公开(公告)号：US5062277A

公开(公告)日：1991-11-05

申请号：US604310

申请日：1990-10-29

申请人： Erric L. Heitmann ,  David N. Shaw

发明人： Erric L. Heitmann ,  David N. Shaw

IPC分类号： F01M5/02 ,  F01M11/12 ,  F25B31/00 ,  G01F23/24

CPC分类号： F01M11/12 ,  F01M5/021 ,  F25B31/002 ,  G01F23/247 ,  F25B2700/03

摘要： A thermally protected heater element is located in an oil sump such that it is normally located beneath the surface of the oil whereby the oil is heated and acts as a heat sink relative to the heater element. If the oil level drops below the heater element, the thermal protection disables the heater element and the compressor whereby the location of the heater element defines the nominal minimum oil level.

摘要翻译： 热保护的加热器元件位于油底壳中，使得其通常位于油表面下方，由此油被加热并且用作相对于加热器元件的散热器。 如果油位低于加热器元件，则热保护将禁止加热器元件和压缩机，由此加热器元件的位置限定标称最小油位。

公开(公告)号：US5170640A

公开(公告)日：1992-12-15

申请号：US664168

申请日：1991-03-04

申请人： Erric L. Heitmann ,  David N. Shaw ,  Arthur G. Mensing ,  Michael G. Field

发明人： Erric L. Heitmann ,  David N. Shaw ,  Arthur G. Mensing ,  Michael G. Field

IPC分类号： B01D17/04 ,  B01D17/00 ,  B01D17/02 ,  B01D17/025 ,  B01D17/028 ,  B01D17/12 ,  B01D35/02 ,  F04B39/16 ,  F25B43/02

CPC分类号： F25B43/02 ,  B01D17/0214 ,  F04B39/16 ,  F25B2400/02

摘要： Oil laden refrigerant is supplied tangentially into an oil separator for a primary removal of oil and then into a coalescer for a secondary removal of oil. Flow between the oil separator and coalescer is controlled by a valve so as to insure that a rapid build up of pressure takes place in the sump to insure adequate lubrication to the compressor.

公开(公告)号：US5927088A

公开(公告)日：1999-07-27

申请号：US69351

申请日：1998-04-29

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F25B1/10 ,  F25B13/00 ,  F25B7/00

CPC分类号： F25B13/00 ,  F25B1/10 ,  F25B2313/023 ,  F25B2400/13 ,  F25B2600/0253 ,  Y02B30/741

摘要： A boosted air source heat pump system is presented having a primary compressor, a booster compressor and an economizer. On activation of the heat pump system, the primary compressor is operated. When the primary compressor cannot meet the demand, the booster compressor is activated, but only upon receipt of a signal enabling the operation of the booster compressor. The booster compressor is preferably a variable speed booster, and its speed is controlled to be at or between an absolute minimum speed and an absolute maximum speed. The booster may be on the low side or the high side of the primary compressor. The operation of the economizer may be modulated to meet the demand on the system.

摘要翻译： 提出了一种升压空气源热泵系统，其具有主压缩机，增压压缩机和节能器。 在启动热泵系统时，主压缩机运行。 当主压缩机不能满足需求时，增压压缩机被激活，但是仅在接收到能够使增压压缩机运行的信号时才被激活。 增压压缩机优选为变速助力器，其速度控制在绝对最小速度和绝对最大速度之间或之间。 增压器可以在主压缩机的低侧或高侧。 可以调节节能器的运行以满足对系统的需求。

公开(公告)号：US5775117A

公开(公告)日：1998-07-07

申请号：US583505

申请日：1996-01-05

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F04C28/10 ,  F04C28/16 ,  F04C29/04 ,  F04C29/12 ,  F25B1/047 ,  F25B49/02 ,  F25B41/00 ,  F01C1/16

CPC分类号： F04C29/042 ,  F04C28/10 ,  F04C28/16 ,  F04C29/122 ,  F25B1/047 ,  F25B49/022 ,  F25B2339/0242 ,  F25B2400/075 ,  F25B2400/13 ,  F25B2400/23

摘要： A helical-screw rotary compressor having a twin rotor configuration or a multi-rotor (i.e., at least three) configuration with defined compressor induction and discharge ends has at least one unloader piston disposed at said compressor discharge end with an economizer injection port therein. The unloader pistons being opened and closed in fine discrete steps by microprocessor controlled stepping motors which drive linear actuators.

