Air pressure distribution swivel

Abstract

The application discloses a gas pressure distribution rotary device, which comprises a first rotary ring and a second rotary ring. The first rotary ring and the second rotary ring are adapted to be combined and separated in an axial direction. The second rotary ring is located on the inner side of the first rotary ring. A plurality of first channels are arranged on the first rotary ring in a radial direction. A plurality of gas flow-through areas are arranged on the outer side of the second rotary ring. The first rotary ring and the second rotary ring are adapted to rotate relative to each other, so that the gas flow-through areas are connected with the inner side ends of the first channels at different positions through the rotary combination interface. Sealing elements are arranged on the rotary combination interface of the first rotary ring and the second rotary ring. The sealing elements are arranged around the circumferential side of at least one gas flow-through area or the inner side end of at least one first channel. When the gas flow-through areas are connected with the inner side ends of the first channels, the sealing elements are adapted to seal the connection. The application has the characteristics of reliable dynamic sealing, convenient pipeline arrangement and expansion.

Description

Technical Field

[0001] This application relates to the field of gas distribution device technology, specifically to a gas pressure distribution rotary device. Background Technology

[0002] In automated processing and packaging equipment, it is often necessary to distribute air pressure to multiple workstations to perform operations such as adsorption and purging of workpieces. These application scenarios require the air pressure distribution device to selectively supply air or evacuate a specific channel according to the needs of different workstations, while cutting off the air supply to workstations where air supply is not required.

[0003] Currently, the conventional solution to achieve the above functions usually adopts a combination structure of "one inlet and multiple outlets" pneumatic rotary joint and solenoid valve. The multiple outlets of the pneumatic rotary joint are usually arranged circumferentially on the end face of the outlet component. The outlet component and the inlet component of the pneumatic rotary joint are combined in the form of a planar seal. The inlet of the pneumatic rotary joint is connected to the air source (positive pressure air source or vacuum generator). The multiple outlets are connected to each workstation through pipelines. A solenoid valve is installed on the pipeline of each outlet. The solenoid valve is controlled by the electrical control system to open and close the inlet and outlet, so that the workstation obtains negative pressure (vacuum) or positive pressure gas. When the workstation no longer needs the air pressure, the control system sends a signal to close the corresponding solenoid valve and cut off the air path of the workstation.

[0004] However, existing gas distribution devices have the following drawbacks: due to the constraints of the connector body size, structural strength, and valve pipeline structure, the number of outlets that can be opened on the end face of the connector is limited. When the equipment needs to increase the number of air pressure distribution channels, it is often necessary to replace the rotary connector with a larger diameter specification. This not only significantly increases the cost but also further exacerbates the complexity of the pipeline. At the same time, with the increase in diameter, the difficulty of planar sealing also increases, and the reliability of the seal is difficult to guarantee. In addition, the method of disassembling and assembling the sealing ring of the existing pneumatic rotary connector usually requires passing through its shaft. When the sealing ring wears and causes the sealing performance to decline, it is difficult to disassemble and assemble the sealing ring while the pneumatic rotary connector is connected to the shaft, making maintenance difficult. Summary of the Invention

[0005] One objective of this application is to provide a gas pressure distribution rotary device that is compact in structure, has reliable dynamic sealing, and is convenient for gas outlet pipeline arrangement and expansion.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a pneumatic pressure distribution rotary device, comprising a first rotating ring and a second rotating ring, the first rotating ring and the second rotating ring being adapted to be nested and disengaged along the axial direction, the second rotating ring being located inside the first rotating ring, the first rotating ring having a plurality of first channels radially penetrating it, the second rotating ring having a plurality of gas flow areas on its outer side, the second rotating ring having a second channel communicating with the gas flow areas and the outside, the gas flow areas being adapted to engage with one or more of the first channels, the first rotating ring and the second rotating ring being adapted to rotate relative to each other so that the gas flow areas are engaged and connected with the inner ends of the first channels at different positions at the rotational engagement interface, a sealing element being provided at the rotational engagement interface of the first rotating ring and the second rotating ring, the sealing element surrounding the periphery of at least one of the gas flow areas, or surrounding the inner end of at least one of the first channels, the sealing element being adapted to seal the connection when the gas flow area is engaged and connected with the inner end of the first channel.

