Multi-stage constant-pressure variable adjustment hydraulic system, flight equipment and method

Abstract

The invention relates to the technical field of hydraulic systems, in particular to a multistage constant-pressure variable adjusting hydraulic system, flight equipment and a method. The multi-stage constant-pressure variable adjusting hydraulic system comprises an elastic assembly, a valve seat assembly, a valve element assembly, a hydraulic pump assembly and a control valve assembly. A constant-pressure variable oil hole is formed in the outer wall of the valve seat assembly, and a first channel, a first containing cavity, a second channel and a second containing cavity which are sequentially communicated are formed in the valve seat assembly. The valve element assembly comprises a first valve element unit and a second valve element unit, and the end face area, away from the first valve element unit, of the second valve element unit is larger than the end face area, facing the second valve element unit, of the first valve element unit. The control valve assembly controls the second containing cavity to be switched and communicated between the oil outlet and the oil return opening of the hydraulic pump, and therefore the opening pressure of the constant-pressure variable oil hole is changed. Therefore, the problem that a single-stage constant-pressure variable form of a pressure regulating mechanism of a conventional flight equipment engine driving pump cannot meet various complex working conditions is solved.

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] Flight equipment usually requires an engine to achieve takeoff, attitude adjustment, and flight attitude maintenance. Taking an aircraft as an example, the engine-driven pump is the "heart" of the aircraft hydraulic system and the hydraulic energy provider of the hydraulic system. Hydraulic actuators such as landing gear, rudders, and various doors in the aircraft hydraulic system all require the engine-driven pump to provide hydraulic energy to perform corresponding actions. However, the pressure requirements for the hydraulic system are different in different usage scenarios. For example, when the aircraft is in a maneuvering state, the hydraulic pump and the hydraulic system in which it is located are required to be in a high-pressure, high-flow state to meet the requirements of various aircraft actuators. In cruising and other states, the hydraulic system has a low power demand, a low power demand, and a moderate pressure demand, but it is necessary to maintain appropriate pressure to maintain the flight attitude and achieve low energy consumption in the cruising state. In addition, depending on the region, the starting load required for flight equipment will also vary. The air in plateau areas is thin, and the starting load is low, while the starting load in relatively plain areas is higher.

[0003] Existing flight equipment engine drive pump pressure regulating mechanisms mostly adopt a single-stage constant pressure variable form, which cannot meet the complex working conditions of flight 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 flight equipment engine driving pump cannot meet various complex working conditions, the present invention provides a multi-stage constant pressure variable regulating hydraulic system, flight 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: 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 provided on the outer wall of the valve sleeve unit; a first channel, a first accommodating chamber, a second channel and a second accommodating chamber are provided inside the valve sleeve unit and are connected in sequence; the constant pressure variable oil hole is connected to the first channel; A valve core assembly, the valve core assembly comprising a first valve core unit and a second valve core unit; the first valve core unit is slidably arranged in the first channel; the second valve core unit is slidably 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; the first valve core unit can open the constant-pressure variable oil hole and communicate with the first accommodating chamber when it moves toward the elastic assembly; the first valve core unit can block the constant-pressure variable oil hole from communicating with the first accommodating chamber when it moves away from the elastic assembly; A hydraulic pump assembly, the hydraulic pump assembly comprising a hydraulic pump; the hydraulic pump has an oil outlet and an oil return port; the oil outlet of the hydraulic pump is communicated with the first accommodating chamber; the first mounting unit is 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.

[0006] In some embodiments, 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.

[0007] 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.

[0008] In some embodiments, the second limiting portion is a sleeve; the limiting cavity is formed at one end of the second limiting portion, and a sliding through hole is formed 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.

[0009] In some embodiments, 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 limit chamber is communicated with the oil outlet of the hydraulic pump; when the first reversing valve is in the second working position, the limit 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.

