CN101920552B - 一种螺杆挤出机机筒及其温度控制方法 - Google Patents
一种螺杆挤出机机筒及其温度控制方法 Download PDFInfo
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Abstract
本发明提出一种螺杆挤出机机筒及其温度控制方法,该机筒具有双层布置的双通道控温结构,在机筒横截面的两个不同的径向层面上,分两层开设有多条导热介质流道,流道内可通入加热介质或冷却介质,外层流道沿机筒周向开设,内层流道沿机筒轴向开设,每层的各流道之间采用并联形式。内外安装两个的温度传感器,分别测量机筒内表面附近温度和机筒外层温度,通过逻辑控制程序控制机筒温度,可以减小机筒内外及冷热交替的局部温差,使整个机筒温度控制均匀,而且局部不产生过大应力,有效地增加导热介质与机筒之间的接触传热面积,提高热交换效率,改善机筒温度控制***的敏感性、降低能量损耗。本发明特别适合于大中型双螺杆挤压造粒机使用。
Description
技术领域:
本发明涉及一种螺杆挤出机机筒,具体涉及具有控温通道结构的机筒,特别是对机筒的加热/冷却通道结构的改进及机筒温度控制的方法。适用于大型螺杆挤出造粒机组。
背景技术:
目前螺杆挤出机机筒普遍采用的加热/冷却方式主要有:1、外置电加热器加热+水冷却方式,该方式机筒开设冷却通道,采用水作为冷却介质,由于水汽化的影响,温控范围和温控精度都受到限制。2、外置电加热器加热+蒸汽冷却方式,该方式采用高压蒸汽作为冷却介质,克服了水汽化的问题,但是必须配套高压蒸汽供给站。3、外置电加热器加热+导热油冷却方式,与第1和第2种方式相比,该方式不仅具有较高的温控范围和温控精度,而且适用性强,是中小型挤出机使用最多的加热冷却形式,在大型挤出造粒机组中也有使用。但是,由于采用外置电加热方式,挤出机筒内外温差较大,特别是对于大型挤出机筒,容易造成机筒温度分布不均匀,从而导致机筒变形,影响机组使用,因此该方式仅在螺杆直径小于320mm的大型造粒机组上有应用的实例。
中国专利(200810011909.1)公开了一种具有同层布置的双通道机筒,如图1、图2所示,该机筒在横截面的同一径向层面上,交替间隔开设有两组导热介质轴向通道,分别为加热介质流道和冷却介质流道,加热和冷却在机筒内进行,避免内外温差过大,但是该同层布置的双通道机筒,对于大型挤出机的机筒的温控仍存在以下缺陷:A、由于冷、热流道同层交替布置,造成交替处局部温差过大,特别是机筒端面焊接处,容易产生较大热应力变形,从而导致焊接开裂;B、同层布置,受到空间布局限制,难以实现通道的并联连通,造成导热介质与机筒之间的接触传热面积小,温度控制灵敏度低;C、该机筒上安装的温度传感器,只能测量机筒内流道附近表面温度,机筒外层温度得不到有效控制,造成能量浪费。
发明内容
本发明为解决大型挤出机机筒的温度控制问题,提出一种具有双层布置双通道结构的机筒及其温度控制方法,可以减小机筒内外及冷热交替的局部温差,使整个机筒温度分布均匀,而且局部不产生过大应力,有效地增加导热介质与机筒之间的接触传热面积,提高热交换效率。
本发明提出的机筒,具有双通道控温结构,所述的双通道是在机筒横截面的两个不同的径向层面上,开设有双层布置的导热介质通道,通道内有导热介质,外层通道由多条沿机筒周向开设的流道构成,内层通道由多条沿机筒轴向开设的流道构成,同层流道内通入一种导热介质(加热介质或冷却介质),同层的流道间采用并联形式。
所述的流道之间采用并联形式,是每层的流道是以两条或多条流道并联方式连通,使加热介质或冷却介质分别流入一组并联流道。
所述的通道内的导热介质,是加热介质或冷却介质,根据实际加工情况和控制要求,控制通道内的导热介质类型。
本发明的机筒上安装有两个温度传感器,分别控制机筒内外层通道温度。机筒上安装的两个温度传感器,挤出机正常运转过程中,内层传感器测量机筒内表面处温度,控制物料塑化质量;外层传感器测量机筒外层温度,起到机筒温度补偿作用。当外界温度变化影响机筒温度时,外层流道将起到调节作用;当物料流动变化影响机筒温度时,内层流道起到调节作用,以保证机筒温度恒定。由此可以将机筒看成内、外两层,使得机筒相对受控体积减少,可降低能量损耗。
所述流道中的导热介质优选为导热油。
