Water heating system and hot water machine

Abstract

The application relates to a heating system and a hot water machine. The heat exchange device comprises a first water path and a second water path, and the first water path and the second water path exchange heat in opposite water flow directions. The water outlet of the first heating device and the water inlet of the second heating device are connected to the same water path, the water outlet and the water outlet of the second heating device are respectively connected to another water path, and a first temperature detector is arranged at the water outlet of the second heating device. The boiling water input into one water path can heat the water originally stored in the other water path, and the water is output through the water outlet, so that zero cold water operation is realized. Or the boiling water is cooled by the first heat exchange water transmitted by one water path during the transmission process in the other water path, and the hot water consistent with the user demand is obtained. Therefore, zero cold water instant fresh hot water preparation and multi-temperature-section instant fresh hot water preparation are realized, and the whole machine has strong operation performance.

Description

Technical Field

[0001] This application relates to the field of drinking water treatment technology, and in particular to a water heating system and a hot water dispenser. Background Technology

[0002] Against the backdrop of the big health industry, water purification equipment is constantly expanding the boundaries of product value based on water quality safety requirements. Its functional indicators are gradually moving from safety to health and comfort. In addition to pure water products, boiled water may become the next selling point of water purification, and boiled water machines have emerged.

[0003] However, water purifiers generally use instant heating elements for heating. During the boiling water heating process, there is too much cold water. The boiled water must be boiled first and then the temperature is controlled. The low-temperature water from the boiling water setting will be transferred to the boiled water setting in place, causing the water temperature at each setting to be lower than the set value, resulting in poor overall machine performance. Summary of the Invention

[0004] Therefore, it is necessary to provide a water heating system and a hot water dispenser to solve the problem of poor overall performance of the hot water dispenser.

[0005] A water heating system includes: a water inlet, a heat exchange device, a first heating device, a second heating device, and a control device. The heat exchange device includes a first water path and a second water path, which exchange heat in opposite directions. The inlet of the first heating device is used to input water to be heated. The outlet of the first heating device is connected to the inlet of the second heating device through the first water path, and the outlet of the second heating device is connected to the water inlet through the second water path; alternatively, the outlet of the first heating device is connected to the inlet of the second heating device through the second water path, and the outlet of the second heating device is connected to the water inlet through the first water path. The control device is connected to both the first heating device and the second heating device.

[0006] In one embodiment, the first water path is a heat exchange outer pipe, and the second water path is a heat exchange inner pipe, wherein the heat exchange inner pipe is sleeved within the water storage space of the heat exchange outer pipe.

[0007] In one embodiment, both the outer heat exchange tube and the inner heat exchange tube are bent tubes.

[0008] And / or, in one embodiment, the inner wall of the heat exchange inner tube is corrugated with a turbulent shape.

[0009] In one embodiment, the water heating system further includes a water input device, the water inlet of the first heating device being connected to the water input device.

[0010] In one embodiment, the water input device includes a water tank and a water pump, the water tank being connected to the water pump, and the water pump being connected to the inlet of the first heating device.

[0011] In one embodiment, the water input device further includes a purification device, and the water tank is connected to the water pump through the purification device.

[0012] In one embodiment, the water input device includes a water tank and a purified water pump, the water tank being connected to the purified water pump, and the purified water pump being connected to the water inlet of the first heating device.

[0013] In one embodiment, the water input device further includes a level detector disposed in the water tank and connected to the control device.

[0014] In one embodiment, the first heating device is an instant heating device.

[0015] In one embodiment, the second heating device is an instant heating device or a heat storage heating device.

[0016] In one embodiment, the water heating system further includes a first temperature detector, which is disposed at the outlet of the second heating device and connected to the control device.

[0017] The water heating system further includes a second temperature detector and / or a third temperature detector. The second temperature detector is located at the water inlet, and the third temperature detector is located at the water outlet of the first heating device. The second temperature detector and the third temperature detector are respectively connected to the control device.

[0018] In one embodiment, the control device is used to control the first heating device to output first heat exchange water at a set temperature corresponding to the target outlet temperature, based on the first inlet water temperature of the first heating device, the outlet water temperature of the second heating device, and the target outlet water temperature, and to control the second heating device to output boiling water, so that the water outlet outputs cooked water with the same temperature as the target outlet water.

[0019] In one embodiment, the control device is further configured to, when determining that the multi-temperature range water intake conditions are met based on the outlet water temperature, determine the inlet flow rate of the first heating device based on the target outlet water temperature and the first inlet water temperature, and control the first heating device to heat water at the inlet water flow rate to output the first heat exchange water.

[0020] In one embodiment, the control device is further configured to increase the inlet flow rate of the first heating device according to the second inlet water temperature of the second heating device.

[0021] In one embodiment, the control device is further configured to switch the output of the first heating device to a second heat exchange water with a set temperature corresponding to the changed target outlet water temperature when the target outlet water temperature changes, thereby maintaining the output of boiling water from the second heating device so that the water outlet outputs cooked water with the same temperature as the changed target outlet water temperature.

[0022] In one embodiment, the control device is further configured to switch the output of the first heating device to a second heat exchange water at a set temperature corresponding to the changed target outlet water temperature by changing at least one of the following: changing the inlet flow rate of the first heating device, changing the heating power of the first heating device, and changing the heating power of the second heating device, thereby maintaining the output of boiling water from the second heating device.

[0023] In one embodiment, the control device is further configured to control the first heating device to output boiling water based on the first inlet water temperature when it is determined that the zero cold water heating condition is met.

