Gas fuel multi-way regulating control valve for a staged combustion chamber

Abstract

The present invention provides a multi-way regulating control valve for gaseous fuel of a staged combustor. It relates to the field of improvement of gas turbine combustors and solves the problem of gas path control for a three-stage swirler or even more-stage swirlers. The control valve includes: a main fuel pipe, a pneumatic control valve, and a swirler; the main fuel pipe, the pneumatic control valve, and the fuel sleeve of the swirler are hermetically connected; the pneumatic control valve includes a valve body, a valve core, and an elastic component; the valve core is arranged inside the valve body and forms a valve body through-hole with the valve body; under the action of the elastic component, the valve core can seal part of the valve body through-hole, so that part of the gaseous fuel flow path in the valve body is closed. By mechanically controlling the gas path switching through the elastic component, the present invention can improve the reliability of the swirler operation; it has a high integration level, is convenient for assembly, can reduce the weight of the combustor, and plays an excellent control role in the fuel gas path switching of the swirler.

Description

Technical Field

[0001] The present invention relates to the field of improvements in gas turbine combustors, and particularly to a multi-way regulating control valve for gaseous fuel in a staged combustor. Background Art

[0002] As a mechanical control element for controlling the opening and closing of a gas path, a pneumatic control valve is widely used in pneumatic control systems. With the development of pneumatic valves in recent years, pneumatic valves can already provide the accuracy required for controlling and regulating gaseous fuel in a swirler.

[0003] A pneumatic sequence valve provided by Patent No. 202020318953.3 can switch the gas path according to the magnitude of the air source pressure, has high control accuracy and a wide application range, and prevents the possible gas path chaos phenomenon during gas path switching through the control of the distance between the valve ball and the valve ball hole. However, this solution can only achieve the switching between two gas paths and cannot supply gas to the two gas paths simultaneously. There is still no good solution to the gas path control problem of a three-stage swirler or even more-stage swirlers faced in engineering applications, and the structural design of a multi-branch pneumatic control valve has become an urgent problem to be solved currently.

[0004] In order to improve the reliability of a gas fuel gas turbine combustor, reduce the weight of the combustor, and improve the production efficiency of the swirler, it is necessary to optimize the fuel supply structure of the combustor, and there is an urgent need for a new control and regulation mechanism for gaseous fuel in a staged combustor. Summary of the Invention

[0005] A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description to be discussed later.

[0006] In view of this, in order to solve the above problems, the present invention provides a multi-way regulating control valve for gaseous fuel in a staged combustor to achieve multi-way regulating control of gaseous fuel in a staged combustor.

[0007] The present invention provides a gaseous fuel multi-way regulating control valve for a staged combustion chamber, comprising: a main fuel pipe 1, a pneumatic control valve 2, and a swirler 6; the main fuel pipe 1 is hermetically connected to the pneumatic control valve 2; the swirler 6 includes multiple non-interconnected fuel sleeves and multiple fuel chambers, and each layer of fuel sleeve is hermetically connected to a fuel chamber respectively; the pneumatic control valve 2 includes a valve body 2a, a valve core 2b, and an elastic member 2c; the valve core 2b is arranged inside the valve body 2a, and a valve body through-hole 2f is formed between the valve core 2b and the valve body 2a; the valve body 2a is provided with an air inlet passage 2d communicating with the valve body through-hole 2f and multiple non-interconnected gaseous fuel passages; each gaseous fuel passage is hermetically connected to a layer of pipe of the swirler 6 respectively, and the valve core 2b can seal part of the valve body through-hole 2f under the action of the elastic member 2c, so that part of the gaseous fuel flow passages in the valve body 2a are closed.

