An electro-hydraulic servo flow valve for precise compression of clean energy

Abstract

The present invention provides an electro-hydraulic servo flow valve for precise compression of clean energy, the 2D electro-hydraulic servo flow valve comprising a valve body, a valve core installed in the valve body, and a valve sleeve arranged on the outside of the valve core, characterized in that one end of the valve body is connected to a rotary servo motor via a ball screw rigid coupling, the ball screw rigid coupling comprises a rotor connector connected to the rotor of the rotary servo motor, the other end of the rotor connector is connected to the valve core via a valve core buffer assembly, the valve core buffer assembly comprises a connecting sleeve connected to the rotor connector and a connecting shaft connected to the valve core, a rotary guide groove is provided on the connecting sleeve, and the connecting shaft is threadedly connected to the rotary guide groove. The present invention can meet the axial movement of the valve core while ensuring that the rotor of the rotary servo motor will not be interfered with by the axial movement of the valve core, and the process of the present invention is simple, the production cost is low, and the adaptability is strong.

Description

Technical Field

[0001] The present invention relates to the field of electro-hydraulic servo control systems, and in particular to an electro-hydraulic servo flow valve for precise compression of clean energy. Background Art

[0002] Existing clean energy precision compression systems typically utilize electro-hydraulic servo control systems as the power system to compress clean energy. The electro-hydraulic servo valve is a core component of this system, serving as a bridge between microelectronic control and high-power hydraulic drive. Its performance largely determines the characteristics of the entire electro-hydraulic servo control system. Currently, these systems' electro-hydraulic servo flow valves often utilize nozzle-flapper servo valves or jet tube servo valves to precisely control the cylinders for clean energy compression. However, these valves are difficult to manufacture, expensive, and have poor pollution resistance. Using an electro-hydraulic servo valve to control the cylinder offers numerous advantages, including lower cost, improved pollution resistance, compact size, high flow rate, and a high power-to-weight ratio.

[0003] However, in the existing two-dimensional electro-hydraulic servo flow valve, a customized two-dimensional motor is generally used to directly connect with the valve core. Its biggest feature is that the motor rotor shaft is directly fixed to the valve core through a thread, without bearing support. The motor rotor can move axially with the valve core while rotating, thereby ensuring that the valve core will not interfere with the rotor of the two-dimensional motor when moving axially. However, the two-dimensional motor needs to be specially designed, and the process is complex, the production cost is high, and the adaptability is not strong.

[0004] In addition, the Chinese invention patent application number: 2016100481195 discloses a half-bridge 2D electro-hydraulic proportional reversing valve with an elastic compression-torsion coupling of a transmission shaft. This invention patent uses an elastic compression-torsion coupling with a transmission shaft as a component for transmitting torque between the rotary proportional electromagnet and the valve core. One end of the transmission shaft is clearance-fitted with the valve core, and the other end is interference-fitted with the rotor of the rotary proportional electromagnet. During the axial movement of the valve core, the axial friction between the transmission shaft and the valve core is large due to the clearance fit between the transmission shaft and the valve core. The movement friction will be transmitted to the rotor, causing damage to the rotary proportional electromagnet. In addition, since the rotor of the rotary proportional electromagnet cannot move axially, it cannot withstand excessive axial force on the valve core. Therefore, the axial movement of the valve core will interfere with the rotor. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention aims to provide an electro-hydraulic servo flow valve for precise clean energy compression. While ensuring the axial movement of the valve core, the present invention also ensures that the rotor of the rotary servo motor is not interfered with by the axial movement of the valve core. Furthermore, the present invention features a simple process, low production cost, and strong adaptability.

[0006] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0007] An electro-hydraulic servo flow valve for precise compression of clean energy, the 2D electro-hydraulic servo flow valve includes a valve body, a valve core installed in the valve body and a valve sleeve arranged on the outside of the valve core, and is characterized in that: one end of the valve body is connected to the rotary servo motor through a ball screw type rigid coupling, the ball screw type rigid coupling includes a rotor connector connected to the rotor of the rotary servo motor, the other end of the rotor connector is connected to the valve core through a valve core buffer assembly, the valve core buffer assembly includes a connecting sleeve connected to the rotor connector and a connecting shaft connected to the valve core, a rotation guide groove is provided on the connecting sleeve, the connecting shaft is threadedly connected to the rotation guide groove, and the connecting shaft can rotate relative to the connecting sleeve and move axially at the same time.

