(1) 1260992 ' 九、發明說明 【發明所屬之技術領域】 _ 本發明涉及搭載在噴霧機或者噴灑機等上的液體槽筒 ，特別涉及安裝在液體槽筒的注入口上的粗濾器。 【先前技術】 在噴霧機或者噴灑機等作業機上搭載有貯存農藥等液 Φ 體的液體槽筒。在進行農藥噴霧等作業時，液體槽筒內的 液體擺動，容易産生重心移動而變得不穩定。特別是在背 負式作業機的情況下，因爲在背負於作業人員身上的狀態 下使用，所以，因作業人員的行走等而易於産生上述問題 〇 爲了解決這種問題，在日本特開2003 — 2906 1 1號公 報中揭示有一種在液體槽筒內組裝有消波板的技術。由於 消波板相對於處於穩定狀態的液體槽筒內的液體的液面大 •鲁致以直角狀設置，因此，在液體擺動時對該移動給予阻力 ^ 。從而’防止了液體的波動，使液體槽筒的重心移動得到 消減。 這種消波板由與液體槽筒的內部形狀相對應的可撓性 板材所構成。在安裝消波板時，使消波板彎曲並從液體槽 .筒的注入口***，在內部解放彎曲。被解放的消波板掛靠 在液體槽筒內的保持用凸部上而成爲安裝狀態。 可是’爲了將在日本特開2〇〇3 — 2906 1 i號公報中所 揭示的消波板彎曲成可***到液體槽筒的注入口內的程度 -4 - (2) 1260992 ，需要較大的力。而且，當在液體槽筒內解放彎曲的消波 板時，有必要配合設置在液體槽筒內的保持用凸部的位置 來解放彎曲。因此，消波板的組裝作業繁瑣，存在需要操 作經驗的問題。同樣地，從液體槽筒中取出消波板也很困 難。 本發明是爲了解決這樣的課題而爲之，其主要目的在 於提供一種能夠抑制貯存在液體槽筒內的液體波動等、並 φ 能夠容易地安裝以及取下的裝置。 【發明內容】 爲了實現上述目的，本發明的特徵在於：是一種裝脫 可能地安裝在液體槽筒的注入口上的粗濾器，包括：被保 持在注入口內的筒狀部分；設置在筒狀部分的過濾部分； 以及設置在筒狀部分，在將筒狀部分保持在上述注入口內 的狀態下，接觸貯存在液體槽筒內的預定量的液體，並對 .φ該液體的流動給以阻力的阻力部分。 * 在該構造中，阻力部分成爲了液體槽筒用粗濾器的構 造要素之一。所以，通過將粗濾器安裝在液體槽筒的注入 口上，也完成了阻力部分的安裝。這樣，配置在液體槽筒 內的阻力部分與液體槽筒內的特定量的液體接觸，並給予 其阻力’因此，能夠抑制液體的波動或者重心移動。 此外’優選具有限制筒狀部分從注入口脫出的脫落防 止機構。這是因爲例如，在將具有發泡性的液體投入液體 槽筒內的情況下’雖然因爲從液體産生的氣泡使粗濾器欲 -5- 1260992 ‘ (3) 浮起，但是藉由脫落防止機構，能夠防止粗濾器脫出。 筒狀部分在被保持在注入口內的狀態下，能夠以該筒 狀部分的中心軸線爲中心進行旋轉較佳。這是因爲若使筒 狀部分旋轉，則阻力部分也旋轉，從而能夠攪拌液體槽筒 內的液體。爲了使該旋轉操作容易，設置用於旋轉筒狀部 分的旋鈕部是有效的。 而且’也可以將阻力部分設置在與筒狀部分的開放端 φ 相對側的端部上，具有能夠從開放端***到筒狀部分的內 部空間的外形。通過該構造，在將一個粗濾器的阻力部分 裝入到另一粗濾器的筒狀部分的內部的狀態下，可以重叠 多個粗濾器，減少用於保管的空間。 關於阻力部分’可以考慮各種結構。例如，在與筒狀 部分的開放端相對側的端部上配設板狀體的簡易結構較佳 〇 根據本發明，藉由將粗濾器安裝在液體槽筒的注入口 Φ ，也同時完成了阻力部分的朝液體槽筒內的設置。即，不 需要繁瑣地在液體槽筒中安裝以及取下如上上述的習知的 消波板。 此外，由於這樣安裝的阻力部分，使得液體的波動或 者重心移動得到了抑制，因此，還具有這樣的效果：減輕 ,了使用搭載該液體槽筒的作業機，特別是背負式作業機進 行作業的作業人員的負擔。 【實施方式】 -6- (4) 1260992 下面，參照附圖對本發明的粗濾器的較佳實施方式進 行說明。其中，在本說明書中，上下、高度等詞語以圖1 所示的狀態作爲基準來使用。 圖1是能夠適用本發明的粗濾器的背負式動力噴霧機 在水平面放置狀態的簡要側視圖，部分剖面來表示液體槽 筒內部。其中，圖1的點線假定是液體槽筒內的液面。圖 示的背負式動力噴霧機1 0包括：貯存農藥等液體的液體 φ槽筒12、吸引該液體槽筒12內的液體並向噴霧噴嘴（未 圖示）壓送的泵1 4、作爲用於驅動泵1 4的原動機的內燃 引擎16、以及貯存內燃引擎16的燃料的燃料槽筒18。它 們被配設在背負框20內，使用者背負著該背負框20進行 作業。 這種背負式動力噴霧機1 〇的液體槽筒1 2由半透明的 合成樹脂構成，能夠從外部確認內部的液體量。在液體槽 筒1 2的上部形成有用於將液體注入到液體槽筒1 2的內部 肇的注入口 22。注入口 22是從液體槽筒12突設的近似圓筒 體，在其外周面上形成有螺絲部’在該螺絲部上螺合有用 於封閉注入口 22的蓋帽24。 液體槽筒12的注入口 22形成爲裝脫可能地安裝著本 發明的液體槽筒用粗濾器26。在注入口 22的內周面上設 ，置有支援粗濾器2 6的支援部2 8。支援部2 8被設置在注入 口 22的開放端（上端面）下方的位置上，向著徑向內側 突出形成。此外，支援部2 8如作爲注入口 2 2的周邊部的 平面圖的圖2所示，被配設於在同一圓周上被均等地分割 (5) 1260992 爲多個（在圖示實施方式中分割爲四個）的各位置上 互比鄰的支援部2 8、2 8之間形成有一定的間隔3 0。 濾器26上設置有後面詳細敍述的筒狀部分32，筒狀 3 2搭掛支援部2 8上而被支援，形成保持有粗濾器2 6 態。 粗濾器26如圖3所示，具有***注入口 22內的 圓筒形的筒狀部分3 2以及設置在該筒狀部分3 2下端 φ濾部分3 4，它們由合成樹脂一體成形較佳。其中，圖 從過濾部分34側看到的本實施方式的粗濾器26的狀 立體圖。 筒狀部分32沿著其軸線方向被區分爲三個部分 如圖1以及圖3所示的上部3 6、中間部3 8以及下部 上部3 6的外徑比中間部3 8的外徑大，下部4 0的外 中間部3 8的外徑小。更具體地說，中間部3 8的外徑 於通過在注入口 2 2上形成的支援部2 8的內緣所構成 φ的直徑，上部3 6的外徑稍小於注入口 22的開放端的 且大於上述圓的直徑。因此，如果從下部4〇開始將 部分3 2***到注入口 2 2內，則下部4 0以及中間部： 過由支援部2 8所圍成的區域，中間部3 8和上部3 6 的段差4 1被載置在支援部2 8上’ 1¾]狀邰分3 2在注 、22內被可旋轉地保持著（參照圖1 )。在該狀態下， 筒狀部分3 2的上端開放，所以，能夠從那裏將液體 到筒狀部分3 2內，由過濾部分3 4過濾掉液體中所含 異物。 〇相 在粗 部分 的狀 近似 的過 3是 態的 ，即 40 ° 徑比 稍小 的圓 外徑 筒狀 丨8穿 之間 入口 因爲 注入 有的 -8 - (6) 1260992 其中，在圖1的狀態中，爲了不使筒狀部分32的開 放端（上端）比注入口 2 2的開放端還向上方突出，使筒 狀部分3 2的上部3 6的高度爲從支援部2 8的上面到注入 Q 2 2的開放端的高度以下。因此’在將粗濾器2 6保持在 注入口 22的狀態下的同時，能夠將蓋帽24螺合在注入口 22上。此外，螺合在注入口 22上的蓋帽24的背面（內側 的天井面）構成爲接觸處於保持狀態的筒狀部分3 2的上 φ端面，並向下方按壓筒狀部分32較佳。這是因爲，此時 筒狀部分32 (即粗濾器26 )在被夾持在支援部28和蓋帽 24之間的狀態下以不能旋轉的狀態而被固定於注入口 22 內。 過濾部分3 4具有=被設置爲在周向上均等地劃分筒 狀部分32的下端面的多根（在圖不實施方式中爲六根） 骨部材42、由這些骨部材42所劃分的多個扇狀開口部44 、以及被設置在扇狀開口部44上並捕捉包含在向液體槽 ϋ筒1 2注入的液體中的異物的篩網46。 在過濾部分3 4的下方配設有阻力部分4 8 °阻力部分 4 8給液體槽筒1 2內的液體以阻力’與筒狀部分3 2以及過 濾部分3 4 —體成形較佳。圖示實施方式中的阻力部分4 8 具備：從過濾部分3 4的中心點、即多根骨部材4 2的交點 與筒狀部分32同軸地向下方延伸的軸芯50’以及從該軸 芯5 0呈放射狀延伸的多片（圖示實施方式爲六片）近似 長方形狀的板狀體5 2。板狀體5 2在周向上被均等地配設 ，分別與對應的骨部材4 2結合。之所以均％配設板狀體 -9- (7) 1260992 5 2，如後上述，是考慮到攪拌液體時的平衡等因素。而且 ，各板狀體5 2的外側邊緣部5 4向上方延伸到中間部3 8 和下部40之間的段差55，與筒狀部分32的下部4〇的外 周面接合。其結果，比起僅使板狀體5 2與軸芯5 〇以及骨 部材42結合的情況，使板狀體52的剛性有所提高。 從軸芯5 0的中心軸線到外側邊緣部5 4的長度（水平 尺寸），在筒狀部分3 2的中間部3 8的外周面的半徑以下 φ 。這是爲了使阻力部分48也能夠容易地***到注入□ 22 內。此外，關於阻力部分48的高度（板狀體52的上下方 向尺寸），因爲阻力部分4 8的重要功能就是讓液體的流 動受到阻力，因此，如圖1所示，在將粗濾器26裝入注 入口 2 2的狀態下，使阻力部分4 8的至少一部分能夠浸入 液體槽筒1 2內的一定量的液體中的尺寸是必要的。 這裏，希望注意到，本實施方式中的粗濾器26具有 的構造考慮到了如圖4所示的重叠收納狀況。即，本實施 •方式，可以將一個粗濾器26的筒狀部分32的下部40和 阻力部分4 8在鬆動比較少的狀態下嵌合於其他同形狀的 粗濾器26的筒狀部分32的內部。爲了獲得這種構造，簡 單地，可以預定形狀以及尺寸，使得粗濾器2 6的筒狀部 分3 2的下部4 0和阻力部分4 8以筒狀部分3 2的中心軸線 爲中心旋轉的情況下所形成的旋轉體的外形形狀，與由筒 狀部分3 2的內周面以及底面所劃分成的形狀大致相同。 更詳細地說，筒狀部分32的下部40的外徑被做成比 中間部3 8的內徑小。另外，從阻力部分4 8的軸芯5 0的 -10- 1260992 丨 (8) •中心軸線到板狀體52的外側邊緣部54的長度被做成比筒 狀部分3 2的中間部3 8的內周面的半徑稍小。其中，因爲 板狀體52的下部被收容在筒狀部分32的被縮小了直徑的 下部4 〇內，所以，板狀體5 2的外側邊緣部5 4的下部對 照下部4 0的內側形狀而被削切成近似長方形狀。而且’ 從筒狀部分3 2的中間部3 8和下部4 0之間的段差5 5到阻 力部分48的下端的尺寸（阻力部分48的高度）被做成與 φ從筒狀部分3 2的開放端到底面的尺寸（筒狀部分3 2的深 度）相同或者比其小。在本實施方式中’阻力部分4 8的 高度被做成比筒狀部分3 2的深度小一些’一個粗濃器2 6 的中間部3 8的下端在無鬆動的狀態下嵌入到另一粗濾器 26的開放端。因此，可以可靠地連接重叠的粗濾器26、 26，使處置變得很容易。如圖4所示，在重叠多個粗濾器 26的情況下，作爲整體變得緊湊，與節省空間相關，適合 運送或者保管。 