公开(公告)号：US4280852A

公开(公告)日：1981-07-28

申请号：US141112

申请日：1980-04-17

申请人： Heyward O. Dunham ,  Harry K. Dunham

发明人： Heyward O. Dunham ,  Harry K. Dunham

IPC分类号： B08B9/04 ,  F28G3/08 ,  B08B1/04 ,  B08B7/04 ,  B08B9/02

CPC分类号： F28G3/08 ,  B08B9/0323 ,  B08B9/045

摘要： A metal blade on a rotary cleaning tool for cleaning heat exchanger tubes, is insulated from companion cutting blades circularly spaced on the tube. A direct current voltage of low level is applied through the flexible cable and central shaft of the cleaning tool and is a part of a circuit including a current amplifier input and the heat exchanger tube being cleaned. As the tool removes foreign matter from the tube, the resistance to current flow from the insulated blade to the tube decreases, and the current level increases. The current signal, which is thereby an input signal analog of the thermo conductance from the sensor blade to the tube, is converted to a voltage analog. The voltage analog signal is then rectified to smooth out the effect of sensor bounce and rotational effects of mechanical drive system for the tool. The output signal from the rectifier is monitored by a zero to one volt DC meter movement and displayed on the meter face, which may include a color coding thereon from red to white or to green, whereby a red or low scale reading is indicative of a dirty or low thermo conductance tube, whereas a reading in the green at the high end of the scale is indicative of a clean or high thermo conductive tube. The visual observation provides the servicing mechanic a measurement base by which he can determine the required cleaning tool insertion rate and cleaning time cycle, and optimize the efficiency of the service provided.

摘要翻译： 用于清洁热交换器管的旋转清洁工具上的金属刀片与管上圆周间隔的伴随切割刀片绝缘。 通过柔性电缆和清洁工具的中心轴施加低电平的直流电压，并且是包括电流放大器输入和被清洁的热交换器管的电路的一部分。 随着工具从管中除去异物，从绝缘刀片到管子的电流阻力降低，电流水平增加。 因此，电流信号（其由模拟传感器刀片到管的热传导）被转换为电压模拟。 然后对电压模拟信号进行整流，以平滑传感器反弹和机械驱动系统对工具的旋转效果。 来自整流器的输出信号由零到一伏直流电表的运动进行监控，并显示在仪表面上，其可以包括从红色到白色或绿色的颜色编码，由此红色或低刻度读数指示 脏或低热导管，而在刻度高端的绿色读数表示干净或高热导管。 视觉观察为维修技工提供了一个测量基准，通过该测量基础可以确定所需的清洁工具插入率和清洁时间周期，并优化提供的服务的效率。

公开(公告)号：US4244072A

公开(公告)日：1981-01-13

申请号：US61608

申请日：1979-07-30

申请人： Heyward O. Dunham ,  Harry K. Dunham

发明人： Heyward O. Dunham ,  Harry K. Dunham

IPC分类号： F28G3/08 ,  B08B9/02

CPC分类号： B08B9/0323 ,  F28G3/08

摘要： A metal blade on a rotary cleaning tool for cleaning heat exchanger tubes, is insulated from companion cutting blades circularly spaced on the tube. A direct current voltage of low level is applied through the flexible cable and central shaft of the cleaning tool and is a part of a circuit including a current amplifier input and the heat exchanger tube being cleaned. As the tool removes foreign matter from the tube, the resistance to current flow from the insulated blade to the tube decreases, and the current level increases. The current signal, which is thereby an input signal analog of the thermo conductance from the sensor blade to the tube, is converted to a voltage analog. The voltage analog signal is then rectified to smooth out the effect of sensor bounce and rotational effects of mechanical drive system for the tool. The output signal from the rectifier is monitored by a zero to one volt DC meter movement and displayed on the meter face, which may include a color coding thereon from red to white or to green, whereby a red or low scale reading is indicative of a dirty or low thermo conductance tube, whereas a reading in the green at the high end of the scale is indicative of a clean or high thermo conductive tube. The visual observation provides the servicing mechanic a measurement base by which he can determine the required cleaning tool insertion rate and cleaning time cycle, and optimize the efficiency of the service provided.

摘要翻译： 用于清洁热交换器管的旋转清洁工具上的金属刀片与管上圆周间隔的伴随切割刀片绝缘。 通过柔性电缆和清洁工具的中心轴施加低电平的直流电压，并且是包括电流放大器输入和被清洁的热交换器管的电路的一部分。 随着工具从管中除去异物，从绝缘刀片到管子的电流阻力降低，电流水平增加。 因此，电流信号（其由模拟传感器刀片到管的热传导）被转换为电压模拟。 然后对电压模拟信号进行整流，以平滑传感器反弹和机械驱动系统对工具的旋转效果。 来自整流器的输出信号由零到一伏直流电表的运动进行监控，并显示在仪表面上，其可以包括从红色到白色或绿色的颜色编码，由此红色或低刻度读数指示 脏或低热导管，而在刻度高端的绿色读数表示干净或高热导管。 视觉观察为维修技工提供了一个测量基准，通过该测量基础可以确定所需的清洁工具插入率和清洁时间周期，并优化提供的服务的效率。