Water purifier and water purification method

Abstract

The invention relates to the technical field of water purification, in particular to a water purifier and a water purification method. The water purifier comprises a water inlet pipeline, a reverse osmosis filter element, a pure water outlet pipe, a wastewater outlet pipe, a regulating valve assembly and a pure water return pipeline, an inlet of the water inlet pipeline is communicated with a raw water supply end, a booster pump and a first control valve are arranged on the water inlet pipeline, and a raw water inlet of the reverse osmosis filter element is communicated with an outlet of the water inlet pipeline; the pure water outlet pipe is communicated with a pure water outlet of the reverse osmosis filter element, the waste water outlet pipe is communicated with a concentrated water outlet of the reverse osmosis filter element, the pure water backflow pipeline can enable part of pure water in the pure water outlet pipe to flow back into the water inlet pipeline, and the adjusting valve assembly adjusts the drainage flow of the waste water outlet pipe. The drainage flow of the waste water outlet pipe is adjusted through the adjusting valve assembly, then the flow of the pure water flowing back in the pure water backflow pipeline is adjusted, the content of the pure water mixed in the water inlet pipeline is increased, the TDS value of the first cup of water is effectively reduced, and operation is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and in particular to a water purifier and a water purification method. Background Art

[0002] Existing water purifiers mainly rely on reverse osmosis filters to filter raw water to obtain the required pure water. However, when the water purifier is in standby mode, raw water, concentrated water and pure water will exist in the reverse osmosis filter at the same time, where the raw water and concentrated water are both in front of the membrane of the reverse osmosis filter, and the pure water is behind the membrane of the reverse osmosis filter. In addition, the TDS (Total Dissolved Solids) of the raw water and concentrated water is much greater than the TDS of pure water. If the water purifier is in standby mode for a long time, the ions in the raw water and concentrated water in the reverse osmosis filter will diffuse into the pure water, thereby increasing the TDS of the pure water. When the water purifier is turned on to take out pure water next time, the TDS value of the first cup of pure water produced will be relatively high, affecting the user experience.

[0003] In the related art, a water storage tank is usually set up to flush the reverse osmosis filter element, which makes the operation complicated. Alternatively, a pure water return pipeline is connected to the pure water outlet pipe, and the pure water in the pure water outlet pipe is returned to the reverse osmosis filter element through the pure water return pipeline, so that the raw water and the returned pure water are used to flush the reverse osmosis filter element together. Only by returning a constant amount of pure water mixed with raw water through the pure water return pipeline to flush the reverse osmosis filter element, the TDS value in the reverse osmosis filter element cannot be continuously reduced, resulting in the inability to effectively reduce the TDS value of the first cup of water.

[0004] Therefore, there is an urgent need for a water purifier and a water purification method to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a water purifier and a water purification method to adjust the flow rate of pure water returning in the pure water return pipeline, increase the content of mixed pure water in the water inlet pipeline, effectively reduce the TDS value of the first cup of water, and the operation is simple.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A water purifier, comprising:

[0008] A water inlet pipeline, the inlet of which is used to communicate with the raw water supply end, and a booster pump and a first control valve are provided on the water inlet pipeline;

[0009] A reverse osmosis filter element, wherein the raw water inlet of the reverse osmosis filter element is connected to the outlet of the water inlet pipeline;

[0010] A pure water outlet pipe connected to the pure water outlet of the reverse osmosis filter element;

[0011] A wastewater outlet pipe is connected to the concentrated water outlet of the reverse osmosis filter element;

[0012] A pure water reflux pipeline, wherein the water inlet of the pure water reflux pipeline is connected to the pure water outlet pipe, the water outlet of the pure water reflux pipeline is connected to the water inlet pipeline, and the pure water reflux pipeline can reflux part of the pure water in the pure water outlet pipe to the water inlet pipeline;

[0013] The regulating valve assembly is arranged on the wastewater outlet pipe, and the regulating valve assembly is configured to adjust the drainage flow of the wastewater outlet pipe, and the drainage flow of the wastewater outlet pipe is adjusted by the regulating valve assembly, thereby adjusting the flow of pure water returning in the pure water return pipeline.

[0014] As an optional solution, the regulating valve assembly includes a first wastewater valve and a second wastewater valve, and the first wastewater valve and the second wastewater valve are connected in series to the wastewater outlet pipe.

[0015] As an optional solution, the regulating valve assembly includes an adjustable wastewater valve, which is arranged on the wastewater outlet pipe and is configured to steplessly adjust the drainage flow of the wastewater outlet pipe or to stepfully adjust the drainage flow of the wastewater outlet pipe in multiple gears.

[0016] As an optional solution, the water purifier further includes:

[0017] A post-filter element is connected to the pure water outlet pipe. Along the flow direction of water in the pure water outlet pipe, the connection point between the water inlet of the pure water reflux pipeline and the pure water outlet pipe is located downstream of the post-filter element.

[0018] As an optional solution, the water purifier further includes:

[0019] The first TDS detection component is communicatively connected with the regulating valve assembly. The first TDS detection component is arranged on the water inlet pipe. The first TDS detection component is configured to detect the TDS value of water in the water inlet pipe, and the regulating valve assembly can adjust the drainage flow of the wastewater outlet pipe according to the detection value of the first TDS detection component.

