Fuel distribution device

Abstract

The fuel distribution device can increase the distribution ratio control range of the precombustion stage, which comprises a precombustion stage oil path and a main combustion stage oil path, and further comprises a distribution valve arranged in the precombustion stage oil path, the distribution valve being used for distributing fuel into the precombustion stage oil path and the main combustion stage oil path, and a differential pressure control valve, two ends of the differential pressure control valve bearing the pressure difference between the inlet and outlet of the distribution valve; characterized in that, further comprising a pressure boosting valve, the pressure boosting valve being arranged in the main combustion stage oil path, one end of the pressure boosting valve bearing the oil pressure of the precombustion stage oil path inlet, and the other end bearing the preset pressure and the outlet pressure of the differential pressure control valve.

Description

TECHNICAL FIELD

[0001] The present application relates to a fuel distribution device of a combustion chamber of a gas turbine, in particular to a fuel distribution device of a staged combustion chamber of an aero-engine. BACKGROUND

[0002] Low specific fuel consumption, low pollution, low emission are the main development trend of future civil aviation engine combustion technology. The fuel distribution device controls the proportion of fuel entering the combustion chamber in different oil ways continuously and adjustably, reduces the emission of pollutants such as nitrogen oxides and carbon monoxide, and realizes low pollution combustion. In order to improve the atomization effect of the fuel nozzle, more fuel is supplied to part of the nozzles of the combustion chamber to further improve the combustion efficiency when the flow of the combustion chamber is small, and fuel is supplied to all the nozzles of the combustion chamber when the flow of the combustion chamber is large. This is a kind of staged control of fuel.

[0003] The basic structure principle of a constant differential pressure fuel distribution device is shown in Figure 1 , mainly including: a distribution valve 102, an electro-hydraulic servo valve (EHSV) 104, a linear displacement sensor (LVDT) 106, a differential pressure control valve 108, a metering fuel inlet 13, a pre-combustion stage oil way outlet 11, and a main combustion stage oil way outlet 12. The differential pressure control valve 108 realizes the constant differential pressure control of the inlet and outlet of the distribution valve 102, and ensures the control accuracy of the fuel distribution ratio of the pre-combustion stage oil way outlet 11. The EHSV and the LVDT are connected with the controller EEC signal.

[0004] The structure principle of a constant differential pressure fuel distribution device is shown in Figure 1 . The main combustion stage oil way outlet 12 does not exist the flow resistance caused by the valve, and even when the distribution valve 102 is fully opened, due to the action of the differential pressure control valve 108, the pre-combustion stage oil way still exists a flow resistance greater than that of the main combustion stage oil way, which leads to the flow of part of the fuel to the main combustion stage oil way, and limits the upper limit of the pre-combustion stage distribution ratio.

[0005] Therefore, on the one hand, the pre-combustion stage distribution ratio control range of the constant differential pressure fuel distribution device is small. SUMMARY

[0006] The purpose of the present application is to provide a fuel distribution device which can increase the pre-combustion stage distribution ratio control range.

[0007] The fuel distribution device according to the present application comprises a pre-combustion stage oil path and a main combustion stage oil path, and further comprises a distribution valve arranged in the pre-combustion stage oil path, the distribution valve being used for distributing fuel into the pre-combustion stage oil path and the main combustion stage oil path, and a pressure difference control valve, two ends of the pressure difference control valve bearing a pressure difference between an inlet and an outlet of the distribution valve; wherein the fuel distribution device further comprises a pressure boosting valve, the pressure boosting valve being arranged in the main combustion stage oil path, one end of the pressure boosting valve bearing an oil pressure of the pre-combustion stage oil path inlet, and the other end of the pressure boosting valve bearing a preset pressure and an outlet pressure of the pressure difference control valve.

[0008] In one or more embodiments, the preset pressure is provided by a spring.

[0009] In one or more embodiments, the fuel distribution device further comprises a stage valve, the main combustion stage oil path further comprises an inlet section and an outlet section arranged at a downstream side of the inlet section, the outlet section comprising a main combustion stage enriched oil path and a main combustion stage non-enriched oil path, the pressure boosting valve is arranged in the inlet section, and the stage valve is arranged in the main combustion stage enriched oil path, the stage valve receiving a position of a stage signal control valve core to change a flow resistance of the main combustion stage enriched oil path, thereby changing a fuel distribution amount between the main combustion stage enriched oil path and the main combustion stage non-enriched oil path.

[0010] In one or more embodiments, the fuel distribution device further comprises a stage valve, the main combustion stage oil path further comprises an inlet section and an outlet section arranged at a downstream side of the inlet section, the outlet section comprising a main combustion stage enriched oil path and a main combustion stage non-enriched oil path, the pressure boosting valve is arranged in the inlet section, and the stage valve is arranged in the main combustion stage non-enriched oil path, the stage valve receiving a position of a stage signal control valve core to change a flow resistance of the main combustion stage non-enriched oil path, thereby changing a fuel distribution amount between the main combustion stage enriched oil path and the main combustion stage non-enriched oil path.

