Multifunctional small water softener and working method thereof

Abstract

The invention relates to the technical field of water treatment equipment, in particular to a multifunctional small water softener and a working method thereof.The multifunctional small water softener comprises a salt box, a switching valve and a softening and filtering device which are sequentially arranged in the vertical direction; the switching valve is provided with a raw water inlet, a softened water outlet and a drain outlet; a fluid passage is formed in the switching valve, a flow path switching piece is arranged in the switching valve, and the flow path switching piece can be operated to change the connection state of the fluid passage. Two modes of softening and regeneration are set, during regeneration, saline water enters from the bottom of the softening and filtering device and flows through resin from bottom to top, the reverse flow mode is consistent with the water flow direction during softening, the regeneration efficiency is higher, the consumption of salt and water can be remarkably reduced, and the water is dissolved in the process of passing through the salt; meanwhile, salt water enters the resin to be regenerated, so that the salt does not need to be dissolved in advance, a large salt box is not needed, and the product can be made to be very small and is suitable for being used in narrow toilets.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment equipment, in particular to a multifunctional small softener and a working method thereof. BACKGROUND

[0002] The softener is a device for removing hardness ions such as calcium and magnesium in water through ion exchange principle. When the resin is saturated, the device needs to switch to regeneration mode to regenerate the resin by flushing with brine taken from the salt tank, so as to restore its softening capacity.

[0003] At present, in order to adapt the softener to the limited space of small and medium-sized residential houses, realizing the miniaturization and compactness of the whole device has become one of the core research and development directions in the industry. The general technical path in the industry is to optimize the structure of each independent functional module. The existing technology mainly realizes the reduction of the volume of the valve body by optimizing the spatial layout of the internal parts of the valve. For example, in the Chinese invention patent with the patent name of "soft water valve and soft water device" and the announcement number of CN118049506A, the ratio (0.7-0.9) of the diameter of the rotatable dynamic disc to the inner diameter of the valve seat installation chamber is accurately designed, so that the internal space of the valve is maximized under the premise of meeting the water flow, thereby effectively reducing the overall volume of the soft water valve.

[0004] However, the above-mentioned existing technical solutions mostly focus on the independent optimization of a single module (such as a valve, a salt tank), and fail to fundamentally innovate from the aspect of the overall system architecture of the softener. The traditional softener usually adopts the mode of horizontal parallel arrangement of each module or connection through complex external pipelines. This kind of dispersed layout is the main reason for the large floor area of the device, the long pipeline, the numerous interfaces and the complex assembly.

[0005] Even if the volume of a single valve body is reduced, the inherent separated relationship among the salt tank, the valve body and the resin tank is not changed, and the physical space and the pipeline required for connection are not reduced, so there is an obvious bottleneck in the reduction of the overall volume of the device.

[0006] Therefore, how to break through the traditional module stacking idea, fundamentally reconstruct the spatial position and connection relationship among the salt tank, the control valve and the softening and filtering device through an innovative integrated structure design, and achieve the ultimate overall compactness, is still a technical problem that needs to be solved by the technical personnel in the field. SUMMARY

[0007] Technical problem to be solved In view of the above-mentioned shortcomings of the prior art, the present application provides a multifunctional small softener and a working method thereof, which can solve the problems of large size of the softener in the prior art and complicated equipment.

[0008] Technical scheme

[0009] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a multifunctional small water softener, including a brine tank, a switching valve, and a softening filter device, which are arranged vertically in sequence. The switching valve has a raw water inlet, a softened water outlet, and a drain outlet. A fluid passage is formed within the switching valve, and a flow path switching component is provided. The flow path switching component can be operated to change the connection state of the fluid passage, thereby enabling the water softener to have a first working state and a second working state. In the first working state, the raw water inlet is connected to the inlet of the softening filter device via the fluid passage, and the outlet of the softening filter device is connected to the softened water outlet via the fluid passage. In the second working state, the raw water inlet is connected to the inlet of the brine tank via the fluid passage, the outlet of the brine tank is connected to the inlet of the softening filter device via the fluid passage, and the outlet of the softening filter device is connected to the drain outlet via the fluid passage.

