WO2018123617A1 - メカニカルシール - Google Patents
メカニカルシール Download PDFInfo
- Publication number
- WO2018123617A1 WO2018123617A1 PCT/JP2017/044875 JP2017044875W WO2018123617A1 WO 2018123617 A1 WO2018123617 A1 WO 2018123617A1 JP 2017044875 W JP2017044875 W JP 2017044875W WO 2018123617 A1 WO2018123617 A1 WO 2018123617A1
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- WIPO (PCT)
- Prior art keywords
- seal
- cylindrical member
- space
- mechanical seal
- housing
- Prior art date
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Classifications
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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
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting 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
- F16J15/162—Special parts or details relating to lubrication or cooling of the sealing itself
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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
Definitions
- the present invention relates to a mechanical seal provided with a cooling jacket.
- a conventional mechanical seal has a shaft seal formed between a housing and a rotary shaft by sliding a rotary seal ring that rotates with a rotary shaft that passes through the housing and the seal cover, and a stationary seal ring fixed to the housing. The part is sealed.
- liquid is introduced into a space formed between the housing and the shaft seal portion to facilitate sliding between the rotary seal ring and the stationary seal ring. Since the temperature of the liquid in the space rises due to sliding heat generation between the rotating seal ring and the stationary seal ring, the liquid in the space is introduced and circulated to cool the liquid in the space (hereinafter referred to as “circulation type”).
- a system hereinafter referred to as “enclosed type” in which a cooling fluid is circulated in a cooling space of a cooling jacket disposed in the space shown in Patent Document 1 to cool the liquid in the space is employed.
- the mechanical seal shown in Patent Document 1 forms a cooling jacket by welding an annular separate member to an annular cylindrical portion extending in the axial direction of the seal cover after the seal cover is formed in an L-shaped side section. .
- a fluid to be sealed (liquid) in a space formed between the housing and the shaft seal portion is cooled by flowing and circulating a cooling fluid into the cooling chamber of the cooling jacket.
- Patent Document 1 it is necessary to form an annular cylindrical portion in the seal cover when forming the cooling jacket, and the structure is complicated.
- an annular separate member is welded with an O-ring interposed in the annular cylindrical portion, there is a problem that the manufacturing is complicated and the manufacturing cost increases.
- the present invention has been made paying attention to such a problem, and an object of the present invention is to provide a mechanical seal including a cooling jacket with a low manufacturing cost and a simple structure.
- the mechanical seal of the present invention is A housing, a seal cover fixed to the housing, and the rotary shaft are sealed by a stationary seal ring and a rotary seal ring, and a first is provided between the housing and the seal cover, the stationary seal ring, and the rotary seal ring.
- a mechanical seal in which a space is formed A cylindrical member having a larger inner diameter than the stationary seal ring and the rotary seal ring, a secondary seal interposed between one end of the cylindrical member and the housing or the seal cover, and a communication path communicating with the outside
- the first space is partitioned into a second space located on the outer diameter side of the cylindrical member, and a third space located on the inner diameter side of the cylindrical member, and the communication path includes the first space It is characterized by being connected to two spaces.
- the second space formed by partitioning the first space by the cylindrical member with the secondary sealant interposed therebetween can be used as the cooling chamber, the manufacturing cost is low and the structure is low.
- a simple cooling jacket can be provided. Further, since the cooling jacket is formed on the outer diameter side of the stationary seal ring and the rotary seal ring, cooling efficiency and space saving can be achieved.
- the cylindrical member is characterized in that it is clamped in the axial direction by the housing and the seal cover when the seal cover is fixed to the housing. According to this feature, the cylindrical member is sandwiched between the housing and the seal cover by fixing the seal cover to the housing, so that the assembly is easy.
- the secondary seal is characterized by being disposed at both ends of the tubular member. According to this feature, the cylindrical member can be detached by attaching and detaching the housing and the seal cover, so that the cylindrical member can be easily detached.
- the housing is characterized in that an annular recess that is recessed in the axial direction is formed at a position corresponding to an end of the cylindrical member. According to this feature, since the cylindrical member is inserted into the annular recess, the vibration and radial movement of the cylindrical member are restricted.
- An annular groove recessed in the axial direction is formed at the end of the cylindrical member. According to this feature, the secondary seal can be attached to the cylindrical member, so that the assembly is simple. Further, since the groove for mounting the secondary seal on the housing is not formed, the structure of the housing can be simplified.
