Efficient stepping non-pressure double-capacity boiled water and warm boiled water integrated water dispenser, water tank for water dispenser and control method

Abstract

The water dispenser comprises a boiled water tank and a warm boiled water tank, a food-grade heat exchange pipe is arranged in the warm boiled water tank, and a first water inlet and a first water outlet are formed in the two ends of the heat exchange pipe; the two water openings are respectively communicated with the outside of the warm boiled water tank and are respectively communicated with a purified water source and the inside of the boiled water tank, a first heating pipe and a second heating pipe are respectively arranged in the warm boiled water tank and the boiled water tank, and the boiled water tank is provided with a boiled water outlet which is communicated with the warm boiled water tank through a boiled water pipe. The food-grade heat exchange pipe is arranged in the warm boiled water tank, when the water dispenser works stably, boiled water in the boiled water tank is injected into the warm boiled water tank and exchanges heat with the food-grade heat exchange pipe, the boiled water is cooled into warm boiled water, normal-temperature purified water is subjected to heat exchange to form warm water, and the warm water enters the boiled water tank and can be boiled quickly, so that boiled water and warm boiled water are prepared quickly; warm boiled water is stored in the water tank, so that the warm water supply amount is sufficient, and the campus break water taking amount requirement is particularly met.

Description

Technical Field

[0001] The invention relates to a water dispenser, in particular to a high-efficiency step-by-step pressure-free double-capacity hot and cold water integrated water dispenser, a water tank for the water dispenser and a control method. Background Art

[0002] The current step-by-step heating starts from the temperature of tap water. Moreover, many test data show that the initial heating process of water from 10℃ to 45℃ consumes the most electricity. In addition, the traditional step-by-step heating cannot meet the needs of large-capacity warm boiled water or even warm boiled water at the same time. Therefore, occasions with high demand for warm boiled water, such as schools, hospitals, and military units, often need to install a warm boiled water machine.

[0003] In addition, the current heat exchanger is a double-tube structure with a hot water pipe outside a cold water pipe. This makes the heat exchange efficiency unstable, the outer pipe dissipates heat severely, and the single flow rate is small, which cannot meet the requirement of large-scale water extraction in a short time.

[0004] Chinese patent announcement number CN2022204424050 disclosed a partial heating structure with warm water heating function on September 27, 2022, including: a first water tank, a heat exchange tube, a second water tank and a heating structure; a first water outlet and a first water inlet are provided on the first water tank, the first water inlet is connected to the outside world, the heat exchange tube is installed in the first water tank, and the water outlet of the heat exchange tube is connected to the outside world; a boiled water outlet, a heat exchange outlet and a second water inlet are provided on the second water tank, the second heating structure is installed in the second water tank, the second water inlet is connected to the first water outlet, the heat exchange outlet is connected to the water inlet of the heat exchange tube, and the boiled water outlet is connected to the outside world. This structure does not store warm boiled water, so it is not suitable for continuous large-scale warm boiled water; especially when used on campus, since warm boiled water is commonly used water, the water collection time is mainly concentrated in the class break, and this model is not suitable for use on campus. Summary of the invention

[0005] The purpose of the present invention is to provide an efficient step-by-step pressure-free dual-capacity integrated warm and boiled water drinking machine, a water tank for the drinking machine and a control method, which has a simple and reasonable structure and can supply warm boiled water for a long time and can meet the needs of occasions such as taking a large amount of warm boiled water during class breaks.

[0006] The object of the present invention is achieved in that: A high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain comprises a hot water tank and a control circuit, and also comprises a hot and cold water tank. A food-grade heat exchange tube is arranged in the hot and cold water tank. A first water inlet and a first water outlet are arranged at both ends of the food-grade heat exchange tube. The first water inlet and the first water outlet lead to the outside of the hot and cold water tank respectively, and are connected with a water inlet electric control valve and the inside of the hot and cold water tank respectively. A first heating tube and a second heating tube are arranged in the hot and cold water tank respectively. The hot and cold water tank is provided with a hot and cold water outlet, and the hot and cold water outlet is connected with the hot and cold water tank through a hot and cold water pipe. A hot and cold water inlet and a hot and cold water inlet are arranged on the hot and cold water tank respectively. The water inlet electric control valve, the first heating tube and the second heating tube are electrically connected with the control circuit respectively.

