Water flow control valve

Abstract

The invention provides a water flow control valve which comprises a flow path shell internally provided with a flowing water path and a water control valve installed on the flow path shell in a connected mode, and a valve element used for blocking a valve port is installed at the position of the valve port of the flow path shell. An actuator and a reduction gear are installed in a shell of the water control valve, the axial front end of the actuator is provided with a valve rod connected to the flow path shell connector in a sliding mode, and the axial movement direction of the valve rod is the same as the axis direction of the reduction gear. According to the application, the circulation waterway is opened and closed by converting rotation of the reduction gear into linear motion of the actuator, when the circulation waterway is opened, the N pole of the magnet on the reduction gear rotates to the position opposite to the Hall switch, and the Hall switch controls the external water source piece to supply water to the circulation waterway; therefore, opening and water supply of the waterway can be synchronously realized only by rotating the reduction gear once, and the water flow control valve is simple in structure and easy and convenient to operate.

Description

Technical Field

[0001] The invention relates to a water flow control valve. Background Art

[0002] A water flow control valve is a device used to control water flow. It is used in plumbing systems to regulate, distribute, limit or shut off water flow.

[0003] The actuator of the water flow control valve is used to control the opening and closing of the water channel. In order to realize the water supply function into the water channel, it is necessary to install an external water source component (such as an angle valve) at the water inlet end of the water channel. Whether there is water supply or water supply stop in the water channel needs to be controlled by the switch angle valve. That is, the opening and closing of the water channel and the supply and stop of water supply require these two steps to be operated on two independent components separately to be realized, which leads to the complex structure of the water flow control valve and the cumbersome steps in actual operation. Summary of the invention

[0004] The present invention provides a water flow control valve which can effectively solve the above problems.

[0005] The present invention is achieved in that:

[0006] A water flow control valve comprises a flow path housing with a water flow path inside and a water control valve mounted on the flow path housing, a valve core for blocking the valve port is installed at the valve port of the flow path housing; an actuator and a reduction gear are installed in the housing of the water control valve, the axial front end of the actuator has a valve stem slidably connected to the interface of the flow path housing, and the axial displacement direction of the valve stem is the same as the axial direction of the reduction gear;

[0007] The rear end of the actuator has a ramp portion that is axially displaced from the valve stem. An actuating slope is embedded in the annular groove provided on the reduction gear. There is a height difference between the top A and the bottom B of the actuating slope. The ramp portion extends into the annular groove and forms contact pressure with the surface of the actuating slope. When the reduction gear is rotated and the actuating slope contacts the bottom B, the valve stem slides backward. At this time, the valve core is pressed and blocks the valve port, and the water flow path is closed. When the actuating slope contacts the top A and the ramp portion, the valve stem slides forward, and the valve core is pushed by the valve stem to open the valve port, and the water flow path is opened.

[0008] A magnet is fixed on the reduction gear, and a Hall switch is installed on the outer wall of the shell to cooperate with the magnetic induction of the magnet to control the opening and closing of water supply in the circulation water path. When the slope portion touches the top A of the actuating slope, the circulation water path is opened, and the N pole of the Hall switch and the magnet on the reduction gear are in relative position to control the external water source component to supply water to the circulation water path.

[0009] As a further improvement, the actuator includes an adapter seat, the front end of the adapter seat is provided with a plug-in groove, the rear end is provided with a limit groove, the valve stem is inserted and fixed in the plug-in groove, and the slope portion is fixed to the edge surface of the limit groove.

[0010] As a further improvement, the valve core includes an integrally formed sealing portion for pressing and sealing the valve port and a driven portion extending downward from the middle of the lower end surface of the sealing portion. A pressure spring is provided at the water inlet end of the flow path housing for pressing the sealing portion downward to seal the valve core and tighten the valve port; a sealing ring is interference fit at the valve port.

[0011] As a further improvement, the outer shell includes a front shell cover and a rear shell cover which are buckled together, the front end outer side surface of the front shell cover is protruded to form a plug-in portion with a accommodating groove, the rear end of the accommodating groove is communicated with the interior of the front shell cover, the flow path shell has an assembly groove facing the water control valve side and is plug-in compatible with the plug-in portion, the end of the plug-in portion is protruded to form a pressing portion, and a sliding hole for the valve stem to slide through is opened from the plug-in portion to the pressing portion.

