Water dispenser with waste heat recovery and hydraulic system thereof

Abstract

The application discloses a water dispenser with waste heat recovery and a hydraulic system thereof, and relates to the technical field of water dispensers. The water dispenser with waste heat recovery comprises a water tank, a water pump, a heater, a first temperature obtainer and a controller. The water tank is used for containing drinking water, and the heater is used for heating the drinking water. The inlet of the water pump is communicated with the inner cavity of the water tank, and the outlet of the water pump is communicated with the water inlet of the heater. The first temperature obtainer is used for obtaining the temperature of the drinking water flowing out of the water outlet of the heater. The controller is signal-connected with the first temperature obtainer and the water pump, is used for receiving the temperature data of the drinking water before heating, and controls the flow rate and working time of the water pump, so that the water outlet efficiency of the target temperature hot water can be improved.

Description

Technical Field

[0001] This application relates to the field of water dispenser technology, and more specifically, to a water dispenser with waste heat recovery and its hydraulic system. Background Technology

[0002] Instant hot water dispensers are household water devices that use electronic heating technology to quickly dispense hot water. Currently, instant hot water dispensers typically use a constant flow rate mode. To achieve the target water temperature, the power of the heating module needs to be adjusted. That is, when a higher water temperature is needed, the efficiency of the heating module is increased, and vice versa. However, in order to meet the needs of a wide range of water temperatures, the flow rate of drinking water is generally set to be relatively low, making it difficult to fully utilize the performance of the entire machine.

[0003] In conclusion, how to improve the output efficiency of hot water at the target temperature is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a water dispenser with waste heat recovery that can improve the efficiency of hot water output at the target temperature.

[0005] Another objective of this application is to provide a hydraulic system for use in the aforementioned water dispenser with waste heat recovery.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A water dispenser with waste heat recovery includes: a water tank, a water pump, a heater, a first temperature sensor, and a controller;

[0008] The water tank is used to hold drinking water, and the heater is used to heat the drinking water;

[0009] The inlet of the water pump is connected to the inner cavity of the water tank, and the outlet of the water pump is connected to the inlet of the heater;

[0010] The first temperature acquisition device is used to acquire the temperature of the drinking water flowing out of the heater outlet;

[0011] The controller signal is connected to the first temperature acquisition device and the water pump, and is used to receive the temperature data of the drinking water before heating, and to control the flow rate and working time of the water pump.

[0012] Preferably, the bottom of the water tank has a water outlet, and the inlet of the water pump is connected to the water outlet of the water tank;

[0013] The top of the water tank has a water inlet, and the water inlet of the water tank is equipped with an on / off control valve for controlling the opening and closing of the water inlet;

[0014] The water tank is equipped with a first water level detector and a second water level detector. The first water level detector is located on top of the second water level detector. The first water level detector is used to detect whether the water level in the water tank has risen to the highest water level, and the second water level detector is used to detect whether the water level in the water tank has dropped to the lowest water level.

[0015] The controller signal is connected to the on / off control valve, the first water level detector, and the second water level detector to receive water level data and control the operation of the on / off control valve.

[0016] Preferably, the water tank has a return water inlet and further includes a first reversing valve, the first reversing valve having an inlet A, an outlet B and an outlet C, and the inlet A of the first reversing valve can be selectively connected to the outlet B or the outlet C, the outlet of the heater is connected to the inlet A of the first reversing valve, and the outlet C of the first reversing valve is connected to the return water inlet.

[0017] The controller signal is connected to the first reversing valve and is used to control the inlet A of the first reversing valve to be connected to the outlet B or outlet C.

[0018] Preferably, the controller has a signal acquisition module and a main control module;

[0019] The signal acquisition module is used to acquire the working mode, and the working mode includes sterilization mode and water intake mode;

[0020] The main control module is connected to the first directional valve and is used to control the inlet A of the first directional valve to be connected to the outlet B or outlet C.

[0021] Preferably, the main control module is connected to the water pump and is used to control the start and stop of the water pump;

[0022] The controller has a delay module, which is connected to the main control module. The delay module receives the signal from the main control module to control the heater to stop working, and after a delay, sends a signal to the main control module to control the water pump to stop working.