摘要翻译： 具有双转子结构或具有限定的压缩机感应和排出端的多转子（即至少三个）构型的螺旋螺杆式旋转式压缩机具有至少一个卸载器活塞，其设置在所述压缩机排出端，其中具有节能器注入口。 卸载器活塞通过微处理器控制的步进电机以微小的离散步骤打开和关闭，驱动线性致动器。

公开(公告)号：US5295362A

公开(公告)日：1994-03-22

申请号：US43415

申请日：1993-04-06

申请人： David N. Shaw ,  Edward A. Huenniger

发明人： David N. Shaw ,  Edward A. Huenniger

IPC分类号： F25B1/00 ,  F04C28/12 ,  F25B1/047 ,  F25B13/00 ,  F25B39/02 ,  F25B49/02 ,  F25B43/02

CPC分类号： F04C28/125 ,  F25B1/047 ,  F25B49/022 ,  F25B2600/0262

摘要： Loss of oil due to oil feedback is prevented in a screw compressor in a refrigeration application due to low capacity operation. The apparent suction temperature is compared to the temperature of the water exiting the evaporator to determine the apparent superheat and the loading is increased upon the apparent superheat reaching a predetermined level. Upon sensing a predetermined difference, an electronic slide valve block is initiated to prevent further unloading and loading may be initiated in a fixed amount, incrementally or on a pulsed basis.

摘要翻译： 由于低容量操作，在制冷应用中的螺杆式压缩机中防止了油反馈引起的油的损失。 将表观吸入温度与离开蒸发器的水的温度进行比较，以确定明显的过热，并且在明显的过热达到预定水平时负载增加。 一旦检测到预定的差异，则启动电子滑阀块以防止进一步卸载，并且可以以固定量，递增地或基于脉冲的方式启动负载。

公开(公告)号：US4878818A

公开(公告)日：1989-11-07

申请号：US214974

申请日：1988-07-05

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F04C28/00 ,  F04B49/02 ,  F04C18/02 ,  F04C28/16 ,  F04C28/26 ,  F04C29/00

CPC分类号： F04C28/16 ,  F04C18/0215 ,  F04C18/16

摘要： In a compressor of the type in which there is a movable trapped volume such as a screw or scroll type of compressor the trapped volume moves into and out of fluid contact with one or more valves. The valve(s) can provide fluid communication between the trapped volume and either suction for unloading or discharge for V.sub.i control.

公开(公告)号：US4594858A

公开(公告)日：1986-06-17

申请号：US636068

申请日：1984-07-30

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F25B1/10 ,  F25B5/02 ,  F25B41/04

CPC分类号： F25B41/04 ,  F25B1/10 ,  F25B5/02 ,  F25B2400/075 ,  F25B2400/13 ,  F25B2400/16 ,  F25B2400/22 ,  F25B2600/021 ,  Y02B30/741

摘要： A refrigeration system characterized by a first stage booster compressor feeding multiple parallel connected second stage compressors in an otherwise conventional closed loop refrigeration system utilizing an economizer between the condenser and evaporator and returning economizer vapor to the inter-stage pressure point between the first stage and second stage compressors operates in a very flexible and highly efficient manner by driving the booster, first stage compressor at variable speed and the second stage compressor(s) at constant speed, at maximum capacity, with those machines incapable of being unloaded. The control system utilizing a sensor for sensing evaporator pressure, evaporator temperature or suction pressure, varies the speed of the drive motor for the first stage booster compressor to initially slow down the booster and secondly connect or disconnect the second stage compressor from the system. The booster is always operating and the economizer is always active in the system. Since the high stage machines do not unload, they always operate at their peak efficiency.

摘要翻译： 一种制冷系统，其特征在于第一级增压压缩机在另一常规的闭环制冷系统中供给多个并联连接的第二级压缩机，其利用在冷凝器和蒸发器之间的节能器并且将节能器蒸汽返回到第一级和第二级之间的级间压力点 通过以不变速度驱动增压器，第一级压缩机和最大容量的恒定速度的第二级压缩机，这些机器不能被卸载，这些级压缩机以非常灵活和高效的方式运行。 利用用于感测蒸发器压力，蒸发器温度或吸入压力的传感器的控制系统改变用于第一级增压压缩机的驱动电动机的速度，以最初减速增压器，并且其次将第二级压缩机与系统连接或断开。 助推器始终运行，节能器在系统中始终处于活动状态。 由于高档机器不能卸载，所以它们始终以最高的效率运行。

公开(公告)号：USRE31379E

公开(公告)日：1983-09-13

申请号：US197401

申请日：1980-10-16

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F01C20/12

CPC分类号： F01C20/125

摘要： A helical screw rotary compressor or expander rotatably mounts intermeshed helical screw rotors within intersecting bores of a casing. An axially extending recess provided within the barrel portion of the casing in open communication with the bore bears a slide valve member whose inner face is complementary to the envelope of the casing. The slide valve member controls communication between the working chamber defined by the rotors and the casing to the outlet port and bears means at the end in communication with the outlet port for sensing the closed thread pressure adjacent to the end of the slide valve member closing off the outlet port. Comparison of that closed thread pressure to the outlet port pressure permits controlled shifting of the slide valve member to prevent overcompression and undercompression, when the unit acts as a compressor, or underexpansion or overexpansion when the unit acts as an expander. The slide valve member carries a bore parallel to its longitudinal axis which bears a cylindrical volume capacity control valve body which shifts to vary flow through axially spaced channels, selectively communicating the working fluid inlet to the bores bearing the intermeshed helical screw rotors. The slide valve member and the volume capacity control valve body carried thereby are independently movable.

