Integrated electro-hydrostatic actuating device

Abstract

The invention relates to an integrated electro-hydrostatic actuating device which comprises a motor, a two-way plunger pump, an oil tank, a first balance valve, a second balance valve, an integrated valve block, an actuating cylinder and a pressurizing mechanism. The two-way plunger pump is provided with a first pump connecting port, a second pump connecting port and a pump connecting oil return port; a plunger of a piston rod in the actuating cylinder divides the oil cylinder into a first hydraulic cavity and a second hydraulic cavity; a second interface of the first balance valve is connected with the first hydraulic cavity; an oil return port of the pump is connected with a C port of the pump; a D port of the pump is connected with an access port of the pressurizing mechanism; and an E port of the pump is connected with a second port of the pump and a first interface of the second balance valve through pipelines, and a second interface of the second balance valve is connected with the second hydraulic cavity through pipelines. Therefore, the problems that an existing conventional valve control actuator is large in oil source power size, wide in pipeline distribution, large in occupied space and the like are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of actuators, and in particular to an integrated electric hydrostatic actuating device. Background Art

[0002] Aircraft actuation systems are important systems in the aviation field, and actuation technology is a key technology for aircraft control and driving. Traditional aircraft actuation systems generally use hydraulic transmission, which requires a large central hydraulic system and hydraulic pipelines throughout the fuselage to achieve power transmission. Mechanical actuation is achieved locally on the aircraft by adjusting the pressure of hydraulic oil through valves to drive the actuating parts. However, with the development of technology and the improvement of actuation performance requirements, some problems of traditional hydraulic transmission systems have gradually been exposed: (1) In order to transmit power to various parts of the aircraft, the actuation system requires a central hydraulic system including a main oil pump, an emergency oil pump and an accumulator, as well as pipelines throughout the fuselage to transmit oil pressure. These components occupy a large volume and mass on the aircraft, affecting the aircraft's performance potential.

[0003] (2) The machine body is full of hydraulic pipelines, which increases the complexity of the machine body design. Since most of the hydraulic components work in closed housings and pipelines, it is not convenient to directly observe and inspect, and it is difficult to find faults in time, and the maintainability is poor.

[0004] (3) There are many factors that cause failures in the hydraulic system itself. For example, when air is sucked into the oil pump and mixed into the hydraulic oil to form bubbles, the so-called "cavitation phenomenon" is very likely to occur, causing strong impact and vibration. After the metal parts in the hydraulic system are subjected to the oxidation of oxygen in the bubbles and hydraulic shock for a long time, the surface will be corroded, which is usually called "cavitation", which seriously affects its working reliability and service life.

[0005] The existence of the above problems restricts the further application of traditional hydraulic systems in the field of airborne actuation. Instead, aircraft actuation systems using power-by-wire (PBW) technology are used. As the name suggests, power-by-wire refers to the use of cables to transmit power energy in the form of electricity. An important advancement of the use of power-by-wire actuation systems on aircraft is that the central hydraulic source and a large number of hydraulic pipelines are eliminated, thereby greatly improving reliability, maintainability and transmission efficiency and greatly enhancing the overall performance of the aircraft.

[0006] The electro-hydrostatic actuator (EHA) is the most representative power-by-wire actuation system. Different from the traditional hydraulic system, the EHA controls the speed of the motor by controlling the electrical signal and directly drives the pump, thereby controlling the pressure and flow of the pump output, and realizing the actuation process of accurately controlling the displacement of the actuating component. As an airborne actuation system, the EHA has the advantages of high actuation stability and fast actuation adjustment response of the traditional hydraulic system, and effectively reduces the volume and mass, realizes modularization and distribution, and improves the reliability and maintainability of the actuation system. In addition, the electro-hydrostatic actuator can not only be used in the aerospace field, but also has broad prospects for promotion to the civilian field as the technology develops and matures.

[0007] In the prior art, conventional valve-controlled actuators generally have a large size and mass; the steering gear system has many parts and components, which are scattered in layout, have a high failure rate, and are difficult to maintain; the high-pressure oil is transmitted over long distances, resulting in large energy losses and low system efficiency; the oil source power volume is large, the pipelines are widely distributed, and they take up a large space. Summary of the invention

[0008] In order to solve the problems of existing conventional valve-controlled actuators, such as large oil source power volume, wide pipeline distribution, and large space occupation, the present invention provides an integrated electric hydrostatic actuating device.

[0009] In a first aspect, the present invention provides an integrated electric hydrostatic actuating device, comprising: a motor, a bidirectional piston pump, an oil tank, a first balancing valve, a second balancing valve, an integrated valve block, an actuating cylinder and a booster mechanism, wherein the bidirectional piston pump has a pump connection port 1, a pump connection port 2 and a pump connection oil return port, the integrated valve block has ports A, B, C, D and E, the actuating cylinder has a cylinder and a piston rod inside, the piston rod of the piston rod separates the cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other, the pump connection port 1 is connected to the port B through a pipeline, the A port is connected to the first interface of the first balancing valve through a pipeline, the second interface of the first balancing valve is connected to the first hydraulic chamber through a pipeline, the pump connection oil return port is connected to the C port through a pipeline, the D port is connected to the inlet of the booster mechanism through a pipeline, the E port is connected to the pump connection port 2 and the first interface of the second balancing valve through a pipeline respectively, and the second interface of the second balancing valve is connected to the second hydraulic chamber through a pipeline; The motor drives the bidirectional plunger pump to suck oil from the oil tank and output high-pressure oil, and the output high-pressure oil flows to the first hydraulic chamber through the pump connection port 1, pushing the piston rod to move, and the oil in the second hydraulic chamber is pressed back to the E port through the second balance valve, and flows into the oil tank through the pump connection port 2; or, the output high-pressure oil flows to the second hydraulic chamber through the pump connection port 2, pushing the piston rod to move, and the oil in the first hydraulic chamber is pressed back to the A port through the first balance valve, and flows into the oil tank through the pump connection port 1; Wherein, the integrated valve block adopts an integrated structure.

[0010] In some embodiments, the integrated valve block has a first high-pressure safety valve, a second high-pressure safety valve, a first one-way valve, a second one-way valve and a third one-way valve, the input end of the first high-pressure safety valve is connected to the A port, the A port is connected to the B port, the output end of the first high-pressure safety valve is connected to the E port, the input end of the second high-pressure safety valve is connected to the E port, the output end of the second high-pressure safety valve is connected to the A port, the input end of the first one-way valve is connected to the port of the integrated valve block, the output end of the first one-way valve is connected to the B port, the input end of the second one-way valve is connected to the C port, the output end of the second one-way valve is connected to the port of the integrated valve block, the input end of the third one-way valve is connected to the port of the integrated valve block, the output end of the third one-way valve is connected to the E port, and the port of the integrated valve block is connected to the D port.

[0011] In some embodiments, the integrated valve block further has a fourth one-way valve, a fifth one-way valve and an oil filter, the input end of the fourth one-way valve is connected to the B port, the output end of the fourth one-way valve is connected to the A port and the input end of the fifth one-way valve respectively, the output end of the fifth one-way valve is connected to the input end of the oil filter, and the output end of the oil filter is connected to the output end of the first one-way valve.

[0012] In some embodiments, the boosting mechanism has a boosting oil tank, a low-pressure safety valve and a first filling valve, the output end of the first filling valve is respectively connected to the input end of the low-pressure safety valve and the inlet of the boosting mechanism, the output end of the low-pressure safety valve is connected to the input end of the boosting oil tank, and the output end of the boosting oil tank is connected to the inlet of the boosting mechanism.

[0013] In some embodiments, the boost mechanism further comprises a first pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are both disposed at an access port of the boost mechanism.

[0014] In some embodiments, the first balancing valve includes a sixth one-way valve and a third high-pressure safety valve, the input end of the sixth one-way valve is connected to the first interface of the first balancing valve, the output end of the sixth one-way valve is connected to the second interface of the first balancing valve, the input end of the third high-pressure safety valve is connected to the second interface of the first balancing valve, and the output end of the third high-pressure safety valve is connected to the first interface of the first balancing valve.

