End sealing method and structure of rotary piston type pneumatic motor

Abstract

The invention discloses an end sealing method and structure of a rotary piston type pneumatic motor, relates to the technical field of pneumatic motors, and solves the problems that an existing pneumatic motor end sealing structure is complex, and the sealing performance cannot meet the requirement for high efficiency. A spring radial seal and a spring end seal are additionally arranged between a cylinder shell and a blade rotor body, and sealing lubricating oil is injected; triple sealing structures which are matched with one another are adopted, so that the stability of the pneumatic motor in the operation process is ensured; the spring radial sealing and the spring end sealing adopt the structural design that the corrugated springs are matched with the sealing rings or the sealing strips, under the action of the corrugated springs, the sealing performance between the air cylinder shell and the blade rotor body is guaranteed, abrasion between the air cylinder shell and the blade rotor body is reduced, and the stability of the pneumatic motor in the operation process is guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of pneumatic motors, and more particularly to an end sealing method and structure for a rotary piston pneumatic motor. Background Technology

[0002] Pneumatic motors are indispensable general-purpose equipment in industrial production. However, the end seal of rotary piston pneumatic motors has become a problem restricting the motor's power and efficiency. Existing pneumatic motor end seal structures are complex, and their sealing performance cannot meet the requirements for high efficiency, necessitating urgent improvement. Summary of the Invention

[0003] In view of the problems mentioned above, the existing pneumatic motor end sealing structure is complex and the sealing performance cannot meet the requirements of high efficiency. The purpose of this invention is to provide an end sealing method and structure for a rotary piston pneumatic motor.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An end sealing structure for a rotary piston pneumatic motor includes: a cylinder housing, a main shaft, and a vane rotor 16. The cylinder housing includes: a chamber cylinder 1, a front end cover 2, and a rear end cover 3, which are arranged sequentially from front to back. The front end of the main shaft is rotatably connected to the front end cover 2, and the rear end of the main shaft is rotatably connected to the rear end cover 3. The vane rotor 16 is disposed inside the chamber cylinder 1 and sleeved on the main shaft.

[0006] The inner wall of the chamber cylinder 1 has a petal-shaped cross-section, and the outer wall of the blade rotor 16 has a petal-shaped cross-section. The outer wall of the blade rotor 16 matches the inner wall of the chamber cylinder 1, and the number of petals in the blade rotor 16 is one less than the number of petals in the chamber cylinder 1.

[0007] It also includes: a spring radial seal 12 and a spring end seal 13. Spring limiting grooves 163 are provided on the front and rear end faces of the blade rotor body 16. A spring end seal 13 is installed in each spring limiting groove 163. The spring end seal 13 located on the front end face of the blade rotor body 16 abuts against the front end cover 2, and the spring end seal 13 located on the rear end face of the blade rotor body 16 abuts against the rear end cover 3. Multiple strip-shaped limiting grooves are provided on the inner wall of the chamber cylinder 1. A spring radial seal 12 is installed in each strip-shaped limiting groove, and the multiple spring radial seals 12 abut against the outer wall of the blade rotor body 16.

[0008] The chamber cylinder 1 is provided with a housing air inlet 101; the front end cover 2 is provided with a housing exhaust port 102; the housing air inlet 101 is connected to an external air passage, which is used to drive the blade rotor 16 to rotate in the cylinder housing and thus drive the main shaft to rotate.

[0009] Each front end cover 2 is provided with the same number of oil passages 22 as the spring radial seals 12. Each oil passage 22 on the front end cover 2 is located at the front end of a spring radial seal 12. The oil passages 22 on the front end cover 2 are used to inject sealing lubricating oil between the front end cover 2 and the blade rotor body 16 to achieve sealing and pressure maintenance.

[0010] Each rear end cover 3 is provided with an oil passage 22 in the same number as the spring radial seal 12. Each oil passage 22 on the rear end cover 3 is located at the rear end of a spring radial seal 12. The oil passages 22 on the rear end cover 3 are used to inject sealing lubricating oil between the rear end cover 3 and the blade rotor body 16 to achieve sealing and pressure maintenance.

[0011] In the aforementioned end sealing structure of the rotary piston pneumatic motor, a one-way air inlet valve is installed in each housing air inlet 101.

[0012] The aforementioned end sealing structure of the rotary piston pneumatic motor further includes: an end cap connecting screw 4 and an end cap connecting nut 5. The chamber cylinder 1 is provided with multiple through holes for inserting the end cap connecting screw 4. Each end cap connecting screw 4 has external threads at both its front and rear ends. The front end of each end cap connecting screw 4 passes through the front end cap 2 and is locked and limited by an end cap connecting nut 5. The rear end of each end cap connecting screw 4 passes through the rear end cap 3 and is locked and limited by another end cap connecting nut 5.

[0013] The end sealing structure of the aforementioned rotary piston pneumatic motor includes a petal-shaped end face of the blade rotor body 16, where each petal is a smoothly transitioning arc shape that protrudes outward; the number of petals can be 2 to 9.

[0014] The aforementioned end sealing structure of the rotary piston pneumatic motor includes a main shaft comprising an exhaust-side eccentric shaft 6 and an eccentric main shaft 7. The exhaust-side eccentric shaft 6 has an eccentric shaft insertion groove at its rear end, and the front end of the eccentric main shaft 7 is connected to the eccentric shaft insertion groove by a key. The front section of the exhaust-side eccentric shaft 6 and the rear section of the eccentric main shaft 7 are coaxially arranged.

[0015] The aforementioned end sealing structure of the rotary piston pneumatic motor further includes: a second rolling bearing 17, a sleeve 18, and a piston end cap 19. The vane rotor body 16 and the front section of the eccentric main shaft 7 are rotatably connected by two second rolling bearings 17. The sleeve 18 is sleeved on the front section of the eccentric main shaft 7 and located between the two second rolling bearings 17. The front and rear ends of the sleeve 18 abut against the inner rings of the two second rolling bearings 17, respectively. The piston end cap 19 is sleeved on the front section of the eccentric main shaft 7 and installed at the rear end of the vane rotor body 16. The piston end cap 19 is used to limit and seal the second rolling bearing 17 located on the rear side.

[0016] The aforementioned end sealing structure of the rotary piston pneumatic motor further includes a gear ring drive structure, which comprises a large gear ring 8 and a gear shaft 9. The large gear ring 8 is mounted on the rear end face of the front end cover 2, and the gear shaft 9 is sleeved on the front section of the eccentric main shaft 7. The outer teeth of the gear shaft 9 mesh with the inner ring of the large gear ring 8. The rear section of the gear shaft 9 has a square cross-section, and the rear section of the gear shaft 9 is inserted into the front end of the blade rotor body 16. The blade rotor body 16 is used to drive the gear shaft 9 to rotate synchronously on the eccentric main shaft 7.

[0017] In the aforementioned end sealing structure of the rotary piston pneumatic motor, the front end of the blade rotor body 16 is provided with multiple piston exhaust grooves 162, and the outer wall of the blade rotor body 16 is provided with multiple piston exhaust ports 161, each piston exhaust port 161 being connected to a piston exhaust groove 162.

[0018] In the aforementioned end sealing structure of the rotary piston pneumatic motor, a spring radial seal 12 is provided between any two adjacent piston exhaust ports 161.

[0019] The end sealing structure of the aforementioned rotary piston pneumatic motor further includes: rolling bearing 10 and rolling bearing 20, the exhaust side eccentric shaft 6 and the front end cover 2 are rotatably connected by rolling bearing 10, and the rear shaft of the eccentric main shaft 7 and the rear end cover 3 are rotatably connected by rolling bearing 20.

[0020] The end sealing structure of the aforementioned rotary piston pneumatic motor further includes: an elastic retaining ring 11; an elastic retaining ring 11 for limiting the rolling bearing 10 is installed on the exhaust-side eccentric shaft 6; an elastic retaining ring 11 for limiting the rolling bearing 17 located on the front section of the eccentric main shaft 7 is installed on the front section of the eccentric main shaft 7; and an elastic retaining ring 11 for limiting the rolling bearing 20 is installed on the rear section of the eccentric main shaft 7.

