CN107178944B - method for preventing exhaust superheat degree of air conditioner from being too small and air conditioner control system - Google Patents

method for preventing exhaust superheat degree of air conditioner from being too small and air conditioner control system Download PDF

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Publication number
CN107178944B
CN107178944B CN201710571445.9A CN201710571445A CN107178944B CN 107178944 B CN107178944 B CN 107178944B CN 201710571445 A CN201710571445 A CN 201710571445A CN 107178944 B CN107178944 B CN 107178944B
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China
Prior art keywords
air conditioner
compressor
exhaust
temperature
superheat degree
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CN201710571445.9A
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CN107178944A (en
Inventor
武智良则
柯一龙
许双
久保和也
卢云
永井宏典
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Shanghai Mitsubishi Electric Machinery Shanghai Mitsubishi Air Conditioner Electrical Co Ltd
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Shanghai Mitsubishi Electric Machinery Shanghai Mitsubishi Air Conditioner Electrical Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19Pressures
    • F25B2700/193Pressures of the compressor
    • F25B2700/1931Discharge pressures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2115Temperatures of a compressor or the drive means therefor
    • F25B2700/21152Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

the invention discloses a method for preventing the exhaust superheat degree of an air conditioner from being too small, which comprises the following steps: s1, detecting the exhaust temperature of a compressor of the air conditioner, and detecting the temperature of a heat exchanger pipeline of the air conditioner or the exhaust pressure of the compressor; s2, calculating the difference between the compressor discharge temperature and the heat exchanger pipeline temperature or calculating the difference between the compressor discharge temperature and the saturation temperature corresponding to the compressor discharge pressure to obtain the discharge superheat degree SHd of the air conditioner; s3, judging whether the exhaust superheat degree SHd is smaller than a preset exhaust superheat degree minimum threshold value SHdl, if so, executing a step S4, and if not, jumping to the step S5; s4, increasing the minimum frequency MinHz of the allowed operation of the compressor; s5, judging whether the exhaust superheat degree SHd is larger than a preset exhaust superheat degree maximum threshold value SHdh, if so, executing a step S6, otherwise, returning to execute the step S1 to continue the next round of circulation detection; s6, reducing the minimum frequency MinHz of the allowed operation of the compressor, and returning to execute the step S1 to continue the next cycle detection.

Description

method for preventing exhaust superheat degree of air conditioner from being too small and air conditioner control system
Technical Field
The invention relates to the technical field of air conditioners and refrigeration engineering, in particular to a method for preventing exhaust superheat degree of an air conditioner from being too small and an air conditioner control system.
background
When the exhaust heat of the compressor of the air conditioner is too small, the phenomena of poor oil return, liquid impact and the like of the compressor generally occur, so that the reliability of the compressor is influenced; in particular, in the case of the rotor compressor, abnormal sound such as metal impact sound occurs together with the occurrence of the liquid impact phenomenon.
In order to solve the above problems, a general solution is to increase the degree of superheat of the exhaust gas by reducing the opening degree of the electronic expansion valve, but when the actual operating frequency of the compressor is low, it is difficult to increase the degree of superheat of the exhaust gas even if the opening degree of the electronic expansion valve is reduced, and in this case, reducing the opening degree may cause a phenomenon such as an excessively small refrigerant circulation flow rate and an excessively dry evaporator, which is disadvantageous to the performance of the air conditioner.
disclosure of Invention
the invention aims to provide a method for preventing the exhaust superheat degree of an air conditioner from being too small and an air conditioner control system, which effectively solve the problem that the exhaust superheat degree is difficult to improve by reducing the opening degree of an electronic expansion valve when the exhaust superheat degree is too small, and simultaneously solve the problems of reliability and abnormal sound of a compressor caused by the too small exhaust superheat degree.
In order to achieve the purpose, the invention is realized by the following technical scheme:
A method for preventing the exhaust superheat degree of an air conditioner from being too small is characterized by comprising the following steps:
S1, detecting the exhaust temperature of a compressor of the air conditioner, and detecting the temperature of a heat exchanger pipeline of the air conditioner or the exhaust pressure of the compressor;
S2, calculating the difference between the compressor discharge temperature and the heat exchanger pipeline temperature or calculating the difference between the compressor discharge temperature and the saturation temperature corresponding to the compressor discharge pressure to obtain the discharge superheat degree SHd of the air conditioner;
s3, judging whether the exhaust superheat degree SHd is smaller than a preset exhaust superheat degree minimum threshold value SHdl, if so, executing a step S4, and if not, jumping to the step S5;
s4, increasing the minimum frequency MinHz of the allowed operation of the compressor;
s5, judging whether the exhaust superheat degree SHd is larger than a preset exhaust superheat degree maximum threshold value SHdh, if so, executing a step S6, otherwise, returning to execute the step S1 to continue the next round of circulation detection;
s6, reducing the minimum frequency MinHz of the allowed operation of the compressor, and returning to execute the step S1 to continue the next cycle detection.
