Water heater capable of recycling pure water

Abstract

The embodiment of the utility model discloses a water heater for recovering pure water, which comprises a filtering system, a water inlet pipeline, a pure water pipeline, a waste water pipeline, a heating pipeline and a second pressure tank, and the second pressure tank is connected with a first control valve and a second control valve. The first two-way pump is connected with the water inlet end of the RO membrane through the second pressure tank. Through the recycling pipeline, after the water heater is shut down, pure water which is heated but not received and used by a user is recycled, and it is guaranteed that when the user uses the water heater again, obtained head cup water is hot water meeting the temperature requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, in particular to a water heater for recovering pure water. Background Art

[0002] A water heater is an indispensable household product in daily life. It is used to provide hot water for users' daily life, that is, to heat water. During the heating process, water will produce scale. The amount of scale produced depends on the impurity content in the water. The scale will accumulate in the water heater, bringing risks to the water heater's applicability and reducing the service life of the water heater. Therefore, in order to prolong the life of the water heater, most of the existing technologies input concentrated water and / or pure water into the water heater to reduce scale formation in the water heater.

[0003] In the prior art, concentrated water and / or pure water can be obtained through a filtering device, for example, an RO water purifier including a reverse osmosis filter membrane (RO membrane). However, when the RO water purifier stops working, the TDS (total dissolved solids) in the raw water will penetrate the RO membrane through the action of forward osmosis. When the RO machine changes from a shutdown state to a water production state, the generated pure water will mix with the TDS that has passed through, causing the pure water remaining in the pipeline between the water purifier and the heater to be contaminated. Therefore, whenever the RO machine is shut down for a period of time and then produces water, the TDS of the first cup of water is relatively high, and the longer the shutdown time, the higher the TDS.

[0004] At the same time, residual pure water that has been heated but not discharged will remain in the heating pipeline and the pure water pipeline. Since the temperature of the residual pure water decreases over time, when the user uses the heater to obtain hot water again, the first thing the user gets is the residual pure water with the temperature lowered. The water heater cannot discharge hot water immediately, causing inconvenience to the user. Utility Model Content

[0005] In view of this, the utility model provides a pure water recovery water heater, which is used to solve the problem in the prior art that the pure water remaining in the pipeline between the water purifier and the heater is contaminated, which increases the amount of scale generated by the water heater and affects the service life of the water heater. To achieve one or part or all of the above purposes or other purposes, the utility model proposes a pure water recovery water heater comprising: a pure water recovery water heater, comprising: a filtration system, a water inlet pipeline, a pure water pipeline, a waste water pipeline and a heating pipeline, the water inlet pipeline is connected to the water inlet end of the filtration system, the filtration system comprises a first two-way pump, a composite filter element and an RO membrane, the water outlet end of the composite filter element is connected to the water inlet end of the RO membrane, the water outlet end of the composite filter element is connected to the water inlet end of the RO membrane through the first two-way pump, the waste water pipeline is connected to the waste water outlet of the filtration system, the pure water pipeline is connected to the water outlet end of the filtration system, the pure water pipeline comprises a first control valve and a second control valve, the pure water pipeline is connected to the water inlet of the heating pipeline through a second control valve with a shunt function, and the water outlet of the heating pipeline is connected to the pure water pipeline downstream of the second control valve, characterized in that the water heater also comprises a second pressure tank, the second pressure tank is connected to the first control valve and the second control valve, and the first two-way pump is connected to the water inlet end of the RO membrane through the second pressure tank.

[0006] Optionally, the second pressure tank is provided with a first two-way guide port, a second two-way guide port, a third two-way guide port and a fourth two-way guide port, the first two-way guide port of the second pressure tank is connected to the first two-way pump, the second two-way guide port of the second pressure tank is connected to the water inlet end of the RO membrane, the third two-way guide port of the second pressure tank is connected to the heating pipeline, and the fourth two-way guide port of the second pressure tank is connected to the pure water end of the RO membrane.

[0007] Optionally, the second pressure tank further includes a diaphragm, which is disposed in the second pressure tank and divides the second pressure tank into a first space and a second space.

[0008] Optionally, the first two-way air guide port and the second two-way air guide port are arranged in the first space.

[0009] Optionally, the third two-way air guide port and the fourth two-way air guide port are arranged in the second space.

[0010] Optionally, the diaphragm is made of elastic and sealed material.

[0011] Optionally, the diaphragm is used to change the pressure of the first space and the second space.

