Flushing valve and using method

Abstract

The flushing valve comprises a valve body and an actuator connected to an opening of the side wall of the valve body, the valve body is provided with a flow channel, a valve element used for blocking the flow channel is installed at a valve opening of the valve body, a driving motor used for controlling a reduction gear to rotate is installed in a shell, the driving motor is started, the reduction gear rotates, and the valve element is driven by the driving motor to rotate. In the process that the mounting frame is firstly attached to the stop ring area from the point A to the point B, the end of the valve rod is separated from the valve element, the valve element blocks the valve port, and the flow channel is closed. The moving stroke of the valve rod is limited by the stop ring area A point, the stop ring area B point and the action ring area C point of the driving wheel and does not exceed the preset range, and the situation that in the prior art, after a motor is closed, the valve rod is still driven to move beyond the designated position under the inertia effect is avoided; and an installation space for installing the travel switch does not need to be reserved in the actuator, so that the installation step of installing the part is omitted, the miniaturization production of the flushing valve is facilitated, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to a flush valve. Background Art

[0002] Most of the flush valves available on the market use a motor to drive the valve stem to move to open the valve core to open and close the flow channel in the valve body. Whether the valve stem moves to the right position requires a travel switch to be installed in the flush valve.

[0003] When producing the above-mentioned flush valve, considering the installation requirements of the travel switch, it is necessary to reserve installation space for the corresponding module components in the actuator, which is not conducive to the miniaturization production of the flush valve, and leads to an increase in the installation process, and the production cost is also increased accordingly; furthermore, in the process of the motor driving the valve stem to move, when the valve stem moves to the specified position, the travel switch sends a closing command to the motor, and the output shaft of the motor continues to drive the valve stem to slide forward a distance under the action of inertia, causing the valve stem to move beyond the specified position and bump into and damage the valve core, thereby increasing the subsequent maintenance costs of the user when using the flush valve. Summary of the invention

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

[0005] The present invention is achieved in that:

[0006] A flush valve comprises a valve body and an actuator mounted at an opening of a side wall of the valve body. The valve body has a flow channel, and a valve core for blocking the flow channel is installed at a valve port of the valve body.

[0007] The actuator includes a housing, a reduction gear and a valve stem. The reduction gear is rotatably installed inside the housing. The valve stem is slidably fitted at the opening of the valve body and the end of the valve stem is relatively positioned with the valve core. The valve stem can slide axially when actuated by the reduction gear, and the axial movement direction of the valve stem is perpendicular to the axial direction of the reduction gear. A driving wheel that contacts and matches with the tail end of the mounting frame is fixedly installed on the end face of the reduction gear. The driving wheel includes a stop ring area and an action ring area that are connected and arranged along the rotation direction. The stop ring area is coaxially fixed with the reduction gear. The radius of the action ring area is larger than that of the stop ring area and the centers of the two are staggered. The end where the stop ring area and the action ring area are connected is defined as point B, the opposite end is defined as point A, and the end of the action ring area away from point A is defined as point C.

[0008] A driving motor for controlling the rotation of the reduction gear is installed in the shell. When the driving motor is started and the reduction gear rotates, the mounting frame first contacts the stop ring area from point A to point B, the end of the valve stem is separated from the valve core, the valve core blocks the valve port, and the flow channel is closed; then, when the mounting frame contacts the action ring area from point B to point C, the valve stem is actuated by the action ring area with an increased radius, moves axially forward, pushes open the valve core, and the flow channel is opened.

[0009] As a further improvement, a magnet is embedded in the mounting frame arranged at the tail of the valve stem, and a Hall switch is installed on the inner wall surface of the shell close to the mounting frame to cooperate with the magnetic induction of the magnet to control the opening and closing of water supply in the flow channel.

[0010] As a further improvement, the actuator also includes a first gear rotatably arranged inside the housing, a second gear meshing with the first gear, a third gear coaxially fixed on the end face of the second gear, a fourth gear meshing with the third gear, and a fifth gear coaxially fixed on the end face of 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 56, the number of teeth of the third gear is 12, the number of teeth of the fourth gear is 56, the number of teeth of the fifth gear is 12, the number of teeth of the reduction gear is 60, and the transmission ratio of the above four-stage transmission is 109.05:23.35:5:1.

