JPH0737097Y2 - Safety device for hot air heater - Google Patents

Description

[Detailed Description of the Invention] [Outline] A safety device for a warm air heater, more specifically, a safety of the warm air heater used for heating a greenhouse for facility gardening when a warm air duct is combined with the heater. Regarding the device for heating, when heating a vinyl greenhouse that combines a duct with a warm air heater, reduce the resistance of the duct so that the heater is overheated rather than normal even if it is not abnormally overheated. The combustion gas generated in the combustion chamber 33 is discharged to the outside of the greenhouse 11 for facility gardening by the chimney 40 for the purpose of providing a means for preventing it.
20 is a warm air heater together with a burner circuit 18 and a blower circuit 19.
The hot air heater 30 is housed in the control panel 32, and the inside air is taken in from the air intake port 42 by the blower 41 arranged outside the main body of the hot air heater, and the temperature generated by the hot air heater is The air flows from the hot air outlet 43 to the main duct 12 connected to the hot air outlet.
And the pressure detector 21 is provided in the greenhouse through the branch duct 13, the pressure detector 21 is arranged in the hot air outlet 43, the pressure detector 21 when the flow of warm air through the main duct 12 and the branch duct 13 is obstructed. It comprises a safety device for a hot air heater characterized in that it activates and sends a warning signal to the safety circuit 20.

[Industrial application field]

The present invention relates to a safety device for a warm air heater, and more particularly to a device for ensuring the safety of a warm air heater used for heating a greenhouse for greenhouses when a warm air duct is combined with the warm air heater.

[Conventional technology]

Greenhouse for horticulture (hereinafter abbreviated as greenhouse)
An oil (heavy oil, kerosene) fired hot air heater is used for heating. FIG. 2 shows an oil-fired hot air heater 30 developed by the applicant.
In the figure, (a) is a front sectional view and (b) is a side sectional view. In the figure, 31 is a burner, 32 is a control panel, 33 is a combustion chamber, 34 is a flame, 35 is a smoke pipe, and 36 is a screw. Plate, 37 is smoke chamber,
38 is a smoke chamber lid, 39 is a flue elbow, 40 is a chimney, 41 is a blower,
42 is an air blowing port and 43 is a warm air blowing port.

In use, the combustion chamber 33 is heated by the flame 34 generated by the burner 31, and the hot air in the combustion chamber 33 causes the smoke tube 35,
It is exhausted in the direction of arrow I through the smoke chamber 37 and the chimney 40. Air is taken in from the air blow-in port 42 by the blower 41 as shown by an arrow II, and this air flows around the smoke pipe 35 and the combustion chamber 33 to become warm air by heat exchange, and the warm air blowout port.
It is blown out from 43 in the direction of arrow III and discharged into the greenhouse to heat the greenhouse.

The hot air heater described above is used alone as shown in FIG. 2, and in addition to the hot air duct shown in the plan view of FIG. 3 in order to uniformly send hot air to the entire greenhouse. It may be used in combination with. In FIG. 3, 11
Is a greenhouse for greenhouses called a greenhouse, 12 is a main duct attached to the hot air outlet 43 of the warm air heater 30, 13
Is a branch duct connected to the main duct. The vinyl house is a large one with an area of over 990 m ² (300 tsubo).
The warm air duct is made of a flexible material such as vinyl or polyethylene and is flat when the warm air heater stops and does not blow air, but it opens when the warm air heater operates and starts blowing air. Send the expanded warm air. The end of the branch duct 13 far from the main duct 12 becomes an open end 14 through which warm air is blown out.

[Problems to be solved by the device]

By the way, the number and thickness of the hot air ducts are set so that the resistance at the hot air outlet is the smallest. The duct, which is flat and placed on the ground when not blowing air, should be inspected prior to warm air blowing, but if neglected, the duct that twists and cannot be blown will be overlooked. Resistance increases, the amount of warm air delivered from the hot air outlet decreases, and the outlet air temperature rises, which causes overheating of the heater. A similar problem occurs when less than the set number of ducts are used or the diameter of the used ducts is smaller than the set value. The hot air heater duct is installed every heating season and removed during the off season as it interferes with farm work. Since this effort is great, the incidence of the above-mentioned problems is high.

If combustion continues with the resistance of the hot air heater 30 on the hot air outlet 43 side increased, the combustion chamber 33 of the hot air heater may overheat abnormally, which may cause a fire. Conventionally, a method of detecting the temperature of the combustion chamber or the temperature in the heater and stopping the combustion when the temperature is high is used. To do this, one thermostat and limit switch 15 is attached to the outer wall of the combustion chamber as shown in FIG. The limit switch is configured such that when the outer plate is overheated abnormally, the contacts are separated, the burner is stopped urgently, and when the temperature of the outer plate becomes low, the limit switch is automatically restored. The method using the limit switch is effective for preventing danger, but when the resistance on the hot air outlet side slightly increases without extremely increasing, the heater can body continues to be in some overheated state even if it is not abnormal. If such a weak overheat is received for a long time,
Cracks, holes, etc. are formed in the heater can body, shortening the life of the heater. In addition, if the exhaust gas leaks from the above-mentioned holes and holes and the exhaust gas fills the greenhouse,
Exhaust gas is the worst thing for crops and can cause crops to die. The limit switch, which is the final warning means, is ineffective against such overheating.

