Flow control valve and flow resistance test bench with same

Abstract

The application provides a flow control valve and a flow resistance test bench with the same. The flow control valve comprises a valve body, a main valve core, a pilot valve core and a driver for driving the pilot valve core to move. The valve body is provided with an inlet, an outlet and a containing cavity. The main valve core divides the containing cavity into a second chamber and a first chamber. The main valve core is provided with a first channel which is communicated with the inlet and the outlet. The pilot valve core is provided with a second channel. The second channel is used for communicating the second chamber with the outlet and / or the first chamber with the outlet. The pilot valve core is movable relative to the main valve core to adjust the communication area S1 of the second channel with the second chamber and the communication area S2 of the second channel with the first chamber. When S1 is not equal to S2, the main valve core is movable relative to the valve body and the pilot valve core to reset to a state of S1=S2 and adjust the flow area of the first channel. The flow control valve disclosed by the application can reduce the influence of the driving power of the driver on the flow regulation range, and the flow regulation range is larger.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, specifically to a flow control valve and a flow resistance test bench having the same. Background Technology

[0002] In the field of fluid control, flow control valves are a key component used to regulate fluid flow. In related technologies, flow control valves typically use an actuator (motor) to move the valve core, thereby adjusting the valve opening and controlling the fluid flow. However, in this regulation process, the actuator needs to overcome the force exerted on the valve core by the fluid medium, and this force increases as the valve opening increases, correspondingly increasing the actuator's driving force. This means that the motor's driving power largely determines the range of flow regulation.

[0003] For the reasons mentioned above, this flow control valve has certain limitations in its flow regulation range. In applications requiring a wide range of flow regulation, insufficient driving force may prevent it from achieving the desired regulation effect. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, one embodiment of the invention provides a flow control valve that requires less drive power from the actuator, thereby reducing the impact of the actuator's drive power on the fluid flow rate adjustment range and resulting in a wider flow rate adjustment range.

[0005] The flow control valve disclosed in this invention includes:

[0006] The valve body is provided with an inlet, an outlet and a receiving cavity;

[0007] The main valve core divides the accommodating cavity into a second chamber and a first chamber. Both the second chamber and the first chamber are connected to the inlet. The main valve core is provided with a first channel for connecting the inlet and the outlet. The main valve core is slidable relative to the valve body to adjust the flow area of ​​the first channel.

[0008] A pilot valve core is movable relative to the valve body. The pilot valve core has a second channel for connecting the second chamber with the outlet and / or the first chamber with the outlet. The pilot valve core is movable relative to the main valve core to adjust the communication area S1 between the second channel and the second chamber and the communication area S2 between the second channel and the first chamber. The pilot valve core has a first state and a second state relative to the main valve core. In the first state, S1 ≠ S2, and in the second state, S1 = S2.

[0009] A driver is used to drive the pilot valve core to move, so that the pilot valve core is in a first state relative to the main valve core. In the first state, the main valve core is movable relative to the valve body and the pilot valve core, so that the main valve core is reset to a second state relative to the pilot valve core, and the flow area of ​​the first channel is adjusted.

[0010] In the flow control valve provided in this embodiment, the actuator can drive the pilot valve core to move to adjust S1 and S2, and then drive the main valve core to move under the action of the fluid pressure difference between the second chamber and the first chamber, so as to adjust the flow rate of the flow control valve. Furthermore, the pilot valve core is axially balanced, which requires less driving power from the actuator, thus reducing the impact of the actuator's driving power on the fluid flow rate adjustment range and resulting in a wider flow rate adjustment range.

[0011] In some embodiments, the pilot valve core and the valve body are connected by a thread, and the flow control valve further includes a coupling, one end of which is axially slidably connected to the output end of the driver, and the other end of which is connected to the pilot valve core.

[0012] In some embodiments, the driver is a stepper motor, which is electrically connected to the computer unit.

[0013] In some embodiments, the accommodating cavity is provided with a first opening and a second opening, the first opening communicating with the inlet and the second opening communicating with the outlet, the main valve core is provided with a first groove, the first groove and the side wall of the accommodating cavity defining the first channel, and the main valve core is movable relative to the valve body to adjust the misalignment area between the first groove and the first opening.

[0014] In some embodiments, the valve body includes a valve seat and a valve sleeve, the valve sleeve being disposed within the valve seat and defining the receiving cavity within the valve sleeve, the first opening and the second opening being axially spaced apart on the valve sleeve, the first opening having a plurality of uniformly arranged around the axis of the valve sleeve, and the second opening having a plurality of uniformly arranged around the axis of the valve sleeve.

[0015] In some embodiments, the valve seat has an inlet chamber and an outlet chamber. The inlet chamber is corresponding to the first opening, and the outlet chamber is corresponding to the second opening. The inlet chamber and the outlet chamber are arranged in a ring around the outside of the valve sleeve. The inlet chamber is used to connect the first opening and the inlet, and the outlet chamber is used to connect the second opening and the outlet.

[0016] In some embodiments, the valve body is further provided with a third channel and a fourth channel. The third channel is used to connect the liquid inlet chamber and the first chamber, and the fourth channel is used to connect the liquid inlet chamber and the second chamber. Both the third channel and the fourth channel are provided with throttling elements, and the throttling elements have throttling orifices for the fluid medium to pass through.

[0017] In some embodiments, the flow control valve further includes a plurality of sealing rings, which are respectively disposed between the valve sleeve and the main valve core, between the valve sleeve and the valve seat, and between the pilot valve core and the valve body.

[0018] In some embodiments, the main valve core has a through hole, the pilot valve core is movably inserted into the through hole, the pilot valve core has a second groove, the second groove and the inner wall of the through hole define a second channel, the main valve core is slidable relative to the pilot valve core to adjust the misalignment area between the second groove and the inner wall of the through hole; the main valve core also has a fifth channel, the fifth channel is used to connect the second channel and the first channel.

[0019] In one embodiment of the present invention, a flow resistance test bench is also provided, the flow resistance test bench including the flow control valve and the computer unit described above, the flow control valve being electrically connected to the computer unit. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the flow control valve provided in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of the flow control valve provided in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the valve body in the flow control valve provided in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the assembly of the valve seat and valve cover in the flow control valve provided in the embodiment of the present invention.

[0024] Figure 5 This is an assembly diagram of the main valve core and pilot valve core in the flow control valve provided in the embodiment of the present invention.

[0025] Figure label:

[0026] 1. Valve body; 11. Valve seat; 111. Inlet; 112. Outlet; 113. Liquid inlet chamber; 114. Liquid outlet chamber; 115. Mounting chamber; 12. Receiving chamber; 121. First chamber; 122. Second chamber; 123. First opening; 124. Second opening; 13. Guide block; 131. Threaded hole; 14. Valve sleeve; 15. Third channel; 151. First section; 152. Second section; 153. Third section; 16. Fourth channel; 161. Fourth section; 162. Fifth section; 17. Throttling element; 171. Throttling orifice; 18. Valve cover;

[0027] 2. Main valve core; 21. First channel; 211. First groove; 22. Through hole; 23. Fifth channel;

[0028] 3. Pilot valve core; 31. Second channel; 311. Second groove; 312. Groove opening;

[0029] 4. Driver; 41. Coupling; 411. First end; 412. Second end; 4121. Movable cavity; 42. Mounting base; 421. Hollow cavity;

[0030] 5. Sealing ring. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a flow control valve, which includes a valve body 1, a main valve core 2, a pilot valve core 3, and a driver 4. The valve body 1 has an inlet 111, an outlet 112, and a receiving cavity 12. The main valve core 2 is disposed within the receiving cavity 12 and divides the receiving cavity 12 into a first chamber 121 and a second chamber 122, both of which are connected to the inlet 111. The main valve core 2 has a first channel 21 for connecting the inlet 111 and the outlet 112, and the main valve core 2 is slidable relative to the valve body 1 to adjust the flow area of ​​the first channel 21. The pilot valve core 3 is slidable relative to the valve body 1 and has a second channel 31 for connecting the second chamber 122 with the inlet 111 and / or the first chamber 121 with the outlet 112.

[0033] Furthermore, the pilot valve core 3 is slidable relative to the main valve core 2 to adjust the communication area S1 between the second channel 31 and the second chamber 122 and the communication area S2 between the second channel 31 and the first chamber 121; the pilot valve core 3 has a first state and a second state relative to the main valve core 2. In the first state, S1 ≠ S2, and in the second state, S1 = S2; the driver 4 is used to drive the pilot valve core 3 to move, so that the pilot valve core 3 is in the first state relative to the main valve core 2. In the first state, the main valve core 2 is movable relative to the valve body 1 and the pilot valve core 3, so that the main valve core 2 is reset to the second state relative to the pilot valve core 3 and the flow area of ​​the first channel 21 is adjusted.

[0034] Specifically, during the operation of the flow control valve, the fluid medium can enter through inlet 111 and flow out through outlet 112. The first chamber 121 can be located to the right of the main valve core 2, and the second chamber 122 can be located to the left of the main valve core 2. Both the second chamber 122 and the first chamber 121 are connected to inlet 111, meaning the fluid medium at inlet 111 can flow into the second chamber 122 and the first chamber 121. Before the flow control valve is adjusted, the connecting areas S1 and S2 remain equal, so the force exerted by the fluid medium in the second chamber 122 and the first chamber 121 on the main valve core 2 remains equal. When the flow needs to be adjusted, the actuator 4 can drive the pilot valve core 3 to move to the right relative to the main valve core 2 so that S1 < S2. This increases the fluid pressure in the second chamber 122, increasing the force of the fluid medium in the second chamber 122 pushing the main valve core 2 to the right, while decreasing the fluid pressure in the first chamber 121. The force that pushes the main valve core 2 to the left decreases, so that the force exerted by the fluid medium in the second chamber 122 on the main valve core 2 is greater than the force exerted by the fluid medium in the first chamber 121 on the main valve core 2. As a result, the main valve core 2 moves to the right with the pilot valve core 3 until the connecting area S1 and the connecting area S2 become equal again, and the main valve core 2 no longer moves relative to the pilot valve core 3. In addition, during the movement of the main valve core 2 to the right relative to the valve body 1, the flow area of ​​the first channel 21 will also increase or decrease, thereby adjusting the flow rate of the flow control valve.

[0035] It should be noted that the actuation process of each component when the actuator 4 drives the pilot valve core 3 to move to the left is the opposite of the actuation process of each component when the pilot valve core 3 moves to the right, and will not be repeated here. Furthermore, in this embodiment, the inlet 111 is located to the left of the outlet 112. The movement of the main valve core 2 relative to the valve body 1 to the right increases the flow area of ​​the first channel 21, while the movement of the main valve core 2 relative to the valve body 1 to the left decreases the flow area of ​​the first channel 21.

[0036] Of course, in some other embodiments of the present invention, the main valve core 2 moving to the right relative to the valve body 1 can also reduce the flow area of ​​the first channel 21, and the main valve core 2 moving to the left relative to the valve body 1 can also increase the flow area of ​​the first channel 21.

[0037] As can be seen from the above, in the flow control valve provided in this embodiment, the driver 4 drives the pilot valve core 3 to move to adjust S1 and S2, and then drives the main valve core 2 to move under the action of the fluid pressure difference in the second chamber 122 and the first chamber 121 to adjust the flow rate of the flow control valve. Furthermore, the pilot valve core 3 is axially balanced, which requires less driving power from the driver 4. This avoids the driving power of the driver 4 from affecting the flow rate adjustment range, resulting in a larger flow rate adjustment range.

[0038] In some embodiments, the pilot valve core 3 and the valve body 1 may be configured to be threadedly connected. The flow control valve also includes a coupling 41, one end of which is axially slidably connected to the output shaft of the driver 4, and the other end of which is connected to the pilot valve core 3.

[0039] Furthermore, the valve body 1 is provided with a guide block 13, and the guide block 13 has a threaded hole 131. The guide block 13 is located on the right side of the valve body 1, and the actuator 4 is located on the right side of the valve body 1. The pilot valve core 3 is movably inserted into the threaded hole 131, and the pilot valve core 3 has a threaded section that mates with the threaded hole 131. The actuator 4 can drive the pilot valve core 3 to rotate through the coupling 41, and thus, under the action of the threaded connection, the pilot valve core 3 can move axially relative to the valve body 1. Moreover, the threaded connection allows for more precise movement of the pilot valve core 3, making it easier to control and helping to improve control accuracy.

[0040] The coupling 41 and the pilot valve core 3 can be hinged. For example, the pilot valve core 3 has a first shaft hole, the coupling 41 has a first end 411 and a second end 412, and the first end 411 of the coupling 41 has a second shaft hole. The first shaft hole and the second shaft hole can be connected by components such as pins or connecting pins, which not only facilitates disassembly and assembly but also withstands shear forces and provides greater freedom of movement.

[0041] The second end 412 of the coupling 41 is also provided with a movable cavity 4121. The output shaft of the driver 4 can slide back and forth in the movable cavity 4121. The side wall of the movable cavity 4121 is provided with a guide groove, which is arranged along the axial direction of the coupling 41. The output shaft of the driver 4 is provided with a slider that cooperates with the guide groove. This not only ensures that there is axial sliding between the coupling 41 and the output shaft, but also ensures that the coupling 41 and the output shaft can rotate synchronously. The structure is simple and the assembly is more convenient.

[0042] Furthermore, the driver 4 can be configured as a stepper motor, which can be electrically connected to the computer unit. That is, the operator can precisely control the rotation angle of the stepper motor through the computer unit, thereby controlling the movement of the pilot valve core 3, resulting in higher control precision and meeting various fine adjustment needs.

[0043] In this embodiment, the flow control valve also includes a mounting base 42, through which the driver 4 can be fixedly mounted to the valve body 1. A hollow cavity 421 is formed inside the mounting base 42. The ends of the coupling 41, the output shaft, and the pilot valve core 3 are all located inside the hollow cavity 421. That is, the mounting base 42 covers the outside of the coupling 41, which not only allows for the installation and fixing of the driver 4, but also ensures the cleanliness of the connection environment between the coupling 41 and the output shaft and between the coupling 41 and the pilot valve core 3, avoiding interference from external debris that could affect the transmission process.

[0044] like Figure 2 , Figure 3 and Figure 4 As shown, the accommodating cavity 12 is provided with a first opening 123 and a second opening 124. The first opening 123 communicates with the inlet 111, and the second opening 124 communicates with the outlet 112. The main valve core 2 is provided with a first groove 211. The first groove 211 and the side wall of the accommodating cavity 12 define a first channel 21. The main valve core 2 is movable relative to the valve body 1 to adjust the misalignment area between the first groove 211 and the first opening 123.

[0045] Specifically, the first groove 211 is an annular groove, and the first opening 123 is located to the left of the second opening 124. When the main valve core 2 moves to the right relative to the valve body 1, the offset area between the first groove 211 and the first opening 123 gradually increases, that is, the flow area of ​​the first channel 21 is larger, and more and more fluid medium can flow into the first groove 211 through the offset opening between the first opening 123 and the first groove 211, and then flow to the outlet 112 through the second opening 124. When the main valve core 2 moves to the left relative to the valve body 1, the offset area between the first groove 211 and the first opening 123 gradually decreases, that is, the flow area of ​​the first channel 21 gradually decreases, and the offset opening between the first opening 123 and the first groove 211 gradually decreases, and less and less fluid medium can flow into the first groove 211 through the offset opening between the first opening 123 and the first groove 211, thereby adjusting the flow rate of the fluid medium.

[0046] like Figure 3 and Figure 4As shown, the valve body 1 includes a valve seat 11 and a valve sleeve 14. The valve sleeve 14 is disposed inside the valve seat 11 and defines a receiving cavity 12 inside the valve sleeve 14. A first opening 123 and a second opening 124 are axially spaced on the valve sleeve 14. Multiple first openings 123 are evenly arranged around the axis of the valve sleeve 14, and multiple second openings 124 are evenly arranged around the axis of the valve sleeve 14. This allows the fluid medium to flow evenly into the first channel 21, reducing problems such as turbulence at a certain position that are not conducive to the flow of the fluid medium.

[0047] Optionally, the first opening 123 can be set to 4, 6, 8, or 9, etc., and the second opening 124 can be set to 6, 10, 12, or 15, etc. In this embodiment, the number of first openings 123 is less than the number of second openings 124, thereby achieving throttling and facilitating control of the discharge flow rate of the fluid medium.

[0048] like Figure 3 and Figure 4 As shown, the valve seat 11 has an inlet chamber 113 and an outlet chamber 114. The inlet chamber 113 is correspondingly arranged with the first opening 123, and the outlet chamber 114 is correspondingly arranged with the second opening 124. The inlet chamber 113 and the outlet chamber 114 are arranged in a ring on the outside of the valve sleeve 14. The inlet chamber 113 is used to connect the first opening 123 and the inlet 111, and the outlet chamber 114 is used to connect the second opening 124 and the outlet 112.

[0049] In this embodiment, the fluid medium can enter the inlet chamber 113 through the inlet 111, then enter the first channel 21 through the first opening 123, and then enter the outlet chamber 114 through the second opening 124, finally flowing out from the outlet 112. The first groove 211 is axially disposed on the main valve core 2, and the radial length of the first groove 211 can be greater than or equal to the axial distance between the farthest points on the first opening 123 and the second opening 124. That is, the fluid medium can flow into the first channel 21 completely unobstructed through the first opening 123 and flow out through the second opening 124, so as to ensure that the first channel 21 has the maximum flow rate.

[0050] Furthermore, the valve body 1 also includes a valve cover 18, a valve seat 11 having a mounting cavity 115 defined therein, a valve sleeve 14 being installed in the mounting cavity 115, the valve cover being used to seal the mounting cavity 115 to enclose the valve sleeve 14 within the mounting cavity 115, and a guide block 13 being detachably installed on the valve cover, thereby facilitating the installation, disassembly, and maintenance of each component.

[0051] like Figure 2 , Figure 3 and Figure 4As shown, the valve body 1 is also provided with a third channel 15 and a fourth channel 16. The third channel 15 is used to connect the liquid inlet chamber 113 and the first chamber 121, and the fourth channel 16 is used to connect the liquid inlet chamber 113 and the second chamber 122. Both the third channel 15 and the fourth channel 16 are provided with throttling elements 17. The throttling elements 17 have throttling orifices 171 for the fluid medium to pass through, thereby controlling and reducing the flow rate in the third channel 15 and the fourth channel 16, and avoiding the flow rate in the third channel 15 and the fourth channel 16 from affecting the flow rate regulation in the first channel 21.

[0052] Furthermore, the connection points of the third channel 15 and the inlet chamber 113 and the fourth channel 16 and the inlet chamber 113 are symmetrically located on the side wall of the inlet chamber 113 to ensure that the flow rate and pressure of the fluid medium passing through the third channel 15 and the fourth channel 16 are consistent, thereby enabling precise control of the position of the main valve core 2 in the accommodating cavity 12 and improving control accuracy.

[0053] It should be noted that the flow rate that can be passed through the third channel 15 and the fourth channel 16 is much smaller than that that can be passed through the first channel 21. For example, the flow rate that can be passed through the third channel 15 and the fourth channel 16 is 1 / 100 or 1 / 200 of the flow rate that can be passed through the first channel 21, etc. This makes it easier to achieve flow rate regulation and control and improve the control and regulation accuracy.

[0054] like Figure 3 As shown, the third channel 15 includes an axially arranged first segment 151, a radially arranged second segment 152, and an axially arranged third segment 153. The first segment 151, the second segment 152, and the third segment 153 are connected. The first segment 151 is positioned relative to the third segment 153 and close to the axis of the valve body 1. The second segment 152 can be mounted on the valve cover 18. The fluid medium in the inlet chamber 113 can flow into the first chamber 121 sequentially through the first segment 151, the second segment 152, and the third segment 153. The fourth channel 16 includes an axially arranged fourth segment 161 and a radially arranged fifth segment 162. The fourth segment 161 and the fifth segment 162 are connected. The fluid medium in the inlet chamber 113 can flow into the second chamber 122 sequentially through the fourth segment 161 and the fifth segment 162. The above arrangement facilitates the processing of the third channel 15 and the fourth channel 16, reduces processing difficulty, and improves production assembly efficiency.

[0055] Furthermore, the edge of the valve sleeve 14 is provided with several notches 141, through which the fourth channel 16 communicates with the second chamber 122. The fluid medium can enter the second chamber through the fourth channel 16 and the notches 141.

[0056] Optionally, the notches 141 can be set to 4, 6, or 8, and are evenly arranged around the axis of the valve sleeve 14 so that the fluid medium can enter the second chamber 122 evenly.

[0057] like Figure 2 and Figure 5 As shown, the main valve core 2 is provided with a through hole 22, and the pilot valve core 3 is movably inserted into the through hole 22. The pilot valve core 3 is provided with a second groove 311. The second groove 311 and the inner wall of the through hole 22 define a second channel 31. The main valve core 2 can slide relative to the pilot valve core 3 to adjust the misalignment area between the second groove 311 and the inner wall of the through hole 22.

[0058] Furthermore, the main valve core 2 is also provided with a fifth channel 23, which is a through hole that penetrates the main valve core 2 radially. The fifth channel 23 is used to connect the second channel 31 and the first channel 21 so that the fluid medium in the second channel 31 can flow into the drain chamber 114 through the fifth channel 23, and then flow to the outlet 112 through the inlet chamber 113.

[0059] In this embodiment, the second groove 311 is an annular groove, and the pilot valve core 3 is also provided with a plurality of slots 312, which can connect the space inside the second groove 311 with the second chamber 122 or the first chamber 121.

[0060] Optionally, the slots 312 can be set to 4, 6, or 8, and are evenly arranged around the axis of the pilot valve core 3 so that the fluid medium can enter the second groove 311 evenly.

[0061] If the pilot valve core 3 moves to the right relative to the valve body 1, the opening area of ​​the second groove 311 and the inner wall of the through hole 22 that are offset on the right side increases, and the fluid medium flowing into the second groove 311 through the right opening decreases. Consequently, the force exerted by the fluid medium in the first chamber 121 on the main valve core 2 to move to the left decreases. Meanwhile, the opening area of ​​the second groove 311 and the inner wall of the channel that are offset on the left side decreases or even disappears, which increases the force exerted by the fluid medium in the second chamber 122 on the main valve core 2 to move to the right. This enables the main valve core 2 to move to the right, allowing it to move synchronously with the pilot valve core 3. When adjusting the position of the pilot valve core 3, the position of the main valve core 2 can be adjusted, thereby regulating the flow rate of the flow control valve.

[0062] It should be noted that during normal operation of this flow control valve, a fluid medium is always flowing through the valve, and the second channel 31 and the second chamber 122, as well as the second channel 31 and the first chamber 121, remain in constant communication. When the pilot valve core 3 is adjusted, the main valve core 2 can also move quickly with the pilot valve core 3 under the influence of the difference in force applied between the second chamber 122 and the first chamber 121, making adjustment faster and more convenient to use.

[0063] In some embodiments, the flow control valve further includes a plurality of sealing rings 5, which are respectively disposed between the valve sleeve 14 and the main valve core 2, between the valve sleeve 14 and the valve seat 11, and between the pilot valve core 3 and the valve body 1.

[0064] Specifically, the valve sleeve 14 is provided with slots on both sides of the first opening 123, on both sides of the second opening 124, on both sides of the main valve core 2 in the first groove 211, and at the connection between the pilot valve core 3 and the valve body 1. The sealing ring 5 can be installed into the slot to ensure the sealing of the connection between the components and to prevent leakage of liquid medium.

[0065] In one embodiment of the present invention, a flow resistance test bench is also provided. This test bench includes the aforementioned flow control valve and computer unit, wherein the flow control valve is electrically connected to the computer unit. The flow resistance test bench primarily simulates fluid flow under actual operating conditions by adjusting the pressure and flow rate of the fluid supply system, and then measures the pressure loss during the fluid flow process within the test section to derive the flow resistance characteristics.

[0066] In addition, the flow control valve provided in the above embodiment can be applied to the flow resistance test bench. Therefore, the beneficial effects that the flow resistance test bench can achieve can be referred to the beneficial effects corresponding to the flow control valve provided above, and will not be repeated here.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flow control valve, characterized in that, The flow control valve includes: The valve body is provided with an inlet, an outlet and a receiving cavity; The main valve core divides the accommodating cavity into a second chamber and a first chamber. Both the second chamber and the first chamber are connected to the inlet. The main valve core is provided with a first channel for connecting the inlet and the outlet. The main valve core is slidable relative to the valve body to adjust the flow area of ​​the first channel. A pilot valve core is movable relative to the valve body. The pilot valve core has a second channel for connecting the second chamber with the outlet and the first chamber with the outlet. The pilot valve core is movable relative to the main valve core to adjust the communication area S1 between the second channel and the second chamber and the communication area S2 between the second channel and the first chamber. The pilot valve core has a first state and a second state relative to the main valve core. In the first state, S1 ≠ S2, and in the second state, S1 = S2. A driver is used to drive the pilot valve core to move, so that the pilot valve core is in a first state relative to the main valve core. In the first state, the main valve core is movable relative to the valve body and the pilot valve core, so that the main valve core is reset to a second state relative to the pilot valve core, and the flow area of ​​the first channel is adjusted. The main valve core has a through hole, and the pilot valve core is movably inserted into the through hole. The pilot valve core has a second groove, which, together with the inner wall of the through hole, defines a second channel. The main valve core is slidable relative to the pilot valve core to adjust the offset area between the second groove and the inner wall of the through hole. The main valve core also has a fifth channel, which connects the second channel and the first channel.

2. The flow control valve according to claim 1, characterized in that, The pilot valve core and the valve body are connected by a thread. The flow control valve also includes a coupling, one end of which is axially slidably connected to the output shaft of the driver, and the other end of which is connected to the pilot valve core.

3. The flow control valve according to claim 2, characterized in that, The driver is a stepper motor, which is electrically connected to the computer unit.

4. The flow control valve according to claim 1, characterized in that, The accommodating cavity is provided with a first opening and a second opening. The first opening is connected to the inlet, and the second opening is connected to the outlet. The main valve core is provided with a first groove. The first groove and the side wall of the accommodating cavity define the first channel. The main valve core is movable relative to the valve body to adjust the misalignment area between the first groove and the first opening.

5. The flow control valve according to claim 4, characterized in that, The valve body includes a valve seat and a valve sleeve. The valve sleeve is disposed inside the valve seat and defines the receiving cavity inside the valve sleeve. The first opening and the second opening are axially spaced on the valve sleeve. Multiple first openings are evenly arranged around the axis of the valve sleeve, and multiple second openings are evenly arranged around the axis of the valve sleeve.

6. The flow control valve according to claim 5, characterized in that, The valve seat has an inlet chamber and an outlet chamber. The inlet chamber is corresponding to the first opening, and the outlet chamber is corresponding to the second opening. The inlet chamber and the outlet chamber are arranged in a ring on the outside of the valve sleeve. The inlet chamber is used to connect the first opening and the inlet, and the outlet chamber is used to connect the second opening and the outlet.

7. The flow control valve according to claim 6, characterized in that, The valve body is also provided with a third channel and a fourth channel. The third channel is used to connect the liquid inlet chamber and the first chamber, and the fourth channel is used to connect the liquid inlet chamber and the second chamber. Both the third channel and the fourth channel are provided with throttling elements, and the throttling elements have throttling orifices for the fluid medium to pass through.

8. The flow control valve according to claim 5, characterized in that, The flow control valve also includes multiple sealing rings, which are respectively disposed between the valve sleeve and the main valve core, between the valve sleeve and the valve seat, and between the pilot valve core and the valve body.

9. A flow resistance test bench, characterized in that, The flow resistance test bench includes a flow control valve and a computer unit as described in any one of claims 1 to 8, wherein the flow control valve is electrically connected to the computer unit.

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