CN203719179U - Phase-change heat storage type solar water heater device - Google Patents

Abstract

The utility model relates to a phase-change heat storage type solar water heater device, which comprises a water inlet pipe, a water outlet pipe, a plurality of vacuum pipes, an air exhaust pipe and an overheat protecting device, wherein the interior of each vacuum pipe is provided with a hollow pipe, the water inlet end and water outlet end of each hollow pipe are respectively communicated with the water inlet pipe and the water outlet pipe, the interior of each vacuum pipe is also provided with a phase-change heat storage medium, the bottom of each vacuum pipe is fixedly connected with an end cap, the upper parts of the vacuum pipes are respectively communicated with the air exhaust pipe through connecting pipes, the interior of each connecting pipe is provided with a filter net, the air exhaust pipe is provided with an air exhaust valve, the overheat protecting device comprises a heat storage pipe, connecting pipes and safety valves, the two ends of the heat storage pipe are communicated with the water outlet pipe through the connecting pipes, the connecting pipes are respectively provided with one safety valve, the heat storage pipe is provided with a condenser, and the inner peripheral wall of each hollow pipe is provided with more than one spiral groove. The solar water heater device has the advantages that the size is small, the secondary heat exchange is realized, and the heat exchange efficiency and the safety are high.

Description

Phase change heat storage solar water heater device

technical field

The utility model relates to a phase change heat storage type solar water heater device, which belongs to the technical field of solar energy devices.

Background technique

Existing solar water heaters comprise matching hot water storage tanks and vacuum tubes, and the hot water storage tanks and vacuum tubes are mounted on supports. When the solar water heater is working, the vacuum tube absorbs the heat of the sun's rays, and the heated water flows into the hot water storage tank in the form of thermal convection before use. However, the solar water heater with this structure takes up a lot of space, is inconvenient to install, and only The cold water in the water tank can be heated by a single vacuum tube, the heat exchange efficiency is low, and it is not suitable for cold areas, because in cold areas, solar water heaters are prone to freezing, which will affect the normal operation of solar water heaters in severe cases, and the water flow in the hollow The flow in the tube will generate bubbles on the inner wall of the hollow tube. When there are many bubbles, a layer of air film will be formed at last. The air film has a low density and poor heat transfer, which affects the temperature of the water in the hollow tube and reduces the heat transfer efficiency. Preventing the formation of gas film in the metal tube is crucial to the heat transfer effect of the hollow tube.

Contents of the invention

The purpose of the utility model is to provide a phase-change thermal storage solar water heater which is not only small in size, but also capable of secondary heat exchange, and has high heat exchange efficiency and safety, so as to overcome the shortcomings of the prior art.

In order to achieve the above object, the technical solution of the present utility model is: a phase-change heat storage solar water heater device, including a water inlet pipe, a water outlet pipe and several vacuum pipes, and hollow pipes are arranged in several vacuum pipes, and the hollow pipes Both the water inlet end and the water outlet end protrude out of the vacuum tube and communicate with the water inlet pipe and the water outlet pipe respectively, and the water inlet pipe is lower than the water outlet pipe,

a. A phase-change heat storage medium is respectively provided in the plurality of vacuum tubes, and the bottom of each vacuum tube is fixedly connected with an end cover;

b. It also includes an exhaust pipe. The upper parts of several vacuum pipes are respectively connected to the exhaust pipe through connecting pipes, and a filter screen is arranged in the connecting pipe, and an exhaust valve is installed on the exhaust pipe;

c. It also includes an overheating protection device. The overheating protection device includes a heat storage pipe, a connecting pipe and a safety valve. condenser;

d. The inner peripheral wall of the hollow tube has more than one spiral groove;

e. The phase change heat storage medium is phase change heat storage paraffin;

f. The diameter of the hollow pipe is 8±0.8mm, and the diameters of the water inlet pipe and the water outlet pipe are both 16±0.8mm;

g. The condenser of the heat storage tube is covered on the outer periphery of the heat storage tube.

The water inlet pipe, the water outlet pipe and the hollow pipe are all copper pipes, and the vacuum pipes are stainless steel pipes.

The hollow tube is a U-shaped tube.

The positive effect of the utility model is: since several vacuum tubes are equipped with phase-change heat storage mediums, when there is sunlight, the vacuum tubes absorb the heat of solar energy to directly heat the cold water in the hollow tubes, and the corresponding The change heat storage medium can absorb solar energy and store heat; when there is no sunlight, the phase change heat storage medium can release heat and reheat the cold water in the hollow tube to realize the secondary heat exchange of the cold water in the hollow tube; and because The utility model has a flat structure and does not include a hot water storage tank that occupies a large space. Therefore, it not only occupies a small space, but also improves the heat exchange efficiency. Since the bottom of each vacuum tube is fixedly connected with an end cover, it is easy to inject Phase-change heat storage medium, the phase-change heat storage medium is phase-change heat storage paraffin, which can increase the temperature of water in the inner cavity of the hollow tube.

