Novel pneumatic motor

Abstract

The embodiment of the utility model provides a novel pneumatic motor, and relates to the field of vane type motors. The novel pneumatic motor comprises a front end cover, a cylinder body, an outer barrel, a rotor, blades, a rear end cover and a stator, air holes are formed in the front end cover and the rear end cover, the air holes are communicated with the cavity to form an unfolding air channel, and the stator comprises a cylinder body and an outer barrel; the cylinder body is provided with an air inlet channel and an air outlet channel. The side face of the cylinder body can be provided with an auxiliary air inlet channel and an auxiliary air outlet channel. The motor is internally provided with the two-way unfolding air channel capable of controlling the blades to move, the unfolding function can be achieved through positive and negative rotation, the structure is simple, and the manufacturing and mounting scheme is achieved; compressed air acts on the inner sides of the blades through the air channels, it is guaranteed that the blades can be effectively attached to the cylinder body, the problems that starting is slow and normal starting cannot be achieved only through the structure of centrifugal unfolding of the blades are effectively solved, the auxiliary air inlet channels can effectively reduce resistance loss, and the torque of the motor is effectively improved under the same condition.

Description

Technical Field

[0001] This invention relates to the field of blade motors, specifically to a novel pneumatic motor. Background Technology

[0002] A pneumatic motor is a device that converts the pressure energy of compressed air into rotational mechanical energy. It is generally used as a rotational power source for more complex devices or machines. Due to its compact structure and automatic compensation for blade wear, vane-type pneumatic motors are widely used in the industry. During the operation of a pneumatic motor, the blades constantly rub against each other inside the cylinder, causing wear on the blade end faces. Blade wear reduces the tightness of the connection between the blades and the rotor. Pneumatic motors that use spring-loaded blade deployment will experience a decrease in working efficiency and an increase in vibration and noise due to the reduced elastic deployment force after blade wear, thus reducing the service life of the pneumatic motor.

[0003] Traditional vane motors rely on elastic components to unfold the vanes or on centrifugal force during vane rotation alone. Due to their working principle, these elastic components have greater elasticity under compression, but their unfolding force is much smaller when the vanes unfold. As a result, when the vanes are not under centrifugal force during startup, the traditional elastic vane unfolding structure has a slow startup response. Furthermore, because the motor operates at high speed, the elastic components are constantly changing, which affects the lifespan of motors that use elastic components to unfold the vanes. On the other hand, traditional pneumatic motors that rely solely on centrifugal force to unfold the vanes may have the vanes retracted into the rotor slots, failing to effectively adhere to the cylinder wall. This can lead to failure to start or low starting torque, making it impossible to start under load.

[0004] For example, in the prior art, a novel five-blade forward and reverse pneumatic motor with authorization announcement number CN213016778U uses spring-loaded blade deployment. "Each of the five blade slots has a blade, and the top of the blade has a roller. When the blade rotates, the outer wall of the roller abuts against the inner wall of the air chamber under the action of the spring and rotates on its own." Its blade deployment is an elastic deployment structure. Therefore, during use, the elastic element is prone to damage due to fatigue, leading to motor failure. Thus, a pneumatic motor that can start quickly and has a longer service life is needed to solve the above problems. Summary of the Invention

[0005] According to an embodiment of the present invention, a novel pneumatic motor is provided to solve the problems mentioned in the background art.

[0006] In a first aspect of the invention, a novel pneumatic motor is provided.

[0007] The novel pneumatic motor includes: a front end cover, a cylinder, an outer cylinder, a rotor, blades, a rear end cover, and a stator; the stator is connected between the rear end cover and the front end cover, and the stator, the front end cover, and the rear end cover form a cavity to accommodate the rotor, the rotor is disposed in the cavity, and the blades are connected to the rotor;

[0008] Both the front end cover and the rear end cover are provided with air holes, which are connected to the cavity to form an expansion air passage. The rotor is rotatably connected to the rear end cover through a bearing.

[0009] The stator includes a cylinder and an outer cylinder; an intake channel and an exhaust channel are formed between the outer cylinder and the cylinder, and a plurality of exhaust holes are provided on the side wall of the outer cylinder, which are connected to the exhaust channel;

[0010] The cylinder block is provided with an air intake passage and an exhaust passage; the side of the cylinder block may be provided with an auxiliary air intake passage and an auxiliary exhaust passage.

[0011] Preferably, a sealing element is provided at the connection between the outer cylinder, the front end cover, and the rear end cover. The sealing element is a rubber sealing ring, a sealing gasket, or a sealant.

[0012] Preferably, the vent is connected to an extended air passage, which is located on the inner wall of the front end cover and the rear end cover, and the extended air passage is connected to an exhaust port.

[0013] Preferably, the stator further includes a motor housing, on which an air inlet and an exhaust outlet are provided, and the cylinder is located inside the motor housing.

[0014] Preferably, the outer cylinder is provided with an external exhaust port.