[0010] Furthermore, the salt tank, switching valve, and softening filter are arranged coaxially.

[0011] Furthermore, the flow path switching component is a valve disc rotatably disposed within the switching valve. The switching valve has a fixed water flow channel. By rotating the valve disc, the alignment between the through hole on the valve disc and the fixed water flow channel is adjusted, thereby realizing the switching between the first working state and the second working state.

[0012] Furthermore, the softening filtration device includes a housing, a resin filter element coaxially disposed within the housing, and an ion exchange resin filled within the resin filter element. An annular space is formed between the outer wall of the resin filter element and the inner wall of the housing. The bottom of the resin filter element is provided with a through hole, and the top is provided with an opening. In the first working state, the through hole of the valve disc connects the raw water inlet with the top opening of the resin filter element, and connects the lower part of the annular space with the softened water outlet. In the second working state, the through hole of the valve disc connects the outlet of the salt tank to the lower part of the annular space, and connects the top opening of the resin filter element to the drain port.

[0013] Furthermore, the salt tank is provided with a flow-limiting unit for reducing and / or limiting the flow rate of water flowing into it.

[0014] Furthermore, the flow limiting unit is a pressure reducing valve installed inside the salt tank, and the pressure reducing valve has several fine holes distributed inside.

[0015] Furthermore, the salt tank is provided with a vertical hollow tube, and the flow limiting unit is installed at the top of the hollow tube.

[0016] Further, the bottom wall of the salt tank is a conical wall inclined to the center direction thereof.

[0017] Further, a one-way valve is arranged on the connecting pipeline between the outlet of the salt tank and the switching valve.

[0018] The present application also provides a working method of the water softener, which is applied to the water softener described above, and the method comprises the following steps: operating the flow path switching piece of the switching valve, so that the water softener is in the first working state, and raw water is discharged as softened water through the softened water outlet after passing through the softening filter device; or, operating the flow path switching piece, so that the water softener is in the second working state, and raw water is discharged as waste water through the blowdown outlet after forming brine through the salt tank and then flowing through the softening filter device.

[0019] Advantages

[0020] Compared with the known prior art, the technical solution provided by the present application has the following advantages: By arranging the salt tank, the switching valve and the softening filter device coaxially from top to bottom, the whole device is integrated into a cylindrical shape, which greatly saves the installation space, and the pipeline connection is the shortest, and the appearance is simple and concise; By arranging the softening and regeneration modes, when regenerating, the brine enters from the bottom of the softening filter device and flows upwards through the resin, and the reverse flow mode is consistent with the water flow direction during softening, so that the regeneration efficiency is higher, the consumption of salt and water can be significantly reduced, and the water is dissolved during the process of passing through the salt, and the brine enters the resin for regeneration, so that the salt does not need to be dissolved in advance, and a large salt tank is not needed, and the product can be made small, which is suitable for narrow bathrooms. By using the conical bottom wall of the salt tank combined with the center water supply mode, the salt particles are guided to flow to the center and dissolve, which effectively prevents the salt from accumulating and hardening at the corners and causing waste. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a schematic diagram of the whole water softener in the embodiment of the present application; Figure 2 It is a schematic diagram of the exploded structure of the water softener in the embodiment of the present application; Figure 3 This is a partial cross-sectional schematic diagram of the water softener in an embodiment of the present invention; Figure 4 This is a front view of a cross-section of a water softener in an embodiment of the present invention; Figure 5 This is a schematic diagram of the current limiting unit structure in an embodiment of the present invention; Figure 6 This is an exploded view of the valve cover in an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the switching valve in an embodiment of the present invention; Figure 8 This is a schematic diagram of the central interface and water outlet structure in an embodiment of the present invention; Figure 9 This is a schematic diagram of the valve disc structure (soft water mode) in an embodiment of the present invention; Figure 10 This is a schematic diagram of the switching valve structure (soft water mode) in an embodiment of the present invention; Figure 11 This is a schematic diagram of the valve disc structure (regeneration mode) in an embodiment of the present invention; Figure 12 This is a schematic diagram of the switching valve structure (regeneration mode) in an embodiment of the present invention.

