CN201043815Y - Vacuum star heat pipe solar water heater - Google Patents

Abstract

The utility model relates to a vacuum star-style heat-pipe solar water heater. The collector tube comprises a superconduct pipe with the middle provided with an interval channel and with the periphery provided with heat-absorbing fins and a vacuum glass pipe. The superconduct pipe is arranged in the vacuum glass pipe. The utility model is characterized in a simple structure, high efficiency of thermal conversion, stable operation and easy maintenance.

Description

Vacuum star heat pipe solar water heater

Technical field:

The utility model relates to a vacuum star heat pipe type solar water heater.

Background technique:

The existing solar water heaters are all vacuum glass heat pipe solar water heaters. One end of the vacuum glass tube is closed and the other end is open. The principle of heat preservation is exactly like a thermos bottle. The outer surface of the inner tube is coated with selective heat-absorbing film, and the open end is connected to the hot water tank. , water diversion for heat exchange, hot and cold water are both up and down from the same nozzle, this is the working principle of the vacuum glass heat pipe type.

The advantages are: simple structure and high thermal efficiency.

The disadvantages are: (1) The cold and heat shocks are easy to explode the tube, so the water needs to be watered sooner or later, which limits the hot water production. (2) Once a vacuum glass tube is accidentally broken, the whole machine will be short of water and needs to be repaired; this is a major defect for the large-tonnage array. (3) Most of the deposits and scaling are concentrated on the slope and the bottom, causing the heat exchange to attenuate day by day, and the others are omitted.

Another superconducting type of vacuum glass heat pipe is to lay a layer of unshaped copper film in the vacuum glass heat pipe, and install a copper tube with both ends sealed in the middle, and insert one end into the hot water tank. This is the heat exchange section.

The working process is: the coated glass tube absorbs heat and passes through-air layer-copper film-air layer-copper film-upload to the hot water tank for heat exchange.

Advantages According to the product advertisement: the vacuum glass heat pipe superconducting type completely overcomes the six major defects of the vacuum glass heat pipe type.

Disadvantages: (1) There are too many heat transfer layers: five layers, the heat transfer distance is too long, calculated based on the length of the glass tube of 1800, the average heat transfer distance is greater than 900mm, and the axial heat transfer section is extremely small, and the thermal resistance is large; (2 ) 0.3 thick unshaped copper film and glass heat pipe, the contact point between the copper tube is only a few dozen points at best, which weakens the superconducting ability of the copper tube; (3) The heat exchange area is the part that extends into the water tank A small piece of copper tube, once scaled, will have a greater impact; (4) There is no water in the glass heat pipe, which looks like dry burning, and the temperature is much higher than that of the water in the tube, and there is still a potential risk of cold shock blasting the tube ; (5) The air is fast in convection, but not a good conductor of heat, and its thermal efficiency is low.

Invention content:

The purpose of the utility model is to provide a vacuum star-shaped heat pipe solar water heater, which not only has a simple structure, high heat conversion efficiency, but also reliable operation and is convenient for maintenance and management.

The utility model is characterized in that: the heat collecting tube is composed of a superconducting metal tube and a glass vacuum tube with flow channels in the middle and heat-absorbing fins in the outer periphery, and the superconducting metal tube is placed in the glass vacuum tube.

The utility model remarkable advantage is:

1. High thermal efficiency: The vacuum glass tube transmits light and keeps heat without absorbing heat. It is a cold tube type, which reduces the risk of cold shock tube explosion to zero, and truly realizes that hot water is used to flush cold water without being limited by sunshine time. The coated superconducting metal tube with heat-absorbing fins has a large sun-facing area and can absorb more light and heat energy. The surface is coated with a heat-absorbing film, and the water in the tube is directly exchanged for heat exchange. The heat transfer level is 1:1, and the heat transfer distance is only equal to the average thickness of the tube wall less than 4mm. One-way siphon heat circulation of cold water from bottom to top realizes radiation, conduction and convection in all directions, and full-area heat exchange. As long as the water is used reasonably, the production of hot water will be doubled;

2. Reliable operation: there is no water leakage in the glass tube, even if a few glass tubes are accidentally broken, there will be no urgent situation of water shortage to be repaired, and the superconducting metal tube coated with heat-absorbing fins during the day can still collect enough heat To meet the needs, night, siphon stop. The thermal rise and cold drop of water has semiconductor heat transfer characteristics, delaying the heat preservation time of the hot water tank, and the water heater can continue to be used until it is repaired. This feature is comparable to non-glass heat pipes;

3. Low heat consumption: the water storage capacity of the coated superconducting metal tube with fins is only 1/8 of that of the glass heat pipe, due to the small water storage capacity. It starts quickly during the day, and when the siphon stops at night, the heat loss is also small, and the accumulation over the years is also a large sum;

4. Easy to manufacture: the aluminum alloy extrusion molding process is mature and efficient, and it is easier to coat metal tubes than glass, and there is no problem of breakage;

5. Excellent cost performance: The transparent vacuum glass tubes at both ends can be easily connected in series with two or three joints to form a large-scale display solar water heater, which saves many other parts in the middle and has a higher cost performance.

