JPH0523932Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to improving the thermal power balance in a gas burner in which a mixing tube is connected at an eccentric position.

<Prior art and its problems> In gas burners that have a passage for secondary air in the center or a heat-sensitive part for detecting the temperature of the pot, the burner head is annular and the mixing tube is connected to the gas burner. Since it cannot be connected to the center of the burner head, the structure is such that it is connected at a position eccentric from the center of the burner head. Therefore, if you do not pay attention to the fact that the air-fuel mixture is distributed evenly to all the flame ports, the mixture will tend to come out from the flame ports that are close to the connection with the mixing pipe, and it will be difficult to come out from the flame ports that are far away, resulting in a weak flame. This creates an imbalance of firepower between the mouths.

For this reason, in the past, attempts have generally been made to eliminate the unbalance by changing the connection angle of the mixing tube to tilt the inflow direction of the air-fuel mixture, or by devising the shape of the mixing tube. However, due to structural constraints of the gas appliance in which the burner is installed, it may not be possible to arbitrarily select the shape and connection angle of the mixing pipe. was becoming difficult.

For example, according to Japanese Utility Model Publication No. 55-4642, a groove with a small cross-sectional area is formed between the connecting part of the mixing pipe and the inside of the burner head near this connecting part, and a bypass path is formed from the connecting part to the side surface of the burner head. It is proposed to form a This improves the flow of the air-fuel mixture by controlling the direction of dynamic pressure using the nozzle action of the groove.
Since the air-fuel mixture can be distributed evenly to each burner port only when combined with a specific burner top, it is not possible to change the input amount by combining burner tops with different burner port sizes. There are also problems such as the structure is complex and difficult to manufacture.

This invention was developed in view of these problems and with the aim of providing a gas burner whose thermal power balance can be easily improved.

<Means for solving the problem> In order to achieve the above-mentioned purpose, in this invention,
In a gas burner in which an annular burner head consisting of a burner base and a burner top placed on the burner head is connected to a mixing tube at an eccentric position, a flow rate regulating plate that has a limiting effect on the dynamic pressure of the mixture is used as a flame. It is located inside the mouth and protrudes downward from the ceiling of the burner top, and the shape of this flow rate adjustment plate is such that the amount of protrusion is large in the part near the connection with the mixing pipe, and the amount of protrusion is small in the part far from the connection. It has a hanging wall shape.

<Function> The flow rate adjustment plate is located just inside the flame port, and the dynamic pressure is restricted near the flame port and becomes static pressure. The amount of protrusion of the flow rate adjustment plate is large in the area where the dynamic pressure is high near the connection with the mixing pipe, and small in the area far away, so the total pressure for each flame port, that is, the sum of the dynamic pressure and the static pressure, is almost equalized. This makes it easy to evenly distribute the air-fuel mixture to all the burners and improve the balance of firepower between the burners.

<Example> Next, an example of a burner equipped with a heat sensitive part will be described.

In Fig. 1, 1 is a burner head consisting of a burner top 2 and a burner base 3, 4 is a mixing tube connected to the burner base 3, 5 is a heat sensitive section, 6 is a lead wire of the heat sensitive section 5, and 7 is a heat sensitive section. 5 is a support rod, and 8 is a heat sensitive part cover.

The burner top 2 and the burner base 3 are annular with a hole 9 penetrating vertically in the center, and the support rod 7 is arranged so as to pass through the hole 9 with its lower end fixed to the main body (not shown) as appropriate. The heat-sensitive section 5 is attached to the tip of the support rod 7 so as to be movable within a certain range in the vertical direction, as shown by the chain line, and urged upward by a spring. Reference numeral 10 denotes flame ports, and although not shown, a plurality of flame ports are formed on the circumferential surface of the burner top 2 at predetermined intervals. The heat sensitive part cover 8 has a cylindrical shape with a large diameter part 8b at its upper edge via a tapered part 8a, and a plurality of ventilation holes 8c are formed at regular intervals in the tapered part 8a.
This heat sensitive part cover 8 is integrally fixed to the upper center surface of the burner top 2 by suitable means using, for example, a C ring.

As mentioned above, the burner of this embodiment has a heat sensitive part 5.
Since the mixing tube 4 is annular with 12 are provided. The flow rate regulating plate 12 is a hanging wall-like member that protrudes downward from the ceiling, and the amount of protrusion changes continuously, being largest at the part closest to the connection part 11 and farthest from the connection part 11. The amount of protrusion is the smallest in that part. Reference numeral 13 indicates a non-circular portion provided for combining the burner top 2 and burner base 3 at a predetermined angle.

