A high water-based proportional directional valve and its working method

Abstract

This invention relates to a high-water-based proportional directional valve and its operating method, belonging to the field of hydraulic valves. It includes an interconnected pilot stage and a main stage. The pilot stage and the main stage both have a dual-valve-spool structure, with each side being a two-position three-way proportional valve, achieving both proportional and directional control functions. Because both the pilot and main stages are dual-valve-spool, each pilot valve spool corresponds to one main valve spool, eliminating the linkage between valve spools and providing high control freedom. The pilot stage's dual voice coil motor controls the dual valve spools to supply high-water-based fluid to the control port of the main stage, thereby pushing the valve spools to move. Ultimately, the flow rate is controlled by controlling the valve spool displacement of the main stage. The main stage of this device uses a dual-valve-spool design. Its structure is simple, easy to use, and can control the outlet flow rate as needed, simultaneously performing proportional and directional control.

Description

Technical Field

[0001] This invention relates to a high water-based proportional directional valve and its operating method, belonging to the field of hydraulic valves. Background Technology

[0002] Hydraulic transmission technology is widely used in industries such as food engineering and coal mine hydraulic supports due to its green, safe, and environmentally friendly characteristics, as well as its advantages of high power density and high power output. As one of the key components in the field of hydraulic systems, hydraulic valves have received widespread attention.

[0003] Proportional directional valves combine proportional and directional functions, controlling both the direction and flow rate of fluid. Pilot-operated hydraulic digital proportional directional valves (CN 102121487) employ PCM pilot control, offering simple operation, large main valve flow, and strong resistance to contamination. However, their main valve uses a three-position four-way spool valve, leading to significant leakage. Electro-hydraulic proportional directional valves (CN 113586108 A) propose a bracket-type proportional directional valve with a cone valve main valve, well-suited for high-water-base applications. However, its complex structure and numerous assembled parts make reliability difficult to guarantee.

[0004] Therefore, achieving stable proportional control and reversing functions under high water-based media application conditions is a problem that urgently needs to be solved in the field of hydraulic technology. Summary of the Invention

[0005] To address the shortcomings of existing technologies, a high-water-based proportional directional valve and its operating method are provided. The valve has a simple structure, is easy to use, and can control the liquid flow rate as needed, while simultaneously performing proportional control and directional control.

[0006] To achieve the above objectives, the present invention provides a high water-based proportional directional valve, comprising a pilot stage and a main stage connected to each other. The pilot stage is a dual voice coil motor driven dual valve core structure, and the main stage is a dual valve core structure. The dual voice coil motor of the pilot stage controls the dual valve cores to supply high water-based liquid to the control port of the main stage, thereby pushing the valve cores to move. Finally, the flow rate is controlled by controlling the valve core displacement of the main stage.

[0007] The main stage includes a rectangular main stage valve block. Inside the main stage valve block, two independent dual-core three-way valves are arranged side by side. The main stage valve block is located at the top of the dual-core three-way valves and is respectively provided with main valve A port and main valve B port. The side is provided with a main valve inlet and a main valve return port shared by the two dual-core three-way valves. Control port I and control port II are respectively provided on the connection surface between the main stage valve block and the pilot stage.

[0008] The main stage valve block has a three-stage stepped through-hole for accommodating the valve core. A mounting sleeve is located in the lowest stage of the three-stage stepped through-hole. The top of the mounting sleeve has a groove for mounting the valve core. Below the groove are multiple through-holes communicating with the sidewall. The gaps between the through-holes and the valve core form a control chamber surrounding the valve core. High-pressure fluid passes through this control chamber to control the main stage. The two control chambers corresponding to the dual valve cores communicate with pilot ports A and B respectively through control ports I and II on the main stage valve block. The valve core includes a first valve core, comprising an upper half and a lower half. A second valve core, capable of sliding outside the first valve core, is fitted onto the outer side of the lower half. The lower half of the first valve core and the second valve core are positioned within a groove at the top of the mounting sleeve. The upper half of the first valve core... The first valve core has a through hole at its end, which is located on the second valve core. The upper half of the first valve core has a shoulder on its outer side. A main valve seat is provided between the shoulder and the side wall of the three-stage stepped through hole, which allows the first valve core to be centered. The lower edge of the main valve seat is engaged with the top edge of the mounting sleeve to form a return cavity. A surrounding cavity is left between the top of the mounting sleeve and the inner wall of the main valve block. The surrounding cavity is connected to the return oil port of the main valve. The mounting sleeve has multiple main valve T-ports that communicate with the surrounding cavity. Since the return oil cavity is a circular structure with gaps around it, when the high water base liquid enters the return oil cavity first, it can flow back to the water tank through the circumferentially arranged main valve T-ports. The first valve core can move along the second valve core in the return oil cavity. By moving its position, it can open or close all the main valve T-ports.

[0009] A main valve sleeve is fitted on the outer side of the upper half of the first valve core within the three-stage stepped through-hole, above the main valve seat. The main valve sleeve has a stepped through-hole, which is wider at the bottom and narrower at the top. The narrower part of the through-hole matches the size of the second valve core, while a return spring is installed between the shoulder of the wider part of the through-hole and the upper surface of the shoulder of the first valve core to tightly press the second valve core against the main valve seat, limiting the maximum vertical displacement of the second valve core. The top of the second valve core is fitted with a main valve sleeve that presses the second valve core. An oil inlet chamber with an annular cavity structure is left between the outer side of the main valve sleeve and the inner wall of the main valve block. The oil inlet chamber is connected to the water inlet of the main valve. The lower part of the main valve sleeve has multiple main valve P ports connected to the oil inlet chamber. High water-based liquid is pumped in from the pump station through the main valve P ports and enters the oil inlet chamber, and then enters the interior of the main valve sleeve.

[0010] The pilot stage adjusts the position of the two first valve cores in the oil return chamber by adjusting the water pressure at pilot port A or pilot port B, respectively, through control port I and control port II, thereby affecting the opening and closing of the main valve port T. The main valve inlet and main valve return port are connected to the main stage port P and main stage port T of the two double valve core three-way valves, respectively.

[0011] Furthermore, the lower edge of the main valve sleeve extends outward, and the main valve P port is an inclined oblique hole opened on the outwardly extended portion of the lower edge; the upper opening of the mounting sleeve is an outwardly extended structure, and the main valve T port is an inclined oblique hole opened on the outwardly extended portion; the inner conical surface provided on the top of the main valve block matches the main valve sleeve, thereby restricting the vertical position of the valve sleeve.

[0012] The pilot stage includes two two-position three-way proportional cone valves arranged side by side, and two voice coil motors arranged side by side. Both voice coil motors are connected to valve blocks through motor support bases (2). Multiple fixing bolts (5) are provided on the outside of the pilot valve block for connection and fixation. Two cavities are opened side by side in the valve block. Two sets of identical valve cores are arranged parallel to each other at the bottom of the two cavities through end sleeves. Two displacement sensors are connected to the bottom of the two sets of identical valve cores respectively.

[0013] Each valve core group includes a column valve core located at the top and a spring cone valve core located at the bottom. The column valve core is connected to the voice coil motor via a positioning sleeve, and a valve rod for transmission is provided between the column valve core and the positioning sleeve.

[0014] The valve core includes an upper sleeve, a middle sleeve, and a valve seat. The upper sleeve contains a valve column, and a valve stem matching the position of the voice coil motor is fitted above the valve column via a positioning sleeve. The middle sleeve is located below the upper sleeve, and a sealing ring is provided between the middle sleeve and the upper sleeve. The valve seat is located below the middle sleeve.

[0015] The spring cone valve core includes a cone valve core pressed tightly by a spring seat, a spring rod, a spring force seat, and a sealing ring pressure block. The lower end of the cone valve core is a cylindrical structure connected to a deep hole at the top of the spring rod (12) to prevent the cone valve core from moving during operation. The spring rod (12) is equipped with a reset spring that provides pressure to the spring seat. The bottom of the spring rod is set in the spring force seat. The bottom of the spring rod and the spring force seat have holes for the displacement sensor probe to pass through. A sealing ring pressure block is provided between the hole and the displacement sensor probe. An end sleeve seal is provided between the bottom opening of the valve block cavity and the displacement sensor.

[0016] Furthermore, the upper sleeves of both sets of identical valve cores are provided with interconnected radial through holes, which extend out of the valve block to form a pilot T port for liquid return; the spring rods of both sets of valve cores are provided with interconnected radial through holes, which extend out of the valve block to form a pilot P port for liquid inlet; the middle sleeves and valve seats of the two sets of valve cores are respectively provided with two radial through holes that communicate with the outside of the valve block, which form a pilot A port and a pilot B port on the valve block.

[0017] Furthermore, the main stage includes a main stage valve block, which is connected and fixed with internal threads on the upper and lower parts. The first valve core of the main stage wraps around the lower end of the second valve core, and the lower end of the second valve core is provided with an annular groove for installing a sealing ring. An O-ring is installed in the groove to prevent high water-based media from entering the main valve T port from control port I or control port II. The first valve core is provided with a groove for installing an O-ring and a retaining ring to prevent high water-based media from entering the main valve T port from control port I or control port II. The mounting sleeve has grooves on both the upper and lower sides of the annular groove for installing O-rings to prevent leakage of high water-based media. Its bottom outer circular surface has external threads that mate with the internal threads of the valve block. Furthermore, its bottom end face has two holes for convenient fixed connection of the mounting sleeve.

[0018] Furthermore, the valve seat has an O-ring installed in a groove to prevent leakage of high-water-based media; the valve sleeve has a hollow structure, with an O-ring and a retaining ring installed inside through a groove, and its inner shoulder serves as a support surface for the return spring. Its upper outer surface is conical, tightly fitting the inner conical surface of the main valve block, and its outer surface has a groove for an O-ring; the bottom of the valve sleeve has an annular through hole, through which the high-water-based media from the pumping station can enter the valve; the upper part of the main valve block has internal threads for easy pipeline installation. The main valve block and the pilot valve block are fixedly connected by bolts.

[0019] Furthermore, the dual-core three-way valve forms three chambers within the main valve block: an inlet chamber, a return chamber, and a control chamber.

[0020] The oil inlet chamber is an annular cavity formed by the inner side of the main valve sleeve and the main valve seat. The high water-based liquid from the pump station first enters the oil inlet chamber through the main valve inlet, and then enters the valve through the P port of the main valve. The oil inlet chamber is an annular volume. The P port of the main valve has 6 ports arranged in the circumferential direction. This ensures that as long as the P port of the main valve is opened, the high water-based liquid outside can enter the valve through the P port.

