Multi-cylinder double-level enthalpy-increasing compressor, air conditioner, heat pump water heater and control method

Abstract

The invention provides a multi-cylinder double-level enthalpy-increasing compressor which comprises a lower cover plate (10), a lower flange (9), an upper partition plate (4), a middle partition plate (5) and at least one middle cavity volume formed between every two of the lower cover plate (10), the lower flange (9), the upper partition plate (4) and the middle partition plate (5). The total middle cavity volume is the sum of all the middle cavity volumes; the specific value of the product of the total middle cavity volume or one of the middle cavity volumes in the total middle cavity volume and the volume ratio to the displacement square of a second-level cylinder is within a specified specific value range; and the air suction volume ratio is the ratio of the second-level air suction amount to the first-level air suction amount. According to the multi-cylinder double-level enthalpy-increasing compressor, the reasonable middle cavity volumes can be designed so that air suction of the second-level cylinder can be stable in a double-cylinder mode or a three-cylinder mode, a first-level cylinder can exhaust smoothly, the technical problem that the pressure of a refrigerant in the air cylinders of the double-level compressor fluctuates greatly can be effectively relieved, and therefore the operation performance of the compressor can be smooth, and noise of the compressor can be lowered. The invention further relates to an air conditioner or a heat pump water heater with the compressor and a control method.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a multi-cylinder two-stage enthalpy-increasing compressor, an air conditioner with the same, a heat pump water heater, and a control method for the compressor. Background technique [0002] With the development of science and technology, the two-stage enthalpy-increasing compressor occupies an increasingly important position in the fields of air conditioners, water heaters, refrigeration and other fields due to its high efficiency at low temperature conditions, but the existing two-stage enthalpy-increasing The compressor is basically in the form of two cylinders, and it is limited by the displacement in places with high refrigeration capacity requirements such as low temperature conditions. Therefore, the use of multi-cylinder two-stage enthalpy-increasing variable capacity compressors has become an inevitable trend. The low-pressure stage of the multi-cyli...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the two-stage compressor in the prior art that the pressure fluctuation of the refrigerant inside the cylinder is too large, which adversely affects the performance and noise of the compressor, thereby providing a Multi-cylinder two-stage enthalpy-increasing compressor, air conditioner and heat pump water heater having the same, and control method for the compressor

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