A high-pressure, pulsation-free hydraulic pump based on an electromagnetic speed regulating valve

Abstract

The present invention relates to the field of vibration control technology, and specifically to a high-pressure pulsation-free hydraulic pump based on an electromagnetic speed control valve, comprising a fuel tank, a hydraulic pump body, a directional valve and an oil inlet pipe, an oil outlet pipe assembly being fixedly arranged on the side wall of the directional valve away from the oil inlet pipe, and an electromagnetic speed control valve being sealed at the end of the oil outlet pipe assembly away from the directional valve. A pulsation absorption structure for suppressing the vibration of the pipeline caused by the internal pressure of the high-pressure fluid is arranged in the outlet pipe of the high-pressure hydraulic pump, and a flow-blocking ring and an annular guide ring are arranged at one end of the pipeline, so as to change the instantaneous flow velocity of the fluid, and a flow-cutting unit is arranged by utilizing the impact force of the fluid itself, so as to divide the fluid and thus change the flow state of the fluid. When its flow state changes, the pulsation frequency generated thereby will also change, thereby avoiding the phenomenon that the pressure pulsation generated inside the fluid and the natural frequency of the hydraulic pipeline are the same or close to each other, thereby reducing the possibility of pipeline rupture.

Description

Technical Field

[0001] The invention relates to the technical field of vibration control, in particular to a high-pressure pulsation-free hydraulic pump based on an electromagnetic speed regulating valve. Background Art

[0002] The hydraulic pump's working volume in aviation high-pressure hydraulic piping systems undergoes periodic changes, causing its instantaneous flow rate to pulsate. This flow rate pulsation is converted into pressure pulsation by the fluid pipeline impedance, acting as pulsating stress on the solid pipeline's inner wall. When the hydraulic pipeline's natural frequency and the pressure pulsation's natural frequency are equal or close, coupled vibrations can occur. This vibration can easily shorten the service life of hydraulic accessories and cause pipeline ruptures, leading to failure of the entire hydraulic pipeline. To this end, Chinese industry researchers are continuously exploring and researching active control of high-pressure hydraulic pump pressure pulsation that can suppress low-frequency vibrations.

[0003] Among them, the invention patent with application number 202111437908.5 discloses a hydraulic pump outlet pressure pulsation vibration elimination device, which adopts the active control of the divided inlet flow to reduce the vibration of the pump source round head and suppress the vibration of the high-pressure hydraulic pump fluid pressure pulsation on the pipeline. However, when the above patent is used, although it can actively suppress the pressure pulsation in the fluid, it cannot completely eliminate it. At the same time, it cannot change the flow state of the fluid inside the pipeline, and thus cannot change its pulsation frequency, resulting in some fluids still generating pressure pulsations on the inner wall of the pipeline, thereby shortening the service life of the pipeline, and there is still room for improvement. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a high-pressure, pulsation-free hydraulic pump based on an electromagnetic speed control valve. A pulsation absorption structure is set in the outlet pipe of the high-pressure hydraulic pump to suppress the vibration of the pipe caused by the internal pressure of the high-pressure fluid. At the same time, a flow-blocking ring and an annular guide ring are set at one end of the pipe, which can change the instantaneous flow velocity of the fluid. At the same time, a cutting flow unit is set by utilizing the impact force of the fluid itself to divide the fluid, thereby changing the flow state of the fluid. When its flow state changes, the pulsation frequency generated will also change, thereby avoiding the phenomenon that the pressure pulsation generated inside the fluid and the natural frequency of the hydraulic pipeline are the same or close, thereby reducing the possibility of pipeline rupture.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a high-pressure, pulsation-free hydraulic pump based on an electromagnetic speed regulating valve, comprising an oil tank, a hydraulic pump body fixedly mounted on the upper end of the oil tank, a directional valve fixedly mounted on the output end of the hydraulic pump body, and an oil inlet pipe for connecting the oil tank and the directional valve, an oil outlet pipe assembly fixedly mounted on the side wall of the directional valve away from the oil inlet pipe, and an end of the oil outlet pipe assembly away from the directional valve being sealably connected to the electromagnetic speed regulating valve;

