Drinking water main machine and water supply system

Abstract

The utility model relates to the technical field of industrial water supply, in particular to a drinking water main machine and a water supply system. A water inlet pipe of a machine body is sequentially connected with a front filtering mechanism, a booster pump, a filtering membrane group, a rear filtering mechanism and a water tank through pipelines; the water tank is connected with the pressure barrel through a water supply pipeline, and the pressure barrel is connected with the water tank through a backflow pipeline. The water supply pipeline is provided with a circulating pump and a water outlet pipe; the filtering membrane group comprises at least one membrane element; the machine body is provided with a plurality of sockets, parts of the sockets are used for installing membrane elements, and the rest parts are used for installing sealing parts. According to the utility model, the number of the membrane elements can be flexibly selected according to water purification requirements, and the appearance of the water purification host can be kept consistent and attractive by installing the sealing pieces for the sockets without the membrane elements. In addition, the internal layout of the machine body is compact, water and electricity are separated, and the machine is safer.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial water supply, in particular to a drinking water host and a water supply system. Background Art

[0002] The structure of water purification system generally includes coarse filtration, activated carbon adsorption, ion exchange resin, hollow fiber and reverse osmosis membrane. Tap water contains many harmful substances, such as soluble heavy metal ions, excessive residual chlorine, rust, bacteria and viruses, etc. Water purifier can effectively remove chlorine, heavy metals, bacteria, viruses, algae, suspended solids and various organic matter in water, making the treated water clear, clean and sterile, and can improve the taste.

[0003] For example, a Chinese patent with publication number CN217437929U discloses a water supply main unit of a dry fog dust suppression system, including a shell, in which a medicine box, a filter, a water tank, a booster pump and a backwashing device are installed; the water inlet of the backwashing device is connected to an external water source through an inlet pipe, and its water outlet is connected to the water inlet of the filter through a No. 1 connecting pipe, the water outlet of the filter is connected to the water inlet of the water tank through a No. 2 connecting pipe, the water outlet of the water tank is connected to the water inlet of the booster pump through a No. 3 connecting pipe, and the water outlet of the booster pump is connected to an external spray device through the outlet pipe; the medicine box is used to add medicine to the backwashing device.

[0004] For example, a Chinese patent with publication number CN112811539B discloses an integrated double-circulation plasma activated water machine, comprising: a plasma activated water machine housing, in which a plasma reactor, a water purifier, a clean water storage tank, a gas-liquid mixing pump, a plasma mixing tank, a frequency converter, a high-voltage transformer, and a control unit are arranged, the gas outlet of the plasma reactor is connected to the inlet II of the gas-liquid mixing pump through a pipeline, and the outlet of the gas-liquid mixing pump is connected to the water inlet II of the plasma mixing tank through a pipeline; the water outlet I of the plasma mixing tank is connected to the clean water storage tank through a pipeline, and the water outlet II of the plasma mixing tank is connected to the inlet I of the gas-liquid mixing pump through a pipeline.

[0005] The number of membrane elements in the water purifier in the prior art is fixed, that is, the flow rate of the whole machine is fixed, and the number of membrane elements cannot be adjusted according to the water purification demand, that is, the flow rate of the whole machine cannot be adjusted. In addition, the internal parts of such water purifiers occupy a large space, and the separation of water and electricity is not achieved.

[0006] In addition, the water supply systems in the prior art mostly use a series connection to supply water, or use a single-pipeline circulating water supply. When supplying water to a large area, the single-pipeline circulating water supply has a too long pipeline, a large pipe resistance, a high pipeline pressure, and requires a high-power pump, which consumes a lot of energy. Utility Model Content

[0007] In order to solve the above problems, the purpose of the utility model is to provide a drinking water host and a water supply system.

[0008] The technical solution provided by the utility model is:

[0009] In a first aspect, a drinking water main unit comprises a main body; the main body is provided with a water inlet pipe, and the water inlet pipe is sequentially connected to a pre-filter mechanism, a booster pump, a filter membrane group, a post-filter mechanism, and a water tank through pipelines;

[0010] The water tank is connected to the pressure barrel through a water supply pipeline, and the pressure barrel is connected to the water tank through a return pipeline; the water supply pipeline is installed with a circulation pump, a pressure detection mechanism and a water outlet pipe;

[0011] The filtration membrane group includes at least one membrane element;

[0012] The machine body is provided with a plurality of sockets, the socket part is used for installing the membrane element, and the rest part is used for installing the closing piece.