[0008] Optionally, a pressure signal hole 2e is arranged inside the valve body 2a, and a central-stage valve ball cavity 3b, a first-stage valve ball cavity 4b, and a second-stage valve ball cavity 5b are formed between the valve core 2b and the valve body 2a; the gaseous fuel flow passages inside the valve body 2a include: a central-stage fuel passage 3c, a first-stage fuel passage 4c, and a second-stage fuel passage 5c; the air inlet passage 2d communicates with the valve body through-hole 2f, the central-stage valve ball cavity 3b communicates with the central-stage fuel passage 3c, the first-stage valve ball cavity 4b communicates with the first-stage fuel passage 4c, the second-stage valve ball cavity 5b communicates with the second-stage fuel passage 5c, and the central-stage fuel passage 3c, the first-stage fuel passage 4c, and the second-stage fuel passage 5c are not interconnected; the valve core 2b includes a central-stage valve ball 3a, a first-stage valve ball 4a, and a second-stage valve ball 5a; the sizes of the central-stage valve ball cavity 3b, the first-stage valve ball cavity 4b, and the second-stage valve ball cavity 5b are all larger than the size of the valve body through-hole 2f, and the sizes of the central-stage valve ball 3a, the first-stage valve ball 4a, and the second-stage valve ball 5a can seal the valve body through-hole 2f, so that part of the gaseous fuel flow passages in the valve body 2a are closed; the fuel sleeves of the swirler 6 include: coaxially arranged non-interconnected central-stage fuel pipes 3d, first-stage fuel pipes 4d, and second-stage fuel pipes 5d, and the fuel chambers of the swirler 6 include: a central-stage fuel chamber 3e, a first-stage fuel chamber 4e, and a second-stage fuel chamber 5e, and the central-stage fuel chamber 3e, the first-stage fuel chamber 4e, and the second-stage fuel chamber 5e are respectively connected to the central-stage fuel passage 3c, the first-stage fuel passage 4c, and the second-stage fuel passage 5c through the central-stage fuel pipes 3d, the first-stage fuel pipes 4d, and the second-stage fuel pipes 5d, so as to communicate the gaseous fuel input in the main fuel pipe 1.

[0009] Optionally, the pneumatic control valve 2, the main fuel pipe 1, and the fuel sleeves of the swirler 6 are cylindrical and have the same outer diameter.

[0010] Optionally, the elastic member 2c is a spring.

[0011] Optionally, when the gaseous fuel pressure is less than the second operating pressure, the gas pressure acts on the valve core 2b jointly with the elastic force of the elastic member 2c through the pressure signal hole 2e, so that the valve core 2b does not displace or compresses the elastic member 2c downward by a distance less than the first displacement threshold. The central stage valve ball 3a is located in the central stage valve ball cavity 3b, and the first stage valve ball 4a and the second stage valve ball 5a are located in the valve body through hole 2f, sealing the first stage valve ball cavity 4b and the second stage valve ball cavity 5b. The gaseous fuel enters the central stage fuel cavity 3e of the swirler 6 through the main fuel pipe 1, the intake passage 2d, the central stage valve ball cavity 3b, the central stage fuel passage 3c, and the central stage fuel pipe 3d, supplying gaseous fuel to the central stage fuel cavity 3e of the swirler 6; when the gaseous fuel pressure is greater than or equal to the second operating pressure and less than the third operating pressure, the gas pressure acts on the valve core 2b jointly with the elastic force of the elastic member 2c through the pressure signal hole 2e, so that the valve core 2b compresses the elastic member 2c downward by a distance greater than or equal to the first displacement threshold and less than the sum of the first displacement threshold and the second displacement threshold. The central stage valve ball 3a and the second stage valve ball 5a are located in the valve body through hole 2f, sealing the central stage valve ball cavity 3b and the second stage valve ball cavity 5b. The first stage valve ball 4a enters the first stage valve ball cavity 4b. The gaseous fuel enters the first stage fuel cavity 4e of the swirler through the main fuel pipe 1, the intake passage 2d, the first stage valve ball cavity 4b, the first stage fuel passage 4c, and the first stage fuel pipe 4d, supplying fuel to the first stage fuel cavity 4e of the swirler 6; when the gaseous fuel pressure is greater than or equal to the third operating pressure, the gas pressure acts on the valve core 2b jointly with the elastic force of the elastic member 2c through the pressure signal hole 2e, so that the valve core 2b compresses the elastic member 2c downward by a distance greater than or equal to the sum of the first displacement threshold and the second displacement threshold, causing the central stage valve ball 3a to be located in the valve body through hole 2f, sealing the central stage valve ball cavity 3b. The first stage valve ball 4a and the second stage valve ball 5a are respectively located in the first stage valve ball cavity 4b and the second stage valve ball cavity 5b. Part of the gaseous fuel enters the first stage fuel cavity 4e of the swirler 6 through the main fuel pipe 1, the intake passage 2d, the first stage valve ball cavity 4b, the first stage fuel passage 4c, and the first stage fuel pipe 4d, and the other part enters the second stage fuel cavity 5e of the swirler 6 through the second stage valve ball cavity 5b, the second stage fuel passage 5c, and the second stage fuel pipe 5d, supplying fuel to the first stage fuel cavity 4e and the second stage fuel cavity 5e of the swirler 6 simultaneously.

