A water inlet valve assembly for a dishwasher and a control method thereof

Abstract

The present invention discloses a water inlet valve assembly and control method for a dishwasher. The water inlet valve assembly includes an inlet valve, a seal, and mutually perpendicular water inlet and outlet pipes. The seal is controlled to move by the inlet valve, with its sealing end face parallel to or inclined at an angle to the water inlet pipe; the outlet pipe is connected to the water inlet of the dishwasher. The control method includes: setting the frequency of dishwasher use and the number of times the water inlet valve is opened and closed, as well as the corresponding durations; prompting via a manual interaction interface whether to initiate a "rinse program"; using a control unit to cause the seal to continuously open and close the sealing opening according to the set number of times and opening durations, allowing water in the water inlet pipe to flush the seal; and then entering the dishwasher's water filling program. The water inlet valve assembly of the present invention can effectively solve problems such as the sealing end face of the switch channel seal of the water inlet valve assembly being unable to open due to tight sealing adhesion to the sealing opening, or the valve seal being loose due to the accumulation of impurities and scale products on the sealing end face.

Description

Technical Field

[0001] The present invention belongs to the technical field of dishwashers, and particularly relates to a dishwasher water inlet valve assembly and a control method thereof. Background Art

[0002] Currently, if a dishwasher is not used for a long time, the sealing end face of the water inlet valve switch channel seal and the sealing port will continue to adhere due to the seal, which is prone to valve sticking. As a result, the water inlet valve assembly cannot be opened and the water inlet function cannot be realized.

[0003] Furthermore, because the dishwasher's water inlet valve is located before the respirator, impurities and scale will inevitably remain in the waterway after prolonged use. During the water intake process, these impurities and scale buildup pass through the water inlet pipe and the valve's inlet line. When the valve is closed after water intake is complete, these impurities and scale buildup gradually accumulate inside the valve, particularly on the sealing surface of the valve's switch channel. Over time, the inlet valve may lose its seal, potentially allowing tap water to enter the dishwasher directly through the sealing surface and spill into the cabinets, posing a safety hazard. Summary of the Invention

[0004] The purpose of the present invention is to first provide a dishwasher water inlet valve assembly to solve the problem that the sealing end face of the switch channel seal of the water inlet valve assembly and the sealing port cannot be opened due to too tight sealing adhesion or the valve seal is not tight due to the accumulation of impurities and scale products on the sealing end face.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A water inlet valve assembly for a dishwasher comprises a water inlet valve, a sealing member, a water inlet pipe, and a water outlet pipe, wherein the center lines of the water inlet pipe and the water outlet pipe are perpendicular to each other; the sealing member is located at a sealing port provided at the connection between the water inlet pipe and the water outlet pipe, and the sealing end surface of the sealing member is parallel to the water inlet pipe or inclined at an angle less than 60 degrees; the sealing member is connected to the water inlet valve and is controlled to move by the water inlet valve to open or close the sealing port between the water inlet pipe and the water outlet pipe; and the water outlet pipe is connected to the water inlet of the dishwasher.

[0007] A further technical solution of the present invention is:

[0008] The water inlet valve includes a valve body and a valve stem connected to the valve body; a connecting seat is provided at the connection between the water inlet pipe and the water outlet pipe, and the connecting seat is provided with a cavity, and the sealing port, the water inlet connected to the water inlet pipe and the water outlet connected to the water outlet pipe are respectively provided in the cavity, and the center lines of the water inlet and the water outlet are perpendicular to each other; the sealing component is located in the cavity, one end with a sealing end face is located at the sealing port position, and the other end is connected to one end of the valve stem, and the other end of the valve stem is placed in the valve body.

[0009] Furthermore, a retaining wall is provided in the cavity, and the sealing port is provided on the retaining wall.

[0010] The fitting surface between the sealing opening and the sealing end surface is higher than the lowest point of the water inlet.

[0011] The sealing end surface of the sealing member is provided with a sealing ring or a sealing gasket.

