CN110966409B - Mechanical sealing element - Google Patents
Mechanical sealing element Download PDFInfo
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- CN110966409B CN110966409B CN201910902913.5A CN201910902913A CN110966409B CN 110966409 B CN110966409 B CN 110966409B CN 201910902913 A CN201910902913 A CN 201910902913A CN 110966409 B CN110966409 B CN 110966409B
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- Prior art keywords
- sleeve
- mechanical seal
- ring
- rotating
- rotating shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3452—Pressing means the pressing force resulting from the action of a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3464—Mounting of the seal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/36—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member connected by a diaphragm or bellow to the other member
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
The invention provides a mechanical seal capable of adjusting the force applied by a force applying unit between the sliding end surfaces of a rotating ring and a static ring with high precision. A mechanical seal (1) is provided with: a seal cover (7) mounted to a housing (2) of the fluid device; a sleeve (15) externally sleeved on the rotating shaft (3) of the fluid equipment; a rotating ring (5) which is attached to the rotating shaft (3) via a sleeve (15) and rotates together with the rotating shaft (3); a stationary ring (4) which is held inside the seal cover (7) and forms a sliding connection part together with the rotating ring (5); a biasing unit (9) that biases the rotating ring (5) and the stationary ring (4) in the opposing direction; and a ring-shaped sleeve (17) externally inserted into the sleeve (15), wherein the sleeve (15) and the rotating shaft (3) are fixed by a fixing screw (18) screwed with a screw hole (20a) formed in the sleeve (17), and in the mechanical seal (1), the inner diameter (alpha phi) of an externally inserted part (17b) of the sleeve (17) externally inserted into the sleeve (15) is formed smaller than the outer diameter (beta phi) of the sleeve (15).
Description
Technical Field
The present invention relates to a mechanical seal used as a shaft seal member such as a drive shaft of a fluid device.
Background
The mechanical seal is used by being assembled between a housing of a fluid device and a rotating shaft disposed so as to penetrate the housing, and the stationary ring fixed to the housing of the fluid device and the rotating ring rotating together with the rotating shaft are urged in the axial direction by urging means, so that sliding end surfaces of the stationary ring and the rotating ring are brought into sliding contact with each other, thereby forming a sliding contact portion, whereby leakage of a fluid from the inside to the outside or from the outside to the inside of the fluid device is prevented.
In such a mechanical seal, a stationary ring is held inside a seal cover attached to a housing of a fluid device, a rotating ring is attached to a sleeve fitted around a rotating shaft to rotate together with the rotating shaft, and the sleeve is fixed to the rotating shaft to be installed in the fluid device. For example, in patent document 1, an annular sleeve is loosely fitted around a sleeve, a through hole penetrating in a radial direction is formed in the sleeve, a screw hole is formed in the sleeve, and the screw hole is tightened with a fixing screw in a state where the through hole and the screw hole are communicated, so that a tip end of the fixing screw is pressed against an outer surface of a rotating shaft through the through hole, thereby fixing the sleeve to the rotating shaft.
In addition, as a step of installing such a mechanical seal, a seal cover is first fixed to a housing of a fluid device by fixing means such as screws, and a sleeve in a state where the seal cover is loosely fitted is fitted around a rotating shaft. In this state, the relative positions of the sleeve and the rotary shaft are adjusted to adjust the biasing force of the biasing means acting between the stationary ring and the sliding end surface of the rotary ring, and then the tip of the fixing screw is pressed against the outer surface of the rotary shaft. When the biasing force of the biasing means is adjusted, a fastener having a predetermined thickness is inserted between the sleeve and the seal cover to move the sleeve. At this time, the screw hole of the sleeve is screwed with the fixing screw so that the distal end portion does not abut against the rotary shaft, and the distal end side of the fixing screw is engaged with the through hole of the sleeve, whereby the sleeve is moved in accordance with the movement of the sleeve.
