JP2006138586A - Gas cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cooking stove having a forced air-supply function without causing evil effect such as noise, vibration or increase of the size thereof. <P>SOLUTION: In this gas cooking stove, a needle-like electrode 24 is arranged, in addition to a fuel nozzle 41, in a fuel introduction port 621 of a combustion tube 62; the fuel introduction port is grounded to generate corona discharge by using it as a counter electrode of the needle-like electrode; and air is supplied into the combustion tube to supply it as primary air to gas from the fuel nozzle. A needle-like electrode 23 is installed at a lower position of an opening 611 of a doughnut ring-like burner head 61; corona discharge is generated by using the grounded opening as a counter electrode; and air is supplied into the opening from the lower side to the upper side and supplied to a combustion flame R as secondary air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gas stove provided with a corona discharge blower for blowing air using an air flow generated based on corona discharge.

  Conventionally, in a gas stove, combustion air (primary air, secondary air) necessary for combustion in a stove burner is usually configured to be taken in by natural suction or the like. For example, in the gas stove described in Patent Document 1, the burner top has a thick cylindrical shape, and the space extending in the vertical direction at the center position serves as an opening for taking in secondary air, while the inside of the cylinder portion surrounding the opening An annular space to which an air-fuel mixture is supplied is formed, and a flame opening is communicated with the annular space and opened to the outer peripheral side. The intake of the secondary air from the opening is not due to forced supply, but is mainly taken in as fuel gas is ejected from the flame port on the outer peripheral side and burned. Also, primary air to be mixed with fuel gas to form an air-fuel mixture is naturally sucked by ejecting fuel gas from the gas nozzle to the gas inlet.

  Moreover, as a gas stove, a gas stove constructed by integrating a grill part is also known (see, for example, Patent Document 2). Such a grill portion is configured such that in a state where a heating target such as a fish is accommodated therein, the heating target is combusted and heated downward or the like, and smoke or the like can be exhausted from the exhaust hood.

  On the other hand, since corona discharge can generate negative ions and ozone by this corona discharge, a negative ion generator for generating negative ions (for example, see Patent Document 3) or an ozone generator for diffusing ozone (for example, Patent Document 4). See).

JP-A-9-196324 JP 2001-336 A JP 2004-33875 A JP 2003-277023 A

  By the way, in recent years, an electric fan motor is also installed in the gas stove, and attempts to actively assist combustion by forcing the combustion air by driving the fan motor or commercializing it. Have been. It is also conceivable to improve heating efficiency by using forced air blowing by driving a fan motor.

  However, the mounting of the fan motor has the disadvantage that it not only increases the size of the gas stove itself, but also causes noise and vibration associated with the operation of the fan motor. In addition, since the fan motor mounted on the gas stove is required to have predetermined heat resistance and durability, the range of applicable fan motors is limited.

  The present invention has been made in view of such circumstances, and an object of the present invention is to obtain a forced air blowing function without causing adverse effects such as generation of noise and vibration and enlargement. It is to provide a gas stove that can be used.

  In order to achieve the above object, in the present invention, the gas stove includes a corona discharge blower that blows air using an airflow generated by corona discharge between the needle electrode and the counter electrode. ).

  In the case of the present invention, since the blowing is performed by the air flow generated based on the corona discharge, there is no generation of operating noise or vibration associated with the motor driving and the like, and the installation of the motor or the like is unnecessary, and the entire gas stove can be made compact. Is planned. Here, the “air flow generated by corona discharge” means that negative ions are generated by applying a voltage to a needle electrode, which will be described later, to generate a silent discharge corona discharge. It is the movement of air generated by being sucked, that is, an air flow.

  The following various things are mentioned as invention which materialized the technical thought which concerns on said invention more according to the difference in the ventilation objective.

  First, the corona discharge blower is provided with a combustion tube that supplies an air-fuel mixture to the flame port of the burner and a cylindrical fuel introduction port into which fuel is introduced at the upstream end of the combustion tube. An acicular electrode disposed so as to face and face the fuel introduction port, and a corona discharge between the acicular electrode and a cylindrical portion constituting the fuel introduction port as a counter electrode It is set as the structure which ventilates toward the downstream of this (claim 2). In this case, primary air is supplied to the fuel introduced into the fuel introduction port by forced air blowing by the corona discharge blower, and the mixed gas mixture is supplied to the flame port and burned. That is, the air blown by the corona discharge blower is used for the forced supply of primary air.

  Secondly, a blowout opening that opens toward the flame opening at a position near the flame opening of the burner, an air passage that communicates with the blow opening, a base end that communicates with the air passage, and a distal end that protrudes and opens. The corona discharge blower includes a needle electrode disposed so as to face and face the opening of the cylindrical portion, and the constituent member of the cylindrical portion is a counter electrode. It is set as the structure which blows in in the said air path by carrying out a corona discharge between needle-shaped electrodes (Claim 3). In this case, forced air blown by the corona discharge blower is blown from the outside to the air passage through the cylindrical portion, and the blown air is blown out as secondary air from the blowout port toward the combustion flame formed in the flame port. become. That is, the air blown by the corona discharge blower is used for the forced supply of secondary air.

  Thirdly, on the top plate around the stove burner, a blowout port formed so as to surround and open the flame outlet of the burner from the outer peripheral side, an air passage communicating with the blowout port, and the air passage And a corona discharge blower provided with a needle-like electrode disposed so as to face the opening of the tubular portion, the base end being communicated and the distal end protruding and opening. A configuration is adopted in which air is blown into the air passage by causing corona discharge between the cylindrical member and the needle electrode as a counter electrode. In this case, forced air blown by the corona discharge blower is blown from the outside to the air passage through the cylindrical portion, and the blown air is blown out as secondary air from the blowout port toward the combustion flame formed in the flame port. become. Since this blown out air travels along the top plate from its surroundings to the flame opening of the burner, it changes its direction upward after colliding with the combustion flame or its combustion gas, An air curtain surrounding the outer periphery of the combustion gas that surrounds the surface and forms an upward flow is formed. Thereby, the efficiency (heat efficiency) for the heating by a stove burner can be improved. That is, air blown by a corona discharge blower is used for forced supply of secondary air and formation of an air curtain for improving thermal efficiency.

  In the second or third invention for air blowing purposes, the air passage can be formed in an endless annular shape (claim 5). By doing in this way, the flow of the air based on the forced ventilation from a corona discharge blower turns into a swirl flow within an air passage, and is blown out with a swirl flow tendency from an outlet.

  Fourthly, a grill part and an exhaust passage that extends from the grill part to an exhaust port and exhausts smoke are provided. As the corona discharge blower, at least one end opening crosses the internal space of the exhaust passage. A portion comprising the tubular member disposed so as to extend to the outside of the exhaust passage and the needle-like electrode disposed so as to face the one end opening of the tubular member, and constituting the one end opening As a counter electrode, an airflow generated by corona discharge between the needle electrode and the needle electrode is discharged into the internal space of the exhaust passage. In this case, the air outside the exhaust passage is blown into the tubular member from the one end opening by forced air blow by the corona discharge blower, and the blown air is released into the exhaust passage. The release of air from the outside facilitates exhaust from the exhaust port of the exhaust gas in the exhaust passage. At the same time, a large amount of ozone is also generated during corona discharge by the corona discharge blower, and this ozone is carried in the air flow and released into the exhaust passage. This ozone discharges from the grill portion in the exhaust passage. Smoke will be deodorized. For this reason, it becomes possible to omit the need to install a deodorant for deodorizing smoke from the flue gas, and there is no need for inspection and replacement work to maintain the deodorization by the deodorant. The deodorizing function can be easily maintained over a long period of time. In other words, the air blown by the corona discharge blower is used for exhaust gas exhaust promotion and deodorization in the exhaust passage of the grill part.

  In the gas stove of each of the above inventions, the following specific items may be added selectively or in combination. That is, as a first specific matter, as the corona discharge blower, voltage application for causing corona discharge to the needle-like electrode is repeatedly turned ON / OFF alternately, and ON time and / or OFF occupying the repetition cycle. The air flow rate can be changed and adjusted by changing the time (claim 7). By changing and adjusting the discharge voltage itself applied to the needle-like electrode, the intensity (air flow rate) of airflow based on corona discharge may be changed and adjusted under continuous discharge, but it is smaller than the minimum side of voltage change. In order to adjust the change of the air flow rate in the range, intermittent discharge by alternating ON / OFF of the voltage application as described above is performed, and if the ON time and / or OFF time is changed, the transmission in the above small range is performed. The air volume can be changed and adjusted.

  As a second specific matter, as the corona discharge blower, another needle electrode is further provided, and an air flow based on corona discharge is generated in series and in multiple stages (claim 8). For example, a plurality of combinations of one counter electrode and one needle electrode are prepared and arranged in series and in multiple stages, or a plurality of needle electrodes in which another needle electrode is added to one counter electrode By arranging them in series and in multiple stages, corona discharge can be generated in multiple stages to increase the strength of the airflow (air flow rate). That is, in the ventilation using corona discharge, the enhancement of the blowing ability can be realized, and the enhancement of the blowing ability can be realized without increasing the voltage.

  As described above, according to the gas stove of any one of the first to eighth aspects, since the blowing is performed by the air flow generated based on the corona discharge, there is no generation of operating noise, vibration, or the like accompanying the motor driving or the like. In addition, the installation of a motor or the like is not necessary, and the entire gas stove can be made compact.

  In particular, according to claim 2, combustion air can be supplied to the fuel introduced into the fuel introduction port by forced air blowing by the corona discharge blower, and the air blown by the corona discharge blower is used as primary air in the combustion air. Can be used for forced supply.

  According to the third aspect, the forced air blown by the corona discharge blower blows air from the outside to the air passage through the tubular portion, and the blown air can be blown out from the blowout port toward the combustion flame. That is, the air blown by the corona discharge blower can be used for the forced supply of the secondary air in the combustion air.

  According to the fourth aspect, the forced air blown by the corona discharge blower blows air from the outside to the air passage through the tubular portion, and the blown air can be blown out from the blowout opening toward the combustion flame. An air curtain surrounding the outer periphery of the combustion gas can be formed by the air. Thereby, in addition to forced supply of secondary air, the air blown by the corona discharge blower can be used to improve the thermal efficiency of the burner by forming the air curtain.

  According to claim 5, in claim 3 or claim 4, the air flow based on forced air blowing from the corona discharge blower can be swirled in the air passage and blown out from the outlet with a tendency to swirl. It becomes like this.

