Electro-hydraulic integrated control valve

Abstract

The application 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 stage main valve is fixedly connected inside the shell, a pilot stage valve is fixedly connected to the top of the power stage main valve, a power 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 frame magnet is fixedly connected to the surface of the fixed rod, a sealing control mechanism is fixedly connected to the shell, a first pressure oil port and a second working oil port are arranged in the power stage main valve, and a second pressure oil port and a first working oil port are further arranged in the power stage main valve. The electro-hydraulic integrated control valve realizes the movement of a scraping piece through a pressure difference, thereby realizing bidirectional rapid response, and has a compact and simple structure. The cost of driving a driving pump is reduced, and impurities on the surface of a valve core can be automatically scraped off, so that the situation that the valve core is stuck and the control valve cannot normally work is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-hydraulic control valves, in particular to an electro-hydraulic integrated control valve. BACKGROUND

[0002] The electro-hydraulic integrated control valve is a control element that converts electrical signals into hydraulic signals. 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 valve core to move, thereby changing the valve opening and achieving the regulation of flow 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, etc.

[0003] Refer to the invention patent with Chinese publication number "CN112709721B", the main reversing valve, the pilot reversing valve, the pilot relief valve and the two-way cartridge valve, the two working oil ports of the pilot reversing valve are connected with the left control oil port and the right control oil port at both ends of the main reversing valve; the control port of the two-way cartridge valve is connected with the oil inlet of the pilot reversing valve and the oil inlet of the pilot relief valve at the same time; the oil inlet of the main reversing valve is connected with the oil inlet of the two-way cartridge valve, and the oil return port of the main reversing valve is connected with 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 reversing valve at the same time. This design realizes the control of reversing without external control oil source, and the structure of the electro-hydraulic integrated control valve is simple, the reversing process is stable, and the pressure loss through the integrated control valve is small, which is more energy-saving and environmentally friendly.

[0004] The existing electro-hydraulic integrated control valve has no special protection structure outside, when the environmental temperature suddenly drops, the temperature inside the valve body will also change suddenly, causing the liquid inside the valve body to expand and contract, affecting its normal work. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides an electro-hydraulic integrated control valve to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application realizes the following technical scheme: an electro-hydraulic integrated control valve, comprising a shell, a power stage main valve is fixedly connected inside the shell, a pilot stage valve is fixedly connected to the top of the power stage main valve, a power 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 frame magnet is fixedly connected to the surface of the fixed rod, a sealing control mechanism is fixedly connected inside the shell, a first pressure oil port and a second working oil port are formed inside the power stage main valve, and a second pressure oil port and a first working oil port are also formed in the power stage main valve.

[0007] The sealing control mechanism comprises:

[0008] An armature is fixedly connected to the inside of the square frame magnet;

[0009] A feedback rod is fixedly connected to the bottom of the armature;

[0010] A valve core is fixedly connected to the bottom of the feedback rod, and the surface of the valve core is provided with a forward helical groove and a reverse helical groove.

[0011] Preferably, the pitch of the forward helical groove is two millimeters, the pitch of the reverse helical groove is three millimeters, the forward helical groove and the reverse helical groove are axially staggered along the valve core, and correspond to the second working oil port and the first pressure oil port oil path interval in the power stage main valve respectively, the oil film thickness of 5-10μm provides a heat conduction path, and the heat generated by friction is taken away through the oil, avoiding local overheating to cause material softening.

[0012] Preferably, the groove depth of the forward helical groove and the reverse helical groove is zero point three millimeters, and the groove width is one point five millimeters, and an oil film is formed on the surface of the valve core, the oil film separates the contact surface through the hydrodynamic pressure effect, the friction coefficient is reduced from the traditional contact type 0.15 to 0.01-0.03, and the wear rate is greatly reduced.

[0013] Preferably, the surface of the valve core is fixedly connected with a valve sleeve, and the surface of the valve sleeve close to the second pressure oil port and the first working oil port is fixedly connected with a first reset spring, the surface of the first reset spring is fixedly connected with a wiper, the wiper is made of PEEK composite material, the friction coefficient is low, the valve core movement resistance is significantly reduced, the control valve response speed is improved, the wear resistance is high, and the wiper can be soaked in hydraulic oil and acidic medium for a long time, has wide temperature range stability, and can eliminate static electricity accumulation.

