JPH1047663A - Protector for gas appliance, and gas appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the overflow of gas from a throat part by inactivating a gas supply means, answering the detection output of the detection means which detects gas having overflowed from a throat part. SOLUTION: At the point of time when the value of this electromotive force goes up and reaches the first set value being set in advance by the heating of the first thermocouple 6a, a first gas stopcock 33 and a second gas stopcock 34 are opened. By the opening of this first gas stopcock 33, the gas supply from the first nozzle 3a to the first mixing pipe 2a is stopped, and the overflow of the gas from a throat part 20 is finished, and the combustion of high- concentration gas is finished. Moreover, by the opening of the second gas stopcock 34, the gas supply from the second nozzle 3b to the second mixing pipe 2b is stopped, and the combustion in the second burner 1b is finished. Hereby, the damage of an apparatus within a casing by the continuity of the combustion of gas is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for a gas appliance, and more particularly to a gas supply device for supplying gas in a jet state and a throat portion for sucking the gas in the jet state together with primary air. The present invention relates to a gas appliance protection device for appliances.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view of a conventional table stove (1). The conventional table stove (1) shown in FIG.
A nozzle (9b) provided at the downstream end of the gas supply path and ejecting gas, and a throat (9a) for sucking the gas ejected from the nozzle (9b) together with the primary air are provided. . A gas supply passage for supplying gas to the nozzle (9b) is provided with a gas stopper (93) for turning on and off the supply.

The throat section (9a) is provided at an upstream end of a mixing pipe (92) for mixing the sucked gas and primary air, and is provided at a downstream side of the mixing pipe (92). , A burner head (91) is continuously provided. This burner head (91)
In, the mixed gas of the gas supplied from the mixing pipe (92) and the primary air is burned. By this combustion, the burner head
The food inside the pot or the like arranged above (91) is heated.

[0004]

However, if the flame hole (not shown) of the burner head (91) is clogged due to boiling over from the pot or the like, the gas from the nozzle (9b) causes the mixing pipe ( 92) The pressure inside the nozzle (9b)
Gas from the throat (9a) becomes difficult to be sucked into the throat (9a), and the gas overflows from the throat (9a).

[0005] The overflowing gas is supplied to a table stove.
When it flows through the casing (10) of (1) and reaches the burner head (91), it is ignited by the flame in the other flame hole extinguished by the above-mentioned fire hole in the burner head (91).
In addition, it is ignited by the heat of the burner head (91), and it is also ignited immediately after the fire is extinguished due to boiling over and when re-ignited. By this ignition, the gas overflowing from the throat portion (9a) extends outward from the throat portion (9a) and burns as a flame that contacts equipment in the casing (10).

However, the overflow of gas from the throat portion (9b) is not stopped unless the user closes the gas stopper (93), so that the combustion continues. This continued combustion results in damage to the equipment. SUMMARY OF THE INVENTION It is an object of the present invention to provide a protection device for a gas appliance in which overflow of gas from a throat portion is suppressed.

A seventh object of the present invention is to provide a gas appliance which suppresses gas overflow from the throat portion.

[0008]

The object of the present invention is to provide a gas supply means for supplying a gas in a jetted state and an upstream end of a mixing pipe reaching a burner head. A gas appliance protection device for use in a gas appliance comprising: a throat portion that sucks the gas in a spouted state together with primary air; a detection device that detects that gas has overflowed from the throat portion; and the detection device. And control means for deactivating the gas supply means in response to the detection output of (i).

In this apparatus, when the gas supplied from the gas supply means to the throat section overflows from the throat section due to clogging of the burner head or the like, the fact is detected by the detection means, and the detection is performed. The control means responsive to the output deactivates the gas supply means. Thereby, the gas supply to the throat portion by the gas supply means is stopped.

