Mechanical Seal Device

Abstract

To provide a mechanical seal device which can attach a seal cover accurately while using an adapter.SOLUTION: A mechanical seal device M includes: a rotary seal ring 10 which rotates with a rotary shaft 6; a stationary seal ring 20; and a seal cover 21 which holds the stationary seal ring 20. In the mechanical seal device M, the seal cover 21 is fixed to a rotary machine 5 by using an adapter 30 having a shaft hole 31a into which the rotary shaft 6 can be inserted. A gap G is formed between the seal cover 21 and the adapter 30. The seal cover 21 is fixed to the adapter 30 by fixing means 33, 34.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mechanical seal device, and more particularly to a mechanical seal device in which a seal cover is fixed to a housing of a rotary machine by using an adapter. [Background technology]

[0002] Conventionally, a mechanical seal provided between a rotating shaft of a rotary machine such as a pump or a compressor and a seal cover prevents leakage of a sealed fluid between the rotating shaft and the seal cover by rotating a rotary seal ring and a stationary seal ring relative to each other while keeping their sliding surfaces in close contact with each other. The rotary seal ring is attached to the rotating shaft, and the stationary seal ring is attached to the seal cover. The seal cover is fixed to the housing of the rotary machine by screwing a bolt or the like into a female thread portion provided in advance in the housing. When the female thread portion provided in the housing and the bolt hole of the seal cover are misaligned, an adapter is used to fix the seal cover to the housing of the rotary machine. The adapter is provided with a shaft hole through which the rotating shaft of the rotary machine can be inserted.

[0003] For example, in the mechanical seal device of Patent Document 1, first, an end face of the adapter is brought into contact with an end face of the housing of a rotating machine, and bolts are inserted into bolt holes provided in the adapter and screwed into female threads provided in the housing, thereby fixing the adapter to the housing. Next, the end face of the flange part of the seal cover is brought into contact with the end face of the adapter, and bolts are inserted into bolt holes provided in the seal cover and screwed into female threads provided in the end face of the adapter, thereby fixing the seal cover to the adapter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP-A-11-270698 (pages 3 and 4, Figure 1) Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, the adapter is screwed to the housing, and the seal cover is screwed to the adapter. Therefore, if there are unevenness on the end surfaces of the housing or the adapter, there is a possibility that the mounting angle of the seal cover may be slightly off, or the bolt may not fit properly into the female threaded portion, resulting in a misalignment of the axis of the seal cover, which was originally designed to be aligned with the axis of the rotating shaft, and there is a risk of reducing the sealing performance of the mechanical seal.

[0006] The present invention has been made in view of the above problems, and has an object to provide a mechanical seal device in which a seal cover can be attached with high accuracy while using an adapter. [Means for solving the problem]

[0007] In order to solve the above problems, the mechanical seal device of the present invention comprises: A mechanical seal device comprising: a rotary seal ring that rotates together with a rotary shaft; a stationary seal ring; and a seal cover that holds the stationary seal ring, wherein the seal cover is fixed to a rotary machine using an adapter having a shaft hole through which the rotary shaft can be inserted, A gap is formed between the seal cover and the adapter, The seal cover is fixed to the adapter by a fixing means. According to this, the seal cover can move axially and radially relative to the adapter before being fixed to the rotary machine due to the gap formed between the seal cover and the adapter, so that the seal cover can be fixed to the adapter by the fixing means so that the seal cover is in an appropriate position with the axis aligned with the rotary shaft. This makes it possible to provide a mechanical seal device in which the stationary seal ring is attached to the rotary seal ring with high precision.

[0008] The seal cover and the adapter may be fastened together by a plurality of bolts and nuts, which are the fixing means, provided in a circumferential direction of the seal cover. This makes it easy to fix the seal cover to the adapter at the appropriate angle so as to align the axis with the rotation axis by adjusting the tightening force of multiple bolts and nuts at a position where there is an axial gap between the seal cover and the adapter.

[0009] The adapter may have a number of radially extending segments. This makes it easier to fix the adapter while avoiding unevenness in the rotating machine.

[0010] The piece may have a clearance for inserting the bolt. According to this, since the bolt is movable within the loose insertion portion, it is easy to attach the seal cover to the appropriate position so that the axis is aligned with the rotation axis.

[0011] The seal cover may have a clearance for inserting the bolt. According to this, since the bolt is movable within the loose insertion portion, it is easy to attach the seal cover to the appropriate position so that the axis is aligned with the rotation axis.

[0012] The adapter may comprise a cylindrical body having an axial hole and in contact with the seal cover, and the plurality of pieces extending radially from the cylindrical body. According to this, before being fixed by the fixing means, the cylindrical body and the multiple pieces are separate and can move relative to each other in the axial direction, and when the seal cover is fixed by the fixing means, the tightening force acting on the pieces is less likely to affect the cylindrical body.

[0013] The cylindrical body may have a rotation restricting portion that restricts relative rotation of the pieces. According to this, since the mounting angle of the piece relative to the cylindrical body is determined by the rotation restricting portion before the fixing by the fixing means, the piece can be attached to the seal cover in an appropriate position. Also, after the fixing by the fixing means, the rotation of the cylindrical body to which the seal cover is attached is restricted by the piece.

[0014] The cylindrical body may have an insertion portion that is inserted into a shaft hole of the rotating machine. According to this, the insertion portion abuts against the inner surface of the shaft hole of the rotating machine, thereby restricting the radial movement of the cylindrical body, so that the piece can be attached in the appropriate position using the cylindrical body as a reference. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a mechanical seal device according to an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] 3 is a diagram showing an assembly procedure of the mechanical seal device of the embodiment, in which a cylindrical member is attached to a shaft hole provided in a housing. [Figure 4] 4 is a cross-sectional view taken along line BB in FIG. [Diagram 5] 5A and 5B are diagrams showing the procedure for assembling the mechanical seal device of the embodiment, and Fig. 5 shows how the plate member is fixed to the housing with screws. [Figure 6] 6 is a cross-sectional view taken along CC in FIG. 5. [Figure 7] 7 is a diagram showing the procedure for assembling the mechanical seal device of the embodiment. In addition, Fig. 7 shows how the seal cover is fixed to the adapter with bolts and nuts. [Figure 8] 8 is a cross-sectional view taken along the line DD in FIG. [Figure 9] FIG. 13 is a partially cutaway view for explaining an adapter of a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mechanical seal device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. EXAMPLES

[0017] A mechanical seal device according to an embodiment will be described with reference to Fig. 1 to Fig. 8. In the following description, the left and right sides of Fig. 2 as viewed from the front are taken as the left and right sides of the mechanical seal device. In particular, the left side of the page will be taken as the left side of the mechanical seal device, and the right side of the page will be taken as the right side of the mechanical seal device.

[0018] As shown in Figs. 1 and 2, a mechanical seal device M is provided between a housing 5 and a rotating shaft 6 in a rotary machine to prevent leakage of a sealed fluid in the vicinity.

[0019] The mechanical seal device M is mainly composed of a rotating sealing element 1 and a stationary sealing element 2. The rotating sealing element 1 is sealingly attached to a rotating shaft 6 so as to be rotatable together with the rotating shaft 6. The stationary sealing element 2 is sealingly attached to a housing 5.

[0020] The rotary sealing element 1 is mainly composed of a rotary sealing ring 10, a collar 11, a set screw 12, and O-rings 13 and 14.

[0021] The rotary seal ring 10 is made of carbon and has an annular shape, and its left end surface is a sliding surface 10a.

[0022] An annular recess 10b that is open to the right and inwardly is formed on the inner peripheral surface at the right end of the rotary seal ring 10. An O-ring 13 disposed in the annular recess 10b is pressed against the inner peripheral surface of the annular recess 10b and the outer peripheral surface of the collar 11, providing a tight seal between the rotary seal ring 10 and the collar 11.

[0023] The collar 11 is formed in a cylindrical shape and is fixed to the rotating shaft 6 by a set screw 12.

[0024] An annular groove 11b that is open in the inward direction and recessed in the outward direction is formed on the inner peripheral surface of the collar 11 at the axial center. An O-ring 14 disposed in the annular groove 11b is pressed against the inner peripheral surface of the annular groove 11b and the outer peripheral surface of the rotating shaft 6, sealing the gap between the collar 11 and the rotating shaft 6.

