Seal structure for rotating equipment and assembly method for rotating equipment

Abstract

To provide a seal structure of a rotary device which facilitates assembly work of a lip seal to achieve high air-tightness and a long life of the seal structure.SOLUTION: A seal structure of a rotary device includes: a lip seal 11 into which a rotary shaft 2 of a biaxial continuous type kneading machine 1 is inserted and which seals a space between a packing box 12 and an outer periphery of the rotating rotary shaft 2; the packing box 12 which has a rotary shaft insertion hole 13 into which the rotary shaft 2 is inserted and which houses the lip seal 11 in a state that the lip seal 11 cannot rotate; an annular adapter 11c which is fixed to the packing box 12 and sandwiches the lip seal 11 from both axial sides; a packing pressing member 15 which presses the annular adapter 11c and the lip seal 11 to a peripheral edge of the rotary shaft insertion hole 13 of the packing box 12; and a seal cover 14 which forms a cover side rotary shaft insertion hole 14a at the opposite side of the packing pressing member 15 in the packing box 12. The seal cover 14 is detachably attached to the packing box 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a seal structure for a rotating device, including a lip seal that is an airtight shaft seal for a rotating device such as a reactor or a kneader, and to a method for assembling the rotating device. [Background technology]

[0002] 8, a seal structure 210 for a rotating device is known in which a rotating shaft 202 is sealed by a first seal device that presses a gland packing 216 with a packing gland 215 and a second seal device that has an airtightness maintaining function, and a space 217 is provided between the first seal device and the second seal device (see, for example, Patent Document 1). This seal structure 210 includes a gland packing 216 as the first seal device and a lip seal 211 as the second seal device, and the lip seal 211 is pressed by the packing gland 215. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3509613 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional seal structure 210 of a rotating device, when the lip seal 211 is pressed by the packing gland 215, the assembly direction is determined in the axial direction, making it difficult to properly assemble the lip seal 211 deep inside the packing box 212.

[0005] In particular, depending on the specifications of the direction of the tip of the sliding contact piece 211b of the lip seal 211 facing inward in the radial direction, the sliding contact piece 211b may be deformed in the opposite direction due to the assembly reaction force.

[0006] Furthermore, the gap L1' between the rotating shaft 202 and the rotating shaft insertion hole 213 of the packing box 212 through which the rotating shaft 202 is inserted is extremely small, which poses a problem in that it is not possible to visually or tactilely confirm whether the sliding contact piece 211b of the lip seal 211 is correctly assembled.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to facilitate the assembly work of a lip seal and to achieve a high level of airtightness and a long life for the seal structure. [Means for solving the problem]

[0008] In order to achieve the above object, in the present invention, a part of the wall portion of the packing box having the rotary shaft insertion hole is made into a detachable seal cover.

[0009] Specifically, in the first invention, a lip seal through which a rotating shaft of a rotating device is inserted and which seals between the lip seal and an outer periphery of the rotating shaft; a packing box having a rotary shaft insertion hole through which the rotary shaft is inserted and accommodating the lip seal in a non-rotatable state; a seal cover that constitutes a wall portion of the packing box and defines a cover-side rotating shaft insertion hole through which the rotating shaft is inserted; a packing pressing member that presses the lip seal against the seal cover; Equipped with The seal cover is configured to be detachable from the packing box.

[0010] According to the above-described seal structure for a rotary machine, the seal cover having the cover-side rotating shaft insertion hole can be detached from the packing box, and by removing the seal cover to expose the lip seal, it is possible to easily check whether the lip seal is properly installed, even from a direction that was previously difficult to check. This makes it easy and reliable to install the lip seal.

[0011] In the second invention, in the first invention, The lip seal is an annular lip seal body; At least one pair of annular sliding contact pieces are fitted into the lip seal body, and have radially inwardly directed tips that extend so as to be bent in either axial direction, and are in sliding contact with the outer periphery of the rotating shaft, The lip seal body includes annular adapters on both axial sides, and the annular adapters are configured to be detachable.

[0012] According to the above-described seal structure for a rotary machine, after the lip seal is attached to the rotating shaft, the seal cover is removed, the annular adapter is removed to expose the lip seal, and it is possible to easily check whether the lip seal has been attached correctly.