Here, as in the second aspect of the invention, "the detecting means includes a combustion detecting means for detecting the occurrence of combustion of the gas overflowing from the throat portion, and the control means includes the combustion detecting means. Deactivates the gas supply means in response to the detection output of (1), the fact that the gas has overflowed from the throat portion is detected as the occurrence of combustion. Also, as in the invention according to claim 3, "the detecting means includes pressure detecting means for detecting that the pressure in the mixing pipe has reached a predetermined pressure, and the control means includes a detection output of the pressure detecting means. Deactivate the gas supply means in response to
The fact that the gas overflows from the throat portion is detected as the fact that the pressure in the mixing pipe has reached the predetermined pressure.

[0011] According to the second aspect of the present invention, in the fourth aspect,
As described in the invention of the above, the "combustion detecting means includes a temperature detecting means disposed at or near the throat portion and detecting the temperature of the combustion", wherein the generation of gas combustion described above is caused by the throat portion or The temperature of the combustion in the vicinity is detected. According to a fifth aspect of the present invention, the flame detecting device is mounted on a flame receiving plate arranged so that a flame extending outward from the throat portion caused by the combustion comes in contact with the flame detecting plate. Since the receiving plate contacts the flame generated by the combustion, the heat of the flame is efficiently transmitted to the temperature detecting means by the flame receiving plate.

Further, as in the invention of claim 6, the throat portion is arranged in such a manner that at least a part of the inner surface is formed in a substantially tapered shape whose diameter is reduced inward and the axis is substantially horizontal. The flame receiving plate is provided in a substantially horizontal posture at a position near the upper side of the opening on the outer side of the throat portion. ” While the flame tends to extend upward, the flame receiving plate is connected in a substantially horizontal position to a position near the upper side of the outer opening in the throat portion. The flame comes into contact with the plate.

[0013] The object of the present invention is to provide a gas supply means for supplying a gas in a jetting state, and a method for supplying the gas in the jetting state to the primary air at an upstream end of a mixing pipe reaching a burner head. A throat part for sucking together with the gas, wherein the gas supply means is responsive to a detection output of the combustion detection means, and a combustion detection means for detecting the occurrence of combustion of the gas overflowing from the throat part. And deactivating control means ”.

According to this embodiment, the same effects as those of the first and second aspects are obtained.

[0015]

As described above, according to the first aspect of the present invention, when the gas overflows from the throat portion, the fact is detected by the detection means, and the control means responding to the detection output detects the gas overflow. Gas ejection from the supply means is stopped. Therefore, the overflow of the gas from the throat portion is suppressed.

Thus, even if the gas overflowing from the throat reaches the burner head and ignites, the combustion of the gas is not continued, and the gas appliance is not damaged by the continuation. According to the fourth aspect of the present invention, the occurrence of the combustion of the gas is detected as the temperature of the combustion at or near the throat portion, so that the configuration for detecting the occurrence of the combustion is simplified.

According to the fifth aspect of the present invention, since the heat of the combustion flame is efficiently transmitted to the temperature detecting means by the flame receiving plate, the temperature detection by the temperature detecting means is ensured. According to the invention of claim 7, the same effect as that of the above-described claim 1 can be obtained.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a plan view of a table stove (1) according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of the first mixing pipe (2a) and the first nozzle (3a) of FIG. 1 when viewed from the side, and FIG.
It is a top view of (0).

As shown in FIG. 1, in this embodiment, the present invention is applied to a so-called parent-child burner type table stove (1). [Regarding Configuration of Each Part] * First and second burner heads (1a) (1b) * A ring-shaped first burner head (1a) having a substantially horizontal posture is provided in the casing (10) of the table stove (1). And a columnar second burner head (1b) arranged substantially coaxially on the inner peripheral side thereof and having a substantially vertical posture.

The first burner head (1a) is provided with a plurality of flame holes (11) at a predetermined pitch along the outer peripheral edge and the inner peripheral edge of the upper end thereof. The other second burner head (1b) has a plurality of flame holes (12) (12) arranged at a predetermined pitch along the outer peripheral edge of the upper end thereof. At a position near the outer peripheral side of the second burner head (1b), a second thermocouple (6b) that detects the temperature of the second burner head (1b) and outputs an electromotive force corresponding to the temperature is provided. Are located. This second thermocouple
(6b) is connected to a control circuit (5) described later.