[0025] Additionally, a pin (not shown) is fixed to the left end face of an annular protrusion extending radially outward at the right end of the collar 11. The pin is inserted into a groove (not shown) that is open to the left in the right end face of the rotary seal ring 10. This restricts the rotary seal ring 10 from rotating relative to the collar 11. In other words, the rotary seal ring 10 is rotatable together with the rotary shaft 6. Note that the means for restricting rotation may be a means other than the pin.

[0026] The stationary sealing element 2 is mainly composed of a stationary sealing ring 20, a seal cover 21, an O-ring 22, an elastic member 23, an adapter 30, and gaskets 41 and 42.

[0027] The stationary seal ring 20 is made of filler-containing PTFE (Polytetrafluoroethylene) and is formed in a flanged annular shape. The right end surface of the stationary seal ring 20 is a sliding surface 20a.

[0028] The stationary seal ring 20 has an annular groove 20b that is open in the outer diameter direction and recessed in the inner diameter direction formed on the outer peripheral surface at the left end. An O-ring 22 disposed in the annular groove 20b is pressed against the inner peripheral surface of the annular groove 20b and the inner peripheral surface of the seal cover 21, forming a tight seal between the stationary seal ring 20 and the seal cover 21.

[0029] In addition, an elastic member 23 is fitted from the left side onto the stationary seal ring 20 so as to abut against a left end face of an annular protrusion extending outwardly at the right end. The elastic member 23 is, for example, a coil spring, and presses the stationary seal ring 20 towards the rotating seal ring 10.

[0030] A sliding surface 20a of the stationary seal ring 20 is in pressure contact with the sliding surface 10a of the rotary seal ring 10. This allows the sliding surfaces 10a, 20a to slide relative to each other when the rotary shaft 6 rotates.

[0031] The rotary seal ring 10 and the static seal ring 20 are not limited to those made of a combination of soft materials. Also, materials other than those mentioned above can be used for the rotary seal ring and the static seal ring as long as they are used as sliding materials for mechanical seals, such as ceramics, metal materials, resin materials, composite materials, etc.

[0032] The seal cover 21 is formed in an annular shape with a flange. In this embodiment, the seal cover 21 is fixed to the adapter 30 by a plurality of bolts 33, nuts 34, and washers 35 that serve as fixing means provided in the circumferential direction.

[0033] More specifically, the seal cover 21 is mainly composed of a cylindrical portion 21a and a flange portion 21b. The cylindrical portion 21a is capable of holding the stationary seal ring 20 therein. The flange portion 21b extends radially outward from the left end of the cylindrical portion 21a, and the outer circumferential portion is formed in a substantially rectangular shape.

[0034] In this embodiment, the flange portion 21b has four corners with notches 21d formed therein as loose insertion portions that are open in the outer diameter direction. That is, the four notches 21d are equally spaced in the circumferential direction of the flange portion 21b. The notches 21d extend radially from the vicinity of the outer circumferential surface of the cylindrical portion 21a to the outer circumferential portion of the flange portion 21b.

[0035] In this embodiment, a dimension D21 in the short direction of the cutout 21d is formed to be larger than a diameter D33 of the body of the bolt 33 (D21>D33, see FIG. 1). That is, the body of the bolt 33 is loosely inserted into the cutout 21d.

[0036] Furthermore, an annular recess 21c that is open to the left and inward radial direction is formed on the left end face of the cylindrical portion 21a of the seal cover 21. A gasket 41 disposed in the annular recess 21c is clamped between the side end face of the annular recess 21c and the right end face of the cylindrical member 31 that serves as a cylindrical body constituting the adapter 30, thereby sealing the gap between the seal cover 21 and the adapter 30.

[0037] The gasket 41 is clamped by the force of fastening the seal cover 21 and the adapter 30 with the bolts 33, nuts 34, and washers 35. This force acts in the left direction from the cylindrical portion 21a of the seal cover 21 to the cylindrical member 31 constituting the adapter 30.

[0038] 1 to 6, the adapter 30 is mainly composed of a cylindrical member 31 and four plate members 32 as pieces. That is, in this embodiment, the adapter 30 has a divided structure of the cylindrical member 31 and the four plate members 32.

[0039] The cylindrical member 31 has an axial hole 31a through which the rotating shaft 6 can be inserted, and an annular recess 31b that is open leftward and in the radially outward direction is formed on the outer circumferential surface at the left end of the cylindrical member 31. A gasket 42 is disposed within the annular recess 31b.

