A digitally piloted high-temperature fluid proportional control valve and its control method

Abstract

This invention belongs to the field of special proportional control valve technology, specifically a digitally piloted high-temperature fluid proportional control valve and its control method. It includes a valve body, a valve core, an array valve group, and a control oil circuit. The valve body forms a pilot valve chamber and a main valve chamber. A piston is installed at one end of the valve core extending into the pilot valve chamber, dividing the pilot valve chamber into a rodless chamber and a rod chamber. A first cold oil inlet on the rodless chamber and the array valve group constitute a pilot control half-bridge for controlling the valve core position. The array valve group includes multiple high-speed switching valves connected to the first cold oil outlet. The position change of the valve core controls the flow rate of the main oil circuit, realizing the proportional regulation of the high-temperature fluid. The rod chamber is connected to a second cold oil inlet. The pilot oil circuit is a cold oil circuit, and the main oil circuit is used to control the high-temperature fluid. This application improves response speed and fault tolerance by setting multiple parallel high-speed switching valves, and enhances regulation accuracy through selective opening and closing of the high-speed switching valves.

Description

Technical Field

[0001] This invention belongs to the field of proportional control valve technology, specifically a digital valve-piloted high-temperature fluid proportional control valve and its control method. Background Technology

[0002] In the field of high-temperature fluid regulation (such as high-temperature fuel regulation systems for engines and high-temperature steam regulation systems), the working medium temperature often exceeds 600℃. Conventional electromechanical drive mechanisms cannot directly drive the main valve core due to temperature limitations. Therefore, "pilot drive" technology is commonly used in the field of high-temperature fluid regulation, which indirectly controls the throttling action of the high-temperature main valve through a low-temperature pilot fluid. The current mainstream solution is to use a servo valve as a pilot, which controls the main valve core to move according to the command and proportionally adjusts the fluid in the main valve core. Since the temperature of the hot fluid or steam regulated by the main valve core is very high, the pilot fluid also needs to leak under normal conditions to ensure continuous circulation of the pilot fluid and avoid excessive temperature. The conventional method is to reserve a fixed throttling orifice bypass, which results in continuous leakage. This method affects the response speed. Moreover, using a servo valve as a pilot valve to regulate the main valve core has low contamination resistance, low reliability, and poor failure modes, which can easily lead to the main valve core being fully open. In addition, servo valves have high requirements for the operating environment and rely on continuous analog signal input, making them susceptible to electromagnetic interference and difficult to achieve nonlinear compensation. Summary of the Invention

[0003] To address the problems mentioned above, this invention provides a digital valve-piloted high-temperature fluid proportional control valve and control method. By employing an array valve group, selective control of the high-speed switching valve is achieved, thereby improving the adjustment accuracy and enabling on-demand adjustment to reduce overflow losses.

[0004] The first objective of this invention is to provide a digitally piloted high-temperature fluid proportional control valve, which includes a valve body, a valve core, an array valve assembly, and a control oil circuit, wherein:

[0005] The valve body contains a pilot valve chamber and a main valve chamber that are isolated from each other. The two ends of the valve core are slidably connected to the pilot valve chamber and the main valve chamber, respectively. A piston is provided at the end of the valve core that extends into the pilot valve chamber. The piston divides the pilot valve chamber into a rodless chamber and a rod chamber. The rodless chamber is provided with a first cold oil inlet and a first cold oil outlet, and the rod chamber is provided with a second cold oil inlet. The main valve chamber is provided with a high-temperature oil inlet and a high-temperature oil outlet.

[0006] The array valve group includes multiple high-speed switching valves arranged in parallel. Each of the multiple high-speed switching valves has a corresponding branch pipeline. The two ends of the high-speed switching valves are connected to the first main pipeline and the second main pipeline through the branch pipelines, respectively. The first main pipeline is connected to the first cold oil outlet, and the second main pipeline is connected to the oil tank. A damping orifice is provided on the oil inlet pipeline connected to the first cold oil inlet. The multiple high-speed switching valves are normally open high-speed switching valves and / or normally closed high-speed switching valves.

