Direct drinking water system, direct drinking water machine and control method

Abstract

The present invention belongs to the field of water treatment technology, and relates to a direct drinking water system, a direct drinking water machine and a control method. The direct drinking water system includes a pre-filter assembly, a post-filter assembly, a hot tank unit, a water tank unit and a control unit. The water tank unit includes a water tank body and a steam tank. The water tank body is arranged between the pre-filter assembly and the post-filter assembly. The steam inlet pipe of the steam tank is connected to the steam outlet of the hot tank unit, and the steam discharged by the hot tank unit can be introduced into the inner cavity of the steam tank to heat the water in the water tank body. The exhaust end of the steam tank is provided with an exhaust pipe connected to the outside. A temperature sensor part is provided in the water tank body, and the control unit can control whether the steam generated by the hot tank unit flows into the steam tank according to the water temperature in the water tank body fed back by the temperature sensor part. The present invention can effectively utilize the steam generated by the direct drinking water purifier when heating purified water, and can recycle heat energy and improve the water production rate of purified water.

Description

Technical Field

[0001] The present invention relates to the field of water purification devices of water treatment technology, and in particular to a direct drinking water system, a direct drinking water machine and a control method. Background Art

[0002] In the water purification devices disclosed in many previous patent documents, such as the publication number CN105731698B, the patent name is a new type of direct drinking water purifier; the publication number CN115159711A, the patent name is a water purification system of a water purification equipment and a water purification method of a water purification equipment; the publication number CN117263411A, the patent name is a water purification method of a water purifier and a water purifier; the publication number CN112408611A, the patent name is a water purification device, a water purification system and a water purification method, generally include a pre-filter assembly, a water pump, a plurality of solenoid valves and / or control valves, a reverse osmosis membrane filter unit and / or a post-treatment unit, etc. The raw water / tap water entering the water purifier is treated by the pre-filter assembly, and then enters the reverse osmosis membrane filter unit in the post-filter assembly for reverse osmosis treatment. If a post-treatment unit is also provided, the clean water formed after the reverse osmosis treatment will also enter the post-treatment unit for further treatment before being discharged to produce direct drinking water / cleaned water.

[0003] The water treated by the reverse osmosis membrane filtration unit is divided into clean water and concentrated water. If the clean water produced after reverse osmosis treatment can meet the direct drinking standard according to the water quality standards stipulated by the Ministry of Health, it is direct drinking water; the concentrated water produced at the same time is often discharged directly. At room temperature (that is, when the water temperature is around 25 degrees Celsius), the production ratio between clean water and waste water produced by the existing reverse osmosis water purifier is mostly around 1:3, that is, one liter of clean water is produced, and three liters of waste water will be produced at the same time. The effective utilization rate of water sources is only one-fourth, which is a great waste. In winter, if the raw water temperature is lower than 25 degrees Celsius, the production ratio of clean water to waste water and the effective utilization rate of water sources will be lower. When the raw water temperature is lower than 22 degrees Celsius, the production ratio of clean water to waste water may even be below 1:4. In addition, in order to ensure that the direct drinking water has a suitable drinking temperature, the direct drinking water purifier is mostly equipped with a heating device. However, the steam generated by the existing direct drinking water purifier during the heating process is directly discharged into the air, without recycling, which is a certain waste. Summary of the invention

[0004] In order to overcome the adverse effect of raw water temperature on the water purification ratio of a direct drinking water purifier, the present invention provides a direct drinking water system, a direct drinking water purifier and a control method, which can effectively utilize the steam generated by the direct drinking water purifier when heating the purified water, thereby achieving the purpose of recycling heat energy and improving the water purification rate.

[0005] The present invention adopts the following technical scheme to achieve its technical purpose.

[0006] A direct drinking water system comprises a pre-filter assembly, a post-filter assembly, a hot tank unit, a water tank unit and a control unit, wherein the post-filter assembly comprises a reverse osmosis membrane filter unit.

[0007] The hot tank unit can heat the direct drinking water before supplying it, and includes a water inlet pipe, a drain pipe, a temperature sensor unit and a steam outlet. Moreover, the water inlet pipe of the hot tank unit is connected to the drain end of the post-filter assembly, and the drain pipe of the hot tank unit is connected to the faucet of the terminal. The temperature sensor unit of the hot tank unit is connected to the control unit, so that the control unit can control the water temperature of the hot tank unit.

[0008] The water tank unit comprises a water tank body and a steam tank arranged inside the water tank body.

[0009] The water inlet of the water tank body is connected to the water outlet of the pre-filter assembly, and the water outlet of the water tank body is connected to the water inlet of the post-filter assembly. Therefore, the water tank body can store water treated by the pre-filter assembly and continuously supply it to the post-filter assembly under the control of the control unit.

