Energy recovery device, energy recovery system, hydraulic system and engineering machinery

Abstract

The invention relates to the technical field of energy recovery, and discloses an energy recovery device, an energy recovery system, a hydraulic system and engineering machine.The energy recovery device comprises a shell, an energy recovery liquid channel, a liquid inlet and a liquid outlet are formed in the shell, and the liquid inlet and the liquid outlet are both communicated with the energy recovery liquid channel; the rotating shaft is rotatably mounted on the shell; the fins are connected with the rotating shaft and located on the upstream of the liquid outlet, and the fins drive the rotating shaft to rotate around the axis of the rotating shaft under pushing of liquid flowing into the energy recovery liquid channel; the energy conversion unit comprises a conductor, a magnetic field piece and an output piece, the magnetic field piece is provided with a magnetic field, one of the conductor and the magnetic field piece is installed on the shell, the other one sleeves the rotating shaft, the output piece is connected with the conductor, the rotating shaft drives the conductor and the magnetic field piece to rotate relatively so that the conductor can cut the magnetic field to generate electricity, and the output piece is used for outputting electric energy. According to the energy recovery device, kinetic energy of hydraulic oil can be recycled, and the energy utilization rate is increased.

Description

Technical Field

[0001] This invention relates to the field of energy recovery technology, specifically to energy recovery devices, energy recovery systems, hydraulic systems, and engineering machinery. Background Technology

[0002] During the operation of construction machinery, hydraulic oil, as a flowing medium, plays a role in energy transfer. However, very little energy is utilized during the entire circulation process of the hydraulic oil, as the high-temperature hydraulic oil is cooled, collected in the hydraulic oil tank, filtered, and then recycled. Because hydraulic oil has a large return flow rate and stable pressure, its rational utilization can achieve energy regeneration and conservation.

[0003] In related technologies, the energy regeneration and utilization of hydraulic systems is mainly achieved by converting the gravitational potential energy of the boom into mechanical energy, the kinetic energy of the slewing brake into mechanical energy, and the heat energy of the return oil is stored and released through energy storage devices, conversion devices, and phase change materials. The conversion and utilization of the kinetic energy of the hydraulic oil return is relatively small. Summary of the Invention

[0004] This invention provides an energy recovery device, an energy recovery system, a hydraulic system, and engineering machinery to solve the problem of insufficient utilization of return oil kinetic energy in the prior art.

[0005] In a first aspect, the present invention provides an energy recovery device, comprising: a housing having an energy recovery liquid channel, an inlet, and an outlet, the inlet and the outlet both being connected to the energy recovery liquid channel; a rotating shaft rotatably mounted on the housing; fins connected to the rotating shaft and located upstream of the outlet, wherein the fins drive the rotating shaft to rotate around its axis under the pressure of liquid flowing into the energy recovery liquid channel; and an energy conversion unit comprising a conductor, a magnetic field component, and an output component, wherein the magnetic field component has a magnetic field, one of the conductor and the magnetic field component is mounted on the housing, and the other is sleeved on the rotating shaft, the output component is connected to the conductor, the rotating shaft drives the conductor and the magnetic field component to rotate relative to each other, so that the conductor cuts the magnetic field to generate electricity, and the output component is used to output electrical energy.

[0006] Beneficial effects: When the hydraulic oil flows back, it passes through the energy recovery channel. The hydraulic oil contacts the fins, causing them to rotate. The fins drive the shaft to rotate around its axis. The shaft then drives the conductor and magnetic field components to rotate relative to each other, causing the conductor to cut the magnetic field and generate electricity. The output component guides the generated electricity outwards. In this way, during the hydraulic oil return process, the energy recovery device achieves the sequential conversion between hydraulic energy, mechanical energy, and electrical energy, resulting in a high recovery and utilization rate of the returned oil energy.

[0007] In one optional embodiment, the fins are rotatably mounted on the rotating shaft, the axis of the liquid inlet is parallel to the axis of the rotating shaft, and the orthographic projection of the fins on a projection plane perpendicular to the axis of the rotating shaft is the fin projection; the energy recovery device further includes an angle adjustment unit, which is drivenly connected to the fins and is used to adjust the area of ​​the fin projection.

[0008] Beneficial effects: When the amount of liquid entering the energy recovery channel is reduced, the contact area between the fins and the hydraulic oil can be increased. When the amount of liquid entering the energy recovery channel is increased, the contact area between the fins and the hydraulic oil can be reduced. This can maintain the relative rotational speed between the conductor and the magnetic field component and reduce the fluctuation of various power generation parameters.