[0023] The labels in the diagram represent: 1. Brine tank; 11. Conical wall; 12. Hollow tube; 13. Flow limiting unit; 131. Pressure reducing valve; 132. Fine orifice; 133. Inclined channel; 14. Tank cover; 15. Brine tank outlet; 2. Switching valve; 2a. Raw water inlet; 2b. Softened water outlet; 2c. Sewage outlet; 2d. Central interface; 2e. Water outlet; 2f. Brine tank connection port; 2g. Raw water connection port; 2h. Softened water outlet connection port; 2i. 1. Sewage outlet connection port; 2j. Central outlet; 2k. Surrounding inlets; 2l. Central inlet; 22. Valve disc; 221. First connection port; 222. Second connection port; 223. Third connection port; 224. Fourth connection port; 225. Fifth connection port; 226. Sixth connection port; 227. Seventh connection port; 228. Eighth connection port; 229. Ninth connection port; 3. Softening filter device; 31. Ion exchange resin; 32. Annular space. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be set, or it can be detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0027] In the description of the present embodiment, the terms "up", "down", "left", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0028] The present application will be further described below in conjunction with the embodiments.

[0029] Embodiment:

[0030] Please refer to the accompanying Figures 1-12 The present application provides a multifunctional small soft water machine, please refer to Figure 1 The embodiment of the present application provides a highly integrated soft water machine.

[0031] The soft water machine adopts a compact stacked layout in the vertical direction. The core functional units, i.e. the salt tank 1 for storing regenerated salt, the switching valve 2 for controlling the on-off and flow direction of all water routes, and the softening filter device 3 containing ion exchange resin, are arranged in sequence from top to bottom.

[0032] Preferably, as Figure 1As shown, the central axes of the three functional units coincide, forming a coaxial whole, which not only gives the device a neat cylindrical shape, saving installation space, but more importantly makes the internal connecting pipelines the most direct and shortest, reducing the number of pipe joints, thereby improving the reliability and sealing of the system.

[0033] Specifically, the salt tank 1 located at the top of the device is a cylindrical container.

[0034] A key structural feature of the salt tank 1 is that its bottom is designed as a conical wall 11 tilted towards the center. This conical structure effectively guides the salt particles to slide and collect in the central area during the dissolution process, fundamentally avoiding the accumulation and hardening of salt at the right-angle corners of the tank's side wall and bottom, thereby ensuring that the salt is fully and uniformly utilized.

[0035] In the internal center of the salt tank 1, a hollow tube 12 is vertically arranged, with its lower end passing through the conical bottom wall 11 and being fixedly connected and in fluid communication with the lower switching valve 2.

[0036] The upper end of the hollow tube 12 is equipped with a flow limiting unit 13, which in this embodiment is a small pressure reducing valve 131. The pressure reducing valve 131 includes an elongated orifice 132, and above the orifice 132 are arranged several staggered inclined channels 133. When water flows out of the hollow tube 12, the inclined channels 133 and the orifice 132 are used to reduce the flow rate of the water. They are integrated and installed on a detachable tank cover 14, which is connected to the top end of the salt tank 1 by threads.

[0037] When the water flow is transported upward from the switching valve 2 through the hollow tube 12, it will first pass through the inclined channels 133 in the pressure reducing valve 131 to adjust the water pressure to a stable and low value, and then the water flow is forced to pass through the small-diameter orifice 132. Due to the sharp reduction in flow cross-section, the water flow rate is greatly limited, and finally the water flows out of the flow limiting unit 13 in the form of slow drops or fine streams.

[0038] This slow and uniform water inlet mode ensures that the water and the salt layer in the salt tank 1 have enough contact time, which is beneficial to the formation of saturated brine with stable concentration, significantly improves the utilization rate of salt and optimizes the regeneration effect.

[0039] The outlet of the salt tank 1 is located at the lowest point of the conical wall 11 and is connected to an interface on the side of the switching valve 2 through an external connecting pipeline.

[0040] It is worth noting that a one-way valve is installed on the connecting pipeline, which is designed to allow fluid to flow only from the salt tank 1 to the switching valve 2. This design is intended to prevent the reverse flow of water from the softening filter 3 into the salt tank 1 during the softening filtration process, causing salt water pollution or dilution.

