JPH0590150U - Garden heater - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the time from extinguishing to the next ignition. [Constitution] The room temperature control means 12 causes the burner 6 to intermittently burn, and the blower control means 13 drives the blower 2 to heat the room to a desired temperature. After extinguishing the fire,
In the range where the room temperature does not exceed the high temperature value, the continuation unit 15 continues the operation of the blower 2. When the blower 2 is driven in this way, the form of the vertical temperature distribution is maintained in a state similar to that at the time of combustion, and the temperature near the ground surface does not drop quickly, so that the number of fire extinguishing / ignition decreases.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a horticultural heater suitable for heating greenhouses and greenhouses.

[0002]

[Prior Art]

 This type of conventional horticultural heater is equipped with a temperature sensor that detects the room temperature and a means that controls the heating power of the burner or ignition / extinction in order to maintain the desired temperature set by the user. During combustion of the burner, a blower that drives the combustion heat to the outside was driven.

[0003]

[Problems to be solved by the device]

 By the way, when the room temperature reaches a desired temperature due to combustion, the burner extinguishes, but the blower also stops along with this extinguishing, and the following problems occur. That is, convection disappears, warm air gathers upward, the temperature near the surface of the earth quickly drops, and the time from fire extinguishing to ignition is shortened. It impairs durability. This invention was made for the purpose of solving the problems.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a temperature sensor for detecting room temperature, a burner, a room temperature control means for controlling combustion of the burner to maintain the room temperature near a desired temperature, and a combustion heat of the burner. In a device having a blower that is blown out of the device and a blower control means that controls the operation of the blower, a setting means for setting a high temperature value higher than the desired temperature and a blower It is provided with a continuation means for continuing the drive.

[0005]

[Action]

 With the above configuration, even if the room temperature reaches the set temperature and the burner extinguishes, the blower continues to operate as long as the room temperature does not exceed the high temperature value. In other words, the temperature distribution in the vertical direction is maintained almost as it was due to the continued convection during the extinguishing of the fire, which increases the time until the next ignition.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a horticultural heater housing. A blower 2 is provided on the rear surface of the housing 1, a blower outlet 3 is provided on the front surface thereof, and a combustion chamber 4 is provided at an intermediate position therebetween. A burner 6 for burning the vaporized gas of kerosene supplied from the vaporizer 5 is disposed below the combustion chamber 4, and the vaporizer 5 is connected to an oil feed pump 8 via an oil feed pipe 7.

Reference numerals 9 and 10 are up / down switches for setting a desired temperature, 11 is a temperature sensor installed at the air intake of the blower 2 for detecting room temperature, and 12 is a burner 6 for igniting and extinguishing the burner 6. Room temperature control means for maintaining the room temperature around a desired temperature. The room temperature control means 12 may be configured to calculate the thermal power based on the desired temperature and the room temperature and burn the burner 6 with the calculated thermal power. A blower control unit 13 controls the operation of the blower 2. Reference numeral 14 is a setting means for setting a high temperature value which is, for example, 3 ° C. higher than the desired temperature. Reference numeral 15 is a continuation means for comparing the room temperature with the high temperature value and continuing the operation of the blower 2 when "room temperature≤high temperature value". The above-mentioned room temperature control, blower control, setting, and continuation means are described outside the housing 1. However, this is for the purpose of making the explanation easy to understand, and the control inside the housing 1 is actually used. It is configured on a substrate (not shown).

In the above configuration, when the outside air temperature is lower than the desired temperature T as shown in FIG. 2A, the room temperature gradually decreases. Therefore, the room temperature control means 12 controls the oil feed pump 8 based on the room temperature to pressure-feed the kerosene to the vaporizer 5, supplies the vaporized gas to the burner 6 for intermittent combustion as shown in FIG. Since the blower control means 13 drives the blower 2 and sends the combustion heat as hot air from the outlet 3, the room temperature is maintained near the desired temperature T.

By the way, the room temperature when the outside air temperature is low does not exceed the high temperature value U because it starts to drop immediately after the fire is extinguished. Therefore, the continuation unit 15 keeps the blower control unit 13 operating, so that the blower 2 is driven even though the fire is extinguished as shown in FIG. 2 (C). When the blower 2 is driven in this manner, the room temperature changes somewhat, but the vertical temperature distribution maintains a substantially identical form as shown in FIG. In other words, as described in the conventional example, the problem that the temperature near the ground surface quickly decreases and the time until reignition is shortened is effectively prevented, so that the generation of kerosene odor can be suppressed and the durability of the device can be reduced. It also has a good effect on.

Next, when the outside air temperature starts to rise, the combustion time is gradually shortened, and finally the room temperature is maintained at the set temperature T or higher even without combustion. Then, when the room temperature becomes equal to or higher than the high temperature value U, at the same time, the continuation unit 15 is stopped and the blower 2 is also stopped. When the blower 2 stops, the vertical temperature distribution changes and the temperature near the ground surface becomes relatively low. However, since there is a sufficient amount of heat in the room to maintain the desired temperature T, the room temperature is less likely to fall below the desired temperature T. That is, after the blower 2 is stopped, the horticultural heater is not operated for a while. Then, when the room temperature again becomes equal to or lower than the desired temperature T while the operation is stopped, the burner 6 burns and the blower 2 is started to maintain the room temperature near the desired temperature T as described above.

In the above-described embodiment, the burner repeats ignition and extinguishing. However, even in the case of a type in which the heating power is freely changed, when the rise in room temperature cannot be suppressed with the minimum heating power, It goes without saying that the same explanation will be given if it is configured to extinguish the fire.

[Effect of the device]

 As described above, the horticultural heater of the present invention has a configuration in which a high temperature value higher than the desired temperature is set, and the blower continues to be driven even if the fire is extinguished in a range where the room temperature does not exceed this high temperature value. Therefore, there is almost no difference in the form of the vertical temperature distribution between burning and extinguishing, the time from extinguishing to the next ignition becomes longer, and the number of ignition / extinguishing decreases, so that the generation of odor can be suppressed, It has a remarkable effect of improving the durability of the device.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a horticultural heater according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining room temperature, burner combustion, and blower drive in the same time series.

FIG. 3 is a diagram illustrating a vertical temperature distribution in a heating room.

[Explanation of symbols]

 2 Blower 6 Burner 11 Temperature Sensor 12 Room Temperature Control Means 13 Blower Control Means 14 Setting Means 15 Continuation Means

Claims (1)

[Scope of utility model registration request] 1. A temperature sensor for detecting room temperature, a burner,
What is desired is one having a room temperature control means for controlling the combustion of the burner to maintain the room temperature near a desired temperature, a blower for sending the combustion heat of the burner to the outside of the device, and a blower control means for controlling the operation of the blower. A horticultural heater characterized by comprising setting means for setting a high temperature value higher than the temperature and continuation means for continuing the drive of the blower within a range where the room temperature does not exceed the high temperature value.