CN102980622B - Design and adjusting method for fuel oil metering device starting flow characteristics - Google Patents
Design and adjusting method for fuel oil metering device starting flow characteristics Download PDFInfo
- Publication number
- CN102980622B CN102980622B CN201210436383.8A CN201210436383A CN102980622B CN 102980622 B CN102980622 B CN 102980622B CN 201210436383 A CN201210436383 A CN 201210436383A CN 102980622 B CN102980622 B CN 102980622B
- Authority
- CN
- China
- Prior art keywords
- metering
- fuel
- flow
- spool
- valve
- 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.)
- Active
Links
Abstract
Disclosed is a design and adjusting method for fuel oil metering device starting flow characteristics. The design and adjusting method for the fuel oil metering device starting flow characteristics includes the following six steps: 1) a valve adopting a rectangular fuel window is calculated by adopting a constant pressure difference fuel oil metering flow metering method so that the starting flow characteristics are linear; 2) a bypass adjusting element is arranged so that an intercept of the starting flow characteristics can be adjusted; 3) a fuel oil metering device is used as a standard part, the parameters such as pressure intensity difference of differential pressure valves or differential pressure fuel oil return valves, a metering valve core initial position feedback value, metering valve oil fuel control window width and bypass adjusting element circulation area are respectively in the middle range of design allowable errors; 4) the installation position of a metering valve core displacement sensor is adjusted; 5) a rake ratio of an adjusted product starting flow characteristics are enabled to be equal to that of the standard part; 6) the intercept of the adjusted product starting flow characteristics can be equal to that of the standard part. The design and adjusting method for the fuel oil metering device starting flow characteristics has the advantages that uniformity of the starting flow characteristics can be greatly improved, and good interchangeability of the fuel oil metering device can be ensured.
Description
Technical field
The present invention relates to the fuel-metering device design and layout field of aeromotor or ground combustion machine digital and electronic formula control system, particularly a kind of fuel-metering device start-up flow characteristics design and method of adjustment.
Background technology
In aeromotor or ground combustion machine digital and electronic formula control system, fuel-metering device is the topworks of control system, mainly in order to realize fuel flow metering function.Start-up flow characteristic is exactly the fuel-metering device discharge characteristic corresponding with aeromotor or ground combustion machine start-up period.Start-up flow characteristic directly affects the starting effect of aeromotor or ground combustion machine, therefore answers intense adjustment, makes the same model fuel-metering device of batch production have consistent start-up flow characteristic, to ensure the interchangeability of fuel-metering device.
There is no the design of effective fuel-metering device discharge characteristic and method of adjustment, often run into the large problem of start-up flow property difference of different component parts for assembly of a machine fuel-metering device, have impact on the interchangeability of product.
The fuel-metering device of mechanical hydraulic-pressure type control system, usually the multiple start-up flow characteristic adjustment element that can be adjusted by user is designed with, its start-up flow characteristic can according to the adjustment of service condition scene on complete machine, therefore mechanical hydraulic-pressure type control system is relatively looser to the requirement of fuel-metering device start-up flow characteristic coherency, be easy to realize.And the use burden in order to reduce user, digital and electronic formula control system requires that fuel-metering device can not arrange the element needing user to adjust, and its start-up flow characteristic coherency must be solved by the design of fuel-metering device self and debugging, and difficulty is larger.
Summary of the invention
The object of the invention is to solve in aeromotor or ground combustion machine digital and electronic formula control system, fuel-metering device is without effective start-up flow characteristics design and method of adjustment problem, and spy provides a kind of fuel-metering device start-up flow characteristics design and method of adjustment.
The invention provides a kind of fuel-metering device start-up flow characteristics design and method of adjustment, it is characterized in that: described fuel-metering device start-up flow characteristics design and method of adjustment divide following 6 steps:
1) fuel-metering device adopts level pressure difference fuel flow metering method, and metering valve wherein adopts or part adopts rectangle control oil window, makes start-up flow characteristic be linear;
2) the bypass adjustment element that a circulation area in parallel with metering valve is adjustable is set, makes the intercept adjustable of start-up flow characteristic;
3) fuel-metering device is as standard component, and the parameter such as its differential pressure valve differential pressure oil return valve pressure difference, metering valve spool initial position value of feedback, metering valve control oil window width, bypass adjustment element circulation area all should in the intermediate range of design tolerance; Enroll the start-up flow characteristic of this standard component and the initial position value of feedback of metering valve, as the standard value of other product to be adjusted;
4) adjusting the installation site of metering valve valve core displacement sensor, making the initial position value of feedback by adjusting gauging of products valve spool identical with standard component;
5) by changing the slope of the pressure spring pretightning force adjustment start-up flow characteristic of differential pressure valve differential pressure oil return valve, make the slope by adjusting product start-up flow characteristic identical with standard component;
6) by changing the intercept of the circulation area adjustment start-up flow characteristic of bypass adjustment element, make the intercept by adjusting product start-up flow characteristic identical with standard component.