[0041] Switching valve 2 as the control center of the whole system, between the salt tank 1 and softening filter device 3.

[0042] Its valve body is a multifunctional block with complex flow channels milled or cast inside, and it is provided with three external interfaces: raw water inlet 2a for connecting to tap water, softened water outlet 2b for supplying soft water to user end (such as shower), and blowdown port 2c for discharging waste water.

[0043] Inside the valve body, there are fixed water flow channels corresponding to the three interfaces, namely water inlet channel, water outlet channel and blowdown channel.

[0044] In addition, the top of the valve body is provided with an interface for connecting to the hollow tube 12 of the salt tank, and the bottom is provided with two independent interfaces for connecting to the top and bottom of the softening filter device 3.

[0045] The core control function is realized by a valve disc 22 rotatably installed in the valve body chamber. The valve disc 22 is disc-shaped, and its disc surface is provided with a plurality of through holes according to a predetermined logic, which are first connection port 221…- ninth connection port 229.

[0046] The internal fixed water flow channels of the valve body have corresponding ports with the through holes on the valve disc 22, including salt tank connection port 2f, raw water connection port 2g, softened water outlet connection port 2h, blowdown port connection port 2i, central water outlet port 2j, peripheral water inlet port 2k, and central port 2l. By rotating the valve disc 22 manually or electrically, the alignment between these through holes and ports can be accurately changed to realize the connection and / or closure of different channels.

[0047] It should be noted that the raw water connection port 2g on the valve body has two and is arranged adjacent to each other, respectively satisfying the two working state switches, so that the raw water connection port 2g is always communicated with the raw water inlet 2a.

[0048] Specifically, when the valve disc 22 is rotated to a certain angle (defined as the first working state), its internal channel will connect the raw water inlet 2a with the interface leading to the top of the softening filter device 3, while connecting the interface at the bottom of the softening filter device 3 with the softened water outlet 2b, and closing all paths leading to the salt tank 1 and blowdown port 2c.

[0049] When the valve disc 22 is rotated to another certain angle (defined as the second working state), its internal channel is recombined to connect the raw water inlet 2a with the interface leading to the top of the salt tank 1, and connect the interface at the bottom of the softening filter device 3 with the blowdown port 2c, while closing the softened water outlet 2b.

[0050] The softening filter device 3 constitutes the core execution unit of water treatment.

[0051] It comprises an outer cylindrical shell and a cylindrical resin filter core coaxially arranged in the shell.

[0052] The resin filter core is filled with sodium type cation exchange resin 31 as filter material, and a certain gap is reserved between the outer wall of the resin filter core and the inner wall of the shell, thereby forming an annular space 32 around the resin filter core.

[0053] The bottom of the resin filter core is closed, but a plurality of through holes are formed in the bottom wall thereof, and a center port 2d is arranged at the bottom center of the switching valve 2.

[0054] The center port 2d is sealingly connected to the top opening of the resin filter core through a pipeline or direct docking with the receiving port, thereby directly communicating with the inside of the resin filter core.

[0055] Around the center port 2d, a plurality of water flow ports 2e are annularly distributed at the bottom of the switching valve 2 and communicate with the upper part or top of the annular space 32, and these water flow ports 2e are used to make the annular space 32 communicate with the internal flow passage of the valve body.

[0056] Through the rotation control of the valve disc 22, the center port 2d can selectively communicate with one of the raw water inlet 2a, the softened water outlet 2b or the blowdown port 2c, or be closed.

[0057] Similarly, the internal flow passage of the valve body communicated by the annularly distributed water flow ports 2e can also be selectively communicated with one of the raw water inlet 2a, the softened water outlet 2b, the blowdown port 2c or the salt tank water inlet port, or be closed, through the switching of the valve disc 22.

[0058] That is, in the normal softening mode, i.e. the first working state, the user switches the valve disc 22 to the corresponding position, the through hole of the valve disc 22 communicates the raw water inlet 2a with the center port 2d, and the annular water flow port 2e communicates with the softened water outlet 2b, the tap water enters the switching valve 2 from the raw water inlet 2a, is guided by the valve disc 22, and then enters the inside of the resin filter core of the softening filter device 3 through the center port 2d. The water flows through the resin filter material 31 from top to bottom in the resin filter core, and in this process, the calcium and magnesium ions in the water exchange with the sodium ions on the resin, thereby being softened.

