CN202013029U - Heat transfer device for heat pipe type solar heat collector - Google Patents

Abstract

A heat transfer device for a heat pipe solar heat collector, which mainly includes: a heat pipe branch part with the lower end closed and the upper end open in the vacuum glass tube, the upper end of the heat pipe branch is connected with the through hole on the outer casing, and the two axes are perpendicular, The outer sleeve is provided with an inner tube with both ends extending outside the outer sleeve, and the two ends of the outer sleeve are fixed on the inner tube, and the jacket between the outer sleeve and the inner tube and the branch pipe of the heat pipe form a sealed cavity , which is evacuated and filled with heat transfer medium. The above-mentioned vacuum glass tube, heat pipe and inner tube form a heat transfer unit, and the tube row formed by the above-mentioned heat transfer unit is the heat transfer device of the heat pipe solar collector. The utility model has the advantages of novel structure, small thermal resistance, high heat exchange efficiency, stable performance and durability.

Description

Heat transfer device of heat pipe solar collector

Technical field: the utility model relates to a heat pipe type solar heat collector.

Background technology: At present, although there are many brands of solar heat collectors, they basically use vacuum glass tube heat collectors to store heat. The vacuum heat-collecting glass tube is composed of two inner and outer glass tubes set together, and their upper and lower ends are respectively connected to form a closed interlayer, and the inside is vacuumed. The cold water directly enters the glass tube, and through natural convection heat exchange, the heat energy conversion from solar energy to water is realized. Its shortcomings are: 1. In cloudy areas, the water temperature rises very slowly; 2. In cold areas, the water in the vacuum glass tube collector can cause glass tubes to swell after freezing; 3. Deposition in the vacuum glass tube Scale is not easy to remove, and after a long time, it will lead to a decrease in the efficiency of the water heater.

SUMMARY OF THE INVENTION: The purpose of this utility model is to provide a heat transfer device for a heat pipe solar collector with high heat conduction efficiency and durability. The utility model mainly includes a vacuum glass tube, a heat conduction metal fin, a heat pipe and an inner pipe. Among them, the vacuum glass tube is a jacket tube in which two glass sleeve tubes are closed at both ends to form a vacuum. The jacket of the vacuum glass tube is provided with a selective absorbing coating. The above-mentioned vacuum glass tube is provided with a heat pipe branch part with the lower end closed and the upper end open. It is preferable to set a thermally conductive metal fin between the heat pipe branch pipe and the vacuum glass tube, which is a copper sheet or an aluminum sheet with good thermal conductivity. The heat-conducting metal fins are composed of two semi-cylindrical thin-walled metal cylinders with openings in contact with their flat surfaces. Assuming that the semi-cylindrical arc surface is recessed into the cylinder, the semi-cylindrical arc surface of the two fins encloses a nearly cylindrical space, and its diameter is basically the same as the outer diameter of the heat pipe branch located therein. Keep the two in close contact to reduce the thermal resistance between the two. The upper end of the above-mentioned heat pipe branch pipe is connected with the through hole on the outer casing, and the vertical axis of the two is preferably not on the same plane, so that the heat transfer working medium can easily flow into the heat pipe branch pipe. The outer sleeve is provided with an inner tube with both ends extending outside the outer sleeve, and the two ends of the outer sleeve are fixed on the inner tube, and the jacket between the outer sleeve and the inner tube and the branch pipe of the heat pipe form a sealed cavity , which is evacuated and filled with heat transfer fluid. The above-mentioned vacuum glass tube, heat-conducting metal fins, heat pipe and inner pipe form a heat transfer unit, and the tube row formed by several above-mentioned heat transfer units is the heat transfer device of the heat pipe solar collector. There are many ways to connect the above heat transfer units. It can be that the inner tubes at both ends of the adjacent heat transfer units are connected by welding or connectors. It can also be that the outer sleeves of several heat transfer units have the same inner tube inside. The outer casings of several heat transfer units are connected as a whole, and the same inner pipe is arranged inside.

The working process of the utility model is roughly as follows: the sun transmits heat energy to the heat pipe branch pipe through the vacuum glass tube and the heat-conducting metal fin, so that the liquid heat transfer working medium in the heat pipe branch pipe is vaporized and rises to the clamp between the outer tube and the inner tube. Inside the sleeve, the water in it is heated through the inner tube, and at the same time, the vapor heat transfer medium is cooled into a liquid state, and then enters the heat pipe branch under the action of gravity, and so on.

Compared with the prior art, the utility model has the following advantages: 1. novel structure, small thermal resistance and high heat exchange efficiency; 2. stable performance and durability.

Description of drawings:

Fig. 1 is a schematic diagram of the front section of the heat transfer unit of the present invention.

Fig. 2 is a schematic diagram of a side view section of the heat transfer unit of the present invention.

Fig. 3 is a schematic diagram of a section of the heat transfer unit of the present invention.

Fig. 4 is a schematic diagram of the second section of the heat transfer unit of the utility model.

Fig. 5 is a schematic diagram of the front section of the pipe row A of the utility model.

Fig. 6 is a schematic diagram of the front section of the pipe row B of the utility model.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the schematic cross-sectional diagram of the heat transfer unit of the heat transfer device of the heat pipe solar collector shown in Fig. 1 and Fig. 2, the vacuum glass tube 1 is a jacket in which two ends of the two glass casing tubes are closed to form a vacuum Tube. The jacket of the vacuum glass tube is provided with a selective absorbing coating. The above-mentioned vacuum glass tube is provided with a heat pipe branch pipe 2 with the lower end closed and the upper end open. An aluminum thermal conductive metal fin 3 is arranged between the heat pipe branch pipe and the vacuum glass tube. The thermal conductive metal fin is in contact with a flat surface. Composed of two semi-cylindrical thin-walled metal cylinders with openings, the cross-section is symmetrical X-shaped, and the middle part of the straight surface of each semi-cylindrical fin is set to recess into the cylinder to form a semi-cylindrical arc surface , the semi-cylindrical arc surfaces of the two fins enclose a nearly cylindrical space, the diameter of which is basically the same as the outer diameter of the heat pipe branch located therein. There are two types of cross-sections for the heat-conducting metal fins of the utility model, one is that there is a flanging on both sides of the joint of the thin metal cylinder, as shown in Figure 3; the other is that there is a certain gap at the joint of the thin metal cylinder, as shown in Figure 4 shown. The upper ends of the above-mentioned heat pipe branch pipes are connected to the through holes on the outer sleeve 4, and the axes of the two are vertical and not on the same plane. The outer casing is provided with an inner tube 5 with both ends extending out of the outer casing, and the two ends of the outer casing are fixed on the inner tube, and the jacket between the outer casing and the inner tube and the branch pipe of the heat pipe form a sealed cavity Body, which is evacuated and filled with heat transfer fluid. The above-mentioned vacuum glass tube, heat-conducting metal fins, heat pipe and inner pipe form a heat transfer unit. In the schematic diagram of the front view section of the utility model tube row A shown in Fig. 5, the same inner tube is arranged in the outer sleeves of the 10 above-mentioned heat transfer units, and the tube row formed by them is the transfer tube of the heat pipe type solar collector. heat device. In the schematic diagram of the front view section of the tube row B of the utility model shown in Figure 6, the outer casings of the 10 above-mentioned heat transfer units are connected as a whole, and the same inner tube is arranged inside, and the tube row formed by them is a heat pipe type. Heat transfer device for solar collectors.

Claims (7)

1. the heat transfer unit (HTU) of a hot pipe type solar heat collector, it is characterized in that: the heat pipe that is provided with the lower end closed upper end open in the glass tube with vacuum props up tube portion, the upper end of this heat pipe arm links to each other with through hole on the outer tube, both axis normal, be provided with two ends in the above-mentioned outer tube and all reach the outer interior pipe of outer tube, and the two ends of outer tube are fixing on inner pipe, outer tube and interior pipe chuck and heat pipe arm arm between the two constitutes a seal chamber, vacuumize in it and the filling heat-transfer working medium, above-mentioned glass tube with vacuum, heat pipe and interior pipe constitute a heat transfer unit, arrange the heat transfer unit (HTU) that is the heat pipe type solar heat collection device by the pipe that above-mentioned heat transfer unit constitutes.

2. the heat transfer unit (HTU) of hot pipe type solar heat collector according to claim 1 is characterized in that: be provided with the thermal conductance metal tab between this heat pipe arm and glass tube with vacuum.

3. the heat transfer unit (HTU) of hot pipe type solar heat collector according to claim 1 and 2 is characterized in that: establish in this glass tube with vacuum chuck and have coating for selective absorption.

4. the heat transfer unit (HTU) of hot pipe type solar heat collector according to claim 3, it is characterized in that: heat pipe arm and outer tube axis are not at grade.

5. the heat transfer unit (HTU) of hot pipe type solar heat collector according to claim 4 is characterized in that: the interior pipe at above-mentioned adjacent heat transfer unit two ends links to each other by welding or connector.

6. the heat transfer unit (HTU) of hot pipe type solar heat collector according to claim 4 is characterized in that: establish pipe in same in the outer tube of heat transfer unit.

7. the heat transfer unit (HTU) of hot pipe type solar heat collector according to claim 4, it is characterized in that: the outer tube of heat transfer unit is connected as a single entity, and establishes pipe in same in it.

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