WO2017219864A1 - 差力旋转式喷头 - Google Patents

差力旋转式喷头 Download PDF

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Publication number
WO2017219864A1
WO2017219864A1 PCT/CN2017/087422 CN2017087422W WO2017219864A1 WO 2017219864 A1 WO2017219864 A1 WO 2017219864A1 CN 2017087422 W CN2017087422 W CN 2017087422W WO 2017219864 A1 WO2017219864 A1 WO 2017219864A1
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Prior art keywords
bearing shell
oil seal
arm
sealing cap
nozzle
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PCT/CN2017/087422
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English (en)
French (fr)
Inventor
李春林
Original Assignee
李春林
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Publication date
Priority claimed from CN201620635005.6U external-priority patent/CN205761890U/zh
Priority claimed from CN201610467399.3A external-priority patent/CN107537703B/zh
Application filed by 李春林 filed Critical 李春林
Publication of WO2017219864A1 publication Critical patent/WO2017219864A1/zh
Priority to US16/231,888 priority Critical patent/US10799890B2/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
    • B05B3/06—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet by jet reaction, i.e. creating a spinning torque due to a tangential component of the jet

Definitions

  • the invention relates to a sprinkler device, in particular to a differential rotary sprinkler, which can be used for irrigation, such as farmland, garden, landscape, fruits and vegetables, flowers and the like.
  • the first type is a rocker arm rotary nozzle designed by mechanical principle (referred to as a rocker arm nozzle), and the second type is a jet rotation type designed by fluid mechanics.
  • the nozzle (referred to as the jet nozzle), when the nozzles of the above two structures are used, it is found that there is uneven spraying, the spray frame is unstable, extremely easy to tip over, the rotation unevenness is not stable, and large-scale and large-area irrigation cannot be realized.
  • 201410076494.1 reflective rotary nozzle
  • the disassembly and assembly method in the existing structure is to screw down the sealing screw plug, and the disassembly is relatively easy, but Installation is very inconvenient; 4, the spray water of the nozzle in the existing structure is not even enough, and the water is often lacking in the middle zone when spraying.
  • the object of the present invention is to provide a differential rotary nozzle which is simple and reasonable in structure, does not need to change lubricating oil frequently, has good sealing effect, can achieve uniform low-speed rotation, uniform water spray, water saving, and convenient installation and disassembly.
  • the nozzle comprises a V-shaped arm 1, a nozzle 2, a dustproof sealing cap 3, an upper oil seal 4, an upper bearing shell 5, a bearing shell 6, a lower bearing shell 7, a lower oil seal 8, and a limit nut.
  • the nozzles are symmetrically disposed at the two top ends of the V-shaped rotating arm, and the dustproof sealing cap 3 is fixedly attached to the arm body 11 of the V-shaped rotating arm 1, on the arm body 11
  • There is a limit annular step 12 hidden in the dustproof sealing cap 3 the upper oil seal 4 is disposed at the lower end of the inner wall of the dustproof sealing cap 3, and the upper bearing shell 5 is mounted on the bearing shell 6
  • the upper end of the lower bearing bush 7 and the lower oil seal 8 are disposed in the middle position of the bearing shell 6 from top to bottom, and the upper bearing shell 5, the bearing shell 6, the lower bearing shell 7 and the lower oil seal 8 are assembled to form a bearing shell body,
  • the main body of the bearing shell 6 is sleeved on the arm body 11 of the V-shaped arm 1.
  • the upper bearing shell 5 is engaged with the limiting annular step 12, and the limiting nut 9 with the sealing O-ring 10 is placed on the arm body. 11
  • the upper surface of the upper bearing shell body is screwed to the lower side of the arm body 11.
  • the position limiting nut 9 and the lower bearing shell 7 are left between 0.5 and 1.5 mm.
  • the axial gap, the outer arm of the limit nut 9 is a smooth surface that seals with the lower oil seal 8.
  • the nozzle 2 is provided with an orthographic hole 13 and a reflection hole 14 having a diameter smaller than the diameter of the reflection hole 14.
  • the angle ⁇ between the orth hole 13 and the reflection hole 14 is 90. ⁇ 120°.
  • an oil seal is arranged in the dustproof sealing cap, and when the bearing shell main body is assembled, a dustproof sealing cap, a rotating arm body and an upper oil seal are formed.
  • An oil storage cavity, the upper bearing bush, the bearing shell, the lower bearing bush and the arm body form a second oil storage cavity, and the gap between the upper bearing bush, the lower bearing bush and the rotating arm body communicates with the oil storage cavity, thereby realizing
  • the continuous supply of lubricating oil has the advantages of good sealing effect, uniform rotation and long service life.
  • the angle between the reflection hole and the orthoscopic hole on the nozzle is set to 90 to 120°, the angle is more reasonable, and the hole of the higher hole is ejected regardless of which hole of the orthographic hole and the reflection hole is raised. Relatively close, the lower hole spray distance is relatively far, so that the uniformity of the spray can be maintained, so the water spray is more uniform and there is no dead angle.
  • Figure 2 is an exploded perspective view of Figure 1 of the present invention.
  • Figure 3 is an assembled view of the components of Figure 2 of the present invention.