[ patent document 1 ] U.S. Pat. No. 6729622
The through hole of the sleeve has a slightly extra inner diameter with respect to the outer periphery of the fixing screw so that the fixing screw can be inserted therethrough. Therefore, there is a problem that the distal end portion of the fixing screw is locked at a position offset in the axial direction with respect to the through hole, and the through hole and the center axis of the fixing screw may be axially displaced, and when the fastener moves the sleeve, the amounts of movement of the sleeve and the sleeve do not match, and the biasing force of the biasing means cannot be adjusted with high accuracy.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object thereof is to provide a mechanical seal capable of accurately adjusting the biasing force of a biasing means acting between the sliding end surfaces of a rotating ring and a stationary ring.
In order to solve the above problem, a mechanical seal according to the present invention includes: a seal housing mounted to a housing of the fluid device; the sleeve is sleeved on the rotating shaft of the fluid device; a rotating ring attached to the rotating shaft via the sleeve and rotating together with the rotating shaft; a stationary ring held inside the seal cover and forming a sliding contact portion together with the rotating ring; a biasing unit that biases the rotating ring and the stationary ring in opposite directions; and a ring-shaped sleeve externally inserted into the sleeve, the sleeve and the rotating shaft being fixed by a fixing screw screwed into a screw hole formed in the sleeve, wherein an inner diameter of an externally inserted portion of the sleeve externally inserted into the sleeve is formed smaller than an outer diameter of the sleeve.
According to this feature, since the inner diameter of the outer insertion portion of the sleeve is smaller than the outer diameter of the sleeve, when the sleeve is inserted into the sleeve, the sleeve presses the outer peripheries of the sleeve and the sleeve, and relative movement between the sleeve and the sleeve is restricted. Therefore, when the fastener moves the sleeve, the movement amounts of the sleeve and the sleeve are matched, and the biasing force of the biasing means can be adjusted with high accuracy.
Preferably, the sleeve has a taper expanding in an outward direction in the socket of at least one opening in the axial direction.
Accordingly, the sleeve is guided by the taper provided in the socket of the opening of the sleeve, and therefore the sleeve can be easily pressed and fitted.
Preferably, the inner circumferential surface of the sleeve is circular.
Accordingly, the contact area between the sleeve and the sleeve can be secured over a large area, and the coupling force therebetween is high.
Preferably, the sleeve includes a protruding portion protruding from a main body portion in a direction facing the seal cover, and a gap is formed between facing surfaces of the main body portion of the sleeve and the seal cover in a state where the protruding portion is in contact with the seal cover.
Thus, the fastening tool can be easily inserted into the gap formed between the main body of the sleeve and the facing surface of the seal cover.
Preferably, the through hole formed in the sleeve and communicating with the screw hole is formed larger at least in the circumferential direction than the screw hole formed in the sleeve.
Accordingly, the through hole formed in the sleeve and the screw hole formed in the sleeve are easily communicated in the radial direction, and high operation precision is not required when the sleeve and the outer periphery of the sleeve are pressed and sleeved, and the assembling workability is excellent.
Preferably, the through hole formed in the sleeve and communicating with the screw hole and the screw hole of the sleeve are formed at positions communicating with each other in a radial direction in a state where one end surface of the sleeve and one end surface of the sleeve are located on the same plane.
Accordingly, the sleeve is externally fitted so that the one end surface of the sleeve and the one end surface of the sleeve are located on the same surface, whereby the through hole formed in the sleeve and the screw hole formed in the sleeve can communicate with each other, and the assembling workability is excellent.
Drawings
Fig. 1 is a sectional view showing the configuration of a fluid device using a mechanical seal according to embodiment 1 of the present invention.
Fig. 2 is an exploded sectional view showing the structure of the sleeve and the ferrule.
Fig. 3 is a sectional view showing the mechanical seal in a state of not being assembled in the fluid device.
