(發明所屬之技術領域） 本發明係關於生產合成絲線及纖維所用之噴嘴裝置， 它有一基座，承載一噴嘴組合，該噴嘴組合是由一噴嘴裝 置上端部份、一支撑部份及一噴嘴管口組成。 生產合成絲線及纖維的熔融旋轉抽絲工廠至少有一個 噴嘴裝置，已知的熔融旋^抽絲工廠所使用的噴嘴裝置， 有一個基座，承載一噴嘴組合，一般來說，噴嘴組合是由 一噴嘴上端部份、一支撐部份及噴嘴管口組成，它們是順 著流動方向一個挨著一個排列在一起。 (先前技術） 德國DE 42 36 570 A1與DE 33 24 833 A1文獻所揭示的 噴嘴裝置，是由一噴嘴上端部份及一裝在圓柱形的基座裡 的噴嘴管口組成的。 歐洲專利組織EP 0 931 863 A2 (美國US — A5 662 947) 所述之噴嘴裝置，有一上開型式的噴嘴組合，在這個專利 案內，有一圓錐形環狀的封緘片，它封住噴嘴組合與支撐 板的連接處，在這圓錐形環狀的封緘片內，裝著一對外沖 洗的排水體，其外緣有孔，該碗形支撐板就被插入基座的 板形噴嘴所撐住，而碗形支撐板在這情形下，也就倚靠在 噴嘴板的外周邊緣上，此外，在支撐板與噴嘴板間的周邊 上還裝有一環狀封緘片，這噴嘴上端部份與支撐元件就這 樣互相由夾圏支撐著。 這碗形支撐板係繞著一圓柱形由壓力作成的存放過濾 介質的空間，當壓力施到這過濾空間，熔漿就會產生一種 3續次頁（發明說明頁不敷使用時，請註記並使用續頁）(Technical field to which the invention belongs) The present invention relates to a nozzle device for producing synthetic yarns and fibers. It has a base that carries a nozzle assembly. The nozzle assembly is composed of an upper end portion of a nozzle device, a support portion and a nozzle. Nozzle composition. At least one nozzle device is used in a fusion spinning factory for producing synthetic yarns and fibers. The nozzle device used in the known fusion spinning factory has a base that carries a nozzle assembly. Generally speaking, the nozzle assembly consists of An upper part of a nozzle, a supporting part and a nozzle orifice are formed, which are arranged next to each other along the flow direction. (Prior art) The nozzle device disclosed in German DE 42 36 570 A1 and DE 33 24 833 A1 is composed of an upper end portion of a nozzle and a nozzle orifice installed in a cylindrical base. The nozzle device described in European Patent Organization EP 0 931 863 A2 (United States US-A5 662 947) has a nozzle assembly with a top-opening type. In this patent, there is a conical ring-shaped sealing piece that seals the nozzle assembly At the connection point with the support plate, in this conical ring-shaped sealing piece, there is a drainage body flushed out, and the outer edge has holes, and the bowl-shaped support plate is supported by the plate-shaped nozzle inserted into the base. In this case, the bowl-shaped support plate also rests on the outer peripheral edge of the nozzle plate. In addition, a ring-shaped sealing piece is installed on the periphery between the support plate and the nozzle plate. The upper end portion of the nozzle and the support element In this way, they are supported by each other. This bowl-shaped support plate surrounds a cylindrical space for storing filter media made of pressure. When pressure is applied to this filter space, the molten slurry will generate a 3-continued page. And use continuation pages)
輻射般的力量，壓到周邊的環狀封緘片，結果是··封緘片 的外圓周表面與周肩的內圓周表面間雖得以封閉，以防止 熔漿向外溢出，但熔漿也會衝過封緘片與周肩間的水平間 隙，同時也有穿過支撐板的風險，當過度的沈澱現象發生 在封緘元件上，因爲缺少軸向的支撐緣故，這些間隙就會 增加，所以，當過濾空間與噴嘴組合不論是否受到壓力或 在無壓力狀態下，基本上都有這樣的風險。 再者，當壓力施加在過濾空間，封緘片的構成物質就 會流到這些間隙，其時，這會導致基座內的殘渣積聚起來 ，甚難去除，所以這也是一種風險。 此外，還有一個缺點，就是過濾物質，特別是濾砂， 很難自碗形的支撐元件排出·這種殘渣經常還會佇留在碗 形的支撐元件上，這也成爲另外一種缺點。 (內容） 本發明旨在提供一噴嘴裝置，其中噴嘴組合，無論過 濾空間受到壓力或在無壓力狀態下，足可與其基座達成密 封，以確保產品的品質良好。 此項目的，根據本發明，可由申請專利範圍第1項所 定之特徵達成。 本發明的具體優點是附屬請求事項的主題。 噴嘴裝置中的噴嘴組合，根據本發明，是一個可以自 行密封的組合。當壓力加諸在過濾空間時，噴嘴組合中的 支撐元件就會壓到噴嘴口。噴嘴組合本係由基座支撐，其 方式是，當壓力用在過濾器空間時，其支撐元件與噴嘴口 發獅明續頁 趣::::::麵_義__ 就軸向的壓緊而告密封。 支撐兀件，基本上，不是支撐在噴嘴口上，而是完全 支擦在密封器上，因此，密封器就會軸向擠壓。如此才能 確保熔漿不能穿過支撐板與噴嘴口之間的水平間隙，同時 也不能穿過密封器與噴嘴口間的間隙。 