JP7278029B2 - Shaft sealing member, shaft sealing device for rotating shaft, horizontal mixer and mixer - Google Patents

Description

The present invention provides a shaft sealing member for preventing leakage of contents inside the casing from leaking outside from a gap between the rotating shaft and the casing where the rotating shaft is driven to pass through the casing. The present invention relates to a shaft sealing device, a horizontal mixer having the shaft sealing device, and a mixer.

2. Description of the Related Art Conventionally, a gland packing system is mainly used for a shaft sealing device used in a horizontal mixer suitable for food.
However, this gland packing type shaft sealing device has a large number of parts and a complicated structure.

For example, in the shaft sealing device for a food mixer disclosed in Japanese Unexamined Patent Application Publication No. 2010-41970, as shown in FIG. Further, the outer diameter portion of the gland packing 110 is fitted inside the annular housing 9, and the inner diameter portion of the gland packing 110 is provided around the small diameter portion 15 of the shaft 1. .

When the shaft sealing device having such a structure is cleaned, the nut 26 is rotated and loosened as shown in FIG. It is to be taken out. Therefore, the annular cap 19 can be moved to the outside of the tank 3 and pulled out from the through hole 8. However, as described above, the attachment and detachment of the gland packing 110 is difficult to handle, and the structure is complicated. Therefore, it is not easy to disassemble for cleaning, and furthermore, there are drawbacks such as an increase in the cost of the device.

Japanese Unexamined Patent Application Publication No. 2010-41970

2. Description of the Related Art Conventionally, for example, a gland packing system is mainly used for shaft sealing devices used in horizontal mixers. This gland packing type shaft sealing device has drawbacks such as difficulty in dismantling for cleaning, a large number of parts, and a complicated structure. Therefore, there has been a demand for a shaft sealing device for a rotating shaft that is simple in structure, extremely easy to disassemble, and easy to clean or replace the sealing member.

SUMMARY OF THE INVENTION One object of the present invention has been made in view of these problems, and it is an object of the present invention to provide a rotary shaft having a simple structure, a small number of parts, and easy maintenance at a portion where the rotating shaft penetrates the casing. A shaft sealing device and a horizontal mixer are provided.
Another object of the present invention is to provide a shaft sealing member and a mixer that can restrict movement of a contained object between a rotating shaft and a casing through which the rotating shaft passes.

A first aspect of a shaft sealing device for a rotary shaft according to the present invention includes a casing having a contained object therein, a rotary shaft provided penetrating the casing and driven to rotate, and a rotary shaft penetrating to the outside of the casing. A two-part seal ring arranged around a protruding rotating shaft and having an outer peripheral portion detachably fitted into the casing; and a sealing groove formed in the inner peripheral portion of the seal ring and facing the rotating shaft. , and a two-part holding plate detachably supported on the outer end of the seal ring.

In a second aspect of the shaft sealing device for a rotary shaft according to the present invention, the means for attaching and detaching the two-part seal ring and the two-part presser plate is implemented through a plurality of fixing pins fixed to the casing. The shaft sealing device for a rotating shaft according to the first aspect has the advantage that the seal ring can be attached and detached very easily during cleaning or replacement of the seal ring.

A third aspect of the shaft sealing device for a rotary shaft according to the present invention is the first sealing device, wherein the seams of the split portions of the two-split seal ring and the two-split retainer plate are arranged on non-collinear lines. The rotary shaft sealing device according to the above aspect or the second aspect has the advantage of being able to more reliably seal leakage of contents from the casing.

A first aspect of a horizontal mixer according to the present invention includes a casing having a contained object therein, a rotating shaft provided through the casing and driven to rotate, and a rotating shaft protruding through the casing to the outside. A two-part seal ring arranged around a shaft and having an outer peripheral portion detachably fitted into the casing, a sealing groove formed in the inner peripheral portion of the seal ring and facing the rotating shaft, and the seal ring. a shaft sealing device for a rotary shaft comprising a two-part pressing plate detachably supported on the outer end of the casing; a bearing unit for rotatably supporting the rotary shaft in the casing; In the horizontal mixer provided with a stirring means, the seal ring can be attached and detached very easily during cleaning or replacement work of the seal ring, and cleaning is easy because the seal ring structure is divided into two parts. It has the advantage of being reliable and easy.

