Fluid slip ring, cooling system and wind generating set

Abstract

The utility model provides a fluid slip ring, a cooling system and a wind generating set. The fluid slip ring comprises a slip ring inner ring and a slip ring outer ring, the slip ring outer ring is arranged on the periphery of the slip ring inner ring in a sleeving mode and can rotate relative to the slip ring inner ring, and an annular flow channel is formed between the slip ring inner ring and the slip ring outer ring. A plurality of axial flow channels extending in the axial direction of the fluid sliding ring are formed in one of the sliding ring inner ring and the sliding ring outer ring, the multiple axial flow channels are distributed in the circumferential direction of the fluid sliding ring at intervals, and each axial flow channel communicates with the annular flow channel. By arranging the multiple axial flow channels, the overall size of the fluid slip ring can be reduced under the condition that the requirement for large-flow fluid conveying is met.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and more specifically, to a fluid slip ring, a cooling system, and a wind turbine generator set. Background Technology

[0002] As offshore wind turbines become increasingly powerful, existing air-cooling technologies are no longer sufficient to meet their cooling requirements. Given the low temperature and high heat exchange mass flow rate of seawater, utilizing seawater for turbine cooling is a promising solution. However, a key challenge in employing seawater cooling is addressing the transmission of this large volume of cooling medium between the stationary and rotating components of the wind turbine (e.g., at the yaw position). Utility Model Content

[0003] This application provides a fluid slip ring and a wind turbine generator set to solve the problem of large-flow cooling medium transmission in existing wind turbine generator sets.

[0004] According to one aspect of this application, a fluid slip ring is provided, the fluid slip ring including an inner ring and an outer ring, the outer ring being sleeved on the outer periphery of the inner ring and rotatable relative to the inner ring, a circumferential flow channel being formed between the inner ring and the outer ring, and a plurality of axial flow channels extending along the axial direction of the fluid slip ring being formed on one of the inner ring and the outer ring, the plurality of axial flow channels being spaced apart in the circumferential direction of the fluid slip ring, and each axial flow channel communicating with the circumferential flow channel.

[0005] According to one aspect of this application, the axial flow channel includes at least one first axial flow channel and at least one second axial flow channel, and the circumferential flow channel includes a first circumferential flow channel and a second circumferential flow channel spaced apart from each other in the axial direction of the fluid slip ring, wherein the first axial flow channel and the first circumferential flow channel are connected, and the second axial flow channel and the second circumferential flow channel are connected.

[0006] According to one aspect of this application, the inner ring of the slip ring is cylindrical, thereby forming a hollow channel inside the inner ring of the slip ring. The axial flow channel is formed in the cylindrical wall of the inner ring of the slip ring. A first through hole is provided on the radial outer wall of the first axial flow channel, which connects the first axial flow channel with the first circumferential flow channel. A second through hole is provided on the outer wall of the second axial flow channel, which connects the second axial flow channel with the second circumferential flow channel.

[0007] According to one aspect of this application, at least one first fluid inlet / outlet is provided on the outer wall of the first circumferential flow channel, enabling the first circumferential flow channel to communicate with the outside, and at least one second fluid inlet / outlet is provided on the outer wall of the second circumferential flow channel, enabling the second circumferential flow channel to communicate with the outside, and the first fluid inlet / outlet and the second fluid inlet / outlet are arranged alternately in the circumferential direction of the fluid slip ring.

[0008] According to one aspect of this application, the first fluid inlet and outlet are arranged in pairs and opposite to each other, the second fluid inlet and outlet are arranged in pairs and opposite to each other, and the first fluid inlet and outlet and the second fluid inlet and outlet are alternately arranged and evenly distributed in the circumferential direction of the fluid slip ring.

[0009] According to one aspect of this application, a sealing ring mounting groove is formed on the inner surface of the outer ring of the slip ring or on the outer surface of the inner ring of the slip ring, and a first sealing ring is installed in the sealing ring mounting groove, wherein the side of the first sealing ring facing the groove opening of the sealing ring mounting groove is a friction surface.

[0010] According to one aspect of this application, a second sealing ring is further provided in the sealing ring mounting groove, the second sealing ring being stacked with the first sealing ring, and the hardness of the first sealing ring being greater than the hardness of the second sealing ring.

[0011] According to one aspect of this application, the first sealing ring and the second sealing ring are constructed as Glyd rings.

[0012] According to one aspect of this application, the fluid slip ring further includes a first sliding bearing and a third sealing ring disposed between the radially outer side of the inner ring of the slip ring and the radially inner side of the outer ring of the slip ring. The first sliding bearing is located on one axial side of the circumferential flow channel, and the third sealing ring is disposed between the annular flow channel and the first sliding bearing. The third sealing ring is a skeleton sealing ring, and the opening of the skeleton sealing ring faces the annular flow channel.