- the cylindrical member is characterized in that an axially central portion is formed thinner than both end portions. According to this feature, the volume that the cylindrical member occupies the first space can be reduced, and the thermal conductivity of the cooling jacket is excellent.
- the cylindrical member is characterized in that a concave portion that is recessed in the radial direction is formed. According to this feature, when attaching or detaching the tubular member, a finger or instrument can be hooked on the recess, so that attachment and removal work is facilitated.
- the cylindrical member is formed of a metal material. According to this feature, the thermal conductivity and strength are excellent.
- FIG. 1 is a side sectional view of a mechanical seal in Example 1.
- FIG. (A) is a fragmentary side view of the rotary seal ring, and (b) is a front view of the rotary seal ring. It is a front view of a cylindrical member. It is a sectional side view of a cylindrical member.
- (A) is the elements on larger scale of the liquid chamber and cooling chamber of the mechanical seal in the upper part of FIG. 1
- (b) is the elements on larger scale of the liquid chamber and cooling chamber of the mechanical seal in the lower part of FIG.
- It is a sectional side view of the mechanical seal used as a sealing type.
- 6 is a side sectional view of a mechanical seal in Example 2.
- FIG. 6 is a side sectional view of a mechanical seal in Example 3.
- FIG. 6 is a side cross-sectional view of a mechanical seal in Example 4.
- the left side of FIG. 1 is the outside B side (atmosphere side) of the mechanical seal
- the right side of FIG. 1 is the in-machine A side (sealed fluid side) of the mechanical seal.
- the mechanical seal 1 As shown in FIG. 1, the mechanical seal 1 according to the first embodiment is used for sealing a sealed fluid in a shaft seal field of a rotating device in an automobile, a general industrial machine, or the like.
- the mechanical seal 1 is attached to seal a shaft seal portion between a stuffing box 2 (housing) and a rotary shaft 3 inserted through a shaft hole 20 provided in the stuffing box 2.
- the rotating shaft 3 is generally made of metal such as stainless steel, and when the rotating device is a pump, an impeller (not shown) is attached to the in-machine A side.
- the mechanical seal 1 includes a cooling jacket, a case 4 (seal cover), a sleeve 5, stationary sealing rings 6a and 6b, a collar 7, springs 8a and 8b, a rotating sealing ring 9, and a pipe 10 ( A cylindrical member), and an intermediate chamber M (first space) formed by the stuffing box 2, the stationary sealing rings 6a and 6b, the rotary sealing ring 9 and the case 4, which will be described in detail later.
- the cooling chamber C second space
- the liquid chamber R third space
- the stuffing box 2 has a main body portion 21 formed with an outer peripheral surface 21a formed substantially parallel to the shaft, and is formed on the machine A side from the main body portion 21 so as to expand in the outer diameter direction and is formed substantially parallel to the shaft. It has an outer peripheral surface 22a and a substantially flange-shaped projecting portion 22 formed with a side end surface 23 extending in the radial direction and facing the in-machine A side.
- the stuffing box 2 is formed with an opening 25 that is recessed from the in-machine A side to the out-of-machine B side. The inner diameter of the opening 25 is larger than the inner diameter of the inner peripheral surface 20 c of the shaft hole 20.
- the stuffing box 2 is extended substantially in the axial direction from the inner diameter side end of the receiving step 24 toward the outside B side.
- the shaft hole 20 is a space defined by the inner peripheral surface 20c.
- the opening 25 is a space defined by the inner circumferential surface 25a, the curved surface 25b, the inner circumferential surface 26a, and the back end surface 26b.
- annular back end portion 26 annular recess that is recessed toward the outside B in the axial direction is defined by the inner peripheral surface 26a and the back end surface 26b.
- the stuffing box 2 includes a communication path 27 a that is substantially L-shaped in a side sectional view and extends in the radial direction from the outer peripheral surface 21 a of the main body portion 21 to the inner end surface 26 b, and the outer periphery of the main body portion 21.
- a substantially linear communication path 27b extending in the radial direction from the surface 21a and penetrating the shaft hole 20, and a substantially linear communication path extending in the radial direction from the outer peripheral surface 22a of the projecting portion 22 and passing through the opening 25 in the radial direction.
