A multi-stage constant pressure variable regulation hydraulic system, flight equipment and method

Abstract

The present invention relates to the technical field of hydraulic systems, and in particular, to a multi-stage constant pressure variable regulation hydraulic system, flight equipment and method. The multi-stage constant pressure variable regulation hydraulic system includes an elastic component, a valve seat component, a valve core component, a hydraulic pump component and a control valve component. The outer wall of the valve seat component is provided with a constant pressure variable oil hole, and the interior is provided with a first channel, a first accommodating chamber, a second channel and a second accommodating chamber that are connected in sequence. The valve core component includes a first valve core unit and a second valve core unit, and the end surface area of ​​the second valve core unit away from the first valve core unit is larger than the end surface area of ​​the first valve core unit toward the second valve core unit. The control valve component controls the second accommodating chamber to switch between the oil outlet and the return oil port of the hydraulic pump, thereby changing the opening pressure of the constant pressure variable oil hole. This solves the problem that the single-stage constant pressure variable form of the pressure regulating mechanism of the conventional flight equipment engine drive pump cannot meet a variety of complex working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a multi-stage constant pressure variable regulation hydraulic system, flight equipment, and method. Background Art

[0002] Aircraft equipment typically requires an engine for takeoff, attitude adjustment, and flight attitude maintenance. For example, in aircraft, the engine-driven pump is the heart of the aircraft's hydraulic system, providing the hydraulic energy. Hydraulic actuators within the aircraft's hydraulic system, such as landing gear, control surfaces, and various doors, all rely on the engine-driven pump to provide hydraulic energy to perform their corresponding movements. However, the pressure requirements of the hydraulic system vary in different usage scenarios. For example, during aircraft maneuvers, the hydraulic pump and the hydraulic system within it must operate at high pressure and high flow to meet the demands of the aircraft's various actuators. During cruising, the hydraulic system's power requirements are low, with moderate pressure requirements. However, appropriate pressure must be maintained to maintain flight attitude and achieve low energy consumption during cruising. Furthermore, the starting load required by aircraft equipment varies depending on the region. The thin air in plateaus results in lower starting loads, while the relatively high starting loads in plains are higher.

[0003] Existing aircraft equipment engine drive pump pressure regulating mechanisms mostly adopt a single-stage constant pressure variable form, which cannot meet the complex working conditions of aircraft equipment. Therefore, it is necessary to improve the traditional constant pressure variable form of the hydraulic pump. Summary of the Invention

[0004] In order to solve the problem that the single-stage constant pressure variable form of the pressure regulating mechanism of the conventional aircraft engine drive pump cannot meet various complex working conditions, the present invention provides a multi-stage constant pressure variable regulation hydraulic system, aircraft equipment and method.

[0005] In a first aspect, the present invention provides a multi-stage constant pressure variable regulation hydraulic system, the multi-stage constant pressure variable regulation hydraulic system comprising:

[0006] An elastic component, the elastic component comprising an elastic unit, a first mounting unit, and a second mounting unit; one end of the elastic unit is detachably connected to the first mounting unit, and the other end of the elastic unit is detachably connected to the second mounting unit;

[0007] A valve seat assembly, the valve seat assembly comprising a valve sleeve unit; a constant-pressure variable oil hole is formed on an outer wall of the valve sleeve unit; a first channel, a first accommodating chamber, a second channel, and a second accommodating chamber are sequentially connected within the valve sleeve unit; the constant-pressure variable oil hole is connected to the first channel;

[0008] The valve core assembly comprises a first valve core unit and a second valve core unit; the first valve core unit is slidingly arranged in the first channel; the second valve core unit is slidingly arranged in the second channel; the end surface area of ​​the first valve core unit facing the second valve core unit is larger than the end surface area of ​​the second valve core unit facing the first valve core unit; the end surface area of ​​the second valve core unit away from the first valve core unit is larger than the end surface area of ​​the first valve core unit facing the second valve core unit; the end of the first valve core unit away from the second valve core unit is detachably connected to the second mounting unit; when the first valve core unit moves toward the elastic component, it can open the constant-pressure variable oil hole and communicate with the first accommodating chamber; when the first valve core unit moves away from the elastic component, it can block the constant-pressure variable oil hole from communicating with the first accommodating chamber;

[0009] A hydraulic pump assembly, the hydraulic pump assembly comprising a hydraulic pump; the hydraulic pump having an oil outlet and an oil return port; the oil outlet of the hydraulic pump being in communication with the first accommodating chamber; the first mounting unit being detachably connected to the hydraulic pump assembly;

[0010] A control valve assembly controls the second accommodating chamber to switch between the oil outlet and the oil return port of the hydraulic pump.

[0011] In some embodiments, the multi-stage constant pressure variable regulation hydraulic system also includes a pressure regulating assembly; the pressure regulating assembly includes a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position cavity is provided inside the pressure regulating unit; one end of the first mounting unit is slidably provided in the limited position cavity; the control valve assembly controls the switching connection between the limited position cavity and the oil outlet and return port of the hydraulic pump.

[0012] In some embodiments, the pressure regulating unit includes a first limiting portion, a second limiting portion, a first locking nut and a second locking nut; the first limiting portion and the second limiting portion cooperate to form the limiting cavity; the first limiting portion limits the first mounting unit from moving away from the second mounting unit; the second limiting portion limits the first mounting unit from moving close to the second mounting unit; the first limiting portion is detachably connected to the hydraulic pump through the first locking nut; the second limiting portion is detachably connected to the hydraulic pump through the second locking nut.