* First and second mixing pipes (2a) and (2b) and first and second nozzles (3a) and (3b) * The first burner head (1a) is arranged to extend in a tangential direction. Further, a first mixing pipe (2a) for mixing the gas and the primary air and leading the mixed gas to the first burner head (1a) is connected. On the upstream side of the first mixing pipe (2a), a first gas supply path (31) for supplying gas to the first mixing pipe (2a) is provided, and the first gas supply path (31) is provided. 31) at the downstream end
A first nozzle (3a) for ejecting the gas to the throat portion (20) of the mixing pipe (2a) is provided. The first gas supply path (31) is provided with a first gas stopper (33) for turning on / off gas supply to the first nozzle (3a). This first
The gas stopper (33) is connected to a control circuit (5) described later.

The second burner head (1b) is disposed substantially parallel to the first mixing pipe (2a) and mixes gas and primary air to guide the mixture to the second burner head (1b). 2 mixing tubes (2b)
Is connected. A second mixing pipe (2b) is provided upstream with a second mixing pipe (2b) for supplying gas to the second mixing pipe (2b).
A gas supply path (32) is provided, and the second gas supply path (3
At the downstream end of (2), a second nozzle (3b) for ejecting the gas to the throat (28) of the second mixing pipe (2b) is provided. The second gas supply path (32) is provided with a second gas stopper (34) for turning on / off gas supply to the second nozzle (3b). This second gas stopper (34) is connected to a control circuit described later.
Connected to (5).

* Throat part (20) * As shown in FIGS. 2 and 3, a certain range from the upstream end of the first mixing pipe (2a) is primary along with the gas ejected from the first nozzle (3a). It is a throat part (20) for sucking air. This throat part (20) is a straight cylindrical part (20a) with a constant diameter.
And a tapered tubular portion (20b) continuous with the downstream side and reducing in diameter toward the downstream side. The axis of the throat portion (20) is substantially horizontal. And throat part (20)
The above-mentioned first nozzle (3a) is coaxially inserted and arranged inside.

The straight cylindrical portion (20a) is fitted with a circular dish-shaped damper (4) that covers the outer peripheral surface of the straight cylindrical portion (20a) in a contact state. An opening (41) of a predetermined shape is formed in the bottom wall of the damper (4), and the opening (41) and the opening (21) at the upstream end of the throat (20) are connected to the throat. Department (20)
A primary air port for taking in the primary air is formed. Then, rotate the damper (4) to set the throat
The size of the primary air port can be adjusted by adjusting the relative positional relationship in the circumferential direction with respect to 0).

A first cylindrical portion (20a) has an upper end which will be described later.
A metal (about 0.2 mm) holding plate (7) for holding the thermocouple (6a) is attached by a screw (7a) in a substantially horizontal posture. The holding plate (7) protrudes outward from the throat (20), and its tip is a curved portion (71) curved to a circular cross section. The first thermocouple (6a) is accommodated in the curved portion (71) in a contact state. The first thermocouple (6a) is configured to detect the temperature of the curved portion (71) and output an electromotive force corresponding to the temperature.
(6a) is connected to a control circuit (5) described later. Note that the curved portion (71) is at a predetermined distance (5 to 1) with respect to the throat portion (20).
(About 0 mm).

Further, a long hole (42) of a predetermined length extending in the circumferential direction is formed in a peripheral wall of the damper (4), and the screw (7a) of the screw (7a) is formed in the long hole (42). The shaft (78) is inserted. Therefore, with the screw (7a) loosened, the damper (4)
After adjusting the size of the primary air port, the screw (7a) is tightened again, so that the damper (4) and the holding plate (7) are connected to the throat portion ( It becomes a state fixed to 20).

