JP2995316B2 - Gas combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustion apparatus such as a bath kettle or a water heater, and is intended to prevent an abnormal combustion state when the inside of an appliance is flooded by heavy rain or the like.

[0002]

2. Description of the Related Art For example, in the bath kettle shown in FIG. 1, a bathtub (T) and a heat exchanger (11) are composed of a pair of upper and lower bathtub pipes (S) (S)
A gas burner (2) for heating the heat exchanger (11) is provided below the heat exchanger (11). or,
The gas burner (2) is supplied with gas from a gas nozzle (21), and a combustion monitoring sensor (3) is provided near the upper part of the gas burner (2) to monitor the combustion state thereof.
Are arranged. Although a flame rod having a high response speed is usually used as the combustion monitoring sensor (3), a heat sensitive element such as a thermistor or a thermocouple may be used.

In this apparatus, when an operation switch (not shown) is operated to burn a gas burner (2), bath water in a bathtub (T) is supplied to a heat exchanger (11) through a bathtub pipe (S) (S). And the inside of the bathtub (T) is additionally heated. During this reheating, a gust was generated and the gas burner
When (2) blows out, etc., a gas valve (not shown) is closed by a signal from the combustion monitoring sensor (3) for detecting this state, and the supply of gas to the gas burner (2) is forcibly stopped. This prevents the raw gas from being released from the gas burner (2).

[0004] However, in the above-mentioned conventional apparatus, when the lower part of the apparatus main body (1) is flooded due to heavy rain or the like, there is a problem that a flame is not correctly formed on the combustion surface of the gas burner (2) and an abnormal combustion state is caused. The above problem will be described in more detail.
For example, when water is accumulated on the installation surface of the appliance body (1) due to heavy rain and cannot be drained, the gas nozzle (21) for supplying gas to the gas burner (2) is submerged in the water. As a result, the gas spouts irregularly from the water and burns while floating on the water surface, so that no flame is correctly formed on the combustion surface of the gas burner (2). Also, if the gas burner (2) is ignited after the lower part of the appliance body (1) is flooded, the gas jetted to the water surface will be ignited and proper combustion cannot be ensured as described above.

The present invention has been made in view of the above points, and has been made in consideration of a "gas nozzle (21) for supplying gas to a gas burner (2)".
A gas valve inserted into a gas circuit to the gas nozzle (21), and a combustion monitoring sensor (3) disposed near a combustion surface of the gas burner (2) and monitoring a combustion state of the gas burner (2).
And a gas combustion device having a gas valve control circuit for maintaining the gas valve open only when the combustion monitoring sensor (3) detects the combustion state of the gas burner (2). Another object of the present invention is to prevent an abnormal combustion state even when the inside of the appliance body (1) is flooded.

[0006]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is a non-waterproof connection between a signal line drawn from the combustion monitoring sensor (3) and a signal line connected to the gas valve control circuit. The connector (33) functions as a non-waterproof area, and a support is provided to support the connector (33) as the non-waterproof area at a position lower than the gas nozzle (21). "

[0007]

The above technical means operates as follows. The connector (33) functions as a non-waterproof area formed in the middle of a signal line from the combustion monitoring sensor (3) to the gas valve control circuit, and the connector (33) is a support tool for the gas nozzle (21).
As the water level on the installation surface of the instrument body (1) rises, the gas nozzle (21)
The connector (33) as the non-waterproof area is submerged before the submersion is submerged. Then, the electric signal from the combustion monitoring sensor (3) indicating that the gas burner (2) is in the combustion state leaks from the connector (33) of the signal line in the submerged state to the surrounding water and the gas valve control. It is not transmitted to the circuit. Then, the gas valve control circuit keeps the gas valve open only when a signal indicating that the gas burner (2) is in a combustion state (a signal from the combustion monitoring sensor (3)) is applied. Since the gas valve control circuit is configured, the gas valve control circuit cannot maintain the gas valve in the open state and closes the gas valve, thereby closing the gas valve (21) and the gas burner (2) on the downstream side. The gas supply is stopped and the gas burner (2) is maintained in a fire extinguishing state.

[0008]

The present invention has the following specific effects. Gas nozzle
Since the gas valve for supplying gas to (21) is closed before it is submerged, the gas nozzle (21) does not blow out gas into the water, and even if the inside of the instrument body (1) is flooded, Does not fall into abnormal combustion state.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The appliance body (1) is connected to the bathtub (T) via the bathtub pipes (S) (S) in the same manner as in FIG. 1 described above. FIG.
As shown in (1), the gas burner (2) is disposed in a combustion chamber (15) surrounded by a frame (13) located below the appliance body (1), and has a base end of the gas burner (2). A signal line (32) drawn from a combustion monitoring sensor (3) disposed above the section is connected to a male tool (331) constituting a non-waterproof connector (33). A signal line (35) drawn from the female member (332) of the connector (33) is connected to a gas valve control circuit (5), and the gas valve (4) is connected by the gas valve control circuit (5). Is controlled to open and close. In this embodiment, as the combustion monitoring sensor (3), a frame rod through which current flows when immersed in a flame is employed.