  According to the sixth aspect, external air can be blown into the tubular member by forced air blow by the corona discharge blower, and the blown air can be discharged into the exhaust passage to promote exhaustion. A large amount of ozone generated along with this can be put on the air and released into the exhaust passage. This ozone can deodorize the flue gas in the exhaust passage of the grill part, so that it is possible to omit the need to install a deodorizing agent, etc., and to perform inspection and replacement work to maintain the deodorizing function. The deodorizing function can be easily maintained for a long time without necessity. Thereby, the ventilation by a corona discharge fan can be used for exhaust_gas | exhaustion acceleration | stimulation of a flue gas in the exhaust passage of a grill part, and a deodorization.

  According to the seventh aspect, the air flow rate can be changed and adjusted even in a range smaller than the change adjustable range in the continuous discharge state, for the demand of combustion air in a wider combustion range or for the deodorization of flue gas It will be possible to meet the demand for ozone.

  According to the eighth aspect of the present invention, corona discharge can be generated in multiple stages to increase the strength and flow rate of the airflow, and thereby, it is possible to realize the enhancement of the blowing capacity in the blowing using the corona discharge. Moreover, the increase in the air blowing capability can be realized without increasing the voltage.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 shows a gas stove according to a first embodiment of the present invention. This 1st Embodiment has shown the gas stove with which the corona discharge fan 2a for ventilating secondary air was attached with respect to the stove burner 3a as an example of the corona discharge fan which supplies combustion air by the ventilation.

  The corona discharge blower 2a is disposed so as to face the air passage 32, which will be described later, with a tubular member 21 disposed so that the proximal end thereof is communicated and the distal end projects and opens, and facing the opening of the tubular member 21. Needle-like electrode 22. And this corona discharge blower 2a makes the said cylindrical member 21 connect to the ground side, and makes it the counter electrode of the said acicular electrode 22, and makes it corona discharge between this cylindrical member 21 and the said acicular electrode 22 Thus, the outside air is blown as secondary air into the air passage 32 described later. That is, when a predetermined high voltage is applied to the needle electrode 22 from a circuit (not shown) for applying a discharge voltage, corona discharge is generated from the needle tip of the needle electrode 22, thereby Neutral molecules in the surrounding air are ionized, and the ions and the like are attracted to the cylindrical member 21 as a counter electrode and the air moves, and as a result, an air flow from the outside into the cylindrical member 21 is generated. By this air flow, air from the outside is supplied as secondary air into the air passage 32, that is, blown. The cylindrical member 21 constitutes a “cylindrical portion” that becomes a cylindrical electrode as a counter electrode of the needle electrode 22.

  The stove burner 3a includes a combustion pipe 31 and an air passage 32 for supplying secondary air. In FIG. 1, the code | symbol 33 is a saucer of the stove burner 3a, 34 is a virtues. The combustion pipe 31 is bent into an L shape in the illustrated example, and the upstream end side extends outwardly and is opened at the fuel introduction port 311, while the downstream end side extends upward to form a barrel portion 312. A flame port 35 is formed on the upper end side, which is the downstream end of the barrel portion 312. The flame openings 35 are arranged in the circumferential direction and open toward the outer peripheral side to form a combustion flame R on the outer peripheral side. A fuel nozzle 41 is disposed opposite to the fuel introduction port 311 so as to face the opening. When gas as fuel is injected from the fuel nozzle 41 into the fuel introduction port 311, the injection flow causes primary injection from the outside. Air is sucked into the fuel inlet 311. That is, the naturally sucked primary air is mixed with the gas from the fuel nozzle 41 to form an air-fuel mixture, and this air-fuel mixture is supplied to the flame port 35 through the barrel portion 312 to form a combustion flame R. It has become.

  As shown in FIG. 2A, the air passage 32 is extended in an endless annular shape so as to surround the body cylinder portion 312, and a blowing port 321 is opened upward. The outlet 321 is opened so as to supply secondary air upward from a lower position to the combustion flame R formed by the air-fuel mixture being ejected from the flame outlet 35 toward the outer peripheral side. Then, when secondary air is blown into the air passage 32 through the tubular member 21 of the corona discharge blower 2a, the secondary air is shown in FIG. Is divided into two in the circumferential direction, and is supplied as secondary air to the upper combustion flame R from the outlet 321 while flowing.

  Even if the secondary air is blown by forced supply by the corona discharge blower 2a instead of natural supply in this way, the motor operating noise and vibration are compared with the case of using a fan motor for forced supply of secondary air. The secondary air can be forcibly supplied silently. Moreover, as compared with the case where the fan motor is installed, the corona discharge blower 2a only needs to be provided with the cylindrical member 21 and the needle electrode 22 as cylindrical electrodes, so that the combustion air is forcibly supplied. Even so, the gas stove can be greatly downsized.

  In addition, as a voltage application to the corona discharge blower 2a, a predetermined discharge voltage may be continuously applied if the burner 3a is in combustion. Preferably, the adjustment of the combustion capacity of the burner 3a is preferably high or low. The amount of discharge of the secondary air may be changed and adjusted by changing and adjusting the level of the discharge voltage to be applied (for example, the level of heating power adjustment based on the user operation). As shown in FIG. 3, the adjustment of the air flow rate is performed by turning on / off the voltage application in a low air flow rate range that is lower than the range in which the change of the voltage itself can be easily adjusted (range of the voltage value Vb or more in FIG. 3). It is performed by alternately controlling OFF and changing control (ON / OFF control) the ON time and / or OFF time occupying the repetition cycle.

