Electro-hydraulic integrated control valve

Abstract

The invention discloses an electro-hydraulic integrated control valve, and relates to the technical field of electro-hydraulic control valves. The electro-hydraulic integrated control valve comprises a shell, a power-level main valve is fixedly connected to the interior of the shell, a pilot-level valve is fixedly connected to the top of the power-level main valve, a power interface is fixedly connected to the surface of the pilot-level valve, a fixing rod is fixedly connected to the interior of the pilot-level valve, and the power interface is fixedly connected to the surface of the fixing rod. The surface of the fixing rod is fixedly connected with a square frame magnet, the shell is fixedly connected with a sealing control mechanism, a first pressure oil port and a second working oil port are formed in the power level main valve, and the power level main valve is further provided with a second pressure oil port and a first working oil port. According to the electro-hydraulic integrated control valve, movement of the scraping piece is achieved through the pressure difference, so that two-way quick response is achieved, the structure is compact and simple, the driving cost of a driving pump is reduced, impurities on the surface of the valve element are automatically scraped away, and the situation that the control valve cannot work normally due to the fact that the valve element is jammed is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of electro-hydraulic control valves, and specifically to an electro-hydraulic integrated control valve. Background Art

[0002] An electro-hydraulic integrated control valve is a control element that converts an electrical signal into a hydraulic signal, and its working principle is based on the principles of electromagnetism and fluid mechanics. When the electro-hydraulic integrated control valve receives an analog electrical signal, the electromagnet generates an electromagnetic force to drive the spool to move, thereby changing the valve opening and realizing the regulation of the flow rate and pressure in the hydraulic system. This regulation method has the characteristics of high precision and fast response, making the electro-hydraulic servo valve widely used in industrial automation, aerospace, shipbuilding and other fields; Referring to the invention patent with the Chinese publication number "CN112709721B", a main directional control valve, a pilot directional control valve, a pilot relief valve and a two-way cartridge valve. The two working oil ports of the pilot directional control valve are respectively connected to the left control oil port and the right control oil port at both ends of the main directional control valve; the control port of the two-way cartridge valve is simultaneously connected to the oil inlet of the pilot directional control valve and the oil inlet of the pilot relief valve; the oil inlet of the main directional control valve is connected to the oil inlet of the two-way cartridge valve, and the oil return port of the main directional control valve is simultaneously connected to the oil outlet of the two-way cartridge valve, the oil outlet of the pilot relief valve and the oil return port of the pilot directional control valve. This design realizes the control of commutation without an external control oil source, and the electro-hydraulic integrated control valve has a simple structure, a stable commutation process, small pressure loss flowing through the integrated control valve, and is more energy-saving and environmentally friendly.

[0003] The existing electro-hydraulic integrated control valve has no special protection structure on the outside. When the environmental temperature drops suddenly, the temperature inside the valve body will also change suddenly, resulting in the thermal expansion and contraction of the liquid inside the valve body, affecting its normal operation. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an electro-hydraulic integrated control valve to solve the problems raised in the above background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: an electro-hydraulic integrated control valve, including a housing, a power stage main valve is fixedly connected inside the housing, a pilot stage valve is fixedly connected to the top of the power stage main valve, a power supply interface is fixedly connected to the surface of the pilot stage valve, a fixed rod is fixedly connected inside the pilot stage valve, a square magnet is fixedly connected to the surface of the fixed rod, a sealing control mechanism is fixedly connected inside the housing, a first pressure oil port and a second working oil port are opened inside the power stage main valve, and a second pressure oil port and a first working oil port are also opened in the power stage main valve; The sealing control mechanism includes: An armature, which is fixedly connected inside a square magnet; A feedback rod, which is fixedly connected to the bottom of the armature; A valve core, which is fixedly connected to the bottom of the feedback rod, and a forward spiral groove and a reverse spiral groove are formed on the surface of the valve core.

