Rotary joint manufacturing method
The utility model relates to a rotary connection device for transmitting oil, water, steam, glue and other media, and particularly relates to a Rotary joint.
Background technique:
With the development of the society and the progress of the times, the development of industry is becoming faster and faster. For example, the equipment required for industries such as papermaking, printing and dyeing, steel, petrochemical and other industries are constantly being updated and optimized. At present, many devices need to use rotary joints to transfer oil, water, steam, glue and other media, such as transferring oil, water, or steam to a rotating mechanism (such as a drying cylinder) for heat exchange (heating or cooling), or transferring glue to the rotating mechanism. (Such as rubber mixing cylinder) for the rubber mixing, the existing rotary joints are generally only sealed with a flat ceramic ring, the flat ceramic ring can not swing, easy to leak after a swing, poor sealing effect, and easily affected by thermal expansion and contraction, use Short life.
Technical realization elements:
In view of the shortcomings of the prior art, the technical problem to be solved by the present utility model is to provide a rotary joint with novel structural design, low manufacturing cost, good sealing effect and long service life.
In order to solve the above technical problems, the technical solution adopted by the present utility model is: a rotary joint including a housing, a hollow shaft, and an end cover, one end of the hollow shaft is installed in the housing through a first bearing, and the hollow shaft The other end of the hollow shaft is penetrated outside the end cover through a second bearing, the end cover is locked and fixed to the housing, and a first collar and a second collar are provided on the outer periphery of the hollow shaft. The outer end surface of the bearing bears against the inner end surface of the first collar. The outer end surface of the second collar is concentrically provided with an annular inlay groove surrounding the outer periphery of the hollow shaft. The other end of the hollow shaft is sleeved with elasticity. An annular sealing sleeve, a ceramic sealing movable ring and a spherical sealing ring, the elastic annular sealing sleeve covers the inner end surface and the peripheral side of the ceramic sealing movable ring and is embedded in an annular inlaid groove, and the outer end surface of the ceramic sealing movable ring It is in plane sealing contact with the inner end of the spherical seal ring. The inner end of the end cap is provided with a seal ring ring seat hole. The inner end spherical surface of the seal ring ring hole and the outer surface of the spherical seal ring ring are sealed and matched. .
Further, a first bearing housing hole is provided inside the housing, the first bearing is fixedly installed in the first bearing housing hole in the circumferential direction, and the first bearing housing hole is installed to bear against the first bearing. A compression spring at an end surface, and an inner end surface of the first bearing seat hole is provided with a circular positioning groove for positioning one end of the compression spring.
Further, the first bearing is an oil-free bearing, a first key groove is provided on a peripheral side surface of the first bearing, and an inner wall of the first bearing seat hole is provided with a second key groove corresponding to the first key groove. An anti-rotation key that prevents the first bearing from rotating is embedded between the first key groove and the second key groove. An inner end surface of the first bearing is provided with an annular positioning groove for positioning the other end of the compression spring.
Further, a second bearing seat hole is provided at an outer end portion of the end cover, and the second bearing is fixedly installed in the second bearing seat hole circumferentially.
Further, the second bearing is an oil-free bearing, and a plurality of third key grooves are evenly distributed at the edge of the outer end surface of the second bearing, and a plurality of corresponding key grooves are provided on the outer end surface of the end cover. The fourth keyway is provided with a thin key for preventing the second bearing from rotating in the third keyway and the fourth keyway. One end of the thin key is fixed in the fourth keyway of the end cover by screws. The other end of the thin key is pressed tightly into the third key groove of the second bearing.
Further, two symmetrically distributed bayonet pins are fixed on the circumferential side of the spherical seal retainer ring, and two bayonet grooves corresponding to the bayonet pins are provided at the opening of the seal retainer ring seat hole. Inside the groove to prevent the spherical sealing ring from rotating axially.
Further, the inner spherical surface of the sealing ring seat hole and the outer spherical surface of the spherical ring seat ring are soft-sealed. One is provided with an annular groove concentrically, and an elastic sealing ring is embedded in the annular groove. Or, the inner spherical surface of the sealing ring seat hole is rigidly matched with the outer spherical surface of the spherical ring.