[0012] As a further improvement, a sealing membrane is interference fit between the valve stem and the inner wall surface of the interface, and the sealing membrane has an integrally formed wall-adhering portion and a sealing portion. A slot for the pressing portion to be plugged in is provided at the rear end of the wall-adhering portion, and a through hole for the valve stem to pass through is provided at the front end. A sealing ring groove is provided between the pressing portion and the plug-in portion, and the sealing portion is interference fit between the sealing ring groove and the wall surface of the interface.

[0013] As a further improvement, an actuating spring is sleeved on the circumferential side of the valve stem to press the slope portion against the surface of the actuating slope. The annular convex edge on the circumferential side of the front end of the adapter seat and the end face form a mounting groove. One force-bearing end of the actuating spring is pressed against the bottom of the mounting groove, and the other force-bearing end is pressed against the bottom of the accommodating groove.

[0014] As a further improvement, two guiding convex strips are symmetrically fixed on the wall surface of the accommodating groove, and a slot hole communicating with the mounting groove and for axial insertion of the guiding convex strip is opened on the adapter.

[0015] As a further improvement, the reduction gear is rotatably connected to the inner wall of the rear shell cover through an axis, and the rear shell cover is equipped with a gear set meshing with the reduction gear and a motor for driving the gear set to rotate to drive the reduction gear to rotate synchronously.

[0016] As a further improvement, the gear set includes a first gear fixed to the motor output shaft, a second gear meshing with the first gear, a third gear coaxially transmitted with the second gear, a fourth gear meshing with the third gear, and a fifth gear coaxially transmitted with the fourth gear and meshing with the reduction gear. The module of each gear is 0.5, the number of teeth of the first gear is 12, the number of teeth of the second gear is 15, the number of teeth of the third gear is 10, the number of teeth of the fourth gear is 15, the number of teeth of the fifth gear is 10, and the number of teeth of the reduction gear is 66.

[0017] The beneficial effects of the present invention are:

[0018] The present application realizes the opening and closing of the circulation water channel by converting the rotation of the reduction gear into the linear motion of the actuator. When the circulation water channel is opened, the N pole of the magnet on the reduction gear rotates to a relative position with the Hall switch, and the Hall switch controls the external water source to supply water to the circulation water channel. In this way, the water channel can be opened and supplied with water synchronously by rotating the reduction gear only once. The water flow control valve has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 The exploded view of the assembly relationship between the flow path housing and the outer shell of the present invention is Figure 1 ;

[0021] Figure 3 The exploded view of the assembly relationship between the flow path housing and the outer shell of the present invention is Figure 2 ;

[0022] Figure 4 It is an exploded schematic diagram of the assembly relationship between the actuator and the sealing membrane of the present invention;

[0023] Figure 5 It is a structural cross-sectional view of the present invention when the water flow path is opened and the control valve starts to supply water;

[0024] Figure 6 The present invention Figure 5 The enlarged schematic diagram of the center C;

[0025] Figure 7 It is a structural cross-sectional view of the present invention when the water flow path is closed and the control valve stops supplying water;

[0026] Figure 8 The present invention Figure 7 The enlarged schematic diagram of point D in the middle;

[0027] Fig. 9 It is a schematic diagram of the meshing relationship between the gear set and the reduction gear of the present invention.

