A multi-stage hot water supply device and a method of operating the same

Abstract

The present application relates to a kind of multistage hot water supply device and its operating method, comprising: heat charging module;First solid-state heat storage, the first solid-state heat storage is ringed in the outer circumferential side of heat charging module;Second solid-state heat storage, the second solid-state heat storage is ringed in the outer circumferential side of first solid-state heat storage;Third solid-state heat storage, the third solid-state heat storage is ringed in the outer circumferential side of second solid-state heat storage;Potable water pipe, the middle part of potable water pipe is contacted with first solid-state heat storage;Domestic water pipe, the middle part of domestic water pipe is contacted with second solid-state heat storage;Heating water pipe, the middle part of heating water pipe is contacted with third solid-state heat storage.

Description

Technical Field

[0001] This invention relates to the field of heating at supply stations in high-altitude and cold regions, and in particular to a multi-stage hot water supply device and its operation method. Background Technology

[0002] High-altitude and frigid regions are characterized by abundant photovoltaic and wind energy resources. Therefore, these renewable energy sources are typically used as the power supply for refueling stations in these areas, providing them with heating. However, photovoltaic and wind energy resources suffer from supply instability. Therefore, to ensure a consistent heating supply, these stations are also equipped with a power grid to supplement power during periods of insufficient photovoltaic and wind energy resources. Power grid supply is divided into peak and off-peak electricity, with peak electricity prices being higher and off-peak prices lower. However, in many cases, peak power periods coincide with periods of insufficient renewable energy, leading to higher costs for obtaining power from the grid and consequently higher overall heating costs for the refueling stations. Summary of the Invention

[0003] Therefore, it is necessary to provide a multi-stage hot water supply device and its operation method to address the problem of high heat supply costs at supply stations in high-altitude and cold regions.

[0004] A multi-stage hot water supply device, comprising:

[0005] Heating module;

[0006] The first solid-state thermal storage body is arranged around the outer periphery of the heat charging module;

[0007] The second solid thermal energy storage body is arranged around the outer periphery of the first solid thermal energy storage body;

[0008] The third solid thermal energy storage body is arranged around the outer periphery of the second solid thermal energy storage body;

[0009] A drinking water pipe, the middle portion of which is in contact with the first solid heat storage body;

[0010] A domestic water pipe, the middle part of which is in contact with the second solid heat storage body;

[0011] The heating water pipe has its middle section in contact with the third solid heat storage body.

[0012] In some embodiments of this application, the drinking water pipe includes, in the extension direction, a first inlet section, a first heating section and a first outlet section in sequence. The first heating section is in contact with the first solid heat storage body. The first inlet section and the first outlet section are located at the ends of the first solid heat storage body, so that the first inlet section and the first outlet section are spaced apart between the second solid heat storage body and the third solid heat storage body.

[0013] The domestic water pipe includes, in sequence, a second inlet section, a second heating section, and a second outlet section in the extending direction. The second heating section is in contact with the second solid heat storage body. The second inlet section and the second outlet section are located at the ends of the second solid heat storage body, so that the second inlet section and the second outlet section are spaced apart from the third solid heat storage body.

[0014] In some embodiments of this application, the heating water pipe includes, in sequence, a third inlet section, a third heating section, and a third outlet section in the extending direction, wherein the third heating section is in contact with the third solid heat storage body;

[0015] The first heating section, the second heating section, and the third heating section are spiral-shaped.

[0016] In some embodiments of this application, the multi-stage hot water supply device further includes a thermally conductive graphite tube sleeve, wherein the first heating section is located inside the first solid heat storage body, the second heating section is located outside the second solid heat storage body, the inner wall of the thermally conductive graphite tube sleeve is pressed against the outer wall of the first solid heat storage body, and the outer wall of the thermally conductive graphite tube sleeve is pressed against the inner wall of the second solid heat storage body.

[0017] In some embodiments of this application, the multi-stage hot water supply device further includes a heat-insulating ceramic tube sleeve, the second heating section is located between the outer wall of the second solid heat storage body and the inner wall of the heat-insulating ceramic tube sleeve, the outer wall of the heat-insulating ceramic tube sleeve is pressed against the inner wall of the third solid heat storage body, and the third heating section is located on the outside of the third solid heat storage body.

