Flow control valve capable of finely dividing flow and having emergency adjustment function

Abstract

The flow control valve comprises a valve body, the valve body is provided with a valve seat, the valve seat is provided with a valve sleeve, the valve seat is provided with an upper main flow channel and two sub-flow channels, the two sub-flow channels are communicated with the upper main flow channel, a lower main flow channel is formed between the lower ends of the two sub-flow channels and the valve sleeve, and a main valve element assembly is arranged in the upper main flow channel. The main valve element assembly comprises a driving element body, a first reset spring, a balance element body and a support, the driving element body is in sliding fit with the upper main runner and connected with the first reset spring, an electromagnetic coil is arranged outside the driving element body, the balance element body is hinged to the lower end of the driving element body, the hinge point is close to the end of the balance element body, and the support is arranged at the bottom of the balance element body and hinged to the balance element body. And sub-valve cores are correspondingly arranged in the two sub-runners and are hinged to the two ends of the balance core body respectively. According to the flow control valve in the technical scheme, when any sub-flow channel is blocked, the flow control function can still be normally achieved, and the influence on operation reliability is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow control valves, in particular to a flow control valve capable of fine flow distribution and emergency regulation. BACKGROUND

[0002] A flow control valve is a valve device for regulating the flow of fluid (liquid or gas) through a piping system. It precisely controls the amount of medium passing through by changing the opening degree or passage cross-sectional area of the valve, ensuring stable flow and reasonable distribution, and can be manually, electrically or automatically adjusted according to needs, so it is widely used in industrial automation, hydraulic systems, heating, ventilation and air conditioning, etc.

[0003] Currently, mainstream flow control valves generally adopt single-flow channel structure design. For example, a water conservancy pipeline flow control valve disclosed in a Chinese authorized patent with publication number CN119900831A includes a valve core and a valve seat, and a fluid passage is provided on the valve seat and controlled by the valve core. Another example is a valve with a flow regulating mechanism disclosed in a Chinese authorized patent with publication number CN115467990B, which includes a valve body, a valve cover arranged on the valve body, a valve stem installed on the valve cover and extending into the valve body, an opening and closing member arranged on the valve stem, and a butt joint pipe connected to the valve body and having a flow channel.

[0004] The flow control valve with the above single-flow channel structure has obvious technical limitations. On the one hand, its single throttling characteristic results in a narrow flow regulation range, making it difficult to achieve fine and graded control. On the other hand, when the flow channel is blocked, the basic function of flow control will be lost due to the lack of a backup channel, seriously affecting the operation reliability. SUMMARY

[0005] In view of the above, in order to overcome the problems of the existing flow control valve with single-flow channel structure, such as narrow flow regulation range and loss of basic flow control function due to lack of backup channel when the flow channel is blocked, affecting operation reliability, the purpose of the present application is to provide a flow control valve with two groups of parallel sub-flow channels and cooperating sub-valve cores to increase the flow regulation range and ensure the normal implementation of flow control function when any sub-flow channel is blocked, reducing the impact on operation reliability.

[0006] To achieve the above purpose, the technical solution of the present application is:

[0007] The application discloses a flow control valve capable of fine flow distribution and emergency adjustment, which comprises a valve body, a valve seat, a valve sleeve, an upper main flow channel, a sub-flow channel, an inlet, a lower main flow channel, a main valve core assembly, a drive core, a first reset spring, a balance core, a support, a sub valve core, a through-flow plate, a sealing column, a main body, a valve flap, a standby flow channel, an emergency valve core assembly, an emergency core and a second reset spring.

[0008] Preferably, the sub-flow channel is provided with a through-flow plate arranged in a horizontal direction, the through-flow plate is provided with a first through-flow hole, the sub valve core is provided with a second through-flow hole, the axis of the first through-flow hole is parallel to the axis of the second through-flow hole, and the first through-flow hole and the second through-flow hole are misaligned with each other.