[0028] The accompanying drawings are marked as follows:

[0029] 10. Flow path housing; 101. Flow path; 102. Assembly groove; 1021. Clamp hole; 1022. Deformation clearance groove; 103. Interface; 104. Valve port; 1041. Sealing ring;

[0030] 20. Water control valve; 21. Housing;

[0031] 212, front shell cover; 2122, plug-in portion; 21221, receiving groove; 21222, guide convex strip; 21223, buckle portion; 2123, pressing portion; 2120, sliding hole; 2124, sealing ring groove; 2125, enclosure structure; 2126, buckle plate; 2127, hook hole;

[0032] 213, rear housing cover; 2131, groove; 2132, hook portion; 2133, gear set; 1, first gear; 2, second gear; 3, third gear; 4, fourth gear; 5, fifth gear;

[0033] 22, actuator; 221, valve stem; 222, ramp portion; 223, adapter seat; 2231, plug-in slot; 2232, limit slot; 2233, mounting slot; 2234, slot hole; 224, actuating spring;

[0034] 23. reduction gear; 230. annular groove; 231. actuating slope; A. top; B. bottom; 232. magnet; 233. limiting column; 234. guide convex edge;

[0035] 24, valve core; 241, blocking part; 242, driven part;

[0036] 25. Top pressure spring;

[0037] 30, sealing film; 31, wall-attaching portion; 311, slot; 312, perforation; 32, sealing portion;

[0038] 40. Hall switch;

[0039] 50. Motor. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0041] like Figures 1 to 8As shown, a water flow control valve comprises a flow path housing 10 with a circulating water path 101 inside and a water control valve 20 mounted on the flow path housing 10, a valve core 24 for blocking the valve port 104 is installed at the valve port 104 of the flow path housing 10; an actuator 22 and a reduction gear 23 are installed in the housing 21 of the water control valve 20, the axial front end of the actuator 22 has a valve stem 221 slidably connected to the interface 103 of the flow path housing 10, and the axial displacement direction of the valve stem 221 is the same as the axial direction of the reduction gear 23; the rear end of the actuator 22 has a ramp portion 222 axially misaligned with the valve stem 221, an annular groove 230 provided on the reduction gear 23 is embedded with an actuating slope 231, there is a height difference between the top A and the bottom B of the actuating slope 231, the ramp portion 222 extends into the annular groove 230 and forms a surface of the actuating slope 231 The deceleration gear 23 is rotated, and when the actuating slope 231 is pressed against the bottom B, the valve stem 221 retreats and slides, at which time the valve core 24 presses and blocks the valve port 104, and the circulation waterway 101 is closed. When the actuating slope 231 is pressed against the top A and the ramp portion 222, the valve stem 221 slides forward, and the valve core 24 is pushed by the valve stem 221 to open the valve port 104, and the circulation waterway 101 is opened. A magnet 232 is fixedly mounted on the deceleration gear 23, and a Hall switch 40 is mounted on the outer wall of the housing 21 to cooperate with the magnetic induction of the magnet 232 to control the opening and closing of the water supply in the circulation waterway 101. When the ramp portion 222 is pressed against the top A of the actuating slope 231, the circulation waterway 101 is opened, and the N poles of the Hall switch 40 and the magnet 232 on the deceleration gear 23 are in relative positions to control the external water source component (not shown) to supply water to the circulation waterway 101. It should be noted here that the external water source component of the present application is an angle valve mounted on the water inlet end of the flow path housing 10 .

[0042] The structures of the various components of the present invention are described below.

[0043] like Figure 2 to Figure 4 As shown, the actuator 22 includes an adapter seat 223, the front end of the adapter seat 223 is provided with a plug-in groove 2231, and the rear end is provided with a limit groove 2232, the valve stem 221 is inserted and fixed in the plug-in groove 2231, the ramp portion 222 is fixed to the edge surface of the limit groove 2232, and a bulge in the middle of the annular groove 230 is formed with a limit column 233 adapted to be inserted in the limit groove 2232 to limit the radial movement of the adapter seat 223.

[0044] like Figure 2 to Figure 4 As shown, the valve core 24 includes an integrally formed sealing portion 241 for pressing and sealing the valve port 104 and a driven portion 242 extending downward from the middle of the lower end surface of the sealing portion 241. The water inlet end of the flow path housing 10 is provided with a pressing spring 25 for pressing the sealing portion 241 downward to seal the valve core 24 and tighten the valve port 104; a sealing ring 1041 is interference fit at the valve port 104.

