CN218879554U - Water purifier - Google Patents

Abstract

The utility model relates to a purifier technical field, concretely relates to purifier. The water purifier comprises a water purification system, a hot water system, a flow regulating device, a backflow branch and a switch unit, wherein the water purification system comprises a water inlet pipeline, a water treatment filter element and a water outlet pipeline which are sequentially connected, and the water purification system is suitable for preparing pure water; the hot water system is connected to the water outlet pipeline to heat the pure water and discharge the hot water; the flow regulating device is connected between the hot water system and the water outlet pipeline so as to regulate the flow of the pure water entering the hot water system from the water outlet pipeline; one end of the backflow branch is connected between the water outlet pipeline and the flow regulating device, and the other end of the backflow branch is communicated with the water inlet pipeline, so that redundant pure water which does not enter the hot water system in the water outlet pipeline is guided into the water inlet pipeline; the switch unit has the on state that switches on the backward flow branch road when water purification system work and the off state who cuts off the backward flow branch road when water purification system stop work. Thereby providing a purifier that volume is less and the noise is lower.

Description

Water purifier

Technical Field

The utility model relates to a purifier technical field, concretely relates to purifier.

Background

The water purification and heating integrated water purifier integrates a water purification system and a heating system, is provided with an instant heating module, can heat purified water instantly, can accurately control the water outlet temperature, and can continuously take a lot of hot water. However, for the instant heating type heating mode, the heating power of the heating module is limited, and the flow rate of the purified water entering the heating module has a limitation requirement, for example, for a 2000W heating module, the water flow rate may only reach 0.3L/min when the heating module is required to be heated to a boiling water state instantly.

However, the flow of the water purifiers on the market is large, the maximum flow is 1200 gallons (the flow of the purified water is 3L/min), and the flow of the purified water is far larger than the bearing capacity of the heating module. Therefore, the large-flow water purifier is required to be made into an instant heating type heat purification all-in-one machine, a water tank is generally required to be arranged to serve as buffering water storage, then a small water pump is used for pumping water in the water tank to enter a heating system for heating, so that the whole volume of the water purifier is large, certain noise is generated when the water pump works, and inconvenience is brought to users.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the great defect of water purifier volume and noise among the prior art to a less and lower purifier of noise of volume is provided.

In order to solve the above problem, the utility model provides a water purifier, include: the water purification system comprises a water inlet pipeline, a water treatment filter element and a water outlet pipeline which are connected in sequence, and the water purification system is suitable for preparing pure water; a hot water system connected to the water outlet pipeline to heat the pure water and discharge the hot water; the flow regulating device is connected between the hot water system and the water outlet pipeline so as to regulate the flow of the pure water entering the hot water system from the water outlet pipeline; one end of the backflow branch is connected between the water outlet pipeline and the flow regulating device, and the other end of the backflow branch is communicated with the water inlet pipeline, so that redundant pure water which does not enter the hot water system in the water outlet pipeline is guided into the water inlet pipeline; the switch unit has the on state that switches on the backward flow branch road when water purification system work and the off state who cuts off the backward flow branch road when water purification system stop work.

Optionally, the pressure value in the water outlet pipeline changes according to the flow rate of pure water entering the hot water system, the switch unit is in a closed state when the pressure value in the water outlet pipeline is greater than a preset pressure value, and the switch unit is in an open state when the pressure value in the water outlet pipeline is less than or equal to the preset pressure value.

Optionally, the water purifier further includes a flow control unit, and the flow control unit controls the flow of the water inlet pipeline according to the flow of the backflow branch, so that the flow of water entering the water treatment filter element is constant.

Optionally, the switch unit has a pure water inlet, a pure water outlet and a reflux inlet, the pure water inlet is connected to the water outlet pipeline, the pure water outlet is connected to the flow regulator, and the reflux inlet is connected to one end of the reflux branch; the flow control unit is provided with a raw water inlet, a mixed water outlet and a backflow outlet, the raw water inlet is communicated with the water inlet pipeline, the mixed water outlet is communicated with the water treatment filter element, and the backflow outlet is connected with the other end of the backflow branch.

Optionally, the switch unit and the flow control unit are integrated into a switch flow valve, and the backflow branch is a backflow channel arranged inside the switch flow valve.

Optionally, the switching flow valve is a pressure-stabilizing backflow valve for keeping the pressure at the mixed water outlet stable.

Optionally, the flow regulating device is a stepless speed regulating valve.

Optionally, the water outlet pipeline comprises a pure water branch and a hot water branch, and the pure water branch can selectively discharge pure water; the hot water branch is communicated with the hot water system, one end of the backflow branch is connected to the hot water branch, and the flow regulating device is arranged on the hot water branch.