[0015] In some embodiments, the second balancing valve includes a seventh one-way valve and a fourth high-pressure safety valve, the input end of the seventh one-way valve is connected to the first interface of the second balancing valve, the output end of the seventh one-way valve is connected to the second interface of the second balancing valve, the input end of the fourth high-pressure safety valve is connected to the second interface of the second balancing valve, and the output end of the fourth high-pressure safety valve is connected to the first interface of the second balancing valve.

[0016] In some embodiments, a second filling valve and a third filling valve are further included, wherein the output end of the second filling valve is connected to the A port, and the output end of the third filling valve is connected to the C port.

[0017] In some embodiments, a feedback potentiometer, a second pressure sensor and a third pressure sensor are also included. The feedback potentiometer is embedded in the piston rod, the second pressure sensor is arranged at the second interface of the first balancing valve, and the third pressure sensor is arranged at the second interface of the first balancing valve.

[0018] In order to solve the problems of the existing conventional valve-controlled actuators, such as large oil source power volume, wide pipeline distribution, and large space occupation, the present invention has the following advantages: Through the technical solution of the present invention, the integrated valve block is used to adopt an integrated structure, which can reduce the system mass and space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the hydraulic principle of the integrated electric hydrostatic actuator is shown; Figure 2 Shows Figure 1 Schematic diagram of hydraulic principle after the integrated valve block is integrated as shown in; Figure 3 Shows Figure 1 Schematic diagram of the hydraulic principle of the integrated electric hydrostatic actuator excluding the integrated valve block.

[0020] Figure markings: 1-motor; 2-bidirectional plunger pump; 3-integrated valve block; 31-first one-way valve; 32-second one-way valve; 33-third one-way valve; 34-fourth one-way valve; 35-fifth one-way valve; 36-oil filter; 37-first high-pressure safety valve; 38-second high-pressure safety valve; 39-port of integrated valve block; 41-boosting oil tank; 42-low-pressure safety valve; 43-first pressure sensor; 44-temperature sensor; 45-first filling valve; 46-access port of boosting mechanism; 51-second pressure sensor; 52-third pressure sensor; 61-second filling valve; 62-third filling valve; 7-first balancing valve; 71-sixth one-way valve; 72-third high-pressure safety valve; 8-second balancing valve; 81-seventh one-way valve; 82-fourth high-pressure safety valve; 9-bypass valve; 10-actuator; 11-feedback potentiometer. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] See also Figures 1 to 3As shown, this embodiment discloses an integrated electric hydrostatic actuating device, including: a motor 1, a bidirectional plunger pump 2, an oil tank, a first balancing valve 7, a second balancing valve 8, an integrated valve block 3, an actuating cylinder 10 and a booster mechanism, wherein the bidirectional plunger pump 2 has a pump 1 port, a pump 2 port and a pump return port, the integrated valve block 3 has an A port, a B port, a C port, a D port and an E port, the actuating cylinder 10 has an oil cylinder and a piston rod inside, the piston rod of the piston rod divides the oil cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other, The pump connection port 1 is connected to the B port through a pipeline, the A port is connected to the first interface of the first balancing valve 7 through a pipeline, the second interface of the first balancing valve 7 is connected to the first hydraulic chamber through a pipeline, the pump connection oil return port is connected to the C port through a pipeline, the D port is connected to the inlet 46 of the boosting mechanism through a pipeline, the E port is respectively connected to the pump connection port 2 and the first interface of the second balancing valve 8 through pipelines, and the second interface of the second balancing valve 8 is connected to the second hydraulic chamber through a pipeline; The motor 1 drives the bidirectional piston pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil flows to the first hydraulic chamber through the pump port 1 to push the piston rod to move. The oil in the second hydraulic chamber is pressed back to the E port through the second balance valve 8 and flows into the oil tank through the pump port 2; or, the output high-pressure oil flows to the second hydraulic chamber through the pump port 2 to push the piston rod to move. The oil in the first hydraulic chamber is pressed back to the A port through the first balance valve 7 and flows into the oil tank through the pump port 1; Wherein, the integrated valve block 3 adopts an integrated structure.

[0024] In this embodiment, the present invention provides an integrated electric hydrostatic actuating device, including a motor pump assembly, an actuating cylinder assembly, and an integrated valve block 3. The three main components are connected by bolts to form the actuating device.

[0025] Specifically, the motor pump combination includes a motor 1, a pump housing, and a bidirectional quantitative pump. The motor pump combination is connected to the actuator assembly by bolts. The oil in the system can pass through the pump 1 port and the pump 2 port by the forward and reverse rotation of the motor 1, and the oil leaked from the system can flow back to the oil tank through the pump return port. Among them, the pump 1 port, the pump 2 port, and the pump return port of the motor pump combination are connected with the pump 1 port, the pump 2 port, and the pump return port of the actuator assembly by bolt connection, so as to ensure that the bidirectional quantitative pump can continuously supply high-pressure oil to the system.

[0026] Specifically, three pipelines are arranged in the shell of the actuator assembly, one end of the three pipelines are respectively connected to the pump 1 port, the pump 2 port and the pump oil return port, and the other ends of the three pipelines are respectively connected to the B port, the E port and the C port on the integrated valve block 3, so that the motor 1 drives the bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil flows into the integrated valve block 3 through the pump 1 port or the pump 2 port, and is supplied to the first hydraulic chamber or the second hydraulic chamber in the actuator 10 through the A port or the E port of the integrated valve block 3, so that it pushes the piston rod to move.

[0027] Specifically, Figure 3 As shown, two oil circuits are formed in the integrated electric hydrostatic actuating device disclosed in the present application, wherein the first oil circuit is the forward rotation of the motor 1, so that the motor 1 drives the bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil, and the output high-pressure oil is supplied to the B port through the pump 1 port, and flows out from the A port, and then flows into the first interface of the first balancing valve 7, and flows out from the second interface of the first balancing valve 7 until it reaches the first hydraulic chamber, so that the pressure in the first hydraulic chamber increases, and then the piston rod is pushed to move toward the side where the second hydraulic chamber is located. At this time, since the piston rod moves toward the side where the second hydraulic chamber is located, the space of the second hydraulic chamber will be reduced, and then when the piston rod moves toward the side where the second hydraulic chamber is located, it will push the oil in the second hydraulic chamber to move toward the side where the second interface of the second balancing valve 8 is located, thereby causing the pressure in this area to increase, thereby forcing the high-pressure safety valve in the second balancing valve 8 to open, thereby causing the oil to flow to the E port through the first interface of the second balancing valve 8, and flow into the oil tank through the pump 2 port. Similarly, the second oil circuit is the reverse rotation of motor 1, so that motor 1 drives bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil is supplied to port E through port 2 of pump 2, and flows into the first interface of second balancing valve 8 from port E, and flows out from the second interface of second balancing valve 8 until it reaches the second hydraulic chamber, so that the pressure in the second hydraulic chamber increases, thereby pushing the piston rod to move toward the side where the first hydraulic chamber is located. At this time, since the piston rod moves toward the side where the first hydraulic chamber is located, the space of the first hydraulic chamber will be reduced, and then when the piston rod moves toward the side where the first hydraulic chamber is located, it will push the oil in the first hydraulic chamber to move toward the side where the second interface of the first balancing valve 7 is located, thereby increasing the pressure in this area, thereby forcing the high-pressure safety valve in the first balancing valve 7 to open, thereby causing the oil to flow to port A through the first interface of the first balancing valve 7, and flow to port 2 of pump 2 through port B of integrated valve block 3 and flow into the oil tank.

[0028] Specifically, the bidirectional quantitative pump is connected to the motor 1 by bolts to ensure that the motor 1 can provide continuous power to the bidirectional quantitative pump, ensure that the bidirectional quantitative pump can achieve forward and reverse rotation, and the bidirectional quantitative pump provides high-pressure oil to the system through oil suction and oil discharge. In this application, the pump housing is connected to the motor 1 by bolts, and the bidirectional quantitative pump is embedded in the pump housing to ensure that the high-pressure oil and low-pressure oil of the bidirectional quantitative pump can enter the actuator assembly.