[0020] A water purification method is applied to the water purifier as described above, and the water purification method comprises the following steps:

[0021] The water purifier starts a backflow water flushing mode;

[0022] When the water purifier turns on the reflux water flushing mode, the reverse osmosis filter element starts water production, the pure water reflux pipeline returns part of the pure water in the pure water outlet pipe to the water inlet pipeline, and adjusts the drainage flow of the waste water outlet pipe through the regulating valve assembly, thereby adjusting the flow of the pure water refluxed in the pure water reflux pipeline.

[0023] As an optional solution, the reflux water flushing mode includes a first reflux mode and a second reflux mode. The water purifier first works in the first reflux mode. When it is detected that the TDS value of the water in the water inlet pipeline before entering the reverse osmosis filter element is less than a first preset value, the water purifier works in the second reflux mode. When it is detected that the TDS value of the water in the water inlet pipeline before entering the reverse osmosis filter element is less than a second preset value, the reflux water flushing mode stops.

[0024] Among them, when the water purifier works in the first reflux mode, the regulating valve assembly adjusts the drainage flow of the wastewater outlet pipe to a first preset flow; when the water purifier works in the second reflux mode, the regulating valve assembly adjusts the drainage flow of the wastewater outlet pipe to a second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value.

[0025] As an optional solution, before the water purifier starts the backflow water flushing mode, the TDS value of the water in the water inlet pipeline before entering the reverse osmosis filter element is TSD 初始 , then the first preset value is aTSD 初始 The second preset value is bTSD 初始 , and a>b.

[0026] As an optional solution, the reflux water-making and flushing mode includes a first reflux mode and a second reflux mode. When it is detected that the water quality of the water produced by the water purifier is lower than a preset water quality, and when the water purifier turns on the reflux water-making and flushing mode, the water purifier first works in the first reflux mode. When it is detected that the TDS value of the water in the water inlet pipeline before entering the reverse osmosis filter element is less than a first preset value, the water purifier works in the second reflux mode. When it is detected that the TDS value of the water in the water inlet pipeline before entering the reverse osmosis filter element is less than a second preset value, the reflux water-making and flushing mode is stopped.

[0027] When it is detected that the water quality of the water produced by the water purifier is not lower than the preset water quality, and when the water purifier turns on the backflow water production and flushing mode, the water purifier directly works in the second backflow mode, and when it is detected that the TDS value of the water in the water inlet pipeline before entering the reverse osmosis filter element is less than the second preset value, the backflow water production and flushing mode is stopped;

[0028] Among them, when the water purifier works in the first reflux mode, the regulating valve assembly adjusts the drainage flow of the wastewater outlet pipe to a first preset flow; when the water purifier works in the second reflux mode, the regulating valve assembly adjusts the drainage flow of the wastewater outlet pipe to a second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value.

[0029] As an optional solution, when the water purifier starts the backflow water flushing mode and adjusts the drainage flow of the wastewater outlet pipe through the regulating valve assembly, the regulating valve assembly gradually reduces the drainage flow of the wastewater outlet pipe until the regulating valve assembly is closed.

[0030] As an optional solution, before the water purifier starts the backflow water flushing mode, the water purifier starts the flushing mode. When the water purifier starts the flushing mode, the reverse osmosis filter element stops making water, the regulating valve assembly adjusts the drainage flow of the wastewater outlet pipe to the maximum, and the raw water in the water inlet pipeline is discharged through the reverse osmosis filter element and the wastewater outlet pipe in turn. When the water purifier starts the flushing mode for a first preset time, the water purifier starts the backflow water flushing mode.

[0031] Beneficial effects of the present invention:

[0032] The present invention provides a water purifier, which is provided with a pure water reflux pipeline, and the pure water reflux pipeline can reflux part of the pure water in the pure water outlet pipe to the water inlet pipeline, and by providing a regulating valve assembly on the wastewater outlet pipe, the drainage flow of the wastewater outlet pipe is adjusted by the regulating valve assembly, and then the flow of the pure water refluxed in the pure water reflux pipeline is adjusted, the content of the mixed pure water in the water inlet pipeline is increased, the flushing effect on the reverse osmosis filter element is increased, and the TDS value of the water in the reverse osmosis filter element is effectively reduced, thereby effectively reducing the TDS value of the first cup of water. In addition, by adjusting the drainage flow of the wastewater outlet pipe, the flow of the refluxed pure water can be adjusted, thereby improving the flushing effect on the reverse osmosis filter element, making the operation simple.

[0033] In the present invention, the drainage flow of the wastewater outlet pipe is adjusted by the regulating valve assembly, and the membrane front pressure of the reverse osmosis filter element can be adjusted, thereby adjusting the flow of pure water in the pure water outlet pipe. Since the water inlet of the pure water return pipeline is connected to the pure water outlet pipe, the flow of pure water refluxed in the pure water return pipeline can be adjusted. When the regulating valve assembly reduces the drainage flow of the wastewater outlet pipe, the membrane front pressure of the reverse osmosis filter element increases, thereby increasing the flow of pure water in the pure water outlet pipe, and then increasing the flow of pure water refluxed in the pure water return pipeline. Since the flow entering the reverse osmosis filter element is a fixed value, the flow of raw water flowing into the water inlet pipeline will be reduced at this time, which can ensure that the pure water content in the water entering the reverse osmosis filter element increases, and is also conducive to ensuring that the drainage flow of the wastewater outlet pipe is reduced.

[0034] The present invention also provides a water purification method, which is applied to the above-mentioned water purifier. The drainage flow of the wastewater outlet pipe is adjusted by the regulating valve assembly, and then the flow of pure water returning in the pure water return pipeline is adjusted, thereby effectively reducing the TDS value of the first cup of water and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of a water purifier provided in Embodiment 1 of the present invention;

[0036] Figure 2 is a flow chart of a water purification method provided in Embodiment 1 of the present invention;

[0037] Figure 3 is a schematic structural diagram of a water purifier provided in Embodiment 2 of the present invention;

[0038] Figure 4 is a flow chart of a water purification method provided in Embodiment 2 of the present invention;

[0039] Figure 5 This is a flow chart of the water purification method provided in Example 3 of the present invention.

[0040] In the figure:

[0041] 1. Water inlet pipeline; 11. Booster pump; 12. First control valve; 2. Reverse osmosis filter element; 3. Pure water outlet pipe; 31. Second check valve; 32. High-pressure switch; 4. Wastewater outlet pipe; 5. Regulating valve assembly; 51. First wastewater valve; 52. Second wastewater valve; 53. Adjustable wastewater valve; 6. Pure water reflux pipeline; 61. Second control valve; 62. First check valve; 7. Composite filter element; 8. First TDS detection component; 9. Second TDS detection component. DETAILED DESCRIPTION

[0042] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] Embodiment 1

[0047] In the related technologies of water purifiers, a water storage tank is usually set up to flush the reverse osmosis filter element to reduce the TDS value of the first cup of water, but the operation is complicated. Alternatively, a pure water return pipeline is connected to the pure water outlet pipe, and the pure water in the pure water outlet pipe is returned to the reverse osmosis filter element through the pure water return pipeline, so that the raw water and the returned pure water are used to flush the reverse osmosis filter element together. Only by returning a constant amount of pure water mixed with raw water through the pure water return pipeline to flush the reverse osmosis filter element, the TDS value in the reverse osmosis filter element cannot be continuously reduced, resulting in the inability to effectively reduce the TDS value of the first cup of water.

[0048] In order to solve the above problems, Figure 1As shown, this embodiment provides a water purifier, which includes a water inlet pipeline 1, a reverse osmosis filter element 2, a pure water outlet pipe 3, a waste water outlet pipe 4, a regulating valve assembly 5 and a pure water reflux pipeline 6, wherein the inlet of the water inlet pipeline 1 is used to be connected with the raw water supply end, a booster pump 11 and a first control valve 12 are arranged on the water inlet pipeline 1, the raw water inlet of the reverse osmosis filter element 2 is connected with the outlet of the water inlet pipeline 1, the pure water outlet pipe 3 is connected with the pure water outlet of the reverse osmosis filter element 2, and the waste water outlet pipe 4 is connected with the reverse osmosis filter element 2. The concentrated water outlet of the core 2 is connected, the water inlet of the pure water reflux pipe 6 is connected with the pure water outlet pipe 3, the water outlet of the pure water reflux pipe 6 is connected with the water inlet pipe 1, the pure water reflux pipe 6 can return part of the pure water in the pure water outlet pipe 3 to the water inlet pipe 1, the regulating valve assembly 5 is arranged on the wastewater outlet pipe 4, the regulating valve assembly 5 is used to adjust the drainage flow of the wastewater outlet pipe 4, and the drainage flow of the wastewater outlet pipe 4 is adjusted by the regulating valve assembly 5, thereby adjusting the flow of pure water refluxed in the pure water reflux pipe 6. The water purifier provided in this embodiment returns part of the pure water of the pure water outlet pipe 3 to the water inlet pipe 1 by setting a pure water reflux pipe 6, and adjusts the drainage flow of the wastewater outlet pipe 4 by the regulating valve assembly 5, thereby adjusting the flow of the pure water refluxed in the pure water reflux pipe 6, increasing the content of the mixed pure water in the water inlet pipe 1, improving the flushing effect on the reverse osmosis filter element 2, and effectively reducing the TDS value of the water entering the reverse osmosis filter element 2, thereby effectively reducing the TDS value of the first cup of water. In addition, by adjusting the drainage flow of the wastewater outlet pipe 4, the flow of the refluxed pure water can be adjusted, thereby improving the flushing effect on the reverse osmosis filter element 2, making the operation simple.

[0049] In this embodiment, the drainage flow of the wastewater outlet pipe 4 is adjusted by the regulating valve assembly 5, and the membrane front pressure of the reverse osmosis filter element 2 can be adjusted, thereby adjusting the flow of pure water in the pure water outlet pipe 3. Since the water inlet of the pure water return line 6 is connected to the pure water outlet pipe 3, the flow of pure water refluxed in the pure water return line 6 can be adjusted. Specifically, when the regulating valve assembly 5 reduces the drainage flow of the wastewater outlet pipe 4, the membrane front pressure of the reverse osmosis filter element 2 increases, thereby increasing the flow of pure water in the pure water outlet pipe 3, and then increasing the flow of pure water refluxed in the pure water return line 6. Since the flow entering the reverse osmosis filter element 2 is a constant value, the flow of raw water flowing into the water inlet pipe 1 will be reduced at this time, which can ensure that the pure water content in the water entering the reverse osmosis filter element 2 increases, and it is also beneficial to ensure that the drainage flow of the wastewater outlet pipe 4 is reduced.

[0050] It should be noted that when the water purifier is working normally to produce water, the boost pump 11 and the first control valve 12 are started, and the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the maximum. At this time, the raw water provided by the raw water supply end enters the reverse osmosis filter element 2 through the raw water inlet of the reverse osmosis filter element 2, and is filtered by the reverse osmosis filter element 2. The pure water produced is passed through the pure water outlet of the reverse osmosis filter element 2 to the pure water outlet pipe 3, and the concentrated water produced is passed through the concentrated water outlet of the reverse osmosis filter element 2 to the wastewater outlet pipe 4.

[0051] Optionally, in this embodiment, if Figure 1 As shown, the pure water return pipeline 6 is provided with a second control valve 61 and a first check valve 62. By providing the second control valve 61, it is convenient to control the on-off of the pure water return pipeline 6. In addition, by providing the first check valve 62, the backflow of pure water in the pure water return pipeline 6 is avoided, and the problem of reverse rotation of the booster pump 11 is avoided, thereby ensuring the reliability of the work.

[0052] Optionally, in the present embodiment, a second check valve 31 and a high-pressure switch 32 are provided on the pure water outlet pipe 3, and along the flow direction of water in the pure water outlet pipe 3, the high-pressure switch 32 is located downstream of the second check valve 31. By providing the second check valve 31, the backflow of pure water in the pure water outlet pipe 3 is avoided, the problem of reverse rotation of the booster pump 11 is avoided, and the reliability of the work is ensured. In the present embodiment, the high-pressure switch 32 has the function of cutting off the power supply and shutting down. In addition, the high-pressure switch 32 can also prevent the booster pump 11 from fully rotating. Since the specific working principle and structure of the high-pressure switch 32 belong to the prior art, they will not be repeated here.

[0053] Optionally, in the present embodiment, the water purifier further comprises a first TDS detection member 8, the first TDS detection member 8 is communicatively connected with the regulating valve assembly 5, the first TDS detection member 8 is arranged on the water inlet pipeline 1, the first TDS detection member 8 is used to detect the TDS value of the water in the water inlet pipeline 1, and the regulating valve assembly 5 can adjust the drainage flow of the wastewater outlet pipe 4 according to the detection value of the first TDS detection member 8. Optionally, in the present embodiment, the first TDS detection member 8 can be a TDS sensor.

[0054] Optionally, in this embodiment, when pure water is refluxed through the pure water reflux pipeline 6, the booster pump 11 and the first control valve 12 are both in the open state, and when pure water is refluxed through the pure water reflux pipeline 6, it first works in the first reflux mode, and when the first TDS detection component 8 detects that the TDS value of the water in the water inlet pipeline 1 before entering the reverse osmosis filter element 2 is less than the first preset value, it works in the second reflux mode, and when the first TDS detection component 8 detects that the TDS value of the water in the water inlet pipeline 1 before entering the reverse osmosis filter element 2 is less than the second preset value, the pure water reflux pipeline 6 stops refluxing pure water. It should be noted that when working in the first reflux mode, the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the first preset flow, and when the water purifier works in the second reflux mode, the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value. The above arrangement enables the pure water return pipe 6 to first flush the reverse osmosis filter element 2 with a small flow rate of pure water return. When the detection value of the first TDS detection element 8 is less than the first preset value, the pure water return pipe 6 will then flush the reverse osmosis filter element 2 with a large flow rate of pure water return, thereby gradually increasing the amount of pure water to flush the reverse osmosis filter element 2, thereby improving the flushing effect of the reverse osmosis filter element 2.

[0055] Optionally, in this embodiment, before the pure water return pipe 6 returns the pure water, the first TDS detection element 8 detects that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is TSD 初始 , then the first preset value is aTSD 初始 The second preset value is bTSD 初始 , and a>b. The above numerical limits can meet the water quality filtration requirements of different regions. Optionally, in this embodiment, a=(V1+V3 / 2) / V2, b=V1 / V2, wherein V1 is the amount of pure water refluxed by the pure water reflux pipeline 6, V2 is the total amount of raw water and refluxed pure water in the water inlet pipeline 1, and V3 is the amount of concentrated water produced. That is, in this embodiment, the first preset value is (V1+V3 / 2) / V2·TSD 初始 , the second preset value is V1 / V2·TSD 初始 .

[0056] Optionally, in this embodiment, if Figure 1 As shown, the water purifier also includes a second TDS detection member 9, which is arranged on the pure water outlet pipe 3, and is used to detect the TDS value of the pure water in the pure water outlet pipe 3. By setting the second TDS detection member 9, it is convenient to monitor the TDS value of the pure water discharged from the pure water outlet pipe 3 in real time to ensure the safety of water used by users. Optionally, in this embodiment, the second TDS detection member 9 can be a TDS sensor.

[0057] In this embodiment, if Figure 1 As shown, the water purifier also includes a composite filter element 7, which includes a pre-filter element and a post-filter element. The pre-filter element is connected to the water inlet pipe 1, and along the flow direction of water in the water inlet pipe 1, the pre-filter element is located upstream of the reverse osmosis filter element 2, and the connection between the outlet of the pure water return pipe 6 and the water inlet pipe 1 is located between the pre-filter element and the reverse osmosis filter element 2, and the post-filter element is connected to the pure water outlet pipe 3, and along the flow direction of water in the pure water outlet pipe 3, the connection between the water inlet of the pure water return pipe 6 and the pure water outlet pipe 3 is located downstream of the post-filter element. By setting the composite filter element 7, when the water purifier is working normally in water production, the boost pump 11 and the first control valve 12 are started, and the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the maximum. At this time, the raw water provided by the raw water supply end is preliminarily filtered through the pre-filter element in the composite filter element 7, and then enters the reverse osmosis filter element 2 for filtration. The pure water produced in the reverse osmosis filter element 2 is passed into the pure water outlet pipe 3 through the pure water outlet of the reverse osmosis filter element 2, and is discharged after being filtered by the post-filter element of the composite filter element 7 in the pure water outlet pipe 3. The concentrated water produced in the reverse osmosis filter element 2 is passed into the wastewater outlet pipe 4 through the concentrated water outlet of the reverse osmosis filter element 2, thereby effectively ensuring the filtering effect of the water purifier on the raw water. In addition, the connection method of the above-mentioned pure water return pipe 6 allows the pure water in the pure water outlet pipe 3 to pass through the post-filter element and then flow back to the front end of the reverse osmosis filter element 2 through the pure water return pipe 6, so that the water at the rear end of the reverse osmosis filter element 2 can flow, avoiding the presence of dead water in the pipeline at the rear end of the reverse osmosis filter element 2 and the post-filter element, avoiding the growth of bacteria in the pipeline at the rear end of the reverse osmosis filter element 2 and the post-filter element, and ensuring the safety of water used by the water purifier.

[0058] In this embodiment, if Figure 1 As shown, the regulating valve assembly 5 includes a first wastewater valve 51 and a second wastewater valve 52, and the first wastewater valve 51 and the second wastewater valve 52 are connected in series to the wastewater outlet pipe 4. It should be noted that the wastewater valve is composed of a solenoid valve provided with a small hole. When the wastewater valve is closed, the concentrated water in the wastewater outlet pipe 4 can only flow out from the small hole, and its flow rate is limited. The flow rate depends on the water pressure and the size of the small hole. When the wastewater valve is opened, the wastewater valve does not have a flow limiting effect at this time. In this embodiment, when the water purifier is working normally to make water, the first wastewater valve 51 and the second wastewater valve 52 are both in an open state, ensuring that the drainage flow of the wastewater outlet pipe 4 is opened to the maximum, avoiding the regulating valve assembly 5 from limiting the flow of the concentrated water in the wastewater outlet pipe 4. In this embodiment, when the pure water return pipeline 6 works in the first return mode, the first waste water valve 51 is closed, the second waste water valve 52 is opened, and the aperture of the small hole of the first waste water valve 51 is larger than the aperture of the small hole of the second waste water valve 52. When the pure water return pipeline 6 works in the second return mode, the first waste water valve 51 is opened and the second waste water valve 52 is closed, thereby ensuring that the first preset flow rate is greater than the second preset flow rate.

[0059] like Figure 2 As shown, this embodiment also provides a water purification method, which is applied to the above-mentioned water purifier, and the water purification method includes the following steps:

[0060] The water purifier starts the backflow water flushing mode;

[0061] When the water purifier starts the reflux water flushing mode, the reverse osmosis filter element 2 starts water production, and the pure water reflux pipeline 6 returns part of the pure water in the pure water outlet pipe 3 to the water inlet pipeline 1, and adjusts the drainage flow of the waste water outlet pipe 4 through the regulating valve assembly 5, thereby adjusting the flow of the pure water refluxed in the pure water reflux pipeline 6.

[0062] It should be noted that when the water purifier turns on the reflux water flushing mode, the booster pump 11 and the first control valve 12 are both in the open state. The water purification method provided in this embodiment adjusts the drainage flow of the wastewater outlet pipe 4 through the regulating valve assembly 5, and then adjusts the flow of the pure water refluxed in the pure water reflux pipeline 6, effectively reducing the TDS value of the first cup of water, and the operation is simple.

[0063] In this embodiment, if Figure 1 and Figure 2 As shown, the backflow water flushing mode includes a first backflow mode and a second backflow mode. When the water purifier turns on the backflow water flushing mode, the water purifier first works in the first backflow mode. When it is detected that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is less than the first preset value, the water purifier works in the second backflow mode. When it is detected that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is less than the second preset value, the backflow water flushing mode stops. Among them, when the water purifier works in the first backflow mode, the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the first preset flow. When the water purifier works in the second backflow mode, the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value. The above arrangement enables the pure water reflux pipeline 6 to first flush the reverse osmosis filter element 2 with a small flow of pure water reflux. When the detection value of the first TDS detection element 8 is less than the first preset value, the pure water reflux pipeline 6 flushes the reverse osmosis filter element 2 with a large flow of pure water reflux, thereby improving the flushing effect of the reverse osmosis filter element 2. It should be noted that when the water purifier works in the first reflux mode, the first waste water valve 51 is closed and the second waste water valve 52 is opened. When the water purifier works in the second reflux mode, the first waste water valve 51 is opened and the second waste water valve 52 is closed.