[0045] When the water flow path 101 is closed, the pressure spring 25 presses the blocking portion 241 downward and presses it against the valve port 104. At this time, the axis of the driven portion 242 is perpendicular to the axis of the valve stem 221. When the water flow path 101 is opened, the valve stem 221 slides forward and pushes the driven portion 242, causing its axis to deviate from the original axial position, driving one side of the blocking portion 241 to tilt up to open the valve port 104.

[0046] like Figure 2 to Figure 4 As shown, the outer shell 21 includes a front shell cover 212 and a rear shell cover 213 which are buckled together. The front outer side surface of the front end of the front shell cover 212 is protruded to form a plug-in portion 2122 with a receiving groove 21221. The rear end of the receiving groove 21221 is communicated with the interior of the front shell cover 212. The flow path shell 10 has an assembly groove 102 that is plugged into and cooperates with the plug-in portion 2122 on the side facing the water control valve 20. The end of the plug-in portion 2122 is protruded to form a pressing portion 2123. A sliding hole 2120 for the valve stem 221 to slide through is provided from the plug-in portion 2122 to the pressing portion 2123.

[0047] like Figures 4 to 8 As shown, a sealing membrane 30 is interference fit between the valve stem 221 and the inner wall surface of the interface 103, and the sealing membrane 30 has an integrally formed wall-attaching portion 31 and a sealing portion 32. The rear end of the wall-attaching portion 31 is provided with a slot 311 for the pressing portion 2123 to be plugged in, and the front end is provided with a through hole 312 for the valve stem 221 to pass through. A sealing ring groove 2124 is provided between the pressing portion 2123 and the plug-in portion 2122, and the sealing portion 32 is interference fit between the sealing ring groove 2124 and the wall surface of the interface 103. It should be noted here that the pressing portion 2123 is a hook-shaped structure. When the pressing portion 2123 is inserted into the slot 311, the pressing portion 2123 and the slot 311 form a hook-anchor fit, so that the pressing portion 2123 and the sealing membrane 30 form a tight and stable connection relationship.

[0048] like Figures 4 to 8 As shown, an actuating spring 224 is sleeved on the circumferential side of the valve stem 221 to press the ramp portion 222 against the surface of the actuating slope 231, and the annular convex edge on the circumferential side of the front end of the adapter seat 223 and the end face form a mounting groove 2233, one force-bearing end of the actuating spring 224 is pressed against the bottom of the mounting groove 2233, and the other force-bearing end is pressed against the bottom of the accommodating groove 21221; two guide convex strips 21222 are symmetrically fixed on the wall surface of the accommodating groove 21221, and a slot hole 2234 that communicates with the mounting groove 2233 and is axially inserted into the guide convex strip 21222 is opened on the adapter seat 223. With this design, during the axial sliding of the valve stem 221, the circumferential rotation of the adapter seat 223 can be limited, thereby improving the stability and safety of the actuator 22 during use.

[0049] like Figures 5 to 8As shown, the reduction gear 23 has a guide protrusion 234 on the side facing the adapter 223, and an annular groove 230 is provided on the end face of the guide protrusion 234. The inner side surface of the front shell cover 212 is raised relative to the plug-in portion 2122 to form a containment structure 2125, and the inner side of the containment structure 2125 is closely matched with the outer side of the guide protrusion 234; the reduction gear 23 is connected to the inner wall of the rear shell cover 213 through an axial rotation, and the rear shell cover 213 is installed with a gear set 2133 meshing with the reduction gear 23 and a motor 50 for driving the gear set 2133 to rotate so as to drive the reduction gear 23 to rotate synchronously; a groove 2131 for installing the Hall switch 40 is provided on the outer wall surface of the rear shell cover 213, and the groove 2131 is located above the reduction gear 23.

[0050] like Figure 2 and Fig. 9 As shown, the gear set 2133 includes a first gear 1 fixed to the output shaft of the motor 50, a second gear 2 meshing with the first gear 1, a third gear 3 coaxially driven with the second gear 2, a fourth gear 4 meshing with the third gear 3 and a fifth gear 5 coaxially driven with the fourth gear 4 and meshing with the reduction gear 23. The module of each gear is 0.5, the number of teeth of the first gear 1 is 12, the number of teeth of the second gear 2 is 15, the number of teeth of the third gear 3 is 10, the number of teeth of the fourth gear 4 is 15, the number of teeth of the fifth gear 5 is 10, and the number of teeth of the reduction gear 23 is 66. With such a design, the reduction gear 23 can be slowly driven by a multi-stage reduction method to ensure a smooth axial displacement process of the valve stem 221 and improve the stability and safety of the control valve during use.

