Instantaneous drinking water machine with residual water return

Abstract

The utility model provides a provide residual water backflow's instant drinking water machine, including casing, water outlet nozzle, water tank and the host computer in the casing, the host computer includes control circuit board, heating body, the water pump who links with heating body water inlet end, the water inlet pipeline of connecting between water pump and water tank, the water outlet pipeline of connecting between heating body water outlet and water outlet nozzle, set up in the temperature sensor and solenoid valve of water outlet pipeline, heating body, water pump, temperature sensor and solenoden are all with control circuit board electricity is connected, still include the backwater pipeline of connecting between water outlet pipeline and water inlet pipeline through solenoid valve, control circuit board when the actual water temperature of water outlet pipeline is lower than the set water outlet temperature controls solenoid valve to make water outlet pipeline and backwater pipeline connect and make residual water in water outlet pipeline backflow to heating body through backwater pipeline, only when the actual water temperature of water outlet pipeline reaches the set water outlet temperature control solenoid valve switches to make water outlet pipeline and water outlet nozzle connect, to realize accurate flow out required hot water.

Description

Technical Field

[0001] This utility model relates to the field of water dispenser technology, and in particular to an instant hot water dispenser that provides residual water return. Background Technology

[0002] Instant hot water dispensers can quickly provide hot water at selectable temperatures and volumes, making them very convenient to use and widely used in homes and various public places. However, existing instant hot water dispensers immediately close the water valve after the user has taken water, leaving some residual water in the outlet pipes. When the user takes water again, the dispenser will first dispense this residual water, and the temperature of this residual water may not meet the user's desired target temperature.

[0003] Chinese patent CN222622735U discloses a water circuit structure that utilizes gravity to reflux residual water, suitable for water dispensers with a heating function. After water is dispensed and the water pump is shut off, an electrically controlled valve opens to connect with atmospheric pressure, allowing residual water in the outlet pipe to flow downwards under its own weight into the water chamber or receiving container. This reduces the amount of residual water in the pipes and improves the accuracy of the temperature when the user dispenses hot or warm water next time. However, this technical solution requires the water pump and faucet to be positioned above the highest liquid level in the water chamber, and therefore cannot be widely applied to instant hot water dispensers of various structures. Utility Model Content

[0004] To address the problems in related technologies, this utility model proposes an instant hot water dispenser that provides residual water return. By setting up a return water pipe between the water outlet pipe and the heating element, which is controlled by a solenoid valve to open or close, the residual water in the water outlet pipe returns to the heating element.

[0005] This utility model proposes an instant hot water dispenser that provides residual water return, including a casing, a water outlet, a water tank, and a main unit located inside the casing. The main unit includes a control circuit board, a heating element, a water pump connected to the water inlet of the heating element, an inlet pipe connected between the water pump and the water tank, an outlet pipe connected between the water outlet of the heating element and the water outlet, a temperature sensor and a solenoid valve installed in the outlet pipe, and the heating element, water pump, temperature sensor, and solenoid valve are all electrically connected to the control circuit board. It also includes a return water pipe connected between the outlet pipe and the inlet pipe through the solenoid valve. When the actual water temperature in the outlet pipe is lower than the set outlet water temperature, the control circuit board controls the solenoid valve to connect the outlet pipe and the return water pipe so that the residual water in the outlet pipe returns to the heating element through the return water pipe. Only when the actual water temperature in the outlet pipe reaches the set outlet water temperature, the control circuit board controls the solenoid valve to switch to connecting the outlet pipe and the water outlet.

[0006] Preferably, the solenoid valve has one inlet and two outlets; the outlet pipe includes a first outlet pipe and a second outlet pipe, the first outlet pipe is connected between the outlet end of the heating element and the inlet of the solenoid valve, the second outlet pipe is connected between one outlet of the solenoid valve and the outlet nozzle, and the other outlet of the solenoid valve is connected to the return water pipe.

[0007] Preferably, the temperature sensor is installed in the second water outlet pipe.

[0008] Preferably, the solenoid valve is fixed inside the housing by a mounting base, and the outlet connected to the return water pipe is located below the outlet connected to the second outlet pipe.

[0009] Preferably, the end of the water inlet pipe is equipped with a water inlet valve, which is connected to the water tank.

[0010] Preferably, the inlet valve has a three-way structure, including a first inlet port connected to the water tank, a second inlet port connected to the return water pipe, and an outlet port connected to the inlet water pipe. The second inlet port of the inlet valve is connected to the outlet port of the inlet valve.

[0011] Preferably, the heating element is installed vertically, with the water inlet end of the heating element located at the bottom end and the water outlet end located at the top end of the heating element.

[0012] Preferably, the water pump is fixed to the heating element near the water inlet end of the heating element.

[0013] Preferably, the heating element is fixed to the vertical side plate of the housing by a bracket.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes the coordinated operation of a solenoid valve and a return water pipe. The control circuit board controls the solenoid valve to, at the initial startup of the water dispenser, pump residual water in the outlet pipe and water flowing from the heating element's outlet that has not reached the set temperature back into the heating element via the return water pipe. This prevents residual water in the outlet pipe and water flowing from the heating element's outlet that has not reached the set temperature from flowing out of the spout, achieving precise dispensing of the required hot water and improving the user experience of the water dispenser.

[0015] In addition, this utility model only requires one water pump, eliminating the need for an additional water pump as in existing technologies. Furthermore, the location of the water pump is not specifically required, as existing technologies do not require the water pump to be positioned higher than the water outlet. This simplifies the implementation structure of the water dispenser, reduces implementation costs, and improves the universality of the main unit in different types of water dispensers. Attached Figure Description

[0016] Figure 1 This is a 3D structural diagram of an instant hot water dispenser.

[0017] Figure 2 This is a schematic diagram of the exploded structure of an instant hot water dispenser.

[0018] Figure 3 This is one of the three-dimensional structural diagrams of the main unit of an instant hot water dispenser.

[0019] Figure 4 This is the second three-dimensional structural diagram of the main unit of the instant hot water dispenser. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0021] Combination Figure 1 and Figure 2 As shown, the instant hot water dispenser (hereinafter referred to as "water dispenser") includes a casing 1, a water outlet 2 on the casing, a water tank 3, and a main unit 4 located inside the casing 1. The main unit 4 pumps water from the water tank 3 to the main unit 4 for heating and then the water flows out from the water outlet 2, thereby providing users with hot water quickly as needed.

[0022] The main unit 4 specifically includes a control circuit board (not shown in the attached figure), an inlet valve 41 connected to the water tank 3, a heating element 42 for heating water, a water pump 43 connected to the inlet end of the heating element 42, an inlet pipe 44 connected between the water pump 43 and the inlet valve 41, an outlet pipe connected between the outlet end of the heating element 42 and the outlet nozzle 2, a temperature sensor (not shown in the attached figure) and a solenoid valve 46 installed in the outlet pipe. The heating element 42, the water pump 43, the temperature sensor and the solenoid valve 46 are all electrically connected to the control circuit board.

[0023] The improvement and innovation of this utility model in water dispenser is as follows: the main unit 4 also includes a return water pipe 48 connected between the water outlet pipe and the water inlet pipe 44 via a solenoid valve 46; when the water dispenser is started, the control circuit board causes the heating element 42 and the water pump 43 to start in conjunction, that is, the water pump 43 generates pumping force to send the water in the water tank 3 into the heating element 42, and the heating element 42 is simultaneously energized to heat the water. The control circuit board detects the actual water temperature in the water outlet pipe through a temperature sensor. When the actual water temperature in the water outlet pipe is lower than the set water temperature, the control solenoid valve 46 is controlled to connect the water outlet pipe and the return water pipe 48 so that the residual water in the water outlet pipe and the water that has not reached the set water temperature flowing out from the water outlet of the heating element 42 are returned to the heating element 42 through the return water pipe 48 under the action of the pumping force of the water pump 43 for further heating and circulation. Only when the actual water temperature in the water outlet pipe reaches the set water temperature is the control solenoid valve 46 switched to connect the water outlet pipe and the water outlet 2, so that only hot water that has reached the set water temperature flows out of the water outlet 2.

[0024] Therefore, this utility model, through the coordinated operation of the solenoid valve 46 and the return water pipe 48, controls the solenoid valve 46, which, at the initial stage of starting the water dispenser, uses the pump 43 to generate pumping force to return residual water in the outlet pipe and water flowing out of the outlet of the heating element 42 that has not reached the set outlet temperature, back into the heating element 42 through the return water pipe 48. This prevents residual water in the outlet pipe and water flowing out of the outlet of the heating element 42 that has not reached the set outlet temperature from flowing out of the water outlet 2, thus achieving precise dispensing of the required hot water and improving the user experience of the water dispenser.

[0025] In addition, this utility model only requires one water pump 43, which eliminates the need for an additional water pump as in the prior art. Furthermore, the position of the water pump 43 is not specifically required, as the water pump does not need to be positioned higher than the water outlet 2 as in the prior art. This simplifies the implementation structure of the water dispenser, reduces implementation costs, and improves the universality of the main unit 4 in different types of water dispensers.

[0026] The solenoid valve 46 has one inlet and two outlets. The outlet pipes specifically include a first outlet pipe 45 and a second outlet pipe 47. The first outlet pipe 45 is connected between the outlet end of the heating element and the inlet of the solenoid valve 46. The second outlet pipe 47 is connected between one outlet of the solenoid valve 46 and the outlet nozzle. The other outlet of the solenoid valve 46 is connected to the return water pipe 48.

[0027] The solenoid valve 46 is fixed inside the housing 1 by the mounting base 52, and the outlet connected to the return water pipe 48 is located below the outlet connected to the second outlet pipe 47, so that the residual water and water with unsatisfactory temperature in the outlet pipe can more easily flow back to the heating element 42 through the return water pipe 48.