[0018] In some embodiments of this application, the multi-stage hot water supply device further includes an insulated outer shell, and the heat charging module, the first solid heat storage body, the thermally conductive graphite tube sleeve, the second solid heat storage body, the thermally insulated ceramic tube sleeve, the third solid heat storage body, the first heating section, the second heating section and the third heating section are located inside the insulated outer shell.

[0019] In some embodiments of this application, the domestic water pipe further includes a cold water branch pipe, the end of which is located on the side wall of the second water outlet section.

[0020] In some embodiments of this application, the first solid thermal storage body is a magnesium-iron-based thermal storage brick, a magnesium oxide thermal storage brick, or a ceramic thermal storage material; the second solid thermal storage body is an expanded graphite composite phase change material, a fatty acid phase change material, or a hydrated salt composite phase change material; and the third solid thermal storage body is a concrete-based sensible heat thermal storage material, a phase change concrete, or an inorganic thermal storage material.

[0021] A method for operating the aforementioned multi-stage hot water supply device includes:

[0022] Set the pipeline antifreeze temperature threshold Tc;

[0023] When the temperature T3 of the third solid heat storage body is less than Tc, the water flow rate in the drinking water pipe and / or the domestic water pipe is reduced.

[0024] In some embodiments of this application, the running method further includes:

[0025] Set the guaranteed temperature threshold Tb for domestic hot water and the guaranteed temperature threshold Ta for drinking hot water, where Ta > Tb > Tc;

[0026] When the temperature T2 of the second solid heat storage body is less than Tb, reduce the water flow rate in the drinking water pipe;

[0027] When the temperature T1 of the first solid heat storage body is less than Ta, the heat charging module is controlled to generate heat.

[0028] The beneficial effects of this invention are as follows:

[0029] When renewable energy is abundant, it can be used to power the charging module so that the charging module can continuously generate heat. The heat generated by the charging module is transferred sequentially to the first solid-state thermal storage body, the second solid-state thermal storage body, and the third solid-state thermal storage body, and this part of the heat will be stored by the first solid-state thermal storage body, the second solid-state thermal storage body, and the third solid-state thermal storage body.

[0030] Since the first, second, and third solid-state thermal storage bodies are arranged sequentially from the inside to the outside in the radial direction of the heat charging module, there is a natural temperature difference between them. The temperature of the first solid-state thermal storage body is higher than that of the second solid-state thermal storage body, and the temperature of the second solid-state thermal storage body is higher than that of the third solid-state thermal storage body.

[0031] If water flows through the drinking water pipe, it is heated by a first solid-state heat storage medium; if water flows through the domestic water pipe, it is heated by a second solid-state heat storage medium; and if water flows through the heating water pipe, it is heated by a third solid-state heat storage medium. Correspondingly, the water temperature in the drinking water pipe is higher than that in the domestic water pipe, and the domestic water temperature is higher than that in the heating water pipe. The high-temperature water in the drinking water pipe is suitable for drinking, the medium-temperature water in the domestic water pipe is suitable for handwashing or other daily needs, and the low-temperature water in the heating water pipe can be used to prevent freezing of the pipeline at the supply station or for heating radiators.

[0032] When renewable energy is insufficient, the first, second, and third solid-state thermal storage units can continue to provide drinking water, domestic hot water, antifreeze hot water, or heating hot water by releasing the remaining stored heat energy. This ensures that the refueling station can continue to meet its heating needs even when renewable energy is scarce. This effectively reduces the frequency and number of times the refueling station draws electricity from the grid, thus meeting its heating needs at a lower cost. Attached Figure Description

[0033] Figure 1 This is a cross-sectional structural diagram of the multi-stage hot water supply device in an embodiment of the present invention;

[0034] Figure 2 This is a top view of the multi-stage hot water supply device in an embodiment of the present invention.