[0007] In some embodiments, the first rotating ring is provided with multiple sets of the first channels at intervals along the axial direction, and the second rotating ring is provided with multiple sets of the gas flow areas at intervals along the axial direction, wherein each set of the first channels and each set of the gas flow areas are adapted to correspond to each other.

[0008] In some embodiments, the first rotating ring and the second rotating ring are in a radial clearance fit, the seal has a deformable capability, the seal abuts against the first rotating ring and the second rotating ring, and the seal is adapted to align the rotation axis of the first rotating ring and the rotation axis of the second rotating ring.

[0009] In some embodiments, a gap detection device is provided between the first rotating ring and the second rotating ring. The gap detection device includes a rotating shaft end and a detection end. The rotating shaft end is rotatably connected to the end face of the second rotating ring. The axis of the rotating shaft end is parallel to the axis of the second rotating ring. The outer periphery of the detection end is clearance-fitted with the first rotating ring. When the first rotating ring is eccentric relative to the second rotating ring, the detection end is adapted to contact the first rotating ring and move with the rotation of the first rotating ring.

[0010] In some embodiments, a receiving groove is provided on the first rotating ring or the second rotating ring, and the sealing member is disposed in the receiving groove. The sealing member is adapted to disengage from the rotating engagement interface of the first rotating ring and the second rotating ring along with the receiving groove.

[0011] In some embodiments, the receiving groove is formed on the outer periphery of the second rotating ring, the receiving groove being configured to cooperate with the distribution of the gas flow area and the first channel, and a portion of the sealing member protrudes from the receiving groove and is adapted to contact the first rotating ring.

[0012] In some embodiments, the seal includes a flexible skeleton, the outer side of which is covered with a friction-reducing layer, the friction coefficient of which is lower than that of the flexible skeleton.

[0013] In some embodiments, a positioning device is provided between the first rotating ring and the second rotating ring. The positioning device includes an elastic element, a positioning post, and a positioning groove. The elastic element and the positioning post are arranged radially on the first rotating ring. The positioning groove is circumferentially formed on the periphery of the second rotating ring. When the first rotating ring and the second rotating ring are engaged, the elastic element is adapted to cause the top end of the positioning post to abut against the positioning groove radially along the first rotating ring. The top end of the positioning post is arc-shaped, and the shape of the positioning groove is adapted to the top end of the positioning post.

[0014] In some embodiments, the first rotating ring and the second rotating ring are axially engaged with each other and form a contact interface. The first rotating ring and / or the second rotating ring are provided with an ejector device, which is adapted to protrude from the contact interface so that the first rotating ring and the second rotating ring can move relative to each other axially.

[0015] In some embodiments, the second rotating ring has an axial hole adapted to connect to the shaft of a control device; the first rotating ring and the second rotating ring cooperate with each other in the radial direction and form at least a partial rotating engagement interface.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: 1. The pneumatic distribution rotary device of this application achieves gas path switching by directly connecting the gas flow area and the inner end of the first channel at the rotational interface through the relative rotation of the first and second rotating rings. This fundamentally eliminates the need for independently configuring solenoid valves in each outlet channel. The opening and closing of the gas path is entirely determined by the relative angular position of the first and second rotating rings, eliminating the need for additional electrical control circuits and drive components. This significantly reduces the number of pipes, pipe joints, and electrical wiring, lowers system complexity and potential leakage points, improves overall operational reliability, and simplifies daily equipment maintenance. Furthermore, this application sets at the rotational interface... The sealing element surrounds the periphery of the gas flow area or the inner end of the first channel to partially seal the connection between the gas flow area and the first channel. This sealing method concentrates the sealing area around each connection part, avoiding uneven stress and leakage risks caused by large-area sealing, and improving the targeting and reliability of dynamic sealing. The sealing element is independently set on the surface area of ​​the second rotating ring (or the first rotating ring). During disassembly and assembly, the sealing element can be directly accessed by separating the first rotating ring and the second rotating ring along the axial direction without disassembling other parts. Moreover, the sealing element does not pass through the shaft, making the disassembly and maintenance of the sealing element simpler and faster, and effectively shortening maintenance downtime.

