KR20110077520A - Pressure regulating module - Google Patents

Abstract

PURPOSE: A pressure regulating module is provided to keep discharge pressure regularly by controlling working fluid inside a pressure regulating valve using a servo control type motor. CONSTITUTION: A pressure regulating module comprises: a valve housing(10) having a space inside and inflow, outflow passages to let fluids flow in or out; a servo motor(20) transferring driving force; a spool(30) reciprocating to open and close the inflow, outflow passages selectively; a power transmission unit located between the spool and the servo motor to transfer the driving force of the servo motor to the spool; and a control unit(50) measuring the pressure of fluids discharged from the valve housing and transferring a difference in pressure value, and keeping the discharge pressure to the required value regularly.

Description

Pressure regulating module {PRESSURE REGULATING MODULE}

The present invention relates to a pressure regulating device, and more particularly, to a pressure regulating module which is used in a hydraulic system to regulate the hydraulic pressure and supply it to the outside.

Various hydraulic supply devices are employed in the aircraft, and the role of the valve for properly controlling the hydraulic pressure supplied from the hydraulic storage device and discharging them to the outside is very important. In particular, the wheel brake system of the aircraft requires a high pressure hydraulic pressure, and the hydraulic pressure supplied to the wheel brake according to the braking conditions must be adjusted. When supplying hydraulic pressure to the wheel brake system, the pressure control valve can be used to adjust the operating pressure appropriately.

The pressure regulating valve generally applies a hydraulic control method using a spring to control high pressure hydraulic pressure to a discharge range of a required range, thereby supplying hydraulic pressure to various elements. In particular, the pressure regulating valve used in the hydraulic system of the aircraft is generally used to supply pressure to the brake system. Aircraft hydraulic systems typically use high pressures of 3000 psi and wheelbrake systems require the same or lower pressures. In order to use the braking pressure lower than the pressure of the hydraulic system, a decompression process is required.

Pressure control of the pressure control valve is important to maintain the balance between the spring and the hydraulic pressure, and is made through the fine adjustment of the spool and check valve. On the other hand, the existing pressure control valve is manually operated by the input lever to operate mechanically from the outside when adjusting the hydraulic pressure introduced into the inlet port. This is connected to the input lever using a mechanical cable, the discharge pressure is adjusted by the reciprocating motion of the input rod linked to the input lever.

In this process, since the operator has to operate the lever manually, a problem arises that the operation is not precise. In addition, a deviation of the discharge pressure may occur, and as the deviation increases, a lot of time is consumed to correct it. The problem of inaccurate control of hydraulic pressure in aircraft is inevitable, and studies on devices or modules that control pressure safely and efficiently with accurate and precise driving are required. Therefore, it is necessary to study the pressure regulation module for measuring the change in pressure according to the flow of the fluid to maintain the desired pressure value through the control system.

The present invention has been made in view of the above problems, an object of the present invention is to provide a pressure control module that can maintain a constant discharge pressure by adjusting the operating pressure inside the pressure control valve using a servo-controlled motor.

Another object of the present invention to provide a pressure control module that can reduce the deviation of the pressure size of the fluid actually discharged by the operator using the servo-controlled motor to a minimum.

Another object of the present invention to provide a pressure control module that can adjust the operating force of the spring precisely by using the servo control system, to reduce unnecessary disassembly maintenance time required for pressure correction.

Pressure control module according to an embodiment of the present invention for achieving the above object includes a valve housing, a servo motor, a spool, a power transmission unit, and a control unit.

The valve housing has a space therein, and at least one flow passage of the fluid is formed. The servomotor provides a driving force. The spool can be reciprocated to selectively open and close the oil and the oil passage. The power transmission unit is positioned between the spool and the servo motor to transmit the driving force of the servo motor to the spool. The control unit measures the pressure of the fluid discharged from the valve housing, and then performs a control to transmit a difference from the required pressure value to the servo motor to maintain a constant discharge pressure at the required value.

A check valve is provided on the inflow passage to interrupt the flow of the fluid by contact with the spool. On the other hand, a moving passage is formed inside the spool so that the fluid introduced from the inflow passage can move through the movement passage.

