CN111022689A - Fuel metering mechanism capable of realizing accurate control - Google Patents
Fuel metering mechanism capable of realizing accurate control Download PDFInfo
- Publication number
- CN111022689A CN111022689A CN201911147054.XA CN201911147054A CN111022689A CN 111022689 A CN111022689 A CN 111022689A CN 201911147054 A CN201911147054 A CN 201911147054A CN 111022689 A CN111022689 A CN 111022689A
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve core
- oil
- fuel
- fuel metering
- 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.)
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Classifications
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- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- 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
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
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- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/316—Guiding of the slide
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0668—Sliding valves
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
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- 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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a fuel control system, in particular to a fuel metering mechanism capable of realizing accurate control. The fuel metering mechanism comprises a valve core (12), control cavities are arranged at two ends of the valve core (12), the pressure of one control cavity A is a fixed value, and the fuel metering function is realized by adjusting the pressure of the other control cavity B. The pressure source of the control cavity B is fuel oil behind the booster pump, and the overflow valve ensures that the oil pressure behind the pump is constant. The overflow valve is arranged on the shell (9), when the oil pressure behind the booster pump exceeds a limit value, the generated hydraulic pressure exceeds the spring force to push the valve to move, the valve port is opened, and the oil circuit behind the pump is communicated with the oil return circuit to reduce the oil pressure to the limit value.
Description
Technical Field
The invention relates to a fuel control system, in particular to a fuel metering mechanism capable of realizing accurate control.
Background
The existing fuel metering mechanism generally comprises a valve core, a valve sleeve, a servo control mechanism, an adjusting nail and the like, and the opening of a molding hole is changed by jointly controlling the moving direction of the valve core through the fuel oil pressure and the servo fuel oil pressure after pumping, so that the fuel flow is changed, and the fuel metering is realized.
Fig. 1 shows a fuel metering mechanism in a mature product, in which an electro-hydraulic servo valve receives a command to control the fuel pressure to both ends of a metering valve. When the fuel flow of the combustion chamber of the engine needs to be increased, the electro-hydraulic servo valve increases the flow to the left cavity of the metering valve, the valve core of the metering valve moves rightwards, the opening of the throttling window is increased, and the fuel flow is increased. On the contrary, the electro-hydraulic servo valve increases the flow rate to the right cavity of the metering valve, the valve core of the metering valve moves leftwards, the opening of the throttling window is reduced, and the fuel flow rate is reduced. The fuel before metering of the fuel metering mechanism is directly communicated with the fuel after the pump, the hydraulic pump has non-uniform instantaneous flow in the oil suction and pressing processes, flow pulsation can be generated, the flow pulsation causes pressure pulsation, the pressure pulsation can generate periodic pressure waves in a system, and the pressure waves cause the valve core to vibrate periodically, creep, generate noise and even damage. When the valve core moves from one position to another position, the valve core cannot be accurately stabilized due to the influence of pressure waves, and accurate metering of fuel is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a fuel metering mechanism capable of realizing accurate control.
In order to achieve the purpose of the invention, the technical scheme of the invention is as follows: the fuel metering mechanism comprises a valve core, control cavities are arranged at two ends of the valve core, the pressure of one control cavity A is a fixed value, and the fuel metering function is realized by adjusting the pressure of the other control cavity B.
The pressure source of the control cavity B is fuel oil behind the booster pump, and the overflow valve ensures that the oil pressure behind the pump is constant. The overflow valve is installed on the shell, when the oil pressure after the booster pump exceeds the limit value, the generated hydraulic pressure exceeds the spring force to push the valve to move, the valve port is opened, the oil circuit after the pump is communicated with the oil return circuit, and the oil pressure is reduced to the limit value.