[0012] Optionally, the pure water pipeline also includes a water quality detection component, a high-pressure switch, a flow sensor and a temperature sensor. The water quality detection component is arranged between the pure water end of the RO membrane and the high-pressure switch. The pure water end of the RO membrane is connected to the first control valve. The high-pressure switch is arranged between the pure water end of the RO membrane and the first control valve. The water outlet end of the first control valve is connected to the water inlet end of the second control valve. The flow sensor is arranged between the first control valve and the second control valve. The temperature sensor is arranged downstream of the connection between the water outlet of the heating pipeline and the pure water pipeline. The second pressure tank is arranged between the first control valve and the flow sensor.

[0013] Optionally, the filtration system also includes an inlet valve, a water quality detector, a cleaning check valve, a cleaning valve, a first pressure tank, and a pressure tank inlet valve. The first pressure tank is connected to the pure water end of the RO membrane through the pressure tank inlet valve. The first pressure tank is also connected to the water inlet end of the cleaning valve through the pressure tank inlet valve. The water outlet end of the cleaning valve is connected to the inlet valve through the cleaning check valve. The water inlet valve connects the pure water end of the composite filter element and the water outlet end of the cleaning check valve. The water inlet valve is also connected to the first two-way pump. The water quality detector is arranged between the first two-way pump and the second pressure tank.

[0014] Optionally, when the water inlet valve of the pressure tank is opened and the first control valve is opened, the first pressure tank is connected to the second pressure tank.

[0015] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0016] The present application connects the first space of the second pressure tank with the first two-way pump of the filtration system. When the first two-way pump is working, the first two-way pump injects water into the first space of the second pressure tank, so that the diaphragm in the second pressure tank moves toward the second space, that is, the pressure in the second space increases. Since the second space is connected to the pure water end of the RO membrane and the heating pipeline, that is, the pure water is input to the heating pipeline through the second space, when the pressure in the second space increases, the second space receives the pure water and inputs the pure water to the heating pipeline more quickly; and when the water heater stops working, the water in the first space is discharged. The diaphragm moves toward the first space and the cavity of the second space becomes larger, that is, the pressure in the second space decreases, and the clean water discharged from the heating pipeline is recovered (the pure water that has been heated but not received and used by the user is recovered), and the recovered clean water is stored in the second space. When the water heater is used again, the recovered clean water is re-input into the heating pipeline, and the user receives the pure water currently heated by the water heater, so that the user can obtain pure water that meets the temperature requirement at the first time, that is, the first cup of water is hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] in:

[0019] Figure 1 It is a structural schematic diagram of a pure water recovery water heater provided in an embodiment of the present application;

[0020] Figure 2 It is a structural schematic diagram of another pure water recovery water heater provided in an embodiment of the present application;

[0021] Figure 3 It is a structural schematic diagram of a second pressure tank in a pure water recovery water heater provided in an embodiment of the present application;

[0022] Figure 4 is a schematic structural diagram of another second pressure tank provided in an embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the connection between a first pressure tank and a second pressure tank in a pure water recovery water heater provided in an embodiment of the present application;

[0024] Filtration system 1, water inlet valve 11, first two-way pump 12, water quality detector 13, one-way valve 14, cleaning valve 15, first pressure tank 16, pressure tank water inlet valve 17, composite filter element 18, RO membrane 19, water inlet pipeline 2, pure water pipeline 3, first control valve 31, second control valve 32, water quality detection component 33, high-pressure switch 34, flow sensor 35, temperature sensor 36, wastewater pipeline 4, wastewater valve 41, heating pipeline 5, second pressure tank 6, first two-way guide port 61, second two-way guide port 62, third two-way guide port 63, fourth two-way guide port 64, diaphragm 65, first space 66, second space 67. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] like Figure 1 As shown, the embodiment of the present application provides a pure water recovery water heater comprising: a filtration system 1, a water inlet pipeline 2, a pure water pipeline 3, a waste water pipeline 4 and a heating pipeline 5, wherein the pure water pipeline 3 is provided with a first control valve 31 and a second control valve 32, the filtration system 1 comprises a first two-way pump 12, a composite filter element 18 and an RO membrane 19, the water outlet end 18 of the composite filter element is connected to the water inlet end of the RO membrane 19, the water outlet end of the composite filter element 18 is connected to the water inlet end of the RO membrane 19 through the first two-way pump 12, the water inlet pipeline 3 is connected to the water inlet end of the filtration system 1, and the waste water pipeline 4 is connected to the water inlet end of the filtration system 1. The wastewater outlet of the filtration system 1 is connected, and the filtration system 1 includes a first two-way pump 12 for cleaning. The pure water pipeline 3 is connected to the water outlet of the filtration system 1. The pure water pipeline 3 is connected to the water inlet of the heating pipeline 5 through a second control valve 32 with a diversion function. The water outlet of the heating pipeline 5 is connected to the pure water pipeline downstream of the second control valve 32. The water heater also includes a second pressure tank 6, and the second pressure tank 6 is connected to the first control valve 31 and the second control valve 32. The first two-way pump 12 is connected to the water inlet of the RO membrane 19 through the second pressure tank 6.

