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公开(公告)号：US07484943B2
公开(公告)日：2009-02-03
申请号：US11891532
申请日：2007-08-09
CPC分类号： F04C18/084 , F04C18/16
摘要： A screw pump includes a housing and a pair of intermeshing screw rotors. The housing has an inlet port and an outlet port. Each rotor has a first portion whose lead angle decreases. The first portion and the housing form an inlet space and a pump space. Winding angle of the first portion has a first region and a second region. The first region is located in a predetermined range from the end on the first portion adjacent to the inlet port toward the outlet port. The second region is located adjacent to the first region. Reduction rate of the lead angle of the first portion in the first region is set smaller than that in the second region. The maximum lead angle of the first portion is set smaller than a lead angle which decreases at a constant rate in the first region and the second region.
摘要翻译： 螺杆泵包括壳体和一对相互啮合的螺杆转子。 壳体具有入口和出口。 每个转子具有引导角减小的第一部分。 第一部分和壳体形成入口空间和泵空间。 第一部分的卷绕角度具有第一区域和第二区域。 第一区域位于与入口相邻的第一部分的端部朝向出口的预定范围内。 第二区域位于第一区域附近。 第一区域中的第一部分的引导角的减小率被设定为小于第二区域的降低率。 第一部分的最大引导角被设定为小于在第一区域和第二区域以恒定速率减小的引导角。
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公开(公告)号：US20080038137A1
公开(公告)日：2008-02-14
申请号：US11891531
申请日：2007-08-09
IPC分类号： F04C15/00
CPC分类号： F04C18/16 , F01C21/108 , F04C18/084 , F04C25/02 , F04C29/12
摘要： A screw pump includes a housing and a pair of intermeshing screw rotors. An end face of the rotor adjacent to an inlet port of the housing is provided with an inlet opening. Each rotor has a first portion whose lead angle changes. The first portions and the housing cooperate to form an inlet space. During rotation of the rotors, communication between the inlet space and the inlet port is blocked by the first portions and the housing thereby to form a closed pump space adjacent to the inlet space. Volume of the pump space is set smaller than the maximum volume of the inlet space. A closure member is provided which covers at least a part of the inlet openings. The closure member closes the inlet space when the volume of the inlet space exceeds that of the pump space.
摘要翻译： 螺杆泵包括壳体和一对相互啮合的螺杆转子。 与壳体的入口相邻的转子的端面设置有入口开口。 每个转子具有引导角改变的第一部分。 第一部分和壳体协作形成入口空间。 在转子旋转期间，入口空间和入口之间的连通被第一部分和壳体阻挡，从而在入口空间附近形成封闭的泵空间。 泵空间的容积设定为小于入口空间的最大体积。 提供封闭构件，其覆盖入口开口的至少一部分。 当入口空间的体积超过泵的空间时，封闭构件封闭入口空间。
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公开(公告)号：US08556607B2
公开(公告)日：2013-10-15
申请号：US12837575
申请日：2010-07-16
IPC分类号： F01C21/10
CPC分类号： F04C2/16 , F04C2/123 , F04C11/005 , F04C14/02
摘要： A screw rotor is for use in a screw pump that pumps fluid by rotation of a pair of screw rotors engaged with each other in a rotor housing. The screw rotor includes a multiple-thread portion for pump suction side and a single-thread portion for pump discharge side. The screw rotor is formed so that the tooth profile of the multiple-thread portion is connected to the tooth profile of the single-thread portion through a boundary plane that is perpendicular to the rotation axis of the screw rotor. The first curved portion coincides with the third curved portion in the boundary plane.
摘要翻译： 螺杆转子用于螺旋泵，其通过在转子壳体中彼此接合的一对螺杆转子的旋转来泵送流体。 螺杆转子包括用于泵吸入侧的多螺纹部分和用于泵排出侧的单螺纹部分。 螺杆转子形成为使得多螺纹部分的齿廓通过与螺杆转子的旋转轴线垂直的边界平面连接到单螺纹部分的齿廓。 第一弯曲部分与边界平面中的第三弯曲部分重合。
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公开(公告)号：US08348650B2
公开(公告)日：2013-01-08
申请号：US12440690
申请日：2008-07-17
CPC分类号： F01C1/126 , F01C1/086 , F01C11/002 , F01C19/125 , F01C21/02 , F01C21/10 , F04C2230/60 , F04C2240/56
摘要： A housing of a Roots pump is configured by joining a lower housing member and an upper housing member that are separable from each other. With the upper and lower housing members joined together, an upper accommodating portion and a lower accommodating portion form a front bearing accommodating portion and a rear bearing accommodating portion, which accommodate whole bearings, respectively. The Roots pump further includes bearing holders attached to the bearings and fixed to the lower housing member so that the bearings are received in the lower accommodating portion in a positioned state.