[0024] In one embodiment, the control device is further configured to determine the inlet flow rate of the first heating device based on the difference between the boiling point temperature and the first inlet water temperature, and to determine the boiling water heating power of the first heating device based on the inlet flow rate and the difference, and to control the first heating device to operate at the boiling water heating power to output boiling water.

[0025] In one embodiment, the control device is further configured to, when the first heating device outputs boiling water, verify whether the multi-temperature water intake condition is met according to the water intake temperature of the water outlet, and if the multi-temperature water intake condition is met, switch the control of the first heating device to output first heat exchange water at a set temperature corresponding to the target outlet water temperature, and control the second heating device to output boiling water, so that the water outlet outputs cooked water with the same temperature as the target outlet water.

[0026] A water purifier includes the aforementioned water heating system.

[0027] The aforementioned water heating system and boiled water dispenser include a heat exchange device comprising a first water path and a second water path, which exchange heat in opposite directions. The outlet of the first heating device and the inlet of the second heating device are connected to the same water path, while the outlet and intake of the second heating device are connected to another water path respectively. During actual operation, the outlet temperature of the second heating device can be acquired in real time, and if the zero-cold-water heating condition is met, the first heating device is directly controlled to heat the input water to boiling. Thus, boiling water input from one water path can heat water previously stored in the other water path connected to the intake, and output through the intake, achieving zero-cold-water operation. Alternatively, by combining the target outlet temperature, the first inlet temperature of the first heating device, and the outlet temperature of the second heating device, the first heating device is controlled to output first heat exchange water at a set temperature corresponding to the target outlet temperature to a connected water path, while the second heating device is controlled to output boiling water to another water path. Thus, during the transmission of boiling water through the other water path, it is cooled by the first heat exchange water transmitted through the water path connected to the first heating device, resulting in boiled water that meets the user's needs. When the target outlet water temperature changes, simply by controlling and changing the set temperature of the second heat exchange water output from the first heating device to the connected water circuit, the boiling water transmitted through the other water circuit can be heated to the same temperature as the changed target outlet water. Through this method, instantaneous fresh boiled water preparation with zero cold water and multi-temperature-segment instantaneous fresh boiled water preparation can be achieved, demonstrating strong overall machine performance. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the water heating system structure in one embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the water heating system structure in one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the first and second water channels in one embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the first and second water channels in another embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the water heating system structure in another embodiment of this application;

[0034] Figure 6 This is a schematic diagram of the water heating system structure in another embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the water heating system structure in another embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the water heating system structure in another embodiment of this application.

[0037] Explanation of reference numerals in the attached drawings: 101-Heat exchange device, 102-First heating device, 103-Second heating device, 104-First temperature detector, 1011-First water path, 1012-Second water path, 107-Water inlet, 111-Water input device, 1111-Water tank, 1112-Water pump, 1113-Purification device, 1114-Purified water pump, 701-Liquid level detector, 703-Second temperature detector, 704-Third temperature detector. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0039] The water heating system of this application embodiment is applied in a boiled water machine, or it can be applied in a water purifier or water dispenser with boiled water function. There is no specific limitation. For the sake of understanding the technical solution of this application, it can be understood below that the water heating system is applied in a boiled water machine.

[0040] Please see Figure 1 A water heating system includes: a heat exchange device 101, a first heating device 102, a second heating device 103, a water inlet 107, and a control device (not shown). The heat exchange device 101 includes a first water path 1011 and a second water path 1012, which exchange heat in opposite directions. The inlet of the first heating device 102 is used to input water to be heated. The outlet of the first heating device 102 and the inlet of the second heating device 103 are respectively connected to the same water path. The outlet and the water inlet 107 of the second heating device 103 are respectively connected to another water path. The control device is connected to the first heating device 102 and the second heating device 103 respectively.

[0041] Specifically, the heat exchange device 101 is a device for exchanging heat between the water output from the first heating device 102 and the water output from the second heating device 103. The first water path 1011 and the second water path 1012 are configured to exchange heat in opposite directions. In practical applications, the water output from the first heating device 102 can flow through the first water path 1011, and the water output from the second heating device 103 can flow through the second water path 1012, ultimately drawing water through the water inlet 107 connected to the second water path 1012. In other embodiments, please refer to... Figure 2 Alternatively, the water output from the first heating device 102 can flow in the second water passage 1012, and the water output from the second heating device 103 can flow in the first water passage 1011, and finally be drawn from the water inlet 107 connected to the first water passage 1011. The specific method is not limited.

[0042] The arrangement of the first water channel 1011 and the second water channel 1012 is not unique, as long as heat exchange is ensured to occur in opposite directions of water flow. For example, in one embodiment, the first water channel 1011 is attached to the outer wall of the second water channel 1012, and both the first water channel 1011 and the second water channel 1012 are designed with materials that have good heat exchange performance. In another embodiment, the first water channel 1011 can be disposed within the water storage space of the second water channel 1012, as long as the first water channel 1011 disposed inside is designed with materials that have good heat exchange performance; or the second water channel 1012 can be disposed within the water storage space of the first water channel 1011 (e.g., Figure 1 As shown in the figure, it is necessary to ensure that the second water channel 1012 set inside is designed with materials with good heat exchange performance.

[0043] To facilitate understanding of the technical solution of this application, the following will be used as an example. Figure 1 The water outlet of the first heating device 102 shown is connected to the first water channel 1011. The water output from the first heating device 102 flows in the first water channel 1011 and exchanges heat with the water output from the second heating device 103 to the second water channel 1012. This will be explained by way of example.