[0028] In a possible embodiment, the second pressure tank 6 is provided with a first two-way guide port 61, a second two-way guide port 62, a third two-way guide port 63, a fourth two-way guide port 64 and a diaphragm 65, the first two-way guide port 61 of the second pressure tank 6 is connected to the first two-way pump 12, the second two-way guide port 62 of the second pressure tank 6 is connected to the water inlet end of the RO membrane 19, the third two-way guide port 63 of the second pressure tank 6 is connected to the heating pipeline 5, and the fourth two-way guide port 64 of the second pressure tank 6 is connected to the pure water end of the RO membrane 19.

[0029] Specifically, the first bidirectional pump 12 injects water into the first space 66 of the second pressure tank 6, so that the diaphragm 65 in the second pressure tank 6 moves toward the second space side, that is, the pressure in the second space 67 increases. Since the second space 67 is connected to the pure water end of the RO membrane 19 through the fourth bidirectional guide port 64 and connected to the heating pipeline 5 through the third bidirectional guide port 63, that is, the pure water produced by the pure water end of the RO membrane 19 is input into the heating pipeline 5 through the second space 67, when the pressure in the second space 67 increases, the second space 6 7 receives the pure water and inputs the pure water into the heating pipeline 5 more quickly; and when the water heater stops working, the water in the first space 66 is discharged (after being used for cleaning the RO membrane 19, it is discharged through the waste water end of the RO membrane 19), the diaphragm 65 moves toward the first space side, and the cavity of the second space 67 becomes larger, that is, the pressure in the second space 67 is reduced, and then the clean water discharged from the heating pipeline 5 is recovered (the pure water that has been heated but not received and used by the user is recovered), and the recovered clean water is stored in the second space 67.

[0030] Illustratively, the pure water produced by the RO membrane 19 is input into the second space 67 by means of the thrust of the first bidirectional pump 12, and the thrust of the first bidirectional pump 12 is much greater than the repulsion of the pure water after the pressure in the second space 67 increases. Therefore, the repulsion of the pure water caused by the increase in pressure in the second space 67 can be ignored, that is, the repulsion of the pure water caused by the increase in pressure in the second space 67 does not affect the entry of the pure water into the second space 67. After the pure water enters the second space 67, due to the high pressure in the second space 67, a thrust is generated on the pure water in the second space 67, thereby accelerating the output of the pure water from the second space 67.

[0031] Embodiment 1:

[0032] like Figure 2As shown, when the pure water recovery water heater works normally, that is, when the high-pressure switch 34, the first control valve 31 and the second control valve 32 are opened, the water inlet pipe 2 inputs the raw water into the filtration system 1, the filtration system 1 processes the raw water, and inputs the generated pure water into the pure water pipe 3 through the water outlet. When the pure water passes through the water quality detection component 33 on the pure water pipe 3, the water quality detection component 33 samples and detects the pure water to obtain the TDS value of the pure water. If the TDS value meets the preset conditions, the high-pressure switch 34, the first control valve 31 and the second control valve 32 are kept open. After the pure water that meets the preset conditions passes through the open high-pressure switch 34 and the first control valve 31, it passes through the second space 67 and the flow sensor 35, is diverted by the second control valve 32, and then input into the heating pipe.

[0033] Exemplarily, after the temperature sensor 36 measures the temperature of the mixed pure water, it can compare the temperature of the mixed pure water with the water temperature preset by the user to obtain the difference between the temperature of the mixed pure water and the water temperature preset by the user, and then adjust the diversion capacity of the second control valve 32 and the heating capacity of the heating pipeline according to the difference and the flow sensor 35.