[0035] Figure label:

[0036] 1. Heat charging module; 2. First solid-state heat storage body; 3. Second solid-state heat storage body; 4. Third solid-state heat storage body; 5. Drinking water pipe; 6. Domestic water pipe; 7. Heating water pipe; 8. Thermally conductive graphite tube sleeve; 9. Thermally insulated ceramic tube sleeve; 10. Thermal insulation shell. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] Example:

[0044] like Figure 1 and Figure 2 As shown, this embodiment provides a multi-stage hot water supply device, including a heat charging module 1, a first solid heat storage body 2, a second solid heat storage body 3, a third solid heat storage body 4, a drinking water pipe 5, a domestic water pipe 6, and a heating water pipe 7.

[0045] The heat charging module 1 can be, for example, a heating resistor, which can obtain electrical energy and generate heat through photovoltaic modules, wind power modules, or the power grid. The heat charging module 1 can be, for example, rod-shaped, while the first solid-state heat storage body 2, the second solid-state heat storage body 3, and the third solid-state heat storage body 4 can be, for example, tubular. The heat charging module 1 is inserted through the middle of the first solid-state heat storage body 2, so that the first solid-state heat storage body 2 is arranged around the outer periphery of the heat charging module 1. The first solid-state heat storage body 2 is inserted through the middle of the second solid-state heat storage body 3, so that the second solid-state heat storage body 3 is arranged around the outer periphery of the first solid-state heat storage body 2. The second solid-state heat storage body 3 is inserted through the middle of the third solid-state heat storage body 4, so that the third solid-state heat storage body 4 is arranged around the outer periphery of the second solid-state heat storage body 3. Thus, in the radial direction of the heat charging module 1, the heat charging module 1, the first solid-state heat storage body 2, the second solid-state heat storage body 3, and the third solid-state heat storage body 4 are arranged sequentially from the inside to the outside.

[0046] When the heating module 1 receives electrical energy, the heat generated is first transferred to the first solid-state heat storage body 2, causing its temperature to rise and storing the heat. As the temperature of the first solid-state heat storage body 2 rises, it transfers some of the heat to the second solid-state heat storage body 3, causing its temperature to rise and storing the heat. As the temperature of the second solid-state heat storage body 3 rises, it transfers some of the heat to the third solid-state heat storage body 4, causing its temperature to rise and storing the heat. In other words, there is a natural temperature difference between the first solid-state heat storage body 2, the second solid-state heat storage body 3, and the third solid-state heat storage body 4, where the temperature of the first solid-state heat storage body 2 is higher than that of the second solid-state heat storage body 3, and the temperature of the second solid-state heat storage body 3 is higher than that of the third solid-state heat storage body 4.

[0047] For example, the first solid heat storage body 2 is a magnesium-iron-based heat storage brick, a magnesium oxide heat storage brick, a high-temperature molten salt composite heat storage material, or a high thermal conductivity ceramic heat storage material, with an operating temperature range of 120℃-260℃ and a thermal conductivity preferably of 1.5W / (m·K)-8W / (m·K); the second solid heat storage body 3 is an expanded graphite composite phase change material, a fatty acid phase change material, or a crystalline hydrated salt composite phase change material, with an operating temperature range of 50℃-150℃ and a thermal conductivity preferably of 0.5W / (m·K)-5W / (m·K); the third solid heat storage body 4 is a concrete-based sensible heat heat storage material, a phase change concrete, a low-temperature phase change composite material, or a high heat capacity inorganic heat storage material, with an operating temperature range of 35~90℃.

[0048] The drinking water pipe 5 has its middle section in contact with the first solid-state heat storage body 2, the domestic water pipe 6 has its middle section in contact with the second solid-state heat storage body 3, and the heating water pipe 7 has its middle section in contact with the third solid-state heat storage body 4. After the first solid-state heat storage body 2, the second solid-state heat storage body 3, and the third solid-state heat storage body 4 have finished storing heat, if water is introduced into the drinking water pipe 5, the water in the drinking water pipe 5 can be heated through the first solid-state heat storage body 2; if water is introduced into the domestic water pipe 6, the water in the domestic water pipe 6 can be heated through the second solid-state heat storage body 3; and if water is introduced into the heating water pipe 7, the water in the heating water pipe 7 can be heated through the third solid-state heat storage body 4.