[0044] Based on this, the control device can realize the multi-temperature segment boiled water preparation logic. Correspondingly, in one embodiment, the control device is used to control the first heating device 102 to output the first heat exchange water at a set temperature corresponding to the target outlet temperature to the first water channel 1011 according to the first inlet water temperature, outlet water temperature and target outlet water temperature of the first heating device 102, and to control the second heating device 103 to output boiling water to the second water channel 1012, so that the water outlet 107 outputs boiled water with the same temperature as the target outlet water.

[0045] The method for obtaining the first inlet water temperature of the first heating device 102 is not unique. In one embodiment, water at a pre-set constant temperature can be input into the first heating device 102, thus ensuring a constant first inlet water temperature that can be pre-set in the control device. In another embodiment, a temperature detector can be installed at the inlet of the first heating device 102 to detect the temperature; the specific method is not limited. For ease of understanding, it can be assumed below that the first inlet water temperature is detected by a temperature detector at the inlet of the first heating device 102. The outlet water temperature is obtained by a temperature detector installed at the outlet of the second heating device 103. The target outlet water temperature is set by the user and sent to the control device.

[0046] The target outlet water temperature is the temperature of the boiled water that the user sets and expects to be output from the water inlet 107 of the water heating system. The target outlet water temperature can be sent by the user; specifically, the water heating system can be equipped with a human-machine interface (which can be a mechanical button or a touch screen). When using the water heating system, the user inputs the target outlet water temperature to the control device through the human-machine interface. In another embodiment, the control device can also wirelessly communicate with a terminal device (which can be a mobile phone, etc.), and the user inputs the target outlet water temperature to the control device through the terminal device.

[0047] The set temperature refers to the temperature value at which, under the current target outlet water temperature, the boiling water output by the first heat exchange device 102 and the boiling water output by the second heating device 103 can be cooled down to the target outlet water temperature after heat exchange. Boiling water is the water obtained by heating water to its boiling point. The temperature of boiling water will vary depending on the altitude or air pressure, and is not specifically limited. For ease of understanding of the technical solution of this application, boiling water can be understood as 100℃ in the following embodiments. After obtaining the target outlet water temperature, the first inlet water temperature, and the outlet water temperature, the control device will control the operation of the first heating device 102 and the second heating device 103 accordingly.

[0048] The method for determining the set temperature is not unique. In one embodiment, it can be determined by combining the target outlet water temperature and the first inlet water temperature. In this embodiment, the control device has a pre-stored calculation model for the set temperature. After obtaining the target outlet water temperature and the first inlet water temperature, the set temperature can be calculated by substituting them into the calculation model. This calculation model can be obtained by combining multiple sets of target outlet water temperature, first inlet water temperature, and set temperature data collected in the actual experimental environment and performing fitting analysis; the specific method is not limited.

[0049] In another embodiment, the control device may pre-store a correspondence between the target outlet water temperature and the set temperature. Once the target outlet water temperature is determined, simply substituting it into the correspondence will yield the corresponding set temperature. This correspondence can be obtained through multiple experimental analyses and stored in the control device.

[0050] In a more detailed embodiment, taking a target outlet water temperature of 55°C as an example, if the first heat exchange water output by the first heating device 102 needs to exchange heat with the boiling water output by the second heating device 103 so that the boiling water is cooled to 55°C for cooked water, the set temperature can be determined to be 35°C by matching the correspondence between the target outlet water temperature and the set temperature.

[0051] In one embodiment, the control device is further configured to switch the first heating device 102 to output second heat exchange water at a set temperature corresponding to the changed target outlet water temperature when the target outlet water temperature changes, and maintain the second heating device 103 to output boiling water so that the water outlet 107 outputs cooked water with the same temperature as the changed target outlet water temperature.

[0052] When the target outlet water temperature remains unchanged, the control device only needs to maintain the temperature of the first heat exchange water output by the first heating device 102 at the set temperature and maintain the water output by the second heating device 103 as boiling water. The two enter different water paths (the first heat exchange water can enter the first water path 1011 or the second water path 1012, and the boiling water can enter the second water path 1012 or the first water path 1011), so that after the two exchange heat, the target outlet water temperature is maintained.

[0053] When the target outlet water temperature changes, while maintaining the output of boiling water from the second heating device 103, the output water temperature of the first heating device 102 needs to be adjusted accordingly to ensure that after heat exchange between the two outputs, the boiling water can be cooled to the temperature required by the user for boiled water. Conversely, if the target outlet water temperature decreases, the output water temperature of the first heating device 102 needs to be reduced to absorb heat from the water in the second water path 1012, causing the boiling water to drop to a lower temperature; conversely, if the target outlet water temperature increases, it indicates that the user requires boiled water at a higher temperature, and in this case, the output water temperature of the first heating device 102 needs to be increased.

[0054] It should be noted that the control device switches the control of the first heating device 102 to output the second heat exchange water at a set temperature corresponding to the changed target outlet water temperature. The way to maintain the output of boiling water by the second heating device 103 is not unique. In one embodiment, it can be achieved by changing at least one of the following methods: changing the inlet flow rate of the first heating device 102, changing the heating power of the first heating device 102, and changing the heating power of the second heating device 103.

[0055] Specifically, in one embodiment, the inlet flow rate of the first heating device may be adjusted according to the water temperature at the water inlet, so that the first heating device outputs second heat exchange water at a set temperature corresponding to the changed target outlet water temperature; the heating power of the second heating device may be adjusted to maintain the output of boiling water from the second heating device.

[0056] In one embodiment, the first heating device 102 may be controlled to operate at a constant inlet water flow rate; the heating power of the first heating device 102 may be adjusted so that the first heating device 102 outputs second heat exchange water at a set temperature corresponding to the changed target outlet water temperature; and the heating power of the second heating device 103 may be adjusted so as to maintain the output of boiling water by the second heating device 103.

