JPH0664443U - Greenhouse heating device - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a greenhouse warming device with an excellent function of adjusting the temperature inside the greenhouse. [Structure] A base plate 2 having a central opening 5, a heater 3 installed on the base plate, a water tank 4 placed on the upper surface of the base plate,
A warming device for a greenhouse, which is provided with a blower fan 6 installed in a central opening of a base plate to blow air downward, and a temperature controller 8 for detecting the temperature in the greenhouse and controlling energization of a heater. The temperature controller 8 is a variable thermostat, and the fan 6 for blower is used.
It will be installed in the downstream area of, and its installation position will be closer to the center than the heater.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a greenhouse warming device having an excellent temperature control function.

2. Description of the Related Art As a heating device used in a small greenhouse for home use, as described in Japanese Utility Model Publication No. 3-12743, a water tank is placed on the upper surface of a base plate and a bottom portion is installed. A heater is installed in the greenhouse, a temperature controller that detects the temperature inside the greenhouse and controls the electricity to the heater is set in an appropriate place inside the greenhouse, and air is blown upward through the opening in the center of the base plate. It is known that a fan is attached. According to this greenhouse heating device, the water in the water tank is heated by the heater to humidify the inside of the greenhouse, and the blower fan blows up the air warmed by the heater upwards and convectively stirs inside the greenhouse. However, the temperature and humidity inside the greenhouse can be kept constant at all times.

[0003]

[Problems to be solved by the device]

 In the above conventional greenhouse heating device, since warm air is blown upward, warm air accumulates in the upper part of the greenhouse and convection tends to be stagnant, and high and low temperature layers are easily formed in the upper and lower parts of the greenhouse. . Therefore, by reversing the blowing direction of the blower fan so that the air inside the greenhouse is taken in from above and blown out downward, the air flowing under the base plate towards the surroundings is warmed by the heater, and the warm air is heated. The air that has risen along the outer wall of the plant, while the cooled air descends toward the blower fan, and the convection is relatively smoothly performed, and the temperature inside the greenhouse can be kept almost uniform.

However, the improved greenhouse heating device also has the following problems. Although the temperature controller is installed in a suitable place in the greenhouse, convection in the greenhouse is not always uniform, and temperature unevenness occurs depending on the location. The temperature may not be representative of the greenhouse temperature. As a temperature controller, a bimetal type thermostat or an electronic thermistor is used to detect and control the temperature.However, the former has a fixed set temperature and is difficult in terms of accuracy. It lacks electrical insulation and lacks safety and durability in a greenhouse where the humidity is high and condensation is likely to occur. The wiring of the temperature controller has to be inside the greenhouse, and in the case of an electronic thermistor, it is necessary to set it on the upper part where water is not splashed, which makes the wiring complicated.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above-mentioned problems of the prior art, and includes a base plate having a central opening, a heater installed on the base plate, a water tank mounted on the upper surface of the base plate, and a base plate. In a greenhouse warmer equipped with a ventilation fan installed in the central opening of the greenhouse that blows downward, and a temperature controller that detects the temperature inside the greenhouse and controls the energization of the heater, the temperature controller is used for ventilation. The feature is that it is installed in the downstream area of the fan and the installation position is closer to the center than the heater. In a more specific embodiment, the temperature controller is a variable temperature type thermostat.

[0006]

[Action]

 In the present invention, since the temperature controller is installed in the downstream region of the blower fan, the temperature controller is constantly exposed to the air blown from the blower fan and detects its temperature. Since the temperature controller of the present invention is installed near the center of the heater, it detects the temperature of the air before it is heated by the heater.

[0007]

【Example】

 Next, the present invention will be described more specifically with reference to FIGS.