[0012] The present invention also provides a method for controlling a water inlet valve assembly, comprising the following steps:

[0013] The frequency of use of the dishwasher per unit time is matched to the preset number of opening and closing times and the opening and closing duration of the water inlet valve;

[0014] Provides a manual interactive interface for users to choose. When the dishwasher is started, it prompts whether to start the "rinsing program". If you select "yes", it will enter the next program; if you select "no", it will directly enter the dishwasher water filling program;

[0015] According to the user's instructions, prompt the user to set the usage frequency;

[0016] Entering the flushing program, the valve stem of the water inlet valve drives the seal to continuously open and close the sealing port according to the number of times and duration set by the user under the control of the control unit, so that the water in the water inlet pipe flushes the seal;

[0017] After the rinsing is completed, the control unit closes the water inlet valve, connects the water inlet pipe and the water outlet pipe, and enters the dishwasher water filling program.

[0018] In the above-mentioned control method of the water inlet valve assembly:

[0019] The preset number of times and duration of opening and closing of the water inlet valve are inversely proportional to the frequency of use of the dishwasher per unit time.

[0020] The preset opening time length T1 of the water inlet valve is greater than the closing time length T2.

[0021] The preset opening time T1 of the water inlet valve is: 1s≤T1≤3s, and the preset closing time T2 is: 0.5s≤T2≤2s.

[0022] Compared with the prior art, the technical effects of the present invention are mainly reflected in: before the dishwasher executes the water filling program, according to the weekly usage frequency set by the user, by controlling the continuous opening and closing actions of the water inlet valve in the present invention, it is avoided that the sealing end face of the switch channel seal of the dishwasher water inlet valve assembly and the sealing port cannot be opened due to the seal being too tight; at the same time, at the moment of the continuous opening and closing action of the water inlet valve, impurities and scale products attached to the switch channel sealing end face of the water inlet valve assembly can fall into the water outlet pipe of the water inlet valve assembly by their own gravity under the impact of the inlet water flow and be discharged with the outlet water.

[0023] The dishwasher water inlet valve assembly of the present invention can effectively solve the problem that the sealing end face of the switch channel seal of the water inlet valve assembly cannot be opened due to tight sealing adhesion with the sealing port, or the valve seal is not tight due to the accumulation of impurities and scale products on the sealing end face. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 is a structural schematic diagram of a dishwasher water inlet valve assembly provided by Example 1 of the present invention;

[0025] Figure 2 1 is a schematic cross-sectional view of the specific structure of a dishwasher water inlet valve assembly provided by Example 2 of the present invention;

[0026] Figure 3 This is a flow chart of a control method for a dishwasher water inlet valve assembly provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0029] It should also be noted that the directional terms such as "upper", "lower", "one end" or "the other end" in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, or are based on the positions shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be considered as restrictive.

[0030] Example 1:

[0031] Embodiment 1 of the present invention provides a schematic structural diagram of a water inlet valve assembly, as shown in FIG. Figure 1 、 Figure 2 As shown, the dishwasher comprises an inlet valve 1, a sealing member 3, an inlet pipe 4, and an outlet pipe 5. The centerlines of the inlet pipe 4 and the outlet pipe 5 are arranged perpendicular to each other. The sealing member 3 is connected to the inlet valve 1 and is controlled by the inlet valve 1 for movement. The sealing member 3 is disposed at the connection between the inlet pipe 4 and the outlet pipe 5 and is located at the sealing opening provided at the connection between the inlet pipe 4 and the outlet pipe 5. The sealing member 3 is movable so that the sealing opening between the inlet pipe 4 and the outlet pipe 5 can be opened and closed at least twice within a short period of time when the dishwasher is started, thereby connecting the inlet pipe 4 and the outlet pipe 5 to enter the dishwasher's water filling process. Furthermore, the sealing member 3 has a sealing end face 31, which is parallel to the center line of the water inlet pipe 4 and perpendicular to the center line of the water outlet pipe 5; alternatively, the sealing end face 31 is inclined relative to the center lines of the water inlet pipe 4 and the water outlet pipe 5, and is inclined at an angle less than 60 degrees to the center line of the water inlet pipe 4; the water outlet pipe 5 is connected to the water inlet of the dishwasher 6.

