Pneumatic motor with blade air pressure unfolding function

Abstract

The invention relates to a pneumatic motor with a blade air pressure unfolding function, which comprises a stator and a rotor, a sealed space is arranged in the stator, the rotor is positioned in the sealed space, the rotor is connected with a blade capable of moving along the radial direction of the rotor, the sealed space is communicated with an unfolding air passage, and compressed air enters the sealed space from the unfolding air passage. The compressed air applies acting force to the blades, so that the blades move in the direction away from the central axis of the rotor; compared with the prior art, the invention has the following beneficial effects: the motor is internally provided with the unfolding air passage capable of controlling the movement of the blades; 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 sleeve, the problems that starting is slow and normal starting cannot be achieved only through a centrifugal blade unfolding structure are effectively solved, compared with a pneumatic motor adopting an elastic structure to unfold the blades, the pneumatic motor is more stable and reliable, fatigue failure caused by repeated deformation of elastic elements is reduced, and the service life of the pneumatic motor is prolonged. And the resistance generated when the blades contract inwards can be reduced.

Description

Technical Field

[0001] The invention belongs to the field of blade motors and the technology, and in particular relates to a pneumatic motor with a blade air pressure expansion function. Background Art

[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. Vane-type pneumatic motors are widely used in the industry due to their compact structure and automatic compensation for blade wear. During the operation of the pneumatic motor, the blades constantly rub back and forth inside the cylinder sleeve, causing wear on the blade end surface. Blade wear causes the connection between the blade and the rotor to decrease in tightness. Pneumatic motors that use spring blade expansion will have their elastic expansion force reduced after blade wear, resulting in reduced work efficiency and increased vibration and noise, which will reduce the service life of the pneumatic motor.

[0003] The blades of a traditional vane motor are expanded by elastic parts or only by the centrifugal force when the blades rotate. Due to the working principle of the elastic parts, the elastic force of the elastic parts is greater in the compressed state. When the blades are expanded outward, the expansion force is much smaller. Therefore, when the blades are not affected by the centrifugal force at startup, the startup response of the traditional elastic blade expansion structure is slow. In addition, due to the high-speed operation of the motor, the elastic parts are constantly changing alternately. The service life of the traditional motor that uses elastic parts to expand the blades is affected by the life of the elastic parts. In traditional pneumatic motors that only rely on centrifugal force to expand, the blades may shrink in the rotor slots and not effectively fit the inner wall of the cylinder sleeve, which leads to failure to start and small starting torque, and failure to start under load.

[0004] For example: In the prior art, the authorization announcement number is: CN213016778U, a new type of five-blade forward and reverse pneumatic motor, whose blades are unfolded by springs, "five blade grooves are each provided with a blade, and the top of the blade is provided with a roller. When the blade rotates, the outer wall of the roller presses against the inner wall of the air cavity and rotates under the action of the spring"; its blades are unfolded into an elastic unfolding structure, so there is a situation in which the elastic element is easily damaged due to fatigue during use, resulting in motor failure. Therefore, a pneumatic motor that can start quickly and has a better service life is needed to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides a pneumatic motor with a blade air pressure expansion function, which enables the blades to be effectively attached to the cylinder liner wall and improves the service life and efficiency of the motor.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is a pneumatic motor with a blade air pressure expansion function, comprising a stator and a rotor, wherein a sealed space is provided in the stator, the rotor is located in the sealed space, and the rotor is connected with blades that can move in the radial direction of the rotor;

[0007] The sealed space is connected with an expansion airway, and compressed air enters the cavity between the inner side of the blade and the rotor through the expansion airway, and the compressed air exerts a force on the blade, so that the blade moves away from the central axis of the rotor.

[0008] Furthermore, a placement groove is provided on the rotor, the blades are connected to the placement groove, both ends of the placement groove are open ends, and compressed air can enter the placement groove.

[0009] Furthermore, the side surface of the blade located in the placement groove is an arc-shaped surface, and the compressed air exerts a force on the arc-shaped surface of the blade.

[0010] Furthermore, the number of the blades is the same as the number of the placement slots, and the number of the blades is at least two.

[0011] Furthermore, the stator includes a cylinder sleeve, the rotor is located in the cylinder sleeve, and the two ends of the cylinder sleeve are respectively connected to a front cover and a rear cover. The cylinder sleeve and the front cover and the rear cover enclose a sealed space connected to the deployment airway.

[0012] Furthermore, the expansion air passage is arranged on the front end cover and the rear end cover, the expansion air passage is connected with the extension air passage, and the extension air passage is located in the wall of the cylinder sleeve.

[0013] Furthermore, the stator also includes a motor housing, the motor housing is provided with an air inlet and an exhaust port, and the cylinder sleeve is located in the motor housing.