[0009] In one optional embodiment, the rotating shaft is provided with a receiving cavity, and the angle adjustment unit is movably disposed in the receiving cavity. The angle adjustment unit is hydraulically driven to move within the receiving cavity to adjust the area of ​​the fin projection. The energy recovery device further includes a control valve and a controller. The control valve is provided with a regulating liquid channel. One end of the regulating liquid channel is connected to the receiving cavity, and the other end of the regulating liquid channel is connected to an external hydraulic source. The controller is electrically connected to the control valve and is used to control the opening degree of the regulating liquid channel.

[0010] Beneficial effects: The controller can adjust the pressure applied by the hydraulic source to the angle adjustment unit, thereby controlling the movement of the angle adjustment unit in the receiving cavity to adjust the contact area between the fins and the hydraulic oil, thus effectively maintaining the relative speed stability between the conductor and the magnetic field component and reducing the fluctuation of various power generation parameters.

[0011] In one optional embodiment, the angle adjustment unit includes: a valve core movably disposed within the receiving cavity, wherein the valve core is hydraulically controlled to move within the receiving cavity; an adjustment rod connected to the fin; and an elastic element abutting between the valve core and the adjustment rod.

[0012] Beneficial effects: By utilizing the elastic element and the liquid in the receiving cavity, the valve core can be adjusted from opposite sides of the rotating shaft along the axial direction, effectively changing the pressure applied by the elastic element to the adjusting rod, thereby better matching the contact area between the fins and the hydraulic oil and the flow rate of the hydraulic oil.

[0013] In one optional embodiment, the energy recovery device further includes: a speed sensor installed in the housing, the speed sensor being used to detect the relative rotational speed of the conductor and the magnetic field component, the controller being electrically connected to the speed sensor, and the controller controlling the opening of the regulating fluid channel based on the feedback value of the speed sensor.

[0014] Beneficial effects: The controller controls the opening of the regulating fluid channel based on the detection feedback value of the speed sensor, thereby controlling the movement stroke of the valve core. This results in more precise control of the relative rotation speed of the conductor and magnetic field components, further reducing fluctuations in power generation parameters.

[0015] In one optional embodiment, the housing includes: a housing body having the energy recovery liquid channel, the liquid inlet, and the liquid outlet; an end cap connected to the housing body, forming an installation cavity between the end cap and the housing body, the conductor and the magnetic field component being installed in the installation cavity, and the output component passing through the end cap and connected to the conductor.

[0016] Beneficial effects: On the one hand, the housing can fix the relative position between the fins, the shaft and the energy conversion unit, improving the reliability of the transmission. On the other hand, since the conductor and magnetic field components are located in the mounting cavity, the housing can protect the conductor and magnetic field components, reducing the probability of damage to the conductor and magnetic field components.

[0017] In one alternative embodiment, the energy recovery device further includes a first bearing disposed between the rotating shaft and the housing body, in the axial direction of the rotating shaft, the first bearing being located on the side of the energy conversion unit facing the fins.

[0018] Beneficial effects: While fixing the relative position between the shaft and the housing body, the first bearing can reduce the friction between the shaft and the housing body, improve transmission efficiency, and stabilize the fins, preventing lateral force disturbances in the shaft and fins when the hydraulic oil flow changes, thus improving motion reliability.

[0019] In one optional embodiment, the energy recovery device further includes a second bearing disposed between the rotating shaft and the end cover, in the axial direction of the rotating shaft, the second bearing being located on the side of the energy conversion unit facing away from the fins.

[0020] Beneficial effects: While fixing the relative position between the shaft and the end cover, the second bearing can reduce the friction between the shaft and the end cover, further improving the positional stability of the shaft. In addition, the second bearing can stabilize the energy conversion unit and prevent the energy conversion unit from moving axially on the shaft when the rotation speed changes, thus ensuring energy conversion efficiency.

[0021] In one optional embodiment, the liquid inlet and the end cap are located at opposite ends of the shell body, and the liquid outlet is located on the side wall of the shell body.

[0022] Beneficial effects: It makes full use of the space of the shell body and shortens the flow time of the liquid in the energy recovery channel, thus improving the return efficiency.

