M320060 八、新型說明： 【新型所屬之技術領域】 本新型是有關於一種防止水逆流裝置，特別是指一種 瓦斯熱水器的防止水逆流裝置。 【先前技術】 參閱圖1，是目前市面上常見的瓦斯熱水器1，其内配 置有一水盤10及一考克11，考克π連接瓦斯管路21，用 以控制供應至主燃燒器12的瓦斯量，水盤1〇的進水端與 出水端分別連設一進水管13與一出水管14，且進水管13 與出水管14分別連通供水管路22及吸熱管15。 當熱水龍頭打開時，冷水自供水管路22進入進水管13 並流入水盤10，利用水盤10内部管徑結構變化造成壓差， 使水盤10内的膜片位移而驅動水盤丨0的頂桿上挺，頂開 考克11内的瓦斯閥塞以供應瓦斯，同時啟動微動開關^ 6， 接通電子控制器17電源，並使點火針18產生連續火花以 點燃主燃燒器12，主燃燒器12燃燒產生的熱能量加於其上 方熱父換态19並傳導至吸熱管15，來自出水管14的冷水 流經吸熱管15受到加熱變成熱水，並輸出至熱水供應管路 23，以提供使用者熱水。熱水龍頭關閉後，進水管13的水 停止流動，水盤10内的膜片及挺桿均復位，以停止供應瓦 斯及點火加熱機制。 然而，此類型水點火的瓦斯熱水器丨，在未打開熱水龍 頭的狀況下，因為家庭内的供水管路彼此相連通，使得水 逆向流經水盤10,亦即出水管14後端的熱水逆流至進水管 M320060 13，而導致水盤ι〇的膜片及頂桿誤動作，打開考克u内的 瓦斯閥塞並啟動點火加熱機制，易造成瓦斯外洩或空燒等 危害安全的狀況發生。此外，高溫熱水逆流至水盤、進 水管13及進水管13前端管路，易損害水盤1〇及進水管13 • 前端管路内的零組件。 【新型内容】 因此，本新型之目的，即在提供一種可以防止瓦斯熱 φ 水器的熱水逆流至進水管的防止水逆流裝置。 於是’本新型瓦斯熱水器之防止水逆流裝置是包含一 中空管、一閥，及一彈簧，並安裝於該瓦斯熱水器的一水 盤與一進水管之間。中空管包括一第一管體與一第二管體 ，該第一管體與該進水管相連通，該第二管體藉一中空的 支管與該水盤相連通，於該第二管體的管内環周設有一凸 緣形成一較窄的通道，該支管的管内環周設有一抵止緣。 該閥置於該第二管體内，包括一本體及一端與該本體連接 • 的栓塞，該閥可在一開啟位置及一關閉位置間移動，當該 閥位於該關閉位置時，該栓塞可塞住該通道阻斷水流。該 - 彈簧置於該第二管體内，一端抵住該抵止緣，另一端抵住 該閥的本體’使該閥在無外力情況下恆位於該關閉位置。 由该進水官進入該第一管體的水流，迫使該閥由該關閉位 置移動至该開啟位置，允許水流經該支管到該水盤，一旦 停止水流進入該第一管體時，該彈簧的回復力使該閥復位 於該關閉位置。 本新型之功效在於藉由將閥及彈簧相互抵接地設於中 6 M320060 空管内，並將中空管連設於瓦斯熱水器之進水管與水盤間 ，使得由進水管進入中空管的水流可將閥自關閉位置移動 至開啟位置，允許水流到水盤，一旦停止水流進入中空管 ，彈簧的回復力使閥復位於關閉位置，而得以防止水盤後 級的熱水逆流。 【實施方式】 有關本新型之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖2 ’是本新型瓦斯熱水器之防止水逆流裝置2的 一較佳實施例，包含一 L型中空管21，及設於中空管21内 的一閥22、一彈簧23與一濾網24。 參閱圖3，防止水逆流裝置2安裝於瓦斯熱水器的一水 盤3與一進水管4之間。進水管4的一端連接中空管21， 另鳊則連接供水管路（圖未示），水盤3的進水端3 1連接 中空管21，其出水端32則連接出水管（圖未示）。本實施例 :的水盤3及進水管4，可分別與習知瓦斯熱水器i中的水 ^ 1〇及進水官13相對應，在此不再贅述瓦斯熱水器整體 架構及運作方式’但應特別注意的是，本實施例於水盤3 /、進水官4間設置有防止水逆流裝置2，而習知水盤1〇是 直接與進水管13相連接。 參閱圖2，中空管21包括一第一管體211、一第二管體 一及中空的支管213。第一管體211與第二管體212是 體成型’第一管體211與進水管4相連通，第二管體212 M320060 則藉支管213與水盤3相連通，第二管體212的管内鄰近 與第一管體211交界處環周設有一凸緣214，以形成一較窄 的通道215,支管213的管内鄰近與第二管體212交界處則 環周設有一抵止緣216。 配合圖4，閥22及彈簣23設置於第二管體212内，彈 簧23 —端抵住抵止緣216，另一端抵住閥22。閥22包括 一本體221、一栓塞222及一固定件223，本體221具有一 圓形底壁224及四支桿225，底壁224 —側頂抵彈簧23， 另一側則連接栓塞222，所述支桿225自底壁224延伸於彈 簧23外周緣，固定件223則穿設於栓塞222及底壁224， 使得栓塞222與底壁224相連接。濾網24設於第一管體 211内’用於阻播水流中的雜物進入第二管體212。 閥22可在一關閉位置及一開啟位置間移動，參閱圖4 ’彈簀23兩相反端分別抵住抵止緣216及閥22，使閥22 在無外力情況下恆位於關閉位置，當閥22位於關閉位置時 ，栓塞222抵住凸緣214並塞住通道215阻斷水流。 參閱圖3及5，當水流由進水管4進入第一管體211時 ，水流迫使閥22朝遠離凸緣214方向移動並壓縮彈簧23， 使知閥22由關閉位置移動至開啟位置。當閥22位於開啟 位置時，通道215不受栓塞222阻塞，允許水流自第一管 體211經由第二管體212及支管213流到水盤3，一旦停止 水机進入第一管體211時，彈簧23的回復力會推動閥22朝 罪近凸緣214方向移動至頂抵凸緣214，而使閥22復位於 關閉位置。在無外力情況下，彈簧23抵住閥22，使閥22 M320060 恆位於關閉位置而阻斷水流，得以防止水盤3後級的熱水 逆流至進水管4及進水管4前端管路。 參閱圖6，水盤3底部還設有一洩壓閥33，當水或蒸 氣異常昇壓至安全值（CNS規定洩壓值<17.5kgf/cm2)時，洩 壓閥33會自動洩放壓力，以避免熱水器產生氣爆危險。 • 綜上所述，藉由將閥22及彈簧23相互抵接地設於中 空管21内，並將中空管21連設於瓦斯熱水器之進水管4 $ 與水盤3間，且閥22是位於靠近進水管4的一端，使得由 進水管4進入中空管21的水流將閥22自一關閉位置移動 至一開啟位置，允許水流經中空管21到水盤3，一旦停止 水机進入中空管21，彈簧23的回復力使閥22復位於關閉 位置，而得以防止水盤3後級的熱水經由中空管21逆流至 進水管4,故確實能達成本新型之目的。 准以上所述者’僅為本新型之較佳實施例而已，當不 能以此限定本新型實施之範圍，即大凡依本新型申請專利 φ 乾圍及新型說明内容所作之簡單的等效變化與修飾，皆仍 " 屬本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一示意圖，說明習知一瓦斯熱水器； 圖2是一立體分解圖，說明本新型瓦斯熱水器之防止 水逆流裝置的較佳實施例； 抑圖3卜立體圖’說明該較佳實施例安裝於該瓦斯熱 水器的一水盤與一進水管之間； 圖4是沿圖3中之線⑽的一剖面圖，該較佳實施例 M320060 的一閥是位於一關閉位置； 圖5是一類似圖4的視圖，該較佳實施例的該閥是位 於一開啟位置；及 圖6是一底視圖，說明圖3中該水盤具有一洩壓閥。M320060 VIII. New Description: [New Technology Field] The present invention relates to a water backflow prevention device, and more particularly to a water backflow prevention device for a gas water heater. [Prior Art] Referring to Fig. 1, there is a gas water heater 1 commonly used in the market, which is provided with a water tray 10 and a cork 11, and a cork π connection gas line 21 for controlling the gas supplied to the main burner 12. An inlet pipe 13 and an outlet pipe 14 are respectively connected to the inlet end and the outlet end of the water tray, and the inlet pipe 13 and the outlet pipe 14 respectively communicate with the water supply pipe 22 and the heat absorption pipe 15. When