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从所周知,液压系统中混进空气是很有害的,所以在系统工作前,总是设法排除其内部的空气。当排气孔中没有气泡冒出时,则认为气体已排尽。显然,这只是一种定性的检测方法。而有些设备,如石油勘探用的下井测试仪器,对其内部液压系统中残留空气量有严格限制,必须定量检测。下面介绍一种随引进测井仪器带来的残留气体测试装置。其结构原理如图所示。使用时,旋进螺杆1,使活塞3顶住缸筒2的底盖4。将油管接头放进盛有与被测系统相同液压油的容器中。缓慢地反向旋出螺杆,活塞随之上升,缸筒内逐渐充满液压油。上、下颠倒测试装置,再旋进螺杆排除空气。这个过程反复进行多次,直到没有气泡随油冒出。再将测试装置连接于已进行过排气的被测液压系统的排气孔。然后,徐徐旋进螺杆。当压力表读数为Obar、1bar、2bar 时,测得L 的值对应地为L_0、L_1、L_2,利用下式可算出被测液压系统中残留空气的体积为:
It is well-known that the mixing of air into a hydraulic system can be detrimental, so always try to get rid of the air inside it before working in the system. When there is no bubble in the vent, it is assumed that the gas has been exhausted. Obviously, this is just a qualitative test. However, some equipment, such as downhole testing instruments for petroleum exploration, have strict limits on the amount of residual air in their internal hydraulic systems and must be quantitatively tested. The following describes a kind of residual gas test device brought with the introduction of logging tools. The structure of the principle as shown. In use, screw the screw 1 so that the piston 3 abuts the bottom cover 4 of the cylinder 2. Place the tubing fitting in a container containing the same hydraulic fluid as the system under test. Slowly reverse the screw out, the piston increases, the cylinder filled with hydraulic oil gradually. Up and down the test device, then screw into the screw to exclude air. This process is repeated several times until no bubbles come out with the oil. Then connect the test device to the vents of the hydraulic system under test that has been vented. Then slowly screw into the screw. When the pressure gauge readings Obar, 1bar, 2bar, the measured value of L corresponding to L_0, L_1, L_2, the use of the following formula can be calculated residual air volume in the hydraulic system is: