Axial flux motor direct drive disc type rotary valve and application thereof

Abstract

The application belongs to the technical field of fluid control, and discloses an axial flux motor direct-drive disc type rotary valve and application thereof, so as to solve the problems existing in traditional slide valves and rotary valves. The rotary valve comprises a shell, a base is arranged on one side of the shell, a flow distribution end cover is arranged on the other side of the shell, an axial flux motor for driving a main shaft is arranged in the shell, a rotary valve body is further arranged in the shell, a valve body flow channel and a valve body air inlet and exhaust port are arranged on the rotary valve body, a core disc is arranged between the rotary valve body and the flow distribution end cover, a plurality of core disc flow channels are uniformly distributed on the core disc, a first working port and a second working port are arranged on both sides of the flow distribution end cover, and when the core disc rotates, the valve body air inlet port is communicated with the first working port, the second working port is communicated with the valve body second exhaust port, or the valve body air inlet port is communicated with the second working port, and the first working port is communicated with the valve body first exhaust port. The application has the core advantages of excellent anti-pollution ability, wide commutation frequency range and absence of axial and radial unbalanced force, and is suitable for various scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic or pneumatic control technology, in particular to an axial flux motor direct-drive disc rotary valve applicable to motors, oil cylinders and artificial muscle mechanical legs. BACKGROUND

[0002] The traditional rotary valve, such as the rotary valve disclosed in patent CN210317967U, in which the oil distribution shaft rotates in the valve sleeve and is driven by a servo motor through a key, the valve body has four oil ports, and the front end cover has a fifth oil port for leaking oil. This valve has low control accuracy, radial unbalanced force and other problems, and the motor and the valve are radial structures, which results in excessive axial size, which is not conducive to space layout. For example, the double-sided plate type three-position four-way rotary valve with adjustable flow disclosed in patent CN104806592A, in which the valve core is cylindrical, each end has a valve plate, and the valve plate also has eight fan-shaped flow channel through holes. The built-in motor of the valve is placed in the entire valve cavity, which has poor heat dissipation performance and is prone to deformation and friction and wear. For example, the two-position four-way rotary valve disclosed in patent CN105736500A, which uses a spring to press the valve core protrusion against the flow distribution surface to achieve rotation and switching. However, under high pressure, the oil acts on the rotating components to generate significant radial unbalanced force, which not only aggravates wear and "stuck" risk, but also poses a serious challenge to the long-term operation of the sealing reliability. For example, the rotary valve disclosed in patent CN108397571A, in which the valve core lacks bearing support and relies on the valve body hole wall or sealing ring, which is prone to dry friction; in addition, the overturning moment generated by the asymmetric oil cavity at the bottom of the valve core further worsens the end face friction condition, resulting in shortened service life.

[0003] In summary, the traditional rotary valve has the following disadvantages:

[0004] 1. Significant negative impact of radial force: High-pressure oil acting on asymmetric rotating components generates a large radial force, aggravating wear and sticking risk and increasing sealing pressure.

[0005] 2. Limited by sealing elements: Under long-term high-speed rotation, the sealing surface will be worn due to friction, leading to gradual performance degradation.

[0006] 3. High risk of sticking and wear: Small contaminants can accelerate the damage to the sealing surface, and under high pressure, the risk of external leakage increases significantly.

[0007] 4. Unbalanced axial force easily causes end face instability and leakage, reducing the reliability of the valve. SUMMARY

[0008] The application aims to solve the technical problems existing in the prior art reversing valve (direction changing valve) and provides an axial flux motor direct-drive disc type reversing valve.