[0029] In some embodiments, the integrated valve block 3 has a first high-pressure safety valve 37, a second high-pressure safety valve 38, a first one-way valve 31, a second one-way valve 32 and a third one-way valve 33, the input end of the first high-pressure safety valve 37 is connected to the A port, the A port is connected to the B port, the output end of the first high-pressure safety valve 37 is connected to the E port, the input end of the second high-pressure safety valve 38 is connected to the E port, the output end of the second high-pressure safety valve 38 is connected to the A port, the input end of the first one-way valve 31 is connected to the port 39 of the integrated valve block, the output end of the first one-way valve 31 is connected to the B port, the input end of the second one-way valve 32 is connected to the C port, the output end of the second one-way valve 32 is connected to the port 39 of the integrated valve block, the input end of the third one-way valve 33 is connected to the port 39 of the integrated valve block, the output end of the third one-way valve 33 is connected to the E port, and the port 39 of the integrated valve block is connected to the D port.

[0030] Furthermore, the integrated valve block 3 also has a fourth one-way valve 34, a fifth one-way valve 35 and an oil filter 36, the input end of the fourth one-way valve 34 is connected to the B port, the output end of the fourth one-way valve 34 is connected to the A port and the input end of the fifth one-way valve 35 respectively, the output end of the fifth one-way valve 35 is connected to the input end of the oil filter 36, and the output end of the oil filter 36 is connected to the output end of the first one-way valve 31.

[0031] In the present embodiment, the integrated valve block 3 includes two high-pressure safety valves (i.e., the first high-pressure safety valve 37 and the second high-pressure safety valve 38), five one-way valves (i.e., the first one-way valve 31, the second one-way valve 32, the third one-way valve 33, the fourth one-way valve 34 and the fifth one-way valve 35), an oil filter 36 and an integrated valve housing. Among them, an integrated valve housing is integrated in the integrated valve block 3 by plug-in method, and the two high-pressure safety valves, the five one-way valves and the oil filter 36 are all integrated in the integrated valve housing, so that the surface of the integrated valve housing is formed with ports A, B, C, D and E connected to the internal oil circuit of the integrated valve block 3. In the present application, the integrated valve block 3 is connected to the actuator assembly through the integrated valve housing by bolts, so as to realize the high-pressure protection of the system components, oil filtration, and one-way circulation. In the prior art, due to the large number and variety of hydraulic components in the hydraulic circuit and the relatively complex oil circuit, it is difficult to achieve a completely integrated structural design. Therefore, by Figure 1 By analyzing the hydraulic circuit in the integrated valve block 3, the flow distribution circuit, the filtration circuit and the safety protection circuit composed of five one-way valves, two high-pressure safety valves and the oil filter 36 can be extracted to form the hydraulic circuit of the integrated valve block 3. Figure 2 . Figure 2 The A~E ports are the oil circuit interfaces between the integrated valve block 3 and the actuator assembly, and can be connected to the corresponding interfaces on the housing of the actuator assembly in the form of end-face butt sealing.

[0032] Furthermore, the first high-pressure safety valve 37 and the second high-pressure safety valve 38 are embedded in the integrated valve housing and communicated with the entire system oil circuit, thereby protecting the components of the entire system.

[0033] Furthermore, the first one-way valve 31, the second one-way valve 32, the third one-way valve 33, the fourth one-way valve 34 and the fifth one-way valve 35 are installed inside the integrated valve housing to control the one-way flow of the hydraulic oil and prevent the hydraulic oil from flowing back.

[0034] Furthermore, the oil filter 36 is embedded in the integrated valve housing to ensure that large particles of impurities cannot enter the interior of the precision components, thereby preventing the precision components from being damaged after large particles enter the components.

[0035] In some embodiments, the boosting mechanism has a boosting oil tank 41, a low-pressure safety valve 42 and a first filling valve 45, the output end of the first filling valve 45 is respectively connected to the input end of the low-pressure safety valve 42 and the inlet 46 of the boosting mechanism, the output end of the low-pressure safety valve 42 is connected to the input end of the boosting oil tank 41, and the output end of the boosting oil tank 41 is connected to the inlet 46 of the boosting mechanism.

