Electric valve, electric valve control method and household appliance

Abstract

The present invention provides an electric valve, a control method of the electric valve and a household appliance. The electric valve comprises: a valve body; a valve core rotatably arranged in the valve body; a limit structure for limiting the rotation range of the valve core; a drive structure connected to the valve core and controlling the rotation of the valve core; a control device connected to the drive structure, and the control device is configured to control the drive structure to cut off power according to the current change in the drive structure. The technical solution of the present invention solves the problems of low control accuracy and instability of the control motor of the electric ball valve using a micro switch in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an electric valve, a control method of the electric valve and a household appliance. Background Art

[0002] The water purifier is equipped with an electric ball valve for draining wastewater. Most of the electric ball valves currently on the market use micro switches to control whether the motor stops rotating. Specifically, when the valve core rotates to the open position, the micro switch is triggered and transmits a signal to the control board, which controls the motor to stop rotating. The control method of the above electric ball valve requires more connecting wires to transmit signals, and the accuracy of the signal transmitted by the micro switch is not very high. At the same time, the elastic key of the micro switch will deform under long-term working conditions, making the signal transmission function more unstable. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the low control accuracy and instability defects of the control motor of the electric ball valve using a micro switch in the prior art, thereby providing an electric valve, an electric valve control method and a household appliance.

[0004] In order to solve the above problems, the present invention provides an electric valve, including: a valve body; a valve core, rotatably arranged in the valve body; a limiting structure, used to limit the rotation range of the valve core; a driving structure, connected to the valve core and controlling the rotation of the valve core; a control device, connected to the driving structure, and the control device is configured to control the power off of the driving structure according to the current change in the driving structure.

[0005] Optionally, the electric valve further includes a discharge structure, which is connected to the drive structure and the discharge structure is connected to the control device. The control device is also configured to control the discharge structure to energize the drive structure and cause the drive structure to rotate in the opposite direction after the drive structure is powered off.

[0006] Optionally, the control device includes a control circuit board and a power control device for changing the power-on state of the control circuit board. The discharge structure is a capacitor arranged on the control circuit board. After the control circuit board controls the driving structure to be powered off, the power control device controls the circuit board to be powered off so that the capacitor powers on the driving structure and causes the driving structure to rotate in the opposite direction.

[0007] Optionally, the electric valve further includes a transmission assembly, and the transmission assembly is arranged between the drive structure and the valve core.

[0008] Optionally, the transmission assembly includes: a first gear, the driving structure drives the first gear to rotate; a second gear, connected to the valve core and concentrically arranged, and the first gear drives the second gear to rotate.

[0009] Optionally, the limiting structure cooperates with the first gear and / or the second gear to limit the rotational position of the first gear and / or the second gear.

[0010] Optionally, the limiting structure includes two limiting ribs, the second gear is fan-shaped, and the two limiting ribs respectively cooperate with two side edges of the second gear, wherein the valve core has an open position and a closed position, when the valve core is in the open position, one side edge of the second gear abuts against one of the two limiting ribs, and when the valve core is in the closed position, the other side edge of the second gear abuts against the other of the two limiting ribs.

[0011] Optionally, the transmission assembly further includes a third gear, which is disposed between the first gear and the second gear and meshes with the first gear and the second gear.

[0012] Optionally, a water inlet and a water outlet are provided on the valve body, a flow channel is provided in the valve core, and the valve core has an open position and a closed position, wherein when the valve core is in the open position, the flow channel connects the water inlet and the water outlet, and when the valve core is in the closed position, the flow channel is misaligned with the water inlet and / or the water outlet, and when the valve core is in the open position, the control device controls the drive structure to cut off power.

[0013] Optionally, the central axis of the water inlet and the central axis of the water outlet are arranged vertically, and the flow channel is L-shaped.

[0014] Optionally, the drive structure and the valve body are arranged side by side.

[0015] Optionally, a mounting groove is provided on the valve core, and the electric valve further comprises a sealing ring arranged in the mounting groove, and when the valve core is in a closed position, the sealing ring cooperates with the water inlet and / or the water outlet.

[0016] Optionally, the electric valve further comprises a housing, the valve body is arranged on the housing, and the limiting structure, the driving structure, the control device and the transmission assembly are arranged in the housing.

