Valve and control method thereof, water filtering device and control method thereof

Abstract

The present invention discloses a valve and a control method thereof, a water filtering device and a control method thereof, which relate to the technical field of control valves, wherein the valve comprises: a housing, wherein a flow channel is provided in the housing; an isolating member capable of blocking the flow channel, wherein a back pressure cavity is formed between the side of the isolating member away from the flow channel and the housing, and a second opening is provided on the isolating member; a first opening connected to the back pressure cavity; a transmission member capable of driving the isolating member to move, wherein the transmission member can block the second opening; and the valve has at least three states: in the first state, the transmission member blocks the second opening, and the isolating member blocks the flow channel; in the second state, the second opening is in an open state, and the isolating member blocks the flow channel; in the third state, the transmission member drives the isolating member to separate from the flow channel. The present application can meet the demand for multiple flow rates at a low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to a valve and a control method thereof, a water filtering device and a control method thereof. Background Art

[0002] With the continuous upgrading of water purifier systems, in order to further improve the service life of the filter unit in the water purifier, the filtering effect and avoid the problem of TDS increase, it is necessary to set a valve with a wastewater ratio function at the wastewater end of the filter unit, and it is also necessary to be able to control the disconnection and opening of the wastewater end of the filter unit. Therefore, in the prior art, two solenoid valves are usually connected in parallel or in series to achieve the above three functions, or the two solenoid valves can be integrated into one valve. Although the latter method seems to use one valve on the surface, the internal principle of the valve is basically similar to the method of two solenoid valves connected in parallel or in series. For example, two independent coil mechanisms are required to achieve the above three functions.

[0003] Whether two solenoid valves are connected in parallel or in series or two solenoid valves are integrated into one valve, they all have disadvantages such as high cost and large size. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a valve and a control method thereof, a water filtering device and a control method thereof, which can meet the requirements for various flow rates at a low cost.

[0005] The specific technical solution of the embodiment of the present invention is:

[0006] A valve, comprising:

[0007] A housing, wherein the housing has a flow passage; an isolating member capable of blocking the flow passage, a back pressure cavity is formed between the housing and a side of the isolating member away from the flow passage, and a second opening is formed on the isolating member; a first opening connected to the back pressure cavity; a transmission member capable of driving the isolating member to move, and the transmission member can block the second opening;

[0008] The valve has at least three states: in the first state, the transmission member blocks the second opening, and the isolation member blocks the flow channel;

[0009] In the second state, the second opening is in an open state, and the isolation member blocks the flow channel opening;

[0010] In the third state, the transmission member drives the isolation member to separate from the flow channel opening.

[0011] Preferably, the shell has an inlet and an outlet, the first opening is connected to the inlet, and the second opening is connected to the outlet; the area of ​​the first opening is larger than the area of ​​the second opening.

[0012] Preferably, the first opening is located on the isolation member.

[0013] Preferably, the transmission member and the isolation member can slide relative to each other to have at least two positions. In the first position, the transmission member presses the second opening of the isolation member; in the second position, the transmission member disengages from the second opening of the isolation member, and the transmission member can drive the isolation member to move in a direction away from the flow channel outlet.

[0014] Preferably, the isolating member has a protrusion extending along the axial direction of the transmission member on a side away from the flow channel opening, and a slide groove is provided in the protrusion; the transmission member has a linkage portion, and the linkage portion is arranged in the slide groove and can move in the slide groove.

[0015] Preferably, the second opening is located below the linkage portion, and when the linkage portion moves toward the isolation member, the linkage portion can block the second opening.

[0016] Preferably, the linking portion has a force-bearing surface on a side facing away from the flow channel opening, and the force-bearing surface can be subjected to the pressure of the fluid in the back pressure chamber toward the isolation member.

[0017] Preferably, the transmission member is a core body made of ferromagnetic material, and the valve further comprises: a coil mechanism, and the coil mechanism is used to control the movement of the core body.

[0018] Preferably, when the coil mechanism is energized, the coil mechanism can drive the core to move in a direction away from the flow channel opening.

[0019] Preferably, when the coil mechanism is powered off, the valve is in a first state; and the transmission member and the isolation member are in a first position.

[0020] Preferably, when the coil mechanism is energized and the valve is in the second state, the force applied by the coil mechanism to drive the core body to move away from the flow channel opening is less than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member and the pressure of the fluid at the shell inlet acting on the isolation member.

[0021] Preferably, when the coil mechanism is energized and the valve is in the third state, the force exerted by the coil mechanism to drive the core body to move away from the flow channel outlet is greater than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member and the pressure of the fluid at the shell inlet acting on the isolation member.