Description of drawings

Fig. 3 is a schematic structural view of Embodiment 1 of the utility model.

Figure 1 is a schematic diagram of the overall structure of a vacuum star heat pipe solar water heater.

Fig. 2 is a view along the direction A of Fig. 1 .

Fig. 4 is a schematic diagram of the structure of the second embodiment. Among the figure, 12 is a water tank, 13 is a positioning rubber ring, 14 is a plug, and 15 is an aperture.

Detailed ways:

The utility model is characterized in that the heat collecting tube is composed of a superconducting metal tube 1 with heat-absorbing fins 3 in the middle and a glass vacuum tube 2, and the superconducting metal tube is placed in the glass vacuum tube.

In order to increase the hot water production, the superconducting metal tube is a star-shaped superconducting metal tube, and the outer surface of the superconducting metal tube is provided with a heat absorbing film.

Embodiments of the utility model also include a bracket 4, a water tank 5 placed above the bracket and a heat collecting tube device connected to the bottom of the water tank. The heat collecting tube device has a downflow tube 6 and a return tube 7, and the upper end of the downflow tube is connected to Water outlet 8 at the bottom of the water tank, the lower end of which is connected to the shunt pipe 9, the lower part of the return heat collecting pipe is connected with the shunt pipe, and the upper end leads to the upper part of the water tank through the confluence pipe 10, and only one downflow pipe is connected to the bottom of the water tank. The shunt pipe is connected with a plurality of return heat collecting pipes, and the said confluence pipe leads to the upper part of the water tank through a heat return heat pipe 11 .

When working, sunlight passes through the glass vacuum tube and the air layer, and its heat energy is absorbed by the superconducting metal tube to exchange heat with water. Using the heat rise and cool down siphon effect of water, the hot water rises and is sent to the upper part of the water tank through the return heat collecting tube. Under the action of its own weight, the colder water at the bottom flows into the shunt pipe from the downflow pipe, and then is sent from the shunt pipe to the return heat collector pipe for the next round of heat exchange, so far a one-way siphon heat cycle chain is formed.

Another typical embodiment: sunlight passes through the vacuum glass tube, the air layer is absorbed by the heat collecting tube, and the heat is transferred to the water, the hot water rises to the open end and is released into the water tank, and the cold (warm) water passes through several small holes from the lower part of the water tank. The hole flows into the bottom of the heat collecting tube for the next round of heat exchange.

Claims (6)

1. star-like pipe type solar heat water heater of vacuum is characterized in that: thermal-collecting tube has superconducting metal pipe and the glass-vacuum tube that the runner peripheral part has a heat absorption fin by the middle part and constitutes, and described superconducting metal pipe is placed through in the glass-vacuum tube.

2. the star-like pipe type solar heat water heater of vacuum according to claim 1 is characterized in that: described superconducting metal pipe is a star-like superconducting metal pipe.

3. the star-like pipe type solar heat water heater of vacuum according to claim 2 is characterized in that: described superconducting metal tube outer surface is provided with absorption film.

4. according to claim 1 or the star-like pipe type solar heat water heater of 2 or 3 described vacuum, it is characterized in that: comprise support, place the water tank and the thermal-collecting tube device that is connected in the water tank below of support top, described thermal-collecting tube device has down-pipe and backflow thermal-collecting tube.

5. the star-like pipe type solar heat water heater of vacuum according to claim 4, it is characterized in that: described down-pipe upper end is connected in the water tank bottom delivery port, the lower end is connected on the isocon, and described backflow thermal-collecting tube bottom is connected with isocon, and the upper end leads to the top of water tank through collecting pipe.

6. the star-like pipe type solar heat water heater of vacuum according to claim 5 is characterized in that: described water tank below only is connected with a down-pipe, and described isocon connects with many backflow thermal-collecting tubes, and described collecting pipe leads to water tank upper through a hot reflux heat pipe.

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