Pressure balance type rotary joint

Abstract

The utility model relates to the technical field of rotary joints, and discloses a pressure balance type rotary joint which comprises a shell and a rotating body arranged in the shell, the left end of the rotating body is located in the shell, the right end of the rotating body extends out of the shell, and a medium channel with the closed left end is arranged in the rotating body. A connecting channel perpendicular to the medium channel is formed in the side face of the shell, a plurality of flow guide holes communicated with the connecting channel are formed in the side face of the medium channel, a left end cover connected with the shell is arranged at the left end of the shell, an annular sealing body is arranged in the left end cover, and the annular sealing body and the left end of the rotating body are rotationally sealed. A closed balance cavity is formed between the annular sealing body and the left end of the rotating body, and the center of the left end of the rotating body is provided with a throttling channel used for communicating the balance cavity with the medium channel. The rotating body is pressed in a balanced mode, all sealing pieces are not prone to abrasion, the overall structure is more stable, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary joints, in particular to a pressure-balanced rotary joint. Background Art

[0002] A rotary joint is a connection and sealing device that transports fluid media from a stationary pipeline to a rotating or reciprocating device, thereby providing heating or cooling media for the rotating mechanism. For a direct rotary joint, its two ends form a right angle. When a high-pressure medium flows inside, the inner end of the rotating body is closed, and the medium flows out from the inner side wall of the rotating body. This causes the high-pressure medium to exert pressure on the inner end of the rotating body, resulting in an unbalanced pressure on the rotating body, which in turn affects the stability of use. The seal between the rotating body and the housing is easily worn due to uneven pressure. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides a pressure-balanced rotary joint with a rotating body that is stable under pressure and has a long overall service life.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A pressure-balanced rotary joint comprises a shell and a rotating body arranged in the shell, wherein the left end of the rotating body is located in the shell, and the right end of the rotating body extends out of the shell, a medium channel with a closed left end is arranged in the rotating body, a connecting channel vertically distributed with the medium channel is arranged on the side of the shell, a plurality of guide holes connected with the connecting channel are arranged on the side of the medium channel, a left end cover connected with the shell is arranged on the left end of the shell, an annular sealing body is arranged in the left end cover, a rotational seal is formed between the annular sealing body and the left end of the rotating body, a closed balancing chamber is formed between the annular sealing body and the left end of the rotating body, and a throttling channel for connecting the balancing chamber with the medium channel is arranged at the center of the left end of the rotating body.

[0006] A balancing chamber is constructed at the left end of the medium channel, and the medium in the medium channel enters the balancing chamber through the throttling channel, so that the left end face of the medium channel and the left end face of the rotating body are respectively subjected to medium pressures in opposite directions, thereby achieving pressure balance, making the rotation of the rotating body more stable, reducing the wear on the seal, and extending the overall service life.

[0007] Preferably, the inner wall of the shell is provided with supporting convex rings on both sides of the guide hole, the rotating body passes through the convex rings to form a clearance fit, the area between the two supporting convex rings forms an annular cavity, the guide hole is connected to the annular cavity, and the connecting channel is connected to the annular cavity.

[0008] Preferably, a first sealing ring is provided on the inner wall of the supporting convex ring, an annular groove is provided on the outer wall of the rotating body corresponding to the first sealing ring, and a convex ring matching the annular groove is provided at the inner hole of the first sealing ring.

[0009] Preferably, a limiting convex ring is provided on the outer side of the left end of the rotating body, a thrust bearing is provided between the limiting convex ring and the supporting convex ring on the left side, a ball bearing is provided on the right side surface of the supporting convex ring on the right side of the rotating body, a right end cover is provided on the right end of the shell, and the rotating body extends out of the shell through the right end cover.

[0010] Preferably, a second sealing ring is provided between the outer side surface of the limiting convex ring and the interior of the shell, and a third sealing ring is provided between the right end cover and the outer wall of the rotating body.

[0011] Preferably, the third sealing rings are configured in two groups, and an elastic gasket is provided between the two groups of third sealing rings.

