JP4730788B2 - mechanical seal - Google Patents

Description

  The present invention relates to a mechanical seal of a shaft portion, and more particularly to a mechanical seal of a shaft portion disposed so as to pass through a side wall of a casing in a kneading apparatus or the like and protrude outside the casing.

As shown in FIGS. 8 to 9, the kneading apparatus 50 that has been widely used conventionally has a kneading tank (hereinafter referred to as “casing 51”) that contains the kneading material and a rotor drive that penetrates the side wall 52 of the casing 51. The main part is comprised from the rotor R which knead | mixed the kneading | mixing material within the casing 51 provided with the axial part 54 at both ends, and the pressurization lid | cover 55.
When kneading the kneaded material, the kneading device 50 opens the pressure lid 55 and puts the kneaded material into the casing 51, then lowers the pressure lid 55 and connects the motor to the rotor drive shaft portion 54. The kneaded material is kneaded by rotationally driving the rotor R by the driving means.

  By the way, in this kneading apparatus 50, a mechanical seal 60 is provided in order to seal the rotor drive shaft portion 54 that is disposed so as to penetrate the side wall 52 of the casing 51 and project outside the casing 51. .

The mechanical seal 60 fixes a packing presser 62 provided with a packing 61 via a bolt 63 to a packing guide 66 attached to a receiving member 53 provided at a penetrating position of the rotor drive shaft portion 54 of the side wall 52. I was doing.
The mechanical seal 60 tightens the nut 64 to press the packing retainer 62 by the urging force of the spring 65 so that the outer peripheral surface of the packing 61 is in sliding contact with the inner peripheral surface of the packing guide 66. Is pressed against the wear ring plate P (packing receiving member) on the end surface of the flange portion R1 of the rotor R, thereby preventing the kneaded material kneaded in the casing 51 from leaking to the outside.

By the way, at the time of kneading, the rotor drive shaft portion 54 is deflected by a load, and the flange portion R1 of the rotor R is shaken. However, in the conventional mechanical seal 60, the packing 61 is pressed against the end surface of the flange portion R1 of the rotor R. Therefore, there is a problem that the kneaded material enters the sliding contact surface between the packing 61 and the end surface of the flange portion R1 of the rotor R.
When the kneaded material enters the sliding contact surface, the sliding contact surface remains open due to the entering material, and the material continuously leaks, or the inserted material returns to the casing 51 again to become contamination. There was a problem.
In order to cope with this problem, it is conceivable that the surface pressure acting on the sliding contact surface of the packing 61 is increased. However, this causes the wear of the packing 61 to be intense, and wear powder is easily generated. This leads to a new problem that the lifetime of the product is reduced.

  By the way, in order to cope with the above-mentioned problems, the applicant of the present application has proposed a mechanical seal in which the material that has entered the sliding contact surface is discharged to the outside without returning to the inside of the casing 51 again (see Patent Document 1). .

  As shown in FIG. 10, the mechanical seal 8 is a mechanical seal for sealing the rotor drive shaft portion 54 disposed so as to penetrate the side wall 52 of the casing 51 and project outside the casing 51. Cylindrical packing 2 disposed on the side wall 52 side and having the outer end surface 21 as a sliding contact surface, and urged toward the packing 2 by the urging means 35, and rotates integrally with the rotor drive shaft portion 54. And a cylindrical packing receiving member 3 having an inner end surface 31 slidably contacting the packing 2 as a sliding contact surface.

The packing 2 has a cylindrical shape with the outer end surface 21 on the bearing portion 56 side as a slidable contact surface, and is a convex portion on the outer peripheral surface in a state of being fitted on a large diameter portion 57 formed on the rotor drive shaft portion 54. 25 is fixed to the casing side wall 52 by the fixing ring 22 so as to press down.
The inner peripheral surface of the packing 2 has an inner portion 24 configured to minimize the gap with the large-diameter portion 57 on the casing 51 side, and a constant gap with the large-diameter portion 57 on the outer end surface 21 side. The outer part 23 which comprises the annular pocket 23a which has is formed.
The gap between the large-diameter portion 57 and the inner portion 24 cannot be eliminated due to its structure, and after the kneading operation is started, the kneaded material leaks from the minute gap between the large-diameter portion 57 and the inner portion 24. It will be.
However, the annular pocket 23a formed on the outer end face 21 side becomes a pooled portion of the leaked kneaded material, and the material once leaked from the casing 51 is effectively prevented from flowing back into the casing 5.

