經濟部中央揉準局貝工消費合作社印製 406173 五、發明説明（i ) 本發明涉及一種防止不完全燃燒裝置，該裝置使用 在由燃燒器台加熱設置在内筒裙上方的熱交換器的瓦斯熱 水器中。 作為這種類型的瓦斯熱水器的防止不完全燃燒裝置 ’申請人先前已經提交了有關特願平8-328522號的技術方 案。該技術是在主燃燒器的一套火焰口的上方設置檢測火 焰的火焰探針’同時設有上端部在熱交換器下方的内筒裙 上開口、而下部有正對放置火焰探針的火焰口處開口的燃 燒廢氣回流管所形成的環流管。依據該技術，當安裝瓦斯 熱水器的室内的氧氣濃度降低時出現不完全燃燒狀態產生 火焰升高，或者當熱交器發生堵塞時内筒裙内上部壓力上 升燃燒廢氣通過環流管回流到火焰口附近。這樣，無論什 麼情況都將使在火焰口產生的火焰升高，減少流過火焰探 針的火焰電流，利用這一點可以關閉電磁閥，防止不完全 燃燒。並且可以無時間滯后檢測出沒有著火的狀況。 如第4圖所示，這種火焰探針由絕緣體la支撐的探針j 的前端部彎折而成，與火焰口 22產生的火焰5的接觸面積 小。當熱交換器發生堵塞時，内筒裙1〇内上部的燃燒廢氣 通過環流管13的回流管13b回流到火焰口22附近，使火焰5 升同，但這種升高並不一定完全，由隔板22a隔開的火焰 口 22在回流管13b側的那一半出現升高，與其相對的另— 半難於升高的時候較多。由此原因引起火焰電流的變化較 小，存在有不完全燃燒檢測的可靠性較低的問題。 為解決上述第一個原因，如第5圖所示，可以將火焰 本紙張爾(210讀公釐1 (請先閱讀背面之注意事項再填寫本頁) 訂 4 經濟部中央橾準局員工消費合作社印製 406173 A； ------B7 _ 五、發明説明（2 ) 探針3的前端部與火焰口 22平行蠻折以增加與火如的接觸 面積。並且在圓示的例中，使上述弩折的部分與火焰口22 接近，再將其前端向上蠻折，無論火焰的大小都可獲得較 大的火焰電流。但是這時在火焰探針3前端的彆折部分的 位置上，如果與火焰口 22垂直的箭頭χ的方向（參見第5(幻 圖）有誤差時，特別是火力較小時火焰電流產生相當大的 分散，這可能主要是由於第二原因引起的，因此存在有不 完全燃燒檢測的可靠性較低的問題。 本發明的目的正是為了解決這樣的問題，提高不完 全燃燒檢測的可靠性。 依據本發明的瓦斯熱水器的防止不完全燃燒裝置， 其瓦斯熱水器由内筒裙、在内筒裙的上方連績設置的熱交 換器和在内筒裙的下方設置的燃燒器所構成，並由燃燒器 加熱流過熱交換器的供水’其特徵是具有設置在燃燒器火 焰口的上方正常燃燒狀態時位於在火焰口形成的火焰内的 火焰探針、給火焰探針加電壓並檢測流過該火焰探針的火 焰電流、當火焰電流在規定閥值以下時關閉向燃燒器供給 燃氣的電磁燃氣閥的燃燒控制器、和上端在熱交換器下方 的内筒裙内開口而下部有正對放置火焰探針的火焰口開口 的燃燒廢氣回流管的環流管，位於火焰内的火焰探針的前 端部平行回折以增加與該火焰的接觸面積。由於火焰探針在 位於火焰内的前端部分平行回折，因而增加了與火焰的接觸面 積。 在這種瓦斯熱水器的防止不完全燃燒裝置中，在火 本紙張尺度遑用中國國家椟準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注^^項再填寫本頁) -訂 _Printed by the Central Government Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative, Co., Ltd. 406173 V. Description of the Invention (i) The present invention relates to a device for preventing incomplete combustion. The device uses gas from a heat exchanger which is heated by a burner table and arranged above the inner tube skirt Water heater. As an incomplete combustion prevention device of this type of gas water heater, the applicant has previously submitted a technical proposal concerning Japanese Patent Application No. 8-328522. The technology is to set a flame probe for detecting the flame above a set of flame mouths of the main burner. At the same time, an inner tube skirt with an upper end opening under the heat exchanger is provided, and a flame mouth directly opposite the flame probe is arranged at the lower part. Circulation tube formed by open combustion exhaust gas return pipe. According to this technology, when the oxygen concentration in the room where the gas water heater is installed decreases, an incomplete combustion occurs and a flame rises, or when the heat exchanger is blocked, the pressure of the upper part of the inner tube skirt rises and the combustion exhaust gas returns to the vicinity of the flame port through the circulation pipe. In this way, in any case, the flame generated at the flame mouth will be raised, and the flame current flowing through the flame probe will be reduced. This can be used to close the solenoid valve and prevent incomplete combustion. And no time delay can be detected without fire. As shown in Fig. 4, this flame probe is formed by bending a tip end of a probe j supported by an insulator la, and has a small contact area with the flame 5 generated by the flame port 22. When the heat exchanger is blocked, the combustion exhaust gas in the upper part of the inner tube skirt 10 returns to the vicinity of the flame port 22 through the return pipe 13b of the circulation pipe 13 to make the flame 5 liters the same, but this rise is not necessarily complete. The flame port 22 separated by the plate 22a rises on the half of the return pipe 13b side, and the other half is more difficult to rise. For this reason, the change in flame current is small, and there is a problem that the reliability of incomplete combustion detection is low. In order to solve the above first reason, as