φ 而且，本實施方式中的粗濾器2 6上設置有限制從液 體槽筒12的注入口 22向上方移動的、防止粗濾器26從 注入口 22脫出的脫落防止機構。作爲該脫落防止機構， 在本實施方式中，從筒狀部分3 2的中間部3 8的外周面向 外側突出形成板狀片5 6。板狀片5 6實質上與在注入口 2 2 _的比鄰的支援部2 8、2 8之間劃分成的間隔3 0 (參照圖2 )同形，尺寸被做成僅比間隔3 0小一點。此外，板狀片 5 6被配置成從筒狀部分3 2的上部3 6和中間部3 8之間向 下方隔開預定間隔，該間隔被做成比注入口 2 2的支援部 -11 - (9) 1260992 28的厚度大。因此，在將粗濾器26裝入到注入口 22上時 ，如果使板狀片5 6穿過支援部2 8、2 8之間，使粗濾器2 6 以其中心軸線旋轉，則板狀片5 6能夠被配置在支援部2 8 的下側，在該狀態下，粗濾器2 6向上方的移動被限制。 板狀片5 6至少有一個就足夠，但是，與間隔3 0數量相同 、即設置有四個較佳。 此外，在粗濾器2 6上，爲了使其繞軸線的旋轉容易 φ化，設置有旋鈕部5 8 (參照圖1 )。圖示的旋鈕部5 8從 筒狀部分3 2的上部3 6的內周面向徑向內側突出、且爲沿 軸線方向延伸的板形狀，設置有至少一個，設置多個較佳 。其中，爲了如圖4所示重叠收納多個粗濾器2 6，旋鈕部 5 8的內緣比筒狀部分3 2的中間部3 8的內周面還向直徑方 向外側配置。此外，爲了使一個粗濾器26的中間部3 8的 下端能夠嵌入到另一粗濾器26的筒狀部分32的開放端， 旋鈕部5 8的上端位於比筒狀部分3 2的開放端還靠下側的 φ位置。 下面，關於將上述結構的粗濾器26安裝在液體槽筒 1 2的注入口 2 2上的方法以及該粗濾器2 6的作用，以由濃 縮藥液在液體槽筒1 2內製作特定濃度的藥液的情況爲假 設來進行說明。 首先，從液體槽筒12的注入口 22取下蓋帽24，接著 ，在安裝粗濾器26之前，從注入口 22投入計量了預定量 的濃縮藥液。在濃縮藥液的投入結束之後，將粗濾器2 6 安裝在液體槽筒12的注入口 22上。在安裝粗濾器26時 -12- (10) 1260992 ，按粗濾器26的阻力部分48、過濾部分34、筒狀部分32 這樣的順序***注入口 22。在***筒狀部分3 2時，使筒 狀部分3 2繞著其軸線旋轉，將作爲脫落防止機構的板狀 片5 6調整到注入口 2 2處的支援部2 8、2 8之間的間隔3 0 的位置。在調整好位置後，使板狀片5 6穿過間隔3 0。如 果這樣繼續***筒狀部分3 2，則筒狀部分3 2的段差4 1掛 在支援部28上，粗濾器26被支援。由於此狀態只不過是 φ段差41載置在支援部28上的狀態，因此，能夠使粗濾器 2 6自由地旋轉。然後，使筒狀部分3 2旋轉，使板狀片5 6 相對於間隔3 0的位置錯開。該旋轉操作通過使用旋鈕部 5 8而可以很容易地進行。通過筒狀部分3 2的旋轉而使板 狀片5 6位於支援部2 8的下方。在該狀態下，即使向上方 牽拉粗濾器2 6，因爲板狀片5 6被支援部2 8所阻擋，所以 進一步的向上方的移動也被限制。 這樣，當將粗濾器26安裝在注入口 22之後，從粗濾 φ器26的開放端注入用於將濃縮藥液稀釋到預定濃度的水 。注入水的分量確認是通過從半透明的液體槽筒1 2的外 部目視液面、與刻設在液體槽筒1 2上的刻度等對比來進 行的。另外，水中含有的異物被粗濾器26的過濾部分34 捕捉，防止異物混入液體槽筒1 2內。 其中，在液體槽筒1 2內的藥液具有發泡性的情況下 ，由於水的注入而産生氣泡，産生向上推壓粗濾器2 6的 力。但是，如上上述，在本實施方式的粗濾器2 6上設置 有板狀片5 6，因爲被配置在支援部2 8的正下方，所以粗 -13- (11) 1260992 濾器2 6不會從注入口 2 2脫出。因此，作業人員無需在 粗濾器2 6的位置狀態，可以專心於水的注入。 如果注入的水超過一定量，從表示藥液（液體）的 面的圖1的點線的位置可知，粗濾器26的阻力部分48 於浸入液體槽筒1 2內的藥液中的狀態。若在該狀態下 轉粗濾器2 6，則阻力部分4 8的板狀體5 2以軸芯5 0爲 心旋轉並攪拌藥液。這裏，如果按照現有技術那樣組裝 φ波板，則即使擺動液體槽筒1 2，由於液體波動被防止， 能獲得充分的攪拌效果。可是，根據本實施方式的粗濾 26，僅僅通過回轉粗濾器26這樣非常簡單的方法，就 以充分地攪拌藥液。這就使得在藥液噴霧作業時起到能 一直噴灑一定濃度的藥液的效果。其中，在該攪拌時， 業人員藉由捏住旋鈕部5 8而能夠更容易地旋轉粗濾器 〇 當攪拌結束後，將蓋帽24螺合在注入口 22上。當 φ上蓋帽24之後，蓋帽24的背面與粗濾器26的筒狀部 3 2的上端面接觸，段差41壓住支援部2 8。其結果，粗 器26被固定於注入口 22，防止在藥液噴霧作業時粗濾 26在注入口 22內發生鬆動。 在當安裝蓋帽24之後進行藥液噴霧作業的情況下 因爲背負式動力噴霧機1 〇由作業人員背負使用，所以 著作業人員的行走，液體槽筒1 2不規則地擺動，液體 筒1 2內的藥液容易産生波動。但是，如果預先將本實 方式的粗濾器26安裝在注入口 22上，則如圖1所示’ 意 液 處 旋 中 消 不 器 可 夠 作 26 裝 分 濾 器 隨 槽 施 由 -14- (12) 1260992 於阻力部分4 8浸入在藥液中，所以，阻力部分4 8對藥液 的流動施以阻力，抑制波動的擴大。更詳細地說’阻力部 分4 8的板狀體5 2相對於圖1所示的穩定狀態時的液體槽 筒12內的藥液的液面，大致呈直角而配置，並且，因爲 六片板狀體5 2被配置成放射狀，所以若液體槽筒1 2內的 藥液前後左右擺動，則其擺動就會被某板狀體52所限制 。因此，在抑制液體的波動同時，也抑制液體槽筒1 2的 φ重心位置的移動，所以，對於背負著背負式動力噴霧機1 〇 的作業人員來說，能夠以穩定的輕鬆姿勢持續作業。 這樣的消波效果乃至重心移動抑制效果’只通過將粗 濾器26安裝在注入口 22上即可獲得。即’僅通過安裝粗 濾器2 6就可以將阻力部分4 8設置在藥液中。因此，如現 有技術中那樣安裝消波板所看到的追加且麻煩的作業就變 得不必要。此外，由於通過取下粗濾器2 6也可以取下阻 力部分48，所以，使更換阻力部分48等的維護作業也變 φ得容易。 其中，當在液體槽筒1 2內的藥液減少的情況下’雖 然整個阻力部分4 8位於比液面更靠上方的位置’但是’ 因爲在此狀態下重心本身也下降到下方、並且重量減輕’ 所以，即使重心前後左右移動，也能夠良好地繼續作業。 以上，對本發明的優選實施方式詳細地進行了說明， 但是本發明並不局限於上述實施方式。 ' 例如，上述實施方式中，雖然作爲背負式動力噴霧機 1 0的液體槽筒用粗濾器2 6來使用’但是也可以將本發明 -15- (13) 1260992 的粗濾器適用於其他裝置中的液體槽筒或者不具有驅動部 的液體槽筒單體上。 此外，阻力部分如果是作爲限制液體移動的障礙物而 工作，則無論哪種構造都可以’除了由板狀體構成的以外 ，也可以是由棒體或者球體等構成的。 而且，上述實施方式中，作爲脫落防止機構的板狀片 56穿過注入口 22的支援部28、28而配置在支援部28的 魯下側。但是，脫落防止機構並不局限於此。例如，在注入 口 2 2的內周形成環狀溝，設置可從筒狀部分3 2的外周面 出沒且向突出方向施加能量的彈性部材，將該彈性部材嵌 入在上述環狀溝內來進行粗濾器的安裝，也能夠以此方式 作爲脫落防止機構。因爲該結構通過將彈性部材嵌入在環 狀溝內，所以，即使沒有段差4 1，也能夠將粗濾器安裝在 注入口。 φ【圖式簡單說明】 圖1是能夠適用本發明的粗濾器的背負式動力噴霧機 的簡要側視圖’部分剖面表不液體槽筒內部。 圖2是安裝有本發明的粗濾器的注入口周邊部的平面 圖。 圖3是從過濾部側看到的本發明的粗濾器的狀態的立 體圖。 圖4是本發明的兩個粗濾器處於重叠狀態、帶有部分 剖面圖的側視圖。 -16- (14) (14)1260992 【主要元件符號說明 10動力噴霧機 12液體槽筒 14驅動泵 16內燃引擎 1 8燃料槽筒 20背負框 2 2注入口 24蓋帽 26粗濾器 28支援部 30間隔 32筒狀部分 3 4過濾部分 36上部 3 8中間部 40下部 4 1段差 42骨部材 44扇狀開口部 4 8阻力部分 50軸芯 5 2板狀體 (15) (15)1260992(1) 1260992 ' IX. Description of the Invention [Technical Field of the Invention] The present invention relates to a liquid tank mounted on a spray machine or a spray machine, and more particularly to a strainer attached to an injection port of a liquid tank. [Prior Art] A liquid tank for storing a liquid Φ body such as a pesticide is mounted on a working machine such as a spray machine or a spray machine. When a work such as a pesticide spray is performed, the liquid in the liquid tank swings, and the center of gravity tends to move and becomes unstable. In particular, in the case of a backpack-type work machine, since it is used in a state of being carried by a worker, it is easy to cause the above problem due to the walking of the worker, etc. In order to solve such a problem, in Japanese Patent Laid-Open No. 2003-2906 A technique for assembling a wave-eliminating plate in a liquid tank is disclosed in the publication No. 1 to No. 1. Since the wave plate is arranged at a right angle with respect to the liquid level of the liquid in the liquid tank