[0013] According to one aspect of this application, a first liquid storage tank is further provided between the annular flow channel and the third sealing ring. The first liquid storage tank is connected to the skeleton sealing ring, and a first discharge hole is provided at the position corresponding to the first liquid storage tank on the outer ring of the slip ring for discharging the grease in the first liquid storage tank to the outside.

[0014] According to one aspect of this application, the third sealing ring includes an inner ring abutting portion that abuts against the inner ring of the slip ring and an outer ring abutting portion that abuts against the outer ring of the slip ring. An annular tensioning spring is provided in the inner ring abutting portion so that the inner ring abutting portion is in close contact with the inner ring of the slip ring.

[0015] According to one aspect of this application, a stop rib is provided on the inner surface of the outer ring of the slip ring, the stop rib is located between the first liquid storage tank and the third sealing ring, and the outer ring abutting portion of the third sealing ring abuts against the stop rib.

[0016] According to one aspect of this application, the radially inner surface of the outer ring of the slip ring is concave to form the circumferential flow channel, the first sealing ring is located on both axial sides of the circumferential flow channel, and at least one first sealing ring is provided on each axial side of the circumferential flow channel.

[0017] According to one aspect of this application, a first end of the inner ring of the slip ring is provided with a shoulder protruding relative to the outer periphery of the inner ring of the slip ring, and the fluid slip ring further includes an annular end plate connected to a second end of the inner ring of the slip ring and protruding relative to the outer periphery of the inner ring of the slip ring. In the axial direction of the fluid slip ring, the outer ring of the slip ring is limited between the shoulder and the annular end plate.

[0018] According to one aspect of this application, the first sliding bearing is located between the circumferential flow channel and the shoulder, and the second sliding bearing is located between the circumferential flow channel and the annular end plate.

[0019] According to another aspect of this application, a cooling system is provided, the cooling system including the aforementioned fluid slip ring and a fluid delivery unit, the fluid delivery unit being capable of driving fluid to flow through the fluid slip ring.

[0020] According to another aspect of this application, a wind turbine generator set is provided, the wind turbine generator set including the cooling system described above, the inner ring of the slip ring being connected to a rotating component in the wind turbine generator set, and the outer ring of the slip ring being connected to a fixed component in the wind turbine generator set.

[0021] According to another aspect of this application, the inner ring of the slip ring is connected to a rotating component in the yaw system of the wind turbine generator set, and the outer ring of the slip ring is connected to a fixed component inside the tower of the wind turbine generator set.

[0022] According to the technical solution of this application, by setting multiple axial flow channels, the overall cross-sectional area of ​​the flow channels can be increased, thereby improving the fluid delivery capacity. Compared with the structure with a single axial flow channel, while obtaining the same flow cross-sectional area, the structure with multiple axial flow channels can reduce the wall thickness and diameter of the inner ring of the slip ring, thereby reducing the overall size of the fluid slip ring. This facilitates the lightweight structural design of the fluid slip ring and makes it easier to lift and maintain. Attached Figure Description

[0023] The above and other objects and features of this utility model will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a perspective view of a fluid slip ring according to an embodiment of this application;

[0025] Figure 2 This is a perspective view of the inner ring of a fluid slip ring according to an embodiment of this application;

[0026] Figure 3 This is a perspective view of the outer ring of a fluid slip ring according to an embodiment of this application;

[0027] Figure 4 This is a cross-sectional view of a fluid slip ring according to an embodiment of this application;

[0028] Figure 5 and Figure 6 yes Figure 4 A magnified view of a portion of the image;

[0029] Figure 7 This is an example diagram of the usage state of a fluid slip ring according to an embodiment of this application.

[0030] Tag name:

[0031] 100 - Slip ring inner ring; 110 - First axial flow channel; 111 - First through hole; 115 - Shoulder;

[0032] 120 - Second axial flow channel; 121 - Second through hole; 130 - Axial flow channel; 200 - Slip ring outer ring;

[0033] 210 - First circumferential flow channel; 211 - Inlet / outlet of the first circumferential flow channel; 220 - Second circumferential flow channel; 221 - Inlet / outlet of the second circumferential flow channel;

[0034] 226 - First rib; 227 - Second rib; 228 - Third rib; 230 - Sealing ring mounting groove;

[0035] 231 - First sealing ring; 233 - Second sealing ring; 310 - First sliding bearing;

[0036] 320 - Second sliding bearing; 330 - Third sealing ring; 331 - Tensioning spring; 333 - First liquid reservoir;

[0037] 334 - Stop rib; 335 - First discharge hole; 336 - Second storage tank; 337 - Second discharge hole;

[0038] 400 - Ring end plate; 440 - Connector; 600 - Cable. Detailed Implementation

[0039] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0040] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0041] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0042] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0043] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0044] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0045] The directional terms “above,” “below,” “top,” and “bottom” used in this application, unless otherwise specified, are based on the orientation of the product when it is in normal use.

