A multi-timing metering valve and its usage method

Abstract

The present invention discloses a multi-timing metering valve and its usage method. The present invention includes a housing, in which a metering valve is installed, and the metering valve is installed in a metering valve bushing; the right end of the metering valve is a small-diameter end, on which a spring is installed, and the left end is a large-diameter end, on which a linear displacement sensor is installed; one end of the spring abuts against the metering valve, the other end abuts against one end of a spring seat, the other end of the spring seat abuts against an end cover, and an adjusting screw is assembled in the end cover. Under the condition of meeting the timing requirements of the engine, the present invention proposes a structure of a metering valve, which can sequentially realize the safety loop detection of the control system, the connection of the afterburner pump and the normal fuel supply of the afterburner combustion chamber, effectively avoiding the problems of excessive temperature rise of the afterburner pump during loop detection and abnormal non-fuel supply of the afterburner combustion chamber, and improving the working safety of the engine.

Description

Technical Field

[0001] The present invention relates to a structure of a control actuator for an afterburning system of a military aeroengine, in particular to a multi-sequential metering valve and its usage method when realizing the connection of an afterburning pump and supplying fuel to an afterburning chamber. Background Art

[0002] The fuel control system of a military aeroengine is the core system of the engine. Among them, the work of the afterburning system control is to change the connection or disconnection of the engine afterburning according to the working state requirements of the engine. When entering the afterburning state, the system needs to realize three sequential requirements: from the connection of the afterburning pump to the supply of command oil and then to the metered fuel output. On this basis, in order to improve the safety of the engine, the control system needs to perform loop detection, and problems such as excessive temperature rise of the afterburning pump should not occur during the loop detection. In response to this requirement, a multi-sequential valve structure is proposed. Summary of the Invention

[0003] To solve the problems of excessive temperature rise of the afterburning pump and abnormal non-fuel supply to the afterburning chamber, the present invention provides a multi-sequential metering valve and its usage method.

[0004] The technical solution of the present invention: A multi-sequential metering valve includes a housing, in which a metering valve is installed, and the metering valve is installed in a metering valve bushing; the right end of the metering valve is a small-diameter end, on which a spring is installed, and the left end is a large-diameter end, on which a linear displacement sensor is installed; one end of the spring abuts against the metering valve, the other end abuts against one end of a spring seat, the other end of the spring seat abuts against an end cover, and an adjusting screw is assembled in the end cover.

[0005] In the aforementioned multi-sequential metering valve, from left to right on the housing, there are successively arranged a pre-metering oil chamber, a post-metering oil chamber, a first constant-pressure oil chamber, a command oil chamber, an oil return chamber, a second constant-pressure oil chamber, and an afterburning pump control chamber.

[0006] In the aforementioned multi-sequential metering valve, the shape of the metering valve is a stepped cylinder composed of a large-diameter section and a small-diameter section; the metering valve is successively provided with annular grooves d1, d2, d3, d4, and d5 from left to right; the annular groove d1 is used to communicate with the pre-metering fuel in the pre-metering oil chamber; the annular groove d2 is used to communicate with the command oil in the command oil chamber; the annular groove d3 is used to communicate the command oil in the command oil chamber with the oil return in the oil return chamber; the annular groove d4 is used to communicate with the afterburning pump control oil in the afterburning pump control chamber; the annular groove d5 is used to communicate the afterburning pump control oil with the oil return, and at the same time, the oil return is communicated to the system oil return chamber through an elongated hole provided on the small-diameter section.

[0007] In the aforementioned multi-timing metering valve, the shape of the metering valve bushing is formed by cross-connecting multiple cylinders of unequal sizes; the metering valve bushing is successively provided with cylinder D1, cylinder D2, cylinder D3, cylinder D4, cylinder D5, cylinder D6, and cylinder D7 from left to right; a number of holes Ⅰ are evenly distributed in the radial direction of cylinder D1 for communicating the fuel before metering; a number of holes Ⅱ are evenly distributed in the radial direction of cylinder D2 for communicating the metered fuel in the post-metering oil chamber; a number of special holes Ⅲ with small ends on both sides and a large middle are evenly distributed in the radial direction of cylinder D3 for communicating with the constant-pressure oil in constant-pressure oil chamber Ⅰ and constant-pressure oil chamber Ⅱ; a number of holes Ⅳ are evenly distributed in the radial direction of cylinder D4 for communicating the command oil; a number of holes Ⅴ are evenly distributed in the radial direction of cylinder D5 for communicating the return oil; a number of holes Ⅵ are evenly distributed in the radial direction of cylinder D6 for communicating the afterburner pump control chamber and the return oil; a number of holes Ⅶ are evenly distributed in the radial direction of cylinder D7 for communicating the constant-pressure oil and the afterburner pump control chamber to control the connection of the afterburner pump.