In a second aspect of the horizontal mixer according to the present invention, the means for attaching and detaching the two-split seal ring and the two-split presser plate is implemented through a plurality of fixing pins fixed to the casing. In a horizontal mixer having a shaft sealing device, the seal ring can be attached and detached very easily during cleaning or replacement of the seal ring, and since the seal ring structure is divided into two parts, cleaning is ensured. Moreover, it has the advantage of being easily performed.

A third aspect of the horizontal mixer according to the present invention is a shaft sealing device for a rotary shaft, wherein joints of the split portions of the two-split seal ring and the two-split presser plate are arranged on non-collinear lines. This horizontal mixer has the advantage of being able to more reliably seal against leakage of contents from the casing.

A first aspect of the shaft sealing member of the present invention is a shaft sealing member that restricts movement of a contained object between a rotating shaft and a casing through which the rotating shaft penetrates,
A seal ring member disposed on one of the rotating shaft and the casing,
A helical groove is provided in one of the inner and outer surfaces of the seal ring member, which faces one of the inner and outer surfaces of the other of the rotating shaft and the casing.

A second aspect of the shaft sealing member of the present invention is the shaft sealing member according to the first aspect, wherein the helical direction of the grooves coincides with the direction of rotation of the rotating shaft.

A third aspect of the shaft sealing member of the present invention is the shaft sealing member according to the first or second aspect, comprising a plurality of the seal ring members, wherein the plurality of seal ring members are attached to the rotary shaft. It is removably mounted along the central axis.
It has advantages.

A first aspect of the mixer of the present invention includes a casing capable of accommodating a content,
a rotating shaft rotatable within the casing and penetrating the casing;
an agitating member connected to the rotating shaft for agitating the content;
and a shaft sealing member according to one of the first to third aspects.

In this specification, the "shaft sealing member" is a member for restricting the movement of the contents in the casing to the outside of the casing from the area between the rotating shaft and the casing through which the rotating shaft penetrates. means Further, in this specification, the term "rotating shaft sealing device" includes a casing, a rotating shaft penetrating the casing, a two-part seal ring detachably fitted into the casing, and a seal ring inside the seal ring. It means a device comprising a sealing groove formed on the circumference and a two-part pressing plate detachably attached to the two-part seal ring. Furthermore, in this specification, the term "half member" means not only each member when one part is composed of two members, but also when one part is composed of three or more members. means each member of

According to one aspect of the shaft sealing device for a rotary shaft according to the present invention, the seal ring and the presser plate have a divided structure, so the seal ring and the presser plate can be easily attached and detached from the rotary shaft even if the space in the direction of the rotating shaft is small. There is an advantage in that it is easy and the work of cleaning or exchanging the seal ring is easy. Further, according to one aspect of the shaft sealing device for a rotary shaft according to the present invention, there are advantages that the number of parts can be reduced, the cost of the device can be reduced, and maintenance work can be facilitated.

Further, in one aspect of the mixer having one aspect of the above-described shaft sealing device for the rotating shaft, the seal ring can be easily attached and detached even if the space between the shaft sealing device and the structure supporting the rotating shaft is narrow. , also has the advantage that it is easy to clean or replace the seal ring.