Described metering method is
Adopt the method for fuel-metering device metering fuel flow:
According to hydromechanical relevant knowledge, the flow Q flowing through a restricting element is relevant with front and back pressure difference Δ P with its circulation area A, that is:
Wherein, K is constant.
Keep the element of function that the pressure difference Δ P in above formula is remained steady state value if use one to have pressure difference, then now, the flow flowing through restricting element is only relevant with its circulation area.If the circulation area of restricting element is adjustable, we just can by regulating the metering of its circulation area realization to fuel flow.Here it is, and fuel-metering device measures the ultimate principle of fuel flow, and this principle is commonly referred to level pressure difference fuel flow metering principle.
Wherein, the restricting element that circulation area is adjustable is commonly referred to metering valve, and the window that metering valve area is adjustable changes circulation area, and its Shapes flow characteristic controlling oily window has material impact; Having pressure difference keeps the element of function to be commonly referred to differential pressure valve, and it is of a great variety, various informative, but all will be set the pressure difference of hope by the pretightning force of a spring.
Metering valve and differential pressure valve all have multiple different version, but the design of the present invention's elaboration and method of adjustment are to the basic structure no requirement (NR) of the two.Current domestic and international existing fuel-metering device, substantially all adopts above-mentioned principle of work, and namely the start-up flow design that the present invention sets forth and method of adjustment are applicable to adopt above-mentioned fuel flow to measure the fuel-metering device of principle.
Described fuel-metering device comprises metering valve and differential pressure valve, have a direct impact start-up flow characteristic and design thereof and method of adjustment, during the concrete structure of metering valve and differential pressure valve comprises, differential pressure valve is made up of spool 10, lining 11, pressure spring 9 etc., is the pressure reduction oil return valve integrating differential pressure measurement and oil return function;
Spool 10 lower end acts on fuel oil 1 pressure before metering valve, and upper end acts on the pretightning force of fuel oil 4 pressure and pressure spring 9 after metering valve, symmetrically on lining 11 has the oil return window 12 that fuel oil before metering valve 1 is returned low pressure oil back chamber by even number.Pressure difference before and after metering valve is determined by the pretightning force of pressure spring 9 and spool 10 area.When differential pressure valve is in steady state (SS), following relation can be obtained by the equilibrium equation of spool 10:
Wherein, F0: pressure spring 9 pretightning force, d: spool 10 diameter.
When pressure spring 9 rigidity is little, and when spool 10 change in displacement is less, can be similar to and think that pressure spring 9 pretightning force is constant, therefore before and after metering valve, pressure difference is steady state value.Also can be known by B formula, the pretightning force of adjustment pressure spring 9 can change the pressure difference before and after metering valve.During fuel-metering device steady operation, the power acted on spool 10 is balance.If certain disturbing factor destroys the dynamic balance of spool 10, spool 10 by adjustment oil return flow, will make its rebalancing automatically.To increase the oily flow of metering, it controls oily window 3 circulation area if make, the spool 5 of metering valve to move expansion, and the metering oil flow of fuel-metering device is increased, then because the flow resistance of metering valve declines, before metering valve, the pressure of fuel oil 1 will reduce.Before metering valve, the reduction of fuel oil 1 pressure makes differential pressure valve spool 10 move down, and reduce circulation area and the oil return flow of oil return window 12, before metering valve, fuel oil 1 pressure rises, then spool 10 comes back to the steady state (SS) of stress balance.
In order to increase the damping of differential pressure valve spool 10, making its stable movement, in the outlet oil circuit of pressure spring 9 place oil pocket, being provided with flow nipple 8.
Metering valve is made up of spool 5, lining 2, back-moving spring 6, displacement transducer 7 etc.Spool 5 drives by the control oil in upper and lower two chambeies, and control oil from the electro-hydraulic converting element controlled by electronic controller, can move up and down vertically, its position feeds back to electronic controller by displacement transducer 7, can realize accurate position-force control.On lining 2, symmetry has even number control oil window 3, and control oily window 3 part and covered by spool 5, the position of spool 5 determines the actual circulation area controlling oily window 3.Because the pressure difference before and after metering valve is remained steady state value by differential pressure valve, therefore it is only relevant with the actual circulation area of the oily window 3 of control to measure oily flow.Spool 5 moves time control oil window 3 actual circulation area to increase, the metering oil of output increases; Otherwise metering oil reduces.When fuel-metering device quits work, spool 5 is pressed to the initial position that control oil window 3 is closed completely by back-moving spring 6.
Control oil window 3 form of metering valve has: rectangle, triangle or circle, different shapes has different discharge characteristics.Discharge characteristic is exactly the corresponding relation of the oily flow of metering and metering valve spool 5 position, and also namely measure the corresponding relation of oily flow and metering valve spool 5 value of feedback, start-up flow characteristic is exactly the low discharge part of fuel-metering device bulk flow flow characteristic.