  • Figure 4 is a cross-sectional view showing the structure of the nozzle of the present invention.
  • Figure 5 is a cross-sectional view taken along line A-A of Figure 4 of the present invention.
  • the nozzle includes a V-shaped arm 1, a nozzle 2, a dustproof sealing cap 3, an upper oil seal 4, an upper bearing shell 5, a bearing shell 6, a lower bearing shell 7, a lower oil seal 8, and a limit nut. 9 and sealing the O-shaped rubber ring 10; the nozzles are symmetrically disposed at the two top ends of the V-shaped rotating arm, and the dustproof sealing cap 3 is fixedly attached to the arm body 11 of the V-shaped rotating arm 1, on the arm body 11 There is a limit annular step 12 hidden in the dustproof sealing cap 3, the upper oil seal 4 is disposed at the lower end of the inner wall of the dustproof sealing cap 3, and the upper bearing shell 5 is mounted on the bearing shell 6 The upper end of the lower bearing bush 7 and the lower oil seal 8 are disposed in the middle position of the bearing shell 6 from top to bottom, and the upper bearing shell 5, the bearing shell 6, the lower bearing shell 7 and the lower oil seal 8 are assembled to form a bearing shell body, The main body of the bearing shell 6 is sleeve
  • the upper bearing shell 5 is engaged with the limiting annular step 12, and the limiting nut 9 with the sealing O-ring 10 is placed on the arm body. 11
  • the upper part of the upper bearing shell body is screwed to the lower side of the arm body 11.
  • an axial gap of 0.5 to 1.5 mm is left between the limiting nut 9 and the lower bearing bush 7 Said stop nut smooth outer arm 9 and the lower surface of the sealing seal 8.
  • the inner wall of the dustproof sealing cap 3 has two steps.
  • the upper step 3-1 is a locking platform of the upper oil seal 4, and the lower step 3-2 is a sealing table of the dustproof sealing cap 3 and the bearing shell 6.
  • the nozzle 2 is provided with an orthographic hole 13 and a reflection hole 14 having a diameter smaller than the diameter of the reflection hole 14.
  • the angle ⁇ between the orth hole 13 and the reflection hole 14 is 90. ⁇ 120°.
  • the dustproof sealing cap 3, the upper oil seal 4 and the arm body 11 enclose a first oil storage cavity 15; the upper bearing shell 5, the bearing shell 6, the lower bearing shell 7 and the arm body 11 enclose a second oil storage cavity 16.
  • the upper bearing pad 5 and the lower bearing pad 7 and the arm body 11 have a clearance of at least 0.15 mm in the radial direction to facilitate rotary lubrication.
  • the water inlet pipe is connected to the internal thread under the bearing shell. Since the two nozzles 2 disposed at the top end of the V-shaped arm 1 are opposite in direction of the orthographic hole 13 and the reflection hole 14, when the water pump pressurizes the water When the pipe is sent to the nozzle, the water flow will be ejected from the orthographic hole 13 and the reflection hole 14 in the nozzle 2.
  • the water ejected from the orthorquine 13 falls on the vicinity of the nozzle, and the water ejected from the reflection hole 14 covers the distal end range.
  • the function of the reflection hole 14 is not only to spray the water to a distant place, but also to function to rotate the nozzle to generate power.
  • the driving force for driving the nozzle is F
  • the frictional resistance is F 1
  • the positive perforating thrust is F 2
  • the reflecting hole thrust is F 3
  • F 1 is constant
  • F 2 and F 3 are adjustable, and the nozzle is manufactured (factory) when the ortho and the reflection holes are at the horizontal 30° elevation angle, and F 3 is greater than F 1 plus F 2 .
  • the nozzle is in a state of constant rotation.
  • the angle of the reflection hole can be adjusted downward so that the horizontal elevation angle is lower than 30°, and the horizontal elevation angle of the ortho hole is greater than 30°.
  • the thrust generated by the reverse thrust of the air on the rotation of the nozzle is such that the smaller the angle is, the larger the thrust is. Otherwise, the larger the angle is, the smaller the thrust is. Therefore, when the reflection hole is adjusted to a horizontal inclination of 0°, the orthoscopic hole reaches the maximum angle level. elevation is 60 °, the maximum time F 3, F 2 forward thrust minimum, the fastest rotating nozzle, F maximum value. Conversely, when low speed rotation is required, the orthoscopic hole is adjusted downward.
  • the water pump sends a certain pressure of water into the upper water pipe and is emitted from the nozzle 2, and the reverse thrust generated by the water sprayed from the reflection hole 14 is greater than the positive thrust generated by the water sprayed from the orthonormal hole 13 at this time.
  • the nozzle rotates and the water pressure rapidly reaches a peak.
  • the gap between the upper bearing shell 5 and the limiting annular step 12 is opened, and since the position of the oil storage cavity is at a high position, The grease automatically fills the gap, and the gap between the lower bearing bush 7 and the limit nut 9 is closed; when the water pouring operation is stopped, the force generated by the self-weight causes the upper bearing pad 5 to close due to the water pressure being eliminated, and the lower bearing bush 7 is closed.
  • the gap between the limit nut 9 and the limit nut 9 is opened, and the grease automatically fills the gap between the lower bearing bush 7 and the limit nut 9 so that the reciprocating movement can be performed without disassembling the nozzle, and the ratio can be guaranteed.
  • the design of the application is more even and reliable.