[0046] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0047] This application provides a fluid slip ring, which will be described in detail below with reference to the accompanying drawings.

[0048] Figure 1 This is a perspective view of a fluid slip ring according to an embodiment of this application; Figure 2 This is a perspective view of the inner ring of a fluid slip ring according to an embodiment of this application; Figure 3 This is a perspective view of the outer ring of a fluid slip ring according to an embodiment of this application; Figure 4 This is a cross-sectional view of a fluid slip ring according to an embodiment of this application.

[0049] like Figures 1 to 4 As shown, the fluid slip ring according to an embodiment of this application includes an inner slip ring 100 and an outer slip ring 200. The outer slip ring 200 is sleeved on the outside of the inner slip ring 100 and is rotatable relative to the inner slip ring 100. A circumferential flow channel is formed between the radially inner side of the outer slip ring 200 and the radially outer side of the inner slip ring 100. One of the inner slip ring 100 and the outer slip ring 200 has a plurality of axial flow channels extending along the axial direction of the slip ring. The plurality of axial flow channels are spaced apart in the circumferential direction of the fluid slip ring, and each axial flow channel is connected to the circumferential flow channel.

[0050] As an example, the inner ring 100 of the slip ring is formed as a hollow cylinder, and multiple axial flow channels are formed in the cylinder wall of the inner ring 100 and spaced apart in the circumferential direction of the inner ring 100. By setting multiple axial flow channels, the overall cross-sectional area of ​​the flow channels can be increased, thereby increasing the fluid delivery rate. Compared with the structure with a single axial flow channel, while obtaining the same flow cross-sectional area, the structure with multiple axial flow channels 130 can reduce the wall thickness and diameter of the inner ring 100, thereby reducing the overall size of the fluid slip ring. This facilitates the lightweight structural design of the fluid slip ring and makes it easier to lift and maintain.

[0051] like Figures 1 to 4 As shown, at one axial end of the inner ring 100 of the slip ring, each axial flow channel has an axial flow channel inlet and outlet, through which the axial flow channel can communicate with the outside of the fluid slip ring. At the corresponding position of the circumferential flow channel on the outer ring 200 of the slip ring, an circumferential flow channel inlet and outlet is provided, through which the circumferential flow channel can communicate with the outside.

[0052] As an example of the application of the above-mentioned slip ring, the outer ring 200 of the slip ring is mounted on a fixed structure, and the inner ring 100 of the slip ring is connected to a rotating component so that it can rotate relative to the outer ring 200 of the slip ring. The cooling medium can be transported into the circumferential flow channel through the pipes connected to the inlet and outlet of the circumferential flow channel, and then enter multiple axial flow channels, and flow outward through the pipes connected to the inlet and outlet of the axial flow channels, thereby realizing the transfer of fluid between the rotating positions.

[0053] According to an embodiment of this application, a plurality of circumferential flow channels are provided in the fluid slip ring. The plurality of circumferential flow channels are spaced apart from each other in the axial direction of the fluid slip ring. The plurality of circumferential flow channels are respectively connected to the corresponding axial flow channels, thereby enabling the separate delivery of multiple fluids.

[0054] exist Figures 1 to 4 In the example shown, the fluid slip ring has two circumferential flow channels, namely a first circumferential flow channel 210 and a second circumferential flow channel 220. The two circumferential flow channels are separated from each other axially and are not interconnected. Correspondingly, the plurality of axial flow channels include at least one first axial flow channel 110 and at least one second axial flow channel 120. The first axial flow channel 110 and the first circumferential flow channel 210 are connected, and the second axial flow channel 120 and the second circumferential flow channel are connected. Specifically, a first through hole 111 is provided on the outer wall of the first axial flow channel 110 to connect the first axial flow channel 110 and the first circumferential flow channel 210, and a second through hole 121 is provided on the outer wall of the second axial flow channel to connect the second axial flow channel 120 and the second circumferential flow channel 220, thereby enabling fluid transfer between the rotating inner ring 100 of the slip ring and the stationary outer ring 200 of the slip ring.

[0055] The first axial flow channel 110 and the second axial flow channel 120 can each be configured as at least two. Multiple first axial flow channels 110 can be merged and used to cool a single component to be cooled, or they can be transported to multiple components to be cooled through multiple pipes, thereby achieving separate cooling of multiple components.