In the fuel-metering device of Digital electronic control system, adopt rectangle control oil window, or the array configuration of several sections of rectangular windows, reason is as follows: establish certain metering valve to have employed the rectangle control oil window shown in two Fig. 2, its width is L.With the initial position of spool for true origin, this spool has length to be the idle motion of S0, and S0 is the value of feedback that the oily window of control starts open position, when front opening length is S-S0.From above-mentioned A formula:
From C formula, according to rectangle control oil window, discharge characteristic is linear, see Fig. 3, very favourable to practical application, and the metering valve spool of Digital electronic control system only controls by electronic controller, can omnidistance step-less adjustment, therefore in the fuel-metering device of Digital electronic control system, usually adopt rectangle control oil window.
The slope of rectangle control oil window traffic characteristic line, is also referred to as flow gain, reflects the oily flow of metering to the sensitivity of metering valve spool displacement.Due in engineer applied, the limited precision of metering valve spool position closed-loop control, therefore need the relation of mating discharge characteristic line slope and spool position oscillating quantity.As shown in Figure 4, if spool has the ± oscillating quantity of Δ S at S point, then corresponding metering oil flow oscillating quantity ± Δ Q is:
In order to meet request for utilization, aeromotor or the metering oil flow oscillating quantity of ground combustion machine to fuel-metering device all have clear and definite accuracy requirement.In order to meet the requirements of flow accuracy, must limit the slope of discharge characteristic line.When known spool oscillating quantity ± Δ S and flow accuracy requirement ± Δ Q, the maximal value kmax of discharge characteristic line slope is determined by following formula:
Known by C formula, the slope of discharge characteristic line and pressure difference Δ P before and after metering valve and to control oily window width L relevant.Under the prerequisite that pressure difference Δ P has determined, the breadth extreme of rectangle control oil window can be determined by E formula.
Start-up flow characteristics design and method of adjustment principle analysis: due to the existence of mismachining tolerance, the discharge characteristic of different component parts for assembly of a machine fuel-metering device is inevitable variant, the object of fuel-metering device start-up flow characteristics design and adjustment is exactly by certain design and method of adjustment, multiple stage part fuel-metering device is made to have consistent start-up flow characteristic line, to meet aeromotor or ground combustion machine to the requirement of fuel-metering device interchangeability.
The start-up flow characteristics design that the present invention sets forth and method of adjustment are for employing level pressure difference fuel flow metering principle, and metering valve has the fuel-metering device of rectangle control oil window, known by C formula, its start-up flow characteristic is linear, can be determined by the slope of characteristic line and intercept.Therefore, as long as the slope of start-up flow characteristic line and intercept are convenient to regulate, multiple stage part fuel-metering device just can be made to have consistent start-up flow characteristic.
By C formula, can table 1 content:
Table 1 start-up flow characteristic line adjustment analytical table
As shown in Table 1, existing adjustment means only can ensure that the slope of start-up flow characteristic is consistent, and intercept cannot adjust.Therefore, adjustable means should be increased, make the intercept adjustable of start-up flow characteristic.
As shown in Figure 6, the present invention is provided with the adjustable bypass adjustment element of a circulation area in parallel with metering valve, by the adjustment to this bypass adjustment element circulation area, changes its flow, and then the start-up flow characteristic that adjustment fuel-metering device is total.The present invention, to the concrete structure no requirement (NR) of this bypass adjustment element, can be laminate flow controller, flow nipple or other special construction, as long as circulation area is convenient to adjust.
Because bypass adjustment element is in parallel with metering valve, before and after it, pressure difference is identical with metering valve is also steady state value, therefore the fuel flow flowing through this element is only relevant with the circulation area of himself, and total metering oil flow, being designated as Qsum, adjusting the flow sum of element for flowing through metering valve and bypass.If the fuel flow flowing through bypass adjustment element is Q0, then C formula becomes:
The fuel flow Q0 of bypass adjustment element can be adjusted by its circulation area, therefore the intercept also adjustable of start-up flow characteristic after increasing this element.
By taking level pressure difference fuel flow metering principle, metering valve employing rectangle control oil window, increasing bypass adjustment element three design measures, we just can obtain linear start-up flow characteristic, and by the slope of pressure spring pretightning force Adjustment Performance line, the intercept by bypass adjustment element circulation area Adjustment Performance line, make multiple stage part fuel-metering device have consistent start-up flow characteristic.
Advantage of the present invention:
Fuel-metering device start-up flow characteristics design of the present invention and method of adjustment, can significantly improve the consistance of start-up flow characteristic, ensures that fuel-metering device has good interchangeability.
Accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation:
Fig. 1 is differential pressure valve and metering valve schematic diagram;
Fig. 2 is rectangle control oil window schematic diagram;
Fig. 3 is rectangle control oil window traffic characteristic line schematic diagram;
Fig. 4 is that spool position swings and flow swings relation schematic diagram;
Fig. 5 is the oily window schematic diagram of rectangle combination control;
Fig. 6 is for increasing bypass adjustment element schematic;
Fig. 7 is start-up flow characteristics design and adjustment process flow diagram;
In figure: fuel oil before 1-metering valve; 2-lining; 3-controls oily window; Fuel oil after 4-metering valve; 5-spool; 6-back-moving spring; 7-displacement transducer; 8-flow nipple; 9-pressure spring; 10-spool; 11-lining; 12-oil return window.
Embodiment
Embodiment
Present embodiments provide a kind of fuel-metering device start-up flow characteristics design and method of adjustment, it is characterized in that: described fuel-metering device start-up flow characteristics design and method of adjustment divide following 6 steps:
1) fuel-metering device adopts level pressure difference fuel flow metering method, and metering valve wherein adopts or part adopts rectangle control oil window, makes start-up flow characteristic be linear;
2) the bypass adjustment element that a circulation area in parallel with metering valve is adjustable is set, makes the intercept adjustable of start-up flow characteristic;
3) fuel-metering device is as standard component, and the parameter such as its differential pressure valve differential pressure oil return valve pressure difference, metering valve spool initial position value of feedback, metering valve control oil window width, bypass adjustment element circulation area all should in the intermediate range of design tolerance; Enroll the start-up flow characteristic of this standard component and the initial position value of feedback of metering valve, as the standard value of other product to be adjusted;
4) adjusting the installation site of metering valve valve core displacement sensor, making the initial position value of feedback by adjusting gauging of products valve spool identical with standard component;
5) by changing the slope of the pressure spring pretightning force adjustment start-up flow characteristic of differential pressure valve differential pressure oil return valve, make the slope by adjusting product start-up flow characteristic identical with standard component;
6) by changing the intercept of the circulation area adjustment start-up flow characteristic of bypass adjustment element, make the intercept by adjusting product start-up flow characteristic identical with standard component.
Described metering method is
Adopt the method for fuel-metering device metering fuel flow:
According to hydromechanical relevant knowledge, the flow Q flowing through a restricting element is relevant with front and back pressure difference Δ P with its circulation area A, that is:
Wherein, K is constant.
Keep the element of function that the pressure difference Δ P in above formula is remained steady state value if use one to have pressure difference, then now, the flow flowing through restricting element is only relevant with its circulation area.If the circulation area of restricting element is adjustable, we just can by regulating the metering of its circulation area realization to fuel flow.Here it is, and fuel-metering device measures the ultimate principle of fuel flow, and this principle is commonly referred to level pressure difference fuel flow metering principle.
Wherein, the restricting element that circulation area is adjustable is commonly referred to metering valve, and the window that metering valve area is adjustable changes circulation area, and its Shapes flow characteristic controlling oily window has material impact; Having pressure difference keeps the element of function to be commonly referred to differential pressure valve, and it is of a great variety, various informative, but all will be set the pressure difference of hope by the pretightning force of a spring.
Metering valve and differential pressure valve all have multiple different version, but the design of the present invention's elaboration and method of adjustment are to the basic structure no requirement (NR) of the two.Current domestic and international existing fuel-metering device, substantially all adopts above-mentioned principle of work, and namely the start-up flow design that the present invention sets forth and method of adjustment are applicable to adopt above-mentioned fuel flow to measure the fuel-metering device of principle.
Described fuel-metering device comprises metering valve and differential pressure valve, have a direct impact start-up flow characteristic and design thereof and method of adjustment, during the concrete structure of metering valve and differential pressure valve comprises, differential pressure valve is made up of spool 10, lining 11, pressure spring 9 etc., is the pressure reduction oil return valve integrating differential pressure measurement and oil return function;
Spool 10 lower end acts on fuel oil 1 pressure before metering valve, and upper end acts on the pretightning force of fuel oil 4 pressure and pressure spring 9 after metering valve, symmetrically on lining 11 has the oil return window 12 that fuel oil before metering valve 1 is returned low pressure oil back chamber by even number.Pressure difference before and after metering valve is determined by the pretightning force of pressure spring 9 and spool 10 area.When differential pressure valve is in steady state (SS), following relation can be obtained by the equilibrium equation of spool 10:
Wherein, F0: pressure spring 9 pretightning force, d: spool 10 diameter.
When pressure spring 9 rigidity is little, and when spool 10 change in displacement is less, can be similar to and think that pressure spring 9 pretightning force is constant, therefore before and after metering valve, pressure difference is steady state value.Also can be known by B formula, the pretightning force of adjustment pressure spring 9 can change the pressure difference before and after metering valve.During fuel-metering device steady operation, the power acted on spool 10 is balance.If certain disturbing factor destroys the dynamic balance of spool 10, spool 10 by adjustment oil return flow, will make its rebalancing automatically.To increase the oily flow of metering, it controls oily window 3 circulation area if make, the spool 5 of metering valve to move expansion, and the metering oil flow of fuel-metering device is increased, then because the flow resistance of metering valve declines, before metering valve, the pressure of fuel oil 1 will reduce.Before metering valve, the reduction of fuel oil 1 pressure makes differential pressure valve spool 10 move down, and reduce circulation area and the oil return flow of oil return window 12, before metering valve, fuel oil 1 pressure rises, then spool 10 comes back to the steady state (SS) of stress balance.
