JP2010133580A - Open type burning appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open type burning appliance suppressing adhesion of foreign matters on a gas sensing part. <P>SOLUTION: The open type burning appliance 100 is provided with: a combustion part 1 for burning supplied fuel; an air blowing part 6 for taking in outside air from an air supply port and sending the outside air to an outflow port via the combustion part 1; and the gas sensing part 20 sensing either one of or both of combustible gas and carbon monoxide gas. The gas sensing part 20 is stored within a casing 24 with a window 23 and senses fluid intruding into the casing 24 through the window 23. The open type burning appliance 100 is further provided with a foreign matter adhesion suppressing means A for positioning a cover 25 in an opening position for opening the window 23 when the combustion part 1 is in the burned state, and for positioning the cover 25 in the closing position for closing the window 23 when the combustion part 1 is the unburned state, so as to suppress adhesion of foreign matters on the gas sensing part 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes any one of a combustion unit that burns supplied fuel, a blower unit that takes outside air from an air supply port and sends it to the outlet through the combustion unit, and a combustible gas and a carbon monoxide gas. The present invention relates to an open-type combustion apparatus including a gas detection unit that is sensitive to both.

  An open-type combustion device that burns fuel by a combustion unit includes a combustion unit, a blower unit, and the like housed in a casing. The blower unit takes outside air into the casing, and the taken outside air is used as combustion air in the combustion unit. Combustion gas combusted in the combustion section is discharged from the casing. As such an open-type combustion device, a hot water supply device that heats hot water by heat exchange with the combustion gas burned in the combustion section and supplies the hot water to a hot water supply location or the like, or the combustion gas is directly heated as heating air or the like. There are heaters etc. that discharge to places. In conventional open-type combustion equipment, in order to ensure safety, when flammable gas leaks, etc., the leakage of the flammable gas is detected, or carbon monoxide gas generated by incomplete combustion in the combustion section is detected. It is configured to include a gas detection unit that detects it. (See Patent Document 1).

JP 2001-65989 A

  The open combustion apparatus described above is configured such that, for example, a gas detection unit is provided in a passage or the like for flowing outside air taken into the casing, and fluid such as outside air taken into the casing is a detection target.

  Therefore, it is conceivable to provide a filter for removing foreign substances such as dust at an air supply port or the like for taking outside air into the casing. However, in this case, since the outside air taken into the casing is used as combustion air, it is necessary to ensure the amount of outside air inflow necessary for combustion. Will be provided. Therefore, foreign matter such as dust will enter the casing from this opening, etc., and foreign matter cannot be completely prevented from entering the casing. There is a risk of adhesion.

  This invention is made | formed in view of said subject, The objective is to provide the open type combustion apparatus which suppresses that a foreign material adheres to a gas detection part.

In order to achieve the above object, an open-type combustion apparatus according to the present invention includes a combustion unit that combusts supplied fuel, a blower unit that takes outside air from an air supply port and sends the outside air to the outlet through the combustion unit, A gas detector sensitive to either or both of combustible gas and carbon monoxide gas,
The characteristic configuration is that the gas detection unit is provided in a casing having a window portion that can be opened and closed by a cover portion, and is provided as a detection target for fluid entering the casing through the window portion, and the combustion portion is in a combustion state. The cover portion is positioned at an open position where the window portion is opened, and when the combustion portion is in a non-combustion state, the cover portion is positioned at a closed position where the window portion is closed, and the foreign matter is detected by the gas. It is in the point provided with the foreign substance adhesion suppression means which suppresses adhering to a part.

According to the above characteristic configuration, when the combustion part is in the combustion state, the cover part is positioned in the open position, the fluid outside the casing is taken into the casing through the window part, and the combustible gas or carbon monoxide gas is detected by the gas detection part. When the combustion part is in a non-combustion state, the cover part is positioned in the closed position so that the fluid containing the foreign substance does not enter the inside of the housing, and the foreign substance adheres to the gas detection part. Can be suppressed.
As a result, when it is not necessary for the gas detection unit to detect gas, such as when the combustion unit is in a non-combustion state, the gas detection unit is isolated from the external space, and foreign matter or the like adheres to the gas detection unit. It can suppress favorably and can suppress that the gas detection sensitivity of a gas detection part becomes dull.