According to one aspect of the shaft sealing member or the mixer of the present invention, it is possible to restrict the movement of the contents between the rotating shaft and the casing through which the rotating shaft penetrates.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical view showing a cutaway configuration of a main part of a horizontal mixer using a shaft sealing device for a rotating shaft according to a first embodiment of the present invention; FIG. 2 is a longitudinal sectional view showing an enlarged shaft sealing device for a rotating shaft showing a part of FIG. 1; 3 is an enlarged front view showing a fixing pin 30 shown in FIG. 2; FIG. 3 is a plan view showing a two-part seal ring taken out from the shaft sealing device for the rotating shaft of FIG. 2; FIG. 3] is a plan view showing a two-part pressing plate taken out from the shaft sealing device of the rotating shaft of FIG. 2. [FIG. 3 is a plan view showing an attached state of a two-part seal ring and a two-part pressing plate relating to the shaft sealing device for the rotating shaft of FIG. 2; FIG. 3 is a plan view showing a state in which the two-split presser plate is removed in order to release the assembled state of the two-split presser plate and remove the two-split seal ring from the shaft sealing device of FIG. 2; FIG. (a) is a plan view of a two-part seal ring arranged on the right side of a rotating shaft 12 according to a second embodiment of the present invention, and (b) is a half member of the two-part seal ring. 8(c) is an enlarged schematic diagram schematically showing a portion indicated by an arrow VIIIc in FIG. 8(b). (a) is a plan view of a two-piece seal ring arranged on the left side of a rotating shaft according to a second embodiment of the present invention; (b) is a half member of the two-piece seal ring; It is a front view, (c) is an enlarged schematic diagram which represents typically the site|part which the arrow IXc of FIG.9(b) shows. (a) is a schematic plan view of the horizontal mixer 1, (b) is a schematic partially broken front view of the horizontal mixer 1 shown in FIG. 1 is a schematic side view of the horizontal mixer 1 shown in FIG. 1 is a vertical cross-sectional view showing a main part of a food mixer using a conventional rotary shaft sealing device; FIG.

In the following description, the same configurations are denoted by the same reference numerals, and the description thereof will be omitted or simplified.
[First embodiment]
A shaft sealing device for a rotating shaft according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 7. FIG.

FIG. 1 is a schematic vertical cross-sectional view showing the configuration of a main part of a horizontal mixer 1 provided with a shaft sealing device for a rotating shaft according to this embodiment.
That is, a container 10 is accommodated inside a tank (hereinafter referred to as a casing) 11 that constitutes the horizontal mixer 1 . A rotary shaft 12 that is rotationally driven is supported by the casing 11 by a driven shaft side bearing unit 20 and a driven shaft side bearing unit (not shown). A frame 21 that supports the casing 11 and the bearing unit 20 is arranged at the tip of the driven shaft side bearing unit 20 . The frame 21 is also arranged on the driven shaft side bearing unit side (not shown). A plurality of agitators (hereinafter referred to as agitation rods) 17 and 18, which are agitators for agitating the food, are mounted in the casing 11. As shown in FIG.

A rotating shaft 12 is arranged around a rotating shaft 12 protruding through the casing 11 so as to be separated from an outer peripheral surface 12a of the rotating shaft 12 by a predetermined distance, and the outer peripheral portion 2 is detachably fitted in the casing 11. Split type seal rings 13 a and 13 b (that is, shaft sealing members) are attached to a plurality of fixing pins 30 fixed to the casing 11 so as to be freely fitted. For example, a plurality of annular grooves 14 are formed as grooves for sealing in portions of the seal rings 13a and 13b facing the outer peripheral surface 12a of the rotating shaft 12. As shown in FIG. This annular groove 14 acts as a so-called labyrinth groove to seal the contents 10 in the casing.

At the outer ends of the seal rings 13a and 13b, two-part pressing plates 15a and 15b detachably supported by the fixing pin 30 are attached.
As shown in FIG. 4, the two-part seal rings 13a and 13b are configured to form a circle with two semi-circular seal rings 13a and 13b made of resin. When the seal rings 13a and 13b are attached to the fixing pin 30, the joints thereof are arranged at a position deviated from the center line by minus 60 degrees, as shown in the figure. Each of the seal rings 13a and 13b is provided with three through holes 13c at symmetrical positions, for a total of six through holes 13c. The fixing pins 30 are fitted into these through holes 13c. The shape of this fixing pin 30 is illustrated in FIG. That is, a screw portion 30a to be screwed into the casing 11, a shaft portion 30b to be inserted into the through holes 13c of the seal rings 13a and 13b shown in FIG. It consists of a shaft portion 30c fitted into the shown through hole 15c and a head portion 30d.

