CN101635484A - Integrated hydraulically-driven permanent magnet synchronous generator - Google Patents

Abstract

The invention discloses an integrated hydraulically driven permanent magnet synchronous generator, which comprises a motor casing (25), a rotating shaft (24), a cylinder body (23), a permanent magnet (26) and a motor stator (27), The right side of the cylinder body (23) is close to the oil distribution plate (20), and a swash plate (31) is arranged on the left side of the cylinder body (23); a plunger hole (32) is arranged in the cylinder body (23), located at The plunger (8) in the plunger hole (32) is connected to the sliding shoe (6) in rotation, and the sliding shoe (6) is close to the swash plate (31); the oil inlet (15a) on the oil joint block (16) , the oil inlet channel in the right end cover (17) and the oil inlet window on the oil distribution plate (20) are connected in turn, the oil outlet (15b) on the oil connection block (16), the oil outlet (15b) in the right end cover (17) The oil outlet channel and the oil outlet window on the oil distribution plate (20) are connected successively. The permanent magnet synchronous generator of the present invention is used to convert hydraulic energy into electrical energy.

Description

An Integrated Hydraulically Driven Permanent Magnet Synchronous Generator

technical field

The invention relates to hydraulic technology and a permanent magnet synchronous generator, in particular to an integrated conversion device from hydraulic energy to electric energy.

Background technique

Using a hydraulic motor to drive a generator to realize the conversion of hydraulic energy to electrical energy can be used in many occasions, such as potential energy recovery of hybrid construction machinery, field power supply, wind power generation, etc. Taking potential energy recovery of hybrid construction machinery as an example, hydraulic motors and generators are installed in the oil return circuit of the system. When the boom is lowered, the return oil back pressure formed by potential energy drives the generator to rotate through the hydraulic motor, and then uses capacitors or batteries to The energy storage device stores the electrical energy generated by the generator, thereby converting the hydraulic energy into electrical energy. At present, the power generation device is generally composed of a separate hydraulic motor, a coupling and a coaxial connection of the generator, but the weight and space occupied by this installation combination are large, and it is not suitable for mobile equipment such as construction machinery. Moreover, the hydraulic motor and the generator are mechanically driven through the coupling, which reduces the overall mechanical efficiency of the device. In order to control the flow, the displacement of the hydraulic motor or the speed of the generator can be adjusted, but the control performance of the displacement control or the open-loop speed control is not very ideal. In addition, since the hydraulic motor has an overhanging shaft, there may be external leakage.

Contents of the invention

The technical problem to be solved by the present invention is to provide an integrated hydraulically driven permanent magnet synchronous generator, which can reduce the weight and volume of the entire hydraulic power generation device, improve mechanical efficiency, and at the same time ensure better control performance.

In order to solve the above technical problems, the present invention provides an integrated hydraulically driven permanent magnet synchronous generator, which includes a motor housing, and a left end cover and a right end cover are respectively fixed on both sides of the motor housing, passing through the motor housing The rotating shaft of the rotating shaft is connected with the motor housing; there is a hollow cylindrical cylinder in the motor housing, the cylinder is set on the outer surface of the rotating shaft, and the right side of the cylinder is close to the oil distribution plate. A swash plate is set on the left side; there are 7 or 9 plunger holes penetrating the cylinder body in the cylinder body, and each plunger hole is provided with a plunger that is slidably connected to the inner surface of the plunger hole; The head of the plug is connected to the sliding shoe in rotation, and the sliding shoe is close to the slope of the swash plate and slides along the slope of the swash plate; a permanent magnet is set on the outer ring of the cylinder, and the motor stator with stator winding is set outside the permanent magnet ;The oil joint block is fixedly connected with the right end cover, and the oil joint block is respectively provided with an oil inlet and an oil outlet, and the right end cover is respectively provided with an oil inlet channel and an oil outlet channel, and the oil distribution plate is respectively provided with an oil inlet port and an oil outlet port. The window and the oil outlet window, the oil inlet on the oil connection block, the oil inlet channel in the right end cover and the oil inlet window on the oil distribution plate are connected in sequence, the oil outlet on the oil connection block, the oil inlet in the right end cover The oil outlet channel communicates with the oil outlet window on the oil distribution plate in sequence.

