CN104863523A - 一种井下动力钻具用棘式万向轴 - Google Patents
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Abstract
一种井下动力钻具用棘式万向轴,包括转子接头、传动轴接头、连接轴;其特征是:连接轴与转子接头、传动轴接头之间通过两组传动键连接;连接轴上端设有多个上端键槽,其后侧面为圆弧凹面、底面为平面,相邻两上端键槽之间的凸起的顶面为与连接轴同轴线的圆弧面;转子接头内表面设有与上端键槽配合的齿槽;第一组传动键的每个键块的前侧面为凸出的圆弧面与上端键槽后侧面配合构成弧面接触;键块底面为平面并与上端键槽底面构成平面接触;键块后侧面包括斜平面与转子接头齿槽后侧面配合构成斜面接触;键块的顶部宽度小于底部宽度。第二组传动键与连接轴、传动轴接头之间的设置方式仅仅是方向相反。该万向轴结构简单、寿命长、维修方便。
Description
技术领域
本发明涉及钻具技术领域,具体是一种井下动力钻具用万向轴。
背景技术
螺杆钻具是目前钻井工程中广泛使用的一种井下动力钻具,广泛应用在直井、定向井、水平井、从式井、修井、各种管道的穿越施工等钻井作业。螺杆钻具由旁通阀总成、马达总成、万向轴总成、传动轴总成四大部分组成。
由于马达转子在定子中做行星运动,需要通过万向轴将行星运动转化为传动轴的定轴转动;当螺杆钻具应用于定向井中时,由于造斜的需要,螺杆钻具万向轴外壳有不同角度的弯角,所以万向轴还需要补偿马达和传动轴之间的弯角。同时万向轴还要将马达产生的动力传递到传动轴上,以驱动钻头转动并产生扭矩。
万向轴的运动轨迹类似倒立的圆锥,受的力包括扭矩、轴向力和侧向力。万向轴已成为螺杆钻具中最容易破坏的零件。现在通用的万向轴为花瓣万向轴。花瓣万向轴是将厚壁管沿径向切割成互相啮合的两个分而不断开的花瓣体,封闭的切割线构成一定间隙,间隙的大小取决于弯度范围的大小,由于两个瓣体内腔通过球座及球体来承受压力,同时瓣体结构承受钻具的扭矩。由于其开式结构,在使用过程中瓣缝磨损很快,当间隙增大到一定范围时,在钻具扭矩和拉力的作用下,两瓣体极易脱开,这样必然会造成钻井事故。花瓣万向轴在工作时还受到高压泥浆的冲刷,寿命很短。所以说目前花瓣万向轴已不适应当前钻井的需要。
发明内容
为了克服上述现有技术存在的缺点,本发明的目的在于提供一种井下动力钻具用棘式万向轴,该万向轴结构简单、寿命长、维修方便、能适应各种≤4°角度变化。
为了解决上述问题,本发明采用以下技术方案:一种井下动力钻具用棘式万向轴,包括动力输入的转子接头和输出动力的传动轴接头;转子接头与传动轴接头之间设有连接轴;其特征是:
所述转子接头的下端与连接轴的上端之间通过第一组传动键连接;
所述连接轴的上端绕轴线均布的设有多个上端键槽,上端键槽的后侧面为圆弧凹面,上端键槽的底面为平面,该底面向前延伸与前方的另一个上端键槽的后侧面之间形成凸起;任意两个上端键槽之间形成的凸起的顶面为与连接轴同轴线的圆弧面;
所述转子接头的内表面设有多个齿槽;齿槽的前侧面为斜平面,与上端键槽的底面平行;齿槽的槽顶面为圆弧面,与相邻的两个上端键槽之间的凸起的顶面配合;齿槽的后侧面为一平面;
所述第一组传动键包括多个键块,每个键块的前侧面为凸出的圆弧面,键块的前侧面与所述上端键槽的后侧面相配合构成传递扭矩的弧面接触;键块的底面为平面并与上端键槽的底面构成平面接触;键块的后侧面包括一斜平面,该斜平面与转子接头的齿槽的后侧面配合构成斜面接触;键块的顶部宽度小于底部宽度;