[0022] Preferably, when the valve is in the second state, the coil mechanism is in an energized state, the transmission member and the isolation member are in a second position; and the inlet of the valve is connected to a pressurized fluid.

[0023] Preferably, when the valve is in the third state, the coil mechanism is in an energized state, the transmission member and the isolation member are in the second position, and the transmission member drives the isolation member to separate from the flow channel opening.

[0024] Preferably, a suction aid made of ferromagnetic material and fixed to the coil mechanism is provided above the core.

[0025] Preferably, a sealing diaphragm is provided on the isolation member, and the sealing diaphragm is used to abut against the flow channel opening.

[0026] Preferably, in the second state, the inlet of the shell is connected to the outlet of the shell through the first opening and the second opening.

[0027] Preferably, an annular groove is formed in the shell in the circumferential direction of the flow channel opening, and the annular groove is connected to the inlet of the shell. In the third state, the inlet of the shell is connected to the flow channel opening through the annular groove.

[0028] Preferably, when the coil mechanism is energized, the coil mechanism has at least two output powers. Under the first output power, the force of the coil mechanism driving the core body to move in the direction away from the flow channel opening is less than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member when the valve is in the second state and the pressure on the isolation member under the action of the fluid at the shell inlet; under the second output power, the force of the coil mechanism driving the core body to move in the direction away from the flow channel opening is greater than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member when the valve is in the second state and the pressure on the isolation member under the action of the fluid at the shell inlet.

[0029] A water filtering device comprises: a filtering unit; and a valve as described in any one of the above, wherein an inlet of the valve is connected to a wastewater outlet of the filtering unit.

[0030] Preferably, the water filtering device further comprises: a booster pump connected to the raw water inlet of the filtering unit.

[0031] A method for controlling a valve according to any one of the above, the method comprising:

[0032] When the valve needs to be closed, the back pressure chamber is pressurized, and the second opening is blocked by the transmission member, so that the valve enters the first state;

[0033] When the valve needs to be adjusted to a first preset flow rate, the flow channel opening is blocked by the isolation member, and the back pressure chamber is pressurized; after the back pressure chamber is pressurized, the transmission member is removed from the second opening, so that the valve enters the second state;

[0034] When the valve needs to be adjusted to the second preset flow rate, the isolation member is driven to separate from the flow channel opening by the transmission member, so that the valve enters the third state.

[0035] Preferably, the transmission member is a core body made of ferromagnetic material, and the valve further comprises: a coil mechanism, the coil mechanism being used to control the movement of the core body;

[0036] When the second opening is blocked by the transmission member, the coil mechanism is powered off;

[0037] When the transmission member is moved away from the second opening or the isolation member is driven to separate from the flow channel opening by the transmission member, the coil mechanism is energized.

[0038] Preferably, the first opening is connected to a pressurized water source to pressurize the back pressure chamber.

[0039] Preferably, the first preset flow rate is smaller than the second preset flow rate.

[0040] Preferably, when the valve needs to be switched from the first preset flow rate to the second preset flow rate, the pressure of the back pressure chamber is restored so that the transmission member drives the isolation member to separate from the flow channel opening;

[0041] When it is necessary to switch the valve from the second preset flow rate to the first preset flow rate, the pressure of the back pressure chamber is restored, the isolation member is used to block the flow channel opening, the transmission member is used to block the second opening, and then the back pressure chamber is pressurized; after the back pressure chamber is pressurized, the transmission member is removed from the second opening to allow the valve to enter the second state.

[0042] A control method for a water filtering device according to any one of the above, the control method comprising:

[0043] When the water filtering device is producing water, the flow channel opening is blocked by the isolating member, and the back pressure chamber is pressurized; after the back pressure chamber is pressurized, the transmission member is removed from the second opening, so that the valve enters the second state;

[0044] When the filter device needs to flush the filter unit, the isolation member is driven to separate from the flow channel opening by the transmission member, so that the valve enters the third state.

[0045] Preferably, the control method further comprises: when the filter device needs to disconnect the wastewater outlet of the filter unit, pressurizing the back pressure chamber and blocking the second opening with the transmission member to make the valve enter the first state.

[0046] Preferably, the water filtering device further comprises: a booster pump connected to the raw water inlet of the filtering unit;

[0047] When the filter device needs to flush the filter unit, the valve is first switched to the third state, and then the booster pump is turned on;

[0048] When the filtering device is producing water, the flow channel opening is blocked by the isolating member, and the booster pump is turned on; after the booster pump is turned on, the transmission member is moved away from the second opening, so that the valve enters the second state;

[0049] Preferably, when the filtering device needs to disconnect the wastewater outlet of the filtering unit, the booster pump is turned on to boost the pressure of the back pressure chamber.

