Heating device and water purifier

Abstract

The utility model provides a heating device and a water purifier, the heating device is provided with a water inlet and a hot water outlet, the heating device further comprises a water tank, a hot water way and a valve assembly, and the hot water way comprises a heating body and a water pump which are arranged in series; the valve assembly comprises a valve water inlet, a first valve water outlet and a second valve water outlet, the valve water inlet is connected to a water outlet of the hot water way, the first valve water outlet is connected to a water inlet of the water tank through a backflow pipeline, and the second valve water outlet is connected to the hot water outlet. The lower valve water inlet of the valve assembly is communicated to the first valve water outlet when the valve assembly is located at the first station, the lower valve water inlet of the valve assembly is communicated to the second valve water outlet when the valve assembly is located at the second station, and the valve assembly is located at the first station when the water temperature in the hot water pipeline located at the downstream of the heating body is lower than an expected value; the valve assembly is located at the second station when the water temperature is higher than or equal to the expected value. As a result, a desired value of water can be provided to a user without cold water.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field, specifically, relate to a kind of embedded water purifier. BACKGROUND

[0002] With the development of the times, people's requirements for drinking water quality are higher and higher, and water purifiers have been recognized and purchased by most people. Water purifiers can purify water in tap water or water storage tanks to provide high-quality water to users. The water purifiers on the market can include desktop water purifiers, under-the-counter water purifiers and embedded water purifiers, etc.

[0003] At present, various types of water purifiers or pipeline machines with heating function have appeared on the market. The over-flow type heating assembly is widely welcomed because it can quickly provide hot water and the temperature control is more accurate. The over-flow type heating assembly can heat when the water to be heated flows through it. Even if the water to be heated passes through after stopping heating, the water temperature will hardly rise. Therefore, the pipeline connected to the over-flow type heating assembly can be used to provide hot water or normal temperature water.

[0004] For some application scenarios such as tea making, users want the initial water to have a high water temperature when taking water. Since the existing pipeline machine or water purifier is designed to prevent the over-flow type heating assembly from dry burning, it will pump a portion of water before heating to fill the pipeline, which may result in a lower water temperature when the user first takes the water, which cannot meet the user's demand. SUMMARY

[0005] To at least partially solve the problems in the prior art, some embodiments of the utility model provide a heating device with a water inlet and a hot water outlet, comprising: a water tank, the water inlet of the water tank is connected to the water inlet; a hot water path, the water inlet of the hot water path is connected to the water outlet of the water tank, and the hot water path comprises a heating body and a water pump arranged in series; and a valve assembly, the valve assembly comprises a valve water inlet, a first valve outlet and a second valve outlet, the valve water inlet is connected to the water outlet of the hot water path, the first valve outlet is connected to the water inlet of the water tank through a backflow pipeline, and the second valve outlet is connected to the hot water outlet, the valve assembly has a first station and a second station, the valve water inlet is communicated to the first valve outlet when the valve assembly is in the first station, and the valve water inlet is communicated to the second valve outlet when the valve assembly is in the second station, wherein: when the water temperature in the hot water path downstream of the heating body is lower than the expected value, the valve assembly is in the first station; and when the water temperature is higher than or equal to the expected value, the valve assembly is in the second station. Through the valve assembly, water that does not meet the expected value can be backflowed to the water tank, so as to avoid providing water with a lower temperature to the user. This part of water can be backflowed to the water tank, so that the heating device does not need to be provided with a drain, and this part of water will not be wasted. Thus, the user can be provided with water with the expected value without cold water.

[0006] Exemplarily, the heating device further comprises a first temperature sensor arranged on the hot water pipeline downstream of the heating body, and a controller configured to control the valve assembly to switch from the first position to the second position when the water temperature detected by the first temperature sensor is higher than or equal to the expected value. After the heating body starts heating, it can be determined that all the water output in the first time duration of the water pump is heated by the heating body, so as to determine the water temperature. The water temperature can be accurately obtained by the first temperature sensor, and the water temperature is controlled. Such control is more direct and accurate, and over-heating or misjudgment does not occur.

[0007] Exemplarily, the heating device further comprises a controller configured to determine the water temperature according to the time accumulated in response to the user's water taking operation, and control the valve assembly to switch from the first position to the second position when the water temperature is higher than the expected value. According to the difference in the position of the heating body installed on the hot water pipeline, after the heating body starts heating, only a small part of the water may not be heated sufficiently by the heating body due to being downstream of the heating body. Therefore, the valve assembly can be kept in the first position for a second time duration less than the first time duration, and then switched to the second position to provide the water with a temperature higher than the expected value to the user. Thus, the user's waiting time can also be reduced.