[0013] As an optional technical solution, the closure housing is the same as the membrane element housing, and the water outlet and water inlet of the closure are closed.

[0014] As an optional technical solution, the filter membrane group is located on one side of the machine body, the circulation pump and the booster pump are located below the filter membrane group; the pressure barrel is located on the other side of the machine body; the water tank is roughly located in the middle of the machine body; the pre-filter mechanism and the post-filter mechanism are arranged side by side between the filter membrane group and the water tank.

[0015] As an optional technical solution, pressure barrel installation locations are provided between the two corners on the other side of the machine body and the water tank; there are two pressure barrels, which are respectively placed at the pressure barrel installation locations.

[0016] As an optional technical solution, the filter membrane group is arranged on one side of the machine body, and the pressure barrel is located below the filter membrane group;

[0017] The water tank is located roughly in the middle of the machine body;

[0018] The pre-filter mechanism and the post-filter mechanism are respectively located on both sides of the machine body and are arranged diagonally;

[0019] The circulation pump and the booster pump are respectively located on both sides of the machine body and arranged diagonally, wherein the circulation pump is arranged on the other side of the machine body.

[0020] As an optional technical solution, a display screen is installed on the body, and the display screen is electrically connected to a control mechanism arranged in the body;

[0021] The control mechanism is also electrically connected to the circulation pump and the booster pump, and the button signal of the display screen is fed back to the control mechanism to control the circulation pump and the booster pump to be turned on or off;

[0022] The display screen and the control mechanism are located above the pre-filtering mechanism, the booster pump, the filter membrane group, the post-filtering mechanism, the water tank, the pressure tank, the circulation pump and the pipelines.

[0023] As an optional technical solution, an ultraviolet lamp is installed in the water tank, and the inner wall of the water tank is a mirror surface, which is used to reflect ultraviolet rays.

[0024] As an optional technical solution, the machine body is provided with a front door and a side door, and the side door is used for maintenance and / or displaying the interior of the machine body. When the front door is opened, the membrane element can be replaced and the display screen can be operated.

[0025] As an optional technical solution, the pre-filter mechanism is provided with an activated carbon fiber composite filter element; the post-filter mechanism is provided with a granular activated carbon filter element or a carbon rod; and the membrane element is a reverse osmosis membrane element or a nanofiltration membrane element.

[0026] As an optional technical solution, an air inlet is provided at the bottom back of the body, a heat dissipation fan is installed inside the body, and an air outlet is provided at the top of the body; a fan for blowing hot air out of the body is provided at the air outlet and / or a fan for drawing cold air into the body is installed at the air inlet.

[0027] As an optional technical solution, universal wheels and / or machine feet are installed at the four corners of the bottom of the machine body.

[0028] In a second aspect, a water supply system includes the drinking water main unit in the first aspect or any one of the technical solutions in the first aspect; and further includes a water supply main and a water return main, wherein the water supply main is connected to the water outlet pipe of the drinking water main unit, and the water return main is connected to the water return pipe of the drinking water main unit;

[0029] The water supply main is connected in parallel with a plurality of water supply branches, and the water return main is connected in parallel with a plurality of water return branches;

[0030] The water supply branch pipe is connected in parallel with a plurality of secondary pipelines, and the secondary pipelines are also connected with the return branch pipe.

[0031] As an optional technical solution of the second aspect, the diameters of the water supply main pipe, the water supply branch pipe, and the secondary pipeline are reduced successively.

[0032] As an optional technical solution of the second aspect, it also includes a pressure-stabilizing water supply mechanism, which is used to reduce water hammer and supply water to the water supply branch pipe.

[0033] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0034] The body of the utility model is provided with a plurality of membrane element sockets, and the number of membrane elements can be flexibly selected according to the water purification demand, thereby adjusting the flow of the whole machine. For the sockets without membrane elements installed, by installing a closure member that is the same as the membrane element but has a closed water outlet and a closed water inlet, the appearance of the water purifier can be kept consistent and beautiful. In addition, the internal structure of the body of the utility model is compact and the water and electricity are separated, which is safer.