[0014] Furthermore, the stator is connected to a reducer, and one end of the rotor extends into the reducer as an input end of the reducer.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: an expansion air duct that can control the movement of the blades is provided inside the motor; when the motor is started, compressed air acts on the inner side of the blades through the air duct to ensure that the blades can effectively adhere to the cylinder sleeve, and the air pressure can stabilize the adhesion force, effectively solving the problem of slow starting and abnormal starting of the structure that only relies on centrifugal expansion of the blades. It is more stable and reliable than the pneumatic motor that uses an elastic structure to expand the blades, reduces fatigue failure caused by repeated deformation of the elastic elements, and can reduce the resistance of the blades when they shrink inward, so as to improve work efficiency.

[0016] In addition, it can also be connected to a reducer, which can make the structure compact when used in situations where high torque is required, and meet the needs of use in situations where high torque is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the explosion decomposition structure when the front end component of the present invention is an outer end cover;

[0018] Figure 2 This is a schematic diagram of the exploded structure when the front end component of the present invention is a reducer;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the cylinder sleeve of the present invention;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the cylinder sleeve of the present invention;

[0021] Among them, 1-motor housing, 2-cylinder liner, 3-front cover, 4-rear cover, 5-rotor, 6-blade, 7-placement groove, 8-recessed area, 9-intake duct, 10-extended air duct, 11-expanded air duct, 12-front end component, 13-intake port, 14-exhaust port, 15-muffler exhaust port. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various configurations. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention. In the embodiments, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application.

[0023] See also Figures 1 to 4 As shown, a pneumatic motor with a blade pneumatic expansion function specifically includes a motor housing 1, in which a cylinder sleeve 2, a front end cover 3 and a rear end cover 4 are arranged, and the cylinder sleeve 2 is positioned and docked with the front end cover 3 and the rear end cover 4 by positioning pins, so that a sealed space is formed in the cylinder sleeve 2, and a rotor 5 is arranged in the cylinder sleeve 2, and the two ends of the rotor 5 are respectively connected to a front bearing and a rear bearing, the front bearing is mounted on the front end cover 3, and the rear bearing is mounted on the rear end cover 4, and at this time, the rotor 5 can rotate after being controlled.

[0024] The rotor 5 is connected with blades 6, and there are at least two blades 6. When there are two blades 6, the two blades 6 are symmetrically arranged with the central axis of the rotor 5 as the central axis. The blades 6 can also be multiple. When the number of blades 6 increases, several blades 6 are arranged in an array around the central axis of the rotor 5. When the motor starts, the blades 6 can be close to the cylinder sleeve 2. At this time, the blades 6 divide the inner wall space of the cylinder sleeve 2 into several parts. When the motor stops working, the blades 6 are separated from the inner wall of the cylinder sleeve 2, so the connection between the blades 6 and the rotor 5 is a movable connection. Specifically, a placement groove 7 is provided on the circumferential surface of the rotor 5. The two ends of this placement groove 7 are open ends. The number of placement grooves 7 corresponds to the number of blades 6. Each placement groove 7 extends along the axial direction of the rotor 5, and the part of the blade 6 close to the rotor 5 is located in the placement groove 7. This blade 6 can move along the radial direction of the rotor 5. When the rotor blade enters the power section, the blade 6 moves in the direction away from the central axis of the rotor 5. After the rotor passes the power section, the blade 6 will reset and move back to the placement groove 7.

[0025] The side surface of the above-mentioned blade 6 close to the central axis of the rotor 5 is an arc surface, and the side surface away from the rotor is a straight curved surface. When the blade 6 is located in the placement groove 7, the arc surface of the blade 6 is not completely in contact with the bottom surface of the placement groove 7. After the compressed air enters the cylinder liner 2, part of the compressed air will act on the inner side of the blade 6 through the expanded air duct 11, that is, the compressed air exerts a force on the arc surface of the blade 6, thereby moving the blade 6 away from the central axis of the rotor 5 until the straight curved surface of the blade 6 is tightly attached to the inner wall of the cylinder liner 5. When the compressed air is cut off, the blade 6 can retract and reset to the placement groove.

[0026] A recessed area 8 is provided on the outer wall of the cylinder liner 2. When the cylinder liner 2 is located in the motor housing 1, the outer wall of the cylinder liner 2 fits with the inner wall of the motor housing 1. At this time, an air intake space is formed between the recessed area on the cylinder liner 2 and the inner wall of the motor housing 1. A plurality of air intake passages 9 are provided on the bottom surface of the recessed area 8. The air intake passages 9 are connected with an extended air passage 10 located in the wall of the cylinder liner 2. The extended air passage 10 extends from one end face of the cylinder liner 2 to the other end face. At this time, the extended air passage 10 is parallel to the central axis of the cylinder liner 2, and the front end cover 3 and the rear end cover 3 are connected. The end cover 4 is provided with an expansion air duct 11, which is connected with the extension air duct 10. Compressed air can enter the extension air duct 10 from the air inlet duct 9, and then enter the internal space of the cylinder liner 2 after passing through the expansion air duct 11. The space between the inner side of the blade and the rotor is connected with the expansion air duct 11. At this time, the compressed air can enter the placement groove 7. As the compressed air gradually fills the sealed space inside the cylinder liner 2, the compressed air acts on the curved surface of the blade 6, thereby causing the blade 6 to move in the direction away from the central axis of the rotor 5.