  For example, when the repetition period is kept constant and the ON time in the repetition period is gradually shortened to gradually increase the OFF time, or when the repetition period is gradually shortened, the OFF time in the repetition period is By keeping constant the ON time, or by gradually increasing the repetition period, by making the ON time occupying that repetition period constant, the OFF time gradually longer The amount of air blow can be gradually reduced. In order to gradually increase the air flow rate in the above low air flow rate range, the control of the reverse characteristics to the above may be performed. Control of ON time and OFF time in such repeated ON / OFF alternating may be performed by, for example, a pulse width modulation (PWM) method. By performing ON / OFF control of voltage application as described above, change adjustment in the range of air flow that is lower (weaker) than the range that can be changed and adjusted by changing the normal voltage itself is also realized. To be able to.

  Since the corona discharge by the corona discharge blower 2a is silent discharge, it does not generate electronic noise or the like, and does not adversely affect the operation of the control device such as the controller that adjusts and adjusts the air flow.

  As another form to which the first embodiment is applied, the following configuration may be adopted. That is, as shown in FIG. 2B, the secondary air is blown from the tangential direction into the annular air passage 32 by the corona discharge blowers 2a and 2a. The flow of the next air may be a swirl flow. In this case, the cylindrical member 21 constituting the cylindrical electrode of the corona discharge blower 2a is connected to the air passage 32 so as to extend in the tangential direction, and air from the outside is caused to flow from the outside to the air passage 32 by the air flow accompanying the corona discharge. Be blown from one side of the tangential direction. As a result, the secondary air flows as a swirling flow in the air passage 32 and is supplied to the combustion flame R from the blowout port 321 while maintaining the tendency of the swirling flow. Although FIG. 2B shows an example in which the two corona discharge fans 2a and 2a are arranged so that the air is blown from the tangential direction, the present invention is not limited thereto, and the air is blown from the tangential direction. The number of corona discharge blowers 2a may be one or three or more. The larger the number, the stronger the blowing capacity, that is, the supply capacity for the supply amount of secondary air, the supply pressure, and the like.

  In the first embodiment shown in FIG. 2 (a) and the application form shown in FIG. 2 (b), the boundary position between the cylindrical member 21 and the donut annular member constituting the air passage 32 is provided. An insulating member may be interposed, or the cylindrical member 21 itself may be omitted so that a part of the donut annular member protrudes to the outer peripheral side and is opened, and the counter electrode of the needle electrode 22 is formed by itself. You may make it comprise the "cylindrical part" which becomes.

Second Embodiment
4 to 6 show a gas stove according to a second embodiment of the present invention. In the second embodiment, the supply of secondary air as combustion air and the formation of an air curtain for the combustion flame are performed by blowing air from one or more (two in the illustrated example) corona discharge blower 2a. A gas stove with a stove burner 3b configured to perform is shown.

  As in the first embodiment, the corona discharge blower 2a itself is configured so as to face the opening of the cylindrical member 21 and the cylindrical member 21 that is connected to the ground side and functions as a counter electrode. And the needle-like electrode 22. On the other hand, in the second embodiment, the object to be connected to the corona discharge blower 2a is not the air passage 32 attached to the combustion pipe 31 of the stove burner 3a as in the first embodiment, but the casing (casing) 5 of the gas stove. The air passage 52 is attached to the top plate 51 that constitutes a part of the top plate 51.

  That is, the top plate 51 of the casing 5 has a concave step portion 53 formed in an annular region in which the five virtues 34 are disposed so as to surround the tray 33 of the gas stove 3b. The boundary with the top plate 51 is defined by a step surface 54 constituted by a slope extending in the circumferential direction toward the upper center position of the stove burner 3b. An air passage 52 having a donut ring shape and hollow inside is formed on the back side of the region including the step surface 54, and the air passage 52 has a large number of outlets 541, 541 formed through the step surface 54. ... is opened inward in the radial direction. And the base end of the cylindrical member 21 is connected to the air passage 52 from the tangential direction with respect to two positions separated from each other in the circumferential direction, and faces the opening at the distal end of each cylindrical member 21. An electrode 22 is provided.

  Further, in the stove burner 3b of this embodiment, an air-fuel mixture obtained by mixing the gas injected from the fuel nozzle 41 and the primary air naturally sucked by the injection flow is supplied to the flame outlet 35. A combustion tube 31 configured to form a combustion flame R is provided. The combustion tube 31 itself has the same configuration as the combustion tube 31 in which the air passage 32 is removed from the stove burner 3a of the first embodiment.

  In the case of the second embodiment, when each corona discharge blower 2a is operated, that is, a predetermined high voltage from a circuit (not shown) for applying a discharge voltage to each of the needle electrodes 22 described above. Is applied, corona discharge is generated from the needle tip of each needle-like electrode 22, whereby neutral molecules in the surrounding air are ionized, and these ions and the like are attracted to the cylindrical member 21 of the counter electrode, so that the air is absorbed. As a result of the movement, an air flow from the outside into the tubular member 21 is generated. Air from the outside is blown into the air passage 52 by this air flow, and is blown out from the outlets 541 toward the inner combustion flame R while turning inside the air passage 52 as a swirling flow.

