JP2013072510A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent foreign matter such as an abrasion chip of a first seal member from flowing out to the downstream side of a flow passage.SOLUTION: This seal structure includes a shaft body 11 which is arranged over the inside and the outside of the flow passage 6a for making liquid 5 flow and is driven within the flow passage 6a, a guide member 12 having one end oppositely arranged to the flow passage 6a and movably supporting the shaft body 11 to the flow passage 6a, the first seal member 13 arranged between the guide member 12 and the shaft body 11 and sealing the flow passage 6a, a second seal member 14 arranged between the flow passage 6a and the guide member 12 and sealing the flow passage 6a, and a cylindrical wall 15 for cutting off one end of the guide member 12 from a flow of the liquid 5.

Description

  The present invention relates to a seal structure that seals between a shaft body driven in a flow path and an inner surface of the flow path by a seal member.

  Patent Document 1 discloses a seal structure including a shaft body that is driven in a pipe through which a liquid flows, and a seal member that seals between the inner wall of the flow path and the shaft body. As shown in FIG. 10, this type of seal structure 101 includes a shaft body 111 disposed across the inside and the outside of the flow path 106 a of the pipe 106, and a drive unit 110 for driving the shaft body 111. ing.

  The drive unit 110 includes a piston 110a and a cylinder 110b for driving the shaft body 111 with, for example, hydraulic pressure, and a partition wall 112 that partitions the flow path 106a and the cylinder 110b. The shaft body 111 is movably inserted into the shaft hole 112 a of the partition wall 112, and a seal member 113 that seals the flow path 106 a is provided between the shaft hole 112 a and the shaft body 111.

Japanese Patent No. 3399881

  By the way, in the seal structure described in Patent Document 1 described above, the seal member wears with the sliding of the shaft body and the seal member, and foreign matter that is wear debris is generated. As described above, there is a problem that the foreign matter generated in the vicinity of the seal member is caused to flow by the liquid flowing through the flow path of the pipe and flow out downstream of the flow path. In addition, the liquid component may solidify and adhere to the shaft, and the foreign matter that is adhering material attached to the shaft is caused to flow by the liquid flowing through the flow path of the pipe and flow out downstream of the flow path. There is also a problem.

  Then, an object of this invention is to provide the seal structure which can solve the subject of the said related technique. An example of the object of the present invention is to prevent foreign matter generated in the vicinity of one end on the flow path side of the guide member that movably supports the shaft body in the flow path from flowing out by the liquid flowing through the flow path.

  In order to achieve the above-described object, the seal structure according to the present invention is provided across the inside and outside of the flow path through which the liquid flows, and is provided with a shaft body that is driven in the flow path and one end facing the flow path. A guide member that movably supports the shaft body relative to the flow path, a first seal member that is disposed between the guide member and the shaft body and seals the flow path, and between the flow path and the guide member And a second sealing member that seals the flow path, and a cylindrical wall for blocking one end of the guide member from the liquid flow.

  According to the present invention, it is possible to prevent foreign matters such as wear debris of the first seal member that are generated near one end of the guide member on the flow path side from flowing out downstream of the flow path.

It is sectional drawing which shows the seal structure of 1st Embodiment. It is sectional drawing for demonstrating the seal structure of 1st Embodiment. It is sectional drawing for demonstrating the seal structure of 1st Embodiment. It is sectional drawing which shows the seal structure of 2nd Embodiment. It is sectional drawing for demonstrating the seal structure of 2nd Embodiment. It is sectional drawing which shows the seal structure of 3rd Embodiment. It is sectional drawing for demonstrating the seal structure of 3rd Embodiment. It is a perspective view which shows the seal structure of 4th Embodiment. It is sectional drawing for demonstrating the seal structure of 4th Embodiment. It is sectional drawing which shows the seal structure relevant to this invention.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a cross-sectional view of the seal structure of the first embodiment. 2 and 3 are cross-sectional views for explaining the seal structure of the first embodiment.

  As shown in FIG. 1, the seal structure 1 of the first embodiment includes a shaft body 11 disposed across the inside and the outside of a flow path 6 a of a pipe 6 through which a liquid 5 flows, and a shaft body in the flow path 6 a. And a drive unit 10 for driving 11.