In order to increase the damping of differential pressure valve spool 10, making its stable movement, in the outlet oil circuit of pressure spring 9 place oil pocket, being provided with flow nipple 8.
Metering valve is made up of spool 5, lining 2, back-moving spring 6, displacement transducer 7 etc.Spool 5 drives by the control oil in upper and lower two chambeies, and control oil from the electro-hydraulic converting element controlled by electronic controller, can move up and down vertically, its position feeds back to electronic controller by displacement transducer 7, can realize accurate position-force control.On lining 2, symmetry has even number control oil window 3, and control oily window 3 part and covered by spool 5, the position of spool 5 determines the actual circulation area controlling oily window 3.Because the pressure difference before and after metering valve is remained steady state value by differential pressure valve, therefore it is only relevant with the actual circulation area of the oily window 3 of control to measure oily flow.Spool 5 moves time control oil window 3 actual circulation area to increase, the metering oil of output increases; Otherwise metering oil reduces.When fuel-metering device quits work, spool 5 is pressed to the initial position that control oil window 3 is closed completely by back-moving spring 6.
Control oil window 3 form of metering valve has: rectangle, triangle or circle, different shapes has different discharge characteristics.Discharge characteristic is exactly the corresponding relation of the oily flow of metering and metering valve spool 5 position, and also namely measure the corresponding relation of oily flow and metering valve spool 5 value of feedback, start-up flow characteristic is exactly the low discharge part of fuel-metering device bulk flow flow characteristic.
In the fuel-metering device of Digital electronic control system, adopt rectangle control oil window, or the array configuration of several sections of rectangular windows, reason is as follows: establish certain metering valve to have employed the rectangle control oil window shown in two Fig. 2, its width is L.With the initial position of spool for true origin, this spool has length to be the idle motion of S0, and S0 is the value of feedback that the oily window of control starts open position, when front opening length is S-S0.From above-mentioned A formula:
From C formula, according to rectangle control oil window, discharge characteristic is linear, see Fig. 3, very favourable to practical application, and the metering valve spool of Digital electronic control system only controls by electronic controller, can omnidistance step-less adjustment, therefore in the fuel-metering device of Digital electronic control system, usually adopt rectangle control oil window.
The slope of rectangle control oil window traffic characteristic line, is also referred to as flow gain, reflects the oily flow of metering to the sensitivity of metering valve spool displacement.Due in engineer applied, the limited precision of metering valve spool position closed-loop control, therefore need the relation of mating discharge characteristic line slope and spool position oscillating quantity.As shown in Figure 4, if spool has the ± oscillating quantity of Δ S at S point, then corresponding metering oil flow oscillating quantity ± Δ Q is:
In order to meet request for utilization, aeromotor or the metering oil flow oscillating quantity of ground combustion machine to fuel-metering device all have clear and definite accuracy requirement.In order to meet the requirements of flow accuracy, must limit the slope of discharge characteristic line.When known spool oscillating quantity ± Δ S and flow accuracy requirement ± Δ Q, the maximal value kmax of discharge characteristic line slope is determined by following formula:
Known by C formula, the slope of discharge characteristic line and pressure difference Δ P before and after metering valve and to control oily window width L relevant.Under the prerequisite that pressure difference Δ P has determined, the breadth extreme of rectangle control oil window can be determined by E formula.
Start-up flow characteristics design and method of adjustment principle analysis: due to the existence of mismachining tolerance, the discharge characteristic of different component parts for assembly of a machine fuel-metering device is inevitable variant, the object of fuel-metering device start-up flow characteristics design and adjustment is exactly by certain design and method of adjustment, multiple stage part fuel-metering device is made to have consistent start-up flow characteristic line, to meet aeromotor or ground combustion machine to the requirement of fuel-metering device interchangeability.
The start-up flow characteristics design that the present invention sets forth and method of adjustment are for employing level pressure difference fuel flow metering principle, and metering valve has the fuel-metering device of rectangle control oil window, known by C formula, its start-up flow characteristic is linear, can be determined by the slope of characteristic line and intercept.Therefore, as long as the slope of start-up flow characteristic line and intercept are convenient to regulate, multiple stage part fuel-metering device just can be made to have consistent start-up flow characteristic.
By C formula, can table 1 content:
Table 1 start-up flow characteristic line adjustment analytical table
As shown in Table 1, existing adjustment means only can ensure that the slope of start-up flow characteristic is consistent, and intercept cannot adjust.Therefore, adjustable means should be increased, make the intercept adjustable of start-up flow characteristic.