[0023] Secondly, the present invention also provides an energy recovery system, comprising: a liquid return control unit, including a liquid return housing, a first pressure valve and a second pressure valve, wherein the liquid return housing is provided with a first channel and a second channel, the first pressure valve is disposed in the first channel, the second pressure valve is disposed in the second channel, and the opening pressure of the first pressure valve is less than the opening pressure of the second pressure valve; the energy recovery device, wherein the energy recovery liquid channel is connected to the second channel, and the first channel is adapted to be connected to a heat dissipation unit.

[0024] Beneficial effects: The energy recovery system utilizes the above-mentioned energy recovery device, which not only enables the recovery of hydraulic oil return energy, but also has a simple structure.

[0025] In one alternative implementation, the fins are located in the second channel and / or the energy recovery liquid channel.

[0026] Beneficial effects: The fins can fully contact the liquid to absorb the liquid's kinetic energy and improve energy recovery efficiency.

[0027] Thirdly, the present invention also provides a hydraulic system, comprising: a hydraulic pump; a hydraulic control unit having a first opening, a second opening, a third opening, and a fourth opening, the first opening being connected to the hydraulic pump; an execution unit having a rodless chamber and a rod chamber, the rodless chamber being connected to the second opening, and the rod chamber being connected to the fourth opening; the aforementioned energy recovery system, wherein both the first channel and the second channel are connected to the third opening; a heat dissipation unit being connected to the first channel; and a liquid storage unit, wherein both the heat dissipation unit and the energy recovery liquid channel are connected to the liquid storage unit.

[0028] Beneficial effects: The hydraulic system using the above-mentioned energy recovery system can not only realize the recovery of hydraulic oil return energy, but also has a simple structure.

[0029] Fourthly, the present invention also provides an engineering machine including the above-mentioned energy recovery device.

[0030] Beneficial effects: The hydraulic system described above can be used in construction machinery to not only recover the energy of hydraulic oil return, but also has a simple structure. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1This is a connection diagram of the energy recovery device according to an embodiment of the present invention.

[0033] Figure 2 This is a structural diagram of the energy recovery device according to an embodiment of the present invention.

[0034] Figure 3 This is a cross-sectional view of the energy recovery device according to an embodiment of the present invention.

[0035] Figure 4 This is a cross-sectional view of the energy recovery unit according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures: 1. Energy recovery device; 2. Hydraulic system; 3. Energy recovery system; 110. Shell; 111. Energy recovery liquid channel; 112. Liquid inlet; 113. Liquid outlet; 114. Shell body; 115. End cap; 116. Mounting cavity; 120. Fin; 130. Rotating shaft; 132. Receiving cavity; 133. First bearing; 134. Second bearing; 200. Energy conversion unit; 210. Conductor; 220. Magnetic field component; 230. Output component; 300. Angle adjustment unit; 310. Valve core; 320. Adjusting rod; 330. Elastic element; 410. Control valve; 420. Pilot pump; 430. Controller; 440. Speed ​​sensor; 500, Energy storage unit; 600, Heat dissipation unit; 700, Liquid storage unit; 810 Power unit; 820 Hydraulic pump; 830 Hydraulic control unit; 831 First opening; 832 Second opening; 833 Third opening; 834 Fourth opening; 840 Actuation unit; 841 Rodless chamber; 842 Rod chamber; 900, Liquid return control unit; 910, Liquid return housing; 911, First channel; 912, Second channel; 920, First pressure valve; 930, Second pressure valve. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "upper," "lower," "inner," and "outer," are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and not to indicate the orientation of the referred device or component in an actual application scenario.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0040] The terms "parallel" and "perpendicular" are relative to the current technological level, not absolute mathematical definitions. Slight deviations are permissible; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, with the angle between them ranging from 0 to 5 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, with the angle between them ranging from 85 to 95 degrees.

[0041] The term "electrical connection" refers to the flow of current or signal from one conductor 210 to another conductor 210. An electrical connection between A and B means that current or signal can flow from A to B and vice versa. This includes direct electrical connections and indirect electrical connections between A and B. A direct electrical connection between A and B means that A and B are physically connected. An indirect electrical connection between A and B means that A and B are connected via C, where C can be at least one wire or device.

[0042] To improve the utilization rate of the kinetic energy of hydraulic oil return, related technologies include adding a hydraulic motor to the hydraulic system. The output shaft of the hydraulic motor can be connected to the generator drive. When the return oil passes through the hydraulic motor, it drives the output shaft to rotate, thereby generating electricity. However, hydraulic motors are not only complex in structure, but also have a low utilization rate of kinetic energy.

[0043] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0044] According to an embodiment of the present invention, an energy recovery device 1 is provided, which includes a housing 110, fins 120, a rotating shaft 130 and an energy conversion unit 200.