[0036] Furthermore, the boost mechanism also has a first pressure sensor 43 and a temperature sensor 44 , and the pressure sensor and the temperature sensor 44 are both arranged at the inlet 46 of the boost mechanism.

[0037] Furthermore, the first balancing valve 7 includes a sixth one-way valve 71 and a third high-pressure safety valve 72, the input end of the sixth one-way valve 71 is connected to the first interface of the first balancing valve 7, the output end of the sixth one-way valve 71 is connected to the second interface of the first balancing valve 7, the input end of the third high-pressure safety valve 72 is connected to the second interface of the first balancing valve 7, and the output end of the third high-pressure safety valve 72 is connected to the first interface of the first balancing valve 7.

[0038] Furthermore, the second balancing valve 8 includes a seventh one-way valve 81 and a fourth high-pressure safety valve 82, the input end of the seventh one-way valve 81 is connected to the first interface of the second balancing valve 8, the output end of the seventh one-way valve 81 is connected to the second interface of the second balancing valve 8, the input end of the fourth high-pressure safety valve 82 is connected to the second interface of the second balancing valve 8, and the output end of the fourth high-pressure safety valve 82 is connected to the first interface of the second balancing valve 8.

[0039] Furthermore, it also includes a second filling valve 61 and a third filling valve 62, wherein the output end of the second filling valve 61 is connected to the A port, and the output end of the third filling valve 62 is connected to the C port.

[0040] Furthermore, it also includes: a feedback potentiometer 11, a second pressure sensor 51 and a third pressure sensor 52, the feedback potentiometer 11 is embedded in the piston rod, the second pressure sensor 51 is arranged at the second interface of the first balancing valve 7, and the third pressure sensor 52 is arranged at the second interface of the first balancing valve 7.

[0041] In this embodiment, the actuator assembly includes a housing, in which are installed: an actuator 10, a bypass valve 9, a filling valve, a pressure sensor, a balance valve, a boost oil tank 41, a feedback potentiometer 11 and a plurality of pressure sensors. Among them, the actuator 10 has a cylinder and a piston rod inside, and the piston rod of the piston rod divides the cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other. In this application, the cylinder and the boost oil tank 41 inside the actuator 10 adopt an integrated design to share a housing, and the balance valve (i.e., the first balance valve 7 and the second balance valve 8) and the pressure sensor are installed on the housing in a plug-in manner; the feedback potentiometer 11 is embedded and installed inside the piston rod in a coaxial manner with the piston rod, which effectively shortens the length direction of the actuator 10; the signal cables of the pressure sensor and the feedback potentiometer 11 are connected to the wiring box inside the housing through the wire hole on the housing, and are centrally connected to the electrical connection socket fixed on the housing, without externally thrown cables.

[0042] Furthermore, the oil cylinder is embedded inside the housing, and the extension and retraction of the piston rod is achieved by changing the oil in the two chambers of the oil cylinder (ie, the first hydraulic chamber and the second hydraulic chamber).

[0043] Furthermore, the bypass valve 9 is installed in an embedded form inside the shell. The bypass valve 9 is mainly used for connecting the two chambers of the oil cylinder. When the integrated electric hydrostatic actuating device fails or the actuating device is filled with oil, the bypass valve 9 is used to switch to the two-chamber connection state.

[0044] Furthermore, the embedded feedback potentiometer 11 is installed inside the piston rod, and the extended and retracted positions of the piston rod can be detected by the embedded feedback potentiometer 11 .

[0045] Furthermore, two balancing valves can be fixed to the housing by inserting and installing, and are mainly used to lock the two chambers of the oil cylinder and help maintain the position of the piston rod; Furthermore, the function of the boost oil tank 41 is to establish the return oil pressure of the closed system to avoid the situation where the return oil pressure is too low after the pressure is established in the load chamber of the integrated electric hydrostatic actuator, resulting in the plunger pump being sucked empty.

[0046] Furthermore, the filling valve is mounted on the housing by two screws to realize the oil filling and oil draining functions of the integrated electric hydrostatic actuator.

[0047] Furthermore, a pressure sensor is embedded in the housing to collect the pressure of the internal oil circuit of the integrated electric hydrostatic actuator in real time.

