Heat exchange system, water purification equipment and control method

Abstract

The invention relates to the field of electrical equipment, and discloses a heat exchange system, water purification equipment and a control method. The heat exchange system provides large-flow boiled water, shortens the waiting time of a user for taking the boiled water, can provide warm boiled water at different temperatures, conforms to water drinking habits of Chinese people, can preheat normal-temperature water through the boiled water, and improves the heating efficiency. The heat exchange system comprises a water supply module, a heating module, a heat exchange module, a temperature detection part, a heat preservation part and a control unit, the heating module is communicated with the water supply module and used for heating normal-temperature water or preheated warm raw water into boiled water, and the heat exchange module is communicated with the water supply module and the heating module and used for heating the boiled water. The boiled water is used for preheating normal-temperature water, storing the preheated warm raw water, cooling the boiled water into warm boiled water and storing the warm boiled water, the heat preservation part is arranged on the heat exchange module and used for conducting heat preservation on water in the heat exchange module, the signal input end of the control unit is electrically connected with the temperature detection part, and the signal output end of the control unit is electrically connected with the water supply module and the heating module.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a heat exchange system, a water purification device and a control method. Background Art

[0002] A household water purifier is a common household appliance that is used to deeply filter and purify water to provide users with drinking water that meets their needs.

[0003] In order to meet people's demand for hot water at any time, the water purifier is equipped with an instant hot faucet to create an all-in-one purifier and heat machine. Since the maximum current of the power limit of a general non-air-conditioning socket is 10A, the power of the whole machine can only be limited to 2200W, resulting in the instant hot faucet's boiling water flow rate of only 400mL / min. Users have a long waiting time when getting hot water, and the user experience is not good. Moreover, since the instant hot faucet uses an instant heating method, there are also problems such as simply heating the room temperature water to the set temperature to produce uncooked water, and the excessive volume of room temperature water during the heating process leads to low heating efficiency. Summary of the invention

[0004] In view of this, the present invention provides a heat exchange system, a water purification device and a control method to solve the problems of the existing water purifier taking a long time to boil water, producing uncooked water and having low heating efficiency.

[0005] In a first aspect, the present invention provides a heat exchange system, comprising:

[0006] Water supply module;

[0007] A heating module is connected to the water supply module, and is used to heat room temperature water or preheated raw water into boiling water;

[0008] a heat exchange module, connected to the water supply module and the heating module, wherein the heat exchange module preheats the normal temperature water with boiling water and stores the preheated warm raw water, and cools the boiling water into warm boiled water and stores the warm boiled water;

[0009] A temperature detection element, used to detect the temperature of water stored in the heat exchange module;

[0010] A heat-insulating component, disposed in the heat exchange module, for keeping the water in the heat exchange module warm;

[0011] A control unit, wherein a signal input end thereof is electrically connected to the temperature detection element, and a signal output end thereof is electrically connected to the water supply module and the heating module.

[0012] Beneficial effects: The heat exchange system of the present invention includes a water supply module, a heating module, a heat exchange module, a temperature detection component, a heat insulation component and a control unit, wherein the heat exchange module can use boiled water to preheat normal temperature water and store the preheated warm raw water, and at the same time cool the boiled water into warm boiled water and store the warm boiled water, and the heat insulation component can insulate the water in the heat exchange module, so that the water stored in the heat exchange module is water with a certain temperature, which can improve the heating efficiency of the heating module. When providing boiled water to the user, the heat exchange system of the present invention provides a large flow of boiled water within a period of time, which can greatly shorten the waiting time for the user to get boiled water and improve the user experience. Moreover, the heat exchange module can store warm boiled water, and can use warm boiled water and boiled water to mix to provide users with warm boiled water of different temperatures, which is in line with the drinking water habits of Chinese people, and at the beginning of the user's water collection, since the heat exchange module stores warm boiled water, the user does not need to take out too much cold water (normal temperature water), realizing the "zero cold water" function, so that the user experience is better.

[0013] In an optional embodiment, the heat exchange module includes a first pipeline and a second pipeline that are sleeved, the first pipeline includes a first pipeline water inlet and a first pipeline water outlet, the second pipeline includes a second pipeline water inlet and a second pipeline water outlet, the heating module includes a heating module water inlet and a heating module water outlet, the first pipeline water inlet is connected to the water supply module, the first pipeline water outlet is connected to the heating module water inlet, the heating module water outlet is connected to the second pipeline water inlet, and the second pipeline water outlet is connected to the total water outlet.

[0014] Beneficial effects: The heat exchange system of the present invention comprises a heat exchange module including a first pipe and a second pipe, the first pipe is connected to the water supply module and is suitable for introducing normal temperature water and conveying the normal temperature water to the heating module, the second pipe is suitable for introducing boiled water, the normal temperature water in the first pipe and the boiled water in the second pipe can exchange heat without contact, so that the normal temperature water is preheated to warm raw water, and the boiled water is cooled to warm boiled water, the first pipe can also store warm raw water, and the second pipe can also store warm boiled water. The structural design of this heat exchange module is ingenious, the heat exchange efficiency is high, the normal temperature water and the boiled water exchange heat without contact, and they will not affect each other except for heat exchange, and the structure is compact, the volume is small, and it is easy to install and set.

[0015] In an optional embodiment, the first pipeline is sleeved on the outside of the second pipeline, and a water flow space is formed between the inner wall of the first pipeline and the outer wall of the second pipeline.

[0016] Beneficial effect: In the heat exchange system of the present invention, the first pipeline is sleeved on the outside of the second pipeline, and a water flow space is formed between the inner wall of the first pipeline and the outer wall of the second pipeline. The water flow space forms a normal temperature water channel, and a boiled water channel is formed in the second pipeline. The normal temperature water and boiled water exchange heat through heat transfer on the side wall of the second pipeline, thereby achieving the purpose of preheating the normal temperature water and cooling the boiled water. The design of the above-mentioned heat exchange module is ingenious, which can reduce the loss of thermal energy of boiled water, make full use of the thermal energy of boiled water, and improve the heat exchange efficiency.

[0017] In an optional embodiment, a regulating member is further included, wherein a water inlet of the regulating member is connected to a water outlet of the heating module and / or a water outlet of the second pipeline, and a water outlet of the regulating member is connected to the total water outlet.

