A highly integrated hydraulic power unit

Abstract

The utility model relates to the technical field of automobile parts hydraulic system, concretely, it is a kind of high integration's hydraulic power unit, comprising: motor, oil tank, hydraulic valve block assembly and hydraulic gear pump, the hydraulic valve block assembly includes hydraulic valve block, reversing valve, check valve and hydraulic buffer energy accumulator, one end of the hydraulic valve block is connected with the motor, and the other end is connected with the oil tank, the reversing valve is integrated on the hydraulic valve block, the check valve is installed in the assembly oil inlet of the hydraulic valve block, the hydraulic buffer energy accumulator is integrated on the hydraulic valve block, the hydraulic gear pump is located in the oil tank, and it is connected with the hydraulic valve block, and its input end is connected with the output end of the motor, the utility model adopts pipeline built-in check valve and smaller electromagnetic reversing valve instead of traditional larger electromagnetic reversing valve and external check valve, has the advantages of small volume, high integration, less fault point and low cost.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology for automotive parts, specifically to a highly integrated hydraulic power unit. Background Technology

[0002] A hydraulic power unit, also known as an oil supply device, is the core power source equipment of an industrial hydraulic control system. It consists of an oil tank, oil pump, accumulator, and control components, forming a closed oil source system. Its main function is to connect to hydraulic cylinders through external pipelines to achieve precise control of the actions of multiple valves. It is widely used in engineering machinery and industrial machinery.

[0003] Traditional hydraulic power units mostly use DC or AC motors, electromagnetic directional valves and external check valves to control the direction of oil flow, and integrated gear pump units with relatively poor performance. These characteristics result in traditional hydraulic power units having poor integration, large size, and high cost, making them unsuitable for increasingly sophisticated industries. Utility Model Content

[0004] The purpose of this invention is to provide a highly integrated hydraulic power unit. This hydraulic power unit employs a DC motor drive and a highly integrated gear pump unit. Furthermore, it replaces the traditional bulky electromagnetic directional valve and external check valve with a built-in pipe check valve and a smaller external solenoid directional valve within the hydraulic valve block. Compared to traditional hydraulic power units, this hydraulic power unit is smaller, more integrated, has fewer potential failure points, and is lower in cost.

[0005] The technical solution of this utility model is: a highly integrated hydraulic power unit, comprising:

[0006] An electric motor, used to provide power to the hydraulic power unit;

[0007] An oil tank, which supplies oil to the hydraulic power unit;

[0008] A hydraulic valve block assembly includes a hydraulic valve block, one end of which is connected to the motor and the other end to the oil tank. The hydraulic valve block has an assembly inlet, an assembly outlet, and an assembly return port. The assembly inlet and outlet are connected via a hydraulic circuit, and the assembly outlet and return port are connected via a return circuit. The hydraulic valve block assembly also includes a directional valve, a check valve, and a hydraulic buffer accumulator. The directional valve is integrated on the hydraulic valve block; the check valve is installed inside the assembly inlet of the hydraulic valve block; and the hydraulic buffer accumulator is integrated on the hydraulic valve block opposite the directional valve.

[0009] A hydraulic gear pump is located inside the oil tank and connected to the hydraulic valve block. Its input end is connected to the output end of the motor. The hydraulic gear pump includes a hydraulic gear pump inlet and a hydraulic gear pump outlet. The hydraulic gear pump inlet is connected to the oil tank. The hydraulic gear pump outlet is connected to the assembly inlet on the hydraulic valve block.

[0010] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the check valve is a highly integrated built-in check valve, which is installed in the hydraulic oil circuit of the hydraulic valve block and is connected to the oil inlet of the assembly.

[0011] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the hydraulic oil circuit is connected to the oil inlet of the hydraulic valve block assembly, the internal oil passage of the one-way valve, the internal oil passage of the hydraulic buffer accumulator, and the oil outlet of the hydraulic valve block assembly.

[0012] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the return oil circuit is connected to the oil outlet of the hydraulic valve block assembly, the internal oil passage of the hydraulic buffer accumulator, the internal oil passage of the reversing valve, and the oil outlet of the hydraulic valve block assembly.

[0013] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the hydraulic oil circuit and the return oil circuit share a common oil circuit, and the common oil circuit connects the oil outlet of the hydraulic valve block assembly with the internal oil passage of the hydraulic buffer accumulator.

[0014] According to the present invention, a highly integrated hydraulic power unit is provided, wherein a temperature sensor is also connected to the part of the oil tank connected to the hydraulic valve block.

