JP2015059601A - Shaft sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the occurrence of abnormal noise and damage of a seal member which are caused by a collar member moving independently of other members in a mechanical seal.SOLUTION: A shaft sealing device includes: a rubber seal member 140 including a cylindrical part 141 adhering to a peripheral surface of a rotary shaft 200 and a protruding part 142 extending from the cylindrical part 141 to the seal ring 120 side in an axis direction of the rotary shaft 200; a drive ring 150 which fastens the cylindrical part 141 to the rotary shaft 200; a case 160 which fixes a seal ring 120 to the protruding part 142 and is biased in the axis direction by a coil spring 170, the case 160 to which the drive ring 150 is attached; and a collar member 180 which regulates a deformation amount of the cylindrical part 141 deformed to the radial outer side and is positioned at the radial outer side relative to the cylindrical part 141. The collar member 180 protrudes from the atmosphere side to the sealed fluid side and is integrally provided with the drive ring 150.

Description

  The present invention relates to a shaft seal device.

  A mechanical seal as a shaft seal device includes a rotary ring that rotates with the rotary shaft by being provided on the rotary shaft side, and a stationary ring that is provided on the housing side having a shaft hole through which the rotary shaft is inserted. Then, the rotating ring and the stationary ring slide by the rotation of the rotating shaft. Further, the rotating ring is urged with respect to the stationary ring in the axial direction of the rotating shaft by a coil spring or the like, thereby ensuring the sealing performance on the sliding surface between the rotating ring and the stationary ring.

  In addition, a mechanical seal is known that seals (secondary seal) a gap between the rotating ring and the rotating shaft by providing a rubber seal member such as a rubber bellows in close contact with the rotating shaft. . In such a configuration, the seal member may be deformed outward in the radial direction due to an increase in fluid pressure on the sealed fluid side where the fluid is sealed. When the seal member is deformed radially outward, the adhesion to the rotating shaft is reduced, and the sealing performance becomes unstable. Therefore, as shown in Patent Document 1, a configuration using a backup ring 13 as a regulating member is employed in order to regulate the amount of deformation of the sealing member in the radial direction.

Japanese Utility Model Publication No. 5-66373

  The backup ring 13 of Patent Document 1 is a member that is provided between the fastening ring 7, the pusher 9, and the rubber bellows 8, and is separate from other members. For this reason, the backup ring 13 may move independently of other members along with the rotational movement of the rotating shaft, and in that case, there is a possibility that abnormal noise may be generated. Further, when the backup ring moves, the tip portion thereof may come into contact with the seal member, and the seal member may be damaged.

  Then, an object of this invention is to suppress generation | occurrence | production of the abnormal noise and damage to a sealing member by a control member moving independently from another member in a shaft seal device.

  The present invention employs the following means in order to solve the above problems.

That is, the shaft seal device of the present invention is
In a shaft sealing device that is provided between a rotating shaft and a housing having a shaft hole through which the rotating shaft is inserted, and seals fluid in the housing.
A rotating ring provided on the rotating shaft and rotating together with the rotating shaft;
A stationary ring provided on the housing side and sliding with the rotating ring;
A biasing member that biases the rotating ring in the axial direction of the rotating shaft with respect to the stationary ring;
The stationary ring is provided on the opposite side of the axial direction with respect to the rotating ring, a cylindrical portion that is in close contact with the peripheral surface of the rotating shaft, and a protrusion that extends from the cylindrical portion toward the rotating ring in the axial direction. A rubber seal member having a portion;
A fastening member for fastening the tubular portion to the rotation shaft;
A fixing member that fixes the rotating ring and the projecting portion on one end side in the axial direction and that fixes the fastening member on the other end side, and is fixed to be urged in the axial direction by the urging member. Members,
A restricting member that restricts the amount of deformation of the tubular portion toward the outside in the radial direction, the restricting member positioned outside the tubular portion in the radial direction;
With
The restriction member protrudes from the other end side in the axial direction toward the one end side and is provided integrally with the tightening member.

  According to this configuration, the amount of deformation of the seal member toward the outside in the radial direction is restricted by the restriction member positioned on the outside in the radial direction with respect to the cylindrical portion of the seal member. When the amount of deformation of the seal member in the radial direction is restricted, the adhesion between the cylindrical portion of the seal member and the peripheral surface of the rotating shaft is maintained, and the sealability of the seal member is stabilized.

