Domestic water purification system

Abstract

The utility model relates to a domestic water purification system which comprises a water inlet valve, a pipe-in-pipe pipeline, a first purifier and / or a second purifier and a plurality of water utilization facilities, when the water-using facility is put into operation, domestic water enters the water inlet pipeline through the water inlet valve, then enters the inner flow channel of the pipe-in-pipe pipeline, then is subjected to pressure relief and flows into the water-using facility in use, and the domestic water entering the water inlet pipeline through the water inlet valve enters the outer flow channel of the pipe-in-pipe pipeline through the water inlet bypass pipeline and the first purifier, is subjected to pressure relief and flows into the water-using facility in use; domestic water flows from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel and the inner flow channel of the pipe-in-pipe pipeline of a water utilization facility which is not put into use, so that running water flowing circulation of the whole pipe-in-pipe pipeline is formed. According to the utility model, the purifier is adopted to remove impurities, harmful ions and bacteria in domestic water, so that the water supply quality of domestic water can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to domestic water technology field especially uses a kind of domestic water purification system of purification water circulation technology. BACKGROUND

[0002] With the improvement of people's living standards, the requirement for the quality of life is also getting higher and higher, such as water quality.

[0003] The pipeline of general domestic water is composed of one main pipeline into the house and multiple branches distributed to each room. As we all know, when a branch is out of water, the water inside the pipeline usually only passes through the main pipeline and the branch to reach the user end, and the water in other branches is in a relatively static state. If the water in the branch is not used for a long time, it is easy to deteriorate and breed bacteria, which is harmful to the health of the user.

[0004] Solar water heating system is the main form of solar heat utilization in China. It is a device that uses solar energy to heat water and store it in a water tank for use.

[0005] Taking a common household straight-in solar vacuum water heater as an example, when it works, the vacuum tube is filled with water, which mainly plays a heat conduction role and cannot flow completely, similar to "dead water". After a period of use, scale will accumulate at the bottom of the vacuum tube, which contains organic matter. When the water temperature is between 30°C and 60°C, it is a good condition for bacteria to breed, which may cause a large number of bacteria to multiply. At the same time, nitrite is easy to accumulate in the vacuum tube, which is a carcinogenic substance harmful to the human body. The above phenomena lead to serious secondary pollution of household straight-in solar water heaters, including bacterial breeding, heavy metal exceeding standard, scale accumulation, nitrite exceeding standard, etc. Therefore, the water heated by the solar water heater cannot be directly drunk, even if it is used for bathing, it may also cause or induce a series of diseases, such as skin itching, gynecological diseases, and pediatric hand-foot diseases. This problem is particularly serious in rural areas. In rural areas, because many places use surface water or even river water as the water source for solar water heaters, the water quality is complex, which requires the hot water system not only to have the function of heating water, but also to have the functions of filtering, sterilizing, removing harmful substances, and adjusting water quality.

[0006] Chinese patent CN202021346507.X - a circulating water system discloses a circulating water system, which comprises a pipe-in-pipe and a pipe joint. The end of the pipe-in-pipe pipeline is connected to a liquid outlet device through a tail valve. The inner cavity of the tail valve is connected to the inner flow channel and the outer flow channel. This technical solution can promote the regular circulation of liquid between the inner flow channel and the outer flow channel through the setting of circulating pump, filter, sterilizer and tail valve, inhibit and reduce the breeding of bacteria, ensure the cleanliness and hygiene of water source, and has excellent application effect.Figure 2 However, there is still room for further optimization, such as avoiding cavitation of the circulating pump, simplifying the system, improving the flexible operation ability of the system, etc.

[0007] Chinese patent CN202310482556.8-passive differential pipe-in-pipe liquid outlet system discloses a pipe-in-pipe liquid outlet system, which includes a main pipe, a total water inlet valve, a plurality of branches, a differential pressure liquid inlet valve core, a plurality of differential pressure liquid outlet valve cores, and a plurality of water outlet devices. When one or more of the branches are opened, the pressure difference between the inner flow channel and the outer flow channel is generated due to the presence of the differential pressure liquid inlet valve core and the differential pressure liquid outlet valve core, and the pressure of the inner flow channel is higher than that of the outer flow channel, so that the liquid in the inner flow channel can flow back to the outer flow channel through the corresponding pipe outlet end in the remaining branches, and finally flow out through the pipe outlet end of the opened water outlet device. The internal water of all branches of the system can flow at any time, preventing the occurrence of dead water and deteriorated water, as shown in the accompanying Figure 3 However, there is still room for optimization, such as the impurities in the water not being removed, the need to use a differential pressure control valve core, etc.