[0006] The oil outlet pipe assembly includes a first connecting unit, a first connecting unit is fixedly provided on the side wall of the directional valve away from the oil inlet pipe, the end of the first connecting unit away from the directional valve is connected to the second connecting unit, the end of the second connecting unit away from the first connecting unit is fixedly connected to the middle oil pipe, the outer wall of the middle oil pipe is evenly provided with pulsation absorption units along its circumference, a cutting flow unit is coaxially installed inside the middle oil pipe, the cutting flow unit is fixedly connected to the inner wall of the middle oil pipe, the end of the middle oil pipe away from the second connecting unit is fixedly connected to the oil outlet pipe, and the oil outlet pipe is sealed and connected to the electromagnetic speed control valve through a flange.

[0007] Preferably, the first connecting unit includes a first connecting pipe, which is fixedly installed on the side wall of the directional valve away from the oil inlet pipe, a threaded section is provided on the outside of the first connecting pipe and at the end away from the directional valve, an inner connecting pipe is fixedly provided on the coaxial line in the middle of the inner side of the first connecting pipe, an annular groove is provided inside the end of the inner connecting pipe away from the directional valve, and a sealing tube is slidably installed inside the annular groove through a compression spring.

[0008] Preferably, the second connecting unit includes a plug-in tube, which is fixedly installed on the side wall of the end of the middle oil pipe close to the directional valve, and an internal threaded sleeve is rotatably connected to the outer side of the end of the middle oil pipe close to the directional valve, and the outer side wall of the internal threaded sleeve is evenly provided with concave grooves along its circumference.

[0009] Preferably, a sealing ring is fixedly provided on the end of the plug-in tube close to the inner connecting pipe, and the outer diameter of the plug-in tube is equal to the inner diameter of the first connecting pipe.

[0010] Preferably, a mounting ring plate is fixedly provided on the outer wall of the middle oil pipe near the end, and mounting through holes are evenly opened on the mounting ring plate along its circumference.

[0011] Preferably, the outer wall of the middle oil pipe and the position located between the two mounting ring plates are uniformly provided with pulse through holes along the circumference thereof, and an overflow hole is uniformly provided on one side of the pulse through hole and the position located between the two mounting ring plates along the circumference of the outer wall of the middle oil pipe, and the inner diameter of the overflow hole gradually decreases from the outside to the inside of the middle oil pipe.

[0012] Preferably, a flow-blocking ring is fixedly installed inside the medium oil pipe near the plug-in tube, and an annular flow-guiding ring is fixedly provided on the side wall of the flow-blocking ring near the plug-in tube. The cross section of the annular flow-guiding ring is trapezoidal and triangular.

[0013] Preferably, the pulsation absorbing unit includes a positioning ring, which is fixedly provided on the outer wall of the middle oil pipe and close to the mounting ring plate, and arc-shaped mounting blocks are evenly installed on the outer side of the positioning ring along its circumference, and a sealing shell is fixedly connected between the arc-shaped mounting blocks, and the sealing shell and the outer wall of the middle oil pipe are sealed. An arc-shaped damper is fixedly installed in the middle of the inner wall of the sealing shell, and the arc-shaped damper is fixedly installed on the outer wall of the middle oil pipe away from the side wall of the sealing shell, and guide holes are evenly opened in the middle of the arc damper along its arc direction, and an elastic bladder is fixedly provided on the inner wall of the sealing shell and close to the pulse through hole, and support springs for making the elastic bladder abut against the end of the pulse through hole are evenly provided inside the elastic bladder.

[0014] Preferably, an alignment through hole is provided on the arc-shaped mounting block at a position corresponding to the mounting through hole.

