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    Method of maintaining the flow rate of a refrigerant while maintaining superheat
    41.
    发明授权
    Method of maintaining the flow rate of a refrigerant while maintaining superheat 有权

    公开(公告)号：US10429108B2

    公开(公告)日：2019-10-01

    申请号：US15792809

    申请日：2017-10-25

    Applicant: DunAn Microstaq, Inc.

    Inventor： Arvind P. Rao ,  Dhaman Kumar Besarla

    IPC: F25B41/06 ,  F25B39/02 ,  G01K15/00 ,  G01K13/02 ,  F25B49/02 ,  G05D23/19 ,  G05D23/20 ,  F25B39/04

    Abstract: A method of maintaining a fluid flow rate in a heating, ventilating, air conditioning, and refrigeration (HVAC-R) system while maintaining superheat in the HVAC-R system at a desired level includes: continuously measuring an operating fluid temperature of the HVAC-R system and calculating superheat at a pre-determined rate, determining if the calculated superheat is stable, measuring and recording an operating fluid pressure of the system each time the calculated superheat is stable, recording an average operating fluid pressure each subsequent time the superheat is stable, calculating an output PWM and reducing fluid flow through a metering valve when an actual PWM is greater than the calculated output PWM by adjusting a PWM signal to a microvalve in the metering valve, and increasing fluid flow through the metering valve when the actual PWM is less than the calculated output PWM by adjusting the PWM signal to the microvalve.

    Expansion valve
    43.
    发明授权
    Expansion valve 有权

    公开(公告)号：US10145594B2

    公开(公告)日：2018-12-04

    申请号：US15399792

    申请日：2017-01-06

    Applicant: DunAn Microstaq, Inc.

    Inventor： E. Nelson Fuller ,  Parthiban Arunasalam ,  Joe A. Ojeda ,  Gengxun K. Gurley ,  Chen Yang ,  Jennifer O'Keefe

    IPC: F25B41/06

    Abstract: A two-stage proportional control valve configured for use in a fluid system includes a valve body having a longitudinally extending valve body bore formed therethrough. A first stage microvalve is mounted within the valve body bore, and a second stage spool assembly is mounted within the valve body bore downstream of the microvalve. The second stage spool assembly includes a sleeve and a spool slidably mounted within the sleeve.

    METHOD AND STRUCTURE OF ATTACHMENT LAYER FOR REDUCING STRESS TRANSMISSION TO ATTACHED MEMS DIE
    44.
    发明申请
    METHOD AND STRUCTURE OF ATTACHMENT LAYER FOR REDUCING STRESS TRANSMISSION TO ATTACHED MEMS DIE 审中-公开

    公开(公告)号：US20180334382A1

    公开(公告)日：2018-11-22

    申请号：US15896796

    申请日：2018-02-14

    Applicant: DunAn Microstaq, Inc.

    Inventor： Wayne C. Long ,  Joseph L. Nguyen

    IPC: B81C3/00 ,  B81B7/00

    CPC classification number: B81C3/001 ,  B81B7/0048 ,  B81B2201/0264 ,  B81C2203/035

    Abstract: A method of attaching a MEMS die to a base includes selecting an attachment material (x), determining a maximum acceptable change in pressure due to mounting stress (dPtarget) transmitted to a MEMS die, determining a worst-case pressure difference transfer function of the attachment material (x) over a thickness (h) variation of the attachment material (x) using the equation: dPmaxx=h*Bx+Cx, wherein B=pressure variation/thickness (h), and C=pressure variation, substituting dPtarget for dPmaxx in the pressure difference transfer function and solving the equation for h, wherein h=(dPtarget−Cx)/Bx, and attaching the MEMS die to a base using the selected attachment material (x) having at least the calculated thickness (h).

    MICROVALVE HAVING A REDUCED SIZE AND IMPROVED ELECTRICAL PERFORMANCE
    49.
    发明申请
    MICROVALVE HAVING A REDUCED SIZE AND IMPROVED ELECTRICAL PERFORMANCE 有权
    具有减小尺寸和改进的电气性能的微型

    公开(公告)号：US20160053916A1

    公开(公告)日：2016-02-25

    申请号：US14713332

    申请日：2015-05-15

    Applicant: DunAn Microstaq, Inc.

