Water purification system and its water production control method

Abstract

The present invention relates to the field of water purification technology, and discloses a water purification system and a water production control method thereof. The system includes a water production pipeline, a circulating flushing pipeline, a reverse flushing pipeline, and a control valve group. A pre-filter, a post-filter, a pure water storage device, and a heating device are connected in series in the water production pipeline; the circulating flushing pipeline is connected in parallel to the water production pipeline and is suitable for circulating and flushing the pre-filter; the reverse flushing pipeline is sequentially connected to the heating device and the post-filter and is suitable for reverse flushing the post-filter; the control valve group is suitable for switching and controlling the flow of the water production pipeline or controlling the flow of the reverse flushing pipeline and / or controlling the flow of the circulating flushing pipeline. The present invention performs forward hot water circulation flushing on the pre-filter and reverse hot water flushing on the post-filter, which not only has the effect of flushing, but also the hot water can break the balance between the carbon and the adsorbed pollutants, so that the pollutants are desorbed and desorbed, thereby restoring part of the adsorption capacity of the carbon filter and realizing regeneration. At the same time, it is also relatively safe and simple.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and particularly to a water purification system and a water production control method thereof. Background Art

[0002] During the process of pipeline transportation, tap water will inevitably be contaminated by rust, sediment, organic matter, microorganisms, etc. With people's attention to water quality safety, water purifiers with purification functions have gradually been accepted by the market. The water purification system of a water purifier usually includes a pretreatment filter element, a precision filter element, and a post-treatment filter element. Among them, the pretreatment filter element is used to remove organic matter, colloid, heavy metals, sediment particles, etc.; the precision filter element has extremely high precision, such as an RO membrane filter element, which is the core treatment filter element of the water purification system; the post-treatment filter element is used to remove trace elements, adjust the pH, and drinking taste, etc.

[0003] Because the carbon filter element can effectively adsorb impurities and remove oxidizing substances such as residual chlorine, it is an indispensable important component in the pretreatment filter element and the post-treatment filter element of the water purifier. During the long-term operation of the carbon filter element, bacteria may grow on its surface and a biofilm may be formed, resulting in a decline in water purification performance and even possible contamination of the purified water, affecting the service life of the carbon filter element. Most of the pretreatment filter elements and post-treatment filter elements in the existing water purification systems are disposable consumables, which are directly discarded and replaced when their service life expires. This not only causes huge waste and environmental pollution, but also brings troubles to users and increases the use cost due to the frequent replacement of the carbon filter element. Summary of the Invention

[0004] In view of this, the present invention provides a water purification system and a water production control method thereof to solve the problems of short filter element life and frequent replacement in the prior art.

[0005] In a first aspect, the present invention provides a water purification system, including:

[0006] A water production pipeline, in which a pre-filter element, a post-filter element, a pure water storage device, and a heating device are sequentially connected in series;

[0007] Wherein, along the water flow direction in the water production pipeline, the pre-filter element is sequentially provided with a pre-inlet and a pre-outlet, the post-filter element is sequentially provided with a post-inlet and a post-outlet, the heating device is communicated with the pure water storage device and is adapted to selectively heat the pure water in the pure water storage device. Both the pre-filter element and the post-filter element include a carbon water purification unit;

[0008] A circulating flushing pipeline, which is connected in parallel to the water production pipeline. The inlet end of the circulating flushing pipeline is communicated with the pre-outlet, and the outlet end is communicated with the pre-inlet, and is adapted to flush the pre-filter element in a forward direction with hot water;

[0009] The reverse flushing pipeline, along the water flow direction in the reverse flushing pipeline, is sequentially connected to a heating device, a rear water outlet, a rear filter element, and a rear water inlet, and is suitable for reverse flushing the rear filter element with hot water;

[0010] The control valve group is arranged on the water production pipeline, the circulating flushing pipeline, and the reverse flushing pipeline, and is suitable for switching and controlling the water production pipeline to flow or controlling the reverse flushing pipeline and / or controlling the circulating flushing pipeline to flow.

[0011] Beneficial effects: When the water purification system starts the regeneration mode, the control valve group can conduct the water production pipeline located upstream of the pre-filter element to supply a set amount of flushing water to the pre-filter element. Then, the control valve group closes the water production pipeline, conducts the circulating flushing pipeline, and drives the flushing water in the circulating flushing pipeline to circulate, thereby realizing the forward circulating flushing of the pre-filter element, effectively regenerating the activated carbon, increasing the service life of the pre-filter element, and avoiding the trouble caused by frequent filter element replacement and the increase in usage cost. By flushing the pre-filter element and the rear filter element with hot water, the present invention not only has the effect of flushing, but also the hot water can break the balance between the carbon and the adsorbed pollutants, desorb the pollutants, so that the carbon filter element can recover part of its adsorption capacity and realize regeneration, and it is also relatively safe and simple. In addition, through the arranged circulating flushing pipeline, the pre-filter element can be circulated and flushed, and the flushing water can be recycled, saving water resources and avoiding waste of resources.

[0012] In addition, when the water purification system starts the regeneration mode, the control valve group can also conduct the reverse flushing pipeline, so that the hot water in the heating device enters the rear filter element, thereby enabling the rear filter element to be reversely flushed. The attachments on the rear filter element can be effectively peeled off and removed in the reverse hot water flow, realizing the effective regeneration of the rear filter element, increasing the service life of the filter element, and avoiding frequent replacement of the filter element.

[0013] In an optional embodiment, the reverse flushing pipeline includes a water inlet section communicating between the hot water outlet of the heating device and the rear water outlet, and a drain pipe section communicating with the rear water inlet. The control valve group includes:

[0014] A first switching valve, suitable for switching the connection between the pure water storage device or the water inlet section and the rear water outlet;

[0015] A second switching valve, suitable for switching the connection between the water production pipeline or the drain pipe section and the rear water inlet.

[0016] Beneficial effects: By means of the first switching valve, the communication between the rear water outlet and the pure water storage device, or the communication between the rear water outlet and the water inlet section of the reverse flushing pipeline is switched. By means of the second switching valve, the communication between the water production pipeline and the rear water inlet, or the communication between the rear water inlet and the drain pipe section is switched to complete the reverse flushing of the rear filter element. By flushing the impurities and dirt attached to the rear filter element in a direction opposite to the water flow direction during normal water production, these impurities and dirt can be more easily peeled off, the impurity removal effect is better, and the regeneration of the activated carbon is realized. By providing the first switching valve and the second switching valve, the direction of the water flow can be switched, and the two-way flow of the water flow in the rear filter element can be realized, so that the water production mode and the reverse flushing mode of the rear filter element do not affect each other, and the structure is simple, reliable and easy to implement.

[0017] In an optional embodiment, both the first switching valve and the second switching valve are two-way valves. The two-way valve has three valve ports. Two valve ports of the two-way valve are respectively connected to the water production pipeline, and the other valve port of the two-way valve is connected to the reverse flushing pipeline.

[0018] Beneficial effects: By opening or closing the two-way valve, the switching between the water production pipeline and the reverse flushing pipeline is completed, or the switching between hot water flushing and normal temperature flushing is completed. It is easier to realize the switching between the normal water production mode and the reverse flushing mode, and the structure is simpler, more reliable and the pipeline is simplified.

[0019] In an optional embodiment, the water production pipeline includes:

[0020] The first pipeline, one end of which is communicated with the tap water port and the other end is communicated with the front water inlet;

[0021] The second pipeline, one end of which is communicated with the front water outlet and the other end is communicated with the water inlet of the rear filter element;

[0022] The third pipeline, one end of which is communicated with the rear water outlet and the other end is communicated with the water inlet of the pure water storage device;

[0023] Wherein, one end of the drain pipe section of the reverse flushing pipeline is connected to the second pipeline through the first switching valve, and the other end is communicated with the external drainage system;

[0024] One end of the water inlet section of the reverse flushing pipeline is connected to the hot water outlet of the heating device, and the other end is connected to the third pipeline through the second switching valve.

[0025] Beneficial effects: Through the above pipeline design, it is possible to realize the switching of the water purification system between normal water production, hot water reverse flushing of the rear filter element, and normal temperature water reverse cooling of the rear filter element by means of the first switching valve and the second switching valve.