[0018] Beneficial effect: In the heat exchange system of the present invention, the water inlet of the regulating member is connected to the water outlet of the heating module and / or the water outlet of the second pipeline, and the water outlet of the regulating member is connected to the main water outlet. By setting the regulating member, warm boiled water and boiled water can be mixed to prepare warm cooked water of the temperature required by the user, thereby realizing the full-temperature range cooked water function, and the output of boiled water can also be achieved through the regulating member.

[0019] In an optional embodiment, it also includes a water circuit switching control component, the water inlet of the water circuit switching control component is connected to the water outlet of the water supply module, and the water outlet of the water circuit switching control component is connected to the water inlet of the first pipeline or the water inlet of the heating module.

[0020] Beneficial effect: The heat exchange system of the present invention can conveniently realize the switching of different water circuits by setting a water circuit switching control component, so as to improve the control efficiency of the heat exchange system and the speed of mode switching.

[0021] In an optional embodiment, the water circuit switching control component is a dual-channel solenoid valve.

[0022] Beneficial effects: In the heat exchange system of the present invention, the water circuit switching control component adopts a dual-channel battery valve. This dual-channel solenoid valve has low cost, small size, short response time, and is suitable for use in water purification equipment.

[0023] In an optional implementation, the thermal insulation component is disposed in the first pipeline.

[0024] Beneficial effect: In the heat exchange system of the present invention, the insulation component is arranged in the first pipeline. Since the first pipeline is arranged on the outside of the second pipeline, compared with the second pipeline, the water in the first pipeline is more easily cooled down due to heat loss. The insulation component is arranged in the first pipeline, so that the water in the first pipeline is closer to the insulation component, which is conducive to quickly increasing the temperature of the water in the first pipeline and improving the heating and insulation efficiency.

[0025] In a second aspect, the present invention further provides a water purification device, comprising a device body and the above-mentioned heat exchange system, wherein the heat exchange system is arranged in the device body.

[0026] Because the water purification equipment of the present invention includes the heat exchange system of the present invention and has the same beneficial effects as the heat exchange system of the present invention, it will not be described in detail here.

[0027] In an optional embodiment, the water purification equipment is a water purifier.

[0028] Beneficial effects: The water purification equipment of the present invention, specifically a water purifier, can provide users with large-flow boiling water and continuous boiling water, and can also provide warm boiled water at different temperatures. At the same time, a large amount of cold water will not flow out when the user starts to take water. The heat exchange efficiency is high, and the time for taking boiled water is short, which can greatly improve the user experience.

[0029] In a third aspect, the present invention further provides a control method for controlling the above-mentioned heat exchange system or for controlling the above-mentioned water purification equipment, the control method comprising:

[0030] When water is not taken, if there is no water in the heating module and the heat exchange module, the water supply module supplies normal temperature water to the heating module and the heat exchange module, and the heat preservation component is started to heat the normal temperature water in the heat exchange module to the temperature T1; if there is water in the heating module and the heat exchange module, when the temperature of the water in the heat exchange module is less than or equal to T1, the heat preservation component is started to heat the water in the heat exchange module to the temperature T1;

[0031] When taking boiled water, when the water temperature in the heat exchange module is greater than T2, it operates in a large flow boiled water mode, the water supply module supplies normal temperature water to the first pipeline at a flow rate of L1, the normal temperature water is preheated by the water in the second pipeline and then heated to T3 to become preheated warm raw water, the heating module is started at power P1 to heat the preheated warm raw water into boiled water, and the boiled water flows out from the main water outlet;

[0032] When taking boiled water, when the water temperature in the heat exchange module is less than or equal to T2, it operates in a continuous boiled water mode, the water supply module supplies normal temperature water to the heating module at a flow rate of L2, the heating module starts at a power of P2 to heat the normal temperature water into boiled water, and the boiled water flows out from the main water outlet;

[0033] When taking warm boiled water, the water supply module supplies normal temperature water to the first pipeline at a flow rate of L3, and the heating module heats the normal temperature water into boiling water. Part of the boiled water enters the second pipeline and is cooled to T4 to become warm boiled water, and then transported to the regulating member, and the other part of the boiled water is directly transported to the regulating member, and the regulating member mixes the boiling water and the warm boiled water into warm boiled water of the required temperature, and the warm boiled water flows out from the main water outlet.

[0034] Because the control method of the present invention includes the heat exchange system of the present invention or includes the water purification equipment of the present invention, it has the same beneficial effects as the heat exchange system and water purification equipment of the present invention, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 is an overall schematic diagram of the heat exchange system of the present invention;

[0037] Figure 2 It is a schematic diagram of the heat exchange system of the present invention in a large flow boiling water mode;

[0038] Figure 3 Schematic diagram of the heat exchange system of the present invention in the continuous boiling water mode;

[0039] Figure 4 It is a schematic diagram of the heat exchange system of the present invention in the full-temperature section cooked water mode;

[0040] Figure 5 Flow chart of the control method of the present invention.

[0041] Description of reference numerals:

[0042] 1. Heating module; 101. Water inlet of heating module; 102. Water outlet of heating module;

[0043] 2. Insulation parts;

[0044] 3. First pipeline; 301. First pipeline water inlet; 302. First pipeline water outlet;

[0045] 4. Second pipeline; 401. Water inlet of the second pipeline; 402. Water outlet of the second pipeline;

[0046] 5. Main water outlet;

[0047] 6. Adjustment parts;

[0048] 7. Waterway switching control components;

[0049] 8. Temperature sensing package;

[0050] 9. Water purification micro pump. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0052] Some water purification equipment on the market can provide water at different temperatures, but they directly heat room temperature water (raw water) to the required temperature, forming warm raw water without boiling, which does not conform to the drinking water habits of Chinese people and can easily cause physical discomfort. Some water purification equipment can also provide boiled water, but the water flow rate is only 400ml / min, the waiting time for water collection is too long, and the user experience is not good.

[0053] Combine the following Figure 1-Figure 5 , describing embodiments of the heat exchange system, water purification equipment and control method of the present invention.