- Passages 28a and 28b are formed.
- each of the communication paths 27 a and 27 b is alternately arranged in the circumferential direction of the outer peripheral surface 21 a of the main body 21.
- These communication paths 27a and 27b are independent communication paths.
- each of the communication passages 28 a and 28 b is alternately arranged in the circumferential direction of the outer peripheral surface 22 a of the protruding portion 22.
- These communication paths 28a and 28b are independent communication paths.
- the stuffing box 2 includes an annular groove 20a that is formed on the inner peripheral surface 20c and is recessed toward the outer diameter side, and is formed in the receiving step portion 24 and is axially outboard B.
- An annular groove 24a that is recessed to the side is formed.
- An O-ring 20b is inserted into the annular groove 20a, and an O-ring 24b is inserted into the annular groove 24a.
- the materials of the O-rings 20b and 24b are fluorine rubber, nitrile rubber, H-NBR, EPDM, perfluoroelastomer and the like.
- the O-ring may be another secondary seal such as a packing material. The same applies to the O-ring described later.
- the stationary sealing ring 6a is fixed to the inner peripheral surface 20c on the outside B side by being sealed by the O-ring 20b.
- the stationary seal ring 6a is provided with a shaft hole 60a through which the sleeve 5 is inserted.
- the stationary seal ring 6a is formed with a flange 61a extending in the radial direction on the machine A side. On the machine A side of the flange 61a, an annular protrusion projecting in the axial direction toward the machine A side.
- a ring 62a is formed.
- the flange 61a of the stationary seal ring 6a is formed with a plurality of guide recesses 63a whose outer sides in the radial direction are notched, and the rotation pin 65a is inserted. ing. Since the rotation pin 65a is fixed to the back end surface 26b of the back end portion 26, the stationary sealing ring 6a is restricted from rotating.
- a plurality of spring accommodating recesses 26c are formed in the back end surface 26b of the back end portion 26 of the stuffing box 2 as shown in FIG.
- a spring 8a is disposed between the flange 61a and the spring accommodating recess 26c in a compressed state.
- the springs 8a are arranged in a form that uses a plurality of small-diameter springs at predetermined intervals in the circumferential direction, that is, a multi-spring type.
- the spring 8a may be a wave coil spring or the like in addition to the coil spring.
- the stationary seal ring 6a is made of SiC by a special conversion method (partially converting the carbon surface to SiC, reinforcing the surface strength, and combining both the wear resistance of SiC and the self-lubricating property of carbon). It has been produced. Moreover, you may manufacture with other SiC, such as diamond-coated SiC and reaction sintering SiC (what was made into the composition of SiC + Si). The same applies to the stationary sealing ring 6b.
- the case 4 is provided with a shaft hole 40 through which the rotary shaft 3 is inserted.
- the case 4 is formed in a substantially ring shape including a main body portion 42 including an outer peripheral surface 42a formed substantially parallel to the shaft, and the main body portion 42 is a lower end of a side end surface 43 facing the outside B side.
- An annular recess 44 that is recessed toward the in-machine A side is formed between the shaft hole 40 and the shaft hole 40.
- the case 4 includes a communication channel 47a that is substantially L-shaped when viewed from the side cross section and extends in the radial direction from the outer peripheral surface 42a of the main body 42 and penetrates the side end surface 43 in the axial direction. And a substantially linear communication passage 47b penetrating up to 44 is formed.
- Each of the communication passages 47 a and 47 b is alternately arranged in the circumferential direction of the outer peripheral surface 42 a of the main body 42.
- These communication paths 47a and 47b are communication paths independent of each other.
- annular groove 44a that is recessed radially outward is formed on the inner periphery of the main body 42 and on the outer side B.
- An O-ring 44b is inserted into the annular groove 44a.
- the stationary sealing ring 6b is fixed to the inner periphery on the side A in the machine 4 by sealing the stationary sealing ring 6b to the O-ring 44b.
- the stationary sealing ring 6b has substantially the same structure as the stationary sealing ring 6a, and is formed with a shaft hole 60b, a flange 61b, and a protruding ring 62b.
- a plurality of guide recesses 63b are formed, and rotation is restricted by inserting a rotation pin 65b (see FIG. 5B) into the guide recess 63b.