[0040] The left end of the inner diameter side of the cylindrical member 31 is a tubular insertion portion 31c, which is fitted into the axial hole 5a of the housing 5. The insertion portion 31c defines the circumferential surface of the annular recess 31b. In other words, the cylindrical member 31 is inserted in a state in which the outer circumferential surface of the insertion portion 31c abuts against the inner circumferential surface of the axial hole 5a of the housing 5, thereby restricting radial movement of the cylindrical member 31. The insertion portion 31c is not limited to being formed in a cylindrical shape, and may be formed of, for example, a plurality of protrusions as long as it abuts against the inner circumferential surface of the axial hole 5a of the housing 5.

[0041] In this embodiment, four guide surfaces 31d are formed on the outer peripheral surface of the cylindrical member 31 as rotation restricting portions. The guide surfaces 31d are flat surfaces, and four guide surfaces 31d are equally spaced in the circumferential direction on the outer peripheral surface of the cylindrical member 31 (see Figs. 3 and 5). The left edge of each guide surface 31d is continuous with the side end surface of the annular recess 31b described above, and extends linearly from the left edge to the right along the axis. The right edge of each guide surface 31d is continuous with the substantially semicircular side end surface of the flange portion 31e extending outwardly from the right end of the cylindrical member 31.

[0042] 5 and 6, the plate member 32 is formed in a substantially rectangular plate shape. The plate member 32 is fixed to the housing 5 by bolts 36 and disposed so as to extend radially from the cylindrical member 31. More specifically, in this embodiment, the plate member 32 is fixed at a predetermined mounting angle to the cylindrical member 31 by abutting its inner diameter side end face against the guide surface 31d of the cylindrical member 31. Furthermore, by abutting the plate member 32 against the guide surface 31d of the cylindrical member 31, the rotation of the cylindrical member 31 is restricted.

[0043] The plate member 32 may be fixed to the housing 5 by the bolts 36 with a part of its inner diameter end face abutting against the guide surface 31d of the cylindrical member 31. The plate member 32 may also be fixed to the housing 5 by the bolts 36 with the inner diameter end face spaced apart in the outer diameter direction from the guide surface 31d of the cylindrical member 31. In this case, the cylindrical member 31 becomes rotatable, but the rotation of the cylindrical member 31 restricts the rotation range of the cylindrical member 31 by abutting a part of the inner diameter end face of the plate member 32 against the guide surface 31d of the cylindrical member 31 upon rotation.

[0044] Further, the plate member 32 has an insertion hole 32a formed at its inner diameter end, through which the bolt 36 can be inserted. The insertion hole 32a is formed in a generally circular shape when viewed in the axial direction, and has generally the same diameter as the body of the bolt 36 (see Figs. 3 and 4). The bolt 36 inserted into the insertion hole 32a from the right side is screwed into a bolt hole 5b formed in the housing 5. The head of the bolt 36 is accommodated in a counterbore 32c formed in the right end face of the plate member 32, so that it does not protrude to the right of the right end face of the plate member 32, or into a gap G, which will be described in detail later.

[0045] Further, the plate member 32 has an insertion hole 32b formed at its outer diameter end as a loose insertion portion through which the bolt 33 can be inserted (see Figs. 5 and 6). In this embodiment, the insertion hole 32b is formed as a so-called long hole having an elliptical shape when viewed in the axial direction, and the dimension D32 of the insertion hole 32b in the short side direction is formed to be larger than the diameter D33 of the body of the bolt 33 (D32>D33, see Fig. 5). That is, the body of the bolt 33 is loosely inserted into the insertion hole 32b.

[0046] Furthermore, the head of the bolt 33 is received in a countersink 32d formed in the left end surface of the plate member 32, so that the head does not protrude beyond the left end surface of the plate member 32 to the left.

[0047] Further, a recess 32e that is open leftward and inwardly is formed at the inner diameter end of the left end face of the plate member 32. The outer diameter end of the gasket 42 is disposed within the recess 32e.

[0048] Further, a gap G is formed in the axial direction between the seal cover 21 and the plate member 32, more specifically, between a portion where the notch 21d is formed in the seal cover 21 and a portion where the insertion hole 32b through which the bolt 33 is inserted is formed in the plate member 32. The body of the bolt 33 is inserted into the gap G.

