A valve sleeve rotation guide control valve spool axial sliding type electro-hydraulic proportional servo valve

Abstract

This invention provides a valve sleeve rotary pilot-controlled axial sliding electro-hydraulic proportional servo valve, comprising a valve body, a valve core installed within the valve body, and a valve sleeve disposed outside the valve core. An external rotor motor is connected to the side of the valve body. The valve sleeve and valve core extend into the inner cavity of the external rotor motor. The external rotor motor is coaxially arranged with the valve sleeve, and its outer rotor is fixedly connected to the valve sleeve, enabling the outer rotor to drive the valve sleeve to rotate. A rotation limiting component is connected between the end of the valve core extending into the inner cavity of the external rotor motor and the housing of the external rotor motor, ensuring that the valve core can only move axially within the valve sleeve. This invention eliminates this transmission mechanism component in the prior art, reducing frictional losses during servo valve operation and improving the motion accuracy and control performance of the servo valve.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic proportional servo valve technology, specifically to an axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core. Background Technology

[0002] Aircraft and military equipment place high demands on the speed and dynamic accuracy of control systems. To meet these requirements, electro-hydraulic servo valves have emerged. They receive analog electrical control signals and output corresponding analog flow rates and / or pressures, responding rapidly. Servo valves offer significant advantages in precision control, dual-degree-of-freedom control, rapid response, high sensitivity, strong anti-contamination capabilities, and remote control.

[0003] In existing technologies, the electro-mechanical converter (stepper motor, servo motor) and the valve core are mostly connected by a transmission mechanism, such as the two-dimensional electro-hydraulic servo valve based on a dual-redundancy transmission mechanism (CN116498786A) and the two-dimensional electro-hydraulic servo valve directly driven by an eccentric shaft motor (CN115653958A). Although the transmission mechanism can amplify the torque output by the electro-mechanical converter, giving the valve core a greater driving torque, it also results in significant friction between components during operation, leading to substantial wear over long-term use. This wear of the transmission mechanism has various adverse effects on the valve core's movement, such as unstable movement, increased energy consumption, reduced motor lifespan, and impaired valve control performance.

[0004] First, poor fit of components in the transmission mechanism can cause unstable valve core movement. Second, as the transmission mechanism wears down, its frictional resistance increases. This means the motor needs to consume more energy to drive the valve core. This not only increases energy consumption but also causes the motor to overheat, thus reducing its lifespan. Furthermore, wear can reduce the valve core's positional accuracy. Over long-term use, wear will cause the valve core to gradually deviate from its correct position, affecting the valve's control performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a valve sleeve rotary pilot-controlled axial sliding electro-hydraulic proportional servo valve. This invention eliminates this transmission mechanism component in existing technologies, reducing frictional losses during servo valve operation and improving the motion accuracy and control performance of the servo valve.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] A valve sleeve rotary pilot-controlled axial sliding electro-hydraulic proportional servo valve includes a valve body, a valve core installed in the valve body, and a valve sleeve disposed outside the valve core. The valve body is characterized by: an external rotor motor connected to the side of the valve body; the valve sleeve and valve core extending into the inner cavity of the external rotor motor; the external rotor motor and valve sleeve being coaxially arranged, and the outer rotor of the external rotor motor being fixedly connected to the valve sleeve; and a rotation limiting component connecting the end of the valve core extending into the inner cavity of the external rotor motor to the housing of the external rotor motor.

[0008] Furthermore: the external rotor motor includes a stator assembly and an external rotor coaxially sleeved on the outside of the valve sleeve in sequence; the external rotor has a rotating sleeve, the rotating sleeve includes an annular sidewall and an annular base connected to the valve sleeve, multiple ribs are connected between the annular base and the annular sidewall, and a positioning pin is provided between the annular base and the valve sleeve.

[0009] Furthermore: the housing includes a cover and a connecting member integrally formed with the cover. The connecting member is inserted into the valve sleeve. The end of the connecting member inserted into the valve sleeve is connected to the valve core inside the valve sleeve. The rotation limiting member is provided between the end and the valve core. The end abuts against the concentric ring sleeved on the valve core.

[0010] Furthermore: the connecting member is provided with a bearing connecting part, and a first thrust bearing is sleeved on the outer periphery of the bearing connecting part, and the two side walls of the first thrust bearing abut against the inner wall of the cover and the outer rotor, respectively.

[0011] Furthermore: the connecting member is provided with a sealing connection part, and a sealing ring is fitted around the outer periphery of the sealing connection part of the connecting member, and the sealing ring is located between the connecting member and the valve sleeve.

[0012] Furthermore: the end of the connecting member has a first mounting groove that mates with the valve core, the rotating limiting member is fixed to the bottom of the first mounting groove, the valve core is provided with a second mounting groove that matches the rotating limiting member, and the valve core is slidably connected to the rotating limiting member; there is a stroke distance between the valve core and the bottom of the first mounting groove and between the rotating limiting member and the bottom of the second mounting groove for the valve core to move axially.

