JPH08156025A - Valve nozzle - Google Patents
Valve nozzleInfo
- Publication number
- JPH08156025A JPH08156025A JP6331773A JP33177394A JPH08156025A JP H08156025 A JPH08156025 A JP H08156025A JP 6331773 A JP6331773 A JP 6331773A JP 33177394 A JP33177394 A JP 33177394A JP H08156025 A JPH08156025 A JP H08156025A
- Authority
- JP
- Japan
- Prior art keywords
- spool
- resin
- coil spring
- ring
- gate direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/234—Valves opened by the pressure of the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、合成樹脂の成形機に利
用されるバルブノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve nozzle used in a synthetic resin molding machine.
【０００２】[0002]
【従来の技術】バルブノズルとしては、ノズルヘッドの
先端のゲートにシャットオフピンの先端を当接させて流
路の開閉を行なうもので、シャットオフピンは密閉室に
内蔵されているコイルバネによりゲート方向に付勢され
ており、樹脂の圧力がある値以上になりコイルバネの付
勢力に打ち勝つと、密閉室内方向に移動しゲートが開と
なる構成のものが特開昭５７−１６３５４２号公報に示
されている。2. Description of the Related Art As a valve nozzle, a gate at the tip of a nozzle head is brought into contact with the tip of a shut-off pin to open and close a flow path, and the shut-off pin is gated by a coil spring built in a sealed chamber. JP-A-57-163542 discloses a structure in which the gate is opened when the resin pressure exceeds a certain value to overcome the biasing force of the coil spring and the gate is opened in the closed chamber. Has been done.
【０００３】また、ノズルヘッドの内部空間に円孔を有
するリングを配置し、この円孔にスプールの先端を係合
させることで流路を閉とし、この状態をスプールに係合
するコイルバネの反ゲート方向への付勢力により維持さ
せ、樹脂の圧力がある値以上になりコイルバネの付勢力
に打ち勝つと、スプールがゲート方向に移動して、スプ
ールのヘッドの一部に溝が用意されているのでリングの
円孔との間に流路が形成される構成のものが特開昭６１
−２９００２１号公報に示されている。Further, a ring having a circular hole is arranged in the inner space of the nozzle head, and the tip of the spool is engaged with the circular hole to close the flow path. When the resin pressure exceeds a certain value and overcomes the biasing force of the coil spring, the spool moves in the gate direction and a groove is prepared in a part of the spool head. A structure in which a flow path is formed between the ring and the circular hole is disclosed in Japanese Patent Laid-Open No. Sho 61-61.
-290021 publication.
【０００４】[0004]
【発明が解決しようとする課題】前記した特開昭５７−
１６３５４２号公報に示されているこの方式のものは、
樹脂の圧力が直接に及ばない密閉室が必要であり、シャ
ットオフピンを摺動可能に支持する部分から密閉室内に
樹脂が入り込むと作動不能となるので、製作には高精度
が要求されるだけでなく、樹脂の侵入を完全に防止する
ことは不可能であり、樹脂の侵入、侵入した樹脂の劣化
や分解などにより作動不能となるので、寿命が短いとい
う難点がある。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
This system, which is disclosed in Japanese Patent No. 163542,
It is necessary to have a closed chamber that the resin pressure does not reach directly, and if the resin enters into the closed chamber from the part that slidably supports the shutoff pin, it will be inoperable, so only high precision is required for manufacturing. In addition, it is impossible to completely prevent the intrusion of the resin, and the resin becomes inoperable due to the intrusion of the resin, the deterioration and the decomposition of the invaded resin, and thus there is a drawback that the life is short.
