A scraper type permanent magnet synchronous motor electro-hydraulic coupler

Abstract

The present invention discloses a scraper-type permanent magnet synchronous electro-hydraulic coupler, wherein the end cap is sealed and fixed to the open end of the pump chamber, a cam rotor is installed in the pump chamber, a front shaft seal passes through the front shaft hole and is rotatably connected to it, and then extends out of the pump body, and the rear shaft is rotatably connected to the rear shaft fixing groove. Upper and lower scrapers are respectively placed in the pump chamber on the upper and lower sides of the rotor shaft, and together with the rotor shaft, the pump chamber is divided into a low-pressure chamber on the left and a high-pressure chamber on the right. The front ends of the upper and lower scrapers are respectively fixed to the inner wall of the pump chamber by upper and lower torsion springs. A winding is embedded in the inner surface of the end cap or the inner wall of the bottom of the pump chamber. Correspondingly, a pair of permanent magnets are embedded in the surface of the rotor shaft near the winding. As the rotor shaft rotates, the upper and lower scrapers swing, and their free ends always press against the outer circumference of the rotor shaft, scraping the fluid on the rotor shaft surface. The structure is compact, efficient, and can achieve the mutual conversion between electrical energy, mechanical energy, and hydraulic energy, with good promotion and application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of power conversion devices, and in particular relates to a scraper-type permanent magnet synchronous motor electro-hydraulic coupler. Background Art

[0002] In the fields of automobiles, engineering machinery, etc., devices for converting multiple energies such as electrical energy, hydraulic energy or mechanical energy are often needed. For example, swash plate hydraulic pumps or hydraulic motors, electromechanical couplings, fluid couplings, electric motor-hydraulic pump combinations and other power devices are used. However, traditional power devices can only achieve the conversion of two energies. For example, electromechanical couplings can realize the mutual conversion of mechanical energy and electrical energy, and fluid couplings can realize the mutual conversion of hydraulic energy and mechanical energy. They cannot realize the conversion of multiple energies. To this end, the patent with application number CN201710962342.5 discloses an AC synchronous quantitative electro-hydraulic coupler, including a shell, inside which a mechanical energy component, a swash plate hydraulic energy component, and an electric energy component are arranged; the mechanical energy component includes a transmission shaft, the front end of the transmission shaft extends out of the shell; the swash plate hydraulic energy component includes a swash plate, a cylinder body, and a distribution plate; the cylinder body is connected to the transmission shaft by a key; the cylinder body includes a plunger hole, a plunger, and a sliding shoe, the bottom surface of the sliding shoe is tightly attached to the wedge surface of the swash plate and slides; the rear of the cylinder body is tightly attached to the distribution plate; the electric energy component includes a stator core and a rotor; a stator winding; there are three stator cores, which are fixed in the shell; the stator core is wound with a series of stator windings, and lead terminals U1, U2, and U3 are connected between the stator windings. The rotor is a permanent magnet fixed outside the cylinder body, and the polarity of the rotor is reversed and opposite, so that mechanical energy, hydraulic energy, and electric energy can be converted into each other in pairs. Patent application number CN201710960211.3 discloses a DC stator-excited electro-hydraulic coupler, comprising a support system, a mechanical energy conversion system, a hydraulic energy conversion system, and an electrical energy conversion system. The support system includes a housing and a valve plate; the hydraulic energy conversion system includes a cylinder, a swash plate, and a plunger; and the electrical energy conversion system includes a rotor coil, a stator core, an excitation winding, and lead terminals. The stator core and its excitation winding are fixed within the housing. The drive shaft and the cylinder rotate synchronously via a spline connection. Under the action of the swash plate, the plunger reciprocates along the axis to draw in or out hydraulic oil. During operation, the lead terminals are connected to an external DC power source to achieve mutual conversion between mechanical energy, hydraulic energy, and electrical energy. Although the aforementioned couplers can achieve two-to-two conversion between mechanical energy, hydraulic energy, and electrical energy, the use of a piston to propel the fluid within the cavity results in a dispersed, uncompact, large, and complex structure. Therefore, the present invention provides a scraper-type permanent magnet synchronous electro-hydraulic coupler with a simple structure and a small size. Summary of the Invention

[0003] The purpose of the present invention is to provide a scraper-type permanent magnet synchronous electro-hydraulic coupler, which solves the problem that the existing electro-hydraulic coupler is large in size and complex in structure.

