JPS60162120A - Method of regulating during change in kind of gas for gas device - Google Patents

Abstract

PURPOSE:To perform regulation during change in a kind of gas without replacement of a gas nozzle, by a method wherein a nozzle pressure is set through replacement or regulation of a gas pressure regulating member, mounted to a gas passage, so that the same flow rate of gas calculated in terms of calorie is injected through a gas nozzle. CONSTITUTION:In a gas device being a type in which a primary air for combustion is forcibly fed to a burner for a hot air type gas heater, when a kind of gas is varied, the same flow rate calculated in terms of calorie is provided by means of a regulating screw 9a of a governor 9 through regultion of a set pressure. However, if a set pressure is set to a low pressure of about 10mm. H2O when high calorie gas is varied, even if a slight error of about 1mm. occurs to the set value, an error ratio inrelative to a base value is incresed, and thereby a gas flow rate is sometimes widely changed. In which case, mounting of an orifice 11 enables the set pressure of the gas governor 9 to be increased by an amount equivalent to a decrease in the pressure of the orifice 11, and a gas flow rate is substrantially prevented from a change due to even slight unevenness in a set pressure. When low calorie gas is used, the orifice is removed and a plug is placed in an insertion port 12. Regulation during a change in a kind of gas is effected through regulation and replacement of a gas pressure regulating member, and this causes facilitation of a regulating work.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adjustment method when changing gas types in a gas appliance in which primary combustion air 1 is forcibly supplied to a burner.

Conventionally, primary air for combustion is supplied to the burner using the injector effect of the gas flow ejected from the gas nozzle.
When converting to a high-temperature gas such as 3A, you can have peace of mind by narrowing down the amount of gas ejected from the gas nozzle to the same flow rate in terms of calories as a low-temperature gas, and you can obtain a predetermined 1-time air suction effect using the injector effect. Because of this, the gas nozzle has been replaced with a smaller-diameter one, and the gas IE adjustment parts such as the gas governor installed in the gas passage have been adjusted, but this work is troublesome. , especially when replacing the gas nozzle with this and the gas control unit? The connecting pipe had to be removed, and depending on the model, it was sometimes difficult to remove, making changing the gas nozzle extremely troublesome.

The present invention focuses on the fact that in a gas appliance that forcibly supplies primary air for combustion to a burner, it is possible to supply 1jjLt of primary air regardless of the gas jetting speed from the gas nozzle, and In order to solve this problem, the nozzle pressure can be set so that the same flow rate of gas is ejected from the gas nozzle in terms of calories by changing or adjusting the gas pressure adjustment member provided in the gas passage without replacing the gas nozzle. The present invention provides an adjustment method for adjusting gas to gas conversion.

The present invention will be explained below with reference to the attached drawings.

Fig. 1 and Fig. 2 show a hot air type gas heater. and the air outlet (
An inner case (2)'f is provided to communicate with the air blower (3) and the combustion case (4) above the blower (3). (5) A in all figures
and B, and when the blower (3) operates, indoor air is sucked in from the suction port (1a) and from the exhaust port (4a) at the top of the combustion case (4). The hot combustion air is sucked and exhausted, mixed in the inner case (2), and blown out as warm air into the room from the outlet (1b). At this time, each burner (5) is Hosono combustion surface (5a
) through the flame hole and the air blowing inside it & (3)
Primary air for combustion is forcibly supplied from the primary air hole (5b) at the end of the mixing tube by the suction force. In addition, the primary air excess ratio (air amount/theoretical air violet) of each burner (5) is approximately 1.2 for burner A and approximately 1.2 for burner B by adjusting the opening degree of each air hole (5b). (It is set to about 0.9 at 51.

In the drawing (61 is a gas control unit), the gas nozzles (7) of each burner (5) are connected to the unit (6) with full valves (for communication pipes), in this case shown as B in the figure. Burner f51 Fi Gas is constantly supplied through the gas governor (91) provided in the gas passage of the unit (6), and the burner (5) indicated by A in the figure is further connected to the solenoid valve 1101 for temperature control from the governor (9). According to the load, the combustion state can be switched between a strong combustion state in which both the AB burners 151 and 51 burn, and a weak combustion state in which only the B burner (51) burns.