[0007] The purpose of the present invention can also be solved by the following technical measures: As a more specific solution, a high water level sensor and a low water level sensor are provided in the boiled water tank; the height of the low water level sensor is lower than the height of the boiled water inlet; the warm boiled water tank and the boiled water tank are respectively provided with a first temperature sensor and a second temperature sensor for detecting water temperature data; the high water level sensor, the low water level sensor, the first temperature sensor and the second temperature sensor are respectively electrically connected to the control circuit.

[0008] As a further solution, the warm water tank and the surface of the boiled water tank are respectively provided with a first snap-action thermostat and a second snap-action thermostat; the first snap-action thermostat and the second snap-action thermostat are respectively connected in series with the power supply circuits of the first heating tube and the second heating tube.

[0009] As a further solution, the boiled water outlet is arranged on the lower side wall of the boiled water box, and a boiled water drainage pipe is provided in the boiled water box, the lower end of the boiled water drainage pipe is connected to the inner end of the boiled water outlet, and the upper end of the boiled water drainage pipe is higher than the height of the boiled water inlet; a third temperature sensor is also provided in the boiled water box, and the third temperature sensor is electrically connected to the control circuit, the installation height of the second temperature sensor is located below the boiled water inlet and close to its height, and the installation height of the third temperature sensor is located below the upper end of the boiled water drainage pipe and close to its height.

[0010] As a further solution, the warm water inlet is on the lower side wall of the warm water tank, and the installation height of the first temperature sensor is below the warm water inlet and close to its height.

[0011] As a further solution, the food-grade heat exchange tube is spirally wound and horizontally cylindrical, and the first heating tube extends to the inner side of the cylinder of the food-grade heat exchange tube; a cover plate is provided above the food-grade heat exchange tube in the warm water tank corresponding to the food-grade heat exchange tube; or, the food-grade heat exchange tube is spirally wound, and the first heating tube is installed from the bottom of the warm water tank.

[0012] As a further solution, a boiled water inlet is provided at the bottom of the warm boiled water tank, and the boiled water pipe is connected with the warm boiled water tank through a one-way valve and the boiled water inlet; a clean water inlet is provided at the bottom of the boiled water tank, and the first water outlet of the food-grade heat exchange tube is connected with the clean water inlet through the clean water pipe, and is connected with the inside of the boiled water tank through the clean water inlet; a first baffle is provided above the boiled water inlet inside the warm boiled water tank corresponding to the inside of the boiled water tank, and / or a second baffle is provided above the clean water inlet inside the boiled water tank corresponding to the inside of the clean water inlet.

[0013] As a further solution, the warm water tank and the boiled water tank are respectively provided with a first exhaust port and a second exhaust port at the bottom, the inner ends of the first exhaust port and the second exhaust port are respectively connected with a first exhaust pipe and a second exhaust pipe, the upper ends of the first exhaust pipe and the second exhaust pipe lead to the inner upper parts of the warm water tank and the boiled water tank respectively; the upper end of the second exhaust pipe is higher than the height of the high water level sensor.

[0014] As a further solution, the warm boiled water tank and the boiled water tank are distributed laterally; the warm boiled water tank and the boiled water tank are normal pressure water tanks and are wrapped with an insulation layer on the outside; the bottom of the warm boiled water tank and the boiled water tank are also respectively provided with a first drain outlet and a second drain outlet.