[0004] To achieve the above-mentioned purpose, the present invention relates to a scraper-type permanent magnet synchronous electro-hydraulic coupler, whose main structure includes a rotor shaft, a scraper, a pump body, a permanent magnet pair, a torsion spring, an end cover, a winding, a high-pressure fluid input / output port and a low-pressure fluid input / output port, wherein the scraper is divided into an upper scraper and a lower scraper, the permanent magnet pair includes an N-pole permanent magnet and an S-pole permanent magnet, and the torsion spring is divided into an upper torsion spring and a lower torsion spring; a pump chamber is provided in the pump body, one end of the pump chamber is open, and the end cover is sealed and fixed to the open end of the pump chamber; the rotor shaft is a stepped shaft, including a front rotating shaft, a cam rotor and a rear rotating shaft connected in sequence; the cam rotor is a blade-type structure, a front rotating shaft hole is provided in the center of the bottom of the pump chamber, and a rear rotating shaft fixing groove is provided on the inner surface of the end cover; the cam rotor is installed in the pump chamber and has a certain rotational gap between it and the pump chamber; the front rotating shaft seal passes through the front rotating shaft hole and is rotatably connected to it, and then extends out of the pump body; the rear rotating shaft is rotatably connected to the rear rotating shaft fixing groove, The upper scraper and the lower scraper are respectively placed in the pump chambers on the upper and lower sides of the rotor shaft, and together with the rotor shaft, the pump chamber is divided into a low-pressure chamber on the left and a high-pressure chamber on the right. The low-pressure chamber and the high-pressure chamber are respectively connected to the low-pressure fluid input / output port and the high-pressure fluid input / output port. The volume of the low-pressure chamber is larger than that of the high-pressure chamber. The front ends of the upper scraper and the lower scraper are respectively fixed to the inner wall of the pump chamber by upper torsion springs and lower torsion springs. The upper torsion springs and the lower torsion springs respectively apply an elastic force pointing to the axis of the rotor shaft to the upper scraper and the lower scraper, and a winding is embedded in the inner surface of the end cover or the inner wall of the bottom of the pump chamber. Correspondingly, a permanent magnet pair is embedded in the surface of the rotor shaft close to the winding. The winding and the permanent magnet pair correspond one to one, and the winding is just placed on the outer periphery of the corresponding permanent magnet pair. When the rotor shaft rotates, the upper scraper and the lower scraper swing and their free ends always press against the outer periphery of the rotor shaft, scraping the fluid on the surface of the rotor shaft 1, thereby realizing the conversion of the fluid between the high-pressure chamber and the low-pressure chamber.

[0005] The pump chamber involved in the present invention includes a cylindrical rotor chamber, an upper scraper mounting groove, a lower scraper mounting groove, a high-pressure fluid chamber and a low-pressure fluid chamber. The rotor chamber is opened on the pump body, and the upper scraper mounting groove and the lower scraper mounting groove are respectively opened on the inner wall of the pump chamber on the upper and lower sides of the rotor chamber. The depth of the upper scraper mounting groove and the lower scraper mounting groove is greater than the depth of the rotor chamber. The high-pressure fluid chamber and the low-pressure fluid chamber are respectively opened on the pump body on the left and right sides of the rotor chamber. The rotor chamber and the high-pressure fluid chamber are connected at the upper scraper mounting groove, the upper part of the low-pressure fluid chamber is connected to the rotor chamber, and the lower part of the low-pressure fluid chamber is connected to the lower scraper mounting groove. The plate mounting groove is connected with the rotor cavity, and a low-pressure fluid input / output port and a high-pressure fluid input / output port are respectively opened on the side wall of the pump body. The low-pressure fluid input / output port and the high-pressure fluid input / output port are respectively connected with the low-pressure fluid cavity and the high-pressure fluid cavity. The upper scraper and the lower scraper are respectively placed in the upper scraper mounting groove and the lower scraper mounting groove and are matched with a small gap. The front ends of the upper scraper and the lower scraper are respectively fixed in the upper scraper mounting groove and the lower scraper mounting groove by an upper torsion spring and a lower torsion spring. The cam rotor is placed in the rotor cavity, and there is a small gap between the cam rotor and the rotor cavity.

[0006] The scraper-type permanent magnet synchronous motor electro-hydraulic coupler involved in the present invention also includes a front bearing and a rear bearing. The front bearing is placed in the front shaft hole and the two are interference fit. The front shaft is installed in the front bearing and there is a clearance fit between the two. The front shaft rotates around the front bearing. The rear bearing is placed in the rear shaft fixing groove and the two are interference fit. The rear shaft is installed in the rear bearing and there is a clearance fit between the two. The rear shaft rotates around the rear bearing.

[0007] An FB-shaped sealing retaining ring and a spring retaining ring are fixed in sequence in the front rotating shaft hole at the front end of the front bearing shell, and the front rotating shaft passes through the front bearing shell, the FB-shaped sealing retaining ring and the spring retaining ring in sequence.