[0008] Chinese patent CN201922497721.9-directional hot water circulation control system discloses a hot water circulation control system, which includes a hot water source, a circulating pump, a starting valve and a pipe-in-pipe pipe connected in sequence, and a pipe-in-pipe backflow valve is arranged on the pipe-in-pipe pipe. The opening size of the inner flow channel or the outer flow channel of the pipe-in-pipe pipe is controlled by adjusting the valve head, and directional circulation of the pipe-in-pipe pipe is realized. The size of the inner flow channel or the outer flow channel is controlled by adjusting the valve head, and when the inner flow channel or the outer flow channel is blocked, single-flow channel liquid outlet and directional flow can be realized. In the pipe-in-pipe pipe, the inner and outer flow channels are blocked, so they do not participate in circulation, which can save a large part of energy wasted due to circulation. When the inner and outer flow channels are opened, liquid circulation backflow can be realized, as shown in the accompanying Figure 5 However, there is still room for optimization, such as the impurities in the water not being removed, the need to use a differential pressure control valve core, etc.

[0009] Therefore, how to select a suitable domestic water purification system to improve the quality of domestic water is worth further studying. SUMMARY

[0010] The utility model aims at solving above-mentioned problem, provides a kind of domestic water purification system, adopts pipe-in-pipe water circulation purification technology, effectively eliminates the impurities, harmful ions in domestic water and the bacteria breeding in domestic water, achieves the purpose of improving water quality.

[0011] A domestic water purification system comprises:

[0012] the water inlet valve 41, the pipe-in-pipe pipeline, the first purifier 44 and / or the second purifier 55, the plurality of water facilities,

[0013] The pipe-in-pipe pipeline comprises a pipe-in-pipe inner pipeline 46, a pipe-in-pipe outer pipeline 45 and a support frame 49 arranged between the inner pipeline and the outer pipeline,

[0014] The pipe-in-pipe inner pipeline 46 comprises an inner pipe and an inner pipe fitting, and the pipe-in-pipe outer pipeline 45 comprises an outer pipe and an outer pipe fitting,

[0015] The inner pipe fitting or the outer pipe fitting comprises an elbow, a tee, a cross, a reducer, a pipe cap (plug) and the like,

[0016] The support frame 49 adopts a hollow structure and is arranged between the pipe-in-pipe inner pipeline 46 and the pipe-in-pipe outer pipeline 45 of the pipe-in-pipe pipeline, and adopts a split or integrated structure with the pipe-in-pipe inner pipeline 46 or the pipe-in-pipe outer pipeline 45, wherein the integrated structure refers to that the support frame is cast together with the pipe-in-pipe inner pipeline 46 or the pipe-in-pipe outer pipeline 45, and various types of support frames in a conventional jacketed heat exchanger can be applied to the pipe-in-pipe pipeline of the present application,

[0017] When part of the water facilities are put into operation:

[0018] The domestic water flows into the water inlet pipeline 42 through the water inlet valve 41, then flows into the inner flow channel 48 of the pipe-in-pipe inner pipeline 46, and then flows into the water facilities put into operation,

[0019] The water inlet pipeline 42 is provided with a water inlet bypass pipeline 43: the domestic water flowing into the water inlet pipeline 42 through the water inlet valve 41 flows into the outer flow channel 47 of the pipe-in-pipe pipeline through the water inlet bypass pipeline 43 and the first purifier 44, and then flows into the water facilities put into operation, the first purifier 44 plays a throttling and pressure reducing role, a pressure difference is formed between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, and the water facilities not put into operation cause the domestic water to flow from a high-pressure flow channel to a low-pressure flow channel due to the pressure difference between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, thereby forming a circulating flow of the entire pipe-in-pipe pipeline;