[0009] Preferably, the through-flow plate is provided with a sealing column opposite to the second through-flow hole, and the sealing column is matched with the second through-flow hole in shape.

[0010] Preferably, the sub valve core comprises a main body and a valve flap, the main body is hinged to the balance core, the valve flap is arranged on the peripheral wall of the main body, the diameter of the main body is smaller than the diameter of the sub-flow channel, the diameter of the valve flap is equal to the diameter of the sub-flow channel, and the second through-flow hole is arranged on the valve flap.

[0011] Preferably, the valve seat is provided with a standby flow channel, the standby flow channel is equal in number to the sub-flow channels and corresponds to the sub-flow channels, the two ends of the standby flow channel are communicated with the sub-flow channels and the lower main flow channel respectively, the inside of the standby flow channel is provided with an emergency valve core assembly, the emergency valve core assembly comprises an emergency core and a reset spring, the emergency core is slidably connected to the standby flow channel and opposite to the sub-flow channel, and the second reset spring is connected to the emergency core.

[0012] Preferably, the standby flow channel is provided with a first through-flow section and a second through-flow section, the first through-flow section and the second through-flow section are respectively communicated with the sub-flow channel and the lower main flow channel, the second through-flow section is communicated with the middle part of the first through-flow section, the emergency core is slidably connected to the first through-flow section, one end of the second reset spring is connected to the emergency core, and the other end of the second reset spring is connected to the end of the first through-flow section away from the sub-flow channel.

[0013] Preferably, the bottom of the end of the first through-flow section away from the sub-flow channel is provided with an inner recess, the emergency core is provided with a sliding table slidably connected to the inner recess, the width of the sliding table is smaller than the inner recess, and the second reset spring is arranged in the inner recess, one end of the second reset spring is connected to the sliding table, and the other end of the second reset spring is connected to the side wall of the inner recess.

[0014] Preferably, the outer peripheral wall of the valve body has upper and lower limit position platforms in opposite directions, and the inner wall of the valve sleeve has upper and lower limit position grooves formed correspondingly, and the upper and lower limit position platforms are respectively in abutment with the upper and lower limit position grooves.

[0015] Preferably, a first sealing ring is arranged between the upper limit position platform and the upper limit position groove, and a second sealing ring is arranged between the lower limit position platform and the lower limit position groove.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] The present application expands the flow regulation range by controlling the opening and closing of the corresponding valve core through the design of two sub-flow channels, and the sub-valve cores in the two sub-flow channels are driven by the same main valve core assembly, thereby simplifying the overall structure and reducing the production cost, and the connecting path of the upper main flow channel and the lower main flow channel has two paths, which can still ensure the basic flow control function of the flow control valve when any sub-flow channel is blocked, thereby improving the reliability of operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall structure schematic diagram of the flow control valve of the present application;

[0019] Figure 2 is the cross-sectional structure schematic diagram of the flow control valve of the present application;

[0020] Figure 3 is the enlarged structure schematic diagram of A part of the present application Figure 2 ;

[0021] Figure 4 is the enlarged structure schematic diagram of B part of the present application Figure 2 ;

[0022] Figure 5 is the enlarged structure schematic diagram of C part of the present application Figure 2 ;

[0023] Figure 6 is the cross-sectional structure schematic diagram of the flow control valve of the present application in the working state when the sub-flow channel is not blocked (the solid arrow is the fluid medium flow direction);

[0024] Figure 7 is the cross-sectional structure schematic diagram of the flow control valve of the present application in the working state when the sub-flow channel is blocked (the solid arrow is the fluid medium flow direction);

[0025] Figure 8 is the enlarged structure schematic diagram of D part of the present application Figure 7 (the solid arrow is the fluid medium flow direction, and the hollow arrow is the moving direction of the emergency core body).

[0026] As shown in the figure:

[0027] 1. valve body; 101. upper limit platform; 102. lower limit platform; 2. valve seat; 201. upper main flow passage; 202. sub flow passage; 203. standby flow passage; 203a. first through-flow section; 203b. second through-flow section; 203c. inner sink groove; 3. valve sleeve; 301. inlet; 302. lower main flow passage; 303. upper limit groove; 304. lower limit groove; 4. main valve core assembly; 401. driving core body; 402. first return spring; 403. balance core body; 404. support; 5. electromagnetic coil; 6. sub valve core; 601. main body; 602. valve flap; 602a. second through-flow hole; 7. through-flow plate; 701. first through-flow hole; 702. sealing column; 8. emergency valve core assembly; 801. emergency core body; 801a. slide table; 802. return spring; 9. first sealing ring; 10. second sealing ring. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the drawings and specific embodiments.

[0029] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of simplifying the description, and do not indicate or imply that the orientation is a specific orientation and a specific orientation configuration and operation, and therefore cannot be understood as a limitation on the application.

[0030] As Figures 1 to 4 And Figure 6 And Figure 7As shown, a flow control valve capable of fine flow distribution and emergency adjustment includes a valve body 1 having a valve seat 2, the valve seat 2 is provided with a valve sleeve 3, the valve seat 2 is internally provided with an upper main flow channel 201 and sub flow channels 202, the sub flow channels 202 are two, the diameters of the two sub flow channels 202 are not equal, meeting the adjustment requirements of different flow sizes, the upper ends of the two sub flow channels 202 are communicated with the upper main flow channel 201, and the lower ends form a lower main flow channel 302 between the valve sleeve 3, it is necessary to mention that the outer wall of the valve sleeve 3 is provided with an inlet port 301, the inlet port 301 is communicated with the upper main flow channel 201, so that the fluid medium can enter the upper main flow channel 201 through the inlet port 301, the upper main flow channel 201 is provided with a main valve core assembly 4, the main valve core assembly 4 includes a driving core body 401, a first reset spring 402, a balance core body 403 and a support 404, wherein the driving core body 401 is in sliding fit with the upper main flow channel 201, the driving core body 401 can move up and down along the axial direction of the upper main flow channel 201, and is connected with the first reset spring 402, the first reset spring 402 is used for driving the driving core body 401 to move and reset, the driving core body 401 is externally sleeved with an electromagnetic coil 5, the driving core body 401 is magnetized when the electromagnetic coil 5 is energized, forming a directional magnetic pole, moving along the upper main flow channel 201 under the driving of the magnetic field gradient force, overcoming the elastic force of the first reset spring 402, the balance core body 403 is hinged with the lower end of the driving core body 401, the two ends of the balance core body 403 respectively extend above the two sub flow channels 202, and the hinged point of the balance core body 403 and the driving core body 401 is close to any one end of the balance core body 403, the support 404 is arranged at the bottom of the balance core body 403 and is hinged with the balance core body 403, when the driving core body 401 moves, downward force is applied to the balance core body 403 to make the balance core body 403 rotate around the hinged point of the support 404, so that the two ends thereof swing up and down, two sub valve cores 6 are correspondingly arranged in the two sub flow channels 202, the sub valve cores 6 can move up and down along the axial direction of the sub flow channel 202, the two groups of sub valve cores 6 are respectively hinged with the two ends of the balance core body 403, the balance core body 403 swinging up and down serves as a power source for the two sub valve cores 6, so as to realize the movement along the sub flow channel 202, and in the movement process, the corresponding sub flow channel 202 is opened or closed, more specifically, one of the sub valve cores 6 is located at the lower side of the sub flow channel 202 in the initial state, and the other sub valve core 6 is located at the upper side of the sub flow channel 202, there is a height difference between the two sub valve cores 6, at this time, the sub valve core 6 located at the lower side closes the sub flow channel 202, the sub valve core 6 located at the upper side opens the sub flow channel 202, after the fluid medium enters the upper main flow channel 201, it will sequentially pass through the opened sub flow channel 202 and the lower main flow channel 302 and enter the pipeline system, the design of the two sub flow channels 202 is controlled by the corresponding valve core to expand the flow adjustment range, and the sub valve cores 6 in the two sub flow channels 202 are driven by the same main valve core assembly 4, so as to simplify the overall structure and reduce the production cost,The upper main flow channel 201 and the lower main flow channel 302 have two paths, and the basic flow control function of the flow control valve of the present application can be ensured when any sub-flow channel 202 is blocked, thereby improving the reliability of operation.

[0031] As shown in Figure 2 , Figure 4 , Figure 6 and Figure 7 , the sub-flow channel 202 has a flow-through plate 7, the flow-through plate 7 is arranged in the horizontal direction, the cross section of the flow-through plate 7 is consistent with the cross-sectional shape of the corresponding sub-flow channel 202, and the flow-through plate 7 can be abutted by the sub-valve core 6 when the sub-valve core 6 moves, at which time the lowest position is reached, the flow-through plate 7 has a first flow-through hole 701, the number of the first flow-through hole 701 has several, the first flow-through hole 701 connects the spaces on both sides of the flow-through plate 7, when the sub-flow channel 202 is opened, the fluid medium will pass through each flow-through hole to the other side, and then enter the pipeline system through the lower main flow channel 302, the sub-valve core 6 is provided with a second flow-through hole 602a, the number of the second flow-through hole 602a also has several, the axis of the first flow-through hole 701 is parallel to the axis of the second flow-through hole 602a, and the first flow-through hole 701 and the second flow-through hole 602a are mutually offset, when the sub-valve core 6 is at the lowest position that can be moved, each first flow-through hole 701 is closed, at which time the first flow-through hole 701 and the second flow-through hole 602a are in a disconnected state, and the sub-flow channel 202 is closed, accordingly, when the sub-valve core 6 moves upward and is separated from the cooperation with the flow-through plate 7, the first flow-through hole 701, the second flow-through hole 602a and the sub-flow channel 202 part therebetween are mutually connected, and the sub-flow channel 202 is opened.

[0032] As shown in Figure 4 and Figure 8 , the flow-through plate 7 has a sealing column 702 opposite to the second flow-through hole 602a, the shape of the sealing column 702 is matched with the second flow-through hole 602a, when the sub-valve core 6 abuts against the flow-through plate 7 in the corresponding sub-flow channel 202, the sealing column 702 on the flow-through plate 7 will be inserted into each second flow-through hole 602a of the sub-valve core 6, and the sealing property when abutting is improved by plug-in cooperation, thereby effectively preventing the fluid medium from passing through this sub-flow channel 202.

[0033] As shown in Figure 2 , Figure 4 and Figures 6 to 8As shown, the sub-valve core 6 is composed of two parts, the main body 601 and the valve disc 602, the main body 601 is hinged with the balance core 403, the valve disc 602 is located on the outer peripheral wall of the main body 601, the shape of the valve disc 602 is annular in the present application, the diameter of the main body 601 is smaller than that of the sub-flow passage 202, a gap will be generated between the inner wall of the sub-flow passage 202 and the main body 601, which allows the fluid medium to enter the sub-flow passage 202, the diameter of the valve disc 602 is equal to that of the sub-flow passage 202, that is, the fluid medium cannot directly enter the other side through the cooperation position of the valve disc 602 and the sub-flow passage 202, the second through-flow hole 602a is opened on the valve disc 602, when the valve disc 602 abuts against the through-flow plate 7, the first through-flow hole 701 and the second through-flow hole 602a are disconnected, and correspondingly, when the sub-valve core 6 moves upward, the first through-flow hole 701 and the second through-flow hole 602a are connected with each other.

[0034] As shown in Figure 2 , Figure 4 and Figures 6 to 8 , the spare flow passage 203 is opened in the valve seat 2, the spare flow passage 203 is equal in number and corresponds to the sub-flow passage 202, that is, the spare flow passage 203 has two, the two ends of the two spare flow passages 203 are respectively communicated with the sub-flow passage 202 and the lower main flow passage 302, allowing the fluid medium to enter the pipeline system through the spare flow passage 203 in an emergency state, the inside of the spare flow passage 203 is provided with an emergency valve core assembly 8, the emergency valve core assembly 8 includes an emergency core 801 and a reset spring 9802, the emergency core 801 is slidingly connected with the spare flow passage 203, the spare flow passage 203 is in an open and closed state through the sliding of the emergency core 801, and the emergency core 801 is opposite to the sub-flow passage 202, the second reset spring 802 is connected with the emergency core 801, the function of the second reset spring 802 is consistent with that of the first reset spring 402, which is used to drive the emergency core 801 to reset, when any sub-flow passage 202 is blocked, the fluid medium accumulates in the sub-flow passage 202, at this time, the fluid pressure continuously increases and pushes the emergency core 801 along the spare flow passage 203 to make it open by overcoming the elastic force of the second reset spring 802, the accumulated fluid medium can enter the lower flow passage through the spare flow passage 203 and finally enter the pipeline system, the above-mentioned setting will provide a necessary emergency solution, the spare flow passage 203 will play the same role as the sub-flow passage 202, ensuring that the basic flow regulating function of the flow control valve of the present application is not affected.

[0035] As shown in Figure 4 and Figure 8As shown, the backup flow channel 203 has a first flow-through section 203a and a second flow-through section 203b, the first flow-through section 203a and the second flow-through section 203b are respectively communicated with the sub-flow channel 202 and the lower main flow channel 302, and the second flow-through section 203b is communicated with the middle part of the first flow-through section 203a, and the shape of the backup flow channel 203 is T-shaped as a whole, the emergency core 801 is slidably connected with the first flow-through section 203a, one end of the second reset spring 802 is connected with the emergency core 801, and the other end is connected with the end of the first flow-through section 203a away from the sub-flow channel 202, when any sub-flow channel 202 is blocked, the emergency core 801 in the corresponding backup flow channel 203 moves to the side of the first flow-through section 203a away from the sub-flow channel 202 under the pressure of the fluid medium and against the elastic force of the second reset spring 802, it is to be mentioned here that the length of the side of the first flow-through section 203a away from the sub-flow channel 202 is greater than or equal to the length of the emergency core 801, so that the second flow-through section 203b can be completely opened, at this time the accumulated fluid medium can enter the lower flow channel and finally enter the pipeline system through the backup flow channel 203.

[0036] As shown in Figure 4 and Figure 8 , the bottom of the end of the first flow-through section 203a away from the sub-flow channel 202 is provided with an inner sink groove 203c, the emergency core 801 has a sliding table 801a slidably matched with the inner sink groove 203c, that is, the overall shape of the emergency core 801 is close to L-shaped, the side wall of the inner sink groove 203c will limit the movement distance of the emergency core 801 in the matching state, so as to avoid the problem of moving out of position and separating from the first flow-through section 203a, the width of the sliding table 801a is less than the inner sink groove 203c, which provides sufficient movable space for the sliding table 801a, the second reset spring 802 is arranged in the inner sink groove 203c, one end of the second reset spring 802 is connected with the emergency core 801, and the other end is connected with the side wall of the inner sink groove 203c.

[0037] As shown in Figure 5 , the outer peripheral wall of the valve body 1 has an upper limiting table 101 and a lower limiting table 102 opposite to each other, and the inner wall of the valve sleeve 3 is correspondingly provided with an upper limiting groove 303 and a lower limiting groove 304, the upper limiting table 101 and the lower limiting table 102 are respectively abutted with the upper limiting groove 303 and the lower limiting groove 304, based on the above setting, the up-down movement of the valve sleeve 3 can be effectively limited by the cooperation of the upper limiting table 101, the lower limiting table 102, the upper limiting groove 303 and the lower limiting groove 304, so that the valve sleeve 3 is stably fixed with the valve seat 2.

[0038] As shown in Figure 5As shown, the upper limit position platform 101 and the upper limit position groove 303 are provided with a first sealing ring 9 between the cooperation positions, and the lower limit position platform 102 and the lower limit position groove 304 are provided with a second sealing ring 10 between the cooperation positions, so that the first sealing ring 9 and the second sealing ring 10 can ensure the good sealing between the valve sleeve 3 and the valve seat 2, thereby preventing the leakage of the fluid medium.

[0039] In combination Figures 1 to 8 , the flow control valve of the present application can ensure the basic flow regulation function when the valve sleeve 3 is in the working state. The fluid medium is input from the inlet port 301 of the valve sleeve 3 to the upper main flow channel 201, the electromagnetic coil 5 of the main valve core assembly 4 is powered first, the drive core body 401 is magnetized to form a directional magnetic pole, and the drive core body 401 is driven to move along the upper main flow channel 201 against the elastic force of the first reset spring 402 under the magnetic field gradient force, and when moving, the balance core body 403 connected to one end of the balance core body 403 is subjected to the action force to make the balance core body 403 rotate around the hinge point of the support 404, so that the two ends of the balance core body 403 swing up and down, and then drive the sub valve core 6 in one of the sub flow channels 202 to move upwards, and the sub valve core 6 in the other sub flow channel 202 moves downwards. The sub valve core 6 moving upwards increases the distance between the sub valve core 6 and the flow-through plate 7 in the sub flow channel 202, so that the first flow-through hole 701 and the second flow-through hole 602a are connected, the sub flow channel 202 is opened, and the sub valve core 6 moving downwards is in close contact with the flow-through plate 7 in the sub flow channel 202, so that the first flow-through hole 701 and the second flow-through hole 602a are disconnected, and the sub flow channel 202 is closed. The medium fluid can pass through the opened sub flow channel 202 and enter the pipeline system through the lower main flow channel 302. When any sub flow channel 202 is blocked, the fluid medium accumulates in the sub flow channel 202, and the fluid pressure increases and pushes the emergency core body 801 along the first flow-through section 203a of the standby flow channel 203 to move against the elastic force of the second reset spring 802 of the emergency valve core assembly 8, so that the second flow-through section 203b is opened, and the accumulated fluid medium can enter the lower flow channel through the second flow-through section 203b of the standby flow channel 203 and finally enter the pipeline system, so as to ensure that the basic flow regulation function is not affected when blocked.

[0040] The above embodiments and descriptions in the specification are only to illustrate the principles and the best embodiments of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A flow control valve capable of precise flow diversion and emergency adjustment, characterized in that, It includes a valve body (1), the valve body (1) having a valve seat (2), the valve seat (2) having a valve sleeve (3), the valve seat (2) having an upper main flow channel (201) and a sub-flow channel (202), the valve sleeve (3) having an inlet (301) communicating with the upper main flow channel (201), the sub-flow channel (202) having two, the two sub-flow channels (202) having unequal diameters, and the upper ends of the two sub-flow channels (202) communicating with the upper main flow channel (201), and the lower ends forming a lower main flow channel (302) with the valve sleeve (3), the upper main flow channel (201) having a main valve core assembly (4), the main valve core assembly (4) including a drive core (401). The system includes a first return spring (802) (402), a balance core (403), and a support (404). The drive core (401) is slidably engaged with the upper main channel (201) and connected to the first return spring (802) (402). An electromagnetic coil (5) is sleeved on the outside of the drive core (401). The balance core (403) is hinged to the lower end of the drive core (401), and the hinge point is close to the end of the balance core (403). The support (404) is located at the bottom of the balance core (403) and is hinged to the balance core (403). Sub-valve cores (6) are correspondingly provided in the two sub-channels (202), and the two sets of sub-valve cores (6) are respectively hinged to the two ends of the balance core (403).

2. The flow control valve with precise flow diversion and emergency adjustment according to claim 1, characterized in that, The sub-channel (202) has a flow plate (7) arranged in a horizontal direction. The flow plate (7) has a first flow hole (701). The sub-valve core (6) has a second flow hole (602a). The axis of the first flow hole (701) is parallel to the axis of the second flow hole (602a) and they are offset from each other.

3. A flow control valve with precise flow diversion and emergency adjustment according to claim 2, characterized in that, The flow plate (7) has a sealing post (702) opposite to the second flow hole (602a), the shape of which matches the shape of the sealing post (702).

4. A flow control valve with fine flow diversion and emergency adjustment according to claim 3, characterized in that, The sub-valve core (6) includes a main body (601) and a valve disc (602). The main body (601) is hinged to the balance core (403). The valve disc (602) is located on the outer peripheral wall of the main body (601). The diameter of the main body (601) is smaller than the diameter of the sub-flow channel (202). The diameter of the valve disc (602) is equal to the diameter of the sub-flow channel (202). The second flow passage (602a) is opened on the valve disc (602).

5. A flow control valve with fine flow diversion and emergency adjustment according to any one of claims 1 to 3, characterized in that, The valve seat (2) is provided with a spare flow channel (203). The spare flow channel (203) is equal in number to and corresponds to the sub-flow channel (202). The two ends of the spare flow channel (203) are respectively connected to the sub-flow channel (202) and the lower main flow channel (302). An emergency valve core assembly (8) is provided inside the spare flow channel (203). The emergency valve core assembly (8) includes an emergency core (801) and a return spring (802). The emergency core (801) is slidably connected to the spare flow channel (203) and is opposite to the sub-flow channel (202). The second return spring (802) is connected to the emergency core (801).

6. A flow control valve with fine flow diversion and emergency adjustment according to claim 5, characterized in that, The backup flow channel (203) has a first flow section (203a) and a second flow section (203b). The first flow section (203a) and the second flow section (203b) are respectively connected to the sub-flow channel (202) and the lower main flow channel (302). The second flow section (203b) is connected to the middle of the first flow section (203a). The emergency core (801) is slidably connected to the first flow section (203a). One end of the second reset spring (802) is connected to the emergency core (801), and the other end is connected to one end of the back ion flow channel (202) of the first flow section (203a).

7. A flow control valve with fine flow diversion and emergency adjustment according to claim 6, characterized in that, An inner settling groove (203c) is provided at the bottom of one end of the back ion channel (202) of the first flow section (203a). The emergency core (801) has a slide (801a) that slides with the inner settling groove (203c). The width of the slide (801a) is smaller than that of the inner settling groove (203c). The second reset spring (802) is located in the inner settling groove (203c). One end of the spring is connected to the slide (801a), and the other end is connected to the side wall of the inner settling groove (203c).

8. A flow control valve with fine flow diversion and emergency adjustment according to any one of claims 1, 2, 3, 4, 6 or 7, characterized in that, The outer peripheral wall of the valve body (1) has an upper limit platform (101) and a lower limit platform (102) that are opposite each other. The inner wall of the valve sleeve (3) has an upper limit groove (303) and a lower limit groove (304) respectively. The upper limit platform (101) and the lower limit platform (102) abut against the upper limit groove (303) and the lower limit groove (304) respectively.

9. A flow control valve with precise flow diversion and emergency adjustment according to claim 8, characterized in that, A first sealing ring (9) is provided between the mating position of the upper limit platform (101) and the upper limit groove (303), and a second sealing ring (10) is provided between the mating position of the lower limit platform (102) and the lower limit groove (304).

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