Further, one end of the housing is provided with a medium inlet hole communicating with the inner cavity thereof, the medium inlet hole is arranged concentrically with the hollow shaft, the medium inlet hole is used for sealing and connecting the inner pipe, and the other end of the housing An opening is provided to facilitate the installation of parts. The side wall of the casing is provided with a medium outlet hole communicating with its inner cavity. The middle side wall of the hollow shaft is provided with a space between the first collar and the second collar. A return hole, which is in communication with the inner cavity of the housing.
Further, one end of the housing is provided with a first externally threaded joint for connecting an input pipe, the medium inlet is located at the center of the first externally threaded joint, and an inner side wall of the medium inlet is provided for connecting the inner A first internal thread at one end of the tube, a second internal thread for connecting an output pipe is provided on an inner side wall of the medium outlet, and a second external thread joint for connecting a rotating mechanism is provided at the other end of the hollow shaft.
Further, the outer side wall of the casing is provided with a fixing ear portion for facilitating the fixing of the casing, and the fixing ear portion is provided with a fixing hole.
Compared with the prior art, the utility model has the following beneficial effects: (1) an annular inlay groove is provided on the second collar, and the inner end surface and the peripheral side surface of the ceramic seal moving ring are covered with an elastic annular sealing sleeve, and the The elastic annular sealing sleeve and the ceramic sealing moving ring are embedded in the annular inlay groove, which can seal the ceramic sealing moving ring, prevent the medium from entering the center hole of the ceramic sealing moving ring, and can effectively protect the ceramic sealing moving ring from thermal expansion. Damage caused by cold shrinkage; (2) The convex spherical surface of the spherical sealing ring and the concave spherical surface of the end cap are used to soften the seal, which not only reduces the accuracy of the fit, thereby reducing the manufacturing cost, but also improves the sealing effect. The small sealing ring can also reliably seal to prevent leakage of the medium; (3) The overall design of the rotary joint is clever, the structure is novel, the manufacturing cost is low, the work is reliable, the service life is long, and it has a good market prospect.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front half longitudinal sectional view of an embodiment of the present invention.
FIG. 2 is a right side view of an embodiment of the present invention.
FIG. 3 is a bottom view of the embodiment of the utility model.
FIG. 4 is a schematic view of using the embodiment of the present invention.
Reference numerals: 1. housing; 2. end cap; 3. hollow shaft; 4. first bearing; 5. thin key; 6. second bearing; 7. anti-rotation key; 8. compression spring; 9. ceramic Sealing moving ring; 10, elastic annular sealing sleeve; 11, spherical sealing ring; 12, bayonet; 13, card groove; 14, elastic sealing ring; 15, annular groove; 16, medium inlet; 17, medium outlet Holes; 18, sealing ring seat holes; 19, fixing holes; 20, first bearing seat holes; 21, circular positioning grooves; 22, first key grooves; 23, second key grooves; 24, annular positioning grooves; Second bearing seat hole; 26, third keyway; 27, fourth keyway; 28, first external threaded joint; 29, second external threaded joint; 30, fixed ear; 31, first collar; 32, first Two collars; 33, annular mosaic groove; 34, return hole; 40, inner tube.
Detailed ways
In order to make the above features and advantages of the present invention more comprehensible, embodiments are described below in detail with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, a rotary joint includes a housing 1, a hollow shaft 3, and an end cover 2. One end of the hollow shaft 3 is installed in the housing 1 through a first bearing 4. The hollow shaft The other end of 3 is threaded out of the end cover 2 through a second bearing 6. The end cover 2 can be fastened and fixed to the housing 1 by bolts. A central collar 31 is provided on the outer periphery of the hollow shaft 3. And the second collar 32, the outer end surface of the first bearing 4 abuts on the inner end surface of the first collar 31, and the outer end surface of the second collar 32 is concentrically provided with a ring shape that surrounds the outer periphery of the hollow shaft 3. Inlaid groove 33, the other end of the hollow shaft 3 is sleeved with an elastic annular seal sleeve 10, a ceramic seal movable ring 9 and a spherical seal fixing ring 11, the elastic annular seal sleeve 10 covers the ceramic seal movable ring 9 The inner end surface and the peripheral side surface are embedded in the annular inlay groove 33. The outer end surface of the ceramic seal moving ring 9 is in plane contact with the inner end of the spherical seal ring 11. The inner end of the end cap 2 is provided with a seal ring. The ring seat hole 18 has an inner spherical surface sealingly fitted with an outer end spherical surface of the spherical sealing ring 11.
