Proportional flow control valve

Abstract

The invention relates to the field of control valves, in particular to a proportional flow control valve which comprises a valve body shell, a valve element is slidably connected into the valve body shell, a hole is formed in the valve element, an electromagnet is fixedly installed on the outer side of the valve body shell and connected with the valve element, liquid through holes are formed in the two sides of the valve body shell, and the liquid through holes are communicated with the valve element. A sliding cavity is formed in the valve body shell, the liquid through holes in the two sides communicate with the sliding cavity, and the valve element is slidably connected into the sliding cavity. According to the flow control valve, the electromagnet pushes the valve element to move rapidly, liquid through holes in the two sides are communicated, the flow of the flow control valve is increased, the electromagnet continues to push the valve element to move and operate, the pushing assembly drives the valve element to move slowly, and the overlapping area between the valve element and the side flow holes is controlled accurately; and after the electromagnet moves by a set distance, the moving distance of the valve element is reduced through the pushing assembly, so that the flow control valve ensures the precision of an execution part while ensuring the efficiency of the execution part.

Description

Technical Field

[0001] The present invention relates to the field of control valves, in particular to a proportional flow control valve. Background Art

[0002] A control valve is a key actuator used in industrial systems to regulate fluid flow, pressure, and temperature. It receives control signals to drive the valve core, changing the cross-sectional area of ​​the flow channel, thereby achieving control of process parameters.

[0003] A proportional flow control valve is a control valve that proportionally adjusts the flow of a gas or liquid via an electrical signal. Unlike traditional on-off flow control valves, proportional valves can achieve infinitely variable flow control. However, in actual use, this infinitely variable flow control requires the use of permanent magnet electromagnets or high-precision motors instead of conventional electromagnets and motors, increasing the overall cost of the product. Patent application CN118462839B provides an air flow control valve that uses a motor to drive a lead screw sleeve and a zero-position probe for linear motion, thereby adjusting the outlet area of ​​the air outlet of the inlet and outlet cavities. This structure can effectively ensure the accuracy of the control valve while maintaining production costs. However, to ensure accuracy, the flow control valve requires minimizing the movement of the valve core. In some production processes, the control valve needs to first push a large flow rate and then push a small flow rate for precise push, thereby ensuring the efficiency and accuracy of the flow control valve.

[0004] Therefore, a proportional flow control valve is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a proportional flow control valve to solve the problem of increased control valve cost caused by stepless regulation, and also to solve the problem of flow control valve flow pushing efficiency while ensuring the accuracy of the flow control valve.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A proportional flow control valve comprises a valve body shell, a valve core is slidably connected to the valve body shell, a hole is provided on the valve core, an electromagnet is fixedly installed on the outside of the valve body shell, the electromagnet and the valve core are connected to each other, liquid holes are provided on both sides of the valve body shell, a sliding chamber is provided in the valve body shell, the liquid holes on both sides are communicated with the sliding chamber, the valve core is slidably connected in the sliding chamber, two symmetrically arranged side flow holes are provided on the inner wall of the sliding chamber, the side flow holes are connected to the liquid hole, a pushing component is provided between the valve core and the electromagnet, and when the electromagnet is running, the electromagnet pushes the valve core to move quickly through the pushing component. After a set time, the pushing component abuts against the inner wall of the valve body shell, and pushes the valve core to move slowly through the pushing component.

[0008] The proportional flow control valve can perform stepless control of the flow rate. The controller sends an analog signal (such as -V) or a digital signal (PWM) to drive the proportional solenoid to operate. The solenoid generates a force proportional to the signal to push the valve core to move, changing the overlapping area between the hole of the valve core and the liquid hole. The valve core displacement and flow rate are usually linear or in a specific curve relationship, so the larger the overlapping area, the greater the flow rate. Specifically, when the liquid enters the liquid hole on the other side through the liquid hole on one side, the valve core needs to be moved to the specified position. The electromagnet pushes the valve core to move quickly by pushing the assembly to connect the liquid holes on both sides. Of course, when a small flow rate needs to be controlled, the control valve The distance the core moves is sufficient. At this time, the flow control valve allows the liquid to flow out normally, and only a large flow rate is discharged through the liquid hole on one side. When a small flow rate is required for precise discharge, the electromagnet continues to drive the valve core to move through the pushing component until the pushing component contacts the inner wall of the sliding chamber, triggering the pushing component and driving the valve core to move slowly, accurately controlling the overlapping area between the valve core and the side flow hole, and changing the movement accuracy of the valve core during operation by pushing the component, so that after the electromagnet moves the set distance, the moving speed of the valve core is reduced by the pushing component. The flow control valve ensures the accuracy of flow push while ensuring the efficiency of flow push.

[0009] Preferably, the pushing assembly includes a piston cylinder, a large piston plate, a first piston rod, a small piston plate, a second piston rod, and a first compression spring. Two piston cylinders are provided in the sliding chamber, and the two piston cylinders are connected to each other and fixedly installed. A large piston plate is slidably connected in the piston cylinder on one side, and one end of the large piston plate is fixedly installed with the first piston rod. One end of the first piston rod extends out of the piston cylinder and is rotatably connected to the valve core on one side, and a small piston plate is slidably connected in the piston cylinder on the other side. One end of the small piston plate is fixedly installed with the second piston rod, one end of the second piston rod extends out of the piston cylinder and is installed with an electromagnet on one side. The inner diameters of the two piston cylinders are different. The piston cylinder on the side with the larger inner diameter is arranged on the side close to the valve core. The piston cylinder is filled with piston oil. A first compression spring sleeved on the first piston rod is in contact between the valve core and the piston cylinder. An unlocking member is installed on the piston cylinder, and the unlocking member is connected to the valve body shell and the second piston rod. The unlocking member abuts against the inner wall of the valve body shell, so that the electromagnet pulls the second piston rod to move.

[0010] When the solenoid valve pulls the pushing assembly to the specified position, the unlocking part triggers the pushing assembly, making the piston cylinder unable to move. Because the electromagnet is fixed to the second piston rod on one side, the electromagnet will continue to move. The moving electromagnet will pull the second piston rod to continue moving, causing the small piston plate connected to the second piston rod to move, and extract the liquid in the piston cylinder on one side. Because the two piston cylinders are connected to each other, the liquid in the piston cylinder on the other side can be extracted by extraction, so that the large piston plate on the other side is pulled and the valve core is driven to move through the first piston rod fixed on one side. Of course, the piston cylinder aperture corresponding to the small piston plate is smaller than the aperture on the other side, so that after the small piston plate moves a certain distance, the large piston plate on the other side can only move a shorter distance than the small piston plate, so that the valve core moves a shorter distance after the electromagnet moves the corresponding distance. By moving a shorter distance, the accuracy of the flow control valve when pushing the flow is ensured.

[0011] Preferably, the unlocking member includes a locking column, a second compression spring, a locking block, and a pressing column. A locking hole is provided on the second piston rod, a locking column is slidably connected to the locking hole, a second compression spring that abuts the locking column is placed in the locking hole, a locking block is fixedly mounted on the piston cylinder, a through hole is provided on the locking block, a pressing column is slidably connected to the through hole, one end of the pressing column abuts the locking column, a slideway connected to the locking hole is provided on one side of the locking block, and the end of the locking column close to the pressing column is semicircular.

[0012] It should be noted that because one end of the second piston rod is connected to the electromagnet and the other end is connected to the valve core, when the second piston rod is not limited, the operation of the solenoid valve will drive the second piston rod on one side to move, and a certain amount of piston fluid is stored in the piston cylinder. Therefore, when the small piston plate moves, it will drive the large plate on one side to move. It is necessary to use an unlocking piece to open the valve core after it opens the liquid hole and continues to move, so as to avoid the inability to close the liquid hole quickly when it needs to be closed, resulting in the inability to discharge quantitatively. Specifically, the locking column sliding on the second piston rod extends into the through hole on the locking block, so the second piston rod will remain in a relatively fixed state and will not slide on the piston cylinder due to the pull of the electromagnet, and the electromagnet drives the valve core to move When the locking pin is pressed against the second piston rod, the locking pin is pressed against the second piston rod, and the second compression spring in the locking hole is squeezed. The locking pin slides on the second piston rod, causing the second piston rod to slide normally. Of course, after the valve core returns to its original position, the first spring will push the first piston plate back to its original position, that is, the second piston rod returns to its original position. Of course, because the end of the locking pin close to the pressing pin is semicircular, the locking pin can return to the locking hole through the slide. The unlocking part can only be used to trigger the pushing component when it moves to the specified position, avoiding the long-term triggering of the pushing component, resulting in the flow control valve being closed for too long, thereby indirectly improving the accuracy of the flow control valve when pushing flow.

[0013] Preferably, two symmetrically arranged guide grooves are provided on the inner wall of the sliding chamber, a plurality of grooves are provided on the valve core, balls are provided in the grooves, and a plurality of the balls are connected in a rolling manner in the guide grooves. The front half of the guide groove is arranged in a straight line, and the rear half of the guide groove is arranged in an arc shape. When the valve core slides to the top of the arc groove, the side flow hole is staggered from the hole provided on the valve core.

[0014] The ball installed on the valve core enables the valve core to move along the guide groove. The guide groove prevents the valve core from swinging during the movement, avoiding the hole on the valve core and the liquid hole completely coinciding with the axis of the hole and the axis of the liquid hole not being in a coincident position, thereby interfering with the normal liquid flow of the flow control valve. Of course, the front half of the guide groove is set in a straight line, so that the valve core can only move in a straight line. Of course, the second half of the guide groove is set in an arc shape. The arc-shaped guide groove allows the valve core to rotate to a certain extent after moving to one side, so that the hole on the valve core can be rotated when it moves to the position of the side flow hole, thereby further improving the accuracy of the valve core movement.

[0015] Preferably, a restoration groove is provided on the inner wall of the sliding chamber, one end of the restoration groove is connected to the straight end of the guide groove, and the other end of the restoration groove is connected to the arc groove. A swing plate is rotatably connected to the restoration groove, and the swing plate is arranged at the connection between the restoration groove and the straight groove.

[0016] It should be noted that because the electromagnet pulls the valve core to open, the electromagnet needs to be powered off when closing, and the moving valve core will return to its original position. The hole of the valve core will be connected to the liquid hole during the process of moving back to its original position, resulting in excess liquid being discharged after the flow control valve has completed draining. Therefore, it is necessary to avoid the valve core from moving directly back to its original position, and the flow control valve needs to maintain a rotating state and gradually return to its original position. Specifically, after the valve core is rotated by a specified angle through the ball, it cannot continue to move. The set recovery groove prevents the valve core from moving through the guide groove during the back movement, and it needs to pass through the recovery groove. However, the recovery groove prevents the hole of the valve core from overlapping with the liquid hole when it moves back to its original position, thereby avoiding excess liquid discharge when the flow control valve is closed, and improving the accuracy of the flow control valve in pushing flow.

[0017] Preferably, an annular groove is provided on the valve core. When the valve core is in place, the annular groove is arranged around the liquid hole. A rubber sleeve is fixedly installed on the annular groove. A cylindrical cavity is provided at one end of the valve core. A piston is slidably connected to the cylindrical cavity. A pipe connected to the rubber sleeve is provided on the valve core.

[0018] It should be noted that because the valve core needs to move and rotate continuously, the sealing structure on the valve core is prone to wear, resulting in side leakage of the flow control valve. The use of a rubber sleeve can further seal the liquid hole, but long-term use will cause severe wear of the rubber sleeve. Therefore, it is necessary to avoid excessive contact between the rubber sleeve and the inner wall of the sliding cavity during the movement of the valve core, and the rubber sleeve needs to be in close contact with the sliding cavity when the valve core stops. Specifically, the piston member includes a piston block sliding in the cylindrical cavity and a piston rod connected thereto. When the valve core moves to one side to close the flow control valve, The moving valve core drives the piston to move, so that one end of the piston rod presses against the inner wall of the sliding chamber, allowing the gas in the cylindrical chamber to rush into the rubber sleeve, causing the rubber sleeve to expand continuously and press tightly against the inner wall of the sliding chamber to maintain the sealing of the flow control valve. Of course, when the flow control valve is opened, the valve core moves to the other side, and the moving valve core drives the piston rod away from the inner wall of the sliding chamber, so that the air squeezed in the rubber sleeve returns to the cylindrical chamber. The rubber sleeve shrinks to a certain extent to facilitate the movement of the valve core and avoid large wear during the movement, which affects the accuracy of the flow control valve during long-term use.

[0019] Preferably, a protrusion is provided in the sliding chamber. When the hole opened on the valve core coincides with the liquid hole, the piston cylinder close to the valve core side abuts against the protrusion, and the pressing column slides on the protrusion. By setting the protrusion, the piston cylinder cannot move after moving to the specified position, so that the pushing component can operate. However, it should be noted that when the pushing component is operated in advance, the slowly moving valve core will greatly affect the efficiency of the flow control valve. Therefore, it is necessary to trigger it at the most appropriate position, that is, when the hole opened on the valve core is about to coincide with the liquid hole, the piston cylinder on one side abuts against the protrusion, which maximizes the operating efficiency of the flow control valve while ensuring the accuracy of the flow control valve when pushing the flow.

[0020] A flow channel is provided between the side flow hole and the liquid through hole, and a filter is fixedly installed in the flow channel. The filter is placed on the side of the flow channel near the liquid through hole. Because the side flow hole on one side is very small, if the liquid passing through contains some particles, it will cause the flow metering hole to become clogged, making it impossible to continue to use. Therefore, it is necessary to install a filter on the side of the flow channel near the liquid through hole to allow particles to flow directly through the liquid through hole on the side with a larger hole, further extending the service life of the flow control valve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The electromagnet pushes the valve core to move quickly, connecting the liquid holes on both sides to increase the flow of the flow control valve. The electromagnet continues to push the valve core to move and promote the operation, so that the pushing component drives the valve core to move slowly, accurately controlling the overlapping area between the valve core and the side flow hole. After the electromagnet moves the set distance, the moving distance of the valve core is reduced by pushing the component. The flow control valve ensures the flow push efficiency while ensuring the accuracy of the flow push.

[0023] 2. Because the moving valve core will return to its original position, the hole of the valve core will be connected with the liquid hole during the process of moving back to its original position, resulting in excess liquid being discharged after the flow control valve completes discharging. The movement state of the valve core is changed by the guide groove and the recovery groove, so that the hole of the valve core will not overlap with the liquid hole when the valve core moves back to its original position, thereby avoiding excess liquid discharge when the flow control valve is closed, and indirectly improving the accuracy of the flow control valve flow push.

[0024] 3. When the push assembly is put into operation in advance, the slowly moving valve core will greatly affect the efficiency of the flow control valve, so it is necessary to trigger it at the most appropriate position, that is, when the hole opened on the valve core and the liquid hole are about to coincide, the piston cylinder on one side abuts against the protrusion, thereby maximizing the operating efficiency of the flow control valve and ensuring the accuracy of the flow control valve when pushing the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure at AA in the middle;

[0027] Figure 3 Schematic diagram of the internal structure of the valve body shell in the present invention;

[0028] Figure 4 Schematic diagram of the internal structure of the sliding chamber in the present invention;

[0029] Figure 5 Schematic diagram of the overall structure of the piston cylinder in the present invention;

[0030] Figure 6 for Figure 5 Schematic diagram of the structure at point A.

[0031] In the figure: 1. valve body shell; 2. liquid hole; 3. electromagnet; 4. valve core; 5. ball; 6. first compression spring; 7. hole; 8. side flow hole; 9. filter screen; 10. guide groove; 101. linear groove; 102. arc groove; 11. recovery groove; 12. sliding chamber; 13. first piston rod; 14. piston cylinder; 15. large piston plate; 16. small piston plate; 17. second piston rod; 18. protrusion; 19. annular groove; 20. rubber sleeve; 21. piston member; 22. locking block; 23. locking column; 24. pressing column; 25. second compression spring; 26. locking hole; 27. through hole; 28. slideway; 29. ​​diversion channel. DETAILED DESCRIPTION

[0032] See also Figures 1 to 6 The present invention provides a proportional flow control valve, the technical solution is as follows:

[0033] A proportional flow control valve, see Figure 1 、 Figure 2 and Figure 4, including a valve body shell 1, a valve core 4 is slidably connected in the valve body shell 1, a hole 7 is opened on the valve core 4, an electromagnet 3 is fixedly installed on the outside of the valve body shell 1, the electromagnet 3 and the valve core 4 are connected to each other, liquid holes 2 are opened on both sides of the valve body shell 1, a sliding chamber 12 is opened in the valve body shell 1, the liquid holes 2 on both sides are connected to the sliding chamber 12, the valve core 4 is slidably connected in the sliding chamber 12, two symmetrically arranged side flow holes 8 are opened on the inner wall of the sliding chamber 12, the side flow holes 8 are connected to the liquid hole 2, two piston cylinders 14 are provided in the sliding chamber 12, the two piston cylinders 14 are connected to each other and fixedly installed, and a large piston is slidably connected in the piston cylinder 14 on one side. Plate 15, one end of the large piston plate 15 is fixedly mounted with the first piston rod 13, one end of the first piston rod 13 extends to the outside of the piston cylinder 14 and is rotatably connected to the valve core 4 on one side, and a small piston plate 16 is slidably connected in the piston cylinder 14 on the other side, and one end of the small piston plate 16 is fixedly mounted with the second piston rod 17, one end of the second piston rod 17 extends to the outside of the piston cylinder 14 and is mounted on the electromagnet 3 on one side, the inner diameters of the two piston cylinders 14 are different, and the piston cylinder 14 on the side with the larger inner diameter is arranged on the side close to the valve core 4, the piston cylinder 14 is filled with piston oil, and a first compression spring 6 sleeved on the first piston rod 13 is in contact between the valve core 4 and the piston cylinder 14.

[0034] See also Figure 5 and Figure 6 A locking hole 26 is provided on the second piston rod 17, and a locking column 23 is slidably connected in the locking hole 26. A second compression spring 25 that abuts the locking column 23 is placed in the locking hole 26. A locking block 22 is fixedly mounted on the piston cylinder 14, and a through hole 27 is provided on the locking block 22. A pressing column 24 is slidably connected in the through hole 27, and one end of the pressing column 24 abuts against the locking column 23. A slideway 28 communicating with the locking hole 26 is provided on one side of the locking block 22. A protrusion 18 is provided in the sliding chamber 12. When the hole provided on the valve core 4 coincides with the liquid through hole 2, the piston cylinder 14 close to the side of the valve core 4 abuts against the protrusion 18, and the pressing column 24 slides on the protrusion 18.

[0035] See also Figure 2 and Figure 3 Two symmetrically arranged guide grooves 10 are provided on the inner wall of the sliding chamber 12, and a plurality of grooves are provided on the valve core 4. Balls 5 are provided in the grooves, and a plurality of balls 5 are rollingly connected in the guide groove 10. The front half of the guide groove 10 is a straight line setting, and the rear half of the guide groove 10 is an arc setting. When the valve core 4 slides to the top of the arc groove 102, the side flow hole 8 is staggered with the hole provided on the valve core 4. A restoration groove 11 is provided on the inner wall of the sliding chamber 12, and one end of the restoration groove 11 is connected to the straight end of the guide groove 10, and the other end of the restoration groove 11 is connected to the arc groove 102. A swing plate is rotatably connected to the restoration groove 11, and the swing plate is provided at the connection between the restoration groove 11 and the straight groove 101.

[0036] See also Figure 3 An annular groove 19 is provided on the valve core 4. When the valve core 4 is in place, the annular groove 19 is arranged around the liquid hole 2. A rubber sleeve 20 is fixedly installed on the annular groove 19. A cylindrical cavity is provided at one end of the valve core 4. A piston member 21 is slidably connected in the cylindrical cavity. A pipe communicating with the rubber sleeve 20 is provided on the valve core 4. A diversion channel is provided between the side flow hole 8 and the liquid hole 2. A filter screen 9 is fixedly installed in the diversion channel. The filter screen 9 is arranged on the side of the diversion channel close to the liquid hole 2.

[0037] See also Figure 1 and Figure 2 When in use, the controller sends an analog signal (such as 0-10V) or a digital signal (PWM) to drive the proportional solenoid 3 to operate. The solenoid 3 generates a force proportional to the signal, pushing the valve core 4 to move, changing the overlapping area between the valve core hole 7 and the liquid hole 2. The hydraulic oil can flow quickly through the hole of the liquid hole 2, so that the control valve can control the actuator to operate quickly.

[0038] See also Figure 4 、 Figure 5 and Figure 6 , and when the actuator moves for a period of time and needs to operate slowly and accurately, the electromagnet 3 pulls the piston cylinder 14 to the specified position, and the sliding locking column 23 on the second piston rod 17 extends into the through hole 27 on the locking block 22, so the second piston rod 17 will remain in a relatively fixed state and will not slide on the piston cylinder 14 due to the pulling of the electromagnet 3. The electromagnet 3 drives the valve core 4 to move. When the pressing column 24 moves to the protrusion 18 on one side, the protrusion 18 will squeeze the pressing column 24, so that the locking column 23 on one side will move out and lock the locking hole 26. The second compression spring 25 is squeezed, and the locking column 23 slides on the second piston rod 17, so that the second piston rod 17 can slide normally. By setting the protrusion 18, the piston cylinder 14 cannot move after moving to the specified position, so that the pushing component can operate. However, it should be noted that when the pushing component is operated in advance, the slowly moving valve core 4 will greatly affect the efficiency of the flow control valve, so it is necessary to trigger it at the most appropriate position, that is, when the hole opened on the valve core 4 is about to coincide with the liquid hole 2, the piston cylinder 14 on one side abuts against the protrusion 18.

[0039] See also Figure 2 and Figure 4, because the electromagnet 3 is fixedly installed with the second piston rod 17 on one side, and the electromagnet 3 will continue to move, the moving electromagnet 3 will pull the second piston rod 17 to continue moving, causing the small piston plate 16 connected to the second piston rod 17 to move, and the liquid in the piston cylinder 14 on one side is extracted. Because the two piston cylinders 14 are connected to each other, the liquid in the piston cylinder 14 on the other side can be extracted by extraction, so that the large piston plate 15 on the other side is pulled, and the valve core 4 is driven to move through the first piston rod 13 fixed on one side. Of course, the aperture of the piston cylinder 14 corresponding to the small piston plate 16 is smaller than the aperture on the other side, so that after the small piston plate 16 moves a certain distance, the large piston plate 15 on the other side can only move a shorter distance than the small piston plate 16, so that after the electromagnet 3 moves a corresponding distance, the valve core 4 moves a shorter distance. By moving a shorter distance, the flow control valve pushes the flow more accurately.

[0040] See also Figure 3 Because the side flow hole 8 on one side is very small, once the liquid passing through contains some particles, the flow measuring hole will be blocked and cannot be used anymore. Therefore, it is necessary to set a filter screen 9 on the side of the diversion channel close to the liquid hole 2, so that the particles can flow directly through the liquid hole 2 with a larger hole on one side, thereby further improving the service life of the flow control valve.

[0041] See also Figure 3 and Figure 4The ball 5 installed on the valve core 4 enables the valve core 4 to move along the guide groove 10. The guide groove 10 prevents the valve core 4 from swinging during the movement, so as to avoid the hole on the valve core 4 completely coinciding with the liquid through hole 2. The axis of the hole is not in the coinciding position with the axis of the liquid through hole 2, which interferes with the normal liquid flow of the flow control valve. Of course, the front half of the guide groove 10 is a straight line setting, so that the valve core 4 can only move in a straight line. Of course, the second half of the guide groove 10 is an arc setting. The arc-shaped guide groove 10 allows the valve core 4 to rotate to a certain extent after moving to one side, so that the hole on the valve core 4 can rotate when it moves to the position of the side flow hole 8, thereby further improving the accuracy of the movement of the valve core 4. At the same time, because the electromagnet 3 pulls the valve core 4 to open After that, when closing, the electromagnet 3 needs to be powered off, and the moving valve core 4 will return to its original position. The hole of the valve core 4 will be connected with the liquid hole 2 during the process of moving back to its original position, resulting in excess liquid being discharged after the flow control valve has completed draining. Therefore, it is necessary to avoid the valve core 4 from moving back to its original position directly, and the flow control valve needs to maintain a rotating state and then gradually return to its original position. After the valve core 4 rotates a specified angle through the ball 5, it cannot continue to move. The set recovery groove 11 makes it impossible for the valve core 4 to move through the guide groove 10 during the back movement, and it needs to pass through the recovery groove 11. However, the recovery groove 11 prevents the hole of the valve core 4 from overlapping with the liquid hole 2 when it moves back to its original position, thereby avoiding excess flow discharge when the flow control valve is closed.

[0042] See also Figure 4 and Figure 6 Of course, after the valve core 4 returns to its original position, the first spring will push the first piston plate back to its original position, that is, the second piston rod 17 returns to its original position. Of course, because the end of the locking column 23 close to the pressing column 24 is semicircular, the locking column 23 can return to the locking hole 26 through the slide 28. At the same time, the piston member 21 includes a piston block sliding in the cylindrical cavity and a piston rod connected thereto. When the valve core 4 moves to one side to close the flow control valve, the moving valve core 4 drives the piston member 21 to move, so that the piston rod One end is against the inner wall of the sliding chamber 12, allowing the gas in the cylindrical cavity to rush into the rubber sleeve 20, so that the rubber sleeve 20 continues to expand and tightly presses against the inner wall of the sliding cavity to maintain the sealing of the flow control valve. Of course, when the flow control valve is opened, the valve core 4 moves to the other side, and the moving valve core 4 drives the piston rod away from the inner wall of the sliding cavity, so that the air squeezed in the rubber sleeve 20 returns to the cylindrical cavity. The rubber sleeve 20 produces a certain contraction to facilitate the movement of the valve core 4 and avoid it from causing large wear during the movement.

[0043] A specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiment described above. For those skilled in the art, various changes, modifications, substitutions, and variations to these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A proportional flow control valve, comprising a valve body housing (1), a valve core (4) slidably connected to the valve body housing (1), a hole (7) formed on the valve core (4), an electromagnet (3) fixedly mounted on the outside of the valve body housing (1), the electromagnet (3) and the valve core (4) being connected to each other, and liquid holes (2) formed on both sides of the valve body housing (1), characterized in that: A sliding chamber (12) is provided in the valve body shell (1), and the liquid holes (2) on both sides are connected to the sliding chamber (12). The valve core (4) is slidably connected in the sliding chamber (12). Two symmetrically arranged side flow holes (8) are provided on the inner wall of the sliding chamber (12), and the side flow holes (8) are connected to the liquid hole (2). A pushing component is provided between the valve core (4) and the electromagnet (3). When the electromagnet (3) is running, the electromagnet (3) pushes the valve core (4) to move quickly through the pushing component. After a set time, the pushing component abuts against the inner wall of the valve body shell (1), and pushes the valve core (4) to move slowly through the pushing component.

2. A proportional flow control valve according to claim 1, characterized in that: The pushing assembly includes a piston cylinder (14), a large piston plate (15), a first piston rod (13), a small piston plate (16), a second piston rod (17), and a first compression spring (6). Two piston cylinders (14) are provided in the sliding chamber (12). The two piston cylinders (14) are interconnected and fixedly installed. A large piston plate (15) is slidably connected in the piston cylinder (14) on one side. One end of the large piston plate (15) is fixedly installed with the first piston rod (13). One end of the first piston rod (13) extends to the outside of the piston cylinder (14) and is rotatably connected to the valve core (4) on one side. A small piston plate (16) is slidably connected in the piston cylinder (14) on the other side. One end of the small piston plate (16) is fixedly installed. A second piston rod (17) is installed, one end of the second piston rod (17) extends outside the piston cylinder (14) and is installed with the electromagnet (3) on one side. The inner diameters of the two piston cylinders (14) are different. The piston cylinder (14) with the larger inner diameter is arranged on the side close to the valve core (4). The piston cylinder (14) is filled with piston oil. A first compression spring (6) sleeved on the first piston rod (13) is in contact between the valve core (4) and the piston cylinder (14). An unlocking member is installed on the piston cylinder (14). The unlocking member is connected to the valve body shell (1) and the second piston rod (17). The unlocking member is in contact with the inner wall of the valve body shell (1), so that the electromagnet (3) pulls the second piston rod (17) to move.

3. A proportional flow control valve according to claim 2, characterized in that: The unlocking member includes a locking column (23), a second compression spring (25), a locking block (22), and a pressing column (24). A locking hole (26) is provided on the second piston rod (17). A locking column (23) is slidably connected in the locking hole (26). A second compression spring (25) is placed in the locking hole (26) and abuts against the locking column (23). A locking block (22) is fixedly installed on the piston cylinder (14). A through hole (27) is provided on the locking block (22). A pressing column (24) is slidably connected in the through hole (27). One end of the pressing column (24) abuts against the locking column (23). A slideway (28) connected to the locking hole (26) is provided on one side of the locking block (22).

4. A proportional flow control valve according to claim 3, characterized in that: Two symmetrically arranged guide grooves (10) are provided on the inner wall of the sliding chamber (12), a plurality of grooves are provided on the valve core (4), balls (5) are provided in the grooves, and a plurality of balls (5) are rollingly connected in the guide groove (10), the front half of the guide groove (10) is a straight groove (101), and the rear half of the guide groove (10) is an arc groove (102), and when the valve core (4) slides to the top of the arc groove (102), the side flow hole (8) is staggered with the hole provided on the valve core (4).

5. A proportional flow control valve according to claim 4, characterized in that: A restoration groove (11) is provided on the inner wall of the sliding chamber (12), one end of the restoration groove (11) is connected to the straight end of the guide groove (10), and the other end of the restoration groove (11) is connected to the arc groove (102). A swing plate is rotatably connected to the restoration groove (11), and the swing plate is arranged at the connection point between the restoration groove (11) and the straight groove (101).

6. A proportional flow control valve according to claim 5, characterized in that: The valve core (4) is provided with an annular groove (19). When the valve core (4) is in its original position, the annular groove (19) is arranged around the liquid hole (2). A rubber sleeve (20) is fixedly installed on the annular groove (19). A cylindrical cavity is provided at one end of the valve core (4). A piston member (21) is slidably connected in the cylindrical cavity. A pipeline communicating with the rubber sleeve (20) is provided on the valve core (4).

7. A proportional flow control valve according to claim 2, characterized in that: A protrusion (18) is provided in the sliding chamber (12). When the hole formed on the valve core (4) coincides with the liquid hole (2), the piston cylinder (14) on the side close to the valve core (4) abuts against the protrusion (18), and the pressing column (24) slides on the protrusion (18).

8. The proportional flow control valve according to claim 1, characterized in that: A flow guide channel (29) is provided between the side flow hole (8) and the liquid through hole (2), a filter screen (9) is fixedly installed in the flow guide channel (29), and the filter screen (9) is arranged on one side of the flow guide channel close to the liquid through hole (2).

Images