As an improvement of the integrated hydraulically driven permanent magnet synchronous generator of the present invention: a rotational speed sensor is provided on the rotating shaft.

As a further improvement of the integrated hydraulically driven permanent magnet synchronous generator of the present invention: a left bearing is provided in the left end cover, a right bearing is provided in the right end cover, and the left and right ends of the rotating shaft are respectively connected with the left bearing and the right bearing .

As a further improvement of the integrated hydraulically driven permanent magnet synchronous generator of the present invention: the head of the plunger is hinged with the slide shoe, the outer surface of the slide shoe is connected with the return disk, and the spherical hinge is connected with the spherical surface of the return disk; A push rod and a return spring are arranged in the gap between the inner rings of the cylinder, and the two ends of the push rod are respectively against the return spring and the spherical hinge, so that the sliding shoe is close to the slope of the swash plate.

As a further improvement of the integrated hydraulically driven permanent magnet synchronous generator of the present invention: a junction box is provided on the motor casing, and the wires of the speed sensor and the stator winding are respectively introduced into the junction box.

As a further improvement of the integrated hydraulically driven permanent magnet synchronous generator of the present invention: an oil drain port is also provided on the motor casing.

The integrated hydraulically driven permanent magnet synchronous generator of the present invention organically integrates discrete hydraulic motors and generators, omits couplings, embeds permanent magnets on the motor cylinder to form a rotor, and utilizes hydraulic drive and motor rotor One-piece cylinder, which directly converts hydraulic energy into electrical energy.

Compared with the background technology, the present invention has beneficial effects as follows:

The integrated hydraulically driven permanent magnet synchronous generator organically integrates the discrete axial piston motor and the permanent magnet synchronous generator, eliminating the need for a coupling, which not only makes the hydraulic power generation device compact in structure, but also greatly reduces its weight and occupied space. It is small, and can save raw materials and reduce the overall cost. The invention is used to directly convert hydraulic energy into electric energy. The invention removes the intermediate transmission link and a pair of bearings at the same time, so it has higher mechanical efficiency. And because the moment of inertia is greatly reduced after the hydraulic motor and generator are integrated, and a speed sensor is installed, better control performance can be achieved. The invention has no overhang shaft, reliable sealing and avoids external leakage.

Description of drawings

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is the sectional structure schematic diagram of the integrated hydraulically driven permanent magnet synchronous generator of the present invention;

Fig. 2 is a sectional view of A-A in Fig. 1 .

In the figure: 1. Left end cover, 2. Left bearing, 3. Speed sensor, 4. Pin, 5. Junction box, 6. Sliding shoe, 7. Return plate, 8. Plunger, 9. Ejector rod, 10. Spring Seat, 11, gasket, 12, retaining ring, 13, pin, 14, oil drain port, 15a, oil inlet port, 15b, oil outlet port, 16, oil connection block, 17, right end cover, 18, sealing ring , 19, right bearing, 20, oil distribution plate, 21, return spring, 22, base, 23, cylinder block, 24, rotating shaft, 25, motor housing, 26, permanent magnet, 27, motor stator, 28, Stator winding, 29, ball hinge, 30, screw, 31, swash plate, 32, plunger hole, 33, screw, 34, sealing ring, 35, slope, 36, head, 37, hydraulic oil channel, 38, channel .

Detailed ways

Figures 1 to 2 combinedly provide an integrated hydraulically driven permanent magnet synchronous generator, including a base 22 and a motor housing 25 arranged on the base 22, which are respectively fixed on both sides of the motor housing 25 A left end cover 1 and a right end cover 17 are provided; a cylinder body 23 , a rotating shaft 24 , a swash plate 31 , an oil distribution plate 20 and the like are respectively provided on the motor housing 25 . A junction box 5 is provided on the motor housing 25 , and an oil drain port 14 is also provided on the motor housing 25 .