[0026] In an optional embodiment, the control valve group further includes:

[0027] The first switching valve is arranged on the first pipeline and is adapted to control the on-off of the water path between the tap water port and the pre-filter.

[0028] The second switching valve is arranged on the second pipeline and is adapted to control the on-off of the water path between the pre-filter and the post-filter.

[0029] Beneficial effects: The first switching valve can control whether the water inlet mechanism of the water purification system supplies tap water to the pre-filter. In the regeneration mode, especially in the regeneration mode of the pre-filter, the first switching valve can close the first pipeline to prevent the flushing water in the circulating flushing pipeline from flowing back to the tap water port. The second switching valve can control the on-off of the water path between the pre-filter and the post-filter. In the normal water production mode, the second pipeline is opened and conducted. When the regeneration mode of the pre-filter is started, the second switching valve can close the second pipeline to prevent the circulating flushing water from flowing into the next-stage filter element, so that the pre-filter cannot be circulated and flushed, or the performance of the next-stage filter element is damaged.

[0030] In an optional embodiment, the water purification system further includes:

[0031] The precision filter element is connected in series on the second pipeline, and the second switching valve is arranged on the second pipeline between the pre-filter and the precision filter element;

[0032] The first switching valve is arranged on the second pipeline between the precision filter element and the post-filter and is adapted to switch the connection between the precision filter element or the drain pipe section and the post-inlet.

[0033] Beneficial effects: All impurity molecules except water molecules can be filtered out by the precision filter element, but the precision filter element is not resistant to high temperature. The hot water for realizing the regeneration of the filter element needs to avoid this stage of the filter element. Therefore, a second switching valve is arranged between the pre-filter and the precision filter element. During normal water production, the second switching valve can be opened to allow the water filtered by the pre-filter to enter the precision filter element for further purification. When the pre-filter is regenerated, the inlet valve is closed to prevent the hot water flowing out of the outlet of the pre-filter from entering the precision filter element.

[0034] In an optional embodiment, a heating unit is arranged on the circulating flushing pipeline and / or inside the pre-filter, and the heating unit is used to heat the flushing water of the pre-filter.

[0035] Beneficial effects: The heating unit can heat the flushing water, making the flushing water become hot water. By flushing or soaking the pre-filter with hot water, the impurities and dirt attached to the pre-filter can be more easily peeled off and removed, thereby realizing the effective regeneration of the activated carbon in the pre-filter and further improving the removal effect of the impurities attached to the pre-filter. In addition, the pre-filter realizes flushing and regeneration by using an independent heating unit, which is only started in the pre-filter regeneration mode, facilitating the separate and independent operation of the thermal regeneration of the pre-filter and the thermal regeneration of the post-filter, and having higher flexibility in use.

[0036] In an optional embodiment, a one-way valve is provided on the circulating flushing pipeline, and the one-way valve is used to make the water flow unidirectionally from the inlet end of the circulating flushing pipeline to the outlet end of the circulating flushing pipeline.

[0037] Beneficial effects: The one-way valve is not controlled by a program and is used to limit the water flow direction of the circulating flushing pipeline, preventing it from flowing reversely, thereby effectively avoiding the backflow of water in the circulating flushing pipeline or the water in the water production pipeline flowing into the circulating flushing pipeline during the water production process.

[0038] In an optional embodiment, a water flow driving member is provided on the circulating flushing pipeline or the water production pipeline, and the water flow driving member is adapted to drive the flushing water in the circulating flushing pipeline to circulate and flow forward to flush the pre-filter.

[0039] Beneficial effects: By setting the water flow driving member to drive the flushing water in the circulating flushing pipeline to circulate and flow, the pre-filter can be circulated and flushed, thereby realizing the effective regeneration of the activated carbon, improving the service life of the pre-filter, and avoiding the trouble caused by frequent filter element replacement and the problem of increased use cost.

[0040] In an optional embodiment, a flushing water discharge pipeline adapted to communicate with an external drainage system branches out from the circulating flushing pipeline;

[0041] The control valve group further includes:

[0042] A third switching valve, provided on the flushing water discharge pipeline, for controlling the on-off of the flushing water discharge pipeline.

[0043] Beneficial effects: By providing the flushing water discharge pipeline and the third switching valve, not only can the flushing water be discharged and the flushing water in the pre-filter be replaced, but also the pre-filter can be cooled. After the cooling mode, there is no hot water in the pre-filter, which can avoid damage to the precision filter caused by the hot water flowing to the precision filter during normal water production.

[0044] In a second aspect, the present invention also provides a water production control method for a water purification system, applicable to the water purification system of any of the above embodiments. The water purification system has a regeneration mode, and the control method includes:

[0045] Receive an instruction to start the regeneration mode;

[0046] The control valve group conducts the water supply pipeline, sends flushing water to the pre-filter element, then closes the water supply pipeline, conducts the circulating flushing pipeline, and circulates the flushed water forward into the pre-filter element to circulate and flush the pre-filter element;

[0047] And / or, the control valve group conducts the reverse flushing pipeline, and reversely passes the hot water in the heating device into the post-filter element for hot water flushing.

[0048] In an optional implementation manner, after the water purification system receives the instruction to start the regeneration mode, the following steps are further executed;

[0049] Control the heating unit in the circulating flushing pipeline and / or in the pre-filter element to start, heat the flushing water, so as to circulate and flush the pre-filter element with hot water.

[0050] In an optional implementation manner, after the thermal regeneration mode of the pre-filter element and / or the post-filter element ends, enter the cooling mode, which specifically includes the following steps:

[0051] Control the first switching valve and the third switching valve to open, the heating unit to close, and the water flow driving member to start, and pass the normal temperature cooling water entering from the tap water inlet into the pre-filter element, cool the pre-filter element and discharge it through the flushing water discharge pipeline;

[0052] And / or, control the normal temperature water in the pure water storage device to be reversely passed into the post-filter element for cooling, and the normal temperature cooling waste water is discharged through the flushing water discharge pipeline.

[0053] In an optional implementation manner, control the thermal regeneration mode and the cooling mode to alternate.

[0054] In an optional implementation manner, the regeneration mode further includes a soaking step, which specifically includes the following steps:

[0055] Control the water flow driving member to close, and soak the pre-filter element with the hot water heated by the heating unit; and / or, control the third switching valve to close, and soak the post-filter element with the hot water in the heating device.

[0056] In an optional implementation manner, during the thermal regeneration mode, the temperature of the flushing water for the pre-filter element and / or the post-filter element is greater than the ambient temperature and less than the boiling point of water. Description of the Drawings

[0057] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0058] Figure 1 It is a schematic diagram of the principle when the purification system flushes the pre-filter in the forward direction and the heating component is externally disposed of the pre-filter in the embodiment of the present invention;

[0059] Figure 2 It is a schematic diagram of the principle when the purification system flushes the pre-filter in the forward direction and the heating component is internally disposed of the pre-filter in the embodiment of the present invention;

[0060] Figure 3 For Figure 1 It is a schematic diagram of the water flow direction when the purification system in

[0061] Figure 4 For Figure 1 It is a schematic diagram of the water flow direction when the purification system in

[0062] Figure 5 For Figure 1 It is a schematic diagram of the water flow direction when the purification system in

[0063] Explanation of reference numerals:

[0064] 100, tap water inlet; 200, water intake;

[0065] 10, pre-filter;

[0066] 101, first pipeline; 1011, first switching valve; 1012, first water port; 1013, water flow driving part; 1014, heating unit;

[0067] 11, circulating flushing pipeline; 110, one-way valve; 111, flushing water discharge pipeline; 1111, third switching valve;

[0068] 12, reverse flushing pipeline; 120, second switching valve; 121, drain pipe section; 122, water inlet pipe section;

[0069] 20, precision filter; 201, concentrated water pipeline; 2011, waste water switching valve;

[0070] 30, post-filter; 301, second pipeline; 3011, first switching valve; 3012, second switching valve;

[0071] 40, pure water storage device; 401, third pipeline

[0072] 50. Heating device; 501. Fourth pipeline;

[0073] 60. Coarse filter element. Detailed implementation manners

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0075] To achieve the goals of long service life and less frequent filter element replacement for the water purification filter element, the industry mainly extends the service life of the carbon filter element by improving the carbon material, manufacturing process, and increasing the carbon dosage, which can all improve the water purification performance and service life to a certain extent, but there are always failure points. It is necessary to find a breakthrough to improve the service life of the carbon filter element.

