High-pressure large-flow high-water-based plug-in digital throttle valve and control method

Abstract

The application relates to a high-pressure large-flow high-water-base plug-in digital throttling valve and a control method, which comprises a main valve and a pilot valve, wherein the main valve adopts a symmetrical cylinder structure and has two symmetrical control cavities; the pilot valve adopts a pair of two-position two-way plug-in normally-closed ball valve structures; each pilot ball valve is driven by a normally-open high-speed on-off valve; the flow of the pilot valve into or out of the lower control cavity of the main valve is controlled by a PWM signal; the pressure of the lower control cavity of the main valve is controlled; the spring force of the main valve is overcome; the main valve core is driven to move; and the displacement sensor is used to realize closed-loop accurate control of the displacement of the main valve; the main valve is a spool valve; the pilot valve and the drive are ball valves; the seal is good under high-water-base or pure water medium, and there is no leakage; the pilot valve adopts two two-position two-way valve structures, which are simple, easy to process, assemble and control; the high-speed on-off valve is used as the drive, the price is low, the anti-pollution capacity is high, the output force is large, and mechanical structures such as levers or ball screws need not be introduced.

Description

TECHNICAL FIELD

[0001] The application relates to a high-pressure large-flow high-water-base plug-in digital throttle valve and a control method, and belongs to the field of water pressure elements. BACKGROUND

[0002] Current flow valves are mostly slide valves with high cost, poor anti-pollution ability, and are difficult to meet the requirements of high pressure and large flow, and are seriously leaked in pure water and high water base working conditions. Since the plug-in valve has the characteristics of simple structure, less leakage, large flow capacity and good versatility, it is widely used in high-pressure and large-flow fields such as casting and forging metallurgy and mining.

[0003] The current plug-in flow valve still has some deficiencies: the plug-in flow servo valve driven by the motor (CN103291678B) can meet the occasion of high pressure and large flow, but the pilot valve will produce serious leakage in the working condition of pure water; the plug-in water pressure digital throttle valve (CN114593100A) with independent load port control adopts a step motor plus a ball screw for driving, resulting in a complex structure, introducing more nonlinear factors, and dead zone and zero drift caused by friction and wear.

[0004] That is, the flow valve in the prior art has a pilot part and a problem of driving the pilot part, and the application proposes a high-pressure large-flow high-water-base digital throttle valve driven by a high-speed on-off valve and two two-position two-way ball valves, which not only has a simple structure, small leakage, strong anti-pollution ability, but also can meet the working condition of high pressure, large flow and high water base. SUMMARY

[0005] The application provides a high-pressure large-flow high-water-base plug-in digital throttle valve and a control method, which has a simple structure, small leakage, rapid response and strong anti-pollution ability, and can meet the working condition of high pressure and large flow.

[0006] The technical scheme adopted by the application to solve the technical problem is:

[0007] A high-pressure large-flow high-water-base plug-in digital throttle valve, comprising a main valve and a pilot valve, the main valve comprising a main valve core and a main valve seat, the main valve core being embedded in the main valve seat and coaxially arranged; a flow channel c is formed on the central axis of the main valve core, a main valve core damping hole is installed near the inlet of the flow channel c, a main valve push rod is installed at the outlet of the flow channel c, one end of the main valve push rod is connected with the top of the main valve core, the other end of the main valve push rod is externally covered with a main valve spring adjusting nut, and a main valve spring is sleeved on the main valve push rod between the main valve spring adjusting nut and the top of the main valve core.

[0008] The circular wall of the main valve core near the top position is outwardly convex to form a boss, and the chamber between the main valve core and the main valve seat is divided into a main valve control lower chamber and a main valve control upper chamber by the boss in the direction from the inlet of the flow passage c to the outlet of the flow passage c, and the high water-based liquid flows into the main valve upper chamber through the main valve core damping hole, the flow passage c and the main valve push rod from the inlet of the main valve core, so as to realize pressure balance with the main valve core;

[0009] The pilot valve body is communicated with the main valve, the pilot valve controls the pressure of the main valve control lower chamber, overcomes the main valve spring force, and then controls the axial displacement of the main valve core in the main valve seat, so as to realize the adjustment of the main valve output flow;

[0010] As a further preferred embodiment of the present application, a groove is formed in the portion of the main valve spring adjusting nut towards the other end of the main valve push rod, the other end of the main valve push rod is embedded in the groove, and a main valve core displacement sensor is further arranged between the other end of the main valve push rod and the groove, and the main valve core displacement sensor is connected with the main valve spring adjusting nut through threads; the one end of the main valve push rod is connected with the top of the main valve core through threads;