  A further characteristic configuration of the open-type combustion apparatus according to the present invention is that a cover fixing means for maintaining the cover portion in the open position is provided when the combustion portion is in a combustion state.

  According to the above characteristic configuration, since the cover fixing means for maintaining the cover portion in the open position is provided, for example, when the combustion portion is in the combustion state, the cover portion is moved to the closed position due to malfunction or the like. Even if it tries, the cover part can be maintained in the open position by the cover fixing means. Therefore, even if malfunction occurs when the combustion part is in a combustion state, gas detection by the gas detection part can be continued, and the safety of the user can be ensured more appropriately.

An open-type combustion apparatus according to the present invention includes a combustion unit that combusts supplied fuel, a blower unit that takes outside air from an air supply port and sends the outside air to the outlet through the combustion unit, a combustible gas, and carbon monoxide. A gas detector that is sensitive to either or both of the gas,
The characteristic configuration is that a foreign matter adhesion suppressing unit that adsorbs foreign matters floating around the gas detection unit and suppresses the foreign matters from adhering to the gas detection unit is provided.

  According to the above characteristic configuration, the foreign matter adhesion suppressing means adsorbs and removes the foreign matter contained in the fluid around the gas detection unit, so that the foreign matter can be prevented from adhering to the gas detection unit. In particular, the foreign matter contained in the outside air adheres to the gas detector even if the foreign matter contained in the outside air is likely to adhere to the gas detector as the outside air taken in the casing as the detection target of the gas detector. Can be suppressed.

  A further characteristic configuration of the open-type combustion apparatus according to the present invention is such that a guide part that guides a fluid to be detected is provided in the gas detection part, and the gas detection part includes a guide part that guides the fluid to be detected. Also, the foreign matter adhesion suppressing means is provided in the upstream portion.

  According to the above characteristic configuration, the guide unit can appropriately guide the detection target fluid to the gas detection unit. And in the direction which the said fluid is guide | induced, while providing a foreign material adhesion suppression means in the site | part upstream from a gas detection part among guide parts, while being able to install a foreign material adhesion suppression means using a guide part In addition, foreign matter and the like can be adsorbed on the upstream side of the gas detection unit, and the foreign matter and the like can be accurately suppressed from being guided to the gas detection unit.

  A further characteristic configuration of the open-type combustion apparatus according to the present invention is that a casing for housing the combustion section and the blower section is provided, and a gas for supplying the fuel from the outside of the casing on the outer surface of the casing. The gas detection part and the foreign matter adhesion suppression means are provided on the surface provided with the gas connection port for connecting the flow pipe.

Since an open-type combustion device is used by connecting a gas flow pipe such as a rubber hose or a gas pipe to the gas connection port, for example, if a connection failure of the gas flow tube to the gas connection port occurs, combustible fuel or the like from the gas connection port There is a possibility of leakage of sex gases. Therefore, according to the above characteristic configuration, the gas detection part and the foreign matter adhesion suppressing means are provided on the surface of the casing where the gas connection port is provided, so that the combustible gas leaked from the gas connection port Can be detected relatively quickly in the initial stage of leakage.
Furthermore, if the gas detection unit and the foreign matter adhesion suppression means are arranged adjacent to the gas connection port, it is possible to more quickly detect leakage from the gas connection port where flammable gas is likely to leak. it can.

[First Embodiment]
As a first embodiment of the present invention, a basic configuration of a gas fan heater 100, which is an example of an open combustion apparatus, will be described with reference to FIGS.
As shown in FIG. 1, the gas fan heater 100 includes a combustion chamber 1 (an example of a combustion section) that burns supplied fuel G (such as city gas 13 </ b> A mainly composed of methane), and an outside air supply port 7. A fan 6 (an example of an air blowing unit) that takes in from the air and guides it to an outlet 9, a gas sensor 20 (an example of a gas detection unit) that detects flammable gas (for example, city gas), and an operation unit B that operates the gas fan heater 100 And a control device 18 that controls the operation of the gas fan heater 100 based on a signal from the operation unit B or the like.

The combustion chamber 1 is disposed inside a casing 13 that forms the outer wall surface of the fan heater 100, a gas supply pipe 2 that guides the fuel G from the outside, a burner 3 that burns an air-fuel mixture of the fuel G and outside air, An igniter 4 for igniting the burner 3 and a thermocouple 5 for detecting the temperature in the burner 3 are configured.
The casing 13 has an air supply port 7 on the back surface and a blowout port 9 (an example of an outflow port) on the front surface, and is configured to surround the entire fan heater 100. Inside, the outside air (air or the like) is formed. The outside air flow path 8 is provided so that a part of the air is introduced into the combustion chamber 1 as combustion air and the remaining part is mixed with the combustion gas discharged from the combustion chamber 1 and sent out from the blowout port 9. The air supply port 7 is provided with an air filter 17 for removing foreign substances and the like.

  The fan 6 is disposed in the middle of the outside air flow path 8, sucks outside air from the air supply port 7, distributes a part thereof through the combustion chamber 1, and discharges the remaining part and the combustion chamber 1. It functions to mix the combustion gas and guide it to the outlet 9.

  The gas sensor 20 includes a sensor unit 20a that detects leakage of combustible gas and a sensor substrate 20b that controls the sensor unit 20a. For example, a semiconductor type or an infrared absorption type is used.

  The gas sensor 20 is provided along with the rear surface of the outer surface of the casing 13 together with the foreign matter adhesion suppressing means A described later, and is embedded in the interior thereof. A plug 10 (an example of a gas connection port) connected to the connection joint 11 of the gas pipe 12 that guides the fuel G is provided on the back surface of the casing 13, and the gas sensor 20 is on the back surface of the same casing 13 as the plug 10. And it arrange | positions so that it may be located above the installation location of the plug 10. FIG. With such an arrangement, the gas sensor 20 exhibits a function of quickly detecting the leakage of the flammable gas when the connection of the connection joint 11 to the plug 10 is insufficient and the flammable gas leaks. When the gas sensor 20 detects the combustible gas and determines that the concentration is equal to or higher than the set value, the gas sensor 20 transmits an abnormality detection signal to the control device 18. When receiving the abnormality detection signal from the gas sensor 20, the control device 18 closes the on-off valve provided in the gas supply pipe 2 to stop the combustion of the burner 3, and then drives the fan 6 until the set time elapses. And an abnormality detection signal is transmitted to an abnormality notification panel 16 described later.

  The operation unit B includes an operation button 14 for transmitting an operation start signal and an operation stop signal for starting and stopping the fan heater 100 to the control device 18, a temperature setting button 15 for transmitting a signal related to the target temperature to the control device 18, and the control device 18. Is provided with an abnormality notification panel 16 that receives an abnormality detection signal of the fan heater 100 and displays information such as “abnormal gas leakage”.

  For example, when the operation start signal is received from the operation button 14, the control device 18 rotates the fan 6, opens the on-off valve (not shown) provided in the gas supply pipe 2, and burns the fuel G. 3, the igniter 4 is ignited to burn the burner 3, and an operation start signal is transmitted to the foreign matter adhesion suppressing means A described later. On the other hand, when the operation stop signal is received from the operation button 14, the rotational drive of the fan 6 is stopped, the on-off valve provided in the gas supply pipe 2 is closed, and the supply of the fuel G to the burner 3 is stopped. Then, an operation stop signal is transmitted to the foreign matter adhesion suppressing means A described later.

  Next, a characteristic configuration of the fan heater 100 as an open combustion apparatus according to the present invention will be described based on FIGS. 3 (a) and 3 (b).

  The gas sensor 20 is housed in a housing 24 having a window portion 23, and the sensor portion 20a is directed toward the window portion 23 so as to detect outside air entering the inside of the housing 24 through the window portion 23. At the same time, the sensor substrate 20 b is provided facing the opposite side of the window portion 23.