[0049] Correspondingly, the water temperature in drinking water pipe 5 is higher than that in domestic water pipe 6, which in turn is higher than that in heating water pipe 7. The high-temperature water in drinking water pipe 5 is safe for drinking because it has already been sterilized by the high temperature. In some other embodiments, a temperature-regulating valve can be installed at the outlet of drinking water pipe 5 to prevent scalding from the hot water. The medium-temperature water in domestic water pipe 6 is suitable for handwashing or other daily needs. The low-temperature water in heating water pipe 7 can be used to prevent freezing of pipes at the supply station or to heat radiators, thereby improving the heating supply at the station. Thus, the multi-stage hot water supply device of this embodiment can meet the basic heat supply needs of supply stations in high-altitude and cold regions.

[0050] High-altitude and cold regions possess abundant renewable energy resources (photovoltaic and wind power). However, these renewable energy sources are severely affected by weather, seasons, and other factors, exhibiting significant volatility. When renewable energy is abundant, the heat-charging module 1 can continuously obtain electricity from these sources to continuously heat the first solid-state thermal storage body 2, the second solid-state thermal storage body 3, and the third solid-state thermal storage body 4 until they are fully heated or the renewable energy supply begins to decrease. When renewable energy is insufficient, the first solid-state thermal storage body 2, the second solid-state thermal storage body 3, and the third solid-state thermal storage body 4 can release the remaining stored heat energy to continue providing drinking water, domestic hot water, antifreeze hot water, or heating hot water, thus ensuring the supply station meets its heating needs even when renewable energy is insufficient. This effectively reduces the frequency and number of times the supply station draws electricity from the grid, thereby meeting the supply station's heating needs for a longer period at a lower cost.

[0051] It is easy to understand that only under the extreme condition of a long-term shortage of renewable energy and the exhaustion of heat from the first solid thermal storage body 2, the second solid thermal storage body 3, and the third solid thermal storage body 4, will the charging module 1 need to obtain electrical energy from the grid to charge the first solid thermal storage body 2, the second solid thermal storage body 3, and the third solid thermal storage body 4.

[0052] In this embodiment, the drinking water pipe 5 includes, in sequence, a first inlet section, a first heating section, and a first outlet section in its extension direction. The first heating section is in contact with the first solid-state heat storage body 2, allowing the first solid-state heat storage body 2 to heat the water flow within the first heating section. The first inlet section and the first outlet section are located at the ends of the first solid-state heat storage body 2, allowing them to be spaced apart from the second solid-state heat storage body 3 and the third solid-state heat storage body 4. This prevents the water flow in the drinking water pipe 5 from experiencing a temperature drop due to heat exchange with the second solid-state heat storage body 3 and the third solid-state heat storage body 4, ensuring the temperature of the hot water for drinking.

[0053] The domestic water pipe 6 includes, in its extension direction, a second inlet section, a second heating section, and a second outlet section. The second heating section is in contact with the second solid-state heat storage body 3, allowing the second solid-state heat storage body 3 to heat the water flow within the second heating section. The second inlet section and the second outlet section are located at the ends of the second solid-state heat storage body 3, allowing the second inlet section and the second outlet section to be spaced apart from the third solid-state heat storage body 4. This prevents the water flow in the domestic water pipe 6 from experiencing a temperature drop due to heat exchange with the third solid-state heat storage body 4, ensuring normal hot water supply for domestic use.

[0054] The heating water pipe 7 includes a third inlet section, a third heating section and a third outlet section in sequence in the extension direction. The third heating section is in contact with the third solid heat storage body 4 so that the third solid heat storage body 4 heats the water flow in the third heating section.

