公开(公告)号：WO1991011694A1

公开(公告)日：1991-08-08

申请号：PCT/US1991000270

申请日：1991-01-14

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  MYHRE, Douglas, C. ,  O'BRIEN, Richard, J. ,  PUI, David, Y., H. ,  TSAI, Chuen-Jinn

IPC: G01J05/02

CPC classification number: G01J5/0022 ,  B08B17/02 ,  G01J1/0411 ,  G01J5/0088 ,  G01J5/02 ,  G01J5/029 ,  G01J5/041 ,  G01J5/08 ,  G01J5/0875 ,  G01J5/0893

Abstract: A purging air flow system that causes air to pass over a pyrometer lens or window (28) to keep it clean and free from particulate contaminants has an annular, continuous slot (50) for air inlet around the periphery of the lens (28) to permit flow of air across the lens (28) without any obstructions in the path of flow inwardly from the outer edge of the lens (28). An asymmetric flow pattern is established across the lens surface, either by having a differential size slot (50) at different peripheral portions of the peripheral edge of the lens or window (28), or by providing a radial swirl about the axis of the window (28) so that when the air goes through the slot (50), the tangential velocity creates a moving asymmetric flow pattern on the window surface (28A).

公开(公告)号：WO1989002069A1

公开(公告)日：1989-03-09

申请号：PCT/US1988002974

申请日：1988-08-26

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  O'BRIEN, Richard, J. ,  MYHRE, Douglas, C.

IPC: G01J05/08

CPC classification number: G01J5/0088 ,  G01J5/02 ,  G01J5/029 ,  G01J5/041 ,  G01J5/08 ,  G01J5/0806 ,  G01J5/0818 ,  G01J5/0893 ,  G02B27/0006 ,  G03F7/70933

Abstract: A purging air flow system for passing air over a lens (28) to keep it clean and free from particulate contaminants and also for providing a positive flow of air away from the lens (28) has baffles (58A-58D, 96, 104) which cause a flow across the lens (28) that is not symmetrical to avoid a dead air or stagnation zone in the center of the lens (28). The air supply used for such purging is controlled adequately so the flow changes direction and particules are removed from the main flow of purge air by inertial separation prior to the time the air contacts the lens (28). Such air entrained particles might otherwise deposit on the lens (28). A flow control orifice (65) also may provide a secondary flow to carry the particle separated from the main flow out of the flow passageway (39).

Abstract translation: 用于将空气通过透镜（28）以保持其清洁并且不含颗粒污染物并且还用于从透镜（28）提供正向空气流的吹扫空气流动系统具有挡板（58A-58D，96,104） 其导致透镜（28）流过不对称的流动，以避免透镜（28）的中心处的死空气或停滞区域。 用于这种清洗的空气供应被充分地控制，使得流体改变方向，并且在空气接触透镜（28）之前通过惯性分离从吹扫空气的主流中除去颗粒。 这种空气夹带的颗粒否则会沉积在透镜（28）上。 流量控制孔口（65）还可以提供二次流以将从主流体分离的颗粒运送出流动通道（39）。

公开(公告)号：EP0512057A1

公开(公告)日：1992-11-11

申请号：EP91904131.0

申请日：1991-01-14

Applicant: ROSEMOUNT INC.

Inventor： MYHRE, Douglas, C. ,  O'BRIEN, Richard, J. ,  PUI, David, Y., H. ,  TSAI, Chuen-Jinn

IPC: G01J5 ,  B08B17

CPC classification number: G01J5/0022 ,  B08B17/02 ,  G01J1/0411 ,  G01J5/0088 ,  G01J5/02 ,  G01J5/029 ,  G01J5/041 ,  G01J5/08 ,  G01J5/0875 ,  G01J5/0893

Abstract: Un système de purge par circulation d'air sur une lentille pyrométrique ou fenêtre (28) permettant de la maintenir propre et sans particules contaminantes, possède une fente continue annulaire d'admission d'air autour de la périphérie de la lentille (28) qui permet une circulation d'air interne autour de celle-ci libre de toute obstruction depuis le bord extérieur de la lentille (28). On établit une circulation asymétrique sur la surface de la lentille, soit par création d'une différence dans la taille de la fente (50) selon différentes zones autour de la bordure périphérique de la lentille ou fenêtre (28), soit par création d'un tourbillon radial autour de l'axe de la fenêtre (28) de sorte que, lorsque l'air passe à travers la fente (50), la vitesse tangentielle provoque une circulation asymétrique sur la surface de la fenêtre (28).

公开(公告)号：EP0378575B1

公开(公告)日：1994-05-25

申请号：EP88908561.9

申请日：1988-08-26

Applicant: ROSEMOUNT INC.

Inventor： O'BRIEN, Richard, J. ,  MYHRE, Douglas, C.

IPC: G01J05/08

CPC classification number: G01J5/0088 ,  G01J5/02 ,  G01J5/029 ,  G01J5/041 ,  G01J5/08 ,  G01J5/0806 ,  G01J5/0818 ,  G01J5/0893 ,  G02B27/0006 ,  G03F7/70933

Abstract: A purging air flow system for passing air over a lens to keep it clean and free from particulate contaminants and also for providing a positive flow of air away from the lens has baffles which cause a flow across the lens that is not symmetrical to avoid a dead air or stagnation zone in the center of the lens. The air supply used for such purging is controlled adequately so the flow changes direction and particles are removed from the main flow of purge air by inertial separation prior to the time the air contacts the lens. Such air entrained particles might otherwise deposit on the lens. A flow control orifice also may provide a secondary flow to carry the particles separated from the main flow out of the flow passageway.

公开(公告)号：EP0378575A1

公开(公告)日：1990-07-25

申请号：EP88908561.0

申请日：1988-08-26

Applicant: ROSEMOUNT INC.

Inventor： O'BRIEN, Richard, J. ,  MYHRE, Douglas, C.

IPC: G01N21 ,  G01J5 ,  G02B27 ,  G03F7

CPC classification number: G01J5/0088 ,  G01J5/02 ,  G01J5/029 ,  G01J5/041 ,  G01J5/08 ,  G01J5/0806 ,  G01J5/0818 ,  G01J5/0893 ,  G02B27/0006 ,  G03F7/70933

Abstract: A purging air flow system for passing air over a lens to keep it clean and free from particulate contaminants and also for providing a positive flow of air away from the lens has baffles which cause a flow across the lens that is not symmetrical to avoid a dead air or stagnation zone in the center of the lens. The air supply used for such purging is controlled adequately so the flow changes direction and particles are removed from the main flow of purge air by inertial separation prior to the time the air contacts the lens. Such air entrained particles might otherwise deposit on the lens. A flow control orifice also may provide a secondary flow to carry the particles separated from the main flow out of the flow passageway.