[0021] The aforementioned end sealing structure of the rotary piston pneumatic motor further includes: a front sealing end cover 14 and a rear sealing end cover 15. The front sealing end cover 14 is installed on the front end face of the front end cover 2 and is used to seal the rolling bearing 10. The rear sealing end cover 15 is installed on the rear end face of the rear end cover 3 and is used to seal the rolling bearing 20.

[0022] An end-sealing method for a rotary piston pneumatic motor, applicable to the aforementioned end-sealing structure of the rotary piston pneumatic motor, wherein each oil passage 22 is used to inject sealing lubricating oil into the cylinder housing, and each spring radial seal 12 has an oil passage 22 at both its front and rear ends; when the outer wall of the vane rotor body 16 is in contact with the inner wall of any petal-shaped cavity of the chamber cylinder 1, the petal-shaped cavity is a high-pressure chamber; such as Figure 16As shown; the spring radial seals 12 located on both sides of the high-pressure chamber are filled with sealing lubricating oil at both ends to achieve sealing and pressure maintenance.

[0023] The sealing position after the injection of sealing lubricating oil is as follows: Figure 9 and Figure 10 As shown.

[0024] like Figure 16 As shown, this embodiment is a three-chamber rotary piston pneumatic motor, in which case the blade rotor 16 is based on... Figure 18 The cycloidal equation in the diagram shows that the axis rotates clockwise while the main axis rotates counterclockwise. Figure 16 In the middle, the top side of the blade rotor body 16 is in contact with the inner wall of the petal-shaped cavity on the top side of the chamber cylinder 1. At this time, the spring radial seals 12 located on the left and right sides of the top petal-shaped cavity are injected with sealing lubricating oil through the oil passage 22 at both the front and rear ends of each spring radial seal 12; ensuring that the rotary piston pneumatic motor can operate stably when the top petal-shaped cavity is under high pressure.

[0025] The present invention, by employing the above-mentioned technology, has the following positive effects compared with the prior art:

[0026] (1) The present invention provides a radial seal and an end seal between the cylinder housing and the blade rotor body, and injects sealing lubricating oil; the triple sealing structure with mutual cooperation ensures the airtightness between the cylinder housing and the blade rotor body, and ensures the stability of the pneumatic motor during operation.

[0027] (2) In this invention, both the radial seal and the end seal of the spring adopt a structure design of corrugated spring combined with sealing ring or sealing strip. Under the action of the corrugated spring, the sealing performance between the cylinder housing and the blade rotor body is guaranteed, and the wear between the two is reduced.

[0028] (3) This invention relates to the technical field of pneumatic motors. The blade rotor body is rotatably installed at an eccentric position on the main shaft. The blade rotor body is driven to rotate in the cylinder housing by an external air passage. Specifically, the blade rotor body is driven to rotate by introducing gas into the cylinder housing through the air passage. Based on the change in the size of the chamber space formed between the eccentric rotating piston and the cylinder, the internal air intake, air compression, and air exhaust processes are realized. The main shaft is driven to rotate through a gear transmission structure to realize the output of power. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a rotary piston pneumatic motor according to the present invention. Figure 2 This is an exploded view of a rotary piston pneumatic motor according to the present invention. Figure 3 This is a front view of a rotary piston pneumatic motor according to the present invention. Figure 4 This is a left view of a rotary piston pneumatic motor according to the present invention. Figure 5 This is a rear view of a rotary piston pneumatic motor according to the present invention. Figure 6 This is a schematic diagram of the assembly of the eccentric main shaft and blade rotor of a rotary piston pneumatic motor according to the present invention. Figure 7 yes Figure 6 The right view. Figure 8 yes Figure 7 A sectional view. Figure 9 yes Figure 8 Local magnification Figure 1 . Figure 10 yes Figure 8 Local magnification Figure 2 . Figure 11 This is a schematic diagram of the end sealing structure of a rotary piston pneumatic motor according to the present invention. Figure 12 yes Figure 11 The main view. Figure 13 yes Figure 11 Rear view. Figure 14 yes Figure 11 A side sectional view. Figure 15 This is a rear view of the front end cover of a rotary piston pneumatic motor according to the present invention. Figure 16 This is a front view of the assembly of the chamber cylinder and the blade rotor of a rotary piston pneumatic motor according to the present invention. Figure 17 This is a rear view of the assembly of the chamber cylinder and the blade rotor of a rotary piston pneumatic motor according to the present invention. Figure 18 This invention relates to the cycloidal equation of the blade rotor of a rotary piston pneumatic motor within the cylinder housing. Figure 19 This is an embodiment diagram of the end sealing structure of a rotary piston pneumatic motor according to the present invention; Figure 20 yes Figure 19 A magnified view of the location of the oil passage. Figure 21 This is an example diagram of a sealing ring. Figure 22 This is an embodiment diagram of the blade rotor.

