[實施形態1] 以下，對本發明之實施形態詳細地進行說明。再者，於本實施形態中，雖作為流體而以水為一例進行說明，但並非限定於水。 (噴嘴之概要) 圖2係用於說明噴嘴1整體之概略之圖，圖3係表示圖2之AA線箭視剖視圖之圖。 如圖2及圖3所示，噴嘴1包含一端封閉而另一端敞開之圓筒狀之殼體1a，於殼體1a之封閉側之端部，形成用於噴出流體之噴出口11，且於敞開側之端部，形成用於將水(流體)導入至噴嘴1內之開口部12。該開口部12連接於例如攜帶型洗淨裝置之本體。再者，本實施形態中雖省略關於攜帶型洗淨裝置之細節，但於下述之實施形態3中將對攜帶型洗淨裝置進行說明。 (噴嘴之噴出口之形狀) 如圖1所示，噴嘴1之噴出口11包含第1開口區域11a、第2開口區域11b、第3開口區域11c、第4開口區域11d、第1連接區域11e、第2連接區域11f、第3連接區域11g；藉由第1連接區域11e連接第1開口區域11a與第2開口區域11b，第2連接區域11f連接第1開口區域11a與第3開口區域11c，第3連接區域11g連接第1開口區域11a與第4開口區域11d，而形成一個開口區域。此處，於本實施形態中，噴出口11之第1開口區域11a為直徑0.74 mm左右之大致圓形狀，第2開口區域11b、第3開口區域11c為直徑0.5 mm左右之大致圓形狀，第4開口區域11d為直徑0.3 mm左右之大致圓形狀。再者，上述各開口區域之尺寸僅為一例而並非限定於該等數值。 於俯視上述噴出口11時，構成噴出口11之上述各區域之中，第1開口區域11a之開口面積最廣(最大)，配置於該噴出口11之周圍之第2開口區域11b、第3開口區域11c、第4開口區域11d其開口面積均較該第1開口區域11a小。因此，噴出口11之開口區域成為於3個部位收縮之形狀。圖1中之符號K表示噴出口11之開口區域之3個部位之收縮。 (自噴嘴1噴出之流體之行為) 接下來，對於自圖1所示之開口形狀之噴嘴1噴出之水之行為，以下一面參照圖4～圖7，一面進行說明。 自噴嘴1之噴出口11噴出之水係如圖4所示，雖於剛噴出後為一體狀，但隨時間經過而分離成較大之團(相當於第1開口區域11a)與較小之團(相當於第2開口區域11b、第3開口區域11c、第4開口區域11d)，且較大之團最先噴灑至對象物。 即，如圖5所示，於自噴出口11噴出水時，根據水之黏性與表面張力之關係(平衡)，較窄之部分(第2開口區域11b、第3開口區域11c、第4開口區域11d)係因潤濕緣相對於開口區域之面積之長度較長，噴出口11壁面之黏性阻力較大，故水難以通過，又，因與表面張力之平衡而容易殘留水。另一方面，較寬之部分(第1開口區域11a)係因相對於開口區域之面積潤濕緣之長度較短，噴出口11壁面之黏性阻力較小，故水容易通過，又，因與表面張力之平衡而不易殘留水。 因此，於噴出口11中，較寬之部分係先於較窄之部分而出水，較窄之部分則略遲於較寬之部分而出水。即，自較寬之部分以強勁之水勢噴出水，自較窄之部分略遲噴出水。因此，於所噴出之水面，在同一面內出現壓力之不均勻時，吸入口之較窄之部分(符號K之收縮部)之壓力低於較寬之部分之壓力，故自較窄之部分吸引空氣，空氣以填隙之形式進入至水流中。因此，於噴出具有收縮形狀之1個較大之團後，水團立即被所吸取之空氣暫時從中截斷。被從中截斷之水團此次因表面張力，自連結部分脫出之部位逐漸收縮，並最終形成空氣之空間而分離成球狀(參照圖4之Y及圖6)。 如圖6所示，就噴出口11之形狀而言，自較寬之部分噴出之水成為先行行進之較大之水滴L1，自較窄之部分噴出之水分離成略遲於其而行進之較小之水滴(L2、L3、L4)。此處，水滴L1對應自第1開口區域11a噴出之水，水滴L2對應自第2開口區域11b噴出之水，水滴L3對應自第3開口區域11c噴出之水，水滴L4對應自第4開口區域11d噴出之水。且，水滴L1～L4係如圖4所示按照團之由大至小之順序移動至對象物。 如圖7所示，最先到達至對象物者為最大之團之水滴L1。繼而，水滴L2、L3、L4依序到達至對象物。如此，自噴出口11噴出之水於噴出後成為分離之較大之水滴與較小之水滴，該等水滴依序噴灑至洗淨之對象物，各水滴之噴灑時序錯開。如此，若水滴L1噴灑至對象物，則該水滴L1之動能轉換為碰撞能。 (洗淨機制) 對水噴灑至對象物而進行洗淨之裝置進行詳細敍述。 水之動能(E=1/2 mv2
)係於撞擊對象物之時點轉換為衝量(E=FΔt)。物體之動量之變化係與此間所承受之衝量相等。此處，m表示水量，v表示水之速度，Δt表示水撞擊對象物而消散所耗費之時間，F表示水碰撞對象物之力(洗淨力)。 此處，若欲自相同之面積噴出2倍體積之水，則速度v成為2倍，能E成為4倍。即，若為相同水量(m)，則速度v越快，動能E亦越高。 進而，若水之動能E相同，則Δt越短，則碰撞力F(洗淨力)越強。Δt由於為水撞擊對象物而消散所耗費之時間，故於連續流中變長，於不連續之水流(脈動流)中變短。即，若水之動能E相同，則脈動流之洗淨力F較連續流之洗淨力F強。 因此，動能E較高且撞擊對象物之時點之洗淨力F較強之水滴係因碰撞對象物時勢頭強勁地綻開，故洗淨面積擴大。 (洗淨性能之比較) 此處，比較自噴嘴噴出之水流為連續流之情形與為不連續流(脈動流)之情形時之洗淨性能。 圖8之(a)表示自包含複數個較小之孔之噴出口a噴出之水之行為，圖8之(b)表示自包含一個圓形狀之孔之噴出口b噴出之水之行為，圖8之(c)表示自包含開口區域之3個部位收縮之一個孔之噴出口c(相當於本實施形態之噴嘴1之噴出口11)噴出之水之行為。再者，因噴出口a～c雖開口形狀不同但開口面積相同，故自噴出口a～c噴出之水之量(水量(m))亦相同。 噴出口a因由複數個較小之孔組成，故噴出多條較細且連續之水(連續流)。於該情形時，因各水流較細，故空氣阻力與重力之影響變大，水之飛濺變得激烈。如此，因水之飛濺較多，故產生水難以噴灑至對象物之問題。又，即便於水已噴灑至對象物之情形時，連續流因其Δt較長，故仍產生洗淨力F較弱之問題。 噴出口b因由一個圓形狀之孔組成，故噴出一條面積較寬且連續之水(連續流)。於該情形時，因水流較噴出口a粗，故水大範圍地噴灑至對象物，因此量感較高(面積較寬)，但與噴出口a同樣地，連續流因其Δt較長，故產生洗淨力F較弱之問題。 噴出口c因由開口區域之3個部位收縮而成之一個孔組成，故窄的部分係因相對於面積而言潤濕邊長度較長，故噴出口壁面之黏性阻力較大，寬的部分因潤濕邊長度較短，噴出口壁面之黏性阻力較小，故寬的部分較窄的部分先出水。藉此，大小不同之水珠不連續地噴出複數個，而成為脈動流。 因此，因與於大範圍地配置若干條自較小之孔噴出之連續流之噴出口a相較，噴出口c能夠使水滴增大，故相對於水滴之體積、重量而言水滴之表面積較小，因此，可使空氣阻力之影響相對小於重力影響，因此可大幅減少水之飛濺。又，可維持直至撞擊對象物為止之水勢，可抑制水壓之降低。 且，雖由於開口面積相同，故自噴出口a～c噴出之水量m相同，但因於噴出口c係於剛噴出後便已一面吸入空氣一面噴出，故與在噴出時一面吸入周圍之空氣一面噴出之量相應地，各水滴之速度上升，且因Δt極短，故水滴之動能E變高，且洗淨力F亦增強。且，因自寬的部分噴出之水滴之動能E變高，故水滴對於對象物以較強之力綻開，使水噴灑至大範圍，故與噴出口b同樣地亦獲得量感。再者，能夠藉由對噴出口11之開口區域之形狀進行各種設計而調整量感。 如以上般，噴出口c係僅藉由設計該噴出口c之開口形狀，無需使用特殊之壓力產生機構等複雜之機構，便能夠形成對提高洗淨性能極有利之不連續之水流即所謂脈動流。 因此，根據本實施形態之噴嘴1，其係不會因追加複雜之構成而造成成本上升之極簡單之構成，且亦不存在水之無益之飛濺，能夠兼顧量感提昇與水壓提昇而獲得較高之洗淨力。如此，若使用能夠兼顧量感提昇與水壓提昇而獲得較高之洗淨力之噴嘴1，則亦能夠謀求對象物之洗淨時間之縮短及節水性能之提高。 (其他噴嘴) 圖9所示之噴嘴101具有與圖1所示之噴嘴1之噴出口11之形狀不同之噴出口21。 噴出口21係水之噴出側之開口21a之面積，較來自開口部22之水之導入側之開口21b之面積小。即，噴出口21成為開口朝水之噴出方向縮窄之形狀。藉此，能夠提高自噴出口21噴出之水之壓力，加快水噴出之速度v。因此，能夠提高水之動能E而提高洗淨強度。 圖10所示之噴嘴102亦與圖9所示之噴嘴101同樣地，具有與圖1所示之噴嘴1之噴出口11之形狀不同之噴出口23。 噴出口23係如圖10所示，具有斜向傾斜之內壁面23a。根據該構成，其成為水之噴出方向(角度)之導向面而能夠向穩定之方向噴出水。又，能夠藉由朝向洗淨對象物之局部之方向斜向噴出而進一步提高洗淨性能。 例如，於將圖10所示之噴嘴102用於攜帶式臀部洗淨器之情形時，雖使用者根據自前側(腹側)接近洗淨對象物之局部或自後側(背側)接近局部，為使水適當地噴射至局部而只要改變手持角度即可，但必須對手腕施加負擔或於扭轉手腕之狀態下維持身姿。若如圖10所示之噴嘴102，使用噴出口23具有斜向傾斜之內壁面23a之噴嘴102，則能夠採取藉由改變噴嘴102前端之角度而變更水流之噴出方向的應對方法。即，以於自前側接近之情形時朝近前傾斜，於自臀部側接近之情形時與之相反地傾斜之方式，形成噴出口23之內壁面23a即可。於此種情形時，亦可預先準備內壁面23a之傾斜方向相反之2種噴嘴，根據使用目的而更替噴嘴。 又，因自噴嘴101、102噴出之水為球狀之不連續流(脈動流)，故若使水滴之大小多樣化，則自斜向傾斜之噴嘴噴出之各水滴之到達距離不同而描繪出各自之拋物線。即，亦能夠藉由調整水滴之大小而使到達距離不同之水滴大範圍地灑落。因此，能夠跨及大範圍且較少飛濺地將洗淨對象物洗淨。 於本實施形態中，對在噴嘴1之噴出口11以包圍較寬之部分(第1開口區域11a)之方式設置3個較窄之部分(第2開口區域11b、第3開口區域11c、第4開口區域11d)之例進行說明。此處，能夠藉由調整以包圍較寬之部分之方式設置之較窄之部分之數量而調整於大團之水滴之後接續而至之小團之水滴之數量。以下，對取得與噴嘴1相同之效果之其他噴嘴之噴出口之開口區域之例進行說明。 (噴出口之形狀之例) 於本實施形態中，作為噴出口之形狀，不僅可為圖1所示之噴出口11，亦可為其他形狀。即，於噴出口之開口區域之至少1個部位形成收縮部即可。進而，較佳為，由至少2個開口部構成噴出口之開口區域，且一開口部之開口面積與另一開口部之開口面積不同。即，較佳為，噴出口之開口區域包含至少1個較寬之部分及至少1個較窄之部分。 例如，於圖11中，示出組合有較寬之部分、較窄之部分之各式噴出口，但因均係噴出口之開口區域包含至少1個較寬之部分及至少1個較窄之部分，故取得與圖1之噴嘴1相同之作用效果。 再者，圖11之(a)～(f)所示之形狀之噴出口中之開口區域之周緣僅由平滑之曲線形成的圖11之(c)～(f)所示之形狀之噴出口取得如下效果。 由於開口區域之周緣僅由平滑之曲線形成，故不存在成為自噴出口噴出水時之阻力而阻礙流動之情形，能夠獲得上述之效果。藉此，相較於非平滑地形成之情形(圖11之(a)、(b))，無需提高泵等之性能便能夠抑制流速之降低，而取得洗淨性能更有效率地提高之效果。 (噴嘴之應用例) 如噴嘴1般，藉由在噴出口11以包圍較寬之部分(第1開口區域11a)之方式設置複數個較窄之部分(第2開口區域11b、第3開口區域11c、第4開口區域11d)，能夠產生不連續之水滴。藉此，自噴出口11噴出之水成為具有大、小、小、小、大、小、小、小等規律之規律性水流。若使具有此種規律之水噴灑至對象，則能夠獲得對於對象進行按摩之效果。如此，所噴出之水之規律係根據形成於較寬之部分之周圍之較窄之部分之數量而進行調整。例如，於浴廁中，以成為對臀部洗淨而言較佳之水量與頻率之方式，設定較窄之部分之數量，或以成為對淋浴噴嘴而言較佳之水量與頻率之方式，設定較窄之部分之數量，亦或根據各種洗淨形態之特性而設定較窄之部分之數量。又例如，藉由在洗衣機中，大小不一之水產生撞擊，亦能夠獲得相同大小之水滴持續撞擊之情形時無法獲得之「鬆解」之效果。該情形時，亦與臀部洗淨之情形同樣地，以成為對洗淨而言較佳之水量與水滴之大小之方式設定較窄之部分之數量，或以對洗淨模式而言較佳之方式設定較窄之部分之數量，亦或根據各種洗淨形態之特性而設定較窄之部分之數量。因此，根據各設定將噴嘴設為可變(較窄之部分之數量可變)，或更替噴嘴(針對較窄之部分之每種數量而設置之噴嘴之更換)即可。 於本實施形態中，已對噴嘴1係設計噴出口11自身之形狀(內壁部等)而使所噴出之水流成為脈動流之例進行說明，但本發明並非限定於該等，亦可不變更噴出口之內壁部，而形成遮蔽開口區域之至少一部分之遮蔽部，以此方式使水流成為脈動流。對於該例，將於以下之實施形態2進行說明。 [實施形態2] 若對本發明之其他實施形態進行說明，則如下所述。再者，為便於說明，對具有與在上述實施形態所說明之構件相同功能之構件標註相同之符號，並省略其說明。 (噴嘴之噴出口形狀) 如圖12所示，本實施形態之噴嘴之噴出口51係以3個遮蔽部52～54自直徑R之圓形狀之開口孔51a之側緣向中心突出之方式形成。藉此，噴嘴之噴出口51成為以下之構成，即凸狀地覆蓋上述開口孔51a之一部分而形成開口面積較開口孔51a小之開口51b，阻礙自該開口孔51a噴出之水之水流之一部分。上述開口51b之開口形狀係以與上述實施形態1之噴出口11之開口形狀相同之方式形成有3個收縮部。 此處，於本實施形態中，自直徑R=1.85 mm之開口孔51a，由3個凸狀之遮蔽部52～54遮斷水之水流。遮蔽部52、54係突出方向(最大長度)0.4 mm×長度方向(最大長度)1.4 mm、管截面積為0.37 mm2
、潤濕緣長度為3.54 mm左右。遮蔽部53係突出方向(最大長度)0.66 mm×長度方向(最大長度)1.0 mm、管截面積為0.45 m2
、潤濕緣長度為3.47 mm左右。 因此，表示本實施形態之代表性之長度之等效水力直徑分別為(等效水力直徑d=4A/L←A：管截面積、L：潤濕緣長度) d1=(4×0.37/3.54)=0.41 d2=(4×0.45/3.47)=0.51 剖面之凹部(凹穴)之寬度W與深度D之縱橫比W/D如下。 W1/D1(圖12中之開口51b之上側之區域)=0.5/0.65=0.77 W2/D2(圖12中之開口51b之左右之區域)=0.53/0.66=0.8 此處，較理想為，剖面之凹部之寬度W與深度D之縱橫比W/D為1以上，如上述般，為0.5以上便能夠顯現效果。即，凹陷較深時效果較大，若凹陷較淺，則效果較弱。 再者，能夠藉由增大液體之表面張力或使噴出口之壁面之潤濕性變差，即成為疏水性或撥水性，而更減小吹出口形狀之上述縱橫比W/D，縮短潤濕緣長度，能夠增大等效水力直徑。此處，能夠表述為等效水力直徑d=4A/L(A：管截面積、L：潤濕緣長度(表示流路之代表長度))。因此，等效水力直徑越大，則噴出口之壓損越小，故能夠降低損耗，能夠減低吹出水之能量。即，即便凹陷較淺，但若為表面張力較高之液體或潤濕性較差之壁面，則效果亦較高。 如此，於自噴出口51噴出水時，根據水之黏性與表面張力之關係(平衡)，於藉由凸形狀之遮蔽部52～54之遮覆而阻礙水之水流地形成之開口51b中，中心之區域(較寬之部分)因潤濕緣之相對於面積之長度較短，吹出口壁面之黏性阻力較小，故水容易通過，周邊之3個區域(較窄之部分)因潤濕緣之相對於面積之長度較長，噴出口之壁面之黏性阻力較大，故水難以通過。因此，較寬之部分係先於較窄之部分而出水。較窄之部分略遲於較寬之部分而出水。即，自較寬之部分勢頭強勁地噴出水，自較窄之部分略遲而噴出水。 再者，上述之剖面之凹部之寬度W與深度D之縱橫比W/D表示流體為水之情形時之數值，於水以外之流體之情形時，根據該流體之特性，數值發生變化。 又，本實施形態之噴嘴係遮蔽部以將阻礙水之水流之一部分之部位斜向縮窄之方式傾斜地形成。根據該構成，藉由一面縮窄一面斜向傾斜，更能夠向目標方向噴出。 (噴出口之形狀之例) 於本實施形態中，作為噴出口之形狀，並非僅為圖12所示之噴出口51，而亦可為其他形狀。即，在噴出口之開口孔，於至少一部位形成遮蔽部即可。 例如，可如圖13之(a)所示，於圓形之開口孔形成一個遮蔽部，亦可如該圖之(b)所示，於圓形之開口孔形成2個遮蔽部。又，可如圖13之(c)所示，於四角形之開口孔形成一個遮蔽部，亦可如該圖之(d)所示，於橢圓形之開口孔形成2個遮蔽部。 任一開口孔之形狀均係與上述實施形態1同樣地，能夠使所噴出之水成為脈動流。 如以上般，於上述實施形態1、2中，為使自噴出口噴出之水成為脈動流，在噴出口之開口區域必須存在壓力不同之區域。即，藉由提高開口區域之中心部之壓力且降低中心部之周圍之壓力，而利用該壓力差使水分離為較大之團與較小之團而成為脈動流。為產生形成該脈動流所需之壓力差，對噴嘴之噴出口之開口區域之形狀進行設計。因此，只要能夠產生形成脈動流所需之壓力差，則噴嘴之噴出口之開口區域之形狀可設為任意之形狀。且，若考慮自負壓部分吸引空氣而產生脈動流，則較理想為在較窄之部分，容易將水流截斷。即，更理想為，於較寬之部分與另一較寬之部分之間設置較窄之部分之形狀。 又，實施形態1、2中所揭示之噴嘴能夠應用於美容機器、或洗淨機器、或者噴射裝置、洗衣機等。又，關於用於自噴嘴噴出之流體輸送手段，能夠以活塞方式、螺旋方式、泵或馬達等各種方式使用。 於以下之實施形態中，對將本發明之噴嘴應用於攜帶型洗淨器(攜帶型臀部洗淨器)之例進行說明。 [實施形態3] 若對本發明之其他實施形態進行說明，則如下所述。再者，為便於說明，對具有與在上述實施形態中所說明之構件相同之功能之構件標註相同之符號，並省略其說明。 於本實施形態中，對將本發明之攜帶型洗淨器應用於洗淨對象為人之臀部之攜帶用臀部洗淨器之例進行說明。 圖14之(a)(b)係表示本實施形態之攜帶用臀部洗淨器100之概略構成之立體圖。 (攜帶用臀部洗淨器100之概略說明) 攜帶用臀部洗淨器100係對洗淨對象(臀部)噴吐洗淨水而洗淨該洗淨對象之洗淨器。攜帶用臀部洗淨器100如圖14之(a)所示，其包含貯存洗淨水之貯槽2、形成有用於對洗淨對象噴吐洗淨水之通常洗淨用之噴出口11之噴嘴1、用於將貯存於貯槽2之洗淨水供給至噴嘴1之本體(流體噴出裝置)3、及滑動自如地設置於噴嘴1且構成使用貯槽2之洗淨水洗淨噴嘴1之噴嘴之自潔機構之構成要素之一的外筒4(滑動構件)。 貯槽2包含表面形成為剖面大致八角形狀(一例)而內表面形成為剖面大致真圓形狀之筒狀之殼體2a，具有用於在殼體2a之內部2b貯存洗淨水之貯存空間。該貯槽2之內部2b之貯存空間係若將洗淨水排出則如圖14(b)所示，成為收納本體3之收納空間。 本體3能夠收納地設置於貯槽2之內部2b，且由表面為剖面大致真圓狀之筒狀之殼體3a覆蓋作為內置之洗淨水供給部之隔膜泵32等(圖3)。於殼體3a之表面，設置有用於操作攜帶用臀部洗淨器100之操作按鈕群31。關於操作按鈕群31，雖未圖示，但設置有用於執行進行洗淨對象(臀部)之洗淨之通常洗淨(通常洗淨模式)之執行和停止之按鈕、用於執行用於洗淨噴嘴1本體之噴嘴洗淨(噴嘴洗淨模式)之執行和停止之按鈕、及洗淨時之水量設定之按鈕等各種操作按鈕。但，對於上述通常洗淨及噴嘴洗淨，亦可不進行按鈕操作，而是以某些信號為觸發而自動進行。 貯槽2之內部2b之縱深係設定為與本體3之長度方向之長度相同或略長。且，本體3之殼體3a係以外徑與上述貯槽2之殼體2a之內表面之內徑相同或略小之方式形成。藉此，本體3係如圖14之(b)所示，完全收納於貯槽2之內部2b。此時，噴嘴1收納於本體3。 如此，本體3係於攜帶時成為收納於貯槽2之內部2b之狀態，於使用時成為至少自貯槽2之內部2b被拉出至形成於殼體3a上之操作按鈕群31露出為止，於該位置固定於貯槽2之狀態。 (本體3之細節) 圖15表示本體3之概略構成立體圖。再者，於圖15中，為便於說明而省略圖14之(a)所示之殼體3a。 本體3具備作為洗淨水供給部之隔膜泵32、一端連接於隔膜泵32之排水口而另一端連接於噴嘴1之排水管33、一端連接於隔膜泵32之吸水口而另一端連接於止回閥35之吸水管34、用於吸入來自貯槽2(圖2之(a)等)之洗淨水之吸水口36、作為電池收納部(未圖示)之蓋之電池蓋37、及形成於本體3之與貯槽2之連接部之外周面之橡膠襯墊38。再者，電池蓋37係藉由封閉電池收納部而實現防水功能。又，藉由橡膠襯墊38，實現本體3與貯槽2之連接部分之防水功能。 止回閥35係一端連接於吸水管34而另一端連接於吸水口36，其使來自吸水口36之洗淨水流入至吸水管34，且不使來自吸水管34之洗淨水流入至吸水口36。即，來自貯槽2之洗淨水係由吸水口36吸取，並通過止回閥35而輸送至吸水管34，但自吸水管34逆流之洗淨水被止回閥35攔截而無法流入至吸水口36。 因此，若隔膜泵32作動，則貯槽2之洗淨水自吸水口36經由止回閥35而藉由吸水管34吸取至該隔膜泵32內部，且自隔膜泵32之排水口通過排水管33而被排水至噴嘴1。 以如此之方式，自本體3對噴嘴1供給洗淨水。被供給有洗淨水之噴嘴1自噴出口11噴吐洗淨水。 噴嘴1能夠裝卸，亦能夠根據使用者之選擇自由更換。 (噴嘴形狀之細節) 本實施形態之噴嘴1成為與在上述實施形態1或2中所說明之噴出口11、噴出口51之開口形狀同樣地，具有寬的部分、窄的部分及擔負連結寬的部分與窄的部分之作用之連結部分之構成。 再者，本實施形態中所說明之噴嘴1係除噴出口11或噴出口51外，亦設置有2個圓形之噴出口。自該等2個圓形之噴出口噴出連續而較弱之水流。根據該構成，亦可同時產生強勁之水流與較弱之水流。如此，對於噴嘴之噴出口之形狀或個數，較佳為根據洗淨對象物而設定。 (效果) 根據上述構成之攜帶用臀部洗淨器100，因自噴嘴1噴出之洗淨水成為脈動流，故對於洗淨對象物之局部，能夠兼顧洗淨水壓與洗淨面積(量感)。又，藉由製出較大之水團，亦可獲得洗淨面積(量感)，故可藉由脈動流與水團之大小提高洗淨水壓與洗淨面積之兩者。此外，於脈動流之情形時，因直至噴灑對象物為止洗淨水不擴散，故洗淨水容易噴灑至目標範圍，且亦不易出現洗淨水之無益之飛濺。 因此，上述構成之攜帶用臀部洗淨機係不會因追加複雜之構成而引起成本上升之極簡單之構成，且取得如下效果，即，亦不存在洗淨水之無益之飛濺，能夠兼顧量感提昇與水壓提昇而獲得較高之洗淨力，此外，能夠謀求洗淨時間之縮短及節水性能之提高。 [實施形態4](洗衣機) 若對本發明之其他實施形態進行說明，則如下所述。再者，為便於說明，對具有與在上述實施形態所說明之構件相同之功能之構件標註相同之符號，並省略其說明。 於本實施形態中，對將本發明之噴嘴應用於洗衣機之供水噴嘴之例進行說明。 (洗衣機之概要) 圖16係表示作為本實施形態之洗衣機之一例之滾筒式洗衣機之外觀之概略立體圖。 上述滾筒式洗衣機具備於前面部具有外箱開口部211之外箱201。於該外箱201之前面部，將開閉外箱開口部211之門202以能夠藉由鉸鏈而朝左右方向轉動地予以安裝。又，於外箱201之前面部之上部，設置有操作顯示部212。使用者係藉由操作操作顯示部212而選擇所期望之洗滌進程。又，操作顯示部212顯示例如洗滌進程之剩餘時間等。 圖17係用於說明上述滾筒式洗衣機之構成之模式剖視圖。 上述滾筒式洗衣機具備配置於外箱201內之有底筒形狀之水槽203、能夠旋轉地配置於該水槽203內之有底圓筒形狀之滾筒(旋轉槽)204、及安裝於水槽203之後部之馬達205。再者，滾筒204係旋轉槽之一例。 於上述外箱201內設置有供水管213。該供水管213之一端部具有供水口(旋轉槽開口部)214，且經由未圖示之軟管而連接於自來水旋塞(水龍頭)。另一方面，供水管213之另一端部分成2股。該2股之一者係經由第1供水閥215及第1供水軟管217而連接於供水噴嘴206。又，上述2股之另一者係經由第2供水閥216及第2供水軟管218而連接於未圖示之洗滌劑盒。流入至該洗滌劑盒之自來水係於含有洗滌劑盒內之洗滌劑或柔軟劑後，經由未圖示之軟管被供給至水槽203與滾筒204之間。再者，作為第1供水軟管217及第2供水軟管218，例如，使用包含相對較為柔軟之橡膠或氯乙烯之軟管。再者，圖16省略供水口214之圖示。 上述門202具有玻璃視窗221、及安裝於該玻璃視窗221之周緣部之樹脂製之框體222。於該框體222，設置有供使用者抓握之把手。 上述水槽203係以後部較前部靠下之方式傾斜。又，水槽203具有與外箱開口部211對向之水槽開口部231。於該水槽開口部231，安裝有供水噴嘴206與環狀之橡膠製之襯墊232(於圖18中示出)。於門202鎖閉外箱開口部211時，門202之玻璃視窗221之前部密接於襯墊232之內周緣部。藉此防止水槽203內之洗滌水漏出至水槽203外。又，若門202鎖閉外箱開口部211，則門202之玻璃視窗221之後部進入至滾筒204內而與供水噴嘴206之自來水之噴射區域重疊。再者，上述洗滌水係指含有洗滌劑或柔軟劑等之水，或不含有洗滌劑或柔軟劑等之水。 上述滾筒204係與水槽203同樣地，以後部較前部靠下之方式傾斜。又，於滾筒204之前面部，設置與水槽開口部231對向之滾筒開口部241。又，於滾筒204之周壁，遍及整體而設置有複數個貫通孔242(圖2中僅圖示3個)。又，滾筒204收容洗滌物243。再者，滾筒開口部241係旋轉槽開口部之一例。 上述貫通孔242使洗滌水或空氣於水槽203與滾筒204之間之空間和滾筒204內之空間之間流通。例如，若為將滾筒204內之洗滌物243脫水而使滾筒204旋轉，則滾筒204內之洗滌水通過貫通孔242而流出至滾筒外。 上述馬達205例如包含變頻馬達，具有旋轉軸251。該旋轉軸251相對於水平面傾斜，前端部固定於水槽203之後面部之中央。 圖18係水槽203及其周邊部之立體圖。又，圖19係水槽203及其周邊部之概略剖視圖。 上述水槽203係如圖18、圖19所示，由設置有水槽開口部231之筒形狀之水槽前部203a、及有底筒形狀之水槽後部203b構成。該水槽後部203b之前端部固定於水槽前部203a之後端部。又，水槽後部203b係由懸架207A、懸架7B彈性支持。 圖20係表示供水噴嘴206之外觀之立體圖。又，圖21係表示將供水噴嘴206拆解後之狀態之立體圖。 上述供水噴嘴206係如圖20及圖21所示，具備噴嘴本體261、安裝於該噴嘴本體261之下游側之端部之蓋262、及使產生旋回流之回旋件263。 上述噴嘴本體261具有第1噴嘴管271、及組裝於該第1噴嘴管271之第2噴嘴管281。 於上述第1噴嘴管271，設置以螺絲被安裝於水槽開口部231之板狀之第1安裝部272、第2安裝部273。該第1安裝部272、第2安裝部273具有供插通螺絲之貫通孔274。又，於第1安裝部272之圖中上側之表面，豎立設置板狀之帶階梯之肋276。 於上述第2噴嘴管281，設置有安裝於水槽開口部231之板狀之安裝部282。該安裝部282具有供插通螺絲之貫通孔283。於將第2噴嘴管281組裝於第1噴嘴管271時，安裝部282之貫通孔283與第1安裝部272之貫通孔274重疊。藉此，若將螺絲插通至第1安裝部272之貫通孔274，則該螺絲亦插通至安裝部282之貫通孔283。 又，於上述安裝部282之圖中上側之表面，豎立設置鉤掛部284。於將第2噴嘴管281組裝於第1噴嘴管271時，鉤掛部284能夠解除地卡止於帶階梯之肋276之相對較低之部分。 又，於上述第2噴嘴管281之外周面之上游側之端部，豎立設置朝徑向外側突出之三角柱形狀之突起部285。於將第2噴嘴管281組裝於第1噴嘴管271時，突起部285抵接於第1噴嘴管271之下游側之端面。 又，於上述第2噴嘴管281之外周面之下游側之端部，設置有環狀之第1肋286、及較該第1肋286位於下游側之環狀之第2肋287。該第1肋286抵接於蓋262之上游側之端面而進行蓋262之定位。另一方面，第2肋287嵌入至蓋262之內周面而使蓋262不易自第2噴嘴管281脫落。 上述蓋262係由彈性材料(例如橡膠)構成。又，於蓋262之前端面設置噴出口291，來自噴嘴本體261側之自來水通過噴出口291。 上述回旋件263能夠旋轉地收容於第2噴嘴管281之下游側之端部內。又，回旋件263具有變更自來水之水流之大致半圓板形狀之2個部分301、302，剖面形狀呈大致X字形狀。 圖22係表示自與圖20相反之側觀察時之供水噴嘴206之外觀之立體圖。 圖23係用於說明供水噴嘴206之安裝之立體圖。 於上述水槽開口部231，以位於襯墊232之後方之方式，安裝有環狀之樹脂製之襯墊蓋233。以供水噴嘴206之一部分與該襯墊蓋233重疊之方式，將供水噴嘴206安裝於水槽開口部231。 又，於上述水槽開口部231，設置有筒形狀之連接部313。於對水槽開口部231安裝供水噴嘴206時，使供水噴嘴206之內筒部311插入至連接部313內，並將供水噴嘴206之外筒部312外嵌至連接部313。此時，內筒部311因其較外筒部312，軸向之長度較長，故內筒部311作為將供水噴嘴206之外筒部312引導至連接部313之導件發揮功能。 (供水噴嘴之噴出口之形狀) 本實施形態之供水噴嘴206之噴出口291成為如圖20所示，與在上述實施形態1或2中所說明之噴出口11、噴出口51之開口形狀同樣地，具有較寬之部分、較窄之部分、及擔負連結較寬之部分與較窄之部分之作用之連結部分之構成。因此，供水噴嘴206之效果亦與上述實施形態1、2相同。 (效果) 根據上述構成之洗衣機，因自供水噴嘴206噴出之洗淨水(自來水)成為脈動流，故對於洗淨對象物即洗滌物243，能夠兼顧洗淨水壓與洗淨面積(量感)。又，因能夠藉由製出較大之水團而亦獲得洗淨面積(量感)，故能夠藉由脈動流與水團之大小提高洗淨水壓與洗淨面積之兩者。且，於脈動流之情形時，對於水滴之體積、重量而言水滴之表面積變小，因此，能夠使空氣阻力之影響相對小於重力之影響，故能夠維持直至撞擊對象物即洗滌物243為止之水勢，能夠抑制水壓之降低。因此，能夠取得於較短之時間內獲得較高之洗淨力之效果。 進而，於脈動流之情形時，相較於連續流之情形，因使用之水較少便能夠完成洗滌，故能夠提高節水性能。 又，於脈動流之情形時，對於洗滌物234，因能夠使大小不一之水與之產生撞擊，故亦可獲得相同大小之水滴連續撞擊之情形時無法獲得之「鬆解」效果。 因此，上述構成之洗衣機係不會因追加複雜之構成而引起成本上升之極簡單之構成，且取得如下效果，即，能夠維持直至撞擊洗滌物243為止之水勢，藉由抑制水壓之降低，獲得較高之洗淨力，此外，能夠謀求洗淨時間之縮短及節水性能之提高。 [總述] 本發明之態樣1之噴嘴係具備噴出流體之噴出口(11、51)之噴嘴(1)，其特徵在於上述噴出口(11、51)之開口區域之至少一部分收縮。 根據上述構成，藉由噴出口之開口區域之至少一部分收縮，於開口區域內產生區域面積較寬之部分與較窄之部分。根據該構成，於自噴出口噴出時，根據水之黏性與表面張力之關係(平衡)，較窄之部分係相對於面積之潤濕緣之長度較長，吹出口壁面之黏性阻力較大，故水難以通過，且因與表面張力之平衡而容易殘留水。另一方面，較寬之部分係相對於面積潤濕緣之長度較短，吹出口壁面之黏性阻力較小，故水容易通過，且因與表面張力之平衡而不易殘留水。因此，較寬之部分先於較窄之部分而出水，較窄之部分則略遲於較寬之部分而出水。即，自較寬之部分勢頭強勁地噴出水，自較窄之部分略遲噴出水。 因此，於所噴出之水面在同一面內出現壓力之不均勻時，吸入口之較窄之部分之壓力低於較寬之部分之壓力而自較窄之部分吸引空氣，空氣以填隙之形式進入至水流內。藉此，於剛噴出具有收縮形狀之1個較大之團後，水團便立即由所吸引之空氣從中截斷。被從中截斷之水團係因表面張力而自連結部分脫出之部分逐漸收縮，並最終形成空氣之空間而分離成球狀。就噴出口之形狀而言，自較寬之部分噴出之水先行行進而成為較大之水滴，自較窄之部分噴出之水略遲行進而分離成較小之水滴。此時，於噴出後分離之較大之水滴與較小之水滴依序噴灑至洗淨之對象部，因各者之噴灑時序不同，故就要洗淨之局部而言，相較於面積較窄之連續之水流持續噴灑之情形，藉由分離之水滴之噴灑能夠產生較高之碰撞能而將其洗淨，故洗淨性能提高。又，藉由包含自較寬之部分噴出之較大之水滴，洗淨面積較寬而亦獲得量感，並且因較大之水團與連續流相比於短時間內消散，故碰撞能進一步提高。再者，能夠藉由對形狀進行各種設計而調整量感。 此外，根據該構成，相較於在大範圍配置若干自較小之孔噴出之連續流之情形，能夠使水滴增大，故相對於水滴之體積、重量之水滴之表面積較小，因此，能夠使空氣阻力之影響相對小於重力影響，藉此，能夠大幅減少水之飛濺。 且，無需使用特殊之壓力產生機構等複雜之機構，僅藉由噴嘴之噴射口形狀之設計便能夠實現對洗淨性能而言極有利之不連續之所謂脈動流之產生。 因此，其係不會因追加複雜之構成而引起成本上升之極簡單之構成，且取得如下效果，即，亦不存在水之無益之飛濺，兼顧量感上升與水壓上升而能夠獲得較高之洗淨力。 本發明之態樣2之噴嘴係如上述態樣1，其中上述噴出口(11)之開口區域包含至少2個開口部(第1開口區域11a、第2開口區域11b、第3開口區域11c、第4開口區域11d)、及連接該等開口部(第1開口區域11a、第2開口區域11b、第3開口區域11c、第4開口區域11d)而形成連續之一個開口區域的連接部(第1連接區域11e、第2連接區域11f、第3連接區域11g)，且上述開口部(第1開口區域11a、第2開口區域11b、第3開口區域11c、第4開口區域11d)係相當於上述連接部(第1連接區域11e、第2連接區域11f、第3連接區域11g)之部分可收縮。 根據上述構成，因呈現上述態樣1之噴出口之開口形狀之一例，故取得與上述態樣1相同之效果。 本發明之態樣3之噴嘴係如上述態樣2，亦可為，以形成上述開口區域之開口部(第1開口區域11a、第2開口區域11b、第3開口區域11c、第4開口區域11d)中之開口面積最大之開口部(第1開口區域11a)為中心而於其周圍配置剩餘之開口部(第2開口區域11b、第3開口區域11c、第4開口區域11d)。 根據上述構成，藉由以開口面積最大之開口部為中心而於其周圍配置剩餘之開口部，能夠任意地設定不連續之水滴之數量。 本發明之態樣4之噴嘴係如上述態樣2或3，亦可為，上述開口區域之周緣係僅由平滑之曲線形成。 根據上述構成，因僅由平滑之曲線形成開口區域之周緣，故不存在成為自噴出口噴出水時之阻力而阻礙流動之情形便能夠獲得上述效果。藉此，相較於非平滑地形成之情形，無需提高泵等之性能便能夠抑制流速之降低，能夠使洗淨性能更有效率地地上升。 本發明之態樣5之噴嘴係如上述態樣1至4中之任一態樣，亦可為，上述噴出口(23)之流體噴出之流路(23a)之一部分傾斜。 根據上述構成，因噴出口之流體噴出之流路之一部分傾斜，故其成為流體之噴出方向(角度)之導向部，能夠向穩定之方向吹出。藉此，在浴廁等中，能夠向使用者之成為洗淨對象之局部之方向(斜方向)適當地吹出流體，故能夠進一步提高洗淨性能。 本發明之態樣6之噴嘴係如上述態樣1，亦可為，於上述噴出口(51)，形成遮蔽開口區域(51a)之至少一部分之遮蔽部(52、53、54)。 根據上述構成，因呈現上述態樣1之噴出口之開口形狀之一例，故取得與上述態樣1相同之效果。 本發明之態樣7之噴嘴係如上述態樣6，亦可為，上述遮蔽部(52、53、54)係以將上述噴出口(51)之流體噴出之流路中之阻礙流體之流動之一部分之部位縮窄之方式傾斜地形成。 根據上述構成，於自噴出口噴出時，根據水之黏性與表面張力之關係(平衡)，關於因凸形狀被遮覆而被阻流之部分，因相對於面積之潤濕緣之長度較長，吹出口壁面之黏性阻力較大，故水難以通過。因此，較寬之部分先於較窄之部分而出水。較窄之部分略遲於較寬之部分而出水。即，自較寬之部分勢頭強勁地噴出水，自較窄之部分略遲而噴出水。 因此，取得與上述態樣1相同之效果。 本發明之態樣8之流體噴出裝置之特徵在於：其係具備噴出流體之噴嘴(1)之流體噴出裝置(本體3)，且上述噴嘴(1)為上述態樣1至7中任一態樣之噴嘴。 根據上述構成，其係不會因追加複雜之構成而引起成本上升之極簡單之構成，且亦不存在流體之無益之飛濺，能夠兼顧量感提昇與水壓提昇。 本發明之態樣9之洗淨機器之特徵在於：其係具備對洗淨對象噴出洗淨水之噴嘴之洗淨機器(攜帶式臀部洗淨器100)，且上述噴嘴係上述態樣1至7中任一態樣之噴嘴。 根據上述構成，其係不會因追加複雜之構成而引起成本上升之極簡單之構成，且取得如下效果，即，亦不存在洗淨水之無益之飛濺，能夠兼顧量感提昇與水壓提昇而獲得較高之洗淨力，此外，能夠謀求洗淨時間之縮短及節水性能之提高。 本發明之態樣10之洗衣機具備：外箱201，其具有外箱開口部211；水槽203，其配置於上述外箱201內，具有與上述外箱開口部211對向之水槽開口部231；旋轉槽(滾筒204)，其能夠旋轉地配置於上述水槽203內，具有與上述水槽開口部231對向之旋轉槽開口部(滾筒開口部241)；及供水噴嘴206，其自噴出口291噴出水而將其供給至上述旋轉槽(滾筒204)內；且上述供水噴嘴206係技術方案1至7中任一項之噴嘴。 根據上述構成，其係不會因追加複雜之構成而引起成本上升之極簡單之構成，且取得如下效果，即，能夠維持直至撞擊洗滌物為止之水勢，藉由抑制水壓之降低而獲得較高之洗淨力，此外，能夠謀求洗滌時間之縮短及節水性能之提高。 本發明並非限定於上述各實施形態而能夠於申請專利範圍中所涉獵之範圍內進行各種變更，適當組合不同實施形態分別所揭示之技術手段而獲得之實施形態亦包含於本發明之技術範圍內。進而，能夠藉由組合各實施形態分別所揭示之技術手段而形成新穎之技術特徵。[Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail. In the present embodiment, water is used as an example of the fluid, but the water is not limited thereto. (Summary of Nozzle) FIG. 2 is a schematic view for explaining the entire nozzle 1 , and FIG. 3 is a view showing a cross-sectional view taken along line AA of FIG. 2 . As shown in FIG. 2 and FIG. 3, the nozzle 1 includes a cylindrical casing 1a whose one end is closed and whose other end is open, and at the end of the closed side of the casing 1a, a discharge port 11 for discharging a fluid is formed, and The end portion on the open side forms an opening portion 12 for introducing water (fluid) into the nozzle 1. The opening 12 is connected to, for example, the body of the portable cleaning device. In the present embodiment, the details of the portable cleaning device are omitted. However, in the third embodiment described below, the portable cleaning device will be described. (Shape of nozzle discharge port) As shown in Fig. 1, the discharge port 11 of the nozzle 1 includes a first opening region 11a, a second opening region 11b, a third opening region 11c, a fourth opening region 11d, and a first connecting region 11e. The second connection region 11f and the third connection region 11g are connected to each other by the first connection region 11e and the second opening region 11b, and the second connection region 11f is connected to the first opening region 11a and the third opening region 11c. The third connection region 11g connects the first opening region 11a and the fourth opening region 11d to form one opening region. Here, in the present embodiment, the first opening region 11a of the discharge port 11 has a substantially circular shape with a diameter of about 0.74 mm, and the second opening region 11b and the third opening region 11c have a substantially circular shape with a diameter of about 0.5 mm. The opening region 11d has a substantially circular shape with a diameter of about 0.3 mm. Furthermore, the size of each of the above-described opening regions is merely an example and is not limited to the numerical values. When the discharge port 11 is viewed in plan, among the above-described regions constituting the discharge port 11, the opening area of the first opening region 11a is the widest (maximum), and the second opening region 11b and the third portion are disposed around the discharge port 11. The opening area 11c and the fourth opening area 11d have smaller opening areas than the first opening area 11a. Therefore, the opening area of the discharge port 11 has a shape that contracts at three places. The symbol K in Fig. 1 indicates the contraction of three portions of the opening region of the discharge port 11. (Behavior of the fluid ejected from the nozzle 1) Next, the behavior of the water ejected from the nozzle 1 of the opening shape shown in Fig. 1 will be described below with reference to Figs. 4 to 7 . The water discharged from the discharge port 11 of the nozzle 1 is integrated as shown in Fig. 4, but is separated into a large group (corresponding to the first opening region 11a) and smaller as time elapses. The group (corresponding to the second opening region 11b, the third opening region 