Energy-saving hot tank

Abstract

The energy-saving hot pot provided by the present invention comprises an outer cylinder, a top plate, a bottom plate, an electric heating tube and a spiral tube; the top of the outer cylinder is sealedly connected to the top plate, and the bottom is sealedly connected to the bottom plate, and also comprises an inner cylinder arranged in the cavity of the outer cylinder, the airspace included by the straight line where the central axis of the inner cylinder radiates outward to the inner side wall of any cylinder is the inner cavity, and the airspace included by the outer side wall of the outer cylinder and the adjacent cylinder is the outer cavity; a water flow channel is arranged between the upper end of the inner cylinder and the lower surface of the top plate, and the lower end is sealedly connected to the bottom plate; the electric heating tube is fixed on the top plate or the bottom plate, and its heating part extends into the inner cavity; the spiral tube is arranged in the outer cavity or wound on the outer side wall of the cylinder adjacent to the outer cylinder; the upper opening and the lower opening of the spiral tube both pass through the outer cavity; a water inlet connected to the inner cavity is arranged on the bottom plate, and a water outlet connected to the outer cavity is arranged on the outer cylinder or the bottom plate. Compared with the prior art, this scheme has a significant energy-saving effect and low manufacturing cost.

Description

Technical Field

[0001] The invention relates to the field of drinking water equipment, and in particular to an energy-saving hot tank for a drinking water machine. Background Art

[0002] Some commercial water dispensers, especially those used by teachers and students in primary and secondary schools, need to provide boiled water to teachers and students. Since students have short breaks between classes, the dispensers also need to provide instant cold boiled water. This type of drinking water equipment that can provide drinking water to multiple people at the same time (for example, boiled water and cold boiled water or only cold boiled water, etc.) is also called a drinking water platform in the industry. At present, most drinking water platform heating systems and pipeline designs are as follows: Figure 1 As shown, the heating system is provided with a hot tank 23 and a heat exchanger 24, and the hot tank 23 is provided with an electric heating pipe 14 for heating drinking water, and there is no heating element inside the heat exchanger 24. The heat exchanger 24 can recover heat from the hot water flowing out of the hot tank 23 and use it to preheat the normal temperature drinking water flowing into the hot tank 23 from the water source inlet 21 through the water inlet valve 22; the water flowing into the hot tank 23 must first pass through the inside of the heat exchanger 24 to absorb the heat of the high temperature water and heat it up before flowing into the hot tank 23, and the high temperature water flowing out of the hot tank 23 must first pass through the inside of the heat exchanger 24 to release the heat and cool it down to become cold boiled water and then flow to the cold boiled water outlet valve 19 for drinking, and the high temperature water can be released from the hot water valve 18 at the top of the hot tank. Although the system can realize the basic function of providing boiled water and cold boiled water at the same time, the system also has defects: first, the hot tank, heat exchanger and connecting pipes are all exposed to the outside, resulting in a large heat dissipation area and low energy utilization rate; second, the separate setting of the hot tank and heat exchanger and the pipes connecting them determine that the manufacturing and installation costs are relatively high. At the same time, it also determines that the system requires a certain space to be set up and installed. The larger space requirement (referring to the three dimensions of length, width and height) limits the scope of use of the system. The larger space also means that the casing of the equipment is larger, which in turn leads to a higher manufacturing cost of the casing of the machine.

[0003] In view of the above-mentioned defects, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical defects and provide an energy-saving hot tank that can not only improve energy utilization but also reduce manufacturing and installation costs.

[0005] The present invention provides an energy-saving hot pot, which comprises an outer cylinder, a top plate, a bottom plate, an electric heating tube and a spiral tube; the top end of the outer cylinder is sealedly connected to the top plate, and the bottom end is sealedly connected to the bottom plate, and is characterized in that it also comprises an inner cylinder arranged in the cavity of the outer cylinder, the airspace included in the inner side wall of any cylinder radiated outward by the straight line where the central axis of the inner cylinder is located is the inner cavity, and the airspace included in the outer side wall of the outer cylinder and the adjacent cylinder is the outer cavity; a water flow channel is arranged between the upper end of the inner cylinder and the lower surface of the top plate, and the lower end is sealedly connected to the bottom plate; the electric heating tube is fixed on the top plate or the bottom plate, and its heating part extends into the inner cavity; the spiral tube is arranged in the outer cavity or wound on the outer side wall of the cylinder adjacent to the outer cylinder; the upper opening and the lower opening of the spiral tube both pass through the outer cavity; a water inlet connected to the inner cavity is arranged on the bottom plate, and a water outlet connected to the outer cavity is arranged on the outer cylinder or the bottom plate.

[0006] Preferably, it also includes a middle cylinder arranged in the outer cylinder cavity, and the inner cylinder is arranged in the cavity of the middle cylinder; a water flow channel is provided between the upper end of the middle cylinder and the lower surface of the top plate, and the lower end of the middle cylinder is fixedly connected to the bottom plate.

[0007] Preferably, a notch or a water flow channel is provided at the lower end or lower portion of the middle cylinder.

[0008] Preferably, the middle portion of the bottom plate is convex, and the electric heating pipe is fixed to the convex middle portion of the bottom plate.