Fig. 4 (a) is a sectional view showing a state before the biasing force of the adjustment coil spring is adjusted, and (b) is a sectional view showing a state after the biasing force of the adjustment coil spring is completed by the fastener.
Fig. 5 is a perspective view showing a modified example of the through hole of the sleeve.
Fig. 6 is a sectional view showing a modification of the structure of the sleeve and the sleeve.
Fig. 7 is a sectional view seen from the axial direction showing a modification of the structure of the sleeve and the sleeve.
Description of reference numerals:
1: a mechanical seal; 2: a housing; 3: a rotating shaft; 3 a: an outer peripheral surface; 4: a stationary-side seal ring; (stationary ring); 5: a rotation-side seal ring (rotation ring); 5 b: a notch groove; 6: a female threaded portion; 7: a seal cover; 7 a: a step portion; 7 b: an end face; 7 c: a back side; 7 d: a male threaded portion; 9: a coil spring; 10: a bellows; 11: a housing; 12: a drive ring; 15: a sleeve; 15 a: an opening part; 15 b: a back side; 15 c: an outer peripheral surface; 15 d: a through hole; 15 e: an end face; 16: a mating ring; 16 a: a 1 st restriction part; 16 b: a 2 nd restriction part; 17: a sleeve; 17 a: an inner peripheral surface; 17 b: fixing the face; 17 c: an expanding portion; 17 d: an end face; 18: fixing screws; 18 a: a front end portion; 19: a protrusion; 20: a body portion; 20 a: a screw hole; 20 b: an end face; 32: a fastening tool; 35: a sleeve; 35 d: a through hole; 45: a sleeve; 45 a: an outer peripheral surface; 47: a sleeve; 47 a: a step portion; 47 b: an inner peripheral surface; 55: a sleeve; 55 a: an outer peripheral surface; 55 d: a through hole; 57: a sleeve; 57 a: an abutting portion; 57 b: a groove; 60 a: a screw hole; a: the atmosphere side; m: the inside of the device; o1: a through hole central axis; o2: a screw hole central shaft; α Φ: fixed face inner diameter (cannula inner diameter); β Φ: the outside diameter of the sleeve.
Detailed Description
The following describes a mode for carrying out the mechanical seal according to the present invention, based on examples.
[ examples ] A method for producing a compound
The mechanical seal according to the embodiment is explained with reference to fig. 1 to 7.
In fig. 1, the left side of the paper surface is an apparatus inside M, and the right side is an atmosphere side a.
The mechanical seal 1 shown in fig. 1 is a mechanical seal in which a seal fitting such as a stationary seal ring (hereinafter, referred to as a stationary ring 4) or a rotating seal ring (hereinafter, referred to as a rotating ring 5) is attached to a shaft seal portion formed between a housing 2 and a rotating shaft 3 to seal between the housing 2 and the rotating shaft 3, and a coil spring 9 (urging means) for applying a seal surface pressure between the stationary ring 4 and the rotating ring 5 is present on the rotating side.
A female screw portion 6 is formed near an opening of a shaft seal portion of the housing 2, and the female screw portion 6 is screwed with a male screw portion 7d formed on an outer peripheral side of a seal cover 7 holding the stationary ring 4, thereby fixing the stationary ring 4 to the housing 2 via the seal cover 7. Specifically, a space between the outer peripheral surface of the seal cover 7 and the inner peripheral surface of the housing 2 is sealed with the housing 2 by an O-ring 30. On the other hand, the rotating ring 5 disposed movably in the axial direction on the outer periphery of the rotating shaft 3 is pressed against the stationary ring 4 by the axial urging force of the coil spring 9.
The sleeve 15 is fitted around the rotary shaft 3, the sleeve 15 is fixed to the rotary shaft 3 by the sleeve 17 and the fixing screw 18, and the rotary ring 5 is mounted on the sleeve 15 by a mounting structure described later in detail. Thereby causing the rotating ring 5 to rotate together with the rotating shaft 3.