11c, and the fourth opening region 11d), and the larger group is first sprayed onto the object. In other words, as shown in FIG. 5, when the water is ejected from the discharge port 11, the narrower portion (the second opening region 11b, the third opening region 11c, and the fourth opening) is formed according to the relationship (balance) between the viscosity of the water and the surface tension. In the region 11d), the length of the area of the wetting edge with respect to the opening region is long, and the viscosity of the wall surface of the discharge port 11 is large, so that it is difficult for water to pass therethrough, and water is likely to remain due to the balance with the surface tension. On the other hand, the wider portion (the first opening region 11a) has a shorter length of the wetting edge with respect to the area of the opening region, and the viscous resistance of the wall surface of the discharge port 11 is small, so that water easily passes, and Balance with surface tension without easily leaving water. Therefore, in the discharge port 11, the wider portion discharges water before the narrower portion, and the narrower portion discharges water slightly later than the wider portion. That is, water is sprayed from a wider portion with a strong water potential, and water is sprayed slightly later from a narrower portion. Therefore, when the pressure is uneven in the same surface on the water surface to be ejected, the pressure of the narrower portion of the suction port (the contraction portion of the symbol K) is lower than the pressure of the wider portion, so the narrower portion Attracting air, the air enters the water stream in the form of a gap. Therefore, after ejecting a large group having a contracted shape, the water mass is immediately temporarily cut off by the sucked air. The water mass cut off from this is gradually contracted by the surface tension due to the surface tension, and finally forms a space of air and is separated into a spherical shape (refer to Y and FIG. 6 in FIG. 4). As shown in Fig. 6, in terms of the shape of the discharge port 11, the water ejected from the wider portion becomes the larger water droplet L1 that travels in advance, and the water ejected from the narrower portion is separated to travel slightly later than it. Smaller water droplets (L2, L3, L4). Here, the water droplet L1 corresponds to the water ejected from the first opening region 11a, the water droplet L2 corresponds to the water ejected from the second opening region 11b, the water droplet L3 corresponds to the water ejected from the third opening region 11c, and the water droplet L4 corresponds to the fourth opening region. 11d spouted water. Further, the water droplets L1 to L4 are moved to the object in the order of the group as shown in FIG. As shown in Fig. 7, the first drop to the object is the water droplet L1 of the largest group. Then, the water droplets L2, L3, and L4 sequentially arrive at the object. In this way, the water ejected from the ejection port 11 becomes a separated large water droplet and a small water droplet after being ejected, and the water droplets are sequentially sprayed onto the object to be washed, and the spraying timing of each water droplet is shifted. Thus, when the water droplet L1 is sprayed onto the object, the kinetic energy of the water droplet L1 is converted into collision energy. (Washing Mechanism) An apparatus for washing water to be washed with an object will be described in detail. Kinetic energy of water (E=1/2 mv 2 ) is converted into an impulse (E = FΔt) at the time of impacting the object. The change in momentum of an object is equal to the impulse experienced here. Here, m represents the amount of water, v represents the speed of water, Δt represents the time taken for water to collide with the object, and F represents the force (detergency) of the water colliding with the object. Here, if two volumes of water are to be ejected from the same area, the speed v is doubled and the energy E is four times. That is, if the amount of water (m) is the same, the faster the speed v, the higher the kinetic energy E. Further, if the kinetic energy E of the water is the same, the shorter the Δt, the stronger the collision force F (cleaning power). Δt becomes longer in the continuous flow due to the time taken for the water to collide with the object, and becomes shorter in the discontinuous water flow (pulsating flow). That is, if the kinetic energy E of the water is the same, the washing power F of the pulsating flow is stronger than the washing power F of the continuous flow. Therefore, the water droplets having a high kinetic energy E and having a strong detergency F at the time of hitting the object are strongly spread by the collision of the object, so that the washing area is enlarged. (Comparison of cleaning performance) Here, the cleaning performance is compared between the case where the water flow from the nozzle is a continuous flow and the case where the flow is a discontinuous flow (pulsating flow). Fig. 8(a) shows the behavior of water ejected from the ejection port a containing a plurality of smaller holes, and Fig. 8(b) shows the behavior of water ejected from the ejection port b including a circular hole. (c) of 8 indicates the behavior of water ejected from the discharge port c (corresponding to the discharge port 11 of the nozzle 1 of the present embodiment) which is one of the three holes which are contracted in the opening region. Further, since the discharge ports a to c have the same opening shape but the same opening area, the amount of water (water amount (m)) discharged from the discharge ports a to c is also the same. Since the discharge port a is composed of a plurality of smaller holes, a plurality of fine and continuous waters (continuous flow) are ejected. In this case, since the water flow is fine, the influence of air resistance and gravity becomes large, and the splash of water becomes intense. As a result, there is a problem that water is less likely to be sprayed onto the object due to the splash of water. Further, even when water is sprayed onto the object, the continuous flow has a problem that the cleaning force F is weak because the Δt is long. Since the discharge port b is composed of a circular hole, a wide and continuous water (continuous flow) is ejected. In this case, since the water flow is thicker than the discharge port a, the water is sprayed on the object in a wide range, so that the sense of volume is high (the area is wide), but the continuous flow is longer because the Δt is longer than the discharge port a. Produces a problem that the detergency F is weak. The discharge port c is composed of one hole which is contracted by three portions of the opening region, so that the narrow portion is long because the wet edge is long with respect to the area, so the viscous resistance of the discharge port wall surface is large, and the wide portion Since the length of the wetting edge is short, the viscous resistance of the wall surface of the discharge port is small, so that the narrow portion of the wide portion is first discharged. Thereby, the water droplets of different sizes are continuously ejected in plurality, and become a pulsating flow. Therefore, the discharge port c can increase the water droplets compared with the discharge port a in which a plurality of continuous flows ejected from the smaller holes are arranged in a wide range, so that the surface area of the water droplets is larger than the volume and weight of the water droplets. Small, therefore, the effect of air resistance can be relatively less than the influence of gravity, so the splash of water can be greatly reduced. Further, the water potential up to the object to be hit can be maintained, and the decrease in the water pressure can be suppressed. In addition, since the amount of water e ejected from the discharge ports a to c is the same, the discharge port c is ejected while sucking air immediately after being ejected, so that the surrounding air is sucked while being ejected. Correspondingly, the speed of each water droplet rises, and since Δt is extremely short, the kinetic energy E of the water droplet becomes high, and the detergency F also increases. Further, since the kinetic energy E of the water droplets ejected from the wide portion is increased, the water droplets are spread with a strong force on the object, and the water is sprayed to a wide range, so that the feeling is also obtained in the same manner as the discharge port b. Further, it is possible to adjust the sense of mass by variously designing the shape of the opening region of the discharge port 11. As described above, the discharge port c is formed by merely designing the opening shape of the discharge port c, and it is possible to form a discontinuous water flow which is excellent in cleaning performance, that is, so-called pulsation, without using a complicated mechanism such as a special pressure generating mechanism. flow. Therefore, according to the nozzle 1 of the present embodiment, the structure is not extremely complicated due to the addition of a complicated configuration, and there is no unhelpful splash of water, and both the sense of volume improvement and the water pressure increase can be obtained. High cleansing power. In this way, when the nozzle 1 which can achieve a high cleaning power while achieving both the sense of volume improvement and the water pressure increase