CN114109612B

CN114109612B - Metering valve assembly

Info

Publication number: CN114109612B
Application number: CN202111450009.9A
Authority: CN
Inventors: 王羽熙; 陈君辉; 邓熠; 陈川; 李彬杰
Original assignee: Sichuan Aerospace Fenghuo Servo Control Technology Co ltd
Current assignee: Sichuan Aerospace Fenghuo Servo Control Technology Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2023-03-21
Anticipated expiration: 2041-11-30
Also published as: CN114109612A

Abstract

The invention provides a metering valve assembly, which comprises a valve sleeve and a valve core, wherein the valve sleeve is provided with a valve sleeve inlet and a valve sleeve throttling outlet, the middle part of the valve core is provided with an annular groove, and the valve sleeve inlet and the valve sleeve throttling outlet are coaxially distributed and are vertically arranged in a direction perpendicular to the movement direction of the valve core; and sealing elements are arranged at the valve sleeve inlet and the valve sleeve throttling outlet, and can isolate the pressure in four directions, so that high-efficiency sealing is realized. The metering valve assembly with the structure has the advantages that the fuel inlet and the fuel outlet are coaxially distributed, the fuel inlet and the fuel outlet are effectively isolated from the control pressure at the left end and the right end of the valve core, meanwhile, the lengths of the valve sleeve and the valve core element are shortened, the on-way pressure loss of fluid is small, the valve assembly is miniaturized and lightened, and the purposes of compact and light structure of a fuel regulating system are further achieved.

Description

Metering valve assembly

Technical Field

The invention relates to the technical field of engine control, in particular to a metering valve assembly.

Background

In the engine control link, the oil supply precision of the fuel regulator directly determines the stability of the engine rotating speed, and the oil supply precision depends on the response speed and the stability of the metering valve control loop.

The oil supply quantity of the fuel regulator is determined by a flow area A formed by matching the regulating valve core 02 of the metering valve assembly with the valve sleeve 01-shaped hole and a fuel inlet-outlet pressure difference delta P flowing through the flow area A. Under a certain working condition, the delta P is determined by a constant pressure valve in the fuel regulator system, and the delta P is a constant value. Therefore, the flow area a needs to be changed to control the fuel flow, that is, the displacement of the valve core 02 is controlled to realize the accurate control of the flow.

At present, most of metering valve assemblies in the market are sealed by common O-shaped sealing rings, oil inlets and oil outlets are designed in an staggered mode in the axial direction, so that the valve sleeve 01 and the valve core 02 are overlong, the whole assembly structure is dispersed, the volume and the mass of the whole fuel regulator are further larger, a flow channel is longer, the pressure loss of fluid along the way is larger, and the temperature rise is quicker in the fuel using process.

Disclosure of Invention

The invention provides a metering valve assembly, which effectively solves the technical problem.

The invention provides a metering valve assembly, which comprises a valve sleeve and a valve core arranged in an inner cavity of the valve sleeve, wherein the valve sleeve is provided with a valve sleeve inlet and a valve sleeve throttling outlet, the middle part of the valve core is provided with an annular groove, and the valve sleeve inlet and the valve sleeve throttling outlet are coaxially distributed and are vertically arranged in a direction perpendicular to the movement direction of the valve core; sealing elements are arranged at the valve sleeve inlet and the valve sleeve throttling outlet, and the sealing elements can isolate pressure in four directions; under the drive of the oil pressure difference at the two ends of the valve core, the valve sleeve inlet, the annular groove and the valve sleeve throttling outlet form a variable throttling channel with the flow area linearly changing.

Preferably, damping string installation cavities are distributed on two sides of the valve core, which are positioned in the annular groove, damping strings for inhibiting pressure fluctuation are installed in the damping string installation cavities, the throttling inlet of the valve core is communicated with the two damping string installation cavities through a liquid channel, and the damping strings are provided with damping hole systems for blocking flow.

Preferably, the damping rings of the damping string are distributed on the shaft core at equal intervals.

Preferably, the damping string is of an integrally formed structure.

Preferably, the sealing member includes a sealing ring and a guide ring, the guide ring is installed in the installation groove of the valve housing, and the sealing ring is installed inside the guide ring.