[0059] The softened water reaches the bottom of the resin filter core, flows out through the through holes in the bottom wall thereof, enters the annular space 32 between the outer wall of the resin filter core and the inner wall of the shell, and then flows upward in the annular space 32, reaches the top, enters the switching valve 2 through the annularly distributed water flow ports 2e, and is supplied to the user through the flow guidance of the valve disc 22 from the softened water outlet 2b.

[0060] Referring to the drawings Figures 9-10, first, tap water from the raw water inlet 2a via the raw water connection 2g into the four water inlet 2k, the valve disc 22 on the flow direction is the first connection 221 to the ninth connection 229, and the second connection 222, fifth connection 225 and eighth connection 228 with the valve body hole is not communicated; The tap water at the ninth connection 229 via the water flow 2e into the annular space 32, using resin filter core for softening of tap water, softened water via the center interface 2d into the center water outlet 2j, by the center water outlet 2j after the softened water outlet connection 2h flow into the with its communication softened water outlet 2b for user use, the valve disc 22 on the flow direction is the sixth connection 226 (with the center water outlet 2j corresponding) flow into the fourth connection 224 communicated with the softened water outlet connection 2h, and then flow into the with its communication softened water outlet 2b.

[0061] When the resin adsorption capacity close to saturation, need to regenerate, the user will switch valve disc 22 to regeneration mode, that is, the second working state, in the second working state (regeneration mode), at this time, tap water from the raw water inlet 2a into the switch valve 2, by the valve disc 22 to the salt tank 1 of the hollow tube 12, water flow through the pressure reducing and throttling of the flow limiting unit 13, slowly into the salt tank 1, dissolving salt particles to form a high concentration of saturated brine. Concentrated brine from the bottom outlet of the salt tank 1, through the one-way valve 4 into the switch valve 2, the valve disc 22 of the through hole is connected with the top interface of the salt tank 1 from the raw water inlet 2a to the salt tank 1, the annular water flow port 2e and the outlet of the salt tank 1 (after the water through the one-way valve 4) are communicated, and the center interface 2d and the drain 2c are communicated.

[0062] In the switch valve 2, the concentrated brine is guided by the valve disc 22 to the annular distribution of water flow port 2e, and enters the top of the annular space 32 of the softening filter device 3 through the water flow port. The salt water flows from top to bottom in the annular space 32, and enters the inside of the resin filter core from the bottom through the through hole on the bottom wall of the resin filter core after reaching the bottom.

[0063] More specifically, referring to the accompanying drawings Figure 11 - the accompanying drawings Figure 12 , first tap water from the raw water inlet 2a via the raw water connection 2g into the salt tank connection 2f, and the salt tank connection 2f is communicated with the hollow tube 12, the salt water from the salt tank 1 enters the center port 2l via the annular distribution of the salt tank outlet 15 at the bottom of the salt tank 1, and then enters the annular space 32 from the center port 2l via the four water inlets 2k.

[0064] The corresponding flow path on the valve disc 22 is that the raw water inlet 2a outputs tap water to the second connecting port 222, the tap water in the second connecting port 222 flows into the hollow pipe 12 through the third connecting port 223, the brine flowing out of the salt tank 1 enters the seventh connecting port 227 through the annular salt tank water outlet 15 at the bottom of the salt tank 1, and then enters the annular space 32 through the seventh connecting port 227 and the eighth connecting port 228. The resin filter core is used to regenerate the brine, the waste water generated after regeneration flows into the sewage outlet 2c through the central water outlet 2j and the sewage outlet connecting port 2i, and the corresponding regenerated brine flows into the fifth connecting port 225 through the eighth connecting port 228, then flows to the fourth connecting port 224 connected with the sewage outlet 2c, and finally flows out of the sewage outlet 2c.