所述连接轴的下端与所述传动轴接头的上端之间通过第二组传动键连接;
所述连接轴的下端绕轴线均布的设有多个下端键槽,下端键槽的设置方向与上端键槽的设置方向相反;下端键槽的前侧面为圆弧面,下端键槽的底面为平面,底面向后延伸与后侧相邻的一个下端键槽的前侧面之间形成凸起;任意两个下端键槽之间形成的凸起的顶面为与连接轴同轴线圆弧面,;
所述传动轴接头的内表面设有多个齿槽,齿槽的后侧面为斜平面,与下端键槽的底面平行,齿槽的槽顶面为圆弧面,与相邻的两个下端键槽之间的凸起的顶面配合,齿槽的前侧面为一平面;
所述第二组传动键包括多个键块,每个键块的后侧面为凸出的圆弧面,键块的后侧面与所述下端键槽的前侧面相配合构成传递扭矩的弧面接触;键块的底面为平面并与下端键槽的底面相配合构成平面接触;键块的前侧面包括一斜平面,该斜平面与传动轴接头的齿槽的前侧面配合构成斜面接触;键块的顶部宽度小于底部宽度。
作为本发明的进一步的技术方案:在该井下动力钻具用棘式万向轴,所述的连接轴上,上端键槽、下端键槽数量相等,两组传动键的键块数量也相等。
进一步的:所述的两组传动键的键块数量均为6块。
进一步的:所述上端键槽的底面与转子接头的齿槽的前侧面之间的垂直距离为1-3mm;所述下端键槽的底面与传动轴接头的齿槽的后侧面之间的垂直距离为1-3mm。
进一步的:所述连接轴的上端面、下端面分别设有一球头,两个球头的球心均位于连接轴的轴线上;在转子接头内设置有凹球面,该凹球面与连接轴上端的球头配合,且该凹球面与连接轴上端的球头同心;在传动轴接头内也设置有凹球面,该凹球面与连接轴下端的球头配合,且该凹球面与连接轴下端的球头同心。
进一步的:还包括密封结构,密封结构设置有两组,第一组密封结构设置在连接轴的上端,用于连接轴上端与转子接头之间的密封连接;第二组密封结构设置在连接轴的下端,用于连接轴下端与传动轴接头之间的密封连接;
每组密封结构均包括有密封套、压块、压紧圈、卡箍;所述密封套为柔性材料制成的筒状;所述压块为筒状,包括筒体和外翻边,所述外翻边位于筒体的一端且外翻边与筒体的外表面之间构成环形卡槽;所述压紧圈也为筒状,压紧圈的一端设置有外螺纹;
第一组密封结构的密封套、压块、压紧圈、卡箍分别记为第一密封套、第一压块、第一压紧圈、第一卡箍;第一压块套置在连接轴上端且位于转子接头内,第一密封套的上端卡入第一压块的环形卡槽内,第一压紧圈的上端螺纹连接在转子接头的下端且第一压紧圈的上端将第一压块的外翻边压紧在转子接头上,第一压块的内径小于位于第一压块上方的部分连接轴的外径;第一压紧圈的上端与第一压块共同压紧固定第一密封套的上端;第一密封套的下端被第一卡箍固定在连接轴上;
第二组密封结构的密封套、压块、压紧圈、卡箍分别记为第二密封套、第二压块、第二压紧圈、第二卡箍;
第二压块套置在连接轴下端且位于传动轴接头内,第二密封套的下端卡入第二压块的环形卡槽内,第二压紧圈的下端螺纹连接在传动轴接头的上端且第二压紧圈的下端将第二压块的外翻边压紧在传动轴接头上,第二压块的内径小于位于第二压块下方的部分连接轴的外径;并且第二压紧圈的下端与第二压块共同压紧固定第二密封套的下端;第二密封套的上端被第二卡箍固定在连接轴上。
进一步的:密封套由耐油橡胶制成。
进一步的:所述的转子接头和传动轴接头上分别开有注油孔。
本发明的有益效果是:
1、传递扭矩大。本发明的传动部件全部是面接触,在转子接头、传动轴接头外径保持不变的前提下,连接轴外径可以做的更大,能够传递大扭矩。
2、工作寿命长。本发明是密封结构,各传动部件在充满润滑脂的环境下工作;各接触面都经过表面硬化处理,在相同的使用工况下磨损小。