[0056] Furthermore, a first circumferential flow channel inlet / outlet 211 is provided on the outer wall of the slip ring 200 at a position corresponding to the first circumferential flow channel 210. This first circumferential flow channel inlet / outlet 211 can be connected to an external first fluid delivery pipe. Similarly, a second circumferential flow channel inlet / outlet 221 is provided on the outer wall of the slip ring 200 at a position corresponding to the second circumferential flow channel 220. This second circumferential flow channel inlet / outlet 221 can be connected to an external second fluid delivery pipe. The first fluid can be delivered through the first circumferential flow channel 210 and the first axial flow channel 110, and the second fluid can be delivered through the second circumferential flow channel 220 and the second axial flow channel 120, thereby enabling the separate delivery of the two fluids using the fluid slip ring of this embodiment.

[0057] As an application example of this fluid slip ring, it is installed at a corresponding position in the yaw system of a wind turbine generator. Cooling medium (e.g., seawater) located at a lower position enters the first circumferential flow channel 210 through the first circumferential flow channel inlet / outlet 211, then enters the first axial flow channel 110, and is then transported to the nacelle through the first axial flow channel 110 to cool the heat-generating components inside the nacelle. The cooled medium, after its temperature rises, returns to the second axial flow channel 120, then enters the second circumferential flow channel 220, and finally is discharged outwards through the second circumferential flow channel inlet / outlet 221. Therefore, the fluid slip ring according to the embodiments of this application can achieve bidirectional transport of the fluid medium.

[0058] According to embodiments of this application, two first circumferential flow channel inlets / outlets 211 can be configured, arranged opposite each other on the circumference of the first circumferential flow channel 210, and two second circumferential flow channel inlets / outlets 221 can also be configured, arranged opposite each other on the circumference of the second circumferential flow channel 220. By configuring at least two first circumferential flow channel inlets / outlets 211 and two second circumferential flow channel inlets / outlets 221 respectively, the size of a single opening can be reduced, avoiding excessively large local openings that could reduce the strength of the outer ring of the slip ring. Furthermore, this symmetrical arrangement allows for a more balanced force distribution in the circumferential direction during the operation of the fluid slip ring, thereby reducing the vibration amplitude or sliding amplitude of the fluid slip ring and making the system more stable. The first circumferential flow channel inlets / outlets 211 and the second circumferential flow channel inlets / outlets 221 can be arranged intersectingly in the circumferential direction of the fluid slip ring, spatially offset to avoid mutual interference, and facilitating installation and maintenance.

[0059] According to embodiments of this application, since multiple axial flow channels are provided on the inner ring 100 of the slip ring, the transport of large-flow fluid at the rotational connection between stationary components and rotating components can be realized, meeting the heat dissipation requirements of high-power units. Furthermore, by providing the first circumferential flow channel 210 and the second circumferential flow channel 220, as well as the corresponding first axial flow channel 110 and the second axial flow channel 120, the separate transport of two fluids and the bidirectional transport of large-flow fluid can also be realized, making it suitable for the water cooling requirements of wind turbine generator sets.

[0060] like Figure 4 As shown, a first sealing ring 231 is provided between the radially outer surface of the inner ring 100 and the radially inner surface of the outer ring 200. The first sealing ring 231 is provided on both sides of the axial direction of each circumferential flow channel to prevent fluid leakage through the gap between the inner ring 100 and the outer ring 200. The first sealing ring 231 is installed on one of the inner ring 100 and the outer ring 200 and makes sealing contact with the other of the inner ring 100 and the outer ring 200.

[0061] To prevent the first sealing ring 231 from moving axially in the fluid slip ring, the first sealing ring 231 is disposed in the sealing ring mounting groove 230. In the example shown in the attached figure, the sealing ring mounting groove 230 is disposed on the inner surface of the outer ring 200 of the slip ring; however, the position of the sealing ring mounting groove 230 is not limited to this, and the sealing ring mounting groove 230 may also be disposed on the outer surface of the inner ring 100 of the slip ring.

[0062] The friction surface of the first sealing ring 231 can be formed as a sawtooth shape. On the one hand, it can reduce the frictional resistance between the first sealing ring 231 and the inner ring 100 of the slip ring by reducing the frictional area. On the other hand, the lubricating grease can enter the sawtooth groove to form an oil film, thereby reducing the coefficient of friction and thus reducing the frictional resistance.

[0063] Because the first sealing ring 231 is in frictional contact with the inner ring 100 of the slip ring, the first sealing ring 231 needs to have a certain hardness to improve wear resistance, thereby ensuring the service life of the first sealing ring 231. Increased hardness will affect sealing performance to some extent. Therefore, to further ensure sealing performance, a second sealing ring 233 is also provided in the sealing ring mounting groove 230. The second sealing ring 233 and the first sealing ring 231 are stacked in the sealing ring mounting groove 230 to form a combined sealing ring. The elasticity of the second sealing ring 233 is greater than that of the first sealing ring 231. For example, the first sealing ring 231 is made of polytetrafluoroethylene, and the second sealing ring is an O-ring made of rubber material, thus the first sealing ring 231 and the second sealing ring 233 constitute a combined sealing ring. As an example, this combined sealing ring can be a Glycol sealing ring.

