Working method for anti-cracking all-glass vacuum heat collecting tube of solar water heater
A technology of solar water heaters and vacuum heat collecting tubes, applied in solar heat collectors, solar thermal energy, solar heat collectors using working fluids, etc., can solve problems affecting product quality, user economic burden, cost increase of solar water heaters, etc., to achieve Simple and convenient process method
Inactive Publication Date: 2007-05-02
惠令宏
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Problems solved by technology
How to eliminate the internal stress generated by the water tank interface of the vacuum heat collecting tube is a difficult problem to solve, which will directly affect the product quality
Although the manufacturer has indicated on the product instructions: users should water in the morning and evening, and air drying is prohibited to prevent bursting, but the phenomenon of bursting still occurs from time to time, which brings a lot of inconvenience to people.
In order to avoid the above problems, some manufacturers adopt the method of not leaking water in the tube, and increase the heat transfer of precious metals, which leads to a great increase in the cost of solar water heaters, and the thermal efficiency has not been improved. At the same time, it has caused unnecessary economic burdens on users.
Method used
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example 1
[0011] Firstly take the blank inner tube 1 and outer tube 2 and cut them to a fixed length; bake one end of the inner tube 1 and outer tube 2 with fire respectively to form a round flat open end as the water tank interface end, and then bake the inner tube with fire respectively and the other end of the outer tube to form a tapered circular sealing end, wherein the outer tube end is reserved with an exhaust pipe 4, and then the end is annealed; after the outer side of the inner tube is coated with an absorbing film layer 3, Use a glass lathe to heat and seal the water tank interface with the outer pipe, as shown in Figure 1: a stone-milled refractory sealing plug is arranged between the water tank interface of the inner pipe and the inner pipe plating absorption film, and a triangular shaped plug is used in natural wind. The annealing nozzle is annealed, the annealing temperature is between 550-600°C, and the annealing time is 80-120 seconds; then the vacuum is drawn through th...
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Baking inner tube rough and outer tube rough in certain length makes one end of tube form circular flat open end connected to opening of water tank. Baking another end of inner tube and outer tube forms convergent circular sealed end. End of outer tube includes an exhaust tube. Following fabricating steps are carried out: annealing end parts, coating absorbing film outside inner tube, and inserting insulating refractory between the absorbing film and opening of water tank; connecting and sealing tubes to opening of water tank; annealing at temp 500-650 deg.C for 60-140 seconds; vacuumizing outer tube through a exhaust tube and sealing it to obtain finished product. The invention removes internal stress of heat collection tube, thus, phenomena of detonating heat collection tube will not be happened if cold water is added into heat collection tube, which is in temp higher than 100 deg.C.
Description
technical field [0001] The invention belongs to the technical field of water heaters, and in particular relates to a processing method for a burst-proof all-glass vacuum heat collecting tube of a solar water heater. Background technique [0002] With the continuous improvement of people's living standards, more and more families choose solar water heaters. The most important part of solar water heaters is the all-glass vacuum heat collection tube used to absorb heat. At present, most of the all-glass vacuum heat collectors sold in the market use all-glass vacuum heat collectors because of their high thermal efficiency and low cost; however, it is difficult to eliminate the stress generated during the processing of all-glass vacuum heat collectors. The outer wall of the inner side of the heat pipe needs to be coated with a layer of solar absorbing film first, and the absorbing film will be destroyed when it exceeds 400°C, and the annealing temperature for eliminating the stre...
Claims
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IPC IPC(8): F24J2/05C03B25/00F24J2/46F24S10/40
CPCY02E10/44
Inventor 惠令宏
Owner 惠令宏