JP4187755B2 - Gas flow control device - Google Patents

Gas flow control device Download PDF

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JP4187755B2
JP4187755B2 JP2006118740A JP2006118740A JP4187755B2 JP 4187755 B2 JP4187755 B2 JP 4187755B2 JP 2006118740 A JP2006118740 A JP 2006118740A JP 2006118740 A JP2006118740 A JP 2006118740A JP 4187755 B2 JP4187755 B2 JP 4187755B2
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thermal power
gas
secondary pressure
flow rate
change
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JP2006214724A (en
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圭一 水谷
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Rinnai Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

本発明は、ガスコンロ等のガス調理器具に使用され、ガス調理器具に設けたガスバーナの設定火力の変化を少なくするガス流量制御装置に関する。   The present invention relates to a gas flow rate control device that is used in a gas cooking appliance such as a gas stove and reduces a change in the set thermal power of a gas burner provided in the gas cooking appliance.

この種のガス流量制御装置は、例えば、ガスバーナの混合管に接続されたガス噴射ノズルに連なるガス通路を有し、ガス通路には、例えばステッピングモータで駆動されてガス通路の開度を変更する火力調節手段が設けられている（例えば、特許文献１参照）。   This type of gas flow control device has, for example, a gas passage connected to a gas injection nozzle connected to a mixing pipe of a gas burner, and the gas passage is driven by, for example, a stepping motor to change the opening of the gas passage. Thermal power adjusting means is provided (see, for example, Patent Document 1).

火力調節手段の下流側であってガス噴射ノズルの上流側のガス通路には、燃料ガスの二次圧を検知する二次圧検知手段である圧力センサが設けられている。このガス流量制御装置を、例えばガスコンロに設けてガスバーナの火力を調節する場合、ガスコンロには火力調節手段の開度を制御するマイコンが設けられており、火力を中間火力にする場合には、圧力センサで検知した二次圧が、中間火力時の二次圧として予め記憶された値に一致するようにモータを制御して火力調節手段の開度を調節する。   A pressure sensor, which is a secondary pressure detecting means for detecting the secondary pressure of the fuel gas, is provided in the gas passage on the downstream side of the thermal power adjusting means and the upstream side of the gas injection nozzle. For example, when the gas flow rate control device is provided in a gas stove to adjust the thermal power of the gas burner, the gas stove is provided with a microcomputer for controlling the opening degree of the thermal power control means. The motor is controlled to adjust the opening degree of the thermal power adjusting means so that the secondary pressure detected by the sensor matches the value stored in advance as the secondary pressure at the time of the intermediate thermal power.

ところで、複数のガスバーナを設けたガスコンロでは、器具内の温度変化が大きい。このような雰囲気中に圧力センサを設けると温度変化に伴って圧力センサの特性が変化してその出力が変化する。特に、ガス器具の小型化に伴って小型の圧力センサを用いた場合、その特性の変化量は大きい。
特開２００１−５６１１８号公報（図２） By the way, in the gas stove provided with the several gas burner, the temperature change in an instrument is large. When a pressure sensor is provided in such an atmosphere, the characteristics of the pressure sensor change with changes in temperature, and the output changes. In particular, when a small pressure sensor is used as the gas appliance is downsized, the amount of change in the characteristics is large.
JP 2001-56118 A (FIG. 2)

しかしながら、上記のものでは、圧力センサの特性変化に対応して補正を行っていない。このため、圧力センサで検知した検知値を予め記憶させた値に一致させても、その時のガスバーナの火力が、圧力センサの特性が変化する前のガスバーナの火力と一致しない。   However, in the above, correction is not performed in response to a change in the characteristics of the pressure sensor. For this reason, even if the detection value detected by the pressure sensor is matched with the value stored in advance, the heating power of the gas burner at that time does not match the heating power of the gas burner before the characteristics of the pressure sensor change.

この場合、温度変化の影響を受け難い大型の圧力センサを使用することも考えらえるが、コスト高を招くと共に、ガス流量制御装置自体が大型化する。   In this case, it is conceivable to use a large pressure sensor that is not easily affected by temperature changes, but this increases the cost and the size of the gas flow control device itself.

そこで本発明は、上記の問題点に鑑み、小型の圧力センサを使用した場合に、圧力センサの特性が変化してもガスバーナの中間火力が変化しないガス流量制御装置を提供することを課題とする。   In view of the above problems, an object of the present invention is to provide a gas flow rate control device in which the intermediate thermal power of the gas burner does not change even when the characteristics of the pressure sensor change when a small pressure sensor is used. .