[0008] Exemplarily, the heating device further comprises a second temperature sensor configured to detect the water temperature in the water tank, and a controller configured to control the water pump and the heating body to work when the water temperature detected by the second temperature sensor is lower than a preset water storage temperature, and control the valve assembly to be in the first position. In this way, the water in the water tank can be heated by the heating body in circulation, so that the water temperature in the water tank reaches the preset water storage temperature, and the water preheated twice is provided to the user when the user takes water. When the user's expected value is high, the user can be provided with hot water with a large flow rate, and the flow rate of the water output will not be limited due to the limitation of the power of the heating body. Optionally, the preset water storage temperature can be within a suitable range, for example, not lower than 45 degrees and not higher than 50 degrees. In this way, while ensuring that the user can be provided with hot water with a large flow rate, energy waste caused by heat dissipation of the water tank is reduced, and the water pump does not need to bear high temperature. Optionally, the preset water storage temperature can be determined by experiment and written into the controller when the heating device is shipped. Optionally, the preset water storage temperature can be set by the user.

[0009] Exemplarily, the valve assembly is configured to make the valve water inlet port selectively communicate with the first valve water outlet port or the second valve water outlet port. In this way, the valve assembly has only two working states, and the control logic can be simplified.

[0010] Exemplarily, the valve assembly comprises a valve housing, a valve water inlet, a first valve water outlet and a second valve water outlet are arranged on the valve housing, and a valve core is arranged in the valve housing and is movable in the valve housing, so that the valve assembly has a first working position and a second working position. Compared with a valve assembly formed by combining multiple electromagnetic valves, the valve assembly has a smaller volume.

[0011] Exemplarily, the heating device further comprises a water outlet assembly, a hot water outlet is arranged on the water outlet assembly, and a distance between the second valve water outlet of the valve assembly and a water inlet of the water outlet assembly on a water path is less than a preset distance threshold. In this way, the length of a pipeline from the valve assembly to the hot water outlet can be reduced, and the temperature loss of hot water provided to a user after circulation in the pipeline can be reduced.

[0012] Exemplarily, the heating device comprises a third temperature sensor configured to detect a water temperature in a hot water pipeline upstream of the heating body, and a controller configured to adjust a power of the heating body based on the water temperature detected by the third temperature sensor. In this way, it can be calculated how much power is required to heat the water to a desired value, so as to accurately control the water temperature provided to the user, prevent the water from being splashed due to excessive heating power, and prevent the water temperature from fluctuating due to control of the water temperature by the first temperature sensor only. In the embodiment in which the heating device comprises the second temperature sensor, the third temperature sensor can also be arranged to avoid uneven distribution of the water temperature in the water tank, and to prevent the water temperature from fluctuating due to determination of the heating power by the temperature of the second temperature sensor.

[0013] Another aspect of the present application also provides a water purifier, comprising the above-mentioned heating device, and a filtering device, a purified water outlet of the filtering device being connected to a water inlet of the heating device. Hot water prepared by the purified water is provided to the user, scale is not generated in the pipeline, and the purified water generally does not contain harmful heavy metals and other impurities, so that the user experience is better.

[0014] Exemplarily, the heating device further comprises a water level detection assembly configured to detect a water level in the water tank, and the filtering device starts to prepare water when the water level detected by the water level detection assembly is lower than a preset water level. In this way, the water tank can be automatically and timely replenished.

[0015] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the specific embodiment part. The utility model content part does not mean trying to limit the key features and necessary technical features of the claimed technical solution, and does not mean trying to determine the protection scope of the claimed technical solution.

[0016] The advantages and characteristics of the present application will be described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The following drawings for the utility model are hereby incorporated as part of the utility model for the purpose of understanding the utility model. The drawings shown in the utility model embodiments and their descriptions are used to explain the principles of the utility model. In the drawings,

[0018] Figure 1 Water circuit diagram of the heating assembly according to one exemplary embodiment of the utility model;

[0019] Figure 2 Water circuit diagram of the heating assembly according to one exemplary embodiment of the utility model.

