Box type heat exchanger and air type solar water heating system

Abstract

The utility model discloses a box-type heat exchanger and an air-type solar water heating system. The heat exchanger is arranged in a water tank; the upper part and the lower part of the water tank are respectively provided with a leading-in port and a leading-out port for leading in and leading out liquid; the heat exchanger is cylindrical, a heat exchange bin is arranged in the heat exchanger, a plurality of heat exchange pipes with fins are vertically arranged in the heat exchange bin in a penetrating mode, and an air inlet and an air outlet are formed in the heat exchange bin. A plurality of flow guide partition plates are arranged in the heat exchanger and can restrain snakelike flow of liquid in the annular barrel. According to the structure, the contact area of liquid and high-temperature airflow can be further increased, the heat exchange efficiency is improved, the heat exchanger can be miniaturized on the basis of the same heat efficiency, and the water storage capacity of the water tank is improved. The box-type heat exchanger is applied to an air-type solar water heating system and is combined with solar heat collection to form a water heating structure, so that the contact area of liquid and gas can be increased, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air energy heating, and in particular relates to a box-type heat exchanger and an air-type solar water heating system. Background Art

[0002] As is known to all, existing solar heating technology heats the liquid inside by passing a liquid medium through a solar pipe, which is then exposed to the sun. The disadvantages of this heating method are low thermal efficiency, being unsuitable in winter, being prone to freezing on cold nights, and cracking of the pipe when exposed to the sun during the day.

[0003] Through technological innovation, technicians in this field have designed an air-heating collector, the specific structure of which is to set a heat exchanger inside the water tank; the heat exchanger is provided with an air inlet and an air outlet and extends to the outside of the water tank, and the high-temperature hot air flow passes through the air-heating collector to heat the inside of the water tank.

[0004] After testing and small-batch use, those skilled in the art believe that the above heating structure still needs to be improved. In the prior art, although the contact area between the hot air flow and the water source is increased, it still has the possibility of further expansion. The current heating structure of this type of box-type heat exchanger still needs to be improved. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the utility model provides a box-type heat exchanger and an air-type solar water heating system. By introducing the hot air flow into the heat exchanger in the water tank, the structure of the heat exchanger is reduced, but the area of its heat exchange zone is increased, which can effectively improve its heat exchange efficiency.

[0006] A box-type heat exchanger comprises a water tank, wherein a heat exchanger is arranged inside the water tank; an inlet and a outlet are respectively provided at the upper and lower parts of the water tank; the heat exchanger is cylindrical, and a heat exchange chamber is provided inside the heat exchanger, a plurality of heat exchange tubes are vertically penetrated in the heat exchange chamber, heat exchange fins are provided on the periphery of the heat exchange tubes, and an air inlet and an air outlet are provided on the heat exchange chamber; a plurality of guide baffles are provided inside the heat exchanger to constrain the airflow to flow in a serpentine manner in the heat exchange chamber; an exhaust valve is provided on the top of the water tank.

[0007] The heat exchanger is arranged inside the water tank through a support frame or a support rod.

[0008] An internal auxiliary heating device is provided inside the water tank, and the internal auxiliary heating device is an electric heater or a fuel heater.

[0009] A sewage pipe is provided at the bottom of the water tank, and a switch is provided on the sewage pipe.

[0010] An air-type solar water heating system comprises several solar heat collecting assemblies, wherein the air inlet and the air outlet provided on the water tank are connected in series with the solar heat collecting assemblies and the fan; an auxiliary heating device and a temperature sensing device are provided inside the water tank and are connected with an external control device.

[0011] The solar heat collection assembly comprises at least two headers, which are connected via double-pass pipes, and the headers at the head and tail are respectively connected to the heat exchangers.