[0008] Furthermore: a threaded connection section is provided on the connecting shaft, and a thread is provided on the inner wall of the rotation guide groove. The connecting shaft is threadedly connected to the inner wall of the rotation guide groove through the threaded connection section, and the height dimension of the threaded connection section is smaller than the groove depth dimension of the rotation guide groove.

[0009] Furthermore: the difference between the groove depth of the rotation guide groove and the height of the connecting section is greater than the designed travel distance of the axial movement of the valve core and the connecting shaft.

[0010] Furthermore: the rotary servo motor includes a motor housing, the rigid coupling with a ball screw includes a coupling housing, and the motor housing is fixedly connected to the coupling housing.

[0011] Furthermore: the rotor connecting member is fixedly connected to the connecting sleeve through the first connecting member.

[0012] Furthermore: the rotor connecting member is fixedly connected to the rotor via a second connecting member.

[0013] Furthermore: the rotor connector, connecting sleeve, connecting shaft, rotor and valve core are coaxially arranged.

[0014] Furthermore, when the valve core pushes the connecting shaft to move axially, the connecting shaft and the connecting sleeve generate relative torsion to drive the valve core to rotate. The mathematical model is as follows:

[0015]

[0016] in:

[0017] F a -Axial thrust generated by the connecting shaft;

[0018] η-positive efficiency of the feed connection axis;

[0019] T - driving torque applied by the rotor;

[0020] β h - Lead of the feed connecting axis.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] In the present invention, when the rotary servo motor is energized, the rotational movement of the rotor causes the valve core to rotate through the ball screw coupling. When the valve core rotates following the ball screw coupling, the pressure in the sensitive chamber on the left side of the valve core changes. The valve core pulls the connecting shaft to the left or presses the connecting shaft to the right under the action of the unbalanced liquid pressure in the left and right chambers. The connecting shaft moves axially under the action of the axial force of the valve core, that is, the connecting shaft moves axially while driving the valve core to rotate until the valve core returns to the equilibrium position. When the valve core and the connecting shaft move axially with a large displacement, the initial distance between the right end face of the threaded connection section and the bottom face of the rotating guide groove is greater than the designed stroke distance of the valve core, thereby ensuring that the rotor of the rotary servo motor will not be interfered with by the axial movement of the valve core. Furthermore, the use of a rigid coupling with a ball screw has the advantages of high precision, high strength, long life, wear resistance and smooth operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the internal structure of the present invention;

[0024] Figure 2 yes Figure 1 A magnified schematic diagram of part A in FIG;

[0025] Figure 3 It is a structural schematic diagram of the present invention in which a rigid coupling with a ball screw is connected to a valve core and a rotary servo motor respectively.

[0026] Figure markings: 2-2D electro-hydraulic servo flow valve; 21-valve body; 22-valve core; 23-valve sleeve; 3-rotary servo motor; 31-rotor; 32-motor housing; 4-rigid coupling with ball screw; 41-connecting shaft; 42-connecting sleeve; 43-first connecting piece; 44-rotor connecting piece; 45-rotation guide groove; 46-second connecting piece; 47-threaded connection section; 5-coupling housing. DETAILED DESCRIPTION

[0027] To help those skilled in the art better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the present invention. To better illustrate the present embodiments, certain components in the drawings may be omitted, enlarged, or reduced, and do not represent the dimensions of actual products. It is understandable that certain well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present invention.

[0028] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0029] like Figures 1 to 3 As shown, an electro-hydraulic servo flow valve for precise compression of clean energy, the 2D electro-hydraulic servo flow valve 2 includes a valve body 21, a valve core 22 installed in the valve body 21 and a valve sleeve 23 arranged on the outside of the valve core 22, one end of the valve body 21 is connected to the rotary servo motor 3 through a ball screw type rigid coupling 4, the ball screw type rigid coupling 4 includes a rotor connector 44 connected to the rotor 31 of the rotary servo motor 3, in this embodiment, the rotor connector 44 adopts a flange, and the other end of the rotor connector 44 is connected to the valve core 22 through a valve core buffer assembly, the valve core buffer assembly includes a connecting sleeve 42 connected to the rotor connector 44 and a connecting shaft 41 connected to the valve core, a rotation guide groove 45 is opened on the connecting sleeve 42, and the connecting shaft 41 is threadedly connected to the rotation guide groove 45, and the connecting shaft 41 can rotate relative to the connecting sleeve 42 and move axially at the same time.

