CN116538318A - Sliding change-over valve and application - Google Patents

Sliding change-over valve and application Download PDF

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Publication number
CN116538318A
CN116538318A CN202310453011.4A CN202310453011A CN116538318A CN 116538318 A CN116538318 A CN 116538318A CN 202310453011 A CN202310453011 A CN 202310453011A CN 116538318 A CN116538318 A CN 116538318A
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CN
China
Prior art keywords
oil
oil inlet
cavity
valve
shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310453011.4A
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Chinese (zh)
Inventor
齐云波
赵伟涛
胥建波
孟晋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Hai Hai Aviation Technology Co ltd
Original Assignee
Xi'an Hai Hai Aviation Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xi'an Hai Hai Aviation Technology Co ltd filed Critical Xi'an Hai Hai Aviation Technology Co ltd
Priority to CN202310453011.4A priority Critical patent/CN116538318A/en
Publication of CN116538318A publication Critical patent/CN116538318A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02—Application and release valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/022—Flow-dividers; Priority valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor

Abstract

The invention relates to a sliding change-over valve and application thereof, belonging to the field of hydraulic brake control of aircraft; the self-adaptive valve comprises a shell, wherein an inner cavity of the shell is provided with a self-adaptive valve core and an elastic part in sequence along the axial direction; the self-adaptive valve core comprises a valve rod, and two self-adaptive molded surfaces are axially arranged on the peripheral surface of the valve rod; the section of the valve rod is smaller than the section of the inner cavity of the shell, and the valve rod can axially slide in the inner cavity of the shell; the two self-adaptive molded surfaces divide the inner cavity of the shell into a control cavity, a switching cavity and a reset cavity in turn along the axial direction, and the elastic component is positioned in the reset cavity; the elastic component and the oil pressure in the control cavity generate reverse acting force along the axial direction to the valve rod, and the position of the valve rod in the inner cavity is controlled; when the oil way is switched, the oil inlet is plugged and closed before switching through the two self-adaptive molded surfaces. The switching valve disclosed by the invention has the advantages that the working performance and the use reliability of the existing aircraft brake switching valve are obviously improved by utilizing the structural characteristics of the self-adaptive valve core, and the switching of the pressure supply oil way when emergency braking is required is ensured.