[0007] The control oil circuit includes a pilot oil circuit and a main oil circuit. The pilot oil circuit is used to control the pressure in the rodless chamber to change the position of the valve core in the valve body; the change in the position of the valve core controls the flow rate of the main oil circuit.

[0008] Furthermore, when the array valve group includes multiple high-speed switching valves arranged in parallel, at least one of the high-speed switching valves is a normally open high-speed switching valve, and the rest are normally closed high-speed switching valves.

[0009] The normally closed high-speed switching valve is in the non-energized closed state, and the normally open high-speed switching valve is in the non-energized normally open state.

[0010] Furthermore, a spring is fixed between the piston and the bottom wall of the rodless chamber; in the initial state, the spring is in a compressed state and applies pressure to the valve core, causing one end of the valve core to block the high-temperature oil outlet.

[0011] Furthermore, the valve core is a heat conductor, and the valve core located in the main valve chamber is in contact with the high-temperature oil, transferring the heat of the hot oil in the main oil circuit to the cold oil in the pilot oil circuit.

[0012] Furthermore, the movement of the valve core within the main valve chamber can proportionally control the area of ​​the high-temperature oil inlet and outlet.

[0013] Furthermore, the oil inlet pipe of the first cold oil inlet is also connected to an oil inlet branch pipe, which is connected to the second cold oil inlet. The damping hole is connected between the connection point of the oil inlet branch pipe and the oil inlet pipe and the first cold oil inlet.

[0014] The system pressure is applied to the rod chamber from the oil inlet pipe, and the system pressure in the rod chamber remains constant.

[0015] Furthermore, it also includes a controller that controls the opening and closing of the high-speed switching valve.

[0016] Furthermore, a position sensor is installed at the end of the piston. The controller controls the pilot oil circuit to move the piston to a certain position. The position sensor provides feedback on the position of the piston in the pilot valve chamber, and the position of the valve core provides feedback on the flow rate in the main oil circuit.

[0017] Furthermore, a first pressure sensor is installed on the front end pipe of the damping orifice, which is used to collect the pressure acting in the rod chamber; a second pressure sensor is installed on the rear end pipe of the damping orifice, which is used to collect the pressure acting in the rodless chamber; a third pressure sensor is installed on the pipe of the high-temperature oil inlet, which is used to collect the high-temperature oil inlet pressure; and a fourth pressure sensor is installed on the pipe of the high-temperature oil outlet, which is used to collect the high-temperature oil outlet pressure.

[0018] A second objective of this invention is to provide a control method for a digitally piloted high-temperature fluid proportional control valve, implemented based on any one of the above-mentioned high-temperature fluid proportional control valves, comprising:

[0019] Initial state control mode: Multiple normally closed high-speed switching valves in the array valve group are in the non-energized closed state, and normally open high-speed switching valves are in the non-energized normally open state. The system pressure formed by the high-pressure low-temperature cold oil acts on the rod chamber. After the oil passes through the damping orifice, the pressure decreases and it enters the rodless chamber from the first cold oil inlet. The oil in the rodless chamber flows back to the oil tank through the normally open high-speed switching valve. The valve core moves to the equilibrium position, the valve core is stable, and the main oil circuit is not connected.

[0020] Main oil circuit flow increase control mode: control one or more normally closed high-speed switching valves and normally open high-speed switching valves in the control array valve group open, the pressure in the rodless chamber of the valve core decreases, the valve core is unbalanced and moves towards the rodless chamber until the valve core is balanced, the valve core opening increases, and the flow of the main oil circuit increases;

[0021] Main oil circuit flow reduction control mode: According to the flow reduction demand of the main oil circuit, one or more high-speed switching valves in the control array valve group are closed, the pressure in the rodless chamber of the valve core increases, the valve core is unbalanced and moves towards the rod chamber until the valve core is balanced, the valve core opening decreases, and the flow of the main oil circuit decreases.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The high-temperature fluid proportional control valve of the present invention includes a valve body, a valve core, an array valve group, and a control oil circuit. The array valve group includes multiple high-speed switching valves arranged in parallel, each corresponding to a branch pipeline. The two ends of the high-speed switching valves are connected to a first main pipeline and a second main pipeline respectively through the branch pipelines. The first main pipeline is connected to a first cold oil outlet, and the second main pipeline is connected to an oil tank. A damping orifice is provided on the oil inlet pipeline connected to the first cold oil inlet. The multiple high-speed switching valves are normally open high-speed switching valves and / or normally closed high-speed switching valves. The multiple high-speed switching valves arranged in parallel can work independently or in parallel, which can improve the response speed and fault tolerance. Even if some high-speed switching valves fail, they can still work normally. Using high-speed switching valves to replace the downstream damping orifice not only improves the adjustment accuracy.