[0050] Preferably, the transmission member is a core body made of ferromagnetic material, and the valve further comprises: a coil mechanism, the coil mechanism being used to control the movement of the core body;

[0051] When the filter device needs to flush the filter unit, the coil mechanism is energized so that the transmission member drives the isolation member to separate from the flow channel opening;

[0052] When the filtering device is producing water, after the booster pump is turned on, the coil mechanism is energized to move the transmission member away from the second opening;

[0053] Preferably, when the filter device needs to disconnect the wastewater outlet of the filter unit, the coil mechanism is powered off to allow the transmission member to block the second opening.

[0054] The technical solution of the present invention has the following significant beneficial effects:

[0055] Since the first preset amount and the second preset amount can be set to be different, the valve in the present application can meet the requirements of different fluid flow rates. At the same time, the valve can be switched or changed in different states only by controlling the pressure of the transmission member and the back pressure chamber. This can make the structure of the entire valve more streamlined and facilitate switching control, thereby greatly reducing the manufacturing cost of the valve.

[0056] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0058] Figure 1 is a cross-sectional view of a valve in an embodiment of the present invention;

[0059] Figure 2 It is a structural schematic diagram of a valve in a first state according to an embodiment of the present invention;

[0060] Figure 3 It is a structural schematic diagram of the valve in the second state according to an embodiment of the present invention;

[0061] Figure 4 Schematic diagram of the structure of the valve in the third state according to the embodiment of the present invention.

[0062] Reference numerals in the above drawings:

[0063] 1. Shell; 11. Inlet; 12. Outlet; 13. Annular groove; 2. Flow channel; 3. Isolation piece; 31. Second opening; 32. Protrusion; 33. Slide groove; 4. Back pressure chamber; 5. First opening; 6. Transmission piece; 61. Linkage part; 7. Coil mechanism; 8. Suction aid; 9. Sealing diaphragm. DETAILED DESCRIPTION

[0064] The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the communication between the two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0066] In order to meet the needs of various flow rates at a low cost, a valve is proposed in this application. Figure 1 is a cross-sectional view of a valve in an embodiment of the present invention, Figure 2 is a schematic structural diagram of a valve in a first state according to an embodiment of the present invention, Figure 3 is a schematic diagram of the structure of the valve in the second state according to an embodiment of the present invention, Figure 4 FIG. 1 is a schematic diagram of the structure of the valve in the third state according to an embodiment of the present invention. Figures 1 to 4As shown, the valve may include: a shell 1, with a flow opening 2 in the shell 1; an isolating member 3 capable of blocking the flow opening 2, a back pressure chamber 4 being formed between the side of the isolating member 3 facing away from the flow opening 2 and the shell 1, and a second opening 31 being provided on the isolating member 3; a first opening 5 communicating with the back pressure chamber 4; a transmission member 6 capable of driving the isolating member 3 to move, and the transmission member 6 can block the second opening 31; the valve has at least three states: in the first state, the transmission member 6 blocks the second opening 31, and the isolating member 3 blocks the flow opening 2; in the second state, the second opening 31 is in an open state, and the isolating member 3 blocks the flow opening 2; in the third state, the transmission member 6 drives the isolating member 3 to separate from the flow opening 2.

[0067] The control method of the valve in the embodiment of the present application can be as follows: when it is necessary to disconnect, Figure 2 As shown, the second opening 31 is blocked by the transmission member 6 to increase the pressure of the back pressure chamber 4. For example, the first opening 5 can be connected to a pressurized water source to increase the pressure of the back pressure chamber 4, so that the isolation member 3 blocks the flow channel 2 under the pressure of the back pressure chamber 4, so that the entire valve enters the first state, that is, the disconnected state. When the valve needs to be adjusted to the first preset amount, as shown in FIG. Figure 3 As shown, the flow channel 2 can be blocked by the isolation member 3, and the back pressure chamber 4 can be pressurized; after the back pressure chamber 4 is pressurized, the transmission member 6 is moved away from the second opening 31 to make the valve enter the second state. In the second state, the first opening 5 in the valve is connected to the second opening 31, and the fluid passing through the valve flows out through the first opening 5 and the second opening 31, thereby controlling the fluid flowing through the valve to be at the first preset amount in the above manner. When the valve needs to be adjusted to the second preset amount, as shown in FIG. Figure 4 As shown, the isolation member 3 is driven to separate from the flow channel 2 by the transmission member 6. At this time, the fluid flowing into the valve directly passes through the flow channel 2 to make the valve enter the third state. In this way, the fluid flowing through the valve is controlled at a second preset amount.