  The packing receiving member 3 is made of a cylindrical member having the inner end surface 31 on the casing 51 side as a sliding contact surface, and is in contact with the rotor drive shaft portion 54 with an O-ring 32 interposed on the inner peripheral portion. The taper portion 57A of the large diameter portion 57 is externally fitted.

  The outer end surface 33 on the bearing portion 56 side of the packing receiving member 3 is formed as a flange portion 34, and four locations on the inner peripheral portion of the flange portion 34 are pressed toward the packing 2 side by biasing means 35 made of a spring or the like. ing.

  The urging means 35 is interposed in a bolt 36 that passes through the flange portion 34 and is screwed to the large diameter portion 57 of the rotor drive shaft portion 54, and a nut 37 that is screwed to the bolt 36. By tightening and pressing the flange portion 34 from the outside, the packing receiving member 3 is urged toward the packing 2 side, and a gap is formed between the inner peripheral portion of the flange portion 34 and the outer peripheral portion of the rotor drive shaft portion 54. Thus, the packing receiving member 3 can be tilted.

  The packing receiving member 3 that rotates together with the rotor drive shaft portion 54 has an alignment property by the taper portion 57A of the rotor drive shaft portion 54 and the biasing means 35, and has a sliding contact surface (inner end surface 31) and a packing. The second sliding contact surface (outer end surface 21) is configured to be in contact with the outer periphery of the large-diameter portion 57 of the rotor drive shaft portion 54. Since a parallel contact state can always be maintained, material leakage hardly occurs. For this reason, it is not necessary to increase the surface pressure unnecessarily, and the lifetime of the packing can be maintained long.

By the way, when the mechanical seal 8 is cleaned at the end of kneading, when the rotor drive shaft portion 54 is rotated while the packing 2 and the packing receiving member 3 are in contact with each other, the material accumulated in the annular pocket 23a is removed. Although it is discharged in the form of a paper web, it is difficult to completely discharge the material accumulated in the annular pocket 23a, and it is necessary to disassemble the device in order to completely discharge the material accumulated in the annular pocket 23a. There has been a problem of having a lot of trouble in cleaning.
JP 2006-70977 A

  In view of such problems, an object of the present invention is to provide a mechanical seal that can easily discharge the material accumulated in the annular pocket portion to the outside during cleaning at the end of kneading.

In order to achieve the above object, a mechanical seal of the present invention is urged toward the packing side by a cylindrical packing disposed on the side wall side of the casing and having an outer end surface as a sliding contact surface, and urging means, and A cylindrical packing receiving member which is disposed so as to rotate integrally with the shaft portion and whose inner end surface is in sliding contact with the packing so as to pass through the side wall of the casing and protrude out of the casing. In the mechanical seal of the shaft portion disposed on the inner side of the flange portion of the packing receiving member, the packing receiving member is separated from the packing against the urging force of the urging means. A contact piece for moving the shaft portion outward in the axial direction, the contact piece is attached at an intermediate position, one end is swingably attached to the side wall of the casing, and the other end is an operation arm having an operation portion. Characterized by comprising a separation mechanism that forms.

In this case, the operating portion of the operating arm can be swung by the cam member.

  According to the mechanical seal of the present invention, the packing receiving member is provided with the separating mechanism that separates the packing receiving member from the packing against the urging force of the urging means. A gap is provided between the member and the material accumulated in the annular pocket portion can be easily discharged to the outside.

Then , the separation mechanism is in contact with the inside of the flange portion of the packing receiving member, the contact piece for moving the packing receiving member to the outside in the axial direction of the shaft portion, the corresponding contact piece is attached to an intermediate position, and one end is attached to the side wall of the casing The operation arm is pivoted and the contact piece presses the packing receiving member on the principle of the lever by pivoting the operation arm. The packing receiving member can be moved away from the packing to open the sliding contact surface between the packing receiving member and the packing.

  Further, the operation portion of the operation arm is swung by the cam member, and the cam member is rotated to swing the operation portion of the operation arm, and the packing receiving member is separated from the packing. The sliding contact surface between the packing receiving member and the packing can be opened. In this case, the gap between the packing receiving member and the packing is determined by the amount of eccentricity of the cam member, and can always be a gap suitable for material discharge. Furthermore, since the packing receiving member can be easily separated from the packing simply by rotating the cam member, a reliable cleaning operation can be performed in a short time.

  Hereinafter, embodiments of a mechanical seal of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment in which the mechanical seal 1 of the present invention is applied to a kneading apparatus 10.

  In addition, in this mechanical seal 1 and the kneading apparatus 10, about the structure similar to the content demonstrated by the prior art example, the description is abbreviate | omitted by writing the same code | symbol.