Preferably, the valve further comprises a plug assembly mounted at the inner end of the valve core and a displacement sensor fixed to the plug assembly and used for detecting the movement position of the valve core, and the displacement sensor is in communication connection with a control system to form a closed loop for accurately controlling the position of the valve core.

Preferably, the outer peripheral surface of the valve core is provided with a pressure equalizing groove for preventing the valve core from being clamped.

Preferably, the damping string is a copper alloy damping string.

The metering valve assembly provided by the invention adopts a fuel inlet and outlet coaxial distribution structure and a structure that sealing parts are arranged at the inlet and the outlet of the valve sleeve, so that the pressures in four directions of P1, P2, P3 and P4 are effectively isolated, the high-efficiency sealing is realized, meanwhile, the lengths of the valve sleeve and the valve core element are shortened, the pressure loss of fluid along the way is small, the integral system structure is compact, and the miniaturization and the light weight of the valve assembly are realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a metering valve assembly of the prior art;

FIG. 2 is a schematic structural view of a metering shutter assembly according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

fig. 4 is a schematic structural view of the valve sleeve of fig. 2;

FIG. 5 is a schematic structural view of the valve cartridge of FIG. 2;

FIG. 6 is a schematic structural diagram of the damping string of FIG. 2;

fig. 7 is a schematic structural view of the sealing ring in fig. 2.

Wherein, 1-valve sleeve, 2-valve core, 3-damping string, 4-plug, 5-plug component, 6-displacement sensor, 7-guide ring, 8-sealing ring; 11-a valve sleeve inlet, 12-a valve sleeve throttling outlet, 21-an annular groove, 22-a pressure equalizing groove and 31-a damping hole system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 2 and 3, fig. 2 is a schematic structural view of a metering shutter assembly according to an embodiment of the present invention; fig. 3 is a cross-sectional view of fig. 2.

The invention provides a metering valve assembly, which mainly comprises a valve sleeve 1, a valve core 2 and a sealing element, wherein the valve core 2 is arranged in an inner cavity of the valve sleeve 1, the center of the valve core 2 is provided with an annular groove 21, the valve sleeve 1 is provided with a valve sleeve inlet 11 and a valve sleeve throttling outlet 12, and the valve sleeve inlet 11 and the valve sleeve throttling outlet 12 are coaxially arranged; the valve sleeve inlet 11 and the valve sleeve throttle outlet 12 are arranged perpendicular to the direction of movement of the valve core 2 and are arranged coaxially.

In addition, sealing elements are arranged at the valve sleeve inlet 11 and the valve sleeve throttling outlet 12, the sealing elements can effectively realize pressure isolation in four directions P1, P2, P3 and P4, and under the driving of oil pressure difference at two ends of the valve core 2, the valve sleeve inlet 11, the annular groove 21 and the valve sleeve throttling outlet 12 form a variable throttling channel with a linearly-changed flow area.

The design that the valve bush inlet 11 and the valve bush throttling outlet 12 are coaxially distributed and sealed by the sealing piece is adopted in the application, the fuel inlet and outlet and the control pressure at the left end and the right end of the valve core 2 are effectively isolated, and compared with the traditional structure that an O-shaped sealing ring is used for sealing, the oil inlet and the oil outlet are staggered in the axial direction, the length of the valve bush 1 and the valve core 2 is shortened, the whole system is compact in structure, small in appearance and light in weight.

In order to suppress pressure fluctuation, a damping string 3 may be disposed in the valve core 2, specifically, damping string installation cavities are distributed on two sides of the valve core 2, which are located at the valve core throttling inlet 21, the valve core throttling inlet 21 and the two damping string installation cavities are communicated through a liquid channel, as shown in fig. 3, the damping string 3 is installed inside the damping string installation cavity, and the end part is sealed by a plug 4. The oil entering from the valve core throttling inlet 21 enters the two damping string mounting cavities through the liquid channel communication at the two sides, and is blocked by the damping strings 3, so that the flow velocity of the oil is reduced, and the technical effects of stabilizing the pressure and suppressing the pressure fluctuation are achieved.

Refer to fig. 6. The damping string 3 is provided with a damping hole system 31 for suppressing pressure fluctuation and having a flow-blocking function, and the damping hole system 31 is ensured by precision machining. The damping string 3 is preferably, but not limited to, an integrally formed structure, for example, it may be welded to ensure the connection strength.

