CN204987517U - Glass - metal solar vacuum heat collection tube - Google Patents

Abstract

The utility model relates to a glass-metal solar vacuum heat collecting tube, which is composed of a double-layer glass vacuum sleeve and a sealed metal intubation tube. The heat exchange medium circulates in the metal intubation tube, and a sealed corrugated tube is arranged between the glass vacuum tube and the metal tube. The innovation points Yes: the metal cannula is composed of two metal tubes stacked, one end of the metal tube A is processed into a necked shape, the necked section is inserted into the metal tube B, and a section is connected to the outside of the tube at the insertion point of the metal tube The bellows is sealed, and the two ends of the bellows are respectively welded with the metal pipe A and the metal pipe B. When the temperature of the heat exchange medium in the metal tube changes under solar radiation, causing the metal tube to expand and contract, the metal tubes A and B compress or stretch the bellows, and the insertion parts of the metal tubes A and B are relatively axially displaced. , the total length of the collector tube composed of two metal tubes remains unchanged. The distance between the heat collecting tubes in series remains unchanged, the sealing connection is relatively simple and a large-area track system is omitted, and the production and operation costs are greatly reduced.

Description

A kind of glass-metal solar vacuum heat collecting tube

technical field

The utility model relates to a glass-metal solar vacuum heat collecting tube, which belongs to the technical field of high temperature solar heat utilization.

Background technique

Existing glass-metal solar vacuum heat collection tubes are mainly used for high temperature heat collection and power generation. When working, the solar radiation passes through the glass outer tube and irradiates on the metal inner tube coated with solar spectrum absorption coating. Inside the metal inner tube is a heat exchange medium, and the heat exchange medium takes away heat energy by flow. In order to improve the heat exchange capacity of the heat collection system, the glass-metal solar vacuum heat collection tubes are used in series. The inner tube of the glass-metal solar vacuum heat collector tube is a long metal tube. When the temperature of the heat exchange medium in the metal tube changes under solar radiation, the total length of the metal tube will expand or contract. Between, the spacing is changing from time to time, so it is difficult to seal the connection. In the prior art, in order to solve the problem of shrinkage and deformation of metal tubes, rails need to be installed in large-scale power generation and heat collection systems, and the series-connected vacuum tube heat exchange units are arranged on the rails, which results in high operating costs.

Contents of the invention

The purpose of the utility model is to provide a movable connection glass-metal solar vacuum heat collecting tube to solve the shrinkage deformation problem of the metal tube and reduce the production cost of the high temperature solar heat collector.

The technical solution of the utility model is realized in the following way: the glass-metal solar vacuum heat collecting tube is composed of a double-layer glass vacuum sleeve sealed metal intubation, the heat exchange medium circulates in the metal intubation, and the glass vacuum tube and the metal tube A sealing bellows is set between them. The innovation point is: the metal cannula is composed of two metal tubes nested together. One end of the metal tube A is processed into a necked shape, and the necked section is inserted into the metal tube B. At the joint of the pipe, a section of sealed corrugated pipe is connected outside the pipe, and the two ends of the corrugated pipe are welded together with metal pipe A and metal pipe B respectively.

In the glass-metal solar vacuum heat collector tube, 2-3 through holes are distributed along the circumference of the metal tube A between the annular weld of the metal tube A and the sealed corrugated tube and the necking, so that the metal tube is connected to the corrugated tube to avoid temperature changes , when the bellows expands and contracts, air resistance occurs.

The glass-metal solar vacuum heat collecting tube, the two ends of the double-layer glass vacuum sleeve are sealed with kovar alloy rings and glass, and the two ends are equipped with metal discs welded on the kovar alloy rings to form the sealing of the vacuum heat collecting tubes .

In the glass-metal solar vacuum heat collecting tube, one end of the metal disc is provided with an air extraction through hole. After all the welding and melting are completed, a vacuum pump is used to connect the air extraction through hole, and the space between the metal tube and the glass tube is pumped. After becoming vacuum, seal the air pumping through hole again.

In the glass-metal solar vacuum heat collection tube, the kovar ring is provided with grooves on both ends of the double-layer glass vacuum casing to reduce the influence of the expansion of the metal disc on the expansion of the fused seal between the kovar ring and the glass tube.

