Dynamic seal test device for cryogenic fluid medium

Patent metadata

Field	Value
Publication number	US-11333571-B2
Application number	US-201915734881-A
Country	US
Kind code	B2
Filing date	Sep 16, 2019
Priority date	Aug 12, 2019
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

The invention provides a dynamic seal test device for cryogenic fluid medium. The dynamic seal test device includes stator unit, rotor unit, slipway, servo motor unit and sensors. The tested seal is installed inside the stator, and the thermal insulation stator and vacuum rotor together form a dynamic seal test structure. The seals and shaft sleeves can be flexibly replaced, which is beneficial to study the influence of different seal types, structure, and seal land configurations on the sealing performance. The servo motor provides power for the rotor and controls the rotation speed. The device greatly improves the thermal insulation capacity to avoid the gasification for the cryogenic fluid medium induced by the heat transfer from environment so that ensuring the stability of the test device.

First claim

The invention claimed is:

1. A dynamic seal test device for cryogenic fluid medium, wherein the dynamic seal test device for cryogenic fluid medium includes a stator unit, a rotor unit, a slipway, a servo motor unit and sensors; the stator unit and the rotor unit together form a dynamic seal test structure; the servo motor unit provides a power for the rotor unit, and the sensors are used to detect a sealing performance;
the stator unit comprises a vacuum flexible pipe, a nut, a metal stator, a thermal insulation sleeve, a gland, a countersunk head screw I, a countersunk head screw II, a fixed auxiliary ring, a rotary auxiliary ring and a measurement chamber; the metal stator consists of is a plurality of cylindrical structures of different diameters, and one end of the metal stator serves as a cryogenic fluid medium inlet pipe; a displacement sensor mounting hole I is installed on an end face of the metal stator, and a sensor mounting hole is drilled on a circumferential surface of the metal stator; the vacuum flexible pipe is connected with the cryogenic fluid medium inlet pipe of the metal stator through the nut; the thermal insulation sleeve is a cylindrical structure, one side is closed and has a medium inlet at a center; a displacement sensor mounting hole II is drilled at a non-circular center on a closed side of the thermal insulation sleeve; the thermal insulation sleeve is assembled into the metal stator by interference fit; an axis of the displacement sensor mounting hole I coincides with that of the displacement sensor mounting hole II; a medium inlet of the thermal insulation sleeve is connected with the cryogenic fluid medium inlet pipe; a seal is assembled into the metal stator by interference fit; the thermal insulation sleeve and the seal are assembled in turn; axes of the metal stator, the thermal insulation sleeve and the seal coincide; the gland is installed on an open end of the metal stator through the countersunk head screw I and the countersunk head screw II to press out the thermal insulation sleeve and the seal; a through-hole is machined on the gland; the measurement chamber is a hollow cylindrical structure, and two through-holes with different diameters are respectively drilled on two end faces, corresponding to outside diameters of the other end of the metal stator and a vacuum rotor; the fixed auxiliary ring is adhered to the metal stator; the rotary auxiliary ring is assembled on the through-hole corresponding to a position of the vacuum rotor; the measurement chamber is fixed on an outside of the metal stator by pressing out the fixed auxiliary ring ( 1 . 9 );
the slipway is installed on a base through four bolts I; the slipway comprises a slide and a threaded rod, and the slide moves directionally under action of the threaded rod; the stator unit is installed on the slide through a support, and the support is fixed on the slide by four bolts II; the stator unit moves directionally with the slide;
the rotor unit comprises the vacuum rotor, a shaft sleeve, a screw I, a screw II, a fore bearing, a rear bearing and a coupling; the vacuum rotor consists of a plurality of cylindrical structures of different outside diameters,
