KR910002883Y1 - Gas supply arrangements - Google Patents

Abstract

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Description

Gas supply device

1 is an explanatory diagram of main parts of a first embodiment of the present invention;

2 is a secondary pressure change diagram of the gas pressure control valve in the present invention.

3 is an explanatory diagram of main parts of a second embodiment of the present invention;

4 is an explanatory diagram of a third embodiment of the present invention.

5 is an explanatory diagram when assembling a proportional control valve.

6 is an explanatory diagram of another example of a delay means.

7 and 8 are conventional explanatory views.

FIG. 9 is a view of change of secondary gas pressure of the gas pressure regulating valve in the case of FIG.

* Explanation of symbols for main parts of the drawings

11: circle valve 11a: female coil

2: gas pressure regulating valve 20: gas pressure regulating proportional valve

30: main valve 30a: excitation coil

4: burner 4: timer

6: Normally closed output contact

The present invention relates to a gas supply device for a gas appliance, and more particularly, to a gas supply device for use in a gas introduction circuit up to a gas burner in a form employing assembly of an electromagnetic valve and a governor.

Usually, the gas appliance employs a gas introduction circuit composed of a combination of a mechanism stopper provided in the gas introduction portion of the gas appliance, and a control valve unit for controlling the ignition and combustion of the main burner while being installed downstream.

The control valve unit is provided with a main valve at the most upstream side thereof, and the gas introduced through the mechanism plug is introduced into the control valve unit from this main valve again.

In addition, a gas pressure regulating valve is assembled in the gas introduction circuit in order to ensure the safety of combustion or the stability of the combustion capacity.

In recent years, many gas appliances are used to control combustion of burners by using various electric devices, and solenoid valves are used for the valves constituting the control valve unit in addition to the main valve.

In such a gas appliance, a gas supply circuit as shown in FIG. 7 is adopted and a control valve in which a main valve 30 composed of a cock type mechanical plug 10 → a gas pressure regulating valve 2 → a solenoid valve is provided on the uppermost side. The unit structure of the unit 3 → the burner 4 is assumed.

In the use of the mechanism, when the mechanism stopper 10 is opened by manual operation and the mechanism is started, the main valve 30 supplies gas to the burner 4 through the control valve unit 3 at the same time, and at the same time, the ignition device is turned on. The burner 4 performs a combustion action by operating.

When the operation of the mechanism is stopped, each part of the control valve unit 3 is returned to its initial state by the stop operation to extinguish the burner 4 (all burners including the ignition burner if there is a ignition burner).

This is because the most upstream side of the control valve unit 3 is blocked by the main valve 30.

In the mechanism adopting the control valve unit 3 using the solenoid valve, the configuration for the operation is very simple and the stop state is obtained by simple operation. The mechanism stopper 10 is manually opened and closed by human operation. It is easy to forget sometimes to close the instrument stopper (10).

By the way, the gas pressure regulating valve 2 inserted into the gas circuit connects the diaphragm 21 and the valve body 22 as shown in this figure.

The diaphragm 21 and the valve body 22 are provided on the primary side (pressure entering the gas pressure regulating valve 2 and acting on the diaphragm), and on the atmospheric pressure side (upper side of the governor 2 acting on atmospheric pressure). The differential pressure setting spring 23 is provided to stabilize the secondary pressure (pressure acting on the spring flowing out of the gas pressure regulating valve 2) by these actions.

Therefore, if the mechanism stopper 10 is prevented from being opened as described above, the diaphragm 21 is placed in a state in which the primary gas pressure is applied, and the valve body 22 is in a completely closed state or a state of being closed at least. Deformation of (21) is also left in a more severe state.

If this state is left for a long time, permanent deformation occurs in the diaphragm 21, thereby impairing the gas pressure adjusting function.

Therefore, in order to solve this problem, it can be considered that the mechanical stopper 10 is replaced with the solenoid valve (hereinafter referred to as the one-way valve) such as the main valve 30 to operate synchronously with the main valve 30 as shown in FIG. have.

In this case, since both the upstream side and the downstream side of the gas pressure regulating valve 2 are shut off at the time of the mechanism stop, since the high pressure is not applied to the diaphragm 21, the above-mentioned irrational point can be eliminated.