in the steady state, resistance is given to the movement when the liquid swings. Thereby, the fluctuation of the liquid is prevented, and the movement of the center of gravity of the liquid tank is reduced. This wave damper plate is composed of a flexible sheet material corresponding to the inner shape of the liquid tank. When the wave-eliminating plate is installed, the wave-eliminating plate is bent and inserted from the injection port of the liquid tank, and is liberated and bent inside. The liberated wave-eliminating plate is attached to the holding convex portion in the liquid tank to be mounted. However, in order to bend the wave-eliminating plate disclosed in Japanese Laid-Open Patent Publication No. Hei. No. 2-2906 1 i into an injection port that can be inserted into the injection port of the liquid tank, it is required to be larger - 4 - (2) 1260992 Force. Further, when the curved wave-eliminating plate is released in the liquid tank, it is necessary to liberate the bending in accordance with the position of the holding convex portion provided in the liquid tank. Therefore, the assembly work of the wave-eliminating plate is cumbersome, and there is a problem that requires operational experience. Similarly, it is difficult to remove the wave baffle from the liquid tank. The present invention has been made to solve such a problem, and a main object thereof is to provide a device capable of suppressing fluctuations in liquid or the like stored in a liquid tank and capable of being easily attached and detached. SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is characterized in that it is a strainer that is detachably mounted on an injection port of a liquid tank, and includes: a cylindrical portion held in the injection port; a filtering portion of the shaped portion; and a cylindrical portion that contacts a predetermined amount of liquid stored in the liquid tank while holding the cylindrical portion in the injection port, and gives a flow of the liquid Take the resistance part of the resistance. * In this configuration, the resistance portion becomes one of the constituent elements of the strainer for the liquid tank. Therefore, the installation of the resistance portion is also completed by mounting the strainer on the injection port of the liquid tank. Thus, the resistance portion disposed in the liquid tank contacts the specific amount of liquid in the liquid tank and gives it resistance. Therefore, fluctuation of the liquid or movement of the center of gravity can be suppressed. Further, it is preferable to have a fall prevention mechanism that restricts the removal of the cylindrical portion from the injection port. This is because, for example, in the case where the liquid having the foaming property is put into the liquid tank, 'although the coarse filter is to be lifted by the bubble generated from the liquid, the lifting mechanism is prevented by the shedding prevention mechanism. It can prevent the strainer from coming out. The cylindrical portion can be rotated about the central axis of the cylindrical portion while being held in the injection port. This is because if the cylindrical portion is rotated, the resistance portion also rotates, so that the liquid in the liquid tank can be stirred. In order to make the rotation operation easy, it is effective to provide a knob portion for rotating the cylindrical portion. Further, the resistance portion may be provided on the end opposite to the open end φ of the tubular portion, and has an outer shape that can be inserted from the open end into the inner space of the tubular portion. With this configuration, in a state where the resistance portion of one strainer is fitted into the inside of the cylindrical portion of the other strainer, a plurality of strainers can be superposed to reduce the space for storage. Various structures can be considered regarding the resistance portion. For example, a simple structure in which a plate-like body is disposed at an end portion on the side opposite to the open end of the tubular portion is preferably completed by attaching the strainer to the injection port Φ of the liquid tank according to the present invention. The setting of the resistance portion toward the inside of the liquid tank. That is, it is not necessary to cumbersomely install and remove the conventional wave-eliminating plate as described above in the liquid tank. Further, due to the resistance portion thus mounted, fluctuations in the liquid or movement of the center of gravity are suppressed, and therefore, there is also an effect of reducing the workmanship using the liquid tank, particularly the backpack working machine. The burden on the operator. [Embodiment] -6- (4) 1260992 Hereinafter, a preferred embodiment of the strainer of the present invention will be described with reference to the accompanying drawings. In the present specification, words such as up and down and height are used as a reference in the state shown in FIG. 1. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side view showing a state in which a knapsack power sprayer to which a strainer of the present invention can be applied is placed in a horizontal plane, and a partial cross section shows the inside of a liquid tank. Here, the dotted line of Fig. 1 is assumed to be the liquid level in the liquid tank. The knapsack power sprayer 10 shown in the drawing includes a liquid φ tank 12 that stores a liquid such as a pesticide, a pump that sucks the liquid in the liquid tank 12, and is pumped to a spray nozzle (not shown). The internal combustion engine 16 that drives the prime mover of the pump 14 and the fuel tank 18 that stores the fuel of the internal combustion engine 16. They are disposed within the piggyback frame 20, and the user carries the piggyback frame 20 to perform the work. The liquid tank 1 2 of the knapsack power sprayer is made of a translucent synthetic resin, and the amount of liquid inside can be confirmed from the outside. An injection port 22 for injecting a liquid into the inner crucible of the liquid tank 1 2 is formed in the upper portion of the liquid tank 12. The injection port 22 is an approximately cylindrical body projecting from the liquid tank 12, and a screw portion is formed on the outer peripheral surface thereof. A cap 24 for closing the injection port 22 is screwed to the screw portion. The injection port 22 of the liquid tank 12 is formed to be detachably attached to the strainer 26 for a liquid tank of the present invention. A support portion 28 that supports the strainer 26 is disposed on the inner peripheral surface of the injection port 22. The support portion 28 is provided at a position below the open end (upper end surface) of the injection port 22, and is formed to protrude radially inward. Further, as shown in FIG. 2 which is a plan view of the peripheral portion of the injection port 2 2, the support portion 28 is disposed so as to be equally divided (5) 1260992 on the same circumference (in the illustrated embodiment, the division is performed. A predetermined interval 30 is formed between the support portions 2 8 and 28 adjacent to each other at four positions. The filter 26 is provided with a cylindrical portion 32 which will be described in detail later, and the tubular member 2 is supported by the support portion 28 to form a state in which the strainer is held. As shown in Fig. 3, the strainer 26 has a cylindrical cylindrical portion 32 which is inserted into the injection port 22, and a filter portion 34 which is provided at the lower end of the cylindrical portion 3 2 and which are integrally formed of synthetic resin. Here, the figure is a perspective view of the strainer 26 of the present embodiment as seen from the side of the filter portion 34. The cylindrical portion 32 is divided into three portions along the axial direction thereof, and the outer diameters of the upper portion 36, the intermediate portion 38, and the lower portion 34 of the upper portion 36 are larger than the outer diameter of the intermediate portion 38 as shown in Figs. 1 and 3, The outer diameter of the outer intermediate portion 38 of the lower portion 40 is small. More specifically, the outer diameter of the intermediate portion 38 is φ diameter formed by the inner edge of the support portion 28 formed on the injection port 22, and the outer diameter of the upper portion 36 is slightly smaller than the open end of the injection port 22 and Greater than the diameter of the above circle. Therefore, if the portion 3 2 is inserted into the injection port 2 2 from the lower portion 4, the lower portion 40 and the intermediate portion: the region surrounded by the support portion 28, the section of the intermediate portion 38 and the upper portion 3 6 The 4 1 is placed on the support unit 28 and is held in a sleek position in the '32' position (see Fig. 1). In this state, since the upper end of the cylindrical portion 32 is opened, liquid can be supplied from the inside into the cylindrical portion 3 2, and the foreign matter contained in the liquid is filtered by the filtering portion 34. The 〇 phase in the rough part approximates the over 3 is the state, that