[0068] Generally speaking, the second preset flow rate of the fluid when the isolating member 3 is separated from the flow channel opening 2 in the third state of the valve is greater than the first preset flow rate of the fluid when the valve is in the second state. Of course, when the first opening 5 and the second opening 31 are relatively large, the gap formed by the isolating member 3 being separated from the flow channel opening 2 is very small, and the second preset flow rate of the fluid when the isolating member 3 is separated from the flow channel opening 2 in the third state of the valve may also be less than the first preset flow rate of the fluid when the valve is in the second state.

[0069] Since the first preset amount and the second preset amount can be set to be different, the valve can meet the requirements of different fluid flow rates. At the same time, the valve can be switched or changed in different states only by controlling the pressure of the transmission member 6 and the back pressure chamber 4. This can make the structure of the entire valve more streamlined and facilitate switching control, thereby greatly reducing the manufacturing cost of the valve.

[0070] In order to better understand the valve in this application, it will be further explained and illustrated below. Figure 1 As shown, the housing 1 of the valve may have an inlet 11 for fluid to flow in and an outlet 12 for fluid to flow out. A flow port 2 is formed inside the housing 1, and the flow port 2 can be connected with the inlet 11 of the housing 1 and the outlet 12 of the housing 1. An isolating member 3 that can block the flow port 2 is provided at the flow port 2, and the isolating member 3 can make the flow port 2 in an open or closed state. A back pressure chamber 4 is formed between the side of the isolating member 3 that is away from the flow port 2 and the housing 1, and a second opening 31 is provided on the isolating member 3, and the second opening 31 can be connected with the outlet 12 of the housing 1 and the back pressure chamber 4. The valve has a first state, and in the first state, the transmission member 6 blocks the second opening 31, and the isolating member 3 blocks the flow port 2.

[0071] In a possible implementation, Figures 1 to 4 As shown, a sealing membrane 9 may be provided on the isolating member 3, and the sealing membrane 9 is used to abut against the flow channel opening 2. The sealing membrane 9 may be provided at the edge of the isolating member 3, so that the sealing between the isolating member 3 and the flow channel opening 2 can be improved.

[0072] The valve has a first opening 5, which is connected to the back pressure chamber 4 and can be connected to the inlet 11 of the housing 1. When the isolating member 3 blocks the flow channel 2, the fluid passing through the valve can enter the back pressure chamber 4 through the first opening 5, and then flow out from the outlet 12 of the housing 1 through the second opening 31 of the back pressure chamber 4. The first opening 5 can be located on the isolating member 3, or in the housing 1.

[0073] In order to control the blocking of the flow channel opening 2 by the isolation member 3 through the pressure of the fluid entering the back pressure chamber 4, the area of ​​the first opening 5 is larger than the area of ​​the second opening 31. The amount of the fluid flowing into the back pressure chamber 4 through the first opening 5 is greater than or equal to the amount of the fluid flowing out of the back pressure chamber 4 through the second opening 31, so that the pressurized chamber is in a pressurized state, and the pressure of the fluid acting on the isolation member 3 can make the isolation member 3 block the flow channel opening 2.

[0074] The transmission member 6 in the valve has a certain linkage with the isolation member 3, which can drive the isolation member 3 to move, so that the transmission member 6 can block the second opening 31, and can also make the transmission member 6 detach from the second opening 31, and the second opening 31 is opened. In a feasible embodiment, Figures 1 to 4As shown, the transmission member 6 and the isolating member 3 can slide relative to each other to have at least two positions. In the first position, the transmission member 6 presses the second opening 31 of the isolating member 3; in the second position, the transmission member 6 is separated from the second opening 31 of the isolating member 3, and the transmission member 6 can drive the isolating member 3 to move away from the flow channel opening 2. For example, the isolating member 3 has a protrusion 32 extending along the axial direction of the transmission member 6 on the side away from the flow channel opening 2, and a slide groove 33 is provided in the protrusion 32; the transmission member 6 has a linkage portion 61, which is arranged in the slide groove 33 and can move in the slide groove 33. When the linkage part 61 moves in the slide groove 33 in the direction away from the isolation member 3, the transmission member 6 and the isolation member 3 are in the second position, and the transmission member 6 is disengaged from the second opening 31 of the isolation member 3; the second opening 31 is located below the linkage part 61, and when the linkage part 61 moves in the slide groove 33 in the direction of the isolation member 3, the transmission member 6 and the isolation member 3 are in the first position, and the linkage part 61 of the transmission member 6 blocks the second opening 31 of the isolation member 3.