is used, it is possible to shorten the cleaning time of the object and improve the water-saving performance. (Other nozzles) The nozzle 101 shown in Fig. 9 has a discharge port 21 different from the shape of the discharge port 11 of the nozzle 1 shown in Fig. 1 . The area of the opening 21a of the discharge port 21 on the discharge side of the water is smaller than the area of the opening 21b on the introduction side of the water from the opening 22. That is, the discharge port 21 has a shape in which the opening is narrowed toward the discharge direction of the water. Thereby, the pressure of the water discharged from the discharge port 21 can be increased, and the speed v of the water discharge can be increased. Therefore, the kinetic energy E of the water can be increased to improve the washing power. Similarly to the nozzle 101 shown in Fig. 9, the nozzle 102 shown in Fig. 10 has a discharge port 23 different from the shape of the discharge port 11 of the nozzle 1 shown in Fig. 1. As shown in Fig. 10, the discharge port 23 has an inner wall surface 23a which is inclined obliquely. According to this configuration, the guide surface of the water discharge direction (angle) can be ejected in a stable direction. Moreover, the washing performance can be further improved by obliquely ejecting toward the direction of the partial portion of the object to be cleaned. For example, when the nozzle 102 shown in FIG. 10 is used in a portable buttocks washer, the user approaches the part of the object to be cleaned from the front side (ventral side) or approaches the part from the back side (back side). In order to properly spray the water to the part, it is only necessary to change the hand-held angle, but it is necessary to apply a burden to the wrist or maintain the posture while twisting the wrist. When the nozzle 102 shown in FIG. 10 uses the nozzle 102 having the inner wall surface 23a inclined obliquely, the nozzle 102 can change the direction in which the water flow is ejected by changing the angle of the tip end of the nozzle 102. In other words, the inner wall surface 23a of the discharge port 23 may be formed so as to be inclined toward the front side when approaching from the front side and inclined to be opposite to the case of approaching from the buttock side. In this case, the nozzles of the inner wall surface 23a having the opposite inclination directions may be prepared in advance, and the nozzles may be replaced depending on the purpose of use. Further, since the water ejected from the nozzles 101 and 102 is a spherical discontinuous flow (pulsating flow), if the size of the water droplets is varied, the distances of the water droplets ejected from the obliquely inclined nozzles are different, and the water is drawn. Their respective parabola. In other words, it is also possible to sprinkle a large amount of water droplets having different arrival distances by adjusting the size of the water droplets. Therefore, it is possible to wash the object to be washed across a wide range and with less spatter. In the present embodiment, three narrow portions (second opening region 11b, third opening region 11c, and the like) are provided so as to surround the wide opening portion (first opening region 11a) of the discharge port 11 of the nozzle 1. The example of the 4 opening region 11d) will be described. Here, it is possible to adjust the number of water droplets which are successively dropped to the large group of water droplets by adjusting the number of narrow portions provided in such a manner as to surround the wider portion. Hereinafter, an example of an opening area of the discharge port of another nozzle which has the same effect as that of the nozzle 1 will be described. (Example of the shape of the discharge port) In the present embodiment, the shape of the discharge port may be not only the discharge port 11 shown in Fig. 1, but also other shapes. In other words, the constricted portion may be formed at at least one portion of the opening region of the discharge port. Further, it is preferable that at least two openings constitute an opening region of the discharge port, and an opening area of one opening portion is different from an opening area of the other opening portion. That is, it is preferable that the opening area of the discharge port includes at least one wide portion and at least one narrow portion. For example, in FIG. 11, various types of discharge ports are shown which are combined with a wider portion and a narrower portion, but the open areas of the uniform discharge ports include at least one wider portion and at least one narrower portion. In part, the same effects as those of the nozzle 1 of Fig. 1 were obtained. Further, the peripheral edge of the opening region in the discharge port of the shape shown in (a) to (f) of Fig. 11 is obtained only by the discharge port of the shape shown in Figs. 11(c) to (f) which are formed by smooth curves. The following effects. Since the peripheral edge of the opening region is formed only by the smooth curve, there is no possibility that the flow is prevented from flowing when the water is ejected from the discharge port, and the above-described effects can be obtained. Therefore, compared with the case where it is not smoothly formed ((a) and (b) of FIG. 11 ), it is possible to suppress the decrease in the flow rate without increasing the performance of the pump or the like, and to obtain the effect of improving the cleaning performance more efficiently. . (Application example of the nozzle) As in the case of the nozzle 1, a plurality of narrow portions (the second opening region 11b and the third opening region) are provided so as to surround the wide portion (the first opening region 11a) at the discharge port 11. 11c and the fourth opening region 11d) are capable of generating discontinuous water droplets. Thereby, the water ejected from the ejection outlet 11 becomes a regular water flow having a large, small, small, small, large, small, small, small, and the like. If water having such a law is sprayed onto the subject, the effect of massaging the subject can be obtained. Thus, the law of the water to be ejected is adjusted according to the number of narrower portions formed around the wider portion. For example, in a toilet, the amount of the narrower portion is set in such a manner as to be a better amount of water and frequency for washing the buttocks, or the setting is narrower in such a manner as to be a better amount of water and frequency for the shower nozzle. The number of parts, or the number of narrower parts according to the characteristics of various washing forms. For example, by causing an impact in a washing machine of different sizes, it is also possible to obtain a "release" effect that cannot be obtained when the water droplets of the same size are continuously struck. In this case as well, in the same manner as in the case of washing the buttocks, the number of the narrower portions is set so as to be the preferred amount of water for washing and the size of the water droplets, or is preferably set in a manner suitable for the washing mode. The number of narrower parts, or the number of narrower parts depending on the characteristics of the various washing modes. Therefore, the nozzles are made variable (the number of narrower portions is variable) according to each setting, or the nozzles (replacement of the nozzles provided for each of the narrower portions). In the present embodiment, the nozzle 1 is designed such that the shape of the discharge port 11 itself (inner wall portion or the like) is used to cause the flow of the discharged water to be a pulsating flow. However, the present invention is not limited to these and may not be changed. The inner wall portion of the discharge port forms a shielding portion that shields at least a portion of the opening region, in such a manner that the water flow becomes a pulsating flow. This example will be described in the second embodiment below. [Embodiment 2] Another embodiment of the present invention will be described below. It is to be noted that the same reference numerals are given to members having the same functions as those of the members described in the above embodiments, and the description thereof will be omitted. (The shape of the discharge port of the nozzle) As shown in Fig. 12, the discharge port 51 of the nozzle of the present embodiment is formed such that the three shielding portions 52 to 54 project from the side edge of the circular opening 51a having a circular diameter R toward the center. . Thereby, the nozzle discharge port 51 has a configuration in which a portion of the opening hole 51a is convexly covered to form an opening 51b having a smaller opening area than the opening hole 51a, and a part of the water flow of the water ejected from the opening hole 51a is blocked. . The opening 51b has an opening shape in which three constricted portions are formed in the same manner as the opening shape of the discharge port 11 of the first embodiment. Here, in the present embodiment, the water flow of the water is blocked by the three convex shielding portions 52 to 54 from the opening holes 51a having a diameter of R = 1.85 mm. The shielding portions 52, 54 are in a protruding direction (maximum length) of 0.4 mm × a length direction (maximum length) of 1.4 mm, and a tube sectional area of 0.37 mm. 2 The wetting edge length is about 3.54 mm. The shielding portion 53 has a protruding