[0012] Optionally, the joints between the main fuel pipe 1, the valve body 2, the central stage fuel pipe 3d, the first stage fuel pipe 4d, and the second stage fuel pipe 5d are connected by welding, or the main fuel pipe 1, the valve body 2, the central stage fuel pipe 3d, the first stage fuel pipe 4d, and the second stage fuel pipe 5d are formed by 3D printing, and the axis 8 of the pneumatic valve is perpendicular to the axis 9 of the swirler.

[0013] Optionally, the intake air passage 2d, the first-stage fuel passage 4c, and the second-stage fuel passage 5c in the valve body 2 are all circular ring passages or sector ring passages, and the axes of the intake air passage 2d, the first-stage fuel passage 4c, and the second-stage fuel passage 5c are all the axis 8 of the pneumatic control valve.

[0014] Optionally, the first-stage fuel passage 4c is symmetric about the yoz reference plane 7a and the xoy reference plane 7b corresponding to the reference coordinate system 7, the central-stage fuel passage 3c is symmetric about the yoz reference plane 7a corresponding to the reference coordinate system 7, and the second-stage fuel passage 5c is symmetric about the yoz reference plane 7a corresponding to the reference coordinate system 7.

[0015] Optionally, the flow rate of the gaseous fuel in the intake air passage 2d, the central-stage fuel passage 3c, the first-stage fuel passage 4c, and the second-stage fuel passage 5c does not exceed 100 m / s.

[0016] In the pneumatic control valve structure of the gaseous fuel multi-way regulating control valve of the staged combustion chamber of the present invention, three-stage gaseous fuel passages are provided in the valve body to connect the main fuel pipe with the coaxial three-stage fuel pipe connecting pipes; based on the pressure of the gaseous fuel, the pneumatic control valve mechanically controls the air path switching through an elastic component, which can improve the working reliability of the swirler and simplify the air path control structure of the swirler; it has a high integration degree and is convenient for assembly, making the swirler structure compact, thereby reducing the weight of the combustion chamber and playing an excellent control role in the fuel air path switching of the swirler.

[0017] These and other advantages of the present invention will become more obvious through the following detailed description of the best embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention can be better understood by referring to the description given below in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to denote the same or similar components. The accompanying drawings, together with the following detailed description, are included in this specification and form a part of this specification, and are further used to illustrate the preferred embodiments of the present invention and to explain the principles and advantages of the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram showing an example of the gaseous fuel multi-way regulating control valve of the staged combustion chamber of the present invention;

[0020] Figure 2 is Figure 1 a sectional view showing the gaseous fuel multi-way regulating control valve of the staged combustion chamber of the present invention;

[0021] Figure 3 is Figure 1Schematic structural diagram showing an example of the pneumatically controlled valve of the gaseous fuel multi-way regulating control valve for the staged combustion chamber of the present invention;

[0022] Figure 4 is Figure 1 Cross-sectional view showing an example of the pneumatically controlled valve of the gaseous fuel multi-way regulating control valve for the staged combustion chamber of the present invention;

[0023] Figure 5 Is a working state diagram of the pneumatically controlled valve when only the first-stage fuel chamber of the swirler supplies fuel in the present invention;

[0024] Figure 6 Is a working state diagram of the pneumatically controlled valve when only the first-stage and second-stage fuel chambers of the swirler supply fuel in the present invention.

[0025] In the drawings: 1: Main fuel pipe; 2: Pneumatically controlled valve; 2a: Valve body; 2b: Valve core; 2c: Elastic member; 2d: Intake passage; 2e: Pressure signal hole; 2f: Valve body through hole; 3a: Central stage valve ball; 3b: Central stage valve ball cavity; 3c: Central stage fuel passage; 3d: Central stage fuel pipe; 3e: Central stage fuel chamber; 4a: First-stage valve ball; 4b: First-stage valve ball cavity; 4c: First-stage fuel passage; 4d: First-stage fuel pipe; 4e: First-stage fuel chamber; 5a: Second-stage valve ball; 5b: Second-stage valve ball cavity; 5c: Second-stage fuel passage; 5d: Second-stage fuel pipe; 5e: Second-stage fuel chamber; 6: Swirler; 7: Reference coordinate system; 7a: yoz reference plane; 7b: xoy reference plane; 8: Axis of the pneumatically controlled valve; 9: Axis of the swirler.

