An oil-immersed motor-pump integrated hydraulic power unit

Abstract

An oil-immersed motor-pump integrated hydraulic power unit relates to the technical field of hydraulic pumps. The present invention solves the problems of the existing hydraulic power units, such as large volume, complex structure, low integration level, high noise, and potential external leakage. In the present invention, the valve plate, the plunger pump cylinder block, and the swash plate are successively inserted into the valve block assembly holes of the hydraulic pump valve block from front to back. The front ends of multiple pistons are respectively inserted into multiple plunger cavities, and the rear ends of multiple pistons are respectively connected to the front end of the swash plate through multiple slipper shoes. The rear end of the swash plate is connected to the front end of the motor assembly. One end of the valve plate cavity is communicated with the plunger cavity through a diversion hole, and the other end of the valve plate cavity is communicated with the high-pressure end outlet assembly and the oil return check valve. The transmission shaft successively passes through the valve plate, the plunger pump cylinder block, and the swash plate from front to back. The front end of the transmission shaft is rotatably connected to the valve plate, and the middle part of the transmission shaft is fixedly connected to the plunger pump cylinder block. The present invention is used to reduce the volume and weight of the hydraulic power unit, improve the protection level, and reduce the noise.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and particularly relates to an oil-immersed motor-pump integrated hydraulic power unit. Background Art

[0002] The hydraulic power unit is the core of the hydraulic power system. Currently, most of the power units with an electric motor as the prime mover are of a split structure, which is composed of components such as an electric motor, a coupling, a hydraulic pump, and a fuel tank connected in series. This results in problems such as a large volume, a complex structure, and being unfavorable for system integration of the hydraulic power unit. In addition, since the dynamic sealing method is used to seal the hydraulic oil in the power unit, there are problems of high noise and a potential risk of external leakage.

[0003] In summary, the existing hydraulic power units have problems of a large volume, a complex structure, a low integration level, high noise, and a potential external leakage. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of the existing hydraulic power units, such as a large volume, a complex structure, a low integration level, high noise, and a potential external leakage, and further provide an oil-immersed motor-pump integrated hydraulic power unit.

[0005] The technical solution of the present invention is as follows:

[0006] An oil-immersed motor-pump integrated hydraulic power unit, which comprises a swash plate type piston pump assembly 1, a motor assembly 2 and a pump body assembly 3. The pump body assembly 3 includes a hydraulic pump valve block 301, a high-pressure end outlet assembly 302 and a check valve 303 for oil return. The high-pressure end outlet assembly 302 and the check valve 303 for oil return are installed at the front part of the hydraulic pump valve block 301. A valve block assembly hole is opened at the rear part of the hydraulic pump valve block 301. The swash plate type piston pump assembly 1 includes a valve plate 101, a piston pump cylinder block 102, a swash plate 105, a plurality of pistons 103 and a plurality of slipper shoes 104. The valve plate 101, the piston pump cylinder block 102 and the swash plate 105 are sequentially inserted into the valve block assembly hole of the hydraulic pump valve block 301 from front to back. A plurality of axially arranged plunger cavities are evenly opened at the rear side of the piston pump cylinder block 102 along the circumferential direction. The front ends of the plurality of pistons 103 are respectively inserted into the plurality of plunger cavities. The rear ends of the plurality of pistons 103 are respectively connected with the front end of the swash plate 105 through the plurality of slipper shoes 104. The rear end of the swash plate 105 is connected with the front end of the motor assembly 2. A plurality of diversion holes corresponding to the plurality of plunger cavities one by one are machined on the front side end face of the piston pump cylinder block 102. A valve plate cavity corresponding to the diversion holes is arranged inside the valve plate 101. One end of the valve plate cavity is communicated with the plunger cavity through the diversion hole, and the other end of the valve plate cavity is communicated with the high-pressure end outlet assembly 302 and the check valve 303 for oil return. The motor assembly 2 includes a transmission shaft 203. The transmission shaft 203 sequentially passes through the valve plate 101, the piston pump cylinder block 102 and the swash plate 105 from front to back. The front end of the transmission shaft 203 is rotationally connected with the valve plate 101, and the middle part of the transmission shaft 203 is fixedly connected with the piston pump cylinder block 102.

