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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 refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of weak defrosting ability and compressor ability, and achieve strong defrosting ability and short defrosting time , The effect of thorough defrosting

Inactive Publication Date: 2007-07-11
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

[0018] as shown in picture 2. An air-cooled heat pump high-efficiency defrosting method described in this embodiment is to control the condensing pressure during the defrosting process. The control of the condensing pressure adopts the joint action of the pressure difference control valve and the condensing pressure regulating valve. The defrosting device implemented by it It includes an air-side heat exchanger 3 and a liquid reservoir 4, a pressure control device is provided between the inlet and outlet of the air-side heat exchanger 3 and the inlet of the liquid reservoir 4, and the pressure control device includes a differential pressure controller 11 and Condensing pressure control valve 12, a differential pressure controller 11 is connected between the inlet of the air side heat exchanger 3 and the inlet of the liquid reservoir 4, and a condensing pressure controller is connected between the outlet of the air side heat exchanger 3 and the inlet of the liquid reservoir 4 C...

Embodiment 2

[0022] According to the difference in the structure and performance of the valve parts that control the condensing pressure, the air-cooled heat pump system that uses condensing pressure control can be controlled by a condensing pressure control valve alone. As shown in Figure 3, the pressure control device described in this embodiment is a condensing pressure The control valve 13 and 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 connected to the liquid reservoir 4 through the check valve 5 . It is characterized in that a single valve element, the condensing pressure control valve 13, is used to replace the differential pressure control valve 11 and the condensing pressure regulating valve 12. The condensing pressure control valve 13 only responds to changes in the outlet pressure and opens when the outlet pressure rises. In addition to c...

Embodiment 3

[0024] The defrosting method and defrosting device for an air-cooled heat pump system described in this embodiment is to provide a one-way valve on the passage between the outlet of the air-side heat exchanger 3, the condensing pressure regulating valve 12, and the inlet of the liquid reservoir 4. The valve 5 and the one-way valve 5 can be arranged at the inlet of the condensing pressure regulating valve 12 as shown in FIG. It can be located between the one-way valve 5 and the accumulator 4 , between the condensing pressure regulating valve 12 and the one-way valve 5 , or between the condensing pressure regulating valve 12 and the inlet of the liquid 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 device is generally shown in FIG. 1 . When the air-cooled heat pump unit is in heating operation, frost will gradually form on the surface of the air-side heat exchanger 3 due to the low outdoor temperature. As the frost layer thickens, the outlet air temperature and heating capacity of the internal heat exchanger 9 will gradually increase. At this time, defrosting should be carried out. 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 dense frost or ice after heating It will affect the heating effect, cause low pressure protection, the exhaust temperature is too high, and even cause co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B47/02F25B41/04
Inventor 蒋建平董志明吕久国
Owner 浙江盾安机电科技有限公司