According to an embodiment, the power transmission unit provides a spring for providing an elastic force, a spring guide for transmitting a driving force from the servomotor to the spring in contact with the spring, and the servomotor provides a rotational motion, and provides the rotational motion. It includes a conversion part that converts into linear motion.

In this case, the spring guide includes a lower spring guide connected to the servomotor, and an upper spring guide connected to the spool, and the spring is disposed between the upper spring guide and the lower spring guide. At this time, the spool is equipped with an elastic member for providing an elastic force.

According to an embodiment, a return passage is formed in the valve housing and discharges the fluid remaining in the valve housing.

According to the present invention having the configuration as described above, first, instead of mechanically adjusting the pressure, the operating pressure inside the pressure regulating valve is adjusted through a motor using a servo control system, so that the discharge pressure can be kept constant. have.

Second, by using the servo-controlled motor to accurately calculate the discharge pressure value desired by the operator, the pressure can be adjusted so that the pressure of the actually discharged fluid occurs at least as compared to the operator desired value.

Third, since the deviation between the required value and the actual value with respect to the discharge pressure hardly occurs, it is possible to reduce unnecessary disassembly and maintenance time for correction of the pressure later.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to or limited by the embodiments. In describing the present invention, a detailed description of well-known functions or constructions may be omitted for clarity of the present invention.

1 is a cross-sectional view showing a pressure control module 1 according to the present invention. Pressure control module 1 according to a preferred embodiment of the present invention includes a pressure control valve used for the hydraulic system, a module for controlling the pressure discharged by adjusting the pressure of the fluid introduced into the valve, the wheel of the aircraft It illustrates that it can be employ | adopted when supplying the hydraulic pressure required for brake braking. However, the present invention is not limited thereto, and may be employed in various devices for supplying externally by controlling hydraulic pressure of a self storage or external storage tank. The pressure regulation module 1 includes a valve housing 10, a servo motor 20, a spool 30, a power transmission unit 40, and a control unit 50.

The valve housing 10 has a space therein, and at least one flow path through which the fluid is introduced or discharged is formed. The valve housing 10 is possible in a variety of body shapes of the general valve. The valve housing 10 has an inlet passage 11 which is a passage for moving fluid when the fluid is introduced from the outside and a discharge passage 12 which is a passage for moving the fluid whose pressure is controlled in the valve housing 10 to the outside. ). However, the number or formation position of these flow paths is not limited.

The inlet passage 11 is located at one side of the valve housing 10, and serves as a passage through which fluid enters the valve housing 10 from an external fluid storage tank. The check valve 14 is provided on the inlet passage 11. The check valve 14 regulates the flow of fluid through a selective opening and closing process by contact with the spool 30. Therefore, when the spool 30 pushes the check valve 14 to make a space for the fluid to flow, the fluid is introduced from the outside through the inlet passage 11.

The discharge passage 12 is located at one side of the valve housing 10 to serve as a passage through which the fluid having a regulated pressure inside the valve housing 10 exits to the outside. The discharge passage 12 may be connected to various devices requiring a specific pressure.

According to the embodiment the valve housing 10 further includes a return flow passage 13 through which the fluid inside can escape. The return passage 13 is a passage through which the fluid passes when returning the fluid remaining inside the valve housing 10 to the outside in adjusting the discharge pressure on the discharge passage 12. The detailed operation process is described in detail later.

The servo motor 20 transmits a driving force. More specifically, it is exemplified as providing a rotational motion through rotation of the drive shaft 21 by being located at one side of the valve housing 10, but it is also possible to employ a servomotor providing a translational motion, and use of various servomotors is possible. It is possible. The servo motor 20 is connected to the control unit 50 to transfer the driving force according to the pressure value required by the control unit 50.

The spool 30 has a long bar shape and one side thereof faces the check valve 14 provided on the inlet flow passage 11. One side of the spool 30 may have various shapes or sizes depending on the size of the check valve 14 or the shape of the check valve 14 provided on the inlet flow passage 11. The spool 30 receives the driving force from the servo motor 20 and contacts the check valve 14, thereby intercepting the flow of fluid while the check valve 14 is selectively opened and closed. Inside the spool 30, a moving passage 31 is a passage through which fluid can flow.