[0013] In some embodiments, the second limiting portion is a sleeve; the limiting cavity is provided at one end of the second limiting portion, and a sliding through hole is provided at the other end; the diameter of the sliding through hole is smaller than the diameter of the limiting cavity; the first installation unit includes an adjusting piston and a limiting ring; the adjusting piston and the limiting ring are integrally formed; the outer diameter of the limiting ring is larger than the diameter of the adjusting piston; the limiting ring is slidably arranged in the limiting cavity; the adjusting piston is slidably arranged in the sliding through hole; the first limiting portion blocks one end of the limiting cavity away from the sliding through hole.

[0014] In some embodiments, the control valve assembly includes a first reversing valve and a second reversing valve;

[0015] The first reversing valve has a first working position and a second working position; when the first reversing valve is in the first working position, the position limiting chamber is communicated with the oil outlet of the hydraulic pump; when the first reversing valve is in the second working position, the position limiting chamber is communicated with the oil return port of the hydraulic pump;

[0016] The second reversing valve has a first working position and a second working position; when the second reversing valve is in the first working position, the second accommodating chamber is connected to the oil outlet of the hydraulic pump; when the second reversing valve is in the second working position, the second accommodating chamber is connected to the oil return port of the hydraulic pump.

[0017] In some embodiments, the valve sleeve unit includes a first valve sleeve and a second valve sleeve; the first valve sleeve and the second valve sleeve are detachably connected; the outer peripheral wall of the first valve sleeve is provided with the constant pressure variable oil hole; the second channel includes a first sub-channel and a second sub-channel; the first channel is formed at one end of the first valve sleeve, and the first sub-channel is formed at the other end; the first accommodating chamber is provided inside the first valve sleeve; the second sub-channel is formed at one end of the second valve sleeve; the second accommodating chamber is provided inside the second valve sleeve; the inner diameter of the first sub-channel is smaller than the inner diameter of the second sub-channel;

[0018] The second valve core unit includes a push rod and a push piston; the push rod is slidably arranged in the first sub-channel; the end surface area of ​​the push rod facing the first valve core unit is smaller than the end surface area of ​​the first valve core unit facing the push rod; the push piston is slidably arranged in the second sub-channel; the end surface area of ​​the push piston facing the second accommodating chamber is larger than the end surface area of ​​the first valve core unit facing the push rod; a third accommodating chamber is formed between the end of the push piston close to the push rod and the first valve sleeve; the third accommodating chamber is connected to the return oil port of the hydraulic pump.

[0019] In a second aspect, the present invention provides a flight device, comprising any one of the multi-stage constant pressure variable regulation hydraulic systems of the first aspect, and further comprising:

[0020] The flight equipment body; the multi-stage constant pressure variable regulation hydraulic system is detachably connected to the flight equipment body.

[0021] In a third aspect, the present invention provides a multi-stage constant pressure variable regulation method for a hydraulic system of a flight device, the multi-stage constant pressure variable regulation method for a hydraulic system of a flight device being applied to the flight device of the second aspect, the multi-stage constant pressure variable regulation method for a hydraulic system of a flight device comprising:

[0022] Step S10: Based on the fact that the aircraft is in an operating state, obtaining an operating state type of the aircraft; the operating state type includes a plateau start-up state and a maneuvering state;

[0023] Step S20: Based on the fact that the flight equipment is in the plateau start-up state, controlling the control valve assembly to connect the second accommodating chamber with the oil outlet of the hydraulic pump;

[0024] Step S30 : Based on the fact that the flight equipment is in the maneuvering state, controlling the control valve assembly to connect the second accommodating chamber with the oil return port of the hydraulic pump.

[0025] In some embodiments, the multi-stage constant pressure variable regulation hydraulic system further includes a pressure regulating assembly; the pressure regulating assembly includes a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position cavity is provided inside the pressure regulating unit; one end of the first mounting unit is slidably disposed in the limited position cavity; the control valve assembly controls switching communication between the limited position cavity and the oil outlet and return port of the hydraulic pump;

[0026] The working state types also include plain start state and cruise state;

[0027] The step S20 further includes, based on the flight equipment being in the plateau start-up state, controlling the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump;

[0028] The step S30 further includes, based on the flight equipment being in the maneuvering state, controlling the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump;

[0029] The multi-stage constant pressure variable adjustment method for the hydraulic system of the flight equipment further includes:

[0030] Step S40: Based on the fact that the flight equipment is in the plain start-up state, controlling the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump, and controlling the control valve assembly to connect the second accommodating chamber with the oil outlet of the hydraulic pump;

[0031] Step S50: Based on the fact that the flight equipment is in the cruise state, control the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump, and control the control valve assembly to connect the second accommodating chamber with the oil return port of the hydraulic pump.

[0032] In some embodiments, the multi-stage constant pressure variable regulation hydraulic system further includes a pressure regulating assembly; the pressure regulating assembly includes a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position cavity is provided inside the pressure regulating unit; one end of the first mounting unit is slidably disposed in the limited position cavity; the control valve assembly controls switching communication between the limited position cavity and the oil outlet and return port of the hydraulic pump;

[0033] The working state types also include plain start state and cruise state;

[0034] The step S20 further includes, based on the flight equipment being in the plateau start-up state, controlling the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump;

[0035] The step S30 further includes, based on the flight equipment being in the maneuvering state, controlling the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump;

[0036] The multi-stage constant pressure variable adjustment method for the hydraulic system of the flight equipment further includes:

[0037] Step S60: Based on the fact that the flight equipment is in the plain start-up state, controlling the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump, and controlling the control valve assembly to connect the second accommodating chamber with the oil return port of the hydraulic pump;

[0038] Step S70: Based on the fact that the flight equipment is in the cruise state, control the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump, and control the control valve assembly to connect the second chamber with the oil outlet of the hydraulic pump.