Further, two-part pressing plates 15a and 15b shown in FIG. 5 are fitted on the seal rings 13a and 13b and fitted to the fixing pin 30 in a combined state. Although the holding plates 15a and 15b are shown separated in FIGS. 5 and 7, when they are attached to the fixing pin 30, the straight portions of the semicircular shape are aligned with each other as shown in FIG. Assembled to form a circle.
At this time, as shown in FIG. 4, the seam of the seal rings 13a and 13b is shifted 30° + 30° = 60° minus from the center line YY axis that is the top and bottom in the positional relationship of top and bottom. placed in In addition, depending on the characteristics of the contents, it is also possible to arrange the seams of the seal rings 13a and 13b on the center line YY axis, which is the top and bottom in FIG. If it is necessary to improve the outflow prevention performance in order to correspond to the characteristics of the contents, it is preferable to shift the seam between the seal rings 13a and 13b and the center line YY axis. When the seams of the seal rings 13a and 13b are arranged at plus or minus 90 degrees (horizontal direction) with respect to the center line YY axis, the outflow prevention performance of the contents can be most enhanced.

On the other hand, as shown in FIG. 5, each of the pressing plates 15a and 15b is provided with three through holes 15c for inserting fixing pins. This through hole 15c forms an elongated hole having a large diameter. Further, the presser plate 15a is provided with a small hole 15e for attaching the engaging part 22a of the catch clip 22, as shown in FIG. A small hole 15f for attaching the clip part 22b of the catch clip 22 is provided in the pressing plate 15b.

FIG. 1 shows how the two-part seal rings 13a and 13b and the two-part presser plates 15a and 15b are attached when the horizontal mixer is in operation. FIG. 5 shows this state. That is, the two-part seal rings 13a and 13b are assembled into a flanged cylindrical shape by assembling the semicircular seal rings 13a and 13b in the arrangement relationship shown in FIG. At this time, a plurality of annular grooves are formed on the inner peripheral surface as grooves for sealing to face the rotary shaft 12 and have a sealing effect. Two-part pressing plates 15a and 15b shown in FIG. 7 are pressed against the outer end faces of the two-part seal rings 13a and 13b. A catch clip 22 is attached to the holding plates 15a and 15b so as to form a circular shape by integrating the holding plates 15a and 15b by elastic force.

Therefore, the seams of the center portions of the two-part seal rings 13a and 13b that are combined as described above are not on the same line as the seams of the center portions of the two-part press plates 15a and 15b that are combined. Since the eyes are offset, it has the effect of increasing the sealing effect of the contents of the mixer.

Next, a procedure for removing the seal rings 13a and 13b from the shaft sealing device of the rotating shaft when the horizontal mixer is stationary in order to clean or replace the seal rings 13a and 13b will be described.
FIG. 2 shows a state in which the shaft sealing device of the rotating shaft of the horizontal mixer 1 is disassembled and the seal rings 13a and 13b are taken out.

First, as shown in FIG. 7, both parts 22a and 22b are separated in order to release the tightening state between the engaging part part 22a and the clip part 22b. Thereafter, the pressing plates 15a and 15b are removed from the rotary shaft 12 by pulling the handles 15d and 15d sideways and then forward. Then, the two-part seal rings 13a and 13b are removed from the rotating shaft 12. As shown in FIG. In this way, each sealing ring 13a, 13b can be individually cleaned or simply replaced with a new sealing ring 13a, 13b.

