WO2018126891A1

WO2018126891A1 - Flat-panel solar thermal collector

Info

Publication number: WO2018126891A1
Application number: PCT/CN2017/117489
Authority: WO
Inventors: 白峻光
Original assignee: 白峻光
Priority date: 2017-01-03
Filing date: 2017-12-20
Publication date: 2018-07-12
Also published as: CN107062638A

Abstract

A flat-panel solar thermal collector having a tank (5), a corrugated pipe (7), a grille (8), a transparent tank cover (1) and an expansion tank (19). The tank (5) is provided with an inlet pipe (11), an outlet pipe (12) and a drain valve (10). The corrugated pipe (7) is provided inside the tank (5). One end of the corrugated pipe (7) connects to the inlet pipe (11), and the other end thereof connects to an outlet pipe (12). A solar absorber coating (6) is disposed on the outer surface of the corrugated pipe (7). The frame of the grille (8) connects to the tank (5) rigidly. The bottom surface of the transparent tank cover (1) connects to the top surface of the grille (8) by means of removable crimp contacts. The edges of the transparent tank cover (1) connect to the mouth of the tank (5) sealingly. The expansion tank (19) is disposed outside the tank (5). The expansion tank (19) has an enclosed container (2). An inflation ball (3) is provided inside the container (2). A connection pipe (4) is provided on the container (2). One end of the connection pipe (4) connects to the inside of the inflation ball (3), and the other end thereof connects to the inside of the tank (5).

Description

Plate solar collector

Technical field

The invention provides a solar collector, in particular a plate solar collector.

Background technique

The working principle of the plate type solar collector is to realize the heating of the water by the principle of the glass greenhouse effect, and then the heated water is pumped to the heating device through the circulation, and the heat collecting component in the existing plate type solar collector is The surface of the heat collecting tube or the heat collecting plate is smooth, and the transparent tube is provided above the heat collecting tube, and the glass plate is fixed on the outer frame. Because the glass has poor compression resistance and impact resistance, the space inside the frame cannot be vacuumed. Yes, poor heat preservation results in large heat loss, structural defects lead to low heat exchange efficiency, and its market is gradually being replaced by vacuum tube solar collectors, because the plate solar water heater also has a simple structure, low cost, and lifetime. Maintenance has few and simple advantages, so there is an urgent need to improve the structure of existing panel solar collectors.

technical problem

The object of the present invention is to provide a plate type solar collector with good heat preservation effect and high heat exchange efficiency.

Technical solution

The utility model relates to a plate type solar heat collector, which is characterized in that: a tank body, a bellows, a grille, a transparent tank cover and an expansion tank, wherein the tank body is provided with an inlet pipe, an outlet pipe and an emptying valve, and the groove body is provided with ripples a tube, one end of the bellows is connected with the inlet pipe, and the other end is connected with the outlet pipe. The outer surface of the bellows is provided with a solar heat absorbing coating; the frame of the grille is fixedly connected with the groove body, the bottom surface of the transparent groove cover and the top of the grille The movable surface is crimped, and the edge of the transparent groove cover is sealingly connected with the mouth of the tank body; the expansion tank is placed outside the tank body, the expansion tank has a closed tank body, the tank body is provided with an expansion ball, and the tank body is provided with a connection The tube has one end connected to the inside of the expansion ball and the other end communicating with the inside of the tank.

The transparent groove cover has a light-transmissive upper cover plate and a lower cover plate, and a closed gap is arranged between the upper and lower cover plates, and an exhaust valve is arranged on the upper cover plate.

The grid is provided with a solar heat absorbing coating.

The transparent cover is a soft glass cover.