[0023] Preferably, it further includes a second temperature acquisition unit, and the controller signal is connected to the second temperature acquisition unit;

[0024] Both the first temperature acquisition device and the second temperature acquisition device are temperature detectors;

[0025] The first temperature acquisition device is located in the heater, and the probe of the first temperature acquisition device is inserted into the water outlet channel of the heater;

[0026] The second temperature sensor is located at the bottom of the water tank, and the probe of the second temperature sensor is inserted inside the water tank.

[0027] Preferably, the water tank is equipped with a float ball inside, which can move close to close the water inlet or move away to open the water inlet.

[0028] Preferably, the inlet end of the heater is equipped with a flow detector for detecting the flow rate of drinking water flowing into the heater;

[0029] The controller signal is connected to the flow detector to receive flow data.

[0030] Preferably, it also includes a second directional valve, a bypass line, and a flow regulating valve;

[0031] The inlet A of the second reversing valve is connected to the outlet of the water tank, the outlet B of the second reversing valve is connected to the inlet of the water pump, the outlet C of the second reversing valve is connected to the first end of the bypass pipeline, and the inlet A of the second reversing valve can be selectively connected to the outlet B or the outlet C, and the second end of the bypass pipeline is connected to the inlet of the heater.

[0032] The flow regulating valve is located in the bypass pipeline. The controller is signal-connected to the flow regulating valve, the second reversing valve, and the heater, and is used to control the operation of the second reversing valve and the flow regulating valve, as well as to control the heating power of the heater.

[0033] A hydraulic system for a water dispenser with waste heat recovery is applied to any of the above-mentioned water dispensers with waste heat recovery, wherein the hydraulic system for the water dispenser with waste heat recovery includes the water tank, the water pump, and the heater.

[0034] In this application, the water tank is a hollow tank used to hold and store drinking water. The inlet of the water pump is connected to the inner cavity of the water tank, so that the drinking water in the water tank can be drawn out. The outlet of the water pump is connected to the inlet of the heater, so that the drinking water can be heated before being output.

[0035] The beneficial effect is that the water dispenser is equipped with a first temperature acquisition device and a controller. When in use, after the controller receives the temperature data transmitted by the first temperature acquisition device, that is, after receiving the temperature parameters of the drinking water before heating, it can determine the matching water pump flow rate based on the target heating power of the heater, the temperature data of the drinking water before heating, and the water volume and water temperature set as needed, so that the drinking water reaches the target water temperature after flowing through the heater, and determines the working time of the matching water pump, thereby outputting the target water volume. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the hydraulic principle of the specific embodiments provided in this application;

[0038] Figure 2 This is a schematic diagram of the control principle of the specific embodiments provided in this application;

[0039] Figure 3 A schematic diagram of a hydraulic principle capable of flow regulation, provided in a specific embodiment of this application;

[0040] Figure 4 A schematic diagram of another hydraulic principle capable of flow regulation, which is provided for a specific embodiment of this application;

[0041] Figure 5 A schematic diagram of the water intake mode for a specific embodiment provided in this application;

[0042] Figure 6 This is a schematic diagram of the sterilization mode of a specific embodiment provided in this application.

[0043] Figure label:

[0044] 1-Water tank; 2-Water pump; 3-Heater; 4-First temperature sensor; 5-Second temperature sensor; 6-Controller; 61-Signal acquisition module; 62-Main control module; 63-Delay module; 7-Float; 8-First directional valve; 9-On / off control valve; 10-First water level detector; 11-Second water level detector; 12-Flow detector; 13-Second directional valve; 14-Bypass pipeline; 15-Flow regulating valve; 16-Third directional valve; 17-First check valve; 18-Second check valve. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] The core of this application is to provide a water dispenser with waste heat recovery, which can improve the efficiency of dispensing hot water at the target temperature. Another core aspect of this application is to provide a hydraulic system applied to the aforementioned water dispenser with waste heat recovery.