[0021] The return oil chamber is an annular cavity formed by the lower part of the main valve seat and the mounting sleeve. The high water-based liquid first enters the return oil chamber, then flows back through the T port of the main valve, and finally flows back to the oil tank through the return water port of the main valve. The main valve T port has 6 ports arranged in a circumferential direction, which ensures that as long as the main valve T port is opened, the high water-based liquid inside the system can flow back to the water tank through the main valve T port.

[0022] The control chamber is located inside the mounting sleeve and connected to the bottom of the groove. The pilot stage controls the opening and closing of the main valve T port of the first valve core and controls the area of ​​the through hole on the second valve core that is connected to the oil inlet chamber, all of which are controlled by the pressure inside the control chamber.

[0023] A method for operating a high water-based proportional directional valve, comprising the following steps:

[0024] When the voice coil motor does not receive an action command, the pilot cone valve core is pressed tightly against the valve seat by the pressure of the return spring. At this time, the pilot valve port is in the closed state. Since the pilot stage includes two parallel two-position three-way cone valves, the high water-based liquid at the main valve control port flows back to the liquid tank through the pilot T port. At this time, the main valve spring presses the second valve core tightly onto the mounting sleeve, and the main valve core is in the closed state. The high water-based medium of the system can still flow back to the water tank through the main valve T port.

[0025] When one of the two voice coil motors receives an action command, the voice coil motor that received the action command pushes the valve stem to move downward. The valve stem first overcomes the gap left between itself and the valve column. The reserved gap allows the high water base liquid of the main valve control port I or the main valve control port II to return to the water tank through the pilot port T via the pilot port A or pilot port B, which are interconnected. When the valve stem moves downward but has not yet contacted the valve column, the high water base liquid of the main valve control port enters the pilot stage through the pilot port A or pilot port B, and then returns to the water tank through the pilot port T.

[0026] As the valve stem continues to move downwards, when the valve stem and valve column come into contact, the valve stem and valve column block the through hole connecting the pilot T port. At this time, the high water-based liquid enters the control chamber of the main stage. The pressure of the high water-based liquid pushes the second valve core up slightly and then pushes up the first valve core, causing the first valve core to block the main valve T port. The high water-based liquid in the control port on one side of the main valve cannot flow back to the water tank through the pilot T port, while the high water-based liquid in the control port on the other side of the main valve can flow back to the water tank through the pilot T port.

[0027] The voice coil motor continues to push the valve stem downward through the valve stem. The valve stem first overcomes the gap with the pilot cone valve core. As the displacement of the valve stem increases, the valve stem eventually pushes open the pilot cone valve core. When the pilot cone valve core leaves the valve seat, a flow area is generated between the pilot cone valve core and the valve seat that allows liquid to pass through. The high water-based liquid in the pilot stage flows through the gap between the pilot cone valve core and the valve seat 10 to the control port on one side of the main valve. At this time, the pressure at the control port on one side of the main valve increases, and the control port on the other side of the main valve is in a state of connection with the water tank.

[0028] As the high-water-based fluid from the pilot stage continuously flows into the control port on one side of the main valve, the pressure at the control port on the main valve side increases. The pressure of the high-water-based fluid overcomes the pressure of the main stage return spring and pushes up the second valve core, causing the second valve core to move continuously upward. Eventually, the through hole on the second valve core connects with the oil inlet chamber, thereby forming a flow area between the main valve P port and the through hole of the first valve core. The through hole of the first valve core connects with the oil inlet chamber through the main valve P port. At the same time, the return oil passage of the main valve remains closed. The high-water-based fluid from the pump station can flow through the flow area to the load through the main valve A port or the main valve B port.

[0029] Different flow areas correspond to different flow rates and different pilot pressures. Ultimately, the flow rate of the main valve can be controlled by controlling the voice coil motor of the pilot stage.

[0030] The displacement of the voice coil motor in different pilot stages affects the different flow areas within the pilot stage. Different flow areas correspond to different flow rates and different pilot pressures, which in turn affect the high water-based liquid entering the main stage control port and thus the pressure at the control port. By controlling the voice coil motor in the pilot stage, the flow rate of the main valve can be controlled.

[0031] Beneficial effects: The pilot stage of this device uses a voice coil motor, which has high sensitivity, large thrust, and high control precision; the pilot stage adopts a cone valve core, which has good flow linearity; the main stage adopts a dual valve core form, with a two-position three-way proportional valve on each side, realizing the functions of proportional control and directional control as a whole; because both the pilot stage and the main stage are of the dual valve core form, each pilot valve core corresponds to a main valve core, thus eliminating the linkage between valve cores, resulting in high control freedom and greater energy saving; its structure is simple, easy to use, and can control the liquid flow rate as needed, and can simultaneously perform proportional control and directional control. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the pilot stage and main stage inlet and outlet of a high water-based proportional directional valve according to the present invention.

[0033] Figure 2-1 This is a schematic diagram of the pilot stage of a high water-based proportional directional valve according to the present invention.

[0034] Figure 2-2 This is a schematic diagram of the valve block opening in the pilot stage;

[0035] Figure 3 This is a cross-sectional view of the pilot stage of a high water-based proportional directional valve of the present invention when it is not activated;

[0036] Figure 4 This is a cross-sectional view of the pilot stage of a high water-based proportional directional valve of the present invention during operation.

[0037] Figure 5 This is a schematic diagram of the valve block opening in the main stage of the present invention;

[0038] Figure 6 This is a cross-sectional view of the pilot stage and main stage of a high water-based proportional directional valve of the present invention when it is not activated;

[0039] Figure 7 This is a cross-sectional view of the pilot stage and main stage of a high water-based proportional directional valve during operation according to the present invention;

[0040] Figure 8 This is a schematic diagram of the pilot stage and main stage flow channel of a high water-based proportional directional valve according to the present invention;

[0041] Figure 9 This is an exploded view of the main stage of a high water-based proportional directional valve according to the present invention.

[0042] In the diagram: 1-Voice coil motor, 2-Motor support, 3-Valve stem, 4-Positioning sleeve, 5-Fixing bolt, 6-Valve gasket, 7-Upper sleeve, 8-Valve column, 9-Middle sleeve, 10-Valve seat, 11-Conical valve core, 12-Spring rod, 13-Pilot valve, 14-Spring force seat, 15-Sealing ring pressure block, 16-End sleeve, 17-Displacement sensor, 18-Mounting sleeve, 19-Main stage valve block, 20-First valve core, 21-Second valve core, 22-Main stage valve seat, 23-Main stage return spring, 24-Main stage valve sleeve Detailed Implementation

[0043] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0044] like Figure 1 , Figure 3 and Figure 6 As shown, a high water-based proportional directional valve of the present invention includes a pilot stage and a main stage. The pilot stage is a dual voice coil motor driven dual valve core structure. The main stage consists of two two-position three-way valve cores. The dual voice coil motor of the pilot stage controls the dual valve cores to supply high water-based liquid to the control port of the main stage, thereby pushing the valve cores to move. Finally, the flow rate is controlled by controlling the valve core displacement of the main stage.

[0045] like Figure 2-1 , Figure 2-2 , Figure 4 , Figure 5 , Figure 6 As shown, a high-water-based proportional directional valve of the present invention includes a pilot stage and a main stage. The pilot stage has a structure in which a dual voice coil motor drives a dual valve core. The main stage also has a dual valve core structure, with each main valve core consisting of a first valve core and a second valve core 21. Each main valve core has a corresponding control port. The dual voice coil motor of the pilot stage controls the dual valve cores to supply oil to the control port of the main stage, thereby pushing the valve cores to move. Finally, the flow rate is controlled by controlling the coverage area of ​​the second valve core 21 and the annular oil inlet on the main stage valve sleeve 24.

[0046] Figure 3 , Figure 4 and Figure 6 As shown, the pilot stage consists of two two-position three-way proportional cone valves, including two voice coil motors arranged side by side. Both voice coil motors are connected to valve blocks 13 through motor support bases 2. The valve blocks 13 have two cavities arranged side by side. Two sets of valve cores are arranged in parallel within the two cavities. Two displacement sensors 17 are connected to the bottom of the two sets of valve cores respectively.

[0047] The valve core assembly includes a column valve core located at the top and a spring cone valve core 11 located at the bottom. The column valve core is connected to the voice coil motor 1 by a valve stem 3 for transmission through a positioning sleeve 4. A valve pad 6 is provided between the column valve core and the positioning sleeve.

[0048] The valve core includes an upper sleeve 7, a middle sleeve 9 and a valve seat 10. The upper sleeve 7 is provided with a valve column 8. Above the valve column 8, a valve stem 3 matching the position of the voice coil motor 1 is provided through a positioning sleeve 4. The middle sleeve 9 is located below the upper sleeve 7. A sealing ring is provided between the middle sleeve 9 and the upper sleeve 7. The valve seat 10 is located below the middle sleeve 9.

[0049] The spring-loaded cone valve core includes a cone valve core 11 that is pressed tightly by a spring seat. A spring rod 12 is provided below the spring seat. The lower end of the cone valve core 11 is cylindrical and connected to a deep hole at the top of the spring rod 12 to prevent the cone valve core 11 from moving during operation. A return spring that provides pressure to the spring seat is provided inside the spring rod 12. A hole is opened at the bottom of the spring rod 11 to allow the displacement sensor 17 probe to pass through. A sealing ring pressure block 15 is provided between the hole and the displacement sensor 17 probe. An end sleeve seal is provided between the bottom opening of the valve block 13 cavity and the displacement sensor 17.

[0050] Two sets of valve cores have interconnected radial through holes at the upper sleeve 7 position, which extend out of the valve block to form a T-port for liquid return; two sets of valve cores have interconnected radial through holes at the spring rod 12 position, which extend out of the valve block 13 to form a P-port for liquid inlet; two sets of valve cores have two radial through holes between the middle sleeve 9 and the valve seat 10 respectively, which communicate with the outside of the valve block, and the two radial through holes form an A-port and a B-port on the valve block;

[0051] like Figure 7 , Figure 8 and Figure 9 As shown, the main stage adopts the form of two two-position three-way valves. The valve core of the main stage is composed of a first valve core 20 and a second valve core 21. The upper end of the second valve core 21 has a hollow hole in the vertical direction and the lower end has a through hole in the circumferential direction. The first valve core 20 and the second valve core 21 are both located in the groove of the mounting sleeve 18. The mounting sleeve 18 has a through hole in the circumferential direction, and the position is opposite to the circumferential through hole of the second valve core 21. The groove of the mounting sleeve 18 has a through hole in the circumferential direction, and a vertical hole connects the bottom of the groove to the annular groove outside the mounting sleeve 18. This annular groove corresponds to the pilot port A or port B respectively.