[0015] Preferably, the flow cutting unit includes a concentric disk, which is fixedly installed at a position inside the oil pipe near the electromagnetic speed regulating valve, and the concentric disk is evenly provided with flow grooves along its circumference. A T-shaped rod is slidably installed in the middle of the concentric disk, and a limit plate is fixedly provided in the middle of the T-shaped rod. An oscillation spring is provided on the T-shaped rod between the limit plate and the concentric disk, and a diffuser is fixedly provided at the end of the T-shaped rod close to the concentric disk, and a flow cutting blade is evenly installed along its circumference at the end of the T-shaped rod away from the concentric disk.

[0016] Beneficial effects of the present invention:

[0017] 1. By setting a pulsation absorption unit in the outlet pipe of the high-pressure hydraulic pump to suppress the vibration of the pipe caused by the internal pressure of the high-pressure fluid, the flexible bladder membrane and the support spring can cooperate with each other, and the arc damper can absorb the pulsation inside the fluid while reducing the fluid flow rate, thereby achieving the purpose of eliminating the internal pressure pulsation of the fluid, thereby extending the service life of the pipe and ensuring the normal operation of the entire hydraulic system;

[0018] 2. The flow-blocking ring can cooperate with the annular guide ring. When the fluid hits the inclined surface of the annular guide ring, the fluid at its edge will be redirected to the middle, thereby reducing the impact of the fluid on the inner wall of the middle oil pipe and accelerating its flow rate. After the fluid flows through the flow-blocking ring, the inner diameter of the middle oil pipe 53 is larger than that of the flow-blocking ring 535, so the fluid flow rate will slow down again. This changes the flow state of the fluid, thereby avoiding the phenomenon that the pressure pulsation generated inside the fluid is close to the natural frequency of the hydraulic pipeline, thereby reducing the possibility of pipeline rupture.

[0019] 3. The cutting flow unit can use the impact force of the fluid to drive the cutting flow blade to move according to the fluid flow rate, thereby changing its position to achieve the purpose of dividing the fluid and changing the flow state of the fluid. When its flow state changes, the pulsation frequency it generates will also change, thereby avoiding the phenomenon that the pressure pulsation generated inside the fluid is the same as the natural frequency of the hydraulic pipeline, further improving the service life of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the oil outlet pipe assembly in the present invention;

[0023] Figure 3 is a schematic diagram of a sectional three-dimensional structure of the first connecting unit and the second connecting unit in the present invention;

[0024] Figure 4 In the present invention Figure 3 A schematic diagram of the enlarged structure at point A;

[0025] Figure 5 It is a top view of the middle oil pipe, pulsation absorption unit and outflow pipe in the present invention;

[0026] Figure 6 In the present invention Figure 5 BB-direction cross-sectional three-dimensional structure diagram;

[0027] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the oil pipe, the pulsation absorption unit and the shear flow unit in the present invention;

[0028] Figure 8 In the present invention Figure 7 Schematic diagram of the enlarged structure at C;

[0029] Figure 9 In the present invention Figure 7 Enlarged structural diagram at D.

[0030] In the picture:

[0031] 1. Fuel tank; 2. Hydraulic pump body; 3. Directional valve; 4. Oil inlet pipe;

[0032] 5. Oil outlet pipe assembly; 51. First connecting unit; 511. First connecting pipe; 512. Threaded section; 513. Internal connecting pipe; 514. Compression spring; 515. Sealing pipe;

[0033] 52, second connecting unit; 521, plug-in tube; 5211, sealing ring; 522, internally threaded sleeve; 523, concave groove;

[0034] 53, oil pipe; 531, mounting ring plate; 532, mounting through hole; 533, pulse through hole; 534, overflow hole; 535, flow blocking ring; 536, annular guide ring;

[0035] 54. Pulsation absorbing unit; 541. Positioning ring; 542. Arc-shaped mounting block; 5421. Alignment through hole; 543. Sealing housing; 544. Arc-shaped damper; 545. Diversion hole; 546. Elastic bladder; 547. Support spring;

[0036] 55. Flow cutting unit; 551. Concentric plate; 552. Flow channel; 553. T-bar; 554. Diffuser; 555. Limit plate; 556. Oscillation spring; 557. Flow cutting blade;