In this latter case, however, an explosion may occur during the ignition operation at the start of the instrument.

If the original valve 11 and the main valve 30 are opened simultaneously at the start of the mechanism, the primary pressure is not applied to the diaphragm 21 in the initial state at the beginning of the gas supply, and the valve body 22 is completely opened. This is because the valve body opening degree becomes excessive until the primary pressure acts on the diaphragm 21 and the secondary pressure reaches the set sum.

That is, excessive gas flows to the downstream side until the gas pressure regulating valve becomes stable, and the secondary side exhibits the gas pressure change as shown in FIG.

The present invention responds to the pressure change on the primary side between the one-valve installed in the gas introduction portion to the mechanism and the main valve installed on the upstream side of the control unit, and the opening degree changes, and the pressure on the secondary side is set to the set pressure. In the gas supply circuit with the gas pressure regulating valve 2 inserted therein, it prevents the irrational point of the deterioration of the function of the diaphragm 21 caused by forgetting the closing of the original valve, and at the time of mechanism start ignition. This is to prevent problems such as explosion and ignition, and to achieve this purpose, the main valve opens after opening the one valve only by starting operation of the mechanism, and when the operation stops, the one valve and the main valve are automatically closed at the same time. It is a technical problem.

Technical means of the present invention for solving the above technical problem, both the main valve 11 and the main valve 30 as the solenoid valve, the excitation coil (11a) and the excitation coil (11) of the main valve (11) 30a) is connected in parallel and connected to the start switch 7 together, and the output contact of the delay means which is put into operation by closing the start switch 7 is inserted into the circuit of the excitation coil 30a of the main valve. The delay time by means is set to more than the required time until the valve body 22 of the gas pressure regulating valve 2 transitions from an initial state to a minimum closed state.

The technical means of the present invention acts as follows.

When the start switch 7 is turned ON, the excitation coil 11a of the one-way valve 11 is first brought into a conducting state, the one-way valve 11 is opened, and the primary side of the gas pressure regulating valve 2 is pressurized. The valve body 22 in the state is in the minimum closed state or the fully closed state.

At the same time, when the delay means is operated and the delay time has elapsed, the output switch inserted into the circuit of the excitation coil 30a side of the main valve 30 is closed so that the excitation coil 30a is turned on so that the main valve 30 is opened and the control valve unit In (3), gas is supplied to the burner (4).

The secondary gas pressure change of the gas pressure regulating valve 2 at the start of the gas supply is as shown in FIG. 2 and is ignited between the time from the start of gas supply until the set pressure remains constant, and then the burner Combustion continues

During the ignition time, since the state is set to the set pressure state from the minimum closed state, no excessive gas flows therebetween.

When the start switch 7 is opened, the circuits of the excitation coils of the original valve 11 and the main valve 30 are cut off and these valves are automatically closed together.

Therefore, the mechanism is stopped in the state in which excessive pressure is not applied to the primary side (diaphragm) of the gas pressure regulating valve 2.

The present invention has the following peculiar effects with the above configuration.

When the mechanism is stopped, the one-way valve on the upstream side of the gas pressure regulating valve is reliably closed. For this reason, the diaphragm function is lost due to forgetting to close the one-valve valve. There is no excessive flow of gas, so no explosion ignition occurs during ignition.

Also, even when the overflow prevention valve is assembled on the upstream side of the mechanism, there is no excessive flow rate at the start of the gas supply, i.e., no overflow condition occurs. The problem that the excess outflow prevention valve is operated also does not occur.

In the first embodiment shown in FIG. 1, the normally closed output contact 6 to which the timer 5 as a delay means provided in parallel with the exciting coil 11a of the one-valve 11 is always connected, It is inserted into the circuit of the excitation coil 30a of the main valve 30, and the gas circuit is a circuit structure of the original valve 11-gas pressure regulating valve 2-main valve 30-burner 4. As shown in FIG.

When the start switch 7 is turned on and closes, the one-valve 11 is opened, and at the same time, the timer 5 is operated and the normal closing output contact 6 of this timer is opened, and the predetermined time of the timer 5 is opened. After the set time elapses, the normally closed output contact 6 closes.

Therefore, the main valve 30 is opened after a predetermined set time of the timer 5 has elapsed at the opening of the one-valve 11.