[0015] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the hydraulic valve block assembly further includes a pressure sensor, which is connected to the hydraulic valve block and its internal oil passage is connected to the internal oil circuit of the hydraulic valve block.

[0016] According to the present invention, a highly integrated hydraulic power unit is provided, wherein a silencer valve is connected to the oil return port of the assembly on the hydraulic valve block.

[0017] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the hydraulic valve block is further provided with a coupling, the coupling is installed inside the hydraulic valve block, one end of which is connected to the output end of the motor, and the other end is connected to the input end of the hydraulic gear pump.

[0018] According to the present invention, a highly integrated hydraulic power unit is provided, wherein a plugging ball is provided at the connection between the hydraulic oil circuit, the return oil circuit and the outer wall of the hydraulic valve block.

[0019] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the hydraulic valve block is also provided with multiple weight reduction grooves.

[0020] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the hydraulic valve block is provided with shock-absorbing bolt mounting grooves on both sides.

[0021] According to the present invention, a highly integrated hydraulic power unit includes a directional valve comprising a valve sleeve and a valve core. The valve sleeve is a hollow tube structure with a lateral oil inlet on its side wall and a directional valve outlet at its end. The lateral oil inlet is connected to the hydraulic oil circuit, and the directional valve outlet is connected to the return oil circuit. The valve core is located inside the valve sleeve, and its diameter is equal to the inner diameter of the valve sleeve, allowing it to move axially within the valve sleeve along the directional valve.

[0022] According to the present invention, a highly integrated hydraulic power unit includes a reversing valve further comprising an electromagnetic coil, an electromagnet, a push rod, and a reversing valve spring. The electromagnetic coil is sleeved on the outer periphery of the electromagnet. The push rod is connected to the electromagnet. The reversing valve spring connects the push rod to the valve core.

[0023] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the valve sleeve is connected to the hydraulic valve block, and a sealing ring is provided at the connection between the valve sleeve and the hydraulic valve block.

[0024] According to the present invention, a highly integrated hydraulic power unit includes a one-way valve comprising a one-way valve housing, a one-way valve ball plug, a one-way valve spring, and a one-way valve base. The one-way valve housing is a hollow structure with an opening at the top and a hole at the bottom. The one-way valve base is a hollow tube structure with openings at the top and side walls, connected to the bottom of the one-way valve housing. The one-way valve spring is connected to the one-way valve base. The one-way valve ball plug is connected to the one-way valve spring and makes sealing contact with the opening at the bottom of the one-way valve housing. Its diameter is larger than the diameter of the opening at the bottom of the one-way valve housing but smaller than the diameter of the one-way valve base.

[0025] According to the present invention, a highly integrated hydraulic power unit is provided, wherein the one-way valve housing is further provided with an expansion sleeve.

[0026] According to the present invention, a highly integrated hydraulic power unit includes a hydraulic buffer accumulator comprising a bellows, an accumulator cover plate, a limiting base, an accumulator housing, and a sealing pin. One end of the bellows is connected to the accumulator cover plate, and the other end is connected to the limiting base. The limiting base includes a limiting post located inside the bellows, and the limiting base has an oil passage extending from top to bottom along its own axis. The accumulator housing is connected to the limiting base, and has an opening at its top. The sealing pin is used to seal and weld the opening at the top of the accumulator housing.

[0027] According to the present invention, a highly integrated hydraulic power unit is provided, wherein a guide ring is provided on the outer side of the connection position between the bellows and the accumulator cover plate, and the guide ring can move up and down along the inner wall of the accumulator housing.

[0028] According to the present invention, a highly integrated hydraulic power unit is provided, wherein a sealing gasket is connected to the bottom of the accumulator cover plate, and the area of ​​the sealing gasket is larger than the cross-sectional area of ​​the oil passage of the limiting base.

[0029] The advantages of this utility model are:

[0030] 1. Compared with traditional products, the hydraulic power unit of this utility model has the advantages of small size, compact structure, high integration, fewer failure points, and low cost.

[0031] 2. In this utility model, the temperature sensor is placed at the lower end of the oil tank where it connects to the hydraulic valve block. The temperature sensor is close to the connection between the oil tank and the hydraulic valve block, so the temperature detection results are more timely and accurate.

[0032] 3. The hydraulic valve block of this utility model is connected to a pressure sensor, which can monitor the oil pressure in the hydraulic oil circuit inside the hydraulic valve block in real time, providing technicians with a window to view the real-time working status of the hydraulic power unit.

[0033] 4. The hydraulic valve block of this utility model is equipped with a silencer valve at the oil return port of the assembly. The silencer valve can reduce the noise generated when the hydraulic power unit returns oil.

[0034] 5. The hydraulic gear pump of this utility model can be quickly connected to motors of different power through a coupling;

[0035] 6. When machining the hydraulic oil circuit and return oil circuit of the hydraulic valve block, holes will be left on the outer wall of the hydraulic valve block. This utility model inserts a plugging ball plug into these holes with an interference fit, which is not only low in cost, but also simple to process and operate.

[0036] 7. The hydraulic valve block of this utility model is provided with multiple weight-reducing grooves, which can effectively reduce the weight of the hydraulic valve block and is conducive to the lightweighting of the product.

[0037] 8. The hydraulic valve block of this utility model is also provided with shock-absorbing bolt mounting grooves on both sides. After the shock-absorbing bolts are installed in the shock-absorbing bolt mounting grooves, the vibration generated by the hydraulic valve block during operation can be effectively reduced, and the stability of the product operation can be improved.

[0038] 9. The directional valve of this utility model controls the connection between the lateral oil inlet and the oil outlet of the directional valve by the cooperation of the valve sleeve and the valve core, thereby changing the direction of the oil in the hydraulic valve block. The structure is simple and reliable.

[0039] 10. The reversing valve of this utility model provides the power to push the valve core by electromagnetic induction between the electromagnetic coil and the electromagnet. The structure is simple and compact, which is conducive to the weight reduction of the product and expands the application scenarios of the product.

[0040] 11. The valve sleeve of the directional valve of this utility model is provided with a sealing ring at the connection between the valve sleeve and the hydraulic valve block, which can effectively prevent the oil in the hydraulic valve block from leaking.

[0041] 12. This utility model's one-way valve achieves unidirectional flow of oil within the valve through a simple design of a one-way valve ball plug and a one-way valve spring, while maintaining a small overall size. Its simple structure greatly improves the product's integration.

[0042] 13. The one-way valve of this utility model has an expansion sleeve inside the one-way valve housing. The pressing of the expansion sleeve can make the one-way valve stably engaged in the hydraulic oil circuit at the oil inlet of the hydraulic valve block assembly, thus ensuring the working stability of the one-way valve.

[0043] 14. The hydraulic buffer accumulator of this utility model has a simple structure. When the oil pressure in the hydraulic circuit is too high, the hydraulic buffer accumulator can store and dissipate part of the oil pressure in the hydraulic circuit, so as to avoid damage to other components caused by excessive oil pressure in the hydraulic circuit.

[0044] 15. The guide ring of the hydraulic buffer accumulator of this utility model can guide the accumulator cover plate to move up and down along the axis of the hydraulic buffer accumulator, so as to avoid the accumulator cover plate swaying left and right in the accumulator shell when it moves up and down, which would reduce the energy storage effect of the hydraulic buffer accumulator.

[0045] 16. The bottom of the accumulator cover plate of this utility model is connected with a sealing gasket. The sealing gasket can enhance the sealing between the accumulator cover plate and the oil passage of the limiting base, and ensure the energy storage efficiency of the hydraulic buffer accumulator. Attached Figure Description

[0046] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the overall structure of the hydraulic power unit of this utility model;

[0048] Figure 2 This is an exploded structural diagram of the hydraulic power unit of this utility model;

[0049] Figure 3 This is a schematic diagram of the hydraulic gear pump of this utility model;

[0050] Figure 4 This is a schematic diagram of the structure of the hydraulic valve block of this utility model;

[0051] Figure 5 This is a schematic diagram of the hydraulic valve block of this utility model from another angle;

[0052] Figure 6 This is a cross-section of the hydraulic valve block of this utility model and a schematic diagram of the hydraulic oil circuit during pumping.

[0053] Figure 7 This is a cross-section of the hydraulic valve block of this utility model and a schematic diagram of the return oil circuit during oil return.

[0054] Figure 8 This is a cross-sectional structural diagram of the reversing valve of this utility model;

[0055] Figure 9 This is a cross-sectional structural diagram of the one-way valve of this utility model;

[0056] Figure 10 This is a cross-sectional structural diagram of the hydraulic buffer accumulator of this utility model;

[0057] Figure 11 This is the hydraulic circuit diagram of this utility model;

[0058] Wherein: 1-Motor; 2-Hydraulic valve block assembly; 3-Hydraulic gear pump; 301-Hydraulic gear pump inlet; 302-Hydraulic gear pump outlet; 4-Hydraulic buffer accumulator; 41-Bellowette; 42-Accumulator cover; 43-Limit base; 44-Accumulator housing; 46-Sealing pin; 47-Sealing gasket; 48-Guide ring; 5-Oil tank; 6-Coupling; 7-Hydraulic valve block; 71-Assembly inlet; 72-Assembly return port; 73-Assembly outlet; 74-Weight reduction groove; 75-Shock damping bolt Mounting slot; - Hydraulic oil circuit; - Return oil circuit; 8- Directional control valve; 81- Solenoid coil; 82- Electromagnet; 83- Push rod; 84- Directional control valve spring; 85- Valve core; 86- Valve sleeve; 87- Sealing ring; 801- Side inlet of directional control valve; 802- Outlet of directional control valve; 9- Check valve; 91- Check valve body; 92- Expansion sleeve; 93- Check valve ball plug; 94- Check valve spring; 95- Check valve base; 10- Pressure sensor; 11- Silencer valve; 12- Temperature sensor; 13- Leak-proof ball plug. Detailed Implementation

[0059] The embodiments of this utility model are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0060] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] This utility model relates to a highly integrated hydraulic power unit. This unit employs a DC motor drive and a highly integrated gear pump unit. Instead of the traditional bulky electromagnetic directional valve and external check valve, it incorporates a built-in pipeline check valve and a smaller external solenoid directional valve within the hydraulic valve block. Compared to traditional hydraulic power units, this unit is smaller, more integrated, has fewer potential failure points, and is less expensive.

[0063] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0064] A highly integrated hydraulic power unit, specifically, such as Figure 1 , 2 As shown in Figures 3, 4, and 5, including:

[0065] Motor 1, which provides power to the hydraulic power unit;

[0066] Oil tank 5 is used to supply oil to the hydraulic power unit;

[0067] Hydraulic valve block assembly 2 includes hydraulic valve block 7, directional valve 8, check valve 9, and hydraulic buffer accumulator 4. One end of hydraulic valve block 7 is connected to motor 1, and the other end is connected to oil tank 5. Hydraulic valve block 7 is provided with assembly inlet 71, assembly outlet 73, and assembly return port 72. Assembly inlet 71 and assembly outlet 73 are connected through hydraulic oil circuit, and assembly outlet 73 and assembly return port 72 are connected through return oil circuit. Directional valve 8 is connected to hydraulic valve block 7. Check valve 9 is installed at assembly inlet 71 of hydraulic valve block 7. Hydraulic buffer accumulator 4 is connected to hydraulic valve block 7 on the opposite side of directional valve 8. The internal oil passage of check valve 9 is connected to hydraulic oil circuit, the internal oil passage of hydraulic buffer accumulator 4 is connected to hydraulic oil circuit, and the internal oil passage of directional valve 8 is connected to hydraulic oil circuit and return oil circuit.

[0068] The hydraulic gear pump 3 is located inside the oil tank 5 and is connected to the hydraulic valve block 7. Its input end is connected to the output end of the motor 1. The hydraulic gear pump 3 includes a hydraulic gear pump inlet 301 and a hydraulic gear pump outlet 302. The hydraulic gear pump inlet 301 is connected to the oil tank 5. The hydraulic gear pump outlet 302 is connected to the assembly inlet 71 on the hydraulic valve block 7.

[0069] Specifically, motor 1 is a DC brushed motor, or a brushless motor, the effect is the same. Motor 1 is installed on the left side of hydraulic valve block 7 and connected to hydraulic valve block 7 by bolts. The output end of motor 1 is located inside hydraulic valve block 7. Hydraulic gear pump 3 is an external meshing gear pump with a floating bushing compensation structure and is connected to hydraulic valve block 7 on the right side by bolts. Oil tank 5 is installed on the right side of hydraulic valve block assembly 2 and connected to hydraulic valve block 7 by bolts. Hydraulic gear pump 3 is located inside oil tank 5, and its input end is connected to the output end of motor 1.

[0070] In actual operation, the directional valve 8 can control the connectivity between the hydraulic oil circuit and the return oil circuit:

[0071] like Figure 6 As shown, when the hydraulic gear pump 3 is working and pumping oil, the reversing valve 8 cuts off the connection of its internal oil passage. At this time, the hydraulic oil circuit in the hydraulic valve block 7 is disconnected from the return oil circuit, and the oil flows from the assembly inlet 71 to the assembly outlet 73 along the hydraulic oil circuit.

[0072] like Figure 7 As shown, when the oil needs to flow back, the hydraulic gear pump 3 stops working, and the directional valve 8 opens its internal oil passage. At this time, the hydraulic oil circuit in the hydraulic valve block 7 and the return oil circuit are connected through the internal oil passage of the directional valve 8. The oil then flows from the assembly outlet 73 back to the internal oil passage of the directional valve 8 along the hydraulic oil circuit. Due to its own gravity, the oil flows further downward to the return oil circuit and finally flows to the assembly return oil port 72.

[0073] In actual operation, the one-way valve 9 ensures that the oil can only flow from the assembly inlet 71 to the hydraulic circuit in a one-way manner.

[0074] like Figure 4 , 6 As shown, when the hydraulic gear pump 3 is working and pumping oil, the oil enters from the assembly inlet 71 and flows to the hydraulic circuit through the check valve 9.

[0075] like Figure 4 , 7 As shown, when the oil flows back, after the hydraulic fluid passes through the internal oil passage of the directional valve 8, if a small portion of the oil enters the hydraulic circuit, it will be blocked by the check valve 9 to prevent the oil from entering the assembly inlet 71.

[0076] In actual operation, the hydraulic buffer accumulator 4 can buffer the pressure pulsation of the hydraulic gear pump 3:

[0077] like Figure 6 As shown, when the hydraulic gear pump 3 is working and pumping oil, the oil enters from the assembly inlet 71. When the oil pressure is too high, some of the oil will enter the hydraulic buffer accumulator 4, thereby reducing the overall oil pressure.

[0078] In some embodiments, such as Figure 1 , 2 As shown, the oil tank 5 described above has been optimized. In this embodiment, a temperature sensor 12 is also connected to the part of the oil tank 5 that is connected to the hydraulic valve block 7.

[0079] In actual operation, the temperature sensor 12 is closer to the connection between the oil tank 5 and the hydraulic valve block 7. When it monitors the oil temperature in the oil tank 5 in real time, the detection results are more timely and accurate. When the oil temperature is too high, the temperature sensor 12 will issue an alarm to notify the technicians to stop the operation of the hydraulic power unit.

[0080] In some embodiments, such as Figure 2 As shown, the hydraulic valve block assembly 2 described above has been optimized. In this embodiment, the hydraulic valve block assembly 2 also includes a pressure sensor 10, which is connected to the hydraulic valve block 7 and has its internal oil passage connected to the hydraulic oil circuit.

[0081] In actual operation, the pressure sensor 10 can monitor the oil pressure in the hydraulic circuit of the hydraulic valve block 7 in real time, providing technicians with a window to view the real-time operation of the hydraulic power unit and providing quantitative indicators for technicians to adjust the working power of the motor 1 in real time.

[0082] In some embodiments, such as Figure 4 As shown, the hydraulic valve block 7 described above has been optimized. In this embodiment, a silencer valve 11 is provided at the assembly return port 72 on the hydraulic valve block 7.

[0083] In actual operation, the silencer valve 11 can dissipate the oil pressure and impact force of the returning oil: such as Figure 4 , 7 As shown, when the oil flows back, it enters the silencer valve 11 through the return oil passage. The outlet of the silencer valve 11 is an opening with multiple small diameter holes. When the oil passes through, the pressure and impact force will be greatly reduced, thereby avoiding the impact on the hydraulic gear pump 3 when the oil exits the assembly return port 72. At the same time, the silencer valve 11 can also reduce the noise generated by the return oil, thereby reducing the noise when the product is working.

[0084] In some embodiments, such as Figure 4 , 5 As shown, the hydraulic valve block 7 described above has been optimized. In this embodiment, the hydraulic valve block 7 is also provided with a coupling 6, which is used to connect the output end of the motor 1 and the input end of the hydraulic gear pump 3.

[0085] In actual operation, when the oil pressure demand is high, if the maximum power of motor 1 is insufficient to meet the demand, hydraulic gear pump 3 can quickly switch to motor 1 with different power through coupling 6.

[0086] Preferred, such as Figure 4 , 5 As shown, in this embodiment, a plugging ball plug 13 is provided at the connection between the hydraulic oil circuit, the return oil circuit and the outer wall of the hydraulic valve block 7.

[0087] Specifically, when machining the hydraulic oil circuit and return oil circuit of the hydraulic valve block 7, for ease of machining, drilling is performed directly from the outer wall of the hydraulic valve block 7 inward. After machining, the hydraulic oil circuit and return oil circuit will inevitably be directly connected to the outside at the machined part on the outer wall. By pressing the leak-proof ball plug 13 into the machined part on the outer wall, the direct connection between the hydraulic oil circuit and return oil circuit and the outside can be perfectly blocked, thus preventing oil leakage. Pressing the leak-proof ball plug 13 into the machined part is not only simple to operate, but also has a low cost.

[0088] Preferred, such as Figure 4 , 5 As shown, in this embodiment, the hydraulic valve block 7 is also provided with multiple weight reduction grooves 74.

[0089] Specifically, a weight-reducing groove 74 is provided on the hydraulic valve block 7, which can effectively reduce the weight of the hydraulic valve block 7 and is conducive to the lightweighting of the product.

[0090] Preferred, such as Figure 4 , 5 As shown, in this embodiment, the hydraulic valve block 7 is also provided with shock-absorbing bolt mounting grooves 75 on both sides.

[0091] In actual operation, after the shock-absorbing bolts are installed in the shock-absorbing bolt mounting slot 75, the vibration generated by the hydraulic valve block 7 during operation can be effectively reduced, thus improving the stability of the product.

[0092] In some embodiments, such as Figure 8 As shown, the aforementioned directional valve 8 has been optimized. In this embodiment, the directional valve 8 includes a valve sleeve 86 and a valve core 85. The valve sleeve 86 is a hollow tube structure with a directional valve side inlet 801 on its side wall and a directional valve outlet 802 on its end. The directional valve side inlet 801 is connected to the hydraulic oil circuit; the directional valve outlet 802 is connected to the return oil circuit; the valve core 85 is located inside the valve sleeve 86, and its diameter is equal to the inner diameter of the valve sleeve 86, allowing it to move axially within the valve sleeve 86.

[0093] Preferred, such as Figure 8 As shown, in this embodiment, the reversing valve 8 also includes an electromagnetic coil 81, an electromagnet 82, a push rod 83, and a reversing valve spring 84. The electromagnetic coil 81 is sleeved on the outer periphery of the electromagnet 82; the push rod 83 is connected to the electromagnet 82; and the reversing valve spring 84 connects the push rod 83 and the valve core 85.

[0094] Preferred, such as Figure 8As shown, in this embodiment, the valve sleeve 86 is connected to the hydraulic valve block 7, and a sealing ring 87 is provided at the connection between the valve sleeve 86 and the hydraulic valve block 7.

[0095] In actual operation, the reversing valve 8 is connected to the hydraulic valve block 7 by threads, and the sealing ring 87 contacts and seals the inner hole of the hydraulic valve block 7, dividing the reversing valve 8 into a reversing valve side oil inlet 801 and a reversing valve oil outlet 802.

[0096] When the reversing valve 8 is energized, the electromagnetic coil 81 is energized to generate electromagnetic force. The electromagnetic force pushes the electromagnet 82 to move to the right, compresses the reversing valve spring 84 and pushes the valve core 85 to move to the right, and forms a seal with the right side of the reversing valve oil outlet 802, cutting off the connection between the reversing valve side oil inlet 801 and the reversing valve oil outlet 802, and cutting off the oil flow between the two.

[0097] When the solenoid valve 8 is de-energized and not working, the electromagnetic force of the solenoid coil 81 disappears, and the reversing valve spring 84 pulls the valve core 85 toward the electromagnet 82 and the push rod 83, and the reversing valve side oil inlet 801 and the reversing valve oil outlet 802 are connected. At this time, the oil can flow between the reversing valve side oil inlet 801 and the reversing valve oil outlet 802.

[0098] The diameter of the oil outlet 802 of the reversing valve is designed to be easily changeable. The diameter of the hole can be changed as required. This hole can generate a damping effect. By changing the diameter of the hole, the oil flow speed of the system can be changed, which can control the moving speed of external components. This makes it easy to match different product requirements and facilitates platformization and standardization.

[0099] In some embodiments, such as Figure 9 As shown, the one-way valve 9 described above has been optimized. In this embodiment, the one-way valve 9 includes a one-way valve housing 91, a one-way valve ball plug 93, a one-way valve spring 94, and a one-way valve base 95. The one-way valve housing 91 is a hollow structure with an opening at the top and a hole at the bottom. The one-way valve base 95 is a hollow tube structure with openings at the top and side walls, connected to the bottom of the one-way valve housing 91. The one-way valve spring 94 is connected to the one-way valve base 95. The one-way valve ball plug 93 is connected to the one-way valve spring 94 and makes sealing contact with the opening at the bottom of the one-way valve housing 91. Its diameter is larger than the diameter of the opening at the bottom of the one-way valve housing 91 and smaller than the diameter of the one-way valve base 95.

[0100] Preferred, such as Figure 8 As shown, in this embodiment, a sleeve 92 is also provided inside the one-way valve housing 91.

[0101] In fact, the one-way valve 9 uses a press-fit structure. After being placed in the mounting hole, the expansion sleeve 92 is pressed into the one-way valve body 91, which expands the one-way valve body 91 and is fixed and sealed by squeezing the inner wall of the mounting hole.

[0102] The working process of check valve 9 is as follows: The upper end of check valve 9 is the assembly inlet 71, which is connected to the outlet of gear pump 3. Gear pump 3 pumps high-pressure oil to the assembly inlet 71. The pressure oil pushes the check valve ball plug 93. The check valve ball plug 93 moves downward from the sealing right angle position to compress the check valve spring 94. At this time, the internal oil passage of check valve 9 is opened, and oil enters from the upper end of check valve 9 and is discharged from the opening on the side wall of check valve base 95 to the hydraulic oil passage. Check valve 9 is placed at the assembly inlet 71 of hydraulic valve block 7 to control the oil to flow in only one direction and protect gear pump 3 from reverse pressure impact.

[0103] In some embodiments, such as Figure 10 As shown, the hydraulic buffer accumulator 4 described above has been optimized. In this embodiment, the hydraulic buffer accumulator 4 includes a bellows 41, an accumulator cover plate 42, a limiting base 43, an accumulator housing 44, and a sealing pin 46. One end of the bellows 41 is connected to the accumulator cover plate 42, and the other end is connected to the limiting base 43. The limiting base 43 includes a limiting post located inside the bellows 41. The limiting base 43 has an oil passage running through it from top to bottom along its own axis. The accumulator housing 44 is connected to the limiting base 43, and its top has an opening. The sealing pin 46 is used to seal the opening at the top of the accumulator housing 44.

[0104] Preferred, such as Figure 10 As shown, in this embodiment, a guide ring 48 is provided on the outer side of the connection position between the bellows 41 and the accumulator cover plate 42. The guide ring 48 can move up and down along the inner wall of the accumulator housing 44.

[0105] Preferred, such as Figure 10 As shown, in this embodiment, a sealing gasket 47 is connected to the bottom of the accumulator cover plate 42, and the area of ​​the sealing gasket 47 is larger than the cross-sectional area of ​​the oil passage of the limiting base 43.

[0106] In fact, there is a cavity between the accumulator housing 44 and the bellows 41. A small hole is left in the middle of the top of the accumulator housing 44. After the cavity is filled with air through the small hole, it is sealed by welding with the sealing pin 46 to seal the cavity, thus forming a gas storage element for use as an accumulator.

[0107] When the chamber is filled with air, when the bellows 41 is deformed under pressure to the compression limit, the sealing gasket 47 reaches the upper surface of the limiting base 43. The limiting base 43 and the sealing gasket 47 form a seal, sealing the pressure fluid in the inner cavity of the bellows 41. This can maintain the pressure on both sides of the bellows 41, so that there is no pressure difference between the inside and outside, and prevent the bellows 41 from experiencing pressure failure.

[0108] In addition, when the bellows 41 is running inside the accumulator housing 44, the guide ring 48 can keep the accumulator cover plate 42 and the bellows 41 running in a straight line, so that they will not sway left or right and come into contact with the inner wall of the accumulator housing 44 and be damaged, thus improving the life of the buffer accumulator 4.

[0109] like Figure 11 As shown, the working principle of the hydraulic power unit of this utility model is as follows:

[0110] When motor 1 is turned on, the output of motor 1 transmits power to hydraulic gear pump 3 through coupling 6. Hydraulic gear pump inlet 301 begins to draw oil. After being pressurized by hydraulic gear pump 3, the oil is sprayed out from hydraulic gear pump outlet 302 and enters assembly inlet 71. After passing through check valve 9, it flows into hydraulic oil circuit and then to hydraulic buffer accumulator 4. After depressurization, the oil passes through reversing valve 8 along hydraulic oil circuit. At this time, reversing valve 8 is energized and closed, and the oil flows further in hydraulic oil passage. After passing through pressure sensor 10, it finally flows out from assembly outlet 73 to the system's active element. High-pressure oil flows to the system's active element through assembly outlet 101.

[0111] When the system is depressurized, the motor 1 is de-energized and stops working, and the hydraulic gear pump 3 also stops working. The assembly outlet 73 is also the inlet of the hydraulic system when returning oil. At this time, the directional valve 8 is de-energized and opens. The directional valve side inlet 801 is connected to the directional valve outlet 802. The directional valve outlet 802 is connected to the system return oil circuit. The return oil flows into the return oil circuit after passing through the directional valve 8. Finally, after passing through the silencer valve 11 to silence and depressurize, it flows out from the assembly return oil outlet 72 and returns to the oil tank 5.

[0112] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A highly integrated hydraulic power unit, characterized in that, include: The motor (1) is used to provide power to the hydraulic power unit; Oil tank (5), which is used to supply oil to the hydraulic power unit; The hydraulic valve block assembly (2) includes a hydraulic valve block (7), one end of which is connected to the motor (1) and the other end is connected to the oil tank (5). The hydraulic valve block (7) is provided with an assembly inlet (71), an assembly outlet (73), and an assembly return port (72). The assembly inlet (71) and the assembly outlet (73) are connected through a hydraulic oil circuit, and the assembly outlet (73) and the assembly return port (72) are connected through a return oil circuit. The hydraulic valve block assembly (2) also includes a directional valve (8), a check valve (9), and a hydraulic buffer accumulator (4). The directional valve (8) is integrated on the hydraulic valve block (7). The check valve (9) is installed in the assembly inlet (71) of the hydraulic valve block (7). The hydraulic buffer accumulator (4) is integrated on the hydraulic valve block (7) on the opposite side of the directional valve (8). A hydraulic gear pump (3) is located inside the oil tank (5) and connected to the hydraulic valve block (7). Its input end is connected to the output end of the motor (1). The hydraulic gear pump (3) includes a hydraulic gear pump inlet (301) and a hydraulic gear pump outlet (302). The hydraulic gear pump inlet (301) is connected to the oil tank (5). The hydraulic gear pump outlet (302) is connected to the assembly inlet (71) on the hydraulic valve block (7).

2. The highly integrated hydraulic power unit according to claim 1, characterized in that, The check valve (9) is a highly integrated built-in check valve. The check valve (9) is installed in the hydraulic oil circuit of the hydraulic valve block (7) and is connected to the oil inlet (71) of the assembly.

3. The highly integrated hydraulic power unit according to claim 1, characterized in that, The hydraulic circuit is connected to the assembly inlet (71) of the hydraulic valve block (7), the internal oil passage of the check valve (9), the internal oil passage of the hydraulic buffer accumulator (4), and the assembly outlet (73) of the hydraulic valve block (7).

4. The highly integrated hydraulic power unit according to claim 1, characterized in that, The return oil circuit is connected to the assembly outlet (73) of the hydraulic valve block (7), the internal oil passage of the hydraulic buffer accumulator (4), the internal oil passage of the reversing valve (8), and the assembly outlet (73) of the hydraulic valve block (7).

5. A highly integrated hydraulic power unit according to claim 3 or 4, characterized in that, The hydraulic oil circuit and the return oil circuit share a common oil circuit, which connects the assembly outlet (73) of the hydraulic valve block (7) with the internal oil passage of the hydraulic buffer accumulator (4).

6. The highly integrated hydraulic power unit according to claim 1, characterized in that, A temperature sensor (12) is also connected to the part of the oil tank (5) that is connected to the hydraulic valve block (7).

7. The highly integrated hydraulic power unit according to claim 1, characterized in that, The hydraulic valve block assembly (2) also includes a pressure sensor (10), which is connected to the hydraulic valve block (7) and its internal oil passage is connected to the internal oil passage of the hydraulic valve block (7).

8. The highly integrated hydraulic power unit according to claim 1, characterized in that, A silencer valve (11) is connected to the assembly return port (72) on the hydraulic valve block (7).

9. A highly integrated hydraulic power unit according to claim 1, characterized in that, The hydraulic valve block (7) is also provided with multiple weight reduction grooves (74).

10. A highly integrated hydraulic power unit according to claim 1, characterized in that, The hydraulic valve block (7) is also provided with shock-absorbing bolt mounting grooves (75) on both sides.

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