Multi-temperature exchanger and electric water boiler water dispenser

Abstract

The utility model provides a kind of multi-temperature exchanger and electric hot water boiler drinking fountain, and multi-temperature exchanger includes: heat exchange inner tube, heat exchange outer tube, clean water inlet pipe, boiling water pipe, water tank inlet pipe and multi-temperature outlet water component;Multi-temperature outlet water component includes hot and cold water tee pipe and temperature regulating faucet.Relative to prior art, the utility model's multi-temperature exchanger is to cool the drinking water boiled, and the normal temperature boiling water after cooling is more sanitary and safe.Cooling normal temperature boiling water is mixed with boiling water again, so that the temperature of outlet water can be adjusted, and the drinking needs of different temperatures are met.In addition, larger diameter and longer corrugated stainless steel pipe design can be used to enhance the efficiency of heat exchange, the water temperature entering the water tank is high, and the heating time is saved.The large-diameter corrugated stainless steel pipe has large flux, and the natural pressure of the water tank can also provide sufficient water without special design structure or additional water pump, which is more safe and energy-saving, and reduces the failure rate.

Description

Technical Field

[0001] This utility model relates to the field of drinking water technology, specifically to a multi-temperature exchanger and an electric water heater / drinker. Background Technology

[0002] Currently, water dispensers and commercial water heaters generally use a mixture of hot and filtered water to achieve the desired temperature for various water supply needs. However, the filtered water is not heated to boiling, which can lead to incomplete elimination of viruses and bacteria, posing a safety and hygiene risk. Existing heat exchangers are also inadequate for cooling large volumes of water, requiring long waiting times for the hot water temperature to drop. Market feedback indicates that in many school water dispensers, insufficient water supply often occurs when students are filling up at the same time, and the water temperature can easily become too high after prolonged use. Some water dispensers and water heaters use a sealed tank to heat water and create pressure before supplying it via an exchanger or pump. This can easily result in excessively fast water flow and low heat exchange efficiency, leading to overheated outlet water. Furthermore, the water entering the tank is relatively cold, resulting in a longer heating time. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings and deficiencies in the existing technology and to provide a multi-temperature exchanger and an electric water heater / drinker.

[0004] One embodiment of this utility model provides a multi-temperature exchanger, including: an inner heat exchange tube, an outer heat exchange tube, a clean water inlet pipe, a hot water pipe, a water tank inlet pipe, and a multi-temperature water outlet assembly;

[0005] The inner heat exchange tube is inserted inside the outer heat exchange tube, and a heat exchange channel is formed inside the inner heat exchange tube. A clean water channel is formed between the outer side of the inner heat exchange tube and the inner side of the outer heat exchange tube.

[0006] The purified water inlet pipe is connected to the inlet end of the purified water channel;

[0007] The hot water pipe is connected to the inlet end of the heat exchange channel, and a hot water shut-off valve is installed on the hot water pipe.

[0008] The water tank inlet pipe is connected to the water outlet of the water purification channel;

[0009] The multi-temperature water outlet assembly includes a hot and cold water tee and a temperature-adjustable faucet. The hot and cold water tee includes a cold water pipe, a hot water pipe, and a mixing pipe. The cold water pipe and the hot water pipe are both connected to the mixing pipe. The cold water pipe is connected to the outlet end of the heat exchange channel. The hot water pipe is connected to the hot water pipe or the heat exchange channel. The mixing pipe is connected to the temperature-adjustable faucet.

[0010] In some optional embodiments, a hot water proportional valve is provided at the hot water pipe, and a temperature sensor is provided at the mixing pipe, the temperature sensor being signal-connected to the hot water proportional valve.

[0011] In some alternative implementations, the cold water pipe and the hot water pipe are connected to the mixing pipe via a manual regulating valve.

[0012] In some optional embodiments, the multi-temperature water outlet assembly further includes a preset temperature water outlet pipe and a preset temperature faucet. A first water outlet and a second water outlet are provided in the heat exchange channel. The first water outlet and the second water outlet are located between the water inlet end and the water outlet end of the heat exchange channel. The first water outlet and the second water outlet are arranged sequentially from the water inlet end to the water outlet end of the heat exchange channel. The preset temperature water outlet pipe is connected to the first water outlet and the preset temperature faucet, respectively. The hot water pipe is connected to the second water outlet.