[0007] Further, the motor assembly 2 further includes a motor stator 201, a motor rotor 202 and a motor valve block 204. The rear end of the transmission shaft 203 is rotatably installed on the motor valve block 204. The motor stator 201 is fixedly installed on the motor valve block 204. The motor rotor 202 is sleeved outside the motor stator 201. A rotor end plate with a through hole opened at the center is arranged at the front end of the motor rotor 202. A circular flange is arranged at the middle and rear part of the transmission shaft 203. The circular flange is fixedly connected with the rotor end plate of the motor rotor 202 through a plurality of connecting elements.

[0008] Further, the pump body assembly 3 further includes an overflow valve 304, a fan 305, a power unit drive module housing 306, a motor drive module housing 307 and a rear housing 308. The overflow valve 304 and the fan 305 are respectively installed on the left and right sides of the hydraulic pump valve block 301. The overflow valve 304 is communicated with the high-pressure end outlet assembly 302 and the check valve 303 for oil return. The fan 305 is arranged opposite to the motor assembly 2. Installation slots for the power unit drive module and the motor drive module are respectively arranged above and below the hydraulic pump valve block 301. The power unit drive module housing 306 and the motor drive module housing 307 are respectively installed on the upper and lower sides of the hydraulic pump valve block 301. The rear housing 308 is installed at the rear part of the hydraulic pump valve block 301.

[0009] Furthermore, it further includes a drive control module 4, and the drive control module 4 includes a power unit drive module 401, a motor drive module 402, a system sensing module 403, and an input / output module 404. The power unit drive module 401 is installed in the power unit drive module installation slot above the hydraulic pump valve block 301, the motor drive module 402 is installed in the motor drive module installation slot below the hydraulic pump valve block 301, and both the system sensing module 403 and the input / output module 404 are installed on the hydraulic pump valve block 301.

[0010] Furthermore, the system sensing module 403 includes a pressure sensor, a temperature sensor, a magnetic angle sensor, a magnet, and a magnet fixing seat. Two groups of first sensor installation holes are provided on the hydraulic pump valve block 301, and the pressure sensor and the temperature sensor are respectively inserted into the two groups of first sensor installation holes. The measuring ends of the pressure sensor and the temperature sensor are both in contact with the hydraulic oil in the high-pressure end outlet assembly 302 and the check valve 303 for oil return. A horizontally arranged second sensor installation hole is provided on the side of the hydraulic pump valve block 301, and the magnetic angle sensor is inserted into the second sensor installation hole. The measuring end of the magnetic angle sensor is arranged opposite to the transmission shaft 203. A magnet assembly hole is provided at the center of the rear end of the transmission shaft 203, the magnet is installed in the magnet assembly hole, the magnet fixing seat is buckled on the magnet, and the magnet fixing seat is fixedly connected to the rear end face of the motor valve block 204 through a connecting element.

[0011] Furthermore, the input / output module 404 includes a power connector and two aviation plugs. Two groups of plug installation holes are provided on the hydraulic pump valve block 301, and the two aviation plugs are respectively inserted into the two groups of plug installation holes. The aviation plugs and the relief valve 304 are on the same side, and the power connector is installed on the hydraulic pump valve block 301.

[0012] Furthermore, the swash plate type piston pump assembly 1 further includes a first sealing ring 106. A radially arranged first annular groove is machined on the outer side surface of the front end of the distribution plate 101 along the circumferential direction, and the first sealing ring 106 is installed in the first annular groove. The distribution plate 101 is in sealing cooperation with the hydraulic pump valve block 301 through the first sealing ring 106.

[0013] Furthermore, the motor assembly 2 further includes a second sealing ring 205. A radially arranged second annular groove is machined on the outer side surface of the rear end of the motor valve block 204 along the circumferential direction, and the second sealing ring 205 is installed in the second annular groove. The motor valve block 204 is in sealing cooperation with the hydraulic pump valve block 301 through the second sealing ring 205.