[0010] The steam inlet end of the steam tank is connected to the steam outlet of the hot tank unit, so that the hot steam generated when the hot tank unit is heated can be introduced into the inner cavity of the steam tank to heat the water in the water tank body.

[0011] The exhaust end of the steam tank is provided with an exhaust pipe connected to the outside.

[0012] A temperature sensor part is provided in the cavity of the water tank body. The control unit can control whether the hot steam generated during the heating process of the hot tank unit flows into the steam tank according to the water temperature in the water tank body fed back by the temperature sensor part.

[0013] Optionally, a pressure sensing unit is provided in the cavity of the steam tank. The control unit can control whether the hot steam generated during the heating process of the hot tank unit flows into the steam tank, and control the on / off state of the pressure relief solenoid valve 1 provided on the exhaust pipe according to the pressure feedback from the pressure sensing unit and / or the water temperature feedback from the temperature sensor provided in the water tank body.

[0014] Optionally, a pressure relief pipe is provided on the steam inlet pipe connecting the steam tank and the hot tank unit, and a second pressure relief solenoid valve is provided on the pressure relief pipe. The control unit can also control the on-off state of the second pressure relief solenoid valve according to the pressure feedback from the pressure sensor provided in the steam tank and / or the water temperature feedback from the temperature sensor provided in the water tank body.

[0015] Optionally, the water tank body comprises an inner water tank and an outer water tank. At least one valve cover is provided on the wall of the inner water tank and the control unit can control the opening and closing state of the valve cover to selectively switch the cavity of the inner water tank and the cavity of the outer water tank between a connected state and a blocked state.

[0016] The steam tank is arranged in the cavity of the inner water tank, and can directly heat the water in the inner water tank by means of the steam entering the tank cavity. The water inlet end of the inner water tank is connected to the water outlet end of the pre-filter assembly. The temperature sensor part arranged in the water tank body includes a first temperature sensor arranged in the inner water tank and a second temperature sensor arranged in the outer water tank.

[0017] A first drain pipe is provided at the water outlet of the inner water tank, and a second drain pipe is provided at the water outlet of the outer water tank, and the free end of the first drain pipe and the free end of the second drain pipe are respectively connected to the water inlet of the post-filter assembly. At the same time, a first drain solenoid valve is provided on the first drain pipe, and a second drain solenoid valve is provided on the second drain pipe.

[0018] The control unit can control the on-off state of the first drain solenoid valve, the opening and closing state of the valve cover, the on-off state of the second drain solenoid valve, and whether the hot steam generated during the heating process of the hot tank unit flows into the steam tank according to the water temperature of the inner water tank fed back by the first temperature sensor and the water temperature of the outer water tank fed back by the second temperature sensor.

[0019] Optionally, a boss extending vertically upward is formed at the lower part of the tank cavity of the steam tank, and an annular groove is formed between the outer peripheral surface of the boss and the inner wall of the steam tank. The upper end of the steam inlet pipe connecting the steam tank and the hot tank unit extends to the upper part of the boss.

[0020] The upper end of the return pipe arranged at the lower part of the steam tank is connected to the lower part of the annular groove, and the lower end of the return pipe is connected to the tank cavity of the hot tank unit. A one-way valve is arranged on the return pipe so that the condensed water formed in the steam tank can only flow from the steam tank to the hot tank unit.

[0021] A direct drinking water machine comprises any one of the above-mentioned direct drinking water systems.

[0022] A direct drinking water system control method comprises the following steps:

[0023] Ⅰ) Introducing the steam generated by the hot tank unit into the steam tank to heat the water in the water tank body;

[0024] Ⅱ) The temperature sensor part installed in the water tank body detects the water temperature T in the water tank body in real time, and feeds back the detection result to the control unit in real time;

[0025] III) The control unit compares the pre-set warning threshold value T0 of the water temperature in the water tank body with the water temperature T;

[0026] IV) controlling whether the steam generated by the hot tank unit flows into the steam tank according to the comparison result;

[0027] If the water temperature T is less than the warning threshold T0, the steam generated by the hot tank unit continues to flow into the steam tank;

[0028] If the water temperature T is greater than or equal to the warning threshold T0, the steam generated by the hot tank unit is blocked from flowing into the steam tank.

[0029] Optionally, a pressure sensing unit is provided in the cavity of the steam tank, and a pressure relief solenoid valve is provided on the exhaust pipe.

[0030] In step II), the pressure sensing unit detects the pressure P in the steam tank in real time, and feeds back the detection result to the control unit in real time;

[0031] In step III), the control unit also compares the pressure P with a preset warning threshold value P0 of the pressure in the steam tank.

[0032] In step IV), according to the comparison result, whether the steam generated by the hot tank unit flows into the steam tank is controlled, and the on-off state of the pressure relief solenoid valve 1 is controlled;

[0033] If the pressure P is less than the warning threshold value P0, and the water temperature T is less than the warning threshold value T0, the pressure relief solenoid valve 1 is controlled to remain in the blocked state, and the steam generated by the hot tank unit continues to flow into the steam tank;

[0034] If the pressure P is less than the warning threshold value P0, and the water temperature T is greater than or equal to the warning threshold value T0, the pressure relief solenoid valve 1 is controlled to remain in the blocking state, and the steam generated by the hot tank unit is blocked from flowing into the steam tank;

[0035] If the pressure P is greater than or equal to the warning threshold value P0, and the water temperature T is less than the warning threshold value T0, the pressure relief solenoid valve is controlled to switch to the passage state, and the steam generated by the hot tank unit continues to flow into the steam tank;

[0036] If the pressure P is greater than or equal to the warning threshold value P0, and the water temperature T is greater than or equal to the warning threshold value T0, the pressure relief solenoid valve is controlled to switch to the passage state and block the steam generated by the hot tank unit from flowing into the steam tank.

[0037] Optionally, a pressure relief pipe is provided on the steam inlet pipe, and a second pressure relief solenoid valve is provided on the pressure relief pipe.

[0038] In step IV), the control unit also controls the on-off state of the second pressure relief solenoid valve according to the comparison result between the water temperature T and the warning threshold value T0;

[0039] If the water temperature T is lower than the warning threshold value T0, the pressure relief solenoid valve 2 is controlled to remain in the blocked state;

[0040] If the water temperature T is greater than or equal to the warning threshold value T0, the pressure relief solenoid valve 2 is controlled to switch to the passage state.

[0041] The present invention also relates to a direct drinking water system control method based on a technical solution in which a water tank body is divided into an inner water tank and an outer water tank, comprising the steps of:

[0042] S1. Introducing the steam generated by the hot tank unit into the steam tank to heat the water in the inner water tank;

[0043] S2, the first temperature sensor detects the water temperature T-1 in the inner water tank in real time, and feeds the detection result back to the control unit in real time; the second temperature sensor detects the water temperature T-2 in the outer water tank in real time, and feeds the detection result back to the control unit in real time;

[0044] S3, the control unit compares the preset warning threshold T0-1 of the water temperature of the inner water tank with the water temperature T-1, and compares the preset warning threshold T0-2 of the water temperature of the outer water tank with the water temperature T-2; wherein the warning threshold T0-1 is less than the warning threshold T0-2;

[0045] S4. Based on the comparison result, control the on / off state of the first drain solenoid valve, control the opening and closing state of the valve cover, control whether the hot steam generated by the hot tank unit flows into the steam tank, and control the on / off state of the second drain solenoid valve.

[0046] i) Compare the water temperature T-1 with the warning threshold T0-1;

[0047] If the water temperature T-1 is lower than the warning threshold value T0-1, the control valve cover is kept in the closed state, and the first drain solenoid valve is controlled to switch to the passage state;

[0048] If the water temperature T-1 is greater than or equal to the warning threshold T0-1, the control valve cover is switched to the open state, the first drainage solenoid valve is controlled to switch back to the blocking state, and the second drainage solenoid valve is controlled to switch to the passage state;

[0049] ii) comparing the water temperature T-2 with the warning threshold T0-2;

[0050] If the water temperature T-2 is less than the warning threshold T0-2, the steam generated by the hot tank unit is controlled to continue to flow into the steam tank;

[0051] If the water temperature T-2 is greater than or equal to the warning threshold T0-2, the steam generated by the hot tank unit is blocked from flowing into the steam tank;

[0052] Therefore, in i), the steam generated by the hot tank unit is kept in a state of continuously flowing into the steam tank until the condition that the water temperature T-2 is greater than or equal to the warning threshold T0-2 is reached in ii).

[0053] Optionally, a pressure sensing unit is provided in the cavity of the steam tank, and a pressure relief solenoid valve is provided on the exhaust pipe.

[0054] In step S2, the pressure sensing unit detects the pressure P in the steam tank in real time, and feeds back the detection result to the control unit in real time;

[0055] In step S3, the control unit also compares the pre-set warning threshold value P0 of the pressure in the steam tank with the pressure P;

[0056] In step S4, the on / off state of the pressure relief solenoid valve 1 is controlled according to the comparison result between the pressure P and the warning threshold value P0;

[0057] If the pressure P is less than the warning threshold value P0, the pressure relief solenoid valve 1 is controlled to remain in the blocked state;

[0058] If the pressure P is greater than or equal to the warning threshold value P0, the pressure relief solenoid valve is controlled to switch to the passage state.

[0059] Optionally, a pressure relief pipe is provided on the steam inlet pipe, and a second pressure relief solenoid valve is provided on the pressure relief pipe.

[0060] In step S4, the control unit also controls the on-off state of the second pressure relief solenoid valve according to the comparison result between the water temperature T-2 and the warning threshold T0-2;

[0061] If the water temperature T-2 is less than the warning threshold T0-2, the pressure relief solenoid valve 2 is controlled to remain in the blocked state;

[0062] If the water temperature T-2 is greater than or equal to the warning threshold T0-2, the pressure relief solenoid valve 2 is controlled to switch to the passage state.

[0063] The beneficial effect of the present invention is that the present invention can overcome the adverse effect of raw water temperature on the water production ratio of the direct drinking water purifier. The direct drinking water system, direct drinking water machine and control method provided by the present invention can effectively utilize the steam generated by the direct drinking water purifier when heating the purified water, and use it to preheat the water flowing to the reverse osmosis membrane filtration unit, so that the water temperature flowing into the reverse osmosis membrane filtration unit is in a better range, which can not only realize the recycling of the heat energy of the steam, but also improve the water production rate of the purified water. In particular, when the water source temperature is at a low temperature, the extent to which the purified water / direct drinking water production rate is increased is very obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a structural schematic diagram of the direct drinking water system involved in the present invention.

[0065] Figure 2 Schematic diagram of the optimized structure of the water tank unit in the direct drinking water system.

[0066] In the figure: 10 pre-filter assembly, 11 PP cotton filter unit, 12 activated carbon filter unit, 13 water supply pump, 14 pressure regulating pump, 15 water inlet solenoid valve 1; 20 post-filter assembly, 21 reverse osmosis membrane filter unit, 22 drainage solenoid valve 1, 23 water storage tank; 30 hot tank unit, 31 water inlet pipe 1, 311 water inlet solenoid valve 2, 32 drainage pipe 1, 33 temperature sensor unit 1; 40 water tank unit, 41 water tank body, 42 steam tank; 411 water inlet pipe 2, 4 12 Drain pipe two, 413 temperature sensor part two; 421 steam inlet pipe, 422 exhaust pipe, 423 pressure relief solenoid valve one, 424 pressure sensing part, 425 pressure relief pipe, 426 pressure relief solenoid valve two, 427 reflux pipe; 100 inner water tank, 200 outer water tank, 300 valve cover part; 101 first temperature sensor, 102 first drain pipe, 103 first drain solenoid valve; 201 second temperature sensor, 202 second drain pipe, 203 second drain solenoid valve. DETAILED DESCRIPTION

[0067] The structures, proportions, sizes, etc. illustrated in the drawings of the 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 contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0068] like Figure 1 A direct drinking water system shown in the figure includes a pre-filter assembly 10, a post-filter assembly 20, a hot tank unit 30, a water tank unit 40 and a control unit (not shown in the figure). The water tank unit 40 includes a water tank body 41 and a steam tank 42 arranged inside the water tank body 41. The pre-filter assembly 10, the water tank body 41, the post-filter assembly 20, the hot tank unit 30 and the steam tank 42 are in a relative configuration relationship of being connected in series in sequence.

[0069] The pre-filter assembly 10 includes a PP cotton filter unit 11 and an activated carbon filter unit 12 which are connected in sequence. The water inlet end of the PP cotton filter unit 11 is connected to a water source. The water outlet end / drainage end of the activated carbon filter unit 12 is connected to the water inlet end of the water tank body 41 through a second water inlet pipe 411.

[0070] The water supply pump 13, the pressure regulating pump 14 and the water inlet solenoid valve 15 are arranged on the pipeline of the water inlet pipe 2 411. The water inlet solenoid valve 15 can be controlled by the control unit to switch its on / off state, and selectively cause the water inlet pipe 2 411 to establish a conducting flow channel and a closed flow channel between the pre-filter assembly 10 and the water tank body 41.

[0071] The post-filter assembly 20 includes a reverse osmosis membrane filter unit 21, and a multi-stage reverse osmosis membrane filter column is provided in the illustrated scheme. The water inlet end of the post-filter assembly 20 is connected to the water outlet end of the water tank body 41 through a drain pipe 2 412. As shown in the illustrated scheme, a water storage tank 23 is provided at the water outlet end of the post-filter assembly 20 to store the produced clean water.

[0072] A drainage solenoid valve 1 22 is disposed on the drainage pipe 2 412. The drainage solenoid valve 1 22 can be controlled by the control unit to switch its on / off / on / off state, and selectively cause the drainage pipe 2 412 to establish a conducting flow channel and a closed flow channel between the water tank body 41 and the post-filter assembly 20.