[0037] 56. Outlet pipe; 6. Solenoid speed control valve. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0039] Example 1: See Figures 1 to 4 A high-pressure, pulsation-free hydraulic pump based on an electromagnetic speed control valve comprises an oil tank 1, a hydraulic pump body 2 fixedly mounted on the upper end of the oil tank 1, a directional valve 3 fixedly mounted at the output end of the hydraulic pump body 2, and an oil inlet pipe 4 for connecting the oil tank 1 and the directional valve 3. An oil outlet pipe assembly 5 is fixedly mounted on the side wall of the directional valve 3 away from the oil inlet pipe 4, and an electromagnetic speed control valve 6 is sealed and connected to the end of the oil outlet pipe assembly 5 away from the directional valve 3.

[0040] The oil outlet pipe assembly 5 includes a first connecting unit 51 , which is fixedly provided on the side wall of the directional valve 3 away from the oil inlet pipe 4 , and a second connecting unit 52 is connected to the end of the first connecting unit 51 away from the directional valve 3 .

[0041] The first connecting unit 51 includes a first connecting pipe 511, which is fixedly installed on the side wall of the directional valve 3 away from the oil inlet pipe 4. A threaded section 512 is provided on the outside of the first connecting pipe 511 and at the end away from the directional valve 3. An inner connecting pipe 513 is fixedly coaxially arranged in the middle of the inner side of the first connecting pipe 511. An annular groove is provided inside the end of the inner connecting pipe 513 away from the directional valve 3, and a sealing tube 515 is slidably installed inside the annular groove through a compression spring 514.

[0042] The second connecting unit 52 includes a plug-in tube 521, and the plug-in tube 521 is fixedly installed on the side wall of the end of the middle oil pipe 53 close to the directional valve 3. The outer side of the end of the middle oil pipe 53 close to the directional valve 3 is rotatably connected to an internal threaded sleeve 522, and the outer side wall of the internal threaded sleeve 522 is evenly provided with concave grooves 523 along its circumference.

[0043] A sealing ring 5211 is fixedly provided at the end of the plug-in pipe 521 close to the inner connecting pipe 513 , and the outer diameter of the plug-in pipe 521 is equal to the inner diameter of the first connecting pipe 511 .

[0044] During the specific operation, the plug-in tube 521 is manually aligned with the first connecting pipe 511 and inserted. At this time, the plug-in tube 521 will continue to move toward the sealing tube 515. When the plug-in tube 521 contacts the sealing tube 515, with the continuous manual push, the plug-in tube 521 will drive the sealing tube 515 to move into the annular groove, the compression spring 514 is compressed, and the sealing ring 5211 can make the plug-in tube 521 and the sealing tube 515 sealed and connected. Then, the internal threaded sleeve 522 is manually rotated so that the internal threaded sleeve 522 and the threaded section 512 at the end of the first connecting pipe 511 are matched and installed, and finally the fixed installation process between the first connecting pipe 511 and the plug-in tube 521 is completed.

[0045] Example 2: The technical solution is basically the same as that of Example 1, see Figure 2 、 Figure 5 as well as Figures 6 to 9 The difference is that: the oil outlet pipe assembly 5 also includes a middle oil pipe 53, the end of the second connecting unit 52 away from the first connecting unit 51 is fixedly connected to the middle oil pipe 53, the outer wall of the middle oil pipe 53 is evenly provided with pulsation absorption units 54 along its circumference, and a cutting flow unit 55 is coaxially installed inside the middle oil pipe 53. The cutting flow unit 55 is fixedly connected to the inner wall of the middle oil pipe 53, and the end of the middle oil pipe 53 away from the second connecting unit 52 is fixedly connected to the oil outlet pipe 56, and the oil outlet pipe 56 is sealed and connected to the electromagnetic speed control valve 6 through a flange.