Preferably, the booster pump rear fuel is communicated with the control cavity B through an oil way on the valve core, and a damping needle is arranged in the oil way on the valve core, so that the influence of the pressure pulsation of the pump rear fuel on the oil pressure of the control cavity can be reduced, the oil pressure of the control cavity is stable, and the position of the valve core is controlled more accurately. The valve core is provided with a hole, the damping needle is arranged in the hole, the internal space of the valve core is fully utilized, the space of the shell does not need to be occupied, the structure of the shell is greatly simplified, and the volume and the weight of the shell are reduced.
Preferably, the damping pin is a cylindrical body, a plurality of annular grooves are formed in the outer circumferential surface of the cylindrical body, and inclined holes communicated with the annular grooves are formed in the cylindrical body. Different flow groups are set according to the aperture size, and the moving speed of the valve core can be adjusted according to different flow sizes. Meanwhile, the flow matching with the pulse width modulation digital rapid electromagnetic valve can be realized, so that the valve core can be kept stable and still after being restored to a balanced state again.
Preferably, the inclined hole of the annular groove is a flow passage for fuel flowing to the control cavity after being pumped, the roughness of the inclined hole is at least 1.6, friction loss generated by the fuel flowing in the inclined hole can be reduced, namely, flow resistance can be reduced, the pressure of the control cavity is quickly established, and the dynamic response characteristic of the metering valve is improved.
Preferably, a pulse width modulation digital fast valve is installed on a control oil path of the control cavity B, and the pressure of the control cavity B is controlled by a duty ratio signal output to the pulse width modulation digital fast solenoid valve by an electronic controller.
Preferably, the pressure of the control chamber A is the sum of the pressure of the fuel after the pump and the pressure of the fuel in the return oil chamber, and the pressure is kept constant.
Preferably, the valve core is connected with an angular displacement sensor, the angular displacement sensor converts the linear displacement of the valve core movement into an angular displacement by using a rack and a gear connected with the valve core, and the angular displacement outputs an electric signal to be fed back to the electronic controller.
Drawings
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic diagram of the principles of the present invention;
fig. 3 is a schematic view of a damper pin mechanism.
The symbols in the figures are as follows: the device comprises an end cover 1, a minimum flow adjusting nail 2, a sealing ring 3a, a sealing ring 3b, a damping needle 4, a sealing ring 5, a valve sleeve 6, a sealing ring 7, an angular displacement sensor 8, a shell 9, a maximum flow adjusting nail 10, a plug screw 11, a valve core 12, a first gap 13a, a second gap 13b, an annular groove 14 and an inclined hole 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 2 is a schematic structural diagram of the present invention, which mainly comprises a valve core 12, a valve sleeve 6, a damping needle 4, an angular displacement sensor 8, a minimum flow adjusting nail 2, a maximum flow adjusting nail 10, an end cover 1 and a plug screw 11.
The damping needle 4 is arranged in the valve core 12 and is fixed by the rolling closing of the end cover 1. The left end of the damping needle 4 is communicated with the control cavity, and the right end of the damping needle is communicated with the post-pump fuel cavity. The valve core 12 is provided with a rack which is meshed with a gear on the angular displacement sensor 8. The valve housing 6 is provided with a shaped bore and is fixed within the housing 9 in a relative motion with the valve core 12. The left end of the metering valve is provided with an end cover 1, a minimum flow adjusting screw 2 is installed inside the end cover 1, and the right end of the metering valve is provided with a screw plug 11, and a maximum flow adjusting screw 10 is installed inside the screw plug 11.
The end cover 1, the valve core 12, the valve sleeve 6 and the shell 9 form a control cavity and are positioned at the left end of the valve core 12. The screw plug 11, the valve core 12, the angular displacement sensor 8 and the shell 9 form an oil return cavity which is positioned at the right end of the valve core 12. Sealing rings (3a and 3b) are arranged between the control cavity and the fuel before metering, a sealing ring 5 is arranged between the fuel before metering and the fuel after metering, and a sealing ring 7 is arranged between the fuel after metering and the oil return cavity, so that all cavities are sealed and isolated.
