CN107407449A - Swivel joint - Google Patents

Abstract

Swivel joint has：Rotor (1), it rotates around axes O；Housing (11), it is disposed in the periphery of rotor (1)；And parts of bearings (21),Rotor (1) is supported on housing (11) by it in a manner of rotating freely,Formed with the stream (5 in the 1st end (one end) (1A) in axis (O) direction opening and heating medium circulation in rotor (1),6),Between housing (11) and rotor (1) formed with stream (5,6) communication chamber (15 of connection,16),Parts of bearings (21) is disposed in the 2nd end (the other end) (1B) side in axis (O) direction and relative to remote stream (5 at least one party in the outer radial periphery side of axis (O),And communication chamber (15 6),16) position,In stream (5,6) between parts of bearings (21) and communication chamber (15,16) between parts of bearings (21) at least one party be provided with radiating part (9,10,22,23).

Description

Rotary joint

technical field

The present invention relates to a rotary joint for supplying heat medium such as high-temperature steam to rotating bodies such as steam pipe dryers and heating rollers, or for discharging heat medium such as high-temperature steam.

This application claims priority based on Japanese Patent Application No. 2015-101754 filed in Japan on May 19, 2015, and uses the content thereof here.

Background technique

As such a rotary joint, for example, Patent Document 1 proposes a rotary joint including: a housing with one end side open; and a tubular rotor rotatably supported in the housing by a pair of bearings. In addition, one end is installed coaxially with the rotating body; a spacer is installed so that a gap is provided between the pair of bearings; and an inner pipe is installed in the housing so as to pass through the inner side of the rotor, and the rotary joint is constituted by, A heat medium is supplied into the rotating body through an inner tube, and a heat medium used for heating in the rotating body is discharged through a gap between the inner tube and the rotor.

In addition, Patent Document 2 proposes a sealing material for such a rotary joint that contains a condensed polycyclic polynuclear aromatic resin as a matrix resin, reinforcing fibers composed of polyphenylene sulfide fibers or carbon fibers, and carbon such as lamp black. A seal containing fillers such as fluororesins or silicon compounds. In addition, Patent Document 1 also describes the use of a special carbon seal ring as a seal ring for sealing the inside of the housing and the inside of the rotor.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2007-120694

Patent Document 2: Japanese Patent Laid-Open No. 2007-016173

Contents of the invention

The problem to be solved by the invention

Here, the bearings in the rotary joint described in Patent Document 1 are rolling bearings (ball bearings) in which rolling elements such as balls are mounted between inner and outer rings, but the rolling bodies are directly mounted on the outer peripheral portion of the rotor through which the heat medium flows. , may cause sintering due to heat medium. Therefore, in the rotary joint described in Patent Document 1, the outer periphery of the spacer is located outside the center position of the rolling elements to provide a flow path through which grease flows toward each bearing. However, in the case of Patent Document 1, the structure of the rotary joint is complicated.

In addition, for example, a seal made of carbon excellent in heat resistance and lubricity, such as the seal ring described in Patent Document 1 and the seal described in Patent Document 2, is also considered to be used as a sliding bearing for supporting the rotor. However, in a rotary joint in a steam tube dryer or a heating roll, it is generally used so that the axis of the rotor is oriented laterally. Therefore, when such a sliding bearing is used, uneven wear tends to occur in the lower part of the bearing due to the weight of the rotor, and sudden breakage may occur, abnormal noise may occur due to eccentricity, or heat medium may leak from the worn part. . Furthermore, the special carbon seals described in Patent Documents 1 and 2 are expensive and have poor maintainability such as replacement.