[0064] In this embodiment, before the water purifier starts the backflow water flushing mode, the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is TSD初始 , then the first preset value is aTSD 初始 The second preset value is bTSD 初始 , and a>b. The above numerical limits can meet the water quality filtration requirements of different regions. It should be noted that, in this embodiment, a=(V1+V3 / 2) / V2, b=V1 / V2, wherein V1 is the amount of pure water refluxed by the pure water reflux pipeline 6, V2 is the total amount of raw water and refluxed pure water in the water inlet pipeline 1, and V3 is the amount of concentrated water produced. That is, the first preset value is (V1+V3 / 2) / V2·TSD 初始 , the second preset value is V1 / V2·TSD 初始 .

[0065] In this embodiment, if Figure 1 and Figure 2 As shown, before the water purifier starts the backflow water flushing mode, the water purifier starts the flushing mode. When the water purifier starts the flushing mode, the reverse osmosis filter element 2 stops making water, and the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the maximum. The raw water in the water inlet pipe 1 is discharged through the reverse osmosis filter element 2 and the wastewater outlet pipe 4 in turn. When the water purifier starts the flushing mode and reaches the first preset time, the water purifier starts the backflow water flushing mode. The above setting enables the water purifier to flush the reverse osmosis filter element 2 with the raw water in the water inlet pipe 1 before starting the backflow water flushing mode, thereby improving the flushing efficiency of the reverse osmosis filter element 2. It should be noted that when the water purifier starts the flushing mode, the first wastewater valve 51 and the second wastewater valve 52 are both in the open form, thereby ensuring that the drainage flow of the wastewater outlet pipe 4 is opened to the maximum. It should be noted that the first preset time can be set according to demand.

[0066] Optionally, in this embodiment, if Figure 2 As shown, when the water purifier stops making water for a second preset time, the water purifier starts the flushing mode, thereby ensuring that the reverse osmosis filter element 2 is flushed in time to ensure the service life of the reverse osmosis filter element 2. It should be noted that the second preset time can be set according to demand.

[0067] Embodiment 2

[0068] The water purifier and water purification method provided in this embodiment are basically the same as those in the first embodiment. The water purifier and water purification method provided in this embodiment are different from those in the first embodiment in that:

[0069] In this embodiment, if Figure 3As shown, the regulating valve assembly 5 includes an adjustable wastewater valve 53, which is arranged on the wastewater outlet pipe 4, and the adjustable wastewater valve 53 is configured to adjust the drainage flow of the wastewater outlet pipe 4 in multiple gears and in steps. By designing the regulating valve assembly 5 in the form of an adjustable wastewater valve 53, the structure is simple and the adjustment is more flexible and convenient. It should be noted that the specific structure and working principle of the adjustable wastewater valve 53 for adjusting the drainage flow of the wastewater outlet pipe 4 in multiple gears and in steps belong to the prior art, and will not be repeated here.

[0070] Alternatively, if Figure 4 As shown, in the water purification method provided by the present embodiment, when it is detected that the water quality of the water produced by the water purifier is lower than the preset water quality, and when the water purifier starts the backflow water production and flushing mode, the water purifier first works in the first backflow mode, and when it is detected that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is less than the first preset value, the water purifier works in the second backflow mode, and when it is detected that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is less than the second preset value, the backflow water production and flushing mode is stopped;

[0071] When it is detected that the water quality of the water purifier is not lower than the preset water quality, and when the water purifier starts the backflow water flushing mode, the water purifier directly works in the second backflow mode. When it is detected that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is less than the second preset value, the backflow water flushing mode stops;

[0072] Among them, when the water purifier works in the first reflux mode, the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the first preset flow; when the water purifier works in the second reflux mode, the regulating valve assembly 5 adjusts the drainage flow of the wastewater outlet pipe 4 to the second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value.

[0073] The above arrangement ensures that when the water quality of the water purifier is poor, the pure water return pipe 6 first flushes the reverse osmosis filter element 2 with a small flow rate of pure water return. When the detection value of the first TDS detection element 8 is less than the first preset value, the pure water return pipe 6 flushes the reverse osmosis filter element 2 with a large flow rate of pure water return, thereby improving the flushing effect of the reverse osmosis filter element 2 and avoiding the situation that the pure water return pipe 6 directly flushes the reverse osmosis filter element 2 with a large flow rate of pure water return. At this time, the opening of the adjustable waste water valve 53 is small, and the raw water in the water inlet pipe 1 is not fully mixed with the refluxed pure water at the moment of backflow water making and flushing, and directly passes through the reverse osmosis filter element 2 to the adjustable waste water valve 53. If the water quality is poor and there are more impurities, the adjustable waste water valve 53 will be blocked. When the water quality of the water purifier is good, the pure water return pipe 6 directly flushes the reverse osmosis filter element 2 with a large flow rate of pure water return, thereby effectively improving the rate of backflow water making and flushing. Therefore, it can be seen from the above that the water purifier selects different backflow water flushing modes according to the difference in water quality for water production, which is more intelligent. On the basis of ensuring the improvement of the backflow water flushing rate, it effectively avoids the problem of blockage of the adjustable wastewater valve 53 and ensures the reliability of the adjustable wastewater valve 53.