然根據本發明的噴嘴裝置，其基座裡的支撐元件它移Radial force is pressed to the surrounding annular sealing sheet. As a result, although the outer peripheral surface of the sealing sheet and the inner peripheral surface of the peripheral shoulder are closed to prevent the melt from overflowing outward, the melt will also flush. The horizontal gap between the overseal tab and the peripheral shoulder also risks passing through the support plate. When excessive precipitation occurs on the sealing element, these gaps will increase due to the lack of axial support. Therefore, when filtering space Whether combined with a nozzle or not, under pressure, there is basically such a risk. Furthermore, when pressure is applied to the filtering space, the constituent materials of the sealing sheet will flow to these gaps. At this time, this will cause the residue in the base to accumulate and be difficult to remove, so this is also a risk. In addition, there is also a disadvantage that it is difficult to discharge the filtering material, especially the filter sand, from the bowl-shaped supporting element. This residue often remains on the bowl-shaped supporting element, which also becomes another disadvantage. (Content) The present invention aims to provide a nozzle device, in which the nozzle combination can sufficiently seal the base of the nozzle unit under pressure or under no pressure to ensure good product quality. According to the present invention, this item can be achieved by the features specified in item 1 of the scope of patent application. A specific advantage of the invention is the subject of the dependent claims. The nozzle assembly in the nozzle device is a self-sealing assembly according to the present invention. When pressure is applied to the filter space, the supporting elements in the nozzle assembly are pressed against the nozzle opening. The nozzle assembly is supported by a base. The method is that when pressure is used in the filter space, the support element and the nozzle mouth are liquefied. Continued :::::: 面 _ 义 __ The axial pressure Keep it tight. The supporting element is basically not supported on the nozzle opening, but is completely rubbed on the seal, so that the seal is squeezed axially. This is to ensure that the melt cannot pass through the horizontal gap between the support plate and the nozzle opening, nor can it pass through the gap between the sealer and the nozzle opening. However, according to the nozzle device of the present invention, the supporting element in its base moves
動自由度是受一停止器所限制。這停止器足以確保其密封 器不會因過度沖激而變形。 A 不管兀件的公差如何，根據本發明的噴嘴裝置，當壓 力加諸過濾空間，與過濾空間在沒有壓力的狀態下都能確 保可靠的密封。此因支撐元件與噴嘴口之間的密封器受到 壓力時，會發生軸向的擠壓作用之故。 再者，還有一有利的優點是基座絕不會與產品的熔流 相接觸，而它只作爲噴嘴組合的軸向支撐。又因基座並不 吸收任何軸向的力，所以不需要很厚的牆。結果是其基座 尺寸也不需要太大。 在一特別偏好的實體，支撐元件有一個肩，向外接觸 噴嘴口，支撐元件的停止器是基座內支撐架下方的一個軸 環。因爲支撐元件的肩係是環形圍繞著密封器而形成一空 室來承載密封器。這一空室是爲阻擋密封器材料在高壓下 流動的。 支撐元件的肩與基座的軸環的設計最好是能在支撐元 件與插入的噴嘴口之間作好密封。當過濾器空間沒有壓力 時，這裡一定有一個確定的間隙。間隙的尺寸必須是：即 發明說明續頁 使在密封器固定後，支撐元件不會將肩倒放在軸環上。 噴嘴組合是軸向支撐在基座上的，最好是用一個插入 環，扭緊到基座。爲了密封噴嘴組合，只需要一個很低的 預力就足夠了。此因在過濾器空間的內壓是用來產生所需 壓力的。 密封方法最好是由一在支撐元件與噴嘴口.之間安置一 平面密封物所形成的，它環繞著一單層或多層過濾器。除 了平面密封物與一分離的過濾器之外，那個被稱是一個有 框的單層或多層過濾器，也可以放在支撐元件與噴嘴口之 間。這一型式的過濾器有一或多層的篩網，用一環槽框起 來。它最好是一個環，特別是鋁環，有一平面U形或C形 橫切面，它環繞著那些網層。 噴嘴裝置上部與支撐元件的分隔平面最好是用環形密 封物密封著。它位於噴嘴裝置上部與支撐元件周圍的低凹 處。如此過濾器空間就不會有死角與間隙。 較好的實體是，噴嘴頭上部有兜帽形的設計，其支撐 元件則是一支撐板。這個實體的優點是，與有碗形支撐元 件的噴嘴組合比，將過濾介質送入與移出過濾空間，特別 是過濾砂，就很簡單。在拆除噴嘴組合時，黏附在支撐板 上的瀘餅就會鬆開。當噴嘴裝置上部被打開時，它會完全 沒有濾餅以及濾渣留存在裡面。 其目的是能在一旋轉成形樑上有多數的噴嘴裝置連接 在一起，這就是說噴嘴裝置的外徑是愈小愈好。 另一個偏好的實體是，能使可替換的噴嘴裝置釘在整 1221863 發嚇明續頁 個旋轉抽絲系統或旋轉抽絲樑上的工作得以迅速做好。固 \ 定器係在噴嘴裝置上部。固定器是一種方便型的刺刀固定 。