Integrated valve capable of outputting different saturation pressures and pressure characteristic curves

Abstract

The utility model belongs to the technical field of mechanical engineering, and discloses an integrated valve capable of outputting different pressure characteristic curves and saturation pressures, which comprises a pressure reduction module and a pressure servo module, an oil inlet of the pressure reduction module is connected with an on-board oil source, a brake port of the pressure reduction module is connected with an on-board brake system, and an oil return port of the pressure reduction module is connected with on-board return oil; the pressure reduction module reduces the on-board oil supply pressure to the working pressure level required by the pressure servo module and then sends the oil supply pressure to the pressure servo module, and the pressure servo module outputs a pressure characteristic curve and saturation pressure through a power-on signal of the receiver. Compared with a traditional pressure servo valve, the integrated valve of one type can adapt to different machine types (different oil supply pressure environments), and the requirement for customizing servo valves for different machine types is reduced. The design and production flow are simplified, and the research and development and production cost is remarkably reduced. Especially for an aviation hydraulic system, due to the universality and high adaptability of the integrated valve, the complexity of inventory management can be effectively reduced, the maintenance and replacement cost can be reduced, and the overall efficiency and reliability of the system can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical engineering and relates to an integrated valve for an aircraft brake system, in particular to an integrated valve capable of outputting different saturation pressures and pressure characteristic curves. Background Art

[0002] In aviation hydraulic systems, the pressure servo valve is a key component, widely used in aircraft braking systems. Braking system performance directly impacts aircraft safety and operational efficiency. Therefore, improving the stability and adaptability of the pressure servo valve has long been a research priority in aviation hydraulics. Traditional pressure servo valves require specific design and adjustment based on varying oil supply pressures, increasing R&D and production costs. Furthermore, significant variations in oil supply pressures between aircraft can lead to unstable servo valve operation, resulting in vibration and whistling, impacting system performance.

[0003] In aircraft braking systems, pressure servo valves primarily regulate and control brake pressure, ensuring safe braking under various operating conditions. Especially during parking braking, the pressure servo valve must provide a stable saturation pressure. Excessive saturation pressure can significantly wear the brake discs over time, reducing the lifespan and performance of the brake system. Therefore, regulating and controlling appropriate brake pressure is crucial for extending brake system life and improving braking performance.

[0004] During the operation of a pressure servo valve, high-frequency oscillations in the pre-stage are the primary cause of whistling. This whistling not only produces significant noise pollution but can also damage the spring tube in the pressure servo module, ultimately rendering the pressure servo valve inoperable. It also affects system stability and shortens the service life of the pressure servo valve. Utility Model Content

[0005] To address the aforementioned issues, the present invention provides an integrated valve capable of outputting different saturation pressures and pressure characteristic curves. The hydraulic oil onboard the machine enters the integrated valve's pressure-reducing module through the oil inlet. An opening is defined between the valve and the housing of the pressure-reducing module. Hydraulic oil flows through this opening, reducing pressure and generating a pressure differential across the valve's two ends. This pressure differential is equal to the compressive force generated by the pressure-regulating spring. When the inlet pressure changes, the pressure differential shifts, and the pressure-regulating spring's compression adjusts accordingly to achieve equilibrium. This movement of the pressure-regulating spring alters the opening between the valve and the valve seat, producing an opposite pressure change to the pressure-reducing operating pressure, thereby maintaining a stable pressure.

[0006] The compression amount of the regulating spring is controlled by adjusting the pressure regulating screw, so that the pressure reducing module outputs different pressure reducing working pressures.

[0007] Different decompression working pressures are also the oil inlet pressures of the rear-end pressure servo module. Different oil inlet pressures can make the pressure servo module output different saturation pressures and pressure characteristic curves.

[0008] The oil inlet and brake port of the integrated valve are equipped with oil filters to prevent impurities in the brake system oil from entering the integrated valve and contaminating the integrated valve, thereby affecting the performance of the integrated valve.

[0009] The technical solution of the present utility model is as follows: In order to achieve the purpose of the above-mentioned utility model, an integrated valve that can output different pressure characteristic curves and saturation pressures is designed, including a pressure reducing module and a pressure servo module. The oil inlet of the pressure reducing module is connected to the on-board oil source, the brake port is connected to the on-board brake system, and the oil return port is connected to the on-board return oil; the pressure reducing module reduces the on-board oil supply pressure to the working pressure level required by the pressure servo module and then sends it to the pressure servo module. The pressure servo module receives the on-board electrical signal to output the pressure characteristic curve and saturation pressure.

