Multi-channel rotating joint with balanced mechanical sealing structure

Abstract

The invention relates to a multi-channel rotary joint with a balanced mechanical sealing structure, which is applied to the technical field of rotary joints and comprises a rotary shaft, a shell, an annular groove, a sealing ring, a channel outlet, an assembling end, a telescopic cylinder, an introduction sheet and a pressure monitoring module. Through the arrangement of the annular groove, a circulating medium can do circular motion in the annular groove, the purpose that the rushing-out pressure of the circulating medium is converted into rotating kinetic energy is achieved, and therefore the sealing pressure of the sealing ring is reduced, the leading-in piece stretches into the annular groove, and the circulating medium rapidly enters the assembling and connecting end by utilizing the leading-in piece to face the circulating medium discharged out of the channel outlet. Therefore, the staying time of a circulating medium in the annular groove is effectively shortened, the leakage risk of the rotary joint is reduced, the stress condition of the leading-in piece is monitored through the pressure monitoring module, and the condition that the circulating medium enters the assembling end is reflected through the change of pressure data.

Description

Technical Field

[0001] The present invention relates to a multi-channel rotary joint, and more particularly to a multi-channel rotary joint with a balanced mechanical seal structure applied in the field of rotary joint technology. Background Technology

[0002] Adapters, also known as rotary joints or slip rings, are classified by application into hydraulic and pneumatic types, and by the number of passages into single-pass and multi-pass types. They are mainly used in pipelines that transport fluid media and are installed on the rotating parts of the main equipment, allowing the rigid pipeline fixed to the main equipment to rotate relative to each other and withstand a certain fluid pressure. The rotary joint achieves sealing through its internal sealing device.

[0003] Chinese patent CN218719579U discloses a "Multi-channel Rotary Joint," which connects multiple non-uniformly distributed second through holes with multiple uniformly distributed first through holes to increase space utilization, resulting in a smaller volume and a smaller rotating shaft diameter. This optimized structure connects external circulating coolant to a circulation loop on the housing. A temperature sensor monitors the housing temperature; when the temperature is too high, external circulating coolant enters the housing to cool the housing and rotating shaft, thus extending service life. Chinese patent CN104279385B discloses a "High-Sealing Rotary Joint," where the sealing lip automatically compensates for wear, resulting in a long service life. As wear increases, the sealing surface gradually enlarges, further strengthening the seal. When the wear of the sealing lip reaches the failure threshold, a warning light illuminates, prompting replacement.

[0004] The outlet of the shaft assembly of the existing rotary joint is connected to the annular cavity of the cylindrical assembly. The sealing ring structure is located at both ends of the annular cavity. When the flowing medium enters the annular cavity from the outlet, the impact force of the flowing medium can easily directly affect the sealing rings at both ends of the annular cavity. The sealing pressure of the sealing rings is relatively large. Subsequently, the flowing medium is dispersed to the left and right directions of the annular cavity. Therefore, the flow of the flowing medium in the annular cavity is chaotic. The flowing medium cannot be discharged from the outlet on the annular cavity quickly, which prolongs the residence time of the flowing medium in the annular cavity and further increases the sealing pressure of the sealing rings. Summary of the Invention

[0005] The technical problem to be solved by the present invention in view of the above-mentioned prior art is that when the flowing medium enters the annular cavity from the outlet, the impact force of the flowing medium can easily directly affect the sealing rings at both ends of the annular cavity, resulting in a large sealing pressure on the sealing rings and affecting the use of the sealing structure.

[0006] To solve the above problems, the present invention provides a multi-channel rotary joint with a balanced mechanical seal structure, including a rotating shaft and a housing that are rotatably connected to each other. An input channel is provided inside the rotating shaft, and an annular groove is provided on the inner surface of the housing. Sealing rings are fitted between the upper and lower ends of the annular groove and the rotating shaft. The inner end of the input channel is parallel to and corresponds to the annular groove, and a channel outlet is provided at the inner end of the input channel corresponding to the annular groove. A connection hole is provided outside the annular groove. The channel outlet is tangent to the cross section of the rotating shaft. An assembly end is inserted into the outside of the connection hole. A telescopic cylinder is movably connected inside the assembly end. An inlet plate is fixedly connected to one end of the telescopic cylinder. The inlet plate extends into the annular groove and faces the channel outlet. A pressure monitoring module is fixedly connected to the inner wall of the assembly end. The back of the inlet plate is slidably connected to the monitoring end of the pressure monitoring module.

