Pneumatic motor

Abstract

The invention relates to the technical field of power devices, and particularly discloses a pneumatic motor which comprises a shell, a rotor assembly and a rotating shaft, a working cavity is formed in the shell, the rotor assembly is arranged in the working cavity and comprises a rotor body and a plurality of blades, the blades are arranged on the periphery of the rotor body at intervals, and the rotating shaft is arranged in the working cavity. The rotating shaft is fixedly connected to the rotor body, the acting cavity can receive high-pressure gas, the high-pressure gas expands to act to push the blades to rotate so as to drive the rotor body to rotate, and the center line of the rotating shaft, the center line of the rotor body and the center line of the acting cavity coincide. According to the arrangement, the concentric design is adopted, it is guaranteed that when the rotor assembly rotates, stress is even, large radial vibration is not prone to being generated, operation stability is good, contact pressure of the blades is evenly distributed, abrasion resistance is reduced, and the overall service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of power devices, and particularly to a pneumatic motor. Background Art

[0002] A pneumatic motor is a device that converts the energy of compressed air into mechanical energy. It is mainly divided into vane pneumatic motors and piston pneumatic motors. It drives the rotation of a rotor or a piston through gas expansion to output rotational or linear power, and is generally used as a rotational power source for complex devices or machines.

[0003] The existing vane pneumatic motors mainly adopt an eccentric design, in which the rotation axis does not coincide with the center of inertia, which easily causes large radial vibrations when the rotor rotates. Moreover, this structure limits the maximum rotational speed of the pneumatic motor to a certain extent, thus restricting its application range.

[0004] Therefore, there is an urgent need for a pneumatic motor to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a pneumatic motor to solve the problem that the eccentric design of the existing vane pneumatic motor easily causes large radial vibrations when the rotor rotates, thereby limiting its maximum rotational speed.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a pneumatic motor, comprising:

[0008] A housing, in which a working cavity is provided;

[0009] A rotor assembly, which is arranged in the working cavity, and the rotor assembly includes a rotor body and a plurality of vanes, and the plurality of vanes are arranged at intervals on the outer periphery of the rotor body;

[0010] A rotating shaft, which is fixedly connected to the rotor body. The working cavity can receive high-pressure gas, and the high-pressure gas expands and does work to push the plurality of vanes to rotate, thereby driving the rotor body to rotate. The center line of the rotating shaft, the center line of the rotor body, and the center line of the working cavity coincide.

[0011] As a preferred technical solution of the above pneumatic motor, a plurality of rotor grooves are recessed in the outer peripheral wall of the rotor body, and a plurality of the vanes correspond to the plurality of rotor grooves one by one, and the vanes are slidably disposed in the rotor grooves. The rotor body is disposed in the working cavity, and the working cavity is divided into a first working chamber and a second working chamber. The bottom wall of the first working chamber is provided with a first curved surface portion, and the first curved surface portion includes a plurality of first curved surface convex segments and a plurality of first curved surface transition segments. The plurality of first curved surface convex segments are arranged at intervals in the circumferential direction, and the first curved surface transition segments are recessed between two adjacent first curved surface convex segments. The bottom wall of the second working chamber is provided with a second curved surface portion, and the second curved surface portion includes a plurality of second curved surface convex segments and a plurality of second curved surface transition segments. The plurality of second curved surface convex segments are arranged at intervals in the circumferential direction, and the second curved surface transition segments are recessed between two adjacent second curved surface convex segments. The first curved surface convex segments and the second curved surface transition segments are correspondingly arranged, and two ends of the vane respectively abut against the first curved surface portion and the second curved surface portion.

[0012] As a preferred technical solution of the above pneumatic motor, the housing includes an upper end cover and a lower end cover, the upper end cover is connected to the lower end cover, and two ends of the rotating shaft respectively rotatably penetrate through the upper end cover and the lower end cover.