[0026] Those skilled in the art should understand that the elements in the drawings are shown only for simplicity and clarity and are not necessarily drawn to scale. For example, the dimensions of some elements in the drawings may be enlarged relative to other elements to help improve the understanding of the embodiments of the present invention. Detailed implementation manners

[0027] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. For the sake of clarity and conciseness, not all features of the actual implementation manners are described in the specification. However, it should be understood that many implementation-specific decisions must be made during the development of any such actual embodiment in order to achieve the specific goals of the developer, for example, to comply with those system- and business-related constraints, and such constraints may vary with different implementation manners. In addition, it should also be understood that although the development work may be very complex and time-consuming, such development work is only a routine task for those skilled in the art who benefit from the present disclosure.

[0028] Here, it should also be noted that in order to avoid obscuring the present invention with unnecessary details, only the device structures closely related to the solution according to the present invention are shown in the drawings, while other details less relevant to the present invention are omitted.

[0029] As Figure 1 and Figure 2 shown, an embodiment of the present invention provides a multi-way regulating control valve for gaseous fuel in a staged combustion chamber, including: a main fuel pipe 1, a pneumatic control valve 2, and a swirler 6; the main fuel pipe 1 is hermetically connected to the pneumatic control valve 2; the swirler 6 includes multiple non-interconnected fuel sleeves and multiple fuel chambers, and each layer of fuel sleeve is hermetically connected to a fuel chamber respectively; the pneumatic control valve 2 includes a valve body 2a, a valve core 2b, and an elastic member 2c; the valve core 2b is arranged inside the valve body 2a, and a valve body through-hole 2f is formed between the valve core 2b and the valve body 2a; the valve body 2a is provided with an intake passage 2d communicating with the valve body through-hole 2f and multiple non-interconnected gaseous fuel passages; each gaseous fuel passage is hermetically connected to a layer of pipeline of the swirler 6, and the valve core 2b can seal part of the valve body through-hole 2f under the action of the elastic member 2c, so that part of the gaseous fuel flow channels in the valve body 2a are closed.

[0030] As Figure 2As shown in the figure, in the embodiment of the present invention, a pressure signal hole 2e is provided in the valve body 2a, and between the valve core 2b and the valve body 2a, there are formed: a central-stage valve ball cavity 3b, a first-stage valve ball cavity 4b, and a second-stage valve ball cavity 5b; the gaseous fuel flow channels in the valve body 2a include: a central-stage fuel channel 3c, a first-stage fuel channel 4c, and a second-stage fuel channel 5c; the intake channel 2d is communicated with the valve body through-hole 2f, the central-stage valve ball cavity 3b is communicated with the central-stage fuel channel 3c, the first-stage valve ball cavity 4b is communicated with the first-stage fuel channel 4c, the second-stage valve ball cavity 5b is communicated with the second-stage fuel channel 5c, and the central-stage fuel channel 3c, the first-stage fuel channel 4c, and the second-stage fuel channel 5c are not communicated with each other; the valve core 2b includes a central-stage valve ball 3a, a first-stage valve ball 4a, and a second-stage valve ball 5a; the sizes of the central-stage valve ball cavity 3b, the first-stage valve ball cavity 4b, and the second-stage valve ball cavity 5b are all larger than the size of the valve body through-hole 2f, and the sizes of the central-stage valve ball 3a, the first-stage valve ball 4a, and the second-stage valve ball 5a can seal the valve body through-hole 2f, so that part of the gaseous fuel flow channels in the valve body 2a are closed; the fuel sleeves of the swirler 6 include: a central-stage fuel pipe 3d, a first-stage fuel pipe 4d, and a second-stage fuel pipe 5d that are coaxially arranged and do not communicate with each other, and the fuel cavities of the swirler 6 include: a central-stage fuel cavity 3e, a first-stage fuel cavity 4e, and a second-stage fuel cavity 5e. The central-stage fuel cavity 3e, the first-stage fuel cavity 4e, and the second-stage fuel cavity 5e are respectively connected to the central-stage fuel channel 3c, the first-stage fuel channel 4c, and the second-stage fuel channel 5c through the central-stage fuel pipe 3d, the first-stage fuel pipe 4d, and the second-stage fuel pipe 5d, and then communicate with the gaseous fuel input in the main fuel pipe 1.