[0014] Further, a port plate shaft hole is formed in the center of the port plate 101, a through spline hole of the cylinder block is formed in the center of the cylinder block 102 of the piston pump, a swash plate avoidance hole is formed in the center of the swash plate 105, the front end of the transmission shaft 203 is inserted into the port plate shaft hole, the spline hole of the cylinder block and the swash plate avoidance hole in sequence from front to back, the front end of the transmission shaft 203 is rotatably connected with the port plate 101 through a bearing, splines matching the spline hole of the cylinder block are machined in the middle of the transmission shaft 203, a spline pair connection is adopted between the middle of the transmission shaft 203 and the cylinder block 102 of the piston pump, and the rear end of the transmission shaft 203 is fixedly connected with the motor rotor 202.

[0015] Further, each slipper 104 includes a slipper body and a plunger ball head. A ball socket is provided at the front end of the slipper body, the plunger ball head is fitted in the ball socket of the slipper body, and the plunger ball head is connected with the corresponding piston 103.

[0016] The present invention has the following effects compared with the prior art:

[0017] 1. The hydraulic power unit of the present invention adopts an integrated power unit. The overall structure of the swash plate type piston pump assembly of the present invention is completely installed inside the hydraulic pump valve block, and the front end of the transmission shaft in the motor assembly is inserted into the port plate shaft hole, the spline hole of the cylinder block and the swash plate avoidance hole in sequence from front to back. The front end of the transmission shaft 203 is rotatably connected with the port plate 101 through a bearing, a spline pair connection is adopted between the middle of the transmission shaft and the cylinder block of the piston pump, and the rear end of the transmission shaft is fixedly connected with the motor rotor. Therefore, only the structures of the motor stator, the motor rotor and the motor valve block are located outside the hydraulic pump valve block. Therefore, the volume and weight of the hydraulic power unit can be greatly reduced. The transmission shaft of the present invention is driven by the motor rotor to rotate together. Driven by the transmission shaft, the cylinder block of the piston pump rotates circumferentially inside the hydraulic pump valve block. The piston and the slipper rotate together with the cylinder block of the piston pump. Since the slipper is matched with the swash plate, the piston connected thereto performs both radial rotation and axial movement. When the piston performs axial movement, it can complete the suction and discharge of hydraulic oil through the port plate, and its period is the same as the rotation period of the transmission shaft. The high-pressure end outlet assembly and the oil return check valve realize the suction and discharge of hydraulic oil through the port plate. Therefore, it has the advantages of small volume, light weight, simple structure and high integration.

[0018] 2. The oil-immersed motor pump integrated hydraulic power unit of the present invention has the advantage of high protection level. The overflow valve of the present invention is fixed on the side of the hydraulic pump valve block, and the overflow valve is communicated with the high-pressure end outlet assembly and the oil return check valve, and when the oil outlet pressure is higher than the set value, it flows into the oil return oil circuit.

[0019] 3. The present invention effectively solves the problem of potential external leakage in the existing hydraulic power unit and has the advantage of low noise. The distribution disk and the motor valve block of the present invention respectively seal the hydraulic oil with the hydraulic pump valve block through the first sealing ring and the second sealing ring. Through the sealing at both ends, all internal parts are immersed in the hydraulic oil, and there is no dynamic seal in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an axonometric view of an oil-immersed motor-pump integrated hydraulic power unit of the present invention;

[0021] Figure 2 is an assembly drawing of an oil-immersed motor-pump integrated hydraulic power unit of the present invention;

[0022] Figure 3 is an assembly drawing of a swash plate type piston pump assembly of an oil-immersed motor-pump integrated hydraulic power unit of the present invention;

[0023] Figure 4 is an assembly drawing of a motor assembly of an oil-immersed motor-pump integrated hydraulic power unit of the present invention;

[0024] Figure 5 is an assembly drawing of a pump body assembly of an oil-immersed motor-pump integrated hydraulic power unit of the present invention;

[0025] Figure 6 is an axonometric view of a pump body assembly of an oil-immersed motor-pump integrated hydraulic power unit of the present invention;

[0026] Figure 7 is an assembly drawing of a drive control module of an oil-immersed motor-pump integrated hydraulic power unit of the present invention.