direction (maximum length) of 0.66 mm × a length direction (maximum length) of 1.0 mm, and a tube cross-sectional area of 0.45 m. 2 The wetting edge length is about 3.47 mm. Therefore, the equivalent hydraulic diameters representing the representative lengths of the present embodiment are respectively (equivalent hydraulic diameter d=4A/L←A: tube cross-sectional area, L: wetting edge length) d1=(4×0.37/3.54) ) = 0.41 d2 = (4 × 0.45 / 3.47) = 0.51 The aspect ratio W/D of the width W and the depth D of the concave portion (cavity) of the cross section is as follows. W1/D1 (region on the upper side of the opening 51b in Fig. 12) = 0.5 / 0.65 = 0.77 W2 / D2 (the area around the opening 51b in Fig. 12) = 0.53 / 0.66 = 0.8 Here, preferably, the profile The aspect ratio W/D of the width W and the depth D of the concave portion is 1 or more, and as described above, the effect can be exhibited at 0.5 or more. That is, the effect is larger when the depression is deeper, and the effect is weaker if the depression is shallower. Further, it is possible to reduce the surface tension of the liquid or to deteriorate the wettability of the wall surface of the discharge port, that is, to become hydrophobic or water-repellent, and to further reduce the aspect ratio W/D of the shape of the outlet, and to shorten the run. The wet edge length can increase the equivalent hydraulic diameter. Here, it can be expressed as an equivalent hydraulic diameter d=4 A/L (A: tube cross-sectional area, L: wetting edge length (representing the representative length of the flow path)). Therefore, the larger the equivalent hydraulic diameter, the smaller the pressure loss at the discharge port, so that the loss can be reduced and the energy of the blown water can be reduced. That is, even if the depression is shallow, if it is a liquid having a high surface tension or a wall surface having poor wettability, the effect is also high. When the water is ejected from the discharge port 51, the opening 51b that blocks the formation of the water flow by the shielding of the convex portions 52 to 54 is formed in accordance with the relationship between the viscosity of the water and the surface tension (balance). The area of the center (the wider part) is shorter due to the shorter length of the wetting edge relative to the area, and the viscous resistance of the wall of the outlet is smaller, so the water easily passes through, and the three surrounding areas (the narrower part) are infiltrated. The length of the wet edge relative to the area is long, and the viscous resistance of the wall surface of the discharge port is large, so that water is difficult to pass. Therefore, the wider portion is discharged before the narrower portion. The narrower portion is slightly later than the wider portion. That is, water is strongly ejected from a relatively wide part of the momentum, and water is ejected slightly later from the narrower portion. Further, the aspect ratio W/D of the width W and the depth D of the concave portion of the above-mentioned cross section indicates the value when the fluid is water, and in the case of a fluid other than water, the numerical value changes depending on the characteristics of the fluid. Further, the nozzle-shielding portion of the present embodiment is formed to be inclined so as to obliquely narrow a portion of the water flow that blocks the water. According to this configuration, it is possible to eject in the target direction by being inclined obliquely while being narrowed. (Example of the shape of the discharge port) In the present embodiment, the shape of the discharge port is not limited to the discharge port 51 shown in Fig. 12, and may be other shapes. In other words, the shielding hole may be formed in at least one portion of the opening hole of the discharge port. For example, as shown in FIG. 13(a), one shielding portion may be formed in the circular opening hole, and as shown in FIG. 2(b), two shielding portions may be formed in the circular opening hole. Further, as shown in FIG. 13(c), one shielding portion may be formed in the opening hole of the square shape, and as shown in FIG. 3(d), two shielding portions may be formed in the elliptical opening. The shape of any of the openings can be made into a pulsating flow in the same manner as in the first embodiment described above. As described above, in the above-described first and second embodiments, in order to make the water discharged from the discharge port into a pulsating flow, a region having a different pressure must be present in the opening region of the discharge port. That is, by increasing the pressure in the central portion of the opening region and lowering the pressure around the center portion, the pressure difference causes the water to separate into a larger group and a smaller group to become a pulsating flow. To create the pressure differential required to form the pulsating flow, the shape of the open area of the nozzle outlet is designed. Therefore, the shape of the opening region of the discharge port of the nozzle can be set to any shape as long as the pressure difference required to form the pulsating flow can be generated. Further, if it is considered that the pulsating flow is generated by the suction of the air from the negative pressure portion, it is preferable to cut the water flow in the narrow portion. That is, it is more preferable to provide a shape of a narrower portion between the wider portion and the other wider portion. Further, the nozzles disclosed in the first and second embodiments can be applied to a beauty machine, a washing machine, an ejection device, a washing machine, or the like. Further, the fluid transport means for ejecting from the nozzle can be used in various forms such as a piston type, a spiral type, a pump, or a motor. In the following embodiments, an example in which the nozzle of the present invention is applied to a portable type cleaner (portable type hip cleaner) will be described. [Embodiment 3] Another embodiment of the present invention will be described below. In the following description, members having the same functions as those described in the above embodiments are denoted by the same reference numerals, and their description will be omitted. In the present embodiment, a portable cleaner according to the present invention is applied to an example of a portable hip cleaner for washing a person's buttocks. (a) and (b) of FIG. 14 are perspective views showing a schematic configuration of the portable buttocks washer 100 of the present embodiment. (Brief Description of the Carrying Butt Washer 100) The portable buttocks washer 100 is a washing device that washes the washing target by washing the washing water (the buttocks) with the washing target. As shown in FIG. 14(a), the carrying hip cleaner 100 includes a storage tank 2 for storing washing water, and a nozzle 1 for forming a discharge port 11 for normal washing for washing the washing target. The main body (fluid ejection device) 3 for supplying the washing water stored in the storage tank 2 to the nozzle 1, and the nozzles slidably provided in the nozzle 1 and constituting the washing water using the sump 2 An outer cylinder 4 (sliding member) which is one of the constituent elements of the cleaning mechanism. The storage tank 2 includes a cylindrical casing 2a whose surface is formed into a substantially octagonal shape (an example) and whose inner surface is formed into a substantially circular cross section, and has a storage space for storing the washing water inside the casing 2a. The storage space of the inside 2b of the storage tank 2 is a storage space for the storage main body 3 as shown in Fig. 14(b) when the washing water is discharged. The main body 3 is housed in the interior 2b of the storage tank 2, and covers the diaphragm pump 32 or the like as a built-in washing water supply unit by a cylindrical casing 3a whose surface is substantially round in shape (Fig. 3). On the surface of the casing 3a, an operation button group 31 for operating the portable buttocks cleaner 100 is provided. Though not shown, the operation button group 31 is provided with a button for performing execution and stop of the normal cleaning (normal cleaning mode) for cleaning the cleaning target (hip), and is used for performing cleaning. Various operation buttons such as the button for executing and stopping the nozzle cleaning (nozzle cleaning mode) of the nozzle 1 and the button for setting the amount of water during washing. However, for the above-mentioned normal washing and nozzle washing, it is also possible to perform the button operation without using a certain signal as a trigger. The depth of the inner portion 2b of the sump 2 is set to be the same as or slightly longer than the length of the body 3 in the longitudinal direction. Further, the casing 3a of the main body 3 is formed such that the outer diameter is the same as or slightly smaller than the inner diameter of the inner surface of the casing 2a of the sump 2. Thereby, the main body 3 is completely accommodated in the inside 2b of the storage tank 2 as shown in FIG.14(b). At this time, the nozzle 1 is housed in the body 3. In this manner, the main body 3 is in a state of being housed in the interior 2b of the sump 2 when it is carried, and is at least pulled out from the inside 2b of the sump 2 until the operation button group 31 formed on the casing 3a is exposed. The position is fixed to the state of the