摘要翻译： 罗茨泵的壳体通过连接可彼此分离的下壳体构件和上壳体构件而构成。 在上壳体构件和下壳体连接在一起的情况下，上容纳部分和下容纳部分分别形成容纳整个轴承的前轴承容纳部分和后轴承容纳部分。 罗茨泵还包括附接到轴承并固定到下壳体构件的轴承座，使得轴承在定位状态下容纳在下容纳部分中。
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公开(公告)号：US08215937B2
公开(公告)日：2012-07-10
申请号：US12373924
申请日：2007-07-19
CPC分类号： F04C18/126 , F01C1/086 , F01C1/126 , F01C11/002 , F01C19/125 , F01C21/02 , F01C21/10 , F04C18/086 , F04C23/001 , F04C2230/60 , F04C2240/30 , F04C2240/56
摘要： A housing (2) of a Roots pump (1) supports a drive shaft (3) and a driven shaft (4) with radial bearings (32, 33) so as to be rotatable. The housing (2) is formed by joining an upper housing member (20) to a lower housing member (10). The lower housing member (10) has lower bearing support portions (13), and the upper housing member (20) has upper bearing support portions (23). Opening edges (13a) of each lower bearing support portion (13) are positioned above the centers (P1) of the bearings (32, 33). An opening width (T1) of each lower bearing support portion (13) is smaller than the diameter (D1) of the bearings (32, 33). This structure suppresses the bearings (32, 33) from being separated from the lower housing member (10) during an assembling operation of the fluid machine.
摘要翻译： 罗茨泵（1）的壳体（2）以可旋转的方式支撑具有径向轴承（32,33）的驱动轴（3）和从动轴（4）。 壳体（2）通过将上部壳体构件（20）接合到下部壳体构件（10）而形成。 下壳体构件10具有下轴承支撑部分13，上壳体20具有上轴承支承部23。 每个下轴承支撑部分（13）的开口边缘（13a）位于轴承（32,33）的中心（P1）上方。 每个下轴承支撑部分（13）的开口宽度（T1）小于轴承（32,33）的直径（D1）。 该结构抑制了在流体机械的组装操作期间轴承（32,33）与下部壳体构件（10）分离。
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公开(公告)号：US20100047104A1
公开(公告)日：2010-02-25
申请号：US12373924
申请日：2007-07-19
CPC分类号： F04C18/126 , F01C1/086 , F01C1/126 , F01C11/002 , F01C19/125 , F01C21/02 , F01C21/10 , F04C18/086 , F04C23/001 , F04C2230/60 , F04C2240/30 , F04C2240/56
摘要： A housing (2) of a Roots pump (1) supports a drive shaft (3) and a driven shaft (4) with radial bearings (32, 33) so as to be rotatable. The housing (2) is formed by joining an upper housing member (20) to a lower housing member (10). The lower housing member (10) has lower bearing support portions (13), and the upper housing member (20) has upper bearing support portions (23). Opening edges (13a) of each lower bearing support portion (13) are positioned above the centers (P1) of the bearings (32, 33). An opening width (T1) of each lower bearing support portion (13) is smaller than the diameter (D1) of the bearings (32, 33). This structure suppresses the bearings (32, 33) from being separated from the lower housing member (10) during an assembling operation of the fluid machine.
摘要翻译： 罗茨泵（1）的壳体（2）以可旋转的方式支撑具有径向轴承（32,33）的驱动轴（3）和从动轴（4）。 壳体（2）通过将上部壳体构件（20）接合到下部壳体构件（10）而形成。 下壳体构件10具有下轴承支撑部分13，上壳体20具有上轴承支承部23。 每个下轴承支撑部分（13）的开口边缘（13a）位于轴承（32,33）的中心（P1）上方。 每个下轴承支撑部分（13）的开口宽度（T1）小于轴承（32,33）的直径（D1）。 该结构抑制了在流体机械的组装操作期间轴承（32,33）与下部壳体构件（10）分离。
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公开(公告)号：US20080044304A1
公开(公告)日：2008-02-21
申请号：US11891532
申请日：2007-08-09
IPC分类号： F04C18/08
CPC分类号： F04C18/084 , F04C18/16
摘要： A screw pump includes a housing and a pair of intermeshing screw rotors. The housing has an inlet port and an outlet port. Each rotor has a first portion whose lead angle decreases. The first portion and the housing form an inlet space and a pump space. Winding angle of the first portion has a first region and a second region. The first region is located in a predetermined range from the end on the first portion adjacent to the inlet port toward the outlet port. The second region is located adjacent to the first region. Reduction rate of the lead angle of the first portion in the first region is set smaller than that in the second region. The maximum lead angle of the first portion is set smaller than a lead angle which decreases at a constant rate in the first region and the second region.