[0008] The upper scraper and lower scraper involved in the present invention have the same structure, both including a cylindrical embedded portion and a scraper portion, one side of the scraper portion is fixed on the embedded portion, and the arc surface on the other side of the scraper portion is pressed against the outer peripheral surface of the cam rotor, the embedded portion is installed in the upper scraper mounting groove or the lower scraper mounting groove, and an annular groove is provided on the outside of the end of the embedded portion away from the end cover, the upper torsion spring or the lower torsion spring is sleeved in the annular groove, one end of the upper torsion spring or the lower torsion spring is fixed to the embedded portion, and the other end is fixed to the inner wall of the upper scraper mounting groove or the lower scraper mounting groove.

[0009] A number of annular grooves are provided on the inner surface of the end cover or the inner wall of the bottom of the rotor cavity. The wires are wound in the annular grooves to form windings. When the windings are energized, an annular magnetic field is formed in the pump cavity. A number of slots are provided on the surface of the rotor shaft on one side close to the windings. The annular grooves correspond to the slots one by one, and the annular grooves are placed on the outer periphery of the corresponding slots. The N-pole permanent magnets and the S-pole permanent magnets are embedded in the slots. The N-pole permanent magnets and the S-pole permanent magnets in the annularly arranged slots are arranged in the order of N, S, N, S..., to ensure that the magnetic pole sequence can be driven to rotate by the annular magnetic field, thereby driving the rotor shaft to rotate.

[0010] The scraper-type permanent magnet synchronous electro-hydraulic coupler of the present invention also includes a first sealing ring, which is placed exactly at the gap between the cam rotor and the end cover between the permanent magnet pair and the winding.

[0011] The second sealing ring is fixed at the connection between the end cover and the open end of the pump chamber, and the end cover is fixed to the open end of the pump body by nuts and bolts.

[0012] The outer peripheral shape of the cam rotor in this embodiment is a cam profile, which can be a smooth ellipse, semi-ellipse, circle, cycloid, or a combination of profiles.

[0013] Preferably, the cam rotor is a five-blade rotor evenly distributed along the circumference, with blade peaks being circular arcs and blade valleys being cycloids.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The cam rotor cooperates with the upper and lower scrapers to improve the overall stability; (2) A permanent magnet is embedded in the cam rotor, and a wire is wound on one side of the end cover to form a stator winding structure, thereby realizing the conversion between electric energy, hydraulic energy and mechanical energy, and meeting the urgent needs of power equipment for effective conversion of electric energy and other forms of energy in industries such as transportation and engineering construction; (3) The cam rotor and the upper and lower scrapers serve as boundaries to divide the pump body into a low-pressure chamber on the left and a high-pressure chamber on the right. The upper scraper and the lower scraper swing to scrape the fluid on the surface of the rotor shaft, thereby realizing the conversion between hydraulic energy and the other two energies; (4) The rotor shaft extends out of the pump body for easy connection with other external energy equipment; (5) The device has a compact structure, a small size, a high energy conversion rate, and can realize the mutual conversion between multiple power sources, with wider practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the scraper-type permanent magnet synchronous machine electro-hydraulic coupler involved in Example 1.

[0016] Figure 2 This is a main sectional view of the scraper-type permanent magnet synchronous machine electro-hydraulic coupling involved in Example 1.

[0017] Figure 3 for Figure 2 Cross-sectional view of section AA.

[0018] Figure 4 This is a cross-sectional view of the pump body involved in Example 1.

[0019] Figure 5 This is a side view of the pump body involved in Example 1.

[0020] Figure 6 This is a side view of the end cover involved in Example 1.

[0021] Figure 7 This is a diagram showing the connection between the scraper and the torsion spring according to Example 1.

[0022] Among them: 1 is the rotor shaft, 2 is the scraper, 3 is the pump body, 4 is the permanent magnet pair, 5 is the torsion spring, 6 is the end cover, 7 is the winding, 8 is the high-pressure fluid input / output port, 9 is the low-pressure fluid input / output port, 10 is the first sealing ring, 11 is the front bearing, 12 is the rear bearing, 13 is the second sealing ring, 14 is the nut, 15 is the bolt, 16 is the FB-shaped sealing ring, 17 is the spring ring, 2A is the upper scraper, 2B It is the lower scraper, 401 is the N-pole permanent magnet, 402 is the S-pole permanent magnet, 5A is the upper torsion spring, 5B is the lower torsion spring, 101 is the front rotating shaft, 102 is the cam rotor, 103 is the rear rotating shaft, 201 is the embedded part, 202 is the scraper part, 203 is an annular groove, 301 is the rotor cavity, 302 is the upper scraper mounting groove, 303 is the lower scraper mounting groove, 304 is the high-pressure fluid cavity, and 305 is the low-pressure fluid cavity. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the content of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0024] Example 1

[0025] like Figure 1-4 As shown, the scraper-type permanent magnet synchronous motor electro-hydraulic coupler involved in this embodiment has a main structure including a rotor shaft 1, a scraper 2, a pump body 3, a permanent magnet pair 4, a torsion spring 5, an end cover 6, a winding 7, a high-pressure fluid input / output port 8, and a low-pressure fluid input / output port 9. The scraper 2 is divided into an upper scraper 2A and a lower scraper 2B, the permanent magnet pair 4 includes an N-pole permanent magnet 401 and an S-pole permanent magnet 402, and the torsion spring 5 is divided into an upper torsion spring 5A and a lower torsion spring 5B.