[0011] As a further preferred embodiment of the present application, the pilot valve comprises two two-position two-way cartridge ball valves with the same structure, namely pilot valve I and pilot valve II, and the pilot valve I and the pilot valve II are inserted into the pilot valve body through threads;

[0012] The pilot valve I or the pilot valve II comprises a coaxially arranged high-speed on-off valve, an upper pilot valve core, an upper pilot valve spring, a ball valve seat, a ball valve core, a ball valve reset seat, a ball valve reset spring, a pilot cartridge valve body and a pilot valve plug;

[0013] The upper pilot valve core is coaxially installed in the pilot cartridge valve body, the ball valve seat and the pilot valve plug are connected with the pilot cartridge valve body through threads in the space between the bottom end of the upper pilot valve core and the bottom of the pilot cartridge valve body, a boss is coaxially arranged at the bottom of the ball valve reset seat, the ball valve reset spring is embedded in the boss, and the ball valve reset spring is coaxially arranged with the boss; the ball valve reset seat is slidably installed at the top of the pilot valve plug, the ball valve core is installed at the top end of the ball valve reset seat, and the ball valve core can roll on the top of the ball valve reset seat, and the ball valve reset seat is abutted on the conical surface of the ball valve seat under the action of the ball valve reset spring, and a linear seal is formed;

[0014] The space where the ball valve seat, the ball valve core, the ball valve reset seat and the pilot valve plug are located forms a pilot oil inlet chamber;

[0015] As a further preferred embodiment of the present application, a trapezoidal groove is formed at the top of the ball valve reset seat, and the ball valve core is embedded in the trapezoidal groove;

[0016] As a further preferred embodiment of the present application, the middle circumferential wall of the upper pilot spool protrudes outward to form an annular platform, the diameter of the annular platform is larger than the diameter of the central hole of the upper pilot cartridge, one end of the upper pilot spring is sleeved on the bottom end of the upper pilot spool, that is, the top end of the upper pilot spring is attached to the bottom surface of the annular platform of the upper pilot spool, and the other end of the upper pilot spring is attached to the top of the ball valve seat;

[0017] In the upper pilot cartridge, the space where the upper pilot spool and the upper pilot spring are located forms a main valve control chamber;

[0018] As a further preferred embodiment of the present application, the space between the top of the upper pilot spool and the upper pilot cartridge forms a pilot control chamber in the upper pilot cartridge;

[0019] A high-speed on-off valve is installed on the top of the upper pilot cartridge, and the oil inlet of the high-speed on-off valve is in communication with the pilot control chamber;

[0020] As a further preferred embodiment of the present application, the pilot inlet of the pilot valve II is connected to the pilot inlet chamber of the pilot valve II through the flow channel e;

[0021] The main valve control chamber of the pilot valve II is connected to one end of the flow channel d, and the other end of the flow channel d is connected to the inlet chamber of the pilot valve I;

[0022] In the pilot valve II, the pilot control chamber is connected to the pilot inlet chamber through the pilot damping hole I and the flow channel i; in the pilot valve I, the pilot control chamber is connected to the pilot inlet chamber of the pilot valve II through the flow channel h, the pilot damping hole II, and the flow channel j;

[0023] The main valve control chamber of the pilot valve II is connected to the main valve control lower chamber through the flow channel a; one end of the main valve control chamber of the pilot valve I is connected to the main valve control upper chamber through the flow channel b, and the other end is connected to the pilot return port through the flow channel f;

[0024] The return port of the high-speed on-off valve of the pilot valve I and the return port of the high-speed on-off valve of the pilot valve II are sequentially connected to the pilot return port through the flow channel g and the flow channel f;

[0025] A control method based on the high-pressure large-flow high-water-based cartridge digital throttling valve, when the digital throttling valve is in a no-flow output state, the high-speed on-off valves of the pilot valve I and the pilot valve II are always open, the high-water-based emulsion in the pilot control chamber flows back to the emulsion tank through the high-speed on-off valve, the ball spool is pressed against the ball valve seat under the action of the ball valve return spring, and the pilot valve I and the pilot valve II are in a closed state;

[0026] The pressures of the main valve control upper chamber and the main valve control lower chamber are both zero, the main spool is attached to the main valve seat under the action of the main valve spring, and the displacement of the main spool is zero;

[0027] As a further preferred embodiment of the present application,

[0028] When the digital throttle valve needs to output emulsion, according to the relationship between the valve port flow and displacement, the displacement of the main valve core opening is calculated, and the displacement signal is converted into the duty cycle signal of the high-speed on-off valve of the pilot valve I and the pilot valve II, the pressure of the pilot control chamber of the pilot valve I and the pilot valve II is controlled by controlling the proportion of the switching time in a single cycle of the high-speed on-off valve, and the pilot valve core moves along the central axis to the ball valve core under the action of the pilot control chamber pressure, pushes away the ball valve core, and the emulsion flows from the pilot inlet chamber of the pilot valve II through the main valve control chamber, part of which flows into the main valve control lower chamber, and the other part flows back to the emulsion tank through the flow channel d, the pilot inlet chamber of the pilot valve I, the main valve control chamber and the flow channel f;

[0029] The amount of emulsion flowing into the main valve control lower chamber of the pilot valve II is controlled by controlling the duty cycle of the high-speed on-off valve of the pilot valve II, the amount of emulsion flowing out of the main valve control lower chamber of the pilot valve I is controlled by controlling the duty cycle of the high-speed on-off valve of the pilot valve I, the amount of emulsion actually flowing into the matching main valve control lower chamber is controlled by controlling the duty cycle of the two high-speed on-off valves respectively, and the pressure of the matching main valve control lower chamber is controlled, and under the action of the pressure, the main valve core moves along the central axis to the main valve push rod direction;

[0030] At this time, 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 accurately control the displacement of the main valve core;

[0031] As a further preferred embodiment of the application,

[0032] When the flow of the digital throttle valve increases or decreases, the duty cycles of the high-speed on-off valves of the pilot valve I and the pilot valve II are changed respectively, the opening of the ball valve core of the pilot valve I and the pilot valve II is adjusted, and the pressure of the main valve control lower chamber is controlled, so that the main valve core moves along the central axis direction, and the purpose of controlling the displacement of the main valve is achieved.

[0033] Through the above technical scheme, compared with the prior art, the application has the following beneficial effects:

[0034] 1、The high-pressure large-flow high-water-based cartridge digital throttle valve provided by the application has a conical valve structure for the main valve, and ball valve structures for the pilot valve and the high-speed on-off valve, can be sealed well in a high-water-based or pure water medium, and has no leakage;

[0035] 2、The high-pressure large-flow high-water-based cartridge digital throttle valve provided by the application uses a high-speed on-off valve as a drive, is cheap, has large pilot output force, does not need to introduce a lever or a ball screw and other mechanical structures, avoids introducing more nonlinear factors, and avoids problems such as zero drift caused by friction and wear;

[0036] 3. The high-pressure large-flow high-water-based cartridge digital throttling valve provided by the application has a cartridge structure for the main valve, the pilot valve and the pilot valve drive, has large output flow, compact structure, good sealing and easy installation;

[0037] 4. The high-pressure large-flow high-water-based cartridge digital throttling valve provided by the application has a two-position two-way valve structure for the pilot valve, which is simple, easy to process and assemble, has simple control algorithm and low cost;

[0038] 5. The high-pressure large-flow high-water-based cartridge digital throttling valve provided by the application has a two-position two-way valve structure for the pilot valve, which is simple, easy to process and assemble, has simple control algorithm and low cost; BRIEF DESCRIPTION OF DRAWINGS

[0039] The application will be further described below in combination with the drawings and examples.

[0040] Figure 1 is a hydraulic principle diagram of the preferred embodiment provided by the application;

[0041] Figure 2 is a partial sectional view of the overall structure front view provided by the application;

[0042] Figure 3 is an A-A sectional view of the overall structure provided by the application; Figure 2

[0043] Figure 4 is a B-B sectional view of the pilot valve provided by the application; Figure 3

[0044] Figure 5 is a C-C sectional view of the pilot valve provided by the application; Figure 3

[0045] is a process schematic diagram of the pilot valve being opened provided by the application Figure 6

[0046] Figure 7 is a principle diagram of the control method provided by the application.

[0047] ​​​In the figure: 1 is the main valve core, 2 is the main valve seat, 3 is the main valve body, 4 is the main valve control lower cavity, 5 is the main valve control upper cavity, 6 is the flow channel a, 7 is the flow channel b, 8 is the main valve spring, 9 is the main valve 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 the flow channel c, 14 is the main valve core damping hole, 15 is the pilot valve I, 16 is the pilot valve II, 17 is the flow channel d, 18 is the flow channel e, 19 is the flow channel f, 20 is the pilot valve body, 21 is the flow channel g, 22 is the high-speed on-off valve, 23 is the pilot control cavity, 24 is the upper pilot valve core, 25 is the upper pilot valve spring, 26 is the main valve control cavity, 27 is the ball valve seat, 28 is the ball valve core, 29 is the pilot inlet cavity, 30 is the ball valve reset seat, 31 is the ball valve reset spring, 32 is the pilot cartridge valve body, 33 is the pilot valve screw plug, 34 is the flow channel h, 35 is the pilot damping hole I, 36 is the flow channel i, 37 is the pilot damping hole II, 38 is the flow channel j. DETAILED DESCRIPTION

[0048] The application will be further described in detail with reference to the drawings. In the description of the present application, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, and therefore cannot be understood as a limitation on the present application. The specific dimensions used in the embodiments are only for the purpose of illustrating the technical solutions and do not limit the protection scope of the present application.

[0049] In the background art, the applicant points out that the current flow valve is mainly a slide valve with the disadvantage of the valve core, because the traditional hydraulic system using mineral oil as the medium has the problems of pollution and flammability, so water hydraulic is gradually used instead of oil hydraulic in the fields of food processing, seawater desalination, metallurgy, coal mine and the like. However, the viscosity of water medium is lower than that of mineral oil, and it is easy to leak, so the control valve can only use the structure of ball valve and cone valve, and if a slide valve is used, there will be a serious leakage problem, and the flow valve cannot work. Therefore, the primary problem to be solved by the present application is to control the leakage of the main valve.

[0050] Secondly, since it is difficult to directly control the main valve in the hydraulic system due to the need for a very large force, direct driving cannot be achieved, so the power is amplified by setting a pilot valve, and the amplified power is used to drive the main valve. Therefore, the setting of the pilot valve is also very important, and the present application is to solve the problem of selecting a suitable pilot valve under the premise of no leakage to facilitate operation and control.

[0051] For the first problem, the main valve of the present application adopts a symmetrical cylinder cartridge structure, i.e. Figure 1The hydraulic schematic diagram provided by the present application is a cone valve with two symmetrical control cavities. The valve can be used in a water hydraulic system due to its good sealing performance. Figure 1 The pilot valve 12 used in the present application is two two-position normally open ball valves. The flow rate and pressure of the lower cavity 4 are controlled by the main valve to achieve the purpose of controlling the displacement of the main valve.

[0052] It is worth noting that why two two-position normally open ball valves are used. Normally, the maximum number of pilot valves is four two-position two-way valves (or two two-position three-way valves, which are equivalent in principle). Two valves are used to control the upper cavity 5 of the main valve, and two valves are used to control the lower cavity of the main valve, so that the valve core of the main valve can quickly open and close the valve port. Although the response is fast, there are some disadvantages, such as complex structure, high cost, and difficult control. The ingenious part of the present application is that two two-position two-way valves are used to directly control the lower cavity of the main valve and the spring force 8 of the main valve to achieve the control of the main valve. This design method makes the structure of the valve simple, easy to control, and greatly simplifies the processing and assembly.

[0053] Next, the preferred embodiment provided by the present application will be described in detail, Figure 2 is the front view of the entire digital throttling valve, including the main valve and the 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 embedded in the main valve seat, and the two are coaxially arranged. A flow passage c13 is formed on the central axis of the main valve core. A main valve core damping hole 14 is installed near the inlet of the flow passage c. A main valve push rod 9 is installed at the outlet of the flow passage c, that is, one end of the main valve push rod is connected to the top of the main valve core, and the other end of the main valve push rod is externally covered with a main valve spring adjusting nut 11. A main valve spring is sleeved on the main valve push rod between the main valve spring adjusting nut and the top of the main valve core.

[0054] A boss is formed on the circumferential wall of the main valve core near the top position, which divides the cavity between the main valve core and the main valve seat into a main valve control lower cavity and a main valve control upper cavity in the direction from the inlet of the flow passage c to the outlet of the flow passage c. The high water-based liquid flows into the main valve upper cavity through the main valve core damping hole, the flow passage c, and the main valve push rod from the inlet of the main valve core, achieving pressure balance with the main valve core. The pilot valve body communicates with the main valve. The pilot valve controls the pressure of the main valve control lower cavity, overcomes the force of the main valve spring, and then controls the axial displacement of the main valve core in the main valve seat to achieve flow regulation.

[0055] In the main valve, the main valve spring adjusting nut is provided with a groove at the portion towards the other end of the main valve push rod, the other end of the main valve push rod is embedded in the groove, a main valve core displacement sensor is further arranged between the other end of the main valve push rod and the groove, and the main valve core displacement sensor is connected with the main valve spring adjusting nut through threads; the one end of the main valve push rod is connected with the top of the main valve core through threads.

[0056] Figure 3 As can be clearly seen, the pilot valve comprises two two-position two-way plug-in ball valves with the same structure, namely, a pilot valve I 15 and a pilot valve II 16, and the pilot valve I and the pilot valve II are plugged into the pilot valve body 20 through threads. Figure 4 As shown, the pilot valve I or the pilot valve II comprises a high-speed on-off valve 22, an upper pilot valve core 24, an upper pilot valve spring 25, a ball valve seat 27, a ball valve core 28, a ball valve return seat 30, a ball valve return spring 31, a pilot plug-in valve body 32 and a pilot valve plug 33 which are coaxially arranged; the upper pilot valve core is coaxially installed in the pilot plug-in valve body, the ball valve seat and the pilot valve plug are connected with the pilot plug-in valve body through threads in the space between the bottom end of the upper pilot valve core and the bottom of the pilot plug-in valve body, a boss is coaxially arranged at the bottom of the ball valve return seat, the ball valve return spring is embedded in the boss, and the ball valve return spring is coaxially arranged with the boss; the ball valve return seat is slidably installed at the top of the pilot valve plug, a trapezoidal groove is formed at the top of the ball valve return seat, the ball valve core is embedded in the trapezoidal groove, and the ball valve core can roll on the top of the ball valve return seat, the ball valve return seat is abutted against the conical surface of the ball valve seat under the action of the ball valve return spring, and a linear seal is formed; the space formed by the ball valve seat, the ball valve core, the ball valve return seat and the pilot valve plug forms a pilot oil inlet cavity 29.

[0057] The middle circumferential wall of the upper pilot valve core protrudes outward to form an annular table, the diameter of the annular table is greater than the diameter of the central hole of the pilot plug-in valve body, and the annular table can limit the upper pilot valve core; one end of the upper pilot valve spring is sleeved with the bottom end of the upper pilot valve core, that is, the top end of the upper pilot valve spring is attached to the bottom surface of the annular table of the upper pilot valve core, and the other end of the upper pilot valve spring is attached to the top of the ball valve seat; in the pilot plug-in valve body, the space formed by the upper pilot valve core and the upper pilot valve spring forms a main valve control cavity 26, and here the main valve control cavity formed in the pilot valve is communicated with a main valve control lower cavity to control the pressure of the main valve control lower cavity.

[0058] In the pilot plug-in valve body, the space between the top of the upper pilot valve core and the pilot plug-in valve body forms a pilot control cavity 23;

[0059] A high-speed switching valve is installed on the top of the pilot cartridge valve body, and the oil inlet of the high-speed switching valve is connected to the pilot control chamber. Here, it is necessary to explain why a high-speed switching valve is used as the drive in this application. First, it is important to know that the valve core moves up and down and is a linear motion. For this, there are three main existing drive solutions: stepper motor or servo motor + ball screw or nut pair (the motor outputs rotational motion, which is then converted into linear motion by the screw or nut to drive the valve core); voice coil motor with lever amplification mechanism to directly drive the pilot valve core (the motor can directly output linear motion without the need for a rotation-to-linear mechanism); or control with a high-speed switching valve (displacement control is achieved by controlling the pressure in the upper chamber of the valve core). The first two solutions have a major problem: they are very expensive. Voice coil motors typically cost over 10,000 yuan, and motors and ball screws typically cost over 2,000 yuan. Furthermore, the introduction of mechanical mechanisms such as levers / ball screws increases nonlinearity, dead zones, and zero-point drift due to friction and wear. Increased inertia also leads to phase lag, and the motor suffers from step loss. In contrast, high-speed switching valves cost only around 500 yuan, significantly reducing costs. High-speed switching valves are a type of digital valve, 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, they are always limited by low pressure and low flow rate, and are therefore often used as pilot valves for high-flow-rate valves.

[0060] Figure 3 , Figure 4 Combination Figure 5 As shown, the flow relationship between pilot valve I, pilot valve II, and the main valve is as follows: Pilot inlet P p The pilot valve is connected to the pilot inlet chamber of pilot valve II via flow channel e18; the main valve control chamber of pilot valve II is connected to one end of flow channel d17, while the other end of flow channel d17 is connected to the inlet chamber of pilot valve I; within pilot valve II, the pilot control chamber is connected to the pilot inlet chamber via pilot damping orifice I35 and flow channel i36; within pilot valve I, the pilot control chamber is connected to the pilot inlet chamber of pilot valve II via flow channel h34, pilot damping orifice II37, and flow channel j38; the main valve control chamber of pilot valve II is connected to the lower control chamber of the main valve via flow channel a6; one end of the main valve control chamber of pilot valve I is connected to the upper control chamber of the main valve via flow channel b7, and the other end is connected to the pilot return port P via flow channel f19. T Connected; the return port of pilot valve I high-speed switching valve and the return port of pilot valve II high-speed switching valve both sequentially pass through flow channel g21, flow channel f and pilot return port P. T Connected.

[0061] Finally, this application provides a control method based on the aforementioned high-pressure, high-flow, high-water-based cartridge digital throttle valve. When the digital throttle valve is in a state of no flow output, the high-speed switching valves of pilot valve I and pilot valve II are normally open. The high-water-based emulsion in the pilot control chamber flows back to the emulsion tank through the high-speed switching valve. The ball valve core is pressed against the ball valve seat under the action of the ball valve return spring, and pilot valve I and pilot valve II are in a closed state. The pressure in the upper control chamber and the lower control chamber of the main valve are both zero. The main valve core is in contact with the main valve seat under the action of the main valve spring, and the displacement of the main valve core is zero.

[0062] Figure 7 This is the core principle diagram of the control method in this application. When the digital throttle valve is in the position where emulsion needs to be output, the displacement of the main valve core opening is calculated according to the relationship between the valve port flow and displacement. The displacement signal is converted into the duty cycle signal of the high-speed switching valves of pilot valve I and pilot valve II. By controlling the proportion of the switching time in a single cycle of the high-speed switching valve, the pressure of the pilot control chamber of pilot valve I and pilot valve II is controlled. Under the action of the pilot control chamber pressure, the upper pilot valve core moves along the central axis towards the ball valve core, pushing the ball valve core open. The emulsion flows from the pilot oil inlet chamber of pilot valve II through the main valve control chamber. Part of it flows into the lower control chamber of the main valve, and the other part flows back to the pilot return port through the flow channel d, the pilot oil inlet chamber of pilot valve I, the main valve control chamber, and the flow channel f, that is, back to the emulsion tank.

[0063] The amount of emulsion flowing into the lower chamber of the main valve is controlled by adjusting the duty cycle of the high-speed switching valve of pilot valve II, and the amount of emulsion flowing out of the lower chamber of the main valve is controlled by adjusting the duty cycle of the high-speed switching valve of pilot valve I. By controlling the duty cycles of the two high-speed switching valves respectively, the actual amount of emulsion flowing into the lower chamber of the matched main valve is controlled, thereby controlling the pressure in the lower chamber of the matched main valve (as shown here). Figure 6 (This is a schematic diagram of the state when the pilot valve is open). Under the action of this pressure, the main valve core moves along the central axis towards the main valve push rod. At this time, 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 accurately control the displacement of the main valve core.

[0064] When the flow rate of the digital throttle valve increases or decreases, the duty cycle of the high-speed switching valves of pilot valve I and pilot valve II is changed respectively, and the opening of the ball valve core of pilot valve I and pilot valve II is adjusted, thereby controlling the pressure in the lower chamber of the main valve, so that the main valve core moves along the central axis, thereby achieving the purpose of controlling the displacement of the main valve.

[0065] As can be seen from the above description, the high-pressure, high-flow, high-water-based cartridge digital throttle valve and control method provided in this application not only have the characteristics of simple structure, low leakage, rapid response and strong anti-pollution ability, but also can meet the working conditions of high pressure and high flow.

[0066] As used herein, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It is also to be understood that terms such as those defined in commonly used dictionaries are to take on ordinary and customary meanings unless otherwise explicitly provided herein and are to be interpreted as being indicative of the meaning attributed to them by those of ordinary skill in the art and are not to be construed in an idealized or overly formal sense.

[0067] As used herein, the meaning of "and / or" includes all of the following alternatives: each individual one of the alternatives exists, or both alternatives exist.

[0068] As used herein, the meaning of "connected" can be direct connection between components or indirect connection between components through other components.

[0069] Based upon the above-described ideal embodiments according to the present application, the relevant personnel can make various changes and modifications without deviating from the technical idea of the present application according to the above-described contents. The technical scope of the present application is not limited to the contents of the specification, and must be determined by the scope of the claims.

Claims

1. A high-pressure, high-flow-rate, high-water-based cartridge-type digital throttle valve, characterized in that: The system includes a main valve and a pilot valve. The main valve includes a main valve core (1) and a main valve seat (2). The main valve core (1) is embedded in the main valve seat (2) and the two are arranged coaxially. A flow channel c (13) is opened on the central axis of the main valve core (1). A main valve core damping hole (14) is installed near the inlet of the main valve core (1) in the flow channel c (13). A main valve push rod (9) is installed at the outlet of the flow channel c (13). That is, one end of the main valve push rod (9) is connected to the top of the main valve core (1). The other end of the main valve push rod (9) is covered with a main valve spring adjusting nut (11). A main valve spring (8) is sleeved on the main valve push rod (9) located between the main valve spring adjusting nut (11) and the top of the main valve core (1). A boss is formed by protruding outward on the circumferential wall near the top of the main valve core (1). The chamber between the main valve core (1) and the main valve seat (2) is divided into the lower main valve control chamber (4) and the upper main valve control chamber (5) from the inlet of the flow channel c (13) to the outlet of the flow channel c (13). The high water base liquid flows into the upper main valve chamber from the inlet of the main valve core (1) through the damping hole (14) of the main valve core, the flow channel c (13) and the main valve push rod (9), so as to achieve pressure balance with the main valve core. The pilot valve body (20) is connected to the main valve. The pilot valve controls the pressure in the lower chamber (4) of the main valve control, overcomes the force of the main valve spring (8), and then controls the axial displacement of the main valve core (1) in the main valve seat (2) to realize the regulation of the output flow of the main valve. The pilot valve includes two identical two-position two-way cartridge ball valves, namely pilot valve I (15) and pilot valve II (16), which are threaded into the pilot valve body (20); Pilot valve I (15) or pilot valve II (16) includes a high-speed switching valve (22) arranged coaxially, an upper pilot valve core (24), an upper pilot valve spring (25), a ball valve seat (27), a ball valve core (28), a ball valve reset seat (30), a ball valve reset spring (31), a pilot cartridge valve body (32), and a pilot valve plug (33); The upper pilot valve core (24) is coaxially installed inside the pilot cartridge valve body (32). In the space between the bottom end of the upper pilot valve core (24) and the bottom of the pilot cartridge valve body (32), the ball valve seat (27) and the pilot valve plug (33) are connected to the pilot cartridge valve body (32) by threads. A boss is coaxially provided at the bottom of the ball valve reset seat (30). The ball valve reset spring (31) is embedded in the boss. The ball valve reset spring (31) is coaxially arranged with the boss. The ball valve reset seat (30) can be slidably installed on the top of the pilot valve plug (33). The ball valve core (28) is installed on the top of the ball valve reset seat (30). The ball valve core (28) can roll on the top of the ball valve reset seat (30). The ball valve reset seat (30) abuts against the conical surface of the ball valve seat (27) under the action of the ball valve reset spring (31) and forms a line seal. The space containing the ball valve seat (27), ball valve core (28), ball valve reset seat (30), and pilot valve plug (33) forms the pilot oil inlet chamber (29); The middle circumferential wall of the upper pilot valve core (24) protrudes outward to form an annular platform. The diameter of the annular platform is larger than the diameter of the central hole of the pilot cartridge valve body (32). One end of the upper pilot valve spring (25) is sleeved on the bottom end of the upper pilot valve core (24), that is, the top end of the upper pilot valve spring (25) is in contact with the bottom surface of the annular platform of the upper pilot valve core (24), and the other end of the upper pilot valve spring (25) is in contact with the top of the ball valve seat (27). Inside the pilot cartridge valve body (32), the space where the upper pilot valve core (24) and the upper pilot valve spring (25) are located forms the main valve control chamber (26). Inside the pilot cartridge valve body (32), the space between the top of the upper pilot valve core (24) and the pilot cartridge valve body (32) forms a pilot control chamber (23). A high-speed switching valve (22) is installed on the top of the pilot cartridge valve body (32), and the oil inlet of the high-speed switching valve (22) is connected to the pilot control chamber (23).

2. The high-pressure, high-flow, high-water-based cartridge-type digital throttle valve according to claim 1, characterized in that: The main valve spring adjusting nut (11) has a groove on the part facing the other end of the main valve push rod (9), and the other end of the main valve push rod (9) is embedded in the groove. A main valve core displacement sensor (10) is also provided between the other end of the main valve push rod (9) and the groove, and the main valve core displacement sensor (10) is connected to the main valve spring adjusting nut (11) by a thread. One end of the main valve push rod (9) is connected to the top of the main valve core (1) by a thread.

3. The high-pressure, high-flow, high-water-based cartridge-type digital throttle valve according to claim 1, characterized in that: A trapezoidal groove is provided on the top of the ball valve reset seat (30), and the ball valve core (28) is embedded in the trapezoidal groove.

4. The high-pressure, high-flow, high-water-based cartridge digital throttle valve according to claim 1, characterized in that: Pilot inlet P P It is connected to the pilot oil inlet chamber (29) of the pilot valve II (16) through the flow channel e (18); The main valve control chamber (26) of pilot valve II (16) is connected to one end of flow channel d (17), while the other end of flow channel d (17) is connected to the oil inlet chamber of pilot valve I (15); Inside pilot valve II (16), pilot control chamber (23) is connected to pilot inlet chamber (29) through pilot damping orifice I (35) and flow channel i (36); inside pilot valve I (15), pilot control chamber (23) is connected to pilot inlet chamber (29) of pilot valve II (16) through flow channel h (34), pilot damping orifice II (37) and flow channel j (38); The main valve control chamber (26) of pilot valve II (16) is connected to the lower control chamber (4) of the main valve through flow channel a (6); one end of the main valve control chamber (26) of pilot valve I (15) is connected to the upper control chamber (5) of the main valve through flow channel b (7), and the other end is connected to the pilot return port through flow channel f (19); The return port of the pilot valve I (15) high-speed switching valve (22) and the return port of the pilot valve II (16) high-speed switching valve (22) are connected to the pilot return port of the pilot valve (12) in sequence through the flow channel g (21) and the flow channel f (19).

5. A control method based on the high-pressure, high-flow, high-water-based cartridge digital throttle valve according to claim 4, characterized in that: When the digital throttle valve is in a state of no flow output, the high-speed switching valve (22) of pilot valve I (15) and pilot valve II (16) is normally open. The high water-based emulsion in the pilot control chamber (23) flows back to the emulsion tank through the high-speed switching valve (22). The ball valve core (28) is pressed against the ball valve seat (27) under the action of the ball valve return spring (31). Pilot valve I (15) and pilot valve II (16) are in a closed state. The pressure in the upper chamber (5) and the lower chamber (4) controlled by the main valve is zero. The main valve core (1) is in contact with the main valve seat (2) under the action of the main valve spring (8), and the displacement of the main valve core (1) is zero.

6. The control method for the high-pressure, high-flow, high-water-based cartridge digital throttle valve according to claim 5, characterized in that: When the digital throttle valve is in the position where emulsion needs to be output, the displacement of the main valve core (1) opening is calculated according to the relationship between the valve orifice flow and displacement, and the displacement signal is converted into the duty cycle signal of the high-speed switching valves of pilot valve I (15) and pilot valve II (16). By controlling the proportion of the switching time in a single cycle of the high-speed switching valve, the pressure of the pilot control chamber (23) of pilot valve I (15) and pilot valve II (16) is controlled, and the upper pilot valve core (24) is in Under the pressure of the pilot control chamber (23), the emulsion moves along the central axis toward the ball valve core, pushing the ball valve core (28) open. The emulsion flows from the pilot oil inlet chamber (29) of the pilot valve II (16) through the main valve control chamber (26), part of which flows into the main valve control chamber (4), and the other part flows back to the pilot return port through the flow channel d (17), the pilot oil inlet chamber (29) of the pilot valve I (15), the main valve control chamber (26), and the flow channel f (19), that is, back to the emulsion tank. By controlling the duty cycle of the high-speed switching valve of pilot valve II (16), the amount of emulsion flowing into the lower chamber (4) of its main valve is controlled; by controlling the duty cycle of the high-speed switching valve of pilot valve I (15), the amount of emulsion flowing out of the lower chamber (4) of its main valve is controlled; by controlling the duty cycle of the two high-speed switching valves respectively, the amount of emulsion actually flowing into the lower chamber of the matching main valve is controlled; and thus the pressure of the lower chamber (4) of the matching main valve is controlled. Under the action of this pressure, the main valve core (1) moves along the central axis toward the main valve push rod. At this time, the displacement signal of the main valve core (1) measured by the main valve core displacement sensor (10) is compared with the expected displacement signal of the main valve core, and the error signal is input to the controller to accurately control the displacement of the main valve core (1).

7. The control method for the high-pressure, high-flow, high-water-based cartridge digital throttle valve according to claim 6, characterized in that: When the flow rate of the digital throttle valve increases or decreases, the duty cycle of the high-speed switching valves of pilot valve I (15) and pilot valve II (16) is changed respectively, and the opening of the ball valve core (28) of pilot valve I (15) and pilot valve II (16) is adjusted, thereby controlling the pressure of the lower chamber (4) of the main valve, so that the main valve core (1) moves along the central axis, thereby achieving the purpose of controlling the displacement of the main valve.

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