Further, the structure on the back surface 5a side of the rotating ring 5 is such that a bellows 10 is interposed as a shaft seal packing (flushing packing) for a dynamic action, and the space between the rotating ring 5 and the sleeve 15 is sealed by the bellows 10.
The bellows 10 is formed of a material having elasticity such as a rubber material, for example, and has a front neck portion 10a formed by extending a front end of a cylindrical portion extending in an axial direction outward in a radial direction, and the front neck portion 10a is compressed in the radial direction between the inner side of a back surface portion 11a of a metal case 11 fitted to the outer periphery of the rotating ring 5 and the rotating ring 5, thereby fixing the metal case 11 and the rotating ring 5. The front neck 10a abuts against the back surface 5a of the rotating ring 5. The base portion 10b of the bellows 10 is fastened on the outer diameter side by a metal drive ring 12 fitted around the outer peripheral surface thereof, and is pressure-bonded to the outer peripheral surface of the sleeve 15 with an appropriate fastening amount.
A plurality of projecting pieces 11c are projected from the inner diameter side of the back surface portion 11a of the housing 11 and arranged at equal intervals in the circumferential direction extending in the axial direction toward the drive ring 12, and the projecting pieces 11c are loosely fitted into a plurality of grooves 12a formed in the outer circumferential surface of the drive ring 12 and arranged at equal intervals in the circumferential direction extending in the axial direction and recessed in the inner radial direction. The drive ring 12 is engaged with the bellows 10 by an engagement means (not shown) and is stopped (tent) with respect to the sleeve 15. Thereby, the housing 11 is relatively movable in the axial direction with respect to the drive ring 12 and is stopped in the circumferential direction.
A plurality of notch grooves 5b penetrating in the axial direction are provided in the outer peripheral portion of the rotating ring 5. On the other hand, a stopper protrusion 11e is provided at a position corresponding to the notch groove 5b at an end of the housing 11 on the rotating ring 5 side shown in fig. 1, and the stopper protrusion 11e is formed so as to be able to pass through the notch groove 5b and bulge out in the inner radial direction. When the rotational force of the rotary shaft 3 is transmitted to the rotary ring 5 via the sleeve 15, the drive ring 12, the bellows 10, and the housing 11, the stopper protrusion 11e prevents the housing 11 and the rotary ring 5 from idling relative to each other, and the rotational force of the housing 11 is reliably transmitted to the rotary ring 5. The stopper protrusion 11e may be formed by press working the body of the housing 11.
The sleeve 15 is formed in a thin-sheet hollow cylindrical shape having an inner diameter slightly larger than the outer diameter of the rotation shaft 3. Specifically, the sleeve 15 is formed to have a thickness of 3 pitches or less of the pitch of the fixing screw 18. The sleeve 15 has a length in the axial direction of the rotary shaft 3, an annular opening 15a formed by expanding a diameter stepwise on the outer diameter side is formed at an end portion on the device inner side M in the longitudinal direction, and an O-ring 31 is disposed in the opening 15 a. The O-ring 31 is compressed by the outer peripheral surface 3a of the rotary shaft 3 and the opening 15a, and prevents the sealed fluid from leaking into the gap between the sleeve 15 and the rotary shaft 3 inside the device M.
An annular engaging ring 16 of the sleeve 15 is fixed to the opening 15a by welding or the like. The adapter ring 16 is provided with a 1 st limiting portion 16a extending radially inward and a 2 nd limiting portion 16b extending radially outward on the side axially opposite to the 1 st limiting portion 16 a. The 1 st restricting portion 16a restricts the movement of the O-ring 31 in the axial direction, and the 2 nd restricting portion 16b abuts the back surface of the bellows 10 and supports the coil spring 9 in the axial direction via the bellows 10 and the housing 11 together with the back surface 15b of the opening 15 a.