[0013] In the third invention, in the second invention, the rotating device is a twin-shaft continuous kneader having a pair of rotating shafts, The seal cover has a pair of cover-side rotary shaft insertion holes arranged at an interval, The radial length of the gap between the periphery of the cover-side rotary shaft insertion hole and the outer periphery of the rotary shaft is shorter than the radial length of the annular adapter.

[0014] According to the above-described seal structure of the rotary machine, when the seal cover is in place, the radial length of the gap between the periphery of the rotating shaft insertion hole and the outer periphery of the rotating shaft is insufficient, making it difficult to inspect the lip seal. However, when the seal cover is removed, the annular adapter can also be attached and detached, making it easy and reliable to install the lip seal even in rotating equipment in which a pair of rotating shafts are arranged in a narrow space.

[0015] In a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, The packing box is provided with an openable and closable inspection window that exposes the periphery of the cover-side rotary shaft insertion hole of the seal cover.

[0016] According to the above-described seal structure for a rotary machine, the lip seal can be easily inspected and installed with the inspection window open and the seal cover removed.

[0017] In a method for assembling a rotating device according to a fifth aspect of the present invention, Insert the rotating shaft into the rotating shaft insertion hole of the packing box, a lip seal that seals between the rotating shaft and the outer periphery of the rotating shaft as it rotates is fitted onto one end of the rotating shaft that is inserted into the rotating shaft insertion hole, together with an annular adapter that sandwiches the lip seal from both sides in the axial direction; Remove the annular adapter and check visually or by touch whether the lip seal is properly fitted, then return the annular adapter; a seal cover forming a cover-side rotary shaft insertion hole is fixed to the packing box; a packing pressing member is fixed to the packing box so as to press the annular adapter and the lip seal against the seal cover; The packing box is configured to be fixed to the body of the rotating device.

[0018] According to the above configuration, the seal cover having the cover-side rotating shaft insertion hole can be attached and detached from the packing box, so that by removing the seal cover and exposing the lip seal, it is possible to easily check whether the lip seal is properly attached, even from a direction that was previously difficult to check. This makes it possible to attach the lip seal easily and reliably, resulting in the assembly of high-quality rotating equipment. [Effects of the Invention]

[0019] As described above, according to the present invention, by removing the seal cover, the installation work of the lip seal can be facilitated, and the seal structure can be made more airtight and have a longer life. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view showing an overview of a rotary machine including a seal structure for a rotary device according to a first embodiment of the present invention. [Figure 2] 2 is an enlarged cross-sectional view of a portion II in FIG. 1, showing an enlarged view of the seal structure of the rotary machine according to the first embodiment of the present invention. FIG. [Figure 3]FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 3 is an enlarged cross-sectional view of a portion IV in FIG. 2. [Figure 5] FIG. 5 is an enlarged cross-sectional view showing a seal structure of a rotary machine according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. 7 is an enlarged cross-sectional view of part VII in FIG. 5. [Figure 8] FIG. 6 is a cross-sectional view equivalent to FIG. 5, showing a seal structure for a rotating device according to a conventional technique. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] (Embodiment 1) 1 shows a twin-shaft continuous kneader 1 as a rotary machine including a seal structure 10 for a rotary device according to a first embodiment of the present invention, and this twin-shaft continuous kneader 1 has a rotary shaft 2, which is rotatably supported by a body 4 of the twin-shaft continuous kneader 1. Raw material S is fed through a raw material inlet 4a of the body 4, and is kneaded by a stirring blade 3 of the rotary shaft 2 while moving toward a product outlet 4b, and the kneaded product S' is discharged from the product outlet 4b.

[0023] For example, the raw material S to be kneaded includes polyacetal, polyamide, polyurethane, etc. in the polymerization and reaction of engineering plastics, epoxy, polyamide, polyester, etc. in the kneading of plastics, sealants, powder paints, etc. in the kneading of chemical industrial products, and battery raw materials, ceramics, carbon, EMC (epoxy molding compound), etc. in the kneading of electronic parts.