[0008] A threaded hole is provided at the left end of the metering valve for fixing the metering valve and the linear displacement sensor.

[0009] A usage method of a multi-timing metering valve, the multi-timing metering valve is used to realize the connection of the afterburner pump and supply oil to the afterburner combustion chamber; when the multi-timing metering valve receives a command and moves to the right, before entering the afterburner, the metering valve realizes loop detection by moving a certain distance to the right. At this time, the control oil of the afterburner pump, the command oil, and the metered fuel are not established; when it is necessary to enter the afterburner, the metering valve continues to move to the right. First, the annular groove d4 communicates the pressure from the constant-pressure oil to the afterburner pump control chamber, and the pressure in the afterburner pump control chamber is established accordingly, and the afterburner pump enters the afterburner working state; then the annular groove d5 communicates the constant-pressure oil and the command oil to realize the output of the command oil; finally, the annular groove d1 communicates the fuel before metering and the fuel after metering to realize the output of the metered fuel; when exiting the afterburner, the metering valve moves to the left, and during the moving process, the afterburner is exited in sequence.

[0010] Beneficial effects

[0011] Under the condition of meeting the timing requirements of the engine, the present invention proposes a structure of a metering valve, which can sequentially realize the safety loop detection of the control system, the connection of the afterburner pump, and the normal oil supply to the afterburner combustion chamber, effectively avoiding the problems of excessive temperature rise of the afterburner pump during loop detection and abnormal non-oil supply to the afterburner combustion chamber, and improving the working safety of the engine. Description of the drawings

[0012] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 is the assembly schematic diagram of the structure of the present invention (the arrows marked 22-27 in the figure indicate the oil direction);

[0014] Figure 2 is the structural schematic diagram of the metering valve;

[0015] Figure 3 is the structural schematic diagram of the metering valve bushing.

[0016] The reference signs in the drawings are: linear displacement sensor 1, housing 2, metering valve bushing 3, metering valve 4, spring 5, spring seat 6, end cover 7, adjusting screw 8, pre-metering oil chamber 21, post-metering oil chamber 22, first constant pressure oil chamber 23, command oil chamber 24, return oil chamber 25, second constant pressure oil chamber 26, booster pump control chamber 27. Detailed implementation manners

[0017] To enable those skilled in the art of this technology to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0018] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0019] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances.

[0020] In addition, the terms "installed", "set up", "provided with", "connected", "linked", "socketed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components or parts. 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.

[0021] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0022] Embodiment. A multi-timing metering valve. Its structure is as Figure 1 shown, including a linear displacement sensor 1, a housing 2, a metering valve bushing 3, a metering valve 4, a spring 5, a spring seat 6, an end cover 7, an adjusting screw 8, etc. The metering valve 4 is installed in the metering valve bushing 3. A spring 5 is installed at the small-diameter end of the structure of the metering valve 4, and a linear displacement sensor 1 is installed at the large-diameter end. One end of the spring 5 abuts against the metering valve 4, the other end abuts against the spring seat 6, the other end of the spring seat 6 abuts against the end cover 7, and the adjusting screw 8 is assembled in the end cover 7. The entire assembly is installed in the housing 2. The metering valve 4 must be designed according to the large and small diameter ends, and the purpose of doing so is to facilitate assembly.

[0023] The structure of the metering valve is as Figure 2 shown. The metering valve 4 is in the shape of a stepped cylinder composed of a large-diameter section and a small-diameter section. There are threaded holes with a certain size on the end face of the large-diameter section, which are convenient for fixing the metering valve to the linear displacement sensor; annular grooves d1, d2, d3, d4, d5 are opened on the large-diameter cylinder. Among them, d1 is used for the communication of fuel before metering; d2 is used for the communication of incoming command oil; d3 is used for the communication of command oil and return oil; d4 is used for the communication of control oil of the afterburner pump; d5 is used for the communication of control oil of the afterburner pump and return oil. At the same time, the return oil is communicated to the system return oil cavity through the slender holes on the small-diameter section.