上記課題を解決するために本発明によるガス流量制御装置は、ガスバーナへガスを供給するガス通路に、このガス通路の開度を変更してガスバーナへのガス流量を増減して火力を調節する火力調節手段と、この火力調節手段の下流側のガス圧である二次圧を検知する二次圧検知手段とを備え、最小火力と最大火力との間に中間火力を設定し、この中間火力に対応する二次圧として予め設定された圧力になるように、二次圧検知手段の検知値に基づいて火力調節手段の開度を変更するガス流量制御装置において、上記火力調節手段を、少なくとも、大きさの相違する複数の第１連通孔が開設された固定ディスクと、第１連通孔を順次開閉する１個の第２連通孔が開設された回転ディスクとから構成し、最小火力時にはオリフィスを設けたバイパス通路のみにガスを流し、最小火力でのガス通路の開度をこのオリフィスによって規定すると共に、最大火力時には第１連通孔と第２連通孔とが重なり合って形成される開度が最大になるようにすることによって、上記最小火力と最大火力とは二次圧検知手段の検知値にかかわらず機械的に決定するように構成し、最小火力時に温度変化による二次圧検知手段の特性の変化量を検知し、その特性の変化量に基づいて上記中間火力時の二次圧検知手段の検知値を補正することを特徴とする。 In order to solve the above-described problems, a gas flow control device according to the present invention is a thermal power that adjusts thermal power by changing the opening of the gas passage to increase or decrease the gas flow rate to the gas burner in a gas passage that supplies gas to the gas burner. Adjusting means and secondary pressure detecting means for detecting a secondary pressure that is a gas pressure downstream of the heating power adjusting means, and setting an intermediate heating power between the minimum heating power and the maximum heating power, In the gas flow rate control device that changes the opening degree of the thermal power adjusting means based on the detection value of the secondary pressure detecting means so as to be a preset pressure as the corresponding secondary pressure, the thermal power adjusting means is at least: A fixed disk having a plurality of first communication holes having different sizes and a rotating disk having one second communication hole that sequentially opens and closes the first communication hole. Viper provided Gas is allowed to flow only through the passage, and the opening of the gas passage at the minimum heating power is defined by this orifice, and at the maximum heating power, the opening formed by overlapping the first communication hole and the second communication hole is maximized. Therefore, the minimum thermal power and the maximum thermal power are determined mechanically regardless of the detection value of the secondary pressure detection means, and the amount of change in the characteristics of the secondary pressure detection means due to temperature change at the minimum thermal power And the detection value of the secondary pressure detection means at the time of the intermediate heating power is corrected based on the amount of change in the characteristic.

二次圧検知手段の特性が変化した場合には、二次圧検知手段の検知値を補正して特性の変化の影響が火力の制御に及ばないようにした。また、最小火力時に特性の変化量を検知するように構成したが、これは、最小火力位置は点火後必ず通過する位置であることと、圧力の変動が火力に及ぼす影響は圧力が低い方が大きいこと等によるものである。   When the characteristics of the secondary pressure detection means change, the detection value of the secondary pressure detection means is corrected so that the influence of the change in characteristics does not affect the control of the thermal power. In addition, it is configured to detect the amount of change in characteristics at the minimum thermal power, but this is because the minimum thermal power position is a position that always passes after ignition, and the influence of pressure fluctuation on thermal power is lower when the pressure is lower. This is due to the largeness.

なお、上記最小火力でのガス通路の開度は、バイパス通路に設けられたオリフィスによって規定されるように構成すれば、二次圧検知手段の特性が変化しても、最小火力時のガス流量がオリフィスによって規定されるため、常に一定になる。   If the opening of the gas passage at the minimum heating power is defined by an orifice provided in the bypass passage, the gas flow rate at the minimum heating power can be obtained even if the characteristics of the secondary pressure detecting means change. Is always constant because it is defined by the orifice.

具体的には、上記火力調節手段を、少なくとも、大きさの相違する複数の第１連通孔が開設された固定ディスクと、第１連通孔を順次開閉する１個の第２連通孔が開設された回転ディスクとから構成し、最小火力時にはバイパス通路のみにガスを流すように構成することができる。   Specifically, the thermal power adjusting means includes at least a fixed disk having a plurality of first communication holes having different sizes and one second communication hole for sequentially opening and closing the first communication holes. The rotating disk can be configured so that the gas flows only through the bypass passage at the time of the minimum heating power.