[0017] The present invention also provides a control method for an electric valve, which is the electric valve mentioned above, and the control method includes: step S1: the control device energizes the driving structure, and causes the driving structure to drive the valve core to rotate in a first direction; step S2: when the limiting structure limits the position of the valve core and stops it from rotating, the control device cuts off the power to the driving structure according to the current change of the driving structure.

[0018] Optionally, the control method further includes: Step S3: after the driving structure is powered off, the discharge structure supplies power to the driving structure, and causes the driving structure to drive the valve core to rotate in a second direction opposite to the first direction.

[0019] Optionally, the control device determines the current change in the drive structure through a preset program and controls the drive structure to cut off power.

[0020] The present invention further provides a household appliance, comprising an electric valve, wherein the electric valve is the electric valve mentioned above.

[0021] Optionally, the household appliance is a water purifier.

[0022] The present invention has the following advantages:

[0023] In the technical solution of the present invention, the driving structure drives the valve core to rotate, and when the limiting structure limits the valve core and stops it from rotating, the current in the driving structure changes accordingly. At this time, the control device controls the driving structure to cut off the power according to the signal of the change in the current in the driving structure, and the valve core stops rotating. Since the current changes very quickly, the above control method has a fast response and high control accuracy. At the same time, a micro switch for judging the position is not provided, there is no problem of aging of components, and the structure is more stable and durable. Therefore, the technical solution of the present invention solves the problems of low control accuracy and instability of the control motor of the electric ball valve using a micro switch in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A cross-sectional schematic diagram of an embodiment of an electric valve provided according to the present invention is shown;

[0026] Figure 2 Shows Figure 1 A schematic cross-sectional view of the electric valve from a top view; and

[0027] Figure 3 Shows Figure 1 A schematic cross-sectional view of the electric valve from a bottom-up perspective.

[0028] Description of reference numerals:

[0029] 10. Valve body; 11. Water inlet; 12. Water outlet; 20. Valve core; 21. Flow channel; 22. Mounting groove; 30. Limiting structure; 40. Driving structure; 50. Control device; 60. Discharge structure; 70. Transmission assembly; 71. First gear; 72. Second gear; 73. Third gear; 80. Sealing ring; 90. Housing; 100. Speed ​​reduction mechanism. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] like Figure 1 and Figure 2 As shown, the electric valve in this embodiment includes a valve body 10, a valve core 20, a limiting structure 30, a driving structure 40 and a control device 50. The valve core 20 is rotatably arranged in the valve body 10. The limiting structure 30 is used to limit the rotation range of the valve core 20. The driving structure 40 is connected to the valve core 20 and controls the rotation of the valve core 20. The control device 50 is connected to the driving structure 40, and the control device 50 is configured to control the driving structure 40 to cut off power according to the current change in the driving structure 40.

[0035] By applying the technical solution of this embodiment, the driving structure 40 drives the valve core 20 to rotate. When the limiting structure 30 limits the valve core 20 and stops it from rotating, the current in the driving structure 40 changes accordingly. At this time, the control device 50 controls the driving structure 40 to cut off the power according to the signal of the change of the current in the driving structure 40, and the valve core 20 stops rotating. Since the current changes very quickly, the above control method has a fast response and high control accuracy. At the same time, a micro switch for judging the position is not provided, there is no problem of aging of components, and the structure is more stable and durable. Therefore, the technical solution of the embodiment solves the problems of low control accuracy and instability in the prior art of using a micro switch to control the motor of an electric ball valve.

[0036] Preferably, in the technical solution of this embodiment, the control device 50 determines the current change in the drive structure 40 through a preset program and controls the drive structure 40 to cut off the power. Specifically, when the valve core 20 is limited by the limiting structure 30 and stops rotating, since the drive structure 40 is not powered off, the current in the drive structure 40 will increase rapidly. By programming a preset program in the control device 50, when the current in the drive structure 40 increases, the control device 50 directly controls the drive structure 40 to cut off the power, thereby preventing the current in the drive structure 40 from further increasing. Therefore, in this embodiment, no micro switch and sensor are provided, and the technical effect of quickly cutting off the power of the drive structure 40 can be achieved.