[0024] The rotating shaft 2 is rotatably supported by bearings 5 ​​at both ends and is driven to rotate by an electric motor 6 at one end. The raw material S in the body 4 may generate gas, such as an organic solvent, and is airtightly sealed by a seal structure 10.

[0025] As shown enlarged in FIG. 2, the seal structure 10 has a lip seal 11 through which the rotary shaft 2 of the twin-screw continuous kneader 1 is inserted, and which seals the gap with the outer periphery of the rotating rotary shaft 2.

[0026] As shown in Figure 4, the lip seal 11, also known as a Wilson seal, includes an annular lip seal body 11a and a pair of annular sliding contact pieces 11b fitted into the lip seal body 11a, with their radially inward tips bending in either axial direction and in sliding contact with the outer periphery of the rotating shaft 2. The lip seal body 11a includes annular adapters 11c on both axial sides, which are detachable. The distance between the pair of sliding contact pieces 11b is adjusted by annular spacers 11d of the lip seal body, and oil may be supplied through the annular spacers 11d.

[0027] The sliding contact pieces 11b are made of, for example, fluororubber, which has excellent oil resistance, chemical resistance, heat resistance, flame resistance, weather resistance, ozone resistance, etc., but may be made of other materials. In this embodiment, the pair of sliding contact pieces 11b extend so as to approach each other in the radial direction, but for example, three or more sliding contact pieces 11b may be lined up, and the bending direction of the tip can be changed according to the design in accordance with the internal pressure, external pressure, etc.

[0028] The pair of annular adapters 11c are made of, for example, but not limited to, SUS316L. Each annular adapter 11c is detachably attached to an annular spacer 11d, which adjusts the gap between the base sides of the pair of sliding contact pieces 11b of the lip seal body 11a. O-rings (not shown) may be fitted onto the outer circumferential surfaces of the annular adapters 11c and the annular spacer 11d.

[0029] The seal structure 10 has a rotary shaft insertion hole 13 through which the rotary shaft 2 is inserted, and is provided with a packing box 12 that houses the lip seal 11 in a non-rotatable state. The packing box 12 is made of a rectangular box body made of, for example, a stainless steel plate, and its flange portion 12a can be connected to the body 4.

[0030] The seal structure 10 includes a packing pressing member 15 that presses the lip seal 11 against the periphery of the rotary shaft insertion hole 13 of the packing box 12. The packing pressing member 15 is made of a cylindrical stainless steel plate or the like having a flange portion 15a whose outer diameter is larger than the inner diameter of the rotary shaft insertion hole 13, and the outer diameter of the cylindrical portion 15b is slightly smaller than the inner diameter of the rotary shaft insertion hole 13. By appropriately sequentially tightening a plurality of pressing bolts 15c attached to the flange portion 15a at predetermined intervals in the circumferential direction, the packing pressing member 15 can press the lip seal 11 together with the gland packing 16 with an appropriate force in the axial direction.

[0031] As shown in FIG. 4, the seal structure 10 includes a seal cover 14 that forms a cover-side rotating shaft insertion hole 14a on the side of the packing box 12 opposite the packing pressing member 15. This seal cover 14 forms a part of the wall of the packing box 12 and is configured to be detachable from the packing box 12. The twin-shaft continuous mixer 1 of this embodiment is a twin-shaft continuous mixer 1 having a pair of rotating shafts 2, and as shown in FIG. 3, a pair of cover-side rotating shaft insertion holes 14a are arranged at a distance from each other in the seal cover 14. The seal cover 14 is made of, for example, an oval stainless steel plate member, and can be detachably fixed to the packing box 12 by fastening cover mounting bolts 14b arranged around the outer periphery into screw holes formed in the packing box 12.

[0032] Although details will be described later, by configuring the seal cover 14 to be detachable, the lip seal 11 can be inserted from either direction in the axial direction of the rotary shaft 2, as shown in FIG.

[0033] - Rotating equipment assembly method - Next, a method for assembling the twin-screw continuous kneader 1 according to this embodiment will be described.

[0034] First, the rotating shafts 2 are inserted into the pair of rotating shaft insertion holes 13 of the packing box 12. There is no particular limitation on the timing at which the second rotating shaft 2 is inserted after the first rotating shaft 2 has been inserted. The direction in which the rotating shafts 2 are inserted is determined in relation to the assembly of the bearing unit 5, the electric motor 6, etc.

