A flow control valve for a chemical pipeline

Abstract

The present invention relates to the field of valve technology, and in particular to a flow control valve for a chemical pipeline, comprising a valve body, a valve seat, a valve core, an adjusting ring and a sealing plate. The valve seat is installed in the valve body, and the valve core and the valve seat are slidingly sealed. The adjusting ring and the valve core are slidingly sealed, and the adjusting ring can move and abut against the sealing plate. The flow control valve for a chemical pipeline of the present invention divides the movement of the adjusting ring into a first stroke and a second stroke. In the first stroke, the adjusting ring moves synchronously with the valve core, and the valve core works normally to achieve water flow and flow regulation. In the second stroke, the adjusting ring moves to abut against the sealing plate. At this time, the adjusting ring moves relative to the valve core, and the water flow inside the valve core is squeezed out in the reverse direction, and the valve core is backflushed and cleaned. There is no need to disassemble the valve core, which reduces maintenance costs and enables the flow control valve to be used normally.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a flow control valve for a chemical pipeline. Background Art

[0002] In chemical production, flow control valves are core components of pipeline systems, and their performance directly impacts reaction efficiency and production safety. A flow control valve controls the velocity and flow rate of fluids in a pipeline. It achieves precise flow control by incorporating a porous mesh structure into the valve core. Generally speaking, a wider opening for a flow control valve increases flow; conversely, a narrower opening reduces flow.

[0003] However, when the flow control valve is in operation, the holes on the valve core are prone to clogging, affecting the normal use of the flow control valve. To ensure the normal use of the flow control valve, the existing technology usually adopts the method of manual disassembly and cleaning to clean the valve core. However, manual disassembly and cleaning requires the valve to be removed from the pipeline, which has high maintenance costs per time. Frequent disassembly can easily cause valve core wear and shorten the valve life. Summary of the Invention

[0004] The present invention provides a flow control valve for a chemical pipeline to solve the problem that the hole net on the existing valve core is inconvenient to clean after being clogged and needs to be disassembled from the pipeline, which affects the normal use of the flow control valve and easily causes the valve core to wear, thereby shortening the valve life.

[0005] A flow control valve for a chemical pipeline of the present invention adopts the following technical solution: a flow control valve for a chemical pipeline, comprising a valve body, a valve seat, a valve core, an adjusting ring and a sealing plate; an inlet and an outlet are provided on the valve body, water can enter the valve body from the inlet side and flow out through the outlet, and the direction of water flowing from the inlet to the outlet side is called a first direction; the valve seat and the valve core are both cylindrical structures arranged along the first direction, and are both coaxial with the valve body; the valve seat is fixedly installed in the valve body, and the valve core is located on the side of the valve seat away from the inlet in the first direction and is slidingly sealed with the valve seat; the valve core comprises a water flow section, and a plurality of water flow holes are provided on the water flow section; the adjusting ring and the sealing plate are arranged in the valve core along the first direction The spool and the valve core are arranged in sequence and are coaxial with each other. The adjusting ring is located on the side of the sealing plate away from the inlet in the first direction. The adjusting ring and the valve core are slidingly sealed. In the initial state, the adjusting ring is located at the water flow section; the adjusting ring can move along the first direction toward the side close to the sealing plate and abut against the sealing plate, and the abutment between the adjusting ring and the sealing plate can seal the end of the valve core close to the outlet; the movement of the adjusting ring has a first stroke and a second stroke. In the first stroke, the adjusting ring and the valve core move synchronously in the first direction, the adjusting ring approaches the sealing plate, and the water flow section and the valve body are slidingly sealed; in the second stroke, the adjusting ring moves relative to the valve core in the first direction, the adjusting ring abuts against the sealing plate, and the water flow section is separated from the valve body.

[0006] Furthermore, a limit ring is provided in the valve seat, which is coaxially arranged with the valve seat. When the sealing plate abuts the adjustment ring, the limit ring can abut against the valve core synchronously. After the limit ring abuts against the valve core, the adjustment ring can move in the first direction relative to the valve core.

