JPH0318827Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a gas combustion device mainly applied to gas instantaneous water heaters and other gas water heaters.

(Prior art) Conventionally, as this type of device, for example,
As seen in No. 186613, a cooling member is provided on the upper side of a gas burner that burns a gas premixed with air in an amount greater than the theoretical amount, and is placed near the tip of the flame generated in the burner to direct the hot air of the flame. The temperature is lowered to an appropriate temperature range, for example, around 1200°C by the member, and a heat exchanger is provided above the heat exchanger via an oxidizing adiabatic space to guide the hot air to the upper side and oxidize it. A system has been proposed that allows hot water to be obtained while suppressing the generation of CO.

(Problem to be solved by the invention) However, in such a device, depending on the shape of the cooling member and other factors, the temperature distribution of the hot air guided through the space may not necessarily be uniform over the entire surface. In other words, the hot air has a relatively high temperature in a part of the space and a relatively low temperature in another part, making it difficult to obtain a good effect as a whole.

(Means for Solving the Problems) The present invention provides an apparatus that does not have such disadvantages, that is, an apparatus in which the streams of hot air are mixed with each other in the space and the temperature thereof is made as uniform as possible as a whole. A plurality of parallel cooling members are placed on the upper side of a gas burner that burns a gas premixed with air in an amount greater than the theoretical amount, and are placed near the tip of the flame generated in the burner. and a heat insulating space for oxidation that guides the hot air of the flame whose temperature has been lowered by the cooling member to the upper side of the space, and a heat exchanger above the heat exchanger. A plurality of baffle pieces are arranged above between the cooling members and extending in the same direction as the cooling members.

(Example) An example of implementing the present invention will be explained with reference to attached drawings.

The drawing shows the case where it is applied to a gas instantaneous water heater. In the drawing, 1 indicates a gas burner, and the burner 1
is configured to burn city gas or other gas premixed with air in an amount greater than the theoretical amount of air, and a cooling member 3 is placed in the upper inner shell 2 facing near the tip of the flame generated in the burner 1. For example, the temperature of the flame, that is, the temperature of the hot combustion air generated in the flame, is determined by
The temperature is lowered to a range of 1000 to 1500°C, preferably around 1200°C, and the hot air is then guided above it to oxidize it via a heat exchanger 5 through an oxidizing heat insulating space 4. , so that the heat exchanger 5 was actuated with the hot air to obtain hot water. In the illustrated case, the heat exchanger 5 is of a type including a plurality of water pipes 5a and a plurality of fins 5b on the outer periphery, and the cooling member 3 is an auxiliary heat exchanger connected to the downstream side of the heat exchanger 5. In other words, the cooling member 3 is composed of a plurality of water pipes 3a, and a large number of fins 3b are provided around the outer periphery of the water pipes 3a.

The above is not particularly different from what was proposed earlier, but
In such a device, the hot air guided into the space 4 is obtained at a relatively low temperature at the upper position of each water pipe 3a constituting the cooling member 3, and the temperature of each pair of water pipes 3a,
In the upper position of the spacing 3a, a relatively high temperature is obtained, resulting in an overall non-uniform temperature distribution, which tends to make the intended oxidation action in the space 4 inefficient.

The present invention eliminates such inconvenience by disposing a plurality of baffle pieces 6 in the space 4 above the water pipes 3a constituting the cooling member 3 and extending in the same direction as the water pipes 3a. To explain this in detail, in the illustrated example, the baffle pieces 6 are composed of ceramic rods having a substantially rectangular cross section, which are arranged in parallel in parallel and mutually connected by reinforcing horizontal members 7. They are connected to form a lattice-like structure as a whole, and each baffle piece 6 is located directly above the interval between each pair of water pipes 3a, 3a, as shown in FIG. The cross-sectional shape is approximately rectangular as described above, but in this case, the direction is to form each mountain shape downward and upward, and the upward direction The chevron surface is covered with this to prevent drainage.
A cover made of SUS or other metal plate is now applied.

(Function) To explain the function, according to the combustion of the burner 1, the hot air guided upward from the generated flame first acts on the cooling member 3, thereby reducing the temperature, and then It is oxidized through the space 4 and then guided to the heat exchanger 5 above it to heat it.This point is not particularly different from conventional ones, and during such operation, the heat exchanger 5 is heated. The hot air is in the space 4
Each baffle piece 6 that exists within the space 4 while being guided therein.
The hot air flows as a whole tend to mix together and mutually compensate for their temperature differences. To summarize, the hot air flows are mixed with each other to reduce the temperature difference between them, and the temperature as a whole becomes approximately a predetermined value and is approximately uniformly distributed.

(Effects) According to the present invention, a plurality of baffle pieces extending in the same direction as the cooling members above the space between the cooling members are disposed in the heat insulating space for oxidation,
Each baffle piece can act on the flow of hot air in each part to give disturbances such as splitting or detouring, and as a whole, the flow of hot air in each part is mixed with each other and reaches approximately a predetermined temperature. At the same time, the temperature distribution can be made as uniform as possible, and better oxidation can be obtained in the hot air than when the temperature distribution is uneven in each part. It is simple and can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of one example of the device of the present invention, FIG. 2 is a perspective view of the main part thereof, and FIG. 3 is a sectional view of a part thereof. 1...Gas burner 3...Cooling member 4...Insulating space 6...Baffle piece.

Claims (1)

[Scope of utility model registration request] A plurality of parallel cooling members are provided above the gas burner that burns a gas premixed with air in an amount greater than the theoretical amount, facing near the tip of the flame generated in the burner. In a device that is equipped with an oxidizing heat insulating space that guides the hot air of the descending flame to the upper side thereof, and is equipped with a heat exchanger above the heat exchanger, in the space, there is a space between the cooling members and the same as the cooling member. A combustion device consisting of a plurality of baffle pieces extending in the direction.