JPS5851544Y2 - Hot air machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot air fan having an air supply path from an air supply port to a burner, and an exhaust path from the burner to an exhaust port.

An example of a conventional warm air fan of this type is shown in FIG. 2.

(Japanese Utility Model Publication No. 50-39010) In this system, air for combustion is sucked in by a blower A from an air supply port B through an air supply path C, and is provided for combustion by a burner D. After combustion, the exhaust gas is transferred to a heat exchanger. E, it is discharged from the exhaust port G via the exhaust path F.

A part of the combustion air before reaching the burner D is guided to the exhaust path F via the bypass path H to reduce the humidity in the exhaust gas and prevent dew condensation.

However, with this configuration, during weak combustion, the amount of exhaust gas to the heat exchanger E is small, the residence time becomes longer and the heat exchange efficiency becomes higher, and the temperature of the exhaust gas decreases and the exhaust gas flows into the exhaust path F.
When condensation is likely to occur in the
Since the amount of air flowing from the air to the exhaust path F decreases, the humidity cannot be significantly lowered and there is a risk that dew condensation will occur.

Therefore, the technical problem of the present invention is to supply a large amount of combustion air to the exhaust path via the bypass path during weak combustion, and the technical means to solve this technical problem is to provide the above-mentioned air supply path. In addition to providing a bypass passage that bypasses the exhaust passage and the exhaust passage, a valve body is provided on the burner side from the connecting portion of the bypass passage of the air supply passage.

According to this technical means, if the air supply path is throttled by the valve body in order to reduce the amount of combustion air to the burner during weak combustion, the bypass passage can be connected to the bypass passage through the bypass passage connection part upstream of the valve body. This allows a large amount of combustion air to flow into the exhaust passage, thereby reducing the humidity in the exhaust passage and preventing the formation of dew condensation.

In addition, according to the present invention, the combustion air that is not supplied to the burner is flowed into the exhaust passage through the bypass passage, so the amount of gas flowing into the exhaust passage is almost constant and the flow velocity hardly changes even during strong combustion or weak combustion. Even if a headwind occurs, it has little effect on the combustion of the burner, unlike conventional methods in which the amount of gas decreases and the flow velocity decreases during weak combustion, and the combustion of the burner remains stable even when there is a headwind. It has the effect of becoming something.

An embodiment of the present invention will be described in detail below.

In Figure 1, 1 has a double pipe structure, and the outside is the air supply path 1.
a, an air supply/exhaust pipe with an exhaust passage 1b on the inside; 2, an air supply pipe connecting the air supply pipe 5 connected to the intake port 4a of the air supply fan 4 of the blower 3 and the air supply passage 1a of the supply/exhaust pipe 1; The air supply fan 4 is fixed to one shaft of the electric motor 6.

An exhaust fan 7 is fixed to the other shaft of the electric motor 6, and the electric motor 6 and the air supply/exhaust fans 4, 7 are covered with a cylindrical casing 8.

A partition plate 9 is provided between the exhaust fan 7 and the electric motor 6 to divide the inside of the casing 8 into two chambers: an air supply fan chamber and an exhaust fan chamber.

The partition plate 9 opens around the shaft of the electric motor 6, and the two chambers are communicated with each other.

10 is a ventilation joint with a circular cross section that connects the outlet 4b of the air supply fan chamber of the blower and the burner case 12 that houses the burner 11 therein; 13 is a circuit provided in the ventilation joint 10 as an example of a valve body; A dynamic damper 14 is a heat exchanger mounted on the upper part of the burner case 12 and connected to the suction lower a of the exhaust fan chamber of the blower, and 15 is a discharge lower b of the exhaust fan chamber and an exhaust passage 1b of the air supply and exhaust pipe 1. An exhaust pipe 16 is an exterior case having an air outlet 17 and a warm air fan motor 18.

