JPH0112131Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a solar heat collection circuit that automatically shuts off the secondary circuit when a liquid leakage occurs in the heating medium.

Prior Art As a conventional solar heat collection circuit, the one shown in FIG. 1 is known. The heat collecting circuit described above circulates the heat collected by a heat medium flowing in the heat collector a into the hot water storage tank b to heat the city water in the hot water storage tank b, and extracts it as hot water from the secondary circuit c. , a level gauge f is provided in the expansion tank e provided at the upper part of the heat collection pipe d, and when the heat medium decreases due to liquid leakage etc., the pump g provided in the heat collection pipe d is stopped, The solenoid valve h provided in the secondary circuit c is cut off. However, in the heat collection circuit as described above, if the heat exchanger i in the hot water storage tank b corrodes and city water flows into the heat collection pipe d, for example, this cannot be detected because the liquid level of the heat medium does not fall. Even if the heating medium deteriorated, there were problems such as the fact that it was impossible to judge whether it was good or bad without looking directly at the heating medium.

Purpose of the invention This invention was made with the purpose of improving such problems, and it provides a solar thermal concentrator circuit that optically detects leakage or deterioration of the heating medium and shuts off the secondary circuit. This system is designed to reliably detect leakage and deterioration of media, as well as inflow of city water.

Structure of the device: An optical detection system in which a transparent riser pipe connects the conduit connected to the top of the solar heat collector and the expansion tank, and a light emitting element and a light receiving element are placed opposite each other across the riser pipe. Along with setting up a container,
A solar heat collection circuit configured to stop a pump and shut off a solenoid valve provided in a secondary circuit based on a signal detected by the optical detector.

Embodiment This invention will be described in detail below with reference to an embodiment shown in FIG. , flows into the solar heat collector 3 through the pipe 2, where the solar heat is collected. The heat medium heated by solar heat is pipe 4
It reaches the heat exchanger 6 in the hot water storage tank 5 via the power station 7, where it exchanges heat with the city water flowing into the hot water storage tank 5 through the power station 7, and then reaches the pump 1, where the pump 1 returns to the solar heat collector. It is circulated to 3. Moreover, the city water heated in the hot water storage tank 5 is discharged from a secondary circuit 9 having a solenoid valve 8 and is made available for use.

On the other hand, the pipe line 4 connected to the upper part of the solar heat collector 3
An expansion tank 10 is connected in the middle to absorb the thermal expansion and contraction of the heat medium, and a riser pipe 11 connecting the expansion tank 10 and the pipe line 4 is made of transparent material such as glass. It is formed by a tube. Also, a light emitting element 12a and a light receiving element 1 are placed at opposing positions with this riser tube 11 in between.
An optical detector 12 consisting of 2b is provided.
The light emitted from the light emitting element 12a of the optical detector 12 is normally blocked by the heat medium and does not reach the light receiving element 12b, but if the heat medium leaks and the liquid level falls below the limit line 13. If city water gets mixed into the heating medium and the concentration drops, or if the heating medium deteriorates and the concentration drops, the light receiving element 12b detects the light from the light emitting element 12a and stops the pump 1. At the same time, the solenoid valve 8 of the secondary circuit 9 is cut off.

Effects of the Idea As described in detail above, this idea prevents liquid leakage from the solar heat collector 3 and the pipes 2 and 4 connected thereto, and corrosion of the heat exchanger 6 in the hot water storage tank 5. If city water gets mixed into the medium or the heat medium deteriorates, the optical detector 12 optically detects this and stops and shuts off the pump 1 and the secondary circuit 9. The problem of unheated city water being discharged into the secondary circuit 9 can be solved, and since deterioration of the heat medium can be detected without directly looking at the heat medium, maintenance and management can be easily performed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional heat collection circuit, FIG. 2 is a circuit diagram showing an embodiment of this invention, and FIG. 3 is an enlarged view of the vicinity of the detector. 1 is a pump, 3 is a solar collector, 4 is a pipe, 5
1 is a hot water tank, 8 is a solenoid valve, 9 is a secondary circuit, 10 is an expansion tank, 11 is a riser pipe, and 12 is an optical detector.

Claims (1)

[Scope of utility model registration request] The heat medium is circulated by the pump 1 to the solar heat collector 3 and the hot water tank 5, and the city water in the hot water tank 5 is heated by the heat collected by the solar heat collector 3, and taken out as hot water from the secondary circuit. In this device, a transparent riser pipe 11 is used to connect the conduit 4 connected to the upper part of the solar heat collector 3 and the expansion tank 10, and a light emitting element 12a and a light receiving element are placed at opposite positions across the riser pipe. In addition to providing an optical detector 12 in which the element 12b is arranged, the pump 1 is stopped by the signal detected by the optical detector 12, and the electromagnetic valve 8 provided in the secondary circuit 9 is stopped. A solar heat collection circuit that is cut off.