[0075] like Figure 3 As shown, when the transmission member 6 and the isolation member 3 are in the second position, the transmission member 6 is separated from the second opening 31 of the isolation member 3, and the isolation member 3 blocks the flow channel 2, the valve is in the second state. When the valve is in the second state, the inlet 11 of the housing 1 is connected to the outlet 12 of the housing 1 through the first opening 5 and the second opening 31. The fluid flowing into the valve from the inlet 11 passes through the first opening 5, then flows through the second opening 31 on the isolation member 3, and finally flows out from the outlet 12 of the housing 1. Figure 1 As shown, when the transmission member 6 and the isolating member 3 are in the second position, the transmission member 6 is separated from the second opening 31 of the isolating member 3, and at the same time, when the transmission member 6 drives the isolating member 3 to separate from the flow channel opening 2, the valve is in the third state. An annular groove 13 may be formed in the housing 1 in the circumference of the flow channel opening 2, and the annular groove 13 is connected to the inlet 11 of the housing 1. When the valve is in the third state, the fluid flowing into the valve from the inlet 11 passes through the annular groove 13, then passes through the flow channel opening 2, and finally flows out from the outlet 12 of the housing 1.

[0076] like Figure 2 As shown, the side of the linkage part 61 facing away from the flow channel opening 2 may have a force-bearing surface, and the force-bearing surface can be subjected to the pressure of the fluid in the back pressure chamber 4 toward the isolation member 3, so that the linkage part 61 of the transmission member 6 keeps blocking the second opening 31 of the isolation member 3, thereby keeping the valve in the first state.

[0077] In a feasible implementation, the transmission member 6 can be a core body made of ferromagnetic material, and the valve further includes: a coil mechanism 7, which is used to control the movement of the core body. Specifically, the coil mechanism 7 is sleeved outside the core body, and when the transmission member 6 is removed from the second opening 31 or the isolation member 3 is driven to separate from the flow channel opening 2 by the transmission member 6, the coil mechanism 7 is energized. Figure 3 to Figure 4 As shown, when the coil mechanism 7 is energized, the coil mechanism 7 can drive the core body to move in the direction away from the flow channel opening 2. At this time, the valve may be in the second state or the third state. When the valve is in the second state, the transmission member 6 and the isolation member 3 are in the second position. Since the second opening 31 is in the open state, the isolation member 3 blocks the flow channel opening 2, and the inlet 11 of the valve is connected to the pressurized fluid, so that the fluid flowing into the back pressure chamber 4 makes the back pressure chamber 4 in a pressurized state. The pressure of the fluid acting on the isolation member 3 is relatively large, which can cause the isolation member 3 to block the flow channel opening 2. The force of the coil mechanism 7 driving the core body to move in the direction away from the flow channel opening 2 is smaller than the difference between the pressure of the fluid in the back pressure chamber 4 acting on the isolation member 3 and the pressure of the fluid at the inlet 11 of the shell 1 acting on the isolation member 3, and the isolation member 3 cannot move upward driven by the core body. Figure 4 As shown, when the valve is in the third state, the transmission member 6 and the isolation member 3 are in the second position. Since the second opening 31 is in the open state, the transmission member 6 drives the isolation member 3 to separate from the flow port 2, and the fluid flowing into the valve body directly flows out through the flow port 2. The back pressure chamber 4 is not in a pressurized state, and the downward pressure of the fluid in the back pressure chamber 4 on the isolation member 3 is small or almost non-existent. The force of the coil mechanism 7 driving the core body upward is greater than the difference between the pressure of the fluid in the back pressure chamber 4 acting on the isolation member 3 and the pressure of the fluid at the inlet 11 of the shell 1 acting on the isolation member 3. Therefore, the isolation member 3 is kept in the second position driven by the core body, and the isolation member 3 always remains separated from the flow port 2.

[0078] like Figure 2 As shown, when the second opening 31 is blocked by the transmission member 6, the coil mechanism 7 is powered off. When the coil mechanism 7 is powered off, the valve is in the first state, i.e., the disconnected state, and the transmission member 6 and the isolation member 3 are in the first position, i.e., the transmission member 6 presses the second opening 31 of the isolation member 3.

[0079] When the valve needs to be switched from the first preset flow rate to the second preset flow rate, the pressure of the back pressure chamber 4 is restored so that the transmission member 6 drives the isolation member 3 to separate from the flow channel opening 2. Specifically, when the valve is at the first preset flow rate, the coil mechanism 7 is in an energized state. When switching is required, the valve inlet 11 is disconnected from the pressurized water source or the pressure of the water source is reduced, thereby restoring and reducing the pressure of the back pressure chamber 4. In this way, the coil mechanism 7 can drive the core body to move upward to separate the isolation member 3 from the flow channel opening 2, and then the valve inlet 11 is connected to the pressurized water source or the water source pressure is increased to ensure that water flows through the valve, and then the valve is at the second preset flow rate.