[0046] A mounting ring plate 531 is fixedly provided on the outer wall of the middle oil pipe 53 near the end, and mounting through holes 532 are evenly opened on the mounting ring plate 531 along its circumference. A pulse through hole 533 is evenly opened on the outer wall of the middle oil pipe 53 and located between the two mounting ring plates 531 along its circumference. An overflow hole 534 is evenly opened on one side of the pulse through hole 533 and located between the two mounting ring plates 531 along the circumference of the outer wall of the middle oil pipe 53. The inner diameter of the overflow hole 534 gradually decreases from the outside to the inside of the middle oil pipe 53. A flow blocking ring 535 is fixedly installed on the inside of the middle oil pipe 53 near the plug-in tube 521. An annular guide ring 536 is fixedly provided on the side wall of the flow blocking ring 535 near the plug-in tube 521. The cross-section of the annular guide ring 536 is trapezoidal and triangular.

[0047] The pulsation absorption unit 54 includes a positioning ring 541, a positioning ring 541 is fixedly provided on the outer wall of the middle oil pipe 53 and close to the mounting ring plate 531, and a positioning through hole 5421 is opened on the arc-shaped mounting block 542 at a position corresponding to the mounting through hole 532. The outer side of the positioning ring 541 is evenly mounted with arc-shaped mounting blocks 542 along its circumference, and a sealing shell 543 is fixedly connected between the arc-shaped mounting blocks 542. The sealing shell 543 and the outer wall of the middle oil pipe 53 are sealed and connected. An arc-shaped damper 544 is fixedly installed in the middle of the inner wall of the body 543. The arc-shaped damper 544 is fixedly installed on the outer wall of the middle oil pipe 53 away from the side wall of the sealing shell 543. A guide hole 545 is evenly opened in the middle of the arc damper 544 along its arc direction. An elastic sac membrane 546 is fixedly provided on the inner wall of the sealing shell 543 and close to the pulse through hole 533. Support springs 547 are evenly arranged inside the elastic sac membrane 546 for making the elastic sac membrane 546 abut against the end of the pulse through hole 533.

[0048] The cutting flow unit 55 includes a concentric disc 551, which is fixedly installed at a position near the electromagnetic speed control valve 6 inside the middle oil pipe 53. Flow grooves 552 are evenly opened on the concentric disc 551 along its circumference. A T-shaped rod 553 is slidably installed in the middle of the concentric disc 551, and a limit plate 555 is fixedly set in the middle of the T-shaped rod 553. An oscillation spring 556 is sleeved on the T-shaped rod 553 between the limit plate 555 and the concentric disc 551. A diffuser 554 is fixedly installed at the end of the T-shaped rod 553 near the concentric disc 551, and a cutting flow blade 557 is evenly installed along its circumference at the end of the T-shaped rod 553 away from the concentric disc 551.

[0049] During operation, the hydraulic pump body 2 is started, and the hydraulic pump body 2 continuously draws the fluid from the oil tank 1 and sequentially passes through the oil inlet pipe 4, the directional valve 3, the first connecting unit 51 and the second connecting unit 52 and enters the middle oil pipe 53. The fluid then flows through the flow groove 552 and the oil outlet pipe 56 into the electromagnetic speed regulating valve 6, and is finally discharged into the designated pipeline through the electromagnetic speed regulating valve 6. The flow rate of the outlet pipeline can be controlled by controlling the electromagnetic speed regulating valve 6.

