Vacuum glass tube solar water heater with internal circulation heat exchange tube

Abstract

The invention discloses a vacuum glass tube solar water heater with an internal circulation heat exchange tube, which relates to the field of solar heat utilization, and comprises an energy storage water tank, a heat insulation box, an internal circulation heat exchange tube, a heat exchange tube and a heat exchange tube, the multiple vacuum glass tubes are arranged on the two sides of the heat preservation box, the multiple vacuum glass tubes are arranged at equal intervals from top to bottom, and the vacuum glass tubes are fixedly connected with the outer side of the heat preservation box; according to the vacuum glass tube solar water heater with the internal circulation heat exchange tubes, the bottom-layer vacuum glass tubes are transversely communicated through the first flow guide tubes, the top-layer vacuum glass tubes are transversely communicated through the second flow guide tubes, and the longitudinally adjacent vacuum glass tubes are connected in series through the first communication guide tubes; the high-temperature water rises and the low-temperature water sinks according to the natural convection principle driven by temperature difference, so that the water flow exchange speed between the vacuum glass tubes and on the left and right sides of the vacuum glass tubes on the same layer is accelerated, the water temperature in the system rises faster and more uniformly, and the heat efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to solar heat utilization technology, in particular to a vacuum glass tube solar water heater with an internal circulation heat exchange tube. Background Art

[0002] Traditional vacuum glass tube solar water heaters often face several key challenges during operation. First, the structure of a single row of vacuum glass tubes in series results in an overly long water flow path, low heat exchange efficiency, and slow water temperature rise. Second, due to uneven heating, local water temperatures are prone to being too high or too low inside the vacuum glass tubes, making it difficult for high-temperature water to quickly and effectively participate in the system circulation. Furthermore, when users need to take hot water, if they take water directly from the energy storage tank, the insufficiently heated cold water will easily mix with the hot water, resulting in the outlet water temperature not reaching the ideal value, affecting the user experience. In addition, existing systems usually lack flexible operating mode switching functions, making it difficult to easily switch between the three states of heating, taking hot water, and replenishing cold water. Additional complex piping and valve arrangements are often required, increasing costs and the risk of failure. Finally, the connecting pipes are exposed to the environment and lack effective insulation, resulting in large heat losses and reducing the overall energy efficiency of the system. Summary of the Invention

[0003] The object of the present invention is to provide a vacuum glass tube solar water heater with an internal circulation heat exchange tube to solve the above-mentioned deficiencies in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an evacuated glass tube solar water heater with an internal circulation heat exchange tube, comprising an energy storage water tank and:

[0005] An insulation box, which is arranged on one side of the energy storage water tank;

[0006] A plurality of vacuum glass tubes are provided on both sides of the heat preservation box, the vacuum glass tubes are arranged equidistantly from top to bottom, and the vacuum glass tubes are fixedly connected to the outside of the heat preservation box;

[0007] A first flow guide tube, which is used to connect the two symmetrically arranged vacuum glass tubes located below, with both ends of the first flow guide tube located at the bottom of the inner cavity of the vacuum glass tube;

[0008] A second flow guide tube is used to connect the two vacuum glass tubes symmetrically arranged above, with both ends of the second flow guide tube located at the top of the inner cavity of the vacuum glass tube;

[0009] A longitudinal connecting unit is provided between two adjacent vacuum glass tubes in the same longitudinal direction, the longitudinal connecting unit being used to connect the inner cavities of the two adjacent vacuum glass tubes in the longitudinal direction, the top end of the longitudinal connecting unit being located at the bottom of the inner cavity of the upper vacuum glass tube, and the bottom end of the longitudinal connecting unit being located at the top of the inner cavity of the lower vacuum glass tube;

[0010] The water injection pipe is used to connect the energy storage water tank and the first guide pipe, and the water injection pipe is used to inject the water in the energy storage water tank into the inner cavity of the first guide pipe.