[0057] In one embodiment, the heating power and water flow rate of the first heating device 102 can be adjusted to maintain the heating power of the second heating device 103 unchanged, so as to control the first heating device 102 to output second heat exchange water at a set temperature corresponding to the changed target outlet water temperature, and maintain the second heating device 103 to output boiling water.

[0058] In one embodiment, the heating power of the first heating device 102 and the second heating device 103 can be kept constant, and the water inlet flow rate of the first heating device 102 can be adjusted to control the first heating device 102 to output second heat exchange water at a set temperature corresponding to the changed target outlet water temperature, while maintaining the output of boiling water from the second heating device 103.

[0059] In one embodiment, the heating power and inlet flow rate of the first heating device 102 can be adjusted so that the first heating device 102 outputs second heat exchange water to the first water circuit at a set temperature corresponding to the changed target outlet water temperature; the heating power of the second heating device 103 can be adjusted to maintain the output of boiling water by the second heating device 103.

[0060] Furthermore, in one embodiment, the control device is also configured to: determine the inlet flow rate of the first heating device 102 based on the target outlet water temperature and the first inlet water temperature when the multi-temperature range water intake conditions are met, and control the first heating device 102 to heat water at the inlet flow rate to output the first heat exchange water.

[0061] Specifically, multi-temperature-segment water intake refers to users extracting boiled water at different temperatures from the water heating system according to their actual needs. In this embodiment, before outputting boiled water, it is necessary to determine whether the conditions for multi-temperature-segment water intake are met by checking the outlet temperature of the second heating device 103. If the conditions are met, the relevant procedures for multi-temperature-segment boiled water preparation are initiated. That is, by combining the target outlet temperature, the first inlet temperature, and the inlet flow rate, the first heating device 102 is controlled to output heat exchange water corresponding to the target outlet temperature, and the second heating device 103 is controlled to output boiling water. In this way, the boiled water preparation operations are performed under the condition of multi-temperature-segment water intake, improving the operational reliability of the water heating system.

[0062] Specifically, when performing multi-temperature-segment boiled water preparation, the control device first performs calculations and analysis based on the target outlet water temperature and the first inlet water temperature to determine the required inlet water flow rate for the first heating device 102 to meet the target outlet water temperature. The inlet water flow rate is then used to control the water flow into the first heating device 102 for heating. Next, the control device matches the target outlet water temperature to obtain a set temperature and adjusts the heating power of the first heating device 102 according to an algorithm, ensuring that the first heat exchange water output by the first heating device 102 is at the set temperature. Finally, the control device adjusts the heating power of the second heating device 103 to ensure that the second heating device 103 outputs boiling water, completing the boiled water preparation corresponding to the target outlet water temperature.

[0063] The method of adjusting the inlet water flow rate is not unique. In one embodiment, the inlet of the first heating device 102 may be equipped with a flow regulating valve, and the control device may adjust the flow rate of the first heating device 102 to the inlet water flow rate through the flow regulating valve.

[0064] In another embodiment, please refer to Figure 2 Alternatively, a water input device 111 can be installed at the inlet of the first heating device 102, and the control device can adjust the output flow rate of the water input device 111 according to the inlet water flow rate. In this way, by installing a water input device 111 at the inlet of the first heating device 102, a certain amount of water can be stored through the water input device 111, and the flow rate of the water to be heated input into the first heating device 102 can also be controlled, thereby improving the operational reliability of the water heating system.

[0065] In a more detailed embodiment, the target outlet water temperature is 55℃, and the first inlet water temperature is 25℃. The multi-temperature segment water intake control logic is activated: the control device calculates and adjusts the flow rate to 0.95L / min based on the temperature difference Δt (Δt = 55℃ - 25℃ = 30℃) using an algorithm. The first heating device 102 selects its power based on a 10℃ (55℃ - 45℃ + 25℃) temperature difference calculated by the algorithm, ensuring that the outlet water temperature of the first heating device 102 is the set value of 35℃. The water enters the first water path 1011 for transmission and is heated to 80℃ by the boiling water in the second water path 1012 when it flows out of the first water path 1011. The second heating device 103 adjusts its power in real time according to the outlet water temperature, ensuring that the outlet water temperature of the second heating device 103 is maintained at 100℃ (boiling point). The boiling water is cooled to 55℃ by heat exchange water in the first water path 1011, achieving the preparation of 55℃ boiled water.

[0066] It should be noted that the method for verifying whether the multi-temperature-segment water intake conditions are met based on the outlet water temperature is not unique. In one embodiment, it can be determined whether the outlet water temperature is greater than a preset temperature threshold. The preset temperature threshold is not unique; in one embodiment, it can be set to 40°C. Correspondingly, if the control device detects that the outlet water temperature is greater than 40°C, it confirms that the multi-temperature-segment water intake conditions are met; if it detects that the outlet water temperature is less than or equal to 40°C, it is considered that the multi-temperature-segment water intake conditions are not met.

[0067] In one embodiment, the control device is further configured to: control the first heating device 102 to output boiling water based on the first inlet water temperature when it is determined that the zero cold water heating condition is met.

[0068] Specifically, if the outlet water temperature does not meet the multi-temperature range water intake conditions, meaning the outlet water temperature meets the zero-cold-water intake conditions, then to achieve zero-cold-water intake, the control device adjusts the heating power of the first heating device 102 so that the water output by the first heating device 102 is boiling water. After this, the boiling water flows into the first water path 1011 and exchanges heat with the water already present in the second water path 1012, heating the water already present in the second water path 1012 and preventing cold water from being output from the water intake 107, thus achieving the zero-cold-water function.

