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    • 13. 发明授权
    • Filament trimmer with adjustable cutoff blade
    • 长丝修剪器带可调节切割刀片
    • US06742263B2
    • 2004-06-01
    • US10117683
    • 2002-04-04
    • Bart T. EllsonChadwick A. ShafferThomas J. Beckey
    • Bart T. EllsonChadwick A. ShafferThomas J. Beckey
    • B26B700
    • A01D34/4163
    • A filament trimmer includes a rotatable trimmer head having an outwardly extending filament. The trimmer has a rear shield and a front wire guard. A cutoff blade is adjustably mounted on the rear shield to move between two different radially inward and outward positions. In the radially outward position, the cutoff blade cuts off the filament at a length in which the filament extends beyond the front guard prior to the filament becoming shortened due to breakage or wear. In the radially inward position, the cutoff blade cuts off the filament at a length in which the filament extends short of the front guard prior to the filament becoming shortened due to breakage or wear.
    • 长丝修剪器包括具有向外延伸的细丝的可旋转修剪器头。 修剪器具有后屏蔽和前线保护。 切断刀片可调节地安装在后护罩上以在两个不同的径向向内和向外位置之间移动。 在径向向外的位置,切断刀片在长丝由于断裂或磨损而缩短之前以长度延伸超过前护罩的长度切断长丝。 在径向向内的位置,切断刀片在长丝由于断裂或磨损而在长丝变短之前以长度延伸的方式切断长丝。
    • 20. 发明授权
    • Method and apparatus for improving cooling of a compressor element in an
air conditioning system
    • 用于改善空调系统中的压缩机元件的冷却的方法和装置
    • US4878355A
    • 1989-11-07
    • US315986
    • 1989-02-27
    • Thomas J. BeckeyLorne W. Nelson
    • Thomas J. BeckeyLorne W. Nelson
    • F25B31/00F25B41/06
    • F25B31/008F25B41/062F25B2341/065F25B2600/21F25B2700/21152Y02B30/72
    • A method for improving cooling of a compressor element used in an air conditioning system and having a refrigerant compressor and associated drive motor hermetically sealed in a fluid-tight shell includes the steps of detecting an excessive increase in the temperature of the compressor element, intermittently operating the system during the excessive temperature detection with a superheat of a refrigerant in the system below zero superheat degrees to concurrently allow liquid refrigerant to enter the shell to enhance the cooling of the compressor apparatus by the latent heat of vaporization of the liquid refrigerant and terminating the intermittent operation and the admittance of the liquid refrigerant into the compressor element upon a detection of a desired temperature of operation of the compressor element. An air conditioning apparatus utilizing this method includes a device for introducing an intermittent perturbation into the control of an expansion valve located in a refrigerant flow line in the air conditioning apparatus. The control of this valve is based on a desired superheat of the refrigerant. The device may include either the introduction of a cyclic or sinusoidal variation in a superheat setpoint used for control of the expansion valve or the introduction of a cyclic variation in the gain of a superheat controller having an output signal controlling the expansion valve.
    • 一种用于改善在空调系统中使用的压缩机元件的冷却的方法,并且具有密封在流体密封外壳中的制冷剂压缩机和相关联的驱动电机包括以下步骤:检测压缩机元件的温度的过度增加,间歇地操作 该系统在过度温度检测期间,系统中的制冷剂的过热低于零过热度,以同时允许液体制冷剂进入壳体,以通过液体制冷剂的蒸发潜热来加强压缩机装置的冷却,并终止 间歇操作和在检测到压缩机元件的所需操作温度时液体制冷剂进入压缩机元件的导入。 利用该方法的空气调节装置包括将间歇扰动引入位于空调装置的制冷剂流路中的膨胀阀的控制的装置。 该阀的控制基于所需的制冷剂过热。 该装置可以包括在用于控制膨胀阀的过热设定点中引入循环或正弦变化,或者引入具有控制膨胀阀的输出信号的过热控制器的增益中的循环变化。