Description

Sliding change-over valve and application
Technical Field
The invention belongs to the field of hydraulic brake control of aircraft, and particularly relates to a sliding switching valve and application thereof.
Background
The switching valve is a fluid control accessory commonly used in the technical fields of industrial and agricultural production, aviation, aerospace and the like, and the switching valve is used for switching the pressure supply to select the pressure supply source through the oil circuit, so that the actuating mechanism can still continue to operate after the normal pressure supply source is lost. The switching valve can also be used for sharing a pipeline at the downstream of the system, so that the weight and the cost of the system are saved. The aircraft braking system relates to a plurality of hydraulic accessories, the switching valve is an aircraft emergency braking system accessory, after the normal braking system of the aircraft fails, a pilot selects the emergency braking system, and the aircraft braking under emergency conditions is realized by operating the emergency braking. The switching valve is seemingly simple and easy to ignore, and the performance and reliability of the switching valve are important to the emergency braking relation of the airplane. In the prior art, a ball valve and a cone valve are used as a conversion valve, so that the defects of working vibration, unstable conversion, valve damage, rust death and the like exist, and particularly, if the valve cannot be converted at key moments, serious accidents are extremely easy to cause.
Disclosure of Invention
The technical problems to be solved are as follows:
in order to avoid the defects of the prior art, the invention provides the sliding switching valve and the application thereof, and the switching valve remarkably improves the working performance and the use reliability of the existing aircraft brake switching valve by utilizing the structural characteristics of the self-adaptive valve core, and ensures that the pressure supply oil way is switched when emergency braking is required.
The technical scheme of the invention is as follows: a sliding change-over valve comprises a shell 1, wherein an inner cavity of the shell is provided with a self-adaptive valve core and an elastic part in sequence along the axial direction;
the self-adaptive valve core comprises a valve rod, and two self-adaptive molded surfaces are axially arranged on the peripheral surface of the valve rod; the section of the valve rod is smaller than the section of the inner cavity of the shell, and the valve rod can axially slide in the inner cavity of the shell; the two self-adaptive molded surfaces divide the inner cavity of the shell into a control cavity 15, a switching cavity 16 and a reset cavity 17 in turn along the axial direction, and the elastic component is positioned in the reset cavity 17;
the elastic component and the oil pressure in the control cavity 15 generate reverse acting force along the axial direction to the valve rod, and the position of the valve rod in the inner cavity is controlled; when the oil way is switched, the oil inlet is plugged and closed before switching through the self-adaptive molded surface.
The invention further adopts the technical scheme that: the shell 1 is provided with a first oil inlet 10 connected with a normal oil supply system pipeline, a second oil inlet 11 connected with an emergency oil supply system pipeline, an oil outlet 12 connected with an execution device pipeline, and three oil ports which are distributed and communicated with the inner cavity of the shell through an oil way arranged in the shell, wherein the communication ports are a first oil inlet window A, a second oil inlet window B and a third oil outlet window C respectively;
in a free state of the elastic component, the self-adaptive valve core is abutted against one side wall surface of the inner cavity of the shell under the action of elastic force, meanwhile, the second oil inlet window B is blocked and closed by one self-adaptive molded surface of the valve rod, and oil flows out from the oil outlet 12 through the first oil inlet 10, the first oil inlet window A, the switching cavity 16 and the third oil outlet window C; under the pressure state of the elastic component, the self-adaptive valve core is propped against the other side wall surface of the inner cavity of the shell under the action of oil pressure in the control cavity 15, meanwhile, the first oil inlet window A is blocked and closed by the other self-adaptive molded surface of the valve rod, and oil flows out from the oil outlet 12 through the second oil inlet 11, the second oil inlet window B, the switching cavity 16 and the third oil outlet window C.
The invention further adopts the technical scheme that: the shell 1 is of a block structure, one end of the shell is provided with a blind hole, and the orifice is blocked by a plug 4 to form an inner cavity; in the inner cavity, the self-adaptive valve core is positioned at one side of the hole bottom, and the elastic part is positioned at one side of the plug 4;
the periphery of the inner cavity is sequentially provided with a first oil inlet 10, an oil outlet 12 and a second oil inlet 11 along the axial direction, the first oil inlet 10 is communicated with a first oil inlet window A and a reset cavity 17 through an oil way arranged in the shell, the second oil inlet 11 is communicated with a second oil inlet window B and a control cavity 15 through an oil way arranged in the shell, the oil outlet 12 is communicated with a switching cavity 16 through an oil way third oil outlet window C arranged in the shell, and the switching cavity 16 is controlled to be communicated with the first oil inlet 10 or the second oil inlet 11.
The invention further adopts the technical scheme that: the first oil inlet window A, the second oil inlet window B and the third oil outlet window C are three annular grooves arranged on the peripheral surface of the blind hole, and an inlet or an outlet communicated with the oil way is formed in the lower portion of each groove.