【０００５】このような難点を克服するものとして前記
した特開昭６１−２９００２１号公報に示されている構
成のものが提案された。この方式では、スプールに加わ
る樹脂の圧力差、即ち、スプールの後部に取り付けられ
ている突起の断面積と軸の断面積を加えた分で算出され
る樹脂のゲート方向圧力と、軸の断面積分を差し引いた
分で算出される樹脂の反ゲート方向圧力との差によりコ
イルバネの付勢力に打ち勝ってスプールがゲート方向に
若干移動して流路を形成するため、前記した特開昭５７
−１６３５４２号公報に示されている構成と異なり、コ
イルバネを密閉室に収納する必要がないので、製作に当
たり要求される精度が緩やかであり、また、ノズルヘッ
ド内に樹脂が滞留することがないことが利点とされてい
る。As a means for overcoming such a difficulty, the structure shown in the above-mentioned JP-A-61-290021 has been proposed. In this method, the pressure difference between the resin applied to the spool, that is, the gate direction pressure of the resin calculated by adding the cross-sectional area of the protrusion attached to the rear part of the spool and the cross-sectional area of the shaft, and the cross-sectional integral of the shaft. Since the difference between the resin and the pressure in the anti-gate direction calculated by deducting the value overcomes the urging force of the coil spring, the spool slightly moves in the gate direction to form the flow path.
Unlike the configuration disclosed in Japanese Patent Publication No. 163542, since it is not necessary to store the coil spring in the closed chamber, the precision required for manufacturing is low, and the resin does not stay in the nozzle head. Is an advantage.
【０００６】然しながら、この方式によると、スプール
のヘッド部分に形成されている小さな溝により流路が形
成され、コイルバネ部分を通過する樹脂には、速やかに
通過する分と停滞する部分、即ち分流が生じることとな
り、所謂樹脂の焼けや変色を生じることが判明した。However, according to this system, a flow path is formed by a small groove formed in the head portion of the spool, and the resin passing through the coil spring portion has a portion that quickly passes and a portion that stagnates, that is, a shunt. Therefore, it was found that so-called resin burning and discoloration occur.
【０００７】上記から明らかなように、本発明は、バル
ブノズル内部で一部の樹脂が停滞することがなく全量が
速やかに排出され、樹脂の焼けや変色を生じることがな
いバルブノズルを明らかにすることを目的とするもので
ある。As is clear from the above, the present invention clarifies a valve nozzle in which a part of the resin is not stagnant inside the valve nozzle and the entire amount is promptly discharged to prevent burning or discoloration of the resin. The purpose is to do.
【０００８】[0008]
【課題を解決するための手段】本発明に係るバルブノズ
ルは、ノズルヘッドの内部空間に、断面円形のヘッド
部分とこのヘッド部分の直径よりも小さな直径を有する
断面円形の軸部と矢羽状突起を有するスプールと、該ス
プールのヘッド部分の外周に当接する円孔を有するリン
グと、該スプールを反ゲート方向に付勢するコイルバネ
とを配置し、樹脂の圧力がある一定値以下である時には
前記スプールが前記コイルバネにより反ゲート方向に付
勢されて前記スプールのヘッド部分と前記リング円孔と
の間の樹脂の流路が閉となり、樹脂の圧力がある一定値
以上になると前記コイルバネの付勢力に打ち勝って前記
スプールがゲート方向に移動され、前記スプールの軸部
の外周と前記リングの円孔との間に環状の樹脂流路が形
成されて樹脂の流路が開となり、樹脂が前記コイルバネ
による螺旋に従って旋回しながら押し出されること、
リングがコイルバネを被包する円筒体と一体に形成され
ていること、をそれぞれ特徴とする。SUMMARY OF THE INVENTION A valve nozzle according to the present invention comprises a head portion having a circular cross section, a shaft portion having a circular cross section having a diameter smaller than the diameter of the head portion, and a wing shape in the inner space of the nozzle head. A spool having a protrusion, a ring having a circular hole that abuts on the outer periphery of the head portion of the spool, and a coil spring that biases the spool in the anti-gate direction are arranged, and when the resin pressure is below a certain value, The spool is biased in the anti-gate direction by the coil spring to close the resin flow path between the spool head portion and the ring circular hole, and when the resin pressure exceeds a certain value, the coil spring is biased. The spool is moved in the gate direction by overcoming the force, and an annular resin flow path is formed between the outer circumference of the shaft portion of the spool and the circular hole of the ring, so that the resin flow path is formed. In an open, the resin is extruded while turning in accordance with a spiral by the coil spring,
The ring is formed integrally with a cylindrical body that encloses the coil spring.
