JPH06337111A - Gas combustion device - Google Patents

Abstract

PURPOSE:To provide a gas combustion device which causes no explosive ignition even when the device is operated after its operation has been stopped for a long period of time. CONSTITUTION:A gas combustion device has burner units 42, 52 for carrying out combustion, burner on/off valves 41, 51, a main on/off valve 10 for feeding gas from a gas feed source to the side of the burner on/off valves 41, 51 and for stopping the gas feed, and a diaphragm- type proportioning on/off valve 20 arranged at the intermediate portion of a gas passage 30 between the main on/off valve 10 and the burner on/off valves 41, 51. The diaphragm-type proportioning on/off valve 20 has a primary chamber 21 communicating with the gas passage from the side of the main on/off valve 10, a secondary chamber 22 communicating with the gas passage to the side of the burner on/off valves 41, 51, and a valve body 24 for increasing or decreasing an opening degree of a gas inlet port 23 with the aid of a diaphragm 27 according to an increase or a decrease of a gas pressure in the primary chamber 21. The operation of this gas combustion device is carried out in such a manner that the main on/off valve 10 is first opened for a short period of time before proceeding to an ignition operation, and the burner on/off valve 51 is then opened for a short period of time, thereupon the main on/off valve 10, the burner on/off valves 41, 51 and the diaphragm-type proportioning on/off valve 20 are continuously opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustion device used as a gas hot water supply device or the like.

[0002]

2. Description of the Related Art An example of a conventional gas combustion device will be described with reference to FIGS. Figure 1 is a so-called proportional on-off valve containment type, that is, the on-off valves are arranged in front and behind with the proportional on-off valve sandwiched,
FIG. 6 is a configuration diagram showing an example of a gas combustor of a type in which a gas passage portion having the proportional on-off valve is in a closed state when the front and rear on-off valves are closed. This configuration will be described first. Gas from a gas supply source (not shown) flows through the original opening / closing solenoid valve 10 and the diaphragm type proportional opening / closing valve 20 through the gas passage 30 and is further branched to each burner opening / closing solenoid valve 41,
It flows to two burner parts 42 and 52 via 51, and is used for combustion. The two burner parts 42 and 52 have one burner part 42 as a high capacity burner part and the other burner part 52 as a small capacity burner part, and can be switched by the burner opening / closing solenoid valves 41, 42. There is. 60 is a blower. This combustion device is configured as an instantaneous heating type hot water supply device,
A heat exchanger 71 that instantaneously heats water by combustion of the burner parts 42 and 52, a water inlet pipe 72 to the heat exchanger 71, and the water inlet pipe 72.
A water amount sensor 73 and an inlet water temperature sensor 74, a hot water outlet pipe 75 from the heat exchanger 71, a hot water outlet temperature sensor 76 and a water amount control valve 77 provided in the hot water outlet pipe 75 are provided. The diaphragm type proportional on-off valve 20 is internally provided with a primary chamber 21 that communicates with a gas passage 30 from the original on-off solenoid valve 10 side.
And a secondary chamber 22 communicating with the gas passage 30 to the burner opening / closing solenoid valves 41, 51 side, and a partition wall between the primary chamber 21 and the secondary chamber 22 has a secondary chamber from the primary chamber 21 side. A gas inlet 23 to the 22 side is provided, and a valve body 24 for opening and closing the gas inlet 23 is provided. When the solenoid 25 is turned on, the valve body 24 is pushed downward against the spring 26, and the gas inlet 23
Open up. Further, when the solenoid 25 is turned off, the restoring force of the spring 26 closes the gas inlet 23. Further, a diaphragm 27 is attached to the valve body 24, and when the gas pressure in the primary chamber 21 rises, the valve body 24 is moved in a direction in which the opening degree of the gas inlet 23 is reduced (upward in FIG. 1), When the gas pressure in the primary chamber 21 decreases, the valve body 24 is moved in a direction in which the opening degree of the gas inlet 23 is increased (downward in FIG. 1), so that the original opening / closing solenoid valve 10
The fluctuation of the gas supply flow rate accompanying the fluctuation of the gas pressure of the gas flow from the side is suppressed.