[0045] The housing 110 is provided with an energy recovery liquid channel 111, an inlet 112, and an outlet 113, both of which are connected to the energy recovery liquid channel 111. A rotating shaft 130 is rotatably mounted on the housing 110 and is connected to fins 120. The fins 120 are located upstream of the outlet 113 and can be located inside or outside the energy recovery liquid channel 111. Multiple fins 120 can be arranged at circumferential intervals along the rotating shaft 130. Driven by the liquid flowing into the energy recovery liquid channel 111, the fins 120 drive the rotating shaft 130 to rotate around its axis.

[0046] The energy conversion unit 200 includes a conductor 210, a magnetic field component 220, and an output component 230. The magnetic field component 220 has a magnetic field. One of the conductor 210 and the magnetic field component 220 is mounted on the housing 110, and the other is sleeved on the rotating shaft 130. The output component 230 is connected to the conductor 210. The rotating shaft 130 drives the conductor 210 and the magnetic field component 220 to rotate relative to each other, so that the conductor 210 cuts the magnetic field to generate electricity. The output component 230 is used to output electrical energy.

[0047] The conductor 210 can be sleeved on the rotating shaft 130, and the magnetic field component 220 can be installed on the housing 110; alternatively, the magnetic field component 220 can be sleeved on the rotating shaft 130, and the conductor 210 can be installed on the housing 110. The magnetic field component 220 can be a permanent magnet, and the conductor 210 can be a winding. The output component 230 can be connected to the energy storage unit 500, which can be a battery that stores electrical energy to power the electrical components of the construction machinery; alternatively, the output component 230 can be connected to the electrical components of the construction machinery, directly powering them. The electrical components of the construction machinery can be searchlights, buzzers, etc. The output component 230 can include a current stabilizer to ensure a constant output current value, with the output current value fluctuating within a standard range, reducing the probability of damage to the electrical components or the energy storage unit 500. In this way, energy storage can be achieved, eliminating the need for immediate use after production, resulting in high energy utilization.

[0048] When the energy recovery device 1 is applied to the hydraulic system 2 of the construction machinery, during the operation of the construction machinery, the hydraulic oil continuously flows back to the storage unit 700. The energy recovery channel 111 can be located on the return path of the hydraulic oil. That is to say, when the hydraulic oil flows back, it flows through the energy recovery channel 111. The hydraulic oil contacts the fins 120 and can drive the fins 120 to rotate. The fins 120 drive the rotating shaft 130 to rotate around the axis of the rotating shaft 130. The rotating shaft 130 can drive the conductor 210 and the magnetic field component 220 to rotate relative to each other, so that the conductor 210 cuts the magnetic field to generate electricity. The output component 230 guides the generated electricity out.

[0049] In this way, during the hydraulic oil return process, the energy recovery device 1 realizes the sequential conversion between hydraulic energy, mechanical energy and electrical energy, resulting in a high recovery and utilization rate of return oil energy, and eliminating the need for a hydraulic motor, thus simplifying the structure.

[0050] It should be noted that the energy recovery device 1 of this invention can be applied not only to the hydraulic system 2 of engineering machinery, but also to hydraulic oil energy recovery scenarios in other fields.

[0051] In some embodiments, such as Figure 3 As shown, the fin 120 is rotatably mounted on the rotating shaft 130. The axis of the rotating shaft 130 is parallel to the axis of the liquid inlet 112, wherein the axis of the rotating shaft 130 and the axis of the liquid inlet 112 can coincide. On the projection plane perpendicular to the axis of the rotating shaft 130, the orthographic projection of the fin 120 is the fin projection. The energy recovery device 1 also includes an angle adjustment unit 300, which is drivenly connected to the fin 120 and is used to adjust the area of ​​the fin projection.

[0052] By setting the angle adjustment unit 300, when the liquid inlet of the energy recovery liquid channel 111 decreases, the contact area between the fins 120 and the hydraulic oil can be increased; when the liquid inlet of the energy recovery liquid channel 111 increases, the contact area between the fins 120 and the hydraulic oil can be reduced. This can maintain the relative rotational speed between the conductor 210 and the magnetic field component 220, reduce the fluctuation of various power generation parameters, and help extend the service life of electrical components and energy storage unit 500.

[0053] It should be noted that in some embodiments, the axis of the rotating shaft 130 and the axis of the inlet 112 of the energy recovery liquid channel 111 can also be arranged perpendicularly. The energy recovery device 1 can meet the usage requirements in different environments.

