lower end surface of the main body portion and the upper end surface of the boss portion. The seal member is a fluorine containing an annular upper groove formed on a surface facing the lower end surface of the main body and an annular lower groove formed on a surface facing the upper end surface of the boss portion. A system resin member, a first O-ring fitted into the upper groove, and a second O-ring fitted into the lower groove,
The said 1st O-ring press-contacts to the said lower end surface of the said main-body part, and the said 2nd O-ring press-contacts to the said upper end surface of the said boss | hub part by fastening the said internal thread to the said external thread. The stirring blade according to 1. The fixing portion further includes a convex portion that protrudes radially outward from the upper side of the male screw and whose tip is positioned radially inward from the outer peripheral edge of the lower end surface of the main body portion,
The boss part is recessed from the upper side of the female screw to the radially outer side, and has a concave part formed with a contact surface facing the lower end surface of the convex part in the vertical direction,
The clearance between the lower end surface of the main body portion and the upper end surface of the boss portion is such that the contact surface of the concave portion is in contact with the lower end surface of the convex portion, and the compression deformation of the seal member is performed. The stirring blade according to claim 1, wherein the stirring blade is set to a size maintained in the elastic region.   The agitation shaft includes a suspension shaft including a screw portion in which the male screw is formed, and a housing including the main body portion in which a space through which the suspension shaft is inserted is relatively rotatable. Item 4. The stirring blade according to any one of Items 1 to 3.   The stirring blade according to claim 4, wherein the casing further includes a fitting portion that fits into the boss portion so as not to rotate with respect to the blade member.

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