CN201569178U - Solar heat collection device with vacuum circulating heat collection element with heat-emitting cover glass tube - Google Patents

Abstract

The utility model relates to a solar heat collection device with vacuum circulating heat collection elements with heat-emitting cover glass tubes. The solar heat collection device is formed by a plurality of vacuum circulating heat collection elements with heat-emitting cover glass tubes, a load container and an installation frame. Each heat collection element is formed by a cover glass tube, an absorber and a natural circulating runner, wherein the natural circulating runner is formed by an ascending tube, a descending tube and a heat emitting end. The utility model is characterized in that the ascending tube is connected with the absorber by low thermal resistance or the ascending tube is integrally manufactured with the absorber, and an elastic heat transfer element is arranged between the heat emitting end and the cover glass tube. The utility model has the advantages that: for places in which the vacuum circulating heat collection element can be obliquely or vertically arranged, the circulating heat transfer requires no power, the startup is rapid, the freezing resistance is high, the tube is not cracked, the heat can also be collected if a single tube is damaged, and the vacuum circulating heat collection element can be used for manufacturing a solar heat collection device with water quality compliant with health standard, much obtained heat and excellent heat preservation performance; and the design of the heat exchange interface is flexible, no sensitivity to vacuum degree exists, the vacuum circulating heat collection element can semi-permanently and stably work within a temperature range of 20-500 DEG C, low-carbon steel and aluminum can be used for substituting for copper, the heat collection element protected against overheat can prevent no-load sunning. Two embodiments are given as shown in the accompanying drawing.

Description

Cover glass tube exothermic vacuum cycle heat collector element solar heat collector

technical field

The utility model relates to a solar heat collecting device of a cover glass tube exothermic vacuum cycle heat collecting element.

Background technique

Vacuum intubated solar water heaters can provide domestic hot water in winter, but there is a large heat sink in the collector tube, less heat gain, poor frost resistance, tube explosion, water leakage if a single tube is damaged, and excessive water quality degradation bacteria. Heat pipe heat collecting elements can be used to manufacture water heaters without water in the pipes, but copper-water heat pipes are expensive, easy to freeze, and some have obvious performance degradation.

Contents of the invention

The purpose of the utility model is to provide a cover glass tube exothermic vacuum cycle heat collecting element solar heat collecting device.

The technical scheme adopted by the utility model to solve its technical problems: use several cover glass tubes to form a vacuum cycle heat collecting element with heat release, load container and installation frame to form a cover glass tube heat release vacuum cycle heat collection element solar heat collection device. The vacuum cycle heat collecting element is composed of a closed cover glass tube, an absorber placed in the cover glass tube, and a natural circulation flow channel composed of an upward tube, a down tube and a heat release end. The natural circulation channel is filled but not Filled with liquid heat medium, the upward pipe of the natural circulation channel is connected with the absorber placed in the vacuum insulation layer with low thermal resistance or made integrally with the absorber, and there is an elastic tube between the heat release end of the natural circulation channel and the cover glass tube. Heat transfer parts.

The beneficial effects of the utility model include: for occasions that can be placed tiltably or vertically, no power is needed for circulating heat transfer, fast start-up, anti-freeze, no tube explosion, heat collection can still be performed if a single tube is damaged, water quality can be manufactured to meet hygienic standards, and Solar heat collector with high heat and excellent heat preservation performance; free design of heat exchange interface, insensitive to vacuum, semi-permanent and stable operation in the range of 20-500 °C, low-carbon steel and aluminum can be used instead of copper, heat collector with overheating protection Components can prevent air-drying accidents.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a schematic diagram of the structure of a solar heat collecting device with a cover glass tube exothermic vacuum cycle heat collecting element.

Fig. 2 is a structural diagram of a solar heat collection device with an overheating protective cover glass tube exothermic vacuum circulation heat collection element.

In the figure 1. heat collecting element; 2. load container; 3. cover glass tube; 4. absorber; 5. up tube; 6. down tube; 7. heat release end; Neck section; 10. Free end claw; 11. Thermal element.

Detailed ways

In Fig. 1, the heat-collecting element 1 of the vacuum circulation of the cover glass tube exothermic is inserted into the load container 2 with an insulating layer to form a solar heat collection device of the heat-releasing vacuum circulation heat-collecting element of the cover glass tube. The load container 2 includes a water storage tank and a union box. The vacuum circulation heat collecting element 1 is composed of a closed cover glass tube 3, an absorber 4 placed in the cover glass tube 3, and a natural circulation flow channel composed of an up tube 5, a down tube 6 and a heat release end 7. The ascending pipe 5 of the circulation channel is made integrally with the absorber 4 placed in the vacuum insulation layer 8 , and an elastic heat transfer member is used for heat transfer between the tubular heat-radiating end 7 and the constricted section 9 of the cover glass tube 3 . The tubular heat release end 7 exchanges heat with the load container 2 through the elastic heat transfer element and the necking section 9 .