  Air blown out from each outlet 541 is supplied as secondary air to the outer peripheral side of the combustion flame R, and at the same time, functions as an air curtain to improve the heating efficiency for the pan N, that is, the thermal efficiency of the gas stove. That is, the air blown out from each of the blowout ports 541 travels along the upper side of the concave step portion 53 toward the center side of the combustor 3b and collides with the combustion flame R or the combustion gas from the combustion flame R. The direction of the upward flow is changed by this collision, and the direction of the flow of the combustion gas is also changed by the upward air flow so as to surround the pan N. That is, a cylindrical flow of combustion gas that flows upward surrounding the periphery of the pan N and a cylindrical flow of air (air curtain) that flows upward and surrounds the outer peripheral side thereof are concentrically centered on the stove burner 3b. It will be formed in a shape. Thereby, it is possible to improve the thermal efficiency by guiding and holding the high-temperature combustion gas so as to flow along the outer peripheral surface of the pan N. In addition, the air forming the air curtain absorbs the heat of the top plate 51 while swirling in the air passage 52, and further absorbs the heat of the upper surface of the recessed step portion 53 even after blowing out from each blowing port 541. As a result, the degree of improvement in thermal efficiency can be further increased.

  Of course, even if it is configured to forcibly supply the secondary air and form the air curtain in this embodiment, the corona discharge blower 2a is used as the blower source. There is no generation of operating noise, vibration, etc., and forced supply of secondary air can be realized silently. In addition, compared with the case where the above fan motor is installed, the operational effects such as the ability to significantly reduce the size of the gas stove are the same as in the case of the first embodiment.

  Also in the present embodiment, a predetermined discharge voltage may be continuously applied as long as the discharge voltage is applied to each corona discharge blower 2a during combustion of the control burner 3b. The amount of blown air may be changed and adjusted by changing the level of the discharge voltage to be applied according to the level of combustion capacity adjustment (for example, the level of heating power adjustment based on user operation). This air flow change adjustment control may be the same as that described in the first embodiment (see FIG. 3).

  By making it possible to change and adjust the air flow rate, it is possible to improve the thermal efficiency by supplying the optimal secondary air amount and forming the air curtain according to the combustion amount and the like. And even if it is a case where adjustment adjustment of such blast volume is performed by automatic control, since corona discharge by corona discharge blower 2a is silent discharge and does not generate electronic noise etc., for performing automatic control It does not adversely affect the operation of control devices such as controllers. Of course, the change adjustment of the air flow rate may be changed and adjusted by a manual operation by the user without using automatic control or in combination with automatic control.

  As another form of application of the second embodiment, the corona discharge blower 2a is disposed at any position of the annular air passage 52 without being disposed in the tangential direction as the disposition position of the corona discharge fan 2a with respect to the air passage 52. If so, a swirl flow can be formed in the air passage 52. Further, the number of corona discharge fans 2a may be at least one, or three or more. Further, an insulating member may be interposed at a boundary position between the tubular member 21 and the donut annular member constituting the air passage 52, or the tubular member 21 itself is omitted and the donut annular member is omitted. It is also possible to make a part of the projection protrude toward the outer peripheral side and make it open, so that a “cylindrical portion” serving as the counter electrode of the needle-like electrode 22 is formed.

<Third Embodiment>
FIG. 7 shows a gas stove according to a third embodiment of the present invention. This 3rd Embodiment has shown the gas stove provided with the stove burner 6 comprised so that both primary air and secondary air could be supplied as combustion air by ventilation of the corona discharge blowers 2b and 2c. In addition, about the component similar to 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and the detailed description is abbreviate | omitted.

  The stove burner 6 includes a donut-shaped burner head 61 in which an opening 611 is vertically formed on the central axis and flame ports 612 and 613 are formed on the outer peripheral side, and a fuel introduction port 621 on the downstream side. And a combustion pipe 62 each having an annular air-fuel mixture passage 622. The burner head 61 is opened with a main flame port 612 facing the outer peripheral surface, a sub-flame port 613 is opened upward, and the upper opening is located above the upper opening of the opening 611. A guide plate 614 is disposed so as to cover it. An air-fuel mixture passage 622 of the combustion pipe 62 is disposed at a lower position of the flame ports 612 and 613 so as to surround a lower portion of the burner head 61, and communicates with the flame ports 612 and 613 to allow the air-fuel mixture to flow. It can be supplied.

  A needle-like electrode 23 facing the opening 611 from the lower side is disposed at a lower position of the burner head 61, and at least the opening 611 is formed with the needle-like electrode 23. A corona discharge blower 2c for blowing secondary air is constituted by a component part of the burner head 61 having a part (tubular part) connected to the ground side and serving as a counter electrode of the needle electrode 23.