[0065] Subsequently, the brine flows through the resin filter material 31 in the resin filter core from bottom to top, and the regeneration process is completed. The waste water generated after regeneration, which is rich in calcium and magnesium ions, reaches the top of the resin filter core and is discharged from the top opening thereof, and then returns to the switching valve 2 through the central interface 2d. In the switching valve 2, the waste water is guided by the valve disc 22 to the sewage passage, and finally is discharged into the sewer through the sewage outlet 2c.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones. Such modifications or replacements do not change the essence of the corresponding technical solutions, and do not deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A multifunctional compact water softener, characterized by, The application relates to a water softening device, which comprises a salt tank (1), a switching valve (2) and a softening filter device (3), wherein the salt tank (1), the switching valve (2) and the softening filter device (3) are arranged in sequence along the vertical direction. The switching valve (2) has a raw water inlet (2a), a softened water outlet (2b) and a blowdown outlet (2c). The switching valve (2) is provided with a fluid passage and a flow path switching piece, and the flow path switching piece can be operated to change the connection state of the fluid passage, so that the water softener has: A first working state, wherein the raw water inlet (2a) is communicated with the inlet of the softening filter device (3) via the fluid passage, and the outlet of the softening filter device (3) is communicated with the softened water outlet (2b) via the fluid passage; and A second working state, wherein the raw water inlet (2a) is communicated with the inlet of the salt tank (1) via the fluid passage, the outlet of the salt tank (1) is communicated with the inlet of the softening filter device (3) via the fluid passage, and the outlet of the softening filter device (3) is communicated with the blowdown outlet (2c) via the fluid passage. The salt tank (1), the switching valve (2) and the softening filter device (3) are coaxially arranged.

2. The multi-functional compact water softener according to claim 1, wherein The flow path switching piece is a valve disc (22) rotatably arranged in the switching valve (2), the switching valve (2) is provided with a fixed water flow channel, and the alignment between the through hole on the valve disc (22) and the fixed water flow channel is adjusted by rotating the valve disc (22), so that the switching between the first working state and the second working state is realized.

3. The multi-functional compact water softener according to claim 1, wherein The softening filter device (3) comprises a shell, a resin filter core coaxially arranged in the shell and ion exchange resin (31) filled in the resin filter core, an annular space (32) is formed between the outer wall of the resin filter core and the inner wall of the shell, the bottom of the resin filter core is provided with a through hole, and the top is provided with an opening; 4. The multi-functional compact water softener according to claim 3, wherein In the first working state, the through hole of the valve disc (22) communicates the raw water inlet (2a) with the top opening of the resin filter core and communicates the lower part of the annular space (32) with the softened water outlet (2b); In the second working state, the through hole of the valve disc (22) communicates the outlet of the salt tank (1) with the lower part of the annular space (32) and communicates the top opening of the resin filter core with the blowdown outlet (2c). The salt tank (1) is provided with a flow limiting unit (13) for reducing and / or limiting the flow rate of water flowing into the interior thereof.

5. The multi-functional compact water softener according to claim 1, wherein The flow limiting unit (13) is a pressure reducing valve (131) arranged in the salt tank (1), and a plurality of fine holes (132) are distributed in the pressure reducing valve (131).

6. The multi-functional compact water softener according to claim 5, wherein The salt tank (1) is provided with a vertical hollow tube (12), and the flow limiting unit (13) is installed at the top end of the hollow tube (12).

7. The multi-functional compact water softener according to claim 6, wherein The bottom wall of the salt tank (1) is a conical wall (11) inclined to the center direction.

8. The multi-functional compact water softener according to claim 1, wherein A one-way valve (4) is arranged on the connecting pipeline between the outlet of the salt tank (1) and the switching valve (2).

9. The multi-functional compact water softener according to claim 1, wherein The method comprises:

10. A method of operating a water softener as claimed in any one of claims 1 to 9, wherein, ​ The flow path switching piece of the switching valve (2) is operated to make the water softener in the first working state, so that raw water passes through the softening filter device (3) and is discharged from the softened water outlet (2b) to discharge softened water; Or, The flow path switching piece is operated to make the water softener in the second working state, so that raw water passes through the salt tank (1) to form brine and then flows through the softening filter device (3), and waste water is discharged from the blowdown outlet (2c).

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