[0054] Specifically, such as Figure 3 and Figure 4 As shown, a receiving cavity 132 is provided inside the rotating shaft 130. The angle adjustment unit 300 is movably disposed within the receiving cavity 132. The angle adjustment unit 300 is hydraulically controlled to move within the receiving cavity 132 to adjust the area of ​​the fin projection. The energy recovery device 1 also includes a control valve 410 and a controller 430. The control valve 410 has a regulating liquid passage, one end of which is connected to the receiving cavity 132, and the other end is connected to an external hydraulic source. The controller 430 is electrically connected to the control valve 410 and is used to control the opening degree of the regulating liquid passage.

[0055] In this way, the controller 430 can adjust the pressure applied to the angle adjustment unit 300 by the hydraulic source, thereby controlling the angle adjustment unit 300 to move in the receiving cavity 132, so as to adjust the contact area between the fins 120 and the hydraulic oil, thereby effectively maintaining the relative rotational speed between the conductor 210 and the magnetic field component 220, reducing the fluctuation of various power generation parameters, and helping to extend the service life of electrical components and energy storage unit 500.

[0056] like Figure 4 As shown, the angle adjustment unit 300 includes a valve core 310, an adjusting rod 320, and an elastic element 330. The valve core 310 is movably disposed within the receiving cavity 132, and hydraulic control within the receiving cavity 132 allows the valve core 310 to move within the receiving cavity 132. The adjusting rod 320 is connected to the fin 120. The elastic element 330 abuts against the valve core 310 and the adjusting rod 320.

[0057] The elastic element 330 may include at least one spring.

[0058] The hydraulic source applies pressure to the valve core 310, the valve core 310 applies pressure to the elastic element 330, the elastic element 330 applies pressure to the adjusting rod 320, and the adjusting rod 320 pushes the fin 120 to rotate relative to the rotating shaft 130, thereby adjusting the angle of the fin 120 and changing the contact area of ​​the hydraulic oil with the fin 120.

[0059] In this way, the fluid in the elastic element 330 and the receiving cavity 132 can apply an adjusting force to the valve core 310 from opposite sides of the rotating shaft 130 in the axial direction, effectively changing the pressure applied by the elastic element 330 to the adjusting rod 320, thereby better matching the contact area between the fin 120 and the hydraulic oil and the flow rate of the hydraulic oil.

[0060] In some embodiments, such as Figure 2 and Figure 4 As shown, the energy recovery device 1 also includes a speed sensor 440, which is installed in the housing 110. The speed sensor 440 is used to detect the relative rotational speed of the conductor 210 and the magnetic field component 220. The controller 430 is electrically connected to the speed sensor 440. The controller 430 controls the opening of the regulating fluid channel according to the feedback value of the speed sensor 440.

[0061] The controller 430 controls the opening of the regulating fluid passage based on the detection feedback value of the speed sensor 440, thereby controlling the movement stroke of the valve core 310. It can adjust the area of ​​the fin projection, thereby adjusting the pressure applied by the hydraulic oil to the fin 120. This allows for more precise control of the relative rotational speed of the conductor 210 and the magnetic field component 220, further reducing fluctuations in power generation parameters.

[0062] In some embodiments, such as Figures 2-4As shown, the housing 110 includes a housing body 114 and an end cap 115. The housing body 114 is provided with an energy recovery liquid channel 111, an inlet 112, and an outlet 113. The end cap 115 is connected to the housing body 114, and a mounting cavity 116 is formed between the end cap 115 and the housing body 114. The conductor 210 and the magnetic field component 220 are installed in the mounting cavity 116, and the output component 230 passes through the end cap 115 and is connected to the conductor 210.

[0063] In this way, on the one hand, the housing 110 can fix the relative position between the fins 120, the rotating shaft 130 and the energy conversion unit 200, thereby improving the transmission reliability; on the other hand, since the conductor 210 and the magnetic field component 220 are located in the mounting cavity 116, the housing 110 can protect the conductor 210 and the magnetic field component 220, thereby reducing the probability of damage to the conductor 210 and the magnetic field component 220.

[0064] Furthermore, the housing body 114 and the end cap 115 are not a single integrated structure; they are detachable to facilitate the installation of the conductor 210 and the magnetic field component 220, as well as subsequent maintenance. The housing body 114 and the end cap 115 can be connected via snap-fit, fasteners, or threads. Elastic structures such as rubber or foam can be incorporated between the housing body 114 and the end cap 115 for sealing, improving the sealing effect.