[0012] The beneficial effects of the present invention are as follows: the present invention is provided with a heat exchanger inside the water tank; the upper and lower parts of the water tank are respectively provided with an inlet and an outlet for liquid introduction and discharge; the heat exchanger is cylindrical, and a heat exchange chamber is provided inside the heat exchanger, and a plurality of heat exchange tubes with fins are vertically provided inside the heat exchange chamber, and an air inlet and an air outlet are provided on the heat exchange chamber; a plurality of guide baffles are provided inside the heat exchanger to constrain the serpentine flow of the liquid in the annular cylinder. The above structure can further increase the contact area between the liquid and the high-temperature airflow, thereby improving the heat exchange efficiency. Moreover, on the basis of the same thermal efficiency, the heat exchanger can be miniaturized, thereby increasing the water storage capacity of the water tank. The box-type heat exchanger is applied in an air-type solar water heating system, and is combined with a solar heat collector to form a hot water structure, which can increase the contact area between the liquid and the gas and improve the heat exchange efficiency. It is an ideal box-type heat exchanger and air-type solar water heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the box-type heat exchanger;

[0014] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the box-type heat exchanger;

[0015] Figure 3 This is the structural diagram of the air-type solar water heating system;

[0016] In the attached figure, 1. water tank, 10. supporting leg, 11. outlet, 12. inlet, 13. sewage pipe, 14. exhaust valve, 15. sensor, 16. water inlet valve, 17. water outlet valve, 2. electric heater, 21. power interface, 3. heat exchanger, 31. heat exchange chamber, 32. heat exchange tube, 33. guide baffle, 34. air outlet, 35. air inlet, 36. support rod, 4. control computer, 5. solar thermal collection combination, 51. two-way pipe, 52. header, 53. air outlet pipe, 54. air inlet pipe, 55. circulation fan, 56. circulation switch. DETAILED DESCRIPTION

[0017] As shown in the figure, the utility model designs a box-type heat exchanger, which improves the heat exchange efficiency by arranging the heat exchanger in the water tank. Then, this box-type heat exchanger is applied to the air-type solar water heating system, which can effectively improve the heat exchange efficiency of the entire solar water heating system.

[0018] Example 1:

[0019] like Figure 1 、 2 As shown, a box-type heat exchanger includes a water tank 1. Support legs 11 are provided at the bottom of the water tank 1 to support the entire water tank 1.

[0020] A heat exchanger 3 is provided inside the water tank 1; an inlet 12 and a outlet 11 are respectively provided at the upper and lower parts of the water tank 1. The inlet 12 is used to inject water into the interior of the water tank 1. To achieve precise control, the inlet 12 and the outlet 11 are respectively adapted to be provided with an inlet valve 16 and an outlet valve 17; the outlet 11 is used to divert the heated liquid inside the water tank 1 to the outside.

[0021] The heat exchanger 3 is cylindrical, and a heat exchange chamber 31 is provided in the heat exchanger 3. The heat exchange chamber 31 is a closed structure. A plurality of heat exchange tubes 32 are vertically penetrated in the heat exchange chamber 31. Heat exchange fins are provided on the periphery of the heat exchange tubes 32. An air inlet 35 and an air outlet 34 are provided on the heat exchange chamber 31. A plurality of guide baffles 33 are provided inside the heat exchanger 3. In this embodiment, the air inlet 35 and the air outlet 34 are respectively provided at the upper and lower parts of the side walls of the heat exchange chamber 31. Three guide baffles 33 are provided inside the heat exchange chamber 31 at intervals and crosswise. Figure 2 As shown, this structure can constrain the airflow to flow in a serpentine shape in the heat exchange chamber 31 .

[0022] Furthermore, the water tank 1 is provided with an internal auxiliary heating device, which can be an electric heater or a fuel heater. In this embodiment, the auxiliary heating device is an electric heater 2. To improve heating efficiency, this electric heater 2 is a single heating tube or a heating row (containing two or more heating tubes), with a power supply interface 21 at the end of the heating row. By providing the electric heater 2, an electric auxiliary heating method in addition to thermal heating can be implemented.

[0023] An exhaust valve 14 is provided on the top of the water tank 1. After the water tank 1 is heated by the heat exchanger 3, when the temperature exceeds 100 degrees Celsius, in order to prevent the internal steam pressure from being too high, safe gas discharge can be achieved through the exhaust valve 14.

[0024] A sewage pipe 13 is provided at the bottom of the water tank 1 , and a switch is provided on the sewage pipe 13 . The user can clean the inside of the water tank 1 regularly to prevent excessive dirt inside the water tank 1 from clogging the sewage pipe 13 .

[0025] Example 2:

[0026] On the basis of Example 1, the present invention further discloses an air-type solar water heating system, which internally adopts the box-type heat exchanger disclosed in Example 1.

[0027] Its specific structure is as follows: it includes multiple solar thermal collection combinations 5, and the solar thermal collection combination 5 includes four headers 52. Adjacent headers 52 are connected by double-way pipes 51. The headers 52 at the head and tail extend out air inlet pipes 54 and air outlet pipes 53 respectively, and are connected to the circulating fan 55 and the heat exchanger 3 through the air inlet pipe 54 and the air outlet pipe 53. This connection structure can conduct the heat collected by the solar thermal collection combination 5 to the box-type heat exchanger inside the water tank 1.

[0028] More specifically, inside water tank 1, heat exchanger 3 is provided with an air inlet 35 and an air outlet 34. Air inlet 35 is connected to a circulating fan 55 and an air outlet duct 53, while air outlet 34 is directly connected to the air inlet duct 54 via a pipeline and controlled by a circulating switch 56 on the pipeline. This structure realizes a series connection between heat exchanger 3 and solar thermal collection assembly 5. During operation, the utility model collects heat from multiple solar thermal collection assemblies 5 exposed to sunlight, and the circulating fan 55 directs the heat flow into heat exchanger 3, thereby achieving heat exchange.

[0029] In the above heat exchange process, heat collection can be achieved when the light is strong. However, on rainy days or at night, the hot water cannot be heated by the solar heat collection combination 5, and the above equipment is at risk of not being able to operate. In order to make up for this technical disadvantage, the utility model makes the following improvements. On the basis of Example 1, a temperature sensor is provided on the water tank 1, which is connected to an external control device through the temperature sensor. In this embodiment, the external control device is a control computer 4. Usually, this temperature sensor is fixed inside the water tank 1. The control computer 4 is connected to the auxiliary heater to achieve auxiliary heating. The auxiliary heater is an electric heater 2. The electric heater 2 is provided with a power interface 21 connected to an external high-voltage power supply. The connection and fixation of the electric heater 2, the control computer 4 and the temperature sensor described above are all common technologies in this technical field. Those skilled in the art can fully implement this technology under the guidance of the above specification, and no more detailed description is given here.

[0030] In summary, this box-type heat exchanger is used in an air-type solar water heating system. It is combined with solar heat collection to form a hot water system, which can increase the contact area between liquid and high-temperature gas and improve heat exchange efficiency. It is an ideal box-type heat exchanger and air-type solar water heating system.

Claims

1. A box-type heat exchanger comprising a water tank, characterized in that: A heat exchanger is provided inside the water tank; an inlet and a outlet are provided at the upper and lower parts of the water tank respectively; the heat exchanger is cylindrical, a heat exchange chamber is provided inside the heat exchanger, a plurality of heat exchange tubes are vertically penetrated in the heat exchange chamber, heat exchange fins are provided on the periphery of the heat exchange tubes, and an air inlet and an air outlet are provided on the heat exchange chamber; a plurality of guide baffles are provided inside the heat exchanger; an exhaust valve is provided on the top of the water tank.

2. The box-type heat exchanger according to claim 1, characterized in that: The heat exchanger is arranged inside the water tank through a support frame or a support rod.

3. The box-type heat exchanger according to claim 1, characterized in that: An internal auxiliary heating device is provided inside the water tank, and the internal auxiliary heating device is an electric heater or a fuel heater.

4. The box-type heat exchanger according to claim 1, characterized in that: A sewage pipe is provided at the bottom of the water tank, and a switch is provided on the sewage pipe.

5. An air-type solar water heating system using the box-type heat exchanger according to claim 1, characterized in that: It includes several solar heat collection assemblies. The air inlet and outlet arranged on the water tank are connected in series with the solar heat collection assemblies and the fan. An auxiliary heating device and a temperature sensor are arranged inside the water tank and connected with an external control device.

6. The air-type solar water heating system according to claim 5, characterized in that: The solar heat collection assembly comprises at least two headers, which are connected via double-pass pipes, and the headers at the head and tail are respectively connected to the heat exchangers.

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