[0012] Preferably, the left end face of the medium channel is configured as a conical surface, the left end face of the rotating body is configured as a spherical surface convex to the left, the right end face of the annular sealing body is abutted and sealed with the spherical surface, and the cross-sectional area of ​​the balancing chamber is equal to the cross-sectional area of ​​the medium channel.

[0013] Therefore, in the utility model, the rotating body is under balanced pressure, each sealing element is not easy to wear, the overall structure is more stable, and the service life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 for Figure 1 sectional view of .

[0016] Figure 3 A cross-sectional view of the shell.

[0017] Figure 4 It is a schematic diagram of the coordination between the rotating body and the annular sealing body.

[0018] In the figure: housing 10, connecting channel 11, supporting convex ring 12, annular cavity 120, first sealing ring 13, convex ring 130, rotating body 20, medium channel 200, guide hole 201, conical surface 202, spherical surface 203, annular groove 204, throttling channel 21, limiting convex ring 22, second sealing ring 220, thrust bearing 23, ball bearing 24, left end cover 30, right end cover 40, third sealing ring 41, elastic gasket 42, annular sealing body 50, balancing cavity 500. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0020] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0021] like Figure 1-Figure 4 A pressure-balanced rotary joint is shown, comprising a shell 10, a rotating body 20 arranged in the shell 10, the left end of the rotating body 20 is located in the shell, the left end of the shell 10 is provided with a left end cover 30, the right end of the shell is provided with a right end cover 40, the right end of the rotating body 20 passes through the right end cover and extends out of the shell, a medium channel 200 with a closed left end is provided in the rotating body 20, a connecting channel 11 vertically distributed with the medium channel is provided on the side of the shell 10, and a plurality of guide holes 201 connected with the connecting channel are provided on the side of the medium channel 200.

[0022] An annular sealing body 50 is provided in the left end cover 30, and a rotational seal is formed between the annular sealing body 50 and the left end of the rotating body 20. A closed balancing chamber 500 is formed between the annular sealing body 50 and the left end of the rotating body. A throttling channel 21 for connecting the balancing chamber with the medium channel is provided at the center of the left end of the rotating body 20.

[0023] In some embodiments, the left end face of the medium channel 200 is configured as a conical surface 202, the left end face of the rotating body 20 is configured as a spherical surface 203 protruding to the left, the right end face of the annular sealing body 50 is sealed against the spherical surface, and the cross-sectional area of ​​the balancing chamber is equal to the cross-sectional area of ​​the medium channel. The annular sealing body adopts an annular end face sealing ring, the left end face of which is closed, and the right end face is sealed against the spherical surface 203, and the sealing effect is good. The high-pressure medium in the medium channel enters the balancing chamber through the throttling hole, and the medium in the balancing chamber generates a rightward pressure Fa on the spherical surface 203 at the left end of the rotating body, and the medium in the medium channel generates a leftward pressure Fb on the conical surface 202 at the left end of the medium channel. Since the cross-section of the balancing chamber and the cross-section of the medium channel are equal, the medium pressure in the balancing chamber is equal to the medium pressure in the medium channel, so that Fa=Fb; In some embodiments, the aperture of the throttling channel is set to 1-3 mm. When the medium pressure in the medium channel changes, the medium pressure in the balance chamber can be changed softly (with a lag) through the throttling channel with a small aperture, thereby preventing the pressure in the balance chamber from changing too much and causing the seal to fail, thereby enabling the rotating body to achieve a dynamic pressure balance; and the spherical surface 203 and the conical surface 202 can also reduce the axial runout generated when the rotating body rotates. The medium pressure on the spherical surface 203 and the conical surface 202 can drive the rotating body to rotate coaxially, further reducing the wear on the seal.