[0020] Among them, the above-mentioned drawings include the following figure marks:

[0021] 10, water inlet; 20, hot water outlet; 100, water tank; 200, hot water circuit; 210, heating body; 220, water pump; 300, return line; 400, valve assembly; 410, valve water inlet; 420, first valve water outlet; 430, second valve water outlet; 500, first temperature sensor; 600, second temperature sensor; 700, third temperature sensor; 800, filtering device. DETAILED DESCRIPTION

[0022] In the following description, a large number of details are provided so that the utility model can be thoroughly understood. However, those skilled in the art can understand that the following description only exemplarily shows the preferred embodiments of the utility model, and the utility model can be implemented without one or more such details. In addition, in order to avoid confusion with the utility model, some technical features known in the art are not described in detail.

[0023] In order to thoroughly understand the embodiments of the utility model, detailed structures will be proposed in the following description. Obviously, the implementation of the embodiments of the utility model is not limited to the special details familiar to those skilled in the art. The preferred embodiments of the utility model are described in detail as follows, however, in addition to these detailed descriptions, the utility model can also have other embodiments.

[0024] The embodiments of the utility model provide a kind of heating device. The heating device according to the embodiments of the utility model will be introduced in detail in the following with reference to drawings. As shown in Figure 1As shown, the heating device has a water inlet 10 and a hot water outlet 20. Optionally, the water inlet 10 can be used to receive water to be heated, such as bottled water, tap water, water filtered by a water purification assembly, etc. The hot water outlet 20 can provide heated water to a user. The heating device can further include a water tank 100, an inlet of which is connected to the water inlet 10. The water tank 100 is used to store water to be heated. Optionally, the water inlet 10 of the heating device can be connected to a filtration device 800, and the water tank 100 can store a large amount of purified water produced by the filtration device 800, and when a user takes water, the water tank 100 can provide the user with the product. In this way, the service life of the filtration device 800 can be extended. Optionally, the filtration device 800 can be a small flux (less than 400 gallons of water per day), and the water tank 100 can store purified water when the user does not take water to meet the user's demand for large flux water taking.

[0025] The heating device can include a hot water circuit 200, an inlet of which can be connected to an outlet of the water tank 100. The hot water circuit 200 can include a heating body 210 and a water pump 220 arranged in series. The heating body 210 can include, but is not limited to, a thick film heating body 210, an electromagnetic heater, and other existing or future possible heating elements. Thus, the heating body 210 can have a tubular heating flow channel. Optionally, the heating flow channel of the heating body 210 can be vertical, with the inlet below and the outlet above. In this way, the water to be heated can completely fill the heating flow channel after entering it. Here, vertical does not require it to be perpendicular to the horizontal plane, and it is allowed to have a certain angle with the plumb line. Optionally, the water pump 220 can be arranged upstream of the heating body 210 and will not be affected by the hot water flowing out of the heating body 210 when working. The water pump 220 can send the water pump 220 to a height above the liquid level of the water tank 100, and can effectively increase the water outlet flow and improve the user experience. Optionally, the water pump 220 can control the flow, and when the user expects to take hot water with a higher temperature, it can provide the user with hot water with a more accurate temperature, avoiding the water flow being too large to heat in time and making the water temperature lower.

[0026] The heating device can comprise a valve assembly 400. The valve assembly 400 can comprise a valve inlet 410 connected to the outlet of the hot water circuit 200, a first valve outlet 420 connected to the inlet of the water tank 100 through the return circuit 300, and a second valve outlet 430 connected to the hot water outlet 20. The valve assembly 400 can have a first position and a second position. The valve assembly 400 can be an electrically controlled component, or can be configured to be manually operated. Alternatively, the valve assembly 400 can be composed of multiple separate solenoid valves. Alternatively, the valve assembly 400 can be configured as a single unit (as mentioned below). In general, the valve assembly 400 can control the connection of the water circuits. Specifically, when the valve assembly 400 is in the first position, the valve inlet 410 is connected to the first valve outlet 420, and when the valve assembly 400 is in the second position, the valve inlet 410 is connected to the second valve outlet 430.