[0030] In the attached diagram: 1. Cylinder chamber; 2. Front end cover; 3. Rear end cover; 4. End cover connecting screw; 5. End cover connecting nut; 6. Exhaust side eccentric shaft; 7. Eccentric main shaft; 8. Large gear ring; 9. Gear shaft; 10. Rolling bearing one; 11. Elastic retaining ring; 12. Spring radial seal; 13. Spring end seal; 14. Front sealing end cover; 15. Rear sealing end cover; 16. Vane rotor body; 17. Rolling bearing two; 18. Sleeve; 19. Piston end cover; 20. Rolling bearing three; 21. Oil cover; 22. Oil passage; 101. Housing air inlet; 102. Housing exhaust port; 161. Piston exhaust port; 162. Piston exhaust groove; 163. Spring limiting groove. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0032] Please refer to Figures 1 to 22 The diagram illustrates an end-sealing structure for a rotary piston pneumatic motor, comprising: a cylinder housing, a main shaft, and a vane rotor 16. The main shaft is rotatably mounted within the cylinder housing. The main shaft includes: an exhaust-side eccentric shaft 6, an eccentric main shaft 7, and a sleeve 18. The front section of the eccentric main shaft 7 has an eccentric shaft portion, and the rear end of the exhaust-side eccentric shaft 6 is connected to the front end of the eccentric main shaft 7. The front section of the exhaust-side eccentric shaft 6 and the rear section of the eccentric main shaft 7 are located on the same axis. The vane rotor 16 is disposed within the cylinder housing and sleeved on the eccentric shaft portion via the sleeve 18. The vane rotor 16 rotates around the axis of the eccentric shaft portion.

[0033] Furthermore, in a preferred embodiment, the cylinder housing includes: a front end cover 2, a chamber cylinder 1, and a rear end cover 3. The front end of the chamber cylinder 1 is connected to the front end cover 2, and the rear end of the chamber cylinder 1 is connected to the rear end cover 3. Multiple housing air inlets 101 are provided along the circumference of the chamber cylinder 1, and multiple housing exhaust ports 102 are provided on the front end cover 2. The blade rotor 16 is located inside the chamber cylinder 1 and between the front end cover 2 and the rear end cover 3. A piston exhaust groove 162 is provided on the front end face of the blade rotor 16, and a piston exhaust port 161 is provided on the outer wall of the blade rotor 16. The multiple housing air inlets 101 are used to intake air and drive the blade rotor 16 to rotate, thereby driving the main shaft to rotate. The multiple housing exhaust ports 102 are used to exhaust air.

[0034] Furthermore, in a preferred embodiment, the blade rotor body 16 with two petals has two piston exhaust grooves 162 on its front side, and two piston exhaust ports 161 on its outer wall. Each piston exhaust port 161 communicates with a piston exhaust groove 162 and is located at the end edge of the piston exhaust groove 162 in a clockwise direction; Figure 11 As shown;

[0035] Furthermore, in a preferred embodiment, the positional relationship between the inner wall edge of the chamber cylinder 1 and the blade rotor 16 and the inner wall of the chamber cylinder 1 is as follows: Figure 16 and Figure 17 As shown, the blade rotor body 16 is a rotating piston, which cooperates with the cylinder housing. After the air is unidirectionally introduced through the housing air inlet 101, it pushes the blade rotor body 16 to rotate around the front shaft of the eccentric main shaft 7. When the blade rotor body 16 rotates a certain angle, the gas enters the piston exhaust groove 162 through the piston exhaust port 161, and then is discharged through the housing exhaust port 102.