[0032] When the dishwasher is started, the water inlet valve 1 opens, causing the seal 3 to move out of its sealing position. At this moment, the water flow from the water inlet pipe 4 generates a significant impact force. Because the sealing end face 31 of the seal 3 is parallel or angled with the centerline of the water inlet pipe 4, this impact force flushes impurities and scale deposits from the sealing end face 31 and the sealing opening, causing them to fall off. At the same time, since the water inlet pipe 4 and the water outlet pipe 5 are arranged perpendicularly, impurities and scale deposits from the sealing end face 31 and the sealing opening fall under the action of gravity into the water outlet pipe 5. Furthermore, under the control of the control system, the water inlet valve 1 drives the seal 3 to open and close rapidly multiple times in a short period of time at the sealing opening, utilizing the impact force of the water flow to repeatedly flush the sealing end face 31 and the sealing opening. Therefore, the water inlet valve assembly designed in the present invention can make the impurities and scale products on the sealing end face 31 of the seal 3 and the sealing port position fall into the water outlet pipe 5 of the water inlet valve assembly by their own gravity under the impact of the inlet water flow at the moment of continuous opening and closing, and be washed away by the water flow, thereby achieving the purpose of the present invention.

[0033] In the above structure, when the sealing end face 31 of the seal 3 is parallel to the center line of the water inlet pipe 4, the water inlet valve 1 is opened, and the moment the seal 3 moves, the water flow in the water inlet pipe 4 will generate a certain impact force at the moment the seal 3 leaves its sealing port position. At the same time, at the moment of movement, the seal 3 can also form a narrow channel between the sealing end face 31 and the sealing port (the channel diameter at this time is smaller than the diameter of the water inlet pipe 4), the water flow cross-section suddenly decreases, and the impact water flow pressure increases, thereby further increasing the water flow impact force, so that the cleaning effect of the sealing end face 31 and the sealing port position is better. When the sealing end face 31 of the sealing member 3 is tilted at an angle of less than 60 degrees relative to the center line of the water inlet pipe 4 (the tilt angle is preferably less than 45 degrees), the water inlet valve 1 is opened, and the moment the sealing member 3 moves, the water flow in the water inlet pipe 4 will generate a certain impact force at the moment the sealing member 3 leaves its sealing position. Since the sealing end face 31 is tilted at a certain angle to the center line of the water inlet pipe 4, the water flow is impacted when it hits the sealing end face 31, and this impact force can cause impurities and scale products on the sealing end face 31 to fall off. At the same time, the water flow splashes when it hits the sealing end face 31 due to the impact. Since the sealing end face 31 is arranged opposite to the sealing opening, the splashing water flow will further impact the sealing opening, which can also clean the sealing opening.

[0034] See also Figure 1 and Figure 2In a specific structural embodiment of the present invention, the water inlet valve 1 includes a transmission motor 11, a control unit 13, a valve body 14, and a valve stem 12 mating with the valve body 14. A connecting seat 2 is provided between the water inlet pipe 4 and the water outlet pipe 5. The connecting seat 2 is connectable to the valve body 14 and defines a cavity 21. A sealing port, a water inlet 23, and a water outlet 24 are provided within the cavity 21. The sealing port is located in the passage connecting the water inlet 23 and the water outlet 24. The centerlines of the water inlet 23 and the water outlet 24 are perpendicular to each other. The sealing member 3 is respectively connected to the water inlet pipe 4 and the water outlet pipe 5, such that the centerlines of the water inlet pipe 4 and the water outlet pipe 5 are perpendicular to each other. A sealing member 3 is disposed within the cavity 21. One end having a sealing end surface 31 is located at the sealing port, and the other end is connected to one end of the valve stem 12. The other end of the valve stem 12 is disposed within the valve body 14. The control unit 13 is electrically connected to the transmission motor 11 and drives the valve stem 12 to move via the transmission motor 11. During operation, the control unit 13 activates the transmission motor 11, moving the valve stem 12 and, simultaneously, the seal 3, opening or closing the sealing opening, thereby opening or closing the connection channel between the water inlet pipe 4 and the water outlet pipe 5. In the above structure, by providing a cavity 21 on the connecting base 2, the water inlet 23, water outlet 24, and sealing opening can be positioned within this cavity 21. This not only achieves an effective connection and vertical arrangement between the water inlet pipe 4 and the water outlet pipe 5, but also facilitates the connection between the valve stem 12 and the seal 3 and the processing of the sealing opening. Furthermore, the connecting base 2 facilitates the installation and fixation of the valve body 14, the water inlet pipe 4, and the water outlet pipe 5.