[0039] To solve the problem that the single-stage constant pressure variable type of the pressure regulating mechanism of the conventional aircraft engine drive pump cannot meet various complex working conditions, the present invention has the following advantages:

[0040] The present invention utilizes a first valve core unit and a second valve core unit with different end surface areas to achieve two-stage constant pressure variable regulation of the hydraulic pump, enabling the hydraulic pump to adapt to increasingly complex and changing regional environments, thereby reducing energy consumption. Furthermore, the present invention boasts a compact structure and lightweight weight, and the pressure of the multi-stage constant pressure variable regulation function can be adjusted by changing the dimensions of a few components or manually, making it highly adaptable. This invention meets the increasingly diverse operating requirements of aircraft and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a multi-stage constant pressure variable regulation hydraulic system according to an embodiment is shown;

[0042] Figure 2 Shown Figure 1 A partial enlarged view of part A of the multi-stage constant pressure variable regulation hydraulic system shown;

[0043] Figure 3 A schematic flow chart of a multi-stage constant pressure variable adjustment method for a hydraulic system of a flight equipment according to an embodiment is shown.

[0044] Figure numerals: 10 elastic component; 11 elastic unit; 12 first mounting unit; 121 regulating piston; 122 limiting ring; 13 second mounting unit; 20 valve seat assembly; 21 valve sleeve unit; 211 first valve sleeve; 212 second valve sleeve; 22 constant pressure variable oil hole; 23 first channel; 24 first accommodating chamber; 25 second channel; 251 first sub-channel; 252 second sub-channel; 26 second accommodating chamber; 27 third accommodating chamber; 30 valve core assembly; 31 first valve core unit; 32 second valve core unit; 321 push rod; 322 pushing piston; 40 hydraulic pump assembly; 41 hydraulic pump; 42 oil outlet; 43 oil return port; 50 control valve assembly; 51 first reversing valve; 52 second reversing valve; 60 pressure regulating assembly; 61 pressure regulating unit; 611 first limiting portion; 612 second limiting portion; 62 first locking nut; 63 second locking nut; 64 limiting chamber; 65 sliding through hole. DETAILED DESCRIPTION

[0045] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0046] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0047] During the driving process of the flight equipment, the hydraulic pump 41 is an important mechanism for providing it with hydraulic energy. The hydraulic pump 41 provides driving force for the retracting and extending of the landing gear or other hydraulic actuators of the flight equipment during take-off and landing. At the same time, the flight equipment has different pressure requirements for the hydraulic system in different states and flight environments. For example, when taking off in plateau areas, the hydraulic pump 41 needs to maintain a lower pressure, while the pressure required in plain areas is higher. The existing flight equipment hydraulic system pressure regulating mechanisms mostly adopt a single-stage constant pressure variable form, which cannot meet the complex working conditions of the aircraft. In this regard, a multi-stage constant pressure variable regulating hydraulic system is provided in this embodiment, such as Figure 1 As shown, the multi-stage constant pressure variable regulating hydraulic system includes an elastic component 10 , a valve seat component 20 , a valve core component 30 , a hydraulic pump 41 component 40 and a control valve component 50 .

[0048] The elastic assembly 10 may include an elastic unit 11, a first mounting unit 12, and a second mounting unit 13. One end of the elastic unit 11 is detachably connected to the first mounting unit 12, and the other end of the elastic unit 11 is detachably connected to the second mounting unit 13.

[0049] The valve seat assembly 20 includes a valve sleeve unit 21. A constant-pressure variable oil hole 22 is defined on the outer wall of the valve sleeve unit 21. The interior of the valve sleeve unit 21 may be provided with a first channel 23, a first accommodating chamber 24, a second channel 25, and a second accommodating chamber 26, which are sequentially connected. The constant-pressure variable oil hole 22 is connected to the first channel 23.

[0050] The valve core assembly 30 may include a first valve core unit 31 and a second valve core unit 32. The first valve core unit 31 is slidably disposed in the first channel 23, and the second valve core unit 32 is slidably disposed in the second channel 25. The end surface area of ​​the first valve core unit 31 facing the second valve core unit 32 is larger than the end surface area of ​​the second valve core unit 32 facing the first valve core unit 31, and the end surface area of ​​the second valve core unit 32 away from the first valve core unit 31 is larger than the end surface area of ​​the first valve core unit 31 facing the second valve core unit 32. The end of the first valve core unit 31 away from the second valve core unit 32 is detachably connected to the second mounting unit 13. When the first valve core unit 31 moves toward the elastic component 10, it can open the constant pressure variable oil hole 22 to connect it with the first accommodating chamber 24; when the first valve core unit 31 moves away from the elastic component 10, it can block the constant pressure variable oil hole 22 from connecting with the first accommodating chamber 24.

[0051] The hydraulic pump 41 assembly 40 includes a hydraulic pump 41 having an oil outlet 42 and an oil return port 43. The oil outlet 42 of the hydraulic pump 41 is connected to the first accommodating chamber 24. The first mounting unit 12 is detachably connected to the hydraulic pump 41 assembly 40.

[0052] The control valve assembly 50 controls the second accommodating chamber 26 to switch between the oil outlet 42 and the oil return port 43 of the hydraulic pump 41 .

[0053] The multi-stage constant pressure variable regulation hydraulic system may include two states: a first state and a second state.