The moving passage 31 is formed from one side of the spool 30 to the opposite side while penetrating through the spool 30. The moving passage 31 has a high pressure from the inlet passage 11 to increase the pressure inside the valve housing 10. When the fluid is introduced, not all of the introduced fluid flows out through the discharge passage 11, but part of the fluid flows into the valve housing 10 through the movement passage 31. Therefore, the fluid introduced in this way is discharged through the return passage 13 in the process of lowering the pressure inside the valve housing 10.

The power transmission unit 40 is positioned between the spool 30 and the servo motor 20 to transmit the driving force of the servo motor 20 to the spool 30. The power transmission unit 40 includes a lower spring 41, a lower spring guide 42, an upper spring guide 43, and a conversion part 44.

The lower spring 41 is disposed between the lower spring guide 42 and the upper spring guide 43 while providing an elastic force. In this case, the lower spring guide 42 receives a driving force from the servo motor 20, and receives the driving force converted by the conversion part 44. More specifically, the lower spring guide 42 is exemplified as including a conversion part 44, the drive shaft 21 is a spiral thread is formed spirally, the conversion part 44 is also a spiral thread is formed, When the drive shaft 21 connected to the servomotor 20 is rotated, the lower spring guide 42 is linearly moved by the conversion part 44 connected to the drive shaft 21 in a helical drive manner. That is, the drive shaft 21 and the conversion part 44 forms a spiral screw thread so that the rotational movement is changed into linear movement.

In this case, the conversion part 44 may be formed independently from the lower spring guide 42. In addition, a variant embodiment in which the conversion part 44 is omitted or included in the servo motor 20 so that the servo motor 20 itself provides a translational motion is also possible.

On the other hand, the upper spring guide 43 is connected to the spool 30. Therefore, when the lower spring guide 42, which receives the driving force, applies a load to the lower spring 41, the load is transmitted to the upper spring guide 43 and the spool 30 connected to the upper spring guide 43. It has a structure moving toward the check valve 14.

In this case, the spool 30 is equipped with an upper spring 45 to provide an elastic force. That is, the upper spring 45 is located between the upper spring guide 43 and one side of the valve housing 10. Due to the provision of the upper spring 45, when the spool 30 moves toward the check valve 14 by rotating the servo motor 20 to increase the internal pressure of the valve housing 10, the upper spring guide 43 may maintain a constant space or interval without contacting one side of the valve housing 10. In addition, when the servomotor 20 is rotated to move the lower spring guide 42 downward to lower the pressure in the valve housing 10, the restoring force of the compressed upper spring 45 is increased in the upper spring guide. (43) is pushed away from the check valve (14). The upper spring 45 can be replaced with a variety of members having an elastic force.

The controller 50 performs feedback control to control the control amount to follow the target value. Specifically, after measuring the pressure of the fluid discharged through the discharge passage 12, the control to reduce the difference while calculating the difference with the required pressure value and transfer it to the servo motor 20 again Control to keep the discharge pressure constant at the required value. On the other hand, the control unit 50 is shown to be located outside the valve housing 10, but is not limited to this may be located inside the servo motor 20.

The operation relationship of the pressure regulation module 1 according to the present invention having the configuration as described above will be described with reference to FIGS. 2 and 3.

The discharge pressure on the discharge passage 12 is adjusted according to the operating pressure inside the valve housing 10. That is, when the operating pressure rises inside the valve housing 10, the discharge pressure also increases accordingly. On the contrary, when the operating pressure decreases inside the valve housing 10, the discharge pressure also decreases.

As shown in FIG. 2, in order to increase the operating pressure inside the valve housing 10 to a specific pressure, when a specific pressure value is input to the controller 50, the servomotor 20 rotates accordingly. The lower spring guide 42 moves in the direction of the check valve 14 by the conversion part 44 connected to the drive shaft 21 in a helical driving manner. The movement of the lower spring guide 42 compresses the lower spring 41 to increase the compressive force. In addition, the compressive force of the lower spring 41 is transmitted to the upper spring guide 43 and the spool 30 connected to the upper spring guide 43 moves toward the check valve 14, the check valve 14 To open.