[0014] Preferably, the surface of the wiper is provided with a wedge-shaped opening, the surface of the wiper is fixedly connected with a telescopic limiting rod, and the telescopic limiting rod is arranged on the surface of the valve sleeve close to the first pressure oil port and the second working oil port.

[0015] Preferably, the sealing control mechanism further comprises a limiting column body, the limiting column body is fixedly connected to the surface of the square frame magnet, the number of the limiting column body is two, and the two limiting column bodies are symmetrically distributed about the axis of the square frame magnet.

[0016] Preferably, the inside of the limiting column body is fixedly connected with a second reset spring, the inside of the square frame magnet is slidably connected with a coil, the number of the coil is two, and the armature is arranged between the two coils.

[0017] Preferably, the shell is a vacuum sandwich structure, and the sandwich is filled with nanometer aerogel, which is an ultralight solid material with a nano-porous structure, significantly reduces the influence of external temperature on the inside of the valve body, reduces thermal stress deformation, improves the movement accuracy of the valve core, reduces the overall weight of the servo valve, and is suitable for high-temperature industrial environments, long-term stable in hydraulic oil environment, avoids the decline of thermal insulation performance caused by material corrosion, although the unit price of nanometer aerogel is high, but its comprehensive performance is excellent, can significantly reduce the system operation and maintenance cost.

[0018] The application provides an electro-hydraulic integrated control valve.

[0019] 1. The electro-hydraulic integrated control valve is provided with a forward spiral groove, when the first working oil port oil circuit is opened, the smaller pitch can make the oil quickly form high pressure in the spiral groove, generate a larger axial driving force to push the valve core to move quickly, the response time is greatly shortened, and a forward high-pressure oil film bearing is formed; when the second pressure oil port oil circuit is opened, the larger pitch can make the oil flow more smoothly, reduce the flow resistance, enable the valve core to quickly respond to the instruction and move in the corresponding direction, and the response time is also greatly shortened; the threaded groove is provided to form an oil film, the stable oil film provides good lubrication conditions for the valve core, reduces the friction coefficient, further reduces the impact and vibration of the valve core during movement, ensures stable work of the control valve, and the threaded groove produces a turbulent effect to flush the surface deposits of the valve core body and reduce the attachment of impurities.

[0020] 2. The electro-hydraulic integrated control valve is provided with a vacuum sandwich structure, and nanometer aerogel is arranged in the sandwich, so that the thermal expansion and contraction of the liquid of the control valve caused by sudden temperature drop is avoided, the normal work is affected, the thermal stress deformation of the control valve is reduced, and the stable work of the control valve is ensured.

[0021] 3. The electro-hydraulic integrated control valve is provided with a scraper, the movement of the scraper is realized through a pressure difference, bidirectional quick response is realized, the structure is compact and simple, the cost of using a driving pump for driving is reduced, the surface impurities of the valve core are automatically scraped off, and the situation that the valve core is jammed and the control valve cannot work normally is avoided.

[0022] 4. The electro-hydraulic integrated control valve is provided with a modularization setting of the pilot stage valve and the power stage main valve, the pilot stage valve and the power stage main valve are separately disassembled and replaced, the whole system does not need to be disassembled, the modular maintenance is facilitated, and the normal work of the control valve is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front view of the application;

[0024] Figure 2It is a shell cross-sectional view of the present application;

[0025] Figure 3 It is a shell cross-sectional view of the present application Figure 2 It is an enlarged view of A in the present application;

[0026] Figure 4 It is a first power stage main valve cross-sectional view of the present application;

[0027] Figure 5 It is a shell cross-sectional view of the present application Figure 4 It is an enlarged view of B in the present application;

[0028] Figure 6 It is a second power stage main valve cross-sectional view of the present application;

[0029] Figure 7 It is a shell cross-sectional view of the present application Figure 6 It is an enlarged view of C in the present application;

[0030] Figure 8 It is a pilot stage valve cross-sectional view of the present application.