[0035] In addition, the water supply system of the utility model adopts a parallel mode, which can reduce pipe loss. In addition, due to the use of layered water supply, the pipe diameter of each layer can be appropriately reduced, effectively reducing the cost of pipe laying. Moreover, each floor is equipped with a floor pressure barrel, which can improve the water supply capacity of each floor. In addition, for the difference in water usage between floors, the floor pressure barrels can also be adjusted to each other, reducing the start-up time and frequency of the circulation pump, thereby saving energy and reducing noise. At the same time, in addition to overcoming pipe loss, the high-rise water supply circulation pump must also overcome the influence of the floor height. The outlet pressure of the circulation pump is often large, and a large water hammer may be generated during startup, affecting the life of the pipeline and the terminal. The presence of floor pressure barrels on each floor can effectively reduce water hammer.

[0036] In addition, the utility model supplies water through a pressure barrel, reduces the opening of the circulation pump when a small amount of water is used, and plays an energy-saving role, and the pressure guarantee is achieved through the linkage of the circulation pump and the pressure sensor. When the water pressure in the pressure barrel is reduced, water can be pumped from the water tank. The water pumped from the water tank can ensure the stability of the outlet water pressure on the one hand, and on the other hand, it can also enter the pressure barrel to increase the pressure of the pressure barrel. Since the utility model is provided with a pressure barrel and a water tank, it avoids the continuous opening of the booster pump and the circulation pump, avoids the increase in the outlet water temperature caused by the temperature rise of the pump body, and can also ensure that the outlet water pressure still meets the demand for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a front view of a drinking water host in one embodiment of the present application;

[0038] Figure 2 This is a side view of a drinking water host in one embodiment of the present application;

[0039] Figure 3 This is a rear view of a drinking water host in one embodiment of the present application;

[0040] Figure 4 A top view of a drinking water host in one embodiment of the present application;

[0041] Figure 5 This is a schematic diagram of the internal structure of a drinking water host in one embodiment of the present application;

[0042] Figure 6 This is a schematic diagram of the internal structure of a drinking water host in another embodiment of the present application;

[0043] Figure 7 It is a schematic diagram of the internal structure of a water supply main unit in the prior art;

[0044] Figure 8 It is a schematic diagram of the internal structure of another water supply main unit in the prior art;

[0045] Fig. 9 This is a schematic diagram of a water supply system in one embodiment of the present application.

[0046] Explanation of the symbols in the schematic diagram:

[0047] Airframe 101;

[0048] Universal wheel 102;

[0049] Display screen 103;

[0050] Side door 104;

[0051] Air inlet 105;

[0052] Air outlet 106;

[0053] Main control board 107;

[0054] Power supply 108;

[0055] Membrane element 201;

[0056] Filter membrane group 202;

[0057] Circulation pump 203;

[0058] Circulation pump 204;

[0059] Post-filter mechanism 205;

[0060] Pre-filter mechanism 206;

[0061] Water tank 207;

[0062] Pressure tank 208;

[0063] Water supply main 301;

[0064] Return pipe 302;

[0065] Water supply branch pipe 303;

[0066] Water return branch pipe 304;

[0067] Pressure stabilizing water supply mechanism 305;

[0068] Secondary pipeline 306. DETAILED DESCRIPTION

[0069] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0070] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0071] In one embodiment, if Figure 1 As shown, the utility model provides a drinking water main unit, including a body 101, wherein the body 101 is provided with a water inlet pipe and a water outlet pipe, water to be purified flows into the water inlet pipe, and water purified by the main unit flows out from the water outlet pipe for use by users.

[0072] A pre-filter mechanism 206 , a booster pump 204 , a filter membrane group 202 , a post-filter mechanism 205 , a water tank 207 , a pressure tank 208 , and a circulation pump 203 are arranged in the machine body 101 .

