JPS5866730A - Gas range - Google Patents

Abstract

PURPOSE:To improve combustion characteristic, CO/CO2 value and thermal efficiency, by selecting respective distances between the upper surface of a burner having a plurality of flame holes and secondary air hole and the upper surface of a tripod, and between the upper surface of the burner and the upper surface of a rib of the tripod and a diameter of the secondary air hole at fixed values. CONSTITUTION:A diameter phiD of a central secondary air hole 18 of a burner 3 is made into 22mm. or larger than that. Then, a distance A between the upper surface 15 of the burner 3 and the upper surface of a claw 23 of a tripod 4 is set so that it ranges between 18mm. and 27mm. and a distance B between the upper surface 15 of the burner 3 and the upper surface 21 of a rib of the tripod 4 is set at 5.5mm. or larger than that respectively. With this constitution, thermal efficiency and secondary air supply quantity can be set at the most suitable state respectively. Then, combustion characteristics, CO/CO2 value and thermal efficiency can be improved.

Description

[Detailed description of the invention] The present invention relates to a gas stove.

FIG. 4 shows a partial configuration diagram of a conventional gas stove, and will be described in detail below.

50 is a gas stove and is composed of the following. 61
is a burner, 62 is a burner body, 53 is a burner cap, 64 is a mixture chamber constituted by the burner body 52 and the burner cap, 56 is a flame hole, 56 is a main flame, 5
7 is an inner flame hole, 58 is an inner flame, 59 is a central secondary air hole provided in the center of bar 'f51, 60 (td, trivet, 61 is a rib of trivet 6o, 62 is a secondary air hole on the outer periphery of the burner) The gas stove ω is configured by: 63 is a heated part (hereinafter referred to as steel) installed on the trivet 6o, 64 is secondary air in the center of the burner, 66 is secondary air hole air, 66 is surrounding secondary air, 67 is an exhaust passage.

To explain the state when using the gas stove 5o for the purpose of heating the pot 63, a premixture of gas and air is supplied to the burner 51, flows through the mixture chamber 54, and is heated through the flame hole 56 and the inner flame hole 67. The main flame 56 and the inner flame 58 are formed and combustion starts, and at the same time heating of the pot 68 starts.

At this time, in order to form the main flame 66 and the inner flame 68 and maintain combustion, secondary air for combustion must be supplied, and the secondary air is supplied from the central secondary air hole 59 in the bar. Central secondary air 64 and secondary air holes 62 on the outer periphery of the burner
The secondary air hole air 65 to the outer periphery of the burner is supplied from the periphery of the burner, and the surrounding secondary air 66 is supplied from the periphery of the trivet 6o. In order to supply these three types of secondary air, two air holes must be provided around the burner center secondary air hole 69 and the secondary air holes 62, 5, and 6o on the outer periphery of the burner, which are the respective secondary air supply paths. Next, air flow must occur.

What causes this flow is the draft force determined by the density difference between the combustion gas and the secondary cavity and the flow bed of the combustion gas, and what tries to stop this flow is the flow path resistance. In relation to n゛ and ii, the secondary empty encompassment is determined.

The amount of secondary air supplied as described above is determined by the sizes of the burner central secondary air hole 59, the burner outer peripheral secondary air hole 62, the exhaust passage 67, the structural positional relationship between the trivet 60 and the burner 51, and the burner 51. and pan 63 (1ti!), which are related to each other, and are optimal when trying to obtain the largest amount of secondary air, improve the CO/Co2 characteristics in the combustion exhaust gas, and improve the combustion characteristics. There are dimensions.

Conventionally, the degree of influence of these factors was not understood and was determined empirically, so some dimensions may be set to the optimum dimensions, but overall optimum dimensions have not been set. For example, in order to improve the combustion characteristics, the opening of the burner 51 and the pot 63 is made wider, so that the main flame 56 and the inner flame 58 touch the pot 63, etc., and the distance between the flame 56 and the inner flame 58 becomes narrower. The temperature of the combustion gas that heats the pot 63 must be lowered accordingly, resulting in a disadvantage that the thermal efficiency is as low as around 45%.