[0024] Furthermore, this application utilizes multiple high-speed switching valves to form a digital valve, replacing the unreliable electro-hydraulic servo valve, thereby improving system reliability and simplifying the system structure. Simultaneously, a normally open high-speed switching valve replaces the downstream orifice. During stable operation, the normally open high-speed switching valve remains open to ensure pilot fluid circulation and prevent oil overheating. When a high-speed response is required, the normally open high-speed switching valve closes, improving the response speed of closing the main oil circuit. The main purpose of using a normally open high-speed switching valve instead of an orifice is to make downstream leakage controllable. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of the high-temperature fluid proportional control valve of the present invention;

[0027] Figure 2 This is a simplified structural diagram of the high-temperature fluid proportional control valve of the present invention;

[0028] Figure 3 This is a schematic diagram of the control oil circuit for the high-temperature fluid proportional regulating valve of the present invention;

[0029] Figure 4 This is a schematic diagram of the initial state of the high-temperature fluid proportional control valve of the present invention;

[0030] Figure 5 A schematic diagram (I) of the process of increasing the main oil circuit flow of the high-temperature fluid proportional control valve of the present invention.

[0031] Figure 6Schematic diagram (II) of the process of increasing the main oil circuit flow of the high-temperature fluid proportional control valve of the present invention.

[0032] Figure 7 This is a schematic diagram of the main oil circuit flow reduction process of the high-temperature fluid proportional control valve of the present invention;

[0033] Wherein: 1-valve body, 11-pilot valve chamber, 111-rodless chamber, 112-rod chamber, 113-first cold oil inlet, 114-first cold oil outlet, 115-second cold oil inlet, 12-main valve chamber, 121-high temperature oil inlet, 122-high temperature oil outlet, 13-oil inlet pipe, 14-damping orifice, 15-oil inlet branch pipe, 2-valve core, 21-piston, 3-array valve group, 31-normally open high-speed switching valve, 32-normally closed high-speed switching valve, 33-branch pipe, 34-first main pipe, 35-second main pipe, 36-oil tank, 4-pilot oil circuit, 5-main oil circuit, 6-spring. Detailed Implementation

[0034] The technical solutions in 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 protection scope of the present invention.

[0035] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The invention is described in detail with specific embodiments.

[0036] like Figures 1 to 7 As shown, this invention provides a digitally piloted high-temperature fluid proportional control valve, which includes a valve body 1, a valve core 2, an array valve group 3, and a control oil circuit, wherein:

[0037] The valve body 1 has a pilot valve chamber 11 and a main valve chamber 12 that are isolated from each other. The two ends of the valve core 2 are slidably connected in the pilot valve chamber 11 and the main valve chamber 12, respectively. A piston 21 is provided at the end of the valve core 2 that extends into the pilot valve chamber 11. The piston 21 divides the pilot valve chamber 11 into a rodless chamber 111 and a rod chamber 112. The rodless chamber 111 is provided with a first cold oil inlet 113 and a first cold oil outlet 114. The rod chamber 112 is provided with a second cold oil inlet 115. The main valve chamber 12 is provided with a high-temperature oil inlet 121 and a high-temperature oil outlet 122.