[0047] This application provides a water dispenser with waste heat recovery, including a water tank 1, a water pump 2, a heater 3, a first temperature acquisition device 4, and a controller 6; wherein, the water tank 1 is used to contain drinking water, and the heater 3 is used to heat the drinking water; the inlet of the water pump 2 is connected to the inner cavity of the water tank 1, and the outlet of the water pump 2 is connected to the inlet of the heater 3; the first temperature acquisition device 4 is used to acquire the temperature of the drinking water flowing out of the outlet of the heater 3; the controller 6 is signal-connected to the first temperature acquisition device 4 and the water pump 2, and is used to receive the temperature data of the drinking water before heating, and control the flow rate and working time of the water pump 2.

[0048] refer to Figure 1 and Figure 2 As explained, water tank 1 is a hollow tank used to hold and store drinking water. The inlet of water pump 2 is connected to the inner cavity of water tank 1, so that drinking water in water tank 1 can be drawn out. The outlet of water pump 2 is connected to the inlet of heater 3, so that drinking water can be heated before being output.

[0049] The beneficial effect is that the water dispenser is equipped with a first temperature sensor 4 and a controller 6. When using it, refer to... Figure 5 As explained, after receiving the temperature data transmitted from the first temperature acquisition unit 4, i.e., after receiving the temperature parameters before the drinking water is heated, the controller 6 can determine the flow rate of the matching water pump 2 based on the target heating power of the heater 3, the temperature data before the drinking water is heated, and the water intake quantity Q and water intake temperature T2 set as needed. This allows drinking water to reach the target water intake temperature T2 after flowing through heater 3, and determines the working time t of the matched water pump 2, thereby outputting the target water intake volume Q. Then, the heater can be heated at its maximum heating power P, fully utilizing the performance of the whole machine to improve the output efficiency of hot water at the target temperature.

[0050] In some embodiments, the temperature of the drinking water flowing into heater 3, or the temperature of the drinking water in water tank 1, is T1, while the temperature of the drinking water flowing out of heater 3, or the water intake temperature, is T2. The heating power of heater 3 is P, and the isobaric specific heat capacity of the drinking water is defined or set as C, and the density is... Furthermore, the specific heat capacity C and density of drinking water at constant pressure For values ​​already known, it should be noted that the isobaric specific heat capacity C of the drinking water refers to the value at temperature T1. Therefore, based on the drinking water temperature T1 in water tank 1, the water intake temperature T2, the heating power P of heater 3, and the isobaric specific heat capacity C of the drinking water, the flow rate of pump 2 is determined. The method is as follows: Correspondingly, the method for determining the operating time t of water pump 2 based on the water intake Q is as follows: .

[0051] Based on the above embodiment, the bottom of the water tank 1 has an outlet, and the inlet of the water pump 2 is connected to the outlet of the water tank 1; the top of the water tank 1 has an inlet, and the inlet of the water tank 1 is equipped with an on / off control valve 9 for controlling the opening and closing of the inlet; the inside of the water tank 1 is equipped with a first water level detector 10 and a second water level detector 11, the first water level detector 10 is located on top of the second water level detector 11, and the first water level detector 10 is used to detect whether the water level in the water tank 1 has risen to the highest water level, and the second water level detector 11 is used to detect whether the water level in the water tank 1 has dropped to the lowest water level; the controller 6 is signal-connected to the on / off control valve 9, the first water level detector 10 and the second water level detector 11, for receiving water level data and controlling the operation of the on / off control valve 9.

[0052] refer to Figure 1 As explained, a water outlet is provided at the bottom of water tank 1, and the inlet of water pump 2 is connected to the water outlet of water tank 1 through a pipeline to facilitate the extraction of drinking water from water tank 1.