sump 2. (Details of the Body 3) FIG. 15 is a perspective view showing a schematic configuration of the body 3. In addition, in FIG. 15, the case 3a shown in (a) of FIG. 14 is abbreviate|omitted for convenience of description. The main body 3 includes a diaphragm pump 32 as a washing water supply unit, a drain port at one end connected to the diaphragm pump 32, and the other end connected to the drain pipe 33 of the nozzle 1, one end connected to the suction port of the diaphragm pump 32, and the other end connected to the drain port 33. The suction pipe 34 of the return valve 35, the water suction port 36 for sucking the washing water from the storage tank 2 (Fig. 2 (a), etc.), the battery cover 37 as a cover of the battery storage portion (not shown), and the formation A rubber gasket 38 on the outer peripheral surface of the connecting portion of the body 3 and the sump 2. Furthermore, the battery cover 37 achieves a waterproof function by closing the battery storage portion. Further, the waterproof function of the connection portion between the body 3 and the sump 2 is achieved by the rubber gasket 38. The check valve 35 is connected at one end to the suction pipe 34 and at the other end to the suction port 36, so that the washing water from the suction port 36 flows into the suction pipe 34, and the washing water from the suction pipe 34 does not flow into the water absorption. Mouth 36. That is, the washing water from the storage tank 2 is sucked by the suction port 36, and is sent to the suction pipe 34 through the check valve 35, but the washing water that flows back from the suction pipe 34 is intercepted by the check valve 35 and cannot flow into the water absorption. Mouth 36. Therefore, when the diaphragm pump 32 is actuated, the washing water of the sump 2 is sucked from the suction port 36 through the check valve 35 through the suction pipe 34 to the inside of the diaphragm pump 32, and the drain port from the diaphragm pump 32 passes through the drain pipe 33. It is drained to the nozzle 1. In this manner, the nozzle 1 is supplied with washing water from the body 3. The nozzle 1 to which the washing water is supplied is sprayed with the washing water from the discharge port 11. The nozzle 1 can be attached and detached, and can be freely replaced according to the user's choice. (Details of the nozzle shape) The nozzle 1 of the present embodiment has a wide portion, a narrow portion, and a joint width as in the shape of the opening of the discharge port 11 and the discharge port 51 described in the first or second embodiment. The structure of the connecting portion of the portion and the narrow portion. Further, the nozzle 1 described in the present embodiment is provided with two circular discharge ports in addition to the discharge port 11 or the discharge port 51. A continuous and weak stream of water is ejected from the two circular outlets. According to this configuration, it is also possible to simultaneously generate a strong water flow and a weak water flow. As described above, the shape or the number of the discharge ports of the nozzles is preferably set in accordance with the object to be cleaned. (Effects) According to the portable buttocks washer 100 of the above configuration, since the washing water sprayed from the nozzle 1 is a pulsating flow, the washing water pressure and the washing area (a sense of quantity) can be achieved for a part of the object to be cleaned. . Further, by producing a large water mass, a washing area (a sense of quantity) can be obtained, so that both the pulsating flow and the size of the water mass can be used to increase both the washing water pressure and the washing area. Further, in the case of the pulsating flow, since the washing water does not spread until the object to be sprayed, the washing water is easily sprayed to the target range, and the unhelpful splash of the washing water is less likely to occur. Therefore, the portable buttocks washing machine having the above-described configuration does not have a structure that is extremely simple in terms of cost increase due to the addition of a complicated configuration, and has an effect that there is no unnecessary splash of the washing water, and the feeling of the volume can be balanced. The lifting and the water pressure are increased to obtain a high cleaning power, and the cleaning time can be shortened and the water saving performance can be improved. [Embodiment 4] (Washing Machine) Other embodiments of the present invention will be described below. In the following description, members having the same functions as those described in the above embodiments are denoted by the same reference numerals, and their description will be omitted. In the present embodiment, an example in which the nozzle of the present invention is applied to a water supply nozzle of a washing machine will be described. (Overview of the washing machine) Fig. 16 is a schematic perspective view showing the appearance of a drum type washing machine as an example of the washing machine of the embodiment. The drum type washing machine includes an outer box 201 having an outer box opening portion 211 at a front portion thereof. The door 202 that opens and closes the outer box opening portion 211 is attached to the front surface of the outer casing 201 so as to be rotatable in the left-right direction by a hinge. Further, an operation display portion 212 is provided on the upper portion of the front surface of the outer casing 201. The user selects the desired washing course by operating the operation display unit 212. Moreover, the operation display unit 212 displays, for example, the remaining time of the washing course and the like. Fig. 17 is a schematic cross-sectional view for explaining the configuration of the above-described drum type washing machine. The drum type washing machine includes a bottomed cylindrical water tank 203 disposed in the outer casing 201, a bottomed cylindrical drum (rotary groove) 204 rotatably disposed in the water tank 203, and a rear portion mounted on the water tank 203. Motor 205. Further, the drum 204 is an example of a rotary groove. A water supply pipe 213 is provided in the outer casing 201. One end of the water supply pipe 213 has a water supply port (rotation groove opening) 214, and is connected to a tap water faucet (faucet) via a hose (not shown). On the other hand, the other end portion of the water supply pipe 213 is formed into two strands. One of the two shares is connected to the water supply nozzle 206 via the first water supply valve 215 and the first water supply hose 217. Further, the other of the two strands is connected to a detergent cartridge (not shown) via the second water supply valve 216 and the second water supply hose 218. The tap water that has flowed into the detergent box is supplied to the detergent or softener in the detergent box, and is then supplied between the water tank 203 and the drum 204 via a hose (not shown). Further, as the first water supply hose 217 and the second water supply hose 218, for example, a hose containing relatively soft rubber or vinyl chloride is used. In addition, FIG. 16 omits illustration of the water supply port 214. The door 202 has a glass window 221 and a resin frame 222 attached to a peripheral portion of the glass window 221 . The frame 222 is provided with a handle for the user to grasp. The water tank 203 is inclined such that the rear portion is lower than the front portion. Further, the water tank 203 has a water tank opening portion 231 that faces the outer box opening portion 211. A water supply nozzle 206 and a ring-shaped rubber lining 232 (shown in FIG. 18) are attached to the water tank opening 231. When the door 202 locks the outer box opening portion 211, the front portion of the glass window 221 of the door 202 is in close contact with the inner peripheral portion of the spacer 232. Thereby, the washing water in the water tank 203 is prevented from leaking out of the water tank 203. Further, when the door 202 locks the outer box opening portion 211, the rear portion of the glass window 221 of the door 202 enters the drum 204 to overlap the spray area of the water supply nozzle 206. In addition, the said washing|cleaning water means the water containing a detergent, a softener, etc., or the water which does not contain a detergent, a softener, etc.. Similarly to the water tank 203, the drum 204 is inclined such that the rear portion is lower than the front portion. Further, a drum opening portion 241 that faces the water tank opening portion 231 is provided on the front surface of the drum 204. Further, a plurality of through holes 242 (only three are shown in FIG. 2) are provided on the peripheral wall of the drum 204 over the entire circumference. Further, the drum 204 accommodates the laundry 243. Further, the drum opening portion 241 is an example of a rotation groove opening portion. The through hole 242 allows washing water or air to flow between the space between the water tank 203 and the drum 204 and the space inside the drum 204. For example, when the laundry 243 in the drum 204 is dehydrated and the drum 204 is rotated, the washing water in the drum 204 flows out through the through hole 242 to the outside of the drum. The motor 205 includes, for example, a variable frequency motor and has a rotating shaft 251. The rotating shaft 251 is inclined with respect to a horizontal plane, and the front end portion is fixed to the center of the face after the water tank 203. Fig. 18 is a perspective view of the water tank 203 and its peripheral portion. FIG. 19 is a schematic cross-sectional view of the water tank 203 and its peripheral portion. As shown in Figs. 18 and 19, the water tank 203 is composed of a cylindrical water tank front portion 203a in which a water tank opening portion 231 is provided, and a bottomed cylindrical water tank rear portion 203b. The front end of the water tank rear portion 203b is fixed to the rear end portion of the water tank front portion 203a. Further, the water tank rear portion 203b is elastically supported by the suspension 207A and the suspension 7B. Fig. 20 is a perspective view showing the appearance of the water supply nozzle 206. 