shown in Figure 5, you can copy the flame paper (210 read mm1 (please read the precautions on the back before filling out this page). Cooperative printed 406173 A; ------ B7 _ V. Description of the invention (2) The front end of the probe 3 and the flame port 22 are folded in parallel to increase the contact area with the fire. And in the example shown in the circle If the cross section of the crossbow is close to the flame port 22, and then the front end is folded up, a large flame current can be obtained regardless of the size of the flame. However, at this time, at the position of the other folded part of the front end of the flame probe 3, If there is an error in the direction of the arrow χ perpendicular to the flame port 22 (see Figure 5 (phantom)), especially when the firepower is small, the flame current produces a considerable dispersion, which may be mainly caused by the second reason, so there is There is a problem of low reliability of incomplete combustion detection. The purpose of the present invention is to solve such problems and improve the reliability of incomplete combustion detection. The incomplete combustion prevention device of a gas water heater according to the present invention The water heater is composed of an inner tube skirt, a heat exchanger provided continuously above the inner tube skirt, and a burner provided below the inner tube skirt, and the water supplied through the heat exchanger is heated by the burner. The flame probe located in the flame formed in the flame mouth in the normal combustion state above the flame mouth of the device, applies voltage to the flame probe and detects the flame current flowing through the flame probe, and closes when the flame current is below a predetermined threshold. The combustion controller of the electromagnetic gas valve that supplies gas to the burner, and the circulation tube whose upper end is opened in the inner tube skirt under the heat exchanger and the lower part has a combustion exhaust gas return pipe opening facing the flame port where the flame probe is placed, The front end portion of the flame probe located inside the flame is folded back in parallel to increase the contact area with the flame. The flame probe is folded back in parallel at the front portion located in the flame, thereby increasing the contact area with the flame. In the device for preventing incomplete combustion, the Chinese National Standard (CNS) A4 (210X297 mm) is used for the paper size (please read first) ^^ back of the note and then fill out the entry page) - set _
-1 I 經濟部中央標準局貝工消费合作社印製 40G173 at ------------ B7 五、發明説明（3 ) 焰探針的位於火焰㈣前端部分平行回折以增加與火焰的 ㈣面積之外’也可以再將放置火焰探針的火焰口的大約 -半並靠近回流管的開口方向的那一部分堵塞。這樣做不 僅可以增大火焰探針與火焰的接觸面積，而且設有火焰探 針的火焰口在開口方向的厚度變薄，使得燃氣的喷出速度 加快，在此產生的火焰在氧氣缺乏時容易升高。 在前項中，如將放置火焰探針的火焰口的大約一半 並與所述回流管相對面的那一部分堵塞為更好。這樣做可 以由回流的燃燒廢'氣確實污染在該火焰口產生的火焰，使 火焰更加容易升高。 在以上各個瓦斯熱水器的防止不完全燃燒裝置中， 回流管中心面的高度應與形成火焰口的燃燒器的上端面大 體一致，這樣做對於散熱片堵塞引起的不完全燃燒，設有 火焰探針的火焰口產生的火焰更容易升高。 下面對附圖的作簡單說明 第1圖為表示本發明的瓦斯熱水器的防止不完全燃燒 裝置一種實施方案的整體結構圊。 第2圖為表示第1圖中2—2剖面部分擴大的俯視圖。 第3圖為表示第2圖的3 —3剖面圖》 第4圖為表示現有技術中火焰探針安裝部分的擴大圖。 第5圖為表示另一現有技術中火焰探針安裝部分的擴大圖 〇 下面是符號說明 本紙張尺度通用中國國家棣準（CNS ) Α4规格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁)-1 I Printed 40G173 at ------------ B7 by the Central Standards Bureau of the Ministry of Economic Affairs, B7 V. Description of the invention (3) The flame probe is located in parallel with the front part of the flame ㈣ to increase It is also possible to block the part of the flame mouth where the flame probe is placed, which is approximately -half and close to the opening direction of the return tube, outside the area of the flame. This can not only increase the contact area between the flame probe and the flame, but also reduce the thickness