【０００９】[0009]
【発明の具体的構成】次に、添付の図面に従って本発明
を更に詳細に説明する。DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in more detail with reference to the accompanying drawings.
【００１０】図１〜図３は、本発明に係るバルブノズル
の１実施例を示すもので、図１は閉の状態、図２は開の
状態である。1 to 3 show an embodiment of a valve nozzle according to the present invention, in which FIG. 1 is in a closed state and FIG. 2 is in an open state.
【００１１】図１において、１０はノズルヘッドであ
り、先端中央部にはゲート１１が用意されている。２０
はスプールであり、先端のヘッド部分２１・中間の軸部
２２・後端に配置されている矢羽状突起２３（図３参
照）で構成されている。ヘッド部分２１及び軸部２２の
少なくともヘッド部分２１の近傍は断面円形に形成され
ている。In FIG. 1, 10 is a nozzle head, and a gate 11 is prepared at the center of the tip. 20
Is a spool, which is composed of a head portion 21 at the front end, a shaft portion 22 at the middle, and a wing-shaped projection 23 (see FIG. 3) arranged at the rear end. At least the vicinity of the head portion 21 of the head portion 21 and the shaft portion 22 is formed in a circular cross section.
【００１２】３０はスプール２０のヘッド部分２１の外
周が当接する円孔を有するリングであり、円筒体３１の
先端に接合されており、その一端はノズルヘッド１０の
内部に形成されている空間の前方段部１２に当接されて
いる。円筒体３１はコイルバネ４０のハウジングともな
っており、このコイルバネ４０は、前方がリング３０
に、後方が矢羽状突起２３に当接し、スプール２０を反
ゲート方向に付勢しており、スプール２０の矢羽状突起
２３の端部は、ノズルヘッド１０の内部に形成されてい
る空間の後方段部１３に当接されている。Reference numeral 30 denotes a ring having a circular hole with which the outer periphery of the head portion 21 of the spool 20 abuts, and is joined to the tip of the cylindrical body 31, one end of which is a space formed inside the nozzle head 10. It is in contact with the front step portion 12. The cylindrical body 31 also serves as a housing for the coil spring 40, and the coil spring 40 has a ring 30 at the front.
In addition, the rear part abuts against the arrow-wing projection 23 and biases the spool 20 in the anti-gate direction, and the end portion of the arrow-wing projection 23 of the spool 20 is a space formed inside the nozzle head 10. Is in contact with the rear step portion 13.
【００１３】上記の状態で、スプール２０のヘッド部分
２１の外周はリング３０の円孔を密閉しており、従って
樹脂の流路は閉となっている。また、この状態は、バネ
の付勢力が樹脂の圧力に打ち勝っている状態である。In the above state, the outer periphery of the head portion 21 of the spool 20 closes the circular hole of the ring 30, so that the resin flow passage is closed. In this state, the urging force of the spring overcomes the pressure of the resin.
