Single-heating-pipe double-water-tank constant-temperature direct drinking water system

Abstract

The utility model discloses a kind of single heating pipe's double water tank constant temperature direct drinking water system, it is related to drinking water equipment technical field, including the water purification preparation module for preparing direct drinking water, the heating water supplement module being communicated with water purification preparation module, the circulation water supply module being bidirectionally communicated with heating water supplement module and the control module being electrically connected with water purification preparation module, heating water supplement module and circulation water supply module;Heating water supplement module includes step type hot tank, double-cavity convection heat exchanger and constant temperature water tank, single heating pipe for providing heat source is built-in in step type hot tank, and constant temperature water tank is covered with heat preservation layer.The utility model breaks through the mode of existing double heating pipe respectively heating, uses single heating pipe built-in in step type hot tank, for constant temperature water tank water supplement heating and temperature compensation heating share, effectively reduce the maximum power of whole machine, reduce energy consumption, meet energy-saving requirement, especially suitable for long-term operation scene such as public security monitoring station, reduce operating cost.

Description

Technical Field

[0001] This utility model relates to the field of drinking water equipment technology, specifically to a dual-tank constant temperature direct drinking water system with a single heating tube. Background Technology

[0002] Currently, most public security detention facilities use water dispensers based on a dual-heating-tube design (such as...). Figure 1 As shown, this type of water dispenser meets drinking water needs by providing water through a multi-stage purification system, dual-tank heating, and circulating water supply. The overall system includes a water purification module, a dual-heating storage module, and a circulating water supply module. The water purification module consists of a first-stage PP cotton filter, a second-stage granular carbon filter, a third-stage compressed carbon filter, a fourth-stage RO membrane, and a fifth-stage post-carbon filter, along with an RO booster pump and a water purifier inlet solenoid valve. The dual-heating storage module includes a 45°C constant-temperature water tank with built-in heating elements and a step-type heating tank. The 45°C constant-temperature water tank is equipped with high and low level detectors and an internal UV sterilization lamp, and has an overflow port on top. The step-type heating tank is equipped with a heating tank inlet solenoid valve 1 and a heating tank check valve. The circulating water supply module consists of a 24-hour water supply pump, a delivery UV sterilizer, and a return UV sterilizer, covering multiple water usage points.

[0003] However, existing water dispensers with dual heating elements generally have technical defects, making it difficult to meet the special requirements of public security detention facilities for high safety, high stability, and energy efficiency in water equipment. Specifically:

[0004] 1. The simultaneous operation of dual heating elements (constant temperature water tank heating element + stepping hot tank heating element) results in a high total power consumption during operation, which significantly increases energy consumption costs during long-term uninterrupted operation. Furthermore, in order to control the total power consumption of the entire unit, the rated power of a single heating element needs to be reduced, thereby reducing the overall water production capacity of the unit, which does not meet the requirements of energy conservation, emission reduction and stable water supply in public security supervision sites.

[0005] 2. Because the 45℃ constant temperature water tank has a built-in heating tube, the low liquid level must be higher than the heating tube to avoid dry burning. This results in an unusable "dead space" at the bottom of the water tank, and the actual effective output volume is much smaller than the nominal volume. The water supply is limited and it is difficult to match the scenario of concentrated personnel and stable water demand in public security supervision sites.

[0006] 3. Although existing constant temperature water tanks have built-in UV sterilization lamps, they can only achieve localized preliminary sterilization and lack a secondary sterilization mechanism. If the water is stored for a long time or the UV sterilization lamps fail, bacteria can easily grow. Utility Model Content

[0007] The purpose of this invention is to provide a dual-tank constant-temperature direct drinking water system with a single heating element to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A dual-tank constant-temperature direct drinking water system with a single heating element includes a water purification preparation module for preparing direct drinking water, a heating and replenishing water module connected to the water purification preparation module, a circulating water supply module bidirectionally connected to the heating and replenishing water module, and a control module electrically connected to the water purification preparation module, the heating and replenishing water module, and the circulating water supply module.