[0049] Next, a procedure for assembling the mechanical seal device M to the housing 5 will be described.

[0050] First, as shown in Figures 3 and 4, the cylindrical member 31 constituting the adapter 30 is attached to the axial hole 5a of the housing 5. More specifically, with the gasket 42 fitted onto the insertion portion 31c of the cylindrical member 31 from the left side, the insertion portion 31c is inserted into the axial hole 5a of the housing 5 from the right side. At this time, the outer peripheral surface of the insertion portion 31c is guided by the inner peripheral surface of the axial hole 5a of the housing 5. This allows the cylindrical member 31 to be precisely attached to the axial hole 5a of the housing 5 so as to align its axis with the rotation shaft 6.

[0051] At this time, the cylindrical member 31 is inserted to a position where the right end face of the gasket 42 abuts against the side end face of the annular recess 31b of the cylindrical member 31 and the left end face of the gasket 42 abuts against the side end face of the housing 5.

[0052] Furthermore, the cylindrical member 31 is rotated and aligned so that the guide surface 31d of the cylindrical member 31 is aligned with the bolt hole 5b of the housing 5 in the radial direction.

[0053] 5 and 6, the plate member 32 constituting the adapter 30 is fixed to the housing 5 by the bolt 36. More specifically, the bolt 33 is inserted from the left side into the insertion hole 32b formed in the outer diameter end of the plate member 32 so that the body protrudes to the right, and the inner diameter end of the plate member 32 is brought into contact with the guide surface 31d of the cylindrical member 31.

[0054] Thereafter, the plate member 32 is aligned so that the insertion hole 32a formed at the inner diameter end thereof is aligned axially with the bolt hole 5b of the housing 5, and the bolt 36 is inserted into the insertion hole 32a from the right side and screwed into the bolt hole 5b of the housing 5.

[0055] At this time, the outer diameter end of the gasket 42 is clamped and pressed between the side end surface of the recess 32 e of the plate member 32 and the side end surface of the housing 5 .

[0056] In this manner, the mounting angle of the plate member 32 relative to the cylindrical member 31 can be determined simply and accurately by the guide surface 31d of the cylindrical member 31.

[0057] Furthermore, the bolt 33 is loosely inserted into the insertion hole 32b and the countersink 32d formed as long holes, so that the bolt 33 is held movable relative to the plate member 32 even after the plate member 32 is fixed to the housing 5 by the bolt 36.

[0058] Furthermore, even after the plate member 32 is fixed to the housing 5 by the bolts 36, the cylindrical member 31 is still able to move in the axial direction.

[0059] 7 and 8, the seal cover 21 is fixed to the plate member 32 with bolts 33, nuts 34, and washers 35. In this embodiment, the seal cover 21 holds the stationary seal ring 20 with the O-ring 22 and the elastic member 23 interposed therebetween.

[0060] In detail, with the body of the bolt 33 inserted from the left side into the notch 21d formed in the seal cover 21, a washer 35 is inserted into the bolt 33 protruding to the right side of the flange portion 21b of the seal cover 21, and the nut 34 is screwed onto the bolt 33, thereby temporarily fixing the nut 34 to the bolt 33. At this time, the bolt 33 is loosely inserted into the notch 21d, so that the seal cover 21 can move axially and radially relative to the cylindrical member 31 and the plate member 32 that constitute the adapter 30.

[0061] After moving the seal cover 21 to the appropriate position so as to align its axis with the rotating shaft 6, the nut 34 is fully tightened, whereby the flange portion 21b of the seal cover 21 is pressed to the left by the washer 35, and the cylindrical portion 21a of the seal cover 21 is pressed to the left by the cylindrical member 31, thereby fixing the seal cover 21 to the adapter 30.

[0062] At this time, the gasket 41 is clamped between the seal cover 21 and the cylindrical member 31, and the gasket 42 is clamped between the cylindrical member 31 and the housing 5, so that the stationary sealing element 2 is attached to the housing 5 in a hermetically sealed manner.

[0063] At this time, the fastening forces of the bolts 33 and nuts 34 fastening the flange portion 21b of the seal cover 21 to the four plate members 32 can be adjusted so that the seal cover 21 is attached at an appropriate angle.