そして、上記回転ディスクをステッピングモータで回転させるように構成し、最小火力時の回転ディスクの回転角を、ステッピングモータへ供給するパルス数またはステッピングモータに付設したリミットスイッチで規定することが望ましい。   It is preferable that the rotating disk is configured to be rotated by a stepping motor, and the rotation angle of the rotating disk at the minimum heating power is defined by the number of pulses supplied to the stepping motor or a limit switch attached to the stepping motor.

ところで、二次圧検知手段の特性が少しでも変化したら補正するように構成すると、補正が頻繁に行われ煩わしい。そこで、上記検知した二次圧の変化量が、火力変化を許容できる所定の範囲内にある場合には、二次圧検知手段の検知値に対する補正を行わないことが望ましい。   By the way, if the correction is made when the characteristic of the secondary pressure detecting means changes even a little, the correction is frequently performed and is troublesome. Therefore, when the detected change amount of the secondary pressure is within a predetermined range in which the change in the thermal power is allowed, it is desirable not to correct the detection value of the secondary pressure detection means.

以上の説明から明らかなように、本発明は、二次圧検知手段の特性が温度変化の影響を受けて変化しても、その特性の変化の影響を火力調節に及ばないようにすることによって、火力調節を常に一定の状態で行うことができる。   As is apparent from the above description, the present invention prevents the influence of the change in the characteristics from affecting the thermal power control even if the characteristics of the secondary pressure detecting means change due to the influence of the temperature change. The heating power adjustment can always be performed in a constant state.

図１および図２を参照して、１は、例えばガスコンロに設けられる本発明のガス流量制御装置である。ガス流量制御装置１は、ガスコンロに設けたガスバーナの混合管に接続されたガス噴射ノズル（図示せず）に連なるガス通路１１を備えた装置本体１２を有する。装置本体１２の下面には、ガス噴射ノズルへの燃料ガスのガス流量を調節する火力調節手段であるガスバルブ２が設けられている。   1 and 2, reference numeral 1 denotes a gas flow rate control device according to the present invention provided in, for example, a gas stove. The gas flow rate control device 1 has a device main body 12 having a gas passage 11 connected to a gas injection nozzle (not shown) connected to a mixing tube of a gas burner provided in a gas stove. A gas valve 2 is provided on the lower surface of the apparatus main body 12 as a thermal power adjusting means for adjusting the gas flow rate of the fuel gas to the gas injection nozzle.

ガスバルブ２は、ガス通路１１に連通する内部通路２１を設けたバルブケーシング２２を有し、バルブケーシング２２の上面には、内部通路２１に連通するガス流入口２３が開設されている。   The gas valve 2 has a valve casing 22 provided with an internal passage 21 communicating with the gas passage 11, and a gas inlet 23 communicating with the internal passage 21 is opened on the upper surface of the valve casing 22.

バルブケーシング２２の下面には、回転角検知手段であるリミットスイッチ３１を有するステッピングモータ３が連結され、ステッピングモータ３の回転軸３２の先端はシール材３３を介して内部通路２１に突出している。   A stepping motor 3 having a limit switch 31 serving as a rotation angle detection means is connected to the lower surface of the valve casing 22, and the tip of the rotating shaft 32 of the stepping motor 3 protrudes into the internal passage 21 via a seal material 33.

内部通路２１には、ガス通路１１の上流側に位置して回転軸３２の先端に連結された回転ディスク４と、この回転ディスク４の下流側に位置してバルブケーシング２２に嵌着された固定ディスク５とが設けられている。回転ディスク４と固定ディスク５とによって内部通路２１からガス通路１１への通路面積の開度を変更してガス流量が調節される。   In the internal passage 21, there is a rotating disc 4 that is located upstream of the gas passage 11 and connected to the tip of the rotating shaft 32, and a fixed fitting that is located downstream of the rotating disc 4 and is fitted to the valve casing 22. A disk 5 is provided. The gas flow rate is adjusted by changing the opening of the passage area from the internal passage 21 to the gas passage 11 by the rotating disc 4 and the fixed disc 5.