is, the 40 ° diameter ratio is slightly smaller than the outer diameter of the cylindrical 丨 8 piercing between the inlets because of the injection of -8 - (6) 1260992 which, in Figure 1 In the state in which the open end (upper end) of the tubular portion 32 does not protrude upward from the open end of the injection port 2 2, the height of the upper portion 36 of the cylindrical portion 32 is from the upper surface of the support portion 28 Up to the height of the open end of the injection Q 2 2 . Therefore, the cap 24 can be screwed onto the injection port 22 while the strainer 26 is held in the state of the injection port 22. Further, the back surface (the inner side surface of the cap portion 24) screwed to the injection port 22 is configured to contact the upper end surface φ of the cylindrical portion 32 in the holding state, and it is preferable to press the cylindrical portion 32 downward. This is because the tubular portion 32 (i.e., the strainer 26) is fixed in the injection port 22 in a state of being non-rotatable while being sandwiched between the support portion 28 and the cap 24. The filter portion 34 has a plurality of (in the figure, six) bone members 42 that are equally divided into the lower end faces of the cylindrical portion 32 in the circumferential direction, and a plurality of fans divided by the bone members 42 The opening portion 44 and the screen 46 provided on the fan-shaped opening portion 44 and trapping foreign matter contained in the liquid injected into the liquid tank cylinder 12 are captured. It is preferable that the filter portion 34 is provided with a resistance portion 48 ° a resistance portion 4 8 for forming a liquid in the liquid tank 1 2 with a resistance ' with the cylindrical portion 32 and the filter portion 34. The resistance portion 48 in the illustrated embodiment includes a shaft core 50' extending downward from the center point of the filter portion 34, that is, the intersection of the plurality of bone members 4 2 and the cylindrical portion 32, and from the shaft core The plurality of pieces (the six pieces in the illustrated embodiment) which are radially extended are approximately a rectangular plate-like body 52. The plate-like bodies 52 are equally disposed in the circumferential direction, and are respectively coupled to the corresponding bone members 42. For the reason, the plate-like body -9-(7) 1260992 5 2 is provided, and the above-mentioned factors are considered in consideration of the balance at the time of stirring the liquid. Further, the outer edge portion 54 of each of the plate-like members 52 extends upward to a step 55 between the intermediate portion 38 and the lower portion 40, and is joined to the outer peripheral surface of the lower portion 4 of the tubular portion 32. As a result, the rigidity of the plate-like body 52 is improved as compared with the case where only the plate-like body 5 2 is joined to the shaft core 5 〇 and the bone member 42. The length (horizontal dimension) from the central axis of the core 50 to the outer edge portion 514 is equal to or less than the radius of the outer peripheral surface of the intermediate portion 38 of the cylindrical portion 32. This is to allow the resistance portion 48 to be easily inserted into the injection port 22. Further, regarding the height of the resistance portion 48 (the vertical dimension of the plate-like body 52), since the important function of the resistance portion 48 is to subject the flow of the liquid to the resistance, the coarse filter 26 is loaded as shown in FIG. In the state of the inlet 2 2, it is necessary to make at least a part of the resistance portion 48 immersed in a certain amount of liquid in the liquid tank 1 2 . Here, it is to be noted that the strainer 26 of the present embodiment has a configuration in consideration of the overlapping storage state as shown in Fig. 4 . In other words, in the present embodiment, the lower portion 40 and the resistance portion 48 of the cylindrical portion 32 of one strainer 26 can be fitted into the cylindrical portion 32 of the other coarse filter 26 of the same shape in a state where the looseness is relatively small. . In order to obtain such a configuration, simply, the shape and the size may be predetermined such that the lower portion 40 of the cylindrical portion 32 of the strainer 26 and the resistance portion 48 are rotated about the central axis of the cylindrical portion 32. The outer shape of the formed rotating body is substantially the same as the shape defined by the inner peripheral surface and the bottom surface of