[0052] The return spring 23 presses the second valve core 21 tightly against the main valve seat 22. The inner hole of the main valve seat 22 is a stepped hole, which limits the maximum vertical displacement of the second valve core 21. The lower end of the main valve sleeve 24 has oblique holes arranged in a circumferential direction, and the outer end face of the upper end is a conical surface, which cooperates with the inner conical surface of the main valve block 19, thereby limiting the vertical position of the valve sleeve 24.

[0053] The main stage employs two independent three-way valves, both located in the main stage valve block 19, sharing the P and T ports of the main stage. The pilot stage adjusts the position of the first valve core 20 of the main valve within the mounting sleeve 18 by adjusting the water pressure at port A or B, thus affecting the opening and closing of the main stage return port and the degree of opening and closing. The pilot stage adjusts the position of the second valve core 21 of the main valve within the valve sleeve 24 by adjusting the oil pressure at port A or B, thus affecting the opening and closing of the main stage valve ports and the degree of opening and closing.

[0054] The voice coil motor 1 is connected to the valve block 13 via the support base 2. The voice coil motor 1 and the motor support base 2, as well as the motor support base 2 and the valve block 13, are all fixedly connected by bolts. The positioning sleeve 4 is threaded to the valve block 13. A certain axial clearance is left between the valve block 13 and the positioning sleeve 4. The valve gasket 6 is made of polyoxymethylene or polyurethane material to reduce the impact when in contact with the valve stem 8. The valve stem 3 and the positioning sleeve 4 are sealed with O-rings. The positioning sleeve 4 and the valve block 13, as well as the upper sleeve 7 and the valve block 13, are all sealed with O-rings and retaining rings to improve the pressure resistance.

[0055] The valve stem 8 and upper sleeve 7 are dynamic seals using Glyd rings; the valve seat 10 and valve block 13 are sealed with O-rings; the spring rod 12 and valve block 13 are sealed with an O-ring and a retaining ring; the dynamic seal between the spring rod 12 and spring seat 14 is a Glyd ring, and the sealing ring pressure block 15 is used to press the Glyd ring; the displacement sensor 17 contacts the spring rod, so that the displacement of the cone valve core 11 can be read on the displacement sensor 17; the external thread of the end sleeve 16 is connected to the valve block 13, and considering the machining and installation errors, there is a certain axial clearance between the valve block 13 and the end sleeve 16.

[0056] The main stage specifically includes a main stage valve block 19, which is connected and fixed with internal threads on the top and bottom. The main stage adopts two two-position three-way valves. The valve core of the main stage consists of a first valve core 20 and a second valve core 21. The first valve core 20 is located on the outer circumferential surface of the second valve core 21, and the second valve core 21 has a groove with an O-ring installed to prevent high water-based media from entering the T port. The first valve core 20 has a groove with an O-ring and a retaining ring installed to prevent high water-based media from entering the T port.

[0057] The upper end of the second valve core 21 has a hollow hole in the vertical direction, and the lower end has a through hole in the circumferential direction. The middle part has a variable diameter structure, which serves as the support surface for mounting the return spring 23. Both the first valve core 20 and the second valve core 21 are located in the groove of the mounting sleeve 18. The mounting sleeve 18 has a through hole in the circumferential direction, which is opposite to the circumferential through hole of the second valve core 21. The groove of the mounting sleeve 18 has a through hole in the circumferential direction, and a vertical hole connects the bottom of the groove to the annular groove outside the mounting sleeve 18. This cavity is the control cavity, through which the pilot high-pressure fluid controls the main valve.

[0058] The mounting sleeve 18 has grooves on both the upper and lower sides of the annular groove to install O-ring seals to prevent leakage of high water-based media. Its bottom outer circular surface has external threads that mate with the internal threads of the valve block 19. Furthermore, its bottom end face has two holes to facilitate the fixed connection of the mounting sleeve 18.

[0059] Valve seat 22 is located between valve sleeve 24 and mounting sleeve 18. Its exterior has a groove for mounting an O-ring to prevent leakage of high-water-based media. Valve sleeve 24 is hollow, with an interior groove for mounting an O-ring and a retaining ring. Its inner shoulder serves as the support surface for the return spring 23. Its upper outer surface is conical, tightly fitting the inner conical surface of the main stage valve block 19. Its exterior also has a groove for mounting an O-ring. An annular through-hole is located at the bottom of valve sleeve 24, allowing high-water-based media from the pumping station to enter the valve. The upper part of the main stage valve block 19 has internal threads for easy pipeline installation. The main stage valve block 19 and pilot valve block 13 are fixedly connected by bolts.

[0060] The specific steps are as follows:

[0061] When the voice coil motor 1 does not receive an action command, the pilot cone valve core 11 is pressed tightly against the valve seat 10 due to the pressure of the return spring. At this time, the pilot valve port is in the closed state. Since the pilot stage consists of two two-position three-way cone valves, the high water-based liquid at the main valve control port can flow back to the liquid tank through the T port of the pilot valve core. At this time, the main valve spring 23 presses the second valve core 21 tightly onto the mounting sleeve 18, and the main valve core is in the closed state. The high water-based medium of the system can still flow back to the water tank through the T port of the main valve.

[0062] When the voice coil motor 1 on one side receives the action command, the voice coil motor 1 first pushes the valve stem 3 to move downward. The valve stem 3 first overcomes the margin clearance with the valve column 8. The margin clearance allows the high water base liquid in the main valve control port to flow to the pilot stage's T port back to the water tank when the pilot stage is not in motion. When the valve stem 4 moves downward but has not yet contacted the valve column 8, the high water base liquid in the main valve control port enters the pilot stage through the pilot A port or B port, and then returns to the water tank through the pilot stage's T port.