Optionally, the hot water system further includes a heating module, a heat exchanger, a reversing valve and a hot water outlet, the heating module is communicated with the heat exchanger, the flow regulating device and the reversing valve, the heat exchanger is communicated with the flow regulating device, the reversing valve and the hot water outlet, the reversing valve is communicated with the hot water outlet, the reversing valve has a first working position and a second working position, when the reversing valve is in the first working position, hot water flowing out of the heating module flows out of the hot water outlet through the reversing valve, and when the reversing valve is in the second working position, hot water flowing out of the heating module flows into the heat exchanger through the reversing valve to be cooled and then flows out of the hot water outlet.

Optionally, mix and be connected the water mixing pipeline between the entry of water outlet and water treatment filter core, the export of water treatment filter core is through filter core export pipeline and outlet pipe way intercommunication, water purification system still includes the pure water backward flow valve, the pure water backward flow valve is connected between filter core export pipeline and water mixing pipeline, the pure water backward flow valve is suitable for and switches on when the purifier is opened, filter in leading into the water treatment filter core through water mixing pipeline with the water of storing in the filter core export pipeline, and the pure water backward flow valve is closed at the stable working process of purifier.

The utility model has the advantages of it is following:

the pure water is prepared by the water purification system, the pure water is heated by the hot water system connected to the water outlet pipeline to obtain hot water, and the flow of the pure water entering the hot water system is adjusted by arranging the flow adjusting device between the hot water system and the water outlet pipeline, so that the flow of the pure water entering the hot water system is ensured to be within the bearing range of the hot water system, the heating capacity of the heating system is adapted, and the situation that the pure water cannot be completely heated due to overlarge flow of the pure water is prevented; meanwhile, the backflow branch can directly guide the redundant pure water in the water outlet pipeline back to the water inlet pipeline, the pure water which flows back to the water inlet pipeline participates in the filtration of the water purification system again, a water storage tank for storing the redundant pure water in the water outlet pipeline is not required to be additionally arranged, a water suction pump for pumping water from the water storage tank is not required to be arranged, the number of parts is reduced, the volume is favorably reduced, and the noise is lower; open at water purification system during operation through setting up the switch unit, switch on the backward flow branch road, in order to flow back unnecessary pure water among the outlet conduit to the inlet channel, and close at water purification system stop work, turn off the backward flow branch road, in order to block outlet conduit and inlet channel, prevent that the pure water from circulating always and making water purification system not shut down in water purification system, thereby guarantee that the system in time shuts down when stop work, and stability is improved, and the switch unit is convenient for operate, easily control, be favorable to promoting user experience.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a flow control system according to a first embodiment of the present invention;

FIG. 2 shows an enlarged partial schematic view of portion A of the flow control system of FIG. 1;

FIG. 3 is an enlarged partial schematic view of portion B of the flow control system of FIG. 1;

fig. 4 shows a schematic structural diagram of a heat exchanger according to an embodiment of the present invention;

FIG. 5 shows an exploded schematic view of the heat exchanger of FIG. 4;

fig. 6 shows a schematic structural view of a heating module according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a flow control system according to a second embodiment of the present invention;

fig. 8 shows a schematic cross-sectional view of a switching flow valve in an open state according to a second embodiment of the invention;

fig. 9 shows a schematic cross-sectional view of a closed state switching flow valve according to a second embodiment of the present invention;

fig. 10 is a schematic structural view of a housing of a switching flow valve according to a second embodiment of the present invention;

fig. 11 shows a schematic structural diagram of a flow control unit of a switching flow valve according to a second embodiment of the present invention.

Description of reference numerals:

101. a raw water inlet; 102. a purified water outlet; 103. a concentrated water outlet; 11. a water inlet pipeline; 111. a water mixing pipeline; 12. a water outlet pipeline; 120. a filter element outlet pipeline; 121. a pure water branch; 122. a hot water branch; 131. a water treatment filter element; 132. a front filter element; 133. a post-positioned filter element; 141. a water inlet valve; 142. a waste water valve; 143. a water purifying valve; 144. a pure water reflux valve; 145. a wastewater return valve; 151. a pure water check valve; 152. a waste water check valve; 153. a first water purification check valve; 154. a second water purification check valve; 16. a flow meter; 17. a pressure switch; 18. a pressure stabilizing pump; 21. a heating module; 211. heating the water inlet; 212. heating the water outlet; 22. a heat exchanger; 221. a first water inlet; 222. a first water outlet; 223. a second water inlet; 224. a second water outlet; 225. an inner tube; 226. an outer tube flow channel; 23. a diverter valve; 24. a hot water outlet; 25. a temperature sensing bulb; 26. adjusting a valve; 27. a hot water check valve; 30. a flow regulating device; 40. a reflux branch; 41. a backflow check valve; 50. switching a flow valve; 51. a switch unit; 511. a pure water inlet; 512. a pure water outlet; 513. a reflux inlet; 514. a switch valve core; 52. a flow control unit; 521. a raw water inlet; 522. a mixed water outlet; 523. a return outlet; 53. a return channel; 54. a fixed seat; 55. a gasket seal.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1 to 6, the water purifier of the present embodiment includes: the water purification system comprises a water inlet pipeline 11, a water treatment filter element 131 and a water outlet pipeline 12 which are sequentially connected, and is suitable for preparing pure water; the hot water system is connected to the water outlet pipeline 12 to heat pure water and discharge hot water; the flow regulating device 30 is connected between the hot water system and the water outlet pipeline 12 to regulate the flow of pure water entering the hot water system from the water outlet pipeline 12; one end of the return branch 40 is connected between the water outlet pipeline 12 and the flow regulator 30, and the other end is communicated with the water inlet pipeline 11, so as to guide the surplus pure water in the water outlet pipeline 12, which does not enter the hot water system, into the water inlet pipeline 11; the switching unit 51 has an open state of turning on the backflow branch line 40 when the water purification system is in operation and a closed state of turning off the backflow branch line 40 when the water purification system is out of operation.

By applying the water purifier of the embodiment, pure water is prepared through the water purification system, the pure water is heated by the hot water system connected to the water outlet pipeline 12 to obtain hot water, and the flow of the pure water entering the hot water system is adjusted by arranging the flow adjusting device 30 between the hot water system and the water outlet pipeline 12 to ensure that the flow of the pure water entering the hot water system is within the bearable range of the hot water system, so as to adapt to the heating capacity of the heating system and prevent the situation that the pure water cannot be completely heated due to overlarge flow of the pure water; meanwhile, the backflow branch 40 can directly guide the redundant pure water in the water outlet pipeline 12 back to the water inlet pipeline 11, and the pure water flowing back to the water inlet pipeline 11 participates in the filtration of the water purification system again, so that a water storage tank for storing the redundant pure water in the water outlet pipeline 12 is not required to be additionally arranged, a water suction pump for pumping water from the water storage tank is not required to be arranged, the number of parts is reduced, the volume is favorably reduced, and the noise is lower; open at water purification system during operation through setting up switch unit 51, switch on backward flow branch road 40, in with unnecessary pure water backward flow in outlet pipe 12 to the inlet pipe 11, and close at water purification system stop work, turn off backward flow branch road 40, in order to block outlet pipe 12 and inlet pipe 11, prevent that the pure water from circulating always and making water purification system not shut down in water purification system, thereby guarantee that the system in time shuts down when the stop work, and stability is improved, and switch unit 51 is convenient for operate, easy control, be favorable to promoting user experience.

It should be noted that the water inlet pipeline 11 has a raw water inlet 101, the water outlet pipeline 12 has a purified water outlet 102, the water treatment filter element 131 is used for filtering raw water to obtain purified water, and the water treatment filter element 131 may be one or more of an RO membrane filter element, an ultrafiltration membrane filter element, a ceramic membrane filter element, and a nanofiltration membrane filter element. The water purification system also comprises a preposed filter element 132 and a postposition filter element 133, wherein the preposed filter element 132 and the postposition filter element 133 are integrated into a composite filter element, the preposed filter element 132 is in the form of PAC filter element or PP plus preposed active carbon or other filter elements, and the postposition filter element 133 is in the form of active carbon filter element or ultrafiltration plus postposition active carbon or other filter elements; the composite filter element water route sets up to two into two forms of going out, raw water flows in from raw water inlet 101, advance through leading filter element 132 carry out the preliminary treatment, impurity such as silt, rust, solid pollutant in the filtration aquatic, then flow into water treatment filter element 131 through inlet channel 11 and carry out filtration treatment, tiny pollutant such as bacterium in the filtration aquatic, virus, the water purification after the filtration treatment further filters through rearmounted filter element 133 after flowing out from water treatment filter element 131, adsorb remaining peculiar smell in the aquatic, heterochrosis etc. improve the taste, obtain the pure water, finally discharge the pure water by outlet conduit 12.

Preferably, a backflow check valve 41 is disposed on the backflow branch 40 to prevent the water in the backflow branch 40 from flowing backwards, thereby improving the stability of the system.