[0024] The inner wall of the housing 10 is provided with supporting protruding rings 12 on both sides of the flow guide hole, and the rotating body 20 passes through the protruding rings to form a clearance fit, and the area between the two supporting protruding rings forms an annular cavity 120, the flow guide hole 201 is connected to the annular cavity 120, and the connecting channel 11 is connected to the annular cavity 120. The inner wall of the supporting protruding ring 12 is provided with a first sealing ring 13, and the outer wall of the rotating body 20 and the corresponding part of the first sealing ring are provided with an annular groove 204, and the inner hole of the first sealing ring 13 is provided with a protruding ring 130 adapted to the annular groove.

[0025] A limiting convex ring 22 is provided on the outer side of the left end of the rotating body 20, a thrust bearing 23 is provided between the limiting convex ring 22 and the supporting convex ring 12 on the left side, and a ball bearing 24 is provided on the right side surface of the supporting convex ring on the right side of the rotating body 20; a second sealing ring 220 is provided between the outer side surface of the limiting convex ring 22 and the interior of the shell, a third sealing ring 41 is provided between the right end cover 40 and the outer wall of the rotating body, and the third sealing ring 41 is configured into two groups, and an elastic gasket 42 is provided between the two groups of third sealing rings.

[0026] The rotating body and the shell are sealed by multi-stage sealing rings. The left end of the medium channel in the rotating force and the right end of the balance chamber are subject to the same medium pressure, and the pressure is adaptively adjusted through the throttling channel, so that the axis maintains dynamic pressure balance during the rotation of the rotating body, the rotation is more stable and smooth, the axial runout is smaller, the sealing ring is not easy to wear, and the overall service life is increased.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0028] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A pressure-balanced rotary joint, comprising a housing, a rotating body arranged in the housing, wherein the left end of the rotating body is located in the housing, and the right end of the rotating body extends out of the housing, a medium channel with a closed left end is arranged in the rotating body, a connecting channel vertically distributed with the medium channel is arranged in the side of the housing, and a plurality of guide holes communicating with the connecting channel are arranged on the side of the medium channel, wherein the characteristics are: The left end of the shell is provided with a left end cover connected to the shell, and an annular sealing body is provided inside the left end cover. A rotational seal is formed between the annular sealing body and the left end of the rotating body, and a closed balancing chamber is formed between the annular sealing body and the left end of the rotating body. A throttling channel for connecting the balancing chamber and the medium channel is provided at the center of the left end of the rotating body.

2. A pressure-balanced rotary joint according to claim 1, characterized in that: The inner wall of the shell is provided with supporting convex rings on both sides of the guide hole, the rotating body passes through the convex rings to form a clearance fit, the area between the two supporting convex rings forms an annular cavity, the guide hole is connected to the annular cavity, and the connecting channel is connected to the annular cavity.

3. A pressure-balanced rotary joint according to claim 2, characterized in that: A first sealing ring is provided at the inner wall of the supporting convex ring, an annular groove is provided at the outer wall of the rotating body corresponding to the first sealing ring, and a convex ring matched with the annular groove is provided at the inner hole of the first sealing ring.

4. A pressure balanced rotary joint according to claim 2 or 3, characterized in that: A limiting convex ring is provided on the outer side of the left end of the rotating body, a thrust bearing is provided between the limiting convex ring and the supporting convex ring on the left side, a ball bearing is provided on the right side surface of the supporting convex ring on the right side of the rotating body, a right end cover is provided on the right end of the shell, and the rotating body extends out of the shell through the right end cover.

5. A pressure-balanced rotary joint according to claim 4, characterized in that: A second sealing ring is provided between the outer side surface of the limiting convex ring and the interior of the shell, and a third sealing ring is provided between the right end cover and the outer wall of the rotating body.

6. A pressure-balanced rotary joint according to claim 5, characterized in that: The third sealing rings are configured into two groups, and an elastic gasket is provided between the two groups of third sealing rings.

7. A pressure-balanced rotary joint according to claim 1, characterized in that: The left end face of the medium channel is configured as a conical surface, the left end face of the rotating body is configured as a spherical surface convex to the left, the right end face of the annular sealing body abuts and seals the spherical surface, and the cross-sectional area of ​​the balancing cavity is equal to the cross-sectional area of ​​the medium channel.

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