The invention further adopts the technical scheme that: the two self-adaptive molded surfaces of the valve core 2 are two shaft shoulders arranged on the valve rod, the axial width of the shaft shoulders is larger than the width of the notch of the annular groove, and the notch can be completely blocked; the first shaft shoulder is close to one side of the hole bottom, and the second shaft shoulder is close to one side of the plug 4; in the free state of the elastic part, the annular groove of the second oil inlet window B is blocked by the outer peripheral surface of the second shoulder; and in the pressed state of the elastic part, the annular groove of the first oil inlet window A is blocked by the outer peripheral surface of the first shaft shoulder.
The invention further adopts the technical scheme that: the elastic component is a spring 3, one end of the spring is sleeved on the valve rod and abuts against the outer end face of the second shoulder, and the other end of the spring abuts against the inner side face of the plug 4.
The invention further adopts the technical scheme that: the plug 4 is a T-shaped rotary body plug screw and comprises a threaded head and a neck, wherein the threaded head is screwed into a blind hole opening of the shell 1 through threads; the neck rod is inserted into the blind hole and is in clearance fit with the blind hole;
the plug 4 is provided with a vent hole 21 along the central axis for communicating the reset cavity 17 with the external atmospheric pressure to prevent the reset cavity 17 from holding breath.
The invention further adopts the technical scheme that: the plug 4 is a filler neck, a communication hole is formed along the central shaft, and the filler neck is communicated with an oil return pipeline or an air-oil conduit of an aircraft system, and an external pipeline is needed.
The invention further adopts the technical scheme that: the contact surface between the plug 4 and the blind hole is provided with a sealing ring groove along the circumferential direction, and a sealing ring 18 and a check ring 19 are arranged in the sealing ring groove to prevent oil from leaking.
The application of the sliding switching valve is that the sliding switching valve is applied to the switching of a pressure supply oil way when an aircraft brakes;
in an initial state, namely under the condition of no brake, the first oil inlet 10 and the second oil inlet 11 are not supplied with pressure, the control cavity 15 is not acted by hydraulic pressure, the valve core 2 is positioned at one side limit position of the inner cavity under the action of the elasticity of the spring 3, the valve rod abuts against the bottom of the hole of the blind hole 5, the first shoulder of the valve core 2 is positioned at the left side of the first oil inlet 10, the first annular groove 7 is exposed, namely the first oil inlet window A is opened, the second shoulder of the valve core 2 shields the second annular groove 8, namely the second oil inlet window B is closed, and the switching cavity 16 is communicated with the first oil inlet 10;
when the brake is in a normal state, the first oil inlet 10 supplies oil, the oil is communicated with the oil outlet 12 through the switching cavity 16, and hydraulic oil is conveyed to a wheel brake device through the oil outlet 12 for braking;
when the brake is in a system failure state, the pilot starts an emergency brake system; when emergency braking is carried out, the first oil inlet 10 is not supplied with pressure, the second oil inlet 11 supplies pressure, hydraulic oil of the second oil inlet 11 enters the control cavity 15, the control cavity 15 obtains control hydraulic pressure, the valve core 2 is pushed to move rightwards under the action of the control hydraulic pressure until the valve rod at the right end is abutted against the inner end face of the plug 4, at the right limit position, the second shoulder of the valve core 2 exposes the second annular groove 8, namely the second oil inlet window B is opened, meanwhile, the first shoulder of the valve core 2 shields the first annular groove 7, namely the first oil inlet window A is closed, the switching cavity 16 is communicated with the second oil inlet 11, the second oil inlet 11 is communicated with the oil outlet 12 through the switching cavity 16, and the hydraulic oil is conveyed to the wheel braking device through the oil outlet 12 to carry out braking, so that the switching of an oil supply way from normal to emergency is realized;
when the emergency braking is finished, the second oil inlet 11 is not supplied with pressure, the control cavity 15 controls the hydraulic pressure to disappear, the valve core 2 returns to the initial state under the action of the elastic force of the spring 3, namely the second shoulder of the valve core 2 closes the second oil inlet window B, and the first shoulder of the valve core 2 opens the first oil inlet window A; the first oil inlet 10 is communicated with the oil outlet 12 through the switching cavity 16, and outputs the braking pressure of the normal braking system through the switching valve.
Advantageous effects
The invention has the beneficial effects that: the sliding switching valve comprises a shell, the self-adaptive valve core and an elastic part, the working performance and the use reliability of the existing aircraft brake switching valve are obviously improved by utilizing the structural characteristics of the self-adaptive valve core, and the pressure supply oil way is ensured to be switched when emergency braking is required.