[0076] Through research, the process of activated carbon adsorbing pollutants mainly includes physical adsorption and chemical adsorption. Physical adsorption is the main adsorption process that occurs in activated carbon. Changing conditions can break the adsorption equilibrium and cause the adsorbate to desorb. The chemical adsorption process is irreversible and essentially involves the formation of a stable complex between the functional groups on the surface of activated carbon and pollutant molecules. In the specific process, activated carbon mainly relies on physical adsorption first. When physical adsorption approaches saturation, chemical adsorption intervenes and directly leads to complete failure. In view of the above characteristics, finding a way to break the balance between activated carbon and the adsorbate, making physical adsorption proceed in the reverse direction, and at the same time slowing down the reaction process of chemical adsorption to regenerate activated carbon and restore its adsorption capacity can achieve the purpose of extending the service life.

[0077] Therefore, it is necessary to find a more effective general technology for the service life of the carbon filter element to solve the problems of short service life and frequent filter element replacement of the activated carbon filter, improve the service life of the carbon filter element, and at the same time meet the requirements of energy conservation and environmental protection and enhance the competitiveness of products.

[0078] The following combines Figures 1 to 5 , and describes the embodiments of the present invention.

[0079] According to an embodiment of the present invention, on the one hand, the present invention provides a water purification system, which includes: a water production pipeline, a circulating flushing pipeline 11, a reverse flushing pipeline 12, and a control valve group.

[0080] Specifically, as Figure 1 and Figure 2As shown, a pre-filter 10, a post-filter 30, a pure water storage device 40, and a heating device 50 are connected in series in sequence on the water production pipeline. Among them, along the water flow direction in the water production pipeline, the pre-filter 10 is sequentially provided with a pre-inlet and a pre-outlet, the post-filter 30 is sequentially provided with a post-inlet and a post-outlet, and the heating device 50 is communicated with the pure water storage device 40 and is adapted to selectively heat the pure water in the pure water storage device 40. Both the pre-filter 10 and the post-filter 30 include a carbon water purification unit. A circulating flushing pipeline 11 is arranged in parallel on the water production pipeline. The inlet end of the circulating flushing pipeline 11 is communicated with the pre-outlet, and the outlet end is communicated with the pre-inlet, and is adapted to perform a forward circulating flushing of the pre-filter 10 through hot water. Along the water flow direction in the reverse flushing pipeline 12, the reverse flushing pipeline 12 is sequentially connected to the heating device 50, the post-outlet, the post-filter 30, and the post-inlet, and is adapted to perform a reverse flushing of the post-filter 30 through hot water. A control valve group is arranged on the water production pipeline, the circulating flushing pipeline 11, and the reverse flushing pipeline 12, and is adapted to switch and control the circulation of the water production pipeline or control the circulation of the reverse flushing pipeline 12 and / or control the circulation of the circulating flushing pipeline 11.

[0081] In the above embodiment, the water flow direction during water production is forward. When the circulating flushing pipeline 11 is in circulation, the flushing water that enters the pre-filter 10 from the tap water port circulates in the circulating flushing pipeline 11 and circulates into the pre-filter 10 from the pre-inlet to realize the forward circulating flushing of the pre-filter 10. When the reverse flushing pipeline 12 is in circulation, the hot water in the heating device 50 enters the post-filter 30 reversely from the post-outlet and is discharged from the post-inlet, realizing the reverse flushing of the post-filter 30 by using the hot water of the heating device 50.

[0082] It should be noted that in this embodiment, the hot water used for flushing and regenerating the pre-filter 10 and the post-filter 30 is warm hot water with a temperature between the ambient temperature and the boiling point of water.

[0083] As Figure 1 and Figure 3 shown, when the water purification system is producing water normally, tap water flows forward along the water production pipeline for water production. After being used for a period of time, more impurities may be adsorbed on the pre-filter 10 and the post-filter 30. By switching the water purification system to the regeneration mode, the pre-filter 10 and the post-filter 30 can be flushed and regenerated. As Figure 1 and Figure 4As shown, when the water purification system starts the regeneration mode, the control valve group can conduct the water supply pipeline located upstream of the pre-filter 10 to supply a set amount of flushing water to the pre-filter 10. Then, the control valve group closes the water supply pipeline and conducts the circulating flushing pipeline 11, and drives the flushing water in the circulating flushing pipeline 11 to circulate, so as to realize the forward circulating flushing of the pre-filter 10, thereby realizing the effective regeneration of the activated carbon, improving the service life of the pre-filter 10, and avoiding the trouble caused by frequent filter element replacement and the problem of increased use cost.

[0084] In addition, through the set circulating flushing pipeline 11, the pre-filter 10 can be circulated and flushed, and the flushing water can also be recycled, saving water resources and avoiding the waste of resources. When the water purification system starts the regeneration mode, the control valve group can also conduct the reverse flushing pipeline 12, so that the hot water in the heating device 50 enters the post-filter 30, so that the post-filter 30 can be reversely flushed. The attachments on the post-filter 30 can be effectively peeled off and removed in the reverse hot water flow, realizing the effective regeneration of the post-filter 30, improving the service life of the filter element, and avoiding frequent replacement of the filter element.

[0085] The core point of the water purification system provided in this embodiment is the application of the thermal regeneration technology to the filter element of the water purifier. The beneficial effect is to extend the service life of the carbon filter element and the filter element replacement cycle. The filter element in action is the carbon filter element, which is not limited to various forms. The carbon-containing water purification filter element unit is the object of the thermal regeneration technology. Optionally, both the pre-filter 10 and the post-filter 30 are activated carbon filter elements.

[0086] The medium for realizing the thermal regeneration mode is hot water, and the temperature is between the ambient temperature and the boiling point of water. By flushing the pre-filter 10 and the post-filter 30 with hot water, not only the flushing effect is achieved, but also the hot water can break the balance between the carbon and the adsorbed pollutants, so that the pollutants are desorbed and the carbon filter element can recover part of its adsorption capacity, realizing regeneration, and at the same time it is relatively safe and simple.

[0087] The water purification system provided in this embodiment can flush the pre-filter 10 forward and the post-filter 30 backward, extend the service lives of the pre-filter 10 and the post-filter 30, and do not need to be replaced frequently. Compared with the related technology, the cost is lower, and it can effectively avoid the problem of potential water safety hazards caused by the chemical regeneration method, ensuring water safety.

[0088] In some embodiments, the backwashing pipeline 12 includes a water inlet pipe section 122 connected between the hot water outlet of the heating device 50 and the rear water outlet, and a drain pipe section 121 connected to the rear water inlet. The control valve group includes a first switching valve 3011 and a second switching valve 120. The first switching valve 3011 is adapted to switch the connection between the pure water storage device 40 or the water inlet pipe section 122 and the rear water outlet; the second switching valve 120 is adapted to switch the connection between the water production pipeline or the drain pipe section 121 and the rear water inlet.

[0089] In the above embodiments, the first switching valve 3011 is used to switch the connection between the rear water outlet and the pure water storage device 40, or the connection between the rear water outlet and the water inlet pipe section 122 of the backwashing pipeline 12. The second switching valve 120 is used to switch the connection between the water production pipeline and the rear water inlet, or the connection between the rear water inlet and the drain pipe section 121, so as to complete the backwashing of the rear filter element 30. By flushing the impurities and dirt attached to the rear filter element 30 in a direction opposite to the water flow direction during normal water production, these impurities and dirt can be more easily peeled off, and the impurity removal effect is better, realizing the regeneration of the activated carbon. By providing the first switching valve 3011 and the second switching valve 120, the direction of the water flow can be switched, realizing the two-way flow of the water in the rear filter element 30, so that the water production mode and the backwashing mode of the rear filter element 30 do not affect each other, and the structure is simple, reliable and easy to implement.

[0090] In some more specific embodiments, both the first switching valve 3011 and the second switching valve 120 are two-way valves. The two-way valve has three valve ports. Two valve ports of the two-way valve are respectively connected to the water production pipeline, and the other valve port of the two-way valve is connected to the backwashing pipeline 12.