[0034] Exemplarily, when the pure water recovery water heater stops working, the filtration system 1 no longer discharges pure water, that is, the first bidirectional pump 12 no longer injects water into the first space 66 of the second pressure tank 6, and then the diaphragm 65 moves toward the first space side, and the pressure in the second space 67 decreases. Since the fluid has the characteristic of flowing from high pressure to low pressure, the pure water that has been output from the heating device but not received and used by the user flows to the second space 67, realizing the recovery process.

[0035] When the pure water recovery water heater stops working and the cleaning function is turned on, the first cleaning method is: the first two-way pump 12 extracts the pure water in the second pressure tank 6, and transports the pure water in the second pressure tank 6 to the water outlet end of the composite filter element 18, that is, the pure water and the water at the water outlet end of the composite filter element 18 are merged. The TDS value of the merged water is obviously smaller than the TDS value of the water at the water outlet end of the composite filter element 18. Therefore, the merged water is input into the water inlet end of the RO membrane, and the RO membrane is flushed with the merged water, and the flushing waste water is discharged through the wastewater valve 41 in the wastewater pipeline 4.

[0036] Exemplarily, when the pure water recovery water heater stops working and the cleaning function is turned on, the second cleaning method is: open the pressure tank water inlet valve 17, and the wastewater valve 41 in the wastewater pipe 4 is opened, that is, the pressure at the wastewater end of the RO membrane 19 is less than the pressure in the first pressure tank 16, and then the pure water in the first pressure tank 16 flows to the wastewater valve 41 in the wastewater pipe 4 under the action of pressure, and in the process of the pure water flowing to the wastewater valve 41 in the wastewater pipe 4, it passes through the RO membrane 19 and cleans the RO membrane 19.

[0037] Exemplarily, after cleaning is completed by the first cleaning method and / or the second cleaning method, the first pressure tank 16 needs to be replenished with water. The replenishment process is as follows: the first control valve 31 is closed, the cleaning valve 15 is closed, the water inlet valve 11 is opened, and the pressure tank water inlet valve 17 is opened. The first two-way pump 12 extracts water from the water outlet side of the composite filter element 18, and inputs the water from the water outlet side of the composite filter element 18 into the water inlet end of the RO membrane 19. The water outlet end of the RO membrane 19 produces pure water, and the pure water flows into the first pressure tank 16 through the pressure tank water inlet valve 17 to complete the water replenishment.

[0038] Exemplarily, during the water replenishment process, the pressure tank water inlet valve 17 and the first control valve 31 can be opened first, the cleaning valve 15 is closed, the water inlet valve 11 is closed, and the first two-way pump 12 does not work. Since the pressure in the first pressure tank 16 is lower than the pressure in 3, the pure water in 3 and the pure water in the second space are sucked into the first pressure tank 16 under the action of pressure. The end time can be determined by detecting the liquid volume of the pure water in the second space. For example, when the liquid volume of the pure water in the second space 67 is less than the threshold, the first control valve 31 is closed. After the first control valve 31 is closed, the water inlet valve 11 is opened, the pressure tank water inlet valve 17 is opened, and the first two-way pump 12 extracts water from the water outlet side of the composite filter element 18, and inputs the water from the water outlet side of the composite filter element 18 into the water inlet end of the RO membrane 19. The water outlet end of the RO membrane 19 produces pure water, and the pure water flows into the first pressure tank 16 through the pressure tank water inlet valve 17 to complete the water replenishment. The process of recycling the pure water in the second space 67 to the first pressure tank 16 is realized.

[0039] Embodiment 2:

[0040] like Figure 3As shown, in a possible embodiment, the second pressure tank 6 is provided with a first two-way guide port 61, a second two-way guide port 62, a third two-way guide port 63 and a fourth two-way guide port 64 in a first preset manner. The first two-way guide port 61 of the second pressure tank 6 is connected to the first two-way pump 12, the second two-way guide port 62 of the second pressure tank 6 is connected to the water inlet end of the RO membrane 19, the third two-way guide port 63 of the second pressure tank is connected to the heating pipeline 5, and the fourth two-way guide port 64 of the second pressure tank is connected to the pure water end of the RO membrane 19. The second pressure tank 6 also includes a diaphragm 65, which is arranged in the second pressure tank 6, and the diaphragm 65 divides the second pressure tank 6 into a first space 66 and a second space 67. The first two-way guide port 61 and the second two-way guide port 62 are arranged in the first space 66. The third two-way guide port 63 and the fourth two-way guide port 64 are arranged in the second space 67. The diaphragm 65 is made of elastic and sealed material. The diaphragm 65 is used to change the pressure of the first space 66 and the second space 67 .