本发明提供的机筒温度控制方法是:在机筒的双层布置的流道中通入导热介质,用在机筒上安装两个温度传感器T1、T2,分别测量机筒外层和内表面温度,流道中导热介质的连通由两个电磁换向阀V1和V2控制,其中V1控制通入机筒流道的导热介质类型的切换(加热介质或冷却介质),V2控制导热介质在两层流道中切换,管路上安装温度传感器T3和T4,控制加热器H1、H2以及换热器S1的冷却水控制阀V3的开闭,以控制导热介质的温度,导热介质流通具体控制方案如下:
(1)开车前预热过程:换向阀V1、V2将内、外层通道同时开启,机筒通入加热介质。
(2)开车前保温过程:
当机筒外层温度<设定温度,温度传感器T1发出信号,换向阀V1、V2控制外层通道开启,机筒外层通道通入加热介质。
当机筒内层温度<设定温度,温度传感器T2发出信号,换向阀V1、V2控制内层通道开启,机筒内层通道通入加热介质。
(3)正常加工过程中:
当机筒温度>>设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内、外层通道同时开启,机筒通入冷却介质。
当机筒温度>设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内层通道开启,机筒内层通入冷却介质。
当机筒温度<<设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内、外层通道同时开启,机筒通入加热介质。
当机筒温度<设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内层通道开启,内层通入加热介质。
正常加工时,挤出机的加热/冷却***主要起到冷却的作用,以导出机筒内物料黏性耗散生成的热量。
发明效果:本发明采用双层布置的双通道机筒,使得导热介质与机筒筒体之间的接触面积大大增加,不仅可以增大机筒加热/冷却***的换热面积、提高加热效率,而还改善了机筒温度控制的敏感度。有限元计算还表明,当采用160℃冷油冷却时,保证流道入口压力一致的前提下,本发明双层布置的双通道机筒温度从210℃(机筒平均温度)降低到200℃(机筒平均温度)所需时间为26s,而同层布置的双通道机筒所需时间为32s,降温时间减少12.5%,可见双层布置的双通道机筒要比同层布置的双通道机筒的控制灵敏性明显提高。
图8和图9分别为机筒平均温度为200℃时单层布置的双通道机筒与本发明双层布置的双通道机筒横截面内温度分布情况,可见采用双层布置的流道结构后,机筒内温度分布更加均匀,这样可以减少由于温度分布不均所产生的温度内应力,提高机筒安全系数和使用寿命。
本发明双层布置的双通道机筒在降温时,内层通道通入低温导热油,焊接堵板仅与低温导热油接触,不存在内外温差过大的现象,可降低由于热应力造成的焊缝开裂的可能。
双层布置的双通道机筒上安装有两个温度传感器,可以分别控制内外层温度,实现对机筒温度调节和相互补偿,控制物料塑化质量,进而使得机筒相对受控体积减少,可降低能量损耗。
附图说明
图1同层布置的双通道机筒三维模型图
图2同层布置的双通道机筒正面法兰剖视图
图3本发明双层布置的双通道机筒三维模型图
图4本发明双通道机筒横向剖面图
图5本发明双通道机筒轴向剖面图B-B剖视图
图6本发明双通道机筒内层轴向流道展开图
图7本发明双通道机筒外层周向流道展开图A-A剖视
图8同层布置的双通道机筒内温度分布图
图9本发明双层布置的双通道机筒内温度分布图
图10本发明双通道机筒温度控制流程图
具体实施方式
本发明中双层布置的双通道机筒结构如图3、图4、图5所示,在机筒横截面的两个不同的径向层面上,分两层开设有多条导热介质流道,根据实际加工情况和控制要求,流道内可通入加热介质或冷却介质,外层流道沿机筒周向开设,内层流道沿机筒轴向开设,每层的流道之间采用并联形式。内层流道展开图如图6所示,采用的是两路并联结构。导热介质由进油口流入管道26和25,然后顺序流经24和23、22和21、20和19、18和17、16和15、14和13、12和11、10和9、8和7、6和5、4和3、2和1,最后通过出油口流出管道。
外层流道展开图如图7所示,采用的是两路并联结构。导热介质由进油口流入流道27和28,然后顺序流经29和30、31和32、33和34,最后通过出油口流出。