[0011] As a further improvement, the output shaft of the driving motor is fixedly connected to the first gear to drive the first gear to rotate; a push rod is slidably connected to the rear side wall inside the shell and is used to push the magnet on the mounting frame to slide back and forth; an assembly plate is fixedly arranged on the rear side wall inside the shell, and a sliding hole is provided on the assembly plate for the sliding connection of the push rod; a button is screwed on the tail end of the push rod, and an extension hole is provided on the rear side wall of the shell for the button to slide with, and the end face of the button has a limiting ring that abuts against the edge of the extension hole to limit the button from being separated from the extension hole; a return spring is arranged between the button and the assembly plate and is sleeved on the peripheral side of the push rod.

[0012] As a further improvement, the outer shell is concave relative to the opening position of the valve body to form an installation thread groove, and a connecting piece is threaded in the installation thread groove, and the connecting piece has an integrally formed threaded portion, a convex portion and an embedded portion, and through holes for sliding cooperation of the valve stem are provided from the threaded portion to the convex portion and the embedded portion; a screw cover is sleeved on the outer side of the convex portion, and the rear end of the screw cover extends inward to form a rest ring which is sleeved in the embedded groove at the rear end of the convex portion, the inner wall surface of the screw cover has an internal thread, and a threaded ring column threaded on the inside of the screw cover is provided on the outer side of the valve body interface, the valve stem is inserted into the opening of the valve body through the threaded ring column, and the screw cover is tightened to the outer side of the threaded ring column, so that the actuator can be quickly assembled on the valve body.

[0013] As a further improvement, a reset spring is sleeved on the periphery of the valve stem to provide the valve stem with a tendency to move backward; the threaded portion is threadedly engaged in the mounting threaded groove, an internal threaded hole is provided on the inner wall of the embedded portion, a locking sleeve is threaded in the internal threaded hole, a receiving groove for accommodating the reset spring is provided inside the locking sleeve, a contact ring is formed on the periphery of the valve stem near the mounting frame, one force-bearing end of the reset spring contacts the bottom of the receiving groove, and the other end contacts the contact ring.

[0014] As a further improvement, a plug ring which is gradually reduced from front to back is provided at the front end of the embedded part, and a sealing ring which is tightly matched with the inner wall of the opening of the valve body is sleeved on the outer side of the plug ring.

[0015] As a further improvement, a PCB board is embedded on the top wall of the shell, the Hall switch is installed on the PCB board, the top wall of the shell has a detection area, and a touch sensing spring for controlling the start of the drive motor is installed between the detection area of ​​the shell and the PCB board.

[0016] The present application also relates to a method for using a flush valve, using the above-mentioned flush valve, comprising the following steps:

[0017] S1: Turn on the drive motor, and the gears drive the drive wheel on the reduction gear to rotate clockwise. The moving stroke from point A to point B between the mounting bracket and the stop ring area takes 0.5s. The valve stem does not move, the flow channel is closed, and no water flows through the valve body.

[0018] S2: As the driving wheel continues to rotate clockwise, the mounting frame contacts point B in the stop ring area and then contacts point C in the action ring area, which takes 0.5s. The valve stem moves forward axially to push open the valve core and the flow channel. The Hall switch senses the N pole of the magnet and controls the external water source component to supply water into the flow channel.

[0019] S3: According to the flushing mode selected by the user, the pause time of the driving motor is set. The pause time of the first flushing mode is 0.8s, the pause time of the second flushing mode is 0.4s, and there is no pause time in the third flushing mode.

[0020] S4: The drive motor restarts, the drive wheel continues to rotate clockwise, the mounting bracket falls back from the contact state with point C of the action ring area to the contact state with point A of the stop area, the valve stem moves axially backward, the valve core returns to the state of blocking the valve port, the flow channel is closed, the N pole of the magnet is away from the Hall switch, and no water flows through the flow channel at this time. The total time consumption of the first flushing mode is 1.8s, the total time consumption of the second flushing mode is 1.4s, and the total time consumption of the third flushing mode is 1.0s.

[0021] The beneficial effects of the present invention are:

[0022] The present application realizes the opening or closing of the valve core and then the opening or closing of the flow channel by actuating the axial sliding of the valve stem by the driving wheel. The movement stroke of the valve stem is limited by the stop ring area point A, point B and the action ring area point C of the driving wheel and will not exceed the preset range, thereby avoiding the situation in the prior art that the motor will still drive the valve stem to move beyond the specified position under the action of inertia after being turned off; and there is no need to reserve an installation space for installing the travel switch inside the actuator, thereby eliminating the installation steps of installing the component, which is conducive to the miniaturized production of flush valves and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a cross-sectional schematic diagram of the internal structure of the actuator embodied in the present invention;

[0025] Figure 3 It is a structural schematic diagram of the present invention that reflects the matching relationship between each gear and the reduction gear;

[0026] Figure 4 It is a schematic diagram of the state in which the flow channel is opened when the valve stem of the present invention pushes the valve core;

[0027] Figure 5 The present invention Figure 4 The enlarged schematic diagram of point E in the middle;

[0028] Figure 6 It is a schematic diagram of the state in which the flow channel is closed when the valve stem and the valve core are separated from each other;

[0029] Figure 7 It is a schematic diagram of the state of the valve stem of the present invention when it is axially moved backward and is in an initial state;

[0030] Figure 8 It is a schematic diagram of the state of the present invention when the axial forward movement is in a triggered state.

[0031] The accompanying drawings are marked as follows:

[0032] 10. Valve body; 11. Flow channel; 12. Stop spring; 101. Valve port; 102. Opening; 14. Threaded ring column; 20. Actuator; 21. Housing; 211. First gear; 212. Second gear; 213. Third gear; 214. Fourth gear; 215. Fifth gear; 22. Reduction gear; 23. Valve stem; 231. Mounting frame; 232. Magnet; 233. Contact ring; 24. Hall switch; 25. Drive motor; 210. Mounting thread groove; 26. Return spring; 27. Screw cap; 271. Shelf Ring; 28, assembly plate; 281, sliding hole; 29, extension hole; 30, driving wheel; 31, stop ring area; 32, action ring area; 40, valve core; 41, pressure cover part; 42, rod part; 43, sealing gasket; 50, push rod; 51, button; 511, limit ring; 52, return spring; 60, connecting piece; 601, through hole; 61, threaded part; 62, convex edge part; 63, embedded part; 631, plug ring; 64, locking sleeve; 641, accommodating groove; 70, sealing ring; 80, touch sensing spring; 90, PCB board. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] like Figures 1 to 8 As shown, the flush valve includes a valve body 10 and an actuator 20 mounted at an opening 102 of the side wall of the valve body 10. The valve body 10 has a flow channel 11. A valve core 40 for blocking the flow channel 11 is installed at the valve port 101 of the valve body 10. The actuator 20 includes a housing 21, a reduction gear 22 and a valve stem 23. The reduction gear 22 is rotatably mounted inside the housing 21. The valve stem 23 is slidably fitted at the opening 102 of the valve body 10 and the end of the valve stem 23 is opposite to the valve core 40. The valve stem 23 can slide axially when actuated by the reduction gear 22, and the axial movement direction of the valve stem 23 is perpendicular to the axial direction of the reduction gear 22. A magnet 232 is embedded in a mounting frame 231 arranged at the tail of the valve stem 23. A Hall switch 24 is installed on the inner wall surface of the housing 21 close to the mounting frame 231 to cooperate with the magnet 232 to control the opening and closing of water supply in the flow channel 11.