[0013] In some optional embodiments, the multi-temperature water outlet assembly further includes multiple preset temperature water outlet pipes and multiple preset temperature water taps. Multiple first water outlets are provided in the heat exchange channel. The multiple first water outlets are arranged sequentially from the water inlet end of the heat exchange channel to the water outlet end of the heat exchange channel. The preset temperature water outlet pipes are respectively connected to the first water outlets and the preset temperature water taps.

[0014] In some alternative implementations, the plurality of preset temperature faucets are respectively 80°C faucets and 60°C faucets.

[0015] In some alternative embodiments, both the inner heat exchange tube and the outer heat exchange tube are corrugated stainless steel tubes.

[0016] In some optional embodiments, the multi-temperature exchanger further includes a first tee fitting, which has a first channel and a second channel that are not interconnected. The purified water inlet pipe is connected to the first end of the first tee fitting, the cold water pipe is connected to the second end of the first tee fitting, the heat exchange outer pipe and the heat exchange inner pipe are both connected to the third end of the first tee fitting, the purified water inlet pipe is connected to the purified water channel through the first channel, and the cold water pipe is connected to the heat exchange channel through the second channel.

[0017] In some optional embodiments, the multi-temperature exchanger further includes a second tee fitting, which has a third and a fourth channel that are not interconnected. The hot water pipe is connected to the first end of the second tee fitting, the water tank inlet pipe is connected to the second end of the second tee fitting, the heat exchange outer pipe and the heat exchange inner pipe are both connected to the third end of the second tee fitting, the hot water pipe is connected to the heat exchange channel through the third channel, and the water tank inlet pipe is connected to the clean water channel through the fourth channel.

[0018] In some alternative embodiments, the hot water pipe includes a hot water pipe and a hot water shut-off valve disposed at the hot water pipe, and the hot water pipe is connected to the heat exchange channel.

[0019] Another embodiment of this utility model provides an electric water heater / drinker, comprising: a multi-temperature exchanger as described above.

[0020] Compared to existing technologies, this multi-temperature exchanger cools boiled drinking water to room temperature, making the cooled water safer and more hygienic. The cooled water is then mixed with boiling water, allowing for adjustable water temperature to meet different drinking needs. Furthermore, the use of larger diameter and longer corrugated stainless steel pipes enhances heat exchange efficiency, resulting in higher water temperatures entering the tank and reducing heating time. The large-diameter corrugated stainless steel pipes provide high flow capacity, and the natural pressure of the tank is sufficient for water supply, eliminating the need for special structural designs or additional pumps, thus improving safety, energy efficiency, and reducing the failure rate.

[0021] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the multi-temperature exchanger according to the first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the multi-temperature exchanger and water tank according to the first embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of one side of the multi-temperature exchanger according to the first embodiment of the present invention;

[0025] Figure 4 for Figure 3 The sectional view shown at section line A;

[0026] Figure 5 This is a schematic diagram of the water circuit of the multi-temperature exchanger according to the first embodiment of this utility model;

[0027] Figure 6 for Figure 4 The enlarged view at point A is shown below;

[0028] Figure 7 This is a cross-sectional view of a portion of the structure of the multi-temperature exchanger at the first tee fitting according to the first embodiment of this utility model.

[0029] Figure 8 This is a cross-sectional view of a portion of the structure of the multi-temperature exchanger at the second tee fitting in the first embodiment of this utility model.

[0030] Figure 9 This is a schematic diagram of the structure of the multi-temperature exchanger according to the second embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of the multi-temperature exchanger according to the third embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Inner heat exchange tube; 11. Heat exchange channel; 12. First water outlet; 13. Second water outlet; 20. Outer heat exchange tube; 21. Clean water channel; 30. Clean water inlet pipe; 40. Hot water pipe; 41. Hot water shut-off valve; 50. Water tank inlet pipe; 60. Multi-temperature water outlet assembly; 61. Hot and cold water tee pipe; 611. Cold water pipe; 612. Hot water pipe; 613. Mixing pipe; 614. Hot water proportioning valve; 61 5. Temperature sensor; 616. Manual regulating valve; 62. Temperature-adjustable faucet; 63. Preset temperature water outlet pipe; 64. Preset temperature faucet; 641. 80℃ faucet; 642. 60℃ faucet; 65. First tee fitting; 651. First channel; 652. Second channel; 66. Second tee fitting; 661. Third channel; 662. Fourth channel; 70. Water tank; 71. Hot water faucet. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0035] First embodiment:

[0036] Please see Figures 1 to 6 The first embodiment of this utility model provides a multi-temperature exchanger, including: an inner heat exchange tube 10, an outer heat exchange tube 20, a clean water inlet pipe 30, a hot water pipe 40, a water tank 70 inlet pipe 50, and a multi-temperature water outlet assembly 60.