As shown in Figure 6, the present invention is provided with the adjustable bypass adjustment element of a circulation area in parallel with metering valve, by the adjustment to this bypass adjustment element circulation area, changes its flow, and then the start-up flow characteristic that adjustment fuel-metering device is total.The present invention, to the concrete structure no requirement (NR) of this bypass adjustment element, can be laminate flow controller, flow nipple or other special construction, as long as circulation area is convenient to adjust.
Because bypass adjustment element is in parallel with metering valve, before and after it, pressure difference is identical with metering valve is also steady state value, therefore the fuel flow flowing through this element is only relevant with the circulation area of himself, and total metering oil flow, being designated as Qsum, adjusting the flow sum of element for flowing through metering valve and bypass.If the fuel flow flowing through bypass adjustment element is Q0, then C formula becomes:
The fuel flow Q0 of bypass adjustment element can be adjusted by its circulation area, therefore the intercept also adjustable of start-up flow characteristic after increasing this element.
By taking level pressure difference fuel flow metering principle, metering valve employing rectangle control oil window, increasing bypass adjustment element three design measures, we just can obtain linear start-up flow characteristic, and by the slope of pressure spring pretightning force Adjustment Performance line, the intercept by bypass adjustment element circulation area Adjustment Performance line, make multiple stage part fuel-metering device have consistent start-up flow characteristic.
Claims (3)
1. fuel-metering device start-up flow characteristics design and a method of adjustment, is characterized in that: described fuel-metering device start-up flow characteristics design and method of adjustment divide following 6 steps:
1) fuel-metering device adopts level pressure difference fuel flow metering method, and metering valve wherein adopts or part adopts rectangle control oil window, makes start-up flow characteristic be linear;
2) the bypass adjustment element that a circulation area in parallel with metering valve is adjustable is set, makes the intercept adjustable of start-up flow characteristic;
3) fuel-metering device is as standard component, and its differential pressure valve pressure difference, metering valve spool initial position value of feedback, metering valve control oil window width, bypass adjustment element circulation area parameter are all in the intermediate range of design tolerance; Enroll the start-up flow characteristic of this standard component and the initial position value of feedback of metering valve, as being adjusted the standard value of product;
4) adjusting the installation site of metering valve valve core displacement sensor, making the initial position value of feedback by adjusting gauging of products valve spool identical with standard component;
5) by changing the slope of the pressure spring pretightning force adjustment start-up flow characteristic of differential pressure valve, make the slope by adjusting product start-up flow characteristic identical with standard component;
6) by changing the intercept of the circulation area adjustment start-up flow characteristic of bypass adjustment element, make the intercept by adjusting product start-up flow characteristic identical with standard component.
2. according to fuel-metering device start-up flow characteristics design according to claim 1 and method of adjustment, it is characterized in that: described metering method is the method adopting fuel-metering device metering fuel flow:
According to fluid mechanics, the flow Q flowing through a restricting element is relevant with front and back pressure difference Δ P with its circulation area A, that is:
Wherein, K is constant;
Using one to have pressure difference keeps the element of function that the pressure difference Δ P in above formula is remained steady state value, then now, the flow flowing through restricting element is only relevant with its circulation area; If the circulation area of restricting element is adjustable, we just can by regulating the metering of its circulation area realization to fuel flow; Level pressure that Here it is difference fuel flow metering principle;
Wherein, the restricting element that circulation area is adjustable is commonly referred to metering valve, the window that metering valve area is adjustable, and be called the oily window of control, change circulation area, its Shapes flow characteristic controlling oily window is relevant; The described element with pressure difference maintenance function is commonly referred to differential pressure valve, and it sets the pressure difference of hope by the pretightning force of pressure spring.