Next, the operation will be explained. When in use, the heat sensitive part 5 comes into contact with the bottom of the pot (not shown) and is pressed down as shown by the solid line, and the temperature of the bottom of the pot is detected by a built-in thermocouple, thermistor, etc., and the result is used for control. Most of the radiant heat from the flame emitted from the flame port 10 is blocked by the heat-sensitive part cover 8 and does not reach the heat-sensitive part 5, and since the heat-sensitive part 5 is cooled by the rising air passing through the hole 9, the temperature at the bottom of the pot is Accurately detected. Multiple ventilation holes 8c in the heat sensitive part cover 8
is formed, so even if the top surface of the heat-sensitive part cover 8 is blocked by the bottom of the pot, the hole 9
The airflow that passes through can flow through the ventilation hole 8c without any hindrance, and the heat-sensitive section 5 will not be insufficiently cooled. Further, since the ventilation hole 8c is provided in the tapered portion 8a and is in an inclined state, the ventilation hole 8c
The effective opening area for radiant heat from the flame can be made small without reducing the total area of c itself, and the influence of radiant heat due to the provision of the ventilation holes 8c can be reduced.

The mixture to the burner head 1 is supplied from the mixing tube 4 as shown by the arrow, and is emitted from each flame port 10 to be burned. Because the protrusion is large, the dynamic pressure of the mixture is limited and it becomes difficult for the mixture to flow into the flame port 10.The flame port 10, which is located away from the connection part 11 and where the dynamic pressure of the mixture is low, is connected to the flow rate adjusting plate 12.
Since the amount of protrusion is small, there are fewer restrictions on dynamic pressure, making it easier for the air-fuel mixture to flow in. Therefore, by appropriately selecting the amount of protrusion of the flow rate adjusting plate 12 in advance through experiments or the like, all the flame ports 10 can be
This makes it possible to make the total pressure (=dynamic pressure + static pressure) approximately equal, and it becomes possible to evenly distribute the air-fuel mixture and perform combustion in a state where the heating power of each flame port is balanced.

In addition, since the flow rate adjustment plate 12 is provided in the shape of a hanging wall to protrude downward, even if the boiling liquid enters from the flame opening 10, the boiling liquid will flow through the recess 3a of the burner base 3.
This allows the flow rate adjustment plate 12 to also serve as a drainer.

The amount of protrusion of the flow rate adjusting plate 12 does not have to be changed continuously as described above, but can also be changed stepwise as in the embodiment shown in FIG. That is, in this embodiment, the portion closest to the connecting portion 11 is the portion 12a with the largest protrusion amount, and the portion 12b, 12
c, 12d, and the amount of protrusion is made smaller as the distance from the connecting portion 11 increases, and the amount of protrusion is 0 at the farthest portion, so that substantially no flow rate adjusting plate 12 is formed.

In each of the embodiments, the flow rate adjustment plate 12 is formed concentrically with respect to the outer peripheral shape of the burner base 1, but the flow rate adjustment plate 12 does not necessarily have to be concentric, and may be eccentric or non-centered as appropriate. It can also be made circular.

<Effects of the invention> As is clear from the above-mentioned embodiments, this invention has a part near the connection with the mixing pipe inside the flame opening of the annular burner head that connects the mixing pipe at an eccentric position. A hanging wall-like flow rate regulating plate is formed which has a large protrusion at the end and a small protrusion at a portion far from the connection, and this flow rate regulating plate limits the dynamic pressure of the air-fuel mixture.

Therefore, even in burners that tend to have imbalances in the distribution of air-fuel mixture to each burner port because the mixing tubes are connected at eccentric positions, it is possible to distribute the air-fuel mixture evenly to all the burner ports. becomes easier,
This makes it possible to improve the firepower balance.

In addition, since it is only necessary to form the flow rate adjustment plate in the shape of a hanging wall on the burner top, the structure of the burner top and burner base that make up the burner head is simplified, making it easier to manufacture.Furthermore, the burner base can be shared and the burner top can be replaced. It is possible to take measures such as changing the input amount depending on the conditions, and there is also the advantage that it is easy to obtain burners with different ratings.

[Brief explanation of drawings]

Figure 1 is a side sectional view of one embodiment of this invention;
Figures a and b are a bottom view and a sectional side view of a burner top of another embodiment. 1... Burner head, 2... Burner top, 3
... Burner base, 4 ... Mixing pipe, 10 ... Burner port, 11 ... Connection section, 12 ... Flow rate adjustment plate.

Claims (1)

[Scope of utility model registration request] A gas burner comprising an annular burner head consisting of a burner top having a plurality of flame ports on the periphery and a burner base on which the burner top is placed, and in which the connection between the burner head and the mixing pipe is located at an eccentric position, A flow regulating plate having a limiting effect on the dynamic pressure of the mixture is located inside the burner port and protrudes downward from the ceiling of the burner top, and the protruding amount of the flow regulating plate is located at the connection between the burner head and the mixing pipe. A gas burner that is shaped like a hanging wall, with a large part near the connection part and a small part far from the connection part.