[0010] Furthermore, the pressure reducing module is composed of a housing, a pressure regulating screw, a pressure regulating spring, a valve, and a valve seat.

[0011] The shell has an installation cavity for installing a pressure-adjusting screw, a pressure-adjusting spring, a valve, and a valve seat. The pressure-adjusting screw is arranged at one end of the installation cavity, and the pressure-adjusting spring is mounted on the valve seat rod section. One end of the pressure-adjusting spring is against the end face of the pressure-adjusting screw, and the other end is against the root of the valve seat. There is an adjustment opening between the valve and the valve seat, and the other end of the installation cavity is sealed by a plug. The oil of the brake system enters the pressure reducing module through the oil inlet, flows through the adjustment opening and is reduced in pressure, and the decompressed oil enters the pressure servo module.

[0012] Furthermore, a partition is provided in the installation cavity to separate the installation cavity into a first installation cavity and a second installation cavity. A through hole is opened on the partition, and the valve passes through the through hole. The movement process of the valve controls the size of the through hole, thereby controlling the flow rate of oil from the first installation cavity to the second installation cavity.

[0013] Furthermore, a conical surface structure is provided at one end of the valve, and the conical surface cooperates with the through hole to adjust the oil flow rate of the through hole.

[0014] Furthermore, the pressure reducing module and the pressure servo module share a common housing, and a pressure servo module valve core installation cavity is further provided on the upper portion of the housing.

[0015] Furthermore, the oil supply pressure and the reduced pressure generate a pressure difference at both end surfaces of the valve, and the pressure difference is equal to the pressing force generated by the pressure regulating spring.

[0016] Furthermore, the valve core in the pressure servo module is designed to be thickened, and the force-bearing area at both ends of the valve core is increased, so that the pressure on the valve core is increased and the valve core is not easily stuck.

[0017] The working principle of this utility model is as follows: When the oil supply pressure on the aircraft increases, the decompression working pressure will also increase, pushing the valve seat to the left. At the same time, the valve also moves to the left under the action of the pressure difference, and the opening between the valve and the valve seat becomes smaller, and the decompression working pressure decreases until it is equal to the pressing force of the pressure regulating spring. Thus, the decompression working pressure remains stable.

[0018] When the onboard fuel supply pressure drops, the reduced pressure also decreases. At this point, the pressure-regulating spring's compressive force becomes greater than the pressure differential across the valve, causing the valve to move rightward. The opening between the valve and its seat widens, and the reduced pressure increases until it equals the pressure-regulating spring's compressive force. This keeps the reduced pressure stable. This feature of the pressure-regulating module filters out fluctuations in the onboard fuel supply pressure, consistently inputting a set reduced pressure to the downstream pressure servo module.

[0019] The pressure reducing module reduces the high oil supply pressure to a pressure level suitable for the operation of the pressure servo valve, reduces the oscillation of the servo valve, and reduces the probability of howling.

[0020] During use, the pressure reducing working pressure can be flexibly adjusted by adjusting the screw of the pressure reducing valve, thereby outputting different saturation pressures and pressure characteristic curves to meet different working requirements.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. By integrating a pressure reducing valve module, this integrated valve can reduce high oil supply pressure to the required operating pressure, thereby adapting to different oil supply environments without changing the valve body design. This eliminates the need to design a specific servo valve for each oil supply pressure environment, significantly reducing design and testing time and costs.

[0023] 2. The integrated valve can filter the fluctuation of the oil source on the machine and output a stable reduced pressure working pressure, ensuring that the brake system can work normally under various oil supply pressure environments, thereby improving the reliability and safety of the system;

