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Control method for adjusting exhaust superheat degree of air conditioner, and air conditioner

A technology of exhaust superheat and control method, which is applied in the field of exhaust superheat control of refrigeration equipment compressors, can solve the problems of compressor frequency increase, capacity decrease, and poor user comfort, and achieve the goal of avoiding changes in refrigeration capacity Effect

Active Publication Date: 2019-04-12
NINGBO AUX ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified technology can adjust the superheat of the exhaust gas, but it will affect the comfort of customers. When the exhaust temperature is too high, the frequency of the compressor will be limited, the frequency will decrease, and the capacity will decrease. When the exhaust temperature is too low, the frequency of the compressor will increase. , the capacity increases, the frequency of the compressor fluctuates, resulting in the temperature of the circulating air fluctuating, and the user's comfort is poor

Method used

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  • Control method for adjusting exhaust superheat degree of air conditioner, and air conditioner
  • Control method for adjusting exhaust superheat degree of air conditioner, and air conditioner
  • Control method for adjusting exhaust superheat degree of air conditioner, and air conditioner

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Embodiment 1

[0028] With the help of figure 1 The air conditioner system of the present invention is schematically illustrated. According to the air conditioner of the present invention, it includes a compressor 1, an evaporator 2, an electronic expansion valve 3, a condenser 4, an internal fan 5 and a control system 6. A discharge temperature sensor 12 is provided at the outlet of the compressor, a suction temperature sensor 11 is provided at the suction port of the compressor, and a pressure sensor 21 is provided on the evaporator 2 to detect the evaporation pressure, which is equal to the discharge pressure of the compressor. Pressure, a pressure sensor 41 is provided on the condenser 4 for detecting the suction pressure, a speed detector 51 is provided near the internal fan 5, and a temperature sensor 31 is provided on the side of the electronic expansion valve 3 attachment.

[0029] Example 1

[0030] figure 2 Shown is the control flowchart of the air conditioner control method of ...

Embodiment 2

[0037] In Embodiment 2 of the present invention, the control method is further optimized on the basis of Embodiment 1 above. For example, in Embodiment 1, when the rotational speed of the internal fan 5 reaches the maximum or minimum limit value, if the exhaust superheat or the suction superheat is still not The target range, the fan speed control will be invalid or continue to adjust the speed according to the above method, there may be safety hazards, such as Figure 4As shown, in the control of the speed increase of the internal fan 5, it is judged whether the speed of the internal fan 5 has reached the maximum value, and the maximum value can be a set maximum limit value. Air temperature T 排 and compressor discharge pressure P 排 Steps to perform a new round of loop control. If the rotation speed of the internal fan 5 reaches the maximum value, the electronic expansion valve 3 is controlled to reduce the opening degree, and the electronic expansion valve 3 returns to dete...

Embodiment 3

[0040] Such as figure 1 The illustrated embodiment of the present invention provides an air conditioner, including a compressor 1, an evaporator 2, an electronic expansion valve 3, a condenser 4, an internal fan 5 and a control system 6, and an exhaust port is provided at the exhaust port of the compressor. A temperature sensor 12, a suction temperature sensor 11 is set at the suction port of the compressor, and a pressure sensor 21 is set on the evaporator 2 to detect the evaporation pressure, which is equal to the discharge pressure of the compressor. 4 is provided with a pressure sensor 41 for detecting the suction pressure, a rotational speed detector 51 is provided near the internal fan 5, and a temperature sensor 31 is provided at the side of the electronic expansion valve 3 attachment. The control system 6 controls the operation of the air conditioner according to the control method of Embodiment 1 or 2.

[0041] It should be noted that the control methods of Embodimen...

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Abstract

The invention discloses a control method of an air conditioner. The control method comprises the steps that the exhaust temperature T<exhaust> and the exhaust pressure P<exhaust> of a compressor are detected, the difference between saturation temperatures Tp corresponding to the exhaust temperature T<exhaust> and the exhaust pressure P<exhaust> is calculated, and the exhaust superheat degree of the compressor is obtained; when the exhaust superheat degree is within the first preset temperature range, the rotating speed of an inner fan is controlled to keep unchanged; and when the exhaust superheat degree is not within the first preset temperature range, whether the suction superheat degree is within the second preset temperature range or not is judged, if yes, the rotating speed of the fanis controlled to keep unchanged, and if not, the rotating speed of the inner fan is adjusted. The rotating speed of the inner fan is controlled by comprehensively judging the two parameters of the exhaust superheat degree and the suction superheat degree, the blowing-out temperature is not changed due to change of the rotating speed of the inner fan, and thus the problem that in related technologies, the working frequency of the compressor is adjusted, then the refrigeration capacity of the compressor is changed, and consequently sudden changes of the temperature occur is avoided.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to a method for controlling the exhaust superheat of a refrigeration equipment compressor. Background technique [0002] Compressor discharge temperature is an important parameter in the air conditioning system, too high or too low will have a great impact. The discharge superheat refers to the temperature difference between the compressor discharge port temperature and the saturation temperature corresponding to the actual condensing pressure. If the exhaust superheat is too high, the lubricating effect of the lubricating oil will decrease, and if it is higher, it will cause the lubricating oil to carbonize, the lubricating effect will deteriorate, and the mechanical wear will be serious. When the exhaust superheat is too low, the concentration of lubricating oil will decrease, it will be difficult to return the oil, the small flow will return liquid, and wet friction will occur between ...

Claims

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Application Information

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IPC IPC(8): F24F11/32F24F11/64F24F11/77F24F11/84F25B49/02
CPCF25B49/022F25B2500/06F25B2700/1931F25B2700/1933F25B2700/21151F25B2700/21152F24F11/32F24F11/64F24F11/77F24F11/84Y02B30/70
Inventor 侯丽峰秦宪赵攀汪云强闫博
Owner NINGBO AUX ELECTRIC
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