[0073] The hot tank unit 30 can heat the direct drinking water stored in the tank body of the hot tank unit 30 before supplying the direct drinking water (via the drain pipe 32 to the outside). The hot tank unit 30 includes an inlet pipe 31, a drain pipe 32, a temperature sensor part 33 and a steam outlet (connected to the steam inlet pipe 421, which will be mentioned below) arranged on its tank body. The hot tank unit 30 is connected to the drainage end of the post-filter assembly 20 through the inlet pipe 31, and the drain pipe 32 of the hot tank unit 30 is connected to an external faucet. The temperature sensor part 33 of the hot tank unit 30 is connected to the control unit, so that the control unit can control the water temperature of the hot tank unit 30 according to the temperature condition fed back by the temperature sensor part 33, that is, control the heating state of the hot tank unit 30. In view of the fact that the hot tank unit 30 belongs to the scope of the prior art, its detailed structural features will not be described in detail.

[0074] The water inlet solenoid valve 2 311 is provided on the water inlet pipe 1 31. When the water storage tank 23 is provided, the water inlet solenoid valve 2 311 is provided on the downstream side of the water storage tank 23. The water inlet solenoid valve 2 311 can be controlled by the control unit to switch its on / off / on / off state, and selectively cause the water inlet pipe 1 31 to establish a conducting flow channel and a closed flow channel between the post-filter assembly 20 and the hot tank unit 30.

[0075] The water inlet of the water tank body 41 is connected to the water outlet of the pre-filter assembly 10, and the water outlet of the water tank body 41 is connected to the water inlet of the post-filter assembly 20. Therefore, the water tank body 41 can store water treated by the pre-filter assembly 10 and can continuously supply the water to the post-filter assembly 20 under the control of the control unit.

[0076] The steam inlet end of the steam tank 42 is connected to the steam outlet of the hot tank unit 30 through a steam inlet pipe 421, so that the hot steam generated by the hot tank unit 30 during the heating process can be introduced into the cavity of the steam tank 42, and the heat of the steam is transferred to the water in the water tank body 41 through the wall of the steam tank 42 to heat the water in the water tank body 41. The steam outlet end of the steam tank 42 is provided with a steam outlet pipe 422 connected to the outside.

[0077] In order to establish a good heat conduction state between the steam tank 42 and the water tank body 41, the structure of the steam tank 42 can be optimized and improved, such as adding heat conduction fins to the tank body to improve the heat conduction efficiency; setting multiple columnar cavities on the upper part of the tank body to increase the heat conduction area, etc.

[0078] A temperature sensor part 2 413 is provided in the cavity of the water tank body 41, and a control unit can control whether the hot steam generated by the hot tank unit 30 during the heating process flows into the steam tank 42 according to the water temperature in the water tank body 41 fed back by the temperature sensor part 2 413.

[0079] By providing the steam tank 42, on the one hand, the hot steam generated during the heating process of the hot tank unit 30 can be better utilized to quickly and relatively evenly heat the water entering the water tank body 41, thereby realizing the recovery and utilization of steam thermal energy and promoting efficient recovery and utilization of steam thermal energy; on the other hand, it can also promote the hot tank unit 30 (the inside of the tank cavity) to maintain a low pressure state, which helps to extend the service life of the direct drinking water system and the hot tank unit 30, improve the safety performance of the hot tank unit 30, and effectively suppress the occurrence of accidents that may be caused by the hot tank unit 30 being in a high pressure state for a long time.

[0080] A pressure sensing unit 424 or pressure sensor unit is provided in the cavity of the steam tank 42. The control unit can control whether the hot steam generated during the heating process of the hot tank unit 30 flows into the steam tank 42, and control the on-off state of the pressure relief solenoid valve 1 423 provided on the exhaust pipe 422, according to the pressure feedback from the pressure sensing unit 424 and the water temperature feedback from the temperature sensor unit 2 413 provided in the water tank body 41. For example, when the pressure in the steam tank 42 reaches the set warning pressure threshold and the water temperature in the water tank body 41 does not reach the preset temperature, the control unit controls the pressure relief solenoid valve 423 provided on the exhaust pipe 422 to switch to the passage state to relieve the pressure inside the steam tank 42 while continuing to heat the water in the water tank body 41 (using steam); conversely, when the pressure in the steam tank 42 does not reach the set warning pressure threshold, but the water temperature in the water tank body 41 has reached the warning temperature threshold, the control unit controls the solenoid valve (not shown in the figure) provided on the steam inlet pipe 421 between the hot tank unit 30 and the steam tank 42 to switch to the disconnected / blocked state to block the hot steam generated during the heating process of the hot tank unit 30 from continuing to flow into the steam tank 42, and to block the continued heating of the water in the water tank body 41 (using steam).

[0081] The pressure state in the steam tank 42 fed back by the pressure sensing unit 424 can reflect the pressure situation in the hot tank unit 30, because the two are kept in a connected state for a period of time, during which the pressures inside the two are basically in a relatively balanced state, or the pressure in the hot tank unit 30 will be relatively higher, but the pressure difference will not be too large.

