Double active control high pressure and high flow high water-based digital throttle valve and control method

Abstract

The application relates to a double-active-control high-pressure large-flow high-water-base digital throttle valve and a control method, wherein the main valve adopts a symmetrical cylinder structure and has upper and lower control cavities; the pilot valve is a two-position three-way normally closed ball valve structure; each ball valve is driven by a normally open high-speed on-off valve; the displacement of the pilot valve is controlled by using a PWM duty cycle signal; the pressure difference of the two control cavities of the main valve is used to drive the main valve core to move; the output flow of the main valve is accurately controlled by using a displacement sensor; the main valve, the pilot valve and the pilot valve drive are all ball valves, so that the main valve can keep good sealing under the working conditions of pure water and high-water-base; the pilot valve adopts a pair of two-position three-way ball valves, so that the response speed of the main valve core is fast, and the required flow of the system can be quickly adjusted; the main valve, the pilot valve and the pilot valve drive all adopt plug-in structures, so that the structure is compact and easy to install; the high-speed on-off valve is used as the drive, and the output force is large without the need of introducing mechanical structures such as levers or ball screws.

Description

Technical Field

[0001] This invention relates to a dual-active control high-pressure, high-flow, high-water-based digital throttle valve and its control method, belonging to the field of hydraulic components. Background Technology

[0002] Cartridge valves are widely used in high-pressure, high-flow-rate applications such as casting, forging, metallurgy, and mining due to their simple structure, low leakage, large flow capacity, and versatility. Two-way cartridge proportional valves, compared to proportional / servo valves, can achieve high-flow-rate proportional control in a circuit. However, these valves rely on high-response servo spool valves as pilots, resulting in high cost, poor contamination resistance, and demanding maintenance requirements. Furthermore, they suffer from severe leakage under pure water or high-water-base conditions. Therefore, there is an urgent need for a high-flow-rate, fast-response, and low-cost hydraulic pilot valve to drive two-way cartridge valves and achieve speed control of actuators in high-flow-rate hydraulic systems. In this context, digital valves have become a key research focus.

[0003] Compared to proportional valves, digital valves offer advantages such as energy saving, simple manufacturing processes, stable and reliable operation, and strong anti-interference capabilities. Digital valves are categorized into incremental digital valves and high-speed switching valves. Incremental digital valves suffer from problems such as large inertia, severe phase lag, numerous nonlinear factors, and dead zones and zero-point drift caused by friction and wear. High-speed switching valves, on the other hand, are characterized by low cost, low power consumption, simple structure, and reliable operation. However, due to the interrelationship between valve core mass, hydraulic force, and frequency response, high-speed switching valves face limitations in terms of low pressure and low flow rate, and are therefore often used as pilot valves for high-flow-rate valves.

[0004] In view of the problems existing in current high-pressure, high-flow, and high-water-based flow valves, there is an urgent need to propose a high-pressure, high-flow, and high-water-based digital throttling valve that can overcome the above problems. Summary of the Invention

[0005] This invention provides a dual-active control high-pressure, high-flow, high-water-based digital throttle valve and control method, which has excellent sealing performance, simple installation, fast response speed, low leakage and strong anti-pollution ability.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A dual-active control high-pressure, high-flow, high-water-based digital throttle valve includes a main valve and a pilot valve. The main valve body includes a main valve core and a main valve seat. The main valve core is coaxially disposed inside the main valve seat. The inlet of the main valve core has a cone valve structure. A boss protrudes outward from the circumferential wall of the main valve core near the outlet. The boss divides the chamber inside the main valve seat into a main valve control upper chamber and a main valve control lower chamber. On the central axis of the main valve, from the main valve core inlet to the outlet, the main valve control upper chamber is located at the top of the main valve control lower chamber.

[0008] A flow channel c is opened at the axial position of the main valve core. A damping hole of the main valve core is installed near the inlet of the main valve core in the flow channel c. The high water-based liquid flows into the upper chamber of the main valve near the top of the main valve seat through the damping hole and the flow channel c in sequence, forming a pressure balance in the main valve seat.

[0009] The pilot valve includes two identical two-position three-way ball valves, namely pilot valve I and pilot valve II. Pilot valve I and pilot valve II are threaded into the pilot valve body. Pilot valve I is connected to the lower control chamber of the main valve, and pilot valve II is connected to the upper control chamber of the main valve. By controlling the pressure in the upper control chamber and the lower control chamber of the main valve, the axial movement of the main valve core in the main valve seat is controlled, thereby achieving flow regulation.

[0010] As a further preferred embodiment of the present invention, the main valve further includes a sensor push rod, a main valve core displacement sensor, and a main valve spring. One end of the sensor push rod is embedded in the top end of the main valve core, and the other end of the sensor push rod is threadedly connected to the main valve core.

[0011] A main valve spring adjusting nut is installed on the other end of the sensor push rod, that is, a groove is opened in the part of the main valve spring adjusting nut facing the sensor push rod, and the other end of the sensor push rod is embedded in the groove.

[0012] A main valve core displacement sensor is installed between the other end of the sensor push rod and the closed end of the main valve spring adjusting nut. A main valve spring is sleeved on the outside of the structure formed by the sensor push rod and the main valve core displacement sensor.