[0009] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0010] The axial flux motor direct-drive disc type reversing valve comprises a shell, a base is arranged on one side of the shell, a flow distribution end cover is arranged on the other side of the shell, a main shaft is arranged between the flow distribution end cover and the base, an axial flux motor for driving the main shaft to rotate is arranged on the side of the shell close to the base, a reversing valve body is arranged on the side of the shell close to the flow distribution end cover, a plurality of valve body flow channels are arranged on the reversing valve body in the circumferential direction, a valve body air inlet, a valve body first air outlet and a valve body second air outlet which are in communication with corresponding valve body flow channels and correspond to a shell air inlet and outlet arranged on the shell are arranged on the reversing valve body in the radial direction, a core disc which rotates integrally with the main shaft is clamped between the reversing valve body and the flow distribution end cover, a plurality of through core disc flow channels are arranged on the core disc, first and second working ports are arranged on the two sides of the flow distribution end cover, the first and second working ports are in communication with end cover flow channels arranged on the flow distribution end cover in a corresponding manner, and when the core disc rotates, the valve body air inlet is in communication with the first working port, the second working port is in communication with the valve body second air outlet, or the valve body air inlet is in communication with the second working port, and the first working port is in communication with the valve body first air outlet.

[0011] Further, the axial flux motor comprises a first armature and a second armature which are mounted on the main shaft, a stator is arranged between the first armature and the second armature, the first armature and the second armature are each provided with a first electromagnet and a second electromagnet on the side close to the stator, a coil is wound on the stator, a wire is connected to the coil, the wire passes through a coil interface fixing support and the shell to connect to an external power supply, and the coil interface fixing support is limited and clamped by a support frame arranged in the shell.

[0012] Further, a stator support is arranged on the stator, and the stator support is connected in the shell by a second set screw.

[0013] Further, the first armature and the second armature are connected by a first set screw, and the first armature and the second armature are connected to the main shaft by a spline, the side surface of the first armature is limited by a shaft check ring mounted on the main shaft, and the side surface of the second armature is limited by a shoulder arranged on the main shaft.

[0014] Further, a second sink groove for mounting the core disc is arranged on the flow distribution end cover, and the flow channel width and the pitch circle radius of the core disc flow channels on the core disc and the end cover flow channels on the flow distribution end cover are the same.

[0015] Further, axial flow channels which are in communication with the valve body flow channels and correspond to the core disc flow channels are arranged at the two ends of each valve body flow channel.

[0016] Further, the main shaft is provided with a first cylindrical bearing at the installation position of the main shaft and the distribution end cover, and a second cylindrical bearing at the installation position of the main shaft and the base.

[0017] Further, the main shaft is connected with the core disc through a spline.

[0018] Further, the shell is provided with a first O-shaped sealing ring at the installation position of the shell and the distribution end cover, and a second O-shaped sealing ring and a third O-shaped sealing ring at the installation position of the shell and the two sides of the valve body.

[0019] Further, the shell air inlet and air outlet include a shell air inlet corresponding to the valve body air inlet, a shell first air outlet corresponding to the valve body first air outlet, and a shell second air outlet corresponding to the valve body second air outlet, and the valve body air inlet, the valve body first air outlet, and the valve body second air outlet have the same inner diameter and coaxial installation with the shell air inlet, the shell first air outlet, and the shell second air outlet.

[0020] The axial flux motor direct-drive disc type rotary valve can also be applied to a motor or a cylinder or an artificial muscle mechanical leg.

[0021] Compared with the prior art, the axial flux motor direct-drive disc type rotary valve has the following beneficial effects:

[0022] Compared with the conventional axial motion spool valve, the axial flux motor direct-drive disc type rotary valve has the advantages of high reliability, high upper limit of switching frequency, compact layout, and easy realization of intelligence. In the fields of high-tech such as robots, high-end medical devices, and analytical instruments, it becomes a key basic component for realizing precise motion and control. The axial flux motor direct-drive disc type rotary valve can efficiently replace the conventional axial motion spool valve in combination with the characteristics of a pneumatic valve. The axial flux motor direct-drive disc type rotary valve adopts a design of directly driving a valve element by a motor, and precise switching of a rotary disc type switching valve can be realized by accurately controlling the rotation angle of the motor. By adjusting the rotation speed of the driving motor, the switching frequency of the rotary valve can be accurately controlled, thereby becoming an excellent alternative scheme of the existing high-frequency response proportional valve.

[0023] The axial flux motor direct-drive disc type rotary valve has the core advantages of excellent anti-pollution ability, wide switching frequency range, and absence of axial and radial unbalanced force, and is suitable for various high-end application scenarios, especially in the field of hydraulic or pneumatic robots, and has great potential to replace the conventional spool type switching valve.