[0017] 2. The air outlet (outer end of the first channel) of the air pressure distribution rotary device of this application can be expanded and increased in a row along the axial direction of the first rotating ring, with strong expansion capability, high space utilization, and structural expansion will not affect its sealing performance, thus having high reliability.

[0018] 3. The installation position of the seal of the air pressure distribution rotary device of this application is limited by the positioning groove. The seal achieves sealing through the interference fit between the seal and the first rotating ring and the second rotating ring. The compression is fixed, and the reliability of the dynamic seal can be guaranteed without the need for a clamping device. The structure is simpler and more compact. Attached Figure Description

[0019] Figure 1 This is an overall structural view according to a preferred embodiment of the present application.

[0020] Figure 2 This is an exploded view of a preferred embodiment of the present application.

[0021] Figure 3 This is a front view according to a preferred embodiment of the present application.

[0022] Figure 4 This is a preferred embodiment according to this application. Figure 3 A cross-sectional view showing the gas flow area along the AA direction and the first channel.

[0023] Figure 5 This is a top view according to a preferred embodiment of the present application.

[0024] Figure 6 This is a preferred embodiment according to this application. Figure 5 A cross-sectional view showing the arrangement of the gap detection device, positioning device, and ejection device along the BB direction.

[0025] In the diagram: 1. First rotating ring component; 11. First channel; 2. Second rotating ring component; 21. Shaft hole; 22. Gas flow area; 23. Second channel; 24. Receiving groove; 25. Retaining ring; 251. Contact port; 3. Sealing component; 4. Gap detection device; 41. Shaft end; 42. Detection end; 421. Indicator; 5. Positioning device; 51. Elastic component; 52. Positioning post; 53. Positioning groove; 6. Ejection device; L1. First gas flow area; L2. Second gas flow area; L3. Third gas flow area. Detailed Implementation

[0026] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0028] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0030] The following description, in conjunction with the accompanying drawings, further illustrates this application: like Figures 1 to 6 As shown, this application provides a pneumatic distribution rotary device, including a first rotating ring 1 and a second rotating ring 2. The first rotating ring 1 and the second rotating ring 2 are adapted to be nested and disengaged along the axial direction. The second rotating ring 2 is located inside the first rotating ring 1 (inner hole). The first rotating ring 1 and the second rotating ring 2 can rotate relative to each other. The second rotating ring 2 has a shaft hole 21 along the axial direction, which is adapted to connect the shaft of a control device.

[0031] The first rotating ring 1 has multiple first channels 11 arranged radially through it. The second rotating ring 2 has multiple gas flow areas 22 on its outer side. The second rotating ring 2 has a second channel 23 that communicates with the gas flow areas 22 and the outside. The first channel 11 serves as a gas outlet, and the second channel 23 serves as a gas inlet. The gas flow area 22 is adapted to extend and cover along the circumference of the second rotating ring 2. Depending on the extension and coverage angle of the gas flow area 22, the gas flow area 22 is adapted to connect with one or more first channels 11. The first rotating ring 1 and the second rotating ring 2 are adapted to rotate relative to each other so that the gas flow area 22 connects and communicates with the inner end of the first channel 11 at different positions at the rotation interface, thereby realizing the switching of the gas path. This application can fundamentally eliminate the need for an independent solenoid valve on each gas outlet channel. The opening and closing of the gas path is completely determined by the relative angular position of the first rotating ring 1 and the second rotating ring 2. No additional electrical control lines and drive components are required, which significantly reduces the number of pipelines, pipe joints, and electrical wiring, reduces system complexity and potential leakage points, improves overall operational reliability, and simplifies the daily maintenance of the equipment.