[0041] Exemplarily, a first two-way guide port 61, a second two-way guide port 62, a third two-way guide port 63 and a fourth two-way guide port 64 are arranged on the first symmetrical side wall of the second pressure tank 6 in a first preset manner. The pure water output from the pure water end of the RO membrane 19 flows through the third two-way guide port 63 and accumulates in the second space 67. When the pure water fills the second space 67, it flows to the heating pipeline 5 through the fourth two-way guide port 64.

[0042] like Figure 4 As shown, in a possible embodiment, the second pressure tank is provided with a first two-way guide port 61, a second two-way guide port 62, a third two-way guide port 63 and a fourth two-way guide port 64 in a second preset manner. The first two-way guide port 61 of the second pressure tank 6 is connected to the first two-way pump 12, the second two-way guide port 62 of the second pressure tank 6 is connected to the water inlet end of the RO membrane 19, the third two-way guide port 63 of the second pressure tank is connected to the heating pipeline 5, and the fourth two-way guide port 64 of the second pressure tank is connected to the pure water end of the RO membrane 19. The second pressure tank 6 also includes a diaphragm 65, which is arranged in the second pressure tank 6, and the diaphragm 65 divides the second pressure tank 6 into a first space 66 and a second space 67. The first two-way guide port 61 and the second two-way guide port 62 are arranged in the first space 66. The third two-way guide port 63 and the fourth two-way guide port 64 are arranged in the second space 67. The diaphragm 65 is made of elastic and sealed material. The diaphragm 65 is used to change the pressure of the first space 66 and the second space 67 .

[0043] Exemplarily, a first two-way guide port 61, a second two-way guide port 62, a third two-way guide port 63 and a fourth two-way guide port 64 are arranged on the second symmetrical side wall of the second pressure tank 6 in a second preset manner, and the pure water output from the pure water end of the RO membrane 19 flows through the third two-way guide port 63 and accumulates in the second space 67. When the pure water accumulates to a certain height, it flows to the heating pipeline 5 through the fourth two-way guide port 64. The accumulation of pure water does not require the pure water to fill the second space 67 before it can flow to the heating pipeline 5 through the fourth two-way guide port 64, so that the pure water can flow through the second space 67 more quickly.

[0044] Embodiment three:

[0045] For example, in real life, after the water heater is shut down, it may not be necessary to perform a cleaning process on the filter system every time it is shut down. For example, the filter system is cleaned once after the water heater is shut down a preset number of times (after a preset accumulated working time). Then, when the cleaning process is not performed, the diaphragm 65 moves toward the first space side and the cavity of the second space 67 becomes larger, that is, the pressure in the second space 67 decreases, and the clean water discharged from the heating pipeline 5 is recovered (the pure water that has been heated but not received and used by the user is recovered), and the recovered clean water is stored in the second space 67.

[0046] When the pure water recovery water heater continues to work, the first two-way pump 12 injects water into the first space 66 of the second pressure tank 6, so that the diaphragm 65 in the second pressure tank 6 moves toward the second space side, that is, the pressure in the second space 67 increases. Since the second space 67 is connected to the pure water end of the RO membrane 19 through the fourth two-way guide port 64 and is connected to the heating pipeline 5 through the third two-way guide port 63, that is, the pure water produced by the pure water end of the RO membrane 19 is mixed with the recovered clean water when passing through the second space 67, and is input into the heating pipeline 5, and the pure water discharged from the heating pipeline but not received by the user is recovered, so that there is no residual pure water in the heating pipeline. Then, when the water heater is used again, the user receives the pure water currently heated by the water heater, so that the user can obtain pure water that meets the temperature requirement at the first time, that is, the first cup of water is hot water.