[0048] In this embodiment, the working principle of the integrated electric hydrostatic actuator is as follows: the controller receives the control instruction from the upper computer, and after the three-loop closed-loop control of the position loop, speed loop and current loop, it outputs the PWM signal through pulse width modulation, drives the power module to control the power switch of the inverter to produce different combination states, and outputs a controllable sinusoidal voltage to drive the motor 1 to rotate, driving the bidirectional hydraulic variable pump to rotate, generating flow and pressure in the output chamber of the pump, which is transmitted to the actuator cylinder 10 through the integrated hydraulic oil circuit, pushing the piston of the actuator cylinder 10 to produce linear motion. Among them, the controller has a power module, a communication module, and a control module, that is, a drive module. The controller realizes the control of the forward and reverse rotation of the motor 1 through the mutual cooperation between several internal modules. In this application, the controller is a prior art, and this application does not describe it in detail.

[0049] Specifically, by controlling the forward and reverse rotation of the motor 1, the bidirectional quantitative pump is driven to rotate, and flow and pressure are generated in the output chamber of the bidirectional quantitative pump, which are transmitted to the cylinder through the integrated hydraulic oil circuit, pushing the piston rod to produce linear motion. During the whole process, the integrated valve block 3 adopts an integrated structural design, and the distribution circuit, filtration circuit and safety protection circuit composed of five one-way valves, two high-pressure safety valves and oil filter 36 are extracted to form an integrated hydraulic circuit, which can be used alone in the hydraulic circuit.

[0050] Specifically, the main function of motor 1 is to realize the conversion of electrical energy into mechanical energy and drive the bidirectional quantitative pump to rotate forward and reverse; the bidirectional quantitative pump is the core component of the actuator, and its main function is to generate output flow according to the forward and reverse rotation of motor 1 to drive the piston rod to move; the function of the booster oil tank 41 is to establish the return oil pressure of the closed system to avoid the bidirectional quantitative pump from sucking air due to the low return oil pressure caused by the pressure established in the load chamber of the actuator; a plurality of small-flow one-way valves (i.e., the first one-way valve 31, the second one-way valve 32 and the third one-way valve 33) and a large-flow one-way valve (i.e., the fourth one-way valve 34 and the fifth one-way valve 35) are combined to form a pump low-pressure chamber oil replenishment circuit, a hydraulic oil filtration circuit and realize the oil flow configuration; two high-pressure safety valves An overload protection circuit is provided; two balancing valves are used to lock the two chambers of the oil cylinder to help maintain the position of the oil cylinder; the bypass valve 9 is mainly used to connect the two chambers of the oil cylinder. When the integrated electric hydrostatic actuator fails or the actuator is filled with oil, the bypass valve 9 is used to switch to the two-chamber connection state; the oil filter 36 and the one-way valve form a filter circuit to filter out pollutants in the actuator hydraulic system; the piston rod is the output component of the mechanism, and the piston rod outputs the required thrust and linear velocity through the action of hydraulic oil; the pressure sensor is mainly used to measure the working pressure of the load chamber and the low-pressure chamber in real time, and can also provide dynamic pressure feedback according to the system control requirements; the embedded feedback potentiometer 11 provides position feedback for the system; the filling valve is used to pump and fill oil in the hydraulic system.