[0032] It is understandable that by designing the number of gas flow zones 22 and the coverage angle of each gas flow zone 22, different functions can be achieved for each gas flow zone 22. Each gas flow zone 22, when rotated to different angles, can perform different functions, such as: vacuuming from 0 to 100 degrees, pressure holding from 100 to 200 degrees, pressurization A from 200 to 300 degrees, and pressurization B from 300 to 360 degrees, thus achieving pressure distribution in different areas. Figure 4 In the embodiment shown, the second rotating ring 2 has three gas flow zones 22. The first gas flow zone L1 is used for gas intake and pressurization, the second gas flow zone L2 is used for pressure maintenance without gas flow, and the third gas flow zone L3 is used for vacuuming.

[0033] In some embodiments, the first rotating ring 1 and the second rotating ring 2 cooperate with each other in the radial direction and form at least a partial rotating engagement interface.

[0034] like Figures 1 to 3 and Figure 6In the embodiment shown, the first rotating ring 1 is arranged with multiple sets of first channels 11 at intervals along the axial direction, and the second rotating ring 2 is arranged with multiple sets of gas flow areas 22 at intervals along the axial direction. Each set of first channels 11 and each set of gas flow areas 22 are adapted to cooperate one-to-one. The cooperation mechanism of each set of paired first channels 11 and gas flow areas 22 is the same, and they can operate independently without interfering with each other, which facilitates the expansion of the number of gas paths.

[0035] The first channel 11 of this application is radially disposed on the first rotating ring 1, and the gas flow area 22 is opened on the outside of the second rotating ring 2. The connection between the two occurs at the rotating interface on the outer periphery of the axially nested cylindrical structure. Compared with the traditional solution where the outlet is arranged along a single plane, the cylindrical interface provides a larger usable layout area. The first channel 11 can be arranged in layers along the axial direction and in rows along the circumference, thereby achieving a greater number of channels within a limited radial dimension. The structure is more compact, and more gas outlets can be arranged and reserved in the same volume. When the equipment needs to increase the number of extended gas channels, it can achieve greater expandability with a smaller volume increase.

[0036] like Figure 2 , Figure 4 and Figure 6 In the embodiment shown, a sealing element 3 is provided at the rotational interface of the first rotating ring 1 and the second rotating ring 2. The sealing element 3 surrounds the periphery of at least one gas flow area 22 or surrounds the inner end of at least one first channel 11. When the gas flow area 22 is connected to the inner end of the first channel 11, the sealing element 3 is suitable for sealing one or more connected positions to achieve local dynamic sealing and prevent gas leakage at the rotational interface.

[0037] This application provides a sealing element 3 at the rotating joint interface. The sealing element 3 surrounds the periphery of the gas flow area 22 or the inner end of the first channel 11, and performs local dynamic sealing at the docking and connection point of the gas flow area 22 and the first channel 11. This sealing method concentrates the sealing area around each connecting part, avoids the uneven stress and leakage risk caused by large-area sealing, and improves the targeting and reliability of dynamic sealing.

[0038] Meanwhile, since the seal 3 is independently set on the surface area of ​​the first rotating ring 1 and the second rotating ring 2, the seal 3 can be easily disassembled and replaced. During disassembly and assembly, the first rotating ring 1 and the second rotating ring 2 can be separated axially to directly access the seal 3. The seal 3 does not need to pass through the shaft at the second rotating ring 2 when it is removed. Therefore, it is not necessary to remove the entire rotary device from the shaft to replace the seal 3. It can be seen that the disassembly and maintenance operation of the seal 3 of the rotary device is extremely simple and quick, which can effectively shorten the maintenance downtime.

[0039] It is understood that the installation design of the above-mentioned sealing element 3 can be adapted to the arrangement of each pair of first channels 11 and gas flow areas 22, or to the arrangement of multiple pairs of first channels 11 and gas flow areas 22. For example, the sealing element 3 can be set to seal only the connection position of the first channel 11 and gas flow area 22 within the same axial section (the same group), or the sealing element 3 can be set to seal the connection position of the first channel 11 and gas flow area 22 within adjacent axial sections (multiple groups), which meets the expandability requirements of the first rotating ring 1 and the second rotating ring 2.