[0009] Preferably, the upper opening of the spiral tube passes through the lower middle portion of the outer cavity.

[0010] Preferably, the upper opening of the spiral tube passes through the lower middle portion of the outer cavity; the distance between the upper end of the inner cylinder and the top plate is significantly greater than the distance between the upper end of the middle cylinder and the top plate.

[0011] Preferably, it further comprises a connecting pipe, one end of which is connected to the upper opening of the spiral tube, and the other end of which is connected to the water inlet.

[0012] Preferably, it also includes a water inlet pipe and a bypass pipe, the lower opening of the spiral tube is connected to the water source inlet through the water inlet pipe, and the water inlet pipe is provided with a water inlet valve; one end of the bypass pipe is connected to the water source inlet, and the other end is connected to the connecting pipe, and the bypass pipe is provided with a bypass valve.

[0013] Preferably, a baffle is provided at the water inlet on the bottom plate to prevent water from directly rushing upward.

[0014] Preferably, it also includes an overheat protector and a temperature probe, a hot water inlet is provided on the top plate, and a heat-insulating layer is provided on the outer side of the outer cylinder and the outer side of the top plate.

[0015] Preferably, the top plate has an upward convex shape and / or the bottom plate has a downward convex shape.

[0016] The spiral tube is formed by spirally bending a straight tube with smooth inner and outer walls on special equipment (such as a tube bending machine), and has high production efficiency, that is, the labor cost during manufacturing is low; in addition, because the inner wall is smooth, the water flow resistance is very small, so the requirement for water source pressure during operation is low, that is, the adaptability is good; thirdly, when the water flow flows in the spiral tube, it will naturally change the flow direction continuously, that is, the water flow flows forward in a constantly turning manner, and the water in the center of the tube section and the water near the tube wall continuously exchange positions, that is, rapid convection is generated, which is a forced convection, and forced convection heat exchange is the most efficient way of heat exchange, so it can greatly improve the heat exchange efficiency. That is to say, compared with the straight tube heat exchanger (water will not change its flow direction when flowing in the straight tube, and flows in a laminar manner. The water in the center of the tube and the water near the tube wall do not exchange positions. The water in the tube transfers heat to each other through conduction and natural convection. Because water is a poor conductor and the flow rate of natural convection is slow, the heat exchange efficiency is low), the heat exchange efficiency of the spiral tube heat exchanger is significantly higher. Under the premise of the same heat exchange capacity, the heat exchange area of ​​the spiral tube heat exchanger can be smaller, that is, the spiral tube heat exchanger can save materials and reduce costs.

[0017] Compared with the prior art, the energy-saving hot pot provided by the present invention has the following advantages:

[0018] 1. The technical solution of the present invention adopts the ingenious design of the spiral tube and the sleeve to realize the organic integration of the hot tank and the heat exchanger, greatly reducing the heat dissipation area and saving energy; through the heat exchange effect between the normal temperature water in the spiral tube and the high temperature water flowing into the outer cavity, cold boiled water is obtained while increasing the temperature of the normal temperature water entering the inner cavity, thereby improving the energy utilization efficiency; the temperature of the outer surface of the hot tank is reduced, and the heat loss from the outer surface of the hot tank to the environment is reduced; after the surface temperature of the hot tank is reduced, the ambient temperature near the hot tank can be reduced, so the service life of the electrical components located near the hot tank can be extended.

[0019] 2. The heat tank and heat exchanger of the present invention are organically integrated together, which reduces the manufacturing and installation costs; the size is compact and occupies a small space, which reduces the requirements for installation and use space, and can also reduce the size of the equipment shell and reduce the shell manufacturing cost.

[0020] 3. The energy-saving hot tank of the present invention cooperates with appropriate external pipelines to achieve thorough high-temperature disinfection of the cold boiled water outlet pipeline of the hot tank with high-temperature hot water, ensuring that the microbial indicators of the cold boiled water outlet are qualified, and the use of high-temperature hot water for disinfection has no side effects, which can ensure thorough disinfection and make people safe and assured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0022] Figure 1 This is a schematic diagram of the current design of the heating system and pipelines for the drinking water platform;

[0023] Figure 2 A schematic diagram of the structure of an energy-saving heat tank provided in Example 1;

[0024] Figure 3 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 2;

[0025] Figure 4 for Figure 3 Middle partial enlarged picture;

[0026] Figure 5 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 3;

[0027] Figure 6 A schematic diagram of the structure of an energy-saving heat tank provided in Example 4;

[0028] Figure 7 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 5;

[0029] Figure 8 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 6;

[0030] Fig. 9 A schematic diagram of the structure of an energy-saving heat tank provided in Example 7;

[0031] Fig.10 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 8;

[0032] Fig.11 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 9;

[0033] Fig.12 A schematic diagram of the structure of an energy-saving heat tank provided in Example 10;

[0034] Fig.13 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 11;

[0035] Fig.14 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 12;

[0036] Fig.15 A schematic diagram of the structure of an energy-saving heat tank provided in Example 13;

[0037] Fig.16 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 14;

[0038] Fig.17 A schematic diagram of the structure of the energy-saving heat tank and connecting pipelines provided in Example 15;

[0039] Fig.18 This is a schematic diagram of the structure of the energy-saving heat tank provided in Example 16. DETAILED DESCRIPTION

[0040] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0041] Embodiment 1

[0042] like Figure 2 The energy-saving heat tank includes an inner cylinder 1, an outer cylinder 3, a spiral tube 4, an upper opening 5, a top plate 8, a lower opening 11, an electric heating tube 14, a water inlet 15, a water outlet 16 and a bottom plate 17.