[0037] The heat exchange inner tube 10 is inserted into the heat exchange outer tube 20, and a heat exchange channel 11 is formed inside the heat exchange inner tube 10. A clean water channel 21 is formed between the outer side of the heat exchange inner tube 10 and the inner side of the heat exchange outer tube 20.

[0038] The water inlet pipe 30 is connected to the water inlet end of the water purification channel 21;

[0039] The hot water pipe 40 is connected to the inlet end of the heat exchange channel 11, and a hot water shut-off valve 41 is installed on the hot water pipe 40.

[0040] The water inlet pipe 50 of the water tank 70 is connected to the water outlet of the water purification channel 21;

[0041] The multi-temperature water outlet assembly 60 includes a hot and cold water tee pipe 61 and a temperature-adjustable faucet 62. The hot and cold water tee pipe 61 includes a cold water pipe 611, a hot water pipe 612, and a mixing pipe 613. Both the cold water pipe 611 and the hot water pipe 612 are connected to the mixing pipe 613. The cold water pipe 611 is connected to the outlet end of the heat exchange channel 11, the hot water pipe 612 is connected to the hot water pipe 40 or the heat exchange channel 11, and the mixing pipe 613 is connected to the temperature-adjustable faucet 62. In this embodiment, the hot water pipe 612 is also connected to the heat exchange channel 11, but the connection position is closer to the inlet end of the heat exchange channel 11 than that of the cold water pipe 611.

[0042] The working principle of the multi-temperature exchanger of this utility model is explained below:

[0043] The water inlet pipe 30 is connected to the water purifier. The water inlet pipe 50 and the hot water pipe 40 of the water tank 70 are both connected to the water tank 70. The water tank 70 is higher than the multi-temperature water outlet component 60, so that the natural pressure of the water tank 70 can drive the water to flow out from the temperature-adjusting faucet 62 of the multi-temperature water outlet component 60.

[0044] Room temperature purified water from the water purifier enters the purified water inlet pipe 30, then passes through the purified water channel 21 and the water tank 70 before entering the water tank 70. The purified water is heated in the water tank 70, causing it to boil.

[0045] When water at a suitable drinking temperature is needed, boiling water flows out from the boiling water pipe 40. The boiling water is divided into a first part and a second part. The first part of the boiling water enters the hot water pipe 612, while the second part of the boiling water passes sequentially through the heat exchange channel 11 and the cold water pipe 611, then mixes with the first part of the boiling water in the mixing pipe 613, and finally flows out from the temperature-adjusting faucet 62. When the second part of the boiling water passes through the heat exchange channel 11, it exchanges heat with the room-temperature purified water in the purified water channel 21. Therefore, when the second part of the boiling water reaches the cold water pipe 611, it will cool down to room-temperature boiling water. Thus, after mixing with the first part of the boiling water in the mixing pipe 613, the first part of the boiling water will raise the room-temperature boiling water to the corresponding temperature, which is determined based on the ratio of the first and second parts of the boiling water. Since the water flowing from the temperature-adjusting faucet 62 is water that has been heated to boiling and sterilized, it is relatively safe and hygienic.

[0046] Since the purified water at room temperature will be heated by heat exchange when it passes through the purified water channel 21, the temperature of the purified water entering the water tank 70 will be higher than room temperature. This is beneficial for quickly heating the purified water to boiling, improving heating efficiency and shortening heating time.

[0047] In addition, the lengths of the inner heat exchange tube 10 and the outer heat exchange tube 20 can be increased as needed to extend the heat exchange time. This is beneficial for fully cooling the second batch of boiling water, thus ensuring that the outlet water temperature does not become too hot during long-term water supply. It is also beneficial for fully preheating the purified water at room temperature, so that the purified water entering the water tank 70 has a higher temperature and boils faster, thereby shortening the heating time.