[0027] In the figure: 1 is a swash plate type piston pump assembly; 2 is a motor assembly; 3 is a pump body assembly; 4 is a drive control module; 101 is a distribution disk; 102 is a piston pump cylinder block; 103 is a piston; 104 is a slipper; 105 is a swash plate; 106 is a first sealing ring; 201 is a motor stator; 202 is a motor rotor; 203 is a transmission shaft; 204 is a motor valve block; 205 is a second sealing ring; 301 is a hydraulic pump valve block; 302 is a high-pressure end outlet assembly; 303 is a check valve for oil return; 304 is a relief valve; 305 is a fan; 306 is a housing of the power unit drive module; 307 is a housing of the motor drive module; 308 is a rear housing; 401 is a power unit drive module; 402 is a motor drive module; 403 is a system sensing module; 404 is an input / output module. DETAILED DESCRIPTION OF THE INVENTION

[0028] DETAILED DESCRIPTION OF THE INVENTION I: In combination with Figures 1 to 7Describing this embodiment, an oil-immersed motor-pump integrated hydraulic power unit of this embodiment includes a swashplate type piston pump assembly 1, a motor assembly 2, and a pump body assembly 3. The pump body assembly 3 includes a hydraulic pump valve block 301, a high-pressure end outlet assembly 302, and a check valve 303 for oil return. The high-pressure end outlet assembly 302 and the check valve 303 for oil return are installed at the front of the hydraulic pump valve block 301. A valve block assembly hole is opened at the rear of the hydraulic pump valve block 301. The swashplate type piston pump assembly 1 includes a distribution plate 101, a piston pump cylinder block 102, a swashplate 105, a plurality of pistons 103, and a plurality of slippers 104. The distribution plate 101, the piston pump cylinder block 102, and the swashplate 105 are inserted into the valve block assembly hole of the hydraulic pump valve block 301 in sequence from front to back. A plurality of axially arranged piston chambers are evenly opened at the rear side of the piston pump cylinder block 102 along the circumferential direction. The front ends of the plurality of pistons 103 are respectively inserted into the plurality of piston chambers. The rear ends of the plurality of pistons 103 are respectively connected to the front end of the swashplate 105 through the plurality of slippers 104. The rear end of the swashplate 105 is connected to the front end of the motor assembly 2. A plurality of diversion holes corresponding to the plurality of piston chambers one by one are machined on the front side end face of the piston pump cylinder block 102. A distribution chamber corresponding to the diversion holes is provided inside the distribution plate 101. One end of the distribution chamber is communicated with the piston chamber through the diversion hole, and the other end of the distribution chamber is communicated with the high-pressure end outlet assembly 302 and the check valve 303 for oil return. The motor assembly 2 includes a transmission shaft 203. The transmission shaft 203 passes through the distribution plate 101, the piston pump cylinder block 102, and the swashplate 105 in sequence from front to back. The front end of the transmission shaft 203 is rotatably connected to the distribution plate 101, and the middle part of the transmission shaft 203 is fixedly connected to the piston pump cylinder block 102.

[0029] Wherein, the slippers 104 and the pistons 103 are installed in pairs in the piston pump cylinder block 102, and the slippers 104 cooperate with the swashplate 105.

[0030] Wherein, the distribution plate 101 and the swashplate 105 are fixed inside the hydraulic pump valve block 301.

[0031] Wherein, the high-pressure end outlet assembly 302 and the check valve 303 for oil return realize the suction and discharge of hydraulic oil through the distribution plate 101.