[0011] Furthermore, both ends of the first flow guide tube pass through the insulation box, the outer side of the first flow guide tube is fixedly connected to the insulation box at the penetration point, and both ends of the first flow guide tube extend to the side of the vacuum glass tube cavity away from the insulation box.

[0012] Furthermore, both ends of the second flow guide tube pass through the insulation box, the outer side of the second flow guide tube is fixedly connected to the insulation box at the penetration point, and the two ends of the second flow guide tube are respectively located on one side of the vacuum glass tube cavity close to the insulation box.

[0013] Furthermore, the longitudinal connecting unit is a first connecting conduit, the top length of the first connecting conduit is greater than the bottom length, the two ends of the first connecting conduit respectively penetrate the side wall of the insulation box and extend to the two longitudinally adjacent vacuum glass tube cavities, the top of the first connecting conduit is located at the bottom of the upper vacuum glass tube cavity, the top opening of the first connecting conduit is located on the side of the vacuum glass tube cavity away from the insulation box, the bottom end of the first connecting conduit is located in the lower vacuum glass tube cavity, and the bottom opening of the first connecting conduit is located on the side of the lower vacuum glass tube cavity close to the insulation box.

[0014] Furthermore, a flow pipe is fixedly connected to the outside of the second flow guide pipe, the other end of the flow pipe is fixedly connected to the energy storage water tank, and the inner cavity of the flow pipe is communicated with the inner cavity of the second flow guide pipe.

[0015] Furthermore, the second flow guide pipe is also connected to the water outlet pipe. The second flow guide pipe, the circulation pipe and the water outlet pipe are arranged in a cross-shaped cross-connection. A solenoid valve is fixedly installed at the intersection. The solenoid valve is used to control the connection between the second flow guide pipe, the circulation pipe and the inner cavity of the water outlet pipe.

[0016] Furthermore, one end of the water injection pipe is fixedly connected to the outside of the first flow guide pipe, the inner cavity of the first flow guide pipe is communicated with the inner cavity of the water injection pipe, the water injection pipe passes through the side wall of the insulation box, the outer side of the water injection pipe is fixedly connected to the penetration point of the insulation box, and the water injection pipe is also connected to a water pump, which is used to inject the water in the energy storage water tank into the vacuum glass tube through the first flow guide pipe.

[0017] Furthermore, the inner side of the thermal insulation box is covered with thermal insulation cotton.

[0018] Compared with the prior art, the present invention provides a vacuum glass tube solar water heater with an internal circulation heat exchange tube. The bottom vacuum glass tubes are connected horizontally through the first guide tube, the top vacuum glass tubes are connected horizontally through the second guide tube, and the vertically adjacent vacuum glass tubes are connected in series through the first connecting conduit. The natural convection principle driven by temperature difference is used to make high-temperature water rise and low-temperature water sink, thereby accelerating the water flow exchange speed between the vacuum glass tubes and the left and right sides of the vacuum glass tubes on the same layer, so that the water temperature inside the system rises faster and more evenly, and the thermal efficiency is significantly improved. In terms of water intake, by setting a high temperature on the top floor, The second guide pipe in the low-temperature area and the outlet pipe connected to it, together with the solenoid valve control, can directly draw hot water from the area with the highest water temperature. The system is also highly integrated. Only a solenoid valve needs to be set at the intersection of the second guide pipe, the circulation pipe and the outlet pipe to switch between three working modes: only keep the internal circulation unobstructed during heating; connect the high-temperature area and the outlet pipe when taking water; connect the external water source and the energy storage tank when replenishing water, which simplifies the interface of the pipeline layout, reduces the risk of leakage and maintenance cost, and mainly relies on natural circulation during operation without additional power. It can still maintain effective circulation under low radiation conditions such as cloudy days. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0021] Figure 2 A schematic cross-sectional view of the overall structure provided by an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of a first communicating conduit provided in an embodiment of the present invention;

[0023] Figure 4 A first schematic diagram of a local structure provided by an embodiment of the present invention;