[0064] The first sealing ring 231 has high mechanical strength, good wear resistance, water resistance, and thermal conductivity, and a long service life. The O-ring is elastic and can consistently apply compressive force to the first sealing ring 231, ensuring that it remains in constant contact with the outer surface of the slip ring inner ring 100. Therefore, using a combined sealing ring can more effectively prevent liquid leakage. At least one additional Glyd ring can be provided on the outer side of the annular flow channel. For example, two Glyd rings can be provided on the axial outer side of the annular flow channel. When at least two annular flow channels are provided, only one Glyd ring can be provided between adjacent annular flow channels.

[0065] like Figure 4 As shown, the inner surface of the outer ring 200 of the slip ring is concave to form at least two annular grooves, which together with the outer surface of the inner ring 100 of the slip ring to form an annular flow channel. (See attached diagram) Figure 4 In the example, the inner surface of the slip ring outer ring 200 has three protruding ribs, namely the first rib 226, the second rib 227, and the third rib 228. A first circumferential flow channel 210 is formed between the first rib 226 and the second rib 227, and a second circumferential flow channel 220 is formed between the second rib 227 and the third rib 228. Figure 5 As shown, the sealing ring mounting groove 230 can be formed on each rib. As an example, two sealing structures can be provided on the first rib 226 and the third rib 228. Only one sealing structure can be provided on the second rib 227.

[0066] The inner ring 100 of the slip ring has guide slopes formed on it, for example, at both axial ends of the outer peripheral surface of the inner ring 100 and at both axial ends of the protrusions on the outer peripheral surface. When the inner ring 100 and the outer ring 200 of the slip ring are fitted together, the guide slopes act as guides, facilitating the assembly of the inner ring 100 and the outer ring 200. Furthermore, by providing guide slopes, interference between the sharp edges of the inner ring 100 and the second sealing ring 233 during assembly can be avoided, preventing the second sealing ring 233 from falling off.

[0067] To provide rotational support for the outer ring 200 of the slip ring, a sliding bearing is also provided between the inner ring 100 and the outer ring 200 of the slip ring. For example... Figure 4 As shown, a first sliding bearing 310 and a second sliding bearing 320 are disposed between the inner ring 100 and the outer ring 200 of the slip ring, respectively positioned near the end of the fluid slip ring. Therefore, the first sliding bearing 310 and the second sliding bearing 320 are located axially outside the circumferential flow channel. The first sliding bearing 310 and the second sliding bearing 320 can be engaged with the outer ring 200 of the slip ring by a limiting member (e.g., a pin) to prevent the first sliding bearing 310 and the second sliding bearing 320 from moving relative to the outer ring 200.

[0068] Compared with rolling bearings, using sliding bearings can reduce the gap between the inner ring 100 and the outer ring 200 of the slip ring, thereby ensuring that the sealing surface of the first sealing ring 231 fits more tightly with the outer surface of the inner ring 100 of the slip ring, reducing the risk of leakage in the entire system.

[0069] According to an embodiment of this application, an annular end plate 400 is provided at the first end of the fluid slip ring, and the annular end plate 400 is connected to the first end of the inner ring 100 of the slip ring or to the first end of the outer ring 200 of the slip ring. Figure 4 In the example shown, the annular end plate 400 is connected to the first end of the inner ring 100 and protrudes relative to the outer periphery of the inner ring 100. At the second end of the fluid slip ring, a radially outwardly projecting shoulder 115 is provided on the outer periphery of the inner ring 100. In the axial direction of the fluid slip ring, the outer ring 200 is positioned between the annular end plate 400 and the shoulder 115 of the inner ring 100 to ensure positioning between the outer ring 200 and the inner ring 100.

[0070] like Figure 4 As shown in the embodiment of this application, the annular end plate 400 is connected to the inner ring 100 of the slip ring. Specifically, the annular end plate 400 includes an inner ring connecting region and an outer ring limiting region located outside the inner ring connecting region. The inner ring connecting region is detachably connected to the first end of the inner ring 100 of the slip ring via a connector 440. The outer ring limiting region faces the first end of the outer ring 200 of the slip ring, thereby achieving axial limiting of the first sliding bearing 310 and the outer ring 200 of the slip ring.