[0054] The first state may include: the first accommodating chamber 24 is connected to the oil outlet 42, the second accommodating chamber 26 is connected to the oil return port 43, the second valve core unit 32 is spaced apart from the first valve core unit 31, and the first valve core unit 31 pushes the first mounting unit 12 toward the elastic unit 11 under a first pressure, thereby opening the first valve core unit 31 by overcoming the elastic force of the elastic component 10, and the constant pressure variable oil hole 22 is connected to the first accommodating chamber 24 to realize the constant pressure variable function. The first pressure is the pressure of the oil acting on the first valve core unit 31, which is also the rated pressure of the hydraulic pump 41 in the first state.

[0055] The second state can include the first accommodating chamber 24 and the second accommodating chamber 26 being connected to the oil outlet 42. The second valve core unit 32 abuts against the first valve core unit 31, so that the first valve core unit 31 pushes the first mounting unit 12 toward the elastic unit 11 under the second pressure, thereby overcoming the elastic force of the elastic component 10 and opening the first valve core unit 31. The constant pressure variable oil hole 22 is connected to the first accommodating chamber 24 to realize the constant pressure variable function.

[0056] When both the first accommodating chamber 24 and the second accommodating chamber 26 are connected to the oil outlet 42, the oil pressure in the first accommodating chamber 24 and the second accommodating chamber 26 is the same. However, the end surface area of ​​the second valve core unit 32 facing the second accommodating chamber 26 is larger than the end surface area of ​​the first valve core unit 31 facing the first accommodating chamber 24. Therefore, according to the formula that thrust equals oil pressure multiplied by area, it can be concluded that the thrust of the hydraulic oil on the second valve core unit 32 is greater than the thrust of the hydraulic oil on the first valve core unit 31, thereby enabling the second valve core unit 32 to move toward the first valve core unit 31, thereby pushing the first valve core unit 31 to open the constant-pressure variable oil hole 22. The rated pressure of the hydraulic pump 41 in the second state at this time is the second pressure. Since the elastic force of the elastic unit 11 is constant, using the second valve core unit 32 to open the constant-pressure variable oil hole 22 can reduce the opening pressure of the constant-pressure variable oil hole 22, that is, the second pressure is lower than the first pressure.

[0057] In this embodiment, if Figure 1 As shown, the multi-stage constant pressure variable regulation hydraulic system can also include a pressure regulating assembly 60. The pressure regulating assembly 60 includes a pressure regulating unit 61, which is detachably connected to the hydraulic pump 41. A limited position chamber 64 is provided within the pressure regulating unit 61. One end of the first mounting unit 12 is slidably disposed within the limited position chamber 64. The control valve assembly 50 controls the limited position chamber 64 to switch between the oil outlet 42 and the oil return port 43 of the hydraulic pump 41. When the limited position chamber 64 is connected to the oil outlet 42 of the hydraulic pump 41, the higher outlet pressure of the hydraulic pump 41 increases the oil pressure in the limited position chamber 64, thereby pushing the first mounting unit 12 toward the elastic unit 11, compressing the elastic unit 11 and increasing the preload force. When the limited position chamber 64 is connected to the oil return port 43 of the hydraulic pump 41, the first mounting unit 12 moves away from the elastic unit 11, causing the elastic unit 11 to expand and reducing the preload force. By controlling the limiting chamber 64 to be connected to the oil outlet 42 or the oil return port 43 of the hydraulic pump 41 and controlling the second accommodating chamber 26 to be connected to the oil outlet 42 or the oil return port 43 of the hydraulic pump 41 , the hydraulic pump 41 can achieve four-level constant pressure variable regulation.

[0058] When the limiting chamber 64 is connected to the oil outlet 42 of the hydraulic pump 41 and the second accommodating chamber 26 is connected to the oil return port 43, the rated pressure of the hydraulic pump 41 is the maximum; when the limiting chamber 64 is connected to the oil return port 43 of the hydraulic pump 41 and the second accommodating chamber 26 is connected to the oil outlet 42, the rated pressure of the hydraulic pump 41 is the minimum.

[0059] In this embodiment, if Figure 1 As shown, the pressure regulating unit 61 may include a first limiting portion 611, a second limiting portion 612, a first locking nut 62, and a second locking nut 63. The first limiting portion 611 and the second limiting portion 612 cooperate to form a limiting cavity 64, within which one end of the first mounting unit 12 is slidably disposed. The first limiting portion 611 limits movement of the first mounting unit 12 away from the second mounting unit 13, while the second limiting portion 612 limits movement of the first mounting unit 12 toward the second mounting unit 13. The first limiting portion 611 is detachably connected to the hydraulic pump 41 via the first locking nut 62, while the second limiting portion 612 is detachably connected to the hydraulic pump 41 via the second locking nut 63. Adjusting the first locking nut 62 adjusts the position of the first limiting portion 611, thereby limiting the minimum value of the preload force of the elastic unit 11. Adjusting the second locking nut 63 adjusts the position of the second limiting portion 612, thereby limiting the maximum value of the preload force of the elastic unit 11, thereby achieving appropriate adjustment of the required rated pressure under different operating conditions.

[0060] In this embodiment, if Figure 1 As shown, the second limiting portion 612 is a sleeve. A limiting cavity 64 is defined at one end of the second limiting portion 612, and a sliding through hole 65 is defined at the other end; the diameter of the sliding through hole 65 is smaller than the diameter of the limiting cavity 64. The first mounting unit 12 includes an adjusting piston 121 and a limiting ring 122. The adjusting piston 121 and the limiting ring 122 are integrally formed, and the outer diameter of the limiting ring 122 is larger than the diameter of the adjusting piston 121. The limiting ring 122 can be slidably disposed in the limiting cavity 64, and the adjusting piston 121 can be slidably disposed in the sliding through hole 65. The first limiting portion 611 blocks the end of the limiting cavity 64 away from the sliding through hole 65.