[0040] In some embodiments, the first rotating ring 1 and the second rotating ring 2 are in a clearance fit in the radial direction, the seal 3 has a deformable capability, the seal 3 abuts against the first rotating ring 1 and the second rotating ring 2, and the seal 3 is adapted to align the rotating shaft of the first rotating ring 1 and the rotating shaft of the second rotating ring 2.

[0041] It is understood that the stable relative rotation between the first rotating ring 1 and the second rotating ring 2 in this application is mainly achieved through the seal 3. The first rotating ring 1 and the second rotating ring 2 do not come into contact, so there is no wear. As a wear component, the seal 3 is designed to be highly convenient for maintenance and replacement. Therefore, the rotary device of this application has a better service life and easier maintenance.

[0042] It is understandable that, since the stable relative rotation between the first rotating ring 1 and the second rotating ring 2 in this application is mainly achieved through the sealing element 3, when setting the positions of the first channel 11, the gas flow area 22 and the sealing element 3, the coverage of the sealing element 3 in the circumferential direction of the rotating joint interface must be taken into account, so as to avoid the first rotating ring 1 and the second rotating ring 2 from not being able to align their rotating shafts when rotating due to the different support effects formed by the sealing element 3 at different positions in the circumferential direction of the rotating joint interface.

[0043] In some embodiments, the seal 3 has elastic deformation capability. The seal 3 can help the first rotating ring 1 and the second rotating ring 2 to continuously maintain the alignment of the rotating shaft during relative rotation by the elastic deformation generated after being compressed by the first rotating ring 1 and the second rotating ring 2.

[0044] In some embodiments, the seal 3 includes a flexible skeleton with a certain elastic deformation capability. The flexible skeleton enables the seal 3 to be bent into various shapes, more effectively adapting to the curved rotational interface, reducing contact pressure, and reducing wear. The outer side of the flexible skeleton is covered with a friction-reducing layer, and the friction coefficient of the friction-reducing layer is lower than that of the flexible skeleton.

[0045] In some embodiments, the flexible skeleton is made of rubber, and the friction-reducing layer is made of polytetrafluoroethylene.

[0046] like Figures 1 to 3 , Figures 5 to 6 In the illustrated embodiment, in order to sense the wear degree of the seal 3, which is a wear component, so as to facilitate timely maintenance and replacement of the seal 3, a gap detection device 4 is provided between the first rotating ring 1 and the second rotating ring 2. The gap detection device 4 includes a rotating shaft end 41 and a detection end 42. The rotating shaft end 41 is rotatably connected to the end face of the second rotating ring 2. The axis of the rotating shaft end 41 is parallel to the axis of the second rotating ring 2. The outer periphery of the detection end 42 is clearance-fitted with the first rotating ring 1. When the first rotating ring 1 is eccentric relative to the second rotating ring 2, the detection end 42 is adapted to contact the first rotating ring 1 and move with the rotation of the first rotating ring 1. The gap detection device 4 detects the alignment state of the first rotating ring 1 and the second rotating ring 2 and magnifies and displays it as its own movement, thereby increasing the reminder effect.

[0047] It is worth noting that after the first rotating ring 1 and the second rotating ring 2 are initially assembled and joined, the first rotating ring 1 and the second rotating ring 2 need to be driven to rotate relative to each other, and the status of the gap detection device 4 should be observed to ensure that the gap detection device 4 is not accidentally triggered when the rotary device is running stably, so that the detection function can be realized normally.

[0048] like Figure 1 , Figure 2 and Figure 5 In the embodiment shown, the probe end 42 is provided with an eccentrically arranged indicator part 421. The indicator part 421 can be a columnar protrusion. The probe end 42 is adapted to contact the first rotating ring 1 and rotate with the rotation of the first rotating ring 1. At this time, by observing the position of the indicator part 421, the operating status of the gap detection device 4 can be more intuitively and effectively confirmed.

