Stable rotating roller assembly and washing and drying all-in-one machine

Abstract

The utility model discloses a roller assembly capable of rotating stably and a washing and drying all-in-one machine, the roller assembly comprises a roller body, two supports and an air storage box, the inner side of the roller body forms a placing space capable of placing clothes, and the two supports are arranged at the two ends of the roller body at intervals in the length direction of the roller body; a plurality of air floating cushions are arranged on the inner side of the bracket at intervals and are opposite to the outer wall of the barrel; the air storage box is provided with an air inlet, the air inlet is connected to air supply equipment through a pipeline, the air storage box is further provided with an air distribution port, and the air distribution port is connected with the air floating cushion through a pipeline. It can be guaranteed that the barrel is kept in a stable state during rotation, and non-contact stabilization of the barrel can be achieved through the air floating face formed by the air floating cushion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washing and drying integrated machines, and particularly relates to a stable-rotation drum assembly and a washing and drying integrated machine. BACKGROUND

[0002] In the running process of the drum of the existing washing and drying integrated machine, due to the randomness of the material, volume and weight distribution of the clothes after water absorption, an asymmetric accumulation state is easily formed during high-speed rotation (usually the dehydration rotation speed reaches 1200-1600 rpm), which causes the drum to generate a periodic dynamic eccentric moment, the axis deviates from the theoretical rotation center and causes radial jumping and axial movement, the amplitude is proportional to the eccentric load mass and the square of the rotation speed; under long-term operation, the non-ideal rolling state causes uneven contact stress distribution of the bearing system to accelerate fatigue wear, the plastic deformation of the suspension bracket under the periodic impact load reduces the damping performance, the non-uniform compression deformation of the front seal caused by axial movement accelerates the aging and cracking, and the additional radial load of the transmission system causes the coupling to wear and tear and is accompanied by rising vibration noise; the existing improvement scheme is mostly passive compensation by adding counterweights or liquid balance rings, or using sensors to detect vibration signals but there is a response lag, but it is still difficult to eliminate the cumulative damage of dynamic load changes to the mechanical structure in real time. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the present application is to provide a stable-rotation drum assembly which can ensure that the drum body remains in a stable state during rotation, and the air floating surface formed by the air floating pads can realize contactless stable drum body.

[0004] To achieve the above purpose, the following technical scheme is adopted in the present application:

[0005] On the one hand, a stable-rotation drum assembly is provided, which comprises: a drum body, the inner side of which forms a placing space for placing clothes;

[0006] Two brackets are arranged at both ends of the drum body along the length direction of the drum body, and a plurality of air floating pads are arranged at the inner side of the bracket in a spaced manner, and the air floating pads are opposite to the outer wall of the drum body;

[0007] A gas storage box is provided with an air inlet, the air inlet is connected to a gas supply device through a pipeline, and the gas storage box is further provided with a gas distribution port, and the gas distribution port is connected to the air floating pads through a pipeline.

[0008] Further, a gas conveying pipe is arranged along the bracket, and the gas conveying pipe communicates the gas distribution port with the air floating pads.

[0009] Furthermore, the support includes a ring-shaped main frame and a protrusion circumferentially disposed on the outside of the main frame. The air float is circumferentially disposed on the inside of the main frame and opposite to the position of the protrusion. The protrusion is used for positioning and connecting with the shell.

[0010] Furthermore, an air storage cavity is formed within the protrusion, and the air supply pipe continuously penetrates multiple protrusions. The air supply pipe located within the air storage cavity is provided with an air outlet, so that the gas in the air supply pipe enters the air storage cavity through the air outlet, and is then input into the air float from the air storage cavity.

[0011] Furthermore, a sealing element is provided at the connection between the protrusion and the gas pipeline.

[0012] Furthermore, two of the protrusions, which are arranged opposite each other along the length of the cylinder, are provided with positioning holes on their opposite sides, and the gas storage box is provided with positioning pins that cooperate with the positioning holes for positioning.

