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1. 发明授权

US4282719A Control system for regulating large capacity rotating machinery 失效
标题翻译：用于调节大容量旋转机械的控制系统
公开(公告)号：US4282719A
公开(公告)日：1981-08-11
申请号：US75044
申请日：1979-09-12
申请人： Kenneth J. Kountz , Richard A. Erth , Dean K. Norbeck
发明人： Kenneth J. Kountz , Richard A. Erth , Dean K. Norbeck
IPC分类号： H02P27/06 , F04B49/06 , F04D27/00 , F24F11/02 , F25B1/00 , F25B1/053 , F25B49/02
CPC分类号： F25B49/022 , F25B49/025 , F25B2600/021 , Y02B30/741
摘要： The control system disclosed herein regulates a centrifugal compressor which has inlet guide vanes adjustable to vary the compressor capacity. A variable speed motor is connected to drive the compressor, and variation of this motor speed provides another input for regulating the compressor capacity. A control system achieves optimum energy efficiency, while avoiding surge, by the manner in which the motor speed and the inlet guide vane positions are regulated. To do this, a control signal must be derived to indicate the compressor head value. This signal is achieved by providing two signals, one related to the absolute condenser pressure, and the second related to the absolute evaporator pressure. The control system operates on these two signals to provide a third signal which is a function of a ratio, in which the numerator is the difference between the condenser and evaporator pressures, and the denominator is the evaporator pressure. Alternative measurement and processing techniques are described. This signal affords a very good indication of the compressor head and thus achieves increased efficiency of system operation, with consequent energy conservation, especially at lighter loads and low heads.
摘要翻译：本文公开的控制系统调节离心式压缩机，其具有可调节的入口导向叶片以改变压缩机容量。连接变速电动机来驱动压缩机，并且该电动机速度的变化提供用于调节压缩机容量的另一个输入。控制系统通过电动机速度和入口导向叶片位置的调节方式实现最佳的能量效率，同时避免浪涌。为此，必须导出控制信号以指示压缩机机头值。该信号通过提供两个信号来实现，一个与绝对冷凝器压力相关，另一个与绝对蒸发器压力相关。控制系统对这两个信号进行操作，以提供第三个信号，它是一个比例的函数，其中分子是冷凝器和蒸发器压力之差，分母是蒸发器压力。描述了替代测量和处理技术。该信号提供了压缩机头的非常好的指示，从而实现了系统操作的更高的效率，从而节约了能量，特别是在较轻的负载和低的头部。

2. 发明授权

US4282718A Evaporator inlet water temperature control system 失效
标题翻译：蒸发器进水温度控制系统
公开(公告)号：US4282718A
公开(公告)日：1981-08-11
申请号：US75041
申请日：1979-09-12
申请人： Kenneth J. Kountz , Richard A. Erth , Dean K. Norbeck
发明人： Kenneth J. Kountz , Richard A. Erth , Dean K. Norbeck
IPC分类号： G05D23/00 , F25B1/053 , F25B49/02 , G05D23/24 , F25B5/00 , F25D5/00
CPC分类号： F25B49/025 , F25B49/022 , G05D23/1931 , G05D23/24 , F25B2600/021 , Y02B30/741
摘要： An evaporator inlet water temperature control system for controlling the inlet water temperature of an evaporator utilized in an inverter driven centrifugal chiller. The system creates the proper chilled water set point at the evaporator outlet needed to maintain the inlet water at its set point for greater efficiency of operation. Control is accomplished by generating an electrical error signal which is a function of an inlet water set point voltage and the actual inlet water temperature. A logic signal is produced as a function of the error signal detected by the circuit and establishes a dead zone band representing a range in which the error signal is acceptable. Output of the control system is passed to the capacity control circuit of an inverter driven centrifugal compressor chiller. When the inlet water temperature reaches its set point during pull-down, the logic output of the circuit sets a flip-flop which enables transmission gates to control changes in the outlet water set point as needed to balance the load of the cooling system.
摘要翻译：蒸发器入口水温控制系统，用于控制在逆变器驱动的离心式制冷机中使用的蒸发器的入口水温。该系统在蒸发器出口处产生适当的冷冻水设定点，将入口水保持在其设定点，以提高操作效率。通过产生作为入口水设定点电压和实际入口水温度的函数的电气误差信号来实现控制。产生逻辑信号作为由电路检测到的误差信号的函数，并且建立表示误差信号可接受的范围的死区带。控制系统的输出传递给变频器驱动的离心式压缩机制冷机的容量控制电路。当入口水温在下拉时达到设定点时，电路的逻辑输出设置一个触发器，使得传输门能够根据需要控制出水设定点的变化，以平衡冷却系统的负载。