The left end cover 1 is fixedly connected with the motor housing 25 through screws 30, and a sealing ring 34 is arranged between the left end cover 1 and the motor housing 25; the right end cover 17 is fixedly connected with the motor housing 25 through screws 33, and the right end cover A sealing ring 18 is arranged between 17 and the motor housing 25 . An oil inlet passage and an oil outlet passage are respectively arranged in the right end cover 17 . A left bearing 2 is provided in the left end cover 1, and a right bearing 19 is provided in the right end cover 17. The left end of the rotating shaft 24 that runs through the motor housing 25 is connected with the left bearing 2 through a shaft sleeve, and the right end is connected with the right bearing through a shaft sleeve. 19; the axis of the rotating shaft 24 overlaps with the axis of the motor housing 25.

A hollow cylindrical cylinder 23 is arranged inside the motor housing 25, and the cylinder 23 is sleeved on the outer surface of the rotating shaft 24, and the cylinder 23 and the rotating shaft 24 are fixedly connected by splines; the inner ring of the cylinder 23 (that is, the inner surface) and the outer surface of the rotating shaft 24 maintain a certain gap. A swash plate 31 is set on the left side of the cylinder body 23, and the swash plate 31 is fixedly connected to the left end cover 1 through the pin 4; an oil distribution plate 20 is set on the right side of the cylinder body 23, and the oil distribution plate 20 is connected to the right end cover through the pin 13 17 is fixedly connected, and the oil distribution plate 20 is close to the right end surface of the cylinder body 23. An oil inlet window and an oil return window are respectively arranged on the oil distribution plate 20 .

Nine plunger holes 32 axially penetrating through the cylinder body 23 are evenly arranged in the cylinder body 23, and a plunger 8 that can slide left and right along the inner surface of the plunger hole 32 is arranged in each plunger hole 32, The inner surface of the plunger 8 and the plunger hole 32 is sealed by hydraulic oil in the mating surface. The spherical head 36 of each plunger 8 is hinged with the spherical recess on the corresponding sliding shoe 6, and 9 round holes are uniformly distributed on the return disk 7, so the upper end of each sliding shoe 6 is sleeved on the circle of the return disk 7. In the hole, the sliding shoe 6 is fixedly connected with the return plate 7. The spherical hinge 29 is hinged with the return disc 7 in the form of spherical fit. Therefore, one side of the cylinder body 23 is tightly attached to the oil distribution plate 20, and the other side is attached to the swash plate 31 through the cooperation of the plunger 8, the sliding shoe 6, the ball joint 29 and the return plate 7.

A hydraulic oil passage 37 is provided in the plunger 8, and the hydraulic oil passage 37 forms a damping hole at the head 36 of the plunger 8; The gap between the inclined planes 35 forms a damping, and the damping hole and the damping form a B-type hydraulic half bridge, which forms the feedback control function of the bottom cavity pressure of the sliding shoe 6 . After the oil in the plunger hole 32 flows through the hydraulic oil passage 37, it lubricates and seals the mating surface between the head 36 of the plunger 8 and the sliding shoe 6; The mating surface of 31 inclined planes 35 is lubricated and sealed.

In the gap formed by the inner ring of the cylinder body 23 and the outer surface of the rotating shaft 24, a spring seat 10, a retaining ring 12, a return spring 21 and several push rods 9 (6 shown in FIG. 2 for example) are arranged. The retaining ring 12 near the right end surface of the cylinder body 23 is fixedly connected with the cylinder body 23, the right end of the return spring 21 is against the retaining ring 12 through the washer 11, the left end of the return spring 21 is provided with a spring seat 10, and the two ends of each push rod 9 are respectively Against the spring seat 10 and the ball joint 29. The return spring 21 is fixed in a compressed state by the spring seat 10 and the retaining ring 12, so that on the one hand, the cylinder body 23 presses the valve plate 20, and on the other hand, the sliding shoe 6 is tightened by the push rod 9, the ball joint 29 and the return plate 7 in sequence. Paste the slope 35 of the swash plate 31.