3. according to fuel-metering device start-up flow characteristics design according to claim 2 and method of adjustment, it is characterized in that: described fuel-metering device comprises metering valve and differential pressure valve, have a direct impact start-up flow characteristic and design thereof and method of adjustment, during the concrete structure of metering valve and differential pressure valve comprises, differential pressure valve is made up of spool (10), lining (11), pressure spring (9), is the pressure reduction oil return valve integrating differential pressure measurement and oil return function; Spool (10) lower end acts on fuel oil (1) pressure before metering valve, upper end acts on the pretightning force of fuel oil (4) pressure and pressure spring (9) after metering valve, and the upper symmetry of lining (11) has the oil return window (12) that fuel oil before metering valve (1) is returned low pressure oil back chamber by even number; Pressure difference before and after metering valve is determined by the pretightning force of pressure spring (9) and spool (10) area; When differential pressure valve is in steady state (SS), obtain following relation by the equilibrium equation of spool (10):
Wherein, F0: pressure spring (9) pretightning force, d: spool (10) diameter;
When pressure spring (9) rigidity is little, and when spool (10) change in displacement is less, can be similar to and think that pressure spring (9) pretightning force is constant, therefore before and after metering valve, pressure difference is steady state value; Also can be known by (B) formula, the pretightning force of adjustment pressure spring (9) can change the pressure difference before and after metering valve; During fuel-metering device steady operation, the power acted on spool (10) is balance; If certain disturbing factor destroys the dynamic balance of spool (10), spool (10) by adjustment oil return flow, will make its rebalancing automatically; To increase the oily flow of metering, it controls oily window (3) circulation area if make, the spool of metering valve (5) to move expansion, the metering oil flow of fuel-metering device is increased, then because the flow resistance of metering valve declines, before metering valve, the pressure of fuel oil (1) will reduce; Before metering valve, the reduction of fuel oil (1) pressure makes differential pressure valve spool (10) move down, reduce circulation area and the oil return flow of oil return window (12), before metering valve, fuel oil (1) pressure rises, then spool (10) comes back to the steady state (SS) of stress balance;
In order to increase the damping of differential pressure valve spool (10), making its stable movement, in the outlet oil circuit of pressure spring (9) place oil pocket, being provided with flow nipple (8);
Metering valve is made up of spool (5), lining (2), back-moving spring (6), displacement transducer (7); Spool (5) drives by the control oil in upper and lower two chambeies, control oil from the electro-hydraulic converting element controlled by electronic controller, can move up and down vertically, its position feeds back to electronic controller by displacement transducer (7), can realize accurate position-force control; The upper symmetry of lining (2) has even number control oil window (3), control oily window (3) part to be covered by spool (5), the position of spool (5) determines the actual circulation area of the oily window of control (3); Because the pressure difference before and after metering valve is remained steady state value by differential pressure valve, therefore it is only relevant with the actual circulation area of the oily window of control (3) to measure oily flow; Spool (5) moves time control oil window (3) actual circulation area to increase, the metering oil of output increases; Otherwise metering oil reduces; When fuel-metering device quits work, spool (5) is pressed to the initial position that control oil window (3) is closed completely by back-moving spring (6);
Discharge characteristic measures the corresponding relation of oily flow and metering valve spool (5) position exactly, also namely measure the corresponding relation of oily flow and metering valve spool (5) value of feedback, start-up flow characteristic is exactly the low discharge part of fuel-metering device bulk flow flow characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210436383.8A CN102980622B (en) | 2012-11-06 | 2012-11-06 | Design and adjusting method for fuel oil metering device starting flow characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210436383.8A CN102980622B (en) | 2012-11-06 | 2012-11-06 | Design and adjusting method for fuel oil metering device starting flow characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102980622A CN102980622A (en) | 2013-03-20 |
| CN102980622B true CN102980622B (en) | 2015-06-17 |
Family
ID=47854852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210436383.8A Active CN102980622B (en) | 2012-11-06 | 2012-11-06 | Design and adjusting method for fuel oil metering device starting flow characteristics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102980622B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278199B (en) * | 2013-05-13 | 2016-04-06 | 中北大学 | A kind of vehicle fuel volume read-out proving installation |
| CN103453948A (en) * | 2013-09-09 | 2013-12-18 | 中国航空动力机械研究所 | Fuel oil metering device adopting torque motor |
| CN103591990B (en) * | 2013-11-25 | 2016-06-08 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of internal combustion turbine fuel metering method based on motor-mount pump |
| CN104314696A (en) * | 2014-08-26 | 2015-01-28 | 北京动力机械研究所 | Fuel metering valve control system and fuel regulator |
| CN105157063B (en) * | 2015-09-18 | 2018-04-13 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of adjustable burner inner liner of assignment of traffic |