[0010] The heating and water replenishment module includes a step-type heating tank, a dual-chamber convection heat exchanger, and a constant temperature water tank. The step-type heating tank has a built-in single heating tube for providing a heat source, and the constant temperature water tank is covered with an insulation layer. The constant temperature water tank has a built-in high liquid level detection device, a medium liquid level detection device, a low liquid level detection device, a constant temperature upper control device, and a constant temperature lower control device. The constant temperature upper control device and the constant temperature lower control device are used to detect the water temperature in the constant temperature water tank.

[0011] Preferably, one inlet of the dual-cavity convection heat exchanger is connected to the outlet of the water purification module, and one outlet is connected to the inlet of the step-type heat tank. The other inlet of the dual-cavity convection heat exchanger is connected to the outlet of the step-type heat tank, and the other outlet is connected to the inlet of the constant temperature water tank. One outlet of the constant temperature water tank is connected to the inlet of the step-type heat tank.

[0012] Preferably, the heating and water replenishment module further includes a hot tank inlet solenoid valve, a hot tank check valve, a replenishment water inlet solenoid valve, and a replenishment circulation pump;

[0013] The inlet end of the hot tank water inlet solenoid valve is connected to the dual-chamber convection heat exchanger, and the outlet end is connected to the hot tank check valve.

[0014] The inlet of the heating circulation pump is connected to the constant temperature water tank, and the outlet is connected to the heating water inlet solenoid valve. The end of the heating water inlet solenoid valve away from the heating circulation pump is connected to the hot tank check valve.

[0015] Preferably, the pipeline containing the hot water inlet solenoid valve and the pipeline containing the supplemental heating water inlet solenoid valve are merged into a main pipe, which is then connected to the pipeline containing the hot water check valve and connected to the inlet end of the step-type hot water tank.

[0016] Preferably, the circulating water supply module includes a water supply pump, a water delivery UV sterilization device, a return water UV sterilization device, and a return water filter;

[0017] The inlet of the water supply pump is connected to the constant temperature water tank, and the outlet is connected to each water point. The water supply UV sterilization device is installed on the pipeline between the water supply pump and the water point. The return water UV sterilization device and the return water filter are sequentially installed on the return water pipeline between the constant temperature water tank and the water point.

[0018] Preferably, the return water filter is located between the return water UV sterilization device and the constant temperature water tank.

[0019] Preferably, the step-type heating tank is equipped with an anti-dry-burning liquid level detection device, a step-type temperature control device, and an anti-dry-burning temperature control device. The anti-dry-burning liquid level detection device, the step-type temperature control device, and the anti-dry-burning temperature control device are respectively positioned above the heating tube, and the anti-dry-burning temperature control device is used to prevent the heating tube from dry-burning.

[0020] Preferably, the constant temperature water tank is provided with an overflow port, which is located above the water level corresponding to the high liquid level detection device.

[0021] Preferably, the water purification module includes a first-stage PP cotton, a second-stage granular carbon, a third-stage compressed carbon, a fourth-stage RO membrane, and a fifth-stage post-carbon filter connected in sequence. A water purifier inlet solenoid valve and an RO booster pump are sequentially installed on the pipeline between the third-stage compressed carbon and the fourth-stage RO membrane, and a check valve is installed on the pipeline between the fourth-stage RO membrane and the fifth-stage post-carbon filter. The check valve is a one-way valve.

[0022] Preferably, the water purification module further includes a pressure storage tank, and the pressure storage tank is equipped with a pressure detection device.

[0023] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0024] 1. This utility model breaks through the existing dual heating tube separate heating mode and adopts a step-type hot water tank with a built-in single heating tube, which is used for both water replenishment heating and temperature replenishment heating of the constant temperature water tank. This effectively reduces the maximum power of the whole machine, reduces energy consumption, meets energy-saving requirements, and is especially suitable for long-term operation scenarios such as public security detention centers, thereby reducing operating costs.

[0025] 2. This utility model eliminates the space occupied by heating pipes inside the constant temperature water tank, enabling 100% utilization of the effective volume of the constant temperature water tank and effectively increasing the actual water supply.

[0026] 3. This utility model, through a secondary heating mechanism in the supplementary heating mode, combined with a water supply UV sterilization device, a return water UV sterilization device, and a return water filter, forms a multi-layered water quality protection system, effectively inhibiting bacterial growth, solving the problem of insufficient sterilization capacity in existing technologies, and meeting the high standards of drinking water safety requirements of public security detention centers.