[0036] Furthermore, in a preferred embodiment, the inner edge of the end face of the chamber cylinder 1 is petal-shaped, the end face of the blade rotor 16 is petal-shaped, and the number of petals of the blade rotor 16 is one less than the number of petals of the chamber cylinder 1.

[0037] Furthermore, in a preferred embodiment, it further includes: a gear ring drive structure, which includes: a large gear ring 8 and a gear shaft 9, the gear shaft 9 being connected to the blade rotor body 16 by a key, the large gear ring 8 being installed inside the front end cover 2, and the large gear ring 8 and the gear shaft 9 meshing with each other.

[0038] Furthermore, in a preferred embodiment, since the blade rotor 16 is rotatably mounted on the front section of the eccentric main shaft 1 via the sleeve 18, and the exhaust-side eccentric shaft 6 and the front end cover 2 are meshed and driven by a gear ring transmission structure, with the gear shaft 9 inserted into the front end of the blade rotor 16 and rotating synchronously, the blade rotor 16 is driven to rotate around the front section of the eccentric main shaft 1. The main shaft rotates around the axes of its front and rear ends. Under the action of the gear ring transmission structure, the two rotate in opposite directions. During the rotation of the blade rotor 16, the axial position of the front section of the eccentric main shaft 1 changes continuously, and under the action of the gear ring transmission structure, the main shaft rotates, thereby realizing the function of a rotary piston pneumatic motor. The cycloidal equation of the blade rotor 16 within the cylinder housing is referenced... Figure 18 As shown.

[0039] Furthermore, in a preferred embodiment, the cylinder housing further includes a one-way intake valve, wherein each housing intake port 101 is equipped with a one-way intake valve for communicating with an air passage, and the one-way intake valve is used to enable one-way air intake toward the interior of the chamber cylinder 1.

[0040] Furthermore, in a preferred embodiment, the rear end of the exhaust-side eccentric shaft 6 and the front end of the eccentric main shaft 7 are connected by a key or pin.

[0041] Furthermore, in a preferred embodiment, it further includes: a spring radial seal 12, with multiple spring radial seals 12 installed at equal intervals along the inner wall of the chamber cylinder 1. This structure is superior to the traditional pneumatic motor with the sealing strip mounted on the rotating piston. Specifically, the spring radial seal 12 does not need to rotate with the blade rotor 16, and there is no centrifugal force, which effectively reduces the wear on the chamber cylinder 1. The spring radial seal 12 contains a compression spring to ensure sealing performance.

[0042] Furthermore, in a preferred embodiment, the front section of the exhaust-side eccentric shaft 6 is rotatably mounted in the front end cover 2 via at least one rolling bearing 10; the rear section of the eccentric main shaft 7 is rotatably mounted on the rear end cover 3 via at least one rolling bearing 20.

[0043] Furthermore, in a preferred embodiment, the petal-shaped end face of the blade rotor body 16 has each petal in a smoothly transitioning arc shape that protrudes outward; the number of petals can be 2 to 9.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0045] In addition to the above, the present invention also has the following embodiments:

[0046] In a further embodiment of the present invention, Figure 19 and Figure 20 As shown, the oil cap 21 is closable and installed inside the front end cover 2 to close the oil passage 22 on the front end cover 2. The position of the oil passage 22 is used to inject sealing lubricating oil between the front end cover 2 and the blade rotor body 16 to achieve sealing and pressure maintenance and prevent air leakage. The diameter of the oil passage 22 is 1mm, and it connects to the outer periphery of the spring end seal 13 and the inner wall of the chamber cylinder 1. Preferably, the distance between the outer periphery of the spring end seal 13 and the inner wall of the chamber cylinder 1 is 1mm.