[0048] In some optional embodiments, both the inner heat exchanger tube 10 and the outer heat exchanger tube 20 are corrugated stainless steel tubes. Corrugated stainless steel tubes are flexible, pressure-resistant fittings that can be bent and installed freely according to the requirements of the operating environment to adapt to various machine models and types. This makes it easier to increase the length of the inner heat exchanger tube 10 and the outer heat exchanger tube 20, and also facilitates the selection of inner heat exchanger tubes 10 and 20 with larger diameters. In this embodiment, the length of the inner heat exchanger tube 10 and the outer heat exchanger tube 20 is 3 meters, with the inner heat exchanger tube 10 using 4-point (0.4 inch) pipe and the outer heat exchanger tube 20 using 1-inch (0.1 inch) pipe.

[0049] Since the path of boiling water through the heat exchange channel 11 is linked to the decrease in temperature of the boiling water, the temperature of the boiling water can be roughly determined after it travels a certain path from the inlet end of the heat exchange channel 11. In order to facilitate the flow of water at a specific temperature, in some optional embodiments, the multi-temperature water outlet assembly 60 also includes a preset temperature water outlet pipe 63 and a preset temperature faucet 64. The heat exchange channel 11 is provided with a first water outlet 12 and a second water outlet 13. The first water outlet 12 and the second water outlet 13 are located between the inlet end and the outlet end of the heat exchange channel 11. The first water outlet 12 and the second water outlet 13 are arranged sequentially from the inlet end to the outlet end of the heat exchange channel 11. The preset temperature water outlet pipe 63 is connected to the first water outlet 12 and the preset temperature faucet 64 respectively, and the hot water pipe 612 is connected to the second water outlet 13. The distance between the first water outlet 12 and the inlet of the heat exchange channel 11 is fixed. Therefore, the temperature of the boiling water when it reaches the first water outlet 12 can be roughly determined. Thus, the boiling water at a specific temperature flowing out of the first water outlet 12 can flow out from the preset temperature faucet 64 after passing through the preset temperature water outlet pipe 63, making it convenient for users to directly obtain boiling water at a specific temperature. The specific temperature can be 80℃ hot water suitable for brewing green tea, 60℃ water suitable for brewing flower tea, or 40℃ warm water suitable for making milk powder, etc., and is not limited to this example. To obtain a specific temperature, simply design the first outlet 12 in a suitable location. For example, if 80℃ hot water is required, the first outlet 12 should be located 80cm from the inlet of the heat exchange channel 11. If 60℃ hot water is required, the first outlet 12 should be located 160cm from the inlet of the heat exchange channel 11. If 40℃ hot water is required, the first outlet 12 should be located 240cm from the inlet of the heat exchange channel 11. Of course, the relationship between the distance between the first outlet 12 and the inlet of the heat exchange channel 11 and the temperature is not limited to the above examples. Based on the diameter of the heat exchange channel 11 and the heat exchange area between the heat exchange channel 11 and the purified water channel 21, the relationship between the distance between the first outlet 12 and the inlet of the heat exchange channel 11 and the temperature will also change.

[0050] To provide more specific temperature options for user convenience, in some optional embodiments, the multi-temperature water outlet assembly 60 further includes multiple preset temperature water outlet pipes 63 and multiple preset temperature water taps 64. Multiple first water outlets 12 are provided within the heat exchange channel 11, arranged sequentially from the inlet end to the outlet end of the heat exchange channel 11. The preset temperature water outlet pipes 63 are respectively connected to the first water outlets 12 and the preset temperature water taps 64. In one embodiment, taking two preset temperature water outlet pipes 63 and two preset temperature water taps 64 (an 80°C tap 641 and a 60°C tap 642) as an example, the first water outlet 12 corresponding to the 80°C tap 641 is closer to the inlet end of the heat exchange channel 11, while the first water outlet 12 corresponding to the 60°C tap 642 is closer to the second water outlet 13.

[0051] It should be noted that the boiling water enters the heat exchange channel 11 directly after the boiling water pipe 40, and is divided into the first part and the second part of boiling water after reaching the second outlet 13. The first part of boiling water enters the hot water pipe 612, while the second part of boiling water continues to move along the heat exchange channel 11 to the outlet end of the heat exchange channel 11, and then enters the cold water pipe 611.

[0052] Please see Figure 7 In some optional embodiments, the multi-temperature exchanger further includes a first tee fitting 65, which has a first channel 651 and a second channel 652 that are not interconnected. The clean water inlet pipe 30 is connected to the first end of the first tee fitting 65, the cold water pipe 611 is connected to the second end of the first tee fitting 65, the heat exchange outer pipe 20 and the heat exchange inner pipe 10 are both connected to the third end of the first tee fitting 65, the clean water inlet pipe 30 is connected to the clean water channel 21 through the first channel 651, and the cold water pipe 611 is connected to the heat exchange channel 11 through the second channel 652.