As described above, in the shaft sealing device of the rotary shaft and the horizontal mixer having the shaft sealing device in the first embodiment of the present invention, the seal ring can be attached and detached very easily. The seal ring can be easily attached and detached even if the space between the bearing unit and the structure supporting the is narrow.

[Second embodiment]
A shaft sealing device for a rotating shaft according to a second embodiment of the present invention will now be described with reference to FIGS. 8 to 10. FIG. The shaft sealing members for the rotary shafts according to the first and second embodiments are the same except that the structures of the two-part seal rings 114 and 113, which are the shaft sealing members, are different. Therefore, the configuration of the two-part seal ring 113 will be mainly described below. Further, components and their effects of the rotary shaft sealing device according to the second embodiment, which are not specified, are the same as those of the rotary shaft sealing device according to the first embodiment.

FIG. 8(a) is a plan view of a two-part seal ring 114 arranged on the right side of the rotary shaft 12 according to the second embodiment of the present invention, and FIG. 8(b) is a two-part seal ring. FIG. 8C is a front view of a half member 114b of the seal ring 114, FIG. 8C is an enlarged schematic diagram schematically showing a portion indicated by an arrow VIIIc in FIG. FIG. 9B is a plan view of a two-part seal ring 113 arranged on the left side of the rotating shaft 12 according to the second embodiment of the invention, FIG. It is a front view, and FIG.9(c) is an enlarged schematic diagram which represents typically the site|part which the arrow IXc of FIG.9(b) shows. 10(a) is a schematic plan view of the horizontal mixer 1, FIG. 10(b) is a schematic partially broken front view of the horizontal mixer 1 shown in FIG. 10(a), and FIG. 10(a) is a schematic side view of the horizontal mixer 1 shown in FIG. 10(a); FIG. The configuration of the horizontal mixer 1 shown in FIGS. 10(a) to 10(c) is the same as that of the horizontal mixer 1 shown in FIG. 1, except for items to be noted.

The two-part seal ring 114 shown in FIGS. 8(a) and 8(b) is mounted on the right side of the rotating shaft 12 of the horizontal mixer 1 shown in FIG. 10, and is shown in FIGS. The two-part seal ring 113 shown in FIG. 10 is mounted on the right side of the rotary shaft 12 of the horizontal mixer 1 shown in FIG. 10 and has a symmetrical shape. Therefore, the configuration of the two-part seal ring 114 shown in FIGS. 8(a) and 8(b) will be described. The through-hole 114c shown in FIG. 8B and the through-hole 114c shown in FIG. 8A are shown in different positions with respect to the central axis X direction. The purpose of FIG. 8B is to clearly show the distance from the outer circular arc surface 116a to the through hole 114c.

The two-part seal ring 114 is a cylindrical member, and has a left half that is bilaterally symmetrical with respect to an imaginary plane passing through the central axis X passing through its center (except for a sealing groove 116c, which will be described later). It is composed of a member 114a and a right half member 114b. Half member 114 b has a base 116 with a sealing groove 116 c and a flange 117 extending to the end of base 116 . The base portion 116 has an outer peripheral arcuate surface 116a with a predetermined dimension, and an end surface 116b at the right end in FIG. 8B having a radius of curvature smaller than that of the outer peripheral arcuate surface 116a. A flange portion 117 is provided on the left side of the outer circumferential arc surface 116a in FIG. 8(b). The flange portion 117 is provided with a plurality of through holes 114c extending parallel to the rotation axis O direction and penetrating therethrough. In this embodiment, three circular through-holes 114c are provided, but the shape and dimensions can be changed as appropriate.

Furthermore, a spiral sealing groove 116c is engraved on the inner peripheral arcuate surface of the base portion 116. As shown in FIG. As shown in FIG. 8(c), the closed groove 116c includes a recess 116d having a predetermined curvature radius and a recess 116d extending parallel to the rotation axis O direction and having a predetermined curvature radius and adjacent to the recess 116d. and a top portion 116e connecting the .

