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    • 1. 发明授权
    • Boosted air source heat pump
    • 增压空气源热泵
    • US5927088A
    • 1999-07-27
    • US69351
    • 1998-04-29
    • David N. Shaw
    • David N. Shaw
    • F25B1/10F25B13/00F25B7/00
    • F25B13/00F25B1/10F25B2313/023F25B2400/13F25B2600/0253Y02B30/741
    • 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.
    • 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。
    • 6. 发明授权
    • Highly efficient flexible two-stage refrigeration system
    • 高效灵活的两级制冷系统
    • US4594858A
    • 1986-06-17
    • US636068
    • 1984-07-30
    • David N. Shaw
    • David N. Shaw
    • F25B1/10F25B5/02F25B41/04
    • F25B41/04F25B1/10F25B5/02F25B2400/075F25B2400/13F25B2400/16F25B2400/22F25B2600/021Y02B30/741
    • 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.
    • 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。
    • 7. 再颁专利
    • Combined pressure matching and capacity control slide valve assembly for
helical screw rotary machine
    • 螺旋螺旋旋转机组合压力匹配和容量控制滑阀组件
    • USRE31379E
    • 1983-09-13
    • US197401
    • 1980-10-16
    • David N. Shaw
    • David N. Shaw
    • F01C20/12
    • F01C20/125
    • 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.
    • 8. 发明授权
    • Vertical axis hermetic rotary helical screw compressor with improved
rotary bearings and oil management
    • 垂直轴密封旋转螺旋压缩机,具有改进的旋转轴承和油管理
    • US4181474A
    • 1980-01-01
    • US882728
    • 1978-03-02
    • David N. Shaw
    • David N. Shaw
    • F04B39/02F01C21/02F04C18/16F04C29/00F16C19/38F16C19/54F16J15/44F01C1/16F01C21/06
    • F16C19/386F01C21/02F04C18/16F04C29/0021F16C19/54F16J15/44Y10S417/902
    • 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.
    • 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。