[0013] Furthermore: the valve body is connected to a hydraulic interface plate on the side away from the external rotor motor, and a sensitive cavity sealing element is provided in the inner cavity of the valve body on the side of the hydraulic interface plate, the sensitive cavity sealing element abutting against the valve sleeve.

[0014] Furthermore: the sensitive cavity sealing component includes a T-shaped plug and a second thrust bearing. The second thrust bearing is sleeved on the protruding end of the T-shaped plug and abuts against the valve sleeve. The function of the second thrust bearing is to allow the valve sleeve to rotate.

[0015] Furthermore, the rotation limiting member is configured as a right prism-shaped component with a polygonal bottom surface.

[0016] Furthermore, the valve core has a flow channel inside, and a valve core plug is provided at the end of the flow channel away from the external rotor motor.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] The external rotor motor used in this invention has the advantage of higher torque compared to the internal rotor motor. The external rotor motor can generate a larger starting torque, directly driving the valve sleeve to rotate, thereby driving the valve core to produce axial movement. In this invention, the rotor of the external rotor motor is directly connected to the valve sleeve, reducing the transmission mechanism required in existing technologies, improving the motor's response speed, and reducing frictional losses during the operation of the servo valve.

[0019] In this invention, the outer rotor of the external rotor motor directly drives the valve sleeve to rotate, thereby driving the valve core to generate axial movement, achieving the driving and control of the valve core. This design decouples the degrees of freedom of the two-dimensional servo valve in the prior art, making control easier, more efficient, and more precise. This invention can monitor the axial displacement of the valve core in real time simply by detecting the rotation angle of the outer rotor, thus achieving precise control of fluid flow and pressure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0021] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0022] Figure 3 yes Figure 2 A magnified view of a section at point A;

[0023] Figure 4 This is a schematic diagram of the rotating sleeve of the present invention;

[0024] Figure 5 This is a typical cross-sectional schematic diagram of the housing of the present invention;

[0025] Figure 6 This is a cross-sectional view of the valve sleeve of the present invention;

[0026] Figure 7 This is a typical cross-sectional schematic diagram of the valve sleeve of the present invention;

[0027] Figure 8 This is a schematic diagram of the valve core structure of the present invention;

[0028] Figure 9 This is a structural schematic diagram of the rotation limiting component.

[0029] Reference numerals: 1-Valve body; 2-Valve core; 3-Valve sleeve; 4-Outer rotor motor; 5-Outer rotor; 6-Housing shell; 7-Rotation limiting component; 8-Stator assembly; 9-Rotating sleeve; 10-Magnet; 11-Annular sidewall; 12-Annular base; 13-Rib plate; 14-Positioning pin; 15-Cover; 16-Connecting component; 17-Concentric ring; 18-Bearing connection; 19-First thrust bearing; 20-Sealing connection; 21-Sealing ring; 22-First assembly groove; 23-Second assembly groove; 24-Hydraulic interface plate; 25-T-type plug; 26-Second thrust bearing; 27-Flow channel; 28-Valve core plug; 29-High pressure hole; 30-Low pressure hole; 31-Sensitive chamber channel; 32-Sensitive chamber; 33-High pressure chamber; 34-Shoulder; 35-Support. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0032] like Figures 1 to 3 As shown, an axial sliding electro-hydraulic proportional servo valve with a valve sleeve rotation control valve core includes a valve body 1, a valve core 2 installed inside the valve body 1, and a valve sleeve 3 disposed outside the valve core 2. An external rotor motor 4 is connected to the side of the valve body 1. The valve sleeve 3 and the valve core 2 extend into the inner cavity of the external rotor motor 4. The external rotor motor 4 is coaxially arranged with the valve sleeve 3, and the external rotor 5 of the external rotor motor 4 is fixedly connected to the valve sleeve 3. The external rotor 5 can drive the valve sleeve 3 to rotate. A rotation limiting member 7 is connected between the end of the valve core 2 that extends into the inner cavity of the external rotor motor 4 and the housing 6 of the external rotor motor 4. The rotation limiting member 7 ensures that the valve core 2 can only move axially within the valve sleeve 3.

[0033] The external rotor motor 4 includes a stator assembly 8 and an external rotor 5 coaxially sleeved on the outside of the valve sleeve 3 in sequence; the valve body 1 has a support portion 35 extending into the inner cavity of the external rotor motor 4, and the support portion 35 can provide support for the stator assembly 8.