[0065] The energy recovery fluid channel 111 has an inlet 112 formed at one axial end of the housing body 114, and an end cap 115 connected to the other axial end of the housing body 114. The outlet 113 of the energy recovery fluid channel 111 is formed on the side wall of the housing body 114, thus shortening the length of the energy recovery fluid channel 111 and improving the flow efficiency of the hydraulic oil. The energy recovery fluid channel 111 and the mounting cavity 116 are separated to prevent hydraulic oil from flowing into the mounting cavity 116, thereby improving power generation efficiency.

[0066] Furthermore, such as Figure 3 As shown, the energy recovery device 1 also includes a first bearing 133, which is located between the rotating shaft 130 and the housing body 114. In the axial direction of the rotating shaft 130, the first bearing 133 is located on the side of the energy conversion unit 200 facing the fins 120.

[0067] By setting the first bearing 133, the relative position between the rotating shaft 130 and the housing body 114 is fixed, while the friction between the rotating shaft 130 and the housing body 114 is reduced, the transmission efficiency is improved, and the first bearing 133 can stabilize the fins 120, prevent the rotating shaft 130 and the fins 120 from lateral force disturbance when the flow rate of hydraulic oil changes, and improve the reliability of movement.

[0068] The energy recovery device 1 also includes a second bearing 134, which is located between the rotating shaft 130 and the end cover 115. In the axial direction of the rotating shaft 130, the second bearing 134 is located on the side of the energy conversion unit 200 facing away from the fins 120.

[0069] By setting the second bearing 134, the relative position between the rotating shaft 130 and the end cover 115 is fixed, while the friction between the rotating shaft 130 and the end cover 115 is reduced, which further improves the positional stability of the rotating shaft 130. In addition, the second bearing 134 can stabilize the energy conversion unit 200 and prevent the energy conversion unit 200 from moving axially on the rotating shaft 130 when the rotation speed changes, thus ensuring the energy conversion efficiency.

[0070] According to an embodiment of the present invention, in another aspect, an energy recovery system 3 is also provided. For example... Figure 2 and Figure 3 As shown, the energy recovery system 3 includes a liquid return control unit 900 and an energy recovery device 1.

[0071] The liquid return control unit 900 includes a liquid return housing 910, a first pressure valve 920, and a second pressure valve 930. The liquid return housing 910 is provided with a first channel 911 and a second channel 912. The first pressure valve 920 is located in the first channel 911, and the second pressure valve 930 is located in the second channel 912. Both the first channel 911 and the second channel 912 are connected to a third opening 833. The opening pressure of the first pressure valve 920 is less than the opening pressure of the second pressure valve 930. The energy recovery liquid channel 111 is connected to the second channel 912. The first channel 911 is adapted to be connected to the heat dissipation unit 600.

[0072] The return fluid control unit 900 ensures the circulation of hydraulic oil and the overall system. The first pressure valve 920 and the second pressure valve 930 maintain a constant return oil pressure in the hydraulic system. The opening pressure of the first pressure valve 920 and the second pressure valve 930 is generally set between 0.5 bar and 2 bar, for example, 0.5 bar, 1 bar, 1.5 bar or 2 bar. The opening pressure of the first pressure valve 920 is about 1 bar lower than the opening pressure of the second pressure valve 930.

[0073] When the return oil volume is relatively small, the hydraulic oil flows into the reservoir unit 700 after passing through the first pressure valve 920 and the heat dissipation unit 600. When the return oil volume is relatively large, part of the hydraulic oil flows into the reservoir unit 700 through the first pressure valve 920 and the heat dissipation unit 600, and the other part of the hydraulic oil flows into the reservoir unit 700 through the second pressure valve 930 and the energy recovery fluid channel 111.

[0074] In this way, when the return oil volume is relatively large, some hydraulic oil does not flow through the heat dissipation unit 600, but instead flows through the energy recovery fluid channel 111, which avoids excessive flow in the heat dissipation unit 600, protects the flow capacity of the heat dissipation unit 600, and helps maintain the flow balance of the hydraulic system 2.

[0075] Specifically, the fin 120 is located in the second channel 912, or the fin 120 is located in the energy recovery liquid channel 111, or a portion of the fin 120 is located in the second channel 912 and another portion is located in the energy recovery liquid channel 111. In this way, the fin 120 can fully contact the liquid to absorb the kinetic energy of the liquid and improve the energy recovery efficiency.

