Water softening system

Abstract

The utility model discloses a water softening system which belongs to the technical field of water softening equipment and comprises a resin tank, a salt box and a pipeline assembly, the pipeline assembly comprises a switching valve, a water inlet pipe, a water outlet pipe, a waste water pipe, a communicating pipe and a recycling pipe, the water inlet pipe, the water outlet pipe, the waste water pipe, the communicating pipe and the recycling pipe are connected with the switching valve, the switching valve is arranged at a top opening of the resin tank, and the communicating pipe is communicated with the salt box. A first switch valve is arranged on the wastewater pipe, one end of the recovery pipe is connected with the wastewater pipe and located on the upstream of the first switch valve, the other end of the recovery pipe is connected with the salt box, and a second switch valve is arranged on the recovery pipe. By adjusting the opening and closing states of the first switch valve and the second switch valve, regenerated waste liquid can be discharged and recycled, high-concentration saline water in the regeneration stage is recycled, the purpose of saving salt is achieved, and the regeneration cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of soft water equipment, in particular to a soft water system. Background Art

[0002] As people's living standards improve, water softening equipment has become widely used. Water softening equipment uses softening resins, which use their cations to absorb calcium and magnesium ions in the water, thereby softening the water. After a period of operation, the resin becomes saturated with calcium and magnesium ions, causing its ability to soften water to deteriorate or even cease. To ensure continuous water softening, the resin must be regularly regenerated.

[0003] Currently, water softening equipment commonly uses high-concentration sodium chloride (regeneration solution) to regenerate water softening resins. The salt absorption regeneration stage of the regeneration process is a critical step. During this stage, highly concentrated brine flows from the salt tank into the resin tank. The brine fully contacts the resin inside the tank, and the high-concentration sodium ions replace the calcium and magnesium ions on the resin, restoring the resin's activity. The wastewater from the salt absorption regeneration is discharged into the wastewater pipe. This wastewater contains unused high-concentration brine. Directly discharging it would waste salt and increase regeneration costs. Utility Model Content

[0004] The purpose of the utility model is to provide a soft water system to solve the technical problem in the prior art that the waste liquid of salt absorption and regeneration contains unused high-concentration salt water, which is directly discharged and causes salt waste.

[0005] As conceived above, the technical solution adopted by the utility model is:

[0006] A soft water system comprising:

[0007] a resin tank, wherein a water softening resin is arranged inside the resin tank;

[0008] salt box, used to hold salt;

[0009] The pipeline assembly includes a switching valve and an inlet pipe, an outlet pipe, a wastewater pipe, a connecting pipe and a recovery pipe connected to the switching valve. The switching valve is arranged at the top opening of the resin tank. The connecting pipe is connected to the salt tank. The wastewater pipe is provided with a first switching valve. One end of the recovery pipe is connected to the wastewater pipe and is located upstream of the first switching valve. The other end of the recovery pipe is connected to the salt tank. The recovery pipe is provided with a second switching valve.

[0010] Preferably, the pipeline assembly further includes a water distribution structure, which is disposed in the resin tank. The switching valve can be switched at different workstations so that the water distribution structure can distribute water from bottom to top or from top to bottom.

[0011] Preferably, the water distribution structure includes an upper water distributor and a central pipe, the upper water distributor is connected to the switching valve and is arranged around the circumference of the central pipe, and the central pipe is connected to the switching valve and extends from top to bottom in the resin tank.

[0012] Preferably, the water distribution structure further includes a lower water distributor, which is arranged at the lower end of the central pipe and communicated with the central pipe.

[0013] Preferably, the lower water distributor includes a water distribution main pipe and multiple water distribution branches. The water distribution main pipe is connected to the central pipe and the two extend coaxially. The multiple water distribution branches are distributed at circumferential intervals around the water distribution main pipe, and the water distribution branches are provided with multiple water distribution holes.

[0014] Preferably, the lower water distributor includes a water distribution main pipe and multiple water distribution branch pipes. The water distribution main pipe is connected to the central pipe and the two extend vertically. The multiple water distribution branch pipes are distributed on opposite sides of the water distribution main pipe. The water distribution branch pipes are provided with multiple water distribution holes.

[0015] Preferably, the switching valve is configured to selectively switch between the first workstation and the second workstation; when the switching valve is located at the first workstation, the connecting pipe is connected to the central pipe, and the upper water distributor is connected to the wastewater pipe; when the switching valve is located at the second workstation, the connecting pipe is connected to the upper water distributor, and the central pipe is connected to the wastewater pipe.