21 is a perspective view showing a state in which the water supply nozzle 206 is disassembled. As shown in FIGS. 20 and 21, the water supply nozzle 206 includes a nozzle body 261, a lid 262 attached to an end portion of the nozzle body 261 on the downstream side, and a swirling member 263 for generating a swirling flow. The nozzle body 261 includes a first nozzle tube 271 and a second nozzle tube 281 that is assembled to the first nozzle tube 271. The first nozzle tube 271 is provided with a plate-shaped first mounting portion 272 and a second mounting portion 273 that are attached to the water tank opening 231 by screws. The first attachment portion 272 and the second attachment portion 273 have through holes 274 through which the screws are inserted. Further, a plate-shaped stepped rib 276 is erected on the upper surface of the first mounting portion 272 in the drawing. The second nozzle tube 281 is provided with a plate-shaped mounting portion 282 attached to the water tank opening portion 231. The mounting portion 282 has a through hole 283 through which the screw is inserted. When the second nozzle tube 281 is assembled to the first nozzle tube 271, the through hole 283 of the attachment portion 282 overlaps with the through hole 274 of the first attachment portion 272. Accordingly, when the screw is inserted into the through hole 274 of the first mounting portion 272, the screw is also inserted into the through hole 283 of the mounting portion 282. Further, a hook portion 284 is erected on the upper surface of the mounting portion 282 in the drawing. When the second nozzle tube 281 is assembled to the first nozzle tube 271, the hook portion 284 can be released from the relatively lower portion of the stepped rib 276. Further, a triangular columnar projection 285 that protrudes outward in the radial direction is erected at an end portion on the upstream side of the outer circumferential surface of the second nozzle tube 281. When the second nozzle tube 281 is assembled to the first nozzle tube 271, the protruding portion 285 abuts against the end surface on the downstream side of the first nozzle tube 271. Further, an end portion on the downstream side of the outer circumferential surface of the second nozzle tube 281 is provided with an annular first rib 286 and an annular second rib 287 located on the downstream side of the first rib 286. The first rib 286 abuts against the end surface on the upstream side of the lid 262 to position the lid 262. On the other hand, the second rib 287 is fitted to the inner circumferential surface of the lid 262, so that the lid 262 is less likely to fall off from the second nozzle tube 281. The cover 262 is made of an elastic material such as rubber. Further, a discharge port 291 is provided on the front end surface of the lid 262, and tap water from the nozzle body 261 side passes through the discharge port 291. The rotator 263 is rotatably housed in the end portion on the downstream side of the second nozzle tube 281. Further, the rotator 263 has two portions 301 and 302 having a substantially semicircular plate shape in which the flow of the tap water is changed, and the cross-sectional shape is substantially X-shaped. Fig. 22 is a perspective view showing the appearance of the water supply nozzle 206 when viewed from the side opposite to Fig. 20. Fig. 23 is a perspective view for explaining the mounting of the water supply nozzle 206. A ring-shaped resin pad cover 233 is attached to the water tank opening 231 so as to be located behind the gasket 232. The water supply nozzle 206 is attached to the water tank opening portion 231 such that one of the water supply nozzles 206 overlaps the gasket cover 233. Further, a cylindrical connecting portion 313 is provided in the water tank opening portion 231. When the water supply nozzle 206 is attached to the water tank opening portion 231, the inner cylindrical portion 311 of the water supply nozzle 206 is inserted into the connection portion 313, and the outer cylindrical portion 312 of the water supply nozzle 206 is fitted to the connection portion 313. At this time, since the inner tubular portion 311 has a longer axial length than the outer tubular portion 312, the inner tubular portion 311 functions as a guide for guiding the tubular portion 312 of the water supply nozzle 206 to the connecting portion 313. (The shape of the discharge port of the water supply nozzle) The discharge port 291 of the water supply nozzle 206 of the present embodiment is the same as the opening shape of the discharge port 11 and the discharge port 51 described in the first or second embodiment, as shown in Fig. 20 . The structure has a wider portion, a narrower portion, and a connecting portion that functions as a wider portion and a narrower portion. Therefore, the effect of the water supply nozzle 206 is also the same as that of the above-described first and second embodiments. (Effects) According to the above-described washing machine, the washing water (tap water) ejected from the water supply nozzle 206 is a pulsating flow, so that the washing water 243 can be used as the washing object 243, and the washing water pressure and the washing area (a sense of quantity) can be achieved. . Further, since the washing area (a sense of volume) can be obtained by producing a large water mass, both the washing water pressure and the washing area can be increased by the pulsation flow and the size of the water mass. Further, in the case of the pulsating flow, since the surface area of the water droplets is small with respect to the volume and weight of the water droplets, the influence of the air resistance can be made relatively smaller than the influence of the gravity, so that it can be maintained until the object 235, which is the object to be impacted, is maintained. The water potential can suppress the decrease in water pressure. Therefore, it is possible to obtain an effect of obtaining a high detergency in a short period of time. Further, in the case of the pulsating flow, the washing can be completed because the water used is smaller than in the case of the continuous flow, so that the water saving performance can be improved. Further, in the case of the pulsating flow, since the laundry 234 can collide with the water of different sizes, it is possible to obtain a "release" effect which cannot be obtained when the water droplets of the same size continuously collide. Therefore, the washing machine having the above configuration does not have a structure that is extremely simple in terms of cost increase due to the addition of a complicated configuration, and it is possible to maintain the water potential up to the collision with the laundry 243 and to suppress the decrease in the water pressure. A high cleaning power is obtained, and the cleaning time can be shortened and the water saving performance can be improved. [Overall] The nozzle of the aspect 1 of the present invention is provided with a nozzle (1) for ejecting the discharge ports (11, 51) of the fluid, characterized in that at least a part of the opening area of the discharge port (11, 51) is contracted. According to the above configuration, at least a part of the opening area of the discharge port is contracted, and a portion having a wide area and a narrow portion are generated in the opening area. According to this configuration, depending on the relationship (balance) between the viscosity of the water and the surface tension at the time of ejecting from the discharge port, the narrower portion is longer in length than the wetting edge of the area, and the viscous resistance of the wall surface of the outlet is larger. Therefore, water is difficult to pass, and water is easily left due to the balance with the surface tension. On the other hand, the wider portion is shorter in length than the area wetting edge, and the viscous resistance of the wall surface of the outlet is small, so water easily passes, and water is not easily left due to the balance with the surface tension. Therefore, the wider portion is discharged before the narrower portion, and the narrower portion is slightly later than the wider portion. That is, the water is strongly ejected from a wider portion of the momentum, and the water is ejected slightly later from the narrower portion. Therefore, when the water surface to be sprayed has uneven pressure in the same plane, the pressure of the narrow portion of the suction port is lower than the pressure of the wider portion, and the air is attracted from the narrower portion, and the air is in the form of caulking. Enter into the water stream. Thereby, immediately after the ejection of a large group having a contracted shape, the water mass is immediately cut off