[0015] A water tank for a water dispenser comprises a water tank body, wherein a food-grade heat exchange tube is arranged inside the water tank body, a first water inlet and a first water outlet are arranged at both ends of the food-grade heat exchange tube, the first water inlet and the first water outlet lead to the outside of the warm water tank respectively, a first heating tube is also arranged inside the water tank body; a drinking water storage chamber is formed inside the water tank body.

[0016] A control method for a high-efficiency step-by-step pressure-free dual-capacity boiling water temperature integrated drinking water machine, which heats and fills water in a step-by-step mode after startup, wherein when a low water level sensor does not detect water, the water inlet electric control valve opens, and the second heating tube stops heating until the low water level sensor detects water, and the second heating tube starts heating; when the second heating tube is working, when the second temperature sensor detects that the water temperature in the boiling water tank is lower than a set water temperature, the water inlet stops filling, and when the second temperature sensor detects that the water temperature in the boiling water tank reaches the set water temperature, the water inlet electric control valve continues to open to fill water; and this cycle continues until the high water level sensor detects water.

[0017] After the water level in the hot water tank reaches the high water level, if the first temperature sensor of the warm water tank detects that the water temperature has reached the insulation temperature, the first heating tube is controlled to start heating; if the temperature of the warm water tank is lower than a certain value of the insulation setting temperature: if the temperature of the hot water tank has reached the boiling water setting temperature, the first heating tube stops heating; if the temperature of the hot water tank is lower than a certain value of the boiling water setting temperature, the first heating tube is controlled to start heating; when there is water in the warm water tank, the hot water tank automatically controls the second heating tube to heat according to the set boiling water temperature.

[0018] In addition, when there is no water in the warm water tank, the first heating tube of the warm water tank stops heating; when there is water in the warm water tank and there is no high water level in the warm water tank, when the second heating tube of the warm water tank is heating, the first heating tube of the warm water tank stops heating; when the second heating tube of the warm water tank is not heated, the warm water tank automatically controls the heating of the first heating tube of the warm water tank according to the insulation setting temperature, and stops heating when the first temperature sensor detects that the water temperature reaches the insulation temperature, and starts heating when it is lower than a certain value of the insulation temperature; when there is a high water level in the warm water tank, the warm water tank stops heating when water is flowing in, and automatically controls the heating of the first heating tube according to the insulation setting temperature when no water is flowing in.

[0019] When there is no low water level in the hot water tank, the water inlet electric control valve opens; when there is a low water level but no high water level in the hot water tank, the water inlet electric control valve is opened and closed in a stepping mode; when there are high and low water levels in the hot water tank and there is no water in the warm water tank, the water inlet electric control valve opens; when there are high and low water levels in the hot water tank and there is water in the warm water tank, when the water temperature in the warm water tank is higher than a certain value of the set insulation temperature, the water inlet electric control valve opens.

[0020] The beneficial effects of the present invention are as follows: (1) The present invention is provided with a warm boiled water tank, and a food-grade heat exchange tube for circulating purified water is arranged in the warm boiled water tank. When the water dispenser is working stably, the boiled water in the boiled water tank is injected into the warm boiled water tank for heat exchange with the food-grade heat exchange tube, so that the boiled water is cooled down to form warm boiled water. The room temperature purified water is heat exchanged to form warm water. The warm water enters the boiled water tank and can be boiled quickly, so that boiled water and warm boiled water can be prepared quickly. At the same time, because the warm boiled water is stored in a water tank, the supply of warm water is sufficient, especially meeting the water intake requirement during school breaks.

[0021] (2) The hot water tank of the present invention adopts step-by-step heating, that is, heating starts when the water level is higher than the height of the low water level sensor after water is filled in, until the water level reaches the height of the high water level sensor, so as to improve the heating efficiency.

[0022] (3) The warm water tank of the present invention is provided with a first heating element, which can start heating when the water temperature is lower than the set temperature range and no boiled water is prepared.