Because it also includes an exhaust pipe, the upper parts of several vacuum pipes are respectively connected to the exhaust pipe through connecting pipes, and the lower part of the connecting pipe is provided with a filter screen, and the exhaust port of the exhaust pipe is equipped with an exhaust valve. When the variable heat storage medium absorbs solar energy and stores heat, the volume will become larger, which will cause the pressure in the vacuum tube to also increase. If the pressure in the vacuum tube is too high, the exhaust valve can be opened to reduce the pressure, so as to ensure the pressure of the utility model. security.

Because it also includes an overheating protection device, the overheating protection device includes a heat storage pipe, a connecting pipe and a safety valve. When the heat is released, if the heat is too large, it will cause the hot water in the outlet pipe to overheat, the safety valve on the connecting pipe will open, the hot water will flow into the heat storage pipe, and the condenser on the heat storage pipe will overheat the hot water. The temperature is lowered, so that the user does not need to control the water temperature, and can adjust itself through the overheating protection device, which improves the safety performance.

Since the inner peripheral wall of the hollow tube has a spiral groove, the water flow will change the flow and move forward under the obstruction of the hollow tube groove, and take away the air bubbles generated by the water flow during the solar heating process, thereby preventing The function of air film formation allows the central water flow to fill the wall to enhance heat absorption, so that the heat absorption reaches the maximum value per unit time and improves the heat exchange efficiency. The diameter of the hollow tube is 8mm, and the diameter of the water inlet pipe and the water outlet pipe The diameters are all 16mm, which can reduce the use area of the utility model as far as possible, and can meet the needs of most users.

Description of drawings

Fig. 1 is the structural representation of a kind of specific embodiment of the utility model;

Fig. 2 is an enlarged schematic diagram of part A of Fig. 1;

Fig. 3 is a partially enlarged cross-sectional view of the hollow tube in Fig. 1 .

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and the given embodiments, but it is not limited thereto.

As shown in Figures 1, 2, and 3, a phase-change thermal storage solar water heater device includes a water inlet pipe 1, an outlet pipe 2, and several vacuum pipes 3, and hollow pipes 4 are arranged in several vacuum pipes 3. The pipe 4 is a U-shaped pipe, and the water inlet 4-1 and the water outlet 4-2 of the hollow pipe 4 extend out of the vacuum tube 3 and communicate with the water inlet 1 and the water outlet 2 respectively, and the water inlet 1 is lower than the outlet. The water pipe 2, the several vacuum pipes 3 are also provided with a phase-change heat storage medium 5, and the bottom of each vacuum pipe 3 is fixedly connected with an end cover 6; it also includes an exhaust pipe 7, and the upper parts of the several vacuum pipes 3 are respectively Be connected with exhaust pipe 7 by connecting pipe 9, and be provided with strainer 10 in connecting pipe 9, exhaust valve 8 is housed on described exhaust pipe 7; Also comprise overheat protection device 11, overheat protection device 11 comprises heat storage pipe 11-1, connecting pipe 11-2 and safety valve 11-3, both ends of the heat storage pipe 11-1 are connected with the outlet pipe 2 through the connecting pipe 11-2, and the connecting pipe 11-2 is equipped with a safety valve 11 -3, the heat storage tube 11-1 is provided with a condenser 11-4; the inner peripheral wall of the hollow tube 4 has more than one spiral groove 4-3.

As shown in FIG. 1 , the phase-change heat storage medium 5 is a phase-change heat storage paraffin, which can increase the temperature of the water in the inner cavity of the hollow tube 4 . But it is not limited to phase change heat storage paraffin, and other heat storage materials such as phase change heat storage balls can also be used.

As shown in Figure 1, the water inlet pipe 1, the water outlet pipe 2 and the hollow pipe 4 are all copper pipes, the vacuum pipe 3 is a stainless steel pipe, and the water inlet pipe 1, the water outlet pipe 2 and the hollow pipe 4 adopt copper pipes because the copper pipes The thermal conductivity of the vacuum tube 3 is strong, and the stainless steel tube is used for the vacuum tube 3 because the stainless steel tube has excellent anti-corrosion performance and can improve the service life of the vacuum tube 3 .

As shown in Figure 1, the diameter of the hollow pipe 4 is 8mm, and the diameters of the water inlet pipe 1 and the water outlet pipe 2 are both 16mm, which can reduce the use area of the utility model as much as possible, and can meet the needs of most users.

As shown in Figure 1, since the hollow tube 4 is a U-shaped tube, the heated cold water in the hollow tube 4 flows back and forth, prolonging the heat exchange time, making the heat exchange more sufficient and better Heat exchange effect. Of course, it is not limited thereto, and the hollow pipe 4 may also be a threaded pipe or the like.

A brief description of the use of the utility model is: before use, the bottom of the vacuum tube 3 is injected with a phase-change heat storage medium 5, and the end cover 6 is welded to the bottom of the vacuum tube 3 . When in use, the cold water in the water inlet pipe 1 flows into the hollow pipe 4 for heat exchange, and when there is sunlight, the vacuum pipe 3 absorbs the heat of solar energy to directly heat the cold water in the hollow pipe 4, and the corresponding The heat storage medium 5 can absorb solar energy and store heat; its phase transition point is 56°C, that is, when the temperature reaches 56°C, the phase change heat storage medium 5 starts its phase transition process from solid to liquid, that is, it accumulates heat and starts to melt , and keep its own temperature at 56°C. When external water passes through the hollow tube 4, the water is heated, and it can continuously absorb and store solar heat. When there is no sunlight, the phase-change heat storage medium 5 can release heat, the cold water in the hollow tube 4 is reheated, and the secondary heat exchange of the cold water in the hollow tube is realized, and the heat exchange efficiency is improved; the heated water flows into the outlet pipe 2 through the hollow tube 4, due to this The utility model has a flat plate structure and does not include a hot water storage tank that occupies a large space. Therefore, it occupies a small space. When the phase change heat storage medium 5 releases heat, if the heat is too large, it will cause heat in the outlet pipe 2. When the water is overheated, the safety valve 11-3 on the connecting pipe 11-2 will be opened, hot water will flow into the heat storage pipe 11-1, and the condenser 11-4 on the heat storage pipe 11-1 will adjust the temperature of the hot water. Cool down, so that the user does not need to control the water temperature, it can be adjusted by itself through the overheat protection device 11, preventing the safety hazard caused by the overheating of the hot water temperature, and improving the safety performance. The connecting pipe 11-2 passes through the tee pipe and the outlet pipe 2 connected, the condenser 11-4 wraps the outer circumference of the heat storage pipe 11-1 to improve the cooling efficiency, and the safety valve 11-3 adopts a T/P temperature and pressure safety valve.

Since the inner peripheral wall of the hollow tube 4 has a spiral groove 4-3, the water flow will change and move forward under the hindrance of the groove 4-3 of the hollow tube 4, and the water flow will be heated during the solar heating process. The generated air bubbles are taken away to prevent the formation of the air film, allowing the central water flow to fill the wall to enhance heat absorption, so that the heat absorption per unit time reaches the maximum value, and the heat exchange efficiency is improved.

Since the phase-change heat storage medium 5 absorbs solar energy and stores heat, its volume will increase, which will cause the pressure in the vacuum tube 3 to also increase. If the pressure in the vacuum tube 3 is too high, the exhaust valve 8 can be opened to reduce the pressure. , to ensure the safety of the utility model, so that the safety is high, and the bottom of the connecting pipe 9 is provided with a filter screen 10, which can effectively prevent the phase change heat storage medium 5 from flowing into the exhaust pipe 7.

Claims (3)

1. a phase-change thermal storage type solar energy water heater device, comprise water inlet pipe (1), outlet pipe (2) and several vacuum tubes (3), in several vacuum tubes (3), be equipped with hollow tube (4), the water inlet end (4-1) of hollow tube (4) and water side (4-2) all stretch out outside vacuum tube (3), and be communicated with water inlet pipe (1) and outlet pipe (2) respectively, and water inlet pipe (1), lower than outlet pipe (2), is characterized in that:

In a, described several vacuum tubes (3), be also provided with respectively phase-change thermal storage medium (5), and the bottom of each vacuum tube (3) is all fixedly connected with end cap (6);

B, also comprise blast pipe (7), the top of several vacuum tubes (3) is connected with blast pipe (7) by tube connector (9) respectively, and is provided with filter screen (10) in tube connector (9), and air bleeding valve (8) is housed on described blast pipe (7);

C, also comprise overtemperature protection system (11), overtemperature protection system (11) comprises heat storage tube (11-1), tube connector (11-2) and safety valve (11-3), the two ends of heat storage tube (11-1) are all communicated with outlet pipe (2) by tube connector (11-2), and safety valve (11-3) is all housed on tube connector (11-2), and heat storage tube (11-1) is provided with condenser (11-4);

The internal perisporium place of d, described hollow tube (4) has the spiral groove (4-3) of one or more;

E, described phase-change thermal storage medium (5) are phase-transition heat-storage paraffin;

The diameter of f, described hollow tube (4) is 8 ± 0.8mm, and the diameter of water inlet pipe (1) and outlet pipe (2) is 16 ± 0.8mm;

The condenser (11-4) of g, described heat storage tube (11-1) is coated on heat storage tube (11-1) periphery.

2. phase-change thermal storage type solar energy water heater device according to claim 1, is characterized in that: described water inlet pipe (1), outlet pipe (2) and hollow tube (4) are copper pipe, and vacuum tube (3) is stainless steel tube.

3. phase-change thermal storage type solar energy water heater device according to claim 1, is characterized in that: described hollow tube (4) is U-shaped pipe.