[0082] When the temperature sensor part 1 33 provided in the hot tank unit 30 detects that the water in the hot tank unit 30 has not been heated to a predetermined temperature range, the control unit will control the water inlet solenoid valve 2 311 to switch to a closed state to prevent the hot tank unit 30 from being replenished with cold water; at the same time, the hot tank unit 30 is controlled to continuously heat the water inside it. The steam generated by the hot tank unit 30 during the heating process will continuously flow into the steam tank 42 to achieve the purpose of pressure relief and heat energy recovery.

[0083] When the pressure sensing unit 424 detects that the pressure in the steam tank 42 reaches the set warning pressure threshold, and the temperature sensor unit 33 detects that the water in the hot tank unit 30 has not yet been heated to the predetermined temperature range, the control unit controls the pressure relief solenoid valve 423 disposed on the exhaust pipe 422 to switch to the passage state to relieve the pressure inside the steam tank 42, and the hot tank unit 30 is still kept in the state of heating the water inside.

[0084] When the temperature sensor part 1 33 detects that the water in the hot tank unit 30 reaches a predetermined temperature range, the control unit controls the water inlet solenoid valve 2 311 to switch to a conducting state / passage state.

[0085] A pressure relief pipe 425 is provided on the steam inlet pipe 421 connecting the steam tank 42 and the hot tank unit 30, and a pressure relief solenoid valve 426 is provided on the pressure relief pipe 425. The control unit can also control the on-off state of the pressure relief solenoid valve 426 according to the pressure feedback from the pressure sensor 424 provided in the steam tank 42 and the water temperature feedback from the temperature sensor 413 provided in the water tank body 41. For example, when the pressure in the steam tank 42 reaches the set warning pressure threshold, and the water temperature in the water tank body 41 has also reached the warning temperature threshold, the control unit controls the pressure relief solenoid valve 426 to switch to the passage state to relieve pressure; in the initial state, the pressure relief solenoid valve 426 remains in the closed state.

[0086] like Figure 2 As shown, the water tank body 41 includes an inner water tank 100 and an outer water tank 200. At the same time, a plurality of valve cover parts 300 are provided on the wall of the inner water tank 100, and the control unit can control the opening / closing state of the valve cover parts 300 to selectively switch the cavity of the inner water tank 100 and the cavity of the outer water tank 200 between the connected state and the blocked state.

[0087] The steam tank 42 is disposed in the cavity of the inner water tank 100 and can directly heat the water in the inner water tank 100 .

[0088] The water inlet end of the inner water tank 100 is connected to the water outlet end of the pre-filter assembly 10 .

[0089] The temperature sensor part 2 413 disposed in the water tank body 41 includes a first temperature sensor 101 disposed in the inner water tank 100 and a second temperature sensor 201 disposed in the outer water tank 200 .

[0090] A first drain pipe 102 is provided at the water outlet end of the inner water tank 100, and a second drain pipe 202 is provided at the water outlet end of the outer water tank 200, and the free end of the first drain pipe 102 and the free end of the second drain pipe 202 are respectively connected to the water inlet end of the post-filter assembly 20, that is, they are respectively connected to the drain pipe 2 412.

[0091] The first drain pipe 102 is provided with a first drain solenoid valve 103, and the second drain pipe 202 is provided with a second drain solenoid valve 203. After the first drain solenoid valve 103 and the second drain solenoid valve 203 are provided, the drain solenoid valve 22 provided can be cancelled or retained.

[0092] The control unit can control the on / off state of the first drain solenoid valve 103 and the opening / closing state of the valve cover 300, or the on / off state of the second drain solenoid valve 203, respectively, according to the water temperature of the inner water tank 100 fed back by the first temperature sensor 101. At the same time, the control unit can also control whether the hot steam generated during the heating process of the hot tank unit 30 flows into the steam tank 42 and / or control the on / off state of the second drain solenoid valve 203, according to the water temperature of the outer water tank 200 fed back by the second temperature sensor 201.

[0093] The water tank body 41 is divided into the inner water tank 100 and the outer water tank 200. The volume ratio between the inner and outer water tanks is generally set according to the power size (of the steam tank 42). This can better and effectively deal with the unfavorable situation when the water source temperature is in a low temperature state (the water temperature is lower than 20 degrees Celsius or 22 degrees Celsius), that is, it can improve the ability to improve the water temperature entering the reverse osmosis membrane filtration unit 21. On the one hand, the water entering the inner water tank 100 can be quickly heated to a preset (required) state, and can be quickly introduced into the post-filtration assembly 20, and reverse osmosis treatment is performed in the reverse osmosis membrane filtration unit 21 with a relatively high clean water output ratio to obtain direct drinking clean water. On the other hand, the degree of uniformity of heating the water in the inner water tank 100 can also be improved, because the steam tank 42 penetrates the cavity of the inner water tank 100 in the vertical direction (longitudinal direction), so by separately setting the inner water tank 100 and the outer water tank 200, the heat transfer depth between the steam tank 42 and the water entering the water tank body 41 can be reduced in the horizontal direction, and the heat of the steam can be quickly and evenly transferred to the water around the outer periphery of the steam tank 42 through the wall of the steam tank 42. In addition, when the water in the inner water tank 100 is heated to a preset temperature range, the water in the outer water tank 200 can be quickly and evenly caused to reach the required water temperature state by controlling the opening of the plurality of valve cover parts 300, and can be directly introduced into the post-filter assembly 20 without waiting.

