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Air-conditioner and control method thereof

A technology for air conditioners and heaters, which is applied in the field of improvement, can solve the problems of reducing the size of the air conditioner, the inability to modify the air conditioner, and the reduction of system reliability, so as to prevent the suction pressure from being too low, the modification process is simple and easy, and the improvement The effect of operational reliability

Active Publication Date: 2012-05-02
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 2. When the air conditioner is heating and defrosting, the suction pressure is too low, which will cause the defrosting time to be prolonged
[0017] 4. During the defrosting process of the air conditioner, the reliability of the system operation decreases
However, the disadvantages of this technical solution are: 1. Due to the addition of the first and second bypass circuits in the system, in the parallel connection and refrigeration cycle system, electronic expansion valves, auxiliary refrigerant throttling mechanisms such as electromagnetic valves must be configured , which makes the control of the whole system complex, difficult to control the switching of working modes, and prone to failure of the whole machine caused by a single valve failure, resulting in a decrease in the reliability of the whole system
2. Due to the configuration of multiple components, the cost of the whole machine increases
3. The refrigerant heater is an electric heater and is exposed, which is poor in safety
4. Since the bypass circuit must be configured, the existing air conditioner cannot be modified
5. This technical solution is only effective during defrosting, and the heat generated by the indoor mechanism is very small during defrosting; if it is turned on during heating operation, it will cause the evaporation temperature to rise, reduce the heat transfer temperature difference on the evaporation side, and reduce the air conditioning The heat absorbed by the air conditioner from the outside will eventually lead to a decrease in the heating capacity of the air conditioner
Due to the above reasons, this technical solution has not formed an actual product so far and has not been implemented.

Method used

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  • Air-conditioner and control method thereof
  • Air-conditioner and control method thereof
  • Air-conditioner and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] see figure 1 and figure 2 , The refrigerant heater 7 is arranged on the E pipe section 2-1 of the four-way valve 5. see Figure 5 and Figure 6 , the refrigerant heater 7 includes a fixed frame 7-1 and a heating element 7-2. The heating element 7-2 is installed in the fixed frame 7-1, and the heating element 7-2 of the refrigerant heater 7 For PTC heater.

[0058] As far as the specific technical solution is concerned, the fixed frame 7 is composed of two symmetrically assembled semi-fixed frames, the inner surface of each semi-fixed frame is a semicircle, and the PTC heater 7-2 is installed in the groove of each described semi-fixed frame . The two semi-fixed frames are symmetrically assembled on the E pipeline section 2-1 of the four-way valve 2, and the two semi-fixed frames can be fixed by screws, clamped by pipe clamps, or other fixed structures. In this embodiment, the fixing frame 7-1 is made of aluminum alloy. PTC heater 7-2 is all housed in the groove o...

Embodiment 2

[0060] The difference from Embodiment 1 is that the refrigerant heater 7 can be installed on the refrigerant pipeline section between the four-way valve 2 and the air pipe stop valve 8, and the refrigerant heater 7 can be installed somewhere in this pipeline. Air pipe cut-off valve 8 is also called large cut-off valve in the air-conditioning industry, and liquid pipe stop valve 9 is also called small cut-off valve in the air-conditioning industry.

[0061] A. Heating operation

[0062] see figure 1 , when the air conditioner is in heating operation, if the exhaust gas temperature (feedback from the exhaust temperature sensor) is low, the refrigerant heater 7 can be turned on, such as image 3 Shown: The refrigerant state is in the pressure enthalpy image 3 The above expression is as follows, during heating operation, if the refrigerant heater 7 is not turned on, its state sequence is 1→2→3→4→1, and if the refrigerant heater 7 is turned on, its state sequence is 1→2→2'→3 → ...

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Abstract

The invention provides an air-conditioner and a control method of the air-conditioner. By means of the air-conditioner, heating capacity of low-temperature heating and outdoor frosting state of the air-conditioner can be improved and defrosting time can be shortened, therefore, indoor room temperature fluctuation can be decreased when the air-conditioner is defrosted, operating reliability of a compressor can be improved when the air-conditioner is defrosted, cost is reduced, and the conventional air-conditioner can be refitted. The invention has the technical scheme that: the air-conditioner is provided with a refrigerant circulating system, wherein the refrigerant circulating system comprises the compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a refrigerant pipeline and a refrigerant heater, and the refrigerant heater is arranged on a section of an E pipe of the four-way valve. The refrigerant heater in the invention is directly installed on the section of the E pipe of the four-way valve or a section of a refrigerant pipe between the four-way valve and a wind pipe stop valve, and components with mutually interferential control modes are reduced by the refrigerant heater. The system control is reliable, mutually interferential phenomenon is avoided, operating reliability of the whole air-conditioner is improved, the structure is simple and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of air conditioning and refrigeration, and in particular relates to improvements in low-temperature heating and defrosting of an air conditioner. Background technique [0002] Existing air conditioners have the following problems in terms of low-temperature heating and defrosting. [0003] 1. When the existing air conditioner operates at a lower outdoor temperature, the heating capacity will attenuate. Because when the outdoor temperature is low, the evaporating temperature will decrease, which will increase the specific volume of the refrigerant at the suction point of the compressor, resulting in a decrease in the flow rate of the refrigerant, so the heating capacity will decrease. [0004] In order to solve the problem of attenuation of low-temperature heating capacity, the existing methods to solve low-temperature heating capacity are as follows: [0005] 1. Install auxiliary electric heater indoors ...

Claims

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Application Information

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IPC IPC(8): F24F1/00F24F13/00F25B47/00F24F11/00
Inventor 宫天泽郑学利王志刚
Owner HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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