因爲固定器的開關扭力，是由基座加到噴嘴頭的上部， 噴嘴頭上部在基座裡本是不會扭轉的。 (實施方式） 下面是噴嘴裝置實例體，倂請參考所附的圖式： 圖式1爲噴嘴裝置第一個實例體裡的基座與噴嘴組合 透視圖。 圖式2爲圖式1噴嘴裝置的斷面圖。 圖式3爲圖式2細節A的放大圖。 圖式4爲噴嘴裝置第二個實例體的斷面圖。 圖式5爲圖式4細節B的放大圖。 圖式1顯示噴嘴裝置1第一個實例體的透視圖。圖中 噴嘴裝置1有一個主要的管狀基座2，它承載一噴嘴組合 3。基座2的構造是依照所謂上部承載原理，這就是說， 這些詳如下述的個別元件，都是噴嘴組合3的構成部份， 是由上插入基座。圖式1所示的是基座於使用時的位置。 它被固定在一旋轉抽絲樑上。產品流程在圖式1是以A表 示的。 噴嘴組合3有一噴嘴口 4、一支撐板5以及一噴嘴頭 上部6。噴嘴口 4是一個圓形的盤，有一些連續的孔7， 其中只有兩個孔在圖式1顯示出來。它是由外圓周的肩8 支撐在一基座2下方內圓周的肩9上。 支撐板5係一板形的實體10,有一些連續的分配線11 11The degree of freedom of movement is limited by a stop. This stopper is sufficient to ensure that its seal is not deformed by excessive shock. A Regardless of the tolerance of the element, according to the nozzle device of the present invention, when pressure is applied to the filtering space, the filtering space and the filtering space can be reliably sealed without pressure. This is because when the seal between the support member and the nozzle opening is pressed, an axial squeezing action occurs. Furthermore, there is an advantageous advantage that the base will never come into contact with the melt flow of the product, and it only serves as an axial support for the nozzle assembly. Since the base does not absorb any axial forces, no thick walls are required. As a result, its base size need not be too large. In a particularly preferred entity, the support element has a shoulder that contacts the nozzle opening outwards, and the stop of the support element is a collar under the support frame in the base. Because the shoulder of the support element is annularly surrounding the seal, a cavity is formed to carry the seal. This cavity is designed to block the flow of sealer material under high pressure. The shoulder of the support element and the collar of the base are preferably designed to seal between the support element and the inserted nozzle opening. When there is no pressure in the filter space, there must be a certain clearance here. The size of the gap must be: that is, the description of the invention continued page so that after the seal is fixed, the support element does not place the shoulder on the collar. The nozzle assembly is supported axially on the base, preferably with an insert ring, and tightened to the base. To seal the nozzle assembly, only a very low pre-force is required. This is because the internal pressure in the filter space is used to generate the required pressure. The sealing method is preferably formed by placing a flat seal between the support member and the nozzle opening, which surrounds a single-layer or multi-layer filter. In addition to the flat seal and a separate filter, the single or multi-layer filter, which is called a frame, can also be placed between the support element and the nozzle opening. This type of filter has one or more screens and is framed by a ring groove. It is preferably a ring, especially an aluminum ring, with a flat U-shaped or C-shaped cross-section that surrounds the mesh layers. The separating plane between the upper part of the nozzle device and the supporting member is preferably sealed with a ring-shaped seal. It is located in the lower recess around the upper part of the nozzle unit and around the support element. In this way, there will be no blind spots and gaps in the filter space. A better entity is that the upper part of the nozzle head has a hood-shaped design, and its supporting element is a supporting plate. The