The damping rings of the damping strings 3 are preferably distributed on the shaft cores of the damping strings 3 at equal intervals, so that the processing is convenient, and the flow blocking effect is stable. The damping strings 3 are preferably, but not limited to, copper alloy damping strings.

The apertures of the orifice systems 31 can be designed according to actual requirements, for example, the apertures of the orifice systems 31 can be distributed in a staggered manner in the flow direction, or distributed with equal aperture, or arranged in equal proportion, and so on. The specific structure of the damping string 3 and the aperture of the damping hole system 31 need to be designed in a simulation manner and calibrated in combination with the test condition, so as to achieve the purpose of suppressing the pressure fluctuation, which is not limited herein.

Refer to fig. 3, 4 and 7. In one embodiment, the sealing member comprises a sealing ring 8 and a guide ring 7, the guide ring 7 is installed in the installation groove of the valve housing 1 to facilitate the installation of the guide ring 7, and the sealing ring 8 is installed inside the guide ring 7 through the guide ring 7. The guide ring 7 is preferably made of polytetrafluoroethylene materials with low friction coefficient and good stability, the sealing ring 8 is preferably made of oil-resistant fluorosilicone rubber with good ductility, and the sealing performance is guaranteed through compression deformation of the fluorosilicone rubber. The contact surface of sealing ring 8 and valve body is scribbled industry temperature resistant and is glued, firmly fixes sealing ring 8, can prevent effectively that sealing ring 8 from rotating.

On the basis of above-mentioned embodiment, still including installing displacement sensor 6 and the plug subassembly 5 on case 2, plug subassembly 5 is installed in the tip central point of case 2, displacement sensor 6 sets up in the one end that case 2 deviates from plug subassembly 5, displacement sensor 6 and the coaxial setting of plug subassembly 5, displacement sensor 6's middle part dead lever is fixed in plug subassembly 5, carry out the clamping by plug subassembly 5's tip chuck, detect the motion position of case 2 through displacement sensor 6, displacement sensor 6 is connected with the control system communication, in order to form the closed loop of accurate control case 2 position.

Specifically, the pressures at the two ends of the valve core 2 are respectively controlled by a digital valve at the rear end of the fuel regulating system, pressure values P2 and P3 at the two ends of the valve core 2 are controlled by controlling a high-frequency switch of the digital valve, the valve core 2 is driven by the pressure difference value at the two ends of the valve core 2 to move left and right, and a variable throttling opening is formed by a throttling sharp edge of the valve core 2 and a fixed throttling window of the valve sleeve 1 in the movement process of the valve core 2, so that the flow area is controlled, and the fuel flow control is realized; the valve core 2 moves to drive the displacement sensor 6 to act, the movement of the displacement sensor 6 and a control system form a closed loop, and then the position of the valve core 2 is accurately controlled, so that the accurate regulation and control of the fuel flow are achieved.

In addition, the outer peripheral face of case 2 is equipped with a plurality of pressure-equalizing grooves 22, and pressure-equalizing grooves 22 are the cell body that distributes in the outer peripheral face of case 2, and each pressure-equalizing grooves 22 distributes along the axial, and pressure-equalizing grooves 22's setting can prevent that case 2 card from dying, avoids leading to the system failure because of case 2 card is dying, plays safety protection's effect.

The application provides a measurement valve assembly's work flow does: the pressure oil P1 enters the valve core annular groove 21 from the valve sleeve inlet 11 and is divided into three paths: the first path enters a control cavity at the left end of the valve core 2 through the damping string 3 at the left end of the valve core 2, the second path enters the control cavity at the right end of the valve core 2 through the damping string at the right end of the valve core 2, and the third path directly reaches an outlet matched with the valve core 2 and the valve sleeve 1 through the annular groove 21; the pressure at the left end and the pressure at the right end of the valve core 2 are respectively adjusted in a coordinated mode through a digital valve at the rear end of a fuel adjusting system corresponding to the pressure, a position logic program of which the fuel supply quantity represented by the duty ratio of the digital valve corresponds to the stroke of the valve core 2 is prestored in a control system, the digital valve is controlled by the control program to select the duty ratio to adjust the stroke of the valve core 2 under the regulation and control of the control system, and the displacement sensor 6 detects the actual displacement of the valve core 2 in real time and feeds the actual displacement back to the control system so as to realize dynamic closed loop of valve core position feedback.