[0027] The valve assembly 400 is in the first position when the temperature of the water in the hot water circuit downstream of the heating body 210 is lower than a desired value, and is in the second position when the temperature of the water is higher than or equal to the desired value. The desired value is the temperature of the water that the user desires to obtain. As mentioned above, to avoid dry heating of the heating body 210, a sufficient amount of water can be pumped into the hot water circuit 200 by the water pump 220 before the heating body 210 starts heating, so that the water to be heated completely fills the heating body 210. After the heating body 210 starts heating, the water output from the heating body 210 is all hot water. The temperature of the hot water can be detected by the first temperature sensor 500 mentioned below, or can be determined according to the heating power, the flow rate of the water pump 220, and the temperature of the water to be heated. In an exemplary embodiment capable of providing boiling water, the valve assembly 400 is in the first position, and the flow rate of the water pump 220 can be matched with the power of the heating body 210, so that boiling water can be provided. The hot water passing through the heating body 210 can enter the valve assembly 400 through the valve inlet 410, return to the inlet of the water tank 100 through the first valve outlet 420 and the return circuit 300, so that the water with a lower temperature initially used to prevent dry heating is returned to the water tank 100. Thereafter, the valve assembly 400 is switched to the second position, so that boiling water is provided to the user. Alternatively, the user can manually switch the valve assembly 400 from the first position to the second position to obtain water after the water pump 220 has been operated for a period of time, for example, by a handle or the like. In other embodiments, alternatively, the water pump 220 and the heating body 210 can have a matching flow rate and power according to the desired value of the user, so that hot water with a temperature not lower than the desired value is provided, and the valve assembly 400 is switched to avoid providing water that does not meet the desired value to the user. Alternatively, the valve assembly 400 can also close the valve inlet 410, so that the valve inlet 410 is not connected to either of the first valve outlet 420 or the second valve outlet 430.

[0028] In some embodiments of the heating assembly, when the heating element 210 first starts heating, its own temperature rise takes time. Therefore, besides the water downstream of the heating element 210 that is not directly heated by it, the water initially passing through the heating element 210 may not reach the desired temperature. Some embodiments of the heating assembly may also slowly increase the power at the beginning of heating to avoid thermal shock affecting the lifespan of the heating element 210. This can also cause the hot water temperature provided by the heating element 210 to be below the desired value for a period of time. In summary, the valve assembly 400 can return the water that does not meet the desired temperature to the water tank 100, thereby preventing the supply of cold water to the user. This water can be returned to the water tank 100, eliminating the need for a drain outlet in the heating device and preventing waste. Thus, the desired water temperature can be provided to the user with zero cold water.

[0029] Exemplarily, the heating device may also include a controller, which can determine the water temperature based on the accumulated time in response to the user's water intake operation, and control the valve assembly 400 to switch from a first position to a second position when the water temperature is higher than the desired value. As described above, before the heating element 210 starts heating, the controller can control the water pump 220 to operate for a first duration, thereby ensuring that the water entering the hot water circuit 200 is sufficient to fill the heating element 210. After the heating element 210 starts heating, it can be determined that during the first duration of operation of the water pump 220, all the water output is water heated by the heating element 210, thus determining the water temperature. Depending on the installation position of the heating element 210 on the hot water circuit 200, after the heating element 210 starts heating, only a small portion of the water may not be fully heated by the heating element 210 because it is downstream of the heating element 210. Therefore, the valve assembly 400 can be kept in the first position for a second duration shorter than the first duration before switching to the second position to provide water at a temperature higher than the desired value to the user. This can also reduce the user's waiting time.

[0030] The controller can be constructed using electronic components such as comparators, registers, and digital logic circuits, or implemented using processor chips such as microcontrollers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and application-specific integrated circuits (ASICs) and their peripheral circuits.

[0031] For example, the heating device may also include a first temperature sensor 500, which is disposed on a hot water pipe downstream of the heating element 210. The first temperature sensor 500 may include existing temperature sensors such as thermocouples, resistance temperature detectors (RTDs), infrared temperature sensors, or future temperature sensors. The controller may also control the valve assembly 400 to switch from a first position to a second position when the water temperature detected by the first temperature sensor 500 is higher than or equal to a desired value. As mentioned above, because some of the heated water flows back to the water tank 100, the water temperature in the water tank 100 gradually increases. This makes it difficult to implement a scheme that controls the water temperature solely by controlling the heating time and water flow rate. During the heating process, the water temperature may become too high and boil over. With the first temperature sensor 500, the water temperature can be accurately obtained and controlled. This control is more direct and precise, preventing overheating or misjudgment.