[0031] In the embodiment of the present invention, the pneumatic control valve 2, the main fuel pipe 1, and the fuel sleeves of the swirler 6 are cylindrical and have the same outer diameter.

[0032] In the embodiment of the present invention, the elastic member 2c is a spring.

[0033] As Figure 4 、 Figure 5 and Figure 6 shown, in the embodiment of the present invention, the multi-way regulating control valve for gaseous fuel in the staged combustion chamber has a total of three working states based on the magnitude of the gaseous fuel pressure: only the central-stage fuel cavity 3e of the swirler supplies fuel, only the first-stage fuel cavity 4e of the swirler supplies fuel, and only the first-stage fuel cavity 4e and the second-stage fuel cavity 5e of the swirler supply fuel simultaneously; specifically:

[0034] Set the pressure when the gaseous fuel pressure just overcomes the resistance existing between the valve body 2a and the valve core 2b as the first working pressure. When the gaseous fuel pressure is less than or equal to the first working pressure, the valve core 2b is always located at the initial position. At this time, the central-stage valve ball cavity 3b is opened, and at this time, the elastic member 2c does not deform. When the valve core 2b is always located at the initial position, the corresponding pneumatic control valve 2 supplies gaseous fuel to the central-stage fuel cavity 3e of the swirler 6.

[0035] When the gaseous fuel pressure is greater than the first working pressure and less than the second working pressure, only the central-stage fuel cavity 3e of the swirler supplies fuel. The gas pressure acts on the valve core 2b together with the elastic force of the elastic member 2c through the pressure signal hole 2e, so that the valve core 2b compresses the elastic member 2c downward by a distance less than the first displacement threshold. The central-stage valve ball 3a is located in the central-stage valve ball cavity 3b, and the first-stage valve ball 4a and the second-stage valve ball 5a are located in the valve body through-hole 2f, sealing the first-stage valve ball cavity 4b and the second-stage valve ball cavity 5b. The gaseous fuel passes through the main fuel pipe 1, the intake passage 2d, the central-stage valve ball cavity 3b, the central-stage fuel passage 3c, and the central-stage fuel pipe 3d to enter the central-stage fuel cavity 3e of the swirler 6, supplying gaseous fuel to the central-stage fuel cavity 3e of the swirler 6.

[0036] When the gaseous fuel pressure is equal to the second working pressure, the central-stage valve ball cavity 3b and the second-stage valve ball cavity 5b are sealed. The first-stage valve ball 4a is located in the first-stage valve ball cavity 4b, and at this time, the distance between the upper edge of the first-stage valve ball 4a and the valve body through-hole 2f is the axial width of the first-stage valve ball 4a in the axial direction of the pneumatic control valve axis 8. The second working pressure corresponds to the situation where the pneumatic control valve 2 only supplies fuel to the first-stage fuel cavity 4e of the swirler 6. The distance of the displacement of the valve core 2b during the process of the gas pressure increasing from the first working pressure to the second working pressure is called the first displacement threshold.

[0037] When the gaseous fuel pressure is greater than the second working pressure and less than the third working pressure, the first-stage fuel cavity 4e of the swirler provides fuel. The gas pressure acts on the valve core 2b together with the elastic force of the elastic member 2c through the pressure signal hole 2e, so that the valve core 2b compresses the elastic member 2c downward by a distance that moves less than the second displacement threshold on the basis of the first displacement threshold (that is, the distance that the valve core 2b compresses the elastic member 2c downward is greater than the first displacement threshold and less than the sum of the first displacement threshold and the second displacement threshold). The central-stage valve ball 3a and the second-stage valve ball 5a are located in the valve body through-hole 2f, sealing the central-stage valve ball cavity 3b and the second-stage valve ball cavity 5b. The first-stage valve ball 4a enters the first-stage valve ball cavity 4b. The gaseous fuel passes through the main fuel pipe 1, the intake passage 2d, the first-stage valve ball cavity 4b, the first-stage fuel passage 4c, and the first-stage fuel pipe 4d to enter the first-stage fuel cavity 4e of the swirler, providing fuel to the first-stage fuel cavity 4e of the swirler 6.