摘要翻译： 螺杆泵包括壳体和一对相互啮合的螺杆转子。 壳体具有入口和出口。 每个转子具有引导角减小的第一部分。 第一部分和壳体形成入口空间和泵空间。 第一部分的卷绕角度具有第一区域和第二区域。 第一区域位于与入口相邻的第一部分的端部朝向出口的预定范围内。 第二区域位于第一区域附近。 第一区域中的第一部分的引导角的减小率被设定为小于第二区域的降低率。 第一部分的最大引导角被设定为小于在第一区域和第二区域以恒定速率减小的引导角。
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公开(公告)号：US07798794B2
公开(公告)日：2010-09-21
申请号：US11992700
申请日：2007-09-03
摘要： A cross section of a tooth profile of a first screw rotor (17) perpendicular to the rotor axis includes a tooth top arc (A1B1), a tooth bottom arc (C1D1), a first curve (A1C1), and a second curve (B1D1). The first curve (A1C1) is a first trochoidal curve that connects a first end (A1) of the tooth top arc (A1B1) to a second end (C1) of the tooth bottom arc (C1D1). The second curve (B1D1) connects the second end (B1) of the tooth top arc (A1B1) to the first end (D1) of the tooth bottom arc (C1D1). The second curve (B1D1) is a composite curve formed by an involute curve (B1E1) and a second trochoidal curve (E1D1), which extend continuously from each other at a first intersection point (E1). A screw pump (11) thus suppresses leakage of fluid with improved performance.
摘要翻译： 垂直于转子轴线的第一螺杆转子（17）的齿廓的横截面包括齿顶弧（A1B1），齿底弧（C1D1），第一曲线（A1C1）和第二曲线（B1D1 ）。 第一曲线（A1C1）是将齿顶弧（A1B1）的第一端（A1）与齿底弧（C1D1）的第二端（C1）连接的第一弯曲曲线。 第二曲线（B1D1）将齿顶弧（A1B1）的第二端（B1）与齿底弧（C1D1）的第一端（D1）连接。 第二曲线（B1D1）是通过在第一交点（E1）处彼此连续延伸的渐开线曲线（B1E1）和第二偏摆曲线（E1D1）形成的复合曲线。 因此，螺杆泵（11）能够以改进的性能来抑制流体泄漏。
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公开(公告)号：US20100178191A1
公开(公告)日：2010-07-15
申请号：US11992700
申请日：2007-09-03
IPC分类号： F04C2/16
摘要： A cross section of a tooth profile of a first screw rotor (17) perpendicular to the rotor axis includes a tooth top arc (A1B1), a tooth bottom arc (C1D1), a first curve (A1C1), and a second curve (B1D1). The first curve (A1C1) is a first trochoidal curve that connects a first end (A1) of the tooth top arc (A1B1) to a second end (C1) of the tooth bottom arc (C1D1). The second curve (B1D1) connects the second end (B1) of the tooth top arc (A1B1) to the first end (D1) of the tooth bottom arc (C1D1). The second curve (B1D1) is a composite curve formed by an involute curve (B1E1) and a second trochoidal curve (E1D1), which extend continuously from each other at a first intersection point (E1). A screw pump (11) thus suppresses leakage of fluid with improved performance.
摘要翻译： 垂直于转子轴线的第一螺杆转子（17）的齿廓的横截面包括齿顶弧（A1B1），齿底弧（C1D1），第一曲线（A1C1）和第二曲线（B1D1 ）。 第一曲线（A1C1）是将齿顶弧（A1B1）的第一端（A1）与齿底弧（C1D1）的第二端（C1）连接的第一弯曲曲线。 第二曲线（B1D1）将齿顶弧（A1B1）的第二端（B1）与齿底弧（C1D1）的第一端（D1）连接。 第二曲线（B1D1）是通过在第一交点（E1）处彼此连续延伸的渐开线曲线（B1E1）和第二偏摆曲线（E1D1）形成的复合曲线。 因此，螺杆泵（11）能够以改进的性能来抑制流体泄漏。
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公开(公告)号：US20090285711A1
公开(公告)日：2009-11-19
申请号：US12440690
申请日：2008-07-17
IPC分类号： F04C29/00
CPC分类号： F01C1/126 , F01C1/086 , F01C11/002 , F01C19/125 , F01C21/02 , F01C21/10 , F04C2230/60 , F04C2240/56
摘要： A housing of a Roots pump is configured by joining a lower housing member and an upper housing member that are separable from each other. With the upper and lower housing members joined together, an upper accommodating portion and a lower accommodating portion form a front bearing accommodating portion and a rear bearing accommodating portion, which accommodate whole bearings, respectively. The Roots pump further includes bearing holders attached to the bearings and fixed to the lower housing member so that the bearings are received in the lower accommodating portion in a positioned state.
摘要翻译： 罗茨泵的壳体通过连接可彼此分离的下壳体构件和上壳体构件而构成。 在上壳体构件和下壳体连接在一起的情况下，上容纳部分和下容纳部分分别形成容纳整个轴承的前轴承容纳部分和后轴承容纳部分。 罗茨泵还包括附接到轴承并固定到下壳体构件的轴承座，使得轴承在定位状态下容纳在下容纳部分中。
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