[0061] In another embodiment, the limiting cavity 64 may also be the inner cavity of the first limiting portion 611, and the second limiting portion 612 is inserted into the limiting cavity 64 to block the end of the limiting cavity 64 facing the elastic unit 11. The second limiting portion 612 has only a sliding hole 65.

[0062] In this embodiment, if Figure 1 As shown, the control valve assembly 50 may include a first reversing valve 51 and a second reversing valve 52 .

[0063] The first reversing valve 51 has a first working position and a second working position. When the first reversing valve 51 is in the first working position, the limiting chamber 64 communicates with the oil outlet 42 of the hydraulic pump 41, the first mounting unit 12 abuts the second limiting portion 612, the elastic unit 11 is compressed, and the preload force increases. When the first reversing valve 51 is in the second working position, the limiting chamber 64 communicates with the oil return port 43 of the hydraulic pump 41, the first mounting unit 12 abuts the first limiting portion 611, the elastic unit 11 expands, and the preload force decreases.

[0064] The second reversing valve 52 has a first working position and a second working position. When the second reversing valve 52 is in the first working position, the second accommodating chamber 26 communicates with the oil outlet 42 of the hydraulic pump 41, the multi-stage constant-pressure variable-adjustable hydraulic system is in the second state, and the second valve core unit 32 abuts the first valve core unit 31. When the second reversing valve 52 is in the second working position, the second accommodating chamber 26 communicates with the oil return port 43 of the hydraulic pump 41, the multi-stage constant-pressure variable-adjustable hydraulic system is in the first state, and the second valve core unit 32 is spaced apart from the first valve core unit 31.

[0065] By controlling the first reversing valve 51 and the second reversing valve 52 , four-level constant pressure variable regulation of the hydraulic system can be achieved.

[0066] In this embodiment, if Figure 1 As shown, the valve sleeve unit 21 may include a first valve sleeve 211 and a second valve sleeve 212, and the first valve sleeve 211 and the second valve sleeve 212 are detachably connected. A constant pressure variable oil hole 22 is provided on the outer peripheral wall of the first valve sleeve 211. When the first valve core unit 31 is opened, the constant pressure variable oil hole 22 can be connected to the first accommodating chamber 24, thereby outputting oil. The second channel 25 may include a first sub-channel 251 and a second sub-channel 252. A first channel 23 is formed at one end of the first valve sleeve 211, and a first sub-channel 251 is formed at the other end. The first accommodating chamber 24 is arranged between the first channel 23 and the first sub-channel 251. A second sub-channel 252 is formed at one end of the second valve sleeve 212, and the second accommodating chamber 26 is arranged inside the second valve sleeve 212. The inner diameter of the first sub-channel 251 is smaller than the inner diameter of the second sub-channel 252.

[0067] The second valve core unit 32 may include a push rod 321 and a push piston 322. The push rod 321 is slidably disposed within the first sub-channel 251. The end surface area of ​​the push rod 321 facing the first valve core unit 31 is smaller than the end surface area of ​​the first valve core unit 31 facing the push rod 321. The push piston 322 is slidably disposed within the second sub-channel 252. The end surface area of ​​the push piston 322 facing the second accommodating chamber 26 is larger than the end surface area of ​​the first valve core unit 31 facing the push rod 321. Thus, the presence of the second valve core unit 32 can reduce the opening pressure of the first valve core unit 31. A third accommodating chamber 27 is formed between the end of the push piston 322 near the push rod 321 and the first valve sleeve 211. The third accommodating chamber 27 is connected to the oil return port 43 of the hydraulic pump 41. As the push piston 322 slides toward the first valve core unit 31, the hydraulic oil in the third accommodating chamber 27 can flow back to the oil tank, avoiding resistance.

[0068] This embodiment provides an aircraft device, comprising a multi-stage constant-pressure variable-adjustable hydraulic system according to any of the aforementioned embodiments, and further comprising an aircraft device body. The multi-stage constant-pressure variable-adjustable hydraulic system is detachably connected to the aircraft device body. This multi-stage constant-pressure variable-adjustable hydraulic system enables hydraulic actuators on the aircraft device to operate at varying pressures under different operating conditions, thereby reducing energy consumption while meeting the actuator's starting load.

[0069] In this embodiment, a multi-stage constant pressure variable adjustment method for a hydraulic system of an aircraft device is provided. The multi-stage constant pressure variable adjustment method for a hydraulic system of an aircraft device is applied to the aircraft in the above embodiment, such as Figure 1 As shown, the multi-stage constant pressure variable adjustment method for the hydraulic system of the flight equipment may include steps S10 to S30, each of which is described in detail as follows:

[0070] Step S10: Based on the aircraft being in an operating state, the operating state type of the aircraft is obtained. The operating state type may include a plateau start-up state and a maneuvering state. In the plateau start-up state, the thin air causes a smaller starting load on the hydraulic mechanisms of the aircraft. In the maneuvering state, the mechanisms are in motion, requiring a larger starting load.

