机械辅助换向全平衡式宽带长冲程抽油机

全平衡式宽带长冲程抽油机采用一种机械辅助换向装置。装置没有附加别的控制机构，只是把通常的整体配重分为主配重和副配重，另外增加了上、下缓冲限位器。机械辅助换向装置通过能量转换和形成力差，实现抽油杆运动的自动换向，使电动机正、反转都能在接近额定转速及空载条件下启动，保证工作可靠。ＣＹＪＤ１４—８—３７ＨＺＱ全平衡式宽带长冲程抽油机样机的厂内试验表明，反向启动电流在单边载荷为４４．７６ｋＮ时仅为额定电流的１．５倍，在连续运转条件下电动机温升不超过６０℃，能满足长冲程抽油要求。

Full-Balanced Load-Belt Pumping Unit with Mechanical Reversing Device

The full-balanced load-belt pumping unit with mechanical reversing device adopts a main counterbalance and an auxiliary counterbalance with up and down limit buffers instead of the conventional counterbalance. With the mechanical reversing device, the reciprocating motion of the sucker rod string is accomplished by means of energy transformation, and the electric motor can be started at a speed close to the rated speed under the condition of idling. Plant test of a prototype shows that this kind of pumping unit can satisfy the requirement of long stroke oil pumping.