[0026] A pump chamber is provided in the pump body 3, one end of the pump chamber is open, and the end cover 6 is sealed and fixed to the open end of the pump chamber. The rotor shaft 1 is a stepped shaft, including a front shaft 101, a cam rotor 102 and a rear shaft 103 connected in sequence. The cam rotor 102 is a blade-type structure, a front shaft hole is provided in the center of the bottom of the pump chamber, and a rear shaft fixing groove is provided on the inner surface of the end cover 6. The cam rotor 1 is installed in the pump chamber and has a certain rotational gap between it and the pump chamber. The front shaft 101 is sealed and passes through the front shaft hole and is rotatably connected to it, and then extends out of the pump body 3. The rear shaft 103 is rotatably connected to the rear shaft fixing groove.

[0027] The upper scraper 2A and the lower scraper 2B are respectively placed in the pump chamber on the upper and lower sides of the rotor shaft 1, and together with the rotor shaft, the pump chamber is divided into a low-pressure chamber on the left and a high-pressure chamber on the right. The low-pressure chamber and the high-pressure chamber are respectively connected to the low-pressure fluid input / output port 9 and the high-pressure fluid input / output port 8. The volume of the low-pressure chamber is greater than that of the high-pressure chamber. The front ends of the upper scraper 2A and the lower scraper 2B are respectively fixed to the inner wall of the pump chamber by the upper torsion spring 5A and the lower torsion spring 5B. The upper torsion spring 5A and the lower torsion spring 5B respectively push the upper scraper 2A and the lower scraper 2B to move upward. The plate 2B exerts an elastic force directed toward the axis of the rotor shaft 1, and the winding 7 is embedded in the inner surface of the end cover 6. Correspondingly, the permanent magnet pair 4 is embedded in the surface of the rotor shaft 1 close to the winding 7. The winding 7 and the permanent magnet pair 4 correspond one to one, and the winding 7 is exactly placed on the outer periphery of the corresponding permanent magnet pair 4. When the rotor shaft 1 rotates, the upper scraper 2A and the lower scraper 2B swing, and their free ends always press against the outer periphery of the rotor shaft 102, scraping the fluid on the surface of the rotor shaft 1, thereby realizing the conversion of the fluid between the high-pressure chamber and the low-pressure chamber.

[0028] The pump chamber involved in this embodiment includes a cylindrical rotor chamber 301, an upper scraper mounting groove 302, a lower scraper mounting groove 303, a high-pressure fluid chamber 304 and a low-pressure fluid chamber 305. The rotor chamber 301 is opened on the pump body 3, and the upper scraper mounting groove 302 and the lower scraper mounting groove 303 are opened on the inner wall of the pump chamber on the upper and lower sides of the rotor chamber 301 respectively. The depth of the upper scraper mounting groove 302 and the lower scraper mounting groove 303 is greater than the depth of the rotor chamber 301, which is convenient for the installation and fixation of the upper torsion spring 5A and the lower torsion spring 5B. A high-pressure fluid chamber 304 and a low-pressure fluid chamber 305 are respectively provided. The rotor chamber 301 and the high-pressure fluid chamber 304 are connected at the upper scraper mounting groove 302. The upper part of the low-pressure fluid chamber 305 is connected to the rotor chamber 301, and the lower part of the low-pressure fluid chamber 305 is connected to the rotor chamber 301 near the lower scraper mounting groove 303. A low-pressure fluid input / output port 9 and a high-pressure fluid input / output port 8 are respectively provided on the side wall of the pump body 3. The low-pressure fluid input / output port 9 and the high-pressure fluid input / output port 8 are respectively connected to the low-pressure fluid chamber 305 and the high-pressure fluid chamber 304.

[0029] The upper scraper 2A and lower scraper 2B are positioned within the upper scraper mounting slots 302 and 303, respectively, with a tight fit, ensuring minimal internal leakage. The front ends of the upper scraper 2A and lower scraper 2B are secured within the upper scraper mounting slots 302 and 303, respectively, by upper torsion springs 5A and lower torsion springs 5B. The cam rotor 102 is positioned within the rotor cavity 301, with a tight fit between the cam rotor 102 and the rotor cavity 301. It should be noted that the volume of the low-pressure fluid chamber 305 and the low-pressure fluid inlet / outlet 9 is greater than the volume of the high-pressure fluid chamber 304 and the high-pressure fluid inlet / outlet 8.