The throat section (28) having a suction function similar to that described above in a certain range from the upstream end of the second mixing pipe (2b).
The first nozzle (3a) is coaxially arranged in the throat (28). * Other Configurations * In the casing (10), the first burner head (1a) is arranged at a position near the outer periphery with respect to the first burner head (1a).
An ignition device (14) of a spark ignition type for igniting is provided. The ignition device (14) may be a pilot ignition type or a ceramic heater ignition type.

An operation switch (15) for instructing the first and second burner heads (1a) and (1b) to perform an ignition operation and a fire extinguishing operation is provided on a front surface of the casing (10). Furthermore,
In the casing (10), a control circuit (5) for controlling the ignition operation and the protection operation in the event of an abnormality is arranged. The control circuit (5) includes a microcomputer (5a), and the microcomputer (5a) stores a control program for executing the control.

[Use of Table Stove (1)] FIG. 4 is a flowchart of a control program stored in the microcomputer (5a) of FIG. Hereinafter, the use of the table stove (1) will be described with reference to FIG.
In this case, when the operation switch (15) is turned on, the first and second gas plugs (33) and (34) are opened (steps (S81) and (S82)). Thereby, the first and second nozzles (3
a) Gas is ejected from each of (3b). The jetted gas is sucked together with the primary air in the throat section (20) of the first mixing pipe (2a) and the throat section (28) of the second mixing pipe (2b).

Then, the gas sucked in the throat section (20) and the primary air are mixed in the first mixing pipe (2a). The mixed gas is supplied to the first burner head (1a),
It is ejected from the flame holes (11) (11). In addition, throat part (28)
The gas and the primary air sucked in are mixed in the second mixing pipe (2b), the mixed gas is supplied to the second burner head (1b), and the flame holes (12) and (12) It is gushing.

On the other hand, immediately after the opening of the first and second gas plugs (33) and (34), the ignition device (14) is operated for 5 seconds (step (S83)). As a result, the mixture gas ejected from the flame holes (11) and (11) of the first burner head (1a) is ignited.
Then, the flame generated by the ignition in the first burner head (1a) ignites into the gas mixture ejected from the flame holes (12) and (12) of the second burner head (1b), and the second burner head (1 Even 1b) is ignited. Thus, the first and second burner heads (1a) (1
Both b) are in a combustion state. In addition, a pan or the like (not shown) is arranged above the first and second burner heads (1a) and (1b).
The food such as the pan is heated by the combustion.

During the combustion, when the flame of the first and second burner heads (1a) and (1b) is extinguished (extinguish) due to wind or the like, the mixed gas is not burned from the flame holes (11) and (12). Although the temperature of the second burner head (1b) decreases due to the disappearance, the value of the electromotive force of the second thermocouple (6b) (second
The electromotive force value (62)) decreases. Then, when the second electromotive force value (62) becomes equal to or less than the second set value (64) set in advance, the first and second gas plugs (33) and (34) are closed (step).
(S85)). Thereby, the first mixing pipe is connected from the first nozzle (3a).
The gas supply to (2a) and the gas supply from the second nozzle (3b) to the second mixing pipe (2b) are stopped, and the mixed gas in the first and second burner heads (1a) and (1b) is stopped. The eruption ends. Therefore, the ejection at the time of the disappearance is suppressed.

During the combustion, when the flame holes (11) and (11) of the first burner head (1a) are clogged due to boiling over from the pot or the like, the first mixing pipe is passed from the first nozzle (3a). The gas supplied to (2a) increases the pressure of the mixed gas in the first mixing pipe (2a). As a result, the throat portion (2
The gas is hardly sucked in 0), and the gas overflows from the throat portion (20). It should be noted that the gas overflows from the throat section (20) even when the throat section (20) is clogged with foreign matter or when the gas ejection amount from the first nozzle (3a) becomes excessive. The gas overflowing from the throat portion (20) becomes a high-concentration gas that is hardly mixed with air.

At this time, since the second burner head (1b) independent of the first burner head (1a) is in the above-described combustion state, the gas overflowing from the throat section (20) is discharged to the second burner head (1a).
When reaching the burner head (1b), the second burner head (1b)
Ignition due to the flame of combustion at Even if the gas overflowing from the throat section (20) reaches the first burner head (1a), it is ignited by its heat.