the cylindrical portion 32. In more detail, the outer diameter of the lower portion 40 of the cylindrical portion 32 is made smaller than the inner diameter of the intermediate portion 38. Further, the length from the center axis of the shaft core 50 of the resistance portion 48 to the outer edge portion 54 of the plate-like body 52 is made larger than the intermediate portion 38 of the cylindrical portion 32. The inner peripheral surface has a slightly smaller radius. Here, since the lower portion of the plate-like body 52 is housed in the reduced diameter lower portion 4 of the cylindrical portion 32, the lower portion of the outer edge portion 504 of the plate-like body 52 is compared with the inner shape of the lower portion 40. It is cut into approximately rectangular shapes. Further, 'the difference from the step 5 5 between the intermediate portion 38 and the lower portion 40 of the cylindrical portion 3 2 to the lower end of the resistance portion 48 (the height of the resistance portion 48) is made to be φ from the cylindrical portion 3 2 The size from the open end to the bottom surface (the depth of the cylindrical portion 32) is the same or smaller. In the present embodiment, the height of the 'resistance portion 48 is made smaller than the depth of the cylindrical portion 32.' The lower end of the intermediate portion 38 of one thickener 26 is embedded in another thick state without looseness. The open end of the filter 26. Therefore, the overlapping strainers 26, 26 can be reliably connected, making handling easy. As shown in Fig. 4, when a plurality of strainers 26 are stacked, the whole is compact, and it is suitable for transportation or storage in connection with space saving. φ Further, the strainer 26 in the present embodiment is provided with a fall prevention mechanism that restricts the upward movement of the strainer 26 from the injection port 22 by moving upward from the injection port 22 of the liquid cartridge 12. In the present embodiment, the plate-like piece 56 is formed to protrude outward from the outer circumferential surface of the intermediate portion 38 of the tubular portion 32 as the fall prevention mechanism. The plate-like piece 56 is substantially the same as the space 30 (see FIG. 2) divided between the support portions 28 and 28 adjacent to the injection port 2 2 _, and the size is made smaller than the interval 30. . Further, the plate-like piece 56 is disposed so as to be spaced downward from the upper portion 36 and the intermediate portion 38 of the cylindrical portion 32 by a predetermined interval which is formed as a support portion -11 than the injection port 2 2 - (9) 1260992 28 has a large thickness. Therefore, when the strainer 26 is loaded onto the injection port 22, if the plate-like piece 56 is passed between the support portions 28, 28, and the strainer 26 is rotated about its central axis, the plate-like piece 5 6 can be placed under the support unit 28, and in this state, the upward movement of the strainer 26 is restricted. It suffices that at least one of the plate-like sheets 56 is provided, but it is preferably the same as the number of intervals of 30, that is, four are provided. Further, in the strainer 26, a knob portion 58 (see Fig. 1) is provided in order to facilitate the φ rotation of the rotation about the axis. The knob portion 58 shown in the figure protrudes radially inward from the inner circumferential surface of the upper portion 36 of the cylindrical portion 3 2 and has a plate shape extending in the axial direction, and at least one is provided, and a plurality of them are preferably provided. Here, in order to vertically store the plurality of strainers 2 as shown in Fig. 4, the inner edge of the knob portion 58 is disposed outward in the diameter direction from the inner peripheral surface of the intermediate portion 38 of the cylindrical portion 32. Further, in order to enable the lower end of the intermediate portion 38 of one strainer 26 to be fitted to the open end of the cylindrical portion 32 of the other strainer 26, the upper end of the knob portion 58 is located closer to the open end of the cylindrical portion 32. The φ position on the lower side. Next, a method of mounting the strainer 26 of the above configuration on the injection port 2 2 of the liquid tank 1 2 and the action of the strainer 26 to produce a specific concentration in the liquid tank 1 2 from the concentrated chemical solution The case of the chemical solution is assumed to be explained. First, the cap 24 is removed from the injection port 22 of the liquid tank 12, and