[0054] According to an embodiment of the present invention, a heat exchange system is provided, including: a water supply module, a heating module 1, a heat exchange module, a temperature detection component, a heat insulation component 2 and a control unit, the heating module 1 is connected with the water supply module, the heating module 1 is used to heat room temperature water or preheated warm raw water into boiling water, the heat exchange module is connected with the water supply module and the heating module 1, the heat exchange module uses boiling water to preheat room temperature water and stores the preheated warm raw water, and at the same time cools the boiled water into warm boiled water and stores the warm boiled water, the temperature detection component is used to detect the temperature of the water stored in the heat exchange module, the heat insulation component 2 is arranged in the heat exchange module, and is used to keep the water in the heat exchange module warm, and the control unit has a signal input end electrically connected to the temperature detection component, and a signal output end electrically connected to the water supply module and the heating module 1.

[0055] In this heat exchange system, the heat exchange module can use boiled water to preheat room temperature water and store the preheated warm raw water, and at the same time cool the boiled water into warm boiled water and store the warm boiled water, and the insulation component 2 can insulate the water in the heat exchange module, so that the water stored in the heat exchange module is water with a certain temperature, which can improve the heating efficiency of the heating module 1. When providing boiled water to the user, the heat exchange system of this embodiment provides a large flow of boiled water within a period of time, which can greatly shorten the waiting time for the user to get boiled water and improve the user experience. Moreover, the heat exchange module can store warm boiled water, and can use warm boiled water and boiled water to mix to provide users with warm boiled water of different temperatures, which is in line with the drinking water habits of Chinese people, and at the beginning of the user's water collection, since the heat exchange module stores warm boiled water, the user does not need to take out too much cold water (room temperature water), realizing the "zero cold water" function, so that the user experience is better.

[0056] The water supply module is used to provide normal temperature water, which can be water from the tap water network or water purified by water purification equipment. It can be selected and set according to the use scenario of the heat exchange system. Under the control of the control unit, the water supply flow of the water supply module can be adjusted to achieve different modes of water intake process.

[0057] The water supply module has different system characteristics according to the quality of the raw water, that is, the water supply system may include a water supply system with a filter element for real-time purification of the water source, or a water supply system without a filter element and without real-time purification. Specifically, when the raw water is of drinking water quality, the water supply module may include a non-purification system, and when the raw water quality is of non-drinking water quality, the water supply module may have a corresponding purification system to purify the raw water quality into water that meets the drinking standard. The purification system may have a single or combined form of a pretreatment module and a deep treatment module, wherein the pretreatment module can realize the preliminary filtration of water to remove pollutants such as sediment, rust, and residual chlorine, and can be a combination or composite form of a primary filter element and an activated carbon filter element, the primary filter element can be a PP cotton filter element, an ultrafiltration filter element, and the activated carbon filter element can be a granular activated carbon, carbon fiber or carbon rod filter element. The deep treatment module can realize the deep filtration of water to remove toxic and harmful substances such as heavy metals and microorganisms, and can be one or more combinations of ultrafiltration, nanofiltration or reverse osmosis filtration modules.

[0058] The water supply module can deliver water at normal temperature through delivery equipment (such as a pressure-stabilizing pump, etc.).

[0059] like Figure 1 As shown, in this embodiment, the heat exchange system is applied to a water purification device, and the water supply module provides purified water at room temperature required for drinking. The water supply module includes a water purification micro pump 9, which is used to control the water supply flow of the water supply module. Optionally, the water purification micro pump 9 is electrically connected to the control system. Under the control of the control system, the water purification micro pump 9 can adjust the water supply flow of the water supply module.

[0060] The heating module 1 is arranged downstream of the water supply module, and the water supply module can be directly connected to the heating module 1, or indirectly connected to the heating module 1 through a heat exchange module. The heating module 1 can be a heating tube or a heating wire, and the water stored in the heating module 1 can be heated and kept warm by self-heating.

[0061] In the present embodiment, the heating module 1 adopts a power-adjustable heating element, which may be a PTC (Positive Temperature Coefficient) heating element, a rare earth thick film heating element or a metal heating tube, etc. The heating element heats up the room-temperature water in contact with the heating element and boils to form boiled water. The heating power of the heating element is controlled and adjusted by the control unit according to the detected parameters. The heat exchange system can change the water temperature input into the heat exchange module by adjusting the power of the heating element or the flow rate of the water purification micro pump 9, thereby realizing a continuous supply of cooked water. The heating module 1 of the present embodiment is an instant heating element, which has the functions of rapid and stable heating and adjustable power. After room-temperature water with different parameters enters the heating element, the control unit starts the heating element according to the data parameters and adjusts the power of the heating element accordingly, thereby heating the room-temperature water to the boiling point to become boiled water.

[0062] The heating module 1 has a water passage chamber inside, and the heating module 1 has a heating module water inlet 101 and a heating module water outlet 102. The heating module water inlet 101 and the heating module water outlet 102 are both connected to the water passage chamber. Normal temperature water or preheated warm raw water enters the water passage chamber from the heating module water inlet 101. The heating module 1 generates heat to heat the normal temperature water or preheated warm raw water in the water passage chamber, and the boiling water formed after heating flows out from the heating module water outlet 102.

[0063] The heating module 1 is also provided with a temperature sensing package 8 , which is used to detect the internal temperature of the heating module 1 .

[0064] The heat exchange module is connected to the water supply module and the heating module 1. The functions of the heat exchange module mainly include two aspects. One is heat exchange, and the other is storage. Specifically, the heat exchange module can use boiling water to preheat normal temperature water and store the preheated warm raw water, and at the same time cool the boiling water into warm boiled water and store the warm boiled water.

[0065] The temperature detection element is used to detect the temperature of the water stored in the heat exchange module. The temperature detection element can adopt a temperature sensor. The temperature detection element can be arranged in the heat exchange module to detect the temperature of the water stored in the heat exchange module.

[0066] The heat preservation component 2 is arranged on the heat exchange module, and is used to keep the water in the heat exchange module warm. The heat preservation component 2 can be a heating wire or a heating tube, and the heat preservation component 2 can heat and keep the heat exchange module warm by self-heating after being started.

[0067] The signal input end of the control unit is electrically connected to the temperature detection element, and the signal output end of the control unit is electrically connected to the water supply module and the heating module 1. The control unit is used to control the operation of the entire heat exchange system. The control unit can control the water supply flow of the water supply module and the operating power of the heating module 1 according to the temperature of the water stored in the heat exchange module to achieve the corresponding functions.