  Since the fastening member is attached to a fixing member that fixes the rotating ring and the protruding portion of the seal member, the fastening member rotates together with the rotating ring. Since the restricting member is provided integrally with the fastening member that rotates together with the rotating ring, it does not move independently of other members such as the rotating ring, the fastening member, and the seal member. Therefore, it is possible to suppress the generation of abnormal noise and damage to the seal member due to the restriction member moving independently of the other members as the rotation shaft rotates.

  In addition, the fixing member and the fastening member are fixed by fitting the mounting portion provided in the fixing member extending in the axial direction and the notch provided in the fastening member, and the regulating member is more than the notch of the fastening member. Is also preferably provided on the radially inner side of the rotating shaft. With such a configuration, the bulging portion of the seal member does not contact the notch of the fastening member, and damage to the seal member can be prevented.

  Further, it is preferable that the surface of the restricting member that faces the tubular portion of the seal member is an inclined surface that is inclined so as to be separated from the tubular portion of the seal member toward the tip of the restricting member. With such a configuration, since the tip of the regulating member has an obtuse angle, even if the tip of the regulating member comes into contact with the seal member, the force locally applied to the seal member is small and the seal member is hardly damaged.

  Furthermore, it is preferable that the inclined surface of the restricting member extends from a tightening surface that contacts the tubular portion of the seal member among the tightening members. With such a configuration, the corner portion of the tightening surface that contacts the cylindrical portion of the seal member becomes an obtuse angle, so that the force locally applied to the cylindrical portion of the seal member is small and the seal member is hardly damaged.

  As described above, according to the present invention, in the shaft seal device, it is possible to suppress the generation of abnormal noise and damage to the seal member due to the movement of the regulating member.

FIG. 1 is a schematic cross-sectional view illustrating the overall configuration of the mechanical seal according to the first embodiment. FIG. 2 is an enlarged cross-sectional view illustrating the vicinity of the seal member of the mechanical seal according to the first embodiment. FIG. 3 is an enlarged cross-sectional view showing the vicinity of a seal member of a mechanical seal according to a comparative example. FIG. 4 is an enlarged cross-sectional view illustrating the vicinity of the seal member of the mechanical seal according to the second embodiment. FIG. 5 is an enlarged cross-sectional view illustrating the vicinity of the seal member of the mechanical seal according to the third embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.

Example 1
<Configuration of Mechanical Seal According to Example 1>
With reference to FIG. 1, the structure of the mechanical seal as a shaft seal apparatus which concerns on Example 1 is demonstrated. FIG. 1 is a schematic cross-sectional view illustrating the overall configuration of the mechanical seal according to the first embodiment. In the first embodiment, a single seal using one mechanical seal will be described. However, the present invention is not limited to this, and the present invention can also be applied to a double seal using two mechanical seals.

  The mechanical seal 100 according to the first embodiment is a shaft seal device that is provided between a rotating shaft 200 and a housing 300 having a shaft hole through which the rotating shaft 200 is inserted, and seals fluid in the housing 300.

  The mechanical seal 100 according to the first embodiment includes a mating ring 110 as a stationary ring provided on the housing 300 side, and a seal ring 120 as a rotary ring that is provided on the rotary shaft 200 and rotates together with the rotary shaft 200. Yes. The seal ring 120 may be directly attached to the rotating shaft 200 or may be attached to the rotating shaft 200 via a cylindrical sleeve or the like.

  The seal ring 120 is provided on the atmosphere side (B side in FIG. 1), and the mating ring 110 is provided on the sealed fluid side (A side in FIG. 1) where a fluid having a higher pressure than the atmosphere is sealed. ing. As the rotating shaft 200 rotates, the end surface 110a of the mating ring 110 and the end surface 120a of the seal ring 120 slide. Thus, the end surface 110a and the end surface 120a that slide with each other seal the fluid sealed to the sealing fluid side (primary seal).

  The mechanical seal 100 according to the first embodiment includes a cylindrical cup gasket 130 that seals a gap between the mating ring 110 and the housing 300. The cup gasket 130 is in contact with the mating ring 110 on the inner peripheral surface side, and is in contact with the housing 300 at the cup gasket deformed portion 130a on the outer peripheral surface side. A dotted line in the vicinity of the cup gasket 130 in FIG. 1 represents the shape of the cup gasket deformed portion 130 a before the cup gasket 130 is brought into contact with the housing 300.