Reference numeral 80 is a controller, which inputs a command relating to the operation of the apparatus, and also inputs information from a water amount sensor 73 of each part of the apparatus and other sensors to give a predetermined control command to each of the valves 10 and 20, It outputs to 41, 51, blower 60, and an igniter (not shown). The control mechanism of the controller 80 when starting the combustion operation of the apparatus will be described with reference to FIG.
When the operation switch (not shown) is turned on and the water outlet pipe 75 is opened, the water amount sensor 73 detects a certain amount of water or more, and the controller 80, which has obtained the information, issues an operation start command for the blower 60. In order to release the pressure in the secondary chamber 22 of the diaphragm type proportional on-off valve 20 and to release the pressure in the secondary chamber 22 of the diaphragm type on-off valve 20, a command to open _one burner on-off solenoid valve 41 for a short time t ₁ (for example, about 0.5 seconds) is issued. And a constant prebarge time t ₂
Then, the ON command is sent to the igniter and the solenoid 25 of the original opening / closing solenoid valve 10, the burner opening / closing solenoid valve 51, and the diaphragm type proportional opening / closing valve 20 is turned on to continuously open each valve 10, 20, 51. Then, after a little delay, an ON command is issued to the burner opening / closing solenoid valve 41 to continue the opening. As a result, if normal, the solenoid 25 is turned on so that the valve body 24 gradually opens against the spring 26 and is supplied from the original opening / closing solenoid valve 10 side through the primary chamber 21 and the secondary chamber 22. The gas gradually increases, and the combustion in the burner parts 42, 52 gradually shifts from small combustion to normal combustion.

[0004]

However, in the above-mentioned conventional gas combustion apparatus, when the operation is not performed for a long time, the gas in the primary chamber 21 escapes to the back side of the diaphragm 27 and While the pressure rises relatively, the primary chamber 21
The relative pressure of the valve body 24 is lowered, so that the valve body 24 is pushed downward against the spring 26, and the gas inlet port 23 is almost fully opened regardless of the solenoid 25 being off. There was a problem of opening. When the valves 10 and 51 are opened at this fully opened state and combustion is started, the gas from the original opening / closing solenoid valve 10 side suddenly becomes large through the gas inlet port 23 close to full opening. There was a risk that it would flow into the burner section 52 at a flow rate and cause explosion and ignition.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the conventional gas combustion apparatus and to provide a gas combustion apparatus that does not cause explosive ignition even when the operation is performed after the operation is stopped for a long time.

[0006]

In order to achieve the above object, a gas combustion apparatus of the present invention comprises a burner section for performing combustion,
A burner opening / closing valve for supplying and stopping gas to the burner portion, a source opening / closing valve for supplying and stopping gas from a gas supply source to the burner opening / closing valve side, the source opening / closing valve and the burner opening / closing valve, At least a diaphragm type proportional on-off valve arranged in a gas passage between the diaphragm type proportional on-off valve and the primary chamber communicating with the gas passage from the original on-off valve side, and the burner on-off valve side. A secondary chamber communicating with the gas passage; and a valve body for increasing or decreasing the gas pressure in the primary chamber to reduce or increase the opening degree of the gas inlet port from the primary chamber to the secondary chamber via the diaphragm. A gas combustion device,
Before starting the ignition operation by continuously opening the original on-off valve, the burner on-off valve, and the diaphragm type proportional on-off valve, first open the original on-off valve for a short time, and then open the burner on-off valve for a short time. It is characterized in that the main opening / closing valve, the burner opening / closing valve, and the diaphragm type proportional opening / closing valve are continuously opened later.

[0007]

According to the features of the present invention described above, at the start of the operation of the gas combustion apparatus, first, before starting the ignition operation by continuously opening the original opening / closing valve, the burner opening / closing valve, and the diaphragm type proportional opening / closing valve, The gas is introduced into the primary chamber of the diaphragm-type proportional on-off valve through the main on-off valve by opening for a short time. As a result, the gas pressure in the primary chamber is increased, and even when the valve body is displaced to such a position as to open the gas inlet, the increase in gas pressure in the primary chamber causes The valve body is returned to the position where it closes the gas inlet through the diaphragm. Therefore, after that, the original opening / closing valve, the burner opening / closing valve, and the diaphragm type proportional opening / closing valve are continuously opened, and when ignition is performed, gas is supplied all at once in a state where the diaphragm type proportional opening / closing valve is close to full opening from the beginning, It is possible to surely prevent explosion and ignition.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a gas combustion apparatus showing an embodiment of the present invention,
FIG. 2 is a time chart explaining the control mechanism of the controller.