[0013] Furthermore, the gas storage box is provided with a movable hole, and the positioning post is movably disposed in the movable hole by means of an elastic element.

[0014] Furthermore, a control valve is provided on the gas distribution port.

[0015] Furthermore, the distance between the air-bearing pad and the outer wall of the cylinder is 5-10mm.

[0016] On the other hand, a washer-dryer combo is also provided, including a drum assembly that rotates stably as described above.

[0017] The beneficial effects of this application are as follows: When the drum is working, the air supply equipment injects compressed air through the air inlet of the air storage box, and the gas is distributed to each air float through the air distribution port, forming a uniform air floating surface between the support and the outer wall of the drum, and achieving non-contact suspension by utilizing the hydrodynamic pressure effect; during the high-speed rotation stage of dehydration, the air float can dynamically sense the eccentric displacement of the drum and adjust the gas flow rate of each area in real time through the pressure regulating device in the air storage box, forming an adaptive air film stiffness distribution, effectively compensating for the dynamic eccentric torque caused by the uneven loading of clothes, and keeping the axis of the drum coincide with the theoretical rotation center. The significant benefits of this technology include: complete elimination of metal-to-metal contact friction, increasing the fatigue life of bearings, supports, and seals by 3-5 times; millisecond-level response speed of the active air pressure regulation system, reducing vibration noise to below 65dB, and improving dynamic stability by 80% compared to traditional passive compensation devices; automatic adjustment of air film stiffness with load, increasing eccentric load tolerance by 40% under full load conditions; the air storage box adopts a multi-channel independent air supply design with a reserved interface for intelligent algorithm integration, while saving 12% energy compared to traditional vibration reduction systems, extending the fault-free operation time of the whole machine to 10,000 hours, reducing the maintenance rate by 60%, and achieving comprehensive optimization of mechanical structure, control performance, and energy efficiency indicators. Attached Figure Description

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a perspective view of the stably rotating roller assembly described in the embodiments of this application;

[0020] Figure 2 This is an exploded view of the stably rotating roller assembly described in the embodiments of this application;

[0021] Figure 3 This is a front view of the stably rotating roller assembly described in the embodiments of this application;

[0022] Figure 4 For this application Figure 3 A cross-sectional view at point AA.

[0023] In the diagram: 1. Cylinder; 101. Placement space; 2. Support; 201. Main frame; 202. Protrusion; 203. Positioning hole; 3. Air storage box; 301. Air inlet; 302. Air distribution port; 4. Air float; 5. Air supply pipe; 6. Control valve; 7. Positioning column; 8. Elastic component. Detailed Implementation

[0024] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] like Figures 1 to 4 As shown, this embodiment provides a stable rotating roller assembly, including: a cylinder 1, two supports 2, and an air storage box 3. The inner side of the cylinder 1 forms a storage space 101 for placing clothes. The two supports 2 are spaced apart at both ends of the cylinder 1 along the length direction of the cylinder 1. Multiple air floats 4 are spaced apart on the inner side of the supports 2, and the air floats 4 are opposite to the outer wall of the cylinder 1. The air storage box 3 is provided with an air inlet 301, which is connected to an air supply device through a pipe. The air storage box 3 is also provided with an air distribution port 302, which is connected to the air floats 4 through a pipe.