[0013] As a further preferred embodiment of the present invention, the pilot valve I or pilot valve II includes an upper pilot valve core, a sealing block, a middle pilot valve core, a ball valve seat, a ball valve core, a ball valve reset seat, and a pilot valve plug, which are sequentially and coaxially mounted in the pilot cartridge valve body.

[0014] A trapezoidal groove is made on the top of the ball valve reset seat, the ball valve core is embedded in the trapezoidal groove, a reset seat boss is provided at the bottom of the ball valve reset seat, a screw plug boss is provided on the top of the pilot valve screw plug, one end of the ball valve reset spring is inserted into the reset seat boss, and the other end of the ball valve reset spring is inserted into the screw plug boss.

[0015] The space between the ball valve seat, ball valve core, ball valve reset seat and pilot valve plug forms a pilot oil inlet chamber;

[0016] The pilot inlet chamber of pilot valve II is connected to the pilot inlet port through flow channel h, and the pilot inlet chamber of pilot valve I is connected to the pilot inlet chamber of pilot valve II through flow channel i.

[0017] As a further preferred embodiment of the present invention, a middle pilot valve sleeve is fitted outside the middle pilot valve core, the portion of the middle pilot valve core near the bottom is located inside the ball valve seat, and the diameter of the portion of the middle pilot valve core located in the middle pilot valve sleeve is larger than the diameter of the portion of the middle pilot valve core located in the ball valve seat.

[0018] An annular boss protrudes outward from the outer wall of the middle part of the pilot valve core, and the diameter of the annular boss is larger than the diameter of the central hole of the pilot valve sleeve.

[0019] As a further preferred embodiment of the present invention, the space between the middle pilot valve sleeve, the middle pilot valve core and the ball valve seat forms the main valve control chamber, and the space between the upper pilot valve core, the sealing block and the middle pilot valve sleeve forms the pilot return oil chamber. The middle pilot valve core has a conical structure with a hole inside, which connects the main valve control chamber and the pilot return oil chamber.

[0020] The space between the top of the upper pilot valve core and the pilot cartridge valve body forms a pilot control chamber;

[0021] The main valve control chamber is connected to the main valve control chamber of pilot valve II via flow channel b.

[0022] The lower control chamber of the main valve is connected to the main valve control chamber of pilot valve I through flow channel a;

[0023] As a further preferred embodiment of the present invention, the outer side of the middle pilot valve sleeve is threadedly connected to the pilot cartridge valve body; an upper pilot valve spring is sleeved on the outside of the structure formed by the upper pilot valve core, the sealing block and the middle pilot valve core located at the top of the middle pilot valve sleeve.

[0024] One end of the upper pilot valve spring is in contact with the upper pilot valve core, and the other end of the upper pilot valve spring is in contact with the middle pilot valve sleeve;

[0025] The top of the sealing block is attached to the upper pilot valve core, and the bottom of the sealing block is attached to the middle pilot valve core.

[0026] As a further preferred embodiment of the present invention, a high-speed switching valve is coaxially inserted into the top of the pilot cartridge valve body, and the high-speed switching valve is connected to the pilot cartridge valve body by a thread.

[0027] As a further preferred embodiment of the present invention, the oil inlet of the high-speed switching valve is connected to the pilot control chamber via the flow channel k;

[0028] The high-speed switching valve outlet is connected to the pilot return port through sequentially connected flow channels d, e, g, pilot return oil chamber, and f.

[0029] The pilot oil inlet chamber is connected to the pilot damping orifice, flow channel g, flow channel m and pilot control chamber in sequence;

[0030] A control method based on the aforementioned dual active control high-pressure, high-flow, high-water-based digital throttle valve, wherein when the digital throttle valve does not require output flow, the high-speed switching valve is a normally open valve, and the high-water-based liquid in the pilot control chamber of pilot valve I and pilot valve II is connected to the oil inlet of the high-speed switching valve through flow channel k. Then, the high-water-based liquid is connected to the pilot return port through the return port of the high-speed switching valve in sequence through flow channels d, e, j, pilot return oil chamber and flow channel f. The pressure in the pilot control chamber of pilot valve I and pilot valve II tends to be zero.

[0031] Under the action of the upper pilot valve spring, the sealing block at the bottom of the upper pilot valve core and the middle pilot valve core are separated. The ball valve cores of both pilot valve I and pilot valve II are in the closed state. The pressure in the upper control chamber and the lower control chamber of the main valve are both zero. The pressure at the inlet of the main valve is equal to the pressure in the upper chamber of the main valve. Under the action of the main valve spring, the main valve core is in contact with the main valve seat. The displacement of the main valve core is zero, and no flow passes through.

[0032] When the output flow rate of the flow valve changes, the displacement of the main valve core is calculated based on the relationship between the flow rate and displacement at the main valve inlet. The calculated displacement signal is then converted into a PWM duty cycle signal for the high-speed switching valve. By controlling the proportion of the switching time in a single cycle of the high-speed switching valve, the pressure of the pilot control chambers of the matching pilot valve I and pilot valve II is controlled, thereby controlling the flow rate of pilot valve I and pilot valve II flowing into or out of the matching main valve control chamber.

[0033] As a further preferred embodiment of the present invention, the specific process of controlling the flow rate of pilot valve I and pilot valve II into or out of the control chamber of the matching main valve is as follows:

[0034] When the required flow rate of the flow valve increases, i.e., the opening degree of the main valve core increases, the duty cycle of the high-speed switching valve of pilot valve II is changed, causing the pressure in the pilot control chamber of pilot valve II to gradually decrease. Under the action of the upper pilot valve spring, the sealing block at the bottom of the upper pilot valve core separates from the middle pilot valve core, and the ball valve core of pilot valve II is in the closed state. The emulsion in the upper chamber of the main valve control returns from the main valve control chamber of pilot valve II, the inner hole of the middle pilot valve core, and the pilot return oil chamber to the pilot return oil port, and the pressure in the upper chamber of the main valve control decreases. At the same time, by changing the high-speed switching valve of pilot valve I... The duty cycle of the quick-start valve causes the pressure in the pilot control chamber of pilot valve I to gradually increase. Under the action of the pilot control chamber pressure, the upper pilot valve core moves axially towards the pilot valve plug. The sealing block installed on the upper pilot valve core blocks the flow channel of the middle pilot valve core, isolating the main valve control chamber and the pilot return oil chamber. Under the action of the upper pilot valve core, the middle pilot valve core continues to move axially towards the pilot valve plug, increasing the opening of the ball valve core. The pressure in the lower chamber of the main valve control increases, and under the pressure difference generated, the opening of the main valve core increases, and the output flow of the main valve increases.

[0035] When the required flow rate of the flow valve decreases, i.e., the opening degree of the main valve core decreases, the duty cycle of the high-speed switching valve of pilot valve I is changed, causing the pressure in the pilot control chamber of pilot valve I to gradually decrease. Under the action of the upper pilot valve spring, the sealing block at the bottom of the upper pilot valve core separates from the middle pilot valve core, and the ball valve core of pilot valve I is in the closed state. The emulsion in the upper chamber of the main valve control returns from the main valve control chamber of pilot valve I, the inner hole of the middle pilot valve core, and the pilot return oil chamber to the pilot return oil port, and the pressure in the lower chamber of the main valve control decreases. At the same time, the high-speed switching valve of pilot valve II is changed... The duty cycle of the closed valve causes the pressure in the pilot control chamber of pilot valve II to gradually increase. Under the action of the pilot control chamber pressure, the upper pilot valve core moves axially towards the pilot valve plug. The sealing block installed on the upper pilot valve core blocks the flow channel of the middle pilot valve core, isolating the main valve control chamber and the pilot return oil chamber. Under the action of the upper pilot valve core, the middle pilot valve core continues to move axially towards the pilot valve plug, increasing the opening of the ball valve core. The pressure in the upper control chamber of the main valve increases, and under the pressure difference generated, the opening of the main valve core decreases, and the output flow of the main valve decreases.

[0036] The main valve core displacement signal measured by the main valve core displacement sensor is compared with the expected main valve core displacement signal, and the error signal is input to the controller to control the displacement of the main valve core.

[0037] By employing the above technical solutions, the present invention has the following beneficial effects compared to the prior art:

[0038] 1. The dual active control high pressure, high flow rate, and high water base digital throttle valve provided by the present invention uses a high-speed switching valve as the drive, which has the characteristics of large driving force, anti-pollution and fast response speed, while avoiding the introduction of mechanical structure, which brings problems such as large inertia, dead zone and zero drift.

[0039] 2. The dual active control high pressure, high flow rate, and high water-based digital throttle valve provided by this invention has a cartridge-type structure for its main valve, pilot valve, and high-speed switching valve used as the drive, which is compact and has good sealing performance.

[0040] 3. The dual active control high pressure, high flow rate, and high water base digital throttle valve provided by this invention has a cone valve structure for the oil inlet of the main valve and a ball valve structure for the pilot valve, which has good sealing performance and can adapt to high water base or pure water working conditions.

[0041] 4. The dual active control high pressure, high flow rate, and high water base digital throttle valve provided by this invention controls the upper control chamber and lower control chamber of the main valve through two two-position three-way valves respectively, thereby achieving dual active control of the main valve and ensuring a fast response time for the main valve. Attached Figure Description

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Figure 1 This is a hydraulic schematic diagram of a preferred embodiment provided by the present invention;

[0044] Figure 2 This is a partial sectional view of the main view of a preferred embodiment provided by the present invention;

[0045] Figure 3 This invention provides Figure 2 The preferred embodiment shown is a cross-sectional view AA.

[0046] Figure 4 This invention provides Figure 3 The BB cross-sectional view in the preferred embodiment shown;

[0047] Figure 5 This is a control principle diagram of a preferred embodiment provided by the present invention.

[0048] In the diagram: 1 is the main valve core, 2 is the main valve seat, 3 is the main valve body, 4 is the lower control chamber of the main valve, 5 is the upper control chamber of the main valve, 6 is flow channel a, 7 is flow channel b, 8 is the main valve spring, 9 is the sensor push rod, 10 is the main valve core displacement sensor, 11 is the main valve spring adjusting nut, 12 is the pilot valve, 13 is flow channel c, 14 is the main valve core damping orifice, 15 is flow channel d, 16 is flow channel e, 17 is flow channel f, 18 is flow channel g, 19 is flow channel h, 20 is flow channel i, 21 is pilot valve I, and 22 is pilot valve II. 23 is a high-speed switching valve, 24 is a pilot cartridge valve body, 25 is an upper pilot valve core, 26 is flow channel j, 27 is an upper pilot valve spring, 28 is a sealing block, 29 is a middle pilot valve sleeve, 30 is a middle pilot valve core, 31 is a ball valve seat, 32 is a ball valve core, 33 is a pilot damping orifice, 34 is a ball valve reset seat, 35 is a ball valve reset spring, 36 is a pilot valve plug, 37 is a flow channel k, 38 is a pilot control chamber, 39 is a flow channel m, 40 is a pilot return oil chamber, 41 is a main valve control chamber, and 42 is a pilot inlet oil chamber. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

[0050] As described in the background section, when performing proportional control of large flow rates in a circuit, the preferred two-way cartridge proportional valve typically uses a spool valve as a pilot, resulting in high cost, poor anti-pollution performance, and high maintenance requirements. Therefore, after weighing various factors, this application proposes a high-pressure, high-flow, high-water-based digital throttle valve. The main valve, pilot valve 12, and drive valve of this valve all adopt a cartridge structure, which has good sealing performance, is easy to install, and has the characteristics of fast response, low leakage, and strong anti-pollution capability. To achieve the above characteristics, the high-pressure, high-flow, high-water-based digital throttle valve provided in this application uses a high-speed switching valve to drive two two-position three-way ball valves as pilots to achieve two-stage flow amplification; then, the pilot valve drives a two-way cartridge cone valve.

[0051] Figure 1 The diagram shown is a hydraulic schematic of a preferred embodiment of this application. The pilot valve adopts a two-position three-position normally closed ball valve structure, driven by a normally open high-speed switching valve 23. Since the main valve adopts a symmetrical cylinder cone valve structure with two symmetrical control chambers, the overflow of the pilot control chamber can be controlled by using a PWM duty cycle signal to control the displacement of the pilot valve, thereby controlling the pressure difference between the two control chambers of the main valve, realizing the displacement of the main valve, and achieving the purpose of controlling the flow of the main valve.

[0052] Figure 2 The diagram shown is a partial cross-sectional view of the overall structure of a preferred embodiment of this application, including a main valve and a pilot valve. The main valve body 3 of the main valve includes a main valve core 1 and a main valve seat 2. The main valve core is coaxially disposed inside the main valve seat. The inlet of the main valve core is a cone valve structure. A boss protrudes outward from the circumferential wall of the main valve core near the outlet, forming a boss. The boss divides the chamber inside the main valve seat into a main valve control upper chamber 5 and a main valve control lower chamber 4. On the central axis of the main valve, from the main valve core inlet to the outlet, the main valve control upper chamber is located at the top of the main valve control lower chamber. This application has two prominent advantages. First, a flow channel c13 is opened in the axial position of the main valve core. A main valve core damping hole 14 is installed in the flow channel c near the main valve core inlet. The high water-based liquid flows sequentially through the main valve core damping hole and the flow channel c into the main valve upper chamber near the top of the main valve seat, forming a pressure balance in the main valve seat.

[0053] followed by, Figures 3-4 This is a cross-sectional view of the pilot valve in a preferred embodiment of this application. The pilot valve includes two identical two-position three-way ball valves, namely pilot valve I and pilot valve II. Pilot valve I and pilot valve II are threaded into the pilot valve body. Pilot valve I is connected to the lower control chamber of the main valve, and pilot valve II is connected to the upper control chamber of the main valve. By controlling the pressure in the upper control chamber and the lower control chamber of the main valve, the axial movement of the main valve core in the main valve seat is controlled, thereby achieving flow regulation.

[0054] The main valve also includes a sensor push rod 9, a main valve core displacement sensor, and a main valve spring 8. One end of the sensor push rod is embedded in the top of the main valve core, and the other end of the sensor push rod is threadedly connected to the main valve core. A main valve spring adjusting nut 11 is installed on the other end of the sensor push rod, that is, a groove is opened in the part of the main valve spring adjusting nut facing the sensor push rod, and the other end of the sensor push rod is embedded in the groove. A main valve core displacement sensor is installed between the other end of the sensor push rod and the closed end of the main valve spring adjusting nut, and a main valve spring is sleeved on the outside of the structure formed by the sensor push rod and the main valve core displacement sensor.

[0055] As mentioned above, one of the advantages of this application is that the pressure in the upper chamber of the main valve and the lower chamber of the main valve is controlled by the pilot valve to achieve flow regulation. At most, four two-position two-way valves or two two-position three-way valves can be used as the pilot valves. However, considering the manufacturing cost and installation size, this application uses two two-position three-way valves to control the main valve core to quickly open and close the valve port. The response speed is very fast, and the structure is relatively compact.

[0056] Since pilot valve I and pilot valve II have the same structure, we will use them as an example here. Figure 4 Taking the structure as the subject of description, the pilot valve I or pilot valve II includes an upper pilot valve core 25, a sealing block 28, a middle pilot valve core 30, a ball valve seat 31, a ball valve core 32, a ball valve reset seat 34, and a pilot valve plug 36, which are sequentially and coaxially installed in the pilot cartridge valve body 24. A trapezoidal groove is formed on the top of the ball valve reset seat, and the ball valve core is embedded in the trapezoidal groove. A reset seat boss is provided at the bottom of the ball valve reset seat, and a plug boss is provided on the top of the pilot valve plug. One end of the ball valve reset spring 35 is inserted into the reset seat boss, and the other end of the ball valve reset spring is inserted into the plug boss. The space between the ball valve seat, the ball valve core, the ball valve reset seat, and the pilot valve plug forms a pilot inlet chamber 42. The pilot inlet chamber of pilot valve II is connected to the pilot inlet port PP through the flow channel h19, and the pilot inlet chamber of pilot valve I is connected to the pilot inlet chamber of pilot valve II through the flow channel i20.

[0057] A pilot valve sleeve 29 is fitted over the pilot valve core. The portion of the pilot valve core near the bottom is located inside the ball valve seat, and the diameter of the portion of the pilot valve core located in the pilot valve sleeve is smaller than the diameter of the portion of the pilot valve core located in the ball valve seat. An annular boss protrudes outward from the outer wall of the middle portion of the pilot valve core. The diameter of the annular boss is larger than the diameter of the central hole of the pilot valve sleeve. Here, the annular boss serves as a limiting device.

[0058] The space between the middle pilot valve sleeve, the middle pilot valve core, and the ball valve seat forms the main valve control chamber 41. The space between the upper pilot valve core, the sealing block, and the middle pilot valve sleeve forms the pilot return oil chamber 40. The middle pilot valve core has a conical structure with a hole inside, which connects the main valve control chamber and the pilot return oil chamber. The space between the top of the upper pilot valve core and the pilot cartridge valve body forms the pilot control chamber 38. The upper control chamber of the main valve is connected to the main valve control chamber of pilot valve II through flow channel b. The lower control chamber of the main valve is connected to the main valve control chamber of pilot valve I through flow channel a.

[0059] The outer part of the middle pilot valve sleeve is threadedly connected to the pilot cartridge valve body; an upper pilot valve spring 27 is sleeved on the outside of the structure formed by the upper pilot valve core, the sealing block, and the middle pilot valve core located at the top of the middle pilot valve sleeve; one end of the upper pilot valve spring is in contact with the upper pilot valve core, and the other end of the upper pilot valve spring is in contact with the middle pilot valve sleeve; the top end of the sealing block is in contact with the upper pilot valve core, and the bottom end of the sealing block is in contact with the middle pilot valve core. When the pilot does not need to supply high water-based emulsion to the main valve, the pressure in the pilot control chamber is almost zero, and the upper pilot valve core moves upward under the action of the upper pilot valve spring (here, upward movement is based on...). Figure 4 (The view angle is for illustrating the object), while separating the sealing block and the center hole of the pilot valve core.

[0060] A high-speed switching valve is coaxially inserted into the top of the pilot cartridge valve body, and the high-speed switching valve is threaded into the pilot cartridge valve body. To achieve the pilot valve's pre-control of the main valve, there must be a flow path connection between the main valve and the pilot valve. Specifically, the inlet of the high-speed switching valve is connected to the pilot control chamber via flow path k37; the outlet of the high-speed switching valve is connected to the pilot return port P via sequentially connected flow paths d15, e16, g, pilot return chamber, and f17. T When the pilot valve is not activated, the emulsion in the pilot control chamber flows back to the emulsion tank via the high-speed switching valve; the pilot oil inlet chamber is connected to the pilot control chamber via the pilot damping orifice 33, flow channel g, flow channel m39 and the pilot control chamber in sequence.

[0061] Finally, this application also provides a control method based on the aforementioned dual-active control high-pressure, high-flow, high-water-based digital throttle valve, the implementation principle of which is as follows: Figure 5 As shown, when the digital throttle valve does not require output flow, the high-speed switching valve is a normally open valve. The high water-based liquid in the pilot control chamber of pilot valve I and pilot valve II is connected to the oil inlet of the high-speed switching valve through flow channel k. Then, the high water-based liquid is connected to the pilot return port through the return port of the high-speed switching valve in sequence through flow channel d, flow channel e, flow channel j26, pilot return oil chamber and flow channel f. The pressure in the pilot control chamber of pilot valve I and pilot valve II tends to be zero.

[0062] Under the action of the upper pilot valve spring, the sealing block at the bottom of the upper pilot valve core and the middle pilot valve core are separated. The ball valve cores of both pilot valve I and pilot valve II are in the closed state. The pressure in the upper control chamber and the lower control chamber of the main valve are both zero. The pressure at the inlet of the main valve is equal to the pressure in the upper chamber of the main valve. Under the action of the main valve spring, the main valve core is in contact with the main valve seat. The displacement of the main valve core is zero, and no flow passes through.

[0063] When the output flow rate of the flow valve changes, the displacement of the main valve core is calculated based on the relationship between the flow rate and displacement at the main valve inlet. The calculated displacement signal is then converted into a PWM duty cycle signal for the high-speed switching valve. By controlling the proportion of the switching time in a single cycle of the high-speed switching valve, the pressure of the pilot control chambers of the matching pilot valve I and pilot valve II is controlled, thereby controlling the flow rate of pilot valve I and pilot valve II flowing into or out of the matching main valve control chamber.

[0064] The specific process of controlling the flow rate of pilot valves I and II into or out of the control chamber of the matching main valve is as follows:

[0065] When the required flow rate of the flow valve increases, i.e., the opening degree of the main valve core increases, the duty cycle of the high-speed switching valve of pilot valve II is changed, causing the pressure in the pilot control chamber of pilot valve II to gradually decrease. Under the action of the upper pilot valve spring, the sealing block at the bottom of the upper pilot valve core separates from the middle pilot valve core, and the ball valve core of pilot valve II is in the closed state. The emulsion in the upper chamber of the main valve control returns from the main valve control chamber of pilot valve II, the inner hole of the middle pilot valve core, and the pilot return oil chamber to the pilot return oil port, and the pressure in the upper chamber of the main valve control decreases. At the same time, by changing the high-speed switching valve of pilot valve I... The duty cycle of the quick-start valve causes the pressure in the pilot control chamber of pilot valve I to gradually increase. Under the action of the pilot control chamber pressure, the upper pilot valve core moves axially towards the pilot valve plug. The sealing block installed on the upper pilot valve core blocks the flow channel of the middle pilot valve core, isolating the main valve control chamber and the pilot return oil chamber. Under the action of the upper pilot valve core, the middle pilot valve core continues to move axially towards the pilot valve plug, increasing the opening of the ball valve core. The pressure in the lower chamber of the main valve control increases, and under the pressure difference generated, the opening of the main valve core increases, and the output flow of the main valve increases.

[0066] When the required flow rate of the flow valve decreases, i.e., the opening degree of the main valve core decreases, the duty cycle of the high-speed switching valve of pilot valve I is changed, causing the pressure in the pilot control chamber of pilot valve I to gradually decrease. Under the action of the upper pilot valve spring, the sealing block at the bottom of the upper pilot valve core separates from the middle pilot valve core, and the ball valve core of pilot valve I is in the closed state. The emulsion in the upper chamber of the main valve control returns from the main valve control chamber of pilot valve I, the inner hole of the middle pilot valve core, and the pilot return oil chamber to the pilot return oil port, and the pressure in the lower chamber of the main valve control decreases. At the same time, the high-speed switching valve of pilot valve II is changed... The duty cycle of the closed valve causes the pressure in the pilot control chamber of pilot valve II to gradually increase. Under the action of the pilot control chamber pressure, the upper pilot valve core moves axially towards the pilot valve plug. The sealing block installed on the upper pilot valve core blocks the flow channel of the middle pilot valve core, isolating the main valve control chamber and the pilot return oil chamber. Under the action of the upper pilot valve core, the middle pilot valve core continues to move axially towards the pilot valve plug, increasing the opening of the ball valve core. The pressure in the upper control chamber of the main valve increases, and under the pressure difference generated, the opening of the main valve core decreases, and the output flow of the main valve decreases.

[0067] The main valve core displacement signal measured by the main valve core displacement sensor is compared with the expected main valve core displacement signal, and the error signal is input to the controller to control the displacement of the main valve core.

[0068] In summary, the digital throttle valve provided in this application adopts a cartridge structure for its main valve, pilot valve, and pilot valve drive, which is compact, well-sealed, and easy to install; the pilot valve adopts a two-position three-ball valve with fast response speed, which can quickly adjust the flow required by the system; at the same time, it uses a high-speed switching valve as the drive, with large output force and no need to introduce mechanical structures such as levers or ball screws.

[0069] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0070] The meaning of "and / or" as used in this application includes situations where each exists alone or both exist simultaneously.

[0071] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0072] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dual-active control high-pressure, high-flow, high-water-based digital throttling valve, characterized in that: Includes the main valve and the pilot valve (12). The main valve includes a main valve core (1) and a main valve seat (2). The main valve core (1) is coaxially arranged inside the main valve seat (2). The inlet of the main valve core (1) is a cone valve structure. A boss is formed by protruding outward on the circumferential wall of the main valve core (1) near the outlet. The boss divides the chamber inside the main valve seat (2) into the upper chamber (5) of the main valve control and the lower chamber (4) of the main valve control. In the direction from the inlet to the outlet of the main valve core on the central axis of the main valve, the upper chamber (5) of the main valve control is located at the top of the lower chamber (4) of the main valve control. A flow channel c (13) is opened at the axial position of the main valve core. The main valve core damping hole (14) is installed near the inlet of the main valve core (1) in the flow channel c (13). The high water base liquid flows into the main valve upper cavity near the top of the main valve seat (2) through the main valve core damping hole (14) and the flow channel c (13) in sequence, forming a pressure balance in the main valve seat (2). The pilot valve (12) includes two identical two-position three-way ball valves, namely pilot valve I (21) and pilot valve II (22). The pilot valve I (21) and pilot valve II (22) are threaded into the pilot valve body. Pilot valve I (21) is connected to the lower chamber (4) of the main valve control, and pilot valve II (22) is connected to the upper chamber (5) of the main valve control. By controlling the pressure of the upper chamber (5) and the lower chamber (4) of the main valve control, the axial movement of the main valve core (1) in the main valve seat (2) is controlled, thereby achieving flow regulation. The pilot valve I (21) or pilot valve II (22) includes an upper pilot valve core (25), a sealing block (28), a middle pilot valve core (30), a ball valve seat (31), a ball valve core (32), a ball valve reset seat (34), and a pilot valve plug (36) that are sequentially and coaxially installed in the pilot cartridge valve body (24). The sealing block (28) can block the flow channel of the middle pilot valve core (25). A trapezoidal groove is opened on the top of the ball valve reset seat (34), the ball valve core (32) is embedded in the trapezoidal groove, a reset seat boss is provided at the bottom of the ball valve reset seat (34), a screw plug boss is provided on the top of the pilot valve screw plug (33), one end of the ball valve reset spring (35) is inserted into the reset seat boss, and the other end of the ball valve reset spring (35) is inserted into the screw plug boss. The space between the ball valve seat (31), the ball valve core (32), the ball valve reset seat (34), and the pilot valve plug (36) forms a pilot oil inlet chamber (42). The pilot inlet chamber (42) of pilot valve II (22) is connected to the pilot inlet port through flow channel h (19), and the pilot inlet chamber (42) of pilot valve I (21) is connected to the pilot inlet chamber (42) of pilot valve II (22) through flow channel i (20); A middle pilot valve sleeve (29) is fitted outside the middle pilot valve core (30). The space between the middle pilot valve sleeve (29), the middle pilot valve core (30), and the ball valve seat (31) forms the main valve control chamber (41). The space between the upper pilot valve core (25), the sealing block (28), and the middle pilot valve sleeve (29) forms the pilot return oil chamber (40). The middle pilot valve core (30) has a conical structure and a hole inside it. The hole connects the main valve control chamber (41) and the pilot return oil chamber (40). The space between the top of the upper pilot valve core (25) and the pilot cartridge valve body (24) forms a pilot control chamber (38); The main valve control chamber (5) is connected to the main valve control chamber (41) of the pilot valve II (22) through the flow channel b (7); The main valve control chamber (4) is connected to the main valve control chamber (41) of the pilot valve I (21) through the flow channel a (6).

2. The dual-active control high-pressure, high-flow, high-water-based digital throttling valve according to claim 1, characterized in that: The main valve also includes a sensor push rod (9), a main valve core displacement sensor (10), and a main valve spring (8). One end of the sensor push rod (9) is embedded in the top of the main valve core (1), and the other end of the sensor push rod (9) is threadedly connected to the main valve core (1). A main valve spring adjusting nut (11) is installed on the other end of the sensor push rod (9), that is, a groove is opened in the part of the main valve spring adjusting nut (11) facing the sensor push rod, and the other end of the sensor push rod (9) is embedded in the groove; A main valve core displacement sensor (10) is set between the other end of the sensor push rod (9) and the closed end of the main valve spring adjusting nut (11), and a main valve spring (8) is sleeved on the outside of the structure formed by the sensor push rod (9) and the main valve core displacement sensor (10).

3. The dual-active control high-pressure, high-flow, high-water-based digital throttling valve according to claim 1, characterized in that: The portion of the middle pilot valve core (30) near the bottom is located inside the ball valve seat (31), and the diameter of the portion of the middle pilot valve core (30) located in the middle pilot valve sleeve (29) is greater than the diameter of the portion of the middle pilot valve core (30) located in the ball valve seat (31); An annular boss is formed by protruding outward from the outer wall of the middle part of the pilot valve core (30). The diameter of the annular boss is larger than the diameter of the central hole of the pilot valve sleeve (29).

4. The dual-active control high-pressure, high-flow, high-water-based digital throttling valve according to claim 1, characterized in that: The outer side of the middle pilot valve sleeve (29) is threadedly connected to the pilot cartridge valve body (24); the upper pilot valve spring (27) is sleeved on the outside of the structure formed by the upper pilot valve core (25), the sealing block (28) and the middle pilot valve core (30) located at the top of the middle pilot valve sleeve (29). One end of the upper pilot valve spring (27) is in contact with the upper pilot valve core (25), and the other end of the upper pilot valve spring (27) is in contact with the middle pilot valve sleeve (29); The top of the sealing block (28) is attached to the upper pilot valve core (25), and the bottom of the sealing block (28) is attached to the middle pilot valve core (30).

5. The dual-active control high-pressure, high-flow, high-water-based digital throttling valve according to claim 4, characterized in that: A high-speed switching valve (23) is coaxially inserted into the top of the pilot cartridge valve body (24), and the high-speed switching valve (23) is threadedly connected inside the pilot cartridge valve body (24).

6. The dual-active control high-pressure, high-flow, high-water-based digital throttling valve according to claim 5, characterized in that: The oil inlet of the high-speed switching valve (23) is connected to the pilot control chamber (38) through the flow channel k (37); The oil outlet of the high-speed switching valve (23) is connected to the pilot return port through sequentially connected flow channels d (15), e (16), g (18), pilot return oil chamber (40), and f (17); The pilot oil inlet chamber (42) is connected by a pilot damping hole (33), flow channel j (26), flow channel m (39) and pilot control chamber (38) connected in sequence.

7. A control method for a dual-active control high-pressure, high-flow, high-water-based digital throttle valve as described in claim 6, characterized in that: When the digital throttle valve does not need to output flow, the high-speed switching valve (23) is a normally open valve. The high water-based liquid in the pilot control chamber (38) of the pilot valve I (21) and the pilot valve II (22) is connected to the oil inlet of the high-speed switching valve (23) through the flow channel k (37). Then, the high water-based liquid is connected to the pilot return port through the return port of the high-speed switching valve (23) in sequence through the flow channel d (15), the flow channel e (16), the flow channel g (18), the pilot return oil chamber (40) and the flow channel f (17). The pressure in the pilot control chamber (38) of the pilot valve I (21) and the pilot valve II (22) tends to be zero. Under the action of the upper pilot valve spring (27), the sealing block (28) at the bottom of the upper pilot valve core (25) and the middle pilot valve core (30) are separated. The ball valve cores (32) of the pilot valve I (21) and the pilot valve II (22) are both in the closed state. The pressure in the upper chamber (5) and the lower chamber (4) of the main valve control is zero. The pressure at the inlet of the main valve is equal to the pressure in the upper chamber of the main valve. Under the action of the main valve spring (8), the main valve core (1) is in contact with the main valve seat (2). The displacement of the main valve core (1) is zero, and no flow passes through. When the output flow rate of the flow valve changes, the displacement of the main valve core (1) is calculated based on the relationship between the flow rate and displacement at the main valve inlet. The calculated displacement signal is then converted into the PWM duty cycle signal of the high-speed switching valve (23). By controlling the proportion of the switching time in a single cycle of the high-speed switching valve (23), the pressure of the pilot control chamber (38) of the matching pilot valve I (21) and pilot valve II (22) is controlled, thereby controlling the flow rate of pilot valve I (21) and pilot valve II (22) flowing into or out of the matching main valve control chamber (41).

8. The control method for the dual-active control high-pressure, high-flow, high-water-based digital throttle valve according to claim 7, characterized in that: The specific process of controlling the flow of pilot valve I (21) and pilot valve II (22) into or out of the matching main valve control chamber (41) is as follows: When the required flow rate of the flow valve increases, i.e., the opening of the main valve core increases, the pressure in the pilot control chamber (38) of the pilot valve II (22) gradually decreases by changing the duty cycle of the high-speed switching valve of the pilot valve II (22). Under the action of the upper pilot valve spring (27), the sealing block (28) at the bottom of the upper pilot valve core (25) and the middle pilot valve core (30) separate, the ball valve core of the pilot valve II (22) is in the closed state, and the emulsion in the upper chamber (5) of the main valve control returns to the pilot return port from the main valve control chamber (41) of the pilot valve II (22), the inner hole of the middle pilot valve core (31) and the pilot return oil chamber (40), and the pressure in the upper chamber (5) of the main valve control decreases; at the same time, by changing the high-speed switching valve of the pilot valve I (21) The duty cycle of the fast-switching valve causes the pressure in the pilot control chamber (38) of the pilot valve I (21) to gradually increase. Under the action of the pressure in the pilot control chamber (38), the upper pilot valve core (25) moves axially toward the pilot valve plug (36). The sealing block (28) installed on the upper pilot valve core (25) blocks the flow channel of the middle pilot valve core (25), thus isolating the main valve control chamber (41) and the pilot return oil chamber (40). Under the action of the upper pilot valve core (25), the middle pilot valve core (30) continues to move axially toward the pilot valve plug (36), increasing the opening of the ball valve core (32). The pressure in the lower chamber of the main valve control chamber increases, and under the pressure difference generated, the opening of the main valve core (1) increases, and the flow rate output by the main valve increases. When the flow rate required by the flow valve decreases, i.e., the opening of the main valve core decreases, the pressure in the pilot control chamber (38) of the pilot valve I (22) gradually decreases by changing the duty cycle of the high-speed switching valve of the pilot valve I (21). Under the action of the upper pilot valve spring (27), the sealing block (28) at the bottom of the upper pilot valve core (25) and the middle pilot valve core (30) separate, and the ball valve core of the pilot valve I (21) is in the closed state. The emulsion in the upper chamber (5) of the main valve control returns from the main valve control chamber (41) of the pilot valve I (21), the inner hole of the middle pilot valve core (31) and the pilot return oil chamber (40) to the pilot return oil port, and the pressure in the lower chamber of the main valve control decreases. At the same time, the pressure in the pilot control chamber (38) of the pilot valve II (22) gradually increases by changing the duty cycle of the high-speed switching valve of the pilot valve II (22). Under the pressure of the pilot control chamber (38), the upper pilot valve core (25) moves axially toward the pilot valve plug (36). The sealing block (28) installed on the upper pilot valve core (25) blocks the flow channel of the middle pilot valve core (25), thus isolating the main valve control chamber (41) and the pilot return oil chamber (40). Under the action of the upper pilot valve core (25), the middle pilot valve core (30) continues to move axially toward the pilot valve plug (36), increasing the opening of the ball valve core (32). The pressure in the upper chamber of the main valve control chamber increases, and under the pressure difference generated, the opening of the main valve core (1) decreases, and the flow rate output by the main valve decreases. The main valve core displacement signal measured by the main valve core displacement sensor (10) is compared with the expected main valve core displacement signal, and the error signal is input to the controller to feed back and control the displacement of the main valve core (1).

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