[0043] The top end of the outer cylinder 3 is sealed with the top plate 8, and the bottom end of the outer cylinder 3 is sealed with the bottom plate 17; the inner cylinder 1 is arranged in the cavity of the outer cylinder 3, and the airspace included in the inner wall of any cylinder radiating outward from the straight line where the central axis of the inner cylinder 1 is located is the inner cavity, and the airspace included in the outer wall of the outer cylinder 3 and the adjacent cylinder is the outer cavity. In this embodiment, the inner space of the inner cylinder 1 is the inner cavity, and the annular cavity formed by the inner cylinder 1 and the outer cylinder 3 is the outer cavity; a water flow channel is provided between the upper end of the inner cylinder 1 and the lower surface of the top plate 8, and the lower end of the inner cylinder 1 is sealed with the bottom plate 17.

[0044] The electric heating tube 14 is fixed on the bottom plate 17 or the top plate 8 (not shown in the figure), and its heating part extends into the inner cavity. Preferably, the electric heating tube 14 is fixed to the middle part of the bottom plate 17 or the top plate 8; the spiral tube 4 is arranged in the outer cavity or wound on the outer side wall of the cylinder adjacent to the outer cylinder 3. In this embodiment, it is wound on the outer side wall of the inner cylinder 1, and the upper opening 5 and the lower opening 11 of the spiral tube 4 both pass through the outer cavity. Preferably, the upper opening 5 of the spiral tube 4 passes through the top or middle part of the outer cavity, and the lower opening 11 passes through the bottom or lower part of the outer cavity; preferably, the inner wall of the spiral tube 4 is smooth and streamlined, and the water flow resistance is very small. Slightly increasing the water source pressure can significantly increase the flow rate; the bottom plate 17 is provided with a water inlet 15 connected to the inner cavity, and the outer cylinder 3 or the bottom plate 17 is provided with a water outlet 16 connected to the outer cavity. This embodiment adopts the ingenious design of spiral tubes and sleeves to achieve the organic integration of the hot tank and the heat exchanger, greatly reducing the heat dissipation area, saving energy, reducing manufacturing and installation costs, and having compact size and small space occupation, thereby reducing the requirements for installation and use space.

[0045] Embodiment 2

[0046] like Figure 3 , which is a schematic diagram of the structure of the energy-saving hot tank and connecting pipelines provided in this embodiment. The difference between this embodiment and the first embodiment is that it also includes a water inlet pipe 27, a water inlet valve 22, a connecting pipe 25, a cold boiled water outlet valve 19, a cold boiled water outlet pipe, a hot water port 7, a hot water pipe 28 and a hot water valve 18.

[0047] A hot water inlet 7 connected to the top of the inner cavity is provided on the top plate 8; a hot water pipe 28 is connected to the hot water inlet 7, and a hot water valve 18 is provided on the hot water pipe 28; a water source inlet 21 is connected to the lower opening 11 through an inlet pipe 27, and an inlet valve 22 is installed on the inlet pipe 27; one end of a connecting pipe 25 is connected to the upper opening 5, and the other end is connected to the inlet 15; a boiled water outlet pipe is connected to the outlet 16, and a boiled water outlet valve 19 is installed on the boiled water outlet pipe.

[0048] During operation, water at room temperature flows in from the water source inlet 21 through the water inlet pipe 27 from the lower opening 11, flows to the upper opening 5 through the spiral tube 4, and then flows into the inner cavity from the bottom of the hot tank through the connecting pipe 25 and the water inlet 15. The electric heating tube 14 in the inner cavity can heat the water flowing in.

[0049] When the user takes cold boiled water, the high-temperature water in the inner cavity flows from the water flow channel between the top of the inner cylinder 1 and the lower surface of the top plate 8 to the outer cavity, and then flows downward from the upper part of the outer cavity to the water outlet 16 at the bottom. When the high-temperature water flows downward from the outside of the spiral tube 4 in the outer cavity, the normal-temperature inlet water in the spiral tube 4 flows from bottom to top in the spiral tube 4 in a spiral manner. In this way, the heat of the high-temperature hot water is gradually absorbed by the normal-temperature water in the spiral tube 4 during the downward flow, so its temperature gradually decreases and becomes cold boiled water when it flows to the water outlet 16; at the same time, the temperature of the normal-temperature water gradually increases during the upward spiral flow, and the preheated inlet water flows from the upper opening 5 through the connecting pipe 25 and then from the bottom of the hot tank into the inner cavity. In the above process, most of the heat contained in the high-temperature water is recovered for preheating the incoming water during the process of becoming boiled water. The electric heating tube 14 only needs to heat the drinking water from the preheated temperature to the set temperature, that is, the temperature rise is reduced. This process not only effectively improves the energy utilization efficiency, but also improves the heating efficiency of the electric heating tube, that is, more hot water can be heated to the set temperature per unit time, which has a significant energy-saving effect and can provide more boiled water per unit time without increasing the heating power.