[0080] When it is necessary to switch the valve from the second preset flow rate to the first preset flow rate, the pressure of the back pressure chamber 4 is restored, the isolating member 3 is used to block the flow channel 2, the transmission member 6 is used to block the second opening 31, and then the back pressure chamber 4 is pressurized; after the back pressure chamber 4 is pressurized, the transmission member 6 is removed from the second opening 31 to allow the valve to enter the second state. Specifically, when the valve is at the first preset flow rate, the coil mechanism 7 is in an energized state, and the isolating member 3 is separated from the flow channel 2. When switching is required, the valve inlet 11 is disconnected from the pressurized water source or the pressure of the water source is reduced, thereby restoring and reducing the pressure of the back pressure chamber 4, and the coil mechanism 7 is powered off, so that the isolating member 3 blocks the flow channel 2 and the transmission member 6 blocks the second opening 31. Then connect the valve inlet 11 to a pressurized water source or increase the water source pressure to ensure that water flows through the valve, thereby pressurizing the back pressure chamber 4; after the back pressure chamber 4 is pressurized, energize the coil mechanism 7, and the coil mechanism 7 drives the transmission member 6 to move away from the second opening 31, so that the valve enters the second state.

[0081] In a feasible implementation, when the coil mechanism 7 is energized, the coil mechanism 7 has at least two output powers. Under the first output power, the force of the coil mechanism 7 driving the core body to move in the direction away from the flow channel opening 2 is less than the difference between the pressure of the fluid in the back pressure chamber 4 acting on the isolation member 3 when the valve is in the second state and the pressure on the isolation member 3 under the action of the fluid at the inlet 11 of the shell 1. At this time, the coil mechanism 7 can drive the core body to move in the direction away from the flow channel opening 2 to the second position between the transmission member 6 and the isolation member 3. At the same time, the isolation member 3 blocks the flow channel opening 2, thereby placing the valve in the second state. Under the second output power, the force of the coil mechanism 7 driving the core body to move in the direction away from the flow channel opening 2 is greater than the difference between the pressure of the fluid in the back pressure chamber 4 acting on the isolation member 3 when the valve is in the second state and the pressure on the isolation member 3 under the action of the fluid at the inlet 11 of the shell 1. At this time, the coil mechanism 7 can drive the core body to move away from the flow channel opening 2 to the second position between the transmission member 6 and the isolation member 3. At the same time, the transmission member 6 drives the isolation member 3 to separate from the flow channel opening 2, thereby placing the valve in the third state.

[0082] In a feasible implementation mode, as Figures 1 to 4 As shown, in order to increase the force acting on the core body to move upward when the coil mechanism 7 is powered on, an auxiliary suction member 8 made of ferromagnetic material is provided above the core body and fixed to the coil mechanism 7. In the above manner, the size of the coil mechanism 7 or the current passed through the coil mechanism 7 can be reduced while generating the same force.

[0083] A water filtering device is also proposed in the present application, and the water filtering device includes: a filtering unit; a valve such as any of the above, wherein the inlet 11 of the valve is connected to the wastewater outlet of the filtering unit. The valve can realize a closing function, a wastewater ratio function and an opening function under a large flow rate at the wastewater outlet of the filtering unit. Under the opening function of a large flow rate, the valve is in a third state, at which the water filtering device can flush the filtering unit, and during flushing, the flushed water is directly discharged from the wastewater outlet. When the valve realizes the wastewater ratio function at the wastewater outlet of the filtering unit, the valve is in a second state. When the valve realizes a closing function at the wastewater outlet of the filtering unit, the valve is in a first state.

