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21. 发明授权

US4086072A Air source heat pump with multiple slide rotary screw compressor/expander 失效
标题翻译：空气源热泵带多个滑动旋转螺杆式压缩机/膨胀机
公开(公告)号：US4086072A
公开(公告)日：1978-04-25
申请号：US782675
申请日：1977-03-30
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F04C28/00 , F04C18/16 , F04C28/12 , F25B1/00 , F25B1/047 , F25B13/00 , F25B30/02 , F25B27/00 , G05D23/00
CPC分类号： F04C28/125 , F04C18/16 , F25B1/047 , F25B13/00 , F25B30/02 , F25B2313/023 , F25B2313/02791 , F25B2400/13
摘要： An air source heat pump system includes in a primary refrigeration circuit a hermetic screw compressor and a helical screw rotary expander selectively clutchable to the permanently coupled helical screw compressor and electric induction drive motor. A solar/reclaim evaporator alternately functions as an expander boiler to feed refrigerant vapor to the compressor injection slide valve or to the feed port of the helical rotary screw expander to cause the expander to drive the compressor under compressor load or to drive the electric induction motor as a generator with the compressor unloaded. The solar/reclaim evaporator and expander boiler may be selectively fluid connected to the injection slide valve or to the suction port of the compressor. The hydronic system heating condenser and water chilling evaporator coil may form basic input and rejection heat exchangers to cascaded building zone heat pumps. Additional heat input to the primary circuit may be provided by a fossil fueled combustion heater feeding through the expander of the hydronic system heating condenser.
摘要翻译：空气源热泵系统包括主冷冻回路中的密封螺杆式压缩机和螺旋式螺旋式旋转式膨胀机，其可选择性地与永久性联接的螺旋式螺杆式压缩机和电感应驱动电动机联动。交替发挥太阳能/回收蒸发器作为膨胀锅炉将制冷剂蒸汽输送到压缩机注入滑阀或螺旋旋转螺杆式膨胀机的进料口，使膨胀机在压缩机负载下驱动压缩机或驱动感应电动机作为压缩机卸载的发电机。太阳能/回收蒸发器和膨胀锅炉可以选择性地流体连接到喷射滑阀或压缩机的吸入口。液压系统加热冷凝器和水冷却蒸发器盘管可以形成级联建筑区热泵的基本输入和排除热交换器。可以通过化学燃料燃烧加热器提供进入主回路的额外的热量，该燃烧加热器通过液压循环系统加热冷凝器的膨胀器进料。

22. 再颁专利

USRE29283E Undercompression and overcompression free helical screw rotary compressor 失效
标题翻译：螺旋压缩机压缩和压缩过压
公开(公告)号：USRE29283E
公开(公告)日：1977-06-28
申请号：US692077
申请日：1976-06-02
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F04C28/12
CPC分类号： F04C28/125
摘要： An axially shiftable slide valve member in a rotary, helical screw compressor carries a port which senses the pressure of the working fluid in the trapped volume just before uncovering of the closed thread to the discharge port and compares that pressure with the line pressure at the discharge port and shifts the slide valve member to balance the pressures and prevent overcompression or undercompression of the compressor. The screw compressor may be provided with two identical but oppositely oriented slide valve members on opposite sides of the intermeshed helical screws with one slide valve member controlling the capacity of the compressor and the other balancing the closed thread pressure at discharge with discharge line pressure. Compressor rotation may be reversed to eliminate the need for a reversing valve where the compressor operates in heat pump or reverse flow defrost refrigeration applications, with the two slide valves trading functions.

23. 发明申请

US20080173034A1 HEAT PUMP APPARATUS AND METHOD 审中-公开
标题翻译：热泵装置及方法
公开(公告)号：US20080173034A1
公开(公告)日：2008-07-24
申请号：US11624743
申请日：2007-01-19
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F25B13/00
CPC分类号： F25B13/00 , F25B1/10 , F25B2313/02741 , F25B2313/0315 , F25B2400/01 , F25B2400/0401 , F25B2400/13 , F25B2700/2106
摘要： A heat pump system and method is presented having a primary compressor, a booster compressor, an economizer, a microprocessor, an air temperature sensor, and a temperature sensor for sensing a temperature commensurate with the boiling temperature of refrigerant in the outside coil. The microprocessor effects controlled operation of the primary compressor, the booster compressor and the economizer when a thermostat calls for heat and in accordance with predetermined ranges of air temperature. The microprocessor calculates a defrost trigger temperature, and defrost operation is initiated when the sensed refrigerant boiling temperature is lower than the trigger temperature for a period of time.
摘要翻译：本发明提供一种具有主压缩机，增压压缩机，节能器，微处理器，空气温度传感器和温度传感器的热泵系统和方法，用于感测与外部线圈中的制冷剂的沸腾温度相当的温度。当恒温器需要热量并根据预定的空气温度范围时，微处理器实现主压缩机，增压压缩机和节能器的受控操作。微处理器计算除霜触发温度，当感测到的制冷剂沸腾温度低于触发温度一段时间后，开始除霜操作。