図２に示すように、固定ディスク５には、第１連通孔である４個の孔５１、５２、５３、５４が、相互に開口面積を相違させて同一円周上に形成され、最小火力時にオリフィス１４へガスを導く第１孔５１以外の他の孔５２、５３、５４は相互に連続して形成されている。   As shown in FIG. 2, the fixed disk 5 has four holes 51, 52, 53, and 54, which are the first communication holes, formed on the same circumference with different opening areas, and the minimum thermal power. Other holes 52, 53, 54 other than the first hole 51, which sometimes leads the gas to the orifice 14, are formed continuously with each other.

回転ディスク４には、回転軸３２が正転すると、第１連通孔の各孔５１、５２、５３、５４に順次一致して内部通路２１とバイパス路１３やガス通路１１との連通を許容する１個の楕円形の第２連通孔４１が開設されている。   When the rotary shaft 32 rotates in the forward direction, the rotary disk 4 sequentially matches the holes 51, 52, 53, 54 of the first communication hole and allows the internal passage 21 to communicate with the bypass passage 13 and the gas passage 11. One elliptical second communication hole 41 is opened.

ここで、ガスバーナの火炎が消えない程度の最小火力は、使用する燃料ガスの種類やガスバーナの能力に応じて相違する。このため、使用する燃料ガスの種類等の異なるガス器具ごとに最小火力に相当するガス流量を規定できるように構成することが望ましい。   Here, the minimum heating power at which the flame of the gas burner does not disappear varies depending on the type of fuel gas used and the capacity of the gas burner. For this reason, it is desirable that the gas flow rate corresponding to the minimum heating power can be defined for each gas appliance having different types of fuel gas to be used.

本実施の形態では、第１連通孔の内の、独立して開設された孔５１を介してガス通路１１に連通するバイパス通路１３を装置本体１２に設けると共に、バイパス通路１３に最小火力時のガス流量を規定するオリフィス１４を挿設した。このため、オリフィス１４を交換することで燃料ガスの種類やガスバーナの能力に対応した最小火力時のガス流量を設定できる。   In the present embodiment, the apparatus main body 12 is provided with a bypass passage 13 communicating with the gas passage 11 through the independently opened hole 51 among the first communication holes, and the bypass passage 13 is provided with a minimum heating power. An orifice 14 for defining the gas flow rate was inserted. For this reason, the gas flow rate at the minimum heating power corresponding to the type of fuel gas and the capability of the gas burner can be set by replacing the orifice 14.

そして、第２連通孔４１が第１連通孔のいずれの孔５１、５２、５３、５４にも一致しないと内部通路２１がガス通路１１に対して閉止され、ガス通路１１への燃料ガスの供給が停止される（図２（ａ）参照）。   If the second communication hole 41 does not coincide with any of the first communication holes 51, 52, 53, 54, the internal passage 21 is closed with respect to the gas passage 11, and the fuel gas is supplied to the gas passage 11. Is stopped (see FIG. 2A).

ステッピングモータ３を駆動して回転ディスク４を回転させ、第２連通孔４１を、第１連通孔５１、５２、５３、５３、５４のいずれかに一致させることで開度が増減されガス流量が調節される。なお、安全性等を考慮して、ガス流入口２３の下流側であって内部通路２１の途中に開閉弁である電磁安全弁６を設けている（図１参照）。   By driving the stepping motor 3 to rotate the rotating disk 4 and making the second communication hole 41 coincide with one of the first communication holes 51, 52, 53, 53, 54, the opening degree is increased and the gas flow rate is increased. Adjusted. In consideration of safety and the like, an electromagnetic safety valve 6 that is an on-off valve is provided downstream of the gas inlet 23 and in the middle of the internal passage 21 (see FIG. 1).

また、ガス通路１１には、このガス通路１１内の二次圧を検知する圧力センサ７が設けられている。圧力センサ７は、ガス通路１１に対して垂直に設けた分岐路１１ａに、シール材７１を介して挿設した導入筒７２を有し、この導入筒７２を介してガス通路１１に連通する密閉状の空室７３内には樹脂製の薄板（図示せず）が組込まれている。   Further, the gas passage 11 is provided with a pressure sensor 7 for detecting the secondary pressure in the gas passage 11. The pressure sensor 7 has an introduction cylinder 72 inserted through a sealing material 71 in a branch path 11 a provided perpendicular to the gas passage 11, and is hermetically sealed to communicate with the gas passage 11 via the introduction cylinder 72. A thin plate made of resin (not shown) is incorporated in the vacant chamber 73.