[0049] In some embodiments, a receiving groove 24 is provided on the first rotating ring 1 or the second rotating ring 2, and the sealing member 3 is disposed in the receiving groove 24. The sealing member 3 is adapted to disengage from the rotating interface of the first rotating ring 1 and the second rotating ring 2 with the receiving groove 24. The receiving groove 24 is used to improve the stability of the sealing member 3, that is, by increasing the contact area with the sealing member 3 and restricting the movement of the sealing member 3, the dynamic sealing performance of the sealing member 3 is improved. The receiving groove 24 is also used to improve the maintainability of the sealing member 3, so that the sealing member 3 can stably disengage from the rotating interface without being stuck.

[0050] like Figure 2 , Figure 4 and Figure 6In the embodiment shown, the receiving groove 24 is formed on the outer peripheral side of the second rotating ring 2. The receiving groove 24 is configured in conjunction with the distribution of the gas flow area 22 and the first channel 11. A portion of the sealing member 3 protrudes from the receiving groove 24 and is adapted to contact the first rotating ring 1. The portion of the sealing member 3 protruding from the receiving groove 24 supports the gap between the first rotating ring 1 and the second rotating ring 2.

[0051] like Figure 2 and Figure 6 In the illustrated embodiment, a positioning device 5 is provided between the first rotating ring 1 and the second rotating ring 2. The positioning device 5 includes an elastic element 51, a positioning post 52, and a positioning groove 53. The elastic element 51 and the positioning post 52 are arranged radially on the first rotating ring 1. The elastic element 51 is located outside the positioning post 52. The positioning groove 53 is circumferentially opened on the periphery of the second rotating ring 2. When the first rotating ring 1 and the second rotating ring 2 are engaged, the elastic element 51 is adapted to make the top end of the positioning post 52 abut against the positioning groove 53 radially along the first rotating ring 1, thereby stabilizing the axial position of the first rotating ring 1 and the second rotating ring 2. The elastic locking mechanism of the positioning device 5 facilitates the disassembly and separation of the first rotating ring 1 and the second rotating ring 2 without the need for other tools or equipment to assist in unlocking, thus reducing the difficulty of operation.

[0052] In some embodiments, the top end of the positioning post 52 is arc-shaped, and the shape of the positioning groove 53 is adapted to the top end of the positioning post 52, which can reduce the wear between the top end of the positioning post 52 and the positioning groove 53, and facilitate the disassembly and separation of the first rotating ring 1 and the second rotating ring 2.

[0053] In some embodiments, the first rotating ring 1 and the second rotating ring 2 are axially engaged with each other and form a contact interface. The first rotating ring 1 and / or the second rotating ring 2 are provided with an ejector device 6, which is adapted to protrude from the contact interface so that the first rotating ring 1 and the second rotating ring 2 can move relative to each other in the axial direction.

[0054] like Figure 1 , Figure 2 and Figure 6 In the embodiment shown, a retaining ring 25 is fixedly connected to one side end face of the second rotating ring 2, and an ejector device 6 is disposed on the retaining ring 25. The same side end face of the first rotating ring 1 is adapted to fit against the retaining ring 25 to form a contact interface. The ejector device 6 is adapted to contact the same side end face of the first rotating ring 1 and is adapted to protrude from the contact interface. With the elastic locking mechanism of the positioning device 5, the first rotating ring 1 and the second rotating ring 2 can move relative to each other along the axial direction and separate.

[0055] The retaining ring 25 has a contact port 251, and the inner edge of the first rotating ring 1 is exposed in the contact port 251. The gap detection device 4 is disposed near the contact port 251 and is adapted to sense the inner edge of the first rotating ring 1 in the contact port 251.