[0013] As a preferred technical solution of the above pneumatic motor, the first working chamber is located in the upper end cover. A plurality of first air inlet holes and a plurality of first air outlet holes are formed in the inner wall of the first working chamber. The plurality of first air outlet holes communicate the first working chamber with the external air. The upper end cover is provided with a first annular air inlet flow channel, and the plurality of first air inlet holes are all communicated with the first annular air inlet flow channel. A first air suction port communicated with the first annular air inlet flow channel is provided on the outer side wall of the upper end cover.

[0014] As a preferred technical solution of the above pneumatic motor, the pneumatic motor further includes a first dust cover. The first dust cover includes a first connecting portion and a plurality of first blocking portions. The first connecting portion abuts against the end surface of the upper end cover, and the plurality of first blocking portions protrude from the outer peripheral edge of the first connecting portion, and the plurality of first blocking portions are correspondingly arranged with the plurality of first air outlet holes one by one.

[0015] As a preferred technical solution of the above pneumatic motor, the second working chamber is located in the lower end cover. A plurality of second air inlet holes and a plurality of second air outlet holes are formed in the inner wall of the second working chamber. The plurality of second air outlet holes communicate the second working chamber with the external air. The upper end cover is provided with a second annular air inlet flow channel, and the plurality of second air inlet holes are all communicated with the second annular air inlet flow channel. A second air suction port communicated with the second annular air inlet flow channel is provided on the outer side wall of the upper end cover.

[0016] As a preferred technical solution of the above pneumatic motor, the pneumatic motor further includes a second dust cover, which includes a second connecting portion and a plurality of second blocking portions. The second connecting portion abuts against the end face of the lower end cover, and the plurality of second blocking portions protrude from the outer peripheral edge of the second connecting portion, and the plurality of second blocking portions are arranged in one-to-one correspondence with the plurality of second air outlet holes.

[0017] As a preferred technical solution of the above pneumatic motor, the pneumatic motor further includes a sealing ring, which is arranged between the upper end cover and the lower end cover.

[0018] As a preferred technical solution of the above pneumatic motor, a first annular groove is recessed in the end face of the upper end cover, and a second annular groove is recessed in the end face of the lower end cover. The first annular groove and the second annular groove are arranged corresponding to each other, and the sealing ring is simultaneously placed in the first annular groove and the second annular groove.

[0019] As a preferred technical solution of the above pneumatic motor, the rotor body includes a main body portion, a first limiting portion and a second limiting portion. The first limiting portion and the second limiting portion respectively protrude from the end faces at both ends of the main body portion, and the first limiting portion and the second limiting portion respectively abut against the bottom wall of the first working chamber and the bottom wall of the second working chamber. A plurality of blades are arranged at intervals on the outer periphery of the main body portion.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention provides a pneumatic motor, which includes a housing, a rotor assembly and a rotating shaft. A working cavity is arranged in the housing. The rotor assembly is arranged in the working cavity, and the rotor assembly includes a rotor body and a plurality of blades. The plurality of blades are arranged at intervals on the outer periphery of the rotor body. The rotating shaft is fixedly connected to the rotor body. The working cavity can receive high-pressure gas, and the high-pressure gas expands and does work to push the plurality of blades to rotate, thereby driving the rotor body to rotate. The center line of the rotating shaft, the center line of the rotor body and the center line of the working cavity coincide. With such a setting, a concentric design is adopted to ensure that the rotor assembly is evenly stressed during rotation, is not prone to large radial vibrations, has good running stability, and the contact pressure distribution of the blades is uniform, reducing the wear resistance and extending the overall service life. Description of the Drawings

[0022] Figure 1 is an exploded view of the pneumatic motor provided by the present invention;

[0023] Figure 2 is a structural schematic diagram of the pneumatic motor provided by the present invention;

[0024] Figure 3 is a cross-sectional view of the pneumatic motor provided by the present invention;

[0025] Figure 4 Schematic structural diagram of the upper end cover provided by the present invention;

[0026] Figure 5 Schematic structural diagram of the lower end cover provided by the present invention;

[0027] Figure 6 Schematic structural diagram of the first dust cover provided by the present invention.