[0091] In the above embodiments, by opening or closing the two-way valve, the switching between the water production pipeline and the backwashing pipeline 12 is completed, or the switching between hot water flushing and normal temperature flushing is completed, which is easier to realize the switching between the normal water production mode and the backwashing mode, and the structure is simpler, more reliable and simplifies the pipeline.

[0092] In some variant embodiments, the first switching valve 3011 and the second switching valve 120 can also adopt existing three-way valves.

[0093] It should be noted that the control valve group is not limited to on-off valves and two-way valves, as long as each mode of operation can be realized.

[0094] In some embodiments, the water production pipeline includes a first pipeline 101, a second pipeline 301, and a third pipeline 401. Specifically, one end of the first pipeline 101 is connected to the tap water port, and the other end is connected to the pre-filter inlet; one end of the second pipeline 301 is connected to the pre-filter outlet, and the other end is connected to the inlet of the post-filter 30; one end of the third pipeline 401 is connected to the post-filter outlet, and the other end is connected to the inlet of the pure water storage device 40; wherein, one end of the drain pipe section 121 of the reverse flushing pipeline 12 is connected to the second pipeline 301 through a first switching valve 3011, and the other end is connected to the external drainage system; one end of the water inlet pipe section 122 of the reverse flushing pipeline 12 is connected to the hot water outlet of the heating device 50, and the other end is connected to the third pipeline 401 through a second switching valve 120.

[0095] Through the above pipeline design, it is possible to control the water purification system to switch between normal water production, reverse hot water flushing of the post-filter 30 with hot water, and reverse cooling of the post-filter 30 with normal temperature water by means of the first switching valve 3011 and the second switching valve 120.

[0096] Furthermore, in the above embodiments, the first switching valve 3011 is provided on the second pipeline 301, and its two valve ports are respectively connected to the second pipeline 301, and the other valve port is connected to the drain pipe section 121. The first switching valve 3011 has a first state in which the second pipeline 301 and the post-filter inlet of the post-filter 30 are conducted, and a second state in which the inlet end of the drain pipe section 121 and the post-filter inlet of the post-filter 30 are conducted. The first switching valve 3011 is adapted to switch between the first state and the second state. The second switching valve 120 is provided on the third pipeline 401, and its two valve ports are respectively connected to the third pipeline 401, and the other valve port is connected to the water inlet pipe section 122 of the reverse flushing pipeline 12. The second switching valve 120 has a third state in which the post-filter outlet of the post-filter 30 and the pure water storage device 40 are conducted, and a fourth state in which the water inlet pipe section 122 of the reverse flushing pipeline 12 and the post-filter outlet of the post-filter 30 are conducted. The second switching valve 120 is adapted to switch between the third state and the fourth state.

[0097] Among them, as Figure 3 shown, when the first switching valve 3011 switches to the first state and the second switching valve 120 switches to the third state, normal water production can be achieved. When the first switching valve 3011 switches to the second state and the second switching valve 120 switches to the fourth state, the hot water in the heating device 50 can flow reversely into the post-filter 30, so that the post-filter 30 can be reversely flushed with hot water to realize filter regeneration. For details, see Figure 4 shown. When the first switching valve 3011 switches to the second state and the second switching valve 120 switches to the third state, through pressurization or suction by a pressure pump, the normal temperature water in the pure water storage device 40 can flow reversely into the post-filter 30 to realize reverse cooling flushing of the post-filter 30.

[0098] In this embodiment, the water source used for regeneration and cooling of the post-filter element 30 is filtered pure water. Since most of the impurities and dirt in the water have been filtered out by the filter elements at various levels upstream of the post-filter element 30 during water production, the impurities in the water are negligible when reaching the post-filter element 30. Therefore, the impurities in the post-filter element 30 are much less than those in the pre-filter element 10. In view of this, this embodiment uses pure water with a higher degree of cleanliness and almost no impurities to rinse the post-filter element 30, avoiding the problem of using tap water as a flushing water source, where the impurities in the tap water will backfire on the post-filter element 30, resulting in the post-filter element 30 not being cleaned properly. In this embodiment, the hot water used for regeneration of the post-filter element 30 and the water intake 200 of the drinking water purification system share a heating device 50, which saves costs and simplifies the structure. The regenerated reverse flushing pipeline 12 is opposite to the water flow direction of the normal water production pipeline, which can realize the reverse flushing regeneration of the post-filter element 30. While the reverse flushing pipeline 12 realizes effective regeneration, it can clear the post-filter element 30 and take away impurities through the recoil force. In the cooling mode, the temperature of the carbon filter element is lowered by the room temperature pure water in the pure water storage device 40 to avoid switching to the normal water production mode. Excessively high water temperature may cause performance damage to the next-level components or affect normal drinking water.

[0099] It should be noted that, in this embodiment, the two-way valves used by the first switching valve 3011 and the second switching valve 120 are one-inlet and two-outlet valves or three-way valves. When opened, the reverse flushing pipeline 12 is connected to the post-filter element 30, and when closed, the water production pipeline is connected to the post-filter element 30. The two-way valve is used to switch the pipeline connection state. The above-mentioned two-way valve has three valve ports. When the two-way valve is closed, the water production pipeline is connected, and normal water production can be achieved. When the two-way valve is opened, the reverse flushing pipeline 12 is connected, and reverse flushing of the post-filter element 30 can be achieved.

[0100] For example, the three valve ports of the two-way valve are the first valve port, the second valve port and the third valve port. The first valve port and the third valve port are connected to the water supply pipeline, and the third valve port is connected to the reverse flushing pipeline 12. When the two-way valve is closed, the first valve port and the third valve port are opened, so that the water supply pipeline is connected; and when the two-way valve is opened, the first valve port and the second valve port are opened, so that the reverse flushing pipeline 12 is connected.

[0101] It should be noted that the pipeline switching valve is not limited to an on-off valve or a two-way valve, and any valve capable of switching between various operation modes is sufficient.

[0102] In some embodiments, the control valve group further includes a first switch valve 1011 and a second switch valve 3012. The first switch valve 1011 is disposed on the first pipeline 101, and is suitable for controlling the waterway between the tap water inlet and the pre-filter element 10; the second switch valve 3012 is disposed on the second pipeline 301, and is suitable for controlling the waterway between the pre-filter element 10 and the post-filter element 30.

[0103] In the above embodiments, the first switching valve 1011 is provided to control whether the water inlet mechanism of the water purification system supplies tap water to the pre-filter 10. In the regeneration mode, especially in the regeneration mode of the pre-filter 10, the first switching valve 1011 can close the first pipeline 101 to prevent the flushing water in the circulation flushing pipeline 11 from flowing back to the tap water port. The second switching valve 3012 is provided to control the on-off of the water path between the pre-filter 10 and the post-filter 30. In the normal water production mode, the second pipeline 301 is opened and conducted. When the regeneration mode of the pre-filter 10 is started, the second switching valve 3012 can close the second pipeline 301 to prevent the circulation flushing water from flowing into the next-stage filter element, so that the pre-filter 10 cannot be circulated and flushed, or the performance of the next-stage filter element is damaged.

[0104] In some embodiments, the water purification system further includes a precision filter element 20, which is connected in series on the second pipeline 301. The second switching valve 3012 is arranged on the second pipeline 301 between the pre-filter 10 and the precision filter element 20; the first switching valve 3011 is arranged on the second pipeline 301 between the precision filter element 20 and the post-filter 30, and is adapted to switch the connection between the precision filter element 20 or the drain pipe section 121 and the post-inlet.

[0105] In the above embodiments, all impurity molecules except water molecules can be filtered out by the precision filter element 20, but the precision filter element 20 is not resistant to high temperature. The hot water for realizing filter element regeneration needs to avoid this stage of filter element. Therefore, a second switching valve 3012 is arranged between the pre-filter 10 and the precision filter element 20. During normal water production, the second switching valve 3012 can be opened to allow the water filtered by the pre-filter 10 to enter the precision filter element 20 for further purification. When the pre-filter 10 is regenerated, the second switching valve 3012 is closed to prevent the hot water flowing out of the outlet of the pre-filter 10 from entering the precision filter element 20.