[0032] Specific Embodiment 2: Combining Figures 2 to 4To describe this embodiment, the motor assembly 2 of this embodiment further includes a motor stator 201, a motor rotor 202, and a motor valve block 204. The rear end of the transmission shaft 203 is rotatably installed on the motor valve block 204. The motor stator 201 is fixedly installed on the motor valve block 204. The motor rotor 202 is sleeved outside the motor stator 201. The front end of the motor rotor 202 is provided with a rotor end plate having a through hole in the center. The middle and rear parts of the transmission shaft 203 are provided with a circular flange, and the circular flange is fixedly connected to the rotor end plate of the motor rotor 202 through a plurality of connecting elements. With such a setting, the transmission shaft 203 is installed on the motor valve block 204 through bearings and spacer rings. The motor rotor 202 is fixed to the transmission shaft 203, and the motor stator 201 is fixed to the motor valve block 204. The transmission shaft 203 is driven by the motor rotor 202 to rotate together. Other components and connection relationships are the same as those in the first specific embodiment.

[0033] Specific Embodiment Three: Combining Figure 1 , Figure 2 , Figure 5 and Figure 6 To describe this embodiment, the pump body assembly 3 of this embodiment further includes an overflow valve 304, a fan 305, a power unit drive module housing 306, a motor drive module housing 307, and a rear housing 308. The overflow valve 304 and the fan 305 are respectively installed on the left and right sides of the hydraulic pump valve block 301. The overflow valve 304 is communicated with the high-pressure end outlet assembly 302 and the oil return check valve 303. The fan 305 is disposed opposite to the motor assembly 2. Installation slots for the power unit drive module and the motor drive module are respectively provided above and below the hydraulic pump valve block 301. The power unit drive module housing 306 and the motor drive module housing 307 are respectively installed on the upper and lower sides of the hydraulic pump valve block 301. The rear housing 308 is installed at the rear of the hydraulic pump valve block 301. With such a setting, the overflow valve 304 is communicated with the high-pressure end outlet assembly 302 and the oil return check valve 303, and when the oil outlet pressure is higher than the set value, it makes the oil flow into the oil return oil circuit. Other components and connection relationships are the same as those in the first or second specific embodiment.

[0034] Specific Embodiment Four: Combining Figure 2 and Figure 7Describing this embodiment, this embodiment further includes a drive control module 4. The drive control module 4 includes a power unit drive module 401, a motor drive module 402, a system sensing module 403, and an input / output module 404. The power unit drive module 401 is installed in the power unit drive module installation slot above the hydraulic pump valve block 301. The motor drive module 402 is installed in the motor drive module installation slot below the hydraulic pump valve block 301. Both the system sensing module 403 and the input / output module 404 are installed on the hydraulic pump valve block 301. With such an arrangement, the power unit drive module 401 controls the motor drive module 402, receives information from the system sensing module 403, and receives and transmits information to the input / output module 404. The motor drive module 402 controls the operation of the motor assembly 2. Other components and connection relationships are the same as those in the first, second, or third specific embodiments.

[0035] Specific Embodiment Five: Combining Figure 2 and Figure 7 Describing this embodiment, the system sensing module 403 of this embodiment includes a pressure sensor, a temperature sensor, a magnetic angle sensor, a magnet, and a magnet fixing seat. Two groups of first sensor installation holes are provided on the hydraulic pump valve block 301. The pressure sensor and the temperature sensor are respectively inserted into the two groups of first sensor installation holes. The measuring ends of the pressure sensor and the temperature sensor are both in contact with the hydraulic oil in the high-pressure end outlet assembly 302 and the check valve 303 for oil return. A horizontally arranged second sensor installation hole is provided on the side of the hydraulic pump valve block 301. The magnetic angle sensor is inserted into the second sensor installation hole. The measuring end of the magnetic angle sensor is arranged opposite to the transmission shaft 203. A magnet assembly hole is provided at the center of the rear end of the transmission shaft 203. The magnet is installed in the magnet assembly hole. The magnet fixing seat is buckled on the magnet. The magnet fixing seat is fixedly connected to the rear end face of the motor valve block 204 through a connecting element. With such an arrangement, the system sensing module 403 receives information such as the hydraulic oil pressure, temperature, and the rotation angle of the transmission shaft 203 of the power unit and transmits it to the power unit drive module 401. Other components and connection relationships are the same as those in the first, second, third, or fourth specific embodiments.