Since the curved portion (71) of the holding plate (7) is arranged at a position near the upper portion of the opening (21) of the throat portion (20), the throat portion (20) is ignited by the ignition. The flame extending outward from the contact portion comes into contact with the curved portion (71). Thereby, the first thermocouple (6a) held by the bending portion (71) is heated. Although the flame from the throat portion (20) tends to extend upward, the holding plate (7) connected to the upper end of the throat portion (20) is substantially horizontal. The flame comes into contact with the main part of 7). The heat of the flame is conducted to the curved portion (71) via the main portion, and the first thermocouple (6a) is heated. In this case, since the heat of the flame is efficiently conducted to the first thermocouple (6a) via the holding plate (7), temperature detection by the first thermocouple (6a) is ensured.

By the heating of the first thermocouple (6a), the value of the electromotive force (first electromotive force value (61)) of the first thermocouple (6a) increases. Then, when the first electromotive force value (61) reaches a preset first set value (63), the first gas plug (33) and the second gas plug (34) are closed (step (S84)). By closing the first gas stopper (33), the first nozzle (3a)
The gas supply to the mixing pipe (2a) is stopped, whereby the overflow of the gas from the throat section (20) ends. Therefore,
The combustion of the high-concentration gas in the casing (10) ends. In addition, the second nozzle (3) is closed by closing the second gas stopper (34).
The gas supply from b) to the second mixing pipe (2b) is stopped, whereby the combustion in the second burner head (1b) ends.

The above steps (S84) and (S85) are repeatedly executed until the operation switch (15) is turned off, and the operation switch (15) is turned off without any abnormality as described above. When turned off, the first gas stopper (33) and the second gas stopper (34)
Is closed. By this valve closing, the combustion in the first and second burner heads (1a) and (1b) ends. In this case, the fact that the gas has overflowed from the throat section (20) is detected by the first thermocouple (6a) and the step (S84), and the steps (S84) and (S85) and the first gas plug According to (33), the first nozzle
Since gas supply from (3a) to the first mixing pipe (2a) is stopped, overflow of gas from the throat (20) is suppressed. Thereby, the continuation of the combustion of the gas is suppressed,
Damage to equipment in the casing (10) due to the continuation is suppressed.

Then, the fact that the gas overflows from the throat portion (20) is detected as the occurrence of combustion of the high-concentration gas in the casing (10), that is, the temperature near the throat portion (20). The configuration for detecting the overflow of gas from the throat section (20) is simplified. In this case, the table stove (1) is the "gas appliance" according to claims 1 and 7, and includes the first gas supply path (31), the first gas tap (33) and the first gas plug (33). The nozzle (3a) is a "gas supply means" according to claims 1 and 7, and the throat section (20) is a "throat section" according to claims 1, 2, 4 to 7. Yes,
The holding plate (7) is a "flame receiving plate" according to claims 5 and 6.

The above-mentioned first thermocouple (6a) is the same as the above-mentioned fourth embodiment.
And the first thermocouple (6).
The step (a) and the step (S84) correspond to the "combustion detecting means" described in claims 2 and 7, and the "detecting means" described in claim 1 described above. Further, the control program including the above steps (S84) and (S87) corresponds to the "control means" according to claims 1 and 7 described above. [Other embodiments]. In the above-described embodiment, the fact that the gas has overflowed from the throat portion (20) is detected as the occurrence of the combustion of the gas, but as long as the fact is detected, the occurrence of the combustion is detected. It is not limited to. For example, the above-mentioned fact is indicated by the pressure (static pressure) of the mixed gas in the first mixing pipe (2a).
May be detected as having reached a predetermined pressure.

In this case, a pressure sensor (not shown) for detecting the pressure is arranged in the first mixing pipe (2a), and the output value of this pressure sensor is higher than the normal value when there is no overflow. When the predetermined value is reached, the first gas tap (33) may be closed by the control program stored in the microcomputer (5a). In this case, the pressure sensor and the step of judging that the predetermined value in the control program has been reached are referred to as “pressure detecting means” according to claim 4 and as described in claim 1. Corresponds to “detection means”.