[0023] (4) The heat exchange tube of the present invention is arranged in the water tank, and the heat in the water tank is fully utilized, so the heat exchange effect of the heat exchange tube is more efficient and energy-saving; and the heat exchange tube is made of food-grade materials, and drinking water can be stored in the water tank, and the drinking water after heat exchange can reach the warm water level and can be drunk directly; (5) The water in the warm water tank of the present invention is boiled water, which is fully heat exchanged through the cold water large coil. The water in the warm water tank is about 45°C, and the water entering the water tank (the water in the coil) is also about 45°C. It can be boiled by heating in a short time, which is more energy-saving. The warm water tank and the hot water tank are connected through a hot water pipe and a one-way valve, which meets the demand for a large amount of boiled water and the demand for warm boiled water, and can provide large-capacity boiled water, warm boiled water, and room temperature water. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the back structure of the water channel according to an embodiment of the present invention.

[0025] Figure 2 for Figure 1 Front structural diagram.

[0026] Figure 3 It is a left-side structural schematic diagram of the medium-temperature boiling water tank of the present invention.

[0027] Figure 4 It is a schematic diagram of the structure of the warm water tank from the right side according to the present invention.

[0028] Figure 5 It is a schematic diagram of the structure of the medium-temperature boiling water tank viewed from above in the present invention.

[0029] Figure 6 It is a schematic diagram of the structure of the warm water tank in the present invention when viewed from above.

[0030] Figure 7 It is a right view structural schematic diagram of the open water tank in the present invention.

[0031] Figure 8 It is a schematic diagram of the top view of the open water tank in the present invention.

[0032] Fig. 9 It is a schematic diagram of the structure of the open water tank in the present invention when viewed from above.

[0033] Fig.10 It is a structural schematic diagram of another embodiment of the medium-temperature boiling water tank of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: See also Figures 1 to 9As shown, a high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain comprises a hot water tank 6, a hot and cold water tank 1 and a control circuit. A food-grade heat exchange tube 3 is arranged in the hot and cold water tank 1. A first water inlet 31 and a first water outlet 32 ​​are arranged at both ends of the food-grade heat exchange tube 3. The first water inlet 31 and the first water outlet 32 ​​lead to the outside of the hot and cold water tank 1 respectively, and are connected to the water inlet electric control valve 4 and the inside of the hot and cold water tank 6 respectively. A first heating tube 2 and a second heating tube 7 are arranged in the hot and cold water tank 1 and the hot and cold water tank 6 respectively. A hot and cold water outlet 65 is arranged in the hot and cold water tank 6, and the hot and cold water outlet 65 is connected to the hot and cold water tank 1 through a hot and cold water pipe 20. A hot and cold water intake 12 and a hot and cold water intake 69 are arranged in the hot and cold water tank 1 and the hot and cold water tank 6 respectively. The first heating tube 2 and the second heating tube 7 are electrically connected to the control circuit respectively; the warm water inlet 12 and the boiled water inlet 69 are connected to the warm water inlet nozzle and the boiled water inlet nozzle respectively through the first solenoid valve and the second solenoid valve, which are not shown in the figure.

[0035] The surfaces of the warm water tank 1 and the boiled water tank 6 are respectively provided with a first sudden jump thermostat 18 and a second sudden jump thermostat 66, and the warm water tank 1 and the boiled water tank 6 are respectively provided with a first temperature sensor 131 and a second temperature sensor 673 for detecting water temperature data; the first sudden jump thermostat 18 and the second sudden jump thermostat 66 are respectively connected in series with the power supply circuits of the first heating tube 2 and the second heating tube 7; the first temperature sensor 131 and the second temperature sensor 673 are respectively electrically connected to the control circuit.