[0031] In the figure: 1, shell; 2, power interface; 3, power stage main valve; 4, pilot stage valve; 5, square box magnet; 6, fixed rod; 7, sealing control mechanism; 71, armature; 72, feedback rod; 73, valve core; 74, valve sleeve; 75, first reset spring; 76, scraper; 77, telescopic limiting rod; 78, limiting column; 79, second reset spring; 710, forward helical groove; 711, reverse helical groove; 712, coil; 8, first pressure oil port; 9, second pressure oil port; 10, first working oil port; 11, second working oil port. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0033] Examples of the described embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0034] Embodiment one: please refer to Figures 1-5The application provides a technical scheme: an electro-hydraulic integrated control valve, which comprises a shell 1, the inside of the shell 1 is fixedly connected with a power stage main valve 3, the top of the power stage main valve 3 is fixedly connected with a pilot stage valve 4, the surface of the pilot stage valve 4 is fixedly connected with a power supply interface 2, the inside of the pilot stage valve 4 is fixedly connected with a fixed rod 6, the surface of the fixed rod 6 is fixedly connected with a square frame magnet 5, the inside of the shell 1 is fixedly connected with a sealing control mechanism 7, the inside of the power stage main valve 3 is provided with a first pressure oil port 8 and a second working oil port 11, and the power stage main valve 3 is also provided with a second pressure oil port 9 and a first working oil port 10.

[0035] The sealing control mechanism 7 comprises:

[0036] An armature 71 is fixedly connected in the inside of the square frame magnet 5.

[0037] A feedback rod 72 is fixedly connected at the bottom of the armature 71.

[0038] A valve core 73 is fixedly connected at the bottom of the feedback rod 72, and the surface of the valve core 73 is provided with a forward helical groove 710 and a reverse helical groove 711.

[0039] The pitch of the forward helical groove 710 is 2 mm, the pitch of the reverse helical groove 711 is 3 mm, the forward helical groove 710 and the reverse helical groove 711 are axially staggered distributed along the valve core 73, and correspond to the second working oil port 11 and the first pressure oil port 8 in the power stage main valve 3 respectively.

[0040] The groove depth of the forward helical groove 710 and the reverse helical groove 711 is 0.3 mm, and the groove width is 1.5 mm.

[0041] In use, first, the power stage main valve 3 and the pilot stage valve 4 are installed in the inside of the shell 1, so that the thermal expansion and contraction of the control valve liquid caused by sudden temperature drop is avoided, the normal work is influenced, the thermal stress deformation of the control valve is reduced, and the stable work of the control valve is ensured.

[0042] By setting the forward helical groove 710, when the first working oil port 10 oil path is opened, the smaller pitch can make the oil quickly form high pressure in the helical groove, generate a larger axial driving force to push the valve core to move quickly, the response time is greatly shortened, and a positive high-pressure oil film bearing is formed, when the second pressure oil port 9 oil path is opened, by setting the reverse helical groove 711, the larger pitch can make the oil flow more smoothly, reduce the flow resistance, so that the valve core can quickly respond to the command and move in the corresponding direction, the same response time is greatly shortened, and the threaded groove is set to form an oil film, The stable oil film provides good lubrication conditions for the valve core, reduces the friction coefficient, further reduces the impact and vibration of the valve core during movement, ensures the stable work of the control valve, and the threaded groove produces a turbulent effect, which washes the surface deposits of the valve core 73, reduces the attachment of impurities.

[0043] By modularly setting the pilot stage valve 4 and the power stage main valve 3, the pilot stage valve 4 and the power stage main valve 3 can be individually disassembled and replaced without disassembling the entire system, so that the control valve can be conveniently maintained in a modular manner, thereby conveniently ensuring normal operation of the control valve.

[0044] Embodiment two: please refer to Figures 1-8 On the basis of embodiment one, the application provides a technical solution:

[0045] The surface of the valve core 73 is fixedly connected with a valve sleeve 74, and the surface of the valve sleeve 74 close to the second pressure oil port 9 and the first working oil port 10 is fixedly connected with a first reset spring 75, and the surface of the first reset spring 75 is fixedly connected with a wiper 76.

[0046] The surface of the wiper 76 is provided with a wedge-shaped opening, and the surface of the wiper 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 close to the first pressure oil port 8 and the second working oil port 11.