[0032] For example, the heating device may further include a second temperature sensor 600, which may include existing or future temperature sensors. The second temperature sensor 600 may be located inside or outside the water tank 100, and is used to detect the water temperature inside the water tank 100. The controller may also be used to control the water pump 220 and the heating element 210 to operate when the water temperature detected by the second temperature sensor 600 is lower than a preset storage temperature, and to control the valve assembly 400 to be in a first position. Specifically, for example, the controller may control the water pump 220 and the heating element 210 to operate, and to control the valve assembly 400 to be in a first position, when the water temperature indicated by the second temperature sensor 600 is lower than 45 degrees Celsius. This allows the heating element 210 to circulate and heat the water in the water tank 100, raising the water temperature inside the tank 100 to the preset storage temperature. Thus, when the user draws water, the preheated water is reheated and provided to the user. When the user's expectations are high, hot water can be provided to the user at a larger flow rate, without the flow rate being limited by the power of the heating element 210. Optionally, the preset water storage temperature can be within a suitable range, such as not lower than 45 degrees Celsius and not higher than 50 degrees Celsius. This ensures a large flow of hot water for the user while reducing energy waste caused by heat dissipation from the water tank 100, and the water pump 220 does not need to withstand high temperatures. Optionally, the preset water storage temperature can be experimentally determined and programmed into the controller at the factory. Optionally, the preset water storage temperature can be set by the user.

[0033] For example, valve assembly 400 can be configured such that valve inlet 410 is selectively connected to either first valve outlet 420 or second valve outlet 430. In other words, valve assembly 400 may have only two positions, and may not be configured such that valve inlet 410 is neither connected to first valve outlet 420 nor second valve outlet 430. Optionally, valve assembly 400 may include a solenoid valve and a pressure valve that can be opened under pressure. When valve assembly 400 is open, water pumped by pump 220 can be supplied to the user without generating sufficient water pressure to open the pressure valve. When valve assembly 400 is closed, water pumped by pump 220 can open the pressure valve, and water flows back to water tank 100. Optionally, valve assembly 400 may be configured to have a movable valve core. Therefore, when the user is not using hot water, the valve assembly 400 can remain in a state where the valve inlet 410 is connected to the first valve outlet 420, cutting off the connection between the water tank 100 and the outside world and preventing bacteria from entering. When the user uses hot water, the valve assembly 400 can connect the valve inlet 410 to the second valve outlet 430 to provide hot water to the user. Thus, the valve assembly 400 has only two operating states, simplifying the control logic.

[0034] Exemplarily, the valve assembly 400 may further include a valve housing, on which the valve inlet 410, the first valve outlet 420, and the second valve outlet 430 are all disposed. The valve assembly 400 may also include a valve core disposed within the valve housing, and the valve core is movable within the valve housing, giving the valve assembly 400 a first position and a second position. In some specific embodiments, the valve core can move between the first and second positions under the drive of an electromagnet. In other embodiments, the valve assembly 400 may include a motor that can drive the valve core to move between the first and second positions. Optionally, the valve core can move translationally between the first and second positions within the valve housing. Optionally, the valve core can rotate, thereby moving between the first and second positions. Compared to a valve assembly 400 formed by combining multiple solenoid valves, the above-described valve assembly 400 is generally smaller in size.

[0035] For example, the heating device may further include a water outlet assembly. The water outlet assembly may include a faucet, a spout, or similar structure, with the hot water outlet 20 disposed on the water outlet assembly. The distance in the water path between the second valve outlet 430 of the valve assembly 400 and the inlet of the water outlet assembly is less than a preset distance threshold. Optionally, the valve assembly 400 may be installed inside the faucet or spout. This reduces the pipe length from the valve assembly 400 to the hot water outlet 20, and reduces temperature loss of the hot water supplied to the user after circulation in the pipe.

[0036] Exemplarily, the heating device may also include a third temperature sensor 700 for detecting the water temperature in the hot water pipe upstream of the heating element 210. The third temperature sensor 700 may also include existing or future temperature sensors. The controller may also be used to adjust the power of the heating element 210 based on the water temperature detected by the third temperature sensor 700. This allows for the calculation of the required power to heat the water to the desired value, thereby precisely controlling the water temperature supplied to the user and preventing excessive heating power that could cause boiling and splashing, or water temperature fluctuations caused by relying solely on the first temperature sensor 500 for temperature control. In embodiments where the heating device includes a second temperature sensor 600, a third temperature sensor 700 may also be provided to avoid uneven water temperature distribution within the water tank 100, and to determine water temperature fluctuations caused by heating power determined by the temperature of the second temperature sensor 600.