[0035] As a further structure of the above-mentioned connecting seat 2, the present invention also provides a retaining wall 25 in the cavity 21 of the connecting seat 2. The retaining wall 25 is a hollow boss extending upward from the bottom of the cavity 21, and has a fitting surface that can be opposite to the sealing end face 31 to form the aforementioned sealing opening. Driven by the valve stem 12 of the water inlet valve 1, the sealing end face 31 of the seal 3 is fitted with or separated from the surface at the sealing opening position. The sealing end face 31 is separated from or fitted with the fitting surface on the retaining wall 25, thereby completing the opening or closing of the connection channel between the water inlet pipe 4 and the water outlet pipe 5. The provision of the retaining wall 25 can reduce the processing requirements for the connecting seat 2 itself, and the plane accuracy of the fitting surface can be ensured by processing the fitting surface of the retaining wall 25 opposite to the sealing end face 31, thereby reliably ensuring the sealing effect of the seal 3 at the sealing opening position.

[0036] In order to achieve a better water flow impact effect, the fitting surface between the sealing opening and the sealing end surface 31 (or the fitting surface between the retaining wall 51 and the sealing end surface 31 ) is higher than the lowest point of the water inlet pipe 4 .

[0037] To further ensure the sealing effect, the sealing end face 31 of the sealing member 3 may also be provided with a sealing ring or a sealing gasket 31. The setting position of the sealing ring or the sealing gasket 31 corresponds to the position of the sealing port, which can not only play a better sealing role, but also facilitate replacement.

[0038] The present invention adopts the above structure, and the control unit 13 controls the transmission motor 11 to drive the valve stem 12 to move up and down, thereby driving the seal 3 to move. Figure 1 When the seal 3 moves upward, the sealing end face 31 moves away from the sealing opening, connecting the water inlet pipe 4 and the water outlet pipe 5. Water passes through the water inlet valve assembly and is discharged from the water outlet pipe 5 into the dishwasher 6. When the seal 3 moves downward, the sealing end face 31 of the seal 3 blocks the sealing opening, blocking the water outlet pipe 5 of the water inlet pipe 4. By controlling the up and down movement of the seal 3 to control the continuous opening and closing of the water inlet valve 1, it is possible to prevent the sealing end face 31 of the seal 3 of the water inlet valve assembly's switch channel from being too tightly bonded to the sealing opening, preventing it from opening. At the same time, during the continuous opening and closing of the water inlet valve 1, impurities and scale deposits adhering to the sealing end face 31 of the seal 3 of the water inlet valve assembly's switch channel fall into the water outlet pipe 5 under the impact of the inlet water flow and are then discharged with the outflowing water. Therefore, the water inlet valve assembly of the present invention can effectively solve the problem that the sealing end face 31 of the sealing member 3 of the water inlet valve assembly cannot be opened due to the tight sealing adhesion with the sealing port, or the valve seal is not tight due to the accumulation of impurities and scale products on the sealing end face 31.

[0039] Example 2

[0040] Embodiment 2 of the present invention provides a method for controlling a water inlet valve assembly of a dishwasher, such as Figure 3 As shown, the following steps are included:

[0041] S1. The frequency of use of the dishwasher per unit time is matched with the preset opening and closing times and opening and closing durations of the water inlet valve.

[0042] In this step, the frequency of using the dishwasher to wash dishes and other tableware can be set as needed. The unit time can be calculated on a weekly basis. For example, when X=7, it is washed every day, and when X=2, it is washed twice a week.

[0043] Since the frequency of use of the dishwasher is related to the accumulation of impurities and scale products, this step sets the corresponding opening and closing times and the corresponding opening time of the water inlet valve 1 by the frequency of use to ensure the cleaning effect.