- a plurality of spring accommodating recesses 46b are formed in the side end face 43 of the case 4, and the side face of the flange 61b of the stationary seal ring 6b on the outboard B side and the spring are formed.
- a spring 8b is disposed in a compressed state between the housing recess 46b.
- the sleeve 5 is made of metal such as stainless steel, has an annular shape, and is fixed to the rotary shaft 3 via an O-ring 50b.
- the fixing structure of the rotating shaft 3 and the sleeve 5 is not limited, but is fixed using, for example, a set screw (not shown).
- the sleeve 5 has an outer peripheral surface that is gradually reduced in diameter from the outside B side toward the inside A side, and in order from the outside B side, the first outer peripheral surface 51, the second outer peripheral surface 52, and the third outer peripheral surface.
- a surface 53 and a fourth outer peripheral surface 54 are formed.
- the second outer peripheral surface 52 is formed in a tapered shape, and an annular step portion 55 is formed at a boundary portion between the third outer peripheral surface 53 and the fourth outer peripheral surface 54.
- the sleeve 5 is formed with a guide recess 56a (see the upper side in FIG. 1) in which a female screw is formed on the inner diameter side at a predetermined interval in the circumferential direction in the vicinity of the annular step portion 55.
- a locking pin 56 is screwed into the plurality of guide recesses 56a.
- the rotation pin 56 is inserted into the plurality of guide recesses 91 of the rotary seal ring 9.
- the rotation pin 56 may be attached to the guide recess 56a by an attachment method other than screwing, such as key or pin bonding.
- the sleeve 5 is formed with an internal thread 59a extending in the axial direction at an end 59 located on the in-machine A side, and the rotary seal ring 9 and the collar 7 are inserted into the fourth outer peripheral surface 54.
- the collar 7 is fixed to the sleeve 5 by socket bolts 57.
- the collar 7 has an annular shape, and includes a cylindrical portion 71 and a protruding portion 72 protruding in the inner diameter direction from the inner peripheral surface 71b of the cylindrical portion 71, and is formed in a substantially T shape in a side sectional view.
- the rotary seal ring 9 has an annular shape and is arranged at a predetermined interval in the circumferential direction on the inner periphery, and a plurality of guide recesses 91 that are recessed toward the outer diameter side.
- a stirring groove portion 92 composed of a pair of stirring grooves 92a and 92b facing each other at the outer periphery and recessed toward the inner diameter side is equally spaced at a predetermined interval in the circumferential direction.
- the stirring groove 92a is formed in a shape in which a tip portion facing the inner stirring groove 92b of one short side of a substantially rectangular shape in a side view is a semicircular arc shape. As shown in (b), it is formed in a substantially right triangle shape in which a substantially right angle portion is located on the side facing the stirring groove 92b in a front view. Moreover, since the stirring groove 92b is substantially the same shape as the stirring groove 92a, the description thereof is omitted. That is, the stirring grooves 92a and 92b are grooves that are deeply recessed on the inner diameter side on the opposite side.
- the guide recesses 91 are formed in four equal distributions.
- the guide recesses 91 are not limited to this, and may be two or eight equal distributions. Absent.
- the stirring groove part 92 is formed in two equal distribution, it is not restricted to this, Only one place arrangement
- positioning may be sufficient, it may be 4 equal distribution, 8 equal distribution, and it is limited to 2 equal distribution. It is not a thing.
- the rotary seal ring 9 when the rotary seal ring 9 is inserted into the sleeve 5, it is substantially reversely viewed in a side sectional view formed by the annular step portion 96 (see FIG. 2B) on the inner peripheral side and the fourth outer peripheral surface 54 of the sleeve 5.
- a letter-shaped annular groove 90a is formed (see the lower part of FIG. 1).
- An O-ring 90b is inserted into the annular groove 90a.
- the collar 7 is fixed to the sleeve 5 by the socket bolt 57 at the time of assembly. At this time, the protrusion 72 of the collar 7 abuts against the end 59 of the sleeve 5 so that the insertion position is aligned.
- the end portion 73 on the outboard side B is slightly inserted into the annular groove 90 a in the axial direction.
- the sleeve 5 and the rotary seal ring 9 are sealed with an O-ring 90b.
- the rotary seal ring 9 is made of SiC by a special conversion method (partially converting the carbon surface to SiC to reinforce the surface strength so that both the wear resistance of SiC and the self-lubricating property of carbon are combined). It has been produced. Moreover, you may manufacture with other SiC, such as diamond-coated SiC and reaction sintering SiC (what was made into the composition of SiC + Si).
- the pipe 10 is made of stainless steel, has a shaft hole 100 through which the stationary seal rings 6 a and 6 b and the rotary seal ring 9 are inserted, and has a substantially cylindrical shape. It is made.
- the pipe 10 includes an outer peripheral surface 10a and an inner peripheral surface 10b formed substantially parallel to the shaft, and side end portions 101 and 102 in the axial direction.
- the inner peripheral surface 10b includes a substantially central portion in the axial direction.
- An annular recess 103 that is recessed in the outer diameter direction is formed.
- the pipe 10 is not limited to stainless steel, and may be formed of other metals or reinforced resin. A metal is preferable because it is excellent in thermal conductivity and strength.
- the pipe 10 can be easily removed.
- the recessed part 103 is cross-sectional view substantially U-shaped, the instrument inserted in the corner
- the recessed part 103 may not be cyclic
- the recessed part 103 may be formed in the outer peripheral surface 10a.
- the side end portions 101 and 102 are each expanded in the outer diameter direction. Further, annular grooves 101a and 102a that are recessed in the axial direction are formed in the side end portions 101 and 102, respectively, and O-rings 101b and 102b (secondary seals) are respectively inserted into the annular grooves 101a and 102a. . Further, the substantially central portion of the pipe 10 is thinner than the side end portions 101 and 102.
- the pipe 10 is configured such that the outer diameter of the side end portion 101 located on the outside B side is equal to the inner diameter of the inner peripheral surface 26 a of the rear end portion 26 of the stuffing box 2. They are formed with substantially the same dimensions.
- a plurality of socket bolts 45 are inserted through a plurality of through holes 49 arranged in the circumferential direction of the case 4 and extending in the axial direction, and a plurality of female screw portions 29 formed in the stuffing box 2. Screwed on. Thereby, the case 4 can be detachably fixed to the stuffing box 2.
- O-rings 101 b and 102 b arranged at both ends of the pipe 10 are pressed by the side end surfaces 43 of the case 4 by the above-described screwing of the socket bolt 45, so that the gap between both ends of the pipe 10 and the stuffing box 2 and the case 4 is Sealed liquid-tight. More specifically, the O-ring 101b on the outboard side B of the pipe 10 is tightly pressed between the rear end surface 26b of the stuffing box 2 and the annular groove 101a so as to seal between the pipe 10 and the stuffing box 2. Further, the O-ring 102 b is pressed by the side end face 43 of the case 4, and is sandwiched between and closely adhered to the annular groove 102 a and the side end face 43, thereby sealing between the stuffing box 2 and the case 4.
- the intermediate chamber M has an inner peripheral surface 25 a, a curved surface 25 b, an inner peripheral surface 26 a, a back end surface 26 b, and the case 4 side.
- This is an annular space defined by the end face 43, the stationary sealing rings 6 a and 6 b and the rotary sealing ring 9.
- the cooling chamber C When the intermediate chamber M is partitioned by the pipe 10 being sandwiched between the stuffing box 2 and the case 4, the cooling chamber C includes the inner peripheral surface 25 a and the curved surface 25 b of the stuffing box 2 and the outer periphery of the pipe 10. This is an annular space defined by the surface 10 a and the side end surface 43 of the case 4. In this way, a cooling jacket having a cooling chamber C is formed by the stuffing box 2, the pipe 10, and the case 4. Note that communication paths 28 a and 28 b communicate with the cooling chamber C.
- the liquid chamber R is an annular space defined by the inner peripheral surface 10 b of the pipe 10, the rear end surface 26 b of the stuffing box 2, the side end surface 43, the stationary sealing rings 6 a and 6 b and the rotary sealing ring 9. It is.
- the mechanical seal 1 is an enclosed mechanical seal in which a sealant F ⁇ b> 1 (liquid) is sealed in a liquid chamber R, and includes a stationary seal ring 6 b and a rotary seal ring 9 positioned on the in-machine A side. Prevents the sealed fluid L from flowing into the liquid chamber R, and the stationary sealing ring 6a and the rotary sealing ring 9 located on the outside B side prevent the sealant F1 from flowing out to the outside B side.
- the communication passages 27a and 47a are closed by plugs 27c and 47c.
- Cooling water F2 (cooling fluid) is circulated from the communication path 28a to the communication path 28b via the cooling chamber C, and the pipe 10 is cooled by the cooling water F2 so that it is sealed on the inner diameter side of the pipe 10.
- the sealed sealant F1 can be cooled.
- the cooling fluid may be steam.
- the stirring groove portion 92 is composed of a pair of opposing stirring grooves 92 a and 92 b, the stirring groove portion 92 can be stirred regardless of the rotation direction of the rotating shaft 3.
- the shape of the stirring grooves 92a and 92b is not limited to the shape described above, and may be, for example, a known spiral shape. In short, any shape that can stir the sealant F1 in the liquid chamber R may be used.
- the sealant F1 is circulated from the communication passage 47a via the liquid chamber R toward the communication passage 27a in a state where the communication passages 28a and 28b are closed by the plug bodies 28c and 28d, respectively. It can be used as a circulation type mechanical seal.
- the cooling water F2 may be circulated through the communication passages 28a and 28b to increase the cooling efficiency.
- the communication passages 27a, 28a, 28b, 47a can be closed with a plug, and the sealant F1 can be sealed in the liquid chamber R for use.
- the mechanical seal 1 according to the first embodiment is manufactured because the cooling chamber C can be defined by dividing the intermediate chamber M by the pipe 10 with the O-rings 101b and 102b interposed therebetween.
- a cooling jacket having a low cost and a simple structure can be provided. Further, since the cooling jacket is formed on the outer diameter side of the stationary sealing rings 6a and 6b and the rotary sealing ring 9, cooling efficiency and space saving can be achieved.
- the pipe 10 is easily assembled because the case 4 is fixed to the stuffing box 2 and is sandwiched between the stuffing box 2 and the case 4.
- the pipe 10 since the pipe 10 includes the O-rings 101b and 102b interposed between the stuffing box 2 and the case 4, the pipe 10 can be attached and detached by detaching the stuffing box 2 and the case 4, The pipe 10 can be easily detached.
- the mechanical seal 1 is excellent in versatility because the cooling jacket can be configured by attaching the pipe 10 to the stuffing box 2 and the case 4 that have been used conventionally.
- the O-rings 101b and 112b may be attached to the pipe 10 that is smaller than the stuffing box 2, the assembly is easy. Further, since the annular groove for mounting the O-ring for sealing the pipe 10 is not formed in the stuffing box 2, the structure of the housing can be simplified. Furthermore, when using a mechanical seal without assembling the pipe 10, it is possible to prevent dust and the like from being deposited on the stuffing box 2 and the case 4. The same applies to case 4.
- the pipe 10 is formed so that the central portion in the axial direction is thinner than the side end portions 101 and 102, the volume occupying the intermediate chamber M can be reduced and the thermal conductivity of the cooling jacket is excellent.
- the pipe 10 is formed in one substantially plate shape in a side sectional view, the cooling jacket is compared with the cooling jacket formed by welding two annular members as in the prior art document 1.
- the volume occupied in the intermediate chamber M is small.
- the pipe 210 of the mechanical seal 200 in the second embodiment is formed in a flange shape in which the side end portion 212 located on the case 4 side is expanded in the outer diameter direction.
- a through hole 212a is formed in the axial direction.
- the pipe 210 can be fixed to the end face 43 of the case 4 by screwing the bolt 212b into the female screw portion 243a of the case 4 through the through-hole 212a of the pipe 210, so that the pipe 210 and the case 4 can be integrated. .
- the intermediate chamber M can be defined as the cooling chamber C and the liquid chamber R by fixing the pipe 210 and the case 4 integrated to the stuffing box 2.
- the pipe 210 may be fixed to the case 4 by welding instead of the bolt 212b.
- the pipe 210 may be integrally fixed to the stuffing box 2, and in this case, the pipe 210 and the case 4 are sealed by the O-ring 102b as in the first embodiment.
- the pipe 310 of the mechanical seal 300 in the third embodiment is formed in a flange shape in which the side end portion 311 located on the stuffing box 2 side is expanded in the outer diameter direction.
- An annular groove 311a that is recessed in the inner diameter direction is formed in the outer peripheral portion 311c on the outer diameter side, and an O-ring 311b is inserted.
- the rear end 326 of the stuffing box 2 is formed so that the end 311 can be inserted.
- the mechanical seal 400 according to the fourth embodiment is in a single type using one stationary sealing ring 406 and one rotating sealing ring 409.
- a sealed fluid L1 liquid is sealed from between the stuffing box 2 and the rotary shaft 3 to the liquid chamber R1. It is an inside type that prevents leakage.
- the communication passages 27a and 47a are closed by plugs (not shown).
- cooling water F2 is circulated in the cooling chamber C.
- the O-rings 101b and 102b are mounted in the annular grooves 101a and 102a formed in the side end portions 101 and 102 of the pipe 10, but the present invention is not limited thereto, and the stuffing box 2 and A mode in which a secondary seal such as an O-ring is attached to the case 4 may be used. In this mode, the shape of the pipe 10 can be simplified.
- a double-type mechanical seal has been described.
- a single-type mechanical seal has been described.
- the type of the mechanical seal is not limited to these, for example, a tandem mechanical seal. Also good.
- the example in which the second space is the cooling chamber C and the third space is the liquid chambers R and R1 has been described, but the fluid introduced or sealed in the second space and the third space is It doesn't matter. In short, what is necessary is just to partition the first space on the outer diameter side of the rotary sealing ring and the stationary sealing ring into the second space and the third space by the pipe.
Abstract
Description
ハウジング及び該ハウジングに固定されたシールカバーと回転軸との間を静止密封環と回転密封環によりシールするとともに前記ハウジング及び前記シールカバーと前記静止密封環及び前記回転密封環との間に第1空間が形成されたメカニカルシールであって、
前記静止密封環及び前記回転密封環よりも内径の大きい筒状部材と、前記筒状部材の一端と前記ハウジング又は前記シールカバーとの間に介在する二次シールと、外部と連通する連通路とを備え、
前記第1空間は、前記筒状部材の外径側に位置する第2空間と、該筒状部材の内径側とに位置する第3空間と、に区画され、かつ
前記連通路は、前記第2空間に連通されていることを特徴としている。
この特徴によれば、二次シール材を介在させた筒状部材により第1空間を区画することで形成された第2空間を冷却室とすることができることから、製造コストが安価であり構造が簡単な冷却ジャケットを備えることができる。また、静止密封環及び回転密封環の外径側に冷却ジャケットが構成されるため、冷却効率及び省スペース化が図られる。
この特徴によれば、ハウジングにシールカバーを固定することで、筒状部材はハウジングとシールカバーとにより挟持されることから、組み立てが簡単である。
この特徴によれば、前記ハウジングと前記シールカバーとを着脱させることで、前記筒状部材を脱着させることができるため、筒状部材の脱着が容易である。
この特徴によれば、環状凹部に筒状部材が挿嵌されるため、筒状部材の振動や径方向への移動が規制される。
この特徴によれば、筒状部材に二次シールを装着すればよいから組み立てが簡単である。また、ハウジングに二次シールを装着するための溝が形成されないことから、ハウジングの構造をシンプルにできる。
この特徴によれば、筒状部材が第1空間を占有する体積を小さくすることができるとともに冷却ジャケットの熱伝導性に優れる。
この特徴によれば、筒状部材を着脱する際に、手指や器具等を凹部に引っかけることができるため、取付けや取外し作業が容易となる。
この特徴によれば、熱伝導性かつ強度に優れる。
2 スタッフィングボックス(ハウジング)
3 回転軸
4 ケース(シールカバー)
6a,6b 静止密封環
9 回転密封環
10 パイプ(筒状部材)
26 奥端部(環状凹部)
28a 連通路
28b 連通路
101a 環状溝
101b Oリング(二次シール)
102a 環状溝
102b Oリング(二次シール)
103 凹部
A 機内
B 機外
M 中間室(第1空間)
C 冷却室(第2空間)
R 液室(第3空間)
F1 シーラント(液体)
F2 冷却水(冷却流体)
L1 被密封流体(液体)
Claims (8)
- ハウジング及び該ハウジングに固定されたシールカバーと回転軸との間を静止密封環と回転密封環によりシールするとともに前記ハウジング及び前記シールカバーと前記静止密封環及び前記回転密封環との間に第1空間が形成されたメカニカルシールであって、