advantage of this entity is that compared with the nozzle combination with a bowl-shaped support element, it is simple to send and remove filter media into and out of the filter space, especially filter sand. When the nozzle assembly is removed, the cake attached to the support plate will loosen. When the upper part of the nozzle unit is opened, it will be completely free of cake and residue. The purpose is to be able to connect a large number of nozzle devices on a rotating forming beam, which means that the smaller the outer diameter of the nozzle device, the better. Another preferred entity is the ability to nail the replaceable nozzle unit to the entire 1221863 frightening continuation page of the rotary spinning system or rotary spinning beam. The fixture is attached to the upper part of the nozzle unit. The holder is a convenient bayonet holder. Because the turning torque of the holder is added by the base to the upper part of the nozzle head, the upper part of the nozzle head will not twist in the base. (Embodiment) The following is an example of a nozzle device. Please refer to the attached drawings: Figure 1 is a perspective view of a combination of a base and a nozzle in the first example of a nozzle device. Figure 2 is a sectional view of the nozzle device of Figure 1. Figure 3 is an enlarged view of detail A of Figure 2. Figure 4 is a sectional view of a second example body of the nozzle device. FIG. 5 is an enlarged view of detail B of FIG. 4. Figure 1 shows a perspective view of a first example body of the nozzle device 1. The nozzle device 1 in the figure has a main tubular base 2 which carries a nozzle assembly 3. The structure of the base 2 is based on the so-called upper load principle, which means that these individual components, as described below, are all part of the nozzle assembly 3 and are inserted into the base from above. Figure 1 shows the position of the base when in use. It is fixed on a spinning wire beam. The product flow is shown as A in Figure 1. The nozzle assembly 3 has a nozzle opening 4, a support plate 5, and a nozzle head upper portion 6. The nozzle opening 4 is a circular disk with a number of continuous holes 7, of which only two are shown in Figure 1. It is supported by shoulders 8 on the outer circumference on shoulders 9 on the inner circumference below the base 2. The support plate 5 is a plate-shaped solid 10 with some continuous distribution lines 11 11
1221863 ’它還有一向上的周邊延伸部份12及向下的周邊延伸部份 13。向下的周邊延伸部份13並有一向下的水平密封表面14 ’連結到肩15，它又往下延伸而連接到支撐板4 (圖式3 )。肩15,有一長方形斷面，在其內部形成一垂直的密封 表面16,在肩15之下，基座2有一軸環17。 與噴嘴口 4有關的支撐板5，是由一框架的多層過濾 器18密封的，它被安排在支撐板與噴嘴口之間。這個多層 過濾器18有一系列的篩網層19，由鋁製密封環20的框架著 ，它有一 U形的斷面。這個密封環20在室中被噴嘴口 4的 水平密封表面21、與支撐板5的水平密封表面14以及垂直 密封表面16所限制。 在有框架的多層過濾器18上面，有一分配空間22,高 約0.5到4毫米。由支撐板5與噴嘴口 4所形成。但是這 一個的分配空間基本上是不需要的。 碗形噴嘴頭上部6有一覆蓋部份23以及一圓柱部份24 ，藉此，噴嘴頭上部得以靠在支撐板5的外周肩12的上端 。噴嘴裝置上部6及支撐板5包圍著一圓柱形過濾器空間 25。 噴嘴裝置上部完全包圍著過濾器空間25,以壓力壓緊 得像一兜帽似的，因爲過濾器空間25能用砂塡滿’故過濾 器空間也可稱爲砂空間，個別的過濾器26,它們靠著支撐 板10,也可鬆鬆的被插在砂空間中，個別過濾器的數目， 係由過濾程度以及結果的壓力差決定之。 