A first clearance 13a exists between the valve sleeve 6 and the valve core 12, and a second clearance 13b exists between the valve core 12 and the damper pin 4.
The metering valve cooperates with the pulse width modulation digital rapid electromagnetic valve, the angular displacement sensor 8 and other elements to complete the fuel metering.
The fuel before the metering valve is high-pressure oil after the product pump, and enters the left end control cavity through the damping needle 4 on the valve core 12 to form control oil. The control chamber is in communication with the pulse width modulated digital fast solenoid valve and controls the chamber oil pressure by varying the duty cycle of the pulse width modulated digital fast solenoid valve.
Under the condition that the pressure difference between the front and the back of the metering valve is not changed, the fuel flow of the metering valve is determined by the opening between the control edge on the valve core 12 and the molded hole on the valve sleeve 6. The left end of the valve core 12 is subjected to oil pressure of the control cavity, and the right end is subjected to the sum of the pressure of high-pressure oil after pumping and the pressure of low-pressure oil in the oil return cavity, and the size of the valve core is unchanged. The valve core 12 moves under the action of fuel pressure, and the opening degree of the upper hole of the valve sleeve 6 is changed, so that the fuel flow is changed, and the accurate metering of the fuel is realized. When the valve core 12 moves rightwards, the opening of the hole is increased, and the fuel flow is increased; when the valve core 12 moves leftward, the opening of the hole becomes smaller, and the fuel flow rate decreases. The upper hole of the valve sleeve 6 is a rectangular window, so that the fuel flow area and the displacement of the valve core 12 are in a linear relation. The minimum and maximum flow rates are defined by the minimum flow rate adjustment spikes 2 and the maximum flow rate adjustment spikes 10.
The valve core 12 is provided with a rack, when the valve core 12 moves, the angular displacement sensor 8 converts the linear displacement of the valve core 12 into angular displacement by utilizing the meshing relationship of the rack and the gear of the valve core 12, the angular displacement outputs an electric signal to be fed back to the electronic controller, the electronic controller controls the duty ratio of the pulse width modulation digital rapid electromagnetic valve to change the pressure of the control cavity according to the electric signal of the angular displacement sensor 8, and then the position of the valve core 12 is adjusted, so that the fuel metering is realized.
Fig. 3 is a schematic diagram of a damping needle 4, wherein 5 inclined oil way small holes 14 are designed on the damping needle 4, and the flow rate passing through the damping needle 4 is controlled by the hole diameter, so as to control the moving speed of the valve core 12. Meanwhile, the flow of different groups can be matched with the flow of the pulse width modulation digital rapid electromagnetic valve, so that the valve core 12 can be kept stable after being restored to the balance state again. The roughness of the inclined hole is 1.6 at least, so that the friction loss generated by the fuel flowing in the inclined hole 15 can be reduced, namely the flow resistance can be reduced, the pressure of the control cavity is quickly established, and the dynamic response characteristic of the metering valve is improved.
Claims (8)
1. A fuel metering mechanism capable of realizing accurate control is characterized in that: the fuel metering mechanism comprises a valve core, control cavities are arranged at two ends of the valve core, the pressure of one control cavity A is a fixed value, and the fuel metering function is realized by adjusting the pressure of the other control cavity B;
the pressure source of the control cavity B is fuel oil after the booster pump.
2. A precisely controlled fuel metering mechanism as set forth in claim 1 wherein: and the fuel oil behind the booster pump is communicated with the control cavity B through an oil way on the valve core.
3. A fuel metering mechanism capable of achieving accurate control according to claim 2, wherein: and a damping structure is arranged in an oil way on the valve core.
4. A fuel metering mechanism capable of achieving accurate control according to claim 3, wherein: the damping structure is a columnar body, a plurality of annular grooves are formed in the outer circumferential surface of the columnar body, and inclined holes communicated with the annular grooves are formed in the columnar body;
the valve core is provided with a hole, and the damping structure is arranged in the hole.