公开(公告)号：US4181474A

公开(公告)日：1980-01-01

申请号：US882728

申请日：1978-03-02

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F04B39/02 ,  F01C21/02 ,  F04C18/16 ,  F04C29/00 ,  F16C19/38 ,  F16C19/54 ,  F16J15/44 ,  F01C1/16 ,  F01C21/06

CPC分类号： F16C19/386 ,  F01C21/02 ,  F04C18/16 ,  F04C29/0021 ,  F16C19/54 ,  F16J15/44 ,  Y10S417/902

摘要： In a vertical hermetic compressor, an inner cylindrical housing coaxially mounted within a sealed outer enclosure, sealably carries at its lower end, paired helical screw rotors defining with the inner housing a screw compressor compression chamber and supports coaxially with one of the screw rotors and constituting an axial extension thereof the compressor electrical drive motor by longitudinally spaced tapered roller bearings. Oil is bled from the sump and fed to the suction inlet tube to the compressor upstream of the working gas filter. Compressed working fluid is discharged axially downwardly with the lower tapered roller bearing assembly providing a minimal high pressure gap between the screw rotor ends and the stationary end plates. Entrained oil from the discharge passage which extends through the electric motor rotor seeks the suction side of the compressor through the upper of the two tapered roller bearing pack assemblies for controlled continuous lubrication of the upper bearing assembly. The compressed working fluid discharges axially through the center of the sealed outer enclosure at its upper end free of oil which is separated by impact with a curved plate deflector overlying the upper end of the electric motor and by centrifugal force provided by the electric motor rotor rotation. The upper bearing pack assembly for the screw rotors may employ needle bearings instead of tapered roller bearings and the lower bearing pack assemblies may incorporate radially extending needle bearings for thrust take up in lieu of one set of tapered roller bearings, with the needle bearings carried by a spherical, self-aligning mounting assembly. A capillary line passing through the compressor inlet passage carries oil from the sump to an injection port opening to a closed thread just after suction cut off for lubricating and sealing of the screw rotors.

摘要翻译： 在垂直封闭式压缩机中，同轴地安装在密封的外壳内的内圆柱形壳体可密封地承载在其下端，成对的螺旋式螺旋转子与内壳一起限定螺杆式压缩机压缩室，并与其中一个螺杆转子同轴地支撑并构成 通过纵向间隔开的圆锥滚子轴承将压缩机电动马达的轴向延伸。 油从油底壳中排出，并进入到进气管到工作气体过滤器上游的压缩机。 压缩的工作流体向下排出，下圆锥滚子轴承组件在螺杆转子端和固定端板之间提供最小的高压间隙。 从排出通道延伸通过电动机转子的夹带油通过两个圆锥滚子轴承组件的上部来寻求压缩机的吸入侧，以控制上轴承组件的连续润滑。 压缩的工作液体在其上端轴向通过密封外壳的中心排出，没有油，该油通过与电动机的上端上方的弯曲板偏转器的冲击和由电动机转子旋转提供的离心力分开 。 用于螺杆转子的上轴承组件可以采用滚针轴承而不是圆锥滚子轴承，下轴承组件可以包括径向延伸的滚针轴承用于推力吸取代替一组圆锥滚子轴承，滚针轴承由 一个球形的自对准安装组件。 通过压缩机入口通道的毛细管线，在抽吸切断后将油从贮槽运送到开口处的密封螺纹，用于润滑和密封螺杆转子。

公开(公告)号：US4178767A

公开(公告)日：1979-12-18

申请号：US917040

申请日：1978-06-19

申请人： David N. Shaw

发明人： David N. Shaw

IPC分类号： F25B47/02 ,  F25D21/00 ,  F25B13/00

CPC分类号： F25B47/025 ,  F25D21/002 ,  F25D2323/00283

摘要： A defrost control system includes in an electrical control circuit, a number of relay coils and contacts responsive thereto for insuring a delay in termination of the defrost mode and reverse refrigerant flow to the outdoor coil of the heat pump system to delay coil operation as an evaporator, and to effect automatically fan motor reversal and energization to blow air downwardly over the outdoor coil fins to assist gravity in removing the condensate during delay in initiation of heat pump heating cycle, thereby preventing refreezing of condensate on the coil fins.

摘要翻译： 除霜控制系统包括一个电气控制电路，多个继电器线圈和响应于此的接点，用于确保除霜模式终止的延迟并且使制冷剂流向热泵系统的室外线圈，从而将线圈操作延迟为蒸发器 并且自动地使风扇电机反转和通电，使空气向下吹过户外线圈翅片，以在延迟启动热泵加热循环期间帮助重力去除冷凝物，从而防止冷凝物在线圈翅片上的再冻结。