A high-stability oil control valve assembly

Abstract

The present invention discloses a high-stability oil control valve assembly, comprising a valve (2) and a bushing (1), characterized in that: wherein, the valve (2) is provided with a valve oil-passing annular groove (a) at one end near the bottom, the upper end surface of the valve oil-passing annular groove (a) is a valve oil-passing surface (D), and the top of the valve (2) is provided with a conical ball head structure (c); the bottom end of the bushing (1) is provided with a throttling hole (d), the end of the bushing (1) near the bottom end is provided with an oil inlet (e), the middle part of the bushing (1) is provided with an oil control hole (f), the valve (2) and the bushing (1) are clearance-matched at the bottom end to form a valve control hydraulic chamber (g), and the bottom end surface of the valve (2) is a valve force-bearing surface (B). The valve assembly of the present invention separates the valve oil-passing surface and the force-bearing surface, thereby improving the stability of the valve assembly during operation. The throttling hole design at the bottom end of the bushing acts as a filter nozzle, further improving the fuel fluctuation.

Description

Technical Field

[0001] The invention relates to the technical field of a gas turbine fuel control system, in particular to a high-stability oil control valve component. Background Art

[0002] The oil control valve assembly is a fuel control mechanical structure commonly used in gas turbine fuel control systems. During operation, the valve assembly usually has a fixed bushing, and the movement of the valve is used to achieve technical requirements such as fuel communication and flow control. One end of the valve is subjected to liquid pressure, and the other end is balanced by a spring. During operation, the working position of the valve is in a dynamic equilibrium state, and the movement of the valve is controlled by the liquid pressure at the bottom end surface.

[0003] The main structural principles of traditional oil control valve components are as follows Figure 1 As shown, the inlet fuel Pin acts directly on the bottom end face of the valve, pushing the valve axially and controlling the outlet fuel Pout through the oil-passing surface A, which also serves as the valve's load-bearing surface. This structure generally meets product functional design requirements well. However, when the valve is in the oil-passing state, the fuel fluid pressure at the oil-passing surface fluctuates and is circumferentially uneven due to the varying fuel flow rate. This fluid pressure acts directly on the valve's load-bearing surface A, resulting in poor valve stability during operation. Due to the mechanical hydraulic characteristics, the fuel flow rate controlled by the valve also fluctuates significantly, hindering the stable control of the gas turbine's fuel flow. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-stability oil control valve assembly, change the inlet oil circuit connection mode of the valve assembly, improve the force applied to the valve during operation, and enhance the working stability of the valve assembly.

[0005] The technical solution of the present invention is: a high-stability oil-control valve assembly, comprising a valve and a bushing, wherein the valve is provided with a valve oil-passing annular groove at one end near the bottom, the upper end surface of the valve oil-passing annular groove is the valve oil-passing surface, and the top of the valve is provided with a conical ball head structure; the bottom end of the bushing is provided with a throttling hole, the end of the bushing close to the bottom end is provided with an oil inlet, the middle part of the bushing is provided with an oil control hole, the clearance between the valve and the bottom end of the bushing is matched to form a valve-controlled hydraulic cavity, and the bottom end surface of the valve is the force-bearing surface of the valve.

[0006] The above-mentioned high-stability oil control valve assembly has the valve's inlet fuel divided into two paths, one path of fuel enters the valve's oil-passing annular groove, and the other path of fuel enters the valve's control hydraulic chamber from the throttling hole. The hydraulic pressure pushes the valve to move axially to cooperate with the oil control hole of the bushing to achieve fuel control.

[0007] In the above-mentioned high-stability oil control valve assembly, the diameter of the throttling hole is 0.5-1.2 mm.

[0008] In the above-mentioned high-stability oil control valve assembly, the top end of the valve is connected to the spring via a spring seat.

[0009] In the above-mentioned high-stability oil control valve assembly, the outer circle of the bushing adopts stepped cylinders of ФM and Фm and is sealed with the housing through a sealing ring, ФM is larger than Фm, and the bushing is fixed by an end cover assembly.

[0010] The high-stability oil control valve assembly mentioned above has a pressure equalizing groove in the middle of the valve.