[0028] Wherein:

[0029] 1. Housing; 101. Upper end cover; 102. Lower end cover;

[0030] 2. Rotor assembly; 201. Rotor body; 202. Blade;

[0031] 3. Rotating shaft; 4. First working chamber; 5. Second working chamber; 6. First curved surface part; 7. Second curved surface part; 8. First air inlet hole; 9. First air outlet hole; 10. First suction port;

[0032] 11. First dust cover; 111. First cover connection part; 112. First blocking part;

[0033] 12. Second air inlet hole; 13. Second air outlet hole; 14. Second suction port; 15. Second dust cover; 16. First annular groove; 17. Second annular groove. Detailed implementation manners

[0034] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0036] Unless otherwise clearly stipulated and defined, the terms "install", "connect", "link", "fix" shall be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0039] As Figures 1 to 6 shown, this embodiment provides a pneumatic motor, which includes: a housing 1, a rotor assembly 2 and a rotating shaft 3. A working cavity is arranged inside the housing 1. The rotor assembly 2 is arranged inside the working cavity. The rotor assembly 2 includes a rotor body 201 and a plurality of blades 202. The plurality of blades 202 are arranged at intervals on the outer periphery of the rotor body 201. The rotating shaft 3 is fixedly connected to the rotor body 201. The working cavity can receive high-pressure gas. The high-pressure gas expands and does work to push the plurality of blades 202 to rotate, thereby driving the rotor body 201 to rotate. The center line of the rotating shaft 3, the center line of the rotor body 201 and the center line of the working cavity coincide. With such a setting, a concentric design is adopted to ensure that the rotor assembly 2 is evenly stressed during rotation, is not likely to generate large radial vibrations, has good running stability, and the contact pressure distribution of the blades 202 is uniform, reducing the wear resistance and prolonging the overall service life.

[0040] Optionally, a plurality of rotor grooves are recessed in the outer peripheral wall of the rotor body 201. A plurality of blades 202 correspond to the plurality of rotor grooves one by one, and the blades 202 are slidably disposed in the rotor grooves. The rotor body 201 is disposed in the working cavity, and the working cavity is divided into a first working chamber 4 and a second working chamber 5. The bottom wall of the first working chamber 4 is provided with a first curved surface portion 6. The first curved surface portion 6 includes a plurality of first curved surface convex segments and a plurality of first curved surface transition segments. The plurality of first curved surface convex segments are arranged at intervals in the circumferential direction, and a first curved surface transition segment is recessed between two adjacent first curved surface convex segments. The bottom wall of the second working chamber 5 is provided with a second curved surface portion 7. The second curved surface portion 7 includes a plurality of second curved surface convex segments and a plurality of second curved surface transition segments. The plurality of second curved surface convex segments are arranged at intervals in the circumferential direction, and a second curved surface transition segment is recessed between two adjacent second curved surface convex segments. The first curved surface convex segments and the second curved surface transition segments are arranged in correspondence. The two ends of the blade 202 respectively abut against the first curved surface portion 6 and the second curved surface portion 7. Specifically, the number of both the first curved surface convex segments and the first curved surface transition segments is four.

[0041] Optionally, the housing 1 includes an upper end cover 101 and a lower end cover 102. The upper end cover 101 is connected to the lower end cover 102. The two ends of the rotating shaft 3 respectively pass through the upper end cover 101 and the lower end cover 102 in a rotatable manner. Further, the upper end cover 101 is provided with four first threaded holes at intervals and evenly in the circumferential direction, and the lower end cover 102 is provided with four second threaded holes at intervals and evenly in the circumferential direction. The first threaded holes and the second threaded holes are arranged in correspondence and are connected by bolts. Further still, the upper surface of the upper end cover 101 is provided with four threaded holes for connecting with the pneumatic motor bracket.