[0063] As the valve stem 3 continues to move downward, when the valve stem 3 and the valve column 8 come into contact, the valve stem 3 and the valve column 8 block the through hole of the T-port. At this time, the return oil channel from the high water-based liquid in the control port on one side of the main valve to the water tank is closed. The high water-based liquid in the control port on one side of the main valve cannot flow back to the water tank through the T-port of the pilot stage. At this time, the high water-based liquid in the control port on the other side of the main valve can flow back to the water tank through the T-port of the pilot stage.

[0064] As valve stem 3 continues to move downward, valve rod 8 is simultaneously pushed downward by valve stem 3.

[0065] The valve stem 8 first overcomes the gap with the cone valve core 11. As the displacement of the valve stem 8 increases, the valve stem 8 eventually pushes open the cone valve core 11. When the cone valve core 11 leaves the valve seat, a flow area is generated between the cone valve core 11 and the valve seat 10 that allows liquid to pass through. The high water-based liquid in the pilot stage flows through the gap between the cone valve core 11 and the valve seat 10 to the control port on one side of the main valve. At this time, the pressure at the control port on one side of the main valve increases, and the control port on the other side of the main valve is in a state of connection with the water tank.

[0066] As the high-water-based fluid from the pilot stage continuously flows into the control port on one side of the main valve, the pressure at that port increases. Because the bottom of the first valve core is subjected to this pressure, the first valve core moves upwards as the pressure increases, eventually closing the return oil passage of the main valve. At this point, the high-water-based fluid in the system cannot return to the water tank through the return oil passage. As the pressure at the control port on one side of the main valve continues to increase, the second valve core 21 overcomes the elastic force of the spring 23 and other external forces, causing it to move upwards. With continued upward movement, the P port of the main valve and the shoulder of the second valve core 21 eventually form a flow area. The high-water-based fluid from the pump station can flow to the load through this flow area. Different flow areas correspond to different flow rates and different pilot pressures. Ultimately, the flow rate of the main valve can be controlled by controlling the voice coil motor of the pilot stage.

[0067] The displacement of the voice coil motor 1 in different pilot stages affects the different flow areas within the pilot stage, thereby affecting the high water-based liquid entering the main stage control port and thus the pressure at the control port. Ultimately, this leads to different openings in the main valve core, achieving proportional control of the flow rate.

Claims

1. A high water-based ratio directional valve characterized by: It includes a pilot stage and a main stage that are interconnected. The pilot stage is a dual voice coil motor driven dual valve core structure, and the main stage is a dual valve core structure. The dual voice coil motor of the pilot stage controls the dual valve cores to supply high water-based liquid to the control port of the main stage, thereby pushing the valve cores to move. Finally, the flow rate is controlled by controlling the valve core displacement of the main stage. The main stage includes a rectangular main stage valve block (19). Two independent double-core three-way valves are arranged side by side inside the main stage valve block (19). The main stage valve block (19) is located on the top of the double-core three-way valves and is provided with main valve A port and main valve B port respectively. The side is provided with a main valve inlet and a main valve return port shared by the two double-core three-way valves. The main stage valve block (19) and the pilot stage are respectively provided with control port I and control port II on the connection surface. The main stage valve block (19) is provided with a three-stage stepped through hole for accommodating the valve core. The lowest stage space of the three-stage stepped through hole is provided with an installation sleeve (18). The top of the installation sleeve (18) is provided with a groove for installing the valve core. Below the groove are multiple through holes communicating with the side wall. The gap between the through holes and the valve core forms a control cavity surrounding the valve core. The high-pressure liquid controls the main stage after passing through the control cavity. The two control cavities corresponding to the dual valve cores are respectively connected to the pilot port A and the pilot port B through the control port I and control port II opened on the main stage valve block (19). The valve core includes a first valve core (20). The first valve core (20) includes an upper part and a lower part. The lower part is fitted with a second valve core (21) that can slide outside the first valve core (20). The lower part of the first valve core (20) and the second valve core (21) are set in the groove at the top of the installation sleeve (18). The upper part of the first valve core (20) The interior is provided with a through hole, and the end of the through hole is located on the second valve core (21) with a circumferential through hole. The upper half of the first valve core (20) has a shoulder on the outer side of the terminal. The shoulder and the side wall of the three-stage stepped through hole are provided with a main valve seat (10) that allows the first valve core (20) to be placed in the center. The lower edge of the main valve seat (10) is engaged with the top edge of the mounting sleeve (18) to form a return cavity. The top of the mounting sleeve (18) and the inner wall of the main valve block (19) are left with a surrounding cavity. The surrounding cavity is connected to the main valve return port. The mounting sleeve (18) has multiple main valve T ports that communicate with the surrounding cavity. Since the return cavity is a circular structure with gaps around it, when the high water base liquid enters the return cavity first, it can flow back to the water tank through the circumferentially arranged main valve T ports. The first valve core (20) can move along the second valve core (21) in the return cavity. By moving the position, all main valve T ports can be opened or closed. The main valve sleeve (24) is fitted on the outer side of the upper half of the first valve core (20) above the main valve seat (10) within the three-stage stepped through hole. The stepped through hole in the main valve sleeve (24) is thicker at the bottom and thinner at the top. The size of the thinner part of the through hole matches that of the second valve core (21). The shoulder of the thicker part of the through hole is provided between the shoulder of the through hole and the upper surface of the shoulder of the first valve core (20). The main return spring (23) tightly holds the second valve core (21) towards the main valve seat (10). The second valve core (21) is squeezed and its maximum vertical displacement is limited. The top of the second valve core (21) is provided with a main valve sleeve (24) to press the second valve core (21). An oil inlet chamber with an annular cavity structure is left between the outer side of the main valve sleeve (24) and the inner wall of the main valve block (19). The oil inlet chamber is connected to the water inlet of the main valve. The main valve sleeve (24) is provided with multiple main valve P ports connected to the oil inlet chamber in the circumferential direction of the lower side. The high water-based liquid pumped in from the main valve P port by the pump station enters the oil inlet chamber and then enters the interior of the main valve sleeve (24). The pilot stage adjusts the position of the two first valve cores (20) in the oil return chamber by adjusting the water pressure at the pilot port A or pilot port B through control port I and control port II, thereby affecting the opening and closing of the main valve T port. The main valve inlet and the main valve return port are connected to the main stage P port and the main stage T port of the two double valve core three-way valves, respectively.