そして、ガス通路１１に燃料ガスを流すと、導入筒７２を通って空室７３内に伝播する燃料ガスの二次圧で薄板がたわみ、その時の薄板１１のたわみ量をこの薄板に貼着した歪ゲージで検知して二次圧が検知される。   When the fuel gas flows through the gas passage 11, the thin plate bends due to the secondary pressure of the fuel gas propagating through the introduction cylinder 72 and into the empty chamber 73, and the amount of deflection of the thin plate 11 at that time is adhered to this thin plate. The secondary pressure is detected by detecting with a strain gauge.

ここで、作動が電子制御されることにより調理者の利便性を高めたガスコンロでは、ガスバーナの火力調節が、例えば操作パネルに設けたタッチスイッチによって行われる。この場合、ガスバルブ２は、例えばガスバーナの火力を最小火力である火力１から最大火力である火力４までの４段階に設定できるように制御される。   Here, in the gas stove improved in the convenience of the cooker by electronically controlling the operation, the heating power of the gas burner is adjusted by, for example, a touch switch provided on the operation panel. In this case, the gas valve 2 is controlled so that, for example, the thermal power of the gas burner can be set in four stages from the thermal power 1 that is the minimum thermal power to the thermal power 4 that is the maximum thermal power.

この場合、タッチスイッチを押して火力１にすると、モータ３を駆動して回転軸３２を正転させ、第２連通孔４１を第１連通孔の独立した孔５１に一致させる。この場合、ガスバーナの火炎が消えない程度の最小火力になるようにガスが流れる（図２（ｂ）参照）。   In this case, when the touch switch is pressed and the heating power is 1, the motor 3 is driven to rotate the rotating shaft 32 in the forward direction so that the second communication hole 41 is aligned with the independent hole 51 of the first communication hole. In this case, the gas flows so that the minimum heating power is such that the flame of the gas burner does not disappear (see FIG. 2B).

次に、タッチスイッチを押して火力２に設定すると、モータ３を駆動して回転軸３２がさらに正転して、第２連通孔４１を、第１連通孔の孔５１および孔５２に一致させる。この場合、ガスバーナの火力を火力２にする流量の燃料ガスがガス通路１１へと流れる。なお、ガス通路１１への燃料ガスの流量は、第１連通孔の孔５１および孔５２と第２連通孔４１とが一致する面積に応じて変更できる（図２（ｃ）参照）。   Next, when the touch switch is pressed to set the heating power 2, the motor 3 is driven and the rotating shaft 32 further rotates in the forward direction so that the second communication hole 41 coincides with the holes 51 and 52 of the first communication hole. In this case, the fuel gas having a flow rate that makes the gas burner's thermal power 2 thermal power flows to the gas passage 11. The flow rate of the fuel gas to the gas passage 11 can be changed according to the area where the holes 51 and 52 of the first communication hole and the second communication hole 41 coincide (see FIG. 2C).

そして、火力３で、第２連通孔４１を第１連通孔の孔５２および孔５３に一致させ（図２（ｄ）参照）、火力４では第２連通孔４１を第１連通孔の孔５３および孔５４に一致させると（図２（ｅ）参照）、ガスバーナの火力をそれぞれ火力３および最大火力である火力４にする流量の燃料ガスがガス通路１１へと流れる。この場合もまた、第２連通孔４１が一致する第１連通孔の各孔５１から孔５４の面積を変更することでガス流量が調節できる。   Then, the second communication hole 41 is made to coincide with the holes 52 and 53 of the first communication hole by the thermal power 3 (see FIG. 2D), and the second communication hole 41 is made the hole 53 of the first communication hole by the thermal power 4. When the gas burner coincides with the hole 54 (see FIG. 2E), the fuel gas having a flow rate that makes the thermal power of the gas burner the thermal power 3 and the thermal power 4 that is the maximum thermal power flows to the gas passage 11, respectively. In this case as well, the gas flow rate can be adjusted by changing the area of each hole 51 to hole 54 of the first communication hole that coincides with the second communication hole 41.

ここで、火力１はオリフィス１４によりガスの流量が規定され、火力４では孔５３および孔５４によって最大流量に規定されるので、火力１での二次圧と火力４での二次圧とは共に機種毎に機械的に規定される。   Here, in the thermal power 1, the gas flow rate is defined by the orifice 14, and in the thermal power 4, the maximum flow rate is defined by the holes 53 and 54, so the secondary pressure in the thermal power 1 and the secondary pressure in the thermal power 4 are Both are mechanically specified for each model.