[0047] Exemplarily, after the water heater is shut down for a preset number of times (after a preset cumulative working time), the filter system 1 is cleaned, or, if the water heater is not used again for a long time, in order to prevent the pure water recovered into the second space 67 from deteriorating, the pure water in the second space 67 is used to clean the filter system 1, or the pure water in the second space 67 is used to replenish the first pressure tank 16. Specifically, Figure 5As shown, the pressure tank water inlet valve 17 and the first control valve 31 are opened first, the cleaning valve 15 is closed, the water inlet valve 11 is closed, and the first two-way pump 12 does not work. Since the pressure in the first pressure tank 16 is lower than the pressure in 3, the pure water in 3 and the pure water in the second space are sucked into the first pressure tank 16 under the action of pressure. The end time can be determined by detecting the liquid volume of the pure water in the second space. For example, when the liquid volume of the pure water in the second space 67 is less than the threshold, the first control valve 31 is closed. After the first control valve 31 is closed, the water inlet valve 11 is opened, the pressure tank water inlet valve 17 is opened, and the first two-way pump 12 extracts the water on the water outlet side of the composite filter element 18, and inputs the water on the water outlet side of the composite filter element 18 into the water inlet end of the RO membrane 19. The water outlet end of the RO membrane 19 produces pure water, which flows into the first pressure tank 16 through the pressure tank water inlet valve 17 to complete the water replenishment. The process of recycling the pure water in the second space 67 to the first pressure tank 16 is realized.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described above, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0049] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A pure water recovery water heater, comprising: A filtration system, a water inlet pipeline, a pure water pipeline, a waste water pipeline and a heating pipeline, wherein the water inlet pipeline is connected to the water inlet end of the filtration system, the filtration system comprises a first two-way pump, a composite filter element and an RO membrane, the water outlet end of the composite filter element is connected to the water inlet end of the RO membrane, the water outlet end of the composite filter element is connected to the pure water end of the RO membrane through the first two-way pump, the waste water pipeline is connected to the waste water outlet of the filtration system, the pure water pipeline is connected to the water outlet end of the filtration system, the pure water pipeline comprises a first control valve and a second control valve, the pure water pipeline is connected to the water inlet of the heating pipeline through a second control valve with a shunt function, and the water outlet of the heating pipeline is connected to the pure water pipeline downstream of the second control valve, characterized in that the water heater also comprises a second pressure tank, the second pressure tank is connected to the first control valve and the second control valve, and the first two-way pump is connected to the water inlet end of the RO membrane through the second pressure tank.

2. The pure water recovery water heater according to claim 1, characterized in that: The second pressure tank is provided with a first two-way guide port, a second two-way guide port, a third two-way guide port and a fourth two-way guide port. The first two-way guide port of the second pressure tank is connected to the first two-way pump, the second two-way guide port of the second pressure tank is connected to the water inlet end of the RO membrane, the third two-way guide port of the second pressure tank is connected to the heating pipeline, and the fourth two-way guide port of the second pressure tank is connected to the pure water end of the RO membrane.

3. The pure water recovery water heater according to claim 1, characterized in that: The second pressure tank further includes a diaphragm, which is disposed in the second pressure tank and divides the second pressure tank into a first space and a second space.

4. The pure water recovery water heater according to claim 2, characterized in that: The first two-way air guide port and the second two-way air guide port are disposed in the first space.

5. The pure water recovery water heater according to claim 2, characterized in that: The third two-way air guide port and the fourth two-way air guide port are disposed in the second space.

6. The pure water recovery water heater according to claim 3, characterized in that: The diaphragm is made of elastic and airtight material.

7. The pure water recovery water heater according to claim 3, characterized in that: The diaphragm is used to change the pressure of the first space and the second space.

8. The pure water recovery water heater according to claim 1, characterized in that: The pure water pipeline also includes a water quality detection component, a high-pressure switch, a flow sensor and a temperature sensor. The water quality detection component is arranged between the pure water end of the RO membrane and the high-pressure switch. The pure water end of the RO membrane is connected to the first control valve. The high-pressure switch is arranged between the pure water end of the RO membrane and the first control valve. The water outlet end of the first control valve is connected to the water inlet end of the second control valve. The flow sensor is arranged between the first control valve and the second control valve. The temperature sensor is arranged downstream of the connection between the water outlet of the heating pipeline and the pure water pipeline. The second pressure tank is arranged between the first control valve and the flow sensor.

9. The pure water recovery water heater according to claim 1, characterized in that: The filtration system also includes an inlet valve, a water quality detector, a cleaning one-way valve, a cleaning valve, a first pressure tank, and a pressure tank inlet valve. The first pressure tank is connected to the pure water end of the RO membrane through the pressure tank inlet valve. The first pressure tank is also connected to the water inlet end of the cleaning valve through the pressure tank inlet valve. The water outlet end of the cleaning valve is connected to the inlet valve through the cleaning one-way valve. The water inlet valve connects the pure water end of the composite filter element and the water outlet end of the cleaning one-way valve. The water inlet valve is also connected to the first two-way pump. The water quality detector is arranged between the first two-way pump and the second pressure tank.

10. The pure water recovery water heater according to claim 9, characterized in that: When the water inlet valve of the pressure tank is opened and the first control valve is opened, the first pressure tank is connected to the second pressure tank.

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