[0053] To replenish water to tank 1 and meet water supply needs, the inlet of tank 1 is located at its top, and an on / off control valve 9 is installed on the pipeline connected to the inlet to control the opening and closing of the water inlet channel. The on / off control valve 9 can be a switch valve or a two-position two-way valve, etc. Correspondingly, a first water level detector 10 and a second water level detector 11 are also installed to detect whether the liquid level in tank 1 has reached the target maximum liquid level or the target minimum liquid level, respectively. In use, the first water level detector 10 and the second water level detector 11 detect the liquid level of drinking water in tank 1 in real time and transmit the detected liquid level signal to the controller 6. After receiving the signal from the second water level detector 11, the controller 6 controls the on / off control valve 9 to open so that drinking water can be replenished to tank 1. During the water replenishment process, after receiving the signal from the first water level detector 10, the controller controls the on / off control valve 9 to close, that is, to stop replenishing drinking water to tank 1.

[0054] It should be noted that the target highest liquid level and the target lowest liquid level can refer to thresholds or liquid level ranges, etc.

[0055] Based on the above embodiment, the water tank 1 has a return water port and also includes a first reversing valve 8. The first reversing valve 8 has an inlet A, an outlet B and an outlet C, and the inlet A of the first reversing valve 8 can be selectively connected to the outlet B or the outlet C. The outlet of the heater 3 is connected to the inlet A of the first reversing valve 8, and the outlet C of the first reversing valve 8 is connected to the return water port. The controller 6 is signal-connected to the first reversing valve 8 and is used to control the inlet A of the first reversing valve 8 to be connected to the outlet B or the outlet C.

[0056] refer to Figure 1 and Figure 2 As explained, water tank 1 is equipped with a return water inlet. A first reversing valve 8 is installed between the outlet of heater 3, the water nozzle, and the return water inlet of water tank 1. Specifically, the first reversing valve 8 includes at least three openings: inlet A, outlet B, and outlet C. Inlet A of the first reversing valve 8 is connected to the outlet of heater 3, while outlet C of the first reversing valve 8 is connected to the return water inlet of water tank 1. Outlet B of the first reversing valve 8 can be connected to the water nozzle. In use, the controller 6 controls the inlet A of the first reversing valve 8 to connect to outlet B as needed. Figure 5 As shown, it can spray out heated drinking water to meet usage needs, or, when the inlet A of the first reversing valve 8 is connected to the outlet C, as... Figure 6 As shown, it can guide heated drinking water back into water tank 1.

[0057] It should be noted that the types of the first directional valve 8, the second directional valve 13, and the third directional valve 16 are not limited, as long as the connection requirements described above are met. For example, a two-position three-way valve or a three-position four-way valve, etc. It should also be noted that any two of the first directional valve 8, the second directional valve 13, and the third directional valve 16 can be the same or different.

[0058] When the inlet A of the first reversing valve 8 is connected to the outlet B, the hot water supply needs of the water dispenser can be met. When the inlet A of the first reversing valve 8 is connected to the outlet C, the heated drinking water can be guided back to the water tank 1, thus avoiding waste. The heated drinking water can also be used to sterilize and disinfect the hydraulic system at a low cost.

[0059] Based on the above embodiments, the controller 6 has a signal acquisition module 61 and a main control module 62; the signal acquisition module 61 is used to acquire the working mode, and the working mode includes sterilization mode and water intake mode; the main control module 62 is signal-connected to the first reversing valve 8 and is used to control the inlet A of the first reversing valve 8 to be connected to the outlet B or outlet C.

[0060] refer to Figure 2 As explained, the signal acquisition module 61 is connected to the main control module 62, so that the signal input from the outside through the signal acquisition module 61 can be received by the main control module 62, so as to control the internal components of the water dispenser.

[0061] In some embodiments, the signal acquisition module 61 is used to acquire the working mode. For example, the signal acquisition module 61 includes two buttons: one is a sterilization control button, and the other is a water dispensing control button. After pressing the corresponding button, the main control module 62 can control the opening connection state of the first reversing valve 8. Optionally, in sterilization mode, after the main control module 62 receives the signal of water dispensing mode, it controls the inlet A of the first reversing valve 8 to connect to the outlet C; or, in water dispensing mode, after the main control module 62 receives the signal of sterilization mode, it controls the inlet A of the first reversing valve 8 to connect to the outlet B.

[0062] Furthermore, the signal acquisition module 61 is also used to acquire the water intake volume Q and the water intake temperature T2. For example, the signal acquisition module 61 includes devices such as a keyboard and mouse, so that the target value or target range can be input to meet diverse water intake needs.