[0027] 4. This utility model avoids malfunctions such as dry burning and overflow by dual detection of liquid level and temperature and priority control of operating conditions (water replenishment takes precedence over heat preservation), ensuring stable operation of the equipment 24 hours a day and reducing maintenance costs and downtime risks. Attached Figure Description

[0028] Figure 1 A schematic diagram of an existing direct drinking water system;

[0029] Figure 2 This is a schematic diagram of the framework of this utility model;

[0030] Figure 3 This is a schematic diagram of the circuit connection of this utility model.

[0031] In the diagram: 1. Water purification module; 11. First-stage PP cotton; 12. Second-stage granular carbon; 13. Third-stage compressed carbon; 14. Fourth-stage RO membrane; 15. Fifth-stage post-carbon; 16. Water purifier inlet solenoid valve; 17. RO booster pump; 18. Pressure storage tank; 19. Check valve;

[0032] 2. Heating and water replenishment module; 21. Stepping water tank; 22. Dual-chamber convection heat exchanger; 23. Constant temperature water tank; 24. Heating element; 25. High liquid level detection device; 26. Medium liquid level detection device; 27. Low liquid level detection device; 28. Anti-dry burning temperature control device; 29. ​​Constant temperature upper control device; 210. Constant temperature lower control device;

[0033] 3. Circulating water supply module; 31. Water supply pump; 32. Water delivery UV sterilization device; 33. Return water UV sterilization device; 34. Return water filter;

[0034] 4. Hot water inlet solenoid valve; 5. Hot water check valve; 6. Heat replenishment inlet solenoid valve; 7. Heat replenishment circulation pump; 8. Anti-dry burning liquid level detection device; 9. Stepping temperature control device; 10. Overflow port; 100. Control module. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to embodiments:

[0036] like Figures 2-3 As shown, this utility model provides a dual-tank constant temperature direct drinking water system with a single heating tube, including a water purification preparation module 1 for preparing direct drinking water, a heating and replenishing water module 2 connected to the water purification preparation module 1, a circulating water supply module 3 bidirectionally connected to the heating and replenishing water module 2, and a control module 100 electrically connected to the water purification preparation module 1, the heating and replenishing water module 2 and the circulating water supply module 3.

[0037] The heating and water replenishment module 2 includes a step-type heating tank 21, a dual-chamber convection heat exchanger 22, and a constant temperature water tank 23. The step-type heating tank 21 has a single heating tube 24 built in for providing a heat source, which is used to heat the water source in the step-type heating tank 21. The constant temperature water tank 23 is covered with an insulation layer. The constant temperature water tank 23 has a high liquid level detection device 25, a medium liquid level detection device 26, a low liquid level detection device 27, a constant temperature upper temperature control device 29, and a constant temperature lower temperature control device 210 built in. The constant temperature upper temperature control device 29 and the constant temperature lower temperature control device 210 are used to detect the water temperature in the constant temperature water tank 23, respectively.

[0038] One inlet of the dual-cavity convection heat exchanger 22 is connected to the outlet of the water purification module 1, and the other outlet is connected to the inlet of the stepping heat tank 21. The other inlet of the dual-cavity convection heat exchanger 22 is connected to the outlet of the stepping heat tank 21, and the other outlet is connected to the inlet of the constant temperature water tank 23. One outlet of the constant temperature water tank 23 is connected to the inlet of the stepping heat tank 21.

[0039] Furthermore, the heating and water replenishment module 2 also includes a hot tank inlet solenoid valve 4, a hot tank check valve 5, a replenishment water inlet solenoid valve 6, and a replenishment circulation pump 7;

[0040] The inlet end of the hot tank water inlet solenoid valve 4 is connected to the dual-chamber convection heat exchanger 22, and the outlet end is connected to the hot tank check valve 5.

[0041] The inlet of the heating circulation pump 7 is connected to the constant temperature water tank 23, and the outlet is connected to the heating inlet solenoid valve 6. The end of the heating inlet solenoid valve 6 away from the heating circulation pump 7 is connected to the hot tank check valve 5.