The casing is equipped with 3 hydraulic interface: the outer end of the first oil inlet is connected with a normal brake system pipeline, the outer end of the second oil inlet is connected with an emergency system pipeline, and the outer end of the oil outlet is connected with a wheel brake device pipeline; the valve core is slidably arranged in the cavity of the shell, is a cylindrical valve core with two convex shoulders, is matched with the inner hole of the shell in a grinding way, and is sealed by virtue of a gap, and the convex shoulders of the valve core move to shield the corresponding oil through window, so that one of the first oil inlet and the second oil inlet for supplying oil and pressing the source is selected to output from the oil outlet. The slide valve structure is adopted, so that the defects of working vibration, unstable conversion, valve damage, rust death and the like in the prior art caused by adopting ball valves and cone valves as conversion valves are overcome. The reset cavity has different communication modes for selection. The reset cavity is communicated with the outside atmosphere, so that the structure is simplified; the reset cavity is communicated with the first oil inlet, so that external connection is saved, weight is reduced, the valve core can be ensured to be in an initial position under the pressure action of a normal brake system, the first oil inlet and the oil outlet are kept in smooth connection, and preparation is made for normal braking.
According to the invention, the first oil inlet window A, the second oil inlet window B and the third oil outlet window C are arranged into three annular groove structures, the inlet and the outlet of the groove are communicated with the oil inlet and the oil outlet through oil ways arranged in the shell, and the annular groove structures optimize the arrangement of oil way channels in the shell and facilitate processing.
The reset cavity 17 is communicated with the first oil inlet 10, so that external connection is saved, weight is reduced, the valve core 2 is ensured to be in the initial position under the pressure action of a normal brake system, and the first oil inlet 10 is ensured to be smoothly connected with the oil outlet 12. The reset cavity 17 is communicated with the first oil inlet 10, the outer end surface of the second shoulder 14 acts on hydraulic pressure, so that the valve core 2 moves to and is kept at the left limit position, the normal brake system is ensured to supply pressure, the oil pressure of the normal brake system is output from the oil outlet 12 through the switching cavity 16, and the sliding switching valve is equivalent to a section of pipeline.
The invention has reasonable design and excellent performance, obviously improves the working performance and the use reliability of the airplane brake switching valve, ensures the safe and reliable operation of the airplane brake system, prevents the flying accidents caused by the switching valve problem, and has obvious technical, economic, military and social benefits.
Drawings
FIG. 1 is a schematic illustration of a sliding switch valve according to the present invention;
FIG. 2 is a schematic diagram of a sliding switch valve according to the present invention;
FIG. 3 is a schematic view of a structure in which a reset cavity of a sliding switch valve of the invention is communicated with the outside and is communicated with the atmosphere;
fig. 4 is a schematic diagram of a return oil structure of a sliding switch valve according to the present invention.
Reference numerals illustrate: 1. a housing; 2. a valve core; 3. a spring; 4. blocking; 5. a blind hole; 6. a stepped threaded hole; 7. a first annular groove; 8. a second annular groove; 9. a third annular groove; 10. a first oil inlet; 11. a second oil inlet; 12. an oil outlet; 13. a first shoulder; 14. a second shoulder, 15, a control chamber; 16. a switching cavity; 17. a reset chamber; 18. a seal ring; 19. a retainer ring; 20. the vent hole is blocked; 21. a vent hole; 22. a filler neck; 23. a communication hole; A. a first oil inlet window; B. a second oil inlet window; C. and a third oil outlet window.
Detailed Description
The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Hereinafter, the "left" and "right" directions are referred to as the positions shown in the drawings, and the longitudinal direction means the longitudinal direction, and the horizontal direction in the drawings.
According to the sliding switching valve, the valve core is controlled to axially slide along the inner cavity of the shell through acting forces of the elastic component and oil pressure, and the problems that in the prior art, the working performance of the aircraft brake switching valve is unstable and the use is unreliable are solved.
The sliding switching valve comprises a shell 1, wherein an inner cavity of the shell is provided with a self-adaptive valve core and an elastic part in sequence along the axial direction; the self-adaptive valve core comprises a valve rod, and two self-adaptive molded surfaces are axially arranged on the peripheral surface of the valve rod; the section of the valve rod is smaller than the section of the inner cavity of the shell, and the valve rod can axially slide in the inner cavity of the shell; the two self-adaptive molded surfaces divide the inner cavity of the shell into a control cavity 15, a switching cavity 16 and a reset cavity 17 in turn along the axial direction, and the elastic component is positioned in the reset cavity 17; the elastic component and the oil pressure in the control cavity 15 generate reverse acting force along the axial direction to the valve rod, and the position of the valve rod in the inner cavity is controlled; when the oil way is switched, the oil inlet is plugged and closed before switching through the two self-adaptive molded surfaces.
The shell 1 is provided with a first oil inlet 10 connected with a normal oil supply system pipeline, a second oil inlet 11 connected with an emergency oil supply system pipeline, an oil outlet 12 connected with an execution device pipeline, and three oil ports which are distributed and communicated with the inner cavity of the shell through an oil way arranged in the shell, wherein the communication ports are a first oil inlet window A, a second oil inlet window B and a third oil outlet window C respectively; in a free state of the elastic component, the self-adaptive valve core is abutted against one side wall surface of the inner cavity of the shell under the action of elastic force, meanwhile, the second oil inlet window B is blocked and closed by one self-adaptive molded surface of the valve rod, and oil flows out from the oil outlet 12 through the first oil inlet 10, the first oil inlet window A, the switching cavity 16 and the third oil outlet window C; under the pressure state of the elastic component, the self-adaptive valve core is propped against the other side wall surface of the inner cavity of the shell under the action of oil pressure in the control cavity 15, meanwhile, the first oil inlet window A is blocked and closed by the other self-adaptive molded surface of the valve rod, and oil flows out from the oil outlet 12 through the second oil inlet 11, the second oil inlet window B, the switching cavity 16 and the third oil outlet window C.