[0011] In one or more embodiments, the stage signal is generated based at least in part on an operating state of an engine and a feedback signal from the stage valve.

[0012] According to the embodiments of the present application, since the pressure boosting valve is arranged in the main combustion stage oil path, a control upper limit of the pre-combustion stage distribution ratio is improved.

[0013] According to the embodiments of the present application, since the stage valve is arranged in the main combustion stage oil path, a stage control function of the constant pressure difference fuel distribution device is further realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] The above and other features, aspects and advantages of the present application will become more apparent from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0015] Figure 1 is a schematic diagram of a fuel distribution device as a comparative example.

[0016] Figure 2 is a schematic diagram of a fuel distribution device according to an embodiment.

[0017] Figure 3 is a schematic diagram of a pressure intensifier according to an embodiment.

[0018] Figure 4 is a schematic diagram of a fuel distribution device according to another embodiment. DETAILED DESCRIPTION

[0019] Reference will now be made in detail to embodiments of the application, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the application, not limitation of the application. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0020] As shown in Figure 2 , the fuel distribution device includes a distribution valve 402, a distribution valve electro-hydraulic servo valve (EHSV) 404, a distribution valve linear variable displacement transducer (LVDT) 406, and a pressure difference control valve 408, and further includes a metering fuel inlet 23, a pre-combustion stage fuel passage 21, and a main combustion stage fuel passage 22. Fuel from the metering fuel inlet 23 is divided into two passages, one of which is the pre-combustion stage fuel passage 21 and the other of which is the main combustion stage fuel passage 22.

[0021] The distribution valve 402 receives metering fuel to distribute fuel to the pre-combustion stage fuel passage 21 and the main combustion stage fuel passage 22. The distribution valve electro-hydraulic servo valve 404 controls the distribution valve 402 to distribute fuel to the main combustion stage fuel passage 22 and the pre-combustion stage fuel passage 21 in accordance with a distribution control signal that is generated based at least in part on an operating state of the engine and a feedback signal from the distribution valve, which is provided by a controller EEC. A spool of the distribution valve 402 is moved to a designated position under control of the distribution valve electro-hydraulic servo valve 404, changes a size of an opening area, changes a flow resistance of a valve flow passage, and also changes a pressure difference between an inlet of the distribution valve 402 and an outlet of the pre-combustion stage fuel passage 21. The pressure difference control valve 408 is located between the distribution valve 402 and the outlet of the pre-combustion stage fuel passage 21, and the pressure difference control valve 408 receives a pressure difference signal between the inlet of the distribution valve 402 and the outlet of the distribution valve 402 at both ends thereof, to achieve constant pressure difference control between the metering fuel inlet of the distribution valve 402 and the outlet of the pre-combustion stage fuel passage 21.

[0022] Figure 3 An example of a pressure-boosting valve is provided, which is set Figure 2 The main combustion stage fuel line 22 shown includes a movable valve core 302 and a spring 304. (See also...) Figure 2 and Figure 3 The lower control chamber of valve core 302 is connected to the outlet pressure signal of differential pressure control valve 408, and is also equipped with spring 304, with the upper end bearing the inlet pressure of main combustion stage fuel circuit 22. Main combustion stage fuel circuit 22 must overcome the pre-pressure formed by the elastic force of spring 304 and the outlet pressure of differential pressure control valve 408 to push valve core 302, allowing fuel to flow into main combustion stage fuel circuit 22. When the flow rate of pre-combustion stage fuel circuit 21 increases, the outlet pressure of differential pressure control valve 408 rises, increasing the pressure in the lower control chamber of booster valve 410, reducing the valve opening, decreasing the flow rate of main combustion stage fuel circuit 22, increasing the flow rate proportion of pre-combustion stage fuel circuit 21, and improving the pre-combustion stage fuel distribution ratio.

[0023] Figure 4 This illustrates another fuel distribution device, which includes a distribution valve 202, a distribution valve electro-hydraulic servo valve (EHSV) 204, a distribution valve linear displacement sensor (LVDT) 206, a differential pressure control valve 208, a booster valve 210, a stage valve 212, a stage valve electro-hydraulic servo valve (EHSV) 214, and a stage valve linear displacement sensor (LVDT) 216. It also includes a metering fuel inlet 33, a pre-combustion stage fuel passage 31, and a main combustion stage fuel passage. The main combustion stage fuel passage includes an inlet section and an outlet section located downstream of the inlet section, with the inlet section approximately located between points A and B. The outlet section includes a main combustion stage enriched fuel passage 321 and a main combustion stage non-rich fuel passage 322.

[0024] Metered fuel enters the fuel distribution device through the metered fuel inlet 33. A portion of the fuel passes through the distribution valve 202 and the differential pressure control valve 208, entering the pre-combustion stage fuel circuit. The electro-hydraulic servo valve 204 controls the distribution valve 202 based on the distribution control signal from the EEC (Engine Engine Control System) to distribute the fuel supplied to the main combustion stage fuel circuit and the pre-combustion stage fuel circuit. This distribution control signal is generated at least in part based on the engine's operating state and feedback signals from the distribution valve. The differential pressure control valve 208 is located between the distribution valve 202 and the pre-combustion stage nozzle fuel circuit outlet 31. The differential pressure control valve 208 receives differential pressure signals from the inlet and outlet of the distribution valve 202. Simultaneously, under the combined action of an internal spring, it achieves constant differential pressure control between the distribution valve inlet and the pre-combustion stage fuel circuit outlet 31, ensuring the control accuracy of the distribution ratio.