[0030] The connecting shaft 41 is provided with a threaded connection section 47 , and the inner wall of the rotation guide groove 45 is provided with threads. The connecting shaft 41 is threadedly connected to the inner wall of the rotation guide groove 45 through the threaded connection section 47 . The height dimension of the threaded connection section 47 is smaller than the groove depth dimension of the rotation guide groove 45 .

[0031] The difference between the groove depth of the rotation guide groove 45 and the height of the connecting section 47 is greater than the designed stroke distance of the axial movement of the valve core 22 and the connecting shaft 41 .

[0032] The rotary servo motor 3 includes a motor housing 32 , and the ball screw type rigid coupling 4 includes a coupling housing 5 . The motor housing 32 is fixedly connected to the coupling housing 5 .

[0033] The rotor connector 44 is fixedly connected to the connecting sleeve 42 via the first connector 43. In this embodiment, the rotor connector 44 is fixedly connected to the connecting sleeve 42 via screws; however, in actual engineering applications, depending on the circumstances, the first connector 43 may also be a bolt, or the rotor connector 44 may be connected to the connecting sleeve 42 by an interference fit.

[0034] The connecting sleeve 42 includes a sleeve connecting section and a connecting plate. The first connecting members 43 are provided in multiple groups. The rotor connecting member 44 is connected to the connecting plate via multiple groups of first connecting members 43. The sleeve connecting section is threadedly connected to the threaded connecting section 47.

[0035] The rotor connector 44 is fixedly connected to the rotor 31 via a second connector 46. In this embodiment, the rotor connector 44 is fixedly connected to the rotor 31 via a flat key; however, in actual engineering applications, depending on the circumstances, the second connector 46 can also be connected by clamping the rotor connector 44 to the rotor 31 with screws.

[0036] The rotor connector 44 , the connecting sleeve 42 , the connecting shaft 41 , the rotor 31 and the valve core 12 are coaxially arranged.

[0037] When the valve core 22 pushes the connecting shaft 41 to move axially, the connecting shaft 41 and the connecting sleeve 42 generate relative torsion to drive the valve core 22 to rotate. The mathematical model is as follows:

[0038]

[0039] in:

[0040] F a -Axial thrust generated by the connecting shaft;

[0041] η-positive efficiency of the feed connection axis;

[0042] T - driving torque applied by the rotor;

[0043] β h - Lead of the feed connecting axis.

[0044] The specific working principle of the electro-hydraulic servo flow valve for precise compression of clean energy is as follows:

[0045] like Figure 3 As shown, the system pressure port P, working oil ports A and B, and return oil pressure port T. When there is no control signal from the rotary servo motor 3, the valve core 22 is at zero position, the intersection area between the high-pressure hole 221 and the sensitive channel 223, and the intersection area between the low-pressure hole 222 and the sensitive channel 223 are the same, the pressure at the left end of the valve core 22 is half of the system pressure P, while the pressure at the right end is constant P, but its effective area is only half of the area of the left end of the valve core 22, so the valve core 22 is in balance.

[0046] When the rotary servo motor 3 receives the control signal, on the one hand, the right end of the rotor connector 44 is rigidly connected to the rotor 32 through a flat key, and the left end is rigidly connected to the connecting sleeve 42 through the first connecting member 43. On the other hand, since the driving torque of the rotary servo motor 2 is small, the axial steady-state fluid force exerted on the valve core 22 fixedly connected to the connecting shaft 41 is large. Therefore, the rotational motion of the rotor 32 is transmitted to the valve core 22 through the rotor connector 44, the connecting sleeve 42 and the connecting shaft 41, causing the valve core 22 to rotate.