Wherein, the housing 1 may be made of castings, and the material thereof may be ball-milled cast iron; the material of the end cap 2 may be HT200; the material of the hollow shaft 3 may be 45 steel; the elastic annular sealing sleeve 10 is preferably But it is not limited to rubber ring sleeves. For example, when the medium is water, nitrile rubber is used. When the medium is oil, high temperature resistant fluorine rubber is used. When the medium is steam, it is made of silicone. The elastic annular sealing sleeve 10 covered on the ceramic sealing movable ring 9 can be fixedly embedded in the annular inlay groove 33, that is, the outer periphery of the ceramic sealing movable ring 9 and the elastic annular sealing sleeve 10 interference fit, and the outer periphery of the elastic annular sealing sleeve 10 Interference fit with the annular inlay groove 33; the ceramic seal moving ring 9 is preferably, but not limited to, a silicon carbide ceramic seal ring, and may also be a silicon nitride ceramic seal ring, etc., which has excellent mechanical properties such as high temperature resistance and high pressure resistance; The spherical sealing ring 11 is preferably, but not limited to, a graphite spherical sealing ring. Of course, a high temperature resistant antimony-impregnated graphite spherical sealing ring or a spherical sealing ring of other materials can also be used.
In this embodiment, a first bearing housing hole 20 is provided inside the housing 1, and the first bearing 4 is fixedly installed in the first bearing housing hole 20 in the circumferential direction, and the first bearing housing hole 20 A compression spring 8 is installed to bear against the inner end surface of the first bearing 4. The compression spring 8 may be made of carbon spring steel wire. The inner end surface of the first bearing seat hole 20 is provided for positioning one end of the compression spring 8.圆 位置 槽 21。 The circular positioning groove 21. Wherein, the first bearing 4 is an oil-free bearing, such as a graphite bearing, and it is not necessary to add a lubricant. A peripheral surface of the first bearing 4 is provided with a first key groove 22, and an inner wall of the first bearing housing hole 20 is provided. A second keyway 23 corresponding to the first keyway 22 is provided with an anti-rotation key 7 (such as a round flat key) that prevents the first bearing 4 from rotating between the first keyway 22 and the second keyway 23. An inner end surface of a bearing 4 is provided with an annular positioning groove 24 for positioning the other end of the compression spring 8.
In this embodiment, a second bearing housing hole 25 is provided at an outer end portion of the end cover 2, and the second bearing 6 is fixedly mounted in the second bearing housing hole 25 in a circumferential direction. The second bearing 6 is an oil-free bearing, such as a graphite bearing, and does not need to be added with a lubricant. Two symmetrically-distributed third key grooves 26 are provided at the outer end edge of the second bearing 6, and the end cap 2 An outer end surface of the second key groove 26 is provided with two fourth key grooves 27 corresponding to the third key groove 26, and the third key groove 26 and the fourth key groove 27 are jointly installed with a thin key 5 for preventing the second bearing 6 from rotating. One end of the thin key 5 is fixed in the fourth key groove 27 of the end cover 2 by screws, and the other end of the thin key 5 is tightly pressed in the third key groove 26 of the second bearing 6.
In this embodiment, in order to prevent the spherical sealing ring 11 from rotating, two symmetrically distributed latches 12 are fixed on the peripheral side of the spherical sealing ring 11, and two openings of the sealing ring seat hole 18 are provided at the opening. A locking groove 13 corresponding to the locking pin 12 is inserted into the locking groove 13 so that the spherical sealing ring 11 does not follow the ceramic sealing moving ring 9 but can swing slightly. During the swinging process, due to the spherical fit Keep it sealed at all times. The cross-section of the clamping groove 13 may be semi-circular, and the clamping pin 12 is preferably, but not limited to, a stainless steel pin. The specific material may be 304 stainless steel.