[0050] When the user takes high-temperature hot water, the water in the inner cavity is heated by the electric heating tube 14 and then flows out from the hot water port 7 on the top of the hot tank through the hot water pipe 28. In this process, the water outside the spiral tube 4 in the outer cavity will be gradually heated by the high-temperature water in the inner cavity, making the temperature higher and higher; on the other hand, the normal-temperature water in the spiral tube 4 will absorb the heat of the water outside the spiral tube 4, limiting the temperature rise. In this way, the temperature of the outer cylinder 3 will be maintained at a relatively low temperature, that is, the temperature difference between the outer cylinder 3 and the environment will be relatively small, so that the heat emitted by the outer cylinder 3 to the environment is relatively small, that is, the utilization rate of thermal energy is improved, and the energy-saving effect is enhanced. At the same time, the increase in the ambient temperature near the hot tank is also reduced, so the service life of the electrical components near the hot tank can be extended.

[0051] The present embodiment is different from the first embodiment in that it further comprises an overheat protector 6, a temperature probe 10, legs 12, a support plate 13, a baffle 29 and a heat-insulating layer.

[0052] The energy-saving hot tank of this embodiment includes an overheat protector 6. When the temperature inside the hot tank reaches the overheat temperature, the overheat protector automatically disconnects the heating power supply of the electric heating tube 14, and cannot automatically reset after the power is disconnected, thereby preventing the hot tank from overheating and causing danger.

[0053] like Figure 4 As shown, the temperature probe 10 and the outer sleeve 9 extend into the inner cavity together to measure the water temperature of the inner cavity; the temperature probe 10 is used for the heating control system to control the water temperature of the inner cavity of the hot tank according to the user's requirements. When the water temperature reaches the set value, the heating power supply of the electric heating tube 14 is disconnected to stop heating. When the drop in the water temperature of the inner cavity reaches the set value, the electric heating tube 14 is automatically powered on for heating.

[0054] The support plate 13 is fixedly connected or welded to the bottom plate 17 , and the legs 12 are fixedly connected under the support plate 13 . The legs 12 and the support plate 13 jointly support the energy-saving heat tank.

[0055] A baffle 29 is provided above the water inlet 15 to prevent the incoming water from rushing up quickly, that is, to prevent the water just flowing into the inner cavity from rushing to the top before being heated to the set temperature, causing the water temperature flowing out of the hot tank to fail to reach the set value. Preferably, the baffle 29 is an L-shaped baffle.

[0056] The energy-saving hot pot provided in this embodiment also includes a heat-insulating layer (not shown in the figure). The heat-insulating layer is arranged on the outside of the outer cylinder 3 and the outside of the top plate 8, and is used to reduce the heat dissipated by the hot pot to the environment, thereby maximizing the energy-saving effect. The temperature of the outer wall of the hot pot is reduced, which can reduce the temperature rise effect on the electrical components arranged near the hot pot, so that these electrical components are in a lower temperature environment, which is conducive to extending the service life of these electrical components.

[0057] Embodiment 3

[0058] like Figure 5 As shown, it is a schematic diagram of the structure of the energy-saving hot tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the second embodiment is that it also includes a bypass pipe 26 and a bypass valve 20. The water source inlet 21 is also connected to the bypass pipe 26, and the other end of the bypass pipe 26 is connected to the connecting pipe 25, and the bypass valve 20 is installed on the bypass pipe 26. The purpose of setting up the external pipeline in this way is to be able to disinfect the cold boiled water outlet pipeline with high-temperature hot water. When the cold boiled water pipeline is normally discharged, its water temperature is usually controlled at about 40°C. Such a water temperature is easy to breed bacteria, so it is necessary to sterilize the cold boiled water outlet pipeline regularly.

[0059] When the energy-saving hot pot is in a non-disinfecting state, the bypass valve 20 is closed, and no water flows in the bypass pipe 26, which is equivalent to no bypass pipeline. When the energy-saving hot pot is disinfecting, the water inlet valve 22 is closed, the bypass valve 20 is opened, the cold boiled water outlet valve 19 is also opened, and the electric heating pipe is powered on for heating. At this time, the water source water flows directly into the inner cavity through the bypass valve 20 under pressure, and is heated by the electric heating pipe 14 to become high-temperature water before flowing to the outer cavity. Because there is no water flowing in the spiral tube 4 at this time, that is, the spiral tube 4 does not have a continuous heat absorption effect, the temperature of the water in the outer cavity will gradually rise to a temperature close to the temperature of the high-temperature water in the inner cavity. Such high-temperature water flows directly to the cold boiled water outlet valve and lasts for a period of time, so that the cold boiled water outlet pipeline can be sterilized at high temperature throughout the pipeline, ensuring that the microbial indicators of the cold boiled water outlet are qualified, and the use of high-temperature hot water for disinfection has no side effects, which can ensure thorough disinfection and make people safe and assured.