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Abstract

一种差力旋转式喷头，该喷头包括V形转臂（1）、喷嘴（2）、防尘密封帽（3）、上油封（4）、上轴瓦（5）、轴承壳（6）、下轴瓦（7）、下油封（8）、限位螺母（9）和密封O形胶圈（10）；所述防尘密封帽（3）固连在V形转臂（1）的臂体（11）上，所述臂体（11）上带有一个限位环形台阶（12），所述限位环形台阶（12）隐藏在防尘密封帽（3）内，上油封（4）设置在防尘密封帽（3）的内壁下端，所述上轴瓦（5）镶装在轴承壳（6）的上端，下轴瓦（7）和下油封（8）组装后构成轴承壳主体（A），所述上轴瓦（5）与限位环形台阶（12）卡接定位，所述限位螺母（9）旋紧后限位螺母（9）与下轴瓦（7）之间留有0.5～1.5mm的轴向间隙，所述限位螺母（9）的外臂是与下油封（8）实现密封的光滑表面。该喷头结构简单合理，带有双储油空腔润滑结构，无需经常更换润滑油，密封效果好，能够实现均匀低速旋转、喷水均匀、节省水资源、安装和拆卸方便。

Description

差力旋转式喷头 技术领域
本发明涉及一种喷灌装置，具体的说是一种差力旋转式喷头，该喷头可用于农田、园林、景观、水果蔬菜、花卉等一切需要灌溉。
背景技术
目前，市场上使用的旋转式喷头有两大类，第一类是以机械学原理设计的摇臂旋转式喷头(简称摇臂式喷头)，第二类是以流体力学原理设计的射流旋转式喷头(简称射流式喷头)，上述两种结构的喷头在使用时人们发现存在着喷洒不匀、喷架不稳、极易倾覆、旋转不匀速不平稳、无法实现大规模和大面积的灌溉、密封效果差、使用寿命短等缺点，为了克服上述缺点和不足，申请人提出了一个在先申请，申请号：201410076494.1(反射旋转式喷头)，该反射旋转式喷头尽管在一定程度上克服了上述的缺点和不足，但在使用时申请人还是发现存在一定的缺陷，具体表现在：①、防尘帽与轴管之间采用螺纹式的连接方式，套装在轴承壳上，由于螺纹连接的方式密封不严，使用时经常导致容易渗水，水渗入轴承壳内后会使得润滑油变质，需要经常换油，从而带来很多的麻烦；②、轴管和轴瓦之间摩擦是硬性摩擦，旋转不够均匀，旋转过程中实现不了低速旋转；③、现有结构中拆装方式是将密封螺塞拧下来实现，拆卸相对容易，但安装很不方便；④、现有结构中喷嘴的喷水还不够均匀，喷洒时经常是中间地带缺水。
名称为“差力旋转式喷头”专利申请号为201610467399.3的在先申请基本解决了上述现有技术存在的问题，但是在实际运行过程中申请人发现还是存在以下不足之处，具体表现在：①、密封盖和限位螺母之间旋转摩擦过程中经过长时间工作会出现缺油现象，导致旋转停止，需将差力旋转式喷头停止工作，向密封盖补充润滑油，费事费力，影响灌溉周期；
②、防尘帽内壁设置的第一密封胶圈与臂体下面的臂体之间长时间工作容易造成第一密封胶圈的磨损，需经常更换第一密封胶圈，操作繁琐，费事费力，影响灌溉进度；③、限位螺母设置在臂体的中间位置，拆卸时需要将密封盖旋下，安装和拆卸不方便；④、由于工作状态间隙打开时没有润滑油补充，导致润滑效果不好，这样使得差力旋转式喷头的转速过快，无法达到低于每5分钟转一周的转速，不能保证喷洒的射程和面积。
发明内容