[0042] Furthermore, through the design of the hot water tank inlet solenoid valve 4, the hot water tank check valve 5, the replenishing water inlet solenoid valve 6, and the replenishing circulation pump 7, the water temperature in the constant temperature water tank 23 can be replenished through the cooperation of the replenishing water inlet solenoid valve 6 and the replenishing circulation pump 7 after it drops. This allows for rapid replenishment of water temperature by boiling it twice and then cooling it down (i.e., through the dual-chamber convection heat exchanger 22). This also enables the step-type hot water tank 21 and the constant temperature water tank 23 to share a single heating tube 24, which can effectively reduce the overall power consumption of the unit and reduce energy costs.

[0043] Specifically, when the water temperature in the constant temperature water tank 23 drops to the set value (e.g., 40℃), the anti-dry-burning detection is performed first, then the hot water inlet solenoid valve 4 is closed, the replenishment water inlet solenoid valve 6 is started, and the replenishment circulation pump 7 is started simultaneously to perform step heating. It should be noted here that the water replenishment action of the constant temperature water tank 23 takes precedence over the heat preservation action.

[0044] More specifically, water replenishment to the constant temperature water tank 23 takes priority over heat preservation. When the liquid level in the constant temperature water tank 23 is lower than the medium liquid level detection device 26, the water replenishment action is initiated; it first performs anti-dry burning detection, then performs step-by-step heating, until the high liquid level detection device 25 detects a signal and stops the step-by-step heating.

[0045] It is worth noting that this solution aims to protect the physical structure, but does not provide protection for the circuitry and program control. The description of the processing circuitry and program control in this paper is merely a supplementary explanation of the feasibility and authenticity of this utility model. This utility model does not seek protection for the program control and circuitry technology. Furthermore, it is worth emphasizing that although this solution does not elaborate on the electronic control program, those skilled in the art can understand and apply it based on their professional knowledge.

[0046] In summary, this utility model breaks through the existing dual-heating-tube separate heating mode, and adopts a step-type heating tank 21 with a single heating tube 24 built in, which is used for both water replenishment heating and temperature replenishment heating of the 45℃ constant temperature water tank 23, effectively reducing the maximum power of the whole machine and solving the problem of high power consumption. Among them, the constant temperature water tank 23 is a 45℃ constant temperature water tank. The specific reason is that when the 100℃ boiling water in the step-type heating tank 21 passes through the dual-cavity convection heat exchanger 22, the 100℃ boiling water can undergo counter-current heat exchange with the other inlet water through one channel of the heat exchanger, thereby generating 45℃ cooled boiled water, which is then sent to the 45℃ constant temperature water tank.

[0047] Furthermore, the pipeline containing the hot water inlet solenoid valve 4 and the pipeline containing the supplementary heating water inlet solenoid valve 6 merge into a main pipe, which is then connected to the pipeline containing the hot water inlet check valve 5 and connected to the water inlet of the step-type hot water tank 21. The hot water inlet solenoid valve 4 is mainly used to control the regular water inlet path of approximately 65℃ drinking water to the step-type hot water tank 21. The supplementary heating water inlet solenoid valve 6, under specific operating conditions such as supplementary heating, coordinates to control the water flow. The hot water inlet check valve 5 prevents backflow of water, ensuring the water system operates stably in the set direction.

[0048] Furthermore, the circulating water supply module 3 includes a water supply pump 31, a water delivery UV sterilization device 32, a return water UV sterilization device 33, and a return water filter 34;

[0049] The inlet of the water supply pump 31 is connected to the constant temperature water tank 23, and the outlet is connected to each water point. The water supply UV sterilization device 32 is installed on the pipeline between the water supply pump 31 and the water point. The return water UV sterilization device 33 and the return water filter 34 are sequentially installed on the return water pipeline between the constant temperature water tank 23 and the water point.

[0050] Furthermore, water pump 31 is used for 24-hour circulating water supply, wherein:

[0051] When the low liquid level detection device 27 in the constant temperature water tank 23 detects that there is water at a low liquid level in the constant temperature water tank 23, the water supply pump 31 is started to perform a 24-hour circulating water supply operation. When the 24-hour circulating water supply pump 31 is started, the water delivery UV sterilization device 32 and the return water UV sterilization device 33 are also started accordingly.