The above method for preventing the overheating degree of the air conditioner exhaust from being too small, wherein in the step S1:
the air conditioner comprises an air conditioner body, a first temperature sensing bulb and a second temperature sensing bulb, wherein the first temperature sensing bulb is used for detecting the exhaust temperature of a compressor of the air conditioner, and is arranged on an exhaust pipe of the compressor or a shell of the compressor.
in the above method for preventing the exhaust superheat of the air conditioner from being too small, in step S1, the method for detecting the heat exchanger duct temperature of the air conditioner is as follows:
detecting the temperature of an indoor heat exchanger pipeline of the air conditioner through a second temperature sensing bulb or detecting the temperature of an outdoor heat exchanger pipeline of the air conditioner through a third temperature sensing bulb;
the second temperature sensing bulb is arranged on an indoor heat exchanger pipeline of the air conditioner, and the third temperature sensing bulb is arranged on an outdoor heat exchanger pipeline of the air conditioner.
in the above method for preventing the overheat of the air conditioner exhaust air from being too small, in step S1, the method for detecting the compressor exhaust pressure of the air conditioner includes:
And detecting the exhaust pressure of the compressor of the air conditioner through a pressure sensor, wherein the pressure sensor is arranged on the exhaust port or the exhaust pipe of the compressor.
in the above method for preventing the exhaust superheat of the air conditioner from being too small, in step S1:
when the operation mode of the air conditioner is a cooling mode, the pipeline temperature of an outdoor heat exchanger of the air conditioner is detected, and when the operation mode of the air conditioner is a heating mode, the pipeline temperature of an indoor heat exchanger of the air conditioner is detected.
The above method for preventing the exhaust superheat of the air conditioner from being too small, wherein:
The SHdl is less than or equal to SHdh.
the above method for preventing the overheating degree of the air conditioner exhaust from being too small, wherein in the step S6:
the minimum frequency at which the reduced compressor is allowed to operate is not less than the minimum frequency at which the initial compressor is allowed to operate.
An air conditioner control system for preventing an air conditioner from being excessively overheated, comprising:
An air conditioner;
the first detection unit is used for detecting the exhaust temperature of a compressor of the air conditioner;
the air conditioner comprises a first detection unit and/or a second detection unit, wherein the first detection unit is used for detecting the temperature of a heat exchanger pipeline of the air conditioner, and the second detection unit is used for detecting the pressure of the air discharged by a compressor of the air conditioner;
The heat degree calculation module is used for calculating the exhaust superheat degree SHd of the air conditioner according to the difference between the compressor exhaust temperature and the heat exchanger pipeline temperature or the difference between the compressor exhaust temperature and the saturation temperature corresponding to the compressor exhaust pressure;
the comparison module is connected with the heat degree calculation module and used for comparing the exhaust superheat degree SHd with a preset exhaust superheat degree minimum threshold value SHdl and an exhaust superheat degree maximum threshold value SHdh to obtain a comparison result of whether the exhaust superheat degree SHd is smaller than the preset exhaust superheat degree minimum threshold value SHdl and whether the exhaust superheat degree SHd is larger than the preset exhaust superheat degree maximum threshold value SHdh;
the frequency range control module is connected with the compressor and the comparison module; when the exhaust superheat SHd is smaller than a preset exhaust superheat minimum threshold SHdl, the frequency range control module increases the minimum frequency MinHz of the allowed operation of the compressor; when the exhaust superheat SHd is greater than a preset exhaust superheat maximum threshold SHdh, the frequency range control module decreases the minimum frequency MinHz at which the compressor is allowed to operate.
the air conditioner control system for preventing the exhaust superheat degree of the air conditioner from being too small as described above further includes:
The operation mode detection module is connected with the air conditioner and used for detecting the operation mode of the air conditioner; when the operation mode of the air conditioner is a cooling mode, the pipeline temperature of an outdoor heat exchanger of the air conditioner is detected, and when the operation mode of the air conditioner is a heating mode, the pipeline temperature of an indoor heat exchanger of the air conditioner is detected.