[0036] The boiled water outlet 65 is arranged on the lower side wall of the boiled water tank 6, and a boiled water drainage pipe 651 is arranged in the boiled water tank 6, the lower end of the boiled water drainage pipe 651 is connected with the inner end of the boiled water outlet 65, and the upper end of the boiled water drainage pipe 651 is higher than the height of the boiled water intake 69; a third temperature sensor 674 is also arranged in the boiled water tank 6, the installation height of the second temperature sensor 673 is located below the boiled water intake 69 and close to its height, and the installation height of the third temperature sensor 674 is located below the upper end of the boiled water drainage pipe 651 and close to its height. The warm boiled water intake 6912 is on the lower side wall of the warm boiled water tank 1, and the installation height of the first temperature sensor 131 is located below the warm boiled water intake 6912 and close to its height.

[0037] The internal water temperature of the warm water tank 1 is obtained by the first temperature sensor 131 , and the internal water temperature of the warm water tank 6 is obtained by the second temperature sensor 673 .

[0038] The food-grade heat exchange tube 3 is spirally wound and horizontally placed in a cylindrical shape, and the first heating tube 2 extends to the inner side of the cylindrical shape of the food-grade heat exchange tube 3. A cover plate 14 is provided above the food-grade heat exchange tube 3 in the warm water tank 1. The cover plate can reduce the upward radiation of the boiling water temperature at the food-grade heat exchange tube 3, and the heat exchange efficiency is higher.

[0039] Or, combined Fig.10 As shown, the food-grade heat exchange tube 3 is spirally wound and longitudinally placed in a cylindrical shape, and the first heating tube 2 extends from the bottom of the warm water tank 1 to the inner side of the cylindrical shape of the food-grade heat exchange tube 3 .

[0040] A boiled water inlet 15 is provided at the bottom of the warm boiled water tank 1, and the boiled water pipe 20 is connected to the warm boiled water tank 1 through a one-way valve 5 and the boiled water inlet 15; a clean water inlet 62 is provided at the bottom of the boiled water tank 6, and the first water outlet 32 ​​of the food-grade heat exchange tube 3 is connected to the clean water inlet 62 through the clean water pipe 10, and is connected to the inside of the boiled water tank 6 through the clean water inlet 62.

[0041] A first baffle 151 is provided above the hot water inlet 15 inside the warm water tank 1, and a second baffle 621 is provided above the clean water inlet 62 inside the hot water tank 6; the baffle can prevent the incoming water from rushing straight upwards, and the water flow blocked by the baffle is dispersed in the plane direction, making the heating more uniform.

[0042] A high water level sensor 81 and a low water level sensor 82 are provided in the boiled water box 6 ; the height of the low water level sensor 82 is lower than the height of the boiled water inlet 69 .

[0043] The bottom of the warm water tank 1 and the boiled water tank 6 are respectively provided with a first exhaust port 17 and a second exhaust port 64, the inner ends of the first exhaust port 17 and the second exhaust port 64 are respectively connected to a first exhaust pipe 171 and a second exhaust pipe 641, the upper ends of the first exhaust pipe 171 and the second exhaust pipe 641 lead to the inner upper parts of the warm water tank 1 and the boiled water tank 6 respectively; the upper end of the second exhaust pipe 641 is higher than the height of the high water level sensor 81.

[0044] The warm boiled water tank 1 and the boiled water tank 6 are distributed laterally; the warm boiled water tank 1 and the boiled water tank 6 are normal pressure water tanks and are wrapped with a heat preservation layer on the outside; the bottom of the warm boiled water tank 1 and the boiled water tank 6 are also provided with a first drain port 16 and a second drain port 63 respectively.

[0045] The back of the warm water tank 1 is provided with a first mounting bracket 11 and the front is provided with a first grounding electrode 19 ; the back of the warm water tank 6 is provided with a second mounting bracket 61 and the front is provided with a second grounding electrode 68 .