[0069] In one embodiment, controlling the first heating device 102 to output boiling water based on the first inlet water temperature includes: determining the inlet water flow rate of the first heating device 102 based on the difference between the boiling point temperature and the first inlet water temperature; determining the boiling water heating power of the first heating device 102 based on the inlet water flow rate and the difference; and controlling the first heating device 102 to operate at the boiling water heating power.

[0070] Specifically, the boiling point temperature is the temperature required for the water in the first heating device 102 to boil. It is understood that this boiling point temperature is not unique; it can be set differently depending on the application area of ​​the water heating system, and there is no specific limitation. For example, it can be set to 100℃.

[0071] In this embodiment, during zero-cold-water operation, the boiling point temperature and the first inlet water temperature are first obtained, and the difference between them is calculated. This difference is then analyzed to determine the required inlet water flow rate for the first heating device 102. Next, based on the inlet water flow rate and the difference, the boiling water heating power required for the first heating device 102 to heat the inlet water to the boiling point temperature is determined. Finally, the control device controls the first heating device 102 to input water at the inlet water flow rate and operates at the boiling water heating power, ensuring that boiling water is input into the first heating device 102.

[0072] For example, in a more detailed embodiment, the target outlet water temperature is 55°C, and the first inlet water temperature is 25°C. When the outlet water temperature of the second heating device 103 is detected to be less than or equal to 40°C, the zero-cold-water control logic is activated: based on the temperature difference of 75°C (boiling point temperature - first inlet water temperature), the algorithm adjusts the water input device 111 to output water at a flow rate of 0.4L / min to the first heating device 102. The first heating device 102, in conjunction with the 75°C synchronous selection of power (e.g., 2100W), ensures that the outlet water temperature of the first heating device 102 is boiling water (100°C). After the boiling water enters the first water path 1011, it exchanges heat with the water stored in the second water path 1012 in reverse, causing the water stored in the second water path 1012 to heat up to 55°C, thereby achieving zero-cold-water supply. It can be understood that during the zero-cold-water supply process, the second heating device 103 does not need to be turned on for heating, that is, the power of the second heating device 103 is set to 0W.

[0073] The specific types of the first heating device 102 and the second heating device 103 are not unique, and the types of the first heating device 102 and the second heating device 103 can be the same or different.

[0074] In one embodiment, the first heating device 102 is an instant heating device. An instant heating device is a heating device that uses an instant heating element to heat water. In this embodiment, the instant heating device rapidly heats the water to the required temperature, resulting in high heating efficiency.

[0075] Correspondingly, in one embodiment, the second heating device 103 is either an instant heating device or a heat storage heating device. A heat storage heating device is a heating device that uses a heat storage heating element to heat water. Unlike the first heating device 102 described above, the second heating device 103 generally heats the incoming water to boiling during actual operation. Therefore, the second heating device 103 can achieve this through either instant or heat storage heating, depending on the specific needs. Thus, the second heating device 102 can use any one of the following: a PTC (Positive Temperature Coefficient) heating element, a rare-earth thick-film heating element, or a metal heating tube.

[0076] It should be noted that the specific structure of the first water channel 1011 and the second water channel 1012 is not unique. In one embodiment, the second water channel 1012 may be submerged in the first water channel 1011, and the water flow directions of the two may be opposite. For details, please refer to the relevant reference. Figure 3 .

[0077] In one embodiment, please refer to [reference needed]. Figure 4 The first water passage 1011 is a heat exchange outer pipe, and the second water passage 1012 is a heat exchange inner pipe, with the inner pipe fitted over the water storage space of the outer pipe. In this embodiment, the first water passage 1011 and the second water passage 1012 are arranged in a sleeve-like configuration, meaning the first water passage 1011 is fitted over the outer wall of the second water passage 1012, with a certain gap between them. This gap serves as the water storage space for the first water passage 1011, used to transport water output from the first heating device 102. This arrangement significantly increases the heat exchange area of ​​the first water passage 1011 and the second water passage 1012, effectively improving heat exchange efficiency.

[0078] In one embodiment, both the outer heat exchange tube and the inner heat exchange tube are bent tubes.

[0079] Specifically, in this embodiment, the heat exchange outer pipe and the heat exchange inner pipe are configured as bends. After being heated by the first heating device 102, the water enters the bend from the inlet end of the heat exchange outer pipe and flows along the outer wall of the heat exchange inner pipe, exchanging heat with the water in the inner pipe before entering the second heating device 103 for further heating. This bend design effectively reduces the lateral and longitudinal dimensions of the first water passage 1011 and the second water passage 1012 while ensuring sufficient water flow, thus reducing the spatial dimensions of the heat exchange device 101 and facilitating installation.

[0080] In one embodiment, the inner wall of the heat exchange inner tube is corrugated and has a turbulent shape.

[0081] Specifically, in this embodiment, the inner wall of the heat exchange inner tube is designed with a corrugated turbulence shape to effectively enhance the heat exchange effect of the second water channel 1012. It can be understood that, in a more detailed embodiment, both the first water channel 1011 and the second water channel 1012 are metal tubes, which have good heat conduction efficiency.

[0082] Please see Figure 5 In one embodiment, the water input device 111 includes a water tank 1111 and a water pump 1112, with the water tank 1111 connected to the water pump 1112 and the water pump 1112 connected to the inlet of the first heating device 102.

[0083] Specifically, the solution in this embodiment is explained using water tank 1111 storing water as an example. At this time, the water output from water tank 1111 already meets the requirements for drinking water and does not need to be filtered. Therefore, the water output from water tank 1111 can be directly transferred to the first heating device 102 for heating through water pump 1112.