[0010] 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 valve sleeve is formed with the first channel at one end and the first sub-channel at the other end; the first accommodating chamber is arranged inside the first valve sleeve; the second sub-channel is formed at one end of the second valve sleeve; the second accommodating chamber is arranged 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 oil return port of the hydraulic pump.

[0011] In a second aspect, the present invention provides a flight device, the flight device comprising any one of the multi-stage constant pressure variable regulation hydraulic systems in the first aspect, the flight device further comprising: The flight equipment body; the multi-stage constant pressure variable regulating hydraulic system is detachably connected to the flight equipment body.

[0012] 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 is applied to the flight device in the second aspect, and the multi-stage constant pressure variable regulation method for a hydraulic system of a flight device comprises: Step S10, based on the fact that the flight device is in a working state, obtaining the working state type of the flight device; the working state type includes a plateau start 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.

[0013] In some embodiments, the multi-stage constant pressure variable regulating 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 chamber is provided inside the pressure regulating unit; one end of the first mounting unit is slidably disposed in the limited position chamber; the control valve assembly controls the limited position chamber to switch between the oil outlet and the oil 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 device 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 of the flight equipment hydraulic system also 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 chamber with the oil outlet of the hydraulic pump; Step S50, based on the flight equipment being in the cruising 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 chamber with the oil return port of the hydraulic pump.

[0014] In some embodiments, the multi-stage constant pressure variable regulating 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 chamber is provided inside the pressure regulating unit; one end of the first mounting unit is slidably disposed in the limited position chamber; the control valve assembly controls the limited position chamber to switch between the oil outlet and the oil 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 device 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 of the flight equipment hydraulic system also 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 chamber with the oil return port of the hydraulic pump; Step S70, based on the flight equipment being in the cruising 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 chamber with the oil outlet of the hydraulic pump.

[0015] In order to solve the problem that the single-stage constant pressure variable form of the pressure regulating mechanism of the conventional flight equipment engine driving pump cannot meet various complex working conditions, the present invention has the following advantages: The present invention utilizes the first valve core unit and the second valve core unit of different end surface areas to realize the two-stage constant pressure variable regulation of the hydraulic pump, so that the hydraulic pump can adapt to more complex and changeable regional environments, thereby achieving the effect of reducing energy consumption. In addition, the present invention has a compact structure and light weight, and the pressure of the multi-stage constant pressure variable regulation function can be adjusted by changing the size of a small number of parts or manually, and has strong applicability. The present invention conforms to the increasingly changeable working conditions of flight equipment and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a multi-stage constant pressure variable regulation hydraulic system according to an embodiment is shown; Figure 2 Shows Figure 1 A partial enlarged view of part A of the multi-stage constant pressure variable regulation hydraulic system shown; Figure 3 A schematic flow chart of a multi-stage constant pressure variable regulation method for a hydraulic system of a flight equipment according to an embodiment is shown.

[0017] Figure numerals: 10 elastic component; 11 elastic unit; 12 first installation unit; 121 regulating piston; 122 limiting ring; 13 second installation 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 push 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

[0018] 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 thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0019] As used herein, the term "including" and its variants 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". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or it can be 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 and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0020] 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 actions of retracting and extending 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 component 41 , and a control valve component 50 .

[0021] 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.

[0022] The valve seat assembly 20 includes a valve sleeve unit 21. The outer wall of the valve sleeve unit 21 is provided with a constant pressure variable oil hole 22. 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 that are connected in sequence. The constant pressure variable oil hole 22 is connected to the first channel 23.

[0023] 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 toward the second valve core unit 32 is larger than the end surface area of ​​the second valve core unit 32 toward 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 toward 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. In the process of the first valve core unit 31 moving toward the elastic component 10, the constant pressure variable oil hole 22 can be opened to communicate with the first accommodating chamber 24; when the first valve core unit 31 moves away from the elastic component 10, the constant pressure variable oil hole 22 can be blocked from communicating with the first accommodating chamber 24.