  The window 23 has an open position in which the window 23 can be opened to guide outside air into the housing 24, and a closed position in which the window 23 is closed and the inside of the housing 24 is isolated from the outside. A movable cover portion 25 is provided. The housing 24 is installed so that the surface on which the window portion 23 is provided is located on the same surface as the outer surface of the casing 13 of the fan heater 100. FIG. 3A shows a state where the cover portion 25 is located at the closed position, and FIG. 3B shows a state where the cover portion 25 is located at the open position.

A spring 26 is provided to urge the cover portion 25 from the open position to the closed position. And the cover part 25 has the uneven | corrugated shape which meshes with the gear 21a in the side part, and is comprised so that a movement between an open position and a closed position is possible by rotation of the gear 21a. The gear 21 a is configured to be capable of changing the rotation direction by a motor 21 b whose rotation direction can be switched by a control signal from the control device 18, and functions as the cover moving means 21.
Furthermore, the cover portion 25 is made of a member that can be fixed by a magnetic force, and as shown in FIG. 3B, when the cover portion 25 is in the open position for opening the window portion 23, the electromagnet 22 (an example of a cover fixing means) The cover portion 25 is configured to be maintained in the open position. The electromagnet 22 is installed on the outer surface of the casing 24 so as to be positioned between the cover section 25 and the casing 24 in a state where the cover section 25 is positioned at the open position.
Then, when the burner 3 of the combustion chamber 1 is in a combustion state, the three members of the casing 24, the cover portion 25, and the window portion 23 are arranged so that the cover portion 25 is moved to the window portion 23 as shown in FIG. When the burner 3 of the combustion chamber 1 is in the non-combustion state while being positioned at the open open position, foreign matter adheres by positioning the cover 25 at the closed position where the window 23 is closed as shown in FIG. It functions as the suppression means A.

The gas sensor 20 and the foreign matter adhesion suppressing means A described above are preferably provided on the surface of the outer surface of the casing 13 where the plug 10 is provided, and more preferably, the portion where the plug 10 is provided. It is preferable to be provided adjacent to. By arrange | positioning in this way, the gas sensor 20 can detect the combustible gas which leaked because the connection of the plug 10 and the connection coupling 11 is inadequate, and leaked.
In addition, when using city gas 13A as combustible gas which is the fuel G of the fan heater 100, the combustibility lighter than air is provided by providing the gas sensor 20 and the foreign material adhesion suppression means A above the installation site | part of the plug 10. FIG. The function to detect gas more accurately is demonstrated.

Next, the operation of the foreign matter adhesion suppressing means A will be described when the fan heater 100 takes both the operating state and the stopped state.
As described above, when the control device 18 receives the operation start signal from the operation button 14 of the operation unit B, the control device 18 transmits the operation start signal to each part of the fan heater 100 to bring the fan heater 100 into the operation state. Thus, an operation start signal is also transmitted to the motor 21b of the cover moving means 21. When receiving the operation start signal, the motor 21b rotates the gear 21a so as to move the cover portion 25 from the closed position to the open position, and shifts the cover portion 25 to the open state against the biasing force of the spring 26. Along with this, the control device 18 also transmits an operation start signal to the electromagnet 22, generates a magnetic force in the electromagnet 22, and maintains the cover portion 25 in the open state.
As a result, the outside air outside the housing 24 is guided around the gas sensor 20 provided inside the housing 24, so that the gas sensor 20 has a combustible gas in the outside air outside the housing 24. The ability to detect well contained can be demonstrated.
On the other hand, when the control device 18 receives the operation stop signal from the operation button 14 of the operation unit B, the control device 18 transmits the operation stop signal to each part of the fan heater 100 to bring the fan heater 100 into the operation state. In addition, an operation stop signal is transmitted to stop the generation of magnetic force by the electromagnet 22 and keep the cover portion 25 closed. Further, the control device 18 transmits an operation stop signal to the motor 21 b of the cover moving means 21. When the motor unit 21b receives the operation stop signal, the motor unit 21b rotates the gear 21a to move the cover unit 25 from the open position to the closed position, and moves the cover unit 25 to the closed position.
Thereby, when the fan heater 100 is in a stopped state, that is, when the burner 3 of the combustion chamber 1 is in a non-combustion state and the possibility of occurrence of leakage of combustible gas is extremely low, the foreign matter adhesion suppressing means A is The gas sensor 20 installed inside the housing 24 is isolated from the outside air outside the housing 24 to suppress the movement of foreign matter around the gas sensor 20 and the foreign matter adheres to the gas sensor 20 to reduce sensitivity. Demonstrate the ability to prevent.
Note that the fan heater 100 of the present invention is not used for a long period of time in summer or the like, and maintains the cover 25 in the closed state even in a situation where dust tends to accumulate on the gas sensor 20. The gas sensor 20 has a function of preventing dust from accumulating favorably.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, about the structure same as 1st Embodiment, the same name and code | symbol shall be attached | subjected and the description may be omitted.
In 2nd Embodiment, the guide part 31 which surrounds the sensor part 20a of the gas sensor 20, and guides the external air of a detection target to the sensor part 20a is provided, and the sensor part 20a among the guide parts 31 in the direction in which the said external air is guide | induced. In addition, a charging unit 32 that adsorbs foreign matters contained in the outside air is provided at the upstream side. The charging unit 32 is made of a member that can be charged with static electricity, and is configured to adsorb foreign matter when the static electricity is supplied from the static electricity generator 30.
Then, the guide unit 31 guides the outside air to be detected to the sensor unit 20a, and the charged unit 32 in a charged state suppresses the foreign matter from adhering to the sensor unit 20a in a form that adsorbs the foreign matter from the outside air. It functions as the foreign matter adhesion suppression means A.

  As shown in FIG. 4, the guide portion 31 is formed of a tubular cylinder that surrounds the sensor portion 20a. In the direction of guiding the outside air, the upstream opening portion opens downward. It is preferable to make it a shape. Thereby, combustible gas, such as methane which has a specific gravity smaller than air | atmosphere and moves upwards, can be favorably guided to the sensor unit 20a. Further, the foreign matter adsorbed when the charging unit 32 is in a charged state can be dropped by its own weight when the charging unit 32 is in an uncharged state, and can be moved away from the sensor unit 20a.

Next, the operation of the foreign matter adhesion suppression unit A when the fan heater 100 according to the second embodiment is switched between the operating state and the stopped state will be described.
When the control device 18 receives an operation start signal from the operation button 14 of the operation unit B, the operation start signal is transmitted to each part of the fan heater 100 to move to the operation state, and the static electricity generator 30 is also operated. Send a start signal. The static electricity generator 30 sends the generated static electricity to the charging unit 32. Thereby, since the foreign material contained in the detection target outside air guided to the sensor unit 20a is adsorbed by the charging unit 32 in a charged state, the foreign material can be prevented from moving toward the sensor unit 20a. According to the present embodiment, in particular, the foreign matter moving toward the sensor unit 20a can be accurately removed while guiding the outside air to be detected to the sensor unit 20a, whereby the foreign matter is transferred to the sensor unit 20a. It can suppress adhering.
On the other hand, when the control device 18 receives an operation stop signal from the operation button 14 of the operation unit B, the control device 18 transmits an operation stop signal to each part of the fan heater 100 and shifts to the stop state. Accordingly, the control device 18 transmits an operation stop signal to the static electricity generation device 30. The static electricity generator 30 stops the generation of static electricity and stops sending static electricity to the charging unit 32.

[Another embodiment]
(I)
The open combustion apparatus of the present invention is not limited to the fan heater 100, and may be a water heater or the like. In addition to city gas such as natural gas, kerosene and propane can be used as the fuel.

(B)
The foreign matter adhesion suppressing means A of the present invention may be configured to include both the configuration shown in the first embodiment and the configuration shown in the second embodiment. For example, it can be set as the structure by which the cover part 25 demonstrated in 1st Embodiment is provided with respect to the opening part of the guide part 31 of the cyclic | annular cylinder of 2nd Embodiment mentioned above.