[0037] like Figure 1 As shown, in the technical solution of this embodiment, the electric valve further includes a discharge structure 60, and the discharge structure 60 is connected to the drive structure 40 and the control device 50. The control device 50 is also configured to control the discharge structure 60 to energize the drive structure 40 after the drive structure 40 is powered off. Specifically, when the control device 50 controls the drive structure 40 to be powered off, the discharge structure 60 energizes the drive structure 40. The purpose of the above operation is to provide current to the drive structure 40 through the discharge structure 60 and make the drive structure 40 run in reverse, so as to reset the valve core 20.

[0038] like Figure 1 and Figure 2As shown, in the technical solution of this embodiment, the control device 50 is a control circuit board and a power control device for changing the power-on state of the control circuit board, and the discharge structure 60 is a capacitor arranged on the control circuit board. And preferably, the drive structure 40 is a motor. After the control device 50 controls the drive structure 40 to be powered off, the capacitor provides power to the drive structure 40. Specifically, when the valve core 20 is limited by the limiting structure 30 and stops rotating, the current in the motor rises rapidly, and the control circuit board controls the motor to be powered off. After the motor is powered off, the control circuit board is not powered off for a period of time, and the capacitor is still in a charging state. When the power control device powers off the control circuit board, the capacitor powers on the motor and causes the motor to rotate in the opposite direction, thereby returning the valve core 20.

[0039] Furthermore, in this embodiment, the capacitor and the motor are in the same circuit. When the external power supply supplies power to the motor, the external power supply also charges the capacitor, and at this time the capacitor does not provide power to the motor. When the control circuit board controls the motor to be powered off, and the power supply control device powers off the control circuit board, the external power supply no longer provides power to the control board. At this time, the capacitor supplies power to the motor and causes the motor to rotate in the opposite direction, thereby driving the valve core 20 to reset. Based on the above description, the working mode of the electric valve in this application is described in detail below:

[0040] 1. When the valve core 20 needs to rotate, the control circuit board controls the external power supply to energize the motor, and the motor drives the valve core 20 to rotate after being energized. At the same time, the external power supply also charges the capacitor;

[0041] 2. When the valve core 20 rotates to the preset position, the limit structure 30 stops the valve core 20 from rotating. At this time, the motor is stuck and the current in the motor increases rapidly. After the preset program in the control circuit board detects the above current increase, the control motor is powered off;

[0042] 3. After the motor is powered off, the control circuit board remains powered for a period of time. At this time, the capacitor is in a charging state and the motor is in a stationary state;

[0043] 4. After a period of time, the power control device cuts off the power to the control circuit board. At this time, the capacitor acts as a power source and energizes the motor, driving the motor to rotate in the reverse direction, and the valve core 20 is reset;

[0044] 5. When the valve core 20 needs to be rotated again, repeat the above steps.

[0045] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the electric valve further includes a transmission assembly 70, and the transmission assembly 70 is arranged between the motor and the valve core 20. Specifically, the motor drives the valve core 20 to rotate through the transmission assembly 70.

[0046] like Figure 1 As shown, a speed reduction mechanism 100 is also provided in the embodiment, and the speed reduction mechanism 100 is provided between the motor and the transmission assembly 70. Specifically, the speed reduction mechanism 100 is a speed reducer, and the speed reducer is provided below the motor, and the motor shaft of the motor is connected to the input shaft of the speed reducer.

[0047] like Figure 2 As shown, in the technical solution of this embodiment, the transmission assembly 70 includes a first gear 71 and a second gear 72. The first gear 71 is connected to the output shaft of the reducer, and the first gear 71 is driven to rotate when the motor rotates. The second gear 72 is connected to the valve core 20 and is concentrically arranged, and the first gear 71 drives the second gear 72 to rotate. Specifically, after the motor is powered on, the motor shaft of the motor drives the first gear 71 to rotate, the first gear 71 drives the second gear 72 to rotate, and the second gear 72 drives the valve core 20 to rotate. Further, the valve core 20 and the second gear 72 are connected by a connecting shaft, and the two are concentrically arranged.