  Furthermore, the mechanical seal 100 according to the first embodiment includes a seal member 140, a drive ring 150 as a tightening member that tightens (holds) the seal member 140 with respect to the rotating shaft 200, and the seal ring 120 and the seal member 140. And a case 160 as a fixing member to be fixed. These members are integrated and rotate as the rotating shaft 200 rotates.

The seal member 140 is made of a rubber member. In addition, as the sealing member 140, it is preferable to use a bellows having a bellows shape and excellent elasticity. As shown in FIG. 1, the seal member 140 is provided on the opposite side of the rotary ring 120 from the stationary ring 110, and has a cylindrical portion 141 that is in close contact with the peripheral surface of the rotary shaft 200, and the cylindrical portion 141 is connected to the rotary shaft. 200 and a projecting portion 142 extending toward the rotary ring side (inner side) in the axial direction. A dotted line in the vicinity of the seal member 140 in FIG. 1 represents the shape of the seal member deformed portion 141 a before the cylindrical portion 141 of the seal member 140 is brought into close contact with the rotating shaft 200. The seal member 140 made of a rubber member seals (secondary seal) the gap between the seal ring 120 and the rotary shaft 200 while allowing the displacement of the rotary shaft 200.

  The drive ring 150 fastens the cylindrical portion 141 of the seal member 140 with respect to the rotation shaft 200. The drive ring 150 is made of metal or the like, but is not limited thereto as long as it can withstand stress.

  The case 160 fixes the seal ring 120 and the protruding portion 142 of the seal member 140 at one end side in the axial direction of the rotary shaft 200 (A side in FIG. 1), and seals the gap between these members. . In a state where the seal ring 120 and the protruding portion 142 of the seal member 140 are in contact with each other, a bending portion 161 is formed by bending one end of the case 160, and the seal ring 120 and the protruding portion 142 of the seal member 140 are fixed. The Further, the seal ring 120 has a notch 121 in a part on the outer diameter side, and the fitting portion 162 of the case 160 is fitted in the notch 121. Therefore, the seal ring 120 is fixed so as not to rotate relative to the case 160.

  In addition, the case 160 and the drive ring 150 are fixed by fitting the mounting portion 163 provided in the case 160 extending in the axial direction of the rotary shaft 200 and the notch 151 provided in the drive ring 150. The case 160 is made of metal or the like, but is not limited thereto as long as it can withstand stress. Further, a plurality of the attaching portions 163 and the notches 151 may be provided in the circumferential direction.

  A flange member 180 is provided as a restricting member protruding from the drive ring 150 toward the seal member. The flange member 180 is a member that regulates the amount of deformation of the seal member 140 in the radial direction. The flange member 180 is located on the radially outer side than the cylindrical portion 141 of the seal member 140, and on the radially inner side of the notch 151 of the drive ring 150, more specifically, from the outer peripheral surface of the notch 151. Is also provided on the radially inner side.

  With the above configuration, the seal ring 120, the seal member 140, and the drive ring 150 are fixed by the case 160 on the rotating ring side. Then, the rotational force of the rotary shaft 200 is transmitted to the seal ring 120 via the seal member 140, the drive ring 150, and the case 160, and the seal ring 120 rotates while sliding on the mating ring 110.

  As shown in FIG. 1, the mechanical seal 100 according to the first embodiment includes a coil spring 170 as an urging member. The coil spring 170 is provided so as to apply a biasing force to the seal ring 120 via the case 160. Due to the urging force of the coil spring 170, the surface pressure between the end surface 120a of the seal ring 120 and the end surface 110a of the mating ring 110 is secured, and the sealing performance can be secured. Even if the end surface 120 a of the seal ring 120 and the end surface 110 a of the mating ring 110 are worn by sliding, the seal ring 120 has an axial line with respect to the mating ring 110 by the biasing force of the coil spring 170. Since it follows the direction, sealing performance is ensured.

<The outstanding point of the mechanical seal which concerns on Example 1>
Next, with reference to FIG. 2 and FIG. 3, the excellent point of the mechanical seal 100 which concerns on Example 1 is demonstrated. FIG. 2 is an enlarged cross-sectional view showing the vicinity of the seal member of the mechanical seal according to the first embodiment, and shows a state in which the pressure on the sealing fluid side is increased. FIG. 3 is an enlarged cross-sectional view showing the vicinity of a seal member of a mechanical seal that does not have a brim member as a comparative example, and shows a state in which the pressure on the sealed fluid side is increased. The effect of the brim member will be described with reference to FIG. Since the mechanical seal of the comparative example shown in FIG. 3 has the same configuration as the mechanical seal of Example 1 except that it does not have a brim member, the description thereof is omitted using the same reference numerals.