[0028] Typically, a temperature sensor is installed in the second water outlet pipe 47 to more accurately detect the actual water temperature inside the outlet pipe.

[0029] In addition, an inlet valve 41 is provided at the end of the inlet pipe 44, which is connected to the water tank 3.

[0030] The present invention sets the water inlet valve 41 as a three-way structure. The water inlet valve 41 includes a first water inlet interface connected to the water tank 3, a second water inlet interface connected to the return water pipe 48, and a water outlet interface connected to the water inlet pipe 44. The second water inlet interface of the water inlet valve 41 is connected to the water outlet interface of the water inlet valve 41.

[0031] By setting the inlet valve 41 to a three-way structure, there is no need to set a separate return valve in the return water pipe 48. The inlet valve 41 integrates the function of the return valve, simplifies the overall structure, and can simultaneously meet the actual needs of inlet, outlet and return water.

[0032] In addition, the heating element 42 is set vertically, with the water inlet end of the heating element 42 located at the bottom end and the water outlet end of the heating element 43 located at the top end of the heating element 42. This is beneficial to improve the heating effect of the heating element 42 on the water: the water with a lower temperature enters from the bottom end of the heating element 42 under the action of the water pump 43, and is then rapidly heated during the process of slowly rising inside the heating element 42, before flowing out from the water outlet end of the heating element 43 to the first water outlet pipe 45.

[0033] This invention eliminates the need to limit the height of the water pump 43 relative to the outlet 2. Typically, the water pump 43 is fixed to the heating element 42 near the water inlet end of the heating element, or even the water outlet of the water pump 43 is directly connected to the water inlet end of the heating element. This reduces the number of pipes connecting the water pump 43 to the water inlet end of the heating element, further simplifying the overall structure.

[0034] Inside the casing 1, the main unit 4 and the water tank 3 are usually arranged side by side to ensure balanced weight distribution throughout the water dispenser, preventing tipping and ensuring stable and reliable operation. For this purpose, a vertical side panel is typically installed inside the casing 1, dividing the interior into two parts. The main unit 4 is located in one part of the casing 1, and the heating element 42 is generally fixed to the vertical side panel of the casing 1 via a bracket 49. The water tank 3 is located in the other part of the casing 1. The vertical side panel serves to isolate and protect the main unit 4 relative to the water tank 3.

[0035] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An instant hot water dispenser providing residual water recirculation, comprising a casing, a water outlet, a water tank, and a main unit located within the casing. The main unit includes a control circuit board, a heating element, a water pump connected to the water inlet of the heating element, a water inlet pipe connected between the water pump and the water tank, a water outlet pipe connected between the water outlet of the heating element and the water outlet, a temperature sensor and a solenoid valve disposed in the water outlet pipe, wherein the heating element, water pump, temperature sensor, and solenoid valve are all electrically connected to the control circuit board; characterized in that... Also includes: The return water pipe is connected between the outlet water pipe and the inlet water pipe via a solenoid valve; When the actual water temperature in the outlet pipe is lower than the set outlet temperature, the control circuit board controls the solenoid valve to connect the outlet pipe and the return pipe, allowing the residual water in the outlet pipe to flow back to the heating element through the return pipe. Only when the actual water temperature in the outlet pipe reaches the set outlet temperature will the control circuit board switch to connect the outlet pipe and the outlet.

2. The instant hot water dispenser according to claim 1, characterized in that, The solenoid valve has one inlet and two outlets; the outlet pipe includes a first outlet pipe and a second outlet pipe. The first outlet pipe is connected between the outlet end of the heating element and the inlet of the solenoid valve. The second outlet pipe is connected between one outlet of the solenoid valve and the outlet nozzle. The other outlet of the solenoid valve is connected to the return water pipe.

3. The instant hot water dispenser according to claim 2, characterized in that, The temperature sensor is located in the second water outlet pipe.

4. The instant hot water dispenser according to claim 2, characterized in that, The solenoid valve is fixed inside the housing by a mounting bracket, and the outlet connected to the return water pipe is located below the outlet connected to the second outlet pipe.

5. The instant hot water dispenser according to claim 1, characterized in that, The end of the water inlet pipe is equipped with an inlet valve, which connects to the water tank.

6. The instant hot water dispenser according to claim 5, characterized in that, The inlet valve has a three-way structure. The inlet valve includes a first inlet port connected to the water tank, a second inlet port connected to the return water pipe, and an outlet port connected to the inlet water pipe. The second inlet port of the inlet valve is connected to the outlet port of the inlet valve.

7. The instant hot water dispenser according to claim 1, characterized in that, The heating element is installed vertically, with the water inlet end located at the bottom and the water outlet end located at the top.

8. The instant hot water dispenser according to claim 7, characterized in that, The water pump is fixed to the heating element near the water inlet end.

9. The instant hot water dispenser according to claim 1, characterized in that, The heating element is fixed to the vertical side plate of the casing by a bracket.

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