[0046] The control method is: after starting up, heating and water intake are carried out in a step-by-step mode, wherein, when the low water level sensor 82 does not detect water, the water inlet electric control valve 4 is opened, and the second heating tube 7 stops heating until the low water level sensor 82 detects water, and the second heating tube 7 starts heating; when the second heating tube 7 is working, the second temperature sensor 673 detects that the water temperature in the boiling water tank 6 is lower than the set water temperature, the water intake is stopped, and when the second temperature sensor 673 detects that the water temperature in the boiling water tank 6 reaches the set water temperature, the water inlet electric control valve 4 continues to be opened to allow water to enter; and this cycle is repeated until the high water level sensor 81 detects water.

[0047] After the hot water tank 6 reaches the high water level, if the first temperature sensor 131 of the warm hot water tank 1 detects that the water temperature has reached the insulation temperature, the first heating tube 2 is controlled to start heating; if the temperature of the warm hot water tank 1 is lower than a certain value of the insulation setting temperature: if the temperature of the hot water tank 6 has reached the boiling water setting temperature, the first heating tube 2 stops heating; if the temperature of the hot water tank 6 is lower than a certain value of the boiling water setting temperature, the first heating tube 2 is controlled to start heating; when there is water in the warm hot water tank 1, the hot water tank 6 automatically controls the second heating tube 7 to heat according to the set boiling water temperature.

[0048] In addition, when the warm water tank 1 is out of water, the first heating tube 2 of the warm water tank 1 stops heating; when the warm water tank 1 has water and the water tank 6 has no high water level, the first heating tube 2 of the warm water tank 1 stops heating when the second heating tube 7 of the water tank 6 is heating; when the second heating tube 7 of the water tank 6 is not heated, the warm water tank 1 automatically controls the heating of the first heating tube 2 of the warm water tank 1 according to the insulation setting temperature, and stops heating when the first temperature sensor 131 detects that the water temperature reaches the insulation temperature, and starts heating when it is lower than a certain value of the insulation temperature; when the water tank 6 has a high water level, the warm water tank 1 stops heating when water is flowing in, and automatically controls the heating of the first heating tube 2 according to the insulation setting temperature when no water is flowing in.

[0049] When there is no low water level in the boiling water tank 6, the water inlet electric control valve 4 is opened; when there is a low water level but no high water level in the boiling water tank 6, the water inlet electric control valve 4 is opened and closed in a stepping mode; when there are high and low water levels in the boiling water tank 6 and there is no water in the warm boiling water tank 1, the water inlet electric control valve 4 is opened; when there are high and low water levels in the boiling water tank 6 and there is water in the warm boiling water tank 1, when the water temperature in the warm boiling water tank 1 is higher than a certain value of the set insulation temperature, the water inlet electric control valve 4 is opened.

[0050] Combination Figure 1 As shown, arrow a is the direction of purified water, arrow b is the water outlet direction of the food-grade heat exchange tube, arrow c is the water inlet direction of the boiled water tank 6, arrows d and e are the directions in which boiled water flows from the boiled water tank 6 to the warm boiled water tank 1; arrow f is the drainage direction of the warm boiled water tank 1, arrow g is the internal exhaust or overflow direction of the warm boiled water tank 1; arrow h is the drainage direction of the boiled water tank 6, arrow i is the internal exhaust or overflow direction of the boiled water tank 6.

[0051] An efficient step-by-step pressure-free dual-capacity hot and cold water integrated water dispenser water tank, combined with Figure 1 (One embodiment) and Fig.10 As shown in (another embodiment), it includes a water tank body (warm water tank 1), a food-grade heat exchange tube 3 is arranged inside the water tank body, and a first water inlet 31 and a first water outlet 32 ​​are arranged at both ends of the food-grade heat exchange tube 3, the first water inlet 31 and the first water outlet (32) are respectively connected to the outside of the warm water tank 1, and a first heating tube 2 is also arranged inside the water tank body; a drinking water storage cavity is formed inside the water tank body. Other undescribed structures of the water tank are described in the above high-efficiency step-by-step pressure-free dual-capacity warm and hot water integrated water dispenser.