[0073] Specifically, the water inlet pipe is connected to the pre-filter mechanism 206, the booster pump 204, the filter membrane group 202, the post-filter mechanism 205, and the water tank 207 in sequence through the pipeline. The water tank 207 is connected to the pressure barrel 208 through the water supply pipeline, and the pressure barrel 208 is connected to the water tank 207 through the return pipeline. The water supply pipeline is equipped with a circulation pump 203, a pressure detection mechanism, and a water outlet pipe. The return pipeline can be equipped with a return valve. The pressure detection mechanism can detect the water pressure, and a pressure sensor can be selected.

[0074] The water to be purified enters the pre-filter mechanism 206 from the water inlet pipe, and the pre-filter mechanism 206 filters the water to remove larger impurities. Then, after being pressurized by the booster pump 204, the water enters the filter membrane group 202. The waste water generated by the filter membrane group 202 is discharged from the waste water pipe. The generated pure water is filtered by the post-filter mechanism 205 to improve the taste, and then enters the water tank 207 for storage.

[0075] The circulating pump 203 pumps water from the water tank 207 until the water pressure in the pressure barrel 208 reaches the set value and then is closed. When taking water, water is first supplied through the pressure barrel 208. When the water pressure in the pressure barrel 208 drops to a low water pressure state, the circulating pump 203 is turned on, and part of the water pumped from the water tank 207 by the circulating pump 203 enters the water outlet pipe, thereby ensuring the water pressure and temperature of the outlet water, and the other part enters the pressure barrel 208 to increase the pressure of the pressure barrel 208. If the pressure barrel 208 is pressurized to a higher water pressure and the amount of water taken is small, the water can be allowed to flow back to the water tank 207, thereby maintaining a stable water pressure of the outlet water.

[0076] In one embodiment, the filter membrane group 202 includes at least one membrane element 201, that is, the filter membrane group 202 may be a plurality of membrane elements 201 arranged in parallel, and one or more membrane elements 201 may be installed according to the water purification requirements. The body 101 is provided with a plurality of sockets, the socket part is used to install the membrane element 201, and the rest is used to install the closure.

[0077] Specifically, the enclosure housing is the same as the membrane element 201 housing, and the water outlet and water inlet of the enclosure are closed. For the socket without the membrane element installed, by installing an enclosure having the same housing as the membrane element but with the water outlet and water inlet closed, the appearance of the water purifier can be kept consistent and beautiful.

[0078] In one embodiment, a one-way valve may be installed on each pipeline to ensure the direction of water flow.

[0079] In one embodiment, the membrane element 201 may be a reverse osmosis membrane element or a nanofiltration membrane element, preferably an integrated filter element, which is easy to replace and provides a better user experience.

[0080] In one embodiment, if Figure 5 As shown, the filter membrane group 202 is located on one side of the machine body 101, and the circulation pump 203 and the booster pump 204 are located below the filter membrane group 202. The pressure tank 208 is located on the other side of the machine body 101, and the water tank 207 is approximately located in the middle of the machine body 101. The pre-filter mechanism 206 and the post-filter mechanism 205 are arranged in parallel between the filter membrane group 202 and the water tank 207.

[0081] In one embodiment, pressure barrel installation places are provided between the two corners on the other side of the body 101 and the water tank 207, and there are two pressure barrels 208, which are respectively placed at the pressure barrel installation places. Compared with only one pressure barrel and the water tank 207 arranged side by side, placing two pressure barrels 208 at the corners can make the body 101 smaller, the internal parts of the body 101 more compact, and the overall volume of the body 101 smaller when the total volume of the pressure barrels remains unchanged.

[0082] Since the water tank 207 is heavy after storing water, the water tank 207 is placed in the middle of the body 101 to make the center of gravity as central as possible, which can improve the stability of the body 101. In addition, placing the booster pump 204 as close to the filter membrane group 202 as possible can save pipelines and reduce pressure loss.

[0083] In one embodiment, if Figure 6 As shown, the filter membrane group 202 is arranged on one side of the body 101, such as the front side, and the pressure tank 208 is located below the filter membrane group 202. The water tank 207 is roughly located in the middle of the body 101. The pre-filter mechanism 206 and the post-filter mechanism 205 are respectively located on both sides of the body 101 and are arranged diagonally. The circulation pump 203 and the booster pump 204 are respectively located on both sides of the body 101 and are arranged diagonally, wherein the circulation pump 203 is arranged on the other side of the body 101, such as the rear side. In this embodiment, the arrangement of each pipeline is basically not crossed, the pipeline arrangement is clearer, and the structure is more compact.

