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Air source heat pump unit with parallel double compressors

An air source heat pump and dual compressor technology, applied in compressors, refrigerators, refrigeration components, etc., can solve the problems of difficult promotion, strict piping requirements, and increased costs, and achieve a simple oil return method, low cost, and simple structure. Effect

Active Publication Date: 2014-08-06
TONGFANG ARTIFICIAL ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of the above two oil return methods have some shortcomings. The first method increases the cost more, and the second method has stricter requirements on piping, which is not easy to popularize

Method used

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  • Air source heat pump unit with parallel double compressors

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Embodiment Construction

[0011] see figure 1 , the present invention includes a condenser 4, a liquid receiver 5, a dry filter 6, a thermal expansion valve 7 and an evaporator 8 connected in sequence. The suction pipe at the outlet of the evaporator 8 is respectively connected to the inlets of compressor one 1 and compressor two 2, and the total exhaust pipe at the outlet of compressor one 1 and compressor two 2 is connected to the oil separator 3, and from the oil separator 3. The separated oil is returned to the inlet of compressor 2 through oil return pipe 9. An oil equalizing pipe 10 is connected between the first compressor 1 and the second compressor 2, and the outlet of the oil separator 3 is connected to the inlet of the condenser 4 to form a circulating refrigeration system. The difference between the suction resistance of compressor 1 and the suction resistance of compressor 2 is ≥ 0.3 bar, so that there is a pressure difference in the oil tanks of the two compressors.

[0012] When the pr...

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Abstract

The invention discloses an air source heat pump unit with parallel double compressors, and relates to the technical field of air conditioners. The air source heat pump unit comprises a condenser, a liquid storage device, a drying filter, a thermal expansion valve and an evaporator which are sequentially connected. The air source heat pump unit is structurally characterized in that an air suction pipe at an outlet of the evaporator is respectively connected to an inlet of a compressor I and an inlet of a compressor II; an oil separator is connected onto a main exhaust pipe of an outlet of the compressor I and an outlet of the compressor II; oil separated from the oil separator returns to the inlet of the compressor II through an oil returning pipe; an oil equalizing pipe is connected between the compressor I and the compressor II; an outlet of the oil separator is connected to an inlet of the condenser to form a circulating refrigeration system; the difference of air suction resistance of the compressor I and air suction resistance of the compressor II is not smaller than 0.3 bar, so that pressure difference exists in oil grooves of the two compressors. According to the air source heat pump unit disclosed by the invention, normal operation of the unit is realized while oil return equalization of the two compressors is ensured. The air source heat pump unit has the characteristics of simple structure, low cost, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air source heat pump unit with two compressors connected in parallel. Background technique [0002] In the air-conditioning market, there are more and more multi-compressor parallel air-conditioning units, but this kind of unit has the problem of oil return between the compressors. Solving the normal oil return of the unit is the key to ensure the safe operation of the unit. [0003] In the prior art, the following two methods are often used: one method is to equip each compressor with a set of oil level balancer, then install an oil separator and an oil collector on the main exhaust pipe, and pass through the oil level balancer to control the amount of oil in each compressor; another way is to add a return oil separator to the suction manifold, so that all the lubricating oil returns to the upstream compressor first, and then the excess returns to the downstream comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B31/00
Inventor 刘长路韩晓明屠冰
Owner TONGFANG ARTIFICIAL ENVIRONMENT
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