In this case, the load that the spool 30 receives by the upper spring guide 43 may be adjusted by the controller 50. In addition, the rotational speed of the servomotor 20 can be adjusted to adjust the speed at which the spool 30 opens and closes the check valve 14.

On the other hand, when the spool 30 opens the check valve 14 and the high pressure fluid flows through the inlet flow passage 11, the operating pressure inside the valve housing 10 increases. The check valve 14 is opened until the load received by the spool 30 and the hydraulic pressure on the inlet flow passage 11 are equal, and the pressure of the fluid supplied through the inlet flow passage 11 is reduced by the servomotor 20. It is closed when the load is greater than the load applied to the spool 30.

At this time, the lower spring guide 42 is preferably designed so that the fluid introduced into the valve housing 10 does not count into the gap between the lower spring guide 42 and the valve housing 10.

On the other hand, as shown in FIG. 3, when the servomotor 20 is rotated in reverse to reduce the operating pressure inside the valve housing 10, the lower spring 41 receives the lower spring guide 42 from the lower spring guide 42. The load is reduced, and thus the compressive force is reduced, so that the load received by the upper spring guide 43 from the lower spring 41 is reduced. As a result, the spool 30 is moved away from the check valve 14 so that the check valve 14 is closed and the operating pressure inside the valve housing 10 is reduced. At this time, the pressure remaining in the valve housing 10 is released through the return passage (13).

As a result, when the discharge pressure on the discharge passage 12 is determined through the control unit 50, and the information is provided to the servo motor 20, the rotation of the servo motor 20 and the conversion part 44 which converts the linear motor into linear motion are provided. The position of the lower spring guide 42 is determined, and accordingly, the spool 30 opens or closes the check valve 14, thereby determining the pressure of the fluid flowing through the inlet flow path 11, that is, the hydraulic pressure. By the balance of the compression force of the spring and the hydraulic pressure inside the valve housing 10 through the moving passage 31 formed on the spool 30, the discharge pressure through the discharge passage 12 is kept constant.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided only to help a more general understanding of the present invention, and the present invention is limited to the above-described embodiments. In other words, various modifications and variations are possible to those skilled in the art to which the present invention pertains. Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and all the things that are equivalent to or equivalent to the scope of the claims as well as the claims to be described later belong to the scope of the present invention.

1 is a cross-sectional view schematically showing a pressure control module according to an embodiment of the present invention, and

2 and 3 are cross-sectional views schematically showing the operating relationship of the pressure regulation module of FIG.

Description of the Related Art [0002]

1: pressure control module 10: valve housing

11: inlet passage 12: discharge passage

20: servo motor 30: spool

40: power transmission portion 41: lower spring

42: lower spring guide 43: upper spring guide

44: conversion part 45: upper spring

50: control unit

Claims (7)

A valve housing having a space therein and having at least one fluid flow path and an flow path formed therein; A servo motor providing a driving force; A spool capable of reciprocating to selectively open and close the oil and the oil passage; A power transmission unit positioned between the spool and the servo motor to transfer a driving force of the servo motor to the spool; And A control unit for measuring the pressure of the fluid discharged from the valve housing and performing a control to transmit a difference from the required pressure value to the servo motor to maintain the discharge pressure at the required value; Pressure control module comprising a. The method of claim 1, A check valve is provided on the inflow passage, and regulates the flow of the fluid by the contact with the spool. The method of claim 1, The flow passage is formed in the spool, pressure control module, characterized in that the fluid flowing from the inflow passage can move through the movement passage. The method according to any one of claims 1 to 3, The power transmission unit, A spring providing an elastic force; A spring guide in contact with the spring to transfer a driving force from the servomotor to the spring; And The servo motor provides a rotational motion, the conversion part for converting the rotational motion into a linear motion; Pressure control module comprising a. 5. The method of claim 4, The spring guide, A lower spring guide connected to the servomotor; And An upper spring guide connected to the spool; It includes, wherein the spring is a pressure regulation module, characterized in that placed between the upper and lower spring guide. The method of claim 5, Pressure regulator module characterized in that the spool is equipped with an elastic member for providing an elastic force. The method according to any one of claims 1 to 3, The pressure regulating module is formed in the valve housing, characterized in that the return passage for discharging the fluid remaining in the valve housing is formed.

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