[0071] like Figure 5 and Figure 6 As shown, oil grooves are formed on the friction surfaces of the first sliding bearing 310 and the second sliding bearing 320, and these grooves can extend circumferentially. By injecting lubricating grease into the oil grooves, an oil film can be formed between the friction surface of the sliding bearing and the inner ring 100 of the slip ring, thereby reducing friction. As an example, a relatively wide oil groove is formed on the friction surfaces of the first sliding bearing 310 and the second sliding bearing 320, and multiple smaller oil grooves can also be formed, making it easier for the entire friction surface to be covered by an oil film. For example, a relatively large annular main oil groove is formed in the middle of the radially inner surface of the first sliding bearing 310 and the second sliding bearing 320, and multiple smaller auxiliary oil grooves are formed on both sides of the main oil groove. An oil injection hole is provided at the corresponding position of the main oil groove. Lubricating grease is injected into the main oil groove through the oil injection hole, and then seeps into the auxiliary oil grooves in sequence, thereby forming a lubricating oil film on the radially inner surface of the sliding bearing and reducing the friction between the sliding bearing and the inner ring of the slip ring. Similarly, a main oil groove and auxiliary oil grooves are also formed on the axial end surface of the second sliding bearing 320. An oil injection hole is provided on the shoulder 115 at the end of the inner ring 100 of the slip ring, corresponding to the position of the main oil groove, through which lubricating oil can be injected.

[0072] like Figure 4 and Figure 6 As shown, according to an embodiment of this application, the fluid slip ring further includes a third sealing ring 330 disposed between the radially outer side of the inner ring 100 and the radially inner side of the outer ring 200. The third sealing ring 330 is disposed between the annular flow channel and the first sliding bearing 310 to prevent liquid in the annular flow channel from leaking to the first sliding bearing 310 and thus avoid affecting the lubrication effect of the first sliding bearing 310.

[0073] As an example, the third sealing ring 330 can be a skeleton sealing ring with the opening facing the annular flow channel, so that the annular groove of the skeleton sealing ring can be used as a liquid reservoir.

[0074] Alternatively, the third sealing ring can be any other type of sealing ring, as long as it is positioned between the annular flow channel and the first sliding bearing and has a reservoir with an opening facing the annular flow channel, which can contain liquid leaking from the annular flow channel to the first sliding bearing, or lubricating fluid leaking from other bearings toward the first sliding bearing.

[0075] Furthermore, the third sealing ring 330 includes an inner ring abutting portion that abuts against the inner ring 100 of the slip ring and an outer ring abutting portion that abuts against the outer ring 200 of the slip ring. An annular tensioning spring 331 is provided in the inner ring abutting portion, so that the inner ring abutting portion can be in close contact with the inner ring 100 of the slip ring to ensure liquid sealing performance.

[0076] A stop rib 334 is provided on the inner surface of the slip ring outer ring 200. The stop rib 334 is located between the circumferential flow channel and the third sealing ring 330. The outer ring abutment portion of the third sealing ring 330 can abut against the stop rib 334, thereby axially limiting the third sealing ring 330. In addition, the stop rib 334 can also prevent liquid leaking from the circumferential flow channel from seeping between the third sealing ring 330 and the slip ring outer ring 200.

[0077] According to an embodiment of this application, the third sealing ring 330 can be disposed adjacent to the first sliding bearing 310, and the first sliding bearing 310 is used to axially limit the third sealing ring 330. Furthermore, since no additional mounting groove for the third sealing ring 330 is required, the installation and removal of the third sealing ring 330 are more convenient.

[0078] To reduce internal friction in the fluid slip ring, lubricating grease needs to be injected between the friction surfaces. However, over time, the lubricating grease ages and hardens, affecting its lubrication performance. Therefore, it is necessary to periodically inject new grease into the lubrication space and replace the old grease. According to an embodiment of this application, a first liquid reservoir 333 is provided between the first sliding bearing 310 and the sealing ring mounting groove on the outer side of the circumferential flow channel. The first liquid reservoir 333 can surround the entire outer circumference of the inner ring 100 of the slip ring. Excess grease and a small amount of cooling medium seeping from the circumferential flow channel can be temporarily stored in the first liquid reservoir 333.

[0079] Furthermore, the third sealing ring 330 is disposed on the axial outer side of the first liquid storage tank 333, thereby being located between the first liquid storage tank 333 and the first sliding bearing 310, to prevent the liquid in the first liquid storage tank 333 from flowing to the first sliding bearing 310, thereby affecting the lubrication effect of the first sliding bearing 310.

[0080] To promptly remove waste grease from the first storage tank 333 or liquid seeping from the annular flow channel, a first discharge hole 335 is provided on the side wall of the outer ring 200 of the slip ring (see reference). Figure 1 and Figure 3 This allows the first liquid storage tank 333 to communicate with the outside through the first drain hole 335, thereby enabling grease discharge and grease addition through the first drain hole 335. Multiple first drain holes 335 can be provided in the circumferential direction of the fluid slip ring.