  Further, the seal structure 1 is provided in the pipe 6 with one end facing the flow path 6a, and supports the shaft body 11 so as to be movable with respect to the flow path 6a, the guide member 12, and the shaft body 11. A first seal member 13 that seals the flow path 6a, a second seal member 14 that is disposed between the flow path 6a and the guide member 12 and seals the flow path 6a, It has.

  The pipe 6 has a flow path 6a bent in a substantially L shape. The pipe 6 is integrally formed with a cylindrical wall 15 that supports the outer periphery of the guide member 12. The cylindrical wall 15 is formed so as to intersect the inner surface 6 b forming the flow path 6 a of the pipe 6, and has a function of blocking one end of the guide member 12 from the flow of the liquid 5.

  Although not shown, the drive unit 10 includes a piston and a cylinder for driving the shaft body 11 with, for example, hydraulic pressure. The piston is coupled to the shaft body 11 via the connecting member 10a.

  As shown in FIG. 1, the guide member 12 has a distance L between one end and the inner surface 6 b forming the flow path 6 a of the pipe 6 longer than the drive stroke St of the shaft body 11. Thus, even when the shaft body 11 is driven, the range in which the guide member 12 slides in the axial direction of the shaft body 11 is the inner surface 6b that forms one end of the guide member 12 and the flow path 6a of the pipe 6. Will be located between. For this reason, the effect which suppresses that the foreign material D which generate | occur | produces with the sliding with the shaft 11 and the guide member 12 flows out downstream of the flow path 6a can be heightened.

  One end of the guide member 12 is movably provided at a first position where it is retracted to the outside of the flow path 6a and a second position where it is flush with the inner surface 6b forming the flow path 6a of the pipe 6. . Note that, at the second position, one end of the guide member 12 may be configured to protrude into the flow path 6a, and the one end exposed to the flow path 6a facilitates the flow of foreign matter accumulated at the one end. Become.

  The first and second seal members 13 and 14 are O-rings. Further, as the first and second seal members 13 and 14, an oil seal, a V packing, a visco seal, or the like may be used.

  With respect to the seal structure 1 configured as described above, the operation of the guide member 12 will be described.

  As shown in FIG. 1, the seal structure 1 has a first wall that is caused by sliding of the shaft body 11 because one end of the guide member 12 is blocked from the flow of the liquid 5 by the cylindrical wall 15. The foreign matter D such as the seal member 13 stays at one end of the guide member 12 and is prevented from flowing out downstream of the flow path 6a.

  When the pipe 6 is not used in the production facility, the guide member 12 is manually moved along the axial direction of the shaft body 11 toward the flow path 6a as shown in FIG. One end of 12 is moved to the inner surface 6b forming the flow path 6a. As a result, one end of the guide member 12 is exposed to the liquid 5 flowing through the flow path 6a, so that the foreign matter D held at one end of the guide member 12 can be forced to flow downstream by the liquid 6a. .

  Further, as shown in FIG. 3, by moving one end of the guide member 12 to a position where the guide member 12 protrudes into the flow path 6a, the flow rate of the liquid 5 in the flow path 6a is relatively low. Exposed to large areas. For this reason, the foreign substance D fastened to one end of the guide member 12 can be more reliably removed by the liquid 6a. Thus, in the seal structure 1, the maintenance work for removing the foreign matter D can be easily performed by moving the guide member 12 in the axial direction of the shaft body 11 as necessary.

  As described above, according to the seal structure 1 of the embodiment, the first seal member is provided at one end of the guide member 12 by including the cylindrical wall 15 that shields one end of the guide member 12 from the flow of the liquid 5. It is possible to prevent foreign matter D, which is wear debris generated by sliding between the shaft 13 and the shaft body 11, from flowing downstream of the flow path 6a. As a result, the quality of the product manufactured by the manufacturing facility using the seal structure 1 can be improved.

  Similarly, according to the seal structure 1, even if the component of the liquid 5 flowing through one end of the guide member 12 and the flow path 6a is solidified, it can be prevented from flowing downstream of the flow path 6a. As a result, the quality of the product manufactured by the manufacturing facility using the seal structure 1 can be improved.

