JPH11230621A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the entry of water from an exhaust part into a casing without the great complication of a strcuture by using an existing structure provided in a combustion device. SOLUTION: A combustion device comprises in a casing 18 a burner 3 and a ventilating means 4 for performing a ventilating operation to exhaust outside the combustion exhaust gas of the burner 3 from an exhaust part A opened in the casing 18. A precipitation sensor 19 is provided for detecting a precipitating state that water precipitates on the casing 18. A control means is provided for controlling the operation of the ventilating means 4 so as to perform the ventilating operation when the precipitating state is detected by the precipitation sensor 19 under a state in which the combustion operation of the burner 3 is not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a casing,
The present invention relates to a combustion device provided with a burner and ventilation means for performing ventilation operation for exhausting combustion exhaust gas of the burner from an exhaust portion opened to a casing to the outside.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned combustion apparatus is provided with a rain sensor for detecting rainfall, as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-221714. The eaves member (exhaust opening ratio variable part 10) that covers the upper part of the opening and swings openably and closably opens, and when rainfall is detected, the eaves member is closed by a solenoid and controlled to reduce the opening. was there.

[0003]

According to the above-mentioned conventional structure, when rain is not falling, the exhaust portion is opened wide to reduce exhaust noise when exhausting combustion exhaust gas, and when rain is falling, Although the opening is made small to prevent rain from entering the inside, in this conventional configuration, a dedicated actuator for opening and closing the eaves member is required, and the configuration is accordingly complicated. In addition to the disadvantage that the cost is high, simply reducing the size of the opening of the exhaust portion, taking into account the soaring due to the wind, etc.
It was still not enough to prevent rainwater from entering the interior.

The present invention has been made in view of such a point, and an object of the present invention is to use an existing configuration provided in a combustion apparatus and to reduce the complexity of the structure without significantly increasing the structure of the exhaust unit. It is an object of the present invention to provide a combustion device that can prevent water from entering the inside of a casing.

[0005]

According to the first aspect of the present invention, a burner is provided in the casing, and a ventilation operation for exhausting combustion exhaust gas from the burner to the outside through an exhaust portion opened in the casing is performed. In a combustion device provided with a ventilation means, a rainfall state detection means for detecting whether or not a rainfall state in which water is falling on the casing, and a rainfall state detection in a state in which the burner combustion operation is not performed. And control means for controlling the operation of the ventilation means so as to execute the ventilation operation when the means detects a precipitation condition.

That is, when the burner is performing a combustion operation, the ventilation means performs a ventilation operation to exhaust the combustion exhaust gas. Then, when precipitation is detected by the precipitation state detecting means when the burner is not performing the combustion operation, the operation of the ventilation means is controlled by the control means so as to execute the ventilation operation.

[0007] As a result, the burner is performing a combustion operation by using the existing ventilation means in this type of combustion apparatus without complicating the structure such as opening and closing a shielding member by an actuator. Irrespective of whether or not it is raining, even if water such as rain is falling, the ventilation operation by the ventilation means prevents water from entering the casing through the exhaust part, and for example, the water starts falling on the burner and the combustion operation It has become possible to provide a combustion device capable of reliably preventing inconveniences such as causing a defect and corroding a burner due to harmful substances contained in rainwater.

[0008] According to a second aspect of the present invention, in the first aspect, the control unit detects the precipitation state by the precipitation state detection unit and executes a ventilation operation, and then executes the ventilation operation. Since it is configured to stop the ventilation operation when it is not detected, for example, when the precipitation state is detected, the ventilation operation is continued or the ventilation operation is started while the set time elapses. It is conceivable that the operation is stopped by a manual operation command after the operation has been performed, but compared to such a configuration, the ventilation operation is performed in a state where there is no disadvantage such as performing the ventilation operation unnecessarily long. Start and stop are executed at appropriate timing.

According to a third aspect of the present invention, in the first or second aspect, a hot water supply heat exchanger heated by the burner is provided between the burner and the exhaust portion.

[0010] The hot water supply heat exchanger is provided at a position closer to the exhaust portion than the burner. However, it is possible to prevent water from flowing down from the exhaust portion to such a heat exchanger, and to perform heat exchange. Inconveniences such as the vessel being corroded by harmful substances contained in rainwater can be avoided.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the control means is configured to control a burning operation of the burner, and to execute a burning operation of the burner. Is configured to control the operation of the ventilation means to execute the ventilation operation.