[0068] Of course, in other embodiments, the heat exchange module may also be provided with a liquid level sensor and other temperature sensors, and these sensors are all electrically connected to the control unit, for example, a liquid level sensor is provided in the water tank of the water supply module, a temperature sensor is provided at the main water outlet 5, etc., and the control unit controls the operation of the heat exchange system according to the parameters detected by each sensor. That is, the control unit senses the operating parameters and environmental parameters of different modules according to a variety of sensors, and at the same time selects to run different control logics according to user needs, starts to control the start and stop of the corresponding conveying equipment, etc., and adjusts the operating parameters of different modules so that the output water meets the needs of the user.

[0069] In addition, the control unit has a built-in control program for controlling the operation of the entire machine. The control unit can control the output power or start-up time of the water purification micro pump 9, the start and stop or output power of the water purification micro pump, the output power of the heating module 1, etc., thereby realizing functions such as large-flow boiling water and cooked water supply.

[0070] Furthermore, the heat exchange module includes a first pipeline 3 and a second pipeline 4, the first pipeline 3 includes a first pipeline water inlet 301 and a first pipeline water outlet 302, the second pipeline 4 includes a second pipeline water inlet 401 and a second pipeline water outlet 402, the heating module 1 includes a heating module water inlet 101 and a heating module water outlet 102, the first pipeline water inlet 301 is connected to the water supply module, the first pipeline water outlet 302 is connected to the heating module water inlet 101, the heating module water outlet 102 is connected to the second pipeline water inlet 401, and the second pipeline water outlet 402 is connected to the total water outlet 5.

[0071] It is understandable that in order to prevent water from leaking from the pipe interfaces, the above connections are all sealed connections.

[0072] The heat exchange module of this embodiment is a sleeve-type heat exchange module, and the first pipeline 3 and the second pipeline 4 are mutually sleeved, which can significantly save the overall setting space of the heat exchange system, make the structure compact, and facilitate sufficient heat exchange and reduce heat loss. In addition, the axial length of the first pipeline 3 and the second pipeline 4 should be selected and set according to design requirements. Preferably, the length of the first pipeline 3 and the second pipeline 4 is the same. The longer the axial length of the first pipeline 3 and the second pipeline 4, the longer the heat exchange path between the normal temperature water in the first pipeline 3 and the boiling water in the second pipeline 4, which is conducive to sufficient heat exchange between the two.

[0073] In this embodiment, the axial direction of the first pipeline 3 is arranged parallel to the axial direction of the second pipeline 4 .

[0074] In this embodiment, the first pipeline 3 is a normal temperature water preheating pipe, and the first pipeline 3 includes a first pipeline water inlet 301 and a first pipeline water outlet 302. The first pipeline water inlet 301 is a normal temperature water inlet, and the normal temperature water from the water supply module enters the first pipeline 3 from the first pipeline water inlet 301.

[0075] The second pipeline 4 is a boiling water cooling pipe, and the second pipeline 4 has a second pipeline water inlet 401 and a second pipeline water outlet 402. The boiling water heated by the heating module 1 flows from the heating module water outlet 102 to the second pipeline water inlet 401, and then flows into the second pipeline 4. The second pipeline water outlet 402 is directly or indirectly connected to the total water outlet 5 to realize water output.

[0076] Furthermore, the first pipeline 3 is sleeved on the outside of the second pipeline 4 , and a water flow space is formed between the inner wall of the first pipeline 3 and the outer wall of the second pipeline 4 .

[0077] Since the first pipeline 3 is sleeved on the outside of the second pipeline 4, the normal temperature water in the first pipeline 3 and the boiled water in the second pipeline 4 are heat exchanged through the pipe wall of the second pipeline 4, gradually heating up the normal temperature water in the first pipeline 3 and preheating the boiled water in the second pipeline 4. The preheated warm raw water in the first pipeline 3 enters the water passage cavity of the heating module 1 through the first pipeline water outlet 302 and the heating module water inlet 101 in sequence, so that the heating module 1 heats the preheated warm raw water, and the boiled water in the second pipeline 4 is cooled down and output through the second pipeline water outlet 402.

[0078] Of course, the tube wall of the second pipeline 4 should be made of a material that can transfer heat. In this embodiment, the second pipeline 4 is formed by a metal tube, that is, the tube wall of the second pipeline 4 is made of metal, and the internal space of the metal tube is the second pipeline 4 to ensure heat exchange efficiency.

[0079] In this embodiment, the first pipeline 3 and the second pipeline 4 are coaxially arranged so that the water flow space between the inner wall of the first pipeline 3 and the outer wall of the second pipeline 4 is uniform.

[0080] In this embodiment, the inner diameter of the first pipeline 3 is larger than the outer diameter of the second pipeline 4, the first pipeline 3 is sleeved outside the second pipeline 4, and there is a water-passing space between the inner wall of the first pipeline 3 and the outer wall of the second pipeline 4, and the water-passing space is for the normal temperature water in the first pipeline 3 to pass through. Of course, the size of the water-passing space (or the radial size of the first pipeline 3 and the second pipeline 4) can be selected and set according to needs, and this embodiment does not limit this.

[0081] In other embodiments, according to usage or design requirements, the second pipeline 4 can also be installed on the outside of the first pipeline 3, and a water flow space can be provided between the inner wall of the second pipeline 4 and the outer wall of the first pipeline 3. At this time, the wall of the first pipeline 3 should be made of a material that can transfer heat, and heat exchange between boiling water in the first pipeline 3 and normal temperature water in the second pipeline 4 can also be achieved.

[0082] Furthermore, the heat exchange system also includes a regulating member 6 , a water inlet of the regulating member is connected to the water outlet 102 of the heating module and / or the water outlet 402 of the second pipeline, and a water outlet of the regulating member is connected to the main water outlet 5 .

[0083] The adjusting member 6 is used to mix and adjust the ratio of boiled water and warm boiled water to prepare warm boiled water of different temperatures for users to use. The adjusting member 6 includes an adjusting member water inlet and an adjusting member water outlet. The adjusting member water inlet is connected to the heating module water outlet 102 and / or the second pipeline water outlet 402. The boiled water heated by the heating module 1 can enter the adjusting member 6 through the heating module water outlet 102 and the adjusting member water inlet in sequence. The warm boiled water cooled in the second pipeline 4 can enter the adjusting member 6 through the second pipeline water outlet 402 and the adjusting member water inlet in sequence.