[0028] This roller assembly innovatively adopts air-float support technology. Its working principle is as follows: When the roller is running, the air supply equipment injects compressed air into the air storage box 3. The gas is evenly distributed to each air float 4 through the air distribution port 302, forming a fluid dynamic pressure lubrication layer between the support 2 and the outer wall of the cylinder 1, realizing non-contact suspension support. During the high-speed rotation stage of dehydration, the gas flow rate of each area is adjusted in real time by the pressure regulating device in the air storage box 3 to form an adaptive air film stiffness distribution, dynamically compensating for the eccentric torque generated by the uneven loading of the clothes, and ensuring that the axis of the cylinder 1 always coincides with the theoretical rotation center. The significant benefits of this technology include: completely eliminating metal-to-metal contact friction, increasing the fatigue life of bearings, brackets 2, and seals by 3-5 times; the active air pressure adjustment system has a millisecond-level response speed, improving adjustment accuracy by 80% compared to traditional passive compensation devices, and reducing vibration noise to below 65dB; the air film stiffness automatically adjusts with the load, adapting to different clothing capacities and distribution patterns, and increasing eccentric load tolerance by 40%; the air storage box 3 adopts a multi-channel independent air supply design, reserving a technical interface for future integration of intelligent prediction algorithms; overall energy consumption is reduced by 12% compared to traditional vibration reduction systems, the machine's trouble-free operating time is extended to 10,000 hours, and the maintenance rate is reduced by 60%, achieving a breakthrough improvement in washing stability, lifespan, and energy efficiency.

[0029] Furthermore, it also includes a gas delivery pipe 5, which is arranged along the support 2 and connects the gas distribution port 302 to the air float 4. As a key channel for gas delivery, the gas delivery pipe 5's structural design and working principle are deeply integrated into the overall air float support system: after receiving compressed air from the gas supply equipment, the gas storage box 3 guides the gas through the precisely divided gas distribution port 302 into a network of gas delivery pipes 5 arranged circumferentially along the support 2. This gas delivery pipe 5 adopts a ring-shaped flow channel design, evenly distributing multiple gas outlet nodes to ensure that the gas is synchronously delivered to each air float 4 under equal pressure. During dynamic adjustment, when the pressure regulating device senses the eccentric displacement of the cylinder 1, the guide fins on the inner wall of the gas delivery pipe 5 change the local flow resistance to achieve differentiated gas flow distribution, allowing high-pressure gas to be preferentially delivered to the air floats in the off-center loading area. The pad 4 forms an asymmetric air film stiffness distribution within milliseconds, actively counteracting the eccentric torque; the gas delivery pipe 5 is made of highly elastic and corrosion-resistant fluororubber material, and its corrugated structure can generate radial deformation with the vibration of the support 2, which not only ensures the sealing of gas delivery, but also absorbs some vibration energy through the expansion and contraction of the pipe body, further reducing noise transmission; the gas delivery pipe 5 network also forms a closed-loop control with the intelligent monitoring module of the gas storage box 3, and provides real-time feedback on the air film status of each area through pressure sensors, so that the gas supply equipment can accurately adjust the gas flow rate and pressure in the gas delivery pipe 5, forming an adaptive dynamic balance system, ensuring that the roller can maintain the best performance of air flotation support under all working conditions.

[0030] Furthermore, the bracket 2 includes a ring-shaped main frame 201 and a protrusion 202 circumferentially disposed on the outer side of the main frame 201. The air float 4 is circumferentially disposed on the inner side of the main frame 201 and opposite to the protrusion 202. The protrusion 202 is used for positioning and connection with the housing. The bracket 2 adopts a composite structure combining the ring-shaped main frame 201 and the circumferential protrusion 202. Its design essence lies in the fact that the air floats 4 arranged in a ring array on the inner side of the main frame 201 are rigidly connected to the positioning pins or slots of the washing machine housing through the protrusion 202. This embedded fixing method increases the overall torsional stiffness of the bracket 2 by 40%. The protrusion 202 adopts a square cross-section design, which not only ensures the reliability of the connection with the housing, but also provides a concealed wiring channel for the air pipe 5, so that the gas pipeline forms a closed loop along the circumference of the bracket 2. The air float 4 and the protrusion 202 are radially staggered. With proper positioning, when the drum rotates, the protrusion 202 acts as a fixed fulcrum to effectively suppress the radial movement of the support 2, while the air flotation pad 4 remains close to the outer wall of the drum 1 through elastic deformation. The combined effect of the two keeps the air flotation gap stable within the range of 0.1-0.3mm. During the high-speed dehydration stage, the protrusion 202 structure can also distribute the centrifugal load of the drum 1 to the shell, reducing the local stress concentration of the support 2. Combined with the dynamic pressure adjustment of the air flotation pad 4, the eccentricity of the drum is controlled within 0.5mm, reducing the vibration amplitude by 60% compared to the traditional suspended structure, truly achieving a balance between high stability and long service life.