[0052] When the low liquid level detection device 27 in the constant temperature water tank 23 detects that the constant temperature water tank 23 has no water at a low liquid level, the water supply pump 31 is shut off; and the water supply UV sterilization device 32 and the return water UV sterilization device 33 are shut off accordingly.

[0053] Furthermore, the return water filter 34 is located between the return water UV sterilization device 33 and the constant temperature water tank 23. The return water filter 34 can filter the return water to intercept impurities and prevent them from entering the constant temperature water tank 23, thus avoiding contamination of the inside of the constant temperature water tank 23. It can also prevent impurities from entering other components, reducing wear on internal parts of the equipment and extending the service life of the equipment. In addition, it can reduce the turbidity of the return water, making the water quality purer and ensuring that the water flowing back to the constant temperature water tank 23 remains clean and does not contaminate the water stored in the tank, thus ensuring the water quality safety of the entire water circulation system.

[0054] Furthermore, this utility model utilizes a supplementary heating mode consisting of a supplementary heating solenoid valve 6 and a supplementary heating circulation pump 7 to enable the water in the constant temperature water tank 23 to achieve effective sterilization through a secondary heating mechanism. Combined with existing UV sterilization technology, this is beneficial for ensuring water quality.

[0055] Furthermore, the step-type heating tank 21 is equipped with an anti-dry-burning liquid level detection device 8, a step-type temperature control device 9, and an anti-dry-burning temperature control device 28. The anti-dry-burning liquid level detection device 8, the step-type temperature control device 9, and the anti-dry-burning temperature control device 28 are respectively positioned higher than the heating tube 24. The anti-dry-burning temperature control device 28 is used to prevent the heating tube 24 from dry-burning. The anti-dry-burning temperature control device 28 is installed near the heating tube 24, and its purpose is to monitor the temperature status of the heating tube 24 during operation.

[0056] Specifically, the anti-dry-burning liquid level detection device 8, the stepping temperature control device 9, the anti-dry-burning temperature control device 28, and the heating element 24 are all electrically connected to the control device 100. It is worth noting that this solution aims to protect the physical structure, not the circuitry and program control. The description of the processing circuitry and program control in this paper is merely a supplementary explanation of the feasibility and authenticity of this utility model; this utility model does not seek protection for the program control and circuitry technology. Furthermore, it is worth emphasizing that although the electronic control program is not described in detail in this solution, those skilled in the art can understand and apply it based on their professional knowledge.

[0057] Furthermore, the constant temperature water tank 23 is provided with an overflow port 10, which is located above the water level corresponding to the high liquid level detection device 25.

[0058] Furthermore, the water purification module 1 includes a first-stage PP cotton 11, a second-stage granular carbon 12, a third-stage compressed carbon 13, a fourth-stage RO membrane 14, and a fifth-stage post-carbon 15 connected in sequence. A water purifier inlet solenoid valve 16 and an RO booster pump 17 are sequentially installed on the pipeline between the third-stage compressed carbon 13 and the fourth-stage RO membrane 14. A check valve 19 is installed on the pipeline between the fourth-stage RO membrane 14 and the fifth-stage post-carbon 15. The check valve 19 is a one-way valve. The water purification module 1 also includes a pressure storage tank 18, which is equipped with a pressure detection device, such as a low-pressure protection switch and a high-pressure protection switch.

[0059] The operation process of water purification module 1 is as follows:

[0060] Start-up: Provided that the tap water pressure meets the standard and the pressure in the pressure storage tank 18 is lower than the set lower limit, the water purification module 1 starts the water production process.

[0061] Stop: When the pressure in the pressure storage tank 18 reaches the upper limit of the set value, the water purification module 1 stops the water production process.

[0062] As water is continuously used, the pressure in the pressure tank 18 will decrease. When the pressure in the pressure tank 18 is lower than the set value, the machine will restart... This cycle of stopping and starting repeats itself.

[0063] It is worth noting that the operation of the water purification module 1 is a conventional technology and a common application in the field, and is well known to those skilled in the art. Therefore, the functions of the first-stage PP cotton 11, the second-stage granular carbon 12, the third-stage compressed carbon 13, the fourth-stage RO membrane 14, and the fifth-stage post-carbon 15 will not be described in detail in this article.