| CN106768129A (en) * | 2015-11-24 | 2017-05-31 | 西安航空动力控制科技有限公司 | It is a kind of that there are two kinds of metering valves of flow rule |
| CN108801380B (en) * | 2017-04-28 | 2021-05-04 | 中国航发商用航空发动机有限责任公司 | Fuel gauge oil return valve and fuel gauge |
| CN107063363A (en) * | 2017-06-12 | 2017-08-18 | 西安成立航空制造有限公司 | A kind of indirect acting type fuel-metering device and its metering method |
| CN107762637B (en) * | 2017-10-11 | 2019-06-28 | 中国航发西安动力控制科技有限公司 | A kind of adaptive pressure difference correcting device |
| CN109653878B (en) * | 2017-10-11 | 2021-07-16 | 中国航发西安动力控制科技有限公司 | Split type metering valve |
| CN108087124B (en) * | 2017-12-20 | 2019-10-25 | 中国航发长春控制科技有限公司 | A kind of indirect oil-return type differential pressure valve of negative feedback control |
| CN109506723B (en) * | 2018-11-21 | 2021-05-28 | 中国航发西安动力控制科技有限公司 | Variable-pressure-difference metering method and device |
| CN109931162B (en) * | 2018-11-22 | 2022-02-18 | 中国航发贵州红林航空动力控制科技有限公司 | Method for preventing starting flow and steady-state flow from interfering |
| CN109899161B (en) * | 2019-03-07 | 2020-12-15 | 中国科学院工程热物理研究所 | Liquid fuel metering device |
| CN111022689B (en) * | 2019-11-21 | 2022-05-17 | 中国航发西安动力控制科技有限公司 | Fuel metering mechanism capable of realizing accurate control |
| CN111022191B (en) * | 2019-11-22 | 2022-05-27 | 中国航发西安动力控制科技有限公司 | Piston device with speed response mechanism |
| CN112985530B (en) * | 2021-02-01 | 2022-04-22 | 南京航空航天大学 | Method for adjusting design parameters of fuel metering device based on characteristic equation root track |
| CN114018353B (en) * | 2021-10-22 | 2024-03-01 | 中国航发贵州红林航空动力控制科技有限公司 | High-precision fuel flow metering device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03260483A (en) * | 1989-09-29 | 1991-11-20 | Canadian Gas Assoc | Method and device for controlling flow amount of fluid |
| CN1563692A (en) * | 2004-04-02 | 2005-01-12 | 北京航空航天大学 | Fuel regulator of turbine jet |
| EP1801391A2 (en) * | 2005-12-23 | 2007-06-27 | Rolls-Royce plc | Engine fuel system health monitoring |
| CN201637454U (en) * | 2009-11-16 | 2010-11-17 | 中国南方航空工业(集团)有限公司 | Testing device of aircraft engine fuel manifold |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2911634B1 (en) * | 2007-01-19 | 2009-03-06 | Hispano Suiza Sa | DEVICE FOR FUEL INJECTION IN A TURBOMACHINE |
-
2012
- 2012-11-06 CN CN201210436383.8A patent/CN102980622B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03260483A (en) * | 1989-09-29 | 1991-11-20 | Canadian Gas Assoc | Method and device for controlling flow amount of fluid |
| CN1563692A (en) * | 2004-04-02 | 2005-01-12 | 北京航空航天大学 | Fuel regulator of turbine jet |
| EP1801391A2 (en) * | 2005-12-23 | 2007-06-27 | Rolls-Royce plc | Engine fuel system health monitoring |
| CN201637454U (en) * | 2009-11-16 | 2010-11-17 | 中国南方航空工业(集团)有限公司 | Testing device of aircraft engine fuel manifold |
Non-Patent Citations (3)
| Title |
|---|
| Extensible object model for gas turbine engine simulation;Zhiwu Xie 等;《Applied Thermal Engineering》;20011231;第21卷(第1期);111-118 * |
| 基于单片机的燃油计量单元控制系统设计;孟武胜 等;《微处理机》;20120630(第3期);61-65 * |
| 微型涡轮发动机燃油闭环控制起动方法;徐建国 等;《航空动力学报》;20120331;第27卷(第3期);701-706 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102980622A (en) | 2013-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102980622B (en) | Design and adjusting method for fuel oil metering device starting flow characteristics | |
| CN101484858B (en) | Control method and control system for a flow control valve | |
| US5641891A (en) | Method for setting and checking the flow in valves | |
| CN105247433B (en) | Volume control device with flow monitor | |
| CN102032640A (en) | Fuzzy proportion integration differentiation (PID) control method and device for industrial environment high-precision air conditioner | |
| CN109630491B (en) | Electric control compensation two-way proportional flow valve | |
| CN103499414B (en) | Dynamic calibration device for small-size pressure sensor | |
| CN109783998B (en) | Simulink modeling method for mechanical hydraulic device of aero-engine fuel regulator | |
| CN103984234A (en) | Electro hydraulic servo system self-correction fuzzy PID control method | |
| CN203906448U (en) | Hydraulic component performance testing system | |
| CN103063418B (en) | Fuel gauging element characteristics measurement mechanism | |
| CN103116367A (en) | Automatic control method and system for tail gate water level in river model | |
| CN102768049A (en) | Intelligent differential pressure type flow rate sensing device and design method of intelligent differential pressure type flow rate sensing device | |
| EP0309643B1 (en) | Actuator for influencing the flow of a gas or a fluid medium | |
| US5795998A (en) | Flow sensor and fuel control system | |
| CN104407631A (en) | Device and method for controlling oil consumption in large-span measurement range in ground-based simulation test | |
| CN104949283A (en) | Air valve adjusting method and system for controlling air volume | |
| CN104215282A (en) | Gas flow measuring device and method for measuring gas flow using same | |
| RU2555429C2 (en) | Method and device to generate signal of setting point | |
| CN107943125A (en) | A kind of automatic pressure regulation and control system of two-pressure method | |
| CN108180180B (en) | Double-hydraulic-cylinder flow compensation synchronous erecting device and control method thereof | |
| CN104595268B (en) | A kind of pilot-operated type integrated hydraulic speed regulating control valve | |
| CN109237111A (en) | A kind of pressure-regulating hydraulic system and its control method of self-balancing pressure regulator valve | |
| CN106884831A (en) | A kind of hydraulic circuit of solid-liquid engine calibrated in situ power source | |
| CN106762160A (en) | A kind of novel fuel temperature compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |