A solar water heater antifreeze belt life testing device and method

Abstract

The invention relates to a life testing device for an antifreeze belt of a solar water heater, which belongs to the technical field of solar water heaters. It includes a time relay, an electromagnetic relay, a counter, a data acquisition instrument, a temperature measuring resistor, a fixing device, and a terminal; one end of the terminal is connected to the antifreeze belt, the other end is connected to the time relay, the time relay is connected to the electromagnetic relay, and the electromagnetic relay It is connected with the counter, the antifreeze belt is fixed on the fixing device, and the temperature measuring resistor is arranged on the heat dissipation surface of the antifreeze belt; the data acquisition instrument is connected with the temperature measuring resistor. Taking advantage of the characteristics of the antifreeze belt itself having a certain power, it can be directly tested for heating and cooling cycles by powering on and off, thus simulating the real use environment of the antifreeze belt, and can test the service life of the antifreeze belt more accurately.

Description

technical field [0001] The invention belongs to the technical field of solar water heaters, and in particular relates to a device and method capable of simulating the use state of an antifreeze belt of a solar water heater, and further testing the life of the antifreeze belt. Background technique [0002] The antifreeze belt has the function of heating and heating, and it is wound around the outer circumference of the solar water heater's sewer pipe, which mainly plays the role of protecting the solar water heater's sewer pipe from being frozen or even cracked in winter. Its power and heat dissipation can still be guaranteed after cycling between hot and cold states. [0003] my country does not have clear requirements for the life of the antifreeze belt of solar water heaters, but only requires that the factory power meet the corresponding requirements (GB / T19835 requires thermal stability testing of the antifreeze belt), however, if the antifreeze belt fails during use , i...

AI Technical Summary

Problems solved by technology

After the long-term test and analysis of the present invention, it is found that the antifreeze belt itself is a heating element, and if it is heated with a foreign medium, it will lose its own effect, and heating with a metal plate will cause unnecessary damage to the antifreeze belt, increase the test error, and cannot A more definite response to the performance of the antifreeze belt itself

In the test method provided by the above-mentioned national standard, the antifreeze belt is required to be tested in the insulation layer. Because the antifreeze has a self-limiting temperature function, it cannot reach its own maximum temperature, which reduces the aging degree of the test sample and increases the resistance to the sample. test error

Because in the test method of the above-mentioned national standard, it is required that the power after the test is completed shall not be lower than 90% of the original power. However, the production and installation practice of the present invention proves that after the test using the above-mentioned national standard method, the anti-freeze belt has not only lost power, but also The serious problem of sudden increase in power after aging, because the joints are generally on the roof, and the power becomes larger after being wet, and the ignition is connected to the electricity when starting. For solar installations, because the insulation layer is not a flame-retardant material, it is often cause a fire accident

For this reason, it is necessary to study a device for testing the life of antifreeze belts of solar water heaters, in order to solve the inconvenience caused by the test method in the national standard GB / T32348. The antifreeze belt completely matches the service life of the solar water heater before leaving the factory

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