[0042] Optionally, the first working chamber 4 is located in the upper end cover 101. A plurality of first air inlet holes 8 and a plurality of first air outlet holes 9 are formed in the inner wall of the first working chamber 4. The plurality of first air outlet holes 9 communicate the first working chamber 4 with the external air. The upper end cover 101 is provided with a first annular air inlet flow channel. The plurality of first air inlet holes 8 are all communicated with the first annular air inlet flow channel. A first air suction port 10 communicated with the first annular air inlet flow channel is provided on the outer side wall of the upper end cover 101. With such an arrangement, the high-pressure gas enters the first annular air inlet flow channel through the first air suction port 10 and finally enters the first working chamber 4 through the plurality of air inlet holes, which further optimizes the uniformity of the high-pressure air flow distribution, reduces the air flow impact and the generation of eddy currents, reduces the turbulent loss, and can avoid the unilateral wear of the blade 202 caused by unilateral air intake, ensure the uniform force thereof, and significantly improve the efficiency, stability and durability of the pneumatic motor.

[0043] In this embodiment, the number of the first air inlet holes 8 is four and they are arranged in central symmetry, and the angular interval between two adjacent first air inlet holes 8 is 90 degrees.

[0044] Optionally, the pneumatic motor further includes a first dust cover 11. The first dust cover 11 includes a first cover connecting portion 111 and a plurality of first blocking portions 112. The first cover connecting portion 111 abuts against the end face of the upper end cover 101. The plurality of first blocking portions 112 protrude from the outer peripheral edge of the first cover connecting portion 111, and the plurality of first blocking portions 112 are arranged in one-to-one correspondence with the plurality of first air outlet holes 9. With such an arrangement,

[0045] through the corresponding cooperation between the blocking portion and the air outlet hole, large particle impurities can be prevented from entering the inside of the housing 1 through the air outlet hole, and the first dust cover 11 can rotate slightly, so that the gap between the air outlet hole and the first dust cover 11 becomes larger, the exhaust resistance is reduced, and the efficiency of the pneumatic motor is further improved.

[0046] Optionally, the second working chamber 5 is located in the lower end cover 102. A plurality of second air inlet holes 12 and a plurality of second air outlet holes 13 are formed in the inner wall of the second working chamber 5. The plurality of second air outlet holes 13 communicate the second working chamber 5 with the external air. The upper end cover 101 is provided with a second annular air inlet flow channel. The plurality of second air inlet holes 12 are all communicated with the second annular air inlet flow channel. A second air suction port 14 communicated with the second annular air inlet flow channel is provided on the outer side wall of the upper end cover 101. Further, the number of the second air inlet holes 12 is four, and they are arranged in central symmetry, and the included angle between two adjacent second air inlet holes 12 is 90 degrees.

[0047] Optionally, the pneumatic motor further includes a second dust cover 15. The second dust cover 15 includes a second cover connecting portion and a plurality of second blocking portions. The second cover connecting portion abuts against the end face of the lower end cover 102. The plurality of second blocking portions protrude from the outer peripheral edge of the second cover connecting portion, and the plurality of second blocking portions are arranged in one-to-one correspondence with the plurality of second air outlet holes 13.

[0048] Specifically, the following technical solution is exemplarily given in this embodiment: the number of the vanes 202 is nine, which serves to seal the first working chamber 4 and the second working chamber 5. The vanes 202 can slide up and down in the corresponding rotor grooves, and their length is equal to the distance between the first curved surface portion 6 and the second curved surface portion 7. During the rotation of the rotor body 201, the vanes 202 will change with the change of the rotation angle of the rotor body 201, and the change amount is limited by the end faces on both sides.