[0053] Please see Figure 8 In some optional embodiments, the multi-temperature exchanger also includes a second tee fitting 66, which has a third channel 661 and a fourth channel 662 that are not interconnected. The hot water pipe 40 is connected to the first end of the second tee fitting 66, the water inlet pipe 50 of the water tank 70 is connected to the second end of the second tee fitting 66, the heat exchange outer pipe 20 and the heat exchange inner pipe 10 are both connected to the third end of the second tee fitting 66, the hot water pipe 40 is connected to the heat exchange channel 11 through the third channel 661, and the water inlet pipe 50 of the water tank 70 is connected to the clean water channel 21 through the fourth channel 662.

[0054] A tee can also be installed on the heat exchange outer tube 20 at the position corresponding to the first outlet 12 and the second outlet 13, so that the preset temperature outlet pipe 63 can be inserted into the heat exchange outer tube 20 and then connected to the heat exchange channel 11 in the heat exchange inner tube 10.

[0055] First tee fitting 65 and second tee fitting 66, etc., can be connected to other structures by high-frequency brazing and laser welding. This method does not involve the use of hazardous gases, making it more energy-efficient, safe, and effective. Furthermore, because it uses welding instead of threaded connections, it is less likely to experience nut loosening due to vibration during transportation, which could lead to leaks at the joint.

[0056] Second embodiment:

[0057] Please see Figure 9 Compared to the first embodiment, the difference in the multi-temperature exchanger of the second embodiment of this utility model is that a hot water proportional valve 614 is provided at the hot water pipe 612, and a temperature sensor 615 is provided at the mixing pipe 613. The temperature sensor 615 is signal-connected to the hot water proportional valve 614, and the hot water pipe 612 is connected to the hot water pipe 40. The temperature value is determined by the temperature sensor 615 at the mixing pipe 613, and then the temperature value is fed back to the hot water proportional valve 614. The hot water proportional valve 614 adjusts the flow rate of the first part of hot water passing through the hot water pipe 612 based on the temperature value fed back by the temperature sensor 615 and the set temperature, thereby adjusting the ratio of the first part of hot water and the second part of hot water in the mixing pipe 613, and thus adjusting the temperature of the mixed hot water. If the fed-back temperature value is higher than the set temperature, the flow rate of the first part of hot water passing through the hot water pipe 612 is reduced; if the fed-back temperature value is lower than the set temperature, the flow rate of the first part of hot water passing through the hot water pipe 612 is increased, realizing intelligent outlet water temperature control, which facilitates obtaining more accurate warm water at the desired temperature.

[0058] Of course, in the first embodiment, a hot water proportional valve 614 can also be provided at the hot water pipe 612, and a temperature sensor 615 can be provided at the mixing pipe 613. The temperature sensor 615 is connected to the hot water proportional valve 614. The only difference from the second embodiment is that the hot water pipe 612 is connected to the second water inlet.

[0059] The hot water proportional valve 614 can be an electric proportional valve. The temperature sensor 615 can first send the temperature value to a processor, integrated circuit or other structure with processing function, and then send the control signal to the electric proportional valve after comparing the temperature, thereby realizing intelligent temperature control.

[0060] Third embodiment:

[0061] Please see Figure 10Compared with the first embodiment, the difference of the multi-temperature exchanger in the second embodiment of this utility model is that the cold water pipe 611 and the hot water pipe 612 are connected to the mixing pipe 613 through the manual regulating valve 616. By adjusting the manual regulating valve 616, the hot water pipe 612 is connected to the hot water pipe 40, thereby adjusting the ratio of the first part of hot water and the second part of hot water entering the mixing pipe 613, and thus adjusting the temperature of the water coming out of the temperature regulating faucet 62.

[0062] Of course, in the first embodiment, the cold water pipe 611 and the hot water pipe 612 can also be designed to be connected to the mixing pipe 613 through the manual regulating valve 616. The user can adjust the manual regulating valve 616. The only difference from the second embodiment is that the hot water pipe 612 is connected to the second water inlet.