[0038] The array valve group 3 includes multiple high-speed switching valves arranged in parallel. Each of these valves has a corresponding branch line 33. The two ends of each high-speed switching valve are connected to a first main line 34 and a second main line 35 via the branch lines 33. The first main line 34 is connected to a first cold oil outlet 114, and the second main line 35 is connected to an oil tank 36. A damping orifice 14 is provided on the inlet line 13 connected to the first cold oil inlet 113. The first cold oil inlet 113, the damping orifice 14, and the array valve group 3 on the rodless chamber 111 constitute a pilot control half-bridge for controlling the position of the valve core 2. The multiple high-speed switching valves are normally open high-speed switching valves 31 and / or normally closed high-speed switching valves. 32; Through the coordinated operation of multiple high-speed switching valves, continuous proportional regulation of the cooling oil can be achieved, and the remaining valves can still maintain basic functions when a single valve fails, demonstrating strong fault tolerance; at the same time, due to the short response time of the high-speed switching valve, it can meet the special requirements of rapid response under high-temperature conditions; it should be noted that a high-speed switching valve is a valve that can be opened or closed rapidly in a very short time. Its core characteristics are fast response speed and high operating frequency, and it can complete the opening and closing action in a very short time. In this application, the high-speed switching valve is a discrete switch. This application does not describe the specific structure of the high-speed switching valve. Those skilled in the art can choose commonly used high-speed switching valves on the market, or they can design their own according to their needs.

[0039] See Figure 3 The high-temperature fluid proportional control valve of this application is divided into two parts: a pilot drive part and a main oil circuit part. Therefore, the control oil circuit includes a pilot oil circuit 4 and a main oil circuit 5. The pilot oil circuit 4 uses cold oil circulation, and the main oil circuit 5 is for high-temperature fluid. The pilot oil circuit 4 is used to control the pressure of the rodless chamber 111 to change the position of the valve core 2 in the valve body 1. The change in the position of the valve core 2 can directly change the opening of the oil outlet of the main oil circuit 5, thereby controlling the flow rate of the high-temperature fluid. This application avoids the mixing of high-temperature fluid and low-temperature oil by isolating the pilot oil circuit 4 and the main oil circuit 5. The pilot drive part uses cold oil circulation to reduce the thermal stress of the control element, avoid the aging of precision components caused by high temperature, and extend the service life of precision components.

[0040] In some embodiments, see Figures 2 to 6When the array valve group 3 includes multiple high-speed switching valves arranged in parallel, at least one of the high-speed switching valves is a normally open high-speed switching valve 31, and the rest are normally closed high-speed switching valves 32. The normally closed high-speed switching valve 32 is in a non-energized closed state, and the normally open high-speed switching valve 31 is in a non-energized normally open state. This application uses multiple high-speed switching valves to form a digital valve, replacing the unreliable electro-hydraulic servo valve, thereby improving the system reliability and simplifying the system structure. At the same time, the normally open high-speed switching valve 31 is used as the basic flow channel to replace the downstream damping orifice. During stable operation, the normally open high-speed switching valve 31 remains open to ensure the circulation of the pilot fluid and prevent oil overheating. When a high-speed response is required, the normally open high-speed switching valve 31 closes, which can improve the response speed of closing the main oil circuit. The main purpose of using the normally open high-speed switching valve 31 to replace the downstream damping orifice is to make the downstream leakage controllable. In this application, a normally open high-speed switching valve 31 replaces the traditional downstream damping orifice, eliminating the unadjustability of the fixed damping orifice. Dynamic adjustment of leakage is achieved by actively controlling the opening and closing of the normally open high-speed switching valve 31. The normally closed high-speed switching valve 32 is not energized and is closed only after energization, serving as an auxiliary flow channel to supplement or quickly adjust the flow rate to adapt to dynamic operating conditions. It should be noted that the high-speed switching valve has lower requirements for oil cleanliness than the electro-hydraulic servo valve, which greatly reduces the risk of jamming due to contamination.

[0041] The array valve assembly 3 of this invention achieves on-demand adjustment through digital signals, reducing overflow losses. For example, it can reduce no-load energy consumption in engineering machinery, which aligns with the goals of green manufacturing. Furthermore, the high-speed on / off regulating valve exhibits high resistance to contamination and high reliability.

[0042] For example, using hot oil as fuel, when the aircraft accelerates, the fuel demand increases, requiring a larger opening of the main fuel line 5. Conversely, when the aircraft decelerates, the fuel demand decreases, requiring a smaller opening of the main fuel line 5. The opening of the main fuel line 5 is precisely controlled by a position sensor at piston 21. The position of piston 21 determines the opening of the main fuel line 5, and the flow rate of the main fuel line 5 is also determined. The position of piston 21 is adjusted by regulating a portion of the high-speed switching valve. The entire adjustment process is a dynamic adjustment process with an extremely fast response speed.

[0043] In some embodiments, a spring 6 is also fixed between the piston 21 and the bottom wall of the rodless chamber 111. In the initial state, the spring 6 is compressed and applies pressure to the valve core 2, causing one end of the valve core 2 to block the high-temperature oil outlet 122. By setting the spring 6, when the power is off, the spring force can directly drive the valve core 2 to seal the high-temperature oil outlet 122, forming a double guarantee with the normally open high-speed switching valve of the array valve group 3 for pressure relief; even if the control oil circuit is completely depressurized, the valve can still be closed to avoid leakage of high-temperature medium.

[0044] In some embodiments, the valve core 2 is a heat conductor, and the valve core 2 located in the main valve chamber 12 is in contact with the high-temperature oil, transferring the heat of the hot oil in the main oil circuit 5 to the cold oil in the pilot oil circuit 4. The valve core 2 axially penetrates the pilot valve chamber 11 and the main valve chamber 12, and the main valve end (in contact with high-temperature oil) and the pilot end (in contact with cold oil) of the valve core 2 form a stable heat flow, avoiding local overheating and reducing the axial temperature difference of the valve core 2. Preferably, the valve core 2 is made of steel or alloy steel. It should be noted that, for safety reasons, if the high-temperature fluid at 600°C is not cooled during ignition, heat will accumulate, causing material failure and damaging the proportional control valve structure.

[0045] In this application, the valve core 2 moves within the main valve chamber 12 to proportionally control the areas of the high-temperature oil inlet 121 and the high-temperature oil outlet 122, thereby controlling the flow rate of the main oil circuit. See some embodiments for details. Figure 1 and Figure 2 The high-temperature oil inlet 121 is positioned perpendicular to the sliding direction of the valve core 2, and the high-temperature oil outlet 122 is positioned directly opposite the valve core 2, with the cross-sectional area of ​​the valve core 2 sufficient to cover the high-temperature oil outlet 122. The perpendicular positioning of the high-temperature oil inlet 121 to the sliding direction of the valve core 2 ensures consistent radial force on the valve core 2 and provides a larger heating area, allowing heat to be rapidly transferred to the other end of the valve core 2. Furthermore, the direct alignment of the high-temperature oil outlet 122 with the valve core 2 creates a symmetrical flow field, resulting in a more balanced force distribution on the valve core 2.

[0046] In some embodiments, see Figure 2The first cold oil inlet 113 is connected to an oil inlet branch line 15, which is connected to the second cold oil inlet 115. The damping orifice 14 is connected between the connection point of the oil inlet branch line 15 and the oil inlet line 13 and the first cold oil inlet 113. The system pressure is applied to the rod chamber 112 from the oil inlet branch line 15. The system pressure in the rod chamber 112 is kept constant by adjusting the system pressure in advance. Alternatively, a pressure regulating valve can be installed on the oil inlet branch line 15 to keep the system pressure in the rod chamber 112 constant. Cold oil acts on the rodless chamber 111 through the damping orifice 14. After passing through the damping orifice 14, the cold oil generates a pressure drop, making the pressure in the rodless chamber 111 lower than the initial pressure of the system. The oil inlet branch line 15 branches off from the oil inlet line 13 and connects to the rod chamber 112, directly introducing the system pressure into the rod chamber. This ensures that the pressure in the rod chamber 112 remains constant, preventing the valve core from oscillating due to the influence of the main oil circuit, which would affect the response speed. It should be noted that the second cold oil inlet 115 in this application is both an inlet and an outlet. When the piston 21 moves towards the rod chamber 112, the oil in the rod chamber 112 flows back from the second cold oil inlet 115. The rod chamber 112 is connected to the system oil, and the oil enters and exits through the second cold oil inlet 115, ensuring that the oil pressure in the rod chamber 112 is always the system oil pressure P0.

[0047] Specifically, this application also includes a controller that controls the opening and closing of the high-speed switching valve. It should be understood that the controller in this embodiment of the invention has the functions of acquiring information and controlling the state of certain devices according to a set program.

[0048] Furthermore, a position sensor is installed at the end of piston 21. The controller controls the pilot oil circuit 4 to move piston 21 to a certain position. The position sensor provides feedback on the position of piston 21 within the pilot valve chamber 11, and the position of valve core 2 provides feedback on the flow rate in the main oil circuit 5. During use, the position of valve core 2 is controlled by the controller to open or close the high-speed switching valve.

[0049] In some embodiments, a first pressure sensor is installed on the front end pipe of the damping orifice 14 to collect the pressure P0 acting in the rod chamber 112; a second pressure sensor is installed on the rear end pipe of the damping orifice 14 to collect the pressure Pk acting in the rodless chamber 111; a third pressure sensor is installed on the pipe of the high-temperature oil inlet 121 to collect the high-temperature oil inlet pressure Pg; and a fourth pressure sensor is installed on the pipe of the high-temperature oil outlet 122 to collect the high-temperature oil outlet pressure Pg0. By using sensors and data analysis, the system pressure and flow rate are monitored in real time, enabling dynamic adjustment of the operating strategy to reduce energy waste. The pressure sensors in this application are used for pressure measurement and signal uploading, and the specific product type of the sensors is not limited. It should also be noted that in this application, Pk=D 4 / (D 4 +d 4 Pk*P0 (Pk is the pressure in the rodless chamber 111, D is the diameter of the damping orifice 14, and d is the opening diameter of the high-speed switching valve), Pk*Ak+Fk=P0*A0+Pg0*A1, Ak is the circular area of ​​the piston 21 end face, Fk is the preload of the spring 6, A0 is the annular area of ​​the P0 pressure in the rod chamber 112 acting on the valve core 2, and A1 is the area of ​​the main oil circuit acting on the valve core. When the pressure in the rodless chamber 111 of the valve core increases, the valve core 2 is unbalanced and moves to the right, reducing the spring force until the valve core 2 is balanced, thus reducing the opening of the valve core 2 and regulating the flow rate of the main oil circuit 5; when the pressure in the rodless chamber 111 of the valve core decreases, the valve core 2 is unbalanced and moves to the left, increasing the spring force until the valve core 2 is balanced, thus increasing the opening of the valve core 2 and regulating the flow rate of the main oil circuit 5.

[0050] This invention also provides a control method for a digital valve-piloted high-temperature fluid proportional control valve, implemented based on any one of the above-mentioned high-temperature fluid proportional control valves, comprising:

[0051] Initial state control mode (see) Figure 4 In the array valve group 3, multiple normally closed high-speed switching valves 32 are in a non-energized closed state, and normally open high-speed switching valves 31 are in a non-energized normally open state. The system pressure formed by the high-pressure low-temperature cold oil acts on the rod chamber. After the oil passes through the damping orifice 14, the pressure decreases and enters the rodless chamber 111 from the first cold oil inlet 113. The oil in the rodless chamber 111 flows back to the oil tank 36 through the normally open high-speed switching valve 31 (as shown by the red arrow indicating the direction of oil flow). The valve core 2 moves to the equilibrium position, the valve core 2 is stable, and the main oil circuit 5 is not connected. When the piston 21 is fixed between the bottom wall of the rodless chamber 111 and the spring 6, in the initial state, the pressure in the rodless chamber 111 and the spring force of the spring 6 are balanced with the pressure in the rod chamber 112. The valve core 2 is stable, and the main oil circuit 5 is not connected.

[0052] Main oil circuit flow increase control mode (see) Figure 5 and Figure 6 ): Controlling the opening of one or more normally closed high-speed switching valves 32 and normally open high-speed switching valves 31 in the control array valve group 3, the pressure in the rodless chamber 111 of the valve core decreases, the valve core 2 experiences an unbalanced force and moves towards the rodless chamber 111 (i.e., to the left, such as...). Figure 4 (As shown by the yellow arrow on valve core 2) Move until valve core 2 is in equilibrium, the opening of valve core 2 increases, and the flow rate of main oil circuit 5 increases (e.g., ...). Figure 4 and Figure 5 The red arrows in the diagram represent the flow direction of the oil circuit. Specifically, based on the increased flow demand of the main oil circuit 5, the controller controls one or more normally closed high-speed switching valves 32 and normally open high-speed switching valves 31 in the array valve group 3 to open. The opening of one or more normally closed high-speed switching valves 32 and normally open high-speed switching valves 31 is equivalent to increasing the damping orifice downstream of the rodless chamber 111 to varying degrees (each opened high-speed switching valve is equivalent to a downstream damping orifice). According to Pk=D 4 / (D 4 +d 4 Pk*P0 (Pk is the pressure in the rodless chamber 111, D is the diameter of the damping orifice 14, and d is the opening diameter of the high-speed switching valve), Pk*Ak+Fk=P0*A0+Pg0*A1, Fk is the preload of spring 6. The pressure in the rodless chamber 111 of the valve core decreases, the valve core 2 is unbalanced, and moves to the left to increase the spring force until the valve core 2 is balanced. The opening of the valve core 2 increases, thereby increasing the flow rate of the main oil circuit 5.

[0053] Main oil circuit flow reduction control mode (see) Figure 7 Based on the reduced flow demand in the main oil circuit, one or more high-speed switching valves in the control array valve group are closed, causing the pressure in the rodless chamber 111 of valve core 2 to increase. This results in an unbalanced force on valve core 2, causing it to move towards the rod chamber 112 (i.e., to the right). Figure 7 (As shown by the yellow arrow on valve core 2) until the force on valve core 2 is balanced, the opening of valve core 2 decreases, and the flow rate of main oil circuit 5 decreases (as shown by the yellow arrow on valve core 2). Figure 7 The red arrows in the diagram represent the flow direction of the oil path. In this application, the controller controls the closure of one or more high-speed switching valves in the array valve group 3, which is equivalent to a reduction in the damping orifice downstream of the rodless chamber 111 to varying degrees (each open high-speed switching valve is equivalent to a downstream damping orifice), according to Pk=D 4 / (D 4 +d 4Pk*P0 (Pk is the pressure in rodless chamber 111, D is the diameter of damping orifice 14, and d is the opening diameter of the high-speed switching valve), Pk*Ak+Fk=P0*A0+Pg0*A1, Fk is the preload of spring 6. When the pressure in rodless chamber 111 of the valve core increases, the valve core 2 becomes unbalanced and moves to the right to reduce the spring force until the valve core 2 is balanced. The opening of valve core 2 decreases, thereby reducing the flow rate of the main oil circuit 5. It is worth emphasizing that, according to the flow rate reduction requirement of the main oil circuit 5, the pressure in rodless chamber 111 needs to be increased to a certain fixed value. The process of increasing the pressure in rodless chamber 111 is achieved by closing the high-speed switching valve. During the adjustment process, it can be adjusted by closing one high-speed switching valve in sequence, then two high-speed switching valves. When the pressure in rodless chamber 111 is about to reach the fixed pressure value, that is, when it is about to reach the limit state, at least one high-speed switching valve should be open. Figure 7 (There are two high-speed switching valves in the middle that are open). The pressure can be adjusted to fluctuate around a fixed pressure value by adjusting the open high-speed switching valves.

[0054] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the nature and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention.

Claims

1. A control method for a digitally piloted high-temperature fluid proportional control valve, characterized in that, The high-temperature fluid proportional control valve includes a valve body, a valve core, an array valve group, and a control oil circuit, wherein: The valve body contains a pilot valve chamber and a main valve chamber that are isolated from each other. The two ends of the valve core are slidably connected to the pilot valve chamber and the main valve chamber, respectively. A piston is provided at one end of the valve core that extends into the pilot valve chamber, and the piston divides the pilot valve chamber into a rodless chamber and a rod chamber. The rodless chamber is provided with a first cold oil inlet and a first cold oil outlet, and the rod chamber is provided with a second cold oil inlet. The main valve chamber is provided with a high-temperature oil inlet and a high-temperature oil outlet. The array valve group includes multiple high-speed switching valves arranged in parallel, each with a corresponding branch pipeline. The two ends of each high-speed switching valve are connected to a first main pipeline and a second main pipeline via the branch pipelines. The first main pipeline is connected to the first cold oil outlet, and the second main pipeline is connected to the oil tank. A damping orifice is provided on the oil inlet pipeline connected to the first cold oil inlet. The multiple high-speed switching valves are normally open and / or normally closed high-speed switching valves. The control oil circuit includes a pilot oil circuit and a main oil circuit. The pilot oil circuit is used to control the pressure of the rodless chamber to change the position of the valve core in the valve body. The change in the position of the valve core controls the flow rate of the main oil circuit. Initial state control mode: Multiple normally closed high-speed switching valves in the array valve group are in the non-energized closed state, and normally open high-speed switching valves are in the non-energized normally open state. The system pressure formed by the high-pressure low-temperature cold oil acts on the rod chamber. After the oil passes through the damping orifice, the pressure decreases and it enters the rodless chamber from the first cold oil inlet. The oil in the rodless chamber flows back to the oil tank through the normally open high-speed switching valve. The valve core moves to the equilibrium position, the valve core is stable, and the main oil circuit is not connected. Main oil circuit flow increase control mode: control one or more normally closed high-speed switching valves and normally open high-speed switching valves in the control array valve group open, the pressure in the rodless chamber of the valve core decreases, the valve core is unbalanced and moves towards the rodless chamber until the valve core is balanced, the valve core opening increases, and the flow of the main oil circuit increases; Main oil circuit flow reduction control mode: According to the flow reduction demand of the main oil circuit, control one or more high-speed switching valves in the control array valve group to close, so that the pressure in the rodless chamber of the valve core increases, the valve core is unbalanced and moves towards the rod chamber until the valve core is balanced, the valve core opening decreases, and the flow of the main oil circuit is reduced.

2. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 1, characterized in that, When the array valve group includes multiple high-speed switching valves arranged in parallel, at least one of the high-speed switching valves is a normally open high-speed switching valve, and the rest are normally closed high-speed switching valves. The normally closed high-speed switch valve is in a non-energized closed state, and the normally open high-speed switch valve is in a non-energized normally open state.

3. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 2, characterized in that, A spring is also fixed between the piston and the bottom wall of the rodless chamber; in the initial state, the spring is in a compressed state and applies pressure to the valve core, causing one end of the valve core to block the high-temperature oil outlet.

4. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 1, characterized in that, The valve core is a heat conductor, and the valve core located in the main valve cavity is in contact with the high-temperature oil, transferring the heat of the hot oil in the main oil circuit to the cold oil in the pilot oil circuit.

5. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 4, characterized in that, The valve core can move within the main valve chamber to proportionally control the area of ​​the high-temperature oil inlet and the high-temperature oil outlet.

6. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 1, characterized in that, The first cold oil inlet is connected to an oil inlet branch pipe, which is connected to the second cold oil inlet. The damping hole is connected between the connection point of the oil inlet branch pipe and the oil inlet pipe and the first cold oil inlet. The system pressure is applied to the rod chamber from the oil inlet pipe, and the system pressure in the rod chamber remains constant.

7. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 1, characterized in that, It also includes a controller that controls the opening and closing of the high-speed switching valve.

8. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 7, characterized in that, A position sensor is provided at the end of the piston. The controller controls the pilot oil circuit to move the piston to a certain position. The position sensor provides feedback on the position of the piston in the pilot valve chamber. The position of the valve core provides feedback on the flow rate in the main oil circuit.

9. The control method for a digital valve-piloted high-temperature fluid proportional regulating valve according to claim 7, characterized in that, A first pressure sensor is installed on the front end pipe of the damping orifice, and the first pressure sensor is used to collect the pressure acting in the rod cavity; a second pressure sensor is installed on the rear end pipe of the damping orifice, and the second pressure sensor is used to collect the pressure acting in the rodless cavity; a third pressure sensor is installed on the pipe of the high-temperature oil inlet, and the third pressure sensor is used to collect the high-temperature oil inlet pressure; a fourth pressure sensor is installed on the pipe of the high-temperature oil outlet, and the fourth pressure sensor is used to collect the high-temperature oil outlet pressure.

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