[0052] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An efficient step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain, comprising a hot water tank (6) and a control circuit, characterized in that: The invention also comprises a warm water tank (1), wherein a food-grade heat exchange tube (3) is arranged in the warm water tank (1), and a first water inlet (31) and a first water outlet (32) are arranged at both ends of the food-grade heat exchange tube (3), the first water inlet (31) and the first water outlet (32) respectively lead to the outside of the warm water tank (1), and are respectively connected to the water inlet electric control valve (4) and the inside of the warm water tank (6), a first heating tube (2) and a second heating tube (7) are respectively arranged in the warm water tank (1) and the hot water tank (6), and the hot water tank (6) is provided with a hot water outlet (65), and the hot water outlet (65) is connected to the warm water tank (1) through a hot water tube (20); the warm water tank (1) and the hot water tank (6) are respectively provided with a warm water intake (69) (12) and a hot water intake (69); the water inlet electric control valve (4), the first heating tube (2) and the second heating tube (7) are respectively electrically connected to the control circuit.

2. The high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 1 is characterized by: The boiled water tank (6) is provided with a high water level sensor (81) and a low water level sensor (82); the height of the low water level sensor (82) is lower than the height of the boiled water inlet (69); the warm boiled water tank (1) and the boiled water tank (6) are respectively provided with a first temperature sensor (131) and a second temperature sensor (673) for detecting water temperature data; the high water level sensor (81), the low water level sensor (82), the first temperature sensor (131) and the second temperature sensor (673) are respectively electrically connected to the control circuit.

3. The high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 1 is characterized in that: A first sudden jump type thermostat (18) and a second sudden jump type thermostat (66) are respectively provided on the surface of the warm water tank (1) and the hot water tank (6); the first sudden jump type thermostat (18) and the second sudden jump type thermostat (66) are respectively connected in series with the power supply circuits of the first heating tube (2) and the second heating tube (7).

4. The high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 2 is characterized in that: The boiled water outlet (65) is arranged on the lower side wall of the boiled water box (6); a boiled water drainage pipe (651) is arranged in the boiled water box (6); the lower end of the boiled water drainage pipe (651) is connected to the inner end of the boiled water outlet (65); the upper end of the boiled water drainage pipe (651) is higher than the height of the boiled water intake (69); a third temperature sensor (674) is also arranged in the boiled water box (6); the third temperature sensor (674) is electrically connected to the control circuit; the installation height of the second temperature sensor (673) is located below the boiled water intake (69) and close to its height; the installation height of the third temperature sensor (674) is located below the upper end of the boiled water drainage pipe (651) and close to its height; The warm water inlet (69) (12) is located on the lower side wall of the warm water tank (1), and the installation height of the first temperature sensor (131) is located below the warm water inlet (69) (12) and close to its height.

5. The high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 1 is characterized in that: The food-grade heat exchange tube (3) is spirally wound and horizontally placed in a cylindrical shape, and the first heating tube (2) extends to the inner side of the cylindrical shape of the food-grade heat exchange tube (3); a cover plate (14) is provided above the food-grade heat exchange tube (3) in the warm water tank (1); Alternatively, the food-grade heat exchange tube (3) is spirally wound, and the first heating tube (2) is installed from the bottom of the warm water tank (1).

6. The high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 1 is characterized in that: The bottom of the warm water tank (1) is provided with a water inlet (15), and the water pipe (20) is connected to the warm water tank (1) through a one-way valve (5) and the water inlet (15); the bottom of the water tank (6) is provided with a clean water inlet (62), and the first water outlet (32) of the food-grade heat exchange tube (3) is connected to the clean water inlet (62) through the clean water pipe (10), and is connected to the inside of the water tank (6) through the clean water inlet (62); the inside of the warm water tank (1) is provided with a first baffle plate above the water inlet (15), and / or the inside of the water tank (6) is provided with a second baffle plate above the clean water inlet (62).