[0084] The control method of the above-mentioned water filtering device may include the following steps: when the water filtering device is making water, the flow channel 2 is blocked by the isolating member 3, and the booster pump is turned on to boost the back pressure chamber 4; after the back pressure chamber 4 is boosted, the coil mechanism 7 is energized to move the transmission member 6 away from the second opening 31, so that the valve enters the second state. When the filter device needs to flush the filter unit, the isolating member 3 is driven to separate from the flow channel 2 by the transmission member 6, so that the valve enters the third state, and then the booster pump is turned on to drive the fluid to enter the filter unit for flushing, and the flushed fluid is discharged from the valve through the waste water outlet of the filter unit. When the filter device needs to disconnect the waste water outlet of the filter unit, the booster pump is turned on to boost the back pressure chamber 4, and the coil mechanism 7 is powered off, and the transmission member 6 blocks the second opening 31, so that the valve enters the first state. In addition, the valve in the present application can also be installed in other household appliances, especially appliances that require two different flow requirements for the fluid (water flow) introduced. For example, a washing machine can use two different flow rates when it is filled with water. When the valve is in the second state, the washing machine has a small amount of water inflow, and this part of water needs to flow through the box storing the laundry detergent to flush the laundry detergent into the drum. After that, the valve is in the third state, the washing machine has a large amount of water inflow, and the water directly flows into the drum at a large flow rate. When the water in the drum reaches a certain level, the valve is in the first state, that is, the closed state.

[0085] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0086] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A valve, characterized in that: The valve comprises: A housing, wherein the housing has a flow passage; an isolating member capable of blocking the flow passage, a back pressure cavity is formed between the housing and a side of the isolating member away from the flow passage, and a second opening is formed on the isolating member; a first opening connected to the back pressure cavity; a transmission member capable of driving the isolating member to move, and the transmission member can block the second opening; The first opening is located on the isolation member; the housing has an inlet and an outlet, the first opening is connected to the inlet, and the second opening is connected to the outlet; the area of ​​the first opening is larger than the area of ​​the second opening; The valve has at least three states: in the first state, the transmission member blocks the second opening, and the isolation member blocks the flow channel; In the second state, the second opening is in an open state, and the isolation member blocks the flow channel opening; In the third state, the transmission member drives the isolation member to separate from the flow channel opening.

2. The valve according to claim 1, characterized in that: The transmission member and the isolation member are capable of relative sliding to each other so as to have at least two positions. In a first position, the transmission member presses the second opening of the isolation member. In the second position, the transmission member is separated from the second opening of the isolation member, and the transmission member can drive the isolation member to move in a direction away from the flow channel opening.

3. The valve according to claim 2, characterized in that: The isolating member has a protrusion extending along the axial direction of the transmission member on a side away from the flow channel opening, and a slide groove is provided in the protrusion; the transmission member has a linkage portion, and the linkage portion is arranged in the slide groove and can move in the slide groove.

4. The valve according to claim 3, characterized in that: The second opening is located below the linkage portion, and when the linkage portion moves toward the isolation member, the linkage portion can block the second opening.

5. The valve according to claim 3, characterized in that: The linking portion has a force-bearing surface on a side facing away from the flow channel opening, and the force-bearing surface can be subjected to the pressure of the fluid in the back pressure chamber toward the isolation member.

6. The valve according to claim 2, characterized in that: The transmission member is a core body made of ferromagnetic material, and the valve further comprises: a coil mechanism, and the coil mechanism is used to control the movement of the core body.

7. The valve according to claim 6, characterized in that When the coil mechanism is energized, the coil mechanism can drive the core to move in a direction away from the flow channel opening.

8. The valve according to claim 6, characterized in that When the coil mechanism is powered off, the valve is in a first state; the transmission member and the isolation member are in a first position.

9. The valve according to claim 6, characterized in that When the coil mechanism is energized, when the valve is in the second state, the force applied by the coil mechanism to drive the core body to move away from the flow channel opening is smaller than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member and the pressure of the fluid at the shell inlet acting on the isolation member.

10. The valve according to claim 6, characterized in that When the coil mechanism is energized and the valve is in the third state, the force applied by the coil mechanism to drive the core body to move away from the flow channel opening is greater than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member and the pressure of the fluid at the shell inlet acting on the isolation member.

11. The valve according to claim 9, characterized in that When the valve is in the second state, the coil mechanism is in an energized state, the transmission member and the isolation member are in a second position; and the inlet of the valve is connected to the pressurized fluid.

12. The valve according to claim 9, characterized in that When the valve is in the third state, the coil mechanism is in an energized state, the transmission member and the isolation member are in the second position, and the transmission member drives the isolation member to separate from the flow channel opening.

13. The valve according to claim 6, characterized in that A suction-assisting component made of ferromagnetic material and fixed to the coil mechanism is arranged above the core body.

14. The valve according to claim 1, characterized in that The isolating member is provided with a sealing diaphragm, and the sealing diaphragm is used to abut against the flow channel opening.

15. The valve according to claim 1, characterized in that In the second state, the inlet of the shell is connected to the outlet of the shell through the first opening and the second opening.

16. The valve according to claim 1, characterized in that An annular groove is formed in the shell in the circumferential direction of the flow channel opening, and the annular groove is connected to the inlet of the shell. In the third state, the inlet of the shell is connected to the flow channel opening through the annular groove.