The entire structure of the gas combustion apparatus of the embodiment is the same as that described in the section of the prior art, except for the control mechanism of the controller, so the description thereof will be omitted. A specific example of the control mechanism of the controller 80 at the time of starting the combustion operation of the apparatus in the present invention will be described with reference to FIG. First, the operation switch (not shown) is turned on, and the tap pipe
When the water flow sensor 73 detects a certain amount of water or more by opening the 75 cullan, the controller 80, which has obtained the information, issues an operation start command for the blower 60. Then, after a lapse of a constant pre-barge time t ₂ , an ON command is issued to the igniter and an opening command is issued to the original opening / closing solenoid valve 10 to open the original opening / closing solenoid valve 10 for a fixed short time t _3. .
As a result, gas is introduced into the primary chamber 21 of the diaphragm-type proportional on-off valve 20 via the original on-off solenoid valve 10. Prior to this introduction, the valve body 24, which originally should have closed the gas inlet port 23, is displaced downward due to the pressure drop in the primary chamber 21, and the gas inlet port 23 is in a fully opened state or a state close thereto. There is a possibility that However, the original opening / closing solenoid valve 10
The pressure in the primary chamber 21 is increased by the primary opening of the valve body 24, so that the valve body 24 reliably seals the gas inlet port 23 via the diaphragm 27. The solenoid valve 10 is opened and closed for a fixed time t
After ₃ open, the controller 80, in turn, after a certain short time t _4, in a conventional manner gives the opening command of a certain short time t ₁ relative to the burner off solenoid valve 41. After releasing the gas pressure from the secondary chamber 22 by this, a constant short time t
After ₅ , the controller 80 turns on the solenoid valve 25 of the original opening / closing solenoid valve 10, the burner opening / closing solenoid valve 51, and the diaphragm type proportional opening / closing valve 20.
ON command is issued to each valve 10, 20, 51 to continuously open, and after a short delay, an ON command is issued to the burner opening / closing solenoid valve 41 to perform continuous opening. As a result, the valve body 24 is gradually opened against the spring 26, and the primary chamber 21, the secondary chamber from the original opening / closing solenoid valve 10 side.
The gas supplied through 22 gradually increases and the burner section
Combustion at 42 and 52 also gradually shifts from normal ignition to normal combustion.

In the above-described embodiment, the original opening / closing solenoid valve 10 may be opened for a certain period of time only when the device is not operated for a long period of a certain period or longer. In this case, by incorporating a timer in the controller 80, the fixed time can be detected and performed. In the above embodiment, the case where two burner parts and two burner opening / closing solenoid valves are provided has been described, but it is also possible to provide only one burner, or three or more burners.

[0011]

According to the present invention, which has the above-described structure,
According to the gas combustion apparatus described in (1), when starting the combustion operation of the apparatus, first, before starting the ignition operation by continuously opening the main on-off valve, the burner on-off valve, and the diaphragm type proportional on-off valve, first turn off the main on-off valve. The burner on / off valve is opened for a short period of time, then the burner on / off valve is opened for a short time, and then the main on / off valve, the burner on / off valve, and the diaphragm type proportional on / off valve are continuously opened. It is possible to reliably prevent explosive ignition due to sudden blowout of the fuel gas, and at the same time, it is possible to always ensure a gentle ignition and a subsequent transition to normal combustion.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a gas combustion apparatus showing an embodiment of the present invention.

FIG. 2 is a time chart illustrating a control mechanism of a controller.

FIG. 3 is a time chart illustrating a control mechanism of a controller in a conventional device.

[Explanation of symbols]

 10 Main open / close solenoid valve 20 Diaphragm type proportional open / close valve 21 Primary chamber 22 Secondary chamber 23 Gas inlet 24 Valve body 25 Solenoid 26 Spring 27 Diaphragm 30 Gas passage 41, 51 Burner open / close solenoid valve 42, 52 Burner section 60 Blower 80 Controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiko Kanayama 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (1)

[Claims] 1. A burner section for performing combustion, a burner on-off valve for supplying and stopping gas to the burner section, and a main on-off valve for supplying and stopping gas from a gas supply source to the burner on-off valve side. And a diaphragm type proportional opening / closing valve arranged in a gas passage between the original opening / closing valve and the burner opening / closing valve, the diaphragm type proportional opening / closing valve communicating with the gas passage from the side of the original opening / closing valve. A primary chamber, a secondary chamber communicating with the gas passage to the burner opening / closing valve side, and a gas inlet port from the primary chamber to the secondary chamber through a diaphragm due to an increase or decrease in gas pressure in the primary chamber. A gas combustion device having a valve body for reducing or increasing the opening degree, wherein the main opening / closing valve is first opened before starting an ignition operation by continuously opening the main opening / closing valve, a burner opening / closing valve, and a diaphragm type proportional opening / closing valve. Open for a short time, then A gas combustion apparatus, characterized in that the burner on-off valve is opened for a short period of time, and thereafter the main on-off valve, the burner on-off valve and the diaphragm type proportional on-off valve are continuously opened.