[0047] The movement of the valve core 22 has the following two situations:

[0048] 1. When the valve core 22 rotates clockwise (from right to left) following the connecting shaft 41, the intersection area between the high-pressure hole 221 on the step of the valve core 22 and the sensitive channel 223 decreases, while the intersection area between the low-pressure hole 222 and the sensitive channel 223 increases. The pressure in the left sensitive chamber decreases, while the pressure in the right high-pressure chamber remains constant. Under the action of the unbalanced hydraulic pressure between the left and right chambers, the valve core 22 moves axially to the left, simultaneously pulling the connecting shaft 41 to move leftward. As the connecting shaft 41 moves axially to the left, the connecting shaft 41 and the connecting sleeve 42 generate counterclockwise (from right to left) rotational motion, and the connecting shaft 41 simultaneously drives the valve core 22 to rotate counterclockwise (from right to left). At this time, the intersection area between the high-pressure hole 221 on the step of the valve core 22 and the sensitive channel 223 increases, and the intersection area between the low-pressure hole 222 and the sensitive channel 223 decreases, and the pressure in the left sensitive chamber increases until the pressure in the left sensitive chamber and the force in the right high-pressure chamber reach equilibrium, and the valve core 22 returns to the equilibrium position.

[0049] 2. When the valve core 22 rotates counterclockwise (from right to left) following the connecting shaft 41, the intersection area between the high-pressure hole 221 on the step of the valve core 22 and the sensitive channel 223 increases, and the intersection area between the low-pressure hole 222 and the sensitive channel 223 decreases. The pressure in the left sensitive chamber increases, and the pressure in the right high-pressure chamber remains constant. Under the action of the unbalanced liquid pressure in the left and right chambers, the valve core 22 moves axially to the right, while pushing the connecting shaft 41 to move to the right. While the connecting shaft 41 moves axially to the right, the connecting shaft 41 and the connecting sleeve 42 produce a clockwise (from right to left) rotational motion, and the connecting shaft 41 simultaneously drives the valve core 22 to rotate clockwise (from right to left). At this time, the intersection area between the high-pressure hole 221 on the step of the valve core 22 and the sensitive channel 223 decreases, and the intersection area between the low-pressure hole 222 and the sensitive channel 223 increases. The pressure in the left sensitive chamber decreases until the pressure in the left sensitive chamber and the force in the right high-pressure chamber reach equilibrium, and the valve core 22 returns to the equilibrium position.

[0050] Therefore, when the connecting shaft 41 rotates counterclockwise (viewed from right to left) and moves axially to the left, the distance between the right end face of the threaded connection section 47 of the connecting shaft 41 and the bottom surface of the rotation guide groove 45 of the connecting sleeve 42 gradually increases; when the connecting shaft 41 rotates clockwise (viewed from right to left) and moves axially to the right, the distance between the right end face of the threaded connection section 47 of the connecting shaft 41 and the bottom surface of the rotation guide groove 45 of the connecting sleeve 42 gradually decreases; the initial distance between the right end face of the threaded connection section 47 and the bottom surface of the rotation guide groove 45 is greater than the designed stroke distance of the valve core 22, so the valve core 22 will not cause axial interference with the rotor 31 when it moves axially.