[0006] Preferably, the pitch of the forward spiral groove is 2 mm, the pitch of the reverse spiral groove is 3 mm, the forward spiral groove and the reverse spiral groove are staggered along the axial direction of the valve core, and respectively correspond to the second working oil port and the first pressure oil port oil circuit intervals in the power stage main valve. The oil film thickness is 5 - 10 μm to provide a heat conduction path, and the heat generated by friction is carried away by the oil fluid to avoid material softening caused by local overheating.

[0007] Preferably, the depth of the forward spiral groove and the reverse spiral groove is 0.3 mm, and the width of the groove is 1.5 mm. An oil film will be formed on the surface of the valve core. The oil film separates the contact surface through the hydrodynamic pressure effect, and the friction coefficient is reduced from the traditional 0.15 in the contact type to 0.01 - 0.03, and the wear rate is greatly reduced.

[0008] Preferably, a valve sleeve is fixedly connected to the surface of the valve core, and a first return spring is fixedly connected to the surface of the valve sleeve near the second pressure oil port and the first working oil port. A scraping blade is fixedly connected to the surface of the first return spring. The scraping blade is made of PEEK composite material, which has a low friction coefficient, significantly reduces the movement resistance of the valve core, improves the response speed of the control valve, has high wear resistance, can be immersed in hydraulic oil and acidic media for a long time, has wide temperature range stability, and can eliminate static electricity accumulation.

[0009] Preferably, a wedge-shaped opening is formed on the surface of the scraping blade, and a telescopic limit rod is fixedly connected to the surface of the scraping blade, and the telescopic limit rod is arranged on the surface of the valve sleeve near the first pressure oil port and the second working oil port.

[0010] Preferably, the seal control mechanism further includes a limit cylinder body, which is fixedly connected to the surface of the square magnet. The number of the limit cylinder bodies is two, and the two limit cylinder bodies are symmetrically distributed about the axis of the square magnet.

[0011] Preferably, a second return spring is fixedly connected inside the limit cylinder body. A coil is slidably connected inside the square magnet. The number of the coils is two, and the armature is arranged between the two coils.

[0012] Preferably, the housing is a vacuum sandwich structure, and the sandwich is filled with nano-aerogel, which is an ultra-light solid material with a nano-scale porous structure. It significantly reduces the influence of the external temperature on the inside of the valve body, reduces thermal stress deformation, improves the movement accuracy of the spool, reduces the overall weight of the servo valve, and is applicable to high-temperature industrial environments. It is stable in the hydraulic oil environment for a long time, avoiding the decline of the heat insulation performance caused by material corrosion. Although the unit price of nano-aerogel is relatively high, its comprehensive performance is excellent, which can significantly reduce the system operation and maintenance costs.

[0013] The present invention provides an electro-hydraulic integrated control valve, which has the following beneficial effects: 1. For this electro-hydraulic integrated control valve, by setting a forward spiral groove, when the oil circuit of the first working oil port is opened, a smaller pitch can enable the oil to quickly form high pressure in the spiral groove, generating a large axial driving force to push the spool to move quickly, greatly shortening the response time, forming a forward high-pressure oil film to bear the load. When the oil circuit of the second pressure oil port is opened, by setting a reverse spiral groove, a larger pitch can make the oil flow more smoothly, reducing the flow resistance, enabling the spool to quickly respond to the command and move in the corresponding direction, and similarly shortening the response time significantly. And by setting threads to form an oil film, the stable oil film provides good lubrication conditions for the spool, reducing the friction coefficient. At the same time, it further reduces the impact and vibration suffered by the spool during movement, ensuring the stable operation of the control valve. Moreover, the threaded groove opened generates a turbulence effect, flushing the sediment on the surface of the spool body and reducing the attachment of impurities.

[0014] 2. For this electro-hydraulic integrated control valve, by setting the housing as a vacuum sandwich structure and setting nano-aerogel in the sandwich, it avoids the thermal expansion and contraction of the control valve liquid caused by sudden temperature drop, affecting the normal operation, thereby reducing the thermal stress deformation of the control valve, and thus ensuring the stable operation of the control valve.