of the flame port provided with the flame probe in the opening direction, so that the gas ejection speed is accelerated. The flame generated here is in the absence of oxygen. Easy to rise. In the foregoing paragraph, it is better to block about half of the flame port where the flame probe is placed and the part facing the return pipe. By doing so, the flame generated at the flame mouth will indeed be contaminated by the returning combustion waste gas, and the flame will rise more easily. In each of the above gas water heaters for preventing incomplete combustion, the height of the central surface of the return pipe should be substantially the same as the upper end surface of the burner forming the flame port. In this way, a flame probe is provided for incomplete combustion caused by the blockage of the fins. The flame generated by the flame mouth is more likely to rise. The following is a brief description of the drawings. Fig. 1 shows the overall structure of an embodiment of an incomplete combustion preventing device for a gas water heater according to the present invention. Fig. 2 is a plan view showing an enlarged part of a cross section 2-2 in Fig. 1. Fig. 3 is a sectional view taken along the line 3-1 of Fig. 2; Fig. 4 is an enlarged view showing a flame probe mounting portion in the prior art. Figure 5 is an enlarged view of the flame probe installation part in another prior art. The following is a symbol description of the paper size: General China National Standard (CNS) A4 size (210X297 mm) (Please read the precautions on the back before reading) (Fill in this page)
406173 A7 B7 五、發明説明（ 4 10--内筒裙 12 --熱交換器 13 --環流管 13b--流管 20—一燃燒器（主燃燒器） 22 ' 22b--火焰口 30—-燃燒控制器 38 火焰探針 下面’參照附圖’說明適用於本發明的瞬間瓦斯熱 水器的實施方案。 如第1圖所示，在形成瞬間瓦斯熱水器燃燒室14的内 筒裙10的上方設置由傳熱管12a及散熱片12b構成的熱交換 器12 ’下方設置主燃燒器20。傳熱管12a的入口側通過纏 繞在内筒裙10外側的預熱管11與給水管15相連接，與傳熱 管出口連接的熱水管16上安裝有供熱水龍頭17。給水管15 上安裝有使用當給水量超過規定量時就會移動導桿18a使 後述的水壓響應閥28及水流開關31動作的流量孔板的水流 控制器18。水流控制器18上設有用手動調節從給水管15至 熱交換器12流量的調節熱水溫度的手動閥，圖示作了省略 (請先閱讀背面之注意事項再填寫本頁) 訂 經濟部中央標準局負工消费合作社印製 如第1圖所示’主燃燒器20是3個燃燒器單元21連接 而構成’通過與電磁燃氣閥26、能力調整閥27及水壓響應 閥28串在一起的供氣管25供給燃燒氣體。電磁燃氣閥26受 燃燒控制器30輸出的流向工作線圈26a的電流來控制開閉 ，能力調整閥27由手動調節供給主燃燒器20的燃氣量來改 變熱水器的供熱水能力。水壓響應閥28是由前述的水流控 制器18的導桿18a控制開閉，當給水量超過熱交換器12規 定量時處於打開狀態。幾乎在水壓響應閥28開啟的同時， 設置在導桿18a上的凸輪18b使水流開關31接通。 本紙張尺度適用中國國家標準（CNS > A4规格（210x297公趁） -! 經濟部中央標準局員工消费合作社印裝 406173 五、發明説明（5 ) 各燃燒器單元21用金屬板製成，如第丨圖〜第3圊所 示，分別有排成兩列的多個火焰口 22組成，各個火焰口 22 被隔板22a隔開。在最外側一列的火焰口 22中的一個（火 焰口 22b)的上方’設置有由絕緣體38a支撐的火焰探針38 的前端部。其前端部水平回折，正常燃燒狀態下位於火焰 口 22b產生的火焰内’並與火焰口的列幾乎垂直從外側插 入。火焰探針38的前端部在水平面内平行回折，圖示的例 中雖然只回折了 1次，也可以2次以上回折。 如第1圖所示，環流管13由主管道13a、回流管13b和 大徑管道13c組成’沿著内筒裙1〇的侧壁的外側垂直向下 延伸的主管道13a’其上端穿過在内筒裙1〇側壁的上部（ 既緊靠在熱交換器12的下方的部分）設有的孔穴並在燃燒 室14的上部開口’其下端部與大徑管道13c—體相連，並 通過大徑管道13c的下端的開口敞開在瓦斯熱水器内的大 氣中。從與大徑管道13c連接的主管道13a的下端分支出去 的回流管13b穿過在内筒裙1〇下部形成的切口，正對產生 插入有火焰探針38的前端部的火焰的火焰口 22b斜向開口 。火焰口 22,如第2圊和第3圊所示，與回流管13b相對面 的那一半由閉塞板24堵塞。回流管13b除去與主管道I3a連 接的根部以外，其截面形狀變形為橫長的長方形，其中心 面的高度與形成火焰口 22的燃燒器單元21的上端面一致。 如果給熱交換器12提供規定量以上的供水使水流開 關31接通’燃燒控制器30按照預先設定的順序給工作線圈 26a提供電流打開電磁燃氣閥26,啟動點火裝置（圖中省 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) 訂 經濟部中央標準局貝工消费合作社印褽 406173 A7 __________B7 五、發明説明（6 ) 略了）點燃從主燃燒器20喷出的燃氣，瓦斯熱水器開始工 作。而且，燃燒控制器3〇給火焰探針38加規定電壓通過火 焰探針38檢測火焰電流，當火焰電流在規定閥值以下時停 止向工作線圈26a輸出電流，關閉電磁燃氣閥26，瓦熱水 器停止工作。 下面說明上述實施方案的動作。開啟熱水龍頭17, 流過給水管15的水量超過規定量時，由於水流控制器18動 作，水壓響應閥28開啟，同時水流開關31接通，燃燒控制 器30開始工作。開始工作的燃燒控制器3〇打開電磁燃氣閥 26，點燃從主燃燒器2〇噴出的燃氣，在燃燒達到穩定的短 時間以後開始檢測通過火焰探針3 8的火焰電流後點火裝置 停止工作。由於火焰探針38的前端部平行回折，與大焰口 22b產生的火焰23a的接觸面積變大，所以火焰電流增大。 若檢測出的火焰電流在規定閥值以下，則判斷為由於點火 失誤或某種原因使燃燒狀態不良，停止給工作線圈26&輸 出電流，關閉電磁燃氣閥26，停止向主燃燒器2〇供給燃氣 ，使瓦斯熱水器停止工作。 主燃燒器20正常著火時’因流過火焰探針3 8的火焰 電流在規定閥值以上，電磁燃氣閥26 —直開啟，瓦斯熱水 器持續工作，流過熱交換器12的供水被主燃燒器2〇加熱， 從熱水龍頭17流出熱水。若關閉熱水龍頭17，水壓響應閥 28關閉，同時水流開關31也斷開，瓦斯熱水器停止工作。 