(C)
In the first embodiment, when switching the fan heater 100 from the operating state to the stopped state, the control device 18 controls the motor 21b to rotate so that the cover portion 25 shifts from the open state to the closed state. It may be configured such that the rotation is simply stopped and the cover 25 is shifted from the open state to the closed state by the urging force of the spring 26.
Further, the gas sensor 20 is not necessarily housed in the housing, and may be configured by directly providing the hole 23 in the fan heater 100.

(D)
In the second embodiment, even when the fan heater 100 is in a stopped state, it may function so as to suppress the movement of foreign matter to the gas sensor 21. For example, when a foreign matter adhesion suppression switch (not shown) of the operation unit B is provided and the foreign matter adhesion suppression switch is in an ON state, the static electricity generator 30 generates static electricity and continues to supply the charging unit 32. It can be constituted as follows.

(E)
In the above embodiment, the gas sensor 20 detects the leakage of the flammable gas. However, the gas sensor 20 may separately detect another gas such as a carbon monoxide gas, or the flammable gas and the monoxide. What can detect both carbon gas may be sufficient.

  The open-type combustion device of the present invention can be effectively used as an open-type combustion device that suppresses foreign matter from adhering to the gas detector.

Schematic configuration diagram of the first embodiment of the present invention The block diagram of the control structure which concerns on 1st Embodiment of this invention. The schematic block diagram of the foreign material adhesion suppression means which concerns on 1st Embodiment of this invention. The schematic block diagram of the foreign material adhesion suppression means which concerns on 2nd Embodiment of this invention.

Explanation of symbols

1: Combustion chamber 3: Burner 4: Igniter 6: Fan 7: Air supply port 9: Air outlet 10: Plug 13: Casing 20: Gas sensor 21: Cover moving means 22: Electromagnet 23: Window 24: Housing 25: Cover Part 31: Guide part A: Foreign matter adhesion suppressing means 100: Fan heater

Claims (6)

A combustion section for burning the supplied fuel;
A blower unit that takes in outside air from the air supply port and sends it to the outlet through the combustion unit;
An open-type combustion device provided with a gas detector that is sensitive to either or both of combustible gas and carbon monoxide gas,
The gas detection unit is provided as a detection target for a fluid that is housed in a housing having a window portion that can be opened and closed by a cover portion and enters the housing through the window portion,
When the combustion part is in a combustion state, the cover part is located at an open position where the window part is opened, and when the combustion part is in a non-combustion state, the cover part is located at a closed position where the window part is closed. An open-type combustion device comprising foreign matter adhesion suppressing means for suppressing foreign matter from adhering to the gas detector.   The open-type combustion apparatus according to claim 1, further comprising a cover fixing unit that maintains the cover portion in the open position when the combustion portion is in a combustion state. A combustion section for burning the supplied fuel;
A blower unit that takes in outside air from the air supply port and sends it to the outlet through the combustion unit;
An open-type combustion device provided with a gas detector that is sensitive to either or both of combustible gas and carbon monoxide gas,
An open-type combustion apparatus comprising foreign matter adhesion suppression means that adsorbs foreign matter floating around the gas detection unit and suppresses the foreign matter from adhering to the gas detection unit. A guide unit for guiding a fluid to be detected to the gas detection unit is provided,
The open-type combustion apparatus according to claim 3, wherein the foreign matter adhesion suppressing means is provided in a portion of the guide portion upstream of the gas detection portion in the direction in which the fluid is guided.   A casing that houses the combustion section and the blower section is provided, and a gas connection port that connects a gas flow pipe for supplying the fuel from outside the casing is provided on the outer surface of the casing. The open-type combustion apparatus according to any one of claims 1 to 4, wherein the gas detection unit and the foreign matter adhesion suppressing unit are provided.   The open-type combustion apparatus according to claim 5, wherein the gas detection unit and the foreign matter adhesion suppression unit are disposed adjacent to the gas connection port.

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