The present invention was accomplished under such a background, and its object is to provide a rotary joint through which a high-temperature heat medium circulates, such as the above-mentioned steam pipe dryer and heating roller, without incurring complicated structure and high cost, and A rotor that rotates integrally with a rotating body is supported by a bearing member such as a general rolling bearing as a rotary joint that is stably rotatable around an axis.

means to solve the problem

In order to solve the above problems and achieve the object, the rotary joint of the present invention has: a cylindrical rotor that rotates around an axis; a housing that is disposed on the outer periphery of the rotor; and a bearing member that is attached to the rotor and the rotor. The rotor is rotatably supported by the housing between the housings, and a flow path through which the heat medium flows is formed in the interior of the rotor and opens at the (first end portion) of the rotor in the axial direction. , and a communication chamber communicating with the flow path is formed between the housing and the rotor, and the bearing member is disposed on the second end (the other end) side in the axial direction and on the side with respect to the axis. At least one of radially outer peripheral sides is away from the flow path and the communication chamber, and a heat dissipation portion is provided at least one of between the flow path and the bearing member and between the communication chamber and the bearing member.

In the rotary joint thus constituted, the bearing member is disposed on at least one of the other end side in the axial direction opposite to the one end of the rotor opening and the radially outer peripheral side with respect to the axis, away from the rotor through which the heating medium flows. The position of the flow path and the communication chamber between the rotor and the housing. In addition, since the heat dissipation part is provided in at least one of the separated flow passage and the bearing member, or between the communication chamber and the bearing member as described above, the heat transferred from the flow passage and the communication chamber can be dissipated by the heat dissipation part. distribute. Therefore, even when a general rolling bearing is used as the bearing member, the rotor can be stably supported rotatably around the axis without complicating the structure to prevent seizing.

Furthermore, since the rotor can be stably rotatably supported around the axis in this way, the gap between the rotor integrally rotating with the rotating body and the case fixed to the rotor so as not to rotate can also be stably maintained. Therefore, it is possible to provide a rotary joint that uses, for example, a gland gasket instead of a special seal as described in Patent Documents 1 and 2 as a seal that seals between the outer circumference of the rotor and the housing. Such a seal or a lubricating bush (sliding bearing) can also prevent damage or abnormal noise due to partial wear, prevent leakage of the heat medium, realize smooth circulation of the heat medium, and be inexpensive.

Here, as such a radiating portion, a radiating chamber that is isolated from the flow path and opens to the outside of the rotor can be formed on the other end side of the rotor. By forming such a cooling chamber between the flow path through which the heating medium of the rotor flows and the bearing member, it is possible to prevent the heat transferred from the heating medium from dissipating from the opening and the outer periphery of the cooling chamber to the outside, resulting in a high temperature of the bearing member.

In addition, when the heat dissipation portion is provided on the rotor as described above, a flange portion protruding toward the radially outer peripheral side with respect to the axis may be provided on the other end side of the rotor. In the above case, heat transferred from the heat medium can be dissipated through the flange portion, and since the flange portion rotates integrally with the rotor and the rotating body, a high heat dissipation effect can be obtained.

On the other hand, when the heat dissipation part is provided on the case where the communication chamber is provided between the rotor and the other end of the case, a tube extending in a cylindrical shape at a distance from the outer periphery of the rotor can be provided on the other end side of the case. An extension portion on which a fin protruding toward a radially outer peripheral side with respect to the axis is provided as the heat dissipation portion. Needless to say, heat is dissipated during the transfer process in the extension, and since the surface area of the extension is increased by the fins provided on the extension, the heat dissipation effect can be improved.

In addition, similarly, when an extension portion extending in a cylindrical shape at a distance from the outer periphery of the rotor is provided on the other end side of the housing, the extension portion may be provided with a An opening penetrating through the extending portion in the radial direction of the axis serves as the heat dissipation portion. By providing the opening, heat dissipation from the inner peripheral edge of the opening can be promoted, and since the other end of the rotor is exposed through the opening, heat transfer from the flow path of the rotor can also be dissipated.

In addition, the fins and openings of the heat radiation chamber of these rotors, the flange part, or the extension part of a case can be combined suitably and used. For example, a flange portion may be provided on the outer periphery of the other end portion of the rotor where the heat dissipation chamber is formed, or an opening portion may be provided between fins of the housing provided on the extension portion. In addition, 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 extension portion of the case.

Invention effect

As described above, according to the present invention, even if a general rolling bearing is used as the bearing member, the rotor can be stably rotatably supported around the axis without complicating the structure or increasing the cost. In addition, since the gap between the rotor and the housing can also be maintained stably, it is possible to prevent the damage of the seal due to partial wear or the generation of abnormal noise, and to prevent the leakage of the heat medium, etc., and to realize the smooth flow of the heat medium. circulation.