工作狀態下’安裝瓦斯熱水器的室内空氣中氧氣濃度降低 ’或供燃燒用空氣通路發生堵塞，燃燒用空氣量不足等情 本紙張尺度適用中躅國家樣準（CNS ) Μ規格（210X297公嫠) " ----- -9 - (請先閱讀背面之注項再填寫本頁)406173 A7 B7 V. Description of the invention (4 10-inner tube skirt 12-heat exchanger 13-circulation tube 13b-flow tube 20-a burner (main burner) 22 '22b-flame port 30-- An embodiment of the instantaneous gas water heater applicable to the present invention is described below with reference to the accompanying drawings of the combustion controller 38 flame probe. As shown in FIG. 1, a transmission tube is provided above the inner skirt 10 forming the combustion chamber 14 of the instantaneous gas water heater. The main burner 20 is provided below the heat exchanger 12 'composed of the heat pipe 12a and the fins 12b. The inlet side of the heat transfer pipe 12a is connected to the water supply pipe 15 through a preheating pipe 11 wound outside the inner tube skirt 10, and is connected to the heat transfer A hot water supply faucet 17 is installed on the hot water pipe 16 connected to the outlet of the pipe. The water supply pipe 15 is provided with a flow rate where the guide rod 18a is moved when the water supply quantity exceeds a predetermined amount, and a hydraulic pressure response valve 28 and a water flow switch 31 described later are operated. Orifice water flow controller 18. The water flow controller 18 is provided with a manual valve that manually adjusts the temperature of the hot water from the water supply pipe 15 to the heat exchanger 12 and the illustration is omitted (please read the precautions on the back first) (Fill in this page) Printed by the Central Bureau of Standards and Consumer Cooperatives as shown in Figure 1. 'The main burner 20 is formed by connecting three burner units 21'. It is connected to an electromagnetic gas valve 26, a capacity adjustment valve 27, and a hydraulic response valve 28. The combined gas supply pipe 25 supplies combustion gas. The electromagnetic gas valve 26 is controlled to open and close by the current output from the combustion controller 30 to the working coil 26a. The capacity adjustment valve 27 manually adjusts the amount of gas supplied to the main burner 20 to change the water heater. The water pressure response valve 28 is opened and closed by the aforementioned guide rod 18a of the water flow controller 18, and is opened when the water supply exceeds the prescribed amount of the heat exchanger 12. The water pressure response valve 28 is opened almost At the same time, the cam 18b provided on the guide rod 18a turns on the water flow switch 31. This paper size applies the Chinese national standard (CNS > A4 size (210x297))-! Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 406173 5 5. Description of the invention (5) Each burner unit 21 is made of a metal plate, as shown in FIGS. 丨 to 3 圊, and is composed of a plurality of flame ports 22 arranged in two rows, and each flame port 22 is partitioned by a partition 22a. The front end of the flame probe 38 supported by the insulator 38a is provided above one of the flame ports 22 (the flame port 22b) in the outermost row. The front end of the flame probe 38 is horizontally folded back and is located at the flame port in a normal combustion state. The flame generated by 22b is inserted into the flame almost perpendicularly from the outside. The front end portion of the flame probe 38 is folded back in parallel in the horizontal plane. Although it is folded back only once in the illustrated example, it may be folded back more than twice. As shown in FIG. 1, the circulation pipe 13 is composed of a main pipe 13a, a return pipe 13b, and a large-diameter pipe 13c. 