[0084] The regulating member 6 can switch the water circuit to realize different water intake functions. The regulating member water inlet of the regulating member 6 can be connected only to the heating module water outlet 102, so that the boiled water heated by the heating module 1 enters the regulating member 6, or the regulating member water inlet can be connected only to the second pipeline water outlet 402, so that the warm boiled water cooled in the second pipeline 4 enters the regulating member 6, or the regulating member water inlet is connected to both the heating module water outlet 102 and the second pipeline water outlet 402, so that the boiled water heated by the heating module 1 and the warm boiled water cooled in the second pipeline 4 can enter the regulating member 6. The regulating member water outlet is connected to the main water outlet 5 to realize the output of boiled water or warm boiled water in each temperature range.

[0085] Specifically, the regulating member 6 adopts a stepless regulating valve. A water outlet faucet can be installed at the main water outlet 5, and boiled water or warm water of each temperature section can be output through the water outlet faucet for users to take.

[0086] The control unit controls the operating parameters of the heat exchange module (such as flow rate, contact time, etc.), the heating element power and the opening and closing degree of the adjustment member 6 by detecting the corresponding normal temperature water (purified water) parameters (such as water temperature, flow rate, etc.) and multi-temperature purified water parameters (temperature, volume, etc.), so as to achieve water output in different temperature ranges and different flow rates.

[0087] Furthermore, the heat exchange system also includes a water circuit switching control component 7, the water inlet of the water circuit switching control component is connected to the water outlet of the water supply module, and the water outlet of the water circuit switching control component is connected to the first pipeline water inlet 301 or the heating module water inlet 101.

[0088] The heat exchange system also includes a water circuit switching control component 7, which is used to switch the water circuit so that the normal temperature water of the water supply module flows to the heat exchange module or directly flows to the heating module 1. The water circuit switching control component 7 includes a water circuit switching control component water inlet and a water circuit switching control component water outlet, the water circuit switching control component water inlet is connected to the water supply module water outlet, and the water circuit switching control component water outlet can be connected to the first pipeline water inlet 301 or to the heating module water inlet 101. When the water outlet of the water circuit switching control component is connected to the water inlet 301 of the first pipeline, the normal temperature water of the water supply module enters the water circuit switching control component 7 from the water inlet of the water circuit switching control component, and then passes through the water outlet of the water circuit switching control component and the water inlet 301 of the first pipeline to enter the first pipeline 3 in sequence; when the water outlet of the water circuit switching control component is connected to the water inlet 101 of the heating module, the normal temperature water of the water supply module enters the water circuit switching control component 7 from the water inlet of the water circuit switching control component, and then passes through the water outlet of the water circuit switching control component and the water inlet 101 of the heating module to enter the heating module 1 in sequence.

[0089] The water circuit switching control element 7 is electrically connected to the control unit, and the control unit controls the operation of the water circuit switching control element 7. In this embodiment, the water circuit switching control element 7 adopts a dual-channel battery valve. This dual-channel solenoid valve has low cost, small size, short response time, and is suitable for use in water purification equipment.

[0090] Furthermore, the heat-insulating component 2 is arranged in the first pipeline 3 .

[0091] In this embodiment, the first pipeline 3 is sleeved on the outside of the second pipeline 4. Compared with the second pipeline 4, the water in the first pipeline 3 is more likely to cool down due to heat loss. Therefore, the insulation component 2 is arranged in the first pipeline 3, so that the water in the first pipeline 3 is closer to the insulation component 2. The heat generated by the insulation component 2 can directly act on the first pipeline 3, which is conducive to quickly raising the temperature of the water in the first pipeline 3, keeping the water in the first pipeline 3 warm, and improving the heating and insulation efficiency. The second pipeline 4 is arranged inside the first pipeline 3. When the first pipeline 3 can effectively keep warm, it is also conducive to the insulation effect of the second pipeline 4, so that the heat exchange module can reliably keep the internal water warm.

[0092] This embodiment also provides a water purification device, including a device body and a heat exchange system as described above, wherein the heat exchange system is disposed in the device body.

[0093] Water purification equipment is a kind of water treatment equipment that deeply filters and purifies raw water according to the water usage requirements. The water purification equipment includes the equipment body, which is the bearing structure of the water purification equipment. The equipment body has a certain structural strength, and its internal and external parts can bear other structures and components of the water purification equipment.

[0094] The heat exchange system is arranged in the body of the device. The heat exchange module of the heat exchange system can use boiled water to preheat the room temperature water and store the preheated warm raw water, and cool the boiled water into warm boiled water and store the warm boiled water at the same time. The heat insulation part 2 can insulate the water in the heat exchange module, so that the water stored in the heat exchange module is water with a certain temperature, thereby improving the heating efficiency of the heating module. When providing boiled water to the user, the water purification device provides a large flow of boiled water within a period of time, which can greatly shorten the waiting time for the user to get boiled water and improve the user experience. Moreover, the heat exchange module can store warm boiled water, and can use warm boiled water and boiled water to mix to provide users with warm boiled water of different temperatures, which is in line with the drinking water habits of Chinese people. In the initial stage of the user's water collection, since the heat exchange module stores warm boiled water, the user does not need to take out too much cold water (room temperature water), realizing the "zero cold water" function, so that the user's experience is better.

[0095] Of course, the water purification device of this embodiment also includes other structures and components that existing water purification devices have, which will not be described in detail here.

[0096] In this embodiment, the water purification equipment is a water purifier.

[0097] The heat exchange system of the water purifier in this embodiment is a new heat storage heat exchange system that integrates hot water storage and heat exchange functions. The working principle of this new heat exchange module is based on a sleeve heat exchange structure. The cold and hot fluids are respectively passed through the outer tube (first pipeline 3) and the inner tube (second pipeline 4), thereby realizing non-contact heat exchange between the two fluids, thereby changing the water temperature of the inner and outer tubes. The first pipeline 3 has its own insulation 2, which can increase and insulate the water temperature in the heat exchange module through self-heating when hot water is not taken.