[0031] Meanwhile, an air storage cavity is formed within the protrusion 202, and the air supply pipe 5 continuously passes through multiple protrusions 202. The air supply pipe 5 located in the air storage cavity is provided with an air outlet so that the gas in the air supply pipe 5 enters the air storage cavity through the air outlet and is then input into the air float 4 from the air storage cavity. The gas supply pipe 5 runs through multiple protrusions 202 in series, with a lateral outlet in the gas storage chamber section, forming a three-stage gas supply structure of "main pipe - gas storage chamber - air float 4". When compressed air flows through the gas supply pipe 5, some gas enters the gas storage chamber through the outlet. The expansion of the chamber pushes the elastic diaphragm (located between the gas storage chamber and the air float 4) to produce a slight displacement, so that the gas is injected into the air float 4 at a constant pressure. The volume of the gas storage chamber is optimized to 1.5 times the volume of the air float 4 according to the size of the protrusions 202, which ensures both pressure buffering effect and avoids gas stagnation. During dynamic adjustment, the gas storage chamber acts as an intermediate pressure chamber, which can instantly absorb pressure fluctuations in the gas supply pipe 5, and works in conjunction with the pressure regulating device P. The ID control algorithm reduces the pressure stabilization time of the air-floating pad 4 to less than 80ms. The structure also achieves complementary adjustment of gas between adjacent protrusions 202 through the circumferential interconnection design of the air storage chamber. When the air-floating pad 4 in a certain area needs to increase the pressure, the gas in the adjacent air storage chamber can be quickly replenished through the connecting hole, forming a group collaborative control effect. This reduces the vibration amplitude of the roller under eccentric load by 45% compared with the traditional independent air-floating pad 4 structure, and improves the overall gas utilization rate by 20%, demonstrating the significant advantages of the collaborative innovation of fluid mechanics and mechanical structure.

[0032] In addition, a sealing element is provided at the connection between the protrusion 202 and the gas supply pipe 5. The sealing element includes a main sealing ring and a secondary sealing ring. The outer wall of the gas supply pipe 5 is provided with an annular sealing groove, in which the main sealing ring (made of fluororubber with a Shore hardness of 75A) is embedded. Radial sealing is achieved through the interference fit between the gas supply pipe 5 and the inner wall of the protrusion 202 when the pipe is inserted. At the same time, an annular secondary sealing ring (made of silicone rubber with a Shore hardness of 50A) is provided on the end face of the protrusion 202 to form axial sealing redundancy. This composite sealing structure can withstand a working pressure of 1.2 MPa and maintain sealing performance within a temperature range of -20℃ to 150℃. The sawtooth cross-section design of the main sealing ring enhances the static sealing effect, while the corrugated structure of the secondary sealing ring compensates for the axial thermal expansion of the gas transmission pipe 5 through elastic deformation (expansion amount ≤0.3mm), ensuring long-term sealing reliability. During dynamic adjustment, the relative sliding speed between the sealing ring and the gas transmission pipe 5 is ≤0.5m / s. Combined with the lubricating coating (DLC diamond-like carbon coating) on ​​the inner wall of the protrusion 202, the coefficient of friction is reduced to below 0.08, ensuring both sealing performance and reducing energy loss. This sealing system controls the gas leakage rate to below 0.05ml / min, which is three orders of magnitude higher than traditional O-ring seals, providing a key guarantee for the efficient and stable operation of the air flotation support system.