3. 发明授权

US4546618A Capacity control systems for inverter-driven centrifugal compressor based water chillers 失效
标题翻译：基于变频驱动离心压缩机的冷水机组容量控制系统
公开(公告)号：US4546618A
公开(公告)日：1985-10-15
申请号：US652401
申请日：1984-09-20
申请人： Kenneth J. Kountz , Richard A. Erth
发明人： Kenneth J. Kountz , Richard A. Erth
IPC分类号： F04D27/00 , F04D27/02 , F25B1/00 , F25B1/053 , F25B49/02 , F04B49/00
CPC分类号： F25B49/02 , F25B1/053 , F25B2600/021 , Y02B30/741
摘要： A capacity control system for a refrigeration system including a compressor, a condensor, and an evaporator, all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guide vanes position, and an electrical speed motor connected to drive the compressor. The capacity control system includes a microprocessor responsive to continual measurements of a PRV signal, a compressor head signal and a suction flow signal for calculating a current operating point. The microprocessor determines whether the operating point is sufficiently away from a surge surface. The microprocessor will cause the operating point to move to a new operating point of a lower compressor speed and a more open PRV position if the operating point is sufficiently away from surge. In order to accomplish this, the microprocessor generates control signals to adjust both the speed of the compressor drive motor and the position of the inlet guide vanes. In an alternate embodiment, the microprocessor is responsive to continual measurements of a PRV signal, a motor speed signal, and a suction flow signal for generating such control signals.
摘要翻译：提供一种全封闭制冷回路连接的包括压缩机，冷凝器和蒸发器的制冷系统的容量控制系统。压缩机包括多个可调节的入口引导叶片，连接以调节入口导向叶片位置的马达以及连接以驱动压缩机的电动马达。容量控制系统包括响应于PRV信号的连续测量的微处理器，压缩机头信号和用于计算当前工作点的吸入流信号。微处理器确定工作点是否足够远离浪涌表面。如果工作点远离浪涌，微处理器将使工作点移动到较低压缩机转速和更开放的PRV位置的新工作点。为了实现这一点，微处理器产生控制信号以调节压缩机驱动马达的速度和入口导叶的位置。在替代实施例中，微处理器响应于PRV信号的连续测量，电动机速度信号和用于产生这种控制信号的吸入流信号。

4. 发明授权

US4351160A Capacity control systems for screw compressor based water chillers 失效
标题翻译：基于螺杆压缩机的冷水机组的容量控制系统
公开(公告)号：US4351160A
公开(公告)日：1982-09-28
申请号：US159572
申请日：1980-06-16
申请人： Kenneth J. Kountz , Richard A. Erth
发明人： Kenneth J. Kountz , Richard A. Erth
IPC分类号： F04C28/26 , F04C18/16 , F04C28/00 , F04C28/08 , F04C28/12 , F04C28/28 , F25B1/047 , F25D17/02
CPC分类号： F04C28/125 , F04C28/08 , F25B1/047
摘要： A control system for a rotary helical screw compressor of the variable speed type includes a variable speed motor driving the compressor for varying the compressor capacity and a slide valve member which is adjusted optimally for varying the volume of gas trapped in the working chamber prior to discharge as a function of the pressure ratio across the compressor. There is also provided a control system for a rotary helical screw compressor of the fixed speed type which include a first slide valve member for varying the compressor capacity through modulating the volume of gas trapped in the working chamber prior to compression and a second slide valve member for adjusting optimally the volume of gas trapped in the working chamber prior to discharge as a function of the pressure ratio across the compressor.
摘要翻译：用于变速式旋转螺杆式螺旋压缩机的控制系统包括驱动压缩机以改变压缩机容量的变速电动机和一个最佳调整的滑阀构件，用于在排放之前改变在工作室内捕获的气体的体积作为压缩机两端的压力比的函数。还提供了一种用于固定速度型旋转螺杆式螺旋压缩机的控制系统，该控制系统包括：第一滑动阀构件，用于通过调节在压缩之前在工作室中捕获的气体的体积来改变压缩机容量;以及第二滑阀构件用于根据整个压缩机的压力比来最佳地调节在排放之前在工作室中捕获的气体的体积。