[0035] like Figures 1 to 8 As shown, the end face of the reduction gear 22 is fixed with a driving wheel 30 that contacts and cooperates with the tail end of the mounting frame 231. The driving wheel 30 includes a stop ring area 31 and an action ring area 32 that are connected along the rotation direction. The stop ring area 31 is coaxially fixed with the reduction gear 22. The radius of the action ring area 32 is larger than the stop ring area 31 and the centers of the two circles are staggered. The end where the stop ring area 31 and the action ring area 32 are connected is defined as point B, the opposite end is defined as point A, and the end of the action ring area 32 away from point A is defined as point C. A driving motor 25 for controlling the rotation of the reduction gear 22 is installed in the housing 21. When the driving motor 25 is started and the reduction gear 22 rotates, the mounting frame 231 first contacts the stop ring area 31 from point A to point B. During this process, the end of the valve stem 23 is separated from the valve core 40, and the valve core 40 is sealed. The valve port 101 is blocked, the flow channel 11 is closed, and the Hall switch 24 is away from each other. At this time, the Hall switch 24 is not triggered, and the water supply in the flow channel 11 stops. Then, during the contact process between the mounting frame 231 and the action ring area 32 from point B to point C, the valve stem 23 is actuated by the action ring area 32 with an increased radius, and moves forward axially and pushes open the valve core 40, and the flow channel 11 is opened. The N pole of the magnet 232 passes over the Hall switch 24 toward the direction close to the valve body 10, and the Hall switch 24 is triggered to output a sensing signal to control the external water source component (not shown) to supply water to the flow channel 11. Of course, in other embodiments, it can also be set that when the S pole of the magnet 232 passes over the Hall switch 24, the Hall switch 24 is triggered to output a sensing signal to control the external water source component to supply water to the flow channel 11. It should be noted here that the external water source component used in this application can be an angle valve or other water supply equipment.

[0036] The structures of the various components of the present invention are described below.

[0037] like Figure 2 to Figure 6As shown, it should be noted that the rotation direction of the driving wheel 30 is clockwise. When the reduction gear 22 drives the driving wheel 30 to rotate, the mounting frame 231 first contacts the stop ring area 31 of the driving wheel 30. During the contact process from point A to point B between the mounting frame 231 and the stop ring area 31, the valve stem 23 is not subjected to force and does not undergo axial displacement. The valve body 10 is in an initial state where the flow channel 11 is closed and no water flow is supplied. This process takes 0.5 s. As the driving wheel 30 continues to rotate clockwise, the mounting frame 231 transitions to contact with the action ring area 32 of the driving wheel 30. During the contact process between the mounting frame 231 and the action ring area During the contact process from point B to point C of the stop ring area 32, the action ring area 32 actuates the valve stem 23 to move axially forward, pushes open the valve core 40 and opens the flow channel 11. At this time, the Hall switch 24 is triggered to output a sensing signal and control the external water source to supply water to the flow channel 11. The valve body 10 is in a triggered state in which the flow channel 11 is open and there is water supply. This process takes 0.5s. If the driving wheel 30 continues to rotate clockwise at this time, the mounting frame 231 quickly falls back from point C of the action ring area 32 to the initial state of contact with point A of the stop ring area 31, that is, at this time the flow channel 11 is quickly closed and there is no water supply in the valve body 10.

[0038] like Figure 4 and Figure 6 As shown, the valve core 40 includes an integrally formed pressure cover portion 41 for pressing and blocking the valve port 101 and a rod portion 42 extending downward from the middle of the lower end surface of the pressure cover portion 41. The water inlet end of the valve body 10 is provided with a stop spring 12 for pressing downward the pressure cover portion 41 to make the valve core 40 block and press the valve port 101, and a sealing gasket 43 is interference fit at the valve port 101; when the flow channel 11 is closed, the stop spring 12 presses the pressure cover portion 41 downward and presses it at the valve port 101. At this time, the axis of the rod portion 42 is perpendicular to the axis of the valve stem 23. When the flow channel 11 is opened, the valve stem 23 slides forward and pushes the rod portion 50 42, causing its axis to deviate from the original axial position, driving one side of the pressure cover portion 41 to tilt up to open the valve port 101.