The invention has reasonable design and excellent performance, obviously improves the working performance and the use reliability of the airplane brake switching valve, ensures the safe and reliable operation of the airplane brake system, prevents the flying accidents caused by the switching valve problem, and has obvious technical, economic, military and social benefits.
The following describes the technical scheme in detail with reference to the accompanying drawings.
Examples:
referring to fig. 1-2, the embodiment is a sliding switching valve for an aircraft hydraulic brake system, which comprises a shell 1, a valve core 2, a spring 3 and a plug 4;
the shell 1 is provided with a longitudinal blind hole 5 for installing the valve core 2; the hole opening of the blind hole 5 is a stepped threaded hole 6 for installing the plug 4; the blind hole 5 is provided with 3 annular grooves longitudinally spaced: a first annular groove 7, a second annular groove 8 and a third annular groove 9, wherein the first annular groove 7 is close to the bottom of the hole of the blind hole 5, and the third annular groove 9 is positioned between the first annular groove 7 and the second annular groove 8; the cross section of the annular groove is a U-shaped groove, and the geometric center line of the annular groove is coaxial with the geometric center line of the blind hole 5; the annular grooves are used as slide valve oil through windows, the first annular groove 7 is a first oil inlet window A, the second annular groove 8 is a second oil inlet window B, and the third annular groove 9 is an oil outlet window C;
the housing 1 is provided with 3 hydraulic interfaces: the first oil inlet 10, the second oil inlet 11 and the oil outlet 12 are used for connecting an external system with an internal oil path of the shell 1; specifically, the outer end of the first oil inlet 11 is connected with a normal brake system pipeline, the outer end of the second oil inlet 11 is connected with an emergency system pipeline, and the outer end of the oil outlet 12 is connected with a wheel brake device pipeline; the inner ends of the first oil inlet 10, the second oil inlet 11 and the oil outlet 12 are respectively communicated with the inner cavity of the blind hole 5 through oil ways in the shell; specifically, the first oil inlet 10 is communicated with the first oil inlet window A through an oil way in the shell; the second oil inlet 11 is communicated with the second oil inlet window B through an oil way in the shell; the oil outlet 12 is communicated with the third oil outlet window C through an oil way in the shell;
the shell 1 is made of aluminum alloy; the inner surface of the blind hole 5 of the shell 1 is subjected to hard anodizing treatment;
the valve core 2 is arranged in the blind hole 5 of the shell 1, can axially move in the blind hole 5 under the action of hydraulic force and spring force, and controls the switching of an oil circuit; the valve core 2 is a cylindrical sliding valve core and comprises a valve rod and 2 convex shoulders: a first shoulder 13 and a second shoulder 14, wherein the first shoulder 13 is close to the bottom of the hole of the blind hole 5, and the second shoulder 14 is close to the hole mouth of the blind hole 5; the shoulder is coaxial with the valve rod; the width of the convex shoulder is larger than the width of the U-shaped groove, namely the width of the convex shoulder is larger than the width of the oil passing window; the distance between the two shoulders is such that when one shoulder opens the opposite annular groove and the other shoulder closes the other opposite annular groove, specifically, when the valve core 2 is at the left end limit position, i.e. abuts against the bottom of the blind hole 5, the first shoulder 13 opens the first oil inlet window A, the second shoulder 14 closes the second oil inlet window B, and when the valve core 2 is at the right end limit position, i.e. abuts against the inner end surface of the plug 4, the first shoulder 13 closes the first oil inlet window A, and the second shoulder 14 opens the second oil inlet window B; the shoulder divides the blind hole 5 into three chambers: the control cavity 15, the switching cavity 16 and the reset cavity 17 are formed by the outer side surface of the first shoulder 13 and the bottom of the blind hole 5, a cavity surrounded by the inner side surfaces of the 2 shoulders is the switching cavity 16, and a cavity where the outer side surface of the second shoulder 14 is located is the reset cavity 17; wherein the control chamber 15 and the reset chamber 17 are chambers of variable volume; the control cavity 15 is communicated with the second oil inlet 11 through an oil way in the shell, the reset cavity 17 is communicated with the first oil inlet 10 through an oil way in the shell, the switching cavity 16 is controllably communicated with the second oil inlet 11 or the first oil inlet 10, and the switching cavity 16 is communicated with the oil outlet 12 through an oil way in the shell;
the matching surface of the outer diameter of the convex shoulder of the valve core 2 and the inner diameter of the blind hole 5 of the shell 1 is matched by grinding, and the matching clearance is 0.0015-0.0035mm;
when the control cavity 15 is pressureless, the valve core 2 is positioned by the spring 3, so that the valve rod at the inner end of the valve core 2 abuts against the bottom of the blind hole 5;
the valve core 2 is made of steel;