[0098] The water purifier of this embodiment has multiple functions such as large-flow boiling water, large-flow cooked water, multi-temperature-stage cooked water, and zero cold water, which can significantly improve the user experience.

[0099] like Figure 5 As shown, this embodiment also provides a control method for controlling the above heat exchange system or for controlling the above water purification equipment, and the control method includes:

[0100] When water is not taken, if there is no water in the heating module 1 and the heat exchange module, the water supply module supplies normal temperature water to the heating module 1 and the heat exchange module, and the insulation component 2 is started to heat the normal temperature water in the heat exchange module to temperature T1; if there is water in the heating module 1 and the heat exchange module, when the water temperature in the heat exchange module is less than or equal to T1, the insulation component 2 is started to heat the water in the heat exchange module to temperature T1.

[0101] When taking boiling water, when the water temperature in the heat exchange module is greater than T2, it operates in a large-flow boiling water mode, and the water supply module supplies normal temperature water to the first pipeline 3 at a flow rate L1. The normal temperature water is preheated by the water in the second pipeline 4 and then heated to T3 to become preheated warm raw water. The heating module 1 is started with power P1 to heat the preheated warm raw water into boiling water, and the boiling water flows out from the main water outlet 5.

[0102] When taking boiling water, when the water temperature in the heat exchange module is less than or equal to T2, it operates in continuous boiling water mode, and the water supply module supplies normal temperature water to the heating module 1 at a flow rate L2. The heating module 1 starts with power P2 to heat the normal temperature water into boiling water, and the boiling water flows out from the main water outlet 5.

[0103] When taking warm boiled water, the water supply module supplies normal temperature water to the first pipeline 3 at a flow rate L3, the heating module 1 heats the normal temperature water into boiling water, part of the boiled water enters the second pipeline 4 and is cooled to T4 to become warm boiled water, and then transported to the regulating member 6, and the other part of the boiled water is directly transported to the regulating member 6, the regulating member 6 mixes the boiling water and the warm boiled water into warm boiled water of the required temperature, and the warm boiled water flows out from the main water outlet 5.

[0104] The control logic of the control method of this embodiment to achieve large-flow boiling water and continuous supply is: when no water is taken, the insulation part 2 is heated and the water is stored; when taking boiling water, the water supply flow of the water supply module and the heating power of the heating module 1 are controlled through a specific algorithm in combination with the stored water temperature, the temperature of the heating module 1, etc., to achieve continuous taking of large-flow boiling water of more than 1.0L / min, and solve the problem of small boiling water flow.

[0105] The control logic of the control method of this embodiment to achieve large-flow cooked water and continuous supply is: realize secondary utilization of heat through heat exchange, combine the terminal water intake temperature, cooling liquid temperature (preheated warm water temperature), and the inlet water temperature of the heating module 1, and control the water supply flow of the water supply module and the heating power of the heating module 1 through a specific algorithm to achieve large-flow cooked water supply.

[0106] The control logic of the control method of this embodiment to achieve zero cold water is: combining the water temperature stored in the heat exchange module, the temperature of the heating module 1, and the cooling liquid temperature (the temperature of the warm raw water after preheating), and controlling the water supply flow of the water supply module and the heating power of the heating module 1 and other parameters through a specific algorithm, so that the water intake temperature can reach the set value under any working condition, solving the cold water problem of the first cup of water intake caused by residual water in the system.

[0107] The control logic of the control method of this embodiment to achieve multi-temperature-stage cooked water and continuous supply is: combining the terminal water intake temperature, the cooling liquid temperature (the temperature of the warm raw water after preheating), and controlling the water supply flow of the water supply module, the heating power of the heating module 1, the rotation angle of the adjustment part 6 and other parameters through a specific algorithm to achieve the demand for multi-temperature-stage cooked water supply.

[0108] The control method of this embodiment is described in detail below:

[0109] (I) Keep warm mode

[0110] When the user does not take water, if the heat exchange system is used for the first time or the water inside the heat exchange system has been drained, and there is no water in the heating module 1 and the heat exchange module, the water supply module is first controlled to supply normal temperature water to the heat exchange module and the heating module 1, so that the heat exchange module and the heating module 1 are filled with normal temperature water. Then, the insulation component 2 is started to heat the normal temperature water in the heat exchange module to the set temperature T1. In this embodiment, T1 is 70°C. After the normal temperature water in the heat exchange module reaches temperature T1, the insulation component 2 is closed. Afterwards, the temperature sensor detects the water temperature in the heat exchange module. If the water temperature in the heat exchange module is less than or equal to T1, the insulation component 2 is started again to heat the water in the heat exchange module to temperature T1. This cycle is repeated to achieve the insulation process.

[0111] When the user does not take water, if there is water in the heating module 1 and the heat exchange module, similar to the above process, the water temperature in the heat exchange module is detected by the temperature sensor. If the water temperature in the heat exchange module is less than or equal to T1, the insulation component 2 is started to heat the water in the heat exchange module to temperature T1, and then the insulation component 2 is turned off, and the cycle is repeated to achieve the insulation process.

[0112] (ii) Boiling water mode

[0113] When the user needs to get water, he can select the required water extraction mode by operating the function buttons on the water purification device. The water extraction modes include: boiling water, warm water (cooked water), boiled water (cooked water), etc., and in the warm water extraction mode, the required warm water temperature can also be selected.

[0114] (1) High flow boiling water mode

[0115] like Figure 2As shown, when the user takes boiled water, when the water temperature in the heat exchange module is greater than T2, it operates in a large-flow boiled water mode. In this embodiment, T2 is 70°C, and the control unit controls the water circuit switching control component 7 and the regulating component 6 to switch to the large-flow boiled water branch, and controls the water purification micro pump 9 of the water supply module to supply normal-temperature water to the first pipeline 3 at a flow rate L1. In this embodiment, the flow rate L1 is 1L / min, and the normal-temperature water transported by the water supply module enters the first pipeline 3 from the first pipeline water inlet 301. Since the water temperature in the heat exchange module is greater than T2, the water in the second pipeline 4 will pass through the second The pipe wall of pipeline 4 exchanges heat with normal temperature water, so that the normal temperature water is heated to T3 to become preheated warm raw water. Generally, T3 is greater than or equal to 70°C, and the water in the second pipeline 4 will cool down. Then the preheated warm raw water flows out from the first pipe water outlet 302 and enters the heating module 1 from the heating module water inlet 101. The control unit controls the heating module 1 to start with power P1. In this embodiment, the power P1 is 2100W, so that the preheated warm raw water is instantly heated and boiled into boiling water. The boiling water flows out from the heating module water outlet 102 to the regulating member 6, and flows out from the total water outlet 5 through the regulating member 6.