[0106] Furthermore, the precision filter element 20 has a water inlet, a water outlet and a waste water outlet. Among them, the water inlet of the precision filter element 20 is connected to the outlet of the pre-filter 10 (i.e., the pre-outlet) through the first pipe section of the second pipeline 301. The waste water outlet is connected with a concentrated water pipeline 201, and a waste water switching valve 2011 is arranged on the concentrated water pipeline 201. The water outlet of the precision filter element 20 is connected to the water inlet of the post-filter 30 (i.e., the post-inlet) through the second pipe section of the second pipeline 301. The second switching valve 3012 is arranged on the first pipe section of the second pipeline 301, and the first switching valve 3011 is arranged on the second pipe section of the second pipeline 301. The water outlet of the post-filter 30 (i.e., the post-outlet) is connected to the water inlet of the pure water storage device 40 through a third pipeline 401, and the water outlet of the pure water storage device 40 is connected to the water inlet of the heating device 50 through a fourth pipeline 501.

[0107] Furthermore, the water purification system further includes a coarse filtration filter element 60. The coarse filtration filter element 60 has a water inlet and a water outlet. The water inlet of the coarse filtration filter element 60 is communicated with the tap water inlet 100, and the water outlet of the coarse filtration filter element 60 is connected to the water inlet of the pre-filter element 10 (i.e., the pre-inlet) through a first pipeline 101. Organic matters, residual chlorine, colloids, heavy metals, sediment particles, etc. can be removed through the coarse filtration filter element 60, thereby reducing the impurities entering the pre-filter element 10 and the post-filter element 30, which is beneficial to the regeneration of the pre-filter element 10 and the post-filter element 30.

[0108] In this embodiment, through the above-mentioned filter elements provided in the water purification system, the raw water quality can be purified and made to meet the drinking water standard, and the purified water enters the pure water storage device 40. The pre-filter element 10 and the coarse filtration filter element 60 are used as pretreatment filter elements for removing organic matters, colloids, heavy metals, sediment particles, etc. There are various embodiments. For example, the pretreatment filter element is composed of two filter elements in series, namely a first-stage PP cotton or ultrafiltration and a first-stage pre-activated carbon, or directly a composite filter element in the form of a first-stage PCB, etc. In the attached drawings of this embodiment, it is embodied in the form of two stages in series.

[0109] Furthermore, the precision filter element 20 is a reverse osmosis membrane filter element, mainly composed of a RO membrane, which is the core component of the water purification system and has extremely high purification precision, and can filter out all impurities except water molecules. It should be noted that since the precision filter element 20 is usually not resistant to high temperatures, when the pre-filter element 10 is flushed forward and the post-filter element 30 is flushed backward in this embodiment, the precision filter element 20 must be avoided to prevent damage to the precision filter element 20. The post-filter element 30 can be located before or after the pure water outlet part and is the last-stage purification structure in the water purification system for removing trace elements, adjusting the pH, and the drinking taste, etc.

[0110] In some embodiments, a heating unit 1014 is provided on the circulating flushing pipeline 11 and / or inside the pre-filter element 10, and the heating unit 1014 is used to heat the flushing water.

[0111] In the above embodiment, the heating unit 1014 provided can heat the flushing water to make the flushing water become hot water. By flushing or soaking the pre-filter element 10 with hot water, the impurities and dirt attached to the pre-filter element 10 can be more easily peeled off and removed, thereby realizing the effective regeneration of the activated carbon of the pre-filter element 10 and further improving the removal effect of the impurities attached to the pre-filter element 10. In addition, the pre-filter element 10 realizes flushing and regeneration by adopting an independent heating unit 1014, which is only started in the regeneration mode of the pre-filter element 10, facilitating the separate and independent operation of the thermal regeneration of the pre-filter element 10 and the thermal regeneration of the post-filter element 30, and having higher flexibility in use.

[0112] The specific structure, setting method, working principle, etc. of the heating unit 1014 in the above two implementation manners will be introduced in detail below in conjunction with the accompanying drawings.

[0113] In this embodiment, as Figure 1 , Figure 2 shown, the heating unit 1014 is divided into two implementation manners: built-in and external.

[0114] Specifically, in one implementation manner, as Figure 2 shown, the heating unit 1014 includes a heating component disposed in the membrane housing of the pre-filter 10. The built-in heating component is integrally provided with the membrane housing of the pre-filter 10. When the membrane housing is separated from the inner core, only the inner core can be replaced when replacing the filter element. When the membrane housing and the inner core are integrated, the entire filter element needs to be replaced during replacement.

[0115] In another implementation manner, as Figure 1 shown, the heating unit 1014 includes a heating component disposed on the circulating flushing pipeline 11. The external heating component is independent of the pre-filter 10 and does not affect the replacement of the pre-filter 10.

[0116] Specifically, as Figure 1 shown, the inlet end of the circulating flushing pipeline 11 is directly connected to the water outlet of the pre-filter 10 (i.e., the pre-outlet), or is connected to the second pipeline 301. The outlet end of the circulating flushing pipeline 11 is connected to the first pipeline 101 through the first water port 1012. The first pipeline 101 includes an upstream pipe section located upstream of the first water port 1012 and a downstream pipe section located downstream of the first water port 1012. The first switching valve 1011 is provided on the upstream pipe section of the first pipeline 101, and the heating component is provided on the downstream pipe section of the first pipeline 101. When circulating and flushing the pre-filter 10, the flushing water can flow through the heating component and then enter the pre-filter 10.

[0117] It should be noted that the heating component can be disposed in the pre-filter 10 to heat the flushing water, or can also be disposed on the circulating flushing pipeline 11 to heat the flushing water. This embodiment does not limit this. The heating component is optionally a stainless steel heating pipe, an electric heating wire, etc., and rapidly heats up to the set temperature by generating heat.

[0118] In this embodiment, for the regeneration of the pre-filter 10, tap water is used as the water source for flushing. The flow direction of the circulating flushing pipeline 11 is the same as that of the water supply pipeline during normal water production. By connecting the inlet end of the circulating flushing pipeline 11 to the outlet of the pre-filter 10 and the outlet end of the circulating flushing pipeline 11 to the first pipeline 101, a design is achieved where the activated carbon in the pre-filter 10 is flushed and regenerated in a positive circulation. This enables the contaminants on the activated carbon to be effectively stripped and removed in the flowing water. During flushing, when the heating unit 1014 operates at a low power, the hot water temperature can be effectively guaranteed, and the implementation cost is relatively low.

[0119] In some embodiments, the heating unit 1014 further includes a water temperature detection element for detecting the temperature information of the flushing water; the water temperature detection element and the heating component are respectively connected to the control unit of the water purification system, and the control unit is adapted to control the operation of the heating component according to the temperature information of the flushing water detected by the water temperature detection element.

[0120] Optionally, the water temperature detection element is a temperature sensor. Optionally, the water temperature detection element is arranged inside the pre-filter 10, or on the circulating flushing pipeline 11 or the first pipeline 101. Preferably, the water temperature detection element is arranged on the first pipeline 101 between the downstream of the heating component and the upstream of the water inlet of the pre-filter 10.

[0121] In some embodiments, a one-way valve 110 is arranged on the circulating flushing pipeline 11, and the one-way valve 110 is used to make the water flow unidirectionally from the inlet end of the circulating flushing pipeline 11 to the outlet end of the circulating flushing pipeline 11.

[0122] In the above embodiment, the one-way valve 110 is not controlled by a program and is used to limit the water flow direction of the circulating flushing pipeline 11 so that it cannot flow reversely, thereby effectively avoiding the backflow of water in the circulating flushing pipeline 11 or the water in the water supply pipeline during water production from flowing into the circulating flushing pipeline 11.

[0123] In some embodiments, a water flow driving member 1013 is arranged on the circulating flushing pipeline 11 or the water supply pipeline, and the water flow driving member 1013 is adapted to drive the flushing water in the circulating flushing pipeline 11 to circulate and flow forward to flush the pre-filter 10.