Therefore, the control means is configured to control the ventilation operation of the ventilation means at the time of rain by utilizing the control configuration for controlling the combustion operation of the burner and the ventilation operation at that time. By using the existing configuration, the configuration is not complicated, such as providing a dedicated control means at the time of rain.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the exhaust portion is provided at an upper portion of the casing and exhausts the combustion exhaust gas to the side. Since it is configured as described above, for example, it is easier to take measures to prevent rainwater or the like falling down from entering through the exhaust unit, compared to a configuration provided on the upper surface of the casing, and to prevent water from entering by ventilation. It can be done effectively.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where a combustion apparatus according to the present invention is applied to a hot water supply apparatus will be described below with reference to the drawings. As shown in FIG. 1, the hot water supply apparatus includes a hot water supply unit K for heating supplied water to supply hot water, a control unit H for controlling the operation of the hot water supply unit K, and a remote controller for instructing the control unit H to issue control information. It is configured to include an operation unit R and the like. Hot water supply unit K
Is provided with a heat exchanger 2 for hot water supply in a combustion chamber 1 and a gas-fired burner 3 for heating the heat exchanger 2. A fan 4 is provided as ventilation means for ventilating the air to the outside through the exhaust part A. The heat exchanger 2
Is connected to a water supply passage 5 to which water is supplied and a hot water supply passage 6 for supplying hot water after being heated to an external hot water tap. The hot water supply amount sensor 7 and the incoming water temperature thermistor 8 for detecting the incoming water temperature are provided respectively. A fuel supply passage 10 for supplying fuel (gas) to the burner 3 is provided with an electromagnetically operated on-off valve 11 and an electromagnetic proportional valve 12 for adjusting the flow rate. There is provided an igniter 13 for igniting and a frame rod 14 for confirming ignition.

The remote control operation unit R includes an operation switch 15 for instructing the operation of the hot water supply unit K to be turned on and off, a display unit 17 for displaying a target hot water supply temperature and the like, and a temperature setting switch 16 for switching and setting the target hot water supply temperature and the like. And the like, so that information can be communicated with the control unit H.

The control section H is provided with a microcomputer and is configured to control the operation of the hot water supply section K based on a command from the remote control operation section R. Specifically, after the ON command of the operation switch 15 is given, when the hot-water tap is opened and the flow rate sensor 7 detects the flow of water equal to or more than the set amount, the combustion operation of the burner 3 is started. At the same time, the ventilation operation by the fan 4 is started. In other words, the fan 4 starts ventilation with the amount of ventilation for ignition, opens the on-off valve 11 and the electromagnetic proportional valve 12 in the open state for ignition, supplies fuel to the burner 3, and supplies the fuel to the igniter 13. Start the ignition operation and set the flame rod 1
When the ignition is confirmed in step 4, the ignition operation is stopped. When the combustion operation of the burner 3 is started in this way, the combustion exhaust gas of the burner 3 is discharged to the outside from the exhaust portion A by the ventilation operation of the fan 4.

Thereafter, based on the target hot water supply temperature, the detected value of the incoming water temperature thermistor 8, the detected value of the outgoing water temperature thermistor 9, and the detected value of the water flow rate sensor 7, which are instructed by the remote controller R, the hot water supply is performed. So that the temperature reaches the target hot water supply temperature,
The adjustment state (specifically, the current supply amount) corresponding to the required combustion amount of the burner 3 is calculated, the fuel supply amount is changed and adjusted by the electromagnetic proportional valve 12, and an appropriate air-fuel ratio is obtained according to the fuel supply amount. Thus, the amount of air flow by the fan 4 is controlled.
In this way, hot water of the target hot water supply temperature is supplied from the hot water tap.

When the hot-water tap is closed and the water flow rate falls below the set water flow rate, the fuel supply to the burner 3 is stopped to stop the combustion operation of the burner 3, and the ventilation operation by the fan 4 is stopped. The hot water supply standby state waits for the hot water tapping operation.

As shown in FIGS. 2 and 3, the hot water supply unit K is covered with a casing 18 and is fixedly installed on an outer wall of a building or the like. The fan 4 is disposed at a lower portion in the casing 18, and the fan 4 takes in outside air from an outside air intake portion B formed on a lower side of the casing 18.
The combustion air is passed through the burner 3, and the combustion exhaust gas is discharged laterally outward through an exhaust portion A formed on the upper side of the casing 18.