  Further, the fuel nozzle 41 is disposed opposite to the fuel introduction port 621 of the combustion pipe 62 through the opening, and the needle electrode 24 is disposed opposite to the opening facing the opening. The fuel nozzle 41 and the needle electrode 24 are individually provided in each through hole of the damper plate 623 provided in the fuel introduction port 621. In particular, the through hole in which the needle electrode 24 is provided is externally provided. The size of the air is sufficient to allow inflow of air. The needle-like electrode 24 and at least a part (cylindrical part) constituting the fuel introduction port 621 are connected to the ground side to constitute a counter electrode of the needle-like electrode 24 and a constituent part of the combustion tube 62 A corona discharge blower 2b for blowing primary air is configured.

  Next, the supply of primary air or secondary air by the operation of the corona discharge blowers 2b and 2c in the present embodiment will be described. First, a circuit for applying a discharge voltage to the needle-like electrode 24 of the corona discharge blower 2b ( When a predetermined high voltage is applied from (not shown), a corona discharge is generated from the needle tip of the needle-like electrode 24, whereby neutral molecules in the surrounding air are ionized, and the fuel is introduced in which these ions and the like are counter electrodes. As a result of air being moved by being sucked by the constituent members of the port 621, an air flow from the outside through the through hole of the damper plate into the fuel introduction port 621 is generated. Air from the outside is blown into the fuel introduction port 621 by this air flow, and is mixed with the gas injected from the fuel nozzle 41 to generate an air-fuel mixture. That is, the air-fuel mixture is generated not by natural suction but by forced supply of primary air by the operation of the corona discharge blower 2b. Then, this air-fuel mixture is supplied to the flame ports 612 and 613 via the air-fuel mixture passage 622 to form a combustion flame R consisting of main and auxiliary.

  On the other hand, when a predetermined high voltage is applied from a circuit (not shown) for applying a discharge voltage to the needle-like electrode 23 of the corona discharge blower 2c, a corona discharge is generated from the needle tip of the needle-like electrode 23. As a result, neutral molecules in the surrounding air are ionized, and the ions and the like are attracted to the constituent member of the opening 611 that is the counter electrode, so that the air moves. As a result, the air moves upward from the outside of the lower position through the opening 611. Airflow will be generated. Air from outside is blown upward in the opening 611 by this air flow, and the flow of the blown air is changed by the guide plate 614 toward the combustion flame R formed on the outer peripheral side. Will be supplied as

  According to the present embodiment, even when both primary air and secondary air are supplied by forced supply, the forced supply is realized by the corona discharge blowers 2b and 2c. Compared to the case, there is no generation of motor operation noise or vibration, and the forced supply of secondary air can be realized silently, and the gas stove can be greatly downsized compared to the case where the above fan motor is installed. Can be realized.

  As for the supply of primary air and the supply of secondary air as described above, the adjustment of the air flow rate is adjusted by changing the discharge voltage applied to each needle electrode 23, 24 (automatically according to the adjustment of the thermal power by the user). In the low air flow rate range lower than the range in which the voltage itself can be easily changed and adjusted (range of voltage value Vb or more in FIG. 3) as shown in FIG. In the same manner as described in the first embodiment, voltage application may be repeatedly performed on and off alternately, and the ON time and / or OFF time occupied in the repetition cycle may be controlled by change control (ON / OFF control). . Thereby, the supply amount of primary air and secondary air optimal for the combustion conditions in the stove burner 6 can be maintained. Further, since the corona discharge by the corona discharge blowers 2b and 2c is silent discharge and does not generate electronic noise or the like, it does not adversely affect the operation of a control device such as a controller for performing the change control.

  As another form to which the third embodiment is applied, an independent cylindrical electrode may be disposed as a counter electrode of the needle-like electrode 24 in the corona discharge blower 2b for supplying primary air. Similarly, the corona discharge blower Also in 2c, an independent cylindrical electrode may be disposed as a counter electrode of the needle electrode 23. That is, such a cylindrical electrode may constitute a “cylindrical portion” that is the counter electrode of the needle-like electrode 23 or 24.

<Fourth embodiment>
8 and 9 show a gas stove according to a fourth embodiment of the present invention. This 4th Embodiment has shown the gas stove comprised so that discharge | emission promotion (exhaust acceleration | stimulation) of the flue gas in a grill part and deodorization from the flue gas might be performed by ventilation of the corona discharge blower 7. FIG.

  FIG. 8 is a perspective view of the gas stove according to the present embodiment, and this gas stove includes two stove burner portions 8 and 8 and a grill portion 9 disposed at an intermediate position. As shown in FIG. 9A, the grill portion 9 includes a grill space 91 that extends from the front to the rear in the gas stove, and an open / close type for taking in and out a heating target such as fish into the grill space 91. A front door 92, a mounting table 93 on which the object to be heated is placed, a grill burner 94, an exhaust passage 96 that extends rearward to exhaust smoke exhausted from the grill space 91 and then extends to an exhaust port 95 on the upper surface of the gas stove. It has.

  As shown in FIG. 10, the corona discharge blower 7 attached to the grill portion 9 includes a tubular member 71 having a large number of communication holes 711, 711,. Needle-shaped electrodes 72 and 73 are arranged so as to face the both-end openings 712 and face each other. The tubular member 71 has such a size that the exhaust passage 96 does not hinder the flow of smoke or the like in the flow cross-section of the exhaust passage 96, and the size of the tubular member 71 can promote the exhaust by the air blowing. 9 is set to a size that can be sufficient for deodorizing the flue gas from No. 9. The tubular member 71 is formed at a suitable position of the exhaust passage 96, preferably at a position close to the exhaust port 95, across the internal space of the exhaust passage 96, and on both sides of which the both ends define the exhaust passage 96. 97 and 97 are disposed so as to open outside the exhaust passage 96. In addition, the tubular member 71 is connected to the ground side so as to function as a counter electrode for the needle-like electrodes 72 and 73. That is, the tubular member 71 constitutes a tubular portion.