[0034] like Figure 4As shown, the outer rotor 5 has a rotating sleeve 9 and multiple sets of magnets 10 disposed between the rotating sleeve 9 and the stator assembly 8. The rotating sleeve 9 includes an annular sidewall 11 and an annular base 12 connected to the valve sleeve 3. Multiple ribs 13 are connected between the annular base 12 and the annular sidewall 11. The ribs 13 provide support for the annular base 12 and the annular sidewall 11, while also ensuring the heat dissipation function of the outer rotor motor 4. A positioning pin 14 is provided between the annular base 12 and the valve sleeve 3. The rotating sleeve 9 is fixedly connected to the valve sleeve 3 through the annular base 12. By setting the positioning pin 14, the positioning of the outer rotor 5 and the valve sleeve 3 can be accurately ensured during the installation of the servo valve, improving the accuracy of the servo valve; it also avoids the repeated zeroing work of the relative position of the valve core 2 and the valve sleeve 3 during the subsequent operation of the servo valve.

[0035] like Figure 5 As shown, the housing 6 includes a cover 15 and a connecting member 16 integrally formed with the cover 15. The cover 15 is connected to the valve body 1 by multiple bolts. The connecting member 16 is partially inserted into the valve sleeve 3. The end of the connecting member 16 inserted into the valve sleeve 3 is connected to the valve core 2 inside the valve sleeve 3. The rotation limiting member 7 is provided between the end and the valve core 2. The end abuts against the concentric ring 17 sleeved on the valve core 2.

[0036] The connecting member 16 is provided with a bearing connecting part 18, and a first thrust bearing 19 is sleeved on the outer periphery of the bearing connecting part 18. The two side walls of the first thrust bearing 19 abut against the inner wall of the cover 15 and the outer rotor 5, respectively.

[0037] The connecting member 16 is provided with a sealing connection part 20, and a sealing ring 21 is fitted around the outer periphery of the sealing connection part 20. The sealing ring 21 is located between the connecting member 16 and the valve sleeve 3. The external rotor motor 4 used in this invention is a dry motor. By setting the sealing ring 21, it is possible to prevent the hydraulic oil in the valve body 1 from leaking into the inner cavity of the external rotor motor 4 and contaminating the motor.

[0038] The end of the connecting member 16 has a first mounting groove 22 that mates with the valve core 2. The rotation limiting member 7 is fixed to the bottom of the first mounting groove 22. The valve core 2 is provided with a second mounting groove 23 that matches the rotation limiting member 7. The valve core 22 and the rotation limiting member 7 are slidably connected. There is a stroke distance L between the valve core 2 and the bottom of the first mounting groove 22, and between the rotation limiting member 7 and the bottom of the second mounting groove 23, for the valve core 2 to move axially.

[0039] The valve body 1 is connected to the hydraulic interface plate 24 on the side away from the external rotor motor 4. A sensitive cavity sealing element is provided in the inner cavity of the valve body 1 on the side of the hydraulic interface plate 24, and the sensitive cavity sealing element abuts against the valve sleeve 3.

[0040] The sensitive cavity sealing component includes a T-shaped plug 25 and a second thrust bearing 26. The second thrust bearing 26 is sleeved on the protruding end of the T-shaped plug 25 and abuts against the valve sleeve 3. The first thrust bearing 19 and the second thrust bearing 26 are special bearings capable of withstanding the axial force of the valve sleeve 3, used to bear the axial load of the valve sleeve 3. In this application, the thrust bearing is used to support and control the axial force when the valve sleeve 3 rotates.

[0041] The rotation limiting member 7 is configured as a right prism-shaped component with a polygonal base, such as... Figure 9 In this embodiment, the rotation limiting member 7 is a hexagonal prism-shaped component.

[0042] The valve core 2 has a flow channel 27 inside, and a valve core plug 28 is provided at the end of the flow channel 27 away from the external rotor motor 4.

[0043] A shoulder 34 is provided on the valve core 2. The shoulder 34, the concentric ring 17, and the valve sleeve 3 work together to form a high-pressure chamber 33. The T-shaped plug 25, the valve sleeve 3, the valve core 2, and the valve core plugging member 28 work together to form a sensitive chamber 32.

[0044] like Figure 2 , 6 As shown in Figures 7 and 8, the valve sleeve 3 and valve body 1 are sequentially provided with ports P, A, T, B, and P in the axial direction. Port P is the system pressure port, ports A and B are the working oil ports, and port T is the return oil pressure port. A sensitive cavity channel 31 is provided on the valve sleeve 3, and a high-pressure port 29 and a low-pressure port 30 are provided on the valve core 2. The sensitive cavity channel 31 forms variable throttling orifices with the high-pressure port 29 and the low-pressure port 30, respectively. The high-pressure port 29 and the low-pressure port 30 communicate with the sensitive cavity 32 inside the valve body 1 through the sensitive cavity channel 31. The two variable throttling orifices are connected in series to form a resistance half-bridge, thereby controlling the pressure in the sensitive cavity 32.