[0071] In step S20, based on the aircraft being in the plateau startup state, the control valve assembly 50 can be controlled to connect the second accommodating chamber 26 with the oil outlet 42 of the hydraulic pump 41. At this time, the first accommodating chamber 24 and the second accommodating chamber 26 are both connected to the oil outlet 42. The oil pressure in the first accommodating chamber 24 and the second accommodating chamber 26 is consistent, but the end surface area of ​​the second valve core unit 32 facing the second accommodating chamber 26 is larger than the end surface area of ​​the second valve core unit 32 facing the first accommodating chamber 24. As a result, the thrust of the hydraulic oil on the second valve core unit 32 toward one end of the second accommodating chamber 26 is greater than the thrust of the hydraulic oil in the first accommodating chamber 24 on the second valve core unit 32 toward one end of the first accommodating chamber 24. The oil can push the second valve core unit 32 to slide toward the first valve core unit 31, thereby pushing the first valve core unit 31 to open the constant pressure variable oil hole 22. Since the elastic force of the elastic unit 11 is constant, the second valve core unit 32 is used to open the constant pressure variable oil hole 22, which can reduce the opening pressure of the constant pressure variable oil hole 22, that is, the rated pressure of the hydraulic pump 41 in this state is lower.

[0072] In step S30, based on the aircraft being in a maneuvering state, the control valve assembly 50 can be controlled to connect the second accommodating chamber 26 with the oil return port 43 of the hydraulic pump 41. The oil can directly push the first valve core assembly 30 to open, and the opening pressure of the first valve core assembly 30 is relatively large.

[0073] In this embodiment, the multi-stage constant pressure variable regulation hydraulic system also includes a pressure regulating assembly 60. The pressure regulating assembly 60 includes a pressure regulating unit 61, which is detachably connected to the hydraulic pump 41. A limiting cavity 64 is provided inside the pressure regulating unit 61, and one end of the first mounting unit 12 is slidably provided in the limiting cavity 64. The control valve assembly 50 controls the limiting cavity 64 to switch between the oil outlet 42 and the oil return port 43 of the hydraulic pump 41, so that the first mounting unit 12 can have two working positions. When the limiting cavity 64 is connected to the oil outlet 42 of the hydraulic pump 41, the first mounting unit 12 approaches the elastic unit 11, the elastic unit 11 is compressed, and the preload force increases; when the limiting cavity 64 is connected to the oil return port 43 of the hydraulic pump 41, the first mounting unit 12 moves away from the elastic unit 11, the elastic unit 11 stretches, and the preload force decreases. By controlling the limiting chamber 64 to be connected to the oil outlet 42 or the oil return port 43 of the hydraulic pump 41 and controlling the second accommodating chamber 26 to be connected to the oil outlet 42 or the oil return port 43 of the hydraulic pump 41 , the hydraulic pump 41 can achieve four-level constant pressure variable regulation.

[0074] The working state types also include plain starting state and cruising state. In the plain starting state and cruising state, the power demand of the hydraulic system is not high and the pressure demand is moderate, but appropriate pressure must be maintained to maintain the flight attitude and achieve energy consumption reduction.

[0075] Step S20 also includes, based on the flight equipment being in a plateau startup state, controlling the control valve assembly 50 to connect the limit chamber 64 with the return oil port 43 of the hydraulic pump 41, so that the elastic assembly 10 is in an extended state and the preload force is reduced. Combined with the second accommodating chamber 26 being connected with the oil outlet 42 of the hydraulic pump 41, one of the lowest rated pressures of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0076] Step S30 also includes, based on the flight equipment being in a maneuverable state, controlling the control valve assembly 50 to connect the limit chamber 64 with the oil outlet 42 of the hydraulic pump 41, so that the elastic assembly 10 is in a compressed state, the preload force is increased, and combined with the second accommodating chamber 26 being connected with the return oil port 43 of the hydraulic pump 41, the largest rated pressure of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0077] The multi-stage constant pressure variable adjustment method of the flight equipment hydraulic system also includes:

[0078] In step S40, based on the flight equipment being in a plain starting state, the control valve assembly 50 is controlled to connect the limit chamber 64 with the oil outlet 42 of the hydraulic pump 41, so that the elastic assembly 10 is in a compressed state and the preload force is increased. At the same time, the control valve assembly 50 is controlled to connect the second accommodating chamber 26 with the oil outlet 42 of the hydraulic pump 41, thereby reducing the opening pressure of the first valve core unit 31, thereby maintaining appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0079] In step S50, based on the fact that the flight equipment is in a cruising state, the control valve assembly 50 is controlled to connect the limit chamber 64 with the oil return port 43 of the hydraulic pump 41, so that the elastic assembly 10 is in an extended state and the preload force is reduced. At the same time, the control valve assembly 50 is controlled to connect the second accommodating chamber 26 with the oil return port 43 of the hydraulic pump 41, so that the opening pressure of the first valve core assembly 30 is larger, which can achieve the maintenance of appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0080] In this embodiment, the multi-stage constant pressure variable regulation hydraulic system further includes a pressure regulating assembly 60; the pressure regulating assembly 60 includes a pressure regulating unit 61; the pressure regulating unit 61 is detachably connected to the hydraulic pump 41; a limited position chamber 64 is provided inside the pressure regulating unit 61; one end of the first mounting unit 12 is slidably disposed in the limited position chamber 64; the control valve assembly 50 controls the switching communication between the limited position chamber 64 and the oil outlet 42 and the oil return port 43 of the hydraulic pump 41, so that the first mounting unit 12 can have two working positions. When the limited position chamber 64 is connected to the oil outlet 42 of the hydraulic pump 41, the first mounting unit 12 approaches the elastic unit 11, the elastic unit 11 is compressed, and the preload force increases; when the limited position chamber 64 is connected to the oil return port 43 of the hydraulic pump 41, the first mounting unit 12 moves away from the elastic unit 11, the elastic unit 11 stretches, and the preload force decreases. By controlling the limiting chamber 64 to be connected to the oil outlet 42 or the oil return port 43 of the hydraulic pump 41 and controlling the second accommodating chamber 26 to be connected to the oil outlet 42 or the oil return port 43 of the hydraulic pump 41 , the hydraulic pump 41 can achieve four-level constant pressure variable regulation.

