JPH0534443U - Open heater - Google Patents

Abstract

(57) [Summary] [Purpose] Oxygen concentration is accurately detected over a long period of time,
Allow efficient ventilation. [Structure] The output value of the O2 sensor 1 is input to the alarm means 8 and an alarm is output when the value is lower than the reference value, so that the user can efficiently perform ventilation. Further, if the switch 5 is operated when the inside of the room is equal to normal air, the reference value is updated, and the influence of the change over time of the O2 sensor 1 can be eliminated, so that the accuracy of the O2 sensor 1 can be favorably maintained for a long period of time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an open type heater such as an oil fan heater.

[0002]

[Prior Art]

 In general, this type of open-type heater consumes oxygen in the indoor air for its combustion, and at the same time, the combustion gas is discharged indoors. For this reason, especially in a well-sealed room, the oxygen concentration gradually decreases due to continued combustion, causing incomplete combustion. Ventilation should be performed occasionally (1-2 times per hour) to obtain fresh air. The user is instructed to replenish. .

[0003]

[Problems to be solved by the device]

 By the way, when ventilating, it is necessary to endure cold for a short time when cold air flows in, and the comfort of the room is impaired because the indoor temperature is not stable for a while. Therefore, I would like to avoid ventilation if possible, but since information such as the oxygen concentration in the room is not provided, the reality is that ventilation is performed even in a room where the oxygen concentration does not decrease. The present invention has been made in view of the above-mentioned problems, and its purpose is to inform the user that the aeration is desired, and to maintain the oxygen concentration detection accuracy satisfactorily for a long time. It is to provide an open type heater that can.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention compares an O2 sensor for detecting the oxygen concentration in a room with an output value of an O2 sensor and a reference value, and outputs an alarm when the output value <reference value. It employs a configuration having means and a switch for updating the reference value. The reference value and the output value are corrected to a value at a predetermined temperature by the correction means, and the corrected value is input to the alarm means.

[0005]

[Action]

 With such a configuration, it is only necessary to open windows etc. when the alarm means outputs an alarm, so efficient ventilation can be achieved, and the standard value can be updated by operating the switch when the room is in normal air. As a result, even if the O2 sensor changes over time, the oxygen concentration can be accurately detected over a long period of time.

[0006]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In FIGS. 1 and 2, 1 is a galvanic battery type O 2 sensor provided on the rear surface of the housing 3 of the fan heater 2 for detecting the oxygen concentration in the room, 4 is a temperature sensor for detecting room temperature, and 5 is a reference value ( For example, switches for updating the oxygen concentration (value corresponding to 19.5%), and these sensors and switches are connected to the control unit 6. The control unit 6 has a correcting means 7 for correcting the reference value and the output value of the O2 sensor to a value at a predetermined temperature (for example, 20 ° C.), compares the reference value with the output value, and gives an alarm when the output value <the reference value. The alarm means 8 for outputting is configured. Note that 9 is a warm air fan, 10 is an outlet, and 11 is a burner.

Next, the operation of the above configuration will be described. When a power source (not shown) is turned on, the burner 11 starts burning for a while. Then, the warm air fan 9 is driven to discharge the warm air from the outlet 10, the thermal power of the burner 11 is changed to maintain the room temperature at the set temperature, and the combustion consumes oxygen in the room. Therefore, the output value of the O2 sensor 1 gradually decreases according to the characteristics shown by the solid line in FIG.

During the above combustion, when the output value finally becomes equal to or less than the reference value, the alarm means 8 operates, so that an alarm such as a display or a sound is output. Then, the user performs ventilation and the oxygen concentration is quickly restored to 21% which is the concentration in normal air, so that complete combustion is continued. Of course, there is no need to ventilate, because the alarm is not output when the oxygen concentration does not decrease significantly due to poor room airtightness.

By the way, the O 2 sensor 1 changes with time, that is, the characteristics gradually change from the solid line to the dotted line in FIG. Therefore, if the reference value is not calibrated, an alarm will be output even if the oxygen concentration is slightly decreased, so operate switch 5 when the room is in normal air, such as when using the equipment. . When this operation is performed, the output value is a value corresponding to the oxygen concentration of 21%, and the reference value is newly set based on the value, so that the influence of the change over time of the O 2 sensor 1 can be eliminated, The oxygen concentration can be accurately detected over a long period of time.

Further, the output value of the O 2 sensor 1 also changes depending on the room temperature as shown in FIG. Therefore, it is also effective that the correction means 7 corrects each of the output value input to the alarm means 8 and the reference value to a value at a predetermined temperature to cancel the error caused by the temperature. In this case, the oxygen is used. It goes without saying that the density detection accuracy is further improved.

Although the number of reference values is one in the above-described embodiment, a plurality of reference values may be used, and the first reference value is used for the output determination of the alarm as described above, and the second reference value is used for ventilation, that is, The configuration used for determining whether or not the oxygen concentration is sufficiently high is arbitrary. Moreover, the switch 5 may be an existing switch as long as it is adapted to a special operation (for example, pressing for several seconds).

[0012]

[Effect of the device]

 As described above, the open type heater of the present invention is an alarm that outputs an alarm when the output value of the O2 sensor that detects the oxygen concentration in the room is compared with the reference value and the output value <reference value. And a switch for updating the reference value. As a result, ventilation can be efficiently performed by opening windows etc. according to the output of the alarm, and the reference value can be easily updated by operating the switch, so that the oxygen concentration detection accuracy can be maintained good for a long time.

Further, since the reference value and the output value are corrected to values at a predetermined temperature by the correction means and the corrected values are input to the alarm means, the error caused by the temperature is not included and the alarm means is more accurate. A number of effects can be achieved, such as outputting an alarm to.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an open type heater according to an embodiment of the present invention.

FIG. 2 is a sectional view of an open type heater according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a relationship between oxygen concentration and an output value of an O 2 sensor.

FIG. 4 is a diagram illustrating a relationship between room temperature and an output value of an O 2 sensor.

[Explanation of symbols]

 1 O2 sensor 5 switch 7 correction means 8 alarm means

Claims (2)

[Scope of utility model registration request] 1. An open-type heater that takes in indoor air and burns it, discharges the resulting combustion gas into the room, and keeps room temperature at a set temperature. An open-type heating machine having alarm means for comparing an output value with a reference value and outputting an alarm when the output value <reference value, and a switch for updating the reference value. 2. The open type heating machine according to claim 1, wherein the reference value and the output value are corrected to values at a predetermined temperature by the correction means, and the corrected values are input to the alarm means.