[0030] The scraper-type permanent magnet synchronous motor electro-hydraulic coupler involved in this embodiment also includes a front bearing 11 and a rear bearing 12. The front bearing 11 is placed in the front shaft hole and the two are interference fit. The front shaft 101 is installed in the front bearing 11 and the two are clearance fit. The front shaft 101 rotates around the front bearing 11. The rear bearing 12 is placed in the rear shaft fixing groove and the two are interference fit. The rear shaft 103 is installed in the rear bearing 12 and the two are clearance fit. The rear shaft 103 rotates around the rear bearing 12.

[0031] The front rotating shaft 101 involved in this embodiment is sealed and passes through the front rotating shaft hole and is rotatably connected to the front rotating shaft hole, and then extends out of the pump body 3. Specifically, an FB-shaped sealing retaining ring 16 and a spring retaining ring 17 are fixed in sequence in the front rotating shaft hole at the front end of the front bearing shell 11. The front rotating shaft 101 passes through the front bearing shell 11, the FB-shaped sealing retaining ring 16, and the spring retaining ring 17 in sequence. The FB-shaped sealing retaining ring 16 and the spring retaining ring 17 realize the sealing between the front rotating shaft 101 and the front rotating shaft hole.

[0032] like Figure 7 As shown, the upper scraper 2A and the lower scraper 2B involved in this embodiment have the same structure, both including a cylindrical embedded portion 201 and a scraper portion 202, one side of the scraper portion 202 is fixed on the embedded portion 201, and the arc surface on the other side of the scraper portion 202 is pressed against the outer peripheral surface 1 of the cam rotor 102, the embedded portion 201 is installed in the upper scraper mounting groove 302 or the lower scraper mounting groove 303, and an annular groove 203 is provided on the outside of the end of the embedded portion 201 away from the end cover 6, the upper torsion spring 5A or the lower torsion spring 5B is sleeved in the annular groove 203, one end of the upper torsion spring 5A or the lower torsion spring 5B is fixed to the embedded portion 201, and the other end is fixed to the inner wall of the upper scraper mounting groove 302 or the lower scraper mounting groove 303. The upper torsion spring 5A or the lower torsion spring 5B applies an elastic force to the upper scraper 2A or the lower scraper 2B toward the rotor shaft 1, ensuring that the other side of the scraper portion 202 is pressed tightly against the outer peripheral surface 1 of the cam rotor 102, thereby improving the sealing performance. At the same time, when the rotor shaft 1 rotates, the rotor shaft and the scraper can always slide relative to each other and cannot self-lock.

[0033] like Figure 5-6As shown, the present embodiment involves embedding the winding 7 on the inner surface of the end cover 6, and correspondingly, embedding the permanent magnet pair 4 on the surface of the cam rotor 102 close to the winding 7. The winding 7 and the permanent magnet pair 4 correspond one-to-one, and the winding 7 is just placed on the outer periphery of the corresponding permanent magnet pair 4. Specifically, a plurality of annular grooves are provided on the inner surface of the end cover 6, and the wire is wound in the annular grooves to form the winding 7. When the winding 7 is energized, an annular magnetic field is formed in the pump cavity. A plurality of slots are provided on the surface of the rotor shaft 1 close to the winding 7. The annular grooves correspond one-to-one to the slots, and the annular grooves are placed on the outer periphery of the corresponding slots. The N-pole permanent magnet 401 and the S-pole permanent magnet 402 are embedded in the slots. The N-pole permanent magnet 401 and the S-pole permanent magnet 402 in the annularly arranged slots are arranged in the order of N, S, N, S..., to ensure that the magnetic pole sequence can be driven to rotate by the annular magnetic field, thereby driving the rotor shaft 1 to rotate.

[0034] The scraper-type permanent magnet synchronous motor electro-hydraulic coupler involved in this embodiment also includes a first sealing ring 10, which is placed exactly in the gap between the cam rotor 102 and the end cover 6 between the permanent magnet pair 4 and the winding 7, and can prevent the fluid in the pump chamber from flowing into the annular groove and the slot hole.

[0035] The end cover 6 involved in this embodiment is sealed and fixed at the open end of the pump chamber. Specifically, the second sealing ring 13 is fixed at the connection between the end cover 6 and the open end of the pump chamber, and the end cover 6 is fixed to the open end of the pump body 3 by the nut 14 and the bolt 15 to achieve a sealed connection between the two.

[0036] The outer peripheral shape of the cam rotor 102 of this embodiment is a cam profile, which can be a smooth ellipse, semi-ellipse, circle, cycloid or other profile or a combination of profiles. Figure 3 As shown, as an implementation, the cam rotor 102 is a five-blade rotor evenly distributed along the circumference, with arc-shaped peaks and cycloid-shaped valleys. The distance between each point on the cam profile and the circumferential wall of the rotor cavity 301 determines the shape and size of the pump cavity, and together with the outer diameter of the circumferential wall of the rotor cavity 301, determines the displacement of this invention. The two end faces of the cam rotor 102 face the bottom inner wall of the rotor cavity 301 and the inner surface of the end cover 3, respectively, with a small clearance between them to minimize internal leakage.