In addition, the start switch 7 is opened, the circuits of the excitation coils and other control circuits are cut off, and the one-valve 11 and the main valve 30 are in the open mechanism stop state.

Next, the second embodiment shown in FIG. 3 employs a gas pressure regulating valve that automatically changes the secondary pressure in accordance with a signal input, that is, a valve having a proportional control valve function. It is used to set the hot water holding device of the water heater.

Some of these gas pressure regulating proportional valves have been disclosed in Japanese Utility Model Publication (Publication No. 59-18216), for example, and applied voltage setting means 25 in accordance with the signal input from the sensor S for detecting the output of hot water. Change in the applied voltage to the electromagnetic coil 24 and the elastic magnetic force applied to the plunger 26 integrated with the valve body 22 to change according to the output fluctuation of the secondary pressure hot water, and the combustion fire power of the burner is controlled. do.

Also in this case, the diaphragm 21 and the valve body 22 are integrally connected, and the gas pressure adjustment function is exhibited. The secondary pressure is maintained at the set pressure at each time point even if the primary pressure fluctuates.

In this embodiment, the closing voltage of the starting pressure switch 7 is applied to the electromagnetic coil 24 of the gas pressure regulating proportional valve 20, and the valve body 22 is provided with a holding force toward the open side. It's working.

At this time, since the original valve 11 is already in the open state, the maximum gas pressure is applied to the primary side of the valve body 22, and the valve body 22 is shifted to the minimum closed state.

Subsequently, when the set time of the timer 5 has elapsed as in the first embodiment, the main valve 30 is opened, and the gas pressure on the secondary side changes over time as in the first embodiment.

Next, the embodiment shown in FIG. 4 is a combination of the first and second embodiments, and the gas pressure regulating proportional valve 20 having the proportional control valve function in series with the normal gas pressure regulating valve 2 is used in series. It is inserted between the valve 11 and the main valve 30.

In this case, when the one-way valve 11 is opened, the gas pressure regulating valve 2 and the gas pressure regulating proportional valve 20 are first shifted to the minimum closed state, and after the main valve 30 is opened, they are changed to the respective set pressure states. .

When the valve of the type which does not have a gas pressure adjustment function is adopted as a proportional control valve, this proportional control valve 32 is normally accommodated in the control valve unit 3 mentioned above like FIG.

However, even if the proportional control valve of this type is inserted between the gas pressure regulating valve 2 and the main valve 30, there is no risk of adversely affecting the gas pressure regulating performance of the gas pressure regulating valve.

All the above embodiments employ the timer 5 as the delay means, but in the mechanism to be provided with the blowing fan, a combination of the blowing fan 8 and the wind pressure switch 9 to be inserted into the blowing circuit 81 can be employed as the delay means. The pressure receiving portion 91 of the switch may be inserted into the blower circuit and the output contact 92 which is always open of the wind pressure switch may be inserted into the circuit on the side of the excitation coil 30a of the main valve 30. .

In this case, when the start switch 7 is turned on, the blower fan 8 is opened simultaneously and the blower fan 8 is driven to generate air flow in the blower circuit 81. In the wind pressure switch 9 operates to generate a certain time difference until the contact is closed, and acts as if the timer 5 is installed.

As such a delay means, a significant time difference (approximately) from the opening of the original valve 11 to the opening of the main valve 30 is required until the valve body of the gas pressure regulating valve 2 becomes the minimum closing state from the initial state. Various delay means of Hanji can be used.

Claims (1)

Gas pressure adjustment between the one-valve installed on the gas inlet to the mechanism and the main-valve installed on the uppermost side of the control valve unit, the opening degree changes in response to the pressure change on the primary side and the pressure on the secondary side is maintained at the set pressure. In the gas supply circuit provided with the valve 2, the excitation coil 11a of the solenoid valve 11, which is a solenoid valve, and the excitation coil 30a of the main valve 30 are connected in parallel to the start switch 7 together. Connected to the circuit of the excitation coil 30a of the main valve, an output contact of a delay means which is brought into operation by closing the start switch 7 is provided. A gas supply device which is set longer than the time required for the valve body 22 to transition from the initial state to the minimum closed state.