JPH02143014A - Gas change-over device for combustion apparatus - Google Patents

Abstract

PURPOSE:To simplify the adjustment work corresponding to the new sort of gas by a method wherein the pressure at a nozzle is detected, and the pressure at the nozzle is regulated to a pressure suitable for the new gas sort set in a gas sort change-over switch corresponding to the detected pressure. CONSTITUTION:Signals from a pressure sensor 7 and a room temperature sensor 17 are input to a controller 9 that controls an ignition trans 18, a proportioning valve 11, a combustion fan 16 and a flame detector 14. When a new gas sort which is different from pre-set one in a combustion apparatus is used, a nozzle is replaced with another one suitable for the new gas sort, and a gas sort change-over switch 8 is switched to the new gas sort. The gas sort change-over switch 8 controls the proportioning valve 11 to a valve lift suitable for the new gas sort according to the signal from the pressure sensor 7. The adjustment work corresponding to a change in the gas sort becomes simple without a fail.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gas type switching device for a combustor that allows easy adjustment of nozzle pressure according to the gas type.

(Prior art) In a combustor that uses city gas or LP gas as fuel, the nozzle diameter and nozzle pressure of the combustor are set to match the applicable gas type when the combustor is manufactured. When a combustor is moved from a city gas area to an LP gas area due to a user moving, it is necessary to set the nozzle diameter and nozzle pressure according to the type of gas to which the combustor is applied.

(Problem to be solved by the invention) However, the operations associated with changing the nozzle diameter and nozzle pressure according to the type of gas applied to the combustor are troublesome and require a considerable amount of time.
Further, adjusting the nozzle pressure requires a certain degree of skill, and it is possible to forget to close the pressure detection port after the nozzle pressure is fully determined.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a gas type switching device for a combustor that allows the nozzle pressure to be adjusted by simply selecting a gas type switching switch. .

[Structure of the invention]

(Means for Solving the Problems) The combustor gas type switching device of the present invention includes a pressure sensor that detects the pressure in the nozzle section, a gas type changeover switch that selects the gas type, and a signal from the pressure sensor that controls the nozzle pressure. and a control device for controlling the system.

(Function) In the combustor gas type switching device of the present invention, when the gas type switching switch is set to the applicable gas, the nozzle pressure is controlled by the control device according to the pressure in the nozzle detected by the pressure sensor. , there is no need to separately adjust the nozzle pressure,
It is a short work.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the combustor gas type switching device of the present invention is applied to a hot air heater, in which a warm air outlet 2 is provided at the upper front of the main body 1 of the hot air heater, and a warm air outlet 2 is provided at the lower front of the main body 1 of the warm air heater. is provided with an air suction port 3. A burner section 4 and a heat exchanger 5 are disposed on the inner front side of the hot air heater main body 1, and a convection fan 6 is disposed below the burner section 4 and a heat exchanger 5.

The gas type switching device for the combustor has a pressure sensor 7 that detects the pressure in the nozzle section, a gas type changeover switch 8 that selects the gas type, and a control device 9 that controls the nozzle pressure using a signal from the pressure sensor. The pressure sensor 7
is arranged in a gas pipe line 12 connecting a nozzle 10 attached to the burner section 4 and the proportional valve]1, detects the gas pressure flowing through the gas pipe line 12, and sends the signal to the control device 9. . A gas type changeover switch 8 for selecting a gas type is incorporated into this control device 9. Further, the spark plug 13 and flame detector 14 provided in the heat exchanger 5 are controlled by the control device 9 described above.

Further, an air supply/exhaust top 15 provided on the hot air heater main body 1 is connected to the burner section 4 via a combustion fan 16.

In FIG. 1, reference numeral 17 is a room temperature sensor, and 18 is an ignition transformer.

FIG. 2 shows a block diagram of the control device 9, and shows the pressure sensor 7.
and the signal from the room temperature sensor 18 are sent to the control device 9, and the signals output therefrom control the ignition transformer 19, the proportional valve 11, the combustion fan 16, and the flame detector 14. A gas type changeover switch 8 incorporated in this control device 9 enables control according to the gas type.

That is, by switching the gas type selector switch 8, 6B gas, 6C gas, 13A gas, and LP gas can be selected as shown in Fig. 3, and the nozzle pressure (P n) and proportional valve current value (A) of each gas type can be selected. I understand the relationship.

Further, in the pressure sensor 7, as shown in FIG. 4, there is a linear relationship between the pressure (P) and the voltage (mV).

However, if the combustor is to be used with a gas type different from the preset gas type due to moving etc., replace the nozzle with a nozzle diameter that matches the gas type to be used, and switch the gas type switching device. Change the switch to match the gas type. By switching the gas 8 changeover switch, the opening degree of the proportional valve 11 is controlled by the detection signal of the pressure sensor 7, and the gas pressure flowing through the gas pipe 12 is controlled.

〔Effect of the invention〕

As described above, according to the present invention, the nozzle pressure is controlled by detecting the pressure in the nozzle part, and the pressure of the gas type is automatically adjusted using the gas type changeover switch, so the operation is easy and the adjustment is easy. The effect is that there are no mistakes and the work can be completed in a short time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example in which the combustor gas type switching device of the present invention is applied to a hot-air heater, FIG. 2 is a control block diagram of the combustor gas type switching device of the present invention, and FIG. FIG. 4 is a diagram showing nozzle pressure and proportional valve current characteristics, and FIG. 4 is a diagram showing nozzle pressure and output characteristics of a pressure sensor. 7... Pressure sensor, 8... Gas type selection switch, pressure 9... Control device, 10... Nozzle 10.11...
proportional valve. Applicant's representative Mr. Sato Figure 1 Figure 2 Figure 3 Figure V Figure 4

Claims (1)

[Claims] A gas type switching device for a combustor that includes a pressure sensor that detects the pressure in a nozzle section, a gas type switching switch that selects a gas type, and a control device that controls the nozzle pressure using a signal from the pressure sensor.