24. 发明授权

US06141980A Evaporator generated foam control of compression systems 失效
标题翻译：蒸发器产生压缩系统的泡沫控制
公开(公告)号：US06141980A
公开(公告)日：2000-11-07
申请号：US245516
申请日：1999-02-05
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F25B41/06 , F25B49/02
CPC分类号： F25B41/062 , F25B2339/0242 , F25B2341/063 , F25B2400/075
摘要： A system for controlling the amount of foam ingested to a compressor of a cooling system is presented. The present invention utilizes a heated thermistor to control an electrically positioned expansion valve feeding liquid refrigerant to a system evaporator. The thermistor is controlled to be a few degrees warmer than the discharge saturation temperature of the refrigerant exiting the compressor. The saturation temperature corresponding to the compressor discharge pressure is calculated by a microprocessor and compared to the thermistor temperature. If the difference is greater or less than desired, the microprocessor will send the proper signals to the electrically positioned expansion valve thereby controlling the rate of foam ingested by the compressor.
摘要翻译：提出了一种用于控制吸入冷却系统的压缩机的泡沫量的系统。本发明利用加热的热敏电阻来控制将液体制冷剂供给系统蒸发器的电气定位膨胀阀。热敏电阻被控制为比离开压缩机的制冷剂的排放饱和温度温度几度。对应于压缩机排气压力的饱和温度由微处理器计算并与热敏电阻温度进行比较。如果差异大于或小于期望值，则微处理器将向电定位的膨胀阀发送适当的信号，从而控制由压缩机吸收的泡沫的速率。

25. 发明授权

US6093007A Multi-rotor helical-screw compressor with thrust balance device 失效
标题翻译：带推力平衡装置的多转子螺旋压缩机
公开(公告)号：US6093007A
公开(公告)日：2000-07-25
申请号：US6420
申请日：1998-01-13
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F04C18/16 , F04C29/00
CPC分类号： F04C29/0021 , F04C18/165
摘要： A compressor in accordance with the present invention includes a male rotor which is axially aligned with and in communication with two female rotors. The compressor includes a housing and a thrust balance configuration. The thrust balance configuration includes a stepped up portion mounted at the suction end of the male rotor and is exposed to fluid from the compressor at high pressure. The outside diameter of the thrust balance configuration is generally less than the crest diameter of the male rotor and sized to provide sufficient area to react thrust loads produced by the first rotor. The thrust balance configuration serves to balance the thrust loads imparted on the male rotor and allows for full axial discharge porting.
摘要翻译：根据本发明的压缩机包括与两个母转子轴向对准并与之连通的公转子。压缩机包括壳体和推力平衡构造。推力平衡构造包括安装在阳转子的吸入端处的高压部分，并且在高压下暴露于来自压缩机的流体。推力平衡构造的外径通常小于阳转子的峰值直径，并且其尺寸设计成提供足够的面积来反应由第一转子产生的推力负载。推力平衡构造用于平衡施加在阳转子上的推力载荷并允许完全轴向排出。

26. 发明授权

US5845509A Variable speed parallel centrifugal compressors for HVAC and refrigeration systems 失效
标题翻译：用于HVAC和制冷系统的变速平行离心式压缩机
公开(公告)号：US5845509A
公开(公告)日：1998-12-08
申请号：US937984
申请日：1997-09-26
申请人： David N. Shaw , Giridhari L. Agrawal
发明人： David N. Shaw , Giridhari L. Agrawal
IPC分类号： F04D27/02 , F25B1/053 , F25B49/02 , F25B7/00 , F04B41/06
CPC分类号： F25B1/053 , F04D27/0261 , F25B49/022 , F25B2400/075 , F25B2400/0751 , F25B2600/0253 , Y02B30/741
摘要： A plurality of variable speed centrifugal compressors operated in parallel form an HVAC or refrigeration system. The compressors are operated at proportionally synchronized speeds throughout their range of operation.
摘要翻译：多个并联运行的变速离心压缩机形成HVAC或制冷系统。压缩机在整个操作范围内按比例同步的速度运行。

27. 发明授权

US5044894A Capacity volume ratio control for twin screw compressors 失效
标题翻译：双螺杆压缩机的容量比控制
公开(公告)号：US5044894A
公开(公告)日：1991-09-03
申请号：US620116
申请日：1990-11-30
申请人： Michael G. Field , David N. Shaw
发明人： Michael G. Field , David N. Shaw
IPC分类号： F04C18/16 , F01C1/16 , F04B23/04 , F04B49/00 , F04B49/02 , F04C3/00 , F04C28/06 , F04C28/12 , F04C28/26
CPC分类号： F04C28/125
摘要： The slide valve and the slide stop of a screw compressor are infinitely positionable over their range of movement. Movement is achieved by fluid pressure acting across an actuating piston in combination with the fluid pressure acting on the slide valve and slide stop plus a spring bias.