and a rotor inner channel ( 2 . a ) is machined inside the vacuum rotor along an axis for liquid medium flowing; an annular vacuum cavity is machined inside the vacuum rotor, and the annular vacuum cavity is coaxial with the vacuum rotor; a rotor external hole which is interlinked with the rotor inner channel is drilled in a middle of the vacuum rotor to discharge the cryogenic liquid medium; the shaft sleeve is of a structure with one side closed, and a through-hole is drilled on a closed side which is interlinked with the rotor inner channel for medium flowing; the shaft sleeve is mounted on an outside of one end of the vacuum rotor; the shaft sleeve and the vacuum rotor are interference fit, and their ends are fixed together with the screw I and the screw II; the fore bearing and the rear bearing are installed at ⅓ and ⅔ of a total length of the vacuum rotor, respectively; the fore bearing is assembled inside a fore bearing seat and the rear bearing is assembled inside a rear bearing seat; the fore bearing seat and the rear bearing seat are installed on the base by two bolts III and two bolts IV, respectively; the fore bearing is coaxial with the rear bearing; the vacuum rotor is coaxial with the metal stator;
the stator unit is driven by the slipway to make the shaft sleeve traverse the measurement chamber and the gland into the metal stator, so that the stator unit is sheathed on an outside of the rotor unit; a medium flowing channel is composed of a stator inner channel of the cryogenic fluid medium inlet pipe, a medium inlet of the thermal insulation sleeve, the through-hole of the shaft sleeve and the rotor inner channel; a gap between the measurement chamber and the rotor unit is sealed by the rotary auxiliary ring;
the servo motor unit comprises a motor, a servo driver and a cable; the motor and the vacuum rotor are directly linked through the coupling, and they are coaxial; the motor and the servo driver are linked through the cable to transmit a signal and control the motor; the motor is installed on a motor support through four bolts VII; the motor support is installed on a motor base through four bolts VI; the motor base is installed on the base through four bolts V;
the sensors comprise temperature sensors and pressure sensors; a temperature sensor I is installed on the outside of the metal stator corresponding to the thermal insulation sleeve to measure a temperature on an outside surface of the metal stator; a temperature sensor II is installed on the outside of the metal stator corresponding to the thermal insulation sleeve to measure a temperature on an inner surface of the metal stator; a mounting hole of the temperature sensor II is a blind hole, and a distance between a bottom of the blind hole and the inner surface of the metal stator is 0.5 mm; a temperature sensor III is installed on the outside of the metal stator corresponding to the thermal insulation sleeve to measure a temperature on an outside surface of the thermal insulation sleeve; a temperature sensor IV is installed on an outside of the metal stator corresponding to the thermal insulation sleeve and inserted into the thermal insulation sleeve to measure a temperature on the inner surface of the thermal insulation sleeve; a temperature sensor V is installed on the outside of the metal stator corresponding to the thermal insulation sleeve and to penetrate the thermal insulation sleeve to measure a temperature of the cryogenic fluid medium; in a sensor mounting area of the metal stator, a temperature sensor VI, a temperature sensor VII, a temperature sensor VIII, a temperature sensor IX, a temperature sensor X, a temperature sensor XI and a temperature sensor XII are installed on an outside surface of the seal and to penetrate the seal; these temperature sensors are used to measure a temperature of the cryogenic fluid medium at different positions; a pressure sensor I, a pressure sensor II, a pressure sensor III, a pressure sensor IV, a pressure sensor V, a pressure sensor VI and a pressure sensor VII are installed on an outside of the seal and to penetrate the seal, these pressure sensors are used to measure a pressure of the cryogenic fluid medium at different positions; gaps between installation points and the sensors are sealed with binder to prevent leakage; a gas concentration sensor is installed on an end face of the measurement chamber; a measuring head of the gas concentration sensor traverses the measurement chamber and is located inside the measurement chamber to measure the leakage of the cryogenic medium in real time; a power sensor is installed on the servo driver to measure a load power of the motor;
the cryogenic fluid medium enters the cryogenic fluid medium inlet pipe fr

Assignees

• Univ Dalian Tech

Inventors

• Wang Yongqing
• Han Lingsheng
• Liu Kuo
• Kong Fanze
• Liu Haibo
• Gan Yongquan
• Dai Minghua

Classifications

• G01M3/36

  by detecting change in dimensions of the structure being tested · CPC title

• G01M3/26 Primary

  by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors · CPC title

• G01M3/025 Primary

  Details with respect to the testing of engines or engine parts · CPC title

• F16J15/0887

  the sealing effect being obtained by elastic deformation of the packing · CPC title