[0064] Next, the collar 11 holding the rotary seal ring 10 with the O-ring 13 interposed therebetween is attached to the rotating shaft 6. After that, the collar 11 is positioned using a set plate (not shown) or the like so that the sliding surfaces 10a, 20a have an appropriate set load, and is fixed to the rotating shaft 6 with a set screw 12 (see FIG. 2).

[0065] As described above, in the mechanical seal device M of the present invention, the seal cover 21 is movable axially and radially relative to the adapter 30 due to the gap G formed between the seal cover 21 and the adapter 30 before the seal cover 21 is fixed to the housing 5 using the adapter 30, so that the seal cover 21 can be fixed to the adapter 30 with a plurality of bolts 33 and nuts 34 so that the seal cover 21 is in an appropriate position aligned with the rotating shaft 6. This makes it possible to provide a mechanical seal device M in which the stationary seal ring 20 is attached to the rotating seal ring 10 with high precision, and ensures that the sealing performance of the mechanical seal is exhibited.

[0066] Furthermore, by adjusting the tightening forces of the bolts 33 and nuts 34 at a position where there is a gap G in the axial direction between the seal cover 21 and the plate member 32 constituting the adapter 30, it is easy to fix the seal cover 21 to the adapter 30 at an appropriate angle so as to align the axis with the rotating shaft 6. The gap G serves as an inclination allowance for adjusting the mounting angle of the seal cover 21.

[0067] Furthermore, by forming a gap G in the axial direction between the seal cover 21 and the plate member 32 that constitutes the adapter 30, an appropriate tightening force can be applied to the gasket 41 between the seal cover 21 and the cylindrical member 31, thereby ensuring the sealing performance of the gasket 41 in that area.

[0068] Furthermore, compared to a configuration in which a flange is formed in the circumferential direction as in a conventional adapter (see Patent Document 1), the adapter 30 has a plurality of plate members 32 extending radially from the cylindrical member 31 spaced apart in the circumferential direction, making it easier to fix the adapter 30 while avoiding unevenness on the side end surface of the housing 5. In addition, since the portion connecting the plate members 32 in the circumferential direction can be eliminated, the adapter 30 can be made lighter.

[0069] Furthermore, the plate member 32 has an insertion hole 32b into which the bolt 33 can be loosely inserted, and the bolt 33 can move within the insertion hole 32b. Therefore, the seal cover 21 can be easily attached in an appropriate position so as to align the axis with the rotating shaft 6.

[0070] In addition, the plate member 32 is formed with a countersink 32d capable of accommodating the head of the bolt 33, so that the seal cover 21 can be fixed to the adapter 30 with the bolt 33 and nut 34 without interference from the side end surface of the housing 5.

[0071] Moreover, the plate member 32 has a thin plate shape in the axial direction, and is slightly bent and deformed toward the seal cover 21 side where the gap G is formed by receiving the fastening force of the bolts 33 and nuts 34. In other words, since it bends like a beam, it is easy to adjust the seal cover 21 to an appropriate mounting angle.

[0072] Furthermore, the seal cover 21 has a notch 21d into which the bolt 33 can be loosely inserted, and the bolt 33 can move within the notch 21d. Therefore, the seal cover 21 can be easily attached in the correct position so as to align the axis with the rotating shaft 6.

[0073] Furthermore, the adapter 30 is made up of a cylindrical member 31 against which the seal cover 21 abuts, and a plurality of plate members 32 extending radially from the cylindrical member 31, and since the cylindrical member 31 and the plurality of plate members 32 are separate and can move relative to each other in the axial direction before being fixed by the bolts 33 and nuts 34, the tightening force acting on the plate members 32 when the plate members 32 and the seal cover 21 are fastened by the bolts 33 and nuts 34 is unlikely to affect the cylindrical member 31. As a result, the right end face of the cylindrical member 31 that abuts against the seal cover 21 is unlikely to tilt, making it easy to attach the seal cover 21 in an appropriate position so as to align its axis with the rotation shaft 6.

[0074] Furthermore, because the cylindrical member 31 and the plate member 32 are separate members, even if, for example, the number of bolt holes 5b in the housing 5 and the number of notches 21d in the seal cover 21 are different, the adapter 30 and the seal cover 21 can be fastened together by changing to a plate member having corresponding numbers and positions of inner and outer insertion holes.