[0024] The hydraulic pump 41 assembly 40 includes a hydraulic pump 41, and the hydraulic pump 41 has an oil outlet 42 and an oil return port 43. The oil outlet 42 of the hydraulic pump 41 is communicated with the first accommodating chamber 24. The first mounting unit 12 is detachably connected to the hydraulic pump 41 assembly 40.

[0025] 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 .

[0026] The multi-stage constant pressure variable regulating hydraulic system may include two states: a first state and a second state.

[0027] The first state may include: the first accommodating chamber 24 is connected with the oil outlet 42, the second accommodating chamber 26 is connected with the oil return port 43, the second valve core unit 32 is spaced apart from the first valve core unit 31, the first valve core unit 31 pushes the first mounting unit 12 toward the elastic unit 11 under the first pressure, so that the first valve core unit 31 overcomes the elastic force of the elastic component 10 and opens, and the constant pressure variable oil hole 22 is connected with the first accommodating chamber 24 to realize the constant pressure variable function. The first pressure is the pressure of the oil on the first valve core unit 31, that is, the rated pressure of the hydraulic pump 41 in the first state.

[0028] The second state may include that the first accommodating chamber 24 and the second accommodating chamber 26 are both 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, so that the first valve core unit 31 overcomes the elastic force of the elastic component 10 and opens, and the constant pressure variable oil hole 22 is connected to the first accommodating chamber 24 to realize the constant pressure variable function.

[0029] Among them, when 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 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, so that the second valve core unit 32 can move toward the first valve core unit 31, and then push 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 less than the first pressure.

[0030] In this embodiment, if Figure 1 As shown, the multi-stage constant pressure variable regulation hydraulic system may further include a pressure regulating assembly 60. The pressure regulating assembly 60 includes a pressure regulating unit 61, and the pressure regulating unit 61 is detachably connected to the hydraulic pump 41. A limited position chamber 64 is arranged inside the pressure regulating unit 61, and one end of the first mounting unit 12 is slidably arranged in the limited position chamber 64, and the control valve assembly 50 controls the limited position chamber 64 to switch and communicate 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 oil pressure in the limited position chamber 64 increases due to the large outlet pressure of the hydraulic pump 41, and then the first mounting unit 12 can be pushed to move in the direction close to 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 limit 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.

[0031] When the limit 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 maximum; when the limit 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 minimum.

[0032] 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, and one end of the first mounting unit 12 is slidably disposed in the limiting cavity 64. The first limiting portion 611 can limit the first mounting unit 12 from moving away from the second mounting unit 13, and the second limiting portion 612 can limit the first mounting unit 12 from moving close to the second mounting unit 13. The first limiting portion 611 is detachably connected to the hydraulic pump 41 through the first locking nut 62, and the second limiting portion 612 is detachably connected to the hydraulic pump 41 through the second locking nut 63. By adjusting the first locking nut 62, the position of the first limiting portion 611 can be adjusted to thereby limit the minimum value of the preload force of the elastic unit 11, and by adjusting the second locking nut 63, the position of the second limiting portion 612 can be adjusted to thereby limit the maximum value of the preload force of the elastic unit 11, thereby achieving appropriate adjustment of the required rated pressure under different working conditions.

[0033] In this embodiment, if Figure 1 As shown, the second limiting portion 612 is a sleeve. A limiting cavity 64 is provided at one end of the second limiting portion 612, and a sliding through hole 65 is provided 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, the adjusting piston 121 can be slidably disposed in the sliding through hole 65, and the first limiting portion 611 blocks one end of the limiting cavity 64 away from the sliding through hole 65.

[0034] 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 one end of the limiting cavity 64 facing the elastic unit 11. The second limiting portion 612 has only a sliding through hole 65.

[0035] 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 .

[0036] 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 is connected to the oil outlet 42 of the hydraulic pump 41, the first mounting unit 12 abuts against 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 is connected to the oil return port 43 of the hydraulic pump 41, the first mounting unit 12 abuts against the first limiting portion 611, the elastic unit 11 stretches, and the preload force decreases.