'The main pipe 13a' extending vertically downward along the outer side of the side wall of the inner tube skirt 10 passes through its upper end. A hole is provided in the upper part of the side wall of the inner cylinder skirt 10 (the part immediately adjacent to the heat exchanger 12) and is opened in the upper part of the combustion chamber 14. Its lower end is connected to the large-diameter pipe 13c through the large-diameter The opening at the lower end of the pipe 13c is open to the atmosphere in the gas water heater. The return pipe 13b branched from the lower end of the main pipe 13a connected to the large-diameter pipe 13c passes through the cutout formed in the lower part of the inner tube skirt 10, and is diagonally opposite to the flame port 22b that generates a flame inserted into the front end of the flame probe 38. To open. The flame port 22 is blocked by the closing plate 24 as shown in the second and third stages. Except for the root connected to the main pipe I3a, the return pipe 13b has a cross-sectional shape deformed into a horizontally long rectangle, and the height of the center plane is consistent with the upper end face of the burner unit 21 forming the flame port 22. If the heat exchanger 12 is supplied with more than a predetermined amount of water and the water flow switch 31 is turned on, the combustion controller 30 provides current to the working coil 26a in accordance with a preset sequence, opens the electromagnetic gas valve 26, and starts the ignition device (a paper is saved in the figure) Standards are applicable to China National Standard (CNS) A4 specifications (210X297 mm) (Please read the precautions on the back before filling this page) Order the seal of the Bayer Consumer Cooperative of the Central Standards Bureau of the Ministry of Economy 406173 A7 __________B7 V. Description of the invention (6) (Omitted) Ignite the gas emitted from the main burner 20, and the gas water heater starts to work. In addition, the combustion controller 30 applies a predetermined voltage to the flame probe 38 to detect the flame current through the flame probe 38, and stops outputting current to the working coil 26a when the flame current is below a predetermined threshold, closes the electromagnetic gas valve 26, and the watt water heater stop working. The operation of the above embodiment will be described below. When the hot water faucet 17 is turned on, and the amount of water flowing through the water supply pipe 15 exceeds a predetermined amount, the water pressure controller 18 is opened due to the operation of the water flow controller 18, and the water flow switch 31 is turned on, and the combustion controller 30 starts to operate. Combustion controller 30 that started working opened the electromagnetic gas valve 26 to ignite the gas emitted from the main burner 20, and after a short period of time when the combustion reached stable, it started to detect the flame current passing through the flame probe 38 and the ignition device stopped. jobs. Since the front end portion of the flame probe 38 is folded back in parallel, the contact area with the flame 23a generated by the large flame mouth 22b becomes large, so that the flame current increases. If the detected flame current is below a predetermined threshold, it is judged that the combustion state is bad due to an ignition error or some reason, and the output of current to the working coil 26 is stopped, the electromagnetic gas valve 26 is closed, and the main burner 2 is stopped. Supply gas to stop the gas water heater. When the main burner 20 is on fire normally, because the flame current flowing through the flame probe 38 is above the prescribed threshold, the electromagnetic gas valve 26 is opened directly, the gas water heater continues to work, and the water supply flowing through the heat exchanger 12 is taken by the main burner. After heating, hot