The damping string 3 is preferably made of a copper alloy with good ductility, which facilitates machining and assembly.

When the metering valve assembly is assembled, the guide ring 7 is required to be installed into one end of the sealing groove of the valve body at first, then the industrial temperature-resistant glue is smeared on the contact surface of the valve body and the sealing ring 8, then the sealing ring 8 is installed, the rest of the guide rings 7 are installed, and after the industrial temperature-resistant glue is solidified, other elements are installed to complete the assembly of the metering valve assembly. The metering valve assembly needs to be installed in a shell of the fuel regulator, and the sealing ring 8 is in a compression state after being matched with a corresponding hole of the shell and has a designed compression amount, so that pressure in four directions (P1, P2, P3 and P4) can be effectively isolated. The sealing form effectively shortens the valve core length of the valve sleeve while ensuring the sealing function, so that the whole system has compact structure, small pressure loss of fluid along the way, less sealing elements used at the same time, reliable system operation and lower cost.

It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The metering valve assembly provided by the present invention has been described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A metering valve assembly comprises a valve sleeve (1) and a valve core (2) arranged in an inner cavity of the valve sleeve (1), wherein the valve sleeve (1) is provided with a valve sleeve inlet (11) and a valve sleeve throttling outlet (12), and the valve core (2) is provided with an annular groove (21), and is characterized in that the valve sleeve inlet (11) and the valve sleeve throttling outlet (12) are coaxially distributed and are vertically arranged perpendicular to the movement direction of the valve core (2); sealing elements are arranged at the valve sleeve inlet (11) and the valve sleeve throttling outlet (12), and the sealing elements can isolate pressure in four directions; under the drive of the oil pressure difference at two ends of the valve core (2), the valve sleeve inlet (11), the annular groove (21) and the valve sleeve throttling outlet (12) form a variable throttling channel with the flow area linearly changing;

damping string mounting cavities are distributed on two sides of the valve core (2) positioned in the annular groove (21), damping strings (3) used for suppressing pressure fluctuation are mounted in the damping string mounting cavities, the annular groove (21) is communicated with the two damping string mounting cavities through a liquid channel, and damping hole systems (31) playing a role in flow resistance are arranged on the damping strings (3);

the pressure oil P1 enters the valve core annular groove (21) from the valve sleeve inlet (11) and is divided into three paths: the first path enters a control cavity at the left end of the valve core (2) through the damping string (3) at the left end of the valve core (2), the second path enters the control cavity at the right end of the valve core (2) through the damping string at the right end of the valve core (2), and the third path directly reaches an outlet matched with the valve core (2) and the valve sleeve (1) through the annular groove (21); the pressure at the left end and the pressure at the right end of the valve core (2) are respectively adjusted in a coordinated mode through a digital valve at the rear end of a fuel adjusting system corresponding to the pressure, a control system prestores a position logic program of fuel supply quantity represented by a digital valve duty ratio corresponding to the stroke of the valve core (2), and the digital valve is controlled to select the duty ratio through the control program to adjust the stroke of the valve core (2) under the regulation and control of the control system.

2. The metering shutter assembly according to claim 1, characterized in that the damping rings of the damping string (3) are equally spaced around the axial core.

3. The metering shutter assembly according to claim 2, characterized in that the damping string (3) is of one-piece construction.

4. Metering shutter assembly according to claim 1, characterized in that the sealing means comprise a sealing ring (8) and a guiding ring (7), the guiding ring (7) being mounted in a mounting groove of the valve sleeve (1), the sealing ring (8) being mounted inside the guiding ring (7).

5. The metering valve assembly according to any one of claims 1 to 4, further comprising a plug assembly (5) mounted at the inner end of the valve element (2) and a displacement sensor (6) fixed to the plug assembly (5) for detecting the movement position of the valve element (2), wherein the displacement sensor (6) is in communication connection with a control system to form a closed loop for accurately controlling the position of the valve element (2).

6. The metering shutter assembly according to claim 1, characterized in that the outer circumference of the valve core (2) is provided with a pressure equalization groove (22) for preventing the valve core (2) from jamming.

7. Metering shutter assembly according to claim 1, characterized in that the damping string (3) is in particular a copper alloy damping string.