JPS58219320A - Combustion gas feeder - Google Patents

Abstract

PURPOSE:To switch the type of the gas easily and besides without the need of experienced skill, by a method wherein the mixture of a gas flow rate corresponding to each gas type and the air is obtained through operation of a pressure switching variable mechanism of a gas burner. CONSTITUTION:A casing 11 of a gas burner is provided with a valve body 14 secured to the center of a diaphragm 13, and a pressure regulating spring 15 exerting a force toward a direction in which the valve body 14 is opened, and the other end of a pressure regulating rod 17, making contact with a spring support 16 of the pressure regulating spring 15 and being vertically slidable, makes contact with a gas type switching cam 18. With a cam shaft 19 turned by a switching handle 20, the switching cam 18 also turns, the pressure regulating rod 17 slides to a given position, and the pressure regulating spring 15 is brought to a given bending state. A mixing part 24, provided with a gas jet port 22 and a blower 23 for feeding the air necessary to combustion, is disposed at the downstream of a gas burner 21 equipped with a pressure switching variable mechanism. This permits easy switching of a gas type, and eliminates the need to prepare various types of burner nozzles necessary to cope with the gas type to be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention facilitates gas type conversion, that is, conversion to a different type of gas such as natural gas or city gas, in a gas combustion appliance that has a gas nozzle that sets the combustion amount and a burner. The present invention relates to a combustion gas supply device that can provide combustion gas.

Generally, there are more than 10 types of fuel gas, and each gas type has a different calorific value per unit volume and supply pressure.

Ru. On the other hand, gas appliances require a predetermined amount of combustion regardless of the type of gas, so the gas flow rate must be changed according to each type of gas.

Figures 1 and 2 show a conventional combustion gas supply system, in which 1 is a well-known governor that keeps the pressure on the outlet side constant even if the supply pressure changes, 2 is a closing solenoid valve, and 3 is a solenoid valve. A burner nozzle is screwed onto the burner head 4; 5 and 6 are dampers that vary the opening area of the suction port S that sucks in the primary air necessary for combustion; 7 is a mixing tube; the gas passes through the mixing tube 7 to the burner (
(not shown). In this type of combustion gas supply device, when changing the gas type, for example, if the calorie is increased from city gas such as 6C to natural gas such as 13A, the pressure of the governor 1 is adjusted and the burner nozzle 3 is changed to a smaller diameter one. It is necessary to change the gas flow rate and adjust the primary air suction ports S of the dampers 5 and 6 so that the optimum amount of primary air is suctioned by the ejector effect caused by the gas ejected from the burner nozzle 3. .

Not only is it troublesome as described above, but it also requires preparing many types of burner nozzles 3 as service parts for each gas type, inventory storage management, and a large number of production models for each gas type. However, it was uneconomical as there was a lot of waste in factory costs and distribution service costs.Furthermore, it required skill to adjust when switching gas types, and there was a risk of an accident if the adjustment was made inappropriately.

In view of the problems of the conventional example, the present invention allows gas types to be changed easily and without requiring any skill, and eliminates the need to prepare many types of burner nozzles corresponding to the famous gas types. The purpose is to provide a new combustion gas supply device.

As a means for achieving this object, the present invention provides a gas governor having a variable secondary pressure switching function, a gas outlet downstream of the gas governor, and further supplies air necessary for combustion downstream of the gas outlet. It is equipped with a blower and a mixing section.

With this configuration, by switching the switching variable part of the gas governor in accordance with each gas type, the gas types 54, -,.

A gas flow rate corresponding to this can be obtained. Further, unlike the conventional method in which combustion air is sucked by the ejector effect of gas ejected from a burner nozzle, there is no need to supply air by a blower or to adjust a secondary air damper. In other words, by simply switching the variable switching section of the gas governor, the gas type can be easily and reliably changed without replacing parts such as the burner nozzle or adjusting the damper.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 3, reference numeral 11 denotes a gas governor casing, which has a valve body 14 fixed to the center of a diaphragm 13 and a pressure regulating spring 15 that applies force in the direction of opening the valve body 14. The other end of the pressure regulating rod 17 , which can slide downward in contact with the spring receiver 16 of 16 , is in contact with the gas type switching cam 18 . When the cam shaft 19 is rotated by the switching handle 2o, the switching cam 18 also rotates, the pressure regulating rod 17 slides to a predetermined position, and the pressure regulating spring 15 obtains a predetermined deflection.

