JPH0125875Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application) The present invention is a device for supplying primary air to combustion appliances such as gas burners, and relates to a device that forcibly feeds primary air using an electric fan or the like. .

(Summary of the present invention) The present invention is designed to improve the structure of the forced primary air burner near the nozzle so that the air supplied by the electric fan does not have an adverse effect on the gas ejected from the nozzle. In order to reduce the size of the nozzle, the air blown from the side of the nozzle is rectified by a wind shield plate in the direction of the ejected gas, and this air shielding effect affects the amount of ejected gas. Moreover, the gas and air are mixed in a good state without causing any damage.

(Prior art and its problems) A combustion device using ceramic plates was developed as a type of forced primary air type gas burner.
It was proposed as No. 176097, but this conventional one is
As shown in FIG. 4, an electric fan 3 has a nozzle 2 facing the primary air port 11 of the burner 1, and a discharge port 31 opening in the same direction as the nozzle.
is placed on the front side of the vessel A, and a mixture of air from the electric fan 3 and gas from the nozzle is ejected from the flame holes 13, 13 of the ceramic plate 12 provided in the burner head, and these The heat is burned in a combustion chamber surrounded by the heat transmitting plate 14 and the ceramic plate 12, and part of it reaches the object B as radiant heat, and part of it reaches the object B as exhaust heat discharged from the through holes 15, 15.

In this burner, since both radiant heat and exhaust heat are applied to the heated object, thermal efficiency is improved compared to known surface combustion type burners.

On the other hand, from the perspective of combustion performance, this type of burner has a high excess air ratio, so sufficient mixing of air and gas must be ensured to ensure combustion stability. Therefore, in this conventional device, the discharge port 31
and nozzle 2 are set in the same direction.

However, this conventional device has the disadvantage that the front and back dimensions of the device are large.

Normally, when trying to effectively utilize the air blowing capacity of an electric fan, its outlet is somewhat large, and if it is opened in the same direction as the nozzle, the outlet 31 of the electric fan 3 must be attached to the nozzle mounting part as is. This is because, in this case, the size of the main body of the electric fan that protrudes forward from the end of the discharge port becomes significantly larger than the amount of protrusion of the piping to the nozzle.

In order to eliminate the above-mentioned inconveniences, as disclosed in Japanese Utility Model Application Publication No. 57-199750 and Japanese Utility Model Application Publication No. 58-122820, a vacant chamber is provided next to the primary air port of the burner. It is conceivable to utilize a configuration in which an air supply circuit from an electric fan is communicated with the side wall.

In the case of this improvement plan, if the outlet of the electric fan is connected to the opening in the side wall of the empty chamber, the electric fan will be oriented horizontally to the axis of the burner. The dimensions can be made smaller.

However, in the case of an improvement plan that simply repurposes the conventional technology, it is not possible to set a large amount of primary air suction, and there is a problem of poor combustion when used in an all-primary air type burner. .

This is because, in the case of the above improvement plan, if the amount of air supplied from the air discharge port of the empty chamber is increased, the supplied air directly reaches the gas ejection area from the nozzle and adversely affects the gas flow. This is because the pressure of the ejected gas acts directly on the gas ejecting portion of the nozzle.

That is, the air pressure acts to suppress the gas ejected from the nozzle, and the flow of air and gas in the mixing tube of the burner becomes uneven, resulting in insufficient mixing.

(Technical Problem) The present invention consists of: A cavity 4 is provided in series on the upstream side of the primary air port of the burner so as to surround the primary air port,
A nozzle 2 is disposed facing the wall surface of the cavity 4 facing the primary air port, and a discharge port 31 for discharging air from the electric fan 3 is opened in the side wall of the cavity 4. The direction of air discharge from the nozzle 2 is perpendicular to the direction of gas discharge from the nozzle 2, and the air discharge port of the electric fan is communicated with the discharge port 31,
In a primary air supply device for a combustion appliance that supplies a large amount of air from an electric fan to the primary air port of a burner, the Even if primary air is supplied from the discharge port 31, in order to prevent the air blown from the electric fan from having an adverse effect on the gas ejection from the nozzle.
The technical problem is to prevent the blown air from directly reaching the gas ejection area from the nozzle 2.

(Means) The technical means of the present invention taken to solve the above technical problem is as follows: A discharge port 31 is disposed on the side near the nozzle 2, and the nozzle 2 is provided in the air discharge path from the discharge port 31. A wind shielding plate 5 for blocking the gas ejection area from the tip of the chamber to the primary air opening is protruded from the primary air opening wall surface of the cavity 4, and this wind shielding plate 5 is provided between the primary air opening and the discharge port 31. , a sufficient gap is provided between the outer peripheral area of the wind shield plate 5 and the inner wall of the cavity 4.

(Operation) The above technical means of the present invention operates as follows.

A discharge port 3 that serves as an air discharge section from the electric fan 3
1 opens on the side wall of the cavity 4 connected to the primary air port of the burner, so the electric fan 3 is located on the side of the cavity 4, and the main body of the electric fan 3 is connected to the cavity 4. It does not protrude very much in front of the.
In other words, even if the electric fan 3 is provided, the size of the device on this side from the primary air port can be minimized.

Next, looking at the actual primary air supply by air blowing from the electric fan 3, when gas is supplied from the nozzle 2 and the burner is in the combustion state, the discharge port 3
The discharge air from 1 is supplied as primary air, but since there is a wind shield 5 in the gas ejection area, the discharge air enters the empty chamber 4 and then passes through the wind shield 5.
The gas is dispersed to a part other than the area where the gas is ejected from the nozzle 2, and is further inside the cavity 4 from the gap part of the outer periphery of the wind shield plate 5 (the base end side of the nozzle 2 and the outside of the body of the nozzle 2). The gas is then fed to the primary air port along the direction in which the gas is ejected from the nozzle 2.

