Pre-heating type solar water heater

Abstract

The invention relates to a pre-heating type solar water heater which comprises a pre-heating water tank; a plurality of heat collecting tubes are fixedly arranged on the upper part of the pre-heating water tank; the pre-heating water tank comprises a housing layer and a light-transmitting plate; a pre-heating cavity is formed between the light-transmitting plate and the housing layer; a light reflecting layer is arranged on the surface of the housing layer; the pre-heating water tank is connected with the heat collecting tubes through a connecting water tank; the connecting water tank comprises a water inlet cavity, a middle-temperature cavity and a high-temperature cavity; the bottom of the water inlet cavity is connected with a public water source; the top of the water inlet cavity communicates with the bottom of the pre-heating water tank; the bottom of the middle-temperature cavity communicates with the top of the pre-heating water tank; the top side wall of the middle-temperature cavity communicates with each heat collecting tube; the bottom of the high-temperature cavity is separately equipped with a low-temperature circulating tube and a high-temperature water inlet tube; the low-temperature circulating tube passes through the top of the middle-temperature cavity and extends to the bottom position of the middle-temperature cavity; the high-temperature water inlet tube communicates with the top of the middle-temperature cavity; the other end of the high-temperature water inlet tube extends to a top position of the high-temperature cavity; and a used water drainage tube is further arranged on the top of the high-temperature cavity.

Description

technical field [0001] The invention relates to a preheating solar water heater, which belongs to the field of solar water heaters. Background technique [0002] As a kind of environmental protection and energy-saving water heater equipment, solar water heater is widely used by more and more families. The more common one is a solar water heater with array heat collecting tubes, which mainly realizes the collection of infrared rays through hollow heat collecting tubes, and The water in the heat collecting tube is heated and driven by cold and hot flow, without the need for additional water pumps and other mechanisms to achieve a certain energy saving; the hot water of this kind of solar water heater is mainly stored in the water tank with cold and hot distribution after heating, and is used The heat collecting tube is heated in a cycle. Therefore, the heat collecting tube will lose heat due to the deterioration of the vacuum state after a long time. At the same time, the heat...

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Problems solved by technology

[0002] As a kind of environmental protection and energy-saving water heater equipment, solar water heater is widely used by more and more families. The more common one is a solar water heater with array heat collecting tubes, which mainly realizes the collection of infrared rays through hollow heat collecting tubes, and The water in the heat collecting tube is heated and driven by cold and hot flow, without the need for additional water pumps and other mechanisms to achieve a certain energy saving; the hot water of this kind of solar water heater is mainly stored in the water tank with cold and hot distribution after heating, and is used The heat collecting tube is heated in a cycle. Therefore, the heat collecting tube will lose heat due to the deterioration of the vacuum state after a long time. At the same time, the heating rate of the traditional solar water heater is relatively low, and the water storage capacity of the top water tank is also relatively low; In addition, the back of the heat collecting tubes installed in the array cannot be heated because it cannot be exposed to sunlight.

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