WO2016185762A1

WO2016185762A1 - Rotary joint

Info

Publication number: WO2016185762A1
Application number: PCT/JP2016/057095
Authority: WO
Inventors: 知則渡會; 小野　裕一; 澄人佐藤; 一徳長野; 小島　久史
Original assignee: 月島機械株式会社
Priority date: 2015-05-19
Filing date: 2016-03-08
Publication date: 2016-11-24
Also published as: CN107407449B; KR20180009331A; CN107407449A; JP2016217428A; JP5984318B1; KR102422670B1

Abstract

A rotary joint is provided with a rotor (1) that is rotated around an axis (O), a casing (11) arranged on the outer circumference of the rotor (1), and a bearing member (21) that rotatably supports the rotor (1) in the casing (11). Flow paths (5, 6) that open into a first end section (one end section) (1A) in the direction of the axis (O) and through which a heat medium flows are formed within the rotor (1). Communicating chambers (15, 16) that communicate with the flow paths (5, 6) are formed between the casing (11) and the rotor (1). The bearing member (21) is arranged at a position separated from the flow paths (5, 6) and the communicating chambers (15, 16) on at least one of a second end section (other end section) (1B) side in the direction of the axis (O) and a radial outer circumference side with respect to the axis (O). Heat dissipating sections (9, 10, 22, 23) are provided between the flow paths (5, 6) and the bearing member (21) and/or between the communicating chambers (15, 16) and the bearing member (21).

Description

Rotary joint

The present invention relates to a rotary joint used for supplying or discharging a heat medium such as high-temperature steam to a rotating body such as a steam tube dryer or a heating roll.
This application claims priority based on Japanese Patent Application No. 2015-101754 filed in Japan on May 19, 2015, the contents of which are incorporated herein by reference.

As such a rotary joint, for example, Patent Document 1 discloses a casing whose one end is opened, and a tubular rotor which is rotatably supported by a pair of bearings in this casing and has one end coaxially attached to a rotating body. And a spacer mounted so as to provide a gap between the pair of bearings, and an inner tube provided in the casing so as to penetrate the inside of the rotor, and supplying a heat medium to the inside of the rotating body through the inner tube A rotary joint configured to discharge the heat medium used for heating in the rotating body through between the inner tube and the rotor has been proposed.

Patent Document 2 discloses a sealing material for such a rotary joint, such as a condensed polycyclic polynuclear aromatic resin as a matrix resin, a reinforcing fiber made of polyphenylene sulfide fiber or carbon fiber, and a carbon-based material such as lamp black. A sealing material containing a filler and a filler such as a fluororesin or a silicon compound has been proposed. Patent Document 1 also describes that a special carbon seal ring is used as a seal ring for sealing the inside of the casing and the inside of the rotor.

Japanese Unexamined Patent Publication No. 2007-120694 Japanese Unexamined Patent Publication No. 2007-016173

Here, the bearing in the rotary joint described in Patent Document 1 is a rolling bearing (ball bearing) in which a rolling element such as a ball is interposed between the inner and outer rings, but the outer periphery of the rotor through which the heat medium flows. It is attached directly to the part, and there is a possibility that seizure will occur due to the heat medium. For this reason, in the rotary joint described in Patent Document 1, the outer periphery of the spacer is positioned outside the center position of the rolling element, and a flow path for allowing grease to flow toward each bearing is provided. However, in the case of Patent Document 1, the structure of the rotary joint is complicated.

Further, for example, the seal ring described in Patent Document 1 and the seal material described in Patent Document 2 are used to support a rotor using a seal material made of carbon having excellent heat resistance and lubricity as a sliding bearing. It can also be used. However, a rotary joint in a steam tube dryer or a heating roll is usually used with the axis of the rotor directed laterally. Therefore, if such a sliding bearing is used, uneven wear is likely to occur in the lower part of the bearing due to the weight of the rotor, causing sudden damage, abnormal noise due to misalignment, or from the worn part. Heat medium leakage may occur. Furthermore, special carbon sealing materials as described in

Patent Documents

1 and 2 are expensive and inferior in maintenance properties such as replacement.

The present invention is made under such a background, and even in a rotary joint in which a high-temperature heat medium such as the above-described steam tube dryer or heating roll circulates, it is generally used without causing a complicated structure and high cost. It is an object of the present invention to provide a rotary joint that can stably and rotatably support a rotor that rotates integrally with a rotating body by a bearing member such as a rolling bearing.

In order to solve the above problems and achieve such an object, a rotary joint according to the present invention includes a cylindrical rotor rotated around an axis, a casing disposed on the outer periphery of the rotor, and these A bearing member interposed between the rotor and the casing and rotatably supporting the rotor on the casing; the rotor has an opening in the axial direction (first end) of the rotor. A flow path through which the heat medium flows is formed, and a communication chamber communicating with the flow path is formed between the casing and the rotor, and the bearing member extends from the flow path and the communication chamber. The flow path and the bearing are disposed at positions separated from at least one of the second end (other end) side in the axial direction and the outer peripheral side in the radial direction with respect to the axial line. And between the member, the heat radiating portion at least one of the between the communication chamber and the bearing member.

In the thus configured rotary joint, the other end side and the axis line in the axial direction opposite to the one end part where the rotor opens from the flow path of the rotor through which the heat medium flows and the communication chamber between the rotor and the casing. A bearing member is disposed at a position separated from at least one of the outer peripheral side in the radial direction with respect to the outer peripheral side. Further, since at least one of the distance between the flow path and the bearing member as described above and between the communication chamber and the bearing member is provided with a heat radiating portion, the heat is transmitted from the flow path or the communication chamber. Heat can be dissipated by the heat radiating part. For this reason, even when a general rolling bearing is used as the bearing member, seizure can be prevented without complicating the structure, and the rotor can be stably supported so as to be rotatable about the axis.

Further, as the rotor can be stably supported so as to be rotatable about the axis, the clearance between the rotor rotating integrally with the rotating body and the non-rotating fixed casing can be stably maintained. it can. For this reason, as a sealing material for sealing between the outer periphery of the rotor and the casing, without using a special sealing material as described in

Patent Documents

1 and 2, for example, a sealing material such as a gland packing and lubricity can be obtained. Even if a bush (sliding bearing) is used, breakage due to uneven wear, generation of abnormal noise, and leakage of the heat medium can be prevented, and it is possible to smoothly distribute the heat medium and provide an inexpensive rotary joint. It becomes.

Here, as such a heat radiating portion, a heat radiating chamber which is isolated from the flow path and opened to the outside of the rotor can be formed on the other end portion side of the rotor. By forming such a heat radiating chamber between the flow path of the rotor through which the heat medium flows and the bearing member, the heat transmitted from the heat medium is dissipated to the outside from the opening and outer periphery of the heat radiating chamber. It can prevent that a member becomes high temperature.

Further, in the case where the heat dissipating part is provided in the rotor in this way, a flange part that protrudes to the outer peripheral side in the radial direction with respect to the axis may be provided on the other end part side of the rotor. In the above case, heat transmitted from the heat medium can be dissipated by the flange portion, and the flange portion rotates integrally with the rotor and the rotating body, so that a high heat dissipation effect can be obtained.

On the other hand, when providing a heat radiating part in a casing in which a communication chamber is provided between the rotor and the other end part side of the casing, an extending part extending in a cylindrical shape with a space around the outer periphery of the rotor is provided, A fin that protrudes toward the outer peripheral side in the radial direction with respect to the axis can be provided as the heat radiating portion on the extending portion. Of course, heat is dissipated while being transmitted through the extending portion, and the surface area of the extending portion is increased by the fins provided in the extending portion, so that the heat dissipation effect can be improved.

Similarly, when an extension portion extending in a cylindrical shape is provided on the other end portion side of the casing with a space around the outer periphery of the rotor, the extension portion is extended in the radial direction with respect to the axis. You may provide the opening part which penetrates a protrusion part as the said heat radiating part. By providing the opening, heat dissipation from the inner peripheral edge of the opening can be promoted, and the other end of the rotor is exposed through the opening, so that heat transmitted from the flow path of the rotor can also be dissipated. Can do.

It should be noted that the heat radiating chamber and the flange portion of the rotor, or the fin and the opening portion of the extending portion of the casing can be appropriately combined and employed. For example, you may provide a flange part in the outer periphery of the other end part in which the heat radiating chamber of the rotor was formed, or you may provide an opening part between the fins provided in the extension part of the casing. Further, fins or openings may be provided on the flange portion of the rotor, or fins may be provided on the outer periphery of the other end portion of the rotor at intervals from the inner periphery of the extending portion of the casing.

As described above, according to the present invention, even when a general rolling bearing is used as a bearing member, seizure is prevented and the rotor is stabilized without causing a complicated structure or high cost. Thus, it can be supported so as to be rotatable around the axis. In addition, since the clearance between the rotor and the casing can be maintained stably, it is possible to prevent the seal material from being damaged due to uneven wear, the generation of abnormal noise, the leakage of the heat medium, etc., and the smooth distribution of the heat medium. Can be planned.

It is a perspective view which shows one Embodiment of this invention. It is sectional drawing along the axis line of the rotor of embodiment shown in FIG. It is sectional drawing along the axis line of the rotor of the modification of embodiment shown in FIG.

1 and 2 show an embodiment of the present invention. As for the rotary joint of this embodiment, the main member is formed with metal materials, such as steel materials. Of these, the rotor 1 has a cylindrical shape centered on an axis O having a constant outer diameter except for a mounting portion and a flange portion described later. The first end (one end) 1A in the direction of the axis O of the rotor 1 (the lower left portion in FIG. 1 and the left portion in FIG. 2) has an outer diameter that is one step smaller than the rotor 1 centered on the axis O. The cylindrical inner tube 2 is inserted and supported by a support plate 3 extending in the radial direction along a plane including the axis O, and the space between the rotor 1 and the inner tube 2 and the inner tube 2 This space is open at one end of the rotor 1. In the present application, the left end in FIG. 2, that is, one end is defined as a first end, and the right end in FIG. 2, that is, the other end is defined as a second end.

Further, an annular plate-like attachment portion 4 is provided on the outer periphery of the one end portion 1A of the rotor 1, and the end portion 1A is not illustrated via the attachment portion 4, and a dryer body of a steam tube dryer or a roll of a heating roll. By being mounted coaxially with the rotation axis of a rotating body such as a main body, the rotor 1 is connected to the rotating body and rotated integrally around the axis O. The space in the inner tube 2 of the rotor 1 is connected to the heat medium discharge side of the rotating body to serve as a heat medium discharge flow path 5. On the other hand, the space between the rotor 1 and the inner tube 2 is connected to the heat medium supply side of the rotating body to serve as a heat medium supply flow path 6.

In the one end 1A of the rotor 1, on the second end (other end) 1B side (the upper right side in FIG. 1 and the right side in FIG. 2) of the rotor 1 opposite to the one end 1A in the axis O direction, The supply flow path 6 is sealed by the first partition wall 7A. The discharge channel 5 is open to the first partition wall 7A, and the discharge channel 5 and the supply channel 6 are hermetically isolated. Further, a second partition 7B is provided at a position spaced from the first partition 7A in the rotor 1 toward the other end 1B side, and the first and

second partitions

7A and 7B in the rotor 1 are provided. The portion in between is a heat medium discharge chamber 8 communicating with the discharge flow path 5.

On the other hand, the portion on the other end 1B side of the second partition wall 7B is isolated from the discharge chamber 8 and the discharge flow path 5 to be the heat release chamber 9 as the first heat release portion in the present embodiment. . The heat radiation chamber 9 has a circular opening 9A on the other end face of the rotor 1 and opens to the outside, that is, is open to the atmosphere. In the rotor 1, a plurality of through holes extending perpendicularly to the axis O are formed at positions of the supply flow path 6 and the discharge chamber 8 at intervals in the circumferential direction. The outlet is 8A.

Further, in the present embodiment, a flange portion 10 is provided on the other end portion 1B side of the rotor 1 so as to project to the outer peripheral side in the radial direction with respect to the axis O, which is the second heat radiating portion in the present embodiment. . The flange portion 10 is formed in an annular plate shape having a larger outer diameter than the rotor 1 having an opening portion 10A having the same diameter as the opening portion 9A of the heat radiation chamber 9 at the center thereof. It is arranged at the other end of the rotor 1 with the axis O as the center perpendicular to the axis O so as to match.

On the outer periphery of the rotor 1, a casing 11 that is fixed in a non-rotating manner with respect to the rotor 1 that is rotated around the axis O as described above is disposed, and the rotor 1 is rotatable in the casing 11. Supported. The casing 11 has a cylindrical shape centering on an axis O having an inner diameter larger than the outer diameter of the rotor 1. A first end (one end) and a second end (the other end) in the direction of the axis O are first perpendicular to the axis O having through

holes

12A and 13A centering on an axis O having an inner diameter into which the rotor 1 can be inserted.

Second partition walls

12 and 13 are provided. In addition, a third partition wall 14 having a through hole 14A slightly larger than the through

holes

12A and 13A is provided between the first and

second partition walls

12 and 13. A casing flange portion 11 A is provided on the outer periphery of the other end portion of the casing 11 so as to project to the outer peripheral side.

Among these, the space on the one end side in the axis O direction between the first and

third partition walls

12 and 14 serves as a supply communication chamber 15 that communicates with the supply flow path 6 via the supply port 6A of the rotor 1. A supply pipe 15 A that communicates with the supply communication chamber 15 and is connected to a heat medium supply path to the rotary joint is provided on the outer periphery of the casing 11 at the position of the supply communication chamber 15. Further, the space on the other end side in the axis O direction between the second and

third partition walls

13 and 14 is connected to the discharge chamber 8 and the discharge flow path 5 via the discharge port 8A of the rotor 1. A discharge pipe 16A that communicates with the discharge communication chamber 16 and is connected to a heat medium discharge path from the rotary joint is provided on the outer periphery of the casing 11 at the position of the discharge communication chamber 16.

Each of the supply pipe 15A and the discharge pipe 16A has a center line disposed at the same position as the center line of the supply port 6A and the discharge port 8A in the direction of the axis O, and the inner diameter thereof is the supply port 6A and the discharge port. It is larger than the inner diameter of 8A. Further, the inner diameter of the supply pipe 15A is larger than the inner diameter of the discharge pipe 16A, and the supply pipe 15A and the discharge pipe 16A are provided on the opposite sides in the circumferential direction of the casing 11.

Further, the first and

second partition walls

12 and 13 of the casing 11 are provided with a sealing material 17 between the through

holes

12A and 13A and the outer peripheral surface of the rotor 1, and these sealing materials 17 are disposed. Is a so-called braided gland packing having a square cross section and made of a braided string of expanded graphite and carbon fiber in this embodiment. Here, in the present embodiment, the

seal mounting portions

12B and 13B are provided so that the through

holes

12A and 13A are enlarged by one step on the outer side in the axis O direction of the first and

second partition walls

12 and 13, respectively. . The space (stuffing box) formed between the inner peripheral surfaces of these

seal mounting portions

12B and 13B and the outer peripheral surface of the rotor 1 is filled with the sealing material 17 as described above, and has an L-shaped cross section. The heat medium is sealed by being tightened by an annular packing presser 18.

In addition, a bush 19 is interposed between the through hole 14 A of the third partition wall 14 and the rotor 1. In the present embodiment, the bush 19 is a sliding bearing that seals between the supply communication chamber 15 and the discharge communication chamber 16 and also has a function of a bearing that rotatably supports the rotor 1. An oil-impregnated bearing in which a base material such as cast iron is impregnated with a lubricant (lubricating oil). The bush 19 is fitted between the inner peripheral surface of the through hole 14A and the outer peripheral surface of the rotor 1 and is attached to the third partition wall 14 by bolting or the like.

On the other hand, the other end of the casing 11 is provided with an extending portion 20 extending in a cylindrical shape with a gap on the outer peripheral side of the rotor 1. The extending portion 20 includes a barrel portion 20A whose outer shape centering on the axis O is cylindrical, and an annular flange portion 20B extending from both ends of the barrel portion 20A in the direction of the axis O to the outer peripheral side. 20C, and an extended flange portion 20B on one end side in the direction of the axis O is fixed to the casing flange portion 11A and attached to the other end of the casing 11. The seal attaching portion 13B and the packing retainer 18 on the second partition wall 13 side of the casing 11 are disposed inside the trunk portion 20A, and the extending flange portion 20C on the other end side of the extending portion 20 is a flange of the rotor 1. It faces the portion 10 with an interval in the direction of the axis O.