[0051] like Figure 1 , Figure 2 and Figure 7 , Figure 8 As shown, when the reduction gear 23 rotates to the bottom B of the actuating slope 231 and contacts the ramp portion 222, the valve stem 221 moves axially backward under the elastic force of the actuating spring 224, and the sealing portion 241 presses the valve port 104 under the elastic force of the top pressure spring 25 to close the flow water path 101. At this time, the Hall switch 40 recognizes that the ramp portion 222 is at the bottom B position of the actuating slope 231, and the N pole of the magnet 232 on the reduction gear 23 is away from the Hall switch 40. The Hall switch 40 is not sensed, and the angle valve does not supply water to the flow water path 101.

[0052] On the contrary, if Figure 1 , Figure 2 and Figure 5 , Figure 6As shown, when the actuating slope 231 contacts the top A of the slope portion 222, the adapter 223 moves forward axially, the actuating spring 224 is compressed, and the valve stem 221 moves forward axially synchronously and pushes the driven portion 242, so that one side of the blocking portion 241 of the valve core 24 is tilted, the valve port 104 is opened, and the flow water path 101 is opened. At this time, the Hall switch 40 recognizes that the slope portion 222 is at the top A position of the actuating slope 231, and the N pole of the magnet 232 on the reduction gear 23 contacts the Hall switch 4 in the groove 2131. 0 is in a relative position, the Hall switch 40 senses and detects the change in magnetic field caused by the movement of the magnet 232 during the movement of the actuator 22, and forms an electrical signal caused by the magnet 232 changing with the displacement of the actuator 22, so as to control the angle valve to supply water to the circulation waterway 101; of course, as the reduction gear 23 continues to rotate, the S pole of the magnet 232 is in a relative position with the Hall switch (the N pole is far away from the Hall switch 40), at this time the Hall switch 40 is not sensed, and the angle valve does not supply water to the circulation waterway 101.

[0053] It should be noted here that the NS poles of the magnet can also be reversed, that is, when the deceleration magnetic wheel 23 rotates to the point where the S pole of the magnet corresponds to the Hall switch 40, the Hall switch 40 controls the angle valve to open the water supply. When the S pole of the magnet is away from the Hall switch 40, the Hall switch 40 does not sense and the angle valve does not supply water.

[0054] It should be noted here that when the top A of the actuating slope 231 contacts the ramp portion 222, the reduction gear 23 continues to rotate, and the ramp portion 222 falls from the top A of the actuating slope 231 to the bottom B. During this process, the actuating spring 224 pushes the adapter 223 to move axially backward.

[0055] like Figure 2 and Figure 3 As shown, a plurality of hook portions 2132 arranged at intervals are protruded on the peripheral wall surface of the rear shell cover 213, and a buckle plate 2126 corresponding to the hook portion 2132 is protruded on the side wall of the front shell cover 212, and the buckle plate 2126 is provided with a hook hole 2127 for the hook portion 2132 to hook and engage with; two buckle portions 21223 are symmetrically arranged on the peripheral side of the plug-in portion 2122, and a buckle hole 1021 for the buckle portion 21223 to hook and engage with is provided on the groove wall of the assembly groove 102, and deformation clearance grooves 1022 communicating with the assembly groove 102 are provided on both sides of the buckle hole 1021, and when the buckle portion 21223 is inserted into the buckle hole 1021, the groove wall of the assembly groove 102 can elastically give way to the deformation clearance groove 1022 to avoid cracks in the flow path housing 10 during the assembly process with the outer shell 21.

[0056] Combine the following Figures 1 to 8 , illustrating the assembly of the present invention.