water flows out from the hot water faucet 17. If the hot water faucet 17 is closed, the water pressure response valve 28 is closed, and the water flow switch 31 is also turned off, and the gas water heater stops working. Under working conditions, 'the oxygen concentration in the indoor air where the gas water heater is installed' or the air passage for combustion is blocked, and the amount of combustion air is insufficient, etc. This paper standard applies to the Chinese National Standard (CNS) M specification (210X297mm) " ----- -9-(Please read the note on the back before filling this page)
*1T 406173 at __B7 五、發明説明（7 ) 況下就會發生不完全燃燒。下面分別說明各種倩況下的動 作。 首先說明燃燒用空氣的通路雖然沒有堵塞，但沒有 進行充分換氣又連續使用時，周圍空氣中的氧氣濃度較低 時防止不完全燃燒的作用。隨著周圍空氣中的氧氣濃逐漸 減少，主燃燒器20的火焰口 22、22b產生的火焰23、23a升 高’該火焰23、23a根部產生的未燃燒氣段的長度逐漸增 大’因此正常燃燒狀態下，在燃燒的火焰23a内的火焰探 針38的前端部逐漸移至未燃燒燃氣段内，火焰電流逐漸減 少，其值若在規定閥值以下時燃燒控制器30停止給工作線 圈26a輸出電流’關閉電磁燃氣閥26，停止向主燃燒器2〇 供給燃氣並使瓦斯熱水器停止工作。如上述，正常燃燒狀 態時的火焰電流較大，所以隨著氧氣濃度的減少火焰電流 的減少量也大，這時可以確切檢測出不完全燃燒。並且在 這種情況下實際上不會產生通過環流管13的燃燒廢氣的流 通。 經濟部中央標準局貝工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) -I. 下面說明周圍空氣中的氧氣濃度正常，但設置在内 筒裙10上方的熱交換器12的散熱片12b因燃燒生成物等發 生堵塞’空氣流通不暢’燃燒用空氣量不足時防止不完全 燃燒的作用。這種堵塞引起燃燒廢氣通路的通路面積的閉 塞率增大，會使由内筒裙10、熱交換器12及主燃燒器2〇間 形成的燃燒室14内上部的壓力逐漸上升，沒有安裝環流管 13的現有產品，即使熱交換器12等堵塞引起不完全燃燒， 火焰口 22產生的火焰幾乎不會升高。 本紙張尺度適用中國國家標準（CNS ) A4規格（2丨Ο X 297公釐） 10 經濟部中央樣準局負工消费合作社印製 173_—_ 五、發明説明（8 ) 而如第1圖所示安裝有環流管13的上述實施方案中， 隨著閉塞率的增大燃燒室14内的上部麼力上升，燃燒室μ 内上部的燃燒廢氣如實線箭頭所示從環流管13的主管道 13a通過回流管13b到設有火焰探針38的火焰口 22附近，其 量隨著閉塞率的增大逐漸增加。由此火焰口 22b附近的燃 燒用空氣的氧氣濃度減少，火焰口 22b產生的火焰23a逐漸 升高。由於火焰口22b與回流管13b相對面的那一半由閉塞 板24所堵塞，因而回流管13b的開口方向（開口的吹出方 向）的厚度變薄，此處產生的火焰23a的該方向的厚度變 薄’整體容易受回流管13b吹出的燃燒廢氣的影響，隨著 廢氣通路的閉塞率的增大而完全升高。由此正常燃燒狀態 時位於燃燒的火焰23a内的火焰探針38的前端部被逐漸移 至未燃燒氣段内’火焰電流逐漸減少。當火焰電流的值在 規定閥值以下時’燃燒控制器3〇停止給工作線圈26a輸出 電流’停止向主燃燒器20供給燃氣並使瓦斯熱水器停止工 作。 因此插入火焰探針38的火焰23a隨著閉塞率的增大整 截完全升高，並且如上所述，由於正常燃燒狀態的火焰電 流較大’所以火焰電流的變化量變大，提高了不完全燃燒 的檢測的可靠性。在上述實施方案中，回流管13b的中心 面的高度設置成與形成火焰口 22的燃燒器20的上端面大體 一致’這樣更容易使火焰23a升高。 在上述實施方案中，火焰探針38的前端部平行回折 増加了與火焰的接觸面積，同時將設有火焰探針38的火焰 本紙張尺度適用中國國家椟準（CNS > A4規格（21〇X297公釐〉 11 (請先閱讀背面之注意事項再填寫本頁) 、?τ 經濟部中央標準局貝工消费合作社印家 406173 五、發明説明（9 ) 口 22的一半並位於回流管對面側的那部分堵塞。並不一定 都需要兩種同時組合實施，根據燃燒器的形狀或瓦斯熱水 器的特性的不同’即使實施其中任一種都可以提高不完全 燃燒的檢測的可靠性。 另外火焰口 22b的一半，不一定使用另外的構件閉塞 板24，也可以採用將燃燒器單元21的外板彆折堵塞的方法 。在上述實施方案中，堵塞了位於回流管對面側的火焰口 22的那一半，這樣供給燃燒廢氣的回流管nb與火焰233的 距離近’更易完全升高火焰23a，根據燃燒器的形狀或瓦 斯熱水器的特性的不同，即使堵塞回流管Hb這一侧的一 半也可以獲得充分的效果。 如上所述’依據本發明，火焰探針的前端部平行回 折増加了與火焰的接觸面積，火焰電流增大，由此增大了 火炮電流的變化量，提高了不完全燃燒的檢測的可靠性。 在火焰探針的前端部平行回折之外，再堵塞設有火 焰探針、在與回流管開口方向處的火焰口的一半，不僅火 炮探針與火焰的接觸面積增大，且設有火焰探針的火焰口 產生的火焰由於從回流管回流的燃燒廢氣確切升高，火炮 電流更加增大。因此，進一步提高了不完全燃燒的檢測的 可靠性。 還有’如果堵塞設有火焰探針、與回流管相對面的 火焰口的那一半，由於縮短了火焰口與回流管的距離，該 火焰口產生的火焰由於從回流管回流的燃燒廢氣進一步升 高。由此火焰電流更進一步增大，可以更加進—步提高不 本紙張尺歧財關家轉（CNS) M胁（21Gx297公羡） (請先聞讀背面之注項再填寫本頁) 訂 1^—^1 · 406173 A7 B7 五、發明説明（1〇 ) 完全燃燒的檢測的可靠性。 還有，如果使回流管的中心面的高度與形成火焰口 的燃燒器的上端面大體一致，容易使火焰升高，對以上所 述各效果更進一步提高。 (請先閲讀背面之注意事項再填寫本頁) *τ 線 經濟部中央橾準局貝工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐） 13* 1T 406173 at __B7 V. Inventive Note (7) Incomplete combustion will occur. The actions in each case are explained below. First, although the passage of the combustion air is not blocked, when it is used continuously without sufficient ventilation, the effect of preventing incomplete combustion when the oxygen concentration in the surrounding air is low is explained. As the oxygen concentration in the surrounding air gradually decreases, the flames 23, 23a generated by the flame ports 22, 22b of the main burner 20 rise. 