JPS58219321A - Combustion gas feeder - Google Patents

Abstract

PURPOSE:To obtain a gas flow rate corresponding to a switching position and to easily switch different kinds of gases, by constituting so that a gas governor and a variable throttle can be switched. CONSTITUTION:A casing of a gas governor is provided with a valve body 14 secured to the center of a diaphragm 13 and a pressure regulating spring 15 for exerting a force toward a direction in which the valve body 14 is opened, and a gas governor 18 consists of a pressure regulating rod 17 making contact with a spring supporter 16 of the pressure regulating spring 15 and being vertically slidable. Further, an inlet 21 of a variable throttle 20 is securly connected to an outlet 19 of the gas governor 18, and a plurality of throttle holes 23, each corresponding to a gas kind are formed in a rotating body 22. A flange cam 25 is secured to a rotating body shaft 24 integrally joined to the rotating body 22, and the flange cam 25 makes contact with the pressure regulating rod 17.

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.

31. Generally, there are ten or more types of fuel gas, and each gas type has a different calorific value per unit volume and a different supply pressure. On the other hand, gas appliances require a predetermined combustion amount regardless of the gas type, so the gas flow rate must be changed depending on each gas type.

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 sucked by the ejector effect caused by the gas jet from the burner nozzle 3. Many. As mentioned above, it is not only troublesome, but also requires preparing many types of burner nozzles 3 as service parts for each gas type, inventory storage management, and production models for each gas type. A large number of such products were required, which resulted in wasted factory costs and distribution service costs, which was uneconomical. Furthermore, adjustment required skill when switching gas types, and there was a risk of an accident if the adjustment was inappropriate.

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 each gas type. The purpose of this invention is to provide a new combustion gas supply device.

As a means to achieve this object, the present invention provides a gas governor having a variable secondary pressure switching function, a variable throttle mechanism that converts and adjusts the gas flow rate by varying the opening area, and a gas outlet on the downstream side. 6 blowers to supply the air necessary for combustion.5.・This is what is established.

With this configuration, by switching the variable part of the gas governor and the variable part of the variable throttle in accordance with each gas type, a gas flow rate corresponding to the gas type can be obtained. In addition, combustion is caused by the ejector effect caused by the gas ejected from the conventional burner nozzle.
Unlike the method in which secondary air is sucked, there is no need to adjust secondary air dampers, etc. since the secondary air is supplied by a blower. In other words, just by converting and adjusting the gas governor and variable aperture,
Gas types 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 16 that applies force in the direction of opening the valve body 14. A gas governor 18 is constituted by a pressure regulating rod 17 that can slide vertically in contact with a spring receiver 16 of 15. Further, a variable throttle 2 is provided at the outlet 19 of the gas governor 18.
The inlet 21 of the rotary body 22 is connected and fixed, and the rotary body 22 has several throttle holes 23 according to each gas type.
A flange cam 26 is fixed to the rotating body shaft 24 which is integral with the rotating body shaft 24, and the flange cam 26 and the end of the pressure regulating rod 1 are in contact with each other. 26 is a gas shutoff solenoid valve. 27 is a spout provided downstream of the variable throttle 20, 28 is a mixing section, and 29 is a
This is a blower that supplies the air necessary for combustion. FIG. 4 shows a plan view of the flange cam 25. In the above configuration, the operation will be explained next. First, depending on the type of gas used, the rotary body shaft 24 of the variable aperture 20 is rotated to switch the position of the flange cam 26, and the rotary body 24 of the variable aperture 2o is rotated.
The throttle hole 23, which is provided in
The pressure regulating spring 15 deflects for that gas type.

As mentioned above, in a gas circuit in which the variable mechanism has been switched in advance according to the type of gas used, when the gas shutoff solenoid valve 26 is opened, the gas sent at the supply pressure is changed to the gas type by the gas governor 18. When a predetermined pressure is applied, the variable throttle 2o enters the throttle hole 23, and the flow rate and potash corresponding to the gas type are ejected from the gas outlet 27, mixed with the air from the blower 29 in the mixing section 28, and the burner is heated. (not shown).

Here, the diameter of the gas ejection port 27 can be simply expressed as follows. Table 1 shows the specific gravity and calorific value of each gas, (1
) combustion amount 5oooKca7! /hr.

When the differential pressure is 60πmH2O, a large flow rate is required 6
When calculating D with respect to C, it comes out to be φ3.6.

The diameter of the gas outlet 27 was constant at φ3.6, and the number of people was 13.

When the differential pressure H in LPG is obtained by modifying equation (1),
For 13A(7), 99myxH20, LPG is 4
．． 9W7ffH20 Totoru.

In other words, the gas governor 18 and the variable aperture 2 are mechanically linked.
Gas type conversion is completed by interlockingly switching 0 and obtaining a differential pressure corresponding to each of the gas types.

The theoretical amount of air required for combustion is generally 1m per 1000Kcal for each type of gas, and -
The amount of missing characters is 60 to 70% of that.

Therefore, the amount of air supplied by the blower 29 is constant for each gas type, and there is no need to adjust the amount of air.

In addition, when starting the operation, the start-up characteristics of the blower 29 are controlled by an electric circuit with a delay timer that opens the gas shutoff solenoid valve 26 after a few seconds of energizing the blower 29. It is possible to prevent insufficient air volume due to Alternatively, if a detector that detects the rotation speed or wind pressure and air volume of the blower 29 is used as a signal to open the gas shutoff solenoid valve 26, a shortage of air amount can be more reliably prevented and the shutoff solenoid valve 26 can be opened in a timely manner. I can do it.