[0020] Or the domestic water flows into the water inlet pipeline 42 through the water inlet valve 41, then flows into the second purifier 55, then flows into the inner flow channel 48 of the pipe-in-pipe inner pipeline 46, and then flows into the water facilities put into operation,

[0021] The water inlet pipeline 42 is provided with a water inlet bypass pipeline 43. Household water entering the water inlet pipeline 42 through the water inlet valve 41 flows into the outer flow channel 47 of the pipe-in-pipe pipeline through the water inlet bypass pipeline 43, and is discharged into the water using facility in use, the second purifier 55 simultaneously functions as a throttling pressure reducer, a pressure difference is formed between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, and the water using facility not in use causes the household water to flow from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, thereby forming a circulating flow of the household water in the entire pipe-in-pipe pipeline.

[0022] Or the household water enters the water inlet pipeline 42 through the water inlet valve 41, enters the second purifier 55, and then enters the inner flow channel 48 of the inner pipeline 46 of the pipe-in-pipe pipeline, and is discharged into the water using facility in use,

[0023] The water inlet pipeline 42 is provided with a water inlet bypass pipeline 43. Household water entering the water inlet pipeline 42 through the water inlet valve 41 flows into the outer flow channel 47 of the pipe-in-pipe pipeline through the water inlet bypass pipeline 43, and is discharged into the water using facility in use, the first purifier 44 and the second purifier 55 simultaneously function as a throttling pressure reducer, a pressure difference is formed between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, and the water using facility not in use causes the household water to flow from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, thereby forming a circulating flow of the household water in the entire pipe-in-pipe pipeline.

[0024] The household water includes tap water, hot water, underground water, etc.

[0025] Preferably, the support frame 49 of the pipe-in-pipe pipeline is provided with a plurality of throttling holes, which simultaneously function as a throttling device and support the inner and outer pipelines of the pipe-in-pipe pipeline.

[0026] Preferably, the connection between the pipe-in-pipe pipeline and the water using facility adopts a large lower head 53, which functions as a jet suction of the household water in the low-pressure flow channel.

[0027] The first purifier 44 and / or the second purifier 55 includes a filter, an ultraviolet sterilizer, an ozone sterilizer, a reverse osmosis membrane purifier, or a water softener (including a specific ion removal device, such as a chlorine ion, etc.).

[0028] The connection between the pipes, the connection between the pipes and the pipe fittings, and the connection between the pipe fittings in the pipe-in-pipe pipeline adopts welding, hot melt connection, expansion joint, or threaded connection.

[0029] The water using facility includes a faucet, a cold and warm faucet, a shower, a washing machine, a dishwasher, a hot water heater for heating, etc.

[0030] The pipe-in-pipe outer pipeline 45 of the pipe-in-pipe pipeline is provided with a support, which fixes the pipe-in-pipe pipeline.

[0031] When the first purifier 44 and the second purifier 55 are used at the same time, there is a pressure difference between the fluid in the inner flow channel 48 and the outer flow channel 47 of the pipe-in-pipe pipeline at the water-using facility.

[0032] Other supporting facilities of the household water purification system refer to or are matched according to reliable and mature technologies in the pipe-in-pipe pipeline.

[0033] Compared with the prior art, the household water purification system has the following advantages:

[0034] 1. Compared with the existing pipe-in-pipe water supply or hot water technology (CN202021346507.X-A kind of active water circulation system, CN202310482556.8-Passive pressure difference type pipe-in-pipe liquid outlet system, CN201922497721.9-A kind of directional hot water circulation control system, etc.), the process structure of the present application retains the advantages of the existing pipe-in-pipe water supply technology, and does not need to use a pressure difference control valve or a backflow valve. Through the setting of the purifier, the water supply quality of the domestic water can be effectively guaranteed, and the operation adjustment is flexible and convenient.

[0035] 2. Compared with the existing straight-in vacuum tube solar water supply system, the hot water in the present application is subjected to the action of the purifier, which can provide safe and sanitary hot water for multiple uses in life. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a household water purification system structure schematic diagram of the utility model.