5. 发明授权

US4151725A Control system for regulating large capacity rotating machinery 失效
标题翻译：用于调节大容量旋转机械的控制系统
公开(公告)号：US4151725A
公开(公告)日：1979-05-01
申请号：US816428
申请日：1977-07-18
申请人： Kenneth J. Kountz , Richard A. Erth , Bruce K. Bauman
发明人： Kenneth J. Kountz , Richard A. Erth , Bruce K. Bauman
IPC分类号： F04D27/02 , F04B49/10 , F25B1/00
CPC分类号： F04D27/0246 , F04D27/0261 , F04D27/0284 , F25B1/053 , F25B49/022 , F25B2339/047 , F25B25/005 , F25B2600/021 , F25B2600/026 , F25B2700/21163 , F25B2700/21173 , F25B2700/21175 , Y02B30/741
摘要： The control system of the invention regulates a centrifugal compressor having inlet guide vanes adjustable as one means for varying the compressor capacity. A variable speed motor is connected to drive the compressor, and provides another means for regulating the compressor capacity. The control system regulates the motor speed alone over one portion of the load variation curve, and regulates the motor speed jointly with the inlet guide vane opening over another portion of the load variation curve, to achieve the most energy-efficient operating condition while avoiding the surge condition. This optimum control path is realized by utilizing a signal which is a measure of the compressor head value. Compressor surge or instability is avoided by deriving a critical Mach number (speed indication) for any given operating condition, as a function of the compressor head and vane position, and preventing the motor speed from going below that Mach number under the specific operating conditions. The control system of the invention is useful both with existing equipment, by way of retrofit, and with newly manufactured and installed equipment.
摘要翻译：本发明的控制系统调节离心压缩机，该离心式压缩机具有作为改变压缩机容量的一种装置可调节的入口导向叶片。连接变速电动机来驱动压缩机，并提供另一种调节压缩机容量的装置。控制系统仅通过负载变化曲线的一部分来调节电动机速度，并且通过与负载变化曲线的另一部分上的入口导向叶片开度一起调节电动机速度，以实现最节能的操作条件，同时避免浪涌状况。该最佳控制路径通过利用作为压缩机头值的测量值的信号来实现。通过根据压缩机头部和叶片位置导出任何给定操作条件的关键马赫数（速度指示）来避免压缩机浪涌或不稳定，并且防止电机速度在特定工作条件下低于该马赫数。本发明的控制系统与现有设备，改造方式以及新制造和安装的设备都是有用的。