[0048] like Figure 2 As shown, in the technical solution of this embodiment, the second gear 72 is fan-shaped, and the limiting structure 30 is a limiting convex rib, which is suitable for abutting against the side of the second gear 72. Specifically, when the valve core 20 rotates to the right position, the side of the second gear 72 abuts against the limiting convex rib, so that the second gear 72, the first gear 71 and the valve core 20 are stuck and can no longer rotate. At the same time, the motor is stuck, causing the current in the motor to increase rapidly.

[0049] like Figure 2 As shown, in the technical solution of the present embodiment, there are two limit ribs. The valve core 20 has an open position and a closed position, and the two limit ribs cooperate with the two side edges of the second gear 72 respectively to limit the valve core 20 from rotating between the open position and the closed position. Specifically, the above-mentioned control circuit board controls the motor to be powered off, and the motor is powered off after the valve core 20 moves from the closed position to the open position. After the motor is powered off, the capacitor energizes the motor and causes the valve core 20 to move from the open position back to the closed position and reset. Preferably, the second gear 72 in the present embodiment is a semicircular structure, and the stop surfaces of the two limit ribs are set at 90 degrees. Of course, the specific shape of the first gear 71 and the position of the two limit ribs can be adaptively adjusted by those skilled in the art according to the angle at which the valve core 20 needs to rotate.

[0050] like Figure 2As shown, in the technical solution of this embodiment, the transmission assembly 70 further includes a third gear 73, which is disposed between the first gear 71 and the second gear 72 and meshes with the first gear 71 and the second gear 72. Specifically, the third gear 73 serves as an intermediate gear, which facilitates adjusting the transmission ratio between the motor and the valve core 20 in a small space of the electric valve. Of course, the third gear 73 may not be disposed, so that the first gear 71 and the second gear 72 are directly meshed.

[0051] like Figure 3 As shown, in the technical solution of this embodiment, a water inlet 11 and a water outlet 12 are provided on the valve body 10, and a flow channel 21 is provided in the valve core 20, and the valve core 20 has the above-mentioned open position and closed position. Among them, when the valve core 20 is in the open position, the flow channel 21 connects the water inlet 11 and the water outlet 12, when the valve core 20 is in the closed position, the flow channel 21 is misaligned with the water inlet 11 and / or the water outlet 12, and when the valve core 20 is in the open position, the control device 50 controls the drive structure 40 to cut off the power. Preferably, the electric valve of the present application is used in a water purifier, and the electric valve is used to discharge waste water. When the valve core 20 is in the open position, the flow channel 21 connects the water inlet 11 and the water outlet 12, and the water can be discharged at this time. When the valve core 20 is in the closed position, the flow channel 21 separates the water inlet 11 and the water outlet 12, and the water cannot be discharged at this time. There are many ways for the flow passage 21 to separate the water inlet 11 and the water outlet 12 , for example, the opening of the flow passage 21 can be offset from one or both of the water inlet 11 and the water outlet 12 .

[0052] Further, in combination with the above description of the working process of the electric valve, those skilled in the art can understand that when the water purifier needs to drain water, the drainage function is started, and the external power supply supplies power to the motor. At this time, the motor drives the valve core 20 to rotate to the open position, and the waste water is discharged through the water inlet 11, the flow channel 21 and the water outlet 12. In this process, the external power supply also charges the capacitor. When the valve core 20 moves to the open position, the limit convex rib stops the second gear 72, the motor is stuck, and the current in the motor increases rapidly. At this time, the preset program in the control circuit board controls the motor to power off. After the motor is powered off, the control circuit board is not powered off for a period of time. At this time, the motor is in a stopped state and the valve core is in an open position. After a period of time, the power control device causes the control circuit board to power off. At this time, the capacitor acts as a power source and energizes the motor and drives the valve core 20 to rotate in the opposite direction to the closed position to achieve reset. Therefore, in the above process, the time from the valve core 20 moving to the open position to the control circuit board being powered off and the capacitor driving the motor to rotate in the opposite direction is the drainage time, and the above corresponding time can be adjusted by program design. Preferably, the drainage time in this embodiment is about 3 seconds.