[0051] In summary, through the above structural setting, the integrated valve block adopts an integrated structural setting, which can reduce the system mass and space; Through the above structural setting, most components can be plug-in assembled, so that the system has fewer components.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0053] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. An integrated electric hydrostatic actuating device, characterized in that: include: A motor, a bidirectional piston pump, an oil tank, a first balancing valve, a second balancing valve, an integrated valve block, an actuator and a booster mechanism, wherein the bidirectional piston pump has a pump connection port 1, a pump connection port 2 and a pump connection oil return port, the integrated valve block has ports A, B, C, D and E, an oil cylinder and a piston rod are provided inside the actuator, the piston rod of the piston rod separates the oil cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other, the pump connection port 1 is connected to the port B through a pipeline, the A port is connected to the first interface of the first balancing valve through a pipeline, the second interface of the first balancing valve is connected to the first hydraulic chamber through a pipeline, the pump connection oil return port is connected to the C port through a pipeline, the D port is connected to the inlet of the booster mechanism through a pipeline, the E port is connected to the pump connection port 2 and the first interface of the second balancing valve through pipelines respectively, and the second interface of the second balancing valve is connected to the second hydraulic chamber through a pipeline; The motor drives the bidirectional plunger pump to suck oil from the oil tank and output high-pressure oil, and the output high-pressure oil flows to the first hydraulic chamber through the pump connection port 1, pushing the piston rod to move, and the oil in the second hydraulic chamber is pressed back to the E port through the second balance valve, and flows into the oil tank through the pump connection port 2; or, the output high-pressure oil flows to the second hydraulic chamber through the pump connection port 2, pushing the piston rod to move, and the oil in the first hydraulic chamber is pressed back to the A port through the first balance valve, and flows into the oil tank through the pump connection port 1; Wherein, the integrated valve block adopts an integrated structure.

2. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The integrated valve block comprises a first high-pressure safety valve, a second high-pressure safety valve, a first check valve, a second check valve and a third check valve, the input end of the first high-pressure safety valve is communicated with the A port, the A port is communicated with the B port, the output end of the first high-pressure safety valve is communicated with the E port, the input end of the second high-pressure safety valve is communicated with the E port, the output end of the second high-pressure safety valve is communicated with the A port, the input end of the first check valve is communicated with the port of the integrated valve block, the output end of the first check valve is communicated with the B port, the input end of the second check valve is communicated with the C port, the output end of the second check valve is communicated with the port of the integrated valve block, the input end of the third check valve is communicated with the port of the integrated valve block, the output end of the third check valve is communicated with the E port, and the port of the integrated valve block is communicated with the D port.

3. The integrated electric hydrostatic actuating device according to claim 2, characterized in that: The integrated valve block also has a fourth one-way valve, a fifth one-way valve and an oil filter. The input end of the fourth one-way valve is connected to the B port, the output end of the fourth one-way valve is connected to the A port and the input end of the fifth one-way valve respectively, the output end of the fifth one-way valve is connected to the input end of the oil filter, and the output end of the oil filter is connected to the output end of the first one-way valve.

4. The integrated electric hydrostatic actuating device according to claim 1, 2 or 3, characterized in that: The boosting mechanism comprises a boosting oil tank, a low-pressure safety valve and a first filling valve, the output end of the first filling valve is respectively connected to the input end of the low-pressure safety valve and the inlet of the boosting mechanism, the output end of the low-pressure safety valve is connected to the input end of the boosting oil tank, and the output end of the boosting oil tank is connected to the inlet of the boosting mechanism.

5. The integrated electric hydrostatic actuating device according to claim 4, characterized in that: The boost mechanism further comprises a first pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are both arranged at the access port of the boost mechanism.

6. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The first balancing valve includes a sixth one-way valve and a third high-pressure safety valve, the input end of the sixth one-way valve is connected to the first interface of the first balancing valve, the output end of the sixth one-way valve is connected to the second interface of the first balancing valve, the input end of the third high-pressure safety valve is connected to the second interface of the first balancing valve, and the output end of the third high-pressure safety valve is connected to the first interface of the first balancing valve.

7. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The second balancing valve includes a seventh one-way valve and a fourth high-pressure safety valve, the input end of the seventh one-way valve is connected to the first interface of the second balancing valve, the output end of the seventh one-way valve is connected to the second interface of the second balancing valve, the input end of the fourth high-pressure safety valve is connected to the second interface of the second balancing valve, and the output end of the fourth high-pressure safety valve is connected to the first interface of the second balancing valve.

8. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: It also includes a second filling valve and a third filling valve, wherein the output end of the second filling valve is connected to the A port, and the output end of the third filling valve is connected to the C port.

9. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: It also includes a feedback potentiometer, a second pressure sensor and a third pressure sensor. The feedback potentiometer is embedded in the piston rod, the second pressure sensor is arranged at the second interface of the first balancing valve, and the third pressure sensor is arranged at the second interface of the first balancing valve.

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