[0060] Embodiment 4

[0061] like Figure 6 FIG. 2 is a schematic diagram of the structure of the energy-saving heat tank provided in the present embodiment. The energy-saving heat tank comprises an inner cylinder 1, a middle cylinder 2, an outer cylinder 3, a spiral tube 4, an upper opening 5, a top plate 8, a lower opening 11, an electric heating tube 14, a water inlet 15, a water outlet 16 and a bottom plate 17.

[0062] The top end of the outer cylinder 3 is sealed with the top plate 8, and the bottom end of the outer cylinder 3 is sealed with the bottom plate 17; the inner cylinder 1 and the middle cylinder 2 are arranged in the cavity of the outer cylinder 3, and the inner cylinder 1 is arranged in the cavity of the middle cylinder 2. In this embodiment, the cavity of the inner cylinder 1 is the inner cavity, and the annular cavity surrounded by the middle cylinder 2 and the outer cylinder 3 is the outer cavity; a water flow channel is provided between the upper ends of the middle cylinder 2 and the inner cylinder 1 and the lower surface of the top plate 8, allowing water in the inner cavity to flow into the outer cavity through the water flow channel, the lower end of the middle cylinder 2 is fixedly connected to the bottom plate 17, and the inner cylinder 1 is sealed with the bottom plate 17; the lower end or lower part of the middle cylinder 2 is provided with a notch or a water flow channel (not shown in the figure).

[0063] The electric heating tube 14 is fixed on the bottom plate 17 or the top plate 8 (not shown in the figure), and its heating part extends into the inner cavity; the spiral tube 4 is arranged in the outer cavity or wrapped on the outer side wall of the cylinder adjacent to the outer cylinder 3, in this embodiment, it is the outer side wall of the middle cylinder 2; the upper opening and the lower opening of the spiral tube 4 both pass through the outer cavity; the bottom plate 17 is provided with a water inlet 15 connected to the inner cavity, and the outer cylinder 3 or the bottom plate 17 is provided with a water outlet connected to the outer cavity.

[0064] This embodiment adopts the ingenious design of spiral tube and three-layer sleeve. In addition to the beneficial effects of embodiment 1, the setting of the middle cylinder is conducive to slowing down the heat transfer between the high-temperature water in the inner cavity and the low-temperature water in the outer cavity, that is, reducing their mutual influence; the lower end or lower part of the middle cylinder is provided with a notch or a water flow channel so that the water in the annular cavity surrounded by the middle cylinder and the inner cylinder and the water in the outer cavity can flow to each other at a smaller flow rate, preventing the water in the annular cavity surrounded by the middle cylinder and the inner cylinder from becoming "dead water", and allowing the annular cavity surrounded by the middle cylinder and the inner cylinder to still maintain a good buffering or isolation effect.

[0065] Embodiment 5

[0066] like Figure 7 , which is a schematic diagram of the structure of the energy-saving hot tank and connecting pipelines provided in this embodiment. The difference between this embodiment and the fourth embodiment is that it also includes a water inlet pipe 27, a water inlet valve 22, a connecting pipe 25, a cold boiled water outlet valve 19, a cold boiled water outlet pipe, a hot water port 7, a hot water pipe 28 and a hot water valve 18.

[0067] A hot water inlet 7 connected to the top of the inner cavity is provided on the top plate 8; a hot water pipe 28 is connected to the hot water inlet 7, and a hot water valve 18 is provided on the hot water pipe 28; a water source inlet 21 is connected to the lower opening 11 through an inlet pipe 27, and an inlet valve 22 is installed on the inlet pipe 27; one end of a connecting pipe 25 is connected to the upper opening 5, and the other end is connected to the inlet 15; a boiled water outlet pipe is connected to the outlet 16, and a boiled water outlet valve 19 is installed on the boiled water outlet pipe.

[0068] During operation, water at room temperature flows in from the water source inlet 21 through the water inlet pipe 27 from the lower opening 11, flows to the upper opening 5 through the spiral tube 4, and then flows into the inner cavity from the bottom of the hot tank through the connecting pipe 25 and the water inlet 15. The electric heating tube 14 in the inner cavity can heat the water flowing in.

[0069] When the user takes cold boiled water, the high-temperature water in the inner cavity flows from the water flow channel between the top of the inner cylinder 1 and the middle cylinder 2 and the lower surface of the top plate 8 to the outer cavity, and then flows downward from the upper part of the outer cavity to the water outlet 16 at the bottom. When the high-temperature water flows downward from the outside of the spiral tube 4 in the outer cavity, the normal-temperature inlet water in the spiral tube 4 flows from bottom to top in the spiral tube 4 in a spiral manner. In this way, the heat of the high-temperature hot water is gradually absorbed by the normal-temperature water in the spiral tube 4 during the downward flow, so its temperature gradually decreases and becomes cold boiled water when it flows to the water outlet 16; at the same time, the temperature of the normal-temperature water gradually increases during the upward spiral flow, and the preheated inlet water flows from the upper opening 5 through the connecting pipe 25 and then from the bottom of the hot tank into the inner cavity. In the above process, most of the heat contained in the high-temperature water is recovered for preheating the incoming water during the process of becoming boiled water. The electric heating tube 14 only needs to heat the drinking water from the preheated temperature to the set temperature, that is, the temperature rise is reduced. This process not only effectively improves the energy utilization efficiency, but also improves the heating efficiency of the electric heating tube, that is, more hot water can be heated to the set temperature per unit time, which has a significant energy-saving effect and can provide more boiled water per unit time without increasing the heating power.

