JP2011052735A - Horizontal rotating shaft sealing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal rotating shaft sealing mechanism easily mounted and removed and high in fluid leakage preventing performance. <P>SOLUTION: The horizontal rotating shaft sealing mechanism preventing a leakage of a fluid leaking from the clearance between a horizontal rotating shaft rotated only in a fixed direction, and a casing into which the rotating shaft is inserted, includes a specific spiral elastic body and a plate spring installed in a specific position of the spiral elastic body. The spiral elastic body is formed in a spiral shape in the same direction as the rotating direction of the rotating shaft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a horizontal rotary shaft sealing mechanism that rotates in a fixed direction.

  An oil seal that is frequently used as a horizontal rotating shaft sealing mechanism is an annular structure (FIG. 7 and FIG. 6 of Patent Document 1). Therefore, when the oil seal is removed, the oil seal must be moved to the end of the horizontal rotating shaft and removed. In addition, when installing the oil seal, the oil seal must be inserted from the end of the rotating shaft and moved to a predetermined position.

  FIG. 8 shows a procedure for replacing the oil seal installed in the pump as an example of conventional oil seal replacement work.

  The procedure for removing the oil seal will be described with reference to FIG. 8. First, the casing cover (1) is removed. Next, the impeller clamping nut (2) that is tightening the impeller is removed, and the impeller (3) is removed. Further remove the casing (20). Remove the mechanical seal (4). Finally, the oil seal (5) is removed.

Japanese Patent No. 2983419

  As described above, the oil seal removal operation often requires disassembly / removal of peripheral parts, equipment, and facilities other than the oil seal.

  Some of the peripheral parts, equipment or facilities other than the oil seal cannot be reused once disassembled and need to be replaced with new ones (for example, mechanical seals). Many things are needed, which is inconvenient in terms of time and money.

  In view of these circumstances, the problem to be solved by the present invention is that only the oil seal can be removed and attached without disassembling / removing peripheral parts, equipment or facilities other than the oil seal, and It is to provide a horizontal rotary shaft sealing mechanism with high fluid leakage prevention performance.

  In order to solve the above-described problem, a horizontal rotating shaft shaft sealing mechanism that prevents leakage of fluid leaking from a gap between a horizontal rotating shaft that rotates only in a certain direction and a casing in which the rotating shaft is inserted, the rotating shaft A helical elastic body having a width in contact with both the shaft and the casing, and a leaf spring installed in the vicinity of a peripheral edge of the helical elastic body on the side in contact with the casing, wherein the helical elastic body is rotated A horizontal rotary shaft sealing mechanism characterized by a spiral shape in the same direction as the rotational direction of the shaft, and a surface of the spiral elastic body on the side in contact with the rotary shaft or the casing of the spiral elastic body Provided is a horizontal rotation shaft sealing mechanism in which at least one of the side surfaces is a curved surface.

  Since the screw seal which is the horizontal rotation shaft shaft sealing mechanism of the present invention corresponding to claim 1 is a spiral elastic body, it can be removed simply by hooking and pulling with a sharp tip. Further, it can be attached simply by inserting it while being wound around the rotating shaft. Furthermore, since it has a helical shape in the same direction as the rotation direction of the rotary shaft, when the rotary shaft rotates, there is an effect of moving the fluid along the helical elastic body, thereby preventing fluid leakage. Get higher. Further, since the elastic body is layered in the horizontal direction, a fluid leakage prevention function due to the labyrinth effect can also occur.

  Furthermore, the screw seal which is the horizontal rotating shaft shaft sealing mechanism of the present invention corresponding to claim 2 can smoothly follow the shaft movement that may occur when the rotating shaft rotates, and the local axis of the rotating shaft It also reduces wear. Further, the adhered grease can be maintained, and the frictional resistance with the rotating shaft is reduced.

  Furthermore, the screw seal which is the horizontal rotary shaft sealing mechanism of the present invention corresponding to claim 3 reduces fluid leakage that leaks through the casing.

FIG. 1 is a side view of a screw seal and a cross-sectional view after cutting with a screw seal. FIG. 2 is a detailed side view of the screw seal. FIG. 3 is a front view of the screw seal. FIG. 4 is a detailed explanatory diagram in the dotted frame of FIG. FIG. 5 is a diagram showing an example of preventing the screw seal from falling off (using a screw seal presser). FIG. 6 is a view showing another example of preventing the screw seal from falling off (using a snap ring). FIG. 7 is a cross-sectional view of a conventional oil seal. FIG. 8 is a cut sectional view of a conventional pump including an oil seal.

  The horizontal rotary shaft sealing mechanism of the present invention is attached by winding a screw seal having a spiral shape in the same direction as the rotation direction of the horizontal rotary shaft around the rotary shaft.

  Example 1 is a screw seal (30) in which the rotation direction of the horizontal rotation shaft is clockwise.

  The structure of the screw seal of Example 1 will be described with reference to FIGS. 1, 2, 3, and 4. For convenience, the surface of the spirally wound base (300) that is in contact with the horizontal rotating shaft (10) is spirally shaped. The surface of the spirally wound base body (300a) and the surface of the spirally wound base body (300) in contact with the casing (20) are referred to as the spirally wound base body outer peripheral surface (300b).

  The screw seal (30) has a width in contact with both the rotating shaft (10) and the casing (20), and a clockwise spirally wound base (300), and the casing (20) of the base (300). And a leaf spring (301) installed at a position in the vicinity of the peripheral edge on the side in contact with.