5. A precisely controlled fuel metering mechanism as set forth in claim 4 wherein: the roughness of the inclined hole is 1.6 at least.
6. A precisely controlled fuel metering mechanism as set forth in claim 1 wherein: and a control oil path of the control cavity B is provided with a pulse width modulation digital quick valve.
7. A precisely controlled fuel metering mechanism as set forth in claim 1 wherein: the pressure of the control cavity A is the sum of the pressure of the fuel oil after the pump and the pressure of the fuel oil in the oil return cavity.
8. A precisely controlled fuel metering mechanism as set forth in claim 1 wherein: and the valve core is connected with an angular displacement sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911147054.XA CN111022689B (en) | 2019-11-21 | 2019-11-21 | Fuel metering mechanism capable of realizing accurate control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911147054.XA CN111022689B (en) | 2019-11-21 | 2019-11-21 | Fuel metering mechanism capable of realizing accurate control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111022689A true CN111022689A (en) | 2020-04-17 |
| CN111022689B CN111022689B (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911147054.XA Active CN111022689B (en) | 2019-11-21 | 2019-11-21 | Fuel metering mechanism capable of realizing accurate control |
Country Status (1)
| Country | Link |
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| CN (1) | CN111022689B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765004A (en) * | 2020-05-22 | 2020-10-13 | 中国航发贵州红林航空动力控制科技有限公司 | Conversion valve mechanism of fuel pump regulator |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4440192A (en) * | 1982-09-23 | 1984-04-03 | United Technologies Corporation | Minimization of pressure drop variation in flow controllers |
| US4440191A (en) * | 1982-09-23 | 1984-04-03 | United Technologies Corporation | Flow control device |
| US4951459A (en) * | 1988-08-30 | 1990-08-28 | Allied-Signal Inc. | Methods for metering fluid and apparatus for use therewith |
| US6321527B1 (en) * | 1998-01-08 | 2001-11-27 | Hamilton Sundstrand Corporation | Bi-level fuel pressurizing system |
| US20070107435A1 (en) * | 2005-11-11 | 2007-05-17 | Bickley Daniel J | Fuel System |
| CN102980622A (en) * | 2012-11-06 | 2013-03-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Design and adjusting method for fuel oil metering device starting flow characteristics |
| 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 |
| CN109556670A (en) * | 2018-11-21 | 2019-04-02 | 中国航发西安动力控制科技有限公司 | A kind of high-precision flow metrological service |
-
2019
- 2019-11-21 CN CN201911147054.XA patent/CN111022689B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4440192A (en) * | 1982-09-23 | 1984-04-03 | United Technologies Corporation | Minimization of pressure drop variation in flow controllers |
| US4440191A (en) * | 1982-09-23 | 1984-04-03 | United Technologies Corporation | Flow control device |
| US4951459A (en) * | 1988-08-30 | 1990-08-28 | Allied-Signal Inc. | Methods for metering fluid and apparatus for use therewith |
| US6321527B1 (en) * | 1998-01-08 | 2001-11-27 | Hamilton Sundstrand Corporation | Bi-level fuel pressurizing system |
| US20070107435A1 (en) * | 2005-11-11 | 2007-05-17 | Bickley Daniel J | Fuel System |
| CN102980622A (en) * | 2012-11-06 | 2013-03-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Design and adjusting method for fuel oil metering device starting flow characteristics |
| 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 |
| CN109556670A (en) * | 2018-11-21 | 2019-04-02 | 中国航发西安动力控制科技有限公司 | A kind of high-precision flow metrological service |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765004A (en) * | 2020-05-22 | 2020-10-13 | 中国航发贵州红林航空动力控制科技有限公司 | Conversion valve mechanism of fuel pump regulator |
| CN111765004B (en) * | 2020-05-22 | 2023-01-03 | 中国航发贵州红林航空动力控制科技有限公司 | Conversion valve mechanism of fuel pump regulator |
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| Publication number | Publication date |
|---|---|
| CN111022689B (en) | 2022-05-17 |
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