And between this extension flange part 20C and the flange part 10 of the rotor 1, the turning bearing (rolling bearing) is interposed as the bearing member 21 in this embodiment.
That is, the bearing member 21 is like an inner ring attached to one of the flange portion 10 and the extended flange portion 20C and an outer ring attached to the other, and a ball interposed between the inner and outer rings so as to be able to roll. For example, a ball bearing including a rolling element, and a lubricant such as grease is sealed between inner and outer rings on which the rolling element rolls.

In such a bearing member 21, the inner and outer rings are attached to the outer peripheral portions of the flange portion 10 and the extending flange portion 20 C projecting outward, and the casing 11 is supplied in the radial direction with respect to the axis O as shown in FIG. 2. The

discharge communication chambers

15 and 16 are arranged in an annular shape around the axis O on the outer peripheral side. Accordingly, in the present embodiment, the bearing member 21 includes the discharge channel 5, the supply channel 6, and the discharge chamber 8 of the rotor 1 that are the flow path of the heat medium, and the casing 11 that is the communication chamber that communicates with these. From the supply communication chamber 15 and the discharge communication chamber 16, the heat dissipating chamber 9 and the extension portion 20 are provided so as to be disposed at a position away from the other end portion 1 B side in the axis O direction and the flange portion 10. By providing the flange portion 20 C, the flange portion 20 C is disposed at a position distant from the radially outer peripheral side with respect to the axis O.

Further, the extending portion 20 includes a fin 22 projecting radially outward with respect to the axis O as a third heat radiating portion in the present embodiment, and a radial direction with respect to the axis O as a fourth heat radiating portion in the present embodiment. An opening 23 that penetrates the extension 20 is provided. In the present embodiment, a plurality (four) of fins 22 are provided at equal intervals in the circumferential direction on the outer periphery of the trunk portion 20 A of the extending portion 20. 4) openings 23 are provided at equal intervals in the circumferential direction.

The fin 22 extends from the outer periphery of the trunk portion 20A of the extending portion 20 along the plane including the axis O with a constant protrusion amount in the radial direction, and extends between the extending flange portions 20B and 20C in the axis O direction. It is formed in a flat plate shape that extends. Further, the opening 23 penetrates in the radial direction so as to cut out the body portion 20A of the extending portion 20 substantially entirely with a small gap between the extending flange portions 20B, 20C and the fins 22. Therefore, each opening 23 is formed in a rectangular shape when viewed from the outer peripheral side.

In such a rotary joint of this embodiment, the heat medium such as high-temperature steam supplied from the supply pipe 15A to the supply communication chamber 15 of the casing 11 is supplied to the rotor 1 rotated around the axis O as described above. For example, it is supplied to a heating pipe on the heating medium supply side of a rotating body such as a dryer main body rotating by a steam tube dryer from the port 6A and used for heating and drying the object to be processed. Further, the heat medium used for heating and drying the workpiece in this way is discharged from the heat medium discharge side of the rotating body to the discharge flow path 5 of the rotor 1, passes through the discharge chamber 8, and passes through the discharge port 8A to the discharge communication chamber. 16 and the discharge pipe 16A.

In the rotary joint configured as described above, the bearing member 21 communicates with the discharge flow path 5, the supply flow path 6, and the discharge chamber 8 of the rotor 1, which are flow paths through which the high-temperature heat medium flows. Similarly, the rotor 1 is rotatably supported with respect to the supply communication chamber 15 and the discharge communication chamber 16 of the casing 11 which are communication chambers through which a high-temperature heat medium flows. In addition, the bearing member 21 is disposed at a position away from at least one (both in the present embodiment) of the other end 1B side of the rotor 1 in the axis O direction and the radially outer side of the axis O. ing. Further, at least one of the discharge flow path 5, the supply flow path 6, the discharge chamber 8, and the bearing member 21, and the supply communication chamber 15, the discharge communication chamber 16, and the bearing member 21 ( In this embodiment, both of them are also provided with the heat radiation chamber 9, which is the first to fourth heat radiation parts, the flange part 10, the fins 22 of the extension part 20, and the opening part 23.