7. The high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 2 is characterized by: The bottoms of the warm water tank (1) and the boiled water tank (6) are respectively provided with a first exhaust port (17) and a second exhaust port (64); the inner ends of the first exhaust port (17) and the second exhaust port (64) are respectively connected to a first exhaust pipe (171) and a second exhaust pipe (641); the upper ends of the first exhaust pipe (171) and the second exhaust pipe (641) lead to the inner upper parts of the warm water tank (1) and the boiled water tank (6); and the upper end of the second exhaust pipe (641) is higher than the height of the high water level sensor (81).

8. A water tank for a water dispenser, comprising a water tank body, characterized in that: A food-grade heat exchange tube (3) is provided in the water tank body, and a first water inlet (31) and a first water outlet (32) are provided at both ends of the food-grade heat exchange tube (3). The first water inlet (31) and the first water outlet (32) lead to the outside of the warm water tank (1) respectively. A first heating tube (2) is also provided in the water tank body; a drinking water storage chamber is formed in the water tank body.

9. A control method for the high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 2, characterized in that: After the machine is turned on, heating and water intake are performed in a step-by-step manner, wherein when the low water level sensor (82) does not detect water, the water intake electric control valve (4) is opened, and the second heating tube (7) stops heating until the low water level sensor (82) detects the presence of water, at which time the second heating tube (7) starts heating; when the second heating tube (7) is working, the second temperature sensor (673) detects that the water temperature in the water tank (6) is lower than the set water temperature, and water intake is stopped; when the second temperature sensor (673) detects that the water temperature in the water tank (6) reaches the set water temperature, the water intake electric control valve (4) continues to be opened to allow water to enter; this cycle is repeated until the high water level sensor (81) detects the presence of water; After the water level in the hot water tank (6) reaches a high level, if the first temperature sensor (131) of the warm hot water tank (1) detects that the water temperature has reached the insulation temperature, the first heating tube (2) is controlled to start heating; if the temperature of the warm hot water tank (1) is lower than a certain value of the insulation setting temperature; if the temperature of the hot water tank (6) has reached the boiling water setting temperature, the first heating tube (2) stops heating; if the temperature of the hot water tank (6) is lower than a certain value of the boiling water setting temperature, the first heating tube (2) is controlled to start heating; when there is water in the warm hot water tank (1), the hot water tank (6) automatically controls the second heating tube (7) to heat according to the set boiling water temperature; In addition, when the warm water tank (1) is empty, the first heating tube (2) of the warm water tank (1) stops heating; when the warm water tank (1) is empty and the water tank (6) is not at a high water level, the first heating tube (2) of the warm water tank (1) stops heating when the second heating tube (7) of the water tank (6) is heating; when the second heating tube (7) of the water tank (6) is not heating, the warm water tank (1) automatically controls the heating of the first heating tube (2) of the warm water tank (1) according to the insulation setting temperature, and stops heating when the first temperature sensor (131) detects that the water temperature reaches the insulation temperature, and starts heating when the water temperature is lower than a certain insulation temperature; when the water tank (6) is at a high water level, the warm water tank (1) stops heating when water is flowing in, and when no water is flowing in, the warm water tank (1) automatically controls the heating of the first heating tube (2) according to the insulation setting temperature.

10. The control method of the high-efficiency step-by-step pressure-free dual-capacity hot and cold water integrated drinking fountain according to claim 1 is characterized in that: When the water tank (6) has no low water level, the water inlet electric control valve (4) is opened; when the water tank (6) has a low water level but no high water level, the water inlet electric control valve (4) is opened and closed in a stepping mode; when the water tank (6) has a high water level and a low water level and the warm water tank (1) has no water, the water inlet electric control valve (4) is opened; when the water tank (6) has a high water level and a low water level and the warm water tank (1) has water, and the water temperature of the warm water tank (1) is higher than a certain value of the set insulation temperature, the water inlet electric control valve (4) is opened.

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