[0007] In the aforementioned multi-channel rotary joint with a balanced mechanical seal structure, by setting the channel outlet to be tangent to the cross-section of the rotating shaft, the flowing medium can make circular motion within the annular groove, thereby converting the outflow pressure of the flowing medium into rotational kinetic energy, thus reducing the sealing pressure of the sealing ring.

[0008] As a further improvement of this application, a cylindrical ring is fixedly connected to the other end of the telescopic cylinder, and a retraction spring is sleeved between the cylindrical ring and the middle of the inner wall of the assembly end. The elastic force of the retraction spring is used to push the cylindrical ring, so that the telescopic cylinder drives the guide plate to retract to the assembly end.

[0009] As a further improvement of this application, an electric screw shaft is rotatably connected to the end of the assembly end away from the connection hole, and the cylinder ring is threadedly connected to the electric screw shaft. The automatic telescopic movement of the telescopic cylinder is realized by utilizing the threaded connection between the electric screw shaft and the cylinder ring.

[0010] As a further improvement of this application, a flow sensor is fixedly connected to the output end of the connector. The output end of the flow sensor and the output end of the pressure monitoring module are connected to a leakage alarm module. The flow sensor detects the flowing medium discharged through the connector and, together with the pressure monitoring module, monitors the pressure of the inlet plate to accurately determine whether there is a leak in the connector and issues an alarm through the leakage alarm module.

[0011] As another improvement of this application, the surface of the rotating shaft is provided with a plug-in groove, which corresponds horizontally to the channel outlet. An outlet module is plugged into the inside of the plug-in groove, with one end of the outlet module extending into the channel outlet. This facilitates the installation and fixing of the outlet module to the corresponding channel outlet, and allows for the separate handling of the discharge of the circulating medium in the channel outlet.

[0012] As a further improvement to this application, a closed tongue is fixedly connected to one end of the outlet module that extends into the channel outlet. The closed tongue contacts and corresponds to the inner wall of the channel outlet, and the closed tongue is made of elastic rubber material. The closed tongue is used to control the flow space of the channel outlet, thereby controlling the flow rate of the circulating medium into the annular groove, thereby relieving the sealing pressure of the sealing ring in the annular groove.

[0013] As a further improvement to this application, the internal fixed connection of the closed-mouth tongue pack is a support spring. The support spring is curved in an arc shape and is made of elastic stainless steel. The support spring effectively improves the elasticity of the closed-mouth tongue pack.

[0014] As another improvement of this application, a movable chamber is fixedly connected to the middle of the outlet module. The movable chamber corresponds to the axis of the rotating shaft, and a magnetic ball is placed inside the movable chamber. A tension wire is threaded through the middle of the magnetic ball, and one end of the support spring is fixedly connected to the tension wire. By utilizing the influence of the magnetic ball in the movable chamber on the tension wire, the support spring is deformed, thereby controlling the size of the closed tongue and thus controlling the medium flow capacity of the channel outlet.

[0015] As another improvement of this application, an electromagnetic column module is fixedly connected to the middle of the telescopic cylinder, and the magnetic ball is horizontally aligned with the electromagnetic column module. The position of the magnetic ball in the active chamber is changed by the magnetic force of the electromagnetic column module on the magnetic ball.

[0016] In summary, this invention sets the channel outlet to be tangent to the cross-section of the rotating shaft, allowing the flowing medium to move in a circular motion within the annular groove. This converts the outflow pressure of the flowing medium into rotational kinetic energy, thereby reducing the sealing pressure on the sealing ring. Furthermore, the extension and retraction of the telescopic cylinder within the assembly end controls the extent to which the inlet plate extends into the annular groove. By using the inlet plate to meet the flowing medium discharged from the channel outlet, the flowing medium can quickly enter the assembly end, effectively reducing the residence time of the flowing medium within the annular groove and thus reducing the leakage risk of the rotary joint. Attached Figure Description