  In addition, although the material of the said base | substrate (300) uses the nitrile rubber, it is also possible to use the elastic body which changes with fluids. However, it is preferable to use a material having a dynamic friction coefficient of 0.8 μ10 min or less.

  The length relationship between the shaft diameter of the rotating shaft (10) and the portion where the base (300) is in contact with the rotating shaft (10) is based on the premise that they are in contact with zero reference. When the base material is nitrile rubber, the shaft diameter plus 0.1 mm to the shaft diameter minus 0.1 mm is acceptable.

  In addition, although the depth dimension (width dimension after layered mounting in the horizontal direction) of the entire base body (300) is the same as the JIS standard thickness dimension of the oil seal (5), the effect of the present invention is achieved. If it is a screw seal (30) which plays, it will not be limited to the dimension of the said JIS standard.

  In addition, although the said base | substrate inner peripheral surface (300a) and the said base | substrate outer peripheral surface (300b) are processed into the curved surface by 1R, it changes with various conditions.

  The base outer peripheral surface (300b) and the casing (20) are fixed by a liquid gasket.

    In addition, the size and position of the leaf spring (301) installed at a position near the peripheral edge on the side in contact with the casing (20) vary depending on the size of the base body (300).

  The operation of removing the screw seal (30) of the first embodiment will be described.

  The base body (300) is pulled with a sharp object.

  The screw seal (30) can be removed by pulling the base (300) with a force greater than the pressure applied to the casing (20) by the leaf spring (301).

  The mounting operation of the screw seal (30) of the first embodiment will be described.

  The base (300) of the screw seal (30) to be attached is inserted while being wound around the rotating shaft (10).

  If all of the base body (300) can be inserted, the position of the base body (300) is adjusted.

  When the position adjustment of the base body (300) is completed, grease adheres to the contact portion between the casing (20) and the base body inner peripheral surface (300a), and the casing (20) and the base body outer peripheral surface (300b). Apply a liquid gasket to the contact area.

  When the oil side is 0.03 MPa or more, an oil seal presser (40) or a snap ring (50) is attached to prevent the screw seal (30) from falling off (FIGS. 5 and 6).

  The shaft sealing operation of the screw seal according to the first embodiment will be described with reference to FIGS. 1, 2, 3, and 4.

  When the rotating shaft (10) starts to rotate in the clockwise direction, the base outer peripheral surface (300b) is firmly fixed to the casing (20) with the leaf spring (301) and the liquid gasket. Sliding of the inner peripheral surface (300a) of the base starts.

  When the oil has traveled from the fluid side toward the atmosphere side along the axis of the rotary shaft (10), the base body inner peripheral surface (300a) is in contact with the rotary shaft (20). The oil is sealed at the contact portion between the rotating shaft (20) and the base (300) (does not leak to the atmosphere side).

  Temporarily, a small amount of oil has passed through the contact portion between the rotating shaft (20) and the base body (300) and moved (leaked) to the sliding inner peripheral surface (300a). However, when the rotating shaft (20) continues to rotate in the clockwise direction, the oil is moved (returned) in the fluid side direction along the base body inner peripheral surface (300a) which is a sliding surface. ).

  Further, even if a slight gap is generated between the rotating shaft (20) and the inner peripheral surface (300a) of the base body, as long as the rotating shaft (20) continues to rotate, the horizontal direction is not affected. Since the elastic body is layered, the fluid leakage prevention function due to the labyrinth effect occurs, and the horizontal rotating shaft sealing function is maintained.

  Example 2 is a screw seal (not shown) for rotating the horizontal rotating shaft (10) in the counterclockwise direction.

  Only the differences from the first embodiment regarding the configuration of the screw seal (not shown) of the second embodiment will be described.

  The only difference is that the helical direction of the helically wound substrate (300) is the counterclockwise direction.

  Since the screw seal (not shown) mounting and removing operations of the second embodiment are not different from the first embodiment, the description thereof is omitted.

  The shaft sealing operation of the screw seal (not shown) according to the second embodiment is the difference only in the rotation direction, and the description thereof is omitted.

  The horizontal rotary shaft shaft sealing mechanism of the present invention facilitates the removal and installation of the screw seal while having a simple structure, and dramatically improves the maintainability of the device to which the screw seal is attached. Has availability.

DESCRIPTION OF SYMBOLS 1 Casing cover 2 Impeller clamping nut 3 Impeller 4 Mechanical seal 5 Oil seal 10 Horizontal rotating shaft 20 Casing 30 Screw seal 300 Spiral winding base 300a Spiral winding base inner peripheral surface (surface in contact with the rotary shaft)
300b Helical winding base outer peripheral surface (surface on the side in contact with the casing)
301 Leaf spring 40 Screw seal presser 50 Snap ring

Claims (3)

A horizontal rotating shaft shaft sealing mechanism that prevents leakage of fluid leaking from a gap between a horizontal rotating shaft that rotates only in a certain direction and a casing in which the rotating shaft is inserted,
A helical elastic body having a width in contact with both the rotating shaft and the casing;
A leaf spring installed in the vicinity of the peripheral edge of the spiral elastic body on the side in contact with the casing;
Have
The helical elastic body has a helical shape in the same direction as the rotational direction of the rotary shaft,
Horizontal rotary shaft seal mechanism.   The horizontal rotation shaft shaft sealing mechanism according to claim 1, wherein a surface of the helical elastic body that contacts the rotation shaft is a curved surface.   The horizontal rotating shaft shaft sealing mechanism according to claim 1 or 2, wherein a surface of the spiral elastic body on a side in contact with the casing is a curved surface.