[0075] Furthermore, because the cylindrical member 31 and the plate member 32 are separate members, even if there is a misalignment in the bolt holes 5b of the housing 5, the plate member 32 can be moved and aligned with the bolt holes 5b of the housing 5, and then fixed with the bolts 36, thereby preventing distortion caused by the fixing of the plate member 32.

[0076] In this way, the adapter 30 is composed of the cylindrical member 31 and the plate member 32, which are separate members, and the body of the bolt 33 that fixes the seal cover 21 to the adapter 30 is loosely inserted into the insertion hole 32b of the plate member 32 and the notch 21d of the seal cover 21, respectively, and is therefore able to accommodate changes in the dimension of the nut seat pitch diameter, or so-called PCD (Pitch Circle Diameter), which is the diameter (pitch circle diameter) of an imaginary circle that passes through the centers of multiple bolts 33.

[0077] In addition, since the cylindrical member 31 and the plate member 32 are separate members, the cylindrical member 31 and the plate member 32 that constitute the adapter 30 have a simple shape and are easy to manufacture.

[0078] Moreover, the cylindrical member 31 has an insertion portion 31c that is inserted into the axial hole 5a of the housing 5, and the outer peripheral surface of the insertion portion 31c abuts against the inner peripheral surface of the axial hole 5a of the housing 5, thereby restricting radial movement of the cylindrical member 31, and therefore the plate member 32 can be attached at an appropriate position based on the cylindrical member 31. Also, the cylindrical member 31 can be attached with high precision to the axial hole 5a of the housing 5 so as to align its axis with the rotating shaft 6. This allows the cylindrical member 31 and the plate member 32 to come into accurate contact with the gasket 42, thereby improving sealing performance.

[0079] Furthermore, since the mounting angle of the plate member 32 relative to the cylindrical member 31 is determined by the guide surface 31d of the cylindrical member 31 before fixing with the bolts 33 and nuts 34, the plate member 32 can be mounted in an appropriate position relative to the seal cover 21. Furthermore, the provision of the guide surface 31d eliminates the need for a dedicated tool such as a level when mounting the plate member 32. Furthermore, after fixing with the bolts 33 and nuts 34, the rotation of the cylindrical member 31 to which the seal cover 21 is mounted is restricted by the plate member 32.

[0080] Furthermore, the cylindrical member 31 has a flange portion 31e at its right end against which the seal cover 21 abuts, and when the plate member 32 is attached, the plate member 32 abuts against the flange portion 31e in a temporarily placed state, thereby preventing the plate member 32 from slipping out in the axial direction. Even if the bolt 36 becomes loose after the mechanical seal device M is attached, the plate member 32 abuts against the flange portion 31e, thereby preventing the plate member 32 from loosening.

[0081] Incidentally, the rotation restricting portion is not limited to a flat surface such as the above-mentioned guide surface 31d, and may be formed as a guide groove 131d recessed in the inner diameter direction on the outer circumferential surface of the cylindrical member 31 as shown in Fig. 9. With this, when attaching the plate member 32, the plate member 32 is easily held in a state inserted in the guide groove 131d, and is easily fixed to the housing 5 by the bolt 36. Also, the plate member 32 is easily attached with high accuracy to an appropriate position in the guide groove 131d.

[0082] Furthermore, the insertion holes 32a through which the bolts 36 for fixing the plate member 32 to the housing 5 are inserted are provided on the inner diameter side of the insertion holes 32b through which the bolts 33 for fastening the plate member 32 and the seal cover 21 are inserted. As a result, even if the radial dimension at the side end face of the housing 5 is smaller than, for example, the outer diameter dimension of the seal cover 21, the seal cover 21 can be fixed to the housing 5 using the adapter 30.

[0083] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0084] For example, in the above embodiment, a so-called static mechanical seal in which a coil spring is included in the stationary sealing element has been described, but this is not limited thereto, and the seal may be a so-called rotary mechanical seal in which a coil spring is included in the rotating sealing element.

[0085] In addition, in the above embodiment, the adapter is described as being constructed of a cylindrical member and a plate member which are separate members, but this is not limited thereto, and the adapter may be constructed of a cylindrical member and a plate member which are integrally formed.