[0037] The pump body 16 is the main connecting and containing part of this embodiment and can be connected to the base in various ways. The pump body 3 is connected to the rotor shaft 1, the upper scraper 2A, the lower scraper 2B, the upper torsion spring 5A, and the lower torsion spring 5B to form the main part of the pump chamber. At the same time, the flow channel is divided into a high-pressure chamber and a low-pressure chamber. The upper scraper 2A, the cam rotor 102, and the rotor shaft 1 are used as boundaries. The pump chamber connected to the low-pressure fluid chamber on the left is the low-pressure chamber, and the pump chamber connected to the high-pressure fluid chamber on the right is the high-pressure chamber. The low-pressure chamber has a larger volume, and the high-pressure chamber has a smaller volume. The high-pressure chamber and the low-pressure chamber are respectively connected to the external high-pressure or low-pressure fluid pipeline. The sealed cavity between the rotor shaft 1 and the rotor chamber 301 is the trapped fluid chamber. The direction of rotation of the rotor shaft 1 determines the flow in and out of the high-pressure chamber and the low-pressure chamber, and at the same time determines the working state of the present invention.

[0038] During operation, the present invention converts mechanical energy, hydraulic energy, and electrical energy into each other in pairs. Any one form of energy can be simultaneously converted into the other two, and any two forms of energy can be simultaneously converted into the other. The conversion of any two energies into each other is the most basic operating mode, and the remaining operating modes are derivatives of this basic mode.

[0039] Basic working mode 1: mutual conversion of electrical energy and mechanical energy

[0040] When the present invention converts electrical energy into mechanical energy, it becomes an electric motor. At this time, by inputting AC power into the winding 7, the winding 7 and the end cover 6 combine to act as a stator, generating a rotating electromagnetic field. The N-pole permanent magnet 401 and the S-pole permanent magnet 402 embedded in the cam rotor 102 drive the rotor shaft 1 to rotate. The extended end of the rotor shaft 1 is then connected to other devices to output mechanical energy, achieving the conversion of electrical energy into mechanical energy. When the present invention converts mechanical energy into electrical energy, it becomes a generator. An external power device is connected to the extended end of the rotor shaft 1 to drive the rotor shaft 1 to rotate. The permanent magnets of the cam rotor 102 rotate to generate a rotating electromagnetic field. The magnetic field strength of the winding 7 and the end cover 6 changes, and the winding 7 generates a synchronous induced voltage that is output externally through the lead wire, achieving the conversion of mechanical energy into electrical energy.

[0041] Basic working mode 2: mutual conversion of electrical energy and hydraulic energy

[0042] When the present invention converts electrical energy into hydraulic energy, it functions in the same way as a motor-hydraulic pump combination system. External AC power is input, and the winding 7 and end cap 6 generate a rotating electromagnetic field. This, through the N-pole permanent magnet 401 and S-pole permanent magnet 402 embedded in the cam rotor 102, drives the rotor shaft 1 to rotate, driving the upper scraper 2A and lower scraper 2B to rotate synchronously. Under the action of the upper torsion spring 5A and lower torsion spring 5B, the upper scraper 2A and lower scraper 2B are always pressed against the outer peripheral surface of the cam rotor. The higher the fluid pressure, the greater the pressure between the scraper and the middle shaft end of the rotor shaft 1, and the better the sealing effect. As the rotor shaft 1 rotates, the low-pressure fluid in the larger low-pressure fluid chamber 305 is pressed into the smaller high-pressure fluid chamber 304 and converted into high-pressure fluid. As the rotor shaft 1 continues to rotate, the low-pressure fluid is continuously drawn into the low-pressure chamber, and the high-pressure fluid is continuously expelled from the high-pressure chamber, achieving the conversion of electrical energy into hydraulic energy. When the present invention converts hydraulic energy into electrical energy, it has the same function as a hydraulic motor-generator combination system. High-pressure fluid continuously enters the pump chamber from the high-pressure fluid chamber 304, and low-pressure fluid is continuously output from the low-pressure fluid chamber 305. The fluid power drives the rotor shaft 1 to rotate, and the permanent magnet of the cam rotor 102 rotates, generating a rotating electromagnetic field. The magnetic field strength of the winding 7 and the end cover 6 changes, and the winding 7 generates a synchronous induced voltage and outputs it externally through the lead, realizing the conversion of hydraulic energy into electrical energy.