[0050] When the flow rate of the fluid extracted by the hydraulic pump body 2 changes, flow pulsation will occur inside the fluid, and the flow pulsation will be converted into pressure pulsation to act on the inner wall of the pipe. At this time, under the action of the annular guide ring 536, the fluid will flow along the inclined surface of the annular guide ring 536 and through the baffle ring 535 into the middle oil pipe 53. At the moment when the fluid hits the inclined surface of the annular guide ring 536, the edge fluid will be redirected to the middle, thereby reducing the impact of the fluid on the inner wall of the middle oil pipe 53 and accelerating its flow rate. After the fluid flows through the baffle ring 535, since the inner diameter of the middle oil pipe 53 is larger than the inner diameter of the baffle ring 535, the fluid flow rate will slow down again. If the fluid When pressure pulsation occurs internally, the fluid enters the sealed housing 543 through the pulse through-hole 533 and acts on the elastic bladder 546. Due to the presence of the support spring 547, the elastic bladder 546 can deform at will. After entering the sealed housing 543, the fluid passes through the guide hole 545 provided on the arc damper 544. During this process, the arc damper 544 can absorb the internal pulsation of the fluid while reducing the fluid flow rate, thereby eliminating the internal pressure pulsation. Finally, the fluid is discharged into the middle oil pipe 53 again through the overflow hole 534, and finally discharged into the electromagnetic speed control valve 6 through the flow groove 552 and the oil outlet pipe 56.

[0051] When the fluid flow in the middle oil pipe 53 increases, the impact of the fluid on the diffuser 554 will drive the T-shaped rod 553 and the limit plate 555 to move to the right. At this time, the oscillation spring 556 is compressed, and the T-shaped rod 553 will drive the cutting blade 557 to move to the right synchronously. When the fluid flow in the middle oil pipe 53 decreases, the reaction force of the oscillation spring 556 will drive the T-shaped rod 553 and the limit plate 555 to move to the left. At this time, the cutting blade 557 moves to the left synchronously. The fluid will be cut. The moment the fluid contacts the cutting blade 557, the cutting blade 557 will separate the fluid and change the instantaneous flow direction of the surrounding fluid. The fluids cut by two adjacent cutting blades 557 will offset each other's internal fluid impact, thereby changing the flow state of the fluid. When its flow state changes, the pulsation frequency generated will also change, thereby avoiding the phenomenon that the pressure pulsation generated inside the fluid and the natural frequency of the hydraulic pipeline are the same or close, thereby reducing the possibility of pipeline rupture.

[0052] The working principle of the present invention when in use:

[0053] One: Manually align the plug-in tube 521 with the first connecting pipe 511 and insert it. At this time, the plug-in tube 521 will continue to move toward the sealing tube 515. When the plug-in tube 521 contacts the sealing tube 515, with the continued manual push, the plug-in tube 521 will drive the sealing tube 515 to move into the annular groove, the compression spring 514 is compressed, and the sealing ring 5211 can seal the plug-in tube 521 and the sealing tube 515. Then, manually rotate the internally threaded sleeve 522 so that the internally threaded sleeve 522 and the threaded section 512 at the end of the first connecting pipe 511 are matched and installed, finally completing the fixed installation process between the first connecting pipe 511 and the plug-in tube 521;

[0054] 2. After the above step 1 is completed, the hydraulic pump body 2 is started. The hydraulic pump body 2 continuously pumps the fluid from the oil tank 1 and sequentially passes through the oil inlet pipe 4, the directional valve 3, the first connecting unit 51 and the second connecting unit 52 and enters the middle oil pipe 53. Then, the fluid flows into the electromagnetic speed regulating valve 6 through the flow groove 552 and the oil outlet pipe 56, and is finally discharged into the designated pipeline through the electromagnetic speed regulating valve 6. The flow rate of the outlet pipeline can be controlled by controlling the electromagnetic speed regulating valve 6.

[0055] 3. When the flow rate of the fluid extracted from the hydraulic pump body 2 changes, flow pulsation will occur inside the fluid, and the flow pulsation will be converted into pressure pulsation acting on the inner wall of the pipe. At this time, under the action of the annular guide ring 536, the fluid will flow along the inclined surface of the annular guide ring 536 and through the baffle ring 535 into the middle oil pipe 53. At the moment when the fluid hits the inclined surface of the annular guide ring 536, the edge fluid will be redirected to the middle, thereby reducing the impact of the fluid on the inner wall of the middle oil pipe 53 and accelerating its flow rate. After the fluid flows through the baffle ring 535, since the inner diameter of the middle oil pipe 53 is larger than the inner diameter of the baffle ring 535, the fluid flow rate will slow down again. If the fluid When pressure pulsation occurs inside the body, the fluid will enter the sealed housing 543 through the pulse through hole 533 and act on the elastic bladder 546. Due to the presence of the support spring 547, the elastic bladder 546 can deform at will. After entering the sealed housing 543, the fluid will pass through the guide hole 545 provided on the arc damper 544. During this process, the arc damper 544 can absorb the pulsation inside the fluid while reducing the fluid flow rate, thereby eliminating its internal pressure pulsation. Finally, the fluid is discharged into the middle oil pipe 53 again through the overflow hole 534, and finally discharged into the electromagnetic speed control valve 6 through the flow groove 552 and the oil outlet pipe 56.