[0017] Figure 1 This is a three-dimensional cross-sectional view of the first embodiment of this application; Figure 2 This is a perspective structural diagram of the first embodiment of this application; Figure 3 This is a perspective structural diagram of the rotating shaft according to the first embodiment of this application; Figure 4 This is a top cross-sectional perspective view of the first embodiment of this application; Figure 5 This is a diagram illustrating the rotating flow state of the medium according to the first embodiment of this application; Figure 6This is a cross-sectional perspective view of the assembly end of the first embodiment of this application; Figure 7 This is a perspective view of the insertion groove and outlet module according to the second embodiment of this application; Figure 8 This is a perspective structural diagram of the export module according to the second embodiment of this application; Figure 9 This is a demonstration diagram illustrating how the magnetic ball, through a tension wire, pulls the support spring to deform according to the second embodiment of this application. Figure 10 This is a three-dimensional structural diagram of the magnetic ball and tension wire according to the second embodiment of this application.

[0018] Explanation of the labels in the diagram: 101. Rotating shaft; 102. Housing; 103. Input channel; 104. Annular groove; 105. Sealing ring; 106. Channel outlet; 107. Connecting hole; 2. Assembly end; 201. Telescopic cylinder; 202. Inlet plate; 203. Pressure monitoring module; 204. Cylindrical ring; 205. Retracting spring; 206. Electric screw shaft; 3. Insertion groove; 301. Outlet module; 302. Closed tongue; 303. Support spring; 304. Movable chamber; 305. Magnetic ball; 306. Tension wire; 307. Electromagnetic column module. Detailed Implementation

[0019] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0020] First implementation method: Figures 1 to 5 The diagram shows a multi-channel rotary joint with a balanced mechanical seal structure, comprising a rotating shaft 101 and a housing 102 rotatably connected to each other. An input channel 103 is formed inside the rotating shaft 101, and an annular groove 104 is formed on the inner surface of the housing 102. Sealing rings 105 are fitted between the upper and lower ends of the annular groove 104 and the rotating shaft 101. The inner end of the input channel 103 is parallel to and corresponds to the annular groove 104, and an outlet 106 is formed at the inner end of the input channel 103 corresponding to the annular groove 104. The outer surface of the annular groove 104... The section has a connecting hole 107 and a channel outlet 106 that are tangent to the cross section of the rotating shaft 101. A connecting end 2 is inserted into the outside of the connecting hole 107. A telescopic cylinder 201 is movably connected inside the connecting end 2. An inlet piece 202 is fixedly connected to one end of the telescopic cylinder 201. The inlet piece 202 extends into the annular groove 104 and faces the channel outlet 106. A pressure monitoring module 203 is fixedly connected to the inner wall of the connecting end 2. The back of the inlet piece 202 is slidably connected to the monitoring end of the pressure monitoring module 203. Because the cross-section of the channel outlet 106 is tangent to the rotating shaft 101, the flowing medium can make circular motion within the annular groove 104, thus converting the outflow pressure of the flowing medium into rotational kinetic energy. Compared with the traditional rotary joint that fills the annular groove 104 in a straight line, this effectively reduces the impact force of the flowing medium on the flowing medium, thereby reducing the sealing pressure of the sealing ring 105. Furthermore, by controlling the extension and retraction of the telescopic cylinder 201 within the assembly end 2, the extent to which the inlet plate 202 extends into the annular groove 104 is controlled. The inlet plate 202 is directed towards the flowing medium discharged from the channel outlet 106. Specifically, the inlet plate 202 rotates towards the channel outlet 106, enabling the flowing medium to quickly enter the assembly end 2, thereby effectively reducing the residence time of the flowing medium within the annular groove 104 and reducing the leakage risk of the rotary joint. When the inlet plate 202 guides the flow of the flowing medium, the pressure on the inlet plate 202 due to the impact of the flowing medium is monitored by the pressure monitoring module 203, thereby using the changes in pressure data to reflect the entry of the flowing medium into the assembly end 2.