[0016] Preferably, the first switch valve and the second switch valve are both solenoid valves, and the soft water system further includes a control component, which is used to control the opening and closing of the first switch valve and the second switch valve; when the switching valve is located at the first working position, the first switch valve is in an open state and the second switch valve is in a closed state; when the switching valve is located at the second working position, the first switch valve is in a closed state and the second switch valve is in an open state.

[0017] Preferably, it further includes a filter and a drain pipe, wherein the filter is arranged on the recovery pipe and located upstream of the second switch valve, one end of the drain pipe is connected to the filter, and the other end of the drain pipe is connected to the wastewater pipe and located downstream of the first switch valve.

[0018] Preferably, the switching valve includes a valve body and a valve core arranged in the valve body, and valve ports are provided on the valve body corresponding to the water inlet pipe, the water outlet pipe, the waste water pipe, the connecting pipe and the water distribution structure.

[0019] Beneficial effects of the utility model:

[0020] The soft water system proposed in the present invention is characterized by providing a first on-off valve on the wastewater pipe, one end of the recovery pipe being connected to the wastewater pipe and located upstream of the first on-off valve, the other end of the recovery pipe being connected to the salt tank, and a second on-off valve being provided on the recovery pipe. During the regeneration phase, the first on-off valve can be opened and the second on-off valve closed, allowing the brine in the salt tank to flow from the connecting pipe into the resin tank, and the regeneration waste liquid in the resin tank to be discharged from the wastewater pipe through the first on-off valve. Alternatively, the first on-off valve can be closed and the second on-off valve opened, allowing the brine in the salt tank to flow from the connecting pipe into the resin tank, and the regeneration waste liquid in the resin tank to flow from the recovery pipe into the salt tank and then from the connecting pipe into the resin tank again for circulation. By adjusting the opening and closing states of the first on-off valve and the second on-off valve, the regeneration waste liquid can be discharged or recycled, thereby enabling the high-concentration brine in the regeneration phase to be recycled, achieving the purpose of saving salt and reducing regeneration costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the soft water system provided in Example 1 of the present utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the soft water system provided in Example 1 of the present utility model. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the soft water system provided in Example 1 of the present utility model. Figure 3 ;

[0024] Figure 4 This is a schematic diagram of the soft water system provided in Example 1 of the present utility model. Figure 4 ;

[0025] Figure 5 This is a structural diagram of a lower water distributor provided in Example 1 of the present utility model;

[0026] Figure 6 This is a structural diagram of another lower water distributor provided in Example 1 of the present utility model;

[0027] Figure 7 This is a schematic diagram of a water softening system provided in Example 2 of the present utility model;

[0028] Figure 8 It is a schematic diagram of a soft water system provided in Example 3 of the present utility model.

[0029] In the picture:

[0030] 10. Resin tank;

[0031] 20. Salt box;

[0032] 31. Switching valve; 311. First valve; 312. Second valve; 313. Third valve; 314. Fourth valve; 315. Fifth valve; 316. Sixth valve; 317. Seventh valve; 318. Eighth valve;

[0033] 32. Water inlet pipe; 33. Water outlet pipe; 34. Wastewater pipe; 35. Connecting pipe; 36. Recovery pipe;

[0034] 37. Water distribution structure; 371. Upper water distributor; 372. Central pipe; 373. Lower water distributor; 3731. Main water distribution pipe; 3732. Branch water distribution pipe;

[0035] 38. First switch valve; 39. Second switch valve;

[0036] 41. Filter; 42. Drain pipe. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0041] Example 1

[0042] See also Figures 1 to 4 An embodiment of the present invention provides a soft water system, including a resin tank 10, a salt box 20 and a pipeline assembly. The resin tank 10 is provided with a soft water resin; the salt box 20 is used to hold salt; the pipeline assembly is configured to inject water into the salt box 20 and can pass the regeneration solution in the salt box 20 into the resin tank 10.

[0043] A water softening system operates in both production and regeneration modes. In production mode, water flows through the softening resin, which absorbs calcium and magnesium ions in the water, reducing the hardness and producing soft water for consumption. In regeneration mode, a regeneration solution is introduced into the softening resin, displacing the calcium and magnesium ions and regenerating the resin. This allows the resin to absorb calcium and magnesium ions again, allowing the system to continue producing soft water.

[0044] The pipeline assembly includes a switching valve 31 and an inlet pipe 32, an outlet pipe 33, a wastewater pipe 34, a connecting pipe 35 and a recovery pipe 36 connected to the switching valve 31. The switching valve 31 is arranged at the top opening of the resin tank 10, the connecting pipe 35 is connected to the salt tank 20, a first switching valve 38 is provided on the wastewater pipe 34, one end of the recovery pipe 36 is connected to the wastewater pipe 34 and is located upstream of the first switching valve 38, the other end of the recovery pipe 36 is connected to the salt tank 20, and a second switching valve 39 is provided on the recovery pipe 36.

[0045] During the regeneration phase, the first on-off valve 38 can be opened and the second on-off valve 39 closed, allowing the brine in the brine tank 20 to flow from the connecting pipe 35 into the resin tank 10, while the regeneration waste liquid in the resin tank 10 is discharged from the wastewater pipe 34 through the first on-off valve 38. Alternatively, the first on-off valve 38 can be closed and the second on-off valve 39 opened, allowing the brine in the brine tank 20 to flow from the connecting pipe 35 into the resin tank 10, while the regeneration waste liquid in the resin tank 10 flows from the recovery pipe 36 into the brine tank 20 and then flows back into the resin tank 10 from the connecting pipe 35, thereby circulating. By adjusting the opening and closing states of the first on-off valve 38 and the second on-off valve 39, the regeneration waste liquid can be either discharged or recycled, allowing the high-concentration brine in the regeneration phase to be recycled, thereby saving salt and reducing regeneration costs.

[0046] Preferably, during the initial phase of the regeneration, first on-off valve 38 is opened and second on-off valve 39 is closed, allowing the regeneration waste liquid to be discharged from wastewater pipe 34. During the initial phase of the regeneration, the softening resin approaches saturation, and the saline concentration in the waste liquid is high. Therefore, first on-off valve 38 is closed and second on-off valve 39 is opened, allowing the regeneration waste liquid to be recycled. The opening and closing times of first on-off valve 38 and second on-off valve 39 can be adjusted according to actual needs.

[0047] In this embodiment, the pipeline assembly further includes a water distribution structure 37, which is disposed in the resin tank 10. The switching valve 31 can be switched at different positions so that the water distribution structure 37 can distribute water from bottom to top or from top to bottom. In the regeneration mode, countercurrent regeneration and downstream regeneration are performed in sequence. In the countercurrent regeneration, as shown in FIG. Figure 2 As shown, the first switch valve 38 is opened, the second switch valve 39 is closed, and the brine in the salt box 20 flows into the water distribution structure 37 from the connecting pipe 35. The water distribution structure 37 distributes water from bottom to top, and the regeneration waste liquid in the resin tank 10 is discharged from the waste water pipe 34. During downstream regeneration, as shown in FIG. Figure 3 As shown, first on-off valve 38 is closed and second on-off valve 39 is open. The brine in salt tank 20 flows from connecting pipe 35 into water distribution structure 37. Water distribution structure 37 distributes water from top to bottom. Regeneration wastewater in resin tank 10 flows from recovery pipe 36 into salt tank 20 and then from connecting pipe 35 back into water distribution structure 37 for circulation. By adjusting the opening and closing states of first on-off valve 38 and second on-off valve 39, the highly concentrated brine remaining at the bottom of resin tank 10 during countercurrent regeneration is recycled during the downstream regeneration phase, thereby conserving salt and reducing regeneration costs. Figure 2 and Figure 3 The arrows in the middle show the direction of water flow.

[0048] It can be that during the entire process of downstream regeneration, the first switch valve 38 is always in the closed state and the second switch valve 39 is always in the open state; it can also be that during the early period of downstream regeneration, the first switch valve 38 is closed and the second switch valve 39 is opened, so that the high-concentration brine remaining at the bottom of the resin tank 10 during the countercurrent regeneration is recycled in the downstream regeneration stage; during the middle period of downstream regeneration, such as Figure 4 As shown, the first switch valve 38 is open and the second switch valve 39 is closed, and the regeneration waste liquid is discharged from the waste water pipe 34; in the latter period of downstream regeneration, the first switch valve 38 is closed and the second switch valve 39 is opened, so that the high-concentration brine during downstream regeneration is recycled.

[0049] It can be that during the entire process of countercurrent regeneration, the first switch valve 38 is always open and the second switch valve 39 is closed; it can also be that in the early period of countercurrent regeneration, the first switch valve 38 is open and the second switch valve 39 is closed; in the latter period of countercurrent regeneration, the first switch valve 38 is closed and the second switch valve 39 is open, so that the regenerated waste liquid in the latter period of countercurrent regeneration flows from the recovery pipe 36 into the salt box 20 and flows into the water distribution structure 37 again from the connecting pipe 35 for circulation.

[0050] The water distribution structure 37 includes an upper water distributor 371 and a central tube 372. The upper water distributor 371 is connected to the switching valve 31 and is arranged circumferentially around the central tube 372. The central tube 372 is connected to the switching valve 31 and extends from top to bottom within the resin tank 10. The upper water distributor 371 and the central tube 372 cooperate to enable the water distribution structure 37 to distribute water from bottom to top or from top to bottom. In other embodiments, the water distribution structure 37 includes a first tube and a second tube, where the length of the first tube is shorter than the length of the second tube, so that the first tube can distribute water from top to bottom, and the second tube can distribute water from bottom to top.

[0051] During countercurrent regeneration, the brine in the salt tank 20 flows from the connecting pipe 35 into the central pipe 372, flows along the central pipe 372 to the bottom of the softening resin, passes through the softening resin from bottom to top, and regenerates the softening resin. The regeneration waste liquid flows from the upper water distributor 371 to the wastewater pipe 34 for discharge. During downstream regeneration, the brine in the salt tank 20 flows from the connecting pipe 35 into the upper water distributor 371, flows from the top of the softening resin, and passes through the softening resin from top to bottom, and regenerates the softening resin. The regeneration waste liquid flows from the central pipe 372 to the wastewater pipe 34 and then flows from the recovery pipe 36 into the salt tank 20. The brine in the salt tank 20 flows from the connecting pipe 35 again into the upper water distributor 371 to complete the circulation.

[0052] The water distribution structure 37 further includes a lower water distributor 373, which is disposed at the lower end of the central tube 372 and communicates with the central tube 372. By providing the lower water distributor 373, the water flowing out of the central tube 372 can fully contact the softening resin.

[0053] In some embodiments, as Figure 5 As shown, the lower water distributor 373 includes a main water distribution pipe 3731 and a plurality of branch water distribution pipes 3732. The main water distribution pipe 3731 is connected to the central pipe 372 and extends coaxially therewith. The plurality of branch water distribution pipes 3732 are spaced apart around the circumference of the main water distribution pipe 3731 and have a plurality of water distribution holes formed therein. The branch water distribution pipes 3732 can extend radially along the main water distribution pipe 3731.

[0054] The multiple water distribution holes on each water distribution branch pipe 3732 can have equal diameters, or the diameters of the multiple water distribution holes on each water distribution branch pipe 3732 can gradually increase in the direction away from the water distribution main pipe 3731 to increase the flow area so that the edge of the softened resin can also fully contact the regeneration solution.

[0055] In some embodiments, as Figure 6As shown, the lower water distributor 373 includes a main water distribution pipe 3731 and multiple branch water distribution pipes 3732. The main water distribution pipe 3731 is connected to the central pipe 372, and the two extend perpendicularly thereto. The multiple branch water distribution pipes 3732 are distributed on opposite sides of the main water distribution pipe 3731 and are provided with multiple water distribution holes. When the resin tank 10 is cylindrical, the length of the branch water distribution pipes 3732 gradually decreases from the center to the ends along the main water distribution pipe 3731. When the resin tank 10 is a rectangular parallelepiped, the lengths of the branch water distribution pipes 3732 can be equal.

[0056] The water distribution main pipe 3731 and the central pipe 372 can be threadedly connected to facilitate installation and removal. Specifically, a threaded hole is provided on the upper side of the water distribution main pipe 3731, and an external thread is provided on the lower end of the central pipe 372. During installation, the water distribution main pipe 3731 is inserted into the lower end of the central pipe 372 and the threads are tightened.

[0057] In this embodiment, the upper water distributor 371 can include a water distribution pan that is sleeved around the outer periphery of the central tube 372. The pan has a water inlet connected to the switching valve 31 and is provided with multiple water distribution holes. Specifically, the top of the pan is connected to the switching valve 31, and the water distribution holes can be provided at the bottom or outer periphery of the pan. In some embodiments, the outer periphery of the pan is inclined, with the water distribution holes provided on the inclined surface. This allows water to flow outward and downward from the water distribution holes, allowing the water to quickly and fully contact the water softening resin, thereby improving water distribution efficiency.

[0058] In some embodiments, both the first on-off valve 38 and the second on-off valve 39 are solenoid valves. The soft water system further includes a control component for controlling the opening and closing of the first on-off valve 38 and the second on-off valve 39. The control component may determine whether to perform regeneration based on the water quality at the water outlet. If regeneration is to be performed, the control component controls the opening and closing of the first on-off valve 38 and the second on-off valve 39 to sequentially perform reverse and forward regeneration.

[0059] The duration of the countercurrent regeneration and the duration of the downstream regeneration can be fixed values. Alternatively, whether to stop the regeneration can be determined based on the concentration of calcium ions and / or magnesium ions in the regeneration solution on the wastewater pipe 34 during the regeneration phase. Alternatively, the regeneration duration can be determined based on the volume of the softened resin and the flow rate of the regeneration solution. For example, the duration of the countercurrent regeneration T1 = L / (4V1 / πd 2 ), the duration of downstream regeneration T2=L / (4V2 / πd 2 ), L represents the height of the resin layer; V1 and V2 represent the flow rates of the countercurrent and cocurrent regeneration solutions; d represents the diameter of the resin tank 10.

[0060] Optionally, the outlet pipe 33 and the waste pipe 34 in the soft water system are both provided with concentration detection components for detecting the concentrations of calcium ions, magnesium ions and / or sodium ions to facilitate the start and stop control of each stage. Exemplarily, the concentration detection component can be a salinometer or a concentration sensor. Before the soft water system enters the regeneration mode, a certain amount of regeneration solution needs to be prepared. When the calcium ion concentration in the outlet pipe 33 rises to a first preset value, it indicates that the water softening ability of the soft water resin has decreased, but it can still meet the user's usage needs. At this time, the salt dissolving stage is entered, which can provide time for the salt to dissolve before entering the regeneration mode.

[0061] The soft water system also includes flushing modes, divided into forward flushing and backwashing. During the forward flushing phase, the water inlet pipe 32 is connected to the upper water distributor 371, and the central pipe 372 is connected to the wastewater pipe 34. Water entering the water inlet pipe 32 flushes the softening resin, and the wastewater generated by the flushing is discharged through the wastewater pipe 34. During the backwashing phase, the water inlet pipe 32 is connected to the central pipe 372, and the upper water distributor 371 is connected to the wastewater pipe 34.

[0062] The switching valve 31 is configured to selectively switch between the first station, the second station, the third station, the fourth station, the fifth station and the sixth station, so that the soft water system can meet the working requirements of the six stages of water production, water injection into the salt box 20, forward flushing, backwashing, downstream regeneration and countercurrent regeneration.

[0063] When the switching valve 31 is in the first position, the connecting pipe 35 is connected to the central pipe 372, and the upper water distributor 371 is connected to the wastewater pipe 34, causing the soft water system to enter the countercurrent regeneration phase. During the countercurrent regeneration phase, the regeneration solution in the salt tank 20 flows through the connecting pipe 35 into the central pipe 372 and is discharged from the bottom of the softening resin, flowing from bottom to top. After passing through the softening resin, the regeneration solution enters the wastewater pipe 34 through the upper water distributor 371. At this time, the first on-off valve 38 is opened, the second on-off valve 39 is closed, and the regeneration solution in the wastewater pipe 34 is discharged.

[0064] When the switching valve 31 is in the second position, the connecting pipe 35 is connected to the upper water distributor 371, and the central pipe 372 is connected to the wastewater pipe 34, allowing the softening water system to enter the downstream regeneration phase. During the downstream regeneration phase, the regeneration solution in the salt tank 20 enters the upper water distributor 371 through the connecting pipe 35 and is discharged from the top of the softening resin, so that the regeneration solution flows from top to bottom. After passing through the softening resin, the regeneration solution enters the wastewater pipe 34 through the central pipe 372. At this time, the second switching valve 39 is open and the first switching valve 38 is closed. The regeneration solution in the wastewater pipe 34 enters the salt tank 20 through the recovery pipe 36 and then enters the upper water distributor 371 through the connecting pipe 35, completing the circulation.

[0065] When the switching valve 31 is in the third position, the water inlet pipe 32 is connected to the upper water distributor 371, and the central pipe 372 is connected to the water outlet pipe 33, putting the water softening system into water production mode. In this mode, water enters the switching valve 31 through the water inlet pipe 32, passes through the switching valve 31 and enters the upper water distributor 371, where it passes through the softening resin from top to bottom and is softened. The softened water then flows through the central pipe 372 and into the water outlet pipe 33 for consumption.

[0066] When the switching valve 31 is in the fourth position, the water inlet pipe 32 is connected to the upper water distributor 371, and the central pipe 372 is connected to the wastewater pipe 34, causing the soft water system to enter the positive flushing phase. During the positive flushing phase, water enters the switching valve 31 through the water inlet pipe 32, passes through the switching valve 31, and enters the upper water distributor 371, flowing from top to bottom through the softening resin and flushing it. The water then flows through the central pipe 372 and into the wastewater pipe 34 for discharge.

[0067] When the switching valve 31 is in the fifth position, the water inlet pipe 32 is connected to the central pipe 372, and the upper water distributor 371 is connected to the wastewater pipe 34, causing the soft water system to enter the backwash phase. During the backwash phase, water enters the switching valve 31 through the water inlet pipe 32, then flows through the switching valve 31 into the central pipe 372, passing through the softening resin from bottom to top and flushing it. The water then flows through the upper water distributor 371 into the wastewater pipe 34 and is discharged.

[0068] When the switching valve 31 is in the sixth position, the water inlet pipe 32 connects to the connecting pipe 35 to inject water into the brine tank 20. Water enters the switching valve 31 through the water inlet pipe 32, passes through the switching valve 31, and enters the connecting pipe 35. By injecting water into the brine tank 20, the salt in the brine tank 20 dissolves and forms brine, i.e., the regeneration solution. Optionally, a liquid level detector is provided in the brine tank 20 to control the amount of water injected into the brine tank 20. Optionally, the liquid level detector can be a liquid level float switch.

[0069] To enable switching between the six workstations, the switching valve 31 in this embodiment is a six-position, six-way valve. The six valve ports of the switching valve 31 are respectively connected to the water inlet pipe 32, the water outlet pipe 33, the waste water pipe 34, the connecting pipe 35, the upper water distributor 371, and the central pipe 372. It should be noted that a six-position, six-way valve in the prior art can be used in this embodiment as long as it can meet the six workstations.

[0070] Exemplarily, the switching valve 31 includes a valve body and a valve core disposed within the valve body. The valve body is provided with valve ports corresponding to the water inlet pipe 32, water outlet pipe 33, wastewater pipe 34, connecting pipe 35, and water distribution structure 37. The water distribution structure 37 also has valve ports corresponding to the upper water distributor 371 and the center pipe 372. The valve core is rotatably disposed within the valve body and is provided with multiple connecting flow channels. When the valve core rotates, the connecting flow channels on the valve core connect the valve ports at the corresponding workstations.

[0071] Optionally, multiple valve ports are arranged in a circular shape, and two connecting flow channels are provided on the valve core. When the switching valve 31 is in the first position, one of the two connecting flow channels connects the corresponding valve port of the connecting pipe 35 with the corresponding valve port of the central pipe 372, and the other of the two connecting flow channels connects the corresponding valve port of the upper water distributor 371 with the corresponding valve port of the wastewater pipe 34. When the switching valve 31 is in the second position, one of the two connecting flow channels connects the corresponding valve port of the connecting pipe 35 with the corresponding valve port of the upper water distributor 371, and the other of the two connecting flow channels connects the corresponding valve port of the central pipe 372 with the corresponding valve port of the wastewater pipe 34. When the switching valve 31 is in the third position, one of the two connecting flow channels connects the corresponding valve port of the water inlet pipe 32 with the corresponding valve port of the upper water distributor 371, and the other of the two connecting flow channels connects the corresponding valve port of the central pipe 372 with the corresponding valve port of the water outlet pipe 33. When the switching valve 31 is in the fourth position, one of the two connecting flow channels connects the corresponding valve port of the water inlet pipe 32 with the corresponding valve port of the upper water distributor 371, and the other of the two connecting flow channels connects the corresponding valve port of the central pipe 372 with the corresponding valve port of the wastewater pipe 34. When the switching valve 31 is in the fifth position, one of the two connecting flow channels connects the corresponding valve port of the water inlet pipe 32 with the corresponding valve port of the central pipe 372, and the other of the two connecting flow channels connects the corresponding valve port of the upper water distributor 371 with the corresponding valve port of the wastewater pipe 34. When the switching valve 31 is in the sixth position, one of the two connecting flow channels connects the corresponding valve port of the water inlet pipe 32 with the corresponding valve port of the connecting pipe 35.

[0072] Optionally, when the connecting pipe 36 is connected to the upper water distributor 371, the water inlet pipe 32 is connected to the upper water distributor 371, thereby utilizing the suction force generated by the inflow of water into the water inlet pipe 32 to pass the regeneration solution in the resin tank 10 into the upper water distributor 371. When the connecting pipe 36 is connected to the central pipe 372, the water inlet pipe 32 is connected to the central pipe 372, thereby utilizing the suction force generated by the inflow of water into the water inlet pipe 32 to pass the regeneration solution in the resin tank 10 into the central pipe 372. Optionally, the flow of the regeneration solution is controlled by the suction force of a pump.

[0073] One or at least two resin tanks 10 can be provided. When at least two resin tanks 10 are provided, they can be connected in series or in parallel, and a pipeline assembly can flow regeneration solution into each resin tank 10 along a first direction and a second direction, respectively, to enhance the regeneration of the water softening resin within the resin tank 10. Furthermore, when at least two resin tanks 10 are connected in series, the soft water quality produced can be improved, thereby increasing the utilization rate of the regeneration solution. When at least two resin tanks 10 are connected in parallel, the soft water output can be increased, thereby enhancing the utilization rate of the water softening resin.

[0074] Example 2

[0075] Figure 7Embodiment 2 is shown, in which the parts that are the same as or corresponding to those in embodiment 1 are marked with the corresponding reference numerals in embodiment 1. For the sake of simplicity, only the differences between embodiment 2 and embodiment 1 are described. The difference is that the soft water system also includes a filter 41 and a drain pipe 42. The filter 41 is provided on the recovery pipe 36 and is located upstream of the second switch valve 39. One end of the drain pipe 42 is connected to the filter 41, and the other end of the drain pipe 42 is connected to the waste water pipe 34 and is located downstream of the first switch valve 38. By providing the filter 41, in the downstream regeneration stage, the regeneration solution flowing back into the salt tank 20 can be filtered to remove its own hardness ions, and the high-hardness waste liquid generated by the filtration is discharged through the waste water pipe 34. The filtered regeneration waste liquid flows through the salt tank 20 to the resin tank 10 to recycle the resin in the tank. Figure 7 The arrow in the middle shows the direction of water flow, which can make the resin regeneration more effective and can also achieve the purpose of saving salt. The internal structure of the filter 41 is not described in detail here, and an existing filter can be used.

[0076] Example 3

[0077] Figure 8 A third embodiment is shown, wherein components identical or corresponding to those in the first embodiment are denoted by the corresponding reference numerals. For simplicity, only the differences between the third embodiment and the first embodiment will be described. The difference lies in the switching valve 31 comprising multiple pipelines and valves, each equipped with an on / off control valve. The coordination of these multiple pipelines and valves satisfies the six operational requirements of water production, filling the brine tank 20, forward washing, backwashing, downstream regeneration, and reverse regeneration.

[0078] For example, Figure 8 The dashed box shows the internal structure of the switching valve 31. During countercurrent regeneration, the first valve 311 and the second valve 312 are open, while the remaining valves are closed. The connecting pipe 35 is connected to the central pipe 372, and the upper water distributor 371 is connected to the wastewater pipe 34. The first on-off valve 38 is open, and the second on-off valve 39 is closed. During forward regeneration, the third valve 313 and the fourth valve 314 are open, while the remaining valves are closed. The connecting pipe 35 is connected to the upper water distributor 371, and the central pipe 372 is connected to the wastewater pipe 34. The first on-off valve 38 is closed, and the second on-off valve 39 is open.

[0079] In water production mode, the fifth valve 315 and the sixth valve 316 are open, and the remaining valves are closed. The water inlet pipe 32 is connected to the upper water distributor 371, and the central pipe 372 is connected to the water outlet pipe 33. During the forward flushing phase, the fifth valve 315 and the fourth valve 314 are open, and the remaining valves are closed. The water inlet pipe 32 is connected to the upper water distributor 371, and the central pipe 372 is connected to the wastewater pipe 34. The first on-off valve 38 is open, and the second on-off valve 39 is closed. During the backwashing phase, the seventh valve 317 and the second valve 312 are open, and the remaining valves are closed. The water inlet pipe 32 is connected to the central pipe 372, and the upper water distributor 371 is connected to the wastewater pipe 34. The first on-off valve 38 is open, and the second on-off valve 39 is closed. When filling the brine tank 20 with water, the eighth valve 318 is open, and the remaining valves are closed. The water inlet pipe 32 is connected to the connecting pipe 35.

[0080] Each valve can be a solenoid valve, and the control component is used to control the opening and closing of each valve.

[0081] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft water system, characterized in that: include: A resin tank (10) having a water softening resin disposed therein; a salt box (20) for storing salt; A pipeline assembly comprises a switching valve (31) and a water inlet pipe (32), a water outlet pipe (33), a wastewater pipe (34), a connecting pipe (35) and a recovery pipe (36) connected to the switching valve (31), wherein the switching valve (31) is arranged at the top opening of the resin tank (10), the connecting pipe (35) is connected to the salt tank (20), a first switching valve (38) is arranged on the wastewater pipe (34), one end of the recovery pipe (36) is connected to the wastewater pipe (34) and is located upstream of the first switching valve (38), the other end of the recovery pipe (36) is connected to the salt tank (20), and a second switching valve (39) is arranged on the recovery pipe (36).

2. The soft water system according to claim 1, characterized in that The pipeline assembly further includes a water distribution structure (37), which is arranged in the resin tank (10). The switching valve (31) can be switched at different workstations so that the water distribution structure (37) can distribute water from bottom to top or from top to bottom.

3. The soft water system according to claim 2, characterized in that The water distribution structure (37) includes an upper water distributor (371) and a central pipe (372). The upper water distributor (371) is connected to the switching valve (31) and is arranged around the central pipe (372). The central pipe (372) is connected to the switching valve (31) and extends from top to bottom in the resin tank (10).

4. The soft water system according to claim 3, characterized in that The water distribution structure (37) further includes a lower water distributor (373), which is arranged at the lower end of the central pipe (372) and communicates with the central pipe (372).

5. The soft water system according to claim 4, characterized in that The lower water distributor (373) includes a water distribution main pipe (3731) and a plurality of water distribution branch pipes (3732). The water distribution main pipe (3731) is connected to the central pipe (372) and the two extend coaxially. The plurality of water distribution branch pipes (3732) are distributed at intervals around the circumference of the water distribution main pipe (3731). The water distribution branch pipes (3732) are provided with a plurality of water distribution holes.

6. The soft water system according to claim 4, characterized in that The lower water distributor (373) includes a main water distribution pipe (3731) and a plurality of branch water distribution pipes (3732). The main water distribution pipe (3731) is connected to the central pipe (372) and the two extend vertically. The plurality of branch water distribution pipes (3732) are distributed on opposite sides of the main water distribution pipe (3731). The branch water distribution pipes (3732) are provided with a plurality of water distribution holes.

7. The soft water system according to claim 3, characterized in that The switching valve (31) is configured to selectively switch between the first workstation and the second workstation; when the switching valve (31) is located at the first workstation, the connecting pipe (35) is connected to the central pipe (372), and the upper water distributor (371) is connected to the wastewater pipe (34); when the switching valve (31) is located at the second workstation, the connecting pipe (35) is connected to the upper water distributor (371), and the central pipe (372) is connected to the wastewater pipe (34).

8. The soft water system according to claim 7, characterized in that The first switch valve (38) and the second switch valve (39) are both solenoid valves, and the soft water system further comprises a control component, which is used to control the opening and closing of the first switch valve (38) and the second switch valve (39); When the switching valve (31) is located at the first working position, the first switch valve (38) is in an open state and the second switch valve (39) is in a closed state; When the switching valve (31) is located at the second working position, the first switch valve (38) is in a closed state and the second switch valve (39) is in an open state.

9. The soft water system according to claim 1, characterized in that The utility model further comprises a filter (41) and a drain pipe (42), wherein the filter (41) is arranged on the recovery pipe (36) and is located upstream of the second switch valve (39), one end of the drain pipe (42) is connected to the filter (41), and the other end of the drain pipe (42) is connected to the waste water pipe (34) and is located downstream of the first switch valve (38).

10. The soft water system according to any one of claims 1 to 9, characterized in that: The switching valve (31) comprises a valve body and a valve core arranged in the valve body, and the valve body is provided with valve ports corresponding to the water inlet pipe (32), the water outlet pipe (33), the waste water pipe (34) and the connecting pipe (35).

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