Downstream of the gas governor 216 having the above variable pressure switching mechanism, a mixing section 24 equipped with a gas jet port 22 and a blower 23 for supplying air necessary for combustion is arranged. 2
6 is a solenoid valve.

The operation of the second configuration will be explained next.

First, when the switching handle 2o of the gas governor 21 is rotated to switch the position of the switching cam 18 according to the type of gas to be used, the pressure regulating rod 17 slides to a predetermined position, and the pressure regulating spring 15 is adjusted according to the type of gas. Switched to spring pressure. As mentioned above, when the solenoid valve 25 is opened in a gas circuit in which the pressure switching variable mechanism of the gas governor 21 has been switched in advance according to the type of gas used, the gas sent at the supply pressure is
The gas governor 21 sets a predetermined pressure according to the gas type,
The gas is guided to the gas outlet 22. The gas ejected from the gas ejection port 22 is mixed with air from the blower 23 in the mixing section 23, and flows out to a burner (not shown).

Here, the diameter of the gas ejection port 22 is simply given by γ page. Table 1 shows the specific gravity and calorific value of each gas, and the combustion amount is 5000 kcal/hr using equation (1).

When the differential pressure is 50 mm H2O, a large flow rate is required 6
When calculating D for C, it becomes φ3.6.

The diameter of the gas outlet 22 is constant φ3.6 and is 13A.

The differential pressure H at I and PG is calculated by modifying equation (1), and in the case of 13 people, it is 9.9 mmH2O, and I and PG are 4.9
mmH2O.

Gas type conversion is completed by switching with the pressure switching variable mechanism of the double-sided gas governor 21 to obtain a differential pressure corresponding to each of the gas types.

Note that the theoretical air amount required for combustion is generally 1 ml per 1000 kcal for each gas type, and the secondary air amount is the 6Q to TO ratio.

Therefore, the amount of air supplied by the blower 23 through each gas type is constant, and there is no need to adjust the amount of air.

In addition, when starting operation, the air volume is controlled by an electric circuit with a delay timer that opens the solenoid valve 25 after several seconds have elapsed since the blower 23 is energized. "Prevent shortages"] can be implemented immediately. Alternatively, the blower 23 can be used as a signal to open the solenoid valve 25.
By using a detector that detects the rotational speed, wind pressure, and air volume, it is possible to more reliably prevent insufficient air volume and open the solenoid valve 25 in a timely manner.

By the way, if the switching handle 20 of the variable pressure switching mechanism of the gas governor 21 is exposed to the outside of the instrument case, especially to the front, gas switching can be done very easily without removing a single screw or removing 9 pages. .

- As explained above, in this embodiment, the pressure regulating rod 17 of the gas governor 21, the switching cam 18. Switching of the variable switching mechanism consisting of a camshaft 19° switching handle 20, etc., switching handle 2
The gas type change is completed by simply rotating the o switch, and there is no need for troublesome work such as replacing the burner nozzle of the burner head or adjusting the air damper. be.

Furthermore, there is no need to prepare multiple types of burner nozzles for each type of gas, and there is no need to create multiple types of appliances for each type of gas, and distribution costs and production management costs can be significantly reduced.

FIG. 4 shows a second embodiment of the present invention, which has an electrical drive section in the pressure switching variable mechanism of the gas governor f19, and further has an electric contact 29 for switching gas type to send a signal to the electric drive section. It has an operation section 30, an operation section 32 having an electric contact 31 for switching capacity, and the like. Note that the same members and elements as those in the embodiment in FIG. 3 are designated by the same numbers and their explanations will be omitted.

10, -6. In this embodiment, the motor 26 is used as the electrical drive section of the pressure switching conversion mechanism. By forward and reverse rotation of the screw shaft 27 of the motor 16, the pressure regulating spring holder 28 moves up and down.
The spring pressure of the pressure regulating spring 15 changes. The gas governor 21 is
It is well known that the secondary pressure is maintained at a level proportional to the spring pressure of the pressure regulating spring 16. In this embodiment, when the knob 31 of the switching operation part 3o having the electric contact 29 for gas type switching is set to the position of the gas type to be used, the gas type signal is input to the central controller 33, and the central controller 33 2
The screw shaft 27 of No. 6 is rotated by a predetermined amount.