[0015] 3. For this electro-hydraulic integrated control valve, by setting a wiper, the movement of the wiper is realized through the pressure difference, thereby achieving two-way fast response. The structure is compact and simple, reducing the cost of using a driving pump, and automatically scraping the impurities on the surface of the spool, avoiding the situation that the spool jams and affects the normal operation of the control valve.

[0016] 4. For this electro-hydraulic integrated control valve, by modularizing the pilot stage valve and the power stage main valve, they can be disassembled and replaced separately without disassembling the entire system, which is convenient for modular maintenance, and thus convenient to ensure the normal operation of the control valve. Description of the Drawings

[0017] Figure 1 It is the front view three-dimensional structure schematic diagram of the present invention; Figure 2 It is the sectional view schematic diagram of the housing of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic view at position A in the present invention; Figure 4 Schematic cross-sectional view of the main valve of the first power stage of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic view at position B in the present invention; Figure 6 Schematic cross-sectional view of the main valve of the second power stage of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic view at position C in the present invention; Figure 8 Schematic cross-sectional view of the pilot stage valve of the present invention.

[0018] In the figure: 1, housing; 2, power supply interface; 3, main valve of the power stage; 4, pilot stage valve; 5, square magnet; 6, fixed rod; 7, seal control mechanism; 71, armature; 72, feedback rod; 73, valve core; 74, valve sleeve; 75, first return spring; 76, scraping piece; 77, telescopic limiting rod; 78, limiting column; 79, second return spring; 710, forward spiral groove; 711, reverse spiral groove; 712, coil; 8, first pressure oil port; 9, second pressure oil port; 10, first working oil port; 11, second working oil port. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] Embodiment 1: Please refer to Figures 1-5 , the present invention provides a technical solution: an electro-hydraulic integrated control valve, including a housing 1, a main valve 3 of the power stage fixedly connected inside the housing 1, a pilot stage valve 4 fixedly connected to the top of the main valve 3 of the power stage, a power supply interface 2 fixedly connected to the surface of the pilot stage valve 4, a fixed rod 6 fixedly connected inside the pilot stage valve 4, a square magnet 5 fixedly connected to the surface of the fixed rod 6, a seal control mechanism 7 fixedly connected inside the housing 1, a first pressure oil port 8 and a second working oil port 11 are opened inside the main valve 3 of the power stage, and a second pressure oil port 9 and a first working oil port 10 are also opened in the main valve 3 of the power stage; The seal control mechanism 7 includes: The armature 71 is fixedly connected inside the square magnet 5. The feedback rod 72 is fixedly connected to the bottom of the armature 71. The spool 73 is fixedly connected to the bottom of the feedback rod 72, and a forward spiral groove 710 and a reverse spiral groove 711 are formed on the surface of the spool 73.

[0022] The pitch of the forward spiral groove 710 is 2 mm, and the pitch of the reverse spiral groove 711 is 3 mm. The forward spiral groove 710 and the reverse spiral groove 711 are staggered along the axial direction of the spool 73 and respectively correspond to the oil passage intervals of the second working oil port 11 and the first pressure oil port 8 in the power stage main valve 3.

[0023] The groove depth of the forward spiral groove 710 and the reverse spiral groove 711 is 0.3 mm, and the groove width is 1.5 mm.

[0024] During use, first install the power stage main valve 3 and the pilot stage valve 4 inside the housing 1 to avoid thermal expansion and contraction of the control valve liquid caused by sudden temperature drop, which affects normal operation, thereby reducing the thermal stress deformation of the control valve and ensuring the stable operation of the control valve.