[0084] Please see Figure 6 In one embodiment, the water input device 111 further includes a purification device 1113, and the water tank 1111 is connected to the water pump 1112 through the purification device 1113.

[0085] Specifically, in this embodiment, the water stored in the water tank 1111 is not pure water and needs to be filtered before it can be supplied to the user. Therefore, a purification device 1113 is further provided between the water pump 1112 and the water tank 1111. After the pure water is purified by the purification device 1113, it is then transported by the water pump 1112 to the first heating device 102 for heating.

[0086] It is understood that the specific type of purification device 1113 is not unique. In one embodiment, purification device 1113 includes a pretreatment module and a deep treatment module, either individually or in combination. The pretreatment module performs preliminary filtration to remove pollutants such as silt, rust, and residual chlorine from the water, and can be a combination or composite of a pre-filter cartridge, an activated carbon cartridge, and a pre-filter cartridge. The pre-filter cartridge can be a PP cotton cartridge or an ultrafiltration cartridge, and the activated carbon cartridge can be granular activated carbon, carbon fiber, or carbon rod cartridge. The deep treatment module performs deep filtration to remove toxic and harmful substances such as heavy metals and microorganisms from the water, and can be one or more of ultrafiltration, nanofiltration, or reverse osmosis filtration modules in combination.

[0087] Please see Figure 7 In one embodiment, the water input device 111 includes a water tank 1111 and a water purification pump 1114, the water tank 1111 being connected to the water purification pump 1114, and the water purification pump 1114 being connected to the inlet of the first heating device 102.

[0088] Specifically, the water purification pump 1114 is the same as the water pump 1112 with water purification function. In this embodiment, the water tank 1111 can also store raw water. After the raw water enters the water purification pump 1114, it is purified to obtain pure water, which is then transferred to the first heating device 102 for heating.

[0089] Please refer to the following: Figure 8 In one embodiment, the water input device 111 further includes a level detector 701, which is disposed in the water tank 1111 and connected to a control device (not shown).

[0090] Specifically, the level detector 701 is used to detect the level of the water tank 1111 and send it to the control device. In this embodiment, before starting the multi-temperature-segment boiled water preparation or zero-cold water preparation, the control device is also used to verify whether the water heating system meets the water intake start-up conditions.

[0091] Because the boiling water preparation of the water heating system requires the first heating device 102 to continuously draw water from the water input device 111, it is necessary to verify whether the water heating system meets the water intake start-up conditions before starting multi-temperature-segment boiling water preparation or zero-cold-water preparation. If the water intake start-up conditions are met, water intake is started for boiling water preparation; otherwise, an alarm message is output to remind the user to add water or perform maintenance.

[0092] The specific type of water intake start-up condition is not unique; any condition that indicates water input to the inlet of the first heating device 102 under the condition of meeting the water intake start-up condition is acceptable. For example, in a more detailed embodiment, the boiled water start-up condition includes the water input device 111 being turned on, the water input device 111 storing an appropriate amount of water, the first heating device 102 being turned on and running, and the outlet water temperature of the second heating device 103 being lower than the target set temperature. The water input device 111 being turned on further includes the water pump 1112 of the water input device 111 being turned on and running, and the water input device 111 storing an appropriate amount of water includes the water level in the water tank 1111 of the water input device 111 being higher than the preset minimum water level.

[0093] Please see Figure 8 In one embodiment, the water heating system further includes a first temperature detector 104, which is disposed at the outlet of the second heating device 103 and is connected to a control device.

[0094] The water heating system also includes a second temperature detector 703 and / or a third temperature detector 704. The second temperature detector 703 is located at the water inlet 107, and the third temperature detector 704 is located at the water outlet of the first heating device 102. The second temperature detector 703 and the third temperature detector 704 are respectively connected to a control device (not shown).

[0095] Specifically, in practical scenarios, the water heating system uses a first temperature detector 104 at the outlet of the second heating device to collect the outlet water temperature, thus ensuring the reliability of the water heating system. Furthermore, the water heating system can be configured to use a second temperature detector 703 only at the water inlet 107. In this case, feedback adjustments based on the detection results of the second temperature detector 703 can change the outlet water temperature of the first heating device 102, ultimately ensuring that the boiled water output from the water inlet 107 meets the user's requirements, i.e., the target outlet water temperature. This method effectively saves on hardware costs.

[0096] Alternatively, the water heating system can be configured with a third temperature detector 704 only at the outlet of the first heating device 102. In this case, based on feedback from the second temperature detector 704, the outlet water temperature of the first heating device 102 is adjusted to the temperature corresponding to the heat exchange water, thus ensuring that the boiled water output from the water inlet 107 meets the user's needs. This method can also effectively save on hardware costs.

[0097] Furthermore, in one embodiment, the water heating system simultaneously provides a second temperature detector 703 at the water inlet 107 and a third temperature detector 704 at the water outlet of the first heating device 102. In this scenario, the water outlet temperature of the first heating device 102 and the actual water intake temperature can be combined for feedback adjustment to ensure that the boiled water output from the water inlet 107 is what the user needs, thus having higher adjustment accuracy.

[0098] For ease of understanding, the explanation is based on the simultaneous setting of a second temperature detector 703 and a third temperature detector 704. The second temperature detector 703 is used to detect the water temperature and send it to the control device, while the third temperature detector 704 is used to detect the water temperature output by the first heating device 102 and send it to the control device.