2. The high water-based ratio directional valve of claim 1, wherein: The lower edge of the main valve sleeve (24) extends outward, and the main valve P port is an inclined oblique hole opened on the outwardly extended part of the lower edge; the upper opening of the mounting sleeve (18) is an outwardly extended structure, and the main valve T port is an inclined oblique hole opened on the outwardly extended part; the main valve sleeve (24) matches the inner conical surface provided on the top of the main valve block (19), thereby restricting the vertical position of the main valve sleeve (24).

3. The high water-based ratio directional valve of claim 1, wherein: The pilot stage includes two parallel two-position three-way proportional cone valves and two parallel voice coil motors. Both voice coil motors are connected to a pilot valve block (13) through a motor support (2). Multiple fixing bolts (5) are provided on the outside of the pilot valve block (13) for connection and fixation. Two cavities are opened in parallel inside the pilot valve block (13). Two sets of identical valve cores are provided in parallel at the bottom of each cavity through an end sleeve (16). Two displacement sensors (17) are connected to the bottom of the two sets of identical valve cores respectively. Each valve core includes a column valve core at the top and a spring cone valve core at the bottom. The column valve core is connected to the voice coil motor (1) via a positioning sleeve (4) and a valve stem (3) for transmission is provided. A valve pad (6) is provided between the column valve core and the positioning sleeve. The valve core includes an upper sleeve (7), a middle sleeve (9) and a valve seat (10). The upper sleeve (7) is provided with a valve column (8). Above the valve column (8) is a valve stem (3) that matches the position of the voice coil motor (1) via a positioning sleeve (4). The middle sleeve (9) is located below the upper sleeve (7). A sealing ring is provided between the middle sleeve (9) and the upper sleeve (7). The valve seat (10) is located below the middle sleeve (9). The spring cone valve core includes a cone valve core (11) pressed tightly by a spring seat, a spring rod (12), a spring force seat (14), and a sealing ring pressure block (15). The lower end of the cone valve core (11) is a cylindrical structure connected to a deep hole at the top of the spring rod (12) to prevent the cone valve core (11) from moving during operation. The spring rod (12) is equipped with a main stage return spring that provides pressure to the spring seat. The bottom of the spring rod (12) is set in the spring force seat (14). The bottom of the spring rod (12) and the spring force seat (14) have holes for the probe of the displacement sensor (17) to pass through. A sealing ring pressure block (15) is provided between the hole and the probe of the displacement sensor (17). The bottom opening of the cavity of the pilot valve block (13) is sealed with an end sleeve between it and the displacement sensor (17).

4. The high water-based proportional directional valve according to claim 3, characterized in that: Both sets of identical valve cores have interconnected radial through holes at the upper sleeve (7) position. These radial through holes extend out of the valve block to form a pilot T port for liquid return. Both sets of valve cores have interconnected radial through holes at the spring rod (12) position. These radial through holes extend out of the pilot valve block (13) to form a pilot P port for liquid inlet. The middle sleeve (9) and valve seat (10) of both sets of valve cores are respectively provided with two radial through holes that communicate with the outside of the valve block. These two radial through holes form a pilot A port and a pilot B port on the valve block.

5. The high water-based proportional directional valve according to claim 1, characterized in that: The main stage includes a main stage valve block (19), which is connected and fixed with internal threads on the top and bottom. The first valve core (20) of the main stage wraps around the lower end of the second valve core (21), and the lower end of the second valve core (21) is provided with an annular groove for installing a sealing ring. An O-ring is installed in the groove to prevent the high water-based medium of control port I or control port II from entering the main valve T port. The first valve core (20) is provided with a groove for installing an O-ring and a retaining ring to prevent the high water-based medium of control port I or control port II from entering the main valve T port. The mounting sleeve (18) has grooves on both the upper and lower sides of the annular groove for installing O-rings to prevent the high water-based medium from leaking. Its bottom outer circular surface has external threads that mate with the internal threads of the main stage valve block (19). Its bottom end face has two holes for easy fixing and connection of the mounting sleeve (18).