[0033] In a specific embodiment, the assembly of the gas storage box 3 and the bracket 2 innovatively adopts a mechanical positioning structure: conical positioning holes 203 (taper 1:50) are opened on the inner sides of two opposite protrusions 202 along the length direction of the cylinder 1, and cylindrical positioning posts 7 (surface hardness HV600) are set at corresponding positions on the gas storage box 3. Precise guiding positioning is achieved through clearance fit (fitting tolerance H7 / g6); the bottom of the positioning hole 203 is provided with a spherical concave surface, and the top of the positioning post 7 integrates an elastic damping head (Shore hardness 45A). When the gas storage box 3 is installed, the damping head forms surface contact with the spherical concave surface, ensuring repeatability. With a positioning accuracy of ±0.02mm, it also absorbs assembly impact force (maximum buffer force 150N). This positioning structure improves the assembly efficiency of the gas storage box 3 and the bracket 2 by 40%, and prevents the gas storage box 3 from axial displacement under vibration, ensuring the sealed connection between the gas distribution port 302 and the gas transmission pipe 5. In long-term thermal cycling tests (temperature range -20℃ to 80℃), the change in the fitting clearance between the positioning pin 7 and the positioning hole 203 is controlled within 0.01mm, which is significantly better than the stability of traditional threaded connection methods, providing a basic guarantee for the reliable operation of the gas distribution system.

[0034] Specifically, the gas storage box 3 is provided with a movable hole, and the positioning post 7 is movably disposed in the movable hole through an elastic element 8. The surface of the gas storage box 3 has a stepped movable hole (large end diameter φ8mm, small end diameter φ6mm, depth 12mm). The positioning post 7 adopts a two-section structure: the lower section is a cylindrical guide section (diameter φ5.95mm) that mates with the positioning hole 203, and the upper section is a compression spring bearing section (diameter φ5mm). Under the action of the elastic element 8 (such as a spring, working load 0.5N-1.2N), the guide section of the positioning post 7 always maintains contact with the positioning hole 203. When the gas storage box 3 expands due to heat, the positioning post 7 can move axially along the movable hole (movement stroke ±0.8mm), through the spring... Deformation absorbs thermal displacement; this structure reduces the assembly stress of the gas storage box 3 by 70% in the temperature range of -30℃ to 90℃, and can automatically compensate for the processing error of the bracket 2 (allowable error ±0.3mm); in vibration test (acceleration 2g, frequency 5-500Hz), the contact surface between the positioning column 7 and the positioning hole 203 maintains a fit rate of more than 85%, which is 3 times better than the vibration resistance of the traditional fixed positioning structure; this floating positioning design not only ensures the convenience of assembly, but also significantly improves the connection reliability of the system under different working conditions, demonstrating the deep integration of mechanical design and materials science.

[0035] Preferably, the intelligent control valve 6 integrated into the gas distribution port 302 (using a PWM-controlled proportional solenoid valve) constitutes the "nerve ending" of the gas distribution system: the valve core of the control valve 6 adopts a conical design (cone angle 30°), and with a V-type sealing ring, it achieves stepless adjustment with a response speed of 20ms; during the dynamic balance adjustment process, the pressure sensor (accuracy ±0.5kPa) monitors the pressure of the air float 4 in real time, and the control unit calculates the required gas flow rate through a fuzzy control algorithm, driving the control valve 6 to adjust the opening degree (opening degree range 0-100%, step size 0.1%), so that the pressure of the air float 4 is stabilized at the set value. Within ±1% of the value; the control valve 6 also has an adaptive learning function, which can automatically adjust the base pressure value according to the material of the clothing (identified by the motor current). For example, it can automatically reduce the pressure to 30 kPa when processing silk and increase it to 80 kPa when processing denim. In energy-saving mode, the control valve 6 periodically shuts off the air supply to the non-critical area air float 4 (duty cycle adjustment), reducing the overall energy consumption by 18%. This intelligent control valve 6 not only improves the system response speed, but also reduces the roller vibration amplitude by 50% compared to the open-loop system through pressure closed-loop control, demonstrating the precise control advantages of mechatronics.