[0099] In this embodiment, the control device is also used to: obtain the water intake temperature of the water heating system during the zero-cold-water heating operation; and when the water intake temperature is detected to reach the target outlet temperature, execute the operation of controlling the first heating device 102 to output the first heat exchange water at a set temperature corresponding to the target outlet temperature, and controlling the second heating device 103 to output boiling water.

[0100] Specifically, during the zero-cold-water supply process, the control device also acquires the water intake temperature of the water inlet 107 in real time, which is the actual temperature of the boiled water output. Then, it compares and analyzes the intake temperature with the target outlet temperature to determine whether the temperature of the boiled water output from the zero-cold-water system reaches the target outlet temperature. If the target outlet temperature is reached, the control device exits the zero-cold-water control logic and switches to the multi-temperature-segment water intake control logic. That is, the control device adjusts the heating power of the first heating device 102 and the second heating device 103, as well as the inlet flow rate of the first heating device 102, based on the target outlet temperature. This ensures that the first heating device 102 outputs first heat exchange water at the set temperature corresponding to the target outlet temperature, and the second heating device 103 outputs boiling water, achieving a stable boiled water output at the target outlet temperature.

[0101] In a more detailed embodiment, taking a target outlet water temperature of 55°C as an example, when the detected water temperature reaches 55°C, the multi-temperature segment water intake control logic is switched: the first heating device 102 switches to a steady-state power of 700W, and the water input device 111 is adjusted by an algorithm to output water at a corresponding flow rate of 0.95L / min. At this time, the inlet water temperature of the first water path 1011 is 35°C (set temperature), and the outlet water temperature output by the second heating device 103 is 100°C. The 35°C first heat exchange water in the first water path 1011 is heated to 80°C by boiling water and flows into the second heating device 103 for reheating. The second heating device 103 adjusts its power in real time to ensure that the outlet water temperature is 100°C (boiling point), and the boiling water is cooled to 55°C by the water in the first water path 1011. The switching time interval of this process is in the millisecond range, which can realize a seamless switching from zero cold water to steady-state water intake.

[0102] In another embodiment, the control device is also configured to increase the inlet flow rate of the first heating device 102 according to the second inlet water temperature of the second heating device 103.

[0103] Specifically, through the heat exchange and secondary utilization of the first water channel 1011 and the second water channel 1012, the inlet water temperature of the second heating device 103 gradually increases with the increase of heat exchange time. Therefore, during operation, the second inlet water temperature of the second heating device 103 is obtained in real time. According to the principle of energy conservation during the heat exchange process of the first water channel 1011 and the second water channel 1012, the overall water flow rate and overall power of the unit should satisfy: 4187*(T2-T1)*V=P*η, where T2 and T1 represent the temperatures before and after heat exchange, V represents the inlet water flow rate, P represents the overall power, and η represents the overall efficiency. In this way, it can be ensured that the water heating system has the maximum overall water flow rate when the power is constant, and the overall power is determined by the voltage and current of the power supply (mains power is usually limited to 2100W). In this way, the inlet flow rate of the first heating device 102 can be gradually increased during the operation of the water heating system, thereby increasing the amount of cooked water output from the water intake 107, realizing the preparation of large-flow cooked water, and effectively improving the cooking water preparation efficiency of the water heating system.

[0104] The aforementioned water heating system includes a heat exchange device 101 comprising a first water path 1011 and a second water path 1012, which exchange heat in opposite directions. The outlet of the first heating device 102 and the inlet of the second heating device 103 are connected to the same water path, while the outlet and intake 107 of the second heating device 103 are connected to another water path. During actual operation, the outlet temperature of the second heating device 103 can be obtained, and if the zero-cold-water heating condition is met, the first heating device 102 can be directly controlled to heat the input water to boiling. Thus, boiling water input from one water path can heat water previously stored in the other water path connected to the intake 107, and the water is output through the intake 107, achieving zero-cold-water operation. Alternatively, by combining the target outlet water temperature, the first inlet water temperature of the first heating device 102, and the outlet water temperature of the second heating device 103, the first heating device 102 can be controlled to output first heat exchange water at a set temperature corresponding to the target outlet water temperature to a connected water path, while the second heating device 103 can be controlled to output boiling water to another water path. In this way, during the transmission of the boiling water through the other water path, it will be cooled by the first heat exchange water transmitted through the water path connected to the first heating device 102, resulting in boiled water consistent with the user's needs. If the target outlet water temperature changes, simply by controlling and changing the set temperature of the second heat exchange water output by the first heating device 102 to the connected water path, the boiling water transmitted through the other water path can be cooled to the same temperature as the changed target outlet water. Through the above scheme, instantaneous fresh boiled water preparation with zero cold water and instantaneous fresh boiled water preparation at multiple temperature ranges can be achieved, demonstrating strong overall machine performance.

[0105] This application also provides a boiled water machine, including the water heating system described above.

[0106] Specifically, the water heating system is as shown in the above embodiments and accompanying drawings, and will not be repeated here. The heat exchange device of the above-mentioned boiled water machine includes a first water path and a second water path, which exchange heat in opposite directions. The outlet of the first heating device and the inlet of the second heating device are connected to the same water path. The outlet and intake of the second heating device are respectively connected to another water path, and a first temperature detector is installed at the outlet of the second heating device. In actual operation, the outlet temperature of the second heating device can be obtained in real time, and if the zero-cold-water heating condition is met, the first heating device is directly controlled to heat the input water to boiling. Thus, the boiling water input from one water path can heat the water originally stored in the other water path connected to the intake, and output through the intake, achieving zero-cold-water operation. Alternatively, by combining the target outlet temperature, the first inlet temperature of the first heating device, and the outlet temperature of the second heating device, the first heating device is controlled to output first heat exchange water at a set temperature corresponding to the target outlet temperature to a connected water path, and the second heating device is controlled to output boiling water to another water path. In this way, during the transmission of boiling water through another water path, it is cooled by the first heat exchange water transmitted through the water path connected to the first heating device, resulting in boiled water that meets the user's needs. If the target outlet water temperature changes, simply controlling the set temperature of the second heat exchange water output from the first heating device to the connected water path will bring the boiling water transmitted through the other water path to a temperature consistent with the changed target outlet water temperature. Through this scheme, instantaneous fresh boiled water preparation with zero cold water and multi-temperature-segment instantaneous fresh boiled water preparation can be achieved, demonstrating strong overall machine performance.