[0081] The working state types also include plain starting state and cruising state. In the plain starting state and cruising state, the power demand of the hydraulic system is not high and the pressure demand is moderate, but appropriate pressure must be maintained to maintain the flight attitude and achieve energy consumption reduction.

[0082] Step S20 also includes, based on the flight equipment being in a plateau startup state, controlling the control valve assembly 50 to connect the limit chamber 64 with the return oil port 43 of the hydraulic pump 41, so that the elastic assembly 10 is in an extended state and the preload force is reduced. Combined with the second accommodating chamber 26 being connected with the oil outlet 42 of the hydraulic pump 41, one of the lowest rated pressures of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0083] Step S30 also includes, based on the flight equipment being in a maneuverable state, controlling the control valve assembly 50 to connect the limit chamber 64 with the oil outlet 42 of the hydraulic pump 41, so that the elastic assembly 10 is in a compressed state, the preload force is increased, and combined with the second accommodating chamber 26 being connected with the return oil port 43 of the hydraulic pump 41, the largest rated pressure of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0084] The multi-stage constant pressure variable adjustment method of the flight equipment hydraulic system also includes:

[0085] Step S60, based on the flight equipment being in the plain starting state, the control valve assembly 50 is controlled to connect the limit chamber 64 with the return oil port 43 of the hydraulic pump 41, so that the elastic assembly 10 is in an extended state and the preload force is reduced. At the same time, the control valve assembly 50 is controlled to connect the second accommodating chamber 26 with the return oil port 43 of the hydraulic pump 41, so that the opening pressure of the first valve core assembly 30 is larger, which can achieve maintaining appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0086] In step S70, based on the fact that the flight equipment is in a cruising state, the control valve assembly 50 is controlled to connect the limit chamber 64 with the oil outlet 42 of the hydraulic pump 41, so that the elastic assembly 10 is in a compressed state and the preload force is increased. At the same time, the control valve assembly 50 is controlled to connect the second accommodating chamber 26 with the oil outlet 42 of the hydraulic pump 41, thereby reducing the opening pressure of the first valve core unit 31, thereby maintaining appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0087] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A multi-stage constant pressure variable regulation hydraulic system, characterized in that: The multi-stage constant pressure variable regulation hydraulic system includes: An elastic component, the elastic component comprising an elastic unit, a first mounting unit, and a second mounting unit; one end of the elastic unit is detachably connected to the first mounting unit, and the other end of the elastic unit is detachably connected to the second mounting unit; A valve seat assembly, the valve seat assembly comprising a valve sleeve unit; a constant-pressure variable oil hole is formed on an outer wall of the valve sleeve unit; a first channel, a first accommodating chamber, a second channel, and a second accommodating chamber are sequentially connected within the valve sleeve unit; the constant-pressure variable oil hole is connected to the first channel; The valve core assembly comprises a first valve core unit and a second valve core unit; the first valve core unit is slidingly arranged in the first channel; the second valve core unit is slidingly arranged in the second channel; the end surface area of ​​the first valve core unit facing the second valve core unit is larger than the end surface area of ​​the second valve core unit facing the first valve core unit; the end surface area of ​​the second valve core unit away from the first valve core unit is larger than the end surface area of ​​the first valve core unit facing the second valve core unit; the end of the first valve core unit away from the second valve core unit is detachably connected to the second mounting unit; when the first valve core unit moves toward the elastic component, it can open the constant-pressure variable oil hole and communicate with the first accommodating chamber; when the first valve core unit moves away from the elastic component, it can block the constant-pressure variable oil hole from communicating with the first accommodating chamber; A hydraulic pump assembly, the hydraulic pump assembly comprising a hydraulic pump; the hydraulic pump having an oil outlet and an oil return port; the oil outlet of the hydraulic pump being in communication with the first accommodating chamber; the first mounting unit being detachably connected to the hydraulic pump assembly; A control valve assembly controls the second accommodating chamber to switch between the oil outlet and the oil return port of the hydraulic pump.

2. A multi-stage constant pressure variable regulation hydraulic system according to claim 1, characterized in that: The multi-stage constant pressure variable regulation hydraulic system also includes a pressure regulating component; the pressure regulating component includes a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position cavity is arranged inside the pressure regulating unit; one end of the first mounting unit is slidably arranged in the limited position cavity; the control valve assembly controls the switching connection between the limited position cavity and the oil outlet and return port of the hydraulic pump.

3. A multi-stage constant pressure variable regulation hydraulic system according to claim 2, characterized in that: The pressure regulating unit includes a first limiting portion, a second limiting portion, a first locking nut and a second locking nut; the first limiting portion and the second limiting portion cooperate to form the limiting cavity; the first limiting portion limits the first mounting unit from moving away from the second mounting unit; the second limiting portion limits the first mounting unit from moving close to the second mounting unit; the first limiting portion is detachably connected to the hydraulic pump through the first locking nut; the second limiting portion is detachably connected to the hydraulic pump through the second locking nut.

4. A multi-stage constant pressure variable regulation hydraulic system according to claim 3, characterized in that: The second limiting part is a sleeve; the limiting cavity is provided at one end of the second limiting part, and a sliding through hole is provided at the other end; the diameter of the sliding through hole is smaller than the diameter of the limiting cavity; the first installation unit includes an adjusting piston and a limiting ring; the adjusting piston and the limiting ring are integrally formed; the outer diameter of the limiting ring is larger than the diameter of the adjusting piston; the limiting ring is slidably arranged in the limiting cavity; the adjusting piston is slidably arranged in the sliding through hole; the first limiting part blocks one end of the limiting cavity away from the sliding through hole.