[0043] Basic working mode three: mutual conversion of mechanical energy and hydraulic energy

[0044] When the present invention converts mechanical energy into hydraulic energy, it becomes a hydraulic pump. External power drives the rotor shaft 1 through the extended end, driving the upper scraper 2A and lower scraper 2B to rotate synchronously. Under the action of the upper torsion spring 5A and lower torsion spring 5B, the upper scraper 2A and lower scraper 2B are always pressed against the outer circumference of the cam rotor. The higher the fluid pressure, the greater the pressure between the swinging scraper and the cam rotor, and the better the sealing effect. As the rotor shaft 1 rotates, the low-pressure fluid in the larger low-pressure fluid chamber 305 is pressed into the smaller high-pressure fluid chamber 304, becoming high-pressure fluid. As the rotor shaft 1 continues to rotate, the low-pressure fluid is continuously drawn into the low-pressure chamber, and the high-pressure fluid is continuously expelled from the high-pressure chamber, achieving the conversion of mechanical energy into hydraulic energy. When the present invention converts hydraulic energy into mechanical energy, it becomes a hydraulic motor. High-pressure fluid continuously enters the pump chamber from the high-pressure fluid chamber 304, and low-pressure fluid is continuously output from the low-pressure fluid chamber 305. The fluid power drives the rotor shaft 1 to rotate, and then mechanical energy is transmitted outward through the protruding end of the rotor shaft 1, realizing the conversion of hydraulic energy into mechanical energy.

[0045] Example 2

[0046] Except for the following mechanisms, the rest of this embodiment is the same as that of embodiment 1.

[0047] The present embodiment involves embedding a winding 7 on the inner wall of the bottom of the pump chamber, and correspondingly, embedding a permanent magnet pair 4 on the surface of the rotor shaft 102 close to the winding 7. The winding 7 and the permanent magnet pair 4 correspond one-to-one, and the winding 7 is just placed on the outer periphery of the corresponding permanent magnet pair 4. Specifically, a plurality of annular grooves are provided on the inner wall of the bottom of the rotor chamber 301, and the wire is wound in the annular groove to form the winding 7. When the winding 7 is energized, an annular magnetic field will be formed in the pump chamber. A plurality of slots are provided on the surface of the rotor shaft 1 away from the end cover. The annular grooves correspond one-to-one to the slots, and the annular grooves are placed on the outer periphery of the corresponding slots. The N-pole permanent magnet 401 and the S-pole permanent magnet 402 are embedded in the slots. The N-pole permanent magnet 401 and the S-pole permanent magnet 402 in the annularly arranged slots are arranged in the order of N, S, N, S..., to ensure that the magnetic pole sequence can be driven to rotate by the annular magnetic field, thereby driving the rotor shaft 1 to rotate.

Claims

1. A scraper type permanent magnet synchronous motor electro-hydraulic coupler, characterized in that: Its main structure includes a rotor shaft, a scraper, a pump body, a permanent magnet pair, a torsion spring, an end cover, a winding, a high-pressure fluid input / output port and a low-pressure fluid input / output port, wherein the scraper is divided into an upper scraper and a lower scraper, the permanent magnet pair includes an N-pole permanent magnet and an S-pole permanent magnet, and the torsion spring is divided into an upper torsion spring and a lower torsion spring; a pump chamber is opened in the pump body, one end of the pump chamber is open, and the end cover is sealed and fixed to the open end of the pump chamber; the rotor shaft is a stepped shaft, including a front rotating shaft, a cam rotor and a rear rotating shaft connected in sequence; the cam rotor is a blade-type structure, a front rotating shaft hole is opened in the center of the bottom of the pump chamber, and a rear rotating shaft fixing groove is opened on the inner surface of the end cover; the cam rotor is installed in the pump chamber and has a certain rotational gap between it and the pump chamber; the front rotating shaft seal passes through the front rotating shaft hole and is rotatably connected to it and then extends out of the pump body; the rear rotating shaft is rotatably connected to the rear rotating shaft fixing groove; the upper scraper and the lower scraper are respectively placed on the rotor shaft The pump chambers on the lower two sides, together with the rotor shaft, are divided into a low-pressure chamber on the left and a high-pressure chamber on the right. The low-pressure chamber and the high-pressure chamber are connected to the low-pressure fluid input / output port and the high-pressure fluid input / output port respectively. The volume of the low-pressure chamber is larger than that of the high-pressure chamber. The front ends of the upper scraper and the lower scraper are fixed to the inner wall of the pump chamber by the upper torsion spring and the lower torsion spring respectively. The upper torsion spring and the lower torsion spring respectively apply an elastic force pointing to the axis of the rotor shaft to the upper scraper and the lower scraper. A winding is embedded in the inner surface of the end cover or the inner wall of the bottom of the pump chamber. Correspondingly, a permanent magnet pair is embedded in the surface of the rotor shaft close to the winding. The winding and the permanent magnet pair correspond one to one, and the winding is just placed on the outer periphery of the corresponding permanent magnet pair. When the rotor shaft rotates, the upper scraper and the lower scraper swing and their free ends are always pressed against the outer periphery of the rotor shaft, scraping the fluid on the surface of the rotor shaft to realize the conversion of the fluid between the high-pressure chamber and the low-pressure chamber.

2. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: The pump chamber includes a cylindrical rotor chamber, an upper scraper mounting groove, a lower scraper mounting groove, a high-pressure fluid chamber and a low-pressure fluid chamber. The rotor chamber is opened on the pump body, and the upper scraper mounting groove and the lower scraper mounting groove are respectively opened on the inner wall of the pump chamber on the upper and lower sides of the rotor chamber. The depth of the upper scraper mounting groove and the lower scraper mounting groove is greater than the depth of the rotor chamber. The high-pressure fluid chamber and the low-pressure fluid chamber are respectively opened on the pump body on the left and right sides of the rotor chamber. The rotor chamber and the high-pressure fluid chamber are connected at the upper scraper mounting groove, the upper part of the low-pressure fluid chamber is connected to the rotor chamber, and the lower part of the low-pressure fluid chamber is connected at the lower scraper mounting groove. The groove is connected with the rotor cavity, and a low-pressure fluid input / output port and a high-pressure fluid input / output port are respectively opened on the side wall of the pump body. The low-pressure fluid input / output port and the high-pressure fluid input / output port are respectively connected with the low-pressure fluid cavity and the high-pressure fluid cavity. The upper scraper and the lower scraper are respectively placed in the upper scraper mounting groove and the lower scraper mounting groove and are matched with a small gap. The front ends of the upper scraper and the lower scraper are respectively fixed in the upper scraper mounting groove and the lower scraper mounting groove by an upper torsion spring and a lower torsion spring. The cam rotor is placed in the rotor cavity, and there is a small gap between the cam rotor and the rotor cavity.

3. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: It also includes a front bearing and a rear bearing. The front bearing is placed in the front shaft hole and the two are interference fit. The front shaft is installed in the front bearing and the two are clearance fit. The front shaft rotates around the front bearing. The rear bearing is placed in the rear shaft fixing groove and the two are interference fit. The rear shaft is installed in the rear bearing and the two are clearance fit. The rear shaft rotates around the rear bearing.

4. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 3, characterized in that: An FB-shaped sealing retaining ring and a spring retaining ring are fixed in sequence in the front rotating shaft hole at the front end of the front bearing shell, and the front rotating shaft passes through the front bearing shell, the FB-shaped sealing retaining ring and the spring retaining ring in sequence.

5. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 2, characterized in that: The upper scraper and the lower scraper have the same structure, both including a cylindrical embedded portion and a scraper portion. One side of the scraper portion is fixed on the embedded portion, and the arc surface on the other side of the scraper portion is pressed against the outer peripheral surface of the cam rotor. The embedded portion is installed in the upper scraper mounting groove or the lower scraper mounting groove. An annular groove is provided on the outside of the end of the embedded portion away from the end cover, and the upper torsion spring or the lower torsion spring is sleeved in the annular groove. One end of the upper torsion spring or the lower torsion spring is fixed to the embedded portion, and the other end is fixed to the inner wall of the upper scraper mounting groove or the lower scraper mounting groove.

6. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: A number of annular grooves are provided on the inner surface of the end cover or the inner wall of the bottom of the rotor cavity. The wires are wound in the annular grooves to form windings. When the windings are energized, an annular magnetic field is formed in the pump cavity. A number of slots are provided on the surface of the rotor shaft on one side close to the windings. The annular grooves correspond to the slots one by one, and the annular grooves are placed on the outer periphery of the corresponding slots. The N-pole permanent magnets and the S-pole permanent magnets are embedded in the slots. The N-pole permanent magnets and the S-pole permanent magnets in the annularly arranged slots are arranged in the order of N, S, N, S..., to ensure that the magnetic pole sequence can be driven to rotate by the annular magnetic field, thereby driving the rotor shaft to rotate.

7. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: The first sealing ring is placed just at the gap between the cam rotor and the end cover between the permanent magnet pair and the winding.

8. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: The second sealing ring is fixed at the connection between the end cover and the open end of the pump chamber, and the end cover is fixed to the open end of the pump body by nuts and bolts.

9. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: The outer peripheral shape of the cam rotor is a cam profile, which can be a smooth ellipse, semi-ellipse, circle, cycloid or a combination of profiles.

10. The scraper type permanent magnet synchronous machine electro-hydraulic coupler according to claim 1, characterized in that: The cam rotor is a five-blade rotor evenly distributed along the circumference, with the blade peaks being circular arcs and the blade valleys being cycloids.

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