[0047] In a further embodiment of the present invention, the blade rotor body 16 is as follows Figures 11 to 14 and Figure 22 As shown, spring limiting grooves 163 are provided at both the front and rear ends of the blade rotor body 16. The groove depth of the spring limiting groove 163 is preferably 4mm. The spring end seal 13 is composed of an "8"-shaped sealing ring and a corrugated spring. The corrugated spring is placed at the bottom of the spring limiting groove 163, and then the sealing ring is inserted into the spring limiting groove 163. Both the corrugated spring and the sealing ring are matched with the spring limiting groove 163. See the sealing ring for details. Figure 21 As shown, the thickness is preferably 1.2mm. One side of the sealing ring abuts against the corrugated spring at the bottom of the spring limiting groove 163, and the other side of the sealing ring abuts against the front end cover 2 or the rear end cover 3; thus achieving a seal between the cylinder housing and the blade rotor body 16.

[0048] In a further embodiment of the present invention, the spring radial seal 12 is composed of a sealing strip and a corrugated spring. The corrugated spring is located at the bottom of the strip-shaped limiting groove, and the corrugated spring pushes the sealing strip against the outer wall of the blade rotor body 16.

[0049] In a further embodiment of the present invention, the sealing ring and sealing strip may be made of polyetheretherketone (PEEK), which has a glass transition temperature between 143-162°C and possesses high temperature resistance, mechanical strength, wear resistance, chemical corrosion resistance, electrical properties, environmental protection characteristics, and hydrolysis resistance.

[0050] In a further embodiment of the present invention, the rotary piston pneumatic motor of the present invention has a simple structure, is easy to manufacture and assemble, and at the same time reduces the overall size and weight.

[0051] In a further embodiment of the present invention, the rotary piston pneumatic motor of the present invention has a simple structure, is easy to manufacture, is inexpensive, reliable in operation, robust and durable, and has high operating efficiency. It has no slip rings and no carbon brushes, making it more suitable for high-speed operation.

[0052] In a further embodiment of the present invention, the rotary piston pneumatic motor of the present invention has a simple structure, small size, low weight, and is more efficient, making it more suitable for high-speed operation and use in mobile devices.

[0053] In a further embodiment of the present invention, a plurality of spring radial seals 12 are installed at equal intervals along the inner wall of the chamber cylinder 1. The inner wall of the chamber cylinder 1 and the outer wall of the blade rotor 16 are sealed by the plurality of spring radial seals 12 to ensure the stable operation of the rotary piston pneumatic motor.

[0054] In a further embodiment of the present invention, the present invention relates to the technical field of pneumatic motors. The blade rotor 16 is rotatably mounted at an eccentric position on the main shaft. The blade rotor 16 is driven to rotate within the cylinder housing by an external air passage. Specifically, gas is introduced into the cylinder housing through the air passage to drive the blade rotor 16 to rotate. Based on the change in the size of the chamber space formed between the eccentric rotating piston and the cylinder, the internal air intake, compression, and exhaust processes are realized. The main shaft is driven to rotate through a gear transmission structure to realize power output. The present invention has a simple structure, is easy to manufacture, is inexpensive, reliable in operation, robust and durable, and has high operating efficiency, making it more suitable for high-speed operation.

[0055] In a further embodiment of the invention, the cylinder housing and the blade rotor 16 are easily manufactured in simple 2D.

[0056] In a further embodiment of the present invention, the cylinder housing and the blade rotor 16 are coated with ceramic coatings on their inner and outer surfaces to improve wear resistance.

[0057] In a further embodiment of the present invention, a three-chamber rotary piston pneumatic motor is provided, wherein the cycloidal equation of the blade rotor 6 within the cylinder housing is referenced. Figure 18 As shown, the eccentric main shaft 7 and the exhaust-side eccentric shaft 6 are connected and fixed by a key or pin. The cylinder body 1 has a housing air inlet 101 and the front end cover 2 has a housing exhaust port 102, realizing the function of air intake and exhaust of the cylinder housing. After air is introduced into the cylinder housing through the external air passage, the vane rotor 16 rotates on the front shaft of the eccentric main shaft 7. The outer wall of the vane rotor 16 collides and compresses with the inner wall of the cylinder housing, realizing the function of compressed air. The transmission is realized through the gear ring transmission structure. Under the action of the gear shaft 9 and the large gear ring 8, the main shaft is driven to rotate, realizing the output of power. The vane rotor 16 rotates in the opposite direction to the eccentric main shaft 7.