5. The multi-stage constant pressure variable regulation hydraulic system according to claim 2, characterized in that: The control valve assembly includes a first reversing valve and a second reversing valve; The first reversing valve has a first working position and a second working position; when the first reversing valve is in the first working position, the position limiting chamber is communicated with the oil outlet of the hydraulic pump; when the first reversing valve is in the second working position, the position limiting chamber is communicated with the oil return port of the hydraulic pump; The second reversing valve has a first working position and a second working position; when the second reversing valve is in the first working position, the second accommodating chamber is connected to the oil outlet of the hydraulic pump; when the second reversing valve is in the second working position, the second accommodating chamber is connected to the oil return port of the hydraulic pump.

6. The multi-stage constant pressure variable regulation hydraulic system according to claim 1, characterized in that: The valve sleeve unit includes a first valve sleeve and a second valve sleeve; the first valve sleeve and the second valve sleeve are detachably connected; the outer peripheral wall of the first valve sleeve is provided with the constant pressure variable oil hole; the second channel includes a first sub-channel and a second sub-channel; the first channel is formed at one end of the first valve sleeve, and the first sub-channel is formed at the other end; the first accommodating chamber is provided inside the first valve sleeve; the second sub-channel is formed at one end of the second valve sleeve; the second accommodating chamber is provided inside the second valve sleeve; the inner diameter of the first sub-channel is smaller than the inner diameter of the second sub-channel; The second valve core unit includes a push rod and a push piston; the push rod is slidably arranged in the first sub-channel; the end surface area of ​​the push rod facing the first valve core unit is smaller than the end surface area of ​​the first valve core unit facing the push rod; the push piston is slidably arranged in the second sub-channel; the end surface area of ​​the push piston facing the second accommodating chamber is larger than the end surface area of ​​the first valve core unit facing the push rod; a third accommodating chamber is formed between the end of the push piston close to the push rod and the first valve sleeve; the third accommodating chamber is connected to the return oil port of the hydraulic pump.

7. A flying device, characterized in that: The flight equipment includes: The multi-stage constant pressure variable regulation hydraulic system according to claim 1; The flight equipment body; the multi-stage constant pressure variable regulation hydraulic system is detachably connected to the flight equipment body.

8. A multi-stage constant pressure variable control method for a hydraulic system of an aircraft, applied to the aircraft according to claim 7, characterized in that: The multi-stage constant pressure variable adjustment method of the flight equipment hydraulic system includes: Step S10: Based on the fact that the aircraft is in an operating state, obtaining an operating state type of the aircraft; the operating state type includes a plateau start-up state and a maneuvering state; Step S20: Based on the fact that the flight equipment is in the plateau start-up state, controlling the control valve assembly to connect the second accommodating chamber with the oil outlet of the hydraulic pump; Step S30 : Based on the fact that the flight equipment is in the maneuvering state, controlling the control valve assembly to connect the second accommodating chamber with the oil return port of the hydraulic pump.

9. A multi-stage constant pressure variable adjustment method for a hydraulic system of a flight equipment according to claim 8, characterized in that: The multi-stage constant pressure variable regulation hydraulic system further includes a pressure regulating assembly; the pressure regulating assembly includes a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position cavity is provided inside the pressure regulating unit; one end of the first mounting unit is slidably disposed in the limited position cavity; the control valve assembly controls switching communication between the limited position cavity and the oil outlet and return port of the hydraulic pump; The working state types also include plain start state and cruise state; The step S20 further includes, based on the flight equipment being in the plateau start-up state, controlling the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump; The step S30 further includes, based on the flight equipment being in the maneuvering state, controlling the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump; The multi-stage constant pressure variable adjustment method for the hydraulic system of the flight equipment further includes: Step S40: Based on the fact that the flight equipment is in the plain start-up state, controlling the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump, and controlling the control valve assembly to connect the second accommodating chamber with the oil outlet of the hydraulic pump; Step S50: Based on the fact that the flight equipment is in the cruise state, control the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump, and control the control valve assembly to connect the second accommodating chamber with the oil return port of the hydraulic pump.

10. A multi-stage constant pressure variable adjustment method for a hydraulic system of a flight equipment according to claim 8, characterized in that: The multi-stage constant pressure variable regulation hydraulic system further includes a pressure regulating assembly; the pressure regulating assembly includes a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position cavity is provided inside the pressure regulating unit; one end of the first mounting unit is slidably disposed in the limited position cavity; the control valve assembly controls switching communication between the limited position cavity and the oil outlet and return port of the hydraulic pump; The working state types also include plain start state and cruise state; The step S20 further includes, based on the flight equipment being in the plateau start-up state, controlling the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump; The step S30 further includes, based on the flight equipment being in the maneuvering state, controlling the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump; The multi-stage constant pressure variable adjustment method for the hydraulic system of the flight equipment further includes: Step S60: Based on the fact that the flight equipment is in the plain start-up state, controlling the control valve assembly to connect the limit chamber with the oil return port of the hydraulic pump, and controlling the control valve assembly to connect the second accommodating chamber with the oil return port of the hydraulic pump; Step S70: Based on the fact that the flight equipment is in the cruise state, control the control valve assembly to connect the limit chamber with the oil outlet of the hydraulic pump, and control the control valve assembly to connect the second chamber with the oil outlet of the hydraulic pump.

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