The present invention comprehensively found the optimum configuration conditions for forming stable combustion with the highest thermal efficiency, with the degree of influencing factors clearly 1-1 - that is, with multiple flame holes and secondary air holes. By setting the configuration of the burner and trivet within the optimum values of burner, trivet, top surface distance A, burner, trivet rib top surface distance B, and burner secondary air supply, combustion characteristics CO/CO2 can be improved and The purpose is to improve the amount of heat transferred to the heating suppressor (hereinafter referred to as thermal efficiency).

Examples are shown in FIGS. 1 to 3 and will be described in detail.

1 is a gas stove, 2 is an ignition knob, 3 is a burner, 4 is a trivet, 5 is a pot, 6 is a nozzle, 7 is a mixing pipe 8 is a burner body, 9 is a burner cap, 10 is a burner body f~8 and a bar , 9)), 11
12 is the main flame formed in the flame hole 1, 13 is the inner flame formed in the inner flame hole 13, 15 is the burner top surface of the burner cap 9, 16 is the saucer, 17 is the top plate, 18 is the flame hole.ノ(-su3
secondary air hole in the center of
) upper surface of the rib, 22 is the claw of the trivet 4, 23 is the upper surface of the claw of the claw 22, 24 is the surrounding secondary air supplied from around the trivet 4, 25 is the secondary air hole air supplied from the secondary air hole 19 , 26 is the central secondary air 27 supplied from the central secondary air hole 1B, and 28 is the exhaust gas flow exhausted from the exhaust passage 27.

When the ignition knob 2 is operated, the gas from the nozzle 6 is mixed with air in the mixing tube T to produce a premixed mixture, and then,
The mixture flows through the mixture chamber 10, is ejected from the flame hole 11 and the inner flame hole 13, and is ignited by an igniter (not shown) linked to the ignition knob 2, forming a main flame 12 and an inner flame 14, respectively, and combusts. At the same time, the pot 6 placed on the top surface of the trivet 4 is heated to achieve the purpose.

In this combustion, in order to maintain and continue combustion, secondary air necessary for combustion must be supplied to the main flame 12 and the inner flame 14, respectively, and this secondary air supply state is different from that in the conventional example. In order to improve combustion characteristics, it is important to supply a large amount of secondary air and reduce the amount of carbon monoxide contained in the combustion exhaust gas. It must be a gas stove with a configuration that can supply secondary air. The details and combustion characteristics will be explained below.

The part that supplies secondary air is the burner center secondary air hole 1.
8. Size of secondary air hole 19, exhaust passage 27 and trivet 4
It depends on the configuration and positional relationship of the burner 3. The most important configuration for supplying a large amount of secondary air is the optimal design of the part that supplies secondary air as described above, including the burner center secondary air hole 18, secondary air hole 19, and burner top surface 15. These are the distance B to the rib top surface 21 and the distance A between the burner top surface 16 and the claw top surface 23. At this time, the distance between pot 5 and burner 3 (
If the distance (same as distance A) is made smaller, the thermal efficiency will be larger as the pot 5 gets closer to the main flame 12 and the inner flame 14, but on the other hand, the main flame 1
As the main flame 12 and the inner flame 14 come closer to the pot 6, the pot 6 cools the flame during the reaction, so the main flame 12 and the inner flame 14 receive a cooling effect, which deteriorates the combustion characteristics. Therefore, the distance A can be set sufficiently wide to lower the thermal efficiency, or the present invention can supply more secondary air to shorten the combustion reaction time and improve the thermal efficiency. It improves combustion characteristics and thermal efficiency.

Figure 6 shows the relationship between the diameter of the burner central secondary air hole 18 and the combustion characteristic Co/C○2, and if the diameter of the burner central secondary air hole 18 is made smaller, the CO/C CO2 levels suddenly become sharper. At that time, the diameter of the central secondary air hole 18 is 22 mm, and it is not possible to set it higher than this.
- It can be seen that this is the optimum size for the diameter of the secondary hollow hole 18 in the center of the knife. The reason why this optimum dimension exists is that when secondary air is supplied by draft force, it is determined by the balance between the draft force and the flow path resistance of the burner central secondary air hole 18. This is because the amount of secondary air space decreases.