附图说明
下面结合附图和实施例对本发明做进一步的说明:
图1为本发明实施例的结构示意图;
图2为图1的A-A剖视示意图;
图3为图1的B-B剖视示意图;
图4为图1中连接轴上端与转子接头之间的连接结构立体示意图(局部剖);
图5为图1中连接轴上端与转子接头之间的连接关系示意图;
图6为图5中连接轴上端的局部立体结构示意图;
图7为图5中连接轴上端的局部立体结构示意图;
图8为图4中第一组传动键的键块的立体结构示意图;
图9为图4中第一组传动键的键块的立体结构示意图;
图10为图4中第一组传动键的键块的主视图;
图11为图10的俯视图;
图12为图10的左视图了;
图13为图10的仰视图;
图14为图10的右视图;
图中:
1转子接头,11齿槽,111前侧面,112槽顶面,113后侧面,114凹球面,115注油孔,
2堵丝,
3第一组传动键,31键块,311前侧面,312底面,313后侧面,
4第一压块,5第一压紧圈,6第一密封套,
7连接轴,71上端键槽,711后侧面,712底面,713顶面,72下端键槽,721前侧面,722底面,723顶面,73上球头,74下球头,
8第二卡箍,
9下球座,
10传动轴接头。101齿槽,1011后侧面,1012槽顶面,1013前侧面,102凹球面,103注油孔,
12第二组传动键,121键块,1211后侧面,1212底面,1213前侧面,
13第二密封套,14第二压块,15第二压紧圈,16第一卡箍,17上球座。
具体实施方式
如图1所示,该井下动力钻具用棘式万向轴,包括动力输入的转子接头1和输出动力的传动轴接头10;两个接头之间设有连接轴7。
所述转子接头1的下端与连接轴7的上端之间通过第一组传动键3连接。
所述连接轴7的上端绕轴线均布的设有多个上端键槽71。上端键槽71的后侧面711为圆弧凹面。上端键槽71的底面712为平面,该底面712向前延伸与前方的另一个上端键槽的后侧面之间形成凸起。任意两个上端键槽之间形成的凸起的顶面713为与连接轴7同轴线的圆弧面,该圆弧面与转子接头1内孔配合,可使连接轴7始终沿其球头球心摆动。
所述转子接头1的内表面设有多个齿槽11;齿槽的前侧面111为斜平面,与上端键槽71的底面712平行;齿槽11的槽顶面112为圆弧面,与相邻的两个上端键槽之间的凸起的顶面713配合;齿槽11的后侧面113为一平面。
如图2、4、5所示,所述第一组传动键3包括多个键块31。如图8-14所示,每个键块31的前侧面311为凸出的圆弧面,键块31的前侧面311与上端键槽71的后侧面711相配合构成传递扭矩的弧面接触。键块31的底面312为平面并与上端键槽71的底面712构成平面接触。键块31的后侧面313包括一斜平面,该斜平面与转子接头的齿槽11的后侧面113配合构成斜面接触。键块31的顶部宽度小于底部宽度。其中的“前”、“后”、“上”、“下”、“顶”、“底”均是为了方便描述而采用的相对位置关系,并不代表绝对位置,不构成对保护范围的限制。
所述连接轴7的下端与传动轴接头10的上端之间通过第二组传动键12连接。
如图3所示,所述连接轴7的下端绕轴线均布的设有多个下端键槽72,下端键槽72的设置方向与上端键槽71的设置方向相反;下端键槽72的前侧面721为圆弧面,下端键槽72的底面722为平面,底面722向后延伸与后侧相邻的一个下端键槽的前侧面之间形成凸起;任意两个下端键槽72之间形成的凸起的顶面723为与连接轴7同轴线的圆弧面。