The combustion air that has just entered from the air supply path 1a passes through the air supply pipe 2 and the air supply pipe 5, is sucked in by the air supply fan 4, is blown out from the discharge port 4b of the air supply fan chamber a, and then passes through the air supply joint 10 to the burner. 11.

The exhaust gas combusted in the burner 11 passes through the heat exchanger 14, is sucked in by the exhaust fan 7 from the suction lower a of the exhaust fan chamber, is blown out from the discharge lower b, and is blown out from the exhaust pipe 15 and the exhaust path 1b of the supply and exhaust pipe 1. and is released outdoors.

In addition, the air supply fan chamber a and the exhaust fan chamber A are communicated and divided by a partition plate 9, and the discharge port 4b side of the air supply fan chamber A and the suction lower a side of the exhaust fan chamber A are an example of a bypass path. The communication part 1 is connected via the communication part 19 used as the
At No. 9, the pressure in the supply air fan chamber a is higher than the pressure in the exhaust fan chamber a, and a portion of the supply air flows into the exhaust gas.

Therefore, in order to lower the combustion amount, if we move the rotary damper 13 in the ventilation joint 10 to reduce the amount of combustion air supplied to the burner 11, the pressure in the air supply fan chamber a will increase, and the pressure in the exhaust fan chamber will increase. Pressure decreases.

Therefore, the pressure difference in the communication portion 19 of the partition plate 9 increases, and a large amount of combustion air is mixed into the exhaust gas.

Conversely, if the damper 13 is opened to increase the amount of combustion air supplied to the burner 11 in order to increase the amount of combustion, the burner 11. The amount of combustion air flowing through the heat exchanger 14 increases, the pressure difference between the air supply fan chamber a and the exhaust fan chamber a decreases, and the combustion air flows into the exhaust gas through the communication portion 19 of the partition plate 9. The amount you do will decrease.

Also, without installing a fan in the exhaust fan room, the air supply fan 4
By restricting the damper 9, the same condition will be achieved when only the exhaust fan 7 is used without providing a fan in the air supply fan chamber a.

In other words, in order to reduce the amount of combustion, burner 11 and blower 3
When the damper 19 installed between the air supply fan chamber a and the burner 11. Although the flow rate passing through the heat exchanger 14 decreases, the pressure difference between the air supply fan chamber a and the exhaust fan chamber a increases, and the amount of combustion air flowing through the communication portion 19 of the partition plate 9 increases.

For this reason, as mentioned in the conventional example, when the combustion amount is reduced, the exhaust gas tends to condense, but by mixing a large amount of combustion air into the exhaust gas, the water vapor partial pressure (humidity) in the exhaust gas can be reduced. This can reduce condensation and prevent condensation.

In other words, the lower the combustion rate, the more condensation will occur in the exhaust gas, but conversely, the pressure difference between the air supply fan chamber A and the exhaust fan chamber A will become larger, and the amount of combustion air flowing into the exhaust gas will increase. However, it is possible to lower the water vapor partial pressure in the exhaust gas and make it difficult to form condensation.

Furthermore, since dew condensation during weak combustion is eliminated, the thermal efficiency during combustion can be increased and an energy-saving hot air fan can be provided.

Furthermore, since the flow rate flowing through the exhaust pipe increases even if the damper 13 is applied, the flow rate from the communication part 19 increases, so the integrated flow rate hardly changes, there is no decrease in the speed of the wind discharged from the exhaust pipe, and there is no decrease in the wind speed caused by the back wind. 11 There will be no change in combustion.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a hot air fan according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1a...Air supply path, 1b...Exhaust path, 1
0...Blower joint, 11...Burner, 29...Communication part.

Claims (1)

[Scope of utility model registration request] An air supply path leading from the air supply port to the burner and an exhaust path leading from the burner to the exhaust port are provided, and these air supply paths and exhaust path are communicated by a bypass path that bypasses the burner, and the upper air supply path is A hot air fan that has a valve body between the bypass path connection and the burner.