本发明的目的是要提供一种差力旋转式喷头，该喷头结构简单合理，无需经常更换润滑油，密封效果好，能够实现均匀低速旋转、喷水均匀、节省水资源、安装和拆卸方便。
本发明的目的是这样实现的，该喷头包括V形转臂1、喷嘴2、防尘密封帽3、上油封4、上轴瓦5、轴承壳6、下轴瓦7、下油封8、限位螺母9和密封O形胶圈10；所述的喷嘴对称设置在V形转臂的两个顶端，防尘密封帽3固连在V形转臂1的臂体11上，所述臂体11上带有一个限位环形台阶12，所述限位环形台阶12隐藏在防尘密封帽3内，上油封4设置在防尘密封帽3的内壁下端，所述上轴瓦5镶装在轴承壳6的上端，下轴瓦7和下油封8由上至下依次设置在轴承壳6内中间位置，所述上轴瓦5、轴承壳6、下轴瓦7和下油封8组装后构成轴承壳主体，所述轴承壳6主体套装在V形转臂1的臂体11上，其中上轴瓦5与限位环形台阶12卡接定位，其内带有密封O形胶圈10的限位螺母9套装在臂体11上轴承壳主体的下面与臂体11下面螺纹连接，所述限位螺母9旋紧后限位螺母9与下轴瓦7之间留有0.5～1.5mm的轴向间隙，所述限位螺母9的外臂是与下油封8实现密封的光滑表面。
所述喷嘴2上设置有一个正射孔13和一个反射孔14，所述正射孔13的直径小于反射孔14的直径，所述正射孔13和反射孔14之间的角度α是90～120°。
本发明具有以下优点和积极效果：
1、本发明由于将防尘密封帽与转臂焊接后连成一体，防尘密封帽内设置上油封，当轴承壳主体套装后防尘密封帽、转臂臂体及上油封之间形成第一储油空腔，上轴瓦、轴承壳、下轴瓦和臂体形成第二储油空腔，上轴瓦、下轴瓦与转臂臂体之间带有和储油空腔连通的间隙，实现了润滑油的连续供给，具有密封效果好、旋转均匀、使用寿命延长等优点。
2、本发明由于将喷嘴上的反射孔和正射孔之间的角度设置为90～120°，角度更加的合理，无论正射孔和反射孔哪一个孔抬高，较高的孔的喷射距离相对较近，较低的孔喷射距离相对较远，这样就能够保持喷洒的均匀度，所以水的喷洒更加的均匀，没有死角。
3、由于工作状态时上轴瓦与限位环形台阶之间的间隙打开，储油空腔的位置处于高处，润滑脂自动充满间隙补充润滑油，润滑效果好，这样使得差力旋转式喷头的转速可以达到低于低于每5分钟转一周的转速，最佳效果可以达到每20分钟转一周的转速，保证了喷洒的射程和面积。
附图说明
图1是本发明整体结构示意图。
图2是本发明图1的部件分解图。
图3是本发明图2中各部件的组装图。
图4是本发明喷嘴结构剖示图。
图5是本发明图4中A-A剖示图。
上述附图中的附图标记：1、V形转臂，2、喷嘴，3、防尘密封帽，4、上油封，5、上轴瓦，6、轴承壳，7、下轴瓦，8、下油封，9、限位螺母，10、密封O形胶圈，11、臂体，12、限位环形台阶，13正射孔，14、反射孔，15、第一储油空腔，16、 第二储油空腔16。
具体实施方式
由附图1、2所示：该喷头包括V形转臂1、喷嘴2、防尘密封帽3、上油封4、上轴瓦5、轴承壳6、下轴瓦7、下油封8、限位螺母9和密封O形胶圈10；所述的喷嘴对称设置在V形转臂的两个顶端，防尘密封帽3固连在V形转臂1的臂体11上，所述臂体11上带有一个限位环形台阶12，所述限位环形台阶12隐藏在防尘密封帽3内，上油封4设置在防尘密封帽3的内壁下端，所述上轴瓦5镶装在轴承壳6的上端，下轴瓦7和下油封8由上至下依次设置在轴承壳6内中间位置，所述上轴瓦5、轴承壳6、下轴瓦7和下油封8组装后构成轴承壳主体，所述轴承壳6主体套装在V形转臂1的臂体11上，其中上轴瓦5与限位环形台阶12卡接定位，其内带有密封O形胶圈10的限位螺母9套装在臂体11上轴承壳主体的下面与臂体11下面螺纹连接，所述限位螺母9旋紧后限位螺母9与下轴瓦7之间留有0.5～1.5mm的轴向间隙，所述限位螺母9的外臂是与下油封8实现密封的光滑表面。