Description of drawings

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the embodiment shown in FIG. 1 along the axis of the rotor.

FIG. 3 is a cross-sectional view of a modified example of the embodiment shown in FIG. 1 along the axis of the rotor.

detailed description

1 and 2 show one embodiment of the present invention. The main components of the rotary joint according to this embodiment are formed of metal materials such as steel materials. Among them, the rotor 1 has a cylindrical shape with a constant outer diameter centered on the axis O except for a mounting portion and a flange portion which will be described later. In addition, in the first end (one end) 1A (the lower left side part in FIG. 1 and the left side part in FIG. 2 ) of the rotor 1 in the direction of the axis O, an outer diameter centering on the axis O is inserted. A cylindrical inner tube 2 smaller than the rotor 1, the inner tube 2 is supported by a support plate 3 extending in the radial direction along a plane including the axis O, between the rotor 1 and the inner tube 2 The space between them and the space in the inner tube 2 are opened at one end of the rotor 1 . In addition, in this application, the end part in the left direction of FIG. 2, that is, one end is defined as a 1st end, and the end part in the right direction of FIG. 2, that is, the other end is defined as a 2nd end.

In addition, an annular plate-shaped mounting portion 4 is provided on the outer periphery of one end portion 1A of the rotor 1, and the one end portion 1A is mounted to a dryer body and a heating roller of a steam tube dryer (not shown) through the mounting portion 4 . The rotation axis of the rotating body such as the roller body is coaxial, whereby the rotor 1 is connected to the rotating body and rotates integrally around the axis O. Furthermore, the space in the inner tube 2 of the rotor 1 is connected to the heat medium discharge side of the rotating body to form 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 and serves as a heat medium supply flow path 6 .

In addition, in the one end portion 1A of the rotor 1, the second end portion (the other end portion) 1B side of the rotor 1 opposite to the one end portion 1A in the direction of the axis O (the upper right side in FIG. is the right side), and the supply channel 6 is sealed by the first partition wall 7A. The discharge flow path 5 is opened on the first partition wall 7A, and the discharge flow path 5 and the supply flow path 6 are airtightly isolated. In addition, a second partition wall 7B is provided at a position spaced from the first partition wall 7A toward the other end 1B side in the rotor 1, and the gap between the first and second partition walls 7A, 7B in the rotor 1 is provided. A part serves as the discharge chamber 8 for the heat medium communicating with the discharge flow path 5 .

On the other hand, the portion on the other end portion 1B side of the second partition wall 7B is isolated from the discharge chamber 8 and the discharge flow path 5, and serves as the heat dissipation chamber 9 as the first heat dissipation portion in this embodiment. The heat dissipation chamber 9 has a circular opening 9A on the other end surface of the rotor 1 and is opened to the outside, that is, to the atmosphere. In addition, in the rotor 1, a plurality of through-holes extending perpendicular to the axis O are formed at intervals along the circumferential direction at positions of the supply flow path 6 and the discharge chamber 8, and these through-holes serve as heat medium supply channels. port 6A and discharge port 8A.

In addition, in this embodiment, a flange portion 10 protruding toward the radially outer peripheral side with respect to the axis O is provided on the other end portion 1B side of the rotor 1 to serve as a second heat dissipation portion in this embodiment. The flange portion 10 is formed in the shape of an annular plate having an opening 10A having the same diameter as the opening 9A of the cooling chamber 9 at its center and having an outer diameter larger than that of the rotor 1 so that these openings 9A, 10A coincide. The flange portion 10 is arranged perpendicular to the axis O at the other end of the rotor 1 with the axis O as the center.