[0051] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the electro-hydraulic servo flow valve of the present invention for precise compression of clean energy, and can produce the positive effects described in the present invention.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An electro-hydraulic servo flow valve for precise compression of clean energy, a 2D electro-hydraulic servo flow valve (2) comprising a valve body (21), a valve core (22) installed in the valve body (21), and a valve sleeve (23) arranged outside the valve core (22), characterized in that: One end of the valve body (21) is connected to the rotary servo motor (3) via a ball screw type rigid coupling (4), the ball screw type rigid coupling (4) includes a rotor connector (44) connected to the rotor (31) of the rotary servo motor (3), the other end of the rotor connector (44) is connected to the valve core (22) via a valve core buffer assembly, the valve core buffer assembly includes a connecting sleeve (42) connected to the rotor connector (44) and a connecting shaft (41) connected to the valve core, a rotary guide groove (45) is provided on the connecting sleeve (42), the connecting shaft (41) is threadedly connected to the rotary guide groove (45), and the connecting shaft (41) can rotate relative to the connecting sleeve (42) and simultaneously move axially; The movement of the valve core (22) has the following two situations: When the valve core (22) rotates clockwise following the connecting shaft (41), the intersection area between the high-pressure hole (221) on the step of the valve core (22) and the sensitive channel (223) decreases, and the intersection area between the low-pressure hole (222) and the sensitive channel (223) increases, the pressure of the left sensitive chamber decreases, and the pressure of the right high-pressure chamber remains constant. Under the action of the unbalanced liquid pressure between the left and right chambers, the valve core (22) moves axially to the left, and at the same time pulls the connecting shaft (41) to move to the left together; while the connecting shaft (41) moves axially to the left , the connecting shaft (41) and the connecting sleeve (42) generate counterclockwise rotational motion, and the connecting shaft (41) simultaneously drives the valve core (22) to rotate counterclockwise; at this time, the intersection area between the high-pressure hole (221) and the sensitive channel (223) on the step of the valve core (22) increases, and the intersection area between the low-pressure hole (222) and the sensitive channel (223) decreases, and the pressure of the left sensitive chamber increases until the pressure of the left sensitive chamber and the pressure of the right high-pressure chamber reach equilibrium, and the valve core (22) returns to the equilibrium position; When the valve core (22) rotates counterclockwise along with the connecting shaft (41), the intersection area between the high-pressure hole (221) and the sensitive channel (223) on the step of the valve core (22) increases, and the intersection area between the low-pressure hole (222) and the sensitive channel (223) decreases, the pressure of the left sensitive chamber increases, and the pressure of the right high-pressure chamber remains constant. The valve core (22) moves axially to the right under the action of the unbalanced liquid pressure of the left and right chambers, and at the same time pushes the connecting shaft (41) to move to the right together. When the connecting shaft (41) moves axially to the right, At the same time, the connecting shaft (41) and the connecting sleeve (42) generate clockwise rotational motion, and the connecting shaft (41) drives the valve core (22) to rotate clockwise at the same time; at this time, the intersection area between the high-pressure hole (221) and the sensitive channel (223) on the step of the valve core (22) decreases, and the intersection area between the low-pressure hole (222) and the sensitive channel (223) increases, and the pressure of the left sensitive chamber decreases until the pressure of the left sensitive chamber and the pressure of the right high-pressure chamber reach equilibrium, and the valve core (22) returns to the equilibrium position; The electro-hydraulic servo flow valve for precise compression of clean energy is characterized in that: a threaded connection section (47) is provided on the connecting shaft (41), the inner wall of the rotary guide groove (45) is provided with a thread, the connecting shaft (41) is threadedly connected to the inner wall of the rotary guide groove (45) through the threaded connection section (47), and the height dimension of the threaded connection section (47) is smaller than the groove depth dimension of the rotary guide groove (45); The electro-hydraulic servo flow valve for precise compression of clean energy is characterized in that the difference between the groove depth of the rotary guide groove (45) and the height of the threaded connection section (47) is greater than the designed stroke distance of the axial movement of the valve core (22) and the connecting shaft (41).

2. The electro-hydraulic servo flow valve for precise compression of clean energy according to claim 1, characterized in that: The rotary servo motor (3) includes a motor housing (32), the ball screw type rigid coupling (4) includes a coupling housing (5), and the motor housing (32) is fixedly connected to the coupling housing (5).

3. The electro-hydraulic servo flow valve for precise compression of clean energy according to claim 1, characterized in that: The rotor connecting member (44) is fixedly connected to the connecting sleeve (42) via the first connecting member (43).

4. The electro-hydraulic servo flow valve for precise compression of clean energy according to claim 1, characterized in that: The rotor connecting member (44) is fixedly connected to the rotor (31) via a second connecting member (46).

5. The electro-hydraulic servo flow valve for precise compression of clean energy according to claim 1, characterized in that: The rotor connector (44), the connecting sleeve (42), the connecting shaft (41), the rotor (31), and the valve core (22) are coaxially arranged.

6. The electro-hydraulic servo flow valve for precise compression of clean energy according to claim 1, characterized in that: When the valve core (22) pushes the connecting shaft (41) to move axially, the connecting shaft (41) and the connecting sleeve (42) generate relative torsion to drive the valve core (22) to rotate. The mathematical model is as follows: in: -Axial thrust generated by the connecting shaft; - positive efficiency of the feed connection axis; - the driving torque exerted by the rotor; - Lead of the feed connecting axis.

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