the above-mentioned air conditioner control system that prevents that the exhaust superheat of air conditioner is too little, wherein:
the first detection unit is a first temperature sensing bulb arranged on an exhaust pipe of a compressor of the air conditioner or a shell of the compressor;
the second detection unit comprises a second temperature sensing bulb for detecting the temperature of the indoor heat exchanger pipeline of the air conditioner and a third temperature sensing bulb for detecting the temperature of the outdoor heat exchanger pipeline of the air conditioner;
The third detection unit is a pressure sensor arranged on the air outlet or the exhaust pipe of the compressor of the air conditioner.
Compared with the prior art, the invention has the following advantages: when the running frequency of the compressor is smaller, if the exhaust superheat degree is smaller, the minimum frequency of the allowed running of the compressor is improved, so that the condition that the compressor always runs at a smaller frequency is avoided, the exhaust superheat degree of the air conditioner is improved, the defect that the exhaust superheat degree is difficult to improve when the opening degree of the electronic expansion valve is reduced is overcome, the problems of reliability, abnormal sound and the like of the compressor caused by the fact that the exhaust superheat degree is too small are solved, and after the exhaust superheat degree meets the requirement, the frequency range of the allowed running of the compressor can be recovered by reducing the minimum frequency of the allowed running of the compressor.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a system configuration diagram in an embodiment of the present invention.
Detailed Description
the present invention will now be further described by way of the following detailed description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings.
as shown in fig. 1, the present invention provides a method for preventing overheating of air conditioner exhaust air from being too small, comprising the following steps:
S1, detecting the exhaust temperature of a compressor 5 of the air conditioner, and detecting the temperature of a heat exchanger pipeline of the air conditioner or the exhaust pressure of the compressor 5;
s2, calculating the difference between the discharge temperature of the compressor 5 and the temperature of the heat exchanger pipeline or calculating the difference between the discharge temperature of the compressor and the saturation temperature corresponding to the discharge pressure of the compressor 5 to obtain the discharge superheat degree SHd of the air conditioner;
S3, judging whether the exhaust superheat degree SHd is smaller than a preset exhaust superheat degree minimum threshold value SHdl, if so, executing a step S4, and if not, jumping to the step S5;
s4, increasing the minimum frequency MinHz of the allowed operation of the compressor 5;
S5, judging whether the exhaust superheat SHd is larger than a preset exhaust superheat maximum threshold value SHdh, if so, executing a step S6, otherwise, returning to execute the step S1 to continue the next round of cycle detection;
s6, the minimum frequency MinHz of the allowed operation of the compressor 5 is reduced, and the step S1 is returned to continue the next cycle detection. And the minimum frequency at which the reduced compressor 5 is allowed to operate is not less than the minimum frequency at which the original compressor 5 is allowed to operate.
it should be noted that the minimum frequency increasing and decreasing values and the time interval between two detections are set according to specific requirements of different types of air conditioners, wherein the increasing frequency may be equal to the decreasing frequency, but preferably, the air conditioner operates more stably when the increasing frequency is greater than the decreasing frequency. By adopting the method for preventing the exhaust superheat degree from being too small, the problem that the exhaust superheat degree is sometimes difficult to improve by reducing the opening degree of the electronic expansion valve when the frequency of the compressor is low can be solved, meanwhile, the problems of reliability and abnormal sound of the compressor caused by too low exhaust superheat degree are solved, and after the exhaust superheat degree meets the requirement, the frequency range of the allowable operation of the compressor can be recovered by reducing the minimum frequency of the allowable operation of the compressor.
In this embodiment, the discharge temperature of the compressor 5 of the air conditioner is detected by a first detecting unit, wherein the first detecting unit may be a first thermal bulb 9 disposed on the discharge pipe of the compressor 5 or the shell of the compressor 5.
in this embodiment, the heat exchanger pipe temperature of the air conditioner is detected by a second detection unit, wherein the second detection unit may include a second thermal bulb 7 for detecting the pipe temperature of the indoor heat exchanger 1 of the air conditioner and/or a third thermal bulb 8 for detecting the pipe temperature of the outdoor heat exchanger 2 of the air conditioner. Preferably, the second bulb 7 and the third bulb 8 are provided at the same time.
in this embodiment, the discharge pressure of the compressor 5 of the air conditioner is detected by a third detecting unit, wherein the third detecting unit may be a pressure sensor 6 disposed at the discharge port or the exhaust pipe of the compressor 5 of the air conditioner.