[0056] Fourth: When the fluid flow in the middle oil pipe 53 increases, the impact of the fluid on the diffuser 554 will drive the T-shaped rod 553 and the limit plate 555 to move to the right. At this time, the oscillation spring 556 is compressed, and the T-shaped rod 553 will drive the cutting blade 557 to move to the right synchronously. When the fluid flow in the middle oil pipe 53 decreases, the reaction force of the oscillation spring 556 will drive the T-shaped rod 553 and the limit plate 555 to move to the left. At this time, the cutting blade 557 moves to the left synchronously. The fluid will be cut in the middle. At the moment the fluid contacts the cutting blade 557, the cutting blade 557 will separate the fluid and change the instantaneous flow direction of the surrounding fluid. The fluids cut by two adjacent cutting blades 557 will offset each other's internal fluid impact, thereby changing the flow state of the fluid. When its flow state changes, the pulsation frequency generated will also change, thereby avoiding the phenomenon that the pressure pulsation generated inside the fluid and the natural frequency of the hydraulic pipeline are the same or close, thereby reducing the possibility of pipeline rupture.

[0057] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure, non-pulsating hydraulic pump based on an electromagnetic speed regulating valve, comprising an oil tank (1), a hydraulic pump body (2) fixedly mounted on the upper end of the oil tank (1), a directional valve (3) fixedly arranged at the output end of the hydraulic pump body (2), and an oil inlet pipe (4) for connecting the oil tank (1) and the directional valve (3), characterized in that: An oil outlet pipe assembly (5) is fixedly provided on the side wall of the directional valve (3) away from the oil inlet pipe (4), and an end of the oil outlet pipe assembly (5) away from the directional valve (3) is sealedly connected to an electromagnetic speed regulating valve (6); The oil outlet pipe assembly (5) includes A first connecting unit (51) is fixedly provided on a side wall of the directional valve (3) away from the oil inlet pipe (4). A second connecting unit (52), wherein the end of the first connecting unit (51) away from the directional valve (3) is connected to the second connecting unit (52); A middle oil pipe (53), an end of the second connecting unit (52) away from the first connecting unit (51) is fixedly connected to the middle oil pipe (53); Pulsation absorbing units (54), the outer wall of the middle oil pipe (53) is evenly provided with pulsation absorbing units (54) along its circumference; A cutting flow unit (55) is coaxially installed inside the middle oil pipe (53), and the cutting flow unit (55) is fixedly connected to the inner wall of the middle oil pipe (53); The oil outlet pipe (56) is fixedly connected to the end of the middle oil pipe (53) away from the second connecting unit (52), and the oil outlet pipe (56) is sealed and connected to the electromagnetic speed regulating valve (6) through a flange. A mounting ring plate (531) is fixedly provided on the outer wall of the middle oil pipe (53) near the end thereof, and mounting through holes (532) are uniformly opened on the mounting ring plate (531) along its circumference. A pulse through hole (533) is uniformly opened along the circumference of the outer wall of the middle oil pipe (53) and located between the two mounting ring plates (531); an overflow hole (534) is uniformly opened along the circumference of the outer wall of the middle oil pipe (53) on one side of the pulse through hole (533) and located between the two mounting ring plates (531); the inner diameter of the overflow hole (534) gradually decreases from the outer side to the inner side of the middle oil pipe (53); A flow-blocking ring (535) is fixedly installed at a position near the plug-in pipe (521) inside the middle oil pipe (53), and an annular flow-guiding ring (536) is fixedly provided on the side wall of the flow-blocking ring (535) near the plug-in pipe (521). The cross section of the annular flow-guiding ring (536) is trapezoidal and triangular. The pulsation absorption unit (54) includes a positioning ring (541), which is fixedly provided on the outer wall of the middle oil pipe (53) and close to the mounting ring plate (531). Arc-shaped mounting blocks (542) are evenly installed on the outer side of the positioning ring (541) along its circumference. A sealing shell (543) is fixedly connected between the arc-shaped mounting blocks (542). The sealing shell (543) and the outer wall of the middle oil pipe (53) are sealed and connected. An arc-shaped damper is fixedly installed in the middle of the inner wall of the sealing shell (543). (544), the arc damper (544) is fixedly mounted on the outer wall of the middle oil pipe (53) away from the side wall of the sealing shell (543), and a guide hole (545) is uniformly opened in the middle of the arc damper (544) along its arc direction. An elastic capsule (546) is fixedly arranged on the inner wall of the sealing shell (543) and close to the pulse through hole (533). Support springs (547) for making the elastic capsule (546) abut against the end of the pulse through hole (533) are uniformly arranged inside the elastic capsule (546); The cutting flow unit (55) includes a concentric disk (551), a concentric disk (551) is fixedly installed at a position near the electromagnetic speed regulating valve (6) inside the middle oil pipe (53), a flow groove (552) is evenly opened on the concentric disk (551) along its circumference, a T-shaped rod (553) is slidably installed in the middle of the concentric disk (551), a limit plate (555) is fixedly arranged in the middle of the T-shaped rod (553), an oscillation spring (556) is sleeved on the T-shaped rod (553) between the limit plate (555) and the concentric disk (551), a diffuser (554) is fixedly installed at the end of the T-shaped rod (553) close to the concentric disk (551), and a cutting flow blade (557) is evenly installed at the end of the T-shaped rod (553) away from the concentric disk (551) along its circumference.