[0064] like Figures 2-3 As shown, the working principle of this single-heating-tube dual-tank constant temperature direct drinking water system will be explained in detail below.

[0065] The water purification module 1 is used to provide clean drinking water to the step-type hot water tank 21, and automatically starts and stops water production according to the pressure of the pressure storage tank 18.

[0066] The operation of heating and water replenishment module 2 is as follows:

[0067] Step-type heating tank 21 anti-dry burning:

[0068] When the anti-dry-burning liquid level detection device 8 in the step-type heating tank 21 fails to detect the water level, the anti-dry-burning protection mechanism is activated, and the heating tank water inlet solenoid valve 4 is opened to replenish water into the step-type heating tank 21 until the anti-dry-burning liquid level detection device 8 detects the water level, thus preventing the heating tube from being damaged by dry burning.

[0069] Step-by-step hydration:

[0070] Open the 4-way step-type hot water inlet solenoid valve of the hot water tank 21 to introduce a certain amount of drinking water, then close it. This is generally achieved using an adjustable duration of 1-30 seconds.

[0071] Step-type hot water tank with step-by-step heating:

[0072] When the step-by-step hot water tank 21 passes the anti-dry-burning test, the step-by-step water replenishment action is initiated.

[0073] Meanwhile, if the stepping temperature control device 9 does not detect the set high temperature (such as 95°C), it will continuously power the heating element.

[0074] If the step temperature control device 9 has detected the set medium temperature (e.g., 92℃) during this period, the step water replenishment action will be restarted again >>> water temperature drops → water temperature reaches a low temperature value (e.g., 88℃) and water replenishment stops → water temperature reaches the medium temperature again → step water replenishment is restarted again... This step water replenishment action is repeated, and the water level rises.

[0075] Boiling water is pushed into the dual-cavity convection heat exchanger 22 and undergoes countercurrent heat exchange with the other inlet water of the dual-cavity convection heat exchanger 22, thereby generating 45°C cooled boiled water and sending it into the constant temperature water tank 23.

[0076] When the high liquid level detection device 25 of the constant temperature water tank 23 detects the signal, the step-by-step water replenishment is closed (i.e., the hot water tank inlet solenoid valve 4 is shut down).

[0077] When the stepping temperature control device 9 detects that the stepping hot tank 21 has reached the set high temperature (such as 95°C), the heating tube 24 is de-energized.

[0078] Thermostatic water tank 23 water replenishment:

[0079] When the liquid level in the constant temperature water tank 23 is lower than the middle liquid level, the water replenishment action is initiated; first, the step-by-step hot tank 21 anti-dry burning detection is performed, and then the step-by-step heating is performed; until the high liquid level detection device 25 detects a signal and stops the step-by-step heating.

[0080] Thermostatic water tank 23 insulation:

[0081] When the temperature of the constant temperature water tank 23 drops to the set value (e.g., 40℃) and there is water in the liquid level, the step-by-step heating tank 21 is first activated to prevent dry burning, then the heating tank inlet solenoid valve 4 is closed, the replenishing water inlet solenoid valve 6 is activated, and the replenishing circulation pump 7 is activated to execute the step-by-step heating mode of the step-by-step heating tank 21; causing the water stored in the constant temperature water tank 23 to be sent into the step-by-step heating tank 21 and heated to 100℃, and after being cooled by the dual-chamber convection heat exchanger 22, it is sent back to the constant temperature water tank 23 to achieve replenishing temperature and secondary sterilization.

[0082] 24-hour circulating water supply:

[0083] When the constant temperature water tank 23 has water at a low level, the water supply pump 31, the water delivery UV sterilization device 32, and the return water UV sterilization device 33 are started.

[0084] When the constant temperature water tank 23 has no water at the low liquid level, the circulating water supply system will be shut off.

[0085] In summary, it is worth noting that this solution aims to protect the physical structure, but does not provide protection for the circuitry and program control. The description of the processing circuitry and program control in this paper is merely a supplementary explanation of the feasibility and authenticity of this utility model, and this utility model does not seek protection for the program control and circuitry technology. Furthermore, it is important to emphasize that although this solution does not elaborate on the electronic control program, those skilled in the art can readily understand and apply it based on their professional knowledge.