[0070] When the user takes the high-temperature hot water, the water in the inner cavity is heated by the electric heating tube 14 and then flows out from the hot water port 7 on the top of the hot tank through the hot water pipe 28. In this process, on the one hand, due to the isolation effect of the annular cavity surrounded by the middle cylinder 2 and the inner cylinder 1, the degree of heating of the water outside the spiral tube 4 in the outer cavity by the high-temperature water in the inner cavity is reduced; on the other hand, the normal-temperature water in the spiral tube 4 will absorb the heat of the water outside the spiral tube 4 in the outer cavity, limiting the temperature rise. In this way, the temperature of the outer cylinder 3 will be maintained at a relatively low temperature state, that is, the temperature difference between the outer cylinder 3 and the environment will be relatively small, so that the heat dissipated by the outer cylinder 3 to the environment is relatively small, that is, the utilization rate of thermal energy is improved, and the energy-saving effect is enhanced. At the same time, the increase in the ambient temperature near the hot tank is also reduced, so the service life of the electrical components near the hot tank can be extended.

[0071] The present embodiment is different from the fourth embodiment in that it also includes an overheat protector 6, a temperature probe 10, a leg 12, a support plate 13, a baffle 29 and a thermal insulation layer. The arrangement and function of the overheat protector 6, the temperature probe 10, the leg 12, the support plate 13, the baffle 29 and the thermal insulation layer are exactly the same as those in the second embodiment.

[0072] Embodiment 6

[0073] like Figure 8As shown, it is a schematic diagram of the structure of the energy-saving hot tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the fifth embodiment is that it also includes a bypass pipe 26 and a bypass valve 20. The water source inlet 21 is also connected to the bypass pipe 26, and the other end of the bypass pipe 26 is connected to the connecting pipe 25, and the bypass valve 20 is installed on the bypass pipe 26. The purpose of setting up the external pipeline in this way is to be able to disinfect the cold boiled water outlet pipeline with high-temperature hot water. When the cold boiled water pipeline is normally discharged, its water temperature is usually controlled at about 40°C. Such a water temperature is easy to breed bacteria, so it is necessary to sterilize the cold boiled water outlet pipeline regularly.

[0074] When the energy-saving hot pot is in a non-disinfecting state, the bypass valve 20 is closed, and no water flows in the bypass pipe 26, which is equivalent to no bypass pipeline. When the energy-saving hot pot is disinfecting, the water inlet valve 22 is closed, the bypass valve 20 is opened, the cold boiled water outlet valve 19 is also opened, and the electric heating pipe is powered on for heating. At this time, the water source water flows directly into the inner cavity through the bypass valve 20 under pressure, and is heated by the electric heating pipe 14 to become high-temperature water before flowing to the outer cavity. Because there is no water flowing in the spiral tube 4 at this time, that is, the spiral tube 4 does not have a continuous heat absorption effect, the temperature of the water in the outer cavity will gradually rise to a temperature close to the temperature of the high-temperature water in the inner cavity. Such high-temperature water flows directly to the cold boiled water outlet valve and lasts for a period of time, so that the cold boiled water outlet pipeline can be sterilized at high temperature throughout the pipeline, ensuring that the microbial indicators of the cold boiled water outlet are qualified, and the use of high-temperature hot water for disinfection has no side effects, which can ensure thorough disinfection and make people safe and assured.

[0075] Embodiment 7

[0076] like Fig. 9 As shown, it is a schematic diagram of the structure of the energy-saving hot pot provided in this embodiment. The difference between this embodiment and the fourth embodiment is that the middle part of the bottom plate 17 is convex, and the electric heating tube 14 is fixed to the convex middle part of the bottom plate 17. Through such a design, the degree of preheating of the part of the spiral tube 4 near the bottom plate by the high-temperature water in the inner cavity is reduced, so as to strengthen the heat exchange effect of the part of the spiral tube 4 near the bottom plate, increase the temperature drop of the boiled water in the inner cavity through the outer cavity to the water outlet 16, and make the temperature of the water at the water outlet 16 reach the ideal cold boiled water temperature.

[0077] Embodiment 8

[0078] like Fig.10As shown, it is a schematic diagram of the structure of the energy-saving heat tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the fifth embodiment is that the middle part of the bottom plate 17 is convex, and the electric heating tube 14 is fixed to the convex middle part of the bottom plate 17. Through such a design, the degree of preheating of the part of the spiral tube 4 near the bottom plate by the high-temperature water in the inner cavity is reduced, so as to strengthen the heat exchange effect of the part of the spiral tube 4 near the bottom plate, increase the temperature drop of the boiled water in the inner cavity through the outer cavity to the water outlet 16, so that the temperature of the water at the water outlet 16 can reach the ideal cold boiled water temperature.