The embodiment of Fig. 1 covers the vacuum circulation heat collecting element of the glass tube to release heat. The solar heat collecting device is installed obliquely at the high position of the heat releasing end 7 under the sunlight, so that the liquid surface of the heat medium shown by the oblique dotted line is in a horizontal state. The sunlight passes through the cover glass tube 3 and is converted into heat energy on the absorber 4. The heat energy is transferred to the heat medium in the upward pipe 5 through the absorber 4, and the heat medium expands and floats up through the upward pipe 5. At the hot end 7, the heat medium releases heat energy and the temperature drops and sinks into the downgoing pipe 6. After sinking to the bottom, it enters the upgoing pipe 5 again to be heated and floats up. In this way, the heat collection cycle goes round and round along the path shown by the arrow curve. At the same time, the water or heat medium in the load container 2 is continuously heated.

Through the heat exchange between the cover glass tube and its necking section and the load, the Kovar sealing connector can be omitted, with good sealing performance and corrosion resistance.

Sometimes, the load container that cooperates with heat collecting element also needs heat collecting element to have such a constricted section.

The vacuum heat insulation between the ascending pipe 5 and the descending pipe 6 in the embodiment shown in Fig. 1 is very beneficial to circulation heat collection.

The infrared reflective material is coated on the surface of the non-light-receiving area of the cover glass tube, which can effectively reduce the radiation heat loss of the heat collecting element.

In Fig. 2, the heat collecting element 1 with automatic overheat protection cover glass tube exothermic vacuum circulation heat collecting element 1 is inserted into the load container 2 with heat insulation layer to form a solar heat collecting device with automatic overheat protection cover glass tube exothermic vacuum cycle heat collecting element. The vacuum circulation heat collecting element 1 is composed of a closed cover glass tube 3, an absorber 4 placed in the cover glass tube 3, and a natural circulation flow channel composed of an up tube 5, a down tube 6 and a heat release end 7. The upward pipe 3 of the circulation flow channel is integrally produced with the absorber 4 placed in the vacuum heat insulation layer 8; a bimetallic sheet thermal power with a free end claw 10 connected to the down pipe 6 with low thermal resistance is set in the vacuum heat insulation layer 8 Component 11; an elastic heat transfer element is used for heat transfer between the tubular heat release end 7 and the neck section 9 of the cover glass tube 3 . The tubular heat release end 7 exchanges heat with the load container 2 through the elastic heat transfer element and the necking section 9 .

Under normal operating temperature, the tubular heat-radiating end 7 releases heat through the elastic heat-transfer member and the constricted section 9 of the cover glass tube 3 . The free-end claw 10 of the bimetal heat element 11 is not in contact with the cover glass tube 3 .

When the internal temperature of the heat collecting element is too high, the free end claws 10 of the bimetal thermal element 11 are heated and turned outward to the position shown by the dotted line to contact the cover glass tube 3, and part of the heat energy passes through these free end claws 10 and the cover glass tube 3 dissipate to the environment, so that the temperature of the heat collecting element 1 is reduced to realize overheating protection. Overheat protection can be automatically released.

The thermal element 11 can also be connected with the absorber 4 with low thermal resistance; the thermal element can also be made of memory alloy.

Claims (4)

1. Covered glass tube exothermic vacuum cycle heat collecting element solar heat collecting device is composed of several cover glass tube exothermic vacuum cycle heat collecting elements, load container and installation frame. The vacuum cycle heat collecting element consists of a closed cover The glass tube, the absorber placed in the cover glass tube, and a natural circulation channel composed of an ascending tube, a descending tube and a heat release end, the natural circulation channel is filled but not filled with liquid heat medium, which is characterized by natural circulation The ascending pipe of the flow channel is connected with the absorber placed in the vacuum insulation layer with low thermal resistance or made integrally with the absorber, and there is an elastic heat transfer element between the heat release end of the natural circulation flow channel and the cover glass tube. 2. The heat collecting device according to claim 1, characterized in that the cover glass tube of the heat collecting element contains a necking section, and there is an elastic transmission between the tubular heat release end of the natural circulation flow channel and the necking section of the cover glass tube. hot piece. 3. The heat collecting device according to claim 1, characterized in that the vacuum heat insulation layer of the heat collecting element contains a bimetal thermal element connected with the absorber or the downcomer with low thermal resistance and with free end claws. 4. The heat collecting device according to claim 1, characterized in that the inner surface of the non-light-receiving area of the cover glass tube is coated with an infrared reflective material.

Images