[0053] like Figure 3As shown, in the technical solution of this embodiment, the central axis of the water inlet 11 and the central axis of the water outlet 12 are arranged vertically, and the flow passage 21 is L-shaped. And preferably, the drive structure 40 and the valve body 10 are arranged side by side. Specifically, in the prior art electric valve, the water inlet and the water outlet are arranged in a straight line, so the motor needs to be placed above the valve body. Figure 1 and Figure 3 It can be seen that, since the water inlet 11 and the water outlet 12 are arranged vertically in this embodiment, the space on the side of the valve body 10 can be vacated, so that the motor can be placed side by side on the side of the valve body 10, and it is no longer necessary to place the motor on the top of the valve body 10, which is conducive to the miniaturization design of the electric valve. Furthermore, since the motor and the valve body 10 are arranged side by side, the transmission assembly 70 can be arranged below the two and the transmission ratio can be controlled to ensure that the movement of the valve core 20 is more stable.

[0054] like Figure 3 As shown, in the technical solution of this embodiment, a mounting groove 22 is provided on the valve core 20, and the electric valve further includes a sealing ring 80 provided in the mounting groove 22, and when the valve core 20 is in the closed position, the sealing ring 80 cooperates with the water inlet 11 and / or the water outlet 12. Specifically, the mounting groove 22 is provided on the outer wall of the valve core 20, and when the valve core 20 is in the closed position, the sealing ring 80 cooperates with the water inlet 11 or the water outlet 12, thereby ensuring that the drainage does not flow out along the gap between the valve body 10 and the valve core 20. Preferably, only one sealing ring 80 is provided in the present application, and when the valve core 20 is in the closed position, the sealing ring 80 cooperates with the water inlet 11. Of course, in some embodiments not shown, the sealing ring 80 can also be provided as two, that is, when the valve core 20 is in the closed position, the two sealing rings 80 cooperate with the water inlet 11 and the water outlet 12 respectively.

[0055] like Figure 1 As shown, in the technical solution of this embodiment, the electric valve also includes a housing 90, the valve body 10 is arranged on the housing 90, and the limiting structure 30, the driving structure 40, the control device 50 and the transmission assembly 70 are arranged in the housing 90. Further, since the motor is arranged side by side on the side of the valve body 10, in order to facilitate the arrangement of the motor, the housing 90 is provided with a protrusion at the position corresponding to the side of the valve body 10, and the motor is arranged in the protrusion. The first gear 71, the second gear 72, the third gear 73, the control circuit board and the capacitor are all arranged below the valve body 10 and the motor. A power line is arranged on the side of the housing.

[0056] According to the above structure, this embodiment further provides a method, including:

[0057] Step S1: the control device 50 energizes the driving structure 40, and causes the driving structure 40 to drive the valve core 20 to rotate in a first direction;

[0058] Step S2: When the limiting structure 30 limits the position of the valve core 20 and stops the valve core 20 from rotating, the control device 50 cuts off the power to the driving structure 40 according to the current change of the driving structure 40 .

[0059] Step S3: After the driving structure 40 is powered off, the discharge structure 60 supplies power to the driving structure 40 and causes the driving structure 40 to drive the valve core 20 to rotate in a second direction opposite to the first direction.

[0060] This embodiment also provides a household appliance, the household appliance includes an electric valve, and the electric valve is the above-mentioned electric valve. Preferably, the household appliance is a water purifier. Of course, other household appliances can also use the above-mentioned electric valve, such as air conditioners, washing machines, etc.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An electric valve, characterized in that: include: A valve body (10), wherein the valve body (10) is provided with a water inlet (11) and a water outlet (12); A valve core (20) is rotatably arranged in the valve body (10), a flow passage (21) is arranged in the valve core (20), and the valve core (20) has an open position and a closed position, wherein when the valve core (20) is in the open position, the flow passage (21) communicates with the water inlet (11) and the water outlet (12), and when the valve core (20) is in the closed position, the flow passage (21) is misaligned with the water inlet (11) and / or the water outlet (12); A limiting structure (30) for limiting the rotation range of the valve core (20); A driving structure (40) connected to the valve core (20) and controlling the rotation of the valve core (20); a control device (50) connected to the drive structure (40), the control device (50) being configured to control the drive structure (40) to be powered off according to a change in current in the drive structure (40), and when the valve core (20) is in the open position, the control device (50) controls the drive structure (40) to be powered off, The electric valve further comprises a discharge structure (60), wherein the discharge structure (60) is connected to the drive structure (40), and the discharge structure (60) is connected to the control device (50), and the control device (50) is further configured to control the discharge structure (60) to energize the drive structure (40) and cause the drive structure (40) to rotate in the reverse direction after the drive structure (40) is powered off. The time from the movement of the valve core (20) to the open position to the reverse rotation of the driving structure (40) is the drainage time.