Therefore, in addition to the bearing member 21 being separated from the flow path and the communication chamber in this way, the heat transmitted to the bearing member 21 can be dissipated by the heat radiating portion, so that the bearing member 21 is exposed to a high temperature. Can be avoided. For this reason, even if a general slewing bearing (rolling bearing) as in the present embodiment is used as the bearing member 21 as it is, seizure does not occur due to loss of the lubricant and the rotor 1 is stabilized. Thus, it can be rotatably supported around the axis O. For this reason, the structure of the bearing member 21 does not become complicated.

In addition, since the rotor 1 can be stably supported so as to be rotatable around the axis O in this way, the outer peripheral surface of the rotor 1 that rotates integrally with the rotating body and the casing 11 that is fixed to the rotor 11 in a non-rotating manner. The clearances between the first to third partition walls 12 to 14 and the through holes 12A to 14A can also be stably maintained. For this reason, when the axis O is arranged horizontally like a rotary joint of a steam tube dryer, as a sealing material 17 or bush 19 for sealing between them, a gland packing, a sliding bearing, etc. are used as in this embodiment. Even if it is used, it is possible to prevent damage to the sealing material 17 and the bush 19 due to uneven wear, generation of abnormal noise, leakage of the heat medium, and the like. Further, when a gland packing, a sliding bearing, or the like is used as in the present embodiment, the supply and discharge of the heat medium is smoothly performed, and the structure of the bearing member 21 is simplified, thereby reducing the cost. Can be encouraged.

On the other hand, in the present embodiment, as the first heat dissipating part among the heat dissipating parts, the discharge flow path 5, the supply flow path 6, and the discharge chamber 8 that are heat medium flow paths are provided on the other end 1 B side of the rotor 1. A heat radiating chamber 9 is provided outside the rotor 1 at the other end of the rotor 1 and opened to the outside through an opening 9A. According to such a heat radiating chamber 9, the heat transmitted from the discharge flow path 5, the supply flow path 6, and the discharge chamber 8 of the rotor 1 is dissipated from the outer periphery of the heat radiating chamber 9 and also from the inside of the heat radiating chamber 9. It is possible to prevent the bearing member 21 from being exposed to a high temperature by being diffused to the outside through 9A.

In the present embodiment, as the second heat radiating portion provided in the rotor 1, the flange portion 10 is provided on the other end portion 1 B side of the rotor 1 so as to project outward in the radial direction with respect to the axis O. The bearing member 21 is attached to the outer peripheral part of the. For this reason, even if heat is transmitted from the other end 1B of the rotor 1, it is dissipated while reaching the outer peripheral side of the flange 10, and the flange 10 rotates integrally with the rotation of the rotor 1. A high heat dissipation effect can be obtained by cutting.

Furthermore, in the present embodiment, the other end of the casing 11 on the same side as the other end 1B of the rotor 1 in the direction of the axis O is extended in a cylindrical shape with an interval around the outer periphery of the other end 1B of the rotor 1. An outlet 20 is provided. Accordingly, the heat transmitted from the supply communication chamber 15 and the discharge communication chamber 16 of the casing 11 is communicated with the discharge flow path 5, the supply flow path 6, and the discharge chamber 8 of the rotor 1 to supply and discharge the high-temperature heat medium. Is also dissipated while traveling through the extension 20. And in this embodiment, since the fin 22 and the opening part 23 are provided in this extension part 20 as the 3rd, 4th heat radiation part among the said heat radiation parts, it promotes efficient heat dissipation. Can do.

That is, since the surface area of the extended portion 20 can be increased by providing the fin 22 in the extended portion 20, it is possible to improve the heat dissipation effect. Moreover, when the opening part 23 is provided in the extension part 20, while being able to dissipate the heat which propagates the extension part 20 from the inner periphery of this opening part 23, the other end part 1B of the rotor 1 in the extension part 20 Is exposed from the opening 23. Therefore, the heat transmitted from the flow path of the rotor 1 to the other end 1 B can be dissipated through the opening 23 without being trapped in the extension 20.