A sleeve 17 is fitted around the end of the sleeve 15 on the air side a in the longitudinal direction. The sleeve 17 is formed in an annular shape, and an inner peripheral surface 17a thereof includes a fixed surface portion (an outer insertion portion) 17b parallel to an outer peripheral surface 15c of the sleeve 15 and a tapered diameter-enlarged portion 17c having an inclined diameter larger than the fixed surface portion 17b with an opening of the device inner side M directed in the axial direction.
The sleeve 17 further includes a cylindrical projecting portion 19 projecting toward the opening side of the device inside M in the axial direction. The protrusion 19 has a smaller outer diameter than a main body 20 having a screw hole 20a described later in detail, and is insertable into a step portion 7a formed at an end portion side of the atmosphere side a of the seal cover 7.
A screw hole 20a penetrating in the radial direction is formed in the sleeve 17, and a through hole 15d through which a tip portion 18a of a fixing screw 18 tightened by the screw hole 20a is inserted is formed in the main body portion 20 of the sleeve 15.
As shown in fig. 2, the inner diameter α Φ of the fixing surface portion 17b of the sleeve 17 is formed smaller than the outer diameter β Φ of the sleeve 15 (α Φ < β Φ) except for the enlarged diameter portion 17 c. The maximum diameter γ Φ of the enlarged diameter portion 17c is formed to be slightly larger than the outer diameter β Φ of the sleeve 15 (β Φ < γ Φ).
Further, a distance L1 from the end surface 15e on the atmosphere side a of the sleeve 15 to the central axis O1 of the through hole 15d and a distance L2 from the end surface 17d on the atmosphere side a of the sleeve 17 to the central axis O2 of the screw hole 20a are the same (L1 is L2). Further, the through hole 15d and the screw hole 20a are formed in the same diameter, and the sleeve 17 is fitted so that the end face 15e of the sleeve 15 on the atmosphere side a and the end face 17d of the sleeve 17 on the atmosphere side a are flush with each other, whereby the through hole 15d formed in the sleeve 15 and the screw hole 20a formed in the sleeve 17 axially overlap each other, and the operation of bringing the through hole 15d and the screw hole 20a into a communicating state is facilitated.
The mechanical seal 1 is transported in a state where the seal cover 7 and the sleeve 15 are unitized so as not to be detached from each other, and is mounted on a fluid equipment. Specifically, as shown in fig. 3, the seal cover 7 to which the component on the stationary ring 4 side is assembled is loosely fitted to the outer diameter side of the sleeve 15 to which the component on the rotating ring 5 side is assembled, and in this state, the outer peripheral surface 15c of the sleeve 15 is press fitted to the sleeve 17. Thereby, the sleeve 15 and the sleeve 17 are coupled so as not to be movable relative to each other, and the seal cover 7, which is a component to be assembled with the stationary ring 4 side, is sandwiched between the sleeve 17 and the rotating ring 5, whereby the mechanical seal 1 is unitized. At this time, the screw hole 20a of the sleeve 17 is tightened in advance to such an extent that the tip portion 18a of the fixing screw 18 does not abut against the outer peripheral surface 3a of the rotary shaft 3, and the fixing screw 18 can be prevented from being lost when the unitized mechanical seal 1 is transported, but the fixing screw 18 may not be tightened in advance.
When the mechanical seal 1 is incorporated into a fluid device, first, as shown in fig. 4 (a), the rotating shaft 3 of the fluid device is inserted into the sleeve 15 of the unitized mechanical seal 1. Specifically, the mechanical seal 1 is inserted from the opening side of the housing 2, and the female screw portion 6 of the housing 2 is screwed to the male screw portion 7d of the seal cover 7 to fix the seal cover 7 to the housing 2.