The greenhouse warming device 1 shown here is suitable for a small greenhouse for home use, and includes a base plate 2, a heater 3 attached to the lower surface of the base plate 2, and water placed on the upper surface of the base plate 2. The tank 4, a blower fan 6 installed in the central opening 5 of the base plate 2 to blow air downward, the temperature controller 8 attached to the lower surface of the base plate 2 via the attachment piece 7, and the set temperature of the temperature controller 8. It comprises a setting device 9 that determines the degree, a frame 10 that supports the four corners of the base plate 2, a back plate 11 that covers the entire lower surface of the heating device 1, and the like. The water tank 4 has a substantially ring shape, has a central opening 12, and has water holes 13 and water supply / drain holes 14 in the upper part.

As shown in the wiring diagram of FIG. 3, the temperature controller 8 used is a variable type thermostat in which a thermostat 15 and a small heater 16 are sealed in one plastic case, and the knob of the setting device 9 is turned. By setting the amount of electricity to the small heater variable, it is possible to set a desired temperature. Since this variable thermostat is highly accurate and can be made waterproof, it is an excellent temperature controller for greenhouses.

In this greenhouse heating device 1, the air blown downward from the blower fan 6 flows laterally around the space sandwiched between the base plate 2 and the back plate 10 and is heated by the heat of the heater 3 on the way. As a result, hot air is blown from the heating device 1 to the surroundings and rises along the outer wall of the greenhouse (indicated by an arrow). The water in the water tank receives heat from the heater 3 via the base plate 2 to humidify the inside of the greenhouse. The temperature controller 8 receives the air blown from the blower fan 6, detects the temperature of the air, and turns on / off the power supply to the heater 3 to automatically keep the temperature inside the greenhouse constant.

As can be seen from this embodiment, in the present invention, the temperature controller 8 is installed in the lower flow region of the blower fan 6, that is, the place where forced convection is performed, so that it is affected by temperature unevenness in the greenhouse. It becomes possible to detect the average temperature at all times, and the heat transfer from the air in the greenhouse to the temperature controller 8 becomes active, so that the thermostat 15 reacts sensitively to the temperature in the greenhouse (especially when turning off → on). ) It becomes like this.

Furthermore, since the temperature controller 8 is installed using the mounting piece 7 with a space between it and the base plate 2, it is said that the temperature of the base plate 2 heated by the heater 3 is not directly received. There is an advantage, and since the installation position is closer to the center than the heater 3, the temperature of the air before being heated by the heater can be detected. Therefore, more accurate temperature detection becomes possible. In this embodiment, the temperature controller 8 is attached to the base plate 2 via the attachment piece 7, but the means for installing the temperature controller 8 at a distance from the base plate 2 may be any other means. .

[0013]

[Effect of device]

 According to the present invention, since the temperature controller is installed in the forced convection area by the blower fan, the temperature controller reacts sensitively to the temperature inside the greenhouse, and is always averaged without being affected by the temperature unevenness inside the greenhouse. The temperature can be detected. Further, since the installation position is located closer to the center than the heater, the temperature of the air before being heated by the heater is detected, which enables more accurate temperature detection.

[Brief description of drawings]

FIG. 1 is a plan view of a greenhouse heating device according to an embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a wiring diagram of the greenhouse warming apparatus according to the embodiment.

[Explanation of symbols]

 1 greenhouse heating device 2 base plate 3 heater 4 water tank 5 central opening of base plate 6 blower fan 8 temperature controller (variable thermostat) 9 temperature setting device 11 back plate 12 central opening of water tank 13 water hole 15 Thermostat 16 small heater

Claims (2)

[Scope of utility model registration request] 1. A base plate having a central opening, a heater installed on the base plate, a water tank placed on the upper surface of the base plate, a fan for blowing air downwardly installed in the central opening of the base plate, Also, in a greenhouse warming device equipped with a temperature controller that detects the temperature inside the greenhouse and controls the energization of the heater, the temperature controller is installed in the downstream area of the fan and the installation position is higher than that of the heater. A warming device for greenhouses, which is characterized by being closer to the center. 2. The warming device for a greenhouse according to claim 1, wherein the temperature controller is a temperature-variable thermostat.