In this primary air supply state, the wind shield plate 5 facing the discharge port 31 has a certain gap with the discharge port 31, and since there is a sufficient gap around the outer periphery of the wind shield plate 5, the discharge port Even when the amount of air discharged from the nozzle 31 is large, it is smoothly sent into the primary air port without adversely affecting the gas ejected from the nozzle 2.

In particular, among the discharged air that collides with the wind shield plate 5, the air that flows toward the base end of the nozzle 2 after colliding with the front wall (the wall facing the primary air port) of the cavity 4, which is the nozzle attachment part. , as the reflected wind,
Flows to the primary air port side.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

The air from the electric fan discharged from the discharge port 31 into the empty space 4 is passed through the nozzle 2 by the wind shield plate 5.
Because you will be guided to a part other than the gas ejection area from
Unlike in the case of the improvement plan mentioned above, the ejected gas from the nozzle 2 and the primary air are not supplied into the burner in an unbalanced state, and even when a large amount of primary air is supplied, it is stable. Combustion can be ensured.

In addition, since the pressure of the discharged air from the discharge port 31 does not directly act on the nozzle 2, the air that flows toward the base end of the nozzle 2 out of the discharged air that collides with the wind shield plate 5 is absorbed by this nozzle. After colliding with the front wall of the empty chamber 4 (the wall facing the primary air port), which is the mounting part, the reflected wind flows toward the primary air port, so when a large amount of primary air is supplied, the nozzle The inconvenience that the gas ejected from 2 is suppressed by the air pressure does not occur.

In addition, compared to the device provided with an auxiliary bench lily pipe as disclosed in Utility Model Application Publication No. 57-190229,
The size of the chamber that is connected to the upstream side of the primary air port and communicates with the discharge port of the electric fan in the longitudinal direction (in the direction of the nozzle axis) is reduced, so that the overall size can be reduced.

(Example) In this example, as shown in Fig. 1, a two-burner gas stove equipped with two burners 1, 1 is used.
An electric fan 3 is attached to each burner.

Since the burner and the electric fan have the same structure, one will be explained here as an example. The empty chamber 4 connected to the primary air port 11 of the mixing tube 16 is formed by a rectangular box, and the wall surface facing the primary air port 11 is the front wall 41, and the nozzle 2 is installed in the center of this. is provided to protrude toward the primary air port 11. Note that the primary air port 11 fits into an opening 42 provided on the opposite wall of the front wall 41.

The mounting structure of the nozzle 2 is as shown in FIG.
This nozzle is inserted into a hollow female screw 21 attached to the nozzle 1, and a cap nut 22, which is fitted around the piping 6 to prevent it from coming off, is tightened to the female screw. Since the cap nut 22 is fitted and abutted against the cap nut 22, it is airtightly connected to the piping and fixed at the proper position at the same time. Therefore, when the cap nut 22 is loosened, the nozzle 2
becomes removable.

Next, the electric fan 3 employs a small centrifugal blower fan, and the discharge port 31 is located eccentrically from the suction port 32.
and are perpendicular to each other, and this discharge port is connected to an opening 43 formed in the side wall of the cavity 4.

Furthermore, the width of the wind shield plate 5 is set to be slightly larger than the diameter of the nozzle 2, and has a certain gap with the opening 43, and furthermore, its tip has a certain gap with the front wall 41 of the cavity 4. is formed to have
One side of the wind shield plate 5 is attached only to the wall surface on the side of the mouth portion 42. Therefore, the wind from the discharge port 31 enters the cavity 4 through the outer peripheral gap of the wind shield plate 5, and flows into the mixing pipe 16.
will be reached.

In addition, in this embodiment, since the tip of the wind shield plate 5 is bent obliquely toward the base of the nozzle 2, the amount of air in this direction increases as a proportion, and the air flow from the front wall of the cavity 4 increases. The reflected wind flows in the direction of the mixing pipe. Therefore, the codirectionality of the ejected gas and air flow is further improved.

[Brief explanation of the drawing]

Fig. 1 is a cutaway plan view of a stove according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of the main part, and Figure 3 is its X-X
The sectional view and FIG. 4 are explanatory diagrams of a conventional example, and in the figure 1... burner, 16... mixing tube, 2... nozzle, 3... electric fan, 31... discharge port, 4...
Vacant room, 41...Front wall, 5...Wind shield.

Claims (1)

[Scope of utility model registration request] A cavity 4 is provided on the upstream side of the primary air port of the burner so as to surround the primary air port, and a nozzle 2 is disposed facing the wall surface of the cavity 4 facing the primary air port. A discharge port 31 for discharging air from the electric fan 3 is opened in the side wall of the chamber 4, and the direction of air discharge from the discharge port 31 is perpendicular to the direction of gas jet from the nozzle 2. In a primary air supply device for a combustion appliance, the outlet is communicated with the discharge port 31 to supply a large amount of air blown from an electric fan to the primary air port of the burner. A wind shield plate 5 is provided to block the gas ejection area from the tip of the nozzle 2 to the primary air port in the air discharge path from the discharge port 31, and protrudes from the wall surface of the primary air port opening of the cavity 4. A primary air supply device for a combustion appliance, in which a wind shield plate 5 is provided between a primary air port and a discharge port 31, and a sufficient gap is provided between the outer peripheral area of the wind shield plate 5 and the inner wall of the cavity 4.