then a predetermined amount of concentrated chemical is metered from the inlet 22 before the strainer 26 is installed. After the input of the concentrated chemical solution is completed, the strainer 26 is mounted on the injection port 22 of the liquid tank 12. When the strainer 26 is installed, -12-(10) 1260992 is inserted into the injection port 22 in the order of the resistance portion 48 of the strainer 26, the filtering portion 34, and the cylindrical portion 32. When the cylindrical portion 3 2 is inserted, the tubular portion 3 2 is rotated about its axis, and the plate-like piece 56 as the fall prevention mechanism is adjusted between the support portions 28, 28 at the injection port 2 2 The position of interval 3 0. After the position is adjusted, the plate piece 56 is passed through the space 30. If the tubular portion 3 2 is continuously inserted in this manner, the step 4 1 of the tubular portion 3 2 is hung on the support portion 28, and the strainer 26 is supported. Since this state is only a state in which the φ step 41 is placed on the support portion 28, the strainer 26 can be freely rotated. Then, the cylindrical portion 3 2 is rotated to shift the position of the plate-like piece 56 with respect to the space 30. This rotation operation can be easily performed by using the knob portion 58. The plate-like piece 56 is positioned below the support portion 28 by the rotation of the tubular portion 32. In this state, even if the strainer 2 is pulled upward, since the plate-like piece 56 is blocked by the support portion 28, the further upward movement is also restricted. Thus, when the strainer 26 is installed at the injection port 22, water for diluting the concentrated chemical solution to a predetermined concentration is injected from the open end of the coarse filter φ26. The component of the injected water is confirmed by comparing the external liquid level from the translucent liquid tank 12 to the scale engraved on the liquid tank 12, and the like. Further, foreign matter contained in the water is caught by the filter portion 34 of the strainer 26 to prevent foreign matter from entering the liquid tank 1 2 . In the case where the chemical liquid in the liquid tank 1 2 has foaming properties, bubbles are generated by the injection of water, and the force for pushing the strainer 26 upward is generated. However, as described above, the plate-like piece 5 6 is provided on the strainer 26 of the present embodiment because it is disposed directly below the support portion 28, so the thick-13-(11) 1260992 filter 26 does not Note the inlet 2 2 out. Therefore, the operator does not need to be in the position of the strainer 26, and can concentrate on the injection of water. If the injected water exceeds a certain amount, the position of the dotted line of Fig. 1 indicating the surface of the chemical solution (liquid) is the state in which the resistance portion 48 of the strainer 26 is immersed in the chemical liquid in the liquid tank 12. When the coarse filter 26 is rotated in this state, the plate-like body 52 of the resistance portion 48 is rotated about the core 50 and the chemical is stirred. Here, if the φ wave plate is assembled as in the prior art, even if the liquid tank 1 2 is swung, since the liquid fluctuation is prevented, a sufficient stirring effect can be obtained. However, according to the coarse filter 26 of the present embodiment, the chemical liquid is sufficiently stirred only by a very simple method of rotating the coarse filter 26. This makes it possible to spray a certain concentration of the drug solution all the time during the spraying of the drug solution. Here, at the time of the stirring, the operator can more easily rotate the strainer by pinching the knob portion 58. When the stirring is completed, the cap 24 is screwed onto the injection port 22. After the φ upper cap 24, the back surface of the cap 24 comes into contact with the upper end surface of the cylindrical portion 32 of the strainer 26, and the step 41 presses the support portion 28. As a result, the coarser 26 is fixed to the injection port 22 to prevent loosening of the coarse filter 26 in the injection port 22 during the chemical spraying operation. In the case where the chemical spray operation is performed after the cap 24 is installed, since the knapsack power sprayer 1 is used by the operator, the worker's walking, the liquid tank 12 is irregularly oscillated, and the liquid cartridge 12 is inside. The liquid medicine is prone to fluctuations. However, if the strainer 26 of the present embodiment is installed