Rotary direct-drive type pressure control valve

Abstract

The utility model discloses a rotary direct-drive type pressure control valve. The rotary direct-drive type pressure control valve comprises a limited angle torque motor, a pressure sensor, a valve body, a valve sleeve, a valve element, a reset spring, a plug, a baffle and the like. The rotation angle torque limiting motor is a driving device, the rotation motion of the motor is converted into the linear motion of the valve element through an eccentric structure at the shaft end, the moving direction of the motor is perpendicular to that of the valve element, and the structure arrangement is more compact compared with a direct-drive valve. According to the valve element and the valve sleeve, by designing the area gradient of a throttling window, the pressure gain when the valve element is opened is reduced, and the influence of pressure pulses on the performance is greatly reduced. According to the pressure control valve, the problems that a traditional pressure control valve is large in leakage amount, poor in anti-pollution capacity and low in reliability can be solved, electric feedback servo control is added, and therefore the pressure control valve is simpler in structure, more flexible in control mode, smaller in leakage amount, higher in anti-pollution capacity and higher in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of airplane hydraulic brake system, specifically a kind of electric hydraulic pressure control valve for airplane hydraulic brake system can control output pressure. BACKGROUND

[0002] Pressure control valve is important control element in airplane brake system, by given control instruction, output corresponding control pressure, push brake piston to machine wheel and brake, shorten brake distance.Currently used electric hydraulic pressure control valve is mainly two-stage double-nozzle baffle pressure control valve, it changes two-nozzle cavity pressure by adjusting baffle distance and acts on the both ends of spool valve, realizes the movement control of spool valve.This kind of valve performance is excellent, but structure is complex, manufacturing is difficult, use condition is extremely harsh, very sensitive to oil pollution, high failure rate, large leakage flow, low reliability. CONTENT OF UTILITY MODEL

[0003] The utility model provides a kind of structure scheme of rotary direct drive type pressure control valve, cancel the complex pre-stage of traditional two-stage pressure control valve, while simplifying structure, reduce the leakage of valve, improve its reliability.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A kind of rotary direct drive type pressure control valve, characterized in that: the control valve includes shell, valve sleeve, valve core, limited angle torque motor, eccentric mechanism, pressure sensor;Limited angle torque motor is converted into the transverse movement of valve core by the eccentric mechanism with the rotation of limited angle torque motor;

[0006] The limited angle torque motor is fixed on the upper end surface of valve body, and the motor shaft of limited angle torque motor is connected with valve core by eccentric mechanism;

[0007] The pressure sensor is fixed on the upper end surface of valve body, and load pressure is introduced into the bottom of pressure sensor by the output cavity flow channel of valve body.

[0008] Further, the control valve adopts the structural design of valve core valve sleeve, including valve sleeve plug, valve body baffle, valve sleeve baffle and plug;The valve core is located in the valve sleeve, the valve sleeve is installed in the shell, the left end of the valve sleeve is fixed by shell, and the right end is fixed by valve sleeve plug and valve sleeve baffle;One end of the valve core is connected with eccentric mechanism, and the other end is in contact with reset spring;The reset spring is embedded in the valve sleeve plug.

[0009] Further, the valve sleeve is sealed with shell by multiple sealing rings.

[0010] Further, the reset spring pushes the valve core to the limit position away from the reset spring side without control signal instruction, closes the oil inlet chamber, opens the oil return chamber, and unloads the load chamber.

[0011] Further, the side wall of the valve sleeve is provided with a throttling window, and the throttling window adopts a multi-window form with circular arc transition.

[0012] Further, the valve body lower end face is provided with an oil inlet, an oil outlet, an oil return flow channel and an oil return port, the valve core is provided with an oil inlet chamber, an oil return chamber and a load chamber, the oil inlet, the oil outlet and the oil return port are communicated with the oil inlet chamber, the load chamber and the oil return chamber respectively, and the oil return flow channel is communicated with the oil return chamber, so that the motor shaft works in a low-pressure environment.

[0013] Compared with the prior art, the low-leakage high-reliability rotary direct drive pressure control valve has the following beneficial effects:

[0014] 1. The pre-stage of the traditional two-stage pressure control valve is cancelled, and a rotary direct drive structure is adopted, so that the structure is simpler, the spatial layout is more compact, the leakage of the pressure control valve is greatly reduced, the problem of performance degradation or failure caused by oil pollution is avoided, and the reliability of the pressure control valve is improved.

[0015] 2. The valve core and the valve sleeve adopt a multi-window structure form with circular arc transition, the area gradient of the throttling window when the valve sleeve window is opened is reduced, the output pressure gain when the valve port is opened is reduced, the influence of pressure pulse on output performance can be effectively reduced, and the response speed and stability of the pressure control valve are improved.