[0055] Preferably, the first heating section, the second heating section, and the third heating section are all spiral-shaped. This can extend the contact time between the water flow in the first heating section and the first solid heat storage body 2, the contact time between the water flow in the second heating section and the second solid heat storage body 3, and the contact time between the water flow in the third heating section and the third solid heat storage body 4. This ensures that the water flow output from the drinking water pipe 5, the domestic water pipe 6, and the heating water pipe 7 can be fully heated, so that the output temperature can meet the requirements of their respective usage scenarios.

[0056] In supply stations in high-altitude and cold regions, the demand for domestic hot water far exceeds the demand for drinking hot water. Therefore, the heat consumption rate of the first solid-state heat storage body 2 is much lower than that of the second solid-state heat storage body 3. This results in the temperature of the second solid-state heat storage body 3 decreasing faster than that of the first solid-state heat storage body 2. In this situation, it is necessary for the first solid-state heat storage body 2 to quickly transfer some of its heat to the second solid-state heat storage body 3 to prevent the temperature of the second solid-state heat storage body 3 from dropping too rapidly, thereby ensuring the output temperature of domestic hot water.

[0057] Based on the above reasons, the multi-stage hot water supply device in this embodiment also includes a thermally conductive graphite tube sleeve 8. The thermally conductive graphite tube sleeve 8 is tubular, with the first solid heat storage body 2 passing through the middle of the thermally conductive graphite tube sleeve 8 and the thermally conductive graphite tube sleeve 8 passing through the middle of the second solid heat storage body 3. The first heating section is located inside the first solid heat storage body 2 and contacts its inner wall, while the second heating section is located outside the second solid heat storage body 3 and contacts its outer wall. Thus, the inner wall of the thermally conductive graphite tube sleeve 8 is pressed against the outer wall of the first solid heat storage body 2, and the outer wall of the thermally conductive graphite tube sleeve 8 is pressed against the inner wall of the second solid heat storage body 3. Because the thermally conductive graphite tube sleeve 8 has a certain degree of elasticity, it can effectively reduce the air gap between the first solid heat storage body 2 and the second solid heat storage body 3. Furthermore, the excellent thermal conductivity of the thermally conductive graphite tube sleeve 8 itself facilitates rapid heat conduction from the first solid heat storage body 2 to the second solid heat storage body 3.

[0058] On the other hand, the water temperature required for pipe antifreeze or radiator heating is much lower than the domestic water temperature. Therefore, the temperature of the third solid heat storage body 4 can be much lower than the temperature of the second solid heat storage body 3, so that as much heat as possible can be used for heating domestic hot water.

[0059] Based on the above objectives, the multi-stage hot water supply device in this embodiment further includes an insulated ceramic tube sleeve 9. The second solid heat storage body 3 is inserted through the middle of the insulated ceramic tube sleeve 9, and the insulated ceramic tube sleeve 9 is inserted through the middle of the third solid heat storage body 4. The second heating section is located between the outer wall of the second solid heat storage body 3 and the inner wall of the insulated ceramic tube sleeve 9. The outer wall of the insulated ceramic tube sleeve 9 is pressed against the inner wall of the third solid heat storage body 4. The insulated ceramic tube sleeve 9 can limit the heat transfer rate from the second solid heat storage body 3 to the third solid heat storage body 4, thereby increasing the temperature difference between the second solid heat storage body 3 and the third solid heat storage body 4. The third heating section is located outside the third solid heat storage body 4, which can prevent the third heating section from directly obtaining heat from the second solid heat storage body 3 and reduce heat waste.

[0060] Furthermore, the multi-stage hot water supply device in this embodiment also includes an insulated outer shell 10, and the heat charging module 1, the first solid heat storage body 2, the thermally conductive graphite tube sleeve 8, the second solid heat storage body 3, the thermally insulated ceramic tube sleeve 9, the third solid heat storage body 4, the first heating section, the second heating section, and the third heating section are located inside the insulated outer shell 10. The insulated outer shell 10 can reduce the leakage and loss of heat stored in the first solid heat storage body 2, the second solid heat storage body 3, and the third solid heat storage body 4.