[0038] When the gaseous fuel pressure is equal to the third working pressure, the central-stage valve ball cavity 3b is sealed, the first-stage valve ball 4a is located within the first-stage valve ball cavity 4b; the second-stage valve ball 5a is located within the second-stage valve ball cavity 5b, and at this time, the distance between the upper edge of the second-stage valve ball 5a and the valve body through-hole 2f is the axial width of the second-stage valve ball 5a along the axis 8 of the pneumatically controlled valve. The third working pressure corresponds to the situation where the pneumatically controlled valve 2 supplies fuel to both the first-stage fuel cavity 4e and the second-stage fuel cavity 5e of the swirler 6 simultaneously. The distance of the displacement of the valve core 2b during the process of the gas pressure increasing from the second working pressure to the third working pressure is called the second displacement threshold.

[0039] When the gaseous fuel pressure is greater than the third working pressure, the first-stage fuel cavity 4e and the second-stage fuel cavity 5e of the swirler are supplied with fuel simultaneously. The gas pressure acts on the valve core 2b together with the elastic force of the elastic component 2c through the pressure signal hole 2e, causing the valve core 2b to compress the elastic component 2c downward by a distance greater than the sum of the first displacement threshold and the second displacement threshold, so that the central-stage valve ball 3a is located within the valve body through-hole 2f to seal the central-stage valve ball cavity 3b. The first-stage valve ball 4a and the second-stage valve ball 5a are respectively located within the first-stage valve ball cavity 4b and the second-stage valve ball cavity 5b. The gaseous fuel passes through the main fuel pipe 1 and the intake passage 2d. A part passes through the first-stage valve ball cavity 4b, the first-stage fuel passage 4c, and the first-stage fuel pipe 4d to enter the first-stage fuel cavity 4e of the swirler 6, and another part passes through the second-stage valve ball cavity 5b, the second-stage fuel passage 5c, and the second-stage fuel pipe 5d to enter the second-stage fuel cavity 5e of the swirler 6, supplying fuel to both the first-stage fuel cavity 4e and the second-stage fuel cavity 5e of the swirler 6 simultaneously.

[0040] In the embodiment of the present invention, the first displacement threshold and the second displacement threshold are defined in segments. The first displacement threshold and the second displacement threshold are two independent quantities respectively, and there is no size relationship. It is possible that the first displacement threshold is greater than the second displacement threshold, or the first displacement threshold is less than the second displacement threshold, or the first displacement threshold is equal to the second displacement threshold. In one possible implementation: the first displacement threshold may be 4 mm, and the second displacement threshold may be 3 mm.

[0041] In the embodiment of the present invention, the joints between the main fuel pipe 1, the valve body 2, the central-stage fuel pipe 3d, the first-stage fuel pipe 4d, and the second-stage fuel pipe 5d are connected by welding, or the main fuel pipe 1, the valve body 2, the central-stage fuel pipe 3d, the first-stage fuel pipe 4d, and the second-stage fuel pipe 5d are formed by 3D printing, and the axis 8 of the pneumatically controlled valve is perpendicular to the axis 9 of the swirler.

[0042] In an embodiment of the present invention, the intake passage 2d, the first-stage fuel passage 4c, and the second-stage fuel passage 5c in the valve body 2 are all circular ring passages or fan-shaped ring passages, and the axes of the intake passage 2d, the first-stage fuel passage 4c, and the second-stage fuel passage 5c are all the axis of the pneumatic control valve 8.

[0043] As Figure 3 shown, in an embodiment of the present invention, the first-stage fuel passage 4c is symmetric about the yoz reference plane 7a and the xoy reference plane 7b corresponding to the reference coordinate system 7 of the pneumatic control valve, the central-stage fuel passage 3c is symmetric about the yoz reference plane 7a corresponding to the reference coordinate system 7, and the second-stage fuel passage 5c is symmetric about the yoz reference plane 7a corresponding to the reference coordinate system 7.

[0044] In an embodiment of the present invention, the flow rate of the gaseous fuel in the intake passage 2d, the central-stage fuel passage 3c, the first-stage fuel passage 4c, and the second-stage fuel passage 5c does not exceed 100 m / s.

[0045] In an embodiment of the present invention, the flow rate of the gaseous fuel in the intake passage 2d, the central-stage fuel passage 3c, the first-stage fuel passage 4c, and the second-stage fuel passage 5c does not exceed 100 m / s, meeting the requirements for the flow rate of gaseous fuel during transportation in the fuel pipe in actual engineering.

[0046] It should be understood that the orientation or positional relationship indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In this application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these modifications and variations.