  Further, during maintenance, the guide member 12 is moved in the axial direction of the shaft body 11, and one end of the guide member 12 is positioned inside the flow path 6 a of the pipe 6. The foreign matter D such as deposits adhered to the shaft body 11 due to the solidification of the above components can be exposed to the flow of the liquid 5. Therefore, according to the seal structure 1, the foreign matter D fastened to one end of the guide member 12 can be easily removed without disassembling the seal structure 1 or the pipe 6, and the time required for maintenance work can be reduced.

  Next, another embodiment will be described with reference to the drawings. For convenience of explanation, in other embodiments, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

(Second Embodiment)
In FIG. 4, sectional drawing of the seal structure of 2nd Embodiment is shown. FIG. 5 shows a cross-sectional view for explaining the seal structure of the second embodiment.

  As shown in FIG. 4, the seal structure 2 according to the second embodiment is provided with a guide moving portion 18 as a moving means for moving the guide member 12 in the axial direction with respect to the shaft body 11. This is different from the embodiment.

  The guide moving unit 18 is configured to have a piston and a cylinder similarly to the driving unit 10 described above, and is disposed outside the pipe 6. The guide moving part 18 has a connecting member 19 fixed to the guide member 12. The connecting member 19 is connected to the piston of the guide moving unit 18 via the connecting member 18a.

  According to the seal structure 2 of the second embodiment, when the manufacturing facility using the pipe 6 is not in operation, as shown in FIG. 5, one end of the guide member 12 is formed on the inner surface of the flow path 6a by the guide moving unit 18. By moving to 6b, the operation | movement which removes the foreign material D fastened at the end of the guide member 12 with the liquid 5 which flows through the flow path 6a can be performed automatically.

  Further, according to the seal structure 2 of the second embodiment, as in the first embodiment, the foreign matter D is prevented from flowing out downstream of the flow path 6a, and the foreign matter D held at one end of the guide member 12. The effect which can perform the maintenance operation | work which removes easily is acquired.

(Third embodiment)
FIG. 6 shows a cross-sectional view of the seal structure of the third embodiment. In FIG. 7, sectional drawing for demonstrating the seal structure of 3rd Embodiment is shown.

  As shown in FIG. 6, the seal structure 3 of the third embodiment is configured to block one end of the guide member 12 from the flow of the liquid 5 instead of the cylindrical wall 15 in the first and second embodiments. The point which is provided with the interruption | blocking cylinder 21 as an interruption | blocking member which an end makes | forms a cylindrical wall differs from the above-mentioned 1st and 2nd embodiment.

  The shielding cylinder 21 is formed in a cylindrical shape, and is arranged on the outer peripheral portion of one end of the guide member 12. The shielding cylinder 21 is provided such that one end on the flow path 6a side is movable between a first position protruding inside the flow path 6a and a second position retracting outside the flow path 6a.

  Further, the blocking cylinder 21 has a length from one end on the flow path 6 a side to one end of the guide member 12 longer than the drive stroke of the shaft body 11. Thereby, even when the shaft body 11 slides, the range in which the guide member 12 slides in the axial direction of the shaft body 11 is between the one end of the shielding cylinder 21 and one end of the guide member 12. Will be located. For this reason, the effect which suppresses that the foreign material D which generate | occur | produces with the sliding with the shaft 11 and the guide member 12 flows out from the end of the shielding cylinder 21 to the downstream of the flow path 6a can be heightened.

  Between the guide member 12 and the shaft body 11, the 1st sealing member 23 which seals the flow path 6a is distribute | arranged. Between the shielding cylinder 21 and the guide member 12, the 2nd sealing member 24 which seals the flow path 6a is distribute | arranged. A third seal member 25 is disposed between the shielding cylinder 21 and the opening of the pipe 6.

  Further, the guide member 12 is fixed to the pipe 6 by a fixing member 22, and is configured such that when the shielding cylinder 21 is moved, only the shielding cylinder 21 moves without the guide member 12 moving.

  As shown in FIG. 6, the seal structure 3 has a shaft body because one end of the guide member 12 is blocked from the flow of the liquid 5 by projecting one end of the shielding cylinder 21 into the flow path 6a. The foreign matter D such as the first seal member 13 generated by the sliding of 11 stays at one end of the guide member 12 and is prevented from flowing out downstream of the flow path 6a.