[0076] The energy recovery system 3 of this invention, utilizing the energy recovery device 1 described above, can not only realize the recovery of hydraulic oil return energy, but also has a simple structure.

[0077] According to an embodiment of the present invention, in another aspect, a hydraulic system 2 is also provided, such as... Figure 1 and Figure 3 As shown, the hydraulic system 2 includes a hydraulic pump 820, a hydraulic control unit 830, an execution unit 840, an energy recovery system 3, a heat dissipation unit 600, and a liquid storage unit 700.

[0078] The hydraulic control unit 830 has a first opening 831, a second opening 832, a third opening 833, and a fourth opening 834. The first opening 831 is connected to the hydraulic pump 820. The execution unit 840 has a rodless chamber 841 and a rod chamber 842. The rodless chamber 841 is connected to the second opening 832, and the rod chamber 842 is connected to the fourth opening 834. The heat dissipation unit 600 is connected to the first channel 911. Both the heat dissipation unit 600 and the energy recovery fluid channel 111 are connected to the liquid storage unit 700.

[0079] The hydraulic pump 820 can be connected to a power unit 810, which provides energy input to the hydraulic pump 820 and the hydraulic pump 820 provides energy input to the hydraulic system 2. The power unit 810 can be an electric motor.

[0080] The hydraulic control unit 830 can be a multi-way valve. The hydraulic control unit 830 is used to allocate the amount of hydraulic oil flowing to the actuator 840, the flow rate flowing to the energy recovery device 1, and the inflow and outflow of hydraulic oil to the actuator 840.

[0081] The actuator 840 provides controlled actions for the construction machinery and can be a lifting cylinder, a rotating cylinder, etc. By controlling the connection and disconnection of the first opening 831 with the second opening 832 or the fourth opening 834, when the actuator 840 is a lifting cylinder, it can realize the lifting and lowering of the lifting cylinder; when the actuator 840 is a rotating cylinder, it can realize the forward and reverse rotation of the rotating cylinder.

[0082] During the operation of construction machinery, hydraulic oil, as a flowing medium, generates heat. The heat dissipation unit 600 dissipates the excess heat of the hydraulic oil, maintaining the thermal balance of the hydraulic system 2.

[0083] The reservoir unit 700 stores hydraulic oil, providing a fluid medium for energy transfer to the hydraulic system 2.

[0084] Hydraulic system 2 also includes pilot pump 420, which is connected to hydraulic pump 820. Hydraulic pump 820 provides energy input to pilot pump 420. Pilot pump 420 is connected to control valve 410 and provides hydraulic oil to control valve 410. No additional hydraulic source is required, and the structure is simpler.

[0085] The hydraulic system 2 of this embodiment of the invention, utilizing the energy recovery system 3 described above, can not only realize the recovery of hydraulic oil return energy, but also has a simple structure.

[0086] According to an embodiment of the present invention, in another aspect, an engineering machine is also provided, which includes the energy recovery device 1 described above. The engineering machine can be an excavator, a pile driver, a loader, a rotary drilling rig, a bulldozer, or other engineering machinery.

[0087] The engineering machinery of this invention, utilizing the hydraulic system 2 described above, can not only achieve hydraulic oil return energy recovery, but also has a simple structure.

[0088] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An energy recovery device, characterized in that, include: The housing (110) is provided with an energy recovery liquid channel (111), an inlet (112) and an outlet (113), wherein the inlet (112) and the outlet (113) are both connected to the energy recovery liquid channel (111); A rotating shaft (130) is rotatably mounted on the housing (110). The fins (120) are connected to the rotating shaft (130) and are located upstream of the liquid outlet (113). Driven by the liquid flowing towards the energy recovery channel (111), the fins (120) drive the rotating shaft (130) to rotate around the axis of the rotating shaft (130). An energy conversion unit (200) includes a conductor (210), a magnetic field component (220), and an output component (230). The magnetic field component (220) has a magnetic field. One of the conductor (210) and the magnetic field component (220) is mounted on the housing (110), and the other is sleeved on the rotating shaft (130). The output component (230) is connected to the conductor (210). The rotating shaft (130) drives the conductor (210) and the magnetic field component (220) to rotate relative to each other, so that the conductor (210) cuts the magnetic field to generate electricity. The output component (230) is used to output electrical energy.

