Built-in integrated hydraulic power unit

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a built-in integrated hydraulic power unit which comprises an oil tank, a motor and an oil pump which are arranged in the oil tank, and a motor driver which is arranged outside the oil tank and controls the motor, and the motor drives the oil pump. The oil pump is connected with an oil inlet filter and an oil outlet pipe connector through pipelines, the oil inlet filter is located in the oil tank, and the oil outlet pipe connector is arranged on the side wall of the oil tank and communicated with the outer side of the oil tank. The oil tank is further provided with an oil return filter, the oil return filter comprises a filtering part located inside the oil tank and a connector part located outside the oil tank, and the connector part is communicated with the outer side of the oil tank. The motor and the oil pump are both arranged in the oil tank and immersed in hydraulic oil, so that noise is lower, temperature rise is not prone to occurring, and meanwhile the risk of oil leakage of a hydraulic part connector is reduced to the maximum extent; the whole appearance is simple, the structure is compact, and the space utilization rate of the machine is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to an internal integrated hydraulic power unit. Background Technique

[0002] For traditional external hydraulic power units, since most of their components are arranged outside the fuel tank, they have a large volume, are prone to generate noise during operation, and there is also a risk of oil leakage at the connections of various components. Currently, there have emerged related internal hydraulic power unit structures, such as the internal immersion integrated hydraulic power unit with the application number 200520078399.1 and the name, and the waterproof hydraulic power mechanism with the application number 201810018905.X and the name, etc., all of which have the advantages of reducing noise, reducing volume, and good heat dissipation performance. However, in the existing publicly disclosed patents, the integration degree of the hydraulic power unit is not high enough, and there is still room for further optimization in the positional relationship and connection relationship between various components. Content of the Utility Model

[0003] The purpose of the utility model is to provide an internal integrated hydraulic power unit to solve the problems put forward in the background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: an internal integrated hydraulic power unit, including a fuel tank, a motor and an oil pump arranged inside the fuel tank, and a motor driver arranged outside the fuel tank, the motor driver controls the motor, and the motor drives the oil pump; the oil pump is respectively connected with an oil inlet filter and an oil outlet joint through pipelines, the oil inlet filter is located inside the fuel tank, and the oil outlet joint is arranged on the side wall of the fuel tank, communicating with the outside of the fuel tank; the fuel tank is also provided with a return oil filter, and the return oil filter includes a filtering part located inside the fuel tank and a joint part located outside the fuel tank, and the joint part communicates with the outside of the fuel tank.

[0005] Preferably, the motor is a DC permanent magnet brushless synchronous motor, and the oil pump is a gear pump.

[0006] Preferably, the motor includes a rotor shaft, one end of the rotor shaft is connected to the oil pump, and the other end is embedded with a magnet; at the end embedded with the magnet, a corresponding magnetic encoder is installed on the motor, a docking hole for storing the magnetic encoder is opened at the top of the fuel tank, and the magnetic encoder is electrically connected to the motor controller from the outside of the fuel tank.

[0007] Preferably, an annular gasket is arranged between the end face of the motor and the inner side wall of the fuel tank at the end where the magnetic encoder is installed.

[0008] Preferably, an upper cover plate is further provided on the outer side of the fuel tank. The upper cover plate is fixed to the top of the fuel tank and covers the magnetic encoder and its electrical connection part. At the same time, the upper cover plate has a bent part, and the bent part is closely attached to the side wall of the fuel tank for fixing the motor driver.

[0009] Preferably, the fuel tank includes a fuel tank shell and a fuel tank bottom plate. The fuel tank shell and the fuel tank bottom plate are fastened by bolts, and a gasket is provided at the joint; the fuel tank bottom plate is made of aluminum alloy material, and heat dissipation ribs are evenly distributed on the side facing the outside of the fuel tank.

[0010] Preferably, the fuel tank shell is made of translucent engineering plastic.

[0011] Preferably, a gasket is provided at the joint between the oil return filter and the fuel tank.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the present utility model, both the motor and the oil pump are arranged in the fuel tank and immersed in the hydraulic oil, so that the noise is lower, it is not easy to heat up, and at the same time, the risk of oil leakage at the hydraulic component interface is minimized; the overall appearance is simple and the structure is compact, and the space utilization rate of the machine is higher. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0014] Figure 2 is Figure 1 a schematic structural diagram of the interior of the fuel tank in

[0015] Figure 3 is Figure 1 a schematic structural diagram of the fuel tank shell in

[0016] Figure 4 is Figure 3 a bottom view of the fuel tank shell in

[0017] Figure 5 is a top view of the connection structure between the magnetic encoder and the motor in an embodiment of the present utility model;

[0018] Figure 6 is Figure 1 a schematic structural diagram of the upper cover plate in Detailed Embodiments

[0019] Please refer to Figure 1-6, in the embodiment of the present utility model, an in-built integrated hydraulic power unit is disclosed, which includes an oil tank 1, a motor 2, an oil pump 3, an inlet oil filter 51, a return oil filter 52, an outlet pipe joint 6, a magnetic encoder 82, a magnetic steel 81, a motor driver 4, etc. The motor 2 is a DC permanent magnet brushless synchronous motor, eliminating the trouble of replacing the carbon brushes of a brushed motor.

[0020] Refer to Figure 1 and Figure 3 , the overall structure of the present utility model is a cuboid structure, and the oil tank 1 is generally also a cuboid structure. The oil tank 1 is composed of an oil tank shell 11 and an oil tank bottom plate 12. The oil tank shell 11 and the oil tank bottom plate 12 are fastened by bolts, and a gasket 9 is provided at the joint.

[0021] The oil tank shell 11 is made of a semi-transparent engineering plastic with a light weight, which never rusts or corrodes, so that the actual capacity of the hydraulic oil can be observed without installing an oil level scale. The oil tank bottom plate 12 is made of aluminum alloy material, and a uniformly distributed heat dissipation rib 13 is provided on the side facing the outside of the oil tank 1, which can well dissipate heat and cool the hydraulic oil, and at the same time keep the hydraulic system working efficiently, and maximize the service life of the hydraulic components.

[0022] The motor driver 4 is arranged outside the oil tank 1, and the motor 2, the oil pump 3 and the inlet oil filter 51 are all arranged inside the oil tank 1. Combining Figure 2 and Figure 3 , and at the same time, since most of the space in the oil tank 1 is used to store hydraulic oil, the motor 2, the oil pump 3, etc. are all immersed in the hydraulic oil under normal conditions. The motor driver 4 controls the motor 2, and the output end of the motor 2 is connected to the oil pump 3 to drive the oil pump 3.

[0023] Refer to Figure 4 , an annular mounting wall 14 is integrally formed on the inner side of the oil tank shell 11. One end of the motor 2 is placed in the mounting wall 14, and its outermost circle is fixed to the mounting wall 14 by bolts. A circular docking hole 15 is opened at the center of the oil tank shell 11 corresponding to this end of the motor 2. At this end, a magnetic encoder 82 and a magnetic steel 81 are arranged on the motor 2. The magnetic steel 81 is embedded at the end of the rotor shaft inside the motor 2. Three arc-shaped waist holes are opened on the magnetic encoder 82, and each arc-shaped waist hole is sleeved with a bolt. The bolt is fixed to this end of the motor 2 so that the magnetic encoder 82 and the magnetic steel 81 are exactly located at the center of this end of the motor 2, and the two cooperate with each other. Specifically, refer to Figure 5 . The magnetic encoder 82 is located in the docking hole 15 and is electrically connected to the motor 2 controller from the outside of the oil tank 1 through the docking hole 15.

[0024] An annular gasket 9 is provided between the end face of the motor 2 and the inner side wall of the fuel tank housing 11. The gasket 9 is also located between the mounting wall 14 and the docking hole 15 to prevent hydraulic oil from overflowing from the end of the motor 2 into the fuel tank 1 due to the shaking of the motor 2. By using the magnetic steel 81 and the magnetic encoder 82 in cooperation, the angle of the motor 2 is collected and output to the motor driver 4, and the angle of the motor 2 is controlled in real time according to the command of the motor driver 4, so that the oil quantity control accuracy is higher.

[0025] To protect the magnetic encoder 82 and its electrical connection part with the motor 2 controller, a raised plate 18 and an upper cover plate 7 are also provided on the outside of the fuel tank 1. The raised plate 18 is integrally formed with the fuel tank housing 11 and protrudes from the outer surface of the fuel tank housing 11. The raised plate 18 surrounds the docking hole 15, the magnetic encoder 82 and its electrical connection part, and the upper cover plate 7 covers the raised plate 18, and the two are fixed by bolts. When the upper cover covers the raised plate 18, it also covers the magnetic encoder 82 and the electrical connection part inside it.

[0026] Combined Figure 1 with Figure 6 and, the upper cover plate 7 also has a bent part 71 and a top eaves part 72. The top eaves part 72 is perpendicular to the bent part 71, and the bent part 71 is a metal plate. When the upper cover plate 7 is fixed to the top of the fuel tank housing 11, the bent part 71 closely adheres to the outer side wall of the fuel tank housing 11, and the motor driver 4 is directly fixed to the bent part 71 by bolts, which is convenient for wiring and heat dissipation. A connection hole 73 through which the power connection part passes is provided on the upper side of the bent part 71, and the magnetic encoder 82 can be electrically connected to the motor driver 4 along the surface of the fuel tank housing 11 and through the connection hole 73.

[0027] The top eaves part 72 is located above the connection hole 73 and the motor driver 4, and plays a certain degree of shielding and protection role for the lower connection and the motor driver 4. A vent hole 16 is also provided on the fuel tank housing 11. The vent hole 16 is located at the top of the fuel tank housing 11 and is close to the connection hole 73 at the same time, and is not communicated with the inside of the mounting wall 14.