The casing 11 is disposed on the outer periphery of such a rotor 1 , and the casing 11 is non-rotatably fixed to the rotor 1 that rotates about the axis O as described above, and the rotor 1 is rotatably supported by the casing. within 11. The housing 11 has a cylindrical shape centered on the axis O and having an inner diameter larger than the outer diameter of the rotor 1 . At the first end (one end) and the second end (other end) of the housing 11 in the direction of the axis O, first and second partition walls 12, 13 having through holes 12A, 13A perpendicular to the axis O are provided. , the through-holes 12A, 13A have an inner diameter capable of inserting the rotor 1 and are centered on the axis O. Moreover, the 3rd partition wall 14 which has the through-hole 14A slightly larger than the through-hole 12A, 13A is provided between these 1st, 2nd partition wall 12,13. Further, on the outer periphery of the other end portion of the case 11, a case flange portion 11A protruding toward the outer peripheral side is provided.

Among them, the space on one end side in the direction of the axis O between the first and third partition walls 12 and 14 serves as a supply communication chamber 15 communicating with the supply channel 6 via the supply port 6A of the rotor 1 . On the outer periphery of the casing 11 at the location of the supply communication chamber 15 , a supply pipe 15A is provided that communicates with the supply communication chamber 15 and is connected to a supply path for supplying the heat medium to the rotary joint. In addition, the space on the other end side of the axis O direction between the second and third partition walls 13 and 14 serves as a discharge communication chamber 16 that communicates with the discharge chamber 8 and the discharge channel 5 through the discharge port 8A of the rotor 1. A discharge pipe 16A is provided on the outer periphery of the housing 11 at the position of the communication chamber 16, and the discharge pipe 16A communicates with the discharge communication chamber 16 so as to be connected with a discharge path through which heat medium is discharged from the rotary joint.

In addition, these supply pipe 15A and discharge pipe 16A are arranged respectively so that their centerlines are at the same positions as the centerlines of the supply port 6A and the discharge port 8A in the axis O direction, and the inner diameters of the supply pipe 15A and the discharge pipe 16A are It is larger than the inner diameter of the supply port 6A and the discharge port 8A. In addition, 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 disposed on opposite sides to each other in the circumferential direction of the casing 11 .

Furthermore, on the first and second partition walls 12, 13 of the casing 11, seals 17 are attached between the through holes 12A, 13A and the outer peripheral surface of the rotor 1, and these seals 17 are A so-called braided gland gasket with a square cross-section and consisting of braided cords of expanded graphite and carbon fibers. Here, in the present embodiment, seal mounting portions 12B, 13B are provided on the outside in the direction of the axis O of each of the first and second partition walls 12, 13 so as to be larger in diameter than the through holes 12A, 13A. The space (stuff box) formed between the inner peripheral surface of these seal mounting parts 12B, 13B and the outer peripheral surface of the rotor 1 is filled with the above-mentioned seal 17, and is filled with an annular gasket having an L-shaped cross section. The pressing piece 18 is fastened, thereby sealing the heat medium.

In addition, a bush 19 is attached between the through hole 14A of the third partition wall 14 and the rotor 1 . In this embodiment, the bushing 19 is a sliding bearing that seals between the supply communication chamber 15 and the discharge communication chamber 16 and also functions as a rotatable bearing that supports the rotor 1, and is formed on a ring having an L-shaped cross section. An oil-impregnated bearing in which a lubricant (lubricating oil) is impregnated in a base material such as cast iron. In addition, the bushing 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, at the other end of the housing 11 , an extension portion 20 extending in a cylindrical shape at a distance from the outer peripheral side of the rotor 1 is provided. The extension part 20 has: a main body part 20A having a cylindrical shape centered on the axis O; 20B, 20C, the extension flange portion 20B on one end side in the axis O direction is fixed to the case flange portion 11A so as to be attached to the other end of the case 11 . The seal mounting portion 13B and the packing retainer 18 on the side of the second partition wall 13 of the case 11 are arranged inside the main body portion 20A, and the extension flange portion 20C on the other end side of the extension portion 20 is connected to the flange of the rotor 1 . The parts 10 are opposed to each other at intervals in the axis O direction.

Further, a slewing bearing (rolling bearing) is attached between the extended flange portion 20C and the flange portion 10 of the rotor 1 as the bearing member 21 in this embodiment.

That is, the bearing member 21 has an inner ring attached to one of the flange portion 10 and the extended flange portion 20C, an outer ring attached to the other of the flange portion 10 and the extended flange portion 20C, and is capable of rolling. For example, ball bearings, in which rolling elements such as balls are installed between the inner and outer rings by means of rolling elements, have lubricants such as grease sealed between the inner and outer rings where the rolling elements roll.

