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Rotary valve

A technology for switching valves and rotors, used in sliding valves, multi-port valves, valve devices, etc., to solve problems such as excessive closing force, wear of rotors and distribution plates, etc.

Inactive Publication Date: 2005-11-02
SIEMENS FRIMLEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with multi-port arrangements, this limits the complexity of the rotor and plate, or results in excessive closing forces that are significantly greater than those required to achieve an effective seal at the rotor interface
This results in unnecessary wear of the rotor and plate, or additional drive torque requirements

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] figure 1 A cross section of a rotary valve is shown, where the rotary valve is carried within a pressure vessel. The electric motor 1 drives the valve rotor 2 via a pin 3 mounted on a balancing piston 4 and fitting into a slot (not shown) of the rotor 2 . The motor and rotor are carried in a pressure vessel 5 which is connected through port 6 to the return line of the compressor.

[0025] The rotor 2 runs relative to the stator 7 . Both the rotor and the stator incorporate adjustment ports on their opposing surfaces, such as figure 2 Typical form shown. The compressor supply, provided through port 8, passes through the center of the stator 7 into the transverse slot 9 of the rotor. This slot communicates the gas flow with the various chambers of the PTR through ports 10, 11 and 12 in the stator 7. When the rotor rotates, the return flow of the PTR enters the valve pressure housing 5 through the stator ports 10 , 13 , 14 and the rotor ports 15 , 16 . The return fl...

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Abstract

A multiple port rotary valve for flow switching comprises a rotor (2), a stator (7), a compressor supply (8) and a compressor return (6). Gas is supplied via the compressor supply throughout a switching cycle such that the rotor is lifted away from the stator (7). The valve further comprises a balance ram to counteract the effect of the differential pressure produced by the compressor supply, such that a gas seal is formed at the rotor / stator interface.

Description

technical field [0001] This invention relates to rotary valves, particularly rotary valves used in pulse tube refrigerators. Background technique [0002] A typical application of a pulse tube refrigerator (PTR) is to maintain a cold environment in an insulating layer that surrounds a superconducting magnet cooled by liquid helium. Gaseous helium is commonly used as the working fluid in PTRs. The principle of operation of pulse tube refrigeration devices is well known. [0003] In one form of pulse tube refrigeration, it is necessary to sequentially deliver helium from a compressor to several interconnected chambers, including the PTR, through precisely controlled repeated cycles. The period rate, duty cycle and phase of these flow pulses are critical in achieving the desired thermal performance. Separate throttling devices are also employed to separately control at least one of the inflow and outflow from the PTR chamber flow path, but typically both. [0004] The flow ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K3/18F16K11/074F25B9/14
CPCF25B2309/006F16K3/188F25B9/145F25B2309/14181F16K11/0743
Inventor R·A·赫伦
Owner SIEMENS FRIMLEY
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