Therefore, the present invention detects the resistance of the duct in the heating of a greenhouse that is a combination of a hot air heater and a duct, and prevents the heater from becoming overheated than normal even if it is not abnormally overheated. The purpose is to provide a means of doing.

[Means for Solving the Problems]

In the hot air heater 30 in which the combustion gas generated in the combustion chamber 33 is discharged to the outside of the greenhouse 11 for facility gardening by the chimney 40, the safety circuit 20 includes the burner circuit 18 and the blower circuit 19, and the hot air heater 30. Stored in the control panel 32 of the hot air heater 30
The outside air is taken in from the air suction port 42 by the blower 41 arranged outside the main body of the warm air heater, and the warm air generated by the warm air heater is connected from the warm air outlet 43 to the warm air outlet. The pressure is supplied to the greenhouse through the main duct 12 and the branch duct 13, the pressure detector 21 is arranged at the hot air outlet 43, and the pressure is detected when there is an obstruction to the flow of warm air passing through the main duct 12 and the branch duct 13. A safety device for a hot air heater, characterized in that the device 21 is activated to send a warning signal to the safety circuit 20.

[Action]

If the load of the duct becomes large, that is, if the number of ducts is insufficient or the ducts are narrowed in the middle to block the air flow and increase the static pressure inside the warm air heater, The pressure sensor that was placed is activated,
The safety circuit illuminates the warning lamp, prompting the user's attention.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which 16 is a power source, 17 is an operation switch, 18 is a burner circuit, 19 is a blower circuit, 20 is a safety circuit according to the present invention, 21 is a pressure detector, twenty two
Is a warning lamp. The safety circuit 20, pressure detector 21, and warning lamp 22 are removed from the conventional example.In the past, when the operation switch was turned on, the burner circuit 18 and the blower circuit 19 were turned on, and the limit switch 15 was closed and warm air was blown. The heater was operated.

In the present invention, the pressure detector 21 is installed at an appropriate position of the hot air outlet 43 of the warm air heater 30. The static pressure of the blower of the warm air heater is generally displayed as, for example, how many mm of water column (how many mmAq), so it is detected by "water column". The measurement value of the pressure detector 21 is input to the safety circuit 20 using a usual technique, for example, photoelectric means using an optical sensor. The safety circuit 20 is housed in the control panel 32 of the warm air heater 30 together with the burner circuit 18 and the blower circuit 19.

A warning lamp 22 is connected to the safety circuit 20, and the warning lamp 22 may be installed at a place where the caretaker of the vinyl house can easily see it, and the wiring can be made by a usual technique.

By installing the safety circuit 20 as described above, abnormal overheating does not reach, that is, overheating of the warm air heater that does not reach the operation of the limit switch is reliably detected, and the result can be known by the warning lamp. Become.

[Effect of device]

As described above, according to the present invention, the danger of overheating of the warm air heater can be avoided, the life of the warm air heater can can be extended, and the warm air can be properly supplied to the greenhouse, resulting in damage to crops. As a result, the financial burden on the user of the hot air heater is reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a diagram of an oil-fired hot air heater, (a) is a front sectional view, (b) is a side sectional view, and FIG. 3 is a hot air duct. It is a top view of an example of use. In the figure, 11 is a greenhouse, 12 is a main duct, 13 is a branch duct, 14
Is an open end, 15 is a limit switch, 16 is a power supply, 17 is an operation switch, 18 is a burner circuit, 19 is a blower circuit, 20 is a safety circuit, 21 is a pressure detector, 22 is a warning lamp, 30 is warm air heating A machine, 40 is a chimney, and 43 is a hot air outlet.

Continuation of the front page (72) Yusuke Kashiwara, Yusuke Kashiwara, Atsugi Plant, 411, Kamifuruzawa, Atsugi City, Kanagawa Prefecture ) Actual development Sho 56-82030 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A warm air heater (30) in which combustion gas generated in a combustion chamber (33) is discharged to the outside of a greenhouse (11) for greenhouses by a chimney (40), and a safety circuit (20) has a burner circuit. (18) and the blower circuit (19) are housed in the control panel (32) of the warm air heater (30), and are arranged outside the main body of the warm air heater in the warm air heater (30). The outside air is taken in from the air suction port (42) by the blower (41), and the warm air generated by the warm air heater is supplied from the warm air outlet (43) to the main air duct (12) and the branch duct ( The pressure sensor (21) is installed in the hot air outlet (43) through the hot air outlet (43), and the flow of hot air through the main duct (12) and the branch duct (13) is obstructed. And a pressure detector (21) are activated to send a warning signal to the safety circuit (20).