[0035] Next, the lip seal 11 is fitted from one end onto the rotating shaft 2 inserted into the rotating shaft insertion hole 13, together with the annular adapters 11c that sandwich it from both axial sides. Unlike the conventional method, this embodiment has the advantage that the seal cover 14 is configured to be detachable from the packing box 12, so the lip seal 11 can be inserted from either axial direction.

[0036] After the lip seal 11 is assembled, the annular adapter 11c is removed and the lip seal 11 is checked visually or by touch to see if it is properly fitted. This checking can be done from either the axial direction. After checking, the annular adapter 11c is returned. Then, the gland packing 16 is positioned inside the rotating shaft insertion hole 13. Alternatively, the lip seal 11 may be positioned inside the rotating shaft insertion hole 13 from the side where the packing pressing member 15 is inserted after the gland packing 16 is positioned inside the rotating shaft insertion hole 13.

[0037] In this way, in this embodiment, after the lip seal 11 is attached to the rotating shaft 2, the seal cover 14 is removed, the annular adapter 11c is removed to expose the lip seal, and it is possible to easily check whether the lip seal 11 has been attached correctly.

[0038] Next, the seal cover 14, which forms the cover-side rotary shaft insertion hole 14a, is fixed to the packing box 12 with the cover mounting bolts 14b. As shown in FIG. 4, when the seal cover 14 is fixed, the radial length L1 of the gap between the periphery of the cover-side rotary shaft insertion hole 14a and the outer periphery of the rotary shaft 2 is shorter than the radial length L2 of the annular adapter 11c (L1 <L2)。

[0039] Next, the annular adapter 11c and the lip seal 11 are pressed against the seal cover 14, and the pressure bolts 15c provided on the flange portion 15a of the packing pressure member are sequentially tightened, thereby fixing the packing pressure member 15 to the packing box 12 with an appropriate tightening force.

[0040] Then, the packing box 12 to which the seal structure 10 is assembled is fastened to the body 4.

[0041] This completes the assembly of the seal structure 10. After that, the other parts of the twin-screw continuous kneader 1 are assembled.

[0042] In this way, in this embodiment, the seal cover 14 having the rotary shaft insertion hole 13 can be attached and detached from the packing box 12, so by removing the seal cover 14 to expose the lip seal 11, it can be easily confirmed whether the lip seal 11 is attached correctly. Therefore, the lip seal 11 can be attached easily and reliably.

[0043] In this embodiment, even in a twin-shaft continuous kneader 1 in which a pair of rotating shafts 2 are arranged in a narrow space, the lip seal 11 can be easily and reliably installed by attaching and detaching the seal cover 14.

[0044] Therefore, according to the seal structure 10 for a rotating device of this embodiment, by removing the seal cover 14, the installation work of the lip seal 11 can be facilitated, and the seal structure can be made more airtight and have a longer life.

[0045] (Embodiment 2) 5 to 7 show a seal structure 110 for a rotary machine according to a second embodiment of the present invention, which differs from the first embodiment in that the gland packing 16 and the lip seal 11 are provided at positions separated from each other within a packing box 112 and the shape of the seal cover 114 is different. In this embodiment, the same parts as those in Figs. 1 to 4 are designated by the same reference numerals and detailed description thereof will be omitted.

[0046] In the seal structure 110 for a rotating device of this embodiment, a space 117 is provided between the gland packing 16 and the lip seal 11 inside a rectangular parallelepiped packing box 112. The packing box 112 is provided with an openable inspection window 118 that exposes the periphery of the rotating shaft insertion hole 13 of the seal cover 114. The inspection window 118 has rectangular openings provided at the top and bottom of the packing box 112, and can be opened and closed by a rectangular plate-shaped cover member 112a.

[0047] Even when this inspection window 118 is provided, as shown in FIG. 8, in the conventional seal structure 210, the gap L1′ between the rotating shaft 202 and the rotating shaft insertion hole 213 of the packing box 212 through which the rotating shaft 202 is inserted is very small, so it is not possible to visually check whether the sliding contact piece 211b of the lip seal 211 is correctly assembled.