[0063] The aforementioned multi-temperature exchanger can be applied to an electric water heater / dispenser, which includes: a multi-temperature exchanger as described above. In this embodiment, the electric water heater / dispenser includes a water tank 70 and a hot water tap 71, with the hot water tap 71 connected to the water tank 70.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-temperature exchanger, characterized by, include: Heat exchanger inner tube, heat exchanger outer tube, clean water inlet pipe, hot water pipe, water tank inlet pipe and multi-temperature water outlet assembly; The inner heat exchange tube is inserted inside the outer heat exchange tube, and a heat exchange channel is formed inside the inner heat exchange tube. A clean water channel is formed between the outer side of the inner heat exchange tube and the inner side of the outer heat exchange tube. The purified water inlet pipe is connected to the inlet end of the purified water channel; The hot water pipe is connected to the inlet end of the heat exchange channel, and a hot water shut-off valve is installed on the hot water pipe. The water tank inlet pipe is connected to the water outlet of the water purification channel; The multi-temperature water outlet assembly includes a hot and cold water tee and a temperature-adjustable faucet. The hot and cold water tee includes a cold water pipe, a hot water pipe, and a mixing pipe. The cold water pipe and the hot water pipe are both connected to the mixing pipe. The cold water pipe is connected to the outlet end of the heat exchange channel. The hot water pipe is connected to the hot water pipe or the heat exchange channel. The mixing pipe is connected to the temperature-adjustable faucet.

2. A multi-temperature heat exchanger according to claim 1, wherein: A proportional valve for hot water is installed at the hot water pipe, and a temperature sensor is installed at the mixing pipe. The temperature sensor is connected to the proportional valve for hot water.

3. A multiple temperature heat exchanger as claimed in claim 1, wherein: The cold water pipe and the hot water pipe are connected to the mixing pipe via a manual regulating valve.

4. A multiple temperature heat exchanger as claimed in claim 1, wherein: The multi-temperature water outlet assembly further includes a preset temperature water outlet pipe and a preset temperature faucet. A first water outlet and a second water outlet are provided in the heat exchange channel. The first water outlet and the second water outlet are located between the water inlet end and the water outlet end of the heat exchange channel. The first water outlet and the second water outlet are arranged sequentially from the water inlet end to the water outlet end of the heat exchange channel. The preset temperature water outlet pipe is connected to the first water outlet and the preset temperature faucet respectively, and the hot water pipe is connected to the second water outlet.

5. A multiple temperature heat exchanger as claimed in claim 4, wherein: The multi-temperature water outlet assembly also includes multiple preset temperature water outlet pipes and multiple preset temperature water taps. Multiple first water outlets are provided in the heat exchange channel. The multiple first water outlets are arranged sequentially from the water inlet end of the heat exchange channel to the water outlet end of the heat exchange channel. The preset temperature water outlet pipes are respectively connected to the first water outlets and the preset temperature water taps.

6. A multiple temperature heat exchanger as claimed in claim 5, wherein: The multiple preset temperature faucets are respectively 80℃ faucets and 60℃ faucets.

7. A multiple temperature heat exchanger according to any one of claims 1 to 6, wherein: Both the inner heat exchange tube and the outer heat exchange tube are corrugated stainless steel tubes.

8. A multiple temperature heat exchanger according to any one of claims 1 to 6, wherein: The multi-temperature exchanger also includes a first tee fitting, which has a first channel and a second channel that are not interconnected. The purified water inlet pipe is connected to the first end of the first tee fitting, the cold water pipe is connected to the second end of the first tee fitting, the heat exchange outer pipe and the heat exchange inner pipe are both connected to the third end of the first tee fitting, the purified water inlet pipe is connected to the purified water channel through the first channel, and the cold water pipe is connected to the heat exchange channel through the second channel.

9. A multiple temperature heat exchanger according to any one of claims 1 to 6, wherein: The multi-temperature exchanger also includes a second three-way fitting, which has a third and a fourth channel that are not interconnected. The hot water pipe is connected to the first end of the second three-way fitting, the water tank inlet pipe is connected to the second end of the second three-way fitting, the heat exchange outer pipe and the heat exchange inner pipe are both connected to the third end of the second three-way fitting, the hot water pipe is connected to the heat exchange channel through the third channel, and the water tank inlet pipe is connected to the clean water channel through the fourth channel.

10. An electrically heated water boiler drinking machine, characterized in that, include: A multi-temperature exchanger as described in any one of claims 1 to 9.

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