In addition, you may provide such a fin and opening part in the outer peripheral part of the other end part 1B of the rotor 1, or the flange part 10. FIG. If an opening is provided in the other end 1B of the rotor 1 provided with the heat radiating chamber 9, the heat dissipated in the heat radiating chamber 9 is discharged between the opening 20 other than the opening 9A and the extending portion 20. be able to. Further, if the flange portion 10 is also provided with an opening portion, the heat thus discharged can be discharged to the outside from the opening portion other than the opening portion 23 of the extending portion 20. Further, if fins are provided on the outer periphery of the other end portion 1B of the rotating rotor 1 or the flange portion 10, it is possible to promote more efficient heat dissipation.

On the other hand, in the present embodiment, the bearing member 21 is provided with the supply communication chamber 15 and the discharge of the casing 11, which is a communication chamber with the discharge channel 5, the supply channel 6, and the discharge chamber 8 of the rotor 1. The communication chamber 16 is disposed at a position away from both the other end 1 B side in the axis O direction and the outer peripheral side in the radial direction with respect to the axis O. However, if the heat transfer can be suppressed by the heat radiating portion, it may be separated only in the direction of the axis O and may be in the same position in the radial direction. You may just be away. However, in these cases, the rotor 1 and the extending portion 20 that are long in the direction of the axis O are necessary, or the bearing member 21 having a large diameter is necessary. Therefore, it is desirable that the bearing member 21 is disposed at a position away from the flow path and the communication chamber in both the axis O direction and the radial direction as in the present embodiment.

In addition, when the bearing member 21 is disposed at a position away from both the flow path and the communication chamber in both the axis O direction and the radial direction, or when only separated in the axis O direction, the rotating body From one end of the rotor 1 connected to the seal member 17, the bushing 19 and the bearing member 21, which also have a bearing function, are alternately arranged in the direction of the axis O toward the other end side. For this reason, one end 1 A of the rotor 1 is reliably supported by the rotating body and the bush 19, and the other end 1 B is reliably supported by the bush 19 and the bearing member 21 so as to be rotatable around the axis O. Therefore, the clearance between the outer peripheral surface of the rotor 1 and the through

holes

12A and 13A of the first and

second partition walls

12 and 13 at both ends of the casing 11 is more stably maintained even when the axis O is lateral. Can do.

Therefore, it is possible to use a gland packing as in the present embodiment as the sealing material 17 disposed between them, and it is possible to improve maintainability such as adjustment and replacement of the sealing material 17, An inexpensive rotary joint can be provided. Note that a slight clearance is required between the bush 19 and the outer peripheral surface of the rotor 1 in order to rotatably support the rotor 1 by a non-elastic bush 19 such as a sealing material 17 made of gland packing. However, since the steam that passes through the supply communication chamber 15 and the discharge communication chamber 16 sealed by the bush 19 is high-temperature steam in a steam tube dryer or the like, even if a slight heat medium leaks from this clearance. It doesn't matter.

Further, in this embodiment, the braided gland packing is used as the sealing material 17 which is the gland packing as described above. However, for example, as in a modification of the above-described embodiment shown in FIG. 3, a sealing material 24 made of a die mold gland packing may be used. Note that, in the modification shown in FIG. 3, the same reference numerals are assigned to the parts other than the sealing material 24 in common with the above embodiment.

Further, the distance between the flow path of the heat medium and the communication chamber and the bearing member 21 as described above is the length in the direction of the axis O of the other end 1B of the rotor 1 to which heat is transmitted and the flange from the outer periphery of the other end 1B. The sum of the length in the radial direction to the bearing member 21 along the portion 10 or the sum of the length in the direction of the axis O of the extending portion 20 and the length in the radial direction to the bearing member 21 along the extending flange portion 20C. However, it is desirably 200 mm or more, and more desirably 400 mm or more. If the distance is shorter than this, there is a possibility that sufficient heat dissipation cannot be achieved until the bearing member 21 is reached, depending on the temperature of the heat medium and the heat radiation effect of the heat radiation portion.