本发明机筒的温度控制流程图见图10。机筒上开设有内外层传感器安装孔35和36,安装两个温度传感器T2和T1,外层传感器T1测量机筒外层温度,内层传感器T2测量机筒内表面处温度。油路连通由两个电磁换向阀V1和V2控制,其中V1控制通入机筒流道的导热介质类型(加热介质或冷却介质),V2控制导热介质究竟进入哪个机筒流道。管路上安装温度传感器T3和T4,控制加热器H1、H2以及换热器S1的冷却水控制阀V3的开闭,以控制导热介质的温度。导热介质流通具体控制方案如下:
1开车前预热过程
换向阀V1至A端,换向阀V2至B位置,内、外层通道同时开启,泵P1开启,机筒通入加热介质。
2开车前保温过程
当机筒外层温度<设定温度,温度传感器T1发出信号,换向阀V1至A端,换向阀V2至A端,外层通道开启,泵P1开启,机筒通入加热介质。
当机筒内层温度<设定温度,温度传感器T2发出信号,换向阀V1至A端,换向阀V2至C端,内层通道开启,泵P1开启,机筒通入加热介质。
3正常加工过程中
当机筒温度>>设定温度时,温度传感器T2发出信号,换向阀V1至B端,换向阀V2至B位置,内、外层通道同时开启,泵P1开启,机筒通入冷却介质。
当机筒温度>设定温度时,温度传感器T2发出信号,换向阀V1至B端,换向阀V2至C位置,内层通道开启,泵P1开启,机筒通入冷却介质。
当机筒温度<<设定温度时,温度传感器T2发出信号,换向阀V1至A端,换向阀V2至B位置,内、外层通道同时开启,通入加热介质。
当机筒温度<设定温度时,温度传感器T2发出信号,换向阀V1至A端,换向阀V2至C位置,内层通道开启,通入加热介质。
Claims (4)
1.一种螺杆挤出机机筒,具有双通道控温结构,其特征在于,在机筒横截面的两个不同的径向层面上,开设有双层布置的导热介质通道,外层通道由多条沿机筒周向开设的流道构成,内层通道由多条沿机筒轴向开设的流道构成,同层的流道间采用并联形式,所述的机筒上安装有两个温度传感器,分别控制机筒内外层温度。
2.根据权利要求1的机筒,其特征在于,所述的流道采用并联形式,是两条或多条流道并联。
3.根据权利要求1的机筒,其特征在于,所述的通道中的导热介质是加热介质或冷却介质。
4.根据权利要求1的螺杆挤出机机筒的温度控制方法,其特征在于:在机筒的双层布置的流道中通入导热介质,用机筒上安装的两个温度传感器T1、T2,分别测量机筒外层和内表面温度,流道中导热介质的连通由两个电磁换向阀V1和V2控制,其中V1控制通入机筒流道的导热介质加热或冷却类型,V2控制导热介质在两层流道中切换,由管路上安装的温度传感器T3和T4,控制加热器H1、H2以及换热器S1的冷却水控制阀V3的开闭,以控制导热介质的温度,具体控制方法是:(1)开车前预热过程:换向阀V1、V2将内、外层通道同时开启,机筒通入加热介质;(2)开车前保温过程:当机筒外层温度<设定温度,温度传感器T1发出信号,换向阀V1、V2控制外层通道开启,机筒外层通道通入加热介质;当机筒内层温度<设定温度,温度传感器T2发出信号,换向阀V1、V2控制内层通道开启,机筒内层通道通入加热介质;(3)正常加工过程中:当机筒温度>>设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内、外层通道同时开启,机筒通入冷却介质;当机筒温度>设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内层通道开启,机筒内层通入冷却介质;当机筒温度<<设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内、外层通道同时开启,机筒通入加热介质;当机筒温度<设定温度时,温度传感器T2发出信号,换向阀V1、V2控制内层通道开启,内层通入加热介质。
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CN103376807B (zh) * | 2012-04-13 | 2016-02-03 | 北京三博中自科技有限公司 | 一种电磁加热控温***及其风冷却*** |
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