[0036] Specific Embodiment Six: Combining Figure 2 and Figure 7 Describing this embodiment, the input / output module 404 of this embodiment includes a power supply connector and two aviation plugs. Two groups of plug installation holes are provided on the hydraulic pump valve block 301. The two aviation plugs are respectively inserted into the two groups of plug installation holes. The aviation plugs and the relief valve 304 are on the same side. The power supply connector is installed on the hydraulic pump valve block 301. With such an arrangement, the input / output module 404 transmits the operation information of the power unit, receives information from the controller, and provides power for the motor assembly 2. Other components and connection relationships are the same as those in the first, second, third, fourth, or fifth specific embodiments.

[0037] Specific Embodiment Seven: In combination with Figure 3 Describe this embodiment. The swash plate type plunger pump assembly 1 of this embodiment further includes a first sealing ring 106. A radially arranged first annular groove is machined on the outer side surface of the front end of the valve plate 101 along the circumferential direction. The first sealing ring 106 is installed in the first annular groove. The valve plate 101 is in sealed cooperation with the hydraulic pump valve block 301 through the first sealing ring 106. With such a setting, the valve plate 101 and the motor valve block 204 respectively seal the hydraulic oil with the hydraulic pump valve block 301 through the first sealing ring 106 and the second sealing ring 205. Through the sealing of these two ends, all the internal parts are immersed in the hydraulic oil, and there is no dynamic seal in the system. Other compositions and connection relationships are the same as those in Specific Embodiments One, Two, Three, Four, Five, or Six.

[0038] Specific Embodiment Eight: In combination with Figure 4 Describe this embodiment. The motor assembly 2 of this embodiment further includes a second sealing ring 205. A radially arranged second annular groove is machined on the outer side surface of the rear end of the motor valve block 204 along the circumferential direction. The second sealing ring 205 is installed in the second annular groove. The motor valve block 204 is in sealed cooperation with the hydraulic pump valve block 301 through the second sealing ring 205. With such a setting, the valve plate 101 and the motor valve block 204 respectively seal the hydraulic oil with the hydraulic pump valve block 301 through the first sealing ring 106 and the second sealing ring 205. Through the sealing of these two ends, all the internal parts are immersed in the hydraulic oil, and there is no dynamic seal in the system. Other compositions and connection relationships are the same as those in Specific Embodiments One, Two, Three, Four, Five, Six, or Seven.

[0039] Specific Embodiment Nine: In combination with Figure 3 and Figure 4 Describe this embodiment. A valve plate shaft hole is opened in the center of the valve plate 101 of this embodiment. A through cylinder spline hole is opened in the center of the plunger pump cylinder block 102. A swash plate avoidance hole is opened in the center of the swash plate 105. The front end of the transmission shaft 203 is sequentially inserted into the valve plate shaft hole, the cylinder spline hole, and the swash plate avoidance hole from front to back. The front end of the transmission shaft 203 is rotatably connected to the valve plate 101 through a bearing. A spline matching the cylinder spline hole is machined in the middle of the transmission shaft 203. A spline pair connection is adopted between the middle of the transmission shaft 203 and the plunger pump cylinder block 102. The rear end of the transmission shaft 203 is fixedly connected to the motor rotor 202. Other compositions and connection relationships are the same as those in Specific Embodiments One, Two, Three, Four, Five, Six, Seven, or Eight.

[0040] Specific Embodiment Ten: In combination with Figure 3Describing this embodiment, each slipper 104 of this embodiment includes a slipper body and a plunger ball head. A ball socket is provided at the front end of the slipper body, and the plunger ball head is fitted into the ball socket of the slipper body. The plunger ball head is connected to the corresponding piston 103. Other compositions and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth specific embodiments.

[0041] Working principle

[0042] Combined Figures 1 to 7 Describing the working principle of the oil-immersed motor-pump integrated hydraulic power unit of the present invention: Driven by the transmission shaft 203, the plunger pump cylinder block 102 rotates circularly inside the hydraulic pump valve block 301. The piston 103 and the slipper 104 rotate together with the plunger pump cylinder block 102. Since the slipper 104 is engaged with the swash plate 105, the connected piston 103 performs both radial rotation and axial movement.