  The communication holes 711, 711,... Opened in the tubular member 71 are positions facing the downstream side of the exhaust passage 96 (downstream side of the flow of smoke with the grill space 91 as the upstream side and the exhaust port 95 as the downstream side). It was opened in The communication holes 711, 711,... Opened toward the downstream side in parallel with the flow of smoke are for promoting exhaust of the smoke flowing to the exhaust port 95 side. The communication holes 711, 711,... Opened diagonally or in a direction intersecting at right angles are for promoting diffusion of the ozone with respect to smoke emission.

  In the case of this embodiment, when a fish or the like is heated in the grill portion 9, the corona discharge blower 7 is operated in conjunction with the combustion operation of the grill burner 94, and the air blown from the corona discharge blower 7 Smoke emission from the grill 9 and deodorization from the smoke are performed. That is, when a predetermined high voltage is applied from a circuit (not shown) for applying a discharge voltage to the needle electrodes 72 and 73, corona discharge is generated from the needle tips of the needle electrodes 72 and 73, thereby Neutral molecules in the surrounding air are ionized, and these ions and the like are attracted to the constituent members of the openings 712 and 713 that are the counter electrodes, so that the air moves. As a result, the openings 712 and 713 from the outside of the exhaust passage 96. An airflow in a direction flowing into the inside is generated. By this air flow, air from the outside is blown from the openings 712, 713 at both ends toward the back of the tubular member 71, and the air that has lost its place in the tubular member 71 is exhausted from the communication holes 711, 711,. 96 will be blown out. At that time, since a large amount of ozone is generated with the occurrence of the corona discharge, the ozone is blown into the exhaust passage 96 from the communication holes 711, 711,. . The ozone is deodorized and decolored from the flue gas and exhausted from the exhaust port 95 after deodorizing and decoloring.

  According to the present embodiment, in the case of a conventional gas stove with a grill portion, it was necessary to provide a deodorizing filter or the like filled with a deodorizing agent at the exhaust port or the like as a measure against smoke emission from the grill portion, whereas corona discharge Since the ozone is diffused into the flue gas by the air blown from the blower 7 and the deodorization of the flue gas is performed, the installation of the conventional deodorization filter itself can be omitted. In addition, since there is no inconvenience such as a decrease in deodorizing performance associated with use over time in deodorization using ozone accompanying corona discharge in the corona discharge blower 7, maintenance inspection and replacement, etc., which were necessary in conventional deodorizing filters, etc. However, the deodorizing function can be maintained hygienically and economically over a long period of time. In addition, since the corona discharge blower 7 does not generate operating noise or vibrations of a fan motor or the like, the above-described effects can be realized silently, and it also causes adverse effects such as an increase in the size of the gas stove. It can be realized without.

  The change adjustment of the degree of operation of the corona discharge blower 7 (the amount of blown air or the amount of ozone generated) is related to how the discharge voltage applied to each of the needle-like electrodes 72 and 73 is linked to the heating power setting of the grill burner 94. It may be changed by manual adjustment. Further, as described in the first embodiment, the change adjustment in the low air flow rate range lower than the range in which the change adjustment of the voltage itself can be easily performed (the range of the voltage value Vb or more in FIG. 3) is the first implementation. The voltage application may be performed by ON / OFF control as described in the embodiment.

  As another form to which the fourth embodiment is applied, a tubular part as a counter electrode of the needle-like electrodes 72 and 73 may be provided separately from the tubular member 71. Further, in the case of using one acicular electrode, the one end side of the tubular member 71 may be an opening, and the acicular electrode may be disposed only on one end side and the other end side may be closed. Thereby, the air blown from the one end side can be blown out from each communication hole 711.

<Other embodiments>
In addition, this invention is not limited to the said 1st-4th embodiment, Various other embodiments are included. That is, even if the forced supply of primary air by the corona discharge blower 2b to the fuel inlet 621 of the combustion tube 62 of the third embodiment is applied to the fuel inlet 311 of the combustion tube 31 of the first or second embodiment. On the contrary, the natural intake of primary air at the fuel introduction port 311 of the combustion pipe 31 of the first or second embodiment is applied to the fuel introduction port 621 of the third embodiment, and in the third embodiment, the corona discharge blower 2b is applied. May be omitted.

  In the fourth embodiment, the tubular member 71 is disposed so as to cross the exhaust passage 96. However, the present invention is not limited to this, and ozone is generated from a corona discharge blower that is omitted from the exhaust passage and disposed outside the exhaust passage. You may make it connect with an exhaust passage and a corona discharge blower so that the air which got on may be supplied in an exhaust passage.