[0037] 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 is connected to the oil outlet 42 of the hydraulic pump 41, the multi-stage constant pressure variable regulating hydraulic system is in the second state, and the second valve core unit 32 is in contact with the first valve core unit 31; when the second reversing valve 52 is in the second working position, the second accommodating chamber 26 is connected to the oil return port 43 of the hydraulic pump 41, the multi-stage constant pressure variable regulating hydraulic system is in the first state, and the second valve core unit 32 is spaced apart from the first valve core unit 31.

[0038] 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.

[0039] 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 to output 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.

[0040] The second valve core unit 32 may include a push rod 321 and a push piston 322. The push rod 321 is slidably disposed in the first sub-channel 251, and 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 in the second sub-channel 252, and 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, so that the existence 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 close to the push rod 321 and the first valve sleeve 211, and the third accommodating chamber 27 is connected to the oil return port 43 of the hydraulic pump 41. When 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 to avoid resistance.

[0041] In this embodiment, a flight device is provided, the flight device includes any of the multi-stage constant pressure variable regulating hydraulic systems in the above embodiments, and the flight device also includes a flight device body. The multi-stage constant pressure variable regulating hydraulic system is detachably connected to the flight device body. Through the multi-stage constant pressure variable regulating hydraulic system, the hydraulic actuator on the flight device can apply different pressure values ​​to perform actions under different working conditions, thereby reducing energy consumption while meeting the mechanism startup load.

[0042] In this embodiment, a multi-stage constant pressure variable regulation method for a hydraulic system of a flight device is provided. The multi-stage constant pressure variable regulation method for a hydraulic system of a flight device is applied to the flight device in the above embodiment, such as Figure 1 As shown, the multi-stage constant pressure variable adjustment method of the hydraulic system of the flight equipment may include steps S10 to S30, and each step is described in detail as follows: Step S10, based on the fact that the flight equipment is in working state, the working state type of the flight equipment is obtained. The working state type may include a plateau starting state and a maneuvering state; in the plateau starting state, due to the thin air, the starting load required by the hydraulic mechanism on the flight equipment is small; in the maneuvering state, each mechanism is in motion, and the starting load required is large.

[0043] Step S20, based on the flight equipment being in the plateau start-up 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, and 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, so that 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, and the oil can push the second valve core unit 32 to slide in the direction of the first valve core unit 31, and then push 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 opening pressure of the constant pressure variable oil hole 22 can be reduced by using the second valve core unit 32 to open the constant pressure variable oil hole 22, that is, the rated pressure of the hydraulic pump 41 in this state is lower.

[0044] Step S30, based on the flight equipment 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.

[0045] 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, and the pressure regulating unit 61 is detachably connected to the hydraulic pump 41. A limited position chamber 64 is arranged inside the pressure regulating unit 61, and one end of the first mounting unit 12 is slidably arranged in the limited position chamber 64. The control valve assembly 50 controls the limited position chamber 64 to switch and connect 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 limited position chamber 64 is connected to the oil outlet 42 of the hydraulic pump 41, the first mounting unit 12 approaches the direction of 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 direction of the elastic unit 11, the elastic unit 11 stretches, and the preload force decreases. By controlling the limit 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.

[0046] 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 reduction.

[0047] Step S20 also includes, based on the flight equipment being in a plateau start-up 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, the minimum rated pressure of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0048] 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 maximum rated pressure of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0049] The multi-stage constant pressure variable regulation method of the flight equipment hydraulic system also includes: 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 an appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0050] Step S50, based on the flight equipment being 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 relatively large, which can maintain an appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0051] In this embodiment, the multi-stage constant pressure variable regulating hydraulic system also 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 arranged inside the pressure regulating unit 61; one end of the first mounting unit 12 is slidably arranged in 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, 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 direction of 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 direction of the elastic unit 11, the elastic unit 11 stretches, and the preload force decreases. By controlling the limit 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.