In this embodiment, the pressure value in the water outlet pipeline 12 varies according to the flow rate of pure water entering the hot water system, when the pure water outlet 102 is closed, the pressure value in the water outlet pipeline 12 is the pressure value in the hot water branch 122, when the flow rate of pure water entering the hot water system decreases, the amount of residual pure water in the water outlet pipeline 12 increases, and then the pressure value in the water outlet pipeline 12 increases, and when no pure water enters the hot water system, the pressure value in the water outlet pipeline 12 increases to exceed the preset pressure value; when the flow rate of pure water entering the hot water system is increased, the amount of the residual pure water in the water outlet pipeline 12 is reduced, and the pressure value in the water outlet pipeline 12 is reduced; when the pressure value in the water outlet pipeline 12 is greater than the preset pressure value, no hot water is required to be produced, and the pure water in the water outlet pipeline 12 does not need to flow back, and the switch unit 51 is in a closed state, so that the return branch 40 is turned off; when the pressure value in the water outlet pipeline 12 is less than or equal to the preset pressure value, specifically, when the pressure value in the hot water branch 122 is less than or equal to the preset pressure value, the hot water system is in the working state, and there is a situation that there is excess pure water in the water outlet pipeline 12 during the heating process, at this time, the switch unit 51 is in the open state to conduct the backflow branch 40, so that excess pure water in the water outlet pipeline 12, which does not enter the hot water system, is guided into the water inlet pipeline 11. Wherein, the preset pressure value is the value that sets for in advance, and when water purification system stabilized work, the pressure value in the pipeline is not higher than the preset pressure value, and the preset pressure value is preferred 0.25Mpa.

Preferably, an intelligent faucet is arranged at the hot water outlet 24 at the end of the hot water system, and according to whether hot water is required to be produced, whether the flow regulating device 30 is turned on is controlled by the intelligent faucet, and when water is required to be produced, the flow regulating device 30 is turned on, and a part of pure water in the hot water branch 122 of the water outlet pipeline 12 enters the hot water system through the flow regulating device 30, and due to the limitation of the flow allowed by the flow regulating device 30, redundant pure water is led into the water inlet pipeline 11 after flowing through the return branch 40 via the switch unit 51 in an open state; when the heating water is not needed, the flow regulator 30 is closed, and the pure water in the hot water branch 122 cannot enter the hot water system through the flow regulator 30, at this time, the switch unit 51 is closed, and the return branch 40 is not conducted.

In this embodiment, the switch unit 51 has a pure water inlet 511, a pure water outlet 512, and a backflow inlet 513, wherein the pure water inlet 511 is connected to the water outlet pipe 12, the pure water outlet 512 is connected to the flow regulator 30, and the backflow inlet 513 is connected to one end of the backflow branch 40. The pure water inlet 511 and the pure water outlet 512 are both connected to the hot water branch 122 of the water outlet pipeline 12, the pure water outlet 512 is close to the direction in which the flow regulator 30 is installed on the hot water branch 122, specifically, the switch unit 51 is a switch valve, a switch valve core 514 is installed in the switch valve, when the flow regulator 30 is turned on, the switch valve core 514 is opened, the redundant pure water in the hot water branch 122 flows into the return branch 40 through the pure water inlet 511 and the return inlet 513, and when the flow regulator 30 is turned off, the pressure at the pure water outlet 512 is increased, the switch valve core 514 moves in the direction far from the pure water outlet 512 under the action of the pressure, the switch valve core 514 is turned off, so that the switch unit 51 is turned off, and the return branch 40 is not conducted.

In this embodiment, the water purifier further comprises a flow control unit 52, wherein the flow control unit 52 controls the flow of the water inlet pipeline 11 according to the flow of the water return branch 40, so that the flow of water entering the water treatment filter element 131 is constant. Specifically, when the return branch 40 is turned on, the surplus pure water in the water outlet pipeline 12 is guided to the flow control unit 52 through the return branch 40, the raw water in the water inlet pipeline 11 and the pure water in the return branch 40 are mixed to enter the mixed water pipeline 111, so that the flow control unit 52 controls the amount of the raw water in the water inlet pipeline 11 to decrease, and when the return branch 40 is turned off, no water in the return branch 40 flows to the flow control unit 52, so that the amount of the raw water in the flow control unit 52 that controls the flow of the water inlet pipeline 11 increases, and the total amount of the raw water in the mixed water pipeline 111 that is introduced from the water inlet pipeline 11 is controlled by the flow control unit 52 according to the flow of the return branch 40, so that the water flow in the mixed water pipeline 111 is constant, that is, the water flow entering the water treatment filter element 131 is constant, to maintain the stability of the water purification capability of the water purification system.

