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A low-temperature air source heat pump system for supplementing air and increasing enthalpy

A technology of replenishing air to increase enthalpy and low-temperature air, applied in heat pumps, lighting and heating equipment, refrigeration components, etc., can solve problems affecting compressor operation reliability, reducing compressor reliability, and heating energy efficiency attenuation, etc., to achieve guaranteed The effect of shortening the service life, shortening the service life, and preventing deformation due to excessive center temperature

Active Publication Date: 2019-04-19
ZHEJIANG KING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing low-temperature air source heat pump gas replenishment and enthalpy increase technology is difficult to take into account the heating energy efficiency and compressor reliability under variable operating conditions. If the discharge temperature is taken as the control target, when the discharge temperature control target value is high, if the outdoor temperature is high or the supply water temperature is low, the refrigerant in the economizer of the air supplement enthalpy system will The auxiliary circuit will be closed, resulting in a decrease in the subcooling degree of the high-pressure liquid in the main circuit of the refrigerant and a decline in the heating capacity and heating energy efficiency of the unit
At the same time, when the discharge temperature control target value is low, liquid refrigerant is likely to be sprayed into the compressor's medium-pressure air supply port to dilute the frozen oil film of the scroll of the compressor, affecting the lubrication and sealing performance of the scroll, and ultimately affecting the operation reliability of the compressor.

Method used

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  • A low-temperature air source heat pump system for supplementing air and increasing enthalpy
  • A low-temperature air source heat pump system for supplementing air and increasing enthalpy
  • A low-temperature air source heat pump system for supplementing air and increasing enthalpy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: as figure 1As shown in the figure, a low-temperature air source heat pump supplemental gas enthalpy increase system includes a compressor, a condenser, a first passage 7, a second passage 8 and a third passage 9 for guiding refrigerant. The first passage 7 The inlet is communicated with the condenser, the outlet of the second passage 8 and the outlet of the third passage 9 are respectively communicated with the air supply port of the compressor; the outlet of the first passage 7 is respectively connected with the first passage 7. The inlet of the second passage 8, the inlet of the third passage 9 and the compressor are connected. The cooling equipment is communicated with the first passage 7 and the second passage 8 respectively, a part of the refrigerant in the first passage 7 flows into the compressor, and the other part of the refrigerant flows into the third passage 9, Another part of the refrigerant flows into the second passage 8; the refrigerant flowi...

Embodiment 2

[0034] Example 2: as Image 6 As shown, on the basis of Embodiment 1, the cut-off device 5 cannot completely cut off the flow of refrigerant. If necessary, a throttle solenoid valve 6 can be connected to the inlet or outlet of the cut-off device 5, and the flow capacity of the cut-off device 5 needs to be cut off. The flow solenoid valve 6 is de-energized, and the throttle solenoid valve 6 needs to be energized when the compressor air supply port is sprayed; when the exhaust gas temperature is close to the compressor's allowable operating limit, the cut-off device 5 and the throttle solenoid valve 6 are opened, and the compressor is directly connected to the compressor. The medium-pressure air supply port is used for liquid injection. On the one hand, the refrigerant can quickly and effectively cool the compression chamber to reduce the exhaust temperature. It evaporates quickly and will not dilute the compressor scroll lubrication and sealing oil film, so it can effectively i...

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Abstract

The invention discloses a low-temperature air source heat pump system for supplementing air and increasing enthalpy, comprising a compressor, a condenser, a first path for diverting refrigerant, a second path, a third path, and a refrigerant capable of vaporizing the refrigerant A subcooling device, the refrigerant subcooling device communicates with the first passage and the second passage respectively, a part of the refrigerant in the first passage flows into the compressor, and another part of the refrigerant flows into the In the third passage, part of the refrigerant flows into the second passage, and the third passage is provided with a flow breaking device that can control the opening and closing of the third passage; when the outdoor air temperature is low or the outlet water temperature is high When the exhaust temperature is high due to high temperature, the medium-pressure air supply port of the compressor can inject a sufficient amount of liquid refrigerant to quickly reduce the exhaust temperature, prevent the compressor scroll disk from being deformed due to high temperature, and the lubricating oil from deteriorating due to high temperature. Guarantee the service life of the whole machine.

Description

technical field [0001] The invention belongs to the technical field of heat pump system machinery, and in particular relates to a low-temperature air source heat pump air supplement and enthalpy increase system. Background technique [0002] At present, low-temperature air source heat pump units are more and more widely used in the coal-to-electricity transformation project of the central heating system in the north. The enthalpy value can further improve the heating energy efficiency of the unit. The compressor usually adopts the technology of increasing the enthalpy of air. Existing low-temperature air source heat pump enthalpy increase technology is difficult to take into account the heating energy efficiency and compressor reliability in variable working conditions. If the superheat degree at the outlet of the auxiliary road side of the economizer is used as the control target, the exhaust temperature will be very high when the outdoor temperature is low. If the control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B30/06F25B41/06F25B49/00F25B41/31
CPCF25B30/06F25B49/00F25B41/31
Inventor 章立标韩伟达李奉献唐进军金成召经武辉
Owner ZHEJIANG KING CO LTD