The glass-metal solar vacuum heat collecting tube of the present utility model adopts the movable connection scheme of the metal casing. When the temperature of the heat exchange medium in the metal tube changes under solar irradiation, causing the expansion and contraction of the metal tube, the metal tubes A and B When the corrugated tube is compressed or stretched, the insertion parts of metal tubes A and B are relatively axially displaced, and the total length of the heat collecting tube formed by the two metal tubes remains unchanged. The distance between the heat collecting tubes in series remains unchanged, the sealing connection is relatively simple and a large-area track system is omitted, and the production and operation costs are greatly reduced. It is in line with the industrial policy of building energy conservation and is conducive to the promotion of high-temperature utilization markets such as solar power generation and central heating.

Description of drawings

Fig. 1 is a schematic diagram of the utility model glass-metal solar vacuum heat collecting tube

A in Figure 2 is a partial enlarged view of Figure 1

In the picture:

1. Through hole 2. Metal tube A3. Air extraction through hole 4. Metal disc

5. Kovar alloy ring 6. Double-layer glass vacuum sleeve 7. Groove

8. Seal bellows 9. Metal tube B

detailed description

The utility model glass-metal solar vacuum heat collecting tube shown in Fig. 1, 2,

The heat collecting tube is composed of a double-layer glass vacuum sleeve and a sealed metal tube. The heat exchange medium circulates in the metal tube. A sealed bellows 8 is set between the double-layer glass vacuum sleeve 6 and the metal tube. The innovation is as described The metal cannula is composed of two metal tubes stacked together. One end of the metal tube A is processed into a necked shape, and the necked section is inserted into the metal tube B. At the joint of the metal tube, a section of sealed bellows 8 is connected outside the tube. The two ends of the corrugated pipe are respectively welded with metal pipe A and metal pipe B.

2-3 through-holes 1 are distributed along the circumference of the metal pipe A between the ring-shaped weld of the metal pipe A and the sealing bellows and the necking, so that the metal pipe is connected to the bellows to avoid temperature changes, and air resistance occurs when the bellows expands and contracts.

The two ends of the double-layer glass vacuum sleeve of the utility model are sealed with kovar alloy rings 5 and glass, and the two ends are provided with metal discs 4 welded on the kovar alloy ring to form the sealing of the vacuum heat collecting tube.

All welds are annular continuous welds, and all welds are annular continuous welds. All welds or welds shall be free from air leakage defects. One end of the metal disc is provided with an air extraction hole 3. After all welding and melting are completed, a vacuum pump is used to connect the air extraction hole, and the space between the metal tube and the glass tube is evacuated, and then the air extraction hole is sealed. .

The kovar alloy ring 9 is provided with grooves 7 outside the two ends of the double-layer glass vacuum sleeve 6 to reduce the influence of the expansion of the metal disk on the expansion of the fused seal between the kovar alloy ring and the glass tube.

The above description is only proposed as a technical solution that can be implemented by the glass-metal solar vacuum heat collecting tube of the present invention, not as a restriction on its structure or technology.

Claims (5)

1. a glass-metal solar vacuum heat-collecting pipe, be made up of double-glass vacuum sleeve pipe (6) sealing metal intubate, heat transferring medium is at metal cannula internal circulation flow, seal bellows (8) is set between double-glass vacuum sleeve pipe and metal tube, it is characterized in that: described metal cannula is become by two metal pipe sleeve stacked groups, reducing shape is processed in one end of metal tube A (2), reducing section is inserted in metal tube B (9), at metal tube splicing position, the outer socket of pipe one section of seal bellows (8), bellows two ends respectively with metal tube A, metal tube B welds together.

2. glass-metal solar vacuum heat-collecting pipe according to claim 1, it is characterized in that: described at metal tube A and between seal bellows annular solder place and reducing, along metal tube A circle distribution 2-3 through hole, make metal tube diaphragm for passageway to avoid variations in temperature, when bellows stretches, produce vapour lock.

3. glass-metal solar vacuum heat-collecting pipe according to claim 1, it is characterized in that: the built-in kovar alloy ring (5) in described double-glass vacuum sleeve pipe (6) two ends and glass melt envelope, two ends arrange rosette (4) and are welded on the upper shutoff forming vacuum heat collection pipe of kovar alloy ring (5).

4. glass-metal solar vacuum heat-collecting pipe according to claim 3, it is characterized in that: described rosette (4) one end is provided with through hole of bleeding (3), in all welding with melt after envelope completes, through hole of bleeding is connected with vavuum pump, after being evacuated between metal tube and glass tube, then through hole (3) involution of bleeding.

5. glass-metal solar vacuum heat-collecting pipe according to claim 3, is characterized in that: described kovar alloy ring (5) has groove (7) to expand and melt the impact of expanding at envelope place to reduce rosette to kovar alloy ring and glass tube in double-glass vacuum sleeve pipe (6) two ends arranged outside.