As shown in FIG. 2, on the upper surface of the casing 18, there is provided a precipitation sensor 19 as a precipitation condition detecting means for detecting whether or not the casing 18 is in a precipitation condition. The detection information of the precipitation sensor 19 is input to the control unit H, and the control unit H executes the burner 3 combustion operation performed in accordance with the water flow detection as described above. When the precipitation sensor 19 detects the precipitation state in the absence state, the operation of the fan 4 is controlled to perform the ventilation operation. As shown in FIG. 4, the precipitation sensor 19 has an electrode 21 formed on a surface of a water receiving surface 20,
When water falls on the water receiving surface 20, the impedance between the electrodes changes, so that it is configured as a so-called moisture detection type sensor that can detect whether or not it is in a rain state. The precipitation sensor 19 has a heater 2 inside.
2 is provided so that even when snow is falling in a cold region or the like, the snow can be melted to detect precipitation.

As shown in FIG. 5, after the turning-on of the hot-water tap and the detection value Qx of the water flow rate sensor 7 exceeds the set quantity Qs, the control section H sets As described above, the burner 3 is ignited, and the combustion state of the burner 3 is controlled so that hot water at the target hot water supply temperature is supplied, and the hot water supply operation state is provided in which the ventilation operation by the fan 4 is controlled (steps 1, 2, and 3). 3). The water flow sensor 7
When the detected value Qx is less than the set amount Qs, the combustion operation of the burner 3 is stopped, the ventilation operation is stopped, and the operation enters a standby state (step 6). When the precipitation sensor 19 detects the precipitation state in the driving standby state,
The ventilation operation by the fan 4 is started (step 4,
5). At this time, the ventilation by the fan 4 is performed at the maximum capacity so that intrusion of rainwater or the like from the exhaust part A can be avoided as much as possible. As soon as the precipitation state is no longer detected, the ventilation operation is stopped and the operation returns to the operation standby state (steps 5 and 6).

[Another Embodiment] (1) In the above embodiment, after the ventilation operation is started in accordance with the detection of the precipitation, if the precipitation is no longer detected, immediately.
Although the ventilation operation is stopped, the invention is not limited to such a configuration.After the ventilation operation is started, the ventilation operation may be stopped by a manual operation, or the ventilation operation may be continued until a set time elapses. The configuration may be any.

(2) In the above embodiment, the ventilation operation is performed with the maximum ventilation capacity by the ventilation means in accordance with the detection of precipitation, but instead of such a configuration, for example, a precipitation sensor and a wind sensor A wind sensor or the like for detecting the intensity of the wind may be provided to appropriately change the ventilation capacity of the ventilation means according to the strength of the wind.

(3) In the above embodiment, the control section as the control means controls both the combustion operation of the burner and the ventilation operation of the ventilation means. However, the control of the ventilation means accompanying the detection of the precipitation sensor is performed. The control means to perform may be provided separately from the control means for hot water supply combustion.

(4) In the above embodiment, the case where the precipitation sensor is of the moisture detection type has been exemplified. However, the present invention is not limited to this, and an infrared sensor may be used.

(5) In the above embodiment, the case of a hot water supply device is described as an example of a combustion device. However, the present invention is not limited to a hot water supply device, and the present invention can be applied to a heating combustion device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater.

FIG. 2 is a side view of a hot water supply unit.

FIG. 3 is a front view of a hot water supply unit.

FIG. 4 shows a precipitation sensor.

FIG. 5 is a control flowchart.

[Explanation of symbols]

 2 Heat exchanger 3 Burner 4 Ventilation means 18 Casing 19 Precipitation detection means A Exhaust part H Control means

Claims (5)

[Claims] 1. A combustion apparatus comprising: a casing, a burner, and ventilation means for performing ventilation to exhaust combustion exhaust gas from the burner from an exhaust portion opened to the casing to the outside. Precipitation state detection means for detecting whether or not it is a rain state where water is falling, and the precipitation state detection means detects that the precipitation state is in a state where the combustion operation of the burner is not executed. Then, a control unit for controlling the operation of the ventilation unit is provided to execute the ventilation operation. 2. The control means executes the ventilation operation after the precipitation state detection means detects the precipitation state and executes the ventilation operation. Then, the control means performs the ventilation operation when the precipitation state is not detected. The combustion device according to claim 1, wherein the combustion device is configured to stop. 3. The combustion apparatus according to claim 1, wherein a hot-water supply heat exchanger heated by the burner is provided between the burner and the exhaust unit. 4. The control means is configured to control a combustion operation of the burner, and when performing a combustion operation of the burner, controls the operation of the ventilation means to perform the ventilation operation. The combustion device according to any one of claims 1 to 3, wherein the combustion device is configured as follows. 5. The exhaust unit according to claim 1, wherein the exhaust unit is provided at an upper portion of the casing, and configured to exhaust the combustion exhaust gas toward a side. Combustion equipment.