Here, the connecting pipe (8) of the gas nozzle (7) of the burner A (5) is arranged in front of the joint part with the gas nozzle +71i of the burner (5) of B, and the connecting pipe (8) as shown in Fig. 2. Therefore, in the method of the present invention, the gas nozzle 17) cannot be returned to its original state, and the adjustment at the time of changing the gas type is performed by replacing or adjusting the gas pressure regulating member provided in the gas passage. .

Hereinafter, the standard supply pressure of 100wH20 (from 06C gas to 13A gas with standard supply pressure of 200 m Bh O The method of the present invention will be explained using all the examples of adjustment when converting the gas type to .The calorie of 13A gas is about twice that of 6C gas, and the same flow rate as 6C gas in terms of calories is ejected from the gas nozzle f71. To make it so, volume flow sensitivity is 6
It is necessary to narrow down the pressure to 172 of 0 gas, and if the gas nozzle (7) is the same, the nozzle pressure needs to be set to 1/4 of 60 gas.

If only the gas governor (9) can be used, the gas nozzle (7)
The gas pressure applied to the gas, that is, the nozzle pressure, is equal to the set pressure of the gas governor (9), and if a gas nozzle (7) with a nozzle diameter of 1.5φ is used, the ejected gas flow rate will be, for example, 900 Kai/R in terms of calories. To do this, the nozzle pressure should be set to 40 wm H2O with 60 gas. Therefore, when converting to 13A gas, adjust the set pressure f 401111 H2 with the adjustment screw (9a) of the governor (91).
Adjust to 0, 174, 10 fin H20 and use the same calorie conversion flow t? You can get it.

In this case, if the nozzle pressure is set to 10 ws H*O, the flow rate of the ejected gas will slow down, and in a natural air supply type gas appliance that sucks primary air by the injector effect of the ejected gas flow, it will be 10 ws H*O.
Poor combustion occurs due to lack of secondary air, but in forced air gas appliances that forcibly supply primary air as described above, a predetermined amount of primary air is supplied regardless of the flow rate of the ejected gas, resulting in poor combustion. Does not occur.

The adjustment method when only the gas governor (9) is provided has been explained above, but the set pressure of the gas governor (9) changes over time due to deterioration of the pressure regulating spring (9b1, etc.), so the set pressure can be adjusted as described above. < 10 W If the pressure is set as low as HsO, the set pressure may change by 1φ due to changes over time or variations in adjustment.
Even if a slight error occurs, the error ratio with respect to the reference value increases, so the gas flow t changes significantly.

In this case, when converting to 13A gas, as shown in the third diagram, < 13-y is 1llll? By attaching l&, the footing of the gas governor (9) can be set higher except for the pressure drop at the orifice flit, for example, orifice 1lllt O,8
If the diameter is 5φ, what is the downstream nozzle pressure? 10■
The set pressure of the gas governor (9) required to adjust the pressure to H20 is 90cm, so even if there is some variation in the set pressure, the gas flow will not change substantially and the combustion condition will worsen. There isn't.

The orifice tin is connected to the gas control unit (6
When using 6C gas, remove it and plug the insertion port (l).In addition, for gas appliances that do not have a gas governor (9), ) can also be adjusted.

As described above, according to the present invention, in a gas appliance that forcibly supplies air, all the adjustments at the time of gas pressure conversion can be performed by adjusting or replacing the gas pressure adjusting member provided in the gas passage without replacing the gas nozzle. This makes the adjustment work easier, and in this case, the gas ejection speed from the gas nozzle is adjusted to the UK level, but since the secondary air is forcibly supplied, there will be no combustion failure due to a lack of primary air, and this is a safety issue. It also has an effect with no problems.

[Brief explanation of drawings]

Fig. 1 is a cut side view of an example of a gas appliance to which the method of the present invention is applied, Fig. 2 is a front view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cut cross section taken along the line I-1 in Fig. 2. It is a diagram.

Claims (1)

[Claims] A method for adjusting gas S conversion in a gas appliance that forcibly supplies primary air for combustion to a burner, in which the gas passage Vcgti is adjusted without replacing the gas nozzle facing the burner.
At the time of gas si+ conversion in a gas appliance, the nozzle pressure is set so that approximately the same flow rate of gas is ejected from the gas nozzle in terms of calories by adjusting or replacing the gas pressure adjusting member. How to decide M1 section