[0044] In this step, the preset number of openings and closings of the water inlet valve 1 and the duration of openings and closings are inversely proportional to the frequency of dishwasher usage per unit time. If the dishwasher is used less frequently per week, the accumulation of impurities and scale products will increase accordingly, and the sealing end face 31 will remain in contact with the sealing opening for a longer period of time, requiring repeated flushing. Consequently, the number of openings and closings of the water inlet valve 1 and the duration of the sealing opening will also increase accordingly. If the dishwasher is used more frequently per week, the accumulation of impurities and scale products will decrease, requiring less water flow for repeated flushing, and the number of openings and closings of the water inlet valve 1 and the duration of the sealing opening will also decrease accordingly. This reduces water consumption and mitigates the impact of the instantaneous impact of the water flow on the water inlet valve 1 during its continuous opening and closing.

[0045] During specific settings, the preset opening time T1 of the water inlet valve 1 is greater than the closing time T2, that is, the time the sealing port is open is greater than the time the sealing port is closed. This can ensure the flushing time of the sealing end face 31 and the sealing port, and improve the flushing effect.

[0046] Furthermore, the preset opening time T1 of the water inlet valve 1 is: 1s≤T1≤3s, and the preset closing time T2 is: 0.5s≤T2≤2s.

[0047] As a specific implementation of this embodiment, the number of openings, opening duration T1, and the number of closings, closing duration T2 corresponding to the weekly usage frequency X can be seen in Table 1. The user only needs to select the usage frequency to obtain the corresponding number of openings, opening duration T1, and the number of closings, closing duration T2.

[0048] Table 1

[0049]

[0050] S2. Provide a manual interactive interface for the user to select. When the dishwasher is started, it prompts whether to start the "rinsing program". If "yes" is selected, it will enter the next program; if "no" is selected, it will directly enter the dishwasher water filling program;

[0051] When the dishwasher is started, the user can choose through the manual interaction interface whether to select the "rinsing program", rinse the sealing port first, and then execute the water filling program, or directly enter the dishwasher water filling program.

[0052] If "No" is selected: water inlet valve 1 activates, seal 3 leaves its sealing position, and water inlet pipe 4 connects to water outlet pipe 5. Water in water inlet pipe 4 flows into water outlet pipe 5 and then directly into the dishwasher through the dishwasher's water inlet 6, executing the water filling process. In other words, if the user selects "No," the dishwasher skips the continuous opening and closing of water inlet valve 1 to rinse seal 3 and the sealing opening and proceeds directly to the water filling process. Once water filling is complete, the dishwasher begins washing the dishes.

[0053] If you select "Yes", the flushing process will start.

[0054] S3. When the user selects "Yes", the control unit 13 starts the "flushing program" according to the user's instructions and prompts the user to set the usage frequency to automatically select the number of times the water inlet valve 1 is opened and closed and the opening and closing times.

[0055] S4. After the user completes the selection, the flushing process begins. The control unit 13 then drives the transmission motor 11 to move the valve stem 12 upward. Driven by the valve stem 12, the seal 3 leaves the sealing opening position. At the moment the sealing opening is opened, water from the water inlet pipe 4 rushes into the sealing end face 31 and the sealing opening along its centerline, flushing them for the set duration. After completion, the control unit 13 closes the water inlet valve 2, and the valve stem 12 moves downward. Driven by the valve stem 12, the seal 3 moves to the sealing opening position, closing the sealing opening and stopping the water flow. After the set closing duration is reached, the water inlet valve 1 is activated again, repeating the above process. In this way, the water inlet valve 1 operates according to the set number of times and opening and closing times, causing the seal 3 to move repeatedly within the set time, causing the sealing opening to open and close multiple times. The impactful water flow repeatedly cleans the sealing end face 31 and the sealing opening, causing impurities and scale deposits on the sealing end face 31 and the sealing opening to fall into the water outlet pipe 5.