  There is a case where the cylindrical portion 141 of the seal member 140 is elastically deformed so as to be lifted to the outside in the radial direction due to the high pressure in the sealed fluid side (A side in the drawing) region where the fluid is sealed. In such a case, as shown in FIG. 3, the seal member 140 may bulge outward in the radial direction, and the seal member 140 may move or the internal fluid may leak.

  Therefore, the mechanical seal 100 according to the first embodiment includes a brim member 180 as a regulating member. The flange member 180 is a member that regulates the amount of deformation of the seal member 140 in the radial direction. The flange member 180 is located on the outer side in the radial direction from the cylindrical portion 141 of the seal member 140.

  By providing the flange member 180 in this way, even if the cylindrical portion 141 of the seal member 140 is to be deformed so as to float outward in the radial direction by increasing the pressure on the sealed fluid side (A side in the figure), the flange member 180 180 regulates the deformation amount of the seal member 140. For this reason, the adhesion between the rotating shaft 200 and the cylindrical portion 141 of the seal member 140 is maintained. As a result, the sealing performance between the rotating shaft 200 and the sealing member 140 is stabilized, and leakage of the fluid sealed on the sealing fluid side is suppressed.

  Further, since the drive ring 150 is attached to the case 160 that fixes the seal ring 120 and the seal member 140, the drive ring 150 rotates together with the seal ring 120. In the first embodiment, the flange member 180 is provided integrally with the drive ring 150 that rotates together with the seal ring 120, so that it is independent from other members such as the seal ring 120, the drive ring 150, and the seal member 140. It doesn't move. Therefore, it is possible to suppress the generation of abnormal noise and damage to the seal member 140 due to the flange member 180 moving independently of the other members as the rotation shaft 200 rotates.

  Further, the flange member 180 protrudes from the atmosphere side (B side, the other end side) toward the sealed fluid side (A side, one end side) in the axial direction of the rotating shaft 200. When the pressure on the sealed fluid side increases, the seal member 140 may move to the atmosphere side or the shape may be deformed to the atmosphere side. Therefore, there is a possibility that the seal member 140 and the tip end portion 180a of the flange member 180 come into contact with each other due to such movement and deformation. When the front end portion 180a of the flange member 180 contacts the seal member 140, the seal member 140 may be damaged, and the sealing performance may be deteriorated. However, in Example 1, the tip portion 180a of the brim member is chamfered and has a rounded shape. Therefore, even if the tip end portion 180a of the brim member 180 contacts the seal member 140, the seal member 140 is not easily damaged.

  Furthermore, since the flange member 180 is provided radially inward from the notch 151, it is possible to prevent damage to the seal member 140 without the bulging portion of the seal member 140 contacting the notch 151. Become.

(Example 2)
FIG. 4 is an enlarged cross-sectional view illustrating the vicinity of the seal member of the mechanical seal according to the second embodiment. Since the second embodiment is the same as the first embodiment except that the shape of the flange member is different, the same components are denoted by the same reference numerals and the description thereof is omitted.

  The mechanical seal 100 according to the second embodiment includes a flange member 280 provided integrally with the drive ring 150. The surface of the brim member 280 facing the cylindrical portion 141 of the seal member 140 is sealed from the atmospheric side (B side, the other end side) in the axial direction of the rotary shaft 200 toward the tip of the brim member 280. As it goes to the fluid side (A side, one end side), an inclined surface 280b is formed so as to be inclined away from the cylindrical portion 141 of the seal member 140.

  The brim member 280 of the second embodiment has an inclined surface 280b, so that the lower part of the distal end portion 280a of the brim member 280 has an obtuse angle portion (edge portion) C. In this embodiment, since the chamfer is chamfered, the corner portion C has a rounded shape, and the tip end portion 280a is also chamfered, and the tip end portion 280a is rounded as a whole. When the cylindrical portion 141 of the seal member 140 is deformed so as to float outward in the radial direction of the rotary shaft 200, or when the seal member 140 is deformed in the axial direction of the rotary shaft 200, the seal member 140 Although there is a risk of contact with the lower portion, even if the seal member 140 comes into contact with the flange member 280, the locally applied force is small, so that the seal member 140 is not easily damaged.