[0024] 3. The integrated valve can flexibly adjust the pressure reduction operating pressure by adjusting the adjustment screw of the pressure reduction module, thereby outputting different saturation pressures and pressure characteristic curves to meet different operating requirements. For example, in an aircraft braking system, the parking brake requires a lower saturation pressure to prevent brake disc wear caused by prolonged use. This utility model can output the appropriate saturation pressure according to specific needs, extending the service life of the brake system and improving braking performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of an integrated valve. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0027] See attached Figure 1 A specifically designed integrated valve capable of outputting different pressure characteristic curves and saturation pressures is disclosed. The integrated valve comprises a pressure reducing module and a pressure servo module. The pressure servo module mainly comprises a housing 8, a valve core 1, etc. The pressure reducing module mainly comprises a pressure regulating screw 2, a pressure regulating spring 3, two oil filters (4, 5), a valve 6, a valve seat 7, a housing 8, etc. The oil inlet of the pressure reducing module is connected to the onboard oil source, a second oil filter 5 is arranged at the oil inlet, the brake port is connected to the onboard brake system, and the oil return port is connected to the onboard oil return, a second oil filter 4 is arranged at the oil return port. The pressure reducing module reduces the high-pressure oil source on the onboard to a pressure reducing working pressure suitable for the pressure servo module to operate, and the pressure reducing working pressure does not fluctuate with fluctuations in the oil supply pressure. The adjusting screw in the pressure reducing module adjusts different pressure reducing working pressures by adjusting the compression force of the pressure regulating spring. The pressure servo module at the rear end receives different pressure reducing working pressures and thus outputs different pressure characteristic curves and saturation pressures. Compared with traditional pressure servo valves, this integrated valve can adapt to different oil supply pressure environments of different models, reducing the need to customize servo valves for different models. This not only simplifies the design and production process, but also significantly reduces R&D and production costs. Particularly for aviation hydraulic systems, the versatility and high adaptability of this integrated valve can effectively reduce the complexity of inventory management, lower maintenance and replacement costs, and improve the overall efficiency and reliability of the system.

[0028] In the specifically designed structure, the pressure reducing module consists of a shell 8, a pressure regulating screw 2, a pressure regulating spring 3, a valve 6, and a valve seat 7. An installation cavity is opened on the shell 8, and the installation cavity is used to install the pressure regulating screw 2, the pressure regulating spring 3, the valve 6, and the valve seat 7. The pressure regulating screw 2 is arranged at one end of the installation cavity, and the pressure regulating spring 3 is mounted on the rod section of the valve seat 7. One end of the pressure regulating spring 3 is against the end face of the pressure regulating screw 2, and the other end is against the root of the valve seat 7. There is an adjustment opening between the valve 6 and the valve seat 7, and the other end of the installation cavity is sealed by a plug; the oil of the brake system enters the pressure reducing module through the oil inlet, flows through the adjustment opening and is reduced in pressure, and the decompressed oil enters the pressure servo module.

[0029] A partition is provided within the mounting cavity, dividing it into a first and second mounting chambers. A through-hole is formed in the partition, through which a valve 6 passes. The movement of the valve controls the size of the through-hole, thereby controlling the flow of oil from the first mounting chamber to the second mounting chamber. A conical surface is provided at one end of the valve 6, which cooperates with the through-hole to regulate the oil flow through the through-hole.

[0030] To enhance the compactness of the integrated structure, the pressure reducing module and the pressure servo module share a housing 8, the upper portion of which also houses a cavity for the pressure servo module's valve core 1. The valve core 1 in the pressure servo module is thickened, increasing the stress-bearing area at both ends of the valve core, thereby increasing the pressure applied to the valve core and preventing it from becoming stuck.

[0031] Example 1

[0032] In the braking system of a certain type of aircraft, the oil supply pressure is relatively high (28MPa). The traditional pressure servo valve is designed for a 21MPa oil supply environment and cannot withstand a high-pressure environment for a long time. Moreover, the pressure servo valve is prone to oscillation and howling in a high-pressure environment, affecting the stability of the system. High oil supply environments are particularly common in high-performance aircraft because high-pressure oil supply can provide faster response speeds and stronger hydraulic pressure. By using the integrated valve of the utility model, the high oil supply pressure is first reduced to a pressure level suitable for the operation of the pressure servo module through the pressure reducing valve module, so that the pressure servo module can work normally. There is no need for specific design and adjustment for each environment, which significantly reduces R&D and production costs.

[0033] When high-pressure oil enters the pressure-reducing module, it is reduced to a moderate operating pressure through the module's pressure-reducing action. This process is precisely controlled through an internal feedback mechanism to ensure stable output pressure. This allows the pressure-reducing module to adjust the supply pressure to within a safe operating range for the pressure servo module, even at high pressure. The pressure-reducing module's internal feedback mechanism also filters out pressure fluctuations in the aircraft's oil source, consistently providing a stable pressure-reducing operating pressure to the rear-end pressure servo module. This stable pressure-reducing operating pressure enables the rear-end pressure servo module to output a stable brake pressure. In an aircraft's braking system, this stable pressure is crucial for ensuring braking performance. Specifically, when the aircraft needs to slow down or stop, the integrated valve outputs brake pressure based on the electrical signal input by the pilot, ensuring minimal fluctuations in the contact pressure between the brake disc and brake pad, thereby achieving smooth deceleration or stopping.