[0074] Optionally, in this embodiment, when the water purifier is producing water, when the first TDS detection component 8 detects that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is less than or equal to 300, it is determined that the water quality of the water purifier is not lower than the preset water quality; when the first TDS detection component 8 detects that the TDS value of the water in the water inlet pipe 1 before entering the reverse osmosis filter element 2 is greater than 300, it is determined that the water quality of the water purifier is lower than the preset water quality.

[0075] Optionally, in this embodiment, the adjustable wastewater valve 53 has four gears, and the four gears of the adjustable wastewater valve 53 are respectively 1 gear, 2 gear, 3 gear and 4 gear. As the gear of the adjustable wastewater valve 53 increases, the adjustable wastewater valve 53 adjusts the drainage flow of the wastewater outlet pipe 4 to be smaller. Optionally, in this embodiment, when it is detected that the water quality of the water purifier for water production is lower than the preset water quality, and when the water purifier is performing normal water production, the gear of the adjustable wastewater valve 53 is 1 gear; when it is detected that the water quality of the water purifier for water production is not lower than the preset water quality, and when the water purifier is performing normal water production, the gear of the adjustable wastewater valve 53 is 2 gear; when the water purifier is working in the first reflux mode, the gear of the adjustable wastewater valve 53 is 3 gear, and when the water purifier is working in the second reflux mode, the gear of the adjustable wastewater valve 53 is 4 gear.

[0076] Embodiment 3

[0077] The water purifier and water purification method provided in this embodiment are basically the same as those in the first embodiment. The water purifier and water purification method provided in this embodiment are different from those in the first embodiment in that:

[0078] In this embodiment, the regulating valve assembly 5 includes an adjustable wastewater valve 53, which is arranged on the wastewater outlet pipe 4, and the adjustable wastewater valve 53 is configured to steplessly adjust the drainage flow of the wastewater outlet pipe 4. By designing the regulating valve assembly 5 in the form of an adjustable wastewater valve 53, the structure is simple and the adjustment is more flexible and convenient. It should be noted that the specific structure and working principle of the adjustable wastewater valve 53 for steplessly adjusting the drainage flow of the wastewater outlet pipe 4 belong to the prior art and will not be repeated here.

[0079] Alternatively, if Figure 5 As shown, in the water purification method provided by this embodiment, when the water purifier starts the backflow water flushing mode and adjusts the drainage flow of the wastewater outlet pipe 4 through the regulating valve assembly 5, the regulating valve assembly 5 gradually reduces the drainage flow of the wastewater outlet pipe 4 until the regulating valve assembly 5 is closed. The above arrangement enables the reflux amount of pure water in the pure water reflux pipeline 6 to gradually increase when the water purifier starts the backflow water flushing mode, effectively improving the flushing effect of the reverse osmosis filter element 2.

[0080] Optionally, in this embodiment, when the water purifier starts the backflow water flushing mode, the initial detection value of the first TDS detection component 8 is TSD1. At this time, the adjustable waste water valve 53 adjusts the drainage flow rate of the wastewater outlet pipe 4 to the first flow rate. As the backflow water flushing mode proceeds, when the current detection value TSD2 of the first TDS detection component 8 is less than 10% TSD1, the adjustable waste water valve 53 reduces the drainage flow rate of the wastewater outlet pipe 4. As the backflow water flushing mode proceeds, when the current detection value TSD3 of the first TDS detection component 8 is less than 10% TSD2, the adjustable waste water valve 53 further reduces the drainage flow rate of the wastewater outlet pipe 4 until the adjustable waste water valve 53 is in a closed state during the process of being adjusted down, and the backflow water flushing mode stops.

[0081] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A water purifier, characterized in that: include: A water inlet pipeline (1), the inlet of the water inlet pipeline (1) being used to communicate with a raw water supply end, and the water inlet pipeline (1) being provided with a booster pump (11) and a first control valve (12); A reverse osmosis filter element (2), wherein a raw water inlet of the reverse osmosis filter element (2) is connected to an outlet of the water inlet pipeline (1); A pure water outlet pipe (3) connected to the pure water outlet of the reverse osmosis filter element (2); A wastewater outlet pipe (4) connected to the concentrated water outlet of the reverse osmosis filter element (2); A pure water return pipeline (6), wherein the water inlet of the pure water return pipeline (6) is connected to the pure water outlet pipe (3), and the water outlet of the pure water return pipeline (6) is connected to the water inlet pipeline (1), and the pure water return pipeline (6) can return part of the pure water in the pure water outlet pipe (3) to the water inlet pipeline (1); A regulating valve assembly (5) is arranged on the wastewater outlet pipe (4), and the regulating valve assembly (5) is configured to regulate the drainage flow of the wastewater outlet pipe (4), and the drainage flow of the wastewater outlet pipe (4) is regulated by the regulating valve assembly (5), thereby regulating the flow of pure water returning in the pure water return pipeline (6).

2. The water purifier according to claim 1, characterized in that: The regulating valve assembly (5) comprises a first wastewater valve (51) and a second wastewater valve (52), wherein the first wastewater valve (51) and the second wastewater valve (52) are connected in series to the wastewater outlet pipe (4).