[0124] In the above embodiment, by setting the water flow driving member 1013 to drive the flushing water in the circulating flushing pipeline to circulate, the pre-filter 10 is flushed in a cycle, thereby effectively regenerating the activated carbon, improving the service life of the pre-filter 10, and avoiding the trouble caused by frequent filter element replacement and the increase in usage cost.

[0125] Further, the water flow driving member 1013 is arranged on the first pipeline 101 and downstream of the first water inlet 1012. By arranging the water flow driving member 1013 on the first pipeline 101 between the outlet end of the circulating flushing pipeline 11 and the water inlet of the pre-filter 10, the circulating flushing pipeline 11 can divert the flushing water in front of the water flow driving member 1013, and the same water flow driving member 1013 can be shared in the water production mode and the regeneration mode without separately arranging the water flow driving member 1013, thus saving costs.

[0126] Further, in some more specific embodiments, the water flow driving member 1013 is a booster pump. The booster pump is arranged on the first pipeline 101, so that the booster pump is used for boosting pressure, controlling the opening and closing of the entire water purification system, and serving as the driving force for circulation during disinfection and regeneration. The flushing water discharged from the water outlet of the pre-filter 10 returns to the front of the booster pump through the check valve 110, continues to be heated and circulates.

[0127] Specifically, in the regeneration mode, the downstream pipe section of the first pipeline 101 downstream of the first water inlet 1012 serves as a part of the structure of the circulating flushing pipeline 11, and together with the circulating flushing pipeline 11 and the pre-filter 10 forms a closed loop. The booster pump is used to drive the water to circulate in this closed loop. When starting the regeneration mode, the flushing water is discharged from the water outlet of the pre-filter 10, and under the action of the booster pump, it flows through the circulating flushing pipeline 11, the downstream pipe section of the first pipeline 101, the heating component in sequence, and returns to the pre-filter 10 from the water inlet of the pre-filter 10, and circulates in this way. In the normal water production mode, the downstream pipe section of the first pipeline 101 serves as a part of the structure of the water production pipeline, and the booster pump is used to increase the water pressure to drive the water to flow through the filters at all levels on the water production pipeline in sequence along the water production direction. The setting of the check valve 110 can effectively prevent the water flowing into the first pipeline 101 from flowing into the circulating flushing pipeline 11 during the water production mode.

[0128] In some embodiments, the circulating flushing pipeline 11 branches out a flushing water discharge pipeline 111 adapted to communicate with an external drainage system; the control valve group further includes a third switching valve 1111, and the third switching valve 1111 is arranged on the flushing water discharge pipeline 111 to control the on-off of the flushing water discharge pipeline 111.

[0129] In the above embodiments, by arranging the flushing water discharge pipeline 111 and the third switching valve 1111, not only can the flushing water be discharged and the flushing water in the pre-filter 10 be replaced, but also the pre-filter 10 can be cooled. There is no hot water in the pre-filter 10 after the cooling mode, which can avoid damage to the precision filter 20 caused by the hot water flowing to the precision filter 20 during normal water production.

[0130] Further, in combination with Figure 1 and Figure 5As shown, after the flushing water circulates for a certain period of time, the hot water in the pre-filter 10 can be replaced through the set flushing water discharge pipeline 111 and the third switching valve 1111, so as to prevent the impurities flushed down in the flushing water from backwashing the pre-filter 10 too much. Specifically, when it is necessary to replace the flushing hot water, the first switching valve 1011 and the third switching valve 1111 are controlled to open, the second switching valve 3012 is closed, and the heating unit 1014 continues to operate. The flushing hot water can be discharged through the flushing water discharge pipeline 111 to replace the hot water in the pre-filter 10.

[0131] In this embodiment, the first switching valve 1011, the second switching valve 3012, and the third switching valve 1111 are all solenoid valves.

[0132] Further, in combination with Figure 1 and Figure 5 As shown, the regeneration mode includes a thermal regeneration mode and a cooling mode. The cooling mode is to reduce the temperature of the pre-filter 10 by cooling with normal temperature water, so as to avoid performance damage caused by the excessive temperature of the water entering the next-stage filter element when switching to the normal water production mode. Specifically, after the thermal regeneration mode ends, the cooling mode is carried out. The first switching valve 1011 and the third switching valve 1111 are controlled to open, the second switching valve 3012 is closed, the heating unit 1014 is closed, and normal temperature cooling water is fed into the pre-filter 10. The normal temperature cooling water after flushing is discharged from the flushing water discharge pipeline 111, so as to realize the cooling of the pre-filter 10. After the entire regeneration mode ends, it enters the normal water production mode.

[0133] In some embodiments, the circulating flushing pipeline 11 in this embodiment includes a main pipeline, a first branch pipeline, and a second branch pipeline. The first branch pipeline is the flushing water discharge pipeline 111, and the second branch pipeline is connected to the first pipeline 101 through the first water inlet 1012. The one-way valve 110 is arranged on the second branch pipeline.

[0134] In some embodiments, the drainage end of the reverse flushing pipeline 12 converges with the flushing water discharge pipeline 111. Such a design can simplify the pipeline, so that the discharged water of the reverse flushing pipeline 12 and the discharged water of the circulating flushing pipeline 11 converge and are discharged into the external drainage system. Specifically, the end of the drain pipe section 121 of the reverse flushing pipeline 12 is connected to the main pipeline or the first branch pipeline of the circulating flushing pipeline 11 to realize the connection and convergence with the flushing water discharge pipeline 111.

[0135] It should be noted that in this embodiment, the pure water storage device 40 has various embodiments. For example, in the pure water tank mode of a desktop water dispenser, an external driving pump needs to be connected for water intake or regeneration; in the pressure bucket mode of a commercial water dispenser, etc., an external driving pump is not required, and a certain volume of purified water can be stored and driven by pressure for water intake or regeneration. In this embodiment, the pure water storage device 40 is embodied in the form of a pressure bucket.

[0136] Further, the heating device 50 includes a hot water tank, a heating structure, a temperature regulating device, etc. The heating structure includes a heating element, a rare earth thick film, etc., which can quickly heat the purified water to a specified temperature by heating. The temperature regulating device is connected to the pure water storage device 40 and the heating structure, and can control the water intake temperature by means of heat exchange or mixing water. The power of the above heating device 50 is controlled by the water purification system control unit according to the detected relevant sensing parameters. In this embodiment, the heating device 50 is embodied in the form of a hot water tank and a heating element.

[0137] Further, the water purification system further includes a water pump, which is used to realize the user's water intake function. For the program control of the opening and closing of each component and the operation of the whole machine, it mainly controls the start and stop of the booster pump, the power of the heating unit 1014, the power of the heating device 50, the temperature regulating device, and the opening and closing of the control valve group according to relevant detection parameters (such as the amount of purified water, time, water temperature, liquid level, etc.) to realize the switching of various operation modes. Since the focus of this embodiment is on flushing the pre-filter 10 and the post-filter 30 with hot water, the specific program control does not belong to the focus of this embodiment and will not be introduced in detail.

[0138] This embodiment provides a system for separately regenerating the pre-filter 10 and the post-filter 30 using hot water in-situ. Among them, the pre-filter 10 is regenerated by the forward circulation flushing pipeline 11 in which hot water circulates internally, which uses a separate heat source and has two different position designs for the heating components; the post-filter 30 is regenerated by the reverse flushing pipeline 12 that shares the heat source for pure drinking and regeneration, and can select separate or simultaneous regeneration according to the respective pollution degrees of the pre-filter 10 and the post-filter 30.

[0139] This embodiment provides a water purification system with a thermal regeneration pipeline, which combines the opening and closing of different components and valve groups in the logic control system, uses hot water to disinfect and regenerate the filter element, and can effectively extend the service life of the filter element.

[0140] According to an embodiment of the present invention, on the other hand, a water production control method for a water purification system is provided, which is applicable to the water purification system in any of the above embodiments. The water purification system has a regeneration mode, and the control method includes:

[0141] Receiving a start regeneration mode instruction; the control valve group conducts the water production pipeline, flushes water into the pre-filter 10, then closes the water production pipeline, conducts the circulation flushing pipeline 11, and circulates the flushed water forward into the pre-filter 10 to circulate and flush the pre-filter 10; and / or, the control valve group conducts the reverse flushing pipeline 12, and reversely passes the hot water in the heating device 50 into the post-filter 30 for hot water flushing.