the hot water tap is opened, the cold water enters the water inlet pipe 13 from the water supply pipe 22 and flows into the water pan 10, and the pressure difference is caused by the change of the inner pipe diameter structure of the water pan 10, so that the diaphragm in the water pan 10 is displaced to drive the top plate of the water pan 丨0. Opening the gas valve plug in the cork 11 to supply the gas, and simultaneously starting the micro switch ^6, turning on the power of the electronic controller 17, and causing the ignition needle 18 to generate a continuous spark to ignite the main burner 12, and the main burner 12 is burned. The generated thermal energy is applied to the upper heat state 19 and transmitted to the heat absorbing pipe 15, and the cold water from the water outlet pipe 14 is heated by the heat absorbing pipe 15 to be heated, and is output to the hot water supply pipe 23 for use. Hot water. After the hot water tap is closed, the water in the inlet pipe 13 stops flowing, and the diaphragm and the tappet in the water pan 10 are reset to stop the supply of gas and the ignition heating mechanism. However, this type of water-ignited gas water heater 丨, in the condition that the hot water tap is not turned on, because the water supply lines in the home are connected to each other, so that the water flows backward through the water tray 10, that is, the hot water at the rear end of the outlet pipe 14 flows back to The inlet pipe M320060 13, causing the diaphragm and the ejector of the water tray to malfunction, opening the gas valve plug in the cork u and starting the ignition heating mechanism, which is easy to cause a dangerous situation such as gas leakage or air burning. In addition, the high-temperature hot water flows back to the water tray, the inlet pipe 13, and the front end pipe of the inlet pipe 13, which easily damages the water pan 1 and the inlet pipe 13 and the components in the front end pipe. [New content] Therefore, the object of the present invention is to provide a water backflow prevention device which can prevent the hot water of the gas heat φ water from flowing back to the water inlet pipe. Thus, the water reversal prevention device of the novel gas water heater comprises a hollow tube, a valve, and a spring, and is installed between a water tray of the gas water heater and a water inlet pipe. The hollow tube includes a first tube body and a second tube body, the first tube body is in communication with the water inlet tube, and the second tube body is connected to the water tray by a hollow branch tube, and the second tube body is connected to the water tube The inner circumference of the tube is provided with a flange to form a narrower passage, and the inner circumference of the tube is provided with an abutting edge. The valve is disposed in the second tube body and includes a body and a plug connected to the body at one end. The valve is movable between an open position and a closed position. When the valve is in the closed position, the plug can be Plug the channel to block the flow of water. The spring is placed in the second body with one end against the abutting edge and the other end against the body of the valve such that the valve is constantly in the closed position without external force. The flow of water entering the first body by the water inlet officer forces the valve to move from the closed position to the open position, allowing water to flow through the branch pipe to the water pan, and once the water flow is stopped entering the first pipe body, the spring The restoring force resets the valve to the closed position. The function of the novel is to set the valve and the spring to each other in the middle 6 M320060 empty tube, and connect the hollow tube between the inlet pipe and the water tray of the gas water heater, so that the water flowing into the hollow tube from the inlet pipe can be The valve is moved from the closed position to the open position to allow water to flow to the water tray. Once the water flow stops entering the hollow tube, the restoring force of the spring resets the valve to the closed position, thereby preventing the reverse flow of hot water in the subsequent stage of the water tray. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 2, a preferred embodiment of the water reversal prevention device 2 of the novel gas water heater comprises an L-shaped hollow tube 21, a valve 22 disposed in the hollow tube 21, a spring 23 and a filter. Net 24. Referring to Figure 3, the water backflow prevention device 2 is installed between a water tray 3 of a gas water heater and an inlet pipe 4. One end of the inlet pipe 4 is connected to the hollow pipe 21, and the other is connected to the water supply pipe (not shown). The water inlet end 31 of the water tray 3 is connected to the hollow pipe 21, and the water outlet end 32 is connected to the water outlet pipe (not shown). ). The water tray 3 and the water inlet pipe 4 of the present embodiment can respectively correspond to the water 1 and the water inlet official 13 in the conventional gas water heater i, and the overall structure and operation mode of the gas water heater are not described herein. It is to be noted that in the present embodiment, the water backflow prevention device 2 is disposed between the water tray 3 and the water inlet official 4, and the conventional water tray 1 is directly connected to the water inlet pipe 13. Referring to Fig. 2, the hollow tube 21 includes a first tube body 211, a second tube body 1, and a hollow branch tube 213. The first pipe body 211 and the second pipe body 212 are body-formed. The first pipe body 211 is in communication with the water inlet pipe 4, and the second pipe body 212 M320060 is connected to the water tray 3 via the branch pipe 213, and the second pipe body 212 is in the pipe. A flange 214 is formed around the circumference of the junction with the first pipe body 211 to form a narrower passage 215. Abutment edge 216 is formed around the pipe adjacent to the second pipe body 212. 4, the valve 22 and the magazine 23 are disposed in the second tubular body 212 with the spring end 23 abutting against the abutting edge 216 and the other end abutting the valve 22. The valve 22 includes a body 221, a plug 222 and a fixing member 223. The body 221 has a circular bottom wall 224 and four legs 225. The bottom wall 224 is a side top abutting spring 23, and the other side is connected with a plug 222. The support rod 225 extends from the bottom wall 224 to the outer periphery of the spring 23, and the fixing member 223 is disposed through the plug 222 and the bottom wall 224 such that the plug 222 is connected to the bottom wall 224. The screen 24 is disposed in the first tube body 211 for blocking the debris in the water stream from entering the second tube body 212. The valve 22 is movable between a closed position and an open position. Referring to Figure 4, the opposite ends of the magazine 23 respectively abut against the abutting edge 216 and the valve 22, so that the valve 22 is constantly in the closed position without external force, when the valve When the 22 is in the closed position, the plug 222 abuts the flange 214 and plugs the passage 215 to block the flow of water. Referring to Figures 3 and 5, when the water flow enters the first tubular body 211 from the inlet pipe 4, the water flow forces the valve 22 to move away from the flange 214 and compresses the spring 23, causing the valve 22 to move from the closed position