[0028] The end of the rotor shaft of the motor 2 far from the magnetic steel 81 is connected to the oil pump 3, and the oil pump 3 is a gear pump. Refer to Figure 2 , the oil pump 3 is respectively connected to the inlet filter 51 and the outlet pipe joint 6 through pipelines. The inlet filter 51 is located inside the fuel tank 1 and as close as possible to the lowest end inside the fuel tank 1. The outlet pipe joint 6 is fixed to the side wall of the fuel tank 1 through an opening in the side wall of the fuel tank 1 and communicates with cylinders, hydraulic motors, etc. outside the fuel tank 1. When the motor 2 is started, the hydraulic oil in the fuel tank 1 passes through the inlet filter 51, the oil pump 3 and the outlet pipe joint 6 in sequence.

[0029] Combined Figure 1 with Figure 2, the oil return filter 52 includes a filtering portion 522 located inside the fuel tank 1 and a joint portion 521 located outside the fuel tank 1. The joint portion 521 is connected to the oil return device outside the fuel tank 1. The entire oil return filter 52 is fixed to the fuel tank housing 11 by bolts, and a gasket 9 is provided at the joint between the two to prevent hydraulic oil from leaking out. For convenient integration, the fuel tank housing 11 is recessed at the top corners and provided with mounting holes 17 to provide an installation space for the joint portion 521.

[0030] In summary, in the present utility model, both the motor and the oil pump are arranged inside the fuel tank and immersed in the hydraulic oil, so that the noise is lower, it is not easy to heat up, and at the same time, the risk of oil leakage at the hydraulic component interface is minimized; the overall appearance is simple and the structure is compact, and the space utilization rate of the machine is higher.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An in-built integrated hydraulic power unit, characterized in that: It includes a fuel tank (1), a motor (2) and an oil pump (3) arranged inside the fuel tank (1), and a motor driver (4) arranged outside the fuel tank (1). The motor driver (4) controls the motor (2), and the motor (2) drives the oil pump (3); the oil pump (3) is respectively connected with an inlet oil filter (51) and an outlet oil pipe joint (6) through pipelines. The inlet oil filter (51) is located inside the fuel tank (1), and the outlet oil pipe joint (6) is arranged on the side wall of the fuel tank (1) and communicates with the outside of the fuel tank (1); the fuel tank (1) is also provided with a return oil filter (52). The return oil filter (52) includes a filtering part (522) located inside the fuel tank (1) and a joint part (521) located outside the fuel tank (1), and the joint part (521) communicates with the outside of the fuel tank (1).

2. The built-in integrated hydraulic power unit according to claim 1, characterized in that: The motor (2) is a DC permanent magnet brushless synchronous motor, and the oil pump (3) is a gear pump.

3. The built-in integrated hydraulic power unit according to claim 1 or 2, characterized in that: The motor (2) includes a rotor shaft. One end of the rotor shaft is connected to the oil pump (3), and the other end is embedded with a permanent magnet (81); at the end embedded with the permanent magnet (81), a corresponding magnetic encoder (82) is installed on the motor (2). A docking hole (15) for storing the magnetic encoder (82) is opened at the top of the fuel tank (1), and the magnetic encoder (82) is electrically connected to the motor (2) controller from the outside of the fuel tank (1).

4. The built-in integrated hydraulic power unit according to claim 3, characterized in that: At the end where the magnetic encoder (82) is installed, an annular gasket (9) is arranged between the end face of the motor (2) and the inner side wall of the fuel tank (1).

5. The built-in integrated hydraulic power unit according to claim 3, characterized in that: An upper cover plate (7) is also arranged outside the fuel tank (1). The upper cover plate (7) is fixed to the top of the fuel tank (1) and covers the magnetic encoder (82) and its electrical connection part. At the same time, the upper cover plate (7) has a bent part (71), and the bent part (71) is closely attached to the side wall of the fuel tank (1) for fixing the motor driver (4).

6. The built-in integrated hydraulic power unit according to claim 1, characterized in that: The fuel tank (1) includes a fuel tank housing (11) and a fuel tank bottom plate (12). The fuel tank housing (11) and the fuel tank bottom plate (12) are fastened by bolts, and a gasket (9) is arranged at the joint; the fuel tank bottom plate (12) is made of aluminum alloy material, and a uniformly distributed heat dissipation rib (13) is arranged on the side facing the outside of the fuel tank (1).

7. The built-in integrated hydraulic power unit according to claim 6, characterized in that: The fuel tank housing (11) is made of translucent engineering plastic.

8. The built-in integrated hydraulic power unit according to claim 1, characterized in that: A gasket (9) is arranged at the joint between the return oil filter (52) and the fuel tank (1).

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