On the other hand, in the present embodiment, the heat radiating chamber 9 and the flange portion 10 are provided as the first and second heat radiating portions between the flow path of the heat medium and the bearing member 21, and between the communication chamber and the bearing member 21. The extended portion 20 is provided with fins 22 and openings 23 as third and fourth heat radiating portions. However, the heat radiation part may be provided only between either one. For example, since the extending part 20 is disposed on the outer periphery of the rotor 1 and exposed to the outside air, the fins 22 and the opening part 23 are not provided, or the opening part 23 is covered with a cover as necessary. Also good.

Further, the other end portion 1B of the rotor 1 provided with such a heat radiating portion and the extended portion 20 of the casing 11 are air-cooled by blowing air with a fan or the like, or in some cases water-cooled to forcibly. Cooling may be performed. In the present embodiment, the rotor 1 is provided with a heat medium discharge channel 5 and a supply channel 6, and the casing 11 is provided with a heat medium supply communication chamber 15 and a discharge communication chamber 16. One rotary joint is used to supply and discharge the heat medium to the rotating body. However, only one of the flow path and the communication chamber may be provided to supply or discharge the heat medium only.

In the present embodiment, the space in the inner tube 2 of the rotor 1 is connected to the heat medium discharge side of the rotating body to serve as a heat medium discharge flow path 5, while the space between the rotor 1 and the inner tube 2. The space is connected to the heat medium supply side of the rotating body and serves as a heat medium supply flow path 6. However, conversely, the space in the inner pipe 2 is used as the heat medium supply flow path 6, and the space between the rotor 1 and the inner pipe 2 is used as the heat medium discharge flow path 5 to communicate with these. The communication chamber may also be configured so that supply and discharge are reversed.

According to the present invention, there is provided a rotary joint capable of preventing seizure and stably supporting a rotor so as to be rotatable about an axis without causing complicated structure and high cost. be able to.

1 Rotor 1A First end (one end) of the rotor 1
1B Second end of the rotor 1 (the other end)
2 Inner pipe 4 Mounting portion 5 Discharge flow path 6 Supply flow path 6A Supply port 8 Discharge chamber 8A Discharge port 9 Heat radiation chamber (first heat radiation portion)
9A Opening part of heat radiation chamber 9 10 Flange part (second heat radiation part)
10A Opening of flange portion 11 Casing 12-14 First through third partition walls 12A-14A Through hole of first through third partition walls 12-14 15 Supply communication chamber 15A Supply pipe 16 Discharge communication chamber

16A Discharge Pipes

17 and 24 Sealing material 18 Packing retainer 19 Bushing 20 Extension part 20C Extension flange part 21 Bearing member 22 Fin (third heat radiation part)
23 Opening part of extension part 20 (4th thermal radiation part)
O Rotor 1 axis

Claims

A cylindrical rotor that is rotated around an axis, a casing disposed on the outer periphery of the rotor, and a bearing member that is interposed between the rotor and the casing and rotatably supports the rotor on the casing. Prepared,
Inside the rotor, a flow path is formed which opens to the first end in the axial direction of the rotor and through which the heat medium flows, and communicates with the flow path between the casing and the rotor. Communication room is formed,
The bearing member is disposed at a position away from the flow path and the communication chamber on at least one side of the second end side in the axial direction and the outer peripheral side in the radial direction with respect to the axial line. A rotary joint in which a heat radiating portion is provided between at least one of a path and the bearing member and between the communication chamber and the bearing member.
The rotary joint according to claim 1, wherein a heat radiating chamber that is isolated from the flow path and opens to the outside of the rotor is formed on the second end portion side of the rotor as the heat radiating portion.
The rotary joint according to claim 1 or 2, wherein a flange portion is provided on the second end portion side of the rotor as a heat radiating portion that projects to a radially outer peripheral side with respect to the axis.
On the second end side of the casing, there is provided an extending portion extending in a cylindrical shape with a space around the outer periphery of the rotor, and this extending portion protrudes on the outer peripheral side in the radial direction with respect to the axis. The rotary joint as described in any one of Claims 1-3 in which the fin to perform is provided as the said thermal radiation part.
On the second end side of the casing, there is provided an extending portion that extends in a cylindrical shape with a space around the outer periphery of the rotor, and the extending portion is provided in the radial direction with respect to the axis. The rotary joint as described in any one of Claims 1-4 in which the opening part which penetrates is provided as the said thermal radiation part.