    Inventor： Parthiban Arunasalam ,  Chen Yang ,  E. Nelson Fuller ,  Joe A. Ojeda, SR. ,  Gengxun Kara Gurley

    IPC: F16K99/00 ,  B81B7/00

    CPC classification number: B81B7/0061 ,  B81B2201/054 ,  B81B2203/0307 ,  B81B2203/0315 ,  F16K99/0011 ,  F16K99/0028 ,  F16K99/0044 ,  F16K2099/008

    Abstract: A plate is adapted for use in a microvalve and includes a displaceable member configured for movement between a closed position, wherein the displaceable member prevents fluid communication through the microvalve, and an opened position, wherein the displaceable member does not prevent fluid communication through the microvalve. The displaceable member includes an elongated arm portion, a plurality of actuator ribs connected through a central spine to the elongated arm portion, and a hinge portion. The actuator ribs have a first portion and a second portion, the first portion having a first end and a second end, the second end of the first portion connected to the central spine, the second portion having a first end and a second end, the second end of the second portion connected to the central spine. A channel is formed in the plate. A plurality of elongated openings are formed in the plate and define the actuator ribs, each elongated opening having longitudinally extending side edges. One of the elongated openings separates each rib in the second portion of ribs from an adjacent rib or the plate. The channel and a longitudinally extending side edge of one of the elongated openings separate the second portion of the actuator ribs from the plate and define an electrical isolation region.

    Abstract translation: 板适于用于微型阀，并且包括可移位构件，其构造成在关闭位置之间移动，其中可移位构件防止通过微型阀的流体连通和打开位置，其中可移位构件不阻止流体通过微型阀连通 。 可移动构件包括细长的臂部分，通过中心脊连接到细长臂部分的多个致动器肋和铰链部分。 致动器肋具有第一部分和第二部分，第一部分具有第一端和第二端，第一部分的第二端连接到中心脊，第二部分具有第一端和第二端， 第二部分的第二端连接到中心脊。 在板中形成通道。 多个细长的开口形成在板中并限定致动器肋，每个细长的开口具有纵向延伸的侧边缘。 一个细长的开口将肋的第二部分中的每个肋与相邻的肋或板分开。 一个细长开口的通道和纵向延伸的侧边缘将致动器肋的第二部分与板分隔开并限定电隔离区。

    THREE-PORT MICROVALVE WITH IMPROVED SEALING MECHANISM
    50.
    发明申请
    THREE-PORT MICROVALVE WITH IMPROVED SEALING MECHANISM 有权
    具有改进的密封机构的三端口微孔

    公开(公告)号：US20160047491A1

    公开(公告)日：2016-02-18

    申请号：US14743078

    申请日：2015-06-18

    Applicant: DunAn Microstaq, Inc.

    Inventor： Edward Nelson Fuller ,  Parthiban Arunasalam ,  Chen Yang ,  Joe A. Ojeda, SR. ,  Gengxun K. Gurley

    IPC: F16K99/00 ,  F16K11/065

    CPC classification number: F16K99/0028 ,  F16K99/0011 ,  F16K99/0059

    Abstract: A microvalve includes a first plate having an inner surface, a recessed region provided within the inner surface, a normally open fluid port and a normally closed fluid port provided within the recessed region. A first sealing structure extends about the normally open fluid port, and a second sealing structure extends about the normally closed fluid port. A second plate defines a non-movable portion and a movable portion. A surface of the non-movable portion abuts the inner surface of the first plate, the non-movable portion having an opening formed therethrough. The movable portion is formed within the opening, has an axis, and defines a displaceable member connected to the non-movable portion by a convoluted spring formed in the opening. The displaceable member is slidingly and axially movable within the opening between a first position, wherein the displaceable member cooperates with the second sealing structure to prevent fluid communication through the normally closed fluid port, and a second position, wherein the displaceable member does not cooperate with at least a portion of the second sealing structure to prevent fluid communication through the normally closed fluid port.

    Abstract translation: 微型阀包括具有内表面的第一板，设置在内表面内的凹入区域，设置在凹陷区域内的常开流体端口和常闭流体端口。 第一密封结构围绕常开流体端口延伸，并且第二密封结构围绕常闭流体端口延伸。 第二板限定不可移动部分和可移动部分。 不可移动部分的表面邻接第一板的内表面，不可移动部分具有通过其形成的开口。 可动部分形成在开口内，具有轴线，并且限定了通过形成在开口中的回旋弹簧连接到不可移动部分的可移动部件。 所述可移动构件在所述开口内在第一位置之间滑动和轴向地可移动，其中所述可移位构件与所述第二密封结构协作以防止流体连通通过所述常闭流体端口和第二位置，其中所述可移位构件不与 所述第二密封结构的至少一部分，以防止流体通过常闭流体端口连通。

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