[0142] In this embodiment, the pre-filter 10 and the post-filter 30 can be regenerated separately or simultaneously. Specifically, the separate or simultaneous regeneration can be selected according to the respective pollution degrees of the pre-filter 10 and the post-filter 30. The water source for the regeneration and cooling of the pre-activated carbon is tap water. Its regeneration uses an independent heat source, and the heating unit 1014 is only started during disinfection regeneration. Its water source is tap water, and the water flow direction of its regeneration pipeline is the same as that of the normal water supply pipeline, enabling continuous circulating flushing regeneration of the pre-filter 10. The contaminants on the activated carbon can be effectively stripped and removed in the flowing water. The water source for the post-filter 30 and its cooling is the pure water in the pure water storage device 40. The hot water used for its regeneration shares a heating device 50 with the water intake 200 of the drinking water purification system. The water flow direction of its regeneration pipeline is opposite to that of the normal water supply pipeline, enabling reverse flushing regeneration of the post-filter 30. While the reverse flushing pipeline 12 achieves effective regeneration, it can dredge the post-filter 30 through the reaction force and carry away impurities.

[0143] In some embodiments, after the water purification system receives the instruction to start the regeneration mode, the following steps are also executed: controlling the heating unit 1014 on the circulating flushing pipeline 11 and / or inside the pre-filter 10 to start, heating the flushing water, so as to circulate and flush the pre-filter 10 with hot water.

[0144] It should be noted that in this embodiment, the temperature of the water used for thermal regeneration is greater than the ambient normal temperature and less than the boiling point of water. The power of the heating unit 1014 is controlled by the system, or different temperature regeneration forms are achieved by adjusting the temperature control device of the heating device 50.

[0145] In some embodiments, after the thermal regeneration mode of the pre-filter 10 and / or the post-filter 30 ends, it enters the cooling mode, which specifically includes the following steps: controlling the first switching valve 1011 and the third switching valve 1111 to open, turning off the heating unit 1014, starting the water flow driving member 1013, and introducing the normal temperature cooling water entering from the tap water inlet 100 into the pre-filter 10, cooling the pre-filter 10 and then discharging it through the flushing water discharge pipeline 111; and / or controlling the normal temperature water in the pure water storage device 40 to flow reversely into the post-filter 30 for cooling, and discharging the normal temperature cooling wastewater through the flushing water discharge pipeline 111.

[0146] In some embodiments, the thermal regeneration mode and the cooling mode are controlled to alternate. By alternately operating the thermal regeneration mode and the cooling mode, the best regeneration effect can be achieved. The control valve group is alternately opened or closed, which can cooperate with the normal temperature cooling mode for alternate regeneration and cooling to obtain the best regeneration effect.

[0147] In some embodiments, the regeneration mode further includes a soaking step, which specifically includes the following steps: controlling the water flow driving member 1013 to close, and soaking the pre-filter element 10 with the hot water heated by the heating unit 1014; and / or, controlling the third switching valve 1111 to close, and soaking the post-filter element 30 with the hot water in the heating device 50.

[0148] When the set program starts the regeneration mode, the heated tap water enters the pre-filter element 10 forward through the circulation flushing pipeline 11, or the pure water heated in the heating device 50 enters the post-filter element 30 reversely through the reverse flushing pipeline 12. The control valve group controls the hot water in the pre-filter element 10 and the post-activated carbon filter to be in a flowing flushing or static soaking state according to the set logic. After the hot regeneration mode ends, the cooling mode is started. After the entire regeneration mode ends, it enters the normal water production mode.

[0149] Specifically, the hot regeneration mode includes a set time for hot water flowing flushing or / and a set time for static soaking. Further, the hot regeneration form includes various forms such as flowing water flushing, soaking, short-time flushing and disinfection, long-time soaking, or flowing regeneration, cold and hot water alternating flushing and regeneration, etc., and is alternately regenerated and cooled in cooperation with the normal temperature cooling mode to obtain the best regeneration effect. While the user is drinking normal water, the full-automatic in-situ disinfection and regeneration of the filter element are realized, including short-time disinfection and long-time regeneration, effectively ensuring the water purification performance and drinking water safety, and reducing the frequency of filter element replacement.

[0150] In some embodiments, the following steps are further included: obtaining the temperature information of the flushing water; according to the temperature information of the flushing water, adjusting the working parameters of the heating component of the heating unit 1014, and the working parameters include at least one of the opening and closing timing, heating duration, and heating power.

[0151] In the above embodiments, the working parameters of the heating component are adjusted in real time by obtaining the temperature information of the flushing water, avoiding the problems of too low or too high water temperature affecting the regeneration effect of the pre-activated carbon filter element or energy waste.

[0152] The water purification system provided in this embodiment realizes the in-situ regeneration of the filter element using hot water, specifically including a water production mode, a hot regeneration mode, and a cooling mode. Using hot water as the disinfection and regeneration medium, it avoids the precision filter element 20 that is not resistant to high temperature. By logically controlling the pipelines and components to switch different modes, functions such as normal water drinking by users, short-time flushing and disinfection of activated carbon, and long-time regeneration are realized.

[0153] The following combines the attached Figure 1 to the attached Figure 5 to introduce the water production mode, hot regeneration mode, and cooling mode of the water purification system in this embodiment.

[0154] 1. Water production mode (see Figure 1 , Figure 2 and Figure 3as shown in the figure

[0155] The tap water inlet 100 is connected to the coarse filter element 60. The coarse filter element 60 is connected to the pre-filter element 10 through the first switching valve 1011, a booster pump, and the heating unit 1014 (not operating), or directly. The pre-filter element 10 is connected to the precision filter element 20 through the second switching valve 3012. The precision filter element 20 has a concentrated water outlet and a water outlet. The concentrated water outlet is connected to the waste water switching valve 2011. The pure water enters the post-filter element 30 from the water outlet through the first switching valve 3011 (switched from the closed state to the first state), and then enters the pure water storage device 40, that is, the pressure tank, through the second switching valve 120 (switched from the closed state to the third state). The outlet of the pressure tank is connected to the heating device 50, that is, the hot tank. The heating device 50 can selectively heat the water flowing into the hot tank to provide hot water for users. Optionally, the pure water storage device 40 and the water intake 200 are connected through a normal temperature water pipe to provide normal temperature water for users.

[0156] 2. Thermal regeneration mode (see Figure 1 , Figure 2 and Figure 4 as shown in the figure):

[0157] For the thermal regeneration mode of the pre-filter element 10, control the first switching valve 1011 and the third switching valve 1111 to open, the second switching valve 3012 to close, and the booster pump and the heating unit 1014 to operate. After the tap water is pressurized by the first switching valve 1011 and the booster pump, the hot water heated by the heating unit 1014 enters the pre-filter element 10. When the filter element is full of hot water, the first switching valve 1011 and the third switching valve 1111 are closed, the booster pump continues to operate, and the water discharged from the pre-filter element 10 returns to the front of the pump through the check valve 110, continues to be heated and circulates, so as to realize the forward flushing of the pre-filter element 10 with hot water circulation.

[0158] For the thermal regeneration mode of the post pre-filter element 10: control the first switching valve 1011 and the second switching valve 3012 to close, the third switching valve 1111 to open, the first switching valve 3011 to open (switched to the second state), and the second switching valve 120 to open (switched to the fourth state). The hot water in the hot tank of the heating device 50 enters the post-filter element 30 reversely through the second switching valve 120, and the thermal regeneration waste water is discharged through the first switching valve 3011 and the third switching valve 1111, so as to realize the reverse flushing of the post-filter element 30 with hot water.

[0159] 3. Cooling mode (see Figure 1 , Figure 2 and Figure 5 as shown in the figure):

[0160] Pre-filter 10 cooling mode: control the first switching valve 1011 and the third switching valve 1111 to open, the second switching valve 3012 to close, the booster pump to start, and the heating unit 1014 not to operate; tap water enters the pre-filter 10 after passing through the first switching valve 1011 and being pressurized by the booster pump, and the normal temperature cooling wastewater is discharged through the third switching valve 1111, which is the cooling water flow path of the pre-filter 10.