  In the second embodiment, the tightening surface 150a of the drive ring 150 that contacts the cylindrical portion 141 of the seal member 140 and the inclined surface 280b of the brim member 280 are connected via a step 280c. Thus, by having the step portion 280c, the positional deviation in the axial direction of the rotating shaft 200 between the seal member 140 and the drive ring 150 is suppressed.

(Example 3)
FIG. 5 is an enlarged cross-sectional view illustrating the vicinity of the seal member of the mechanical seal according to the third embodiment. Since Example 3 is the same as Example 1 except that the shape of the collar member is different, the same components are denoted by the same reference numerals and description thereof is omitted.

  Similar to the second embodiment, the brim member 380 of the third embodiment has an inclined surface 380b so that the lower portion of the tip portion 380a of the brim member 380 has an obtuse corner C. Unlike the second embodiment, the inclined surface 380 b extends from the tightening surface 150 a that contacts the cylindrical portion 141 of the seal member 140 in the drive ring 150. Therefore, the tightening surface 150a of the drive ring 150 and the inclined surface 380b of the brim member 380 are connected without a stepped portion (280c in FIG. 4). In the third embodiment, an obtuse corner portion (edge portion) D formed by the inclined surface 380b of the flange member 380 and the tightening surface 150a of the drive ring 150 comes into contact with the tubular portion 141 of the seal member 140. Since the force locally applied to the cylindrical portion 141 is small, the cylindrical portion 141 of the seal member 140 is hardly damaged.

  In the said Example 2, 3, since a collar member becomes thick in the radial direction of the rotating shaft 200 because a collar member has an inclined surface, the effect that intensity | strength becomes high can be acquired. Further, since the brim member is thick, even if the tip of the brim member contacts the seal member 140, the force applied locally to the seal member 140 is small. Therefore, the seal member 140 is not easily damaged.

  In the second and third embodiments, the brim member is configured to have an inclined surface only on the radially inner side (the tightening surface 150a side) of the rotating shaft 200, but is not limited thereto. The structure which has an inclined surface also in the surface outside a direction may be sufficient.

100 Mechanical seal 110 Menting ring 110a End face (menting ring)
120 Seal ring 120a End face (seal ring)
121 Notch 130 Cup gasket 130a Cup gasket deformed portion 140 Seal member 141 Tubular portion 141a Seal member deformed portion 142 Protruding portion 150 Drive ring 150a Tightening surface 151 Notch 160 Case 161 Bending portion 162 Fitting portion 163 Mounting portion 170 Coil spring 180, 280, 380 Collar member 180a Tip portion 280b, 380b Inclined surface 200 Rotating shaft 300 Housing

Claims (4)

In a shaft sealing device that is provided between a rotating shaft and a housing having a shaft hole through which the rotating shaft is inserted, and seals fluid in the housing.
A rotating ring provided on the rotating shaft and rotating together with the rotating shaft;
A stationary ring provided on the housing side and sliding with the rotating ring;
A biasing member that biases the rotating ring in the axial direction of the rotating shaft with respect to the stationary ring;
The stationary ring is provided on the opposite side of the axial direction with respect to the rotating ring, a cylindrical portion that is in close contact with the peripheral surface of the rotating shaft, and a protrusion that extends from the cylindrical portion toward the rotating ring in the axial direction. A rubber seal member having a portion;
A fastening member for fastening the tubular portion to the rotation shaft;
A fixing member that fixes the rotating ring and the projecting portion on one end side in the axial direction and that fixes the fastening member on the other end side, and is fixed to be urged in the axial direction by the urging member. Members,
A restricting member that restricts the amount of deformation of the tubular portion toward the outside in the radial direction, the restricting member positioned outside the tubular portion in the radial direction;
With
The shaft sealing device, wherein the restricting member protrudes from the other end side in the axial direction toward the one end side and is provided integrally with the tightening member.   The fixing member and the tightening member are fixed by fitting the mounting portion provided in the fixing member extending in the axial direction and the notch provided in the tightening member, and the regulating member is the cutting member. The shaft seal device according to claim 1, wherein the shaft seal device is provided on a radially inner side of the rotary shaft than a notch.   The surface of the regulating member that faces the cylindrical portion is an inclined surface that is inclined so as to be separated from the cylindrical portion as it goes from the other end side in the axial direction toward the one end side. The shaft seal device according to claim 1 or 2.   The shaft sealing device according to claim 3, wherein the inclined surface extends from a tightening surface that contacts the tubular portion of the tightening member.

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