[0094] In an initial state, that is, when the water temperature of the inner water tank 100 is lower than a warning threshold set therefor, the valve cover portion 300 is kept in a closed state.

[0095] A cone-shaped boss extending vertically upward is formed at the lower part of the tank cavity of the steam tank 42, and an annular groove is formed between the outer peripheral surface of the cone-shaped boss and the inner wall of the steam tank 42. The upper end of the steam inlet pipe 421 connecting the steam tank 42 and the hot tank unit 30 extends to the upper part of the cone-shaped boss, which should be understood as a situation where the height position of the upper port of the steam inlet pipe 421 is not lower than the height position of the upper end surface of the cone-shaped boss, or the upper port of the steam inlet pipe 421 extends to the upper part of the body of the cone-shaped boss and at this time the height position of the upper port of the steam inlet pipe 421 is slightly lower than the height position of the upper end surface of the cone-shaped boss.

[0096] The upper end of the return pipe 427 provided at the lower part of the steam tank 42 is connected to the lower part of the annular groove, and the lower end of the return pipe 427 is connected to the tank cavity of the hot tank unit 30. A one-way valve (not shown) is provided on the return pipe 427, so that the condensed water formed in the steam tank 42 can only flow from the steam tank 42 to the hot tank unit 30.

[0097] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A direct drinking water system, comprising a pre-filter assembly (10), a post-filter assembly (20) and a hot tank unit (30); the post-filter assembly (20) comprises a reverse osmosis membrane filter unit (21); a water inlet end of the hot tank unit (30) is connected to a water outlet end of the post-filter assembly (20); a steam outlet is provided on the hot tank unit (30); the system is characterized by: It also includes a water tank unit (40) and a control unit; the water tank unit (40) includes a water tank body (41) and a steam tank (42) disposed in the water tank body (41); The water inlet end of the water tank body (41) is connected to the water outlet end of the front filter assembly (10); the water outlet end of the water tank body (41) is connected to the water inlet end of the rear filter assembly (20); the steam inlet pipe (421) of the steam tank (42) is connected to the steam outlet of the hot tank unit (30), and can introduce the steam generated by the hot tank unit (30) into the inner cavity of the steam tank (42) to heat the water in the water tank body (41); the steam outlet end of the steam tank (42) is provided with a steam outlet pipe (422) connected to the outside; A temperature sensor unit is provided in the cavity of the water tank body (41), and the control unit can control whether the steam generated by the hot tank unit (30) flows into the steam tank (42) according to the water temperature in the water tank body (41) fed back by the temperature sensor unit; A boss extending vertically upward is formed at the lower part of the tank cavity of the steam tank (42), and an annular groove is formed between the outer peripheral surface of the boss and the inner wall of the steam tank (42); the upper end of the steam inlet pipe (421) extends to the upper part of the boss; The upper end of a return pipe (427) provided at the lower part of the steam tank (42) is connected to the lower part of the annular groove; the lower end of the return pipe (427) is connected to the hot tank unit (30); a one-way valve is provided on the return pipe (427) so that condensed water can only flow from the steam tank (42) to the hot tank unit (30); A pressure sensing unit (424) is provided in the cavity of the steam tank (42); the control unit is capable of controlling whether the hot steam generated by the hot tank unit (30) flows into the steam tank (42) and controlling the on / off state of a pressure relief solenoid valve 1 (423) provided on the steam exhaust pipe (422) according to the pressure feedback from the pressure sensing unit (424) and / or the water temperature feedback from the temperature sensor unit provided in the water tank body (41); The water tank body (41) comprises an inner water tank (100) and an outer water tank (200); at least one valve cover portion (300) is provided on the wall of the inner water tank (100), and a control unit can control the opening and closing state of the valve cover portion (300) to selectively switch the inner water tank (100) and the outer water tank (200) between a connected state and a blocked state; a steam tank (42) is provided in the cavity of the inner water tank (100), and a water inlet end of the inner water tank (100) is connected to a water outlet end of the pre-filter assembly (10); The temperature sensor unit provided in the water tank body (41) comprises a first temperature sensor (101) provided in the inner water tank (100) and a second temperature sensor (201) provided in the outer water tank (200); a first drainage pipe (102) is provided at the water outlet end of the inner water tank (100), and a second drainage pipe (202) is provided at the water outlet end of the outer water tank (200), and the free ends of the two drainage pipes are respectively connected to the water inlet end of the post-filter assembly (20); a first drainage solenoid valve (103) is provided on the first drainage pipe (102), and a second drainage solenoid valve (203) is provided on the second drainage pipe (202); The control unit can control the on / off state of the first drainage solenoid valve (103), the open / closed state of the valve cover (300), the on / off state of the second drainage solenoid valve (203), and control whether the hot steam generated by the hot tank unit (30) flows into the steam tank (42) according to the water temperature of the inner water tank (100) fed back by the first temperature sensor (101) and the water temperature of the outer water tank (200) fed back by the second temperature sensor (201).