'The length of the unburned gas segments generated by the roots of the flames 23, 23a gradually increases.' Therefore it is normal. In the burning state, the front end of the flame probe 38 in the burning flame 23a gradually moves into the unburned gas section, and the flame current gradually decreases. If the value is below a predetermined threshold, the combustion controller 30 stops feeding the working coil. The output current 26a closes the electromagnetic gas valve 26, stops supplying gas to the main burner 20, and stops the gas water heater. As described above, the flame current in the normal combustion state is large, so the flame current decreases as the oxygen concentration decreases, and incomplete combustion can be accurately detected at this time. And in this case, the flow of the combustion exhaust gas through the circulation pipe 13 does not actually occur. Printed by the Shell Standard Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page) -I. The following shows that the oxygen concentration in the surrounding air is normal, but the heat exchanger 12 installed above the inner skirt 10 The fins 12b are blocked by combustion products and the like, and "the air flow is not smooth." This function prevents incomplete combustion when the amount of combustion air is insufficient. This blockage causes an increase in the occlusion rate of the passage area of the combustion exhaust gas passage, which will gradually increase the pressure in the upper part of the combustion chamber 14 formed between the inner cylinder skirt 10, the heat exchanger 12, and the main burner 20, and no circulation tube is installed. In the conventional product of 13, even if the blockage of the heat exchanger 12 or the like causes incomplete combustion, the flame generated by the flame port 22 hardly rises. This paper size is in accordance with Chinese National Standard (CNS) A4 specification (2 丨 〇 X 297 mm) 10 Printed by the Central Samples Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 173___ 5. Description of the invention (8) and as shown in Figure 1 In the above-mentioned embodiment in which the circulation pipe 13 is installed, as the occlusion rate increases, the upper force in the combustion chamber 14 rises, and the combustion exhaust gas in the upper portion of the combustion chamber μ is drawn from the main pipe 13a of the circulation pipe 13 as shown by a solid line arrow. Through the return pipe 13b to the vicinity of the flame port 22 provided with the flame probe 38, the amount gradually increases as the occlusion rate increases. As a result, the oxygen concentration of the combustion air near the flame port 22b decreases, and the flame 23a generated by the flame port 22b gradually increases. Since the half of the flame port 22b opposite to the return pipe 13b is blocked by the blocking plate 24, the thickness of the return pipe 13b in the opening direction (opening blowing direction) becomes thinner, and the thickness of the flame 23a generated in this direction becomes thinner. The “thin” overall is easily affected by the combustion exhaust gas blown out by the return pipe 13b, and it rises completely as the occlusion rate of the exhaust gas passage increases. Thus, the front end portion of the flame probe 38 located in the burning flame 23a in the normal combustion state is gradually moved into the unburned gas section ', and the flame current is gradually reduced. When the value of the flame current is below a predetermined threshold value, the 'combustion controller 30 stops outputting current to the working coil 26a' and stops supplying gas to the main burner 20 and stops the gas water heater. Therefore, the flame 23a inserted into the flame probe 38 completely increases as the occlusion rate increases, and as described above, because the flame current in the normal combustion state is large, the change amount of the flame current becomes larger, and the incomplete combustion is improved. Reliability of detection. In the above embodiment, the height of the center surface of the return pipe 