[0039] like Figure 3 As shown, the actuator 20 further includes a first gear 211 rotatably disposed inside the housing 21, a second gear 212 meshing with the first gear 211, a third gear 213 coaxially fixedly disposed on the end face of the second gear 212, a fourth gear 214 meshing with the third gear 213, and a fifth gear 215 coaxially fixedly disposed on the end face of the fourth gear 214 and meshing with the reduction gear 22. The module of each gear is 0.5, the number of teeth of the first gear 211 is 12, the number of teeth of the second gear 212 is 56, the number of teeth of the third gear 213 is 12, the number of teeth of the fourth gear 214 is 56, the number of teeth of the fifth gear 215 is 12, the number of teeth of the reduction gear 22 is 60, and the transmission ratio of the above four-stage transmission is 109.05:23.35:5:1.

[0040] It is worth noting that after multiple tests, the multi-stage gear transmission method is used to drive the axial displacement of the valve stem 23. When the flushing diaphragm is tested at 0.55 MPa, the valve stem 23 can push open the valve core 40 within 1 second, that is, it has the advantage of quickly opening the flow channel 11 and realizing water supply to the flow channel 11.

[0041] like Figure 2 and Figure 7 , Figure 8 As shown, the output shaft of the driving motor 25 is fixedly connected to the first gear 211 to drive the first gear 211 to rotate; a push rod 50 is slidably connected to the rear side wall inside the housing 21 to push the magnet 232 on the mounting frame 231 to slide forward and backward; an assembly plate 28 is fixedly arranged on the rear side wall inside the housing 21, and a sliding hole 281 for the push rod 50 to slide is provided on the assembly plate 28; a button 51 is screwed to the rear end of the push rod 50, and a protruding hole 29 for the button 51 to slide with is provided on the rear side wall of the housing 21, and the end surface of the button 51 has A limit ring 511 abuts against the edge of the extension hole 29 to limit the button 51 from being separated from the extension hole 29; a return spring 52 is provided between the button 51 and the assembly plate 28 and is sleeved on the circumference of the push rod 50; with such a design, the user can choose to use a motor to control the rotation of the drive wheel 30 to actuate the axial sliding of the valve stem 23 according to the specific use environment, or to use a method of synchronously actuating the magnet 232, the mounting frame 231 and the valve stem 23 to slide axially by pressing the push rod 50. Compared with a single use method, the water control valve of the present application has a wider applicability.

[0042] like Figures 4 to 6 As shown, the housing 21 is concave relative to the opening 102 of the valve body 10 to form a mounting thread groove 210, and a connecting piece 60 is threadedly connected in the mounting thread groove 210. The connecting piece 60 has an integrally formed threaded portion 61, a convex portion 62 and an embedded portion 63. A through hole 601 for the valve stem 23 to slide with is provided from the threaded portion 61 to the convex portion 62 and the embedded portion 63. A return spring 26 is sleeved around the valve stem 23 to provide the valve stem 23 with a tendency to move backward; the threaded portion 61 is threadedly connected to the convex portion 62 and the embedded portion 63. The portion 61 is threadedly engaged in the mounting thread groove 210, an internal threaded hole is provided on the inner wall of the embedded portion 63, a locking sleeve 64 is threaded in the internal threaded hole, a receiving groove 641 for accommodating the reset spring 26 is provided inside the locking sleeve 64, a contact ring 233 is formed on the circumference of the valve stem 23 near the mounting frame 231, one force-bearing end of the reset spring 26 contacts the bottom of the receiving groove 641, and the other end contacts the contact ring 233, thereby providing the valve stem 23 with a tendency to move backward.