Next, as shown in fig. 4 (b), a fastener 32 having a predetermined thickness is inserted between the end face 7b of the seal cover 7 on the atmosphere side a and the end face 20b of the main body 20 of the ferrule 17, and the ferrule 17 is moved to the atmosphere side a. As a result, the sleeve 15 connected to the sleeve 17 so as to be immovable moves relative to the rotary shaft 3, the coil spring 9 acting between the sliding surfaces of the stationary ring 4 and the rotary ring 5 is compressed, and the coil spring 9 is set in a state in which a predetermined biasing effect is exerted. Further, the biasing force of the coil spring 9 can be adjusted according to the thickness of the inserted fastener 32.
Finally, after the biasing force of the coil spring 9 is set by inserting the fastening tool 32, the distal end portion 18a of the fixing screw 18 is pressed against the outer surface of the rotary shaft 3 to fix the sleeve 15 in a state of being stopped on the rotary shaft 3, and the fastening tool 32 is removed to complete the assembly of the mechanical seal 1 (to the state shown in fig. 1).
As described above, since the inner diameter α Φ of the sleeve 17 is formed smaller than the outer diameter β Φ of the sleeve 15, the sleeve 17 is press-fitted to the outer periphery of the sleeve 15, and the relative movement between the sleeve 15 and the sleeve 17 is restricted, when the fastener 32 moves the sleeve 17, the movement amounts of the sleeve 17 and the sleeve 15 are matched, and the biasing force of the coil spring 9 can be adjusted with high accuracy.
As in the conventional art, in the case of the form in which the tip of the fixing screw is joined to the through hole of the sleeve, there is a possibility that the through hole joined to the tip of the fixing screw and the central axis of the fixing screw are axially displaced when the sleeve thickness is small, but in the form of the present embodiment, since the joining structure by the tip of the fixing screw 18 is not used when moving the sleeve 15, it is possible to restrict the relative movement of the sleeve 15 and the collar 17 even when the sleeve thickness is small.
In the embodiment of the present embodiment, since the sleeve 15 and the sleeve 17 are not welded, the welded portion between the sleeve 15 and the sleeve 17 is not deteriorated, and the individual performance difference of the mechanical seal 1 is not generated. In addition, the labor of the welding step and the cost of the welding step can be reduced. Further, since the sleeve 17 is press-fitted to the sleeve 15, even if the through hole 15d of the sleeve 15 and the screw hole 20a of the sleeve 17 are assembled in a state in which the shaft is offset, they can be disengaged from each other, so that the assembly can be performed many times in a state in which the shafts are aligned, and the yield is high.
Further, since the sleeve 17 has the enlarged diameter portion 17c formed such that one opening in the axial direction is enlarged in diameter in the outward direction and the maximum diameter γ Φ is slightly larger than the outer diameter β Φ of the sleeve 15, the sleeve 15 is guided by the inner surface of the enlarged diameter portion 17c of the sleeve 17 to the fixed surface portion 17b having a small outer diameter, and the assembling workability at the time of caulking is excellent.
As shown in fig. 4 (a) and (b), an axial dimension L3 of the protrusion 19 protruding from the main body 20 of the sleeve 17 in the direction facing the seal cover 7 is formed to be larger than an axial depth dimension L4 of the step portion 7a formed on the end portion side of the atmosphere side a of the seal cover 7. Therefore, in a state where the tip of the protrusion 19 is in contact with the back surface 7c of the step portion 7a of the seal cover 7, a gap is formed between the end surface 20b of the body portion 20 of the ferrule 17 and the end surface 7b of the seal cover 7, so that the fastener 32 is easily inserted, and the workability of assembly is excellent.
In this embodiment, the effect of restricting the relative movement of the sleeve 17 and the sleeve 15 by pressing the sleeve against the sleeve is described by taking the case of assembling the mechanical seal 1 to the fluid device as an example, but the present invention is not limited to this, and such an effect can be exhibited: when the unitized mechanical seal 1 is transported, the relative movement between the sleeve 17 and the sleeve 15 is restricted, and the occurrence of the axial misalignment between the threaded hole 20a of the sleeve 17 and the through hole 15d of the sleeve 15 can be prevented, thereby improving the efficiency of the post-transport assembly operation.