[0034] The decompressed oil enters the pressure servo module, which receives an electrical signal from the machine and outputs a pressure characteristic curve (brake pressure increases as current increases). When the valve core of the pressure servo module moves to the far right, the opening between the valve core and the housing is fully open, and the pressure servo module outputs saturation pressure.

[0035] This innovative integrated valve design, proposed in this utility model, achieves versatility and adaptability by integrating a pressure-reducing valve module into the servo valve. By integrating the pressure-reducing valve module, the integrated valve of this utility model can effectively reduce the active oil supply pressure on the machine, reduce pre-stage oscillation, and avoid the occurrence of whistling. This not only improves the stability of the servo valve but also extends its service life. At the same time, by adjusting the adjustment screw of the pressure-reducing module, the oil supply pressure of the pressure servo module can be flexibly adjusted, thereby outputting different saturation pressures and pressure characteristic curves to meet different working requirements.

[0036] The versatility and adaptability of this integrated valve make it widely applicable across a wide range of aircraft types. While traditional pressure servo valves require specific designs based on the oil supply pressure of each aircraft, this new design, by integrating a pressure reducing valve module, enables a single integrated valve to adapt to the needs of different aircraft types. This not only simplifies the design and production process but also significantly reduces R&D and production costs. Particularly for aviation hydraulic systems, the versatility and high adaptability of this integrated valve can effectively reduce the complexity of inventory management, lower maintenance and replacement costs, and improve the overall efficiency and reliability of the system.

[0037] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the embodiments described herein. Improvements and modifications made by those skilled in the art based on the disclosure of this invention without departing from the scope of this invention should be considered within the scope of protection of this invention.

Claims

1. An integrated valve capable of outputting different pressure characteristic curves and saturation pressures, characterized in that: It includes a pressure reducing module and a pressure servo module. The oil inlet of the pressure reducing module is connected to the on-board oil source, the brake port is connected to the on-board brake system, and the oil return port is connected to the on-board oil return. The pressure reducing module reduces the on-board oil supply pressure to the working pressure level required by the pressure servo module and then sends it to the pressure servo module. The pressure servo module receives the on-board electrical signal to output the pressure characteristic curve and saturation pressure.

2. An integrated valve capable of outputting different pressure characteristic curves and saturation pressures according to claim 1, characterized in that: The pressure reducing module consists of a housing, a pressure regulating screw, a pressure regulating spring, a valve and a valve seat. The shell has an installation cavity for installing a pressure-adjusting screw, a pressure-adjusting spring, a valve, and a valve seat. The pressure-adjusting screw is arranged at one end of the installation cavity, and the pressure-adjusting spring is mounted on the valve seat rod section. One end of the pressure-adjusting spring is against the end face of the pressure-adjusting screw, and the other end is against the root of the valve seat. There is an adjustment opening between the valve and the valve seat, and the other end of the installation cavity is sealed by a plug. The oil of the brake system enters the pressure reducing module through the oil inlet, flows through the adjustment opening and is reduced in pressure, and the decompressed oil enters the pressure servo module.

3. An integrated valve capable of outputting different pressure characteristic curves and saturation pressures according to claim 2, characterized in that: A partition is provided in the installation cavity to separate the installation cavity into a first installation cavity and a second installation cavity. A through hole is opened on the partition, and the valve passes through the through hole. The movement process of the valve controls the size of the through hole, thereby controlling the flow rate of oil from the first installation cavity to the second installation cavity.

4. An integrated valve capable of outputting different pressure characteristic curves and saturation pressures according to claim 3, characterized in that: One end of the valve is provided with a conical surface structure, and the conical surface cooperates with the through hole to adjust the oil flow rate of the through hole.

5. The integrated valve capable of outputting different pressure characteristic curves and saturation pressures according to claim 1, characterized in that: The pressure reducing module and the pressure servo module share a housing, and a pressure servo module valve core installation cavity is also provided on the upper portion of the housing.

6. An integrated valve capable of outputting different pressure characteristic curves and saturation pressures according to claim 5, characterized in that: The valve core in the pressure servo module is designed to be thickened, and the force-bearing area at both ends of the valve core is increased, which increases the pressure on the valve core and makes the valve core less likely to get stuck.

7. The integrated valve capable of outputting different pressure characteristic curves and saturation pressures according to claim 1, characterized in that: The oil supply pressure and the reduced pressure produce a pressure difference at both ends of the valve, which is equal to the compression force generated by the pressure-regulating spring.

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