[0081] like Figure 5 As shown, according to the fluid slip ring of this application, a second liquid reservoir 336 can also be provided between the second sliding bearing 320 and the circumferential flow channel for storing lubricating oil overflowing from the second sliding bearing 320. Correspondingly, at a position corresponding to the second liquid reservoir 336, a second discharge hole 337 is provided on the outer side wall of the slip ring outer ring 200 (see reference). Figure 1 and Figure 3 The fluid slip ring can be grease-discharged or grease-added through the second discharge port 337. Multiple second discharge ports 337 can be provided in the circumferential direction of the fluid slip ring.

[0082] According to the fluid slip ring of this application embodiment, in use, the axial direction of the fluid slip ring can be set approximately vertically. Therefore, excess grease at the first sliding bearing 310 can flow downwards and then outwards from the gap between the first sliding bearing 310 and the annular end plate 400, while excess grease at the second sliding bearing 320 flows downwards into the second liquid storage tank 336 and is discharged outwards through the second discharge hole 337. Furthermore, a small amount of liquid seeping from the circumferential flow channel is stored in the first liquid storage tank 333 and discharged outwards through the first discharge hole 335. In addition, the provision of the third sealing ring 330 effectively prevents liquid seeping from the circumferential flow channel from flowing to the first sliding bearing 310.

[0083] like Figure 7 As shown, the fluid slip ring according to this application has a hollow channel inside, in fluid transportation applications, where cables 600 (e.g., various components such as cables and pipes) can be arranged. Especially for high-flow-rate fluid slip rings, which are relatively large in size, some cables can be run through the hollow channel of the fluid slip ring to make full and effective use of space.

[0084] According to one aspect of this application, a cooling system is provided, the cooling system including a fluid slip ring or fluid slip ring assembly and a fluid delivery unit according to embodiments of this application, the fluid delivery unit being capable of driving fluid to flow through the fluid slip ring to realize fluid delivery at a rotating position.

[0085] According to another aspect of this application, a wind turbine generator set is provided, comprising the aforementioned fluid slip ring, fluid slip ring assembly, or cooling system. The inner ring of the slip ring is connected to a rotating component in the wind turbine generator set, and the outer ring of the slip ring is connected to a fixed component in the wind turbine generator set. As an example, the inner ring 100 of the slip ring is connected to a rotating component in the yaw system of the wind turbine generator set, and the outer ring 200 of the slip ring is connected to a fixed component inside the tower of the wind turbine generator set. A cable is disposed in the tower of the wind turbine generator set, and the cable passes through the inner ring 100 of the slip ring. Since the cable also passes through a spare sealing ring, the need for later use of adhesive bonding technology can be avoided, and the requirement for replacing the entire ring can be met.

[0086] Although specific details of the embodiments of this application have been described in detail with reference to the accompanying drawings, the scope of protection of this application is not limited by the description. Without departing from the principles of this application, those skilled in the art can make corresponding modifications and variations, which will fall within the scope of protection of this application.

Claims

1. A fluid slip ring characterized in that, The fluid slip ring comprises a slip ring inner ring (100) and a slip ring outer ring (200) sleeved on the outer periphery of the slip ring inner ring (100) and capable of rotating relative to the slip ring inner ring (100), and a circumferential flow channel is formed between the slip ring inner ring (100) and the slip ring outer ring (200), one of the slip ring inner ring (100) and the slip ring outer ring (200) is provided with a plurality of axial flow channels extending along the axial direction of the fluid slip ring, the plurality of axial flow channels are distributed at intervals in the circumferential direction of the fluid slip ring, and each of the axial flow channels is in communication with the circumferential flow channel.

2. The fluid slip ring of claim 1, wherein, The axial flow channels comprise at least two first axial flow channels (110) and at least two second axial flow channels (120), the circumferential flow channel comprises a first circumferential flow channel (210) and a second circumferential flow channel (220) spaced apart from each other in the axial direction of the fluid slip ring, the first axial flow channels (110) are in communication with the first circumferential flow channel (210), and the second axial flow channels (120) are in communication with the second circumferential flow channel (220).

3. The fluid slip ring of claim 2, wherein, The slip ring inner ring (100) is in a cylindrical shape, a hollow passage is formed in the interior of the slip ring inner ring (100), the axial flow channels are formed in the cylinder wall of the slip ring inner ring (100), a first through hole (111) is arranged on the radially outer side wall of the first axial flow channel (110) to enable the first axial flow channel (110) to communicate with the first circumferential flow channel (210), a second through hole (121) is arranged on the outer side wall of the second axial flow channel (120) to enable the second axial flow channel (120) to communicate with the second circumferential flow channel (220), at least one first circumferential flow channel inlet and outlet (211) is formed on the outer side wall of the first circumferential flow channel (210) to enable the first circumferential flow channel (210) to communicate with the outside, at least one second circumferential flow channel inlet and outlet (221) is formed on the outer side wall of the second circumferential flow channel (220) to enable the second circumferential flow channel (220) to communicate with the outside, and the first circumferential flow channel inlets and outlets (211) and the second circumferential flow channel inlets and outlets (221) are arranged alternately and uniformly in the circumferential direction of the fluid slip ring.

