A large-passage digital throttling valve and a digital speed regulating valve

Abstract

The present application relates to the technical fields of hydraulic system, more particularly, to a large-diameter digital throttle valve and a digital governing valve, comprising an adjustable throttle valve and at least one two-position two-way electromagnetic valve I, wherein the adjustable throttle valve and the two-position two-way electromagnetic valve I are arranged in parallel. The large-diameter digital throttle valve is connected in parallel with a plurality of two-position two-way valves and an adjustable throttle valve, so as to realize the complementary advantages of the two, on the one hand, different throttle areas can be realized by using different two-position two-way valve combinations, on the other hand, the parallel adjustable throttle valve can realize continuous change of the throttle area, avoiding high-frequency switching of the two-position two-way valve and reducing the flow and pressure impact caused by the digital valve.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and more specifically, to a large-diameter digital throttle valve and a digital speed control valve. Background Technology

[0002] Digital throttle valves, with their excellent characteristics such as good fault tolerance, high cost-effectiveness, and strong anti-pollution capability, are gradually becoming a research hotspot in the field of hydraulic technology. Compared with servo valves and proportional valves, digital throttle valves have a simpler structure, lower cost, and are easier to maintain. Digital hydraulic components are hydraulic components with discrete flow or discrete control signals. Flow discretization technology can be divided into two branches: one is the switching inertia hydraulic technology based on high-speed switching valve flow control, and the other is the parallel digital hydraulic technology based on hydraulic valve array combination flow control. Parallel digital hydraulic technology utilizes the logical combination of hydraulic components to achieve active control without relying on the high-speed switching performance of control valves. It has lower system hardware requirements, a large flow regulation range, and good energy efficiency and reliability.

[0003] Digital throttle valves are the core components of digital hydraulic technology. They control the flow output by controlling the opening and closing states of multiple parallel digital switching valves. The coupling of multiple fluids can create pressure pulsations at the load end, affecting the stability of the system's output pressure and generating vibration and noise.

[0004] Large-diameter speed control valves typically consist of a large-diameter flow sensor and a large-diameter throttle valve. Existing large-diameter flow sensors and throttle valves are both difficult and costly to manufacture. A solution is to use a large-diameter flow sensor composed of multiple small-flow two-position two-way valves, and to replace the large-diameter flow valve with multiple two-position two-way valves and adjustable flow valves. This solution relies on electronic control hardware or software algorithms for rational control and calculation, achieving the functionality of a large-diameter speed control valve. This approach effectively reduces manufacturing difficulty and improves the versatility of components. Summary of the Invention

[0005] The present invention aims to at least solve one of the problems existing in the prior art. To this end, one aspect of the present invention is to provide a large-diameter digital throttle valve with low vibration and noise, which can reduce the internal pressure and flow shock of parallel digital valves.

[0006] Another objective of this invention is to provide a large-diameter digital speed control valve including the large-diameter digital throttle valve.

[0007] To achieve the above objectives, one embodiment of the present invention provides a large-diameter digital throttle valve, including an adjustable flow valve and at least one two-position two-way solenoid valve I, wherein the adjustable flow valve and the two-position two-way solenoid valve I are arranged in parallel.

[0008] Furthermore, the adjustable flow valve is a proportional throttle valve or an incremental digital throttle valve.

[0009] Furthermore, the adjustable flow valve can be replaced by a high-speed switching valve.

[0010] Another embodiment of the present invention provides a large-diameter digital speed control valve, including a large-diameter flow sensor, a controller, and a large-diameter digital throttling valve disclosed in the above embodiments, wherein the large-diameter flow sensor, the two-position two-way solenoid valve I, and the adjustable flow valve are all electrically connected to the controller;

[0011] The large-diameter flow sensor includes a small-diameter flow sensor and at least one two-position two-way solenoid valve II. The oil inlet and oil outlet of the two-position two-way solenoid valve II are respectively connected to the oil inlet and oil outlet of the small-diameter flow sensor, and the oil outlet of the small-diameter flow sensor is connected to the oil inlet of the large-diameter digital throttle valve.

[0012] Furthermore, the oil outlet of the small-diameter flow sensor is connected to the spring cavity of the small-diameter flow sensor through a damping hole.

[0013] The beneficial effects of this invention compared to the prior art are as follows:

[0014] This invention employs multiple two-position two-way valves combined with an adjustable flow valve to construct a large-diameter digital throttle valve. This ensures that the digital valve can achieve different combinations of throttling areas and enables continuous variation of flow rate, reducing the number of switching operations of the two-position two-way valves and effectively minimizing flow and pressure shocks in the hydraulic system caused by high-frequency switching. A small-diameter flow sensor and multiple two-position two-way valves are used to construct a large-diameter digital flow sensor. Combining the large-diameter digital throttle valve and the digital flow sensor to construct a large-diameter digital speed control valve effectively reduces manufacturing difficulty, improves component versatility, and achieves high-precision control at both low and high flow rates. Algorithms are used to improve control accuracy and reduce costs. Attached Figure Description

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 A schematic diagram of a large-diameter digital throttle valve;

[0017] Figure 2 A schematic diagram of a large-diameter digital flow sensor;

[0018] Figure 3 This is a schematic diagram of a large-diameter digital speed control valve.

[0019] In the diagram: 1-Adjustable flow valve, 2-Two-position two-way solenoid valve I, 3-Large diameter flow sensor, 3.1-Small diameter flow sensor, 3.2-Two-position two-way solenoid valve II, 3.3-Damping orifice, 3.4-Valve core, 3.5-Valve sleeve, 3.6-Cover plate, 3.7-Spring, 3.8-Displacement sensor, 4-Controller. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1:

[0022] like Figure 1 As shown, a large-diameter digital throttle valve includes an adjustable flow valve 1 and at least one two-position two-way solenoid valve I2. The adjustable flow valve 1 and the multiple two-position two-way solenoid valves I2 are connected in parallel. The oil inlets of the adjustable flow valve 1 and the two-position two-way solenoid valves I2 are connected to form the oil inlet of the large-diameter digital throttle valve, and the oil outlets of the adjustable flow valve 1 and the two-position two-way solenoid valves I2 are connected to form the outlet of the large-diameter digital throttle valve. The adjustable flow valve 1 can be a proportional throttle valve or an incremental digital throttle valve.

[0023] The adjustable flow valve 1 can also be replaced by a high-speed switching valve.

[0024] Working principle:

[0025] Taking the installation of two two-position two-way solenoid valves I2 as an example,

[0026] The two 2-position 2-way solenoid valves I of the large-diameter digital throttle valve are designated as solenoid valve #1 and solenoid valve #2, respectively. The rated flow rates of solenoid valve #1 and solenoid valve #2 are Q, respectively. a Q b The rated flow rate of the adjustable flow valve / high-speed switching valve is Q. c , where Q a ≤Q b ≤Q c The flow rate of the large-diameter digital flow valve is Q. Z ;

[0027] The working process of a large-diameter digital throttle valve is as follows:

[0028] When the flow rate Q of the large-diameter digital flow valve Z ≤Q a At this time, an adjustable flow valve / high-speed switching valve is used to control the flow rate;

[0029] When the flow rate Q of the large-diameter digital flow valve a ≤Q Z ≤Q a +Q b When the solenoid valve #1 is activated, the flow rate is controlled by an adjustable flow valve / high-speed switching valve.

[0030] When the flow rate Q of the large-diameter digital flow valve a +Q b ≤Q Z ≤Q a +Q b +Q c When the flow rate is controlled, solenoid valves #1 and #2 are activated, and an adjustable flow valve / high-speed switching valve is used to control the flow rate.

[0031] Large-diameter digital throttle valves connect multiple two-position two-way valves in parallel, and then connect them in parallel with an adjustable flow valve or a high-speed switching valve to achieve complementary advantages. On the one hand, different combinations of two-position two-way valves can achieve different throttling areas. On the other hand, the parallel adjustable flow valve can achieve continuous changes in the throttling area, avoiding high-frequency switching of the two-position two-way valves and reducing the flow and pressure shocks caused by digital valves.

[0032] Example 2:

[0033] A large-diameter digital speed control valve includes a large-diameter flow sensor 3, a controller 4, and a large-diameter digital throttling valve as described in Example 1. The large-diameter flow sensor 3, the two-position two-way solenoid valve I2, and the adjustable flow valve 1 are all electrically connected to the controller 4. The controller 4 controls the two-position two-way solenoid valve I2 and the adjustable flow valve 1 based on the signal fed back from the sensor 3.

[0034] The large-diameter flow sensor 3 includes a small-diameter flow sensor 3.1 and at least one two-position two-way solenoid valve II 3.2. The small-diameter flow sensor 3.1 can be a differential pressure flow sensor as described below.

[0035] like Figure 2As shown, the flow sensor includes a valve core 3.4, a valve sleeve 3.5, a cover plate 3.6, a spring 3.7, and a displacement sensor 3.8. The valve core 3.4 is located inside the valve sleeve 3.5, and the cover plate 3.6 is located at one end of the valve sleeve 3.5. The spring 3.7 is installed inside the valve sleeve 3.5, and its two ends abut against the valve core 3.4 and the cover plate 3.6, respectively. The spring 3.7 pushes the valve core 3.4 to contact the lower part of the valve sleeve 3.5. The lower end of the displacement sensor 3.8 is connected to the valve core 3.4. Fluid enters through the oil inlet at the lower part of the valve sleeve 3.5 and flows out through the oil outlet of the valve sleeve 3.5 through the gap between the valve core 3.4 and the valve sleeve 3.5. The fluid at the oil outlet enters the spring cavity at the top of the valve core 3.4 through the oil passage. The valve core 3.4 moves up and down under the action of the spring force and the hydraulic pressure at the upper and lower ends of the valve core 3.4. The displacement sensor 3.8 sends an electrical signal.

[0036] The output signal of the differential pressure flow sensor and the electric drive device of the two-position two-way solenoid valve II3.2 are both connected to the controller.

[0037] The inlet and outlet of the two-position two-way solenoid valve II 3.2 are connected to the inlet and outlet of the small-diameter flow sensor 3.1, respectively. The outlet of the small-diameter flow sensor 3.1 is connected to the spring cavity of the small-diameter flow sensor through a damping hole 3.3. The large-diameter flow sensor 3 can also be used as a separate component.

[0038] The relationship between the flow rate of a small-diameter flow sensor and the signal from a displacement sensor is as follows:

[0039] Q0 = f(s)

[0040] In the formula, s is the output signal of the displacement sensor.

[0041] The inlet of the small-diameter flow sensor 3.1 is connected to the inlet of the digital speed control valve, and the outlet of the small-diameter flow sensor 3.1 is connected to the inlet of the large-diameter digital throttle valve. The outlet of the large-diameter digital throttle valve serves as the outlet of the digital speed control valve.

[0042] In the large-diameter digital flow sensor, the two 2-position 2-way solenoid valves II are designated as solenoid valve #3 and solenoid valve #4, respectively. The flow rate Q of the two valves is calibrated through testing. #3 Q #4 Relationship with pressure loss Δp:

[0043] Q #3 =g(△p)

[0044] Q #4 =h(△p)

[0045] When the pressure difference between the inlet and outlet of solenoid valve #3 and solenoid valve #4 is Δp0, the flow rates through solenoid valve #3 and solenoid valve #4 are Q1 and Q2, respectively. Δp0 is equal to the constant pressure difference between the inlet and outlet caused by the spring inside the flow sensor. Q1≤Q2≤Q3, where Q3 is the rated flow rate of the flow sensor.

[0046] The working process of a large-diameter digital flow sensor is as follows.

[0047] When the total flow rate Q of the large-diameter digital flow sensor Z1 When ≤Q1, the displacement sensor of the digital flow sensor outputs a displacement signal;

[0048] When the total flow rate Q1 of the large-diameter digital flow sensor is less than QZ1 When ≤Q1+Q2, solenoid valve #3 is turned on, and the displacement sensor using the digital flow sensor outputs a displacement signal;

[0049] When the total flow rate of the large-diameter digital flow sensor is Q1+Q2≤Q Z1 When Q1+Q2+Q3 is less than or equal to Q3, solenoid valves #3 and #4 are turned on, and the displacement sensor using the digital flow sensor outputs a displacement signal.

[0050] The total flow Q Z1 The calculation formula is:

[0051] Q Z1 =Q0+I1Q1+I2Q2=f(s)+I1Q1+I2Q2

[0052] Where I1 and I2 are 0 or 1, 0 and 1 respectively indicate that the control signals of solenoid valves #3 and #4 are disconnected and connected.

[0053] The working process of a large-diameter digital speed control valve is as follows:

[0054] When the flow input signal of the electronic control unit is Q, the output flow rate is Q. Z It should be Q Z =Q Z1 If there is a difference between the input and output flow rates, ΔQ = QQ Z Then, the flow rate is adjusted by changing the control signal of the adjustable flow valve / high-speed switching valve of the large-diameter digital throttle valve. If the flow rate ΔQ > 0, then the control signal of the adjustable flow valve / high-speed switching valve QZ is reduced; if ΔQ < 0, then Q... Z The control signal of the adjustable flow valve / high-speed switching valve is increased until ΔQ decreases to the allowable range.

[0055] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A large-diameter digital speed control valve, characterized in that: It includes a large-diameter flow sensor (3), a controller (4) and a large-diameter digital throttle valve. The large-diameter flow sensor (3), the two-position two-way solenoid valve I (2) and the adjustable flow valve (1) are all electrically connected to the controller (4). The large-diameter flow sensor (3) includes a small-diameter flow sensor (3.1) and at least one two-position two-way solenoid valve II (3.2). The oil inlet and oil outlet of the two-position two-way solenoid valve II (3.2) are respectively connected to the oil inlet and oil outlet of the small-diameter flow sensor (3.1). The oil outlet of the small-diameter flow sensor (3.1) is connected to the oil inlet of the large-diameter digital throttle valve. The large-diameter digital throttle valve includes an adjustable flow valve (1) and at least one two-position two-way solenoid valve I (2), wherein the adjustable flow valve (1) and the two-position two-way solenoid valve I (2) are arranged in parallel; The adjustable flow valve (1) is a proportional throttle valve or an incremental digital throttle valve.

2. The large-diameter digital speed control valve according to claim 1, characterized in that: The oil outlet of the small-diameter flow sensor (3.1) is connected to the spring cavity of the small-diameter flow sensor through a damping hole (3.3).

3. The large-diameter digital speed control valve according to claim 1, characterized in that: The adjustable flow valve (1) can be replaced by a high-speed switching valve.

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