[0063] Of course, the function of the signal acquisition module 61 is not limited to the examples above, as long as it meets the control requirements. It should also be noted that the specific structure of the signal acquisition module 61 is not limited to the embodiments described above; for example, it can also use a touch screen, as long as it meets the signal input requirements.

[0064] Based on the above embodiment, the main control module 62 is connected to the water pump 2 to control the start and stop of the water pump 2; the controller 6 has a delay module 63, which is connected to the main control module 62 to receive the signal from the main control module 62 to control the heater 3 to stop working, and after a delay, sends a signal to the main control module 62 to control the water pump 2 to stop working.

[0065] refer to Figure 2 As can be seen, the controller 6 is also equipped with a delay module 63. The delay module 63 is a structure capable of timing. When in use, while the main control module 62 controls the heater 3 to stop working, it sends a signal to the delay module 63 to start timing. After the timing ends, the main control module 62 controls the water pump 2 to stop working so that the heat can be carried back to the water tank 1, reducing the internal temperature of the whole machine, preventing equipment aging, and improving the life of the whole machine.

[0066] refer to Figure 1 and Figure 2 As can be seen, based on the above embodiment, a second temperature acquisition device 5 is also included. The controller 6 is connected to the second temperature acquisition device 5, which can detect the actual water temperature to determine the usage status of the water dispenser.

[0067] Optionally, both the first temperature acquisition device 4 and the second temperature acquisition device 5 are temperature detectors; the first temperature acquisition device 4 is located in the heater 3, and the probe of the first temperature acquisition device 4 is inserted into the water outlet channel of the heater 3; the second temperature acquisition device 5 is located at the bottom of the water tank 1, and the probe of the second temperature acquisition device 5 is inserted into the inside of the water tank 1.

[0068] Of course, the first temperature acquisition device 4 and the second temperature acquisition device 5 are not limited to the structure that can directly detect the temperature as described above. They can also be sub-controllers, which can transmit the temperature parameters to the controller 6.

[0069] Based on the above embodiment, the water tank 1 is provided with a float 7 inside. The float 7 can be brought close to close the water inlet or moved away to open the water inlet.

[0070] refer to Figure 1 As explained, to prevent drinking water from overflowing from water tank 1, a float ball 7 is installed in the top space of the inner cavity of water tank 1. The rise and fall of the float ball 7 is used to control the opening and closing of the water inlet. When the on / off control valve 9 malfunctions and cannot control the water supply to stop, the water supply channel can be closed by buoyancy.

[0071] Based on the above embodiment, the inlet end of the heater 3 is provided with a flow detector 12 for detecting the flow rate of drinking water flowing into the heater 3; the controller 6 is connected to the flow detector 12 for receiving flow data.

[0072] refer to Figure 3 As explained, during the process of using the water dispenser to provide hot water, the flow detector 12 detects the flow in real time. After transmitting the flow signal to the controller 6, the actual water output can be calculated to determine the usage status of the water dispenser.

[0073] Based on the above embodiment, it also includes a second reversing valve 13, a bypass pipeline 14, and a flow regulating valve 15; the inlet A of the second reversing valve 13 is connected to the outlet of the water tank 1, the outlet B of the second reversing valve 13 is connected to the inlet of the water pump 2, the outlet C of the second reversing valve 13 is connected to the first end of the bypass pipeline 14, and the inlet A of the second reversing valve 13 can be selectively connected to the outlet B or the outlet C, and the second end of the bypass pipeline 14 is connected to the inlet of the heater 3; the flow regulating valve 15 is provided in the bypass pipeline 14, and the controller 6 is signal connected to the flow regulating valve 15, the second reversing valve 13, and the heater 3, for controlling the operation of the second reversing valve 13 and the flow regulating valve 15, and controlling the heating power of the heater 3.