Beneficial effect

Since the working principle of the plate type solar collector is to realize the heating of water by the principle of the glass greenhouse effect, the larger the heat collecting surface area is, the higher the heat exchange efficiency is. Therefore, the bellows is used instead of the surface smoothing heat collecting tube in the conventional technology. Or the heat collecting plate can effectively multiply the heated surface area in the three-dimensional space, can collect and exchange heat faster, and has high collection and heat exchange efficiency. The grid is arranged under the transparent tank cover, which can improve the compressive strength of the transparent tank cover, and can vacuum the space inside the tank to make the heat preservation effect good, and the black surface of the grid surface can absorb more solar heat energy. The expansion tank can balance the gas pressure in the tank, avoiding the excessive pressure of the gas in the tank, causing the phenomenon of "increasing the tank" to occur, so that the applicable ambient temperature range is wider. When the temperature in the tank is higher than the external temperature, the transparent tank cover will conduct heat outward. Therefore, after the airtight valve is used to extract a certain degree of vacuum between the upper and lower covers, the upper and lower covers can be installed. The metal or plastic grille is used to support the upper and lower cover plates, which can effectively prevent the temperature in the tank from being lost to the outside, further enhance the heat preservation effect and improve the heat exchange efficiency. Soft glass cover (PVC soft crystal plate), withstand pressure and impact resistance, can withstand hail, high-altitude falling objects and other disasters, will not produce sharp fragments when damaged, safe to use.

DRAWINGS

1 is a schematic structural view of a plate type solar heat collector of the present invention.

2 is a schematic view showing another structure of the plate type solar heat collector of the present invention.

1 transparent cover, 2 cans, 3 expansion balls, 4 connection pipes, 5 tanks, 6 solar heat absorption coating, 7 bellows, 8 grids, 9 insulation layers, 10 rows of empty valves, 11 inlet pipes 12 outlet pipes, 13 heat exchangers, 14 frames, 15 upper covers, 16 lower covers, 17 gaps, 18 suction valves, 19 expansion tanks, 20 skeletons, 21 drain valves, 22 temperature sensors, 23 circulation pumps.

BEST MODE FOR CARRYING OUT THE INVENTION

A plate type solar collector has a tank body 5, a bellows 7, a grille 8, a transparent tank cover 1, and an expansion tank 19, wherein the tank body is provided with an inlet pipe 11, an outlet pipe 12 and an emptying valve 10, and a groove The body is provided with a bellows, one end of which is connected with the inlet pipe, and the other end is connected with the outlet pipe. The outer surface of the bellows is provided with a solar heat absorbing coating 6; the frame of the grille is fixedly connected with the groove body, and the bottom surface of the transparent groove cover The top surface of the grille is crimped, and the edge of the transparent groove cover is sealingly connected with the mouth of the tank; the expansion tank is placed outside the tank, and the expansion tank has a closed tank 2, and the tank is filled with an expanding ball. 3. The tank body is provided with a connecting pipe 4, one end of which is in communication with the inside of the expanding ball and the other end is in communication with the inside of the tank body. The tank body is a metal tank body or a FRP tank body. When the tank body is a FRP tank body, the tank body should be provided with a metal skeleton 20 for supporting the whole structure and connecting the external mounting frame and performing heat preservation. When the body is a metal tank, the inner and outer surfaces should be covered with a heat insulating layer 9. The surface of the heat insulating layer should be sprayed or laid with solar heat absorbing materials. If there is no heat insulating layer in the metal tank, the inner surface of the metal tank should be coated. Black coating. The grid is provided with a solar heat absorbing coating or a black coating. The expansion ball is a hollow rubber soft elastic ball. The venting valve is used to evacuate. The bottom of the tank body is further provided with a drain valve 21 for discharging water.

In use, the outlet pipe is coupled to the hot water inlet of the heat device 13, and is connected to the inlet of the circulation pump 23 by the return water outlet of the heat device, and the outlet of the circulation pump is connected to the inlet pipe, and the temperature sensor is installed in the tank. 22. It is used for real-time monitoring of the temperature in the tank, and controls the circulating pump switch and the flow rate of the inlet and outlet water through the upper computer. The water generally refers to a heat exchange fluid medium, including a composite fluid such as antifreeze liquid and thermal oil guiding oil.