[0015] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0016] This invention provides a novel pneumatic motor with an internal unfolding air passage for controlling blade movement. When the motor starts, compressed air acts on the inner side of the blades through the air passage, ensuring that the blades can effectively adhere to the cylinder body. Through the action of air pressure, the adhesion force can be stabilized, effectively solving the problems of slow start-up and failure to start normally in structures that rely solely on centrifugal unfolding of blades. It is more stable and reliable than pneumatic motors that use elastic structures to unfold blades, reducing fatigue failure caused by repeated deformation of elastic elements, and reducing resistance when the blades retract inward, thereby improving working efficiency.

[0017] In addition, it can be connected to a speed reducer, and its compact structure can meet the needs of high torque applications.

[0018] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0019] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0020] Figure 1 An exploded structural schematic diagram of a novel pneumatic motor according to an embodiment of the present invention is shown;

[0021] Figure 2 A cross-sectional structural schematic diagram of the cylinder of a novel pneumatic motor according to an embodiment of the present invention is shown;

[0022] Figure 3 A three-dimensional structural schematic diagram of the front end cover of the cylinder of a novel pneumatic motor according to an embodiment of the present invention is shown;

[0023] Figure 4 A three-dimensional structural schematic diagram of the rear end cover of the cylinder of a novel pneumatic motor according to an embodiment of the present invention is shown.

[0024] The attached figures are labeled as follows:

[0025] 1-Front cover, 2-Bearing, 3-Front end cover, 4-Seal, 5-Outer cylinder, 6-Rotor, 7-Blade, 8-Cylinder block, 9-Rear end cover, 10-Rear end cover, 11-Auxiliary intake duct, 12-Expanding air duct, 13-Connecting air duct, 14-Intake port, 15-External exhaust port, 16-Intake duct, 17-Internal exhaust port, 18-Exhaust port, 19-Extended air duct, 20-Exhaust duct. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0028] like Figures 1 to 4 As shown, the present invention provides a novel pneumatic motor, comprising a front cover 3, a cylinder 8, an outer cylinder 5, a rotor 6, blades 7, a rear cover 9, and a stator. The stator is disposed between the front cover 3 and the rear cover 9, and its interior, together with the front cover 3 and the rear cover 9, forms a cavity for accommodating the rotor 6. The rotor 6 is disposed within the cavity, and the blades 7 are movably connected to the rotor 6.

[0029] Both the front cover 3 and the rear cover 9 are provided with air holes, which are connected to the cavity to form an unfolding air passage 12. The rotor 6 is rotatably connected to the rear cover 9 through the bearing 2.

[0030] The stator includes a cylinder block 8 and an outer cylinder 5, which form an intake passage and an exhaust passage. The outer cylinder 5 has multiple exhaust holes on its side wall, which are connected to the exhaust passage. The cylinder block 8 is provided with an intake passage 16 and an exhaust passage 20, and its side may also be provided with an auxiliary intake passage and an auxiliary exhaust passage.

[0031] In one embodiment, a sealing element 4 is provided at the connection between the outer cylinder 5 and the front end cover 3 and the rear end cover 9. The sealing element can be a rubber sealing ring, sealing gasket or sealing adhesive, used to enhance airtightness.

[0032] In another embodiment, the vent is connected to the extended air passage 19, which is located on the inner wall of the front cover 3 and the rear cover 9 and is connected to the exhaust port 18.

[0033] The stator may also include a motor housing, on which an air inlet 14 and an exhaust port 18 are provided, and the cylinder 8 is placed inside the motor housing. The outer cylinder 5 is provided with an external exhaust port 15 for discharging compressed air.

[0034] In the novel pneumatic motor structure of this invention, a cylinder 8 is provided inside the outer cylinder 5, and a front end cover 3 and a rear end cover 9 are fixedly connected to the outer cylinder 5 and the cylinder 8. The cylinder 8 is positioned and connected to the front end cover 3 and the rear end cover 9 by positioning pins, thereby forming a sealed space inside the cylinder 8. A rotor 6 is installed in this sealed space, and its two ends are respectively mounted on the front end cover 3 and the rear end cover 9 by front bearings and rear bearings, allowing the rotor 6 to rotate under control.

[0035] The rotor 6 is connected to blades 7, with no fewer than two blades. When there are two blades, they are arranged symmetrically around the central axis of the rotor; when the number of blades increases, they are distributed in an array along the central axis of the rotor. When the motor starts, the blades 7 are in close contact with the inner wall of the cylinder 8, dividing the inner cavity into multiple spaces; when it stops, the blades 7 separate from the inner wall of the cylinder, thus the blades 7 and the rotor 6 are movably connected.

[0036] The rotor 6 has slots on its circumference corresponding to the number of blades. The slots extend along the rotor axis and have an open structure. The portion of the blades 7 closest to the rotor is placed in the slots and can move radially along the rotor. When the rotor is in the power-operating section, the blades 7 move away from the rotor's central axis; after leaving the power-operating section, the blades 7 return to their slots.