[0024] The structure of the metering valve bushing is as Figure 3As shown in the figure, the metering valve bushing 3 is formed by intersecting multiple cylinders of different sizes. The cylinder D1 is evenly distributed with several holes Ⅰ in the radial direction for communicating the fuel before metering; D2 is evenly distributed with several holes Ⅱ in the radial direction for communicating the fuel after metering; D3 is evenly distributed with several special holes Ⅲ that are small at both ends and large in the middle in the radial direction for communicating the constant-pressure oil; D4 is evenly distributed with several holes Ⅳ in the radial direction for communicating the command oil; D5 is evenly distributed with several holes Ⅴ in the radial direction for communicating the return oil; D6 is evenly distributed with several holes Ⅵ in the radial direction for communicating the afterburner pump control chamber and the return oil; D7 is evenly distributed with several holes Ⅶ in the radial direction for communicating the constant-pressure oil and the afterburner pump control chamber to control the connection of the afterburner pump. The special hole Ⅲ that is small at both ends and large in the middle is calculated according to the control law of this valve. If the "special hole Ⅲ" is not designed in the form of small at both ends and large in the middle, the metering requirements of the metering valve cannot be achieved.

[0025] After calculation, the annular groove d1 of the designed metering valve is Ф12mm, the annular groove d2 is Ф15mm, the annular groove d3 is Ф15mm, the annular groove d4 is Ф15mm, and the annular groove d5 is Ф15mm. The diameter of the cylinder D1 on the metering valve bushing is Ф25mm, and it is evenly distributed with 4 waist-shaped holes I with a length of 10.5mm, a width of 6mm, and semi-circular ends with a radius of R3 in the radial direction; the diameter of the cylinder D2 is Ф26mm, and it is evenly distributed with 2 rectangular holes Ⅱ with a length of 9.5mm and a width of 1.78mm in the radial direction; the diameter of the cylinder D3 is Ф25mm, and it is evenly distributed with 4 rectangular holes Ⅲ with a length of 8mm, a width of 1mm, and fillets at four corners with a radius of R0.3 in the radial direction; the diameter of the cylinder D4 is Ф25mm, and it is evenly distributed with 4 rectangular holes Ⅳ with a length of 6mm, a width of 3.5mm, and fillets at four corners with a radius of R0.3 in the radial direction; the diameter of the cylinder D5 is Ф25mm, and it is evenly distributed with 4 rectangular holes Ⅴ with a length of 8mm, a width of 1mm, and fillets at four corners with a radius of R0.3 in the radial direction; the diameter of the cylinder D6 is Ф25mm, and it is evenly distributed with 6 holes Ⅵ with a diameter of Ф2 in the radial direction; the diameter of the cylinder D5 is Ф25mm, and it is evenly distributed with 4 rectangular holes Ⅶ with a length of 8mm, a width of 1.5mm, and fillets at four corners with a radius of R0.3 in the radial direction. The parameters provided here are optimized parameters after a large number of experiments. The valve produced according to the above parameters has the advantages of meeting the strength requirements, being lightweight, and having good assembly processability. If the aforementioned dimensional parameters are adjusted, technical problems will occur in the prepared valve.

[0026] When the metering valve receives an instruction to move to the right, before entering afterburner, the metering valve realizes loop detection by moving a specific distance. At this time, the control oil, command oil, and metering oil of the afterburner pump are not established yet. When it is necessary to enter afterburner, the metering valve continues to move to the right. First, the pressure from the constant-pressure oil is communicated to the control chamber of the afterburner pump through the annular groove d4, and the pressure in the control chamber of the afterburner pump is established accordingly, and the afterburner pump enters the afterburner working state. Then, the constant-pressure oil and the command oil are communicated through the annular groove d5 to realize the output of the command oil. Finally, the fuel before metering (pre-metering fuel) and the fuel after metering (post-metering fuel) are communicated through the annular groove d1 to realize the output of the metered fuel. When exiting afterburner, the metering valve moves to the left, and during the movement process, the afterburner is exited in sequence. The three time sequences in the positive direction are successively turning on the afterburner pump, providing command oil, and outputting metered fuel; correspondingly, exiting the afterburner in sequence is, in the reverse direction, first not outputting metered fuel, then not turning on the command oil, and finally not turning on the afterburner pump.