[0037] Another aspect of this application provides a water purifier, which includes the heating device described in the above embodiments and a filtration device 800, with the purified water outlet of the filtration device 800 connected to the water inlet 10 of the heating device. Hot water is prepared by purifying the water and provided to the user. No scale will be generated in the pipes, and the purified water generally does not contain harmful heavy metals or other impurities, resulting in a better user experience.

[0038] For example, the heating device also includes a water level detection component for detecting the water level in the water tank 100. The filtration device 800 starts producing water when the water level detected by the water level detection component is lower than a preset water level. The water level detection component may include existing or future water level sensors such as float level gauges, ultrasonic level gauges, and infrared level gauges. The water level detection component can be installed inside or outside the water tank 100, depending on the type of sensor used. This allows for automatic and timely replenishment of water to the water tank 100.

[0039] In the description of this utility model, it should be understood that the directional terms such as "front", "rear", "up", "down", "left", "right", "horizontal", "vertical", "horizontal", "top", and "bottom" indicate the orientation or positional relationship, which are usually based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0040] For ease of description, relative terms such as "above," "over," "on the upper surface of," and "above" are used here to describe the regional positional relationship of one or more components or features shown in the figures to other components or features. It should be understood that relative terms include not only the orientation of the component as depicted in the figure but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0042] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0043] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the utility model to the described embodiments. Furthermore, those skilled in the art will understand that this utility model is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this utility model, all of which fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heating device having a water inlet and a hot water outlet, characterized in that, include: A water tank, wherein the water inlet of the water tank is connected to the water outlet; A hot water circuit, wherein the inlet of the hot water circuit is connected to the outlet of the water tank, and the hot water circuit includes a heating element and a water pump connected in series; as well as A valve assembly includes a valve inlet, a first valve outlet, and a second valve outlet. The valve inlet is connected to the outlet of the hot water circuit. The first valve outlet is connected to the inlet of the water tank via a return pipe. The second valve outlet is connected to the hot water outlet. The valve assembly has a first position and a second position. When the valve assembly is in the first position, the valve inlet is connected to the first valve outlet. When the valve assembly is in the second position, the valve inlet is connected to the second valve outlet. The valve assembly is in the first operating position when the water temperature in the hot water pipe downstream of the heating element is lower than the desired value; and The valve assembly is in the second operating position when the water temperature is higher than or equal to the desired value.

2. The heating device according to claim 1, characterized in that, The heating device also includes: A first temperature sensor is disposed on a hot water pipe downstream of the heating element; and A controller that controls the valve assembly to switch from the first station to the second station when the water temperature detected by the first temperature sensor is higher than or equal to the desired value.

3. The heating device according to claim 1, characterized in that, The heating device further includes a controller, which is used to determine the water temperature based on the accumulated time in response to the user's water intake operation, and to control the valve assembly to switch from the first station to the second station when the water temperature is higher than the expected value.

4. The heating device according to claim 1, characterized in that, The heating device also includes: A second temperature sensor is used to detect the water temperature in the water tank; and The controller is used to control the water pump and the heating element to work when the water temperature detected by the second temperature sensor is lower than the preset water storage temperature, and to control the valve assembly to be in the first working position.

5. The heating device according to claim 1, characterized in that, The valve assembly is configured such that the valve inlet is selectively connected to either the first valve outlet or the second valve outlet.

6. The heating device according to claim 5, characterized in that, The valve assembly includes: The valve housing, wherein the valve inlet, the first valve outlet, and the second valve outlet are all disposed on the valve housing; and A valve core is disposed within the valve housing and is movable within the valve housing, thereby enabling the valve assembly to have a first working position and a second working position.

7. The heating device according to claim 1, characterized in that, The heating device also includes a water outlet assembly, and the hot water outlet is disposed on the water outlet assembly. The distance between the second valve outlet of the valve assembly and the inlet of the outlet assembly in the water path is less than a preset distance threshold.

8. The heating device according to claim 1, characterized in that, The heating device includes: A third temperature sensor for detecting the water temperature in the hot water pipe upstream of the heating element; and A controller for adjusting the power of the heating element based on the water temperature detected by the third temperature sensor.

9. A water purifier, characterized in that, include: The heating device as described in any one of claims 1-8; as well as A filtration device, wherein the purified water outlet of the filtration device is connected to the water inlet of the heating device.

10. The water purifier according to claim 9, characterized in that, The heating device also includes a water level detection component for detecting the water level in the water tank, and the filtration device starts producing water when the water level detected by the water level detection component is lower than a preset water level.

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