the spring 3 is arranged in the reset cavity 17; the spring 3 is positioned between the outer end of the valve core 2 and the plug 4; the spring 3 is sleeved on the valve rod at the outer end of the valve core 2, one end of the spring 3 abuts against the inner end face of the plug 4, and the other end of the spring 3 abuts against the large end face of the outer end of the valve core 2, namely the outer end face of the second shoulder 14 of the valve core 2;
the plug 4 is arranged in a stepped threaded hole 6 at the orifice part of the blind hole 5 of the shell 1 and used for plugging the blind hole 5 of the shell 1; the plug 4 is a T-shaped plug screw and comprises a threaded head and a neck, wherein the threaded head is screwed into the stepped threaded hole 6 and is fixedly connected with the shell 1 into a whole through threaded connection, so that the structural integrity of the shell 1 is ensured to bear the internal hydraulic force; the neck rod is inserted into the blind hole 5 of the shell 1, the diameter of the neck rod is in sliding fit with the blind hole 5 of the shell 1, the plug 4 is provided with a sealing ring groove, and a sealing ring 18 and a check ring 19 are arranged in the sealing ring groove to prevent oil from leaking out;
the operation process of the invention is as follows:
in an initial state, namely under the condition of no brake, the first oil inlet 10 and the second oil inlet 11 are not supplied with pressure, the control cavity 15 is not acted by hydraulic pressure, the valve core 2 is in a left limit position under the action of the elasticity of the spring 3, the valve rod at the left end abuts against the bottom of the blind hole 5, the first shoulder of the valve core 2 is positioned at the left side of the first oil inlet, the first annular groove 7 is exposed, namely, the first oil inlet window A is opened, the second shoulder of the valve core 2 shields the second annular groove 8, namely, the second oil inlet window B is closed, and the switching cavity 16 is kept communicated with the first oil inlet 10. During normal braking, the first oil inlet 10 supplies oil, the oil outlet 12 is communicated with the switching cavity 16, and hydraulic oil is conveyed to the wheel braking device for braking through the oil outlet 12.
When the normal braking system of the aircraft fails, the pilot can operate the emergency braking system. When emergency braking is carried out, the first oil inlet 10 is not provided with pressure, the second oil inlet 11 is provided with pressure, hydraulic oil of the second oil inlet 11 enters the control cavity 15, the control cavity 15 obtains control hydraulic pressure, the valve core 2 is pushed to move rightwards under the action of the control hydraulic pressure until the valve rod at the right end abuts against the inner end face of the plug 4, at the right limit position, the second shoulder of the valve core 2 exposes the second annular groove 8, namely the second oil inlet window B is opened, meanwhile, the first shoulder of the valve core 2 shields the first annular groove 7, namely the first oil inlet window A is closed, the switching cavity 16 is communicated with the second oil inlet 11, the second oil inlet 11 is communicated with the oil outlet 12 through the switching cavity 16, and the oil outlet 12 conveys hydraulic oil to the wheel braking device for braking, so that the switching of an oil way from normal to emergency pressure sources is realized.
When the pilot releases the brake and the emergency brake is finished, the second oil inlet 11 is not supplied with pressure, the control cavity 15 controls the hydraulic pressure to disappear, the valve core 2 returns to the initial state under the action of the elastic force of the spring 3, namely the second shoulder of the valve core 2 closes the second oil inlet window B, and the first shoulder of the valve core 2 opens the first oil inlet window A. The first oil inlet 10 is communicated with the oil outlet 12 through the switching cavity 16, and outputs the braking pressure of the normal braking system through the switching valve.
Optionally, the reset cavity 17 is communicated with the external atmosphere, or the reset cavity 17 is connected with an oil return pipeline of an aircraft brake system, or is communicated with an air-oil conduit of the aircraft system.
Referring to fig. 3, the reset chamber 17 may have a fine hole at the center of the plug 4 as a vent hole 21 of the reset chamber 17, similar to the outside atmosphere, to prevent the reset chamber 17 from being choked. The diameter of the vent 21 is 1.5-2.5mm. The plug 4 does not require the installation of the sealing ring 18 and the retainer ring 19. As the service time increases, the oil accumulated in the reset chamber 17 increases, and the oil can be discharged from the vent hole 21. At this time, the plug 4 shown in fig. 1 becomes the bandpass plug 20.
Referring to fig. 4, the reset cavity 17 is connected with an oil return pipeline of an aircraft brake system or is communicated with an air oil conduit of the aircraft system, and an external pipeline is needed. At this point, the plug 4 is replaced by a filler neck 22, see fig. 4. The center of the inner end surface of the filler neck 22 is provided with a communication hole 23, and the diameter of the communication hole 23 is 2-3mm and is smaller than the diameter of the valve rod of the valve core 2.
The reset cavity 17 is communicated with the first oil inlet 10, so that external connection is saved, weight is reduced, the valve core 2 can be ensured to be in an initial position under the pressure action of a normal brake system, and the first oil inlet 10 is ensured to be smoothly connected with the oil outlet 12. The reset cavity 17 is communicated with the first oil inlet 10, the outer end surface of the second shoulder 14 acts on hydraulic pressure, so that the valve core 2 moves to and is kept at the left limit position, the normal brake system is ensured to supply pressure, the oil pressure of the normal brake system is output from the oil outlet 12 through the switching cavity 16, and the sliding switching valve is equivalent to a section of pipeline.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.