[0024] The integrated design of the motor and the valve greatly saves the equipment installation space, is especially beneficial for application scenarios with limited space, and fundamentally solves the problems of vibration, noise, and additional wear caused by the conventional separated design. The integrated design of the motor and the valve reduces external mechanical connecting parts, reduces potential failure points, has better overall sealing, and can better prevent the influence of the external environment on the internal motor and transmission mechanism. The integrated design structure is more compact, can realize more accurate flow regulation and rapid response control.

[0025] The core disc adopts a low rotational inertia design, is convenient for direct driving of a motor, valve flow size control is realized through control of the core disc angle, and then speed and reversing frequency control is realized.

[0026] The core disc uniform rotation mode is adopted, the twice acceleration and deceleration links of the spool in the slide valve reversing process are replaced, the reversing speed is accurately controlled through adjustment of the rotation frequency of the core disc, and the reversing response speed is further improved.

[0027] The radial hydraulic pressure imbalance problem of the circumferential slot rotary valve is effectively solved, and the radial imbalance force generated due to the asymmetric distribution of oil ports of the traditional rotary valve is fundamentally eliminated.

[0028] The core disc flow channel is designed as a through groove, the generation of additional axial force is avoided, end face friction is effectively reduced, the service life of the moving part is improved, and the problem that the end face friction force of the existing rotary valve is too large due to the groove formed on the axial end face is solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural section view of the application;

[0030] Figure 2 It is a vertical section view of the application; Figure 1

[0031] Figure 3 It is an axonometric view of the application;

[0032] Figure 4 It is a front view of the flow distribution end cover of the application;

[0033] Figure 5 It is a front view of the core disc of the application;

[0034] Figure 6 It is a front view of the rotary valve body of the application;

[0035] Figure 7 It is a front view of the main shaft of the application;

[0036] Figure 8 It is an axonometric view of the housing of the application;

[0037] Figure 9 It is an exploded view of the axial flux motor direct drive disc rotary valve of the application;

[0038] Figure 10 It is a flow channel schematic view of the application, wherein Figure 10 (a) is an end cover flow channel schematic view; Figure 10 (b) is a core disc flow channel schematic view; Figure 10 (c) is a valve body flow channel schematic view; ​

[0039] Figure 11 The flow distribution and function schematic diagram of the application;

[0040] Figure 12 The principle diagram of the axial flux motor direct drive disc rotary valve control mechanical leg of the application.

[0041] The meaning of the reference signs is as follows: 1. housing; 2. first armature; 3. coil interface fixing support; 4. wire; 5. support frame; 6. second armature; 7. second O-shaped sealing ring; 8. first O-shaped sealing ring; 9. third O-shaped sealing ring; 10. core disc; 101. inner spline; 102. core disc flow channel; 11. main shaft; 111. third sink groove; 112. first outer spline; 113. second outer spline; 12. first cylindrical bearing; 13. rotary valve body; 131. valve body flow channel; 132. axial flow channel; 14. flow distribution end cover; 141. end cover flow channel; 142. first sink groove; 143. second sink groove; 15. first set screw; 16. second set screw; 17. first electromagnet; 18. second electromagnet; 19. coil; 20. stator; 201. stator support; 21. third set screw; 22. base; 23. shaft check ring; 24. second cylindrical bearing; 25. fourth set screw; A. first working port; B. second working port; P. valve body air inlet; EA. valve body first exhaust port; EB. valve body second exhaust port; P1. housing air inlet; EA1. housing first exhaust port; EB1. housing second exhaust port; M1. first muscle; M2. second muscle; M3. joint shaft. DETAILED DESCRIPTION

[0042] The application will be further described below in combination with the drawings.