[0027] As described above, it is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent replacement or change, and should be covered within the protection scope of the present application.

Claims

1. A multi-timing metering valve, characterized in that: it includes a housing (2), in which a metering valve (4) is installed, and the metering valve (4) is installed within a metering valve bushing (3); the right end of the metering valve (4) is a small-diameter end, on which a spring (5) is installed, and the left end is a large-diameter end, on which a linear displacement sensor (1) is installed; one end of the spring (5) abuts against the metering valve (4), the other end abuts against one end of a spring seat (6), and the other end of the spring seat (6) abuts against an end cover (7), and an adjusting screw (8) is assembled within the end cover (7); on the housing (2) from left to right, there are successively arranged a pre-metering oil chamber (21), a post-metering oil chamber (22), a first constant-pressure oil chamber (23), a command oil chamber (24), an oil return chamber (25), a second constant-pressure oil chamber (26), and a booster pump control chamber (27); the metering valve (4) is in the shape of a stepped cylinder composed of a large-diameter section and a small-diameter section; the metering valve (4) is successively provided with an annular groove d1, an annular groove d2, an annular groove d3, an annular groove d4, and an annular groove d5 from left to right; the annular groove d1 is used to communicate with the pre-metering fuel in the pre-metering oil chamber (21); the annular groove d2 is used to communicate with the command oil in the command oil chamber (24); the annular groove d3 is used to communicate the command oil in the command oil chamber (24) with the oil return in the oil return chamber (25); the annular groove d4 is used to communicate with the booster pump control oil in the booster pump control chamber (27); the annular groove d5 is used to communicate the booster pump control oil with the oil return, and at the same time, the oil return is communicated to the system oil return chamber through an elongated hole provided on the small-diameter section; the metering valve bushing (3) is in the shape of a combination of multiple cylinders of different sizes connected crosswise; the metering valve bushing (3) is successively provided with a cylinder D1, a cylinder D2, a cylinder D3, a cylinder D4, a cylinder D5, a cylinder D6, and a cylinder D7 from left to right; the cylinder D1 is uniformly provided with a number of holes Ⅰ in the radial direction for communicating the pre-metering fuel; the cylinder D2 is uniformly provided with a number of holes Ⅱ in the radial direction for communicating the post-metering fuel in the post-metering oil chamber (22); the cylinder D3 is uniformly provided with a number of special-shaped holes Ⅲ that are small at both ends and large in the middle in the radial direction for communicating with the constant-pressure oil in the first constant-pressure oil chamber (23) and the second constant-pressure oil chamber (26); the cylinder D4 is uniformly provided with a number of holes Ⅳ in the radial direction for communicating the command oil; the cylinder D5 is uniformly provided with a number of holes Ⅴ in the radial direction for communicating the oil return; the cylinder D6 is uniformly provided with a number of holes Ⅵ in the radial direction for communicating the booster pump control chamber (27) with the oil return; the cylinder D7 is uniformly provided with a number of holes Ⅶ in the radial direction for communicating the constant-pressure oil with the booster pump control chamber (27) to control the connection of the booster pump; 2. The multi-timing metering valve according to claim 1, characterized in that: the left end of the metering valve (4) is provided with a threaded hole for fixing the metering valve (4) and the linear displacement sensor (1).

3. A method for using the multi-timing metering valve according to claim 2, characterized in that: The multi-timing metering valve is used to realize the connection of the afterburner pump and supply fuel to the afterburner combustion chamber; when the multi-timing metering valve receives an instruction to move to the right, before entering the afterburner, the metering valve (4) realizes loop detection by moving a certain distance to the right. At this time, the control oil, command oil, and metered fuel of the afterburner pump are not established yet; when it is necessary to enter the afterburner, the metering valve (4) continues to move to the right. First, the pressure from the constant-pressure oil is communicated to the control chamber (27) of the afterburner pump through the annular groove d4, and the pressure in the control chamber (27) of the afterburner pump is established accordingly, and the afterburner pump enters the afterburning working state; then the constant-pressure oil and the command oil are communicated through the annular groove d5 to realize the output of the command oil; finally, the fuel before metering and the fuel after metering are communicated through the annular groove d1 to realize the output of the metered fuel; when exiting the afterburner, the metering valve (4) moves to the left, and during the movement process, it exits the afterburner in sequence.

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