In this embodiment, the flow control unit 52 has a raw water inlet 521, a mixed water outlet 522 and a return outlet 523, the raw water inlet 521 is communicated with the water inlet pipeline 11, the mixed water outlet 522 is communicated with the water treatment filter element 131, and the return outlet 523 is connected with the other end of the return branch 40, where the other end of the return branch refers to one end of the return branch 40 far away from the return inlet 513, and the return outlet 523 is connected with the return inlet 513 via the return branch 40. The flow control unit 52 controls the flow of raw water at the raw water inlet 521 according to the pressure of pure water at the return outlet 523, when the return branch 40 is turned on, the pressure of the return outlet 523 increases, the flow control unit 52 controls the flow of raw water at the raw water inlet 521 to decrease, and when the return branch 40 is turned off, the pressure of the return outlet 523 decreases, the flow control unit 52 controls the flow of raw water at the raw water inlet 521 to increase, so as to ensure that the water flow at the outlet 522 of the mixed water outlet is constant, thereby ensuring the stability of the water purification system. Specifically, the flow control unit 52 is a flow control valve, a movable fixing seat 54 and a sealing gasket 55 moving along with the fixing seat 54 are arranged in the flow control valve, when the pressure at the backflow outlet 523 is increased, the water pressure pushes the fixing seat 54 to move towards the direction close to the raw water inlet 521, so that the valve core opening is reduced, and the raw water inlet amount is reduced.

In this embodiment, the flow regulating device 30 is a stepless speed regulating valve, and the stepless speed regulating valve can accurately control the water flow, so as to adapt to the heating capacities of the heating modules 21 with different powers, and when the heating capacities of the heating modules are stronger, the stepless speed regulating valve can regulate the water flow by controlling the size of the valve core opening of the stepless speed regulating valve, so that the application is convenient, and the practicability is high.

It should be noted that, in order to adapt to a large-flow water purifier (the purified water flow is more than 1.5L/min), a water tank needs to be placed inside the water purifier, and then a small water pump pumps water from the water tank, so as to accurately control the water flow (0.3-1.5L/min) entering the heating system for the small water pump, wherein the water tank has the buffer effect, so that the flow speed is prevented from being too fast, the purified water is discharged without being heated under the condition that the power of the heating module is limited, and the small water pump has the effect of accurately controlling the flow. And this embodiment need not to set up water tank and little water pump, and backward flow branch 40 has played the cushioning effect equally, and concrete theory of operation is: q =2.5L/min (for example) of pure water flowing into the hot water branch 122, the stepless regulating valve controls the size of the through hole thereof by a program, and further controls the flow Q1=0.3L/min (for example) flowing into the heating system, and the function of the stepless regulating valve is equivalent to the function of accurately controlling the flow of a small water pump; because the through hole of the stepless regulating valve is reduced, the water flow flowing past is reduced, and the pressure in front of the valve of the stepless regulating valve is increased (the smaller the through hole is regulated, the smaller the past flow is, the higher the pressure in front of the valve is), the switch unit 51 is opened, and at this time, redundant pure water Q2=2.5-0.3=2.2l/min (for example) flows into the return branch 40 from the switch unit 51, and then flows back to the pre-filter element 132 in the water purification system, and then the pure water in the return branch 40 is mixed with the raw water in the water inlet pipeline 11 and enters the water mixing pipeline 111, and flows to the water treatment filter element 131 for filtration treatment after being pressurized by the pressure stabilizing pump 18, and the flow control unit 52 controls and reduces the flow in the raw water inlet pipeline 11 according to the pressure on the return branch 40, so that the total flow entering the water purification system is unchanged, and the system is ensured to be stable.

In the present embodiment, the water outlet pipe 12 includes a pure water branch 121 and a hot water branch 122, the pure water branch 121 selectively discharges pure water, when the pure water outlet 102 is opened, the pure water branch 121 discharges pure water, and when the pure water outlet 102 is closed, the pure water branch 121 does not discharge pure water; the hot water branch 122 is communicated with a hot water system, one end of the backflow branch 40 is connected to the hot water branch 122, and the flow regulating device 30 is arranged on the hot water branch 122, so that the backflow branch 40 guides redundant pure water which is not introduced into the hot water system and is in the hot water branch 122 to the water inlet pipeline 11.