[0043] like Figures 4 to 6As shown, a screw cap 27 is sleeved on the outer side of the flange 62, and the rear end of the screw cap 27 extends inward to form a rest ring 271 that is sleeved into the embedded groove at the rear end of the flange 62. The inner wall surface of the screw cap 27 has an internal thread, and a threaded ring column 14 that is screwed to the inside of the screw cap 27 is arranged on the outer side of the interface of the valve body 10. The valve stem 23 is inserted into the opening 102 of the valve body 10 through the threaded ring column 14. The screw cap 27 is tightened on the outer side of the threaded ring column 14, and the actuator 20 can be quickly assembled on the valve body 10; a plug ring 631 that is tapered from front to back is provided at the front end of the embedded portion 63, and a sealing ring 70 that is tightly matched with the inner wall of the opening 102 of the valve body 10 is sleeved on the outer side of the plug ring 631; through the arrangement of the sealing ring 70, it is possible to prevent water from flowing into the actuator 20 through the gap between the valve stem 23 and the opening 102, thereby improving the safety of the water control valve during use.

[0044] like Figure 7 and Figure 8 As shown in the figure, a PCB board 90 is embedded on the top wall of the housing 21, the Hall switch 24 is installed on the PCB board 90, the top wall of the housing 21 has a detection area, and a touch sensing spring 80 for controlling the start of the drive motor 25 is installed between the detection area of ​​the housing 21 and the PCB board 90; when the user applies force to the corresponding position of the top wall of the housing 21, due to the thin thickness of the detection area of ​​the housing 21, the pressure applied by the hand indirectly acts on the touch sensing spring 80, and the PCB board 90 detects the electrical connection between the human hand and the touch sensing spring. The capacitance value changes, which is converted into a corresponding electrical signal to control the start of the drive motor 25, the valve stem 23 moves forward axially to open the valve core 40, and the N pole of the magnet 232 approaches the Hall switch 24 to complete a valve opening action (that is, the flow channel 11 is opened, and the water flow channel 11 realizes water supply), and then the valve stem 23 moves backward axially to separate from the valve core 40, and the N pole of the magnet 232 is away from the Hall switch 23 to achieve a valve closing action, at which time the drive motor 25 is turned off; when the user removes the external force, the capacitance value between the touch sensing spring 80 and the hand returns to the initial state. It should be noted here that one touch can only control a flush valve to perform a valve opening and closing action.

[0045] Combine the following Figures 1 to 8 , the working principle of flushing realized by the present invention is described in detail.

[0046] S1: Turn on the driving motor 25, and the gears are driven to drive the driving wheel 30 on the reduction gear 22 to rotate clockwise. The moving stroke from point A to point B between the mounting frame 231 and the stop ring area 31 takes 0.5s. The valve stem 23 does not move, the flow channel 11 is closed, and no water flows through the valve body 10.

[0047] S2: As the driving wheel 30 continues to rotate clockwise, the mounting frame 231 contacts the stop ring area 31B point and then contacts the action ring area 32 point C, which takes 0.5s. The valve stem 23 moves forward axially to push open the valve core 40 and the flow channel 11. The Hall switch 24 senses the N pole of the magnet 232 and controls the external water source component to supply water to the flow channel 11.

[0048] S3: According to the flushing mode selected by the user, the pause time of the driving motor 25 is set. The pause time of the first flushing mode is 0.8s, the pause time of the second flushing mode is 0.4s, and there is no pause time in the third flushing mode.

[0049] S4: the driving motor 25 is restarted, the driving wheel 30 continues to rotate clockwise, the mounting bracket 231 falls back from the state of contact with point C of the action ring area 32 to the state of contact with point A of the stop area, the valve stem 23 moves axially backward, the valve core 40 returns to the state of blocking the valve port 101, the flow channel 11 is closed, and the N pole of the magnet 232 is away from the Hall switch 24. At this time, no water flows through the flow channel 11. The total time consumption of the first flushing mode is 1.8s, the total time consumption of the second flushing mode is 1.4s, and the total time consumption of the third flushing mode is 1.0s.

[0050] The water volumes in the above-mentioned flushing modes are in the following relationship: Class I flushing flow > Class II flushing flow > Class III flushing flow; of course, the length of the motor pause time can be adaptively adjusted according to the water output required by the user to meet the diverse water output needs.