[0074] refer to Figure 3As explained, in this embodiment, a bypass pipeline 14 connected in parallel with the pump is provided. When water needs to be pumped by the water pump 2, the controller 6 can control the inlet A and outlet C of the second reversing valve 13 to be connected. When water needs to be supplied by the bypass pipeline 14, the controller 6 can control the inlet A and outlet B of the second reversing valve 13 to be connected. That is, the second reversing valve 13 can select to use the pump or the bypass pipeline 14 for water supply. A flow regulating valve 15 is provided on the bypass pipeline 14 to adjust the flow rate of drinking water delivered to the heater 3. In the event of a failure in the mode of adjusting the flow rate and working time of the water pump 2 by fixing the power of the heater 3, the power of the heater 3 can be adjusted according to the flow rate to meet the outlet water temperature requirements.

[0075] Optionally, in some embodiments, such as Figure 3 As shown, it also includes a third directional valve 16. The controller 6 is signal-connected to the third directional valve 16, and the outlet A of the third directional valve 16 is connected to the water inlet of the heater 3, the inlet B of the third directional valve 16 is connected to the outlet of the water pump 2, and the inlet C of the third directional valve 16 is connected to the second end of the bypass pipeline 14. The outlet A of the third directional valve 16 can be selectively connected to the inlet B or the inlet C. When water needs to be pumped by the water pump 2, the controller 6 can control the inlet A of the second directional valve 13 to be connected to the outlet C, and control the inlet C of the third directional valve 16 to be connected to the outlet A. When water needs to be supplied by the bypass pipeline 14, the controller 6 can control the inlet A of the second directional valve 13 to be connected to the outlet B, and control the inlet B of the third directional valve 16 to be connected to the outlet A. Therefore, in this embodiment, the second directional valve 13 can select to use the pump or the bypass pipeline 14 for water supply, and the third directional valve 16 can prevent backflow to the other pipeline when selecting one water supply path.

[0076] Optionally, in some embodiments, such as Figure 4 As shown, it also includes a first check valve 17 and a second check valve 18. The first check valve 17 is installed in the branch pipeline connected to the outlet end of the pump, and the second check valve 18 is installed in the bypass pipeline 14. In this embodiment, the first check valve 17 and the second check valve 18 can prevent backflow to the other pipeline when one water supply is selected.

[0077] Furthermore, the working mode acquired by the signal acquisition module 61 also includes a maintenance mode. Correspondingly, the main control module 62 is connected to the second directional valve 13 to control the inlet A of the second directional valve 13 to be connected to the outlet B or outlet C. Specifically, in the maintenance mode, after the main control module 62 receives the maintenance mode signal, it controls the inlet A of the second directional valve 13 to be connected to the outlet B so that water can be supplied through the bypass pipeline 14.

[0078] In addition to the water dispenser with waste heat recovery described above, this application also provides a hydraulic system for the water dispenser with waste heat recovery disclosed in the above embodiments. The hydraulic system includes a water tank 1, a water pump 2, a heater 3, and a first temperature acquisition device 4 of the water dispenser with waste heat recovery.

[0079] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities; the terms "upper surface," "lower surface," "top," and "bottom" and the directional terms "upper," "lower," "left," and "right" mentioned above are defined based on the accompanying drawings in the specification.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0081] The above provides a detailed description of the water dispenser with waste heat recovery and its hydraulic system provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A water dispenser with waste heat recovery, characterized in that, include: Water tank (1), water pump (2), heater (3), first temperature acquisition device (4), controller (6); The water tank (1) is used to hold drinking water, and the heater (3) is used to heat the drinking water; The inlet of the water pump (2) is connected to the inner cavity of the water tank (1), and the outlet of the water pump (2) is connected to the inlet of the heater (3); The first temperature acquisition device (4) is used to acquire the temperature of the drinking water flowing out of the outlet of the heater (3); The controller (6) is connected to the first temperature acquisition device (4) and the water pump (2) to receive the temperature data of the drinking water before heating and to control the flow rate and working time of the water pump (2).