[0037] The side of blade 7 closest to the rotor center can be an arc or inclined surface, while the side furthest from the center is a straight curved surface. The arc surface does not completely fit the bottom surface of the placement slot. After compressed air enters the cylinder 8, it acts on the arc surface of blade 7 through the unfolded air passage 12, thereby pushing it to move radially to fit against the inner wall of the cylinder. When the blade rotates to retract inward, the other unfolded air passage connects to the exhaust port to directly discharge the compressed air inside the blade, thereby reducing the resistance when the blade retracts inward.

[0038] A recessed area is provided on the outer wall of the cylinder body 8. When installed inside the outer cylinder of the motor, this recessed area forms an air intake space between itself and the inner wall of the outer cylinder. Multiple auxiliary air intake passages 11 are provided on the bottom surface of the recess. Air intake passages 16 and exhaust passages 20 are provided on the upper and lower end faces of the cylinder body 8, and these can be interchanged according to the motor's forward and reverse rotation function. The air intake passage 16 connects to an extension air passage 19 located within the cylinder body wall. The extension air passage is arranged along the cylinder body axial direction. Both the front end cover 3 and the rear end cover 9 are provided with expansion air passages 12, which communicate with the air intake passage 16 and the extension air passage 19, respectively.

[0039] Compressed air enters the extension duct 19 through the inlet 14, then sequentially enters the expansion duct 12, and finally enters the space between the rotor slot and the inner side of the blade. As the compressed air fills the sealed space, it acts on the curved surface of the blade, causing the blade to move radially outward. When the blade retracts inward, the gas enters the extension duct 19 through the expansion duct 12 and is finally discharged through the exhaust port 18.

[0040] The front end of the motor outer cylinder 5 is connected to the front end component. The outer cylinder 5, together with the rear end cover 9, cylinder 8, front end cover 3, and front end component, constitute the stator. The front end of the outer cylinder 5 is open, and the rear end is closed. The front end cover 3 is fitted into the front end opening. An external exhaust port 15 is provided on the outer cylinder 5.

[0041] Depending on the application requirements, the air duct 12 can be optionally mounted on either the front cover 3 or the rear cover 9, without needing to be mounted on both simultaneously. Furthermore, the front-end component can also be optional: when high torque is not required, the outer end cover can be used as the front-end component and mounted on the front end of the motor outer cylinder; when high torque is required, the front-end component can be a reducer, fixedly connected to the motor outer cylinder, with one end of the rotor 6 serving as the reducer input end to drive the reduction gear. The rotor output shaft can be a spline, keyway, polygonal shaft, or flat shaft.

[0042] In this invention, when the motor starts, compressed air acts on the inner side of the blade 7 through the unfolding air passage 12, ensuring that the blade is in close contact with the inner wall of the cylinder 8, improving initial working stability and offering more reliable performance compared to traditional blades that rely on an elastic structure for unfolding. Simultaneously, the unfolding air passage can be cut off during blade retraction, reducing contraction resistance and improving efficiency. Furthermore, the integrated structure with a reducer meets the needs of high-torque applications, resulting in a more compact structure; the motor outer cylinder can be made with a muffler structure as needed to reduce exhaust noise. The integrated design of the front and rear end covers and the outer end cover further enhances the overall compactness of the structure.

[0043] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A new type of pneumatic motor characterized in that, Include: Front cover (3), cylinder (8), outer tube, rotor, blade, rear cover and stator; The stator is connected between the front cover and the rear cover, and the stator, front cover and rear cover form a cavity containing the rotor inside, the rotor is arranged in the cavity, and the blade is connected with the rotor; The front cover (3) and the rear cover are provided with air holes, the air holes are communicated with the cavity to form an expansion air channel (12), and the rotor (6) is rotatably connected with the rear cover through a bearing (2); The stator comprises a cylinder (8) and an outer tube (5); The outer tube (5) and the cylinder (8) form an air inlet channel and an air outlet channel, and a plurality of air outlet holes are formed in the side wall of the outer tube (5), which are communicated with the air outlet channel; The cylinder (8) is provided with an air inlet channel (16) and an air outlet channel (20); The side surface of the cylinder (8) can be provided with an auxiliary air inlet channel (16) and an auxiliary air outlet channel (20).

2. The novel pneumatic motor as claimed in claim 1, wherein, The connecting part of the outer tube (5), the front cover and the rear cover is provided with a sealing element (4), which is a sealing ring, a sealing gasket or a sealing glue made of rubber.

3. The novel pneumatic motor as claimed in claim 1, wherein, The air hole is communicated with an extension air channel (19), and the extension air channel is located in the inner wall of the front cover and the rear cover, and the extension air channel (19) is communicated with an air outlet (18).

4. The novel air motor as claimed in claim 1, wherein, The stator further comprises a motor housing, the motor housing is provided with an air inlet (14) and an air outlet (18), and the cylinder (8) is arranged in the motor housing.

5. The novel air motor as claimed in claim 1, wherein, The outer tube (5) is provided with an outer air outlet (15).

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