17. The valve according to claim 6, characterized in that When the coil mechanism is powered on, the coil mechanism has at least two output powers. Under the first output power, the force of the coil mechanism driving the core body to move away from the flow channel opening is less than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member and the pressure of the fluid at the shell inlet acting on the isolation member when the valve is in the second state; At the second output power, the force exerted by the coil mechanism to drive the core body to move away from the flow channel opening is greater than the difference between the pressure of the fluid in the back pressure chamber acting on the isolation member when the valve is in the second state and the pressure on the isolation member under the action of the fluid at the shell inlet.

18. A water filtering device, characterized in that: The water filtering device comprises: a filtering unit; and a valve as described in any one of claims 1 to 17, wherein the inlet of the valve is connected to the wastewater outlet of the filtering unit.

19. The water filtering device according to claim 18, characterized in that: The water filtering device also includes: a booster pump connected to the raw water inlet of the filtering unit.

20. A method for controlling a valve according to any one of claims 1 to 17, characterized in that: The control method comprises: When the valve needs to be closed, the back pressure chamber is pressurized, and the second opening is blocked by the transmission member, so that the valve enters the first state; When the valve needs to be adjusted to a first preset flow rate, the flow channel opening is blocked by the isolation member, and the back pressure chamber is pressurized; after the back pressure chamber is pressurized, the transmission member is removed from the second opening, so that the valve enters the second state; When the valve needs to be adjusted to the second preset flow rate, the isolation member is driven to separate from the flow channel opening by the transmission member, so that the valve enters the third state.

21. The control method according to claim 20, characterized in that: The transmission member is a core body made of ferromagnetic material, and the valve further comprises: a coil mechanism, the coil mechanism is used to control the movement of the core body; When the second opening is blocked by the transmission member, the coil mechanism is powered off; When the transmission member is moved away from the second opening or the isolation member is driven to separate from the flow channel opening by the transmission member, the coil mechanism is energized.

22. The control method according to claim 20, characterized in that: The first opening is connected to a pressurized water source to increase the pressure of the back pressure chamber.

23. The control method according to claim 20, characterized in that: The first preset flow rate is smaller than the second preset flow rate.

24. The control method according to claim 20, characterized in that: When the valve needs to be switched from the first preset flow rate to the second preset flow rate, the pressure of the back pressure chamber is restored so that the transmission member drives the isolation member to separate from the flow channel opening; When the valve needs to be switched from the second preset flow rate to the first preset flow rate, the pressure of the back pressure chamber is restored, the isolation member is used to block the flow channel opening, the transmission member is used to block the second opening, and then the back pressure chamber is pressurized; After the back pressure chamber is pressurized, the transmission member is moved away from the second opening to allow the valve to enter the second state.

25. A control method for a water filtering device according to any one of claims 18 to 19, characterized in that: The control method comprises: When the water filtering device is producing water, the flow channel is blocked by the isolation member, and the back pressure chamber is pressurized; after the back pressure chamber is pressurized, the transmission member is moved away from the second opening, so that the valve enters the second state; When the filter device needs to flush the filter unit, the isolation member is driven to separate from the flow channel opening by the transmission member, so that the valve enters the third state.

26. The control method of the water filtering device according to claim 25, characterized in that: The control method further includes: when the filter device needs to disconnect the wastewater outlet of the filter unit, pressurizing the back pressure chamber and blocking the second opening with the transmission member to make the valve enter the first state.

27. The control method of the water filtering device according to claim 26, characterized in that: The water filtering device further comprises: a booster pump connected to the raw water inlet of the filtering unit; When the filter device needs to flush the filter unit, the valve is first switched to the third state, and then the booster pump is turned on; When the filtering device is producing water, the flow channel opening is blocked by the isolating member, and the booster pump is turned on; after the booster pump is turned on, the transmission member is moved away from the second opening, so that the valve enters the second state; When the filter device needs to disconnect the wastewater outlet of the filter unit, the booster pump is turned on to increase the pressure of the back pressure chamber.

28. The control method of the water filtering device according to claim 26, characterized in that: The transmission member is a core body made of ferromagnetic material, and the valve further comprises: a coil mechanism, the coil mechanism is used to control the movement of the core body; When the filter device needs to flush the filter unit, the coil mechanism is energized so that the transmission member drives the isolation member to separate from the flow channel opening; When the filtering device is producing water, after the booster pump is turned on, the coil mechanism is energized to move the transmission member away from the second opening; When the filter device needs to disconnect the wastewater outlet of the filter unit, the coil mechanism is powered off to allow the transmission member to block the second opening.

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