[0086] It should be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0087] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A dual-tank constant-temperature direct drinking water system with a single heating element, characterized in that: It includes a water purification preparation module for preparing direct drinking water, a heating and water replenishment module connected to the water purification preparation module, a circulating water supply module bidirectionally connected to the heating and water replenishment module, and a control module electrically connected to the water purification preparation module, the heating and water replenishment module, and the circulating water supply module. The heating and water replenishment module includes a step-type heating tank, a dual-chamber convection heat exchanger, and a constant temperature water tank. The step-type heating tank has a built-in single heating tube for providing a heat source, and the constant temperature water tank is covered with an insulation layer. The constant temperature water tank has a built-in high liquid level detection device, a medium liquid level detection device, a low liquid level detection device, a constant temperature upper control device, and a constant temperature lower control device. The constant temperature upper control device and the constant temperature lower control device are used to detect the water temperature in the constant temperature water tank.

2. The single-heating-tube dual-tank constant-temperature direct drinking water system according to claim 1, characterized in that: One inlet of the dual-cavity convection heat exchanger is connected to the outlet of the water purification module, and the other outlet is connected to the inlet of the step-type heat tank. The other inlet of the dual-cavity convection heat exchanger is connected to the outlet of the step-type heat tank, and the other outlet is connected to the inlet of the constant temperature water tank. One outlet of the constant temperature water tank is connected to the inlet of the step-type heat tank.

3. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 2, characterized in that: The heating and water replenishment module also includes a hot tank inlet solenoid valve, a hot tank check valve, a replenishment water inlet solenoid valve, and a replenishment circulation pump. The inlet end of the hot tank water inlet solenoid valve is connected to the dual-chamber convection heat exchanger, and the outlet end is connected to the hot tank check valve. The inlet of the heating circulation pump is connected to the constant temperature water tank, and the outlet is connected to the heating water inlet solenoid valve. The end of the heating water inlet solenoid valve away from the heating circulation pump is connected to the hot tank check valve.

4. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 3, characterized in that: The pipeline containing the hot water inlet solenoid valve and the pipeline containing the supplemental heating water inlet solenoid valve are merged into a main pipe, which is then connected to the pipeline containing the hot water check valve and connected to the inlet end of the step-type hot water tank.

5. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 1, characterized in that: The circulating water supply module includes a water supply pump, a water delivery UV sterilization device, a return water UV sterilization device, and a return water filter. The inlet of the water supply pump is connected to the constant temperature water tank, and the outlet is connected to each water point. The water supply UV sterilization device is installed on the pipeline between the water supply pump and the water point. The return water UV sterilization device and the return water filter are sequentially installed on the return water pipeline between the constant temperature water tank and the water point.

6. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 5, characterized in that: The return water filter is located between the return water UV sterilization device and the constant temperature water tank.

7. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 1, characterized in that: The step-type heating tank is equipped with an anti-dry-burning liquid level detection device, a step-type temperature control device, and an anti-dry-burning temperature control device. The anti-dry-burning liquid level detection device, the step-type temperature control device, and the anti-dry-burning temperature control device are respectively positioned above the heating tube, and the anti-dry-burning temperature control device is used to prevent the heating tube from dry-burning.

8. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 1, characterized in that: The constant temperature water tank is equipped with an overflow port, which is located above the water level corresponding to the high liquid level detection device.

9. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 1, characterized in that: The water purification module includes a first-stage PP cotton, a second-stage granular carbon, a third-stage compressed carbon, a fourth-stage RO membrane, and a fifth-stage post-carbon filter connected in sequence. A water purifier inlet solenoid valve and an RO booster pump are sequentially installed on the pipeline between the third-stage compressed carbon and the fourth-stage RO membrane. A check valve is installed on the pipeline between the fourth-stage RO membrane and the fifth-stage post-carbon filter. The check valve is a one-way valve.

10. A dual-tank constant-temperature direct drinking water system with a single heating element according to claim 9, characterized in that: The water purification module also includes a pressure storage tank, which is equipped with a pressure detection device.

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