Claims (10)

1. A sliding switch valve, characterized in that: comprises a shell (1), wherein the inner cavity of the shell is provided with a self-adaptive valve core and an elastic part along the axial direction in sequence;
the self-adaptive valve core comprises a valve rod, and two self-adaptive molded surfaces are axially arranged on the peripheral surface of the valve rod; the section of the valve rod is smaller than the section of the inner cavity of the shell, and the valve rod can axially slide in the inner cavity of the shell; the two self-adaptive molded surfaces divide the inner cavity of the shell into a control cavity (15), a switching cavity (16) and a reset cavity (17) in turn along the axial direction, and the elastic component is positioned in the reset cavity (17);
the elastic component and the oil pressure in the control cavity (15) generate reverse acting force along the axial direction on the valve rod, and the position of the valve rod in the inner cavity is controlled; when the oil way is switched, the oil inlet is plugged and closed before switching through the self-adaptive molded surface.
2. A sliding switch valve as claimed in claim 1, wherein: the shell (1) is provided with a first oil inlet (10) connected with a normal oil supply system pipeline, a second oil inlet (11) connected with an emergency oil supply system pipeline, an oil outlet (12) connected with an execution device pipeline, three oil ports are distributed and communicated with the inner cavity of the shell through oil ways arranged in the shell, and the communication ports are a first oil inlet window (A), a second oil inlet window (B) and a third oil outlet window (C) respectively;
in a free state of the elastic component, the self-adaptive valve core is abutted against one side wall surface of the inner cavity of the shell under the action of elastic force, meanwhile, the second oil inlet window (B) is blocked and closed by one self-adaptive molded surface of the valve rod, and oil flows out from the oil outlet (12) through the first oil inlet (10), the first oil inlet window (A), the switching cavity (16) and the third oil outlet window (C); under the pressure state of the elastic component, the self-adaptive valve core is propped against the other side wall surface of the inner cavity of the shell under the action of oil pressure in the control cavity (15), meanwhile, the first oil inlet window (A) is blocked and closed by the other self-adaptive molded surface of the valve rod, and oil flows out from the oil outlet (12) through the second oil inlet (11), the second oil inlet window (B), the switching cavity (16) and the third oil outlet window (C).
3. A sliding switch valve as claimed in claim 2, wherein: the shell (1) is of a block structure, one end of the shell is provided with a blind hole, and the orifice is blocked by a plug (4) to form an inner cavity; in the inner cavity, the self-adaptive valve core is positioned at one side of the hole bottom, and the elastic part is positioned at one side of the plug (4);
the oil inlet device is characterized in that a first oil inlet (10), an oil outlet (12) and a second oil inlet (11) are sequentially formed in the peripheral surface of the inner cavity along the axial direction, the first oil inlet (10) is communicated with a first oil inlet window (A) and a reset cavity (17) through an oil way arranged in the shell, the second oil inlet (11) is communicated with a second oil inlet window (B) and a control cavity (15) through an oil way arranged in the shell, the oil outlet (12) is communicated with a third oil outlet window (C) and a switching cavity (16) through an oil way arranged in the shell, and the switching cavity (16) is controlled to be communicated with the first oil inlet (10) or the second oil inlet (11).
4. A sliding switch valve according to claim 3, characterized in that: the first oil inlet window (A), the second oil inlet window (B) and the third oil outlet window (C) are three annular grooves arranged on the peripheral surface of the blind hole, and an inlet or an outlet communicated with the oil way is formed in the lower part of each groove.
5. A sliding switch valve as set forth in claim 4, wherein: the two self-adaptive molded surfaces of the self-adaptive valve core are two shaft shoulders arranged on the valve rod, the axial width of the shaft shoulders is larger than the width of the notch of the annular groove, and the notch can be completely plugged; the first shaft shoulder (13) is close to one side of the hole bottom, and the second shaft shoulder (14) is close to one side of the plug (4); in the free state of the elastic part, the annular groove of the second oil inlet window (B) is blocked by the outer peripheral surface of the second shoulder (14); the annular groove of the first oil inlet window (A) is blocked by the outer peripheral surface of the first shaft shoulder (13) under the compression state of the elastic part.
6. A sliding switch valve as set forth in claim 5, wherein: the elastic component is a spring (3), one end of the spring is sleeved on the valve rod and abuts against the outer end face of the second shoulder, and the other end of the spring abuts against the inner side face of the plug (4).