2. The direct drinking water system according to claim 1, characterized in that: A pressure relief pipe (425) is provided on the steam inlet pipe (421), and a second pressure relief solenoid valve (426) is provided on the pressure relief pipe (425); The control unit can also control the on / off state of the second pressure relief solenoid valve (426) according to the pressure condition fed back by the pressure sensing unit (424) and / or the water temperature condition fed back by the temperature sensor unit provided in the water tank body (41).

3. A direct drinking water machine, characterized in that it comprises the direct drinking water system described in claim 1 or 2.

4. A direct drinking water system control method based on the direct drinking water system of claim 1, characterized in that it comprises the steps of: Ⅰ) introducing the steam generated by the hot tank unit (30) into the steam tank (42) to heat the water in the water tank body (41); II) The temperature sensor part provided in the water tank body (41) detects the water temperature T in the water tank body (41) in real time, and feeds back the detection result to the control unit in real time; III) the control unit compares a preset warning threshold value T0 of the water temperature in the water tank body (41) with the water temperature T; IV) controlling whether the steam generated by the hot tank unit (30) flows into the steam tank (42) according to the comparison result; If the water temperature T is less than the warning threshold value T0, the steam generated by the hot tank unit (30) continues to flow into the steam tank (42); If the water temperature T is greater than or equal to the warning threshold value T0, the steam generated by the hot tank unit (30) is blocked from flowing into the steam tank (42).

5. The direct drinking water system control method according to claim 4 is characterized by: A pressure sensing part (424) is provided in the cavity of the steam tank (42); a pressure relief solenoid valve (423) is provided on the steam exhaust pipe (422); In step II), the pressure sensing unit (424) detects the pressure P in the steam tank (42) in real time, and feeds back the detection result to the control unit in real time; In step III), the control unit also compares a preset warning threshold value P0 of the pressure in the steam tank (42) with the pressure P; In step IV), the on / off state of the pressure relief solenoid valve 1 (423) is also controlled according to the comparison result between the pressure P and the warning threshold value P0; If the pressure P is less than the warning threshold value P0, the pressure relief solenoid valve 1 (423) is controlled to remain in the blocked state; If the pressure P is greater than or equal to the warning threshold value P0, the pressure relief solenoid valve 1 (423) is controlled to switch to the passage state.

6. The direct drinking water system control method according to claim 5 is characterized by: A pressure relief pipe (425) is provided on the steam inlet pipe (421), and a second pressure relief solenoid valve (426) is provided on the pressure relief pipe (425); In step IV), the control unit also controls the on / off state of the second pressure relief solenoid valve (426) according to the comparison result between the water temperature T and the warning threshold value T0; If the water temperature T is less than the warning threshold value T0, the pressure relief solenoid valve 2 (426) is controlled to remain in the blocked state; If the water temperature T is greater than or equal to the warning threshold value T0, the pressure relief solenoid valve 2 (426) is controlled to switch to the passage state.

7. A direct drinking water system control method based on the direct drinking water system of claim 1, characterized in that it comprises the steps of: S1, introducing the steam generated by the hot tank unit (30) into the steam tank (42) to heat the water in the inner water tank (100); S2, the first temperature sensor (101) detects the water temperature T-1 in the inner water tank (100) in real time, and feeds back the detection result to the control unit in real time; The second temperature sensor (201) detects the water temperature T-2 in the external water tank (200) in real time, and feeds back the detection result to the control unit in real time; S3, the control unit compares the preset warning threshold T0-1 of the water temperature of the inner water tank (100) with the water temperature T-1, and compares the preset warning threshold T0-2 of the water temperature of the outer water tank (200) with the water temperature T-2; wherein, The warning threshold T0-1 is less than the warning threshold T0-2; S4. Based on the comparison result, the on / off state of the first drainage solenoid valve (103) is controlled, the opening and closing state of the control valve cover (300) is controlled, the on / off state of the second drainage solenoid valve (203) is controlled, and whether the hot steam generated by the hot tank unit (30) flows into the steam tank (42) is controlled.

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