2. The electric valve according to claim 1, characterized in that: The control device (50) comprises a control circuit board and a power control device for changing the power-on state of the control circuit board; the discharge structure (60) is a capacitor arranged on the control circuit board; after the control circuit board controls the drive structure (40) to be powered off, the power control device controls the circuit board to be powered off, so that the capacitor powers on the drive structure (40) and causes the drive structure (40) to rotate in the opposite direction.

3. The electric valve according to claim 1, characterized in that: The electric valve further comprises a transmission assembly (70), wherein the transmission assembly (70) is arranged between the drive structure (40) and the valve core (20).

4. The electric valve according to claim 3, characterized in that: The transmission assembly (70) comprises: A first gear (71), wherein the driving structure (40) drives the first gear (71) to rotate; The second gear (72) is connected to the valve core (20) and is arranged concentrically, and the first gear (71) drives the second gear (72) to rotate.

5. The electric valve according to claim 4, characterized in that: The limiting structure (30) cooperates with the first gear (71) and / or the second gear (72) to limit the rotational position of the first gear (71) and / or the second gear (72).

6. The electric valve according to claim 5, characterized in that: The limiting structure (30) includes two limiting ribs, the second gear (72) is fan-shaped, and the two limiting ribs respectively cooperate with two side edges of the second gear (72), wherein the valve core (20) has an open position and a closed position, when the valve core (20) is in the open position, one side edge of the second gear (72) abuts against one of the two limiting ribs, and when the valve core (20) is in the closed position, the other side edge of the second gear (72) abuts against the other of the two limiting ribs.

7. The electric valve according to claim 4, characterized in that: The transmission assembly (70) further comprises a third gear (73), wherein the third gear (73) is arranged between the first gear (71) and the second gear (72) and meshes with the first gear (71) and the second gear (72).

8. The electric valve according to claim 1, characterized in that: The central axis of the water inlet (11) and the central axis of the water outlet (12) are arranged vertically, and the flow passage (21) is L-shaped.

9. The electric valve according to claim 1, characterized in that: The driving structure (40) and the valve body (10) are arranged side by side.

10. The electric valve according to claim 1, characterized in that: The valve core (20) is provided with a mounting groove (22), and the electric valve further comprises a sealing ring (80) arranged in the mounting groove (22); when the valve core (20) is in the closed position, the sealing ring (80) cooperates with the water inlet (11) and / or the water outlet (12).

11. The electric valve according to claim 3, characterized in that: The electric valve further comprises a housing (90), the valve body (10) is arranged on the housing (90), and the limiting structure (30), the driving structure (40), the control device (50) and the transmission assembly (70) are arranged in the housing (90).

12. A control method for an electric valve, characterized in that: The electric valve is the electric valve according to any one of claims 1 to 11, and the control method comprises: Step S1: the control device (50) supplies power to the driving structure (40), and causes the driving structure (40) to drive the valve core (20) to rotate in a first direction; Step S2: When the position limiting structure (30) limits the position of the valve core (20) and stops its rotation, the control device (50) cuts off the power to the drive structure (40) according to the current change of the drive structure (40).

13. The control method according to claim 12, characterized in that: The electric valve is the electric valve described in claim 2, and the control method further includes: Step S3: after the driving structure (40) is powered off, the discharge structure (60) supplies power to the driving structure (40), and causes the driving structure (40) to drive the valve core (20) to rotate in a second direction opposite to the first direction.

14. The control method according to claim 12, characterized in that: The control device (50) determines the current change in the drive structure (40) through a preset program and controls the drive structure (40) to cut off power.

15. A household appliance, comprising an electric valve, characterized in that: The electric valve is the electric valve according to any one of claims 1 to 11.

16. The household appliance according to claim 15, characterized in that: The household appliance is a water purifier.

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