[0058] In a further embodiment of the present invention, each air inlet 21 of the rotary piston pneumatic motor is equipped with a one-way air intake valve for communicating with the air passage. Air is introduced into the cylinder housing through the air passage, driving the vane rotor 6 to rotate. The vane rotor 6 is a rotary piston. The vane rotor 6 and the cylinder housing cooperate with each other, and the cavity between the vane rotor 6 and the cylinder housing is sealed by multiple spring radial seals 8. At the same time, the transmission is based on the gear ring transmission structure 7, and the vane rotor 6 drives the main shaft 5 to rotate. The power is output through the exhaust side eccentric shaft 51; thus realizing the function of the rotary piston pneumatic motor.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. An end sealing structure for a rotary piston pneumatic motor, characterized in that, include: The cylinder housing includes a main shaft and a blade rotor (16). The cylinder housing includes a chamber cylinder (1), a front end cover (2), and a rear end cover (3), which are arranged sequentially from front to back. The front end cover (2), the chamber cylinder (1), and the rear end cover (3) are rotatably connected to the front end cover (2). The rear end cover (3) of the main shaft is rotatably connected to the rear end cover (3). The blade rotor (16) is located inside the chamber cylinder (1) and is sleeved on the main shaft. The inner wall cross-section of the chamber cylinder (1) is petal-shaped, and the outer wall cross-section of the blade rotor (16) is petal-shaped. The outer wall of the blade rotor (16) matches the inner wall of the chamber cylinder (1). The number of petals of the blade rotor (16) is one less than the number of petals of the chamber cylinder (1). It also includes: a spring radial seal (12) and a spring end seal (13). The front and rear end faces of the blade rotor body (16) are provided with spring limiting grooves (163). Each spring limiting groove (163) is equipped with a spring end seal (13). The spring end seal (13) located on the front end face of the blade rotor body (16) abuts against the front end cover (2), and the spring end seal (13) located on the rear end face of the blade rotor body (16) abuts against the rear end cover (3). The inner wall of the chamber cylinder (1) is provided with multiple strip-shaped limiting grooves. Each strip-shaped limiting groove is equipped with a spring radial seal (12). The multiple spring radial seals (12) abut against the outer wall of the blade rotor body (16). The chamber cylinder (1) is provided with a housing air inlet (101); the front end cover (2) is provided with a housing exhaust port (102); the housing air inlet (101) is connected to an external air passage, which is used to drive the blade rotor (16) to rotate in the cylinder housing and thus drive the main shaft to rotate; Each front end cover (2) is provided with the same number of oil passages (22) as the spring radial seals (12). Each oil passage (22) on the front end cover (2) is located at the front end of a spring radial seal (12). The oil passages (22) on the front end cover (2) are used to inject sealing lubricating oil between the front end cover (2) and the blade rotor body (16) to achieve sealing and pressure maintenance. Each of the rear end caps (3) is provided with the same number of oil passages (22) as the spring radial seals (12). Each oil passage (22) on the rear end cap (3) is located at the rear end of a spring radial seal (12). The oil passages (22) on the rear end cap (3) are used to inject sealing lubricating oil between the rear end cap (3) and the blade rotor body (16) to achieve sealing and pressure maintenance.

2. The end sealing structure of the rotary piston pneumatic motor according to claim 1, characterized in that, The cylinder housing also includes: end cap connecting screw (4) and end cap connecting nut (5). The chamber cylinder body (1) is provided with multiple through holes for inserting the end cap connecting screw (4). Each end cap connecting screw (4) has external threads at both the front and rear ends. The front end of each end cap connecting screw (4) passes through the front end cap (2) and is locked and limited by an end cap connecting nut (5). The rear end of each end cap connecting screw (4) passes through the rear end cap (3) and is locked and limited by another end cap connecting nut (5).