所述传动轴接头10的内表面设有多个齿槽101,齿槽101的后侧面1011为斜平面,与下端键槽72的底面722平行,齿槽101的槽顶面1012为圆弧面,与相邻的两个下端键槽之间的凸起的顶面723配合,齿槽101的前侧面1013为一平面。
所述第二组传动键12包括多个键块121,每个键块121的后侧面1211为凸出的圆弧面,键块121的后侧面1211与下端键槽72的前侧面721相配合构成传递扭矩的弧面接触。键块121的底面1212为平面并与下端键槽72的底面722相配合构成平面接触。键块121的前侧面1213包括一斜平面,该斜平面与传动轴接头的齿槽101的前侧面1013配合构成斜面接触;键块121的顶部宽度小于底部宽度。
该实施例中,所述的连接轴7上,上端键槽71、下端键槽72数量相等,第一组传动键3、第二组传动键12的键块数量也相等。在该实施例中,所述的两组传动键的键块数量均为6块。
该实施例中,所述上端键槽71的底面712与转子接头1的齿槽11的前侧面111之间的垂直距离为1-3mm;所述下端键槽72的底面722与传动轴接头10的齿槽101的后侧面1011之间的垂直距离为1-3mm。
该实施例中,所述连接轴7的上端面、下端面分别设有一球头,可以分别记为上球头73、下球头74,如图1所示;两个球头的球心均位于连接轴7的轴线上,可以保证连接轴和传动键沿中心摆动,保证啮合的准确性、传动平稳。。在转子接头1内设置有凹球面114,该实施例中,凹球面114设置在上球座17上,上球座17固定在转子接头1上。该凹球面114的球心位于转子接头1的轴线上,该凹球面114与连接轴的上球头73配合;在传动轴接头10内也设置有凹球面102,该实施例中,凹球面102设置在下球座9上,下球座9固定在传动轴接头10上。该凹球面102的球心位于传动轴接头10的轴线上,该凹球面102与连接轴7的下球头74配合。连接轴与球头是一体的,能够提高加工精度,提高转动的精确性。
为了防止钻井液进入花键万向轴内部,该棘式万向轴还包括密封结构,所述密封结构设置有两组,第一组密封结构设置在连接轴7的上端,用于连接轴7上端与转子接头1之间的密封连接;第二组密封结构设置在连接轴7的下端,用于连接轴7下端与传动轴接头10之间的密封连接。
每组密封结构均包括有密封套、压块、压紧圈、卡箍。其中密封套为柔性材料制成的筒状;所述压块为筒状,包括筒体和外翻边,所述外翻边位于筒体的一端且外翻边与筒体的外表面之间构成环形卡槽;所述压紧圈也为筒状,压紧圈的一端设置有外螺纹。
第一组密封结构的密封套、压块、压紧圈、卡箍分别记为第一密封套6、第一压块4、第一压紧圈5、第一卡箍16。
第一压块4套置在连接轴上端且位于转子接头1内,第一密封套6的上端卡入第一压块4的环形卡槽内,第一压紧圈5的上端螺纹连接在转子接头1的下端且第一压紧圈5的上端将第一压块4的外翻边压紧在转子接头1上,第一压块4的内径小于位于第一压块上方的部分连接轴7的外径,可以限制连接轴7的轴向位移。第一压紧圈5的上端与第一压块4共同压紧固定第一密封套6的上端;第一密封套6的下端被第一卡箍16固定在连接轴7上。
第二组密封结构的密封套、压块、压紧圈、卡箍分别记为第二密封套13、第二压块14、第二压紧圈15、第二卡箍8。
第二压块14套置在连接轴7下端且位于传动轴接头10内,第二密封套13的下端卡入第二压块14的环形卡槽内,第二压紧圈15的下端螺纹连接在传动轴接头10的上端且第二压紧圈15的下端将第二压块14的外翻边压紧在传动轴接头10上,第二压块14的内径小于位于第二压块下方的部分连接轴7的外径,可以限制连接轴的轴向位移;并且第二压紧圈15的下端与第二压块14共同压紧固定第二密封套13的下端;第二密封套13的上端被第二卡箍8固定在连接轴7上。