[0043] When the piston 103 performs axial movement, it can complete the suction and discharge of hydraulic oil through the port plate 101, and its cycle is consistent with the rotation cycle of the transmission shaft 203.

[0044] The high-pressure end outlet assembly 302 and the oil return check valve 303 achieve the suction and discharge of hydraulic oil through the port plate 101. The overflow valve 304 is connected to the high-pressure end outlet assembly 302 and the oil return check valve 303, and when the outlet oil pressure is higher than the set value, it flows into the oil return circuit.

[0045] The power unit drive module 401 controls the motor drive module 402, receives information from the system sensing module 403, and receives and transmits information to the input / output module 404. The motor drive module 402 controls the operation of the motor assembly 2. The system sensing module 403 receives information such as the hydraulic oil pressure, temperature, and the rotation angle of the transmission shaft 203 of the power unit and transmits it to the power unit drive module 401. The input / output module 404 transmits the operation information of the power unit and receives information from the controller, and provides power for the motor assembly 2.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An oil-immersed motor pump integrated hydraulic power unit, characterized in that: The invention comprises a swash plate type piston pump assembly (1), a motor assembly (2) and a pump body assembly (3), wherein the pump body assembly (3) comprises a hydraulic pump valve block (301), a high pressure end outlet assembly (302) and an oil return check valve (303), the front of the hydraulic pump valve block (301) is provided with the high pressure end outlet assembly (302) and the oil return check valve (303), the rear of the hydraulic pump valve block (301) is provided with a valve block assembly hole, and the swash plate type piston pump assembly (1) comprises a The invention comprises a valve plate (101), a plunger pump cylinder body (102), a swash plate (105), a plurality of pistons (103) and a plurality of sliding shoes (104); the valve plate (101), the plunger pump cylinder body (102) and the swash plate (105) are sequentially inserted into the valve block assembly hole of the hydraulic pump valve block (301) from front to back; a plurality of plunger cavities arranged axially are evenly provided on the rear side of the plunger pump cylinder body (102) along the circumferential direction; a plurality of pistons (103) are arranged at the front and rear sides of the plurality of pistons (103). The ends are respectively inserted into the plurality of plunger cavities, the rear ends of the plurality of pistons (103) are respectively connected to the front ends of the swash plate (105) through the plurality of sliding shoes (104), the rear end of the swash plate (105) is connected to the front end of the motor assembly (2), the front end surface of the plunger pump cylinder body (102) is processed with a plurality of flow guide holes corresponding to the plurality of plunger cavities, the distribution plate (101) is provided with a distribution cavity corresponding to the flow guide holes, one end of the distribution cavity is connected to the plunger cavity through the flow guide hole, and the other end of the distribution cavity is connected to the high-pressure end outlet assembly (302) and the oil return check valve (303), the motor assembly (2) comprises a transmission shaft (203), the transmission shaft (203) passes through the distribution plate (101), the plunger pump cylinder body (102) and the swash plate (105) in sequence from front to back, the front end of the transmission shaft (203) is rotatably connected to the distribution plate (101), and the middle part of the transmission shaft (203) is fixedly connected to the plunger pump cylinder body (102); The swash plate type plunger pump assembly (1) further comprises a first sealing ring (106); a radially arranged first annular groove is machined on the outer side surface of the front end of the valve plate (101) along the circumferential direction; the first sealing ring (106) is installed in the first annular groove; the valve plate (101) is sealed and matched with the hydraulic pump valve block (301) via the first sealing ring (106); The motor assembly (2) further comprises a motor stator (201), a motor rotor (202) and a motor valve block (204); the rear end of the transmission shaft (203) is rotatably mounted on the motor valve block (204); the motor stator (201) is fixedly mounted on the motor valve block (204); the motor rotor (202) is sleeved outside the motor stator (201); a rotor end plate having a through hole in the center is provided at the front end of the motor rotor (202); a circular flange is provided at the rear middle of the transmission shaft (203); and the circular flange is fixedly connected to the rotor end plate of the motor rotor (202) via a plurality of connecting elements; The motor assembly (2) further comprises a second sealing ring (205); a second annular groove arranged radially is machined on the rear end outer side surface of the motor valve block (204) along the circumferential direction; the second sealing ring (205) is installed in the second annular groove; the motor valve block (204) is sealed and matched with the hydraulic pump valve block (301) via the second sealing ring (205); The valve plate (101) and the motor valve block (204) respectively seal the hydraulic oil with the hydraulic pump valve block (301) through the first sealing ring (106) and the second sealing ring (205). By sealing the two ends, the internal parts are immersed in the hydraulic oil and there is no dynamic seal in the system. Each sliding shoe (104) comprises a sliding shoe body and a plunger ball head, a ball socket is provided at the front end of the sliding shoe body, the plunger ball head is embedded in the ball socket of the sliding shoe body, and the plunger ball head is connected to a corresponding piston (103); The transmission shaft (203) is driven by the motor rotor (202) to rotate together. Driven by the transmission shaft (203), the plunger pump cylinder (102) performs a circular rotation inside the hydraulic pump valve block (301). The piston (103) and the slipper (104) rotate together with the plunger pump cylinder (102). Since the slipper (104) and the swash plate (105) are matched, the piston (103) connected to the slipper (104) performs both radial rotation and axial movement.

