Jet type heat pump adopting multi-effect cascade ejecting mode and large pressure ratio vacuum pump

Abstract

The invention relates to a jet type heat pump adopting a multi-effect cascade ejecting mode and a large pressure ratio vacuum pump and belongs to the fields of industrial waste heat recovery and vacuum pumps. The jet type heat pump and the large pressure ratio vacuum pump adopt a multi-effect cascade structure which is in multi-level series-parallel connection and drives fluid to perform grading work; the structure comprises a first-level ejector, a last-level ejector and a last-level flow distributor, wherein the first-level ejector, the last-level ejector and the last-level flow distributor are in cascaded connections in turn; the first-level ejector and the last-level ejector are respectively formed by an inlet section with a nozzle, a mixed section, a throat section and a diffusion section which are connected in turn; the last-level flow distributor is provided with a last-level mixed outlet and a mixed fluid outlet; and a first-level ejecting opening of the first-level ejector is connected with the last-level mixed outlet of the diffusion section of the last-level ejector through an ejecting connecting pipe. In the jet type heat pump adopting the multi-effect cascade ejecting mode and the large pressure ratio vacuum pump, the new designed multi-effect cascade ejecting mode is adopted, so that the ejecting rate is greatly improved; the total ejecting rate is improved above 2-5 times. The multi-effect cascade ejecting mode can be used for a high-efficient large pressure ratio ejecting type heat pump and the vacuum pump.

Description

technical field [0001] The invention belongs to the technical field of industrial waste heat recovery and vacuum pumps, and in particular relates to a jet heat pump and a high pressure ratio vacuum pump adopting a multi-effect cascade injection mode. Background technique [0002] The ejector technology has a wide range of application fields, including using steam, other high-pressure gases and liquids as the driving fluid to directly inject and mix two fluids with different pressures and generate a mixed fluid of intermediate pressure for downstream process applications, using injection of low-pressure gas Various types of vacuum pumps that produce vacuum effects due to their characteristics. In thermal power plants, steam ejectors are used in thermal power plants to extract steam at medium pressure from steam turbines as the driving fluid to eject exhaust from low-pressure steam turbines and use them for heat supply. In theory, good energy-saving effects can be obtained. Th...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a jet heat pump and a high-pressure-ratio vacuum pump using a multi-stage cascade ejection method, which can greatly reduce the irreversible loss of the ejector, and achieve high-pressure-ratio Under the circumstances, the injection ratio of the low-pressure fluid is greatly increased and the pressure of the mixed fluid with the driving fluid is greatly increased, which creatively solves the low injection ratio of the jet heat pump and vacuum pump that applies the ejector technology to the condition of large pressure ratio and technical problems of high energy consumption

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