JPH0216129Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an instantaneous water heater that has a heat absorbing section in the upper part and a group of burners in the lower part, and has a combustion chamber inside which is forcedly cooled by air. It is something.

(Prior art) Conventionally, this type of instantaneous water heater was
There is something shown in the publication. To explain this with reference to FIG. 3, a heat absorbing part 2 is disposed in the upper part, a burner group 4 is arranged in the lower part, and a heating cylinder 1 with a combustion chamber 3 formed therein is hermetically surrounded by an outer cylinder 5. An air supply path 6 is formed between the heating cylinder 5 and the heating cylinder 1. A discharge port of a blower 7 is opened in the air supply passage 6, and the air flowing through the air supply passage 6 is communicated with the primary air chamber 8 defining the burner group 4 and the inside of the heating cylinder 1. has been done.

(Problems to be solved by the invention) The above-mentioned conventional device had the following drawbacks.
That is, since all the air supplied for combustion is used to cool the heating cylinder 1, both the primary air and the secondary air are heated and expand in volume, resulting in a lack of air for combustion.

The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a forced air-cooled instantaneous water heater with good combustibility.

(Means for solving the problem) In order to achieve this objective, the present invention has the following configuration.

That is, there is a heating cylinder with a heat absorbing section in the upper part and a burner group in the lower part, and a combustion chamber inside, and an air supply path that surrounds the heating cylinder and the burner group in a sealed manner, and has an air supply path between the heating cylinder and the burner group. A primary air dependent type In the case of a combustor of this type, it is connected to the primary air chamber, and in the case of a combustor that relies on secondary air, it is connected to the heating cylinder.

(Example) An example of the present invention will be described. Items that are the same as the conventional example are omitted. A discharge port 9 of a blower 7 is opened in the air supply path 6, and a communication path 10 is formed through which cold air is directly introduced into the primary air chamber 8 from the discharge port 9. Reference numeral 11 denotes a communication port for supplying secondary air into the heating cylinder 1 from the air passage 6, and is provided on the opposite side to the discharge port 9. 1
2 is an exhaust path.

To explain the operation of the above configuration, air supplied from the blower 7 is divided into the air supply path 6 and the communication path 10 through the discharge port 9. The air that has flowed into the air supply path 6 flows around the heating cylinder 1 while cooling it, and the air flows through the communication port 11.
The air is then supplied into the combustion chamber 3 as secondary air. On the other hand, cold air at room temperature, which does not contribute to cooling, is supplied to the communication path 10 as primary air. In the primary air dependent burner group 4, a set amount of primary air is reliably supplied. The secondary air that cools the heating cylinder 1 is
It is difficult to determine the set amount because the amount of volumetric expansion changes as the amount of combustion increases or decreases, but since there is little dependence on combustion, there is almost no effect of air shortage due to volumetric expansion.

FIG. 2 shows another embodiment in which the burner group 4 is dependent on secondary air, and the communication passage 10 is connected to the heating cylinder so that cold air is supplied as secondary air whose air amount is strictly set. Connected to 1. The communication port 1 is designed to supply air after cooling the heating cylinder to the primary air.
1 opens into the primary air chamber 8. The operation and effect are similar to those shown in FIG.

(Effects of the invention) As described above, the present invention supplies either primary air or secondary air without contributing to cooling in an instantaneous water heater that cools the heating cylinder with forced air. There will be no shortage of air supply.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an embodiment of the present invention;
The figure is a schematic configuration diagram of another embodiment. FIG. 3 is a schematic diagram of a conventional example. 1...Heating cylinder, 2...Heat absorption part, 3...Combustion chamber,
4... Burner group, 5... Outer shell, 6... Air supply path, 7
...Blower, 8...Primary air chamber, 9...Discharge port,
10...Communication path.

Claims (1)

[Scope of utility model registration request] A heating cylinder having a heat absorbing part in the upper part and a burner group in the lower part and a combustion chamber inside, and the heating cylinder and the burner group being enclosed in a sealed manner to form an air supply path between the heating cylinder and the heating cylinder. A primary air-dependent combustion A forced air-cooled instantaneous water heater characterized in that a combustor that relies on secondary air is connected to a primary air chamber, and a combustor that relies on secondary air is connected to a heating cylinder.