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Defroasting method of air cooling heat pump system and its defroasting device

An air-cooled heat pump and condensing pressure technology, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of compressor capacity not being able to play, weak defrosting ability, etc., and achieve short defrosting time and strong defrosting ability , The effect of thorough defrosting

Inactive Publication Date: 2005-03-09
浙江盾安机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) For a long period of time after the start of defrosting, due to the low high and low pressure in the refrigeration system, the input power and cooling capacity of the compressor are far lower than the corresponding value of the rated refrigeration working condition, the capacity of the compressor cannot be exerted, and the defrosting capacity weak

Method used

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  • Defroasting method of air cooling heat pump system and its defroasting device
  • Defroasting method of air cooling heat pump system and its defroasting device
  • Defroasting method of air cooling heat pump system and its defroasting device

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Embodiment 1

[0019] Such as figure 2 Shown. The air-cooled heat pump high-efficiency defrosting method described in this embodiment is to control the condensing pressure during the defrosting process. The condensing pressure is controlled by the combined action of a differential pressure control valve and a condensing pressure regulating valve, and the implemented defrosting device It includes an air-side heat exchanger 3 and an accumulator 4. A pressure control device is provided between the inlet and outlet of the air-side heat exchanger 3 and the inlet of the accumulator 4. The pressure control device includes a pressure difference controller 11 and Condensing pressure control valve 12, a pressure difference controller 11 is connected between the inlet of the air-side heat exchanger 3 and the inlet of the accumulator 4, and a condensing pressure is connected between the outlet of the air-side heat exchanger 3 and the inlet of the accumulator 4 Control valve 12. Compared with the general ai...

Embodiment 2

[0023] According to the different structure and performance of the valve parts that control the condensing pressure, the air-cooled heat pump system that adopts the condensing pressure control can be controlled by the condensing pressure control valve alone, such as image 3 As shown, the pressure control device described in this embodiment is a condensing pressure control valve 13, the inlet and outlet of the air-side heat exchanger 3 are two input ports of the condensing pressure control valve 13, and the output port of the condensing pressure control valve 13 is through a single The valve 5 is connected to the accumulator 4. It is characterized by the use of a single valve condensing pressure control valve 13 instead of the differential pressure control valve 11 and the condensing pressure regulating valve 12. The condensing pressure control valve 13 only reacts to changes in outlet pressure and opens when the outlet pressure rises. In addition to controlling the outlet pressur...

Embodiment 3

[0025] The defrosting method of the air-cooled heat pump system and the defrosting device described in this embodiment is that a one-way path is provided on the outlet of the air-side heat exchanger 3, the condensing pressure regulating valve 12, and the inlet of the accumulator 4 Valve 5, check valve 5 can be as figure 2 As shown, set at the inlet of the condensing pressure regulating valve 12, it can also be as Figure 4 As shown, set at the outlet of the condensing pressure regulating valve 12, the outlet position of the differential pressure control valve 11 can be located between the one-way valve 5 and the accumulator 4, or between the condensing pressure regulating valve 12 and the one-way valve 5. It can also be located between the condensing pressure regulating valve 12 and the inlet of the accumulator 4.

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Abstract

A defrosting method for air-cooled heat pump system features that the condensing pressure is controlled by pressure difference control valve and / or condensing pressure regulating valve. Its defrosting device is composed of air heat exchanger, liquid storage unit, pressure controller, and one-way valve.

Description

Technical field [0001] The invention relates to a defrosting method for a refrigeration system, in particular to a defrosting method and a defrosting device for an air-cooled heat pump system. technical background [0002] The existing air-cooled heat pump system devices are generally as figure 1 Shown. When the air-cooled heat pump unit is in heating operation, due to the low outdoor temperature, the surface of the air-side heat exchanger 3 will gradually form frost. With the thickening of the frost layer, the air outlet temperature and heating capacity of the internal heat exchanger 9 gradually Decrease, defrost should be carried out at this time. Whether the defrosting is complete is a problem that must be paid attention to. If the defrosting is not complete, the unremoved frost layer and defrosting water will freeze into denser frost or ice after entering the heating, and it will be difficult to defrost again next time. Otherwise, the heating effect will be affected, low pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02
Inventor 蒋建平董志明吕久国
Owner 浙江盾安机电科技有限公司
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