【００１４】樹脂の圧力がある一定値以上になると、ス
プール２０に加わる樹脂の圧力成分の内、ゲート方向圧
力と反ゲート方向圧力は、軸部２２の断面積分だけゲー
ト方向圧力の方が大となるので、その圧力差をコイルバ
ネ４０の付勢力より大となるように設定すれば、スプー
ル２０はゲート方向に、矢羽状突起２３の前端が円筒体
３１の端部に接する位置まで移動することとなる。When the resin pressure exceeds a certain value, the gate direction pressure and the anti-gate direction pressure among the pressure components of the resin applied to the spool 20 are larger in the gate direction pressure by the cross-sectional integral of the shaft portion 22. Therefore, if the pressure difference is set to be larger than the biasing force of the coil spring 40, the spool 20 can move in the gate direction to the position where the front end of the arrow-wing projection 23 contacts the end of the cylindrical body 31. Becomes
【００１５】上記の状態が図２に示されている。スプー
ル２０のヘッド部分２１は、ゲート１１近くに用意され
ている凹部１４方向に押し出され、リング３０の円孔の
内径とスプール２０の軸部２２の外形との差で樹脂の流
路が環状に形成されることになる。従って、樹脂は、矢
羽状突起２３の側から流入し、コイルバネ４０によって
形成される螺旋に従って旋回しながら進み、リング３０
の円孔とスプール２０の軸部２２との間に形成された環
状の流路、及び、スプール２０のヘッド部分２１外周と
凹部１４との間に形成される環状の流路を通過して、ゲ
ート１１から射出されることになる。尚、スプレーヘッ
ド部分２１の形状・構成は限定的ではないが、軸部２２
との連結部の成す角度は７０度以下（図面上は６０度と
なっている）が好ましい。The above situation is shown in FIG. The head portion 21 of the spool 20 is extruded in the direction of the recess 14 provided near the gate 11, and the difference between the inner diameter of the circular hole of the ring 30 and the outer shape of the shaft portion 22 of the spool 20 causes the resin flow path to become annular. Will be formed. Therefore, the resin flows in from the side of the arrow-wing-shaped projection 23 and advances while swirling according to the spiral formed by the coil spring 40, and the ring 30
Through an annular flow path formed between the circular hole and the shaft portion 22 of the spool 20, and an annular flow path formed between the outer periphery of the head portion 21 of the spool 20 and the recess 14, It will be ejected from the gate 11. The shape and configuration of the spray head portion 21 is not limited, but the shaft portion 22
The angle formed by the connecting portion with and is preferably 70 degrees or less (60 degrees in the drawing).
【００１６】樹脂の圧力を或る一定値以下に小さくする
とスプール２０は図１に示す状態に復帰し流路は閉とな
る。When the pressure of the resin is reduced below a certain value, the spool 20 returns to the state shown in FIG. 1 and the flow passage is closed.
【００１７】以上説明した本発明に係るバルブノズルは
下記の態様を包含する。The valve nozzle according to the present invention described above includes the following aspects.
【００１８】コイルバネ４０は丸線で形成されることが
好ましいが、螺旋が形成され樹脂を旋回させながら押し
出す機能を阻害しないものであれば、断面方形の板材で
形成されたものやその他の断面形状であってもよい。The coil spring 40 is preferably formed of a round wire, but as long as a spiral is formed so as not to impede the function of pushing out the resin while swirling the resin, one formed of a plate member having a rectangular cross section or other cross-sectional shape May be
【００１９】リング３０がコイルバネ４０を被包する円
筒体３１と別体で形成され互いに接合されていない態
様、又は両者が１つの部材で形成されている態様。A mode in which the ring 30 is formed separately from the cylindrical body 31 enclosing the coil spring 40 and is not joined to each other, or a mode in which both are formed by one member.
【００２０】矢羽状突起２３は、図３に示すように、三
枚バネの構成となっているが、２枚バネや４枚バネ或い
はそれ以上の枚数であっても構わない。然し、これらの
場合には、樹脂を旋回させながら押し出す機能を阻害し
ない構成であることが要求される。As shown in FIG. 3, the wing-shaped projection 23 has a three-leaf spring structure, but may have two or four leaf springs or more. However, in these cases, it is required that the structure does not hinder the function of pushing out the resin while rotating it.
【００２１】ノズルヘッド１０のゲート１１及び凹部１
４の部分は図示の態様に限定されるものではなく、樹脂
流量を増大させる目的で、例えば図４に示すような構成
にすることができる。The gate 11 and the recess 1 of the nozzle head 10
The portion 4 is not limited to the embodiment shown in the figure, but may be configured as shown in FIG. 4 for the purpose of increasing the resin flow rate.