Note that by switching the settings of both the gas governor 18 and the variable throttle 2o, the flow rate can be set to a predetermined flow rate without having to have a very large variable range for the gas governor 18 or the variable throttle 20. Moreover, since the gas governor 18 and the variable throttle 20 are linked, the gas can be changed with one touch. If the knob portion of the rotary body shaft 24 is exposed to the outside of the case of the instrument, particularly to the front side, gas conversion can be performed very easily without removing a single screw.

As explained above, in this embodiment, the gas type change is completed simply by rotating the rotary body shaft 24 of the variable diaphragm 20 that interlocks with the gas governor 18, and the burner nozzle of the burner head can be replaced. , there is no need to adjust the air damper.

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

FIG. 5 shows a second embodiment of the present invention, in which an electric drive unit 30 is provided in at least one of the gas governor 18 and the variable throttle 20 that switch and vary the gas flow rate, and a signal is sent to the electric drive unit 3o. Electrical contact 3 for switching each gas type to send
1 and an electrical contact 33 for switching capacity.
It has an operation section 34 with a . Furthermore, the third
The same reference numerals are given to the same members and elements as those in the illustrated embodiment, and the explanation thereof will be omitted.

In this embodiment, the aperture hole 23 of the variable aperture 20 is
By rotating 2, the opening area can be changed to a continuous shape. When the knob 35 of the switching operation part 32, which still has the electric contact 31 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 37, and the central controller 3A switches the electric drive unit. (Electric motor in Figure 5) 30
Rotate it to the specified position. Therefore, simply by switching the knob 35 to the position of the type of gas used, the gas governor 18 and the variable throttle 20 are automatically switched to the position where a predetermined gas flow rate is caused to flow.

In addition, a switching operation section 34 having an electrical contact 33 for switching capacity
When the lever 36 is tilted to either increase or decrease the capacity, the capacity signal is also sent to the central controller 37, which rotates the electric motor 30 at a predetermined position. At this time, the central controller 37 also controls the blower 29 in addition to the electric motor 30. For example, when switching the capacity from dog to small, the rotation of the blower 29 is also lowered so that the required amount of air is blown.

As described above, by providing the electric drive section 30,
Not only is it possible to change the gas type only by operating the switching knob 35, but it is also 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 30 can be kept in the low capacity position for several seconds at the beginning of operation, regardless of the position of the lever 36.

By providing the electric drive unit 30, the combustion amount can be controlled steplessly by an external signal such as the temperature of hot water as needed.

As explained in detail above, the present invention provides a gas governor having a variable switching mechanism and a variable throttle upstream of the gas nozzle, and a blower for supplying combustion air downstream of the gas nozzle. By simply switching the gas governor and variable throttle to the positions corresponding to each gas type, gas conversion is possible without replacing the burner nozzle, and gas conversion is possible easily and without the need for skill. Furthermore, there is no need to adjust the air damper, and a combustion gas supply device that does not require the preparation of multiple burner nozzles corresponding to each type of gas is realized.

Therefore, when changing gas types due to migration etc., 13.
- It can be easily and reliably carried out, and there is no need to prepare or store many types of burner nozzles, making it easy to manage and reduce production management costs, distribution management costs, market service costs, etc. at the Carini factory. There are many effects.

[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, Figure 3 is a configuration diagram of a combustion gas supply device showing the first embodiment of the present invention, Figure 4 is a partial detailed view of the flange cam, and Figure 5 is the present invention. the second of
FIG. 1 is a configuration diagram of a combustion gas supply device showing an example. 18... Gas governor, 20... Variable throttle, 26... Gas closing solenoid valve, 27...
・Gas outlet, 28...Mixing part, 29...
...Blower, 3o...Electric drive unit, 31...
...Electric contact for gas type switching, 33...Electric contact for capacity switching. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
FgJ Figure 3 A 25m Nigo-241 Noro 13. . '. 222q ′1 °°鑵“°″0゜, ?

Claims (7)

[Claims] (1) - A gas governor that keeps the set secondary pressure substantially constant against fluctuations in the secondary pressure and has a variable switching mechanism for the set secondary pressure, a variable throttle that switches and varies the gas flow rate, and a variable throttle that switches and varies the gas flow rate. A gas outlet is provided downstream, a mixing section is further provided downstream of the gas outlet, and a blower for supplying combustion air is provided, and the gas governor and variable throttle are switched and variably controlled to generate the gas corresponding to the switching position. A combustion gas supply device configured to obtain a sufficient flow rate. (2) The variable throttle and gas governor switching mechanism are mechanically linked and interlocked, as claimed in claim 1.
Combustion gas supply device as described in section. (3) The combustion gas supply device according to claim 1, wherein at least one of the gas governor and the variable throttle has an electric drive section. (4) The combustion gas supply device according to claim 3, further comprising an electrical contact for switching the gas type and an electrical contact for switching the capacity that output a signal to the electric drive section. (5) The combustion according to claim 4, further comprising an electric circuit that controls the electric drive unit to maintain the gas amount at a low capacity position at the initial stage of energized operation, regardless of the position of the capacity switching electric contact. Gas supply equipment. (6) A gas shutoff solenoid valve is installed, and for a few seconds after the blower is energized,
The combustion gas supply device according to claim 1, further comprising an electric circuit for keeping the gas shutoff solenoid valve in a closed state. (7) 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.