JPH0816553B2 - Hot air heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an open combustion type hot air heater.

2. Description of the Related Art In recent years, warm air heaters equipped with fans have rapidly spread, and various combustion energies such as oil and gas are used as heat sources in addition to electricity. Further, due to the need for space saving of these heaters, downsizing of the main body is required.

 Hereinafter, a conventional warm air heater will be described with reference to the drawings.

FIG. 2 shows a conventional hot-air heater. 1 is a burner for burning gas, oil, etc., 2 is a rear heat shield, 3 is a lower heat shield, 4 is an upper heat shield, 5 is a heat shield. Front heat shield, 6 is a convection fan, 7 is a fan case, 8 is a body case, 9 is an intake filter, 10 is an inlet, 11 is an outlet, 2a, 3a, 4a,
5a and 7a are airways.

The operation of the warm air heater configured as described above will be described.

The fan 6 starts rotating, and the air necessary for combustion and the air that is converted into heat are taken into the main body case 8 from the outside through the intake filter 9 through the intake port 10. The sucked air is warmed by the heat generated by the burner 1 burning gas and the like while passing through the air passages 2a, 3a, 4a, 5a, 6a. The warmed air is discharged from the air outlet 11 via the fan 6. The air passing through 2a and 3a is also used as the 1.5th primary air and the secondary air required for combustion.

Problems to be Solved by the Invention However, in the conventional configuration, the intake port 10 is a curtain or the like for the air passage.
If the vicinity of the inlets 10a of 2a and 3a is blocked, the air will be
Although it enters from the upper part of 0 along the rear part of the rear heat shield plate 2, the airflow resistance of the airflow passage 2a is larger than that of the airflow passage 3a, so the air volume of the airflow passage 2a is smaller than that of the airflow passage 3a. Therefore, there is a risk that the flame of the burner may cause incomplete combustion on the rear heat shield plate 2 side, or the flame may contact the rear heat shield plate 2 to generate toxic carbon monoxide or the like.

The present invention solves the above-mentioned conventional problems, and provides a safe combustion that does not generate toxic gas by supplying air that enters through the gap of the appliance even when the intake port is partially blocked or the entire intake port is blocked. The purpose is to provide a hot air heater.

Means for Solving the Problems In order to achieve the above object, the warm air heater of the present invention has a slit for taking in auxiliary combustion air into the rear heat shield plate at a position substantially equal to the height of the flame hole of the combustion burner. It has a small area such as an opening.

Effect The present invention has the above-described configuration and takes in auxiliary air from the opening provided in the rear heat shield along the intake port, and not only during normal use, but also when a part of the intake port is closed. It is possible to prevent complete combustion.

Example 1 FIG. 1 is a configuration diagram showing an example of the present invention, in which 1 is a combustion burner, 2 is an auxiliary air port 2b, and the auxiliary air port 2b is formed continuously from this.
It is a rear heat shield plate provided with a protrusion 2c for guiding the auxiliary air to the flame of the combustion burner 1, and is provided upright at the rear of the combustion burner 1. Reference numeral 3 denotes a substantially L-shaped lower heat shield plate provided over the lower portion and the front portion of the combustion burner 1, and has a protrusion portion 2b on the front side so as to face the protrusion portion 2c. An upper heat shield plate 4 covers the upper opening of the combustion chamber 1a formed by the rear and lower heat shield plates 2 and 3, and forms gaps A and B in the front and rear. 5
Is the heat shield plate, and an air passage 5a is formed between the upper and lower heat shield plates 3 and 4. Each of the heat shield plates 2 to 5 constitutes a heat exchanger and warms the inhaled external air while passing through the heat exchanger. Further, the auxiliary air port 2b is located at a height position approximately equal to the height of the flame hole of the combustion burner 1 and is an opening having a small area such as a slit. 6 is a convection fan, 7 is a fan case, 8 is a main body case, 9 is an intake filter, 10 is an inlet, and 11 is an outlet.

The operation in the above configuration will be described. During operation of the hot air heater, the vicinity of the inlets 10a of the air passages 2a, 3a is blocked by curtains or the like, and the air passage resistance of the air passage 2a becomes large.
Even if the amount of air passing through the air passage 2a becomes smaller than the amount of air passing through the air passage 3a, the air sucked from the upper part of the intake port 10 and guided between the rear heat shield plate 2 and the filter 9 is the rear heat shield plate. 2 is supplied to the flame of the combustion burner 1 through the auxiliary air port 2b provided on the No. 2 along the protrusion 2c, and it is possible to compensate for the lack of the combustion air amount and the imbalance, and to prevent the incomplete combustion caused by the blockage. It is possible. In addition, not only at the time of blockage,
Since air is also sucked in from the auxiliary air port 2b during normal times, the length of the flame of the combustion burner 1 is shortened, and the combustion performance can also be improved.

EFFECTS OF THE INVENTION As described above, according to the present invention, by providing an auxiliary air port in the rear heat shield plate near the intake port, it is possible to improve the combustion performance under normal conditions by the air flowing in from this auxiliary air port. Of course, incomplete combustion can be prevented even when the intake port is partially blocked, and the safety of the combustion type hot air heater can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a conventional hot air heater. 1 ... Combustion burner, 2 ... Rear heat shield, 2b ... Auxiliary air port, 6 ... Convection fan, 10 ... Intake port, 10a ... Air passage 2
a, 3a entrance, 11 …… blowout.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahisa Tokunaga 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 60-2844 (JP, A) Actual development Sho 59-115249 (JP, U)

Claims (1)

[Claims] 1. A main body case having a hot air outlet, an intake port for introducing combustion air and warm air, and a burner provided in the main case for mixing fuel and combustion air for combustion. And a small-area auxiliary air port that covers the rear side of the burner and is in the same height as the burner flame hole and that communicates with the intake port to take in external air, and the upper part of the auxiliary air port. A rear heat shield provided with a guide for a projection that guides the air taken in to the burner flame, covers the front side and the lower side of the burner, and communicates with the intake port to form an inlet at the bottom of the rear heat shield. The lower heat shield plate provided with guides for the protrusions at positions facing the protrusions of the rear heat shield plate, the upper side of the burner, and the front side of the rear heat shield plate and the lower heat shield plate. An upper heat shield plate having an air passage communicating with the intake port between A heat exchanger composed of a front heat shield plate having an air passage communicating with the air passage and the air outlet between the partial heat shield plate and the front surface of the lower heat shield plate, and a convection fan. Hot air heater.