in this embodiment, in step S1: when the operation mode of the air conditioner is a cooling mode, the pipeline temperature of the outdoor heat exchanger 2 of the air conditioner is detected, and when the operation mode of the air conditioner is a heating mode, the pipeline temperature of the indoor heat exchanger 1 of the air conditioner is detected.
as shown in fig. 2, an air conditioner control system for preventing overheating of air conditioner exhaust air is provided, which includes:
an air conditioner, generally including an electronic expansion valve 3, a four-way valve 4, a compressor 5, an indoor heat exchanger 1, and an outdoor heat exchanger 2;
a first detection unit for detecting the discharge temperature of the compressor 5 of the air conditioner;
the air conditioner comprises a first detection unit and/or a second detection unit, wherein the first detection unit is used for detecting the temperature of a heat exchanger pipeline of the air conditioner, and the second detection unit is used for detecting the pressure of the air discharged by a compressor of the air conditioner;
The heat degree calculation module is used for calculating the exhaust superheat SHd of the air conditioner according to the difference between the exhaust temperature of the compressor 5 and the temperature of the heat exchanger pipeline or the difference between the exhaust temperature of the compressor 5 and the saturation temperature corresponding to the exhaust pressure of the compressor 5;
the comparison module is connected with the heat degree calculation module and used for comparing the exhaust superheat degree SHd with a preset exhaust superheat degree minimum threshold value SHdl and an exhaust superheat degree maximum threshold value SHdh to obtain a comparison result of whether the exhaust superheat degree SHd is smaller than the preset exhaust superheat degree minimum threshold value SHdl and whether the exhaust superheat degree SHd is larger than the preset exhaust superheat degree maximum threshold value SHdh;
the frequency range control module is connected with the compressor 5 and the comparison module; when the exhaust superheat SHd is smaller than a preset exhaust superheat minimum threshold SHdl, the frequency range control module increases the minimum frequency MinHz of the allowed operation of the compressor; when the exhaust superheat SHd is larger than a preset exhaust superheat maximum threshold SHdh, the frequency range control module reduces the minimum frequency MinHz of the allowed operation of the compressor;
the operation mode detection module is connected with the air conditioner and used for detecting the operation mode of the air conditioner; when the operation mode of the air conditioner is a cooling mode, the pipeline temperature of the outdoor heat exchanger 2 of the air conditioner is detected, and when the operation mode of the air conditioner is a heating mode, the pipeline temperature of the indoor heat exchanger 1 of the air conditioner is detected.
in this embodiment, each module is disposed on the control substrate.
while the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (10)

1. A method for preventing the exhaust superheat degree of an air conditioner from being too small is characterized by comprising the following steps:
S1, detecting the exhaust temperature of a compressor of the air conditioner, and detecting the temperature of a heat exchanger pipeline of the air conditioner or the exhaust pressure of the compressor;
S2, calculating the difference between the compressor discharge temperature and the heat exchanger pipeline temperature or calculating the difference between the compressor discharge temperature and the saturation temperature corresponding to the compressor discharge pressure to obtain the discharge superheat degree SHd of the air conditioner;
s3, judging whether the exhaust superheat degree SHd is smaller than a preset exhaust superheat degree minimum threshold value SHdl, if so, executing a step S4, and if not, jumping to the step S5;
S4, increasing the minimum frequency MinHz of the allowed operation of the compressor;
S5, judging whether the exhaust superheat degree SHd is larger than a preset exhaust superheat degree maximum threshold value SHdh, if so, executing a step S6, otherwise, returning to execute the step S1 to continue the next round of circulation detection;
S6, reducing the minimum frequency MinHz of the allowed operation of the compressor, and returning to execute the step S1 to continue the next cycle detection.
2. The method for preventing the overheat of the air-conditioner exhaust air according to claim 1, wherein in said step S1:
the air conditioner comprises an air conditioner body, a first temperature sensing bulb and a second temperature sensing bulb, wherein the first temperature sensing bulb is used for detecting the exhaust temperature of a compressor of the air conditioner, and is arranged on an exhaust pipe of the compressor or a shell of the compressor.