[0007] Furthermore, the distance between the limiting ring and the valve core in the first direction is equal to the distance between the sealing plate and the adjusting ring in the first direction.

[0008] Furthermore, the adjusting ring and the valve core are connected via a first elastic member, and the first elastic member is arranged along the first direction.

[0009] Furthermore, the valve core also includes a barrel section and a sealing section, which are arranged in sequence in the first direction and fixedly connected, and the water-passing section is located on the side of the barrel section away from the inlet in the first direction, and the diameter of the barrel section is larger than the diameter of the water-passing section; a sealing ring is provided inside the valve body, and the sealing ring is coaxial with the valve body; a first sealing surface and a second sealing surface are provided on the inner circumferential wall surface of the sealing ring, and the first sealing surface and the second sealing surface are arranged in sequence in the first direction, and in the initial state, the first sealing surface abuts the sealing section, and the second sealing surface abuts the water-passing section.

[0010] Furthermore, it also includes a rotating plate and a connecting rod. The rotating plate can be installed in the valve seat so as to rotate around an axis in a second direction, and the second direction is perpendicular to the first direction. The rotating plate and the adjusting ring are rotatably connected through the connecting rod.

[0011] Furthermore, the cross-section of the chamber inside the valve body perpendicular to the first direction is elliptical; the limiting ring can move in the first direction, the limiting ring and the sealing plate are connected by a synchronization member, and when the limiting ring moves along the first direction toward the inlet side, the sealing plate can move synchronously with the limiting ring.

[0012] Furthermore, the synchronization component includes a synchronization rod, which is arranged along the first direction, one end of the synchronization rod is fixed to the sealing plate, and the other end of the synchronization rod is slidably matched with the limit ring and abuts against the limit ring through the limit column.

[0013] Furthermore, the sealing plate and the limiting ring are connected via a second elastic member, and the second elastic member is arranged along the first direction.

[0014] Furthermore, a baffle is provided on the valve seat, which is located on the inlet side and coaxial with the valve seat, and a screw is coaxially and rotatably provided on the baffle; the baffle is used to limit the movement of the screw in the first direction and enable the screw to only rotate on itself; a movable plate is screwed on the screw, and the limit ring is connected to the movable plate through a stop rod.

[0015] The beneficial effects of the present invention are as follows: a flow control valve for a chemical pipeline according to the present invention is configured to cooperate with a valve body, a valve seat, a valve core, an adjusting ring, and a sealing plate, and the movement of the adjusting ring is divided into a first stroke and a second stroke. In the first stroke, the adjusting ring moves synchronously with the valve core, and the valve core operates normally, achieving water flow and flow regulation. In the second stroke, the adjusting ring moves until it abuts the sealing plate. At this time, the adjusting ring moves relative to the valve core, reversely squeezing the water inside the valve core, backflushing and cleaning the valve core, eliminating the need for disassembly of the valve core, reducing maintenance costs, and ensuring normal use of the flow control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the overall structure of an embodiment of a flow control valve for a chemical pipeline according to the present invention;

[0018] Figure 2 A schematic diagram of the internal structure of a flow control valve for a chemical pipeline according to an embodiment of the present invention;

[0019] Figure 3 This is a front view of the overall structure of an embodiment of a flow control valve for a chemical pipeline of the present invention;

[0020] Figure 4 for Figure 3 Cross-sectional view along the middle line AA;

[0021] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0022] Figure 6 This is an exploded view of the overall structure of an embodiment of a flow control valve for a chemical pipeline of the present invention;

[0023] Figure 7 A side view of the overall structure of an embodiment of a flow control valve for a chemical pipeline according to the present invention;

[0024] Figure 8 for Figure 7 Cross-sectional view at the center line CC;

[0025] Figure 9 This is a state diagram of an adjustment ring of a flow control valve for a chemical pipeline according to an embodiment of the present invention moving in a first stroke;

[0026] Figure 10 This is a state diagram of an embodiment of a flow control valve for a chemical pipeline according to the present invention, in which an adjustment ring moves in a second stroke;

[0027] Figure 11 for Figure 10 Enlarged view of point D in the middle;

[0028] Figure 12 This is a state diagram of an embodiment of a flow control valve for a chemical pipeline of the present invention when backflushing of the water flow section ends;

[0029] Figure 13 This is a state diagram of a flow control valve for a chemical pipeline according to an embodiment of the present invention after the limit ring has moved;

[0030] Figure 14 for Figure 13 Enlarged view of point E in the middle.

[0031] In the figure: 100, valve body; 101, inlet; 102, outlet; 103, shell section; 104, tail section; 110, valve seat; 111, baffle; 112, screw; 113, movable plate; 120, valve core; 121, water flow section; 122, cylinder section; 123, sealing section; 130, adjusting ring; 140, sealing plate; 150, limiting ring; 151, anti-rotation rod; 160, first elastic member; 170, sealing ring; 171, first sealing surface; 172, second sealing surface; 180, driving member; 181, rotating plate; 182, connecting rod; 183, rotating rod; 184, connecting plate; 185, connecting rod; 190, synchronization rod; 191, limiting column; 200, second elastic member. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] An embodiment of a flow control valve for a chemical pipeline of the present invention is as follows Figures 1 to 14 shown.

[0034] A flow control valve for a chemical pipeline includes a valve body 100, a valve seat 110, a valve core 120, an adjusting ring 130, and a sealing plate 140. The valve body 100 has an inlet 101 and an outlet 102. Water can enter the valve body 100 from the inlet 101 and flow out through the outlet 102. The direction of water flow from the inlet 101 to the outlet 102 is referred to as the first direction.

[0035] The valve seat 110 and valve core 120 are both cylindrical structures arranged along a first direction and coaxial with the valve body 100. The valve seat 110 is fixedly mounted within the valve body 100. The valve core 120 is located on the side of the valve seat 110 away from the inlet 101 in the first direction and forms a sliding seal with the valve seat 110. The valve core 120 includes a water flow section 121, which is located on the side of the valve seat 110 closer to the outlet 102 in the first direction. The water flow section 121 is provided with a plurality of water flow holes. The plurality of water flow holes are evenly distributed on the outer peripheral surface of the water flow section 121.

[0036] The adjusting ring 130 and the sealing plate 140 are arranged sequentially along a first direction within the valve core 120 and are both coaxial with the valve core 120. The adjusting ring 130 is located on the side of the sealing plate 140 that is farther away from the inlet 101 in the first direction. The adjusting ring 130 and the valve core 120 form a sliding seal. In the initial state, the adjusting ring 130 is located in the water flow section 121. The adjusting ring 130 can move along the first direction toward the side closer to the sealing plate 140 and abut against the sealing plate 140. The abutment between the adjusting ring 130 and the sealing plate 140 can block the end of the valve core 120 that is closer to the outlet 102.

[0037] The movement of the adjusting ring 130 has a first stroke and a second stroke. In the first stroke, the adjusting ring 130 and the valve core 120 move synchronously in the first direction, the adjusting ring 130 approaches the sealing plate 140, and the water flow section 121 and the valve body 100 are slidingly sealed; in the second stroke, the adjusting ring 130 moves relative to the valve core 120 in the first direction, the adjusting ring 130 abuts against the sealing plate 140, and the water flow section 121 is separated from the valve body 100.

[0038] The adjustment ring 130 is a circular ring, the sealing plate 140 is a circular plate, and the diameter of the sealing plate 140 is larger than the diameter of the inner circle of the adjustment ring 130 .

[0039] Specifically, the valve seat 110 is blocked at one end near the inlet 101 in the first direction, and is connected at one end near the valve core 120 in the first direction, so that after the water flows into the valve body 100 from the side of the inlet 101, it will be diverted by the valve seat 110 and flow in a ring shape. The valve core 120 is connected at both ends in the first direction. A sealing strip is provided at one end of the sealing plate 140 near the adjusting ring 130 in the first direction, and a sealing groove is provided at one end of the adjusting ring 130 near the sealing plate 140 in the first direction. The adjusting ring 130 moves along the side near the sealing plate 140 in the first direction to engage the sealing strip and the sealing groove, thereby sealing the end of the valve core 120 near the outlet 102 through the sealing plate 140 and the adjusting ring 130.

[0040] This embodiment comprises a valve body 100, a valve seat 110, a valve core 120, an adjusting ring 130, and a sealing plate 140. When in use, the flow control valve is installed in a chemical pipeline, and water is then introduced into the valve body 100 from the inlet 101. After entering the valve body 100, the water flows toward the outlet 102. Specifically, the water flows along the outer peripheral wall of the valve seat 110 toward the outer peripheral wall of the valve core 120, and when passing through the water passage section 121 of the valve core 120, it passes through the water passage holes on the water passage section 121 and finally flows out of the outlet 102.

[0041] When the water flow rate needs to be adjusted, the regulating ring 130 is driven to move in the first direction toward the side close to the inlet 101. In the first stroke of the regulating ring 130, the water flow section 121 and the valve body 100 are slidably sealed, and the regulating ring 130 and the valve core 120 move synchronously in the first direction and approach the sealing plate 140. Figure 9 As shown, when the adjusting ring 130 drives the valve core 120 to move in the first direction toward the side close to the inlet 101 (moving to the right), the position of the sliding seal between the water flow section 121 and the valve body 100 also changes with the movement of the adjusting ring 130. With the position of the sliding seal between the water flow section 121 and the valve body 100 as the dividing point, as the adjusting ring 130 moves, the length of the water flow section 121 located to the right of the dividing point gradually increases, thereby increasing the flow rate of water.

[0042] When the water hole is clogged with impurities and needs to be cleaned, the adjusting ring 130 is continued to move in the first direction toward the side close to the inlet 101, so that the adjusting ring 130 moves to the second stroke, and the water flow section 121 is separated from the valve body 100. At this time, the water flow will flow directly from the inlet 101 side to the outlet 102 side without having to pass through the water flow section 121, so that the water flow maintains basic circulation and avoids process interruption.

[0043] The adjusting ring 130 is in contact with the sealing plate 140, that is, the channel through which water flows directly out of the valve core 120 between the valve core 120 and the valve body 100 is blocked by the sealing plate 140. This is equivalent to the sealing plate 140, the adjusting ring 130 and the valve core 120 forming a piston structure. At this time, moving the adjusting ring 130 will cause it to move relative to the valve core 120 in the first direction toward the side closer to the inlet 101, forcing the water flow inside the valve core 120 back through the water hole, backflushing and cleaning the water flow section 121. This eliminates the need to disassemble the valve core 120, reduces maintenance costs, and ensures normal use of the flow control valve.

[0044] Specifically, this embodiment divides the movement of the adjusting ring 130 into a first stroke and a second stroke. During the first stroke, the adjusting ring 130 moves synchronously with the valve core 120, allowing the valve core 120 to function normally, achieving water flow and flow regulation. During the second stroke, the adjusting ring 130 moves until it abuts the sealing plate 140. At this point, the sealing plate 140, adjusting ring 130, and valve core 120 form a piston structure. The adjusting ring 130 moves relative to the valve core 120, forcing the water flow inside the valve core 120 back through the water hole, backflushing and cleaning the water flow section 121.

[0045] In a further embodiment, a limit ring 150 is disposed within the valve seat 110 and is coaxially disposed with the valve seat 110. The distance between the limit ring 150 and the valve core 120 in the first direction is equal to the distance between the sealing plate 140 and the adjusting ring 130 in the first direction. Consequently, when the sealing plate 140 abuts the adjusting ring 130, the limit ring 150 can simultaneously abut the valve core 120. Furthermore, after the limit ring 150 abuts the valve core 120, the adjusting ring 130 can move relative to the valve core 120 in the first direction toward the side closer to the inlet 101.

[0046] In this embodiment, the limiting ring 150 is provided. When the sealing plate 140 abuts the adjusting ring 130, the limiting ring 150 also abuts the valve core 120. The movement of the valve core 120 is restricted by the limiting ring 150, and the adjusting ring 130 moves relative to the valve core 120 in the first direction.

[0047] The adjusting ring 130 and the valve core 120 are connected via a first elastic member 160 , which is disposed along a first direction and is a tension spring.

[0048] In this embodiment, a first elastic member 160 is provided. In the first stroke of the adjustment ring 130, the adjustment ring 130 will push the valve core 120 to move synchronously through the first elastic member 160. At this time, the first elastic member 160 is not compressed. In the second stroke of the adjustment ring 130, the movement of the valve core 120 is blocked. The adjustment ring 130 moves in the first direction relative to the valve core 120, causing the first elastic member 160 to be compressed.

[0049] In a further embodiment, the valve core 120 further comprises a barrel section 122 and a sealing section 123. The barrel section 122, the sealing section 123, and the water flow section 121 are sequentially arranged in the first direction and fixedly connected. The barrel section 122, the sealing section 123, and the water flow section 121 are integrally formed. The water flow section 121 is located on the side of the barrel section 122 that is farther from the inlet 101 in the first direction. The diameter of the barrel section 122 is greater than the diameter of the water flow section 121, resulting in the sealing section 123 having a conical structure. A sealing ring 170 is disposed within the valve body 100 and is coaxial with the valve body 100. The inner circumferential surface of the sealing ring 170 has a first sealing surface 171 and a second sealing surface 172. The first sealing surface 171 and the second sealing surface 172 are sequentially arranged in the first direction. The first sealing surface 171 is located on the side of the second sealing surface 172 that is closer to the inlet 101 in the first direction. The first sealing surface 171 is an inclined surface. In the initial state, the first sealing surface 171 abuts the sealing section 123, and the second sealing surface 172 abuts the water-passing section 121. During the first travel of the adjusting ring 130, the water-passing section 121 and the second sealing surface 172 of the sealing ring 170 form a sliding seal. During the second travel of the adjusting ring 130, the water-passing section 121 and the second sealing surface 172 of the sealing ring 170 disengage.

[0050] Specifically, the valve body 100 includes a shell section 103 and a tail section 104 , the inlet 101 is opened on the shell section 103 , the outlet 102 is opened on the tail section 104 , the shell section 103 and the tail section 104 are connected by bolts, and the sealing ring 170 is arranged between the shell section 103 and the tail section 104 .

[0051] In this embodiment, a sealing ring 170 is provided, and in the initial state, the first sealing surface 171 abuts against the sealing section 123, and the second sealing surface 172 abuts against the water flow section 121. Figure 4 、 Figure 5 and Figure 8 As shown, water flow is restricted, unable to enter water flow section 121 and, consequently, unable to flow out of outlet 102. The entire flow control valve is in a closed state. When the adjusting ring 130 moves, the valve core 120 moves relative to the valve body 100, disengaging the sealing section 123 from the first sealing surface 171. The water flow section 121 moves relative to the second sealing surface 172, allowing water to flow through.

[0052] In a further embodiment, a flow control valve for a chemical pipeline further includes a driving member 180 , and the driving member 180 is used to drive the adjustment ring 130 to move in the first direction.

[0053] The driving member 180 includes a rotating plate 181 and a connecting rod 182. The rotating plate 181 is rotatably mounted in the valve seat 110 about an axis in a second direction perpendicular to the first direction. The rotating plate 181 and the adjusting ring 130 are rotatably connected via the connecting rod 182.

[0054] Specifically, a rotating rod 183 is fixedly mounted at each end of the rotating plate 181 along the second direction. The rotating rods 183 are arranged along the second direction. One rotating rod 183 is rotatably engaged with the valve body 100, while the other rotating rod 183 passes through the valve seat 110 and the valve body 100 along the second direction and extends out of the chemical pipeline, where it is rotatably engaged with the valve seat 110 and the valve body 100. A handle is connected to the rotating rod 183. Alternatively, a rotating motor is connected to the rotating rod 183.

[0055] The connecting rod 182 and the adjustment ring 130 are connected by a connector. This connector includes a connecting plate 184 and a plurality of connecting rods 185. The connecting plate 184 is rotatably connected to the connecting rod 182. The plurality of connecting rods 185 are arranged along a first direction and are evenly distributed around the first direction between the adjustment ring 130 and the connecting plate 184. The adjustment ring 130, connecting plate 184, and the plurality of connecting rods 185 are integrally formed. The sealing plate 140 is located within the space defined by the plurality of connecting rods 185.

[0056] Furthermore, the handle is equipped with indicators for rotation. These indicators indicate several key points during the rotation of the handle. These indicators include: when the handle is rotated to disengage the sealing section 123 from the first sealing surface 171, causing the water flow section 121 to move relative to the second sealing surface 172, allowing water to flow through; when the sealing plate 140 abuts the adjusting ring 130, and when the stop ring 150 abuts the valve core 120; and when the sealing plate 140 and adjusting ring 130 move to the junction of the water flow section 121 and the sealing section 123 (ending the backwash of the water flow section 121).

[0057] During use, the operator can manually rotate the handle, which drives the rotating rod 183 connected to the handle to rotate. The rotation of the rotating rod 183 drives the rotating plate 181 and the other rotating rod 183 to rotate about the axis in the second direction. The rotation of the rotating plate 181 drives the adjusting ring 130 to move in the first direction through the connecting rod 182 and the connecting member. The axis in the second direction is the axis of the rotating rod 183.

[0058] In another possible embodiment, the chamber within the housing segment 103 has an elliptical cross-section perpendicular to the first direction. The limiting ring 150 is movable in the first direction to adjust the distance between the limiting ring 150 and the valve core 120. The limiting ring 150 is connected to the sealing plate 140 via a synchronizing member. When the limiting ring 150 moves in the first direction toward the inlet 101, the sealing plate 140 moves synchronously with the limiting ring 150. The sealing plate 140 is also movable relative to the limiting ring 150 in the first direction toward the inlet 101.

[0059] Among them, the synchronization part includes a synchronization rod 190, which is arranged along the first direction. One end of the synchronization rod 190 is fixed to the sealing plate 140, and the other end of the synchronization rod 190 is slidably matched with the limit ring 150 and abuts against the limit ring 150 through the limit column 191.

[0060] Specifically, the limiting column 191 is screwed to the synchronization rod 190. Alternatively, the limiting column 191 is fixed to the synchronization rod 190 and is an integrally formed structure.

[0061] Furthermore, two synchronization rods 190 are provided. The sealing plate 140 and the limiting ring 150 are connected via a second elastic member 200 . The second elastic member 200 is arranged along the first direction and is a tension spring. The second elastic member 200 is sleeved on the synchronization rod 190 .

[0062] The valve seat 110 is provided with a baffle 111, located on one side of the inlet 101 and coaxial with the valve seat 110. A screw 112 is coaxially and rotatably mounted on the baffle 111. The baffle 111 is used to restrict the movement of the screw 112 in a first direction, allowing it to rotate only on its own axis. A movable plate 113 is threaded onto the screw 112. A stop ring 150 is connected to the movable plate 113 via a stop rod 151, which extends out of the valve seat 110 in the first direction and slidably engages with the valve seat 110.

[0063] Specifically, the baffle 111 is mounted on the valve seat 110 via bolts, and a protrusion is coaxially and fixedly provided at one end of the screw rod 112 near the baffle 111 in the first direction. An annular groove is provided on the baffle 111, and the protrusion rotates in conjunction with the annular groove, thereby allowing the screw rod 112 to rotate only relative to the baffle 111 and limiting the movement of the screw rod 112 in the first direction. A plurality of stop rods 151 are provided, and the plurality of stop rods 151 are evenly distributed around the first direction between the limit ring 150 and the movable plate 113. The two ends of the stop rods 151 along the first direction are respectively connected to the limit ring 150 and the movable plate 113. The limit ring 150, the movable plate 113, and the plurality of stop rods 151 are fixedly connected in sequence in the first direction and form an integrally formed structure.

[0064] Before using this embodiment, the screw rod 112 can be rotated. The rotation of the screw rod 112 will drive the movable plate 113, which is screwed thereto, to move in the first direction. The movement of the movable plate 113 will drive the limiting ring 150 to move via the anti-rotation rod 151. When the movable plate 113 moves along the first direction toward the side close to the inlet 101, the limiting ring 150 will move synchronously with the sealing plate 140 via the synchronization rod 190, thereby ensuring that the distance between the limiting ring 150 and the valve core 120 in the first direction and the distance between the sealing plate 140 and the adjustment ring 130 in the first direction are always equal. That is, when the sealing plate 140 abuts the adjustment ring 130, the limiting ring 150 abuts the valve core 120 synchronously.

[0065] It should be noted that the pitch of the screw 112 and the movable plate 113 is not large, so the transmission between the screw 112 and the movable plate 113 is effective only when the screw 112 rotates. When the sealing plate 140 abuts against the adjusting ring 130 and the limit ring 150 abuts against the valve core 120 synchronously, the screw 112 locks the limit ring 150, making the limit ring 150 unable to move, and then in the second stroke of the adjusting ring 130, the adjusting ring 130 will move relative to the valve core 120, compressing the first elastic member 160.

[0066] When cleaning the valve core 120, if the water quality is poor, the limiting ring 150 can be moved toward the side closer to the inlet 101. At this time, the valve core 120 needs to be moved closer to the inlet 101 so that the sealing plate 140 abuts against the adjusting ring 130 and the limiting ring 150 abuts against the valve core 120. This setting can increase the distance that the valve core 120 moves in the first direction, increase the gap between the inner wall of the valve body 100 and the outer wall of the valve core 120, and reduce the water pressure when the water flows through the water flow section 121 of the valve core 120, making it easier to backwash impurities during backflushing. When the water flows between the valve body 100 and the valve core 120, the backflushed water is more easily carried away, reducing the probability of impurities adhering to the water again.

[0067] In combination with the above embodiment, the specific working process is as follows:

[0068] During operation, the handle is manually rotated, driving the rotation rod 183 and the rotating plate 181. The rotation of the rotating plate 181, through the connecting rod 182 and the connecting member, drives the adjusting ring 130 in the first direction. When the adjusting ring 130 initially moves, the valve core 120 moves relative to the sealing ring 170 on the valve body 100, disengaging the sealing section 123 from the first sealing surface 171. The water flow section 121 then moves relative to the second sealing surface 172, allowing water to flow through the water flow section 121.

[0069] To adjust the water flow rate, the adjusting ring 130 and valve core 120 are moved synchronously in the first direction, approaching the sealing plate 140. The water flow section 121 and the second sealing surface 172 of the sealing ring 170 form a sliding seal, increasing the water flow rate. At this point, the adjusting ring 130, through the first elastic member 160, pushes the valve core 120 to move synchronously. The first elastic member 160 is not compressed, and the adjusting ring 130 is in its first travel.

[0070] When the water hole is clogged with impurities and needs to be cleaned, the adjusting ring 130 is continued to move in the first direction toward the side close to the inlet 101, so that the movement of the adjusting ring 130 reaches the second stroke. At this time, the adjusting ring 130 abuts against the sealing plate 140, that is, the channel for the water between the valve core 120 and the valve body 100 to flow out directly through the valve core 120 is blocked by the sealing plate 140, which is equivalent to the sealing plate 140, the adjusting ring 130 and the valve core 120 forming a piston structure. When the sealing plate 140 abuts against the adjusting ring 130, the limit ring 150 will also abut against the valve core 120 synchronously. The movement of the valve core 120 will be restricted by the limit ring 150. At this time, the water flow section 121 is separated from the valve body 100. The water flow will flow directly from the inlet 101 side to the outlet 102 side, and no longer has to pass through the water flow section 121, so that the water flow maintains basic circulation and avoids process interruption.

[0071] At this time, moving the adjusting ring 130 will cause the adjusting ring 130 to move relative to the valve core 120 in the first direction toward the side close to the inlet 101, and the water flow inside the valve core 120 will be squeezed out through the water hole in the opposite direction, and the water flow section 121 will be backflushed and cleaned. There is no need to disassemble the valve core 120, which reduces maintenance costs and enables the flow control valve to be used normally.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow control valve for a chemical pipeline, characterized by: , The closure of the valve core is formed on the closure member and the closure member is provided with a spring which is adapted to move the closure member in a direction parallel to the first direction and to the closure member so that the closure member is in a closed position and the closure member is in a closed position. The movement of the adjusting ring has a first stroke and a second stroke. In the first stroke, the adjusting ring and the valve core move synchronously in the first direction, the adjusting ring approaches the sealing plate, and the water passing section and the valve body are slidably sealed; in the second stroke, the adjusting ring moves relative to the valve core in the first direction, the adjusting ring abuts against the sealing plate, and the water passing section is separated from the valve body.

2. A flow control valve for a chemical pipeline according to claim 1, characterized in that: A limit ring is provided in the valve seat, which is coaxial with the valve seat. When the sealing plate abuts the adjustment ring, the limit ring can abut the valve core synchronously. After the limit ring abuts the valve core, the adjustment ring can move in the first direction relative to the valve core.

3. A flow control valve for a chemical pipeline according to claim 2, characterized in that: The distance between the limiting ring and the valve core in the first direction is equal to the distance between the sealing plate and the adjusting ring in the first direction.

4. A flow control valve for a chemical pipeline according to claim 1, characterized in that: The regulating ring and the valve core are connected via a first elastic member, and the first elastic member is arranged along a first direction.

5. The flow control valve for a chemical pipeline according to claim 1, characterized in that: The valve core also includes a barrel section and a sealing section. The barrel section, the sealing section and the water flow section are arranged in sequence in the first direction and are fixedly connected. The water flow section is located on the side of the barrel section away from the inlet in the first direction. The diameter of the barrel section is larger than the diameter of the water flow section. A sealing ring is provided inside the valve body, and the sealing ring is coaxial with the valve body. A first sealing surface and a second sealing surface are provided on the inner circumferential wall surface of the sealing ring. The first sealing surface and the second sealing surface are arranged in sequence in the first direction. In the initial state, the first sealing surface abuts the sealing section, and the second sealing surface abuts the water flow section.

6. A flow control valve for a chemical pipeline according to claim 1, characterized in that: It also includes a rotating plate and a connecting rod. The rotating plate can be installed in the valve seat so as to rotate around an axis in a second direction, and the second direction is perpendicular to the first direction. The rotating plate and the adjusting ring are rotatably connected through the connecting rod.

7. A flow control valve for a chemical pipeline according to claim 2, characterized in that: The cross-section of the chamber inside the valve body perpendicular to the first direction is elliptical; the limit ring can move in the first direction, the limit ring and the sealing plate are connected by a synchronous part, and when the limit ring moves along the first direction toward the inlet side, the sealing plate can move synchronously with the limit ring.

8. A flow control valve for a chemical pipeline according to claim 7, characterized in that: The synchronous component includes a synchronous rod, which is arranged along a first direction. One end of the synchronous rod is fixed to the sealing plate, and the other end of the synchronous rod is slidably matched with the limiting ring and abuts against the limiting ring through a limiting column.

9. A flow control valve for a chemical pipeline according to claim 7, characterized in that: The sealing plate and the limiting ring are connected via a second elastic member, and the second elastic member is arranged along the first direction.

10. A flow control valve for a chemical pipeline according to claim 7, characterized in that: A baffle is provided on the valve seat, which is located on the inlet side and coaxial with the valve seat. A screw is coaxially and rotatably provided on the baffle; the baffle is used to limit the movement of the screw in the first direction and enable the screw to only rotate on its own; a movable plate is screwed on the screw, and a limit ring is connected to the movable plate through a stop rod.

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