An annular permanent magnet 26 is set on the outer ring of the cylinder block 23, and the annular motor stator 27 is coaxially surrounded on the outside of the cylinder block 23, that is, the motor stator 27 is coaxially surrounded by the permanent magnet 26. The inner surface of the motor housing 25 is fixedly connected; the stator winding 28 is embedded in the motor stator 27 .

In the inner cavity of the left end cover 1, a speed sensor 3 is arranged, and the speed sensor 3 is fixedly set on the outer surface of the rotating shaft 24, that is, the speed sensor 3 rotates together with the rotating shaft 24; the wires of the speed sensor 3 and the stator winding 28 are respectively Introduced into the junction box 5.

The oil connection block 16 is fixedly connected with the right end cover 17, and the oil connection block 16 is provided with an oil inlet 15a and an oil outlet 15b. The oil inlet 15a on the oil joint block 16, the oil inlet channel in the right end cover 17 and the oil inlet window on the oil distribution plate 20 are connected in sequence, and the oil outlet 15b on the oil joint block 16, the oil outlet 15b in the right end cover 17 The oil outlet channel of the oil outlet and the oil outlet window on the oil distribution plate 20 are connected successively. During the rotation of the cylinder body 23, among the 9 plunger holes 32, 4 or 5 plunger holes 32 communicate with the oil inlet windows on the oil distribution plate 20, and the rest of the plunger holes 32 communicate with the oil inlet windows on the oil distribution plate 20. The oil outlet windows are connected. The plunger hole 32 connected with the oil inlet window on the oil distribution plate 20 is called the high pressure chamber plunger hole, and the plunger hole 32 connected with the oil outlet window on the oil distribution plate 20 is called the low pressure chamber plunger hole.

In the integrated hydraulically driven permanent magnet synchronous generator of the present invention, the permanent magnet 26 arranged on the cylinder body 23 rotates together with the rotating shaft 24, thereby constituting the rotor of the generator.

The working principle of the integrated hydraulically driven permanent magnet synchronous generator of the present invention is as follows:

On the one hand, when the oil inlet 15a on the oil joint block 16 is connected with high-pressure oil, the oil enters the oil distribution plate 20 through the oil inlet 15a of the oil joint block 16 and the oil inlet channel of the right end cover 17 in sequence. The oil inlet window then flows into the high-pressure chamber plunger hole of the cylinder body 23; due to the effect of high-pressure oil, the plunger 8 in the high-pressure chamber plunger hole is ejected (ie moves toward the inclined plane 35 of the swash plate 31). On the other hand, the plunger 8 in the plunger hole of the low-pressure chamber is retracted, and the low-pressure oil passes through the oil return window of the distribution plate 20, the oil outlet channel of the right end cover 17, and the oil outlet 15b of the oil connection block 16 to return Oil. The oil in each plunger hole 32 is periodically switched between the high-pressure chamber and the low-pressure chamber, thereby completing the process of periodic oil inlet and oil return.

Due to the action of the high and low pressure oil, the reaction force of the swash plate 31 to the cylinder body 23 forms an unbalanced driving moment, which drives the cylinder body 23 to rotate. During the rotation movement, the shoe 6 slides on the slant 35 of the swash plate 31 on an elliptical trajectory, and the plunger 8 makes a linear reciprocating motion in the plunger hole 32 relative to the cylinder 23. When the high-pressure oil is passed through the plunger hole 32 , the plunger 8 moves outward (is pushed out); when the plunger hole 32 passes through low-pressure oil, the plunger 8 moves inward (retracted). The cylinder 23 is embedded with a permanent magnet 26, which constitutes the rotor of the generator. After the rotor rotates, according to the principle of electromagnetic induction, an induced electromotive force will be generated in the stator winding 28 of the motor stator 27, and an induced current will be generated after being connected to the load through the junction box 5 , so as to realize the direct conversion of hydraulic energy to electrical energy. The rotation speed sensor 3 is used to detect the rotation speed of the rotor of the motor, so that the closed-loop control of the rotation speed can be realized, and the flow rate can be precisely controlled.