[0011] Beneficial effects of the present invention: The oil control valve assembly of the present invention separates the oil-passing surface and the force-bearing surface of the valve through structural design, thereby improving the mutual influence between the two. The liquid pressure in the pressure chamber of the force-bearing surface of the valve in this structure is relatively stable, thereby improving the stability of the valve assembly during operation. The throttling hole design at the bottom end of the bushing acts as a filtering nozzle, further improving the working stability of the valve, thereby effectively improving the amount of fuel fluctuation controlled by the valve assembly. At the same time, the valve conical ball head design, the valve pressure equalizing groove structure, and the large and small cylindrical seals of the bushing outer circle can effectively improve the working reliability of the valve assembly and facilitate the assembly and disassembly of the valve assembly. The valve assembly structure is easy to implement, works safely and reliably, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structural principle of the valve assembly in the prior art;

[0013] Figure 2 Schematic diagram of the valve structure of the present invention;

[0014] Figure 3 This is a schematic diagram of the bushing structure of the present invention;

[0015] Figure 4 This is a schematic structural diagram of the valve assembly of the present invention;

[0016] Figure 5 This is a schematic diagram of the assembly structure of the valve assembly of the present invention.

[0017] In the figure: 1-bushing, 2-valve, 3-spring seat, 4-spring, 5-end cover assembly, 6-housing, a-valve oil annular groove, b-pressure equalizing groove, c-conical ball head structure, d-throttling hole, e-oil inlet, f-oil control hole, g-valve control hydraulic chamber, A-oil surface, B-valve force surface, D-valve oil surface, Pin-inlet fuel, Pout-outlet fuel, P0-low-pressure oil. Implementation Method

[0018] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0019] Embodiment 1 of the present invention: A high-stability oil-control valve assembly comprises a valve 2 and a bushing 1, wherein the valve 2 is provided with a valve oil-passing annular groove a at one end near the bottom, the upper end surface of the valve oil-passing annular groove a is a valve oil-passing surface D, and the top of the valve 2 is provided with a conical ball head structure c; the bottom end of the bushing 1 is provided with a throttling hole d, the end of the bushing 1 near the bottom end is provided with an oil inlet e, the middle part of the bushing 1 is provided with an oil control hole f, the clearance between the valve 2 and the bottom end of the bushing 1 is matched to form a valve control hydraulic chamber g, and the bottom end surface of the valve 2 is the valve force surface B.

[0020] Better yet, the inlet fuel Pin of the valve 2 is divided into two paths, one path of fuel enters the valve oil-passing annular groove a, and the other path of fuel enters the valve control hydraulic chamber g from the throttling hole d. The liquid pressure pushes the valve 2 to move axially to cooperate with the oil control hole f of the bushing 1 to realize fuel control.

[0021] The throttling hole d of the bushing 1 serves as the entrance of the hydraulic chamber g controlled by the valve, and also plays the role of a filtering nozzle, which can improve the stability of the valve 2 during operation, and further improve the working stability of the valve assembly of the present invention. After testing, the aperture of the throttling hole d is 0.5-1.2mm, and the filtering effect is good, which meets the needs of most valve 2 models.

[0022] More importantly, the top of the valve 2 is connected to the spring 4 via a spring seat 3. A pressure-equalizing groove b is located in the center of the valve 2. This structure transmits spring force to the valve through the spring seat 3 and spring 4. This structure provides a self-centering function, effectively ensuring that the direction of the spring 4's force aligns with the valve, improving operational reliability. The spring chamber communicates with low-pressure oil P0, ensuring proper operation of the valve assembly.

[0023] More preferably, the outer circumference of the bushing 1 is formed of stepped cylinders of different diameters, ØM and Øm, and is sealed to the housing 6 via a sealing ring, with ØM being larger than Øm. The bushing 1 is secured by an end cap assembly 5. During assembly and disassembly of the valve assembly, each sealing ring only makes tight contact with the housing 6 once, facilitating assembly and disassembly. The end cap assembly 5 secures the bushing 1, ensuring the valve assembly functions properly and achieving an overall structural seal with the housing 6.

[0024] Working Principle: The inlet fuel Pin is divided into two paths. One path of fuel enters the valve oil annular groove a. When the oil control hole f of bushing 1 is connected, it flows through the valve oil surface D of valve 2 and out from the fuel outlet Pout. The other path of fuel enters the valve control hydraulic chamber g through the throttling hole d of bushing 1. The hydraulic pressure pushes the valve 2 axially to cooperate with the oil control hole f of bushing 1 to achieve fuel control. This structural design spatially separates the oil flow surface D and the load-bearing surface B of valve 2, minimizing the mutual influence between the two. During operation, the hydraulic pressure stability at the oil flow surface D is poor, but the hydraulic pressure at the valve control hydraulic chamber g is relatively stable. Therefore, the dynamic balance stability of valve 2 is improved during operation, and the stability of the controlled outlet fuel Pout is also improved accordingly.