[0057] The sealing film 30 is inserted into the interface 103, and the plug-in portion 2122 on the front shell cover 212 is aligned with the assembly groove 102 of the flow path housing 10 and inserted therein, so that the pressing portion 2123 is inserted into the slot 311 of the wall-adhering portion 31, and the sealing portion 32 is interference-engaged between the sealing ring groove 2124 and the wall surface of the interface 103. In this process, the buckle portion 21223 and the clamping hole 1021 form a hook-locking fit; the valve stem 221 is plugged and fixed in the plug-in groove 2231 of the adapter seat 223, and the actuating spring 224 is placed in the installation groove 2233, and then the valve stem 221 is aligned and inserted into the sliding hole 2120, and finally the hook portion 2132 on the rear shell cover 213 is aligned and buckled into the hook hole 2127 on the front shell cover 212, and at this time, the ramp portion 222 on the adapter seat 223 is located in the annular groove 230 of the reduction gear 23, and the quick assembly of the control valve is completed.

[0058] Combine the following Figures 1 to 8 , the working principle of the present invention is described in detail.

[0059] When the control valve is used to supply water, the motor 50 is started, and the motor 50 drives the gear set 2133 to rotate to drive the reduction gear 23 to rotate. During the process of the actuating slope 231 in the annular groove 230 rotating to the top A and forming contact pressure with the ramp portion 222, the valve stem 221 moves axially forward to push the driven portion 242 of the valve core 24, and overcomes the downward elastic force of the top pressure spring 25, so that one side of the blocking portion 241 is tilted to open the valve port 104. At this time, the water flow path 101 is opened, and the N pole of the magnet 232 on the reduction gear 23 rotates to a position relative to the Hall switch 40, and the Hall switch 40 controls the angle valve to supply water to the water flow path 101.

[0060] When the control valve stops supplying water, the motor 50 continues to drive the gear set 2133 to rotate. During the process of the actuating slope 231 in the annular groove 230 rotating to the bottom B and forming contact pressure with the slope portion 222, the valve stem 221 moves axially backward. Under the action of the downward elastic force of the top pressure spring 25, the blocking portion 241 presses the valve port 104, the water flow path 101 is closed, and the N pole of the magnet 232 on the reduction gear 23 rotates away from the Hall switch 40, and the angle valve stops supplying water to the water flow path 101.

[0061] The above embodiments are only used to illustrate the present invention, not to limit the present invention. A person skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and be defined by the claims.

Claims

1. A water flow control valve, comprising a flow path housing (10) having a water flow path (101) therein and a water control valve (20) mounted on the flow path housing (10), characterized in that: A valve core (24) for blocking the valve opening (104) is installed at the valve opening (104) of the flow path housing (10); an actuator (22) and a reduction gear (23) are installed in the housing (21) of the water control valve (20); the actuator (22) has a valve stem (221) at the axial front end thereof which is slidably connected to the interface (103) of the flow path housing (10); the axial displacement direction of the valve stem (221) is the same as the axial direction of the reduction gear (23); The rear end of the actuator (22) has a ramp portion (222) axially offset from the valve stem (221); an actuating slope (231) is embedded in an annular groove (230) provided on the reduction gear (23); a height difference exists between the top A and the bottom B of the actuating slope (231); the ramp portion (222) extends into the annular groove (230) and forms contact pressure with the surface of the actuating slope (231); when the reduction gear (23) is rotated and the actuating slope (231) contacts and presses with the bottom B, the valve stem (221) retreats and slides, at which time the valve core (24) presses and blocks the valve port (104), the flow water path (101) is closed, and when the actuating slope (231) contacts and presses with the top A and the ramp portion (222), the valve stem (221) slides forward, the valve core (24) is pushed by the valve stem (221) to open the valve port (104), and the flow water path (101) is opened; A magnet (232) is fixedly mounted on the reduction gear (23), and a Hall switch (40) is mounted on the outer wall of the housing (21) to cooperate with the magnet (232) in magnetic induction to control the opening and closing of water supply in the circulation water path (101). When the slope portion (222) contacts and presses the top A of the actuating slope (231), the circulation water path (101) is opened, and the N poles of the Hall switch (40) and the magnet (232) on the reduction gear (23) are in relative positions, so as to control the external water source component to supply water to the circulation water path (101).