所述防尘密封帽3内壁带有两个台阶，上台阶3-1是上油封4的卡接台，下台阶3-2是防尘密封帽3与轴承壳6的密封台。
所述喷嘴2上设置有一个正射孔13和一个反射孔14，所述正射孔13的直径小于反射孔14的直径，所述正射孔13和反射孔14之间的角度α是90～120°。
所述防尘密封帽3、上油封4和臂体11围成第一储油空腔15；上轴瓦5、轴承壳6、下轴瓦7和臂体11围成第二储油空腔16。
所述上轴瓦5和下轴瓦7与臂体11之间的径向带有至少0.15mm间隙，便于旋转润滑。
工作过程：
使用时，将进水管道与轴承壳下面的内螺纹连接，由于V形转臂1顶端设置的两个喷嘴2上正射孔13和反射孔14的方向相反，所以当水泵把水加压通过管道送到喷头时，水流将从喷嘴2上的正射孔13和反射孔14喷射，正射孔13喷射出的水洒落在喷头的近处范围，反射孔14喷射出的水覆盖远端范围，反射孔14的作用不仅是把水向远处喷射，还起到了一个给喷头旋转产生动力的作用。
工作原理：
若设推动喷头旋转的动力为F，摩擦阻力为F1，正射孔推力为F2，反射孔推力为F3，则推动喷头旋转的力F＝F3-F1-F2。由于F1是不变的，F2和F3是可调整变化的，喷头在制造(出厂)时是按正射孔和反射孔同时处于水平30°仰角时，F3大于F1加F2，喷头工作时喷头处于中匀速旋转的状态，当需要加快旋转速度时，可以把反射孔的角度向下调整，使其水平仰角低于30°，同时正射孔的水平仰角就大于30°了，由于空气反推力对喷头旋转产生的推力是角度越小则推力越大，反之则是角度越大推力越小，所以反射孔调整至水平倾角为0°时，正射孔即达到最大角度水平仰角为60°，这时F3最大，正推力F2最小，喷头旋转最快，F值最大。反之，当需要低速旋转时，则把正射孔向下调整，当正射孔调整至水平仰角为0°时，则反射孔的水平仰角为60°，这时 F3-F1-F2的差最小，推动喷头旋转的力F最小，则喷头处于最低速旋转的状态。
当喷头不工作处于静止状态时，此时轴承壳6内的空间和防尘密封帽3内的储油空腔全部存满润滑脂，此时由于重力的作用，上轴瓦5的上端面承重，处于严密接触，下轴瓦7与限位螺母9间隙张开，润滑脂自动流入下轴瓦7与限位螺母9之间留有的0.5～1.5mm轴向间隙内。
开始工作时，水泵把一定压力的水送入上水管，并从喷嘴2射出，由于反射孔14喷出的水所产生的反推力大于正射孔13喷出的水产生的正推力，此时喷头发生反射旋转，同时水压迅速达到峰值，由于高压水对喷头有一个向上的推力，使上轴瓦5与限位环形台阶12之间的间隙打开，由于储油空腔的位置处于高处，润滑脂自动充满所述间隙，此时下轴瓦7与限位螺母9之间的间隙封闭；当水浇完工作停止时，由于水压消除，自重产生的力使上轴瓦5间隙关闭，下轴瓦7与限位螺母9之间的间隙张开，润滑脂又自动充满下轴瓦7与限位螺母9之间的间隙，如此往复，可实现无需拆解喷头加油保养的麻烦，并可以保证比在先申请的设计更加均匀可靠的旋转。