In this embodiment, the water purifier further includes a pressure switch 17, the pressure switch 17 is disposed on the pure water branch 121 of the water outlet pipeline 12, and the pressure switch 17 turns off the water purifying system when detecting that the pressure value in the water outlet pipeline 12 is greater than the preset pressure value. The pressure switch 17 is used for detecting the pressure value in the water outlet pipeline 12 and controlling the water purification system to be closed when the pressure value in the water outlet pipeline 12 is larger than the preset pressure value, so that the detection result is reliable and the automation degree is high. It should be noted that, when the water purification system stops working, neither pure water flows out of the water purification outlet 102 nor the water purification system heats water, the return branch 40 needs to be closed, so that pure water in the water outlet pipeline 12 does not return to the water inlet pipeline 11 any more, after the return branch 40 is closed, the system pressure is maintained at above 0.25Mpa, and the pressure switch 17 detects a high pressure, so that the system stops working. The switch unit 51 is switched to the off state, so that the backflow branch 40 is turned off, if the switch unit 51 is not provided, the backflow branch 40 cannot be turned off, pure water is circulated in the system all the time, and the system is not stopped.

In this embodiment, the hot water system further includes a heating module 21, a heat exchanger 22, a reversing valve 23 and a hot water outlet 24, the heating module 21 is communicated with the heat exchanger 22, the flow rate adjusting device 30 and the reversing valve 23, the heat exchanger 22 is communicated with the flow rate adjusting device 30, the reversing valve 23 and the hot water outlet 24, the reversing valve 23 is a one-inlet two-position reversing valve, the reversing valve 23 has a first working position and a second working position, when the reversing valve 23 is in the first working position, the hot water flowing out of the heating module 21 flows out from the hot water outlet 24 through the reversing valve 23, and when the reversing valve 23 is in the second working position, the hot water flowing out of the heating module 21 flows into the heat exchanger 22 through the reversing valve 23 to be cooled and then flows out from the hot water outlet 24. The water outlet mode is controlled through the reversing valve 23, so that the control is convenient, the reliability is high, and the improvement of the user experience is facilitated. Wherein, heating module 21 is used for heating the pure water in the pipeline, and preferably, heating module 21 is instant heating module, can be fast with the pure water heating, and the programming rate is fast, and user experience is good.

It should be noted that, the heat exchanger 22 is a cooling module, the heat exchanger 22 has an inner tube 225 and an outer tube flow passage 226, the inner tube 225 has a first water inlet 221 and a first water outlet 222, the outer tube flow passage 226 has a second water inlet 223 and a second water outlet 224, unheated pure water flowing through the flow regulator 30 flows into the outer tube flow passage 226 through the second water inlet 223, and then enters the heating module 21 after being discharged from the second water outlet 224, when the reversing valve 23 is in the second working position, hot water flowing out of the heating module 21 passes through the reversing valve 23, enters the inner tube 225 through the first water inlet 221, and then is discharged to the hot water outlet 24 through the first water outlet 222, in this process, the hot water in the inner tube 225 exchanges heat with cold water in the outer tube flow passage 226, so that the temperature of the hot water discharged from the first water outlet 222 is reduced, and an effect of reducing the temperature of the hot water is achieved. Preferably, the hot water system further comprises an adjusting valve 26, the adjusting valve 26 is disposed on the pipeline between the second water inlet 223 and the second water outlet 224, and two ends of the pipeline are communicated with the flow regulating device 30 and the heating module 21, the opening size of the adjusting valve 26 can be adjusted according to the selected outlet water temperature according to the control of the intelligent faucet at the hot water outlet 24, the lower the temperature of the cooled hot water flowing out of the hot water outlet 24 is, the smaller the opening of the adjusting valve 26 is, the more cold water is diverted to enter the heat exchanger 22, and the better the cooling effect is.

Specifically, pure water in the hot water branch 122 enters the heating module 21 from the heating water inlet 211 to be heated, and then flows out from the heating water outlet 212, and the hot water flows out and then is divided into two situations: one is that when a user wants to take boiled water, the reversing valve 23 controls hot water to directly flow out from the hot water outlet 24; in the second case, when the user takes water with 45 deg.c, 55 deg.c, 85 deg.c, the boiled water enters the inner pipe 225 of the heat exchanger 22 and exchanges heat with the cold water flowing through the outer pipe flow passage 226, and the temperature of the cold water and the hot water after heat exchange is calculated by the heat transfer formula and is related to the inner and outer pipe diameters, the pipe length and the flow rate, so that the temperature of the boiled water can be controlled by these parameters, wherein the boiled water is naturally cooled to a temperature (generally 45 deg.c) at which the boiled water can be directly drunk after being boiled. Wherein, the design of heat exchange water route does: the pure water flows through the outer tube flow passage 226 of the heat exchanger 22 → the heating module 21 → the inner tube 225 of the heat exchanger 22, on the same water path, the heat exchanger 22 realizes the preheating and cooling functions of the water at the same time, and the heating module 21 heats the water after the water temperature rises (preheats) through the heat exchange in the heat exchanger 22 before the cold water enters the heating module 21, thereby improving the heating efficiency. The principle of preheating the increase heating rate of the heating module 21 is: before entering the heating module 21, the water is preheated to a certain temperature, so that the heat required for heating to the same temperature is less, the flow rate of the water can be faster, and the flow of the heating module 21 is indirectly improved, so that the heating efficiency is improved, for example, after preheating, the cold water is heated from 20 ℃ to 50 ℃, and at the moment, the heating module can heat the water to 90 ℃ more quickly.