[0021] Figures 1 to 6 As shown, a cylindrical ring 204 is fixedly connected to the other end of the telescopic cylinder 201. A retraction spring 205 is sleeved between the cylindrical ring 204 and the middle of the inner wall of the assembly end 2. The elastic force of the retraction spring 205 pushes the cylindrical ring 204, so that the telescopic cylinder 201 drives the inlet plate 202 to retract into the assembly end 2. An electric screw 206 is rotatably connected to the end of the assembly end 2 away from the connection hole 107. The cylindrical ring 204 is threadedly connected to the electric screw 206. The automatic telescopic movement of the telescopic cylinder 201 is realized by the threaded connection between the electric screw 206 and the cylindrical ring 204. A flow sensor is fixedly connected to the output end of the assembly end 2. The output end of the flow sensor and the output end of the pressure monitoring module 203 are connected to a leakage alarm module. The flow sensor detects the flowing medium discharged through the assembly end 2, and the pressure monitoring module 203 monitors the pressure of the inlet plate 202, so as to accurately determine whether there is a leak in the assembly end 2, and the leakage alarm module will issue an alarm. By utilizing the threaded connection between the electric screw shaft 206 and the cylindrical ring 204, the electric screw shaft 206 drives the telescopic cylinder 201 to automatically extend and retract, thereby controlling the extent to which the guide plate 202 extends into the annular groove 104. This adjusts the guide plate 202's guidance of the flow medium into the assembly end 2. The extension position of the guide plate 202 corresponds to the rotation direction of the rotating shaft 101 and the housing 102. (Refer to the attached diagram.) Figure 5When the rotating shaft 101 rotates clockwise, the inlet plate 202 rotates towards the channel outlet 106 and extends into the annular groove 104 to guide the flow of the medium. Conversely, when the rotating shaft 101 rotates counterclockwise, the inlet plate 202 will extend into the annular groove 104 and block the medium from entering the assembly end 2. Therefore, the inlet plate 202 needs to be retracted into the assembly end 2.

[0022] Second implementation method: Compared to the first implementation, the main addition is an export module 301, the specific new structure of which is as follows, while the rest of the structure is the same as the first implementation.

[0023] Figures 6 to 9 As shown, the surface of the rotating shaft 101 has an insertion groove 3, which corresponds horizontally to the channel outlet 106. An outlet module 301 is inserted into the insertion groove 3, with one end of the outlet module 301 extending into the channel outlet 106. This facilitates the installation and fixation of the outlet module 301 within the channel outlet 106, allowing for the separate handling of the discharge of the flowing medium within the channel outlet 106. A closed tongue 302 is fixedly connected to the end of the outlet module 301 extending into the channel outlet 106. The closed tongue 302 is connected to the channel outlet 106... The inner wall contacts the corresponding part, and the closed tongue 302 is made of elastic rubber material. The closed tongue 302 controls the flow space of the channel outlet 106, thereby controlling the flow rate of the medium entering the annular groove 104, thereby relieving the sealing pressure of the sealing ring 105 in the annular groove 104. The closed tongue 302 is fixedly connected to the inside of the closed tongue 302. The support spring 303 is curved in an arc shape and is made of elastic stainless steel material. The support spring 303 effectively improves the elasticity of the closed tongue 302. By installing the outlet module 301 in the insertion groove 3 on the surface of the rotating shaft 101, the outlet module 301 is installed in the corresponding channel outlet 106. The closed tongue 302 on the outlet module 301 controls the flow space of the channel outlet 106, thereby controlling the flow rate of the circulating medium into the annular groove 104. By reducing the flow rate of the circulating medium into the annular groove 104, the sealing pressure of the sealing ring 105 in the annular groove 104 is relieved, and the circulating medium is not completely cut off, so that the rotary joint can maintain the medium flow capacity.

[0024] Figures 6 to 10As shown, a movable chamber 304 is fixedly connected to the middle of the outlet module 301. The movable chamber 304 corresponds to the axis of the rotating shaft 101, and a magnetic ball 305 is placed inside the movable chamber 304. A tension wire 306 is threaded through the middle of the magnetic ball 305. One end of the support spring 303 is fixedly connected to the tension wire 306. By utilizing the influence of the magnetic ball 305 in the movable chamber 304 on the tension wire 306, the support spring 303 is deformed, thereby controlling the size of the closed tongue 302 and thus controlling the medium flow capacity of the channel outlet 106. An electromagnetic column module 307 is fixedly connected to the middle of the telescopic cylinder 201. The magnetic ball 305 is horizontally corresponding to the electromagnetic column module 307. By utilizing the magnetic influence of the electromagnetic column module 307 on the magnetic ball 305, the position of the magnetic ball 305 in the movable chamber 304 is changed. The electromagnetic column module 307 exerts a magnetic force on the magnetic ball 305. Referring to the attached diagram, the electromagnetic column module 307 exerts a repulsive force on the magnetic ball 305, changing its position within the movable chamber 304. This change in position allows the magnetic ball 305 to exert a pulling force on the supporting spring 303 via the tension wire 306, altering the curvature of the supporting spring 303. This reduces the outward bulge of the closed tongue 302, increasing the flow space at the channel outlet 106 and thus increasing the discharge flow rate. Conversely, when the repulsive force on the magnetic ball 305 decreases, it returns to the center position of the movable chamber 304. The supporting spring 303 resumes its supporting and lifting function on the closed tongue 302, causing the closed tongue 302 to occupy more of the flow space at the channel outlet 106, thus reducing the discharge flow rate at the channel outlet 106.