[0037] Figure 1 In the figure: 41-inlet valve, 42-inlet pipeline, 43-inlet bypass pipeline, 44-first purifier, 45-pipe-in-pipe outer pipeline, 46-pipe-in-pipe inner pipeline, 47-outer flow channel, 48-inner flow channel, 49-supporting frame, 50-first water-using facility, 51-second water-using facility, 52-third water-using facility, 53-reducer, 54-reducer pipe joint, 55-second purifier.

[0038] Figure 2 It is a structure schematic diagram of CN202021346507.X-A kind of active water circulation system.

[0039] Figure 2 In the figure: 1-pipe-in-pipe pipeline, 2-circulation pipeline, 3-circulation start valve, 4-tail valve, 5-liquid outlet device, 6-inlet pipe, 11-pipe-in-pipe, 12-pipe joint, 21-circulation pipe, 22-circulation pump.

[0040] Figure 3 It is a structure schematic diagram of CN202310482556.8-Passive pressure difference type pipe-in-pipe liquid outlet system.

[0041] Figure 3 In the figure: 1-main line, 2-branch line, 3-differential pressure inlet valve core, 4-differential pressure outlet valve core, 5-water outlet device, 7-total water inlet valve, 11-pipeline liquid inlet end, 14-end pipe joint, 21-pipeline liquid outlet end.

[0042] Figure 4 is the annual increase of different types of solar collectors in China from 2004 to 2023 and the proportion of the area of the collector.

[0043] Figure 5 is a structural schematic diagram of a directional hot water circulation control system.

[0044] Figure 5 In the figure: 2-tube-in-tube pipeline, 100-tube-in-tube backflow valve, 200-hot water source, 300-circulating pump, 400-starting valve, 500-tap water pipeline, 600-controller, 700-manual delay switch, 800-sensing delay switch, 801-temperature probe. DETAILED DESCRIPTION

[0045] The utility model will be described in further detail below in combination with the drawings and specific embodiments. Figure 1 The utility model will be described in further detail below in combination with the drawings and specific embodiments.

[0046] Embodiment 1:

[0047] A domestic water purification system comprises:

[0048] A water inlet valve 41, a tube-in-tube pipeline, a first water purifier 44 and / or a second water purifier 55, a first water using facility 50, a second water using facility 51 and a third water using facility 52,

[0049] The tube-in-tube pipeline comprises a tube-in-tube inner pipeline 46, a tube-in-tube outer pipeline 45 and a support frame 49 arranged between the inner and outer pipelines, and the tube-in-tube pipeline uses a reducing pipe joint 54 to seal domestic water in an outer flow channel 47,

[0050] The tube-in-tube inner pipeline 46 comprises an inner pipe and an inner pipe fitting, and the tube-in-tube outer pipeline 45 comprises an outer pipe and an outer pipe fitting,

[0051] The inner pipe fitting or the outer pipe fitting comprises an elbow, a tee, a cross, a reducer, a pipe cap (plug) and the like,

[0052] The support frame 49 adopts a hollow structure, is arranged between the pipe-in-pipe inner pipeline 46 and the pipe-in-pipe outer pipeline 45 of the pipe-in-pipe pipeline, and adopts a split or integrated structure with the pipe-in-pipe inner pipeline 46 or the pipe-in-pipe outer pipeline 45. The integrated structure refers to that the support frame is cast together with the pipe-in-pipe inner pipeline 46 or the pipe-in-pipe outer pipeline 45. Various types of support frames in the traditional double-pipe heat exchanger can be applied to the pipe-in-pipe pipeline of the present application,

[0053] When part of the water facilities is put into operation:

[0054] The domestic water flows into the water inlet pipeline 42 through the water inlet valve 41, then flows into the inner flow channel 48 of the pipe-in-pipe inner pipeline 46, and then flows into the water facilities put into operation,

[0055] The water inlet pipeline 42 is provided with a water inlet bypass pipeline 43. The domestic water flowing into the water inlet pipeline 42 through the water inlet valve 41 flows into the outer flow channel 47 of the pipe-in-pipe pipeline through the water inlet bypass pipeline 43 and the first purifier 44, and then flows into the water facilities put into operation. The first purifier 44 plays a throttling and pressure reducing role. The pressure difference is formed between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline. The water facilities not put into operation cause the domestic water to flow from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, thereby forming the active water flow circulation of the entire pipe-in-pipe pipeline;