[0025] Another part of the fuel oil passes through the pressure intensifier valve 210, and then enters the main combustion stage enriched oil path 321 and the main combustion stage non-enriched oil path 322. The lower end control cavity of the pressure intensifier valve 210 is communicated with the pre-combustion stage oil path, and receives the pressure signal of the outlet of the pressure difference control valve 208, which is combined with the pressure signal of the outlet of the pressure difference control valve 207 to control the pressure intensifier valve 210. Figure 3 It is understood that the pressure intensifier valve 210 is also provided with a spring 304, so that the flow resistance of the main combustion stage oil path is not less than that of the pre-combustion stage oil path, thereby improving the upper limit of the pre-combustion stage distribution ratio control.

[0026] The fuel oil passing through the pressure intensifier valve 210 is partially provided to the at least partially enriched fuel nozzle through the main combustion stage enriched oil path 321, and is partially provided to the non-enriched fuel nozzle through the outlet of the main combustion stage non-enriched oil path 322. The stage valve 212 is controlled by the electro-hydraulic servo valve 214 according to the stage control signal from the EEC, which is generated based at least in part on the working state of the engine and the feedback signal from the stage valve 212, for example, the feedback signal is generated by the linear displacement transducer (LVDT) 216 detecting the displacement of the stage valve 212 to the EEC, and then the EEC controls the electro-hydraulic servo valve 214 according to the working state of the engine and the feedback signal from the stage valve 212, changes the position of the spool of the stage valve 212, adjusts the opening degree, and changes the flow resistance. The stage control between the main combustion stage enriched oil path and the main combustion stage non-enriched oil path is realized by the stage valve 212.

[0027] In another embodiment, the stage valve 212 is alternatively arranged in the main combustion stage enriched oil path 321.

[0028] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, all fall within the protection scope defined by the claims of the present application.

Claims

1. A fuel distribution device comprising a precombustion stage fuel passage and a main combustion stage fuel passage, further comprising a distribution valve provided in the precombustion stage fuel passage for distributing fuel into the precombustion stage fuel passage and the main combustion stage fuel passage, and a differential pressure control valve having both ends subjected to a differential pressure between an inlet and an outlet of the distribution valve; characterized in that, The fuel distribution device further comprises a boost valve, the boost valve is arranged in the main combustion stage oil passage, one end of the boost valve is subjected to oil pressure of the pre-combustion stage oil passage inlet, and the other end is subjected to outlet pressure of the preset pressure and differential pressure control valve; The increase of the pre-combustion stage oil passage flow rate causes the increase of the differential pressure control valve outlet pressure, the increase of the boost valve lower end control cavity pressure, the decrease of the valve opening degree, the decrease of the main combustion stage oil passage flow rate, the increase of the pre-combustion stage oil passage flow rate proportion, and the increase of the pre-combustion stage fuel distribution proportion.

2. The fuel dispensing device of claim 1, wherein, The preset pressure is provided by a spring.

3. The fuel dispensing device of claim 1, wherein, The fuel distribution device further comprises a stage valve, the main combustion stage oil passage further comprises an inlet section and an outlet section arranged on the downstream side of the inlet section, the outlet section comprises a main combustion stage rich oil passage and a main combustion stage non-rich oil passage, the boost valve is arranged in the inlet section, and the stage valve is arranged in the main combustion stage non-rich oil passage, the stage valve receives a stage signal to control the position of the valve core, so as to change the flow resistance of the main combustion stage non-rich oil passage, and further change the fuel distribution amount between the main combustion stage rich oil passage and the main combustion stage non-rich oil passage.

4. The fuel dispensing device of claim 1, wherein, The fuel distribution device further comprises a stage valve, the main combustion stage oil passage further comprises an inlet section and an outlet section arranged on the downstream side of the inlet section, the outlet section comprises a main combustion stage rich oil passage and a main combustion stage non-rich oil passage, the boost valve is arranged in the inlet section, and the stage valve is arranged in the main combustion stage rich oil passage, the stage valve receives a stage signal to control the position of the valve core, so as to change the flow resistance of the main combustion stage rich oil passage, and further change the fuel distribution amount between the main combustion stage rich oil passage and the main combustion stage non-rich oil passage.

5. A fuel dispensing device as claimed in claim 3 or 4, characterised in that, The stage signal is generated based at least in part on the working state of the engine and a feedback signal from the stage valve.

6. The fuel dispensing device of claim 5, wherein, The stage valve comprises a stage valve linear displacement sensor for detecting displacement of the valve core of the stage valve, and the stage signal comprises a signal fed back by the stage valve linear displacement sensor.

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