[0052] 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 reduction.

[0053] Step S20 also includes, based on the flight equipment being in a plateau start-up 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, the minimum rated pressure of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0054] 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 maximum rated pressure of the hydraulic pump 41 in the four-stage constant pressure variable regulation can be achieved.

[0055] The multi-stage constant pressure variable regulation method of the flight equipment hydraulic system also includes: Step S60, 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 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 maintain appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0056] Step S70, based on the flight equipment being 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 an appropriate pressure to maintain the flight attitude and reduce energy consumption.

[0057] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and 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 comprises: 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 provided on the outer wall of the valve sleeve unit; a first channel, a first accommodating chamber, a second channel and a second accommodating chamber are provided inside the valve sleeve unit and are connected in sequence; the constant pressure variable oil hole is connected to the first channel; A valve core assembly, the valve core assembly comprising a first valve core unit and a second valve core unit; the first valve core unit is slidably arranged in the first channel; the second valve core unit is slidably 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; the first valve core unit can open the constant-pressure variable oil hole and communicate with the first accommodating chamber when it moves toward the elastic assembly; the first valve core unit can block the constant-pressure variable oil hole from communicating with the first accommodating chamber when it moves away from the elastic assembly; A hydraulic pump assembly, the hydraulic pump assembly comprising a hydraulic pump; the hydraulic pump has an oil outlet and an oil return port; the oil outlet of the hydraulic pump is communicated with the first accommodating chamber; the first mounting unit is 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 component 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 formed at one end of the second limiting part, and a sliding through hole is formed 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 1, 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 limit chamber is communicated with the oil outlet of the hydraulic pump; when the first reversing valve is in the second working position, the limit 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. A multi-stage constant pressure variable regulation hydraulic system according to claim 1, characterized in that: The valve sleeve unit comprises 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 comprises a first sub-channel and a second sub-channel; the first valve sleeve is formed with the first channel at one end and the first sub-channel at the other end; the first accommodating chamber is arranged inside the first valve sleeve; the second sub-channel is formed at one end of the second valve sleeve; the second accommodating chamber is arranged 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 oil return port of the hydraulic pump.

7. A flying device, characterized in that: The flight equipment includes: A multi-stage constant pressure variable regulating hydraulic system as claimed in any one of claims 1 to 6; The flight equipment body; the multi-stage constant pressure variable regulating hydraulic system is detachably connected to the flight equipment body.

8. A multi-stage constant pressure variable regulation method for a hydraulic system of a flight device, applied to the flight device of 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 flight equipment is in a working state, obtaining the working state type of the flight equipment; the working state type includes a plateau start 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 method for adjusting a multi-stage constant pressure variable of a hydraulic system of a flight equipment according to claim 8, characterized in that: The multi-stage constant pressure variable regulation hydraulic system further comprises a pressure regulating assembly; the pressure regulating assembly comprises a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position chamber is arranged inside the pressure regulating unit; one end of the first mounting unit is slidably arranged in the limited position chamber; the control valve assembly controls the switching communication between the limited position chamber and the oil outlet and the oil 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 device 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 of the flight equipment hydraulic system also 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 chamber with the oil outlet of the hydraulic pump; Step S50, based on the flight equipment being in the cruising 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 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 comprises a pressure regulating assembly; the pressure regulating assembly comprises a pressure regulating unit; the pressure regulating unit is detachably connected to the hydraulic pump; a limited position chamber is arranged inside the pressure regulating unit; one end of the first mounting unit is slidably arranged in the limited position chamber; the control valve assembly controls the switching communication between the limited position chamber and the oil outlet and the oil 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 device 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 of the flight equipment hydraulic system also 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 chamber with the oil return port of the hydraulic pump; Step S70, based on the flight equipment being in the cruising 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 chamber with the oil outlet of the hydraulic pump.

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