6. The high water-based proportional directional valve according to claim 5, characterized in that: The valve seat (10) is fitted with an O-ring through a groove to prevent leakage of high water-based media; the main valve sleeve (24) is a hollow structure, with an O-ring and a retaining ring installed inside through a groove, and its inner shoulder serves as the support surface for the main return spring (23). Its upper outer circular surface is a conical surface, which fits tightly with the inner conical surface of the main valve block (19), and its outer surface has a groove fitted with an O-ring; the bottom of the main valve sleeve (24) has an annular through hole, through which the high water-based media of the pump station enters the valve; the upper part of the main valve block (19) has an internal thread to facilitate pipeline installation; the main valve block (19) and the pilot valve block (13) are fixedly connected by bolts.

7. The high water-based proportional directional valve according to claim 1, characterized in that: The dual-core three-way valve forms three chambers within the main valve block (19): an inlet chamber, a return chamber, and a control chamber. The oil inlet chamber is an annular cavity between the inner wall of the main valve sleeve (24) and the main valve block (19). The high water-based liquid from the pump station first enters the oil inlet chamber through the main valve inlet and then enters the valve through the main valve P port. The oil inlet chamber is an annular volume. The main valve P port has 6 ports arranged in the circumferential direction, which ensures that as long as the main valve P port is opened, the high water-based liquid outside will enter the valve through the P port. The return oil chamber is an annular cavity formed by the lower part of the main valve seat (10) and the mounting sleeve (18). The high water base liquid first enters the return oil chamber, then flows back through the main valve T port, and finally flows back to the oil tank through the main valve return water port. The main valve T port has 6 ports arranged in the circumferential direction, which ensures that as long as the main valve T port is opened, the high water base liquid inside the system will flow back to the water tank through the main valve T port. The control chamber is set inside the mounting sleeve (18) and connected to the bottom of the groove. The pilot stage controls the opening and closing of the main valve T port of the first valve core (20) and controls the area of ​​the through hole on the second valve core (21) that is connected to the oil inlet chamber, all of which are controlled by the pressure inside the control chamber.

8. A method for operating a high water-based proportional directional valve, characterized in that... The steps are as follows: When the voice coil motor (1) does not receive an action command, the pilot cone valve core (11) is pressed tightly against the valve seat (10) by the pressure of the main stage return spring. At this time, the pilot valve port is closed. Since the pilot stage includes two two-position three-way cone valves arranged side by side, the high water-based liquid at the main valve control port flows back to the liquid tank through the pilot T port. At this time, the main stage return spring (23) presses the second valve core (21) on the mounting sleeve (18). The main valve core is closed, and the high water-based medium of the system still flows back to the water tank through the main valve T port. When one of the two voice coil motors (1) receives an action command, the voice coil motor (1) that receives the action command pushes the valve stem (3) downward. The valve stem (3) first overcomes the gap between itself and the valve column (8). The reserved gap allows the high water base liquid of the main valve control port I or the main valve control port II to return to the water tank through the pilot port T via the pilot port A or pilot port B, when the valve stem (3) moves downward but has not yet contacted the valve column (8), the high water base liquid of the main valve control port enters the pilot stage through the pilot port A or pilot port B, and then returns to the water tank through the pilot port T. As the valve stem (3) continues to move downward, when the valve stem (3) and valve column (8) come into contact, the valve stem (3) and valve column (8) block the through hole connecting the pilot T port. At this time, the high water base liquid enters the control chamber of the main stage. The pressure of the high water base liquid pushes the second valve core (21) up slightly and then pushes the first valve core (20) up, so that the first valve core (20) blocks the main valve T port. The high water base liquid in the control port on one side of the main valve cannot flow back to the water tank through the pilot T port, while the high water base liquid in the control port on the other side of the main valve can flow back to the water tank through the pilot T port. The voice coil motor (1) continues to push the valve column (8) downward through the valve stem (3). The valve column (8) first overcomes the gap with the pilot cone valve core (11). As the displacement of the valve column (8) increases, the valve column (8) finally pushes open the pilot cone valve core (11). When the pilot cone valve core (11) leaves the valve seat, a flow area that allows liquid to pass is generated between the pilot cone valve core (11) and the valve seat (10). The high water base liquid in the pilot stage flows to the control port on one side of the main valve through the gap between the pilot cone valve core (11) and the valve seat (10). At this time, the pressure of the control port on one side of the main valve increases, and the control port on the other side of the main valve is in the state of being connected to the water tank. As the high water-based liquid from the pilot stage continuously flows into the control port on one side of the main valve, the pressure at the control port on one side of the main valve increases. The pressure of the high water-based liquid overcomes the pressure of the main stage return spring (23) and pushes up the second valve core (21), causing the second valve core (21) to move upward continuously. Finally, the through hole on the second valve core (21) connects with the oil inlet chamber, thereby forming a flow area between the main valve P port and the through hole of the second valve core (22). The through hole of the second valve core (22) connects with the oil inlet chamber through the main valve P port. At the same time, the return oil channel of the main valve remains closed. The high water-based liquid from the pump station flows through the flow area to the load through the main valve A port or the main valve B port. Different flow areas correspond to different flow rates and different pilot pressures. Ultimately, the flow rate of the main valve is controlled by controlling the voice coil motor of the pilot stage. The displacement of the voice coil motor (1) of different pilot stages affects the different flow areas in the pilot stage. Different flow areas correspond to different flow rates and different pilot pressures, thus affecting the high water base liquid entering the main stage control port and thus affecting the pressure of the control port. The flow rate of the main valve can be controlled by controlling the voice coil motor of the pilot stage.

Images