On the other hand, the half member 114a of the two-piece seal ring 114 shown on the left side of FIG. 8(a) has a line-symmetrical shape with respect to the half member 114b along the center axis X except for the sealing groove 116c. That is, when the half member 114a and the half member 114b are engaged as shown in FIG. 8(a), the closed groove 116c of the half member 114a and the closed groove 116c of the half member 114b are continuous and form a series of spirals. configure. The closed grooves 116c of the half members 114a and 114b extend continuously on the inner peripheral surface of the base portion 116 from the flange portion 117 side to the right in the direction of the rotation axis O in FIG. 8(b). Furthermore, the recessed portion 116d of the closed groove 116c has a helical shape forming a right-handed internal thread extending clockwise (rightward).

On the other hand, the half members 113a and 113b of the two-part seal ring 113 shown in FIGS. , 114b have the same size and shape, except that they have a closed groove 115c that differs in shape from the closed groove 116c of 114b. When the halves 113a, 113b are engaged as shown in FIG. 9(a), the blocked grooves 115c of half-member 113a and the blocked grooves 115c of half-member 113b are continuous and form a series of spirals. Furthermore, the recessed portion 115d of the closed groove 115c has a helical shape forming a left internal thread extending counterclockwise (counterclockwise).

The two-part seal ring 113 has a through hole 113c, a base portion 115, an end surface 115b, a sealing groove 115c, a concave portion 115d, a top portion 115e, and a flange portion 117.

On the other hand, the half member 113a of the two-piece seal ring 113 shown on the left side of FIG. 9(a) has a shape symmetrical to the half member 113b along the center axis X except for the sealing groove 115c. That is, when the half-member 113a and the half-member 113b are engaged as shown in FIG. 9A, the closed groove 115c of the half-member 113a and the closed groove 115c of the half-member 113b are continuous and form a series of spirals. configure. The closed grooves 115c of the half members 113a and 113b extend continuously on the inner peripheral surface of the base portion 115 from the flange portion 117 side to the right in the direction of the rotation axis O in FIG. 9B. Further, the recessed portion 115d of the closed groove 115c extends counterclockwise (counterclockwise) and has a helical shape forming a left-handed internal thread.

As described above, the closed groove 115c of the two-part seal ring 113 and the closed groove 116c of the two-part seal ring 114 arranged around the rotary shaft 12 (see FIG. 1) are helical shapes having directions different from each other. is formed in Further, in this embodiment, the shape of the sealing grooves 115c and 116c of the two-part seal rings 114 and 113 is set when the rotating shaft 12 rotates in the direction of the arrow T (clockwise) shown in FIG. Therefore, when the rotating shaft 12 rotates in a direction opposite to the direction of the arrow T, the closed groove 115c has a right-handed helical shape, and the closed groove 116c has a left-handed helical shape. By forming the sealing grooves 115c and 116c into a helical shape in this way, the movement of the contents such as bread dough adhering to the outer peripheral surface of the rotating shaft 12 is prevented by the two-part seal rings 114 and 113 having the sealing grooves 115c and 116c. Locked.

The inventors have found through intensive research that when the rotating shaft 12 of the horizontal mixer 1 rotates to knead the dough, the internal pressure inside the container 10 increases relative to the outside of the container 10, and the dough moves along the rotating shaft. 12 and the casing 11 of the horizontal mixer 1 tend to flow out of the horizontal mixer 1 through a minute gap. This embodiment utilizes the Archimedian screw principle to prevent the dough from flowing out.