[0024] Figure 5 A second schematic diagram of a partial structure provided by an embodiment of the present invention;

[0025] Figure 6 This is a schematic structural diagram of a second connecting conduit provided in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Vacuum glass tube; 2. Insulation box; 3. Energy storage water tank; 4. Water injection pipe; 5. First guide pipe; 6. Circulation pipe; 7. First connecting duct; 8. Second guide pipe; 9. Solenoid valve; 10. Water outlet pipe; 11. Second connecting duct. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Example 1:

[0030] See also Figure 1-Figure 5 , a vacuum glass tube solar water heater with an internal circulation heat exchange tube, including an energy storage water tank 3, and also including:

[0031] The heat preservation box 2 is arranged on one side of the energy storage water tank 3;

[0032] A plurality of vacuum glass tubes 1 are arranged on both sides of the heat preservation box 2, and the vacuum glass tubes 1 are arranged equidistantly from top to bottom, and the vacuum glass tubes 1 are fixedly connected to the outside of the heat preservation box 2;

[0033] A first flow guide tube 5 is used to connect the two symmetrically arranged vacuum glass tubes 1 below, with both ends of the first flow guide tube 5 located at the bottom of the inner cavity of the vacuum glass tube 1;

[0034] A second flow guide tube 8 is used to connect the two vacuum glass tubes 1 symmetrically arranged above, with both ends of the second flow guide tube 8 located at the top of the inner cavity of the vacuum glass tube 1;

[0035] A longitudinal communication unit is provided between two adjacent vacuum glass tubes 1 in the same longitudinal direction. The longitudinal communication unit is used to connect the inner cavities of the two adjacent vacuum glass tubes 1 in the longitudinal direction. The top end of the longitudinal communication unit is located at the bottom of the inner cavity of the upper vacuum glass tube 1, and the bottom end of the longitudinal communication unit is located at the top of the inner cavity of the lower vacuum glass tube 1.

[0036] The water injection pipe 4 is used to connect the energy storage water tank 3 and the first flow guide pipe 5 . The water injection pipe 4 is used to inject the water in the energy storage water tank 3 into the inner cavity of the first flow guide pipe 5 .

[0037] Water is stored in the energy storage tank 3. The first guide pipe 5 is used to connect the inner cavities of the two vacuum glass tubes 1 on the bottom layer and allow the liquid in the vacuum glass tube 1 on one side to flow into the other side. The second guide pipe 8 is used to connect the inner cavities of the two vacuum glass tubes 1 on the top layer and allow the mutual circulation of liquid. The water injection pipe 4 is used to inject liquid into the vacuum glass tube 1. When the liquid in all the vacuum glass tubes 1 is filled, the vacuum glass tube 1 absorbs the heat from the sunlight, and the liquid therein absorbs heat and heats up. When there is a temperature difference between the liquids in the vacuum glass tube 1, the density of the liquid with a higher temperature is lower than that of the liquid with a lower temperature, so it stays in the upper layer of the inner cavity of the vacuum glass tube 1. The liquid continues to absorb heat and expands in volume, but the vacuum glass tubes 1 on different layers are affected by sunlight. The areas irradiated by the line are different, so the temperatures of the liquids in different vacuum glass tubes 1 are also different. After the temperature of the liquid is uneven and the volume changes, when the liquid in the uppermost vacuum glass tube 1 flows, the liquid with a relatively low temperature flows into the vacuum glass tube 1 below through the top of the longitudinal connecting unit on one side, and the liquid with a relatively high temperature in the vacuum glass tube 1 at the same height flows in through the second guide tube 8 for replenishment. The liquid with a relatively low temperature flows downward step by step through the longitudinal connecting unit, and the pressure difference formed causes the liquid with a relatively high temperature at the bottom to be replenished into the vacuum glass tube 1 above through the longitudinal connecting unit. The two vacuum glass tubes 1 at the bottom circulate through the first guide tube 5, so that the temperature of the liquid in all vacuum glass tubes 1 is uniform.