[0049] Taking the second working chamber 5 in this embodiment as an example, the working principle is described as follows:

[0050] It is jointly composed of the outer surface of the rotor body 201, the second curved surface portion 7, the inner side wall of the lower end cover 102, the blade 202, and the lower surface of the rotor body 201. The size, shape, and position of the second working chamber 5 change with the rotation angle of the rotor body 201. Among them, when the second working chamber 5 is in the intake position, the high-pressure gas enters the second working chamber 5 from the second annular intake flow path through a number of second intake holes 12. Due to the pressure of the gas in the second working chamber 5, the second working chamber 5 tends to change towards a larger space, that is, when the rotor body 201 moves in the clockwise direction, the distance between the lower surface of the rotor body 201 and the second curved surface portion 7 increases, and the distance between the blades 202 remains unchanged. Then, the actual contained space of each working air chamber formed by the blades 202 separating the second working chamber 5 will increase, and this change continues until the blade 202 reaches the lowest position of the curved surface of the second curved surface portion 7. When the rotor body 201 continues to rotate, the distance between the lower surface of the rotor body 201 and the upper curved surface of the second curved surface portion 7 gradually decreases. At the same time, the second working chamber 5 passes through the second exhaust hole 13 on the inner wall of the lower end cover 102, and the high-pressure air after work is discharged from the second exhaust hole 13, and the next working air chamber has started to intake air and repeats this cycle.

[0051] It should be noted that in order to ensure that the blade 202 is always tangent to the end faces of the first curved surface portion 6 and the second curved surface portion 7 at both ends, the first curved surface portion 6 and the second curved surface portion 7 are arranged in parallel, that is, the lowest point of the curved surface of the second curved surface portion 7 corresponds to the highest point of the curved surface of the first curved surface portion 6. Then, the working phases of the first working chamber 4 and the second working chamber 5 differ by 45 degrees, that is, when the second working chamber 5 of the lower end cover 102 is in the intake stage, the corresponding first working chamber of the upper end cover 101 is in the exhaust stage. The working process of the first working chamber 4 is the same as that of the second working chamber 5 in principle, and will not be elaborated here.

[0052] Optionally, in order to improve the airtightness of the housing 1, the pneumatic motor further includes a sealing ring. The sealing ring is arranged between the upper end cover 101 and the lower end cover 102. The end face of the upper end cover 101 is recessed with a first annular groove 16, and the end face of the lower end cover 102 is recessed with a second annular groove 17. The first annular groove 16 and the second annular groove 17 are correspondingly arranged, and the sealing ring is placed in the first annular groove 16 and the second annular groove 17 at the same time. Further, the sealing ring is made of rubber material. With this setting, when the upper end cover 101 and the lower end cover 102 are buckled, the first annular groove 16 and the second annular groove 17 are correspondingly matched and can accommodate the sealing ring, which is used to seal the high-pressure air inside the housing 1 and prevent the gas from escaping from the joint.

[0053] In this embodiment, the rotor body 201 includes a main body portion, a first limiting portion, and a second limiting portion. The first limiting portion and the second limiting portion are respectively convexly provided on the end faces at both ends of the main body portion, and the first limiting portion and the second limiting portion respectively abut against the bottom wall of the first working chamber 4 and the bottom wall of the second working chamber 5. A plurality of blades 202 are arranged at intervals on the outer periphery of the main body portion.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pneumatic motor, characterized in that, Comprising: A housing (1) with a working cavity provided therein; A rotor assembly (2) disposed within the working cavity, and the rotor assembly (2) includes a rotor body (201) and a plurality of blades (202), and the plurality of blades (202) are spaced apart and disposed on the outer periphery of the rotor body (201); A rotating shaft (3) fixedly connected to the rotor body (201), the working cavity being capable of receiving high-pressure gas, the high-pressure gas expanding and doing work to push the plurality of blades (202) to rotate, thereby driving the rotor body (201) to rotate, and the center line of the rotating shaft (3), the center line of the rotor body (201) and the center line of the working cavity coincide.