Specifically, the direction of rotation (arrow T in FIG. 10(c)) of the rotating shaft 12 (see FIG. 1) is the same as the direction in which the spiral of the sealing groove 116c is wound (that is, the spiral direction). I am doing it. Therefore, from the inside of the container 10, through the outer peripheral surface 12a of the rotating shaft 12 (see FIG. 1), the inner peripheral surface 11a of the casing 11 (see FIG. 1), or the space between the outer peripheral surface 12a and the inner peripheral surface 11a. By applying a force in the opposite direction (towards the inside of the casing 11 ) to the contained object 10 flowing outward, a force is applied to move the contained object 10 inside the casing 11 . As a result, even if the contained object 10 moves to the outside of the casing 11 through the minute space between the rotary shaft 12 and the casing 11, the force applied to the contained object by the blocking grooves 116c and 115c causes the horizontal mixer 1 to move. outflow to the outside of the

Furthermore, the sealing groove 115c of the two-part seal ring 113 arranged on the left side of the rotary shaft 12 (left side in FIG. 10(b)) is rotated in the direction of rotation of the rotary shaft 12 (see FIG. 1) ( The arrow T) in c) coincides with the spiral direction of the spiral closed groove 115c. That is, the two-part seal ring 113 has a sealing groove 115c extending in a spiral direction (left direction) opposite to the spiral direction of the sealing groove 116c of the two-part seal ring 114 arranged on the right side.

The two-part seal rings 114 and 113 configured as described above are detachably attached to the fixing pin 30 fixed to the casing 11 via the through hole 113c as in the first embodiment.

Furthermore, on the two-part seal rings 114 and 113, the diameter portions of the two-part press plates 15a and 15b shown in FIG. As described in connection with the first embodiment, the hold-down plates 15a, 15b, shown diametrically spaced apart in FIGS. The straight sections are engaged and assembled to form a circle as shown in FIG.

As in the first embodiment, in the assembly process described above, the seams of the two-part seal rings 114 and 113 are arranged in a positional relationship extending in a direction inclined with respect to the vertical direction (center axis X direction). . By performing performance tests, the inventors have found that the two-part seal rings 114 and 113 of the second embodiment have a higher leakage rate than the two-part seal rings 13a and 13b of the first embodiment. We have obtained the knowledge that the prevention accuracy of Of course, it is also possible to employ a configuration in which the seams extend in the vertical direction, as in the case of the two-part seal rings 13a and 13b of the first embodiment, depending on the characteristics of the contents.

Furthermore, the two-part seal rings 114, 113 and the two-part presser plates 15a, 15b are mounted on the center axis X of the two-part seal rings 114, 113 engaged with each other, as in the first embodiment. The seam along the edge and the seam at the center of the two-part presser plates 15a and 15b that are fixed to each other extend at positions shifted from each other. Of course, as in the case of the first embodiment, depending on the characteristics of the contents, the joint between the two-part seal rings 114 and 113 and the joint between the two-part pressing plates 15a and 15b should be aligned. It is also possible to adopt

The procedure for removing the two-part seal rings 114 and 113 from the rotating shaft 12 when the horizontal mixer 1 is stopped in order to clean or replace the two-part seal rings 114 and 113 is the same as in the first embodiment, so the explanation is omitted. Omit.

In the first embodiment, between the inner peripheral surface 13d of the two-part seal rings 13a, 13b provided with the groove 14 and the outer peripheral surface 12a of the rotating shaft 12, and in the second embodiment, the sealing A gap is provided between the tops 115e and 116e of the grooves 115c and 116c and the outer peripheral surface 12a of the rotating shaft 12. It is adjusted appropriately according to the characteristics.

In the first and second embodiments, a closed groove composed of a single internal thread is employed, but the present invention is not limited to such a closed groove. The closed groove can be composed of one or multiple internal threads, or can be composed of internal threads of various sizes. In addition, in the above-described embodiment, a two-part seal ring having a female screw-shaped sealing groove is used. It is also possible to configure to form Further, by providing a helical convex portion in the shape of a single or multiple threads complementary to the shape of the internal thread on the outer peripheral surface of the rotating shaft 12, the outflow of the contents is prevented in the same manner as in the above-described embodiment. can do. Furthermore, although the present embodiment employs a seal ring or pressure plate composed of two half-members, the present invention employs a single seal ring or pressure plate, or a seal ring or pressure plate composed of three or more half-members. It is also possible to employ a seal ring or a pressure plate.