  Further, when the manufacturing facility using the pipe 6 is not in operation, the shielding cylinder 21 is manually moved along the axial direction of the shaft body 11 to the outside of the flow path 6a as shown in FIG. Is moved to the inner surface 6b forming the flow path 6a. As a result, one end of the guide member 12 is exposed to the liquid 5 flowing through the flow path 6a, so that the foreign matter D held at one end of the guide member 12 can be forced to flow downstream by the liquid 6a. .

  According to the seal structure 3 of the third embodiment, by providing the shielding cylinder 21 that shields one end of the guide member 12 from the flow of the liquid 5, similarly to the first embodiment, downstream of the flow path 6a. It is possible to suppress the outflow of the foreign matter D, and to obtain an effect that the maintenance work for removing the foreign matter D held at one end of the guide member 12 can be easily performed.

(Fourth embodiment)
FIG. 8 is a perspective view of the seal structure of the fourth embodiment. FIG. 9 shows a cross-sectional view for explaining the seal structure of the fourth embodiment.

  As shown in FIG. 8, the seal structure 4 of the fourth embodiment is a shield that moves the blocking cylinder 21 as a moving mechanism for moving the blocking cylinder 21 in the axial direction of the shaft body 11 with respect to the guide member 12. The point provided with the cylinder drive part 28 differs from 3rd Embodiment.

  The shielding cylinder drive unit 28 included in the seal structure 4 is configured to have a piston and a cylinder similarly to the drive unit 10 described above, and is disposed outside the pipe 6. The shielding cylinder driving unit 28 has a connecting member 29 fixed to the shielding cylinder 21. The connecting member 29 is connected to the piston of the shielding cylinder driving unit 28 via the connecting member 28a.

  According to the seal structure 4 of the fourth embodiment, when the manufacturing equipment using the pipe 6 is not in operation, the shielding cylinder 21 is moved by the shielding cylinder driving unit 28 as shown in FIG. It is possible to automatically perform the operation of removing the foreign matter D remaining at one end of the liquid with the liquid 5 flowing through the flow path 6a.

  Further, according to the seal structure 4 of the fourth embodiment, as in the third embodiment, the foreign matter D is prevented from flowing out downstream of the flow path 6a, and the foreign matter D held at one end of the guide member 12. The effect which can perform the maintenance operation | work which removes easily is acquired.

DESCRIPTION OF SYMBOLS 1 Seal structure 5 Liquid 6 Piping 6a Flow path 6b Inner surface 10 Drive part 11 Shaft body 12 Guide member 13 1st seal member 14 2nd seal member 15 Cylindrical wall

Claims (7)

A shaft that is arranged across the inside and outside of the flow path through which the liquid flows, and is driven in the flow path;
One end of the flow path is provided opposite to the flow path, and the shaft member is movably supported with respect to the flow path.
A first seal member disposed between the guide member and the shaft and sealing the flow path;
A second seal member disposed between the flow path and the guide member and sealing the flow path;
A sealing structure comprising: a cylindrical wall for blocking the one end of the guide member from the liquid flow. The cylindrical wall is arranged to intersect the flow path,
The one end of the guide member is movable to a first position where the one end is retracted to the outside of the flow path and a second position which is flush with an inner surface forming the flow path or protrudes into the flow path. The seal structure according to claim 1, wherein the seal structure is provided.   The seal structure according to claim 1, wherein the guide member has a distance between the one end and an inner surface forming the flow path longer than a driving stroke of the shaft body.   The seal structure according to any one of claims 1 to 3, further comprising a moving means for moving the guide member in an axial direction with respect to the shaft body. The guide member is disposed on the outer peripheral portion of the one end, and includes a blocking member in which one end on the flow path side forms the cylindrical wall,
The said interruption | blocking member is provided so that the said end can be moved to the 1st position which protrudes inside the said flow path, and the 2nd position which retreats outside the said flow path. Seal structure.   The seal structure according to claim 5, wherein a length from the one end of the blocking member to the one end of the guide member is longer than a drive stroke of the shaft body.   The seal structure according to claim 5 or 6, comprising a moving means for moving the blocking member in the axial direction of the shaft relative to the guide member.

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