噴嘴裝置上部6的圓柱部份24與支撐板10的上肩12間 121221863 ′ It also has an upward perimeter extension 12 and a downward perimeter extension 13. The downward peripheral extension 13 is connected to the shoulder 15 with a downward horizontal sealing surface 14 ', which in turn extends downward to the support plate 4 (Figure 3). The shoulder 15 has a rectangular cross-section, and a vertical sealing surface 16 is formed in the inside. Below the shoulder 15, the base 2 has a collar 17. The support plate 5 associated with the nozzle opening 4 is sealed by a framed multilayer filter 18, which is arranged between the support plate and the nozzle opening. This multilayer filter 18 has a series of screen layers 19, framed by an aluminum sealing ring 20, which has a U-shaped cross section. This seal ring 20 is limited in the chamber by the horizontal sealing surface 21 of the nozzle opening 4, the horizontal sealing surface 14 and the vertical sealing surface 16 of the support plate 5. Above the framed multilayer filter 18, there is a distribution space 22, about 0.5 to 4 mm high. It is formed by the support plate 5 and the nozzle opening 4. But this one's allocation space is basically not needed. The upper portion 6 of the bowl-shaped nozzle head has a covering portion 23 and a cylindrical portion 24, whereby the upper portion of the nozzle head can rest on the upper end of the outer shoulder 12 of the support plate 5. The nozzle unit upper portion 6 and the support plate 5 surround a cylindrical filter space 25. The upper part of the nozzle device completely surrounds the filter space 25, and it is compressed like a hood with pressure. Because the filter space 25 can be filled with sand, the filter space can also be called sand space. Individual filters 26 They can also be loosely inserted into the sand space against the support plate 10. The number of individual filters is determined by the degree of filtration and the resulting pressure difference. Between the cylindrical portion 24 of the upper part 6 of the nozzle device and the upper shoulder 12 of the support plate 10 12
1221863 的分離平面27是用環槽密封器28密封的。環槽密封器28就 在環形凹槽29裡，它係由圓柱部份24與肩12所形成，與砂 空間25的牆平。 噴嘴裝置上部6的覆蓋部份23有一中央凹槽30,作爲 刺刀固定的鞘，因此，使高架的噴嘴裝置1得以架空與旋 轉抽絲樑的熔漿供應線相連接（並未顯示於圖上），聚合 物係經由位於覆蓋部低凹處30中央的熔漿線31輸入過濾器 空間25,要封閉噴嘴裝置與熔漿供應間的通道，一個袖套 式的密封器32就被裝在熔槳線31裡。 一個以螺絲釘釘在基座2的插入環33,它被用來支 撐基座中的噴嘴組合3,這個插入環33,係有噴嘴裝置上 部6覆蓋部份23外軸環34的支撐，足可對噴嘴組合3施 加一軸向預力，它在無壓力狀態下，還能使用環形密封器 20封住支撐板5與噴嘴口 4間的連接處，在這裡，噴嘴裝 置上部6及支撐板5在基座2中，都沒有什麼作用，當壓 力到達過濾砂空間25時，支撐板5就被壓到密封環20, 這時’噴嘴裝置上部與支撐板間的分離平面27也就被徑向 壓到密封器表面的環狀密封器28而封合起來，所以，支撐 板與噴嘴口之間的密封環20祗受到軸向的壓力，框架內過 濾器18的物料被阻止流動，支撐板5的外肩15以及基座2 的軸環17的尺寸是在無壓力狀態下，肩與軸環之間已有一 定的間隙X!，當壓力下來後間隙就會縮小，一直到支撐板 貼到基座爲止，故其軸向移動的自由度是有限的。 噴嘴裝置上部6是用拴35、36固定在基座2上，不會 13The separation plane 27 of 1221863 is sealed with a ring groove seal 28. An annular groove seal 28 is located in the annular groove 29, which is formed by the cylindrical portion 24 and the shoulder 12, and is flat with the wall of the sand space 25. The covering part 23 of the upper part 6 of the nozzle device has a central groove 30 as a sheath fixed by the bayonet. Therefore, the elevated nozzle device 1 can be overhead connected with the melt supply line of the rotating wire drawing beam (not shown in the figure). The polymer is input into the filter space 25 through the melt line 31 located in the center of the low recess 30 of the covering part. To close the passage between the nozzle device and the melt supply, a sleeve-type seal 32 is installed in the melt Paddle line 31 miles. An insertion ring 33 screwed to the base 2 is used to support the nozzle combination 3 in the base. This insertion ring 33 is supported by the outer collar 34 of the upper part 6 of the nozzle device 23 An axial preload is applied to the nozzle assembly 3, and it can also