2. The oil-immersed motor-pump integrated hydraulic power unit according to claim 1, characterized in that: The pump body assembly (3) further comprises a relief valve (304), a fan (305), a power unit drive module housing (306), a motor drive module housing (307) and a rear housing (308). The relief valve (304) and the fan (305) are respectively mounted on the left and right sides of the hydraulic pump valve block (301). The relief valve (304) is connected to the high-pressure end outlet assembly (302) and the oil return check valve (303). The fan (305) is arranged opposite to the motor assembly (2). A power unit drive module installation slot and a motor drive module installation slot are respectively arranged above and below the hydraulic pump valve block (301). The power unit drive module housing (306) and the motor drive module housing (307) are respectively mounted on the upper and lower sides of the hydraulic pump valve block (301). The rear housing (308) is mounted on the rear of the hydraulic pump valve block (301).

3. The oil-immersed motor-pump integrated hydraulic power unit according to claim 2, characterized in that: The invention also comprises a drive control module (4), wherein the drive control module (4) comprises a power unit drive module (401), a motor drive module (402), a system sensing module (403) and an input-output module (404), wherein the power unit drive module (401) is installed in a power unit drive module installation slot above the hydraulic pump valve block (301), the motor drive module (402) is installed in a motor drive module installation slot below the hydraulic pump valve block (301), and the system sensing module (403) and the input-output module (404) are both installed on the hydraulic pump valve block (301).

4. The oil-immersed motor-pump integrated hydraulic power unit according to claim 3, characterized in that: The system sensing module (403) comprises a pressure sensor, a temperature sensor, a magnetic angle sensor, a magnet and a magnet fixing seat. Two groups of first sensor mounting holes are provided on the hydraulic pump valve block (301). The pressure sensor and the temperature sensor are respectively inserted into the two groups of first sensor mounting holes. The measuring ends of the pressure sensor and the temperature sensor are in contact with the hydraulic oil in the high-pressure end outlet component (302) and the return oil check valve (303). A horizontally arranged second sensor mounting hole is provided on the side of the hydraulic pump valve block (301). The magnetic angle sensor is inserted into the second sensor mounting hole. The measuring end of the magnetic angle sensor is arranged opposite to the transmission shaft (203). A magnet mounting hole is provided at the rear end center of the transmission shaft (203). The magnet is installed in the magnet mounting hole. The magnet fixing seat is buckled on the magnet. The magnet fixing seat is fixedly connected to the rear end surface of the motor valve block (204) via a connecting element.

5. The oil-immersed motor-pump integrated hydraulic power unit according to claim 4, characterized in that: The input-output module (404) includes a power connector and two aviation plugs. Two groups of plug installation holes are provided on the hydraulic pump valve block (301). The two aviation plugs are respectively inserted into the two groups of plug installation holes. The aviation plugs and the relief valve (304) are located on the same side. The power connector is installed on the hydraulic pump valve block (301).

Images