FIG. 6 shows the relationship between the distance B between the burner top surface 15 and the rib top surface 21 and the combustion characteristics, and the parameter in the figure is the distance A between the burner top surface 16 and the claw top surface 23. It can be seen that when the distance B is changed, the combustion characteristics do not change even if the parameter A is changed beyond a certain point, and there is a bending point that does not change even if the distance B is varied. At this bending point, the distance B was 6.5 degrees or more. This is distance B
By changing the distance B, the combustion chamber surrounded by the trivet 4, burner 3, saucer 16, and pot 5, where the main flame 12 and inner flame 14 exist, exerts a chimney effect, and as the distance B increases, a larger draft force is generated. This is to increase the amount of secondary air supplied from the burner central secondary air hole 18 and the secondary air hole 19.

In addition, as the draft force increases, the secondary air flow 24 supplied from around the trivet 4 also becomes negative pressure in the combustion chamber, so conventionally, it is not supplied at the combustion part C to improve combustion characteristics. The combustion exhaust gas that had been bypassed is now supplied to the combustion section, improving the combustion characteristics.

The bending point C in the figure is between the rib upper surface 21 and the pan 5 ((Thus, the determined defecation passage 27 is small, so if the distance A is kept constant and the surface 21 is changed to the rib, the exhaust passage 27 will be made smaller and the combustion The flow path area of the exhaust gas is small and the draft force is constant, so it cannot be exhausted, and the exhaust gas is trapped inside the combustion chamber, which reduces the draft force.
This exists because combustion characteristics deteriorate rapidly because secondary air is no longer supplied from various parts.

Figure 7 shows the angle α of the flame hole 11, the main flame 12 and the inner flame 1 in the pot 5.
4 shows the relationship between the adhesion limit of soot and the distance A between the burner top surface 15 and the claw top surface 23 required for constant thermal efficiency. From the figure, when the flame hole angle α is changed, the distance A at which soot does not adhere to the pot 5 must be 18 or more and 27 or less. In other words, the best efficiency can be obtained by setting A as close as possible to the soot limit line according to the flame hole angle, but the distance is at least 18W! Must be L or above.

If you want to obtain a thermal efficiency of 50%, which is about 10% less than the 45% thermal efficiency of a conventional gas stove, you need to maintain the distance according to the constant thermal efficiency curve in Figure 7, A, which can be used as a gas stove. It corresponds to the flame hole angle, but it must be 188 or more, and if the setting is made as close to the soot limit curve as possible, it can be seen that the thermal efficiency of conventional gas stoves, which was around 45%, can be increased to 50% or more.

The distance B between the burner top surface 15 and the rib top surface, which is the optimum configuration dimension explained above, is 5.58 or more, the burner center secondary air hole is 22 degrees or more, and the distance A between the burner top surface 15 and the ↓ claw top surface is 18≦A≦ By setting the distance A to 27, it was possible to improve the phenomenon in which combustion characteristics deteriorate due to the distance A being made too small even though the thermal efficiency was desired to be improved.

Therefore, the present invention aims to improve thermal efficiency 1- by shortening the distance between the pot and the burner to heat the pot with higher-temperature combustion gas and bringing the pot closer to the burner in order to solve the problem of low thermal efficiency, which was a drawback of the conventional method. However, due to the contradictory phenomenon of poor combustion characteristics, gas stoves were constructed with low thermal efficiency.However, by configuring gas stoves with the optimal structural dimensions explained in the example, burner This has the effect of improving thermal efficiency because the combustion zone +'1 does not deteriorate even if the distance between the two steel parts is made closer.

[Brief explanation of the drawing]

Fig. 1 is the structural dimensions of a gas stove, Fig. 2 is a sectional view of a gas stove according to an embodiment of the present invention, Fig. 3 is an enlarged sectional view of the same part, and Fig. 4 is a partial enlarged view of a conventional combustion section. , 51st Z
1 to 7 are characteristic diagrams showing the relationship between changes in gas stove structural dimensions, combustion characteristics, and thermal efficiency. 1m@@a@@Gaf stove, 31111111161+
Burna, 40. =... trivet, 11... flame hole,
18...Secondary air hole, 21...Top surface of trivet rib, 23...Top surface of trivet (claw). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Fig. 4 Fig. 5 IO The role of the two major air holes at Chuo University [-] Fig. 6 B

Claims (1)

[Claims] A burner having a plurality of flame holes and secondary air holes, and a trivet, and a path from the top surface of the burner to the top surface of the trivet ≦ hollow L;
&Cas stove.