[0025] In light of current practical needs, the above-described embodiments adopted in this application are not limited to this scope of protection. Various changes made within the knowledge of those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A multi-pass rotary union with a balanced mechanical seal structure, characterized by: The device includes a rotating shaft (101) and a housing (102) that are rotatably connected to each other. An input channel (103) is provided inside the rotating shaft (101). An annular groove (104) is provided on the inner surface of the housing (102). Sealing rings (105) are fitted between the upper and lower ends of the annular groove (104) and the rotating shaft (101). The inner end of the input channel (103) is parallel to and corresponds to the annular groove (104), and a channel outlet (106) is provided at the inner end of the input channel (103) corresponding to the annular groove (104). A connecting hole (107) is provided on the outer side of the annular groove (104). The channel outlet (106) is tangent to the cross section of the rotating shaft (101). A connecting end (2) is inserted into the outside of the connecting hole (107). A telescopic cylinder (201) is movably connected inside the connecting end (2). An inlet piece (202) is fixedly connected to one end of the telescopic cylinder (201). The inlet piece (202) extends into the annular groove (104) and faces the channel outlet (106). A pressure monitoring module (203) is fixedly connected to the inner wall of the connecting end (2). The back of the inlet piece (202) is slidably connected to the monitoring end of the pressure monitoring module (203).

2. A multi-channel rotary union with a balanced mechanical seal structure according to claim 1, characterized in that: The other end of the telescopic cylinder (201) is fixedly connected to a ring (204), and a retractable spring (205) is sleeved between the ring (204) and the middle of the inner wall of the assembly end (2).

3. A multi-channel rotary union with a balanced mechanical seal structure according to claim 2, characterized in that: The end of the assembly end (2) away from the connection hole (107) is rotatably connected to an electric screw shaft (206), and the cylindrical ring (204) is threadedly connected to the electric screw shaft (206).

4. The multi-channel rotary union with balanced mechanical seal structure of claim 1, wherein: The output end of the assembly terminal (2) is fixedly connected to a flow sensor, and the output end of the flow sensor and the output end of the pressure monitoring module (203) are jointly connected to a leakage alarm module.

5. A multi-channel rotary union with a balanced mechanical seal structure as defined in claim 1, wherein: The surface of the rotating shaft (101) is provided with a insertion groove (3), which is horizontally corresponding to the channel outlet (106), and an outlet module (301) is inserted into the inside of the insertion groove (3), with one end of the outlet module (301) extending into the channel outlet (106).

6. A multi-channel rotary union with a balanced mechanical seal structure according to claim 5, characterized in that: The outlet module (301) is fixedly connected to a closed tongue pack (302) at one end that extends into the channel outlet (106). The closed tongue pack (302) is in contact with the inner wall of the channel outlet (106) and is made of elastic rubber material.

7. A multi-channel rotary union with a balanced mechanical seal structure according to claim 6, characterized in that: The closed tongue pack (302) is internally fixedly connected to a support spring (303), which is curved in an arc shape and is made of elastic stainless steel.

8. A multi-channel rotary joint with a balanced mechanical seal structure according to claim 7, characterized in that: The outlet module (301) is fixedly connected to a movable chamber (304) in the middle. The movable chamber (304) corresponds to the axis of the rotating shaft (101). A magnetic ball (305) is placed inside the movable chamber (304). A tension wire (306) is threaded through the middle of the magnetic ball (305). One end of the support spring (303) is fixedly connected to the tension wire (306).

9. A multi-channel rotary joint with a balanced mechanical seal structure according to claim 8, characterized in that: The middle part of the telescopic cylinder (201) is fixedly connected with an electromagnetic column module (307), and the magnetic ball (305) horizontally corresponds to the electromagnetic column module (307).

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