2. The pneumatic motor according to claim 1, characterized in that, A plurality of rotor grooves are recessed in the outer peripheral wall of the rotor body (201), the plurality of blades (202) correspond to the plurality of rotor grooves one by one, and the blades (202) are slidably disposed within the rotor grooves. The rotor body (201) is disposed within the working cavity, dividing the working cavity into a first working chamber (4) and a second working chamber (5). The bottom wall of the first working chamber (4) is provided with a first curved surface portion (6), and the first curved surface portion (6) includes a plurality of first curved surface convex segments and a plurality of first curved surface transition segments. The plurality of first curved surface convex segments are arranged at intervals in the circumferential direction, and the first curved surface transition segments are recessed between two adjacent first curved surface convex segments. The bottom wall of the second working chamber (5) is provided with a second curved surface portion (7), and the second curved surface portion (7) includes a plurality of second curved surface convex segments and a plurality of second curved surface transition segments. The plurality of second curved surface convex segments are arranged at intervals in the circumferential direction, and the second curved surface transition segments are recessed between two adjacent second curved surface convex segments. The first curved surface convex segments and the second curved surface transition segments are arranged in correspondence, and the two ends of the blade (202) respectively abut against the first curved surface portion (6) and the second curved surface portion (7).

3. The pneumatic motor according to claim 2, characterized in that, The housing (1) includes an upper end cover (101) and a lower end cover (102), the upper end cover (101) is connected to the lower end cover (102), and the two ends of the rotating shaft (3) respectively rotatably penetrate through the upper end cover (101) and the lower end cover (102).

4. The pneumatic motor according to claim 3, characterized in that The first working chamber (4) is located within the upper end cover (101), and a plurality of first air inlet holes (8) and a plurality of first air outlet holes (9) are opened on the inner wall of the first working chamber (4). The plurality of first air outlet holes (9) communicate the first working chamber (4) with the external air. The upper end cover (101) is provided with a first annular air inlet flow passage, and the plurality of first air inlet holes (8) all communicate with the first annular air inlet flow passage. A first air suction port (10) communicating with the first annular air inlet flow passage is provided on the outer side wall of the upper end cover (101).

5. The pneumatic motor according to claim 4, characterized in that, The pneumatic motor further includes a first dust cover (11), the first dust cover (11) includes a first connecting portion (111) and a plurality of first blocking portions (112), the first connecting portion (111) abuts against the end face of the upper end cover (101), and the plurality of first blocking portions (112) protrude from the outer peripheral edge of the first connecting portion (111), and the plurality of first blocking portions (112) are arranged in one-to-one correspondence with the plurality of first air outlet holes (9).

6. The pneumatic motor according to claim 3, characterized in that, The second working chamber (5) is located in the lower end cover (102), a plurality of second air inlet holes (12) and a plurality of second air outlet holes (13) are formed in the inner wall of the second working chamber (5), the plurality of second air outlet holes (13) communicate the second working chamber (5) with the external air, the upper end cover (101) is provided with a second annular air flow passage, and the plurality of second air inlet holes (12) are all communicated with the second annular air flow passage, and a second air suction port (14) communicated with the second annular air flow passage is arranged on the outer side wall of the upper end cover (101).

7. The pneumatic motor according to claim 6, wherein, The pneumatic motor further includes a second dust cover (15), the second dust cover (15) includes a second connecting portion and a plurality of second blocking portions, the second connecting portion abuts against the end face of the lower end cover (102), the plurality of second blocking portions protrude from the outer peripheral edge of the second connecting portion, and the plurality of second blocking portions are arranged in one-to-one correspondence with the plurality of second air outlet holes (13).

8. The pneumatic motor according to claim 3, characterized in that, The pneumatic motor further includes a sealing ring, and the sealing ring is arranged between the upper end cover (101) and the lower end cover (102).

9. The pneumatic motor according to claim 8, characterized in that, A first annular groove (16) is recessed in the end face of the upper end cover (101), a second annular groove (17) is recessed in the end face of the lower end cover (102), the first annular groove (16) and the second annular groove (17) are correspondingly arranged, and the sealing ring is simultaneously placed in the first annular groove (16) and the second annular groove (17).

10. The pneumatic motor according to claim 2, characterized in that, The rotor body (201) includes a main body portion, a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion respectively protrude from the end faces at both ends of the main body portion, and the first limiting portion and the second limiting portion respectively abut against the bottom wall of the first working chamber (4) and the bottom wall of the second working chamber (5), and a plurality of blades (202) are arranged at intervals on the outer periphery of the main body portion.

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