前記静止密封環及び前記回転密封環よりも内径が大きい筒状部材と、前記筒状部材と少なくとも前記ハウジング又は前記シールカバーとの間に介在する二次シールと、外部に連通する連通路とを備え、
前記第1空間は、前記筒状部材の外径側に位置する第2空間と、該筒状部材の内径側に位置する第3空間と、に区画され、かつ
前記連通路は、前記第2空間に連通されていることを特徴とするメカニカルシール。 - 前記筒状部材は、前記ハウジングに前記シールカバーが固定されたときに、前記ハウジングと前記シールカバーにより軸方向に挟持されていることを特徴とする請求項1に記載のメカニカルシール。
- 前記二次シールは前記筒状部材の両端に配置されていることを特徴とする請求項1または2に記載のメカニカルシール。
- 前記ハウジングは、前記筒状部材の端部に対応する位置に軸方向に凹む環状凹部が形成されていることを特徴とする請求項1ないし3のいずれかに記載のメカニカルシール。
- 前記筒状部材の端部には、軸方向に凹む環状溝が形成されていることを特徴とする請求項1ないし4のいずれかに記載のメカニカルシール。
- 前記筒状部材は、軸方向中央部が両端部よりも肉薄に形成されていることを特徴とする請求項1ないし5のいずれかに記載のメカニカルシール。
- 前記筒状部材は、径方向に凹む凹部が形成されていることを特徴とする請求項1ないし6のいずれかに記載のメカニカルシール。
- 前記筒状部材は金属材料により形成されていることを特徴とする請求項1ないし7のいずれかに記載のメカニカルシール。
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US11441684B2 (en) * | 2019-04-10 | 2022-09-13 | A.W. Chesterton Company | Sealing cover element in a mechanical seal |
US20230092010A1 (en) * | 2021-09-20 | 2023-03-23 | Flowserve Management Company | Rotating shaft seal having an easily installed and easily removed internal cooling channel |
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JP2010216491A (ja) * | 2009-03-13 | 2010-09-30 | Eagle Ind Co Ltd | 高温用デッドエンドシール |
WO2011036917A1 (ja) * | 2009-09-24 | 2011-03-31 | イーグル工業株式会社 | メカニカルシール |
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CN2234529Y (zh) * | 1995-05-31 | 1996-09-04 | 中国石化前郭炼油厂 | 一种液体双端面机械密封 |
JP5380713B2 (ja) | 2009-07-16 | 2014-01-08 | イーグル工業株式会社 | メカニカルシール装置 |
WO2011052544A1 (ja) | 2009-10-30 | 2011-05-05 | イーグル工業株式会社 | メカニカルシール |
EP3070378B1 (en) * | 2013-11-12 | 2019-04-10 | Eagle Industry Co., Ltd. | Divided mechanical seal |
CN205534228U (zh) * | 2016-02-03 | 2016-08-31 | 日本皮拉工业株式会社 | 外部型机械密封件 |
CN205559795U (zh) * | 2016-05-06 | 2016-09-07 | 南雄市瑞晟化学工业有限公司 | 一种双端面机械密封结构 |
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JPS421124B1 (ja) * | 1964-06-03 | 1967-01-20 | ||
JP2010216491A (ja) * | 2009-03-13 | 2010-09-30 | Eagle Ind Co Ltd | 高温用デッドエンドシール |
WO2011036917A1 (ja) * | 2009-09-24 | 2011-03-31 | イーグル工業株式会社 | メカニカルシール |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11441684B2 (en) * | 2019-04-10 | 2022-09-13 | A.W. Chesterton Company | Sealing cover element in a mechanical seal |
US20230092010A1 (en) * | 2021-09-20 | 2023-03-23 | Flowserve Management Company | Rotating shaft seal having an easily installed and easily removed internal cooling channel |
US11746908B2 (en) * | 2021-09-20 | 2023-09-05 | Flowserve Pte. Ltd. | Rotating shaft seal having an easily installed and easily removed internal cooling channel |
Also Published As
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JPWO2018123617A1 (ja) | 2019-10-31 |
KR20190089055A (ko) | 2019-07-29 |
CN110088515B (zh) | 2022-01-14 |
CN110088515A (zh) | 2019-08-02 |
JP7055574B2 (ja) | 2022-04-18 |
KR102279664B1 (ko) | 2021-07-20 |
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