[0161] Post-filter 30 cooling mode: control the first switching valve 3011 to open (switch to the second state), the second switching valve 120 to close (switch to the third state), the first switching valve 1011 and the second switching valve 3012 to close, and the third switching valve 1111 to open. The normal temperature pure water in the pressure tank enters the post-filter 30 through the second switching valve 120, and the normal temperature cooling wastewater is discharged through the opened first switching valve 3011 (switch to the second state) and the third switching valve 1111, which is the cooling water flow path of the post-filter 30.

[0162] In this embodiment, through the water purification system with a thermal regeneration pipeline and combined with a logic control method to control the opening and closing of different components of the system, hot water is used to disinfect and regenerate the filter element, which can effectively improve the service life of the filter element, extend the filter element replacement cycle, increase the rated net water volume of the whole machine, enhance the product competitiveness, and meet the requirements of energy conservation and environmental protection.

[0163] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A water purification system, characterized in that, Comprising: A water-making pipeline, on which a pre-filter (10), a post-filter (30), a pure water storage device (40), and a heating device (50) are connected in series in sequence; Among them, along the water flow direction in the water-making pipeline, the pre-filter (10) is sequentially provided with a pre-inlet and a pre-outlet, the post-filter (30) is sequentially provided with a post-inlet and a post-outlet, the heating device (50) is communicated with the pure water storage device (40), and is adapted to selectively heat the pure water in the pure water storage device (40), and both the pre-filter (10) and the post-filter (30) include a carbon water purification unit; A circulating flushing pipeline (11), which is arranged in parallel on the water-making pipeline, the inlet end of the circulating flushing pipeline (11) is communicated with the pre-outlet, and the outlet end is communicated with the pre-inlet, and is adapted to flush the pre-filter (10) forward through hot water; A reverse flushing pipeline (12), along the water flow direction in the reverse flushing pipeline (12), the reverse flushing pipeline (12) is sequentially connected to the heating device (50), the post-outlet, the post-filter (30), and the post-inlet, and is adapted to flush the post-filter (30) backward through hot water; A control valve group, which is arranged on the water-making pipeline, the circulating flushing pipeline (11) and the reverse flushing pipeline (12), and is adapted to switch and control the circulation of the water-making pipeline or control the reverse flushing pipeline (12) and / or control the circulation of the circulating flushing pipeline (11).

2. The water purification system according to claim 1, wherein The reverse flushing pipeline (12) includes a water inlet pipe section (122) connected between the hot water outlet of the heating device (50) and the post-outlet, and a drain pipe section (121) communicated with the post-inlet, and the control valve group includes: A first switching valve (3011), which is adapted to switch the connection between the pure water storage device (40) or the water inlet pipe section (122) and the post-outlet; A second switching valve (120), which is adapted to switch the connection between the water-making pipeline or the drain pipe section (121) and the post-inlet.

3. The water purification system according to claim 2, characterized in that, The first switching valve (3011) and the second switching valve (120) are both two-way valves, the two-way valve has three valve ports, two valve ports of the two-way valve are respectively connected to the water-making pipeline, and the other valve port of the two-way valve is connected to the reverse flushing pipeline (12).

4. The water purification system according to claim 2, characterized in that The water-making pipeline includes: A first pipeline (101), one end of which is communicated with a tap water port, and the other end is communicated with the pre-inlet; A second pipeline (301), one end of which is communicated with the pre-outlet, and the other end is communicated with the water inlet of the post-filter (30); A third pipeline (401), one end of which is communicated with the post-outlet, and the other end is communicated with the water inlet of the pure water storage device (40); Among them, one end of the drain pipe section (121) of the reverse flushing pipeline (12) is connected to the second pipeline (301) through the first switching valve (3011), and the other end is communicated with an external drainage system; One end of the water inlet pipe section (122) of the reverse flushing pipeline (12) is connected to the hot water outlet of the heating device (50), and the other end is connected to the third pipeline (401) through the second switching valve (120).

5. The water purification system according to claim 4, characterized in that, The control valve group further includes: A first switching valve (1011) is arranged on the first pipeline (101) and is adapted to control the on-off of the water path between the tap water port and the pre-filter (10). A second switching valve (3012) is arranged on the second pipeline (301) and is adapted to control the on-off of the water path between the pre-filter (10) and the post-filter (30).

6. The water purification system according to claim 5, characterized in that, The water purification system further includes: A precision filter (20) is connected in series on the second pipeline (301), and the second switching valve (3012) is arranged on the second pipeline (301) between the pre-filter (10) and the precision filter (20). The first switching valve (3011) is arranged on the second pipeline (301) between the precision filter (20) and the post-filter (30) and is adapted to switch the connection between the precision filter (20) or the drain pipe section (121) and the post-inlet.

7. The water purification system according to any one of claims 1 to 3, characterized in that, A heating unit (1014) is arranged on the circulating flushing pipeline (11) and / or inside the pre-filter (10), and the heating unit (1014) is used to heat the flushing water of the pre-filter (10).

8. The water purification system according to any one of claims 1 to 3, characterized in that, A one-way valve (110) is arranged on the circulating flushing pipeline (11), and the one-way valve (110) is used to make the water flow unidirectionally from the inlet end of the circulating flushing pipeline (11) to the outlet end of the circulating flushing pipeline (11).

9. The water purification system according to any one of claims 1 to 3, characterized in that A water flow driving member (1013) is arranged on the circulating flushing pipeline (11) or on the water production pipeline, and the water flow driving member (1013) is adapted to drive the flushing water in the circulating flushing pipeline (11) to circulate forward to flush the pre-filter (10).

10. The water purification system according to any one of claims 1 to 3, characterized in that, The circulating flushing pipeline (11) branches out a flushing water discharge pipeline (111) adapted to communicate with an external drainage system. The control valve group further includes: A third switching valve (1111) is arranged on the flushing water discharge pipeline (111) and is used to control the on-off of the flushing water discharge pipeline (111).

11. A water production control method for a water purification system, characterized in that, Applicable to the water purification system according to any one of the above claims 1 to 10, the water purification system has a regeneration mode, and the control method includes: Receiving a command to start the regeneration mode; The control valve group conducts the water production pipeline, feeds flushing water into the pre-filter (10), then closes the water production pipeline, conducts the circulating flushing pipeline (11), and circulates the flushed water forward into the pre-filter (10) to circulate and flush the pre-filter (10). And / or, the control valve group conducts the reverse flushing pipeline (12), and reversely feeds the hot water in the heating device (50) into the post-filter (30) for hot water flushing.

12. The water production control method of the water purification system according to claim 11, characterized in that, After the water purification system receives the command to start the regeneration mode, the following steps are further executed; Control the heating unit (1014) on the circulating flushing pipeline (11) and / or inside the pre-filter (10) to start, heat the flushing water, and use the hot water to circulate and flush the pre-filter (10).

13. The water production control method of the water purification system according to claim 12, characterized in that, After the thermal regeneration mode of the pre-filter (10) and / or the post-filter (30) ends, enter the cooling mode, which specifically includes the following steps: Control the first switching valve (1011) and the third switching valve (1111) to open, turn off the heating unit (1014), start the water flow driving member (1013), introduce the normal temperature cooling water entering from the tap water inlet (100) into the pre-filter (10), cool the pre-filter (10) and then discharge it through the flushing water discharge pipeline (111); And / or, control the normal temperature water in the pure water storage device (40) to flow reversely into the post-filter (30) for cooling, and the normal temperature cooling waste water is discharged through the flushing water discharge pipeline (111).

14. The water production control method of the water purification system according to claim 13, characterized in that, Control the thermal regeneration mode and the cooling mode to alternate.

15. The water production control method of the water purification system according to any one of claims 12 to 14, characterized in that, The regeneration mode further includes an immersion step, which specifically includes the following steps: Control the water flow driving member (1013) to close, and immerse the pre-filter (10) with the hot water heated by the heating unit (1014); and / or, control the third switching valve (1111) to close, and immerse the post-filter (30) with the hot water in the heating device (50).

16. The water production control method of the water purification system according to any one of claims 12 to 14, characterized in that, During the thermal regeneration mode, the temperature of the flushing water for the pre-filter (10) and / or the post-filter (30) is greater than the ambient temperature and less than the boiling point of water.

Images