この火力１での二次圧と火力４での二次圧との間を３等分して火力２および火力３に対応する二次圧を算出して予めマイコン（図示せず）に記憶させておく。そして、火力２や火力３がタッチスイッチによって選択されたら、圧力センサ７の検知値がそれら予め記憶しておいた値になるようにモータ３を駆動して回転ディスク４を回転させて、ガスバルブ２の開度（ガス流量）が調節されている。   The secondary pressure at the thermal power 1 and the secondary pressure at the thermal power 4 are divided into three equal parts to calculate the secondary pressure corresponding to the thermal power 2 and the thermal power 3 and stored in advance in a microcomputer (not shown). Keep it. When the thermal power 2 or the thermal power 3 is selected by the touch switch, the motor 3 is driven to rotate the rotating disk 4 so that the detected value of the pressure sensor 7 becomes a value stored in advance, and the gas valve 2 is rotated. The degree of opening (gas flow rate) is adjusted.

ところで、複数のガスバーナを設けたガスコンロでは器具内の温度変化が大きい。このような雰囲気中では、温度変化に伴って圧力センサ７の特性が変化してその出力値が変化する。特に、ガス器具の小型化に伴って小型の圧力センサを設けた場合、その特性の変化量は大きくなる。   By the way, in the gas stove provided with the several gas burner, the temperature change in an instrument is large. In such an atmosphere, the characteristics of the pressure sensor 7 change as the temperature changes, and the output value changes. In particular, when a small pressure sensor is provided as the gas appliance is miniaturized, the amount of change in its characteristics increases.

この場合、圧力センサ７から出力される値が、マイコンに予め記憶させた初期の値に一致するようにフィードバック制御して回転軸３２の回転角を制御しても、圧力センサ７の特性が変化しているので、その時のガスバーナの火力は、圧力センサ７の特性が変化する前のガスバーナの火力と一致しない。   In this case, the characteristics of the pressure sensor 7 change even if the rotation angle of the rotary shaft 32 is controlled by feedback control so that the value output from the pressure sensor 7 matches the initial value stored in advance in the microcomputer. Therefore, the heating power of the gas burner at that time does not coincide with the heating power of the gas burner before the characteristics of the pressure sensor 7 change.

図３を参照して、例えば初期の特性を線ａで示すと、温度が上昇すると圧力センサ７の特性は図において上方にシフトし、線ｂに示す状態になる。すると、例えば火力２での二次圧がＰ１であるとすると、初期の特性である線ａにしたがって、Ｖ１という値がマイコンに記憶されている。ところが、特性が線ｂに示す状態に変化しておれば、圧力センサ７の検知値がＶ１に一致するように制御した場合、二次圧はＰ１より低いＰ２になってしまう。そのため、火力２を選択した場合の火力は当初予定していた火力より小さくなる。   Referring to FIG. 3, for example, when the initial characteristic is indicated by a line a, when the temperature rises, the characteristic of the pressure sensor 7 is shifted upward in the figure to a state indicated by a line b. Then, for example, assuming that the secondary pressure at the thermal power 2 is P1, the value V1 is stored in the microcomputer according to the line a which is an initial characteristic. However, if the characteristic is changed to the state shown by the line b, the secondary pressure becomes P2 lower than P1 when the detection value of the pressure sensor 7 is controlled to coincide with V1. Therefore, when the thermal power 2 is selected, the thermal power becomes smaller than the initially planned thermal power.

従って、図４に示すように、圧力センサ７の特性が変化する前であれば、火力１でのガス流量はＲ１となり、火力２でのガス流量はＲ２となり、火力３でのガス流量はＲ３となり、火力４でのガス流量はＲ４となる。ところが、図３に示すように圧力センサ７の特性が変化すると、火力２でのガス流量がＥ２に減少し、火力３でのガス流量がＥ３に減少する。   Therefore, as shown in FIG. 4, before the characteristic of the pressure sensor 7 is changed, the gas flow rate at the thermal power 1 is R1, the gas flow rate at the thermal power 2 is R2, and the gas flow rate at the thermal power 3 is R3. Thus, the gas flow rate at the thermal power 4 is R4. However, when the characteristics of the pressure sensor 7 change as shown in FIG. 3, the gas flow rate at the thermal power 2 decreases to E2, and the gas flow rate at the thermal power 3 decreases to E3.