2. The energy recovery device according to claim 1, characterized in that, The fin (120) is rotatably mounted on the rotating shaft (130). The axis of the liquid inlet (112) is parallel to the axis of the rotating shaft (130). On the projection plane perpendicular to the axis of the rotating shaft (130), the orthographic projection of the fin (120) is the fin projection. The energy recovery device (1) further includes an angle adjustment unit (300), which is connected to the fin (120) for adjusting the area of ​​the fin projection.

3. The energy recovery device according to claim 2, characterized in that, The rotating shaft (130) is provided with a receiving cavity (132), and the angle adjustment unit (300) is movably disposed in the receiving cavity (132). The angle adjustment unit (300) is hydraulically driven to move within the receiving cavity (132) to adjust the area of ​​the fin projection. The energy recovery device (1) further includes a control valve (410) and a controller (430). The control valve (410) is provided with a regulating liquid channel. One end of the regulating liquid channel is connected to the receiving cavity (132), and the other end of the regulating liquid channel is connected to a hydraulic source. The controller (430) is electrically connected to the control valve (410) and is used to control the opening degree of the regulating liquid channel.

4. The energy recovery device according to claim 3, characterized in that, The angle adjustment unit (300) includes: The valve core (310) is movably disposed within the receiving cavity (132), and the valve core (310) is hydraulically controlled to move within the receiving cavity (132); An adjusting rod (320) is connected to the fin (120); The elastic element (330) abuts between the valve core (310) and the adjusting rod (320).

5. The energy recovery device according to claim 3, characterized in that, The energy recovery device (1) also includes: A speed sensor (440) is installed in the housing (110). The speed sensor (440) is used to detect the relative rotational speed of the conductor (210) and the magnetic field component (220). The controller (430) is electrically connected to the speed sensor (440). The controller (430) controls the opening of the regulating fluid channel according to the feedback value of the speed sensor (440).

6. The energy recovery device according to claim 1, characterized in that, The housing (110) includes: The shell body (114) is provided with the energy recovery liquid channel (111), the liquid inlet (112) and the liquid outlet (113). An end cap (115) is connected to the shell body (114), and an installation cavity (116) is formed between the end cap (115) and the shell body (114). The conductor (210) and the magnetic field element (220) are installed in the installation cavity (116), and the output element (230) passes through the end cap (115) and is connected to the conductor (210).

7. The energy recovery device according to claim 6, characterized in that, The energy recovery device (1) also includes: A first bearing (133) is disposed between the rotating shaft (130) and the housing body (114), in the axial direction of the rotating shaft (130), the first bearing (133) being located on the side of the energy conversion unit (200) facing the fins (120); and / or, The second bearing (134) is disposed between the rotating shaft (130) and the end cover (115). In the axial direction of the rotating shaft (130), the second bearing (134) is located on the side of the energy conversion unit (200) facing away from the fin (120).

8. The energy recovery device according to claim 6, characterized in that, The liquid inlet (112) and the end cap (115) are located at opposite ends of the shell body (114), and the liquid outlet (113) is located on the side wall of the shell body (114).

9. An energy recovery system, characterized in that, include: The liquid return control unit (900) includes a liquid return housing (910), a first pressure valve (920), and a second pressure valve (930). The liquid return housing (910) is provided with a first channel (911) and a second channel (912). The first pressure valve (920) is located in the first channel (911), and the second pressure valve (930) is located in the second channel (912). The opening pressure of the first pressure valve (920) is less than the opening pressure of the second pressure valve (930). In the energy recovery device (1) as described in any one of claims 1-8, the first channel (911) is adapted to communicate with the heat dissipation unit (600), and the energy recovery liquid channel (111) is communicated with the second channel (912).

10. The energy recovery system according to claim 9, characterized in that, The fins (120) are located in the second channel (912) and / or the energy recovery liquid channel (111).

11. A hydraulic system, characterized in that, include: Hydraulic pump (820); The hydraulic control unit (830) is provided with a first opening (831), a second opening (832), a third opening (833) and a fourth opening (834), wherein the first opening (831) is connected to the hydraulic pump (820); The execution unit (840) has a rodless cavity (841) and a rod cavity (842), wherein the rodless cavity (841) is connected to the second opening (832) and the rod cavity (842) is connected to the fourth opening (834); In the energy recovery system (3) as described in claim 9 or 10, both the first channel (911) and the second channel (912) are connected to the third opening (833); A heat dissipation unit (600) is connected to the first channel (911); The liquid storage unit (700), the heat dissipation unit (600) and the energy recovery liquid channel (111) are all connected to the liquid storage unit (700).

12. An engineering machinery, characterized in that, Includes the hydraulic system (2) as described in claim 11.

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