JPS621544Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an external mixing type gas burner.

Conventionally, in externally mixed gas burners, pressure control and flow control must be performed to increase or decrease the combustion rate, requiring separate and expensive instruments.

In addition, the gas control valve, air control valve, and burner are built in, and are linked to keep the air ratio constant.
There are some that increase or decrease the amount of combustion, but in this case,
The control unit had drawbacks such as a complicated internal structure and a need for high gas pressure in order to match the gas flow rate characteristics to the air flow rate characteristics.

The present invention was developed in order to eliminate the drawbacks of the conventional external mixing type gas burner, and it can be easily achieved by proportionally changing the opening area to the gas nozzle and air nozzle with a simple configuration of rotating the rotor. The purpose of the present invention is to provide an external mixing gas burner that can vary the amount of combustion.

Next, the present invention will be explained with reference to the drawings which are one embodiment.

Reference numeral 1 denotes a casing, and the casing 1 is constructed by attaching a rear body 4 having an air nozzle 5 and a gas inlet 6 to a casing body 2 having an air inlet 3, and forming an air chamber 7 inside. In the center of the casing 1, a hollow rotor 9 is provided with a predetermined distance from the air nozzle 5, thereby forming an air passage 1.
4, a second cylindrical body 15 is interposed at the rear end thereof, and the second cylindrical body 15 is rotatably attached by a lever 10 via packings 16 and 17. The second cylindrical body 15, the rear main body 4, and the rotor 9 form a gas chamber 8. Further, a gas ejection hole 12 is provided on the outer periphery of the tip of the rotor 9, and a winding blade 18 is provided in the air passage 14.

As shown in FIG. 2, the air nozzle 5 is provided with an opening 20, and a first cylindrical body 13 having an opening 21 and having one end engaged with the rotor 9 is tightly held inside the air nozzle 5. Rotatably mounted,
It constitutes an air control valve section 19.

On the other hand, the second cylindrical body 15 is also provided with an opening 23 as shown in FIG. is provided to constitute the gas control valve section 22.

Therefore, when the lever 10 is rotated, the valve opening α formed by overlapping with the openings 20 and 21 of the air control valve section 19 and the opening 2 of the gas control valve section 22 are opened.
The opening area of each valve opening β formed by overlapping the valve openings 3 and 24 changes approximately linearly in proportion to the amount of rotation of the lever 10.

Next, the operation of the external mixing type gas burner having the above configuration will be explained.

In the illustrated state, when combustion air is supplied from the air inlet 3 and fuel gas is supplied from the gas inlet 6, the combustion air and fuel gas are The fuel gas flows into the nozzle 5 and the rotor 9, passes through the passage 11, jets out from the jet hole 12 into the air passage 14 at right angles, and mixes sufficiently with the swirling and jetting combustion air to form a spreading flame. Eventually, it will burn stably.

Here, in order to increase or decrease the combustion amount while maintaining the same air ratio, the lever 10 may be rotated.

That is, as shown in FIG. 4, when the rotor 9 is rotated by a predetermined angle by the lever 10, the first cylinder 1
3 are also interlocked, so the valve openings α and β change along lines c and d at approximately the same ratio. In this case, the relationship between the flow rate of air or gas and the amount of rotation of the lever 10 changes as shown by lines a and b, respectively, but both lines change in a similar manner. Therefore, the pressure drop ratio at maximum combustion of the gas control valve section 19 and the gas control valve section 22 is kept constant even if the valve opening is changed by combustion adjustment, so the ratio of air to gas is maintained the same. be done.

In the embodiment, the second cylindrical body 15 is fixed to the rear main body 4, but by moving the second cylindrical body 15 so as to be movable back and forth with respect to the rear main body 4, the openings 20 and 21 can be formed by overlapping each other. By changing the area of the valve opening β formed by the overlapping portion of the openings 23 and 24 while keeping the valve opening α constant, or by making it possible to replace the second cylindrical body 15 with a different opening 23, the valve opening α can be changed. , β can be changed to maintain a predetermined air-fuel ratio according to the required gas flow rate accompanying a change in fuel gas. Further, by changing the circumferential setting position of the opening 23 of the second cylindrical body 15 and changing and setting the initial value of the valve opening β, combustion can be performed in accordance with the desired combustion characteristics. That is, the b and d curves shown in FIG. 4 can be translated or the slope of the curves can be changed.

As is clear from the above description, according to the present invention, the valve openings of the air control valve section and the gas control valve section are controlled by rotating the rotor, which is the gas supply pipe.
Since they are changed proportionally in conjunction with each other, the combustion amount can be changed while maintaining the same air-fuel ratio. Furthermore, since both control valve sections are constructed by overlapping openings provided in the air nozzle and the first cylindrical body, and the rotor and the second cylindrical body, the structure thereof is extremely simple and inexpensive.

Further, since the control is performed using the cross-sectional area of the valve opening, even if the air supply pressure or the gas supply pressure is low, the control can be performed in exactly the same way.

[Brief description of the drawings]

Fig. 1 is a sectional view of an external mixing type gas burner according to the present invention, Fig. 2 is a sectional view of the air control valve section, and Fig. 3 is a sectional view of the external mixing type gas burner according to the present invention.
The figure is a sectional view of the gas control valve section, and FIG. 4 is a graph showing the relationship between the lever rotation amount and the valve opening area or gas/air flow rate. 1... Casing, 3... Air inlet, 4... Rear body, 5... Air nozzle, 6... Gas inlet, 9
...Rotor, 10...Lever, 12...Gas jet hole, 13...First cylindrical body, 14...Air passage, 15
...Second cylindrical body, 19...Air control valve section, 20,2
1... Opening, 22... Gas control valve section, 23, 24
...Opening.

Claims (1)

[Claims for Utility Model Registration] (1) A rotatable rotor having an internal gas passage and a gas jet hole facing the air passage on the outer periphery of the tip, and a rotating blade attached to the outside of the rotor. an air nozzle that forms an air passage with a casing, an air inlet and a gas inlet, an opening provided in the air nozzle for communicating the air inlet and the air passage, and a casing that rotates in conjunction with the rotor. an air control valve section consisting of a first cylindrical body having an opening for adjusting the opening area; a second cylindrical body interposed between the casing and the rotor and having an opening communicating with the gas inlet; Rotation causes the second
Consisting of an opening provided in the rotor to adjust the opening area of the cylinder, and a gas control valve section,
An external mixing type gas burner in which an air control valve and a gas control valve section are adjusted in conjunction with each other. (2) The external mixing type gas burner according to claim 1, wherein the opening position of the second cylindrical body is adjustable with respect to the rear main body. (3) The external mixing type gas burner according to claim 1, wherein the second cylindrical body is replaceable.