[0016] 3. The reset spring is arranged on the right side of the valve core, and when there is no control signal instruction, the reset spring pushes the valve core to the limit position to the left, unloads the load chamber, realizes the safety protection function, and improves the safety reliability of the pressure control valve. DETAILED DESCRIPTION

[0017] Figure 1 is a structure schematic view of the rotary direct drive pressure control valve provided by the embodiment of the utility model;

[0018] Figure 2 is Figure 1 the valve body bottom surface schematic view;

[0019] Figure 3 when Figure 1 the valve sleeve top surface schematic view;

[0020] Figure 4 is a three-dimensional structure schematic view of the rotary direct drive pressure control valve provided by the embodiment of the utility model;

[0021] Wherein: 1-valve body; 2-oil return flow channel; 3-valve sleeve; 4-oil return cavity; 5-oil port sealing ring; 6-valve core; 7-output cavity flow channel 7; 8-bottom guard plate; 9-oil inlet cavity; 10-reset spring; 11-valve sleeve plug; 12-valve sleeve baffle; 13-valve sleeve sealing ring; 14-load cavity; 15-pressure sensor; 16-limited angle torque motor; 17-motor shaft; 18-eccentric mechanism; 19-valve core through hole; 20-baffle; 21-plug; 22-plug sealing ring; 23-pressing plate; 24-oil inlet; 25-oil outlet; 26-oil return port; 27-oil return throttle window; 28-oil outlet window; 29-oil inlet throttle window. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] The utility model embodiment provides a kind of rotary direct drive pressure control valve as Figure 1 As shown in the figure, it includes: limited angle torque motor assembly, power amplification stage slide valve assembly, pressure sensor assembly.

[0024] The limited angle torque motor 16 is fixed on the upper end surface of valve body 1 by pressing plate 23, and motor shaft 17 is connected with valve core 6 through eccentric mechanism 18, converting the rotary motion of motor into the linear motion of valve core 6. The power amplification stage slide valve assembly is composed of valve body 1, valve sleeve 3 and valve core 6. Valve body 1 has oil inlet 24, oil outlet 25 and oil return port 26 on the lower end surface, which are communicated with oil inlet cavity 9, load cavity 14 and oil return cavity 4 respectively. Oil return flow channel 2 is the same as oil return cavity 4, so that motor shaft works in low pressure environment. Valve sleeve 3 is isolated from the pressure of oil inlet cavity 9, load cavity 14 and oil return cavity 4 by sealing ring 13, and is tightly fixed in valve body 1 by valve sleeve plug 11 and valve sleeve baffle 12. Valve core 6 is installed in the hole of valve sleeve 3, the left end is connected with eccentric mechanism 18, the right end is in contact with reset spring 10, and is mechanically limited by the left end surface of valve sleeve plug 11. Valve core through hole 19 is used to balance the pressure of the two ends of valve core 6. Pressure sensor 15 is fixed on the upper end surface of valve body 1 by threaded plug-in, and the load pressure is introduced into the bottom of pressure sensor 15 through output cavity flow channel 7 of valve body 1.

[0025] The limited angle torque motor assembly is mainly composed of a limited angle torque motor 16 and an eccentric mechanism 18. The limited angle torque motor 16 is consistent with the principle of a conventional torque motor and is not specially introduced. The limited angle torque motor 16 is fixed on the upper end surface of the valve body 1 through a pressing plate 23. The eccentric mechanism 18 is fixed on the end surface of the motor shaft 17 with a certain eccentricity and cooperates with the valve core 6 to convert the rotary motion of the motor 16 into the linear motion of the valve core 6.

[0026] The power amplification stage spool valve assembly is composed of a valve body 1, a valve sleeve 3, a valve core 6, a reset spring 10, a valve sleeve plug 11, a plug 21, a valve sleeve baffle 12 and a baffle 20. The valve body 1 has a rectangular overall structure. An installation groove of the limited angle torque motor 6 and an installation threaded hole of a pressure sensor 16 are formed on the upper end surface of the valve body 1. An oil inlet 24, an oil outlet 25 and an oil return 26 are formed on the lower end surface of the valve body 1 and are sealed by a sealing ring 5. The valve sleeve 6 is isolated from the pressures of an oil inlet cavity 9, a load cavity 14 and an oil return cavity 4 through a sealing ring 13 and is tightly fixed in the valve body 1 through the valve sleeve plug 11 and the valve sleeve baffle 12. The valve core 6 is installed in the inner hole of the valve sleeve 3, one end of the valve core 6 is connected with the eccentric mechanism 18 and the other end of the valve core 6 is in contact with the reset spring 10. The valve core 6 is mechanically limited by the valve sleeve plug 11 and the valve sleeve baffle 12.