[0056] Or the domestic water flows into the water inlet pipeline 42 through the water inlet valve 41, the second purifier 55, and then the inner flow channel 48 of the pipe-in-pipe inner pipeline 46, and then flows into the water facilities put into operation,

[0057] The water inlet pipeline 42 is provided with a water inlet bypass pipeline 43. The domestic water flowing into the water inlet pipeline 42 through the water inlet valve 41 flows into the outer flow channel 47 of the pipe-in-pipe pipeline through the water inlet bypass pipeline 43, and then flows into the water facilities put into operation. The second purifier 55 plays a throttling and pressure reducing role. The pressure difference is formed between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline. The water facilities not put into operation cause the domestic water to flow from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, thereby forming the active water flow circulation of the entire pipe-in-pipe pipeline;

[0058] Or the domestic water flows into the water inlet pipeline 42 through the water inlet valve 41, the second purifier 55, and then the inner flow channel 48 of the pipe-in-pipe inner pipeline 46, and then flows into the water facilities put into operation,

[0059] The water inlet pipeline 42 is provided with a water inlet bypass pipeline 43: domestic water entering the water inlet pipeline 42 through the water inlet valve 41 enters the outer flow channel 47 of the pipe-in-pipe pipeline through the water inlet bypass pipeline 43 and the first purifier 44, and flows into the water using facility in use, the first purifier 44 and the second purifier 55 simultaneously play the role of throttling and pressure reduction, and the pressure difference is formed between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, and the domestic water flows from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel 47 and the inner flow channel 48 of the pipe-in-pipe pipeline, so that the active water flow circulation of the entire pipe-in-pipe pipeline is formed.

[0060] The domestic water includes tap water, hot water or underground water and the like.

[0061] Preferably, the support frame 49 of the pipe-in-pipe pipeline is provided with a plurality of throttling holes, which play the role of throttling and support the inner and outer pipelines of the pipe-in-pipe pipeline.

[0062] The first purifier 44 and / or the second purifier 55 include a filter, an ultraviolet sterilizer, an ozone sterilizer, a reverse osmosis membrane water purifier or a water softener (including a specific ion removal device, such as chlorine ion and the like).

[0063] The connection of the pipe and the pipe, the pipe and the pipe fitting, and the pipe fitting and the pipe fitting in the pipe-in-pipe pipeline adopts welding, hot melt connection, expansion joint or threaded connection.

[0064] The water using facility includes a faucet, a cold and warm faucet, a shower, a washing machine, a dishwasher, a hot water heater for heating and the like.

[0065] The outer pipeline 45 of the pipe-in-pipe pipeline of the pipe-in-pipe pipeline is provided with a support, which fixes the pipe-in-pipe pipeline.

[0066] When the first purifier 44 and the second purifier 55 are used simultaneously, there is a pressure difference between the fluid in the inner flow channel 48 and the outer flow channel 47 of the pipe-in-pipe pipeline at the water using facility.

[0067] Other supporting facilities of the domestic water purification system refer to or are matched according to the reliable and mature technology in the pipe-in-pipe pipeline.

[0068] Although the utility model has been disclosed as above with preferred embodiments, they are not intended to limit the utility model, and any person skilled in the art can make various changes or modifications without departing from the spirit and scope of the utility model, and the changes or modifications also belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be defined by the claims of the application.