3. The method for preventing the exhaust air of the air conditioner from being excessively overheated according to claim 1, wherein the step S1 of detecting the heat exchanger tube temperature of the air conditioner is performed by:
Detecting the temperature of an indoor heat exchanger pipeline of the air conditioner through a second temperature sensing bulb or detecting the temperature of an outdoor heat exchanger pipeline of the air conditioner through a third temperature sensing bulb;
The second temperature sensing bulb is arranged on an indoor heat exchanger pipeline of the air conditioner, and the third temperature sensing bulb is arranged on an outdoor heat exchanger pipeline of the air conditioner.
4. the method for preventing the overheat of the air-conditioner discharge as set forth in claim 1 or 3, wherein the manner of detecting the compressor discharge pressure of the air-conditioner in the step S1 is:
And detecting the exhaust pressure of the compressor of the air conditioner through a pressure sensor, wherein the pressure sensor is arranged on the exhaust port or the exhaust pipe of the compressor.
5. The method for preventing the exhaust air of the air conditioner from being excessively overheated as set forth in claim 1 or 3, wherein the step S1 is:
When the operation mode of the air conditioner is a cooling mode, the pipeline temperature of an outdoor heat exchanger of the air conditioner is detected, and when the operation mode of the air conditioner is a heating mode, the pipeline temperature of an indoor heat exchanger of the air conditioner is detected.
6. The method for preventing the exhaust air of the air conditioner from being excessively overheated as set forth in claim 1, wherein:
The SHdl is less than or equal to SHdh.
7. the method for preventing the overheat of the air-conditioner exhaust air according to claim 1, wherein in said step S6:
The minimum frequency at which the reduced compressor is allowed to operate is not less than the minimum frequency at which the initial compressor is allowed to operate.
8. an air conditioner control system for preventing overheating of an air conditioner exhaust air from being excessively small, comprising:
an air conditioner;
the first detection unit is used for detecting the exhaust temperature of a compressor of the air conditioner;
the air conditioner comprises a first detection unit and/or a second detection unit, wherein the first detection unit is used for detecting the temperature of a heat exchanger pipeline of the air conditioner, and the second detection unit is used for detecting the pressure of the air discharged by a compressor of the air conditioner;
The heat degree calculation module is used for calculating the exhaust superheat degree SHd of the air conditioner according to the difference between the compressor exhaust temperature and the heat exchanger pipeline temperature or the difference between the compressor exhaust temperature and the saturation temperature corresponding to the compressor exhaust pressure;
the comparison module is connected with the heat degree calculation module and used for comparing the exhaust superheat degree SHd with a preset exhaust superheat degree minimum threshold value SHdl and an exhaust superheat degree maximum threshold value SHdh to obtain a comparison result of whether the exhaust superheat degree SHd is smaller than the preset exhaust superheat degree minimum threshold value SHdl and whether the exhaust superheat degree SHd is larger than the preset exhaust superheat degree maximum threshold value SHdh;
the frequency range control module is connected with the compressor and the comparison module; when the exhaust superheat SHd is smaller than a preset exhaust superheat minimum threshold SHdl, the frequency range control module increases the minimum frequency MinHz of the allowed operation of the compressor; when the exhaust superheat SHd is greater than a preset exhaust superheat maximum threshold SHdh, the frequency range control module decreases the minimum frequency MinHz at which the compressor is allowed to operate.
9. an air conditioner control system for preventing overheating of an air conditioner discharge air according to claim 8, further comprising:
The operation mode detection module is connected with the air conditioner and used for detecting the operation mode of the air conditioner; when the operation mode of the air conditioner is a cooling mode, the pipeline temperature of an outdoor heat exchanger of the air conditioner is detected, and when the operation mode of the air conditioner is a heating mode, the pipeline temperature of an indoor heat exchanger of the air conditioner is detected.
10. an air conditioner control system for preventing overheat of air conditioner exhaust according to claim 8 or 9, wherein:
the first detection unit is a first temperature sensing bulb arranged on an exhaust pipe of a compressor of the air conditioner or a shell of the compressor;
The second detection unit comprises a second temperature sensing bulb for detecting the temperature of the indoor heat exchanger pipeline of the air conditioner and a third temperature sensing bulb for detecting the temperature of the outdoor heat exchanger pipeline of the air conditioner;
the third detection unit is a pressure sensor arranged on the air outlet or the exhaust pipe of the compressor of the air conditioner.
CN201710571445.9A 2017-07-13 2017-07-13 method for preventing exhaust superheat degree of air conditioner from being too small and air conditioner control system Active CN107178944B (en)

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CN108168146A (en) * 2018-02-02 2018-06-15 韩军 A kind of refrigeration and discharge superheat control method in heat pump unit
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