【００２２】[0022]
【発明の効果】本発明に係るバルブノズルによれば、リ
ング３０の円孔とスプール２０の軸部２２との間に形成
される流路、及び、スプール２０のヘッド部分２１の外
周と凹部１４との間に形成される流路が共に環状であ
り、前記した特開昭６１−２９００２１ 号公報に示さ
れている構成のものと異なり流路が偏在ではないので、
特にコイルバネ４０部分での樹脂の流れに分流が生じる
ことがなく、従ってこの部分に樹脂が滞留して所謂焼け
や変色などが生じることが有効に防止される。更に本発
明のバルブノズルによれば、ノズルヘッド１０内の流路
が環状であるため、コイルバネ４０の存在する部分で
は、コイルバネ４０によって形成される螺旋に従って旋
回しながら進むことになり、この樹脂の旋回しながらの
押し出しは、リング３０や凹部１４の流路部分でも阻害
されることなく、ゲート１１を過ぎても継続することに
なる。このため、流路における樹脂は内側と外側とが混
合されながら押し出されることになり、樹脂の焼けや変
色が更に有効に防止されることになる。According to the valve nozzle of the present invention, the flow path formed between the circular hole of the ring 30 and the shaft portion 22 of the spool 20, and the outer periphery of the head portion 21 of the spool 20 and the recess 14 are formed. Since the flow paths formed between and are both annular, the flow paths are not unevenly distributed unlike the configuration shown in the above-mentioned JP-A-61-290021.
In particular, there is no shunt in the resin flow in the coil spring 40 portion, so that it is possible to effectively prevent the resin from staying in this portion and causing so-called burning or discoloration. Further, according to the valve nozzle of the present invention, since the flow path in the nozzle head 10 is annular, the portion where the coil spring 40 is present advances while swirling according to the spiral formed by the coil spring 40. The pushing out while turning is not obstructed by the ring 30 and the flow path portion of the recess 14, and continues even after passing the gate 11. For this reason, the resin in the flow path is extruded while the inner side and the outer side are mixed, and the burn and discoloration of the resin are more effectively prevented.
【図１】本発明の１実施例を示す断面図（閉鎖時）FIG. 1 is a sectional view showing an embodiment of the present invention (when closed).
【図２】本発明の１実施例を示す断面図（射出時）FIG. 2 is a sectional view showing an embodiment of the present invention (at the time of injection)
【図３】スプールの断面図FIG. 3 is a sectional view of the spool.
【図４】本発明の他の実施例を示す断面図FIG. 4 is a sectional view showing another embodiment of the present invention.
１０−ノズルヘッド １１−ゲート １２−前方段部 １３−後方段部 １４−凹部 ２０−スプール ２１−スプールのヘッド部分 ２２−スプールの軸部 ２３−スプールの矢羽状突起 ３０−リング ３１−円筒体 ４０−コイルバネ 10-nozzle head 11-gate 12-front step 13-rear step 14-recess 20-spool 21-spool head 22-spool shaft 23-spool arrowhead 30-ring 31-cylindrical body 40-coil spring
Claims (2)
ッド部分とこのヘッド部分の直径よりも小さな直径を有
する断面円形の軸部と矢羽状突起を有するスプールと、
該スプールのヘッド部分の外周に当接する円孔を有する
リングと、該スプールを反ゲート方向に付勢するコイル
バネとを配置し、樹脂の圧力がある一定値以下である時
には前記スプールが前記コイルバネにより反ゲート方向
に付勢されて前記スプールのヘッド部分と前記リングの
円孔との間の樹脂の流路が閉となり、樹脂の圧力がある
一定値以上になると前記コイルバネの付勢力に打ち勝っ
て前記スプールがゲート方向に移動され、前記スプール
の軸部の外周と前記リングの円孔との間に環状の樹脂流
路が形成されて樹脂の流路が開となり、樹脂が前記コイ
ルバネによる螺旋に従って旋回しながら押し出される構
成であることを特徴とするバルブノズル。1. A head portion having a circular cross section, a shaft portion having a circular cross section having a diameter smaller than the diameter of the head portion, and a spool having a wing-shaped projection in an inner space of the nozzle head.