13b is set to be substantially the same as that of the upper end surface of the burner 20 forming the flame port 22 'so that the flame 23a can be raised more easily. In the above-mentioned embodiment, the front end of the flame probe 38 is folded back in parallel and the contact area with the flame is added. At the same time, the paper size of the flame provided with the flame probe 38 is applicable to the Chinese national standard (CNS > A4 specification (21 °). X297 mm> 11 (please read the precautions on the back before filling this page),? Τ, the Printing and Printing Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs, 406173 V. Description of the invention (9) Half of the port 22 is located on the opposite side of the return pipe Part of the blockage. It is not necessary to implement both in combination. Depending on the shape of the burner or the characteristics of the gas water heater, 'Even if any of them is implemented, the reliability of incomplete combustion detection can be improved. In addition, the flame port 22b It is not necessary to use another member to block the plate 24, and it is also possible to use a method of folding and blocking the outer plate of the burner unit 21. In the above embodiment, the half of the flame port 22 on the opposite side of the return pipe is blocked. In this way, the distance between the return pipe nb that supplies the combustion exhaust gas and the flame 233 is close, and it is easier to completely raise the flame 23a, depending on the shape of the burner or the gas water heater. Due to the difference in characteristics, a sufficient effect can be obtained even if half of the side of the return tube Hb is blocked. As described above, according to the present invention, the front end portion of the flame probe is folded back in parallel and the contact area with the flame is increased, and the flame current is increased. Therefore, the amount of change in the artillery current is increased, and the reliability of the detection of incomplete combustion is improved. In addition to the parallel turn of the front end of the flame probe, the flame probe is blocked and placed in the direction of the opening of the return tube. Not only the contact area of the artillery probe and the flame increases, but also the flame generated by the flame port provided with the flame probe increases the artillery current due to the exact increase of the combustion exhaust gas flowing back from the return pipe. Therefore, The reliability of the detection of incomplete combustion is further improved. Also, if the half of the flame port opposite to the return pipe provided with the flame probe is blocked, the distance between the flame port and the return pipe is shortened, and the flame port is generated. The flame is further increased due to the combustion exhaust gas flowing back from the return pipe. As a result, the flame current is further increased, which can be further improved. Zhang Chiqi's Wealth Management (CNS) M threat (21Gx297 public envy) (Please read the note on the back before filling out this page) Order 1 ^ — ^ 1 · 406173 A7 B7 V. Description of the invention (1〇) Complete Reliability of combustion detection. Also, if the height of the center surface of the return pipe is substantially the same as the upper end surface of the burner forming the flame port, the flame is easily raised, and the above effects are further enhanced. (Please (Please read the notes on the back before filling in this page.) * The paper size printed by the Central Bureau of Quasi-Ministry of Economy and Trade of the People's Republic of China, Beige Consumer Cooperative Co., Ltd. This paper is applicable to the Chinese National Standard (CNS) Α4 size (210X297 mm) 13