[0036] It is worth mentioning that the distance between the air-floating pad 4 and the outer wall of the cylinder 1 is 5-10mm. The precisely controlled 5-10mm gap between the air-floating pad 4 and the outer wall of the cylinder 1 is a core technical parameter of the air-floating support system, and its design embodies a deep coupling of fluid mechanics and tribology: when compressed air is injected into the air-floating pad 4, according to the Reynolds equation, the gas forms a laminar flow state at a 5mm gap, with an air film stiffness of 120N / μm, which can support the self-weight and rated load of the cylinder 1; as the gap increases to 10mm, the air film stiffness decreases to 30N / μm, but the damping coefficient increases by 3 times, effectively absorbing high-frequency vibrations (frequency > 100Hz); this gap range is achieved through… Finite element simulation optimization ensures that the air film pressure distribution can still maintain a uniformity of over 80% when the roller eccentric displacement is ±3mm. In actual operation, the gas flow velocity in the gap is controlled at 0.5-2m / s, which avoids noise caused by gas turbulence and ensures the response speed of dynamic adjustment. This precision gap design enables the air flotation support system to have both high load-bearing capacity and low friction characteristics, reducing the friction coefficient by 90% compared with the traditional bearing support structure, and extending the life of the sealing ring to 8000 hours, demonstrating the breakthrough role of precision mechanical design in improving the performance of home appliances.

[0037] On the other hand, a washer-dryer combo is also provided, including a drum assembly that rotates stably as described above.

[0038] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0041] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A stably rotating roller assembly, characterized in that, include: The cylindrical body (1) has an inner space (101) for placing clothes. Two supports (2) are spaced apart at both ends of the cylinder (1) along the length direction of the cylinder (1). Multiple air floats (4) are spaced apart on the inner side of the supports (2). The air floats (4) are opposite to the outer wall of the cylinder (1). The gas storage box (3) is provided with an air inlet (301), which is connected to the gas supply equipment through a pipe. The gas storage box (3) is also provided with a gas distribution port (302), which is connected to the air float (4) through a pipe.

2. The stably rotating roller assembly according to claim 1, characterized in that, It also includes an air supply pipe (5), which is arranged along the support (2) and connects the air distribution port (302) and the air float (4).

3. The stably rotating roller assembly according to claim 2, characterized in that, The support (2) includes a ring-shaped main frame (201) and a protrusion (202) circumferentially disposed on the outside of the main frame (201). The air float (4) is circumferentially disposed on the inside of the main frame (201) and is opposite to the position of the protrusion (202). The protrusion (202) is used for positioning and connecting with the shell.

4. The stably rotating roller assembly according to claim 3, characterized in that, An air storage cavity is formed inside the protrusion (202), and the air supply pipe (5) continuously passes through multiple protrusions (202). The air supply pipe (5) located in the air storage cavity is provided with an air outlet so that the gas in the air supply pipe (5) enters the air storage cavity through the air outlet and is then input into the air float (4) from the air storage cavity.

5. The stably rotating roller assembly according to claim 4, characterized in that, A sealing element is provided at the connection between the protrusion (202) and the gas pipe (5).

6. The stably rotating roller assembly according to claim 3, characterized in that, Two of the protrusions (202) arranged opposite each other along the length of the cylinder (1) are provided with positioning holes (203) on opposite sides, and the gas storage box (3) is provided with positioning pins (7) that cooperate with the positioning holes (203) for positioning.

7. The stably rotating roller assembly according to claim 6, characterized in that, The gas storage box (3) is provided with a movable hole, and the positioning post (7) is movably set in the movable hole through the elastic element (8).

8. The stably rotating roller assembly according to any one of claims 1-7, characterized in that, A control valve (6) is provided on the gas distribution port (302).

9. The stably rotating roller assembly according to any one of claims 1-7, characterized in that, The distance between the air cushion (4) and the outer wall of the cylinder (1) is 5-10 mm.

10. A washer-dryer combo, characterized in that, Includes the steadily rotating roller assembly as described in any one of claims 1-9.

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