[0051] 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 flush valve, comprising a valve body (10) and an actuator (20) mounted at an opening (102) of a side wall of the valve body (10), the valve body (10) having a flow channel (11), a valve core (40) for blocking the flow channel (11) being mounted at a valve port (101) of the valve body (10), characterized in that: The actuator (20) comprises a housing (21), a reduction gear (22) and a valve stem (23). The reduction gear (22) is rotatably mounted inside the housing (21). The valve stem (23) is slidably fitted at an opening (102) of the valve body (10) and the end of the valve stem (23) is positioned relative to the valve core (40). The valve stem (23) is actuated by the reduction gear (22) to slide axially, and the axial movement direction of the valve stem (23) is perpendicular to the axial direction of the reduction gear (22). The end surface of the reduction gear (22) is fixedly mounted A driving wheel (30) is provided which is in contact with the rear end of the mounting frame (231). The driving wheel (30) comprises a stop ring area (31) and an action ring area (32) which are connected in the rotation direction. The stop ring area (31) is fixedly arranged coaxially with the reduction gear (22). The radius of the action ring area (32) is larger than that of the stop ring area (31) and the centers of the two circles are staggered. The end where the stop ring area (31) and the action ring area (32) are connected is defined as point B, the opposite end is defined as point A, and the end of the action ring area (32) away from point A is defined as point C. A driving motor (25) for controlling the rotation of the reduction gear (22) is installed in the housing (21). When the driving motor (25) and the reduction gear (22) are started, the mounting frame (231) first contacts the stop ring area (31) from point A to point B, and the end of the valve stem (23) is separated from the valve core (40). The valve core (40) blocks the valve port (101) and the flow channel (11) is closed. Subsequently, when the mounting frame (231) contacts the action ring area (32) from point B to point C, the valve stem (23) is actuated by the action ring area (32) with an increased radius, moves axially forward, and pushes the valve core (40) open, and the flow channel (11) is opened.

2. A flush valve according to claim 1, characterized in that: A magnet (232) is embedded in a mounting frame (231) arranged at the tail of the valve stem (23), and a Hall switch (24) is installed on the inner wall surface of the housing (21) close to the mounting frame (231) to cooperate with the magnet (232) in magnetic induction to control the opening and closing of water supply in the flow channel (11).

3. A flush valve according to claim 1, characterized in that: The actuator (20) further comprises a first gear (211) rotatably arranged inside the housing (21), a second gear (212) meshing with the first gear (211), a third gear (213) coaxially fixed on the end surface of the second gear (212), a fourth gear (214) meshing with the third gear (213), and a fifth gear (215) coaxially fixed on the end surface of the fourth gear (214) and meshing with the reduction gear (22); the module of each gear is 0.5, the number of teeth of the first gear (211) is 12, the number of teeth of the second gear (212) is 56, the number of teeth of the third gear (213) is 12, the number of teeth of the fourth gear (214) is 56, the number of teeth of the fifth gear (215) is 12, and the number of teeth of the reduction gear (22) is 60. The transmission ratio of the above four-stage transmission is 109.05:23.35:5:

1.

4. A flush valve as claimed in claim 3, characterized in that: The output shaft of the driving motor (25) is fixedly connected to the first gear (211) and is used to drive the first gear (211) to rotate; a push rod (50) is slidably connected to the rear side wall inside the housing (21) and is used to push the magnet (232) on the mounting frame (231) to slide forward and backward; an assembly plate (28) is fixedly arranged on the rear side wall inside the housing (21) at intervals, and a sliding hole (281) for sliding connection of the push rod (50) is provided on the assembly plate (28); a button (51) is screwed to the rear end of the push rod (50), and an extension hole (29) for sliding cooperation with the button (51) is provided on the rear side wall of the housing (21), and the end surface of the button (51) has a limiting ring (511) that abuts against the edge of the extension hole (29) to limit the button (51) from being separated from the extension hole (29); a return spring (52) is arranged between the button (51) and the assembly plate (28) and is sleeved on the peripheral side of the push rod (50).