3. The end sealing structure of the rotary piston pneumatic motor according to claim 1, characterized in that, The main shaft includes an exhaust-side eccentric shaft (6) and an eccentric main shaft (7). The exhaust-side eccentric shaft (6) has an eccentric shaft insertion slot at its rear end. The front end of the eccentric main shaft (7) and the eccentric shaft insertion slot are connected by a key. The front section of the exhaust-side eccentric shaft (6) and the rear section of the eccentric main shaft (7) are coaxially arranged.

4. The end sealing structure of the rotary piston pneumatic motor according to claim 3, characterized in that, Also includes: Rolling bearing 2 (17), sleeve (18) and piston end cap (19), the front shaft of blade rotor body (16) and eccentric main shaft (7) are rotatably connected by two rolling bearing 2 (17), sleeve (18) is sleeved on the front shaft of eccentric main shaft (7) and located between the two rolling bearing 2 (17), the front and rear ends of sleeve (18) respectively abut against the inner ring of the two rolling bearing 2 (17); piston end cap (19) is sleeved on the front shaft of eccentric main shaft (7) and installed at the rear end of blade rotor body (16), piston end cap (19) is used to limit and seal the rolling bearing 2 (17) located on the rear side.

5. The end sealing structure of the rotary piston pneumatic motor according to claim 4, characterized in that, Also includes: The gear ring drive structure includes a large gear ring (8) and a gear shaft (9). The large gear ring (8) is installed on the rear end face of the front end cover (2). The gear shaft (9) is sleeved on the front section of the eccentric main shaft (7). The outer teeth of the gear shaft (9) mesh with the inner ring of the large gear ring (8). The rear section of the gear shaft (9) has a square cross-section. The rear section of the gear shaft (9) is inserted into the front end of the blade rotor body (16). The blade rotor body (16) is used to drive the gear shaft (9) to rotate synchronously on the eccentric main shaft (7).

6. The end sealing structure of the rotary piston pneumatic motor according to claim 1, characterized in that, The front end of the blade rotor body (16) is provided with multiple piston exhaust grooves (162), and the outer wall of the blade rotor body (16) is provided with multiple piston exhaust ports (161). Each piston exhaust port (161) is connected to a piston exhaust groove (162).

7. The end sealing structure of the rotary piston pneumatic motor according to claim 5, characterized in that, Also includes: Rolling bearing 1 (10) and rolling bearing 3 (20), exhaust side eccentric shaft (6) and front end cover (2) are rotatably connected by rolling bearing 1 (10), and the rear shaft part of eccentric main shaft (7) and rear end cover (3) are rotatably connected by rolling bearing 3 (20).

8. The end sealing structure of the rotary piston pneumatic motor according to claim 7, characterized in that, Also includes: Elastic retaining ring (11) is installed on the exhaust side eccentric shaft (6) to limit the rolling bearing one (10), elastic retaining ring (11) is installed on the front section of the eccentric main shaft (7) to limit the rolling bearing two (17) located on the front side, and elastic retaining ring (11) is installed on the rear section of the eccentric main shaft (7) to limit the rolling bearing three (20).

9. The end sealing structure of the rotary piston pneumatic motor according to claim 7, characterized in that, Also includes: Front sealing end cap (14) and rear sealing end cap (15). The front sealing end cap (14) is installed on the front end face of the front end cap (2) and is used to seal the first rolling bearing (10). The rear sealing end cap (15) is installed on the rear end face of the rear end cap (3) and is used to seal the third rolling bearing (20).

10. A method for sealing the end of a rotary piston pneumatic motor, applicable to the end sealing structure of the rotary piston pneumatic motor according to any one of claims 1 to 9, characterized in that, Each oil passage (22) is used to inject sealing lubricating oil into the cylinder housing. Each spring radial seal (12) has an oil passage (22) at both the front and rear ends. When the outer wall of the blade rotor body (16) is in contact with the inner wall of any petal-shaped cavity of the chamber cylinder body (1), the petal-shaped cavity is a high-pressure cavity. The spring radial seals (12) located on both sides of the high-pressure cavity are injected with sealing lubricating oil at both ends to achieve sealing and pressure retention.

Images