[0047] The sealing control mechanism 7 further comprises 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 body 78 is two, and the two limiting column bodies 78 are symmetrically distributed about the axis of the square magnet 5.

[0048] The inside of the limiting column body 78 is fixedly connected with a second reset spring 79, and the inside of the square magnet 5 is slidably connected with a coil 712, the number of the coil 712 is two, and the armature 71 is arranged between the two coils 712.

[0049] The shell 1 is a vacuum sandwich structure, and the sandwich is filled with nano aerogel.

[0050] In use, after installation is completed, in combination with Figure 4When the valve core 73 moves to the right, the hydraulic oil flows out from the second working oil port 11 along the internally flowing groove to the first working oil port 10, and when the hydraulic oil enters from the second working oil port 11, the wiper 76 is driven to move in the direction of the valve sleeve 74 closest to the first working oil port 10 at this time, so that the wiper 76 scrapes off the impurities on the surface of the valve core 73, and the telescopic limiting rod 77 is extended while the wiper 76 moves, enhancing the stability of the wiper 76 during movement, and finally the wiper 76 is close to one side of the valve sleeve 74, so that the hydraulic oil flows out from the first working oil port 10. In this process, an oil film is formed on the surface of the valve core 73, which separates the contact surface through the fluid dynamic pressure effect, reduces the friction coefficient, and can absorb the hydraulic impact energy to protect the valve core from mechanical damage, at the same time, the heat generated by friction is taken away through the oil, avoiding local overheating to cause material softening.

[0051] When the valve core 73 moves to the left, the wiper 76 will clean the impurities on the surface of the valve core 73 again, facilitating the subsequent impurities to be discharged together with the hydraulic oil, and 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 flowing groove to the second pressure oil port 9, and when the hydraulic oil enters from the first pressure oil port 8, the wiper 76 is driven to move in the direction of the valve sleeve 74 closest to the second pressure oil port 9 at this time, so that the wiper 76 scrapes off the impurities on the surface of the valve core 73, and the telescopic limiting rod 77 is extended while the wiper 76 moves, and finally the wiper 76 is close to one side of the valve sleeve 74, so that the hydraulic oil flows out from the second pressure oil port 9.

[0052] By setting the shell 1 into a vacuum sandwich structure, and setting nano aerogel in the sandwich, the sudden temperature drop caused by the control valve liquid is avoided, which affects the normal work, so as to reduce the control valve thermal stress deformation, so as to ensure the stable work of the control valve.

[0053] By setting the wiper 76, the movement of the wiper 76 is realized through the pressure difference, so as to realize the bidirectional rapid response, reduce the cost of using the driving pump to drive, and automatically scrape off the impurities on the surface of the valve core 73, avoiding the situation that the valve core 73 is jammed to affect the normal work of the control valve.

[0054] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

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

2. An electro-hydraulically integrated control valve according to claim 1, characterized in that: The pitch of the forward helical groove (710) is 2mm, the pitch of the reverse helical groove (711) is 3mm, the forward helical groove (710) and the reverse helical groove (711) are axially staggered along the valve core (73), and correspond to the second working oil port (11) and the first pressure oil port (8) in the power stage main valve (3) respectively.

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

4. An electro-hydraulically integrated control valve according to claim 3, characterized in that: The surface of the valve core (73) is fixedly connected with a valve sleeve (74), and the surface of the valve sleeve (74) close to the second pressure oil port (9) and the first working oil port (10) is fixedly connected with a first reset spring (75), and the surface of the first reset spring (75) is fixedly connected with a scraper (76).

5. An electro-hydraulically integrated control valve according to claim 4, characterized in that: The surface of the scraper (76) is provided with a wedge-shaped opening, the surface of the scraper (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) close to the first pressure oil port (8) and the second working oil port (11).

6. An electro-hydraulically integrated control valve according to claim 5, characterized in that: The sealing control mechanism (7) further comprises a limiting column body (78), the limiting column body (78) is fixedly connected to the surface of the square box magnet (5), the number of the limiting column body (78) is two, and the two limiting column bodies (78) are symmetrically distributed about the axis of the square box magnet (5).

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

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

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