[0107] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A water heating system, characterized in that, include: water intake; A heat exchange device includes a first water passage and a second water passage, wherein the first water passage and the second water passage exchange heat in opposite directions of water flow. A first heating device and a second heating device, wherein the inlet of the first heating device is used to input water to be heated; the outlet of the first heating device is connected to the inlet of the second heating device through the first water passage, and the outlet of the second heating device is connected to the water intake through the second water passage, or the outlet of the first heating device is connected to the inlet of the second heating device through the second water passage, and the outlet of the second heating device is connected to the water intake through the first water passage. A control device is connected to the first heating device and the second heating device respectively. The control device is used to control the first heating device to output boiling water according to the first inlet water temperature of the first heating device when it is determined that the zero cold water heating condition is met.

2. The water heating system according to claim 1, characterized in that, The first water passage is a heat exchange outer pipe, and the second water passage is a heat exchange inner pipe, with the heat exchange inner pipe sleeved within the water storage space of the heat exchange outer pipe.

3. The water heating system according to claim 2, characterized in that, Both the outer heat exchange tube and the inner heat exchange tube are bent tubes, and / or the inner wall of the inner heat exchange tube has a corrugated turbulence shape.

4. The water heating system according to any one of claims 1-3, characterized in that, It also includes a water input device, the water inlet of the first heating device being connected to the water input device.

5. The water heating system according to any one of claims 1-3, characterized in that, The first heating device is an instant heating device.

6. The water heating system according to claim 5, characterized in that, The second heating device is an instant heating device or a heat storage heating device.

7. The water heating system according to any one of claims 1-3, characterized in that, The water heating system further includes a first temperature detector, which is located at the outlet of the second heating device and connected to the control device. The water heating system further includes a second temperature detector and / or a third temperature detector. The second temperature detector is located at the water inlet, and the third temperature detector is located at the water outlet of the first heating device. The second temperature detector and the third temperature detector are respectively connected to the control device.

8. The water heating system according to any one of claims 1-3, characterized in that, The control device is also used to control the first heating device to output first heat exchange water at a set temperature corresponding to the target outlet temperature, based on the first inlet water temperature, the outlet water temperature of the second heating device, and the target outlet water temperature, and to control the second heating device to output boiling water, so that the water outlet outputs cooked water with the same temperature as the target outlet water.

9. The water heating system according to claim 8, characterized in that, The control device is further configured to, when determining that the multi-temperature range water intake conditions are met based on the outlet water temperature, determine the inlet flow rate of the first heating device based on the target outlet water temperature and the first inlet water temperature, and control the first heating device to heat water at the inlet water flow rate to output the first heat exchange water.

10. The water heating system according to claim 8, characterized in that, The control device is also used to increase the inlet flow rate of the first heating device according to the second inlet water temperature of the second heating device.

11. The water heating system according to claim 8, characterized in that, The control device is also used to switch the output of the first heating device to a second heat exchange water with a set temperature corresponding to the changed target outlet water temperature when the target outlet water temperature changes, so as to maintain the output of boiling water from the second heating device, so that the water outlet outputs cooked water with the same temperature as the changed target outlet water.

12. The water heating system according to claim 11, characterized in that, The control device is also used to switch the output of the first heating device to a second heat exchange water with a set temperature corresponding to the changed target outlet water temperature by changing at least one of the following methods: changing the inlet flow rate of the first heating device, changing the heating power of the first heating device, and changing the heating power of the second heating device, thereby maintaining the output of boiling water from the second heating device.

13. The water heating system according to claim 1, characterized in that, The control device is further configured to determine the inlet flow rate of the first heating device based on the difference between the boiling point temperature and the first inlet water temperature, and to determine the boiling water heating power of the first heating device based on the inlet flow rate and the difference, and to control the first heating device to operate at the boiling water heating power to output boiling water.

14. The water heating system according to claim 13, characterized in that, The control device is also used to check whether the multi-temperature water intake condition is met when the first heating device outputs boiling water, based on the water intake temperature of the water outlet, and when the multi-temperature water intake condition is met, to switch the control of the first heating device to output first heat exchange water at a set temperature corresponding to the target outlet water temperature, and to control the second heating device to output boiling water, so that the water outlet outputs cooked water with the same temperature as the target outlet water.

15. The water heating system according to claim 4, characterized in that, The water input device includes a water tank and a water pump, the water tank is connected to the water pump, and the water pump is connected to the water inlet of the first heating device.

16. The water heating system according to claim 15, characterized in that, The water input device also includes a purification device, and the water tank is connected to the water pump through the purification device.

17. The water heating system according to claim 4, characterized in that, The water input device includes a water tank and a purified water pump. The water tank is connected to the purified water pump, and the purified water pump is connected to the water inlet of the first heating device.

18. The water heating system according to claim 17, characterized in that, The water input device also includes a level detector, which is installed in the water tank and connected to the control device.

19. A water purifier, characterized in that, Includes the water heating system according to any one of claims 1-18.

Images