A ring having a circular hole that comes into contact with the outer circumference of the head portion of the spool and a coil spring that biases the spool in the anti-gate direction are arranged, and when the resin pressure is below a certain value, the spool uses the coil spring. The resin flow path between the head portion of the spool and the circular hole of the ring is closed by being biased in the anti-gate direction, and when the pressure of the resin exceeds a certain value, the biasing force of the coil spring is overcome. The spool is moved in the gate direction, an annular resin flow path is formed between the outer circumference of the spool shaft portion and the circular hole of the ring to open the resin flow path, and the resin turns according to the spiral of the coil spring. A valve nozzle characterized by being pushed out while being.
体に形成されていることを特徴とする請求項１に記載し
たバルブノズル。2. The valve nozzle according to claim 1, wherein the ring is formed integrally with a cylindrical body enclosing the coil spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6331773A JP2850203B2 (en) | 1994-12-09 | 1994-12-09 | Valve nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6331773A JP2850203B2 (en) | 1994-12-09 | 1994-12-09 | Valve nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08156025A true JPH08156025A (en) | 1996-06-18 |
| JP2850203B2 JP2850203B2 (en) | 1999-01-27 |
Family
ID=18247471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6331773A Expired - Fee Related JP2850203B2 (en) | 1994-12-09 | 1994-12-09 | Valve nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2850203B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0891851A1 (en) * | 1997-07-18 | 1999-01-20 | Fisa Corporation | Valve nozzles |
| JP2006130705A (en) * | 2004-11-04 | 2006-05-25 | Fuiisa Kk | Foam injection molding method of liquid silicone rubber |
| US7559762B2 (en) | 2006-06-16 | 2009-07-14 | Mold-Masters (2007) Limited | Open loop pressure control for injection molding |
| US7731489B2 (en) | 2006-12-21 | 2010-06-08 | Mold-Masters (2007) Limited | Valve for co-injection molding apparatus |
| CN104260275A (en) * | 2014-01-17 | 2015-01-07 | 上海积康实业有限公司 | An inner-spring nozzle |
| CN108798531A (en) * | 2018-09-04 | 2018-11-13 | 中石化石油工程技术服务有限公司 | A kind of type variable bit nozzle |
-
1994
- 1994-12-09 JP JP6331773A patent/JP2850203B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0891851A1 (en) * | 1997-07-18 | 1999-01-20 | Fisa Corporation | Valve nozzles |
| US5996618A (en) * | 1997-07-18 | 1999-12-07 | Fisa Corporation | Valve nozzle |
| JP2006130705A (en) * | 2004-11-04 | 2006-05-25 | Fuiisa Kk | Foam injection molding method of liquid silicone rubber |
| JP4526925B2 (en) * | 2004-11-04 | 2010-08-18 | フィーサ株式会社 | Foam injection molding method of liquid silicone rubber |
| US7559762B2 (en) | 2006-06-16 | 2009-07-14 | Mold-Masters (2007) Limited | Open loop pressure control for injection molding |
| US7766647B2 (en) | 2006-06-16 | 2010-08-03 | Mold-Masters (2007) Limited | Open loop pressure control for injection molding |
| US7731489B2 (en) | 2006-12-21 | 2010-06-08 | Mold-Masters (2007) Limited | Valve for co-injection molding apparatus |
| CN104260275A (en) * | 2014-01-17 | 2015-01-07 | 上海积康实业有限公司 | An inner-spring nozzle |
| CN108798531A (en) * | 2018-09-04 | 2018-11-13 | 中石化石油工程技术服务有限公司 | A kind of type variable bit nozzle |
| CN108798531B (en) * | 2018-09-04 | 2024-02-20 | 中石化石油工程技术服务有限公司 | Variable drill bit nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2850203B2 (en) | 1999-01-27 |
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