[0086] Furthermore, the notches in the seal cover, the guide surface of the cylindrical member, and the plate member are not limited to being evenly spaced, but may be arranged in a plurality in the circumferential direction, and may be freely configured in number as long as they can be aligned with the insertion holes in the plate member for fastening to the housing and the bolt holes in the housing, and with the insertion holes in the plate member for fastening to the seal cover and the notches in the seal cover. The mechanical seal device of the present invention is applicable even if the number of notches in the seal cover and the number of bolt holes in the housing are different. For example, if the seal cover has four notches compared to three bolt holes in the housing, one plate member can be provided with one insertion hole for fixing to the housing and two insertion holes for fixing to the seal cover, and two plate members can be provided with one insertion hole for fixing to the housing and one insertion hole for fixing to the seal cover.The three guide surfaces of the cylindrical member and the three plate members can be positioned at positions corresponding to the three bolt holes in the housing and the plate members can be fixed to the housing with bolts.The four cutouts in the seal cover can then be aligned with the total of four insertion holes formed in the three plate members, and the seal cover can be fixed to the housing with bolts and nuts.

[0087] The plate member may also be fixed in the circumferential direction by a plurality of bolts.

[0088] Furthermore, the pieces that make up the adapter are not limited to being plate-shaped, and may be block bodies such as cubes, spheres, etc. By making the pieces axially thin in a plate shape as in the above embodiment, the strength of the pieces is ensured while the pieces are easily bent and deformed by the tightening force of the bolts and nuts that serve as fixing means.

[0089] Furthermore, the bolt insertion portion formed in the plate member is not limited to an elongated hole, but may be a notch, etc. By forming the bolt as an elongated hole as in the above embodiment, the bolt as a fixing means is less likely to fall off during assembly.

[0090] Furthermore, the bolt insertion portion formed in the seal cover is not limited to a notch, but may be a long hole, etc. By using a notch as in the above embodiment, the fixing position of the bolt / nut as the fixing means can be easily moved within the range of the notch, so that it can be widely used regardless of the shape of the rotating machine.

[0091] Furthermore, the fixing means does not have to include a washer as long as the adapter and the seal cover can be fastened together by bolts and nuts. Furthermore, the fixing means may be a fastener other than bolts and nuts. [Explanation of symbols]

[0092] 1 Rotating sealing element 2 Stationary sealing elements 5 Housing (rotating machinery) 5a shaft hole 5b Bolt hole 6 Rotation Axis 10 Rotary seal ring 10a Sliding surface 11 Color 20 Stationary sealing ring 20a Sliding surface 21 Seal cover 21d Cutout (insertion area) 30 Adapter 31 Cylindrical member (tubular body) 31a Shaft hole 31c Insertion part 31d Guide surface (rotation control part) 31e Flange 32 Plate member (piece) 32a Insertion hole 32b Insertion hole (loose insertion part) 32c,32d counterbore 33 Bolt (fixing means) 34 Nut (fixing means) 35 Washer 36 Volts 41,42 Gasket 131d Guide groove (rotation restriction part) G Gap M Mechanical seal device

Claims

1. A mechanical seal device comprising: a rotary seal ring that rotates together with a rotary shaft; a stationary seal ring; and a seal cover that holds the stationary seal ring, wherein the seal cover is fixed to a rotary machine using an adapter having a shaft hole through which the rotary shaft can be inserted, A gap is formed between the seal cover and the adapter, The seal cover is fixed to the adapter by a fixing means, forming a mechanical seal device.

2. 2. The mechanical seal device according to claim 1, wherein the seal cover and the adapter are fastened together by a plurality of bolts and nuts, which are the fixing means, provided in a circumferential direction of the seal cover.

3. 3. The mechanical seal device according to claim 2, wherein the adapter has a plurality of radially extending segments.

4. 4. The mechanical seal device according to claim 3, wherein the piece has a clearance for receiving the bolt.

5. 5. The mechanical seal device according to claim 3, wherein the seal cover has a clearance for receiving the bolt.

6. 6. The mechanical seal device according to claim 3, wherein the adapter comprises a cylindrical body having an axial hole and against which the seal cover abuts, and the plurality of pieces extending radially from the cylindrical body.

7. 7. The mechanical seal device according to claim 6, wherein the cylindrical body has a rotation restricting portion that restricts relative rotation of the pieces.

8. 8. The mechanical seal device according to claim 6, wherein the cylindrical body has an insertion portion that is inserted into a shaft hole of the rotary machine.

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