2. The water dispenser with waste heat recovery according to claim 1, characterized in that, The bottom of the water tank (1) has a water outlet, and the inlet of the water pump (2) is connected to the water outlet of the water tank (1); The top of the water tank (1) has a water inlet, and the water inlet of the water tank (1) is equipped with an on / off control valve (9) for controlling the opening and closing of the water inlet; The water tank (1) is equipped with a first water level detector (10) and a second water level detector (11). The first water level detector (10) is located on top of the second water level detector (11). The first water level detector (10) is used to detect whether the water level in the water tank (1) has risen to the highest water level, and the second water level detector (11) is used to detect whether the water level in the water tank (1) has dropped to the lowest water level. The controller (6) is connected to the on / off control valve (9), the first water level detector (10) and the second water level detector (11) to receive water level data and control the operation of the on / off control valve (9).

3. The water dispenser with waste heat recovery according to claim 1, characterized in that, The water tank (1) has a return water outlet and also includes a first reversing valve (8). The first reversing valve (8) has an inlet A, an outlet B and an outlet C. The inlet A of the first reversing valve (8) can be selectively connected to the outlet B or the outlet C. The outlet of the heater (3) is connected to the inlet A of the first reversing valve (8), and the outlet C of the first reversing valve (8) is connected to the return water outlet. The controller (6) is connected to the first reversing valve (8) to control the inlet A of the first reversing valve (8) to be connected to the outlet B or outlet C.

4. The water dispenser with waste heat recovery according to claim 3, characterized in that, The controller (6) has a signal acquisition module (61) and a main control module (62). The signal acquisition module (61) is used to acquire the working mode, and the working mode includes sterilization mode and water intake mode; The main control module (62) is connected to the first reversing valve (8) and is used to control the inlet A of the first reversing valve (8) to be connected to the outlet B or outlet C.

5. The water dispenser with waste heat recovery according to claim 4, characterized in that, The main control module (62) is connected to the water pump (2) and is used to control the start and stop of the water pump (2); The controller (6) has a delay module (63), which is connected to the main control module (62) to receive the signal from the main control module (62) to control the heater (3) to stop working, and after a delay, sends a signal to the main control module (62) to control the water pump (2) to stop working.

6. The water dispenser with waste heat recovery according to claim 1, characterized in that, It also includes a second temperature acquisition unit (5), and the controller (6) is connected to the second temperature acquisition unit (5); Both the first temperature acquisition device (4) and the second temperature acquisition device (5) are temperature detectors; The first temperature acquisition device (4) is located on the heater (3), and the probe of the first temperature acquisition device (4) is inserted into the water outlet channel of the heater (3); The second temperature acquisition device (5) is located at the bottom of the water tank (1), and the probe of the second temperature acquisition device (5) is inserted inside the water tank (1).

7. The water dispenser with waste heat recovery according to claim 2, characterized in that, The water tank (1) is equipped with a float (7) inside, which can move close to close the water inlet or move away to open the water inlet.

8. The water dispenser with waste heat recovery according to claim 1, characterized in that, The inlet end of the heater (3) is equipped with a flow detector (12) for detecting the flow rate of drinking water flowing into the heater (3); The controller (6) is connected to the flow detector (12) to receive flow data.

9. The water dispenser with waste heat recovery according to claim 8, characterized in that, It also includes a second directional valve (13), a bypass line (14), and a flow regulating valve (15). The inlet A of the second reversing valve (13) is connected to the outlet of the water tank (1), the outlet B of the second reversing valve (13) is connected to the inlet of the water pump (2), the outlet C of the second reversing valve (13) is connected to the first end of the bypass pipe (14), and the inlet A of the second reversing valve (13) can be selectively connected to the outlet B or the outlet C. The second end of the bypass pipe (14) is connected to the inlet of the heater (3). The flow regulating valve (15) is located in the bypass pipeline (14). The controller (6) is connected to the flow regulating valve (15), the second reversing valve (13) and the heater (3) to control the operation of the second reversing valve (13) and the flow regulating valve (15), as well as to control the heating power of the heater (3).

10. A hydraulic system for a water dispenser with waste heat recovery, characterized in that, The water dispenser with waste heat recovery as described in any one of claims 1-9 is provided, wherein the hydraulic system of the water dispenser with waste heat recovery includes the water tank (1), the water pump (2), the heater (3), and the first temperature acquisition device (4).

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