[0048] However, in this embodiment, an openable and closable seal cover 114 having a cover-side rotating shaft insertion hole 114a is provided as in the first embodiment, and the seal cover 114 can be attached and detached from the packing box 112. Therefore, by removing the seal cover 114 to expose the lip seal 11, it can be easily confirmed whether the lip seal 11 is properly attached.

[0049] In this embodiment, the seal cover 114 is attached or detached by removing at least one of the upper and lower cover members 112a.

[0050] Other than that, the present embodiment is the same as the first embodiment, and therefore a description of the assembly procedure of the seal structure 10 for a rotating device of the present embodiment will be omitted.

[0051] In this embodiment, the lip seal 11 can be inspected and attached with the inspection window 118 open, which provides excellent workability.

[0052] Therefore, in the seal structure 110 for a rotating device according to this embodiment, by removing the seal cover 14, the installation work of the lip seal 11 can be facilitated, and the seal structure can be made more airtight and have a longer life.

[0053] It should be noted that the above-described embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0054] 1. Twin-screw continuous mixer (rotating equipment) 2 rotation axes 3 stirring blades 4. Torso 4a Raw material input port 4b Product outlet 5 Bearing section 6 electric motor 10. Seal structure 11 Lip seal 11a Lip seal body 11b Sliding piece 11c Circular Adapter 11d Annular spacer 12 Packing box 13 Rotating shaft insertion hole 14 Seal cover 14a Cover side rotating shaft insertion hole 14b Cover mounting bolt 15 Packing pressing member 15a Flange 15b Cylindrical part 15c Press bolt 16 Gland packing 110 Seal structure 112 Packing box 112a Cover member 114 Seal cover 117 Space room 118 Inspection window 202 Rotation axis 210 Seal Structure 211 Lip seal 211b Sliding piece 212 Packing box 213 Rotating shaft insertion hole 215 Packing gland 216 Gland packing 217 Space room

Claims

1. a lip seal through which a rotating shaft of a rotating device is inserted and which seals between the lip seal and an outer periphery of the rotating shaft; a packing box having a rotary shaft insertion hole through which the rotary shaft is inserted and accommodating the lip seal in a non-rotatable state; a seal cover that constitutes a wall portion of the packing box and defines a cover-side rotating shaft insertion hole through which the rotating shaft is inserted; a packing pressing member that presses the lip seal against the seal cover; Equipped with The lip seal is an annular lip seal body; At least one pair of annular sliding contact pieces are fitted into the lip seal body, and have radially inwardly directed tips that extend so as to be bent in either axial direction, and are in sliding contact with the outer periphery of the rotating shaft, The seal cover is configured to be detachable from the packing box, The lip seal body includes an annular spacer positioned between the pair of sliding contact pieces, and an annular adapter positioned so as to sandwich the pair of sliding contact pieces between the annular spacer and the pair of sliding contact pieces, and the annular adapter is configured to be detachable from the annular spacer and the pair of sliding contact pieces. A seal structure for a rotating device characterized by:

2. the rotating device is a twin-shaft continuous kneader having a pair of rotating shafts, The seal cover has a pair of cover-side rotary shaft insertion holes arranged at an interval, The radial length of a gap between the periphery of the cover-side rotary shaft insertion hole and the outer periphery of the rotary shaft is shorter than the radial length of the annular adapter. The seal structure for a rotating device according to claim 1 .

3. The packing box is provided with an openable and closable inspection window that exposes the periphery of the cover-side rotary shaft insertion hole of the seal cover.

3. The seal structure for a rotating device according to claim 1 or 2.

4. A seal structure for a rotating device according to claim 1 is provided, The rotary shaft is inserted into the rotary shaft insertion hole of the packing box, The lip seal is fitted onto the rotary shaft inserted into the rotary shaft insertion hole from one end side, With the seal cover and the annular adapter removed, visually or tactilely check whether the lip seal is properly attached, and then return the annular adapter; a seal cover that forms the cover-side rotary shaft insertion hole is fixed to the packing box; The packing pressing member is fixed to the packing box so as to press the lip seal against the seal cover, The packing box is fixed to the body of the rotating equipment. A method for assembling a rotating device comprising:

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