JPS6131663Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses a blower to store indoor heat in the ground around the pipes through multiple heat dissipation pipes buried underground when the temperature inside the greenhouse is high. This invention relates to a temperature control device for a heat storage type greenhouse that can supply energy into the greenhouse.

A conventional greenhouse is constructed as shown in Figs. 1 and 2, and in the figures, 1 is the outer shell of the greenhouse including the roof, 2 is an indoor ventilation duct provided in the room A surrounded by this outer shell, 3 is a blower for indoor air circulation installed in this duct, and 4 is installed so that one end of the opening communicates with the ventilation duct 2, and the other end opens into the room on the opposite side of the duct installation position. This is a heat dissipation pipe for heat storage, which will be described later, and is buried underground in the room A. 5 is the soil around this pipe 4, 6 is the crop, and 7 is an outlet for indoor circulating air that is connected to the other end of the pipe 4.

In the above configuration, during the hot day, if the temperature in the room A becomes higher than the optimum temperature for the crops 6 due to solar heat, etc., for example, if the temperature rises to 25°C or higher, the blower 3 will be turned off automatically by its upper limit temperature sensor (not shown). It starts driving under the control of As a result, indoor air is blown out from the ventilation duct 2 through the heat radiation pipe 4 into the room A from the outlet 7, and in this state, heat is stored in the surrounding soil 5 via the heat radiation pipe 4.

In this way, during the hot day, the room A is kept at an appropriate temperature while storing heat. On the other hand, at night, the temperature in the room A decreases, and if this drops below the optimum temperature for the crops, for example, 10 degrees Celsius or less, the blower 3 is operated by its lower limit temperature detector, and the cold air in the room A is transferred to the heat radiation pipe 4. This acts to recover the heat stored in the surrounding soil 5 during the day and raise the temperature of the room A. However, even in such heat storage type greenhouses, the amount of heat stored during the day is small due to rainy weather, etc.
There may be cases where it is necessary to use the interior heater 8 at night, and the interior heater 8 is operated to continue recovering the heat stored in the soil 5 during the day by operating the fan 3 at night, and when the recovery is finished. This is when the temperature in room A will drop even further.

Of course, when the heater 8 starts operating in the final state of heat storage recovery, the room temperature rises, and if this room temperature happens to become higher than the soil temperature around the heat dissipation pipe 4, the air will not be blown in by the blower 3. In turn, heat will be given to the soil 5 from the air. In other words, the soil 5 is heated by the heater 8, which consumes a large amount of expensive fuel, resulting in uneconomical operation.

In this invention, in order to make such an uneconomical heat storage effect by the heater, the above-mentioned heat dissipation pipe 4 is
The feature is that the temperature around the pipe 4 is detected, and if the temperature in the room A becomes higher than the temperature around the pipe 4 when the heater is in operation, the operation of the blower 3 is stopped. Therefore, in the case of this invention, when the blower 3 is stopped, indoor air specially heated by the heater 8 is not sent into the radiation pipe 4, and the heat from the heater 8 is economically used only for raising the room temperature. will be done. If the blower 3 and heater 8 are operated at the same time, the temperature around the heat radiation pipe 4 is higher than the temperature in the room A, so in this state, heat is recovered from the soil 5 and by the heater 8. It helps to quickly raise the room temperature in both heating and heating operations.

Figure 3 shows an embodiment of the temperature control circuit of this invention as described above, and 9 in the figure is an upper limit temperature switch that detects the temperature of the room A and closes when the temperature exceeds a predetermined upper limit temperature. For example, it will close at 25℃ or above, and this closing will cause magnetic switch 1 to close.
2, the blower 3 is driven to store the desired heat. 10 is a lower limit temperature switch that detects the temperature of the room A and closes when the temperature falls below a predetermined lower limit temperature, for example, when the temperature falls below 10°C. Further, reference numeral 11 is a heat storage temperature switch that detects the heat storage temperature of the relevant part around the heat dissipation pipe 4 and closes only when the temperature is lower than the predetermined upper limit temperature in the room and higher than the lower limit temperature. They are connected in series, and when both switches 10 and 11 are closed, the magnetic switch 12 is closed, and in this state, the blower 3 is driven.

In other words, this operating state is a heat storage recovery operation state in the room A, and therefore, the recovery of heat storage is impossible, and when the indoor temperature is rising due to the operation of the heater 8, this circuit is automatically cut off and the heating device 8 Heating will be used exclusively to increase the temperature in the room A.

Since the temperature control device of this invention is configured as described above, it not only stores heat during high temperatures during the day and recovers heat during low temperatures at night, but also stores heat energy during the process of increasing indoor temperature due to the use of a heater. is effectively used exclusively for raising the indoor temperature, thereby making it possible to economically control the temperature of the greenhouse.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional heat storage type greenhouse. Figure 1 is a cross-sectional view, and Figure 2 is the - in Figure 1.
The sectional view and FIG. 3 are circuit diagrams showing the temperature control device for the greenhouse according to this invention. In the figure, 3 is a blower for internal air circulation in room A, 4 is a heat storage heat dissipation pipe buried underground in room A, 9 is an indoor upper limit temperature switch, 10 is also a lower limit temperature switch, and 11 is a heat storage temperature switch. shows. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a greenhouse that uses a heater in combination, the temperature in the greenhouse is controlled by the above-mentioned indoor circulating air that passes through a heat storage radiation pipe buried underground, and the above-mentioned room A is operated at temperatures above the upper limit setting temperature and below the lower limit setting temperature. An upper limit temperature switch 9, a lower limit temperature switch 10, and a heat storage temperature switch 11 that operates at a predetermined heat storage temperature that is higher than the lower limit set temperature around the heat radiation pipe 4 are provided. The blower 3 for internal air circulation is driven to store heat around it through the heat radiation pipe 4 with exhaust air from the room, and the blower 3 is activated when both the lower limit temperature switch 10 and the heat storage temperature switch 11 are activated.
A temperature control device for a heat storage type greenhouse, characterized in that the heat stored during the high temperature is returned to the room A by circulating air passing through the pipe 4.