2. A water flow control valve according to claim 1, characterized in that: The actuator (22) comprises an adapter seat (223), the front end of the adapter seat (223) is provided with a plug-in slot (2231), and the rear end is provided with a limit slot (2232), the valve stem (221) is inserted and fixed in the plug-in slot (2231), and the ramp portion (222) is fixed to the edge surface of the limit slot (2232).

3. A water flow control valve according to claim 1, characterized in that: The valve core (24) comprises an integrally formed sealing portion (241) for pressing and sealing the valve port (104) and a driven portion (242) extending downward from the middle of the lower end surface of the sealing portion (241); a pressure spring (25) for pressing the sealing portion (241) downward to enable the valve core (24) to seal and press the valve port (104); and a sealing ring (1041) is interference fit at the valve port (104).

4. A water flow control valve according to claim 2, characterized in that: The outer shell (21) comprises a front shell cover (212) and a rear shell cover (213) which are buckled together. The front outer side surface of the front shell cover (212) is protruded to form a plug-in portion (2122) having a receiving groove (21221). The rear end of the receiving groove (21221) is communicated with the interior of the front shell cover (212). The flow path housing (10) has an assembly groove (102) which is plugged and matched with the plug-in portion (2122) on the side facing the water control valve (20). The end of the plug-in portion (2122) is protruded to form a pressing portion (2123). A sliding hole (2120) for the valve stem (221) to slide through is provided from the plug-in portion (2122) to the pressing portion (2123).

5. A water flow control valve as claimed in claim 4, characterized in that: A sealing film (30) is interference-fitted between the valve stem (221) and the inner wall surface of the interface (103). The sealing film (30) comprises an integrally formed wall-attaching portion (31) and a sealing portion (32). The rear end of the wall-attaching portion (31) is provided with a slot (311) for the pressing portion (2123) to be plugged in, and the front end is provided with a through hole (312) for the valve stem (221) to pass through. A sealing ring groove (2124) is provided between the pressing portion (2123) and the plug-in portion (2122). The sealing portion (32) is interference-fitted between the sealing ring groove (2124) and the wall surface of the interface (103).

6. A water flow control valve according to claim 4, characterized in that: An actuating spring (224) is sleeved around the valve stem (221) to press the ramp portion (222) against the surface of the actuating slope (231). The annular convex edge around the front end of the adapter seat (223) and the end surface form a mounting groove (2233). One force-bearing end of the actuating spring (224) is pressed against the bottom of the mounting groove (2233), and the other force-bearing end is pressed against the bottom of the accommodating groove (21221).

7. A water flow control valve according to claim 4, characterized in that: Two guide convex strips (21222) are symmetrically fixed on the groove wall surface of the accommodating groove (21221), and a slot hole (2234) communicating with the mounting groove (2233) and for axial insertion of the guide convex strips (21222) is opened on the adapter seat (223).

8. A water flow control valve as claimed in claim 4, characterized in that: The reduction gear (23) is rotatably connected to the inner wall of the rear shell cover (213) via a shaft, and the rear shell cover (213) is mounted with a gear set (2133) meshing with the reduction gear (23) and a motor (50) for driving the gear set (2133) to rotate so as to drive the reduction gear (23) to rotate synchronously.

9. A water flow control valve according to claim 7, characterized in that: The gear set (2133) comprises a first gear (1) fixedly connected to the output shaft of the motor (50), a second gear (2) meshing with the first gear (1), a third gear (3) coaxially driven with the second gear (2), a fourth gear (4) meshing with the third gear (3), and a fifth gear (5) coaxially driven with the fourth gear (4) and meshing with the reduction gear (23), wherein the module of each gear is 0.5, the number of teeth of the first gear (1) is 12, the number of teeth of the second gear (2) is 15, the number of teeth of the third gear (3) is 10, the number of teeth of the fourth gear (4) is 15, the number of teeth of the fifth gear (5) is 10, and the number of teeth of the reduction gear (23) is 66.

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