28. 发明授权

US4938029A Unloading system for two-stage compressors 失效
标题翻译：两级压缩机卸载系统
公开(公告)号：US4938029A
公开(公告)日：1990-07-03
申请号：US374907
申请日：1989-07-03
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F25B1/10 , F25B5/02 , F25B40/02
CPC分类号： F25B40/02 , F25B1/10 , F25B5/02 , F25B2400/13 , F25B2600/2509 , F25B2700/2104 , F25B2700/21152
摘要： An economizer is connected to a fluid line connecting the first and second stages of a compressor at a point downstream of the bypass for unloading the first stage. The economizer flow controls the discharge temperature of the second stage and, in addition, coacts with the bypassing of the first stage such that all of the flow supplied to the second stage is at system suction pressure when the bypass is fully open.

29. 发明授权

US4748820A Refrigeration system 失效
标题翻译：制冷系统
公开(公告)号：US4748820A
公开(公告)日：1988-06-07
申请号：US1213
申请日：1987-01-07
申请人： David N. Shaw
发明人： David N. Shaw
IPC分类号： F25D13/00 , F25B1/10 , F25B5/00 , F25B5/02 , F25B41/04 , F25B49/02 , F25B7/00
CPC分类号： F25B5/02 , F25B1/10 , F25B41/04 , F25B49/022 , F25B5/00 , F25B2400/075 , F25B2400/13 , F25B2400/22 , F25B2600/021 , Y02B30/741
摘要： A unique multi-stage refrigeration system for multiple product-display cases in which each display case has a low-stage booster compressor disposed therein. Each booster compressor compresses refrigerant received from the evaporator in its display case and feeds same to a bank of high-stage compressors disposed in a remotely located equipment room. A mechanical sub-cooler is provided for controlling liquid refrigerant temperature, and an improved lubrication system is provided for balancing the distribution of lubricant throughout the system. Several modifications of the system are also shown.
摘要翻译：一种独特的多级制冷系统，用于多个产品展示柜，其中每个展示柜具有设置在其中的低级增压压缩机。每个增压压缩机将在显示器壳体中从蒸发器接收的制冷剂压缩并将其馈送到设置在远程设备室中的高级压缩机组。提供了用于控制液体制冷剂温度的机械副冷却器，并且提供改进的润滑系统以平衡润滑剂在整个系统中的分布。还显示了系统的几个修改。

30. 发明授权

US4478054A Helical screw rotary compressor for air conditioning system having improved oil management 失效
公开(公告)号：US4478054A
公开(公告)日：1984-10-23
申请号：US513182
申请日：1983-07-12
申请人： David N. Shaw , Clifford T. Bulkley
发明人： David N. Shaw , Clifford T. Bulkley
IPC分类号： F04C18/16 , F04C28/28 , F04C29/02 , F25B1/047 , F25B27/00
CPC分类号： F04C29/026 , F25B1/047 , Y10S418/01
摘要： A helical screw rotary compressor for a closed loop refrigeration system such as an air conditioning system for a bus or like vehicle is connected in series with a condenser and an evaporator, in that order, with the evaporator at a raised position relative to the compressor and utilizes a vaporizable refrigerant which is miscible with a lubricating oil employed to lubricate the moving components of the screw compressor. The bus engine driven, clutch operated, helical screw rotors are mounted within parallel intersecting bores within the compressor housing. A slide valve underlies the intermeshed rotors and forms a portion of the screw compressor envelope, the rotors opening to a suction port connected to the outlet side of the evaporator above the rotors. A high pressure discharge port at one end of the intermeshed rotors leads to an auxiliary chamber bearing an unload cylinder which drives the slide valve and which opens at the top to a housing discharge port leading to the condenser. An oil separator is interposed within the auxiliary chamber above the unload cylinder. An oil drain passage leads from the auxiliary chamber to an oversized oil sump within the housing beneath the rotors. The slide valve slides in a recess within the casing underlying the rotors. On the suction port side of the recess, a further drain passage leads through a drainage check valve to the sump. This structural arrangement permits all condensed refrigerant and the oil to return by gravity flow to the oil sump whose capacity is at least 1.5 times the volume of the normal oil charge for the system. Condensed refrigerant miscible in the oil and the oil entraining the refrigerant, upon compressor shut down, accumulates in the sump but does not reach the intermeshed rotors and thus prevents clutch burnout by liquid locking during initiation of compressor operation with the clutch mechanically connecting the engine to the intermeshed helical screw rotors.

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