Claims

1. A domestic water purification system characterized in that, It comprises: a water inlet valve (41), a pipe-in-pipe pipeline, a first purifier (44) and / or a second purifier (55), and a plurality of water facilities, The pipe-in-pipe pipeline comprises a pipe-in-pipe inner pipeline (46), a pipe-in-pipe outer pipeline (45), and a support frame (49) arranged between the inner and outer pipelines, The pipe-in-pipe inner pipeline (46) comprises an inner pipe and an inner pipe fitting, and the pipe-in-pipe outer pipeline (45) comprises an outer pipe and an outer pipe fitting, The support frame (49) adopts a hollow structure and is arranged between the pipe-in-pipe inner pipeline (46) and the pipe-in-pipe outer pipeline (45) of the pipe-in-pipe pipeline, When part of the water facilities are in operation: Domestic water enters the water inlet pipeline (42) through the water inlet valve (41), then enters the inner flow channel (48) of the pipe-in-pipe inner pipeline (46), and then flows into the water facilities in operation after pressure relief, The water inlet pipeline (42) is provided with a water inlet bypass pipeline (43): domestic water entering the water inlet pipeline (42) through the water inlet valve (41) enters the outer flow channel (47) of the pipe-in-pipe pipeline through the water inlet bypass pipeline (43) and the first purifier (44), and then flows into the water facilities in operation after pressure relief, the first purifier (44) functions as a throttling pressure reducer, a pressure difference is formed between the outer flow channel (47) and the inner flow channel (48) of the pipe-in-pipe pipeline, and the water facilities not in operation flow from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel (47) and the inner flow channel (48) of the pipe-in-pipe pipeline, thereby forming a circulating flow of live water in the entire pipe-in-pipe pipeline; Or domestic water enters the water inlet pipeline (42) through the water inlet valve (41), the second purifier (55), and then enters the inner flow channel (48) of the pipe-in-pipe inner pipeline (46), and then flows into the water facilities in operation after pressure relief, The water inlet pipeline (42) is provided with a water inlet bypass pipeline (43): domestic water entering the water inlet pipeline (42) through the water inlet valve (41) enters the outer flow channel (47) of the pipe-in-pipe pipeline through the water inlet bypass pipeline (43), and then flows into the water facilities in operation after pressure relief, the second purifier (55) functions as a throttling pressure reducer, a pressure difference is formed between the outer flow channel (47) and the inner flow channel (48) of the pipe-in-pipe pipeline, and the water facilities not in operation flow from the high-pressure flow channel to the low-pressure flow channel due to the pressure difference between the outer flow channel (47) and the inner flow channel (48) of the pipe-in-pipe pipeline, thereby forming a circulating flow of live water in the entire pipe-in-pipe pipeline; Or domestic water enters the water inlet pipeline (42) through the water inlet valve (41), the second purifier (55), and then enters the inner flow channel (48) of the pipe-in-pipe inner pipeline (46), and then flows into the water facilities in operation after pressure relief, The water inlet pipeline (42) is provided with a water inlet bypass pipeline (43). Household water entering the water inlet pipeline (42) through the water inlet valve (41) enters the outer flow channel (47) of the pipe-in-pipe pipeline through the water inlet bypass pipeline (43) and the first purifier (44), and flows into the water using facility. The first purifier (44) functions as a throttling and pressure reducing device, and a pressure difference is formed between the outer flow channel (47) and the inner flow channel (48) of the pipe-in-pipe pipeline. The water using facility not in use causes the household water to flow from the high pressure flow channel to the low pressure flow channel due to the pressure difference between the outer flow channel (47) and the inner flow channel (48) of the pipe-in-pipe pipeline, thereby forming a circulating flow of the entire pipe-in-pipe pipeline.

2. The household water purification system according to claim 1, wherein The connection between the pipes, between the pipe and the pipe fitting, and between the pipe fittings in the pipe-in-pipe pipeline is achieved by welding, hot melt connection, expansion joint or threaded connection.

3. The household water purification system according to claim 1, wherein The first purifier (44) and / or the second purifier (55) comprises a filter, an ultraviolet sterilizer, an ozone sterilizer, a reverse osmosis membrane purifier or a water softener.

4. The household water purification system according to claim 1, wherein The water using facility comprises a faucet, a hot and cold water faucet, a shower, a washing machine, a dishwasher, and a hot water heater for heating.

5. The household water purification system according to claim 1, wherein The support frame (49) of the pipe-in-pipe pipeline is provided with a plurality of throttling holes, which function as throttling and support for the inner and outer pipelines of the pipe-in-pipe pipeline.

6. The household water purification system according to claim 1, wherein The household water comprises tap water, hot water or underground water.

7. The household water purification system according to claim 1, wherein The support frame (49) and the inner pipeline (46) or the outer pipeline (45) of the pipe-in-pipe pipeline adopt a split or integrated structure.

8. The household water purification system according to claim 1, wherein When the first purifier (44) and the second purifier (55) are used simultaneously, a pressure difference exists between the fluid in the inner flow channel (48) and the outer flow channel (47) of the pipe-in-pipe pipeline at the water using facility.

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