  Furthermore, as means for increasing the blowing capacity of the corona discharge blower using the corona discharge in any of the first to fourth embodiments, another needle-like electrode is further provided, and an air flow based on the corona discharge is generated in series and in multiple stages. It can be configured to be. For example, as shown in FIG. 11, two cylindrical electrodes (cylindrical portions) 12a and 12b are connected with an insulating cylindrical member 11 formed of an insulating material between them to form one cylindrical body. The needle electrodes 13a and 13b may be individually disposed on the cylindrical electrodes 12a and 12b, respectively. In this case, the airflow generated by the corona discharge between the first stage needle electrode 13a and the cylindrical electrode 12a is caused by the corona discharge between the second stage needle electrode 13b and the cylindrical electrode 12b. As a result of acceleration and increase in the blowing pressure (air supply pressure), the blowing flow rate (air supply flow rate) can be increased.

  In addition, even if it does not comprise in one cylinder body, by arranging the combination of the other needle electrode 13b and the cylindrical electrode 12b in series with respect to the combination of the needle electrode 13a and the cylindrical electrode 12a, Similar effects can be obtained. Furthermore, three or more combinations of the above may be arranged to be multistage. Further, by omitting the insulating cylinder 11 and disposing two or more needle-like electrodes separated from each other and in the same direction with respect to one cylindrical electrode, the same blowing capacity as described above is aimed at. You may do it.

It is a section explanatory view showing a 1st embodiment of the present invention. 2A is a cross-sectional explanatory view taken along line AA in FIG. 1, and FIG. 2B is a diagram corresponding to FIG. It is a related figure of ventilation volume and voltage, and time. It is a section explanatory view showing a 2nd embodiment. FIG. 5 is a partially cutaway plan view of FIG. 4. It is a partially cutaway perspective view of a second embodiment. It is a section explanatory view showing a 3rd embodiment. It is a perspective view which shows 4th Embodiment. 9A is a cross-sectional explanatory view taken along the line BB in FIG. 8, and FIG. 9B is an enlarged view of a portion C in FIG. 9A. FIG. 10 is a partially omitted cross-sectional explanatory view taken along the line DD in FIG. It is sectional explanatory drawing which shows the structural example which increases ventilation capability.

Explanation of symbols

2a, 2b, 2c, 7 Corona discharge blower 3a, 3b, 6 Conburner 9 Grill part 12a, 12b Cylindrical electrode (cylindrical part, counter electrode)
13a, 13b, 23, 24, 72, 73 Needle-shaped electrode 21 Tubular member (tubular portion, counter electrode)
31, 62 Combustion pipes 32, 52 Air passages 35, 612, 613 Flame port 41 Fuel nozzle 51 Top plate 53 Concave step (part of a spot plate)
71 Tubular member 95 Exhaust port 96 Exhaust passages 321 and 541 Outlet port 611 Opening portion 621 Fuel introduction port 712 and 713 Tubular member opening portion 711 Tubular member communication hole

Claims (8)

A gas stove comprising a corona discharge blower that blows air using an airflow generated by corona discharge between a needle electrode and a counter electrode. The gas stove according to claim 1, wherein
A combustion pipe for supplying an air-fuel mixture to the flame opening of the burner, and a cylindrical fuel introduction port through which fuel is introduced at the upstream end of the combustion pipe,
The corona discharge blower includes a needle electrode disposed so as to face and face the fuel introduction port, and a corona portion between the needle electrode and a cylindrical portion constituting the fuel introduction port is provided as a counter electrode. A gas stove configured to blow toward the downstream side in the combustion tube by discharging. The gas stove according to claim 1, wherein
A blowout opening that opens toward the flame opening at a position near the flame opening of the burner, an air passage that communicates with the blowout opening, and a cylindrical portion that communicates with the air passage and has a proximal end that protrudes and projects from the tip. With
The corona discharge blower includes a needle electrode disposed so as to face the opening of the cylindrical portion, and corona discharge between the needle electrode and a constituent member of the cylindrical portion as a counter electrode. A gas stove configured to blow air into the air passage. The gas stove according to claim 1, wherein
A blowout port formed on the top plate around the conoburner so as to surround and open the flame outlet of the conoburner, an air passage communicating with the blowout port, and a base end communicating with the air passage And a cylindrical portion having a tip projecting and opening,
The corona discharge blower includes a needle electrode disposed so as to face the opening of the cylindrical portion, and corona discharge between the needle electrode and a constituent member of the cylindrical portion as a counter electrode. A gas stove configured to blow air into the air passage. A gas stove according to claim 3 or claim 4, wherein
A gas stove in which the air passage is formed in an endless annular shape. The gas stove according to claim 1, wherein
A grill portion and an exhaust passage extending from the grill portion to the exhaust port for exhausting smoke;
The corona discharge blower is opposed to a tubular member disposed so that at least one end opening extends across the internal space of the exhaust passage and extends to the outside of the exhaust passage, facing the one end opening of the tubular member. A needle-like electrode disposed on the one end, and configured to discharge air current generated by corona discharge between the needle-like electrode and a portion constituting the one-end opening to the internal space of the exhaust passage. Has been a gas stove. A gas stove according to any one of claims 1 to 6,
The corona discharge fan repeats voltage application for causing corona discharge to the needle-like electrode alternately ON and OFF, and changes the ON time and / or OFF time in the repetition period, thereby changing the air flow rate. A gas stove configured to be adjustable. A gas stove according to any one of claims 1 to 6,
The corona discharge blower further includes another needle-like electrode, and is configured such that an airflow based on corona discharge is generated in series and in multiple stages.

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