4. The fluid slip ring of claim 3, wherein, The first circumferential flow channel inlets and outlets (211) are arranged in pairs and oppositely, the second circumferential flow channel inlets and outlets (221) are arranged in pairs and oppositely, and the first circumferential flow channel inlets and outlets (211) and the second circumferential flow channel inlets and outlets (221) are arranged alternately and uniformly in the circumferential direction of the fluid slip ring.

5. A fluid slip ring according to any one of claims 2 to 4, wherein, The fluid slip ring further comprises a first sliding bearing (310) and a third sealing ring (330) arranged between the radially outer side of the slip ring inner ring (100) and the radially inner side of the slip ring outer ring (200), the first sliding bearing (310) is located on one axial side of the circumferential flow channel, the third sealing ring (330) is arranged between the circumferential flow channel and the first sliding bearing (310), and the third sealing ring (330) has a liquid storage groove with an opening facing the circumferential flow channel.

6. The fluid slip ring of claim 5, wherein, A first liquid storage groove (333) is further arranged between the annular flow channel and the third sealing ring (330), and the first liquid storage groove (333) is in communication with the liquid storage groove of the third sealing ring. The first discharge hole (335) is arranged at a position corresponding to the first liquid storage groove (333) of the outer ring (200) to communicate the first liquid storage groove (333) with the outside.

7. The fluid slip ring of claim 6, wherein, The third sealing ring (330) comprises an inner ring abutting portion abutting against the inner ring (100) and an outer ring abutting portion abutting against the outer ring (200). The annular tightening spring (331) is arranged in the inner ring abutting portion, so that the inner ring abutting portion is in close contact with the inner ring (100).

8. The fluid slip ring of claim 7, wherein, The inner surface of the outer ring (200) is provided with a stop rib (334) located between the first liquid storage groove (333) and the third sealing ring (330). The outer ring abutting portion of the third sealing ring (330) abuts against the stop rib (334).

9. The fluid slip ring of claim 5, wherein, The inner surface of the outer ring (200) or the outer surface of the inner ring (100) is formed with a sealing ring mounting groove (230). The first sealing ring (231) is mounted in the sealing ring mounting groove (230). The first sealing ring (231) faces the friction surface on one side of the groove opening of the sealing ring mounting groove (230).

10. The fluid slip ring of claim 9, wherein, The radially inner side surface of the outer ring (200) is concave to form the annular flow channel. The first sealing ring (231) is located on both axial sides of the annular flow channel. At least one circle of the first sealing ring (231) is arranged on each axial side of the annular flow channel.

11. The fluid slip ring of claim 5, wherein, The fluid rotary joint further comprises an annular end plate (400) connected to the first end of the inner ring (100) and protruding relative to the outer periphery of the inner ring (100). The second end of the inner ring (100) is provided with a shaft shoulder (115) protruding relative to the outer periphery of the inner ring (100). In the axial direction of the fluid rotary joint, the outer ring (200) is limited between the shaft shoulder (115) and the annular end plate (400). The second sliding bearing (320) is further arranged between the inner ring (100) and the outer ring (200). The first sliding bearing (310) is located between the annular flow channel and the annular end plate (400), and the second sliding bearing (320) is located between the annular flow channel and the shaft shoulder (115).

12. The fluid slip ring of claim 11, wherein, The main oil groove and the plurality of auxiliary oil grooves located on both sides of the main oil groove are formed on the friction surfaces of the first sliding bearing (310) and the second sliding bearing (320). The width of the main oil groove is greater than the width of the auxiliary oil groove. By injecting lubricating grease into the main oil groove, a lubricating oil film can be formed on the friction surface.

13. A cooling system characterized by, The cooling system comprises the fluid rotary joint according to any one of claims 1-12 and a fluid conveying unit capable of driving fluid to flow through the fluid rotary joint.

14. A wind power unit, characterized in that The wind turbine generator set includes the cooling system of claim 13, the inner slip ring ring being connected to a rotating component in the wind turbine generator set, and the outer slip ring ring being connected to a stationary component in the wind turbine generator set.

15. A wind power plant according to claim 14, characterised in that The inner slip ring ring is connected to a rotating component in a yaw system of the wind turbine generator set, and the outer slip ring ring is connected to a stationary component inside a tower of the wind turbine generator set.

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