このような弊害を是正するためには、図３に示すように、火力２の場合であれば、当初記憶されている値であるＶ１をＶ２に補正する必要が生じる。上述のように、火力１および火力４は機械的にガス流量が規定されるので、圧力センサ７の特性の変化の影響を受けない。したがって、火力１および火力４のいずれかの状態で圧力センサ７の特性の変化量を検知すればよい。本実施の形態では、火力１は点火後必ず通過する位置であることと、圧力の変動が火力に及ぼす影響は圧力が低い方が大きいこと等に鑑み、火力１で圧力センサ７の特性の変化量を検知することとした。   In order to correct such a harmful effect, as shown in FIG. 3, in the case of the thermal power 2, it is necessary to correct the initially stored value V1 to V2. As described above, the thermal power 1 and the thermal power 4 are not affected by the change in the characteristics of the pressure sensor 7 because the gas flow rate is mechanically defined. Therefore, it is only necessary to detect the amount of change in the characteristics of the pressure sensor 7 in either the thermal power 1 or the thermal power 4 state. In the present embodiment, in view of the fact that the thermal power 1 is a position that must pass after ignition and that the influence of the pressure fluctuation on the thermal power is larger when the pressure is lower, the thermal power 1 changes the characteristics of the pressure sensor 7. The amount was to be detected.

本実施の形態では、マイクロスイッチ３１によって、火力１となる回転ディスク４の回転角を規定するが、ステッピングモータ３へ入力するパルス数で規定しもよい。そして、第２連通孔４１と第１連通孔の孔５１とを一致させて火力１の状態にし、圧力センサ７で二次圧を検知する。圧力センサ７の特性が変化してれば、圧力センサ７から出力される検知値は当初予定した値より高い値となる。その増加分が図３でのＶ２−Ｖ１に相当する。したがって、その増加分を火力２および火力３に対応させて記憶させた値に各々加算して補正し、補正後の新たな値をマイコンに上書きさせて記憶する。   In the present embodiment, the rotation angle of the rotating disk 4 that becomes the heating power 1 is defined by the microswitch 31, but may be defined by the number of pulses input to the stepping motor 3. Then, the second communication hole 41 and the hole 51 of the first communication hole are made to coincide with each other so that the heating power is 1, and the pressure sensor 7 detects the secondary pressure. If the characteristics of the pressure sensor 7 change, the detection value output from the pressure sensor 7 will be higher than the initially planned value. The increase corresponds to V2-V1 in FIG. Therefore, the increment is corrected by adding to the stored values corresponding to the thermal power 2 and the thermal power 3, respectively, and the corrected new value is overwritten and stored in the microcomputer.

ただし、上記増加分が所定の範囲を超えるまでは、火力変化が許容できるので補正を行わないようにした。   However, until the above increase exceeds a predetermined range, the heating power change can be allowed, so that correction is not performed.

このように上記増加分が所定の範囲を超えるまでは補正を行わないことにより、圧力センサ７の応答性がステッピングモータ３の応答性に比べて遅いことや部品間のがたつきで、圧力センサ７の検知値を記憶されている値に一致させる際にステッピングモータ３が必要以上に回転する等の問題は生じない。なお、火力変化を許容できる範囲は、予め実験等により算出しマイコンに記憶させておく。   As described above, the correction is not performed until the increase exceeds the predetermined range, so that the response of the pressure sensor 7 is slower than the response of the stepping motor 3 or the rattling between the components causes the pressure sensor. When matching the detected value of 7 with the stored value, the problem that the stepping motor 3 rotates more than necessary does not occur. In addition, the range which can accept | permit a thermal power change is calculated beforehand by experiment etc., and is memorize | stored in a microcomputer.

ところで、本実施の形態では、バイパス通路１３を設け、このバイパス通路１３にオリフィス１４を設けたが、図５に示すように、第１連通孔の孔５１の上流側に所定のオリフィス孔８ａを設けたオリフィス板８を装着してもよい。   By the way, in this embodiment, the bypass passage 13 is provided and the orifice 14 is provided in the bypass passage 13. However, as shown in FIG. 5, a predetermined orifice hole 8a is provided on the upstream side of the hole 51 of the first communication hole. The provided orifice plate 8 may be mounted.