[0043] As Figures 1-11 shown, the axial flux motor direct drive disc rotary valve comprises a housing 1, the housing 1 is fastened with a base 22 on one side through a plurality of third set screws 21 evenly distributed, the housing 1 is fastened with a flow distribution end cover 14 on the other side through a plurality of fourth set screws 25 evenly distributed, and the housing 1 is provided with a first O-shaped sealing ring 8 at the installation position of the flow distribution end cover 14. A main shaft 11 is arranged between the flow distribution end cover 14 and the base 22, the main shaft 11 is provided with a first cylindrical bearing 12 at the installation position of the flow distribution end cover 14 (a first sink groove 142 is formed on the flow distribution end cover 14 for installing the first cylindrical bearing 12), and the main shaft 11 is provided with a second cylindrical bearing 24 at the installation position of the base 22 (a sink hole is formed on the base 22 for installing the second cylindrical bearing 24).

[0044] An axial magnetic flux motor is arranged in the shell 1 near one side of the base 22 for driving the rotation of the main shaft 11, the axial magnetic flux motor comprises a first armature 2 and a second armature 6 mounted on the main shaft 11, the first armature 2 is connected with the second armature 6 through a plurality of first tight screws 15 uniformly distributed, and the first armature 2 and the second armature 6 are connected with the main shaft 11 through spline transmission, the side surface of the first armature 2 is limited by the shaft check ring 23 mounted on the main shaft 11, and the side surface of the second armature 6 is limited by the shoulder arranged on the main shaft 11 (the specific connection mode is that the third sink groove 111 is arranged on the main shaft 11, the shaft check ring 23 is arranged in the third sink groove 111, and the first outer spline 112 is arranged on the main shaft 11 at the positions where the first armature 2 and the second armature 6 are mounted). The first armature 2 and the second armature 6 are provided with a stator 20, the stator 20 is provided with a stator support 201, the stator support 201 is connected in the shell 1 through a plurality of second tight screws 16 to assist in fixing the position of the stator 20. The first armature 2 and the second armature 6 are provided with a first electromagnet 17 and a second electromagnet 18 on the side close to the stator 20, the first electromagnet 17 and the second electromagnet 18 are two levels of magnets, and are uniformly overlapped on the inner side of the first armature 2 and the second armature 6. The stator 20 is wound with a coil 19, the coil 19 is connected with a wire 4, the wire 4 is connected with a power supply after penetrating through a coil interface fixing support 3 and three holes reserved on the shell 1, the coil interface fixing support 3 is limited and clamped by the support frame 5 arranged in the shell 1, and the support frame 5 is fixedly installed on the inner wall of the shell 1 (screw fastening or adhesive fixing).

[0045] A rotary valve valve body 13 is arranged in the shell 1 near the distribution end cover 14, second O-shaped sealing rings 7 and third O-shaped sealing rings 9 are arranged on both sides of the shell 1 and the rotary valve valve body 13, the rotary valve valve body 13 is provided with sealing ring sink grooves, and the sizes of the sealing ring sink grooves are matched with the sizes of the second O-shaped sealing rings 7 and the third O-shaped sealing rings 9. The rotary valve valve body 13 is uniformly provided with three valve body flow channels 131 in the circumferential direction, and each valve body flow channel 131 is provided with an axial flow channel 132 communicated with the valve body flow channel 131 at both ends. The rotary valve valve body 13 is uniformly provided with a valve body air inlet P, a valve body first air outlet EA and a valve body second air outlet EB communicated with corresponding valve body flow channels 131 and corresponding to shell air inlets and outlets arranged on the shell 1 in the radial direction, the shell air inlets and outlets include a shell air inlet P1 corresponding to the valve body air inlet P, a shell first air outlet EA1 corresponding to the valve body first air outlet EA, and a shell second air outlet EB1 corresponding to the valve body second air outlet EB, and the valve body air inlet P, the valve body first air outlet EA and the valve body second air outlet EB have the same inner diameter and are coaxially installed with the shell air inlet P1, the shell first air outlet EA1 and the shell second air outlet EB1.