[0116] During this process, users can get boiling water at 1L / min within a period of time. Compared with the existing instant boiling water mode (flow rate of 400ml / min), the time for users to get boiling water is shortened by more than half, and the waiting time is greatly shortened. The boiled water in the user's cup will hardly cool down during this process, and the user experience is good.

[0117] (2) Continuous boiling water mode

[0118] like Figure 3 As shown, when the user takes boiled water, when the water temperature in the heat exchange module is less than or equal to T2, it operates in a continuous boiled water mode. In this embodiment, T2 is 70°C. The control unit controls the water circuit switching control component 7 and the regulating component 6 to switch to the continuous boiled water branch, and controls the water purification micro pump 9 of the water supply module to supply normal temperature water to the heating module 1 at a flow rate L2. In this embodiment, the flow rate L2 is 400ml / min. The normal temperature water delivered by the water supply module directly enters the heating module 1 from the water inlet 101 of the heating module. The control unit controls the heating module 1 to start with power P1. In this embodiment, the power P1 is 2100W, so that the normal temperature water is instantly heated and boiled into boiled water. The boiled water flows out from the water outlet 102 of the heating module to the regulating component 6, and flows out from the total water outlet 5 through the regulating component 6.

[0119] When the user needs more boiled water, after the user has been taking boiled water at a large flow rate for a period of time, when the water temperature in the heat exchange module is less than or equal to T2, the heat exchange system automatically switches to continuous boiled water mode to meet the user's continuous boiled water needs.

[0120] (III) Cooked water mode (including multi-temperature cooked water and boiled water)

[0121] When the user takes cooked water, he can select the required temperature of the cooked water (45°C to 100°C), and the control unit controls the operation of the heat exchange system according to the temperature selected by the user.

[0122] (1) High flow rate water mode

[0123] like Figure 4 As shown, when the user takes cooked water, when the water temperature in the heat exchange module is greater than T2, it operates in a large-flow cooked water mode. In this embodiment, T2 is 70°C. The control unit controls the water circuit switching control component 7 and the regulating component 6 to switch to the cooked water branch, and controls the water purification micro pump 9 of the water supply module to supply normal temperature water to the first pipeline 3 at a flow rate L3. In this embodiment, the flow rate L3 is 1 to 1.1 L / min or more. The normal temperature water transported by the water supply module enters the first pipeline 3 from the first pipeline water inlet 301. Since there is water stored in the heat exchange module, the water stored in the second pipeline 4 will exchange heat with the normal temperature water through the wall of the second pipeline 4, so that the normal temperature water is heated to become preheated warm raw water, and the water stored in the second pipeline 4 will cool down, and then the preheated warm raw water will flow out from the first pipeline water outlet 302 and enter the heating module 1 from the heating module water inlet 101. The control unit controls the heating module 1 to start with power P1. In this embodiment, power P1 The power supply of the preheated warm raw water is 2100W, so that the preheated warm raw water can be immediately heated to boil into boiling water. A part of the boiling water enters the second pipeline 4 from the water inlet 401 of the second pipeline. This part of the boiling water will be cooled by heat exchange with the normal temperature water in the first pipeline 3 to become warm boiled water (such as cooling to 45°C). The warm boiled water is transported to the regulating member 6 from the water outlet 402 of the second pipeline, and another part of the boiling water is directly transported to the regulating member 6. The regulating member 6 mixes the boiling water (100°C) and the warm boiled water (45°C) into warm cooked water of the required temperature, and the warm cooked water flows out from the main water outlet 5.

[0124] During this process, users can obtain a large amount of cooked water at a flow rate of 1 to 1.1 L / min or more within a period of time, which greatly shortens the time it takes for users to obtain cooked water and provides a good user experience.

[0125] (2) Continuous boiled water mode

[0126] like Figure 4As shown, when the user takes cooked water, when the water temperature in the heat exchange module is less than or equal to T2, it operates in the continuous cooked water mode. In this embodiment, T2 is 70°C. The control unit controls the water circuit switching control component 7 and the regulating component 6 to switch to the cooked water branch, and controls the water purification micro pump 9 of the water supply module to supply normal temperature water to the first pipeline 3 at a flow rate L3. In this embodiment, the flow rate L3 is 0.3-1.2L / min. For example: when the required cooked water temperature is 85°C, the water flow rate is 0.5L / min, and when the required cooked water temperature is 45°C, the water flow rate is 1.2L / min. The normal temperature water delivered by the water supply module enters the first pipeline 3 from the first pipeline water inlet 301. Since there is water in the heat exchange module, the water in the second pipeline 4 will exchange heat with the normal temperature water through the pipe wall of the second pipeline 4, so that the normal temperature water is heated to become preheated warm raw water, and the water in the second pipeline 4 will cool down, and then the preheated warm raw water flows out from the first pipeline water outlet 302 and enters the heating module 1 from the heating module water inlet 101. The control unit controls the heating module 1 to start with power P1. In this embodiment, power P1 The power supply of the preheated warm raw water is 2100W, so that the preheated warm raw water can be immediately heated to boil into boiling water. A part of the boiling water enters the second pipeline 4 from the water inlet 401 of the second pipeline. This part of the boiling water will be cooled by heat exchange with the normal temperature water in the first pipeline 3 to become warm boiled water (such as cooling to 45°C). The warm boiled water is transported to the regulating member 6 from the water outlet 402 of the second pipeline, and another part of the boiling water is directly transported to the regulating member 6. The regulating member 6 mixes the boiling water (100°C) and the warm boiled water (45°C) into warm cooked water of the required temperature, and the warm cooked water flows out from the main water outlet 5.