[0025] Embodiment 2 of the present invention: A high-stability oil-control valve assembly comprises a valve 2 and a bushing 1, wherein the valve 2 is provided with a valve oil-passing annular groove a at one end near the bottom, the upper end surface of the valve oil-passing annular groove a is a valve oil-passing surface D, and the top of the valve 2 is provided with a conical ball head structure c; the bottom end of the bushing 1 is provided with a throttling hole d, the end of the bushing 1 near the bottom end is provided with an oil inlet e, the middle part of the bushing 1 is provided with an oil control hole f, the valve 2 and the bottom end of the bushing 1 are clearance-matched to form a valve control hydraulic chamber g, and the bottom end surface of the valve 2 is the valve force surface B.

[0026] More preferably, the fuel inlet pin of the valve 2 is divided into two paths: one path enters the valve's oil-passing annular groove a, and the other path enters the valve's control hydraulic chamber g through the throttling orifice d. Hydraulic pressure pushes the valve 2 axially to engage the oil-control orifice f of the bushing 1 to achieve fuel control. The valve assembly of the present invention divides the fuel inlet pin into two paths: one path enters the valve's oil-passing annular groove a, and the other path enters the valve's control hydraulic chamber g through the bushing's throttling orifice d. This structure spatially separates the valve 2's oil-passing surface D from its load-bearing surface B.

[0027] The throttling hole d of the bushing 1 serves as the entrance of the valve control hydraulic chamber g, and also plays the role of a filter nozzle. It can improve the stability of the valve 2 during operation, further improving the working stability of the valve assembly of the present invention. The aperture of the throttling hole d is 0.7-1.0mm.

[0028] More preferably, the top end of the valve 2 is connected to the spring 4 via a spring seat 3 .

[0029] Embodiment 3 of the present invention: A high-stability oil-control valve assembly comprises a valve 2 and a bushing 1, wherein the valve 2 is provided with a valve oil-passing annular groove a at one end near the bottom, the upper end surface of the valve oil-passing annular groove a is a valve oil-passing surface D, and the top of the valve 2 is provided with a conical ball head structure c; the bottom end of the bushing 1 is provided with a throttling hole d, the end of the bushing 1 near the bottom end is provided with an oil inlet e, the middle part of the bushing 1 is provided with an oil control hole f, the clearance between the valve 2 and the bottom end of the bushing 1 is matched to form a valve control hydraulic chamber g, and the bottom end surface of the valve 2 is the valve force surface B.

[0030] Better yet, the inlet fuel Pin of the valve 2 is divided into two paths, one path of fuel enters the valve oil-passing annular groove a, and the other path of fuel enters the valve control hydraulic chamber g from the throttling hole d. The liquid pressure pushes the valve 2 to move axially to cooperate with the oil control hole f of the bushing 1 to realize fuel control.

[0031] The throttling hole d of the bushing 1 serves as the inlet of the valve-controlled hydraulic chamber g and also acts as a filter nozzle. The aperture of the throttling hole d is 0.9 mm.

[0032] More preferably, the top end of the valve 2 is connected to the spring 4 via a spring seat 3 .

Claims

1. A high-stability oil control valve assembly, comprising a valve (2) and a bushing (1), characterized in that: The valve (2) is provided with a valve oil-passing annular groove (a) at one end near the bottom, and the upper end surface of the valve oil-passing annular groove (a) is a valve oil-passing surface (D). The top end of the valve (2) is provided with a conical ball head structure (c); the bottom end of the bushing (1) is provided with a throttling hole (d), the end of the bushing (1) near the bottom end is provided with an oil inlet (e), and the middle of the bushing (1) is provided with an oil control hole (f). The valve (2) and the bottom end of the bushing (1) are clearance-matched to form a valve control hydraulic cavity (g). The bottom end surface of the valve (2) is the valve force surface (B); the inlet fuel (Pin) of the valve (2) is divided into two paths, one path of fuel enters the valve oil-passing annular groove (a), and the other path of fuel enters the valve control hydraulic chamber (g) from the throttling hole (d). The hydraulic pressure pushes the valve (2) to move axially to cooperate with the oil control hole (f) of the bushing (1) to realize fuel control; the aperture of the throttling hole (d) is 0.5-1.2 mm; and a pressure equalizing groove (b) is provided in the middle of the valve (2).

2. The high-stability oil control valve assembly according to claim 1, characterized in that: The top end of the valve (2) is connected to the spring (4) via a spring seat (3).

3. The high-stability oil control valve assembly according to claim 1, characterized in that: The outer circle of the bushing (1) is sealed and connected to the housing (6) through a sealing ring using stepped cylinders of ØM and Øm, ØM being larger than Øm, and the bushing (1) is fixed by an end cover assembly (5).

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