In such a bearing member 21, the above-mentioned inner and outer rings are mounted on the outer peripheral portions of the flange portion 10 protruding to the outer peripheral side and the extended flange portion 20C. As shown in FIG. The supply and discharge communication chambers 15 , 16 of the body 11 are arranged in an annular shape centered on the axis O at positions closer to the outer peripheral side. Therefore, in this embodiment, by providing the heat radiation chamber 9 and the extension portion 20, the bearing member 21 is arranged on the other end portion 1B side in the axis O direction away from the discharge flow path 5 of the rotor 1 which is a flow path of the heat medium. , the positions of the supply flow path 6 and the discharge chamber 8 and the supply communication chamber 15 and the discharge communication chamber 16 as communication chambers of the housing 11 communicating with them, and by providing the flange portion 10 and the extended flange portion 20C, the The bearing member 21 is disposed at a position away from the discharge flow path 5 , the supply flow path 6 , the discharge chamber 8 , the supply communication chamber 15 , and the discharge communication chamber 16 on the radially outer peripheral side with respect to the axis O.

Furthermore, on the extension part 20, there are provided fins 22 protruding toward the radially outer peripheral side relative to the axis O and openings 23 penetrating the extension part 20 along the radial direction relative to the axis O, wherein the fins 22 serve as In the third heat dissipation portion in this embodiment, the opening portion 23 serves as a fourth heat dissipation portion in this embodiment. In the present embodiment, on the outer periphery of the main body portion 20A of the extension portion 20, a plurality (four) of fins 22 are provided at equal intervals in the circumferential direction, and between these fins 22, a plurality (with fins 22) The same number of four) openings 23 of the sheet 22 are also provided at equal intervals in the circumferential direction.

The fins 22 are formed in a flat plate shape extending from the outer periphery of the main body portion 20A of the extension portion 20 with a certain amount of protrusion toward the radial direction along a plane including the axis O and extending the flange portions 20B, 20C in the axis O direction. extend between. In addition, the opening 23 penetrates in the radial direction so that the main body portion 20A of the extension portion 20 is substantially completely cut away at a small interval between the extension flange portions 20B, 20C and the fins 22 . The opening 23 is formed in a rectangular shape when viewed from the outer peripheral side.

In such a rotary joint of the present embodiment, the heat medium such as high-temperature steam supplied from the supply pipe 15A to the supply communication chamber 15 of the housing 11 passes through the supply port 6A of the rotor 1 rotating around the axis O as described above. The flow path 6 is supplied to, for example, a heating pipe on the heat medium supply side of a rotating body such as a rotating dryer body of a steam tube dryer, and is used for heating and drying the object to be processed. In addition, the heat medium used for heating and drying the object 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 communication chamber 16 and the discharge pipe from the discharge port 8A. 16A is discharged.

Further, in the rotary joint having the above structure, the bearing member 21 is opposed to the discharge flow path 5, the supply flow path 6, and the connection between the discharge chamber 8 and the housing 11 of the rotor 1 as flow paths through which the high-temperature heat medium flows. The supply communication chamber 15 and the discharge communication chamber 16 , which are communication chambers through which the high-temperature heat medium is communicated, support the rotor 1 so as to be rotatable. In addition, the bearing member 21 is disposed at a position away from at least one (in this embodiment, both) sides of the other end portion 1B side in the axis O direction of the rotor 1 and the radially outer peripheral side with respect to the axis O. And, at least one of the discharge channel 5, the supply channel 6, the discharge chamber 8 and the bearing member 21 divided in this way, and the supply communication chamber 15, the discharge communication chamber 16 and the bearing member 21 (in this embodiment, Among them, still both) are provided with the heat dissipation chamber 9 as the first to fourth heat dissipation portions, the flange portion 10 , the fins 22 of the extension portion 20 , and the opening portion 23 .