[0127] When the user requires a large amount of cooked water, after the user has been taking cooked water at a large flow rate for a period of time, when the water temperature in the heat exchange module is less than or equal to T2, the heat exchange system automatically switches to the continuous cooked water mode to meet the user's continuous demand for cooked water.

[0128] In addition, under various operating conditions of the heat exchange system of this embodiment, since water of a certain temperature is stored in the heat exchange module, when the user starts to use water, the cooked water with temperature in the heat exchange module will be first transported to the main water outlet 5, which can solve the problem of the first cup of water being cold water due to residual water in the system, and realize the no cold water function (no perception of cold water).

[0129] The heat exchange system of this embodiment can realize the multi-temperature section and large flow rate boiled water function. The experimental data are as follows:

[0130] In "Large Flow Cooked Water Mode":

[0131] Boiled water temperature (℃) Boiled water flow (ml / min) 90 ≥1000 85 ≥1000 80 ≥1000 77 ≥1000 70 ≥1000 61 ≥1000 58 ≥1000 54 ≥1100 47 ≥1100 45 ≥1100

[0132] It can be seen that in the large-flow cooked water mode, the heat exchange system of this embodiment can achieve a water supply with a flow rate of 1 to 1.1 L / min or more, meeting the user's needs for continuous use of a large amount of cooked water.

[0133] In "Continuous Boiled Water Mode":

[0134] Boiled water temperature (℃) Boiled water flow (ml / min) 90 540 85 570 80 630 77 678 70 734 61 887 58 958 54 1100 47 1100 45 1100

[0135] It can be seen that in the continuous cooked water mode, the heat exchange system of this embodiment can achieve a water supply with a flow rate of 0.5 to 1.1 L / min, meeting the user's demand for continuous use of cooked water.

[0136] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A heat exchange system, characterized in that: include: Water supply module; A heating module (1) is connected to the water supply module, and the heating module (1) is used to heat room temperature water or preheated warm raw water into boiling water; A heat exchange module is connected to the water supply module and the heating module (1), wherein the heat exchange module uses boiled water to preheat the normal temperature water and stores the preheated warm raw water, and at the same time cools the boiled water into warm boiled water and stores the warm boiled water; A temperature detection element, used to detect the temperature of water stored in the heat exchange module; A heat-insulating element (2), arranged in the heat exchange module, for keeping water in the heat exchange module warm; A control unit, wherein a signal input end thereof is electrically connected to the temperature detection element, and a signal output end thereof is electrically connected to the water supply module and the heating module (1).

2. The heat exchange system according to claim 1, characterized in that: The heat exchange module comprises a first pipeline (3) and a second pipeline (4) which are sleeved together; the first pipeline (3) comprises a first pipeline water inlet (301) and a first pipeline water outlet (302); the second pipeline (4) comprises a second pipeline water inlet (401) and a second pipeline water outlet (402); the heating module (1) comprises a heating module water inlet (101) and a heating module water outlet (102); the first pipeline water inlet (301) is connected to the water supply module; the first pipeline water outlet (302) is connected to the heating module water inlet (101); the heating module water outlet (102) is connected to the second pipeline water inlet (401); and the second pipeline water outlet (402) is connected to the main water outlet (5).

3. The heat exchange system according to claim 2, characterized in that: The first pipeline (3) is sleeved on the outside of the second pipeline (4), and a water flow space is formed between the inner wall of the first pipeline (3) and the outer wall of the second pipeline (4).

4. The heat exchange system according to claim 2, characterized in that: It also includes a regulating member (6), the water inlet of the regulating member is connected to the water outlet (102) of the heating module and / or the water outlet (402) of the second pipeline, and the water outlet of the regulating member is connected to the total water outlet (5).

5. The heat exchange system according to claim 2, characterized in that: It also includes a water circuit switching control component (7), the water circuit switching control component water inlet is connected to the water supply module water outlet, and the water circuit switching control component water outlet is connected to the first pipeline water inlet (301) or the heating module water inlet (101).

6. The heat exchange system according to claim 5, characterized in that: The water channel switching control component (7) is a dual-channel solenoid valve.

7. The heat exchange system according to any one of claims 2 to 6, characterized in that: The heat-insulating component (2) is arranged on the first pipeline (3).

8. A water purification device, characterized in that: It comprises a device body and a heat exchange system as described in any one of claims 1 to 7, wherein the heat exchange system is arranged in the device body.

9. The water purification device according to claim 8, characterized in that: The water purification equipment is a water purifier.

10. A control method for controlling the heat exchange system according to any one of claims 3 to 7, or for controlling the water purification equipment according to claim 8 or 9, characterized in that: The control method comprises: When water is not taken out, if there is no water in the heating module (1) and the heat exchange module, the water supply module supplies normal temperature water to the heating module (1) and the heat exchange module, and the heat preservation component (2) is started to heat the normal temperature water in the heat exchange module to the temperature T1; if there is water in the heating module (1) and the heat exchange module, when the temperature of the water in the heat exchange module is less than or equal to T1, the heat preservation component (2) is started to heat the water in the heat exchange module to the temperature T1; When taking boiled water, when the water temperature in the heat exchange module is greater than T2, the heat exchange module operates in a large-flow boiled water mode, the water supply module supplies normal-temperature water to the first pipeline (3) at a flow rate of L1, the normal-temperature water is preheated by the water in the second pipeline (4) and then heated to T3 to become preheated warm raw water, the heating module (1) is started at a power of P1 to heat the preheated warm raw water into boiled water, and the boiled water flows out from the main water outlet (5); When taking boiled water, when the water temperature in the heat exchange module is less than or equal to T2, the heat exchange module operates in a continuous boiled water mode, the water supply module supplies normal temperature water to the heating module (1) at a flow rate of L2, the heating module (1) starts at a power of P2 to heat the normal temperature water into boiled water, and the boiled water flows out from the main water outlet (5); When taking warm boiled water, the water supply module supplies normal temperature water to the first pipeline (3) at a flow rate of L3, the heating module (1) heats the normal temperature water into boiling water, a portion of the boiled water enters the second pipeline (4) and is cooled to T4 to become warm boiled water, which is then transported to the regulating element (6), and another portion of the boiled water is directly transported to the regulating element (6), the regulating element (6) mixes the boiled water and the warm boiled water into warm boiled water of the required temperature, and the warm boiled water flows out from the main water outlet (5).

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