Claims (5)

  1. 一种差力旋转式喷头，其特征在于：该喷头包括V形转臂1、喷嘴2、防尘密封帽3、上油封4、上轴瓦5、轴承壳6、下轴瓦7、下油封8、限位螺母9和密封O形胶圈10；所述的喷嘴对称设置在V形转臂的两个顶端，防尘密封帽3固连在V形转臂1的臂体11上，所述臂体11上带有一个限位环形台阶12，所述限位环形台阶12隐藏在防尘密封帽3内，上油封4设置在防尘密封帽3的内壁下端，所述上轴瓦5镶装在轴承壳6的上端，下轴瓦7和下油封8由上至下依次设置在轴承壳6内中间位置，所述上轴瓦5、轴承壳6、下轴瓦7和下油封8组装后构成轴承壳主体A，所述轴承壳主体A套装在V形转臂1的臂体11上，其中上轴瓦5与限位环形台阶12卡接定位，其内带有密封O形胶圈10的限位螺母9套装在臂体11上轴承壳主体A的下面与臂体11下面螺纹连接，所述限位螺母9旋紧后限位螺母9与下轴瓦7之间留有0.5～1.5mm的轴向间隙，所述限位螺母9的外臂是与下油封8实现密封的光滑表面。
  2. 根据权利要求1所述的一种差力旋转式喷头，其特征在于：所述喷嘴2上设置有一个正射孔13和一个反射孔14，所述正射孔13的直径小于反射孔14的直径，所述正射孔13和反射孔14之间的角度α是90～120°。
  3. 根据权利要求1所述的一种差力旋转式喷头，其特征在于：所述防尘密封帽3、上油封4和臂体11围成第一储油空腔15；上轴瓦5、轴承壳6、下轴瓦7和臂体11围成第二储油空腔16。
  4. 根据权利要求1所述的一种差力旋转式喷头，其特征在于：所述上轴瓦5和下轴瓦7与臂体11之间的径向带有至少0.15mm间隙，便于旋转润滑。
  5. 根据权利要求1所述的一种差力旋转式喷头，其特征在于：所述防尘密封帽3内壁带有两个台阶，上台阶3-1是上油封4的卡接台，下台阶3-2是防尘密封帽3与轴承壳6的密封台。
PCT/CN2017/087422 2016-06-24 2017-06-07 差力旋转式喷头 WO2017219864A1 (zh)

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