[0038] Both ends of the first flow guide tube 5 pass through the insulation box 2 , and the outer side of the first flow guide tube 5 is fixedly connected to the insulation box 2 at the penetration point. Both ends of the first flow guide tube 5 extend to the side of the inner cavity of the vacuum glass tube 1 away from the insulation box 2 .

[0039] The first flow guide pipe 5 is used to provide a passage for the liquid in the water injection pipe 4 to be replenished into the vacuum glass tube 1 , and also provides a path for the circulation and exchange of liquid in the two lowest vacuum glass tubes 1 .

[0040] Both ends of the second flow guide tube 8 pass through the insulation box 2 , and the outer side of the second flow guide tube 8 is fixedly connected to the insulation box 2 at the penetration point. The two ends of the second flow guide tube 8 are respectively located on one side of the inner cavity of the vacuum glass tube 1 close to the insulation box 2 .

[0041] The second flow guide tube 8 provides a path for the flow of liquid in the inner cavities of the two uppermost vacuum glass tubes 1;

[0042] The longitudinal connecting unit is a first connecting conduit 7. The length of the top end of the first connecting conduit 7 is greater than the length of the bottom end. The two ends of the first connecting conduit 7 respectively penetrate the side wall of the insulation box 2 and extend to the inner cavities of two longitudinally adjacent vacuum glass tubes 1. The top end of the first connecting conduit 7 is located at the bottom of the inner cavity of the vacuum glass tube 1 above. The top opening of the first connecting conduit 7 is located on the side of the inner cavity of the vacuum glass tube 1 away from the insulation box 2. The bottom end of the first connecting conduit 7 is located in the inner cavity of the vacuum glass tube 1 below. The bottom opening of the first connecting conduit 7 is located on the side of the inner cavity of the lower vacuum glass tube 1 close to the insulation box 2.

[0043] The first connecting conduit 7 is used to connect the inner cavities of two upper and lower adjacent vacuum glass tubes 1;

[0044] A flow pipe 6 is fixedly connected to the outside of the second flow guiding pipe 8 , and the other end of the flow pipe 6 is fixedly connected to the energy storage water tank 3 . The inner cavity of the flow pipe 6 is communicated with the inner cavity of the second flow guiding pipe 8 .

[0045] The second flow guide pipe 8 is also connected to the water outlet pipe 10. The second flow guide pipe 8, the circulation pipe 6 and the water outlet pipe 10 are arranged in a cross shape and connected to each other. A solenoid valve 9 is fixedly installed at the intersection. The solenoid valve 9 is used to control the communication between the inner cavities of the second flow guide pipe 8, the circulation pipe 6 and the water outlet pipe 10.

[0046] The solenoid valve 9 is used to control the connection or interruption between the inner cavities of the second flow guide pipe 8, the circulation pipe 6 and the water outlet pipe 10. When in the heating stage, the solenoid valve 9 cuts off the circulation pipe 6 and the water outlet pipe 10, and only keeps the internal channel of the second flow guide pipe 8 unobstructed, and the liquid circulates between the two vacuum glass tubes 1 located at the top. When it is necessary to take out the liquid from the vacuum glass tube 1, the solenoid valve 9 controls the second flow guide pipe 8 to be connected with the water outlet pipe 10, and the water in the vacuum glass tube 1 is pumped out through the water outlet pipe 10 by an external water pump. When it is necessary to replenish liquid into the energy storage water tank 3, the solenoid valve 9 controls the water outlet pipe 10 to be connected with the circulation pipe 6, and the liquid is replenished into the energy storage water tank 3 through the water outlet pipe 10 and the circulation pipe 6 by the external water pump;

[0047] One end of the water injection pipe 4 is fixedly connected to the outside of the first guide pipe 5, the inner cavity of the first guide pipe 5 is connected to the inner cavity of the water injection pipe 4, the water injection pipe 4 passes through the side wall of the insulation box 2, and the outer side of the water injection pipe 4 is fixedly connected to the insulation box 2 where it passes through. The water injection pipe 4 is also connected to a water pump, which is used to inject the water in the energy storage water tank 3 into the vacuum glass tube 1 through the first guide pipe 5.

[0048] The water pump extracts the liquid in the energy storage tank 3 and injects it into the first guide pipe 5 through the water injection pipe 4 to replenish the liquid into the vacuum glass tube 1;

[0049] The inner side of the heat preservation box 2 is covered with heat insulation cotton.

[0050] The heat-insulating cotton wrapped on the inner side of the heat-insulating box 2 is used to keep the pipes inside it warm.

[0051] Example 2:

[0052] See also Figure 6 This embodiment provides a technical solution based on the first embodiment: the longitudinal communication unit is a second communication conduit 11, and a plurality of flow holes are opened through the top of the second communication conduit 11. The liquid in the inner cavity of the vacuum glass tube 1 is exchanged through the flow holes.

[0053] Working Principle: When in use, the water in the energy storage tank 3 is driven by a water pump and injected into the first guide tube 5 at the bottom through the water injection pipe 4, and then fills all the vacuum glass tubes 1, the first connecting pipes 7 longitudinally connecting adjacent vacuum glass tubes, and the second guide tube 8 at the top in sequence. The vacuum glass tubes 1 absorb the heat from the sun to heat the water inside. Due to the uneven heating and the thermal expansion and contraction characteristics of water, the water temperature in each vacuum glass tube 1 varies and forms a natural stratification: the water with higher temperature and lower density rises to the top, while the water with lower temperature and higher density sinks to the bottom. This temperature difference drives the natural circulation of the entire system, which is specifically manifested as follows: The relatively cooler water at the bottom of the topmost vacuum glass tube 1 flows downward under gravity through the first connecting conduit 7 below it into the adjacent vacuum glass tube 1 in the lower layer. Simultaneously, the relatively hotter water at the top of the adjacent vacuum glass tube 1 in the same layer flows laterally through the second conduit 8 at the top, replenishing the upper vacuum glass tube, whose water level has dropped due to the outflow of cold water. The warmer water, heated and rising in the lower vacuum glass tube 1, flows upward through the bottom opening of the corresponding first connecting conduit 7 in that layer, replenishing the upper vacuum glass tube 1. Water exchange occurs laterally between the two vacuum glass tubes 1 in the bottom layer via the first conduit 5. This continuous water exchange, both longitudinally through the first connecting conduit 7 and laterally through the first or second conduit 8 in the same layer, gradually evens out the water temperature within the system. The insulation box 2 and its inner insulation effectively reduce heat loss in the connecting pipes.

[0054] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

[0055] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0056] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0057] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0060] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0061] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vacuum glass tube solar water heater with an internal circulation heat exchange tube, comprising an energy storage water tank (3), characterized in that: Also includes: A heat preservation box (2) is arranged on one side of the energy storage water tank (3); A plurality of vacuum glass tubes (1) are arranged on both sides of the heat preservation box (2), the plurality of vacuum glass tubes (1) are arranged equidistantly from top to bottom, and the vacuum glass tubes (1) are fixedly connected to the outside of the heat preservation box (2); A first flow guide tube (5) is used to connect two symmetrically arranged vacuum glass tubes (1) located below, with both ends of the first flow guide tube (5) located at the bottom of the inner cavity of the vacuum glass tube (1); A second flow guide tube (8) is used to connect two vacuum glass tubes (1) symmetrically arranged above, with both ends of the second flow guide tube (8) located at the top of the inner cavity of the vacuum glass tube (1); A longitudinal communication unit is provided between two adjacent vacuum glass tubes (1) in the same longitudinal direction, the longitudinal communication unit being used to connect the inner cavities of the two adjacent vacuum glass tubes (1) in the longitudinal direction, the top end of the longitudinal communication unit being located at the bottom of the inner cavity of the upper vacuum glass tube (1), and the bottom end of the longitudinal communication unit being located at the top of the inner cavity of the lower vacuum glass tube (1); A water injection pipe (4) is used to connect the energy storage water tank (3) and the first flow guide pipe (5); the water injection pipe (4) is used to inject water in the energy storage water tank (3) into the inner cavity of the first flow guide pipe (5).

2. The vacuum glass tube solar water heater with an internal circulation heat exchange tube according to claim 1, characterized in that: Both ends of the first flow guide tube (5) pass through the heat preservation box (2); the outer side of the first flow guide tube (5) is fixedly connected to the heat preservation box (2) at the point where it passes through; and the two ends of the first flow guide tube (5) respectively extend to a side of the inner cavity of the vacuum glass tube (1) away from the heat preservation box (2).

3. The vacuum glass tube solar water heater with internal circulation heat exchange tube according to claim 1, characterized in that: Both ends of the second flow guide tube (8) pass through the heat preservation box (2); the outer side of the second flow guide tube (8) is fixedly connected to the heat preservation box (2) at the point where it passes through; and the two ends of the second flow guide tube (8) are respectively located on one side of the inner cavity of the vacuum glass tube (1) close to the heat preservation box (2).

4. The vacuum glass tube solar water heater with internal circulation heat exchange tube according to claim 1, characterized in that: The longitudinal communication unit is a first communication conduit (7), the top end length of the first communication conduit (7) is greater than the bottom end length, the two ends of the first communication conduit (7) respectively penetrate the side wall of the heat preservation box (2) and extend to the inner cavities of two longitudinally adjacent vacuum glass tubes (1), the top end of the first communication conduit (7) is located at the bottom of the inner cavity of the upper vacuum glass tube (1), the top end opening of the first communication conduit (7) is located on the side of the inner cavity of the vacuum glass tube (1) away from the heat preservation box (2), the bottom end of the first communication conduit (7) is located in the inner cavity of the lower vacuum glass tube (1), and the bottom end opening of the first communication conduit (7) is located on the side of the inner cavity of the lower vacuum glass tube (1) close to the heat preservation box (2).

5. The vacuum glass tube solar water heater with internal circulation heat exchange tube according to claim 3, characterized in that: The outer side of the second flow guide tube (8) is fixedly connected to a flow tube (6), the other end of the flow tube (6) is fixedly connected to the energy storage water tank (3), and the inner cavity of the flow tube (6) is in communication with the inner cavity of the second flow guide tube (8).

6. The vacuum glass tube solar water heater with internal circulation heat exchange tube according to claim 5, characterized in that: The second flow guide pipe (8) is also connected to a water outlet pipe (10). The second flow guide pipe (8), the circulation pipe (6) and the water outlet pipe (10) are arranged in a cross-shaped cross-connection arrangement. A solenoid valve (9) is fixedly installed at the intersection. The solenoid valve (9) is used to control the communication between the inner cavities of the second flow guide pipe (8), the circulation pipe (6) and the water outlet pipe (10).

7. The vacuum glass tube solar water heater with internal circulation heat exchange tube according to claim 1, characterized in that: One end of the water injection pipe (4) is fixedly connected to the outside of the first flow guide pipe (5); the inner cavity of the first flow guide pipe (5) is communicated with the inner cavity of the water injection pipe (4); the water injection pipe (4) penetrates the side wall of the heat preservation box (2); the outer side of the water injection pipe (4) is fixedly connected to the penetration point of the heat preservation box (2); the water injection pipe (4) is also connected to a water pump, and the water pump is used to inject water in the energy storage water tank (3) into the vacuum glass tube (1) through the first flow guide pipe (5).

8. The vacuum glass tube solar water heater with internal circulation heat exchange tube according to claim 1, characterized in that: The inner side of the heat preservation box (2) is covered with heat insulation cotton.

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