在该实施例中,第一密封套6、第二密封套13均由耐油橡胶制成。
该实施例中,所述的转子接头1上设置有注油孔115,传动轴接头10上也开有注油孔103。当钻具组装完毕后从注油孔103、115内注入润滑脂,保证传动键与转子接头的齿槽、传动轴接头的齿槽之间;球头与球座之间始终工作在润滑环境中。
注油孔115、103上均设置有堵丝2。
工作时,马达产生的动力通过马达转子传递到转子接头1上,转子接头1通过第一组传动键3将动力传递给连接轴7,连接轴7再通过第二组传动键12传递给传动轴接头10。转子接头1、传动轴接头10与各自配合的键块之间是斜面接触,连接轴7与键块之间是平面和等半径的弧面接触。
在工作时第一组传动键、第二组传动键沿弧面接触处转动,不但可以补偿螺杆钻具转子的偏心运动和万向轴的弯角,还能保证转子接头(传动轴接头)与传动键、连接轴与传动键之间始终保持面接触,这就极大的提高万向轴所能承受的扭矩、大幅度的延长其使用寿命。
除上述技术外,该实施例中的转子接头、传动轴接头、球座、球头采用渗碳或渗氮处理后,不但更耐磨,还可以传递更大扭矩。
以上对本发明的一个实施例进行了详细说明,但所述内容仅为本发明的较佳实施例,不能被认为用于限定本发明的实施范围。凡依发明申请范围所做的均等变化与改进等,均应归属于本发明的涵盖的保护范围之内。
Claims (8)
1.一种井下动力钻具用棘式万向轴,包括动力输入的转子接头和输出动力的传动轴接头;转子接头与传动轴接头之间设有连接轴;其特征是:
所述转子接头的下端与连接轴的上端之间通过第一组传动键连接;
所述连接轴的上端绕轴线均布的设有多个上端键槽,上端键槽的后侧面为圆弧凹面,上端键槽的底面为平面,该底面向前延伸与前方的另一个上端键槽的后侧面之间形成凸起;任意两个上端键槽之间形成的凸起的顶面为与连接轴同轴线的圆弧面;
所述转子接头的内表面设有多个齿槽;齿槽的前侧面为斜平面,与上端键槽的底面平行;齿槽的槽顶面为圆弧面,与相邻的两个上端键槽之间的凸起的顶面配合;齿槽的后侧面为一平面;
所述第一组传动键包括多个键块,每个键块的前侧面为凸出的圆弧面,键块的前侧面与所述上端键槽的后侧面相配合构成传递扭矩的弧面接触;键块的底面为平面并与上端键槽的底面构成平面接触;键块的后侧面包括一斜平面,该斜平面与转子接头的齿槽的后侧面配合构成斜面接触;键块的顶部宽度小于底部宽度;
所述连接轴的下端与所述传动轴接头的上端之间通过第二组传动键连接;
所述连接轴的下端绕轴线均布的设有多个下端键槽,下端键槽的设置方向与上端键槽的设置方向相反;下端键槽的前侧面为圆弧面,下端键槽的底面为平面,底面向后延伸与后侧相邻的一个下端键槽的前侧面之间形成凸起;任意两个下端键槽之间形成的凸起的顶面为与连接轴同轴线圆弧面,;
所述传动轴接头的内表面设有多个齿槽,齿槽的后侧面为斜平面,与下端键槽的底面平行,齿槽的槽顶面为圆弧面,与相邻的两个下端键槽之间的凸起的顶面配合,齿槽的前侧面为一平面;
所述第二组传动键包括多个键块,每个键块的后侧面为凸出的圆弧面,键块的后侧面与所述下端键槽的前侧面相配合构成传递扭矩的弧面接触;键块的底面为平面并与下端键槽的底面相配合构成平面接触;键块的前侧面包括一斜平面,该斜平面与传动轴接头的齿槽的前侧面配合构成斜面接触;键块的顶部宽度小于底部宽度。
2.根据权利要求1所述的一种井下动力钻具用棘式万向轴,其特征是:所述的连接轴上,上端键槽、下端键槽数量相等,两组传动键的键块数量也相等。