[0056] S5: After rinsing is complete, water inlet valve 1 is opened again, and seal 3 moves upward again, leaving the sealing position, connecting water inlet pipe 4 with water outlet pipe 5. Water in water inlet pipe 4 flows into water outlet pipe 5 and then directly into dishwasher 6 through the water inlet of the dishwasher, executing the water filling process. After water filling is completed, the dishwasher begins to wash the dishes.

[0057] The water inlet valve assembly provided by the present invention can effectively solve the problem that the sealing end face 31 of the switch channel seal 3 of the water inlet valve assembly cannot be opened due to too tight sealing adhesion with the sealing port, or the valve seal is not tight due to the accumulation of impurities and scale products on the sealing end face 31.

[0058] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A water inlet valve assembly for a dishwasher, characterized by: The water inlet valve comprises a sealing member, a water inlet pipe and a water outlet pipe, wherein the center line of the water inlet pipe and the center line of the water outlet pipe are perpendicular to each other; the sealing member is located at a sealing port provided at the connection between the water inlet pipe and the water outlet pipe, and the sealing end surface of the sealing member is parallel to the water inlet pipe or inclined at an angle less than 60 degrees; The water inlet valve includes a valve body and a valve stem connected to the valve body; a connecting seat is provided at the connection between the water inlet pipe and the water outlet pipe, the connecting seat is provided with a cavity, a retaining wall is provided in the cavity, the retaining wall is a hollow boss extending upward from the bottom of the cavity, a fitting surface opposite to the sealing end surface is provided on the retaining wall to form the sealing port, and a water inlet connected to the water inlet pipe and a water outlet connected to the water outlet pipe are also provided in the cavity, and the center lines of the water inlet and the water outlet are perpendicular to each other; the sealing member is located in the cavity, one end with the sealing end surface is located at the sealing port position, and the other end is connected to one end of the valve stem, and the other end of the valve stem is placed in the valve body; The sealing member is controlled to move by the water inlet valve to open or close the sealing port between the water inlet pipe and the water outlet pipe; the water outlet pipe is connected to the water inlet of the dishwasher.

2. A water inlet valve assembly for a dishwasher according to claim 1, characterized in that: The fitting surface between the sealing opening and the sealing end surface is higher than the lowest point of the water inlet.

3. A water inlet valve assembly for a dishwasher according to claim 1 or 2, characterized in that: The sealing end surface of the sealing member is provided with a sealing ring or a sealing gasket.

4. A control method for the water inlet valve assembly according to any one of claims 1 to 3, characterized in that: The following steps are involved: The frequency of use of the dishwasher per unit time is matched to the preset number of opening and closing times and the opening and closing duration of the water inlet valve; Provides a manual interactive interface for users to choose. When the dishwasher is started, it prompts whether to start the "rinsing program". If you select "yes", it will enter the next program; if you select "no", it will directly enter the dishwasher water filling program; According to the user's instructions, prompt the user to set the usage frequency; Entering the flushing program, the valve stem of the water inlet valve drives the seal to leave the sealing port position under the control of the control unit. When the sealing port is just opened, the water flow of the water inlet pipe rushes into the sealing end face and the sealing port along its center line direction, and flushes them according to the time set by the user. After completion, the seal moves to the sealing port position under the action of the control unit, closes the sealing port, and the water flow stops. After the set closing time is reached, the water inlet valve is started again and the above process is repeated. The sealing port is continuously opened and closed according to the number of times and time set by the user, so that the water flow in the water inlet pipe flushes the seal; After the rinsing is completed, the control unit closes the water inlet valve, connects the water inlet pipe and the water outlet pipe, and enters the dishwasher water filling program.

5. The control method of the water inlet valve assembly according to claim 4, characterized in that: The preset number of times and duration of opening and closing of the water inlet valve are inversely proportional to the frequency of use of the dishwasher per unit time.

6. The control method of the water inlet valve assembly according to claim 4 or 5, characterized in that: The preset opening time length T1 of the water inlet valve is greater than the closing time length T2.

7. The control method of the water inlet valve assembly according to claim 6, characterized in that: The preset opening time T1 of the water inlet valve is: 1s≤T1≤3s, and the preset closing time T2 is: 0.5s≤T2≤2s.

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