Therefore, not only the bearing member 21 is kept away from the flow path and the communication chamber, but also the heat transferred to the bearing member 21 can be dissipated through the heat dissipation portion, so that the bearing member 21 can be prevented from being exposed to high temperature. Therefore, even if a general slewing bearing (rolling bearing) as in this embodiment is used as the bearing member 21 as it is, the rotor 1 can be stably supported rotatably about the axis O without causing seizure due to lack of lubricant or the like. Therefore, the structure of the bearing member 21 is not complicated.

In addition, since the rotor 1 can be supported stably and rotatably about the axis O in this way, the outer peripheral surface of the rotor 1 that rotates integrally with the rotating body and the first part of the housing 11 fixed to the outer peripheral surface in a non-rotatable manner. The gaps between the through holes 12A to 14A of the third partition walls 12 to 14 can also be stably maintained. Therefore, when the axis O is arranged in the horizontal direction as in the rotary joint of a steam pipe dryer, as the seal 17 and the bush 19 that seal between them, even if a gland gasket or a sliding bearing is used as in this embodiment etc., it is also possible to prevent breakage of the seal 17 or the bush 19 and generation of abnormal noise due to uneven wear, and to prevent leakage of the heat medium. Furthermore, when a gland gasket or a sliding bearing is used as in the present embodiment, smooth supply and discharge of the heat medium can be realized, and the structure of the bearing member 21 can also be simplified, thereby promoting cost reduction.

On the other hand, in the present embodiment, as the first heat dissipation portion among the heat dissipation portions described above, a heat dissipation chamber 9 is provided on the other end portion 1B side of the rotor 1, and the heat dissipation chamber 9 is connected to the discharge flow as a flow path of the heat medium. The passage 5, the supply flow passage 6, and the discharge chamber 8 are isolated, and the other end of the rotor 1 is opened to the outside through an opening 9A. According to such heat dissipation chamber 9, the heat transferred from the discharge flow path 5, the supply flow path 6, and the discharge chamber 8 of the rotor 1 can be dissipated from the outer periphery of the heat dissipation chamber 9, and the heat can also be released from the inside of the heat dissipation chamber 9 through the opening. 9A is emitted to the outside, preventing the bearing part 21 from being exposed to high temperature.

In addition, in this embodiment, as the second heat dissipation portion provided on the rotor 1, the flange portion 10 projecting toward the radially outer peripheral side with respect to the axis O is provided on the other end portion 1B side of the rotor 1. A bearing member 21 is attached to the outer peripheral portion of the flange portion 10 . Therefore, even if heat is transferred from the other end portion 1B of the rotor 1, since the heat is dissipated while reaching the outer peripheral side of the flange portion 10, and the flange portion 10 integrally rotates with the rotation of the rotor 1, it is possible to Get high heat dissipation effect against the wind.

Furthermore, in this embodiment, on the other end portion of the housing 11 on the same side as the other end portion 1B of the rotor 1 in the direction of the axis O, there is provided a The extension part 20 extending in a cylindrical shape. Therefore, the heat transferred from the supply communication chamber 15 and the discharge communication chamber 16 of the casing 11 communicating with the discharge flow passage 5 , the supply flow passage 6 , and the discharge chamber 8 of the rotor 1 and supplying or discharging high-temperature heat medium also flows. The extension 20 is delivered and emitted during the delivery. Furthermore, in the present embodiment, since the fins 22 and the openings 23 are provided on the extension portion 20 as the third and fourth heat dissipation portions among the above heat dissipation portions, effective heat dissipation can be promoted.

That is, since the surface area of the extension part 20 can be increased by providing the fins 22 on the extension part 20, the heat radiation effect can be improved. In addition, when the opening 23 is provided in the extension 20 , the heat transferred in the extension 20 can be dissipated from the inner peripheral edge of the opening 23 , and the other end 1B of the rotor 1 inside the extension 20 can be dissipated. Exposed from the opening 23 . Therefore, the heat of the rotor 1 transferred from the flow path to the other end portion 1B can be dissipated through the opening portion 23 without being trapped in the extension portion 20 .