The pressure regulating spring retainer 28 moves in accordance with the rotation of the screw shaft 270, and the spring pressure of the pressure regulating spring 16 becomes a predetermined pressure. Therefore, simply by switching the knob 31 to the position of the type of gas used, the gas governor 21 automatically switches to a pressure that allows a predetermined gas flow rate to flow.

In addition, a switching operation section 32 having an electrical contact 34 for switching capacity.
By tilting the lever 35 to either a large or small capacity, the capacity signal also enters the central controller 33;
rotates the screw shaft of the motor 26 by a predetermined amount. At this time, the central controller 33 also controls the blower 23 in addition to the motor 26. For example, when switching the capacity from high to low, the rotation of the blower 23 is also lowered to the required air flow rate.

As described above, by providing the electric drive unit, it is not only possible to change the gas type only by operating the switching knob 31, but also it is possible and easy to change the capacity of the appliance.

Furthermore, as a so-called slow ignition function to reduce burner ignition noise at the start of operation, the electric drive unit can be kept at the low capacity position for several seconds at the beginning of operation, regardless of the position of the lever 35.

Further, by providing an electric drive unit, the combustion amount can be controlled steplessly by an external signal such as the temperature of hot water as necessary.

Although the present embodiment has been described using the motor 26 as the electric drive unit, similar actions and effects can be obtained by using a rotary lenoid or other electromagnetic drive device.

As explained in detail above, the present invention provides a gas governor having a variable pressure switching mechanism in the gas jet flow, and a blower for supplying combustion air is provided downstream of the gas jet port, so that each gas By simply switching the gas governor to the position corresponding to the species, it is possible to change the gas without replacing the burner nozzle, making it possible to change the gas easily and without requiring any skill.In addition, the air damper can be adjusted. To realize a combustion gas supply device that eliminates the need to prepare multiple types of burner nozzles corresponding to each type of gas.

Therefore, when changing gas types due to migration, etc., it can be done easily and reliably, and there is no need to prepare or store many types of burner nozzles, making management easier, reducing production management costs, distribution management costs, and It has many effects such as reducing market service costs, etc.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a combustion gas supply device showing a conventional example;
The figure is a partial detailed view of the same air damper, and FIG. 3 is a combustion gas supply device 3 showing the first embodiment of the present invention. ,,-2 Fig. 4 is a block diagram of a combustion gas supply device showing the second embodiment. 18...Switching cam, 19...Cam shaft,
20...Switching handle, 21...Gas governor, 22...Gas outlet, 23...
・Blower, 24...Mixing section, 26...
Solenoid valve, 26... Electric drive unit, 2 completed...
...Screw shaft, 28...Pressure adjustment spring holder, 29.
...Electric contact for gas type switching, 34...Electric contact for capacity switching. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Fig. h Fig. 3

Claims (6)

[Claims] (1) - A gas governor having a variable secondary pressure switching mechanism in the governor element that keeps the secondary pressure constant against fluctuations in the secondary pressure, a gas outlet provided downstream of the gas governor, and a downstream of the gas outlet A combustion gas supply device consisting of a mixing section installed in a combustion chamber and a blower for supplying combustion air, and configured so that a gas flow rate and air mixture corresponding to each gas type can be obtained by operating a variable pressure switching mechanism of the gas governor. ~ (2) The combustion gas supply device according to claim 1, wherein the variable pressure switching mechanism of the gas governor includes an electric drive unit such as a motor or an electromagnetic device. (3) The variable pressure switching mechanism of the gas governor has an electric drive section, and is provided with an electric contact for switching gas type and an electric contact for switching capacity for outputting a signal to the electric drive section. 27°-1 Combustion gas supply device. (4) The combustion according to claim 3, further comprising an electric circuit that operates the electric drive unit of the variable pressure switching mechanism of the gas governor in the low capacity position at the initial stage of energization, regardless of the position of the capacity switching electric contact. Gas supply equipment. (5) The combustion gas supply device according to claim 1, further comprising a solenoid valve and an electric circuit for energizing and opening the solenoid valve several seconds after the blower is energized. (6) The combustion gas supply device according to claim 3, further comprising an electric circuit for controlling the blower in accordance with the capacity switching signal.