  The mechanical seal 1 is a mechanical seal for sealing the rotor drive shaft portion 54 that is disposed so as to penetrate the side wall 52 of the casing 51 and project outside the casing 51, and is disposed on the side wall 52 side of the casing 51. An inner end face disposed so as to rotate integrally with the rotor drive shaft portion 54 and urged toward the packing 2 by the urging means 35 and the cylindrical packing 2 having the outer end face 21 as a sliding contact surface. A cylindrical packing receiving member 3 having a sliding contact surface 31 for sliding contact with the packing 2 and a separation mechanism 4 for separating the packing receiving member 3 from the packing 2 against the biasing force of the biasing means 35. Has been.

  The packing 2 and the packing receiving member 3 have the same configuration as that of the conventional kneading apparatus 10 and will not be described.

In the present embodiment, the separation mechanism 4 abuts against the inner side 34a of the flange portion 34 of the packing receiving member 3 and moves the packing receiving member 3 outward in the axial direction of the rotor drive shaft portion 54. The contact piece 40 is attached to an intermediate position, one end 41a is attached to the side wall 52 of the casing 51 so as to be swingable, and the other end 41b is used as an operation arm 41.
The separation mechanism 4 is not particularly limited in its configuration as long as the packing receiving member 3 is separated from the packing 2 so as to generate a substantially uniform gap between the packing receiving member 3 and the packing 2. For example, as shown in the reference example shown in FIG. 7, the cap nut-shaped operation tube portion 44 disposed so as to be engaged with a cylindrical screw member 56 a protruding inside the bearing portion 56 is rotated. By operating, the packing receiving member 3 can be configured to move outward in the axial direction of the rotor drive shaft portion 54. In this case, by rotating the bearing member 45 between the packing receiving member 3 and the operation tube portion 44, the operation tube portion 44 can be smoothly rotated. In the separation mechanism 4 shown in FIG. 7, the outer periphery of the rotor drive shaft portion 54 including the packing receiving member 3 and the like is covered by a cylindrical screw member 56 a and an operation tube portion 44 that project from the bearing portion 56. Therefore, the appearance can be refreshed, and dust and the like can be prevented from adhering to the rotor drive shaft portion 54 including the packing receiving member 3 and the like.

As shown in FIG. 3, the contact piece 40 is attached near the center of the operation arm 41 by fastening means such as a bolt.
The abutment piece 40 is a roller so that it can rotate with respect to the operation arm 41 in order to prevent deterioration due to wear or the like due to contact with the inner side 34a of the flange portion 34 formed on the rotating packing receiving member 3. It is preferable to do.

One end 41 a of the operation arm 41 is swingably attached to the casing side wall 52 via a hinge 42.
Further, the other end 41 b of the operation arm 41 is moved in the axial direction of the rotor drive shaft portion 54 by the operation mechanism 9.

  As shown in FIG. 3, the operation arm 41 may have a U-shape in plan view with two ends 41 a that are swingably attached via the casing side wall 52 and the hinge 42 and one end 41 b. In addition, as shown in FIG. 6, a bar 43 that is formed in a rod shape and abuts against the cam member portion 90 a may be disposed at each of the other ends 41 b.

  The configuration of the operation mechanism 9 is not particularly limited, and a pressing means such as a cylinder can be used, and a cam member 90 can be used as shown in FIG.

The cam member 90 includes a cam member portion 90a that contacts the bar 43 extending from the other end 41b of the operation arm 41, and a rotating portion that can be rotated by a wrench or the like by shifting the cam member portion 90a and the shaft core. 90b, the pin 91 is loosely inserted into the insertion port 90c so as to be concentric with the axis of the rotating portion 90b, and the pin 91 is inserted into the hole 93b of the flange 93 and fixed by the bolt 92. .
As shown in FIG. 6, when the operation arm 41 is not formed in a U shape in plan view, the cam member 90 is connected by the connecting bar 95, and both cam members 90 are rotated to rotate both the cam members 90. It is preferable that the operation arms 41 and 41 swing.

The flange 93 is fixed to the lower part of the opening 52a of the side wall 52 of the casing 51 by a fixing means 94 such as a bolt. At this time, a long hole 93a is provided in the flange 93, and as shown in FIG. By attaching the flange 93 via the elongated hole 93a, the flange 93 can be easily positioned in the direction of the rotor drive shaft portion 54.
Thereby, the position of the cam member 90 can be easily made to correspond to the displacement of the packing receiving member 3 in the direction of the rotor drive shaft portion 54 due to wear of the packing 2.
In addition, without providing the long hole 93a in the flange 93, the hole 93b into which the pin 91 of the cam member 90 is loosely inserted is formed as a long groove in the axial direction of the rotor drive shaft portion 54, so that the position of the cam member 90 can be easily made. It can be made to correspond to.