[0079] Embodiment 9

[0080] like Fig.11 As shown, it is a schematic diagram of the structure of the energy-saving heat tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the sixth embodiment is that the middle part of the bottom plate 17 is convex, and the electric heating tube 14 is fixed to the convex middle part of the bottom plate 17. Through such a design, the degree of preheating of the part of the spiral tube 4 near the bottom plate by the high-temperature water in the inner cavity is reduced, so as to strengthen the heat exchange effect of the part of the spiral tube 4 near the bottom plate, increase the temperature drop of the boiled water in the inner cavity through the outer cavity to the water outlet 16, so that the temperature of the water at the water outlet 16 can reach the ideal cold boiled water temperature.

[0081] Embodiment 10

[0082] like Fig.12 The figure shows the schematic diagram of the structure of the energy-saving hot pot provided by the present embodiment. The difference between the present embodiment and the seventh embodiment is that the upper opening 5 of the spiral tube 4 passes through the middle and lower part of the outer cavity, and by increasing the proportion of the tube section of the spiral tube 4 close to the bottom plate 17, the degree of preheating of the spiral tube 4 by the high-temperature water in the inner cavity is further reduced, the heat exchange effect of the spiral tube 4 is enhanced, and the temperature drop of the boiled water in the inner cavity from the outer cavity to the water outlet 16 is increased, so that the temperature of the water at the water outlet 16 can reach the ideal boiled water temperature.

[0083] Embodiment 11

[0084] like Fig.13 , which is a schematic diagram of the structure of the energy-saving hot tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the eighth embodiment is that the upper opening 5 of the spiral tube 4 passes through the middle and lower part of the outer cavity, and by increasing the proportion of the tube section of the spiral tube 4 close to the bottom plate 17, the degree of preheating of the spiral tube 4 by the high-temperature water in the inner cavity is further reduced, and the heat exchange effect of the spiral tube 4 is strengthened, and the temperature drop of the boiled water in the inner cavity through the outer cavity to the water outlet 16 is increased, so that the temperature of the water at the water outlet 16 can reach the ideal cold boiled water temperature.

[0085] Embodiment 12

[0086] like Fig.14The figure shows a schematic diagram of the structure of the energy-saving hot tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the ninth embodiment is that the upper opening 5 of the spiral tube 4 passes through the middle and lower part of the outer cavity, and by increasing the proportion of the tube section of the spiral tube 4 close to the bottom plate 17, the degree of preheating of the spiral tube 4 by the high-temperature water in the inner cavity is further reduced, and the heat exchange effect of the spiral tube 4 is enhanced, and the temperature drop of the boiled water in the inner cavity from the outer cavity to the water outlet 16 is increased, so that the temperature of the water at the water outlet 16 can reach the ideal cold boiled water temperature.

[0087] Embodiment 13

[0088] like Fig.15 As shown, it is a schematic diagram of the structure of the energy-saving hot pot provided in this embodiment. The energy-saving hot pot provided in this embodiment is different from that in the tenth embodiment in that: the distance between the upper end of the inner cylinder 1 and the top plate 8 is significantly greater than the distance between the upper end of the middle cylinder 2 and the top plate 8, and the electric heating tube 14 heats the water in the inner cylinder 1 while heating the water in the cavity of the middle cylinder 2 that is higher than the upper end of the inner cylinder 1, that is, in this embodiment, the cavity of the inner cylinder 1 and the cavity of the middle cylinder 2 that is higher than the upper end of the inner cylinder 1 are the inner cavity. Since the volume of the inner cavity that can be heated by the electric heating tube 14 is the effective volume of the hot pot for holding water, lowering the height of the inner cylinder 1 achieves the purpose of minimizing the volume of the annular cavity surrounded by the inner cylinder 1 and the middle cylinder 2 and increasing the volume of the heated inner cavity without affecting the heating performance of the hot pot.

[0089] Embodiment 14

[0090] like Fig.16 As shown, it is a schematic diagram of the structure of the energy-saving hot pot and the connecting pipeline provided in this embodiment. The energy-saving hot pot provided in this embodiment is different from that in the eleventh embodiment in that: the distance between the upper end of the inner cylinder 1 and the top plate 8 is significantly greater than the distance between the upper end of the middle cylinder 2 and the top plate 8, and the electric heating tube 14 heats the water in the inner cylinder 1 while heating the water in the cavity of the middle cylinder 2 that is higher than the upper end of the inner cylinder 1, that is, in this embodiment, the cavity of the inner cylinder 1 and the cavity of the middle cylinder 2 that is higher than the upper end of the inner cylinder 1 are the inner cavity. Since the volume of the inner cavity that can be heated by the electric heating tube 14 is the effective volume of the hot pot for holding water, lowering the height of the inner cylinder 1 achieves the purpose of minimizing the volume of the annular cavity surrounded by the inner cylinder 1 and the middle cylinder 2 and increasing the volume of the heated inner cavity without affecting the heating performance of the hot pot.