[0050] Although the present invention has been described based on a limited number of embodiments, those skilled in the art in this technical field will understand, based on the above description, that other embodiments can be envisioned within the scope of the present invention thus described. In addition, it should be noted that the language used in this specification is mainly selected for readability and teaching purposes, rather than for the purpose of explaining or limiting the subject matter of the present invention. Therefore, many modifications and changes are obvious to those of ordinary skill in this technical field without departing from the scope and spirit of the appended claims. For the scope of the present invention, the disclosure of the present invention is illustrative rather than restrictive, and the scope of the present invention is defined by the appended claims.

Claims

1. A gaseous fuel multi-way regulating control valve for a staged combustion chamber, characterized in that, it includes: a main fuel pipe (1), a pneumatically controlled valve (2) and a swirler (6); the main fuel pipe (1) is hermetically connected to the pneumatically controlled valve (2); the swirler (6) includes multiple non-interconnected fuel sleeves and multiple fuel chambers, and each layer of fuel sleeve is hermetically connected to a fuel chamber respectively; the pneumatically controlled valve (2) includes a valve body (2a), a valve core (2b) and an elastic member (2c); the valve core (2b) is arranged inside the valve body (2a), and a valve body through-hole (2f) is formed between the valve core (2b) and the valve body (2a); the valve body (2a) is provided with an air inlet passage (2d) communicating with the valve body through-hole (2f) and multiple non-interconnected gaseous fuel passages; each gaseous fuel passage is hermetically connected to a layer of fuel sleeve of the swirler (6) respectively; a pressure signal hole (2e) is arranged inside the valve body (2a); a central-stage valve ball chamber (3b), a first-stage valve ball chamber (4b) and a second-stage valve ball chamber (5b) are formed between the valve core (2b) and the valve body (2a); the gaseous fuel flow passages inside the valve body (2a) include: a central-stage fuel passage (3c), a first-stage fuel passage (4c) and a second-stage fuel passage (5c); the air inlet passage (2d) communicates with the valve body through-hole (2f), the central-stage valve ball chamber (3b) communicates with the central-stage fuel passage (3c), the first-stage valve ball chamber (4b) communicates with the first-stage fuel passage (4c), the second-stage valve ball chamber (5b) communicates with the second-stage fuel passage (5c), and the central-stage fuel passage (3c), the first-stage fuel passage (4c) and the second-stage fuel passage (5c) do not communicate with each other; the valve core (2b) includes a central-stage valve ball (3a), a first-stage valve ball (4a) and a second-stage valve ball (5a); the sizes of the central-stage valve ball chamber (3b), the first-stage valve ball chamber (4b) and the second-stage valve ball chamber (5b) are all larger than the size of the valve body through-hole (2f), and the central-stage valve ball (3a), the first-stage valve ball (4a) and the second-stage valve ball (5a) can seal the valve body through-hole (2f), so that part of the gaseous fuel flow passages inside the valve body (2a) are closed; the gas pressure acts on the valve core (2b) jointly with the elastic force of the elastic member (2c) through the pressure signal hole (2e), so that the valve core (2b) can seal part of the valve body through-hole (2f), so that part of the gaseous fuel flow passages inside the valve body (2a) are closed.

2. The regulating control valve according to claim 1, characterized in that, The fuel sleeve of the cyclone (6) includes: a non-interconnected central-stage fuel pipe (3d), a first-stage fuel pipe (4d), and a second-stage fuel pipe (5d) that are coaxially arranged. The fuel chamber of the cyclone (6) includes: a central-stage fuel chamber (3e), a first-stage fuel chamber (4e), and a second-stage fuel chamber (5e). The central-stage fuel chamber (3e), the first-stage fuel chamber (4e), and the second-stage fuel chamber (5e) are respectively connected to the central-stage fuel passage (3c), the first-stage fuel passage (4c), and the second-stage fuel passage (5c) through the central-stage fuel pipe (3d), the first-stage fuel pipe (4d), and the second-stage fuel pipe (5d), and further communicate with the gaseous fuel input in the main fuel pipe (1).

3. The regulating control valve according to claim 1, characterized in that, the pneumatic control valve (2), the main fuel pipe (1), and the fuel sleeve of the cyclone (6) are all cylindrical and have the same outer diameter.