[0045] like Figure 2 As shown, when there is no control signal from the external rotor motor, valve core 2 is in the zero position, and the intersection area of ​​high-pressure port 29 and low-pressure port 30 with the sensitive cavity channel 31 is the same. The pressure at the left end of valve core 2 is half of the system pressure P, while the pressure at the right end is constant at P. The effective area of ​​high-pressure cavity 33 in valve body 1 is only half the area of ​​sensitive cavity 32, and valve core 2 is in the equilibrium position.

[0046] The external rotor motor receives a control signal and controls the external rotor 5 to drive the valve sleeve 3 to rotate. After the valve sleeve 3 rotates, the interface area between the high-pressure port 29 and the low-pressure port 30 and the sensitive cavity channel 31 changes, and the pressure in the sensitive cavity 32 changes. However, since the pressure in the high-pressure cavity 33 remains constant, the valve core 2 moves axially. The stroke spacing L described in this application can meet the axial movement distance of the valve core 2, preventing interference between the valve core 2 and the rotation limit member 7 and the connecting member 16.

[0047] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to this invention, and can achieve the positive effects described in this invention.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A valve sleeve rotary pilot-controlled axial sliding electro-hydraulic proportional servo valve, comprising a valve body (1), a valve core (2) installed inside the valve body (1), and a valve sleeve (3) disposed outside the valve core (2), characterized in that: The valve body (1) is connected to the side of the external rotor motor (4). The valve sleeve (3) and valve core (2) extend into the inner cavity of the external rotor motor (4). The external rotor motor (4) and the valve sleeve (3) are arranged coaxially, and the external rotor (5) of the external rotor motor (4) is fixedly connected to the valve sleeve (3). The end of the valve core (2) that extends into the inner cavity of the external rotor motor (4) is connected to the housing (6) of the external rotor motor (4) by a rotation limiting member (7). The housing (6) includes a cover (15) and a connecting member (16) integrally formed with the cover (15). The connecting member (16) is partially inserted into the valve sleeve (3). The end of the connecting member (16) inserted into the valve sleeve (3) is connected to the valve core (2) inside the valve sleeve (3). The rotation limiting member (7) is provided between the end and the valve core (2). The end abuts against the concentric ring (17) sleeved on the valve core (2). The end of the connecting member (16) has a first mounting groove (22) that mates with the valve core (2). The rotating limiting member (7) is fixed to the bottom of the first mounting groove (22). The valve core (2) is provided with a second mounting groove (23) that matches the rotating limiting member (7). The valve core (2) is slidably connected to the rotating limiting member (7). There is a stroke distance between the valve core (2) and the bottom of the first mounting groove (22) and between the rotating limiting member (7) and the bottom of the second mounting groove (23) for the valve core (2) to move axially.

2. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 1, characterized in that: The external rotor motor (4) includes a stator assembly (8) and an external rotor (5) coaxially sleeved on the outside of the valve sleeve (3); the external rotor (5) has a rotating sleeve (9), the rotating sleeve (9) includes an annular sidewall (11) and an annular base (12) connected to the valve sleeve (3), multiple ribs (13) are connected between the annular base (12) and the annular sidewall (11), and a positioning pin (14) is provided between the annular base (12) and the valve sleeve (3).

3. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 1, characterized in that: The connecting member (16) is provided with a bearing connecting part (18), and a first thrust bearing (19) is sleeved on the outer periphery of the bearing connecting part (18). The two side walls of the first thrust bearing (19) abut against the inner wall of the cover (15) and the outer rotor (5) respectively.

4. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 3, characterized in that: The connecting member (16) is provided with a sealing connection part (20), and a sealing ring (21) is sleeved on the outer periphery of the sealing connection part (20) of the connecting member (16). The sealing ring (21) is located between the connecting member (16) and the valve sleeve (3).

5. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 1, characterized in that: The valve body (1) is connected to the hydraulic interface plate (24) on the side away from the external rotor motor (4). A sensitive cavity sealing element is provided in the inner cavity of the valve body (1) on the side of the hydraulic interface plate (24), and the sensitive cavity sealing element abuts against the valve sleeve (3).

6. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 5, characterized in that: The sensitive cavity sealing component includes a T-shaped plug (25) and a second thrust bearing (26). The second thrust bearing (26) is sleeved on the protruding end of the T-shaped plug (25) and abuts against the valve sleeve (3).

7. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 1, characterized in that: The rotation limiting member (7) is configured as a right prism-shaped member with a polygonal bottom surface.

8. The axial sliding electro-hydraulic proportional servo valve with a rotating valve sleeve and a control valve core according to claim 1, characterized in that: The valve core (2) has a flow channel (27) inside, and a valve core plug (28) is provided at the end of the flow channel (27) away from the external rotor motor (4).

Images