Further, when the rotary shaft 3 is driven to rotate, the sleeve 17 is restricted from moving relatively in the rotational direction of the sleeve 15 by the fitting force of the tightening, so that the tip portion 18a of the fixing screw 18 does not abut against the through hole 15d of the pressing sleeve 15 from the circumferential direction, and deformation of the tip portion 18a of the fixing screw 18 or the periphery of the through hole 15d is suppressed, and the life of the screw is prolonged.
Further, since the inner peripheral surface of the sleeve 17 is circular, the contact area with the sleeve 15 can be greatly secured.
While the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications and additions that do not depart from the spirit and scope of the invention are also included in the invention.
For example, in the above embodiment, the mechanical seal is described by taking an insertion-type and rotation-type mechanical seal as an example, but the present invention can also be applied to an outer-type mechanical seal which is a type of sealing a liquid which is to leak from the inner periphery to the outer periphery of the sliding surface. Further, the present invention can also be applied to a fixed mechanical seal in which a spring is disposed on the fixed side.
As shown in fig. 5, the through hole 35d formed in the sleeve 35 may be an elongated hole that is longer in the circumferential direction than the screw hole 20a formed in the sleeve 17. Accordingly, the through hole 35d formed in the sleeve 35 and the screw hole 20a formed in the sleeve 17 are easily communicated in the radial direction, and high work accuracy is not required when the sleeve 17 is press-fitted to the outer periphery of the sleeve 15, and the assembling workability is excellent. Although not shown, the through hole formed in the sleeve may be formed to be longer than the screw hole 20a formed in the sleeve 17 in the axial direction, so that they can easily communicate with each other.
In the above embodiment, the through hole 15d formed in the sleeve 15 and the threaded hole 20a formed in the sleeve 17 have the same diameter, and thus the communication therebetween is easily confirmed and the strength of the sleeve 15 is ensured when viewed from the outer diameter side of the threaded hole 20a, but the through hole formed in the sleeve may be made larger in diameter than the threaded hole 20a to facilitate the communication therebetween. Conversely, a smaller diameter may be used in a range in which the distal end portion 18a of the fixing screw 18 can be inserted.
As shown in fig. 6, an inner peripheral surface 47b of a stepped portion 47a formed on the inner peripheral side of the sleeve 47 may be press-fitted to an outer peripheral surface 45a of the sleeve 45, and the sleeve 45 may be configured to have no through hole penetrating in the radial direction.
Instead of the enlarged diameter portion 17c formed in the sleeve 17, a small diameter portion having a small tip may be provided in the sleeve 15. Further, the diameter-enlarged portion 17c of the sleeve 17 may be omitted by utilizing the deformation of the sleeve 15 and the sleeve 17.
In the above-described embodiment, the inner peripheral surface of the sleeve 17 is circular, but the present invention is not limited to this, and for example, as shown in fig. 7, a plurality of concave grooves 57b may be formed along the axial direction on the inner peripheral surface of the sleeve 57, and in this case, the inner diameter of the abutting portion 57a that abuts against the outer peripheral surface 15c of the sleeve 15 on the fixed surface portion of the sleeve 57 may be formed smaller than the outer diameter of the sleeve 15. In other words, the minimum inner diameter of the sleeve fixing surface portion (male plug portion) may be formed smaller than the outer diameter of the sleeve, and the shape of the inner peripheral side of the sleeve is not limited.
Further, the through hole formed in the sleeve and the screw hole formed in the sleeve are restricted from moving relative to each other in the circumferential direction so as to be easily communicated with each other.
In addition, the stepped portion 7a of the seal cover 7 may be eliminated, and in this case, the protruding portion 19 of the ferrule 17 abuts against the end face 7b of the seal cover 7, and a gap is formed between the end face 20b of the body portion 20 of the ferrule 17 and the end face 7b of the seal cover 7, so that the fastener 32 can be easily inserted. The protruding portion 19 is not limited to a ring shape, and may be arranged in a plurality along the circumferential direction.
Claims (7)
1. A mechanical seal, having:
a seal housing mounted on a housing of the fluid device;
the sleeve is sleeved on the rotating shaft of the fluid device;
a rotating ring attached to the rotating shaft via the sleeve and rotating together with the rotating shaft;
a stationary ring held inside the seal cover and forming a sliding contact portion together with the rotating ring;
a biasing unit that biases the rotating ring and the stationary ring in opposite directions; and
an annular sleeve externally inserted in the sleeve,
the mechanical seal member fixes the sleeve and the rotary shaft by a fixing screw tightened with a screw hole formed in the sleeve,
the inner diameter of the outer insertion part of the sleeve is formed smaller than the outer diameter of the sleeve,
the sleeve includes a protruding portion protruding from the body portion in a direction opposite to the seal cover,
a gap is formed between the body portion of the sleeve and an opposing face of the seal housing,
a fastener is inserted into the gap when the mechanical seal is installed in the fluidic device.
2. Mechanical seal according to claim 1,
the socket of at least one opening of the sleeve in the axial direction is provided with a cone expanding towards the outward direction.
3. Mechanical seal according to claim 1,
the inner peripheral surface of the sleeve is circular.
4. Mechanical seal according to any of claims 1 to 3,
an inner peripheral surface of a stepped portion formed on an inner peripheral side of the sleeve is press-fitted to an outer peripheral surface of the sleeve, and the sleeve has no through hole penetrating in a radial direction.
5. Mechanical seal according to any of claims 1 to 3,
the through hole formed in the sleeve and communicating with the screw hole is formed larger at least in the circumferential direction than the screw hole formed in the sleeve.
6. Mechanical seal according to any of claims 1 to 3,
in a state where one end surface of the sleeve and one end surface of the sleeve are located on the same surface, a through hole formed in the sleeve and communicating with the screw hole and the screw hole of the sleeve are formed at positions communicating in a radial direction, respectively.
7. Mechanical seal according to any of claims 1 to 3,
a plurality of grooves are provided on an inner peripheral surface of the sleeve, each groove being formed in an axial direction.
Applications Claiming Priority (2)
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| JP2018-184960 | 2018-09-28 | ||
| JP2018184960A JP7111574B2 (en) | 2018-09-28 | 2018-09-28 | mechanical seal |
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| CN110966409A CN110966409A (en) | 2020-04-07 |
| CN110966409B true CN110966409B (en) | 2022-05-13 |
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| CN (1) | CN110966409B (en) |
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| EP3279527A1 (en) * | 2016-08-03 | 2018-02-07 | Microtem di Mattia Chiodetti e Savino Larocca SNC | Mechanical seal system for a drive shaft extending through an opening in a bulkhead |
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| JPH0842707A (en) * | 1994-08-03 | 1996-02-16 | Tanken Seal C-Kou:Kk | Cartridge type mechanical seal |
| JP2017078460A (en) | 2015-10-20 | 2017-04-27 | イーグルブルグマンジャパン株式会社 | mechanical seal |
| WO2018012330A1 (en) | 2016-07-13 | 2018-01-18 | イーグル工業株式会社 | Mechanical seal |
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| CN103100343A (en) * | 2011-11-09 | 2013-05-15 | 祥景精机股份有限公司 | Special shaft seal for agitator |
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| CN207647832U (en) * | 2017-08-03 | 2018-07-24 | 宁波奉化釜运密封件有限公司 | A kind of special integrated mechanical sealing locking device of stainless steel punch multiple-stage centrifugal pump |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020056412A (en) | 2020-04-09 |
| JP7111574B2 (en) | 2022-08-02 |
| CN110966409A (en) | 2020-04-07 |
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