[0025] By setting the forward spiral groove 710, when the oil passage of the first working oil port 10 is opened, the smaller pitch can enable the oil to quickly form a high pressure in the spiral groove, generating a large axial driving force to push the spool to move quickly, significantly shortening the response time, forming a forward high-pressure oil film load. When the oil passage of the second pressure oil port 9 is opened, by setting the reverse spiral groove 711, the larger pitch can make the oil flow more smoothly, reducing the flow resistance, enabling the spool to quickly respond to the command and move in the corresponding direction, also significantly shortening the response time. And by setting the threaded grooves to form an oil film, the stable oil film provides good lubrication conditions for the spool, reducing the friction coefficient. At the same time, it further reduces the impact and vibration on the spool during movement, ensuring the stable operation of the control valve, and the threaded grooves generate a turbulence effect, scouring the deposits on the surface of the spool 73 body and reducing the attachment of impurities.

[0026] By modularizing the pilot stage valve 4 and the power stage main valve 3, they can be disassembled and replaced separately without disassembling the entire system, which is convenient for modular maintenance and thus convenient for ensuring the normal operation of the control valve.

[0027] Embodiment 2: Please refer to Figures 1-8 , on the basis of Embodiment 1, the present invention provides a technical solution: A valve sleeve 74 is fixedly connected to the surface of the spool 73, and a first return spring 75 is fixedly connected to the surface of the valve sleeve 74 near the positions of the second pressure oil port 9 and the first working oil port 10, and a scraper 76 is fixedly connected to the surface of the first return spring 75.

[0028] The surface of the scraping blade 76 is provided with a wedge-shaped opening. The surface of the scraping blade 76 is fixedly connected with a telescopic limiting rod 77, and the telescopic limiting rod 77 is arranged on the surface of the valve sleeve 74 near the first pressure oil port 8 and the second working oil port 11.

[0029] The seal control mechanism 7 further includes a limiting column body 78. The limiting column body 78 is fixedly connected to the surface of the square magnet 5. The number of the limiting column bodies 78 is two, and the two limiting column bodies 78 are symmetrically distributed about the axis of the square magnet 5.

[0030] A second return spring 79 is fixedly connected inside the limiting column body 78. A coil 712 is slidably connected inside the square magnet 5. The number of the coils 712 is two, and the armature 71 is arranged between the two coils 712.

[0031] The housing 1 is a vacuum sandwich structure, and the sandwich is filled with nano-aerogel.

[0032] During use, after installation, combined with Figure 4 When the valve core 73 moves to the right, the hydraulic oil flows out from the second working oil port 11 along the internally circulating groove and flows out from the first working oil port 10. When the hydraulic oil enters from the second working oil port 11, it will drive the scraping blade 76 to move in the direction of the valve sleeve 74 closest to the first working oil port 10 at this time, so that the scraping blade 76 scrapes off the impurities on the surface of the valve core 73. While the scraping blade 76 moves, the telescopic limiting rod 77 extends, enhancing the stability during the movement of the scraping blade 76. Finally, the side of the scraping blade 76 close to the valve sleeve 74 is formed, so that the hydraulic oil flows out from the first working oil port 10. During this process, an oil film will be formed on the surface of the valve core 73. The oil film separates the contact surface through the hydrodynamic effect, reduces the friction coefficient, and can absorb the hydraulic shock energy to protect the valve core from mechanical damage. At the same time, the heat generated by friction is taken away by the oil fluid to avoid material softening caused by local overheating.

[0033] When the valve core 73 is restored to the left, the scraping blade 76 will clean the impurities on the surface of the valve core 73 again, facilitating the subsequent discharge of the impurities together with the hydraulic oil. When the valve core 73 continues to move to the left, the hydraulic oil flows out from the first pressure oil port 8 along the internally circulating groove and flows out from the second pressure oil port 9. When the hydraulic oil enters from the first pressure oil port 8, it will drive the scraping blade 76 to move in the direction of the valve sleeve 74 closest to the second pressure oil port 9 at this time, so that the scraping blade 76 scrapes off the impurities on the surface of the valve core 73. While the scraping blade 76 moves, the telescopic limiting rod 77 extends. Finally, the side of the scraping blade 76 close to the valve sleeve 74 is formed, so that the hydraulic oil flows out from the second pressure oil port 9.