In addition, such fins and openings may be provided on the other end portion 1B of the rotor 1 or the outer peripheral portion of the flange portion 10 . If an opening is provided at the other end 1B of the rotor 1 where the heat dissipation chamber 9 is provided, the heat dissipated in the heat dissipation chamber 9 can be directed from the above-mentioned openings other than the opening 9A to between the opening and the extension portion 20. discharge. Furthermore, if an opening is also provided in the flange portion 10 , the heat discharged in this way can be discharged to the outside from the above-mentioned openings other than the opening 23 of the extension portion 20 . Furthermore, if fins are provided on the outer periphery of the other end portion 1B of the rotating rotor 1 or on the flange portion 10, more effective heat dissipation can be promoted.

On the other hand, in this embodiment, the bearing member 21 is arranged on the other end portion 1B side in the axis O direction and on the radially outer peripheral side with respect to the axis O, both away from the discharge flow of the heat medium flow path of the rotor 1 . The positions of the passage 5, the supply flow passage 6, the discharge chamber 8 and the supply communication chamber 15 and the discharge communication chamber 16 of the housing 11 as communication chambers. However, as long as heat transfer can be suppressed by the radiating portion, they may be separated only in the direction of the axis O and located at the same position in the radial direction, or conversely, may be located at the same position in the direction of the axis O but only on the radially outer peripheral side. Up and away. However, in these cases, the rotor 1 or the extension 20 is required to be long in the direction of the axis O, or the bearing member 21 is required to have a large diameter. Therefore, as in the present embodiment, it is desirable to arrange the bearing member 21 at a position away from the flow path or the communication chamber in both the axis O direction and the radial direction.

In addition, in this way, when the bearing member 21 is arranged at a position away from the flow path or the communication chamber in both the direction of the axis O and the radial direction, or in the case of being far away from the flow path or the communication chamber only in the direction of the axis O, sealing The member 17 , the bush 19 functioning as a bearing, and the bearing member 21 are alternately arranged from one end of the rotor 1 connected to the rotating body toward the other end side along the axis O direction. Therefore, one end 1A of rotor 1 is rotatably supported about the axis O by the rotating body and the bush 19 , and the other end 1B is rotatably supported about the axis O by the bush 19 and the bearing member 21 . Therefore, even if the axis O is oriented laterally, the gap between the outer peripheral surface of the rotor 1 and the through holes 12A, 13A of the first and second partition walls 12, 13 at both ends of the housing 11 can be maintained more stably.

Therefore, a gland gasket can be used as the seal 17 disposed therebetween as in the present embodiment, and maintenance such as adjustment and replacement of the seal 17 can be improved, and an inexpensive rotary joint can be provided. In addition, in order to rotatably support the rotor 1 through the inelastic bush 19 such as the seal 17 made of a gland packing, a slight gap is required between the bush 19 and the outer peripheral surface of the rotor 1 . However, high-temperature steam flows through the supply communication chamber 15 and the discharge communication chamber 16 sealed by the bushing 19 and through the steam pipe drier, etc. Not a problem.

In addition, in this embodiment, as mentioned above, the woven gland gasket is used as the packing 17 which is a gland gasket. However, for example, as in the modified example of the above-mentioned embodiment shown in FIG. 3 , it is possible to use the packing 24 made of a die-molded gland liner. In addition, in the modified example shown in this FIG. 3, the same code|symbol is attached|subjected to the part common to the said embodiment other than the packing 24. As shown in FIG.

In addition, with regard to the distance between the passage of the heat medium and the communication chamber and the bearing member 21 as described above, the length in the direction of the axis O of the other end portion 1B of the rotor 1 that transfers heat is the same as the length from the outer periphery of the other end portion 1B to the length along the convex line. The sum of the radial length of the edge portion 10 up to the bearing member 21, or the sum of the length of the extension portion 20 in the direction of the axis O and the radial length from the extension portion 20 to the bearing member 21 along the extension flange portion 20C is preferably 200 mm or more, more preferably 400 mm or more. If the distance is shorter than this, sufficient heat dissipation to the bearing member 21 may not be achieved due to the temperature of the heat medium and the heat dissipation effect of the heat dissipation portion.