[0056] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are only the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope of this application. All such changes and modifications fall within the scope of this application as claimed. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A pneumatic pressure distribution rotary device, characterized in that: The device includes a first rotating ring and a second rotating ring. The first and second rotating rings are adapted to be nested and disengaged along the axial direction. The second rotating ring is located inside the first rotating ring. The first rotating ring has multiple first channels that are radially through it. The second rotating ring has multiple gas flow areas on its outer side. The second rotating ring has a second channel that communicates with the gas flow areas and the outside. The gas flow areas are adapted to connect with one or more of the first channels. The first and second rotating rings are adapted to rotate relative to each other so that the gas flow areas are connected to the inner ends of the first channels at different positions at the rotational connection interface. A sealing element is provided at the rotational connection interface of the first and second rotating rings. The sealing element surrounds the periphery of at least one of the gas flow areas or surrounds the inner end of at least one of the first channels. When the gas flow area is connected to the inner end of the first channel, the sealing element is adapted to seal the connection.

2. The pneumatic pressure distribution rotary device as described in claim 1, characterized in that: The first rotating ring is provided with multiple sets of the first channels arranged at intervals along the axial direction, and the second rotating ring is provided with multiple sets of the gas flow areas arranged at intervals along the axial direction. Each set of the first channels and each set of the gas flow areas are adapted to be matched one-to-one.

3. The pneumatic pressure distribution rotary device as described in claim 1, characterized in that: The first rotating ring and the second rotating ring are in a radial clearance fit. The seal has deformation capability and abuts against the first rotating ring and the second rotating ring. The seal is adapted to align the rotating shafts of the first rotating ring and the second rotating ring.

4. The pneumatic pressure distribution rotary device as described in claim 3, characterized in that: A gap detection device is provided between the first rotating ring and the second rotating ring. The gap detection device includes a rotating shaft end and a detection end. The rotating shaft end is rotatably connected to the end face of the second rotating ring. The axis of the rotating shaft end is parallel to the axis of the second rotating ring. The outer periphery of the detection end is clearance-fitted with the first rotating ring. When the first rotating ring is eccentric relative to the second rotating ring, the detection end is adapted to contact the first rotating ring and move with the rotation of the first rotating ring.

5. The pneumatic pressure distribution rotary device as described in claim 1, characterized in that: The first rotating ring or the second rotating ring is provided with a receiving groove, and the sealing member is disposed in the receiving groove. The sealing member is adapted to disengage from the rotating joint interface of the first rotating ring and the second rotating ring along with the receiving groove.

6. The pneumatic pressure distribution rotary device as described in claim 5, characterized in that: The receiving groove is formed on the outer periphery of the second rotating ring. The receiving groove is configured to cooperate with the distribution of the gas flow area and the first channel. A portion of the sealing member protrudes from the receiving groove and is adapted to contact the first rotating ring.

7. The pneumatic pressure distribution rotary device as described in claim 1, characterized in that: The seal includes a flexible skeleton, the outer side of which is covered with a friction-reducing layer, the friction coefficient of which is lower than that of the flexible skeleton.

8. The pneumatic pressure distribution rotary device as described in claim 1, characterized in that: A positioning device is provided between the first rotating ring and the second rotating ring. The positioning device includes an elastic element, a positioning post, and a positioning groove. The elastic element and the positioning post are arranged radially on the first rotating ring. The positioning groove is opened circumferentially on the periphery of the second rotating ring. When the first rotating ring and the second rotating ring are engaged, the elastic element is adapted to make the top end of the positioning post abut against the positioning groove radially along the first rotating ring. The top end of the positioning post is arc-shaped, and the shape of the positioning groove is adapted to the top end of the positioning post.

9. The pneumatic pressure distribution rotary device as described in claim 1, characterized in that: The first rotating ring and the second rotating ring are axially engaged and form a contact interface. The first rotating ring and / or the second rotating ring are provided with an ejector device, which is adapted to protrude from the contact interface so that the first rotating ring and the second rotating ring can move relative to each other along the axial direction.

10. A pneumatic pressure distribution rotary device as described in any one of claims 1 to 9, characterized in that: The second rotating ring has an axial hole, which is suitable for connecting the shaft of the control device; the first rotating ring and the second rotating ring cooperate with each other in the radial direction and form at least a partial rotating engagement interface.

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