on the injection port 22 in advance, as shown in Fig. 1, the liquid in the middle of the liquid can be used as a 26-pack filter to be applied with the tank -14- (12 1260992 is immersed in the chemical solution at the resistance portion 48, so the resistance portion 48 applies a resistance to the flow of the chemical solution to suppress the expansion of the fluctuation. More specifically, the plate-like body 52 of the resistance portion 48 is disposed at a substantially right angle with respect to the liquid surface of the chemical liquid in the liquid tank 12 in the steady state shown in Fig. 1, and because of the six plates Since the body 52 is arranged in a radial shape, if the liquid medicine in the liquid tank 12 is swung back and forth, the swing is restricted by the plate body 52. Therefore, while suppressing the fluctuation of the liquid, the movement of the position of the center of gravity of the liquid tank 1 2 is also suppressed. Therefore, the worker who is carrying the knapsack power sprayer 1 can continue the work in a stable and relaxed posture. Such a wave-eliminating effect and even a center-of-gravity movement suppressing effect can be obtained only by attaching the coarse filter 26 to the injection port 22. That is, the resistance portion 48 can be placed in the chemical solution only by installing the coarse filter 26. Therefore, the additional and troublesome work seen by installing the wave eliminator as in the prior art becomes unnecessary. Further, since the resist portion 48 can be removed by removing the strainer 26, the maintenance work for replacing the resistance portion 48 and the like can be made φ easy. Wherein, when the liquid medicine in the liquid tank 12 is reduced, the entire resistance portion 48 is located at a position higher than the liquid surface 'but' because the center of gravity itself is lowered to the lower side and the weight is in this state. Reduced' Therefore, even if the center of gravity moves back and forth, it is possible to continue the work well. The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments. For example, in the above embodiment, the liquid strainer for the knapsack power sprayer 10 is used as the strainer 26 for the liquid drum. However, the strainer of the present invention -15-(13) 1260992 can also be applied to other devices. The liquid tank or the liquid tank unit without the driving portion. Further, if the resistance portion is operated as an obstacle for restricting the movement of the liquid, any structure may be formed by a rod or a sphere or the like in addition to the plate-like body. Further, in the above-described embodiment, the plate-like piece 56 as the fall prevention means passes through the support portions 28, 28 of the injection port 22, and is disposed on the lower side of the support portion 28. However, the fall prevention mechanism is not limited to this. For example, an annular groove is formed on the inner circumference of the injection port 22, and an elastic member that can be extracted from the outer circumferential surface of the cylindrical portion 32 and that applies energy to the protruding direction is provided, and the elastic member is fitted into the annular groove. The installation of the strainer can also be used as a fall prevention mechanism in this way. Since the structure is embedded in the annular groove by the elastic member, the strainer can be attached to the injection port even without the step 4 1. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side view of a knapsack power sprayer to which the strainer of the present invention can be applied. Fig. 2 is a plan view showing a peripheral portion of an injection port to which the strainer of the present invention is attached. Fig. 3 is a perspective view showing the state of the strainer of the present invention as seen from the side of the filter unit. Figure 4 is a side elevational view, partially in section, of the two strainers of the present invention in an overlapping state. -16- (14) (14)1260992 [Main component code description 10 Power sprayer 12 Liquid tank 14 Drive pump 16 Internal combustion engine 1 8 Fuel tank 20 Carrying frame 2 2 Injection port 24 Cap 26 Main filter 28 Support 30 interval 32 cylindrical portion 3 4 filter portion 36 upper portion 3 8 intermediate portion 40 lower portion 4 1 step difference 42 bone member 44 fan-shaped opening portion 4 8 resistance portion 50 shaft core 5 2 plate-shaped body (15) (15) 1260992
54外側邊緣部 55段差 5 6板狀片 5 8旋鈕部 -18-54 outer edge portion 55 step difference 5 6 plate piece 5 8 knob section -18-