公开(公告)号：US09631990B2

公开(公告)日：2017-04-25

申请号：US14889848

申请日：2013-12-27

Applicant: NANJING FORESTRY UNIVERSITY

Inventor： Jianjun Sun ,  Qiaoan Tu ,  Qiong Hu ,  Chenbo Ma ,  Qiuping Yu ,  Min Zhou

IPC: G01L3/02 ,  G01M3/28 ,  G01M3/26 ,  G01M13/00

CPC classification number: G01L3/02 ,  G01M3/26 ,  G01M3/2869 ,  G01M13/005

Abstract: A device for testing mechanical seal performance includes a main shaft (4), a working chamber (18) with two end covers (6, 13) respectively located at two ends thereof, and two groups of mechanical seals to be tested (7); wherein a shaft sleeve (5) and the main shaft (4) form a clearance fit and penetrate through the end covers (6, 13) at two ends of the working chamber (18) together; the shaft sleeve (5) extends outside U-shaped openings (23) which are arranged at two ends of the end covers (6, 13) and arranged on the same generatrix; driven pins (15) are arranged on the locations of the main shaft (4) corresponding to the U-shaped openings (23); the middle part of the shaft sleeve (5) is provided with two segments of threads having the same thread pitch and opposite rotating directions.

公开(公告)号：US20160097457A1

公开(公告)日：2016-04-07

申请号：US14894487

申请日：2014-04-21

Applicant: NANJING FORESTRY UNIVERSITY

Inventor： Jiajun Sun ,  Qiong Hu ,  Min Zhou ,  Qiaoan Tu ,  Chenbo Ma ,  Bo Yu

IPC: F16J15/34 ,  F16J15/00

CPC classification number: F16J15/3412 ,  F16J15/002 ,  F16J15/342

Abstract: A self-pumping hydrodynamic mechanical seal includes a rotating ring (3) and a stationary ring (11). More than three sets of backward curved grooves (39) are provided on a seal face of the rotating ring (3), outlets of the backward curved grooves (39) are provided at an external diameter portion of the seal face of the rotating ring (3), and an inlet (31) connects with a seal chamber (1) through a duct (30) of the rotating ring (3) or the stationary ring (11). When the rotating ring (3) rotates, a medium in the backward curved grooves (39) is accelerated into a high-speed fluid; under a centrifugal force, the high-speed fluid moves to an external diameter side of the rotating ring (3), so as to be pumped into the seal chamber (1) and generates a low-pressure area at the inlets (31) of the backward curved grooves (39); the medium in the seal chamber (1) is driven by a pressure difference, so as to flow into the backward curved grooves (39) through the duct (30), for forming circulation of self-pumping. During pumping the high-speed fluid, a flow speed of the high-speed fluid is slowed and a pressure of the high-speed fluid is increased, as a flow sectional area of the backward curved grooves (39) is increased, so as to generate an opening force which separates the rotating ring (3) from the stationary ring (11). The seal has desirable capabilities of self-lubrication, self-flushing, solid particle interference resistance, and optimal sealing performance.

Abstract translation: 自抽水力机械密封件包括旋转环（3）和固定环（11）。 在旋转环（3）的密封面上设置有三组后向弯曲槽（39），后向弯曲槽（39）的出口设置在旋转环的密封面的外径部 3），入口（31）通过旋转环（3）或固定环（11）的管道（30）与密封室（1）连接。 当旋转环（3）旋转时，向后弯曲槽（39）中的介质被加速成高速流体; 在离心力作用下，高速流体移动到旋转环（3）的外径侧，以便被泵送到密封室（1）中并且在入口（31）处产生低压区域 向后弯曲的凹槽（39）; 密封室（1）中的介质由压力差驱动，从而通过管道（30）流入后向弯曲槽（39），以形成自抽水循环。 在泵送高速流体期间，随着后向弯曲槽（39）的流动截面面积增加，高速流体的流速减慢，高速流体的压力增加，从而 产生将旋转环（3）与固定环（11）分离开的打开力。 密封件具有自润滑，自冲洗，坚固的颗粒抗干扰性和最佳密封性能所需的能力。

公开(公告)号：US20160146681A1

公开(公告)日：2016-05-26

申请号：US14889848

申请日：2013-12-27

Applicant: NANJING FORESTRY UNIVERSITY

Inventor： Jianjun Sun ,  Qiaoan Tu ,  Qiong Hu ,  Chenbo Ma ,  Qiuping Yu ,  Min Zhou

IPC: G01L3/02 ,  G01M3/26

CPC classification number: G01L3/02 ,  G01M3/26 ,  G01M3/2869 ,  G01M13/005

Abstract: A device for testing mechanical seal performance includes a main shaft (4), a working chamber (18) with two end covers (6, 13) respectively located at two ends thereof, and two groups of mechanical seals to be tested (7); wherein a shaft sleeve (5) and the main shaft (4) form a clearance fit and penetrate through the end covers (6, 13) at two ends of the working chamber (18) together; the shaft sleeve (5) extends outside U-shaped openings (23) which are arranged at two ends of the end covers (6, 13) and arranged on the same generatrix; driven pins (15) are arranged on the locations of the main shaft (4) corresponding to the U-shaped openings (23); the middle part of the shaft sleeve (5) is provided with two segments of threads having the same thread pitch and opposite rotating directions.

Abstract translation: 用于测试机械密封性能的装置包括主轴（4），具有分别位于其两端的两个端盖（6,13）的工作室（18）和待测试的两组机械密封件（7）; 其中轴套（5）和所述主轴（4）形成间隙配合并且在所述工作室（18）的两端穿过所述端盖（6,13）; 轴套（5）延伸在U形开口（23）的外侧，U形开口（23）布置在端盖（6,13）的两端并设置在同一母线上; 驱动销（15）布置在对应于U形开口（23）的主轴（4）的位置上; 轴套（5）的中间部分设有具有相同螺距和相反旋转方向的两段螺纹。