3. The water purifier according to claim 1, characterized in that: The regulating valve assembly (5) comprises an adjustable wastewater valve (53), which is arranged on the wastewater outlet pipe (4), and is configured to steplessly adjust the drainage flow of the wastewater outlet pipe (4) or to steplessly adjust the drainage flow of the wastewater outlet pipe (4) in multiple gears.

4. The water purifier according to claim 1, characterized in that: The water purifier also includes: A post-filter element is connected to the pure water outlet pipe (3), and along the flow direction of water in the pure water outlet pipe (3), the connection point between the water inlet of the pure water return pipeline (6) and the pure water outlet pipe (3) is located downstream of the post-filter element.

5. The water purifier according to any one of claims 1 to 4, characterized in that: The water purifier also includes: A first TDS detection component (8) is communicatively connected to the regulating valve assembly (5); the first TDS detection component (8) is arranged on the water inlet pipeline (1); the first TDS detection component (8) is configured to detect the TDS value of water in the water inlet pipeline (1); and the regulating valve assembly (5) is capable of adjusting the drainage flow of the wastewater outlet pipe (4) according to the detection value of the first TDS detection component (8).

6. A water purification method, characterized in that: Applicable to the water purifier according to any one of claims 1 to 5, the water purification method comprises the following steps: The water purifier starts a backflow water flushing mode; When the water purifier starts the reflux water-making and flushing mode, the reverse osmosis filter element (2) performs water-making work, the pure water reflux pipeline (6) refluxes part of the pure water in the pure water outlet pipe (3) to the water inlet pipe (1), and adjusts the drainage flow of the waste water outlet pipe (4) through the regulating valve assembly (5), thereby adjusting the flow of the pure water refluxed in the pure water reflux pipeline (6).

7. The water purification method according to claim 6, characterized in that: The backflow water flushing mode comprises a first backflow mode and a second backflow mode, the water purifier first operates in the first backflow mode, and when it is detected that the TDS value of the water in the water inlet pipeline (1) before entering the reverse osmosis filter element (2) is less than a first preset value, the water purifier operates in the second backflow mode, and when it is detected that the TDS value of the water in the water inlet pipeline (1) before entering the reverse osmosis filter element (2) is less than the second preset value, the backflow water flushing mode stops; Wherein, when the water purifier operates in the first reflux mode, the regulating valve assembly (5) adjusts the drainage flow of the wastewater outlet pipe (4) to a first preset flow; when the water purifier operates in the second reflux mode, the regulating valve assembly (5) adjusts the drainage flow of the wastewater outlet pipe (4) to a second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value.

8. The water purification method according to claim 7, characterized in that: Before the water purifier starts the backflow water flushing mode, the TDS value of the water in the water inlet pipeline (1) before entering the reverse osmosis filter element (2) is TSD 初始 , then the first preset value is aTSD 初始 The second preset value is bTSD 初始 , and a>b.

9. The water purification method according to claim 6, characterized in that: The backflow water flushing mode comprises a first backflow mode and a second backflow mode. When it is detected that the water quality of the water produced by the water purifier is lower than a preset water quality and when the water purifier starts the backflow water flushing mode, the water purifier first operates in the first backflow mode. When it is detected that the TDS value of the water in the water inlet pipeline (1) before entering the reverse osmosis filter element (2) is less than a first preset value, the water purifier operates in the second backflow mode. When it is detected that the TDS value of the water in the water inlet pipeline (1) before entering the reverse osmosis filter element (2) is less than a second preset value, the backflow water flushing mode is stopped. When it is detected that the water quality of the water produced by the water purifier is not lower than the preset water quality, and when the water purifier starts the backflow water production and flushing mode, the water purifier directly operates in the second backflow mode, and when it is detected that the TDS value of the water in the water inlet pipeline (1) before entering the reverse osmosis filter element (2) is less than the second preset value, the backflow water production and flushing mode is stopped; Wherein, when the water purifier operates in the first reflux mode, the regulating valve assembly (5) adjusts the drainage flow of the wastewater outlet pipe (4) to a first preset flow; when the water purifier operates in the second reflux mode, the regulating valve assembly (5) adjusts the drainage flow of the wastewater outlet pipe (4) to a second preset flow, and the first preset flow is greater than the second preset flow, and the first preset value is greater than the second preset value.

10. The water purification method according to claim 6, characterized in that: When the water purifier starts the backflow water flushing mode and adjusts the drainage flow of the wastewater outlet pipe (4) through the regulating valve assembly (5), the regulating valve assembly (5) gradually reduces the drainage flow of the wastewater outlet pipe (4) until the regulating valve assembly (5) is closed.

11. The water purification method according to any one of claims 6 to 10, characterized in that: Before the water purifier starts the backflow water production and flushing mode, the water purifier starts the flushing mode. When the water purifier starts the flushing mode, the reverse osmosis filter element (2) stops producing water, the regulating valve assembly (5) adjusts the drainage flow of the wastewater outlet pipe (4) to the maximum, and the raw water in the water inlet pipeline (1) is discharged through the reverse osmosis filter element (2) and the wastewater outlet pipe (4) in turn. When the water purifier starts the flushing mode for a first preset time, the water purifier starts the backflow water production and flushing mode.

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