4. The regulating control valve according to claim 1, characterized in that, the elastic member (2c) is a spring.

5. The regulating control valve according to claim 2, characterized in that, when the pressure of the gaseous fuel is less than the second working pressure, the gas pressure acts on the valve core (2b) together with the elastic force of the elastic member (2c) through the pressure signal hole (2e), so that the valve core (2b) does not displace or compresses the elastic member (2c) downward by a distance less than the first displacement threshold. The central-stage valve ball (3a) is located in the central-stage valve ball cavity (3b), and the first-stage valve ball (4a) and the second-stage valve ball (5a) are located in the valve body through hole (2f), sealing the first-stage valve ball cavity (4b) and the second-stage valve ball cavity (5b). The gaseous fuel enters the central-stage fuel chamber (3e) of the cyclone (6) through the main fuel pipe (1), the intake passage (2d), the central-stage valve ball cavity (3b), the central-stage fuel passage (3c), and the central-stage fuel pipe (3d), supplying gaseous fuel to the central-stage fuel chamber (3e) of the cyclone (6); when the pressure of the gaseous fuel is greater than or equal to the second working pressure and less than the third working pressure, the gas pressure acts on the valve core (2b) together with the elastic force of the elastic member (2c) through the pressure signal hole (2e), so that the valve core (2b) compresses the elastic member (2c) downward by a distance greater than or equal to the first displacement threshold and less than the sum of the first displacement threshold and the second displacement threshold. The central-stage valve ball (3a) and the second-stage valve ball (5a) are located in the valve body through hole (2f), sealing the central-stage valve ball cavity (3b) and the second-stage valve ball cavity (5b). The first-stage valve ball (4a) enters the first-stage valve ball cavity (4b). The gaseous fuel enters the first-stage fuel chamber (4e) of the cyclone through the main fuel pipe (1), the intake passage (2d), the first-stage valve ball cavity (4b), the first-stage fuel passage (4c), and the first-stage fuel pipe (4d), supplying fuel to the first-stage fuel chamber (4e) of the cyclone (6); When the gaseous fuel pressure is greater than or equal to the third working pressure, the gas pressure acts on the valve core (2b) together with the elastic force of the elastic component (2c) through the pressure signal hole (2e), causing the valve core (2b) to compress the elastic component (2c) downward by a distance greater than or equal to the sum of the first displacement threshold and the second displacement threshold, so that the central stage valve ball (3a) is located in the valve body through hole (2f) to seal the central stage valve ball cavity (3b), and the first stage valve ball (4a) and the second stage valve ball (5a) are respectively located in the first stage valve ball cavity (4b) and the second stage valve ball cavity (5b). The gaseous fuel passes through the total fuel pipe (1) and the intake passage (2d), and a part of it enters the first stage fuel cavity (4e) of the swirler (6) through the first stage valve ball cavity (4b), the first stage fuel passage (4c), and the first stage fuel pipe (4d), and another part enters the second stage fuel cavity (5e) of the swirler (6) through the second stage valve ball cavity (5b), the second stage fuel passage (5c), and the second stage fuel pipe (5d), supplying fuel to the first stage fuel cavity (4e) and the second stage fuel cavity (5e) of the swirler (6) simultaneously.

6. The regulating control valve according to claim 2, characterized in that the joints between the total fuel pipe (1), the valve body (2), the central stage fuel pipe (3d), the first stage fuel pipe (4d), and the second stage fuel pipe (5d) are connected by welding, or the total fuel pipe (1), the valve body (2), the central stage fuel pipe (3d), the first stage fuel pipe (4d), and the second stage fuel pipe (5d) are formed by 3D printing, and the axis (8) of the pneumatic control valve is perpendicular to the axis (9) of the swirler.

7. The regulating control valve according to claim 2 or 5 or 6, characterized in that the intake passage (2d), the first stage fuel passage (4c), and the second stage fuel passage (5c) in the valve body (2) are all circular ring channels or fan-shaped ring channels, and the axes of the intake passage (2d), the first stage fuel passage (4c), and the second stage fuel passage (5c) are all the axis (8) of the pneumatic control valve.

8. The regulating control valve according to claim 7, characterized in that the first stage fuel passage (4c) is symmetric about the yoz reference plane (7a) and the xoy reference plane (7b) corresponding to the reference coordinate system (7), the central stage fuel passage (3c) is symmetric about the yoz reference plane (7a) corresponding to the reference coordinate system (7), and the second stage fuel passage (5c) is symmetric about the yoz reference plane (7a) corresponding to the reference coordinate system (7).

9. The regulating control valve according to claim 1, characterized in that the flow velocity of the gaseous fuel in the intake passage (2d), the central stage fuel passage (3c), the first stage fuel passage (4c), and the second stage fuel passage (5c) does not exceed 100 m / s.

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