5. A flush valve as claimed in claim 1, characterized in that: The housing (21) is concavely formed at a position relative to the opening (102) of the valve body (10) to form a mounting thread groove (210), a connecting piece (60) is threadedly connected in the mounting thread groove (210), the connecting piece (60) comprises an integrally formed threaded portion (61), a convex portion (62) and an embedded portion (63), a through hole (601) for the valve stem (23) to slide with is provided from the threaded portion (61) to the convex portion (62) and the embedded portion (63); a screw cap (27) is sleeved on the outer side of the convex portion (62) The rear end of the rotary cover (27) extends inward to form a rest ring (271) which is inserted into the groove at the rear end of the convex edge (62). The inner wall surface of the rotary cover (27) has an internal thread. A threaded ring column (14) which is screwed to the inside of the rotary cover (27) is arranged on the outside of the interface of the valve body (10). The valve stem (23) is inserted into the opening (102) of the valve body (10) through the threaded ring column (14). The rotary cover (27) is screwed onto the outer side of the threaded ring column (14), and the actuator (20) can be quickly assembled on the valve body (10).

6. A flush valve as claimed in claim 5, characterized in that: A return spring (26) is sleeved on the circumferential side of the valve stem (23) to provide the valve stem (23) with a tendency to move backward; the threaded portion (61) is threadedly engaged in the mounting threaded groove (210), an internal threaded hole is provided on the inner wall of the embedded portion (63), a locking sleeve (64) is threaded in the internal threaded hole, a receiving groove (641) for accommodating the return spring (26) is provided inside the locking sleeve (64), a contact ring (233) is formed on the circumferential side of the valve stem (23) near the mounting frame (231), one force-bearing end of the return spring (26) contacts the bottom of the receiving groove (641), and the other end contacts the contact ring (233).

7. A flush valve as claimed in claim 5, characterized in that: A plug ring (631) which tapers from front to back is provided at the front end of the embedded portion (63), and a sealing ring (70) which is tightly fitted with the inner wall of the opening (102) of the valve body (10) is sleeved on the outer side of the plug ring (631).

8. A flush valve as claimed in claim 2, characterized in that: A PCB board (90) is embedded on the top wall of the housing (21), a Hall switch (24) is mounted on the PCB board (90), the top wall of the housing (21) has a detection area, and a touch sensing spring (80) for controlling the start of a drive motor (25) is mounted between the detection area of ​​the housing (21) and the PCB board (90).

9. A method for using a flush valve, using the flush valve of claim 2, characterized in that: The following steps are involved: S1: Turn on the driving motor (25), and the gears are driven to drive the driving wheel (30) on the reduction gear (22) to rotate clockwise. The moving stroke of the mounting frame (231) and the stop ring area (31) from point A to point B takes 0.5 seconds. The valve stem (23) does not move, the flow channel (11) is closed, and no water flows through the valve body (10); S2: As the driving wheel (30) continues to rotate clockwise, the mounting frame (231) contacts point B of the stop ring area (31) and transitions to contact point C of the action ring area (32) for 0.5 seconds, the valve stem (23) moves axially forward to push open the valve core (40) and open the flow channel (11), the Hall switch (24) senses the N pole of the magnet (232) and controls the external water source component to supply water into the flow channel (11); S3: According to the flushing mode selected by the user, the pause time of the driving motor (25) is set, the pause time of the first flushing mode is 0.8s, the pause time of the second flushing mode is 0.4s, and there is no pause time in the third flushing mode. S4: the driving motor (25) is restarted, the driving wheel (30) continues to rotate clockwise, the mounting frame (231) falls back from the contact state with point C of the action ring area (32) to the contact state with point A of the stop area, the valve stem (23) moves axially backward, the valve core (40) returns to the state of blocking the valve port (101), the flow channel (11) is closed, and the N pole of the magnet (232) is away from the Hall switch (24). At this time, no water flows through the flow channel (11). The total time consumption of the first flushing mode is 1.8s, the total time consumption of the second flushing mode is 1.4s, and the total time consumption of the third flushing mode is 1.0s.

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