[0084] In one embodiment, a display screen 103 is installed on the body 101, and the display screen 103 is electrically connected to a control mechanism disposed in the body 101. The control mechanism is also electrically connected to the circulation pump 203 and the booster pump 204, and is used to control the circulation pump 203 and the booster pump 204 to be turned on or off. The key signal on the display screen 103 is fed back to the controller, so that the opening and closing of the pump and the valve are controlled by the control mechanism.

[0085] In this embodiment, the display screen 103 and the control mechanism are located above the pre-filter mechanism 206, the booster pump 204, the filter membrane group 202, the post-filter mechanism 205, the water tank 207, the pressure tank 208, the circulation pump 203 and each pipeline, so as to separate water and electricity and ensure safety. At this time, even if water leakage occurs in time, it will not affect the safety of the circuit.

[0086] In this embodiment, the control mechanism includes a main control board 107 and a power supply 108. In another embodiment, the control mechanism may be a PLC electric control box (not shown in the figure).

[0087] In one embodiment, an ultraviolet lamp is installed in the water tank 207, and the inner wall of the water tank 207 is a mirror surface, which is used to reflect ultraviolet rays, thereby enhancing the irradiation effect of the ultraviolet lamp. Specifically, the inner wall of the water tank 207 can be 304 or 316 stainless steel, and the inner wall is polished.

[0088] In one embodiment, if Figure 2 As shown, the body 101 is provided with a side door 104, which is used for maintenance and / or displaying the interior of the body. For example, the side door 104 can be a glass door, so as to facilitate displaying the internal structure. The side door 104 can also be equipped with a door lock to ensure the safety of internal equipment and drinking water.

[0089] In this embodiment, the front face of the body 101 (i.e., the side with the display screen 103 and the socket) can also be equipped with a front door, such as a glass door, and a door lock. When the membrane element 201 needs to be replaced and the display screen 103 needs to be operated, the glass door is opened for replacement.

[0090] In one embodiment, the pre-filter mechanism 206 is provided with an activated carbon fiber composite filter element, and the post-filter mechanism 205 is provided with a granular activated carbon filter element or a carbon rod.

[0091] The pre-filter mechanism 206 and the post-filter mechanism 205 can use cluster filters to increase the water flow rate. In addition, the pre-filter mechanism 206 and the post-filter mechanism 205 are preferably 20-inch filter elements. Because the life of a 10-inch filter element is short, and the number needs to be increased, which will increase the diameter of the filter, and a 30 or 40-inch filter element is too long, and it is not convenient to pull it out from the tank body when replacing the filter element.

[0092] It should be noted that the pre-filter mechanism 206 and the post-filter mechanism 205 are not limited to the above-mentioned types of filter elements.

[0093] In one embodiment, if Figure 3-4 As shown, an air inlet 105 is provided at the bottom of the back of the machine body 101, and an air outlet 106 is provided at the top of the machine body 101. A fan for blowing hot air out of the machine body 101 may be provided at the air outlet 106, and a fan for drawing cold air into the machine body 101 may also be installed at the air inlet 105. Thus, ventilation and heat dissipation are achieved inside the machine body 101. Dust filtering mechanisms may be installed at the air inlet 105 and the air outlet 106 to filter dust in the air and prevent dust from entering the machine body 101.

[0094] In one embodiment, universal wheels 102 or machine feet or a combination of the two are installed at the four corners of the bottom of the body 101. When pure water is stored in the water tank 207 and the pressure barrel 208, the water purifier is heavy, and universal wheels 102 are installed at the four corners of the bottom of the body 101 to facilitate the movement of the host.

[0095] The utility model also provides a water supply system, such as Fig. 9 As shown, it includes the above-mentioned drinking water main unit; it also includes a water supply pipe 301 and a return water pipe 302, wherein the water supply pipe 301 is connected to the outlet pipe of the drinking water main unit, and the return water pipe 302 is connected to the return water pipe of the drinking water main unit.