to the open position. When the valve 22 is in the open position, the passage 215 is not blocked by the plug 222, allowing water to flow from the first pipe body 211 to the water pan 3 via the second pipe body 212 and the branch pipe 213, once the water machine is stopped from entering the first pipe body 211, The restoring force of the spring 23 pushes the valve 22 toward the sinus near the flange 214 to the abutment flange 214, resetting the valve 22 to the closed position. In the absence of external force, the spring 23 abuts the valve 22, keeping the valve 22 M320060 in the closed position to block the flow of water, thereby preventing the hot water in the subsequent stage of the water tray 3 from flowing back to the inlet pipe 4 and the front end of the inlet pipe 4. Referring to Fig. 6, a pressure relief valve 33 is further provided at the bottom of the water tray 3. When the water or steam is abnormally boosted to a safe value (the CNS prescribed pressure relief value <17.5 kgf/cm2), the pressure relief valve 33 automatically releases the pressure. To avoid the danger of gas explosion in the water heater. In summary, the valve 22 and the spring 23 are placed in the hollow tube 21 against each other, and the hollow tube 21 is connected between the inlet pipe 4 $ of the gas water heater and the water tray 3, and the valve 22 is Located near one end of the inlet pipe 4, the flow of water entering the hollow tube 21 from the inlet pipe 4 moves the valve 22 from a closed position to an open position, allowing water to flow through the hollow tube 21 to the water tray 3, once the water machine is stopped. The empty tube 21 and the restoring force of the spring 23 reset the valve 22 to the closed position, thereby preventing the hot water of the subsequent stage of the water tray 3 from flowing back to the inlet pipe 4 via the hollow tube 21, so that the object of the present invention can be achieved. The above-mentioned ones are only the preferred embodiments of the present invention, and when it is not possible to limit the scope of the present invention, that is, the simple equivalent changes made by the new patent application φ dry circumference and the new description contents are Modifications are still within the scope of this new patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a conventional one gas water heater; FIG. 2 is an exploded perspective view showing a preferred embodiment of the water backflow prevention device of the novel gas water heater; The preferred embodiment is installed between a water pan and a water inlet pipe of the gas water heater; FIG. 4 is a cross-sectional view along line (10) of FIG. 3, wherein a valve of the preferred embodiment M320060 is in a closed position; Figure 5 is a view similar to Figure 4, the valve of the preferred embodiment being in an open position; and Figure 6 is a bottom view showing the water pan of Figure 3 having a pressure relief valve.
10 M32006010 M320060
【主要元件符號說明】 2 ....... …防止水逆流裝置 223… •…固定件 21…… •…中空管 224… •…底壁 211 •… •…第一管體 225… …·支桿 212 ···. •…第二管體 23•…· •…彈簧 213… •…支管 24••… …·濾網 214… …·凸緣 3…… —水盤 215… •…通道 31 "… …·進水端 216… —抵止緣 32···.· •…出水端 0 0..... ....0 Θ Ί Ί..... .···、、由感β月 L L..... J D 221… •…本體 4…… …·進水管 222… •…栓塞 11[Description of main component symbols] 2 .............Preventing water backflow device 223... •...Fixture 21... •...Hard tube 224... •...Bottom wall 211 •... •...First tube body 225... ...· struts 212 ···. •...Second tube body 23•...·•...spring 213... •...branch tube 24••...·filter 214... ...·flange 3...—water tray 215... •... Channel 31 "......inlet end 216... -butting edge 32·····•...water outlet 0 0..... ....0 Θ Ί Ί..... .··· ,, by the sense of β L L..... JD 221... •...body 4... ...·inlet pipe 222... •...plug 11