[0027] The oil inlet 24, the oil outlet 25 and the oil return 26 of the valve body 1 are communicated with the oil inlet cavity 9, the load cavity 14 and the oil return cavity 4 respectively through internal flow channels. The oil return flow channel 2 of the motor shaft cavity is communicated with the oil return cavity 4, so that the motor shaft 17 works in a low-pressure environment and the performance of the motor is prevented from being affected by high-pressure oil. The load cavity 14 leads out an output cavity flow channel 7 which is communicated with the through hole of the upper end surface pressure sensor 16. The left end surface is sealed by the plug 11 and the right end surface is the installation surface of the valve sleeve 3. Since the valve sleeve 3 and the valve body 1 are sealed by multiple sealing rings 13, the installation chamfer of the sealing ring is increased in the installation direction of the valve sleeve 3 and the oil inlet cavity 9, the load cavity 14 and the oil return cavity 4 in the valve body 1, so as to prevent the sealing ring from being damaged during installation.

[0028] The valve sleeve 3 has a structure as shown in Figure 3 The oil return throttling window 27 and the oil inlet throttling window 29 are both multi-window forms with circular arc transitions, which can reduce the throttling window area gradient when the valve sleeve window is opened, reduce the output pressure gain when the valve port is opened and effectively reduce the influence of pressure pulse on performance. In order to ensure the oil outlet flow, four evenly distributed circular oil outlet windows 28 are formed in the valve sleeve 3. Sealing grooves are arranged between the windows to isolate high and low oil pressure.

[0029] The shoulder of the valve core 6 is provided with an equalizing groove, avoiding the hydraulic clamping phenomenon of the valve core and sleeve, and an axial through hole 19 is arranged on the valve core, which is used for communicating the cavities at both ends of the valve core 19, so that the cavities at both ends are the same as the low pressure cavity, preventing the generation of axial hydraulic pressure. In order to ensure that the motor 16 is not affected by high pressure oil, the left end of the valve core 6 is extended to be connected with the motor shaft 17 in the low pressure cavity.

[0030] The reset spring 10 is installed between the valve core 6 and the valve sleeve plug 11, and when there is no control signal instruction, the reset spring 10 pushes the valve core 6 to the left limit position, closes the oil inlet cavity 9, opens the oil return cavity 4, unloads the load cavity 14, realizes the safety protection function, and improves the safety and reliability of the pressure control valve.

[0031] The utility model provides a kind of low-leakage high-reliability rotary direct drive type pressure control valve principle structure, by adding electric feedback servo control, make its structure more simple, control mode is more flexible, with smaller leakage, stronger anti-pollution ability and higher reliability.

Claims

1. A rotary direct drive pressure control valve characterized by: The control valve comprises a shell, a valve sleeve, a valve core, a limited rotation torque motor, an eccentric mechanism and a pressure sensor; the rotation of the limited rotation torque motor is converted into the lateral movement of the valve core through the eccentric mechanism; The limited rotation torque motor is fixed on the upper end face of the valve body, and the motor shaft of the limited rotation torque motor is connected with the valve core through the eccentric mechanism; The pressure sensor is fixed on the upper end face of the valve body, and the load pressure is introduced into the bottom of the pressure sensor through the output cavity flow channel of the valve body; The control valve adopts the structural design of the valve core and the valve sleeve, and comprises a valve sleeve plug, a valve body baffle, a valve sleeve baffle and a plug; the valve core is located in the valve sleeve, the valve sleeve is installed in the shell, the left end of the valve sleeve is fixed through the shell, and the right end is tightly fixed through the valve sleeve plug and the valve sleeve baffle; one end of the valve core is connected with the eccentric mechanism, and the other end is in contact with the reset spring; the reset spring is embedded in the valve sleeve plug; When there is no control signal instruction, the reset spring pushes the valve core to the limit position away from the reset spring, closes the oil inlet cavity, opens the oil return cavity, and unloads the load cavity.

2. The rotary direct drive pressure control valve of claim 1, wherein: The valve sleeve is sealed with the shell through multiple sealing rings.

3. The rotary direct drive pressure control valve of claim 1, wherein: The side wall of the valve sleeve is provided with a throttling window, and the throttling window adopts a multi-window form with a circular arc transition.

4. The rotary direct drive pressure control valve of claim 1, wherein: The lower end face of the valve body is provided with an oil inlet, an oil outlet, an oil return flow channel and an oil return port, the valve core is provided with an oil inlet cavity, an oil return cavity and a load cavity, the oil inlet, the oil outlet and the oil return port are communicated with the oil inlet cavity, the load cavity and the oil return cavity respectively, and the oil return flow channel is communicated with the oil return cavity, so that the motor shaft works in a low-pressure environment.

Images