[0096] The water supply main pipe 301 is connected in parallel with a plurality of water supply branch pipes 303 , and the water return main pipe 302 is connected in parallel with a plurality of water return branch pipes 304 .

[0097] When water supply is required for a larger plane, the plane can be divided into multiple small areas, each of which is equipped with a water supply branch pipe 303 and a water return branch pipe 304. When water is supplied to higher floors, each floor is equipped with at least one water supply branch pipe 303 and one water return branch pipe 304. Each floor is individually circulated with water, and the parallel water supply method can reduce pipe loss. At the same time, due to the stratified water supply, the flow is diverted, and the pipe diameter of each floor can be appropriately reduced, effectively reducing the pipe laying cost.

[0098] The water supply branch pipe 303 is connected in parallel with multiple secondary pipes 306, which are also connected to the return branch pipe 304. There may be several smaller areas in each area or each floor. On the basis of stratified water supply, for the water supply of larger floors, going around each water supply terminal will cause the length of each branch pipe to be longer. Especially when facing the scenario of large floor area and scattered water supply terminals, the length of each branch pipe will increase significantly. Although the branch pipe is thinner than the main pipe, the cost is still high.

[0099] In the present invention, the main pipe supplies water to each floor or area, and each floor or area uses a separate water supply branch pipe and return branch pipe, and then a thinner PE hose or other low-cost pressure-resistant secondary pipe 306 is led out from the water supply branch pipe and return branch pipe of each floor or area to each water supply terminal, forming a multi-stage circulation mode, further reducing the cost and difficulty of pipe laying. That is, in this embodiment, the diameters of the water supply main pipe 301, the water supply branch pipe 303, and the secondary pipe 306 are reduced in sequence.

[0100] In order to relieve the water supply pressure of each floor of the high-rise water supply, or to relieve the water supply pressure of the area far away from the main unit, effectively reduce the volume of the main unit pressure barrel and thus reduce the size of the main unit, a pressure-stabilizing water supply mechanism 305 for pressure-stabilizing water supply can be added to each floor or each area, and the pressure-stabilizing water supply mechanism 305 is used to supply water to the water supply branch pipe 303. On the one hand, the access of the pressure-stabilizing water supply mechanism 305 does not require electrical control, which is more convenient; on the other hand, each pressure-stabilizing water supply mechanism 305 can enhance the water supply capacity of each water supply branch pipe 303. For the difference in water use between floors or between various areas, the pressure-stabilizing water supply mechanism 305 can also adjust each other to reduce the start-up time and frequency of the circulation pump, thereby saving energy and reducing noise. At the same time, in addition to overcoming pipe loss, the high-rise water supply circulation pump must also overcome the influence of the floor height. The outlet pressure of the circulation pump is often large, and a large water hammer may be generated when starting, affecting the life of the pipeline and the terminal. The existence of each pressure-stabilizing water supply mechanism 305 can effectively reduce water hammer.

[0101] The pressure-stabilizing water supply mechanism 305 can be a pressure barrel or a water tank, and the water tank is installed with a pump and a pressure sensor, and the water stored in the water tank is transported to the water supply branch pipe 303 through the pump.

[0102] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A drinking water main unit, comprising a body (101); Features: The machine body (101) is provided with a water inlet pipe, which is sequentially connected to a pre-filter mechanism (206), a booster pump (204), a filter membrane group (202), a post-filter mechanism (205), and a water tank (207) through pipelines; The water tank (207) is connected to the pressure tank (208) via a water supply pipeline, and the pressure tank (208) is connected to the water tank (207) via a return pipeline; the water supply pipeline is equipped with a circulation pump (203), a pressure detection mechanism, and a water outlet pipe; The filtration membrane group (202) comprises at least one membrane element (201); The machine body (101) is provided with a plurality of sockets, wherein the socket part is used for installing the membrane element (201), and the remaining part is used for installing the closure member.

2. The drinking water main unit according to claim 1, characterized in that: The shell of the closure is the same as the shell of the membrane element (201), and the water outlet and water inlet of the closure are closed.