In this embodiment, the inner spherical surface of the sealing ring retainer hole 18 and the outer spherical surface of the spherical ring retaining ring 11 are soft-sealed; of course, the inner spherical surface of the sealing ring seat hole 18 can also be matched with The outer end of the spherical sealing ring 11 is rigidly sealed and matched. At this time, the accuracy of the two spherical surfaces is very high. In order to achieve a soft seal between the spherical sealing ring 11 and the end cap 2, an annular groove 15 is concentrically provided on the inner spherical surface of the sealing ring seat hole 18, and the annular groove 15 is embedded with a spherical surface. The elastic sealing ring 14 in which the outer end of the sealing ring 11 contacts the spherical surface; of course, in another embodiment, an annular groove can also be opened on the outer spherical surface of the ceramic seal moving ring 9, that is, the elastic sealing ring is installed on the ceramic The spherical surface of the outer end of the seal moving ring 9. The elastic seal ring 14 may be an O-type rubber seal ring or the like.
In this embodiment, one end of the housing 1 is provided with a medium inlet 16 communicating with the inner cavity thereof. The medium inlet 16 is disposed concentrically with the hollow shaft 3, and the medium inlet 16 is used for sealingly connecting the inner tube. The other end of the housing 1 is provided with an opening for installing components. The side wall of the housing 1 is provided with a medium outlet hole 17 communicating with its internal cavity. The central side wall of the hollow shaft 3 is provided with A return hole 34 between the first collar 31 and the second collar 32 is communicated with the inner cavity of the housing 1.
In this embodiment, in order to facilitate connection, one end of the housing 1 is provided with a first externally threaded joint 28 for connecting an input pipe, and the medium inlet 16 is located at the center of the first externally threaded joint 28. The inner side wall of the medium inlet hole 16 is provided with a first internal thread for connecting one end of the inner pipe, the inner side wall of the medium outlet hole 17 is provided with a second internal thread for connecting an output pipe, and the other end of the hollow shaft 3 (Ie, the outer end portion) is provided with a second externally threaded joint 29 for connecting the rotation mechanism to be threadedly connected with the rotation mechanism on the mechanical equipment, and the other end portion of the hollow shaft 3 may also be provided with two symmetrically distributed flat For easy installation.
In this embodiment, the outer side wall of the casing 1 is provided with a fixing ear 30 for facilitating the fixing of the casing 1, and the fixing ear 30 is provided with a fixing hole 19 (specifically, a fixing through hole). The fixing ear portion 30 may also be provided with a threaded hole to facilitate fixing in another manner.
Please refer to FIG. 4. During installation, insert one end of the outer tube 40 into the hollow shaft 3 and lock the outer thread of the end with the inner thread of the medium inlet 16. The other end of the inner tube 40 leads to the outer tube. In the rotating mechanism (omitted from the figure), the second externally threaded joint 29 of the hollow shaft 3 is sealedly connected with the rotating mechanism of the mechanical equipment, and the housing 1 is fixed on the frame of the mechanical equipment through the fixing hole 19, and the elbow The first externally threaded joint 28 of the housing 1 is connected to an external input pipe, and the externally connected output pipe is tightly and tightly connected to the internal thread of the medium outlet 17; in use: the medium enters from the medium inlet 16 of the housing 1 The tube 40 and the inner tube 40 feed the medium into the rotating mechanism, and the medium returns to the center hole of the hollow shaft 3 after heat exchange in the rotating mechanism. The returned medium enters the inner cavity of the housing 1 from the return hole of the hollow shaft 3, Finally, it flows out from the medium outlet 17.
The above are only the preferred embodiments of the present utility model, and do not limit the utility model in any form. Any person skilled in the art who has not deviated from the content of the technical solution of the utility model according to the technology of the utility model In essence, any simple modification, equal change, and modification made to the above embodiments should fall within the scope of the present invention.