[0061] In some other embodiments, the domestic water pipe 6 also includes a cold water branch pipe, the end of which is located on the side wall of the second outlet section. When the water temperature in the second heating section is too high, it can be mixed with the cold water in the cold water branch pipe to appropriately reduce the temperature of the domestic water finally output from the second outlet section, ensuring that the domestic water output from the second outlet section is usable by personnel.

[0062] Based on the above-mentioned multi-stage hot water supply device, this embodiment further provides an operation method for the multi-stage hot water supply device, including the following steps:

[0063] Step 101: Set the drinking hot water guaranteed temperature threshold Ta, the domestic hot water guaranteed temperature threshold Tb, the pipeline antifreeze temperature threshold Tc, and the pipeline antifreeze temperature warning value Td, where Ta > Tb > Tc > Td;

[0064] Step 102: When the temperature Td of the third solid heat storage body 4 is less than T3 and less than Tc, it indicates that the heating effect of the third solid heat storage body 4 on the water flow in the heating water pipe 7 may be insufficient. This may cause the pipeline to freeze or the internal temperature of the supply station to be too low, thereby affecting the normal operation of the supply station. At this time, the water flow rate in the drinking water pipe 5 and / or the domestic water pipe 6 can be reduced, thereby directly or indirectly enhancing the heat transfer from the second solid heat storage body 3 to the third solid heat storage body 4, thereby increasing the temperature of the third solid heat storage body 4 and ensuring the normal operation of the supply station.

[0065] Step 103: When the temperature T3 of the third solid heat storage body 4 is less than Td, it indicates that the heating effect of the third solid heat storage body 4 on the water flow in the heating water pipe 7 is seriously insufficient, and the supply station is in a critical state. At this time, it is necessary to make the supply station heat up quickly.

[0066] There are two main ways to rapidly heat up the supply station: First, stop supplying water to the drinking water pipe 5 and the domestic water pipe 6, so that as much heat stored in the first solid-state thermal storage body 2 and the second solid-state thermal storage body 3 as possible can be transferred to the third solid-state thermal storage body 4, so that the temperature of the third solid-state thermal storage body 4 can rise above Td; Second, use the water flow in the drinking water pipe 5 and / or the domestic water pipe 6 for pipe antifreeze and radiator heating.

[0067] Step 104: When the temperature T2 of the second solid heat storage body 3 is less than Tb, it indicates that the heating effect of the second solid heat storage body 3 on the domestic water in the domestic water pipe 6 is insufficient. As mentioned above, the demand for domestic water is much greater than the demand for drinking hot water. Therefore, the water flow rate in the drinking water pipe 5 can be appropriately reduced to promote the heat transfer from the first solid heat storage body 2 to the second solid heat storage body 3.

[0068] Step 105: When the temperature T1 of the first solid heat storage body 2 is less than Ta, it indicates that the temperatures of the second solid heat storage body 3 and the third solid heat storage body 4 are likely insufficient to meet the needs of domestic water and pipeline antifreeze. The heat storage capacity of the first solid heat storage body 2, the second solid heat storage body 3 and the third solid heat storage body 4 is insufficient. Therefore, the water supply to the drinking water pipe 5, the domestic water pipe 6 and the heating water pipe 7 can be temporarily stopped. Then, the heat charging module 1 is controlled to generate heat, thereby starting to charge the first solid heat storage body 2, the second solid heat storage body 3 and the third solid heat storage body 4.

[0069] In some embodiments, supply stations in high-altitude and cold regions can be equipped with two or more of the aforementioned multi-stage hot water supply devices. The two multi-stage hot water supply devices can take turns heating, thereby ensuring that the supply station can always operate normally and minimize the demand for power from the power grid.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A multi-stage hot water supply device, characterized in that, include: Heat charging module (1); The first solid-state thermal storage body (2) is arranged around the outer periphery of the heat charging module (1); The second solid thermal energy storage body (3) is arranged around the outer periphery of the first solid thermal energy storage body (2); The third solid thermal energy storage body (4) is arranged around the outer periphery of the second solid thermal energy storage body (3); Drinking water pipe (5), the middle part of which is in contact with the first solid heat storage body (2); Domestic water pipe (6), the middle part of which is in contact with the second solid heat storage body (3); The heating water pipe (7) has its middle part in contact with the third solid heat storage body (4).

2. The multi-stage hot water supply device according to claim 1, characterized in that, The drinking water pipe (5) includes a first inlet section, a first heating section and a first outlet section in sequence in the extension direction. The first heating section is in contact with the first solid heat storage body (2). The first inlet section and the first outlet section are located at the ends of the first solid heat storage body (2) so that the first inlet section and the first outlet section are spaced apart between the second solid heat storage body (3) and the third solid heat storage body (4). The domestic water pipe (6) includes a second inlet section, a second heating section and a second outlet section in sequence in the extension direction. The second heating section is in contact with the second solid heat storage body (3). The second inlet section and the second outlet section are located at the ends of the second solid heat storage body (3) so that the second inlet section and the second outlet section are spaced apart from the third solid heat storage body (4).

3. The multi-stage hot water supply device according to claim 2, characterized in that, The heating water pipe (7) includes a third inlet section, a third heating section and a third outlet section in sequence in the extension direction. The third heating section is in contact with the third solid heat storage body (4). The first heating section, the second heating section, and the third heating section are spiral-shaped.

4. The multi-stage hot water supply device according to claim 3, characterized in that, The multi-stage hot water supply device also includes a thermally conductive graphite tube sleeve (8), the first heating section is located inside the first solid heat storage body (2), the second heating section is located outside the second solid heat storage body (3), the inner wall of the thermally conductive graphite tube sleeve (8) is pressed against the outer wall of the first solid heat storage body (2), and the outer wall of the thermally conductive graphite tube sleeve (8) is pressed against the inner wall of the second solid heat storage body (3).

5. The multi-stage hot water supply device according to claim 4, characterized in that, The multi-stage hot water supply device also includes a heat-insulating ceramic tube sleeve (9), the second heating section is located between the outer wall of the second solid heat storage body (3) and the inner wall of the heat-insulating ceramic tube sleeve (9), the outer wall of the heat-insulating ceramic tube sleeve (9) is pressed against the inner wall of the third solid heat storage body (4), and the third heating section is located on the outside of the third solid heat storage body (4).

6. The multi-stage hot water supply device according to claim 5, characterized in that, The multi-stage hot water supply device also includes an insulated shell (10), the heat charging module (1), the first solid heat storage body (2), the thermally conductive graphite tube sleeve (8), the second solid heat storage body (3), the thermally insulated ceramic tube sleeve (9), the third solid heat storage body (4), the first heating section, the second heating section and the third heating section are located inside the insulated shell (10).

7. The multi-stage hot water supply device according to claim 2, characterized in that, The domestic water pipe (6) also includes a cold water branch pipe, the end of which is located on the side wall of the second water outlet section.

8. The multi-stage hot water supply device according to claim 1, characterized in that, The first solid heat storage body (2) is a magnesium iron-based heat storage brick, a magnesium oxide heat storage brick or a ceramic heat storage material; the second solid heat storage body (3) is an expanded graphite composite phase change material, a fatty acid phase change material or a hydrated salt composite phase change material; and the third solid heat storage body (4) is a concrete-based sensible heat storage material, a phase change concrete or an inorganic heat storage material.

9. A method for operating a multi-stage hot water supply device as described in any one of claims 1-8, characterized in that, include: Set the pipeline antifreeze temperature threshold Tc; When the temperature T3 of the third solid heat storage body (4) is less than Tc, the water flow rate in the drinking water pipe (5) and / or the domestic water pipe (6) is reduced.

10. The operation method of the multi-stage hot water supply device according to claim 9, characterized in that, The operating method further includes: Set the guaranteed temperature threshold Tb for domestic hot water and the guaranteed temperature threshold Ta for drinking hot water, where Ta > Tb > Tc; When the temperature T2 of the second solid heat storage body (3) is less than Tb, the water flow rate in the drinking water pipe (5) is reduced; When the temperature T1 of the first solid heat storage body (2) is less than Ta, the heat charging module (1) is controlled to generate heat.

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