The connector (33) is fixed to the lower part of the instrument body (1) by a support (6), and the connector (33) is located below the gas nozzle (21) for supplying gas to the gas burner (2). positioned. The support (6) is formed by bending both ends of a metal strip downward to form legs (60) and (60), and the upper surface of the support (6) has a connector ( Engaging pieces (37) and (37) engaging with the upper surfaces of both sides of the (33) are provided so as to face each other, and the support (6) is further provided on the bottom wall (11) of the casing (12) of the instrument body (1). 16). When the connector (33) is fixed to the support (6), both ends of the connector (33) are brought into contact with the upper bent portions (370) (370) of the engagement pieces (37) (37). This bends the engagement pieces (37) and (37) in directions away from each other, thereby forcibly pushing the connector (33) downward. The signal line (32) drawn from the combustion monitoring sensor (3) is supported by a support rod (97) fixed with a screw (18) to a frame (13) constituting the peripheral side wall of the combustion chamber (15). Have been. That is, the signal line (83) is formed by a support (96) formed by bending the tip of a cord support rod (97) made of a metal wire into a ring shape.
It supports. In this embodiment, the support
Although the connector (33) is held at a predetermined position by (6), it is not always necessary to provide the support (6). In this case, the signal line (32) is connected between the combustion monitoring sensor (3) and the gas valve control circuit (5).
The arrangement position of the connector (33) suspended by (35) is positioned by only the support rod (97). In such a case, the support rod (97) alone determines the location of the connector (33). In this case, the support rod (97)
7) will function as the support described in the section of technical means. When the support (6) is provided as shown in FIG. 2, it is not always necessary to provide the support bar (97).

Next, the control circuit will be described. The gas valve control circuit (5) to which the combustion monitoring sensor (3) and the gas valve (4) are connected is configured as shown in FIG.
The current supplied from the combustion monitoring sensor (3) through (3) is configured to flow to the ground through fixed resistors (61) and (62). The output taken out between the fixed resistors (61) and (62) is applied to the comparison circuit (64) together with the output of the reference value setting circuit (65), and the output of the comparison circuit (64) is supplied to the ignition switch ( 7
The output of (1) is applied to the base of the transistor (68) via the OR circuit (67). A relay (R) for opening and closing the gas valve (4) is inserted in the collector circuit of the transistor (68).

Next, the actual operation of the bath kettle of the above embodiment will be described. When the ignition switch (71) is operated, the signal is applied to the transistor (68) via the OR circuit (67) and the transistor (68) is turned on, thereby exciting the relay (R) inserted in the collector circuit. As a result, the gas valve (4) is maintained in the open state, and the gas is supplied to the gas burner (2). Also, according to the operation signal of the ignition switch (71),
An ignition device (not shown) is operated to perform an ignition operation on the gas burner (2), and the gas burner (2) starts burning.

When the gas burner (2) burns, a current flows through the combustion monitoring sensor (3) → signal line (32) → connector (33) → signal line (35) → fixed resistance (61) (62), and The output taken from the middle point of the resistors (61) and (62) is applied to the comparison circuit (64). Then, an "H" signal is output from the comparison circuit (64), and this signal is applied to the transistor (68) via the OR circuit (67) so that the transistor (68) is maintained in the ON state. (4) is kept open and the combustion of the gas burner (2) continues.

When the gas burner (2) is burning, the lower part of the appliance body (1) is flooded and the connector
When the water level rises to the location of (33), the combustion monitoring sensor (3)
From the connector (33) leaks into the water and becomes grounded. Then, no current is supplied to the fixed resistors (61) and (62), an L signal is output from the comparison circuit (64), and the transistor (68) returns to the OFF state. As a result, the gas valve (4) returns to the closed state, and the gas burner (2) extinguishes. As described above, when the connector (33) is submerged in the water accumulated in the installation portion of the appliance body (1), the gas burner (2) is forcibly extinguished and a safe state is ensured.

In the above embodiment, a connector is provided in the middle of the signal lines (32) and (35) connecting the combustion monitoring sensor and the gas valve control circuit (5).
(33) is provided so that when the lower part of the instrument body (1) is immersed in water, the electric signal leaks from the connector (33) into the water, but the signal wires (32) and (35) are partially The non-waterproof area may be formed by forming minute holes to allow the electric signal to leak into the water from the part. In the above embodiment, a flame rod is used as the combustion monitoring sensor (3). However, a thermosensitive element such as a thermistor or a thermocouple may be used.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a setting state of a bath kettle.

FIG. 2 is a partially enlarged sectional view of an embodiment of the present invention.

FIG. 3 is an enlarged view of an arrangement portion of a connector (33).

FIG. 4 is a control circuit diagram of an embodiment of the present invention.

[Explanation of symbols]

 (1) ... instrument body (2) ... gas burner (3) ... combustion monitoring sensor (21) ... gas nozzle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23N 5/24

Claims (1)

(57) [Claims] 1. A gas nozzle (21) for supplying gas to a gas burner (2), a gas valve inserted into a gas circuit to the gas nozzle (21), and a gas valve disposed near a combustion surface of the gas burner (2). A combustion monitoring sensor that monitors the combustion state of the gas burner (2)
(3) and this combustion monitoring sensor (3)
In a gas combustion apparatus provided with a gas valve control circuit for maintaining the gas valve open only when the combustion state of the gas is detected, a signal line drawn from the combustion monitoring sensor (3) and the gas The non-waterproof connector (33) that connects the signal line connected to the valve control circuit functions as a non-waterproof area, and the connector (33) as the non-waterproof area is supported at a position lower than the gas nozzle (21). A gas combustion device provided with supports.