[0046] A core disk 10, which rotates integrally with the main shaft 11, is sandwiched between the valve body 13 and the distribution end cover 14. (A second external spline 113 is provided at the location where the core disk 10 is mounted on the main shaft 11, and an internal spline 101 that mates with the second external spline 113 is provided on the core disk 10.) The distribution end cover 14 is provided with a second recess 143 for mounting the core disk 10. Three through-type core disk flow channels 102 are evenly distributed on the core disk 10. The core disk flow channels 102 are connected to or closed with the valve body flow channel 131 through an axial flow channel 132. The distribution end cover 14 is symmetrically provided with a first working port A and a second working port B on both sides. The first working port A and the second working port B are connected to the end cover flow channels 141 correspondingly provided on the distribution end cover 14. The flow channel width and pitch circle radius of the core disk flow channel 102 on the core disk 10 and the end cover flow channel 141 on the distribution end cover 14 are the same. When the core disk 10 rotates, it connects the valve body air inlet P with the first working port A and the second working port B with the valve body second exhaust port EB, or it connects the valve body air inlet P with the second working port B and the first working port A with the valve body first exhaust port EA.

[0047] The working process of this invention is as follows:

[0048] Connect the housing air inlet P1 (corresponding to the valve body air inlet P), the first working port A and the second working port B to the circuit. Connect the housing first exhaust port EA1 (corresponding to the valve body first exhaust port EA) and the housing second exhaust port EB1 (corresponding to the valve body second exhaust port EB) to the circuit or directly discharge air according to specific requirements.

[0049] After the axial flux motor is energized, the rotor structure, composed of the first armature 2, the second armature 6, the first electromagnet 17, and the second electromagnet 18, drives the main shaft 11 to rotate via the first external spline 112. This, in turn, drives the core disk 10 to rotate via the second external spline 113 on the main shaft 11. When the core disk 10 rotates a certain angle, it connects the valve body inlet P with the first working port A and the second working port B with the valve body's second exhaust port EB (i.e., the housing inlet P1 connects with the first working port A and the second working port B connects with the second housing exhaust port EB1). The core disk 10 continues to rotate until the valve body inlet P connects with the second working port B and the first working port A connects with the valve body's first exhaust port EA (i.e., the housing inlet P1 connects with the second working port B and the first working port A connects with the housing's first exhaust port EA1), repeating this cycle to control the axial flux motor's direct-drive disc valve. This invention can precisely control the switching frequency of the rotary valve by adjusting the rotation speed of the flux motor, thus becoming an excellent alternative to existing high-frequency response proportional valves.

[0050] The axial flux motor direct-drive disc rotary valve of the present invention can be applied to motors, hydraulic cylinders, or artificial muscle mechanical legs, etc.

[0051] like Figure 12The figure is a schematic diagram of the valve-controlled artificial muscle mechanical leg of the present application, taking a pneumatic artificial muscle mechanical leg as an example.

[0052] The first muscle M1 is connected to the first working port A, and the second muscle M2 is connected to the second working port B. When the valve inlet P is communicated with the first working port A and the second working port B is communicated with the second valve outlet EB, the first muscle M1 is stretched after receiving high-pressure gas, and the second muscle M2 is contracted after the gas in the second muscle M2 is rapidly discharged through the second valve outlet EB, thereby driving the mechanical leg thigh to rotate around the joint axis M3 and switching the mechanical leg thigh from the bent state to the stretched state.

[0053] When the core disc 10 continues to rotate, the valve inlet P is communicated with the second working port B and the first working port A is communicated with the first valve outlet EA. The second muscle M2 is stretched after receiving high-pressure gas, and the first muscle M1 is contracted after the gas in the first muscle M1 is rapidly discharged through the first valve outlet EA, thereby driving the mechanical leg thigh to rotate reversely around the joint axis M3 and switching the mechanical leg thigh from the stretched state to the bent state.

[0054] Figure 12 Only the thigh part of the mechanical leg is shown, which is controlled by a disc valve, and the lower leg is controlled by another disc valve, and the principle is the same as above.

Claims

1. Axial flux motor direct drive disc type rotary valve, comprising a shell (1), a base (22) is arranged on one side of the shell (1), a flow distribution end cover (14) is arranged on the other side of the shell (1), and a main shaft (11) is arranged between the flow distribution end cover (14) and the base (22), characterized in that: The shell (1) is provided with an axial magnetic flux motor near the base (22) for driving the rotation of the main shaft (11), the axial magnetic flux motor comprises a first armature (2) and a second armature (6) mounted on the main shaft (11), a stator (20) is arranged between the first armature (2) and the second armature (6), the first armature (2) and the second armature (6) are connected with the main shaft (11) through spline connection, the first armature (2) and the second armature (6) are provided with a first electromagnet (17) and a second electromagnet (18) on the side close to the stator (20), the stator (20) is wound with a coil (19), the coil (19) is connected with a wire (4), the wire (4) is connected with a power supply after penetrating through a coil interface fixing support (3) and the shell (1), and the coil interface fixing support (3) is clamped and limited by a support frame (5) arranged in the shell (1). The shell (1) is provided with a rotary valve body (13) near the distribution end cover (14), a plurality of valve body flow channels (131) are uniformly arranged on the rotary valve body (13) in the circumferential direction, a valve body air inlet (P), a valve body first air outlet (EA) and a valve body second air outlet (EB) are uniformly arranged on the rotary valve body (13) in the radial direction and are communicated with the corresponding valve body flow channels (131) and the shell air inlet and outlet arranged on the shell (1), the rotary valve body (13) and the distribution end cover (14) are clamped with a core disc (10) which rotates integrally with the main shaft (11), a plurality of through core disc flow channels (102) are uniformly arranged on the core disc (10), both ends of each valve body flow channel (131) are provided with an axial flow channel (132) which is communicated with the valve body flow channel (131) and corresponds to the core disc flow channel (102), the distribution end cover (14) is provided with a first working port (A) and a second working port (B) on both sides, the first working port (A) and the second working port (B) are communicated with the end cover flow channel (141) arranged on the distribution end cover (14), and when the core disc (10) rotates, the valve body air inlet (P) is communicated with the first working port (A), the second working port (B) is communicated with the valve body second air outlet (EB), or the valve body air inlet (P) is communicated with the second working port (B), and the first working port (A) is communicated with the valve body first air outlet (EA).

2. The axial flux motor direct drive disc rotary valve of claim 1, wherein: The stator (20) is provided with a stator support (201) which is connected in the shell (1) through a second set screw (16).

3. The axial flux motor direct drive disc rotary valve of claim 2, wherein: The first armature (2) and the second armature (6) are connected through a first set screw (15), and the side surface of the first armature (2) is limited by a shaft retaining ring (23) mounted on the main shaft (11), and the side surface of the second armature (6) is limited by a shoulder arranged on the main shaft (11).

4. The axial flux motor direct drive disc rotary valve of claim 3, wherein: The distribution end cover (14) is provided with a second sink groove (143) for mounting the core disc (10), and the flow channel width and the pitch circle radius of the core disc flow channel (102) on the core disc (10) and the end cover flow channel (141) on the distribution end cover (14) are the same.

5. The axial flux motor direct drive disc rotary valve of claim 4, wherein: The main shaft (11) is equipped with a first cylindrical bearing (12) at the installation position of the distribution end cover (14), and the main shaft (11) is equipped with a second cylindrical bearing (24) at the installation position of the base (22).

6. The axial flux motor direct drive disc rotary valve of claim 1, wherein: The main shaft (11) is connected with the core disc (10) through a spline; the shell (1) is equipped with a first O-shaped sealing ring (8) at the installation position of the distribution end cover (14); the shell (1) is equipped with a second O-shaped sealing ring (7) and a third O-shaped sealing ring (9) at the installation positions of the two sides of the rotary valve valve body (13).

7. The axial flux motor direct drive disc rotary valve of claim 1, wherein: The shell air inlet and exhaust port comprises a shell air inlet (P1) corresponding to the valve body air inlet (P), a shell first exhaust port (EA1) corresponding to the valve body first exhaust port (EA), and a shell second exhaust port (EB1) corresponding to the valve body second exhaust port (EB), and the valve body air inlet (P), the valve body first exhaust port (EA), and the valve body second exhaust port (EB) have the same inner diameter and coaxial installation with the shell air inlet (P1), the shell first exhaust port (EA1), and the shell second exhaust port (EB1).

8. Use of an axial flux electric machine direct drive disc rotary valve according to any one of claims 1 to 7, characterized in that: The axial flux motor direct-drive disc rotary valve is applied to a motor or an oil cylinder or an artificial muscle mechanical leg.

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