3.根据权利要求1所述的一种井下动力钻具用棘式万向轴,其特征是:所述的两组传动键的键块数量均为6块。
4.根据权利要求1所述的一种井下动力钻具用棘式万向轴,其特征是:所述上端键槽的底面与转子接头的齿槽的前侧面之间的垂直距离为1-3mm;所述下端键槽的底面与传动轴接头的齿槽的后侧面之间的垂直距离为1-3mm。
5.根据权利要求1-4任一所述的一种井下动力钻具用棘式万向轴,其特征是:所述连接轴的上端面、下端面分别设有一球头,两个球头的球心均位于连接轴的轴线上;在转子接头内设置有凹球面,该凹球面与连接轴上端的球头配合,且该凹球面与连接轴上端的球头同心;在传动轴接头内也设置有凹球面,该凹球面与连接轴下端的球头配合,且该凹球面与连接轴下端的球头同心。
6.根据权利要求5所述的一种井下动力钻具用棘式万向轴,其特征是:还包括密封结构,密封结构设置有两组,第一组密封结构设置在连接轴的上端,用于连接轴上端与转子接头之间的密封连接;第二组密封结构设置在连接轴的下端,用于连接轴下端与传动轴接头之间的密封连接;
每组密封结构均包括有密封套、压块、压紧圈、卡箍;所述密封套为柔性材料制成的筒状;所述压块为筒状,包括筒体和外翻边,所述外翻边位于筒体的一端且外翻边与筒体的外表面之间构成环形卡槽;所述压紧圈也为筒状,压紧圈的一端设置有外螺纹;
第一组密封结构的密封套、压块、压紧圈、卡箍分别记为第一密封套、第一压块、第一压紧圈、第一卡箍;第一压块套置在连接轴上端且位于转子接头内,第一密封套的上端卡入第一压块的环形卡槽内,第一压紧圈的上端螺纹连接在转子接头的下端且第一压紧圈的上端将第一压块的外翻边压紧在转子接头上,第一压块的内径小于位于第一压块上方的部分连接轴的外径;第一压紧圈的上端与第一压块共同压紧固定第一密封套的上端;第一密封套的下端被第一卡箍固定在连接轴上;
第二组密封结构的密封套、压块、压紧圈、卡箍分别记为第二密封套、第二压块、第二压紧圈、第二卡箍;
第二压块套置在连接轴下端且位于传动轴接头内,第二密封套的下端卡入第二压块的环形卡槽内,第二压紧圈的下端螺纹连接在传动轴接头的上端且第二压紧圈的下端将第二压块的外翻边压紧在传动轴接头上,第二压块的内径小于位于第二压块下方的部分连接轴的外径;并且第二压紧圈的下端与第二压块共同压紧固定第二密封套的下端;第二密封套的上端被第二卡箍固定在连接轴上。
7.根据权利要求6所述的一种井下动力钻具用棘式万向轴,其特征是:密封套由耐油橡胶制成。
8.根据权利要求6或7所述的一种井下动力钻具用棘式万向轴,其特征是:所述的转子接头和传动轴接头上分别开有注油孔。
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Address after: Jinghua Road, Dezhou Economic Development Zone, Shandong province 253000 Patentee after: Dezhou United Petroleum Polytron Technologies Inc Address before: 253034 Shandong city of Dezhou Province Economic and Technological Development Zone South Road crystal Patentee before: Dezhou United Petroleum Machinery Co., Ltd. |