[0034] By setting the housing 1 as a vacuum sandwich structure and arranging nano-aerogel in the sandwich layer, sudden temperature drops are avoided, which could cause the liquid in the control valve to expand and contract thermally, affecting normal operation. This reduces the thermal stress deformation of the control valve, thus ensuring the stable operation of the control valve.

[0035] By providing the wiper 76, the movement of the wiper 76 is achieved through the pressure difference, thus realizing two-way rapid response, reducing the cost of using a driving pump, and automatically scraping impurities on the surface of the valve core 73, avoiding the situation where the valve core 73 jams and affects the normal operation of the control valve.

[0036] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. An electro-hydraulic integrated control valve, comprising a housing (1), characterized in that: Inside the housing (1), a main power stage valve (3) is fixedly connected. At the top of the main power stage valve (3), a pilot stage valve (4) is fixedly connected. On the surface of the pilot stage valve (4), a power supply interface (2) is fixedly connected. Inside the pilot stage valve (4), a fixed rod (6) is fixedly connected. On the surface of the fixed rod (6), a square magnet (5) is fixedly connected. Inside the housing (1), a sealing control mechanism (7) is fixedly connected. Inside the main power stage valve (3), a first pressure oil port (8) and a second working oil port (11) are provided, and the main power stage valve (3) is also provided with a second pressure oil port (9) and a first working oil port (10). The sealing control mechanism (7) includes: An armature (71), which is fixedly connected inside the square magnet (5); A feedback rod (72), which is fixedly connected to the bottom of the armature (71); A valve core (73), which is fixedly connected to the bottom of the feedback rod (72), and on the surface of the valve core (73), a forward spiral groove (710) and a reverse spiral groove (711) are provided.

2. The electro-hydraulic integrated control valve according to claim 1, wherein: The pitch of the forward spiral groove (710) is 2 mm, the pitch of the reverse spiral groove (711) is 3 mm. The forward spiral groove (710) and the reverse spiral groove (711) are axially staggered along the valve core (73) and respectively correspond to the oil path intervals of the second working oil port (11) and the first pressure oil port (8) inside the main power stage valve (3).

3. An electro-hydraulic integrated control valve according to claim 2, characterized in that: The depth of the forward spiral groove (710) and the reverse spiral groove (711) is 0.3 mm, and the groove width is 1.5 mm.

4. An electro-hydraulic integrated control valve according to claim 3, characterized in that: On the surface of the valve core (73), a valve sleeve (74) is fixedly connected. Near the positions of the second pressure oil port (9) and the first working oil port (10), on the surface of the valve sleeve (74), a first return spring (75) is fixedly connected. On the surface of the first return spring (75), a scraping piece (76) is fixedly connected.

5. An electro-hydraulic integrated control valve according to claim 4, characterized in that: On the surface of the scraping piece (76), a wedge-shaped opening is provided. On the surface of the scraping piece (76), a telescopic limiting rod (77) is fixedly connected, and the telescopic limiting rod (77) is arranged on the surface of the valve sleeve (74) near the first pressure oil port (8) and the second working oil port (11).

6. The electro-hydraulic integrated control valve according to claim 5, characterized in that: The sealing control mechanism (7) further includes a limiting cylinder (78), which is fixedly connected to the surface of the square magnet (5). The number of the limiting cylinders (78) is two, and the two limiting cylinders (78) are symmetrically distributed about the axis of the square magnet (5).

7. An electro-hydraulic integrated control valve according to claim 6, characterized in that: Inside the limiting cylinder (78), a second return spring (79) is fixedly connected. Inside the square magnet (5), a coil (712) is slidably connected. The number of the coils (712) is two, and the armature (71) is arranged between the two coils (712).

8. An electro-hydraulic integrated control valve according to claim 1, characterized in that: The housing (1) is a vacuum sandwich structure, and the sandwich is filled with nano-aerogel.

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