6. 发明授权

US4317074A Inverter-motor system with different control characteristics for inverter voltage and frequency 失效
标题翻译：逆变电机系统具有不同的控制特性，适用于变频器的电压和频率
公开(公告)号：US4317074A
公开(公告)日：1982-02-23
申请号：US75291
申请日：1979-09-12
申请人： Richard A. Erth
发明人： Richard A. Erth
IPC分类号： H02P23/00 , H02P27/06 , H02P5/34
CPC分类号： H02P27/06 , H02P23/28
摘要： An inverter-motor combination is regulated in accordance with this invention to minimize deterioration of the power factor as the inverter is reduced from 100% load. This is accomplished by sensing the motor current and providing a control signal to regulate the inverter output frequency in accordance with a first function, representing virtually linear decrease in frequency as the load is reduced from 100% to substantially 70% of full load. A constant voltage stage is connected to regulate the d-c bus controller to provide a modified control signal for regulating the d-c bus level according to a second function, maintaining the d-c bus voltage at virtually 100% while the load is reduced to 70%. Thus the d-c bridge is not phased back and the power factor of the complete system is not degraded over this described operating range.
摘要翻译：根据本发明调节逆变器 - 电机组合，以使逆变器从100％负载减小而使功率因数的降低最小化。这是通过感测电动机电流并提供控制信号来根据第一功能来调节逆变器输出频率，当负载从满载的100％降低到大约70％时，表示实际上频率上的线性减小。连接恒压级以调节d-c总线控制器，以提供修改的控制信号，用于根据第二功能调节d-c总线电平，并将d-c总线电压保持在几乎100％，同时将负载降至70％。因此，d-c桥并没有相位退回，整个系统的功率因数在此描述的工作范围内不会降低。

7. 发明授权

US06317895B1 Safety helmet assembly 有权
标题翻译：安全头盔总成
公开(公告)号：US06317895B1
公开(公告)日：2001-11-20
申请号：US09353504
申请日：1999-07-14
申请人： Richard A. Erth , Layton A. Wise
发明人： Richard A. Erth , Layton A. Wise
IPC分类号： A42B300
CPC分类号： A42B3/06 , A42B3/10
摘要： A safety helmet having a rigid outer shell, a shock absorbing layer inside of the outer shell, and a shield layer fabricated from a strong and lightweight material positioned between the outer shell and the shock absorbing layer. The shield layer is preferably free to move relative to the outer shell in a direction toward the shock absorbing layer.
摘要翻译：一种安全头盔，具有刚性外壳，外壳内部的减震层，以及由位于外壳和冲击吸收层之间的强而轻质材料制成的屏蔽层。屏蔽层优选地在朝向冲击吸收层的方向上相对于外壳自由移动。

8. 发明授权

US4182137A Liquid cooling system for hermetically sealed electric motor 失效
标题翻译：用于气密电动机的液体冷却系统
公开(公告)号：US4182137A
公开(公告)日：1980-01-08
申请号：US866428
申请日：1978-01-03
申请人： Richard A. Erth
发明人： Richard A. Erth
IPC分类号： H02K9/00 , H02K1/20 , H02K1/32 , H02K9/19 , F25B31/00
CPC分类号： H02K1/20 , H02K1/32 , H02K9/19
摘要： A cooling system having an electric drive motor utilizes a portion of the sub-cooled liquid which would otherwise be passed from the condenser through an expansion device to the evaporator to cool the motor. The rotor cooling passage which extends longitudinally through the outer portion of the rotor has its outermost surface (that is, the surface farthest removed from the center of the motor) shaped in an arc having the same center as the center of the rotor. This ensures even distribution of the cooling liquid under the high centrifugal forces developed during motor operation. The stator has a passage from its outside surface inwardly to the longitudinal cooling portion of the stator. The inwardly extending passage includes an orifice, sufficiently large to prevent contamination problems but of an appropriate size to ensure good throttling and thus provide good heat transfer. The cross-sectional areas of the cooling passages are sized to minimize the velocity of the generated vapor.
摘要翻译：具有电驱动电动机的冷却系统利用一部分过冷却的液体，否则其将从冷凝器通过膨胀装置传递到蒸发器以冷却电动机。沿转子的外部纵向延伸的转子冷却通道具有与转子中心具有相同中心的弧形的最外表面（即，距离电动机中心最远的表面）。这确保了在电动机运行期间产生的高离心力下冷却液的均匀分布。定子具有从其外表面向内到定子的纵向冷却部分的通道。向内延伸的通道包括足够大以防止污染问题但具有适当尺寸以确保良好节流并因此提供良好热传递的孔口。冷却通道的横截面积的尺寸被设计成使产生的蒸气的速度最小化。

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