The bellows body is also provided with a plurality of bellows support frames. The bellows is supported by the brackets in the tank body. The surface of the bellows is coated with a solar heat absorbing layer, and the special wave pattern of the surface of the bellows increases the heat collecting area, compared with the preset. The collecting plate of the water channel has higher efficiency of directly attracting heat to the outer wall of the bellows, and the exposed surface of the tank body is sprayed with black coating or covering the solar heat absorbing film to increase the heat collecting effect, and the outer surface of the groove is made of thermal insulation layer, and the groove body faces the sun surface. The pressing part corresponding to the edge of the transparent groove cover is sealed by sealing or glued, and the transparent groove cover and the inner space of the groove are kept sealed by a bolt assembly or a sealing fastener. After installation, the emptying valve is opened. When the temperature in the tank is relatively high, the thermally expanded gas is discharged through the venting valve. At this time, the venting valve is closed and kept closed, thereby maintaining the relative vacuum inside the tank, and if necessary, vacuuming equipment can be used to assist the vacuuming.

The transparent cover has a light-transmissive upper cover 15 and a lower cover 16, and a closed gap 17 is arranged between the upper and lower covers, and an upper valve is provided on the upper cover, and the upper and lower covers are A metal or plastic grille may be installed to support the upper and lower covers, wherein a gasket is arranged between the lower cover and the trough body. In this embodiment, the periphery of the upper cover and the lower cover are The peripheral seal is welded to form a sac-like unit, and a frame 14 is mounted therein for supporting the upper and lower covers to form a closed space.

The transparent cover is a soft glass cover. The transparent cover is a glass cover or a PC cover or a PVC cover or a soft glass cover, preferably a soft glass cover. The soft glass cover has a smooth surface, no cracks, no bubbles, uniform color, heat resistance, cold resistance, anti-aging, heavy pressure resistance, strong acid and alkali resistance, good light transmission and long service life. In this structure, the upper cover The transparent groove cover composed of the plate and the lower cover is made of bag-type PVC soft glass, and the frame 14 is arranged in the middle, and the openings on both sides are sealed to form a transparent groove cover with a closed space inside.

The plate type solar heat collector of the invention is 5-8 times of the heat exchange efficiency of the traditional collector (laboratory test data), and has the advantages of simple manufacture, fast heat rising, high utilization efficiency of sunlight, and difficulty in scaling. The utility model has the advantages of small temperature difference stress, small circulation resistance, light weight, easy installation array, simple and easy operation, and the like, and is suitable for various sun-facing positions, simple packaging and easy transportation, and space saving.

Claims

The utility model relates to a plate type solar heat collector, which is characterized in that: a tank body, a bellows, a grille, a transparent tank cover and an expansion tank, wherein the tank body is provided with an inlet pipe, an outlet pipe and an emptying valve, and the groove body is provided with ripples a tube, one end of the bellows is connected with the inlet pipe, and the other end is connected with the outlet pipe. The outer surface of the bellows is provided with a solar heat absorbing coating; the frame of the grille is fixedly connected with the groove body, the bottom surface of the transparent groove cover and the top of the grille The movable surface is crimped, and the edge of the transparent groove cover is sealingly connected with the mouth of the tank body; the expansion tank is placed outside the tank body, the expansion tank has a closed tank body, the tank body is provided with an expansion ball, and the tank body is provided with a connection The tube has one end connected to the inside of the expansion ball and the other end communicating with the inside of the tank.
A panel type solar collector according to claim 1, wherein the transparent groove cover has a light-transmissive upper cover and a lower cover, and a closed gap is provided between the upper and lower covers. An exhaust valve is mounted on the upper cover.
A panel solar collector according to claim 1 or 2, wherein the grid is provided with a solar heat absorbing coating.
A plate type solar heat collector according to claim 1 or 2, wherein the transparent groove cover is a soft glass cover.