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

Further, the other end portion 1B of the rotor 1 and the extension portion 20 of the casing 11 provided with such a heat dissipation portion may be air-cooled by blowing air from a fan or the like, or water-cooled in some cases to forcibly cool them. In addition, in this embodiment, the heat medium discharge flow path 5 and the supply flow path 6 are provided on the rotor 1, and the heat medium supply communication chamber 15 and the discharge communication chamber 16 are provided on the housing 11. A rotary joint supplies and discharges heat medium to the rotating body. However, only one of these flow paths and communication chambers may be provided, and only supply or discharge of the heat medium may be performed.

In addition, in this embodiment, the space inside the inner pipe 2 of the rotor 1 is connected to the heat medium discharge side of the rotating body to form the heat medium discharge flow path 5 , while the space between the rotor 1 and the inner pipe 2 It is connected to the heat medium supply side of the rotating body to form a heat medium supply flow path 6 . However, conversely, the space inside the inner tube 2 may be used as the heat medium supply flow path 6 and the space between the rotor 1 and the inner tube 2 may be used as the heat medium discharge flow path 5. The chambers can also be reversed configurations for supply and discharge.

Industrial availability

According to the present invention, it is possible to provide a rotary joint capable of preventing sintering and supporting a rotor stably and rotatably around an axis without complicating the structure and increasing the cost.

Label description

1: rotor; 1A: first end (one end) of rotor 1; 1B: second end (other end) of rotor 1; 2: inner tube; 4: mounting part; 5: discharge flow path; 6 : Supply flow path; 6A: Supply port; 8: Discharge chamber; 8A: Discharge port; 9: Radiation chamber (1st heat dissipation portion); 9A: Opening of heat dissipation chamber 9; 10: Flange portion (2nd heat dissipation portion ); 10A: opening of the flange portion 10; 11: housing; 12-14: first to third partition walls; 12A-14A: through-holes of the first to third partition walls 12-14; 15: supply Communication chamber; 15A: supply pipe; 16: discharge communication chamber; 16A: discharge pipe; 17, 24: seal; 18: gasket pressing member; 19: bush; 20: extension; 20C: extension flange; 21: bearing member; 22: fin (third heat dissipation portion); 23: opening of extension portion 20 (fourth heat dissipation portion); O: axis of rotor 1 .

Claims (5)

1. a kind of swivel joint, wherein,

The swivel joint has：Cylindric rotor, it is rotated about the axis；Housing, it is disposed in the periphery of the rotor；And axle Bearing portion part, it is installed between these rotors and housing and above-mentioned rotor is supported on into above-mentioned housing in a manner of rotating freely,

Above-mentioned rotor be internally formed the rotor above-mentioned axis direction the 1st end opening and heating medium circulation Stream, also, formed with the communication chamber with above-mentioned fluid communication between above-mentioned housing and above-mentioned rotor,

Above-mentioned parts of bearings is disposed in the 2nd end side of above-mentioned axis direction and relative in the outer radial periphery side of the axis Position of at least one party side away from above-mentioned stream and communication chamber, between above-mentioned stream and above-mentioned parts of bearings and above-mentioned connect At least one party between room and above-mentioned parts of bearings is provided with radiating part.

2. swivel joint according to claim 1, wherein,

In heat dissipation chamber's conduct of outside opening of the 2nd end side of above-mentioned rotor formed with completely cutting off with above-mentioned stream and to the rotor Above-mentioned radiating part.

3. swivel joint according to claim 1 or 2, wherein,

The flange part that the oriented outer radial periphery side relative to above-mentioned axis is stretched out is set in the 2nd end side of above-mentioned rotor as upper State radiating part.

4. the swivel joint described in any one in claims 1 to 3, wherein,

2nd end side of above-mentioned housing is provided with the periphery interval with above-mentioned rotor and is cylindrical in shape the extension of extension, The fin that the oriented outer radial periphery side relative to above-mentioned axis protrudes is set on the extension as above-mentioned radiating part.

5. the swivel joint described in any one in Claims 1-4, wherein,

2nd end side of above-mentioned housing is provided with the periphery interval with above-mentioned rotor and is cylindrical in shape the extension of extension, It is provided with the extension along the radial direction relative to above-mentioned axis and penetrates the opening portion of the extension as above-mentioned radiating part.