use a ring seal 20 to seal the connection between the support plate 5 and the nozzle opening 4 in a pressureless state. Here, the nozzle device upper portion 6 and the support plate 5 In the base 2, there is no effect. When the pressure reaches the filter sand space 25, the support plate 5 is pressed to the seal ring 20, and the separation plane 27 between the upper part of the nozzle device and the support plate is pressed radially. It is sealed to the annular seal 28 on the surface of the seal. Therefore, the seal ring 20 祗 between the support plate and the nozzle opening is subjected to axial pressure, and the material of the filter 18 in the frame is prevented from flowing. The dimensions of the outer shoulder 15 and the collar 17 of the base 2 are under no pressure. There is a certain gap X! Between the shoulder and the collar. When the pressure is reduced, the gap will be reduced until the support plate is attached to the base. Up to the seat, the freedom of axial movement is limited. The upper part 6 of the nozzle device is fixed on the base 2 with bolts 35 and 36,
1221863 扭動的。 噴嘴裝置的功能可簡單的說明如下。 經由熔漿供應設I十（並不顯示在圖上），聚合物係循 11 貝嘴裝置上邰6的熔漿線31，進入砂空間25，在那裡聚合 物經砂過濾並穿過個別的過濾器後，才來到支撐板5的分 配孔11，然後進入分配空間22。在通過多層過濾器18後， 熔漿就進入噴嘴口 4的噴嘴管7，如此絲或纖維纔由噴嘴 口出來。 要拆卸噴嘴裝置1，只須放開插入環33並將噴嘴裝置 上口卩6自基座2拔出。在這同時，黏附在支撐板5的濾砂 也會脫離過濾益空間25的牆而不留下任何殘餘物。其後， 濾砂連同支撐板5與噴嘴口 4 一倂自基座2取出。再依據 相反的次序，將噴嘴裝置重新安裝回去就好。 圖式4及圖式5所示，爲第二個噴嘴裝置的實例體。 這個實例體與圖式1及3所不同者只有在支撐板與噴嘴口 之間，僅用一多層過濾器以及一個分離式的環形密封器來 取代有框邊的多層過濾器。在圖式4與圖式5中與圖式1 與圖式3相當的噴嘴裝置係用同樣代號來表示的。在圖式 4與圖式5中，多層過濾器係用代號37表示，其環形密封 器係用代號38表示。這個環形密封器38，只是軸向移動， 它含有一彈性物質並有一長方形的切面。此外，這兩個實 例體的結構與功能皆相同。 141221863 Twisted. The function of the nozzle device can be briefly described as follows. Through the melt supply device I (not shown in the figure), the polymer follows the melt line 31 of the 贝 6 on the 11-beaker device and enters the sand space 25, where the polymer is filtered by sand and passed through individual After the filter, it comes to the distribution hole 11 of the support plate 5 and then enters the distribution space 22. After passing through the multilayer filter 18, the melt enters the nozzle tube 7 of the nozzle opening 4, so that the filaments or fibers come out of the nozzle opening. To remove the nozzle unit 1, it is only necessary to release the insertion ring 33 and pull out the nozzle unit upper opening 卩 6 from the base 2. At the same time, the filter sand adhered to the support plate 5 will also leave the wall of the filter space 25 without leaving any residue. After that, the filter sand is taken out of the base 2 together with the support plate 5 and the nozzle opening 4. Follow the reverse order and reinstall the nozzle unit. Figures 4 and 5 show examples of the second nozzle device. This example differs from Figures 1 and 3 only in that it is between the support plate and the nozzle opening, and only a multilayer filter and a separate ring seal are used to replace the multilayer filter with a frame edge. In FIGS. 4 and 5, the nozzle devices corresponding to FIGS. 1 and 3 are denoted by the same reference numerals. In Figures 4 and 5, the multilayer filter is designated by the code 37, and the annular seal is designated by the code 38. This annular seal 38, which moves only axially, contains an elastic substance and has a rectangular cut surface. In addition, the structures and functions of these two instances are the same. 14