[0091] Embodiment 15

[0092] like Fig.17 The figure is a schematic diagram of the structure of the energy-saving heat tank and the connecting pipeline provided in this embodiment. The difference between this embodiment and the twelfth embodiment is that:

[0093] The distance between the upper end of the inner cylinder 1 and the top plate 8 is significantly greater than the distance between the upper end of the middle cylinder 2 and the top plate 8. The electric heating tube 14 heats the water in the inner cylinder 1 while heating the water in the cavity of the middle cylinder 2 that is higher than the upper end of the inner cylinder 1. That is, in this embodiment, the cavity of the inner cylinder 1 and the cavity of the middle cylinder 2 that is higher than the upper end of the inner cylinder 1 are the inner cavity. Since the volume of the inner cavity that can be heated by the electric heating tube 14 is the effective volume of the hot pot for holding water, lowering the height of the inner cylinder 1 achieves the purpose of minimizing the volume of the annular cavity surrounded by the inner cylinder 1 and the middle cylinder 2 and increasing the volume of the heated inner cavity without affecting the heating performance of the hot pot.

[0094] Embodiment 16

[0095] like Fig.18 The energy-saving heat tank provided in this embodiment is different from the first embodiment in that the top plate 8 has an upward convex shape and the bottom plate 17 has a downward convex shape, and the outward convex shape makes the heat tank shell have better pressure bearing capacity.

[0096] The energy-saving hot tank provided by the present invention has the following advantages:

[0097] 1. The technical solution of the present invention adopts the ingenious design of the spiral tube and the sleeve to realize the organic integration of the hot tank and the heat exchanger, greatly reducing the heat dissipation area and saving energy; through the heat exchange effect between the normal temperature water in the spiral tube and the high temperature water flowing into the outer cavity, cold boiled water is obtained while increasing the temperature of the normal temperature water entering the inner cavity, thereby improving the energy utilization efficiency; the temperature of the outer surface of the hot tank is reduced, and the heat loss from the outer surface of the hot tank to the environment is reduced; after the surface temperature of the hot tank is reduced, the ambient temperature near the hot tank can be reduced, so the service life of the electrical components located near the hot tank can be extended.

[0098] 2. The heat tank and heat exchanger of the present invention are organically integrated together, which reduces the manufacturing and installation costs; the size is compact and occupies a small space, which reduces the requirements for installation and use space, and can also reduce the size of the equipment shell and reduce the shell manufacturing cost.

[0099] 3. The energy-saving hot tank of the present invention cooperates with appropriate external pipelines to achieve thorough high-temperature disinfection of the cold boiled water outlet pipeline of the hot tank with high-temperature hot water, ensuring that the microbial indicators of the cold boiled water outlet are qualified, and the use of high-temperature hot water for disinfection has no side effects, which can ensure thorough disinfection and make people safe and assured.

[0100] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. An energy-saving heat tank, comprising an outer cylinder, a top plate, a bottom plate, an electric heating tube and a spiral tube; the top end of the outer cylinder is sealedly connected to the top plate, and the bottom end is sealedly connected to the bottom plate, characterized in that: It also includes an inner cylinder arranged in the cavity of the outer cylinder, the airspace included in the inner wall of any cylinder radiated outward from the straight line where the central axis of the inner cylinder is located is the inner cavity, and the airspace included in the outer wall of the outer cylinder and the adjacent cylinder is the outer cavity; a water flow channel is provided between the upper end of the inner cylinder and the lower surface of the top plate, and the lower end is sealed and connected to the bottom plate; the electric heating tube is fixed on the top plate or the bottom plate, and its heating part extends into the inner cavity; the spiral tube is arranged in the outer cavity or wound on the outer wall of the cylinder adjacent to the outer cylinder; the upper opening and the lower opening of the spiral tube both pass through the outer cavity; a water inlet connected to the inner cavity is provided on the bottom plate, and a water outlet connected to the outer cavity is provided on the outer cylinder or the bottom plate; It also includes a middle cylinder arranged in the cavity of the outer cylinder, and the inner cylinder is arranged in the cavity of the middle cylinder; a water flow channel is arranged between the upper end of the middle cylinder and the lower surface of the top plate, and the lower end of the middle cylinder is fixedly connected to the bottom plate; a baffle is arranged at the water inlet on the bottom plate to prevent water from directly rushing upward; The upper opening of the spiral tube passes through the middle and lower part of the outer cavity; the distance between the upper end of the inner cylinder and the top plate is significantly greater than the distance between the upper end of the middle cylinder and the top plate; the middle part of the bottom plate is convex, and the electric heating tube is fixed to the convex middle part of the bottom plate.

2. The energy-saving hot pot according to claim 1, characterized in that: The lower end or lower part of the middle cylinder is provided with a notch or a water flow channel.

3. An energy-saving hot pot according to any one of claims 1-2, characterized in that: It also includes a connecting pipe, one end of which is connected to the upper opening of the spiral tube, and the other end of which is connected to the water inlet.

4. The energy-saving hot pot according to claim 3, characterized in that: It also includes a water inlet pipe and a bypass pipe. The lower opening of the spiral tube is connected to the water source inlet through the water inlet pipe, and the water inlet pipe is provided with a water inlet valve; one end of the bypass pipe is connected to the water source inlet, and the other end is connected to the connecting pipe, and the bypass pipe is provided with a bypass valve.

5. The energy-saving hot pot according to claim 1, characterized in that: It also includes an overheat protector and a temperature probe. The top plate is provided with a hot water inlet, and the outer side of the outer cylinder and the outer side of the top plate are provided with a heat preservation layer.

6. The energy-saving hot pot according to claim 1, characterized in that: The top plate has an upward convex shape and / or the bottom plate has a downward convex shape.

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