In addition, even in the above-described configuration in which a seal ring is attached to the rotating shaft and the above-described configuration in which a convex portion is provided on the outer peripheral surface of the rotating shaft 12, a gap is provided between the sealing and the inner peripheral surface of the casing, and A gap is provided between the convex portion and the inner peripheral surface of the casing, and the size of the gap can be appropriately changed as described in paragraph [0052].

Although the first and second embodiments use a horizontal mixer for kneading bread dough, the invention is not limited to horizontal mixers for use with bread dough, but vertical mixers for kneading food or food and liquid mixtures. , spiral mixers, horizontal mixers, and the like.

It goes without saying that the present invention is not limited to the above-described embodiments, and is within the scope of the present invention as long as it is based on the technical idea of the present invention.

1 horizontal mixer 10 mixture (contents)
11 Mixing tank wall (casing) 12 Rotating shaft
13a, 13b Two-part seal ring 13c Through hole 13f Through hole 14 Seal groove 15a, 15b Two-part holding plate 15c Through hole 15d Handle 17, 18 Stirring rod 19 Bearing 20 Driven shaft side bearing unit 21 Frame 22 Catch Clip 22a engagement part part 22b Clip part 30 fixing pin 113, 114 Two-part seal ring
113a, 113b, 114a, 114b Half member 113c, 114c Through hole 115, 116 Base 115c, 116c Sealed groove 115d, 116d Recess 115e, 116e Top 117 Flange

Claims (10)

a casing having a contained object inside; a rotary shaft provided through the casing to be rotationally driven; A two-part seal ring freely fitted, a seal groove formed in the inner peripheral portion of the seal ring and facing the rotating shaft, and two parts detachably supported on the outer end of the seal ring. A shaft sealing device for a rotary shaft, comprising a pressing plate. 2. A shaft sealing device for a rotating shaft according to claim 1, wherein means for attaching and detaching said two-split type seal ring and said two-split presser plate are carried out through a plurality of fixing pins fixed to said casing. 3. A shaft sealing device for a rotating shaft according to claim 1 or 2, wherein joints of the split portions of the seal ring and the pressing plate are arranged on non-collinear lines. a casing having a contained object inside; a rotary shaft provided through the casing to be rotationally driven; A two-part seal ring freely fitted, a seal groove formed in the inner peripheral portion of the seal ring and facing the rotating shaft, and two parts detachably supported on the outer end of the seal ring. A horizontal mixer comprising: a rotary shaft sealing device comprising a pressing plate; a bearing unit for rotatably supporting the rotary shaft in the casing; and stirring means provided on the rotary shaft. 5. A horizontal mixer according to claim 4, wherein means for attaching and detaching said two-part seal ring and said two-part presser plate is a shaft sealing device for said rotating shaft implemented through a plurality of fixing pins fixed to said casing. 6. A horizontal mixer according to claim 4 or 5, wherein the two-part seal ring and the two-part presser plate are joints of the split parts arranged on non-collinear lines to form a rotary shaft sealing device. A shaft sealing member for restricting movement of the contained object between a casing capable of containing the contained object and a rotating shaft rotatable within the casing and capable of penetrating the casing ,
A seal ring member arranged in the casing,
A shaft sealing member , wherein the inner surface of the seal ring member facing the outer surface of the rotating shaft is provided with a helical groove over the entire area. 8. The shaft sealing member according to claim 7, wherein the helical direction of the groove matches the direction in which the rotating shaft rotates. 9. A shaft sealing member according to claim 7, comprising a plurality of said seal ring members, wherein said plurality of seal ring members are detachably attached along the central axis of said rotating shaft. the casing;
the rotating shaft;
an agitating member connected to the rotating shaft for agitating the content;
A mixer comprising the shaft sealing member according to any one of claims 7 to 9.

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