During operation, the friction pairs between the plunger 8 and the plunger hole 32, the sliding shoe 6 and the inclined surface 35 of the swash plate 31, and the cylinder block 23 and the distribution plate 20 inevitably have leakage. If the internal oil pressure is too high, the leaked oil needs to be discharged out of the motor casing 25 in time, and the oil drain port 14 is used to discharge the leaked oil.

Finally, it should also be noted that what is listed above is only a specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.

Claims (6)

1, a kind of magneto alternator of integrated hydraulic driving, comprise electric machine casing (25), it is characterized in that: fixedly install left end cap (1) and right end cap (17) respectively in the both sides of electric machine casing (25), the rotating shaft (24) that runs through electric machine casing (25) is rotatedly connected with electric machine casing (25); Be provided with the cylinder body (23) of open circles column type in electric machine casing (25), described cylinder body (23) is sleeved on the outer surface of rotating shaft (24), and oil distribution casing (20) is close on the right side of cylinder body (23), in the left side of cylinder body (23) swash plate (31) is set; In cylinder body (23), be provided with 7 or 9 plunger holes (32) that run through cylinder body (23), be equipped with the plunger (8) that links to each other with the slip of the inner surface of plunger hole (32) sealing in each plunger hole (32); The head (36) of plunger (8) and piston shoes (6) are rotatedly connected, and piston shoes (6) are close to the inclined-plane (35) of swash plate (31) and are slided along the inclined-plane (35) of swash plate (3); In the outer ring of cylinder body (23) permanent magnet (26) is set, the motor stator (27) that has stator winding (28) is sleeved on the outside of permanent magnet (26); Logical oily joint piece (16) is fixedly linked with right end cap (17), be respectively equipped with oil-in (15a) and oil-out (15b) on the logical oily joint piece (16), right end cap is respectively equipped with oil inlet passage and oil discharge passage in (17), be respectively equipped with oil-feed window and fuel-displaced window on the oil distribution casing (20), oil-in (15a) on the logical oily joint piece (16), oil inlet passage in the right end cap (17) and the oil-feed window on the oil distribution casing (20) are connected successively, the oil-out (15b) on the logical oily joint piece (16), oil discharge passage in the right end cap (17) and the fuel-displaced window on the oil distribution casing (20) are connected successively.

2, the magneto alternator of a kind of integrated hydraulic driving according to claim 1 is characterized in that: be provided with speed probe (3) on rotating shaft (24).

3, the magneto alternator of a kind of integrated hydraulic driving according to claim 1 and 2, it is characterized in that: in left end cap (1), be provided with left bearing (2), be provided with right bearing (19) in right end cap (17), the two ends, the left and right sides of rotating shaft (24) link to each other with right bearing (19) with left bearing (2) respectively.

4, the magneto alternator of a kind of integrated hydraulic driving according to claim 3, it is characterized in that: the head (36) of plunger (8) is hinged with piston shoes (6), the outer surface of piston shoes (6) links to each other with backhaul dish (7), and ball pivot (29) is hinged with backhaul dish (7) sphere; In the gap between rotating shaft (24) and cylinder body (23) inner ring push rod (9) and retracting spring (21) are set, the two ends of push rod (9) are being supported retracting spring (21) and ball pivot (29) respectively, thereby make piston shoes (6) be close to the inclined-plane (35) of swash plate (31).

5, the magneto alternator of a kind of integrated hydraulic driving according to claim 4, it is characterized in that: electric machine casing (25) is provided with terminal box (5), and the lead of speed probe (3) and stator winding (28) is introduced into respectively in the terminal box (5).

6, the magneto alternator of a kind of integrated hydraulic driving according to claim 5 is characterized in that: also be provided with drain tap (14) on the electric machine casing (25).

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