[0027] The front end of the above-mentioned motor housing 1 is docked with a front end component 12, and the motor housing 1 and the rear end cover 4, the cylinder liner 2, the front end cover 3 and the front end component 12 form a stator. The front end of the motor housing 1 has an opening, and its rear end is a closed end. The front end component 12 is docked at the front end opening of the motor housing 1, and the motor housing 1 is provided with an air inlet 13 and an exhaust port 14 and / or a silencer exhaust port 15.

[0028] In addition to the above embodiments, the deployment air duct 11 can be set on the front cover 3 or the rear cover 4 according to actual needs, that is, there is no need to set the deployment air duct 11 on both. At the same time, the front end component 12 can be selected. When a large torque is not required, the front end component 12 can be selected as an outer end cover, and the outer end cover is directly installed on the front end of the motor housing 1. When a large torque is required, the front end component 12 is selected as a reducer, and the reducer is directly connected to the motor housing 1. One end of the rotor 5 extends into the interior of the reducer and directly serves as the input end of the reducer to drive the reduction gear. The output shaft of the rotor 5 can be in the form of a spline, a keyway, a polygonal shaft or a flat shaft.

[0029] In the present application, when the motor is started, compressed air acts on the inner side of the blade 6 through the expansion air duct 11 to ensure that the blade 6 can effectively stick to the cylinder sleeve 2 when the motor is started. The air pressure plays a role in stabilizing the sticking force, which is more stable and reliable than the pneumatic motor that adopts an elastic structure to expand. The expansion air duct 11 is cut off when the blade 6 contracts inwardly, which can reduce the resistance of the blade 6 when it contracts inward, so as to improve the working efficiency. In addition, the integrated structure with the reducer can be compact when used in occasions where large torque is required, which meets the needs of use in occasions where large torque is required. When necessary, the motor housing 1 can be made into a structure with a muffler, which can effectively reduce the exhaust noise and make the structure more compact.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be an electrical connection; it can be a hydraulic oil circuit connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pneumatic motor with a blade pressure expansion function, characterized in that: The invention comprises a stator and a rotor, wherein a cavity is arranged in the stator, the rotor is located in the cavity, and the rotor is connected with blades which can move along the radial direction of the rotor; The cavity between the inner side of the blade and the rotor is connected to the expansion airway, and compressed air enters between the inner side of the blade and the rotor through the expansion airway. The compressed air exerts an outward force on the blade, causing the blade to move away from the central axis of the rotor.

2. A starter motor with a blade air pressure expansion function according to claim 1, characterized in that: The rotor is provided with a placement groove, and the blade is located in the placement groove and can move radially along the placement groove.

3. A starter motor with a blade air pressure expansion function according to claim 2, characterized in that: The side surface of the blade located in the placement groove is an arc surface, and the compressed air exerts a force on the arc surface of the blade.

4. A starter motor with a blade air pressure expansion function according to any one of claim 3, characterized in that: The number of the blades is the same as the number of the placement slots, and the number of the blades is at least two.

5. The pneumatic motor with blade pressure expansion function according to claim 1, characterized in that: The stator comprises a cylinder sleeve, the rotor is located in the cylinder sleeve, the two ends of the cylinder sleeve are respectively connected with a front cover and a rear cover, and the cylinder sleeve, the front cover and the rear cover form a sealed space connected with the deployment airway.

6. The pneumatic motor with blade pressure expansion function according to claim 5, characterized in that: The deployment air channel is arranged on the front end cover and the rear end cover, the deployment air channel is connected with the extension air channel, and the extension air channel is located in the wall of the cylinder sleeve.

7. The pneumatic motor with blade air pressure expansion function according to claim 5, characterized in that: The stator also includes a motor housing, which is provided with an air inlet and an air outlet, and the cylinder sleeve is located inside the motor housing.

8. The pneumatic motor with blade pneumatic expansion function according to any one of claims 1 to 7, characterized in that: The stator is connected to a reducer, and one end of the rotor extends into the reducer as an input end of the reducer.

9. The pneumatic motor with blade pressure expansion function according to claim 7, characterized in that: The motor housing is provided with a sound-absorbing exhaust port.

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