In this embodiment, the water mixing pipeline 111 is connected between the water mixing outlet 522 and the inlet of the water treatment filter element 131, the outlet of the water treatment filter element 131 is communicated with the water outlet pipeline 12 through the filter element outlet pipeline 120, the water purification system further includes a pure water backflow valve 144, the pure water backflow valve 144 is connected between the filter element outlet pipeline 120 and the water mixing pipeline 111, the pure water backflow valve 144 is suitable for being turned on when the water purification machine is turned on, so as to introduce the water stored in the filter element outlet pipeline 120 into the water treatment filter element 131 through the water mixing pipeline 111 for filtration, and the pure water backflow valve 144 is turned off during the stable operation of the water purification machine. It should be noted that, when the water purifying machine is started, a certain amount of water stored in the pipeline during last use is stored, and the water is not pure water after a period of time, if the water purifying machine is directly started, the first cup of water received by the user is not pure water, and in order to ensure that the first cup of water received by the user is discharged water, the last water remaining in the pipeline needs to be treated, the pure water reflux valve 144 is arranged to be connected between the filter element outlet pipeline 120 and the water mixing pipeline 111, so that the last water remaining in the filter element outlet pipeline 120 can be reintroduced into the water treatment filter element 131 for filtration, and in the stable working process of the water purifying machine, the last water is not used, and therefore the pure water reflux valve 144 can be closed. Preferably, a pure water check valve 151 is further connected between the pure water return valve 144 and the mixed water pipeline 111 to prevent water in the mixed water pipeline 111 from directly flowing into the filter element outlet pipeline 120 through the pure water return valve 144, so as to ensure the filtering effect. Similarly, a waste water return valve 145 is connected between the concentrate outlet 103 and the mixed water pipeline 111 to re-filter the residual concentrate left in the concentrate pipeline during the previous use.

Preferably, the water purification system further comprises: the water inlet valve 141 is arranged on the water mixing pipeline 111 and is used for controlling the on-off of the water mixing pipeline 111, and the flow meter 16 is used for counting water flow; a waste water valve 142 arranged on the concentrated water pipeline to control the on-off of the concentrated water pipeline; a pure water valve 143 disposed on the pure water branch 121 to control the on-off of the pure water branch 121; a wastewater check valve 152 disposed between the wastewater return valve 145 and the mixing water line 111 to prevent the backflow of the concentrate in the concentrate line; a first water purification check valve 153 arranged at the water outlet of the post-filter element 133 to prevent the pure water in the water outlet pipeline 12 from flowing backwards; a second purified water check valve 154 provided between the purified water valve 143 and the purified water outlet 102 to prevent the reverse flow of the purified water at the purified water outlet 102. The hot water system further comprises: a hot water check valve 27 is provided before the hot water outlet 24 to prevent the reverse flow of the hot water at the hot water outlet 24.

Example two

As shown in fig. 7 to 11, a water purifying machine according to the second embodiment is different from the water purifying machine according to the first embodiment in that a switch unit 51 and a flow control unit 52 are integrated into a switch flow valve 50, and a return branch 40 is a return channel 53 disposed inside the switch flow valve 50. By integrating the switch unit 51 and the flow control unit 52, the overall structure is more compact and the volume is smaller.

In this embodiment, the pure water inlet 511, the pure water outlet 512, the raw water inlet 521, and the mixed water outlet 522 are integrated on the on-off flow valve 50, so that the number of connecting pipes is reduced, and the risk of water leakage is reduced.