なお、本発明は上記した形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更を加えてもかまわない。   In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

本発明の一実施の形態の構成を示す図The figure which shows the structure of one embodiment of this invention ガスバルブによる流量調節を説明する図Diagram explaining flow rate adjustment by gas valve 温度変化に伴う圧力センサの特性の変化を説明するグラフGraph explaining changes in pressure sensor characteristics with temperature change 圧力センサの特性が変化した場合のガス流量の変化を説明するグラフGraph explaining changes in gas flow rate when pressure sensor characteristics change 他の実施の形態でのガス流量制御装置を示す図The figure which shows the gas flow control apparatus in other embodiment.

符号の説明Explanation of symbols

１ ガス流量制御装置
１１ ガス通路
１３ バイパス通路
１４ オリフィス
２ ガスバルブ
４ 回転ディスク
５ 固定ディスク
７ 圧力センサ 1 Gas Flow Control Device 11 Gas Passage 13 Bypass Passage 14 Orifice 2 Gas Valve 4 Rotating Disc 5 Fixed Disc 7 Pressure Sensor

Claims (3)

ガスバーナへガスを供給するガス通路に、このガス通路の開度を変更してガスバーナへのガス流量を増減して火力を調節する火力調節手段と、この火力調節手段の下流側のガス圧である二次圧を検知する二次圧検知手段とを備え、最小火力と最大火力との間に中間火力を設定し、この中間火力に対応する二次圧として予め設定された圧力になるように、二次圧検知手段の検知値に基づいて火力調節手段の開度を変更するガス流量制御装置において、上記火力調節手段を、少なくとも、大きさの相違する複数の第１連通孔が開設された固定ディスクと、第１連通孔を順次開閉する１個の第２連通孔が開設された回転ディスクとから構成し、最小火力時にはオリフィスを設けたバイパス通路のみにガスを流し、最小火力でのガス通路の開度をこのオリフィスによって規定すると共に、最大火力時には第１連通孔と第２連通孔とが重なり合って形成される開度が最大になるようにすることによって、上記最小火力と最大火力とは二次圧検知手段の検知値にかかわらず機械的に決定するように構成し、最小火力時に温度変化による二次圧検知手段の特性の変化量を検知し、その特性の変化量に基づいて上記中間火力時の二次圧検知手段の検知値を補正することを特徴とするガス流量制御装置。 The gas passage for supplying gas to the gas burner is a thermal power adjusting means for adjusting the thermal power by changing the opening of the gas passage to increase or decrease the gas flow rate to the gas burner, and the gas pressure downstream of the thermal power adjusting means. A secondary pressure detecting means for detecting the secondary pressure, setting an intermediate thermal power between the minimum thermal power and the maximum thermal power, so that the secondary pressure corresponding to the intermediate thermal power is a preset pressure, In the gas flow rate control device that changes the opening degree of the thermal power control means based on the detection value of the secondary pressure detection means, the thermal power control means is fixed with at least a plurality of first communication holes having different sizes. It consists of a disk and a rotating disk with one second communication hole that opens and closes the first communication hole in sequence, and gas flows only through the bypass passage provided with an orifice when the minimum thermal power is applied. The opening of this Together defined by orifice, at the time of maximum heating power by allowing opening to be formed by overlapping the first communicating hole and the second communicating hole is maximized, the secondary pressure sensing means and the minimum thermal power and maximum heating power Regardless of the detected value, the amount of change in the characteristics of the secondary pressure detecting means due to temperature change is detected at the minimum heating power, and the amount of change in the above-mentioned intermediate heating power is detected based on the amount of change in the characteristics. A gas flow rate control device for correcting a detection value of a next pressure detection means. 上記回転ディスクをステッピングモータで回転させるように構成し、最小火力時の回転ディスクの回転角を、ステッピングモータへ供給するパルス数またはステッピングモータに付設したリミットスイッチで規定することを特徴とする請求項１記載のガス流量制御装置。 The rotary disk is configured to be rotated by a stepping motor, and the rotation angle of the rotary disk at the minimum heating power is defined by the number of pulses supplied to the stepping motor or a limit switch attached to the stepping motor. 1 gas flow rate control apparatus according. 上記検知した二次圧の変化量が、火力変化を許容できる所定の範囲内にある場合には、二次圧検知手段の検知値に対する補正を行わないことを特徴とする請求項１または請求項２記載のガス流量制御装置。 Variation of the detected secondary pressure is, if within a predetermined range that can tolerate thermal change claim 1 or claim, characterized in that no correction for the detection value of the secondary pressure detector 2 gas flow rate control apparatus according.
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