In the above configuration, when cleaning at the end of kneading of the kneaded material, the cam member 90 is moved in the arrow Z direction with respect to the packing 2 and the packing receiving member 3 at the positions shown in FIGS. Rotate.
When the cam member portion 90a of the cam member 90 is in the position shown in FIG. 5B, the operation arm 41 swings around one end 41a, and the contact piece 40 moves in the arrow W direction.
As a result, the inner side 34a of the flange portion 34 formed on the outer end surface of the packing receiving member 3 is pressed against the contact piece 40, the entire packing receiving member 3 is separated from the packing 2 by L, and a gap S is formed (FIG. 5 (d)).

Then, when the rotor drive shaft portion 54 is rotated, the material accumulated in the annular pocket 23a moves in the form of a paper web in the annular pocket 23a, and the paper web-like material itself is removed from the gap S while cleaning the portion. However, at this time, the presence of the gap S facilitates the discharge of the material toward the open side where the gap S exists without causing the material to flow back to the casing 51, thereby smoothly discharging the material. And it can be done reliably.
In addition, the said part can also be made to clean by inserting an appropriate cleaning tool into the annular pocket 23a from the clearance S as needed.
Thereby, even when kneading | mixing material is changed, it can prevent reliably that material becomes a contamination.

  As mentioned above, although the mechanical seal of the present invention has been described based on the embodiments thereof, the present invention is not limited to the configurations described in the above embodiments, and for example, an open type kneading apparatus that does not use a pressure lid. The configuration can be changed as appropriate without departing from the spirit of the invention.

  Since the mechanical seal of the present invention has a characteristic that the material accumulated in the annular pocket portion can be easily discharged to the outside during cleaning at the end of kneading, the kneading material is frequently changed. It can be suitably used in a kneading apparatus or a kneading apparatus that handles high-quality kneading materials.

It is sectional drawing which shows the kneading apparatus using one Example of the mechanical seal of this invention. It is sectional drawing which shows the mechanical seal. It is a front view which shows the separation mechanism used for the mechanical seal. The operation mechanism of the separation mechanism used for the mechanical seal is shown, (a) is an XX arrow view of FIG. 3, (b) is a YY sectional view of (a). FIG. 4 is an operation explanatory view of a separation mechanism used for the mechanical seal, in which (a) is a normal state, (b) is a separation state, (c) is an enlarged view of part A of (a), and (d) is (b) ) Is an enlarged view of part B. It is a front view which shows the other separation mechanism used for the mechanical seal. It is a sectional view showing a reference example of releasing between mechanism used in the main Kanikarushiru. It is sectional drawing which shows the principal part of the conventional mechanical seal. It is front sectional drawing of the conventional kneading apparatus. It is sectional drawing which shows the principal part of the other conventional mechanical seal.

DESCRIPTION OF SYMBOLS 1 Mechanical seal 2 Packing 21 Outer end surface 22 Fixing ring 23 Outer part 23a Annular pocket 24 Inner part 3 Packing receiving member 31 Inner end face 32 O-ring 33 Outer end face (bearing part side)
34 Flange portion 34a Inside of flange portion 35 Energizing means 4 Separating mechanism 40 Contact piece 41 Operation arm 44 Operation cylinder portion 52 Casing side wall 54 Rotor drive shaft portion (shaft portion)
56 Bearing portion 57 Large diameter portion 9 Operating mechanism 90 Cam member 10 Kneading device

Claims (2)

A cylindrical packing having an outer end surface as a sliding contact surface disposed on the side wall side of the casing, and biased to the packing side by a biasing means, and disposed so as to rotate integrally with the shaft portion. In the mechanical seal of the shaft portion, which is formed so as to pass through the side wall of the casing and protrude out of the casing, comprising a cylindrical packing receiving member whose inner end surface is in sliding contact with the packing. An abutting piece for abutting the inner side of the flange portion of the packing receiving member that moves the member away from the packing against the urging force of the urging means, and for moving the packing receiving member outward in the axial direction of the shaft portion; Attach the abutment piece in an intermediate position, mounted swingably at one end to the side wall of the casing, characterized by comprising a separation mechanism which is composed of an operating arm in which the other end an operating portion mechanical sheet Le. The operating portion of the operating arms, a mechanical seal according to claim 1, characterized in that so as to swung by the cam member.

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