In this embodiment, the on-off flow valve 50 is a pressure-stabilizing return valve that keeps the pressure at the mixed water outlet 522 stable, and has high reliability.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

by arranging the backflow branch circuit 40, the switch unit 51 and the flow control unit 52 to be matched, one water tank is reduced, the size of the water purifier can be designed to be smaller, and the water purifier can be more easily placed into a cabinet; secondly, a water suction pump is not needed, and the noise is reduced.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A water purifier, comprising:

the water purification system comprises a water inlet pipeline (11), a water treatment filter element (131) and a water outlet pipeline (12) which are connected in sequence, and the water purification system is suitable for preparing pure water;

a hot water system connected to the water outlet pipe (12) to heat the pure water and discharge the hot water;

a flow regulating device (30) connected between the hot water system and the water outlet pipeline (12) for regulating the flow of pure water from the water outlet pipeline (12) into the hot water system;

a return branch (40), one end of which is connected between the water outlet pipeline (12) and the flow regulating device (30) and the other end of which is communicated with the water inlet pipeline (11), so as to guide the surplus pure water in the water outlet pipeline (12) which does not enter the hot water system into the water inlet pipeline (11);

and the switch unit (51) is provided with an opening state for conducting the backflow branch (40) when the water purification system works and a closing state for cutting off the backflow branch (40) when the water purification system stops working.

2. The water purification machine according to claim 1, wherein the pressure value in the water outlet pipe (12) varies according to the flow rate of pure water entering the hot water system, the switch unit (51) is in a closed state when the pressure value in the water outlet pipe (12) is greater than a preset pressure value, and the switch unit (51) is in an open state when the pressure value in the water outlet pipe (12) is less than or equal to the preset pressure value.

3. The water purification machine according to claim 2, further comprising a flow control unit (52), said flow control unit (52) controlling the flow of said water inlet line (11) according to the flow of said return branch (40) so as to make the flow of water entering the water treatment cartridge (131) constant.

4. The water purification machine according to claim 3, wherein the switch unit (51) has a pure water inlet (511), a pure water outlet (512) and a return inlet (513), the pure water inlet (511) being connected to the water outlet line (12), the pure water outlet (512) being connected to the flow regulation device (30), the return inlet (513) being connected to one end of the return branch (40); the flow control unit (52) is provided with a raw water inlet (521), a mixed water outlet (522) and a backflow outlet (523), the raw water inlet (521) is communicated with the water inlet pipeline (11), the mixed water outlet (522) is communicated with the water treatment filter element (131), and the backflow outlet (523) is connected with the other end of the backflow branch (40).

5. Water purification machine according to claim 4, wherein the switching unit (51) and the flow control unit (52) are integrated into one switching flow valve (50), the return branch (40) being a return channel (53) arranged inside the switching flow valve (50).

6. The water purification machine according to claim 5, wherein the switching flow valve (50) is a pressure-regulated return valve keeping the pressure at the mixed water outlet (522) constant.

7. Water purifier according to any one of claims 1 to 6, wherein the flow regulating means (30) is a stepless speed regulating valve.

8. The water purification machine according to any one of claims 1 to 6, wherein the water outlet circuit (12) comprises a pure water branch (121) and a hot water branch (122), the pure water branch (121) being able to selectively discharge the pure water; the hot water branch (122) is communicated with the hot water system, one end of the return branch (40) is connected to the hot water branch (122), and the flow regulating device (30) is arranged on the hot water branch (122).

9. The water purifier according to any one of claims 1-6, wherein the hot water system further comprises a heating module (21), a heat exchanger (22), a reversing valve (23), and a hot water outlet (24), wherein the heating module (21) is in communication with the heat exchanger (22), the flow regulating device, the reversing valve (23), the heat exchanger (22) is in communication with the flow regulating device, the reversing valve (23), and the hot water outlet (24), the reversing valve (23) is in communication with the hot water outlet (24), the reversing valve (23) has a first operating position and a second operating position, when the reversing valve (23) is in the first operating position, the hot water flowing out of the heating module (21) flows out of the hot water outlet (24) through the reversing valve (23), and when the reversing valve (23) is in the second operating position, the hot water flowing out of the heating module (21) flows into the heat exchanger (22) through the reversing valve (23) for temperature reduction, and then flows out of the hot water outlet (24).

10. The water purification machine according to any one of claims 4 to 6, wherein a water mixing line (111) is connected between the water mixing outlet (522) and the inlet of the water treatment cartridge (131), wherein the outlet of the water treatment cartridge (131) communicates with the water outlet line (12) via the cartridge outlet line (120), wherein the water purification system further comprises a pure water return valve (144), wherein the pure water return valve (144) is connected between the cartridge outlet line (120) and the water mixing line (111), wherein the pure water return valve (144) is adapted to be opened when the water purification machine is opened to introduce the water stored in the cartridge outlet line (120) into the water treatment cartridge (131) via the water mixing line (111) for filtration, and wherein the pure water return valve (144) is closed during steady operation of the water purification machine.

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