3. The drinking water main unit according to claim 1, characterized in that: The filter membrane group (202) is located on one side of the machine body (101), and the circulation pump (203) and the booster pump (204) are located below the filter membrane group (202); The pressure tank (208) is located on the other side of the machine body (101); The water tank (207) is approximately located in the middle of the machine body (101); The pre-filtering mechanism (206) and the post-filtering mechanism (205) are arranged in parallel between the filter membrane group (202) and the water tank (207).

4. The drinking water main unit according to claim 3, characterized in that: Pressure barrel installation locations are provided between the two corners on the other side of the machine body (101) and the water tank (207); There are two pressure barrels (208), and the two pressure barrels (208) are respectively placed at the pressure barrel installation locations.

5. The drinking water main unit according to claim 1, characterized in that: The filter membrane group (202) is arranged on one side of the machine body (101), and the pressure tank (208) is located below the filter membrane group (202); The water tank (207) is approximately located in the middle of the machine body (101); The pre-filter mechanism (206) and the post-filter mechanism (205) are respectively located on both sides of the machine body (101) and are arranged diagonally; The circulation pump (203) and the booster pump (204) are respectively located on two sides of the machine body (101) and are arranged diagonally, wherein the circulation pump (203) is arranged on the other side of the machine body (101).

6. The drinking water main unit according to claim 1, characterized in that: A display screen (103) is installed on the machine body (101), and the display screen (103) is electrically connected to a control mechanism disposed in the machine body (101); The control mechanism is also electrically connected to the circulation pump (203) and the booster pump (204), and the key signal of the display screen (103) is fed back to the control mechanism to control the circulation pump (203) and the booster pump (204) to be turned on or off; The display screen (103) and the control mechanism are located above the pre-filtering mechanism (206), the booster pump (204), the filter membrane group (202), the post-filtering mechanism (205), the water tank (207), the pressure tank (208), the circulation pump (203) and the pipelines.

7. The drinking water host according to any one of claims 1 to 6, characterized in that: An ultraviolet lamp is installed in the water tank (207), and the inner wall of the water tank (207) is a mirror surface, which is used to reflect ultraviolet rays.

8. The drinking water main unit according to claim 6, characterized in that: The machine body (101) is provided with a front door and a side door (104); The side door (104) is used for inspection and / or display of the interior of the machine body; When the front door is opened, the membrane element (201) can be replaced and the display screen (103) can be operated.

9. The drinking water host according to any one of claims 1 to 6, characterized in that: The pre-filter mechanism (206) is provided with an activated carbon fiber composite filter element; The post-filter mechanism (205) is provided with a granular activated carbon filter element or a carbon rod; The membrane element (201) is a reverse osmosis membrane element or a nanofiltration membrane element.

10. The drinking water host according to any one of claims 1 to 6, characterized in that: The bottom of the back of the machine body (101) is provided with an air inlet (105), and the top of the machine body (101) is provided with an air outlet (106); The air outlet (106) is provided with a fan for blowing hot air out of the machine body (101), and / or the air inlet (105) is provided with a fan for drawing cold air into the machine body (101).

11. The drinking water host according to any one of claims 1 to 6, characterized in that: Universal wheels (102) and / or machine feet are installed at the four corners of the bottom of the machine body (101).

12. A water supply system, characterized in that: The invention comprises a drinking water main unit as claimed in any one of claims 1 to 11; and further comprises a water supply pipe (301) and a water return pipe (302), wherein the water supply pipe (301) is connected to a water outlet pipe of the drinking water main unit, and the water return pipe (302) is connected to a water return pipe of the drinking water main unit; The water supply main pipe (301) is connected in parallel to a plurality of water supply branch pipes (303), and the water return main pipe (302) is connected in parallel to a plurality of water return branch pipes (304).

13. The water supply system according to claim 12, characterized in that: The water supply branch pipe (303) is connected in parallel with a plurality of secondary pipelines (306), and the secondary pipelines (306) are also connected to the water return branch pipe (304).

14. The water supply system according to claim 13, characterized in that: The diameters of the water supply main pipe (301), the water supply branch pipe (303), and the secondary pipeline (306) decrease in sequence.

15. The water supply system according to claim 12, characterized in that: It also includes a pressure-stabilizing water supply mechanism (305), which is used to reduce water hammer and supply water to the water supply branch pipe (303).

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