7. A sliding switch valve as set forth in claim 6, wherein: the plug (4) is a T-shaped rotary body plug screw and comprises a threaded head and a neck, wherein the threaded head is screwed into a blind hole orifice of the shell (1) through threads; the neck rod is inserted into the blind hole and is in clearance fit with the blind hole;
the plug (4) is provided with a vent hole (21) along the central shaft and is used for communicating the reset cavity (17) with the external atmospheric pressure to prevent the reset cavity (17) from holding breath.
8. A sliding switch valve as set forth in claim 6, wherein: the plug (4) is a filler neck, a communication hole is formed along the central shaft and is communicated with an oil return pipeline or an air-oil conduit of an aircraft system, and an external pipeline is needed.
9. A sliding switch valve as set forth in claim 6, wherein: the sealing ring groove is formed in the contact surface of the plug (4) and the blind hole along the circumferential direction, and a sealing ring (18) and a check ring (19) are arranged in the sealing ring groove to prevent oil from leaking outwards.
10. An application of a sliding switching valve, characterized in that: the sliding switching valve is applied to switching of a pressure supply oil way when an aircraft brakes;
in an initial state, namely under the condition of no brake, the first oil inlet (10) and the second oil inlet (11) are not supplied with pressure, the control cavity (15) is not acted by hydraulic pressure, the valve core 2 is positioned at one side limit position of the inner cavity under the action of the elastic force of the spring (3), the valve rod is abutted against the bottom of the hole of the blind hole (5), the first shoulder of the valve core 2 is positioned at the left side of the first oil inlet (10) and exposes the first annular groove (7), namely the first oil inlet window (A) is opened, the second shoulder of the valve core 2 shields the second annular groove (8), namely the second oil inlet window (B) is closed, and the switching cavity (16) is communicated with the first oil inlet (10);
when the brake is in a normal state, the first oil inlet (10) supplies oil, the first oil inlet is communicated with the oil outlet (12) through the switching cavity (16), and hydraulic oil is conveyed to the wheel brake device through the oil outlet (12) for braking;
when the brake is in a system failure state, the pilot starts an emergency brake system; when emergency braking is carried out, the first oil inlet (10) is not supplied with pressure, the second oil inlet (11) supplies pressure, hydraulic oil of the second oil inlet (11) enters a control cavity (15), the control cavity (15) is controlled to obtain control hydraulic pressure, the valve core (2) is pushed to move rightwards under the action of the control hydraulic pressure until a right end valve rod abuts against the inner end face of the plug (4), at the right limit position, a second shoulder (14) of the valve core (2) exposes a second annular groove (8), namely a second oil inlet window (B) is opened, meanwhile, the first shoulder (13) of the valve core (2) shields the first annular groove (7), namely closes the first oil inlet window (A), the switching cavity (16) is kept communicated with the second oil inlet (11), the second oil inlet (11) is kept communicated with the oil outlet (12) through the switching cavity (16), and the oil outlet (12) conveys hydraulic oil to a wheel braking device to brake, and switching of an oil way from a normal to an emergency pressure supply source is realized;
when the emergency braking is finished, the second oil inlet (11) is not supplied with pressure, the control cavity (15) controls the hydraulic pressure to disappear, the valve core 2 returns to an initial state under the action of the elastic force of the spring (3), namely, a second shoulder (14) of the valve core (2) closes a second oil inlet window (B), and a first shoulder (13) of the valve core (2) opens a first oil inlet window (A); the first oil inlet (10) is communicated with the oil outlet (12) through the switching cavity (16), and outputs the braking pressure of the normal braking system through the switching valve.
CN202310453011.4A 2023-04-25 2023-04-25 Sliding change-over valve and application Pending CN116538318A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310453011.4A CN116538318A (en) 2023-04-25 2023-04-25 Sliding change-over valve and application

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310453011.4A CN116538318A (en) 2023-04-25 2023-04-25 Sliding change-over valve and application

Publications (1)

Publication Number Publication Date
CN116538318A true CN116538318A (en) 2023-08-04

Family

ID=87451638

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310453011.4A Pending CN116538318A (en) 2023-04-25 2023-04-25 Sliding change-over valve and application

Country Status (1)

Country Link
CN (1) CN116538318A (en)

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