[0041] The "temperature detecting means" is not limited to the above-described thermocouple, but may be, for example, a bimetal-type temperature switch, a melting-type temperature fuse, or a thermistor. Further, the above-mentioned "combustion detecting means" does not have to detect the combustion temperature of the gas overflowing from the throat portion (20). For example, a sensor that detects infrared rays generated by the combustion in the throat portion (20) and its vicinity (by a light sensor or the like) may be used.

Further, the first thermocouple (6a) is arranged near the throat portion (20), but as long as it detects the temperature of the combustion of the gas overflowing from the throat portion (20), It may be arranged in the throat part (20). . The above-mentioned "gas appliance" is not limited to the above-described parent-child burner type table stove (1), but may be a table stove provided with a single burner. Moreover, you may implement in a water heater or a water heater.

[Brief description of the drawings]

FIG. 1 is a table stove according to an embodiment of the present invention.
Plan view of (1)

FIG. 2 is a sectional view of a main part of the first mixing pipe (2a) and the first nozzle (3a) of FIG. 1 as viewed from a side.

FIG. 3 is a plan view of a throat part (20) in FIG. 2;

FIG. 4 is a flowchart of a control program stored in the microcomputer (5a) of FIG. 1;

FIG. 5 is an explanatory view of a conventional table stove (1).

[Explanation of symbols]

 (1) ・ ・ ・ Table stove (3a) ・ ・ ・ First nozzle (3a) (31) ・ ・ ・ First gas supply path (33) ・ ・ ・ First gas stopper (20) ・ ・ ・ Throat part ( 7) ... holding plate (6a) ... first thermocouple (5) ... control circuit (5a) ... microcomputer

Claims (7)

[Claims] 1. A gas supply means for supplying gas in a jet state, and a throat portion formed at an upstream end of a mixing pipe reaching a burner head and sucking the gas in the jet state together with primary air. A protection device for a gas appliance used for a gas appliance, wherein the detection device detects that gas has overflowed from the throat portion, and the gas supply device is deactivated in response to a detection output of the detection device. A control device for a gas appliance, comprising: a control unit. 2. The combustion engine according to claim 1, wherein the detection unit includes a combustion detection unit configured to detect combustion of the gas overflowing from the throat unit.
The protection device for a gas appliance according to claim 1, wherein the control unit deactivates the gas supply unit in response to a detection output of the combustion detection unit. 3. The apparatus according to claim 2, wherein the detecting means includes a pressure detecting means for detecting that the pressure in the mixing pipe has reached a predetermined pressure, and the control means responds to a detection output of the pressure detecting means to supply the gas. The protection device for a gas appliance according to claim 1, wherein the means is deactivated. 4. The protection device for a gas appliance according to claim 2, wherein the combustion detecting means includes a temperature detecting means disposed at or near the throat portion and detecting a temperature of the combustion. 5. The gas appliance protection device according to claim 4, wherein the temperature detecting means is mounted on a flame receiving plate arranged so that a flame extending outward from the throat portion due to the occurrence of the combustion comes into contact with the flame receiving plate. 6. The throat portion is formed in a substantially tapered shape in which at least a part of an inner surface is reduced in diameter in an inward direction, and is disposed so that an axis is substantially horizontal. 6. The gas appliance protection device according to claim 5, wherein the gas appliance protection device is connected in a substantially horizontal posture to a position near an upper portion of an outer opening of the portion. 7. A gas comprising: gas supply means for supplying gas in a jet state; and a throat section for sucking the gas in the jet state together with primary air at an upstream end of a mixing pipe reaching a burner head. An appliance, comprising: combustion detection means for detecting the generation of combustion of gas overflowing from the throat portion; and control means for deactivating the gas supply means in response to a detection output of the combustion detection means. Gas appliances.