by the attracted air. The water group cut off from it is gradually contracted from the joint portion due to the surface tension, and finally forms a space of air and is separated into a spherical shape. In terms of the shape of the discharge port, the water ejected from the wider portion advances to become a larger water droplet, and the water ejected from the narrower portion travels slightly later to separate into smaller water droplets. At this time, the larger water droplets and the smaller water droplets separated after the ejection are sequentially sprayed to the object to be cleaned, and since the spraying timings of the respective ones are different, the parts to be washed are compared with the area. In the case where the continuous continuous flow of water is continuously sprayed, the spray of the separated water droplets can generate a high collision energy and wash it, so that the washing performance is improved. Moreover, by including a larger water droplet ejected from a wider portion, the washing area is wider and a sense of volume is obtained, and since the larger water mass is dissipated in a shorter time than the continuous flow, the collision can be further improved. . Furthermore, it is possible to adjust the sense of quantity by performing various designs on the shape. Further, according to this configuration, the water droplets can be increased compared to the case where a plurality of continuous flows ejected from the small holes are arranged in a wide range, so that the surface area of the water droplets and the weight of the water droplets are small, so that The effect of the air resistance is relatively less than the influence of gravity, whereby the splash of water can be greatly reduced. Further, it is not necessary to use a complicated mechanism such as a special pressure generating mechanism, and the so-called pulsating flow which is extremely advantageous for the cleaning performance can be realized only by the design of the nozzle shape of the nozzle. Therefore, it is not necessary to add a complicated structure, and the cost is extremely simple, and the effect is that there is no unpleasant splash of water, and both the sense of volume and the increase in water pressure can be obtained. Detergency. The nozzle of the aspect 2 of the present invention is the aspect 1, wherein the opening region of the discharge port (11) includes at least two openings (the first opening region 11a, the second opening region 11b, and the third opening region 11c, a fourth opening region 11d) and a connecting portion that connects the openings (the first opening region 11a, the second opening region 11b, the third opening region 11c, and the fourth opening region 11d) to form one continuous opening region (No. 1 connection region 11e, second connection region 11f, and third connection region 11g), and the openings (the first opening region 11a, the second opening region 11b, the third opening region 11c, and the fourth opening region 11d) are equivalent to each other. Portions of the connecting portion (the first connecting region 11e, the second connecting region 11f, and the third connecting region 11g) are contractible. According to the above configuration, since the opening shape of the discharge port of the above-described aspect 1 is exhibited, the same effect as that of the above-described aspect 1 is obtained. In the nozzle of the aspect 3 of the present invention, the opening portion (the first opening region 11a, the second opening region 11b, the third opening region 11c, and the fourth opening region) may be formed in the opening region. In the 11d), the opening (the first opening region 11a) having the largest opening area is the center, and the remaining openings (the second opening region 11b, the third opening region 11c, and the fourth opening region 11d) are disposed around the opening. According to the above configuration, the remaining opening portion is disposed around the opening having the largest opening area, and the number of discontinuous water droplets can be arbitrarily set. In the nozzle of the aspect 4 of the present invention, as in the above aspect 2 or 3, the periphery of the opening region may be formed only by a smooth curve. According to the above configuration, since the peripheral edge of the opening region is formed only by the smooth curve, the above-described effects can be obtained without hindering the flow when the water is discharged from the discharge port. Thereby, compared with the case where it is not formed smoothly, it is possible to suppress the decrease in the flow rate without increasing the performance of the pump or the like, and it is possible to increase the washing performance more efficiently. In the nozzle of the aspect 5 of the present invention, as in any of the above aspects 1 to 4, one of the flow paths (23a) of the fluid discharge port of the discharge port (23) may be inclined. According to the above configuration, since one of the flow paths through which the fluid is ejected from the discharge port is inclined, the guide portion of the discharge direction (angle) of the fluid can be blown out in a stable direction. In this way, in the toilet or the like, the fluid can be appropriately blown out to the user in a direction (oblique direction) in which the object to be cleaned is applied, so that the washing performance can be further improved. In the nozzle of the aspect 6 of the present invention, as in the first aspect, the shielding port (51) may be formed with a shielding portion (52, 53, 54) that shields at least a part of the opening region (51a). According to the above configuration, since the opening shape of the discharge port of the above-described aspect 1 is exhibited, the same effect as that of the above-described aspect 1 is obtained. In the nozzle of the aspect 7 of the present invention, in the above aspect 6, the shielding portion (52, 53, 54) may block the flow of the fluid in the flow path for discharging the fluid of the discharge port (51). A portion of the portion is narrowed in such a manner as to be narrowed. According to the above configuration, depending on the relationship (balance) between the viscosity of the water and the surface tension when ejecting from the discharge port, the portion which is blocked by the convex shape is blocked, and the length of the wetting edge with respect to the area is long. The viscous resistance of the wall of the blowout outlet is large, so water is difficult to pass. Therefore, the wider portion comes out of the narrower portion. The narrower portion is slightly later than the wider portion. That is, water is strongly ejected from a relatively wide part of the momentum, and water is ejected slightly later from the narrower portion. Therefore, the same effect as the above-described aspect 1 is obtained. The fluid ejecting apparatus according to aspect 8 of the present invention is characterized in that it is provided with a fluid ejecting device (body 3) of a nozzle (1) for ejecting a fluid, and the nozzle (1) is in any of the above aspects 1 to 7. Sample nozzle. According to the above configuration, the structure is not extremely complicated due to the addition of a complicated configuration, and there is no unnecessary splash of the fluid, and both the sense of mass increase and the water pressure can be improved. A washing machine according to a ninth aspect of the present invention is characterized in that the washing machine (portable buttocks washer 100) is provided with a nozzle for discharging washing water to a washing target, and the nozzle is in the above-described aspect 1 to No. 7 nozzle. According to the above-described configuration, it is possible to prevent the increase in cost due to the addition of a complicated configuration, and it is possible to achieve an effect that the amount of splashing of the washing water and the increase in the water pressure can be achieved without the effect of the splash of the washing water. A high cleaning power is obtained, and the cleaning time can be shortened and the water saving performance can be improved. The washing machine according to a tenth aspect of the present invention includes an outer box 201 having an outer box opening portion 211, and a water tank 203 disposed in the outer box 201 and having a water tank opening portion 231 facing the outer box opening portion 211; The rotation groove (roller 204) is rotatably disposed in the water tank 203, and has a rotation groove opening portion (the drum opening portion 241) facing the water tank opening portion 231, and a water supply nozzle 206 that discharges water from the discharge port 291. The water supply nozzle 206 is the nozzle of any one of the first to seventh embodiments. According to the above-described configuration, the configuration is not extremely complicated due to the addition of a complicated configuration, and the effect of maintaining the water potential until the laundry is hit can be maintained by suppressing the decrease in the water pressure. The high cleaning power, in addition, can shorten the washing time and improve the water saving performance. The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the patent application. The embodiments obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the technical scope of the present invention. . Further, it is possible to form novel technical features by combining the technical means disclosed in each of the embodiments.