2. A high-pressure, non-pulsating hydraulic pump based on an electromagnetic speed regulating valve according to claim 1, characterized in that: The first connecting unit (51) comprises a first connecting pipe (511), the first connecting pipe (511) being fixedly mounted on a side wall of the directional valve (3) away from the oil inlet pipe (4), a threaded section (512) being provided on the outer side of the first connecting pipe (511) and at an end away from the directional valve (3), an inner connecting pipe (513) being fixedly arranged coaxially in the middle of the inner side of the first connecting pipe (511), an annular groove being provided inside the end of the inner connecting pipe (513) away from the directional valve (3), and a sealing pipe (515) being slidably mounted inside the annular groove via a compression spring (514).

3. A high-pressure, non-pulsating hydraulic pump based on an electromagnetic speed regulating valve according to claim 2, characterized in that: The second connecting unit (52) includes a plug-in tube (521), a plug-in tube (521) being fixedly mounted on the side wall of the end of the middle oil pipe (53) close to the directional valve (3), and an internally threaded sleeve (522) being rotatably connected to the outer side of the end of the middle oil pipe (53) close to the directional valve (3), and a concave groove (523) being uniformly formed on the outer side wall of the internally threaded sleeve (522) along its circumference.

4. A high-pressure, non-pulsating hydraulic pump based on an electromagnetic speed regulating valve according to claim 3, characterized in that: A sealing ring (5211) is fixedly provided at the end of the plug-in pipe (521) close to the inner connecting pipe (513), and the outer diameter of the plug-in pipe (521) is equal to the inner diameter of the first connecting pipe (511).

5. The high-pressure, non-pulsating hydraulic pump based on an electromagnetic speed regulating valve according to claim 1, characterized in that: An alignment through hole (5421) is provided on the arc-shaped mounting block (542) at a position corresponding to the mounting through hole (532).

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